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Commit 67778e0e authored by Loc Ho's avatar Loc Ho Committed by Anton Vorontsov
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power: Add APM X-Gene system reboot driver 



Add APM X-Gene SoC system reboot driver. This driver handles only system
reboot. System shutdown is board specific and can be handled by board
driver or GPIO based shutdown driver.

Signed-off-by: default avatarLoc Ho <lho@apm.com>
Signed-off-by: default avatarFeng Kan <fkan@apm.com>
Signed-off-by: default avatarKumar Sankaran <ksankaran@apm.com>
Signed-off-by: default avatarAnton Vorontsov <anton@enomsg.org>
parent 0e81ef58

drivers/power/reset/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -44,3 +44,10 @@ config POWER_RESET_VEXPRESS 
	help

	  Power off and reset support for the ARM Ltd. Versatile

	  Express boards.



config POWER_RESET_XGENE

	bool "APM SoC X-Gene reset driver"

	depends on ARM64

	depends on POWER_RESET

	help

	  Reboot support for the APM SoC X-Gene Eval boards.

drivers/power/reset/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -3,3 +3,4 @@ obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o 
obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o

obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o

obj-$(CONFIG_POWER_RESET_VEXPRESS) += vexpress-poweroff.o

obj-$(CONFIG_POWER_RESET_XGENE) += xgene-reboot.o

drivers/power/reset/xgene-reboot.c

0 → 100644
+103 −0
Original line number Diff line number Diff line 
/*

 * AppliedMicro X-Gene SoC Reboot Driver

 *

 * Copyright (c) 2013, Applied Micro Circuits Corporation

 * Author: Feng Kan <fkan@apm.com>

 * Author: Loc Ho <lho@apm.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License as

 * published by the Free Software Foundation; either version 2 of

 * the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,

 * MA 02111-1307 USA

 *

 * This driver provides system reboot functionality for APM X-Gene SoC.

 * For system shutdown, this is board specify. If a board designer

 * implements GPIO shutdown, use the gpio-poweroff.c driver.

 */

#include <linux/io.h>

#include <linux/of_device.h>

#include <linux/of_address.h>

#include <linux/platform_device.h>

#include <linux/stat.h>

#include <linux/slab.h>

#include <asm/system_misc.h>



struct xgene_reboot_context {

	struct platform_device *pdev;

	void *csr;

	u32 mask;

};



static struct xgene_reboot_context *xgene_restart_ctx;



static void xgene_restart(char str, const char *cmd)

{

	struct xgene_reboot_context *ctx = xgene_restart_ctx;

	unsigned long timeout;



	/* Issue the reboot */

	if (ctx)

		writel(ctx->mask, ctx->csr);



	timeout = jiffies + HZ;

	while (time_before(jiffies, timeout))

		cpu_relax();



	dev_emerg(&ctx->pdev->dev, "Unable to restart system\n");

}



static int xgene_reboot_probe(struct platform_device *pdev)

{

	struct xgene_reboot_context *ctx;



	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);

	if (!ctx) {

		dev_err(&pdev->dev, "out of memory for context\n");

		return -ENODEV;

	}



	ctx->csr = of_iomap(pdev->dev.of_node, 0);

	if (!ctx->csr) {

		devm_kfree(&pdev->dev, ctx);

		dev_err(&pdev->dev, "can not map resource\n");

		return -ENODEV;

	}



	if (of_property_read_u32(pdev->dev.of_node, "mask", &ctx->mask))

		ctx->mask = 0xFFFFFFFF;



	ctx->pdev = pdev;

	arm_pm_restart = xgene_restart;

	xgene_restart_ctx = ctx;



	return 0;

}



static struct of_device_id xgene_reboot_of_match[] = {

	{ .compatible = "apm,xgene-reboot" },

	{}

};



static struct platform_driver xgene_reboot_driver = {

	.probe = xgene_reboot_probe,

	.driver = {

		.name = "xgene-reboot",

		.of_match_table = xgene_reboot_of_match,

	},

};



static int __init xgene_reboot_init(void)

{

	return platform_driver_register(&xgene_reboot_driver);

}

device_initcall(xgene_reboot_init);