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> |
Andrew Lunn | 4f04be6 | 2012-03-04 16:57:31 +0100 | [diff] [blame] | 27 | #include <linux/clk.h> |
Nicolas Pitre | fdd8b07 | 2009-04-22 20:08:17 +0100 | [diff] [blame] | 28 | #include <mach/bridge-regs.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) */ |
Andrew Lunn | 4f04be6 | 2012-03-04 16:57:31 +0100 | [diff] [blame] | 44 | static struct clk *clk; |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 45 | static unsigned int wdt_tclk; |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 46 | static void __iomem *wdt_reg; |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 47 | static unsigned long wdt_status; |
Axel Lin | 1334f32 | 2011-11-29 13:54:01 +0800 | [diff] [blame] | 48 | static DEFINE_SPINLOCK(wdt_lock); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 49 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 50 | static void orion_wdt_ping(void) |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 51 | { |
| 52 | spin_lock(&wdt_lock); |
| 53 | |
| 54 | /* Reload watchdog duration */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 55 | writel(wdt_tclk * heartbeat, wdt_reg + WDT_VAL); |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 56 | |
| 57 | spin_unlock(&wdt_lock); |
| 58 | } |
| 59 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 60 | static void orion_wdt_enable(void) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 61 | { |
| 62 | u32 reg; |
| 63 | |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 64 | spin_lock(&wdt_lock); |
| 65 | |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 66 | /* Set watchdog duration */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 67 | writel(wdt_tclk * heartbeat, wdt_reg + WDT_VAL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 68 | |
| 69 | /* Clear watchdog timer interrupt */ |
| 70 | reg = readl(BRIDGE_CAUSE); |
| 71 | reg &= ~WDT_INT_REQ; |
| 72 | writel(reg, BRIDGE_CAUSE); |
| 73 | |
| 74 | /* Enable watchdog timer */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 75 | reg = readl(wdt_reg + TIMER_CTRL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 76 | reg |= WDT_EN; |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 77 | writel(reg, wdt_reg + TIMER_CTRL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 78 | |
| 79 | /* Enable reset on watchdog */ |
Thomas Reitmayr | 6462c61 | 2009-06-01 13:38:33 +0200 | [diff] [blame] | 80 | reg = readl(RSTOUTn_MASK); |
| 81 | reg |= WDT_RESET_OUT_EN; |
| 82 | writel(reg, RSTOUTn_MASK); |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 83 | |
| 84 | spin_unlock(&wdt_lock); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 85 | } |
| 86 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 87 | static void orion_wdt_disable(void) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 88 | { |
| 89 | u32 reg; |
| 90 | |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 91 | spin_lock(&wdt_lock); |
| 92 | |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 93 | /* Disable reset on watchdog */ |
Thomas Reitmayr | 6462c61 | 2009-06-01 13:38:33 +0200 | [diff] [blame] | 94 | reg = readl(RSTOUTn_MASK); |
| 95 | reg &= ~WDT_RESET_OUT_EN; |
| 96 | writel(reg, RSTOUTn_MASK); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 97 | |
| 98 | /* Disable watchdog timer */ |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 99 | reg = readl(wdt_reg + TIMER_CTRL); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 100 | reg &= ~WDT_EN; |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 101 | writel(reg, wdt_reg + TIMER_CTRL); |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 102 | |
| 103 | spin_unlock(&wdt_lock); |
| 104 | } |
| 105 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 106 | static int orion_wdt_get_timeleft(int *time_left) |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 107 | { |
| 108 | spin_lock(&wdt_lock); |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 109 | *time_left = readl(wdt_reg + WDT_VAL) / wdt_tclk; |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 110 | spin_unlock(&wdt_lock); |
| 111 | return 0; |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 112 | } |
| 113 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 114 | static int orion_wdt_open(struct inode *inode, struct file *file) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 115 | { |
| 116 | if (test_and_set_bit(WDT_IN_USE, &wdt_status)) |
| 117 | return -EBUSY; |
| 118 | clear_bit(WDT_OK_TO_CLOSE, &wdt_status); |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 119 | orion_wdt_enable(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 120 | return nonseekable_open(inode, file); |
| 121 | } |
| 122 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 123 | static ssize_t orion_wdt_write(struct file *file, const char *data, |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 124 | size_t len, loff_t *ppos) |
| 125 | { |
| 126 | if (len) { |
| 127 | if (!nowayout) { |
| 128 | size_t i; |
| 129 | |
| 130 | clear_bit(WDT_OK_TO_CLOSE, &wdt_status); |
| 131 | for (i = 0; i != len; i++) { |
| 132 | char c; |
| 133 | |
| 134 | if (get_user(c, data + i)) |
| 135 | return -EFAULT; |
| 136 | if (c == 'V') |
| 137 | set_bit(WDT_OK_TO_CLOSE, &wdt_status); |
| 138 | } |
| 139 | } |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 140 | orion_wdt_ping(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 141 | } |
| 142 | return len; |
| 143 | } |
| 144 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 145 | static int orion_wdt_settimeout(int new_time) |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 146 | { |
| 147 | if ((new_time <= 0) || (new_time > wdt_max_duration)) |
| 148 | return -EINVAL; |
| 149 | |
| 150 | /* Set new watchdog time to be used when |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 151 | * orion_wdt_enable() or orion_wdt_ping() is called. */ |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 152 | heartbeat = new_time; |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | static const struct watchdog_info ident = { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 157 | .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | |
| 158 | WDIOF_KEEPALIVEPING, |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 159 | .identity = "Orion Watchdog", |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 160 | }; |
| 161 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 162 | static long orion_wdt_ioctl(struct file *file, unsigned int cmd, |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 163 | unsigned long arg) |
| 164 | { |
| 165 | int ret = -ENOTTY; |
| 166 | int time; |
| 167 | |
| 168 | switch (cmd) { |
| 169 | case WDIOC_GETSUPPORT: |
| 170 | ret = copy_to_user((struct watchdog_info *)arg, &ident, |
| 171 | sizeof(ident)) ? -EFAULT : 0; |
| 172 | break; |
| 173 | |
| 174 | case WDIOC_GETSTATUS: |
| 175 | case WDIOC_GETBOOTSTATUS: |
| 176 | ret = put_user(0, (int *)arg); |
| 177 | break; |
| 178 | |
| 179 | case WDIOC_KEEPALIVE: |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 180 | orion_wdt_ping(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 181 | ret = 0; |
| 182 | break; |
| 183 | |
| 184 | case WDIOC_SETTIMEOUT: |
| 185 | ret = get_user(time, (int *)arg); |
| 186 | if (ret) |
| 187 | break; |
| 188 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 189 | if (orion_wdt_settimeout(time)) { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 190 | ret = -EINVAL; |
| 191 | break; |
| 192 | } |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 193 | orion_wdt_ping(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 194 | /* Fall through */ |
| 195 | |
| 196 | case WDIOC_GETTIMEOUT: |
| 197 | ret = put_user(heartbeat, (int *)arg); |
| 198 | break; |
| 199 | |
| 200 | case WDIOC_GETTIMELEFT: |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 201 | if (orion_wdt_get_timeleft(&time)) { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 202 | ret = -EINVAL; |
| 203 | break; |
| 204 | } |
| 205 | ret = put_user(time, (int *)arg); |
| 206 | break; |
| 207 | } |
| 208 | return ret; |
| 209 | } |
| 210 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 211 | static int orion_wdt_release(struct inode *inode, struct file *file) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 212 | { |
| 213 | if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 214 | orion_wdt_disable(); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 215 | else |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 216 | pr_crit("Device closed unexpectedly - timer will not stop\n"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 217 | clear_bit(WDT_IN_USE, &wdt_status); |
| 218 | clear_bit(WDT_OK_TO_CLOSE, &wdt_status); |
| 219 | |
| 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 224 | static const struct file_operations orion_wdt_fops = { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 225 | .owner = THIS_MODULE, |
| 226 | .llseek = no_llseek, |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 227 | .write = orion_wdt_write, |
| 228 | .unlocked_ioctl = orion_wdt_ioctl, |
| 229 | .open = orion_wdt_open, |
| 230 | .release = orion_wdt_release, |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 231 | }; |
| 232 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 233 | static struct miscdevice orion_wdt_miscdev = { |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 234 | .minor = WATCHDOG_MINOR, |
| 235 | .name = "watchdog", |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 236 | .fops = &orion_wdt_fops, |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 237 | }; |
| 238 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 239 | static int __devinit orion_wdt_probe(struct platform_device *pdev) |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 240 | { |
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 | |
Andrew Lunn | 4f04be6 | 2012-03-04 16:57:31 +0100 | [diff] [blame] | 244 | clk = clk_get(&pdev->dev, NULL); |
| 245 | if (IS_ERR(clk)) { |
| 246 | printk(KERN_ERR "Orion Watchdog missing clock\n"); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 247 | return -ENODEV; |
| 248 | } |
Andrew Lunn | 4f04be6 | 2012-03-04 16:57:31 +0100 | [diff] [blame] | 249 | clk_prepare_enable(clk); |
| 250 | wdt_tclk = clk_get_rate(clk); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 251 | |
Jason Cooper | a855a7c | 2012-03-15 00:33:26 +0000 | [diff] [blame] | 252 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 253 | |
| 254 | wdt_reg = ioremap(res->start, resource_size(res)); |
| 255 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 256 | if (orion_wdt_miscdev.parent) |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 257 | return -EBUSY; |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 258 | orion_wdt_miscdev.parent = &pdev->dev; |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 259 | |
| 260 | wdt_max_duration = WDT_MAX_CYCLE_COUNT / wdt_tclk; |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 261 | if (orion_wdt_settimeout(heartbeat)) |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 262 | heartbeat = wdt_max_duration; |
| 263 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 264 | ret = misc_register(&orion_wdt_miscdev); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 265 | if (ret) |
| 266 | return ret; |
| 267 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 268 | pr_info("Initial timeout %d sec%s\n", |
| 269 | heartbeat, nowayout ? ", nowayout" : ""); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 270 | return 0; |
| 271 | } |
| 272 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 273 | static int __devexit orion_wdt_remove(struct platform_device *pdev) |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 274 | { |
| 275 | int ret; |
| 276 | |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 277 | if (test_bit(WDT_IN_USE, &wdt_status)) { |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 278 | orion_wdt_disable(); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 279 | clear_bit(WDT_IN_USE, &wdt_status); |
| 280 | } |
Wim Van Sebroeck | 6d0f0df | 2008-10-02 09:32:45 +0000 | [diff] [blame] | 281 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 282 | ret = misc_deregister(&orion_wdt_miscdev); |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 283 | if (!ret) |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 284 | orion_wdt_miscdev.parent = NULL; |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 285 | |
Andrew Lunn | 4f04be6 | 2012-03-04 16:57:31 +0100 | [diff] [blame] | 286 | clk_disable_unprepare(clk); |
| 287 | clk_put(clk); |
| 288 | |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 289 | return ret; |
| 290 | } |
| 291 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 292 | static void orion_wdt_shutdown(struct platform_device *pdev) |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 293 | { |
| 294 | if (test_bit(WDT_IN_USE, &wdt_status)) |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 295 | orion_wdt_disable(); |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 296 | } |
| 297 | |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 298 | static struct platform_driver orion_wdt_driver = { |
| 299 | .probe = orion_wdt_probe, |
| 300 | .remove = __devexit_p(orion_wdt_remove), |
| 301 | .shutdown = orion_wdt_shutdown, |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 302 | .driver = { |
| 303 | .owner = THIS_MODULE, |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 304 | .name = "orion_wdt", |
Thomas Reitmayr | 9e058d4 | 2009-02-24 14:59:22 -0800 | [diff] [blame] | 305 | }, |
| 306 | }; |
| 307 | |
Axel Lin | b8ec611 | 2011-11-29 13:56:27 +0800 | [diff] [blame] | 308 | module_platform_driver(orion_wdt_driver); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 309 | |
| 310 | MODULE_AUTHOR("Sylver Bruneau <sylver.bruneau@googlemail.com>"); |
Nicolas Pitre | 3b937a7 | 2009-06-01 13:56:02 -0400 | [diff] [blame] | 311 | MODULE_DESCRIPTION("Orion Processor Watchdog"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 312 | |
| 313 | module_param(heartbeat, int, 0); |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 314 | MODULE_PARM_DESC(heartbeat, "Initial watchdog heartbeat in seconds"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 315 | |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 316 | module_param(nowayout, bool, 0); |
Thomas Reitmayr | df6707b2 | 2009-02-20 19:44:59 +0100 | [diff] [blame] | 317 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" |
| 318 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
Sylver Bruneau | 22ac923 | 2008-06-26 10:47:45 +0200 | [diff] [blame] | 319 | |
| 320 | MODULE_LICENSE("GPL"); |
| 321 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |