drivers/soc/samsung/exynos-chipid.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2019 Samsung Electronics Co., Ltd.
   4  *            http://www.samsung.com/
   5  *
   6  * Exynos - CHIP ID support
   7  * Author: Pankaj Dubey <pankaj.dubey@samsung.com>
   8  * Author: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
   9  */
  10
  11 #include <linux/io.h>
  12 #include <linux/mfd/syscon.h>
  13 #include <linux/of.h>
  14 #include <linux/regmap.h>
  15 #include <linux/slab.h>
  16 #include <linux/soc/samsung/exynos-chipid.h>
  17 #include <linux/sys_soc.h>
  18
  19 static const struct exynos_soc_id {
  20         const char *name;
  21         unsigned int id;
  22 } soc_ids[] = {
  23         /* List ordered by SoC name */
  24         { "EXYNOS3250", 0xE3472000 },
  25         { "EXYNOS4210", 0x43200000 },   /* EVT0 revision */
  26         { "EXYNOS4210", 0x43210000 },
  27         { "EXYNOS4212", 0x43220000 },
  28         { "EXYNOS4412", 0xE4412000 },
  29         { "EXYNOS5250", 0x43520000 },
  30         { "EXYNOS5260", 0xE5260000 },
  31         { "EXYNOS5410", 0xE5410000 },
  32         { "EXYNOS5420", 0xE5420000 },
  33         { "EXYNOS5433", 0xE5433000 },
  34         { "EXYNOS5440", 0xE5440000 },
  35         { "EXYNOS5800", 0xE5422000 },
  36         { "EXYNOS7420", 0xE7420000 },
  37 };
  38
  39 static const char * __init product_id_to_soc_id(unsigned int product_id)
  40 {
  41         int i;
  42
  43         for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
  44                 if ((product_id & EXYNOS_MASK) == soc_ids[i].id)
  45                         return soc_ids[i].name;
  46         return NULL;
  47 }
  48
  49 static int __init exynos_chipid_early_init(void)
  50 {
  51         struct soc_device_attribute *soc_dev_attr;
  52         struct soc_device *soc_dev;
  53         struct device_node *root;
  54         struct device_node *syscon;
  55         struct regmap *regmap;
  56         u32 product_id;
  57         u32 revision;
  58         int ret;
  59
  60         syscon = of_find_compatible_node(NULL, NULL,
  61                                          "samsung,exynos4210-chipid");
  62         if (!syscon)
  63                 return -ENODEV;
  64
  65         regmap = device_node_to_regmap(syscon);
  66         of_node_put(syscon);
  67
  68         if (IS_ERR(regmap))
  69                 return PTR_ERR(regmap);
  70
  71         ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &product_id);
  72         if (ret < 0)
  73                 return ret;
  74
  75         revision = product_id & EXYNOS_REV_MASK;
  76
  77         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
  78         if (!soc_dev_attr)
  79                 return -ENOMEM;
  80
  81         soc_dev_attr->family = "Samsung Exynos";
  82
  83         root = of_find_node_by_path("/");
  84         of_property_read_string(root, "model", &soc_dev_attr->machine);
  85         of_node_put(root);
  86
  87         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x", revision);
  88         soc_dev_attr->soc_id = product_id_to_soc_id(product_id);
  89         if (!soc_dev_attr->soc_id) {
  90                 pr_err("Unknown SoC\n");
  91                 ret = -ENODEV;
  92                 goto err;
  93         }
  94
  95         /* please note that the actual registration will be deferred */
  96         soc_dev = soc_device_register(soc_dev_attr);
  97         if (IS_ERR(soc_dev)) {
  98                 ret = PTR_ERR(soc_dev);
  99                 goto err;
 100         }
 101
 102         dev_info(soc_device_to_device(soc_dev),
 103                  "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
 104                  soc_dev_attr->soc_id, product_id, revision);
 105
 106         return 0;
 107
 108 err:
 109         kfree(soc_dev_attr->revision);
 110         kfree(soc_dev_attr);
 111         return ret;
 112 }
 113
 114 arch_initcall(exynos_chipid_early_init);