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u-boot/include/i2c.h
Hannes Petermaier d5243359e1 OMAP24xx I2C: Add support for set-speed 
Adds support for set-speed on the OMAP24xx I2C Adapter.

Changes to omap24_i2c_write(...) for polling ARDY Bit from IRQ-Status.
Otherwise on a subsequent call the transfer of last byte from the
predecessor is aborted and therefore lost. For exmaple when
i2c_write(...) is followed by a i2c_setspeed(...) (which has to
deactivate and activate master for changing psc,...).

Minor cosmetical changes.

Signed-off-by: Hannes Petermaier <oe5hpm@oevsv.at>
Cc: Heiko Schocher <hs@denx.de>
2014-02-20 06:48:23 +01:00

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/*
* 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 waitdelay;
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\n", __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\n",
__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_ */
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