firmware/target/arm/as3525/pcm-as3525.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright © 2008 Rafaël Carré
  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 "system.h"
  22 #include "audio.h"
  23 #include "string.h"
  24 #include "as3525.h"
  25 #include "pl081.h"
  26 #include "dma-target.h"
  27 #include "clock-target.h"
  28 #include "panic.h"
  29 #include "as3514.h"
  30 #include "audiohw.h"
  31 #include "mmu-arm.h"
  32
  33 #define MAX_TRANSFER (4*((1<<11)-1)) /* maximum data we can transfer via DMA
  34                                       * i.e. 32 bits at once (size of I2SO_DATA)
  35                                       * and the number of 32bits words has to
  36                                       * fit in 11 bits of DMA register */
  37
  38 static unsigned char *dma_start_addr;
  39 static size_t      dma_size;   /* in 4*32 bits */
  40 static void dma_callback(void);
  41 static int locked = 0;
  42
  43 /* Mask the DMA interrupt */
  44 void pcm_play_lock(void)
  45 {
  46     if(++locked == 1)
  47         VIC_INT_EN_CLEAR = INTERRUPT_DMAC;
  48 }
  49
  50 /* Unmask the DMA interrupt if enabled */
  51 void pcm_play_unlock(void)
  52 {
  53     if(--locked == 0)
  54         VIC_INT_ENABLE |= INTERRUPT_DMAC;
  55 }
  56
  57 static void play_start_pcm(void)
  58 {
  59     const unsigned char* addr = dma_start_addr;
  60     size_t size = dma_size;
  61     if(size > MAX_TRANSFER)
  62         size = MAX_TRANSFER;
  63
  64     if((unsigned int)dma_start_addr & 3)
  65         panicf("unaligned pointer!");
  66
  67     dma_size -= size;
  68     dma_start_addr += size;
  69
  70     CGU_PERI |= CGU_I2SOUT_APB_CLOCK_ENABLE;
  71     CGU_AUDIO |= (1<<11);
  72
  73     clean_dcache_range((void*)addr, size);  /* force write back */
  74     dma_enable_channel(1, (void*)addr, (void*)I2SOUT_DATA, DMA_PERI_I2SOUT,
  75                 DMAC_FLOWCTRL_DMAC_MEM_TO_PERI, true, false, size >> 2, DMA_S1,
  76                 dma_callback);
  77 }
  78
  79 static void dma_callback(void)
  80 {
  81     if(!dma_size)
  82     {
  83         register pcm_more_callback_type get_more = pcm_callback_for_more;
  84         if(get_more)
  85             get_more(&dma_start_addr, &dma_size);
  86     }
  87
  88     if(!dma_size)
  89     {
  90         pcm_play_dma_stop();
  91         pcm_play_dma_stopped_callback();
  92     }
  93     else
  94         play_start_pcm();
  95 }
  96
  97 void pcm_play_dma_start(const void *addr, size_t size)
  98 {
  99     dma_size = size;
 100     dma_start_addr = (unsigned char*)addr;
 101
 102     dma_retain();
 103
 104     play_start_pcm();
 105 }
 106
 107 void pcm_play_dma_stop(void)
 108 {
 109     dma_disable_channel(1);
 110     dma_size = 0;
 111
 112     dma_release();
 113
 114     CGU_PERI &= ~CGU_I2SOUT_APB_CLOCK_ENABLE;
 115     CGU_AUDIO &= ~(1<<11);
 116 }
 117
 118 void pcm_play_dma_pause(bool pause)
 119 {
 120     if(pause)
 121         dma_disable_channel(1);
 122     else
 123         play_start_pcm();
 124 }
 125
 126 void pcm_play_dma_init(void)
 127 {
 128     CGU_PERI |= CGU_I2SOUT_APB_CLOCK_ENABLE;
 129
 130     /* clock source PLLA, minimal frequency */
 131     CGU_AUDIO |= (511<<2) | (1<<0);
 132
 133     I2SOUT_CONTROL |= (1<<6) ;  /* enable dma */
 134     I2SOUT_CONTROL |= (1<<3) ;  /* stereo */
 135     I2SOUT_CONTROL &= ~(1<<2);  /* 16 bit samples */
 136
 137     audiohw_preinit();
 138 }
 139
 140 void pcm_postinit(void)
 141 {
 142     audiohw_postinit();
 143 }
 144
 145 void pcm_dma_apply_settings(void)
 146 {
 147     unsigned long frequency = pcm_sampr;
 148
 149     const int divider = (((AS3525_PLLA_FREQ/128) + (frequency/2)) / frequency) - 1;
 150     if(divider < 0 || divider > 511)
 151         panicf("unsupported frequency %ld", frequency);
 152
 153     CGU_AUDIO &= ~(((511 ^ divider) << 2) /* I2SOUT */
 154             /*| ((511 ^ divider) << 14) */ /* I2SIN */
 155             );
 156 }
 157
 158 size_t pcm_get_bytes_waiting(void)
 159 {
 160     return dma_size;
 161 }
 162
 163 const void * pcm_play_dma_get_peak_buffer(int *count)
 164 {
 165     *count = dma_size >> 2;
 166     return (const void*)dma_start_addr;
 167 }
 168
 169 #ifdef HAVE_PCM_DMA_ADDRESS
 170 void * pcm_dma_addr(void *addr)
 171 {
 172     if (addr != NULL)
 173         addr = UNCACHED_ADDR(addr);
 174     return addr;
 175 }
 176 #endif
 177
 178
 179 /****************************************************************************
 180  ** Recording DMA transfer
 181  **/
 182 #ifdef HAVE_RECORDING
 183 void pcm_rec_lock(void)
 184 {
 185 }
 186
 187 void pcm_rec_unlock(void)
 188 {
 189 }
 190
 191 void pcm_record_more(void *start, size_t size)
 192 {
 193     (void)start;
 194     (void)size;
 195 }
 196
 197 void pcm_rec_dma_stop(void)
 198 {
 199 }
 200
 201 void pcm_rec_dma_start(void *addr, size_t size)
 202 {
 203     (void)addr;
 204     (void)size;
 205 }
 206
 207 void pcm_rec_dma_close(void)
 208 {
 209 }
 210
 211
 212 void pcm_rec_dma_init(void)
 213 {
 214 }
 215
 216
 217 const void * pcm_rec_dma_get_peak_buffer(int *count)
 218 {
 219     (void)count;
 220 }
 221
 222 #endif /* HAVE_RECORDING */