ASoC: Ux500: Add platform-driver

Add platform-driver handling all DMA-activities.

Signed-off-by: Ola Lilja <ola.o.lilja@stericsson.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

4 files changed, 363 insertions, 0 deletions

diff --git a/sound/soc/ux500/Kconfig b/sound/soc/ux500/Kconfig
index 44cf43404cd9..1d385150064f 100644
--- a/sound/soc/ux500/Kconfig
+++ b/sound/soc/ux500/Kconfig
@@ -12,3 +12,10 @@ menuconfig SND_SOC_UX500
 config SND_SOC_UX500_PLAT_MSP_I2S
         tristate
         depends on SND_SOC_UX500
+
+config SND_SOC_UX500_PLAT_DMA
+        tristate "Platform - DB8500 (DMA)"
+        depends on SND_SOC_UX500
+        select SND_SOC_DMAENGINE_PCM
+        help
+                Say Y if you want to enable the Ux500 platform-driver.
diff --git a/sound/soc/ux500/Makefile b/sound/soc/ux500/Makefile
index 19974c5a2ea1..4634bf015f62 100644
--- a/sound/soc/ux500/Makefile
+++ b/sound/soc/ux500/Makefile
@@ -2,3 +2,6 @@
 
 snd-soc-ux500-plat-msp-i2s-objs := ux500_msp_dai.o ux500_msp_i2s.o
 obj-$(CONFIG_SND_SOC_UX500_PLAT_MSP_I2S) += snd-soc-ux500-plat-msp-i2s.o
+
+snd-soc-ux500-plat-dma-objs := ux500_pcm.o
+obj-$(CONFIG_SND_SOC_UX500_PLAT_DMA) += snd-soc-ux500-plat-dma.o
diff --git a/sound/soc/ux500/ux500_pcm.c b/sound/soc/ux500/ux500_pcm.c
new file mode 100644
index 000000000000..66b080e5de96
--- /dev/null
+++ b/sound/soc/ux500/ux500_pcm.c
@@ -0,0 +1,318 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2012
+ *
+ * Author: Ola Lilja <ola.o.lilja@stericsson.com>,
+ *         Roger Nilsson <roger.xr.nilsson@stericsson.com>
+ *         for ST-Ericsson.
+ *
+ * License terms:
+ *
+ * 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.
+ */
+
+#include <asm/page.h>
+
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/slab.h>
+
+#include <plat/ste_dma40.h>
+
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
+
+#include "ux500_msp_i2s.h"
+#include "ux500_pcm.h"
+
+static struct snd_pcm_hardware ux500_pcm_hw_playback = {
+        .info = SNDRV_PCM_INFO_INTERLEAVED |
+                SNDRV_PCM_INFO_MMAP |
+                SNDRV_PCM_INFO_RESUME |
+                SNDRV_PCM_INFO_PAUSE,
+        .formats = SNDRV_PCM_FMTBIT_S16_LE |
+                SNDRV_PCM_FMTBIT_U16_LE |
+                SNDRV_PCM_FMTBIT_S16_BE |
+                SNDRV_PCM_FMTBIT_U16_BE,
+        .rates = SNDRV_PCM_RATE_KNOT,
+        .rate_min = UX500_PLATFORM_MIN_RATE_PLAYBACK,
+        .rate_max = UX500_PLATFORM_MAX_RATE_PLAYBACK,
+        .channels_min = UX500_PLATFORM_MIN_CHANNELS,
+        .channels_max = UX500_PLATFORM_MAX_CHANNELS,
+        .buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
+        .period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
+        .period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
+        .periods_min = UX500_PLATFORM_PERIODS_MIN,
+        .periods_max = UX500_PLATFORM_PERIODS_MAX,
+};
+
+static struct snd_pcm_hardware ux500_pcm_hw_capture = {
+        .info = SNDRV_PCM_INFO_INTERLEAVED |
+                SNDRV_PCM_INFO_MMAP |
+                SNDRV_PCM_INFO_RESUME |
+                SNDRV_PCM_INFO_PAUSE,
+        .formats = SNDRV_PCM_FMTBIT_S16_LE |
+                SNDRV_PCM_FMTBIT_U16_LE |
+                SNDRV_PCM_FMTBIT_S16_BE |
+                SNDRV_PCM_FMTBIT_U16_BE,
+        .rates = SNDRV_PCM_RATE_KNOT,
+        .rate_min = UX500_PLATFORM_MIN_RATE_CAPTURE,
+        .rate_max = UX500_PLATFORM_MAX_RATE_CAPTURE,
+        .channels_min = UX500_PLATFORM_MIN_CHANNELS,
+        .channels_max = UX500_PLATFORM_MAX_CHANNELS,
+        .buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
+        .period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
+        .period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
+        .periods_min = UX500_PLATFORM_PERIODS_MIN,
+        .periods_max = UX500_PLATFORM_PERIODS_MAX,
+};
+
+static void ux500_pcm_dma_hw_free(struct device *dev,
+                                struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct snd_dma_buffer *buf = runtime->dma_buffer_p;
+
+        if (runtime->dma_area == NULL)
+                return;
+
+        if (buf != &substream->dma_buffer) {
+                dma_free_coherent(buf->dev.dev, buf->bytes, buf->area,
+                                buf->addr);
+                kfree(runtime->dma_buffer_p);
+        }
+
+        snd_pcm_set_runtime_buffer(substream, NULL);
+}
+
+static int ux500_pcm_open(struct snd_pcm_substream *substream)
+{
+        int stream_id = substream->pstr->stream;
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_dai *dai = rtd->cpu_dai;
+        struct device *dev = dai->dev;
+        int ret;
+        struct ux500_msp_dma_params *dma_params;
+        u16 per_data_width, mem_data_width;
+        struct stedma40_chan_cfg *dma_cfg;
+
+        dev_dbg(dev, "%s: MSP %d (%s): Enter.\n", __func__, dai->id,
+                snd_pcm_stream_str(substream));
+
+        dev_dbg(dev, "%s: Set runtime hwparams.\n", __func__);
+        if (stream_id == SNDRV_PCM_STREAM_PLAYBACK)
+                snd_soc_set_runtime_hwparams(substream,
+                                        &ux500_pcm_hw_playback);
+        else
+                snd_soc_set_runtime_hwparams(substream,
+                                        &ux500_pcm_hw_capture);
+
+        /* ensure that buffer size is a multiple of period size */
+        ret = snd_pcm_hw_constraint_integer(runtime,
+                                        SNDRV_PCM_HW_PARAM_PERIODS);
+        if (ret < 0) {
+                dev_err(dev, "%s: Error: snd_pcm_hw_constraints failed (%d)\n",
+                        __func__, ret);
+                return ret;
+        }
+
+        dev_dbg(dev, "%s: Set hw-struct for %s.\n", __func__,
+                snd_pcm_stream_str(substream));
+        runtime->hw = (stream_id == SNDRV_PCM_STREAM_PLAYBACK) ?
+                ux500_pcm_hw_playback : ux500_pcm_hw_capture;
+
+        mem_data_width = STEDMA40_HALFWORD_WIDTH;
+
+        dma_params = snd_soc_dai_get_dma_data(dai, substream);
+        switch (dma_params->data_size) {
+        case 32:
+                per_data_width = STEDMA40_WORD_WIDTH;
+                break;
+        case 16:
+                per_data_width = STEDMA40_HALFWORD_WIDTH;
+                break;
+        case 8:
+                per_data_width = STEDMA40_BYTE_WIDTH;
+                break;
+        default:
+                per_data_width = STEDMA40_WORD_WIDTH;
+                dev_warn(rtd->platform->dev,
+                        "%s: Unknown data-size (%d)! Assuming 32 bits.\n",
+                        __func__, dma_params->data_size);
+        }
+
+        dma_cfg = dma_params->dma_cfg;
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                dma_cfg->src_info.data_width = mem_data_width;
+                dma_cfg->dst_info.data_width = per_data_width;
+        } else {
+                dma_cfg->src_info.data_width = per_data_width;
+                dma_cfg->dst_info.data_width = mem_data_width;
+        }
+
+
+        ret = snd_dmaengine_pcm_open(substream, stedma40_filter, dma_cfg);
+        if (ret) {
+                dev_dbg(dai->dev,
+                        "%s: ERROR: snd_dmaengine_pcm_open failed (%d)!\n",
+                        __func__, ret);
+                return ret;
+        }
+
+        snd_dmaengine_pcm_set_data(substream, dma_cfg);
+
+        return 0;
+}
+
+static int ux500_pcm_close(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_dai *dai = rtd->cpu_dai;
+
+        dev_dbg(dai->dev, "%s: Enter\n", __func__);
+
+        snd_dmaengine_pcm_close(substream);
+
+        return 0;
+}
+
+static int ux500_pcm_hw_params(struct snd_pcm_substream *substream,
+                        struct snd_pcm_hw_params *hw_params)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct snd_dma_buffer *buf = runtime->dma_buffer_p;
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        int ret = 0;
+        int size;
+
+        dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);
+
+        size = params_buffer_bytes(hw_params);
+
+        if (buf) {
+                if (buf->bytes >= size)
+                        goto out;
+                ux500_pcm_dma_hw_free(NULL, substream);
+        }
+
+        if (substream->dma_buffer.area != NULL &&
+                substream->dma_buffer.bytes >= size) {
+                buf = &substream->dma_buffer;
+        } else {
+                buf = kmalloc(sizeof(struct snd_dma_buffer), GFP_KERNEL);
+                if (!buf)
+                        goto nomem;
+
+                buf->dev.type = SNDRV_DMA_TYPE_DEV;
+                buf->dev.dev = NULL;
+                buf->area = dma_alloc_coherent(NULL, size, &buf->addr,
+                                        GFP_KERNEL);
+                buf->bytes = size;
+                buf->private_data = NULL;
+
+                if (!buf->area)
+                        goto free;
+        }
+        snd_pcm_set_runtime_buffer(substream, buf);
+        ret = 1;
+ out:
+        runtime->dma_bytes = size;
+        return ret;
+
+ free:
+        kfree(buf);
+ nomem:
+        return -ENOMEM;
+}
+
+static int ux500_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+        dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);
+
+        ux500_pcm_dma_hw_free(NULL, substream);
+
+        return 0;
+}
+
+static int ux500_pcm_mmap(struct snd_pcm_substream *substream,
+                        struct vm_area_struct *vma)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+        dev_dbg(rtd->platform->dev, "%s: Enter.\n", __func__);
+
+        return dma_mmap_coherent(NULL, vma, runtime->dma_area,
+                                runtime->dma_addr, runtime->dma_bytes);
+}
+
+static struct snd_pcm_ops ux500_pcm_ops = {
+        .open           = ux500_pcm_open,
+        .close          = ux500_pcm_close,
+        .ioctl          = snd_pcm_lib_ioctl,
+        .hw_params      = ux500_pcm_hw_params,
+        .hw_free        = ux500_pcm_hw_free,
+        .trigger        = snd_dmaengine_pcm_trigger,
+        .pointer        = snd_dmaengine_pcm_pointer,
+        .mmap           = ux500_pcm_mmap
+};
+
+int ux500_pcm_new(struct snd_soc_pcm_runtime *rtd)
+{
+        struct snd_pcm *pcm = rtd->pcm;
+
+        dev_dbg(rtd->platform->dev, "%s: Enter (id = '%s').\n", __func__,
+                pcm->id);
+
+        pcm->info_flags = 0;
+
+        return 0;
+}
+
+static struct snd_soc_platform_driver ux500_pcm_soc_drv = {
+        .ops            = &ux500_pcm_ops,
+        .pcm_new        = ux500_pcm_new,
+};
+
+static int __devexit ux500_pcm_drv_probe(struct platform_device *pdev)
+{
+        int ret;
+
+        ret = snd_soc_register_platform(&pdev->dev, &ux500_pcm_soc_drv);
+        if (ret < 0) {
+                dev_err(&pdev->dev,
+                        "%s: ERROR: Failed to register platform '%s' (%d)!\n",
+                        __func__, pdev->name, ret);
+                return ret;
+        }
+
+        return 0;
+}
+
+static int __devinit ux500_pcm_drv_remove(struct platform_device *pdev)
+{
+        snd_soc_unregister_platform(&pdev->dev);
+
+        return 0;
+}
+
+static struct platform_driver ux500_pcm_driver = {
+        .driver = {
+                .name = "ux500-pcm",
+                .owner = THIS_MODULE,
+        },
+
+        .probe = ux500_pcm_drv_probe,
+        .remove = __devexit_p(ux500_pcm_drv_remove),
+};
+module_platform_driver(ux500_pcm_driver);
+
+MODULE_LICENSE("GPLv2");
diff --git a/sound/soc/ux500/ux500_pcm.h b/sound/soc/ux500/ux500_pcm.h
new file mode 100644
index 000000000000..77ed44d371e9
--- /dev/null
+++ b/sound/soc/ux500/ux500_pcm.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2012
+ *
+ * Author: Ola Lilja <ola.o.lilja@stericsson.com>,
+ *         Roger Nilsson <roger.xr.nilsson@stericsson.com>
+ *         for ST-Ericsson.
+ *
+ * License terms:
+ *
+ * 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 UX500_PCM_H
+#define UX500_PCM_H
+
+#include <asm/page.h>
+
+#include <linux/workqueue.h>
+
+#define UX500_PLATFORM_MIN_RATE_PLAYBACK 8000
+#define UX500_PLATFORM_MAX_RATE_PLAYBACK 48000
+#define UX500_PLATFORM_MIN_RATE_CAPTURE 8000
+#define UX500_PLATFORM_MAX_RATE_CAPTURE 48000
+
+#define UX500_PLATFORM_MIN_CHANNELS 1
+#define UX500_PLATFORM_MAX_CHANNELS 8
+
+#define UX500_PLATFORM_PERIODS_BYTES_MIN        128
+#define UX500_PLATFORM_PERIODS_BYTES_MAX        (64 * PAGE_SIZE)
+#define UX500_PLATFORM_PERIODS_MIN              2
+#define UX500_PLATFORM_PERIODS_MAX              48
+#define UX500_PLATFORM_BUFFER_BYTES_MAX         (2048 * PAGE_SIZE)
+
+#endif