114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2019 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* Exynos - CHIP ID support
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* Author: Pankaj Dubey <pankaj.dubey@samsung.com>
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* Author: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
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*/
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#include <linux/io.h>
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#include <linux/mfd/syscon.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/soc/samsung/exynos-chipid.h>
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#include <linux/sys_soc.h>
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static const struct exynos_soc_id {
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const char *name;
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unsigned int id;
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} soc_ids[] = {
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{ "EXYNOS3250", 0xE3472000 },
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{ "EXYNOS4210", 0x43200000 }, /* EVT0 revision */
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{ "EXYNOS4210", 0x43210000 },
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{ "EXYNOS4212", 0x43220000 },
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{ "EXYNOS4412", 0xE4412000 },
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{ "EXYNOS5250", 0x43520000 },
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{ "EXYNOS5260", 0xE5260000 },
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{ "EXYNOS5410", 0xE5410000 },
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{ "EXYNOS5420", 0xE5420000 },
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{ "EXYNOS5440", 0xE5440000 },
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{ "EXYNOS5800", 0xE5422000 },
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{ "EXYNOS7420", 0xE7420000 },
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{ "EXYNOS5433", 0xE5433000 },
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};
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static const char * __init product_id_to_soc_id(unsigned int product_id)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
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if ((product_id & EXYNOS_MASK) == soc_ids[i].id)
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return soc_ids[i].name;
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return NULL;
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}
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static int __init exynos_chipid_early_init(void)
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{
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struct soc_device_attribute *soc_dev_attr;
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struct soc_device *soc_dev;
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struct device_node *root;
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struct device_node *syscon;
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struct regmap *regmap;
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u32 product_id;
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u32 revision;
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int ret;
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syscon = of_find_compatible_node(NULL, NULL,
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"samsung,exynos4210-chipid");
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if (!syscon)
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return -ENODEV;
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regmap = device_node_to_regmap(syscon);
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of_node_put(syscon);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &product_id);
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if (ret < 0)
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return ret;
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revision = product_id & EXYNOS_REV_MASK;
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soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
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if (!soc_dev_attr)
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return -ENOMEM;
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soc_dev_attr->family = "Samsung Exynos";
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root = of_find_node_by_path("/");
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of_property_read_string(root, "model", &soc_dev_attr->machine);
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of_node_put(root);
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soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x", revision);
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soc_dev_attr->soc_id = product_id_to_soc_id(product_id);
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if (!soc_dev_attr->soc_id) {
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pr_err("Unknown SoC\n");
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ret = -ENODEV;
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goto err;
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}
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/* please note that the actual registration will be deferred */
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soc_dev = soc_device_register(soc_dev_attr);
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if (IS_ERR(soc_dev)) {
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ret = PTR_ERR(soc_dev);
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goto err;
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}
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/* it is too early to use dev_info() here (soc_dev is NULL) */
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pr_info("soc soc0: Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
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soc_dev_attr->soc_id, product_id, revision);
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return 0;
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err:
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kfree(soc_dev_attr->revision);
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kfree(soc_dev_attr);
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return ret;
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}
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early_initcall(exynos_chipid_early_init);
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