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authorBob Moore <robert.moore@intel.com>2011-11-16 06:57:28 +0400
committerLen Brown <len.brown@intel.com>2012-01-17 12:36:28 +0400
commit22e5b40ab21fcac21db0ff25fbb844ffecc73a4a (patch)
tree6fe339a8c410d2f8f2a0f844c976046d3be47e17 /drivers
parent2355e10f07b2c550c671f98b68aedf323c299aeb (diff)
downloadlinux-22e5b40ab21fcac21db0ff25fbb844ffecc73a4a.tar.xz
ACPI 5.0: Implement hardware-reduced option
If HW-reduced flag is set in the FADT, do not attempt to access or initialize any ACPI hardware, including SCI and global lock. No FACS will be present. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/acpi/acpica/acglobal.h13
-rw-r--r--drivers/acpi/acpica/evevent.c12
-rw-r--r--drivers/acpi/acpica/evglock.c6
-rw-r--r--drivers/acpi/acpica/tbfadt.c22
-rw-r--r--drivers/acpi/acpica/tbutils.c7
5 files changed, 57 insertions, 3 deletions
diff --git a/drivers/acpi/acpica/acglobal.h b/drivers/acpi/acpica/acglobal.h
index 76dc02f15574..25912a93dea7 100644
--- a/drivers/acpi/acpica/acglobal.h
+++ b/drivers/acpi/acpica/acglobal.h
@@ -140,8 +140,19 @@ u32 acpi_gbl_trace_flags;
acpi_name acpi_gbl_trace_method_name;
u8 acpi_gbl_system_awake_and_running;
+/*
+ * ACPI 5.0 introduces the concept of a "reduced hardware platform", meaning
+ * that the ACPI hardware is no longer required. A flag in the FADT indicates
+ * a reduced HW machine, and that flag is duplicated here for convenience.
+ */
+u8 acpi_gbl_reduced_hardware;
+
#endif
+/* Do not disassemble buffers to resource descriptors */
+
+ACPI_EXTERN u8 ACPI_INIT_GLOBAL(acpi_gbl_no_resource_disassembly, FALSE);
+
/*****************************************************************************
*
* Debug support
@@ -207,7 +218,7 @@ ACPI_EXTERN struct acpi_rw_lock acpi_gbl_namespace_rw_lock;
/*****************************************************************************
*
- * Mutual exlusion within ACPICA subsystem
+ * Mutual exclusion within ACPICA subsystem
*
****************************************************************************/
diff --git a/drivers/acpi/acpica/evevent.c b/drivers/acpi/acpica/evevent.c
index d458b041e651..1f43be470199 100644
--- a/drivers/acpi/acpica/evevent.c
+++ b/drivers/acpi/acpica/evevent.c
@@ -71,6 +71,12 @@ acpi_status acpi_ev_initialize_events(void)
ACPI_FUNCTION_TRACE(ev_initialize_events);
+ /* If Hardware Reduced flag is set, there are no fixed events */
+
+ if (acpi_gbl_reduced_hardware) {
+ return_ACPI_STATUS(AE_OK);
+ }
+
/*
* Initialize the Fixed and General Purpose Events. This is done prior to
* enabling SCIs to prevent interrupts from occurring before the handlers
@@ -111,6 +117,12 @@ acpi_status acpi_ev_install_xrupt_handlers(void)
ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers);
+ /* If Hardware Reduced flag is set, there is no ACPI h/w */
+
+ if (acpi_gbl_reduced_hardware) {
+ return_ACPI_STATUS(AE_OK);
+ }
+
/* Install the SCI handler */
status = acpi_ev_install_sci_handler();
diff --git a/drivers/acpi/acpica/evglock.c b/drivers/acpi/acpica/evglock.c
index 56a562a1e5d7..af1e71af1b64 100644
--- a/drivers/acpi/acpica/evglock.c
+++ b/drivers/acpi/acpica/evglock.c
@@ -70,6 +70,12 @@ acpi_status acpi_ev_init_global_lock_handler(void)
ACPI_FUNCTION_TRACE(ev_init_global_lock_handler);
+ /* If Hardware Reduced flag is set, there is no global lock */
+
+ if (acpi_gbl_reduced_hardware) {
+ return_ACPI_STATUS(AE_OK);
+ }
+
/* Attempt installation of the global lock handler */
status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,
diff --git a/drivers/acpi/acpica/tbfadt.c b/drivers/acpi/acpica/tbfadt.c
index 536fd2bc7a47..1e1a7de34439 100644
--- a/drivers/acpi/acpica/tbfadt.c
+++ b/drivers/acpi/acpica/tbfadt.c
@@ -253,8 +253,13 @@ void acpi_tb_parse_fadt(u32 table_index)
acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
- acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xfacs,
- ACPI_SIG_FACS, ACPI_TABLE_INDEX_FACS);
+ /* If Hardware Reduced flag is set, there is no FACS */
+
+ if (!acpi_gbl_reduced_hardware) {
+ acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.
+ Xfacs, ACPI_SIG_FACS,
+ ACPI_TABLE_INDEX_FACS);
+ }
}
/*******************************************************************************
@@ -297,6 +302,13 @@ void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
ACPI_MEMCPY(&acpi_gbl_FADT, table,
ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
+ /* Take a copy of the Hardware Reduced flag */
+
+ acpi_gbl_reduced_hardware = FALSE;
+ if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) {
+ acpi_gbl_reduced_hardware = TRUE;
+ }
+
/* Convert the local copy of the FADT to the common internal format */
acpi_tb_convert_fadt();
@@ -502,6 +514,12 @@ static void acpi_tb_validate_fadt(void)
acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
}
+ /* If Hardware Reduced flag is set, we are all done */
+
+ if (acpi_gbl_reduced_hardware) {
+ return;
+ }
+
/* Examine all of the 64-bit extended address fields (X fields) */
for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index 0f2d395feaba..da56a1908966 100644
--- a/drivers/acpi/acpica/tbutils.c
+++ b/drivers/acpi/acpica/tbutils.c
@@ -135,6 +135,13 @@ acpi_status acpi_tb_initialize_facs(void)
{
acpi_status status;
+ /* If Hardware Reduced flag is set, there is no FACS */
+
+ if (acpi_gbl_reduced_hardware) {
+ acpi_gbl_FACS = NULL;
+ return (AE_OK);
+ }
+
status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
ACPI_CAST_INDIRECT_PTR(struct
acpi_table_header,