[PATCH] Add a simple watchdog 'framework' to Barebox

[PATCH] Add a simple watchdog 'framework' to Barebox

[Juergen Beisert]

This patch series add a very simple watchdog command and also a user of it
for the i.MX28 SoC. The watchdog driver might also work on i.MX23, but this
is not tested yed.

The following changes since commit 5d44309c3f9ab24d3f12f0d571bb94725948f0ff:

  Merge branch 'for-next/resource-size' into next (2012-06-21 20:52:03 +0200)

are available in the git repository at:

  git://git.pengutronix.de/git/jbe/barebox.git next_add_watchdog_frameworkV1

for you to fetch changes up to 4778025b3c99ca815d4902b961e62b9265cf2db5:

  ARM/MXS: add a watchdog driver for i.MX28 (2012-06-22 10:28:19 +0200)

----------------------------------------------------------------
Juergen Beisert (2):
      Add a simple watchdog framework
      ARM/MXS: add a watchdog driver for i.MX28

 drivers/Kconfig            |    1 +
 drivers/Makefile           |    1 +
 drivers/watchdog/Kconfig   |   17 +++++++
 drivers/watchdog/Makefile  |    2 +
 drivers/watchdog/im28wd.c  |  118 ++++++++++++++++++++++++++++++++++++++++++++
 drivers/watchdog/wd_core.c |   48 ++++++++++++++++++
 include/watchdog.h         |   18 +++++++
 7 files changed, 205 insertions(+)
 create mode 100644 drivers/watchdog/Kconfig
 create mode 100644 drivers/watchdog/Makefile
 create mode 100644 drivers/watchdog/im28wd.c
 create mode 100644 drivers/watchdog/wd_core.c
 create mode 100644 include/watchdog.h

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[PATCH 1/2] Add a simple watchdog framework

[Juergen Beisert]

This patch adds a simple wd command which can setup, trigger and stop a watchdog
on the platform.

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
---
 drivers/Kconfig            |    1 +
 drivers/Makefile           |    1 +
 drivers/watchdog/Kconfig   |   10 +++++++++
 drivers/watchdog/Makefile  |    1 +
 drivers/watchdog/wd_core.c |   48 ++++++++++++++++++++++++++++++++++++++++++++
 include/watchdog.h         |   18 +++++++++++++++++
 6 files changed, 79 insertions(+)
 create mode 100644 drivers/watchdog/Kconfig
 create mode 100644 drivers/watchdog/Makefile
 create mode 100644 drivers/watchdog/wd_core.c
 create mode 100644 include/watchdog.h

diff --git a/drivers/Kconfig b/drivers/Kconfig
index 037b0d4..e193063 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -18,5 +18,6 @@ source "drivers/input/Kconfig"
 
 source "drivers/pwm/Kconfig"
 source "drivers/dma/Kconfig"
+source "drivers/watchdog/Kconfig"
 
 endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index f40b321..52a44c9 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -16,3 +16,4 @@ obj-y	+= eeprom/
 obj-$(CONFIG_PWM) += pwm/
 obj-y	+= input/
 obj-y	+= dma/
+obj-y	+= watchdog/
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
new file mode 100644
index 0000000..b5970c9
--- /dev/null
+++ b/drivers/watchdog/Kconfig
@@ -0,0 +1,10 @@
+menuconfig WATCHDOG
+	bool "Watchdog support              "
+	help
+
+if WATCHDOG
+
+config WATCHDOG_CORE
+	bool
+
+endif
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
new file mode 100644
index 0000000..7a446d7
--- /dev/null
+++ b/drivers/watchdog/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_WATCHDOG_CORE) += wd_core.o
diff --git a/drivers/watchdog/wd_core.c b/drivers/watchdog/wd_core.c
new file mode 100644
index 0000000..6b88b31
--- /dev/null
+++ b/drivers/watchdog/wd_core.c
@@ -0,0 +1,48 @@
+/*
+ * (c) 2012 Juergen Beisert <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <linux/ctype.h>
+#include <watchdog.h>
+
+static unsigned timeout = 20; /* timeout in [sec] */
+
+static int do_wd(int argc, char *argv[])
+{
+	if (argc > 1) {
+		if (isdigit(*argv[1])) {
+			timeout = simple_strtoul(argv[1], NULL, 0);
+		} else {
+			printf("numerical parameter expected\n");
+			return 1;
+		}
+	}
+
+	watchdog_set_timeout(timeout);
+	return 0;
+}
+
+BAREBOX_CMD_HELP_START(wd)
+BAREBOX_CMD_HELP_USAGE("wd <seconds>\n")
+BAREBOX_CMD_HELP_SHORT("enable the watchdog to bark in <seconds> seconds. "
+		"When <seconds> is 0, the watchdog gets disabled,\n"
+		"without a parameter the watchdog will be re-triggered\n")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(wd)
+	.cmd = do_wd,
+	.usage = "enable/disable/trigger the watchdog",
+	BAREBOX_CMD_HELP(cmd_wd_help)
+BAREBOX_CMD_END
diff --git a/include/watchdog.h b/include/watchdog.h
new file mode 100644
index 0000000..d052a10
--- /dev/null
+++ b/include/watchdog.h
@@ -0,0 +1,18 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef INCLUDE_WATCHDOG_H
+# define INCLUDE_WATCHDOG_H
+
+extern int watchdog_set_timeout(unsigned);
+
+#endif /* INCLUDE_WATCHDOG_H */
-- 
1.7.10


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[PATCH 2/2] ARM/MXS: add a watchdog driver for i.MX28

[Juergen Beisert]

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
---
 drivers/watchdog/Kconfig  |    7 +++
 drivers/watchdog/Makefile |    1 +
 drivers/watchdog/im28wd.c |  118 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 126 insertions(+)
 create mode 100644 drivers/watchdog/im28wd.c

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index b5970c9..b1a73c0 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -7,4 +7,11 @@ if WATCHDOG
 config WATCHDOG_CORE
 	bool
 
+config WATCHDOG_MXS28
+	bool "i.MX28"
+	depends on ARCH_IMX28
+	select WATCHDOG_CORE
+	help
+	  Add support for watchdog management for the i.MX28 SoC.
+
 endif
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 7a446d7..b0d4d2a 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_WATCHDOG_CORE) += wd_core.o
+obj-$(CONFIG_WATCHDOG_MXS28) += im28wd.o
diff --git a/drivers/watchdog/im28wd.c b/drivers/watchdog/im28wd.c
new file mode 100644
index 0000000..13d82a2
--- /dev/null
+++ b/drivers/watchdog/im28wd.c
@@ -0,0 +1,118 @@
+/*
+ * (c) 2012 Juergen Beisert <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * Note: this driver works for the i.MX28 SoC. It might work for the
+ * i.MX23 Soc as well, but is not tested yet.
+ */
+
+#include <common.h>
+#include <init.h>
+#include <io.h>
+#include <errno.h>
+#include <malloc.h>
+
+#define MXS_RTC_CTRL 0x0
+#define MXS_RTC_SET_ADDR 0x4
+#define MXS_RTC_CLR_ADDR 0x8
+# define MXS_RTC_CTRL_WATCHDOGEN (1 << 4)
+
+#define MXS_RTC_STAT 0x10
+# define MXS_RTC_STAT_WD_PRESENT (1 << 29)
+
+#define MXS_RTC_WATCHDOG 0x50
+
+#define MXS_RTC_PERSISTENT0 0x60
+/* dubious meaning from inside the SoC's firmware ROM */
+# define MXS_RTC_PERSISTENT0_EXT_RST (1 << 21)
+/* dubious meaning from inside the SoC's firmware ROM */
+# define MXS_RTC_PERSISTENT0_THM_RST (1 << 20)
+
+#define MXS_RTC_PERSISTENT1 0x70
+/* dubious meaning from inside the SoC's firmware ROM */
+# define MXS_RTC_PERSISTENT1_FORCE_UPDATER (1 << 31)
+
+#define MXS_RTC_DEBUG 0xc0
+
+#define WDOG_TICK_RATE 1000 /* the watchdog uses a 1 kHz clock rate */
+
+struct imx28_wd {
+	void __iomem *regs;
+	u32 timeout;
+};
+
+static struct imx28_wd *wd;
+
+/* note: 'timeout' in clock ticks */
+static void imx28_wd_set_timeout(const struct imx28_wd *p, unsigned timeout)
+{
+	void __iomem *base;
+
+	if (timeout) {
+		writel(timeout, p->regs + MXS_RTC_WATCHDOG);
+		base = p->regs + MXS_RTC_SET_ADDR;
+	} else {
+		base = p->regs + MXS_RTC_CLR_ADDR;
+	}
+	writel(MXS_RTC_CTRL_WATCHDOGEN, base + MXS_RTC_CTRL);
+	writel(MXS_RTC_PERSISTENT1_FORCE_UPDATER, base + MXS_RTC_PERSISTENT1);
+}
+
+/* note: 'timeout' in [seconds] */
+int watchdog_set_timeout(unsigned timeout)
+{
+	imx28_wd_set_timeout(wd, timeout * WDOG_TICK_RATE);
+	return 0;
+}
+EXPORT_SYMBOL(watchdog_set_timeout);
+
+static int imx28_wd_probe(struct device_d *dev)
+{
+	struct imx28_wd *priv;
+
+	priv = xzalloc(sizeof(struct imx28_wd));
+	priv->regs = dev_request_mem_region(dev, 0);
+	priv->timeout = 20;
+	dev->priv = priv;
+	wd = priv;
+
+	if (!(readl(priv->regs + MXS_RTC_STAT) & MXS_RTC_STAT_WD_PRESENT)) {
+		free(priv);
+		return -ENODEV;
+	}
+
+	/* disable the debug feature to ensure a working WD */
+	writel(0x00000000, priv->regs + MXS_RTC_DEBUG);
+
+	return 0;
+}
+
+static void imx28_wd_remove(struct device_d *dev)
+{
+	struct imx28_wd *priv= dev->priv;
+	wd = NULL;
+	free(priv);
+}
+
+static struct driver_d imx28_wd_driver = {
+	.name   = "im28wd",
+	.probe  = imx28_wd_probe,
+	.remove = imx28_wd_remove,
+};
+
+static int imx28_wd_init(void)
+{
+	register_driver(&imx28_wd_driver);
+	return 0;
+}
+
+device_initcall(imx28_wd_init);
-- 
1.7.10


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[PATCH 2/2] ARM/MXS: add a watchdog driver for i.MX28

[Juergen Beisert]

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
---
 drivers/watchdog/Kconfig  |    6 +++
 drivers/watchdog/Makefile |    1 +
 drivers/watchdog/im28wd.c |  124 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 131 insertions(+)
 create mode 100644 drivers/watchdog/im28wd.c

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index c734dfe..8fdc7a5 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -6,4 +6,10 @@ menuconfig WATCHDOG
 
 if WATCHDOG
 
+config WATCHDOG_MXS28
+	bool "i.MX28"
+	depends on ARCH_IMX28
+	help
+	  Add support for watchdog management for the i.MX28 SoC.
+
 endif
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 630f1b6..b29103b 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_WATCHDOG) += wd_core.o
+obj-$(CONFIG_WATCHDOG_MXS28) += im28wd.o
diff --git a/drivers/watchdog/im28wd.c b/drivers/watchdog/im28wd.c
new file mode 100644
index 0000000..b016910
--- /dev/null
+++ b/drivers/watchdog/im28wd.c
@@ -0,0 +1,124 @@
+/*
+ * (c) 2012 Juergen Beisert <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * Note: this driver works for the i.MX28 SoC. It might work for the
+ * i.MX23 Soc as well, but is not tested yet.
+ */
+
+#include <common.h>
+#include <init.h>
+#include <io.h>
+#include <errno.h>
+#include <malloc.h>
+#include <watchdog.h>
+
+#define MXS_RTC_CTRL 0x0
+#define MXS_RTC_SET_ADDR 0x4
+#define MXS_RTC_CLR_ADDR 0x8
+# define MXS_RTC_CTRL_WATCHDOGEN (1 << 4)
+
+#define MXS_RTC_STAT 0x10
+# define MXS_RTC_STAT_WD_PRESENT (1 << 29)
+
+#define MXS_RTC_WATCHDOG 0x50
+
+#define MXS_RTC_PERSISTENT0 0x60
+/* dubious meaning from inside the SoC's firmware ROM */
+# define MXS_RTC_PERSISTENT0_EXT_RST (1 << 21)
+/* dubious meaning from inside the SoC's firmware ROM */
+# define MXS_RTC_PERSISTENT0_THM_RST (1 << 20)
+
+#define MXS_RTC_PERSISTENT1 0x70
+/* dubious meaning from inside the SoC's firmware ROM */
+# define MXS_RTC_PERSISTENT1_FORCE_UPDATER (1 << 31)
+
+#define MXS_RTC_DEBUG 0xc0
+
+#define WDOG_TICK_RATE 1000 /* the watchdog uses a 1 kHz clock rate */
+
+struct imx28_wd {
+	struct watchdog wd;
+	void __iomem *regs;
+};
+
+#define to_imx28_wd(h) container_of(h, struct imx28_wd, wd)
+
+static int imx28_watchdog_set_timeout(struct watchdog *wd, unsigned timeout)
+{
+	struct imx28_wd *pwd = (struct imx28_wd *)to_imx28_wd(wd);
+	void __iomem *base;
+
+	if (timeout > (ULONG_MAX / WDOG_TICK_RATE))
+		return -EINVAL;
+
+	if (timeout) {
+		writel(timeout * WDOG_TICK_RATE, pwd->regs + MXS_RTC_WATCHDOG);
+		base = pwd->regs + MXS_RTC_SET_ADDR;
+	} else {
+		base = pwd->regs + MXS_RTC_CLR_ADDR;
+	}
+	writel(MXS_RTC_CTRL_WATCHDOGEN, base + MXS_RTC_CTRL);
+	writel(MXS_RTC_PERSISTENT1_FORCE_UPDATER, base + MXS_RTC_PERSISTENT1);
+
+	return 0;
+}
+
+static int imx28_wd_probe(struct device_d *dev)
+{
+	struct imx28_wd *priv;
+	int rc;
+
+	priv = xzalloc(sizeof(struct imx28_wd));
+	priv->regs = dev_request_mem_region(dev, 0);
+	priv->wd.set_timeout = imx28_watchdog_set_timeout;
+
+	if (!(readl(priv->regs + MXS_RTC_STAT) & MXS_RTC_STAT_WD_PRESENT)) {
+		rc = -ENODEV;
+		goto on_error;
+	}
+
+	/* disable the debug feature to ensure a working WD */
+	writel(0x00000000, priv->regs + MXS_RTC_DEBUG);
+
+	rc = watchdog_register(&priv->wd);
+	if (rc != 0)
+		goto on_error;
+
+	dev->priv = priv;
+	return 0;
+
+on_error:
+	free(priv);
+	return rc;
+}
+
+static void imx28_wd_remove(struct device_d *dev)
+{
+	struct imx28_wd *priv= dev->priv;
+	watchdog_deregister(&priv->wd);
+	free(priv);
+}
+
+static struct driver_d imx28_wd_driver = {
+	.name   = "im28wd",
+	.probe  = imx28_wd_probe,
+	.remove = imx28_wd_remove,
+};
+
+static int imx28_wd_init(void)
+{
+	register_driver(&imx28_wd_driver);
+	return 0;
+}
+
+device_initcall(imx28_wd_init);
-- 
1.7.10


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[PATCH 2/2] ARM/MXS: add a watchdog driver for i.MX28

[Juergen Beisert]

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
---
 drivers/watchdog/Kconfig  |    7 +++
 drivers/watchdog/Makefile |    1 +
 drivers/watchdog/im28wd.c |  121 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 129 insertions(+)
 create mode 100644 drivers/watchdog/im28wd.c

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index b5970c9..b1a73c0 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -7,4 +7,11 @@ if WATCHDOG
 config WATCHDOG_CORE
 	bool
 
+config WATCHDOG_MXS28
+	bool "i.MX28"
+	depends on ARCH_IMX28
+	select WATCHDOG_CORE
+	help
+	  Add support for watchdog management for the i.MX28 SoC.
+
 endif
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 7a446d7..b0d4d2a 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_WATCHDOG_CORE) += wd_core.o
+obj-$(CONFIG_WATCHDOG_MXS28) += im28wd.o
diff --git a/drivers/watchdog/im28wd.c b/drivers/watchdog/im28wd.c
new file mode 100644
index 0000000..b1c4809
--- /dev/null
+++ b/drivers/watchdog/im28wd.c
@@ -0,0 +1,121 @@
+/*
+ * (c) 2012 Juergen Beisert <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * Note: this driver works for the i.MX28 SoC. It might work for the
+ * i.MX23 Soc as well, but is not tested yet.
+ */
+
+#include <common.h>
+#include <init.h>
+#include <io.h>
+#include <errno.h>
+#include <malloc.h>
+
+#define MXS_RTC_CTRL 0x0
+#define MXS_RTC_SET_ADDR 0x4
+#define MXS_RTC_CLR_ADDR 0x8
+# define MXS_RTC_CTRL_WATCHDOGEN (1 << 4)
+
+#define MXS_RTC_STAT 0x10
+# define MXS_RTC_STAT_WD_PRESENT (1 << 29)
+
+#define MXS_RTC_WATCHDOG 0x50
+
+#define MXS_RTC_PERSISTENT0 0x60
+/* dubious meaning from inside the SoC's firmware ROM */
+# define MXS_RTC_PERSISTENT0_EXT_RST (1 << 21)
+/* dubious meaning from inside the SoC's firmware ROM */
+# define MXS_RTC_PERSISTENT0_THM_RST (1 << 20)
+
+#define MXS_RTC_PERSISTENT1 0x70
+/* dubious meaning from inside the SoC's firmware ROM */
+# define MXS_RTC_PERSISTENT1_FORCE_UPDATER (1 << 31)
+
+#define MXS_RTC_DEBUG 0xc0
+
+#define WDOG_TICK_RATE 1000 /* the watchdog uses a 1 kHz clock rate */
+
+struct imx28_wd {
+	void __iomem *regs;
+	u32 timeout;
+};
+
+static struct imx28_wd *wd;
+
+/* note: 'timeout' in clock ticks */
+static void imx28_wd_set_timeout(const struct imx28_wd *p, unsigned timeout)
+{
+	void __iomem *base;
+
+	if (timeout) {
+		writel(timeout, p->regs + MXS_RTC_WATCHDOG);
+		base = p->regs + MXS_RTC_SET_ADDR;
+	} else {
+		base = p->regs + MXS_RTC_CLR_ADDR;
+	}
+	writel(MXS_RTC_CTRL_WATCHDOGEN, base + MXS_RTC_CTRL);
+	writel(MXS_RTC_PERSISTENT1_FORCE_UPDATER, base + MXS_RTC_PERSISTENT1);
+}
+
+/* note: 'timeout' in [seconds] */
+int watchdog_set_timeout(unsigned timeout)
+{
+	if (timeout > (ULONG_MAX / WDOG_TICK_RATE))
+		return -EINVAL;
+
+	imx28_wd_set_timeout(wd, timeout * WDOG_TICK_RATE);
+	return 0;
+}
+EXPORT_SYMBOL(watchdog_set_timeout);
+
+static int imx28_wd_probe(struct device_d *dev)
+{
+	struct imx28_wd *priv;
+
+	priv = xzalloc(sizeof(struct imx28_wd));
+	priv->regs = dev_request_mem_region(dev, 0);
+	priv->timeout = 20;
+	dev->priv = priv;
+	wd = priv;
+
+	if (!(readl(priv->regs + MXS_RTC_STAT) & MXS_RTC_STAT_WD_PRESENT)) {
+		free(priv);
+		return -ENODEV;
+	}
+
+	/* disable the debug feature to ensure a working WD */
+	writel(0x00000000, priv->regs + MXS_RTC_DEBUG);
+
+	return 0;
+}
+
+static void imx28_wd_remove(struct device_d *dev)
+{
+	struct imx28_wd *priv= dev->priv;
+	wd = NULL;
+	free(priv);
+}
+
+static struct driver_d imx28_wd_driver = {
+	.name   = "im28wd",
+	.probe  = imx28_wd_probe,
+	.remove = imx28_wd_remove,
+};
+
+static int imx28_wd_init(void)
+{
+	register_driver(&imx28_wd_driver);
+	return 0;
+}
+
+device_initcall(imx28_wd_init);
-- 
1.7.10


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[PATCH 2/2] ARM/MXS: add a watchdog driver for i.MX28

[Juergen Beisert]

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
---
 drivers/watchdog/Kconfig  |    7 +++
 drivers/watchdog/Makefile |    1 +
 drivers/watchdog/im28wd.c |  121 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 129 insertions(+)
 create mode 100644 drivers/watchdog/im28wd.c

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index b5970c9..b1a73c0 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -7,4 +7,11 @@ if WATCHDOG
 config WATCHDOG_CORE
 	bool
 
+config WATCHDOG_MXS28
+	bool "i.MX28"
+	depends on ARCH_IMX28
+	select WATCHDOG_CORE
+	help
+	  Add support for watchdog management for the i.MX28 SoC.
+
 endif
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 7a446d7..b0d4d2a 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_WATCHDOG_CORE) += wd_core.o
+obj-$(CONFIG_WATCHDOG_MXS28) += im28wd.o
diff --git a/drivers/watchdog/im28wd.c b/drivers/watchdog/im28wd.c
new file mode 100644
index 0000000..b1c4809
--- /dev/null
+++ b/drivers/watchdog/im28wd.c
@@ -0,0 +1,121 @@
+/*
+ * (c) 2012 Juergen Beisert <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * Note: this driver works for the i.MX28 SoC. It might work for the
+ * i.MX23 Soc as well, but is not tested yet.
+ */
+
+#include <common.h>
+#include <init.h>
+#include <io.h>
+#include <errno.h>
+#include <malloc.h>
+
+#define MXS_RTC_CTRL 0x0
+#define MXS_RTC_SET_ADDR 0x4
+#define MXS_RTC_CLR_ADDR 0x8
+# define MXS_RTC_CTRL_WATCHDOGEN (1 << 4)
+
+#define MXS_RTC_STAT 0x10
+# define MXS_RTC_STAT_WD_PRESENT (1 << 29)
+
+#define MXS_RTC_WATCHDOG 0x50
+
+#define MXS_RTC_PERSISTENT0 0x60
+/* dubious meaning from inside the SoC's firmware ROM */
+# define MXS_RTC_PERSISTENT0_EXT_RST (1 << 21)
+/* dubious meaning from inside the SoC's firmware ROM */
+# define MXS_RTC_PERSISTENT0_THM_RST (1 << 20)
+
+#define MXS_RTC_PERSISTENT1 0x70
+/* dubious meaning from inside the SoC's firmware ROM */
+# define MXS_RTC_PERSISTENT1_FORCE_UPDATER (1 << 31)
+
+#define MXS_RTC_DEBUG 0xc0
+
+#define WDOG_TICK_RATE 1000 /* the watchdog uses a 1 kHz clock rate */
+
+struct imx28_wd {
+	void __iomem *regs;
+	u32 timeout;
+};
+
+static struct imx28_wd *wd;
+
+/* note: 'timeout' in clock ticks */
+static void imx28_wd_set_timeout(const struct imx28_wd *p, unsigned timeout)
+{
+	void __iomem *base;
+
+	if (timeout) {
+		writel(timeout, p->regs + MXS_RTC_WATCHDOG);
+		base = p->regs + MXS_RTC_SET_ADDR;
+	} else {
+		base = p->regs + MXS_RTC_CLR_ADDR;
+	}
+	writel(MXS_RTC_CTRL_WATCHDOGEN, base + MXS_RTC_CTRL);
+	writel(MXS_RTC_PERSISTENT1_FORCE_UPDATER, base + MXS_RTC_PERSISTENT1);
+}
+
+/* note: 'timeout' in [seconds] */
+int watchdog_set_timeout(unsigned timeout)
+{
+	if (timeout > (ULONG_MAX / WDOG_TICK_RATE))
+		return -EINVAL;
+
+	imx28_wd_set_timeout(wd, timeout * WDOG_TICK_RATE);
+	return 0;
+}
+EXPORT_SYMBOL(watchdog_set_timeout);
+
+static int imx28_wd_probe(struct device_d *dev)
+{
+	struct imx28_wd *priv;
+
+	priv = xzalloc(sizeof(struct imx28_wd));
+	priv->regs = dev_request_mem_region(dev, 0);
+	priv->timeout = 20;
+	dev->priv = priv;
+	wd = priv;
+
+	if (!(readl(priv->regs + MXS_RTC_STAT) & MXS_RTC_STAT_WD_PRESENT)) {
+		free(priv);
+		return -ENODEV;
+	}
+
+	/* disable the debug feature to ensure a working WD */
+	writel(0x00000000, priv->regs + MXS_RTC_DEBUG);
+
+	return 0;
+}
+
+static void imx28_wd_remove(struct device_d *dev)
+{
+	struct imx28_wd *priv= dev->priv;
+	wd = NULL;
+	free(priv);
+}
+
+static struct driver_d imx28_wd_driver = {
+	.name   = "im28wd",
+	.probe  = imx28_wd_probe,
+	.remove = imx28_wd_remove,
+};
+
+static int imx28_wd_init(void)
+{
+	register_driver(&imx28_wd_driver);
+	return 0;
+}
+
+device_initcall(imx28_wd_init);
-- 
1.7.10


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