upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
253 lines
6.5 KiB
253 lines
6.5 KiB
/*
|
|
* (C) Copyright 2001
|
|
* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*
|
|
* 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 */
|
|
|
|
#ifdef CONFIG_I2C_MULTI_BUS
|
|
#define MAX_I2C_BUS 2
|
|
#define I2C_MULTI_BUS 1
|
|
#else
|
|
#define MAX_I2C_BUS 1
|
|
#define I2C_MULTI_BUS 0
|
|
#endif
|
|
|
|
#if !defined(CONFIG_SYS_MAX_I2C_BUS)
|
|
#define CONFIG_SYS_MAX_I2C_BUS MAX_I2C_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
|
|
|
|
#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)) && !defined(CONFIG_AT91_LEGACY)
|
|
# 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
|
|
|
|
#if defined(CONFIG_I2C_MUX)
|
|
|
|
typedef struct _mux {
|
|
uchar chip;
|
|
uchar channel;
|
|
char *name;
|
|
struct _mux *next;
|
|
} I2C_MUX;
|
|
|
|
typedef struct _mux_device {
|
|
int busid;
|
|
I2C_MUX *mux; /* List of muxes, to reach the device */
|
|
struct _mux_device *next;
|
|
} I2C_MUX_DEVICE;
|
|
|
|
I2C_MUX_DEVICE *i2c_mux_search_device(int id);
|
|
I2C_MUX_DEVICE *i2c_mux_ident_muxstring (uchar *buf);
|
|
int i2x_mux_select_mux(int bus);
|
|
int i2c_mux_ident_muxstring_f (uchar *buf);
|
|
#endif
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/* 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);
|
|
}
|
|
|
|
#endif /* _I2C_H_ */
|
|
|