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![Rajeshwari Shinde](/assets/img/avatar_default.png)
This patch adds driver for I2S interface specific to samsung. Signed-off-by: R. Chandrasekar <rcsekar@samsung.com> Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com> Acked-by: Simon Glass <sjg@chromium.org> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
229 lines
5.3 KiB
C
229 lines
5.3 KiB
C
/*
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* Copyright (C) 2012 Samsung Electronics
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* R. Chandrasekar <rcsekar@samsung.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <malloc.h>
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#include <common.h>
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#include <asm/io.h>
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#include <i2c.h>
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#include <i2s.h>
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#include <sound.h>
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#include "wm8994.h"
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#include <asm/arch/sound.h>
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/* defines */
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#define SOUND_400_HZ 400
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#define SOUND_BITS_IN_BYTE 8
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static struct i2stx_info g_i2stx_pri;
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static struct sound_codec_info g_codec_info;
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/*
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* get_sound_fdt_values gets fdt values for i2s parameters
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*
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* @param i2stx_info i2s transmitter transfer param structure
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* @param blob FDT blob
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*/
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static void get_sound_i2s_values(struct i2stx_info *i2s)
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{
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i2s->base_address = samsung_get_base_i2s();
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i2s->audio_pll_clk = I2S_PLL_CLK;
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i2s->samplingrate = I2S_SAMPLING_RATE;
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i2s->bitspersample = I2S_BITS_PER_SAMPLE;
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i2s->channels = I2S_CHANNELS;
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i2s->rfs = I2S_RFS;
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i2s->bfs = I2S_BFS;
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}
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/*
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* Gets fdt values for wm8994 config parameters
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*
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* @param pcodec_info codec information structure
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* @param blob FDT blob
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* @return int value, 0 for success
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*/
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static int get_sound_wm8994_values(struct sound_codec_info *pcodec_info)
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{
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int error = 0;
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switch (AUDIO_COMPAT) {
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case AUDIO_COMPAT_SPI:
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debug("%s: Support not added for SPI interface\n", __func__);
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return -1;
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break;
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case AUDIO_COMPAT_I2C:
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pcodec_info->i2c_bus = AUDIO_I2C_BUS;
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pcodec_info->i2c_dev_addr = AUDIO_I2C_REG;
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debug("i2c dev addr = %d\n", pcodec_info->i2c_dev_addr);
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break;
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default:
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debug("%s: Unknown compat id %d\n", __func__, AUDIO_COMPAT);
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return -1;
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}
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if (error == -1) {
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debug("fail to get wm8994 codec node properties\n");
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return -1;
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}
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return 0;
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}
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/*
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* Gets fdt values for codec config parameters
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*
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* @param pcodec_info codec information structure
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* @param blob FDT blob
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* @return int value, 0 for success
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*/
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static int get_sound_codec_values(struct sound_codec_info *pcodec_info)
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{
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int error = 0;
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const char *codectype;
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codectype = AUDIO_CODEC;
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if (!strcmp(codectype, "wm8994")) {
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pcodec_info->codec_type = CODEC_WM_8994;
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error = get_sound_wm8994_values(pcodec_info);
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} else {
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error = -1;
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}
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if (error == -1) {
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debug("fail to get sound codec node properties\n");
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return -1;
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}
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return 0;
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}
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int sound_init(void)
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{
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int ret;
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struct i2stx_info *pi2s_tx = &g_i2stx_pri;
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struct sound_codec_info *pcodec_info = &g_codec_info;
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/* Get the I2S Values */
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get_sound_i2s_values(pi2s_tx);
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/* Get the codec Values */
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if (get_sound_codec_values(pcodec_info) < 0)
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return -1;
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ret = i2s_tx_init(pi2s_tx);
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if (ret) {
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debug("%s: Failed to init i2c transmit: ret=%d\n", __func__,
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ret);
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return ret;
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}
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/* Check the codec type and initialise the same */
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if (pcodec_info->codec_type == CODEC_WM_8994) {
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ret = wm8994_init(pcodec_info, WM8994_AIF2,
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pi2s_tx->samplingrate,
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(pi2s_tx->samplingrate * (pi2s_tx->rfs)),
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pi2s_tx->bitspersample, pi2s_tx->channels);
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} else {
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debug("%s: Unknown code type %d\n", __func__,
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pcodec_info->codec_type);
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return -1;
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}
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if (ret) {
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debug("%s: Codec init failed\n", __func__);
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return -1;
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}
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return ret;
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}
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/*
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* Generates square wave sound data for 1 second
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*
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* @param data data buffer pointer
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* @param size size of the buffer
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* @param freq frequency of the wave
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*/
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static void sound_prepare_buffer(unsigned short *data, int size, uint32_t freq)
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{
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const int sample = 48000;
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const unsigned short amplitude = 16000; /* between 1 and 32767 */
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const int period = freq ? sample / freq : 0;
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const int half = period / 2;
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assert(freq);
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/* Make sure we don't overflow our buffer */
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if (size % 2)
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size--;
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while (size) {
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int i;
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for (i = 0; size && i < half; i++) {
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size -= 2;
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*data++ = amplitude;
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*data++ = amplitude;
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}
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for (i = 0; size && i < period - half; i++) {
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size -= 2;
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*data++ = -amplitude;
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*data++ = -amplitude;
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}
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}
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}
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int sound_play(uint32_t msec, uint32_t frequency)
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{
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unsigned int *data;
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unsigned long data_size;
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unsigned int ret = 0;
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/*Buffer length computation */
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data_size = g_i2stx_pri.samplingrate * g_i2stx_pri.channels;
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data_size *= (g_i2stx_pri.bitspersample / SOUND_BITS_IN_BYTE);
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data = malloc(data_size);
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if (data == NULL) {
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debug("%s: malloc failed\n", __func__);
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return -1;
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}
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sound_prepare_buffer((unsigned short *)data,
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data_size / sizeof(unsigned short), frequency);
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while (msec >= 1000) {
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ret = i2s_transfer_tx_data(&g_i2stx_pri, data,
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(data_size / sizeof(int)));
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msec -= 1000;
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}
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if (msec) {
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unsigned long size =
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(data_size * msec) / (sizeof(int) * 1000);
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ret = i2s_transfer_tx_data(&g_i2stx_pri, data, size);
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}
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free(data);
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return ret;
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}
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