drivers/soc/aspeed/aspeed-socinfo.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* Copyright 2019 IBM Corp. */
   3
   4 #include <linux/io.h>
   5 #include <linux/of.h>
   6 #include <linux/of_address.h>
   7 #include <linux/of_platform.h>
   8 #include <linux/platform_device.h>
   9 #include <linux/slab.h>
  10 #include <linux/sys_soc.h>
  11
  12 static struct {
  13         const char *name;
  14         const u32 id;
  15 } const rev_table[] = {
  16         /* AST2400 */
  17         { "AST2400", 0x02000303 },
  18         { "AST1400", 0x02010103 },
  19         { "AST1250", 0x02010303 },
  20         /* AST2500 */
  21         { "AST2500", 0x04000303 },
  22         { "AST2510", 0x04000103 },
  23         { "AST2520", 0x04000203 },
  24         { "AST2530", 0x04000403 },
  25         /* AST2600 */
  26         { "AST2600", 0x05000303 },
  27         { "AST2620", 0x05010203 },
  28         { "AST2605", 0x05030103 },
  29         { "AST2625", 0x05030403 },
  30 };
  31
  32 static const char *siliconid_to_name(u32 siliconid)
  33 {
  34         unsigned int id = siliconid & 0xff00ffff;
  35         unsigned int i;
  36
  37         for (i = 0 ; i < ARRAY_SIZE(rev_table) ; ++i) {
  38                 if (rev_table[i].id == id)
  39                         return rev_table[i].name;
  40         }
  41
  42         return "Unknown";
  43 }
  44
  45 static const char *siliconid_to_rev(u32 siliconid)
  46 {
  47         unsigned int rev = (siliconid >> 16) & 0xff;
  48         unsigned int gen = (siliconid >> 24) & 0xff;
  49
  50         if (gen < 0x5) {
  51                 /* AST2500 and below */
  52                 switch (rev) {
  53                 case 0:
  54                         return "A0";
  55                 case 1:
  56                         return "A1";
  57                 case 3:
  58                         return "A2";
  59                 }
  60         } else {
  61                 /* AST2600 */
  62                 switch (rev) {
  63                 case 0:
  64                         return "A0";
  65                 case 1:
  66                         return "A1";
  67                 case 2:
  68                         return "A2";
  69                 case 3:
  70                         return "A3";
  71                 }
  72         }
  73
  74         return "??";
  75 }
  76
  77 static int __init aspeed_socinfo_init(void)
  78 {
  79         struct soc_device_attribute *attrs;
  80         struct soc_device *soc_dev;
  81         struct device_node *np;
  82         void __iomem *reg;
  83         bool has_chipid = false;
  84         u32 siliconid;
  85         u32 chipid[2];
  86         const char *machine = NULL;
  87
  88         np = of_find_compatible_node(NULL, NULL, "aspeed,silicon-id");
  89         if (!of_device_is_available(np)) {
  90                 of_node_put(np);
  91                 return -ENODEV;
  92         }
  93
  94         reg = of_iomap(np, 0);
  95         if (!reg) {
  96                 of_node_put(np);
  97                 return -ENODEV;
  98         }
  99         siliconid = readl(reg);
 100         iounmap(reg);
 101
 102         /* This is optional, the ast2400 does not have it */
 103         reg = of_iomap(np, 1);
 104         if (reg) {
 105                 has_chipid = true;
 106                 chipid[0] = readl(reg);
 107                 chipid[1] = readl(reg + 4);
 108                 iounmap(reg);
 109         }
 110         of_node_put(np);
 111
 112         attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
 113         if (!attrs)
 114                 return -ENODEV;
 115
 116         /*
 117          * Machine: Romulus BMC
 118          * Family: AST2500
 119          * Revision: A1
 120          * SoC ID: raw silicon revision id
 121          * Serial Number: 64-bit chipid
 122          */
 123
 124         np = of_find_node_by_path("/");
 125         of_property_read_string(np, "model", &machine);
 126         if (machine)
 127                 attrs->machine = kstrdup(machine, GFP_KERNEL);
 128         of_node_put(np);
 129
 130         attrs->family = siliconid_to_name(siliconid);
 131         attrs->revision = siliconid_to_rev(siliconid);
 132         attrs->soc_id = kasprintf(GFP_KERNEL, "%08x", siliconid);
 133
 134         if (has_chipid)
 135                 attrs->serial_number = kasprintf(GFP_KERNEL, "%08x%08x",
 136                                                  chipid[1], chipid[0]);
 137
 138         soc_dev = soc_device_register(attrs);
 139         if (IS_ERR(soc_dev)) {
 140                 kfree(attrs->machine);
 141                 kfree(attrs->soc_id);
 142                 kfree(attrs->serial_number);
 143                 kfree(attrs);
 144                 return PTR_ERR(soc_dev);
 145         }
 146
 147         pr_info("ASPEED %s rev %s (%s)\n",
 148                         attrs->family,
 149                         attrs->revision,
 150                         attrs->soc_id);
 151
 152         return 0;
 153 }
 154 early_initcall(aspeed_socinfo_init);