Commit | Line | Data |
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4d387043 AD |
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 | ||
95cf3e12 MG |
18 | /* ACPI reset register was only introduced with v2 of the FADT */ |
19 | ||
20 | if (acpi_gbl_FADT.header.revision < 2) | |
21 | return; | |
22 | ||
6734fe57 MG |
23 | /* Is the reset register supported? The spec says we should be |
24 | * checking the bit width and bit offset, but Windows ignores | |
25 | * these fields */ | |
19244ad0 LT |
26 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)) |
27 | return; | |
4d387043 AD |
28 | |
29 | reset_value = acpi_gbl_FADT.reset_value; | |
30 | ||
31 | /* The reset register can only exist in I/O, Memory or PCI config space | |
32 | * on a device on bus 0. */ | |
33 | switch (rr->space_id) { | |
34 | case ACPI_ADR_SPACE_PCI_CONFIG: | |
35 | /* The reset register can only live on bus 0. */ | |
36 | bus0 = pci_find_bus(0, 0); | |
37 | if (!bus0) | |
38 | return; | |
39 | /* Form PCI device/function pair. */ | |
40 | devfn = PCI_DEVFN((rr->address >> 32) & 0xffff, | |
41 | (rr->address >> 16) & 0xffff); | |
42 | printk(KERN_DEBUG "Resetting with ACPI PCI RESET_REG."); | |
43 | /* Write the value that resets us. */ | |
44 | pci_bus_write_config_byte(bus0, devfn, | |
45 | (rr->address & 0xffff), reset_value); | |
46 | break; | |
47 | ||
48 | case ACPI_ADR_SPACE_SYSTEM_MEMORY: | |
49 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
50 | printk(KERN_DEBUG "ACPI MEMORY or I/O RESET_REG.\n"); | |
2ee62612 | 51 | acpi_reset(); |
4d387043 AD |
52 | break; |
53 | } | |
4d387043 | 54 | } |