blob: 93f91142d7ad5ca01fc62b8dc16569660cfa0434 [file] [log] [blame]
Aaron Durbin4d387042008-07-16 23:27:08 +02001
2#include <linux/pci.h>
3#include <linux/acpi.h>
4#include <acpi/reboot.h>
5
6void 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
Len Brownd17cb182008-11-06 20:51:59 -050018 /* Is the reset register supported? */
19 if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) ||
20 rr->bit_width != 8 || rr->bit_offset != 0)
Aaron Durbin4d387042008-07-16 23:27:08 +020021 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");
Lin Ming2ee626122008-12-16 16:40:31 +080045 acpi_reset();
Aaron Durbin4d387042008-07-16 23:27:08 +020046 break;
47 }
48 /* Wait ten seconds */
49 acpi_os_stall(10000000);
50}