The regmap functions currently assume that all register map accesses have a data width of 32 bits, but there are maps that have different widths.
To rectify this, implement the regmap_raw_read and regmap_raw_write functions from the Linux kernel API that specify the width of a desired read or write operation on a regmap.
Implement the regmap_read and regmap_write functions using these raw functions in a backwards-compatible manner.
Reviewed-by: Anatolij Gustschin agust@denx.de Signed-off-by: Mario Six mario.six@gdsys.cc
---
v3 -> v4: * Switched 'ranges[0] + offset' to 'ranges[0].start + offset' * Explained the difference between the raw and non-raw read/write functions better in the docs
v2 -> v3: * Implement the "raw" functions from Linux instead of adding a size parameter to the regmap_{read,write} functions * Fixed style violation * Improved error handling
v1 -> v2: New in v2
--- drivers/core/regmap.c | 54 ++++++++++++++++++++++++++++++++++++++++++------- include/regmap.h | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 103 insertions(+), 7 deletions(-)
diff --git a/drivers/core/regmap.c b/drivers/core/regmap.c index 154426269d9..87c4c950a63 100644 --- a/drivers/core/regmap.c +++ b/drivers/core/regmap.c @@ -188,22 +188,62 @@ int regmap_uninit(struct regmap *map) return 0; }
+int regmap_raw_read(struct regmap *map, uint offset, void *valp, size_t val_len) +{ + void *ptr; + + ptr = map_physmem(map->ranges[0].start + offset, val_len, MAP_NOCACHE); + + switch (val_len) { + case REGMAP_SIZE_8: + *((u8 *)valp) = in_8((u8 *)ptr); + break; + case REGMAP_SIZE_16: + *((u16 *)valp) = in_le16((u16 *)ptr); + break; + case REGMAP_SIZE_32: + *((u32 *)valp) = in_le32((u32 *)ptr); + break; + default: + debug("%s: regmap size %u unknown\n", __func__, val_len); + return -EINVAL; + } + return 0; +} + int regmap_read(struct regmap *map, uint offset, uint *valp) { - u32 *ptr = map_physmem(map->ranges[0].start + offset, 4, MAP_NOCACHE); + return regmap_raw_read(map, offset, valp, REGMAP_SIZE_32); +}
- *valp = le32_to_cpu(readl(ptr)); +int regmap_raw_write(struct regmap *map, uint offset, const void *val, + size_t val_len) +{ + void *ptr; + + ptr = map_physmem(map->ranges[0].start + offset, val_len, MAP_NOCACHE); + + switch (val_len) { + case REGMAP_SIZE_8: + out_8((u8 *)ptr, *((u8 *)val)); + break; + case REGMAP_SIZE_16: + out_le16((u16 *)ptr, *((u16 *)val)); + break; + case REGMAP_SIZE_32: + out_le32((u32 *)ptr, *((u32 *)val)); + break; + default: + debug("%s: regmap size %u unknown\n", __func__, val_len); + return -EINVAL; + }
return 0; }
int regmap_write(struct regmap *map, uint offset, uint val) { - u32 *ptr = map_physmem(map->ranges[0].start + offset, 4, MAP_NOCACHE); - - writel(cpu_to_le32(val), ptr); - - return 0; + return regmap_raw_write(map, offset, &val, REGMAP_SIZE_32); }
int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val) diff --git a/include/regmap.h b/include/regmap.h index 32f75e06f59..46ae4ed0a03 100644 --- a/include/regmap.h +++ b/include/regmap.h @@ -8,6 +8,19 @@ #define __REGMAP_H
/** + * enum regmap_size_t - Access sizes for fpgamap reads and writes + * + * @REGMAP_SIZE_8: 8-bit read/write access size + * @REGMAP_SIZE_16: 16-bit read/write access size + * @REGMAP_SIZE_32: 32-bit read/write access size + */ +enum regmap_size_t { + REGMAP_SIZE_8 = 1, + REGMAP_SIZE_16 = 2, + REGMAP_SIZE_32 = 4, +}; + +/** * struct regmap_range - a register map range * * @start: Start address @@ -41,6 +54,10 @@ struct regmap { * @offset: Offset in the regmap to write to * @val: Data to write to the regmap at the specified offset * + * Note that this function will only write values of 32 bit width to the + * regmap; if the size of data to be read is different, the regmap_raw_write + * function can be used. + * * Return: 0 if OK, -ve on error */ int regmap_write(struct regmap *map, uint offset, uint val); @@ -53,10 +70,49 @@ int regmap_write(struct regmap *map, uint offset, uint val); * @valp: Pointer to the buffer to receive the data read from the regmap * at the specified offset * + * Note that this function will only read values of 32 bit width from the + * regmap; if the size of data to be read is different, the regmap_raw_read + * function can be used. + * * Return: 0 if OK, -ve on error */ int regmap_read(struct regmap *map, uint offset, uint *valp);
+/** + * regmap_raw_write() - Write a value of specified length to a regmap + * + * @map: Regmap to write to + * @offset: Offset in the regmap to write to + * @val: Value to write to the regmap at the specified offset + * @val_len: Length of the data to be written to the regmap + * + * Note that this function will, as opposed to regmap_write, write data of + * arbitrary length to the regmap, and not just 32-bit values, and is thus a + * generalized version of regmap_write. + * + * Return: 0 if OK, -ve on error + */ +int regmap_raw_write(struct regmap *map, uint offset, const void *val, + size_t val_len); + +/** + * regmap_raw_read() - Read a value of specified length from a regmap + * + * @map: Regmap to read from + * @offset: Offset in the regmap to read from + * @valp: Pointer to the buffer to receive the data read from the regmap + * at the specified offset + * @val_len: Length of the data to be read from the regmap + * + * Note that this function will, as opposed to regmap_read, read data of + * arbitrary length from the regmap, and not just 32-bit values, and is thus a + * generalized version of regmap_read. + * + * Return: 0 if OK, -ve on error + */ +int regmap_raw_read(struct regmap *map, uint offset, void *valp, + size_t val_len); + #define regmap_write32(map, ptr, member, val) \ regmap_write(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), val)
-- 2.11.0