#include <linux/array_size.h>
#include <linux/device.h>
#include <linux/device/devres.h>
#include <linux/err.h>
#include <linux/ioport.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 main_rev_reg;
unsigned int sub_rev_reg;
unsigned int main_rev_shift;
unsigned int sub_rev_shift;
bool efuse;
};
struct exynos_chipid_info {
u32 product_id;
u32 revision;
};
static const struct exynos_soc_id {
const char *name;
unsigned int id;
} soc_ids[] = {
{ "EXYNOS3250", 0xE3472000 },
{ "EXYNOS4210", 0x43200000 },
{ "EXYNOS4210", 0x43210000 },
{ "EXYNOS4212", 0x43220000 },
{ "EXYNOS4412", 0xE4412000 },
{ "EXYNOS5250", 0x43520000 },
{ "EXYNOS5260", 0xE5260000 },
{ "EXYNOS5410", 0xE5410000 },
{ "EXYNOS5420", 0xE5420000 },
{ "EXYNOS5433", 0xE5433000 },
{ "EXYNOS5440", 0xE5440000 },
{ "EXYNOS5800", 0xE5422000 },
{ "EXYNOS7420", 0xE7420000 },
{ "EXYNOS7870", 0xE7870000 },
{ "EXYNOS8890", 0xE8890000 },
{ "EXYNOS2200", 0xE9925000 },
{ "EXYNOS7885", 0xE7885000 },
{ "EXYNOS850", 0xE3830000 },
{ "EXYNOS8895", 0xE8895000 },
{ "EXYNOS9610", 0xE9610000 },
{ "EXYNOS9810", 0xE9810000 },
{ "EXYNOS990", 0xE9830000 },
{ "EXYNOSAUTOV9", 0xAAA80000 },
{ "EXYNOSAUTOV920", 0x0A920000 },
{ "GS101", 0x9845000 },
};
static const char *exynos_product_id_to_name(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 device *dev,
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 dev_err_probe(dev, ret, "failed to read Product ID\n");
soc_info->product_id = val & EXYNOS_MASK;
if (data->sub_rev_reg == EXYNOS_CHIPID_REG_PRO_ID) {
main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;
sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK;
} else {
unsigned int val2;
ret = regmap_read(regmap, data->sub_rev_reg, &val2);
if (ret < 0)
return dev_err_probe(dev, ret,
"failed to read revision\n");
if (data->main_rev_reg == EXYNOS_CHIPID_REG_PRO_ID)
main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;
else
main_rev = (val2 >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;
sub_rev = (val2 >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK;
}
soc_info->revision = (main_rev << EXYNOS_REV_PART_SHIFT) | sub_rev;
return 0;
}
static struct regmap *exynos_chipid_get_efuse_regmap(struct platform_device *pdev)
{
struct resource *res;
void __iomem *base;
base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(base))
return ERR_CAST(base);
const struct regmap_config reg_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.use_relaxed_mmio = true,
.max_register = (resource_size(res) - reg_config.reg_stride),
};
return devm_regmap_init_mmio_clk(&pdev->dev, "pclk", base, ®_config);
}
static void exynos_chipid_unregister_soc(void *data)
{
soc_device_unregister(data);
}
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 device *dev = &pdev->dev;
struct soc_device *soc_dev;
struct device_node *root;
struct regmap *regmap;
int ret;
drv_data = of_device_get_match_data(dev);
if (!drv_data)
return dev_err_probe(dev, -EINVAL,
"failed to get match data\n");
if (drv_data->efuse)
regmap = exynos_chipid_get_efuse_regmap(pdev);
else
regmap = device_node_to_regmap(dev->of_node);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap),
"failed to get regmap\n");
ret = exynos_chipid_get_chipid_info(dev, regmap, drv_data, &soc_info);
if (ret < 0)
return ret;
soc_dev_attr = devm_kzalloc(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(dev, GFP_KERNEL, "%x",
soc_info.revision);
if (!soc_dev_attr->revision)
return -ENOMEM;
soc_dev_attr->soc_id = exynos_product_id_to_name(soc_info.product_id);
if (!soc_dev_attr->soc_id)
return dev_err_probe(dev, -ENODEV, "Unknown SoC\n");
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev))
return dev_err_probe(dev, PTR_ERR(soc_dev),
"failed to register to the soc interface\n");
ret = devm_add_action_or_reset(dev, exynos_chipid_unregister_soc,
soc_dev);
if (ret)
return dev_err_probe(dev, ret, "failed to add devm action\n");
ret = exynos_asv_init(dev, regmap);
if (ret)
return ret;
dev_dbg(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;
}
static const struct exynos_chipid_variant exynos4210_chipid_drv_data = {
.main_rev_shift = 4,
.sub_rev_shift = 0,
};
static const struct exynos_chipid_variant exynos850_chipid_drv_data = {
.main_rev_reg = 0x10,
.sub_rev_reg = 0x10,
.main_rev_shift = 20,
.sub_rev_shift = 16,
};
static const struct exynos_chipid_variant gs101_chipid_drv_data = {
.sub_rev_reg = 0x10,
.sub_rev_shift = 16,
.efuse = true,
};
static const struct of_device_id exynos_chipid_of_device_ids[] = {
{
.compatible = "google,gs101-otp",
.data = &gs101_chipid_drv_data,
}, {
.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,
};
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");
