/*

   * Copyright (C) 2009 Sergey Kubushyn <ksi@koi8.net>
   * Copyright (C) 2009 - 2013 Heiko Schocher <hs@denx.de>
   * Changes for multibus/multiadapter I2C support.
   *

   * (C) Copyright 2001
   * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
   *

   * SPDX-License-Identifier:	GPL-2.0+

   *
   * The original I2C interface was
   *   (C) 2000 by Paolo Scaffardi (arsenio@tin.it)
   *   AIRVENT SAM s.p.a - RIMINI(ITALY)
   * but has been changed substantially.
   */
  
  #ifndef _I2C_H_
  #define _I2C_H_
  
  /*
   * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
   *
   * The implementation MUST NOT use static or global variables if the
   * I2C routines are used to read SDRAM configuration information
   * because this is done before the memories are initialized. Limited
   * use of stack-based variables are OK (the initial stack size is
   * limited).
   *
   * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
   */
  
  /*
   * Configuration items.
   */
  #define I2C_RXTX_LEN	128	/* maximum tx/rx buffer length */

  #if !defined(CONFIG_SYS_I2C_MAX_HOPS)
  /* no muxes used bus = i2c adapters */
  #define CONFIG_SYS_I2C_DIRECT_BUS	1
  #define CONFIG_SYS_I2C_MAX_HOPS		0
  #define CONFIG_SYS_NUM_I2C_BUSES	ll_entry_count(struct i2c_adapter, i2c)

  #else

  /* we use i2c muxes */
  #undef CONFIG_SYS_I2C_DIRECT_BUS

  #endif

  /* define the I2C bus number for RTC and DTT if not already done */

  #if !defined(CONFIG_SYS_RTC_BUS_NUM)
  #define CONFIG_SYS_RTC_BUS_NUM		0

  #endif

  #if !defined(CONFIG_SYS_DTT_BUS_NUM)
  #define CONFIG_SYS_DTT_BUS_NUM		0

  #endif

  #if !defined(CONFIG_SYS_SPD_BUS_NUM)
  #define CONFIG_SYS_SPD_BUS_NUM		0

  #endif

  struct i2c_adapter {
  	void		(*init)(struct i2c_adapter *adap, int speed,
  				int slaveaddr);
  	int		(*probe)(struct i2c_adapter *adap, uint8_t chip);
  	int		(*read)(struct i2c_adapter *adap, uint8_t chip,
  				uint addr, int alen, uint8_t *buffer,
  				int len);
  	int		(*write)(struct i2c_adapter *adap, uint8_t chip,
  				uint addr, int alen, uint8_t *buffer,
  				int len);
  	uint		(*set_bus_speed)(struct i2c_adapter *adap,
  				uint speed);
  	int		speed;
  	int		slaveaddr;
  	int		init_done;
  	int		hwadapnr;
  	char		*name;
  };
  
  #define U_BOOT_I2C_MKENT_COMPLETE(_init, _probe, _read, _write, \
  		_set_speed, _speed, _slaveaddr, _hwadapnr, _name) \
  	{ \
  		.init		=	_init, \
  		.probe		=	_probe, \
  		.read		=	_read, \
  		.write		=	_write, \
  		.set_bus_speed	=	_set_speed, \
  		.speed		=	_speed, \
  		.slaveaddr	=	_slaveaddr, \
  		.init_done	=	0, \
  		.hwadapnr	=	_hwadapnr, \
  		.name		=	#_name \
  };
  
  #define U_BOOT_I2C_ADAP_COMPLETE(_name, _init, _probe, _read, _write, \
  			_set_speed, _speed, _slaveaddr, _hwadapnr) \
  	ll_entry_declare(struct i2c_adapter, _name, i2c) = \
  	U_BOOT_I2C_MKENT_COMPLETE(_init, _probe, _read, _write, \
  		 _set_speed, _speed, _slaveaddr, _hwadapnr, _name);
  
  struct i2c_adapter *i2c_get_adapter(int index);
  
  #ifndef CONFIG_SYS_I2C_DIRECT_BUS
  struct i2c_mux {
  	int	id;
  	char	name[16];
  };
  
  struct i2c_next_hop {
  	struct i2c_mux		mux;
  	uint8_t		chip;
  	uint8_t		channel;
  };
  
  struct i2c_bus_hose {
  	int	adapter;
  	struct i2c_next_hop	next_hop[CONFIG_SYS_I2C_MAX_HOPS];
  };
  #define I2C_NULL_HOP	{{-1, ""}, 0, 0}
  extern struct i2c_bus_hose	i2c_bus[];
  
  #define I2C_ADAPTER(bus)	i2c_bus[bus].adapter
  #else
  #define I2C_ADAPTER(bus)	bus
  #endif
  #define	I2C_BUS			gd->cur_i2c_bus
  
  #define	I2C_ADAP_NR(bus)	i2c_get_adapter(I2C_ADAPTER(bus))
  #define	I2C_ADAP		I2C_ADAP_NR(gd->cur_i2c_bus)
  #define I2C_ADAP_HWNR		(I2C_ADAP->hwadapnr)
  
  #ifndef CONFIG_SYS_I2C_DIRECT_BUS
  #define I2C_MUX_PCA9540_ID	1
  #define I2C_MUX_PCA9540		{I2C_MUX_PCA9540_ID, "PCA9540B"}
  #define I2C_MUX_PCA9542_ID	2
  #define I2C_MUX_PCA9542		{I2C_MUX_PCA9542_ID, "PCA9542A"}
  #define I2C_MUX_PCA9544_ID	3
  #define I2C_MUX_PCA9544		{I2C_MUX_PCA9544_ID, "PCA9544A"}
  #define I2C_MUX_PCA9547_ID	4
  #define I2C_MUX_PCA9547		{I2C_MUX_PCA9547_ID, "PCA9547A"}

  #define I2C_MUX_PCA9548_ID	5
  #define I2C_MUX_PCA9548		{I2C_MUX_PCA9548_ID, "PCA9548"}

  #endif

  #ifndef I2C_SOFT_DECLARATIONS
  # if defined(CONFIG_MPC8260)

  #  define I2C_SOFT_DECLARATIONS volatile ioport_t *iop = ioport_addr((immap_t *)CONFIG_SYS_IMMR, I2C_PORT);

  # elif defined(CONFIG_8xx)

  #  define I2C_SOFT_DECLARATIONS	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;

  
  # elif (defined(CONFIG_AT91RM9200) || \
  	defined(CONFIG_AT91SAM9260) ||  defined(CONFIG_AT91SAM9261) || \

  	defined(CONFIG_AT91SAM9263))

  #  define I2C_SOFT_DECLARATIONS	at91_pio_t *pio	= (at91_pio_t *) ATMEL_BASE_PIOA;

  # else
  #  define I2C_SOFT_DECLARATIONS
  # endif
  #endif

  
  #ifdef CONFIG_8xx

  /* Set default value for the I2C bus speed on 8xx. In the

   * future, we'll define these in all 8xx board config files.
   */
  #ifndef	CONFIG_SYS_I2C_SPEED
  #define	CONFIG_SYS_I2C_SPEED	50000
  #endif

  #endif

  /*
   * Many boards/controllers/drivers don't support an I2C slave interface so
   * provide a default slave address for them for use in common code.  A real
   * value for CONFIG_SYS_I2C_SLAVE should be defined for any board which does
   * support a slave interface.
   */

  #ifndef	CONFIG_SYS_I2C_SLAVE

  #define	CONFIG_SYS_I2C_SLAVE	0xfe

  #endif

  /*
   * Initialization, must be called once on start up, may be called
   * repeatedly to change the speed and slave addresses.
   */
  void i2c_init(int speed, int slaveaddr);

  void i2c_init_board(void);

  #ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT
  void i2c_board_late_init(void);
  #endif

  #ifdef CONFIG_SYS_I2C
  /*

   * i2c_get_bus_num:
   *
   *  Returns index of currently active I2C bus.  Zero-based.
   */
  unsigned int i2c_get_bus_num(void);
  
  /*
   * i2c_set_bus_num:
   *
   *  Change the active I2C bus.  Subsequent read/write calls will
   *  go to this one.
   *
   *	bus - bus index, zero based
   *
   *	Returns: 0 on success, not 0 on failure
   *
   */
  int i2c_set_bus_num(unsigned int bus);
  
  /*
   * i2c_init_all():
   *
   * Initializes all I2C adapters in the system. All i2c_adap structures must
   * be initialized beforehead with function pointers and data, including
   * speed and slaveaddr. Returns 0 on success, non-0 on failure.
   */
  void i2c_init_all(void);
  
  /*
   * Probe the given I2C chip address.  Returns 0 if a chip responded,
   * not 0 on failure.
   */
  int i2c_probe(uint8_t chip);
  
  /*
   * Read/Write interface:
   *   chip:    I2C chip address, range 0..127
   *   addr:    Memory (register) address within the chip
   *   alen:    Number of bytes to use for addr (typically 1, 2 for larger
   *              memories, 0 for register type devices with only one
   *              register)
   *   buffer:  Where to read/write the data
   *   len:     How many bytes to read/write
   *
   *   Returns: 0 on success, not 0 on failure
   */
  int i2c_read(uint8_t chip, unsigned int addr, int alen,
  				uint8_t *buffer, int len);
  
  int i2c_write(uint8_t chip, unsigned int addr, int alen,
  				uint8_t *buffer, int len);
  
  /*
   * Utility routines to read/write registers.
   */
  uint8_t i2c_reg_read(uint8_t addr, uint8_t reg);
  
  void i2c_reg_write(uint8_t addr, uint8_t reg, uint8_t val);
  
  /*
   * i2c_set_bus_speed:
   *
   *  Change the speed of the active I2C bus
   *
   *	speed - bus speed in Hz
   *
   *	Returns: new bus speed
   *
   */
  unsigned int i2c_set_bus_speed(unsigned int speed);

  /*
   * i2c_get_bus_speed:
   *
   *  Returns speed of currently active I2C bus in Hz
   */

  unsigned int i2c_get_bus_speed(void);

  /*
   * i2c_reloc_fixup:
   *
   * Adjusts I2C pointers after U-Boot is relocated to DRAM
   */
  void i2c_reloc_fixup(void);

  #if defined(CONFIG_SYS_I2C_SOFT)
  void i2c_soft_init(void);
  void i2c_soft_active(void);
  void i2c_soft_tristate(void);
  int i2c_soft_read(void);
  void i2c_soft_sda(int bit);
  void i2c_soft_scl(int bit);
  void i2c_soft_delay(void);

  #endif

  #else

  /*
   * Probe the given I2C chip address.  Returns 0 if a chip responded,
   * not 0 on failure.
   */
  int i2c_probe(uchar chip);
  
  /*
   * Read/Write interface:
   *   chip:    I2C chip address, range 0..127
   *   addr:    Memory (register) address within the chip
   *   alen:    Number of bytes to use for addr (typically 1, 2 for larger
   *              memories, 0 for register type devices with only one
   *              register)
   *   buffer:  Where to read/write the data
   *   len:     How many bytes to read/write
   *
   *   Returns: 0 on success, not 0 on failure
   */
  int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len);
  int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len);
  
  /*
   * Utility routines to read/write registers.
   */

  static inline u8 i2c_reg_read(u8 addr, u8 reg)
  {
  	u8 buf;
  
  #ifdef CONFIG_8xx
  	/* MPC8xx needs this.  Maybe one day we can get rid of it. */
  	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
  #endif
  
  #ifdef DEBUG
  	printf("%s: addr=0x%02x, reg=0x%02x
  ", __func__, addr, reg);
  #endif

  	i2c_read(addr, reg, 1, &buf, 1);

  
  	return buf;
  }
  
  static inline void i2c_reg_write(u8 addr, u8 reg, u8 val)
  {
  #ifdef CONFIG_8xx
  	/* MPC8xx needs this.  Maybe one day we can get rid of it. */
  	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
  #endif
  
  #ifdef DEBUG
  	printf("%s: addr=0x%02x, reg=0x%02x, val=0x%02x
  ",
  	       __func__, addr, reg, val);
  #endif

  	i2c_write(addr, reg, 1, &val, 1);

  }

  /*
   * Functions for setting the current I2C bus and its speed
   */
  
  /*
   * i2c_set_bus_num:
   *
   *  Change the active I2C bus.  Subsequent read/write calls will
   *  go to this one.
   *

   *	bus - bus index, zero based

   *

   *	Returns: 0 on success, not 0 on failure

   *
   */

  int i2c_set_bus_num(unsigned int bus);

  
  /*
   * i2c_get_bus_num:
   *
   *  Returns index of currently active I2C bus.  Zero-based.
   */

  unsigned int i2c_get_bus_num(void);

  
  /*
   * i2c_set_bus_speed:
   *
   *  Change the speed of the active I2C bus
   *

   *	speed - bus speed in Hz

   *

   *	Returns: 0 on success, not 0 on failure

   *
   */

  int i2c_set_bus_speed(unsigned int);

  
  /*
   * i2c_get_bus_speed:
   *
   *  Returns speed of currently active I2C bus in Hz
   */

  unsigned int i2c_get_bus_speed(void);

  #endif /* CONFIG_SYS_I2C */
  
  /*
   * only for backwardcompatibility, should go away if we switched
   * completely to new multibus support.
   */
  #if defined(CONFIG_SYS_I2C) || defined(CONFIG_I2C_MULTI_BUS)
  # if !defined(CONFIG_SYS_MAX_I2C_BUS)
  #  define CONFIG_SYS_MAX_I2C_BUS		2
  # endif

  # define I2C_MULTI_BUS				1

  #else
  # define CONFIG_SYS_MAX_I2C_BUS		1
  # define I2C_MULTI_BUS				0
  #endif

  /* NOTE: These two functions MUST be always_inline to avoid code growth! */
  static inline unsigned int I2C_GET_BUS(void) __attribute__((always_inline));
  static inline unsigned int I2C_GET_BUS(void)
  {
  	return I2C_MULTI_BUS ? i2c_get_bus_num() : 0;
  }
  
  static inline void I2C_SET_BUS(unsigned int bus) __attribute__((always_inline));
  static inline void I2C_SET_BUS(unsigned int bus)
  {
  	if (I2C_MULTI_BUS)
  		i2c_set_bus_num(bus);
  }

  /* Multi I2C definitions */
  enum {
  	I2C_0, I2C_1, I2C_2, I2C_3, I2C_4, I2C_5, I2C_6, I2C_7,
  	I2C_8, I2C_9, I2C_10,
  };
  
  /* Multi I2C busses handling */
  #ifdef CONFIG_SOFT_I2C_MULTI_BUS
  extern int get_multi_scl_pin(void);
  extern int get_multi_sda_pin(void);
  extern int multi_i2c_init(void);
  #endif

  
  /**
   * Get FDT values for i2c bus.
   *
   * @param blob  Device tree blbo
   * @return the number of I2C bus
   */
  void board_i2c_init(const void *blob);
  
  /**
   * Find the I2C bus number by given a FDT I2C node.
   *
   * @param blob  Device tree blbo
   * @param node  FDT I2C node to find
   * @return the number of I2C bus (zero based), or -1 on error
   */
  int i2c_get_bus_num_fdt(int node);
  
  /**
   * Reset the I2C bus represented by the given a FDT I2C node.
   *
   * @param blob  Device tree blbo
   * @param node  FDT I2C node to find
   * @return 0 if port was reset, -1 if not found
   */
  int i2c_reset_port_fdt(const void *blob, int node);

  #endif	/* _I2C_H_ */