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authorSascha Hauer <s.hauer@pengutronix.de>2017-02-13 09:26:04 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2017-02-13 09:26:04 +0100
commit30139163b75970fcd58df6b6b987883e36571046 (patch)
tree00bd354cefa617f8474cc73994b1a72c11e770a0 /drivers/watchdog
parentbb1a6a2fd3cc41be6db1a1362f311456019317b1 (diff)
parent19df384cec181be4407f82377ffbb3059b1ed748 (diff)
downloadbarebox-30139163b75970fcd58df6b6b987883e36571046.tar.gz
Merge branch 'for-next/imx'
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/imxwd.c52
1 files changed, 37 insertions, 15 deletions
diff --git a/drivers/watchdog/imxwd.c b/drivers/watchdog/imxwd.c
index 03e116e..b920c72 100644
--- a/drivers/watchdog/imxwd.c
+++ b/drivers/watchdog/imxwd.c
@@ -25,7 +25,8 @@
struct imx_wd;
struct imx_wd_ops {
- int (*set_timeout)(struct imx_wd *, int);
+ int (*set_timeout)(struct imx_wd *, unsigned);
+ void (*soc_reset)(struct imx_wd *);
int (*init)(struct imx_wd *);
};
@@ -35,6 +36,7 @@ struct imx_wd {
struct device_d *dev;
const struct imx_wd_ops *ops;
struct restart_handler restart;
+ bool ext_reset;
};
#define to_imx_wd(h) container_of(h, struct imx_wd, wd)
@@ -50,6 +52,7 @@ struct imx_wd {
#define IMX21_WDOG_WSTR 0x04 /* Watchdog Status Register */
#define IMX21_WDOG_WMCR 0x08 /* Misc Register */
#define IMX21_WDOG_WCR_WDE (1 << 2)
+#define IMX21_WDOG_WCR_WDT (1 << 3)
#define IMX21_WDOG_WCR_SRS (1 << 4)
#define IMX21_WDOG_WCR_WDA (1 << 5)
@@ -62,7 +65,7 @@ struct imx_wd {
/* valid for i.MX27, i.MX31, always '0' on i.MX25, i.MX35, i.MX51 */
#define WSTR_COLDSTART (1 << 4)
-static int imx1_watchdog_set_timeout(struct imx_wd *priv, int timeout)
+static int imx1_watchdog_set_timeout(struct imx_wd *priv, unsigned timeout)
{
u16 val;
@@ -76,10 +79,7 @@ static int imx1_watchdog_set_timeout(struct imx_wd *priv, int timeout)
return 0;
}
- if (timeout > 0)
- val = (timeout * 2 - 1) << 8;
- else
- val = 0;
+ val = (timeout * 2 - 1) << 8;
writew(val, priv->base + IMX1_WDOG_WCR);
writew(IMX1_WDOG_WCR_WDE | val, priv->base + IMX1_WDOG_WCR);
@@ -91,25 +91,29 @@ static int imx1_watchdog_set_timeout(struct imx_wd *priv, int timeout)
return 0;
}
-static int imx21_watchdog_set_timeout(struct imx_wd *priv, int timeout)
+static void imx1_soc_reset(struct imx_wd *priv)
+{
+ writew(IMX1_WDOG_WCR_WDE, priv->base + IMX1_WDOG_WCR);
+}
+
+static int imx21_watchdog_set_timeout(struct imx_wd *priv, unsigned timeout)
{
u16 val;
dev_dbg(priv->dev, "%s: %d\n", __func__, timeout);
- if (timeout < -1 || timeout > 128)
+ if (timeout > 128)
return -EINVAL;
if (timeout == 0) /* bit 2 (WDE) cannot be set to 0 again */
return -ENOSYS;
- if (timeout > 0)
- val = ((timeout * 2 - 1) << 8) | IMX21_WDOG_WCR_SRS |
- IMX21_WDOG_WCR_WDA;
- else
- val = 0;
+ val = ((timeout * 2 - 1) << 8) | IMX21_WDOG_WCR_SRS |
+ IMX21_WDOG_WCR_WDA;
+
+ if (priv->ext_reset)
+ val |= IMX21_WDOG_WCR_WDT;
- writew(val, priv->base + IMX21_WDOG_WCR);
writew(IMX21_WDOG_WCR_WDE | val, priv->base + IMX21_WDOG_WCR);
/* Write Service Sequence */
@@ -119,6 +123,19 @@ static int imx21_watchdog_set_timeout(struct imx_wd *priv, int timeout)
return 0;
}
+static void imx21_soc_reset(struct imx_wd *priv)
+{
+ u16 val = 0;
+
+ /* Use internal reset or external - not both */
+ if (priv->ext_reset)
+ val |= IMX21_WDOG_WCR_SRS; /* do not assert int reset */
+ else
+ val |= IMX21_WDOG_WCR_WDA; /* do not assert ext-reset */
+
+ writew(val, priv->base + IMX21_WDOG_WCR);
+}
+
static int imx_watchdog_set_timeout(struct watchdog *wd, unsigned timeout)
{
struct imx_wd *priv = (struct imx_wd *)to_imx_wd(wd);
@@ -130,7 +147,7 @@ static void __noreturn imxwd_force_soc_reset(struct restart_handler *rst)
{
struct imx_wd *priv = container_of(rst, struct imx_wd, restart);
- priv->ops->set_timeout(priv, -1);
+ priv->ops->soc_reset(priv);
mdelay(1000);
@@ -194,6 +211,9 @@ static int imx_wd_probe(struct device_d *dev)
priv->wd.dev = dev;
priv->dev = dev;
+ priv->ext_reset = of_property_read_bool(dev->device_node,
+ "fsl,ext-reset-output");
+
if (IS_ENABLED(CONFIG_WATCHDOG_IMX)) {
ret = watchdog_register(&priv->wd);
if (ret)
@@ -227,11 +247,13 @@ on_error:
static const struct imx_wd_ops imx21_wd_ops = {
.set_timeout = imx21_watchdog_set_timeout,
+ .soc_reset = imx21_soc_reset,
.init = imx21_wd_init,
};
static const struct imx_wd_ops imx1_wd_ops = {
.set_timeout = imx1_watchdog_set_timeout,
+ .soc_reset = imx1_soc_reset,
};
static __maybe_unused struct of_device_id imx_wdt_dt_ids[] = {