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 <linux/cs5535.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
  46static void ce4100_reset(struct pci_dev *dev)
  47{
  48        int i;
  49
  50        for (i = 0; i < 10; i++) {
  51                outb(0x2, 0xcf9);
  52                udelay(50);
  53        }
  54}
  55
  56struct device_fixup {
  57        unsigned int vendor;
  58        unsigned int device;
  59        void (*reboot_fixup)(struct pci_dev *);
  60};
  61
  62/*
  63 * PCI ids solely used for fixups_table go here
  64 */
  65#define PCI_DEVICE_ID_INTEL_CE4100      0x0708
  66
  67static const struct device_fixup fixups_table[] = {
  68{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset },
  69{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset },
  70{ PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE, cs5530a_warm_reset },
  71{ PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030, rdc321x_reset },
  72{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CE4100, ce4100_reset },
  73};
  74
  75/*
  76 * we see if any fixup is available for our current hardware. if there
  77 * is a fixup, we call it and we expect to never return from it. if we
  78 * do return, we keep looking and then eventually fall back to the
  79 * standard mach_reboot on return.
  80 */
  81void mach_reboot_fixups(void)
  82{
  83        const struct device_fixup *cur;
  84        struct pci_dev *dev;
  85        int i;
  86
  87        /* we can be called from sysrq-B code. In such a case it is
  88         * prohibited to dig PCI */
  89        if (in_interrupt())
  90                return;
  91
  92        for (i=0; i < ARRAY_SIZE(fixups_table); i++) {
  93                cur = &(fixups_table[i]);
  94                dev = pci_get_device(cur->vendor, cur->device, NULL);
  95                if (!dev)
  96                        continue;
  97
  98                cur->reboot_fixup(dev);
  99                pci_dev_put(dev);
 100        }
 101}
 102
 103