mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 23:47:24 +00:00
f092f15d39
This reverts commit 60ce53cf9f.
The commit causes build breakage for a number of boards. This results
from the fact that now the arguments of debug() actually get
referenced (even if there is hope that the compiler will optimize
away the debug() call). The obvious fix to that probem (change the
code to always declare the referenced variables and data structures)
increases the code size, and was this rejected. So it was decided to
revert this commit until a better solution is found.
239 lines
6.1 KiB
C
239 lines
6.1 KiB
C
/*
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* (C) Copyright 2001
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* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* The original I2C interface was
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* (C) 2000 by Paolo Scaffardi (arsenio@tin.it)
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* AIRVENT SAM s.p.a - RIMINI(ITALY)
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* but has been changed substantially.
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*/
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#ifndef _I2C_H_
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#define _I2C_H_
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/*
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* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
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*
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* The implementation MUST NOT use static or global variables if the
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* I2C routines are used to read SDRAM configuration information
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* because this is done before the memories are initialized. Limited
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* use of stack-based variables are OK (the initial stack size is
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* limited).
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*
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* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
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*/
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/*
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* Configuration items.
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*/
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#define I2C_RXTX_LEN 128 /* maximum tx/rx buffer length */
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#if defined(CONFIG_I2C_MULTI_BUS)
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#if !defined(CONFIG_SYS_MAX_I2C_BUS)
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#define CONFIG_SYS_MAX_I2C_BUS 2
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#endif
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#define I2C_GET_BUS() i2c_get_bus_num()
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#define I2C_SET_BUS(a) i2c_set_bus_num(a)
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#else
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#define CONFIG_SYS_MAX_I2C_BUS 1
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#define I2C_GET_BUS() 0
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#define I2C_SET_BUS(a)
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#endif
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/* define the I2C bus number for RTC and DTT if not already done */
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#if !defined(CONFIG_SYS_RTC_BUS_NUM)
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#define CONFIG_SYS_RTC_BUS_NUM 0
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#endif
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#if !defined(CONFIG_SYS_DTT_BUS_NUM)
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#define CONFIG_SYS_DTT_BUS_NUM 0
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#endif
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#if !defined(CONFIG_SYS_SPD_BUS_NUM)
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#define CONFIG_SYS_SPD_BUS_NUM 0
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#endif
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#ifndef I2C_SOFT_DECLARATIONS
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# if defined(CONFIG_MPC8260)
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# define I2C_SOFT_DECLARATIONS volatile ioport_t *iop = ioport_addr((immap_t *)CONFIG_SYS_IMMR, I2C_PORT);
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# elif defined(CONFIG_8xx)
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# define I2C_SOFT_DECLARATIONS volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
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# elif (defined(CONFIG_AT91RM9200) || \
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defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9261) || \
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defined(CONFIG_AT91SAM9263)) && !defined(CONFIG_AT91_LEGACY)
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# define I2C_SOFT_DECLARATIONS at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE;
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# else
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# define I2C_SOFT_DECLARATIONS
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# endif
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#endif
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#ifdef CONFIG_8xx
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/* Set default value for the I2C bus speed on 8xx. In the
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* future, we'll define these in all 8xx board config files.
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*/
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#ifndef CONFIG_SYS_I2C_SPEED
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#define CONFIG_SYS_I2C_SPEED 50000
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#endif
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#endif
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/*
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* Many boards/controllers/drivers don't support an I2C slave interface so
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* provide a default slave address for them for use in common code. A real
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* value for CONFIG_SYS_I2C_SLAVE should be defined for any board which does
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* support a slave interface.
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*/
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#ifndef CONFIG_SYS_I2C_SLAVE
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#define CONFIG_SYS_I2C_SLAVE 0xfe
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#endif
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/*
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* Initialization, must be called once on start up, may be called
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* repeatedly to change the speed and slave addresses.
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*/
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void i2c_init(int speed, int slaveaddr);
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void i2c_init_board(void);
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#ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT
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void i2c_board_late_init(void);
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#endif
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#if defined(CONFIG_I2C_MUX)
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typedef struct _mux {
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uchar chip;
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uchar channel;
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char *name;
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struct _mux *next;
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} I2C_MUX;
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typedef struct _mux_device {
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int busid;
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I2C_MUX *mux; /* List of muxes, to reach the device */
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struct _mux_device *next;
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} I2C_MUX_DEVICE;
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I2C_MUX_DEVICE *i2c_mux_search_device(int id);
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I2C_MUX_DEVICE *i2c_mux_ident_muxstring (uchar *buf);
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int i2x_mux_select_mux(int bus);
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int i2c_mux_ident_muxstring_f (uchar *buf);
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#endif
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/*
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* Probe the given I2C chip address. Returns 0 if a chip responded,
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* not 0 on failure.
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*/
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int i2c_probe(uchar chip);
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/*
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* Read/Write interface:
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* chip: I2C chip address, range 0..127
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* addr: Memory (register) address within the chip
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* alen: Number of bytes to use for addr (typically 1, 2 for larger
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* memories, 0 for register type devices with only one
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* register)
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* buffer: Where to read/write the data
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* len: How many bytes to read/write
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*
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* Returns: 0 on success, not 0 on failure
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*/
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int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len);
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int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len);
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/*
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* Utility routines to read/write registers.
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*/
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static inline u8 i2c_reg_read(u8 addr, u8 reg)
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{
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u8 buf;
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#ifdef CONFIG_8xx
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/* MPC8xx needs this. Maybe one day we can get rid of it. */
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i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
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#endif
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#ifdef DEBUG
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printf("%s: addr=0x%02x, reg=0x%02x\n", __func__, addr, reg);
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#endif
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i2c_read(addr, reg, 1, &buf, 1);
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return buf;
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}
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static inline void i2c_reg_write(u8 addr, u8 reg, u8 val)
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{
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#ifdef CONFIG_8xx
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/* MPC8xx needs this. Maybe one day we can get rid of it. */
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i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
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#endif
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#ifdef DEBUG
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printf("%s: addr=0x%02x, reg=0x%02x, val=0x%02x\n",
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__func__, addr, reg, val);
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#endif
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i2c_write(addr, reg, 1, &val, 1);
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}
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/*
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* Functions for setting the current I2C bus and its speed
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*/
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/*
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* i2c_set_bus_num:
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*
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* Change the active I2C bus. Subsequent read/write calls will
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* go to this one.
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*
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* bus - bus index, zero based
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*
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* Returns: 0 on success, not 0 on failure
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*
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*/
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int i2c_set_bus_num(unsigned int bus);
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/*
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* i2c_get_bus_num:
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*
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* Returns index of currently active I2C bus. Zero-based.
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*/
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unsigned int i2c_get_bus_num(void);
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/*
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* i2c_set_bus_speed:
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*
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* Change the speed of the active I2C bus
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*
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* speed - bus speed in Hz
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*
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* Returns: 0 on success, not 0 on failure
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*
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*/
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int i2c_set_bus_speed(unsigned int);
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/*
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* i2c_get_bus_speed:
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*
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* Returns speed of currently active I2C bus in Hz
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*/
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unsigned int i2c_get_bus_speed(void);
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#endif /* _I2C_H_ */
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