arch/arm/mach-ux500/id.c

   1 /*
   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>
  11 #include <linux/random.h>
  12 #include <linux/slab.h>
  13 #include <linux/sys_soc.h>
  14
  15 #include <asm/cputype.h>
  16 #include <asm/tlbflush.h>
  17 #include <asm/cacheflush.h>
  18 #include <asm/mach/map.h>
  19
  20 #include "setup.h"
  21
  22 #include "db8500-regs.h"
  23
  24 /**
  25  * struct dbx500_asic_id - fields of the ASIC ID
  26  * @process: the manufacturing process, 0x40 is 40 nm 0x00 is "standard"
  27  * @partnumber: hithereto 0x8500 for DB8500
  28  * @revision: version code in the series
  29  */
  30 struct dbx500_asic_id {
  31         u16     partnumber;
  32         u8      revision;
  33         u8      process;
  34 };
  35
  36 static struct dbx500_asic_id dbx500_id;
  37
  38 static unsigned int __init ux500_read_asicid(phys_addr_t addr)
  39 {
  40         void __iomem *virt = ioremap(addr, 4);
  41         unsigned int asicid;
  42
  43         if (!virt)
  44                 return 0;
  45
  46         asicid = readl(virt);
  47         iounmap(virt);
  48
  49         return asicid;
  50 }
  51
  52 static void ux500_print_soc_info(unsigned int asicid)
  53 {
  54         unsigned int rev = dbx500_id.revision;
  55
  56         pr_info("DB%4x ", dbx500_id.partnumber);
  57
  58         if (rev == 0x01)
  59                 pr_cont("Early Drop");
  60         else if (rev >= 0xA0)
  61                 pr_cont("v%d.%d" , (rev >> 4) - 0xA + 1, rev & 0xf);
  62         else
  63                 pr_cont("Unknown");
  64
  65         pr_cont(" [%#010x]\n", asicid);
  66 }
  67
  68 static unsigned int partnumber(unsigned int asicid)
  69 {
  70         return (asicid >> 8) & 0xffff;
  71 }
  72
  73 /*
  74  * SOC          MIDR            ASICID ADDRESS          ASICID VALUE
  75  * DB8500ed     0x410fc090      0x9001FFF4              0x00850001
  76  * DB8500v1     0x411fc091      0x9001FFF4              0x008500A0
  77  * DB8500v1.1   0x411fc091      0x9001FFF4              0x008500A1
  78  * DB8500v2     0x412fc091      0x9001DBF4              0x008500B0
  79  * DB8520v2.2   0x412fc091      0x9001DBF4              0x008500B2
  80  * DB5500v1     0x412fc091      0x9001FFF4              0x005500A0
  81  * DB9540       0x413fc090      0xFFFFDBF4              0x009540xx
  82  */
  83
  84 static void __init ux500_setup_id(void)
  85 {
  86         unsigned int cpuid = read_cpuid_id();
  87         unsigned int asicid = 0;
  88         phys_addr_t addr = 0;
  89
  90         switch (cpuid) {
  91         case 0x410fc090: /* DB8500ed */
  92         case 0x411fc091: /* DB8500v1 */
  93                 addr = 0x9001FFF4;
  94                 break;
  95
  96         case 0x412fc091: /* DB8520 / DB8500v2 / DB5500v1 */
  97                 asicid = ux500_read_asicid(0x9001DBF4);
  98                 if (partnumber(asicid) == 0x8500 ||
  99                     partnumber(asicid) == 0x8520)
 100                         /* DB8500v2 */
 101                         break;
 102
 103                 /* DB5500v1 */
 104                 addr = 0x9001FFF4;
 105                 break;
 106
 107         case 0x413fc090: /* DB9540 */
 108                 addr = 0xFFFFDBF4;
 109                 break;
 110         }
 111
 112         if (addr)
 113                 asicid = ux500_read_asicid(addr);
 114
 115         if (!asicid) {
 116                 pr_err("Unable to identify SoC\n");
 117                 BUG();
 118         }
 119
 120         dbx500_id.process = asicid >> 24;
 121         dbx500_id.partnumber = partnumber(asicid);
 122         dbx500_id.revision = asicid & 0xff;
 123
 124         ux500_print_soc_info(asicid);
 125 }
 126
 127 static const char * __init ux500_get_machine(void)
 128 {
 129         return kasprintf(GFP_KERNEL, "DB%4x", dbx500_id.partnumber);
 130 }
 131
 132 static const char * __init ux500_get_family(void)
 133 {
 134         return kasprintf(GFP_KERNEL, "ux500");
 135 }
 136
 137 static const char * __init ux500_get_revision(void)
 138 {
 139         unsigned int rev = dbx500_id.revision;
 140
 141         if (rev == 0x01)
 142                 return kasprintf(GFP_KERNEL, "%s", "ED");
 143         else if (rev >= 0xA0)
 144                 return kasprintf(GFP_KERNEL, "%d.%d",
 145                                  (rev >> 4) - 0xA + 1, rev & 0xf);
 146
 147         return kasprintf(GFP_KERNEL, "%s", "Unknown");
 148 }
 149
 150 static ssize_t ux500_get_process(struct device *dev,
 151                                         struct device_attribute *attr,
 152                                         char *buf)
 153 {
 154         if (dbx500_id.process == 0x00)
 155                 return sprintf(buf, "Standard\n");
 156
 157         return sprintf(buf, "%02xnm\n", dbx500_id.process);
 158 }
 159
 160 static const char *db8500_read_soc_id(void)
 161 {
 162         void __iomem *uid;
 163         const char *retstr;
 164
 165         uid = ioremap(U8500_BB_UID_BASE, 0x20);
 166         if (!uid)
 167                 return NULL;
 168         /* Throw these device-specific numbers into the entropy pool */
 169         add_device_randomness(uid, 0x14);
 170         retstr = kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",
 171                          readl((u32 *)uid+0),
 172                          readl((u32 *)uid+1), readl((u32 *)uid+2),
 173                          readl((u32 *)uid+3), readl((u32 *)uid+4));
 174         iounmap(uid);
 175         return retstr;
 176 }
 177
 178 static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr)
 179 {
 180         soc_dev_attr->soc_id   = db8500_read_soc_id();
 181         soc_dev_attr->machine  = ux500_get_machine();
 182         soc_dev_attr->family   = ux500_get_family();
 183         soc_dev_attr->revision = ux500_get_revision();
 184 }
 185
 186 static const struct device_attribute ux500_soc_attr =
 187         __ATTR(process,  S_IRUGO, ux500_get_process,  NULL);
 188
 189 struct device * __init ux500_soc_device_init(void)
 190 {
 191         struct device *parent;
 192         struct soc_device *soc_dev;
 193         struct soc_device_attribute *soc_dev_attr;
 194
 195         ux500_setup_id();
 196
 197         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 198         if (!soc_dev_attr)
 199                 return ERR_PTR(-ENOMEM);
 200
 201         soc_info_populate(soc_dev_attr);
 202
 203         soc_dev = soc_device_register(soc_dev_attr);
 204         if (IS_ERR(soc_dev)) {
 205                 kfree(soc_dev_attr);
 206                 return NULL;
 207         }
 208
 209         parent = soc_device_to_device(soc_dev);
 210         device_create_file(parent, &ux500_soc_attr);
 211
 212         return parent;
 213 }