diff options
Diffstat (limited to 'kernel/drivers/power/reset')
23 files changed, 2997 insertions, 0 deletions
diff --git a/kernel/drivers/power/reset/Kconfig b/kernel/drivers/power/reset/Kconfig new file mode 100644 index 000000000..17d93a73c --- /dev/null +++ b/kernel/drivers/power/reset/Kconfig @@ -0,0 +1,170 @@ +menuconfig POWER_RESET + bool "Board level reset or power off" + help + Provides a number of drivers which either reset a complete board + or shut it down, by manipulating the main power supply on the board. + + Say Y here to enable board reset and power off + +if POWER_RESET + +config POWER_RESET_AS3722 + bool "ams AS3722 power-off driver" + depends on MFD_AS3722 + help + This driver supports turning off board via a ams AS3722 power-off. + +config POWER_RESET_AT91_POWEROFF + bool "Atmel AT91 poweroff driver" + depends on ARCH_AT91 + default SOC_AT91SAM9 || SOC_SAMA5 + help + This driver supports poweroff for Atmel AT91SAM9 and SAMA5 + SoCs + +config POWER_RESET_AT91_RESET + bool "Atmel AT91 reset driver" + depends on ARCH_AT91 + default SOC_AT91SAM9 || SOC_SAMA5 + help + This driver supports restart for Atmel AT91SAM9 and SAMA5 + SoCs + +config POWER_RESET_AXXIA + bool "LSI Axxia reset driver" + depends on ARCH_AXXIA + help + This driver supports restart for Axxia SoC. + + Say Y if you have an Axxia family SoC. + +config POWER_RESET_BRCMSTB + bool "Broadcom STB reset driver" + depends on ARM || MIPS || COMPILE_TEST + depends on MFD_SYSCON + default ARCH_BRCMSTB + help + This driver provides restart support for Broadcom STB boards. + + Say Y here if you have a Broadcom STB board and you wish + to have restart support. + +config POWER_RESET_GPIO + bool "GPIO power-off driver" + depends on OF_GPIO + help + This driver supports turning off your board via a GPIO line. + If your board needs a GPIO high/low to power down, say Y and + create a binding in your devicetree. + +config POWER_RESET_GPIO_RESTART + bool "GPIO restart driver" + depends on OF_GPIO + help + This driver supports restarting your board via a GPIO line. + If your board needs a GPIO high/low to restart, say Y and + create a binding in your devicetree. + +config POWER_RESET_HISI + bool "Hisilicon power-off driver" + depends on ARCH_HISI + help + Reboot support for Hisilicon boards. + +config POWER_RESET_IMX + bool "IMX6 power-off driver" + depends on POWER_RESET && SOC_IMX6 + help + This driver support power off external PMIC by PMIC_ON_REQ on i.mx6 + boards.If you want to use other pin to control external power,please + say N here or disable in dts to make sure pm_power_off never be + overwrote wrongly by this driver. + +config POWER_RESET_MSM + bool "Qualcomm MSM power-off driver" + depends on ARCH_QCOM + help + Power off and restart support for Qualcomm boards. + +config POWER_RESET_LTC2952 + bool "LTC2952 PowerPath power-off driver" + depends on OF_GPIO + help + This driver supports an external powerdown trigger and board power + down via the LTC2952. Bindings are made in the device tree. + +config POWER_RESET_QNAP + bool "QNAP power-off driver" + depends on OF_GPIO && PLAT_ORION + help + This driver supports turning off QNAP NAS devices by sending + commands to the microcontroller which controls the main power. + + Say Y if you have a QNAP NAS. + +config POWER_RESET_RESTART + bool "Restart power-off driver" + help + Some boards don't actually have the ability to power off. + Instead they restart, and u-boot holds the SoC until the + user presses a key. u-boot then boots into Linux. + +config POWER_RESET_ST + bool "ST restart driver" + depends on ARCH_STI + help + Reset support for STMicroelectronics boards. + +config POWER_RESET_VERSATILE + bool "ARM Versatile family reboot driver" + depends on ARM + depends on MFD_SYSCON + depends on OF + help + Power off and restart support for ARM Versatile family of + reference boards. + +config POWER_RESET_VEXPRESS + bool "ARM Versatile Express power-off and reset driver" + depends on ARM || ARM64 + depends on VEXPRESS_CONFIG + 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 + help + Reboot support for the APM SoC X-Gene Eval boards. + +config POWER_RESET_KEYSTONE + bool "Keystone reset driver" + depends on ARCH_KEYSTONE + select MFD_SYSCON + help + Reboot support for the KEYSTONE SoCs. + +config POWER_RESET_SYSCON + bool "Generic SYSCON regmap reset driver" + depends on OF + select MFD_SYSCON + help + Reboot support for generic SYSCON mapped register reset. + +config POWER_RESET_SYSCON_POWEROFF + bool "Generic SYSCON regmap poweroff driver" + depends on OF + select MFD_SYSCON + help + Poweroff support for generic SYSCON mapped register poweroff. + +config POWER_RESET_RMOBILE + tristate "Renesas R-Mobile reset driver" + depends on ARCH_RMOBILE || COMPILE_TEST + depends on HAS_IOMEM + help + Reboot support for Renesas R-Mobile and SH-Mobile SoCs. + +endif + diff --git a/kernel/drivers/power/reset/Makefile b/kernel/drivers/power/reset/Makefile new file mode 100644 index 000000000..dbe06c368 --- /dev/null +++ b/kernel/drivers/power/reset/Makefile @@ -0,0 +1,21 @@ +obj-$(CONFIG_POWER_RESET_AS3722) += as3722-poweroff.o +obj-$(CONFIG_POWER_RESET_AT91_POWEROFF) += at91-poweroff.o +obj-$(CONFIG_POWER_RESET_AT91_RESET) += at91-reset.o +obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o +obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o +obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o +obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o +obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o +obj-$(CONFIG_POWER_RESET_IMX) += imx-snvs-poweroff.o +obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o +obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o +obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o +obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o +obj-$(CONFIG_POWER_RESET_ST) += st-poweroff.o +obj-$(CONFIG_POWER_RESET_VERSATILE) += arm-versatile-reboot.o +obj-$(CONFIG_POWER_RESET_VEXPRESS) += vexpress-poweroff.o +obj-$(CONFIG_POWER_RESET_XGENE) += xgene-reboot.o +obj-$(CONFIG_POWER_RESET_KEYSTONE) += keystone-reset.o +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 diff --git a/kernel/drivers/power/reset/arm-versatile-reboot.c b/kernel/drivers/power/reset/arm-versatile-reboot.c new file mode 100644 index 000000000..b208073c8 --- /dev/null +++ b/kernel/drivers/power/reset/arm-versatile-reboot.c @@ -0,0 +1,148 @@ +/* + * Copyright (C) 2014 Linaro Ltd. + * + * Author: Linus Walleij <linus.walleij@linaro.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2, as + * published by the Free Software Foundation. + * + */ +#include <linux/init.h> +#include <linux/mfd/syscon.h> +#include <linux/reboot.h> +#include <linux/regmap.h> +#include <linux/of.h> + +#define INTEGRATOR_HDR_CTRL_OFFSET 0x0C +#define INTEGRATOR_HDR_LOCK_OFFSET 0x14 +#define INTEGRATOR_CM_CTRL_RESET (1 << 3) + +#define REALVIEW_SYS_LOCK_OFFSET 0x20 +#define REALVIEW_SYS_RESETCTL_OFFSET 0x40 + +/* Magic unlocking token used on all Versatile boards */ +#define VERSATILE_LOCK_VAL 0xA05F + +/* + * We detect the different syscon types from the compatible strings. + */ +enum versatile_reboot { + INTEGRATOR_REBOOT_CM, + REALVIEW_REBOOT_EB, + REALVIEW_REBOOT_PB1176, + REALVIEW_REBOOT_PB11MP, + REALVIEW_REBOOT_PBA8, + REALVIEW_REBOOT_PBX, +}; + +/* Pointer to the system controller */ +static struct regmap *syscon_regmap; +static enum versatile_reboot versatile_reboot_type; + +static const struct of_device_id versatile_reboot_of_match[] = { + { + .compatible = "arm,core-module-integrator", + .data = (void *)INTEGRATOR_REBOOT_CM + }, + { + .compatible = "arm,realview-eb-syscon", + .data = (void *)REALVIEW_REBOOT_EB, + }, + { + .compatible = "arm,realview-pb1176-syscon", + .data = (void *)REALVIEW_REBOOT_PB1176, + }, + { + .compatible = "arm,realview-pb11mp-syscon", + .data = (void *)REALVIEW_REBOOT_PB11MP, + }, + { + .compatible = "arm,realview-pba8-syscon", + .data = (void *)REALVIEW_REBOOT_PBA8, + }, + { + .compatible = "arm,realview-pbx-syscon", + .data = (void *)REALVIEW_REBOOT_PBX, + }, + {}, +}; + +static int versatile_reboot(struct notifier_block *this, unsigned long mode, + void *cmd) +{ + /* Unlock the reset register */ + /* Then hit reset on the different machines */ + switch (versatile_reboot_type) { + case INTEGRATOR_REBOOT_CM: + regmap_write(syscon_regmap, INTEGRATOR_HDR_LOCK_OFFSET, + VERSATILE_LOCK_VAL); + regmap_update_bits(syscon_regmap, + INTEGRATOR_HDR_CTRL_OFFSET, + INTEGRATOR_CM_CTRL_RESET, + INTEGRATOR_CM_CTRL_RESET); + break; + case REALVIEW_REBOOT_EB: + regmap_write(syscon_regmap, REALVIEW_SYS_LOCK_OFFSET, + VERSATILE_LOCK_VAL); + regmap_write(syscon_regmap, + REALVIEW_SYS_RESETCTL_OFFSET, 0x0008); + break; + case REALVIEW_REBOOT_PB1176: + regmap_write(syscon_regmap, REALVIEW_SYS_LOCK_OFFSET, + VERSATILE_LOCK_VAL); + regmap_write(syscon_regmap, + REALVIEW_SYS_RESETCTL_OFFSET, 0x0100); + break; + case REALVIEW_REBOOT_PB11MP: + case REALVIEW_REBOOT_PBA8: + regmap_write(syscon_regmap, REALVIEW_SYS_LOCK_OFFSET, + VERSATILE_LOCK_VAL); + regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET, + 0x0000); + regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET, + 0x0004); + break; + case REALVIEW_REBOOT_PBX: + regmap_write(syscon_regmap, REALVIEW_SYS_LOCK_OFFSET, + VERSATILE_LOCK_VAL); + regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET, + 0x00f0); + regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET, + 0x00f4); + break; + } + dsb(); + + return NOTIFY_DONE; +} + +static struct notifier_block versatile_reboot_nb = { + .notifier_call = versatile_reboot, + .priority = 192, +}; + +static int __init versatile_reboot_probe(void) +{ + const struct of_device_id *reboot_id; + struct device_node *np; + int err; + + np = of_find_matching_node_and_match(NULL, versatile_reboot_of_match, + &reboot_id); + if (!np) + return -ENODEV; + versatile_reboot_type = (enum versatile_reboot)reboot_id->data; + + syscon_regmap = syscon_node_to_regmap(np); + if (IS_ERR(syscon_regmap)) + return PTR_ERR(syscon_regmap); + + err = register_restart_handler(&versatile_reboot_nb); + if (err) + return err; + + pr_info("versatile reboot driver registered\n"); + return 0; +} +device_initcall(versatile_reboot_probe); diff --git a/kernel/drivers/power/reset/as3722-poweroff.c b/kernel/drivers/power/reset/as3722-poweroff.c new file mode 100644 index 000000000..60d0295ff --- /dev/null +++ b/kernel/drivers/power/reset/as3722-poweroff.c @@ -0,0 +1,95 @@ +/* + * Power off driver for ams AS3722 device. + * + * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. + * + * Author: Laxman Dewangan <ldewangan@nvidia.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + */ + +#include <linux/mfd/as3722.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +struct as3722_poweroff { + struct device *dev; + struct as3722 *as3722; +}; + +static struct as3722_poweroff *as3722_pm_poweroff; + +static void as3722_pm_power_off(void) +{ + int ret; + + if (!as3722_pm_poweroff) { + pr_err("AS3722 poweroff is not initialised\n"); + return; + } + + ret = as3722_update_bits(as3722_pm_poweroff->as3722, + AS3722_RESET_CONTROL_REG, AS3722_POWER_OFF, AS3722_POWER_OFF); + if (ret < 0) + dev_err(as3722_pm_poweroff->dev, + "RESET_CONTROL_REG update failed, %d\n", ret); +} + +static int as3722_poweroff_probe(struct platform_device *pdev) +{ + struct as3722_poweroff *as3722_poweroff; + struct device_node *np = pdev->dev.parent->of_node; + + if (!np) + return -EINVAL; + + if (!of_property_read_bool(np, "ams,system-power-controller")) + return 0; + + as3722_poweroff = devm_kzalloc(&pdev->dev, sizeof(*as3722_poweroff), + GFP_KERNEL); + if (!as3722_poweroff) + return -ENOMEM; + + as3722_poweroff->as3722 = dev_get_drvdata(pdev->dev.parent); + as3722_poweroff->dev = &pdev->dev; + as3722_pm_poweroff = as3722_poweroff; + if (!pm_power_off) + pm_power_off = as3722_pm_power_off; + + return 0; +} + +static int as3722_poweroff_remove(struct platform_device *pdev) +{ + if (pm_power_off == as3722_pm_power_off) + pm_power_off = NULL; + as3722_pm_poweroff = NULL; + + return 0; +} + +static struct platform_driver as3722_poweroff_driver = { + .driver = { + .name = "as3722-power-off", + }, + .probe = as3722_poweroff_probe, + .remove = as3722_poweroff_remove, +}; + +module_platform_driver(as3722_poweroff_driver); + +MODULE_DESCRIPTION("Power off driver for ams AS3722 PMIC Device"); +MODULE_ALIAS("platform:as3722-power-off"); +MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/kernel/drivers/power/reset/at91-poweroff.c b/kernel/drivers/power/reset/at91-poweroff.c new file mode 100644 index 000000000..9847cfb7e --- /dev/null +++ b/kernel/drivers/power/reset/at91-poweroff.c @@ -0,0 +1,157 @@ +/* + * Atmel AT91 SAM9 SoCs reset code + * + * Copyright (C) 2007 Atmel Corporation. + * Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> + * Copyright (C) 2014 Free Electrons + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/printk.h> + +#define AT91_SHDW_CR 0x00 /* Shut Down Control Register */ +#define AT91_SHDW_SHDW BIT(0) /* Shut Down command */ +#define AT91_SHDW_KEY (0xa5 << 24) /* KEY Password */ + +#define AT91_SHDW_MR 0x04 /* Shut Down Mode Register */ +#define AT91_SHDW_WKMODE0 GENMASK(2, 0) /* Wake-up 0 Mode Selection */ +#define AT91_SHDW_CPTWK0_MAX 0xf /* Maximum Counter On Wake Up 0 */ +#define AT91_SHDW_CPTWK0 (AT91_SHDW_CPTWK0_MAX << 4) /* Counter On Wake Up 0 */ +#define AT91_SHDW_CPTWK0_(x) ((x) << 4) +#define AT91_SHDW_RTTWKEN BIT(16) /* Real Time Timer Wake-up Enable */ +#define AT91_SHDW_RTCWKEN BIT(17) /* Real Time Clock Wake-up Enable */ + +#define AT91_SHDW_SR 0x08 /* Shut Down Status Register */ +#define AT91_SHDW_WAKEUP0 BIT(0) /* Wake-up 0 Status */ +#define AT91_SHDW_RTTWK BIT(16) /* Real-time Timer Wake-up */ +#define AT91_SHDW_RTCWK BIT(17) /* Real-time Clock Wake-up [SAM9RL] */ + +enum wakeup_type { + AT91_SHDW_WKMODE0_NONE = 0, + AT91_SHDW_WKMODE0_HIGH = 1, + AT91_SHDW_WKMODE0_LOW = 2, + AT91_SHDW_WKMODE0_ANYLEVEL = 3, +}; + +static const char *shdwc_wakeup_modes[] = { + [AT91_SHDW_WKMODE0_NONE] = "none", + [AT91_SHDW_WKMODE0_HIGH] = "high", + [AT91_SHDW_WKMODE0_LOW] = "low", + [AT91_SHDW_WKMODE0_ANYLEVEL] = "any", +}; + +static void __iomem *at91_shdwc_base; + +static void __init at91_wakeup_status(void) +{ + u32 reg = readl(at91_shdwc_base + AT91_SHDW_SR); + char *reason = "unknown"; + + /* Simple power-on, just bail out */ + if (!reg) + return; + + if (reg & AT91_SHDW_RTTWK) + reason = "RTT"; + else if (reg & AT91_SHDW_RTCWK) + reason = "RTC"; + + pr_info("AT91: Wake-Up source: %s\n", reason); +} + +static void at91_poweroff(void) +{ + writel(AT91_SHDW_KEY | AT91_SHDW_SHDW, at91_shdwc_base + AT91_SHDW_CR); +} + +static int at91_poweroff_get_wakeup_mode(struct device_node *np) +{ + const char *pm; + unsigned int i; + int err; + + err = of_property_read_string(np, "atmel,wakeup-mode", &pm); + if (err < 0) + return AT91_SHDW_WKMODE0_ANYLEVEL; + + for (i = 0; i < ARRAY_SIZE(shdwc_wakeup_modes); i++) + if (!strcasecmp(pm, shdwc_wakeup_modes[i])) + return i; + + return -ENODEV; +} + +static void at91_poweroff_dt_set_wakeup_mode(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + int wakeup_mode; + u32 mode = 0, tmp; + + wakeup_mode = at91_poweroff_get_wakeup_mode(np); + if (wakeup_mode < 0) { + dev_warn(&pdev->dev, "shdwc unknown wakeup mode\n"); + return; + } + + if (!of_property_read_u32(np, "atmel,wakeup-counter", &tmp)) { + if (tmp > AT91_SHDW_CPTWK0_MAX) { + dev_warn(&pdev->dev, + "shdwc wakeup counter 0x%x > 0x%x reduce it to 0x%x\n", + tmp, AT91_SHDW_CPTWK0_MAX, AT91_SHDW_CPTWK0_MAX); + tmp = AT91_SHDW_CPTWK0_MAX; + } + mode |= AT91_SHDW_CPTWK0_(tmp); + } + + if (of_property_read_bool(np, "atmel,wakeup-rtc-timer")) + mode |= AT91_SHDW_RTCWKEN; + + if (of_property_read_bool(np, "atmel,wakeup-rtt-timer")) + mode |= AT91_SHDW_RTTWKEN; + + writel(wakeup_mode | mode, at91_shdwc_base + AT91_SHDW_MR); +} + +static int at91_poweroff_probe(struct platform_device *pdev) +{ + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + at91_shdwc_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(at91_shdwc_base)) { + dev_err(&pdev->dev, "Could not map reset controller address\n"); + return PTR_ERR(at91_shdwc_base); + } + + at91_wakeup_status(); + + if (pdev->dev.of_node) + at91_poweroff_dt_set_wakeup_mode(pdev); + + pm_power_off = at91_poweroff; + + return 0; +} + +static const struct of_device_id at91_poweroff_of_match[] = { + { .compatible = "atmel,at91sam9260-shdwc", }, + { .compatible = "atmel,at91sam9rl-shdwc", }, + { .compatible = "atmel,at91sam9x5-shdwc", }, + { /*sentinel*/ } +}; + +static struct platform_driver at91_poweroff_driver = { + .probe = at91_poweroff_probe, + .driver = { + .name = "at91-poweroff", + .of_match_table = at91_poweroff_of_match, + }, +}; +module_platform_driver(at91_poweroff_driver); diff --git a/kernel/drivers/power/reset/at91-reset.c b/kernel/drivers/power/reset/at91-reset.c new file mode 100644 index 000000000..ca461ebc7 --- /dev/null +++ b/kernel/drivers/power/reset/at91-reset.c @@ -0,0 +1,260 @@ +/* + * Atmel AT91 SAM9 SoCs reset code + * + * Copyright (C) 2007 Atmel Corporation. + * Copyright (C) BitBox Ltd 2010 + * Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcosoft.com> + * Copyright (C) 2014 Free Electrons + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/reboot.h> + +#include <soc/at91/at91sam9_ddrsdr.h> +#include <soc/at91/at91sam9_sdramc.h> + +#define AT91_RSTC_CR 0x00 /* Reset Controller Control Register */ +#define AT91_RSTC_PROCRST BIT(0) /* Processor Reset */ +#define AT91_RSTC_PERRST BIT(2) /* Peripheral Reset */ +#define AT91_RSTC_EXTRST BIT(3) /* External Reset */ +#define AT91_RSTC_KEY (0xa5 << 24) /* KEY Password */ + +#define AT91_RSTC_SR 0x04 /* Reset Controller Status Register */ +#define AT91_RSTC_URSTS BIT(0) /* User Reset Status */ +#define AT91_RSTC_RSTTYP GENMASK(10, 8) /* Reset Type */ +#define AT91_RSTC_NRSTL BIT(16) /* NRST Pin Level */ +#define AT91_RSTC_SRCMP BIT(17) /* Software Reset Command in Progress */ + +#define AT91_RSTC_MR 0x08 /* Reset Controller Mode Register */ +#define AT91_RSTC_URSTEN BIT(0) /* User Reset Enable */ +#define AT91_RSTC_URSTIEN BIT(4) /* User Reset Interrupt Enable */ +#define AT91_RSTC_ERSTL GENMASK(11, 8) /* External Reset Length */ + +enum reset_type { + RESET_TYPE_GENERAL = 0, + RESET_TYPE_WAKEUP = 1, + RESET_TYPE_WATCHDOG = 2, + RESET_TYPE_SOFTWARE = 3, + RESET_TYPE_USER = 4, +}; + +static void __iomem *at91_ramc_base[2], *at91_rstc_base; + +/* +* unless the SDRAM is cleanly shutdown before we hit the +* reset register it can be left driving the data bus and +* killing the chance of a subsequent boot from NAND +*/ +static int at91sam9260_restart(struct notifier_block *this, unsigned long mode, + void *cmd) +{ + asm volatile( + /* Align to cache lines */ + ".balign 32\n\t" + + /* Disable SDRAM accesses */ + "str %2, [%0, #" __stringify(AT91_SDRAMC_TR) "]\n\t" + + /* Power down SDRAM */ + "str %3, [%0, #" __stringify(AT91_SDRAMC_LPR) "]\n\t" + + /* Reset CPU */ + "str %4, [%1, #" __stringify(AT91_RSTC_CR) "]\n\t" + + "b .\n\t" + : + : "r" (at91_ramc_base[0]), + "r" (at91_rstc_base), + "r" (1), + "r" cpu_to_le32(AT91_SDRAMC_LPCB_POWER_DOWN), + "r" cpu_to_le32(AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST)); + + return NOTIFY_DONE; +} + +static int at91sam9g45_restart(struct notifier_block *this, unsigned long mode, + void *cmd) +{ + asm volatile( + /* + * Test wether we have a second RAM controller to care + * about. + * + * First, test that we can dereference the virtual address. + */ + "cmp %1, #0\n\t" + "beq 1f\n\t" + + /* Then, test that the RAM controller is enabled */ + "ldr r0, [%1]\n\t" + "cmp r0, #0\n\t" + + /* Align to cache lines */ + ".balign 32\n\t" + + /* Disable SDRAM0 accesses */ + "1: str %3, [%0, #" __stringify(AT91_DDRSDRC_RTR) "]\n\t" + /* Power down SDRAM0 */ + " str %4, [%0, #" __stringify(AT91_DDRSDRC_LPR) "]\n\t" + /* Disable SDRAM1 accesses */ + " strne %3, [%1, #" __stringify(AT91_DDRSDRC_RTR) "]\n\t" + /* Power down SDRAM1 */ + " strne %4, [%1, #" __stringify(AT91_DDRSDRC_LPR) "]\n\t" + /* Reset CPU */ + " str %5, [%2, #" __stringify(AT91_RSTC_CR) "]\n\t" + + " b .\n\t" + : + : "r" (at91_ramc_base[0]), + "r" (at91_ramc_base[1]), + "r" (at91_rstc_base), + "r" (1), + "r" cpu_to_le32(AT91_DDRSDRC_LPCB_POWER_DOWN), + "r" cpu_to_le32(AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST) + : "r0"); + + return NOTIFY_DONE; +} + +static void __init at91_reset_status(struct platform_device *pdev) +{ + u32 reg = readl(at91_rstc_base + AT91_RSTC_SR); + char *reason; + + switch ((reg & AT91_RSTC_RSTTYP) >> 8) { + case RESET_TYPE_GENERAL: + reason = "general reset"; + break; + case RESET_TYPE_WAKEUP: + reason = "wakeup"; + break; + case RESET_TYPE_WATCHDOG: + reason = "watchdog reset"; + break; + case RESET_TYPE_SOFTWARE: + reason = "software reset"; + break; + case RESET_TYPE_USER: + reason = "user reset"; + break; + default: + reason = "unknown reset"; + break; + } + + pr_info("AT91: Starting after %s\n", reason); +} + +static const struct of_device_id at91_ramc_of_match[] = { + { .compatible = "atmel,at91sam9260-sdramc", }, + { .compatible = "atmel,at91sam9g45-ddramc", }, + { .compatible = "atmel,sama5d3-ddramc", }, + { /* sentinel */ } +}; + +static const struct of_device_id at91_reset_of_match[] = { + { .compatible = "atmel,at91sam9260-rstc", .data = at91sam9260_restart }, + { .compatible = "atmel,at91sam9g45-rstc", .data = at91sam9g45_restart }, + { /* sentinel */ } +}; + +static struct notifier_block at91_restart_nb = { + .priority = 192, +}; + +static int at91_reset_of_probe(struct platform_device *pdev) +{ + const struct of_device_id *match; + struct device_node *np; + int idx = 0; + + at91_rstc_base = of_iomap(pdev->dev.of_node, 0); + if (!at91_rstc_base) { + dev_err(&pdev->dev, "Could not map reset controller address\n"); + return -ENODEV; + } + + for_each_matching_node(np, at91_ramc_of_match) { + at91_ramc_base[idx] = of_iomap(np, 0); + if (!at91_ramc_base[idx]) { + dev_err(&pdev->dev, "Could not map ram controller address\n"); + return -ENODEV; + } + idx++; + } + + match = of_match_node(at91_reset_of_match, pdev->dev.of_node); + at91_restart_nb.notifier_call = match->data; + return register_restart_handler(&at91_restart_nb); +} + +static int at91_reset_platform_probe(struct platform_device *pdev) +{ + const struct platform_device_id *match; + struct resource *res; + int idx = 0; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + at91_rstc_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(at91_rstc_base)) { + dev_err(&pdev->dev, "Could not map reset controller address\n"); + return PTR_ERR(at91_rstc_base); + } + + for (idx = 0; idx < 2; idx++) { + res = platform_get_resource(pdev, IORESOURCE_MEM, idx + 1 ); + at91_ramc_base[idx] = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!at91_ramc_base[idx]) { + dev_err(&pdev->dev, "Could not map ram controller address\n"); + return -ENOMEM; + } + } + + match = platform_get_device_id(pdev); + at91_restart_nb.notifier_call = + (int (*)(struct notifier_block *, + unsigned long, void *)) match->driver_data; + + return register_restart_handler(&at91_restart_nb); +} + +static int at91_reset_probe(struct platform_device *pdev) +{ + int ret; + + if (pdev->dev.of_node) + ret = at91_reset_of_probe(pdev); + else + ret = at91_reset_platform_probe(pdev); + + if (ret) + return ret; + + at91_reset_status(pdev); + + return 0; +} + +static struct platform_device_id at91_reset_plat_match[] = { + { "at91-sam9260-reset", (unsigned long)at91sam9260_restart }, + { "at91-sam9g45-reset", (unsigned long)at91sam9g45_restart }, + { /* sentinel */ } +}; + +static struct platform_driver at91_reset_driver = { + .probe = at91_reset_probe, + .driver = { + .name = "at91-reset", + .of_match_table = at91_reset_of_match, + }, + .id_table = at91_reset_plat_match, +}; +module_platform_driver(at91_reset_driver); diff --git a/kernel/drivers/power/reset/axxia-reset.c b/kernel/drivers/power/reset/axxia-reset.c new file mode 100644 index 000000000..4e4cd1c8f --- /dev/null +++ b/kernel/drivers/power/reset/axxia-reset.c @@ -0,0 +1,97 @@ +/* + * Reset driver for Axxia devices + * + * Copyright (C) 2014 LSI + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * 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. + * + */ +#include <linux/init.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/notifier.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/reboot.h> +#include <linux/regmap.h> + +#define SC_CRIT_WRITE_KEY 0x1000 +#define SC_LATCH_ON_RESET 0x1004 +#define SC_RESET_CONTROL 0x1008 +#define RSTCTL_RST_ZERO (1<<3) +#define RSTCTL_RST_FAB (1<<2) +#define RSTCTL_RST_CHIP (1<<1) +#define RSTCTL_RST_SYS (1<<0) +#define SC_EFUSE_INT_STATUS 0x180c +#define EFUSE_READ_DONE (1<<31) + +static struct regmap *syscon; + +static int axxia_restart_handler(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + /* Access Key (0xab) */ + regmap_write(syscon, SC_CRIT_WRITE_KEY, 0xab); + /* Select internal boot from 0xffff0000 */ + regmap_write(syscon, SC_LATCH_ON_RESET, 0x00000040); + /* Assert ResetReadDone (to avoid hanging in boot ROM) */ + regmap_write(syscon, SC_EFUSE_INT_STATUS, EFUSE_READ_DONE); + /* Assert chip reset */ + regmap_update_bits(syscon, SC_RESET_CONTROL, + RSTCTL_RST_CHIP, RSTCTL_RST_CHIP); + + return NOTIFY_DONE; +} + +static struct notifier_block axxia_restart_nb = { + .notifier_call = axxia_restart_handler, + .priority = 128, +}; + +static int axxia_reset_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + int err; + + syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon"); + if (IS_ERR(syscon)) { + pr_err("%s: syscon lookup failed\n", dev->of_node->name); + return PTR_ERR(syscon); + } + + err = register_restart_handler(&axxia_restart_nb); + if (err) + dev_err(dev, "cannot register restart handler (err=%d)\n", err); + + return err; +} + +static const struct of_device_id of_axxia_reset_match[] = { + { .compatible = "lsi,axm55xx-reset", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_axxia_reset_match); + +static struct platform_driver axxia_reset_driver = { + .probe = axxia_reset_probe, + .driver = { + .name = "axxia-reset", + .of_match_table = of_match_ptr(of_axxia_reset_match), + }, +}; + +static int __init axxia_reset_init(void) +{ + return platform_driver_register(&axxia_reset_driver); +} +device_initcall(axxia_reset_init); diff --git a/kernel/drivers/power/reset/brcmstb-reboot.c b/kernel/drivers/power/reset/brcmstb-reboot.c new file mode 100644 index 000000000..884b53c48 --- /dev/null +++ b/kernel/drivers/power/reset/brcmstb-reboot.c @@ -0,0 +1,156 @@ +/* + * Copyright (C) 2013 Broadcom Corporation + * + * 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/bitops.h> +#include <linux/device.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/jiffies.h> +#include <linux/notifier.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/printk.h> +#include <linux/reboot.h> +#include <linux/regmap.h> +#include <linux/smp.h> +#include <linux/mfd/syscon.h> + +#define RESET_SOURCE_ENABLE_REG 1 +#define SW_MASTER_RESET_REG 2 + +static struct regmap *regmap; +static u32 rst_src_en; +static u32 sw_mstr_rst; + +struct reset_reg_mask { + u32 rst_src_en_mask; + u32 sw_mstr_rst_mask; +}; + +static const struct reset_reg_mask *reset_masks; + +static int brcmstb_restart_handler(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + int rc; + u32 tmp; + + rc = regmap_write(regmap, rst_src_en, reset_masks->rst_src_en_mask); + if (rc) { + pr_err("failed to write rst_src_en (%d)\n", rc); + return NOTIFY_DONE; + } + + rc = regmap_read(regmap, rst_src_en, &tmp); + if (rc) { + pr_err("failed to read rst_src_en (%d)\n", rc); + return NOTIFY_DONE; + } + + rc = regmap_write(regmap, sw_mstr_rst, reset_masks->sw_mstr_rst_mask); + if (rc) { + pr_err("failed to write sw_mstr_rst (%d)\n", rc); + return NOTIFY_DONE; + } + + rc = regmap_read(regmap, sw_mstr_rst, &tmp); + if (rc) { + pr_err("failed to read sw_mstr_rst (%d)\n", rc); + return NOTIFY_DONE; + } + + while (1) + ; + + return NOTIFY_DONE; +} + +static struct notifier_block brcmstb_restart_nb = { + .notifier_call = brcmstb_restart_handler, + .priority = 128, +}; + +static const struct reset_reg_mask reset_bits_40nm = { + .rst_src_en_mask = BIT(0), + .sw_mstr_rst_mask = BIT(0), +}; + +static const struct reset_reg_mask reset_bits_65nm = { + .rst_src_en_mask = BIT(3), + .sw_mstr_rst_mask = BIT(31), +}; + +static const struct of_device_id of_match[] = { + { .compatible = "brcm,brcmstb-reboot", .data = &reset_bits_40nm }, + { .compatible = "brcm,bcm7038-reboot", .data = &reset_bits_65nm }, + {}, +}; + +static int brcmstb_reboot_probe(struct platform_device *pdev) +{ + int rc; + struct device_node *np = pdev->dev.of_node; + const struct of_device_id *of_id; + + of_id = of_match_node(of_match, np); + if (!of_id) { + pr_err("failed to look up compatible string\n"); + return -EINVAL; + } + reset_masks = of_id->data; + + regmap = syscon_regmap_lookup_by_phandle(np, "syscon"); + if (IS_ERR(regmap)) { + pr_err("failed to get syscon phandle\n"); + return -EINVAL; + } + + rc = of_property_read_u32_index(np, "syscon", RESET_SOURCE_ENABLE_REG, + &rst_src_en); + if (rc) { + pr_err("can't get rst_src_en offset (%d)\n", rc); + return -EINVAL; + } + + rc = of_property_read_u32_index(np, "syscon", SW_MASTER_RESET_REG, + &sw_mstr_rst); + if (rc) { + pr_err("can't get sw_mstr_rst offset (%d)\n", rc); + return -EINVAL; + } + + rc = register_restart_handler(&brcmstb_restart_nb); + if (rc) + dev_err(&pdev->dev, + "cannot register restart handler (err=%d)\n", rc); + + return rc; +} + +static struct platform_driver brcmstb_reboot_driver = { + .probe = brcmstb_reboot_probe, + .driver = { + .name = "brcmstb-reboot", + .of_match_table = of_match, + }, +}; + +static int __init brcmstb_reboot_init(void) +{ + return platform_driver_probe(&brcmstb_reboot_driver, + brcmstb_reboot_probe); +} +subsys_initcall(brcmstb_reboot_init); diff --git a/kernel/drivers/power/reset/gpio-poweroff.c b/kernel/drivers/power/reset/gpio-poweroff.c new file mode 100644 index 000000000..e5332f1db --- /dev/null +++ b/kernel/drivers/power/reset/gpio-poweroff.c @@ -0,0 +1,111 @@ +/* + * Toggles a GPIO pin to power down a device + * + * Jamie Lentin <jm@lentin.co.uk> + * Andrew Lunn <andrew@lunn.ch> + * + * Copyright (C) 2012 Jamie Lentin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/gpio/consumer.h> +#include <linux/of_platform.h> +#include <linux/module.h> + +/* + * Hold configuration here, cannot be more than one instance of the driver + * since pm_power_off itself is global. + */ +static struct gpio_desc *reset_gpio; + +static void gpio_poweroff_do_poweroff(void) +{ + BUG_ON(!reset_gpio); + + /* drive it active, also inactive->active edge */ + gpiod_direction_output(reset_gpio, 1); + mdelay(100); + /* drive inactive, also active->inactive edge */ + gpiod_set_value(reset_gpio, 0); + mdelay(100); + + /* drive it active, also inactive->active edge */ + gpiod_set_value(reset_gpio, 1); + + /* give it some time */ + mdelay(3000); + + WARN_ON(1); +} + +static int gpio_poweroff_probe(struct platform_device *pdev) +{ + bool input = false; + + /* If a pm_power_off function has already been added, leave it alone */ + if (pm_power_off != NULL) { + dev_err(&pdev->dev, + "%s: pm_power_off function already registered", + __func__); + return -EBUSY; + } + + reset_gpio = devm_gpiod_get(&pdev->dev, NULL); + if (IS_ERR(reset_gpio)) + return PTR_ERR(reset_gpio); + + input = of_property_read_bool(pdev->dev.of_node, "input"); + + if (input) { + if (gpiod_direction_input(reset_gpio)) { + dev_err(&pdev->dev, + "Could not set direction of reset GPIO to input\n"); + return -ENODEV; + } + } else { + if (gpiod_direction_output(reset_gpio, 0)) { + dev_err(&pdev->dev, + "Could not set direction of reset GPIO\n"); + return -ENODEV; + } + } + + pm_power_off = &gpio_poweroff_do_poweroff; + return 0; +} + +static int gpio_poweroff_remove(struct platform_device *pdev) +{ + if (pm_power_off == &gpio_poweroff_do_poweroff) + pm_power_off = NULL; + + return 0; +} + +static const struct of_device_id of_gpio_poweroff_match[] = { + { .compatible = "gpio-poweroff", }, + {}, +}; + +static struct platform_driver gpio_poweroff_driver = { + .probe = gpio_poweroff_probe, + .remove = gpio_poweroff_remove, + .driver = { + .name = "poweroff-gpio", + .of_match_table = of_gpio_poweroff_match, + }, +}; + +module_platform_driver(gpio_poweroff_driver); + +MODULE_AUTHOR("Jamie Lentin <jm@lentin.co.uk>"); +MODULE_DESCRIPTION("GPIO poweroff driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:poweroff-gpio"); diff --git a/kernel/drivers/power/reset/gpio-restart.c b/kernel/drivers/power/reset/gpio-restart.c new file mode 100644 index 000000000..edb327efe --- /dev/null +++ b/kernel/drivers/power/reset/gpio-restart.c @@ -0,0 +1,148 @@ +/* + * Toggles a GPIO pin to restart a device + * + * Copyright (C) 2014 Google, Inc. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + * + * Based on the gpio-poweroff driver. + */ +#include <linux/reboot.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/gpio/consumer.h> +#include <linux/of_platform.h> +#include <linux/module.h> + +struct gpio_restart { + struct gpio_desc *reset_gpio; + struct notifier_block restart_handler; + u32 active_delay_ms; + u32 inactive_delay_ms; + u32 wait_delay_ms; +}; + +static int gpio_restart_notify(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + struct gpio_restart *gpio_restart = + container_of(this, struct gpio_restart, restart_handler); + + /* drive it active, also inactive->active edge */ + gpiod_direction_output(gpio_restart->reset_gpio, 1); + mdelay(gpio_restart->active_delay_ms); + + /* drive inactive, also active->inactive edge */ + gpiod_set_value(gpio_restart->reset_gpio, 0); + mdelay(gpio_restart->inactive_delay_ms); + + /* drive it active, also inactive->active edge */ + gpiod_set_value(gpio_restart->reset_gpio, 1); + + /* give it some time */ + mdelay(gpio_restart->wait_delay_ms); + + WARN_ON(1); + + return NOTIFY_DONE; +} + +static int gpio_restart_probe(struct platform_device *pdev) +{ + struct gpio_restart *gpio_restart; + bool open_source = false; + u32 property; + int ret; + + gpio_restart = devm_kzalloc(&pdev->dev, sizeof(*gpio_restart), + GFP_KERNEL); + if (!gpio_restart) + return -ENOMEM; + + open_source = of_property_read_bool(pdev->dev.of_node, "open-source"); + + gpio_restart->reset_gpio = devm_gpiod_get(&pdev->dev, NULL, + open_source ? GPIOD_IN : GPIOD_OUT_LOW); + if (IS_ERR(gpio_restart->reset_gpio)) { + dev_err(&pdev->dev, "Could net get reset GPIO\n"); + return PTR_ERR(gpio_restart->reset_gpio); + } + + gpio_restart->restart_handler.notifier_call = gpio_restart_notify; + gpio_restart->restart_handler.priority = 128; + gpio_restart->active_delay_ms = 100; + gpio_restart->inactive_delay_ms = 100; + gpio_restart->wait_delay_ms = 3000; + + ret = of_property_read_u32(pdev->dev.of_node, "priority", &property); + if (!ret) { + if (property > 255) + dev_err(&pdev->dev, "Invalid priority property: %u\n", + property); + else + gpio_restart->restart_handler.priority = property; + } + + of_property_read_u32(pdev->dev.of_node, "active-delay", + &gpio_restart->active_delay_ms); + of_property_read_u32(pdev->dev.of_node, "inactive-delay", + &gpio_restart->inactive_delay_ms); + of_property_read_u32(pdev->dev.of_node, "wait-delay", + &gpio_restart->wait_delay_ms); + + platform_set_drvdata(pdev, gpio_restart); + + ret = register_restart_handler(&gpio_restart->restart_handler); + if (ret) { + dev_err(&pdev->dev, "%s: cannot register restart handler, %d\n", + __func__, ret); + return -ENODEV; + } + + return 0; +} + +static int gpio_restart_remove(struct platform_device *pdev) +{ + struct gpio_restart *gpio_restart = platform_get_drvdata(pdev); + int ret; + + ret = unregister_restart_handler(&gpio_restart->restart_handler); + if (ret) { + dev_err(&pdev->dev, + "%s: cannot unregister restart handler, %d\n", + __func__, ret); + return -ENODEV; + } + + return 0; +} + +static const struct of_device_id of_gpio_restart_match[] = { + { .compatible = "gpio-restart", }, + {}, +}; + +static struct platform_driver gpio_restart_driver = { + .probe = gpio_restart_probe, + .remove = gpio_restart_remove, + .driver = { + .name = "restart-gpio", + .of_match_table = of_gpio_restart_match, + }, +}; + +module_platform_driver(gpio_restart_driver); + +MODULE_AUTHOR("David Riley <davidriley@chromium.org>"); +MODULE_DESCRIPTION("GPIO restart driver"); +MODULE_LICENSE("GPL"); diff --git a/kernel/drivers/power/reset/hisi-reboot.c b/kernel/drivers/power/reset/hisi-reboot.c new file mode 100644 index 000000000..9ab7f562a --- /dev/null +++ b/kernel/drivers/power/reset/hisi-reboot.c @@ -0,0 +1,79 @@ +/* + * Hisilicon SoC reset code + * + * Copyright (c) 2014 Hisilicon Ltd. + * Copyright (c) 2014 Linaro Ltd. + * + * Author: Haojian Zhuang <haojian.zhuang@linaro.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/notifier.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/reboot.h> + +#include <asm/proc-fns.h> + +static void __iomem *base; +static u32 reboot_offset; + +static int hisi_restart_handler(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + writel_relaxed(0xdeadbeef, base + reboot_offset); + + while (1) + cpu_do_idle(); + + return NOTIFY_DONE; +} + +static struct notifier_block hisi_restart_nb = { + .notifier_call = hisi_restart_handler, + .priority = 128, +}; + +static int hisi_reboot_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + int err; + + base = of_iomap(np, 0); + if (!base) { + WARN(1, "failed to map base address"); + return -ENODEV; + } + + if (of_property_read_u32(np, "reboot-offset", &reboot_offset) < 0) { + pr_err("failed to find reboot-offset property\n"); + return -EINVAL; + } + + err = register_restart_handler(&hisi_restart_nb); + if (err) + dev_err(&pdev->dev, "cannot register restart handler (err=%d)\n", + err); + + return err; +} + +static const struct of_device_id hisi_reboot_of_match[] = { + { .compatible = "hisilicon,sysctrl" }, + {} +}; + +static struct platform_driver hisi_reboot_driver = { + .probe = hisi_reboot_probe, + .driver = { + .name = "hisi-reboot", + .of_match_table = hisi_reboot_of_match, + }, +}; +module_platform_driver(hisi_reboot_driver); diff --git a/kernel/drivers/power/reset/imx-snvs-poweroff.c b/kernel/drivers/power/reset/imx-snvs-poweroff.c new file mode 100644 index 000000000..ad6ce5020 --- /dev/null +++ b/kernel/drivers/power/reset/imx-snvs-poweroff.c @@ -0,0 +1,66 @@ +/* Power off driver for i.mx6 + * Copyright (c) 2014, FREESCALE CORPORATION. All rights reserved. + * + * based on msm-poweroff.c + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * 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. + * + */ + +#include <linux/err.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> + +static void __iomem *snvs_base; + +static void do_imx_poweroff(void) +{ + u32 value = readl(snvs_base); + + /* set TOP and DP_EN bit */ + writel(value | 0x60, snvs_base); +} + +static int imx_poweroff_probe(struct platform_device *pdev) +{ + snvs_base = of_iomap(pdev->dev.of_node, 0); + if (!snvs_base) { + dev_err(&pdev->dev, "failed to get memory\n"); + return -ENODEV; + } + + pm_power_off = do_imx_poweroff; + return 0; +} + +static const struct of_device_id of_imx_poweroff_match[] = { + { .compatible = "fsl,sec-v4.0-poweroff", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_imx_poweroff_match); + +static struct platform_driver imx_poweroff_driver = { + .probe = imx_poweroff_probe, + .driver = { + .name = "imx-snvs-poweroff", + .of_match_table = of_match_ptr(of_imx_poweroff_match), + }, +}; + +static int __init imx_poweroff_init(void) +{ + return platform_driver_register(&imx_poweroff_driver); +} +device_initcall(imx_poweroff_init); diff --git a/kernel/drivers/power/reset/keystone-reset.c b/kernel/drivers/power/reset/keystone-reset.c new file mode 100644 index 000000000..c70f1bffe --- /dev/null +++ b/kernel/drivers/power/reset/keystone-reset.c @@ -0,0 +1,175 @@ +/* + * TI keystone reboot driver + * + * Copyright (C) 2014 Texas Instruments Incorporated. http://www.ti.com/ + * + * Author: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/io.h> +#include <linux/module.h> +#include <linux/notifier.h> +#include <linux/reboot.h> +#include <linux/regmap.h> +#include <linux/mfd/syscon.h> +#include <linux/of_platform.h> + +#define RSTYPE_RG 0x0 +#define RSCTRL_RG 0x4 +#define RSCFG_RG 0x8 +#define RSISO_RG 0xc + +#define RSCTRL_KEY_MASK 0x0000ffff +#define RSCTRL_RESET_MASK BIT(16) +#define RSCTRL_KEY 0x5a69 + +#define RSMUX_OMODE_MASK 0xe +#define RSMUX_OMODE_RESET_ON 0xa +#define RSMUX_OMODE_RESET_OFF 0x0 +#define RSMUX_LOCK_MASK 0x1 +#define RSMUX_LOCK_SET 0x1 + +#define RSCFG_RSTYPE_SOFT 0x300f +#define RSCFG_RSTYPE_HARD 0x0 + +#define WDT_MUX_NUMBER 0x4 + +static int rspll_offset; +static struct regmap *pllctrl_regs; + +/** + * rsctrl_enable_rspll_write - enable access to RSCTRL, RSCFG + * To be able to access to RSCTRL, RSCFG registers + * we have to write a key before + */ +static inline int rsctrl_enable_rspll_write(void) +{ + return regmap_update_bits(pllctrl_regs, rspll_offset + RSCTRL_RG, + RSCTRL_KEY_MASK, RSCTRL_KEY); +} + +static int rsctrl_restart_handler(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + /* enable write access to RSTCTRL */ + rsctrl_enable_rspll_write(); + + /* reset the SOC */ + regmap_update_bits(pllctrl_regs, rspll_offset + RSCTRL_RG, + RSCTRL_RESET_MASK, 0); + + return NOTIFY_DONE; +} + +static struct notifier_block rsctrl_restart_nb = { + .notifier_call = rsctrl_restart_handler, + .priority = 128, +}; + +static const struct of_device_id rsctrl_of_match[] = { + {.compatible = "ti,keystone-reset", }, + {}, +}; + +static int rsctrl_probe(struct platform_device *pdev) +{ + int i; + int ret; + u32 val; + unsigned int rg; + u32 rsmux_offset; + struct regmap *devctrl_regs; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + + if (!np) + return -ENODEV; + + /* get regmaps */ + pllctrl_regs = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pll"); + if (IS_ERR(pllctrl_regs)) + return PTR_ERR(pllctrl_regs); + + devctrl_regs = syscon_regmap_lookup_by_phandle(np, "ti,syscon-dev"); + if (IS_ERR(devctrl_regs)) + return PTR_ERR(devctrl_regs); + + ret = of_property_read_u32_index(np, "ti,syscon-pll", 1, &rspll_offset); + if (ret) { + dev_err(dev, "couldn't read the reset pll offset!\n"); + return -EINVAL; + } + + ret = of_property_read_u32_index(np, "ti,syscon-dev", 1, &rsmux_offset); + if (ret) { + dev_err(dev, "couldn't read the rsmux offset!\n"); + return -EINVAL; + } + + /* set soft/hard reset */ + val = of_property_read_bool(np, "ti,soft-reset"); + val = val ? RSCFG_RSTYPE_SOFT : RSCFG_RSTYPE_HARD; + + ret = rsctrl_enable_rspll_write(); + if (ret) + return ret; + + ret = regmap_write(pllctrl_regs, rspll_offset + RSCFG_RG, val); + if (ret) + return ret; + + /* disable a reset isolation for all module clocks */ + ret = regmap_write(pllctrl_regs, rspll_offset + RSISO_RG, 0); + if (ret) + return ret; + + /* enable a reset for watchdogs from wdt-list */ + for (i = 0; i < WDT_MUX_NUMBER; i++) { + ret = of_property_read_u32_index(np, "ti,wdt-list", i, &val); + if (ret == -EOVERFLOW && !i) { + dev_err(dev, "ti,wdt-list property has to contain at" + "least one entry\n"); + return -EINVAL; + } else if (ret) { + break; + } + + if (val >= WDT_MUX_NUMBER) { + dev_err(dev, "ti,wdt-list property can contain" + "only numbers < 4\n"); + return -EINVAL; + } + + rg = rsmux_offset + val * 4; + + ret = regmap_update_bits(devctrl_regs, rg, RSMUX_OMODE_MASK, + RSMUX_OMODE_RESET_ON | + RSMUX_LOCK_SET); + if (ret) + return ret; + } + + ret = register_restart_handler(&rsctrl_restart_nb); + if (ret) + dev_err(dev, "cannot register restart handler (err=%d)\n", ret); + + return ret; +} + +static struct platform_driver rsctrl_driver = { + .probe = rsctrl_probe, + .driver = { + .name = KBUILD_MODNAME, + .of_match_table = rsctrl_of_match, + }, +}; +module_platform_driver(rsctrl_driver); + +MODULE_AUTHOR("Ivan Khoronzhuk <ivan.khoronzhuk@ti.com>"); +MODULE_DESCRIPTION("Texas Instruments keystone reset driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" KBUILD_MODNAME); diff --git a/kernel/drivers/power/reset/ltc2952-poweroff.c b/kernel/drivers/power/reset/ltc2952-poweroff.c new file mode 100644 index 000000000..1e0819555 --- /dev/null +++ b/kernel/drivers/power/reset/ltc2952-poweroff.c @@ -0,0 +1,325 @@ +/* + * LTC2952 (PowerPath) driver + * + * Copyright (C) 2014, Xsens Technologies BV <info@xsens.com> + * Maintainer: René Moll <linux@r-moll.nl> + * + * 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. + * + * ---------------------------------------- + * - Description + * ---------------------------------------- + * + * This driver is to be used with an external PowerPath Controller (LTC2952). + * Its function is to determine when a external shut down is triggered + * and react by properly shutting down the system. + * + * This driver expects a device tree with a ltc2952 entry for pin mapping. + * + * ---------------------------------------- + * - GPIO + * ---------------------------------------- + * + * The following GPIOs are used: + * - trigger (input) + * A level change indicates the shut-down trigger. If it's state reverts + * within the time-out defined by trigger_delay, the shut down is not + * executed. If no pin is assigned to this input, the driver will start the + * watchdog toggle immediately. The chip will only power off the system if + * it is requested to do so through the kill line. + * + * - watchdog (output) + * Once a shut down is triggered, the driver will toggle this signal, + * with an internal (wde_interval) to stall the hardware shut down. + * + * - kill (output) + * The last action during shut down is triggering this signalling, such + * that the PowerPath Control will power down the hardware. + * + * ---------------------------------------- + * - Interrupts + * ---------------------------------------- + * + * The driver requires a non-shared, edge-triggered interrupt on the trigger + * GPIO. + * + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/ktime.h> +#include <linux/slab.h> +#include <linux/kmod.h> +#include <linux/module.h> +#include <linux/gpio/consumer.h> +#include <linux/reboot.h> + +struct ltc2952_poweroff { + struct hrtimer timer_trigger; + struct hrtimer timer_wde; + + ktime_t trigger_delay; + ktime_t wde_interval; + + struct device *dev; + + struct gpio_desc *gpio_trigger; + struct gpio_desc *gpio_watchdog; + struct gpio_desc *gpio_kill; + + bool kernel_panic; + struct notifier_block panic_notifier; +}; + +#define to_ltc2952(p, m) container_of(p, struct ltc2952_poweroff, m) + +/* + * This global variable is only needed for pm_power_off. We should + * remove it entirely once we don't need the global state anymore. + */ +static struct ltc2952_poweroff *ltc2952_data; + +/** + * ltc2952_poweroff_timer_wde - Timer callback + * Toggles the watchdog reset signal each wde_interval + * + * @timer: corresponding timer + * + * Returns HRTIMER_RESTART for an infinite loop which will only stop when the + * machine actually shuts down + */ +static enum hrtimer_restart ltc2952_poweroff_timer_wde(struct hrtimer *timer) +{ + ktime_t now; + int state; + unsigned long overruns; + struct ltc2952_poweroff *data = to_ltc2952(timer, timer_wde); + + if (data->kernel_panic) + return HRTIMER_NORESTART; + + state = gpiod_get_value(data->gpio_watchdog); + gpiod_set_value(data->gpio_watchdog, !state); + + now = hrtimer_cb_get_time(timer); + overruns = hrtimer_forward(timer, now, data->wde_interval); + + return HRTIMER_RESTART; +} + +static void ltc2952_poweroff_start_wde(struct ltc2952_poweroff *data) +{ + hrtimer_start(&data->timer_wde, data->wde_interval, HRTIMER_MODE_REL); +} + +static enum hrtimer_restart +ltc2952_poweroff_timer_trigger(struct hrtimer *timer) +{ + struct ltc2952_poweroff *data = to_ltc2952(timer, timer_trigger); + + ltc2952_poweroff_start_wde(data); + dev_info(data->dev, "executing shutdown\n"); + orderly_poweroff(true); + + return HRTIMER_NORESTART; +} + +/** + * ltc2952_poweroff_handler - Interrupt handler + * Triggered each time the trigger signal changes state and (de)activates a + * time-out (timer_trigger). Once the time-out is actually reached the shut + * down is executed. + * + * @irq: IRQ number + * @dev_id: pointer to the main data structure + */ +static irqreturn_t ltc2952_poweroff_handler(int irq, void *dev_id) +{ + struct ltc2952_poweroff *data = dev_id; + + if (data->kernel_panic || hrtimer_active(&data->timer_wde)) { + /* shutdown is already triggered, nothing to do any more */ + return IRQ_HANDLED; + } + + if (gpiod_get_value(data->gpio_trigger)) { + hrtimer_start(&data->timer_trigger, data->trigger_delay, + HRTIMER_MODE_REL); + } else { + hrtimer_cancel(&data->timer_trigger); + /* omitting return value check, timer should have been valid */ + } + return IRQ_HANDLED; +} + +static void ltc2952_poweroff_kill(void) +{ + gpiod_set_value(ltc2952_data->gpio_kill, 1); +} + +static void ltc2952_poweroff_default(struct ltc2952_poweroff *data) +{ + data->wde_interval = ktime_set(0, 300L*1E6L); + data->trigger_delay = ktime_set(2, 500L*1E6L); + + hrtimer_init(&data->timer_trigger, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + data->timer_trigger.function = ltc2952_poweroff_timer_trigger; + + hrtimer_init(&data->timer_wde, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + data->timer_wde.function = ltc2952_poweroff_timer_wde; +} + +static int ltc2952_poweroff_init(struct platform_device *pdev) +{ + int ret; + struct ltc2952_poweroff *data = platform_get_drvdata(pdev); + + ltc2952_poweroff_default(data); + + data->gpio_watchdog = devm_gpiod_get(&pdev->dev, "watchdog", + GPIOD_OUT_LOW); + if (IS_ERR(data->gpio_watchdog)) { + ret = PTR_ERR(data->gpio_watchdog); + dev_err(&pdev->dev, "unable to claim gpio \"watchdog\"\n"); + return ret; + } + + data->gpio_kill = devm_gpiod_get(&pdev->dev, "kill", GPIOD_OUT_LOW); + if (IS_ERR(data->gpio_kill)) { + ret = PTR_ERR(data->gpio_kill); + dev_err(&pdev->dev, "unable to claim gpio \"kill\"\n"); + return ret; + } + + data->gpio_trigger = devm_gpiod_get(&pdev->dev, "trigger", GPIOD_IN); + if (IS_ERR(data->gpio_trigger)) { + /* + * It's not a problem if the trigger gpio isn't available, but + * it is worth a warning if its use was defined in the device + * tree. + */ + if (PTR_ERR(data->gpio_trigger) != -ENOENT) + dev_err(&pdev->dev, + "unable to claim gpio \"trigger\"\n"); + data->gpio_trigger = NULL; + } + + if (devm_request_irq(&pdev->dev, gpiod_to_irq(data->gpio_trigger), + ltc2952_poweroff_handler, + (IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING), + "ltc2952-poweroff", + data)) { + /* + * Some things may have happened: + * - No trigger input was defined + * - Claiming the GPIO failed + * - We could not map to an IRQ + * - We couldn't register an interrupt handler + * + * None of these really are problems, but all of them + * disqualify the push button from controlling the power. + * + * It is therefore important to note that if the ltc2952 + * detects a button press for long enough, it will still start + * its own powerdown window and cut the power on us if we don't + * start the watchdog trigger. + */ + if (data->gpio_trigger) { + dev_warn(&pdev->dev, + "unable to configure the trigger interrupt\n"); + devm_gpiod_put(&pdev->dev, data->gpio_trigger); + data->gpio_trigger = NULL; + } + dev_info(&pdev->dev, + "power down trigger input will not be used\n"); + ltc2952_poweroff_start_wde(data); + } + + return 0; +} + +static int ltc2952_poweroff_notify_panic(struct notifier_block *nb, + unsigned long code, void *unused) +{ + struct ltc2952_poweroff *data = to_ltc2952(nb, panic_notifier); + + data->kernel_panic = true; + return NOTIFY_DONE; +} + +static int ltc2952_poweroff_probe(struct platform_device *pdev) +{ + int ret; + struct ltc2952_poweroff *data; + + if (pm_power_off) { + dev_err(&pdev->dev, "pm_power_off already registered"); + return -EBUSY; + } + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->dev = &pdev->dev; + platform_set_drvdata(pdev, data); + + ret = ltc2952_poweroff_init(pdev); + if (ret) + return ret; + + /* TODO: remove ltc2952_data */ + ltc2952_data = data; + pm_power_off = ltc2952_poweroff_kill; + + data->panic_notifier.notifier_call = ltc2952_poweroff_notify_panic; + atomic_notifier_chain_register(&panic_notifier_list, + &data->panic_notifier); + dev_info(&pdev->dev, "probe successful\n"); + + return 0; +} + +static int ltc2952_poweroff_remove(struct platform_device *pdev) +{ + struct ltc2952_poweroff *data = platform_get_drvdata(pdev); + + pm_power_off = NULL; + hrtimer_cancel(&data->timer_trigger); + hrtimer_cancel(&data->timer_wde); + atomic_notifier_chain_unregister(&panic_notifier_list, + &data->panic_notifier); + return 0; +} + +static const struct of_device_id of_ltc2952_poweroff_match[] = { + { .compatible = "lltc,ltc2952"}, + {}, +}; +MODULE_DEVICE_TABLE(of, of_ltc2952_poweroff_match); + +static struct platform_driver ltc2952_poweroff_driver = { + .probe = ltc2952_poweroff_probe, + .remove = ltc2952_poweroff_remove, + .driver = { + .name = "ltc2952-poweroff", + .of_match_table = of_ltc2952_poweroff_match, + }, +}; + +module_platform_driver(ltc2952_poweroff_driver); + +MODULE_AUTHOR("René Moll <rene.moll@xsens.com>"); +MODULE_DESCRIPTION("LTC PowerPath power-off driver"); +MODULE_LICENSE("GPL v2"); diff --git a/kernel/drivers/power/reset/msm-poweroff.c b/kernel/drivers/power/reset/msm-poweroff.c new file mode 100644 index 000000000..4702efdfe --- /dev/null +++ b/kernel/drivers/power/reset/msm-poweroff.c @@ -0,0 +1,81 @@ +/* Copyright (c) 2013, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * 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. + * + */ + +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/reboot.h> +#include <linux/pm.h> + +static void __iomem *msm_ps_hold; +static int do_msm_restart(struct notifier_block *nb, unsigned long action, + void *data) +{ + writel(0, msm_ps_hold); + mdelay(10000); + + return NOTIFY_DONE; +} + +static struct notifier_block restart_nb = { + .notifier_call = do_msm_restart, + .priority = 128, +}; + +static void do_msm_poweroff(void) +{ + /* TODO: Add poweroff capability */ + do_msm_restart(&restart_nb, 0, NULL); +} + +static int msm_restart_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct resource *mem; + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + msm_ps_hold = devm_ioremap_resource(dev, mem); + if (IS_ERR(msm_ps_hold)) + return PTR_ERR(msm_ps_hold); + + register_restart_handler(&restart_nb); + + pm_power_off = do_msm_poweroff; + + return 0; +} + +static const struct of_device_id of_msm_restart_match[] = { + { .compatible = "qcom,pshold", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_msm_restart_match); + +static struct platform_driver msm_restart_driver = { + .probe = msm_restart_probe, + .driver = { + .name = "msm-restart", + .of_match_table = of_match_ptr(of_msm_restart_match), + }, +}; + +static int __init msm_restart_init(void) +{ + return platform_driver_register(&msm_restart_driver); +} +device_initcall(msm_restart_init); diff --git a/kernel/drivers/power/reset/qnap-poweroff.c b/kernel/drivers/power/reset/qnap-poweroff.c new file mode 100644 index 000000000..2789a61ce --- /dev/null +++ b/kernel/drivers/power/reset/qnap-poweroff.c @@ -0,0 +1,140 @@ +/* + * QNAP Turbo NAS Board power off. Can also be used on Synology devices. + * + * Copyright (C) 2012 Andrew Lunn <andrew@lunn.ch> + * + * Based on the code from: + * + * Copyright (C) 2009 Martin Michlmayr <tbm@cyrius.com> + * Copyright (C) 2008 Byron Bradley <byron.bbradley@gmail.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. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/serial_reg.h> +#include <linux/kallsyms.h> +#include <linux/of.h> +#include <linux/io.h> +#include <linux/clk.h> + +#define UART1_REG(x) (base + ((UART_##x) << 2)) + +struct power_off_cfg { + u32 baud; + char cmd; +}; + +static const struct power_off_cfg qnap_power_off_cfg = { + .baud = 19200, + .cmd = 'A', +}; + +static const struct power_off_cfg synology_power_off_cfg = { + .baud = 9600, + .cmd = '1', +}; + +static const struct of_device_id qnap_power_off_of_match_table[] = { + { .compatible = "qnap,power-off", + .data = &qnap_power_off_cfg, + }, + { .compatible = "synology,power-off", + .data = &synology_power_off_cfg, + }, + {} +}; +MODULE_DEVICE_TABLE(of, qnap_power_off_of_match_table); + +static void __iomem *base; +static unsigned long tclk; +static const struct power_off_cfg *cfg; + +static void qnap_power_off(void) +{ + const unsigned divisor = ((tclk + (8 * cfg->baud)) / (16 * cfg->baud)); + + pr_err("%s: triggering power-off...\n", __func__); + + /* hijack UART1 and reset into sane state */ + writel(0x83, UART1_REG(LCR)); + writel(divisor & 0xff, UART1_REG(DLL)); + writel((divisor >> 8) & 0xff, UART1_REG(DLM)); + writel(0x03, UART1_REG(LCR)); + writel(0x00, UART1_REG(IER)); + writel(0x00, UART1_REG(FCR)); + writel(0x00, UART1_REG(MCR)); + + /* send the power-off command to PIC */ + writel(cfg->cmd, UART1_REG(TX)); +} + +static int qnap_power_off_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct resource *res; + struct clk *clk; + char symname[KSYM_NAME_LEN]; + + const struct of_device_id *match = + of_match_node(qnap_power_off_of_match_table, np); + cfg = match->data; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "Missing resource"); + return -EINVAL; + } + + base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); + if (!base) { + dev_err(&pdev->dev, "Unable to map resource"); + return -EINVAL; + } + + /* We need to know tclk in order to calculate the UART divisor */ + clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "Clk missing"); + return PTR_ERR(clk); + } + + tclk = clk_get_rate(clk); + + /* Check that nothing else has already setup a handler */ + if (pm_power_off) { + lookup_symbol_name((ulong)pm_power_off, symname); + dev_err(&pdev->dev, + "pm_power_off already claimed %p %s", + pm_power_off, symname); + return -EBUSY; + } + pm_power_off = qnap_power_off; + + return 0; +} + +static int qnap_power_off_remove(struct platform_device *pdev) +{ + pm_power_off = NULL; + return 0; +} + +static struct platform_driver qnap_power_off_driver = { + .probe = qnap_power_off_probe, + .remove = qnap_power_off_remove, + .driver = { + .name = "qnap_power_off", + .of_match_table = of_match_ptr(qnap_power_off_of_match_table), + }, +}; +module_platform_driver(qnap_power_off_driver); + +MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>"); +MODULE_DESCRIPTION("QNAP Power off driver"); +MODULE_LICENSE("GPL v2"); diff --git a/kernel/drivers/power/reset/restart-poweroff.c b/kernel/drivers/power/reset/restart-poweroff.c new file mode 100644 index 000000000..41b22c4d5 --- /dev/null +++ b/kernel/drivers/power/reset/restart-poweroff.c @@ -0,0 +1,65 @@ +/* + * Power off by restarting and let u-boot keep hold of the machine + * until the user presses a button for example. + * + * Andrew Lunn <andrew@lunn.ch> + * + * Copyright (C) 2012 Andrew Lunn + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/of_platform.h> +#include <linux/module.h> +#include <linux/reboot.h> + +static void restart_poweroff_do_poweroff(void) +{ + reboot_mode = REBOOT_HARD; + machine_restart(NULL); +} + +static int restart_poweroff_probe(struct platform_device *pdev) +{ + /* If a pm_power_off function has already been added, leave it alone */ + if (pm_power_off != NULL) { + dev_err(&pdev->dev, + "pm_power_off function already registered"); + return -EBUSY; + } + + pm_power_off = &restart_poweroff_do_poweroff; + return 0; +} + +static int restart_poweroff_remove(struct platform_device *pdev) +{ + if (pm_power_off == &restart_poweroff_do_poweroff) + pm_power_off = NULL; + + return 0; +} + +static const struct of_device_id of_restart_poweroff_match[] = { + { .compatible = "restart-poweroff", }, + {}, +}; + +static struct platform_driver restart_poweroff_driver = { + .probe = restart_poweroff_probe, + .remove = restart_poweroff_remove, + .driver = { + .name = "poweroff-restart", + .of_match_table = of_restart_poweroff_match, + }, +}; +module_platform_driver(restart_poweroff_driver); + +MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch"); +MODULE_DESCRIPTION("restart poweroff driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:poweroff-restart"); diff --git a/kernel/drivers/power/reset/rmobile-reset.c b/kernel/drivers/power/reset/rmobile-reset.c new file mode 100644 index 000000000..e6569df76 --- /dev/null +++ b/kernel/drivers/power/reset/rmobile-reset.c @@ -0,0 +1,91 @@ +/* + * Renesas R-Mobile Reset Driver + * + * Copyright (C) 2014 Glider bvba + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/io.h> +#include <linux/module.h> +#include <linux/notifier.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/printk.h> +#include <linux/reboot.h> + +/* SYSC Register Bank 2 */ +#define RESCNT2 0x20 /* Reset Control Register 2 */ + +/* Reset Control Register 2 */ +#define RESCNT2_PRES 0x80000000 /* Soft power-on reset */ + +static void __iomem *sysc_base2; + +static int rmobile_reset_handler(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + pr_debug("%s %lu\n", __func__, mode); + + /* Let's assume we have acquired the HPB semaphore */ + writel(RESCNT2_PRES, sysc_base2 + RESCNT2); + + return NOTIFY_DONE; +} + +static struct notifier_block rmobile_reset_nb = { + .notifier_call = rmobile_reset_handler, + .priority = 192, +}; + +static int rmobile_reset_probe(struct platform_device *pdev) +{ + int error; + + sysc_base2 = of_iomap(pdev->dev.of_node, 1); + if (!sysc_base2) + return -ENODEV; + + error = register_restart_handler(&rmobile_reset_nb); + if (error) { + dev_err(&pdev->dev, + "cannot register restart handler (err=%d)\n", error); + goto fail_unmap; + } + + return 0; + +fail_unmap: + iounmap(sysc_base2); + return error; +} + +static int rmobile_reset_remove(struct platform_device *pdev) +{ + unregister_restart_handler(&rmobile_reset_nb); + iounmap(sysc_base2); + return 0; +} + +static const struct of_device_id rmobile_reset_of_match[] = { + { .compatible = "renesas,sysc-rmobile", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, rmobile_reset_of_match); + +static struct platform_driver rmobile_reset_driver = { + .probe = rmobile_reset_probe, + .remove = rmobile_reset_remove, + .driver = { + .name = "rmobile_reset", + .of_match_table = rmobile_reset_of_match, + }, +}; + +module_platform_driver(rmobile_reset_driver); + +MODULE_DESCRIPTION("Renesas R-Mobile Reset Driver"); +MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>"); +MODULE_LICENSE("GPL v2"); diff --git a/kernel/drivers/power/reset/st-poweroff.c b/kernel/drivers/power/reset/st-poweroff.c new file mode 100644 index 000000000..a488877a3 --- /dev/null +++ b/kernel/drivers/power/reset/st-poweroff.c @@ -0,0 +1,156 @@ +/* + * Copyright (C) 2014 STMicroelectronics + * + * Power off Restart driver, used in STMicroelectronics devices. + * + * Author: Christophe Kerello <christophe.kerello@st.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2, as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/mfd/syscon.h> +#include <linux/reboot.h> +#include <linux/regmap.h> + +struct reset_syscfg { + struct regmap *regmap; + /* syscfg used for reset */ + unsigned int offset_rst; + unsigned int mask_rst; + /* syscfg used for unmask the reset */ + unsigned int offset_rst_msk; + unsigned int mask_rst_msk; +}; + +/* STiH415 */ +#define STIH415_SYSCFG_11 0x2c +#define STIH415_SYSCFG_15 0x3c + +static struct reset_syscfg stih415_reset = { + .offset_rst = STIH415_SYSCFG_11, + .mask_rst = BIT(0), + .offset_rst_msk = STIH415_SYSCFG_15, + .mask_rst_msk = BIT(0) +}; + +/* STiH416 */ +#define STIH416_SYSCFG_500 0x7d0 +#define STIH416_SYSCFG_504 0x7e0 + +static struct reset_syscfg stih416_reset = { + .offset_rst = STIH416_SYSCFG_500, + .mask_rst = BIT(0), + .offset_rst_msk = STIH416_SYSCFG_504, + .mask_rst_msk = BIT(0) +}; + +/* STiH407 */ +#define STIH407_SYSCFG_4000 0x0 +#define STIH407_SYSCFG_4008 0x20 + +static struct reset_syscfg stih407_reset = { + .offset_rst = STIH407_SYSCFG_4000, + .mask_rst = BIT(0), + .offset_rst_msk = STIH407_SYSCFG_4008, + .mask_rst_msk = BIT(0) +}; + +/* STiD127 */ +#define STID127_SYSCFG_700 0x0 +#define STID127_SYSCFG_773 0x124 + +static struct reset_syscfg stid127_reset = { + .offset_rst = STID127_SYSCFG_773, + .mask_rst = BIT(0), + .offset_rst_msk = STID127_SYSCFG_700, + .mask_rst_msk = BIT(8) +}; + +static struct reset_syscfg *st_restart_syscfg; + +static int st_restart(struct notifier_block *this, unsigned long mode, + void *cmd) +{ + /* reset syscfg updated */ + regmap_update_bits(st_restart_syscfg->regmap, + st_restart_syscfg->offset_rst, + st_restart_syscfg->mask_rst, + 0); + + /* unmask the reset */ + regmap_update_bits(st_restart_syscfg->regmap, + st_restart_syscfg->offset_rst_msk, + st_restart_syscfg->mask_rst_msk, + 0); + + return NOTIFY_DONE; +} + +static struct notifier_block st_restart_nb = { + .notifier_call = st_restart, + .priority = 192, +}; + +static const struct of_device_id st_reset_of_match[] = { + { + .compatible = "st,stih415-restart", + .data = (void *)&stih415_reset, + }, { + .compatible = "st,stih416-restart", + .data = (void *)&stih416_reset, + }, { + .compatible = "st,stih407-restart", + .data = (void *)&stih407_reset, + }, { + .compatible = "st,stid127-restart", + .data = (void *)&stid127_reset, + }, + {} +}; + +static int st_reset_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + const struct of_device_id *match; + struct device *dev = &pdev->dev; + + match = of_match_device(st_reset_of_match, dev); + if (!match) + return -ENODEV; + + st_restart_syscfg = (struct reset_syscfg *)match->data; + + st_restart_syscfg->regmap = + syscon_regmap_lookup_by_phandle(np, "st,syscfg"); + if (IS_ERR(st_restart_syscfg->regmap)) { + dev_err(dev, "No syscfg phandle specified\n"); + return PTR_ERR(st_restart_syscfg->regmap); + } + + return register_restart_handler(&st_restart_nb); +} + +static struct platform_driver st_reset_driver = { + .probe = st_reset_probe, + .driver = { + .name = "st_reset", + .of_match_table = st_reset_of_match, + }, +}; + +static int __init st_reset_init(void) +{ + return platform_driver_register(&st_reset_driver); +} + +device_initcall(st_reset_init); + +MODULE_AUTHOR("Christophe Kerello <christophe.kerello@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics Power off Restart driver"); +MODULE_LICENSE("GPL v2"); diff --git a/kernel/drivers/power/reset/syscon-poweroff.c b/kernel/drivers/power/reset/syscon-poweroff.c new file mode 100644 index 000000000..5560b0dbc --- /dev/null +++ b/kernel/drivers/power/reset/syscon-poweroff.c @@ -0,0 +1,102 @@ +/* + * Generic Syscon Poweroff Driver + * + * Copyright (c) 2015, National Instruments Corp. + * Author: Moritz Fischer <moritz.fischer@ettus.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. + */ + +#include <linux/kallsyms.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/notifier.h> +#include <linux/mfd/syscon.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/regmap.h> + +static struct regmap *map; +static u32 offset; +static u32 mask; + +void syscon_poweroff(void) +{ + /* Issue the poweroff */ + regmap_write(map, offset, mask); + + mdelay(1000); + + pr_emerg("Unable to poweroff system\n"); +} + +static int syscon_poweroff_probe(struct platform_device *pdev) +{ + char symname[KSYM_NAME_LEN]; + + map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "regmap"); + if (IS_ERR(map)) { + dev_err(&pdev->dev, "unable to get syscon"); + return PTR_ERR(map); + } + + if (of_property_read_u32(pdev->dev.of_node, "offset", &offset)) { + dev_err(&pdev->dev, "unable to read 'offset'"); + return -EINVAL; + } + + if (of_property_read_u32(pdev->dev.of_node, "mask", &mask)) { + dev_err(&pdev->dev, "unable to read 'mask'"); + return -EINVAL; + } + + if (pm_power_off) { + lookup_symbol_name((ulong)pm_power_off, symname); + dev_err(&pdev->dev, + "pm_power_off already claimed %p %s", + pm_power_off, symname); + return -EBUSY; + } + + pm_power_off = syscon_poweroff; + + return 0; +} + +static int syscon_poweroff_remove(struct platform_device *pdev) +{ + if (pm_power_off == syscon_poweroff) + pm_power_off = NULL; + + return 0; +} + +static const struct of_device_id syscon_poweroff_of_match[] = { + { .compatible = "syscon-poweroff" }, + {} +}; + +static struct platform_driver syscon_poweroff_driver = { + .probe = syscon_poweroff_probe, + .remove = syscon_poweroff_remove, + .driver = { + .name = "syscon-poweroff", + .of_match_table = syscon_poweroff_of_match, + }, +}; + +static int __init syscon_poweroff_register(void) +{ + return platform_driver_register(&syscon_poweroff_driver); +} +device_initcall(syscon_poweroff_register); diff --git a/kernel/drivers/power/reset/syscon-reboot.c b/kernel/drivers/power/reset/syscon-reboot.c new file mode 100644 index 000000000..d3c7d245a --- /dev/null +++ b/kernel/drivers/power/reset/syscon-reboot.c @@ -0,0 +1,91 @@ +/* + * Generic Syscon Reboot Driver + * + * Copyright (c) 2013, Applied Micro Circuits Corporation + * Author: Feng Kan <fkan@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. + */ +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/notifier.h> +#include <linux/mfd/syscon.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/reboot.h> +#include <linux/regmap.h> + +struct syscon_reboot_context { + struct regmap *map; + u32 offset; + u32 mask; + struct notifier_block restart_handler; +}; + +static int syscon_restart_handle(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + struct syscon_reboot_context *ctx = + container_of(this, struct syscon_reboot_context, + restart_handler); + + /* Issue the reboot */ + regmap_write(ctx->map, ctx->offset, ctx->mask); + + mdelay(1000); + + pr_emerg("Unable to restart system\n"); + return NOTIFY_DONE; +} + +static int syscon_reboot_probe(struct platform_device *pdev) +{ + struct syscon_reboot_context *ctx; + struct device *dev = &pdev->dev; + int err; + + ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->map = syscon_regmap_lookup_by_phandle(dev->of_node, "regmap"); + if (IS_ERR(ctx->map)) + return PTR_ERR(ctx->map); + + if (of_property_read_u32(pdev->dev.of_node, "offset", &ctx->offset)) + return -EINVAL; + + if (of_property_read_u32(pdev->dev.of_node, "mask", &ctx->mask)) + return -EINVAL; + + ctx->restart_handler.notifier_call = syscon_restart_handle; + ctx->restart_handler.priority = 192; + err = register_restart_handler(&ctx->restart_handler); + if (err) + dev_err(dev, "can't register restart notifier (err=%d)\n", err); + + return err; +} + +static const struct of_device_id syscon_reboot_of_match[] = { + { .compatible = "syscon-reboot" }, + {} +}; + +static struct platform_driver syscon_reboot_driver = { + .probe = syscon_reboot_probe, + .driver = { + .name = "syscon-reboot", + .of_match_table = syscon_reboot_of_match, + }, +}; +module_platform_driver(syscon_reboot_driver); diff --git a/kernel/drivers/power/reset/vexpress-poweroff.c b/kernel/drivers/power/reset/vexpress-poweroff.c new file mode 100644 index 000000000..6a9bf7089 --- /dev/null +++ b/kernel/drivers/power/reset/vexpress-poweroff.c @@ -0,0 +1,156 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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. + * + * Copyright (C) 2012 ARM Limited + */ + +#include <linux/delay.h> +#include <linux/notifier.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/reboot.h> +#include <linux/stat.h> +#include <linux/vexpress.h> + +static void vexpress_reset_do(struct device *dev, const char *what) +{ + int err = -ENOENT; + struct regmap *reg = dev_get_drvdata(dev); + + if (reg) { + err = regmap_write(reg, 0, 0); + if (!err) + mdelay(1000); + } + + dev_emerg(dev, "Unable to %s (%d)\n", what, err); +} + +static struct device *vexpress_power_off_device; + +static void vexpress_power_off(void) +{ + vexpress_reset_do(vexpress_power_off_device, "power off"); +} + +static struct device *vexpress_restart_device; + +static int vexpress_restart(struct notifier_block *this, unsigned long mode, + void *cmd) +{ + vexpress_reset_do(vexpress_restart_device, "restart"); + + return NOTIFY_DONE; +} + +static struct notifier_block vexpress_restart_nb = { + .notifier_call = vexpress_restart, + .priority = 128, +}; + +static ssize_t vexpress_reset_active_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", vexpress_restart_device == dev); +} + +static ssize_t vexpress_reset_active_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + long value; + int err = kstrtol(buf, 0, &value); + + if (!err && value) + vexpress_restart_device = dev; + + return err ? err : count; +} + +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 }; + +static const struct of_device_id vexpress_reset_of_match[] = { + { + .compatible = "arm,vexpress-reset", + .data = (void *)FUNC_RESET, + }, { + .compatible = "arm,vexpress-shutdown", + .data = (void *)FUNC_SHUTDOWN + }, { + .compatible = "arm,vexpress-reboot", + .data = (void *)FUNC_REBOOT + }, + {} +}; + +static int _vexpress_register_restart_handler(struct device *dev) +{ + int err; + + vexpress_restart_device = dev; + err = register_restart_handler(&vexpress_restart_nb); + if (err) { + dev_err(dev, "cannot register restart handler (err=%d)\n", err); + return err; + } + device_create_file(dev, &dev_attr_active); + + return 0; +} + +static int vexpress_reset_probe(struct platform_device *pdev) +{ + const struct of_device_id *match = + of_match_device(vexpress_reset_of_match, &pdev->dev); + struct regmap *regmap; + int ret = 0; + + if (!match) + return -EINVAL; + + regmap = devm_regmap_init_vexpress_config(&pdev->dev); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + dev_set_drvdata(&pdev->dev, regmap); + + switch ((enum vexpress_reset_func)match->data) { + case FUNC_SHUTDOWN: + vexpress_power_off_device = &pdev->dev; + pm_power_off = vexpress_power_off; + break; + case FUNC_RESET: + if (!vexpress_restart_device) + ret = _vexpress_register_restart_handler(&pdev->dev); + break; + case FUNC_REBOOT: + ret = _vexpress_register_restart_handler(&pdev->dev); + break; + }; + + return ret; +} + +static struct platform_driver vexpress_reset_driver = { + .probe = vexpress_reset_probe, + .driver = { + .name = "vexpress-reset", + .of_match_table = vexpress_reset_of_match, + }, +}; + +static int __init vexpress_reset_init(void) +{ + return platform_driver_register(&vexpress_reset_driver); +} +device_initcall(vexpress_reset_init); diff --git a/kernel/drivers/power/reset/xgene-reboot.c b/kernel/drivers/power/reset/xgene-reboot.c new file mode 100644 index 000000000..f07e93c97 --- /dev/null +++ b/kernel/drivers/power/reset/xgene-reboot.c @@ -0,0 +1,107 @@ +/* + * 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/delay.h> +#include <linux/io.h> +#include <linux/notifier.h> +#include <linux/of_device.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/reboot.h> +#include <linux/stat.h> +#include <linux/slab.h> + +struct xgene_reboot_context { + struct device *dev; + void *csr; + u32 mask; + struct notifier_block restart_handler; +}; + +static int xgene_restart_handler(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + struct xgene_reboot_context *ctx = + container_of(this, struct xgene_reboot_context, + restart_handler); + + /* Issue the reboot */ + writel(ctx->mask, ctx->csr); + + mdelay(1000); + + dev_emerg(ctx->dev, "Unable to restart system\n"); + + return NOTIFY_DONE; +} + +static int xgene_reboot_probe(struct platform_device *pdev) +{ + struct xgene_reboot_context *ctx; + struct device *dev = &pdev->dev; + int err; + + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->csr = of_iomap(dev->of_node, 0); + if (!ctx->csr) { + dev_err(dev, "can not map resource\n"); + return -ENODEV; + } + + if (of_property_read_u32(dev->of_node, "mask", &ctx->mask)) + ctx->mask = 0xFFFFFFFF; + + ctx->dev = dev; + ctx->restart_handler.notifier_call = xgene_restart_handler; + ctx->restart_handler.priority = 128; + err = register_restart_handler(&ctx->restart_handler); + if (err) + dev_err(dev, "cannot register restart handler (err=%d)\n", err); + + return err; +} + +static const 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); |