Some SoCs, like Keystone 2, can support more than one WDT and each
watchdog device has to use it's own base address, clock source,
wdd device, so add new davinci_wdt_device structure to hold device
data.
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@xxxxxx>
---
drivers/watchdog/davinci_wdt.c | 74 ++++++++++++++++++++++++++--------------
1 file changed, 48 insertions(+), 26 deletions(-)
diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c
index a6eef71..1fc2093 100644
--- a/drivers/watchdog/davinci_wdt.c
+++ b/drivers/watchdog/davinci_wdt.c
@@ -56,9 +56,18 @@
#define WDKEY_SEQ1 (0xda7e << 16)
static int heartbeat = MAX_HEARTBEAT + 1;
-static void __iomem *wdt_base;
-struct clk *wdt_clk;
-static struct watchdog_device wdt_wdd;
+
+/*
+ * struct to hold data for each WDT device
+ * @base - base io address of WD device
+ * @clk - source clock of WDT
+ * @wdd - hold watchdog device as is in WDT core
+ */
+struct davinci_wdt_device {
+ void __iomem *base;
+ struct clk *clk;
+ struct watchdog_device wdd;
+};
/* davinci_wdt_start - enable watchdog */
static int davinci_wdt_start(struct watchdog_device *wdd)
@@ -66,42 +75,45 @@ static int davinci_wdt_start(struct watchdog_device *wdd)
u32 tgcr;
u32 timer_margin;
unsigned long wdt_freq;
+ struct davinci_wdt_device *davinci_wdt = watchdog_get_drvdata(wdd);
- wdt_freq = clk_get_rate(wdt_clk);
+ wdt_freq = clk_get_rate(davinci_wdt->clk);
/* disable, internal clock source */
- iowrite32(0, wdt_base + TCR);
+ iowrite32(0, davinci_wdt->base + TCR);
/* reset timer, set mode to 64-bit watchdog, and unreset */
- iowrite32(0, wdt_base + TGCR);
+ iowrite32(0, davinci_wdt->base + TGCR);
tgcr = TIMMODE_64BIT_WDOG | TIM12RS_UNRESET | TIM34RS_UNRESET;
- iowrite32(tgcr, wdt_base + TGCR);
+ iowrite32(tgcr, davinci_wdt->base + TGCR);
/* clear counter regs */
- iowrite32(0, wdt_base + TIM12);
- iowrite32(0, wdt_base + TIM34);
+ iowrite32(0, davinci_wdt->base + TIM12);
+ iowrite32(0, davinci_wdt->base + TIM34);
/* set timeout period */
timer_margin = (((u64)wdd->timeout * wdt_freq) & 0xffffffff);
- iowrite32(timer_margin, wdt_base + PRD12);
+ iowrite32(timer_margin, davinci_wdt->base + PRD12);
timer_margin = (((u64)wdd->timeout * wdt_freq) >> 32);
- iowrite32(timer_margin, wdt_base + PRD34);
+ iowrite32(timer_margin, davinci_wdt->base + PRD34);
/* enable run continuously */
- iowrite32(ENAMODE12_PERIODIC, wdt_base + TCR);
+ iowrite32(ENAMODE12_PERIODIC, davinci_wdt->base + TCR);
/* Once the WDT is in pre-active state write to
* TIM12, TIM34, PRD12, PRD34, TCR, TGCR, WDTCR are
* write protected (except for the WDKEY field)
*/
/* put watchdog in pre-active state */
- iowrite32(WDKEY_SEQ0 | WDEN, wdt_base + WDTCR);
+ iowrite32(WDKEY_SEQ0 | WDEN, davinci_wdt->base + WDTCR);
/* put watchdog in active state */
- iowrite32(WDKEY_SEQ1 | WDEN, wdt_base + WDTCR);
+ iowrite32(WDKEY_SEQ1 | WDEN, davinci_wdt->base + WDTCR);
return 0;
}
static int davinci_wdt_ping(struct watchdog_device *wdd)
{
+ struct davinci_wdt_device *davinci_wdt = watchdog_get_drvdata(wdd);
+
/* put watchdog in service state */
- iowrite32(WDKEY_SEQ0, wdt_base + WDTCR);
+ iowrite32(WDKEY_SEQ0, davinci_wdt->base + WDTCR);
/* put watchdog in active state */
- iowrite32(WDKEY_SEQ1, wdt_base + WDTCR);
+ iowrite32(WDKEY_SEQ1, davinci_wdt->base + WDTCR);
return 0;
}
@@ -123,14 +135,21 @@ static int davinci_wdt_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct resource *wdt_mem;
struct watchdog_device *wdd;
+ struct davinci_wdt_device *davinci_wdt;
+
+ davinci_wdt = devm_kzalloc(dev, sizeof(*davinci_wdt), GFP_KERNEL);
+ if (!davinci_wdt)
+ return -ENOMEM;
- wdt_clk = devm_clk_get(dev, NULL);
- if (WARN_ON(IS_ERR(wdt_clk)))
- return PTR_ERR(wdt_clk);
+ davinci_wdt->clk = devm_clk_get(dev, NULL);
+ if (WARN_ON(IS_ERR(davinci_wdt->clk)))
+ return PTR_ERR(davinci_wdt->clk);
- clk_prepare_enable(wdt_clk);
+ clk_prepare_enable(davinci_wdt->clk);
- wdd = &wdt_wdd;
+ platform_set_drvdata(pdev, davinci_wdt);
+
+ wdd = &davinci_wdt->wdd;
wdd->info = &davinci_wdt_info;
wdd->ops = &davinci_wdt_ops;
wdd->min_timeout = 1;
@@ -142,12 +161,13 @@ static int davinci_wdt_probe(struct platform_device *pdev)
dev_info(dev, "heartbeat %d sec\n", wdd->timeout);
+ watchdog_set_drvdata(wdd, davinci_wdt);
watchdog_set_nowayout(wdd, WATCHDOG_NOWAYOUT);
wdt_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- wdt_base = devm_ioremap_resource(dev, wdt_mem);
- if (IS_ERR(wdt_base))
- return PTR_ERR(wdt_base);
+ davinci_wdt->base = devm_ioremap_resource(dev, wdt_mem);
+ if (IS_ERR(davinci_wdt->base))
+ return PTR_ERR(davinci_wdt->base);
ret = watchdog_register_device(wdd);
if (ret < 0)
@@ -158,8 +178,10 @@ static int davinci_wdt_probe(struct platform_device *pdev)
static int davinci_wdt_remove(struct platform_device *pdev)
{
- watchdog_unregister_device(&wdt_wdd);
- clk_disable_unprepare(wdt_clk);
+ struct davinci_wdt_device *davinci_wdt = platform_get_drvdata(pdev);
+
+ watchdog_unregister_device(&davinci_wdt->wdd);
+ clk_disable_unprepare(davinci_wdt->clk);
return 0;
}
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
