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authorKevin Hilman <khilman@deeprootsystems.com>2010-12-21 21:31:55 -0700
committerPaul Walmsley <paul@pwsan.com>2010-12-21 21:31:55 -0700
commit6081dc348f122cdb76093b2fc6cf5742c968cb69 (patch)
tree8036b8bbc876515462cee608d400293bc490a6ec /arch/arm/plat-omap/omap-pm-noop.c
parentc80705aa7074045e7431ed2ebeb0f7d5773615ab (diff)
OMAP: PM noop: implement context loss count for non-omap_devices
For devices which have not (yet) been converted to use omap_device, implement the context loss counter using the "brutal method" as originally proposed by Paul Walmsley[1]. The dummy context loss counter is incremented every time it is checked, but only when off-mode is enabled. When off-mode is disabled, the dummy counter stops incrementing. Tested on 36xx/Zoom3 using MMC driver, which is currently the only in-tree user of this API. This patch should be reverted after all devices are converted to using omap_device. [1] http://marc.info/?l=linux-omap&m=129176260000626&w=2 Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com> [paul@pwsan.com: fixed compile warning; fixed to compile on OMAP1] Signed-off-by: Paul Walmsley <paul@pwsan.com>
Diffstat (limited to 'arch/arm/plat-omap/omap-pm-noop.c')
-rw-r--r--arch/arm/plat-omap/omap-pm-noop.c46
1 files changed, 45 insertions, 1 deletions
diff --git a/arch/arm/plat-omap/omap-pm-noop.c b/arch/arm/plat-omap/omap-pm-noop.c
index af58daddcf5..b0471bb2d47 100644
--- a/arch/arm/plat-omap/omap-pm-noop.c
+++ b/arch/arm/plat-omap/omap-pm-noop.c
@@ -26,6 +26,9 @@
#include <plat/omap-pm.h>
#include <plat/omap_device.h>
+static bool off_mode_enabled;
+static u32 dummy_context_loss_counter;
+
/*
* Device-driver-originated constraints (via board-*.c files)
*/
@@ -280,10 +283,34 @@ unsigned long omap_pm_cpu_get_freq(void)
return 0;
}
+/**
+ * omap_pm_enable_off_mode - notify OMAP PM that off-mode is enabled
+ *
+ * Intended for use only by OMAP PM core code to notify this layer
+ * that off mode has been enabled.
+ */
+void omap_pm_enable_off_mode(void)
+{
+ off_mode_enabled = true;
+}
+
+/**
+ * omap_pm_disable_off_mode - notify OMAP PM that off-mode is disabled
+ *
+ * Intended for use only by OMAP PM core code to notify this layer
+ * that off mode has been disabled.
+ */
+void omap_pm_disable_off_mode(void)
+{
+ off_mode_enabled = false;
+}
+
/*
* Device context loss tracking
*/
+#ifdef CONFIG_ARCH_OMAP2PLUS
+
u32 omap_pm_get_dev_context_loss_count(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
@@ -292,13 +319,30 @@ u32 omap_pm_get_dev_context_loss_count(struct device *dev)
if (WARN_ON(!dev))
return 0;
- count = omap_device_get_context_loss_count(pdev);
+ if (dev->parent == &omap_device_parent) {
+ count = omap_device_get_context_loss_count(pdev);
+ } else {
+ WARN_ONCE(off_mode_enabled, "omap_pm: using dummy context loss counter; device %s should be converted to omap_device",
+ dev_name(dev));
+ if (off_mode_enabled)
+ dummy_context_loss_counter++;
+ count = dummy_context_loss_counter;
+ }
+
pr_debug("OMAP PM: context loss count for dev %s = %d\n",
dev_name(dev), count);
return count;
}
+#else
+
+u32 omap_pm_get_dev_context_loss_count(struct device *dev)
+{
+ return dummy_context_loss_counter;
+}
+
+#endif
/* Should be called before clk framework init */
int __init omap_pm_if_early_init(void)