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 } 102 103