1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) ST-Ericsson SA 2010
4 *
5 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/io.h>
11 #include <linux/module.h>
12 #include <linux/random.h>
13 #include <linux/slab.h>
14 #include <linux/of.h>
15 #include <linux/of_address.h>
16 #include <linux/sys_soc.h>
17
18 #include <asm/cputype.h>
19 #include <asm/tlbflush.h>
20 #include <asm/cacheflush.h>
21 #include <asm/mach/map.h>
22
23 /**
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 */
29 struct dbx500_asic_id {
30 u16 partnumber;
31 u8 revision;
32 u8 process;
33 };
34
35 static struct dbx500_asic_id dbx500_id;
36
ux500_read_asicid(phys_addr_t addr)37 static unsigned int __init ux500_read_asicid(phys_addr_t addr)
38 {
39 void __iomem *virt = ioremap(addr, 4);
40 unsigned int asicid;
41
42 if (!virt)
43 return 0;
44
45 asicid = readl(virt);
46 iounmap(virt);
47
48 return asicid;
49 }
50
ux500_print_soc_info(unsigned int asicid)51 static void ux500_print_soc_info(unsigned int asicid)
52 {
53 unsigned int rev = dbx500_id.revision;
54
55 pr_info("DB%4x ", dbx500_id.partnumber);
56
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
partnumber(unsigned int asicid)67 static 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
78 * DB8520v2.2 0x412fc091 0x9001DBF4 0x008500B2
79 * DB5500v1 0x412fc091 0x9001FFF4 0x005500A0
80 * DB9540 0x413fc090 0xFFFFDBF4 0x009540xx
81 */
82
ux500_setup_id(void)83 static void __init ux500_setup_id(void)
84 {
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
95 case 0x412fc091: /* DB8520 / DB8500v2 / DB5500v1 */
96 asicid = ux500_read_asicid(0x9001DBF4);
97 if (partnumber(asicid) == 0x8500 ||
98 partnumber(asicid) == 0x8520)
99 /* DB8500v2 */
100 break;
101
102 /* DB5500v1 */
103 addr = 0x9001FFF4;
104 break;
105
106 case 0x413fc090: /* DB9540 */
107 addr = 0xFFFFDBF4;
108 break;
109 }
110
111 if (addr)
112 asicid = ux500_read_asicid(addr);
113
114 if (!asicid) {
115 pr_err("Unable to identify SoC\n");
116 BUG();
117 }
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 }
125
ux500_get_machine(void)126 static const char * __init ux500_get_machine(void)
127 {
128 return kasprintf(GFP_KERNEL, "DB%4x", dbx500_id.partnumber);
129 }
130
ux500_get_family(void)131 static const char * __init ux500_get_family(void)
132 {
133 return kasprintf(GFP_KERNEL, "ux500");
134 }
135
ux500_get_revision(void)136 static 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
149 static ssize_t
process_show(struct device * dev,struct device_attribute * attr,char * buf)150 process_show(struct device *dev, struct device_attribute *attr, char *buf)
151 {
152 if (dbx500_id.process == 0x00)
153 return sprintf(buf, "Standard\n");
154
155 return sprintf(buf, "%02xnm\n", dbx500_id.process);
156 }
157
158 static DEVICE_ATTR_RO(process);
159
160 static struct attribute *ux500_soc_attrs[] = {
161 &dev_attr_process.attr,
162 NULL
163 };
164
165 ATTRIBUTE_GROUPS(ux500_soc);
166
db8500_read_soc_id(struct device_node * backupram)167 static const char *db8500_read_soc_id(struct device_node *backupram)
168 {
169 void __iomem *base;
170 const char *retstr;
171 u32 uid[5];
172
173 base = of_iomap(backupram, 0);
174 if (!base)
175 return NULL;
176 memcpy_fromio(uid, base + 0x1fc0, sizeof(uid));
177
178 /* Throw these device-specific numbers into the entropy pool */
179 add_device_randomness(uid, sizeof(uid));
180 retstr = kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",
181 uid[0], uid[1], uid[2], uid[3], uid[4]);
182 iounmap(base);
183 return retstr;
184 }
185
soc_info_populate(struct soc_device_attribute * soc_dev_attr,struct device_node * backupram)186 static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
187 struct device_node *backupram)
188 {
189 soc_dev_attr->soc_id = db8500_read_soc_id(backupram);
190 soc_dev_attr->machine = ux500_get_machine();
191 soc_dev_attr->family = ux500_get_family();
192 soc_dev_attr->revision = ux500_get_revision();
193 soc_dev_attr->custom_attr_group = ux500_soc_groups[0];
194 }
195
ux500_soc_device_init(void)196 static int __init ux500_soc_device_init(void)
197 {
198 struct soc_device *soc_dev;
199 struct soc_device_attribute *soc_dev_attr;
200 struct device_node *backupram;
201
202 backupram = of_find_compatible_node(NULL, NULL, "ste,dbx500-backupram");
203 if (!backupram)
204 return 0;
205
206 ux500_setup_id();
207
208 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
209 if (!soc_dev_attr) {
210 of_node_put(backupram);
211 return -ENOMEM;
212 }
213
214 soc_info_populate(soc_dev_attr, backupram);
215 of_node_put(backupram);
216
217 soc_dev = soc_device_register(soc_dev_attr);
218 if (IS_ERR(soc_dev)) {
219 kfree(soc_dev_attr);
220 return PTR_ERR(soc_dev);
221 }
222
223 return 0;
224 }
225 subsys_initcall(ux500_soc_device_init);
226