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 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 14 | |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 15 | #include <linux/module.h> |
| 16 | #include <linux/moduleparam.h> |
| 17 | #include <linux/types.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/fs.h> |
| 20 | #include <linux/miscdevice.h> |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 21 | #include <linux/platform_device.h> |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 22 | #include <linux/watchdog.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/uaccess.h> |
| 25 | #include <linux/io.h> |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 26 | #include <linux/spinlock.h> |
Nicolas Pitre | fdd8b07 | 2009-04-22 20:08:17 +0100 | [diff] [blame] | 27 | #include <mach/bridge-regs.h> |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 28 | #include <plat/orion_wdt.h> |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 29 | |
| 30 | /* |
| 31 | * Watchdog timer block registers. |
| 32 | */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 33 | #define TIMER_CTRL 0x0000 |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 34 | #define WDT_EN 0x0010 |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 35 | #define WDT_VAL 0x0024 |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 36 | |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 37 | #define WDT_MAX_CYCLE_COUNT 0xffffffff |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 38 | #define WDT_IN_USE 0 |
| 39 | #define WDT_OK_TO_CLOSE 1 |
| 40 | |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 41 | static bool nowayout = WATCHDOG_NOWAYOUT; |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 42 | static int heartbeat = -1; /* module parameter (seconds) */ |
| 43 | static unsigned int wdt_max_duration; /* (seconds) */ |
| 44 | static unsigned int wdt_tclk; |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 45 | static void __iomem *wdt_reg; |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 46 | static unsigned long wdt_status; |
Axel Lin | 1334f32 | 2011-11-29 13:54:01 +0800 | [diff] [blame] | 47 | static DEFINE_SPINLOCK(wdt_lock); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 48 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 49 | static void orion_wdt_ping(void) |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 50 | { |
| 51 | spin_lock(&wdt_lock); |
| 52 | |
| 53 | /* Reload watchdog duration */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 54 | writel(wdt_tclk * heartbeat, wdt_reg + WDT_VAL); |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 55 | |
| 56 | spin_unlock(&wdt_lock); |
| 57 | } |
| 58 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 59 | static void orion_wdt_enable(void) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 60 | { |
| 61 | u32 reg; |
| 62 | |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 63 | spin_lock(&wdt_lock); |
| 64 | |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 65 | /* Set watchdog duration */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 66 | writel(wdt_tclk * heartbeat, wdt_reg + WDT_VAL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 67 | |
| 68 | /* Clear watchdog timer interrupt */ |
| 69 | reg = readl(BRIDGE_CAUSE); |
| 70 | reg &= ~WDT_INT_REQ; |
| 71 | writel(reg, BRIDGE_CAUSE); |
| 72 | |
| 73 | /* Enable watchdog timer */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 74 | reg = readl(wdt_reg + TIMER_CTRL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 75 | reg |= WDT_EN; |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 76 | writel(reg, wdt_reg + TIMER_CTRL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 77 | |
| 78 | /* Enable reset on watchdog */ |
Thomas Reitmayr | 6462c61 | 2009-06-01 13:38:33 +0200 | [diff] [blame] | 79 | reg = readl(RSTOUTn_MASK); |
| 80 | reg |= WDT_RESET_OUT_EN; |
| 81 | writel(reg, RSTOUTn_MASK); |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 82 | |
| 83 | spin_unlock(&wdt_lock); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 84 | } |
| 85 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 86 | static void orion_wdt_disable(void) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 87 | { |
| 88 | u32 reg; |
| 89 | |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 90 | spin_lock(&wdt_lock); |
| 91 | |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 92 | /* Disable reset on watchdog */ |
Thomas Reitmayr | 6462c61 | 2009-06-01 13:38:33 +0200 | [diff] [blame] | 93 | reg = readl(RSTOUTn_MASK); |
| 94 | reg &= ~WDT_RESET_OUT_EN; |
| 95 | writel(reg, RSTOUTn_MASK); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 96 | |
| 97 | /* Disable watchdog timer */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 98 | reg = readl(wdt_reg + TIMER_CTRL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 99 | reg &= ~WDT_EN; |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 100 | writel(reg, wdt_reg + TIMER_CTRL); |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 101 | |
| 102 | spin_unlock(&wdt_lock); |
| 103 | } |
| 104 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 105 | static int orion_wdt_get_timeleft(int *time_left) |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 106 | { |
| 107 | spin_lock(&wdt_lock); |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 108 | *time_left = readl(wdt_reg + WDT_VAL) / wdt_tclk; |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 109 | spin_unlock(&wdt_lock); |
| 110 | return 0; |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 111 | } |
| 112 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 113 | static int orion_wdt_open(struct inode *inode, struct file *file) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 114 | { |
| 115 | if (test_and_set_bit(WDT_IN_USE, &wdt_status)) |
| 116 | return -EBUSY; |
| 117 | clear_bit(WDT_OK_TO_CLOSE, &wdt_status); |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 118 | orion_wdt_enable(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 119 | return nonseekable_open(inode, file); |
| 120 | } |
| 121 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 122 | static ssize_t orion_wdt_write(struct file *file, const char *data, |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 123 | size_t len, loff_t *ppos) |
| 124 | { |
| 125 | if (len) { |
| 126 | if (!nowayout) { |
| 127 | size_t i; |
| 128 | |
| 129 | clear_bit(WDT_OK_TO_CLOSE, &wdt_status); |
| 130 | for (i = 0; i != len; i++) { |
| 131 | char c; |
| 132 | |
| 133 | if (get_user(c, data + i)) |
| 134 | return -EFAULT; |
| 135 | if (c == 'V') |
| 136 | set_bit(WDT_OK_TO_CLOSE, &wdt_status); |
| 137 | } |
| 138 | } |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 139 | orion_wdt_ping(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 140 | } |
| 141 | return len; |
| 142 | } |
| 143 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 144 | static int orion_wdt_settimeout(int new_time) |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 145 | { |
| 146 | if ((new_time <= 0) || (new_time > wdt_max_duration)) |
| 147 | return -EINVAL; |
| 148 | |
| 149 | /* Set new watchdog time to be used when |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 150 | * orion_wdt_enable() or orion_wdt_ping() is called. */ |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 151 | heartbeat = new_time; |
| 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | static const struct watchdog_info ident = { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 156 | .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | |
| 157 | WDIOF_KEEPALIVEPING, |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 158 | .identity = "Orion Watchdog", |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 159 | }; |
| 160 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 161 | static long orion_wdt_ioctl(struct file *file, unsigned int cmd, |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 162 | unsigned long arg) |
| 163 | { |
| 164 | int ret = -ENOTTY; |
| 165 | int time; |
| 166 | |
| 167 | switch (cmd) { |
| 168 | case WDIOC_GETSUPPORT: |
| 169 | ret = copy_to_user((struct watchdog_info *)arg, &ident, |
| 170 | sizeof(ident)) ? -EFAULT : 0; |
| 171 | break; |
| 172 | |
| 173 | case WDIOC_GETSTATUS: |
| 174 | case WDIOC_GETBOOTSTATUS: |
| 175 | ret = put_user(0, (int *)arg); |
| 176 | break; |
| 177 | |
| 178 | case WDIOC_KEEPALIVE: |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 179 | orion_wdt_ping(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 180 | ret = 0; |
| 181 | break; |
| 182 | |
| 183 | case WDIOC_SETTIMEOUT: |
| 184 | ret = get_user(time, (int *)arg); |
| 185 | if (ret) |
| 186 | break; |
| 187 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 188 | if (orion_wdt_settimeout(time)) { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 189 | ret = -EINVAL; |
| 190 | break; |
| 191 | } |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 192 | orion_wdt_ping(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 193 | /* Fall through */ |
| 194 | |
| 195 | case WDIOC_GETTIMEOUT: |
| 196 | ret = put_user(heartbeat, (int *)arg); |
| 197 | break; |
| 198 | |
| 199 | case WDIOC_GETTIMELEFT: |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 200 | if (orion_wdt_get_timeleft(&time)) { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 201 | ret = -EINVAL; |
| 202 | break; |
| 203 | } |
| 204 | ret = put_user(time, (int *)arg); |
| 205 | break; |
| 206 | } |
| 207 | return ret; |
| 208 | } |
| 209 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 210 | static int orion_wdt_release(struct inode *inode, struct file *file) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 211 | { |
| 212 | if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 213 | orion_wdt_disable(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 214 | else |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 215 | pr_crit("Device closed unexpectedly - timer will not stop\n"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 216 | clear_bit(WDT_IN_USE, &wdt_status); |
| 217 | clear_bit(WDT_OK_TO_CLOSE, &wdt_status); |
| 218 | |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 223 | static const struct file_operations orion_wdt_fops = { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 224 | .owner = THIS_MODULE, |
| 225 | .llseek = no_llseek, |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 226 | .write = orion_wdt_write, |
| 227 | .unlocked_ioctl = orion_wdt_ioctl, |
| 228 | .open = orion_wdt_open, |
| 229 | .release = orion_wdt_release, |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 230 | }; |
| 231 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 232 | static struct miscdevice orion_wdt_miscdev = { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 233 | .minor = WATCHDOG_MINOR, |
| 234 | .name = "watchdog", |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 235 | .fops = &orion_wdt_fops, |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 236 | }; |
| 237 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 238 | static int __devinit orion_wdt_probe(struct platform_device *pdev) |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 239 | { |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 240 | struct orion_wdt_platform_data *pdata = pdev->dev.platform_data; |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 241 | struct resource *res; |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 242 | int ret; |
| 243 | |
| 244 | if (pdata) { |
| 245 | wdt_tclk = pdata->tclk; |
| 246 | } else { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 247 | pr_err("misses platform data\n"); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 248 | return -ENODEV; |
| 249 | } |
| 250 | |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 251 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 252 | |
| 253 | wdt_reg = ioremap(res->start, resource_size(res)); |
| 254 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 255 | if (orion_wdt_miscdev.parent) |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 256 | return -EBUSY; |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 257 | orion_wdt_miscdev.parent = &pdev->dev; |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 258 | |
| 259 | wdt_max_duration = WDT_MAX_CYCLE_COUNT / wdt_tclk; |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 260 | if (orion_wdt_settimeout(heartbeat)) |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 261 | heartbeat = wdt_max_duration; |
| 262 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 263 | ret = misc_register(&orion_wdt_miscdev); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 264 | if (ret) |
| 265 | return ret; |
| 266 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 267 | pr_info("Initial timeout %d sec%s\n", |
| 268 | heartbeat, nowayout ? ", nowayout" : ""); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 269 | return 0; |
| 270 | } |
| 271 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 272 | static int __devexit orion_wdt_remove(struct platform_device *pdev) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 273 | { |
| 274 | int ret; |
| 275 | |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 276 | if (test_bit(WDT_IN_USE, &wdt_status)) { |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 277 | orion_wdt_disable(); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 278 | clear_bit(WDT_IN_USE, &wdt_status); |
| 279 | } |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 280 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 281 | ret = misc_deregister(&orion_wdt_miscdev); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 282 | if (!ret) |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 283 | orion_wdt_miscdev.parent = NULL; |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 284 | |
| 285 | return ret; |
| 286 | } |
| 287 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 288 | static void orion_wdt_shutdown(struct platform_device *pdev) |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 289 | { |
| 290 | if (test_bit(WDT_IN_USE, &wdt_status)) |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 291 | orion_wdt_disable(); |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 292 | } |
| 293 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 294 | static struct platform_driver orion_wdt_driver = { |
| 295 | .probe = orion_wdt_probe, |
| 296 | .remove = __devexit_p(orion_wdt_remove), |
| 297 | .shutdown = orion_wdt_shutdown, |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 298 | .driver = { |
| 299 | .owner = THIS_MODULE, |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 300 | .name = "orion_wdt", |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 301 | }, |
| 302 | }; |
| 303 | |
Axel Lin | b8ec611 | 2011-11-29 13:56:27 +0800 | [diff] [blame] | 304 | module_platform_driver(orion_wdt_driver); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 305 | |
| 306 | MODULE_AUTHOR("Sylver Bruneau <sylver.bruneau@googlemail.com>"); |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 307 | MODULE_DESCRIPTION("Orion Processor Watchdog"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 308 | |
| 309 | module_param(heartbeat, int, 0); |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 310 | MODULE_PARM_DESC(heartbeat, "Initial watchdog heartbeat in seconds"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 311 | |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 312 | module_param(nowayout, bool, 0); |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 313 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" |
| 314 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 315 | |
| 316 | MODULE_LICENSE("GPL"); |
| 317 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |