28644c809f
This patch adds support for the rbtree cache compression type. Each rbnode manages a variable length block of registers. There can be no two nodes with overlapping blocks. Each block has a base register and a currently top register, all the other registers, if any, lie in between these two and in ascending order. The reasoning behind the construction of this rbtree is simple. In the snd_soc_rbtree_cache_init() function, we iterate over the register defaults provided by the regcache core. For each register value that is non-zero we insert it in the rbtree. In order to determine in which rbnode we need to add the register, we first look if there is another register already added that is adjacent to the one we are about to add. If that is the case we append it in that rbnode block, otherwise we create a new rbnode with a single register in its block and add it to the tree. There are various optimizations across the implementation to speed up lookups by caching the most recently used rbnode. Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com> Tested-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
142 lines
4.7 KiB
C
142 lines
4.7 KiB
C
#ifndef __LINUX_REGMAP_H
|
|
#define __LINUX_REGMAP_H
|
|
|
|
/*
|
|
* Register map access API
|
|
*
|
|
* Copyright 2011 Wolfson Microelectronics plc
|
|
*
|
|
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/list.h>
|
|
#include <linux/module.h>
|
|
|
|
struct i2c_client;
|
|
struct spi_device;
|
|
|
|
/* An enum of all the supported cache types */
|
|
enum regcache_type {
|
|
REGCACHE_NONE,
|
|
REGCACHE_INDEXED,
|
|
REGCACHE_RBTREE,
|
|
};
|
|
|
|
/**
|
|
* Default value for a register. We use an array of structs rather
|
|
* than a simple array as many modern devices have very sparse
|
|
* register maps.
|
|
*
|
|
* @reg: Register address.
|
|
* @def: Register default value.
|
|
*/
|
|
struct reg_default {
|
|
unsigned int reg;
|
|
unsigned int def;
|
|
};
|
|
|
|
/**
|
|
* Configuration for the register map of a device.
|
|
*
|
|
* @reg_bits: Number of bits in a register address, mandatory.
|
|
* @val_bits: Number of bits in a register value, mandatory.
|
|
*
|
|
* @writeable_reg: Optional callback returning true if the register
|
|
* can be written to.
|
|
* @readable_reg: Optional callback returning true if the register
|
|
* can be read from.
|
|
* @volatile_reg: Optional callback returning true if the register
|
|
* value can't be cached.
|
|
* @precious_reg: Optional callback returning true if the rgister
|
|
* should not be read outside of a call from the driver
|
|
* (eg, a clear on read interrupt status register).
|
|
*
|
|
* @max_register: Optional, specifies the maximum valid register index.
|
|
* @reg_defaults: Power on reset values for registers (for use with
|
|
* register cache support).
|
|
* @num_reg_defaults: Number of elements in reg_defaults.
|
|
*
|
|
* @read_flag_mask: Mask to be set in the top byte of the register when doing
|
|
* a read.
|
|
* @write_flag_mask: Mask to be set in the top byte of the register when doing
|
|
* a write. If both read_flag_mask and write_flag_mask are
|
|
* empty the regmap_bus default masks are used.
|
|
*
|
|
* @cache_type: The actual cache type.
|
|
* @reg_defaults_raw: Power on reset values for registers (for use with
|
|
* register cache support).
|
|
* @num_reg_defaults_raw: Number of elements in reg_defaults_raw.
|
|
*/
|
|
struct regmap_config {
|
|
int reg_bits;
|
|
int val_bits;
|
|
|
|
bool (*writeable_reg)(struct device *dev, unsigned int reg);
|
|
bool (*readable_reg)(struct device *dev, unsigned int reg);
|
|
bool (*volatile_reg)(struct device *dev, unsigned int reg);
|
|
bool (*precious_reg)(struct device *dev, unsigned int reg);
|
|
|
|
unsigned int max_register;
|
|
struct reg_default *reg_defaults;
|
|
unsigned int num_reg_defaults;
|
|
enum regcache_type cache_type;
|
|
const void *reg_defaults_raw;
|
|
unsigned int num_reg_defaults_raw;
|
|
|
|
u8 read_flag_mask;
|
|
u8 write_flag_mask;
|
|
};
|
|
|
|
typedef int (*regmap_hw_write)(struct device *dev, const void *data,
|
|
size_t count);
|
|
typedef int (*regmap_hw_gather_write)(struct device *dev,
|
|
const void *reg, size_t reg_len,
|
|
const void *val, size_t val_len);
|
|
typedef int (*regmap_hw_read)(struct device *dev,
|
|
const void *reg_buf, size_t reg_size,
|
|
void *val_buf, size_t val_size);
|
|
|
|
/**
|
|
* Description of a hardware bus for the register map infrastructure.
|
|
*
|
|
* @write: Write operation.
|
|
* @gather_write: Write operation with split register/value, return -ENOTSUPP
|
|
* if not implemented on a given device.
|
|
* @read: Read operation. Data is returned in the buffer used to transmit
|
|
* data.
|
|
* @read_flag_mask: Mask to be set in the top byte of the register when doing
|
|
* a read.
|
|
*/
|
|
struct regmap_bus {
|
|
regmap_hw_write write;
|
|
regmap_hw_gather_write gather_write;
|
|
regmap_hw_read read;
|
|
u8 read_flag_mask;
|
|
};
|
|
|
|
struct regmap *regmap_init(struct device *dev,
|
|
const struct regmap_bus *bus,
|
|
const struct regmap_config *config);
|
|
struct regmap *regmap_init_i2c(struct i2c_client *i2c,
|
|
const struct regmap_config *config);
|
|
struct regmap *regmap_init_spi(struct spi_device *dev,
|
|
const struct regmap_config *config);
|
|
|
|
void regmap_exit(struct regmap *map);
|
|
int regmap_write(struct regmap *map, unsigned int reg, unsigned int val);
|
|
int regmap_raw_write(struct regmap *map, unsigned int reg,
|
|
const void *val, size_t val_len);
|
|
int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val);
|
|
int regmap_raw_read(struct regmap *map, unsigned int reg,
|
|
void *val, size_t val_len);
|
|
int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
|
|
size_t val_count);
|
|
int regmap_update_bits(struct regmap *map, unsigned int reg,
|
|
unsigned int mask, unsigned int val);
|
|
|
|
#endif
|