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Commit d32a4878 authored by Chen Feng's avatar Chen Feng Committed by Alistair Delva
Browse files

ANDROID: reset: hisi-reboot: adb reboot bootloader 



Provide support for the hisi bootloader's reboot reason
functionality

Bug: 146450171
Signed-off-by: default avatarChen Feng <puck.chen@hisilicon.com>
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
Change-Id: Ic866ed27fdc5b9a142abe379febd720523f34964
parent fde6e0c6

drivers/power/reset/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -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.

drivers/power/reset/hisi-reboot.c

+55 −4
Original line number Diff line number Diff line
@@ -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)

{

	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;

}
@@ -44,9 +82,18 @@ static int hisi_reboot_probe(struct platform_device *pdev) 


	base = of_iomap(np, 0);

	if (!base) {

		WARN(1, "failed to map base address");

		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) {

		pr_err("failed to find reboot-offset property\n");
@@ -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");