arch/x86/kernel/reboot_fixups_32.c

   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
  17 static 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
  26 static 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
  33 static 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
  46 static 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
  56 struct 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
  67 static 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  */
  81 void 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