drivers/soc/renesas/rcar-rst.c

Source file repositories/reference/linux-study-clean/drivers/soc/renesas/rcar-rst.c

File Facts

System
Linux kernel
Corpus path
drivers/soc/renesas/rcar-rst.c
Extension
.c
Size
5589 bytes
Lines
187
Domain
Driver Families
Bucket
drivers/soc
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct rst_config {
	unsigned int modemr;		/* Mode Monitoring Register Offset */
	int (*configure)(void __iomem *base);	/* Platform specific config */
	int (*set_rproc_boot_addr)(u64 boot_addr);
};

static const struct rst_config rcar_rst_gen1 __initconst = {
	.modemr = 0x20,
};

static const struct rst_config rcar_rst_gen2 __initconst = {
	.modemr = 0x60,
	.configure = rcar_rst_enable_wdt_reset,
};

static const struct rst_config rcar_rst_gen3 __initconst = {
	.modemr = 0x60,
	.set_rproc_boot_addr = rcar_rst_set_gen3_rproc_boot_addr,
};

/* V3U firmware doesn't enable WDT reset and there won't be updates anymore */
static const struct rst_config rcar_rst_v3u __initconst = {
	.modemr = 0x00,		/* MODEMR0 and it has CPG related bits */
	.configure = rcar_rst_v3u_enable_wdt_reset,
};

static const struct rst_config rcar_rst_gen4 __initconst = {
	.modemr = 0x00,		/* MODEMR0 and it has CPG related bits */
};

static const struct of_device_id rcar_rst_matches[] __initconst = {
	/* RZ/G1 is handled like R-Car Gen2 */
	{ .compatible = "renesas,r8a7742-rst", .data = &rcar_rst_gen2 },
	{ .compatible = "renesas,r8a7743-rst", .data = &rcar_rst_gen2 },
	{ .compatible = "renesas,r8a7744-rst", .data = &rcar_rst_gen2 },
	{ .compatible = "renesas,r8a7745-rst", .data = &rcar_rst_gen2 },
	{ .compatible = "renesas,r8a77470-rst", .data = &rcar_rst_gen2 },
	/* RZ/G2 is handled like R-Car Gen3 */
	{ .compatible = "renesas,r8a774a1-rst", .data = &rcar_rst_gen3 },
	{ .compatible = "renesas,r8a774b1-rst", .data = &rcar_rst_gen3 },
	{ .compatible = "renesas,r8a774c0-rst", .data = &rcar_rst_gen3 },
	{ .compatible = "renesas,r8a774e1-rst", .data = &rcar_rst_gen3 },
	/* R-Car Gen1 */
	{ .compatible = "renesas,r8a7778-reset-wdt", .data = &rcar_rst_gen1 },
	{ .compatible = "renesas,r8a7779-reset-wdt", .data = &rcar_rst_gen1 },
	/* R-Car Gen2 */
	{ .compatible = "renesas,r8a7790-rst", .data = &rcar_rst_gen2 },
	{ .compatible = "renesas,r8a7791-rst", .data = &rcar_rst_gen2 },
	{ .compatible = "renesas,r8a7792-rst", .data = &rcar_rst_gen2 },
	{ .compatible = "renesas,r8a7793-rst", .data = &rcar_rst_gen2 },
	{ .compatible = "renesas,r8a7794-rst", .data = &rcar_rst_gen2 },
	/* R-Car Gen3 */
	{ .compatible = "renesas,r8a7795-rst", .data = &rcar_rst_gen3 },
	{ .compatible = "renesas,r8a7796-rst", .data = &rcar_rst_gen3 },
	{ .compatible = "renesas,r8a77961-rst", .data = &rcar_rst_gen3 },
	{ .compatible = "renesas,r8a77965-rst", .data = &rcar_rst_gen3 },
	{ .compatible = "renesas,r8a77970-rst", .data = &rcar_rst_gen3 },
	{ .compatible = "renesas,r8a77980-rst", .data = &rcar_rst_gen3 },
	{ .compatible = "renesas,r8a77990-rst", .data = &rcar_rst_gen3 },
	{ .compatible = "renesas,r8a77995-rst", .data = &rcar_rst_gen3 },
	/* R-Car Gen4 */
	{ .compatible = "renesas,r8a779a0-rst", .data = &rcar_rst_v3u },
	{ .compatible = "renesas,r8a779f0-rst", .data = &rcar_rst_gen4 },
	{ .compatible = "renesas,r8a779g0-rst", .data = &rcar_rst_gen4 },
	{ .compatible = "renesas,r8a779h0-rst", .data = &rcar_rst_gen4 },
	{ /* sentinel */ }
};

static int __init rcar_rst_init(void)
{
	const struct of_device_id *match;
	const struct rst_config *cfg;
	struct device_node *np;
	void __iomem *base;
	int error = 0;

	np = of_find_matching_node_and_match(NULL, rcar_rst_matches, &match);
	if (!np)
		return -ENODEV;

	base = of_iomap(np, 0);
	if (!base) {
		pr_warn("%pOF: Cannot map regs\n", np);
		error = -ENOMEM;
		goto out_put;
	}

	rcar_rst_base = base;
	cfg = match->data;
	rcar_rst_set_rproc_boot_addr_func = cfg->set_rproc_boot_addr;

Annotation

Implementation Notes