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         { "EXYNOS3250", 0xE3472000 },
  24         { "EXYNOS4210", 0x43200000 },   /* EVT0 revision */
  25         { "EXYNOS4210", 0x43210000 },
  26         { "EXYNOS4212", 0x43220000 },
  27         { "EXYNOS4412", 0xE4412000 },
  28         { "EXYNOS5250", 0x43520000 },
  29         { "EXYNOS5260", 0xE5260000 },
  30         { "EXYNOS5410", 0xE5410000 },
  31         { "EXYNOS5420", 0xE5420000 },
  32         { "EXYNOS5440", 0xE5440000 },
  33         { "EXYNOS5800", 0xE5422000 },
  34         { "EXYNOS7420", 0xE7420000 },
  35         { "EXYNOS5433", 0xE5433000 },
  36 };
  37
  38 static const char * __init product_id_to_soc_id(unsigned int product_id)
  39 {
  40         int i;
  41
  42         for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
  43                 if ((product_id & EXYNOS_MASK) == soc_ids[i].id)
  44                         return soc_ids[i].name;
  45         return NULL;
  46 }
  47
  48 static int __init exynos_chipid_early_init(void)
  49 {
  50         struct soc_device_attribute *soc_dev_attr;
  51         struct soc_device *soc_dev;
  52         struct device_node *root;
  53         struct device_node *syscon;
  54         struct regmap *regmap;
  55         u32 product_id;
  56         u32 revision;
  57         int ret;
  58
  59         syscon = of_find_compatible_node(NULL, NULL,
  60                                          "samsung,exynos4210-chipid");
  61         if (!syscon)
  62                 return ENODEV;
  63
  64         regmap = device_node_to_regmap(syscon);
  65         of_node_put(syscon);
  66
  67         if (IS_ERR(regmap))
  68                 return PTR_ERR(regmap);
  69
  70         ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &product_id);
  71         if (ret < 0)
  72                 return ret;
  73
  74         revision = product_id & EXYNOS_REV_MASK;
  75
  76         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
  77         if (!soc_dev_attr)
  78                 return -ENOMEM;
  79
  80         soc_dev_attr->family = "Samsung Exynos";
  81
  82         root = of_find_node_by_path("/");
  83         of_property_read_string(root, "model", &soc_dev_attr->machine);
  84         of_node_put(root);
  85
  86         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x", revision);
  87         soc_dev_attr->soc_id = product_id_to_soc_id(product_id);
  88         if (!soc_dev_attr->soc_id) {
  89                 pr_err("Unknown SoC\n");
  90                 ret = -ENODEV;
  91                 goto err;
  92         }
  93
  94         /* please note that the actual registration will be deferred */
  95         soc_dev = soc_device_register(soc_dev_attr);
  96         if (IS_ERR(soc_dev)) {
  97                 ret = PTR_ERR(soc_dev);
  98                 goto err;
  99         }
 100
 101         /* it is too early to use dev_info() here (soc_dev is NULL) */
 102         pr_info("soc soc0: Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
 103                 soc_dev_attr->soc_id, product_id, revision);
 104
 105         return 0;
 106
 107 err:
 108         kfree(soc_dev_attr->revision);
 109         kfree(soc_dev_attr);
 110         return ret;
 111 }
 112
 113 early_initcall(exynos_chipid_early_init);