ARM: OMAP2+: Add functions to save and restore clockdomain context en-masse.

[linux-2.6-microblaze.git] / arch / arm / mach-omap2 / cm33xx.c

diff --git a/arch/arm/mach-omap2/cm33xx.c b/arch/arm/mach-omap2/cm33xx.c
index 1cc0247..084d454 100644 (file)
--- a/arch/arm/mach-omap2/cm33xx.c
+++ b/arch/arm/mach-omap2/cm33xx.c
@@ -72,6 +72,17 @@ static inline u32 am33xx_cm_rmw_reg_bits(u32 mask, u32 bits, s16 inst, s16 idx)
        return v;
 }
 
+static inline u32 am33xx_cm_read_reg_bits(u16 inst, s16 idx, u32 mask)
+{
+       u32 v;
+
+       v = am33xx_cm_read_reg(inst, idx);
+       v &= mask;
+       v >>= __ffs(mask);
+
+       return v;
+}
+
 /**
  * _clkctrl_idlest - read a CM_*_CLKCTRL register; mask & shift IDLEST bitfield
  * @inst: CM instance register offset (*_INST macro)
@@ -338,6 +349,46 @@ static u32 am33xx_cm_xlate_clkctrl(u8 part, u16 inst, u16 offset)
        return cm_base.pa + inst + offset;
 }
 
+/**
+ * am33xx_clkdm_save_context - Save the clockdomain transition context
+ * @clkdm: The clockdomain pointer whose context needs to be saved
+ *
+ * Save the clockdomain transition context.
+ */
+static int am33xx_clkdm_save_context(struct clockdomain *clkdm)
+{
+       clkdm->context = am33xx_cm_read_reg_bits(clkdm->cm_inst,
+                                                clkdm->clkdm_offs,
+                                                AM33XX_CLKTRCTRL_MASK);
+
+       return 0;
+}
+
+/**
+ * am33xx_restore_save_context - Restore the clockdomain transition context
+ * @clkdm: The clockdomain pointer whose context needs to be restored
+ *
+ * Restore the clockdomain transition context.
+ */
+static int am33xx_clkdm_restore_context(struct clockdomain *clkdm)
+{
+       switch (clkdm->context) {
+       case OMAP34XX_CLKSTCTRL_DISABLE_AUTO:
+               am33xx_clkdm_deny_idle(clkdm);
+               break;
+       case OMAP34XX_CLKSTCTRL_FORCE_SLEEP:
+               am33xx_clkdm_sleep(clkdm);
+               break;
+       case OMAP34XX_CLKSTCTRL_FORCE_WAKEUP:
+               am33xx_clkdm_wakeup(clkdm);
+               break;
+       case OMAP34XX_CLKSTCTRL_ENABLE_AUTO:
+               am33xx_clkdm_allow_idle(clkdm);
+               break;
+       }
+       return 0;
+}
+
 struct clkdm_ops am33xx_clkdm_operations = {
        .clkdm_sleep            = am33xx_clkdm_sleep,
        .clkdm_wakeup           = am33xx_clkdm_wakeup,
@@ -345,6 +396,8 @@ struct clkdm_ops am33xx_clkdm_operations = {
        .clkdm_deny_idle        = am33xx_clkdm_deny_idle,
        .clkdm_clk_enable       = am33xx_clkdm_clk_enable,
        .clkdm_clk_disable      = am33xx_clkdm_clk_disable,
+       .clkdm_save_context     = am33xx_clkdm_save_context,
+       .clkdm_restore_context  = am33xx_clkdm_restore_context,
 };
 
 static const struct cm_ll_data am33xx_cm_ll_data = {