ARM: OMAP2+: hwmod: Add support for per hwmod/module context lost count

OMAP4 has module specific context lost registers which makes it now
possible to have module level context loss count, instead of relying
on the powerdomain level context count.

Add 2 private hwmod api's to update/clear the hwmod/module specific
context lost counters/register.

Update the module specific context_lost_counter and clear the hardware
bits just after enabling the module.

omap_hwmod_get_context_loss_count() now returns the hwmod context loss
count them on platforms where they exist (OMAP4), else fall back on
the pwrdm level counters for older platforms.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
[paul@pwsan.com: added function kerneldoc, fixed structure kerneldoc,
 rearranged structure to avoid memory waste, marked fns as OMAP4-specific,
 prevent fn entry on non-OMAP4 chips, reduced indentation, merged update
 and clear, merged patches]
[t-kristo@ti.com: added support for arch specific hwmod ops, and changed
 the no context offset indicator to USHRT_MAX]
Signed-off-by: Tero Kristo <t-kristo@ti.com>
[paul@pwsan.com: use NO_CONTEXT_LOSS_BIT flag rather than USHRT_MAX;
 convert unsigned context lost counter to int to match the return type;
 get rid of hwmod_ops in favor of the existing soc_ops mechanism;
 move context loss low-level accesses to the PRM code]
Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/arch/arm/mach-omap2/prm.h b/arch/arm/mach-omap2/prm.h
index a1a266ce90da..ac25ae6667cf 100644
--- a/arch/arm/mach-omap2/prm.h
+++ b/arch/arm/mach-omap2/prm.h
@@ -114,16 +114,25 @@ struct prm_reset_src_map {
 
 /**
  * struct prm_ll_data - fn ptrs to per-SoC PRM function implementations
- * @read_reset_sources: ptr to the Soc PRM-specific get_reset_source impl
+ * @read_reset_sources: ptr to the SoC PRM-specific get_reset_source impl
+ * @was_any_context_lost_old: ptr to the SoC PRM context loss test fn
+ * @clear_context_loss_flags_old: ptr to the SoC PRM context loss flag clear fn
+ *
+ * XXX @was_any_context_lost_old and @clear_context_loss_flags_old are
+ * deprecated.
  */
 struct prm_ll_data {
 	u32 (*read_reset_sources)(void);
+	bool (*was_any_context_lost_old)(u8 part, s16 inst, u16 idx);
+	void (*clear_context_loss_flags_old)(u8 part, s16 inst, u16 idx);
 };
 
 extern int prm_register(struct prm_ll_data *pld);
 extern int prm_unregister(struct prm_ll_data *pld);
 
 extern u32 prm_read_reset_sources(void);
+extern bool prm_was_any_context_lost_old(u8 part, s16 inst, u16 idx);
+extern void prm_clear_context_loss_flags_old(u8 part, s16 inst, u16 idx);
 
 #endif