/* * linux/arch/i386/kernel/reboot_fixups.c * * This is a good place to put board specific reboot fixups. * * List of supported fixups: * geode-gx1/cs5530a - Jaya Kumar * geode-gx/lx/cs5536 - Andres Salomon * */ #include #include #include #include #include static void cs5530a_warm_reset(struct pci_dev *dev) { /* writing 1 to the reset control register, 0x44 causes the cs5530a to perform a system warm reset */ pci_write_config_byte(dev, 0x44, 0x1); udelay(50); /* shouldn't get here but be safe and spin-a-while */ return; } static void cs5536_warm_reset(struct pci_dev *dev) { /* * 6.6.2.12 Soft Reset (DIVIL_SOFT_RESET) * writing 1 to the LSB of this MSR causes a hard reset. */ wrmsrl(0x51400017, 1ULL); udelay(50); /* shouldn't get here but be safe and spin a while */ } struct device_fixup { unsigned int vendor; unsigned int device; void (*reboot_fixup)(struct pci_dev *); }; static struct device_fixup fixups_table[] = { { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset }, { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset }, }; /* * we see if any fixup is available for our current hardware. if there * is a fixup, we call it and we expect to never return from it. if we * do return, we keep looking and then eventually fall back to the * standard mach_reboot on return. */ void mach_reboot_fixups(void) { struct device_fixup *cur; struct pci_dev *dev; int i; /* we can be called from sysrq-B code. In such a case it is * prohibited to dig PCI */ if (in_interrupt()) return; for (i=0; i < ARRAY_SIZE(fixups_table); i++) { cur = &(fixups_table[i]); dev = pci_get_device(cur->vendor, cur->device, NULL); if (!dev) continue; cur->reboot_fixup(dev); } }