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 16 static void cs5530a_warm_reset(struct pci_dev *dev) 17 { 18 /* writing 1 to the reset control register, 0x44 causes the 19 cs5530a to perform a system warm reset */ 20 pci_write_config_byte(dev, 0x44, 0x1); 21 udelay(50); /* shouldn't get here but be safe and spin-a-while */ 22 return; 23 } 24 25 static void cs5536_warm_reset(struct pci_dev *dev) 26 { 27 /* 28 * 6.6.2.12 Soft Reset (DIVIL_SOFT_RESET) 29 * writing 1 to the LSB of this MSR causes a hard reset. 30 */ 31 wrmsrl(0x51400017, 1ULL); 32 udelay(50); /* shouldn't get here but be safe and spin a while */ 33 } 34 35 struct device_fixup { 36 unsigned int vendor; 37 unsigned int device; 38 void (*reboot_fixup)(struct pci_dev *); 39 }; 40 41 static struct device_fixup fixups_table[] = { 42 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset }, 43 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset }, 44 }; 45 46 /* 47 * we see if any fixup is available for our current hardware. if there 48 * is a fixup, we call it and we expect to never return from it. if we 49 * do return, we keep looking and then eventually fall back to the 50 * standard mach_reboot on return. 51 */ 52 void mach_reboot_fixups(void) 53 { 54 struct device_fixup *cur; 55 struct pci_dev *dev; 56 int i; 57 58 /* we can be called from sysrq-B code. In such a case it is 59 * prohibited to dig PCI */ 60 if (in_interrupt()) 61 return; 62 63 for (i=0; i < ARRAY_SIZE(fixups_table); i++) { 64 cur = &(fixups_table[i]); 65 dev = pci_get_device(cur->vendor, cur->device, NULL); 66 if (!dev) 67 continue; 68 69 cur->reboot_fixup(dev); 70 } 71 } 72 73