target/linux/lantiq/patches/250-watchdog.patch

   1 --- a/drivers/watchdog/Kconfig
   2 +++ b/drivers/watchdog/Kconfig
   3 @@ -840,6 +840,12 @@ config TXX9_WDT
   4         help
   5           Hardware driver for the built-in watchdog timer on TXx9 MIPS SoCs.
   6
   7 +config LANTIQ_WDT
   8 +       bool "Lantiq SoC watchdog"
   9 +       depends on LANTIQ
  10 +       help
  11 +         Hardware driver for the Lantiq SoC Watchdog Timer.
  12 +
  13  # PARISC Architecture
  14
  15  # POWERPC Architecture
  16 --- a/drivers/watchdog/Makefile
  17 +++ b/drivers/watchdog/Makefile
  18 @@ -112,6 +112,7 @@ obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt
  19  obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
  20  obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
  21  obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
  22 +obj-$(CONFIG_LANTIQ_WDT) += lantiq_wdt.o
  23
  24  # PARISC Architecture
  25
  26 --- /dev/null
  27 +++ b/drivers/watchdog/lantiq_wdt.c
  28 @@ -0,0 +1,218 @@
  29 +/*
  30 + *  This program is free software; you can redistribute it and/or modify it
  31 + *  under the terms of the GNU General Public License version 2 as published
  32 + *  by the Free Software Foundation.
  33 + *
  34 + *  Copyright (C) 2010 John Crispin <blogic@openwrt.org>
  35 + *  Based on EP93xx wdt driver
  36 + */
  37 +
  38 +#include <linux/module.h>
  39 +#include <linux/fs.h>
  40 +#include <linux/miscdevice.h>
  41 +#include <linux/miscdevice.h>
  42 +#include <linux/watchdog.h>
  43 +#include <linux/platform_device.h>
  44 +#include <linux/uaccess.h>
  45 +#include <linux/clk.h>
  46 +
  47 +#include <lantiq.h>
  48 +
  49 +#define LQ_WDT_PW1                     0x00BE0000
  50 +#define LQ_WDT_PW2                     0x00DC0000
  51 +
  52 +#define LQ_BIU_WDT_CR          0x3F0
  53 +#define LQ_BIU_WDT_SR          0x3F8
  54 +
  55 +#ifndef CONFIG_WATCHDOG_NOWAYOUT
  56 +static int wdt_ok_to_close;
  57 +#endif
  58 +
  59 +static int wdt_timeout = 30;
  60 +static __iomem void *wdt_membase = NULL;
  61 +static unsigned long io_region_clk = 0;
  62 +
  63 +static int
  64 +lq_wdt_enable(unsigned int timeout)
  65 +{
  66 +/*     printk("%s:%s[%d] %08X\n",
  67 +               __FILE__, __func__, __LINE__,
  68 +               lq_r32(wdt_membase + LQ_BIU_WDT_SR));
  69 +       if(!lq_r32(wdt_membase + LQ_BIU_WDT_SR))
  70 +       {
  71 +*/     lq_w32(LQ_WDT_PW1, wdt_membase + LQ_BIU_WDT_CR);
  72 +       lq_w32(LQ_WDT_PW2 |
  73 +               (0x3 << 26) | /* PWL */
  74 +               (0x3 << 24) | /* CLKDIV */
  75 +               (0x1 << 31) | /* enable */
  76 +               ((timeout * (io_region_clk / 0x40000)) + 0x1000), /* reload */
  77 +                       wdt_membase + LQ_BIU_WDT_CR);
  78 +//     }
  79 +       return 0;
  80 +}
  81 +
  82 +static void
  83 +lq_wdt_disable(void)
  84 +{
  85 +#ifndef CONFIG_WATCHDOG_NOWAYOUT
  86 +       wdt_ok_to_close = 0;
  87 +#endif
  88 +       lq_w32(LQ_WDT_PW1, wdt_membase + LQ_BIU_WDT_CR);
  89 +       lq_w32(LQ_WDT_PW2, wdt_membase+ LQ_BIU_WDT_CR);
  90 +}
  91 +
  92 +static ssize_t
  93 +lq_wdt_write(struct file *file, const char __user *data,
  94 +               size_t len, loff_t *ppos)
  95 +{
  96 +       size_t i;
  97 +
  98 +       if (!len)
  99 +               return 0;
 100 +
 101 +#ifndef CONFIG_WATCHDOG_NOWAYOUT
 102 +       for (i = 0; i != len; i++) {
 103 +               char c;
 104 +               if (get_user(c, data + i))
 105 +                       return -EFAULT;
 106 +               if (c == 'V')
 107 +                       wdt_ok_to_close = 1;
 108 +       }
 109 +#endif
 110 +       lq_wdt_enable(wdt_timeout);
 111 +       return len;
 112 +}
 113 +
 114 +static struct watchdog_info ident = {
 115 +       .options = WDIOF_MAGICCLOSE,
 116 +       .identity = "lq_wdt",
 117 +};
 118 +
 119 +static int
 120 +lq_wdt_ioctl(struct inode *inode, struct file *file,
 121 +               unsigned int cmd, unsigned long arg)
 122 +{
 123 +       int ret = -ENOTTY;
 124 +
 125 +       switch (cmd) {
 126 +       case WDIOC_GETSUPPORT:
 127 +               ret = copy_to_user((struct watchdog_info __user *)arg, &ident,
 128 +                               sizeof(ident)) ? -EFAULT : 0;
 129 +               break;
 130 +
 131 +       case WDIOC_GETTIMEOUT:
 132 +               ret = put_user(wdt_timeout, (int __user *)arg);
 133 +               break;
 134 +
 135 +       case WDIOC_SETTIMEOUT:
 136 +               ret = get_user(wdt_timeout, (int __user *)arg);
 137 +               break;
 138 +
 139 +       case WDIOC_KEEPALIVE:
 140 +               lq_wdt_enable(wdt_timeout);
 141 +               ret = 0;
 142 +               break;
 143 +       }
 144 +       return ret;
 145 +}
 146 +
 147 +static int
 148 +lq_wdt_open(struct inode *inode, struct file *file)
 149 +{
 150 +       lq_wdt_enable(wdt_timeout);
 151 +       return nonseekable_open(inode, file);
 152 +}
 153 +
 154 +static int
 155 +lq_wdt_release(struct inode *inode, struct file *file)
 156 +{
 157 +#ifndef CONFIG_WATCHDOG_NOWAYOUT
 158 +       if (wdt_ok_to_close)
 159 +               lq_wdt_disable();
 160 +       else
 161 +#endif
 162 +               printk(KERN_ERR "lq_wdt: watchdog closed without warning,"
 163 +                       " rebooting system\n");
 164 +       return 0;
 165 +}
 166 +
 167 +static const struct file_operations lq_wdt_fops = {
 168 +       .owner          = THIS_MODULE,
 169 +       .write          = lq_wdt_write,
 170 +       .ioctl          = lq_wdt_ioctl,
 171 +       .open           = lq_wdt_open,
 172 +       .release        = lq_wdt_release,
 173 +};
 174 +
 175 +static struct miscdevice lq_wdt_miscdev = {
 176 +       .minor          = WATCHDOG_MINOR,
 177 +       .name           = "watchdog",
 178 +       .fops           = &lq_wdt_fops,
 179 +};
 180 +
 181 +static int
 182 +lq_wdt_probe(struct platform_device *pdev)
 183 +{
 184 +       struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 185 +       struct clk *clk;
 186 +       int ret = 0;
 187 +       if(!res)
 188 +               return -ENOENT;
 189 +       res = request_mem_region(res->start, resource_size(res),
 190 +               dev_name(&pdev->dev));
 191 +       if(!res)
 192 +               return -EBUSY;
 193 +       wdt_membase = ioremap_nocache(res->start, resource_size(res));
 194 +       if(!wdt_membase)
 195 +       {
 196 +               ret = -ENOMEM;
 197 +               goto err_release_mem_region;
 198 +       }
 199 +       clk = clk_get(&pdev->dev, "io");
 200 +       io_region_clk = clk_get_rate(clk);;
 201 +       ret = misc_register(&lq_wdt_miscdev);
 202 +       if(!ret)
 203 +               return 0;
 204 +
 205 +       iounmap(wdt_membase);
 206 +err_release_mem_region:
 207 +       release_mem_region(res->start, resource_size(res));
 208 +       return ret;
 209 +}
 210 +
 211 +static int
 212 +lq_wdt_remove(struct platform_device *dev)
 213 +{
 214 +       lq_wdt_disable();
 215 +       misc_deregister(&lq_wdt_miscdev);
 216 +       return 0;
 217 +}
 218 +
 219 +static struct platform_driver lq_wdt_driver = {
 220 +       .probe = lq_wdt_probe,
 221 +       .remove = lq_wdt_remove,
 222 +       .driver = {
 223 +               .name = "lq_wdt",
 224 +               .owner = THIS_MODULE,
 225 +       },
 226 +};
 227 +
 228 +static int __init
 229 +init_lq_wdt(void)
 230 +{
 231 +       return platform_driver_register(&lq_wdt_driver);
 232 +}
 233 +
 234 +static void __exit
 235 +exit_lq_wdt(void)
 236 +{
 237 +       platform_driver_unregister(&lq_wdt_driver);
 238 +}
 239 +
 240 +module_init(init_lq_wdt);
 241 +module_exit(exit_lq_wdt);
 242 +
 243 +MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 244 +MODULE_DESCRIPTION("ifxmips Watchdog");
 245 +MODULE_LICENSE("GPL");
 246 +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);