diff options
Diffstat (limited to 'drivers/watchdog/omap_wdt.c')
-rw-r--r-- | drivers/watchdog/omap_wdt.c | 283 |
1 files changed, 181 insertions, 102 deletions
diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c index 3a11dad..7de16a3 100644 --- a/drivers/watchdog/omap_wdt.c +++ b/drivers/watchdog/omap_wdt.c @@ -1,7 +1,7 @@ /* - * linux/drivers/char/watchdog/omap_wdt.c + * 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. * <gdavis@mvista.com> or <source@mvista.com> @@ -47,50 +47,63 @@ #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; -static struct clk *mpu_wdt_ick; -static struct clk *mpu_wdt_fck; - static unsigned int wdt_trgr_pattern = 0x1234; static spinlock_t wdt_lock; -static void omap_wdt_ping(void) +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(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(); } @@ -103,15 +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(); } @@ -121,65 +136,69 @@ 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; } 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) { spin_lock(&wdt_lock); - omap_wdt_ping(); + omap_wdt_ping(wdev); spin_unlock(&wdt_lock); } return len; @@ -188,12 +207,14 @@ static ssize_t omap_wdt_write(struct file *file, const char __user *data, static long omap_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { + struct omap_wdt_dev *wdev; int new_margin; static const struct watchdog_info ident = { .identity = "OMAP Watchdog", .options = WDIOF_SETTIMEOUT, .firmware_version = 0, }; + wdev = file->private_data; switch (cmd) { case WDIOC_GETSUPPORT: @@ -210,7 +231,7 @@ static long omap_wdt_ioctl(struct file *file, unsigned int cmd, (int __user *)arg); case WDIOC_KEEPALIVE: spin_lock(&wdt_lock); - omap_wdt_ping(); + omap_wdt_ping(wdev); spin_unlock(&wdt_lock); return 0; case WDIOC_SETTIMEOUT: @@ -219,11 +240,11 @@ static long omap_wdt_ioctl(struct file *file, unsigned int cmd, omap_wdt_adjust_timeout(new_margin); spin_lock(&wdt_lock); - 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); spin_unlock(&wdt_lock); /* Fall */ case WDIOC_GETTIMEOUT: @@ -241,96 +262,150 @@ 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_mem_region(res->start, res->end - res->start + 1); + } 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); + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + if (!res) + return -ENOENT; + + misc_deregister(&(wdev->omap_wdt_miscdev)); + release_mem_region(res->start, res->end - res->start + 1); + 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; } @@ -344,16 +419,20 @@ 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; } |