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>

1 files changed, 50 insertions, 0 deletions

diff --git a/drivers/acpi/reboot.c b/drivers/acpi/reboot.c
new file mode 100644
index 000000000000..a6b662c00b67
--- /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);
+}