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 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 struct device_fixup { 34 unsigned int vendor; 35 unsigned int device; 36 void (*reboot_fixup)(struct pci_dev *); 37 }; 38 39 static struct device_fixup fixups_table[] = { 40 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset }, 41 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset }, 42 { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE, cs5530a_warm_reset }, 43 }; 44 45 /* 46 * we see if any fixup is available for our current hardware. if there 47 * is a fixup, we call it and we expect to never return from it. if we 48 * do return, we keep looking and then eventually fall back to the 49 * standard mach_reboot on return. 50 */ 51 void mach_reboot_fixups(void) 52 { 53 struct device_fixup *cur; 54 struct pci_dev *dev; 55 int i; 56 57 /* we can be called from sysrq-B code. In such a case it is 58 * prohibited to dig PCI */ 59 if (in_interrupt()) 60 return; 61 62 for (i=0; i < ARRAY_SIZE(fixups_table); i++) { 63 cur = &(fixups_table[i]); 64 dev = pci_get_device(cur->vendor, cur->device, NULL); 65 if (!dev) 66 continue; 67 68 cur->reboot_fixup(dev); 69 } 70 } 71 72