/*
 * Register map access API internal header
 *
 * 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.
 */

#ifndef _REGMAP_INTERNAL_H
#define _REGMAP_INTERNAL_H

#include <linux/device.h>
#include <linux/regmap.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/wait.h>

struct regmap;
struct regcache_ops;

struct regmap_debugfs_off_cache {
        struct list_head list;
        off_t min;
        off_t max;
        unsigned int base_reg;
        unsigned int max_reg;
};

struct regmap_format {
        size_t buf_size;
        size_t reg_bytes;
        size_t pad_bytes;
        size_t val_bytes;
        void (*format_write)(struct regmap *map,
                             unsigned int reg, unsigned int val);
        void (*format_reg)(void *buf, unsigned int reg, unsigned int shift);
        void (*format_val)(void *buf, unsigned int val, unsigned int shift);
        unsigned int (*parse_val)(const void *buf);
        void (*parse_inplace)(void *buf);
};

struct regmap_async {
        struct list_head list;
        struct regmap *map;
        void *work_buf;
};

struct regmap {
        union {
                struct mutex mutex;
                struct {
                        spinlock_t spinlock;
                        unsigned long spinlock_flags;
                };
        };
        regmap_lock lock;
        regmap_unlock unlock;
        void *lock_arg; /* This is passed to lock/unlock functions */
        gfp_t alloc_flags;

        struct device *dev; /* Device we do I/O on */
        void *work_buf;     /* Scratch buffer used to format I/O */
        struct regmap_format format;  /* Buffer format */
        const struct regmap_bus *bus;
        void *bus_context;
        const char *name;

        bool async;
        spinlock_t async_lock;
        wait_queue_head_t async_waitq;
        struct list_head async_list;
        struct list_head async_free;
        int async_ret;

#ifdef CONFIG_DEBUG_FS
        struct dentry *debugfs;
        const char *debugfs_name;

        unsigned int debugfs_reg_len;
        unsigned int debugfs_val_len;
        unsigned int debugfs_tot_len;

        struct list_head debugfs_off_cache;
        struct mutex cache_lock;
#endif

        unsigned int max_register;
        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);
        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;

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

        bool defer_caching;

        u8 read_flag_mask;
        u8 write_flag_mask;

        /* number of bits to (left) shift the reg value when formatting*/
        int reg_shift;
        int reg_stride;
        int reg_stride_order;

        /* regcache specific members */
        const struct regcache_ops *cache_ops;
        enum regcache_type cache_type;

        /* number of bytes in reg_defaults_raw */
        unsigned int cache_size_raw;
        /* number of bytes per word in reg_defaults_raw */
        unsigned int cache_word_size;
        /* number of entries in reg_defaults */
        unsigned int num_reg_defaults;
        /* number of entries in reg_defaults_raw */
        unsigned int num_reg_defaults_raw;

        /* if set, only the cache is modified not the HW */
        bool cache_only;
        /* if set, only the HW is modified not the cache */
        bool cache_bypass;
        /* if set, remember to free reg_defaults_raw */
        bool cache_free;

        struct reg_default *reg_defaults;
        const void *reg_defaults_raw;
        void *cache;
        /* if set, the cache contains newer data than the HW */
        bool cache_dirty;
        /* if set, the HW registers are known to match map->reg_defaults */
        bool no_sync_defaults;

        struct reg_sequence *patch;
        int patch_regs;

        /* if set, converts bulk read to single read */
        bool use_single_read;
        /* if set, converts bulk read to single read */
        bool use_single_write;
        /* if set, the device supports multi write mode */
        bool can_multi_write;

        /* if set, raw reads/writes are limited to this size */
        size_t max_raw_read;
        size_t max_raw_write;

        struct rb_root range_tree;
        void *selector_work_buf;        /* Scratch buffer used for selector */
};

struct regcache_ops {
        const char *name;
        enum regcache_type type;
        int (*init)(struct regmap *map);
        int (*exit)(struct regmap *map);
#ifdef CONFIG_DEBUG_FS
        void (*debugfs_init)(struct regmap *map);
#endif
        int (*read)(struct regmap *map, unsigned int reg, unsigned int *value);
        int (*write)(struct regmap *map, unsigned int reg, unsigned int value);
        int (*sync)(struct regmap *map, unsigned int min, unsigned int max);
        int (*drop)(struct regmap *map, unsigned int min, unsigned int max);
};

bool regmap_writeable(struct regmap *map, unsigned int reg);
bool regmap_readable(struct regmap *map, unsigned int reg);
bool regmap_volatile(struct regmap *map, unsigned int reg);
bool regmap_precious(struct regmap *map, unsigned int reg);

int _regmap_write(struct regmap *map, unsigned int reg,
                  unsigned int val);

struct regmap_range_node {
        struct rb_node node;
        const char *name;
        struct regmap *map;

        unsigned int range_min;
        unsigned int range_max;

        unsigned int selector_reg;
        unsigned int selector_mask;
        int selector_shift;

        unsigned int window_start;
        unsigned int window_len;
};

struct regmap_field {
        struct regmap *regmap;
        unsigned int mask;
        /* lsb */
        unsigned int shift;
        unsigned int reg;

        unsigned int id_size;
        unsigned int id_offset;
};

#ifdef CONFIG_DEBUG_FS
extern void regmap_debugfs_initcall(void);
extern void regmap_debugfs_init(struct regmap *map, const char *name);
extern void regmap_debugfs_exit(struct regmap *map);
#else
static inline void regmap_debugfs_initcall(void) { }
static inline void regmap_debugfs_init(struct regmap *map, const char *name) { }
static inline void regmap_debugfs_exit(struct regmap *map) { }
#endif

/* regcache core declarations */
int regcache_init(struct regmap *map, const struct regmap_config *config);
void regcache_exit(struct regmap *map);
int regcache_read(struct regmap *map,
                       unsigned int reg, unsigned int *value);
int regcache_write(struct regmap *map,
                        unsigned int reg, unsigned int value);
int regcache_sync(struct regmap *map);
int regcache_sync_block(struct regmap *map, void *block,
                        unsigned long *cache_present,
                        unsigned int block_base, unsigned int start,
                        unsigned int end);

static inline const void *regcache_get_val_addr(struct regmap *map,
                                                const void *base,
                                                unsigned int idx)
{
        return base + (map->cache_word_size * idx);
}

unsigned int regcache_get_val(struct regmap *map, const void *base,
                              unsigned int idx);
bool regcache_set_val(struct regmap *map, void *base, unsigned int idx,
                      unsigned int val);
int regcache_lookup_reg(struct regmap *map, unsigned int reg);

int _regmap_raw_write(struct regmap *map, unsigned int reg,
                      const void *val, size_t val_len);

void regmap_async_complete_cb(struct regmap_async *async, int ret);

enum regmap_endian regmap_get_val_endian(struct device *dev,
                                         const struct regmap_bus *bus,
                                         const struct regmap_config *config);

extern struct regcache_ops regcache_rbtree_ops;
extern struct regcache_ops regcache_lzo_ops;
extern struct regcache_ops regcache_flat_ops;

static inline const char *regmap_name(const struct regmap *map)
{
        if (map->dev)
                return dev_name(map->dev);

        return map->name;
}

static inline unsigned int regmap_get_offset(const struct regmap *map,
                                             unsigned int index)
{
        if (map->reg_stride_order >= 0)
                return index << map->reg_stride_order;
        else
                return index * map->reg_stride;
}

static inline unsigned int regcache_get_index_by_order(const struct regmap *map,
                                                       unsigned int reg)
{
        return reg >> map->reg_stride_order;
}

#endif