diff options
Diffstat (limited to 'drivers/watchdog/mpc8xxx_wdt.c')
-rw-r--r-- | drivers/watchdog/mpc8xxx_wdt.c | 156 |
1 files changed, 66 insertions, 90 deletions
diff --git a/drivers/watchdog/mpc8xxx_wdt.c b/drivers/watchdog/mpc8xxx_wdt.c index 689381a24887..5f2273aac37d 100644 --- a/drivers/watchdog/mpc8xxx_wdt.c +++ b/drivers/watchdog/mpc8xxx_wdt.c @@ -50,8 +50,12 @@ struct mpc8xxx_wdt_type { bool hw_enabled; }; -static struct mpc8xxx_wdt __iomem *wd_base; -static int mpc8xxx_wdt_init_late(void); +struct mpc8xxx_wdt_ddata { + struct mpc8xxx_wdt __iomem *base; + struct watchdog_device wdd; + struct timer_list timer; + spinlock_t lock; +}; static u16 timeout = 0xffff; module_param(timeout, ushort, 0); @@ -68,65 +72,59 @@ module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started " "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); -/* - * We always prescale, but if someone really doesn't want to they can set this - * to 0 - */ -static int prescale = 1; - -static DEFINE_SPINLOCK(wdt_spinlock); - -static void mpc8xxx_wdt_keepalive(void) +static void mpc8xxx_wdt_keepalive(struct mpc8xxx_wdt_ddata *ddata) { /* Ping the WDT */ - spin_lock(&wdt_spinlock); - out_be16(&wd_base->swsrr, 0x556c); - out_be16(&wd_base->swsrr, 0xaa39); - spin_unlock(&wdt_spinlock); + spin_lock(&ddata->lock); + out_be16(&ddata->base->swsrr, 0x556c); + out_be16(&ddata->base->swsrr, 0xaa39); + spin_unlock(&ddata->lock); } -static struct watchdog_device mpc8xxx_wdt_dev; -static void mpc8xxx_wdt_timer_ping(unsigned long arg); -static DEFINE_TIMER(wdt_timer, mpc8xxx_wdt_timer_ping, 0, - (unsigned long)&mpc8xxx_wdt_dev); - static void mpc8xxx_wdt_timer_ping(unsigned long arg) { - struct watchdog_device *w = (struct watchdog_device *)arg; + struct mpc8xxx_wdt_ddata *ddata = (void *)arg; - mpc8xxx_wdt_keepalive(); + mpc8xxx_wdt_keepalive(ddata); /* We're pinging it twice faster than needed, just to be sure. */ - mod_timer(&wdt_timer, jiffies + HZ * w->timeout / 2); + mod_timer(&ddata->timer, jiffies + HZ * ddata->wdd.timeout / 2); } static int mpc8xxx_wdt_start(struct watchdog_device *w) { - u32 tmp = SWCRR_SWEN; + struct mpc8xxx_wdt_ddata *ddata = + container_of(w, struct mpc8xxx_wdt_ddata, wdd); + + u32 tmp = SWCRR_SWEN | SWCRR_SWPR; /* Good, fire up the show */ - if (prescale) - tmp |= SWCRR_SWPR; if (reset) tmp |= SWCRR_SWRI; tmp |= timeout << 16; - out_be32(&wd_base->swcrr, tmp); + out_be32(&ddata->base->swcrr, tmp); - del_timer_sync(&wdt_timer); + del_timer_sync(&ddata->timer); return 0; } static int mpc8xxx_wdt_ping(struct watchdog_device *w) { - mpc8xxx_wdt_keepalive(); + struct mpc8xxx_wdt_ddata *ddata = + container_of(w, struct mpc8xxx_wdt_ddata, wdd); + + mpc8xxx_wdt_keepalive(ddata); return 0; } static int mpc8xxx_wdt_stop(struct watchdog_device *w) { - mod_timer(&wdt_timer, jiffies); + struct mpc8xxx_wdt_ddata *ddata = + container_of(w, struct mpc8xxx_wdt_ddata, wdd); + + mod_timer(&ddata->timer, jiffies); return 0; } @@ -143,53 +141,57 @@ static struct watchdog_ops mpc8xxx_wdt_ops = { .stop = mpc8xxx_wdt_stop, }; -static struct watchdog_device mpc8xxx_wdt_dev = { - .info = &mpc8xxx_wdt_info, - .ops = &mpc8xxx_wdt_ops, -}; - -static const struct of_device_id mpc8xxx_wdt_match[]; static int mpc8xxx_wdt_probe(struct platform_device *ofdev) { int ret; - const struct of_device_id *match; - struct device_node *np = ofdev->dev.of_node; + struct resource *res; const struct mpc8xxx_wdt_type *wdt_type; + struct mpc8xxx_wdt_ddata *ddata; u32 freq = fsl_get_sys_freq(); bool enabled; unsigned int timeout_sec; - match = of_match_device(mpc8xxx_wdt_match, &ofdev->dev); - if (!match) + wdt_type = of_device_get_match_data(&ofdev->dev); + if (!wdt_type) return -EINVAL; - wdt_type = match->data; if (!freq || freq == -1) return -EINVAL; - wd_base = of_iomap(np, 0); - if (!wd_base) + ddata = devm_kzalloc(&ofdev->dev, sizeof(*ddata), GFP_KERNEL); + if (!ddata) return -ENOMEM; - enabled = in_be32(&wd_base->swcrr) & SWCRR_SWEN; + res = platform_get_resource(ofdev, IORESOURCE_MEM, 0); + ddata->base = devm_ioremap_resource(&ofdev->dev, res); + if (IS_ERR(ddata->base)) + return PTR_ERR(ddata->base); + + enabled = in_be32(&ddata->base->swcrr) & SWCRR_SWEN; if (!enabled && wdt_type->hw_enabled) { pr_info("could not be enabled in software\n"); - ret = -ENOSYS; - goto err_unmap; + return -ENODEV; } + spin_lock_init(&ddata->lock); + setup_timer(&ddata->timer, mpc8xxx_wdt_timer_ping, + (unsigned long)ddata); + + ddata->wdd.info = &mpc8xxx_wdt_info, + ddata->wdd.ops = &mpc8xxx_wdt_ops, + /* Calculate the timeout in seconds */ - if (prescale) - timeout_sec = (timeout * wdt_type->prescaler) / freq; - else - timeout_sec = timeout / freq; - - mpc8xxx_wdt_dev.timeout = timeout_sec; -#ifdef MODULE - ret = mpc8xxx_wdt_init_late(); - if (ret) - goto err_unmap; -#endif + timeout_sec = (timeout * wdt_type->prescaler) / freq; + + ddata->wdd.timeout = timeout_sec; + + watchdog_set_nowayout(&ddata->wdd, nowayout); + + ret = watchdog_register_device(&ddata->wdd); + if (ret) { + pr_err("cannot register watchdog device (err=%d)\n", ret); + return ret; + } pr_info("WDT driver for MPC8xxx initialized. mode:%s timeout=%d (%d seconds)\n", reset ? "reset" : "interrupt", timeout, timeout_sec); @@ -200,21 +202,20 @@ static int mpc8xxx_wdt_probe(struct platform_device *ofdev) * userspace handles it. */ if (enabled) - mod_timer(&wdt_timer, jiffies); + mod_timer(&ddata->timer, jiffies); + + platform_set_drvdata(ofdev, ddata); return 0; -err_unmap: - iounmap(wd_base); - wd_base = NULL; - return ret; } static int mpc8xxx_wdt_remove(struct platform_device *ofdev) { + struct mpc8xxx_wdt_ddata *ddata = platform_get_drvdata(ofdev); + pr_crit("Watchdog removed, expect the %s soon!\n", reset ? "reset" : "machine check exception"); - del_timer_sync(&wdt_timer); - watchdog_unregister_device(&mpc8xxx_wdt_dev); - iounmap(wd_base); + del_timer_sync(&ddata->timer); + watchdog_unregister_device(&ddata->wdd); return 0; } @@ -253,31 +254,6 @@ static struct platform_driver mpc8xxx_wdt_driver = { }, }; -/* - * We do wdt initialization in two steps: arch_initcall probes the wdt - * very early to start pinging the watchdog (misc devices are not yet - * available), and later module_init() just registers the misc device. - */ -static int mpc8xxx_wdt_init_late(void) -{ - int ret; - - if (!wd_base) - return -ENODEV; - - watchdog_set_nowayout(&mpc8xxx_wdt_dev, nowayout); - - ret = watchdog_register_device(&mpc8xxx_wdt_dev); - if (ret) { - pr_err("cannot register watchdog device (err=%d)\n", ret); - return ret; - } - return 0; -} -#ifndef MODULE -module_init(mpc8xxx_wdt_init_late); -#endif - static int __init mpc8xxx_wdt_init(void) { return platform_driver_register(&mpc8xxx_wdt_driver); |