OMAP2/3 clock: Extend find_idlest() to pass back idle state value

Current implementation defines clock idle state indicators based on the
cpu information (cpu_is_omap24xx() or cpu_is_omap34xx()) in a system wide
manner. This patch extends the find_idlest() function in clkops to pass
back the idle state indicator for that clock, thus allowing idle state
indicators to be defined on a per clock basis if required.

This is specifically needed on AM35xx devices as the new IPSS clocks
indicates the idle status (0 is idle, 1 is ready) in a way just
opposite to how its handled in OMAP3 (0 is ready, 1 is idle).

Signed-off-by: Ranjith Lohithakshan <ranjithl@ti.com>
[paul@pwsan.com: updated to apply after commit 98c45457 et seq.]
Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 20 insertions, 5 deletions

diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c
index 999b91e023b..3bb3292ec46 100644
--- a/arch/arm/mach-omap2/clock.c
+++ b/arch/arm/mach-omap2/clock.c
@@ -57,7 +57,7 @@ u8 cpu_mask;
 static void _omap2_module_wait_ready(struct clk *clk)
 {
         void __iomem *companion_reg, *idlest_reg;
-        u8 other_bit, idlest_bit;
+        u8 other_bit, idlest_bit, idlest_val;
 
         /* Not all modules have multiple clocks that their IDLEST depends on */
         if (clk->ops->find_companion) {
@@ -66,9 +66,10 @@ static void _omap2_module_wait_ready(struct clk *clk)
                         return;
         }
 
-        clk->ops->find_idlest(clk, &idlest_reg, &idlest_bit);
+        clk->ops->find_idlest(clk, &idlest_reg, &idlest_bit, &idlest_val);
 
-        omap2_cm_wait_idlest(idlest_reg, (1 << idlest_bit), clk->name);
+        omap2_cm_wait_idlest(idlest_reg, (1 << idlest_bit), idlest_val,
+                             clk->name);
 }
 
 /* Enables clock without considering parent dependencies or use count
@@ -175,7 +176,8 @@ void omap2_clk_dflt_find_companion(struct clk *clk, void __iomem **other_reg,
  * omap2_clk_dflt_find_idlest - find CM_IDLEST reg va, bit shift for @clk
  * @clk: struct clk * to find IDLEST info for
  * @idlest_reg: void __iomem ** to return the CM_IDLEST va in
- * @idlest_bit: u8 ** to return the CM_IDLEST bit shift in
+ * @idlest_bit: u8 * to return the CM_IDLEST bit shift in
+ * @idlest_val: u8 * to return the idle status indicator
  *
  * Return the CM_IDLEST register address and bit shift corresponding
  * to the module that "owns" this clock.  This default code assumes
@@ -185,13 +187,26 @@ void omap2_clk_dflt_find_companion(struct clk *clk, void __iomem **other_reg,
  * CM_IDLEST2).  This is not true for all modules.  No return value.
  */
 void omap2_clk_dflt_find_idlest(struct clk *clk, void __iomem **idlest_reg,
-                                u8 *idlest_bit)
+                                u8 *idlest_bit, u8 *idlest_val)
 {
         u32 r;
 
         r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
         *idlest_reg = (__force void __iomem *)r;
         *idlest_bit = clk->enable_bit;
+
+        /*
+         * 24xx uses 0 to indicate not ready, and 1 to indicate ready.
+         * 34xx reverses this, just to keep us on our toes
+         * AM35xx uses both, depending on the module.
+         */
+        if (cpu_is_omap24xx())
+                *idlest_val = OMAP24XX_CM_IDLEST_VAL;
+        else if (cpu_is_omap34xx())
+                *idlest_val = OMAP34XX_CM_IDLEST_VAL;
+        else
+                BUG();
+
 }
 
 int omap2_dflt_clk_enable(struct clk *clk)