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

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Add power management register operations to support reboot and poweroff.

Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Qing Zhang 2021-11-26 09:52:14 +08:00 committed by Thomas Bogendoerfer
parent fc5bb239d5
commit 7eb7819a2e
3 changed files with 60 additions and 0 deletions
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6
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

1
drivers/platform/mips/Makefile
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@ -1,3 +1,4 @@
# 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

53
drivers/platform/mips/ls2k-reset.c Normal file
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@ -0,0 +1,53 @@
// 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);