LXR linux/arch/x86/kernel/reboot_fixups

   1/*
   2 * This is a good place to put board specific reboot fixups.
   3 *
   4 * List of supported fixups:
   5 * geode-gx1/cs5530a - Jaya Kumar <jayalk@intworks.biz>
   6 * geode-gx/lx/cs5536 - Andres Salomon <dilinger@debian.org>
   7 *
   8 */
   9
  10#include <asm/delay.h>
  11#include <linux/pci.h>
  12#include <linux/interrupt.h>
  13#include <asm/reboot_fixups.h>
  14#include <asm/msr.h>
  15#include <asm/geode.h>
  16
  17static void cs5530a_warm_reset(struct pci_dev *dev)
  18{
  19        /* writing 1 to the reset control register, 0x44 causes the
  20        cs5530a to perform a system warm reset */
  21        pci_write_config_byte(dev, 0x44, 0x1);
  22        udelay(50); /* shouldn't get here but be safe and spin-a-while */
  23        return;
  24}
  25
  26static void cs5536_warm_reset(struct pci_dev *dev)
  27{
  28        /* writing 1 to the LSB of this MSR causes a hard reset */
  29        wrmsrl(MSR_DIVIL_SOFT_RESET, 1ULL);
  30        udelay(50); /* shouldn't get here but be safe and spin a while */
  31}
  32
  33static void rdc321x_reset(struct pci_dev *dev)
  34{
  35        unsigned i;
  36        /* Voluntary reset the watchdog timer */
  37        outl(0x80003840, 0xCF8);
  38        /* Generate a CPU reset on next tick */
  39        i = inl(0xCFC);
  40        /* Use the minimum timer resolution */
  41        i |= 0x1600;
  42        outl(i, 0xCFC);
  43        outb(1, 0x92);
  44}
  45
  46struct device_fixup {
  47        unsigned int vendor;
  48        unsigned int device;
  49        void (*reboot_fixup)(struct pci_dev *);
  50};
  51
  52static const struct device_fixup fixups_table[] = {
  53{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset },
  54{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset },
  55{ PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE, cs5530a_warm_reset },
  56{ PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030, rdc321x_reset },
  57};
  58
  59/*
  60 * we see if any fixup is available for our current hardware. if there
  61 * is a fixup, we call it and we expect to never return from it. if we
  62 * do return, we keep looking and then eventually fall back to the
  63 * standard mach_reboot on return.
  64 */
  65void mach_reboot_fixups(void)
  66{
  67        const struct device_fixup *cur;
  68        struct pci_dev *dev;
  69        int i;
  70
  71        /* we can be called from sysrq-B code. In such a case it is
  72         * prohibited to dig PCI */
  73        if (in_interrupt())
  74                return;
  75
  76        for (i=0; i < ARRAY_SIZE(fixups_table); i++) {
  77                cur = &(fixups_table[i]);
  78                dev = pci_get_device(cur->vendor, cur->device, NULL);
  79                if (!dev)
  80                        continue;
  81
  82                cur->reboot_fixup(dev);
  83        }
  84}
  85
  86