Signed-off-by: Valentin Yakovenkov <yakovenkov@niistt.ru> Signed-off-by: Mike Frysinger <vapier@gentoo.org>master
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/*
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* File: drivers/i2c/pca9564.c |
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* Based on: drivers/i2c/s3c44b0_i2c.c |
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* Author: |
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* |
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* Created: 2009-06-23 |
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* Description: PCA9564 i2c bridge driver |
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* |
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* Modified: |
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* Copyright 2009 CJSC "NII STT", http://www.niistt.ru/
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* |
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* Bugs: |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (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, see the file COPYING, or write |
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* to the Free Software Foundation, Inc., |
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <common.h> |
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#include <i2c.h> |
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#include <pca9564.h> |
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#include <asm/io.h> |
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#define PCA_STA (CONFIG_PCA9564_BASE + 0) |
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#define PCA_TO (CONFIG_PCA9564_BASE + 0) |
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#define PCA_DAT (CONFIG_PCA9564_BASE + (1 << 2)) |
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#define PCA_ADR (CONFIG_PCA9564_BASE + (2 << 2)) |
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#define PCA_CON (CONFIG_PCA9564_BASE + (3 << 2)) |
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static unsigned char pca_read_reg(unsigned int reg) |
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{ |
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return readb((void *)reg); |
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} |
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static void pca_write_reg(unsigned int reg, unsigned char value) |
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{ |
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writeb(value, (void *)reg); |
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} |
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static int pca_wait_busy(void) |
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{ |
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unsigned int timeout = 10000; |
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while (!(pca_read_reg(PCA_CON) & PCA_CON_SI) && --timeout) |
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udelay(1); |
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if (timeout == 0) |
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debug("I2C timeout!\n"); |
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debug("CON = 0x%02x, STA = 0x%02x\n", pca_read_reg(PCA_CON), |
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pca_read_reg(PCA_STA)); |
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return timeout ? 0 : 1; |
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} |
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/*=====================================================================*/ |
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/* Public Functions */ |
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/*=====================================================================*/ |
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/*-----------------------------------------------------------------------
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* Initialization |
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*/ |
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void i2c_init(int speed, int slaveaddr) |
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{ |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO | speed); |
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} |
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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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unsigned char res; |
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pca_write_reg(PCA_CON, PCA_CON_STA | PCA_CON_ENSIO); |
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pca_wait_busy(); |
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pca_write_reg(PCA_CON, PCA_CON_STA | PCA_CON_ENSIO); |
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pca_write_reg(PCA_DAT, (chip << 1) | 1); |
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res = pca_wait_busy(); |
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if ((res == 0) && (pca_read_reg(PCA_STA) == 0x48)) |
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res = 1; |
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pca_write_reg(PCA_CON, PCA_CON_STO | PCA_CON_ENSIO); |
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return res; |
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} |
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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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{ |
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int i; |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STA); |
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pca_wait_busy(); |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO); |
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pca_write_reg(PCA_DAT, (chip << 1)); |
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pca_wait_busy(); |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO); |
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if (alen > 0) { |
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pca_write_reg(PCA_DAT, addr); |
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pca_wait_busy(); |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO); |
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} |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STO); |
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udelay(500); |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STA); |
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pca_wait_busy(); |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO); |
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pca_write_reg(PCA_DAT, (chip << 1) | 1); |
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pca_wait_busy(); |
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for (i = 0; i < len; ++i) { |
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if (i == len - 1) |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO); |
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else |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_AA); |
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pca_wait_busy(); |
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buffer[i] = pca_read_reg(PCA_DAT); |
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} |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STO); |
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return 0; |
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} |
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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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int i; |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO | PCA_CON_STA); |
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pca_wait_busy(); |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO); |
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pca_write_reg(PCA_DAT, chip << 1); |
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pca_wait_busy(); |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO); |
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if (alen > 0) { |
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pca_write_reg(PCA_DAT, addr); |
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pca_wait_busy(); |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO); |
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} |
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for (i = 0; i < len; ++i) { |
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pca_write_reg(PCA_DAT, buffer[i]); |
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pca_wait_busy(); |
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pca_write_reg(PCA_CON, PCA_CON_ENSIO); |
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} |
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pca_write_reg(PCA_CON, PCA_CON_STO | PCA_CON_ENSIO); |
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return 0; |
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} |
@ -0,0 +1,50 @@ |
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/*
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* File: include/pca9564.h |
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* Author: |
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* |
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* Created: 2009-06-23 |
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* Description: PCA9564 i2c bridge driver |
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* |
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* Modified: |
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* Copyright 2009 CJSC "NII STT", http://www.niistt.ru/
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* |
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* Bugs: |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (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, see the file COPYING, or write |
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* to the Free Software Foundation, Inc., |
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef _PCA9564_H |
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#define _PCA9564_H |
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/* Clock speeds for the bus */ |
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#define PCA_CON_330kHz 0x00 |
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#define PCA_CON_288kHz 0x01 |
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#define PCA_CON_217kHz 0x02 |
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#define PCA_CON_146kHz 0x03 |
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#define PCA_CON_88kHz 0x04 |
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#define PCA_CON_59kHz 0x05 |
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#define PCA_CON_44kHz 0x06 |
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#define PCA_CON_36kHz 0x07 |
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#define PCA_CON_AA 0x80 /* Assert Acknowledge */ |
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#define PCA_CON_ENSIO 0x40 /* Enable */ |
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#define PCA_CON_STA 0x20 /* Start */ |
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#define PCA_CON_STO 0x10 /* Stop */ |
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#define PCA_CON_SI 0x08 /* Serial Interrupt */ |
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#define PCA_CON_CR 0x07 /* Clock Rate (MASK) */ |
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#endif |
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