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Commit 783cb948 authored by Chris Brand's avatar Chris Brand Committed by Florian Fainelli
Browse files

power: Introduce Broadcom kona reset driver 



This driver supports reset on both BCM21664 and BCM23550.
Code is being moved from arch/arm/mach-bcm/board_bcm21664.c

Signed-off-by: default avatarChris Brand <chris.brand@broadcom.com>
Acked-By: default avatarSebastian Reichel <sre@kernel.org>
Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
parent 34642650

MAINTAINERS

+1 −0
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@@ -2489,6 +2489,7 @@ F: arch/arm64/boot/dts/broadcom/ 
F:	arch/arm/configs/bcm_defconfig

F:	drivers/mmc/host/sdhci-bcm-kona.c

F:	drivers/clocksource/bcm_kona_timer.c

F:	drivers/power/reset/brcm-kona-reset.c



BROADCOM BCM2835 ARM ARCHITECTURE

M:	Stephen Warren <swarren@wwwdotorg.org>

drivers/power/reset/Kconfig

+10 −0
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@@ -46,6 +46,16 @@ config POWER_RESET_AXXIA 


	  Say Y if you have an Axxia family SoC.



config POWER_RESET_BRCMKONA

	bool "Broadcom Kona reset driver"

	depends on ARM || COMPILE_TEST

	default ARCH_BCM_MOBILE

	help

	  This driver provides restart support for Broadcom Kona chips.



	  Say Y here if you have a Broadcom Kona-based board and you wish

	  to have restart support.



config POWER_RESET_BRCMSTB

	bool "Broadcom STB reset driver"

	depends on ARM || MIPS || COMPILE_TEST

drivers/power/reset/Makefile

+1 −0
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@@ -3,6 +3,7 @@ obj-$(CONFIG_POWER_RESET_AT91_POWEROFF) += at91-poweroff.o 
obj-$(CONFIG_POWER_RESET_AT91_RESET) += at91-reset.o

obj-$(CONFIG_POWER_RESET_AT91_SAMA5D2_SHDWC) += at91-sama5d2_shdwc.o

obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o

obj-$(CONFIG_POWER_RESET_BRCMKONA) += brcm-kona-reset.o

obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o

obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o

obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o

drivers/power/reset/brcm-kona-reset.c

0 → 100644
+73 −0
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/*

 * Copyright (C) 2016 Broadcom

 *

 * 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 version 2.

 *

 * This program is distributed "as is" WITHOUT ANY WARRANTY of any

 * kind, whether express or implied; without even the implied warranty

 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */



#include <linux/io.h>

#include <linux/of_address.h>

#include <linux/of_platform.h>

#include <linux/reboot.h>



#define RSTMGR_REG_WR_ACCESS_OFFSET	0

#define RSTMGR_REG_CHIP_SOFT_RST_OFFSET	4



#define RSTMGR_WR_PASSWORD		0xa5a5

#define RSTMGR_WR_PASSWORD_SHIFT	8

#define RSTMGR_WR_ACCESS_ENABLE		1



static void __iomem *kona_reset_base;



static int kona_reset_handler(struct notifier_block *this,

				unsigned long mode, void *cmd)

{

	/*

	 * A soft reset is triggered by writing a 0 to bit 0 of the soft reset

	 * register. To write to that register we must first write the password

	 * and the enable bit in the write access enable register.

	 */

	writel((RSTMGR_WR_PASSWORD << RSTMGR_WR_PASSWORD_SHIFT) |

		RSTMGR_WR_ACCESS_ENABLE,

		kona_reset_base + RSTMGR_REG_WR_ACCESS_OFFSET);

	writel(0, kona_reset_base + RSTMGR_REG_CHIP_SOFT_RST_OFFSET);



	return NOTIFY_DONE;

}



static struct notifier_block kona_reset_nb = {

	.notifier_call = kona_reset_handler,

	.priority = 128,

};



static int kona_reset_probe(struct platform_device *pdev)

{

	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);



	kona_reset_base = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(kona_reset_base))

		return PTR_ERR(kona_reset_base);



	return register_restart_handler(&kona_reset_nb);

}



static const struct of_device_id of_match[] = {

	{ .compatible = "brcm,bcm21664-resetmgr" },

	{},

};



static struct platform_driver bcm_kona_reset_driver = {

	.probe = kona_reset_probe,

	.driver = {

		.name = "brcm-kona-reset",

		.of_match_table = of_match,

	},

};



builtin_platform_driver(bcm_kona_reset_driver);