Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2010-2011 Picochip Ltd., Jamie Iles |
| 3 | * http://www.picochip.com |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * as published by the Free Software Foundation; either version |
| 8 | * 2 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This file implements a driver for the Synopsys DesignWare watchdog device |
Baruch Siach | 58a251f | 2013-12-30 14:25:54 +0200 | [diff] [blame] | 11 | * in the many subsystems. The watchdog has 16 different timeout periods |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 12 | * and these are a function of the input clock frequency. |
| 13 | * |
| 14 | * The DesignWare watchdog cannot be stopped once it has been started so we |
| 15 | * use a software timer to implement a ping that will keep the watchdog alive. |
| 16 | * If we receive an expected close for the watchdog then we keep the timer |
| 17 | * running, otherwise the timer is stopped and the watchdog will expire. |
| 18 | */ |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 19 | |
| 20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 21 | |
| 22 | #include <linux/bitops.h> |
| 23 | #include <linux/clk.h> |
Jisheng Zhang | 31228f4 | 2014-09-23 15:42:12 +0800 | [diff] [blame] | 24 | #include <linux/delay.h> |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 25 | #include <linux/device.h> |
| 26 | #include <linux/err.h> |
| 27 | #include <linux/fs.h> |
| 28 | #include <linux/io.h> |
| 29 | #include <linux/kernel.h> |
| 30 | #include <linux/miscdevice.h> |
| 31 | #include <linux/module.h> |
| 32 | #include <linux/moduleparam.h> |
Jisheng Zhang | 31228f4 | 2014-09-23 15:42:12 +0800 | [diff] [blame] | 33 | #include <linux/notifier.h> |
Dinh Nguyen | 58e5637 | 2013-10-22 11:59:12 -0500 | [diff] [blame] | 34 | #include <linux/of.h> |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 35 | #include <linux/pm.h> |
| 36 | #include <linux/platform_device.h> |
Jisheng Zhang | 31228f4 | 2014-09-23 15:42:12 +0800 | [diff] [blame] | 37 | #include <linux/reboot.h> |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 38 | #include <linux/timer.h> |
| 39 | #include <linux/uaccess.h> |
| 40 | #include <linux/watchdog.h> |
| 41 | |
| 42 | #define WDOG_CONTROL_REG_OFFSET 0x00 |
| 43 | #define WDOG_CONTROL_REG_WDT_EN_MASK 0x01 |
| 44 | #define WDOG_TIMEOUT_RANGE_REG_OFFSET 0x04 |
Jisheng Zhang | dfa0714 | 2014-09-23 15:42:11 +0800 | [diff] [blame] | 45 | #define WDOG_TIMEOUT_RANGE_TOPINIT_SHIFT 4 |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 46 | #define WDOG_CURRENT_COUNT_REG_OFFSET 0x08 |
| 47 | #define WDOG_COUNTER_RESTART_REG_OFFSET 0x0c |
| 48 | #define WDOG_COUNTER_RESTART_KICK_VALUE 0x76 |
| 49 | |
| 50 | /* The maximum TOP (timeout period) value that can be set in the watchdog. */ |
| 51 | #define DW_WDT_MAX_TOP 15 |
| 52 | |
Doug Anderson | b5ade9b | 2015-01-27 14:25:17 -0800 | [diff] [blame] | 53 | #define DW_WDT_DEFAULT_SECONDS 30 |
| 54 | |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 55 | static bool nowayout = WATCHDOG_NOWAYOUT; |
| 56 | module_param(nowayout, bool, 0); |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 57 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started " |
| 58 | "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
| 59 | |
| 60 | #define WDT_TIMEOUT (HZ / 2) |
| 61 | |
| 62 | static struct { |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 63 | void __iomem *regs; |
| 64 | struct clk *clk; |
| 65 | unsigned long in_use; |
| 66 | unsigned long next_heartbeat; |
| 67 | struct timer_list timer; |
| 68 | int expect_close; |
Jisheng Zhang | 31228f4 | 2014-09-23 15:42:12 +0800 | [diff] [blame] | 69 | struct notifier_block restart_handler; |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 70 | } dw_wdt; |
| 71 | |
| 72 | static inline int dw_wdt_is_enabled(void) |
| 73 | { |
| 74 | return readl(dw_wdt.regs + WDOG_CONTROL_REG_OFFSET) & |
| 75 | WDOG_CONTROL_REG_WDT_EN_MASK; |
| 76 | } |
| 77 | |
| 78 | static inline int dw_wdt_top_in_seconds(unsigned top) |
| 79 | { |
| 80 | /* |
| 81 | * There are 16 possible timeout values in 0..15 where the number of |
| 82 | * cycles is 2 ^ (16 + i) and the watchdog counts down. |
| 83 | */ |
| 84 | return (1 << (16 + top)) / clk_get_rate(dw_wdt.clk); |
| 85 | } |
| 86 | |
| 87 | static int dw_wdt_get_top(void) |
| 88 | { |
| 89 | int top = readl(dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET) & 0xF; |
| 90 | |
| 91 | return dw_wdt_top_in_seconds(top); |
| 92 | } |
| 93 | |
| 94 | static inline void dw_wdt_set_next_heartbeat(void) |
| 95 | { |
| 96 | dw_wdt.next_heartbeat = jiffies + dw_wdt_get_top() * HZ; |
| 97 | } |
| 98 | |
Doug Anderson | a008501 | 2015-01-27 14:25:16 -0800 | [diff] [blame] | 99 | static void dw_wdt_keepalive(void) |
| 100 | { |
| 101 | writel(WDOG_COUNTER_RESTART_KICK_VALUE, dw_wdt.regs + |
| 102 | WDOG_COUNTER_RESTART_REG_OFFSET); |
| 103 | } |
| 104 | |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 105 | static int dw_wdt_set_top(unsigned top_s) |
| 106 | { |
| 107 | int i, top_val = DW_WDT_MAX_TOP; |
| 108 | |
| 109 | /* |
| 110 | * Iterate over the timeout values until we find the closest match. We |
| 111 | * always look for >=. |
| 112 | */ |
| 113 | for (i = 0; i <= DW_WDT_MAX_TOP; ++i) |
| 114 | if (dw_wdt_top_in_seconds(i) >= top_s) { |
| 115 | top_val = i; |
| 116 | break; |
| 117 | } |
| 118 | |
Doug Anderson | a008501 | 2015-01-27 14:25:16 -0800 | [diff] [blame] | 119 | /* |
| 120 | * Set the new value in the watchdog. Some versions of dw_wdt |
| 121 | * have have TOPINIT in the TIMEOUT_RANGE register (as per |
| 122 | * CP_WDT_DUAL_TOP in WDT_COMP_PARAMS_1). On those we |
| 123 | * effectively get a pat of the watchdog right here. |
| 124 | */ |
Jisheng Zhang | dfa0714 | 2014-09-23 15:42:11 +0800 | [diff] [blame] | 125 | writel(top_val | top_val << WDOG_TIMEOUT_RANGE_TOPINIT_SHIFT, |
| 126 | dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET); |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 127 | |
Doug Anderson | a008501 | 2015-01-27 14:25:16 -0800 | [diff] [blame] | 128 | /* |
| 129 | * Add an explicit pat to handle versions of the watchdog that |
| 130 | * don't have TOPINIT. This won't hurt on versions that have |
| 131 | * it. |
| 132 | */ |
| 133 | dw_wdt_keepalive(); |
| 134 | |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 135 | dw_wdt_set_next_heartbeat(); |
| 136 | |
| 137 | return dw_wdt_top_in_seconds(top_val); |
| 138 | } |
| 139 | |
Jisheng Zhang | 31228f4 | 2014-09-23 15:42:12 +0800 | [diff] [blame] | 140 | static int dw_wdt_restart_handle(struct notifier_block *this, |
| 141 | unsigned long mode, void *cmd) |
| 142 | { |
| 143 | u32 val; |
| 144 | |
| 145 | writel(0, dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET); |
| 146 | val = readl(dw_wdt.regs + WDOG_CONTROL_REG_OFFSET); |
| 147 | if (val & WDOG_CONTROL_REG_WDT_EN_MASK) |
| 148 | writel(WDOG_COUNTER_RESTART_KICK_VALUE, dw_wdt.regs + |
| 149 | WDOG_COUNTER_RESTART_REG_OFFSET); |
| 150 | else |
| 151 | writel(WDOG_CONTROL_REG_WDT_EN_MASK, |
| 152 | dw_wdt.regs + WDOG_CONTROL_REG_OFFSET); |
| 153 | |
| 154 | /* wait for reset to assert... */ |
| 155 | mdelay(500); |
| 156 | |
| 157 | return NOTIFY_DONE; |
| 158 | } |
| 159 | |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 160 | static void dw_wdt_ping(unsigned long data) |
| 161 | { |
| 162 | if (time_before(jiffies, dw_wdt.next_heartbeat) || |
| 163 | (!nowayout && !dw_wdt.in_use)) { |
| 164 | dw_wdt_keepalive(); |
| 165 | mod_timer(&dw_wdt.timer, jiffies + WDT_TIMEOUT); |
| 166 | } else |
| 167 | pr_crit("keepalive missed, machine will reset\n"); |
| 168 | } |
| 169 | |
| 170 | static int dw_wdt_open(struct inode *inode, struct file *filp) |
| 171 | { |
| 172 | if (test_and_set_bit(0, &dw_wdt.in_use)) |
| 173 | return -EBUSY; |
| 174 | |
| 175 | /* Make sure we don't get unloaded. */ |
| 176 | __module_get(THIS_MODULE); |
| 177 | |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 178 | if (!dw_wdt_is_enabled()) { |
| 179 | /* |
| 180 | * The watchdog is not currently enabled. Set the timeout to |
Doug Anderson | b5ade9b | 2015-01-27 14:25:17 -0800 | [diff] [blame] | 181 | * something reasonable and then start it. |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 182 | */ |
Doug Anderson | b5ade9b | 2015-01-27 14:25:17 -0800 | [diff] [blame] | 183 | dw_wdt_set_top(DW_WDT_DEFAULT_SECONDS); |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 184 | writel(WDOG_CONTROL_REG_WDT_EN_MASK, |
| 185 | dw_wdt.regs + WDOG_CONTROL_REG_OFFSET); |
| 186 | } |
| 187 | |
| 188 | dw_wdt_set_next_heartbeat(); |
| 189 | |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 190 | return nonseekable_open(inode, filp); |
| 191 | } |
| 192 | |
Sachin Kamat | 0b93026 | 2013-05-14 12:11:03 +0530 | [diff] [blame] | 193 | static ssize_t dw_wdt_write(struct file *filp, const char __user *buf, |
| 194 | size_t len, loff_t *offset) |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 195 | { |
| 196 | if (!len) |
| 197 | return 0; |
| 198 | |
| 199 | if (!nowayout) { |
| 200 | size_t i; |
| 201 | |
| 202 | dw_wdt.expect_close = 0; |
| 203 | |
| 204 | for (i = 0; i < len; ++i) { |
| 205 | char c; |
| 206 | |
| 207 | if (get_user(c, buf + i)) |
| 208 | return -EFAULT; |
| 209 | |
| 210 | if (c == 'V') { |
| 211 | dw_wdt.expect_close = 1; |
| 212 | break; |
| 213 | } |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | dw_wdt_set_next_heartbeat(); |
Doug Anderson | 04b1a62 | 2015-05-07 21:27:45 -0700 | [diff] [blame^] | 218 | dw_wdt_keepalive(); |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 219 | mod_timer(&dw_wdt.timer, jiffies + WDT_TIMEOUT); |
| 220 | |
| 221 | return len; |
| 222 | } |
| 223 | |
| 224 | static u32 dw_wdt_time_left(void) |
| 225 | { |
| 226 | return readl(dw_wdt.regs + WDOG_CURRENT_COUNT_REG_OFFSET) / |
| 227 | clk_get_rate(dw_wdt.clk); |
| 228 | } |
| 229 | |
| 230 | static const struct watchdog_info dw_wdt_ident = { |
| 231 | .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | |
| 232 | WDIOF_MAGICCLOSE, |
| 233 | .identity = "Synopsys DesignWare Watchdog", |
| 234 | }; |
| 235 | |
| 236 | static long dw_wdt_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
| 237 | { |
| 238 | unsigned long val; |
| 239 | int timeout; |
| 240 | |
| 241 | switch (cmd) { |
| 242 | case WDIOC_GETSUPPORT: |
Jingoo Han | 6029550 | 2013-08-01 14:38:36 +0900 | [diff] [blame] | 243 | return copy_to_user((void __user *)arg, &dw_wdt_ident, |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 244 | sizeof(dw_wdt_ident)) ? -EFAULT : 0; |
| 245 | |
| 246 | case WDIOC_GETSTATUS: |
| 247 | case WDIOC_GETBOOTSTATUS: |
Jingoo Han | 6029550 | 2013-08-01 14:38:36 +0900 | [diff] [blame] | 248 | return put_user(0, (int __user *)arg); |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 249 | |
| 250 | case WDIOC_KEEPALIVE: |
| 251 | dw_wdt_set_next_heartbeat(); |
| 252 | return 0; |
| 253 | |
| 254 | case WDIOC_SETTIMEOUT: |
| 255 | if (get_user(val, (int __user *)arg)) |
| 256 | return -EFAULT; |
| 257 | timeout = dw_wdt_set_top(val); |
| 258 | return put_user(timeout , (int __user *)arg); |
| 259 | |
| 260 | case WDIOC_GETTIMEOUT: |
| 261 | return put_user(dw_wdt_get_top(), (int __user *)arg); |
| 262 | |
| 263 | case WDIOC_GETTIMELEFT: |
| 264 | /* Get the time left until expiry. */ |
| 265 | if (get_user(val, (int __user *)arg)) |
| 266 | return -EFAULT; |
| 267 | return put_user(dw_wdt_time_left(), (int __user *)arg); |
| 268 | |
| 269 | default: |
| 270 | return -ENOTTY; |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | static int dw_wdt_release(struct inode *inode, struct file *filp) |
| 275 | { |
| 276 | clear_bit(0, &dw_wdt.in_use); |
| 277 | |
| 278 | if (!dw_wdt.expect_close) { |
| 279 | del_timer(&dw_wdt.timer); |
| 280 | |
| 281 | if (!nowayout) |
| 282 | pr_crit("unexpected close, system will reboot soon\n"); |
| 283 | else |
| 284 | pr_crit("watchdog cannot be disabled, system will reboot soon\n"); |
| 285 | } |
| 286 | |
| 287 | dw_wdt.expect_close = 0; |
| 288 | |
| 289 | return 0; |
| 290 | } |
| 291 | |
Heiko Stübner | ad83c6c | 2013-06-26 20:03:52 +0200 | [diff] [blame] | 292 | #ifdef CONFIG_PM_SLEEP |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 293 | static int dw_wdt_suspend(struct device *dev) |
| 294 | { |
Heiko Stübner | 280103e | 2013-06-26 20:04:31 +0200 | [diff] [blame] | 295 | clk_disable_unprepare(dw_wdt.clk); |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 296 | |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | static int dw_wdt_resume(struct device *dev) |
| 301 | { |
Heiko Stübner | 280103e | 2013-06-26 20:04:31 +0200 | [diff] [blame] | 302 | int err = clk_prepare_enable(dw_wdt.clk); |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 303 | |
| 304 | if (err) |
| 305 | return err; |
| 306 | |
| 307 | dw_wdt_keepalive(); |
| 308 | |
| 309 | return 0; |
| 310 | } |
Heiko Stübner | ad83c6c | 2013-06-26 20:03:52 +0200 | [diff] [blame] | 311 | #endif /* CONFIG_PM_SLEEP */ |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 312 | |
Heiko Stübner | ad83c6c | 2013-06-26 20:03:52 +0200 | [diff] [blame] | 313 | static SIMPLE_DEV_PM_OPS(dw_wdt_pm_ops, dw_wdt_suspend, dw_wdt_resume); |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 314 | |
| 315 | static const struct file_operations wdt_fops = { |
| 316 | .owner = THIS_MODULE, |
| 317 | .llseek = no_llseek, |
| 318 | .open = dw_wdt_open, |
| 319 | .write = dw_wdt_write, |
| 320 | .unlocked_ioctl = dw_wdt_ioctl, |
| 321 | .release = dw_wdt_release |
| 322 | }; |
| 323 | |
| 324 | static struct miscdevice dw_wdt_miscdev = { |
| 325 | .fops = &wdt_fops, |
| 326 | .name = "watchdog", |
| 327 | .minor = WATCHDOG_MINOR, |
| 328 | }; |
| 329 | |
Bill Pemberton | 2d991a1 | 2012-11-19 13:21:41 -0500 | [diff] [blame] | 330 | static int dw_wdt_drv_probe(struct platform_device *pdev) |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 331 | { |
| 332 | int ret; |
| 333 | struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 334 | |
Thierry Reding | 4c271bb | 2013-01-21 11:09:25 +0100 | [diff] [blame] | 335 | dw_wdt.regs = devm_ioremap_resource(&pdev->dev, mem); |
| 336 | if (IS_ERR(dw_wdt.regs)) |
| 337 | return PTR_ERR(dw_wdt.regs); |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 338 | |
Jingoo Han | cf3cc8c | 2013-04-29 18:15:26 +0900 | [diff] [blame] | 339 | dw_wdt.clk = devm_clk_get(&pdev->dev, NULL); |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 340 | if (IS_ERR(dw_wdt.clk)) |
| 341 | return PTR_ERR(dw_wdt.clk); |
| 342 | |
Heiko Stübner | 280103e | 2013-06-26 20:04:31 +0200 | [diff] [blame] | 343 | ret = clk_prepare_enable(dw_wdt.clk); |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 344 | if (ret) |
Jingoo Han | cf3cc8c | 2013-04-29 18:15:26 +0900 | [diff] [blame] | 345 | return ret; |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 346 | |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 347 | ret = misc_register(&dw_wdt_miscdev); |
| 348 | if (ret) |
| 349 | goto out_disable_clk; |
| 350 | |
Jisheng Zhang | 31228f4 | 2014-09-23 15:42:12 +0800 | [diff] [blame] | 351 | dw_wdt.restart_handler.notifier_call = dw_wdt_restart_handle; |
| 352 | dw_wdt.restart_handler.priority = 128; |
| 353 | ret = register_restart_handler(&dw_wdt.restart_handler); |
| 354 | if (ret) |
| 355 | pr_warn("cannot register restart handler\n"); |
| 356 | |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 357 | dw_wdt_set_next_heartbeat(); |
| 358 | setup_timer(&dw_wdt.timer, dw_wdt_ping, 0); |
| 359 | mod_timer(&dw_wdt.timer, jiffies + WDT_TIMEOUT); |
| 360 | |
| 361 | return 0; |
| 362 | |
| 363 | out_disable_clk: |
Heiko Stübner | 280103e | 2013-06-26 20:04:31 +0200 | [diff] [blame] | 364 | clk_disable_unprepare(dw_wdt.clk); |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 365 | |
| 366 | return ret; |
| 367 | } |
| 368 | |
Bill Pemberton | 4b12b89 | 2012-11-19 13:26:24 -0500 | [diff] [blame] | 369 | static int dw_wdt_drv_remove(struct platform_device *pdev) |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 370 | { |
Jisheng Zhang | 31228f4 | 2014-09-23 15:42:12 +0800 | [diff] [blame] | 371 | unregister_restart_handler(&dw_wdt.restart_handler); |
| 372 | |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 373 | misc_deregister(&dw_wdt_miscdev); |
| 374 | |
Heiko Stübner | 280103e | 2013-06-26 20:04:31 +0200 | [diff] [blame] | 375 | clk_disable_unprepare(dw_wdt.clk); |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 376 | |
| 377 | return 0; |
| 378 | } |
| 379 | |
Dinh Nguyen | 58e5637 | 2013-10-22 11:59:12 -0500 | [diff] [blame] | 380 | #ifdef CONFIG_OF |
| 381 | static const struct of_device_id dw_wdt_of_match[] = { |
| 382 | { .compatible = "snps,dw-wdt", }, |
| 383 | { /* sentinel */ } |
| 384 | }; |
| 385 | MODULE_DEVICE_TABLE(of, dw_wdt_of_match); |
| 386 | #endif |
| 387 | |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 388 | static struct platform_driver dw_wdt_driver = { |
| 389 | .probe = dw_wdt_drv_probe, |
Bill Pemberton | 8226871 | 2012-11-19 13:21:12 -0500 | [diff] [blame] | 390 | .remove = dw_wdt_drv_remove, |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 391 | .driver = { |
| 392 | .name = "dw_wdt", |
Dinh Nguyen | 58e5637 | 2013-10-22 11:59:12 -0500 | [diff] [blame] | 393 | .of_match_table = of_match_ptr(dw_wdt_of_match), |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 394 | .pm = &dw_wdt_pm_ops, |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 395 | }, |
| 396 | }; |
| 397 | |
Axel Lin | b8ec611 | 2011-11-29 13:56:27 +0800 | [diff] [blame] | 398 | module_platform_driver(dw_wdt_driver); |
Jamie Iles | c9353ae | 2011-01-24 12:19:12 +0000 | [diff] [blame] | 399 | |
| 400 | MODULE_AUTHOR("Jamie Iles"); |
| 401 | MODULE_DESCRIPTION("Synopsys DesignWare Watchdog Driver"); |
| 402 | MODULE_LICENSE("GPL"); |