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 void *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     /* Set this as a FIQ */
  65     IO_INTC_FISEL0 |= 1 << 11;
  66
  67     IO_DSPC_HPIB_CONTROL = 1 << 10 | 1 << 9 | 1 << 8 | 1 << 7 | 1 << 3 | 1 << 0;
  68
  69     dsp_reset();
  70     dsp_load(dsp_image);
  71     dsp_wake();
  72 }
  73
  74 void pcm_dma_apply_settings(void)
  75 {
  76     audiohw_set_frequency(pcm_fsel);
  77 }
  78
  79 /* Note that size is actually limited to the size of a short right now due to
  80  *  the implementation on the DSP side (and the way that we access it)
  81  */
  82 void pcm_play_dma_start(const void *addr, size_t size)
  83 {
  84     unsigned long sdem_addr=(unsigned long)addr - CONFIG_SDRAM_START;
  85     /* Initialize codec. */
  86     DSP_(_sdem_addrl) = sdem_addr & 0xffff;
  87     DSP_(_sdem_addrh) = sdem_addr >> 16;
  88     DSP_(_sdem_dsp_size) = size;
  89     DSP_(_dma0_stopped)=0;
  90
  91     dsp_wake();
  92 }
  93
  94 void pcm_play_dma_stop(void)
  95 {
  96     DSP_(_dma0_stopped)=1;
  97     dsp_wake();
  98 }
  99
 100 void pcm_play_lock(void)
 101 {
 102
 103 }
 104
 105 void pcm_play_unlock(void)
 106 {
 107
 108 }
 109
 110 void pcm_play_dma_pause(bool pause)
 111 {
 112     if (pause)
 113     {
 114         DSP_(_dma0_stopped)=2;
 115         dsp_wake();
 116     }
 117     else
 118     {
 119         DSP_(_dma0_stopped)=0;
 120         dsp_wake();
 121     }
 122 }
 123
 124 size_t pcm_get_bytes_waiting(void)
 125 {
 126     return DSP_(_sdem_dsp_size)-DSP_(_sdem_level);
 127 }
 128
 129 /* Only used when debugging */
 130 static char buffer[80];
 131
 132 void DSPHINT(void) __attribute__ ((section(".icode")));
 133 void DSPHINT(void)
 134 {
 135     unsigned int i;
 136
 137     IO_INTC_FIQ0 = 1 << 11;
 138
 139     switch (dsp_message.msg)
 140     {
 141     case MSG_DEBUGF:
 142         /* DSP stores one character per word. */
 143         for (i = 0; i < sizeof(buffer); i++)
 144         {
 145             buffer[i] = dsp_message.payload.debugf.buffer[i];
 146         }
 147
 148         DEBUGF("DSP: %s", buffer);
 149         break;
 150
 151     case MSG_REFILL:
 152         /* Buffer empty.  Try to get more. */
 153         pcm_play_get_more_callback(&start, &size);
 154
 155         if (size != 0)
 156         {
 157             unsigned long sdem_addr=(unsigned long)start - CONFIG_SDRAM_START;
 158             /* Flush any pending cache writes */
 159             clean_dcache_range(start, size);
 160
 161             /* set the new DMA values */
 162             DSP_(_sdem_addrl) = sdem_addr & 0xffff;
 163             DSP_(_sdem_addrh) = sdem_addr >> 16;
 164             DSP_(_sdem_dsp_size) = size;
 165
 166             DEBUGF("pcm_sdram at 0x%08lx, sdem_addr 0x%08lx",
 167                 (unsigned long)start, (unsigned long)sdem_addr);
 168         }
 169
 170         break;
 171     default:
 172         DEBUGF("DSP: unknown msg 0x%04x", dsp_message.msg);
 173         break;
 174     }
 175
 176     /* Re-Activate the channel */
 177     dsp_wake();
 178
 179     DEBUGF("DSP: %s", buffer);
 180 }
 181