/* * coh901327_wdt.c * * Copyright (C) 2008-2009 ST-Ericsson AB * License terms: GNU General Public License (GPL) version 2 * Watchdog driver for the ST-Ericsson AB COH 901 327 IP core * Author: Linus Walleij <linus.walleij@stericsson.com> */ #include <linux/module.h> #include <linux/types.h> #include <linux/fs.h> #include <linux/miscdevice.h> #include <linux/watchdog.h> #include <linux/interrupt.h> #include <linux/pm.h> #include <linux/platform_device.h> #include <linux/io.h> #include <linux/bitops.h> #include <linux/uaccess.h> #include <linux/clk.h> #include <linux/delay.h> #define DRV_NAME "WDOG COH 901 327" /* * COH 901 327 register definitions */ /* WDOG_FEED Register 32bit (-/W) */ #define U300_WDOG_FR 0x00 #define U300_WDOG_FR_FEED_RESTART_TIMER 0xFEEDU /* WDOG_TIMEOUT Register 32bit (R/W) */ #define U300_WDOG_TR 0x04 #define U300_WDOG_TR_TIMEOUT_MASK 0x7FFFU /* WDOG_DISABLE1 Register 32bit (-/W) */ #define U300_WDOG_D1R 0x08 #define U300_WDOG_D1R_DISABLE1_DISABLE_TIMER 0x2BADU /* WDOG_DISABLE2 Register 32bit (R/W) */ #define U300_WDOG_D2R 0x0C #define U300_WDOG_D2R_DISABLE2_DISABLE_TIMER 0xCAFEU #define U300_WDOG_D2R_DISABLE_STATUS_DISABLED 0xDABEU #define U300_WDOG_D2R_DISABLE_STATUS_ENABLED 0x0000U /* WDOG_STATUS Register 32bit (R/W) */ #define U300_WDOG_SR 0x10 #define U300_WDOG_SR_STATUS_TIMED_OUT 0xCFE8U #define U300_WDOG_SR_STATUS_NORMAL 0x0000U #define U300_WDOG_SR_RESET_STATUS_RESET 0xE8B4U /* WDOG_COUNT Register 32bit (R/-) */ #define U300_WDOG_CR 0x14 #define U300_WDOG_CR_VALID_IND 0x8000U #define U300_WDOG_CR_VALID_STABLE 0x0000U #define U300_WDOG_CR_COUNT_VALUE_MASK 0x7FFFU /* WDOG_JTAGOVR Register 32bit (R/W) */ #define U300_WDOG_JOR 0x18 #define U300_WDOG_JOR_JTAG_MODE_IND 0x0002U #define U300_WDOG_JOR_JTAG_WATCHDOG_ENABLE 0x0001U /* WDOG_RESTART Register 32bit (-/W) */ #define U300_WDOG_RR 0x1C #define U300_WDOG_RR_RESTART_VALUE_RESUME 0xACEDU /* WDOG_IRQ_EVENT Register 32bit (R/W) */ #define U300_WDOG_IER 0x20 #define U300_WDOG_IER_WILL_BARK_IRQ_EVENT_IND 0x0001U #define U300_WDOG_IER_WILL_BARK_IRQ_ACK_ENABLE 0x0001U /* WDOG_IRQ_MASK Register 32bit (R/W) */ #define U300_WDOG_IMR 0x24 #define U300_WDOG_IMR_WILL_BARK_IRQ_ENABLE 0x0001U /* WDOG_IRQ_FORCE Register 32bit (R/W) */ #define U300_WDOG_IFR 0x28 #define U300_WDOG_IFR_WILL_BARK_IRQ_FORCE_ENABLE 0x0001U /* Default timeout in seconds = 1 minute */ static int margin = 60; static resource_size_t phybase; static resource_size_t physize; static int irq; static void __iomem *virtbase; static unsigned long coh901327_users; static unsigned long boot_status; static u16 wdogenablestore; static u16 irqmaskstore; static struct device *parent; /* * The watchdog block is of course always clocked, the * clk_enable()/clk_disable() calls are mainly for performing reference * counting higher up in the clock hierarchy. */ static struct clk *clk; /* * Enabling and disabling functions. */ static void coh901327_enable(u16 timeout) { u16 val; unsigned long freq; unsigned long delay_ns; clk_enable(clk); /* Restart timer if it is disabled */ val = readw(virtbase + U300_WDOG_D2R); if (val == U300_WDOG_D2R_DISABLE_STATUS_DISABLED) writew(U300_WDOG_RR_RESTART_VALUE_RESUME, virtbase + U300_WDOG_RR); /* Acknowledge any pending interrupt so it doesn't just fire off */ writew(U300_WDOG_IER_WILL_BARK_IRQ_ACK_ENABLE, virtbase + U300_WDOG_IER); /* * The interrupt is cleared in the 32 kHz clock domain. * Wait 3 32 kHz cycles for it to take effect */ freq = clk_get_rate(clk); delay_ns = DIV_ROUND_UP(1000000000, freq); /* Freq to ns and round up */ delay_ns = 3 * delay_ns; /* Wait 3 cycles */ ndelay(delay_ns); /* Enable the watchdog interrupt */ writew(U300_WDOG_IMR_WILL_BARK_IRQ_ENABLE, virtbase + U300_WDOG_IMR); /* Activate the watchdog timer */ writew(timeout, virtbase + U300_WDOG_TR); /* Start the watchdog timer */ writew(U300_WDOG_FR_FEED_RESTART_TIMER, virtbase + U300_WDOG_FR); /* * Extra read so that this change propagate in the watchdog. */ (void) readw(virtbase + U300_WDOG_CR); val = readw(virtbase + U300_WDOG_D2R); clk_disable(clk); if (val != U300_WDOG_D2R_DISABLE_STATUS_ENABLED) dev_err(parent, "%s(): watchdog not enabled! D2R value %04x\n", __func__, val); } static void coh901327_disable(void) { u16 val; clk_enable(clk); /* Disable the watchdog interrupt if it is active */ writew(0x0000U, virtbase + U300_WDOG_IMR); /* If the watchdog is currently enabled, attempt to disable it */ val = readw(virtbase + U300_WDOG_D2R); if (val != U300_WDOG_D2R_DISABLE_STATUS_DISABLED) { writew(U300_WDOG_D1R_DISABLE1_DISABLE_TIMER, virtbase + U300_WDOG_D1R); writew(U300_WDOG_D2R_DISABLE2_DISABLE_TIMER, virtbase + U300_WDOG_D2R); /* Write this twice (else problems occur) */ writew(U300_WDOG_D2R_DISABLE2_DISABLE_TIMER, virtbase + U300_WDOG_D2R); } val = readw(virtbase + U300_WDOG_D2R); clk_disable(clk); if (val != U300_WDOG_D2R_DISABLE_STATUS_DISABLED) dev_err(parent, "%s(): watchdog not disabled! D2R value %04x\n", __func__, val); } static void coh901327_start(void) { coh901327_enable(margin * 100); } static void coh901327_keepalive(void) { clk_enable(clk); /* Feed the watchdog */ writew(U300_WDOG_FR_FEED_RESTART_TIMER, virtbase + U300_WDOG_FR); clk_disable(clk); } static int coh901327_settimeout(int time) { /* * Max margin is 327 since the 10ms * timeout register is max * 0x7FFF = 327670ms ~= 327s. */ if (time <= 0 || time > 327) return -EINVAL; margin = time; clk_enable(clk); /* Set new timeout value */ writew(margin * 100, virtbase + U300_WDOG_TR); /* Feed the dog */ writew(U300_WDOG_FR_FEED_RESTART_TIMER, virtbase + U300_WDOG_FR); clk_disable(clk); return 0; } /* * This interrupt occurs 10 ms before the watchdog WILL bark. */ static irqreturn_t coh901327_interrupt(int irq, void *data) { u16 val; /* * Ack IRQ? If this occurs we're FUBAR anyway, so * just acknowledge, disable the interrupt and await the imminent end. * If you at some point need a host of callbacks to be called * when the system is about to watchdog-reset, add them here! * * NOTE: on future versions of this IP-block, it will be possible * to prevent a watchdog reset by feeding the watchdog at this * point. */ clk_enable(clk); val = readw(virtbase + U300_WDOG_IER); if (val == U300_WDOG_IER_WILL_BARK_IRQ_EVENT_IND) writew(U300_WDOG_IER_WILL_BARK_IRQ_ACK_ENABLE, virtbase + U300_WDOG_IER); writew(0x0000U, virtbase + U300_WDOG_IMR); clk_disable(clk); dev_crit(parent, "watchdog is barking!\n"); return IRQ_HANDLED; } /* * Allow only one user (daemon) to open the watchdog */ static int coh901327_open(struct inode *inode, struct file *file) { if (test_and_set_bit(1, &coh901327_users)) return -EBUSY; coh901327_start(); return nonseekable_open(inode, file); } static int coh901327_release(struct inode *inode, struct file *file) { clear_bit(1, &coh901327_users); coh901327_disable(); return 0; } static ssize_t coh901327_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) { if (len) coh901327_keepalive(); return len; } static long coh901327_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { int ret = -ENOTTY; u16 val; int time; int new_options; union { struct watchdog_info __user *ident; int __user *i; } uarg; static struct watchdog_info ident = { .options = WDIOF_CARDRESET | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, .identity = "COH 901 327 Watchdog", .firmware_version = 1, }; uarg.i = (int __user *)arg; switch (cmd) { case WDIOC_GETSUPPORT: ret = copy_to_user(uarg.ident, &ident, sizeof(ident)) ? -EFAULT : 0; break; case WDIOC_GETSTATUS: ret = put_user(0, uarg.i); break; case WDIOC_GETBOOTSTATUS: ret = put_user(boot_status, uarg.i); break; case WDIOC_SETOPTIONS: ret = get_user(new_options, uarg.i); if (ret) break; if (new_options & WDIOS_DISABLECARD) coh901327_disable(); if (new_options & WDIOS_ENABLECARD) coh901327_start(); ret = 0; break; case WDIOC_KEEPALIVE: coh901327_keepalive(); ret = 0; break; case WDIOC_SETTIMEOUT: ret = get_user(time, uarg.i); if (ret) break; ret = coh901327_settimeout(time); if (ret) break; /* Then fall through to return set value */ case WDIOC_GETTIMEOUT: ret = put_user(margin, uarg.i); break; case WDIOC_GETTIMELEFT: clk_enable(clk); /* Read repeatedly until the value is stable! */ val = readw(virtbase + U300_WDOG_CR); while (val & U300_WDOG_CR_VALID_IND) val = readw(virtbase + U300_WDOG_CR); val &= U300_WDOG_CR_COUNT_VALUE_MASK; clk_disable(clk); if (val != 0) val /= 100; ret = put_user(val, uarg.i); break; } return ret; } static const struct file_operations coh901327_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = coh901327_write, .unlocked_ioctl = coh901327_ioctl, .open = coh901327_open, .release = coh901327_release, }; static struct miscdevice coh901327_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &coh901327_fops, }; static int __exit coh901327_remove(struct platform_device *pdev) { misc_deregister(&coh901327_miscdev); coh901327_disable(); free_irq(irq, pdev); clk_put(clk); iounmap(virtbase); release_mem_region(phybase, physize); return 0; } static int __init coh901327_probe(struct platform_device *pdev) { int ret; u16 val; struct resource *res; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -ENOENT; parent = &pdev->dev; physize = resource_size(res); phybase = res->start; if (request_mem_region(phybase, physize, DRV_NAME) == NULL) { ret = -EBUSY; goto out; } virtbase = ioremap(phybase, physize); if (!virtbase) { ret = -ENOMEM; goto out_no_remap; } clk = clk_get(&pdev->dev, NULL); if (IS_ERR(clk)) { ret = PTR_ERR(clk); dev_err(&pdev->dev, "could not get clock\n"); goto out_no_clk; } ret = clk_enable(clk); if (ret) { dev_err(&pdev->dev, "could not enable clock\n"); goto out_no_clk_enable; } val = readw(virtbase + U300_WDOG_SR); switch (val) { case U300_WDOG_SR_STATUS_TIMED_OUT: dev_info(&pdev->dev, "watchdog timed out since last chip reset!\n"); boot_status = WDIOF_CARDRESET; /* Status will be cleared below */ break; case U300_WDOG_SR_STATUS_NORMAL: dev_info(&pdev->dev, "in normal status, no timeouts have occurred.\n"); break; default: dev_info(&pdev->dev, "contains an illegal status code (%08x)\n", val); break; } val = readw(virtbase + U300_WDOG_D2R); switch (val) { case U300_WDOG_D2R_DISABLE_STATUS_DISABLED: dev_info(&pdev->dev, "currently disabled.\n"); break; case U300_WDOG_D2R_DISABLE_STATUS_ENABLED: dev_info(&pdev->dev, "currently enabled! (disabling it now)\n"); coh901327_disable(); break; default: dev_err(&pdev->dev, "contains an illegal enable/disable code (%08x)\n", val); break; } /* Reset the watchdog */ writew(U300_WDOG_SR_RESET_STATUS_RESET, virtbase + U300_WDOG_SR); irq = platform_get_irq(pdev, 0); if (request_irq(irq, coh901327_interrupt, IRQF_DISABLED, DRV_NAME " Bark", pdev)) { ret = -EIO; goto out_no_irq; } clk_disable(clk); ret = misc_register(&coh901327_miscdev); if (ret == 0) dev_info(&pdev->dev, "initialized. timer margin=%d sec\n", margin); else goto out_no_wdog; return 0; out_no_wdog: free_irq(irq, pdev); out_no_irq: clk_disable(clk); out_no_clk_enable: clk_put(clk); out_no_clk: iounmap(virtbase); out_no_remap: release_mem_region(phybase, SZ_4K); out: return ret; } #ifdef CONFIG_PM static int coh901327_suspend(struct platform_device *pdev, pm_message_t state) { irqmaskstore = readw(virtbase + U300_WDOG_IMR) & 0x0001U; wdogenablestore = readw(virtbase + U300_WDOG_D2R); /* If watchdog is on, disable it here and now */ if (wdogenablestore == U300_WDOG_D2R_DISABLE_STATUS_ENABLED) coh901327_disable(); return 0; } static int coh901327_resume(struct platform_device *pdev) { /* Restore the watchdog interrupt */ writew(irqmaskstore, virtbase + U300_WDOG_IMR); if (wdogenablestore == U300_WDOG_D2R_DISABLE_STATUS_ENABLED) { /* Restart the watchdog timer */ writew(U300_WDOG_RR_RESTART_VALUE_RESUME, virtbase + U300_WDOG_RR); writew(U300_WDOG_FR_FEED_RESTART_TIMER, virtbase + U300_WDOG_FR); } return 0; } #else #define coh901327_suspend NULL #define coh901327_resume NULL #endif /* * Mistreating the watchdog is the only way to perform a software reset of the * system on EMP platforms. So we implement this and export a symbol for it. */ void coh901327_watchdog_reset(void) { /* Enable even if on JTAG too */ writew(U300_WDOG_JOR_JTAG_WATCHDOG_ENABLE, virtbase + U300_WDOG_JOR); /* * Timeout = 5s, we have to wait for the watchdog reset to * actually take place: the watchdog will be reloaded with the * default value immediately, so we HAVE to reboot and get back * into the kernel in 30s, or the device will reboot again! * The boot loader will typically deactivate the watchdog, so we * need time enough for the boot loader to get to the point of * deactivating the watchdog before it is shut down by it. * * NOTE: on future versions of the watchdog, this restriction is * gone: the watchdog will be reloaded with a default value (1 min) * instead of last value, and you can conveniently set the watchdog * timeout to 10ms (value = 1) without any problems. */ coh901327_enable(500); /* Return and await doom */ } static struct platform_driver coh901327_driver = { .driver = { .owner = THIS_MODULE, .name = "coh901327_wdog", }, .remove = __exit_p(coh901327_remove), .suspend = coh901327_suspend, .resume = coh901327_resume, }; static int __init coh901327_init(void) { return platform_driver_probe(&coh901327_driver, coh901327_probe); } module_init(coh901327_init); static void __exit coh901327_exit(void) { platform_driver_unregister(&coh901327_driver); } module_exit(coh901327_exit); MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); MODULE_DESCRIPTION("COH 901 327 Watchdog"); module_param(margin, int, 0); MODULE_PARM_DESC(margin, "Watchdog margin in seconds (default 60s)"); MODULE_LICENSE("GPL"); MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);