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authorIvan Khoronzhuk <ivan.khoronzhuk@ti.com>2013-12-04 21:39:27 +0200
committerWim Van Sebroeck <wim@iguana.be>2014-01-28 21:19:55 +0100
commit6d9a6cf5c63fe4f08b05fc53f7a17048df86d3ac (patch)
tree7219c364560d306f73ec4f54f663bca1cb4f33a4 /drivers/watchdog
parentf48f3ceabf2ce4fb5b8aa0672166e1e9001946b9 (diff)
watchdog: davinci: use davinci_wdt_device structure to hold device data
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, watchdog device, so add new davinci_wdt_device structure to hold device data. Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Guenter roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/davinci_wdt.c74
1 files changed, 48 insertions, 26 deletions
diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c
index bb8f23cd449a..6d76fcf00525 100644
--- a/drivers/watchdog/davinci_wdt.c
+++ b/drivers/watchdog/davinci_wdt.c
@@ -56,51 +56,63 @@
#define WDKEY_SEQ1 (0xda7e << 16)
static int heartbeat;
-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;
+};
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;
}
@@ -122,14 +134,21 @@ 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;
@@ -140,12 +159,13 @@ 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, 1);
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)
@@ -156,8 +176,10 @@ 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;
}