--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 Spreadtrum Communications Inc.
+
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/dma/sprd-dma.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include "sprd-pcm-dma.h"
+
+#define DRV_NAME "sprd_pcm_dma"
+#define SPRD_PCM_DMA_LINKLIST_SIZE 64
+#define SPRD_PCM_DMA_BRUST_LEN 640
+
+struct sprd_pcm_dma_data {
+ struct dma_chan *chan;
+ struct dma_async_tx_descriptor *desc;
+ dma_cookie_t cookie;
+ dma_addr_t phys;
+ void *virt;
+ int pre_pointer;
+};
+
+struct sprd_pcm_dma_private {
+ struct snd_pcm_substream *substream;
+ struct sprd_pcm_dma_params *params;
+ struct sprd_pcm_dma_data data[SPRD_PCM_CHANNEL_MAX];
+ int hw_chan;
+ int dma_addr_offset;
+};
+
+static const struct snd_pcm_hardware sprd_pcm_hardware = {
+ .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_PAUSE |
+ SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
+ .period_bytes_min = 1,
+ .period_bytes_max = 64 * 1024,
+ .periods_min = 1,
+ .periods_max = PAGE_SIZE / SPRD_PCM_DMA_LINKLIST_SIZE,
+ .buffer_bytes_max = 64 * 1024,
+};
+
+static int sprd_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_component *component =
+ snd_soc_rtdcom_lookup(rtd, DRV_NAME);
+ struct device *dev = component->dev;
+ struct sprd_pcm_dma_private *dma_private;
+ int hw_chan = SPRD_PCM_CHANNEL_MAX;
+ int size, ret, i;
+
+ snd_soc_set_runtime_hwparams(substream, &sprd_pcm_hardware);
+
+ ret = snd_pcm_hw_constraint_step(runtime, 0,
+ SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
+ SPRD_PCM_DMA_BRUST_LEN);
+ if (ret < 0)
+ return ret;
+
+ ret = snd_pcm_hw_constraint_step(runtime, 0,
+ SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
+ SPRD_PCM_DMA_BRUST_LEN);
+ if (ret < 0)
+ return ret;
+
+ ret = snd_pcm_hw_constraint_integer(runtime,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+ if (ret < 0)
+ return ret;
+
+ dma_private = devm_kzalloc(dev, sizeof(*dma_private), GFP_KERNEL);
+ if (!dma_private)
+ return -ENOMEM;
+
+ size = runtime->hw.periods_max * SPRD_PCM_DMA_LINKLIST_SIZE;
+
+ for (i = 0; i < hw_chan; i++) {
+ struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+ data->virt = dmam_alloc_coherent(dev, size, &data->phys,
+ GFP_KERNEL);
+ if (!data->virt) {
+ ret = -ENOMEM;
+ goto error;
+ }
+ }
+
+ dma_private->hw_chan = hw_chan;
+ runtime->private_data = dma_private;
+ dma_private->substream = substream;
+
+ return 0;
+
+error:
+ for (i = 0; i < hw_chan; i++) {
+ struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+ if (data->virt)
+ dmam_free_coherent(dev, size, data->virt, data->phys);
+ }
+
+ devm_kfree(dev, dma_private);
+ return ret;
+}
+
+static int sprd_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct sprd_pcm_dma_private *dma_private = runtime->private_data;
+ struct snd_soc_component *component =
+ snd_soc_rtdcom_lookup(rtd, DRV_NAME);
+ struct device *dev = component->dev;
+ int size = runtime->hw.periods_max * SPRD_PCM_DMA_LINKLIST_SIZE;
+ int i;
+
+ for (i = 0; i < dma_private->hw_chan; i++) {
+ struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+ dmam_free_coherent(dev, size, data->virt, data->phys);
+ }
+
+ devm_kfree(dev, dma_private);
+
+ return 0;
+}
+
+static void sprd_pcm_dma_complete(void *data)
+{
+ struct sprd_pcm_dma_private *dma_private = data;
+ struct snd_pcm_substream *substream = dma_private->substream;
+
+ snd_pcm_period_elapsed(substream);
+}
+
+static void sprd_pcm_release_dma_channel(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct sprd_pcm_dma_private *dma_private = runtime->private_data;
+ int i;
+
+ for (i = 0; i < SPRD_PCM_CHANNEL_MAX; i++) {
+ struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+ if (data->chan) {
+ dma_release_channel(data->chan);
+ data->chan = NULL;
+ }
+ }
+}
+
+static int sprd_pcm_request_dma_channel(struct snd_pcm_substream *substream,
+ int channels)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct sprd_pcm_dma_private *dma_private = runtime->private_data;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_component *component =
+ snd_soc_rtdcom_lookup(rtd, DRV_NAME);
+ struct device *dev = component->dev;
+ struct sprd_pcm_dma_params *dma_params = dma_private->params;
+ int i;
+
+ if (channels > SPRD_PCM_CHANNEL_MAX) {
+ dev_err(dev, "invalid dma channel number:%d\n", channels);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < channels; i++) {
+ struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+ data->chan = dma_request_slave_channel(dev,
+ dma_params->chan_name[i]);
+ if (!data->chan) {
+ dev_err(dev, "failed to request dma channel:%s\n",
+ dma_params->chan_name[i]);
+ sprd_pcm_release_dma_channel(substream);
+ return -ENODEV;
+ }
+ }
+
+ return 0;
+}
+
+static int sprd_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct sprd_pcm_dma_private *dma_private = runtime->private_data;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_component *component =
+ snd_soc_rtdcom_lookup(rtd, DRV_NAME);
+ struct sprd_pcm_dma_params *dma_params;
+ size_t totsize = params_buffer_bytes(params);
+ size_t period = params_period_bytes(params);
+ int channels = params_channels(params);
+ int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+ struct scatterlist *sg;
+ unsigned long flags;
+ int ret, i, j, sg_num;
+
+ dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+ if (!dma_params) {
+ dev_warn(component->dev, "no dma parameters setting\n");
+ dma_private->params = NULL;
+ snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+ runtime->dma_bytes = totsize;
+ return 0;
+ }
+
+ if (!dma_private->params) {
+ dma_private->params = dma_params;
+ ret = sprd_pcm_request_dma_channel(substream, channels);
+ if (ret)
+ return ret;
+ }
+
+ snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+
+ runtime->dma_bytes = totsize;
+ sg_num = totsize / period;
+ dma_private->dma_addr_offset = totsize / channels;
+
+ sg = devm_kcalloc(component->dev, sg_num, sizeof(*sg), GFP_KERNEL);
+ if (!sg) {
+ ret = -ENOMEM;
+ goto sg_err;
+ }
+
+ for (i = 0; i < channels; i++) {
+ struct sprd_pcm_dma_data *data = &dma_private->data[i];
+ struct dma_chan *chan = data->chan;
+ struct dma_slave_config config = { };
+ struct sprd_dma_linklist link = { };
+ enum dma_transfer_direction dir;
+ struct scatterlist *sgt = sg;
+
+ config.src_maxburst = dma_params->fragment_len[i];
+ config.src_addr_width = dma_params->datawidth[i];
+ config.dst_addr_width = dma_params->datawidth[i];
+ if (is_playback) {
+ config.src_addr = runtime->dma_addr +
+ i * dma_private->dma_addr_offset;
+ config.dst_addr = dma_params->dev_phys[i];
+ dir = DMA_MEM_TO_DEV;
+ } else {
+ config.src_addr = dma_params->dev_phys[i];
+ config.dst_addr = runtime->dma_addr +
+ i * dma_private->dma_addr_offset;
+ dir = DMA_DEV_TO_MEM;
+ }
+
+ sg_init_table(sgt, sg_num);
+ for (j = 0; j < sg_num; j++, sgt++) {
+ u32 sg_len = period / channels;
+
+ sg_dma_len(sgt) = sg_len;
+ sg_dma_address(sgt) = runtime->dma_addr +
+ i * dma_private->dma_addr_offset + sg_len * j;
+ }
+
+ /*
+ * Configure the link-list address for the DMA engine link-list
+ * mode.
+ */
+ link.virt_addr = (unsigned long)data->virt;
+ link.phy_addr = data->phys;
+
+ ret = dmaengine_slave_config(chan, &config);
+ if (ret) {
+ dev_err(component->dev,
+ "failed to set slave configuration: %d\n", ret);
+ goto config_err;
+ }
+
+ /*
+ * We configure the DMA request mode, interrupt mode, channel
+ * mode and channel trigger mode by the flags.
+ */
+ flags = SPRD_DMA_FLAGS(SPRD_DMA_CHN_MODE_NONE, SPRD_DMA_NO_TRG,
+ SPRD_DMA_FRAG_REQ, SPRD_DMA_TRANS_INT);
+ data->desc = chan->device->device_prep_slave_sg(chan, sg,
+ sg_num, dir,
+ flags, &link);
+ if (!data->desc) {
+ dev_err(component->dev, "failed to prepare slave sg\n");
+ ret = -ENOMEM;
+ goto config_err;
+ }
+
+ if (!runtime->no_period_wakeup) {
+ data->desc->callback = sprd_pcm_dma_complete;
+ data->desc->callback_param = dma_private;
+ }
+ }
+
+ devm_kfree(component->dev, sg);
+
+ return 0;
+
+config_err:
+ devm_kfree(component->dev, sg);
+sg_err:
+ sprd_pcm_release_dma_channel(substream);
+ return ret;
+}
+
+static int sprd_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ snd_pcm_set_runtime_buffer(substream, NULL);
+ sprd_pcm_release_dma_channel(substream);
+
+ return 0;
+}
+
+static int sprd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct sprd_pcm_dma_private *dma_private =
+ substream->runtime->private_data;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_component *component =
+ snd_soc_rtdcom_lookup(rtd, DRV_NAME);
+ int ret = 0, i;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ for (i = 0; i < dma_private->hw_chan; i++) {
+ struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+ if (!data->desc)
+ continue;
+
+ data->cookie = dmaengine_submit(data->desc);
+ ret = dma_submit_error(data->cookie);
+ if (ret) {
+ dev_err(component->dev,
+ "failed to submit dma request: %d\n",
+ ret);
+ return ret;
+ }
+
+ dma_async_issue_pending(data->chan);
+ }
+
+ break;
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ for (i = 0; i < dma_private->hw_chan; i++) {
+ struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+ if (data->chan)
+ dmaengine_resume(data->chan);
+ }
+
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ for (i = 0; i < dma_private->hw_chan; i++) {
+ struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+ if (data->chan)
+ dmaengine_terminate_async(data->chan);
+ }
+
+ break;
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ for (i = 0; i < dma_private->hw_chan; i++) {
+ struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+ if (data->chan)
+ dmaengine_pause(data->chan);
+ }
+
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static snd_pcm_uframes_t sprd_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct sprd_pcm_dma_private *dma_private = runtime->private_data;
+ struct snd_soc_component *component =
+ snd_soc_rtdcom_lookup(rtd, DRV_NAME);
+ int pointer[SPRD_PCM_CHANNEL_MAX];
+ int bytes_of_pointer = 0, sel_max = 0, i;
+ snd_pcm_uframes_t x;
+ struct dma_tx_state state;
+ enum dma_status status;
+
+ for (i = 0; i < dma_private->hw_chan; i++) {
+ struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+ if (!data->chan)
+ continue;
+
+ status = dmaengine_tx_status(data->chan, data->cookie, &state);
+ if (status == DMA_ERROR) {
+ dev_err(component->dev,
+ "failed to get dma channel %d status\n", i);
+ return 0;
+ }
+
+ /*
+ * We just get current transfer address from the DMA engine, so
+ * we need convert to current pointer.
+ */
+ pointer[i] = state.residue - runtime->dma_addr -
+ i * dma_private->dma_addr_offset;
+
+ if (i == 0) {
+ bytes_of_pointer = pointer[i];
+ sel_max = pointer[i] < data->pre_pointer ? 1 : 0;
+ } else {
+ sel_max ^= pointer[i] < data->pre_pointer ? 1 : 0;
+
+ if (sel_max)
+ bytes_of_pointer =
+ max(pointer[i], pointer[i - 1]) << 1;
+ else
+ bytes_of_pointer =
+ min(pointer[i], pointer[i - 1]) << 1;
+ }
+
+ data->pre_pointer = pointer[i];
+ }
+
+ x = bytes_to_frames(runtime, bytes_of_pointer);
+ if (x == runtime->buffer_size)
+ x = 0;
+
+ return x;
+}
+
+static int sprd_pcm_mmap(struct snd_pcm_substream *substream,
+ struct vm_area_struct *vma)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+ return remap_pfn_range(vma, vma->vm_start,
+ runtime->dma_addr >> PAGE_SHIFT,
+ vma->vm_end - vma->vm_start,
+ vma->vm_page_prot);
+}
+
+static struct snd_pcm_ops sprd_pcm_ops = {
+ .open = sprd_pcm_open,
+ .close = sprd_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = sprd_pcm_hw_params,
+ .hw_free = sprd_pcm_hw_free,
+ .trigger = sprd_pcm_trigger,
+ .pointer = sprd_pcm_pointer,
+ .mmap = sprd_pcm_mmap,
+};
+
+static int sprd_pcm_new(struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_card *card = rtd->card->snd_card;
+ struct snd_pcm *pcm = rtd->pcm;
+ struct snd_pcm_substream *substream;
+ int ret;
+
+ ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
+ if (ret)
+ return ret;
+
+ substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
+ if (substream) {
+ ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,
+ sprd_pcm_hardware.buffer_bytes_max,
+ &substream->dma_buffer);
+ if (ret) {
+ dev_err(card->dev,
+ "can't alloc playback dma buffer: %d\n", ret);
+ return ret;
+ }
+ }
+
+ substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
+ if (substream) {
+ ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,
+ sprd_pcm_hardware.buffer_bytes_max,
+ &substream->dma_buffer);
+ if (ret) {
+ dev_err(card->dev,
+ "can't alloc capture dma buffer: %d\n", ret);
+ snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static void sprd_pcm_free(struct snd_pcm *pcm)
+{
+ struct snd_pcm_substream *substream;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(pcm->streams); i++) {
+ substream = pcm->streams[i].substream;
+ if (substream) {
+ snd_dma_free_pages(&substream->dma_buffer);
+ substream->dma_buffer.area = NULL;
+ substream->dma_buffer.addr = 0;
+ }
+ }
+}
+
+static const struct snd_soc_component_driver sprd_soc_component = {
+ .name = DRV_NAME,
+ .ops = &sprd_pcm_ops,
+ .pcm_new = sprd_pcm_new,
+ .pcm_free = sprd_pcm_free,
+};
+
+static int sprd_soc_platform_probe(struct platform_device *pdev)
+{
+ int ret;
+
+ ret = devm_snd_soc_register_component(&pdev->dev, &sprd_soc_component,
+ NULL, 0);
+ if (ret)
+ dev_err(&pdev->dev, "could not register platform:%d\n", ret);
+
+ return ret;
+}
+
+static const struct of_device_id sprd_pcm_of_match[] = {
+ { .compatible = "sprd,pcm-platform", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, sprd_pcm_of_match);
+
+static struct platform_driver sprd_pcm_driver = {
+ .driver = {
+ .name = "sprd-pcm-audio",
+ .of_match_table = sprd_pcm_of_match,
+ },
+
+ .probe = sprd_soc_platform_probe,
+};
+
+module_platform_driver(sprd_pcm_driver);
+
+MODULE_DESCRIPTION("Spreadtrum ASoC PCM DMA");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:sprd-audio");
projects / platform / kernel / linux-rpi.git / commitdiff