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authorScott Wood <scottwood@freescale.com>2011-06-22 18:10:30 -0500
committerKumar Gala <galak@kernel.crashing.org>2011-06-27 08:36:15 -0500
commitebf714ff37561331eb39963945d80bfc2a59e00f (patch)
tree4332a9b8ba4472a439db4d21ece64066d88358d1
parentf340fe69f5e87c9f630b077cf52142ec15964a41 (diff)
downloadop-kernel-dev-ebf714ff37561331eb39963945d80bfc2a59e00f.zip
op-kernel-dev-ebf714ff37561331eb39963945d80bfc2a59e00f.tar.gz
powerpc/e500mc: Add support for the wait instruction in e500_idle
e500mc cannot doze or nap due to an erratum (as well as having a different mechanism than previous e500), but it has a "wait" instruction that is similar to doze. On 64-bit, due to the soft-irq-disable mechanism, the existing book3e_idle should be used instead. Signed-off-by: Vakul Garg <vakul@freescale.com> Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
-rw-r--r--arch/powerpc/kernel/idle_e500.S12
-rw-r--r--arch/powerpc/platforms/85xx/p3041_ds.c1
-rw-r--r--arch/powerpc/platforms/85xx/p4080_ds.c1
-rw-r--r--arch/powerpc/platforms/85xx/p5020_ds.c5
4 files changed, 19 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/idle_e500.S b/arch/powerpc/kernel/idle_e500.S
index 47a1a98..3e2b95c 100644
--- a/arch/powerpc/kernel/idle_e500.S
+++ b/arch/powerpc/kernel/idle_e500.S
@@ -26,6 +26,17 @@ _GLOBAL(e500_idle)
ori r4,r4,_TLF_NAPPING /* so when we take an exception */
stw r4,TI_LOCAL_FLAGS(r3) /* it will return to our caller */
+#ifdef CONFIG_E500MC
+ wrteei 1
+1: wait
+
+ /*
+ * Guard against spurious wakeups (e.g. from a hypervisor) --
+ * any real interrupt will cause us to return to LR due to
+ * _TLF_NAPPING.
+ */
+ b 1b
+#else
/* Check if we can nap or doze, put HID0 mask in r3 */
lis r3,0
BEGIN_FTR_SECTION
@@ -72,6 +83,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_L2CSR|CPU_FTR_CAN_NAP)
mtmsr r7
isync
2: b 2b
+#endif /* !E500MC */
/*
* Return from NAP/DOZE mode, restore some CPU specific registers,
diff --git a/arch/powerpc/platforms/85xx/p3041_ds.c b/arch/powerpc/platforms/85xx/p3041_ds.c
index e2cfb6b..1fcd233 100644
--- a/arch/powerpc/platforms/85xx/p3041_ds.c
+++ b/arch/powerpc/platforms/85xx/p3041_ds.c
@@ -69,6 +69,7 @@ define_machine(p3041_ds) {
.restart = fsl_rstcr_restart,
.calibrate_decr = generic_calibrate_decr,
.progress = udbg_progress,
+ .power_save = e500_idle,
};
machine_device_initcall(p3041_ds, corenet_ds_publish_devices);
diff --git a/arch/powerpc/platforms/85xx/p4080_ds.c b/arch/powerpc/platforms/85xx/p4080_ds.c
index eed4b01..430c8f9 100644
--- a/arch/powerpc/platforms/85xx/p4080_ds.c
+++ b/arch/powerpc/platforms/85xx/p4080_ds.c
@@ -68,6 +68,7 @@ define_machine(p4080_ds) {
.restart = fsl_rstcr_restart,
.calibrate_decr = generic_calibrate_decr,
.progress = udbg_progress,
+ .power_save = e500_idle,
};
machine_device_initcall(p4080_ds, corenet_ds_publish_devices);
diff --git a/arch/powerpc/platforms/85xx/p5020_ds.c b/arch/powerpc/platforms/85xx/p5020_ds.c
index 94348c9b..f7220d4 100644
--- a/arch/powerpc/platforms/85xx/p5020_ds.c
+++ b/arch/powerpc/platforms/85xx/p5020_ds.c
@@ -74,6 +74,11 @@ define_machine(p5020_ds) {
.restart = fsl_rstcr_restart,
.calibrate_decr = generic_calibrate_decr,
.progress = udbg_progress,
+#ifdef CONFIG_PPC64
+ .power_save = book3e_idle,
+#else
+ .power_save = e500_idle,
+#endif
};
machine_device_initcall(p5020_ds, corenet_ds_publish_devices);
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