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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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Add SoC identification for the RZ/V2N SoC using the System Controller (SYS) block. Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/20250415085438.83856-1-prabhakar.mahadev-lad.rj@bp.renesas.com Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
141 lines
3.7 KiB
C
141 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* RZ System controller driver
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*
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* Copyright (C) 2024 Renesas Electronics Corp.
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*/
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/sys_soc.h>
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#include "rz-sysc.h"
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#define field_get(_mask, _reg) (((_reg) & (_mask)) >> (ffs(_mask) - 1))
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/**
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* struct rz_sysc - RZ SYSC private data structure
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* @base: SYSC base address
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* @dev: SYSC device pointer
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*/
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struct rz_sysc {
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void __iomem *base;
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struct device *dev;
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};
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static int rz_sysc_soc_init(struct rz_sysc *sysc, const struct of_device_id *match)
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{
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const struct rz_sysc_init_data *sysc_data = match->data;
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const struct rz_sysc_soc_id_init_data *soc_data = sysc_data->soc_id_init_data;
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struct soc_device_attribute *soc_dev_attr;
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const char *soc_id_start, *soc_id_end;
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u32 val, revision, specific_id;
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struct soc_device *soc_dev;
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char soc_id[32] = {0};
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size_t size;
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soc_id_start = strchr(match->compatible, ',') + 1;
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soc_id_end = strchr(match->compatible, '-');
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size = soc_id_end - soc_id_start + 1;
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if (size > 32)
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size = sizeof(soc_id);
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strscpy(soc_id, soc_id_start, size);
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soc_dev_attr = devm_kzalloc(sysc->dev, 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 = devm_kstrdup(sysc->dev, soc_data->family, GFP_KERNEL);
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if (!soc_dev_attr->family)
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return -ENOMEM;
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soc_dev_attr->soc_id = devm_kstrdup(sysc->dev, soc_id, GFP_KERNEL);
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if (!soc_dev_attr->soc_id)
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return -ENOMEM;
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val = readl(sysc->base + soc_data->devid_offset);
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revision = field_get(soc_data->revision_mask, val);
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specific_id = field_get(soc_data->specific_id_mask, val);
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soc_dev_attr->revision = devm_kasprintf(sysc->dev, GFP_KERNEL, "%u", revision);
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if (!soc_dev_attr->revision)
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return -ENOMEM;
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if (soc_data->id && specific_id != soc_data->id) {
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dev_warn(sysc->dev, "SoC mismatch (product = 0x%x)\n", specific_id);
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return -ENODEV;
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}
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/* Try to call SoC-specific device identification */
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if (soc_data->print_id) {
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soc_data->print_id(sysc->dev, sysc->base, soc_dev_attr);
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} else {
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dev_info(sysc->dev, "Detected Renesas %s %s Rev %s\n",
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soc_dev_attr->family, soc_dev_attr->soc_id, soc_dev_attr->revision);
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}
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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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return PTR_ERR(soc_dev);
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return 0;
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}
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static const struct of_device_id rz_sysc_match[] = {
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#ifdef CONFIG_SYSC_R9A08G045
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{ .compatible = "renesas,r9a08g045-sysc", .data = &rzg3s_sysc_init_data },
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#endif
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#ifdef CONFIG_SYS_R9A09G047
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{ .compatible = "renesas,r9a09g047-sys", .data = &rzg3e_sys_init_data },
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#endif
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#ifdef CONFIG_SYS_R9A09G056
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{ .compatible = "renesas,r9a09g056-sys", .data = &rzv2n_sys_init_data },
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#endif
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#ifdef CONFIG_SYS_R9A09G057
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{ .compatible = "renesas,r9a09g057-sys", .data = &rzv2h_sys_init_data },
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#endif
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{ }
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};
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MODULE_DEVICE_TABLE(of, rz_sysc_match);
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static int rz_sysc_probe(struct platform_device *pdev)
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{
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const struct of_device_id *match;
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struct device *dev = &pdev->dev;
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struct rz_sysc *sysc;
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match = of_match_node(rz_sysc_match, dev->of_node);
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if (!match)
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return -ENODEV;
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sysc = devm_kzalloc(dev, sizeof(*sysc), GFP_KERNEL);
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if (!sysc)
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return -ENOMEM;
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sysc->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(sysc->base))
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return PTR_ERR(sysc->base);
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sysc->dev = dev;
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return rz_sysc_soc_init(sysc, match);
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}
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static struct platform_driver rz_sysc_driver = {
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.driver = {
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.name = "renesas-rz-sysc",
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.suppress_bind_attrs = true,
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.of_match_table = rz_sysc_match
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},
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.probe = rz_sysc_probe
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};
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static int __init rz_sysc_init(void)
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{
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return platform_driver_register(&rz_sysc_driver);
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}
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subsys_initcall(rz_sysc_init);
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MODULE_DESCRIPTION("Renesas RZ System Controller Driver");
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MODULE_AUTHOR("Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>");
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MODULE_LICENSE("GPL");
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