/*
 * Copyright (c) 2013 Samsung Electronics Co., Ltd.
 * Copyright (c) 2013 Linaro Ltd.
 * Author: Thomas Abraham <thomas.ab@samsung.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.
 *
 * Common Clock Framework support for all Samsung platforms
*/

#ifndef __SAMSUNG_CLK_H
#define __SAMSUNG_CLK_H

#include <linux/clk-provider.h>
#include "clk-pll.h"

struct clk;

/**
 * struct samsung_clk_provider: information about clock provider
 * @reg_base: virtual address for the register base.
 * @clk_data: holds clock related data like clk* and number of clocks.
 * @lock: maintains exclusion between callbacks for a given clock-provider.
 */
struct samsung_clk_provider {
        void __iomem *reg_base;
        struct clk_onecell_data clk_data;
        spinlock_t lock;
};

/**
 * struct samsung_clock_alias: information about mux clock
 * @id: platform specific id of the clock.
 * @dev_name: name of the device to which this clock belongs.
 * @alias: optional clock alias name to be assigned to this clock.
 */
struct samsung_clock_alias {
        unsigned int            id;
        const char              *dev_name;
        const char              *alias;
};

#define ALIAS(_id, dname, a)    \
        {                                                       \
                .id             = _id,                          \
                .dev_name       = dname,                        \
                .alias          = a,                            \
        }

#define MHZ (1000 * 1000)

/**
 * struct samsung_fixed_rate_clock: information about fixed-rate clock
 * @id: platform specific id of the clock.
 * @name: name of this fixed-rate clock.
 * @parent_name: optional parent clock name.
 * @flags: optional fixed-rate clock flags.
 * @fixed-rate: fixed clock rate of this clock.
 */
struct samsung_fixed_rate_clock {
        unsigned int            id;
        char                    *name;
        const char              *parent_name;
        unsigned long           flags;
        unsigned long           fixed_rate;
};

#define FRATE(_id, cname, pname, f, frate)              \
        {                                               \
                .id             = _id,                  \
                .name           = cname,                \
                .parent_name    = pname,                \
                .flags          = f,                    \
                .fixed_rate     = frate,                \
        }

/*
 * struct samsung_fixed_factor_clock: information about fixed-factor clock
 * @id: platform specific id of the clock.
 * @name: name of this fixed-factor clock.
 * @parent_name: parent clock name.
 * @mult: fixed multiplication factor.
 * @div: fixed division factor.
 * @flags: optional fixed-factor clock flags.
 */
struct samsung_fixed_factor_clock {
        unsigned int            id;
        char                    *name;
        const char              *parent_name;
        unsigned long           mult;
        unsigned long           div;
        unsigned long           flags;
};

#define FFACTOR(_id, cname, pname, m, d, f)             \
        {                                               \
                .id             = _id,                  \
                .name           = cname,                \
                .parent_name    = pname,                \
                .mult           = m,                    \
                .div            = d,                    \
                .flags          = f,                    \
        }

/**
 * struct samsung_mux_clock: information about mux clock
 * @id: platform specific id of the clock.
 * @dev_name: name of the device to which this clock belongs.
 * @name: name of this mux clock.
 * @parent_names: array of pointer to parent clock names.
 * @num_parents: number of parents listed in @parent_names.
 * @flags: optional flags for basic clock.
 * @offset: offset of the register for configuring the mux.
 * @shift: starting bit location of the mux control bit-field in @reg.
 * @width: width of the mux control bit-field in @reg.
 * @mux_flags: flags for mux-type clock.
 * @alias: optional clock alias name to be assigned to this clock.
 */
struct samsung_mux_clock {
        unsigned int            id;
        const char              *dev_name;
        const char              *name;
        const char              *const *parent_names;
        u8                      num_parents;
        unsigned long           flags;
        unsigned long           offset;
        u8                      shift;
        u8                      width;
        u8                      mux_flags;
        const char              *alias;
};

#define __MUX(_id, dname, cname, pnames, o, s, w, f, mf, a)     \
        {                                                       \
                .id             = _id,                          \
                .dev_name       = dname,                        \
                .name           = cname,                        \
                .parent_names   = pnames,                       \
                .num_parents    = ARRAY_SIZE(pnames),           \
                .flags          = (f) | CLK_SET_RATE_NO_REPARENT, \
                .offset         = o,                            \
                .shift          = s,                            \
                .width          = w,                            \
                .mux_flags      = mf,                           \
                .alias          = a,                            \
        }

#define MUX(_id, cname, pnames, o, s, w)                        \
        __MUX(_id, NULL, cname, pnames, o, s, w, 0, 0, NULL)

#define MUX_A(_id, cname, pnames, o, s, w, a)                   \
        __MUX(_id, NULL, cname, pnames, o, s, w, 0, 0, a)

#define MUX_F(_id, cname, pnames, o, s, w, f, mf)               \
        __MUX(_id, NULL, cname, pnames, o, s, w, f, mf, NULL)

#define MUX_FA(_id, cname, pnames, o, s, w, f, mf, a)           \
        __MUX(_id, NULL, cname, pnames, o, s, w, f, mf, a)

/**
 * @id: platform specific id of the clock.
 * struct samsung_div_clock: information about div clock
 * @dev_name: name of the device to which this clock belongs.
 * @name: name of this div clock.
 * @parent_name: name of the parent clock.
 * @flags: optional flags for basic clock.
 * @offset: offset of the register for configuring the div.
 * @shift: starting bit location of the div control bit-field in @reg.
 * @div_flags: flags for div-type clock.
 * @alias: optional clock alias name to be assigned to this clock.
 */
struct samsung_div_clock {
        unsigned int            id;
        const char              *dev_name;
        const char              *name;
        const char              *parent_name;
        unsigned long           flags;
        unsigned long           offset;
        u8                      shift;
        u8                      width;
        u8                      div_flags;
        const char              *alias;
        struct clk_div_table    *table;
};

#define __DIV(_id, dname, cname, pname, o, s, w, f, df, a, t)   \
        {                                                       \
                .id             = _id,                          \
                .dev_name       = dname,                        \
                .name           = cname,                        \
                .parent_name    = pname,                        \
                .flags          = f,                            \
                .offset         = o,                            \
                .shift          = s,                            \
                .width          = w,                            \
                .div_flags      = df,                           \
                .alias          = a,                            \
                .table          = t,                            \
        }

#define DIV(_id, cname, pname, o, s, w)                         \
        __DIV(_id, NULL, cname, pname, o, s, w, 0, 0, NULL, NULL)

#define DIV_A(_id, cname, pname, o, s, w, a)                    \
        __DIV(_id, NULL, cname, pname, o, s, w, 0, 0, a, NULL)

#define DIV_F(_id, cname, pname, o, s, w, f, df)                \
        __DIV(_id, NULL, cname, pname, o, s, w, f, df, NULL, NULL)

#define DIV_T(_id, cname, pname, o, s, w, t)                    \
        __DIV(_id, NULL, cname, pname, o, s, w, 0, 0, NULL, t)

/**
 * struct samsung_gate_clock: information about gate clock
 * @id: platform specific id of the clock.
 * @dev_name: name of the device to which this clock belongs.
 * @name: name of this gate clock.
 * @parent_name: name of the parent clock.
 * @flags: optional flags for basic clock.
 * @offset: offset of the register for configuring the gate.
 * @bit_idx: bit index of the gate control bit-field in @reg.
 * @gate_flags: flags for gate-type clock.
 * @alias: optional clock alias name to be assigned to this clock.
 */
struct samsung_gate_clock {
        unsigned int            id;
        const char              *dev_name;
        const char              *name;
        const char              *parent_name;
        unsigned long           flags;
        unsigned long           offset;
        u8                      bit_idx;
        u8                      gate_flags;
        const char              *alias;
};

#define __GATE(_id, dname, cname, pname, o, b, f, gf, a)        \
        {                                                       \
                .id             = _id,                          \
                .dev_name       = dname,                        \
                .name           = cname,                        \
                .parent_name    = pname,                        \
                .flags          = f,                            \
                .offset         = o,                            \
                .bit_idx        = b,                            \
                .gate_flags     = gf,                           \
                .alias          = a,                            \
        }

#define GATE(_id, cname, pname, o, b, f, gf)                    \
        __GATE(_id, NULL, cname, pname, o, b, f, gf, NULL)

#define GATE_A(_id, cname, pname, o, b, f, gf, a)               \
        __GATE(_id, NULL, cname, pname, o, b, f, gf, a)

#define GATE_D(_id, dname, cname, pname, o, b, f, gf)           \
        __GATE(_id, dname, cname, pname, o, b, f, gf, NULL)

#define GATE_DA(_id, dname, cname, pname, o, b, f, gf, a)       \
        __GATE(_id, dname, cname, pname, o, b, f, gf, a)

#define PNAME(x) static const char *x[] __initdata

/**
 * struct samsung_clk_reg_dump: register dump of clock controller registers.
 * @offset: clock register offset from the controller base address.
 * @value: the value to be register at offset.
 */
struct samsung_clk_reg_dump {
        u32     offset;
        u32     value;
};

/**
 * struct samsung_pll_clock: information about pll clock
 * @id: platform specific id of the clock.
 * @dev_name: name of the device to which this clock belongs.
 * @name: name of this pll clock.
 * @parent_name: name of the parent clock.
 * @flags: optional flags for basic clock.
 * @con_offset: offset of the register for configuring the PLL.
 * @lock_offset: offset of the register for locking the PLL.
 * @type: Type of PLL to be registered.
 * @alias: optional clock alias name to be assigned to this clock.
 */
struct samsung_pll_clock {
        unsigned int            id;
        const char              *dev_name;
        const char              *name;
        const char              *parent_name;
        unsigned long           flags;
        int                     con_offset;
        int                     lock_offset;
        enum samsung_pll_type   type;
        const struct samsung_pll_rate_table *rate_table;
        const char              *alias;
};

#define __PLL(_typ, _id, _dname, _name, _pname, _flags, _lock, _con,    \
                _rtable, _alias)                                        \
        {                                                               \
                .id             = _id,                                  \
                .type           = _typ,                                 \
                .dev_name       = _dname,                               \
                .name           = _name,                                \
                .parent_name    = _pname,                               \
                .flags          = CLK_GET_RATE_NOCACHE,                 \
                .con_offset     = _con,                                 \
                .lock_offset    = _lock,                                \
                .rate_table     = _rtable,                              \
                .alias          = _alias,                               \
        }

#define PLL(_typ, _id, _name, _pname, _lock, _con, _rtable)     \
        __PLL(_typ, _id, NULL, _name, _pname, CLK_GET_RATE_NOCACHE,     \
                _lock, _con, _rtable, _name)

#define PLL_A(_typ, _id, _name, _pname, _lock, _con, _alias, _rtable) \
        __PLL(_typ, _id, NULL, _name, _pname, CLK_GET_RATE_NOCACHE,     \
                _lock, _con, _rtable, _alias)

struct samsung_clock_reg_cache {
        struct list_head node;
        void __iomem *reg_base;
        struct samsung_clk_reg_dump *rdump;
        unsigned int rd_num;
};

struct samsung_cmu_info {
        /* list of pll clocks and respective count */
        struct samsung_pll_clock *pll_clks;
        unsigned int nr_pll_clks;
        /* list of mux clocks and respective count */
        struct samsung_mux_clock *mux_clks;
        unsigned int nr_mux_clks;
        /* list of div clocks and respective count */
        struct samsung_div_clock *div_clks;
        unsigned int nr_div_clks;
        /* list of gate clocks and respective count */
        struct samsung_gate_clock *gate_clks;
        unsigned int nr_gate_clks;
        /* list of fixed clocks and respective count */
        struct samsung_fixed_rate_clock *fixed_clks;
        unsigned int nr_fixed_clks;
        /* list of fixed factor clocks and respective count */
        struct samsung_fixed_factor_clock *fixed_factor_clks;
        unsigned int nr_fixed_factor_clks;
        /* total number of clocks with IDs assigned*/
        unsigned int nr_clk_ids;

        /* list and number of clocks registers */
        unsigned long *clk_regs;
        unsigned int nr_clk_regs;
};

extern struct samsung_clk_provider *__init samsung_clk_init(
                        struct device_node *np, void __iomem *base,
                        unsigned long nr_clks);
extern void __init samsung_clk_of_add_provider(struct device_node *np,
                        struct samsung_clk_provider *ctx);
extern void __init samsung_clk_of_register_fixed_ext(
                        struct samsung_clk_provider *ctx,
                        struct samsung_fixed_rate_clock *fixed_rate_clk,
                        unsigned int nr_fixed_rate_clk,
                        const struct of_device_id *clk_matches);

extern void samsung_clk_add_lookup(struct samsung_clk_provider *ctx,
                        struct clk *clk, unsigned int id);

extern void __init samsung_clk_register_alias(struct samsung_clk_provider *ctx,
                        const struct samsung_clock_alias *list,
                        unsigned int nr_clk);
extern void __init samsung_clk_register_fixed_rate(
                        struct samsung_clk_provider *ctx,
                        const struct samsung_fixed_rate_clock *clk_list,
                        unsigned int nr_clk);
extern void __init samsung_clk_register_fixed_factor(
                        struct samsung_clk_provider *ctx,
                        const struct samsung_fixed_factor_clock *list,
                        unsigned int nr_clk);
extern void __init samsung_clk_register_mux(struct samsung_clk_provider *ctx,
                        const struct samsung_mux_clock *clk_list,
                        unsigned int nr_clk);
extern void __init samsung_clk_register_div(struct samsung_clk_provider *ctx,
                        const struct samsung_div_clock *clk_list,
                        unsigned int nr_clk);
extern void __init samsung_clk_register_gate(struct samsung_clk_provider *ctx,
                        const struct samsung_gate_clock *clk_list,
                        unsigned int nr_clk);
extern void __init samsung_clk_register_pll(struct samsung_clk_provider *ctx,
                        const struct samsung_pll_clock *pll_list,
                        unsigned int nr_clk, void __iomem *base);

extern struct samsung_clk_provider __init *samsung_cmu_register_one(
                        struct device_node *,
                        struct samsung_cmu_info *);

extern unsigned long _get_rate(const char *clk_name);

extern void samsung_clk_save(void __iomem *base,
                        struct samsung_clk_reg_dump *rd,
                        unsigned int num_regs);
extern void samsung_clk_restore(void __iomem *base,
                        const struct samsung_clk_reg_dump *rd,
                        unsigned int num_regs);
extern struct samsung_clk_reg_dump *samsung_clk_alloc_reg_dump(
                        const unsigned long *rdump,
                        unsigned long nr_rdump);

#endif /* __SAMSUNG_CLK_H */