| Aaron Durbin | 4d38704 | 2008-07-16 23:27:08 +0200 | [diff] [blame^] | 1 | |
| 2 | #include <linux/pci.h> |
| 3 | #include <linux/acpi.h> |
| 4 | #include <acpi/reboot.h> |
| 5 | |
| 6 | void acpi_reboot(void) |
| 7 | { |
| 8 | struct acpi_generic_address *rr; |
| 9 | struct pci_bus *bus0; |
| 10 | u8 reset_value; |
| 11 | unsigned int devfn; |
| 12 | |
| 13 | if (acpi_disabled) |
| 14 | return; |
| 15 | |
| 16 | rr = &acpi_gbl_FADT.reset_register; |
| 17 | |
| 18 | /* Is the reset register supported? */ |
| 19 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) || |
| 20 | rr->bit_width != 8 || rr->bit_offset != 0) |
| 21 | return; |
| 22 | |
| 23 | reset_value = acpi_gbl_FADT.reset_value; |
| 24 | |
| 25 | /* The reset register can only exist in I/O, Memory or PCI config space |
| 26 | * on a device on bus 0. */ |
| 27 | switch (rr->space_id) { |
| 28 | case ACPI_ADR_SPACE_PCI_CONFIG: |
| 29 | /* The reset register can only live on bus 0. */ |
| 30 | bus0 = pci_find_bus(0, 0); |
| 31 | if (!bus0) |
| 32 | return; |
| 33 | /* Form PCI device/function pair. */ |
| 34 | devfn = PCI_DEVFN((rr->address >> 32) & 0xffff, |
| 35 | (rr->address >> 16) & 0xffff); |
| 36 | printk(KERN_DEBUG "Resetting with ACPI PCI RESET_REG."); |
| 37 | /* Write the value that resets us. */ |
| 38 | pci_bus_write_config_byte(bus0, devfn, |
| 39 | (rr->address & 0xffff), reset_value); |
| 40 | break; |
| 41 | |
| 42 | case ACPI_ADR_SPACE_SYSTEM_MEMORY: |
| 43 | case ACPI_ADR_SPACE_SYSTEM_IO: |
| 44 | printk(KERN_DEBUG "ACPI MEMORY or I/O RESET_REG.\n"); |
| 45 | acpi_hw_low_level_write(8, reset_value, rr); |
| 46 | break; |
| 47 | } |
| 48 | /* Wait ten seconds */ |
| 49 | acpi_os_stall(10000000); |
| 50 | } |