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clk: gate: Add inverted gate support 

This adds support for gates which need 0 to enable.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2013-04-15 14:06:50 +02:00
parent c7e41dac4f
commit 707fb7ada5
2 changed files with 35 additions and 4 deletions
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37
drivers/clk/clk-gate.c
View File

@ -25,6 +25,8 @@ struct clk_gate {
void __iomem *reg;
int shift;
const char *parent;
#define CLK_GATE_INVERTED (1 << 0)
unsigned flags;
};
static int clk_gate_enable(struct clk *clk)
@ -33,7 +35,12 @@ static int clk_gate_enable(struct clk *clk)
u32 val;
val = readl(g->reg);
val |= 1 << g->shift;
if (g->flags & CLK_GATE_INVERTED)
val &= ~(1 << g->shift);
else
val |= 1 << g->shift;
writel(val, g->reg);
return 0;
@ -45,7 +52,12 @@ static void clk_gate_disable(struct clk *clk)
u32 val;
val = readl(g->reg);
val &= ~(1 << g->shift);
if (g->flags & CLK_GATE_INVERTED)
val |= 1 << g->shift;
else
val &= ~(1 << g->shift);
writel(val, g->reg);
}
@ -57,9 +69,9 @@ static int clk_gate_is_enabled(struct clk *clk)
val = readl(g->reg);
if (val & (1 << g->shift))
return 1;
return g->flags & CLK_GATE_INVERTED ? 0 : 1;
else
return 0;
return g->flags & CLK_GATE_INVERTED ? 1 : 0;
}
struct clk_ops clk_gate_ops = {
@ -90,3 +102,20 @@ struct clk *clk_gate(const char *name, const char *parent, void __iomem *reg,
return &g->clk;
}
struct clk *clk_gate_inverted(const char *name, const char *parent,
void __iomem *reg, u8 shift)
{
struct clk *clk;
struct clk_gate *g;
clk = clk_gate(name, parent, reg, shift);
if (IS_ERR(clk))
return clk;
g = container_of(clk, struct clk_gate, clk);
g->flags = CLK_GATE_INVERTED;
return clk;
}

2
include/linux/clk.h
View File

@ -214,6 +214,8 @@ struct clk *clk_mux(const char *name, void __iomem *reg,
u8 shift, u8 width, const char **parents, u8 num_parents);
struct clk *clk_gate(const char *name, const char *parent, void __iomem *reg,
u8 shift);
struct clk *clk_gate_inverted(const char *name, const char *parent, void __iomem *reg,
u8 shift);
int clk_is_enabled_always(struct clk *clk);