/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * * 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) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * 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.h" #include "i2c-pp.h" #ifdef HAVE_AS3514 #include "ascodec.h" #endif #define I2C_CTRL (*(volatile unsigned char*)(I2C_BASE+0x00)) #define I2C_ADDR (*(volatile unsigned char*)(I2C_BASE+0x04)) #define I2C_DATA(X) (*(volatile unsigned char*)(I2C_BASE+0xc+(4*X))) #define I2C_STATUS (*(volatile unsigned char*)(I2C_BASE+0x1c)) /* I2C_CTRL bit definitions */ #define I2C_SEND 0x80 /* I2C_STATUS bit definitions */ #define I2C_BUSY (1<<6) /* Local functions definitions */ static struct mutex i2c_mtx SHAREDBSS_ATTR; #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; } yield(); } return -1; } static int pp_i2c_read_bytes(unsigned int addr, int len, unsigned char *data) { int i; if (len < 1 || len > 4) { return -1; } if (pp_i2c_wait_not_busy() < 0) { return -2; } { int old_irq_level = disable_irq_save(); /* 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_CTRL & ~0x6) | ((len-1) << 1); I2C_CTRL |= I2C_SEND; restore_irq(old_irq_level); if (pp_i2c_wait_not_busy() < 0) { return -2; } old_irq_level = disable_irq_save(); if (data) { for ( i = 0; i < len; i++ ) *data++ = I2C_DATA(i); } restore_irq(old_irq_level); } return 0; } static int pp_i2c_send_bytes(unsigned int addr, int len, unsigned char *data) { int i; if (len < 1 || len > 4) { return -1; } if (pp_i2c_wait_not_busy() < 0) { return -2; } { int old_irq_level = disable_irq_save(); /* 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 & ~0x6) | ((len-1) << 1); I2C_CTRL |= I2C_SEND; restore_irq(old_irq_level); } return 0; } 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 */ void i2c_lock(void) { mutex_lock(&i2c_mtx); } void i2c_unlock(void) { mutex_unlock(&i2c_mtx); } int i2c_readbytes(unsigned int dev_addr, int addr, int len, unsigned char *data) { int i, n; mutex_lock(&i2c_mtx); if (addr >= 0) pp_i2c_send_byte(dev_addr, addr); i = 0; while (len > 0) { n = (len < 4) ? len : 4; if (pp_i2c_read_bytes(dev_addr, n, data + i) < 0) break; len -= n; i += n; } mutex_unlock(&i2c_mtx); return i; } int i2c_readbyte(unsigned int dev_addr, int addr) { unsigned char data; mutex_lock(&i2c_mtx); pp_i2c_send_byte(dev_addr, addr); pp_i2c_read_bytes(dev_addr, 1, &data); mutex_unlock(&i2c_mtx); return (int)data; } int i2c_sendbytes(unsigned int addr, int len, const unsigned char *data) { int i, n; mutex_lock(&i2c_mtx); i = 0; while (len > 0) { n = (len < 4) ? len : 4; if (pp_i2c_send_bytes(addr, n, (unsigned char *)(data + i)) < 0) break; len -= n; i += n; } mutex_unlock(&i2c_mtx); return i; } int pp_i2c_send(unsigned int addr, int data0, int data1) { int retval; unsigned char data[2]; data[0] = data0; data[1] = data1; mutex_lock(&i2c_mtx); retval = pp_i2c_send_bytes(addr, 2, data); mutex_unlock(&i2c_mtx); return retval; } void i2c_init(void) { /* From ipodlinux */ mutex_init(&i2c_mtx); #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); #if defined(PHILIPS_HDD1630) || defined(PHILIPS_HDD6330) || \ defined(SAMSUNG_YH820) || defined(SAMSUNG_YH920) || \ defined(SAMSUNG_YH925) || defined(PBELL_VIBE500) outl(inl(0x600060a4) | 0x20, 0x600060a4); outl(inl(0x7000c020) | 0x3, 0x7000c020); outl(0x55, 0x7000c02c); outl(0x54, 0x7000c030); #else outl(0x80 | (0 << 8), 0x600060a4); #endif #elif CONFIG_I2C == I2C_PP5024 #if defined(SANSA_E200) || defined(PHILIPS_SA9200) /* 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); #elif defined(SANSA_C200) /* This is the init sequence from the Sansa c200 bootloader. I'm not sure what's really necessary. */ pp_i2c_wait_not_busy(); outl(0, 0x600060a4); outl(0x64, 0x600060a4); outl(0x55, 0x7000c02c); outl(0x54, 0x7000c030); outl(0, 0x600060a4); outl(0x1e, 0x600060a4); ascodec_write(AS3514_SUPERVISOR, 5); #elif defined(PHILIPS_SA9200) outl(0x0, 0x600060a4); outl(inl(0x600060a4) | 0x20, 0x600060a4); outl(inl(0x7000c020) | 0x3, 0x7000c020); outl(0x55, 0x7000c02c); outl(0x54, 0x7000c030); #endif #endif i2c_readbyte(0x8, 0); }