Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * 6522 Versatile Interface Adapter (VIA) |
| 3 | * |
| 4 | * There are two of these on the Mac II. Some IRQ's are vectored |
| 5 | * via them as are assorted bits and bobs - eg RTC, ADB. |
| 6 | * |
| 7 | * CSA: Motorola seems to have removed documentation on the 6522 from |
| 8 | * their web site; try |
| 9 | * http://nerini.drf.com/vectrex/other/text/chips/6522/ |
| 10 | * http://www.zymurgy.net/classic/vic20/vicdet1.htm |
| 11 | * and |
| 12 | * http://193.23.168.87/mikro_laborversuche/via_iobaustein/via6522_1.html |
| 13 | * for info. A full-text web search on 6522 AND VIA will probably also |
| 14 | * net some usefulness. <cananian@alumni.princeton.edu> 20apr1999 |
| 15 | * |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 16 | * Additional data is here (the SY6522 was used in the Mac II etc): |
| 17 | * http://www.6502.org/documents/datasheets/synertek/synertek_sy6522.pdf |
| 18 | * http://www.6502.org/documents/datasheets/synertek/synertek_sy6522_programming_reference.pdf |
| 19 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | * PRAM/RTC access algorithms are from the NetBSD RTC toolkit version 1.08b |
| 21 | * by Erik Vogan and adapted to Linux by Joshua M. Thompson (funaho@jurai.org) |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/mm.h> |
| 28 | #include <linux/delay.h> |
| 29 | #include <linux/init.h> |
| 30 | #include <linux/ide.h> |
| 31 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <asm/bootinfo.h> |
| 33 | #include <asm/macintosh.h> |
| 34 | #include <asm/macints.h> |
| 35 | #include <asm/machw.h> |
| 36 | #include <asm/mac_via.h> |
| 37 | #include <asm/mac_psc.h> |
| 38 | |
| 39 | volatile __u8 *via1, *via2; |
| 40 | #if 0 |
| 41 | /* See note in mac_via.h about how this is possibly not useful */ |
| 42 | volatile long *via_memory_bogon=(long *)&via_memory_bogon; |
| 43 | #endif |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 44 | int rbv_present, via_alt_mapping; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | __u8 rbv_clear; |
| 46 | |
| 47 | /* |
| 48 | * Globals for accessing the VIA chip registers without having to |
| 49 | * check if we're hitting a real VIA or an RBV. Normally you could |
| 50 | * just hit the combined register (ie, vIER|rIER) but that seems to |
| 51 | * break on AV Macs...probably because they actually decode more than |
| 52 | * eight address bits. Why can't Apple engineers at least be |
| 53 | * _consistently_ lazy? - 1999-05-21 (jmt) |
| 54 | */ |
| 55 | |
| 56 | static int gIER,gIFR,gBufA,gBufB; |
| 57 | |
| 58 | /* |
| 59 | * Timer defs. |
| 60 | */ |
| 61 | |
| 62 | #define TICK_SIZE 10000 |
| 63 | #define MAC_CLOCK_TICK (783300/HZ) /* ticks per HZ */ |
| 64 | #define MAC_CLOCK_LOW (MAC_CLOCK_TICK&0xFF) |
| 65 | #define MAC_CLOCK_HIGH (MAC_CLOCK_TICK>>8) |
| 66 | |
| 67 | static int nubus_active; |
| 68 | |
| 69 | void via_debug_dump(void); |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 70 | irqreturn_t via1_irq(int, void *); |
| 71 | irqreturn_t via2_irq(int, void *); |
| 72 | irqreturn_t via_nubus_irq(int, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | void via_irq_enable(int irq); |
| 74 | void via_irq_disable(int irq); |
| 75 | void via_irq_clear(int irq); |
| 76 | |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 77 | extern irqreturn_t mac_scc_dispatch(int, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | extern int oss_present; |
| 79 | |
| 80 | /* |
| 81 | * Initialize the VIAs |
| 82 | * |
| 83 | * First we figure out where they actually _are_ as well as what type of |
| 84 | * VIA we have for VIA2 (it could be a real VIA or an RBV or even an OSS.) |
| 85 | * Then we pretty much clear them out and disable all IRQ sources. |
| 86 | * |
| 87 | * Note: the OSS is actually "detected" here and not in oss_init(). It just |
| 88 | * seems more logical to do it here since via_init() needs to know |
| 89 | * these things anyways. |
| 90 | */ |
| 91 | |
| 92 | void __init via_init(void) |
| 93 | { |
| 94 | switch(macintosh_config->via_type) { |
| 95 | |
| 96 | /* IIci, IIsi, IIvx, IIvi (P6xx), LC series */ |
| 97 | |
| 98 | case MAC_VIA_IIci: |
| 99 | via1 = (void *) VIA1_BASE; |
| 100 | if (macintosh_config->ident == MAC_MODEL_IIFX) { |
| 101 | via2 = NULL; |
| 102 | rbv_present = 0; |
| 103 | oss_present = 1; |
| 104 | } else { |
| 105 | via2 = (void *) RBV_BASE; |
| 106 | rbv_present = 1; |
| 107 | oss_present = 0; |
| 108 | } |
| 109 | if (macintosh_config->ident == MAC_MODEL_LCIII) { |
| 110 | rbv_clear = 0x00; |
| 111 | } else { |
| 112 | /* on most RBVs (& unlike the VIAs), you */ |
| 113 | /* need to set bit 7 when you write to IFR */ |
| 114 | /* in order for your clear to occur. */ |
| 115 | rbv_clear = 0x80; |
| 116 | } |
| 117 | gIER = rIER; |
| 118 | gIFR = rIFR; |
| 119 | gBufA = rSIFR; |
| 120 | gBufB = rBufB; |
| 121 | break; |
| 122 | |
| 123 | /* Quadra and early MacIIs agree on the VIA locations */ |
| 124 | |
| 125 | case MAC_VIA_QUADRA: |
| 126 | case MAC_VIA_II: |
| 127 | via1 = (void *) VIA1_BASE; |
| 128 | via2 = (void *) VIA2_BASE; |
| 129 | rbv_present = 0; |
| 130 | oss_present = 0; |
| 131 | rbv_clear = 0x00; |
| 132 | gIER = vIER; |
| 133 | gIFR = vIFR; |
| 134 | gBufA = vBufA; |
| 135 | gBufB = vBufB; |
| 136 | break; |
| 137 | default: |
| 138 | panic("UNKNOWN VIA TYPE"); |
| 139 | } |
| 140 | |
| 141 | printk(KERN_INFO "VIA1 at %p is a 6522 or clone\n", via1); |
| 142 | |
| 143 | printk(KERN_INFO "VIA2 at %p is ", via2); |
| 144 | if (rbv_present) { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 145 | printk("an RBV\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | } else if (oss_present) { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 147 | printk("an OSS\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } else { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 149 | printk("a 6522 or clone\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | #ifdef DEBUG_VIA |
| 153 | via_debug_dump(); |
| 154 | #endif |
| 155 | |
| 156 | /* |
| 157 | * Shut down all IRQ sources, reset the timers, and |
| 158 | * kill the timer latch on VIA1. |
| 159 | */ |
| 160 | |
| 161 | via1[vIER] = 0x7F; |
| 162 | via1[vIFR] = 0x7F; |
| 163 | via1[vT1LL] = 0; |
| 164 | via1[vT1LH] = 0; |
| 165 | via1[vT1CL] = 0; |
| 166 | via1[vT1CH] = 0; |
| 167 | via1[vT2CL] = 0; |
| 168 | via1[vT2CH] = 0; |
| 169 | via1[vACR] &= 0x3F; |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 170 | via1[vACR] &= ~0x03; /* disable port A & B latches */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
| 172 | /* |
| 173 | * SE/30: disable video IRQ |
| 174 | * XXX: testing for SE/30 VBL |
| 175 | */ |
| 176 | |
| 177 | if (macintosh_config->ident == MAC_MODEL_SE30) { |
| 178 | via1[vDirB] |= 0x40; |
| 179 | via1[vBufB] |= 0x40; |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Set the RTC bits to a known state: all lines to outputs and |
| 184 | * RTC disabled (yes that's 0 to enable and 1 to disable). |
| 185 | */ |
| 186 | |
| 187 | via1[vDirB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData); |
| 188 | via1[vBufB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk); |
| 189 | |
| 190 | /* Everything below this point is VIA2/RBV only... */ |
| 191 | |
| 192 | if (oss_present) return; |
| 193 | |
| 194 | #if 1 |
| 195 | /* Some machines support an alternate IRQ mapping that spreads */ |
| 196 | /* Ethernet and Sound out to their own autolevel IRQs and moves */ |
| 197 | /* VIA1 to level 6. A/UX uses this mapping and we do too. Note */ |
| 198 | /* that the IIfx emulates this alternate mapping using the OSS. */ |
| 199 | |
| 200 | switch(macintosh_config->ident) { |
Finn Thain | e10e5c4 | 2007-05-01 22:32:52 +0200 | [diff] [blame] | 201 | case MAC_MODEL_P475: |
| 202 | case MAC_MODEL_P475F: |
| 203 | case MAC_MODEL_P575: |
| 204 | case MAC_MODEL_Q605: |
| 205 | case MAC_MODEL_Q605_ACC: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | case MAC_MODEL_C610: |
| 207 | case MAC_MODEL_Q610: |
Finn Thain | e10e5c4 | 2007-05-01 22:32:52 +0200 | [diff] [blame] | 208 | case MAC_MODEL_Q630: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | case MAC_MODEL_C650: |
| 210 | case MAC_MODEL_Q650: |
| 211 | case MAC_MODEL_Q700: |
| 212 | case MAC_MODEL_Q800: |
| 213 | case MAC_MODEL_Q900: |
| 214 | case MAC_MODEL_Q950: |
| 215 | via_alt_mapping = 1; |
| 216 | via1[vDirB] |= 0x40; |
| 217 | via1[vBufB] &= ~0x40; |
| 218 | break; |
| 219 | default: |
| 220 | via_alt_mapping = 0; |
| 221 | break; |
| 222 | } |
| 223 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | via_alt_mapping = 0; |
| 225 | #endif |
| 226 | |
| 227 | /* |
| 228 | * Now initialize VIA2. For RBV we just kill all interrupts; |
| 229 | * for a regular VIA we also reset the timers and stuff. |
| 230 | */ |
| 231 | |
| 232 | via2[gIER] = 0x7F; |
| 233 | via2[gIFR] = 0x7F | rbv_clear; |
| 234 | if (!rbv_present) { |
| 235 | via2[vT1LL] = 0; |
| 236 | via2[vT1LH] = 0; |
| 237 | via2[vT1CL] = 0; |
| 238 | via2[vT1CH] = 0; |
| 239 | via2[vT2CL] = 0; |
| 240 | via2[vT2CH] = 0; |
| 241 | via2[vACR] &= 0x3F; |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 242 | via2[vACR] &= ~0x03; /* disable port A & B latches */ |
| 243 | } |
| 244 | |
| 245 | /* |
| 246 | * Set vPCR for SCSI interrupts (but not on RBV) |
| 247 | */ |
| 248 | if (!rbv_present) { |
| 249 | if (macintosh_config->scsi_type == MAC_SCSI_OLD) { |
| 250 | /* CB2 (IRQ) indep. input, positive edge */ |
| 251 | /* CA2 (DRQ) indep. input, positive edge */ |
| 252 | via2[vPCR] = 0x66; |
| 253 | } else { |
| 254 | /* CB2 (IRQ) indep. input, negative edge */ |
| 255 | /* CA2 (DRQ) indep. input, negative edge */ |
| 256 | via2[vPCR] = 0x22; |
| 257 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | } |
| 259 | } |
| 260 | |
| 261 | /* |
| 262 | * Start the 100 Hz clock |
| 263 | */ |
| 264 | |
David Howells | 40220c1 | 2006-10-09 12:19:47 +0100 | [diff] [blame] | 265 | void __init via_init_clock(irq_handler_t func) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | { |
| 267 | via1[vACR] |= 0x40; |
| 268 | via1[vT1LL] = MAC_CLOCK_LOW; |
| 269 | via1[vT1LH] = MAC_CLOCK_HIGH; |
| 270 | via1[vT1CL] = MAC_CLOCK_LOW; |
| 271 | via1[vT1CH] = MAC_CLOCK_HIGH; |
| 272 | |
| 273 | request_irq(IRQ_MAC_TIMER_1, func, IRQ_FLG_LOCK, "timer", func); |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * Register the interrupt dispatchers for VIA or RBV machines only. |
| 278 | */ |
| 279 | |
| 280 | void __init via_register_interrupts(void) |
| 281 | { |
| 282 | if (via_alt_mapping) { |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 283 | request_irq(IRQ_AUTO_1, via1_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "software", |
| 285 | (void *) via1); |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 286 | request_irq(IRQ_AUTO_6, via1_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1", |
| 288 | (void *) via1); |
| 289 | } else { |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 290 | request_irq(IRQ_AUTO_1, via1_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1", |
| 292 | (void *) via1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | } |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 294 | request_irq(IRQ_AUTO_2, via2_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | "via2", (void *) via2); |
| 296 | if (!psc_present) { |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 297 | request_irq(IRQ_AUTO_4, mac_scc_dispatch, IRQ_FLG_LOCK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | "scc", mac_scc_dispatch); |
| 299 | } |
| 300 | request_irq(IRQ_MAC_NUBUS, via_nubus_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, |
| 301 | "nubus", (void *) via2); |
| 302 | } |
| 303 | |
| 304 | /* |
| 305 | * Debugging dump, used in various places to see what's going on. |
| 306 | */ |
| 307 | |
| 308 | void via_debug_dump(void) |
| 309 | { |
| 310 | printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", |
| 311 | (uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]); |
| 312 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", |
| 313 | (uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]); |
| 314 | if (oss_present) { |
| 315 | printk(KERN_DEBUG "VIA2: <OSS>\n"); |
| 316 | } else if (rbv_present) { |
| 317 | printk(KERN_DEBUG "VIA2: IFR = 0x%02X IER = 0x%02X\n", |
| 318 | (uint) via2[rIFR], (uint) via2[rIER]); |
| 319 | printk(KERN_DEBUG " SIFR = 0x%02X SIER = 0x%02X\n", |
| 320 | (uint) via2[rSIFR], (uint) via2[rSIER]); |
| 321 | } else { |
| 322 | printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", |
| 323 | (uint) via2[vDirA], (uint) via2[vDirB], |
| 324 | (uint) via2[vACR]); |
| 325 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", |
| 326 | (uint) via2[vPCR], |
| 327 | (uint) via2[vIFR], (uint) via2[vIER]); |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * This is always executed with interrupts disabled. |
| 333 | * |
| 334 | * TBI: get time offset between scheduling timer ticks |
| 335 | */ |
| 336 | |
| 337 | unsigned long mac_gettimeoffset (void) |
| 338 | { |
| 339 | unsigned long ticks, offset = 0; |
| 340 | |
| 341 | /* read VIA1 timer 2 current value */ |
| 342 | ticks = via1[vT1CL] | (via1[vT1CH] << 8); |
| 343 | /* The probability of underflow is less than 2% */ |
| 344 | if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50) |
| 345 | /* Check for pending timer interrupt in VIA1 IFR */ |
| 346 | if (via1[vIFR] & 0x40) offset = TICK_SIZE; |
| 347 | |
| 348 | ticks = MAC_CLOCK_TICK - ticks; |
| 349 | ticks = ticks * 10000L / MAC_CLOCK_TICK; |
| 350 | |
| 351 | return ticks + offset; |
| 352 | } |
| 353 | |
| 354 | /* |
| 355 | * Flush the L2 cache on Macs that have it by flipping |
| 356 | * the system into 24-bit mode for an instant. |
| 357 | */ |
| 358 | |
| 359 | void via_flush_cache(void) |
| 360 | { |
| 361 | via2[gBufB] &= ~VIA2B_vMode32; |
| 362 | via2[gBufB] |= VIA2B_vMode32; |
| 363 | } |
| 364 | |
| 365 | /* |
| 366 | * Return the status of the L2 cache on a IIci |
| 367 | */ |
| 368 | |
| 369 | int via_get_cache_disable(void) |
| 370 | { |
| 371 | /* Safeguard against being called accidentally */ |
| 372 | if (!via2) { |
| 373 | printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n"); |
| 374 | return 1; |
| 375 | } |
| 376 | |
| 377 | return (int) via2[gBufB] & VIA2B_vCDis; |
| 378 | } |
| 379 | |
| 380 | /* |
| 381 | * Initialize VIA2 for Nubus access |
| 382 | */ |
| 383 | |
| 384 | void __init via_nubus_init(void) |
| 385 | { |
| 386 | /* don't set nubus_active = 0 here, it kills the Baboon */ |
| 387 | /* interrupt that we've already registered. */ |
| 388 | |
| 389 | /* unlock nubus transactions */ |
| 390 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
| 392 | (macintosh_config->adb_type != MAC_ADB_PB2)) { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 393 | /* set the line to be an output on non-RBV machines */ |
| 394 | if (!rbv_present) |
| 395 | via2[vDirB] |= 0x02; |
| 396 | |
| 397 | /* this seems to be an ADB bit on PMU machines */ |
| 398 | /* according to MkLinux. -- jmt */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | via2[gBufB] |= 0x02; |
| 400 | } |
| 401 | |
| 402 | /* disable nubus slot interrupts. */ |
| 403 | if (rbv_present) { |
| 404 | via2[rSIER] = 0x7F; |
| 405 | via2[rSIER] = nubus_active | 0x80; |
| 406 | } else { |
| 407 | /* These are ADB bits on PMU */ |
| 408 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
| 409 | (macintosh_config->adb_type != MAC_ADB_PB2)) { |
| 410 | switch(macintosh_config->ident) |
| 411 | { |
| 412 | case MAC_MODEL_II: |
| 413 | case MAC_MODEL_IIX: |
| 414 | case MAC_MODEL_IICX: |
| 415 | case MAC_MODEL_SE30: |
| 416 | via2[vBufA] |= 0x3F; |
| 417 | via2[vDirA] = ~nubus_active | 0xc0; |
| 418 | break; |
| 419 | default: |
| 420 | via2[vBufA] = 0xFF; |
| 421 | via2[vDirA] = ~nubus_active; |
| 422 | } |
| 423 | } |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * The generic VIA interrupt routines (shamelessly stolen from Alan Cox's |
| 429 | * via6522.c :-), disable/pending masks added. |
| 430 | * |
| 431 | * The new interrupt architecture in macints.c takes care of a lot of the |
| 432 | * gruntwork for us, including tallying the interrupts and calling the |
| 433 | * handlers on the linked list. All we need to do here is basically generate |
| 434 | * the machspec interrupt number after clearing the interrupt. |
| 435 | */ |
| 436 | |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 437 | irqreturn_t via1_irq(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 439 | int irq_num; |
| 440 | unsigned char irq_bit, events; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 442 | events = via1[vIFR] & via1[vIER] & 0x7F; |
| 443 | if (!events) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | return IRQ_NONE; |
| 445 | |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 446 | irq_num = VIA1_SOURCE_BASE; |
| 447 | irq_bit = 1; |
| 448 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | if (events & irq_bit) { |
| 450 | via1[vIER] = irq_bit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | via1[vIFR] = irq_bit; |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 452 | m68k_handle_int(irq_num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | via1[vIER] = irq_bit | 0x80; |
| 454 | } |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 455 | ++irq_num; |
| 456 | irq_bit <<= 1; |
| 457 | } while (events >= irq_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | |
| 459 | #if 0 /* freakin' pmu is doing weird stuff */ |
| 460 | if (!oss_present) { |
| 461 | /* This (still) seems to be necessary to get IDE |
| 462 | working. However, if you enable VBL interrupts, |
| 463 | you're screwed... */ |
| 464 | /* FIXME: should we check the SLOTIRQ bit before |
| 465 | pulling this stunt? */ |
| 466 | /* No, it won't be set. that's why we're doing this. */ |
| 467 | via_irq_disable(IRQ_MAC_NUBUS); |
| 468 | via_irq_clear(IRQ_MAC_NUBUS); |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 469 | m68k_handle_int(IRQ_MAC_NUBUS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | via_irq_enable(IRQ_MAC_NUBUS); |
| 471 | } |
| 472 | #endif |
| 473 | return IRQ_HANDLED; |
| 474 | } |
| 475 | |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 476 | irqreturn_t via2_irq(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 478 | int irq_num; |
| 479 | unsigned char irq_bit, events; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 481 | events = via2[gIFR] & via2[gIER] & 0x7F; |
| 482 | if (!events) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | return IRQ_NONE; |
| 484 | |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 485 | irq_num = VIA2_SOURCE_BASE; |
| 486 | irq_bit = 1; |
| 487 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | if (events & irq_bit) { |
| 489 | via2[gIER] = irq_bit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | via2[gIFR] = irq_bit | rbv_clear; |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 491 | m68k_handle_int(irq_num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | via2[gIER] = irq_bit | 0x80; |
| 493 | } |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 494 | ++irq_num; |
| 495 | irq_bit <<= 1; |
| 496 | } while (events >= irq_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | return IRQ_HANDLED; |
| 498 | } |
| 499 | |
| 500 | /* |
| 501 | * Dispatch Nubus interrupts. We are called as a secondary dispatch by the |
| 502 | * VIA2 dispatcher as a fast interrupt handler. |
| 503 | */ |
| 504 | |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 505 | irqreturn_t via_nubus_irq(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 507 | int slot_irq; |
| 508 | unsigned char slot_bit, events; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 510 | events = ~via2[gBufA] & 0x7F; |
| 511 | if (rbv_present) |
| 512 | events &= via2[rSIER]; |
| 513 | else |
| 514 | events &= nubus_active; |
| 515 | if (!events) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | return IRQ_NONE; |
| 517 | |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 518 | do { |
| 519 | slot_irq = IRQ_NUBUS_F; |
| 520 | slot_bit = 0x40; |
| 521 | do { |
| 522 | if (events & slot_bit) { |
| 523 | events &= ~slot_bit; |
| 524 | m68k_handle_int(slot_irq); |
| 525 | } |
| 526 | --slot_irq; |
| 527 | slot_bit >>= 1; |
| 528 | } while (events); |
| 529 | |
| 530 | /* clear the CA1 interrupt and make certain there's no more. */ |
| 531 | via2[gIFR] = 0x02 | rbv_clear; |
| 532 | events = ~via2[gBufA] & 0x7F; |
| 533 | if (rbv_present) |
| 534 | events &= via2[rSIER]; |
| 535 | else |
| 536 | events &= nubus_active; |
| 537 | } while (events); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | return IRQ_HANDLED; |
| 539 | } |
| 540 | |
| 541 | void via_irq_enable(int irq) { |
| 542 | int irq_src = IRQ_SRC(irq); |
| 543 | int irq_idx = IRQ_IDX(irq); |
| 544 | int irq_bit = 1 << irq_idx; |
| 545 | |
| 546 | #ifdef DEBUG_IRQUSE |
| 547 | printk(KERN_DEBUG "via_irq_enable(%d)\n", irq); |
| 548 | #endif |
| 549 | |
| 550 | if (irq_src == 1) { |
| 551 | via1[vIER] = irq_bit | 0x80; |
| 552 | } else if (irq_src == 2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | via2[gIER] = irq_bit | 0x80; |
| 554 | } else if (irq_src == 7) { |
Finn Thain | 1a23989 | 2006-06-23 02:04:59 -0700 | [diff] [blame] | 555 | nubus_active |= irq_bit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | if (rbv_present) { |
| 557 | /* enable the slot interrupt. SIER works like IER. */ |
| 558 | via2[rSIER] = IER_SET_BIT(irq_idx); |
| 559 | } else { |
| 560 | /* Make sure the bit is an input, to enable the irq */ |
| 561 | /* But not on PowerBooks, that's ADB... */ |
| 562 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
| 563 | (macintosh_config->adb_type != MAC_ADB_PB2)) { |
| 564 | switch(macintosh_config->ident) |
| 565 | { |
| 566 | case MAC_MODEL_II: |
| 567 | case MAC_MODEL_IIX: |
| 568 | case MAC_MODEL_IICX: |
| 569 | case MAC_MODEL_SE30: |
| 570 | via2[vDirA] &= (~irq_bit | 0xc0); |
| 571 | break; |
| 572 | default: |
| 573 | via2[vDirA] &= ~irq_bit; |
| 574 | } |
| 575 | } |
| 576 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | } |
| 578 | } |
| 579 | |
| 580 | void via_irq_disable(int irq) { |
| 581 | int irq_src = IRQ_SRC(irq); |
| 582 | int irq_idx = IRQ_IDX(irq); |
| 583 | int irq_bit = 1 << irq_idx; |
| 584 | |
| 585 | #ifdef DEBUG_IRQUSE |
| 586 | printk(KERN_DEBUG "via_irq_disable(%d)\n", irq); |
| 587 | #endif |
| 588 | |
| 589 | if (irq_src == 1) { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 590 | via1[vIER] = irq_bit & 0x7F; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | } else if (irq_src == 2) { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 592 | via2[gIER] = irq_bit & 0x7F; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | } else if (irq_src == 7) { |
| 594 | if (rbv_present) { |
| 595 | /* disable the slot interrupt. SIER works like IER. */ |
| 596 | via2[rSIER] = IER_CLR_BIT(irq_idx); |
| 597 | } else { |
| 598 | /* disable the nubus irq by changing dir to output */ |
| 599 | /* except on PMU */ |
| 600 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
| 601 | (macintosh_config->adb_type != MAC_ADB_PB2)) { |
| 602 | via2[vDirA] |= irq_bit; |
| 603 | } |
| 604 | } |
| 605 | nubus_active &= ~irq_bit; |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | void via_irq_clear(int irq) { |
| 610 | int irq_src = IRQ_SRC(irq); |
| 611 | int irq_idx = IRQ_IDX(irq); |
| 612 | int irq_bit = 1 << irq_idx; |
| 613 | |
| 614 | if (irq_src == 1) { |
| 615 | via1[vIFR] = irq_bit; |
| 616 | } else if (irq_src == 2) { |
| 617 | via2[gIFR] = irq_bit | rbv_clear; |
| 618 | } else if (irq_src == 7) { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 619 | /* FIXME: There is no way to clear an individual nubus slot |
| 620 | * IRQ flag, other than getting the device to do it. |
| 621 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | } |
| 623 | } |
| 624 | |
| 625 | /* |
| 626 | * Returns nonzero if an interrupt is pending on the given |
| 627 | * VIA/IRQ combination. |
| 628 | */ |
| 629 | |
| 630 | int via_irq_pending(int irq) |
| 631 | { |
| 632 | int irq_src = IRQ_SRC(irq); |
| 633 | int irq_idx = IRQ_IDX(irq); |
| 634 | int irq_bit = 1 << irq_idx; |
| 635 | |
| 636 | if (irq_src == 1) { |
| 637 | return via1[vIFR] & irq_bit; |
| 638 | } else if (irq_src == 2) { |
| 639 | return via2[gIFR] & irq_bit; |
| 640 | } else if (irq_src == 7) { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame^] | 641 | /* FIXME: this can't work while a slot irq is disabled! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | return ~via2[gBufA] & irq_bit; |
| 643 | } |
| 644 | return 0; |
| 645 | } |