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 35 /* defines */ 36 #define SOUND_400_HZ 400 37 #define SOUND_BITS_IN_BYTE 8 38 39 static struct i2stx_info g_i2stx_pri; 40 41 /* 42 * get_sound_i2s_values gets values for i2s parameters 43 * 44 * @param i2stx_info i2s transmitter transfer param structure 45 * @param blob FDT blob if enabled else NULL 46 */ 47 static int get_sound_i2s_values(struct i2stx_info *i2s, const void *blob) 48 { 49 #ifdef CONFIG_OF_CONTROL 50 int node; 51 int error = 0; 52 int base; 53 54 node = fdtdec_next_compatible(blob, 0, 55 COMPAT_SAMSUNG_EXYNOS5_SOUND); 56 if (node <= 0) { 57 debug("EXYNOS_SOUND: No node for sound in device tree\n"); 58 return -1; 59 } 60 61 /* 62 * Get the pre-defined sound specific values from FDT. 63 * All of these are expected to be correct otherwise 64 * wrong register values in i2s setup parameters 65 * may result in no sound play. 66 */ 67 base = fdtdec_get_addr(blob, node, "reg"); 68 if (base == FDT_ADDR_T_NONE) { 69 debug("%s: Missing i2s base\n", __func__); 70 return -1; 71 } 72 i2s->base_address = base; 73 74 i2s->audio_pll_clk = fdtdec_get_int(blob, 75 node, "samsung,i2s-epll-clock-frequency", -1); 76 error |= i2s->audio_pll_clk; 77 debug("audio_pll_clk = %d\n", i2s->audio_pll_clk); 78 i2s->samplingrate = fdtdec_get_int(blob, 79 node, "samsung,i2s-sampling-rate", -1); 80 error |= i2s->samplingrate; 81 debug("samplingrate = %d\n", i2s->samplingrate); 82 i2s->bitspersample = fdtdec_get_int(blob, 83 node, "samsung,i2s-bits-per-sample", -1); 84 error |= i2s->bitspersample; 85 debug("bitspersample = %d\n", i2s->bitspersample); 86 i2s->channels = fdtdec_get_int(blob, 87 node, "samsung,i2s-channels", -1); 88 error |= i2s->channels; 89 debug("channels = %d\n", i2s->channels); 90 i2s->rfs = fdtdec_get_int(blob, 91 node, "samsung,i2s-lr-clk-framesize", -1); 92 error |= i2s->rfs; 93 debug("rfs = %d\n", i2s->rfs); 94 i2s->bfs = fdtdec_get_int(blob, 95 node, "samsung,i2s-bit-clk-framesize", -1); 96 error |= i2s->bfs; 97 debug("bfs = %d\n", i2s->bfs); 98 if (error == -1) { 99 debug("fail to get sound i2s node properties\n"); 100 return -1; 101 } 102 #else 103 i2s->base_address = samsung_get_base_i2s(); 104 i2s->audio_pll_clk = I2S_PLL_CLK; 105 i2s->samplingrate = I2S_SAMPLING_RATE; 106 i2s->bitspersample = I2S_BITS_PER_SAMPLE; 107 i2s->channels = I2S_CHANNELS; 108 i2s->rfs = I2S_RFS; 109 i2s->bfs = I2S_BFS; 110 #endif 111 return 0; 112 } 113 114 /* 115 * Init codec 116 * 117 * @param blob FDT blob 118 * @param pi2s_tx i2s parameters required by codec 119 * @return int value, 0 for success 120 */ 121 static int codec_init(const void *blob, struct i2stx_info *pi2s_tx) 122 { 123 int ret; 124 const char *codectype; 125 #ifdef CONFIG_OF_CONTROL 126 int node; 127 128 /* Get the node from FDT for sound */ 129 node = fdtdec_next_compatible(blob, 0, COMPAT_SAMSUNG_EXYNOS5_SOUND); 130 if (node <= 0) { 131 debug("EXYNOS_SOUND: No node for sound in device tree\n"); 132 debug("node = %d\n", node); 133 return -1; 134 } 135 136 /* 137 * Get the pre-defined sound codec specific values from FDT. 138 * All of these are expected to be correct otherwise sound 139 * can not be played 140 */ 141 codectype = fdt_getprop(blob, node, "samsung,codec-type", NULL); 142 debug("device = %s\n", codectype); 143 #else 144 codectype = AUDIO_CODEC; 145 #endif 146 if (!strcmp(codectype, "wm8994")) { 147 /* Check the codec type and initialise the same */ 148 ret = wm8994_init(blob, WM8994_AIF2, 149 pi2s_tx->samplingrate, 150 (pi2s_tx->samplingrate * (pi2s_tx->rfs)), 151 pi2s_tx->bitspersample, pi2s_tx->channels); 152 } else { 153 debug("%s: Unknown code type %s\n", __func__, 154 codectype); 155 return -1; 156 } 157 if (ret) { 158 debug("%s: Codec init failed\n", __func__); 159 return -1; 160 } 161 162 return 0; 163 } 164 165 int sound_init(const void *blob) 166 { 167 int ret; 168 struct i2stx_info *pi2s_tx = &g_i2stx_pri; 169 170 /* Get the I2S Values */ 171 if (get_sound_i2s_values(pi2s_tx, blob) < 0) { 172 debug(" FDT I2S values failed\n"); 173 return -1; 174 } 175 176 if (codec_init(blob, pi2s_tx) < 0) { 177 debug(" Codec init failed\n"); 178 return -1; 179 } 180 181 ret = i2s_tx_init(pi2s_tx); 182 if (ret) { 183 debug("%s: Failed to init i2c transmit: ret=%d\n", __func__, 184 ret); 185 return ret; 186 } 187 188 189 return ret; 190 } 191 192 /* 193 * Generates square wave sound data for 1 second 194 * 195 * @param data data buffer pointer 196 * @param size size of the buffer 197 * @param freq frequency of the wave 198 */ 199 static void sound_prepare_buffer(unsigned short *data, int size, uint32_t freq) 200 { 201 const int sample = 48000; 202 const unsigned short amplitude = 16000; /* between 1 and 32767 */ 203 const int period = freq ? sample / freq : 0; 204 const int half = period / 2; 205 206 assert(freq); 207 208 /* Make sure we don't overflow our buffer */ 209 if (size % 2) 210 size--; 211 212 while (size) { 213 int i; 214 for (i = 0; size && i < half; i++) { 215 size -= 2; 216 *data++ = amplitude; 217 *data++ = amplitude; 218 } 219 for (i = 0; size && i < period - half; i++) { 220 size -= 2; 221 *data++ = -amplitude; 222 *data++ = -amplitude; 223 } 224 } 225 } 226 227 int sound_play(uint32_t msec, uint32_t frequency) 228 { 229 unsigned int *data; 230 unsigned long data_size; 231 unsigned int ret = 0; 232 233 /*Buffer length computation */ 234 data_size = g_i2stx_pri.samplingrate * g_i2stx_pri.channels; 235 data_size *= (g_i2stx_pri.bitspersample / SOUND_BITS_IN_BYTE); 236 data = malloc(data_size); 237 238 if (data == NULL) { 239 debug("%s: malloc failed\n", __func__); 240 return -1; 241 } 242 243 sound_prepare_buffer((unsigned short *)data, 244 data_size / sizeof(unsigned short), frequency); 245 246 while (msec >= 1000) { 247 ret = i2s_transfer_tx_data(&g_i2stx_pri, data, 248 (data_size / sizeof(int))); 249 msec -= 1000; 250 } 251 if (msec) { 252 unsigned long size = 253 (data_size * msec) / (sizeof(int) * 1000); 254 255 ret = i2s_transfer_tx_data(&g_i2stx_pri, data, size); 256 } 257 258 free(data); 259 260 return ret; 261 } 262