From 4d3870431d17346c4fdd80e087b7d76f1b5941d5 Mon Sep 17 00:00:00 2001 From: Aaron Durbin Date: Wed, 16 Jul 2008 23:27:08 +0200 Subject: Add the ability to reset the machine using the RESET_REG in ACPI's FADT table. Signed-off-by: Aaron Durbin Signed-off-by: Andi Kleen Cc: Len Brown Cc: Andi Kleen Signed-off-by: Andrew Morton --- drivers/acpi/Makefile | 2 +- drivers/acpi/reboot.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 51 insertions(+), 1 deletion(-) create mode 100644 drivers/acpi/reboot.c (limited to 'drivers/acpi') diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 40b0fcae4c7..4efbe598c81 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -21,7 +21,7 @@ obj-$(CONFIG_X86) += blacklist.o # # ACPI Core Subsystem (Interpreter) # -obj-y += osl.o utils.o \ +obj-y += osl.o utils.o reboot.o\ dispatcher/ events/ executer/ hardware/ \ namespace/ parser/ resources/ tables/ \ utilities/ diff --git a/drivers/acpi/reboot.c b/drivers/acpi/reboot.c new file mode 100644 index 00000000000..a6b662c00b6 --- /dev/null +++ b/drivers/acpi/reboot.c @@ -0,0 +1,50 @@ + +#include +#include +#include + +void acpi_reboot(void) +{ + struct acpi_generic_address *rr; + struct pci_bus *bus0; + u8 reset_value; + unsigned int devfn; + + if (acpi_disabled) + return; + + rr = &acpi_gbl_FADT.reset_register; + + /* Is the reset register supported? */ + if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) || + rr->bit_width != 8 || rr->bit_offset != 0) + return; + + reset_value = acpi_gbl_FADT.reset_value; + + /* The reset register can only exist in I/O, Memory or PCI config space + * on a device on bus 0. */ + switch (rr->space_id) { + case ACPI_ADR_SPACE_PCI_CONFIG: + /* The reset register can only live on bus 0. */ + bus0 = pci_find_bus(0, 0); + if (!bus0) + return; + /* Form PCI device/function pair. */ + devfn = PCI_DEVFN((rr->address >> 32) & 0xffff, + (rr->address >> 16) & 0xffff); + printk(KERN_DEBUG "Resetting with ACPI PCI RESET_REG."); + /* Write the value that resets us. */ + pci_bus_write_config_byte(bus0, devfn, + (rr->address & 0xffff), reset_value); + break; + + case ACPI_ADR_SPACE_SYSTEM_MEMORY: + case ACPI_ADR_SPACE_SYSTEM_IO: + printk(KERN_DEBUG "ACPI MEMORY or I/O RESET_REG.\n"); + acpi_hw_low_level_write(8, reset_value, rr); + break; + } + /* Wait ten seconds */ + acpi_os_stall(10000000); +} -- cgit v1.2.3