261 lines
6.9 KiB
C
261 lines
6.9 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) 2006 by Michael Sevakis
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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 <stdlib.h>
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#include "config.h"
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#include "system.h"
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#include "kernel.h"
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#include "logf.h"
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#include "audio.h"
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#include "sound.h"
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#include "file.h"
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#include "pcm-internal.h"
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/* PCM interrupt routine lockout */
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static struct
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{
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int locked;
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unsigned long state;
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} dma_play_lock =
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{
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.locked = 0,
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.state = 0,
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};
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#define FIFO_COUNT ((IISFCON >> 6) & 0x3F)
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/* Setup for the DMA controller */
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#define DMA_CONTROL_SETUP ((1<<31) | (1<<29) | (1<<23) | (1<<22) | (1<<20))
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#ifdef HAVE_UDA1341
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/* for PCLK = 50 MHz, frame size = 32 */
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/* [prescaler, master clock rate] */
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static const unsigned char pcm_freq_parms[HW_NUM_FREQ][2] =
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{
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[HW_FREQ_44] = { 2, IISMOD_MASTER_CLOCK_384FS },
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[HW_FREQ_22] = { 8, IISMOD_MASTER_CLOCK_256FS },
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[HW_FREQ_11] = { 17, IISMOD_MASTER_CLOCK_256FS },
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};
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#endif
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/* DMA count has hit zero - no more data */
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/* Get more data from the callback and top off the FIFO */
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void fiq_handler(void) __attribute__((interrupt ("FIQ")));
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/* Mask the DMA interrupt */
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void pcm_play_lock(void)
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{
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if (++dma_play_lock.locked == 1)
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bitset32(&INTMSK, DMA2_MASK);
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}
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/* Unmask the DMA interrupt if enabled */
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void pcm_play_unlock(void)
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{
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if (--dma_play_lock.locked == 0)
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bitclr32(&INTMSK, dma_play_lock.state);
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}
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void pcm_play_dma_init(void)
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{
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/* There seem to be problems when changing the IIS interface configuration
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* when a clock is not present.
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*/
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bitset32(&CLKCON, 1<<17);
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#ifdef HAVE_UDA1341
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/* master, transmit mode, 16 bit samples, BCLK 32fs, PCLK */
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IISMOD = IISMOD_MASTER_CLOCK_PCLK | IISMOD_MASTER_MODE | IISMOD_TRANSMIT_MODE
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| IISMOD_16_BIT | IISMOD_MASTER_CLOCK_256FS | IISMOD_BIT_CLOCK_32FS;
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/* TX idle, enable prescaler */
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IISCON |= IISCON_TX_IDLE | IISCON_IIS_PRESCALER_ENABLE;
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#else
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/* slave, transmit mode, 16 bit samples - MCLK 384fs - use 16.9344Mhz -
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BCLK 32fs */
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IISMOD = (1<<9) | (1<<8) | (2<<6) | (1<<3) | (1<<2) | (1<<0);
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/* RX,TX off,on */
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IISCON |= (1<<3) | (1<<2);
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#endif
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bitclr32(&CLKCON, 1<<17);
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audiohw_init();
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/* init GPIO */
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#ifdef GIGABEAT_F
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/* GPCCON = (GPCCON & ~(3<<14)) | (1<<14); */
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S3C244_GPIO_CONFIG (GPCCON, 7, GPIO_OUTPUT);
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GPCDAT |= (1<<7);
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#endif
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/* GPE4=I2SDO, GPE3=I2SDI, GPE2=CDCLK, GPE1=I2SSCLK, GPE0=I2SLRCK */
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GPECON = (GPECON & ~0x3ff) | 0x2aa;
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/* Do not service DMA requests, yet */
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/* clear any pending int and mask it */
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bitset32(&INTMSK, DMA2_MASK);
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SRCPND = DMA2_MASK;
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/* connect to FIQ */
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bitset32(&INTMOD, DMA2_MASK);
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}
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void pcm_play_dma_postinit(void)
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{
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audiohw_postinit();
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}
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void pcm_dma_apply_settings(void)
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{
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#ifdef HAVE_UDA1341
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unsigned int reg_val;
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/* set prescaler and master clock rate according to freq */
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reg_val = (pcm_freq_parms [pcm_fsel][0] << 5) | pcm_freq_parms [pcm_fsel][0];
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IISMOD = (IISMOD & ~IISMOD_MASTER_CLOCK_384FS) | pcm_freq_parms [pcm_fsel][1] ;
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IISPSR = reg_val;
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#endif
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audiohw_set_frequency(pcm_fsel);
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}
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/* Connect the DMA and start filling the FIFO */
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static void play_start_pcm(void)
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{
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/* clear pending DMA interrupt */
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SRCPND = DMA2_MASK;
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/* Flush any pending writes */
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commit_dcache_range((char*)DISRC2-0x30000000, (DCON2 & 0xFFFFF) * 2);
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/* unmask DMA interrupt when unlocking */
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dma_play_lock.state = DMA2_MASK;
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/* turn on the request */
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IISCON |= (1<<5);
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/* Activate the channel */
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DMASKTRIG2 = 0x2;
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/* turn off the idle */
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IISCON &= ~(1<<3);
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#ifdef HAVE_UDA1341
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IISMOD = (IISMOD & ~IISMOD_MASTER_CLOCK_384FS) | pcm_freq_parms [pcm_fsel][1] ;
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IISPSR = (pcm_freq_parms [pcm_fsel][0] << 5) | pcm_freq_parms [pcm_fsel][0];
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#endif
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/* start the IIS */
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IISCON |= (1<<0);
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}
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/* Disconnect the DMA and wait for the FIFO to clear */
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static void play_stop_pcm(void)
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{
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/* Mask DMA interrupt */
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bitset32(&INTMSK, DMA2_MASK);
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/* De-Activate the DMA channel */
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DMASKTRIG2 = 0x4;
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/* are we playing? wait for the chunk to finish */
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if (dma_play_lock.state != 0)
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{
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/* wait for the FIFO to empty and DMA to stop */
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while ((IISCON & (1<<7)) || (DMASKTRIG2 & 0x2));
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}
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/* Keep interrupt masked when unlocking */
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dma_play_lock.state = 0;
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/* turn off the request */
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IISCON &= ~(1<<5);
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/* turn on the idle */
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IISCON |= (1<<3);
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/* stop the IIS */
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IISCON &= ~(1<<0);
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}
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void pcm_play_dma_start(const void *addr, size_t size)
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{
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/* Enable the IIS clock */
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bitset32(&CLKCON, 1<<17);
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/* stop any DMA in progress - idle IIS */
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play_stop_pcm();
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/* connect DMA to the FIFO and enable the FIFO */
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IISFCON = (1<<15) | (1<<13);
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/* set DMA dest */
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DIDST2 = (unsigned int)&IISFIFO;
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/* IIS is on the APB bus, INT when TC reaches 0, fixed dest addr */
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DIDSTC2 = 0x03;
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/* set DMA source and options */
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DISRC2 = (unsigned int)addr + 0x30000000;
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/* How many transfers to make - we transfer half-word at a time = 2 bytes */
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/* DMA control: CURR_TC int, single service mode, I2SSDO int, HW trig */
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/* no auto-reload, half-word (16bit) */
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DCON2 = DMA_CONTROL_SETUP | (size / 2);
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DISRCC2 = 0x00; /* memory is on AHB bus, increment addresses */
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play_start_pcm();
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}
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/* Promptly stop DMA transfers and stop IIS */
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void pcm_play_dma_stop(void)
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{
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play_stop_pcm();
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/* Disconnect the IIS clock */
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bitclr32(&CLKCON, 1<<17);
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}
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void fiq_handler(void)
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{
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static const void *start;
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static size_t size;
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/* clear any pending interrupt */
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SRCPND = DMA2_MASK;
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/* Buffer empty. Try to get more. */
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if (!pcm_play_dma_complete_callback(PCM_DMAST_OK, &start, &size))
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return;
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/* Flush any pending cache writes */
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commit_dcache_range(start, size);
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/* set the new DMA values */
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DCON2 = DMA_CONTROL_SETUP | (size >> 1);
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DISRC2 = (unsigned int)start + 0x30000000;
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/* Re-Activate the channel */
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DMASKTRIG2 = 0x2;
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pcm_play_dma_status_callback(PCM_DMAST_STARTED);
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}
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