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