clk: clk-gate: Create clk_gate_endisable()

This patch tries to remove duplicate code for clk_gate clocks. This creates
another routine clk_gate_endisable() which will take care of enable/disable
clock with knowledge of CLK_GATE_SET_TO_DISABLE flag.

It works on following logic:

For enabling clock, enable = 1
	set2dis = 1	-> clear bit	-> set = 0
	set2dis = 0	-> set bit	-> set = 1

For disabling clock, enable = 0
	set2dis = 1	-> set bit	-> set = 1
	set2dis = 0	-> clear bit	-> set = 0

So, result is always: enable xor set2dis.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c
index 42a4b941b6e72e6c9e9362f683e2028eee2798c6..00216164fb9d59d8cc097cb985ff33f2af9d2bc4 100644 (file)
--- a/drivers/clk/clk-gate.c
+++ b/drivers/clk/clk-gate.c
@@ -28,32 +28,38 @@
 
 #define to_clk_gate(_hw) container_of(_hw, struct clk_gate, hw)
 
-static void clk_gate_set_bit(struct clk_gate *gate)
+/*
+ * It works on following logic:
+ *
+ * For enabling clock, enable = 1
+ *     set2dis = 1     -> clear bit    -> set = 0
+ *     set2dis = 0     -> set bit      -> set = 1
+ *
+ * For disabling clock, enable = 0
+ *     set2dis = 1     -> set bit      -> set = 1
+ *     set2dis = 0     -> clear bit    -> set = 0
+ *
+ * So, result is always: enable xor set2dis.
+ */
+static void clk_gate_endisable(struct clk_hw *hw, int enable)
 {
-       u32 reg;
+       struct clk_gate *gate = to_clk_gate(hw);
+       int set = gate->flags & CLK_GATE_SET_TO_DISABLE ? 1 : 0;
        unsigned long flags = 0;
+       u32 reg;
+
+       set ^= enable;
 
        if (gate->lock)
                spin_lock_irqsave(gate->lock, flags);
 
        reg = readl(gate->reg);
-       reg |= BIT(gate->bit_idx);
-       writel(reg, gate->reg);
-
-       if (gate->lock)
-               spin_unlock_irqrestore(gate->lock, flags);
-}
-
-static void clk_gate_clear_bit(struct clk_gate *gate)
-{
-       u32 reg;
-       unsigned long flags = 0;
 
-       if (gate->lock)
-               spin_lock_irqsave(gate->lock, flags);
+       if (set)
+               reg |= BIT(gate->bit_idx);
+       else
+               reg &= ~BIT(gate->bit_idx);
 
-       reg = readl(gate->reg);
-       reg &= ~BIT(gate->bit_idx);
        writel(reg, gate->reg);
 
        if (gate->lock)
@@ -62,24 +68,14 @@ static void clk_gate_clear_bit(struct clk_gate *gate)
 
 static int clk_gate_enable(struct clk_hw *hw)
 {
-       struct clk_gate *gate = to_clk_gate(hw);
-
-       if (gate->flags & CLK_GATE_SET_TO_DISABLE)
-               clk_gate_clear_bit(gate);
-       else
-               clk_gate_set_bit(gate);
+       clk_gate_endisable(hw, 1);
 
        return 0;
 }
 
 static void clk_gate_disable(struct clk_hw *hw)
 {
-       struct clk_gate *gate = to_clk_gate(hw);
-
-       if (gate->flags & CLK_GATE_SET_TO_DISABLE)
-               clk_gate_set_bit(gate);
-       else
-               clk_gate_clear_bit(gate);
+       clk_gate_endisable(hw, 0);
 }
 
 static int clk_gate_is_enabled(struct clk_hw *hw)