diff options
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/watchdog/orion_wdt.c | 114 |
1 files changed, 69 insertions, 45 deletions
diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c index 65aa655..9d3a5b9 100644 --- a/drivers/watchdog/orion_wdt.c +++ b/drivers/watchdog/orion_wdt.c @@ -44,55 +44,66 @@ static bool nowayout = WATCHDOG_NOWAYOUT; static int heartbeat = -1; /* module parameter (seconds) */ -static unsigned int wdt_max_duration; /* (seconds) */ -static struct clk *clk; -static unsigned int wdt_tclk; -static void __iomem *wdt_reg; -static void __iomem *wdt_rstout; + +struct orion_watchdog { + struct watchdog_device wdt; + void __iomem *reg; + void __iomem *rstout; + unsigned long clk_rate; + struct clk *clk; +}; static int orion_wdt_ping(struct watchdog_device *wdt_dev) { + struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev); /* Reload watchdog duration */ - writel(wdt_tclk * wdt_dev->timeout, wdt_reg + WDT_VAL); + writel(dev->clk_rate * wdt_dev->timeout, dev->reg + WDT_VAL); return 0; } static int orion_wdt_start(struct watchdog_device *wdt_dev) { + struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev); + /* Set watchdog duration */ - writel(wdt_tclk * wdt_dev->timeout, wdt_reg + WDT_VAL); + writel(dev->clk_rate * wdt_dev->timeout, dev->reg + WDT_VAL); /* Enable watchdog timer */ - atomic_io_modify(wdt_reg + TIMER_CTRL, WDT_EN, WDT_EN); + atomic_io_modify(dev->reg + TIMER_CTRL, WDT_EN, WDT_EN); /* Enable reset on watchdog */ - atomic_io_modify(wdt_rstout, WDT_RESET_OUT_EN, WDT_RESET_OUT_EN); + atomic_io_modify(dev->rstout, WDT_RESET_OUT_EN, WDT_RESET_OUT_EN); + return 0; } static int orion_wdt_stop(struct watchdog_device *wdt_dev) { + struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev); + /* Disable reset on watchdog */ - atomic_io_modify(wdt_rstout, WDT_RESET_OUT_EN, 0); + atomic_io_modify(dev->rstout, WDT_RESET_OUT_EN, 0); /* Disable watchdog timer */ - atomic_io_modify(wdt_reg + TIMER_CTRL, WDT_EN, 0); + atomic_io_modify(dev->reg + TIMER_CTRL, WDT_EN, 0); + return 0; } -static int orion_wdt_enabled(void) +static int orion_wdt_enabled(struct orion_watchdog *dev) { bool enabled, running; - enabled = readl(wdt_rstout) & WDT_RESET_OUT_EN; - running = readl(wdt_reg + TIMER_CTRL) & WDT_EN; + enabled = readl(dev->rstout) & WDT_RESET_OUT_EN; + running = readl(dev->reg + TIMER_CTRL) & WDT_EN; return enabled && running; } static unsigned int orion_wdt_get_timeleft(struct watchdog_device *wdt_dev) { - return readl(wdt_reg + WDT_VAL) / wdt_tclk; + struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev); + return readl(dev->reg + WDT_VAL) / dev->clk_rate; } static int orion_wdt_set_timeout(struct watchdog_device *wdt_dev, @@ -116,12 +127,6 @@ static const struct watchdog_ops orion_wdt_ops = { .get_timeleft = orion_wdt_get_timeleft, }; -static struct watchdog_device orion_wdt = { - .info = &orion_wdt_info, - .ops = &orion_wdt_ops, - .min_timeout = 1, -}; - static irqreturn_t orion_wdt_irq(int irq, void *devid) { panic("Watchdog Timeout"); @@ -157,18 +162,29 @@ static void __iomem *orion_wdt_ioremap_rstout(struct platform_device *pdev, static int orion_wdt_probe(struct platform_device *pdev) { + struct orion_watchdog *dev; + unsigned int wdt_max_duration; /* (seconds) */ struct resource *res; int ret, irq; - clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(clk)) { + dev = devm_kzalloc(&pdev->dev, sizeof(struct orion_watchdog), + GFP_KERNEL); + if (!dev) + return -ENOMEM; + + dev->wdt.info = &orion_wdt_info; + dev->wdt.ops = &orion_wdt_ops; + dev->wdt.min_timeout = 1; + + dev->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(dev->clk)) { dev_err(&pdev->dev, "Orion Watchdog missing clock\n"); - return PTR_ERR(clk); + return PTR_ERR(dev->clk); } - ret = clk_prepare_enable(clk); + ret = clk_prepare_enable(dev->clk); if (ret) return ret; - wdt_tclk = clk_get_rate(clk); + dev->clk_rate = clk_get_rate(dev->clk); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { @@ -176,24 +192,28 @@ static int orion_wdt_probe(struct platform_device *pdev) goto disable_clk; } - wdt_reg = devm_ioremap(&pdev->dev, res->start, resource_size(res)); - if (!wdt_reg) { + dev->reg = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!dev->reg) { ret = -ENOMEM; goto disable_clk; } - wdt_rstout = orion_wdt_ioremap_rstout(pdev, res->start & - INTERNAL_REGS_MASK); - if (!wdt_rstout) { + dev->rstout = orion_wdt_ioremap_rstout(pdev, res->start & + INTERNAL_REGS_MASK); + if (!dev->rstout) { ret = -ENODEV; goto disable_clk; } - wdt_max_duration = WDT_MAX_CYCLE_COUNT / wdt_tclk; + wdt_max_duration = WDT_MAX_CYCLE_COUNT / dev->clk_rate; + + dev->wdt.timeout = wdt_max_duration; + dev->wdt.max_timeout = wdt_max_duration; + watchdog_init_timeout(&dev->wdt, heartbeat, &pdev->dev); - orion_wdt.timeout = wdt_max_duration; - orion_wdt.max_timeout = wdt_max_duration; - watchdog_init_timeout(&orion_wdt, heartbeat, &pdev->dev); + platform_set_drvdata(pdev, &dev->wdt); + watchdog_set_drvdata(&dev->wdt, dev); /* * Let's make sure the watchdog is fully stopped, unless it's @@ -201,8 +221,8 @@ 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()) - orion_wdt_stop(&orion_wdt); + if (!orion_wdt_enabled(dev)) + orion_wdt_stop(&dev->wdt); /* Request the IRQ only after the watchdog is disabled */ irq = platform_get_irq(pdev, 0); @@ -212,37 +232,41 @@ static int orion_wdt_probe(struct platform_device *pdev) * watchdog, so let's make it optional. */ ret = devm_request_irq(&pdev->dev, irq, orion_wdt_irq, 0, - pdev->name, &orion_wdt); + pdev->name, dev); if (ret < 0) { dev_err(&pdev->dev, "failed to request IRQ\n"); goto disable_clk; } } - watchdog_set_nowayout(&orion_wdt, nowayout); - ret = watchdog_register_device(&orion_wdt); + watchdog_set_nowayout(&dev->wdt, nowayout); + ret = watchdog_register_device(&dev->wdt); if (ret) goto disable_clk; pr_info("Initial timeout %d sec%s\n", - orion_wdt.timeout, nowayout ? ", nowayout" : ""); + dev->wdt.timeout, nowayout ? ", nowayout" : ""); return 0; disable_clk: - clk_disable_unprepare(clk); + clk_disable_unprepare(dev->clk); return ret; } static int orion_wdt_remove(struct platform_device *pdev) { - watchdog_unregister_device(&orion_wdt); - clk_disable_unprepare(clk); + struct watchdog_device *wdt_dev = platform_get_drvdata(pdev); + struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev); + + watchdog_unregister_device(wdt_dev); + clk_disable_unprepare(dev->clk); return 0; } static void orion_wdt_shutdown(struct platform_device *pdev) { - orion_wdt_stop(&orion_wdt); + struct watchdog_device *wdt_dev = platform_get_drvdata(pdev); + orion_wdt_stop(wdt_dev); } static const struct of_device_id orion_wdt_of_match_table[] = { |