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regmap: mmio: Add regmap_mmio_get_min_stride

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Splite the minimal stride parsing into one signal function.

Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Xiubo Li 2015-12-03 13:27:21 +08:00 committed by Mark Brown
parent 9d98fa7129
commit 75fb0aaea1
1 changed files with 30 additions and 19 deletions
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49
drivers/base/regmap/regmap-mmio.c
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@ -61,6 +61,33 @@ static int regmap_mmio_regbits_check(size_t reg_bits)
}
}
static int regmap_mmio_get_min_stride(size_t val_bits)
{
int min_stride;
switch (val_bits) {
case 8:
/* The core treats 0 as 1 */
min_stride = 0;
return 0;
case 16:
min_stride = 2;
break;
case 32:
min_stride = 4;
break;
#ifdef CONFIG_64BIT
case 64:
min_stride = 8;
break;
#endif
default:
return -EINVAL;
}
return min_stride;
}
static inline void regmap_mmio_count_check(size_t count, u32 offset)
{
BUG_ON(count <= offset);
@ -231,25 +258,9 @@ static struct regmap_mmio_context *regmap_mmio_gen_context(struct device *dev,
if (config->pad_bits)
return ERR_PTR(-EINVAL);
switch (config->val_bits) {
case 8:
/* The core treats 0 as 1 */
min_stride = 0;
break;
case 16:
min_stride = 2;
break;
case 32:
min_stride = 4;
break;
#ifdef CONFIG_64BIT
case 64:
min_stride = 8;
break;
#endif
default:
return ERR_PTR(-EINVAL);
}
min_stride = regmap_mmio_get_min_stride(config->val_bits);
if (min_stride < 0)
return ERR_PTR(min_stride);
if (config->reg_stride < min_stride)
return ERR_PTR(-EINVAL);