diff options
Diffstat (limited to 'drivers/power/reset')
| -rw-r--r-- | drivers/power/reset/Kconfig | 27 | ||||
| -rw-r--r-- | drivers/power/reset/Makefile | 3 | ||||
| -rw-r--r-- | drivers/power/reset/brcm-kona-reset.c | 73 | ||||
| -rw-r--r-- | drivers/power/reset/reboot-mode.c | 140 | ||||
| -rw-r--r-- | drivers/power/reset/reboot-mode.h | 14 | ||||
| -rw-r--r-- | drivers/power/reset/syscon-poweroff.c | 2 | ||||
| -rw-r--r-- | drivers/power/reset/syscon-reboot-mode.c | 99 | ||||
| -rw-r--r-- | drivers/power/reset/vexpress-poweroff.c | 4 |
8 files changed, 358 insertions, 4 deletions
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index 9bb2622c2..c74c3f67b 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -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 @@ -148,7 +158,8 @@ config POWER_RESET_XGENE config POWER_RESET_KEYSTONE bool "Keystone reset driver" - depends on ARCH_KEYSTONE + depends on ARCH_KEYSTONE || COMPILE_TEST + depends on HAS_IOMEM select MFD_SYSCON help Reboot support for the KEYSTONE SoCs. @@ -183,5 +194,19 @@ config POWER_RESET_ZX help Reboot support for ZTE SoCs. +config REBOOT_MODE + tristate + +config SYSCON_REBOOT_MODE + tristate "Generic SYSCON regmap reboot mode driver" + depends on OF + depends on MFD_SYSCON + select REBOOT_MODE + help + Say y here will enable reboot mode driver. This will + get reboot mode arguments and store it in SYSCON mapped + register, then the bootloader can read it to take different + action according to the mode. + endif diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index ab7aa8614..1be307c7f 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -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 @@ -21,3 +22,5 @@ obj-$(CONFIG_POWER_RESET_SYSCON) += syscon-reboot.o obj-$(CONFIG_POWER_RESET_SYSCON_POWEROFF) += syscon-poweroff.o obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o obj-$(CONFIG_POWER_RESET_ZX) += zx-reboot.o +obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o +obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o diff --git a/drivers/power/reset/brcm-kona-reset.c b/drivers/power/reset/brcm-kona-reset.c new file mode 100644 index 000000000..8eaa959d8 --- /dev/null +++ b/drivers/power/reset/brcm-kona-reset.c @@ -0,0 +1,73 @@ +/* + * 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); diff --git a/drivers/power/reset/reboot-mode.c b/drivers/power/reset/reboot-mode.c new file mode 100644 index 000000000..2dfbbce0f --- /dev/null +++ b/drivers/power/reset/reboot-mode.c @@ -0,0 +1,140 @@ +/* + * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd + * + * 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. + */ + +#include <linux/device.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/reboot.h> +#include "reboot-mode.h" + +#define PREFIX "mode-" + +struct mode_info { + const char *mode; + u32 magic; + struct list_head list; +}; + +static unsigned int get_reboot_mode_magic(struct reboot_mode_driver *reboot, + const char *cmd) +{ + const char *normal = "normal"; + int magic = 0; + struct mode_info *info; + + if (!cmd) + cmd = normal; + + list_for_each_entry(info, &reboot->head, list) { + if (!strcmp(info->mode, cmd)) { + magic = info->magic; + break; + } + } + + return magic; +} + +static int reboot_mode_notify(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + struct reboot_mode_driver *reboot; + unsigned int magic; + + reboot = container_of(this, struct reboot_mode_driver, reboot_notifier); + magic = get_reboot_mode_magic(reboot, cmd); + if (magic) + reboot->write(reboot, magic); + + return NOTIFY_DONE; +} + +/** + * reboot_mode_register - register a reboot mode driver + * @reboot: reboot mode driver + * + * Returns: 0 on success or a negative error code on failure. + */ +int reboot_mode_register(struct reboot_mode_driver *reboot) +{ + struct mode_info *info; + struct property *prop; + struct device_node *np = reboot->dev->of_node; + size_t len = strlen(PREFIX); + int ret; + + INIT_LIST_HEAD(&reboot->head); + + for_each_property_of_node(np, prop) { + if (strncmp(prop->name, PREFIX, len)) + continue; + + info = devm_kzalloc(reboot->dev, sizeof(*info), GFP_KERNEL); + if (!info) { + ret = -ENOMEM; + goto error; + } + + if (of_property_read_u32(np, prop->name, &info->magic)) { + dev_err(reboot->dev, "reboot mode %s without magic number\n", + info->mode); + devm_kfree(reboot->dev, info); + continue; + } + + info->mode = kstrdup_const(prop->name + len, GFP_KERNEL); + if (!info->mode) { + ret = -ENOMEM; + goto error; + } else if (info->mode[0] == '\0') { + kfree_const(info->mode); + ret = -EINVAL; + dev_err(reboot->dev, "invalid mode name(%s): too short!\n", + prop->name); + goto error; + } + + list_add_tail(&info->list, &reboot->head); + } + + reboot->reboot_notifier.notifier_call = reboot_mode_notify; + register_reboot_notifier(&reboot->reboot_notifier); + + return 0; + +error: + list_for_each_entry(info, &reboot->head, list) + kfree_const(info->mode); + + return ret; +} +EXPORT_SYMBOL_GPL(reboot_mode_register); + +/** + * reboot_mode_unregister - unregister a reboot mode driver + * @reboot: reboot mode driver + */ +int reboot_mode_unregister(struct reboot_mode_driver *reboot) +{ + struct mode_info *info; + + unregister_reboot_notifier(&reboot->reboot_notifier); + + list_for_each_entry(info, &reboot->head, list) + kfree_const(info->mode); + + return 0; +} +EXPORT_SYMBOL_GPL(reboot_mode_unregister); + +MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com"); +MODULE_DESCRIPTION("System reboot mode core library"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/power/reset/reboot-mode.h b/drivers/power/reset/reboot-mode.h new file mode 100644 index 000000000..2491bb71f --- /dev/null +++ b/drivers/power/reset/reboot-mode.h @@ -0,0 +1,14 @@ +#ifndef __REBOOT_MODE_H__ +#define __REBOOT_MODE_H__ + +struct reboot_mode_driver { + struct device *dev; + struct list_head head; + int (*write)(struct reboot_mode_driver *reboot, unsigned int magic); + struct notifier_block reboot_notifier; +}; + +int reboot_mode_register(struct reboot_mode_driver *reboot); +int reboot_mode_unregister(struct reboot_mode_driver *reboot); + +#endif diff --git a/drivers/power/reset/syscon-poweroff.c b/drivers/power/reset/syscon-poweroff.c index 5560b0dbc..b68338399 100644 --- a/drivers/power/reset/syscon-poweroff.c +++ b/drivers/power/reset/syscon-poweroff.c @@ -30,7 +30,7 @@ static struct regmap *map; static u32 offset; static u32 mask; -void syscon_poweroff(void) +static void syscon_poweroff(void) { /* Issue the poweroff */ regmap_write(map, offset, mask); diff --git a/drivers/power/reset/syscon-reboot-mode.c b/drivers/power/reset/syscon-reboot-mode.c new file mode 100644 index 000000000..9e1cba5dd --- /dev/null +++ b/drivers/power/reset/syscon-reboot-mode.c @@ -0,0 +1,99 @@ +/* + * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd + * + * 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. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/reboot.h> +#include <linux/regmap.h> +#include <linux/mfd/syscon.h> +#include "reboot-mode.h" + +struct syscon_reboot_mode { + struct regmap *map; + struct reboot_mode_driver reboot; + u32 offset; + u32 mask; +}; + +static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot, + unsigned int magic) +{ + struct syscon_reboot_mode *syscon_rbm; + int ret; + + syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot); + + ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset, + syscon_rbm->mask, magic); + if (ret < 0) + dev_err(reboot->dev, "update reboot mode bits failed\n"); + + return ret; +} + +static int syscon_reboot_mode_probe(struct platform_device *pdev) +{ + int ret; + struct syscon_reboot_mode *syscon_rbm; + + syscon_rbm = devm_kzalloc(&pdev->dev, sizeof(*syscon_rbm), GFP_KERNEL); + if (!syscon_rbm) + return -ENOMEM; + + syscon_rbm->reboot.dev = &pdev->dev; + syscon_rbm->reboot.write = syscon_reboot_mode_write; + syscon_rbm->mask = 0xffffffff; + + dev_set_drvdata(&pdev->dev, syscon_rbm); + + syscon_rbm->map = syscon_node_to_regmap(pdev->dev.parent->of_node); + if (IS_ERR(syscon_rbm->map)) + return PTR_ERR(syscon_rbm->map); + + if (of_property_read_u32(pdev->dev.of_node, "offset", + &syscon_rbm->offset)) + return -EINVAL; + + of_property_read_u32(pdev->dev.of_node, "mask", &syscon_rbm->mask); + + ret = reboot_mode_register(&syscon_rbm->reboot); + if (ret) + dev_err(&pdev->dev, "can't register reboot mode\n"); + + return ret; +} + +static int syscon_reboot_mode_remove(struct platform_device *pdev) +{ + struct syscon_reboot_mode *syscon_rbm = dev_get_drvdata(&pdev->dev); + + return reboot_mode_unregister(&syscon_rbm->reboot); +} + +static const struct of_device_id syscon_reboot_mode_of_match[] = { + { .compatible = "syscon-reboot-mode" }, + {} +}; + +static struct platform_driver syscon_reboot_mode_driver = { + .probe = syscon_reboot_mode_probe, + .remove = syscon_reboot_mode_remove, + .driver = { + .name = "syscon-reboot-mode", + .of_match_table = syscon_reboot_mode_of_match, + }, +}; +module_platform_driver(syscon_reboot_mode_driver); + +MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com"); +MODULE_DESCRIPTION("SYSCON reboot mode driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/power/reset/vexpress-poweroff.c b/drivers/power/reset/vexpress-poweroff.c index 6a9bf7089..102f95a09 100644 --- a/drivers/power/reset/vexpress-poweroff.c +++ b/drivers/power/reset/vexpress-poweroff.c @@ -74,8 +74,8 @@ static ssize_t vexpress_reset_active_store(struct device *dev, return err ? err : count; } -DEVICE_ATTR(active, S_IRUGO | S_IWUSR, vexpress_reset_active_show, - vexpress_reset_active_store); +static DEVICE_ATTR(active, S_IRUGO | S_IWUSR, vexpress_reset_active_show, + vexpress_reset_active_store); enum vexpress_reset_func { FUNC_RESET, FUNC_SHUTDOWN, FUNC_REBOOT }; |