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ANDROID: reset: hisi-reboot: adb reboot bootloader

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Provide support for the hisi bootloader's reboot reason
functionality

Bug: 146450171
Signed-off-by: Chen Feng <puck.chen@hisilicon.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: Ic866ed27fdc5b9a142abe379febd720523f34964
This commit is contained in:
Chen Feng 2017-02-06 10:51:04 +08:00 committed by Alistair Delva
parent fde6e0c654
commit d32a4878e2
2 changed files with 56 additions and 5 deletions
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2
drivers/power/reset/Kconfig
View File

@ -94,7 +94,7 @@ config POWER_RESET_GPIO_RESTART
create a binding in your devicetree.
config POWER_RESET_HISI
bool "Hisilicon power-off driver"
tristate "Hisilicon power-off driver"
depends on ARCH_HISI
help
Reboot support for Hisilicon boards.

59
drivers/power/reset/hisi-reboot.c
View File

@ -8,26 +8,64 @@
* Author: Haojian Zhuang <haojian.zhuang@linaro.org>
*/
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mfd/syscon.h>
#include <linux/notifier.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h>
#include <asm/system_misc.h>
#include <asm/proc-fns.h>
static void __iomem *base;
static u32 reboot_offset;
static struct regmap *pmu_regmap;
static struct regmap *sctrl_regmap;
#define REBOOT_REASON_BOOTLOADER (0x01)
#define REBOOT_REASON_COLDBOOT (0x00)
#define DDR_BYPASS BIT(31)
#define RST_FLAG_MASK GENMASK(7, 0)
#define PMU_HRST_OFFSET ((0x101) << 2)
#define SCPEREN1_OFFSET (0x170)
static int hisi_restart_handler(struct notifier_block *this,
unsigned long mode, void *cmd)
{
writel_relaxed(0xdeadbeef, base + reboot_offset);
int ret;
char reboot_reason;
if (!cmd || !strcmp(cmd, "bootloader"))
reboot_reason = REBOOT_REASON_BOOTLOADER;
else
reboot_reason = REBOOT_REASON_COLDBOOT;
if (base) {
writel_relaxed(0xdeadbeef, base + reboot_offset);
} else {
ret = regmap_update_bits(pmu_regmap, PMU_HRST_OFFSET,
RST_FLAG_MASK, reboot_reason);
if (ret)
return ret;
ret = regmap_write(sctrl_regmap, SCPEREN1_OFFSET, DDR_BYPASS);
if (ret)
return ret;
ret = regmap_write(sctrl_regmap, reboot_offset, 0xdeadbeef);
if (ret)
return ret;
}
while (1)
cpu_do_idle();
mdelay(1);
return NOTIFY_DONE;
}
@ -44,8 +82,17 @@ static int hisi_reboot_probe(struct platform_device *pdev)
base = of_iomap(np, 0);
if (!base) {
WARN(1, "failed to map base address");
return -ENODEV;
pmu_regmap = syscon_regmap_lookup_by_phandle(np, "pmu-regmap");
if (!pmu_regmap) {
WARN(1, "failed to regmap pmu address");
return -ENODEV;
}
sctrl_regmap = syscon_regmap_lookup_by_phandle(np, "sctrl-regmap");
if (!sctrl_regmap) {
WARN(1, "failed to regmap sctrl address");
return -ENODEV;
}
}
if (of_property_read_u32(np, "reboot-offset", &reboot_offset) < 0) {
@ -66,6 +113,7 @@ static int hisi_reboot_probe(struct platform_device *pdev)
static const struct of_device_id hisi_reboot_of_match[] = {
{ .compatible = "hisilicon,sysctrl" },
{ .compatible = "hisilicon,hi3660-reboot" },
{}
};
@ -77,3 +125,6 @@ static struct platform_driver hisi_reboot_driver = {
},
};
module_platform_driver(hisi_reboot_driver);
MODULE_DESCRIPTION("Reset driver for HiSi SoCs");
MODULE_LICENSE("GPL v2");