blob: 6801c68ee7dadfeaf414fea599e41b0466ce3f11 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Borislav Petkov5ce78af2008-02-02 19:56:48 +01002 * IDE ATAPI streaming tape driver.
3 *
Bartlomiej Zolnierkiewicz59bca8c2008-02-01 23:09:33 +01004 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * This driver was constructed as a student project in the software laboratory
8 * of the faculty of electrical engineering in the Technion - Israel's
9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
10 *
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Borislav Petkov5ce78af2008-02-02 19:56:48 +010014 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 */
17
Borislav Petkovdfe799362008-02-06 02:57:55 +010018#define IDETAPE_VERSION "1.20"
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/string.h>
23#include <linux/kernel.h>
24#include <linux/delay.h>
25#include <linux/timer.h>
26#include <linux/mm.h>
27#include <linux/interrupt.h>
Marcelo Feitoza Parisi9bae1ff2006-03-28 01:56:46 -080028#include <linux/jiffies.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/major.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/errno.h>
31#include <linux/genhd.h>
32#include <linux/slab.h>
33#include <linux/pci.h>
34#include <linux/ide.h>
35#include <linux/smp_lock.h>
36#include <linux/completion.h>
37#include <linux/bitops.h>
Arjan van de Vencf8b8972006-03-23 03:00:45 -080038#include <linux/mutex.h>
Borislav Petkov90699ce2008-02-02 19:56:50 +010039#include <scsi/scsi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#include <asm/byteorder.h>
Borislav Petkovc837cfa2008-02-06 02:57:54 +010042#include <linux/irq.h>
43#include <linux/uaccess.h>
44#include <linux/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <linux/mtio.h>
47
Borislav Petkov8004a8c2008-02-06 02:57:51 +010048enum {
49 /* output errors only */
50 DBG_ERR = (1 << 0),
51 /* output all sense key/asc */
52 DBG_SENSE = (1 << 1),
53 /* info regarding all chrdev-related procedures */
54 DBG_CHRDEV = (1 << 2),
55 /* all remaining procedures */
56 DBG_PROCS = (1 << 3),
57 /* buffer alloc info (pc_stack & rq_stack) */
58 DBG_PCRQ_STACK = (1 << 4),
59};
60
61/* define to see debug info */
62#define IDETAPE_DEBUG_LOG 0
63
64#if IDETAPE_DEBUG_LOG
65#define debug_log(lvl, fmt, args...) \
66{ \
67 if (tape->debug_mask & lvl) \
68 printk(KERN_INFO "ide-tape: " fmt, ## args); \
69}
70#else
71#define debug_log(lvl, fmt, args...) do {} while (0)
72#endif
73
Linus Torvalds1da177e2005-04-16 15:20:36 -070074/**************************** Tunable parameters *****************************/
Linus Torvalds1da177e2005-04-16 15:20:36 -070075/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +010076 * After each failed packet command we issue a request sense command and retry
77 * the packet command IDETAPE_MAX_PC_RETRIES times.
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +010079 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 */
81#define IDETAPE_MAX_PC_RETRIES 3
82
83/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +010084 * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE
85 * bytes. This is used for several packet commands (Not for READ/WRITE commands)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 */
87#define IDETAPE_PC_BUFFER_SIZE 256
88
89/*
90 * In various places in the driver, we need to allocate storage
91 * for packet commands and requests, which will remain valid while
92 * we leave the driver to wait for an interrupt or a timeout event.
93 */
94#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
95
96/*
97 * Some drives (for example, Seagate STT3401A Travan) require a very long
98 * timeout, because they don't return an interrupt or clear their busy bit
99 * until after the command completes (even retension commands).
100 */
101#define IDETAPE_WAIT_CMD (900*HZ)
102
103/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100104 * The following parameter is used to select the point in the internal tape fifo
105 * in which we will start to refill the buffer. Decreasing the following
106 * parameter will improve the system's latency and interactive response, while
107 * using a high value might improve system throughput.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 */
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100109#define IDETAPE_FIFO_THRESHOLD 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100112 * DSC polling parameters.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100114 * Polling for DSC (a single bit in the status register) is a very important
115 * function in ide-tape. There are two cases in which we poll for DSC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100117 * 1. Before a read/write packet command, to ensure that we can transfer data
118 * from/to the tape's data buffers, without causing an actual media access.
119 * In case the tape is not ready yet, we take out our request from the device
120 * request queue, so that ide.c could service requests from the other device
121 * on the same interface in the meantime.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100123 * 2. After the successful initialization of a "media access packet command",
124 * which is a command that can take a long time to complete (the interval can
125 * range from several seconds to even an hour). Again, we postpone our request
126 * in the middle to free the bus for the other device. The polling frequency
127 * here should be lower than the read/write frequency since those media access
128 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
129 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
130 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100132 * We also set a timeout for the timer, in case something goes wrong. The
133 * timeout should be longer then the maximum execution time of a tape operation.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 */
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100135
136/* DSC timings. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
138#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
139#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
140#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
141#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
142#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
143#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
144
145/*************************** End of tunable parameters ***********************/
146
Borislav Petkov54abf372008-02-06 02:57:52 +0100147/* tape directions */
148enum {
149 IDETAPE_DIR_NONE = (1 << 0),
150 IDETAPE_DIR_READ = (1 << 1),
151 IDETAPE_DIR_WRITE = (1 << 2),
152};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154struct idetape_bh {
Stephen Rothwellab057962007-08-01 23:46:44 +0200155 u32 b_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 atomic_t b_count;
157 struct idetape_bh *b_reqnext;
158 char *b_data;
159};
160
Borislav Petkov03056b92008-04-18 00:46:26 +0200161/* Tape door status */
162#define DOOR_UNLOCKED 0
163#define DOOR_LOCKED 1
164#define DOOR_EXPLICITLY_LOCKED 2
165
166/* Some defines for the SPACE command */
167#define IDETAPE_SPACE_OVER_FILEMARK 1
168#define IDETAPE_SPACE_TO_EOD 3
169
170/* Some defines for the LOAD UNLOAD command */
171#define IDETAPE_LU_LOAD_MASK 1
172#define IDETAPE_LU_RETENSION_MASK 2
173#define IDETAPE_LU_EOT_MASK 4
174
175/*
176 * Special requests for our block device strategy routine.
177 *
178 * In order to service a character device command, we add special requests to
179 * the tail of our block device request queue and wait for their completion.
180 */
181
182enum {
183 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
184 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
185 REQ_IDETAPE_READ = (1 << 2),
186 REQ_IDETAPE_WRITE = (1 << 3),
187};
188
189/* Error codes returned in rq->errors to the higher part of the driver. */
190#define IDETAPE_ERROR_GENERAL 101
191#define IDETAPE_ERROR_FILEMARK 102
192#define IDETAPE_ERROR_EOD 103
193
194/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
195#define IDETAPE_BLOCK_DESCRIPTOR 0
196#define IDETAPE_CAPABILITIES_PAGE 0x2a
197
Borislav Petkov346331f2008-04-18 00:46:26 +0200198/* Tape flag bits values. */
199enum {
200 IDETAPE_FLAG_IGNORE_DSC = (1 << 0),
201 /* 0 When the tape position is unknown */
202 IDETAPE_FLAG_ADDRESS_VALID = (1 << 1),
203 /* Device already opened */
Borislav Petkov42d54682008-04-27 15:38:27 +0200204 IDETAPE_FLAG_BUSY = (1 << 2),
Borislav Petkov346331f2008-04-18 00:46:26 +0200205 /* Attempt to auto-detect the current user block size */
Borislav Petkov42d54682008-04-27 15:38:27 +0200206 IDETAPE_FLAG_DETECT_BS = (1 << 3),
Borislav Petkov346331f2008-04-18 00:46:26 +0200207 /* Currently on a filemark */
Borislav Petkov42d54682008-04-27 15:38:27 +0200208 IDETAPE_FLAG_FILEMARK = (1 << 4),
Borislav Petkov346331f2008-04-18 00:46:26 +0200209 /* DRQ interrupt device */
Borislav Petkov42d54682008-04-27 15:38:27 +0200210 IDETAPE_FLAG_DRQ_INTERRUPT = (1 << 5),
Borislav Petkov346331f2008-04-18 00:46:26 +0200211 /* 0 = no tape is loaded, so we don't rewind after ejecting */
Borislav Petkov42d54682008-04-27 15:38:27 +0200212 IDETAPE_FLAG_MEDIUM_PRESENT = (1 << 6),
Borislav Petkov346331f2008-04-18 00:46:26 +0200213};
214
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100216 * Most of our global data which we need to save even as we leave the driver due
217 * to an interrupt or a timer event is stored in the struct defined below.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 */
219typedef struct ide_tape_obj {
220 ide_drive_t *drive;
221 ide_driver_t *driver;
222 struct gendisk *disk;
223 struct kref kref;
224
225 /*
226 * Since a typical character device operation requires more
227 * than one packet command, we provide here enough memory
228 * for the maximum of interconnected packet commands.
229 * The packet commands are stored in the circular array pc_stack.
230 * pc_stack_index points to the last used entry, and warps around
231 * to the start when we get to the last array entry.
232 *
233 * pc points to the current processed packet command.
234 *
235 * failed_pc points to the last failed packet command, or contains
236 * NULL if we do not need to retry any packet command. This is
237 * required since an additional packet command is needed before the
238 * retry, to get detailed information on what went wrong.
239 */
240 /* Current packet command */
Borislav Petkovd236d742008-04-18 00:46:27 +0200241 struct ide_atapi_pc *pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 /* Last failed packet command */
Borislav Petkovd236d742008-04-18 00:46:27 +0200243 struct ide_atapi_pc *failed_pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 /* Packet command stack */
Borislav Petkovd236d742008-04-18 00:46:27 +0200245 struct ide_atapi_pc pc_stack[IDETAPE_PC_STACK];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 /* Next free packet command storage space */
247 int pc_stack_index;
248 struct request rq_stack[IDETAPE_PC_STACK];
249 /* We implement a circular array */
250 int rq_stack_index;
251
252 /*
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100253 * DSC polling variables.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100255 * While polling for DSC we use postponed_rq to postpone the current
256 * request so that ide.c will be able to service pending requests on the
257 * other device. Note that at most we will have only one DSC (usually
Borislav Petkov5bd50dc2008-04-27 15:38:28 +0200258 * data transfer) request in the device request queue.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 */
260 struct request *postponed_rq;
261 /* The time in which we started polling for DSC */
262 unsigned long dsc_polling_start;
263 /* Timer used to poll for dsc */
264 struct timer_list dsc_timer;
265 /* Read/Write dsc polling frequency */
Borislav Petkov54bb2072008-02-06 02:57:52 +0100266 unsigned long best_dsc_rw_freq;
267 unsigned long dsc_poll_freq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 unsigned long dsc_timeout;
269
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100270 /* Read position information */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 u8 partition;
272 /* Current block */
Borislav Petkov54bb2072008-02-06 02:57:52 +0100273 unsigned int first_frame;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100275 /* Last error information */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 u8 sense_key, asc, ascq;
277
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100278 /* Character device operation */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 unsigned int minor;
280 /* device name */
281 char name[4];
282 /* Current character device data transfer direction */
Borislav Petkov54abf372008-02-06 02:57:52 +0100283 u8 chrdev_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
Borislav Petkov54bb2072008-02-06 02:57:52 +0100285 /* tape block size, usually 512 or 1024 bytes */
286 unsigned short blk_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 int user_bs_factor;
Borislav Petkovb6422012008-02-02 19:56:49 +0100288
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 /* Copy of the tape's Capabilities and Mechanical Page */
Borislav Petkovb6422012008-02-02 19:56:49 +0100290 u8 caps[20];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292 /*
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100293 * Active data transfer request parameters.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100295 * At most, there is only one ide-tape originated data transfer request
296 * in the device request queue. This allows ide.c to easily service
297 * requests from the other device when we postpone our active request.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 */
Borislav Petkov83042b22008-04-27 15:38:27 +0200299
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100300 /* Data buffer size chosen based on the tape's recommendation */
Borislav Petkovf73850a2008-04-27 15:38:33 +0200301 int buffer_size;
Borislav Petkov077e3bd2008-04-27 15:38:34 +0200302 /* merge buffer */
303 struct idetape_bh *merge_bh;
Borislav Petkov01a63aeb2008-04-27 15:38:34 +0200304 /* size of the merge buffer */
305 int merge_bh_size;
Borislav Petkov077e3bd2008-04-27 15:38:34 +0200306 /* pointer to current buffer head within the merge buffer */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 struct idetape_bh *bh;
308 char *b_data;
309 int b_count;
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100310
Borislav Petkova997a432008-04-27 15:38:33 +0200311 int pages_per_buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 /* Wasted space in each stage */
313 int excess_bh_size;
314
315 /* Status/Action flags: long for set_bit */
316 unsigned long flags;
317 /* protects the ide-tape queue */
Borislav Petkov54bb2072008-02-06 02:57:52 +0100318 spinlock_t lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100320 /* Measures average tape speed */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 unsigned long avg_time;
322 int avg_size;
323 int avg_speed;
324
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 /* the door is currently locked */
326 int door_locked;
327 /* the tape hardware is write protected */
328 char drv_write_prot;
329 /* the tape is write protected (hardware or opened as read-only) */
330 char write_prot;
331
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100332 u32 debug_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333} idetape_tape_t;
334
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800335static DEFINE_MUTEX(idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
Will Dysond5dee802005-09-16 02:55:07 -0700337static struct class *idetape_sysfs_class;
338
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339#define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
340
341#define ide_tape_g(disk) \
342 container_of((disk)->private_data, struct ide_tape_obj, driver)
343
344static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
345{
346 struct ide_tape_obj *tape = NULL;
347
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800348 mutex_lock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 tape = ide_tape_g(disk);
350 if (tape)
351 kref_get(&tape->kref);
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800352 mutex_unlock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 return tape;
354}
355
356static void ide_tape_release(struct kref *);
357
358static void ide_tape_put(struct ide_tape_obj *tape)
359{
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800360 mutex_lock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 kref_put(&tape->kref, ide_tape_release);
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800362 mutex_unlock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363}
364
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100366 * The variables below are used for the character device interface. Additional
367 * state variables are defined in our ide_drive_t structure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 */
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100369static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
371#define ide_tape_f(file) ((file)->private_data)
372
373static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
374{
375 struct ide_tape_obj *tape = NULL;
376
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800377 mutex_lock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 tape = idetape_devs[i];
379 if (tape)
380 kref_get(&tape->kref);
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800381 mutex_unlock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 return tape;
383}
384
Borislav Petkovd236d742008-04-18 00:46:27 +0200385static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100386 unsigned int bcount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
388 struct idetape_bh *bh = pc->bh;
389 int count;
390
391 while (bcount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 if (bh == NULL) {
393 printk(KERN_ERR "ide-tape: bh == NULL in "
394 "idetape_input_buffers\n");
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +0200395 ide_pad_transfer(drive, 0, bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 return;
397 }
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100398 count = min(
399 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
400 bcount);
Bartlomiej Zolnierkiewicz9567b342008-04-28 23:44:36 +0200401 drive->hwif->input_data(drive, NULL, bh->b_data +
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100402 atomic_read(&bh->b_count), count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 bcount -= count;
404 atomic_add(count, &bh->b_count);
405 if (atomic_read(&bh->b_count) == bh->b_size) {
406 bh = bh->b_reqnext;
407 if (bh)
408 atomic_set(&bh->b_count, 0);
409 }
410 }
411 pc->bh = bh;
412}
413
Borislav Petkovd236d742008-04-18 00:46:27 +0200414static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100415 unsigned int bcount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416{
417 struct idetape_bh *bh = pc->bh;
418 int count;
419
420 while (bcount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 if (bh == NULL) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100422 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
423 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 return;
425 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
Bartlomiej Zolnierkiewicz9567b342008-04-28 23:44:36 +0200427 drive->hwif->output_data(drive, NULL, pc->b_data, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 bcount -= count;
429 pc->b_data += count;
430 pc->b_count -= count;
431 if (!pc->b_count) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100432 bh = bh->b_reqnext;
433 pc->bh = bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 if (bh) {
435 pc->b_data = bh->b_data;
436 pc->b_count = atomic_read(&bh->b_count);
437 }
438 }
439 }
440}
441
Borislav Petkovd236d742008-04-18 00:46:27 +0200442static void idetape_update_buffers(struct ide_atapi_pc *pc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443{
444 struct idetape_bh *bh = pc->bh;
445 int count;
Borislav Petkovd236d742008-04-18 00:46:27 +0200446 unsigned int bcount = pc->xferred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
Borislav Petkov346331f2008-04-18 00:46:26 +0200448 if (pc->flags & PC_FLAG_WRITING)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 return;
450 while (bcount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 if (bh == NULL) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100452 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
453 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 return;
455 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
457 atomic_set(&bh->b_count, count);
458 if (atomic_read(&bh->b_count) == bh->b_size)
459 bh = bh->b_reqnext;
460 bcount -= count;
461 }
462 pc->bh = bh;
463}
464
465/*
466 * idetape_next_pc_storage returns a pointer to a place in which we can
467 * safely store a packet command, even though we intend to leave the
468 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
469 * commands is allocated at initialization time.
470 */
Borislav Petkovd236d742008-04-18 00:46:27 +0200471static struct ide_atapi_pc *idetape_next_pc_storage(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472{
473 idetape_tape_t *tape = drive->driver_data;
474
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100475 debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index);
476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 if (tape->pc_stack_index == IDETAPE_PC_STACK)
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100478 tape->pc_stack_index = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 return (&tape->pc_stack[tape->pc_stack_index++]);
480}
481
482/*
483 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
484 * Since we queue packet commands in the request queue, we need to
485 * allocate a request, along with the allocation of a packet command.
486 */
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100487
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488/**************************************************************
489 * *
490 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
491 * followed later on by kfree(). -ml *
492 * *
493 **************************************************************/
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100494
495static struct request *idetape_next_rq_storage(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496{
497 idetape_tape_t *tape = drive->driver_data;
498
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100499 debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index);
500
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 if (tape->rq_stack_index == IDETAPE_PC_STACK)
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100502 tape->rq_stack_index = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 return (&tape->rq_stack[tape->rq_stack_index++]);
504}
505
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506/*
Borislav Petkov1b5db432008-02-02 19:56:48 +0100507 * called on each failed packet command retry to analyze the request sense. We
508 * currently do not utilize this information.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 */
Borislav Petkov1b5db432008-02-02 19:56:48 +0100510static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511{
512 idetape_tape_t *tape = drive->driver_data;
Borislav Petkovd236d742008-04-18 00:46:27 +0200513 struct ide_atapi_pc *pc = tape->failed_pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
Borislav Petkov1b5db432008-02-02 19:56:48 +0100515 tape->sense_key = sense[2] & 0xF;
516 tape->asc = sense[12];
517 tape->ascq = sense[13];
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100518
519 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
520 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Borislav Petkovd236d742008-04-18 00:46:27 +0200522 /* Correct pc->xferred by asking the tape. */
Borislav Petkov346331f2008-04-18 00:46:26 +0200523 if (pc->flags & PC_FLAG_DMA_ERROR) {
Borislav Petkovd236d742008-04-18 00:46:27 +0200524 pc->xferred = pc->req_xfer -
Borislav Petkov54bb2072008-02-06 02:57:52 +0100525 tape->blk_size *
Harvey Harrison5d0cc8a2008-07-15 21:21:41 +0200526 get_unaligned_be32(&sense[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 idetape_update_buffers(pc);
528 }
529
530 /*
531 * If error was the result of a zero-length read or write command,
532 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
533 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
534 */
Borislav Petkov90699ce2008-02-02 19:56:50 +0100535 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
Borislav Petkov1b5db432008-02-02 19:56:48 +0100536 /* length == 0 */
537 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
538 if (tape->sense_key == 5) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 /* don't report an error, everything's ok */
540 pc->error = 0;
541 /* don't retry read/write */
Borislav Petkov346331f2008-04-18 00:46:26 +0200542 pc->flags |= PC_FLAG_ABORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 }
544 }
Borislav Petkov90699ce2008-02-02 19:56:50 +0100545 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 pc->error = IDETAPE_ERROR_FILEMARK;
Borislav Petkov346331f2008-04-18 00:46:26 +0200547 pc->flags |= PC_FLAG_ABORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 }
Borislav Petkov90699ce2008-02-02 19:56:50 +0100549 if (pc->c[0] == WRITE_6) {
Borislav Petkov1b5db432008-02-02 19:56:48 +0100550 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
551 && tape->asc == 0x0 && tape->ascq == 0x2)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 pc->error = IDETAPE_ERROR_EOD;
Borislav Petkov346331f2008-04-18 00:46:26 +0200553 pc->flags |= PC_FLAG_ABORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 }
555 }
Borislav Petkov90699ce2008-02-02 19:56:50 +0100556 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
Borislav Petkov1b5db432008-02-02 19:56:48 +0100557 if (tape->sense_key == 8) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 pc->error = IDETAPE_ERROR_EOD;
Borislav Petkov346331f2008-04-18 00:46:26 +0200559 pc->flags |= PC_FLAG_ABORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 }
Borislav Petkov346331f2008-04-18 00:46:26 +0200561 if (!(pc->flags & PC_FLAG_ABORT) &&
Borislav Petkovd236d742008-04-18 00:46:27 +0200562 pc->xferred)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
564 }
565}
566
Borislav Petkovd01dbc32008-04-27 15:38:33 +0200567/* Free data buffers completely. */
Borislav Petkov077e3bd2008-04-27 15:38:34 +0200568static void ide_tape_kfree_buffer(idetape_tape_t *tape)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569{
Borislav Petkov077e3bd2008-04-27 15:38:34 +0200570 struct idetape_bh *prev_bh, *bh = tape->merge_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
Borislav Petkovd01dbc32008-04-27 15:38:33 +0200572 while (bh) {
573 u32 size = bh->b_size;
574
575 while (size) {
576 unsigned int order = fls(size >> PAGE_SHIFT)-1;
577
578 if (bh->b_data)
579 free_pages((unsigned long)bh->b_data, order);
580
581 size &= (order-1);
582 bh->b_data += (1 << order) * PAGE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 }
584 prev_bh = bh;
585 bh = bh->b_reqnext;
586 kfree(prev_bh);
587 }
Borislav Petkov077e3bd2008-04-27 15:38:34 +0200588 kfree(tape->merge_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589}
590
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
592{
593 struct request *rq = HWGROUP(drive)->rq;
594 idetape_tape_t *tape = drive->driver_data;
595 unsigned long flags;
596 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100598 debug_log(DBG_PROCS, "Enter %s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
600 switch (uptodate) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100601 case 0: error = IDETAPE_ERROR_GENERAL; break;
602 case 1: error = 0; break;
603 default: error = uptodate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 }
605 rq->errors = error;
606 if (error)
607 tape->failed_pc = NULL;
608
Bartlomiej Zolnierkiewicz36872212008-01-26 20:13:10 +0100609 if (!blk_special_request(rq)) {
610 ide_end_request(drive, uptodate, nr_sects);
611 return 0;
612 }
613
Borislav Petkov54bb2072008-02-06 02:57:52 +0100614 spin_lock_irqsave(&tape->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 ide_end_drive_cmd(drive, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
Borislav Petkov54bb2072008-02-06 02:57:52 +0100618 spin_unlock_irqrestore(&tape->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 return 0;
620}
621
Bartlomiej Zolnierkiewicz92f5daf2008-07-15 21:21:55 +0200622static void ide_tape_callback(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623{
624 idetape_tape_t *tape = drive->driver_data;
Bartlomiej Zolnierkiewicz5985e6a2008-07-15 21:21:55 +0200625 struct ide_atapi_pc *pc = tape->pc;
626 int uptodate = pc->error ? 0 : 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100628 debug_log(DBG_PROCS, "Enter %s\n", __func__);
629
Bartlomiej Zolnierkiewiczdd2e9a02008-07-15 21:22:01 +0200630 if (tape->failed_pc == pc)
631 tape->failed_pc = NULL;
632
Bartlomiej Zolnierkiewicz5985e6a2008-07-15 21:21:55 +0200633 if (pc->c[0] == REQUEST_SENSE) {
634 if (uptodate)
635 idetape_analyze_error(drive, pc->buf);
636 else
637 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
638 "itself - Aborting request!\n");
639 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
640 struct request *rq = drive->hwif->hwgroup->rq;
641 int blocks = pc->xferred / tape->blk_size;
642
643 tape->avg_size += blocks * tape->blk_size;
644
645 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
646 tape->avg_speed = tape->avg_size * HZ /
647 (jiffies - tape->avg_time) / 1024;
648 tape->avg_size = 0;
649 tape->avg_time = jiffies;
650 }
651
652 tape->first_frame += blocks;
653 rq->current_nr_sectors -= blocks;
654
655 if (pc->error)
656 uptodate = pc->error;
657 } else if (pc->c[0] == READ_POSITION && uptodate) {
658 u8 *readpos = tape->pc->buf;
659
660 debug_log(DBG_SENSE, "BOP - %s\n",
661 (readpos[0] & 0x80) ? "Yes" : "No");
662 debug_log(DBG_SENSE, "EOP - %s\n",
663 (readpos[0] & 0x40) ? "Yes" : "No");
664
665 if (readpos[0] & 0x4) {
666 printk(KERN_INFO "ide-tape: Block location is unknown"
667 "to the tape\n");
668 clear_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags);
669 uptodate = 0;
670 } else {
671 debug_log(DBG_SENSE, "Block Location - %u\n",
672 be32_to_cpu(*(u32 *)&readpos[4]));
673
674 tape->partition = readpos[1];
675 tape->first_frame = be32_to_cpu(*(u32 *)&readpos[4]);
676 set_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags);
677 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 }
Bartlomiej Zolnierkiewicz5985e6a2008-07-15 21:21:55 +0200679
680 idetape_end_request(drive, uptodate, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681}
682
Bartlomiej Zolnierkiewicz5985e6a2008-07-15 21:21:55 +0200683static void idetape_init_pc(struct ide_atapi_pc *pc)
684{
685 memset(pc->c, 0, 12);
686 pc->retries = 0;
687 pc->flags = 0;
688 pc->req_xfer = 0;
689 pc->buf = pc->pc_buf;
690 pc->buf_size = IDETAPE_PC_BUFFER_SIZE;
691 pc->bh = NULL;
692 pc->b_data = NULL;
Bartlomiej Zolnierkiewicz1b06e922008-07-15 21:21:56 +0200693 pc->callback = ide_tape_callback;
Bartlomiej Zolnierkiewicz5985e6a2008-07-15 21:21:55 +0200694}
695
Borislav Petkovd236d742008-04-18 00:46:27 +0200696static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697{
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100698 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +0100699 pc->c[0] = REQUEST_SENSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 pc->c[4] = 20;
Borislav Petkovd236d742008-04-18 00:46:27 +0200701 pc->req_xfer = 20;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702}
703
704static void idetape_init_rq(struct request *rq, u8 cmd)
705{
FUJITA Tomonorie7b241a2008-04-29 09:54:38 +0200706 blk_rq_init(NULL, rq);
Jens Axboe4aff5e22006-08-10 08:44:47 +0200707 rq->cmd_type = REQ_TYPE_SPECIAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 rq->cmd[0] = cmd;
709}
710
711/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100712 * Generate a new packet command request in front of the request queue, before
713 * the current request, so that it will be processed immediately, on the next
714 * pass through the driver. The function below is called from the request
715 * handling part of the driver (the "bottom" part). Safe storage for the request
716 * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100718 * Memory for those requests is pre-allocated at initialization time, and is
719 * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for
720 * the maximum possible number of inter-dependent packet commands.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100722 * The higher level of the driver - The ioctl handler and the character device
723 * handling functions should queue request to the lower level part and wait for
724 * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 */
Borislav Petkovd236d742008-04-18 00:46:27 +0200726static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc,
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100727 struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728{
729 struct ide_tape_obj *tape = drive->driver_data;
730
731 idetape_init_rq(rq, REQ_IDETAPE_PC1);
Bartlomiej Zolnierkiewicze8a96aa2008-07-15 21:21:41 +0200732 rq->cmd_flags |= REQ_PREEMPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 rq->buffer = (char *) pc;
734 rq->rq_disk = tape->disk;
FUJITA Tomonori63f5abb2008-07-15 21:21:51 +0200735 ide_do_drive_cmd(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736}
737
738/*
739 * idetape_retry_pc is called when an error was detected during the
740 * last packet command. We queue a request sense packet command in
741 * the head of the request list.
742 */
Bartlomiej Zolnierkiewicz258ec412008-07-15 21:21:55 +0200743static void idetape_retry_pc(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744{
745 idetape_tape_t *tape = drive->driver_data;
Borislav Petkovd236d742008-04-18 00:46:27 +0200746 struct ide_atapi_pc *pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 struct request *rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
Bartlomiej Zolnierkiewicz64a57fe2008-02-06 02:57:51 +0100749 (void)ide_read_error(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 pc = idetape_next_pc_storage(drive);
751 rq = idetape_next_rq_storage(drive);
752 idetape_create_request_sense_cmd(pc);
Borislav Petkov346331f2008-04-18 00:46:26 +0200753 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 idetape_queue_pc_head(drive, pc, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755}
756
757/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100758 * Postpone the current request so that ide.c will be able to service requests
759 * from another device on the same hwgroup while we are polling for DSC.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 */
Borislav Petkov5a04cfa2008-02-06 02:57:54 +0100761static void idetape_postpone_request(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762{
763 idetape_tape_t *tape = drive->driver_data;
764
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100765 debug_log(DBG_PROCS, "Enter %s\n", __func__);
766
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 tape->postponed_rq = HWGROUP(drive)->rq;
Borislav Petkov54bb2072008-02-06 02:57:52 +0100768 ide_stall_queue(drive, tape->dsc_poll_freq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769}
770
Bartlomiej Zolnierkiewicz74e63e742008-07-15 21:22:01 +0200771static void ide_tape_handle_dsc(ide_drive_t *drive)
772{
773 idetape_tape_t *tape = drive->driver_data;
774
775 /* Media access command */
776 tape->dsc_polling_start = jiffies;
777 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
778 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
779 /* Allow ide.c to handle other requests */
780 idetape_postpone_request(drive);
781}
782
Bartlomiej Zolnierkiewicz08424ac2008-07-15 21:22:01 +0200783static void ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
784 unsigned int bcount, int write)
785{
786 if (write)
787 idetape_output_buffers(drive, pc, bcount);
788 else
789 idetape_input_buffers(drive, pc, bcount);
790}
Borislav Petkova1efc852008-02-06 02:57:52 +0100791
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792/*
Borislav Petkova1efc852008-02-06 02:57:52 +0100793 * This is the usual interrupt handler which will be called during a packet
794 * command. We will transfer some of the data (as requested by the drive) and
795 * will re-point interrupt handler to us. When data transfer is finished, we
796 * will act according to the algorithm described before
Borislav Petkov8d06bfa2008-02-06 02:57:53 +0100797 * idetape_issue_pc.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 */
Borislav Petkova1efc852008-02-06 02:57:52 +0100799static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800{
801 ide_hwif_t *hwif = drive->hwif;
802 idetape_tape_t *tape = drive->driver_data;
Borislav Petkovd236d742008-04-18 00:46:27 +0200803 struct ide_atapi_pc *pc = tape->pc;
Borislav Petkova1efc852008-02-06 02:57:52 +0100804 xfer_func_t *xferfunc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 unsigned int temp;
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +0100806 u16 bcount;
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100807 u8 stat, ireason;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100809 debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810
811 /* Clear the interrupt */
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +0100812 stat = ide_read_status(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
Borislav Petkov346331f2008-04-18 00:46:26 +0200814 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +0200815 if (hwif->dma_ops->dma_end(drive) || (stat & ERR_STAT)) {
Borislav Petkov346331f2008-04-18 00:46:26 +0200816 pc->flags |= PC_FLAG_DMA_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 } else {
Borislav Petkovd236d742008-04-18 00:46:27 +0200818 pc->xferred = pc->req_xfer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 idetape_update_buffers(pc);
820 }
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100821 debug_log(DBG_PROCS, "DMA finished\n");
822
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 }
824
825 /* No more interrupts */
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +0100826 if ((stat & DRQ_STAT) == 0) {
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100827 debug_log(DBG_SENSE, "Packet command completed, %d bytes"
Borislav Petkovd236d742008-04-18 00:46:27 +0200828 " transferred\n", pc->xferred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
Borislav Petkov346331f2008-04-18 00:46:26 +0200830 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
Bartlomiej Zolnierkiewicz87429bd2008-07-15 21:21:53 +0200831 local_irq_enable_in_hardirq();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832
Borislav Petkov90699ce2008-02-02 19:56:50 +0100833 if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +0100834 stat &= ~ERR_STAT;
Borislav Petkov346331f2008-04-18 00:46:26 +0200835 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) {
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +0100836 /* Error detected */
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100837 debug_log(DBG_ERR, "%s: I/O error\n", tape->name);
838
Borislav Petkov90699ce2008-02-02 19:56:50 +0100839 if (pc->c[0] == REQUEST_SENSE) {
Bartlomiej Zolnierkiewicz568ca922008-07-15 21:21:54 +0200840 printk(KERN_ERR "%s: I/O error in request sense"
841 " command\n", drive->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 return ide_do_reset(drive);
843 }
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100844 debug_log(DBG_ERR, "[cmd %x]: check condition\n",
845 pc->c[0]);
846
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 /* Retry operation */
Bartlomiej Zolnierkiewicz258ec412008-07-15 21:21:55 +0200848 idetape_retry_pc(drive);
849 return ide_stopped;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 }
851 pc->error = 0;
Borislav Petkov346331f2008-04-18 00:46:26 +0200852 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +0100853 (stat & SEEK_STAT) == 0) {
Bartlomiej Zolnierkiewicz74e63e742008-07-15 21:22:01 +0200854 ide_tape_handle_dsc(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 return ide_stopped;
856 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 /* Command finished - Call the callback function */
Bartlomiej Zolnierkiewicz1b06e922008-07-15 21:21:56 +0200858 pc->callback(drive);
Bartlomiej Zolnierkiewicz92f5daf2008-07-15 21:21:55 +0200859 return ide_stopped;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 }
Borislav Petkov346331f2008-04-18 00:46:26 +0200861
862 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
863 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
Bartlomiej Zolnierkiewicz568ca922008-07-15 21:21:54 +0200864 printk(KERN_ERR "%s: The device wants to issue more interrupts "
865 "in DMA mode\n", drive->name);
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100866 ide_dma_off(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 return ide_do_reset(drive);
868 }
869 /* Get the number of bytes to transfer on this interrupt. */
Bartlomiej Zolnierkiewicz4c3032d2008-04-27 15:38:32 +0200870 bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
871 hwif->INB(hwif->io_ports.lbam_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872
Bartlomiej Zolnierkiewicz4c3032d2008-04-27 15:38:32 +0200873 ireason = hwif->INB(hwif->io_ports.nsect_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100875 if (ireason & CD) {
Bartlomiej Zolnierkiewicz568ca922008-07-15 21:21:54 +0200876 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 return ide_do_reset(drive);
878 }
Borislav Petkov346331f2008-04-18 00:46:26 +0200879 if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 /* Hopefully, we will never get here */
Bartlomiej Zolnierkiewicz568ca922008-07-15 21:21:54 +0200881 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
882 "to %s!\n", drive->name,
883 (ireason & IO) ? "Write" : "Read",
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +0100884 (ireason & IO) ? "Read" : "Write");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 return ide_do_reset(drive);
886 }
Borislav Petkov346331f2008-04-18 00:46:26 +0200887 if (!(pc->flags & PC_FLAG_WRITING)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 /* Reading - Check that we have enough space */
Borislav Petkovd236d742008-04-18 00:46:27 +0200889 temp = pc->xferred + bcount;
890 if (temp > pc->req_xfer) {
891 if (temp > pc->buf_size) {
Bartlomiej Zolnierkiewicz568ca922008-07-15 21:21:54 +0200892 printk(KERN_ERR "%s: The device wants to send "
893 "us more data than expected - "
894 "discarding data\n",
895 drive->name);
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +0200896 ide_pad_transfer(drive, 0, bcount);
Borislav Petkova1efc852008-02-06 02:57:52 +0100897 ide_set_handler(drive, &idetape_pc_intr,
898 IDETAPE_WAIT_CMD, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 return ide_started;
900 }
Bartlomiej Zolnierkiewicz568ca922008-07-15 21:21:54 +0200901 debug_log(DBG_SENSE, "The device wants to send us more "
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100902 "data than expected - allowing transfer\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 }
Bartlomiej Zolnierkiewicz9567b342008-04-28 23:44:36 +0200904 xferfunc = hwif->input_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 } else {
Bartlomiej Zolnierkiewicz9567b342008-04-28 23:44:36 +0200906 xferfunc = hwif->output_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 }
Borislav Petkova1efc852008-02-06 02:57:52 +0100908
909 if (pc->bh)
Bartlomiej Zolnierkiewicz08424ac2008-07-15 21:22:01 +0200910 ide_tape_io_buffers(drive, pc, bcount,
911 !!(pc->flags & PC_FLAG_WRITING));
Borislav Petkova1efc852008-02-06 02:57:52 +0100912 else
Bartlomiej Zolnierkiewicz9567b342008-04-28 23:44:36 +0200913 xferfunc(drive, NULL, pc->cur_pos, bcount);
Borislav Petkova1efc852008-02-06 02:57:52 +0100914
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 /* Update the current position */
Borislav Petkovd236d742008-04-18 00:46:27 +0200916 pc->xferred += bcount;
917 pc->cur_pos += bcount;
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100918
919 debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n",
920 pc->c[0], bcount);
921
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 /* And set the interrupt handler again */
923 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
924 return ide_started;
925}
926
927/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100928 * Packet Command Interface
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100930 * The current Packet Command is available in tape->pc, and will not change
931 * until we finish handling it. Each packet command is associated with a
932 * callback function that will be called when the command is finished.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100934 * The handling will be done in three stages:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100936 * 1. idetape_issue_pc will send the packet command to the drive, and will set
937 * the interrupt handler to idetape_pc_intr.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100939 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
940 * repeated until the device signals us that no more interrupts will be issued.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100942 * 3. ATAPI Tape media access commands have immediate status with a delayed
943 * process. In case of a successful initiation of a media access packet command,
944 * the DSC bit will be set when the actual execution of the command is finished.
945 * Since the tape drive will not issue an interrupt, we have to poll for this
946 * event. In this case, we define the request as "low priority request" by
947 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
948 * exit the driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100950 * ide.c will then give higher priority to requests which originate from the
951 * other device, until will change rq_status to RQ_ACTIVE.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100953 * 4. When the packet command is finished, it will be checked for errors.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100955 * 5. In case an error was found, we queue a request sense packet command in
956 * front of the request queue and retry the operation up to
957 * IDETAPE_MAX_PC_RETRIES times.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100959 * 6. In case no error was found, or we decided to give up and not to retry
960 * again, the callback function will be called and then we will handle the next
961 * request.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 */
Bartlomiej Zolnierkiewicz5a7b75a2008-07-15 21:21:57 +0200963static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
964{
Bartlomiej Zolnierkiewicz5a7b75a2008-07-15 21:21:57 +0200965 idetape_tape_t *tape = drive->driver_data;
Bartlomiej Zolnierkiewicz5a7b75a2008-07-15 21:21:57 +0200966
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200967 return ide_transfer_pc(drive, tape->pc, idetape_pc_intr,
968 IDETAPE_WAIT_CMD, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969}
970
Borislav Petkovd236d742008-04-18 00:46:27 +0200971static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
972 struct ide_atapi_pc *pc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975
Borislav Petkov90699ce2008-02-02 19:56:50 +0100976 if (tape->pc->c[0] == REQUEST_SENSE &&
977 pc->c[0] == REQUEST_SENSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
979 "Two request sense in serial were issued\n");
980 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981
Borislav Petkov90699ce2008-02-02 19:56:50 +0100982 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 tape->failed_pc = pc;
984 /* Set the current packet command */
985 tape->pc = pc;
986
987 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
Borislav Petkov346331f2008-04-18 00:46:26 +0200988 (pc->flags & PC_FLAG_ABORT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 /*
Borislav Petkov3c98bf32008-02-06 02:57:53 +0100990 * We will "abort" retrying a packet command in case legitimate
991 * error code was received (crossing a filemark, or end of the
992 * media, for example).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 */
Borislav Petkov346331f2008-04-18 00:46:26 +0200994 if (!(pc->flags & PC_FLAG_ABORT)) {
Borislav Petkov90699ce2008-02-02 19:56:50 +0100995 if (!(pc->c[0] == TEST_UNIT_READY &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 tape->sense_key == 2 && tape->asc == 4 &&
997 (tape->ascq == 1 || tape->ascq == 8))) {
998 printk(KERN_ERR "ide-tape: %s: I/O error, "
999 "pc = %2x, key = %2x, "
1000 "asc = %2x, ascq = %2x\n",
1001 tape->name, pc->c[0],
1002 tape->sense_key, tape->asc,
1003 tape->ascq);
1004 }
1005 /* Giving up */
1006 pc->error = IDETAPE_ERROR_GENERAL;
1007 }
1008 tape->failed_pc = NULL;
Bartlomiej Zolnierkiewicz1b06e922008-07-15 21:21:56 +02001009 pc->callback(drive);
Bartlomiej Zolnierkiewicz92f5daf2008-07-15 21:21:55 +02001010 return ide_stopped;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 }
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001012 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013
1014 pc->retries++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +02001016 return ide_issue_pc(drive, pc, idetape_transfer_pc,
1017 IDETAPE_WAIT_CMD, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018}
1019
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001020/* A mode sense command is used to "sense" tape parameters. */
Borislav Petkovd236d742008-04-18 00:46:27 +02001021static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022{
1023 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001024 pc->c[0] = MODE_SENSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001026 /* DBD = 1 - Don't return block descriptors */
1027 pc->c[1] = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 pc->c[2] = page_code;
1029 /*
1030 * Changed pc->c[3] to 0 (255 will at best return unused info).
1031 *
1032 * For SCSI this byte is defined as subpage instead of high byte
1033 * of length and some IDE drives seem to interpret it this way
1034 * and return an error when 255 is used.
1035 */
1036 pc->c[3] = 0;
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001037 /* We will just discard data in that case */
1038 pc->c[4] = 255;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
Borislav Petkovd236d742008-04-18 00:46:27 +02001040 pc->req_xfer = 12;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
Borislav Petkovd236d742008-04-18 00:46:27 +02001042 pc->req_xfer = 24;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 else
Borislav Petkovd236d742008-04-18 00:46:27 +02001044 pc->req_xfer = 50;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045}
1046
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001047static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048{
1049 idetape_tape_t *tape = drive->driver_data;
Borislav Petkovd236d742008-04-18 00:46:27 +02001050 struct ide_atapi_pc *pc = tape->pc;
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001051 u8 stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +01001053 stat = ide_read_status(drive);
1054
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001055 if (stat & SEEK_STAT) {
1056 if (stat & ERR_STAT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 /* Error detected */
Borislav Petkov90699ce2008-02-02 19:56:50 +01001058 if (pc->c[0] != TEST_UNIT_READY)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 printk(KERN_ERR "ide-tape: %s: I/O error, ",
1060 tape->name);
1061 /* Retry operation */
Bartlomiej Zolnierkiewicz258ec412008-07-15 21:21:55 +02001062 idetape_retry_pc(drive);
1063 return ide_stopped;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 }
1065 pc->error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 } else {
1067 pc->error = IDETAPE_ERROR_GENERAL;
1068 tape->failed_pc = NULL;
1069 }
Bartlomiej Zolnierkiewicz1b06e922008-07-15 21:21:56 +02001070 pc->callback(drive);
Bartlomiej Zolnierkiewicz92f5daf2008-07-15 21:21:55 +02001071 return ide_stopped;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072}
1073
Borislav Petkovd236d742008-04-18 00:46:27 +02001074static void idetape_create_read_cmd(idetape_tape_t *tape,
1075 struct ide_atapi_pc *pc,
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001076 unsigned int length, struct idetape_bh *bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077{
1078 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001079 pc->c[0] = READ_6;
Borislav Petkov860ff5e2008-02-02 19:56:50 +01001080 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 pc->c[1] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 pc->bh = bh;
1083 atomic_set(&bh->b_count, 0);
Borislav Petkovd236d742008-04-18 00:46:27 +02001084 pc->buf = NULL;
1085 pc->buf_size = length * tape->blk_size;
1086 pc->req_xfer = pc->buf_size;
Borislav Petkovf73850a2008-04-27 15:38:33 +02001087 if (pc->req_xfer == tape->buffer_size)
Bartlomiej Zolnierkiewicz5e331092008-07-15 21:21:56 +02001088 pc->flags |= PC_FLAG_DMA_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089}
1090
Borislav Petkovd236d742008-04-18 00:46:27 +02001091static void idetape_create_write_cmd(idetape_tape_t *tape,
1092 struct ide_atapi_pc *pc,
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001093 unsigned int length, struct idetape_bh *bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094{
1095 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001096 pc->c[0] = WRITE_6;
Borislav Petkov860ff5e2008-02-02 19:56:50 +01001097 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 pc->c[1] = 1;
Borislav Petkov346331f2008-04-18 00:46:26 +02001099 pc->flags |= PC_FLAG_WRITING;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 pc->bh = bh;
1101 pc->b_data = bh->b_data;
1102 pc->b_count = atomic_read(&bh->b_count);
Borislav Petkovd236d742008-04-18 00:46:27 +02001103 pc->buf = NULL;
1104 pc->buf_size = length * tape->blk_size;
1105 pc->req_xfer = pc->buf_size;
Borislav Petkovf73850a2008-04-27 15:38:33 +02001106 if (pc->req_xfer == tape->buffer_size)
Bartlomiej Zolnierkiewicz5e331092008-07-15 21:21:56 +02001107 pc->flags |= PC_FLAG_DMA_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108}
1109
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110static ide_startstop_t idetape_do_request(ide_drive_t *drive,
1111 struct request *rq, sector_t block)
1112{
1113 idetape_tape_t *tape = drive->driver_data;
Borislav Petkovd236d742008-04-18 00:46:27 +02001114 struct ide_atapi_pc *pc = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 struct request *postponed_rq = tape->postponed_rq;
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001116 u8 stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001118 debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld,"
1119 " current_nr_sectors: %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121
Jens Axboe4aff5e22006-08-10 08:44:47 +02001122 if (!blk_special_request(rq)) {
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001123 /* We do not support buffer cache originated requests. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
Jens Axboe4aff5e22006-08-10 08:44:47 +02001125 "request queue (%d)\n", drive->name, rq->cmd_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 ide_end_request(drive, 0, 0);
1127 return ide_stopped;
1128 }
1129
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001130 /* Retry a failed packet command */
Bartlomiej Zolnierkiewicz28c72142008-07-15 21:21:59 +02001131 if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) {
1132 pc = tape->failed_pc;
1133 goto out;
1134 }
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001135
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 if (postponed_rq != NULL)
1137 if (rq != postponed_rq) {
1138 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
1139 "Two DSC requests were queued\n");
1140 idetape_end_request(drive, 0, 0);
1141 return ide_stopped;
1142 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143
1144 tape->postponed_rq = NULL;
1145
1146 /*
1147 * If the tape is still busy, postpone our request and service
1148 * the other device meanwhile.
1149 */
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +01001150 stat = ide_read_status(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151
1152 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
Borislav Petkov346331f2008-04-18 00:46:26 +02001153 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154
1155 if (drive->post_reset == 1) {
Borislav Petkov346331f2008-04-18 00:46:26 +02001156 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 drive->post_reset = 0;
1158 }
1159
Borislav Petkov346331f2008-04-18 00:46:26 +02001160 if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags) &&
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001161 (stat & SEEK_STAT) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 if (postponed_rq == NULL) {
1163 tape->dsc_polling_start = jiffies;
Borislav Petkov54bb2072008-02-06 02:57:52 +01001164 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
1166 } else if (time_after(jiffies, tape->dsc_timeout)) {
1167 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
1168 tape->name);
1169 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1170 idetape_media_access_finished(drive);
1171 return ide_stopped;
1172 } else {
1173 return ide_do_reset(drive);
1174 }
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001175 } else if (time_after(jiffies,
1176 tape->dsc_polling_start +
1177 IDETAPE_DSC_MA_THRESHOLD))
Borislav Petkov54bb2072008-02-06 02:57:52 +01001178 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 idetape_postpone_request(drive);
1180 return ide_stopped;
1181 }
1182 if (rq->cmd[0] & REQ_IDETAPE_READ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 pc = idetape_next_pc_storage(drive);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001184 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors,
1185 (struct idetape_bh *)rq->special);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 goto out;
1187 }
1188 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 pc = idetape_next_pc_storage(drive);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001190 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors,
1191 (struct idetape_bh *)rq->special);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 goto out;
1193 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 if (rq->cmd[0] & REQ_IDETAPE_PC1) {
Borislav Petkovd236d742008-04-18 00:46:27 +02001195 pc = (struct ide_atapi_pc *) rq->buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 rq->cmd[0] &= ~(REQ_IDETAPE_PC1);
1197 rq->cmd[0] |= REQ_IDETAPE_PC2;
1198 goto out;
1199 }
1200 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1201 idetape_media_access_finished(drive);
1202 return ide_stopped;
1203 }
1204 BUG();
1205out:
Bartlomiej Zolnierkiewicz28c72142008-07-15 21:21:59 +02001206 if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags))
1207 pc->flags |= PC_FLAG_DRQ_INTERRUPT;
1208
Borislav Petkov8d06bfa2008-02-06 02:57:53 +01001209 return idetape_issue_pc(drive, pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210}
1211
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212/*
Borislav Petkov41aa1702008-04-27 15:38:32 +02001213 * The function below uses __get_free_pages to allocate a data buffer of size
Borislav Petkovf73850a2008-04-27 15:38:33 +02001214 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001215 * much as possible.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 *
Borislav Petkov41aa1702008-04-27 15:38:32 +02001217 * It returns a pointer to the newly allocated buffer, or NULL in case of
1218 * failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 */
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001220static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
1221 int full, int clear)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222{
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001223 struct idetape_bh *prev_bh, *bh, *merge_bh;
Borislav Petkova997a432008-04-27 15:38:33 +02001224 int pages = tape->pages_per_buffer;
Borislav Petkov41aa1702008-04-27 15:38:32 +02001225 unsigned int order, b_allocd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 char *b_data = NULL;
1227
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001228 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1229 bh = merge_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230 if (bh == NULL)
1231 goto abort;
Borislav Petkov41aa1702008-04-27 15:38:32 +02001232
1233 order = fls(pages) - 1;
1234 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001235 if (!bh->b_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 goto abort;
Borislav Petkov41aa1702008-04-27 15:38:32 +02001237 b_allocd = (1 << order) * PAGE_SIZE;
1238 pages &= (order-1);
1239
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 if (clear)
Borislav Petkov41aa1702008-04-27 15:38:32 +02001241 memset(bh->b_data, 0, b_allocd);
1242 bh->b_reqnext = NULL;
1243 bh->b_size = b_allocd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1245
Borislav Petkov41aa1702008-04-27 15:38:32 +02001246 while (pages) {
1247 order = fls(pages) - 1;
1248 b_data = (char *) __get_free_pages(GFP_KERNEL, order);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001249 if (!b_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 goto abort;
Borislav Petkov41aa1702008-04-27 15:38:32 +02001251 b_allocd = (1 << order) * PAGE_SIZE;
1252
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 if (clear)
Borislav Petkov41aa1702008-04-27 15:38:32 +02001254 memset(b_data, 0, b_allocd);
1255
1256 /* newly allocated page frames below buffer header or ...*/
1257 if (bh->b_data == b_data + b_allocd) {
1258 bh->b_size += b_allocd;
1259 bh->b_data -= b_allocd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 if (full)
Borislav Petkov41aa1702008-04-27 15:38:32 +02001261 atomic_add(b_allocd, &bh->b_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 continue;
1263 }
Borislav Petkov41aa1702008-04-27 15:38:32 +02001264 /* they are above the header */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 if (b_data == bh->b_data + bh->b_size) {
Borislav Petkov41aa1702008-04-27 15:38:32 +02001266 bh->b_size += b_allocd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 if (full)
Borislav Petkov41aa1702008-04-27 15:38:32 +02001268 atomic_add(b_allocd, &bh->b_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 continue;
1270 }
1271 prev_bh = bh;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001272 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1273 if (!bh) {
Borislav Petkov41aa1702008-04-27 15:38:32 +02001274 free_pages((unsigned long) b_data, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 goto abort;
1276 }
1277 bh->b_reqnext = NULL;
1278 bh->b_data = b_data;
Borislav Petkov41aa1702008-04-27 15:38:32 +02001279 bh->b_size = b_allocd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1281 prev_bh->b_reqnext = bh;
Borislav Petkov41aa1702008-04-27 15:38:32 +02001282
1283 pages &= (order-1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 }
Borislav Petkov41aa1702008-04-27 15:38:32 +02001285
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 bh->b_size -= tape->excess_bh_size;
1287 if (full)
1288 atomic_sub(tape->excess_bh_size, &bh->b_count);
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001289 return merge_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290abort:
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001291 ide_tape_kfree_buffer(tape);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 return NULL;
1293}
1294
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001295static int idetape_copy_stage_from_user(idetape_tape_t *tape,
Borislav Petkov8646c882008-04-27 15:38:26 +02001296 const char __user *buf, int n)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297{
1298 struct idetape_bh *bh = tape->bh;
1299 int count;
Daniel Walkerdcd96372006-06-25 05:47:37 -07001300 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301
1302 while (n) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 if (bh == NULL) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001304 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1305 __func__);
Daniel Walkerdcd96372006-06-25 05:47:37 -07001306 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 }
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001308 count = min((unsigned int)
1309 (bh->b_size - atomic_read(&bh->b_count)),
1310 (unsigned int)n);
1311 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
1312 count))
Daniel Walkerdcd96372006-06-25 05:47:37 -07001313 ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 n -= count;
1315 atomic_add(count, &bh->b_count);
1316 buf += count;
1317 if (atomic_read(&bh->b_count) == bh->b_size) {
1318 bh = bh->b_reqnext;
1319 if (bh)
1320 atomic_set(&bh->b_count, 0);
1321 }
1322 }
1323 tape->bh = bh;
Daniel Walkerdcd96372006-06-25 05:47:37 -07001324 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325}
1326
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001327static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
Borislav Petkov99d74e62008-04-27 15:38:25 +02001328 int n)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329{
1330 struct idetape_bh *bh = tape->bh;
1331 int count;
Daniel Walkerdcd96372006-06-25 05:47:37 -07001332 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333
1334 while (n) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 if (bh == NULL) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001336 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1337 __func__);
Daniel Walkerdcd96372006-06-25 05:47:37 -07001338 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 count = min(tape->b_count, n);
Daniel Walkerdcd96372006-06-25 05:47:37 -07001341 if (copy_to_user(buf, tape->b_data, count))
1342 ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 n -= count;
1344 tape->b_data += count;
1345 tape->b_count -= count;
1346 buf += count;
1347 if (!tape->b_count) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001348 bh = bh->b_reqnext;
1349 tape->bh = bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 if (bh) {
1351 tape->b_data = bh->b_data;
1352 tape->b_count = atomic_read(&bh->b_count);
1353 }
1354 }
1355 }
Daniel Walkerdcd96372006-06-25 05:47:37 -07001356 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357}
1358
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001359static void idetape_init_merge_buffer(idetape_tape_t *tape)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360{
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001361 struct idetape_bh *bh = tape->merge_bh;
1362 tape->bh = tape->merge_bh;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001363
Borislav Petkov54abf372008-02-06 02:57:52 +01001364 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 atomic_set(&bh->b_count, 0);
1366 else {
1367 tape->b_data = bh->b_data;
1368 tape->b_count = atomic_read(&bh->b_count);
1369 }
1370}
1371
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001373 * Write a filemark if write_filemark=1. Flush the device buffers without
1374 * writing a filemark otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 */
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001376static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
Borislav Petkovd236d742008-04-18 00:46:27 +02001377 struct ide_atapi_pc *pc, int write_filemark)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378{
1379 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001380 pc->c[0] = WRITE_FILEMARKS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 pc->c[4] = write_filemark;
Borislav Petkov346331f2008-04-18 00:46:26 +02001382 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383}
1384
Borislav Petkovd236d742008-04-18 00:46:27 +02001385static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386{
1387 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001388 pc->c[0] = TEST_UNIT_READY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389}
1390
1391/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001392 * We add a special packet command request to the tail of the request queue, and
1393 * wait for it to be serviced. This is not to be called from within the request
1394 * handling part of the driver! We allocate here data on the stack and it is
1395 * valid until the request is finished. This is not the case for the bottom part
1396 * of the driver, where we are always leaving the functions to wait for an
1397 * interrupt or a timer event.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001399 * From the bottom part of the driver, we should allocate safe memory using
1400 * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request
1401 * to the request list without waiting for it to be serviced! In that case, we
1402 * usually use idetape_queue_pc_head().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 */
Borislav Petkovea1ab3d2008-04-27 15:38:27 +02001404static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405{
1406 struct ide_tape_obj *tape = drive->driver_data;
FUJITA Tomonori64ea1b42008-07-15 21:21:43 +02001407 struct request *rq;
1408 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409
FUJITA Tomonori64ea1b42008-07-15 21:21:43 +02001410 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1411 rq->cmd_type = REQ_TYPE_SPECIAL;
1412 rq->cmd[0] = REQ_IDETAPE_PC1;
1413 rq->buffer = (char *)pc;
1414 error = blk_execute_rq(drive->queue, tape->disk, rq, 0);
1415 blk_put_request(rq);
1416 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417}
1418
Borislav Petkovd236d742008-04-18 00:46:27 +02001419static void idetape_create_load_unload_cmd(ide_drive_t *drive,
1420 struct ide_atapi_pc *pc, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421{
1422 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001423 pc->c[0] = START_STOP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 pc->c[4] = cmd;
Borislav Petkov346331f2008-04-18 00:46:26 +02001425 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426}
1427
1428static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1429{
1430 idetape_tape_t *tape = drive->driver_data;
Borislav Petkovd236d742008-04-18 00:46:27 +02001431 struct ide_atapi_pc pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 int load_attempted = 0;
1433
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001434 /* Wait for the tape to become ready */
Borislav Petkov346331f2008-04-18 00:46:26 +02001435 set_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 timeout += jiffies;
1437 while (time_before(jiffies, timeout)) {
1438 idetape_create_test_unit_ready_cmd(&pc);
Borislav Petkovea1ab3d2008-04-27 15:38:27 +02001439 if (!idetape_queue_pc_tail(drive, &pc))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 return 0;
1441 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001442 || (tape->asc == 0x3A)) {
1443 /* no media */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 if (load_attempted)
1445 return -ENOMEDIUM;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001446 idetape_create_load_unload_cmd(drive, &pc,
1447 IDETAPE_LU_LOAD_MASK);
Borislav Petkovea1ab3d2008-04-27 15:38:27 +02001448 idetape_queue_pc_tail(drive, &pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449 load_attempted = 1;
1450 /* not about to be ready */
1451 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1452 (tape->ascq == 1 || tape->ascq == 8)))
1453 return -EIO;
Nishanth Aravamudan80ce45f2005-09-10 00:27:08 -07001454 msleep(100);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 }
1456 return -EIO;
1457}
1458
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001459static int idetape_flush_tape_buffers(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460{
Borislav Petkovd236d742008-04-18 00:46:27 +02001461 struct ide_atapi_pc pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 int rc;
1463
1464 idetape_create_write_filemark_cmd(drive, &pc, 0);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001465 rc = idetape_queue_pc_tail(drive, &pc);
1466 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 return rc;
1468 idetape_wait_ready(drive, 60 * 5 * HZ);
1469 return 0;
1470}
1471
Borislav Petkovd236d742008-04-18 00:46:27 +02001472static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473{
1474 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001475 pc->c[0] = READ_POSITION;
Borislav Petkovd236d742008-04-18 00:46:27 +02001476 pc->req_xfer = 20;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477}
1478
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001479static int idetape_read_position(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480{
1481 idetape_tape_t *tape = drive->driver_data;
Borislav Petkovd236d742008-04-18 00:46:27 +02001482 struct ide_atapi_pc pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 int position;
1484
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001485 debug_log(DBG_PROCS, "Enter %s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486
1487 idetape_create_read_position_cmd(&pc);
1488 if (idetape_queue_pc_tail(drive, &pc))
1489 return -1;
Borislav Petkov54bb2072008-02-06 02:57:52 +01001490 position = tape->first_frame;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 return position;
1492}
1493
Borislav Petkovd236d742008-04-18 00:46:27 +02001494static void idetape_create_locate_cmd(ide_drive_t *drive,
1495 struct ide_atapi_pc *pc,
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001496 unsigned int block, u8 partition, int skip)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497{
1498 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001499 pc->c[0] = POSITION_TO_ELEMENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 pc->c[1] = 2;
Borislav Petkov860ff5e2008-02-02 19:56:50 +01001501 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 pc->c[8] = partition;
Borislav Petkov346331f2008-04-18 00:46:26 +02001503 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504}
1505
Borislav Petkovd236d742008-04-18 00:46:27 +02001506static int idetape_create_prevent_cmd(ide_drive_t *drive,
1507 struct ide_atapi_pc *pc, int prevent)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508{
1509 idetape_tape_t *tape = drive->driver_data;
1510
Borislav Petkovb6422012008-02-02 19:56:49 +01001511 /* device supports locking according to capabilities page */
1512 if (!(tape->caps[6] & 0x01))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513 return 0;
1514
1515 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001516 pc->c[0] = ALLOW_MEDIUM_REMOVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 pc->c[4] = prevent;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518 return 1;
1519}
1520
Borislav Petkovec0fdb02008-04-27 15:38:34 +02001521static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522{
1523 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524
Borislav Petkov54abf372008-02-06 02:57:52 +01001525 if (tape->chrdev_dir != IDETAPE_DIR_READ)
Borislav Petkov97986302008-04-27 15:38:34 +02001526 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527
Borislav Petkov83042b22008-04-27 15:38:27 +02001528 clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags);
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02001529 tape->merge_bh_size = 0;
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001530 if (tape->merge_bh != NULL) {
1531 ide_tape_kfree_buffer(tape);
1532 tape->merge_bh = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533 }
1534
Borislav Petkov54abf372008-02-06 02:57:52 +01001535 tape->chrdev_dir = IDETAPE_DIR_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536}
1537
1538/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001539 * Position the tape to the requested block using the LOCATE packet command.
1540 * A READ POSITION command is then issued to check where we are positioned. Like
1541 * all higher level operations, we queue the commands at the tail of the request
1542 * queue and wait for their completion.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543 */
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001544static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1545 u8 partition, int skip)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546{
1547 idetape_tape_t *tape = drive->driver_data;
1548 int retval;
Borislav Petkovd236d742008-04-18 00:46:27 +02001549 struct ide_atapi_pc pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550
Borislav Petkov54abf372008-02-06 02:57:52 +01001551 if (tape->chrdev_dir == IDETAPE_DIR_READ)
Borislav Petkovec0fdb02008-04-27 15:38:34 +02001552 __ide_tape_discard_merge_buffer(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553 idetape_wait_ready(drive, 60 * 5 * HZ);
1554 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1555 retval = idetape_queue_pc_tail(drive, &pc);
1556 if (retval)
1557 return (retval);
1558
1559 idetape_create_read_position_cmd(&pc);
1560 return (idetape_queue_pc_tail(drive, &pc));
1561}
1562
Borislav Petkovec0fdb02008-04-27 15:38:34 +02001563static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001564 int restore_position)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565{
1566 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 int seek, position;
1568
Borislav Petkovec0fdb02008-04-27 15:38:34 +02001569 __ide_tape_discard_merge_buffer(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 if (restore_position) {
1571 position = idetape_read_position(drive);
Borislav Petkov97986302008-04-27 15:38:34 +02001572 seek = position > 0 ? position : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 if (idetape_position_tape(drive, seek, 0, 0)) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001574 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
Borislav Petkovec0fdb02008-04-27 15:38:34 +02001575 " %s\n", tape->name, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 return;
1577 }
1578 }
1579}
1580
1581/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001582 * Generate a read/write request for the block device interface and wait for it
1583 * to be serviced.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 */
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001585static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1586 struct idetape_bh *bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587{
1588 idetape_tape_t *tape = drive->driver_data;
FUJITA Tomonori64ea1b42008-07-15 21:21:43 +02001589 struct request *rq;
1590 int ret, errors;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001592 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1593
FUJITA Tomonori64ea1b42008-07-15 21:21:43 +02001594 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1595 rq->cmd_type = REQ_TYPE_SPECIAL;
1596 rq->cmd[0] = cmd;
1597 rq->rq_disk = tape->disk;
1598 rq->special = (void *)bh;
1599 rq->sector = tape->first_frame;
1600 rq->nr_sectors = blocks;
1601 rq->current_nr_sectors = blocks;
1602 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1603
1604 errors = rq->errors;
1605 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1606 blk_put_request(rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607
1608 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1609 return 0;
1610
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001611 if (tape->merge_bh)
1612 idetape_init_merge_buffer(tape);
FUJITA Tomonori64ea1b42008-07-15 21:21:43 +02001613 if (errors == IDETAPE_ERROR_GENERAL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 return -EIO;
FUJITA Tomonori64ea1b42008-07-15 21:21:43 +02001615 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616}
1617
Borislav Petkovd236d742008-04-18 00:46:27 +02001618static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619{
1620 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001621 pc->c[0] = INQUIRY;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001622 pc->c[4] = 254;
Borislav Petkovd236d742008-04-18 00:46:27 +02001623 pc->req_xfer = 254;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624}
1625
Borislav Petkovd236d742008-04-18 00:46:27 +02001626static void idetape_create_rewind_cmd(ide_drive_t *drive,
1627 struct ide_atapi_pc *pc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628{
1629 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001630 pc->c[0] = REZERO_UNIT;
Borislav Petkov346331f2008-04-18 00:46:26 +02001631 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632}
1633
Borislav Petkovd236d742008-04-18 00:46:27 +02001634static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635{
1636 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001637 pc->c[0] = ERASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638 pc->c[1] = 1;
Borislav Petkov346331f2008-04-18 00:46:26 +02001639 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640}
1641
Borislav Petkovd236d742008-04-18 00:46:27 +02001642static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643{
1644 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001645 pc->c[0] = SPACE;
Borislav Petkov860ff5e2008-02-02 19:56:50 +01001646 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647 pc->c[1] = cmd;
Borislav Petkov346331f2008-04-18 00:46:26 +02001648 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649}
1650
Borislav Petkov97c566c2008-04-27 15:38:25 +02001651/* Queue up a character device originated write request. */
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001652static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653{
1654 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001656 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657
Borislav Petkov0aa4b012008-04-27 15:38:27 +02001658 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001659 blocks, tape->merge_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660}
1661
Borislav Petkovd9df9372008-04-27 15:38:34 +02001662static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663{
1664 idetape_tape_t *tape = drive->driver_data;
1665 int blocks, min;
1666 struct idetape_bh *bh;
Borislav Petkov55a5d292008-02-02 19:56:49 +01001667
Borislav Petkov54abf372008-02-06 02:57:52 +01001668 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001669 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001670 " but we are not writing.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 return;
1672 }
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02001673 if (tape->merge_bh_size > tape->buffer_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02001675 tape->merge_bh_size = tape->buffer_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676 }
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02001677 if (tape->merge_bh_size) {
1678 blocks = tape->merge_bh_size / tape->blk_size;
1679 if (tape->merge_bh_size % tape->blk_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680 unsigned int i;
1681
1682 blocks++;
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02001683 i = tape->blk_size - tape->merge_bh_size %
Borislav Petkov54bb2072008-02-06 02:57:52 +01001684 tape->blk_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685 bh = tape->bh->b_reqnext;
1686 while (bh) {
1687 atomic_set(&bh->b_count, 0);
1688 bh = bh->b_reqnext;
1689 }
1690 bh = tape->bh;
1691 while (i) {
1692 if (bh == NULL) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001693 printk(KERN_INFO "ide-tape: bug,"
1694 " bh NULL\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695 break;
1696 }
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001697 min = min(i, (unsigned int)(bh->b_size -
1698 atomic_read(&bh->b_count)));
1699 memset(bh->b_data + atomic_read(&bh->b_count),
1700 0, min);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 atomic_add(min, &bh->b_count);
1702 i -= min;
1703 bh = bh->b_reqnext;
1704 }
1705 }
1706 (void) idetape_add_chrdev_write_request(drive, blocks);
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02001707 tape->merge_bh_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708 }
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001709 if (tape->merge_bh != NULL) {
1710 ide_tape_kfree_buffer(tape);
1711 tape->merge_bh = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712 }
Borislav Petkov54abf372008-02-06 02:57:52 +01001713 tape->chrdev_dir = IDETAPE_DIR_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714}
1715
Borislav Petkov83042b22008-04-27 15:38:27 +02001716static int idetape_init_read(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717{
1718 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719 int bytes_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720
1721 /* Initialize read operation */
Borislav Petkov54abf372008-02-06 02:57:52 +01001722 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1723 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
Borislav Petkovd9df9372008-04-27 15:38:34 +02001724 ide_tape_flush_merge_buffer(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 idetape_flush_tape_buffers(drive);
1726 }
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001727 if (tape->merge_bh || tape->merge_bh_size) {
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02001728 printk(KERN_ERR "ide-tape: merge_bh_size should be"
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001729 " 0 now\n");
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02001730 tape->merge_bh_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731 }
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001732 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1733 if (!tape->merge_bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734 return -ENOMEM;
Borislav Petkov54abf372008-02-06 02:57:52 +01001735 tape->chrdev_dir = IDETAPE_DIR_READ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736
1737 /*
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001738 * Issue a read 0 command to ensure that DSC handshake is
1739 * switched from completion mode to buffer available mode.
1740 * No point in issuing this if DSC overlap isn't supported, some
1741 * drives (Seagate STT3401A) will return an error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742 */
1743 if (drive->dsc_overlap) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001744 bytes_read = idetape_queue_rw_tail(drive,
1745 REQ_IDETAPE_READ, 0,
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001746 tape->merge_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747 if (bytes_read < 0) {
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001748 ide_tape_kfree_buffer(tape);
1749 tape->merge_bh = NULL;
Borislav Petkov54abf372008-02-06 02:57:52 +01001750 tape->chrdev_dir = IDETAPE_DIR_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751 return bytes_read;
1752 }
1753 }
1754 }
Borislav Petkov5e69bd92008-04-27 15:38:25 +02001755
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756 return 0;
1757}
1758
Borislav Petkov5bd50dc2008-04-27 15:38:28 +02001759/* called from idetape_chrdev_read() to service a chrdev read request. */
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001760static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761{
1762 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001764 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001766 /* If we are at a filemark, return a read length of 0 */
Borislav Petkov346331f2008-04-18 00:46:26 +02001767 if (test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 return 0;
1769
Borislav Petkov83042b22008-04-27 15:38:27 +02001770 idetape_init_read(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771
Borislav Petkov5e69bd92008-04-27 15:38:25 +02001772 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001773 tape->merge_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774}
1775
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001776static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777{
1778 idetape_tape_t *tape = drive->driver_data;
1779 struct idetape_bh *bh;
1780 int blocks;
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001781
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782 while (bcount) {
1783 unsigned int count;
1784
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001785 bh = tape->merge_bh;
Borislav Petkovf73850a2008-04-27 15:38:33 +02001786 count = min(tape->buffer_size, bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001787 bcount -= count;
Borislav Petkov54bb2072008-02-06 02:57:52 +01001788 blocks = count / tape->blk_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 while (count) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001790 atomic_set(&bh->b_count,
1791 min(count, (unsigned int)bh->b_size));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1793 count -= atomic_read(&bh->b_count);
1794 bh = bh->b_reqnext;
1795 }
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001796 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
Borislav Petkov077e3bd2008-04-27 15:38:34 +02001797 tape->merge_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798 }
1799}
1800
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001802 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1803 * currently support only one partition.
1804 */
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001805static int idetape_rewind_tape(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806{
1807 int retval;
Borislav Petkovd236d742008-04-18 00:46:27 +02001808 struct ide_atapi_pc pc;
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001809 idetape_tape_t *tape;
1810 tape = drive->driver_data;
1811
1812 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1813
Linus Torvalds1da177e2005-04-16 15:20:36 -07001814 idetape_create_rewind_cmd(drive, &pc);
1815 retval = idetape_queue_pc_tail(drive, &pc);
1816 if (retval)
1817 return retval;
1818
1819 idetape_create_read_position_cmd(&pc);
1820 retval = idetape_queue_pc_tail(drive, &pc);
1821 if (retval)
1822 return retval;
1823 return 0;
1824}
1825
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001826/* mtio.h compatible commands should be issued to the chrdev interface. */
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001827static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1828 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829{
1830 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831 void __user *argp = (void __user *)arg;
1832
Borislav Petkovd59823f2008-02-02 19:56:51 +01001833 struct idetape_config {
1834 int dsc_rw_frequency;
1835 int dsc_media_access_frequency;
1836 int nr_stages;
1837 } config;
1838
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001839 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1840
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841 switch (cmd) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001842 case 0x0340:
1843 if (copy_from_user(&config, argp, sizeof(config)))
1844 return -EFAULT;
1845 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001846 break;
1847 case 0x0350:
1848 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
Borislav Petkov83042b22008-04-27 15:38:27 +02001849 config.nr_stages = 1;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001850 if (copy_to_user(argp, &config, sizeof(config)))
1851 return -EFAULT;
1852 break;
1853 default:
1854 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001855 }
1856 return 0;
1857}
1858
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001859static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1860 int mt_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861{
1862 idetape_tape_t *tape = drive->driver_data;
Borislav Petkovd236d742008-04-18 00:46:27 +02001863 struct ide_atapi_pc pc;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001864 int retval, count = 0;
Borislav Petkovb6422012008-02-02 19:56:49 +01001865 int sprev = !!(tape->caps[4] & 0x20);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866
1867 if (mt_count == 0)
1868 return 0;
1869 if (MTBSF == mt_op || MTBSFM == mt_op) {
Borislav Petkovb6422012008-02-02 19:56:49 +01001870 if (!sprev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871 return -EIO;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001872 mt_count = -mt_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873 }
1874
Borislav Petkov54abf372008-02-06 02:57:52 +01001875 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02001876 tape->merge_bh_size = 0;
Borislav Petkov346331f2008-04-18 00:46:26 +02001877 if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878 ++count;
Borislav Petkovec0fdb02008-04-27 15:38:34 +02001879 ide_tape_discard_merge_buffer(drive, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880 }
1881
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 switch (mt_op) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001883 case MTFSF:
1884 case MTBSF:
1885 idetape_create_space_cmd(&pc, mt_count - count,
1886 IDETAPE_SPACE_OVER_FILEMARK);
1887 return idetape_queue_pc_tail(drive, &pc);
1888 case MTFSFM:
1889 case MTBSFM:
1890 if (!sprev)
1891 return -EIO;
1892 retval = idetape_space_over_filemarks(drive, MTFSF,
1893 mt_count - count);
1894 if (retval)
1895 return retval;
1896 count = (MTBSFM == mt_op ? 1 : -1);
1897 return idetape_space_over_filemarks(drive, MTFSF, count);
1898 default:
1899 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1900 mt_op);
1901 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902 }
1903}
1904
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001906 * Our character device read / write functions.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001908 * The tape is optimized to maximize throughput when it is transferring an
1909 * integral number of the "continuous transfer limit", which is a parameter of
1910 * the specific tape (26kB on my particular tape, 32kB for Onstream).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +01001912 * As of version 1.3 of the driver, the character device provides an abstract
1913 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1914 * same backup/restore procedure is supported. The driver will internally
1915 * convert the requests to the recommended transfer unit, so that an unmatch
1916 * between the user's block size to the recommended size will only result in a
1917 * (slightly) increased driver overhead, but will no longer hit performance.
1918 * This is not applicable to Onstream.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919 */
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001920static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1921 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922{
1923 struct ide_tape_obj *tape = ide_tape_f(file);
1924 ide_drive_t *drive = tape->drive;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001925 ssize_t bytes_read, temp, actually_read = 0, rc;
Daniel Walkerdcd96372006-06-25 05:47:37 -07001926 ssize_t ret = 0;
Borislav Petkovb6422012008-02-02 19:56:49 +01001927 u16 ctl = *(u16 *)&tape->caps[12];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001929 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930
Borislav Petkov54abf372008-02-06 02:57:52 +01001931 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
Borislav Petkov346331f2008-04-18 00:46:26 +02001932 if (test_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags))
Borislav Petkov54bb2072008-02-06 02:57:52 +01001933 if (count > tape->blk_size &&
1934 (count % tape->blk_size) == 0)
1935 tape->user_bs_factor = count / tape->blk_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 }
Borislav Petkov83042b22008-04-27 15:38:27 +02001937 rc = idetape_init_read(drive);
Borislav Petkov8d06bfa2008-02-06 02:57:53 +01001938 if (rc < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939 return rc;
1940 if (count == 0)
1941 return (0);
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02001942 if (tape->merge_bh_size) {
1943 actually_read = min((unsigned int)(tape->merge_bh_size),
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001944 (unsigned int)count);
Borislav Petkov99d74e62008-04-27 15:38:25 +02001945 if (idetape_copy_stage_to_user(tape, buf, actually_read))
Daniel Walkerdcd96372006-06-25 05:47:37 -07001946 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947 buf += actually_read;
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02001948 tape->merge_bh_size -= actually_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 count -= actually_read;
1950 }
Borislav Petkovf73850a2008-04-27 15:38:33 +02001951 while (count >= tape->buffer_size) {
Borislav Petkovb6422012008-02-02 19:56:49 +01001952 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953 if (bytes_read <= 0)
1954 goto finish;
Borislav Petkov99d74e62008-04-27 15:38:25 +02001955 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
Daniel Walkerdcd96372006-06-25 05:47:37 -07001956 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957 buf += bytes_read;
1958 count -= bytes_read;
1959 actually_read += bytes_read;
1960 }
1961 if (count) {
Borislav Petkovb6422012008-02-02 19:56:49 +01001962 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963 if (bytes_read <= 0)
1964 goto finish;
1965 temp = min((unsigned long)count, (unsigned long)bytes_read);
Borislav Petkov99d74e62008-04-27 15:38:25 +02001966 if (idetape_copy_stage_to_user(tape, buf, temp))
Daniel Walkerdcd96372006-06-25 05:47:37 -07001967 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968 actually_read += temp;
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02001969 tape->merge_bh_size = bytes_read-temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001970 }
1971finish:
Borislav Petkov346331f2008-04-18 00:46:26 +02001972 if (!actually_read && test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) {
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001973 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1974
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975 idetape_space_over_filemarks(drive, MTFSF, 1);
1976 return 0;
1977 }
Daniel Walkerdcd96372006-06-25 05:47:37 -07001978
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001979 return ret ? ret : actually_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980}
1981
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01001982static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983 size_t count, loff_t *ppos)
1984{
1985 struct ide_tape_obj *tape = ide_tape_f(file);
1986 ide_drive_t *drive = tape->drive;
Daniel Walkerdcd96372006-06-25 05:47:37 -07001987 ssize_t actually_written = 0;
1988 ssize_t ret = 0;
Borislav Petkovb6422012008-02-02 19:56:49 +01001989 u16 ctl = *(u16 *)&tape->caps[12];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990
1991 /* The drive is write protected. */
1992 if (tape->write_prot)
1993 return -EACCES;
1994
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001995 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001996
1997 /* Initialize write operation */
Borislav Petkov54abf372008-02-06 02:57:52 +01001998 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1999 if (tape->chrdev_dir == IDETAPE_DIR_READ)
Borislav Petkovec0fdb02008-04-27 15:38:34 +02002000 ide_tape_discard_merge_buffer(drive, 1);
Borislav Petkov077e3bd2008-04-27 15:38:34 +02002001 if (tape->merge_bh || tape->merge_bh_size) {
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02002002 printk(KERN_ERR "ide-tape: merge_bh_size "
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 "should be 0 now\n");
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02002004 tape->merge_bh_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005 }
Borislav Petkov077e3bd2008-04-27 15:38:34 +02002006 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
2007 if (!tape->merge_bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008 return -ENOMEM;
Borislav Petkov54abf372008-02-06 02:57:52 +01002009 tape->chrdev_dir = IDETAPE_DIR_WRITE;
Borislav Petkov077e3bd2008-04-27 15:38:34 +02002010 idetape_init_merge_buffer(tape);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011
2012 /*
Borislav Petkov3c98bf32008-02-06 02:57:53 +01002013 * Issue a write 0 command to ensure that DSC handshake is
2014 * switched from completion mode to buffer available mode. No
2015 * point in issuing this if DSC overlap isn't supported, some
2016 * drives (Seagate STT3401A) will return an error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017 */
2018 if (drive->dsc_overlap) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002019 ssize_t retval = idetape_queue_rw_tail(drive,
2020 REQ_IDETAPE_WRITE, 0,
Borislav Petkov077e3bd2008-04-27 15:38:34 +02002021 tape->merge_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022 if (retval < 0) {
Borislav Petkov077e3bd2008-04-27 15:38:34 +02002023 ide_tape_kfree_buffer(tape);
2024 tape->merge_bh = NULL;
Borislav Petkov54abf372008-02-06 02:57:52 +01002025 tape->chrdev_dir = IDETAPE_DIR_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026 return retval;
2027 }
2028 }
2029 }
2030 if (count == 0)
2031 return (0);
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02002032 if (tape->merge_bh_size) {
2033 if (tape->merge_bh_size >= tape->buffer_size) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002034 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02002035 tape->merge_bh_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002036 }
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002037 actually_written = min((unsigned int)
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02002038 (tape->buffer_size - tape->merge_bh_size),
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002039 (unsigned int)count);
Borislav Petkov8646c882008-04-27 15:38:26 +02002040 if (idetape_copy_stage_from_user(tape, buf, actually_written))
Daniel Walkerdcd96372006-06-25 05:47:37 -07002041 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042 buf += actually_written;
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02002043 tape->merge_bh_size += actually_written;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002044 count -= actually_written;
2045
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02002046 if (tape->merge_bh_size == tape->buffer_size) {
Daniel Walkerdcd96372006-06-25 05:47:37 -07002047 ssize_t retval;
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02002048 tape->merge_bh_size = 0;
Borislav Petkovb6422012008-02-02 19:56:49 +01002049 retval = idetape_add_chrdev_write_request(drive, ctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002050 if (retval <= 0)
2051 return (retval);
2052 }
2053 }
Borislav Petkovf73850a2008-04-27 15:38:33 +02002054 while (count >= tape->buffer_size) {
Daniel Walkerdcd96372006-06-25 05:47:37 -07002055 ssize_t retval;
Borislav Petkovf73850a2008-04-27 15:38:33 +02002056 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
Daniel Walkerdcd96372006-06-25 05:47:37 -07002057 ret = -EFAULT;
Borislav Petkovf73850a2008-04-27 15:38:33 +02002058 buf += tape->buffer_size;
2059 count -= tape->buffer_size;
Borislav Petkovb6422012008-02-02 19:56:49 +01002060 retval = idetape_add_chrdev_write_request(drive, ctl);
Borislav Petkovf73850a2008-04-27 15:38:33 +02002061 actually_written += tape->buffer_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062 if (retval <= 0)
2063 return (retval);
2064 }
2065 if (count) {
2066 actually_written += count;
Borislav Petkov8646c882008-04-27 15:38:26 +02002067 if (idetape_copy_stage_from_user(tape, buf, count))
Daniel Walkerdcd96372006-06-25 05:47:37 -07002068 ret = -EFAULT;
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02002069 tape->merge_bh_size += count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070 }
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002071 return ret ? ret : actually_written;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072}
2073
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002074static int idetape_write_filemark(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075{
Borislav Petkovd236d742008-04-18 00:46:27 +02002076 struct ide_atapi_pc pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077
2078 /* Write a filemark */
2079 idetape_create_write_filemark_cmd(drive, &pc, 1);
2080 if (idetape_queue_pc_tail(drive, &pc)) {
2081 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
2082 return -EIO;
2083 }
2084 return 0;
2085}
2086
2087/*
Borislav Petkovd99c9da2008-02-02 19:56:51 +01002088 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
2089 * requested.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002090 *
Borislav Petkovd99c9da2008-02-02 19:56:51 +01002091 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
2092 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
Borislav Petkov5bd50dc2008-04-27 15:38:28 +02002093 * usually not supported.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094 *
Borislav Petkovd99c9da2008-02-02 19:56:51 +01002095 * The following commands are currently not supported:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096 *
Borislav Petkovd99c9da2008-02-02 19:56:51 +01002097 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
2098 * MT_ST_WRITE_THRESHOLD.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099 */
Borislav Petkovd99c9da2008-02-02 19:56:51 +01002100static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101{
2102 idetape_tape_t *tape = drive->driver_data;
Borislav Petkovd236d742008-04-18 00:46:27 +02002103 struct ide_atapi_pc pc;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002104 int i, retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002106 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
2107 mt_op, mt_count);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002108
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109 switch (mt_op) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002110 case MTFSF:
2111 case MTFSFM:
2112 case MTBSF:
2113 case MTBSFM:
2114 if (!mt_count)
2115 return 0;
2116 return idetape_space_over_filemarks(drive, mt_op, mt_count);
2117 default:
2118 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119 }
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002120
Linus Torvalds1da177e2005-04-16 15:20:36 -07002121 switch (mt_op) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002122 case MTWEOF:
2123 if (tape->write_prot)
2124 return -EACCES;
Borislav Petkovec0fdb02008-04-27 15:38:34 +02002125 ide_tape_discard_merge_buffer(drive, 1);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002126 for (i = 0; i < mt_count; i++) {
2127 retval = idetape_write_filemark(drive);
2128 if (retval)
2129 return retval;
2130 }
2131 return 0;
2132 case MTREW:
Borislav Petkovec0fdb02008-04-27 15:38:34 +02002133 ide_tape_discard_merge_buffer(drive, 0);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002134 if (idetape_rewind_tape(drive))
2135 return -EIO;
2136 return 0;
2137 case MTLOAD:
Borislav Petkovec0fdb02008-04-27 15:38:34 +02002138 ide_tape_discard_merge_buffer(drive, 0);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002139 idetape_create_load_unload_cmd(drive, &pc,
2140 IDETAPE_LU_LOAD_MASK);
2141 return idetape_queue_pc_tail(drive, &pc);
2142 case MTUNLOAD:
2143 case MTOFFL:
2144 /*
2145 * If door is locked, attempt to unlock before
2146 * attempting to eject.
2147 */
2148 if (tape->door_locked) {
2149 if (idetape_create_prevent_cmd(drive, &pc, 0))
2150 if (!idetape_queue_pc_tail(drive, &pc))
2151 tape->door_locked = DOOR_UNLOCKED;
2152 }
Borislav Petkovec0fdb02008-04-27 15:38:34 +02002153 ide_tape_discard_merge_buffer(drive, 0);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002154 idetape_create_load_unload_cmd(drive, &pc,
2155 !IDETAPE_LU_LOAD_MASK);
2156 retval = idetape_queue_pc_tail(drive, &pc);
2157 if (!retval)
Borislav Petkov346331f2008-04-18 00:46:26 +02002158 clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002159 return retval;
2160 case MTNOP:
Borislav Petkovec0fdb02008-04-27 15:38:34 +02002161 ide_tape_discard_merge_buffer(drive, 0);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002162 return idetape_flush_tape_buffers(drive);
2163 case MTRETEN:
Borislav Petkovec0fdb02008-04-27 15:38:34 +02002164 ide_tape_discard_merge_buffer(drive, 0);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002165 idetape_create_load_unload_cmd(drive, &pc,
2166 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
2167 return idetape_queue_pc_tail(drive, &pc);
2168 case MTEOM:
2169 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
2170 return idetape_queue_pc_tail(drive, &pc);
2171 case MTERASE:
2172 (void)idetape_rewind_tape(drive);
2173 idetape_create_erase_cmd(&pc);
2174 return idetape_queue_pc_tail(drive, &pc);
2175 case MTSETBLK:
2176 if (mt_count) {
2177 if (mt_count < tape->blk_size ||
2178 mt_count % tape->blk_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179 return -EIO;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002180 tape->user_bs_factor = mt_count / tape->blk_size;
Borislav Petkov346331f2008-04-18 00:46:26 +02002181 clear_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002182 } else
Borislav Petkov346331f2008-04-18 00:46:26 +02002183 set_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002184 return 0;
2185 case MTSEEK:
Borislav Petkovec0fdb02008-04-27 15:38:34 +02002186 ide_tape_discard_merge_buffer(drive, 0);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002187 return idetape_position_tape(drive,
2188 mt_count * tape->user_bs_factor, tape->partition, 0);
2189 case MTSETPART:
Borislav Petkovec0fdb02008-04-27 15:38:34 +02002190 ide_tape_discard_merge_buffer(drive, 0);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002191 return idetape_position_tape(drive, 0, mt_count, 0);
2192 case MTFSR:
2193 case MTBSR:
2194 case MTLOCK:
2195 if (!idetape_create_prevent_cmd(drive, &pc, 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196 return 0;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002197 retval = idetape_queue_pc_tail(drive, &pc);
2198 if (retval)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002199 return retval;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002200 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
2201 return 0;
2202 case MTUNLOCK:
2203 if (!idetape_create_prevent_cmd(drive, &pc, 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002204 return 0;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002205 retval = idetape_queue_pc_tail(drive, &pc);
2206 if (retval)
2207 return retval;
2208 tape->door_locked = DOOR_UNLOCKED;
2209 return 0;
2210 default:
2211 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
2212 mt_op);
2213 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002214 }
2215}
2216
2217/*
Borislav Petkovd99c9da2008-02-02 19:56:51 +01002218 * Our character device ioctls. General mtio.h magnetic io commands are
2219 * supported here, and not in the corresponding block interface. Our own
2220 * ide-tape ioctls are supported on both interfaces.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002221 */
Borislav Petkovd99c9da2008-02-02 19:56:51 +01002222static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
2223 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002224{
2225 struct ide_tape_obj *tape = ide_tape_f(file);
2226 ide_drive_t *drive = tape->drive;
2227 struct mtop mtop;
2228 struct mtget mtget;
2229 struct mtpos mtpos;
Borislav Petkov54bb2072008-02-06 02:57:52 +01002230 int block_offset = 0, position = tape->first_frame;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002231 void __user *argp = (void __user *)arg;
2232
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002233 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234
Borislav Petkov54abf372008-02-06 02:57:52 +01002235 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
Borislav Petkovd9df9372008-04-27 15:38:34 +02002236 ide_tape_flush_merge_buffer(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237 idetape_flush_tape_buffers(drive);
2238 }
2239 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02002240 block_offset = tape->merge_bh_size /
Borislav Petkov54bb2072008-02-06 02:57:52 +01002241 (tape->blk_size * tape->user_bs_factor);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002242 position = idetape_read_position(drive);
2243 if (position < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002244 return -EIO;
2245 }
2246 switch (cmd) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002247 case MTIOCTOP:
2248 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
2249 return -EFAULT;
2250 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
2251 case MTIOCGET:
2252 memset(&mtget, 0, sizeof(struct mtget));
2253 mtget.mt_type = MT_ISSCSI2;
2254 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
2255 mtget.mt_dsreg =
2256 ((tape->blk_size * tape->user_bs_factor)
2257 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
Borislav Petkov54bb2072008-02-06 02:57:52 +01002258
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002259 if (tape->drv_write_prot)
2260 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
2261
2262 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
2263 return -EFAULT;
2264 return 0;
2265 case MTIOCPOS:
2266 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
2267 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
2268 return -EFAULT;
2269 return 0;
2270 default:
2271 if (tape->chrdev_dir == IDETAPE_DIR_READ)
Borislav Petkovec0fdb02008-04-27 15:38:34 +02002272 ide_tape_discard_merge_buffer(drive, 1);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002273 return idetape_blkdev_ioctl(drive, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002274 }
2275}
2276
Borislav Petkov3cffb9c2008-02-02 19:56:50 +01002277/*
2278 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
2279 * block size with the reported value.
2280 */
2281static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
2282{
2283 idetape_tape_t *tape = drive->driver_data;
Borislav Petkovd236d742008-04-18 00:46:27 +02002284 struct ide_atapi_pc pc;
Borislav Petkov3cffb9c2008-02-02 19:56:50 +01002285
2286 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
2287 if (idetape_queue_pc_tail(drive, &pc)) {
2288 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
Borislav Petkov54bb2072008-02-06 02:57:52 +01002289 if (tape->blk_size == 0) {
Borislav Petkov3cffb9c2008-02-02 19:56:50 +01002290 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
2291 "block size, assuming 32k\n");
Borislav Petkov54bb2072008-02-06 02:57:52 +01002292 tape->blk_size = 32768;
Borislav Petkov3cffb9c2008-02-02 19:56:50 +01002293 }
2294 return;
2295 }
Borislav Petkovd236d742008-04-18 00:46:27 +02002296 tape->blk_size = (pc.buf[4 + 5] << 16) +
2297 (pc.buf[4 + 6] << 8) +
2298 pc.buf[4 + 7];
2299 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
Borislav Petkov3cffb9c2008-02-02 19:56:50 +01002300}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002301
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002302static int idetape_chrdev_open(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303{
2304 unsigned int minor = iminor(inode), i = minor & ~0xc0;
2305 ide_drive_t *drive;
2306 idetape_tape_t *tape;
Borislav Petkovd236d742008-04-18 00:46:27 +02002307 struct ide_atapi_pc pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002308 int retval;
2309
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002310 if (i >= MAX_HWIFS * MAX_DRIVES)
2311 return -ENXIO;
2312
2313 tape = ide_tape_chrdev_get(i);
2314 if (!tape)
2315 return -ENXIO;
2316
2317 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2318
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319 /*
2320 * We really want to do nonseekable_open(inode, filp); here, but some
2321 * versions of tar incorrectly call lseek on tapes and bail out if that
2322 * fails. So we disallow pread() and pwrite(), but permit lseeks.
2323 */
2324 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
2325
Linus Torvalds1da177e2005-04-16 15:20:36 -07002326 drive = tape->drive;
2327
2328 filp->private_data = tape;
2329
Borislav Petkov346331f2008-04-18 00:46:26 +02002330 if (test_and_set_bit(IDETAPE_FLAG_BUSY, &tape->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002331 retval = -EBUSY;
2332 goto out_put_tape;
2333 }
2334
2335 retval = idetape_wait_ready(drive, 60 * HZ);
2336 if (retval) {
Borislav Petkov346331f2008-04-18 00:46:26 +02002337 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
2339 goto out_put_tape;
2340 }
2341
2342 idetape_read_position(drive);
Borislav Petkov346331f2008-04-18 00:46:26 +02002343 if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002344 (void)idetape_rewind_tape(drive);
2345
Linus Torvalds1da177e2005-04-16 15:20:36 -07002346 /* Read block size and write protect status from drive. */
Borislav Petkov3cffb9c2008-02-02 19:56:50 +01002347 ide_tape_get_bsize_from_bdesc(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348
2349 /* Set write protect flag if device is opened as read-only. */
2350 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
2351 tape->write_prot = 1;
2352 else
2353 tape->write_prot = tape->drv_write_prot;
2354
2355 /* Make sure drive isn't write protected if user wants to write. */
2356 if (tape->write_prot) {
2357 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
2358 (filp->f_flags & O_ACCMODE) == O_RDWR) {
Borislav Petkov346331f2008-04-18 00:46:26 +02002359 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002360 retval = -EROFS;
2361 goto out_put_tape;
2362 }
2363 }
2364
Borislav Petkov3c98bf32008-02-06 02:57:53 +01002365 /* Lock the tape drive door so user can't eject. */
Borislav Petkov54abf372008-02-06 02:57:52 +01002366 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002367 if (idetape_create_prevent_cmd(drive, &pc, 1)) {
2368 if (!idetape_queue_pc_tail(drive, &pc)) {
2369 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
2370 tape->door_locked = DOOR_LOCKED;
2371 }
2372 }
2373 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002374 return 0;
2375
2376out_put_tape:
2377 ide_tape_put(tape);
2378 return retval;
2379}
2380
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002381static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002382{
2383 idetape_tape_t *tape = drive->driver_data;
2384
Borislav Petkovd9df9372008-04-27 15:38:34 +02002385 ide_tape_flush_merge_buffer(drive);
Borislav Petkov077e3bd2008-04-27 15:38:34 +02002386 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
2387 if (tape->merge_bh != NULL) {
Borislav Petkov54bb2072008-02-06 02:57:52 +01002388 idetape_pad_zeros(drive, tape->blk_size *
2389 (tape->user_bs_factor - 1));
Borislav Petkov077e3bd2008-04-27 15:38:34 +02002390 ide_tape_kfree_buffer(tape);
2391 tape->merge_bh = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002392 }
2393 idetape_write_filemark(drive);
2394 idetape_flush_tape_buffers(drive);
2395 idetape_flush_tape_buffers(drive);
2396}
2397
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002398static int idetape_chrdev_release(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002399{
2400 struct ide_tape_obj *tape = ide_tape_f(filp);
2401 ide_drive_t *drive = tape->drive;
Borislav Petkovd236d742008-04-18 00:46:27 +02002402 struct ide_atapi_pc pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002403 unsigned int minor = iminor(inode);
2404
2405 lock_kernel();
2406 tape = drive->driver_data;
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002407
2408 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002409
Borislav Petkov54abf372008-02-06 02:57:52 +01002410 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002411 idetape_write_release(drive, minor);
Borislav Petkov54abf372008-02-06 02:57:52 +01002412 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002413 if (minor < 128)
Borislav Petkovec0fdb02008-04-27 15:38:34 +02002414 ide_tape_discard_merge_buffer(drive, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002415 }
Borislav Petkovf64eee72008-04-27 15:38:25 +02002416
Borislav Petkov346331f2008-04-18 00:46:26 +02002417 if (minor < 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002418 (void) idetape_rewind_tape(drive);
Borislav Petkov54abf372008-02-06 02:57:52 +01002419 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002420 if (tape->door_locked == DOOR_LOCKED) {
2421 if (idetape_create_prevent_cmd(drive, &pc, 0)) {
2422 if (!idetape_queue_pc_tail(drive, &pc))
2423 tape->door_locked = DOOR_UNLOCKED;
2424 }
2425 }
2426 }
Borislav Petkov346331f2008-04-18 00:46:26 +02002427 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002428 ide_tape_put(tape);
2429 unlock_kernel();
2430 return 0;
2431}
2432
2433/*
Borislav Petkov71071b82008-02-06 02:57:53 +01002434 * check the contents of the ATAPI IDENTIFY command results. We return:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002435 *
Borislav Petkov71071b82008-02-06 02:57:53 +01002436 * 1 - If the tape can be supported by us, based on the information we have so
2437 * far.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002438 *
Borislav Petkov71071b82008-02-06 02:57:53 +01002439 * 0 - If this tape driver is not currently supported by us.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002440 */
Borislav Petkov71071b82008-02-06 02:57:53 +01002441static int idetape_identify_device(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002442{
Borislav Petkov71071b82008-02-06 02:57:53 +01002443 u8 gcw[2], protocol, device_type, removable, packet_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002444
2445 if (drive->id_read == 0)
2446 return 1;
2447
Borislav Petkov71071b82008-02-06 02:57:53 +01002448 *((unsigned short *) &gcw) = drive->id->config;
2449
2450 protocol = (gcw[1] & 0xC0) >> 6;
2451 device_type = gcw[1] & 0x1F;
2452 removable = !!(gcw[0] & 0x80);
2453 packet_size = gcw[0] & 0x3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002454
Linus Torvalds1da177e2005-04-16 15:20:36 -07002455 /* Check that we can support this device */
Borislav Petkov71071b82008-02-06 02:57:53 +01002456 if (protocol != 2)
Bartlomiej Zolnierkiewicz16422de32008-02-02 19:56:48 +01002457 printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n",
Borislav Petkov71071b82008-02-06 02:57:53 +01002458 protocol);
2459 else if (device_type != 1)
Bartlomiej Zolnierkiewicz16422de32008-02-02 19:56:48 +01002460 printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set "
Borislav Petkov71071b82008-02-06 02:57:53 +01002461 "to tape\n", device_type);
2462 else if (!removable)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002463 printk(KERN_ERR "ide-tape: The removable flag is not set\n");
Borislav Petkov71071b82008-02-06 02:57:53 +01002464 else if (packet_size != 0) {
Borislav Petkov24d57f82008-02-06 02:57:54 +01002465 printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12"
2466 " bytes\n", packet_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002467 } else
2468 return 1;
2469 return 0;
2470}
2471
Borislav Petkov6d29c8f2008-02-02 19:56:49 +01002472static void idetape_get_inquiry_results(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002473{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002474 idetape_tape_t *tape = drive->driver_data;
Borislav Petkovd236d742008-04-18 00:46:27 +02002475 struct ide_atapi_pc pc;
Borislav Petkov41f81d542008-02-06 02:57:52 +01002476 char fw_rev[6], vendor_id[10], product_id[18];
Borislav Petkov6d29c8f2008-02-02 19:56:49 +01002477
Linus Torvalds1da177e2005-04-16 15:20:36 -07002478 idetape_create_inquiry_cmd(&pc);
2479 if (idetape_queue_pc_tail(drive, &pc)) {
Borislav Petkov6d29c8f2008-02-02 19:56:49 +01002480 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2481 tape->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002482 return;
2483 }
Borislav Petkovd236d742008-04-18 00:46:27 +02002484 memcpy(vendor_id, &pc.buf[8], 8);
2485 memcpy(product_id, &pc.buf[16], 16);
2486 memcpy(fw_rev, &pc.buf[32], 4);
Borislav Petkov6d29c8f2008-02-02 19:56:49 +01002487
Borislav Petkov41f81d542008-02-06 02:57:52 +01002488 ide_fixstring(vendor_id, 10, 0);
2489 ide_fixstring(product_id, 18, 0);
2490 ide_fixstring(fw_rev, 6, 0);
2491
Borislav Petkov6d29c8f2008-02-02 19:56:49 +01002492 printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n",
Borislav Petkov41f81d542008-02-06 02:57:52 +01002493 drive->name, tape->name, vendor_id, product_id, fw_rev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002494}
2495
2496/*
Borislav Petkovb6422012008-02-02 19:56:49 +01002497 * Ask the tape about its various parameters. In particular, we will adjust our
2498 * data transfer buffer size to the recommended value as returned by the tape.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002499 */
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002500static void idetape_get_mode_sense_results(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002501{
2502 idetape_tape_t *tape = drive->driver_data;
Borislav Petkovd236d742008-04-18 00:46:27 +02002503 struct ide_atapi_pc pc;
Borislav Petkovb6422012008-02-02 19:56:49 +01002504 u8 *caps;
2505 u8 speed, max_speed;
Borislav Petkov47314fa2008-02-02 19:56:48 +01002506
Linus Torvalds1da177e2005-04-16 15:20:36 -07002507 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2508 if (idetape_queue_pc_tail(drive, &pc)) {
Borislav Petkovb6422012008-02-02 19:56:49 +01002509 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2510 " some default values\n");
Borislav Petkov54bb2072008-02-06 02:57:52 +01002511 tape->blk_size = 512;
Borislav Petkovb6422012008-02-02 19:56:49 +01002512 put_unaligned(52, (u16 *)&tape->caps[12]);
2513 put_unaligned(540, (u16 *)&tape->caps[14]);
2514 put_unaligned(6*52, (u16 *)&tape->caps[16]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515 return;
2516 }
Borislav Petkovd236d742008-04-18 00:46:27 +02002517 caps = pc.buf + 4 + pc.buf[3];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002518
Borislav Petkovb6422012008-02-02 19:56:49 +01002519 /* convert to host order and save for later use */
2520 speed = be16_to_cpu(*(u16 *)&caps[14]);
2521 max_speed = be16_to_cpu(*(u16 *)&caps[8]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002522
Borislav Petkovb6422012008-02-02 19:56:49 +01002523 put_unaligned(max_speed, (u16 *)&caps[8]);
2524 put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]);
2525 put_unaligned(speed, (u16 *)&caps[14]);
2526 put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]);
2527
2528 if (!speed) {
2529 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2530 "(assuming 650KB/sec)\n", drive->name);
2531 put_unaligned(650, (u16 *)&caps[14]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002532 }
Borislav Petkovb6422012008-02-02 19:56:49 +01002533 if (!max_speed) {
2534 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2535 "(assuming 650KB/sec)\n", drive->name);
2536 put_unaligned(650, (u16 *)&caps[8]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002537 }
2538
Borislav Petkovb6422012008-02-02 19:56:49 +01002539 memcpy(&tape->caps, caps, 20);
2540 if (caps[7] & 0x02)
Borislav Petkov54bb2072008-02-06 02:57:52 +01002541 tape->blk_size = 512;
Borislav Petkovb6422012008-02-02 19:56:49 +01002542 else if (caps[7] & 0x04)
Borislav Petkov54bb2072008-02-06 02:57:52 +01002543 tape->blk_size = 1024;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002544}
2545
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02002546#ifdef CONFIG_IDE_PROC_FS
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002547static void idetape_add_settings(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002548{
2549 idetape_tape_t *tape = drive->driver_data;
2550
Borislav Petkovb6422012008-02-02 19:56:49 +01002551 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff,
2552 1, 2, (u16 *)&tape->caps[16], NULL);
Borislav Petkovb6422012008-02-02 19:56:49 +01002553 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff,
2554 1, 1, (u16 *)&tape->caps[14], NULL);
Borislav Petkovf73850a2008-04-27 15:38:33 +02002555 ide_add_setting(drive, "buffer_size", SETTING_READ, TYPE_INT, 0, 0xffff,
2556 1, 1024, &tape->buffer_size, NULL);
Borislav Petkov54bb2072008-02-06 02:57:52 +01002557 ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN,
2558 IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq,
2559 NULL);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002560 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1,
2561 1, &drive->dsc_overlap, NULL);
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002562 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff,
2563 1, 1, &tape->avg_speed, NULL);
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002564 ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1,
2565 1, &tape->debug_mask, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002566}
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02002567#else
2568static inline void idetape_add_settings(ide_drive_t *drive) { ; }
2569#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002570
2571/*
Borislav Petkov3c98bf32008-02-06 02:57:53 +01002572 * The function below is called to:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002573 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +01002574 * 1. Initialize our various state variables.
2575 * 2. Ask the tape for its capabilities.
2576 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2577 * is chosen based on the recommendation which we received in step 2.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002578 *
Borislav Petkov3c98bf32008-02-06 02:57:53 +01002579 * Note that at this point ide.c already assigned us an irq, so that we can
2580 * queue requests here and wait for their completion.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002581 */
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002582static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002583{
Borislav Petkov83042b22008-04-27 15:38:27 +02002584 unsigned long t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002585 int speed;
Borislav Petkovf73850a2008-04-27 15:38:33 +02002586 int buffer_size;
Borislav Petkov71071b82008-02-06 02:57:53 +01002587 u8 gcw[2];
Borislav Petkovb6422012008-02-02 19:56:49 +01002588 u16 *ctl = (u16 *)&tape->caps[12];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002589
Borislav Petkov54bb2072008-02-06 02:57:52 +01002590 spin_lock_init(&tape->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002591 drive->dsc_overlap = 1;
Bartlomiej Zolnierkiewicz4166c192008-02-01 23:09:30 +01002592 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2593 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2594 tape->name);
2595 drive->dsc_overlap = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002596 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002597 /* Seagate Travan drives do not support DSC overlap. */
2598 if (strstr(drive->id->model, "Seagate STT3401"))
2599 drive->dsc_overlap = 0;
2600 tape->minor = minor;
2601 tape->name[0] = 'h';
2602 tape->name[1] = 't';
2603 tape->name[2] = '0' + minor;
Borislav Petkov54abf372008-02-06 02:57:52 +01002604 tape->chrdev_dir = IDETAPE_DIR_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002605 tape->pc = tape->pc_stack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002606 *((unsigned short *) &gcw) = drive->id->config;
Borislav Petkov71071b82008-02-06 02:57:53 +01002607
2608 /* Command packet DRQ type */
2609 if (((gcw[0] & 0x60) >> 5) == 1)
Borislav Petkov346331f2008-04-18 00:46:26 +02002610 set_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002611
Linus Torvalds1da177e2005-04-16 15:20:36 -07002612 idetape_get_inquiry_results(drive);
2613 idetape_get_mode_sense_results(drive);
Borislav Petkov3cffb9c2008-02-02 19:56:50 +01002614 ide_tape_get_bsize_from_bdesc(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002615 tape->user_bs_factor = 1;
Borislav Petkovf73850a2008-04-27 15:38:33 +02002616 tape->buffer_size = *ctl * tape->blk_size;
2617 while (tape->buffer_size > 0xffff) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002618 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
Borislav Petkovb6422012008-02-02 19:56:49 +01002619 *ctl /= 2;
Borislav Petkovf73850a2008-04-27 15:38:33 +02002620 tape->buffer_size = *ctl * tape->blk_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002621 }
Borislav Petkovf73850a2008-04-27 15:38:33 +02002622 buffer_size = tape->buffer_size;
Borislav Petkova997a432008-04-27 15:38:33 +02002623 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
Borislav Petkovf73850a2008-04-27 15:38:33 +02002624 if (buffer_size % PAGE_SIZE) {
Borislav Petkova997a432008-04-27 15:38:33 +02002625 tape->pages_per_buffer++;
Borislav Petkovf73850a2008-04-27 15:38:33 +02002626 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002627 }
2628
Borislav Petkov83042b22008-04-27 15:38:27 +02002629 /* select the "best" DSC read/write polling freq */
Borislav Petkovb6422012008-02-02 19:56:49 +01002630 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002631
Borislav Petkovf73850a2008-04-27 15:38:33 +02002632 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002633
2634 /*
Borislav Petkov3c98bf32008-02-06 02:57:53 +01002635 * Ensure that the number we got makes sense; limit it within
2636 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002637 */
Harvey Harrisona792bd52008-07-15 21:21:41 +02002638 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2639 IDETAPE_DSC_RW_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002640 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
Borislav Petkov83042b22008-04-27 15:38:27 +02002641 "%lums tDSC%s\n",
Borislav Petkovb6422012008-02-02 19:56:49 +01002642 drive->name, tape->name, *(u16 *)&tape->caps[14],
Borislav Petkovf73850a2008-04-27 15:38:33 +02002643 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2644 tape->buffer_size / 1024,
Borislav Petkov54bb2072008-02-06 02:57:52 +01002645 tape->best_dsc_rw_freq * 1000 / HZ,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002646 drive->using_dma ? ", DMA":"");
2647
2648 idetape_add_settings(drive);
2649}
2650
Russell King4031bbe2006-01-06 11:41:00 +00002651static void ide_tape_remove(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002652{
2653 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002654
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02002655 ide_proc_unregister_driver(drive, tape->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002656
2657 ide_unregister_region(tape->disk);
2658
2659 ide_tape_put(tape);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002660}
2661
2662static void ide_tape_release(struct kref *kref)
2663{
2664 struct ide_tape_obj *tape = to_ide_tape(kref);
2665 ide_drive_t *drive = tape->drive;
2666 struct gendisk *g = tape->disk;
2667
Borislav Petkov01a63aeb2008-04-27 15:38:34 +02002668 BUG_ON(tape->merge_bh_size);
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02002669
Linus Torvalds1da177e2005-04-16 15:20:36 -07002670 drive->dsc_overlap = 0;
2671 drive->driver_data = NULL;
Tony Jonesdbc12722007-09-25 02:03:03 +02002672 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002673 device_destroy(idetape_sysfs_class,
2674 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002675 idetape_devs[tape->minor] = NULL;
2676 g->private_data = NULL;
2677 put_disk(g);
2678 kfree(tape);
2679}
2680
Bartlomiej Zolnierkiewiczecfd80e2007-05-10 00:01:09 +02002681#ifdef CONFIG_IDE_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07002682static int proc_idetape_read_name
2683 (char *page, char **start, off_t off, int count, int *eof, void *data)
2684{
2685 ide_drive_t *drive = (ide_drive_t *) data;
2686 idetape_tape_t *tape = drive->driver_data;
2687 char *out = page;
2688 int len;
2689
2690 len = sprintf(out, "%s\n", tape->name);
2691 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2692}
2693
2694static ide_proc_entry_t idetape_proc[] = {
2695 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2696 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2697 { NULL, 0, NULL, NULL }
2698};
Linus Torvalds1da177e2005-04-16 15:20:36 -07002699#endif
2700
Russell King4031bbe2006-01-06 11:41:00 +00002701static int ide_tape_probe(ide_drive_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002702
Linus Torvalds1da177e2005-04-16 15:20:36 -07002703static ide_driver_t idetape_driver = {
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02002704 .gen_driver = {
Laurent Riffard4ef3b8f2005-11-18 22:15:40 +01002705 .owner = THIS_MODULE,
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02002706 .name = "ide-tape",
2707 .bus = &ide_bus_type,
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02002708 },
Russell King4031bbe2006-01-06 11:41:00 +00002709 .probe = ide_tape_probe,
2710 .remove = ide_tape_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002711 .version = IDETAPE_VERSION,
2712 .media = ide_tape,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002713 .supports_dsc_overlap = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002714 .do_request = idetape_do_request,
2715 .end_request = idetape_end_request,
2716 .error = __ide_error,
2717 .abort = __ide_abort,
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02002718#ifdef CONFIG_IDE_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07002719 .proc = idetape_proc,
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02002720#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002721};
2722
Borislav Petkov3c98bf32008-02-06 02:57:53 +01002723/* Our character device supporting functions, passed to register_chrdev. */
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08002724static const struct file_operations idetape_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002725 .owner = THIS_MODULE,
2726 .read = idetape_chrdev_read,
2727 .write = idetape_chrdev_write,
2728 .ioctl = idetape_chrdev_ioctl,
2729 .open = idetape_chrdev_open,
2730 .release = idetape_chrdev_release,
2731};
2732
2733static int idetape_open(struct inode *inode, struct file *filp)
2734{
2735 struct gendisk *disk = inode->i_bdev->bd_disk;
2736 struct ide_tape_obj *tape;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002737
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002738 tape = ide_tape_get(disk);
2739 if (!tape)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002740 return -ENXIO;
2741
Linus Torvalds1da177e2005-04-16 15:20:36 -07002742 return 0;
2743}
2744
2745static int idetape_release(struct inode *inode, struct file *filp)
2746{
2747 struct gendisk *disk = inode->i_bdev->bd_disk;
2748 struct ide_tape_obj *tape = ide_tape_g(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002749
2750 ide_tape_put(tape);
2751
2752 return 0;
2753}
2754
2755static int idetape_ioctl(struct inode *inode, struct file *file,
2756 unsigned int cmd, unsigned long arg)
2757{
2758 struct block_device *bdev = inode->i_bdev;
2759 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
2760 ide_drive_t *drive = tape->drive;
2761 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
2762 if (err == -EINVAL)
2763 err = idetape_blkdev_ioctl(drive, cmd, arg);
2764 return err;
2765}
2766
2767static struct block_device_operations idetape_block_ops = {
2768 .owner = THIS_MODULE,
2769 .open = idetape_open,
2770 .release = idetape_release,
2771 .ioctl = idetape_ioctl,
2772};
2773
Russell King4031bbe2006-01-06 11:41:00 +00002774static int ide_tape_probe(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002775{
2776 idetape_tape_t *tape;
2777 struct gendisk *g;
2778 int minor;
2779
2780 if (!strstr("ide-tape", drive->driver_req))
2781 goto failed;
2782 if (!drive->present)
2783 goto failed;
2784 if (drive->media != ide_tape)
2785 goto failed;
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002786 if (!idetape_identify_device(drive)) {
2787 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2788 " the driver\n", drive->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002789 goto failed;
2790 }
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002791 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002792 if (tape == NULL) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002793 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2794 drive->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002795 goto failed;
2796 }
2797
2798 g = alloc_disk(1 << PARTN_BITS);
2799 if (!g)
2800 goto out_free_tape;
2801
2802 ide_init_disk(g, drive);
2803
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02002804 ide_proc_register_driver(drive, &idetape_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002805
Linus Torvalds1da177e2005-04-16 15:20:36 -07002806 kref_init(&tape->kref);
2807
2808 tape->drive = drive;
2809 tape->driver = &idetape_driver;
2810 tape->disk = g;
2811
2812 g->private_data = &tape->driver;
2813
2814 drive->driver_data = tape;
2815
Arjan van de Vencf8b8972006-03-23 03:00:45 -08002816 mutex_lock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002817 for (minor = 0; idetape_devs[minor]; minor++)
2818 ;
2819 idetape_devs[minor] = tape;
Arjan van de Vencf8b8972006-03-23 03:00:45 -08002820 mutex_unlock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002821
2822 idetape_setup(drive, tape, minor);
2823
Tony Jonesdbc12722007-09-25 02:03:03 +02002824 device_create(idetape_sysfs_class, &drive->gendev,
2825 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name);
2826 device_create(idetape_sysfs_class, &drive->gendev,
2827 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name);
Will Dysond5dee802005-09-16 02:55:07 -07002828
Linus Torvalds1da177e2005-04-16 15:20:36 -07002829 g->fops = &idetape_block_ops;
2830 ide_register_region(g);
2831
2832 return 0;
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02002833
Linus Torvalds1da177e2005-04-16 15:20:36 -07002834out_free_tape:
2835 kfree(tape);
2836failed:
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02002837 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002838}
2839
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002840static void __exit idetape_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002841{
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02002842 driver_unregister(&idetape_driver.gen_driver);
Will Dysond5dee802005-09-16 02:55:07 -07002843 class_destroy(idetape_sysfs_class);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002844 unregister_chrdev(IDETAPE_MAJOR, "ht");
2845}
2846
Bartlomiej Zolnierkiewicz17514e82005-11-19 22:24:35 +01002847static int __init idetape_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002848{
Will Dysond5dee802005-09-16 02:55:07 -07002849 int error = 1;
2850 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2851 if (IS_ERR(idetape_sysfs_class)) {
2852 idetape_sysfs_class = NULL;
2853 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2854 error = -EBUSY;
2855 goto out;
2856 }
2857
Linus Torvalds1da177e2005-04-16 15:20:36 -07002858 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
Borislav Petkov5a04cfa2008-02-06 02:57:54 +01002859 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2860 " interface\n");
Will Dysond5dee802005-09-16 02:55:07 -07002861 error = -EBUSY;
2862 goto out_free_class;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002863 }
Will Dysond5dee802005-09-16 02:55:07 -07002864
2865 error = driver_register(&idetape_driver.gen_driver);
2866 if (error)
2867 goto out_free_driver;
2868
2869 return 0;
2870
2871out_free_driver:
2872 driver_unregister(&idetape_driver.gen_driver);
2873out_free_class:
2874 class_destroy(idetape_sysfs_class);
2875out:
2876 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002877}
2878
Kay Sievers263756e2005-12-12 18:03:44 +01002879MODULE_ALIAS("ide:*m-tape*");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002880module_init(idetape_init);
2881module_exit(idetape_exit);
2882MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
Borislav Petkov9c145762008-02-06 02:57:54 +01002883MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2884MODULE_LICENSE("GPL");