The Spreadtrum DMA engine uses the link-list mode to support audio playback or capture, thus this patch adds audio DMA platform support for CPU DAI to trigger DMA link-list transfer.
Signed-off-by: Baolin Wang baolin.wang@linaro.org --- sound/soc/Kconfig | 1 + sound/soc/Makefile | 1 + sound/soc/sprd/Kconfig | 6 + sound/soc/sprd/Makefile | 4 + sound/soc/sprd/sprd-pcm-dma.c | 562 +++++++++++++++++++++++++++++++++++++++++ sound/soc/sprd/sprd-pcm-dma.h | 15 ++ 6 files changed, 589 insertions(+) create mode 100644 sound/soc/sprd/Kconfig create mode 100644 sound/soc/sprd/Makefile create mode 100644 sound/soc/sprd/sprd-pcm-dma.c create mode 100644 sound/soc/sprd/sprd-pcm-dma.h
diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig index 6592a42..aa35940 100644 --- a/sound/soc/Kconfig +++ b/sound/soc/Kconfig @@ -64,6 +64,7 @@ source "sound/soc/samsung/Kconfig" source "sound/soc/sh/Kconfig" source "sound/soc/sirf/Kconfig" source "sound/soc/spear/Kconfig" +source "sound/soc/sprd/Kconfig" source "sound/soc/sti/Kconfig" source "sound/soc/stm/Kconfig" source "sound/soc/sunxi/Kconfig" diff --git a/sound/soc/Makefile b/sound/soc/Makefile index 48c48c1..974fb98 100644 --- a/sound/soc/Makefile +++ b/sound/soc/Makefile @@ -48,6 +48,7 @@ obj-$(CONFIG_SND_SOC) += samsung/ obj-$(CONFIG_SND_SOC) += sh/ obj-$(CONFIG_SND_SOC) += sirf/ obj-$(CONFIG_SND_SOC) += spear/ +obj-$(CONFIG_SND_SOC) += sprd/ obj-$(CONFIG_SND_SOC) += sti/ obj-$(CONFIG_SND_SOC) += stm/ obj-$(CONFIG_SND_SOC) += sunxi/ diff --git a/sound/soc/sprd/Kconfig b/sound/soc/sprd/Kconfig new file mode 100644 index 0000000..43ece7d --- /dev/null +++ b/sound/soc/sprd/Kconfig @@ -0,0 +1,6 @@ +config SND_SOC_SPRD + tristate "SoC Audio for the Spreadtrum SoC chips" + depends on ARCH_SPRD || COMPILE_TEST + help + Say Y or M if you want to add support for codecs attached to + the Spreadtrum SoCs' Audio interfaces. diff --git a/sound/soc/sprd/Makefile b/sound/soc/sprd/Makefile new file mode 100644 index 0000000..47620e5 --- /dev/null +++ b/sound/soc/sprd/Makefile @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0 +# Spreadtrum Audio Support + +obj-$(CONFIG_SND_SOC_SPRD) += sprd-pcm-dma.o diff --git a/sound/soc/sprd/sprd-pcm-dma.c b/sound/soc/sprd/sprd-pcm-dma.c new file mode 100644 index 0000000..cbb27c4 --- /dev/null +++ b/sound/soc/sprd/sprd-pcm-dma.c @@ -0,0 +1,562 @@ +// 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"); diff --git a/sound/soc/sprd/sprd-pcm-dma.h b/sound/soc/sprd/sprd-pcm-dma.h new file mode 100644 index 0000000..d85a34f --- /dev/null +++ b/sound/soc/sprd/sprd-pcm-dma.h @@ -0,0 +1,15 @@ +// SPDX-License-Identifier: GPL-2.0 + +#ifndef __SPRD_PCM_DMA_H +#define __SPRD_PCM_DMA_H + +#define SPRD_PCM_CHANNEL_MAX 2 + +struct sprd_pcm_dma_params { + dma_addr_t dev_phys[SPRD_PCM_CHANNEL_MAX]; + u32 datawidth[SPRD_PCM_CHANNEL_MAX]; + u32 fragment_len[SPRD_PCM_CHANNEL_MAX]; + const char *chan_name[SPRD_PCM_CHANNEL_MAX]; +}; + +#endif /* __SPRD_PCM_DMA_H */