| Message ID | 20210701030137.10566-1-zhangqing@loongson.cn (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v7,1/3] MIPS: Loongson64: Add Loongson-2K1000 reset platform driver | expand |
Hello! On 01.07.2021 6:01, Qing Zhang wrote: > Add power management register operations to support reboot and poweroff. > > Signed-off-by: Qing Zhang <zhangqing@loongson.cn> [...] > diff --git a/drivers/platform/mips/ls2k-reset.c b/drivers/platform/mips/ls2k-reset.c > new file mode 100644 > index 000000000000..286d47bf6964 > --- /dev/null > +++ b/drivers/platform/mips/ls2k-reset.c > @@ -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 Management1 Status Register */ ^ space missing? > +#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, (void *)base + RST_CNT); > +} > + > +static void ls2k_poweroff(void) > +{ > + /* Clear */ > + writel((readl((void *)base + PM1_STS) & 0xffffffff), (void *)base + PM1_STS); Are the pointer casts really necessary above? > + /* Sleep Enable | Soft Off*/ > + writel(GENMASK(12, 10)|BIT(13), (void *)base + PM1_CNT); Spaces around that | are needed. [...] MBR, Sergei
diff --git a/drivers/platform/mips/Kconfig b/drivers/platform/mips/Kconfig index 8ac149173c64..d421e1482395 100644 --- a/drivers/platform/mips/Kconfig +++ b/drivers/platform/mips/Kconfig @@ -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 diff --git a/drivers/platform/mips/Makefile b/drivers/platform/mips/Makefile index 178149098777..4c71444e453a 100644 --- a/drivers/platform/mips/Makefile +++ b/drivers/platform/mips/Makefile @@ -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 diff --git a/drivers/platform/mips/ls2k-reset.c b/drivers/platform/mips/ls2k-reset.c new file mode 100644 index 000000000000..286d47bf6964 --- /dev/null +++ b/drivers/platform/mips/ls2k-reset.c @@ -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 Management1 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, (void *)base + RST_CNT); +} + +static void ls2k_poweroff(void) +{ + /* Clear */ + writel((readl((void *)base + PM1_STS) & 0xffffffff), (void *)base + PM1_STS); + /* Sleep Enable | Soft Off*/ + writel(GENMASK(12, 10)|BIT(13), (void *)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);
Add power management register operations to support reboot and poweroff. Signed-off-by: Qing Zhang <zhangqing@loongson.cn> --- v6-v7: No Change --- drivers/platform/mips/Kconfig | 6 ++++ drivers/platform/mips/Makefile | 1 + drivers/platform/mips/ls2k-reset.c | 53 ++++++++++++++++++++++++++++++ 3 files changed, 60 insertions(+) create mode 100644 drivers/platform/mips/ls2k-reset.c