| Message ID | 20210120162745.61268-6-arnd@kernel.org (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | watchdog: remove obsolete drivers | expand |
On Wed, Jan 20, 2021 at 05:27:45PM +0100, Arnd Bergmann wrote: > From: Arnd Bergmann <arnd@arndb.de> > > The ST-Ericsson U300 platform is getting removed, so this driver is no > longer needed. > > Cc: Linus Walleij <linus.walleij@linaro.org> > Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Guenter Roeck <linux@roeck-us.net> > --- > .../watchdog/stericsson-coh901327.txt | 19 - > drivers/watchdog/Kconfig | 11 - > drivers/watchdog/Makefile | 1 - > drivers/watchdog/coh901327_wdt.c | 408 ------------------ > 4 files changed, 439 deletions(-) > delete mode 100644 Documentation/devicetree/bindings/watchdog/stericsson-coh901327.txt > delete mode 100644 drivers/watchdog/coh901327_wdt.c > > 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 10efbb351f14..3b73735b0c8b 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 1ff40d6a027f..1685dbc70a15 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)"); > -- > 2.29.2 >
On Wed, Jan 20, 2021 at 5:28 PM Arnd Bergmann <arnd@kernel.org> wrote: > From: Arnd Bergmann <arnd@arndb.de> > > The ST-Ericsson U300 platform is getting removed, so this driver is no > longer needed. > > Cc: Linus Walleij <linus.walleij@linaro.org> > Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Yours, Linus Walleij
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 10efbb351f14..3b73735b0c8b 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 1ff40d6a027f..1685dbc70a15 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)");