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 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 pci_dev_put(dev); 84 } 85} 86