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power: reset: Add Spreadtrum SC27xx PMIC power off support

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On Spreadtrum platform, we need power off system through external SC27xx
series PMICs including the SC2720, SC2721, SC2723, SC2730 and SC2731 chips.
Thus this patch adds SC27xx series PMICs power-off support.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Baolin Wang 2018-02-26 10:23:14 +08:00 committed by Sebastian Reichel
parent 6ff653e3e8
commit 3f5faf3a06
3 changed files with 76 additions and 0 deletions
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9
drivers/power/reset/Kconfig
View File

@ -225,5 +225,14 @@ config SYSCON_REBOOT_MODE
register, then the bootloader can read it to take different
action according to the mode.
config POWER_RESET_SC27XX
bool "Spreadtrum SC27xx PMIC power-off driver"
depends on MFD_SC27XX_PMIC || COMPILE_TEST
help
This driver supports powering off a system through
Spreadtrum SC27xx series PMICs. The SC27xx series
PMICs includes the SC2720, SC2721, SC2723, SC2730
and SC2731 chips.
endif

1
drivers/power/reset/Makefile
View File

@ -27,3 +27,4 @@ obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o
obj-$(CONFIG_POWER_RESET_ZX) += zx-reboot.o
obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o
obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o
obj-$(CONFIG_POWER_RESET_SC27XX) += sc27xx-poweroff.o

66
drivers/power/reset/sc27xx-poweroff.c Normal file
View File

@ -0,0 +1,66 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Spreadtrum Communications Inc.
* Copyright (C) 2018 Linaro Ltd.
*/
#include <linux/cpu.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/regmap.h>
#include <linux/syscore_ops.h>
#define SC27XX_PWR_PD_HW 0xc2c
#define SC27XX_PWR_OFF_EN BIT(0)
static struct regmap *regmap;
/*
* On Spreadtrum platform, we need power off system through external SC27xx
* series PMICs, and it is one similar SPI bus mapped by regmap to access PMIC,
* which is not fast io access.
*
* So before stopping other cores, we need release other cores' resource by
* taking cpus down to avoid racing regmap or spi mutex lock when poweroff
* system through PMIC.
*/
void sc27xx_poweroff_shutdown(void)
{
#ifdef CONFIG_PM_SLEEP_SMP
int cpu = smp_processor_id();
freeze_secondary_cpus(cpu);
#endif
}
static struct syscore_ops poweroff_syscore_ops = {
.shutdown = sc27xx_poweroff_shutdown,
};
static void sc27xx_poweroff_do_poweroff(void)
{
regmap_write(regmap, SC27XX_PWR_PD_HW, SC27XX_PWR_OFF_EN);
}
static int sc27xx_poweroff_probe(struct platform_device *pdev)
{
if (regmap)
return -EINVAL;
regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!regmap)
return -ENODEV;
pm_power_off = sc27xx_poweroff_do_poweroff;
register_syscore_ops(&poweroff_syscore_ops);
return 0;
}
static struct platform_driver sc27xx_poweroff_driver = {
.probe = sc27xx_poweroff_probe,
.driver = {
.name = "sc27xx-poweroff",
},
};
builtin_platform_driver(sc27xx_poweroff_driver);