static atomic_t c3_cpu_count;
+/* Common C-state entry for C2, C3, .. */
+static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
+{
+ if (cstate->space_id == ACPI_CSTATE_FFH) {
+ /* Call into architectural FFH based C-state */
+ acpi_processor_ffh_cstate_enter(cstate);
+ } else {
+ int unused;
+ /* IO port based C-state */
+ inb(cstate->address);
+ /* Dummy wait op - must do something useless after P_LVL2 read
+ because chipsets cannot guarantee that STPCLK# signal
+ gets asserted in time to freeze execution properly. */
+ unused = inl(acpi_fadt.xpm_tmr_blk.address);
+ }
+}
+
static void acpi_processor_idle(void)
{
struct acpi_processor *pr = NULL;
/* Get start time (ticks) */
t1 = inl(acpi_fadt.xpm_tmr_blk.address);
/* Invoke C2 */
- inb(cx->address);
- /* Dummy wait op - must do something useless after P_LVL2 read
- because chipsets cannot guarantee that STPCLK# signal
- gets asserted in time to freeze execution properly. */
- t2 = inl(acpi_fadt.xpm_tmr_blk.address);
+ acpi_cstate_enter(cx);
/* Get end time (ticks) */
t2 = inl(acpi_fadt.xpm_tmr_blk.address);
/* Get start time (ticks) */
t1 = inl(acpi_fadt.xpm_tmr_blk.address);
/* Invoke C3 */
- inb(cx->address);
- /* Dummy wait op (see above) */
- t2 = inl(acpi_fadt.xpm_tmr_blk.address);
+ acpi_cstate_enter(cx);
/* Get end time (ticks) */
t2 = inl(acpi_fadt.xpm_tmr_blk.address);
if (pr->flags.bm_check) {
return 0;
}
-static int acpi_processor_get_power_info_default_c1(struct acpi_processor *pr)
+static int acpi_processor_get_power_info_default(struct acpi_processor *pr)
{
-
- /* Zero initialize all the C-states info. */
- memset(pr->power.states, 0, sizeof(pr->power.states));
-
- /* set the first C-State to C1 */
- pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
-
- /* the C0 state only exists as a filler in our array,
- * and all processors need to support C1 */
+ if (!pr->power.states[ACPI_STATE_C1].valid) {
+ /* set the first C-State to C1 */
+ /* all processors need to support C1 */
+ pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
+ pr->power.states[ACPI_STATE_C1].valid = 1;
+ }
+ /* the C0 state only exists as a filler in our array */
pr->power.states[ACPI_STATE_C0].valid = 1;
- pr->power.states[ACPI_STATE_C1].valid = 1;
-
return 0;
}
if (nocst)
return -ENODEV;
- current_count = 1;
-
- /* Zero initialize C2 onwards and prepare for fresh CST lookup */
- for (i = 2; i < ACPI_PROCESSOR_MAX_POWER; i++)
- memset(&(pr->power.states[i]), 0,
- sizeof(struct acpi_processor_cx));
+ current_count = 0;
status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer);
if (ACPI_FAILURE(status)) {
(reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE))
continue;
- cx.address = (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) ?
- 0 : reg->address;
-
/* There should be an easy way to extract an integer... */
obj = (union acpi_object *)&(element->package.elements[1]);
if (obj->type != ACPI_TYPE_INTEGER)
continue;
cx.type = obj->integer.value;
-
- if ((cx.type != ACPI_STATE_C1) &&
- (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO))
- continue;
-
- if ((cx.type < ACPI_STATE_C2) || (cx.type > ACPI_STATE_C3))
- continue;
+ /*
+ * Some buggy BIOSes won't list C1 in _CST -
+ * Let acpi_processor_get_power_info_default() handle them later
+ */
+ if (i == 1 && cx.type != ACPI_STATE_C1)
+ current_count++;
+
+ cx.address = reg->address;
+ cx.index = current_count + 1;
+
+ cx.space_id = ACPI_CSTATE_SYSTEMIO;
+ if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {
+ if (acpi_processor_ffh_cstate_probe
+ (pr->id, &cx, reg) == 0) {
+ cx.space_id = ACPI_CSTATE_FFH;
+ } else if (cx.type != ACPI_STATE_C1) {
+ /*
+ * C1 is a special case where FIXED_HARDWARE
+ * can be handled in non-MWAIT way as well.
+ * In that case, save this _CST entry info.
+ * That is, we retain space_id of SYSTEM_IO for
+ * halt based C1.
+ * Otherwise, ignore this info and continue.
+ */
+ continue;
+ }
+ }
obj = (union acpi_object *)&(element->package.elements[2]);
if (obj->type != ACPI_TYPE_INTEGER)
/* NOTE: the idle thread may not be running while calling
* this function */
- /* Adding C1 state */
- acpi_processor_get_power_info_default_c1(pr);
+ /* Zero initialize all the C-states info. */
+ memset(pr->power.states, 0, sizeof(pr->power.states));
+
result = acpi_processor_get_power_info_cst(pr);
if (result == -ENODEV)
acpi_processor_get_power_info_fadt(pr);
+ if (result)
+ return result;
+
+ acpi_processor_get_power_info_default(pr);
+
pr->power.count = acpi_processor_power_verify(pr);
/*
projects / powerpc.git / blobdiff