firmware/target/arm/tms320dm320/mrobe-500/pcm-mr500.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007 and 2009 by Karl Kurbjun
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include <stdlib.h>
  22 #include "system.h"
  23 #include "kernel.h"
  24 #include "logf.h"
  25 #include "audio.h"
  26 #include "sound.h"
  27 #include "file.h"
  28 #include "dsp-target.h"
  29 #include "dsp/ipc.h"
  30 #include "mmu-arm.h"
  31
  32 /* These are global to save some latency when pcm_play_dma_get_peak_buffer is
  33  *  called.
  34  */
  35 static unsigned char *start;
  36 static size_t         size;
  37
  38 void pcm_postinit(void)
  39 {
  40         audiohw_postinit();
  41 }
  42
  43 /* Return the current location in the SDRAM to SARAM transfer along with the
  44  *  number of bytes read in the current buffer (count).  There is latency with
  45  *  this method equivalent to ~ the size of the SARAM buffer since there is
  46  *  another buffer between your ears and this calculation, but this works for
  47  *  key clicks and an approximate peak meter.
  48  */
  49 const void * pcm_play_dma_get_peak_buffer(int *count)
  50 {
  51         int cnt = DSP_(_sdem_level);
  52
  53     unsigned long addr = (unsigned long) start +cnt;
  54
  55     *count = (cnt & 0xFFFFF) >> 1;
  56     return (void *)((addr + 2) & ~3);
  57 }
  58
  59 void pcm_play_dma_init(void)
  60 {
  61     IO_INTC_IRQ0 = 1 << 11;
  62     IO_INTC_EINT0 |= 1 << 11;
  63
  64     IO_DSPC_HPIB_CONTROL = 1 << 10 | 1 << 9 | 1 << 8 | 1 << 7 | 1 << 3 | 1 << 0;
  65
  66     dsp_reset();
  67     dsp_load(dsp_image);
  68     dsp_wake();
  69 }
  70
  71 void pcm_dma_apply_settings(void)
  72 {
  73         audiohw_set_frequency(pcm_fsel);
  74 }
  75
  76 /* Note that size is actually limited to the size of a short right now due to
  77  *  the implementation on the DSP side (and the way that we access it)
  78  */
  79 void pcm_play_dma_start(const void *addr, size_t size)
  80 {
  81         unsigned long sdem_addr=(unsigned long)addr - CONFIG_SDRAM_START;
  82     /* Initialize codec. */
  83     DSP_(_sdem_addrl) = sdem_addr & 0xffff;
  84     DSP_(_sdem_addrh) = sdem_addr >> 16;
  85     DSP_(_sdem_dsp_size) = size;
  86     DSP_(_dma0_stopped)=0;
  87
  88     dsp_wake();
  89 }
  90
  91 void pcm_play_dma_stop(void)
  92 {
  93     DSP_(_dma0_stopped)=1;
  94 }
  95
  96 void pcm_play_lock(void)
  97 {
  98
  99 }
 100
 101 void pcm_play_unlock(void)
 102 {
 103
 104 }
 105
 106 void pcm_play_dma_pause(bool pause)
 107 {
 108     if (pause)
 109     {
 110         DSP_(_dma0_stopped)=2;
 111     }
 112     else
 113     {
 114         DSP_(_dma0_stopped)=0;
 115         dsp_wake();
 116     }
 117 }
 118
 119 size_t pcm_get_bytes_waiting(void)
 120 {
 121     return DSP_(_sdem_dsp_size)-DSP_(_sdem_level);
 122 }
 123
 124 void DSPHINT(void)
 125 {
 126         register pcm_more_callback_type get_more;   /* No stack for this */
 127
 128     unsigned int i;
 129     char buffer[80];
 130
 131     IO_INTC_IRQ0 = 1 << 11;
 132
 133     switch (dsp_message.msg)
 134     {
 135     case MSG_DEBUGF:
 136         /* DSP stores one character per word. */
 137         for (i = 0; i < sizeof(buffer); i++)
 138         {
 139             buffer[i] = dsp_message.payload.debugf.buffer[i];
 140         }
 141
 142         DEBUGF("DSP: %s", buffer);
 143         break;
 144
 145     case MSG_REFILL:
 146                 /* Buffer empty.  Try to get more. */
 147                 get_more = pcm_callback_for_more;
 148                 size = 0;
 149
 150                 if (get_more == NULL || (get_more(&start, &size), size == 0))
 151                 {
 152                         /* Callback missing or no more DMA to do */
 153                         pcm_play_dma_stop();
 154                         pcm_play_dma_stopped_callback();
 155                 }
 156
 157                 {
 158                         unsigned long sdem_addr=(unsigned long)start - CONFIG_SDRAM_START;
 159                         /* Flush any pending cache writes */
 160                         clean_dcache_range(start, size);
 161
 162                         /* set the new DMA values */
 163                         DSP_(_sdem_addrl) = sdem_addr & 0xffff;
 164                         DSP_(_sdem_addrh) = sdem_addr >> 16;
 165                         DSP_(_sdem_dsp_size) = size;
 166
 167                         DEBUGF("pcm_sdram at 0x%08lx, sdem_addr 0x%08lx",
 168                                 (unsigned long)start, (unsigned long)sdem_addr);
 169                 }
 170
 171                 break;
 172     default:
 173             DEBUGF("DSP: unknown msg 0x%04x", dsp_message.msg);
 174             break;
 175     }
 176
 177     /* Re-Activate the channel */
 178     dsp_wake();
 179
 180     DEBUGF("DSP: %s", buffer);
 181 }
 182