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clk: clk-gate: Create clk_gate_endisable()

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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>
This commit is contained in:
Viresh Kumar 2012-04-17 16:45:37 +05:30 committed by Mike Turquette
parent 1f73f31ad6
commit fbc42aab54
1 changed files with 25 additions and 29 deletions
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54
drivers/clk/clk-gate.c
View File

@ -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);
}
if (set)
reg |= BIT(gate->bit_idx);
else
reg &= ~BIT(gate->bit_idx);
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);
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)