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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 | ||
d17cb18a LB |
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) | |
4d387043 AD |
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 | } |