[PATCH v1 4/4] watchdog: npcm: sets card ext1 and ext2 bootstatus during probe

Tomer Maimon
2020-03-01T09:41:51Z

During probe NPCM watchdog sets the following bootstatus flags:
- WDIOF_CARDRESET represent power and core reset.
- WDIOF_EXTERN1 represent watchdog 0-2 reset.
- WDIOF_EXTERN2 represent software 1-4 reset.

Each flag is representing a group of bootstatus.
The user can configure through the device treethe exact reset
to each flag group.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
---
drivers/watchdog/npcm_wdt.c | 132 ++++++++++++++++++++++++++++++++----
1 file changed, 119 insertions(+), 13 deletions(-)

diff --git a/drivers/watchdog/npcm_wdt.c b/drivers/watchdog/npcm_wdt.c
index 8609c7acf17d..dba9a73249c9 100644
--- a/drivers/watchdog/npcm_wdt.c
+++ b/drivers/watchdog/npcm_wdt.c
@@ -11,7 +11,24 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/watchdog.h>
-
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+/* NPCM7xx GCR module */
+#define NPCM7XX_RESSR_OFFSET 0x6C
+#define NPCM7XX_INTCR2_OFFSET 0x60
+
+#define NPCM7XX_PORST BIT(31)
+#define NPCM7XX_CORST BIT(30)
+#define NPCM7XX_WD0RST BIT(29)
+#define NPCM7XX_WD1RST BIT(24)
+#define NPCM7XX_WD2RST BIT(23)
+#define NPCM7XX_SWR1RST BIT(28)
+#define NPCM7XX_SWR2RST BIT(27)
+#define NPCM7XX_SWR3RST BIT(26)
+#define NPCM7XX_SWR4RST BIT(25)
+
+ /* WD register */
#define NPCM_WTCR 0x1C

#define NPCM_WTCLK (BIT(10) | BIT(11)) /* Clock divider */
@@ -43,6 +60,9 @@
struct npcm_wdt {
struct watchdog_device wdd;
void __iomem *reg;
+ u32 card_reset;
+ u32 ext1_reset;
+ u32 ext2_reset;
};

static inline struct npcm_wdt *to_npcm_wdt(struct watchdog_device *wdd)
@@ -103,30 +123,29 @@ static int npcm_wdt_stop(struct watchdog_device *wdd)
return 0;
}

-
static int npcm_wdt_set_timeout(struct watchdog_device *wdd,
unsigned int timeout)
{
if (timeout < 2)
wdd->timeout = 1;
else if (timeout < 3)
- wdd->timeout = 2;
+ wdd->timeout = 2;
else if (timeout < 6)
- wdd->timeout = 5;
+ wdd->timeout = 5;
else if (timeout < 11)
- wdd->timeout = 10;
+ wdd->timeout = 10;
else if (timeout < 22)
- wdd->timeout = 21;
+ wdd->timeout = 21;
else if (timeout < 44)
- wdd->timeout = 43;
+ wdd->timeout = 43;
else if (timeout < 87)
- wdd->timeout = 86;
+ wdd->timeout = 86;
else if (timeout < 173)
- wdd->timeout = 172;
+ wdd->timeout = 172;
else if (timeout < 688)
- wdd->timeout = 687;
+ wdd->timeout = 687;
else
- wdd->timeout = 2750;
+ wdd->timeout = 2750;

if (watchdog_active(wdd))
npcm_wdt_start(wdd);
@@ -177,9 +196,61 @@ static const struct watchdog_ops npcm_wdt_ops = {
.restart = npcm_wdt_restart,
};

+static void npcm_get_reset_status(struct npcm_wdt *wdt, struct device *dev)
+{
+ struct regmap *gcr_regmap;
+ u32 rstval;
+
+ if (of_device_is_compatible(dev->of_node, "nuvoton,npcm750-wdt")) {
+ gcr_regmap = syscon_regmap_lookup_by_compatible("nuvoton,npcm750-gcr");
+ if (IS_ERR(gcr_regmap))
+ dev_warn(dev, "Failed to find nuvoton,npcm750-gcr WD reset status not supported\n");
+
+ regmap_read(gcr_regmap, NPCM7XX_RESSR_OFFSET, &rstval);
+ if (!rstval) {
+ regmap_read(gcr_regmap, NPCM7XX_INTCR2_OFFSET, &rstval);
+ rstval = ~rstval;
+ }
+
+ if (rstval & wdt->card_reset)
+ wdt->wdd.bootstatus |= WDIOF_CARDRESET;
+ if (rstval & wdt->ext1_reset)
+ wdt->wdd.bootstatus |= WDIOF_EXTERN1;
+ if (rstval & wdt->ext2_reset)
+ wdt->wdd.bootstatus |= WDIOF_EXTERN2;
+ }
+}
+
+static u32 npcm_wdt_reset_type(const char *reset_type)
+{
+ if (!strcmp(reset_type, "porst"))
+ return NPCM7XX_PORST;
+ else if (!strcmp(reset_type, "corst"))
+ return NPCM7XX_CORST;
+ else if (!strcmp(reset_type, "wd0"))
+ return NPCM7XX_WD0RST;
+ else if (!strcmp(reset_type, "wd1"))
+ return NPCM7XX_WD1RST;
+ else if (!strcmp(reset_type, "wd2"))
+ return NPCM7XX_WD2RST;
+ else if (!strcmp(reset_type, "sw1"))
+ return NPCM7XX_SWR1RST;
+ else if (!strcmp(reset_type, "sw2"))
+ return NPCM7XX_SWR2RST;
+ else if (!strcmp(reset_type, "sw3"))
+ return NPCM7XX_SWR3RST;
+ else if (!strcmp(reset_type, "sw4"))
+ return NPCM7XX_SWR4RST;
+
+ return 0;
+}
+
static int npcm_wdt_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ const char *card_reset_type;
+ const char *ext1_reset_type;
+ const char *ext2_reset_type;
struct npcm_wdt *wdt;
u32 priority;
int irq;
@@ -202,6 +273,39 @@ static int npcm_wdt_probe(struct platform_device *pdev)
else
watchdog_set_restart_priority(&wdt->wdd, priority);

+ ret = of_property_read_string(pdev->dev.of_node,
+ "nuvoton,card-reset-type",
+ &card_reset_type);
+ if (ret) {
+ wdt->card_reset = NPCM7XX_PORST;
+ } else {
+ wdt->card_reset = npcm_wdt_reset_type(card_reset_type);
+ if (!wdt->card_reset)
+ wdt->card_reset = NPCM7XX_PORST;
+ }
+
+ ret = of_property_read_string(pdev->dev.of_node,
+ "nuvoton,ext1-reset-type",
+ &ext1_reset_type);
+ if (ret) {
+ wdt->ext1_reset = NPCM7XX_WD0RST;
+ } else {
+ wdt->ext1_reset = npcm_wdt_reset_type(ext1_reset_type);
+ if (!wdt->ext1_reset)
+ wdt->ext1_reset = NPCM7XX_WD0RST;
+ }
+
+ ret = of_property_read_string(pdev->dev.of_node,
+ "nuvoton,ext2-reset-type",
+ &ext2_reset_type);
+ if (ret) {
+ wdt->ext2_reset = NPCM7XX_SWR1RST;
+ } else {
+ wdt->ext2_reset = npcm_wdt_reset_type(ext2_reset_type);
+ if (!wdt->ext2_reset)
+ wdt->ext2_reset = NPCM7XX_SWR1RST;
+ }
+
wdt->wdd.info = &npcm_wdt_info;
wdt->wdd.ops = &npcm_wdt_ops;
wdt->wdd.min_timeout = 1;
@@ -220,8 +324,10 @@ static int npcm_wdt_probe(struct platform_device *pdev)
set_bit(WDOG_HW_RUNNING, &wdt->wdd.status);
}

- ret = devm_request_irq(dev, irq, npcm_wdt_interrupt, 0, "watchdog",
- wdt);
+ npcm_get_reset_status(wdt, dev);
+
+ ret = devm_request_irq(dev, irq, npcm_wdt_interrupt, 0,
+ "watchdog", wdt);
if (ret)
return ret;

--
2.22.0