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Rabin Vincentabf12d72010-12-08 11:07:59 +05301/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
5 * License terms: GNU General Public License (GPL) version 2
6 */
7
8#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/io.h>
Arnd Bergmann18a99272016-06-22 16:32:36 +020011#include <linux/module.h>
Arnd Bergmanncd1dc432016-06-20 23:01:26 +020012#include <linux/random.h>
13#include <linux/slab.h>
Arnd Bergmann18a99272016-06-22 16:32:36 +020014#include <linux/of.h>
15#include <linux/of_address.h>
Arnd Bergmanncd1dc432016-06-20 23:01:26 +020016#include <linux/sys_soc.h>
Rabin Vincentabf12d72010-12-08 11:07:59 +053017
18#include <asm/cputype.h>
19#include <asm/tlbflush.h>
20#include <asm/cacheflush.h>
21#include <asm/mach/map.h>
22
Arnd Bergmanncd1dc432016-06-20 23:01:26 +020023/**
24 * struct dbx500_asic_id - fields of the ASIC ID
25 * @process: the manufacturing process, 0x40 is 40 nm 0x00 is "standard"
26 * @partnumber: hithereto 0x8500 for DB8500
27 * @revision: version code in the series
28 */
29struct dbx500_asic_id {
30 u16 partnumber;
31 u8 revision;
32 u8 process;
33};
34
35static struct dbx500_asic_id dbx500_id;
Rabin Vincentabf12d72010-12-08 11:07:59 +053036
Arnd Bergmann080e0432013-05-31 22:47:04 +020037static unsigned int __init ux500_read_asicid(phys_addr_t addr)
Rabin Vincentabf12d72010-12-08 11:07:59 +053038{
Arnd Bergmannf15601d2016-06-20 23:21:20 +020039 void __iomem *virt = ioremap(addr, 4);
40 unsigned int asicid;
Rabin Vincentabf12d72010-12-08 11:07:59 +053041
Arnd Bergmannf15601d2016-06-20 23:21:20 +020042 if (!virt)
43 return 0;
Rabin Vincentabf12d72010-12-08 11:07:59 +053044
Arnd Bergmannf15601d2016-06-20 23:21:20 +020045 asicid = readl(virt);
46 iounmap(virt);
Rabin Vincentabf12d72010-12-08 11:07:59 +053047
Arnd Bergmannf15601d2016-06-20 23:21:20 +020048 return asicid;
Rabin Vincentabf12d72010-12-08 11:07:59 +053049}
50
51static void ux500_print_soc_info(unsigned int asicid)
52{
Arnd Bergmanncd1dc432016-06-20 23:01:26 +020053 unsigned int rev = dbx500_id.revision;
Rabin Vincentabf12d72010-12-08 11:07:59 +053054
Arnd Bergmanncd1dc432016-06-20 23:01:26 +020055 pr_info("DB%4x ", dbx500_id.partnumber);
Rabin Vincentabf12d72010-12-08 11:07:59 +053056
57 if (rev == 0x01)
58 pr_cont("Early Drop");
59 else if (rev >= 0xA0)
60 pr_cont("v%d.%d" , (rev >> 4) - 0xA + 1, rev & 0xf);
61 else
62 pr_cont("Unknown");
63
64 pr_cont(" [%#010x]\n", asicid);
65}
66
67static unsigned int partnumber(unsigned int asicid)
68{
69 return (asicid >> 8) & 0xffff;
70}
71
72/*
73 * SOC MIDR ASICID ADDRESS ASICID VALUE
74 * DB8500ed 0x410fc090 0x9001FFF4 0x00850001
75 * DB8500v1 0x411fc091 0x9001FFF4 0x008500A0
76 * DB8500v1.1 0x411fc091 0x9001FFF4 0x008500A1
77 * DB8500v2 0x412fc091 0x9001DBF4 0x008500B0
Rabin Vincent41c34ae2011-12-15 11:08:22 +010078 * DB8520v2.2 0x412fc091 0x9001DBF4 0x008500B2
Rabin Vincentabf12d72010-12-08 11:07:59 +053079 * DB5500v1 0x412fc091 0x9001FFF4 0x005500A0
Linus Walleijbc71c092012-01-23 11:54:44 +010080 * DB9540 0x413fc090 0xFFFFDBF4 0x009540xx
Rabin Vincentabf12d72010-12-08 11:07:59 +053081 */
82
Arnd Bergmannf15601d2016-06-20 23:21:20 +020083static void __init ux500_setup_id(void)
Rabin Vincentabf12d72010-12-08 11:07:59 +053084{
85 unsigned int cpuid = read_cpuid_id();
86 unsigned int asicid = 0;
87 phys_addr_t addr = 0;
88
89 switch (cpuid) {
90 case 0x410fc090: /* DB8500ed */
91 case 0x411fc091: /* DB8500v1 */
92 addr = 0x9001FFF4;
93 break;
94
Rabin Vincent41c34ae2011-12-15 11:08:22 +010095 case 0x412fc091: /* DB8520 / DB8500v2 / DB5500v1 */
Rabin Vincentabf12d72010-12-08 11:07:59 +053096 asicid = ux500_read_asicid(0x9001DBF4);
Rabin Vincent41c34ae2011-12-15 11:08:22 +010097 if (partnumber(asicid) == 0x8500 ||
98 partnumber(asicid) == 0x8520)
Rabin Vincentabf12d72010-12-08 11:07:59 +053099 /* DB8500v2 */
100 break;
101
102 /* DB5500v1 */
103 addr = 0x9001FFF4;
104 break;
Linus Walleijbc71c092012-01-23 11:54:44 +0100105
106 case 0x413fc090: /* DB9540 */
107 addr = 0xFFFFDBF4;
108 break;
Rabin Vincentabf12d72010-12-08 11:07:59 +0530109 }
110
111 if (addr)
112 asicid = ux500_read_asicid(addr);
113
114 if (!asicid) {
115 pr_err("Unable to identify SoC\n");
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200116 BUG();
Rabin Vincentabf12d72010-12-08 11:07:59 +0530117 }
118
119 dbx500_id.process = asicid >> 24;
120 dbx500_id.partnumber = partnumber(asicid);
121 dbx500_id.revision = asicid & 0xff;
122
123 ux500_print_soc_info(asicid);
124}
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200125
126static const char * __init ux500_get_machine(void)
127{
128 return kasprintf(GFP_KERNEL, "DB%4x", dbx500_id.partnumber);
129}
130
131static const char * __init ux500_get_family(void)
132{
133 return kasprintf(GFP_KERNEL, "ux500");
134}
135
136static const char * __init ux500_get_revision(void)
137{
138 unsigned int rev = dbx500_id.revision;
139
140 if (rev == 0x01)
141 return kasprintf(GFP_KERNEL, "%s", "ED");
142 else if (rev >= 0xA0)
143 return kasprintf(GFP_KERNEL, "%d.%d",
144 (rev >> 4) - 0xA + 1, rev & 0xf);
145
146 return kasprintf(GFP_KERNEL, "%s", "Unknown");
147}
148
149static ssize_t ux500_get_process(struct device *dev,
150 struct device_attribute *attr,
151 char *buf)
152{
153 if (dbx500_id.process == 0x00)
154 return sprintf(buf, "Standard\n");
155
156 return sprintf(buf, "%02xnm\n", dbx500_id.process);
157}
158
Arnd Bergmann18a99272016-06-22 16:32:36 +0200159static const char *db8500_read_soc_id(struct device_node *backupram)
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200160{
Arnd Bergmann18a99272016-06-22 16:32:36 +0200161 void __iomem *base;
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200162 void __iomem *uid;
163 const char *retstr;
164
Arnd Bergmann18a99272016-06-22 16:32:36 +0200165 base = of_iomap(backupram, 0);
166 if (!base)
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200167 return NULL;
Arnd Bergmann18a99272016-06-22 16:32:36 +0200168 uid = base + 0x1fc0;
169
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200170 /* Throw these device-specific numbers into the entropy pool */
171 add_device_randomness(uid, 0x14);
172 retstr = kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",
173 readl((u32 *)uid+0),
174 readl((u32 *)uid+1), readl((u32 *)uid+2),
175 readl((u32 *)uid+3), readl((u32 *)uid+4));
Arnd Bergmann18a99272016-06-22 16:32:36 +0200176 iounmap(base);
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200177 return retstr;
178}
179
Arnd Bergmann18a99272016-06-22 16:32:36 +0200180static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
181 struct device_node *backupram)
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200182{
Arnd Bergmann18a99272016-06-22 16:32:36 +0200183 soc_dev_attr->soc_id = db8500_read_soc_id(backupram);
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200184 soc_dev_attr->machine = ux500_get_machine();
185 soc_dev_attr->family = ux500_get_family();
186 soc_dev_attr->revision = ux500_get_revision();
187}
188
189static const struct device_attribute ux500_soc_attr =
190 __ATTR(process, S_IRUGO, ux500_get_process, NULL);
191
Arnd Bergmann18a99272016-06-22 16:32:36 +0200192static int __init ux500_soc_device_init(void)
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200193{
194 struct device *parent;
195 struct soc_device *soc_dev;
196 struct soc_device_attribute *soc_dev_attr;
Arnd Bergmann18a99272016-06-22 16:32:36 +0200197 struct device_node *backupram;
198
199 backupram = of_find_compatible_node(NULL, NULL, "ste,dbx500-backupram");
200 if (!backupram)
201 return 0;
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200202
Arnd Bergmannf15601d2016-06-20 23:21:20 +0200203 ux500_setup_id();
204
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200205 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
206 if (!soc_dev_attr)
Arnd Bergmann18a99272016-06-22 16:32:36 +0200207 return -ENOMEM;
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200208
Arnd Bergmann18a99272016-06-22 16:32:36 +0200209 soc_info_populate(soc_dev_attr, backupram);
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200210
211 soc_dev = soc_device_register(soc_dev_attr);
212 if (IS_ERR(soc_dev)) {
213 kfree(soc_dev_attr);
Arnd Bergmann18a99272016-06-22 16:32:36 +0200214 return PTR_ERR(soc_dev);
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200215 }
216
217 parent = soc_device_to_device(soc_dev);
218 device_create_file(parent, &ux500_soc_attr);
219
Arnd Bergmann18a99272016-06-22 16:32:36 +0200220 return 0;
Arnd Bergmanncd1dc432016-06-20 23:01:26 +0200221}
Arnd Bergmann18a99272016-06-22 16:32:36 +0200222subsys_initcall(ux500_soc_device_init);