[PATCH 3/3] watchdog: Add Congatec CGEB watchdog driver

[Sascha Hauer]

This driver provides support for the CGEB watchdog found on some
Congatec x86 modules.

Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
 drivers/watchdog/Kconfig                  |   10 ++
 drivers/watchdog/Makefile                 |    1 +
 drivers/watchdog/congatec_cgeb_watchdog.c |  161 +++++++++++++++++++++++++++++
 3 files changed, 172 insertions(+)
 create mode 100644 drivers/watchdog/congatec_cgeb_watchdog.c

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 7f809fd..47138fb 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -934,6 +934,16 @@ config SBC_EPX_C3_WATCHDOG
 	  To compile this driver as a module, choose M here: the
 	  module will be called sbc_epx_c3.
 
+config CONGATEC_CGEB_WATCHDOG
+	depends on CONGATEC_CGEB
+	tristate "Congatec CGEB watchdog"
+	---help---
+	  This driver provides support for the watchdogs found on Congatec
+	  modules with the CGEB BIOS interface.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called congatec_cgeb_wdt.
+
 # M32R Architecture
 
 # M68K Architecture
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 97bbdb3a..e67eee5 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -108,6 +108,7 @@ obj-$(CONFIG_W83977F_WDT) += w83977f_wdt.o
 obj-$(CONFIG_MACHZ_WDT) += machzwd.o
 obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o
 obj-$(CONFIG_INTEL_SCU_WATCHDOG) += intel_scu_watchdog.o
+obj-$(CONFIG_CONGATEC_CGEB_WATCHDOG) += congatec_cgeb_watchdog.o
 
 # M32R Architecture
 
diff --git a/drivers/watchdog/congatec_cgeb_watchdog.c b/drivers/watchdog/congatec_cgeb_watchdog.c
new file mode 100644
index 0000000..b7b6cf5
--- /dev/null
+++ b/drivers/watchdog/congatec_cgeb_watchdog.c
@@ -0,0 +1,161 @@
+/*
+ * CGEB watchdog driver
+ *
+ * (c) 2011 Sascha Hauer, Pengutronix
+ *
+ * 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; version 2 of the License.
+ *
+ * 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 <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+#include <asm/congatec-cgeb.h>
+
+#define CGOS_WDOG_MODE_REBOOT_PC    0
+#define CGOS_WDOG_MODE_RESTART_OS   1
+#define CGOS_WDOG_MODE_STAGED    0x80
+
+#define CGOS_WDOG_OPMODE_DISABLED      0
+#define CGOS_WDOG_OPMODE_ONETIME_TRIG  1
+#define CGOS_WDOG_OPMODE_SINGLE_EVENT  2
+#define CGOS_WDOG_OPMODE_EVENT_REPEAT  3
+
+#define CGOS_WDOG_EVENT_INT 0	/* NMI/IRQ */
+#define CGOS_WDOG_EVENT_SCI 1	/* SMI/SCI */
+#define CGOS_WDOG_EVENT_RST 2	/* system reset */
+#define CGOS_WDOG_EVENT_BTN 3	/* power button */
+
+#define CGOS_WDOG_EVENT_MAX_STAGES 3
+
+struct cgeb_watchdog_stage {
+	unsigned long timeout;
+	unsigned long event;
+};
+
+struct cgeb_watchdog_config {
+	unsigned long size;
+	unsigned long timeout; /* not used in staged mode */
+	unsigned long delay;
+	unsigned long mode;
+	/* optional parameters for staged watchdog */
+	unsigned long op_mode;
+	unsigned long stage_count;
+	struct cgeb_watchdog_stage stages[CGOS_WDOG_EVENT_MAX_STAGES];
+};
+
+struct cgeb_watchdog_priv {
+	struct cgeb_board_data	*board;
+	struct watchdog_device	wdd;
+	int unit;
+};
+
+static struct watchdog_info cgeb_wdd_info = {
+	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+	.firmware_version = 0,
+	.identity = "cgeb watchdog",
+};
+
+static unsigned int watchdog_set_config(struct cgeb_watchdog_priv *priv,
+		unsigned int timeout_s)
+{
+	struct cgeb_board_data *board = priv->board;
+	struct cgeb_watchdog_config wdi;
+	struct cgeb_function_parameters fps;
+
+	memset(&wdi, 0, sizeof(wdi));
+	memset(&fps, 0, sizeof(fps));
+
+	fps.unit = priv->unit;
+	fps.iptr = &wdi;
+
+	wdi.timeout = timeout_s * 1000;
+	wdi.delay = 0;
+	wdi.size = sizeof(wdi);
+	wdi.mode = CGOS_WDOG_MODE_REBOOT_PC;
+
+	return cgeb_call(board, &fps, CgebWDogSetConfig);
+}
+
+static int cgeb_watchdog_start(struct watchdog_device *wdd)
+{
+	struct cgeb_watchdog_priv *priv = watchdog_get_drvdata(wdd);
+
+	return watchdog_set_config(priv, wdd->timeout);
+}
+
+static int cgeb_watchdog_stop(struct watchdog_device *wdd)
+{
+	struct cgeb_watchdog_priv *priv = watchdog_get_drvdata(wdd);
+
+	return watchdog_set_config(priv, 0);
+}
+
+static int cgeb_watchdog_set_timeout(struct watchdog_device *wdd,
+		unsigned int timeout_s)
+{
+	return 0;
+}
+
+struct watchdog_ops cgeb_watchdog_ops = {
+	.start = cgeb_watchdog_start,
+	.stop = cgeb_watchdog_stop,
+	.set_timeout = cgeb_watchdog_set_timeout,
+};
+
+static int cgeb_watchdog_probe(struct platform_device *pdev)
+{
+	struct cgeb_watchdog_priv *priv;
+	struct cgeb_pdata *pdata = pdev->dev.platform_data;
+	int ret;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->wdd.ops = &cgeb_watchdog_ops;
+	priv->wdd.info = &cgeb_wdd_info;
+	priv->wdd.min_timeout = 1;
+	priv->wdd.max_timeout = 3600;
+	priv->board = pdata->board;
+	priv->unit = pdata->unit;
+
+	watchdog_set_drvdata(&priv->wdd, priv);
+	platform_set_drvdata(pdev, priv);
+
+	ret = watchdog_register_device(&priv->wdd);
+	if (ret)
+		return ret;
+
+	dev_info(&pdev->dev, "registered\n");
+
+	return 0;
+}
+
+static int cgeb_watchdog_remove(struct platform_device *pdev)
+{
+	struct cgeb_watchdog_priv *priv = platform_get_drvdata(pdev);
+
+	watchdog_unregister_device(&priv->wdd);
+
+	return 0;
+}
+
+static struct platform_driver cgeb_watchdog_driver = {
+	.probe		= cgeb_watchdog_probe,
+	.remove		= cgeb_watchdog_remove,
+	.driver	= {
+		.name	= "cgeb-watchdog",
+		.owner	= THIS_MODULE,
+	},
+};
+module_platform_driver(cgeb_watchdog_driver);
+
+MODULE_AUTHOR("Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("cgeb watchdog driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.10.4

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