watchdog: Add watchdog timer support for the WinSystems EBC-C384

The WinSystems EBC-C384 has an onboard watchdog timer. The timeout range supported by the watchdog timer is 1 second to 255 minutes. Timeouts under 256 seconds have a 1 second granularity, while the rest have a 1 minute granularity. This driver adds watchdog timer support for this onboard watchdog timer. The timeout may be configured via the timeout module parameter. Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

watchdog: Add watchdog timer support for the WinSystems EBC-C384
The WinSystems EBC-C384 has an onboard watchdog timer. The timeout range supported by the watchdog timer is 1 second to 255 minutes. Timeouts under 256 seconds have a 1 second granularity, while the rest have a 1 minute granularity. This driver adds watchdog timer support for this onboard watchdog timer. The timeout may be configured via the timeout module parameter. Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
William Breathitt Gray · Wim Van Sebroeck
1 parent 70f3997667
Showing 4 changed files with 204 additions and 0 deletions Side-by-side Diff
MAINTAINERS
drivers/watchdog/Kconfig
drivers/watchdog/Makefile
drivers/watchdog/ebc-c384_wdt.c
@@ -11870,6 +11870,12 @@
 S:	Maintained
 F:	drivers/media/rc/winbond-cir.c
  
+WINSYSTEMS EBC-C384 WATCHDOG DRIVER
+M:	William Breathitt Gray <vilhelm.gray@gmail.com>
+L:	linux-watchdog@vger.kernel.org
+S:	Maintained
+F:	drivers/watchdog/ebc-c384_wdt.c
+
 WIMAX STACK
 M:	Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 M:	linux-wimax@intel.com
@@ -715,6 +715,15 @@
  
 	  Most people will say N.
  
+config EBC_C384_WDT
+	tristate "WinSystems EBC-C384 Watchdog Timer"
+	depends on X86
+	select WATCHDOG_CORE
+	help
+	  Enables watchdog timer support for the watchdog timer on the
+	  WinSystems EBC-C384 motherboard. The timeout may be configured via
+	  the timeout module parameter.
+
 config F71808E_WDT
 	tristate "Fintek F71808E, F71862FG, F71869, F71882FG and F71889FG Watchdog"
 	depends on X86
@@ -88,6 +88,7 @@
 obj-$(CONFIG_ADVANTECH_WDT) += advantechwdt.o
 obj-$(CONFIG_ALIM1535_WDT) += alim1535_wdt.o
 obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o
+obj-$(CONFIG_EBC_C384_WDT) += ebc-c384_wdt.o
 obj-$(CONFIG_F71808E_WDT) += f71808e_wdt.o
 obj-$(CONFIG_SP5100_TCO) += sp5100_tco.o
 obj-$(CONFIG_GEODE_WDT) += geodewdt.o
+/*
+ * Watchdog timer driver for the WinSystems EBC-C384
+ * Copyright (C) 2016 William Breathitt Gray
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * 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/device.h>
+#include <linux/dmi.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+
+#define MODULE_NAME		"ebc-c384_wdt"
+#define WATCHDOG_TIMEOUT	60
+/*
+ * The timeout value in minutes must fit in a single byte when sent to the
+ * watchdog timer; the maximum timeout possible is 15300 (255 * 60) seconds.
+ */
+#define WATCHDOG_MAX_TIMEOUT	15300
+#define BASE_ADDR		0x564
+#define ADDR_EXTENT		5
+#define CFG_ADDR		(BASE_ADDR + 1)
+#define PET_ADDR		(BASE_ADDR + 2)
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static unsigned timeout;
+module_param(timeout, uint, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default="
+	__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
+
+static int ebc_c384_wdt_start(struct watchdog_device *wdev)
+{
+	unsigned t = wdev->timeout;
+
+	/* resolution is in minutes for timeouts greater than 255 seconds */
+	if (t > 255)
+		t = DIV_ROUND_UP(t, 60);
+
+	outb(t, PET_ADDR);
+
+	return 0;
+}
+
+static int ebc_c384_wdt_stop(struct watchdog_device *wdev)
+{
+	outb(0x00, PET_ADDR);
+
+	return 0;
+}
+
+static int ebc_c384_wdt_set_timeout(struct watchdog_device *wdev, unsigned t)
+{
+	/* resolution is in minutes for timeouts greater than 255 seconds */
+	if (t > 255) {
+		/* round second resolution up to minute granularity */
+		wdev->timeout = roundup(t, 60);
+
+		/* set watchdog timer for minutes */
+		outb(0x00, CFG_ADDR);
+	} else {
+		wdev->timeout = t;
+
+		/* set watchdog timer for seconds */
+		outb(0x80, CFG_ADDR);
+	}
+
+	return 0;
+}
+
+static const struct watchdog_ops ebc_c384_wdt_ops = {
+	.start = ebc_c384_wdt_start,
+	.stop = ebc_c384_wdt_stop,
+	.set_timeout = ebc_c384_wdt_set_timeout
+};
+
+static const struct watchdog_info ebc_c384_wdt_info = {
+	.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT,
+	.identity = MODULE_NAME
+};
+
+static int __init ebc_c384_wdt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct watchdog_device *wdd;
+
+	if (!devm_request_region(dev, BASE_ADDR, ADDR_EXTENT, dev_name(dev))) {
+		dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
+			BASE_ADDR, BASE_ADDR + ADDR_EXTENT);
+		return -EBUSY;
+	}
+
+	wdd = devm_kzalloc(dev, sizeof(*wdd), GFP_KERNEL);
+	if (!wdd)
+		return -ENOMEM;
+
+	wdd->info = &ebc_c384_wdt_info;
+	wdd->ops = &ebc_c384_wdt_ops;
+	wdd->timeout = WATCHDOG_TIMEOUT;
+	wdd->min_timeout = 1;
+	wdd->max_timeout = WATCHDOG_MAX_TIMEOUT;
+
+	watchdog_set_nowayout(wdd, nowayout);
+
+	if (watchdog_init_timeout(wdd, timeout, dev))
+		dev_warn(dev, "Invalid timeout (%u seconds), using default (%u seconds)\n",
+			timeout, WATCHDOG_TIMEOUT);
+
+	platform_set_drvdata(pdev, wdd);
+
+	return watchdog_register_device(wdd);
+}
+
+static int ebc_c384_wdt_remove(struct platform_device *pdev)
+{
+	struct watchdog_device *wdd = platform_get_drvdata(pdev);
+
+	watchdog_unregister_device(wdd);
+
+	return 0;
+}
+
+static struct platform_driver ebc_c384_wdt_driver = {
+	.driver = {
+		.name = MODULE_NAME
+	},
+	.remove = ebc_c384_wdt_remove
+};
+
+static struct platform_device *ebc_c384_wdt_device;
+
+static int __init ebc_c384_wdt_init(void)
+{
+	int err;
+
+	if (!dmi_match(DMI_BOARD_NAME, "EBC-C384 SBC"))
+		return -ENODEV;
+
+	ebc_c384_wdt_device = platform_device_alloc(MODULE_NAME, -1);
+	if (!ebc_c384_wdt_device)
+		return -ENOMEM;
+
+	err = platform_device_add(ebc_c384_wdt_device);
+	if (err)
+		goto err_platform_device;
+
+	err = platform_driver_probe(&ebc_c384_wdt_driver, ebc_c384_wdt_probe);
+	if (err)
+		goto err_platform_driver;
+
+	return 0;
+
+err_platform_driver:
+	platform_device_del(ebc_c384_wdt_device);
+err_platform_device:
+	platform_device_put(ebc_c384_wdt_device);
+	return err;
+}
+
+static void __exit ebc_c384_wdt_exit(void)
+{
+	platform_device_unregister(ebc_c384_wdt_device);
+	platform_driver_unregister(&ebc_c384_wdt_driver);
+}
+
+module_init(ebc_c384_wdt_init);
+module_exit(ebc_c384_wdt_exit);
+
+MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
+MODULE_DESCRIPTION("WinSystems EBC-C384 watchdog timer driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" MODULE_NAME);
...	...	@@ -11870,6 +11870,12 @@
11870	11870	S: Maintained
11871	11871	F: drivers/media/rc/winbond-cir.c
11872	11872
	11873	+WINSYSTEMS EBC-C384 WATCHDOG DRIVER
	11874	+M: William Breathitt Gray <vilhelm.gray@gmail.com>
	11875	+L: linux-watchdog@vger.kernel.org
	11876	+S: Maintained
	11877	+F: drivers/watchdog/ebc-c384_wdt.c
	11878	+
11873	11879	WIMAX STACK
11874	11880	M: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
11875	11881	M: linux-wimax@intel.com
...	...	@@ -715,6 +715,15 @@
715	715
716	716	Most people will say N.
717	717
	718	+config EBC_C384_WDT
	719	+ tristate "WinSystems EBC-C384 Watchdog Timer"
	720	+ depends on X86
	721	+ select WATCHDOG_CORE
	722	+ help
	723	+ Enables watchdog timer support for the watchdog timer on the
	724	+ WinSystems EBC-C384 motherboard. The timeout may be configured via
	725	+ the timeout module parameter.
	726	+
718	727	config F71808E_WDT
719	728	tristate "Fintek F71808E, F71862FG, F71869, F71882FG and F71889FG Watchdog"
720	729	depends on X86
...	...	@@ -88,6 +88,7 @@
88	88	obj-$(CONFIG_ADVANTECH_WDT) += advantechwdt.o
89	89	obj-$(CONFIG_ALIM1535_WDT) += alim1535_wdt.o
90	90	obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o
	91	+obj-$(CONFIG_EBC_C384_WDT) += ebc-c384_wdt.o
91	92	obj-$(CONFIG_F71808E_WDT) += f71808e_wdt.o
92	93	obj-$(CONFIG_SP5100_TCO) += sp5100_tco.o
93	94	obj-$(CONFIG_GEODE_WDT) += geodewdt.o
	1	+/*
	2	+ * Watchdog timer driver for the WinSystems EBC-C384
	3	+ * Copyright (C) 2016 William Breathitt Gray
	4	+ *
	5	+ * This program is free software; you can redistribute it and/or modify
	6	+ * it under the terms of the GNU General Public License, version 2, as
	7	+ * published by the Free Software Foundation.
	8	+ *
	9	+ * This program is distributed in the hope that it will be useful, but
	10	+ * WITHOUT ANY WARRANTY; without even the implied warranty of
	11	+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	12	+ * General Public License for more details.
	13	+ */
	14	+#include <linux/device.h>
	15	+#include <linux/dmi.h>
	16	+#include <linux/errno.h>
	17	+#include <linux/io.h>
	18	+#include <linux/ioport.h>
	19	+#include <linux/kernel.h>
	20	+#include <linux/module.h>
	21	+#include <linux/moduleparam.h>
	22	+#include <linux/platform_device.h>
	23	+#include <linux/types.h>
	24	+#include <linux/watchdog.h>
	25	+
	26	+#define MODULE_NAME "ebc-c384_wdt"
	27	+#define WATCHDOG_TIMEOUT 60
	28	+/*
	29	+ * The timeout value in minutes must fit in a single byte when sent to the
	30	+ * watchdog timer; the maximum timeout possible is 15300 (255 * 60) seconds.
	31	+ */
	32	+#define WATCHDOG_MAX_TIMEOUT 15300
	33	+#define BASE_ADDR 0x564
	34	+#define ADDR_EXTENT 5
	35	+#define CFG_ADDR (BASE_ADDR + 1)
	36	+#define PET_ADDR (BASE_ADDR + 2)
	37	+
	38	+static bool nowayout = WATCHDOG_NOWAYOUT;
	39	+module_param(nowayout, bool, 0);
	40	+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
	41	+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
	42	+
	43	+static unsigned timeout;
	44	+module_param(timeout, uint, 0);
	45	+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default="
	46	+ __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
	47	+
	48	+static int ebc_c384_wdt_start(struct watchdog_device *wdev)
	49	+{
	50	+ unsigned t = wdev->timeout;
	51	+
	52	+ /* resolution is in minutes for timeouts greater than 255 seconds */
	53	+ if (t > 255)
	54	+ t = DIV_ROUND_UP(t, 60);
	55	+
	56	+ outb(t, PET_ADDR);
	57	+
	58	+ return 0;
	59	+}
	60	+
	61	+static int ebc_c384_wdt_stop(struct watchdog_device *wdev)
	62	+{
	63	+ outb(0x00, PET_ADDR);
	64	+
	65	+ return 0;
	66	+}
	67	+
	68	+static int ebc_c384_wdt_set_timeout(struct watchdog_device *wdev, unsigned t)
	69	+{
	70	+ /* resolution is in minutes for timeouts greater than 255 seconds */
	71	+ if (t > 255) {
	72	+ /* round second resolution up to minute granularity */
	73	+ wdev->timeout = roundup(t, 60);
	74	+
	75	+ /* set watchdog timer for minutes */
	76	+ outb(0x00, CFG_ADDR);
	77	+ } else {
	78	+ wdev->timeout = t;
	79	+
	80	+ /* set watchdog timer for seconds */
	81	+ outb(0x80, CFG_ADDR);
	82	+ }
	83	+
	84	+ return 0;
	85	+}
	86	+
	87	+static const struct watchdog_ops ebc_c384_wdt_ops = {
	88	+ .start = ebc_c384_wdt_start,
	89	+ .stop = ebc_c384_wdt_stop,
	90	+ .set_timeout = ebc_c384_wdt_set_timeout
	91	+};
	92	+
	93	+static const struct watchdog_info ebc_c384_wdt_info = {
	94	+ .options = WDIOF_KEEPALIVEPING \| WDIOF_MAGICCLOSE \| WDIOF_SETTIMEOUT,
	95	+ .identity = MODULE_NAME
	96	+};
	97	+
	98	+static int __init ebc_c384_wdt_probe(struct platform_device *pdev)
	99	+{
	100	+ struct device *dev = &pdev->dev;
	101	+ struct watchdog_device *wdd;
	102	+
	103	+ if (!devm_request_region(dev, BASE_ADDR, ADDR_EXTENT, dev_name(dev))) {
	104	+ dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
	105	+ BASE_ADDR, BASE_ADDR + ADDR_EXTENT);
	106	+ return -EBUSY;
	107	+ }
	108	+
	109	+ wdd = devm_kzalloc(dev, sizeof(*wdd), GFP_KERNEL);
	110	+ if (!wdd)
	111	+ return -ENOMEM;
	112	+
	113	+ wdd->info = &ebc_c384_wdt_info;
	114	+ wdd->ops = &ebc_c384_wdt_ops;
	115	+ wdd->timeout = WATCHDOG_TIMEOUT;
	116	+ wdd->min_timeout = 1;
	117	+ wdd->max_timeout = WATCHDOG_MAX_TIMEOUT;
	118	+
	119	+ watchdog_set_nowayout(wdd, nowayout);
	120	+
	121	+ if (watchdog_init_timeout(wdd, timeout, dev))
	122	+ dev_warn(dev, "Invalid timeout (%u seconds), using default (%u seconds)\n",
	123	+ timeout, WATCHDOG_TIMEOUT);
	124	+
	125	+ platform_set_drvdata(pdev, wdd);
	126	+
	127	+ return watchdog_register_device(wdd);
	128	+}
	129	+
	130	+static int ebc_c384_wdt_remove(struct platform_device *pdev)
	131	+{
	132	+ struct watchdog_device *wdd = platform_get_drvdata(pdev);
	133	+
	134	+ watchdog_unregister_device(wdd);
	135	+
	136	+ return 0;
	137	+}
	138	+
	139	+static struct platform_driver ebc_c384_wdt_driver = {
	140	+ .driver = {
	141	+ .name = MODULE_NAME
	142	+ },
	143	+ .remove = ebc_c384_wdt_remove
	144	+};
	145	+
	146	+static struct platform_device *ebc_c384_wdt_device;
	147	+
	148	+static int __init ebc_c384_wdt_init(void)
	149	+{
	150	+ int err;
	151	+
	152	+ if (!dmi_match(DMI_BOARD_NAME, "EBC-C384 SBC"))
	153	+ return -ENODEV;
	154	+
	155	+ ebc_c384_wdt_device = platform_device_alloc(MODULE_NAME, -1);
	156	+ if (!ebc_c384_wdt_device)
	157	+ return -ENOMEM;
	158	+
	159	+ err = platform_device_add(ebc_c384_wdt_device);
	160	+ if (err)
	161	+ goto err_platform_device;
	162	+
	163	+ err = platform_driver_probe(&ebc_c384_wdt_driver, ebc_c384_wdt_probe);
	164	+ if (err)
	165	+ goto err_platform_driver;
	166	+
	167	+ return 0;
	168	+
	169	+err_platform_driver:
	170	+ platform_device_del(ebc_c384_wdt_device);
	171	+err_platform_device:
	172	+ platform_device_put(ebc_c384_wdt_device);
	173	+ return err;
	174	+}
	175	+
	176	+static void __exit ebc_c384_wdt_exit(void)
	177	+{
	178	+ platform_device_unregister(ebc_c384_wdt_device);
	179	+ platform_driver_unregister(&ebc_c384_wdt_driver);
	180	+}
	181	+
	182	+module_init(ebc_c384_wdt_init);
	183	+module_exit(ebc_c384_wdt_exit);
	184	+
	185	+MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
	186	+MODULE_DESCRIPTION("WinSystems EBC-C384 watchdog timer driver");
	187	+MODULE_LICENSE("GPL v2");
	188	+MODULE_ALIAS("platform:" MODULE_NAME);