[linux-2.6-block.git] / drivers / watchdog / bcm_kona_wdt.c

/*
 * Copyright (C) 2013 Broadcom Corporation
 *
 * 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.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/watchdog.h>

#define SECWDOG_CTRL_REG		0x00000000
#define SECWDOG_COUNT_REG		0x00000004

#define SECWDOG_RESERVED_MASK		0x1dffffff
#define SECWDOG_WD_LOAD_FLAG		0x10000000
#define SECWDOG_EN_MASK			0x08000000
#define SECWDOG_SRSTEN_MASK		0x04000000
#define SECWDOG_RES_MASK		0x00f00000
#define SECWDOG_COUNT_MASK		0x000fffff

#define SECWDOG_MAX_COUNT		SECWDOG_COUNT_MASK
#define SECWDOG_CLKS_SHIFT		20
#define SECWDOG_MAX_RES			15
#define SECWDOG_DEFAULT_RESOLUTION	4
#define SECWDOG_MAX_TRY			1000

#define SECS_TO_TICKS(x, w)		((x) << (w)->resolution)
#define TICKS_TO_SECS(x, w)		((x) >> (w)->resolution)

#define BCM_KONA_WDT_NAME		"bcm_kona_wdt"

struct bcm_kona_wdt {
	void __iomem *base;
	/*
	 * One watchdog tick is 1/(2^resolution) seconds. Resolution can take
	 * the values 0-15, meaning one tick can be 1s to 30.52us. Our default
	 * resolution of 4 means one tick is 62.5ms.
	 *
	 * The watchdog counter is 20 bits. Depending on resolution, the maximum
	 * counter value of 0xfffff expires after about 12 days (resolution 0)
	 * down to only 32s (resolution 15). The default resolution of 4 gives
	 * us a maximum of about 18 hours and 12 minutes before the watchdog
	 * times out.
	 */
	int resolution;
	spinlock_t lock;
#ifdef CONFIG_BCM_KONA_WDT_DEBUG
	unsigned long busy_count;
	struct dentry *debugfs;
#endif
};

static int secure_register_read(struct bcm_kona_wdt *wdt, uint32_t offset)
{
	uint32_t val;
	unsigned count = 0;

	/*
	 * If the WD_LOAD_FLAG is set, the watchdog counter field is being
	 * updated in hardware. Once the WD timer is updated in hardware, it
	 * gets cleared.
	 */
	do {
		if (unlikely(count > 1))
			udelay(5);
		val = readl_relaxed(wdt->base + offset);
		count++;
	} while ((val & SECWDOG_WD_LOAD_FLAG) && count < SECWDOG_MAX_TRY);

#ifdef CONFIG_BCM_KONA_WDT_DEBUG
	/* Remember the maximum number iterations due to WD_LOAD_FLAG */
	if (count > wdt->busy_count)
		wdt->busy_count = count;
#endif

	/* This is the only place we return a negative value. */
	if (val & SECWDOG_WD_LOAD_FLAG)
		return -ETIMEDOUT;

	/* We always mask out reserved bits. */
	val &= SECWDOG_RESERVED_MASK;

	return val;
}

#ifdef CONFIG_BCM_KONA_WDT_DEBUG

static int bcm_kona_wdt_dbg_show(struct seq_file *s, void *data)
{
	int ctl_val, cur_val, ret;
	unsigned long flags;
	struct bcm_kona_wdt *wdt = s->private;

	if (!wdt)
		return seq_puts(s, "No device pointer\n");

	spin_lock_irqsave(&wdt->lock, flags);
	ctl_val = secure_register_read(wdt, SECWDOG_CTRL_REG);
	cur_val = secure_register_read(wdt, SECWDOG_COUNT_REG);
	spin_unlock_irqrestore(&wdt->lock, flags);

	if (ctl_val < 0 || cur_val < 0) {
		ret = seq_puts(s, "Error accessing hardware\n");
	} else {
		int ctl, cur, ctl_sec, cur_sec, res;

		ctl = ctl_val & SECWDOG_COUNT_MASK;
		res = (ctl_val & SECWDOG_RES_MASK) >> SECWDOG_CLKS_SHIFT;
		cur = cur_val & SECWDOG_COUNT_MASK;
		ctl_sec = TICKS_TO_SECS(ctl, wdt);
		cur_sec = TICKS_TO_SECS(cur, wdt);
		ret = seq_printf(s, "Resolution: %d / %d\n"
				"Control: %d s / %d (%#x) ticks\n"
				"Current: %d s / %d (%#x) ticks\n"
				"Busy count: %lu\n", res,
				wdt->resolution, ctl_sec, ctl, ctl, cur_sec,
				cur, cur, wdt->busy_count);
	}

	return ret;
}

static int bcm_kona_dbg_open(struct inode *inode, struct file *file)
{
	return single_open(file, bcm_kona_wdt_dbg_show, inode->i_private);
}

static const struct file_operations bcm_kona_dbg_operations = {
	.open		= bcm_kona_dbg_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static void bcm_kona_wdt_debug_init(struct platform_device *pdev)
{
	struct dentry *dir;
	struct bcm_kona_wdt *wdt = platform_get_drvdata(pdev);

	if (!wdt)
		return;

	wdt->debugfs = NULL;

	dir = debugfs_create_dir(BCM_KONA_WDT_NAME, NULL);
	if (IS_ERR_OR_NULL(dir))
		return;

	if (debugfs_create_file("info", S_IFREG | S_IRUGO, dir, wdt,
				&bcm_kona_dbg_operations))
		wdt->debugfs = dir;
	else
		debugfs_remove_recursive(dir);
}

static void bcm_kona_wdt_debug_exit(struct platform_device *pdev)
{
	struct bcm_kona_wdt *wdt = platform_get_drvdata(pdev);

	if (wdt && wdt->debugfs) {
		debugfs_remove_recursive(wdt->debugfs);
		wdt->debugfs = NULL;
	}
}

#else

static void bcm_kona_wdt_debug_init(struct platform_device *pdev) {}
static void bcm_kona_wdt_debug_exit(struct platform_device *pdev) {}

#endif /* CONFIG_BCM_KONA_WDT_DEBUG */

static int bcm_kona_wdt_ctrl_reg_modify(struct bcm_kona_wdt *wdt,
					unsigned mask, unsigned newval)
{
	int val;
	unsigned long flags;
	int ret = 0;

	spin_lock_irqsave(&wdt->lock, flags);

	val = secure_register_read(wdt, SECWDOG_CTRL_REG);
	if (val < 0) {
		ret = val;
	} else {
		val &= ~mask;
		val |= newval;
		writel_relaxed(val, wdt->base + SECWDOG_CTRL_REG);
	}

	spin_unlock_irqrestore(&wdt->lock, flags);

	return ret;
}

static int bcm_kona_wdt_set_resolution_reg(struct bcm_kona_wdt *wdt)
{
	if (wdt->resolution > SECWDOG_MAX_RES)
		return -EINVAL;

	return bcm_kona_wdt_ctrl_reg_modify(wdt, SECWDOG_RES_MASK,
					wdt->resolution << SECWDOG_CLKS_SHIFT);
}

static int bcm_kona_wdt_set_timeout_reg(struct watchdog_device *wdog,
					unsigned watchdog_flags)
{
	struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);

	return bcm_kona_wdt_ctrl_reg_modify(wdt, SECWDOG_COUNT_MASK,
					SECS_TO_TICKS(wdog->timeout, wdt) |
					watchdog_flags);
}

static int bcm_kona_wdt_set_timeout(struct watchdog_device *wdog,
	unsigned int t)
{
	wdog->timeout = t;
	return 0;
}

static unsigned int bcm_kona_wdt_get_timeleft(struct watchdog_device *wdog)
{
	struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);
	int val;
	unsigned long flags;

	spin_lock_irqsave(&wdt->lock, flags);
	val = secure_register_read(wdt, SECWDOG_COUNT_REG);
	spin_unlock_irqrestore(&wdt->lock, flags);

	if (val < 0)
		return val;

	return TICKS_TO_SECS(val & SECWDOG_COUNT_MASK, wdt);
}

static int bcm_kona_wdt_start(struct watchdog_device *wdog)
{
	return bcm_kona_wdt_set_timeout_reg(wdog,
					SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK);
}

static int bcm_kona_wdt_stop(struct watchdog_device *wdog)
{
	struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);

	return bcm_kona_wdt_ctrl_reg_modify(wdt, SECWDOG_EN_MASK |
					    SECWDOG_SRSTEN_MASK, 0);
}

static struct watchdog_ops bcm_kona_wdt_ops = {
	.owner =	THIS_MODULE,
	.start =	bcm_kona_wdt_start,
	.stop =		bcm_kona_wdt_stop,
	.set_timeout =	bcm_kona_wdt_set_timeout,
	.get_timeleft =	bcm_kona_wdt_get_timeleft,
};

static struct watchdog_info bcm_kona_wdt_info = {
	.options =	WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE |
			WDIOF_KEEPALIVEPING,
	.identity =	"Broadcom Kona Watchdog Timer",
};

static struct watchdog_device bcm_kona_wdt_wdd = {
	.info =		&bcm_kona_wdt_info,
	.ops =		&bcm_kona_wdt_ops,
	.min_timeout =	1,
	.max_timeout =	SECWDOG_MAX_COUNT >> SECWDOG_DEFAULT_RESOLUTION,
	.timeout =	SECWDOG_MAX_COUNT >> SECWDOG_DEFAULT_RESOLUTION,
};

static void bcm_kona_wdt_shutdown(struct platform_device *pdev)
{
	bcm_kona_wdt_stop(&bcm_kona_wdt_wdd);
}

static int bcm_kona_wdt_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct bcm_kona_wdt *wdt;
	struct resource *res;
	int ret;

	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
	if (!wdt)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	wdt->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(wdt->base))
		return -ENODEV;

	wdt->resolution = SECWDOG_DEFAULT_RESOLUTION;
	ret = bcm_kona_wdt_set_resolution_reg(wdt);
	if (ret) {
		dev_err(dev, "Failed to set resolution (error: %d)", ret);
		return ret;
	}

	spin_lock_init(&wdt->lock);
	platform_set_drvdata(pdev, wdt);
	watchdog_set_drvdata(&bcm_kona_wdt_wdd, wdt);

	ret = bcm_kona_wdt_set_timeout_reg(&bcm_kona_wdt_wdd, 0);
	if (ret) {
		dev_err(dev, "Failed set watchdog timeout");
		return ret;
	}

	ret = watchdog_register_device(&bcm_kona_wdt_wdd);
	if (ret) {
		dev_err(dev, "Failed to register watchdog device");
		return ret;
	}

	bcm_kona_wdt_debug_init(pdev);
	dev_dbg(dev, "Broadcom Kona Watchdog Timer");

	return 0;
}

static int bcm_kona_wdt_remove(struct platform_device *pdev)
{
	bcm_kona_wdt_debug_exit(pdev);
	bcm_kona_wdt_shutdown(pdev);
	watchdog_unregister_device(&bcm_kona_wdt_wdd);
	dev_dbg(&pdev->dev, "Watchdog driver disabled");

	return 0;
}

static const struct of_device_id bcm_kona_wdt_of_match[] = {
	{ .compatible = "brcm,kona-wdt", },
	{},
};
MODULE_DEVICE_TABLE(of, bcm_kona_wdt_of_match);

static struct platform_driver bcm_kona_wdt_driver = {
	.driver = {
			.name = BCM_KONA_WDT_NAME,
			.of_match_table = bcm_kona_wdt_of_match,
		  },
	.probe = bcm_kona_wdt_probe,
	.remove = bcm_kona_wdt_remove,
	.shutdown = bcm_kona_wdt_shutdown,
};

module_platform_driver(bcm_kona_wdt_driver);

MODULE_ALIAS("platform:" BCM_KONA_WDT_NAME);
MODULE_AUTHOR("Markus Mayer <mmayer@broadcom.com>");
MODULE_DESCRIPTION("Broadcom Kona Watchdog Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
6adb730d MM	1	/*
	2	* Copyright (C) 2013 Broadcom Corporation
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License as
	6	* published by the Free Software Foundation version 2.
	7	*
	8	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	9	* kind, whether express or implied; without even the implied warranty
	10	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*/
	13
6e2ac20e	14	#include <linux/debugfs.h>
6adb730d MM	15	#include <linux/delay.h>
	16	#include <linux/err.h>
	17	#include <linux/io.h>
	18	#include <linux/module.h>
	19	#include <linux/of_address.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/watchdog.h>
	22
	23	#define SECWDOG_CTRL_REG 0x00000000
	24	#define SECWDOG_COUNT_REG 0x00000004
	25
	26	#define SECWDOG_RESERVED_MASK 0x1dffffff
	27	#define SECWDOG_WD_LOAD_FLAG 0x10000000
	28	#define SECWDOG_EN_MASK 0x08000000
	29	#define SECWDOG_SRSTEN_MASK 0x04000000
	30	#define SECWDOG_RES_MASK 0x00f00000
	31	#define SECWDOG_COUNT_MASK 0x000fffff
	32
	33	#define SECWDOG_MAX_COUNT SECWDOG_COUNT_MASK
	34	#define SECWDOG_CLKS_SHIFT 20
	35	#define SECWDOG_MAX_RES 15
	36	#define SECWDOG_DEFAULT_RESOLUTION 4
	37	#define SECWDOG_MAX_TRY 1000
	38
	39	#define SECS_TO_TICKS(x, w) ((x) << (w)->resolution)
	40	#define TICKS_TO_SECS(x, w) ((x) >> (w)->resolution)
	41
	42	#define BCM_KONA_WDT_NAME "bcm_kona_wdt"
	43
	44	struct bcm_kona_wdt {
	45	void __iomem *base;
	46	/*
	47	* One watchdog tick is 1/(2^resolution) seconds. Resolution can take
	48	* the values 0-15, meaning one tick can be 1s to 30.52us. Our default
	49	* resolution of 4 means one tick is 62.5ms.
	50	*
	51	* The watchdog counter is 20 bits. Depending on resolution, the maximum
	52	* counter value of 0xfffff expires after about 12 days (resolution 0)
	53	* down to only 32s (resolution 15). The default resolution of 4 gives
	54	* us a maximum of about 18 hours and 12 minutes before the watchdog
	55	* times out.
	56	*/
	57	int resolution;
	58	spinlock_t lock;
6e2ac20e MM	59	#ifdef CONFIG_BCM_KONA_WDT_DEBUG
	60	unsigned long busy_count;
	61	struct dentry *debugfs;
	62	#endif
6adb730d MM	63	};
6adb730d MM	64
6e2ac20e	65	static int secure_register_read(struct bcm_kona_wdt *wdt, uint32_t offset)
6adb730d MM	66	{
	67	uint32_t val;
	68	unsigned count = 0;
	69
	70	/*
	71	* If the WD_LOAD_FLAG is set, the watchdog counter field is being
	72	* updated in hardware. Once the WD timer is updated in hardware, it
	73	* gets cleared.
	74	*/
	75	do {
	76	if (unlikely(count > 1))
	77	udelay(5);
6e2ac20e	78	val = readl_relaxed(wdt->base + offset);
6adb730d MM	79	count++;
	80	} while ((val & SECWDOG_WD_LOAD_FLAG) && count < SECWDOG_MAX_TRY);
	81
6e2ac20e MM	82	#ifdef CONFIG_BCM_KONA_WDT_DEBUG
	83	/* Remember the maximum number iterations due to WD_LOAD_FLAG */
	84	if (count > wdt->busy_count)
	85	wdt->busy_count = count;
	86	#endif
	87
6adb730d MM	88	/* This is the only place we return a negative value. */
	89	if (val & SECWDOG_WD_LOAD_FLAG)
	90	return -ETIMEDOUT;
	91
	92	/* We always mask out reserved bits. */
	93	val &= SECWDOG_RESERVED_MASK;
	94
	95	return val;
	96	}
	97
6e2ac20e MM	98	#ifdef CONFIG_BCM_KONA_WDT_DEBUG
	99
	100	static int bcm_kona_wdt_dbg_show(struct seq_file s, void data)
	101	{
	102	int ctl_val, cur_val, ret;
	103	unsigned long flags;
	104	struct bcm_kona_wdt *wdt = s->private;
	105
	106	if (!wdt)
	107	return seq_puts(s, "No device pointer\n");
	108
	109	spin_lock_irqsave(&wdt->lock, flags);
	110	ctl_val = secure_register_read(wdt, SECWDOG_CTRL_REG);
	111	cur_val = secure_register_read(wdt, SECWDOG_COUNT_REG);
	112	spin_unlock_irqrestore(&wdt->lock, flags);
	113
	114	if (ctl_val < 0 \|\| cur_val < 0) {
	115	ret = seq_puts(s, "Error accessing hardware\n");
	116	} else {
	117	int ctl, cur, ctl_sec, cur_sec, res;
	118
	119	ctl = ctl_val & SECWDOG_COUNT_MASK;
	120	res = (ctl_val & SECWDOG_RES_MASK) >> SECWDOG_CLKS_SHIFT;
	121	cur = cur_val & SECWDOG_COUNT_MASK;
	122	ctl_sec = TICKS_TO_SECS(ctl, wdt);
	123	cur_sec = TICKS_TO_SECS(cur, wdt);
	124	ret = seq_printf(s, "Resolution: %d / %d\n"
	125	"Control: %d s / %d (%#x) ticks\n"
	126	"Current: %d s / %d (%#x) ticks\n"
	127	"Busy count: %lu\n", res,
	128	wdt->resolution, ctl_sec, ctl, ctl, cur_sec,
	129	cur, cur, wdt->busy_count);
	130	}
	131
	132	return ret;
	133	}
	134
	135	static int bcm_kona_dbg_open(struct inode inode, struct file file)
	136	{
	137	return single_open(file, bcm_kona_wdt_dbg_show, inode->i_private);
	138	}
	139
	140	static const struct file_operations bcm_kona_dbg_operations = {
	141	.open = bcm_kona_dbg_open,
	142	.read = seq_read,
	143	.llseek = seq_lseek,
	144	.release = single_release,
	145	};
	146
	147	static void bcm_kona_wdt_debug_init(struct platform_device *pdev)
	148	{
	149	struct dentry *dir;
	150	struct bcm_kona_wdt *wdt = platform_get_drvdata(pdev);
	151
	152	if (!wdt)
	153	return;
	154
	155	wdt->debugfs = NULL;
	156
	157	dir = debugfs_create_dir(BCM_KONA_WDT_NAME, NULL);
	158	if (IS_ERR_OR_NULL(dir))
	159	return;
	160
	161	if (debugfs_create_file("info", S_IFREG \| S_IRUGO, dir, wdt,
162	&bcm_kona_dbg_operations))
163	wdt->debugfs = dir;
164	else
165	debugfs_remove_recursive(dir);
166	}
167
168	static void bcm_kona_wdt_debug_exit(struct platform_device *pdev)
169	{
170	struct bcm_kona_wdt *wdt = platform_get_drvdata(pdev);
171
172	if (wdt && wdt->debugfs) {
173	debugfs_remove_recursive(wdt->debugfs);
174	wdt->debugfs = NULL;
175	}
176	}
177
178	#else
179
180	static void bcm_kona_wdt_debug_init(struct platform_device *pdev) {}
181	static void bcm_kona_wdt_debug_exit(struct platform_device *pdev) {}
182
183	#endif /* CONFIG_BCM_KONA_WDT_DEBUG */
184
6adb730d MM	185	static int bcm_kona_wdt_ctrl_reg_modify(struct bcm_kona_wdt *wdt,
	186	unsigned mask, unsigned newval)
	187	{
	188	int val;
	189	unsigned long flags;
	190	int ret = 0;
	191
	192	spin_lock_irqsave(&wdt->lock, flags);
	193
6e2ac20e	194	val = secure_register_read(wdt, SECWDOG_CTRL_REG);
6adb730d MM	195	if (val < 0) {
	196	ret = val;
	197	} else {
	198	val &= ~mask;
	199	val \|= newval;
	200	writel_relaxed(val, wdt->base + SECWDOG_CTRL_REG);
	201	}
	202
	203	spin_unlock_irqrestore(&wdt->lock, flags);
	204
	205	return ret;
	206	}
	207
	208	static int bcm_kona_wdt_set_resolution_reg(struct bcm_kona_wdt *wdt)
	209	{
	210	if (wdt->resolution > SECWDOG_MAX_RES)
	211	return -EINVAL;
	212
	213	return bcm_kona_wdt_ctrl_reg_modify(wdt, SECWDOG_RES_MASK,
	214	wdt->resolution << SECWDOG_CLKS_SHIFT);
	215	}
	216
	217	static int bcm_kona_wdt_set_timeout_reg(struct watchdog_device *wdog,
	218	unsigned watchdog_flags)
	219	{
	220	struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);
	221
	222	return bcm_kona_wdt_ctrl_reg_modify(wdt, SECWDOG_COUNT_MASK,
	223	SECS_TO_TICKS(wdog->timeout, wdt) \|
	224	watchdog_flags);
	225	}
	226
	227	static int bcm_kona_wdt_set_timeout(struct watchdog_device *wdog,
	228	unsigned int t)
	229	{
	230	wdog->timeout = t;
	231	return 0;
	232	}
	233
	234	static unsigned int bcm_kona_wdt_get_timeleft(struct watchdog_device *wdog)
	235	{
	236	struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);
	237	int val;
	238	unsigned long flags;
	239
	240	spin_lock_irqsave(&wdt->lock, flags);
6e2ac20e	241	val = secure_register_read(wdt, SECWDOG_COUNT_REG);
6adb730d MM	242	spin_unlock_irqrestore(&wdt->lock, flags);
	243
	244	if (val < 0)
	245	return val;
	246
	247	return TICKS_TO_SECS(val & SECWDOG_COUNT_MASK, wdt);
	248	}
	249
	250	static int bcm_kona_wdt_start(struct watchdog_device *wdog)
	251	{
	252	return bcm_kona_wdt_set_timeout_reg(wdog,
	253	SECWDOG_EN_MASK \| SECWDOG_SRSTEN_MASK);
	254	}
	255
	256	static int bcm_kona_wdt_stop(struct watchdog_device *wdog)
	257	{
	258	struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);
	259
	260	return bcm_kona_wdt_ctrl_reg_modify(wdt, SECWDOG_EN_MASK \|
	261	SECWDOG_SRSTEN_MASK, 0);
	262	}
	263
	264	static struct watchdog_ops bcm_kona_wdt_ops = {
	265	.owner = THIS_MODULE,
	266	.start = bcm_kona_wdt_start,
	267	.stop = bcm_kona_wdt_stop,
	268	.set_timeout = bcm_kona_wdt_set_timeout,
	269	.get_timeleft = bcm_kona_wdt_get_timeleft,
	270	};
	271
	272	static struct watchdog_info bcm_kona_wdt_info = {
	273	.options = WDIOF_SETTIMEOUT \| WDIOF_MAGICCLOSE \|
	274	WDIOF_KEEPALIVEPING,
	275	.identity = "Broadcom Kona Watchdog Timer",
	276	};
	277
	278	static struct watchdog_device bcm_kona_wdt_wdd = {
	279	.info = &bcm_kona_wdt_info,
	280	.ops = &bcm_kona_wdt_ops,
	281	.min_timeout = 1,
	282	.max_timeout = SECWDOG_MAX_COUNT >> SECWDOG_DEFAULT_RESOLUTION,
	283	.timeout = SECWDOG_MAX_COUNT >> SECWDOG_DEFAULT_RESOLUTION,
	284	};
	285
	286	static void bcm_kona_wdt_shutdown(struct platform_device *pdev)
	287	{
	288	bcm_kona_wdt_stop(&bcm_kona_wdt_wdd);
	289	}
	290
	291	static int bcm_kona_wdt_probe(struct platform_device *pdev)
	292	{
	293	struct device *dev = &pdev->dev;
	294	struct bcm_kona_wdt *wdt;
	295	struct resource *res;
	296	int ret;
	297
	298	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
	299	if (!wdt)
	300	return -ENOMEM;
	301
	302	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	303	wdt->base = devm_ioremap_resource(dev, res);
	304	if (IS_ERR(wdt->base))
	305	return -ENODEV;
306
307	wdt->resolution = SECWDOG_DEFAULT_RESOLUTION;
308	ret = bcm_kona_wdt_set_resolution_reg(wdt);
309	if (ret) {
310	dev_err(dev, "Failed to set resolution (error: %d)", ret);
311	return ret;
312	}
313
314	spin_lock_init(&wdt->lock);
315	platform_set_drvdata(pdev, wdt);
316	watchdog_set_drvdata(&bcm_kona_wdt_wdd, wdt);
317
318	ret = bcm_kona_wdt_set_timeout_reg(&bcm_kona_wdt_wdd, 0);
319	if (ret) {
320	dev_err(dev, "Failed set watchdog timeout");
321	return ret;
322	}
323
324	ret = watchdog_register_device(&bcm_kona_wdt_wdd);
325	if (ret) {
326	dev_err(dev, "Failed to register watchdog device");
327	return ret;
328	}
329
6e2ac20e	330	bcm_kona_wdt_debug_init(pdev);
6adb730d MM	331	dev_dbg(dev, "Broadcom Kona Watchdog Timer");
	332
	333	return 0;
	334	}
	335
	336	static int bcm_kona_wdt_remove(struct platform_device *pdev)
	337	{
6e2ac20e	338	bcm_kona_wdt_debug_exit(pdev);
6adb730d MM	339	bcm_kona_wdt_shutdown(pdev);
	340	watchdog_unregister_device(&bcm_kona_wdt_wdd);
	341	dev_dbg(&pdev->dev, "Watchdog driver disabled");
	342
	343	return 0;
	344	}
	345
	346	static const struct of_device_id bcm_kona_wdt_of_match[] = {
	347	{ .compatible = "brcm,kona-wdt", },
	348	{},
	349	};
	350	MODULE_DEVICE_TABLE(of, bcm_kona_wdt_of_match);
	351
	352	static struct platform_driver bcm_kona_wdt_driver = {
	353	.driver = {
	354	.name = BCM_KONA_WDT_NAME,
6adb730d MM	355	.of_match_table = bcm_kona_wdt_of_match,
	356	},
	357	.probe = bcm_kona_wdt_probe,
	358	.remove = bcm_kona_wdt_remove,
	359	.shutdown = bcm_kona_wdt_shutdown,
	360	};
	361
	362	module_platform_driver(bcm_kona_wdt_driver);
	363
	364	MODULE_ALIAS("platform:" BCM_KONA_WDT_NAME);
	365	MODULE_AUTHOR("Markus Mayer <mmayer@broadcom.com>");
	366	MODULE_DESCRIPTION("Broadcom Kona Watchdog Driver");
	367	MODULE_LICENSE("GPL v2");