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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* PP502X and PP5002 I2C driver
*
* Based on code from the ipodlinux project - http://ipodlinux.org/
* Adapted for Rockbox in November 2005
*
* Original file: linux/arch/armnommu/mach-ipod/hardware.c
*
* Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "cpu.h"
#include "kernel.h"
#include "thread.h"
#include "logf.h"
#include "system.h"
#include "i2c-pp.h"
/* Local functions definitions */
#define POLL_TIMEOUT (HZ)
static int pp_i2c_wait_not_busy(void)
{
unsigned long timeout;
timeout = current_tick + POLL_TIMEOUT;
while (TIME_BEFORE(current_tick, timeout)) {
if (!(I2C_STATUS & I2C_BUSY)) {
return 0;
}
priority_yield();
}
return -1;
}
static int pp_i2c_read_byte(unsigned int addr, unsigned int *data)
{
if (pp_i2c_wait_not_busy() < 0)
{
return -1;
}
{
unsigned int byte;
int old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL);
/* clear top 15 bits, left shift 1, or in 0x1 for a read */
I2C_ADDR = ((addr << 17) >> 16) | 0x1 ;
I2C_CTRL |= 0x20;
I2C_CTRL |= I2C_SEND;
set_irq_level(old_irq_level);
if (pp_i2c_wait_not_busy() < 0)
{
return -1;
}
old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL);
byte = I2C_DATA(0);
if (data)
*data = byte;
set_irq_level(old_irq_level);
}
return 0;
}
static int pp_i2c_send_bytes(unsigned int addr, unsigned int len, unsigned char *data)
{
unsigned int i;
if (len < 1 || len > 4)
{
return -1;
}
if (pp_i2c_wait_not_busy() < 0)
{
return -2;
}
{
int old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL);
/* clear top 15 bits, left shift 1 */
I2C_ADDR = (addr << 17) >> 16;
I2C_CTRL &= ~0x20;
for ( i = 0; i < len; i++ )
{
I2C_DATA(i) = *data++;
}
I2C_CTRL = (I2C_CTRL & ~0x26) | ((len-1) << 1);
I2C_CTRL |= I2C_SEND;
set_irq_level(old_irq_level);
}
return 0x0;
}
static int pp_i2c_send_byte(unsigned int addr, int data0)
{
unsigned char data[1];
data[0] = data0;
return pp_i2c_send_bytes(addr, 1, data);
}
/* Public functions */
static struct mutex i2c_mutex;
int i2c_readbytes(unsigned int dev_addr, int addr, int len, unsigned char *data) {
unsigned int temp;
int i;
spinlock_lock(&i2c_mutex);
pp_i2c_send_byte(dev_addr, addr);
for (i = 0; i < len; i++) {
pp_i2c_read_byte(dev_addr, &temp);
data[i] = temp;
}
spinlock_unlock(&i2c_mutex);
return i;
}
int i2c_readbyte(unsigned int dev_addr, int addr)
{
int data;
spinlock_lock(&i2c_mutex);
pp_i2c_send_byte(dev_addr, addr);
pp_i2c_read_byte(dev_addr, &data);
spinlock_unlock(&i2c_mutex);
return data;
}
int pp_i2c_send(unsigned int addr, int data0, int data1)
{
int retval;
unsigned char data[2];
data[0] = data0;
data[1] = data1;
spinlock_lock(&i2c_mutex);
retval = pp_i2c_send_bytes(addr, 2, data);
spinlock_unlock(&i2c_mutex);
return retval;
}
void i2c_init(void)
{
/* From ipodlinux */
#ifdef IPOD_MINI
/* GPIO port C disable port 0x10 */
GPIOC_ENABLE &= ~0x10;
/* GPIO port C disable port 0x20 */
GPIOC_ENABLE &= ~0x20;
#endif
#if CONFIG_I2C == I2C_PP5002
DEV_EN |= 0x2;
#else
DEV_EN |= DEV_I2C; /* Enable I2C */
#endif
DEV_RS |= DEV_I2C; /* Start I2C Reset */
DEV_RS &=~DEV_I2C; /* End I2C Reset */
#if CONFIG_I2C == I2C_PP5020
outl(0x0, 0x600060a4);
outl(0x80 | (0 << 8), 0x600060a4);
#elif CONFIG_I2C == I2C_PP5024
/* Sansa OF sets this to 0x20 first, communicates with the AS3514
then sets it to 0x23 - this still works fine though */
outl(0x0, 0x600060a4);
outl(0x23, 0x600060a4);
#endif
spinlock_init(&i2c_mutex);
i2c_readbyte(0x8, 0);
}
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