mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 10:32:35 +00:00
547276c679
Signed-off-by: Biju Das <biju.das@bp.renesas.com> Reviewed-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* R-Car Gen1 RESET/WDT, R-Car Gen2, Gen3, and RZ/G RST Driver
|
|
*
|
|
* Copyright (C) 2016 Glider bvba
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/soc/renesas/rcar-rst.h>
|
|
|
|
#define WDTRSTCR_RESET 0xA55A0002
|
|
#define WDTRSTCR 0x0054
|
|
|
|
static int rcar_rst_enable_wdt_reset(void __iomem *base)
|
|
{
|
|
iowrite32(WDTRSTCR_RESET, base + WDTRSTCR);
|
|
return 0;
|
|
}
|
|
|
|
struct rst_config {
|
|
unsigned int modemr; /* Mode Monitoring Register Offset */
|
|
int (*configure)(void *base); /* Platform specific configuration */
|
|
};
|
|
|
|
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,
|
|
};
|
|
|
|
static const struct of_device_id rcar_rst_matches[] __initconst = {
|
|
/* RZ/G1 is handled like R-Car 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,r8a774c0-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,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 },
|
|
{ /* sentinel */ }
|
|
};
|
|
|
|
static void __iomem *rcar_rst_base __initdata;
|
|
static u32 saved_mode __initdata;
|
|
|
|
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;
|
|
saved_mode = ioread32(base + cfg->modemr);
|
|
if (cfg->configure) {
|
|
error = cfg->configure(base);
|
|
if (error) {
|
|
pr_warn("%pOF: Cannot run SoC specific configuration\n",
|
|
np);
|
|
goto out_put;
|
|
}
|
|
}
|
|
|
|
pr_debug("%pOF: MODE = 0x%08x\n", np, saved_mode);
|
|
|
|
out_put:
|
|
of_node_put(np);
|
|
return error;
|
|
}
|
|
|
|
int __init rcar_rst_read_mode_pins(u32 *mode)
|
|
{
|
|
int error;
|
|
|
|
if (!rcar_rst_base) {
|
|
error = rcar_rst_init();
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
*mode = saved_mode;
|
|
return 0;
|
|
}
|