watchdog: imx: Add DM support
Add DM and DT probing support to iMX watchdog driver. This should
allow boards to move over to this driver, enable SYSRESET_WATCHDOG
to handle cpu_reset() if required.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Peng Fan <Peng.Fan@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
Tested-by: Heiko Schocher <hs@denx.de>
diff --git a/drivers/watchdog/imx_watchdog.c b/drivers/watchdog/imx_watchdog.c
index 14cc618..53a3e9f 100644
--- a/drivers/watchdog/imx_watchdog.c
+++ b/drivers/watchdog/imx_watchdog.c
@@ -5,7 +5,9 @@
*/
#include <common.h>
+#include <dm.h>
#include <asm/io.h>
+#include <wdt.h>
#include <watchdog.h>
#include <asm/arch/imx-regs.h>
#ifdef CONFIG_FSL_LSCH2
@@ -13,20 +15,40 @@
#endif
#include <fsl_wdog.h>
-#ifdef CONFIG_IMX_WATCHDOG
-void hw_watchdog_reset(void)
+static void imx_watchdog_expire_now(struct watchdog_regs *wdog)
{
-#ifndef CONFIG_WATCHDOG_RESET_DISABLE
+ clrsetbits_le16(&wdog->wcr, WCR_WT_MSK, WCR_WDE);
+
+ writew(0x5555, &wdog->wsr);
+ writew(0xaaaa, &wdog->wsr); /* load minimum 1/2 second timeout */
+ while (1) {
+ /*
+ * spin for .5 seconds before reset
+ */
+ }
+}
+
+#if !defined(CONFIG_IMX_WATCHDOG) || \
+ (defined(CONFIG_IMX_WATCHDOG) && !CONFIG_IS_ENABLED(WDT))
+void __attribute__((weak)) reset_cpu(ulong addr)
+{
struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
+ imx_watchdog_expire_now(wdog);
+}
+#endif
+
+#if defined(CONFIG_IMX_WATCHDOG)
+static void imx_watchdog_reset(struct watchdog_regs *wdog)
+{
+#ifndef CONFIG_WATCHDOG_RESET_DISABLE
writew(0x5555, &wdog->wsr);
writew(0xaaaa, &wdog->wsr);
#endif /* CONFIG_WATCHDOG_RESET_DISABLE*/
}
-void hw_watchdog_init(void)
+static void imx_watchdog_init(struct watchdog_regs *wdog)
{
- struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
u16 timeout;
/*
@@ -44,21 +66,86 @@
writew(WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_WDT | WCR_SRS |
WCR_WDA | SET_WCR_WT(timeout), &wdog->wcr);
#endif /* CONFIG_FSL_LSCH2*/
- hw_watchdog_reset();
+ imx_watchdog_reset(wdog);
}
-#endif
-void __attribute__((weak)) reset_cpu(ulong addr)
+#if !CONFIG_IS_ENABLED(WDT)
+void hw_watchdog_reset(void)
{
struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
- clrsetbits_le16(&wdog->wcr, WCR_WT_MSK, WCR_WDE);
-
- writew(0x5555, &wdog->wsr);
- writew(0xaaaa, &wdog->wsr); /* load minimum 1/2 second timeout */
- while (1) {
- /*
- * spin for .5 seconds before reset
- */
- }
+ imx_watchdog_reset(wdog);
}
+
+void hw_watchdog_init(void)
+{
+ struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
+
+ imx_watchdog_init(wdog);
+}
+#else
+struct imx_wdt_priv {
+ void __iomem *base;
+};
+
+static int imx_wdt_reset(struct udevice *dev)
+{
+ struct imx_wdt_priv *priv = dev_get_priv(dev);
+
+ imx_watchdog_reset(priv->base);
+
+ return 0;
+}
+
+static int imx_wdt_expire_now(struct udevice *dev, ulong flags)
+{
+ struct imx_wdt_priv *priv = dev_get_priv(dev);
+
+ imx_watchdog_expire_now(priv->base);
+ hang();
+
+ return 0;
+}
+
+static int imx_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
+{
+ struct imx_wdt_priv *priv = dev_get_priv(dev);
+
+ imx_watchdog_init(priv->base);
+
+ return 0;
+}
+
+static int imx_wdt_probe(struct udevice *dev)
+{
+ struct imx_wdt_priv *priv = dev_get_priv(dev);
+
+ priv->base = dev_read_addr_ptr(dev);
+ if (!priv->base)
+ return -ENOENT;
+
+ return 0;
+}
+
+static const struct wdt_ops imx_wdt_ops = {
+ .start = imx_wdt_start,
+ .reset = imx_wdt_reset,
+ .expire_now = imx_wdt_expire_now,
+};
+
+static const struct udevice_id imx_wdt_ids[] = {
+ { .compatible = "fsl,imx21-wdt" },
+ {}
+};
+
+U_BOOT_DRIVER(imx_wdt) = {
+ .name = "imx_wdt",
+ .id = UCLASS_WDT,
+ .of_match = imx_wdt_ids,
+ .probe = imx_wdt_probe,
+ .ops = &imx_wdt_ops,
+ .priv_auto_alloc_size = sizeof(struct imx_wdt_priv),
+ .flags = DM_FLAG_PRE_RELOC,
+};
+#endif
+#endif