ASoC: sirf: Add SiRF audio port driver is used by SiRF internal audio codec

This driver is used by SIRF internal audio codec.
Use dedicated SiRF audio port TXFIFO and RXFIFO
Supports two DMA channels for SiRF audio port TXFIFO and RXFIFO
The audio port like as audio bus such as i2s.

Signed-off-by: Rongjun Ying <rongjun.ying@csr.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 194 insertions, 0 deletions

diff --git a/sound/soc/sirf/sirf-audio-port.c b/sound/soc/sirf/sirf-audio-port.c
new file mode 100644
index 000000000000..b04a53f2b4f6
--- /dev/null
+++ b/sound/soc/sirf/sirf-audio-port.c
@@ -0,0 +1,194 @@
+/*
+ * SiRF Audio port driver
+ *
+ * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Licensed under GPLv2 or later.
+ */
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/regmap.h>
+#include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
+
+#include "sirf-audio-port.h"
+
+struct sirf_audio_port {
+        struct regmap *regmap;
+        struct snd_dmaengine_dai_dma_data playback_dma_data;
+        struct snd_dmaengine_dai_dma_data capture_dma_data;
+};
+
+static void sirf_audio_port_tx_enable(struct sirf_audio_port *port)
+{
+        regmap_update_bits(port->regmap, AUDIO_PORT_IC_TXFIFO_OP,
+                AUDIO_FIFO_RESET, AUDIO_FIFO_RESET);
+        regmap_write(port->regmap, AUDIO_PORT_IC_TXFIFO_INT_MSK, 0);
+        regmap_write(port->regmap, AUDIO_PORT_IC_TXFIFO_OP, 0);
+        regmap_update_bits(port->regmap, AUDIO_PORT_IC_TXFIFO_OP,
+                AUDIO_FIFO_START, AUDIO_FIFO_START);
+        regmap_update_bits(port->regmap, AUDIO_PORT_IC_CODEC_TX_CTRL,
+                IC_TX_ENABLE, IC_TX_ENABLE);
+}
+
+static void sirf_audio_port_tx_disable(struct sirf_audio_port *port)
+{
+        regmap_write(port->regmap, AUDIO_PORT_IC_TXFIFO_OP, 0);
+        regmap_update_bits(port->regmap, AUDIO_PORT_IC_CODEC_TX_CTRL,
+                IC_TX_ENABLE, ~IC_TX_ENABLE);
+}
+
+static void sirf_audio_port_rx_enable(struct sirf_audio_port *port,
+        int channels)
+{
+        regmap_update_bits(port->regmap, AUDIO_PORT_IC_RXFIFO_OP,
+                AUDIO_FIFO_RESET, AUDIO_FIFO_RESET);
+        regmap_write(port->regmap, AUDIO_PORT_IC_RXFIFO_INT_MSK, 0);
+        regmap_write(port->regmap, AUDIO_PORT_IC_RXFIFO_OP, 0);
+        regmap_update_bits(port->regmap, AUDIO_PORT_IC_RXFIFO_OP,
+                AUDIO_FIFO_START, AUDIO_FIFO_START);
+        if (channels == 1)
+                regmap_update_bits(port->regmap, AUDIO_PORT_IC_CODEC_RX_CTRL,
+                        IC_RX_ENABLE_MONO, IC_RX_ENABLE_MONO);
+        else
+                regmap_update_bits(port->regmap, AUDIO_PORT_IC_CODEC_RX_CTRL,
+                        IC_RX_ENABLE_STEREO, IC_RX_ENABLE_STEREO);
+}
+
+static void sirf_audio_port_rx_disable(struct sirf_audio_port *port)
+{
+        regmap_update_bits(port->regmap, AUDIO_PORT_IC_CODEC_RX_CTRL,
+                        IC_RX_ENABLE_STEREO, ~IC_RX_ENABLE_STEREO);
+}
+
+static int sirf_audio_port_dai_probe(struct snd_soc_dai *dai)
+{
+        struct sirf_audio_port *port = snd_soc_dai_get_drvdata(dai);
+        snd_soc_dai_init_dma_data(dai, &port->playback_dma_data,
+                        &port->capture_dma_data);
+        return 0;
+}
+
+static int sirf_audio_port_trigger(struct snd_pcm_substream *substream, int cmd,
+        struct snd_soc_dai *dai)
+{
+        struct sirf_audio_port *port = snd_soc_dai_get_drvdata(dai);
+        int playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                if (playback)
+                        sirf_audio_port_tx_disable(port);
+                else
+                        sirf_audio_port_rx_disable(port);
+                break;
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                if (playback)
+                        sirf_audio_port_tx_enable(port);
+                else
+                        sirf_audio_port_rx_enable(port,
+                                substream->runtime->channels);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static const struct snd_soc_dai_ops sirf_audio_port_dai_ops = {
+        .trigger = sirf_audio_port_trigger,
+};
+
+static struct snd_soc_dai_driver sirf_audio_port_dai = {
+        .probe = sirf_audio_port_dai_probe,
+        .name = "sirf-audio-port",
+        .id = 0,
+        .playback = {
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = SNDRV_PCM_RATE_48000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,
+        },
+        .capture = {
+                .channels_min = 1,
+                .channels_max = 2,
+                .rates = SNDRV_PCM_RATE_48000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,
+        },
+        .ops = &sirf_audio_port_dai_ops,
+};
+
+static const struct snd_soc_component_driver sirf_audio_port_component = {
+        .name       = "sirf-audio-port",
+};
+
+static const struct regmap_config sirf_audio_port_regmap_config = {
+        .reg_bits = 32,
+        .reg_stride = 4,
+        .val_bits = 32,
+        .max_register = AUDIO_PORT_IC_RXFIFO_INT_MSK,
+        .cache_type = REGCACHE_NONE,
+};
+
+static int sirf_audio_port_probe(struct platform_device *pdev)
+{
+        int ret;
+        struct sirf_audio_port *port;
+        void __iomem *base;
+        struct resource *mem_res;
+
+        port = devm_kzalloc(&pdev->dev,
+                        sizeof(struct sirf_audio_port), GFP_KERNEL);
+        if (!port)
+                return -ENOMEM;
+
+        mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!mem_res) {
+                dev_err(&pdev->dev, "no mem resource?\n");
+                return -ENODEV;
+        }
+
+        base = devm_ioremap(&pdev->dev, mem_res->start,
+                        resource_size(mem_res));
+        if (base == NULL)
+                return -ENOMEM;
+
+        port->regmap = devm_regmap_init_mmio(&pdev->dev, base,
+                                            &sirf_audio_port_regmap_config);
+        if (IS_ERR(port->regmap))
+                return PTR_ERR(port->regmap);
+
+        ret = devm_snd_soc_register_component(&pdev->dev,
+                        &sirf_audio_port_component, &sirf_audio_port_dai, 1);
+        if (ret)
+                return ret;
+
+        platform_set_drvdata(pdev, port);
+        return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+}
+
+static const struct of_device_id sirf_audio_port_of_match[] = {
+        { .compatible = "sirf,audio-port", },
+        {}
+};
+MODULE_DEVICE_TABLE(of, sirf_audio_port_of_match);
+
+static struct platform_driver sirf_audio_port_driver = {
+        .driver = {
+                .name = "sirf-audio-port",
+                .owner = THIS_MODULE,
+                .of_match_table = sirf_audio_port_of_match,
+        },
+        .probe = sirf_audio_port_probe,
+};
+
+module_platform_driver(sirf_audio_port_driver);
+
+MODULE_DESCRIPTION("SiRF Audio Port driver");
+MODULE_AUTHOR("RongJun Ying <Rongjun.Ying@csr.com>");
+MODULE_LICENSE("GPL v2");