77372d1218
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7781 a1c6a512-1295-4272-9138-f99709370657
189 lines
4.5 KiB
C
189 lines
4.5 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) 2005 by Dave Chapman
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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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 "logf.h"
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#include "system.h"
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#include "i2c-pp5020.h"
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#define I2C_DEVICE_1 ((volatile unsigned char *)0)
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#define I2C_DEVICE_2 ((volatile unsigned char *)0)
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/* Local functions definitions */
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static int i2c_write_byte(int device, unsigned char data);
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static int i2c_gen_start(int device);
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static void i2c_gen_stop(int device);
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static volatile unsigned char *i2c_get_addr(int device);
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#define IPOD_I2C_BASE 0x7000c000
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#define IPOD_I2C_CTRL (IPOD_I2C_BASE+0x00)
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#define IPOD_I2C_ADDR (IPOD_I2C_BASE+0x04)
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#define IPOD_I2C_DATA0 (IPOD_I2C_BASE+0x0c)
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#define IPOD_I2C_DATA1 (IPOD_I2C_BASE+0x10)
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#define IPOD_I2C_DATA2 (IPOD_I2C_BASE+0x14)
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#define IPOD_I2C_DATA3 (IPOD_I2C_BASE+0x18)
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#define IPOD_I2C_STATUS (IPOD_I2C_BASE+0x1c)
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/* IPOD_I2C_CTRL bit definitions */
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#define IPOD_I2C_SEND 0x80
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/* IPOD_I2C_STATUS bit definitions */
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#define IPOD_I2C_BUSY (1<<6)
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#define POLL_TIMEOUT (HZ)
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static int
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ipod_i2c_wait_not_busy(void)
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{
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unsigned long timeout;
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#if 0
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timeout = jiffies + POLL_TIMEOUT;
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while (time_before(jiffies, timeout)) {
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if (!(inb(IPOD_I2C_STATUS) & IPOD_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 -ETIMEDOUT;
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#endif
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}
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/* Public functions */
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void i2c_init(void)
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{
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/* From ipodlinux */
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outl(inl(0x6000600c) | 0x1000, 0x6000600c); /* enable 12 */
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outl(inl(0x60006004) | 0x1000, 0x60006004); /* start reset 12 */
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outl(inl(0x60006004) & ~0x1000, 0x60006004); /* end reset 12 */
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outl(0x0, 0x600060a4);
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outl(0x80 | (0 << 8), 0x600060a4);
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i2c_readbyte(0x8, 0);
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}
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void i2c_close(void)
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{
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}
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/**
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* Writes bytes to the selected device.
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*
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* Returns number of bytes successfully send or -1 if START failed
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*/
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int i2c_write(int device, unsigned char *buf, int count)
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{
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/* From ipodlinux */
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int data_addr;
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int i;
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if (count < 1 || count > 4) {
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return -2;
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}
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if (ipod_i2c_wait_not_busy() < 0) {
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return -1;
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}
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// clear top 15 bits, left shift 1
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outb((device << 17) >> 16, IPOD_I2C_ADDR);
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outb(inb(IPOD_I2C_CTRL) & ~0x20, IPOD_I2C_CTRL);
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data_addr = IPOD_I2C_DATA0;
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for ( i = 0; i < count; i++ ) {
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outb(*buf++, data_addr);
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data_addr += 4;
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}
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outb((inb(IPOD_I2C_CTRL) & ~0x26) | ((count-1) << 1), IPOD_I2C_CTRL);
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outb(inb(IPOD_I2C_CTRL) | IPOD_I2C_SEND, IPOD_I2C_CTRL);
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return 0x0;
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return count;
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}
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/* Write a byte to the interface, returns 0 on success, -1 otherwise. */
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int i2c_write_byte(int device, unsigned char data)
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{
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if (ipod_i2c_wait_not_busy() < 0) {
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return -2;
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}
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// clear top 15 bits, left shift 1
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outb((device << 17) >> 16, IPOD_I2C_ADDR);
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outb(inb(IPOD_I2C_CTRL) & ~0x20, IPOD_I2C_CTRL);
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outb(data, IPOD_I2C_DATA0);
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outb((inb(IPOD_I2C_CTRL) & ~0x26), IPOD_I2C_CTRL);
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outb(inb(IPOD_I2C_CTRL) | IPOD_I2C_SEND, IPOD_I2C_CTRL);
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return 0;
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}
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/* Returns 0 on success, -1 on failure */
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int i2c_gen_start(int device)
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{
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volatile unsigned char *regs = i2c_get_addr(device);
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long count = 0;
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/* Wait for bus to become free */
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while ((regs[O_MBSR] & IBB) && (count < MAX_LOOP))
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{
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yield();
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count++;
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}
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if (count >= MAX_LOOP)
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return -1;
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regs[O_MBCR] |= MSTA | MTX; /* Generate START */
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return 0;
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}
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void i2c_gen_stop(int device)
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{
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volatile unsigned char *regs = i2c_get_addr(device);
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regs[O_MBCR] &= ~MSTA; /* Clear MSTA to generate STOP */
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}
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volatile unsigned char *i2c_get_addr(int device)
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{
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if (device == 1)
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return I2C_DEVICE_1;
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return I2C_DEVICE_2;
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}
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