mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 23:47:24 +00:00
315 lines
6.8 KiB
C
315 lines
6.8 KiB
C
/*
|
|
* (C) Copyright 2004
|
|
* DAVE Srl
|
|
* http://www.dave-tech.it
|
|
* http://www.wawnet.biz
|
|
* mailto:info@wawnet.biz
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <asm/hardware.h>
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
/*
|
|
setting up I2C support
|
|
*/
|
|
unsigned int save_F,save_PF,rIICCON,rPCONA,rPDATA,rPCONF,rPUPF;
|
|
|
|
save_F = PCONF;
|
|
save_PF = PUPF;
|
|
|
|
rPCONF = ((save_F & ~(0xF))| 0xa);
|
|
rPUPF = (save_PF | 0x3);
|
|
PCONF = rPCONF; /*PF0:IICSCL, PF1:IICSDA*/
|
|
PUPF = rPUPF; /* Disable pull-up */
|
|
|
|
/* Configuring pin for WC pin of EEprom */
|
|
rPCONA = PCONA;
|
|
rPCONA &= ~(1<<9);
|
|
PCONA = rPCONA;
|
|
|
|
rPDATA = PDATA;
|
|
rPDATA &= ~(1<<9);
|
|
PDATA = rPDATA;
|
|
|
|
/*
|
|
Enable ACK, IICCLK=MCLK/16, enable interrupt
|
|
75MHz/16/(12+1) = 390625 Hz
|
|
*/
|
|
rIICCON=(1<<7)|(0<<6)|(1<<5)|(0xC);
|
|
IICCON = rIICCON;
|
|
|
|
IICADD = slaveaddr;
|
|
}
|
|
|
|
/*
|
|
* Probe the given I2C chip address. Returns 0 if a chip responded,
|
|
* not 0 on failure.
|
|
*/
|
|
int i2c_probe(uchar chip)
|
|
{
|
|
/*
|
|
not implemented
|
|
*/
|
|
|
|
printf("i2c_probe chip %d\n", (int) chip);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
|
|
#define S3C44B0X_rIIC_INTPEND (1<<4)
|
|
#define S3C44B0X_rIIC_LAST_RECEIV_BIT (1<<0)
|
|
#define S3C44B0X_rIIC_INTERRUPT_ENABLE (1<<5)
|
|
#define S3C44B0_IIC_TIMEOUT 100
|
|
|
|
int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
|
|
{
|
|
|
|
int k, j, temp;
|
|
u32 rIICSTAT;
|
|
|
|
/*
|
|
send the device offset
|
|
*/
|
|
|
|
rIICSTAT = 0xD0;
|
|
IICSTAT = rIICSTAT;
|
|
|
|
IICDS = chip; /* this is a write operation... */
|
|
|
|
rIICSTAT |= (1<<5);
|
|
IICSTAT = rIICSTAT;
|
|
|
|
for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
|
|
temp = IICCON;
|
|
if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
|
|
break;
|
|
udelay(2000);
|
|
}
|
|
if (k==S3C44B0_IIC_TIMEOUT)
|
|
return -1;
|
|
|
|
/* wait and check ACK */
|
|
temp = IICSTAT;
|
|
if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT )
|
|
return -1;
|
|
|
|
IICDS = addr;
|
|
IICCON = IICCON & ~(S3C44B0X_rIIC_INTPEND);
|
|
|
|
/* wait and check ACK */
|
|
for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
|
|
temp = IICCON;
|
|
if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
|
|
break;
|
|
udelay(2000);
|
|
}
|
|
if (k==S3C44B0_IIC_TIMEOUT)
|
|
return -1;
|
|
|
|
temp = IICSTAT;
|
|
if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT )
|
|
return -1;
|
|
|
|
/*
|
|
now we can start with the read operation...
|
|
*/
|
|
|
|
IICDS = chip | 0x01; /* this is a read operation... */
|
|
|
|
rIICSTAT = 0x90; /*master recv*/
|
|
rIICSTAT |= (1<<5);
|
|
IICSTAT = rIICSTAT;
|
|
|
|
IICCON = IICCON & ~(S3C44B0X_rIIC_INTPEND);
|
|
|
|
/* wait and check ACK */
|
|
for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
|
|
temp = IICCON;
|
|
if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
|
|
break;
|
|
udelay(2000);
|
|
}
|
|
if (k==S3C44B0_IIC_TIMEOUT)
|
|
return -1;
|
|
|
|
temp = IICSTAT;
|
|
if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT )
|
|
return -1;
|
|
|
|
for (j=0; j<len-1; j++) {
|
|
|
|
/*clear pending bit to resume */
|
|
|
|
temp = IICCON & ~(S3C44B0X_rIIC_INTPEND);
|
|
IICCON = temp;
|
|
|
|
/* wait and check ACK */
|
|
for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
|
|
temp = IICCON;
|
|
if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
|
|
break;
|
|
udelay(2000);
|
|
}
|
|
if (k==S3C44B0_IIC_TIMEOUT)
|
|
return -1;
|
|
|
|
|
|
buffer[j] = IICDS; /*save readed data*/
|
|
|
|
} /*end for(j)*/
|
|
|
|
/*
|
|
reading the last data
|
|
unset ACK generation
|
|
*/
|
|
temp = IICCON & ~(S3C44B0X_rIIC_INTPEND | (1<<7));
|
|
IICCON = temp;
|
|
|
|
/* wait but NOT check ACK */
|
|
for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
|
|
temp = IICCON;
|
|
if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
|
|
break;
|
|
udelay(2000);
|
|
}
|
|
if (k==S3C44B0_IIC_TIMEOUT)
|
|
return -1;
|
|
|
|
buffer[j] = IICDS; /*save readed data*/
|
|
|
|
rIICSTAT = 0x90; /*master recv*/
|
|
|
|
/* Write operation Terminate sending STOP */
|
|
IICSTAT = rIICSTAT;
|
|
/*Clear Int Pending Bit to RESUME*/
|
|
temp = IICCON;
|
|
IICCON = temp & (~S3C44B0X_rIIC_INTPEND);
|
|
|
|
IICCON = IICCON | (1<<7); /*restore ACK generation*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
|
|
{
|
|
int j, k;
|
|
u32 rIICSTAT, temp;
|
|
|
|
|
|
/*
|
|
send the device offset
|
|
*/
|
|
|
|
rIICSTAT = 0xD0;
|
|
IICSTAT = rIICSTAT;
|
|
|
|
IICDS = chip; /* this is a write operation... */
|
|
|
|
rIICSTAT |= (1<<5);
|
|
IICSTAT = rIICSTAT;
|
|
|
|
IICCON = IICCON & ~(S3C44B0X_rIIC_INTPEND);
|
|
|
|
/* wait and check ACK */
|
|
for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
|
|
temp = IICCON;
|
|
if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
|
|
break;
|
|
udelay(2000);
|
|
}
|
|
if (k==S3C44B0_IIC_TIMEOUT)
|
|
return -1;
|
|
|
|
temp = IICSTAT;
|
|
if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT )
|
|
return -1;
|
|
|
|
IICDS = addr;
|
|
IICCON = IICCON & ~(S3C44B0X_rIIC_INTPEND);
|
|
|
|
/* wait and check ACK */
|
|
for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
|
|
temp = IICCON;
|
|
if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
|
|
break;
|
|
udelay(2000);
|
|
}
|
|
if (k==S3C44B0_IIC_TIMEOUT)
|
|
return -1;
|
|
|
|
temp = IICSTAT;
|
|
if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT )
|
|
return -1;
|
|
|
|
/*
|
|
now we can start with the read write operation
|
|
*/
|
|
for (j=0; j<len; j++) {
|
|
|
|
IICDS = buffer[j]; /*prerare data to write*/
|
|
|
|
/*clear pending bit to resume*/
|
|
|
|
temp = IICCON & ~(S3C44B0X_rIIC_INTPEND);
|
|
IICCON = temp;
|
|
|
|
/* wait but NOT check ACK */
|
|
for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
|
|
temp = IICCON;
|
|
if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
|
|
break;
|
|
|
|
udelay(2000);
|
|
}
|
|
|
|
if (k==S3C44B0_IIC_TIMEOUT)
|
|
return -1;
|
|
|
|
} /* end for(j) */
|
|
|
|
/* sending stop to terminate */
|
|
rIICSTAT = 0xD0; /*master send*/
|
|
IICSTAT = rIICSTAT;
|
|
/*Clear Int Pending Bit to RESUME*/
|
|
temp = IICCON;
|
|
IICCON = temp & (~S3C44B0X_rIIC_INTPEND);
|
|
|
|
return 0;
|
|
}
|