root/drivers/soc/samsung/exynos-chipid.c

DEFINITIONS

1. product_id_to_soc_id
2. exynos_chipid_early_init

   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 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 regmap *regmap;
  54         u32 product_id;
  55         u32 revision;
  56         int ret;
  57 
  58         regmap = syscon_regmap_lookup_by_compatible("samsung,exynos4210-chipid");
  59         if (IS_ERR(regmap))
  60                 return PTR_ERR(regmap);
  61 
  62         ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &product_id);
  63         if (ret < 0)
  64                 return ret;
  65 
  66         revision = product_id & EXYNOS_REV_MASK;
  67 
  68         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
  69         if (!soc_dev_attr)
  70                 return -ENOMEM;
  71 
  72         soc_dev_attr->family = "Samsung Exynos";
  73 
  74         root = of_find_node_by_path("/");
  75         of_property_read_string(root, "model", &soc_dev_attr->machine);
  76         of_node_put(root);
  77 
  78         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x", revision);
  79         soc_dev_attr->soc_id = product_id_to_soc_id(product_id);
  80         if (!soc_dev_attr->soc_id) {
  81                 pr_err("Unknown SoC\n");
  82                 ret = -ENODEV;
  83                 goto err;
  84         }
  85 
  86         /* please note that the actual registration will be deferred */
  87         soc_dev = soc_device_register(soc_dev_attr);
  88         if (IS_ERR(soc_dev)) {
  89                 ret = PTR_ERR(soc_dev);
  90                 goto err;
  91         }
  92 
  93         /* it is too early to use dev_info() here (soc_dev is NULL) */
  94         pr_info("soc soc0: Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
  95                 soc_dev_attr->soc_id, product_id, revision);
  96 
  97         return 0;
  98 
  99 err:
 100         kfree(soc_dev_attr->revision);
 101         kfree(soc_dev_attr);
 102         return ret;
 103 }
 104 
 105 early_initcall(exynos_chipid_early_init);