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sh: clkfwk: Support variable size accesses for MSTP clocks.

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The bulk of the MSTP users require 32-bit access, but this isn't the case
for some of the SH-2A parts, so add in some basic infrastructure to let
the CPU define its required access size in preparation.

Requested-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2012-04-11 12:05:50 +09:00
parent a9e1e53bcf
commit 4d6ddb08ac
2 changed files with 58 additions and 14 deletions
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34
include/linux/sh_clk.h
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@ -59,7 +59,15 @@ struct clk {
unsigned int nr_freqs;
};
#define CLK_ENABLE_ON_INIT (1 << 0)
#define CLK_ENABLE_ON_INIT BIT(0)
#define CLK_ENABLE_REG_32BIT BIT(1) /* default access size */
#define CLK_ENABLE_REG_16BIT BIT(2)
#define CLK_ENABLE_REG_8BIT BIT(3)
#define CLK_ENABLE_REG_MASK (CLK_ENABLE_REG_32BIT | \
CLK_ENABLE_REG_16BIT | \
CLK_ENABLE_REG_8BIT)
/* drivers/sh/clk.c */
unsigned long followparent_recalc(struct clk *);
@ -102,7 +110,7 @@ long clk_round_parent(struct clk *clk, unsigned long target,
unsigned long *best_freq, unsigned long *parent_freq,
unsigned int div_min, unsigned int div_max);
#define SH_CLK_MSTP32(_parent, _enable_reg, _enable_bit, _flags) \
#define SH_CLK_MSTP(_parent, _enable_reg, _enable_bit, _flags) \
{ \
.parent = _parent, \
.enable_reg = (void __iomem *)_enable_reg, \
@ -110,7 +118,27 @@ long clk_round_parent(struct clk *clk, unsigned long target,
.flags = _flags, \
}
int sh_clk_mstp32_register(struct clk *clks, int nr);
#define SH_CLK_MSTP32(_p, _r, _b, _f) \
SH_CLK_MSTP(_p, _r, _b, _f | CLK_ENABLE_REG_32BIT)
#define SH_CLK_MSTP16(_p, _r, _b, _f) \
SH_CLK_MSTP(_p, _r, _b, _f | CLK_ENABLE_REG_16BIT)
#define SH_CLK_MSTP8(_p, _r, _b, _f) \
SH_CLK_MSTP(_p, _r, _b, _f | CLK_ENABLE_REG_8BIT)
int sh_clk_mstp_register(struct clk *clks, int nr);
/*
* MSTP registration never really cared about access size, despite the
* original enable/disable pairs assuming a 32-bit access. Clocks are
* responsible for defining their access sizes either directly or via the
* clock definition wrappers.
*/
static inline int __deprecated sh_clk_mstp32_register(struct clk *clks, int nr)
{
return sh_clk_mstp_register(clks, nr);
}
#define SH_CLK_DIV4(_parent, _reg, _shift, _div_bitmap, _flags) \
{ \