77c915ad61
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11361 a1c6a512-1295-4272-9138-f99709370657
178 lines
4.1 KiB
C
178 lines
4.1 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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* 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 January 2006
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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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* 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-pp5002.h"
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/* Local functions definitions */
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#define IPOD_I2C_BASE 0xc0008000
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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 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 (!(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 -1;
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}
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/* Public functions */
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int pp_i2c_read_byte(unsigned int addr, unsigned int *data)
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{
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if (pp_i2c_wait_not_busy() < 0)
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{
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return -1;
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}
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/* clear top 15 bits, left shift 1, or in 0x1 for a read */
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outb(((addr << 17) >> 16) | 0x1, IPOD_I2C_ADDR);
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outb(inb(IPOD_I2C_CTRL) | 0x20, IPOD_I2C_CTRL);
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outb(inb(IPOD_I2C_CTRL) | IPOD_I2C_SEND, IPOD_I2C_CTRL);
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if (pp_i2c_wait_not_busy() < 0)
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{
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return -1;
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}
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if (data)
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{
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*data = inb(IPOD_I2C_DATA0);
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}
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return 0;
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}
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int pp_i2c_send_bytes(unsigned int addr, unsigned int len, unsigned char *data)
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{
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int data_addr;
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unsigned 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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/* clear top 15 bits, left shift 1 */
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outb((addr << 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 < len; i++ )
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{
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outb(*data++, data_addr);
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data_addr += 4;
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}
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outb((inb(IPOD_I2C_CTRL) & ~0x26) | ((len-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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}
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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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int i2c_readbytes(unsigned int dev_addr, int addr, int len, unsigned char *data) {
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unsigned int temp;
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int i;
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pp_i2c_send_byte(dev_addr, addr);
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for (i = 0; i < len; i++) {
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pp_i2c_read_byte(dev_addr, &temp);
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data[i] = temp;
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}
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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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int data;
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pp_i2c_send_byte(dev_addr, addr);
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pp_i2c_read_byte(dev_addr, &data);
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return data;
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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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unsigned char data[2];
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data[0] = data0;
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data[1] = data1;
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return pp_i2c_send_bytes(addr, 2, data);
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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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outl(inl(0xcf005000) | 0x2, 0xcf005000);
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outl(inl(0xcf005030) | (1<<8), 0xcf005030);
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outl(inl(0xcf005030) & ~(1<<8), 0xcf005030);
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}
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