306 lines
6.4 KiB
C
306 lines
6.4 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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* PP502X and PP5002 I2C driver
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*
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* Based on code from the ipodlinux project - http://ipodlinux.org/
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* Adapted for Rockbox in November 2005
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*
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* Original file: linux/arch/armnommu/mach-ipod/hardware.c
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*
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* Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
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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 "cpu.h"
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#include "kernel.h"
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#include "thread.h"
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#include "logf.h"
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#include "system.h"
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#include "i2c.h"
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#include "i2c-pp.h"
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#include "ascodec.h"
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#include "as3514.h"
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#define I2C_CTRL (*(volatile unsigned char*)(I2C_BASE+0x00))
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#define I2C_ADDR (*(volatile unsigned char*)(I2C_BASE+0x04))
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#define I2C_DATA(X) (*(volatile unsigned char*)(I2C_BASE+0xc+(4*X)))
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#define I2C_STATUS (*(volatile unsigned char*)(I2C_BASE+0x1c))
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/* I2C_CTRL bit definitions */
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#define I2C_SEND 0x80
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/* I2C_STATUS bit definitions */
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#define I2C_BUSY (1<<6)
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/* Local functions definitions */
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static struct mutex i2c_mtx SHAREDBSS_ATTR;
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#define POLL_TIMEOUT (HZ)
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static int pp_i2c_wait_not_busy(void)
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{
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unsigned long timeout;
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timeout = current_tick + POLL_TIMEOUT;
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while (TIME_BEFORE(current_tick, timeout)) {
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if (!(I2C_STATUS & I2C_BUSY)) {
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return 0;
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}
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yield();
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}
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return -1;
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}
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static int pp_i2c_read_bytes(unsigned int addr, int len, unsigned char *data)
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{
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int i;
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if (len < 1 || len > 4)
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{
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return -1;
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}
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if (pp_i2c_wait_not_busy() < 0)
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{
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return -2;
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}
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{
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int old_irq_level = disable_irq_save();
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/* clear top 15 bits, left shift 1, or in 0x1 for a read */
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I2C_ADDR = ((addr << 17) >> 16) | 0x1;
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I2C_CTRL |= 0x20;
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I2C_CTRL = (I2C_CTRL & ~0x6) | ((len-1) << 1);
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I2C_CTRL |= I2C_SEND;
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restore_irq(old_irq_level);
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if (pp_i2c_wait_not_busy() < 0)
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{
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return -2;
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}
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old_irq_level = disable_irq_save();
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if (data)
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{
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for ( i = 0; i < len; i++ )
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*data++ = I2C_DATA(i);
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}
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restore_irq(old_irq_level);
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}
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return 0;
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}
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static int pp_i2c_send_bytes(unsigned int addr, int len, unsigned char *data)
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{
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int i;
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if (len < 1 || len > 4)
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{
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return -1;
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}
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if (pp_i2c_wait_not_busy() < 0)
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{
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return -2;
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}
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{
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int old_irq_level = disable_irq_save();
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/* clear top 15 bits, left shift 1 */
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I2C_ADDR = (addr << 17) >> 16;
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I2C_CTRL &= ~0x20;
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for ( i = 0; i < len; i++ )
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{
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I2C_DATA(i) = *data++;
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}
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I2C_CTRL = (I2C_CTRL & ~0x6) | ((len-1) << 1);
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I2C_CTRL |= I2C_SEND;
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restore_irq(old_irq_level);
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}
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return 0;
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}
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static int pp_i2c_send_byte(unsigned int addr, int data0)
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{
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unsigned char data[1];
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data[0] = data0;
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return pp_i2c_send_bytes(addr, 1, data);
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}
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/* Public functions */
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void i2c_lock(void)
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{
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mutex_lock(&i2c_mtx);
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}
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void i2c_unlock(void)
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{
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mutex_unlock(&i2c_mtx);
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}
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int i2c_readbytes(unsigned int dev_addr, int addr, int len, unsigned char *data)
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{
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int i, n;
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mutex_lock(&i2c_mtx);
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if (addr >= 0)
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pp_i2c_send_byte(dev_addr, addr);
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i = 0;
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while (len > 0)
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{
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n = (len < 4) ? len : 4;
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if (pp_i2c_read_bytes(dev_addr, n, data + i) < 0)
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break;
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len -= n;
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i += n;
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}
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mutex_unlock(&i2c_mtx);
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return i;
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}
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int i2c_readbyte(unsigned int dev_addr, int addr)
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{
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unsigned char data;
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mutex_lock(&i2c_mtx);
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pp_i2c_send_byte(dev_addr, addr);
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pp_i2c_read_bytes(dev_addr, 1, &data);
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mutex_unlock(&i2c_mtx);
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return (int)data;
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}
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int i2c_sendbytes(unsigned int addr, int len, const unsigned char *data)
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{
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int i, n;
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mutex_lock(&i2c_mtx);
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i = 0;
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while (len > 0)
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{
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n = (len < 4) ? len : 4;
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if (pp_i2c_send_bytes(addr, n, (unsigned char *)(data + i)) < 0)
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break;
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len -= n;
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i += n;
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}
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mutex_unlock(&i2c_mtx);
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return i;
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}
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int pp_i2c_send(unsigned int addr, int data0, int data1)
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{
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int retval;
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unsigned char data[2];
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data[0] = data0;
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data[1] = data1;
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mutex_lock(&i2c_mtx);
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retval = pp_i2c_send_bytes(addr, 2, data);
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mutex_unlock(&i2c_mtx);
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return retval;
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}
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void i2c_init(void)
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{
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/* From ipodlinux */
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mutex_init(&i2c_mtx);
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#ifdef IPOD_MINI
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/* GPIO port C disable port 0x10 */
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GPIOC_ENABLE &= ~0x10;
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/* GPIO port C disable port 0x20 */
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GPIOC_ENABLE &= ~0x20;
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#endif
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#if CONFIG_I2C == I2C_PP5002
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DEV_EN |= 0x2;
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#else
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DEV_EN |= DEV_I2C; /* Enable I2C */
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#endif
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DEV_RS |= DEV_I2C; /* Start I2C Reset */
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DEV_RS &=~DEV_I2C; /* End I2C Reset */
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#if CONFIG_I2C == I2C_PP5020
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outl(0x0, 0x600060a4);
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#if defined(PHILIPS_HDD1630)
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outl(inl(0x600060a4) | 0x20, 0x600060a4);
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outl(inl(0x7000c020) | 0x3, 0x7000c020);
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outl(0x55, 0x7000c02c);
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outl(0x54, 0x7000c030);
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#else
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outl(0x80 | (0 << 8), 0x600060a4);
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#endif
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#elif CONFIG_I2C == I2C_PP5024
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#if defined(SANSA_E200) || defined(PHILIPS_SA9200)
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/* Sansa OF sets this to 0x20 first, communicates with the AS3514
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then sets it to 0x23 - this still works fine though */
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outl(0x0, 0x600060a4);
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outl(0x23, 0x600060a4);
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#elif defined(SANSA_C200)
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/* This is the init sequence from the Sansa c200 bootloader.
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I'm not sure what's really necessary. */
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pp_i2c_wait_not_busy();
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outl(0, 0x600060a4);
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outl(0x64, 0x600060a4);
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outl(0x55, 0x7000c02c);
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outl(0x54, 0x7000c030);
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outl(0, 0x600060a4);
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outl(0x1e, 0x600060a4);
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ascodec_write(AS3514_SUPERVISOR, 5);
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#endif
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#endif
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i2c_readbyte(0x8, 0);
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}
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