From: Rajendra Nayak <rnayak@xxxxxx>
On OMAP various clock nodes (dpll's, mx post dividers, interface clocks)
support hardware level autogating which can be controlled from
software.
Support such functionality by adding two new function pointer
allow_idle and deny_idle in the clkops structure.
These function pointers can be populated for any clock
node which supports hardware level autogating.
Also add 2 new functions (omap_clk_enable_auotidle and
omap_clk_disable_autoidle) which can be called from
architecture specific PM core code, if hardware level
autogating (for all supported clock nodes) is to be
enabled or disabled.
Signed-off-by: Rajendra Nayak <rnayak@xxxxxx>
---
arch/arm/plat-omap/clock.c | 26 ++++++++++++++++++++++++++
arch/arm/plat-omap/include/plat/clock.h | 6 ++++++
2 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
index fc62fb5..6889c5a 100644
--- a/arch/arm/plat-omap/clock.c
+++ b/arch/arm/plat-omap/clock.c
@@ -335,6 +335,32 @@ struct clk *omap_clk_get_by_name(const char *name)
return ret;
}
+void omap_clk_enable_autoidle(void)
+{
+ struct clk *c;
+
+ mutex_lock(&clocks_mutex);
+
+ list_for_each_entry(c, &clocks, node)
+ if (c->ops->allow_idle)
+ c->ops->allow_idle(c);
+
+ mutex_unlock(&clocks_mutex);
+}
+
+void omap_clk_disable_autoidle(void)
+{
+ struct clk *c;
+
+ mutex_lock(&clocks_mutex);
+
+ list_for_each_entry(c, &clocks, node)
+ if (c->ops->deny_idle)
+ c->ops->deny_idle(c);
+
+ mutex_unlock(&clocks_mutex);
+}
+
/*
* Low level helpers
*/
diff --git a/arch/arm/plat-omap/include/plat/clock.h b/arch/arm/plat-omap/include/plat/clock.h
index 8eb0ada..167f1e0 100644
--- a/arch/arm/plat-omap/include/plat/clock.h
+++ b/arch/arm/plat-omap/include/plat/clock.h
@@ -25,6 +25,8 @@ struct clockdomain;
* @disable: fn ptr that enables the current clock in hardware
* @find_idlest: function returning the IDLEST register for the clock's IP blk
* @find_companion: function returning the "companion" clk reg for the clock
+ * @allow_idle: fn ptr that enables autoidle for the current clock in hardware
+ * @deny_idle: fn ptr that disables autoidle for the current clock in hardware
*
* A "companion" clk is an accompanying clock to the one being queried
* that must be enabled for the IP module connected to the clock to
@@ -42,6 +44,8 @@ struct clkops {
u8 *, u8 *);
void (*find_companion)(struct clk *, void __iomem **,
u8 *);
+ void (*allow_idle)(struct clk *);
+ void (*deny_idle)(struct clk *);
};
#ifdef CONFIG_ARCH_OMAP2PLUS
@@ -292,6 +296,8 @@ extern void clk_init_cpufreq_table(struct cpufreq_frequency_table **table);
extern void clk_exit_cpufreq_table(struct cpufreq_frequency_table **table);
#endif
extern struct clk *omap_clk_get_by_name(const char *name);
+extern void omap_clk_enable_autoidle(void);
+extern void omap_clk_disable_autoidle(void);
extern const struct clkops clkops_null;
--
1.6.0.4
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