diff options
| -rw-r--r-- | Documentation/devicetree/bindings/watchdog/marvel.txt | 7 | ||||
| -rw-r--r-- | arch/powerpc/kernel/setup-common.c | 27 | ||||
| -rw-r--r-- | arch/x86/platform/intel-mid/device_libs/Makefile | 1 | ||||
| -rw-r--r-- | arch/x86/platform/intel-mid/device_libs/platform_wdt.c | 72 | ||||
| -rw-r--r-- | drivers/watchdog/Kconfig | 49 | ||||
| -rw-r--r-- | drivers/watchdog/Makefile | 3 | ||||
| -rw-r--r-- | drivers/watchdog/ath79_wdt.c | 16 | ||||
| -rw-r--r-- | drivers/watchdog/booke_wdt.c | 51 | ||||
| -rw-r--r-- | drivers/watchdog/imx2_wdt.c | 320 | ||||
| -rw-r--r-- | drivers/watchdog/intel-mid_wdt.c | 184 | ||||
| -rw-r--r-- | drivers/watchdog/kempld_wdt.c | 2 | ||||
| -rw-r--r-- | drivers/watchdog/of_xilinx_wdt.c | 2 | ||||
| -rw-r--r-- | drivers/watchdog/orion_wdt.c | 213 | ||||
| -rw-r--r-- | drivers/watchdog/shwdt.c | 2 | ||||
| -rw-r--r-- | drivers/watchdog/sp805_wdt.c | 4 | ||||
| -rw-r--r-- | drivers/watchdog/sunxi_wdt.c | 22 | ||||
| -rw-r--r-- | drivers/watchdog/via_wdt.c | 2 | ||||
| -rw-r--r-- | drivers/watchdog/w83627hf_wdt.c | 15 | ||||
| -rw-r--r-- | drivers/watchdog/w83697hf_wdt.c | 460 | ||||
| -rw-r--r-- | drivers/watchdog/w83697ug_wdt.c | 397 | ||||
| -rw-r--r-- | include/linux/platform_data/intel-mid_wdt.h | 22 |
21 files changed, 710 insertions, 1161 deletions
diff --git a/Documentation/devicetree/bindings/watchdog/marvel.txt b/Documentation/devicetree/bindings/watchdog/marvel.txt index de11eb4c121..97223fddb7b 100644 --- a/Documentation/devicetree/bindings/watchdog/marvel.txt +++ b/Documentation/devicetree/bindings/watchdog/marvel.txt @@ -5,11 +5,18 @@ Required Properties: - Compatibility : "marvell,orion-wdt" "marvell,armada-370-wdt" "marvell,armada-xp-wdt" + "marvell,armada-375-wdt" + "marvell,armada-380-wdt" - reg : Should contain two entries: first one with the timer control address, second one with the rstout enable address. +For "marvell,armada-375-wdt" and "marvell,armada-380-wdt": + +- reg : A third entry is mandatory and should contain the + shared mask/unmask RSTOUT address. + Optional properties: - interrupts : Contains the IRQ for watchdog expiration diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c index aa0f5edd857..d4d418376f9 100644 --- a/arch/powerpc/kernel/setup-common.c +++ b/arch/powerpc/kernel/setup-common.c @@ -728,33 +728,6 @@ static int powerpc_debugfs_init(void) arch_initcall(powerpc_debugfs_init); #endif -#ifdef CONFIG_BOOKE_WDT -extern u32 booke_wdt_enabled; -extern u32 booke_wdt_period; - -/* Checks wdt=x and wdt_period=xx command-line option */ -notrace int __init early_parse_wdt(char *p) -{ - if (p && strncmp(p, "0", 1) != 0) - booke_wdt_enabled = 1; - - return 0; -} -early_param("wdt", early_parse_wdt); - -int __init early_parse_wdt_period(char *p) -{ - unsigned long ret; - if (p) { - if (!kstrtol(p, 0, &ret)) - booke_wdt_period = ret; - } - - return 0; -} -early_param("wdt_period", early_parse_wdt_period); -#endif /* CONFIG_BOOKE_WDT */ - void ppc_printk_progress(char *s, unsigned short hex) { pr_info("%s\n", s); diff --git a/arch/x86/platform/intel-mid/device_libs/Makefile b/arch/x86/platform/intel-mid/device_libs/Makefile index 097e7a7940d..af9307f2cc2 100644 --- a/arch/x86/platform/intel-mid/device_libs/Makefile +++ b/arch/x86/platform/intel-mid/device_libs/Makefile @@ -20,3 +20,4 @@ obj-$(subst m,y,$(CONFIG_DRM_MEDFIELD)) += platform_tc35876x.o obj-$(subst m,y,$(CONFIG_SERIAL_MRST_MAX3110)) += platform_max3111.o # MISC Devices obj-$(subst m,y,$(CONFIG_KEYBOARD_GPIO)) += platform_gpio_keys.o +obj-$(subst m,y,$(CONFIG_INTEL_MID_WATCHDOG)) += platform_wdt.o diff --git a/arch/x86/platform/intel-mid/device_libs/platform_wdt.c b/arch/x86/platform/intel-mid/device_libs/platform_wdt.c new file mode 100644 index 00000000000..973cf3bfa9f --- /dev/null +++ b/arch/x86/platform/intel-mid/device_libs/platform_wdt.c @@ -0,0 +1,72 @@ +/* + * platform_wdt.c: Watchdog platform library file + * + * (C) Copyright 2014 Intel Corporation + * Author: David Cohen <david.a.cohen@linux.intel.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; version 2 + * of the License. + */ + +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/platform_data/intel-mid_wdt.h> +#include <asm/intel-mid.h> +#include <asm/io_apic.h> + +#define TANGIER_EXT_TIMER0_MSI 15 + +static struct platform_device wdt_dev = { + .name = "intel_mid_wdt", + .id = -1, +}; + +static int tangier_probe(struct platform_device *pdev) +{ + int ioapic; + int irq; + struct intel_mid_wdt_pdata *pdata = pdev->dev.platform_data; + struct io_apic_irq_attr irq_attr = { 0 }; + + if (!pdata) + return -EINVAL; + + irq = pdata->irq; + ioapic = mp_find_ioapic(irq); + if (ioapic >= 0) { + int ret; + irq_attr.ioapic = ioapic; + irq_attr.ioapic_pin = irq; + irq_attr.trigger = 1; + /* irq_attr.polarity = 0; -> Active high */ + ret = io_apic_set_pci_routing(NULL, irq, &irq_attr); + if (ret) + return ret; + } else { + dev_warn(&pdev->dev, "cannot find interrupt %d in ioapic\n", + irq); + return -EINVAL; + } + + return 0; +} + +static struct intel_mid_wdt_pdata tangier_pdata = { + .irq = TANGIER_EXT_TIMER0_MSI, + .probe = tangier_probe, +}; + +static int __init register_mid_wdt(void) +{ + if (intel_mid_identify_cpu() == INTEL_MID_CPU_CHIP_TANGIER) { + wdt_dev.dev.platform_data = &tangier_pdata; + return platform_device_register(&wdt_dev); + } + + return -ENODEV; +} + +rootfs_initcall(register_mid_wdt); diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 74ec8fc5cc0..c845527b503 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -272,7 +272,7 @@ config PNX4008_WATCHDOG config IOP_WATCHDOG tristate "IOP Watchdog" - depends on PLAT_IOP + depends on ARCH_IOP13XX select WATCHDOG_NOWAYOUT if (ARCH_IOP32X || ARCH_IOP33X) help Say Y here if to include support for the watchdog timer @@ -378,6 +378,8 @@ config MAX63XX_WATCHDOG config IMX2_WDT tristate "IMX2+ Watchdog" depends on ARCH_MXC + select REGMAP_MMIO + select WATCHDOG_CORE help This is the driver for the hardware watchdog on the Freescale IMX2 and later processors. @@ -663,6 +665,19 @@ config INTEL_SCU_WATCHDOG To compile this driver as a module, choose M here. +config INTEL_MID_WATCHDOG + tristate "Intel MID Watchdog Timer" + depends on X86_INTEL_MID + select WATCHDOG_CORE + ---help--- + Watchdog timer driver built into the Intel SCU for Intel MID + Platforms. + + This driver currently supports only the watchdog evolution + implementation in SCU, available for Merrifield generation. + + To compile this driver as a module, choose M here. + config ITCO_WDT tristate "Intel TCO Timer/Watchdog" depends on (X86 || IA64) && PCI @@ -835,7 +850,7 @@ config 60XX_WDT config SBC8360_WDT tristate "SBC8360 Watchdog Timer" - depends on X86 + depends on X86_32 ---help--- This is the driver for the hardware watchdog on the SBC8360 Single @@ -938,36 +953,6 @@ config W83627HF_WDT Most people will say N. -config W83697HF_WDT - tristate "W83697HF/W83697HG Watchdog Timer" - depends on X86 - ---help--- - This is the driver for the hardware watchdog on the W83697HF/HG - chipset as used in Dedibox/VIA motherboards (and likely others). - This watchdog simply watches your kernel to make sure it doesn't - freeze, and if it does, it reboots your computer after a certain - amount of time. - - To compile this driver as a module, choose M here: the - module will be called w83697hf_wdt. - - Most people will say N. - -config W83697UG_WDT - tristate "W83697UG/W83697UF Watchdog Timer" - depends on X86 - ---help--- - This is the driver for the hardware watchdog on the W83697UG/UF - chipset as used in MSI Fuzzy CX700 VIA motherboards (and likely others). - This watchdog simply watches your kernel to make sure it doesn't - freeze, and if it does, it reboots your computer after a certain - amount of time. - - To compile this driver as a module, choose M here: the - module will be called w83697ug_wdt. - - Most people will say N. - config W83877F_WDT tristate "W83877F (EMACS) Watchdog Timer" depends on X86 diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 1b5f3d5efad..7b8a91ed20e 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -107,13 +107,12 @@ obj-$(CONFIG_SMSC_SCH311X_WDT) += sch311x_wdt.o obj-$(CONFIG_SMSC37B787_WDT) += smsc37b787_wdt.o obj-$(CONFIG_VIA_WDT) += via_wdt.o obj-$(CONFIG_W83627HF_WDT) += w83627hf_wdt.o -obj-$(CONFIG_W83697HF_WDT) += w83697hf_wdt.o -obj-$(CONFIG_W83697UG_WDT) += w83697ug_wdt.o obj-$(CONFIG_W83877F_WDT) += w83877f_wdt.o obj-$(CONFIG_W83977F_WDT) += w83977f_wdt.o obj-$(CONFIG_MACHZ_WDT) += machzwd.o obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o obj-$(CONFIG_INTEL_SCU_WATCHDOG) += intel_scu_watchdog.o +obj-$(CONFIG_INTEL_MID_WATCHDOG) += intel-mid_wdt.o # M32R Architecture diff --git a/drivers/watchdog/ath79_wdt.c b/drivers/watchdog/ath79_wdt.c index 399c3fddecf..41ac4660fb8 100644 --- a/drivers/watchdog/ath79_wdt.c +++ b/drivers/watchdog/ath79_wdt.c @@ -20,6 +20,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/bitops.h> +#include <linux/delay.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/io.h> @@ -90,6 +91,15 @@ static inline void ath79_wdt_keepalive(void) static inline void ath79_wdt_enable(void) { ath79_wdt_keepalive(); + + /* + * Updating the TIMER register requires a few microseconds + * on the AR934x SoCs at least. Use a small delay to ensure + * that the TIMER register is updated within the hardware + * before enabling the watchdog. + */ + udelay(2); + ath79_wdt_wr(WDOG_REG_CTRL, WDOG_CTRL_ACTION_FCR); /* flush write */ ath79_wdt_rr(WDOG_REG_CTRL); @@ -255,7 +265,7 @@ static int ath79_wdt_probe(struct platform_device *pdev) if (IS_ERR(wdt_clk)) return PTR_ERR(wdt_clk); - err = clk_enable(wdt_clk); + err = clk_prepare_enable(wdt_clk); if (err) return err; @@ -286,14 +296,14 @@ static int ath79_wdt_probe(struct platform_device *pdev) return 0; err_clk_disable: - clk_disable(wdt_clk); + clk_disable_unprepare(wdt_clk); return err; } static int ath79_wdt_remove(struct platform_device *pdev) { misc_deregister(&ath79_wdt_miscdev); - clk_disable(wdt_clk); + clk_disable_unprepare(wdt_clk); return 0; } diff --git a/drivers/watchdog/booke_wdt.c b/drivers/watchdog/booke_wdt.c index a8dbceb3291..08a785398ea 100644 --- a/drivers/watchdog/booke_wdt.c +++ b/drivers/watchdog/booke_wdt.c @@ -41,6 +41,28 @@ u32 booke_wdt_period = CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT; #define WDTP_MASK (TCR_WP_MASK) #endif +/* Checks wdt=x and wdt_period=xx command-line option */ +notrace int __init early_parse_wdt(char *p) +{ + if (p && strncmp(p, "0", 1) != 0) + booke_wdt_enabled = 1; + + return 0; +} +early_param("wdt", early_parse_wdt); + +int __init early_parse_wdt_period(char *p) +{ + unsigned long ret; + if (p) { + if (!kstrtol(p, 0, &ret)) + booke_wdt_period = ret; + } + + return 0; +} +early_param("wdt_period", early_parse_wdt_period); + #ifdef CONFIG_PPC_FSL_BOOK3E /* For the specified period, determine the number of seconds @@ -103,17 +125,18 @@ static unsigned int sec_to_period(unsigned int secs) static void __booke_wdt_set(void *data) { u32 val; + struct watchdog_device *wdog = data; val = mfspr(SPRN_TCR); val &= ~WDTP_MASK; - val |= WDTP(booke_wdt_period); + val |= WDTP(sec_to_period(wdog->timeout)); mtspr(SPRN_TCR, val); } -static void booke_wdt_set(void) +static void booke_wdt_set(void *data) { - on_each_cpu(__booke_wdt_set, NULL, 0); + on_each_cpu(__booke_wdt_set, data, 0); } static void __booke_wdt_ping(void *data) @@ -131,12 +154,13 @@ static int booke_wdt_ping(struct watchdog_device *wdog) static void __booke_wdt_enable(void *data) { u32 val; + struct watchdog_device *wdog = data; /* clear status before enabling watchdog */ __booke_wdt_ping(NULL); val = mfspr(SPRN_TCR); val &= ~WDTP_MASK; - val |= (TCR_WIE|TCR_WRC(WRC_CHIP)|WDTP(booke_wdt_period)); + val |= (TCR_WIE|TCR_WRC(WRC_CHIP)|WDTP(sec_to_period(wdog->timeout))); mtspr(SPRN_TCR, val); } @@ -162,25 +186,17 @@ static void __booke_wdt_disable(void *data) } -static void __booke_wdt_start(struct watchdog_device *wdog) +static int booke_wdt_start(struct watchdog_device *wdog) { - on_each_cpu(__booke_wdt_enable, NULL, 0); + on_each_cpu(__booke_wdt_enable, wdog, 0); pr_debug("watchdog enabled (timeout = %u sec)\n", wdog->timeout); -} -static int booke_wdt_start(struct watchdog_device *wdog) -{ - if (booke_wdt_enabled == 0) { - booke_wdt_enabled = 1; - __booke_wdt_start(wdog); - } return 0; } static int booke_wdt_stop(struct watchdog_device *wdog) { on_each_cpu(__booke_wdt_disable, NULL, 0); - booke_wdt_enabled = 0; pr_debug("watchdog disabled\n"); return 0; @@ -191,9 +207,8 @@ static int booke_wdt_set_timeout(struct watchdog_device *wdt_dev, { if (timeout > MAX_WDT_TIMEOUT) return -EINVAL; - booke_wdt_period = sec_to_period(timeout); wdt_dev->timeout = timeout; - booke_wdt_set(); + booke_wdt_set(wdt_dev); return 0; } @@ -231,10 +246,10 @@ static int __init booke_wdt_init(void) pr_info("powerpc book-e watchdog driver loaded\n"); booke_wdt_info.firmware_version = cur_cpu_spec->pvr_value; booke_wdt_set_timeout(&booke_wdt_dev, - period_to_sec(CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT)); + period_to_sec(booke_wdt_period)); watchdog_set_nowayout(&booke_wdt_dev, nowayout); if (booke_wdt_enabled) - __booke_wdt_start(&booke_wdt_dev); + booke_wdt_start(&booke_wdt_dev); ret = watchdog_register_device(&booke_wdt_dev); diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c index dd51d9539b3..9d4874f0994 100644 --- a/drivers/watchdog/imx2_wdt.c +++ b/drivers/watchdog/imx2_wdt.c @@ -21,19 +21,17 @@ * Halt on suspend: Manual Can be automatic */ +#include <linux/clk.h> #include <linux/init.h> +#include <linux/io.h> +#include <linux/jiffies.h> #include <linux/kernel.h> -#include <linux/miscdevice.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/platform_device.h> -#include <linux/watchdog.h> -#include <linux/clk.h> -#include <linux/fs.h> -#include <linux/io.h> -#include <linux/uaccess.h> +#include <linux/regmap.h> #include <linux/timer.h> -#include <linux/jiffies.h> +#include <linux/watchdog.h> #define DRIVER_NAME "imx2-wdt" @@ -55,19 +53,12 @@ #define WDOG_SEC_TO_COUNT(s) ((s * 2 - 1) << 8) -#define IMX2_WDT_STATUS_OPEN 0 -#define IMX2_WDT_STATUS_STARTED 1 -#define IMX2_WDT_EXPECT_CLOSE 2 - -static struct { +struct imx2_wdt_device { struct clk *clk; - void __iomem *base; - unsigned timeout; - unsigned long status; + struct regmap *regmap; struct timer_list timer; /* Pings the watchdog when closed */ -} imx2_wdt; - -static struct miscdevice imx2_wdt_miscdev; + struct watchdog_device wdog; +}; static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); @@ -85,9 +76,12 @@ static const struct watchdog_info imx2_wdt_info = { .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, }; -static inline void imx2_wdt_setup(void) +static inline void imx2_wdt_setup(struct watchdog_device *wdog) { - u16 val = __raw_readw(imx2_wdt.base + IMX2_WDT_WCR); + struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog); + u32 val; + + regmap_read(wdev->regmap, IMX2_WDT_WCR, &val); /* Suspend timer in low power mode, write once-only */ val |= IMX2_WDT_WCR_WDZST; @@ -98,227 +92,199 @@ static inline void imx2_wdt_setup(void) /* Keep Watchdog Disabled */ val &= ~IMX2_WDT_WCR_WDE; /* Set the watchdog's Time-Out value */ - val |= WDOG_SEC_TO_COUNT(imx2_wdt.timeout); + val |= WDOG_SEC_TO_COUNT(wdog->timeout); - __raw_writew(val, imx2_wdt.base + IMX2_WDT_WCR); + regmap_write(wdev->regmap, IMX2_WDT_WCR, val); /* enable the watchdog */ val |= IMX2_WDT_WCR_WDE; - __raw_writew(val, imx2_wdt.base + IMX2_WDT_WCR); + regmap_write(wdev->regmap, IMX2_WDT_WCR, val); } -static inline void imx2_wdt_ping(void) +static inline bool imx2_wdt_is_running(struct imx2_wdt_device *wdev) { - __raw_writew(IMX2_WDT_SEQ1, imx2_wdt.base + IMX2_WDT_WSR); - __raw_writew(IMX2_WDT_SEQ2, imx2_wdt.base + IMX2_WDT_WSR); -} + u32 val; -static void imx2_wdt_timer_ping(unsigned long arg) -{ - /* ping it every imx2_wdt.timeout / 2 seconds to prevent reboot */ - imx2_wdt_ping(); - mod_timer(&imx2_wdt.timer, jiffies + imx2_wdt.timeout * HZ / 2); + regmap_read(wdev->regmap, IMX2_WDT_WCR, &val); + + return val & IMX2_WDT_WCR_WDE; } -static void imx2_wdt_start(void) +static int imx2_wdt_ping(struct watchdog_device *wdog) { - if (!test_and_set_bit(IMX2_WDT_STATUS_STARTED, &imx2_wdt.status)) { - /* at our first start we enable clock and do initialisations */ - clk_prepare_enable(imx2_wdt.clk); + struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog); - imx2_wdt_setup(); - } else /* delete the timer that pings the watchdog after close */ - del_timer_sync(&imx2_wdt.timer); - - /* Watchdog is enabled - time to reload the timeout value */ - imx2_wdt_ping(); + regmap_write(wdev->regmap, IMX2_WDT_WSR, IMX2_WDT_SEQ1); + regmap_write(wdev->regmap, IMX2_WDT_WSR, IMX2_WDT_SEQ2); + return 0; } -static void imx2_wdt_stop(void) +static void imx2_wdt_timer_ping(unsigned long arg) { - /* we don't need a clk_disable, it cannot be disabled once started. - * We use a timer to ping the watchdog while /dev/watchdog is closed */ - imx2_wdt_timer_ping(0); + struct watchdog_device *wdog = (struct watchdog_device *)arg; + struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog); + + /* ping it every wdog->timeout / 2 seconds to prevent reboot */ + imx2_wdt_ping(wdog); + mod_timer(&wdev->timer, jiffies + wdog->timeout * HZ / 2); } -static void imx2_wdt_set_timeout(int new_timeout) +static int imx2_wdt_set_timeout(struct watchdog_device *wdog, + unsigned int new_timeout) { - u16 val = __raw_readw(imx2_wdt.base + IMX2_WDT_WCR); + struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog); - /* set the new timeout value in the WSR */ - val &= ~IMX2_WDT_WCR_WT; - val |= WDOG_SEC_TO_COUNT(new_timeout); - __raw_writew(val, imx2_wdt.base + IMX2_WDT_WCR); + regmap_update_bits(wdev->regmap, IMX2_WDT_WCR, IMX2_WDT_WCR_WT, + WDOG_SEC_TO_COUNT(new_timeout)); + return 0; } -static int imx2_wdt_open(struct inode *inode, struct file *file) +static int imx2_wdt_start(struct watchdog_device *wdog) { - if (test_and_set_bit(IMX2_WDT_STATUS_OPEN, &imx2_wdt.status)) - return -EBUSY; + struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog); + + if (imx2_wdt_is_running(wdev)) { + /* delete the timer that pings the watchdog after close */ + del_timer_sync(&wdev->timer); + imx2_wdt_set_timeout(wdog, wdog->timeout); + } else + imx2_wdt_setup(wdog); - imx2_wdt_start(); - return nonseekable_open(inode, file); + return imx2_wdt_ping(wdog); } -static int imx2_wdt_close(struct inode *inode, struct file *file) +static int imx2_wdt_stop(struct watchdog_device *wdog) { - if (test_bit(IMX2_WDT_EXPECT_CLOSE, &imx2_wdt.status) && !nowayout) - imx2_wdt_stop(); - else { - dev_crit(imx2_wdt_miscdev.parent, - "Unexpected close: Expect reboot!\n"); - imx2_wdt_ping(); - } - - clear_bit(IMX2_WDT_EXPECT_CLOSE, &imx2_wdt.status); - clear_bit(IMX2_WDT_STATUS_OPEN, &imx2_wdt.status); + /* + * We don't need a clk_disable, it cannot be disabled once started. + * We use a timer to ping the watchdog while /dev/watchdog is closed + */ + imx2_wdt_timer_ping((unsigned long)wdog); return 0; } -static long imx2_wdt_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) +static inline void imx2_wdt_ping_if_active(struct watchdog_device *wdog) { - void __user *argp = (void __user *)arg; - int __user *p = argp; - int new_value; - u16 val; - - switch (cmd) { - case WDIOC_GETSUPPORT: - return copy_to_user(argp, &imx2_wdt_info, - sizeof(struct watchdog_info)) ? -EFAULT : 0; - - case WDIOC_GETSTATUS: - return put_user(0, p); - - case WDIOC_GETBOOTSTATUS: - val = __raw_readw(imx2_wdt.base + IMX2_WDT_WRSR); - new_value = val & IMX2_WDT_WRSR_TOUT ? WDIOF_CARDRESET : 0; - return put_user(new_value, p); - - case WDIOC_KEEPALIVE: - imx2_wdt_ping(); - return 0; - - case WDIOC_SETTIMEOUT: - if (get_user(new_value, p)) - return -EFAULT; - if ((new_value < 1) || (new_value > IMX2_WDT_MAX_TIME)) - return -EINVAL; - imx2_wdt_set_timeout(new_value); - imx2_wdt.timeout = new_value; - imx2_wdt_ping(); - - /* Fallthrough to return current value */ - case WDIOC_GETTIMEOUT: - return put_user(imx2_wdt.timeout, p); - - default: - return -ENOTTY; - } -} + struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog); -static ssize_t imx2_wdt_write(struct file *file, const char __user *data, - size_t len, loff_t *ppos) -{ - size_t i; - char c; - - if (len == 0) /* Can we see this even ? */ - return 0; - - clear_bit(IMX2_WDT_EXPECT_CLOSE, &imx2_wdt.status); - /* scan to see whether or not we got the magic character */ - for (i = 0; i != len; i++) { - if (get_user(c, data + i)) - return -EFAULT; - if (c == 'V') - set_bit(IMX2_WDT_EXPECT_CLOSE, &imx2_wdt.status); + if (imx2_wdt_is_running(wdev)) { + imx2_wdt_set_timeout(wdog, wdog->timeout); + imx2_wdt_timer_ping((unsigned long)wdog); } - - imx2_wdt_ping(); - return len; } -static const struct file_operations imx2_wdt_fops = { +static struct watchdog_ops imx2_wdt_ops = { .owner = THIS_MODULE, - .llseek = no_llseek, - .unlocked_ioctl = imx2_wdt_ioctl, - .open = imx2_wdt_open, - .release = imx2_wdt_close, - .write = imx2_wdt_write, + .start = imx2_wdt_start, + .stop = imx2_wdt_stop, + .ping = imx2_wdt_ping, + .set_timeout = imx2_wdt_set_timeout, }; -static struct miscdevice imx2_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &imx2_wdt_fops, +static struct regmap_config imx2_wdt_regmap_config = { + .reg_bits = 16, + .reg_stride = 2, + .val_bits = 16, + .max_register = 0x8, }; static int __init imx2_wdt_probe(struct platform_device *pdev) { - int ret; + struct imx2_wdt_device *wdev; + struct watchdog_device *wdog; struct resource *res; + void __iomem *base; + int ret; + u32 val; + + wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL); + if (!wdev) + return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - imx2_wdt.base = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(imx2_wdt.base)) - return PTR_ERR(imx2_wdt.base); + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + wdev->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base, + &imx2_wdt_regmap_config); + if (IS_ERR(wdev->regmap)) { + dev_err(&pdev->dev, "regmap init failed\n"); + return PTR_ERR(wdev->regmap); + } - imx2_wdt.clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(imx2_wdt.clk)) { + wdev->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(wdev->clk)) { dev_err(&pdev->dev, "can't get Watchdog clock\n"); - return PTR_ERR(imx2_wdt.clk); + return PTR_ERR(wdev->clk); } - imx2_wdt.timeout = clamp_t(unsigned, timeout, 1, IMX2_WDT_MAX_TIME); - if (imx2_wdt.timeout != timeout) - dev_warn(&pdev->dev, "Initial timeout out of range! " - "Clamped from %u to %u\n", timeout, imx2_wdt.timeout); + wdog = &wdev->wdog; + wdog->info = &imx2_wdt_info; + wdog->ops = &imx2_wdt_ops; + wdog->min_timeout = 1; + wdog->max_timeout = IMX2_WDT_MAX_TIME; - setup_timer(&imx2_wdt.timer, imx2_wdt_timer_ping, 0); + clk_prepare_enable(wdev->clk); - imx2_wdt_miscdev.parent = &pdev->dev; - ret = misc_register(&imx2_wdt_miscdev); - if (ret) - goto fail; + regmap_read(wdev->regmap, IMX2_WDT_WRSR, &val); + wdog->bootstatus = val & IMX2_WDT_WRSR_TOUT ? WDIOF_CARDRESET : 0; - dev_info(&pdev->dev, - "IMX2+ Watchdog Timer enabled. timeout=%ds (nowayout=%d)\n", - imx2_wdt.timeout, nowayout); - return 0; + wdog->timeout = clamp_t(unsigned, timeout, 1, IMX2_WDT_MAX_TIME); + if (wdog->timeout != timeout) + dev_warn(&pdev->dev, "Initial timeout out of range! Clamped from %u to %u\n", + timeout, wdog->timeout); + + platform_set_drvdata(pdev, wdog); + watchdog_set_drvdata(wdog, wdev); + watchdog_set_nowayout(wdog, nowayout); + watchdog_init_timeout(wdog, timeout, &pdev->dev); + + setup_timer(&wdev->timer, imx2_wdt_timer_ping, (unsigned long)wdog); + + imx2_wdt_ping_if_active(wdog); -fail: - imx2_wdt_miscdev.parent = NULL; - return ret; + ret = watchdog_register_device(wdog); + if (ret) { + dev_err(&pdev->dev, "cannot register watchdog device\n"); + return ret; + } + + dev_info(&pdev->dev, "timeout %d sec (nowayout=%d)\n", + wdog->timeout, nowayout); + + return 0; } static int __exit imx2_wdt_remove(struct platform_device *pdev) { - misc_deregister(&imx2_wdt_miscdev); + struct watchdog_device *wdog = platform_get_drvdata(pdev); + struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog); - if (test_bit(IMX2_WDT_STATUS_STARTED, &imx2_wdt.status)) { - del_timer_sync(&imx2_wdt.timer); + watchdog_unregister_device(wdog); - dev_crit(imx2_wdt_miscdev.parent, - "Device removed: Expect reboot!\n"); + if (imx2_wdt_is_running(wdev)) { + del_timer_sync(&wdev->timer); + imx2_wdt_ping(wdog); + dev_crit(&pdev->dev, "Device removed: Expect reboot!\n"); } - - imx2_wdt_miscdev.parent = NULL; return 0; } static void imx2_wdt_shutdown(struct platform_device *pdev) { - if (test_bit(IMX2_WDT_STATUS_STARTED, &imx2_wdt.status)) { - /* we are running, we need to delete the timer but will give - * max timeout before reboot will take place */ - del_timer_sync(&imx2_wdt.timer); - imx2_wdt_set_timeout(IMX2_WDT_MAX_TIME); - imx2_wdt_ping(); - - dev_crit(imx2_wdt_miscdev.parent, - "Device shutdown: Expect reboot!\n"); + struct watchdog_device *wdog = platform_get_drvdata(pdev); + struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog); + + if (imx2_wdt_is_running(wdev)) { + /* + * We are running, we need to delete the timer but will + * give max timeout before reboot will take place + */ + del_timer_sync(&wdev->timer); + imx2_wdt_set_timeout(wdog, IMX2_WDT_MAX_TIME); + imx2_wdt_ping(wdog); + dev_crit(&pdev->dev, "Device shutdown: Expect reboot!\n"); } } diff --git a/drivers/watchdog/intel-mid_wdt.c b/drivers/watchdog/intel-mid_wdt.c new file mode 100644 index 00000000000..ca66e8e7463 --- /dev/null +++ b/drivers/watchdog/intel-mid_wdt.c @@ -0,0 +1,184 @@ +/* + * intel-mid_wdt: generic Intel MID SCU watchdog driver + * + * Platforms supported so far: + * - Merrifield only + * + * Copyright (C) 2014 Intel Corporation. All rights reserved. + * Contact: David Cohen <david.a.cohen@linux.intel.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General + * Public License as published by the Free Software Foundation. + */ + +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/nmi.h> +#include <linux/platform_device.h> +#include <linux/watchdog.h> +#include <linux/platform_data/intel-mid_wdt.h> + +#include <asm/intel_scu_ipc.h> +#include <asm/intel-mid.h> + +#define IPC_WATCHDOG 0xf8 + +#define MID_WDT_PRETIMEOUT 15 +#define MID_WDT_TIMEOUT_MIN (1 + MID_WDT_PRETIMEOUT) +#define MID_WDT_TIMEOUT_MAX 170 +#define MID_WDT_DEFAULT_TIMEOUT 90 + +/* SCU watchdog messages */ +enum { + SCU_WATCHDOG_START = 0, + SCU_WATCHDOG_STOP, + SCU_WATCHDOG_KEEPALIVE, +}; + +static inline int wdt_command(int sub, u32 *in, int inlen) +{ + return intel_scu_ipc_command(IPC_WATCHDOG, sub, in, inlen, NULL, 0); +} + +static int wdt_start(struct watchdog_device *wd) +{ + int ret, in_size; + int timeout = wd->timeout; + struct ipc_wd_start { + u32 pretimeout; + u32 timeout; + } ipc_wd_start = { timeout - MID_WDT_PRETIMEOUT, timeout }; + + /* + * SCU expects the input size for watchdog IPC to + * be based on 4 bytes + */ + in_size = DIV_ROUND_UP(sizeof(ipc_wd_start), 4); + + ret = wdt_command(SCU_WATCHDOG_START, (u32 *)&ipc_wd_start, in_size); + if (ret) { + struct device *dev = watchdog_get_drvdata(wd); + dev_crit(dev, "error starting watchdog: %d\n", ret); + } + + return ret; +} + +static int wdt_ping(struct watchdog_device *wd) +{ + int ret; + + ret = wdt_command(SCU_WATCHDOG_KEEPALIVE, NULL, 0); + if (ret) { + struct device *dev = watchdog_get_drvdata(wd); + dev_crit(dev, "Error executing keepalive: 0x%x\n", ret); + } + + return ret; +} + +static int wdt_stop(struct watchdog_device *wd) +{ + int ret; + + ret = wdt_command(SCU_WATCHDOG_STOP, NULL, 0); + if (ret) { + struct device *dev = watchdog_get_drvdata(wd); + dev_crit(dev, "Error stopping watchdog: 0x%x\n", ret); + } + + return ret; +} + +static irqreturn_t mid_wdt_irq(int irq, void *dev_id) +{ + panic("Kernel Watchdog"); + + /* This code should not be reached */ + return IRQ_HANDLED; +} + +static const struct watchdog_info mid_wdt_info = { + .identity = "Intel MID SCU watchdog", + .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT, +}; + +static const struct watchdog_ops mid_wdt_ops = { + .owner = THIS_MODULE, + .start = wdt_start, + .stop = wdt_stop, + .ping = wdt_ping, +}; + +static int mid_wdt_probe(struct platform_device *pdev) +{ + struct watchdog_device *wdt_dev; + struct intel_mid_wdt_pdata *pdata = pdev->dev.platform_data; + int ret; + + if (!pdata) { + dev_err(&pdev->dev, "missing platform data\n"); + return -EINVAL; + } + + if (pdata->probe) { + ret = pdata->probe(pdev); + if (ret) + return ret; + } + + wdt_dev = devm_kzalloc(&pdev->dev, sizeof(*wdt_dev), GFP_KERNEL); + if (!wdt_dev) + return -ENOMEM; + + wdt_dev->info = &mid_wdt_info; + wdt_dev->ops = &mid_wdt_ops; + wdt_dev->min_timeout = MID_WDT_TIMEOUT_MIN; + wdt_dev->max_timeout = MID_WDT_TIMEOUT_MAX; + wdt_dev->timeout = MID_WDT_DEFAULT_TIMEOUT; + + watchdog_set_drvdata(wdt_dev, &pdev->dev); + platform_set_drvdata(pdev, wdt_dev); + + ret = devm_request_irq(&pdev->dev, pdata->irq, mid_wdt_irq, + IRQF_SHARED | IRQF_NO_SUSPEND, "watchdog", + wdt_dev); + if (ret) { + dev_err(&pdev->dev, "error requesting warning irq %d\n", + pdata->irq); + return ret; + } + + ret = watchdog_register_device(wdt_dev); + if (ret) { + dev_err(&pdev->dev, "error registering watchdog device\n"); + return ret; + } + + dev_info(&pdev->dev, "Intel MID watchdog device probed\n"); + + return 0; +} + +static int mid_wdt_remove(struct platform_device *pdev) +{ + struct watchdog_device *wd = platform_get_drvdata(pdev); + watchdog_unregister_device(wd); + return 0; +} + +static struct platform_driver mid_wdt_driver = { + .probe = mid_wdt_probe, + .remove = mid_wdt_remove, + .driver = { + .owner = THIS_MODULE, + .name = "intel_mid_wdt", + }, +}; + +module_platform_driver(mid_wdt_driver); + +MODULE_AUTHOR("David Cohen <david.a.cohen@linux.intel.com>"); +MODULE_DESCRIPTION("Watchdog Driver for Intel MID platform"); +MODULE_LICENSE("GPL"); diff --git a/drivers/watchdog/kempld_wdt.c b/drivers/watchdog/kempld_wdt.c index 20dc7384473..d9c1a160192 100644 --- a/drivers/watchdog/kempld_wdt.c +++ b/drivers/watchdog/kempld_wdt.c @@ -162,7 +162,7 @@ static int kempld_wdt_set_stage_timeout(struct kempld_wdt_data *wdt_data, kempld_get_mutex(pld); stage_cfg = kempld_read8(pld, KEMPLD_WDT_STAGE_CFG(stage->id)); stage_cfg &= ~STAGE_CFG_PRESCALER_MASK; - stage_cfg |= STAGE_CFG_SET_PRESCALER(prescaler); + stage_cfg |= STAGE_CFG_SET_PRESCALER(PRESCALER_21); kempld_write8(pld, KEMPLD_WDT_STAGE_CFG(stage->id), stage_cfg); kempld_write32(pld, KEMPLD_WDT_STAGE_TIMEOUT(stage->id), stage_timeout); diff --git a/drivers/watchdog/of_xilinx_wdt.c b/drivers/watchdog/of_xilinx_wdt.c index 57ccae8327f..1e6e28df5d7 100644 --- a/drivers/watchdog/of_xilinx_wdt.c +++ b/drivers/watchdog/of_xilinx_wdt.c @@ -225,7 +225,7 @@ static int xwdt_remove(struct platform_device *pdev) } /* Match table for of_platform binding */ -static struct of_device_id xwdt_of_match[] = { +static const struct of_device_id xwdt_of_match[] = { { .compatible = "xlnx,xps-timebase-wdt-1.00.a", }, { .compatible = "xlnx,xps-timebase-wdt-1.01.a", }, {}, diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c index 9b3c41d1870..00d0741228f 100644 --- a/drivers/watchdog/orion_wdt.c +++ b/drivers/watchdog/orion_wdt.c @@ -55,15 +55,19 @@ struct orion_watchdog_data { int wdt_counter_offset; int wdt_enable_bit; int rstout_enable_bit; + int rstout_mask_bit; int (*clock_init)(struct platform_device *, struct orion_watchdog *); + int (*enabled)(struct orion_watchdog *); int (*start)(struct watchdog_device *); + int (*stop)(struct watchdog_device *); }; struct orion_watchdog { struct watchdog_device wdt; void __iomem *reg; void __iomem *rstout; + void __iomem *rstout_mask; unsigned long clk_rate; struct clk *clk; const struct orion_watchdog_data *data; @@ -142,9 +146,35 @@ static int orion_wdt_ping(struct watchdog_device *wdt_dev) return 0; } +static int armada375_start(struct watchdog_device *wdt_dev) +{ + struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev); + u32 reg; + + /* Set watchdog duration */ + writel(dev->clk_rate * wdt_dev->timeout, + dev->reg + dev->data->wdt_counter_offset); + + /* Clear the watchdog expiration bit */ + atomic_io_modify(dev->reg + TIMER_A370_STATUS, WDT_A370_EXPIRED, 0); + + /* Enable watchdog timer */ + atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit, + dev->data->wdt_enable_bit); + + /* Enable reset on watchdog */ + reg = readl(dev->rstout); + reg |= dev->data->rstout_enable_bit; + writel(reg, dev->rstout); + + atomic_io_modify(dev->rstout_mask, dev->data->rstout_mask_bit, 0); + return 0; +} + static int armada370_start(struct watchdog_device *wdt_dev) { struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev); + u32 reg; /* Set watchdog duration */ writel(dev->clk_rate * wdt_dev->timeout, @@ -157,8 +187,10 @@ static int armada370_start(struct watchdog_device *wdt_dev) atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit, dev->data->wdt_enable_bit); - atomic_io_modify(dev->rstout, dev->data->rstout_enable_bit, - dev->data->rstout_enable_bit); + /* Enable reset on watchdog */ + reg = readl(dev->rstout); + reg |= dev->data->rstout_enable_bit; + writel(reg, dev->rstout); return 0; } @@ -189,7 +221,7 @@ static int orion_wdt_start(struct watchdog_device *wdt_dev) return dev->data->start(wdt_dev); } -static int orion_wdt_stop(struct watchdog_device *wdt_dev) +static int orion_stop(struct watchdog_device *wdt_dev) { struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev); @@ -202,7 +234,48 @@ static int orion_wdt_stop(struct watchdog_device *wdt_dev) return 0; } -static int orion_wdt_enabled(struct orion_watchdog *dev) +static int armada375_stop(struct watchdog_device *wdt_dev) +{ + struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev); + u32 reg; + + /* Disable reset on watchdog */ + atomic_io_modify(dev->rstout_mask, dev->data->rstout_mask_bit, + dev->data->rstout_mask_bit); + reg = readl(dev->rstout); + reg &= ~dev->data->rstout_enable_bit; + writel(reg, dev->rstout); + + /* Disable watchdog timer */ + atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit, 0); + + return 0; +} + +static int armada370_stop(struct watchdog_device *wdt_dev) +{ + struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev); + u32 reg; + + /* Disable reset on watchdog */ + reg = readl(dev->rstout); + reg &= ~dev->data->rstout_enable_bit; + writel(reg, dev->rstout); + + /* Disable watchdog timer */ + atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit, 0); + + return 0; +} + +static int orion_wdt_stop(struct watchdog_device *wdt_dev) +{ + struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev); + + return dev->data->stop(wdt_dev); +} + +static int orion_enabled(struct orion_watchdog *dev) { bool enabled, running; @@ -212,6 +285,24 @@ static int orion_wdt_enabled(struct orion_watchdog *dev) return enabled && running; } +static int armada375_enabled(struct orion_watchdog *dev) +{ + bool masked, enabled, running; + + masked = readl(dev->rstout_mask) & dev->data->rstout_mask_bit; + enabled = readl(dev->rstout) & dev->data->rstout_enable_bit; + running = readl(dev->reg + TIMER_CTRL) & dev->data->wdt_enable_bit; + + return !masked && enabled && running; +} + +static int orion_wdt_enabled(struct watchdog_device *wdt_dev) +{ + struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev); + + return dev->data->enabled(dev); +} + static unsigned int orion_wdt_get_timeleft(struct watchdog_device *wdt_dev) { struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev); @@ -262,10 +353,6 @@ static void __iomem *orion_wdt_ioremap_rstout(struct platform_device *pdev, return devm_ioremap(&pdev->dev, res->start, resource_size(res)); - /* This workaround works only for "orion-wdt", DT-enabled */ - if (!of_device_is_compatible(pdev->dev.of_node, "marvell,orion-wdt")) - return NULL; - rstout = internal_regs + ORION_RSTOUT_MASK_OFFSET; WARN(1, FW_BUG "falling back to harcoded RSTOUT reg %pa\n", &rstout); @@ -277,7 +364,9 @@ static const struct orion_watchdog_data orion_data = { .wdt_enable_bit = BIT(4), .wdt_counter_offset = 0x24, .clock_init = orion_wdt_clock_init, + .enabled = orion_enabled, .start = orion_start, + .stop = orion_stop, }; static const struct orion_watchdog_data armada370_data = { @@ -285,7 +374,9 @@ static const struct orion_watchdog_data armada370_data = { .wdt_enable_bit = BIT(8), .wdt_counter_offset = 0x34, .clock_init = armada370_wdt_clock_init, + .enabled = orion_enabled, .start = armada370_start, + .stop = armada370_stop, }; static const struct orion_watchdog_data armadaxp_data = { @@ -293,7 +384,31 @@ static const struct orion_watchdog_data armadaxp_data = { .wdt_enable_bit = BIT(8), .wdt_counter_offset = 0x34, .clock_init = armadaxp_wdt_clock_init, + .enabled = orion_enabled, .start = armada370_start, + .stop = armada370_stop, +}; + +static const struct orion_watchdog_data armada375_data = { + .rstout_enable_bit = BIT(8), + .rstout_mask_bit = BIT(10), + .wdt_enable_bit = BIT(8), + .wdt_counter_offset = 0x34, + .clock_init = armada370_wdt_clock_init, + .enabled = armada375_enabled, + .start = armada375_start, + .stop = armada375_stop, +}; + +static const struct orion_watchdog_data armada380_data = { + .rstout_enable_bit = BIT(8), + .rstout_mask_bit = BIT(10), + .wdt_enable_bit = BIT(8), + .wdt_counter_offset = 0x34, + .clock_init = armadaxp_wdt_clock_init, + .enabled = armada375_enabled, + .start = armada375_start, + .stop = armada375_stop, }; static const struct of_device_id orion_wdt_of_match_table[] = { @@ -309,16 +424,78 @@ static const struct of_device_id orion_wdt_of_match_table[] = { .compatible = "marvell,armada-xp-wdt", .data = &armadaxp_data, }, + { + .compatible = "marvell,armada-375-wdt", + .data = &armada375_data, + }, + { + .compatible = "marvell,armada-380-wdt", + .data = &armada380_data, + }, {}, }; MODULE_DEVICE_TABLE(of, orion_wdt_of_match_table); +static int orion_wdt_get_regs(struct platform_device *pdev, + struct orion_watchdog *dev) +{ + struct device_node *node = pdev->dev.of_node; + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + dev->reg = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!dev->reg) + return -ENOMEM; + + /* Each supported compatible has some RSTOUT register quirk */ + if (of_device_is_compatible(node, "marvell,orion-wdt")) { + + dev->rstout = orion_wdt_ioremap_rstout(pdev, res->start & + INTERNAL_REGS_MASK); + if (!dev->rstout) + return -ENODEV; + + } else if (of_device_is_compatible(node, "marvell,armada-370-wdt") || + of_device_is_compatible(node, "marvell,armada-xp-wdt")) { + + /* Dedicated RSTOUT register, can be requested. */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + dev->rstout = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(dev->rstout)) + return PTR_ERR(dev->rstout); + + } else if (of_device_is_compatible(node, "marvell,armada-375-wdt") || + of_device_is_compatible(node, "marvell,armada-380-wdt")) { + + /* Dedicated RSTOUT register, can be requested. */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + dev->rstout = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(dev->rstout)) + return PTR_ERR(dev->rstout); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 2); + if (!res) + return -ENODEV; + dev->rstout_mask = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!dev->rstout_mask) + return -ENOMEM; + + } else { + return -ENODEV; + } + + return 0; +} + static int orion_wdt_probe(struct platform_device *pdev) { struct orion_watchdog *dev; const struct of_device_id *match; unsigned int wdt_max_duration; /* (seconds) */ - struct resource *res; int ret, irq; dev = devm_kzalloc(&pdev->dev, sizeof(struct orion_watchdog), @@ -336,19 +513,9 @@ static int orion_wdt_probe(struct platform_device *pdev) dev->wdt.min_timeout = 1; dev->data = match->data; - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) - return -ENODEV; - - dev->reg = devm_ioremap(&pdev->dev, res->start, - resource_size(res)); - if (!dev->reg) - return -ENOMEM; - - dev->rstout = orion_wdt_ioremap_rstout(pdev, res->start & - INTERNAL_REGS_MASK); - if (!dev->rstout) - return -ENODEV; + ret = orion_wdt_get_regs(pdev, dev); + if (ret) + return ret; ret = dev->data->clock_init(pdev, dev); if (ret) { @@ -371,7 +538,7 @@ static int orion_wdt_probe(struct platform_device *pdev) * removed and re-insterted, or if the bootloader explicitly * set a running watchdog before booting the kernel. */ - if (!orion_wdt_enabled(dev)) + if (!orion_wdt_enabled(&dev->wdt)) orion_wdt_stop(&dev->wdt); /* Request the IRQ only after the watchdog is disabled */ diff --git a/drivers/watchdog/shwdt.c b/drivers/watchdog/shwdt.c index d04d02b41c3..061756e36cf 100644 --- a/drivers/watchdog/shwdt.c +++ b/drivers/watchdog/shwdt.c @@ -282,8 +282,6 @@ static int sh_wdt_probe(struct platform_device *pdev) wdt->timer.data = (unsigned long)wdt; wdt->timer.expires = next_ping_period(clock_division_ratio); - platform_set_drvdata(pdev, wdt); - dev_info(&pdev->dev, "initialized.\n"); pm_runtime_enable(&pdev->dev); diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c index 47629d268e0..c1b03f4235b 100644 --- a/drivers/watchdog/sp805_wdt.c +++ b/drivers/watchdog/sp805_wdt.c @@ -59,7 +59,6 @@ * @adev: amba device structure of wdt * @status: current status of wdt * @load_val: load value to be set for current timeout - * @timeout: current programmed timeout */ struct sp805_wdt { struct watchdog_device wdd; @@ -68,7 +67,6 @@ struct sp805_wdt { struct clk *clk; struct amba_device *adev; unsigned int load_val; - unsigned int timeout; }; static bool nowayout = WATCHDOG_NOWAYOUT; @@ -98,7 +96,7 @@ static int wdt_setload(struct watchdog_device *wdd, unsigned int timeout) spin_lock(&wdt->lock); wdt->load_val = load; /* roundup timeout to closest positive integer value */ - wdt->timeout = div_u64((load + 1) * 2 + (rate / 2), rate); + wdd->timeout = div_u64((load + 1) * 2 + (rate / 2), rate); spin_unlock(&wdt->lock); return 0; diff --git a/drivers/watchdog/sunxi_wdt.c b/drivers/watchdog/sunxi_wdt.c index cd00a7836cd..693b9d2c6e3 100644 --- a/drivers/watchdog/sunxi_wdt.c +++ b/drivers/watchdog/sunxi_wdt.c @@ -57,17 +57,17 @@ struct sunxi_wdt_dev { */ static const int wdt_timeout_map[] = { - [1] = 0b0001, /* 1s */ - [2] = 0b0010, /* 2s */ - [3] = 0b0011, /* 3s */ - [4] = 0b0100, /* 4s */ - [5] = 0b0101, /* 5s */ - [6] = 0b0110, /* 6s */ - [8] = 0b0111, /* 8s */ - [10] = 0b1000, /* 10s */ - [12] = 0b1001, /* 12s */ - [14] = 0b1010, /* 14s */ - [16] = 0b1011, /* 16s */ + [1] = 0x1, /* 1s */ + [2] = 0x2, /* 2s */ + [3] = 0x3, /* 3s */ + [4] = 0x4, /* 4s */ + [5] = 0x5, /* 5s */ + [6] = 0x6, /* 6s */ + [8] = 0x7, /* 8s */ + [10] = 0x8, /* 10s */ + [12] = 0x9, /* 12s */ + [14] = 0xA, /* 14s */ + [16] = 0xB, /* 16s */ }; static int sunxi_wdt_ping(struct watchdog_device *wdt_dev) diff --git a/drivers/watchdog/via_wdt.c b/drivers/watchdog/via_wdt.c index d2cd9f0bcb9..56369c4f196 100644 --- a/drivers/watchdog/via_wdt.c +++ b/drivers/watchdog/via_wdt.c @@ -232,7 +232,7 @@ err_out_disable_device: static void wdt_remove(struct pci_dev *pdev) { watchdog_unregister_device(&wdt_dev); - del_timer(&timer); + del_timer_sync(&timer); iounmap(wdt_mem); release_mem_region(mmio, VIA_WDT_MMIO_LEN); release_resource(&wdt_res); diff --git a/drivers/watchdog/w83627hf_wdt.c b/drivers/watchdog/w83627hf_wdt.c index b1da0c18fd1..7165704a3e3 100644 --- a/drivers/watchdog/w83627hf_wdt.c +++ b/drivers/watchdog/w83627hf_wdt.c @@ -64,6 +64,10 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); +static int early_disable; +module_param(early_disable, int, 0); +MODULE_PARM_DESC(early_disable, "Disable watchdog at boot time (default=0)"); + /* * Kernel methods. */ @@ -208,9 +212,14 @@ static int w83627hf_init(struct watchdog_device *wdog, enum chips chip) t = superio_inb(cr_wdt_timeout); if (t != 0) { - pr_info("Watchdog already running. Resetting timeout to %d sec\n", - wdog->timeout); - superio_outb(cr_wdt_timeout, wdog->timeout); + if (early_disable) { + pr_warn("Stopping previously enabled watchdog until userland kicks in\n"); + superio_outb(cr_wdt_timeout, 0); + } else { + pr_info("Watchdog already running. Resetting timeout to %d sec\n", + wdog->timeout); + superio_outb(cr_wdt_timeout, wdog->timeout); + } } /* set second mode & disable keyboard turning off watchdog */ diff --git a/drivers/watchdog/w83697hf_wdt.c b/drivers/watchdog/w83697hf_wdt.c deleted file mode 100644 index e9ea856b8ff..00000000000 --- a/drivers/watchdog/w83697hf_wdt.c +++ /dev/null @@ -1,460 +0,0 @@ -/* - * w83697hf/hg WDT driver - * - * (c) Copyright 2006 Samuel Tardieu <sam@rfc1149.net> - * (c) Copyright 2006 Marcus Junker <junker@anduras.de> - * - * Based on w83627hf_wdt.c which is based on advantechwdt.c - * which is based on wdt.c. - * Original copyright messages: - * - * (c) Copyright 2003 Pádraig Brady <P@draigBrady.com> - * - * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl> - * - * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>, - * 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 - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * - * Neither Marcus Junker nor ANDURAS AG admit liability nor provide - * warranty for any of this software. This material is provided - * "AS-IS" and at no charge. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/fs.h> -#include <linux/ioport.h> -#include <linux/notifier.h> -#include <linux/reboot.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/io.h> -#include <linux/uaccess.h> - - -#define WATCHDOG_NAME "w83697hf/hg WDT" -#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ -#define WATCHDOG_EARLY_DISABLE 1 /* Disable until userland kicks in */ - -static unsigned long wdt_is_open; -static char expect_close; -static DEFINE_SPINLOCK(io_lock); - -/* You must set this - there is no sane way to probe for this board. */ -static int wdt_io = 0x2e; -module_param(wdt_io, int, 0); -MODULE_PARM_DESC(wdt_io, - "w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)"); - -static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ -module_param(timeout, int, 0); -MODULE_PARM_DESC(timeout, - "Watchdog timeout in seconds. 1<= timeout <=255 (default=" - __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); - -static bool nowayout = WATCHDOG_NOWAYOUT; -module_param(nowayout, bool, 0); -MODULE_PARM_DESC(nowayout, - "Watchdog cannot be stopped once started (default=" - __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); - -static int early_disable = WATCHDOG_EARLY_DISABLE; -module_param(early_disable, int, 0); -MODULE_PARM_DESC(early_disable, - "Watchdog gets disabled at boot time (default=" - __MODULE_STRING(WATCHDOG_EARLY_DISABLE) ")"); - -/* - * Kernel methods. - */ - -#define W83697HF_EFER (wdt_io + 0) /* Extended Function Enable Register */ -#define W83697HF_EFIR (wdt_io + 0) /* Extended Function Index Register - (same as EFER) */ -#define W83697HF_EFDR (wdt_io + 1) /* Extended Function Data Register */ - -static inline void w83697hf_unlock(void) -{ - outb_p(0x87, W83697HF_EFER); /* Enter extended function mode */ - outb_p(0x87, W83697HF_EFER); /* Again according to manual */ -} - -static inline void w83697hf_lock(void) -{ - outb_p(0xAA, W83697HF_EFER); /* Leave extended function mode */ -} - -/* - * The three functions w83697hf_get_reg(), w83697hf_set_reg() and - * w83697hf_write_timeout() must be called with the device unlocked. - */ - -static unsigned char w83697hf_get_reg(unsigned char reg) -{ - outb_p(reg, W83697HF_EFIR); - return inb_p(W83697HF_EFDR); -} - -static void w83697hf_set_reg(unsigned char reg, unsigned char data) -{ - outb_p(reg, W83697HF_EFIR); - outb_p(data, W83697HF_EFDR); -} - -static void w83697hf_write_timeout(int timeout) -{ - /* Write Timeout counter to CRF4 */ - w83697hf_set_reg(0xF4, timeout); -} - -static void w83697hf_select_wdt(void) -{ - w83697hf_unlock(); - w83697hf_set_reg(0x07, 0x08); /* Switch to logic device 8 (GPIO2) */ -} - -static inline void w83697hf_deselect_wdt(void) -{ - w83697hf_lock(); -} - -static void w83697hf_init(void) -{ - unsigned char bbuf; - - w83697hf_select_wdt(); - - bbuf = w83697hf_get_reg(0x29); - bbuf &= ~0x60; - bbuf |= 0x20; - - /* Set pin 119 to WDTO# mode (= CR29, WDT0) */ - w83697hf_set_reg(0x29, bbuf); - - bbuf = w83697hf_get_reg(0xF3); - bbuf &= ~0x04; - w83697hf_set_reg(0xF3, bbuf); /* Count mode is seconds */ - - w83697hf_deselect_wdt(); -} - -static void wdt_ping(void) -{ - spin_lock(&io_lock); - w83697hf_select_wdt(); - - w83697hf_write_timeout(timeout); - - w83697hf_deselect_wdt(); - spin_unlock(&io_lock); -} - -static void wdt_enable(void) -{ - spin_lock(&io_lock); - w83697hf_select_wdt(); - - w83697hf_write_timeout(timeout); - w83697hf_set_reg(0x30, 1); /* Enable timer */ - - w83697hf_deselect_wdt(); - spin_unlock(&io_lock); -} - -static void wdt_disable(void) -{ - spin_lock(&io_lock); - w83697hf_select_wdt(); - - w83697hf_set_reg(0x30, 0); /* Disable timer */ - w83697hf_write_timeout(0); - - w83697hf_deselect_wdt(); - spin_unlock(&io_lock); -} - -static unsigned char wdt_running(void) -{ - unsigned char t; - - spin_lock(&io_lock); - w83697hf_select_wdt(); - - t = w83697hf_get_reg(0xF4); /* Read timer */ - - w83697hf_deselect_wdt(); - spin_unlock(&io_lock); - - return t; -} - -static int wdt_set_heartbeat(int t) -{ - if (t < 1 || t > 255) - return -EINVAL; - - timeout = t; - return 0; -} - -static ssize_t wdt_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - if (count) { - if (!nowayout) { - size_t i; - - expect_close = 0; - - for (i = 0; i != count; i++) { - char c; - if (get_user(c, buf + i)) - return -EFAULT; - if (c == 'V') - expect_close = 42; - } - } - wdt_ping(); - } - return count; -} - -static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -{ - void __user *argp = (void __user *)arg; - int __user *p = argp; - int new_timeout; - static const struct watchdog_info ident = { - .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT - | WDIOF_MAGICCLOSE, - .firmware_version = 1, - .identity = "W83697HF WDT", - }; - - switch (cmd) { - case WDIOC_GETSUPPORT: - if (copy_to_user(argp, &ident, sizeof(ident))) - return -EFAULT; - break; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - - case WDIOC_SETOPTIONS: - { - int options, retval = -EINVAL; - - if (get_user(options, p)) - return -EFAULT; - - if (options & WDIOS_DISABLECARD) { - wdt_disable(); - retval = 0; - } - - if (options & WDIOS_ENABLECARD) { - wdt_enable(); - retval = 0; - } - - return retval; - } - - case WDIOC_KEEPALIVE: - wdt_ping(); - break; - - case WDIOC_SETTIMEOUT: - if (get_user(new_timeout, p)) - return -EFAULT; - if (wdt_set_heartbeat(new_timeout)) - return -EINVAL; - wdt_ping(); - /* Fall */ - - case WDIOC_GETTIMEOUT: - return put_user(timeout, p); - - default: - return -ENOTTY; - } - return 0; -} - -static int wdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(0, &wdt_is_open)) - return -EBUSY; - /* - * Activate - */ - - wdt_enable(); - return nonseekable_open(inode, file); -} - -static int wdt_close(struct inode *inode, struct file *file) -{ - if (expect_close == 42) - wdt_disable(); - else { - pr_crit("Unexpected close, not stopping watchdog!\n"); - wdt_ping(); - } - expect_close = 0; - clear_bit(0, &wdt_is_open); - return 0; -} - -/* - * Notifier for system down - */ - -static int wdt_notify_sys(struct notifier_block *this, unsigned long code, - void *unused) -{ - if (code == SYS_DOWN || code == SYS_HALT) - wdt_disable(); /* Turn the WDT off */ - - return NOTIFY_DONE; -} - -/* - * Kernel Interfaces - */ - -static const struct file_operations wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = wdt_write, - .unlocked_ioctl = wdt_ioctl, - .open = wdt_open, - .release = wdt_close, -}; - -static struct miscdevice wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &wdt_fops, -}; - -/* - * The WDT needs to learn about soft shutdowns in order to - * turn the timebomb registers off. - */ - -static struct notifier_block wdt_notifier = { - .notifier_call = wdt_notify_sys, -}; - -static int w83697hf_check_wdt(void) -{ - if (!request_region(wdt_io, 2, WATCHDOG_NAME)) { - pr_err("I/O address 0x%x already in use\n", wdt_io); - return -EIO; - } - - pr_debug("Looking for watchdog at address 0x%x\n", wdt_io); - w83697hf_unlock(); - if (w83697hf_get_reg(0x20) == 0x60) { - pr_info("watchdog found at address 0x%x\n", wdt_io); - w83697hf_lock(); - return 0; - } - /* Reprotect in case it was a compatible device */ - w83697hf_lock(); - - pr_info("watchdog not found at address 0x%x\n", wdt_io); - release_region(wdt_io, 2); - return -EIO; -} - -static int w83697hf_ioports[] = { 0x2e, 0x4e, 0x00 }; - -static int __init wdt_init(void) -{ - int ret, i, found = 0; - - pr_info("WDT driver for W83697HF/HG initializing\n"); - - if (wdt_io == 0) { - /* we will autodetect the W83697HF/HG watchdog */ - for (i = 0; ((!found) && (w83697hf_ioports[i] != 0)); i++) { - wdt_io = w83697hf_ioports[i]; - if (!w83697hf_check_wdt()) - found++; - } - } else { - if (!w83697hf_check_wdt()) - found++; - } - - if (!found) { - pr_err("No W83697HF/HG could be found\n"); - ret = -ENODEV; - goto out; - } - - w83697hf_init(); - if (early_disable) { - if (wdt_running()) - pr_warn("Stopping previously enabled watchdog until userland kicks in\n"); - wdt_disable(); - } - - if (wdt_set_heartbeat(timeout)) { - wdt_set_heartbeat(WATCHDOG_TIMEOUT); - pr_info("timeout value must be 1 <= timeout <= 255, using %d\n", - WATCHDOG_TIMEOUT); - } - - ret = register_reboot_notifier(&wdt_notifier); - if (ret != 0) { - pr_err("cannot register reboot notifier (err=%d)\n", ret); - goto unreg_regions; - } - - ret = misc_register(&wdt_miscdev); - if (ret != 0) { - pr_err("cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - goto unreg_reboot; - } - - pr_info("initialized. timeout=%d sec (nowayout=%d)\n", - timeout, nowayout); - -out: - return ret; -unreg_reboot: - unregister_reboot_notifier(&wdt_notifier); -unreg_regions: - release_region(wdt_io, 2); - goto out; -} - -static void __exit wdt_exit(void) -{ - misc_deregister(&wdt_miscdev); - unregister_reboot_notifier(&wdt_notifier); - release_region(wdt_io, 2); -} - -module_init(wdt_init); -module_exit(wdt_exit); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Marcus Junker <junker@anduras.de>"); -MODULE_AUTHOR("Samuel Tardieu <sam@rfc1149.net>"); -MODULE_DESCRIPTION("w83697hf/hg WDT driver"); diff --git a/drivers/watchdog/w83697ug_wdt.c b/drivers/watchdog/w83697ug_wdt.c deleted file mode 100644 index ff58cb74671..00000000000 --- a/drivers/watchdog/w83697ug_wdt.c +++ /dev/null @@ -1,397 +0,0 @@ -/* - * w83697ug/uf WDT driver - * - * (c) Copyright 2008 Flemming Fransen <ff@nrvissing.net> - * reused original code to support w83697ug/uf. - * - * Based on w83627hf_wdt.c which is based on advantechwdt.c - * which is based on wdt.c. - * Original copyright messages: - * - * (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com> - * added support for W83627THF. - * - * (c) Copyright 2003 Pádraig Brady <P@draigBrady.com> - * - * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl> - * - * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved. - * http://www.redhat.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. - * - * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide - * warranty for any of this software. This material is provided - * "AS-IS" and at no charge. - * - * (c) Copyright 1995 Alan Cox <alan@redhat.com> - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/fs.h> -#include <linux/ioport.h> -#include <linux/notifier.h> -#include <linux/reboot.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/io.h> -#include <linux/uaccess.h> - - -#define WATCHDOG_NAME "w83697ug/uf WDT" -#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ - -static unsigned long wdt_is_open; -static char expect_close; -static DEFINE_SPINLOCK(io_lock); - -static int wdt_io = 0x2e; -module_param(wdt_io, int, 0); -MODULE_PARM_DESC(wdt_io, "w83697ug/uf WDT io port (default 0x2e)"); - -static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ -module_param(timeout, int, 0); -MODULE_PARM_DESC(timeout, - "Watchdog timeout in seconds. 1<= timeout <=255 (default=" - __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); - -static bool nowayout = WATCHDOG_NOWAYOUT; -module_param(nowayout, bool, 0); -MODULE_PARM_DESC(nowayout, - "Watchdog cannot be stopped once started (default=" - __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); - -/* - * Kernel methods. - */ - -#define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */ -#define WDT_EFIR (wdt_io+0) /* Extended Function Index Register - (same as EFER) */ -#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */ - -static int w83697ug_select_wd_register(void) -{ - unsigned char c; - unsigned char version; - - outb_p(0x87, WDT_EFER); /* Enter extended function mode */ - outb_p(0x87, WDT_EFER); /* Again according to manual */ - - outb(0x20, WDT_EFER); /* check chip version */ - version = inb(WDT_EFDR); - - if (version == 0x68) { /* W83697UG */ - pr_info("Watchdog chip version 0x%02x = W83697UG/UF found at 0x%04x\n", - version, wdt_io); - - outb_p(0x2b, WDT_EFER); - c = inb_p(WDT_EFDR); /* select WDT0 */ - c &= ~0x04; - outb_p(0x2b, WDT_EFER); - outb_p(c, WDT_EFDR); /* set pin118 to WDT0 */ - - } else { - pr_err("No W83697UG/UF could be found\n"); - return -ENODEV; - } - - outb_p(0x07, WDT_EFER); /* point to logical device number reg */ - outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */ - outb_p(0x30, WDT_EFER); /* select CR30 */ - c = inb_p(WDT_EFDR); - outb_p(c | 0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */ - - return 0; -} - -static void w83697ug_unselect_wd_register(void) -{ - outb_p(0xAA, WDT_EFER); /* Leave extended function mode */ -} - -static int w83697ug_init(void) -{ - int ret; - unsigned char t; - - ret = w83697ug_select_wd_register(); - if (ret != 0) - return ret; - - outb_p(0xF6, WDT_EFER); /* Select CRF6 */ - t = inb_p(WDT_EFDR); /* read CRF6 */ - if (t != 0) { - pr_info("Watchdog already running. Resetting timeout to %d sec\n", - timeout); - outb_p(timeout, WDT_EFDR); /* Write back to CRF6 */ - } - outb_p(0xF5, WDT_EFER); /* Select CRF5 */ - t = inb_p(WDT_EFDR); /* read CRF5 */ - t &= ~0x0C; /* set second mode & - disable keyboard turning off watchdog */ - outb_p(t, WDT_EFDR); /* Write back to CRF5 */ - - w83697ug_unselect_wd_register(); - return 0; -} - -static void wdt_ctrl(int timeout) -{ - spin_lock(&io_lock); - - if (w83697ug_select_wd_register() < 0) { - spin_unlock(&io_lock); - return; - } - - outb_p(0xF4, WDT_EFER); /* Select CRF4 */ - outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF4 */ - - w83697ug_unselect_wd_register(); - - spin_unlock(&io_lock); -} - -static int wdt_ping(void) -{ - wdt_ctrl(timeout); - return 0; -} - -static int wdt_disable(void) -{ - wdt_ctrl(0); - return 0; -} - -static int wdt_set_heartbeat(int t) -{ - if (t < 1 || t > 255) - return -EINVAL; - - timeout = t; - return 0; -} - -static ssize_t wdt_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - if (count) { - if (!nowayout) { - size_t i; - - expect_close = 0; - - for (i = 0; i != count; i++) { - char c; - if (get_user(c, buf + i)) - return -EFAULT; - if (c == 'V') - expect_close = 42; - } - } - wdt_ping(); - } - return count; -} - -static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -{ - void __user *argp = (void __user *)arg; - int __user *p = argp; - int new_timeout; - static const struct watchdog_info ident = { - .options = WDIOF_KEEPALIVEPING | - WDIOF_SETTIMEOUT | - WDIOF_MAGICCLOSE, - .firmware_version = 1, - .identity = "W83697UG WDT", - }; - - switch (cmd) { - case WDIOC_GETSUPPORT: - if (copy_to_user(argp, &ident, sizeof(ident))) - return -EFAULT; - break; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - - case WDIOC_SETOPTIONS: - { - int options, retval = -EINVAL; - - if (get_user(options, p)) - return -EFAULT; - - if (options & WDIOS_DISABLECARD) { - wdt_disable(); - retval = 0; - } - - if (options & WDIOS_ENABLECARD) { - wdt_ping(); - retval = 0; - } - - return retval; - } - - case WDIOC_KEEPALIVE: - wdt_ping(); - break; - - case WDIOC_SETTIMEOUT: - if (get_user(new_timeout, p)) - return -EFAULT; - if (wdt_set_heartbeat(new_timeout)) - return -EINVAL; - wdt_ping(); - /* Fall */ - - case WDIOC_GETTIMEOUT: - return put_user(timeout, p); - - default: - return -ENOTTY; - } - return 0; -} - -static int wdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(0, &wdt_is_open)) - return -EBUSY; - /* - * Activate - */ - - wdt_ping(); - return nonseekable_open(inode, file); -} - -static int wdt_close(struct inode *inode, struct file *file) -{ - if (expect_close == 42) - wdt_disable(); - else { - pr_crit("Unexpected close, not stopping watchdog!\n"); - wdt_ping(); - } - expect_close = 0; - clear_bit(0, &wdt_is_open); - return 0; -} - -/* - * Notifier for system down - */ - -static int wdt_notify_sys(struct notifier_block *this, unsigned long code, - void *unused) -{ - if (code == SYS_DOWN || code == SYS_HALT) - wdt_disable(); /* Turn the WDT off */ - - return NOTIFY_DONE; -} - -/* - * Kernel Interfaces - */ - -static const struct file_operations wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = wdt_write, - .unlocked_ioctl = wdt_ioctl, - .open = wdt_open, - .release = wdt_close, -}; - -static struct miscdevice wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &wdt_fops, -}; - -/* - * The WDT needs to learn about soft shutdowns in order to - * turn the timebomb registers off. - */ - -static struct notifier_block wdt_notifier = { - .notifier_call = wdt_notify_sys, -}; - -static int __init wdt_init(void) -{ - int ret; - - pr_info("WDT driver for the Winbond(TM) W83697UG/UF Super I/O chip initialising\n"); - - if (wdt_set_heartbeat(timeout)) { - wdt_set_heartbeat(WATCHDOG_TIMEOUT); - pr_info("timeout value must be 1<=timeout<=255, using %d\n", - WATCHDOG_TIMEOUT); - } - - if (!request_region(wdt_io, 1, WATCHDOG_NAME)) { - pr_err("I/O address 0x%04x already in use\n", wdt_io); - ret = -EIO; - goto out; - } - - ret = w83697ug_init(); - if (ret != 0) - goto unreg_regions; - - ret = register_reboot_notifier(&wdt_notifier); - if (ret != 0) { - pr_err("cannot register reboot notifier (err=%d)\n", ret); - goto unreg_regions; - } - - ret = misc_register(&wdt_miscdev); - if (ret != 0) { - pr_err("cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - goto unreg_reboot; - } - - pr_info("initialized. timeout=%d sec (nowayout=%d)\n", - timeout, nowayout); - -out: - return ret; -unreg_reboot: - unregister_reboot_notifier(&wdt_notifier); -unreg_regions: - release_region(wdt_io, 1); - goto out; -} - -static void __exit wdt_exit(void) -{ - misc_deregister(&wdt_miscdev); - unregister_reboot_notifier(&wdt_notifier); - release_region(wdt_io, 1); -} - -module_init(wdt_init); -module_exit(wdt_exit); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Flemming Frandsen <ff@nrvissing.net>"); -MODULE_DESCRIPTION("w83697ug/uf WDT driver"); diff --git a/include/linux/platform_data/intel-mid_wdt.h b/include/linux/platform_data/intel-mid_wdt.h new file mode 100644 index 00000000000..b98253466ac --- /dev/null +++ b/include/linux/platform_data/intel-mid_wdt.h @@ -0,0 +1,22 @@ +/* + * intel-mid_wdt: generic Intel MID SCU watchdog driver + * + * Copyright (C) 2014 Intel Corporation. All rights reserved. + * Contact: David Cohen <david.a.cohen@linux.intel.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General + * Public License as published by the Free Software Foundation. + */ + +#ifndef __INTEL_MID_WDT_H__ +#define __INTEL_MID_WDT_H__ + +#include <linux/platform_device.h> + +struct intel_mid_wdt_pdata { + int irq; + int (*probe)(struct platform_device *pdev); +}; + +#endif /*__INTEL_MID_WDT_H__*/ |