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authorAaron Durbin <adurbin@google.com>2008-07-16 23:27:08 +0200
committerAndi Kleen <andi@basil.nowhere.org>2008-07-16 23:27:08 +0200
commit4d3870431d17346c4fdd80e087b7d76f1b5941d5 (patch)
treea8d3dcc5ab984ed7cbf67965372d58145bc90e9a /drivers/acpi/reboot.c
parentc83642d5123225a22cccd75adea6e97c245714cb (diff)
Add the ability to reset the machine using the RESET_REG in ACPI's FADT table.
Signed-off-by: Aaron Durbin <adurbin@google.com> Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Len Brown <lenb@kernel.org> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'drivers/acpi/reboot.c')
-rw-r--r--drivers/acpi/reboot.c50
1 files changed, 50 insertions, 0 deletions
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 <linux/pci.h>
+#include <linux/acpi.h>
+#include <acpi/reboot.h>
+
+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);
+}