Commit cb9a39aa authored by Wolfram Sang's avatar Wolfram Sang Committed by Geert Uytterhoeven
Browse files

soc: renesas: rcar-rst: Allow WDT reset on R-Car V3U 



V3U firmware misses to enable WDT resets. Because there won't be any
updates to the firmware anymore, enable that in Linux.

Signed-off-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230419201511.31648-1-wsa+renesas@sang-engineering.com


Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
parent ac9a7868

drivers/soc/renesas/rcar-rst.c

+14 −1
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 


#define WDTRSTCR_RESET		0xA55A0002

#define WDTRSTCR		0x0054

#define GEN4_WDTRSTCR		0x0010



#define CR7BAR			0x0070

#define CR7BAREN		BIT(4)
@@ -27,6 +28,12 @@ static int rcar_rst_enable_wdt_reset(void __iomem *base) 
	return 0;

}



static int rcar_rst_v3u_enable_wdt_reset(void __iomem *base)

{

	iowrite32(WDTRSTCR_RESET, base + GEN4_WDTRSTCR);

	return 0;

}



/*

 * Most of the R-Car Gen3 SoCs have an ARM Realtime Core.

 * Firmware boot address has to be set in CR7BAR before
@@ -66,6 +73,12 @@ static const struct rst_config rcar_rst_gen3 __initconst = { 
	.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 */

};
@@ -101,7 +114,7 @@ static const struct of_device_id rcar_rst_matches[] __initconst = { 
	{ .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_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 },

	{ /* sentinel */ }