sound: ASoC: Blackfin: I2S CPU DAI driver

[Additional coding standards fixes by Mark Brown.]

Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

2 files changed, 306 insertions, 0 deletions

diff --git a/sound/soc/blackfin/bf5xx-i2s.c b/sound/soc/blackfin/bf5xx-i2s.c
new file mode 100644
index 000000000000..43a4092eeb89
--- /dev/null
+++ b/sound/soc/blackfin/bf5xx-i2s.c
@@ -0,0 +1,292 @@
+/*
+ * File:         sound/soc/blackfin/bf5xx-i2s.c
+ * Author:       Cliff Cai <Cliff.Cai@analog.com>
+ *
+ * Created:      Tue June 06 2008
+ * Description:  Blackfin I2S CPU DAI driver
+ *
+ * Modified:
+ *               Copyright 2008 Analog Devices Inc.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include <asm/irq.h>
+#include <asm/portmux.h>
+#include <linux/mutex.h>
+#include <linux/gpio.h>
+
+#include "bf5xx-sport.h"
+#include "bf5xx-i2s.h"
+
+struct bf5xx_i2s_port {
+        u16 tcr1;
+        u16 rcr1;
+        u16 tcr2;
+        u16 rcr2;
+        int counter;
+};
+
+static struct bf5xx_i2s_port bf5xx_i2s;
+static int sport_num = CONFIG_SND_BF5XX_SPORT_NUM;
+
+static struct sport_param sport_params[2] = {
+        {
+                .dma_rx_chan    = CH_SPORT0_RX,
+                .dma_tx_chan    = CH_SPORT0_TX,
+                .err_irq        = IRQ_SPORT0_ERROR,
+                .regs           = (struct sport_register *)SPORT0_TCR1,
+        },
+        {
+                .dma_rx_chan    = CH_SPORT1_RX,
+                .dma_tx_chan    = CH_SPORT1_TX,
+                .err_irq        = IRQ_SPORT1_ERROR,
+                .regs           = (struct sport_register *)SPORT1_TCR1,
+        }
+};
+
+static int bf5xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
+                unsigned int fmt)
+{
+        int ret = 0;
+
+        /* interface format:support I2S,slave mode */
+        switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+        case SND_SOC_DAIFMT_I2S:
+                break;
+        case SND_SOC_DAIFMT_LEFT_J:
+                ret = -EINVAL;
+                break;
+        default:
+                ret = -EINVAL;
+                break;
+        }
+
+        switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+        case SND_SOC_DAIFMT_CBS_CFS:
+                ret = -EINVAL;
+                break;
+        case SND_SOC_DAIFMT_CBM_CFS:
+                ret = -EINVAL;
+                break;
+        case SND_SOC_DAIFMT_CBM_CFM:
+                break;
+        case SND_SOC_DAIFMT_CBS_CFM:
+                ret = -EINVAL;
+                break;
+        default:
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+static int bf5xx_i2s_startup(struct snd_pcm_substream *substream)
+{
+        pr_debug("%s enter\n", __func__);
+
+        /*this counter is used for counting how many pcm streams are opened*/
+        bf5xx_i2s.counter++;
+        return 0;
+}
+
+static int bf5xx_i2s_hw_params(struct snd_pcm_substream *substream,
+                                struct snd_pcm_hw_params *params)
+{
+        int ret = 0;
+
+        bf5xx_i2s.tcr2 &= ~0x1f;
+        bf5xx_i2s.rcr2 &= ~0x1f;
+        switch (params_format(params)) {
+        case SNDRV_PCM_FORMAT_S16_LE:
+                bf5xx_i2s.tcr2 |= 15;
+                bf5xx_i2s.rcr2 |= 15;
+                break;
+        case SNDRV_PCM_FORMAT_S24_LE:
+                bf5xx_i2s.tcr2 |= 23;
+                bf5xx_i2s.rcr2 |= 23;
+                break;
+        case SNDRV_PCM_FORMAT_S32_LE:
+                bf5xx_i2s.tcr2 |= 31;
+                bf5xx_i2s.rcr2 |= 31;
+                break;
+        }
+
+        if (bf5xx_i2s.counter == 1) {
+                /*
+                 * TX and RX are not independent,they are enabled at the
+                 * same time, even if only one side is running. So, we
+                 * need to configure both of them at the time when the first
+                 * stream is opened.
+                 *
+                 * CPU DAI format:I2S, slave mode.
+                 */
+                ret = sport_config_rx(sport_handle, RFSR | RCKFE,
+                                      RSFSE|bf5xx_i2s.rcr2, 0, 0);
+                if (ret) {
+                        pr_err("SPORT is busy!\n");
+                        return -EBUSY;
+                }
+
+                ret = sport_config_tx(sport_handle, TFSR | TCKFE,
+                                      TSFSE|bf5xx_i2s.tcr2, 0, 0);
+                if (ret) {
+                        pr_err("SPORT is busy!\n");
+                        return -EBUSY;
+                }
+        }
+
+        return 0;
+}
+
+static void bf5xx_i2s_shutdown(struct snd_pcm_substream *substream)
+{
+        pr_debug("%s enter\n", __func__);
+        bf5xx_i2s.counter--;
+}
+
+static int bf5xx_i2s_probe(struct platform_device *pdev,
+                           struct snd_soc_dai *dai)
+{
+        u16 sport_req[][7] = {
+                { P_SPORT0_DTPRI, P_SPORT0_TSCLK, P_SPORT0_RFS,
+                  P_SPORT0_DRPRI, P_SPORT0_RSCLK, 0},
+                { P_SPORT1_DTPRI, P_SPORT1_TSCLK, P_SPORT1_RFS,
+                  P_SPORT1_DRPRI, P_SPORT1_RSCLK, 0},
+        };
+
+        pr_debug("%s enter\n", __func__);
+        if (peripheral_request_list(&sport_req[sport_num][0], "soc-audio")) {
+                pr_err("Requesting Peripherals failed\n");
+                return -EFAULT;
+        }
+
+        /* request DMA for SPORT */
+        sport_handle = sport_init(&sport_params[sport_num], 4, \
+                        2 * sizeof(u32), NULL);
+        if (!sport_handle) {
+                peripheral_free_list(&sport_req[sport_num][0]);
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int bf5xx_i2s_suspend(struct platform_device *dev,
+                             struct snd_soc_dai *dai)
+{
+        struct sport_device *sport =
+                (struct sport_device *)dai->private_data;
+
+        pr_debug("%s : sport %d\n", __func__, dai->id);
+        if (!dai->active)
+                return 0;
+        if (dai->capture.active)
+                sport_rx_stop(sport);
+        if (dai->playback.active)
+                sport_tx_stop(sport);
+        return 0;
+}
+
+static int bf5xx_i2s_resume(struct platform_device *pdev,
+                            struct snd_soc_dai *dai)
+{
+        int ret;
+        struct sport_device *sport =
+                (struct sport_device *)dai->private_data;
+
+        pr_debug("%s : sport %d\n", __func__, dai->id);
+        if (!dai->active)
+                return 0;
+
+        ret = sport_config_rx(sport_handle, RFSR | RCKFE, RSFSE|0x1f, 0, 0);
+        if (ret) {
+                pr_err("SPORT is busy!\n");
+                return -EBUSY;
+        }
+
+        ret = sport_config_tx(sport_handle, TFSR | TCKFE, TSFSE|0x1f, 0, 0);
+        if (ret) {
+                pr_err("SPORT is busy!\n");
+                return -EBUSY;
+        }
+
+        if (dai->capture.active)
+                sport_rx_start(sport);
+        if (dai->playback.active)
+                sport_tx_start(sport);
+        return 0;
+}
+
+#else
+#define bf5xx_i2s_suspend       NULL
+#define bf5xx_i2s_resume        NULL
+#endif
+
+#define BF5XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
+                SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
+                SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | \
+                SNDRV_PCM_RATE_96000)
+
+#define BF5XX_I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE |\
+        SNDRV_PCM_FMTBIT_S32_LE)
+
+struct snd_soc_dai bf5xx_i2s_dai = {
+        .name = "bf5xx-i2s",
+        .id = 0,
+        .type = SND_SOC_DAI_I2S,
+        .probe = bf5xx_i2s_probe,
+        .suspend = bf5xx_i2s_suspend,
+        .resume = bf5xx_i2s_resume,
+        .playback = {
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = BF5XX_I2S_RATES,
+                .formats = BF5XX_I2S_FORMATS,},
+        .capture = {
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = BF5XX_I2S_RATES,
+                .formats = BF5XX_I2S_FORMATS,},
+        .ops = {
+                .startup   = bf5xx_i2s_startup,
+                .shutdown  = bf5xx_i2s_shutdown,
+                .hw_params = bf5xx_i2s_hw_params,},
+        .dai_ops = {
+                .set_fmt = bf5xx_i2s_set_dai_fmt,
+        },
+};
+EXPORT_SYMBOL_GPL(bf5xx_i2s_dai);
+
+/* Module information */
+MODULE_AUTHOR("Cliff Cai");
+MODULE_DESCRIPTION("I2S driver for ADI Blackfin");
+MODULE_LICENSE("GPL");
+
diff --git a/sound/soc/blackfin/bf5xx-i2s.h b/sound/soc/blackfin/bf5xx-i2s.h
new file mode 100644
index 000000000000..7107d1a0b06b
--- /dev/null
+++ b/sound/soc/blackfin/bf5xx-i2s.h
@@ -0,0 +1,14 @@
+/*
+ * linux/sound/arm/bf5xx-i2s.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _BF5XX_I2S_H
+#define _BF5XX_I2S_H
+
+extern struct snd_soc_dai bf5xx_i2s_dai;
+
+#endif