include/regmap.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Copyright (c) 2015 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #ifndef __REGMAP_H
   8 #define __REGMAP_H
   9
  10 /**
  11  * struct regmap_range - a register map range
  12  *
  13  * @start:      Start address
  14  * @size:       Size in bytes
  15  */
  16 struct regmap_range {
  17         ulong start;
  18         ulong size;
  19 };
  20
  21 /**
  22  * struct regmap - a way of accessing hardware/bus registers
  23  *
  24  * @range_count: Number of ranges available within the map
  25  * @ranges:     Array of ranges
  26  */
  27 struct regmap {
  28         int range_count;
  29         struct regmap_range ranges[0];
  30 };
  31
  32 /*
  33  * Interface to provide access to registers either through a direct memory
  34  * bus or through a peripheral bus like I2C, SPI.
  35  */
  36 int regmap_write(struct regmap *map, uint offset, uint val);
  37 int regmap_read(struct regmap *map, uint offset, uint *valp);
  38
  39 #define regmap_write32(map, ptr, member, val) \
  40         regmap_write(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), val)
  41
  42 #define regmap_read32(map, ptr, member, valp) \
  43         regmap_read(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), valp)
  44
  45 /**
  46  * regmap_update_bits() - Perform a read/modify/write using a mask
  47  *
  48  * @map:        The map returned by regmap_init_mem*()
  49  * @offset:     Offset of the memory
  50  * @mask:       Mask to apply to the read value
  51  * @val:        Value to apply to the value to write
  52  */
  53 int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val);
  54
  55 /**
  56  * regmap_init_mem() - Set up a new register map that uses memory access
  57  *
  58  * Use regmap_uninit() to free it.
  59  *
  60  * @node:       Device node that uses this map
  61  * @mapp:       Returns allocated map
  62  */
  63 int regmap_init_mem(ofnode node, struct regmap **mapp);
  64
  65 /**
  66  * regmap_init_mem_platdata() - Set up a new memory register map for of-platdata
  67  *
  68  * This creates a new regmap with a list of regions passed in, rather than
  69  * using the device tree. It only supports 32-bit machines.
  70  *
  71  * Use regmap_uninit() to free it.
  72  *
  73  * @dev:        Device that uses this map
  74  * @reg:        List of address, size pairs
  75  * @count:      Number of pairs (e.g. 1 if the regmap has a single entry)
  76  * @mapp:       Returns allocated map
  77  */
  78 int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count,
  79                              struct regmap **mapp);
  80
  81 /**
  82  * regmap_get_range() - Obtain the base memory address of a regmap range
  83  *
  84  * @map:        Regmap to query
  85  * @range_num:  Range to look up
  86  */
  87 void *regmap_get_range(struct regmap *map, unsigned int range_num);
  88
  89 /**
  90  * regmap_uninit() - free a previously inited regmap
  91  */
  92 int regmap_uninit(struct regmap *map);
  93
  94 #endif