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 = fdtdec_next_compatible(blob, 0,
40 COMPAT_SAMSUNG_EXYNOS5_SOUND);
42 debug("EXYNOS_SOUND: No node for sound in device tree\n");
47 * Get the pre-defined sound specific values from FDT.
48 * All of these are expected to be correct otherwise
49 * wrong register values in i2s setup parameters
50 * may result in no sound play.
52 base = fdtdec_get_addr(blob, node, "reg");
53 if (base == FDT_ADDR_T_NONE) {
54 debug("%s: Missing i2s base\n", __func__);
57 i2s->base_address = base;
59 i2s->audio_pll_clk = fdtdec_get_int(blob,
60 node, "samsung,i2s-epll-clock-frequency", -1);
61 error |= i2s->audio_pll_clk;
62 debug("audio_pll_clk = %d\n", i2s->audio_pll_clk);
63 i2s->samplingrate = fdtdec_get_int(blob,
64 node, "samsung,i2s-sampling-rate", -1);
65 error |= i2s->samplingrate;
66 debug("samplingrate = %d\n", i2s->samplingrate);
67 i2s->bitspersample = fdtdec_get_int(blob,
68 node, "samsung,i2s-bits-per-sample", -1);
69 error |= i2s->bitspersample;
70 debug("bitspersample = %d\n", i2s->bitspersample);
71 i2s->channels = fdtdec_get_int(blob,
72 node, "samsung,i2s-channels", -1);
73 error |= i2s->channels;
74 debug("channels = %d\n", i2s->channels);
75 i2s->rfs = fdtdec_get_int(blob,
76 node, "samsung,i2s-lr-clk-framesize", -1);
78 debug("rfs = %d\n", i2s->rfs);
79 i2s->bfs = fdtdec_get_int(blob,
80 node, "samsung,i2s-bit-clk-framesize", -1);
82 debug("bfs = %d\n", i2s->bfs);
84 debug("fail to get sound i2s node properties\n");
88 i2s->base_address = samsung_get_base_i2s();
89 i2s->audio_pll_clk = I2S_PLL_CLK;
90 i2s->samplingrate = I2S_SAMPLING_RATE;
91 i2s->bitspersample = I2S_BITS_PER_SAMPLE;
92 i2s->channels = I2S_CHANNELS;
102 * @param blob FDT blob
103 * @param pi2s_tx i2s parameters required by codec
104 * @return int value, 0 for success
106 static int codec_init(const void *blob, struct i2stx_info *pi2s_tx)
109 const char *codectype;
110 #ifdef CONFIG_OF_CONTROL
113 /* Get the node from FDT for sound */
114 node = fdtdec_next_compatible(blob, 0, COMPAT_SAMSUNG_EXYNOS5_SOUND);
116 debug("EXYNOS_SOUND: No node for sound in device tree\n");
117 debug("node = %d\n", node);
122 * Get the pre-defined sound codec specific values from FDT.
123 * All of these are expected to be correct otherwise sound
126 codectype = fdt_getprop(blob, node, "samsung,codec-type", NULL);
127 debug("device = %s\n", codectype);
129 codectype = AUDIO_CODEC;
131 if (!strcmp(codectype, "wm8994")) {
132 /* Check the codec type and initialise the same */
133 ret = wm8994_init(blob, WM8994_AIF2,
134 pi2s_tx->samplingrate,
135 (pi2s_tx->samplingrate * (pi2s_tx->rfs)),
136 pi2s_tx->bitspersample, pi2s_tx->channels);
137 } else if (!strcmp(codectype, "max98095")) {
138 ret = max98095_init(blob, pi2s_tx->samplingrate,
139 (pi2s_tx->samplingrate * (pi2s_tx->rfs)),
140 pi2s_tx->bitspersample);
142 debug("%s: Unknown codec type %s\n", __func__, codectype);
147 debug("%s: Codec init failed\n", __func__);
154 int sound_init(const void *blob)
157 struct i2stx_info *pi2s_tx = &g_i2stx_pri;
159 /* Get the I2S Values */
160 if (get_sound_i2s_values(pi2s_tx, blob) < 0) {
161 debug(" FDT I2S values failed\n");
165 if (codec_init(blob, pi2s_tx) < 0) {
166 debug(" Codec init failed\n");
170 ret = i2s_tx_init(pi2s_tx);
172 debug("%s: Failed to init i2c transmit: ret=%d\n", __func__,
182 * Generates square wave sound data for 1 second
184 * @param data data buffer pointer
185 * @param size size of the buffer
186 * @param freq frequency of the wave
188 static void sound_prepare_buffer(unsigned short *data, int size, uint32_t freq)
190 const int sample = 48000;
191 const unsigned short amplitude = 16000; /* between 1 and 32767 */
192 const int period = freq ? sample / freq : 0;
193 const int half = period / 2;
197 /* Make sure we don't overflow our buffer */
203 for (i = 0; size && i < half; i++) {
208 for (i = 0; size && i < period - half; i++) {
210 *data++ = -amplitude;
211 *data++ = -amplitude;
216 int sound_play(uint32_t msec, uint32_t frequency)
219 unsigned long data_size;
220 unsigned int ret = 0;
222 /*Buffer length computation */
223 data_size = g_i2stx_pri.samplingrate * g_i2stx_pri.channels;
224 data_size *= (g_i2stx_pri.bitspersample / SOUND_BITS_IN_BYTE);
225 data = malloc(data_size);
228 debug("%s: malloc failed\n", __func__);
232 sound_prepare_buffer((unsigned short *)data,
233 data_size / sizeof(unsigned short), frequency);
235 while (msec >= 1000) {
236 ret = i2s_transfer_tx_data(&g_i2stx_pri, data,
237 (data_size / sizeof(int)));
242 (data_size * msec) / (sizeof(int) * 1000);
244 ret = i2s_transfer_tx_data(&g_i2stx_pri, data, size);