ptrace: revert "Prepare to fix racy accesses on task breakpoints"

[linux-2.6.git] / include / linux / regmap.h

#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 irq_domain;
struct spi_device;
struct regmap;
struct regmap_range_cfg;
struct regmap_field;

/* An enum of all the supported cache types */
enum regcache_type {
        REGCACHE_NONE,
        REGCACHE_RBTREE,
        REGCACHE_COMPRESSED,
        REGCACHE_FLAT,
};

/**
 * 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,
};

/**
 * A register range, used for access related checks
 * (readable/writeable/volatile/precious checks)
 *
 * @range_min: address of first register
 * @range_max: address of last register
 */
struct regmap_range {
        unsigned int range_min;
        unsigned int range_max;
};

/*
 * A table of ranges including some yes ranges and some no ranges.
 * If a register belongs to a no_range, the corresponding check function
 * will return false. If a register belongs to a yes range, the corresponding
 * check function will return true. "no_ranges" are searched first.
 *
 * @yes_ranges : pointer to an array of regmap ranges used as "yes ranges"
 * @n_yes_ranges: size of the above array
 * @no_ranges: pointer to an array of regmap ranges used as "no ranges"
 * @n_no_ranges: size of the above array
 */
struct regmap_access_table {
        const struct regmap_range *yes_ranges;
        unsigned int n_yes_ranges;
        const struct regmap_range *no_ranges;
        unsigned int n_no_ranges;
};

typedef void (*regmap_lock)(void *);
typedef void (*regmap_unlock)(void *);

/**
 * 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. If this field is NULL but wr_table
 *                 (see below) is not, the check is performed on such table
 *                 (a register is writeable if it belongs to one of the ranges
 *                  specified by wr_table).
 * @readable_reg: Optional callback returning true if the register
 *                can be read from. If this field is NULL but rd_table
 *                 (see below) is not, the check is performed on such table
 *                 (a register is readable if it belongs to one of the ranges
 *                  specified by rd_table).
 * @volatile_reg: Optional callback returning true if the register
 *                value can't be cached. If this field is NULL but
 *                volatile_table (see below) is not, the check is performed on
 *                such table (a register is volatile if it belongs to one of
 *                the ranges specified by volatile_table).
 * @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). If this
 *                field is NULL but precious_table (see below) is not, the
 *                check is performed on such table (a register is precious if
 *                it belongs to one of the ranges specified by precious_table).
 * @lock:         Optional lock callback (overrides regmap's default lock
 *                function, based on spinlock or mutex).
 * @unlock:       As above for unlocking.
 * @lock_arg:     this field is passed as the only argument of lock/unlock
 *                functions (ignored in case regular lock/unlock functions
 *                are not overridden).
 * @reg_read:     Optional callback that if filled will be used to perform
 *                all the reads from the registers. Should only be provided for
 *                devices whos read operation cannot be represented as a simple read
 *                operation on a bus such as SPI, I2C, etc. Most of the devices do
 *                not need this.
 * @reg_write:    Same as above for writing.
 * @fast_io:      Register IO is fast. Use a spinlock instead of a mutex
 *                to perform locking. This field is ignored if custom lock/unlock
 *                functions are used (see fields lock/unlock of struct regmap_config).
 *                This field is a duplicate of a similar file in
 *                'struct regmap_bus' and serves exact same purpose.
 *                 Use it only for "no-bus" cases.
 * @max_register: Optional, specifies the maximum valid register index.
 * @wr_table:     Optional, points to a struct regmap_access_table specifying
 *                valid ranges for write access.
 * @rd_table:     As above, for read access.
 * @volatile_table: As above, for volatile registers.
 * @precious_table: As above, for precious registers.
 * @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);
        regmap_lock lock;
        regmap_unlock unlock;
        void *lock_arg;

        int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
        int (*reg_write)(void *context, unsigned int reg, unsigned int val);

        bool fast_io;

        unsigned int max_register;
        const struct regmap_access_table *wr_table;
        const struct regmap_access_table *rd_table;
        const struct regmap_access_table *volatile_table;
        const struct regmap_access_table *precious_table;
        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 num_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.
 *
 * @name: Descriptive name for diagnostics
 *
 * @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 {
        const char *name;

        /* 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;
};

struct regmap_async;

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_async_write)(void *context,
                                     const void *reg, size_t reg_len,
                                     const void *val, size_t val_len,
                                     struct regmap_async *async);
typedef int (*regmap_hw_read)(void *context,
                              const void *reg_buf, size_t reg_size,
                              void *val_buf, size_t val_size);
typedef struct regmap_async *(*regmap_hw_async_alloc)(void);
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. This field is ignored if custom lock/unlock
 *           functions are used (see fields lock/unlock of
 *           struct regmap_config).
 * @write: Write operation.
 * @gather_write: Write operation with split register/value, return -ENOTSUPP
 *                if not implemented  on a given device.
 * @async_write: Write operation which completes asynchronously, optional and
 *               must serialise with respect to non-async I/O.
 * @read: Read operation.  Data is returned in the buffer used to transmit
 *         data.
 * @async_alloc: Allocate a regmap_async() structure.
 * @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.
 * @async_size: Size of struct used for async work.
 */
struct regmap_bus {
        bool fast_io;
        regmap_hw_write write;
        regmap_hw_gather_write gather_write;
        regmap_hw_async_write async_write;
        regmap_hw_read read;
        regmap_hw_free_context free_context;
        regmap_hw_async_alloc async_alloc;
        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_clk(struct device *dev, const char *clk_id,
                                    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_clk(struct device *dev, const char *clk_id,
                                         void __iomem *regs,
                                         const struct regmap_config *config);

/**
 * regmap_init_mmio(): Initialise register map
 *
 * @dev: Device that will be interacted with
 * @regs: Pointer to memory-mapped IO region
 * @config: Configuration for register map
 *
 * The return value will be an ERR_PTR() on error or a valid pointer to
 * a struct regmap.
 */
static inline struct regmap *regmap_init_mmio(struct device *dev,
                                        void __iomem *regs,
                                        const struct regmap_config *config)
{
        return regmap_init_mmio_clk(dev, NULL, regs, config);
}

/**
 * devm_regmap_init_mmio(): Initialise managed register map
 *
 * @dev: Device that will be interacted with
 * @regs: Pointer to memory-mapped IO region
 * @config: Configuration for register map
 *
 * The return value will be an ERR_PTR() on error or a valid pointer
 * to a struct regmap.  The regmap will be automatically freed by the
 * device management code.
 */
static inline struct regmap *devm_regmap_init_mmio(struct device *dev,
                                        void __iomem *regs,
                                        const struct regmap_config *config)
{
        return devm_regmap_init_mmio_clk(dev, NULL, regs, 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_raw_write_async(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);
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 regmap_async_complete(struct regmap *map);
bool regmap_can_raw_write(struct regmap *map);

int regcache_sync(struct regmap *map);
int regcache_sync_region(struct regmap *map, unsigned int min,
                         unsigned int max);
int regcache_drop_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);

bool regmap_check_range_table(struct regmap *map, unsigned int reg,
                              const struct regmap_access_table *table);

int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
                          int num_regs);

static inline bool regmap_reg_in_range(unsigned int reg,
                                       const struct regmap_range *range)
{
        return reg >= range->range_min && reg <= range->range_max;
}

bool regmap_reg_in_ranges(unsigned int reg,
                          const struct regmap_range *ranges,
                          unsigned int nranges);

/**
 * Description of an register field
 *
 * @reg: Offset of the register within the regmap bank
 * @lsb: lsb of the register field.
 * @reg: msb of the register field.
 */
struct reg_field {
        unsigned int reg;
        unsigned int lsb;
        unsigned int msb;
};

#define REG_FIELD(_reg, _lsb, _msb) {           \
                                .reg = _reg,    \
                                .lsb = _lsb,    \
                                .msb = _msb,    \
                                }

struct regmap_field *regmap_field_alloc(struct regmap *regmap,
                struct reg_field reg_field);
void regmap_field_free(struct regmap_field *field);

struct regmap_field *devm_regmap_field_alloc(struct device *dev,
                struct regmap *regmap, struct reg_field reg_field);
void devm_regmap_field_free(struct device *dev, struct regmap_field *field);

int regmap_field_read(struct regmap_field *field, unsigned int *val);
int regmap_field_write(struct regmap_field *field, unsigned int val);

/**
 * 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.
 * @runtime_pm:  Hold a runtime PM lock on the device when accessing it.
 *
 * @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;
        unsigned int mask_invert;
        unsigned int wake_invert;
        bool runtime_pm;

        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);
struct irq_domain *regmap_irq_get_domain(struct regmap_irq_chip_data *data);

#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_raw_write_async(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 int regcache_drop_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 void regmap_async_complete(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