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Diffstat (limited to 'include')
-rw-r--r-- | include/regmap.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/include/regmap.h b/include/regmap.h new file mode 100644 index 0000000..eccf770 --- /dev/null +++ b/include/regmap.h @@ -0,0 +1,72 @@ +/* + * Copyright (c) 2015 Google, Inc + * Written by Simon Glass <sjg@chromium.org> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef __REGMAP_H +#define __REGMAP_H + +/** + * struct regmap_range - a register map range + * + * @start: Start address + * @size: Size in bytes + */ +struct regmap_range { + ulong start; + ulong size; +}; + +/** + * struct regmap - a way of accessing hardware/bus registers + * + * @base: Base address of register map + * @range_count: Number of ranges available within the map + * @range: Pointer to the list of ranges, allocated if @range_count > 1 + * @base_range: If @range_count is <= 1, @range points here + */ +struct regmap { + phys_addr_t base; + int range_count; + struct regmap_range *range, base_range; +}; + +/* + * Interface to provide access to registers either through a direct memory + * bus or through a peripheral bus like I2C, SPI. + */ +int regmap_write(struct regmap *map, uint offset, uint val); +int regmap_read(struct regmap *map, uint offset, uint *valp); + +#define regmap_write32(map, ptr, member, val) \ + regmap_write(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), val) + +#define regmap_read32(map, ptr, member, valp) \ + regmap_read(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), valp) + +/** + * regmap_init_mem() - Set up a new register map that uses memory access + * + * Use regmap_uninit() to free it. + * + * @dev: Device that uses this map + * @mapp: Returns allocated map + */ +int regmap_init_mem(struct udevice *dev, struct regmap **mapp); + +/** + * regmap_get_range() - Obtain the base memory address of a regmap range + * + * @map: Regmap to query + * @range_num: Range to look up + */ +void *regmap_get_range(struct regmap *map, unsigned int range_num); + +/** + * regmap_uninit() - free a previously inited regmap + */ +int regmap_uninit(struct regmap *map); + +#endif |