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authorJoseph Lo <josephl@nvidia.com>2013-01-15 22:11:01 +0000
committerStephen Warren <swarren@nvidia.com>2013-01-28 11:20:38 -0700
commitafec581c4b53e03a97d9ef1b7a746a67967573cf (patch)
tree148b93a680ee69542ac3cb8dfc7ff77a64cea6ea /arch/arm/mach-tegra
parent4a2e32794e71db679b91df1d9c98921b2e32ec4e (diff)
ARM: tegra20: flowctrl: add support for cpu_suspend_enter/exit
The flow controller can help CPU to go into suspend mode (powered-down state). When CPU go into powered-down state, it needs some careful settings before getting into and after leaving. The enter and exit functions do that by configuring appropriate mode for flow controller. Signed-off-by: Joseph Lo <josephl@nvidia.com> Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'arch/arm/mach-tegra')
-rw-r--r--arch/arm/mach-tegra/flowctrl.c38
-rw-r--r--arch/arm/mach-tegra/flowctrl.h4
2 files changed, 37 insertions, 5 deletions
diff --git a/arch/arm/mach-tegra/flowctrl.c b/arch/arm/mach-tegra/flowctrl.c
index 5393eb2cae2..b477ef310dc 100644
--- a/arch/arm/mach-tegra/flowctrl.c
+++ b/arch/arm/mach-tegra/flowctrl.c
@@ -25,6 +25,7 @@
#include "flowctrl.h"
#include "iomap.h"
+#include "fuse.h"
static u8 flowctrl_offset_halt_cpu[] = {
FLOW_CTRL_HALT_CPU0_EVENTS,
@@ -75,11 +76,26 @@ void flowctrl_cpu_suspend_enter(unsigned int cpuid)
int i;
reg = flowctrl_read_cpu_csr(cpuid);
- reg &= ~TEGRA30_FLOW_CTRL_CSR_WFE_BITMAP; /* clear wfe bitmap */
- reg &= ~TEGRA30_FLOW_CTRL_CSR_WFI_BITMAP; /* clear wfi bitmap */
+ switch (tegra_chip_id) {
+ case TEGRA20:
+ /* clear wfe bitmap */
+ reg &= ~TEGRA20_FLOW_CTRL_CSR_WFE_BITMAP;
+ /* clear wfi bitmap */
+ reg &= ~TEGRA20_FLOW_CTRL_CSR_WFI_BITMAP;
+ /* pwr gating on wfe */
+ reg |= TEGRA20_FLOW_CTRL_CSR_WFE_CPU0 << cpuid;
+ break;
+ case TEGRA30:
+ /* clear wfe bitmap */
+ reg &= ~TEGRA30_FLOW_CTRL_CSR_WFE_BITMAP;
+ /* clear wfi bitmap */
+ reg &= ~TEGRA30_FLOW_CTRL_CSR_WFI_BITMAP;
+ /* pwr gating on wfi */
+ reg |= TEGRA30_FLOW_CTRL_CSR_WFI_CPU0 << cpuid;
+ break;
+ }
reg |= FLOW_CTRL_CSR_INTR_FLAG; /* clear intr flag */
reg |= FLOW_CTRL_CSR_EVENT_FLAG; /* clear event flag */
- reg |= TEGRA30_FLOW_CTRL_CSR_WFI_CPU0 << cpuid; /* pwr gating on wfi */
reg |= FLOW_CTRL_CSR_ENABLE; /* pwr gating */
flowctrl_write_cpu_csr(cpuid, reg);
@@ -99,8 +115,20 @@ void flowctrl_cpu_suspend_exit(unsigned int cpuid)
/* Disable powergating via flow controller for CPU0 */
reg = flowctrl_read_cpu_csr(cpuid);
- reg &= ~TEGRA30_FLOW_CTRL_CSR_WFE_BITMAP; /* clear wfe bitmap */
- reg &= ~TEGRA30_FLOW_CTRL_CSR_WFI_BITMAP; /* clear wfi bitmap */
+ switch (tegra_chip_id) {
+ case TEGRA20:
+ /* clear wfe bitmap */
+ reg &= ~TEGRA20_FLOW_CTRL_CSR_WFE_BITMAP;
+ /* clear wfi bitmap */
+ reg &= ~TEGRA20_FLOW_CTRL_CSR_WFI_BITMAP;
+ break;
+ case TEGRA30:
+ /* clear wfe bitmap */
+ reg &= ~TEGRA30_FLOW_CTRL_CSR_WFE_BITMAP;
+ /* clear wfi bitmap */
+ reg &= ~TEGRA30_FLOW_CTRL_CSR_WFI_BITMAP;
+ break;
+ }
reg &= ~FLOW_CTRL_CSR_ENABLE; /* clear enable */
reg |= FLOW_CTRL_CSR_INTR_FLAG; /* clear intr */
reg |= FLOW_CTRL_CSR_EVENT_FLAG; /* clear event */
diff --git a/arch/arm/mach-tegra/flowctrl.h b/arch/arm/mach-tegra/flowctrl.h
index 0798dec1832..67eab56699b 100644
--- a/arch/arm/mach-tegra/flowctrl.h
+++ b/arch/arm/mach-tegra/flowctrl.h
@@ -34,6 +34,10 @@
#define FLOW_CTRL_HALT_CPU1_EVENTS 0x14
#define FLOW_CTRL_CPU1_CSR 0x18
+#define TEGRA20_FLOW_CTRL_CSR_WFE_CPU0 (1 << 4)
+#define TEGRA20_FLOW_CTRL_CSR_WFE_BITMAP (3 << 4)
+#define TEGRA20_FLOW_CTRL_CSR_WFI_BITMAP 0
+
#define TEGRA30_FLOW_CTRL_CSR_WFI_CPU0 (1 << 8)
#define TEGRA30_FLOW_CTRL_CSR_WFE_BITMAP (0xF << 4)
#define TEGRA30_FLOW_CTRL_CSR_WFI_BITMAP (0xF << 8)