--- /dev/null
+/*
+ * 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 <linux/platform_data/dma-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"
+
+#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)
+
+static const struct snd_pcm_hardware ux500_pcm_hw = {
+ .info = SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_RESUME |
+ SNDRV_PCM_INFO_PAUSE,
+ .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 dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd,
+ struct snd_pcm_substream *substream)
+{
+ struct snd_soc_dai *dai = rtd->cpu_dai;
+ u16 per_data_width, mem_data_width;
+ struct stedma40_chan_cfg *dma_cfg;
+ struct ux500_msp_dma_params *dma_params;
+
+ dma_params = snd_soc_dai_get_dma_data(dai, substream);
+ dma_cfg = dma_params->dma_cfg;
+
+ mem_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+
+ switch (dma_params->data_size) {
+ case 32:
+ per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ break;
+ case 16:
+ per_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ break;
+ case 8:
+ per_data_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ break;
+ default:
+ per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ }
+
+ 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;
+ }
+
+ return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg);
+}
+
+static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct dma_slave_config *slave_config)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct msp_i2s_platform_data *pdata = rtd->cpu_dai->dev->platform_data;
+ struct snd_dmaengine_dai_dma_data *snd_dma_params;
+ struct ux500_msp_dma_params *ste_dma_params;
+ dma_addr_t dma_addr;
+ int ret;
+
+ if (pdata) {
+ ste_dma_params =
+ snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+ dma_addr = ste_dma_params->tx_rx_addr;
+ } else {
+ snd_dma_params =
+ snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+ dma_addr = snd_dma_params->addr;
+ }
+
+ ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
+ if (ret)
+ return ret;
+
+ slave_config->dst_maxburst = 4;
+ slave_config->src_maxburst = 4;
+
+ slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ slave_config->dst_addr = dma_addr;
+ else
+ slave_config->src_addr = dma_addr;
+
+ return 0;
+}
+
+static const struct snd_dmaengine_pcm_config ux500_dmaengine_pcm_config = {
+ .pcm_hardware = &ux500_pcm_hw,
+ .compat_request_channel = ux500_pcm_request_chan,
+ .prealloc_buffer_size = 128 * 1024,
+ .prepare_slave_config = ux500_pcm_prepare_slave_config,
+};
+
+static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
+ .compat_request_channel = ux500_pcm_request_chan,
+ .prepare_slave_config = ux500_pcm_prepare_slave_config,
+};
+
+int ux500_pcm_register_platform(struct platform_device *pdev)
+{
+ const struct snd_dmaengine_pcm_config *pcm_config;
+ struct device_node *np = pdev->dev.of_node;
+ int ret;
+
+ if (np)
+ pcm_config = &ux500_dmaengine_of_pcm_config;
+ else
+ pcm_config = &ux500_dmaengine_pcm_config;
+
+ ret = snd_dmaengine_pcm_register(&pdev->dev, pcm_config,
+ SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
+ SND_DMAENGINE_PCM_FLAG_COMPAT);
+ if (ret < 0) {
+ dev_err(&pdev->dev,
+ "%s: ERROR: Failed to register platform '%s' (%d)!\n",
+ __func__, pdev->name, ret);
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
+
+int ux500_pcm_unregister_platform(struct platform_device *pdev)
+{
+ snd_dmaengine_pcm_unregister(&pdev->dev);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
Code Review / kvmfornfv.git / blobdiff