Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 1 | /* |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 2 | * drivers/watchdog/orion_wdt.c |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 3 | * |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 4 | * Watchdog driver for Orion/Kirkwood processors |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 5 | * |
| 6 | * Author: Sylver Bruneau <sylver.bruneau@googlemail.com> |
| 7 | * |
| 8 | * This file is licensed under the terms of the GNU General Public |
| 9 | * License version 2. This program is licensed "as is" without any |
| 10 | * warranty of any kind, whether express or implied. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/moduleparam.h> |
| 15 | #include <linux/types.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/fs.h> |
| 18 | #include <linux/miscdevice.h> |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 19 | #include <linux/platform_device.h> |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 20 | #include <linux/watchdog.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/uaccess.h> |
| 23 | #include <linux/io.h> |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 24 | #include <linux/spinlock.h> |
Nicolas Pitre | fdd8b07 | 2009-04-22 20:08:17 +0100 | [diff] [blame] | 25 | #include <mach/bridge-regs.h> |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 26 | #include <plat/orion_wdt.h> |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 27 | |
| 28 | /* |
| 29 | * Watchdog timer block registers. |
| 30 | */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame^] | 31 | #define TIMER_CTRL 0x0000 |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 32 | #define WDT_EN 0x0010 |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame^] | 33 | #define WDT_VAL 0x0024 |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 34 | |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 35 | #define WDT_MAX_CYCLE_COUNT 0xffffffff |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 36 | #define WDT_IN_USE 0 |
| 37 | #define WDT_OK_TO_CLOSE 1 |
| 38 | |
| 39 | static int nowayout = WATCHDOG_NOWAYOUT; |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 40 | static int heartbeat = -1; /* module parameter (seconds) */ |
| 41 | static unsigned int wdt_max_duration; /* (seconds) */ |
| 42 | static unsigned int wdt_tclk; |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame^] | 43 | static void __iomem *wdt_reg; |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 44 | static unsigned long wdt_status; |
Axel Lin | 1334f32 | 2011-11-29 13:54:01 +0800 | [diff] [blame] | 45 | static DEFINE_SPINLOCK(wdt_lock); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 46 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 47 | static void orion_wdt_ping(void) |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 48 | { |
| 49 | spin_lock(&wdt_lock); |
| 50 | |
| 51 | /* Reload watchdog duration */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame^] | 52 | writel(wdt_tclk * heartbeat, wdt_reg + WDT_VAL); |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 53 | |
| 54 | spin_unlock(&wdt_lock); |
| 55 | } |
| 56 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 57 | static void orion_wdt_enable(void) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 58 | { |
| 59 | u32 reg; |
| 60 | |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 61 | spin_lock(&wdt_lock); |
| 62 | |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 63 | /* Set watchdog duration */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame^] | 64 | writel(wdt_tclk * heartbeat, wdt_reg + WDT_VAL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 65 | |
| 66 | /* Clear watchdog timer interrupt */ |
| 67 | reg = readl(BRIDGE_CAUSE); |
| 68 | reg &= ~WDT_INT_REQ; |
| 69 | writel(reg, BRIDGE_CAUSE); |
| 70 | |
| 71 | /* Enable watchdog timer */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame^] | 72 | reg = readl(wdt_reg + TIMER_CTRL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 73 | reg |= WDT_EN; |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame^] | 74 | writel(reg, wdt_reg + TIMER_CTRL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 75 | |
| 76 | /* Enable reset on watchdog */ |
Thomas Reitmayr | 6462c61 | 2009-06-01 13:38:33 +0200 | [diff] [blame] | 77 | reg = readl(RSTOUTn_MASK); |
| 78 | reg |= WDT_RESET_OUT_EN; |
| 79 | writel(reg, RSTOUTn_MASK); |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 80 | |
| 81 | spin_unlock(&wdt_lock); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 82 | } |
| 83 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 84 | static void orion_wdt_disable(void) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 85 | { |
| 86 | u32 reg; |
| 87 | |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 88 | spin_lock(&wdt_lock); |
| 89 | |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 90 | /* Disable reset on watchdog */ |
Thomas Reitmayr | 6462c61 | 2009-06-01 13:38:33 +0200 | [diff] [blame] | 91 | reg = readl(RSTOUTn_MASK); |
| 92 | reg &= ~WDT_RESET_OUT_EN; |
| 93 | writel(reg, RSTOUTn_MASK); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 94 | |
| 95 | /* Disable watchdog timer */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame^] | 96 | reg = readl(wdt_reg + TIMER_CTRL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 97 | reg &= ~WDT_EN; |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame^] | 98 | writel(reg, wdt_reg + TIMER_CTRL); |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 99 | |
| 100 | spin_unlock(&wdt_lock); |
| 101 | } |
| 102 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 103 | static int orion_wdt_get_timeleft(int *time_left) |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 104 | { |
| 105 | spin_lock(&wdt_lock); |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame^] | 106 | *time_left = readl(wdt_reg + WDT_VAL) / wdt_tclk; |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 107 | spin_unlock(&wdt_lock); |
| 108 | return 0; |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 109 | } |
| 110 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 111 | static int orion_wdt_open(struct inode *inode, struct file *file) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 112 | { |
| 113 | if (test_and_set_bit(WDT_IN_USE, &wdt_status)) |
| 114 | return -EBUSY; |
| 115 | clear_bit(WDT_OK_TO_CLOSE, &wdt_status); |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 116 | orion_wdt_enable(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 117 | return nonseekable_open(inode, file); |
| 118 | } |
| 119 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 120 | static ssize_t orion_wdt_write(struct file *file, const char *data, |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 121 | size_t len, loff_t *ppos) |
| 122 | { |
| 123 | if (len) { |
| 124 | if (!nowayout) { |
| 125 | size_t i; |
| 126 | |
| 127 | clear_bit(WDT_OK_TO_CLOSE, &wdt_status); |
| 128 | for (i = 0; i != len; i++) { |
| 129 | char c; |
| 130 | |
| 131 | if (get_user(c, data + i)) |
| 132 | return -EFAULT; |
| 133 | if (c == 'V') |
| 134 | set_bit(WDT_OK_TO_CLOSE, &wdt_status); |
| 135 | } |
| 136 | } |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 137 | orion_wdt_ping(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 138 | } |
| 139 | return len; |
| 140 | } |
| 141 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 142 | static int orion_wdt_settimeout(int new_time) |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 143 | { |
| 144 | if ((new_time <= 0) || (new_time > wdt_max_duration)) |
| 145 | return -EINVAL; |
| 146 | |
| 147 | /* Set new watchdog time to be used when |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 148 | * orion_wdt_enable() or orion_wdt_ping() is called. */ |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 149 | heartbeat = new_time; |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | static const struct watchdog_info ident = { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 154 | .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | |
| 155 | WDIOF_KEEPALIVEPING, |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 156 | .identity = "Orion Watchdog", |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 157 | }; |
| 158 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 159 | static long orion_wdt_ioctl(struct file *file, unsigned int cmd, |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 160 | unsigned long arg) |
| 161 | { |
| 162 | int ret = -ENOTTY; |
| 163 | int time; |
| 164 | |
| 165 | switch (cmd) { |
| 166 | case WDIOC_GETSUPPORT: |
| 167 | ret = copy_to_user((struct watchdog_info *)arg, &ident, |
| 168 | sizeof(ident)) ? -EFAULT : 0; |
| 169 | break; |
| 170 | |
| 171 | case WDIOC_GETSTATUS: |
| 172 | case WDIOC_GETBOOTSTATUS: |
| 173 | ret = put_user(0, (int *)arg); |
| 174 | break; |
| 175 | |
| 176 | case WDIOC_KEEPALIVE: |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 177 | orion_wdt_ping(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 178 | ret = 0; |
| 179 | break; |
| 180 | |
| 181 | case WDIOC_SETTIMEOUT: |
| 182 | ret = get_user(time, (int *)arg); |
| 183 | if (ret) |
| 184 | break; |
| 185 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 186 | if (orion_wdt_settimeout(time)) { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 187 | ret = -EINVAL; |
| 188 | break; |
| 189 | } |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 190 | orion_wdt_ping(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 191 | /* Fall through */ |
| 192 | |
| 193 | case WDIOC_GETTIMEOUT: |
| 194 | ret = put_user(heartbeat, (int *)arg); |
| 195 | break; |
| 196 | |
| 197 | case WDIOC_GETTIMELEFT: |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 198 | if (orion_wdt_get_timeleft(&time)) { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 199 | ret = -EINVAL; |
| 200 | break; |
| 201 | } |
| 202 | ret = put_user(time, (int *)arg); |
| 203 | break; |
| 204 | } |
| 205 | return ret; |
| 206 | } |
| 207 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 208 | static int orion_wdt_release(struct inode *inode, struct file *file) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 209 | { |
| 210 | if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 211 | orion_wdt_disable(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 212 | else |
| 213 | printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - " |
| 214 | "timer will not stop\n"); |
| 215 | clear_bit(WDT_IN_USE, &wdt_status); |
| 216 | clear_bit(WDT_OK_TO_CLOSE, &wdt_status); |
| 217 | |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 222 | static const struct file_operations orion_wdt_fops = { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 223 | .owner = THIS_MODULE, |
| 224 | .llseek = no_llseek, |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 225 | .write = orion_wdt_write, |
| 226 | .unlocked_ioctl = orion_wdt_ioctl, |
| 227 | .open = orion_wdt_open, |
| 228 | .release = orion_wdt_release, |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 229 | }; |
| 230 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 231 | static struct miscdevice orion_wdt_miscdev = { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 232 | .minor = WATCHDOG_MINOR, |
| 233 | .name = "watchdog", |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 234 | .fops = &orion_wdt_fops, |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 235 | }; |
| 236 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 237 | static int __devinit orion_wdt_probe(struct platform_device *pdev) |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 238 | { |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 239 | struct orion_wdt_platform_data *pdata = pdev->dev.platform_data; |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame^] | 240 | struct resource *res; |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 241 | int ret; |
| 242 | |
| 243 | if (pdata) { |
| 244 | wdt_tclk = pdata->tclk; |
| 245 | } else { |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 246 | printk(KERN_ERR "Orion Watchdog misses platform data\n"); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 247 | return -ENODEV; |
| 248 | } |
| 249 | |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame^] | 250 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 251 | |
| 252 | wdt_reg = ioremap(res->start, resource_size(res)); |
| 253 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 254 | if (orion_wdt_miscdev.parent) |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 255 | return -EBUSY; |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 256 | orion_wdt_miscdev.parent = &pdev->dev; |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 257 | |
| 258 | wdt_max_duration = WDT_MAX_CYCLE_COUNT / wdt_tclk; |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 259 | if (orion_wdt_settimeout(heartbeat)) |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 260 | heartbeat = wdt_max_duration; |
| 261 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 262 | ret = misc_register(&orion_wdt_miscdev); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 263 | if (ret) |
| 264 | return ret; |
| 265 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 266 | printk(KERN_INFO "Orion Watchdog Timer: Initial timeout %d sec%s\n", |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 267 | heartbeat, nowayout ? ", nowayout" : ""); |
| 268 | return 0; |
| 269 | } |
| 270 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 271 | static int __devexit orion_wdt_remove(struct platform_device *pdev) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 272 | { |
| 273 | int ret; |
| 274 | |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 275 | if (test_bit(WDT_IN_USE, &wdt_status)) { |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 276 | orion_wdt_disable(); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 277 | clear_bit(WDT_IN_USE, &wdt_status); |
| 278 | } |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 279 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 280 | ret = misc_deregister(&orion_wdt_miscdev); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 281 | if (!ret) |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 282 | orion_wdt_miscdev.parent = NULL; |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 283 | |
| 284 | return ret; |
| 285 | } |
| 286 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 287 | static void orion_wdt_shutdown(struct platform_device *pdev) |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 288 | { |
| 289 | if (test_bit(WDT_IN_USE, &wdt_status)) |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 290 | orion_wdt_disable(); |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 291 | } |
| 292 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 293 | static struct platform_driver orion_wdt_driver = { |
| 294 | .probe = orion_wdt_probe, |
| 295 | .remove = __devexit_p(orion_wdt_remove), |
| 296 | .shutdown = orion_wdt_shutdown, |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 297 | .driver = { |
| 298 | .owner = THIS_MODULE, |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 299 | .name = "orion_wdt", |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 300 | }, |
| 301 | }; |
| 302 | |
Axel Lin | b8ec611 | 2011-11-29 13:56:27 +0800 | [diff] [blame] | 303 | module_platform_driver(orion_wdt_driver); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 304 | |
| 305 | MODULE_AUTHOR("Sylver Bruneau <sylver.bruneau@googlemail.com>"); |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 306 | MODULE_DESCRIPTION("Orion Processor Watchdog"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 307 | |
| 308 | module_param(heartbeat, int, 0); |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 309 | MODULE_PARM_DESC(heartbeat, "Initial watchdog heartbeat in seconds"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 310 | |
| 311 | module_param(nowayout, int, 0); |
Thomas Reitmayr | df6707b | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 312 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" |
| 313 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 314 | |
| 315 | MODULE_LICENSE("GPL"); |
| 316 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |