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dm: regmap: Implement simple regmap_read & regmap_write 

The regmap_read & regmap_write functions were previously declared in
regmap.h but not implemented anywhere. The regmap implementation &
commit message of 6f98b7504f ("dm: Add support for register maps
(regmap)") indicate that only memory mapped accesses are supported for
now, so providing simple implementations of regmap_read & regmap_write
is trivial. The access size is presumed to be 4 bytes & endianness is
presumed native, which are the defaults for the regmap code in Linux.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Paul Burton 2016-09-08 07:47:35 +01:00 committed by Daniel Schwierzeck
parent 96cb57c5ea
commit 3bfb8cb43b
1 changed files with 20 additions and 0 deletions
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20
drivers/core/regmap.c
View File

@ -13,6 +13,8 @@
#include <mapmem.h>
#include <regmap.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
static struct regmap *regmap_alloc_count(int count)
@ -117,3 +119,21 @@ int regmap_uninit(struct regmap *map)
return 0;
}
int regmap_read(struct regmap *map, uint offset, uint *valp)
{
uint32_t *ptr = map_physmem(map->base + offset, 4, MAP_NOCACHE);
*valp = le32_to_cpu(readl(ptr));
return 0;
}
int regmap_write(struct regmap *map, uint offset, uint val)
{
uint32_t *ptr = map_physmem(map->base + offset, 4, MAP_NOCACHE);
writel(cpu_to_le32(val), ptr);
return 0;
}