ARM: OMAP: clock: list all clk_hw_omap clks to enable/disable autoidle

Platforms can call omap2_init_clk_hw_omap_clocks() to register a clock
using clk_hw_omap. omap2_clk_enable_autoidle_all() and
omap2_clk_disable_autoidle_all() can then be used to run through
all the clocks which support autoidle to enable/disable them.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Mike Turquette <mturquette@ti.com>
[paul@pwsan.com: added kerneldoc on non-trivial new functions]
Signed-off-by: Paul Walmsley <paul@pwsan.com>

arch/arm/mach-omap2/clock.c

@@ -66,6 +66,7 @@ static DEFINE_SPINLOCK(clockfw_lock);
 #endif
 
 #ifdef CONFIG_COMMON_CLK
+static LIST_HEAD(clk_hw_omap_clocks);
 
 /*
  * Used for clocks that have the same value as the parent clock,
@@ -521,6 +522,64 @@ static int __init omap_clk_setup(char *str)
 }
 __setup("mpurate=", omap_clk_setup);
 
+/**
+ * omap2_init_clk_hw_omap_clocks - initialize an OMAP clock
+ * @clk: struct clk * to initialize
+ *
+ * Add an OMAP clock @clk to the internal list of OMAP clocks.  Used
+ * temporarily for autoidle handling, until this support can be
+ * integrated into the common clock framework code in some way.  No
+ * return value.
+ */
+void omap2_init_clk_hw_omap_clocks(struct clk *clk)
+{
+	struct clk_hw_omap *c;
+
+	if (__clk_get_flags(clk) & CLK_IS_BASIC)
+		return;
+
+	c = to_clk_hw_omap(__clk_get_hw(clk));
+	list_add(&c->node, &clk_hw_omap_clocks);
+}
+
+/**
+ * omap2_clk_enable_autoidle_all - enable autoidle on all OMAP clocks that
+ * support it
+ *
+ * Enable clock autoidle on all OMAP clocks that have allow_idle
+ * function pointers associated with them.  This function is intended
+ * to be temporary until support for this is added to the common clock
+ * code.  Returns 0.
+ */
+int omap2_clk_enable_autoidle_all(void)
+{
+	struct clk_hw_omap *c;
+
+	list_for_each_entry(c, &clk_hw_omap_clocks, node)
+		if (c->ops && c->ops->allow_idle)
+			c->ops->allow_idle(c);
+	return 0;
+}
+
+/**
+ * omap2_clk_disable_autoidle_all - disable autoidle on all OMAP clocks that
+ * support it
+ *
+ * Disable clock autoidle on all OMAP clocks that have allow_idle
+ * function pointers associated with them.  This function is intended
+ * to be temporary until support for this is added to the common clock
+ * code.  Returns 0.
+ */
+int omap2_clk_disable_autoidle_all(void)
+{
+	struct clk_hw_omap *c;
+
+	list_for_each_entry(c, &clk_hw_omap_clocks, node)
+		if (c->ops && c->ops->deny_idle)
+			c->ops->deny_idle(c);
+	return 0;
+}
+
 const struct clk_hw_omap_ops clkhwops_wait = {
 	.find_idlest	= omap2_clk_dflt_find_idlest,
 	.find_companion	= omap2_clk_dflt_find_companion,

arch/arm/mach-omap2/clock.h

@@ -535,6 +535,9 @@ void omap2_clk_dflt_find_companion(struct clk_hw_omap *clk,
 void omap2_clk_dflt_find_idlest(struct clk_hw_omap *clk,
 				void __iomem **idlest_reg,
 				u8 *idlest_bit, u8 *idlest_val);
+void omap2_init_clk_hw_omap_clocks(struct clk *clk);
+int omap2_clk_enable_autoidle_all(void);
+int omap2_clk_disable_autoidle_all(void);
 #else
 int omap2_dflt_clk_enable(struct clk *clk);
 void omap2_dflt_clk_disable(struct clk *clk);

arch/arm/mach-omap2/io.c

@@ -407,6 +407,9 @@ void __init omap2420_init_late(void)
 	omap_mux_late_init();
 	omap2_common_pm_late_init();
 	omap2_pm_init();
+#ifdef CONFIG_COMMON_CLK
+	omap2_clk_enable_autoidle_all();
+#endif
 }
 #endif
 
@@ -436,6 +439,9 @@ void __init omap2430_init_late(void)
 	omap_mux_late_init();
 	omap2_common_pm_late_init();
 	omap2_pm_init();
+#ifdef CONFIG_COMMON_CLK
+	omap2_clk_enable_autoidle_all();
+#endif
 }
 #endif
 
@@ -509,6 +515,9 @@ void __init omap3_init_late(void)
 	omap_mux_late_init();
 	omap2_common_pm_late_init();
 	omap3_pm_init();
+#ifdef CONFIG_COMMON_CLK
+	omap2_clk_enable_autoidle_all();
+#endif
 }
 
 void __init omap3430_init_late(void)
@@ -516,6 +525,9 @@ void __init omap3430_init_late(void)
 	omap_mux_late_init();
 	omap2_common_pm_late_init();
 	omap3_pm_init();
+#ifdef CONFIG_COMMON_CLK
+	omap2_clk_enable_autoidle_all();
+#endif
 }
 
 void __init omap35xx_init_late(void)
@@ -523,6 +535,9 @@ void __init omap35xx_init_late(void)
 	omap_mux_late_init();
 	omap2_common_pm_late_init();
 	omap3_pm_init();
+#ifdef CONFIG_COMMON_CLK
+	omap2_clk_enable_autoidle_all();
+#endif
 }
 
 void __init omap3630_init_late(void)
@@ -530,6 +545,9 @@ void __init omap3630_init_late(void)
 	omap_mux_late_init();
 	omap2_common_pm_late_init();
 	omap3_pm_init();
+#ifdef CONFIG_COMMON_CLK
+	omap2_clk_enable_autoidle_all();
+#endif
 }
 
 void __init am35xx_init_late(void)
@@ -537,6 +555,9 @@ void __init am35xx_init_late(void)
 	omap_mux_late_init();
 	omap2_common_pm_late_init();
 	omap3_pm_init();
+#ifdef CONFIG_COMMON_CLK
+	omap2_clk_enable_autoidle_all();
+#endif
 }
 
 void __init ti81xx_init_late(void)
@@ -544,6 +565,9 @@ void __init ti81xx_init_late(void)
 	omap_mux_late_init();
 	omap2_common_pm_late_init();
 	omap3_pm_init();
+#ifdef CONFIG_COMMON_CLK
+	omap2_clk_enable_autoidle_all();
+#endif
 }
 #endif
 
@@ -597,6 +621,9 @@ void __init omap4430_init_late(void)
 	omap_mux_late_init();
 	omap2_common_pm_late_init();
 	omap4_pm_init();
+#ifdef CONFIG_COMMON_CLK
+	omap2_clk_enable_autoidle_all();
+#endif
 }
 #endif