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-rw-r--r--drivers/watchdog/Kconfig8
-rw-r--r--drivers/watchdog/Makefile1
-rw-r--r--drivers/watchdog/npcm_wdt.c6
-rw-r--r--drivers/watchdog/sandbox_alarm-wdt.c79
-rw-r--r--drivers/watchdog/ulp_wdog.c159
-rw-r--r--drivers/watchdog/wdt-uclass.c15
6 files changed, 238 insertions, 30 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index e55deaf906..29e375e117 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -281,6 +281,14 @@ config WDT_SANDBOX
can be probed and supports all of the methods of WDT, but does not
really do anything.
+config WDT_ALARM_SANDBOX
+ bool "Enable SIGALRM-based Watchdog Timer support for Sandbox"
+ depends on SANDBOX && WDT
+ help
+ Enable support for a SIGALRM-based watchdog timer in Sandbox. This is
+ a watchdog device based on the host OS' alarm() function, which will
+ kill the sandbox with SIGALRM unless properly maintained.
+
config WDT_SBSA
bool "SBSA watchdog timer support"
depends on WDT
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 0e2f582a5f..446d961d7d 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_DESIGNWARE_WATCHDOG) += designware_wdt.o
obj-$(CONFIG_ULP_WATCHDOG) += ulp_wdog.o
obj-$(CONFIG_$(SPL_TPL_)WDT) += wdt-uclass.o
obj-$(CONFIG_WDT_SANDBOX) += sandbox_wdt.o
+obj-$(CONFIG_WDT_ALARM_SANDBOX) += sandbox_alarm-wdt.o
obj-$(CONFIG_WDT_APPLE) += apple_wdt.o
obj-$(CONFIG_WDT_ARMADA_37XX) += armada-37xx-wdt.o
obj-$(CONFIG_WDT_ASPEED) += ast_wdt.o
diff --git a/drivers/watchdog/npcm_wdt.c b/drivers/watchdog/npcm_wdt.c
index 256020f5d3..e56aa0ebe1 100644
--- a/drivers/watchdog/npcm_wdt.c
+++ b/drivers/watchdog/npcm_wdt.c
@@ -75,6 +75,11 @@ static int npcm_wdt_reset(struct udevice *dev)
return 0;
}
+static int npcm_wdt_expire_now(struct udevice *dev, ulong flags)
+{
+ return npcm_wdt_reset(dev);
+}
+
static int npcm_wdt_of_to_plat(struct udevice *dev)
{
struct npcm_wdt_priv *priv = dev_get_priv(dev);
@@ -87,6 +92,7 @@ static int npcm_wdt_of_to_plat(struct udevice *dev)
}
static const struct wdt_ops npcm_wdt_ops = {
+ .expire_now = npcm_wdt_expire_now,
.start = npcm_wdt_start,
.reset = npcm_wdt_reset,
.stop = npcm_wdt_stop,
diff --git a/drivers/watchdog/sandbox_alarm-wdt.c b/drivers/watchdog/sandbox_alarm-wdt.c
new file mode 100644
index 0000000000..71bb5d924e
--- /dev/null
+++ b/drivers/watchdog/sandbox_alarm-wdt.c
@@ -0,0 +1,79 @@
+#include <common.h>
+#include <dm.h>
+#include <os.h>
+#include <wdt.h>
+
+struct alarm_wdt_priv {
+ unsigned int timeout_sec;
+};
+
+static void alarm_handler(int sig)
+{
+ const char *msg = "!!! ALARM !!!\n";
+
+ os_write(2, msg, strlen(msg));
+ os_fd_restore();
+ os_set_alarm_handler(NULL);
+ os_raise_sigalrm();
+}
+
+static int alarm_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
+{
+ struct alarm_wdt_priv *priv = dev_get_priv(dev);
+ unsigned int sec;
+
+ timeout = DIV_ROUND_UP(timeout, 1000);
+ sec = min_t(u64, UINT_MAX, timeout);
+ priv->timeout_sec = sec;
+
+ os_alarm(0);
+ os_set_alarm_handler(alarm_handler);
+ os_alarm(sec);
+
+ return 0;
+}
+
+static int alarm_wdt_stop(struct udevice *dev)
+{
+ os_alarm(0);
+ os_set_alarm_handler(NULL);
+
+ return 0;
+}
+
+static int alarm_wdt_reset(struct udevice *dev)
+{
+ struct alarm_wdt_priv *priv = dev_get_priv(dev);
+
+ os_alarm(priv->timeout_sec);
+
+ return 0;
+}
+
+static int alarm_wdt_expire_now(struct udevice *dev, ulong flags)
+{
+ alarm_handler(0);
+
+ return 0;
+}
+
+
+static const struct wdt_ops alarm_wdt_ops = {
+ .start = alarm_wdt_start,
+ .reset = alarm_wdt_reset,
+ .stop = alarm_wdt_stop,
+ .expire_now = alarm_wdt_expire_now,
+};
+
+static const struct udevice_id alarm_wdt_ids[] = {
+ { .compatible = "sandbox,alarm-wdt" },
+ {}
+};
+
+U_BOOT_DRIVER(alarm_wdt_sandbox) = {
+ .name = "alarm_wdt_sandbox",
+ .id = UCLASS_WDT,
+ .of_match = alarm_wdt_ids,
+ .ops = &alarm_wdt_ops,
+ .priv_auto = sizeof(struct alarm_wdt_priv),
+};
diff --git a/drivers/watchdog/ulp_wdog.c b/drivers/watchdog/ulp_wdog.c
index ecd35ef22a..e081054304 100644
--- a/drivers/watchdog/ulp_wdog.c
+++ b/drivers/watchdog/ulp_wdog.c
@@ -7,6 +7,8 @@
#include <cpu_func.h>
#include <asm/io.h>
#include <asm/arch/imx-regs.h>
+#include <dm.h>
+#include <wdt.h>
/*
* MX7ULP WDOG Register Map
@@ -18,6 +20,11 @@ struct wdog_regs {
u32 win;
};
+struct ulp_wdt_priv {
+ struct wdog_regs *wdog;
+ u32 clk_rate;
+};
+
#ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
#define CONFIG_WATCHDOG_TIMEOUT_MSECS 0x1500
#endif
@@ -28,18 +35,27 @@ struct wdog_regs {
#define UNLOCK_WORD0 0xC520 /* 1st unlock word */
#define UNLOCK_WORD1 0xD928 /* 2nd unlock word */
+#define UNLOCK_WORD 0xD928C520 /* unlock word */
+#define REFRESH_WORD 0xB480A602 /* refresh word */
+
#define WDGCS_WDGE BIT(7)
#define WDGCS_WDGUPDATE BIT(5)
#define WDGCS_RCS BIT(10)
#define WDGCS_ULK BIT(11)
+#define WDOG_CS_PRES BIT(12)
+#define WDGCS_CMD32EN BIT(13)
#define WDGCS_FLG BIT(14)
+#define WDGCS_INT BIT(6)
#define WDG_BUS_CLK (0x0)
#define WDG_LPO_CLK (0x1)
#define WDG_32KHZ_CLK (0x2)
#define WDG_EXT_CLK (0x3)
+#define CLK_RATE_1KHZ 1000
+#define CLK_RATE_32KHZ 125
+
void hw_watchdog_set_timeout(u16 val)
{
/* setting timeout value */
@@ -48,60 +64,96 @@ void hw_watchdog_set_timeout(u16 val)
writel(val, &wdog->toval);
}
-void hw_watchdog_reset(void)
+void ulp_watchdog_reset(struct wdog_regs *wdog)
{
- struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE_ADDR;
-
- dmb();
- __raw_writel(REFRESH_WORD0, &wdog->cnt);
- __raw_writel(REFRESH_WORD1, &wdog->cnt);
- dmb();
+ if (readl(&wdog->cs) & WDGCS_CMD32EN) {
+ writel(REFRESH_WORD, &wdog->cnt);
+ } else {
+ dmb();
+ __raw_writel(REFRESH_WORD0, &wdog->cnt);
+ __raw_writel(REFRESH_WORD1, &wdog->cnt);
+ dmb();
+ }
}
-void hw_watchdog_init(void)
+void ulp_watchdog_init(struct wdog_regs *wdog, u16 timeout)
{
- struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE_ADDR;
-
- dmb();
- __raw_writel(UNLOCK_WORD0, &wdog->cnt);
- __raw_writel(UNLOCK_WORD1, &wdog->cnt);
- dmb();
+ u32 cmd32 = 0;
+
+ if (readl(&wdog->cs) & WDGCS_CMD32EN) {
+ writel(UNLOCK_WORD, &wdog->cnt);
+ cmd32 = WDGCS_CMD32EN;
+ } else {
+ dmb();
+ __raw_writel(UNLOCK_WORD0, &wdog->cnt);
+ __raw_writel(UNLOCK_WORD1, &wdog->cnt);
+ dmb();
+ }
/* Wait WDOG Unlock */
while (!(readl(&wdog->cs) & WDGCS_ULK))
;
- hw_watchdog_set_timeout(CONFIG_WATCHDOG_TIMEOUT_MSECS);
+ hw_watchdog_set_timeout(timeout);
writel(0, &wdog->win);
/* setting 1-kHz clock source, enable counter running, and clear interrupt */
- writel((WDGCS_WDGE | WDGCS_WDGUPDATE |(WDG_LPO_CLK << 8) | WDGCS_FLG), &wdog->cs);
+ if (IS_ENABLED(CONFIG_ARCH_IMX9))
+ writel((cmd32 | WDGCS_WDGE | WDGCS_WDGUPDATE | (WDG_LPO_CLK << 8) |
+ WDGCS_FLG | WDOG_CS_PRES | WDGCS_INT), &wdog->cs);
+ else
+ writel((cmd32 | WDGCS_WDGE | WDGCS_WDGUPDATE | (WDG_LPO_CLK << 8) |
+ WDGCS_FLG), &wdog->cs);
/* Wait WDOG reconfiguration */
while (!(readl(&wdog->cs) & WDGCS_RCS))
;
- hw_watchdog_reset();
+ ulp_watchdog_reset(wdog);
}
-void reset_cpu(void)
+void hw_watchdog_reset(void)
+{
+ struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE_ADDR;
+
+ ulp_watchdog_reset(wdog);
+}
+
+void hw_watchdog_init(void)
{
struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE_ADDR;
- dmb();
- __raw_writel(UNLOCK_WORD0, &wdog->cnt);
- __raw_writel(UNLOCK_WORD1, &wdog->cnt);
- dmb();
+ ulp_watchdog_init(wdog, CONFIG_WATCHDOG_TIMEOUT_MSECS);
+}
+
+void reset_cpu(void)
+{
+ struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE_ADDR;
+ u32 cmd32 = 0;
+
+ if (readl(&wdog->cs) & WDGCS_CMD32EN) {
+ writel(UNLOCK_WORD, &wdog->cnt);
+ cmd32 = WDGCS_CMD32EN;
+ } else {
+ dmb();
+ __raw_writel(UNLOCK_WORD0, &wdog->cnt);
+ __raw_writel(UNLOCK_WORD1, &wdog->cnt);
+ dmb();
+ }
/* Wait WDOG Unlock */
while (!(readl(&wdog->cs) & WDGCS_ULK))
;
- hw_watchdog_set_timeout(5); /* 5ms timeout */
+ hw_watchdog_set_timeout(5); /* 5ms timeout for general; 40ms timeout for imx93 */
writel(0, &wdog->win);
/* enable counter running */
- writel((WDGCS_WDGE | (WDG_LPO_CLK << 8)), &wdog->cs);
+ if (IS_ENABLED(CONFIG_ARCH_IMX9))
+ writel((cmd32 | WDGCS_WDGE | (WDG_LPO_CLK << 8) | WDOG_CS_PRES |
+ WDGCS_INT), &wdog->cs);
+ else
+ writel((cmd32 | WDGCS_WDGE | (WDG_LPO_CLK << 8)), &wdog->cs);
/* Wait WDOG reconfiguration */
while (!(readl(&wdog->cs) & WDGCS_RCS))
@@ -111,3 +163,62 @@ void reset_cpu(void)
while (1);
}
+
+static int ulp_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
+{
+ struct ulp_wdt_priv *priv = dev_get_priv(dev);
+ u64 timeout = 0;
+
+ timeout = (timeout_ms * priv->clk_rate) / 1000;
+ if (timeout > U16_MAX)
+ return -EINVAL;
+
+ ulp_watchdog_init(priv->wdog, (u16)timeout);
+
+ return 0;
+}
+
+static int ulp_wdt_reset(struct udevice *dev)
+{
+ struct ulp_wdt_priv *priv = dev_get_priv(dev);
+
+ ulp_watchdog_reset(priv->wdog);
+
+ return 0;
+}
+
+static int ulp_wdt_probe(struct udevice *dev)
+{
+ struct ulp_wdt_priv *priv = dev_get_priv(dev);
+
+ priv->wdog = dev_read_addr_ptr(dev);
+ if (!priv->wdog)
+ return -EINVAL;
+
+ priv->clk_rate = (u32)dev_get_driver_data(dev);
+ if (!priv->clk_rate)
+ return -EINVAL;
+
+ return 0;
+}
+
+static const struct wdt_ops ulp_wdt_ops = {
+ .start = ulp_wdt_start,
+ .reset = ulp_wdt_reset,
+};
+
+static const struct udevice_id ulp_wdt_ids[] = {
+ { .compatible = "fsl,imx7ulp-wdt", .data = CLK_RATE_1KHZ },
+ { .compatible = "fsl,imx8ulp-wdt", .data = CLK_RATE_1KHZ },
+ { .compatible = "fsl,imx93-wdt", .data = CLK_RATE_32KHZ },
+ {}
+};
+
+U_BOOT_DRIVER(ulp_wdt) = {
+ .name = "ulp_wdt",
+ .id = UCLASS_WDT,
+ .of_match = ulp_wdt_ids,
+ .priv_auto = sizeof(struct ulp_wdt_priv),
+ .probe = ulp_wdt_probe,
+ .ops = &ulp_wdt_ops,
+};
diff --git a/drivers/watchdog/wdt-uclass.c b/drivers/watchdog/wdt-uclass.c
index 3f342cd99f..82df0ff0be 100644
--- a/drivers/watchdog/wdt-uclass.c
+++ b/drivers/watchdog/wdt-uclass.c
@@ -37,8 +37,8 @@ struct wdt_priv {
ulong next_reset;
/* Whether watchdog_start() has been called on the device. */
bool running;
- /* No autostart */
- bool noautostart;
+ /* autostart */
+ bool autostart;
struct cyclic_info *cyclic;
};
@@ -72,7 +72,7 @@ static void init_watchdog_dev(struct udevice *dev)
dev->name);
}
- if (!IS_ENABLED(CONFIG_WATCHDOG_AUTOSTART) || priv->noautostart) {
+ if (!priv->autostart) {
printf("WDT: Not starting %s\n", dev->name);
return;
}
@@ -267,19 +267,22 @@ static int wdt_pre_probe(struct udevice *dev)
* indicated by a hw_margin_ms property.
*/
ulong reset_period = 1000;
- bool noautostart = false;
+ bool autostart = IS_ENABLED(CONFIG_WATCHDOG_AUTOSTART);
struct wdt_priv *priv;
if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
timeout = dev_read_u32_default(dev, "timeout-sec", timeout);
reset_period = dev_read_u32_default(dev, "hw_margin_ms",
4 * reset_period) / 4;
- noautostart = dev_read_bool(dev, "u-boot,noautostart");
+ if (dev_read_bool(dev, "u-boot,noautostart"))
+ autostart = false;
+ else if (dev_read_bool(dev, "u-boot,autostart"))
+ autostart = true;
}
priv = dev_get_uclass_priv(dev);
priv->timeout = timeout;
priv->reset_period = reset_period;
- priv->noautostart = noautostart;
+ priv->autostart = autostart;
/*
* Pretend this device was last reset "long" ago so the first
* watchdog_reset will actually call its ->reset method.
generated by cgit v1.2.3 (git 2.39.1) at 2025-05-28 15:16:36 +0000