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// SPDX-License-Identifier: GPL-2.0
/*
* RZ System controller driver
*
* Copyright (C) 2024 Renesas Electronics Corp.
*/
#include <linux/cleanup.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include "rz-sysc.h"
#define field_get(_mask, _reg) (((_reg) & (_mask)) >> (ffs(_mask) - 1))
/**
* struct rz_sysc - RZ SYSC private data structure
* @base: SYSC base address
* @dev: SYSC device pointer
*/
struct rz_sysc {
void __iomem *base;
struct device *dev;
};
static int rz_sysc_soc_init(struct rz_sysc *sysc, const struct of_device_id *match)
{
const struct rz_sysc_init_data *sysc_data = match->data;
const struct rz_sysc_soc_id_init_data *soc_data = sysc_data->soc_id_init_data;
struct soc_device_attribute *soc_dev_attr;
const char *soc_id_start, *soc_id_end;
u32 val, revision, specific_id;
struct soc_device *soc_dev;
char soc_id[32] = {0};
size_t size;
soc_id_start = strchr(match->compatible, ',') + 1;
soc_id_end = strchr(match->compatible, '-');
size = soc_id_end - soc_id_start + 1;
if (size > 32)
size = sizeof(soc_id);
strscpy(soc_id, soc_id_start, size);
soc_dev_attr = devm_kzalloc(sysc->dev, sizeof(*soc_dev_attr), GFP_KERNEL);
if (!soc_dev_attr)
return -ENOMEM;
soc_dev_attr->family = devm_kstrdup(sysc->dev, soc_data->family, GFP_KERNEL);
if (!soc_dev_attr->family)
return -ENOMEM;
soc_dev_attr->soc_id = devm_kstrdup(sysc->dev, soc_id, GFP_KERNEL);
if (!soc_dev_attr->soc_id)
return -ENOMEM;
val = readl(sysc->base + soc_data->devid_offset);
revision = field_get(soc_data->revision_mask, val);
specific_id = field_get(soc_data->specific_id_mask, val);
soc_dev_attr->revision = devm_kasprintf(sysc->dev, GFP_KERNEL, "%u", revision);
if (!soc_dev_attr->revision)
return -ENOMEM;
if (soc_data->id && specific_id != soc_data->id) {
dev_warn(sysc->dev, "SoC mismatch (product = 0x%x)\n", specific_id);
return -ENODEV;
}
/* Try to call SoC-specific device identification */
if (soc_data->print_id) {
soc_data->print_id(sysc->dev, sysc->base, soc_dev_attr);
} else {
dev_info(sysc->dev, "Detected Renesas %s %s Rev %s\n",
soc_dev_attr->family, soc_dev_attr->soc_id, soc_dev_attr->revision);
}
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev))
return PTR_ERR(soc_dev);
return 0;
}
static const struct of_device_id rz_sysc_match[] = {
#ifdef CONFIG_SYSC_R9A08G045
{ .compatible = "renesas,r9a08g045-sysc", .data = &rzg3s_sysc_init_data },
#endif
#ifdef CONFIG_SYS_R9A09G047
{ .compatible = "renesas,r9a09g047-sys", .data = &rzg3e_sys_init_data },
#endif
#ifdef CONFIG_SYS_R9A09G056
{ .compatible = "renesas,r9a09g056-sys", .data = &rzv2n_sys_init_data },
#endif
#ifdef CONFIG_SYS_R9A09G057
{ .compatible = "renesas,r9a09g057-sys", .data = &rzv2h_sys_init_data },
#endif
{ }
};
MODULE_DEVICE_TABLE(of, rz_sysc_match);
static int rz_sysc_probe(struct platform_device *pdev)
{
const struct rz_sysc_init_data *data;
const struct of_device_id *match;
struct device *dev = &pdev->dev;
struct regmap *regmap;
struct rz_sysc *sysc;
int ret;
struct regmap_config *regmap_cfg __free(kfree) = kzalloc(sizeof(*regmap_cfg), GFP_KERNEL);
if (!regmap_cfg)
return -ENOMEM;
match = of_match_node(rz_sysc_match, dev->of_node);
if (!match)
return -ENODEV;
data = match->data;
sysc = devm_kzalloc(dev, sizeof(*sysc), GFP_KERNEL);
if (!sysc)
return -ENOMEM;
sysc->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(sysc->base))
return PTR_ERR(sysc->base);
sysc->dev = dev;
ret = rz_sysc_soc_init(sysc, match);
if (ret)
return ret;
regmap_cfg->name = "rz_sysc_regs";
regmap_cfg->reg_bits = 32;
regmap_cfg->reg_stride = 4;
regmap_cfg->val_bits = 32;
regmap_cfg->fast_io = true;
regmap_cfg->max_register = data->max_register;
regmap = devm_regmap_init_mmio(dev, sysc->base, regmap_cfg);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
return of_syscon_register_regmap(dev->of_node, regmap);
}
static struct platform_driver rz_sysc_driver = {
.driver = {
.name = "renesas-rz-sysc",
.suppress_bind_attrs = true,
.of_match_table = rz_sysc_match
},
.probe = rz_sysc_probe
};
static int __init rz_sysc_init(void)
{
return platform_driver_register(&rz_sysc_driver);
}
subsys_initcall(rz_sysc_init);
MODULE_DESCRIPTION("Renesas RZ System Controller Driver");
MODULE_AUTHOR("Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>");
MODULE_LICENSE("GPL");
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