diff options
| -rw-r--r-- | Documentation/devicetree/bindings/watchdog/stericsson-coh901327.txt | 19 | ||||
| -rw-r--r-- | drivers/watchdog/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/watchdog/Makefile | 1 | ||||
| -rw-r--r-- | drivers/watchdog/coh901327_wdt.c | 408 |
4 files changed, 0 insertions, 439 deletions
diff --git a/Documentation/devicetree/bindings/watchdog/stericsson-coh901327.txt b/Documentation/devicetree/bindings/watchdog/stericsson-coh901327.txt deleted file mode 100644 index 8ffb88e39e76..000000000000 --- a/Documentation/devicetree/bindings/watchdog/stericsson-coh901327.txt +++ /dev/null @@ -1,19 +0,0 @@ -ST-Ericsson COH 901 327 Watchdog timer - -Required properties: -- compatible: must be "stericsson,coh901327". -- reg: physical base address of the controller and length of memory mapped - region. -- interrupts: the interrupt used for the watchdog timeout warning. - -Optional properties: -- timeout-sec: contains the watchdog timeout in seconds. - -Example: - -watchdog: watchdog@c0012000 { - compatible = "stericsson,coh901327"; - reg = <0xc0012000 0x1000>; - interrupts = <3>; - timeout-sec = <60>; -}; diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index dc191725b4e5..0470dc15c085 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -619,17 +619,6 @@ config SUNXI_WATCHDOG To compile this driver as a module, choose M here: the module will be called sunxi_wdt. -config COH901327_WATCHDOG - bool "ST-Ericsson COH 901 327 watchdog" - depends on ARCH_U300 || (ARM && COMMON_CLK && COMPILE_TEST) - default y if MACH_U300 - select WATCHDOG_CORE - help - Say Y here to include Watchdog timer support for the - watchdog embedded into the ST-Ericsson U300 series platforms. - This watchdog is used to reset the system and thus cannot be - compiled as a module. - config NPCM7XX_WATCHDOG tristate "Nuvoton NPCM750 watchdog" depends on ARCH_NPCM || COMPILE_TEST diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 59ab621720ab..57058b81af73 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -61,7 +61,6 @@ obj-$(CONFIG_K3_RTI_WATCHDOG) += rti_wdt.o obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o obj-$(CONFIG_SUNXI_WATCHDOG) += sunxi_wdt.o obj-$(CONFIG_RN5T618_WATCHDOG) += rn5t618_wdt.o -obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o obj-$(CONFIG_NPCM7XX_WATCHDOG) += npcm_wdt.o obj-$(CONFIG_STMP3XXX_RTC_WATCHDOG) += stmp3xxx_rtc_wdt.o obj-$(CONFIG_TS4800_WATCHDOG) += ts4800_wdt.o diff --git a/drivers/watchdog/coh901327_wdt.c b/drivers/watchdog/coh901327_wdt.c deleted file mode 100644 index 260c50b08483..000000000000 --- a/drivers/watchdog/coh901327_wdt.c +++ /dev/null @@ -1,408 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * coh901327_wdt.c - * - * Copyright (C) 2008-2009 ST-Ericsson AB - * Watchdog driver for the ST-Ericsson AB COH 901 327 IP core - * Author: Linus Walleij <linus.walleij@stericsson.com> - */ -#include <linux/moduleparam.h> -#include <linux/mod_devicetable.h> -#include <linux/types.h> -#include <linux/watchdog.h> -#include <linux/interrupt.h> -#include <linux/pm.h> -#include <linux/platform_device.h> -#include <linux/io.h> -#include <linux/bitops.h> -#include <linux/clk.h> -#include <linux/delay.h> -#include <linux/err.h> - -#define DRV_NAME "WDOG COH 901 327" - -/* - * COH 901 327 register definitions - */ - -/* WDOG_FEED Register 32bit (-/W) */ -#define U300_WDOG_FR 0x00 -#define U300_WDOG_FR_FEED_RESTART_TIMER 0xFEEDU -/* WDOG_TIMEOUT Register 32bit (R/W) */ -#define U300_WDOG_TR 0x04 -#define U300_WDOG_TR_TIMEOUT_MASK 0x7FFFU -/* WDOG_DISABLE1 Register 32bit (-/W) */ -#define U300_WDOG_D1R 0x08 -#define U300_WDOG_D1R_DISABLE1_DISABLE_TIMER 0x2BADU -/* WDOG_DISABLE2 Register 32bit (R/W) */ -#define U300_WDOG_D2R 0x0C -#define U300_WDOG_D2R_DISABLE2_DISABLE_TIMER 0xCAFEU -#define U300_WDOG_D2R_DISABLE_STATUS_DISABLED 0xDABEU -#define U300_WDOG_D2R_DISABLE_STATUS_ENABLED 0x0000U -/* WDOG_STATUS Register 32bit (R/W) */ -#define U300_WDOG_SR 0x10 -#define U300_WDOG_SR_STATUS_TIMED_OUT 0xCFE8U -#define U300_WDOG_SR_STATUS_NORMAL 0x0000U -#define U300_WDOG_SR_RESET_STATUS_RESET 0xE8B4U -/* WDOG_COUNT Register 32bit (R/-) */ -#define U300_WDOG_CR 0x14 -#define U300_WDOG_CR_VALID_IND 0x8000U -#define U300_WDOG_CR_VALID_STABLE 0x0000U -#define U300_WDOG_CR_COUNT_VALUE_MASK 0x7FFFU -/* WDOG_JTAGOVR Register 32bit (R/W) */ -#define U300_WDOG_JOR 0x18 -#define U300_WDOG_JOR_JTAG_MODE_IND 0x0002U -#define U300_WDOG_JOR_JTAG_WATCHDOG_ENABLE 0x0001U -/* WDOG_RESTART Register 32bit (-/W) */ -#define U300_WDOG_RR 0x1C -#define U300_WDOG_RR_RESTART_VALUE_RESUME 0xACEDU -/* WDOG_IRQ_EVENT Register 32bit (R/W) */ -#define U300_WDOG_IER 0x20 -#define U300_WDOG_IER_WILL_BARK_IRQ_EVENT_IND 0x0001U -#define U300_WDOG_IER_WILL_BARK_IRQ_ACK_ENABLE 0x0001U -/* WDOG_IRQ_MASK Register 32bit (R/W) */ -#define U300_WDOG_IMR 0x24 -#define U300_WDOG_IMR_WILL_BARK_IRQ_ENABLE 0x0001U -/* WDOG_IRQ_FORCE Register 32bit (R/W) */ -#define U300_WDOG_IFR 0x28 -#define U300_WDOG_IFR_WILL_BARK_IRQ_FORCE_ENABLE 0x0001U - -/* Default timeout in seconds = 1 minute */ -#define U300_WDOG_DEFAULT_TIMEOUT 60 - -static unsigned int margin; -static int irq; -static void __iomem *virtbase; -static struct device *parent; - -static struct clk *clk; - -/* - * Enabling and disabling functions. - */ -static void coh901327_enable(u16 timeout) -{ - u16 val; - unsigned long freq; - unsigned long delay_ns; - - /* Restart timer if it is disabled */ - val = readw(virtbase + U300_WDOG_D2R); - if (val == U300_WDOG_D2R_DISABLE_STATUS_DISABLED) - writew(U300_WDOG_RR_RESTART_VALUE_RESUME, - virtbase + U300_WDOG_RR); - /* Acknowledge any pending interrupt so it doesn't just fire off */ - writew(U300_WDOG_IER_WILL_BARK_IRQ_ACK_ENABLE, - virtbase + U300_WDOG_IER); - /* - * The interrupt is cleared in the 32 kHz clock domain. - * Wait 3 32 kHz cycles for it to take effect - */ - freq = clk_get_rate(clk); - delay_ns = DIV_ROUND_UP(1000000000, freq); /* Freq to ns and round up */ - delay_ns = 3 * delay_ns; /* Wait 3 cycles */ - ndelay(delay_ns); - /* Enable the watchdog interrupt */ - writew(U300_WDOG_IMR_WILL_BARK_IRQ_ENABLE, virtbase + U300_WDOG_IMR); - /* Activate the watchdog timer */ - writew(timeout, virtbase + U300_WDOG_TR); - /* Start the watchdog timer */ - writew(U300_WDOG_FR_FEED_RESTART_TIMER, virtbase + U300_WDOG_FR); - /* - * Extra read so that this change propagate in the watchdog. - */ - (void) readw(virtbase + U300_WDOG_CR); - val = readw(virtbase + U300_WDOG_D2R); - if (val != U300_WDOG_D2R_DISABLE_STATUS_ENABLED) - dev_err(parent, - "%s(): watchdog not enabled! D2R value %04x\n", - __func__, val); -} - -static void coh901327_disable(void) -{ - u16 val; - - /* Disable the watchdog interrupt if it is active */ - writew(0x0000U, virtbase + U300_WDOG_IMR); - /* If the watchdog is currently enabled, attempt to disable it */ - val = readw(virtbase + U300_WDOG_D2R); - if (val != U300_WDOG_D2R_DISABLE_STATUS_DISABLED) { - writew(U300_WDOG_D1R_DISABLE1_DISABLE_TIMER, - virtbase + U300_WDOG_D1R); - writew(U300_WDOG_D2R_DISABLE2_DISABLE_TIMER, - virtbase + U300_WDOG_D2R); - /* Write this twice (else problems occur) */ - writew(U300_WDOG_D2R_DISABLE2_DISABLE_TIMER, - virtbase + U300_WDOG_D2R); - } - val = readw(virtbase + U300_WDOG_D2R); - if (val != U300_WDOG_D2R_DISABLE_STATUS_DISABLED) - dev_err(parent, - "%s(): watchdog not disabled! D2R value %04x\n", - __func__, val); -} - -static int coh901327_start(struct watchdog_device *wdt_dev) -{ - coh901327_enable(wdt_dev->timeout * 100); - return 0; -} - -static int coh901327_stop(struct watchdog_device *wdt_dev) -{ - coh901327_disable(); - return 0; -} - -static int coh901327_ping(struct watchdog_device *wdd) -{ - /* Feed the watchdog */ - writew(U300_WDOG_FR_FEED_RESTART_TIMER, - virtbase + U300_WDOG_FR); - return 0; -} - -static int coh901327_settimeout(struct watchdog_device *wdt_dev, - unsigned int time) -{ - wdt_dev->timeout = time; - /* Set new timeout value */ - writew(time * 100, virtbase + U300_WDOG_TR); - /* Feed the dog */ - writew(U300_WDOG_FR_FEED_RESTART_TIMER, - virtbase + U300_WDOG_FR); - return 0; -} - -static unsigned int coh901327_gettimeleft(struct watchdog_device *wdt_dev) -{ - u16 val; - - /* Read repeatedly until the value is stable! */ - val = readw(virtbase + U300_WDOG_CR); - while (val & U300_WDOG_CR_VALID_IND) - val = readw(virtbase + U300_WDOG_CR); - val &= U300_WDOG_CR_COUNT_VALUE_MASK; - if (val != 0) - val /= 100; - - return val; -} - -/* - * This interrupt occurs 10 ms before the watchdog WILL bark. - */ -static irqreturn_t coh901327_interrupt(int irq, void *data) -{ - u16 val; - - /* - * Ack IRQ? If this occurs we're FUBAR anyway, so - * just acknowledge, disable the interrupt and await the imminent end. - * If you at some point need a host of callbacks to be called - * when the system is about to watchdog-reset, add them here! - * - * NOTE: on future versions of this IP-block, it will be possible - * to prevent a watchdog reset by feeding the watchdog at this - * point. - */ - val = readw(virtbase + U300_WDOG_IER); - if (val == U300_WDOG_IER_WILL_BARK_IRQ_EVENT_IND) - writew(U300_WDOG_IER_WILL_BARK_IRQ_ACK_ENABLE, - virtbase + U300_WDOG_IER); - writew(0x0000U, virtbase + U300_WDOG_IMR); - dev_crit(parent, "watchdog is barking!\n"); - return IRQ_HANDLED; -} - -static const struct watchdog_info coh901327_ident = { - .options = WDIOF_CARDRESET | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, - .identity = DRV_NAME, -}; - -static const struct watchdog_ops coh901327_ops = { - .owner = THIS_MODULE, - .start = coh901327_start, - .stop = coh901327_stop, - .ping = coh901327_ping, - .set_timeout = coh901327_settimeout, - .get_timeleft = coh901327_gettimeleft, -}; - -static struct watchdog_device coh901327_wdt = { - .info = &coh901327_ident, - .ops = &coh901327_ops, - /* - * Max timeout is 327 since the 10ms - * timeout register is max - * 0x7FFF = 327670ms ~= 327s. - */ - .min_timeout = 1, - .max_timeout = 327, - .timeout = U300_WDOG_DEFAULT_TIMEOUT, -}; - -static int __init coh901327_probe(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - int ret; - u16 val; - - parent = dev; - - virtbase = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(virtbase)) - return PTR_ERR(virtbase); - - clk = clk_get(dev, NULL); - if (IS_ERR(clk)) { - ret = PTR_ERR(clk); - dev_err(dev, "could not get clock\n"); - return ret; - } - ret = clk_prepare_enable(clk); - if (ret) { - dev_err(dev, "could not prepare and enable clock\n"); - goto out_no_clk_enable; - } - - val = readw(virtbase + U300_WDOG_SR); - switch (val) { - case U300_WDOG_SR_STATUS_TIMED_OUT: - dev_info(dev, "watchdog timed out since last chip reset!\n"); - coh901327_wdt.bootstatus |= WDIOF_CARDRESET; - /* Status will be cleared below */ - break; - case U300_WDOG_SR_STATUS_NORMAL: - dev_info(dev, "in normal status, no timeouts have occurred.\n"); - break; - default: - dev_info(dev, "contains an illegal status code (%08x)\n", val); - break; - } - - val = readw(virtbase + U300_WDOG_D2R); - switch (val) { - case U300_WDOG_D2R_DISABLE_STATUS_DISABLED: - dev_info(dev, "currently disabled.\n"); - break; - case U300_WDOG_D2R_DISABLE_STATUS_ENABLED: - dev_info(dev, "currently enabled! (disabling it now)\n"); - coh901327_disable(); - break; - default: - dev_err(dev, "contains an illegal enable/disable code (%08x)\n", - val); - break; - } - - /* Reset the watchdog */ - writew(U300_WDOG_SR_RESET_STATUS_RESET, virtbase + U300_WDOG_SR); - - irq = platform_get_irq(pdev, 0); - if (request_irq(irq, coh901327_interrupt, 0, - DRV_NAME " Bark", pdev)) { - ret = -EIO; - goto out_no_irq; - } - - watchdog_init_timeout(&coh901327_wdt, margin, dev); - - coh901327_wdt.parent = dev; - ret = watchdog_register_device(&coh901327_wdt); - if (ret) - goto out_no_wdog; - - dev_info(dev, "initialized. (timeout=%d sec)\n", - coh901327_wdt.timeout); - return 0; - -out_no_wdog: - free_irq(irq, pdev); -out_no_irq: - clk_disable_unprepare(clk); -out_no_clk_enable: - clk_put(clk); - return ret; -} - -#ifdef CONFIG_PM - -static u16 wdogenablestore; -static u16 irqmaskstore; - -static int coh901327_suspend(struct platform_device *pdev, pm_message_t state) -{ - irqmaskstore = readw(virtbase + U300_WDOG_IMR) & 0x0001U; - wdogenablestore = readw(virtbase + U300_WDOG_D2R); - /* If watchdog is on, disable it here and now */ - if (wdogenablestore == U300_WDOG_D2R_DISABLE_STATUS_ENABLED) - coh901327_disable(); - return 0; -} - -static int coh901327_resume(struct platform_device *pdev) -{ - /* Restore the watchdog interrupt */ - writew(irqmaskstore, virtbase + U300_WDOG_IMR); - if (wdogenablestore == U300_WDOG_D2R_DISABLE_STATUS_ENABLED) { - /* Restart the watchdog timer */ - writew(U300_WDOG_RR_RESTART_VALUE_RESUME, - virtbase + U300_WDOG_RR); - writew(U300_WDOG_FR_FEED_RESTART_TIMER, - virtbase + U300_WDOG_FR); - } - return 0; -} -#else -#define coh901327_suspend NULL -#define coh901327_resume NULL -#endif - -/* - * Mistreating the watchdog is the only way to perform a software reset of the - * system on EMP platforms. So we implement this and export a symbol for it. - */ -void coh901327_watchdog_reset(void) -{ - /* Enable even if on JTAG too */ - writew(U300_WDOG_JOR_JTAG_WATCHDOG_ENABLE, - virtbase + U300_WDOG_JOR); - /* - * Timeout = 5s, we have to wait for the watchdog reset to - * actually take place: the watchdog will be reloaded with the - * default value immediately, so we HAVE to reboot and get back - * into the kernel in 30s, or the device will reboot again! - * The boot loader will typically deactivate the watchdog, so we - * need time enough for the boot loader to get to the point of - * deactivating the watchdog before it is shut down by it. - * - * NOTE: on future versions of the watchdog, this restriction is - * gone: the watchdog will be reloaded with a default value (1 min) - * instead of last value, and you can conveniently set the watchdog - * timeout to 10ms (value = 1) without any problems. - */ - coh901327_enable(500); - /* Return and await doom */ -} - -static const struct of_device_id coh901327_dt_match[] = { - { .compatible = "stericsson,coh901327" }, - {}, -}; - -static struct platform_driver coh901327_driver = { - .driver = { - .name = "coh901327_wdog", - .of_match_table = coh901327_dt_match, - .suppress_bind_attrs = true, - }, - .suspend = coh901327_suspend, - .resume = coh901327_resume, -}; -builtin_platform_driver_probe(coh901327_driver, coh901327_probe); - -/* not really modular, but ... */ -module_param(margin, uint, 0); -MODULE_PARM_DESC(margin, "Watchdog margin in seconds (default 60s)"); |