mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 18:59:44 +00:00
e3e454cd72
There are some locations in the code which anticipate printf() being called before the console is ready by squelching printf() on gd->have_console. Move this squelching into printf(), vprintf(), puts() and putc(). Also make tstc() and getc() return 0 if console is not yet initialised Signed-off-by: Graeme Russ <graeme.russ@gmail.com> Tested-by: Simon Glass <sjg@chromium.org>
484 lines
11 KiB
C
484 lines
11 KiB
C
/*
|
|
* (C) Copyright 2001, 2002
|
|
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
|
*
|
|
* 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
|
|
*
|
|
* This has been changed substantially by Gerald Van Baren, Custom IDEAS,
|
|
* vanbaren@cideas.com. It was heavily influenced by LiMon, written by
|
|
* Neil Russell.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#ifdef CONFIG_MPC8260 /* only valid for MPC8260 */
|
|
#include <ioports.h>
|
|
#include <asm/io.h>
|
|
#endif
|
|
#if defined(CONFIG_AT91FAMILY)
|
|
#include <asm/io.h>
|
|
#include <asm/arch/hardware.h>
|
|
#include <asm/arch/at91_pio.h>
|
|
#ifdef CONFIG_AT91_LEGACY
|
|
#include <asm/arch/gpio.h>
|
|
#endif
|
|
#endif
|
|
#ifdef CONFIG_IXP425 /* only valid for IXP425 */
|
|
#include <asm/arch/ixp425.h>
|
|
#endif
|
|
#ifdef CONFIG_LPC2292
|
|
#include <asm/arch/hardware.h>
|
|
#endif
|
|
#if defined(CONFIG_MPC852T) || defined(CONFIG_MPC866)
|
|
#include <asm/io.h>
|
|
#endif
|
|
#include <i2c.h>
|
|
|
|
#if defined(CONFIG_SOFT_I2C_GPIO_SCL)
|
|
# include <asm/gpio.h>
|
|
|
|
# ifndef I2C_GPIO_SYNC
|
|
# define I2C_GPIO_SYNC
|
|
# endif
|
|
|
|
# ifndef I2C_INIT
|
|
# define I2C_INIT \
|
|
do { \
|
|
gpio_request(CONFIG_SOFT_I2C_GPIO_SCL, "soft_i2c"); \
|
|
gpio_request(CONFIG_SOFT_I2C_GPIO_SDA, "soft_i2c"); \
|
|
} while (0)
|
|
# endif
|
|
|
|
# ifndef I2C_ACTIVE
|
|
# define I2C_ACTIVE do { } while (0)
|
|
# endif
|
|
|
|
# ifndef I2C_TRISTATE
|
|
# define I2C_TRISTATE do { } while (0)
|
|
# endif
|
|
|
|
# ifndef I2C_READ
|
|
# define I2C_READ gpio_get_value(CONFIG_SOFT_I2C_GPIO_SDA)
|
|
# endif
|
|
|
|
# ifndef I2C_SDA
|
|
# define I2C_SDA(bit) \
|
|
do { \
|
|
if (bit) \
|
|
gpio_direction_input(CONFIG_SOFT_I2C_GPIO_SDA); \
|
|
else \
|
|
gpio_direction_output(CONFIG_SOFT_I2C_GPIO_SDA, 0); \
|
|
I2C_GPIO_SYNC; \
|
|
} while (0)
|
|
# endif
|
|
|
|
# ifndef I2C_SCL
|
|
# define I2C_SCL(bit) \
|
|
do { \
|
|
gpio_direction_output(CONFIG_SOFT_I2C_GPIO_SCL, bit); \
|
|
I2C_GPIO_SYNC; \
|
|
} while (0)
|
|
# endif
|
|
|
|
# ifndef I2C_DELAY
|
|
# define I2C_DELAY udelay(5) /* 1/4 I2C clock duration */
|
|
# endif
|
|
|
|
#endif
|
|
|
|
/* #define DEBUG_I2C */
|
|
|
|
#ifdef DEBUG_I2C
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
#endif
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Definitions
|
|
*/
|
|
|
|
#define RETRIES 0
|
|
|
|
#define I2C_ACK 0 /* PD_SDA level to ack a byte */
|
|
#define I2C_NOACK 1 /* PD_SDA level to noack a byte */
|
|
|
|
|
|
#ifdef DEBUG_I2C
|
|
#define PRINTD(fmt,args...) do { \
|
|
printf (fmt ,##args); \
|
|
} while (0)
|
|
#else
|
|
#define PRINTD(fmt,args...)
|
|
#endif
|
|
|
|
#if defined(CONFIG_I2C_MULTI_BUS)
|
|
static unsigned int i2c_bus_num __attribute__ ((section (".data"))) = 0;
|
|
#endif /* CONFIG_I2C_MULTI_BUS */
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Local functions
|
|
*/
|
|
#if !defined(CONFIG_SYS_I2C_INIT_BOARD)
|
|
static void send_reset (void);
|
|
#endif
|
|
static void send_start (void);
|
|
static void send_stop (void);
|
|
static void send_ack (int);
|
|
static int write_byte (uchar byte);
|
|
static uchar read_byte (int);
|
|
|
|
#if !defined(CONFIG_SYS_I2C_INIT_BOARD)
|
|
/*-----------------------------------------------------------------------
|
|
* Send a reset sequence consisting of 9 clocks with the data signal high
|
|
* to clock any confused device back into an idle state. Also send a
|
|
* <stop> at the end of the sequence for belts & suspenders.
|
|
*/
|
|
static void send_reset(void)
|
|
{
|
|
I2C_SOFT_DECLARATIONS /* intentional without ';' */
|
|
int j;
|
|
|
|
I2C_SCL(1);
|
|
I2C_SDA(1);
|
|
#ifdef I2C_INIT
|
|
I2C_INIT;
|
|
#endif
|
|
I2C_TRISTATE;
|
|
for(j = 0; j < 9; j++) {
|
|
I2C_SCL(0);
|
|
I2C_DELAY;
|
|
I2C_DELAY;
|
|
I2C_SCL(1);
|
|
I2C_DELAY;
|
|
I2C_DELAY;
|
|
}
|
|
send_stop();
|
|
I2C_TRISTATE;
|
|
}
|
|
#endif
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* START: High -> Low on SDA while SCL is High
|
|
*/
|
|
static void send_start(void)
|
|
{
|
|
I2C_SOFT_DECLARATIONS /* intentional without ';' */
|
|
|
|
I2C_DELAY;
|
|
I2C_SDA(1);
|
|
I2C_ACTIVE;
|
|
I2C_DELAY;
|
|
I2C_SCL(1);
|
|
I2C_DELAY;
|
|
I2C_SDA(0);
|
|
I2C_DELAY;
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* STOP: Low -> High on SDA while SCL is High
|
|
*/
|
|
static void send_stop(void)
|
|
{
|
|
I2C_SOFT_DECLARATIONS /* intentional without ';' */
|
|
|
|
I2C_SCL(0);
|
|
I2C_DELAY;
|
|
I2C_SDA(0);
|
|
I2C_ACTIVE;
|
|
I2C_DELAY;
|
|
I2C_SCL(1);
|
|
I2C_DELAY;
|
|
I2C_SDA(1);
|
|
I2C_DELAY;
|
|
I2C_TRISTATE;
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* ack should be I2C_ACK or I2C_NOACK
|
|
*/
|
|
static void send_ack(int ack)
|
|
{
|
|
I2C_SOFT_DECLARATIONS /* intentional without ';' */
|
|
|
|
I2C_SCL(0);
|
|
I2C_DELAY;
|
|
I2C_ACTIVE;
|
|
I2C_SDA(ack);
|
|
I2C_DELAY;
|
|
I2C_SCL(1);
|
|
I2C_DELAY;
|
|
I2C_DELAY;
|
|
I2C_SCL(0);
|
|
I2C_DELAY;
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Send 8 bits and look for an acknowledgement.
|
|
*/
|
|
static int write_byte(uchar data)
|
|
{
|
|
I2C_SOFT_DECLARATIONS /* intentional without ';' */
|
|
int j;
|
|
int nack;
|
|
|
|
I2C_ACTIVE;
|
|
for(j = 0; j < 8; j++) {
|
|
I2C_SCL(0);
|
|
I2C_DELAY;
|
|
I2C_SDA(data & 0x80);
|
|
I2C_DELAY;
|
|
I2C_SCL(1);
|
|
I2C_DELAY;
|
|
I2C_DELAY;
|
|
|
|
data <<= 1;
|
|
}
|
|
|
|
/*
|
|
* Look for an <ACK>(negative logic) and return it.
|
|
*/
|
|
I2C_SCL(0);
|
|
I2C_DELAY;
|
|
I2C_SDA(1);
|
|
I2C_TRISTATE;
|
|
I2C_DELAY;
|
|
I2C_SCL(1);
|
|
I2C_DELAY;
|
|
I2C_DELAY;
|
|
nack = I2C_READ;
|
|
I2C_SCL(0);
|
|
I2C_DELAY;
|
|
I2C_ACTIVE;
|
|
|
|
return(nack); /* not a nack is an ack */
|
|
}
|
|
|
|
#if defined(CONFIG_I2C_MULTI_BUS)
|
|
/*
|
|
* Functions for multiple I2C bus handling
|
|
*/
|
|
unsigned int i2c_get_bus_num(void)
|
|
{
|
|
return i2c_bus_num;
|
|
}
|
|
|
|
int i2c_set_bus_num(unsigned int bus)
|
|
{
|
|
#if defined(CONFIG_I2C_MUX)
|
|
if (bus < CONFIG_SYS_MAX_I2C_BUS) {
|
|
i2c_bus_num = bus;
|
|
} else {
|
|
int ret;
|
|
|
|
ret = i2x_mux_select_mux(bus);
|
|
i2c_init_board();
|
|
if (ret == 0)
|
|
i2c_bus_num = bus;
|
|
else
|
|
return ret;
|
|
}
|
|
#else
|
|
if (bus >= CONFIG_SYS_MAX_I2C_BUS)
|
|
return -1;
|
|
i2c_bus_num = bus;
|
|
#endif
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* if ack == I2C_ACK, ACK the byte so can continue reading, else
|
|
* send I2C_NOACK to end the read.
|
|
*/
|
|
static uchar read_byte(int ack)
|
|
{
|
|
I2C_SOFT_DECLARATIONS /* intentional without ';' */
|
|
int data;
|
|
int j;
|
|
|
|
/*
|
|
* Read 8 bits, MSB first.
|
|
*/
|
|
I2C_TRISTATE;
|
|
I2C_SDA(1);
|
|
data = 0;
|
|
for(j = 0; j < 8; j++) {
|
|
I2C_SCL(0);
|
|
I2C_DELAY;
|
|
I2C_SCL(1);
|
|
I2C_DELAY;
|
|
data <<= 1;
|
|
data |= I2C_READ;
|
|
I2C_DELAY;
|
|
}
|
|
send_ack(ack);
|
|
|
|
return(data);
|
|
}
|
|
|
|
/*=====================================================================*/
|
|
/* Public Functions */
|
|
/*=====================================================================*/
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Initialization
|
|
*/
|
|
void i2c_init (int speed, int slaveaddr)
|
|
{
|
|
#if defined(CONFIG_SYS_I2C_INIT_BOARD)
|
|
/* call board specific i2c bus reset routine before accessing the */
|
|
/* environment, which might be in a chip on that bus. For details */
|
|
/* about this problem see doc/I2C_Edge_Conditions. */
|
|
i2c_init_board();
|
|
#else
|
|
/*
|
|
* WARNING: Do NOT save speed in a static variable: if the
|
|
* I2C routines are called before RAM is initialized (to read
|
|
* the DIMM SPD, for instance), RAM won't be usable and your
|
|
* system will crash.
|
|
*/
|
|
send_reset ();
|
|
#endif
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Probe to see if a chip is present. Also good for checking for the
|
|
* completion of EEPROM writes since the chip stops responding until
|
|
* the write completes (typically 10mSec).
|
|
*/
|
|
int i2c_probe(uchar addr)
|
|
{
|
|
int rc;
|
|
|
|
/*
|
|
* perform 1 byte write transaction with just address byte
|
|
* (fake write)
|
|
*/
|
|
send_start();
|
|
rc = write_byte ((addr << 1) | 0);
|
|
send_stop();
|
|
|
|
return (rc ? 1 : 0);
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Read bytes
|
|
*/
|
|
int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
|
|
{
|
|
int shift;
|
|
PRINTD("i2c_read: chip %02X addr %02X alen %d buffer %p len %d\n",
|
|
chip, addr, alen, buffer, len);
|
|
|
|
#ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
|
|
/*
|
|
* EEPROM chips that implement "address overflow" are ones
|
|
* like Catalyst 24WC04/08/16 which has 9/10/11 bits of
|
|
* address and the extra bits end up in the "chip address"
|
|
* bit slots. This makes a 24WC08 (1Kbyte) chip look like
|
|
* four 256 byte chips.
|
|
*
|
|
* Note that we consider the length of the address field to
|
|
* still be one byte because the extra address bits are
|
|
* hidden in the chip address.
|
|
*/
|
|
chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
|
|
|
|
PRINTD("i2c_read: fix addr_overflow: chip %02X addr %02X\n",
|
|
chip, addr);
|
|
#endif
|
|
|
|
/*
|
|
* Do the addressing portion of a write cycle to set the
|
|
* chip's address pointer. If the address length is zero,
|
|
* don't do the normal write cycle to set the address pointer,
|
|
* there is no address pointer in this chip.
|
|
*/
|
|
send_start();
|
|
if(alen > 0) {
|
|
if(write_byte(chip << 1)) { /* write cycle */
|
|
send_stop();
|
|
PRINTD("i2c_read, no chip responded %02X\n", chip);
|
|
return(1);
|
|
}
|
|
shift = (alen-1) * 8;
|
|
while(alen-- > 0) {
|
|
if(write_byte(addr >> shift)) {
|
|
PRINTD("i2c_read, address not <ACK>ed\n");
|
|
return(1);
|
|
}
|
|
shift -= 8;
|
|
}
|
|
|
|
/* Some I2C chips need a stop/start sequence here,
|
|
* other chips don't work with a full stop and need
|
|
* only a start. Default behaviour is to send the
|
|
* stop/start sequence.
|
|
*/
|
|
#ifdef CONFIG_SOFT_I2C_READ_REPEATED_START
|
|
send_start();
|
|
#else
|
|
send_stop();
|
|
send_start();
|
|
#endif
|
|
}
|
|
/*
|
|
* Send the chip address again, this time for a read cycle.
|
|
* Then read the data. On the last byte, we do a NACK instead
|
|
* of an ACK(len == 0) to terminate the read.
|
|
*/
|
|
write_byte((chip << 1) | 1); /* read cycle */
|
|
while(len-- > 0) {
|
|
*buffer++ = read_byte(len == 0);
|
|
}
|
|
send_stop();
|
|
return(0);
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Write bytes
|
|
*/
|
|
int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
|
|
{
|
|
int shift, failures = 0;
|
|
|
|
PRINTD("i2c_write: chip %02X addr %02X alen %d buffer %p len %d\n",
|
|
chip, addr, alen, buffer, len);
|
|
|
|
send_start();
|
|
if(write_byte(chip << 1)) { /* write cycle */
|
|
send_stop();
|
|
PRINTD("i2c_write, no chip responded %02X\n", chip);
|
|
return(1);
|
|
}
|
|
shift = (alen-1) * 8;
|
|
while(alen-- > 0) {
|
|
if(write_byte(addr >> shift)) {
|
|
PRINTD("i2c_write, address not <ACK>ed\n");
|
|
return(1);
|
|
}
|
|
shift -= 8;
|
|
}
|
|
|
|
while(len-- > 0) {
|
|
if(write_byte(*buffer++)) {
|
|
failures++;
|
|
}
|
|
}
|
|
send_stop();
|
|
return(failures);
|
|
}
|