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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2019 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* EXYNOS - CHIP ID support
* Author: Pankaj Dubey <pankaj.dubey@samsung.com>
* Author: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
*/
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#define EXYNOS_SUBREV_MASK (0xF << 4)
#define EXYNOS_MAINREV_MASK (0xF << 0)
#define EXYNOS_REV_MASK (EXYNOS_SUBREV_MASK | EXYNOS_MAINREV_MASK)
#define EXYNOS_MASK 0xFFFFF000
static const struct exynos_soc_id {
const char *name;
unsigned int id;
} soc_ids[] = {
{ "EXYNOS3250", 0xE3472000 },
{ "EXYNOS4210", 0x43200000 }, /* EVT0 revision */
{ "EXYNOS4210", 0x43210000 },
{ "EXYNOS4212", 0x43220000 },
{ "EXYNOS4412", 0xE4412000 },
{ "EXYNOS5250", 0x43520000 },
{ "EXYNOS5260", 0xE5260000 },
{ "EXYNOS5410", 0xE5410000 },
{ "EXYNOS5420", 0xE5420000 },
{ "EXYNOS5440", 0xE5440000 },
{ "EXYNOS5800", 0xE5422000 },
{ "EXYNOS7420", 0xE7420000 },
{ "EXYNOS5433", 0xE5433000 },
};
static const char * __init product_id_to_soc_id(unsigned int product_id)
{
int i;
for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
if ((product_id & EXYNOS_MASK) == soc_ids[i].id)
return soc_ids[i].name;
return NULL;
}
int __init exynos_chipid_early_init(void)
{
struct soc_device_attribute *soc_dev_attr;
void __iomem *exynos_chipid_base;
struct soc_device *soc_dev;
struct device_node *root;
struct device_node *np;
u32 product_id;
u32 revision;
/* look up for chipid node */
np = of_find_compatible_node(NULL, NULL, "samsung,exynos4210-chipid");
if (!np)
return -ENODEV;
exynos_chipid_base = of_iomap(np, 0);
of_node_put(np);
if (!exynos_chipid_base) {
pr_err("Failed to map SoC chipid\n");
return -ENXIO;
}
product_id = readl_relaxed(exynos_chipid_base);
revision = product_id & EXYNOS_REV_MASK;
iounmap(exynos_chipid_base);
soc_dev_attr = kzalloc(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 = kasprintf(GFP_KERNEL, "%x", revision);
soc_dev_attr->soc_id = product_id_to_soc_id(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)) {
kfree(soc_dev_attr->revision);
kfree(soc_dev_attr);
return PTR_ERR(soc_dev);
}
/* it is too early to use dev_info() here (soc_dev is NULL) */
pr_info("soc soc0: Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
soc_dev_attr->soc_id, product_id, revision);
return 0;
}
early_initcall(exynos_chipid_early_init);
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