From: Rajendra Nayak <rnayak@xxxxxx>
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@xxxxxx>
[paul@xxxxxxxxx: 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]
Signed-off-by: Paul Walmsley <paul@xxxxxxxxx>
Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
---
arch/arm/mach-omap2/omap_hwmod.c | 44 +++++++++++++++++++++++--
arch/arm/plat-omap/include/plat/omap_hwmod.h | 8 +++-
2 files changed, 46 insertions(+), 6 deletions(-)
diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index 00e8cbf..fb2f4a3 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -1489,6 +1489,36 @@ static int _reset(struct omap_hwmod *oh)
}
/**
+ * _omap4_update_context_lost - increment hwmod context loss counter if
+ * hwmod context was lost, and clear hardware context loss reg
+ * @oh: hwmod to check for context loss
+ *
+ * If the PRCM indicates that the hwmod @oh lost context, increment
+ * our in-memory context loss counter, and clear the RM_*_CONTEXT
+ * bits. No return value.
+ */
+static void _omap4_update_context_lost(struct omap_hwmod *oh)
+{
+ u32 r;
+
+ if (!(oh->flags & HWMOD_CONTEXT_REG))
+ return;
+
+ r = omap4_prminst_read_inst_reg(oh->clkdm->pwrdm.ptr->prcm_partition,
+ oh->clkdm->pwrdm.ptr->prcm_offs,
+ oh->prcm.omap4.context_offs);
+
+ if (!r)
+ return;
+
+ oh->prcm.omap4.context_lost_counter++;
+
+ omap4_prminst_write_inst_reg(r, oh->clkdm->pwrdm.ptr->prcm_partition,
+ oh->clkdm->pwrdm.ptr->prcm_offs,
+ oh->prcm.omap4.context_offs);
+}
+
+/**
* _enable - enable an omap_hwmod
* @oh: struct omap_hwmod *
*
@@ -1568,6 +1598,8 @@ static int _enable(struct omap_hwmod *oh)
_enable_clocks(oh);
_enable_module(oh);
+ _omap4_update_context_lost(oh);
+
r = _wait_target_ready(oh);
if (!r) {
/*
@@ -2683,17 +2715,21 @@ ohsps_unlock:
* omap_hwmod_get_context_loss_count - get lost context count
* @oh: struct omap_hwmod *
*
- * Query the powerdomain of of @oh to get the context loss
- * count for this device.
+ * Returns the context loss count of associated @oh
+ * upon success, or zero if no context loss data is available.
*
- * Returns the context loss count of the powerdomain assocated with @oh
- * upon success, or zero if no powerdomain exists for @oh.
+ * On OMAP4, this queries the per-hwmod context loss register,
+ * assuming one exists. If not, or on OMAP2/3, this queries the
+ * enclosing powerdomain context loss count.
*/
int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
{
struct powerdomain *pwrdm;
int ret = 0;
+ if (oh->flags & HWMOD_CONTEXT_REG)
+ return oh->prcm.omap4.context_lost_counter;
+
pwrdm = omap_hwmod_get_pwrdm(oh);
if (pwrdm)
ret = pwrdm_get_context_loss_count(pwrdm);
diff --git a/arch/arm/plat-omap/include/plat/omap_hwmod.h b/arch/arm/plat-omap/include/plat/omap_hwmod.h
index 4e5513b..7a00215 100644
--- a/arch/arm/plat-omap/include/plat/omap_hwmod.h
+++ b/arch/arm/plat-omap/include/plat/omap_hwmod.h
@@ -362,9 +362,12 @@ struct omap_hwmod_omap2_prcm {
/**
* struct omap_hwmod_omap4_prcm - OMAP4-specific PRCM data
- * @clkctrl_reg: PRCM address of the clock control register
- * @rstctrl_reg: address of the XXX_RSTCTRL register located in the PRM
+ * @clkctrl_offs: offset of the PRCM clock control register
+ * @rstctrl_offs: offset of the XXX_RSTCTRL register located in the PRM
+ * @context_offs: offset of the RM_*_CONTEXT register
* @submodule_wkdep_bit: bit shift of the WKDEP range
+ * @modulemode: allowable modulemodes
+ * @context_lost_counter: Count of module level context lost
*/
struct omap_hwmod_omap4_prcm {
u16 clkctrl_offs;
@@ -372,6 +375,7 @@ struct omap_hwmod_omap4_prcm {
u16 context_offs;
u8 submodule_wkdep_bit;
u8 modulemode;
+ unsigned context_lost_counter;
};
--
1.7.4.1
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