297 lines
7.4 KiB
C
297 lines
7.4 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2011 by Tomasz Moń
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* Copyright (C) 2008 by Maurus Cuelenaere
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*
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* DM320 I²C driver
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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
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "system.h"
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#include "kernel.h"
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#include "i2c-dm320.h"
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#ifdef HAVE_SOFTWARE_I2C
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#include "generic_i2c.h"
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#endif
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#ifndef HAVE_SOFTWARE_I2C
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static struct mutex i2c_mtx;
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static inline void i2c_begin(void)
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{
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mutex_lock(&i2c_mtx);
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}
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static inline void i2c_end(void)
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{
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mutex_unlock(&i2c_mtx);
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}
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#define I2C_SCS_COND_START 0x0001
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#define I2C_SCS_COND_STOP 0x0002
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#define I2C_SCS_XMIT 0x0004
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#define I2C_TX_ACK (1 << 8)
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static inline bool i2c_getack(void)
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{
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return (IO_I2C_RXDATA >> 8) & 1;
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}
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static inline void i2c_ack(void)
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{
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IO_I2C_TXDATA |= I2C_TX_ACK;
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}
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#define WAIT_FOR_I2C if(IO_I2C_SCS & 0x4){ \
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while(IO_I2C_SCS & 0x4) { \
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asm volatile("nop"); \
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} \
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} \
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static inline void i2c_start(void)
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{
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IO_I2C_SCS |= I2C_SCS_XMIT;
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return;
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}
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int i2c_write(unsigned short address, const unsigned char *buf, int count)
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{
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int i;
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int ret=0;
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i2c_begin();
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IO_I2C_TXDATA = ( (address << 1) & 0xFF ) | (address>0x7F ? 0 : 1 ) | I2C_TX_ACK;
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IO_I2C_SCS &= ~0x3; //clear conditions
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IO_I2C_SCS |= I2C_SCS_COND_START; // write 'start condition'
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i2c_start();
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WAIT_FOR_I2C;
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/* experimental */
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if(address>0x7F){ // check if it is 10-bit instead of 7-bit
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IO_I2C_TXDATA = ( (address >> 7) & 0xFF) | I2C_TX_ACK;
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IO_I2C_SCS &= ~0x3; //normal transfer
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i2c_start();
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WAIT_FOR_I2C;
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IO_I2C_TXDATA = ( (address << 1) & 0xFF) | 1 | I2C_TX_ACK;
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IO_I2C_SCS &= ~0x3; //clear conditions
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IO_I2C_SCS |= I2C_SCS_COND_START; //write 'start condition'
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i2c_start();
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WAIT_FOR_I2C;
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}
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for(i=0; i<count; i++){
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IO_I2C_TXDATA = buf[i] | I2C_TX_ACK;
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IO_I2C_SCS &= ~0x3; //normal transfer
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i2c_start();
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WAIT_FOR_I2C;
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if(!i2c_getack())
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ret = -1;
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}
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IO_I2C_SCS &= ~0x3; //clear conditions
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IO_I2C_SCS |= I2C_SCS_COND_STOP; //write 'stop condition'
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i2c_start();
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WAIT_FOR_I2C;
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i2c_end();
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return ret;
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}
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int i2c_read(unsigned short address, unsigned char* buf, int count)
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{
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int i;
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int ack=0;
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i2c_begin();
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IO_I2C_TXDATA = ( (address << 1) & 0xFF ) | (address>0x7F ? 0 : 1 ) | I2C_TX_ACK;
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IO_I2C_SCS &= ~0x3; //clear conditions
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IO_I2C_SCS |= I2C_SCS_COND_START; // write 'start condition'
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i2c_start();
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WAIT_FOR_I2C;
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/* experimental */
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if(address>0x7F){ // check if it is 10-bit instead of 7-bit
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IO_I2C_TXDATA = ( (address >> 7) & 0xFF ) | I2C_TX_ACK;
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IO_I2C_SCS &= ~0x3; //normal transfer
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i2c_start();
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WAIT_FOR_I2C;
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IO_I2C_TXDATA = ( (address << 1) & 0xFF ) | 1 | I2C_TX_ACK;
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IO_I2C_SCS &= ~0x3; //clear conditions
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IO_I2C_SCS |= I2C_SCS_COND_START; //write 'start condition'
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i2c_start();
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WAIT_FOR_I2C;
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}
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for(i=0; i<count; i++){
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unsigned short temp;
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IO_I2C_TXDATA = 0xFF | ( (count-1)==i ? I2C_TX_ACK : 0);
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IO_I2C_SCS &= ~0x3; //normal transfer
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i2c_start();
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WAIT_FOR_I2C;
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temp = IO_I2C_RXDATA;
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buf[i] = temp & 0xFF;
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ack = (temp & 0x100) >> 8;
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}
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IO_I2C_SCS &= ~0x3; //clear conditions
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IO_I2C_SCS |= I2C_SCS_COND_STOP; //write 'stop condition'
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i2c_start();
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WAIT_FOR_I2C;
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i2c_end();
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return ack;
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}
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void i2c_init(void)
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{
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mutex_init(&i2c_mtx);
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#ifdef CREATIVE_ZVx //TODO: mimic OF I2C clock settings; currently this is done by the bootloader
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IO_CLK_MOD2 &= ~CLK_MOD2_I2C; // turn I²C clock off (just to be sure)
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IO_CLK_LPCTL1 &= ~1; // set Powerdown mode to off
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IO_CLK_SEL0 &= ~0x800; // set I²C clock to PLLA
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IO_CLK_DIV4 &= ~0x1F; // I²C clock division = 1
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IO_CLK_MOD2 |= CLK_MOD2_I2C; // enable I²C clock
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#endif
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IO_I2C_SCS &= ~0x8; //set clock to 100 kHz
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IO_INTC_EINT2 &= ~INTR_EINT2_I2C; // disable I²C interrupt
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}
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#else /* Software I2C implementation */
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#ifdef SANSA_CONNECT
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/* SDA - GIO35 */
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#define SDA_SET_REG IO_GIO_BITSET2
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#define SDA_CLR_REG IO_GIO_BITCLR2
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#define SOFTI2C_SDA (1 << 3)
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/* SCL - GIO36 */
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#define SCL_SET_REG IO_GIO_BITSET2
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#define SCL_CLR_REG IO_GIO_BITCLR2
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#define SOFTI2C_SCL (1 << 4)
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#else
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#error Configure SDA and SCL lines
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#endif
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static int dm320_i2c_bus;
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static void dm320_scl_dir(bool out)
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{
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if (out)
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{
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IO_GIO_DIR2 &= ~(SOFTI2C_SCL);
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}
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else
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{
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IO_GIO_DIR2 |= SOFTI2C_SCL;
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}
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}
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static void dm320_sda_dir(bool out)
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{
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if (out)
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{
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IO_GIO_DIR2 &= ~(SOFTI2C_SDA);
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}
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else
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{
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IO_GIO_DIR2 |= SOFTI2C_SDA;
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}
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}
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static void dm320_scl_out(bool high)
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{
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if (high)
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{
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SCL_SET_REG = SOFTI2C_SCL;
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}
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else
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{
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SCL_CLR_REG = SOFTI2C_SCL;
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}
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}
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static void dm320_sda_out(bool high)
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{
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if (high)
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{
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SDA_SET_REG = SOFTI2C_SDA;
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}
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else
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{
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SDA_CLR_REG = SOFTI2C_SDA;
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}
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}
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static bool dm320_scl_in(void)
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{
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return (SCL_SET_REG & SOFTI2C_SCL);
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}
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static bool dm320_sda_in(void)
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{
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return (SDA_SET_REG & SOFTI2C_SDA);
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}
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/* simple delay */
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static void dm320_i2c_delay(int delay)
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{
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udelay(delay);
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}
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/* interface towards the generic i2c driver */
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static const struct i2c_interface dm320_i2c_interface = {
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.scl_dir = dm320_scl_dir,
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.sda_dir = dm320_sda_dir,
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.scl_out = dm320_scl_out,
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.sda_out = dm320_sda_out,
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.scl_in = dm320_scl_in,
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.sda_in = dm320_sda_in,
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.delay = dm320_i2c_delay,
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/* uncalibrated */
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.delay_hd_sta = 2,
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.delay_hd_dat = 2,
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.delay_su_dat = 2,
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.delay_su_sto = 2,
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.delay_su_sta = 2,
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.delay_thigh = 2
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};
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void i2c_init(void)
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{
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#ifdef SANSA_CONNECT
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IO_GIO_FSEL3 &= 0xFF0F; /* GIO35, GIO36 as normal GIO */
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IO_GIO_INV2 &= ~(SOFTI2C_SDA | SOFTI2C_SCL); /* not inverted */
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#endif
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/* generic_i2c takes care of setting direction */
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dm320_i2c_bus = i2c_add_node(&dm320_i2c_interface);
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}
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int i2c_write(unsigned short address, const unsigned char* buf, int count)
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{
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return i2c_write_data(dm320_i2c_bus, address, -1, buf, count);
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}
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int i2c_read(unsigned short address, unsigned char* buf, int count)
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{
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return i2c_read_data(dm320_i2c_bus, address, -1, buf, count);
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}
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int i2c_read_bytes(unsigned short address, unsigned short reg,
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unsigned char* buf, int count)
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{
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return i2c_read_data(dm320_i2c_bus, address, reg, buf, count);
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}
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#endif
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