2 * Copyright (C) 2012 Samsung Electronics
3 * R. Chandrasekar <rcsekar@samsung.com>
5 * SPDX-License-Identifier: GPL-2.0+
16 #include <asm/arch/sound.h>
21 #define SOUND_400_HZ 400
22 #define SOUND_BITS_IN_BYTE 8
24 static struct i2stx_info g_i2stx_pri;
27 * get_sound_i2s_values gets values for i2s parameters
29 * @param i2stx_info i2s transmitter transfer param structure
30 * @param blob FDT blob if enabled else NULL
32 static int get_sound_i2s_values(struct i2stx_info *i2s, const void *blob)
34 #ifdef CONFIG_OF_CONTROL
39 node = fdt_path_offset(blob, "i2s");
41 debug("EXYNOS_SOUND: No node for sound in device tree\n");
46 * Get the pre-defined sound specific values from FDT.
47 * All of these are expected to be correct otherwise
48 * wrong register values in i2s setup parameters
49 * may result in no sound play.
51 base = fdtdec_get_addr(blob, node, "reg");
52 if (base == FDT_ADDR_T_NONE) {
53 debug("%s: Missing i2s base\n", __func__);
56 i2s->base_address = base;
58 i2s->audio_pll_clk = fdtdec_get_int(blob,
59 node, "samsung,i2s-epll-clock-frequency", -1);
60 error |= i2s->audio_pll_clk;
61 debug("audio_pll_clk = %d\n", i2s->audio_pll_clk);
62 i2s->samplingrate = fdtdec_get_int(blob,
63 node, "samsung,i2s-sampling-rate", -1);
64 error |= i2s->samplingrate;
65 debug("samplingrate = %d\n", i2s->samplingrate);
66 i2s->bitspersample = fdtdec_get_int(blob,
67 node, "samsung,i2s-bits-per-sample", -1);
68 error |= i2s->bitspersample;
69 debug("bitspersample = %d\n", i2s->bitspersample);
70 i2s->channels = fdtdec_get_int(blob,
71 node, "samsung,i2s-channels", -1);
72 error |= i2s->channels;
73 debug("channels = %d\n", i2s->channels);
74 i2s->rfs = fdtdec_get_int(blob,
75 node, "samsung,i2s-lr-clk-framesize", -1);
77 debug("rfs = %d\n", i2s->rfs);
78 i2s->bfs = fdtdec_get_int(blob,
79 node, "samsung,i2s-bit-clk-framesize", -1);
81 debug("bfs = %d\n", i2s->bfs);
83 i2s->id = fdtdec_get_int(blob, node, "samsung,i2s-id", -1);
85 debug("id = %d\n", i2s->id);
88 debug("fail to get sound i2s node properties\n");
92 i2s->base_address = samsung_get_base_i2s();
93 i2s->audio_pll_clk = I2S_PLL_CLK;
94 i2s->samplingrate = I2S_SAMPLING_RATE;
95 i2s->bitspersample = I2S_BITS_PER_SAMPLE;
96 i2s->channels = I2S_CHANNELS;
107 * @param blob FDT blob
108 * @param pi2s_tx i2s parameters required by codec
109 * @return int value, 0 for success
111 static int codec_init(const void *blob, struct i2stx_info *pi2s_tx)
114 const char *codectype;
115 #ifdef CONFIG_OF_CONTROL
118 /* Get the node from FDT for sound */
119 node = fdtdec_next_compatible(blob, 0, COMPAT_SAMSUNG_EXYNOS5_SOUND);
121 debug("EXYNOS_SOUND: No node for sound in device tree\n");
122 debug("node = %d\n", node);
127 * Get the pre-defined sound codec specific values from FDT.
128 * All of these are expected to be correct otherwise sound
131 codectype = fdt_getprop(blob, node, "samsung,codec-type", NULL);
132 debug("device = %s\n", codectype);
134 codectype = AUDIO_CODEC;
136 if (!strcmp(codectype, "wm8994")) {
137 /* Check the codec type and initialise the same */
138 ret = wm8994_init(blob, pi2s_tx->id + 1,
139 pi2s_tx->samplingrate,
140 (pi2s_tx->samplingrate * (pi2s_tx->rfs)),
141 pi2s_tx->bitspersample, pi2s_tx->channels);
142 } else if (!strcmp(codectype, "max98095")) {
143 ret = max98095_init(blob, pi2s_tx->samplingrate,
144 (pi2s_tx->samplingrate * (pi2s_tx->rfs)),
145 pi2s_tx->bitspersample);
147 debug("%s: Unknown codec type %s\n", __func__, codectype);
152 debug("%s: Codec init failed\n", __func__);
159 int sound_init(const void *blob)
162 struct i2stx_info *pi2s_tx = &g_i2stx_pri;
164 /* Get the I2S Values */
165 if (get_sound_i2s_values(pi2s_tx, blob) < 0) {
166 debug(" FDT I2S values failed\n");
170 if (codec_init(blob, pi2s_tx) < 0) {
171 debug(" Codec init failed\n");
175 ret = i2s_tx_init(pi2s_tx);
177 debug("%s: Failed to init i2c transmit: ret=%d\n", __func__,
187 * Generates square wave sound data for 1 second
189 * @param data data buffer pointer
190 * @param size size of the buffer
191 * @param freq frequency of the wave
193 static void sound_prepare_buffer(unsigned short *data, int size, uint32_t freq)
195 const int sample = 48000;
196 const unsigned short amplitude = 16000; /* between 1 and 32767 */
197 const int period = freq ? sample / freq : 0;
198 const int half = period / 2;
202 /* Make sure we don't overflow our buffer */
208 for (i = 0; size && i < half; i++) {
213 for (i = 0; size && i < period - half; i++) {
215 *data++ = -amplitude;
216 *data++ = -amplitude;
221 int sound_play(uint32_t msec, uint32_t frequency)
224 unsigned long data_size;
225 unsigned int ret = 0;
227 /*Buffer length computation */
228 data_size = g_i2stx_pri.samplingrate * g_i2stx_pri.channels;
229 data_size *= (g_i2stx_pri.bitspersample / SOUND_BITS_IN_BYTE);
230 data = malloc(data_size);
233 debug("%s: malloc failed\n", __func__);
237 sound_prepare_buffer((unsigned short *)data,
238 data_size / sizeof(unsigned short), frequency);
240 while (msec >= 1000) {
241 ret = i2s_transfer_tx_data(&g_i2stx_pri, data,
242 (data_size / sizeof(int)));
247 (data_size * msec) / (sizeof(int) * 1000);
249 ret = i2s_transfer_tx_data(&g_i2stx_pri, data, size);