linux-sg2042/include/linux/regmap.h

436 lines
14 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/list.h>
#include <linux/rbtree.h>
struct module;
struct device;
struct i2c_client;
struct spi_device;
struct regmap;
struct regmap_range_cfg;
/* An enum of all the supported cache types */
enum regcache_type {
REGCACHE_NONE,
REGCACHE_RBTREE,
REGCACHE_COMPRESSED
};
/**
* 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;
};
#ifdef CONFIG_REGMAP
enum regmap_endian {
/* Unspecified -> 0 -> Backwards compatible default */
REGMAP_ENDIAN_DEFAULT = 0,
REGMAP_ENDIAN_BIG,
REGMAP_ENDIAN_LITTLE,
REGMAP_ENDIAN_NATIVE,
};
/**
* Configuration for the register map of a device.
*
* @name: Optional name of the regmap. Useful when a device has multiple
* register regions.
*
* @reg_bits: Number of bits in a register address, mandatory.
* @reg_stride: The register address stride. Valid register addresses are a
* multiple of this value. If set to 0, a value of 1 will be
* used.
* @pad_bits: Number of bits of padding between register and value.
* @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.
* @use_single_rw: If set, converts the bulk read and write operations into
* a series of single read and write operations. This is useful
* for device that does not support bulk read and write.
*
* @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.
* @reg_format_endian: Endianness for formatted register addresses. If this is
* DEFAULT, the @reg_format_endian_default value from the
* regmap bus is used.
* @val_format_endian: Endianness for formatted register values. If this is
* DEFAULT, the @reg_format_endian_default value from the
* regmap bus is used.
*
* @ranges: Array of configuration entries for virtual address ranges.
* @num_ranges: Number of range configuration entries.
*/
struct regmap_config {
const char *name;
int reg_bits;
int reg_stride;
int pad_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;
const 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;
bool use_single_rw;
enum regmap_endian reg_format_endian;
enum regmap_endian val_format_endian;
const struct regmap_range_cfg *ranges;
unsigned int n_ranges;
};
/**
* Configuration for indirectly accessed or paged registers.
* Registers, mapped to this virtual range, are accessed in two steps:
* 1. page selector register update;
* 2. access through data window registers.
*
* @range_min: Address of the lowest register address in virtual range.
* @range_max: Address of the highest register in virtual range.
*
* @page_sel_reg: Register with selector field.
* @page_sel_mask: Bit shift for selector value.
* @page_sel_shift: Bit mask for selector value.
*
* @window_start: Address of first (lowest) register in data window.
* @window_len: Number of registers in data window.
*/
struct regmap_range_cfg {
/* Registers of virtual address range */
unsigned int range_min;
unsigned int range_max;
/* Page selector for indirect addressing */
unsigned int selector_reg;
unsigned int selector_mask;
int selector_shift;
/* Data window (per each page) */
unsigned int window_start;
unsigned int window_len;
};
typedef int (*regmap_hw_write)(void *context, const void *data,
size_t count);
typedef int (*regmap_hw_gather_write)(void *context,
const void *reg, size_t reg_len,
const void *val, size_t val_len);
typedef int (*regmap_hw_read)(void *context,
const void *reg_buf, size_t reg_size,
void *val_buf, size_t val_size);
typedef void (*regmap_hw_free_context)(void *context);
/**
* Description of a hardware bus for the register map infrastructure.
*
* @fast_io: Register IO is fast. Use a spinlock instead of a mutex
* to perform locking.
* @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.
* @reg_format_endian_default: Default endianness for formatted register
* addresses. Used when the regmap_config specifies DEFAULT. If this is
* DEFAULT, BIG is assumed.
* @val_format_endian_default: Default endianness for formatted register
* values. Used when the regmap_config specifies DEFAULT. If this is
* DEFAULT, BIG is assumed.
*/
struct regmap_bus {
bool fast_io;
regmap_hw_write write;
regmap_hw_gather_write gather_write;
regmap_hw_read read;
regmap_hw_free_context free_context;
u8 read_flag_mask;
enum regmap_endian reg_format_endian_default;
enum regmap_endian val_format_endian_default;
};
struct regmap *regmap_init(struct device *dev,
const struct regmap_bus *bus,
void *bus_context,
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);
struct regmap *regmap_init_mmio(struct device *dev,
void __iomem *regs,
const struct regmap_config *config);
struct regmap *devm_regmap_init(struct device *dev,
const struct regmap_bus *bus,
void *bus_context,
const struct regmap_config *config);
struct regmap *devm_regmap_init_i2c(struct i2c_client *i2c,
const struct regmap_config *config);
struct regmap *devm_regmap_init_spi(struct spi_device *dev,
const struct regmap_config *config);
struct regmap *devm_regmap_init_mmio(struct device *dev,
void __iomem *regs,
const struct regmap_config *config);
void regmap_exit(struct regmap *map);
int regmap_reinit_cache(struct regmap *map,
const struct regmap_config *config);
struct regmap *dev_get_regmap(struct device *dev, const char *name);
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_bulk_write(struct regmap *map, unsigned int reg, const void *val,
size_t val_count);
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);
int regmap_update_bits_check(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val,
bool *change);
int regmap_get_val_bytes(struct regmap *map);
int regcache_sync(struct regmap *map);
int regcache_sync_region(struct regmap *map, unsigned int min,
unsigned int max);
void regcache_cache_only(struct regmap *map, bool enable);
void regcache_cache_bypass(struct regmap *map, bool enable);
void regcache_mark_dirty(struct regmap *map);
int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
int num_regs);
/**
* Description of an IRQ for the generic regmap irq_chip.
*
* @reg_offset: Offset of the status/mask register within the bank
* @mask: Mask used to flag/control the register.
*/
struct regmap_irq {
unsigned int reg_offset;
unsigned int mask;
};
/**
* Description of a generic regmap irq_chip. This is not intended to
* handle every possible interrupt controller, but it should handle a
* substantial proportion of those that are found in the wild.
*
* @name: Descriptive name for IRQ controller.
*
* @status_base: Base status register address.
* @mask_base: Base mask register address.
* @ack_base: Base ack address. If zero then the chip is clear on read.
* @wake_base: Base address for wake enables. If zero unsupported.
* @irq_reg_stride: Stride to use for chips where registers are not contiguous.
*
* @num_regs: Number of registers in each control bank.
* @irqs: Descriptors for individual IRQs. Interrupt numbers are
* assigned based on the index in the array of the interrupt.
* @num_irqs: Number of descriptors.
*/
struct regmap_irq_chip {
const char *name;
unsigned int status_base;
unsigned int mask_base;
unsigned int ack_base;
unsigned int wake_base;
unsigned int irq_reg_stride;
int num_regs;
const struct regmap_irq *irqs;
int num_irqs;
};
struct regmap_irq_chip_data;
int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
int irq_base, const struct regmap_irq_chip *chip,
struct regmap_irq_chip_data **data);
void regmap_del_irq_chip(int irq, struct regmap_irq_chip_data *data);
int regmap_irq_chip_get_base(struct regmap_irq_chip_data *data);
int regmap_irq_get_virq(struct regmap_irq_chip_data *data, int irq);
#else
/*
* These stubs should only ever be called by generic code which has
* regmap based facilities, if they ever get called at runtime
* something is going wrong and something probably needs to select
* REGMAP.
*/
static inline int regmap_write(struct regmap *map, unsigned int reg,
unsigned int val)
{
WARN_ONCE(1, "regmap API is disabled");
return -EINVAL;
}
static inline int regmap_raw_write(struct regmap *map, unsigned int reg,
const void *val, size_t val_len)
{
WARN_ONCE(1, "regmap API is disabled");
return -EINVAL;
}
static inline int regmap_bulk_write(struct regmap *map, unsigned int reg,
const void *val, size_t val_count)
{
WARN_ONCE(1, "regmap API is disabled");
return -EINVAL;
}
static inline int regmap_read(struct regmap *map, unsigned int reg,
unsigned int *val)
{
WARN_ONCE(1, "regmap API is disabled");
return -EINVAL;
}
static inline int regmap_raw_read(struct regmap *map, unsigned int reg,
void *val, size_t val_len)
{
WARN_ONCE(1, "regmap API is disabled");
return -EINVAL;
}
static inline int regmap_bulk_read(struct regmap *map, unsigned int reg,
void *val, size_t val_count)
{
WARN_ONCE(1, "regmap API is disabled");
return -EINVAL;
}
static inline int regmap_update_bits(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val)
{
WARN_ONCE(1, "regmap API is disabled");
return -EINVAL;
}
static inline int regmap_update_bits_check(struct regmap *map,
unsigned int reg,
unsigned int mask, unsigned int val,
bool *change)
{
WARN_ONCE(1, "regmap API is disabled");
return -EINVAL;
}
static inline int regmap_get_val_bytes(struct regmap *map)
{
WARN_ONCE(1, "regmap API is disabled");
return -EINVAL;
}
static inline int regcache_sync(struct regmap *map)
{
WARN_ONCE(1, "regmap API is disabled");
return -EINVAL;
}
static inline int regcache_sync_region(struct regmap *map, unsigned int min,
unsigned int max)
{
WARN_ONCE(1, "regmap API is disabled");
return -EINVAL;
}
static inline void regcache_cache_only(struct regmap *map, bool enable)
{
WARN_ONCE(1, "regmap API is disabled");
}
static inline void regcache_cache_bypass(struct regmap *map, bool enable)
{
WARN_ONCE(1, "regmap API is disabled");
}
static inline void regcache_mark_dirty(struct regmap *map)
{
WARN_ONCE(1, "regmap API is disabled");
}
static inline int regmap_register_patch(struct regmap *map,
const struct reg_default *regs,
int num_regs)
{
WARN_ONCE(1, "regmap API is disabled");
return -EINVAL;
}
static inline struct regmap *dev_get_regmap(struct device *dev,
const char *name)
{
return NULL;
}
#endif
#endif