forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
79 lines
1.9 KiB
79 lines
1.9 KiB
// 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/module.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) |
|
#define SC27XX_SLP_CTRL 0xdf0 |
|
#define SC27XX_LDO_XTL_EN BIT(3) |
|
|
|
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. |
|
*/ |
|
static void sc27xx_poweroff_shutdown(void) |
|
{ |
|
#ifdef CONFIG_HOTPLUG_CPU |
|
int cpu; |
|
|
|
for_each_online_cpu(cpu) { |
|
if (cpu != smp_processor_id()) |
|
remove_cpu(cpu); |
|
} |
|
#endif |
|
} |
|
|
|
static struct syscore_ops poweroff_syscore_ops = { |
|
.shutdown = sc27xx_poweroff_shutdown, |
|
}; |
|
|
|
static void sc27xx_poweroff_do_poweroff(void) |
|
{ |
|
/* Disable the external subsys connection's power firstly */ |
|
regmap_write(regmap, SC27XX_SLP_CTRL, SC27XX_LDO_XTL_EN); |
|
|
|
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", |
|
}, |
|
}; |
|
module_platform_driver(sc27xx_poweroff_driver); |
|
|
|
MODULE_DESCRIPTION("Power off driver for SC27XX PMIC Device"); |
|
MODULE_AUTHOR("Baolin Wang <[email protected]>"); |
|
MODULE_LICENSE("GPL v2");
|
|
|