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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 by Dave Chapman
*
* 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 "logf.h"
#include "system.h"
#include "i2c-pp5020.h"
#define I2C_DEVICE_1 ((volatile unsigned char *)0)
#define I2C_DEVICE_2 ((volatile unsigned char *)0)
/* Local functions definitions */
static int i2c_write_byte(int device, unsigned char data);
static int i2c_gen_start(int device);
static void i2c_gen_stop(int device);
static volatile unsigned char *i2c_get_addr(int device);
#define IPOD_I2C_BASE 0x7000c000
#define IPOD_I2C_CTRL (IPOD_I2C_BASE+0x00)
#define IPOD_I2C_ADDR (IPOD_I2C_BASE+0x04)
#define IPOD_I2C_DATA0 (IPOD_I2C_BASE+0x0c)
#define IPOD_I2C_DATA1 (IPOD_I2C_BASE+0x10)
#define IPOD_I2C_DATA2 (IPOD_I2C_BASE+0x14)
#define IPOD_I2C_DATA3 (IPOD_I2C_BASE+0x18)
#define IPOD_I2C_STATUS (IPOD_I2C_BASE+0x1c)
/* IPOD_I2C_CTRL bit definitions */
#define IPOD_I2C_SEND 0x80
/* IPOD_I2C_STATUS bit definitions */
#define IPOD_I2C_BUSY (1<<6)
#define POLL_TIMEOUT (HZ)
static int
ipod_i2c_wait_not_busy(void)
{
unsigned long timeout;
#if 0
timeout = jiffies + POLL_TIMEOUT;
while (time_before(jiffies, timeout)) {
if (!(inb(IPOD_I2C_STATUS) & IPOD_I2C_BUSY)) {
return 0;
}
yield();
}
return -ETIMEDOUT;
#endif
}
/* Public functions */
void i2c_init(void)
{
/* From ipodlinux */
outl(inl(0x6000600c) | 0x1000, 0x6000600c); /* enable 12 */
outl(inl(0x60006004) | 0x1000, 0x60006004); /* start reset 12 */
outl(inl(0x60006004) & ~0x1000, 0x60006004); /* end reset 12 */
outl(0x0, 0x600060a4);
outl(0x80 | (0 << 8), 0x600060a4);
i2c_readbyte(0x8, 0);
}
void i2c_close(void)
{
}
/**
* Writes bytes to the selected device.
*
* Returns number of bytes successfully send or -1 if START failed
*/
int i2c_write(int device, unsigned char *buf, int count)
{
/* From ipodlinux */
int data_addr;
int i;
if (count < 1 || count > 4) {
return -2;
}
if (ipod_i2c_wait_not_busy() < 0) {
return -1;
}
// clear top 15 bits, left shift 1
outb((device << 17) >> 16, IPOD_I2C_ADDR);
outb(inb(IPOD_I2C_CTRL) & ~0x20, IPOD_I2C_CTRL);
data_addr = IPOD_I2C_DATA0;
for ( i = 0; i < count; i++ ) {
outb(*buf++, data_addr);
data_addr += 4;
}
outb((inb(IPOD_I2C_CTRL) & ~0x26) | ((count-1) << 1), IPOD_I2C_CTRL);
outb(inb(IPOD_I2C_CTRL) | IPOD_I2C_SEND, IPOD_I2C_CTRL);
return 0x0;
return count;
}
/* Write a byte to the interface, returns 0 on success, -1 otherwise. */
int i2c_write_byte(int device, unsigned char data)
{
if (ipod_i2c_wait_not_busy() < 0) {
return -2;
}
// clear top 15 bits, left shift 1
outb((device << 17) >> 16, IPOD_I2C_ADDR);
outb(inb(IPOD_I2C_CTRL) & ~0x20, IPOD_I2C_CTRL);
outb(data, IPOD_I2C_DATA0);
outb((inb(IPOD_I2C_CTRL) & ~0x26), IPOD_I2C_CTRL);
outb(inb(IPOD_I2C_CTRL) | IPOD_I2C_SEND, IPOD_I2C_CTRL);
return 0;
}
/* Returns 0 on success, -1 on failure */
int i2c_gen_start(int device)
{
volatile unsigned char *regs = i2c_get_addr(device);
long count = 0;
/* Wait for bus to become free */
while ((regs[O_MBSR] & IBB) && (count < MAX_LOOP))
{
yield();
count++;
}
if (count >= MAX_LOOP)
return -1;
regs[O_MBCR] |= MSTA | MTX; /* Generate START */
return 0;
}
void i2c_gen_stop(int device)
{
volatile unsigned char *regs = i2c_get_addr(device);
regs[O_MBCR] &= ~MSTA; /* Clear MSTA to generate STOP */
}
volatile unsigned char *i2c_get_addr(int device)
{
if (device == 1)
return I2C_DEVICE_1;
return I2C_DEVICE_2;
}
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