201 lines
6.6 KiB
C
201 lines
6.6 KiB
C
#ifndef __LINUX_REGMAP_H
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#define __LINUX_REGMAP_H
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/*
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* Register map access API
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*
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* Copyright 2011 Wolfson Microelectronics plc
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/device.h>
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#include <linux/list.h>
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struct module;
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struct i2c_client;
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struct spi_device;
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/* An enum of all the supported cache types */
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enum regcache_type {
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REGCACHE_NONE,
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REGCACHE_RBTREE,
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REGCACHE_COMPRESSED
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};
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/**
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* Default value for a register. We use an array of structs rather
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* than a simple array as many modern devices have very sparse
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* register maps.
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*
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* @reg: Register address.
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* @def: Register default value.
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*/
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struct reg_default {
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unsigned int reg;
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unsigned int def;
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};
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/**
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* Configuration for the register map of a device.
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*
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* @reg_bits: Number of bits in a register address, mandatory.
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* @val_bits: Number of bits in a register value, mandatory.
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*
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* @writeable_reg: Optional callback returning true if the register
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* can be written to.
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* @readable_reg: Optional callback returning true if the register
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* can be read from.
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* @volatile_reg: Optional callback returning true if the register
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* value can't be cached.
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* @precious_reg: Optional callback returning true if the rgister
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* should not be read outside of a call from the driver
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* (eg, a clear on read interrupt status register).
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*
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* @max_register: Optional, specifies the maximum valid register index.
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* @reg_defaults: Power on reset values for registers (for use with
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* register cache support).
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* @num_reg_defaults: Number of elements in reg_defaults.
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*
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* @read_flag_mask: Mask to be set in the top byte of the register when doing
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* a read.
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* @write_flag_mask: Mask to be set in the top byte of the register when doing
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* a write. If both read_flag_mask and write_flag_mask are
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* empty the regmap_bus default masks are used.
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*
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* @cache_type: The actual cache type.
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* @reg_defaults_raw: Power on reset values for registers (for use with
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* register cache support).
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* @num_reg_defaults_raw: Number of elements in reg_defaults_raw.
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*/
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struct regmap_config {
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int reg_bits;
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int val_bits;
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bool (*writeable_reg)(struct device *dev, unsigned int reg);
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bool (*readable_reg)(struct device *dev, unsigned int reg);
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bool (*volatile_reg)(struct device *dev, unsigned int reg);
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bool (*precious_reg)(struct device *dev, unsigned int reg);
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unsigned int max_register;
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const struct reg_default *reg_defaults;
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unsigned int num_reg_defaults;
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enum regcache_type cache_type;
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const void *reg_defaults_raw;
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unsigned int num_reg_defaults_raw;
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u8 read_flag_mask;
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u8 write_flag_mask;
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};
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typedef int (*regmap_hw_write)(struct device *dev, const void *data,
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size_t count);
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typedef int (*regmap_hw_gather_write)(struct device *dev,
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const void *reg, size_t reg_len,
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const void *val, size_t val_len);
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typedef int (*regmap_hw_read)(struct device *dev,
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const void *reg_buf, size_t reg_size,
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void *val_buf, size_t val_size);
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/**
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* Description of a hardware bus for the register map infrastructure.
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*
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* @write: Write operation.
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* @gather_write: Write operation with split register/value, return -ENOTSUPP
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* if not implemented on a given device.
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* @read: Read operation. Data is returned in the buffer used to transmit
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* data.
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* @read_flag_mask: Mask to be set in the top byte of the register when doing
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* a read.
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*/
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struct regmap_bus {
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regmap_hw_write write;
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regmap_hw_gather_write gather_write;
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regmap_hw_read read;
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u8 read_flag_mask;
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};
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struct regmap *regmap_init(struct device *dev,
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const struct regmap_bus *bus,
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const struct regmap_config *config);
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struct regmap *regmap_init_i2c(struct i2c_client *i2c,
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const struct regmap_config *config);
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struct regmap *regmap_init_spi(struct spi_device *dev,
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const struct regmap_config *config);
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void regmap_exit(struct regmap *map);
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int regmap_reinit_cache(struct regmap *map,
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const struct regmap_config *config);
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int regmap_write(struct regmap *map, unsigned int reg, unsigned int val);
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int regmap_raw_write(struct regmap *map, unsigned int reg,
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const void *val, size_t val_len);
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int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val);
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int regmap_raw_read(struct regmap *map, unsigned int reg,
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void *val, size_t val_len);
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int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
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size_t val_count);
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int regmap_update_bits(struct regmap *map, unsigned int reg,
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unsigned int mask, unsigned int val);
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int regmap_update_bits_check(struct regmap *map, unsigned int reg,
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unsigned int mask, unsigned int val,
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bool *change);
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int regcache_sync(struct regmap *map);
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void regcache_cache_only(struct regmap *map, bool enable);
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void regcache_cache_bypass(struct regmap *map, bool enable);
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void regcache_mark_dirty(struct regmap *map);
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/**
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* Description of an IRQ for the generic regmap irq_chip.
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*
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* @reg_offset: Offset of the status/mask register within the bank
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* @mask: Mask used to flag/control the register.
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*/
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struct regmap_irq {
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unsigned int reg_offset;
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unsigned int mask;
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};
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/**
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* Description of a generic regmap irq_chip. This is not intended to
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* handle every possible interrupt controller, but it should handle a
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* substantial proportion of those that are found in the wild.
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*
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* @name: Descriptive name for IRQ controller.
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*
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* @status_base: Base status register address.
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* @mask_base: Base mask register address.
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* @ack_base: Base ack address. If zero then the chip is clear on read.
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*
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* @num_regs: Number of registers in each control bank.
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* @irqs: Descriptors for individual IRQs. Interrupt numbers are
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* assigned based on the index in the array of the interrupt.
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* @num_irqs: Number of descriptors.
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*/
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struct regmap_irq_chip {
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const char *name;
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unsigned int status_base;
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unsigned int mask_base;
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unsigned int ack_base;
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int num_regs;
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const struct regmap_irq *irqs;
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int num_irqs;
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};
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struct regmap_irq_chip_data;
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int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
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int irq_base, struct regmap_irq_chip *chip,
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struct regmap_irq_chip_data **data);
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void regmap_del_irq_chip(int irq, struct regmap_irq_chip_data *data);
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int regmap_irq_chip_get_base(struct regmap_irq_chip_data *data);
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#endif
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