blob: 8285d65cd2074ff71b954a16e30e39c719808623 [file] [log] [blame]
Komal Shah7768a132006-09-29 01:59:18 -07001/*
Felipe Balbi28171422008-09-20 04:14:01 +03002 * omap_wdt.c
Komal Shah7768a132006-09-29 01:59:18 -07003 *
Felipe Balbi28171422008-09-20 04:14:01 +03004 * Watchdog driver for the TI OMAP 16xx & 24xx/34xx 32KHz (non-secure) watchdog
Komal Shah7768a132006-09-29 01:59:18 -07005 *
6 * Author: MontaVista Software, Inc.
7 * <gdavis@mvista.com> or <source@mvista.com>
8 *
9 * 2003 (c) MontaVista Software, Inc. This file is licensed under the
10 * terms of the GNU General Public License version 2. This program is
11 * licensed "as is" without any warranty of any kind, whether express
12 * or implied.
13 *
14 * History:
15 *
16 * 20030527: George G. Davis <gdavis@mvista.com>
17 * Initially based on linux-2.4.19-rmk7-pxa1/drivers/char/sa1100_wdt.c
18 * (c) Copyright 2000 Oleg Drokin <green@crimea.edu>
Alan Cox29fa0582008-10-27 15:17:56 +000019 * Based on SoftDog driver by Alan Cox <alan@lxorguk.ukuu.org.uk>
Komal Shah7768a132006-09-29 01:59:18 -070020 *
21 * Copyright (c) 2004 Texas Instruments.
22 * 1. Modified to support OMAP1610 32-KHz watchdog timer
23 * 2. Ported to 2.6 kernel
24 *
25 * Copyright (c) 2005 David Brownell
26 * Use the driver model and standard identifiers; handle bigger timeouts.
27 */
28
Joe Perches27c766a2012-02-15 15:06:19 -080029#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30
Komal Shah7768a132006-09-29 01:59:18 -070031#include <linux/module.h>
Komal Shah7768a132006-09-29 01:59:18 -070032#include <linux/types.h>
33#include <linux/kernel.h>
34#include <linux/fs.h>
35#include <linux/mm.h>
36#include <linux/miscdevice.h>
37#include <linux/watchdog.h>
38#include <linux/reboot.h>
Komal Shah7768a132006-09-29 01:59:18 -070039#include <linux/init.h>
40#include <linux/err.h>
41#include <linux/platform_device.h>
42#include <linux/moduleparam.h>
Jiri Slaby1977f032007-10-18 23:40:25 -070043#include <linux/bitops.h>
Wim Van Sebroeck089ab072008-07-15 11:46:11 +000044#include <linux/io.h>
Alan Cox12b9df72008-05-19 14:07:32 +010045#include <linux/uaccess.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090046#include <linux/slab.h>
Varadarajan, Charulatha7ec5ad02010-09-23 20:02:43 +053047#include <linux/pm_runtime.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010048#include <mach/hardware.h>
Tony Lindgrence491cf2009-10-20 09:40:47 -070049#include <plat/prcm.h>
Komal Shah7768a132006-09-29 01:59:18 -070050
51#include "omap_wdt.h"
52
Felipe Balbi28171422008-09-20 04:14:01 +030053static struct platform_device *omap_wdt_dev;
54
Komal Shah7768a132006-09-29 01:59:18 -070055static unsigned timer_margin;
56module_param(timer_margin, uint, 0);
57MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)");
58
Komal Shah7768a132006-09-29 01:59:18 -070059static unsigned int wdt_trgr_pattern = 0x1234;
Axel Lin1334f322011-11-29 13:54:01 +080060static DEFINE_SPINLOCK(wdt_lock);
Komal Shah7768a132006-09-29 01:59:18 -070061
Felipe Balbi28171422008-09-20 04:14:01 +030062struct omap_wdt_dev {
63 void __iomem *base; /* physical */
64 struct device *dev;
65 int omap_wdt_users;
Felipe Balbi28171422008-09-20 04:14:01 +030066 struct resource *mem;
67 struct miscdevice omap_wdt_miscdev;
68};
69
70static void omap_wdt_ping(struct omap_wdt_dev *wdev)
Komal Shah7768a132006-09-29 01:59:18 -070071{
Felipe Balbi28171422008-09-20 04:14:01 +030072 void __iomem *base = wdev->base;
Felipe Balbib3112182008-09-20 04:14:03 +030073
Komal Shah7768a132006-09-29 01:59:18 -070074 /* wait for posted write to complete */
Felipe Balbi9f69e3b2008-09-20 04:14:02 +030075 while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
Komal Shah7768a132006-09-29 01:59:18 -070076 cpu_relax();
Felipe Balbib3112182008-09-20 04:14:03 +030077
Komal Shah7768a132006-09-29 01:59:18 -070078 wdt_trgr_pattern = ~wdt_trgr_pattern;
Felipe Balbi9f69e3b2008-09-20 04:14:02 +030079 __raw_writel(wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR));
Felipe Balbib3112182008-09-20 04:14:03 +030080
Komal Shah7768a132006-09-29 01:59:18 -070081 /* wait for posted write to complete */
Felipe Balbi9f69e3b2008-09-20 04:14:02 +030082 while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
Komal Shah7768a132006-09-29 01:59:18 -070083 cpu_relax();
84 /* reloaded WCRR from WLDR */
85}
86
Felipe Balbi28171422008-09-20 04:14:01 +030087static void omap_wdt_enable(struct omap_wdt_dev *wdev)
Komal Shah7768a132006-09-29 01:59:18 -070088{
Felipe Balbib3112182008-09-20 04:14:03 +030089 void __iomem *base = wdev->base;
90
Komal Shah7768a132006-09-29 01:59:18 -070091 /* Sequence to enable the watchdog */
Felipe Balbi9f69e3b2008-09-20 04:14:02 +030092 __raw_writel(0xBBBB, base + OMAP_WATCHDOG_SPR);
93 while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x10)
Komal Shah7768a132006-09-29 01:59:18 -070094 cpu_relax();
Felipe Balbib3112182008-09-20 04:14:03 +030095
Felipe Balbi9f69e3b2008-09-20 04:14:02 +030096 __raw_writel(0x4444, base + OMAP_WATCHDOG_SPR);
97 while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x10)
Komal Shah7768a132006-09-29 01:59:18 -070098 cpu_relax();
99}
100
Felipe Balbi28171422008-09-20 04:14:01 +0300101static void omap_wdt_disable(struct omap_wdt_dev *wdev)
Komal Shah7768a132006-09-29 01:59:18 -0700102{
Felipe Balbib3112182008-09-20 04:14:03 +0300103 void __iomem *base = wdev->base;
104
Komal Shah7768a132006-09-29 01:59:18 -0700105 /* sequence required to disable watchdog */
Felipe Balbi9f69e3b2008-09-20 04:14:02 +0300106 __raw_writel(0xAAAA, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */
107 while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x10)
Komal Shah7768a132006-09-29 01:59:18 -0700108 cpu_relax();
Felipe Balbib3112182008-09-20 04:14:03 +0300109
Felipe Balbi9f69e3b2008-09-20 04:14:02 +0300110 __raw_writel(0x5555, base + OMAP_WATCHDOG_SPR); /* TIMER_MODE */
111 while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x10)
Komal Shah7768a132006-09-29 01:59:18 -0700112 cpu_relax();
113}
114
115static void omap_wdt_adjust_timeout(unsigned new_timeout)
116{
117 if (new_timeout < TIMER_MARGIN_MIN)
118 new_timeout = TIMER_MARGIN_DEFAULT;
119 if (new_timeout > TIMER_MARGIN_MAX)
120 new_timeout = TIMER_MARGIN_MAX;
121 timer_margin = new_timeout;
122}
123
Felipe Balbi28171422008-09-20 04:14:01 +0300124static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev)
Komal Shah7768a132006-09-29 01:59:18 -0700125{
126 u32 pre_margin = GET_WLDR_VAL(timer_margin);
Felipe Balbib3112182008-09-20 04:14:03 +0300127 void __iomem *base = wdev->base;
Komal Shah7768a132006-09-29 01:59:18 -0700128
Paul Walmsley0503add2011-03-10 22:40:05 -0700129 pm_runtime_get_sync(wdev->dev);
130
Komal Shah7768a132006-09-29 01:59:18 -0700131 /* just count up at 32 KHz */
Felipe Balbi9f69e3b2008-09-20 04:14:02 +0300132 while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x04)
Komal Shah7768a132006-09-29 01:59:18 -0700133 cpu_relax();
Felipe Balbib3112182008-09-20 04:14:03 +0300134
Felipe Balbi9f69e3b2008-09-20 04:14:02 +0300135 __raw_writel(pre_margin, base + OMAP_WATCHDOG_LDR);
136 while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x04)
Komal Shah7768a132006-09-29 01:59:18 -0700137 cpu_relax();
Paul Walmsley0503add2011-03-10 22:40:05 -0700138
139 pm_runtime_put_sync(wdev->dev);
Komal Shah7768a132006-09-29 01:59:18 -0700140}
141
142/*
143 * Allow only one task to hold it open
144 */
Komal Shah7768a132006-09-29 01:59:18 -0700145static int omap_wdt_open(struct inode *inode, struct file *file)
146{
Felipe Balbib3112182008-09-20 04:14:03 +0300147 struct omap_wdt_dev *wdev = platform_get_drvdata(omap_wdt_dev);
148 void __iomem *base = wdev->base;
149
Felipe Balbi28171422008-09-20 04:14:01 +0300150 if (test_and_set_bit(1, (unsigned long *)&(wdev->omap_wdt_users)))
Komal Shah7768a132006-09-29 01:59:18 -0700151 return -EBUSY;
152
Varadarajan, Charulatha7ec5ad02010-09-23 20:02:43 +0530153 pm_runtime_get_sync(wdev->dev);
Komal Shah7768a132006-09-29 01:59:18 -0700154
155 /* initialize prescaler */
Felipe Balbi9f69e3b2008-09-20 04:14:02 +0300156 while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
Komal Shah7768a132006-09-29 01:59:18 -0700157 cpu_relax();
Felipe Balbib3112182008-09-20 04:14:03 +0300158
Felipe Balbi9f69e3b2008-09-20 04:14:02 +0300159 __raw_writel((1 << 5) | (PTV << 2), base + OMAP_WATCHDOG_CNTRL);
160 while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
Komal Shah7768a132006-09-29 01:59:18 -0700161 cpu_relax();
162
Felipe Balbi28171422008-09-20 04:14:01 +0300163 file->private_data = (void *) wdev;
164
165 omap_wdt_set_timeout(wdev);
Ulrik Bech Hald789cd472009-06-12 16:18:32 -0500166 omap_wdt_ping(wdev); /* trigger loading of new timeout value */
Felipe Balbi28171422008-09-20 04:14:01 +0300167 omap_wdt_enable(wdev);
Felipe Balbib3112182008-09-20 04:14:03 +0300168
Paul Walmsley0503add2011-03-10 22:40:05 -0700169 pm_runtime_put_sync(wdev->dev);
170
Wim Van Sebroeckec9505a2007-07-20 20:41:37 +0000171 return nonseekable_open(inode, file);
Komal Shah7768a132006-09-29 01:59:18 -0700172}
173
174static int omap_wdt_release(struct inode *inode, struct file *file)
175{
Felipe Balbib3112182008-09-20 04:14:03 +0300176 struct omap_wdt_dev *wdev = file->private_data;
177
Komal Shah7768a132006-09-29 01:59:18 -0700178 /*
179 * Shut off the timer unless NOWAYOUT is defined.
180 */
181#ifndef CONFIG_WATCHDOG_NOWAYOUT
Paul Walmsley0503add2011-03-10 22:40:05 -0700182 pm_runtime_get_sync(wdev->dev);
Komal Shah7768a132006-09-29 01:59:18 -0700183
Felipe Balbi28171422008-09-20 04:14:01 +0300184 omap_wdt_disable(wdev);
Komal Shah7768a132006-09-29 01:59:18 -0700185
Varadarajan, Charulatha7ec5ad02010-09-23 20:02:43 +0530186 pm_runtime_put_sync(wdev->dev);
Komal Shah7768a132006-09-29 01:59:18 -0700187#else
Joe Perches27c766a2012-02-15 15:06:19 -0800188 pr_crit("Unexpected close, not stopping!\n");
Komal Shah7768a132006-09-29 01:59:18 -0700189#endif
Felipe Balbi28171422008-09-20 04:14:01 +0300190 wdev->omap_wdt_users = 0;
Felipe Balbib3112182008-09-20 04:14:03 +0300191
Komal Shah7768a132006-09-29 01:59:18 -0700192 return 0;
193}
194
Alan Cox12b9df72008-05-19 14:07:32 +0100195static ssize_t omap_wdt_write(struct file *file, const char __user *data,
Komal Shah7768a132006-09-29 01:59:18 -0700196 size_t len, loff_t *ppos)
197{
Felipe Balbib3112182008-09-20 04:14:03 +0300198 struct omap_wdt_dev *wdev = file->private_data;
199
Komal Shah7768a132006-09-29 01:59:18 -0700200 /* Refresh LOAD_TIME. */
Alan Cox12b9df72008-05-19 14:07:32 +0100201 if (len) {
Paul Walmsley0503add2011-03-10 22:40:05 -0700202 pm_runtime_get_sync(wdev->dev);
Alan Cox12b9df72008-05-19 14:07:32 +0100203 spin_lock(&wdt_lock);
Felipe Balbi28171422008-09-20 04:14:01 +0300204 omap_wdt_ping(wdev);
Alan Cox12b9df72008-05-19 14:07:32 +0100205 spin_unlock(&wdt_lock);
Paul Walmsley0503add2011-03-10 22:40:05 -0700206 pm_runtime_put_sync(wdev->dev);
Alan Cox12b9df72008-05-19 14:07:32 +0100207 }
Komal Shah7768a132006-09-29 01:59:18 -0700208 return len;
209}
210
Alan Cox12b9df72008-05-19 14:07:32 +0100211static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
212 unsigned long arg)
Komal Shah7768a132006-09-29 01:59:18 -0700213{
Felipe Balbi28171422008-09-20 04:14:01 +0300214 struct omap_wdt_dev *wdev;
Komal Shah7768a132006-09-29 01:59:18 -0700215 int new_margin;
Alan Cox12b9df72008-05-19 14:07:32 +0100216 static const struct watchdog_info ident = {
Komal Shah7768a132006-09-29 01:59:18 -0700217 .identity = "OMAP Watchdog",
218 .options = WDIOF_SETTIMEOUT,
219 .firmware_version = 0,
220 };
Felipe Balbib3112182008-09-20 04:14:03 +0300221
Felipe Balbi28171422008-09-20 04:14:01 +0300222 wdev = file->private_data;
Komal Shah7768a132006-09-29 01:59:18 -0700223
224 switch (cmd) {
Komal Shah7768a132006-09-29 01:59:18 -0700225 case WDIOC_GETSUPPORT:
226 return copy_to_user((struct watchdog_info __user *)arg, &ident,
227 sizeof(ident));
228 case WDIOC_GETSTATUS:
229 return put_user(0, (int __user *)arg);
230 case WDIOC_GETBOOTSTATUS:
231 if (cpu_is_omap16xx())
Felipe Balbi9f69e3b2008-09-20 04:14:02 +0300232 return put_user(__raw_readw(ARM_SYSST),
Komal Shah7768a132006-09-29 01:59:18 -0700233 (int __user *)arg);
234 if (cpu_is_omap24xx())
235 return put_user(omap_prcm_get_reset_sources(),
236 (int __user *)arg);
Shubhrajyoti De2bf7c42012-01-04 19:45:28 +0530237 return put_user(0, (int __user *)arg);
Komal Shah7768a132006-09-29 01:59:18 -0700238 case WDIOC_KEEPALIVE:
Paul Walmsley0503add2011-03-10 22:40:05 -0700239 pm_runtime_get_sync(wdev->dev);
Alan Cox12b9df72008-05-19 14:07:32 +0100240 spin_lock(&wdt_lock);
Felipe Balbi28171422008-09-20 04:14:01 +0300241 omap_wdt_ping(wdev);
Alan Cox12b9df72008-05-19 14:07:32 +0100242 spin_unlock(&wdt_lock);
Paul Walmsley0503add2011-03-10 22:40:05 -0700243 pm_runtime_put_sync(wdev->dev);
Komal Shah7768a132006-09-29 01:59:18 -0700244 return 0;
245 case WDIOC_SETTIMEOUT:
246 if (get_user(new_margin, (int __user *)arg))
247 return -EFAULT;
248 omap_wdt_adjust_timeout(new_margin);
249
Paul Walmsley0503add2011-03-10 22:40:05 -0700250 pm_runtime_get_sync(wdev->dev);
Alan Cox12b9df72008-05-19 14:07:32 +0100251 spin_lock(&wdt_lock);
Felipe Balbi28171422008-09-20 04:14:01 +0300252 omap_wdt_disable(wdev);
253 omap_wdt_set_timeout(wdev);
254 omap_wdt_enable(wdev);
Komal Shah7768a132006-09-29 01:59:18 -0700255
Felipe Balbi28171422008-09-20 04:14:01 +0300256 omap_wdt_ping(wdev);
Alan Cox12b9df72008-05-19 14:07:32 +0100257 spin_unlock(&wdt_lock);
Paul Walmsley0503add2011-03-10 22:40:05 -0700258 pm_runtime_put_sync(wdev->dev);
Komal Shah7768a132006-09-29 01:59:18 -0700259 /* Fall */
260 case WDIOC_GETTIMEOUT:
261 return put_user(timer_margin, (int __user *)arg);
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000262 default:
263 return -ENOTTY;
Komal Shah7768a132006-09-29 01:59:18 -0700264 }
265}
266
Arjan van de Ven2b8693c2007-02-12 00:55:32 -0800267static const struct file_operations omap_wdt_fops = {
Komal Shah7768a132006-09-29 01:59:18 -0700268 .owner = THIS_MODULE,
269 .write = omap_wdt_write,
Alan Cox12b9df72008-05-19 14:07:32 +0100270 .unlocked_ioctl = omap_wdt_ioctl,
Komal Shah7768a132006-09-29 01:59:18 -0700271 .open = omap_wdt_open,
272 .release = omap_wdt_release,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200273 .llseek = no_llseek,
Komal Shah7768a132006-09-29 01:59:18 -0700274};
275
Uwe Kleine-König0e3912c2009-03-28 00:26:56 +0100276static int __devinit omap_wdt_probe(struct platform_device *pdev)
Komal Shah7768a132006-09-29 01:59:18 -0700277{
278 struct resource *res, *mem;
Felipe Balbi28171422008-09-20 04:14:01 +0300279 struct omap_wdt_dev *wdev;
Felipe Balbib3112182008-09-20 04:14:03 +0300280 int ret;
Komal Shah7768a132006-09-29 01:59:18 -0700281
282 /* reserve static register mappings */
283 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Felipe Balbib3112182008-09-20 04:14:03 +0300284 if (!res) {
285 ret = -ENOENT;
286 goto err_get_resource;
287 }
Komal Shah7768a132006-09-29 01:59:18 -0700288
Felipe Balbib3112182008-09-20 04:14:03 +0300289 if (omap_wdt_dev) {
290 ret = -EBUSY;
291 goto err_busy;
292 }
Felipe Balbi28171422008-09-20 04:14:01 +0300293
H Hartley Sweetenb782a562009-12-04 12:24:04 -0500294 mem = request_mem_region(res->start, resource_size(res), pdev->name);
Felipe Balbib3112182008-09-20 04:14:03 +0300295 if (!mem) {
296 ret = -EBUSY;
297 goto err_busy;
298 }
Komal Shah7768a132006-09-29 01:59:18 -0700299
Felipe Balbi28171422008-09-20 04:14:01 +0300300 wdev = kzalloc(sizeof(struct omap_wdt_dev), GFP_KERNEL);
301 if (!wdev) {
302 ret = -ENOMEM;
Felipe Balbib3112182008-09-20 04:14:03 +0300303 goto err_kzalloc;
Felipe Balbi28171422008-09-20 04:14:01 +0300304 }
Felipe Balbib3112182008-09-20 04:14:03 +0300305
Felipe Balbi28171422008-09-20 04:14:01 +0300306 wdev->omap_wdt_users = 0;
307 wdev->mem = mem;
Varadarajan, Charulatha7ec5ad02010-09-23 20:02:43 +0530308 wdev->dev = &pdev->dev;
Komal Shah7768a132006-09-29 01:59:18 -0700309
H Hartley Sweetenb782a562009-12-04 12:24:04 -0500310 wdev->base = ioremap(res->start, resource_size(res));
Felipe Balbi9f69e3b2008-09-20 04:14:02 +0300311 if (!wdev->base) {
312 ret = -ENOMEM;
Felipe Balbib3112182008-09-20 04:14:03 +0300313 goto err_ioremap;
Felipe Balbi9f69e3b2008-09-20 04:14:02 +0300314 }
315
Felipe Balbi28171422008-09-20 04:14:01 +0300316 platform_set_drvdata(pdev, wdev);
317
Varadarajan, Charulatha7ec5ad02010-09-23 20:02:43 +0530318 pm_runtime_enable(wdev->dev);
319 pm_runtime_get_sync(wdev->dev);
Ulrik Bech Hald789cd472009-06-12 16:18:32 -0500320
Felipe Balbi28171422008-09-20 04:14:01 +0300321 omap_wdt_disable(wdev);
Komal Shah7768a132006-09-29 01:59:18 -0700322 omap_wdt_adjust_timeout(timer_margin);
323
Felipe Balbi28171422008-09-20 04:14:01 +0300324 wdev->omap_wdt_miscdev.parent = &pdev->dev;
325 wdev->omap_wdt_miscdev.minor = WATCHDOG_MINOR;
326 wdev->omap_wdt_miscdev.name = "watchdog";
327 wdev->omap_wdt_miscdev.fops = &omap_wdt_fops;
328
329 ret = misc_register(&(wdev->omap_wdt_miscdev));
Komal Shah7768a132006-09-29 01:59:18 -0700330 if (ret)
Felipe Balbib3112182008-09-20 04:14:03 +0300331 goto err_misc;
Komal Shah7768a132006-09-29 01:59:18 -0700332
Felipe Balbi28171422008-09-20 04:14:01 +0300333 pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",
Felipe Balbi9f69e3b2008-09-20 04:14:02 +0300334 __raw_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
Felipe Balbi28171422008-09-20 04:14:01 +0300335 timer_margin);
Komal Shah7768a132006-09-29 01:59:18 -0700336
Varadarajan, Charulatha7ec5ad02010-09-23 20:02:43 +0530337 pm_runtime_put_sync(wdev->dev);
Ulrik Bech Hald789cd472009-06-12 16:18:32 -0500338
Felipe Balbi28171422008-09-20 04:14:01 +0300339 omap_wdt_dev = pdev;
340
Komal Shah7768a132006-09-29 01:59:18 -0700341 return 0;
342
Felipe Balbib3112182008-09-20 04:14:03 +0300343err_misc:
Shubhrajyoti D12c583d2012-01-11 19:50:18 +0530344 pm_runtime_disable(wdev->dev);
Felipe Balbib3112182008-09-20 04:14:03 +0300345 platform_set_drvdata(pdev, NULL);
346 iounmap(wdev->base);
347
348err_ioremap:
349 wdev->base = NULL;
Felipe Balbib3112182008-09-20 04:14:03 +0300350 kfree(wdev);
351
352err_kzalloc:
H Hartley Sweetenb782a562009-12-04 12:24:04 -0500353 release_mem_region(res->start, resource_size(res));
Felipe Balbib3112182008-09-20 04:14:03 +0300354
355err_busy:
356err_get_resource:
357
Komal Shah7768a132006-09-29 01:59:18 -0700358 return ret;
359}
360
361static void omap_wdt_shutdown(struct platform_device *pdev)
362{
Felipe Balbib3112182008-09-20 04:14:03 +0300363 struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
Felipe Balbi28171422008-09-20 04:14:01 +0300364
Paul Walmsley0503add2011-03-10 22:40:05 -0700365 if (wdev->omap_wdt_users) {
366 pm_runtime_get_sync(wdev->dev);
Felipe Balbi28171422008-09-20 04:14:01 +0300367 omap_wdt_disable(wdev);
Paul Walmsley0503add2011-03-10 22:40:05 -0700368 pm_runtime_put_sync(wdev->dev);
369 }
Komal Shah7768a132006-09-29 01:59:18 -0700370}
371
Uwe Kleine-König0e3912c2009-03-28 00:26:56 +0100372static int __devexit omap_wdt_remove(struct platform_device *pdev)
Komal Shah7768a132006-09-29 01:59:18 -0700373{
Felipe Balbib3112182008-09-20 04:14:03 +0300374 struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
Felipe Balbi28171422008-09-20 04:14:01 +0300375 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
376
Shubhrajyoti D12c583d2012-01-11 19:50:18 +0530377 pm_runtime_disable(wdev->dev);
Felipe Balbi28171422008-09-20 04:14:01 +0300378 if (!res)
379 return -ENOENT;
380
381 misc_deregister(&(wdev->omap_wdt_miscdev));
H Hartley Sweetenb782a562009-12-04 12:24:04 -0500382 release_mem_region(res->start, resource_size(res));
Felipe Balbi28171422008-09-20 04:14:01 +0300383 platform_set_drvdata(pdev, NULL);
Felipe Balbib3112182008-09-20 04:14:03 +0300384
Felipe Balbi9f69e3b2008-09-20 04:14:02 +0300385 iounmap(wdev->base);
386
Felipe Balbi28171422008-09-20 04:14:01 +0300387 kfree(wdev);
388 omap_wdt_dev = NULL;
Felipe Balbib3112182008-09-20 04:14:03 +0300389
Komal Shah7768a132006-09-29 01:59:18 -0700390 return 0;
391}
392
393#ifdef CONFIG_PM
394
395/* REVISIT ... not clear this is the best way to handle system suspend; and
396 * it's very inappropriate for selective device suspend (e.g. suspending this
397 * through sysfs rather than by stopping the watchdog daemon). Also, this
398 * may not play well enough with NOWAYOUT...
399 */
400
401static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state)
402{
Felipe Balbib3112182008-09-20 04:14:03 +0300403 struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
404
Paul Walmsley0503add2011-03-10 22:40:05 -0700405 if (wdev->omap_wdt_users) {
406 pm_runtime_get_sync(wdev->dev);
Felipe Balbi28171422008-09-20 04:14:01 +0300407 omap_wdt_disable(wdev);
Paul Walmsley0503add2011-03-10 22:40:05 -0700408 pm_runtime_put_sync(wdev->dev);
409 }
Felipe Balbib3112182008-09-20 04:14:03 +0300410
Komal Shah7768a132006-09-29 01:59:18 -0700411 return 0;
412}
413
414static int omap_wdt_resume(struct platform_device *pdev)
415{
Felipe Balbib3112182008-09-20 04:14:03 +0300416 struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
417
Felipe Balbi28171422008-09-20 04:14:01 +0300418 if (wdev->omap_wdt_users) {
Paul Walmsley0503add2011-03-10 22:40:05 -0700419 pm_runtime_get_sync(wdev->dev);
Felipe Balbi28171422008-09-20 04:14:01 +0300420 omap_wdt_enable(wdev);
421 omap_wdt_ping(wdev);
Paul Walmsley0503add2011-03-10 22:40:05 -0700422 pm_runtime_put_sync(wdev->dev);
Komal Shah7768a132006-09-29 01:59:18 -0700423 }
Felipe Balbib3112182008-09-20 04:14:03 +0300424
Komal Shah7768a132006-09-29 01:59:18 -0700425 return 0;
426}
427
428#else
429#define omap_wdt_suspend NULL
430#define omap_wdt_resume NULL
431#endif
432
433static struct platform_driver omap_wdt_driver = {
434 .probe = omap_wdt_probe,
Uwe Kleine-König0e3912c2009-03-28 00:26:56 +0100435 .remove = __devexit_p(omap_wdt_remove),
Komal Shah7768a132006-09-29 01:59:18 -0700436 .shutdown = omap_wdt_shutdown,
437 .suspend = omap_wdt_suspend,
438 .resume = omap_wdt_resume,
439 .driver = {
440 .owner = THIS_MODULE,
441 .name = "omap_wdt",
442 },
443};
444
Axel Linb8ec6112011-11-29 13:56:27 +0800445module_platform_driver(omap_wdt_driver);
Komal Shah7768a132006-09-29 01:59:18 -0700446
447MODULE_AUTHOR("George G. Davis");
448MODULE_LICENSE("GPL");
449MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
Kay Sieversf37d1932008-04-10 21:29:23 -0700450MODULE_ALIAS("platform:omap_wdt");