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-rw-r--r--arch/sandbox/cpu/os.c17
-rw-r--r--arch/sandbox/dts/sandbox.dtsi6
-rw-r--r--common/cyclic.c12
-rw-r--r--configs/sandbox64_defconfig2
-rw-r--r--configs/sandbox_defconfig2
-rw-r--r--doc/device-tree-bindings/watchdog/common.txt9
-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
-rw-r--r--include/cyclic.h2
-rw-r--r--include/os.h17
14 files changed, 297 insertions, 38 deletions
diff --git a/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c
index d6170adaf5..5e66304e2b 100644
--- a/arch/sandbox/cpu/os.c
+++ b/arch/sandbox/cpu/os.c
@@ -130,6 +130,23 @@ void os_exit(int exit_code)
exit(exit_code);
}
+unsigned int os_alarm(unsigned int seconds)
+{
+ return alarm(seconds);
+}
+
+void os_set_alarm_handler(void (*handler)(int))
+{
+ if (!handler)
+ handler = SIG_DFL;
+ signal(SIGALRM, handler);
+}
+
+void os_raise_sigalrm(void)
+{
+ raise(SIGALRM);
+}
+
int os_write_file(const char *fname, const void *buf, int size)
{
int fd;
diff --git a/arch/sandbox/dts/sandbox.dtsi b/arch/sandbox/dts/sandbox.dtsi
index 7387b54bbd..afe598a4f5 100644
--- a/arch/sandbox/dts/sandbox.dtsi
+++ b/arch/sandbox/dts/sandbox.dtsi
@@ -27,6 +27,12 @@
};
};
+ alarm_wdt: alarm-wdt {
+ compatible = "sandbox,alarm-wdt";
+ timeout-sec = <5>;
+ u-boot,autostart;
+ };
+
audio: audio-codec {
compatible = "sandbox,audio-codec";
#sound-dai-cells = <1>;
diff --git a/common/cyclic.c b/common/cyclic.c
index b3c180bd1a..7abb82c16a 100644
--- a/common/cyclic.c
+++ b/common/cyclic.c
@@ -85,13 +85,17 @@ void cyclic_run(void)
cyclic->cpu_time_us += cpu_time;
/* Check if cpu-time exceeds max allowed time */
- if (cpu_time > CONFIG_CYCLIC_MAX_CPU_TIME_US) {
- pr_err("cyclic function %s took too long: %lldus vs %dus max, disabling\n",
+ if ((cpu_time > CONFIG_CYCLIC_MAX_CPU_TIME_US) &&
+ (!cyclic->already_warned)) {
+ pr_err("cyclic function %s took too long: %lldus vs %dus max\n",
cyclic->name, cpu_time,
CONFIG_CYCLIC_MAX_CPU_TIME_US);
- /* Unregister this cyclic function */
- cyclic_unregister(cyclic);
+ /*
+ * Don't disable this function, just warn once
+ * about this exceeding CPU time usage
+ */
+ cyclic->already_warned = true;
}
}
}
diff --git a/configs/sandbox64_defconfig b/configs/sandbox64_defconfig
index 48a7fd2bc2..0475672968 100644
--- a/configs/sandbox64_defconfig
+++ b/configs/sandbox64_defconfig
@@ -56,6 +56,7 @@ CONFIG_CMD_REMOTEPROC=y
CONFIG_CMD_SPI=y
CONFIG_CMD_USB=y
CONFIG_CMD_CAT=y
+CONFIG_CMD_WDT=y
CONFIG_BOOTP_DNS2=y
CONFIG_CMD_TFTPPUT=y
CONFIG_CMD_TFTPSRV=y
@@ -238,6 +239,7 @@ CONFIG_SPLASH_SCREEN_ALIGN=y
CONFIG_WDT=y
CONFIG_WDT_GPIO=y
CONFIG_WDT_SANDBOX=y
+CONFIG_WDT_ALARM_SANDBOX=y
CONFIG_FS_CBFS=y
CONFIG_FS_CRAMFS=y
CONFIG_CMD_DHRYSTONE=y
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index e18e666f12..34e90674ee 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -80,6 +80,7 @@ CONFIG_CMD_REMOTEPROC=y
CONFIG_CMD_SPI=y
CONFIG_CMD_TEMPERATURE=y
CONFIG_CMD_USB=y
+CONFIG_CMD_WDT=y
CONFIG_CMD_AXI=y
CONFIG_CMD_CAT=y
CONFIG_CMD_SETEXPR_FMT=y
@@ -314,6 +315,7 @@ CONFIG_W1_EEPROM_SANDBOX=y
CONFIG_WDT=y
CONFIG_WDT_GPIO=y
CONFIG_WDT_SANDBOX=y
+CONFIG_WDT_ALARM_SANDBOX=y
CONFIG_FS_CBFS=y
CONFIG_FS_CRAMFS=y
CONFIG_ADDR_MAP=y
diff --git a/doc/device-tree-bindings/watchdog/common.txt b/doc/device-tree-bindings/watchdog/common.txt
index 9db6dd6146..d041fea234 100644
--- a/doc/device-tree-bindings/watchdog/common.txt
+++ b/doc/device-tree-bindings/watchdog/common.txt
@@ -6,7 +6,8 @@ Optional properties:
be used instead.
- hw_margin_ms : Period used to reset the watchdog in ms
If this period is not defined, the default value is 1000.
-- u-boot,noautostart : Specify that this watchdog should not autostart
- When the config option WATCHDOG_AUTOSTART is set, all enabled
- watchdogs are started. This property allows specifying that this
- watchdog should NOT be started.
+- u-boot,noautostart :
+- u-boot,autostart : These (mutually exclusive) boolean properties can be used to control
+ whether the watchdog is automatically started when probed. If neither
+ are present, the behaviour is determined by the config option
+ WATCHDOG_AUTOSTART.
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.
diff --git a/include/cyclic.h b/include/cyclic.h
index 7601636433..9c5c4fcc54 100644
--- a/include/cyclic.h
+++ b/include/cyclic.h
@@ -39,6 +39,7 @@ struct cyclic_drv {
* @run_cnt: Counter of executions occurances
* @next_call: Next time in us, when the function shall be executed again
* @list: List node
+ * @already_warned: Flag that we've warned about exceeding CPU time usage
*/
struct cyclic_info {
void (*func)(void *ctx);
@@ -50,6 +51,7 @@ struct cyclic_info {
uint64_t run_cnt;
uint64_t next_call;
struct list_head list;
+ bool already_warned;
};
/** Function type for cyclic functions */
diff --git a/include/os.h b/include/os.h
index 5b353ae9d9..54874f5e0e 100644
--- a/include/os.h
+++ b/include/os.h
@@ -109,6 +109,23 @@ int os_unlink(const char *pathname);
void os_exit(int exit_code) __attribute__((noreturn));
/**
+ * os_alarm() - access to the OS alarm() system call
+ */
+unsigned int os_alarm(unsigned int seconds);
+
+/**
+ * os_set_alarm_handler() - set handler for SIGALRM
+ *
+ * @handler: The handler function. Pass NULL for SIG_DFL.
+ */
+void os_set_alarm_handler(void (*handler)(int));
+
+/**
+ * os_raise_sigalrm() - do raise(SIGALRM)
+ */
+void os_raise_sigalrm(void);
+
+/**
* os_tty_raw() - put tty into raw mode to mimic serial console better
*
* @fd: File descriptor of stdin (normally 0)
generated by cgit v1.2.3 (git 2.39.1) at 2025-05-23 16:07:23 +0000