From: Pratyush Yadav Date: Thu, 24 Sep 2020 04:34:12 +0000 (+0530) Subject: regmap: Allow specifying read/write width X-Git-Url: http://git.dujemihanovic.xyz/%7B%7B%20%24style.RelPermalink%20%7D%7D?a=commitdiff_plain;h=78aaedba9f1b92335a4f0ce8344f6abf7a63dccb;p=u-boot.git regmap: Allow specifying read/write width Right now, regmap_read() and regmap_write() read/write a 32-bit value only. To write other lengths, regmap_raw_read() and regmap_raw_write() need to be used. This means that any driver ported from Linux that relies on regmap_{read,write}() to know the size already has to be updated at each callsite. This makes the port harder to maintain. So, allow specifying the read/write width to make it easier to port the drivers, since now the only change needed is when initializing the regmap. Signed-off-by: Pratyush Yadav Reviewed-by: Simon Glass --- diff --git a/drivers/core/regmap.c b/drivers/core/regmap.c index 809f58489f..c71b961234 100644 --- a/drivers/core/regmap.c +++ b/drivers/core/regmap.c @@ -25,6 +25,10 @@ DECLARE_GLOBAL_DATA_PTR; * regmap_alloc() - Allocate a regmap with a given number of ranges. * * @count: Number of ranges to be allocated for the regmap. + * + * The default regmap width is set to REGMAP_SIZE_32. Callers can override it + * if they need. + * * Return: A pointer to the newly allocated regmap, or NULL on error. */ static struct regmap *regmap_alloc(int count) @@ -36,6 +40,7 @@ static struct regmap *regmap_alloc(int count) if (!map) return NULL; map->range_count = count; + map->width = REGMAP_SIZE_32; return map; } @@ -244,7 +249,7 @@ struct regmap *devm_regmap_init(struct udevice *dev, const struct regmap_config *config) { int rc; - struct regmap **mapp; + struct regmap **mapp, *map; mapp = devres_alloc(devm_regmap_release, sizeof(struct regmap *), __GFP_ZERO); @@ -255,6 +260,10 @@ struct regmap *devm_regmap_init(struct udevice *dev, if (rc) return ERR_PTR(rc); + map = *mapp; + if (config) + map->width = config->width; + devres_add(dev, mapp); return *mapp; } @@ -377,7 +386,7 @@ int regmap_raw_read(struct regmap *map, uint offset, void *valp, size_t val_len) int regmap_read(struct regmap *map, uint offset, uint *valp) { - return regmap_raw_read(map, offset, valp, REGMAP_SIZE_32); + return regmap_raw_read(map, offset, valp, map->width); } static inline void __write_8(u8 *addr, const u8 *val, @@ -487,7 +496,7 @@ int regmap_raw_write(struct regmap *map, uint offset, const void *val, int regmap_write(struct regmap *map, uint offset, uint val) { - return regmap_raw_write(map, offset, &val, REGMAP_SIZE_32); + return regmap_raw_write(map, offset, &val, map->width); } int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val) diff --git a/include/regmap.h b/include/regmap.h index c7dd240a74..19474e6de1 100644 --- a/include/regmap.h +++ b/include/regmap.h @@ -76,16 +76,28 @@ struct regmap_range { }; struct regmap_bus; -struct regmap_config; + +/** + * struct regmap_config - Configure the behaviour of a regmap + * + * @width: Width of the read/write operations. Defaults to + * REGMAP_SIZE_32 if set to 0. + */ +struct regmap_config { + enum regmap_size_t width; +}; /** * struct regmap - a way of accessing hardware/bus registers * + * @width: Width of the read/write operations. Defaults to + * REGMAP_SIZE_32 if set to 0. * @range_count: Number of ranges available within the map * @ranges: Array of ranges */ struct regmap { enum regmap_endianness_t endianness; + enum regmap_size_t width; int range_count; struct regmap_range ranges[0]; }; @@ -96,32 +108,24 @@ struct regmap { */ /** - * regmap_write() - Write a 32-bit value to a regmap + * regmap_write() - Write a value to a regmap * * @map: Regmap to write to * @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); /** - * regmap_read() - Read a 32-bit value from a regmap + * regmap_read() - Read a value 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 * - * 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); @@ -135,8 +139,9 @@ int regmap_read(struct regmap *map, uint offset, uint *valp); * @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. + * arbitrary length to the regmap, and not just the size configured in the + * regmap (defaults to 32-bit) and is thus a generalized version of + * regmap_write. * * Return: 0 if OK, -ve on error */ @@ -153,8 +158,9 @@ int regmap_raw_write(struct regmap *map, uint offset, const void *val, * @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. + * arbitrary length from the regmap, and not just the size configured in the + * regmap (defaults to 32-bit) and is thus a generalized version of + * regmap_read. * * Return: 0 if OK, -ve on error */ @@ -344,7 +350,7 @@ int regmap_init_mem_index(ofnode node, struct regmap **mapp, int index); * @dev: Device that will be interacted with * @bus: Bus-specific callbacks to use with device (IGNORED) * @bus_context: Data passed to bus-specific callbacks (IGNORED) - * @config: Configuration for register map (IGNORED) + * @config: Configuration for register map * * @Return a valid pointer to a struct regmap or a ERR_PTR() on error. * The structure is automatically freed when the device is unbound