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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>
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27
28
29struct dbx500_asic_id {
30 u16 partnumber;
31 u8 revision;
32 u8 process;
33};
34
35static struct dbx500_asic_id dbx500_id;
36
37static 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
51static 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
67static unsigned int partnumber(unsigned int asicid)
68{
69 return (asicid >> 8) & 0xffff;
70}
71
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82
83static 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:
91 case 0x411fc091:
92 addr = 0x9001FFF4;
93 break;
94
95 case 0x412fc091:
96 asicid = ux500_read_asicid(0x9001DBF4);
97 if (partnumber(asicid) == 0x8500 ||
98 partnumber(asicid) == 0x8520)
99
100 break;
101
102
103 addr = 0x9001FFF4;
104 break;
105
106 case 0x413fc090:
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
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
150process_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
158static DEVICE_ATTR_RO(process);
159
160static struct attribute *ux500_soc_attrs[] = {
161 &dev_attr_process.attr,
162 NULL
163};
164
165ATTRIBUTE_GROUPS(ux500_soc);
166
167static const char *db8500_read_soc_id(struct device_node *backupram)
168{
169 void __iomem *base;
170 void __iomem *uid;
171 const char *retstr;
172
173 base = of_iomap(backupram, 0);
174 if (!base)
175 return NULL;
176 uid = base + 0x1fc0;
177
178
179 add_device_randomness(uid, 0x14);
180 retstr = kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",
181 readl((u32 *)uid+0),
182 readl((u32 *)uid+1), readl((u32 *)uid+2),
183 readl((u32 *)uid+3), readl((u32 *)uid+4));
184 iounmap(base);
185 return retstr;
186}
187
188static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
189 struct device_node *backupram)
190{
191 soc_dev_attr->soc_id = db8500_read_soc_id(backupram);
192 soc_dev_attr->machine = ux500_get_machine();
193 soc_dev_attr->family = ux500_get_family();
194 soc_dev_attr->revision = ux500_get_revision();
195 soc_dev_attr->custom_attr_group = ux500_soc_groups[0];
196}
197
198static int __init ux500_soc_device_init(void)
199{
200 struct soc_device *soc_dev;
201 struct soc_device_attribute *soc_dev_attr;
202 struct device_node *backupram;
203
204 backupram = of_find_compatible_node(NULL, NULL, "ste,dbx500-backupram");
205 if (!backupram)
206 return 0;
207
208 ux500_setup_id();
209
210 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
211 if (!soc_dev_attr) {
212 of_node_put(backupram);
213 return -ENOMEM;
214 }
215
216 soc_info_populate(soc_dev_attr, backupram);
217 of_node_put(backupram);
218
219 soc_dev = soc_device_register(soc_dev_attr);
220 if (IS_ERR(soc_dev)) {
221 kfree(soc_dev_attr);
222 return PTR_ERR(soc_dev);
223 }
224
225 return 0;
226}
227subsys_initcall(ux500_soc_device_init);
228
