From d99241c86f6ccd1226935f8f59d3bb17a4186b85 Mon Sep 17 00:00:00 2001 From: Madhusudhan Chikkature Rajashekar Date: Wed, 31 Oct 2007 05:40:50 -0700 Subject: [PATCH] RE: [PATCH] Add WDT support for OMAP3430 Add watchdog timer support for TI OMAP3430. Fix clk_put functions mismatch in the release fn which would crash the kernel if the WDT test is run multiple times with "CONFIG_WATCHDOG_NOWAYOUT" disabled. Fix the shutdown function.Check for wdt users before calling disable. Signed-off-by: Madhusudhan Chikkature Updated for path change to drivers/watchdog. Signed-off-by: Tony Lindgren --- arch/arm/configs/omap_3430sdp_defconfig | 1 + arch/arm/plat-omap/devices.c | 4 +- drivers/watchdog/Kconfig | 6 +- drivers/watchdog/omap_wdt.c | 281 +++++++++++++++--------- 4 files changed, 185 insertions(+), 107 deletions(-) diff --git a/arch/arm/configs/omap_3430sdp_defconfig b/arch/arm/configs/omap_3430sdp_defconfig index f68ec4bb955..8278bd858d9 100644 --- a/arch/arm/configs/omap_3430sdp_defconfig +++ b/arch/arm/configs/omap_3430sdp_defconfig @@ -595,6 +595,7 @@ CONFIG_WATCHDOG_NOWAYOUT=y # Watchdog Device Drivers # # CONFIG_SOFT_WATCHDOG is not set +CONFIG_OMAP_WATCHDOG=y CONFIG_HW_RANDOM=y # CONFIG_NVRAM is not set # CONFIG_R3964 is not set diff --git a/arch/arm/plat-omap/devices.c b/arch/arm/plat-omap/devices.c index c2828fe3dd7..6b795ab24e3 100644 --- a/arch/arm/plat-omap/devices.c +++ b/arch/arm/plat-omap/devices.c @@ -437,7 +437,9 @@ static inline void omap_init_uwire(void) {} #if defined(CONFIG_OMAP_WATCHDOG) || defined(CONFIG_OMAP_WATCHDOG_MODULE) -#ifdef CONFIG_ARCH_OMAP24XX +#if defined(CONFIG_ARCH_OMAP34XX) +#define OMAP_WDT_BASE 0x48314000 +#elif defined(CONFIG_ARCH_OMAP24XX) #ifdef CONFIG_ARCH_OMAP2430 /* WDT2 */ diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 37bddc1802d..f84b2e79f1c 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -173,10 +173,10 @@ config EP93XX_WATCHDOG config OMAP_WATCHDOG tristate "OMAP Watchdog" - depends on ARCH_OMAP16XX || ARCH_OMAP24XX + depends on ARCH_OMAP16XX || ARCH_OMAP24XX || ARCH_OMAP34XX help - Support for TI OMAP1610/OMAP1710/OMAP2420 watchdog. Say 'Y' here to - enable the OMAP1610/OMAP1710 watchdog timer. + Support for TI OMAP1610/OMAP1710/OMAP2420/OMAP3430 watchdog. Say 'Y' + here to enable the OMAP1610/OMAP1710/OMAP2420/OMAP3430 watchdog timer. config PNX4008_WATCHDOG tristate "PNX4008 Watchdog" diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c index 635ca454f56..e939a5fd9cd 100644 --- a/drivers/watchdog/omap_wdt.c +++ b/drivers/watchdog/omap_wdt.c @@ -1,7 +1,7 @@ /* - * linux/drivers/char/watchdog/omap_wdt.c + * linux/drivers/watchdog/omap_wdt.c * - * Watchdog driver for the TI OMAP 16xx & 24xx 32KHz (non-secure) watchdog + * Watchdog driver for the TI OMAP 16xx & 24xx/34xx 32KHz (non-secure) watchdog * * Author: MontaVista Software, Inc. * or @@ -39,59 +39,71 @@ #include #include #include -#include #include #include #include +#include #include #include "omap_wdt.h" +static struct platform_device *omap_wdt_dev; + static unsigned timer_margin; module_param(timer_margin, uint, 0); MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)"); -static int omap_wdt_users; -static struct clk *armwdt_ck = NULL; -static struct clk *mpu_wdt_ick = NULL; -static struct clk *mpu_wdt_fck = NULL; - static unsigned int wdt_trgr_pattern = 0x1234; +struct omap_wdt_dev { + void __iomem *base; /* physical */ + struct device *dev; + int omap_wdt_users; + struct clk *armwdt_ck; + struct clk *mpu_wdt_ick; + struct clk *mpu_wdt_fck; + struct resource *mem; + struct miscdevice omap_wdt_miscdev; +}; -static void omap_wdt_ping(void) +static void omap_wdt_ping(struct omap_wdt_dev *wdev) { + void __iomem *base = wdev->base; /* wait for posted write to complete */ - while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x08) + while ((omap_readl(base + OMAP_WATCHDOG_WPS)) & 0x08) cpu_relax(); wdt_trgr_pattern = ~wdt_trgr_pattern; - omap_writel(wdt_trgr_pattern, (OMAP_WATCHDOG_TGR)); + omap_writel(wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR)); /* wait for posted write to complete */ - while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x08) + while ((omap_readl(base + OMAP_WATCHDOG_WPS)) & 0x08) cpu_relax(); /* reloaded WCRR from WLDR */ } -static void omap_wdt_enable(void) +static void omap_wdt_enable(struct omap_wdt_dev *wdev) { + void __iomem *base; + base = wdev->base; /* Sequence to enable the watchdog */ - omap_writel(0xBBBB, OMAP_WATCHDOG_SPR); - while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x10) + omap_writel(0xBBBB, base + OMAP_WATCHDOG_SPR); + while ((omap_readl(base + OMAP_WATCHDOG_WPS)) & 0x10) cpu_relax(); - omap_writel(0x4444, OMAP_WATCHDOG_SPR); - while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x10) + omap_writel(0x4444, base + OMAP_WATCHDOG_SPR); + while ((omap_readl(base + OMAP_WATCHDOG_WPS)) & 0x10) cpu_relax(); } -static void omap_wdt_disable(void) +static void omap_wdt_disable(struct omap_wdt_dev *wdev) { + void __iomem *base; + base = wdev->base; /* sequence required to disable watchdog */ - omap_writel(0xAAAA, OMAP_WATCHDOG_SPR); /* TIMER_MODE */ - while (omap_readl(OMAP_WATCHDOG_WPS) & 0x10) + omap_writel(0xAAAA, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */ + while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x10) cpu_relax(); - omap_writel(0x5555, OMAP_WATCHDOG_SPR); /* TIMER_MODE */ - while (omap_readl(OMAP_WATCHDOG_WPS) & 0x10) + omap_writel(0x5555, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */ + while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x10) cpu_relax(); } @@ -104,15 +116,17 @@ static void omap_wdt_adjust_timeout(unsigned new_timeout) timer_margin = new_timeout; } -static void omap_wdt_set_timeout(void) +static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev) { u32 pre_margin = GET_WLDR_VAL(timer_margin); + void __iomem *base; + base = wdev->base; /* just count up at 32 KHz */ - while (omap_readl(OMAP_WATCHDOG_WPS) & 0x04) + while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x04) cpu_relax(); - omap_writel(pre_margin, OMAP_WATCHDOG_LDR); - while (omap_readl(OMAP_WATCHDOG_WPS) & 0x04) + omap_writel(pre_margin, base + OMAP_WATCHDOG_LDR); + while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x04) cpu_relax(); } @@ -122,55 +136,57 @@ static void omap_wdt_set_timeout(void) static int omap_wdt_open(struct inode *inode, struct file *file) { - if (test_and_set_bit(1, (unsigned long *)&omap_wdt_users)) + struct omap_wdt_dev *wdev; + void __iomem *base; + wdev = platform_get_drvdata(omap_wdt_dev); + base = wdev->base; + if (test_and_set_bit(1, (unsigned long *)&(wdev->omap_wdt_users))) return -EBUSY; if (cpu_is_omap16xx()) - clk_enable(armwdt_ck); /* Enable the clock */ + clk_enable(wdev->armwdt_ck); /* Enable the clock */ - if (cpu_is_omap24xx()) { - clk_enable(mpu_wdt_ick); /* Enable the interface clock */ - clk_enable(mpu_wdt_fck); /* Enable the functional clock */ + if (cpu_is_omap24xx() || cpu_is_omap34xx()) { + clk_enable(wdev->mpu_wdt_ick); /* Enable the interface clock */ + clk_enable(wdev->mpu_wdt_fck); /* Enable the functional clock */ } /* initialize prescaler */ - while (omap_readl(OMAP_WATCHDOG_WPS) & 0x01) + while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x01) cpu_relax(); - omap_writel((1 << 5) | (PTV << 2), OMAP_WATCHDOG_CNTRL); - while (omap_readl(OMAP_WATCHDOG_WPS) & 0x01) + omap_writel((1 << 5) | (PTV << 2), base + OMAP_WATCHDOG_CNTRL); + while (omap_readl(base + OMAP_WATCHDOG_WPS) & 0x01) cpu_relax(); - omap_wdt_set_timeout(); - omap_wdt_enable(); + file->private_data = (void *) wdev; + + omap_wdt_set_timeout(wdev); + omap_wdt_enable(wdev); return nonseekable_open(inode, file); } static int omap_wdt_release(struct inode *inode, struct file *file) { + struct omap_wdt_dev *wdev; + wdev = file->private_data; /* * Shut off the timer unless NOWAYOUT is defined. */ #ifndef CONFIG_WATCHDOG_NOWAYOUT - omap_wdt_disable(); - if (cpu_is_omap16xx()) { - clk_disable(armwdt_ck); /* Disable the clock */ - clk_put(armwdt_ck); - armwdt_ck = NULL; - } + omap_wdt_disable(wdev); - if (cpu_is_omap24xx()) { - clk_disable(mpu_wdt_ick); /* Disable the clock */ - clk_disable(mpu_wdt_fck); /* Disable the clock */ - clk_put(mpu_wdt_ick); - clk_put(mpu_wdt_fck); - mpu_wdt_ick = NULL; - mpu_wdt_fck = NULL; + if (cpu_is_omap16xx()) + clk_disable(wdev->armwdt_ck); /* Disable the clock */ + + if (cpu_is_omap24xx() || cpu_is_omap34xx()) { + clk_disable(wdev->mpu_wdt_ick); /* Disable the clock */ + clk_disable(wdev->mpu_wdt_fck); /* Disable the clock */ } #else printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n"); #endif - omap_wdt_users = 0; + wdev->omap_wdt_users = 0; return 0; } @@ -178,9 +194,11 @@ static ssize_t omap_wdt_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) { + struct omap_wdt_dev *wdev; + wdev = file->private_data; /* Refresh LOAD_TIME. */ if (len) - omap_wdt_ping(); + omap_wdt_ping(wdev); return len; } @@ -188,12 +206,14 @@ static int omap_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { + struct omap_wdt_dev *wdev; int new_margin; static struct watchdog_info ident = { .identity = "OMAP Watchdog", .options = WDIOF_SETTIMEOUT, .firmware_version = 0, }; + wdev = file->private_data; switch (cmd) { default: @@ -211,22 +231,23 @@ omap_wdt_ioctl(struct inode *inode, struct file *file, return put_user(omap_prcm_get_reset_sources(), (int __user *)arg); case WDIOC_KEEPALIVE: - omap_wdt_ping(); + omap_wdt_ping(wdev); return 0; case WDIOC_SETTIMEOUT: if (get_user(new_margin, (int __user *)arg)) return -EFAULT; omap_wdt_adjust_timeout(new_margin); - omap_wdt_disable(); - omap_wdt_set_timeout(); - omap_wdt_enable(); + omap_wdt_disable(wdev); + omap_wdt_set_timeout(wdev); + omap_wdt_enable(wdev); - omap_wdt_ping(); + omap_wdt_ping(wdev); /* Fall */ case WDIOC_GETTIMEOUT: return put_user(timer_margin, (int __user *)arg); } + return 0; } static const struct file_operations omap_wdt_fops = { @@ -237,96 +258,146 @@ static const struct file_operations omap_wdt_fops = { .release = omap_wdt_release, }; -static struct miscdevice omap_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &omap_wdt_fops -}; static int __init omap_wdt_probe(struct platform_device *pdev) { struct resource *res, *mem; int ret; + struct omap_wdt_dev *wdev; /* reserve static register mappings */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -ENOENT; + if (omap_wdt_dev) + return -EBUSY; + mem = request_mem_region(res->start, res->end - res->start + 1, pdev->name); if (mem == NULL) return -EBUSY; - platform_set_drvdata(pdev, mem); - - omap_wdt_users = 0; + wdev = kzalloc(sizeof(struct omap_wdt_dev), GFP_KERNEL); + if (!wdev) { + ret = -ENOMEM; + goto fail; + } + wdev->omap_wdt_users = 0; + wdev->mem = mem; if (cpu_is_omap16xx()) { - armwdt_ck = clk_get(&pdev->dev, "armwdt_ck"); - if (IS_ERR(armwdt_ck)) { - ret = PTR_ERR(armwdt_ck); - armwdt_ck = NULL; + wdev->armwdt_ck = clk_get(&pdev->dev, "armwdt_ck"); + if (IS_ERR(wdev->armwdt_ck)) { + ret = PTR_ERR(wdev->armwdt_ck); + wdev->armwdt_ck = NULL; goto fail; } } if (cpu_is_omap24xx()) { - mpu_wdt_ick = clk_get(&pdev->dev, "mpu_wdt_ick"); - if (IS_ERR(mpu_wdt_ick)) { - ret = PTR_ERR(mpu_wdt_ick); - mpu_wdt_ick = NULL; + wdev->mpu_wdt_ick = clk_get(&pdev->dev, "mpu_wdt_ick"); + if (IS_ERR(wdev->mpu_wdt_ick)) { + ret = PTR_ERR(wdev->mpu_wdt_ick); + wdev->mpu_wdt_ick = NULL; + goto fail; + } + wdev->mpu_wdt_fck = clk_get(&pdev->dev, "mpu_wdt_fck"); + if (IS_ERR(wdev->mpu_wdt_fck)) { + ret = PTR_ERR(wdev->mpu_wdt_fck); + wdev->mpu_wdt_fck = NULL; + goto fail; + } + } + + if (cpu_is_omap34xx()) { + wdev->mpu_wdt_ick = clk_get(&pdev->dev, "wdt2_ick"); + if (IS_ERR(wdev->mpu_wdt_ick)) { + ret = PTR_ERR(wdev->mpu_wdt_ick); + wdev->mpu_wdt_ick = NULL; goto fail; } - mpu_wdt_fck = clk_get(&pdev->dev, "mpu_wdt_fck"); - if (IS_ERR(mpu_wdt_fck)) { - ret = PTR_ERR(mpu_wdt_fck); - mpu_wdt_fck = NULL; + wdev->mpu_wdt_fck = clk_get(&pdev->dev, "wdt2_fck"); + if (IS_ERR(wdev->mpu_wdt_fck)) { + ret = PTR_ERR(wdev->mpu_wdt_fck); + wdev->mpu_wdt_fck = NULL; goto fail; } } + wdev->base = (void __iomem *) (mem->start); + platform_set_drvdata(pdev, wdev); - omap_wdt_disable(); + omap_wdt_disable(wdev); omap_wdt_adjust_timeout(timer_margin); - omap_wdt_miscdev.parent = &pdev->dev; - ret = misc_register(&omap_wdt_miscdev); + wdev->omap_wdt_miscdev.parent = &pdev->dev; + wdev->omap_wdt_miscdev.minor = WATCHDOG_MINOR; + wdev->omap_wdt_miscdev.name = "watchdog"; + wdev->omap_wdt_miscdev.fops = &omap_wdt_fops; + + ret = misc_register(&(wdev->omap_wdt_miscdev)); if (ret) goto fail; - pr_info("OMAP Watchdog Timer: initial timeout %d sec\n", timer_margin); + pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n", + omap_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF, + timer_margin); /* autogate OCP interface clock */ - omap_writel(0x01, OMAP_WATCHDOG_SYS_CONFIG); + omap_writel(0x01, wdev->base + OMAP_WATCHDOG_SYS_CONFIG); + + omap_wdt_dev = pdev; + return 0; fail: - if (armwdt_ck) - clk_put(armwdt_ck); - if (mpu_wdt_ick) - clk_put(mpu_wdt_ick); - if (mpu_wdt_fck) - clk_put(mpu_wdt_fck); - release_resource(mem); + if (wdev) { + platform_set_drvdata(pdev, NULL); + if (wdev->armwdt_ck) + clk_put(wdev->armwdt_ck); + if (wdev->mpu_wdt_ick) + clk_put(wdev->mpu_wdt_ick); + if (wdev->mpu_wdt_fck) + clk_put(wdev->mpu_wdt_fck); + kfree(wdev); + } + if (mem) { + release_resource(mem); + } return ret; } static void omap_wdt_shutdown(struct platform_device *pdev) { - omap_wdt_disable(); + struct omap_wdt_dev *wdev; + wdev = platform_get_drvdata(pdev); + + if (wdev->omap_wdt_users) + omap_wdt_disable(wdev); } static int omap_wdt_remove(struct platform_device *pdev) { - struct resource *mem = platform_get_drvdata(pdev); - misc_deregister(&omap_wdt_miscdev); - release_resource(mem); - if (armwdt_ck) - clk_put(armwdt_ck); - if (mpu_wdt_ick) - clk_put(mpu_wdt_ick); - if (mpu_wdt_fck) - clk_put(mpu_wdt_fck); + struct omap_wdt_dev *wdev; + wdev = platform_get_drvdata(pdev); + + misc_deregister(&(wdev->omap_wdt_miscdev)); + release_resource(wdev->mem); + platform_set_drvdata(pdev, NULL); + if (wdev->armwdt_ck) { + clk_put(wdev->armwdt_ck); + wdev->armwdt_ck = NULL; + } + if (wdev->mpu_wdt_ick) { + clk_put(wdev->mpu_wdt_ick); + wdev->mpu_wdt_ick = NULL; + } + if (wdev->mpu_wdt_fck) { + clk_put(wdev->mpu_wdt_fck); + wdev->mpu_wdt_fck = NULL; + } + kfree(wdev); + omap_wdt_dev = NULL; return 0; } @@ -340,16 +411,20 @@ static int omap_wdt_remove(struct platform_device *pdev) static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state) { - if (omap_wdt_users) - omap_wdt_disable(); + struct omap_wdt_dev *wdev; + wdev = platform_get_drvdata(pdev); + if (wdev->omap_wdt_users) + omap_wdt_disable(wdev); return 0; } static int omap_wdt_resume(struct platform_device *pdev) { - if (omap_wdt_users) { - omap_wdt_enable(); - omap_wdt_ping(); + struct omap_wdt_dev *wdev; + wdev = platform_get_drvdata(pdev); + if (wdev->omap_wdt_users) { + omap_wdt_enable(wdev); + omap_wdt_ping(wdev); } return 0; } -- 2.41.1