arch/i386/kernel/reboot_fixups.c

   1 /*
   2  * linux/arch/i386/kernel/reboot_fixups.c
   3  *
   4  * This is a good place to put board specific reboot fixups.
   5  *
   6  * List of supported fixups:
   7  * geode-gx1/cs5530a - Jaya Kumar <jayalk@intworks.biz>
   8  *
   9  */
  10
  11 #include <asm/delay.h>
  12 #include <linux/pci.h>
  13 #include <linux/reboot_fixups.h>
  14
  15 static void cs5530a_warm_reset(struct pci_dev *dev)
  16 {
  17         /* writing 1 to the reset control register, 0x44 causes the
  18         cs5530a to perform a system warm reset */
  19         pci_write_config_byte(dev, 0x44, 0x1);
  20         udelay(50); /* shouldn't get here but be safe and spin-a-while */
  21         return;
  22 }
  23
  24 struct device_fixup {
  25         unsigned int vendor;
  26         unsigned int device;
  27         void (*reboot_fixup)(struct pci_dev *);
  28 };
  29
  30 static struct device_fixup fixups_table[] = {
  31 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset },
  32 };
  33
  34 /*
  35  * we see if any fixup is available for our current hardware. if there
  36  * is a fixup, we call it and we expect to never return from it. if we
  37  * do return, we keep looking and then eventually fall back to the
  38  * standard mach_reboot on return.
  39  */
  40 void mach_reboot_fixups(void)
  41 {
  42         struct device_fixup *cur;
  43         struct pci_dev *dev;
  44         int i;
  45
  46         for (i=0; i < ARRAY_SIZE(fixups_table); i++) {
  47                 cur = &(fixups_table[i]);
  48                 dev = pci_get_device(cur->vendor, cur->device, NULL);
  49                 if (!dev)
  50                         continue;
  51
  52                 cur->reboot_fixup(dev);
  53         }
  54 }
  55