diff options
Diffstat (limited to 'drivers/power/reset')
| -rw-r--r-- | drivers/power/reset/Kconfig | 33 | ||||
| -rw-r--r-- | drivers/power/reset/Makefile | 2 | ||||
| -rw-r--r-- | drivers/power/reset/at91-poweroff.c | 156 | ||||
| -rw-r--r-- | drivers/power/reset/at91-reset.c | 252 |
4 files changed, 435 insertions, 8 deletions
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index ca41523..c1c046d 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -6,15 +6,33 @@ menuconfig POWER_RESET 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 && POWER_RESET + 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 MACH_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 MACH_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 POWER_RESET && ARCH_AXXIA + depends on ARCH_AXXIA help This driver supports restart for Axxia SoC. @@ -33,7 +51,7 @@ config POWER_RESET_BRCMSTB config POWER_RESET_GPIO bool "GPIO power-off driver" - depends on OF_GPIO && POWER_RESET + 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 @@ -47,13 +65,13 @@ config POWER_RESET_HISI config POWER_RESET_MSM bool "Qualcomm MSM power-off driver" - depends on POWER_RESET && ARCH_QCOM + depends on ARCH_QCOM help Power off and restart support for Qualcomm boards. config POWER_RESET_QNAP bool "QNAP power-off driver" - depends on OF_GPIO && POWER_RESET && PLAT_ORION + 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. @@ -71,14 +89,13 @@ config POWER_RESET_RESTART config POWER_RESET_SUN6I bool "Allwinner A31 SoC reset driver" depends on ARCH_SUNXI - depends on POWER_RESET help Reboot support for the Allwinner A31 SoCs. config POWER_RESET_VEXPRESS bool "ARM Versatile Express power-off and reset driver" depends on ARM || ARM64 - depends on POWER_RESET && VEXPRESS_CONFIG + depends on VEXPRESS_CONFIG help Power off and reset support for the ARM Ltd. Versatile Express boards. @@ -86,7 +103,6 @@ config POWER_RESET_VEXPRESS config POWER_RESET_XGENE bool "APM SoC X-Gene reset driver" depends on ARM64 - depends on POWER_RESET help Reboot support for the APM SoC X-Gene Eval boards. @@ -97,3 +113,4 @@ config POWER_RESET_KEYSTONE help Reboot support for the KEYSTONE SoCs. +endif diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index a42e70e..4433a75 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -1,4 +1,6 @@ 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 diff --git a/drivers/power/reset/at91-poweroff.c b/drivers/power/reset/at91-poweroff.c new file mode 100644 index 0000000..40bf42d --- /dev/null +++ b/drivers/power/reset/at91-poweroff.c @@ -0,0 +1,156 @@ +/* + * 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); + 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); +} + +const enum wakeup_type at91_poweroff_get_wakeup_mode(struct device_node *np) +{ + const char *pm; + int err, i; + + 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; + enum wakeup_type 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 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/drivers/power/reset/at91-reset.c b/drivers/power/reset/at91-reset.c new file mode 100644 index 0000000..3611806 --- /dev/null +++ b/drivers/power/reset/at91-reset.c @@ -0,0 +1,252 @@ +/* + * 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 <asm/system_misc.h> + +#include <mach/at91sam9_ddrsdr.h> +#include <mach/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 void at91sam9260_restart(enum reboot_mode mode, const char *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" (AT91_SDRAMC_LPCB_POWER_DOWN), + "r" (AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST)); +} + +static void at91sam9g45_restart(enum reboot_mode mode, const char *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_RTR) "]\n\t" + /* Disable SDRAM1 accesses */ + " strne %3, [%1, #" __stringify(AT91_DDRSDRC_RTR) "]\n\t" + /* Power down SDRAM1 */ + " strne %4, [%1, #" __stringify(AT91_DDRSDRC_RTR) "]\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" (AT91_DDRSDRC_LPCB_POWER_DOWN), + "r" (AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST) + : "r0"); +} + +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 struct of_device_id at91_ramc_of_match[] = { + { .compatible = "atmel,at91sam9260-sdramc", }, + { .compatible = "atmel,at91sam9g45-ddramc", }, + { .compatible = "atmel,sama5d3-ddramc", }, + { /* sentinel */ } +}; + +static struct of_device_id at91_reset_of_match[] = { + { .compatible = "atmel,at91sam9260-rstc", .data = at91sam9260_restart }, + { .compatible = "atmel,at91sam9g45-rstc", .data = at91sam9g45_restart }, + { /* sentinel */ } +}; + +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); + arm_pm_restart = match->data; + + return 0; +} + +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 (IS_ERR(at91_ramc_base[idx])) { + dev_err(&pdev->dev, "Could not map ram controller address\n"); + return PTR_ERR(at91_ramc_base[idx]); + } + } + + match = platform_get_device_id(pdev); + arm_pm_restart = (void (*)(enum reboot_mode, const char*)) + match->driver_data; + + return 0; +} + +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); |