drivers/sound/sound.c

   1 /*
   2  * Copyright (C) 2012 Samsung Electronics
   3  * R. Chandrasekar <rcsekar@samsung.com>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <malloc.h>
  25 #include <common.h>
  26 #include <asm/io.h>
  27 #include <libfdt.h>
  28 #include <fdtdec.h>
  29 #include <i2c.h>
  30 #include <i2s.h>
  31 #include <sound.h>
  32 #include <asm/arch/sound.h>
  33 #include "wm8994.h"
  34 #include "max98095.h"
  35
  36 /* defines */
  37 #define SOUND_400_HZ 400
  38 #define SOUND_BITS_IN_BYTE 8
  39
  40 static struct i2stx_info g_i2stx_pri;
  41
  42 /*
  43  * get_sound_i2s_values gets values for i2s parameters
  44  *
  45  * @param i2stx_info    i2s transmitter transfer param structure
  46  * @param blob          FDT blob if enabled else NULL
  47  */
  48 static int get_sound_i2s_values(struct i2stx_info *i2s, const void *blob)
  49 {
  50 #ifdef CONFIG_OF_CONTROL
  51         int node;
  52         int error = 0;
  53         int base;
  54
  55         node = fdtdec_next_compatible(blob, 0,
  56                                         COMPAT_SAMSUNG_EXYNOS5_SOUND);
  57         if (node <= 0) {
  58                 debug("EXYNOS_SOUND: No node for sound in device tree\n");
  59                 return -1;
  60         }
  61
  62         /*
  63          * Get the pre-defined sound specific values from FDT.
  64          * All of these are expected to be correct otherwise
  65          * wrong register values in i2s setup parameters
  66          * may result in no sound play.
  67          */
  68         base = fdtdec_get_addr(blob, node, "reg");
  69         if (base == FDT_ADDR_T_NONE) {
  70                 debug("%s: Missing  i2s base\n", __func__);
  71                 return -1;
  72         }
  73         i2s->base_address = base;
  74
  75         i2s->audio_pll_clk = fdtdec_get_int(blob,
  76                                 node, "samsung,i2s-epll-clock-frequency", -1);
  77         error |= i2s->audio_pll_clk;
  78         debug("audio_pll_clk = %d\n", i2s->audio_pll_clk);
  79         i2s->samplingrate = fdtdec_get_int(blob,
  80                                 node, "samsung,i2s-sampling-rate", -1);
  81         error |= i2s->samplingrate;
  82         debug("samplingrate = %d\n", i2s->samplingrate);
  83         i2s->bitspersample = fdtdec_get_int(blob,
  84                                 node, "samsung,i2s-bits-per-sample", -1);
  85         error |= i2s->bitspersample;
  86         debug("bitspersample = %d\n", i2s->bitspersample);
  87         i2s->channels = fdtdec_get_int(blob,
  88                         node, "samsung,i2s-channels", -1);
  89         error |= i2s->channels;
  90         debug("channels = %d\n", i2s->channels);
  91         i2s->rfs = fdtdec_get_int(blob,
  92                                 node, "samsung,i2s-lr-clk-framesize", -1);
  93         error |= i2s->rfs;
  94         debug("rfs = %d\n", i2s->rfs);
  95         i2s->bfs = fdtdec_get_int(blob,
  96                                 node, "samsung,i2s-bit-clk-framesize", -1);
  97         error |= i2s->bfs;
  98         debug("bfs = %d\n", i2s->bfs);
  99         if (error == -1) {
 100                 debug("fail to get sound i2s node properties\n");
 101                 return -1;
 102         }
 103 #else
 104         i2s->base_address = samsung_get_base_i2s();
 105         i2s->audio_pll_clk = I2S_PLL_CLK;
 106         i2s->samplingrate = I2S_SAMPLING_RATE;
 107         i2s->bitspersample = I2S_BITS_PER_SAMPLE;
 108         i2s->channels = I2S_CHANNELS;
 109         i2s->rfs = I2S_RFS;
 110         i2s->bfs = I2S_BFS;
 111 #endif
 112         return 0;
 113 }
 114
 115 /*
 116  * Init codec
 117  *
 118  * @param blob          FDT blob
 119  * @param pi2s_tx       i2s parameters required by codec
 120  * @return              int value, 0 for success
 121  */
 122 static int codec_init(const void *blob, struct i2stx_info *pi2s_tx)
 123 {
 124         int ret;
 125         const char *codectype;
 126 #ifdef CONFIG_OF_CONTROL
 127         int node;
 128
 129         /* Get the node from FDT for sound */
 130         node = fdtdec_next_compatible(blob, 0, COMPAT_SAMSUNG_EXYNOS5_SOUND);
 131         if (node <= 0) {
 132                 debug("EXYNOS_SOUND: No node for sound in device tree\n");
 133                 debug("node = %d\n", node);
 134                 return -1;
 135         }
 136
 137         /*
 138          * Get the pre-defined sound codec specific values from FDT.
 139          * All of these are expected to be correct otherwise sound
 140          * can not be played
 141          */
 142         codectype = fdt_getprop(blob, node, "samsung,codec-type", NULL);
 143         debug("device = %s\n", codectype);
 144 #else
 145         codectype =  AUDIO_CODEC;
 146 #endif
 147         if (!strcmp(codectype, "wm8994")) {
 148                 /* Check the codec type and initialise the same */
 149                 ret = wm8994_init(blob, WM8994_AIF2,
 150                         pi2s_tx->samplingrate,
 151                         (pi2s_tx->samplingrate * (pi2s_tx->rfs)),
 152                         pi2s_tx->bitspersample, pi2s_tx->channels);
 153         } else if (!strcmp(codectype, "max98095")) {
 154                 ret = max98095_init(blob, pi2s_tx->samplingrate,
 155                                 (pi2s_tx->samplingrate * (pi2s_tx->rfs)),
 156                                 pi2s_tx->bitspersample);
 157         } else {
 158                 debug("%s: Unknown codec type %s\n", __func__, codectype);
 159                 return -1;
 160         }
 161
 162         if (ret) {
 163                 debug("%s: Codec init failed\n", __func__);
 164                 return -1;
 165         }
 166
 167         return 0;
 168 }
 169
 170 int sound_init(const void *blob)
 171 {
 172         int ret;
 173         struct i2stx_info *pi2s_tx = &g_i2stx_pri;
 174
 175         /* Get the I2S Values */
 176         if (get_sound_i2s_values(pi2s_tx, blob) < 0) {
 177                 debug(" FDT I2S values failed\n");
 178                 return -1;
 179         }
 180
 181         if (codec_init(blob, pi2s_tx) < 0) {
 182                 debug(" Codec init failed\n");
 183                 return -1;
 184         }
 185
 186         ret = i2s_tx_init(pi2s_tx);
 187         if (ret) {
 188                 debug("%s: Failed to init i2c transmit: ret=%d\n", __func__,
 189                       ret);
 190                 return ret;
 191         }
 192
 193
 194         return ret;
 195 }
 196
 197 /*
 198  * Generates square wave sound data for 1 second
 199  *
 200  * @param data          data buffer pointer
 201  * @param size          size of the buffer
 202  * @param freq          frequency of the wave
 203  */
 204 static void sound_prepare_buffer(unsigned short *data, int size, uint32_t freq)
 205 {
 206         const int sample = 48000;
 207         const unsigned short amplitude = 16000; /* between 1 and 32767 */
 208         const int period = freq ? sample / freq : 0;
 209         const int half = period / 2;
 210
 211         assert(freq);
 212
 213         /* Make sure we don't overflow our buffer */
 214         if (size % 2)
 215                 size--;
 216
 217         while (size) {
 218                 int i;
 219                 for (i = 0; size && i < half; i++) {
 220                         size -= 2;
 221                         *data++ = amplitude;
 222                         *data++ = amplitude;
 223                 }
 224                 for (i = 0; size && i < period - half; i++) {
 225                         size -= 2;
 226                         *data++ = -amplitude;
 227                         *data++ = -amplitude;
 228                 }
 229         }
 230 }
 231
 232 int sound_play(uint32_t msec, uint32_t frequency)
 233 {
 234         unsigned int *data;
 235         unsigned long data_size;
 236         unsigned int ret = 0;
 237
 238         /*Buffer length computation */
 239         data_size = g_i2stx_pri.samplingrate * g_i2stx_pri.channels;
 240         data_size *= (g_i2stx_pri.bitspersample / SOUND_BITS_IN_BYTE);
 241         data = malloc(data_size);
 242
 243         if (data == NULL) {
 244                 debug("%s: malloc failed\n", __func__);
 245                 return -1;
 246         }
 247
 248         sound_prepare_buffer((unsigned short *)data,
 249                                 data_size / sizeof(unsigned short), frequency);
 250
 251         while (msec >= 1000) {
 252                 ret = i2s_transfer_tx_data(&g_i2stx_pri, data,
 253                                            (data_size / sizeof(int)));
 254                 msec -= 1000;
 255         }
 256         if (msec) {
 257                 unsigned long size =
 258                         (data_size * msec) / (sizeof(int) * 1000);
 259
 260                 ret = i2s_transfer_tx_data(&g_i2stx_pri, data, size);
 261         }
 262
 263         free(data);
 264
 265         return ret;
 266 }