Commit 7eb7819a authored by Qing Zhang's avatar Qing Zhang Committed by Thomas Bogendoerfer
Browse files

MIPS: Loongson64: Add Loongson-2K1000 reset platform driver 



Add power management register operations to support reboot and poweroff.

Signed-off-by: default avatarQing Zhang <zhangqing@loongson.cn>
Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
parent fc5bb239

drivers/platform/mips/Kconfig

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@@ -30,4 +30,10 @@ config RS780E_ACPI 
	help

	  Loongson RS780E PCH ACPI Controller driver.



config LS2K_RESET

	bool "Loongson-2K1000 Reset Controller"

	depends on MACH_LOONGSON64 || COMPILE_TEST

	help

	  Loongson-2K1000 Reset Controller driver.



endif # MIPS_PLATFORM_DEVICES

drivers/platform/mips/Makefile

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# SPDX-License-Identifier: GPL-2.0-only

obj-$(CONFIG_CPU_HWMON) += cpu_hwmon.o

obj-$(CONFIG_RS780E_ACPI) += rs780e-acpi.o

obj-$(CONFIG_LS2K_RESET) += ls2k-reset.o

drivers/platform/mips/ls2k-reset.c

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// SPDX-License-Identifier: GPL-2.0

/*

 *  Copyright (C) 2021, Qing Zhang <zhangqing@loongson.cn>

 *  Loongson-2K1000 reset support

 */



#include <linux/of_address.h>

#include <linux/pm.h>

#include <asm/reboot.h>



#define	PM1_STS		0x0c /* Power Management 1 Status Register */

#define	PM1_CNT		0x14 /* Power Management 1 Control Register */

#define	RST_CNT		0x30 /* Reset Control Register */



static void __iomem *base;



static void ls2k_restart(char *command)

{

	writel(0x1, base + RST_CNT);

}



static void ls2k_poweroff(void)

{

	/* Clear */

	writel((readl(base + PM1_STS) & 0xffffffff), base + PM1_STS);

	/* Sleep Enable | Soft Off*/

	writel(GENMASK(12, 10) | BIT(13), base + PM1_CNT);

}



static int ls2k_reset_init(void)

{

	struct device_node *np;



	np = of_find_compatible_node(NULL, NULL, "loongson,ls2k-pm");

	if (!np) {

		pr_info("Failed to get PM node\n");

		return -ENODEV;

	}



	base = of_iomap(np, 0);

	if (!base) {

		pr_info("Failed to map PM register base address\n");

		return -ENOMEM;

	}



	_machine_restart = ls2k_restart;

	pm_power_off = ls2k_poweroff;



	of_node_put(np);

	return 0;

}



arch_initcall(ls2k_reset_init);