linux/drivers/soc/ux500/ux500-soc-id.c
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   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 */
  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
  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
  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: /* 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
 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
 159static const char *db8500_read_soc_id(struct device_node *backupram)
 160{
 161        void __iomem *base;
 162        void __iomem *uid;
 163        const char *retstr;
 164
 165        base = of_iomap(backupram, 0);
 166        if (!base)
 167                return NULL;
 168        uid = base + 0x1fc0;
 169
 170        /* 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));
 176        iounmap(base);
 177        return retstr;
 178}
 179
 180static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
 181                                     struct device_node *backupram)
 182{
 183        soc_dev_attr->soc_id   = db8500_read_soc_id(backupram);
 184        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
 192static int __init ux500_soc_device_init(void)
 193{
 194        struct device *parent;
 195        struct soc_device *soc_dev;
 196        struct soc_device_attribute *soc_dev_attr;
 197        struct device_node *backupram;
 198
 199        backupram = of_find_compatible_node(NULL, NULL, "ste,dbx500-backupram");
 200        if (!backupram)
 201                return 0;
 202
 203        ux500_setup_id();
 204
 205        soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 206        if (!soc_dev_attr) {
 207                of_node_put(backupram);
 208                return -ENOMEM;
 209        }
 210
 211        soc_info_populate(soc_dev_attr, backupram);
 212        of_node_put(backupram);
 213
 214        soc_dev = soc_device_register(soc_dev_attr);
 215        if (IS_ERR(soc_dev)) {
 216                kfree(soc_dev_attr);
 217                return PTR_ERR(soc_dev);
 218        }
 219
 220        parent = soc_device_to_device(soc_dev);
 221        device_create_file(parent, &ux500_soc_attr);
 222
 223        return 0;
 224}
 225subsys_initcall(ux500_soc_device_init);
 226