diff options
Diffstat (limited to 'drivers/soc/samsung/exynos-chipid.c')
| -rw-r--r-- | drivers/soc/samsung/exynos-chipid.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/drivers/soc/samsung/exynos-chipid.c b/drivers/soc/samsung/exynos-chipid.c new file mode 100644 index 0000000000..7ba45c4aff --- /dev/null +++ b/drivers/soc/samsung/exynos-chipid.c @@ -0,0 +1,209 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2019 Samsung Electronics Co., Ltd. + * http://www.samsung.com/ + * Copyright (c) 2020 Krzysztof Kozlowski <krzk@kernel.org> + * + * Exynos - CHIP ID support + * Author: Pankaj Dubey <pankaj.dubey@samsung.com> + * Author: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> + * Author: Krzysztof Kozlowski <krzk@kernel.org> + * + * Samsung Exynos SoC Adaptive Supply Voltage and Chip ID support + */ + +#include <linux/device.h> +#include <linux/errno.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/slab.h> +#include <linux/soc/samsung/exynos-chipid.h> +#include <linux/sys_soc.h> + +#include "exynos-asv.h" + +struct exynos_chipid_variant { + unsigned int rev_reg; /* revision register offset */ + unsigned int main_rev_shift; /* main revision offset in rev_reg */ + unsigned int sub_rev_shift; /* sub revision offset in rev_reg */ +}; + +struct exynos_chipid_info { + u32 product_id; + u32 revision; +}; + +static const struct exynos_soc_id { + const char *name; + unsigned int id; +} soc_ids[] = { + /* List ordered by SoC name */ + /* Compatible with: samsung,exynos4210-chipid */ + { "EXYNOS3250", 0xE3472000 }, + { "EXYNOS4210", 0x43200000 }, /* EVT0 revision */ + { "EXYNOS4210", 0x43210000 }, + { "EXYNOS4212", 0x43220000 }, + { "EXYNOS4412", 0xE4412000 }, + { "EXYNOS5250", 0x43520000 }, + { "EXYNOS5260", 0xE5260000 }, + { "EXYNOS5410", 0xE5410000 }, + { "EXYNOS5420", 0xE5420000 }, + { "EXYNOS5433", 0xE5433000 }, + { "EXYNOS5440", 0xE5440000 }, + { "EXYNOS5800", 0xE5422000 }, + { "EXYNOS7420", 0xE7420000 }, + /* Compatible with: samsung,exynos850-chipid */ + { "EXYNOS7885", 0xE7885000 }, + { "EXYNOS850", 0xE3830000 }, + { "EXYNOSAUTOV9", 0xAAA80000 }, +}; + +static const char *product_id_to_soc_id(unsigned int product_id) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(soc_ids); i++) + if (product_id == soc_ids[i].id) + return soc_ids[i].name; + return NULL; +} + +static int exynos_chipid_get_chipid_info(struct regmap *regmap, + const struct exynos_chipid_variant *data, + struct exynos_chipid_info *soc_info) +{ + int ret; + unsigned int val, main_rev, sub_rev; + + ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val); + if (ret < 0) + return ret; + soc_info->product_id = val & EXYNOS_MASK; + + if (data->rev_reg != EXYNOS_CHIPID_REG_PRO_ID) { + ret = regmap_read(regmap, data->rev_reg, &val); + if (ret < 0) + return ret; + } + main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK; + sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK; + soc_info->revision = (main_rev << EXYNOS_REV_PART_SHIFT) | sub_rev; + + return 0; +} + +static int exynos_chipid_probe(struct platform_device *pdev) +{ + const struct exynos_chipid_variant *drv_data; + struct exynos_chipid_info soc_info; + struct soc_device_attribute *soc_dev_attr; + struct soc_device *soc_dev; + struct device_node *root; + struct regmap *regmap; + int ret; + + drv_data = of_device_get_match_data(&pdev->dev); + if (!drv_data) + return -EINVAL; + + regmap = device_node_to_regmap(pdev->dev.of_node); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info); + if (ret < 0) + return ret; + + soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr), + GFP_KERNEL); + if (!soc_dev_attr) + return -ENOMEM; + + soc_dev_attr->family = "Samsung Exynos"; + + root = of_find_node_by_path("/"); + of_property_read_string(root, "model", &soc_dev_attr->machine); + of_node_put(root); + + soc_dev_attr->revision = devm_kasprintf(&pdev->dev, GFP_KERNEL, + "%x", soc_info.revision); + soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.product_id); + if (!soc_dev_attr->soc_id) { + pr_err("Unknown SoC\n"); + return -ENODEV; + } + + /* please note that the actual registration will be deferred */ + soc_dev = soc_device_register(soc_dev_attr); + if (IS_ERR(soc_dev)) + return PTR_ERR(soc_dev); + + ret = exynos_asv_init(&pdev->dev, regmap); + if (ret) + goto err; + + platform_set_drvdata(pdev, soc_dev); + + dev_info(&pdev->dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n", + soc_dev_attr->soc_id, soc_info.product_id, soc_info.revision); + + return 0; + +err: + soc_device_unregister(soc_dev); + + return ret; +} + +static int exynos_chipid_remove(struct platform_device *pdev) +{ + struct soc_device *soc_dev = platform_get_drvdata(pdev); + + soc_device_unregister(soc_dev); + + return 0; +} + +static const struct exynos_chipid_variant exynos4210_chipid_drv_data = { + .rev_reg = 0x0, + .main_rev_shift = 4, + .sub_rev_shift = 0, +}; + +static const struct exynos_chipid_variant exynos850_chipid_drv_data = { + .rev_reg = 0x10, + .main_rev_shift = 20, + .sub_rev_shift = 16, +}; + +static const struct of_device_id exynos_chipid_of_device_ids[] = { + { + .compatible = "samsung,exynos4210-chipid", + .data = &exynos4210_chipid_drv_data, + }, { + .compatible = "samsung,exynos850-chipid", + .data = &exynos850_chipid_drv_data, + }, + { } +}; +MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids); + +static struct platform_driver exynos_chipid_driver = { + .driver = { + .name = "exynos-chipid", + .of_match_table = exynos_chipid_of_device_ids, + }, + .probe = exynos_chipid_probe, + .remove = exynos_chipid_remove, +}; +module_platform_driver(exynos_chipid_driver); + +MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver"); +MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>"); +MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>"); +MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>"); +MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>"); +MODULE_LICENSE("GPL"); |