1 /* 2 * linux/arch/i386/kernel/reboot_fixups.c 3 * 4 * This is a good place to put board specific reboot fixups. 5 * 6 * List of supported fixups: 7 * geode-gx1/cs5530a - Jaya Kumar <jayalk@intworks.biz> 8 * geode-gx/lx/cs5536 - Andres Salomon <dilinger@debian.org> 9 * 10 */ 11 12 #include <asm/delay.h> 13 #include <linux/pci.h> 14 #include <asm/reboot_fixups.h> 15 #include <asm/msr.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 /* 29 * 6.6.2.12 Soft Reset (DIVIL_SOFT_RESET) 30 * writing 1 to the LSB of this MSR causes a hard reset. 31 */ 32 wrmsrl(0x51400017, 1ULL); 33 udelay(50); /* shouldn't get here but be safe and spin a while */ 34 } 35 36 struct device_fixup { 37 unsigned int vendor; 38 unsigned int device; 39 void (*reboot_fixup)(struct pci_dev *); 40 }; 41 42 static struct device_fixup fixups_table[] = { 43 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset }, 44 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset }, 45 }; 46 47 /* 48 * we see if any fixup is available for our current hardware. if there 49 * is a fixup, we call it and we expect to never return from it. if we 50 * do return, we keep looking and then eventually fall back to the 51 * standard mach_reboot on return. 52 */ 53 void mach_reboot_fixups(void) 54 { 55 struct device_fixup *cur; 56 struct pci_dev *dev; 57 int i; 58 59 for (i=0; i < ARRAY_SIZE(fixups_table); i++) { 60 cur = &(fixups_table[i]); 61 dev = pci_get_device(cur->vendor, cur->device, NULL); 62 if (!dev) 63 continue; 64 65 cur->reboot_fixup(dev); 66 } 67 } 68 69