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authorMatthew McClintock <mmcclint@codeaurora.org>2016-06-29 19:50:01 +0200
committerWim Van Sebroeck <wim@iguana.be>2016-07-17 21:03:08 +0200
commitf0d9d0f4b44ae5503ea368e7f066b20f12ca1d37 (patch)
tree3d8e1071d32b3a0470457f8b8401f8c45c7ff132 /drivers/watchdog/qcom-wdt.c
parentwatchdog: qcom: update device tree bindings (diff)
downloadlinux-f0d9d0f4b44ae5503ea368e7f066b20f12ca1d37.tar.xz
linux-f0d9d0f4b44ae5503ea368e7f066b20f12ca1d37.zip
watchdog: qcom: add option for standalone watchdog not in timer block
Commit 0dfd582e026a ("watchdog: qcom: use timer devicetree binding") moved to use the watchdog as a subset timer register block. Some devices have the watchdog completely standalone with slightly different register offsets as well so let's account for the differences here. The existing "kpss-standalone" compatible string doesn't make it entirely clear exactly what the device is so rename to "kpss-wdt" to reflect watchdog timer functionality. Also update ipq4019 DTS with an SoC specific compatible. Signed-off-by: Matthew McClintock <mmcclint@codeaurora.org> Signed-off-by: Thomas Pedersen <twp@codeaurora.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog/qcom-wdt.c')
-rw-r--r--drivers/watchdog/qcom-wdt.c64
1 files changed, 48 insertions, 16 deletions
diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c
index a043fa4f60e5..111e8a7d2645 100644
--- a/drivers/watchdog/qcom-wdt.c
+++ b/drivers/watchdog/qcom-wdt.c
@@ -18,19 +18,42 @@
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/watchdog.h>
+#include <linux/of_device.h>
-#define WDT_RST 0x38
-#define WDT_EN 0x40
-#define WDT_STS 0x44
-#define WDT_BITE_TIME 0x5C
+enum wdt_reg {
+ WDT_RST,
+ WDT_EN,
+ WDT_STS,
+ WDT_BITE_TIME,
+};
+
+static const u32 reg_offset_data_apcs_tmr[] = {
+ [WDT_RST] = 0x38,
+ [WDT_EN] = 0x40,
+ [WDT_STS] = 0x44,
+ [WDT_BITE_TIME] = 0x5C,
+};
+
+static const u32 reg_offset_data_kpss[] = {
+ [WDT_RST] = 0x4,
+ [WDT_EN] = 0x8,
+ [WDT_STS] = 0xC,
+ [WDT_BITE_TIME] = 0x14,
+};
struct qcom_wdt {
struct watchdog_device wdd;
struct clk *clk;
unsigned long rate;
void __iomem *base;
+ const u32 *layout;
};
+static void __iomem *wdt_addr(struct qcom_wdt *wdt, enum wdt_reg reg)
+{
+ return wdt->base + wdt->layout[reg];
+}
+
static inline
struct qcom_wdt *to_qcom_wdt(struct watchdog_device *wdd)
{
@@ -41,10 +64,10 @@ static int qcom_wdt_start(struct watchdog_device *wdd)
{
struct qcom_wdt *wdt = to_qcom_wdt(wdd);
- writel(0, wdt->base + WDT_EN);
- writel(1, wdt->base + WDT_RST);
- writel(wdd->timeout * wdt->rate, wdt->base + WDT_BITE_TIME);
- writel(1, wdt->base + WDT_EN);
+ writel(0, wdt_addr(wdt, WDT_EN));
+ writel(1, wdt_addr(wdt, WDT_RST));
+ writel(wdd->timeout * wdt->rate, wdt_addr(wdt, WDT_BITE_TIME));
+ writel(1, wdt_addr(wdt, WDT_EN));
return 0;
}
@@ -52,7 +75,7 @@ static int qcom_wdt_stop(struct watchdog_device *wdd)
{
struct qcom_wdt *wdt = to_qcom_wdt(wdd);
- writel(0, wdt->base + WDT_EN);
+ writel(0, wdt_addr(wdt, WDT_EN));
return 0;
}
@@ -60,7 +83,7 @@ static int qcom_wdt_ping(struct watchdog_device *wdd)
{
struct qcom_wdt *wdt = to_qcom_wdt(wdd);
- writel(1, wdt->base + WDT_RST);
+ writel(1, wdt_addr(wdt, WDT_RST));
return 0;
}
@@ -83,10 +106,10 @@ static int qcom_wdt_restart(struct watchdog_device *wdd, unsigned long action,
*/
timeout = 128 * wdt->rate / 1000;
- writel(0, wdt->base + WDT_EN);
- writel(1, wdt->base + WDT_RST);
- writel(timeout, wdt->base + WDT_BITE_TIME);
- writel(1, wdt->base + WDT_EN);
+ writel(0, wdt_addr(wdt, WDT_EN));
+ writel(1, wdt_addr(wdt, WDT_RST));
+ writel(timeout, wdt_addr(wdt, WDT_BITE_TIME));
+ writel(1, wdt_addr(wdt, WDT_EN));
/*
* Actually make sure the above sequence hits hardware before sleeping.
@@ -119,9 +142,16 @@ static int qcom_wdt_probe(struct platform_device *pdev)
struct qcom_wdt *wdt;
struct resource *res;
struct device_node *np = pdev->dev.of_node;
+ const u32 *regs;
u32 percpu_offset;
int ret;
+ regs = of_device_get_match_data(&pdev->dev);
+ if (!regs) {
+ dev_err(&pdev->dev, "Unsupported QCOM WDT module\n");
+ return -ENODEV;
+ }
+
wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
if (!wdt)
return -ENOMEM;
@@ -172,6 +202,7 @@ static int qcom_wdt_probe(struct platform_device *pdev)
wdt->wdd.min_timeout = 1;
wdt->wdd.max_timeout = 0x10000000U / wdt->rate;
wdt->wdd.parent = &pdev->dev;
+ wdt->layout = regs;
if (readl(wdt->base + WDT_STS) & 1)
wdt->wdd.bootstatus = WDIOF_CARDRESET;
@@ -208,8 +239,9 @@ static int qcom_wdt_remove(struct platform_device *pdev)
}
static const struct of_device_id qcom_wdt_of_table[] = {
- { .compatible = "qcom,kpss-timer" },
- { .compatible = "qcom,scss-timer" },
+ { .compatible = "qcom,kpss-timer", .data = reg_offset_data_apcs_tmr },
+ { .compatible = "qcom,scss-timer", .data = reg_offset_data_apcs_tmr },
+ { .compatible = "qcom,kpss-wdt", .data = reg_offset_data_kpss },
{ },
};
MODULE_DEVICE_TABLE(of, qcom_wdt_of_table);