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new PCA9564 i2c bridge driver 

Signed-off-by: Valentin Yakovenkov <yakovenkov@niistt.ru>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Valentin Yakovenkov 2009-10-26 18:49:06 -04:00 committed by Heiko Schocher
parent 08a1c6258c
commit 08ea550eef
3 changed files with 240 additions and 0 deletions
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1
drivers/i2c/Makefile
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@ -33,6 +33,7 @@ COBJS-$(CONFIG_I2C_MXC) += mxc_i2c.o
COBJS-$(CONFIG_DRIVER_OMAP1510_I2C) += omap1510_i2c.o
COBJS-$(CONFIG_DRIVER_OMAP24XX_I2C) += omap24xx_i2c.o
COBJS-$(CONFIG_DRIVER_OMAP34XX_I2C) += omap24xx_i2c.o
COBJS-$(CONFIG_PCA9564_I2C) += pca9564_i2c.o
COBJS-$(CONFIG_DRIVER_S3C24X0_I2C) += s3c24x0_i2c.o
COBJS-$(CONFIG_S3C44B0_I2C) += s3c44b0_i2c.o
COBJS-$(CONFIG_SOFT_I2C) += soft_i2c.o

189
drivers/i2c/pca9564_i2c.c Normal file
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@ -0,0 +1,189 @@
/*
* File: drivers/i2c/pca9564.c
* Based on: drivers/i2c/s3c44b0_i2c.c
* Author:
*
* Created: 2009-06-23
* Description: PCA9564 i2c bridge driver
*
* Modified:
* Copyright 2009 CJSC "NII STT", http://www.niistt.ru/
*
* Bugs:
*
* 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, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <common.h>
#include <i2c.h>
#include <pca9564.h>
#include <asm/io.h>
#define PCA_STA (CONFIG_PCA9564_BASE + 0)
#define PCA_TO (CONFIG_PCA9564_BASE + 0)
#define PCA_DAT (CONFIG_PCA9564_BASE + (1 << 2))
#define PCA_ADR (CONFIG_PCA9564_BASE + (2 << 2))
#define PCA_CON (CONFIG_PCA9564_BASE + (3 << 2))
static unsigned char pca_read_reg(unsigned int reg)
{
return readb((void *)reg);
}
static void pca_write_reg(unsigned int reg, unsigned char value)
{
writeb(value, (void *)reg);
}
static int pca_wait_busy(void)
{
unsigned int timeout = 10000;
while (!(pca_read_reg(PCA_CON) & PCA_CON_SI) && --timeout)
udelay(1);
if (timeout == 0)
debug("I2C timeout!\n");
debug("CON = 0x%02x, STA = 0x%02x\n", pca_read_reg(PCA_CON),
pca_read_reg(PCA_STA));
return timeout ? 0 : 1;
}
/*=====================================================================*/
/* Public Functions */
/*=====================================================================*/
/*-----------------------------------------------------------------------
* Initialization
*/
void i2c_init(int speed, int slaveaddr)
{
pca_write_reg(PCA_CON, PCA_CON_ENSIO | speed);
}
/*
* Probe the given I2C chip address. Returns 0 if a chip responded,
* not 0 on failure.
*/
int i2c_probe(uchar chip)
{
unsigned char res;
pca_write_reg(PCA_CON, PCA_CON_STA | PCA_CON_ENSIO);
pca_wait_busy();
pca_write_reg(PCA_CON, PCA_CON_STA | PCA_CON_ENSIO);
pca_write_reg(PCA_DAT, (chip << 1) | 1);
res = pca_wait_busy();
if ((res == 0) && (pca_read_reg(PCA_STA) == 0x48))
res = 1;
pca_write_reg(PCA_CON, PCA_CON_STO | PCA_CON_ENSIO);
return res;
}
/*
* 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 i;
pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STA);
pca_wait_busy();
pca_write_reg(PCA_CON, PCA_CON_ENSIO);
pca_write_reg(PCA_DAT, (chip << 1));
pca_wait_busy();
pca_write_reg(PCA_CON, PCA_CON_ENSIO);
if (alen > 0) {
pca_write_reg(PCA_DAT, addr);
pca_wait_busy();
pca_write_reg(PCA_CON, PCA_CON_ENSIO);
}
pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STO);
udelay(500);
pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STA);
pca_wait_busy();
pca_write_reg(PCA_CON, PCA_CON_ENSIO);
pca_write_reg(PCA_DAT, (chip << 1) | 1);
pca_wait_busy();
for (i = 0; i < len; ++i) {
if (i == len - 1)
pca_write_reg(PCA_CON, PCA_CON_ENSIO);
else
pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_AA);
pca_wait_busy();
buffer[i] = pca_read_reg(PCA_DAT);
}
pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STO);
return 0;
}
int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
{
int i;
pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STA);
pca_wait_busy();
pca_write_reg(PCA_CON, PCA_CON_ENSIO);
pca_write_reg(PCA_DAT, chip << 1);
pca_wait_busy();
pca_write_reg(PCA_CON, PCA_CON_ENSIO);
if (alen > 0) {
pca_write_reg(PCA_DAT, addr);
pca_wait_busy();
pca_write_reg(PCA_CON, PCA_CON_ENSIO);
}
for (i = 0; i < len; ++i) {
pca_write_reg(PCA_DAT, buffer[i]);
pca_wait_busy();
pca_write_reg(PCA_CON, PCA_CON_ENSIO);
}
pca_write_reg(PCA_CON, PCA_CON_STO | PCA_CON_ENSIO);
return 0;
}

50
include/pca9564.h Normal file
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@ -0,0 +1,50 @@
/*
* File: include/pca9564.h
* Author:
*
* Created: 2009-06-23
* Description: PCA9564 i2c bridge driver
*
* Modified:
* Copyright 2009 CJSC "NII STT", http://www.niistt.ru/
*
* Bugs:
*
* 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, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _PCA9564_H
#define _PCA9564_H
/* Clock speeds for the bus */
#define PCA_CON_330kHz 0x00
#define PCA_CON_288kHz 0x01
#define PCA_CON_217kHz 0x02
#define PCA_CON_146kHz 0x03
#define PCA_CON_88kHz 0x04
#define PCA_CON_59kHz 0x05
#define PCA_CON_44kHz 0x06
#define PCA_CON_36kHz 0x07
#define PCA_CON_AA 0x80 /* Assert Acknowledge */
#define PCA_CON_ENSIO 0x40 /* Enable */
#define PCA_CON_STA 0x20 /* Start */
#define PCA_CON_STO 0x10 /* Stop */
#define PCA_CON_SI 0x08 /* Serial Interrupt */
#define PCA_CON_CR 0x07 /* Clock Rate (MASK) */
#endif