linux/drivers/soc/samsung/exynos-chipid.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (c) 2019 Samsung Electronics Co., Ltd.
   4 *            http://www.samsung.com/
   5 * Copyright (c) 2020 Krzysztof Kozlowski <krzk@kernel.org>
   6 *
   7 * Exynos - CHIP ID support
   8 * Author: Pankaj Dubey <pankaj.dubey@samsung.com>
   9 * Author: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
  10 * Author: Krzysztof Kozlowski <krzk@kernel.org>
  11 *
  12 * Samsung Exynos SoC Adaptive Supply Voltage and Chip ID support
  13 */
  14
  15#include <linux/device.h>
  16#include <linux/errno.h>
  17#include <linux/mfd/syscon.h>
  18#include <linux/of.h>
  19#include <linux/platform_device.h>
  20#include <linux/regmap.h>
  21#include <linux/slab.h>
  22#include <linux/soc/samsung/exynos-chipid.h>
  23#include <linux/sys_soc.h>
  24
  25#include "exynos-asv.h"
  26
  27static const struct exynos_soc_id {
  28        const char *name;
  29        unsigned int id;
  30} soc_ids[] = {
  31        /* List ordered by SoC name */
  32        { "EXYNOS3250", 0xE3472000 },
  33        { "EXYNOS4210", 0x43200000 },   /* EVT0 revision */
  34        { "EXYNOS4210", 0x43210000 },
  35        { "EXYNOS4212", 0x43220000 },
  36        { "EXYNOS4412", 0xE4412000 },
  37        { "EXYNOS5250", 0x43520000 },
  38        { "EXYNOS5260", 0xE5260000 },
  39        { "EXYNOS5410", 0xE5410000 },
  40        { "EXYNOS5420", 0xE5420000 },
  41        { "EXYNOS5433", 0xE5433000 },
  42        { "EXYNOS5440", 0xE5440000 },
  43        { "EXYNOS5800", 0xE5422000 },
  44        { "EXYNOS7420", 0xE7420000 },
  45};
  46
  47static const char *product_id_to_soc_id(unsigned int product_id)
  48{
  49        int i;
  50
  51        for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
  52                if ((product_id & EXYNOS_MASK) == soc_ids[i].id)
  53                        return soc_ids[i].name;
  54        return NULL;
  55}
  56
  57static int exynos_chipid_probe(struct platform_device *pdev)
  58{
  59        struct soc_device_attribute *soc_dev_attr;
  60        struct soc_device *soc_dev;
  61        struct device_node *root;
  62        struct regmap *regmap;
  63        u32 product_id;
  64        u32 revision;
  65        int ret;
  66
  67        regmap = device_node_to_regmap(pdev->dev.of_node);
  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 = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),
  78                                    GFP_KERNEL);
  79        if (!soc_dev_attr)
  80                return -ENOMEM;
  81
  82        soc_dev_attr->family = "Samsung Exynos";
  83
  84        root = of_find_node_by_path("/");
  85        of_property_read_string(root, "model", &soc_dev_attr->machine);
  86        of_node_put(root);
  87
  88        soc_dev_attr->revision = devm_kasprintf(&pdev->dev, GFP_KERNEL,
  89                                                "%x", revision);
  90        soc_dev_attr->soc_id = product_id_to_soc_id(product_id);
  91        if (!soc_dev_attr->soc_id) {
  92                pr_err("Unknown SoC\n");
  93                return -ENODEV;
  94        }
  95
  96        /* please note that the actual registration will be deferred */
  97        soc_dev = soc_device_register(soc_dev_attr);
  98        if (IS_ERR(soc_dev))
  99                return PTR_ERR(soc_dev);
 100
 101        ret = exynos_asv_init(&pdev->dev, regmap);
 102        if (ret)
 103                goto err;
 104
 105        platform_set_drvdata(pdev, soc_dev);
 106
 107        dev_info(soc_device_to_device(soc_dev),
 108                 "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
 109                 soc_dev_attr->soc_id, product_id, revision);
 110
 111        return 0;
 112
 113err:
 114        soc_device_unregister(soc_dev);
 115
 116        return ret;
 117}
 118
 119static int exynos_chipid_remove(struct platform_device *pdev)
 120{
 121        struct soc_device *soc_dev = platform_get_drvdata(pdev);
 122
 123        soc_device_unregister(soc_dev);
 124
 125        return 0;
 126}
 127
 128static const struct of_device_id exynos_chipid_of_device_ids[] = {
 129        { .compatible = "samsung,exynos4210-chipid" },
 130        {}
 131};
 132
 133static struct platform_driver exynos_chipid_driver = {
 134        .driver = {
 135                .name = "exynos-chipid",
 136                .of_match_table = exynos_chipid_of_device_ids,
 137        },
 138        .probe  = exynos_chipid_probe,
 139        .remove = exynos_chipid_remove,
 140};
 141builtin_platform_driver(exynos_chipid_driver);
 142