[PATCH v4 10/18] watchdog: orion: Introduce an orion_watchdog device structure
Ezequiel Garcia
ezequiel.garcia at free-electrons.com
Wed Jan 22 18:05:07 EST 2014
In order to prepare to support multiple compatible-strings, this
commit adds a device structure to hold the driver's state.
Signed-off-by: Ezequiel Garcia <ezequiel.garcia at free-electrons.com>
---
drivers/watchdog/orion_wdt.c | 104 ++++++++++++++++++++++++++-----------------
1 file changed, 64 insertions(+), 40 deletions(-)
diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c
index 80f6a77..96dba41 100644
--- a/drivers/watchdog/orion_wdt.c
+++ b/drivers/watchdog/orion_wdt.c
@@ -44,45 +44,56 @@
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 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,
@@ -106,12 +117,6 @@ 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");
@@ -147,18 +152,29 @@ static void __iomem * try_rstout_ioremap(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) {
@@ -166,26 +182,30 @@ 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 = try_rstout_ioremap(pdev, res->start & INTERNAL_REGS_MASK);
- if (!wdt_rstout) {
+ dev->rstout = try_rstout_ioremap(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 */
- orion_wdt_stop(&orion_wdt);
+ orion_wdt_stop(&dev->wdt);
/* It's important to request the IRQ once the watchdog is disabled */
irq = platform_get_irq(pdev, 0);
@@ -195,37 +215,41 @@ 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[] = {
--
1.8.1.5
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