Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 1 | /* |
Anton Vorontsov | 0d7b101 | 2008-07-03 23:51:36 -0700 | [diff] [blame^] | 2 | * mpc8xxx_wdt.c - MPC8xx/MPC83xx/MPC86xx watchdog userspace interface |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 3 | * |
| 4 | * Authors: Dave Updegraff <dave@cray.org> |
| 5 | * Kumar Gala <galak@kernel.crashing.org> |
| 6 | * Attribution: from 83xx_wst: Florian Schirmer <jolt@tuxbox.org> |
| 7 | * ..and from sc520_wdt |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 8 | * Copyright (c) 2008 MontaVista Software, Inc. |
| 9 | * Anton Vorontsov <avorontsov@ru.mvista.com> |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 10 | * |
| 11 | * Note: it appears that you can only actually ENABLE or DISABLE the thing |
| 12 | * once after POR. Once enabled, you cannot disable, and vice versa. |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify it |
| 15 | * under the terms of the GNU General Public License as published by the |
| 16 | * Free Software Foundation; either version 2 of the License, or (at your |
| 17 | * option) any later version. |
| 18 | */ |
| 19 | |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 20 | #include <linux/fs.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/kernel.h> |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 23 | #include <linux/timer.h> |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 24 | #include <linux/miscdevice.h> |
Anton Vorontsov | ef8ab12 | 2008-07-03 23:51:32 -0700 | [diff] [blame] | 25 | #include <linux/of_platform.h> |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 26 | #include <linux/module.h> |
| 27 | #include <linux/watchdog.h> |
Alan Cox | f26ef3d | 2008-05-19 14:07:09 +0100 | [diff] [blame] | 28 | #include <linux/io.h> |
| 29 | #include <linux/uaccess.h> |
Anton Vorontsov | ef8ab12 | 2008-07-03 23:51:32 -0700 | [diff] [blame] | 30 | #include <sysdev/fsl_soc.h> |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 31 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 32 | struct mpc8xxx_wdt { |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 33 | __be32 res0; |
| 34 | __be32 swcrr; /* System watchdog control register */ |
| 35 | #define SWCRR_SWTC 0xFFFF0000 /* Software Watchdog Time Count. */ |
| 36 | #define SWCRR_SWEN 0x00000004 /* Watchdog Enable bit. */ |
| 37 | #define SWCRR_SWRI 0x00000002 /* Software Watchdog Reset/Interrupt Select bit.*/ |
| 38 | #define SWCRR_SWPR 0x00000001 /* Software Watchdog Counter Prescale bit. */ |
| 39 | __be32 swcnr; /* System watchdog count register */ |
| 40 | u8 res1[2]; |
| 41 | __be16 swsrr; /* System watchdog service register */ |
| 42 | u8 res2[0xF0]; |
| 43 | }; |
| 44 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 45 | struct mpc8xxx_wdt_type { |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 46 | int prescaler; |
| 47 | bool hw_enabled; |
| 48 | }; |
| 49 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 50 | static struct mpc8xxx_wdt __iomem *wd_base; |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 51 | |
| 52 | static u16 timeout = 0xffff; |
| 53 | module_param(timeout, ushort, 0); |
Alan Cox | f26ef3d | 2008-05-19 14:07:09 +0100 | [diff] [blame] | 54 | MODULE_PARM_DESC(timeout, |
| 55 | "Watchdog timeout in ticks. (0<timeout<65536, default=65535"); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 56 | |
| 57 | static int reset = 1; |
| 58 | module_param(reset, bool, 0); |
Alan Cox | f26ef3d | 2008-05-19 14:07:09 +0100 | [diff] [blame] | 59 | MODULE_PARM_DESC(reset, |
| 60 | "Watchdog Interrupt/Reset Mode. 0 = interrupt, 1 = reset"); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 61 | |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 62 | static int nowayout = WATCHDOG_NOWAYOUT; |
| 63 | module_param(nowayout, int, 0); |
| 64 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started " |
| 65 | "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
| 66 | |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 67 | /* |
| 68 | * We always prescale, but if someone really doesn't want to they can set this |
| 69 | * to 0 |
| 70 | */ |
| 71 | static int prescale = 1; |
| 72 | static unsigned int timeout_sec; |
| 73 | |
| 74 | static unsigned long wdt_is_open; |
Alexey Dobriyan | c7dfd0c | 2007-11-01 16:27:08 -0700 | [diff] [blame] | 75 | static DEFINE_SPINLOCK(wdt_spinlock); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 76 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 77 | static void mpc8xxx_wdt_keepalive(void) |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 78 | { |
| 79 | /* Ping the WDT */ |
| 80 | spin_lock(&wdt_spinlock); |
| 81 | out_be16(&wd_base->swsrr, 0x556c); |
| 82 | out_be16(&wd_base->swsrr, 0xaa39); |
| 83 | spin_unlock(&wdt_spinlock); |
| 84 | } |
| 85 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 86 | static void mpc8xxx_wdt_timer_ping(unsigned long arg); |
| 87 | static DEFINE_TIMER(wdt_timer, mpc8xxx_wdt_timer_ping, 0, 0); |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 88 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 89 | static void mpc8xxx_wdt_timer_ping(unsigned long arg) |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 90 | { |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 91 | mpc8xxx_wdt_keepalive(); |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 92 | /* We're pinging it twice faster than needed, just to be sure. */ |
| 93 | mod_timer(&wdt_timer, jiffies + HZ * timeout_sec / 2); |
| 94 | } |
| 95 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 96 | static void mpc8xxx_wdt_pr_warn(const char *msg) |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 97 | { |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 98 | pr_crit("mpc8xxx_wdt: %s, expect the %s soon!\n", msg, |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 99 | reset ? "reset" : "machine check exception"); |
| 100 | } |
| 101 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 102 | static ssize_t mpc8xxx_wdt_write(struct file *file, const char __user *buf, |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 103 | size_t count, loff_t *ppos) |
| 104 | { |
| 105 | if (count) |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 106 | mpc8xxx_wdt_keepalive(); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 107 | return count; |
| 108 | } |
| 109 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 110 | static int mpc8xxx_wdt_open(struct inode *inode, struct file *file) |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 111 | { |
| 112 | u32 tmp = SWCRR_SWEN; |
| 113 | if (test_and_set_bit(0, &wdt_is_open)) |
| 114 | return -EBUSY; |
| 115 | |
| 116 | /* Once we start the watchdog we can't stop it */ |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 117 | if (nowayout) |
| 118 | __module_get(THIS_MODULE); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 119 | |
| 120 | /* Good, fire up the show */ |
| 121 | if (prescale) |
| 122 | tmp |= SWCRR_SWPR; |
| 123 | if (reset) |
| 124 | tmp |= SWCRR_SWRI; |
| 125 | |
| 126 | tmp |= timeout << 16; |
| 127 | |
| 128 | out_be32(&wd_base->swcrr, tmp); |
| 129 | |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 130 | del_timer_sync(&wdt_timer); |
| 131 | |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 132 | return nonseekable_open(inode, file); |
| 133 | } |
| 134 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 135 | static int mpc8xxx_wdt_release(struct inode *inode, struct file *file) |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 136 | { |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 137 | if (!nowayout) |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 138 | mpc8xxx_wdt_timer_ping(0); |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 139 | else |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 140 | mpc8xxx_wdt_pr_warn("watchdog closed"); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 141 | clear_bit(0, &wdt_is_open); |
| 142 | return 0; |
| 143 | } |
| 144 | |
Anton Vorontsov | cb55d28 | 2008-07-03 23:51:36 -0700 | [diff] [blame] | 145 | static long mpc8xxx_wdt_ioctl(struct file *file, unsigned int cmd, |
Alan Cox | f26ef3d | 2008-05-19 14:07:09 +0100 | [diff] [blame] | 146 | unsigned long arg) |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 147 | { |
| 148 | void __user *argp = (void __user *)arg; |
| 149 | int __user *p = argp; |
| 150 | static struct watchdog_info ident = { |
| 151 | .options = WDIOF_KEEPALIVEPING, |
| 152 | .firmware_version = 1, |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 153 | .identity = "MPC8xxx", |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 154 | }; |
| 155 | |
| 156 | switch (cmd) { |
| 157 | case WDIOC_GETSUPPORT: |
| 158 | return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; |
Wim Van Sebroeck | 5c4eb61 | 2007-07-21 13:42:18 +0000 | [diff] [blame] | 159 | case WDIOC_GETSTATUS: |
| 160 | case WDIOC_GETBOOTSTATUS: |
| 161 | return put_user(0, p); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 162 | case WDIOC_KEEPALIVE: |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 163 | mpc8xxx_wdt_keepalive(); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 164 | return 0; |
| 165 | case WDIOC_GETTIMEOUT: |
| 166 | return put_user(timeout_sec, p); |
| 167 | default: |
Samuel Tardieu | 795b89d | 2006-09-09 17:34:31 +0200 | [diff] [blame] | 168 | return -ENOTTY; |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 169 | } |
| 170 | } |
| 171 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 172 | static const struct file_operations mpc8xxx_wdt_fops = { |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 173 | .owner = THIS_MODULE, |
| 174 | .llseek = no_llseek, |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 175 | .write = mpc8xxx_wdt_write, |
| 176 | .unlocked_ioctl = mpc8xxx_wdt_ioctl, |
| 177 | .open = mpc8xxx_wdt_open, |
| 178 | .release = mpc8xxx_wdt_release, |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 179 | }; |
| 180 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 181 | static struct miscdevice mpc8xxx_wdt_miscdev = { |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 182 | .minor = WATCHDOG_MINOR, |
| 183 | .name = "watchdog", |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 184 | .fops = &mpc8xxx_wdt_fops, |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 185 | }; |
| 186 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 187 | static int __devinit mpc8xxx_wdt_probe(struct of_device *ofdev, |
Anton Vorontsov | ef8ab12 | 2008-07-03 23:51:32 -0700 | [diff] [blame] | 188 | const struct of_device_id *match) |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 189 | { |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 190 | int ret; |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 191 | struct device_node *np = ofdev->node; |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 192 | struct mpc8xxx_wdt_type *wdt_type = match->data; |
Anton Vorontsov | ef8ab12 | 2008-07-03 23:51:32 -0700 | [diff] [blame] | 193 | u32 freq = fsl_get_sys_freq(); |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 194 | bool enabled; |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 195 | |
Anton Vorontsov | ef8ab12 | 2008-07-03 23:51:32 -0700 | [diff] [blame] | 196 | if (!freq || freq == -1) |
| 197 | return -EINVAL; |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 198 | |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 199 | wd_base = of_iomap(np, 0); |
Anton Vorontsov | ef8ab12 | 2008-07-03 23:51:32 -0700 | [diff] [blame] | 200 | if (!wd_base) |
| 201 | return -ENOMEM; |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 202 | |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 203 | enabled = in_be32(&wd_base->swcrr) & SWCRR_SWEN; |
| 204 | if (!enabled && wdt_type->hw_enabled) { |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 205 | pr_info("mpc8xxx_wdt: could not be enabled in software\n"); |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 206 | ret = -ENOSYS; |
| 207 | goto err_unmap; |
| 208 | } |
| 209 | |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 210 | /* Calculate the timeout in seconds */ |
| 211 | if (prescale) |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 212 | timeout_sec = (timeout * wdt_type->prescaler) / freq; |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 213 | else |
Anton Vorontsov | ef8ab12 | 2008-07-03 23:51:32 -0700 | [diff] [blame] | 214 | timeout_sec = timeout / freq; |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 215 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 216 | pr_info("WDT driver for MPC8xxx initialized. mode:%s timeout=%d " |
Anton Vorontsov | ef8ab12 | 2008-07-03 23:51:32 -0700 | [diff] [blame] | 217 | "(%d seconds)\n", reset ? "reset" : "interrupt", timeout, |
| 218 | timeout_sec); |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 219 | |
| 220 | /* |
| 221 | * If the watchdog was previously enabled or we're running on |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 222 | * MPC8xxx, we should ping the wdt from the kernel until the |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 223 | * userspace handles it. |
| 224 | */ |
| 225 | if (enabled) |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 226 | mpc8xxx_wdt_timer_ping(0); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 227 | return 0; |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 228 | err_unmap: |
| 229 | iounmap(wd_base); |
Anton Vorontsov | 0d7b101 | 2008-07-03 23:51:36 -0700 | [diff] [blame^] | 230 | wd_base = NULL; |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 231 | return ret; |
| 232 | } |
| 233 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 234 | static int __devexit mpc8xxx_wdt_remove(struct of_device *ofdev) |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 235 | { |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 236 | mpc8xxx_wdt_pr_warn("watchdog removed"); |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 237 | del_timer_sync(&wdt_timer); |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 238 | misc_deregister(&mpc8xxx_wdt_miscdev); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 239 | iounmap(wd_base); |
| 240 | |
| 241 | return 0; |
| 242 | } |
| 243 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 244 | static const struct of_device_id mpc8xxx_wdt_match[] = { |
Anton Vorontsov | ef8ab12 | 2008-07-03 23:51:32 -0700 | [diff] [blame] | 245 | { |
| 246 | .compatible = "mpc83xx_wdt", |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 247 | .data = &(struct mpc8xxx_wdt_type) { |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 248 | .prescaler = 0x10000, |
| 249 | }, |
| 250 | }, |
| 251 | { |
| 252 | .compatible = "fsl,mpc8610-wdt", |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 253 | .data = &(struct mpc8xxx_wdt_type) { |
Anton Vorontsov | 500c919 | 2008-07-03 23:51:34 -0700 | [diff] [blame] | 254 | .prescaler = 0x10000, |
| 255 | .hw_enabled = true, |
| 256 | }, |
Anton Vorontsov | ef8ab12 | 2008-07-03 23:51:32 -0700 | [diff] [blame] | 257 | }, |
Anton Vorontsov | 0d7b101 | 2008-07-03 23:51:36 -0700 | [diff] [blame^] | 258 | { |
| 259 | .compatible = "fsl,mpc823-wdt", |
| 260 | .data = &(struct mpc8xxx_wdt_type) { |
| 261 | .prescaler = 0x800, |
| 262 | }, |
| 263 | }, |
Anton Vorontsov | ef8ab12 | 2008-07-03 23:51:32 -0700 | [diff] [blame] | 264 | {}, |
| 265 | }; |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 266 | MODULE_DEVICE_TABLE(of, mpc8xxx_wdt_match); |
Anton Vorontsov | ef8ab12 | 2008-07-03 23:51:32 -0700 | [diff] [blame] | 267 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 268 | static struct of_platform_driver mpc8xxx_wdt_driver = { |
| 269 | .match_table = mpc8xxx_wdt_match, |
| 270 | .probe = mpc8xxx_wdt_probe, |
| 271 | .remove = __devexit_p(mpc8xxx_wdt_remove), |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 272 | .driver = { |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 273 | .name = "mpc8xxx_wdt", |
Kay Sievers | f37d193 | 2008-04-10 21:29:23 -0700 | [diff] [blame] | 274 | .owner = THIS_MODULE, |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 275 | }, |
| 276 | }; |
| 277 | |
Anton Vorontsov | 0d7b101 | 2008-07-03 23:51:36 -0700 | [diff] [blame^] | 278 | /* |
| 279 | * We do wdt initialization in two steps: arch_initcall probes the wdt |
| 280 | * very early to start pinging the watchdog (misc devices are not yet |
| 281 | * available), and later module_init() just registers the misc device. |
| 282 | */ |
| 283 | static int __init mpc8xxx_wdt_init_late(void) |
| 284 | { |
| 285 | int ret; |
| 286 | |
| 287 | if (!wd_base) |
| 288 | return -ENODEV; |
| 289 | |
| 290 | ret = misc_register(&mpc8xxx_wdt_miscdev); |
| 291 | if (ret) { |
| 292 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
| 293 | WATCHDOG_MINOR, ret); |
| 294 | return ret; |
| 295 | } |
| 296 | return 0; |
| 297 | } |
| 298 | module_init(mpc8xxx_wdt_init_late); |
| 299 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 300 | static int __init mpc8xxx_wdt_init(void) |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 301 | { |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 302 | return of_register_platform_driver(&mpc8xxx_wdt_driver); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 303 | } |
Anton Vorontsov | 0d7b101 | 2008-07-03 23:51:36 -0700 | [diff] [blame^] | 304 | arch_initcall(mpc8xxx_wdt_init); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 305 | |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 306 | static void __exit mpc8xxx_wdt_exit(void) |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 307 | { |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 308 | of_unregister_platform_driver(&mpc8xxx_wdt_driver); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 309 | } |
Anton Vorontsov | 59ca1b0 | 2008-07-03 23:51:35 -0700 | [diff] [blame] | 310 | module_exit(mpc8xxx_wdt_exit); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 311 | |
| 312 | MODULE_AUTHOR("Dave Updegraff, Kumar Gala"); |
Anton Vorontsov | 0d7b101 | 2008-07-03 23:51:36 -0700 | [diff] [blame^] | 313 | MODULE_DESCRIPTION("Driver for watchdog timer in MPC8xx/MPC83xx/MPC86xx " |
| 314 | "uProcessors"); |
Kumar Gala | fabbfb9 | 2006-01-14 13:20:50 -0800 | [diff] [blame] | 315 | MODULE_LICENSE("GPL"); |
| 316 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |