From: Maruthi Srinivas Bayyavarapu Maruthi.Bayyavarapu@amd.com
ACP IP block consists of dedicated DMA and I2S blocks. The PCM driver provides the platform DMA component to ALSA core.
Signed-off-by: Maruthi Bayyavarapu maruthi.bayyavarapu@amd.com Reviewed-by: Alex Deucher alexander.deucher@amd.com Reviewed-by: Murali Krishna Vemuri murali-krishna.vemuri@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com --- sound/soc/Kconfig | 1 + sound/soc/Makefile | 1 + sound/soc/amd/Kconfig | 4 + sound/soc/amd/Makefile | 3 + sound/soc/amd/acp-pcm-dma.c | 476 ++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 485 insertions(+) create mode 100644 sound/soc/amd/Kconfig create mode 100644 sound/soc/amd/Makefile create mode 100644 sound/soc/amd/acp-pcm-dma.c
diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig index 7ff7d88..a34e9e9 100644 --- a/sound/soc/Kconfig +++ b/sound/soc/Kconfig @@ -38,6 +38,7 @@ config SND_SOC_TOPOLOGY
# All the supported SoCs source "sound/soc/adi/Kconfig" +source "sound/soc/amd/Kconfig" source "sound/soc/atmel/Kconfig" source "sound/soc/au1x/Kconfig" source "sound/soc/bcm/Kconfig" diff --git a/sound/soc/Makefile b/sound/soc/Makefile index 8eb06db..a79a4c7 100644 --- a/sound/soc/Makefile +++ b/sound/soc/Makefile @@ -18,6 +18,7 @@ obj-$(CONFIG_SND_SOC) += snd-soc-core.o obj-$(CONFIG_SND_SOC) += codecs/ obj-$(CONFIG_SND_SOC) += generic/ obj-$(CONFIG_SND_SOC) += adi/ +obj-$(CONFIG_SND_SOC) += amd/ obj-$(CONFIG_SND_SOC) += atmel/ obj-$(CONFIG_SND_SOC) += au1x/ obj-$(CONFIG_SND_SOC) += bcm/ diff --git a/sound/soc/amd/Kconfig b/sound/soc/amd/Kconfig new file mode 100644 index 0000000..78187eb --- /dev/null +++ b/sound/soc/amd/Kconfig @@ -0,0 +1,4 @@ +config SND_SOC_AMD_ACP + tristate "AMD Audio Coprocessor support" + help + This option enables ACP DMA support on AMD platform. diff --git a/sound/soc/amd/Makefile b/sound/soc/amd/Makefile new file mode 100644 index 0000000..62648cb --- /dev/null +++ b/sound/soc/amd/Makefile @@ -0,0 +1,3 @@ +snd-soc-acp-pcm-objs := acp-pcm-dma.o acp.o + +obj-$(CONFIG_SND_SOC_AMD_ACP) += snd-soc-acp-pcm.o diff --git a/sound/soc/amd/acp-pcm-dma.c b/sound/soc/amd/acp-pcm-dma.c new file mode 100644 index 0000000..9734f2e --- /dev/null +++ b/sound/soc/amd/acp-pcm-dma.c @@ -0,0 +1,476 @@ +/* + * AMD ALSA SoC PCM Driver + * + * Copyright 2014-2015 Advanced Micro Devices, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/pci.h> + +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> + +#include "acp.h" + +#define PLAYBACK_MIN_NUM_PERIODS 2 +#define PLAYBACK_MAX_NUM_PERIODS 2 +#define PLAYBACK_MAX_PERIOD_SIZE 16384 +#define PLAYBACK_MIN_PERIOD_SIZE 1024 +#define CAPTURE_MIN_NUM_PERIODS 2 +#define CAPTURE_MAX_NUM_PERIODS 2 +#define CAPTURE_MAX_PERIOD_SIZE 16384 +#define CAPTURE_MIN_PERIOD_SIZE 1024 + +#define NUM_DSCRS_PER_CHANNEL 2 + +#define MAX_BUFFER (PLAYBACK_MAX_PERIOD_SIZE * PLAYBACK_MAX_NUM_PERIODS) +#define MIN_BUFFER MAX_BUFFER + +static const struct snd_pcm_hardware acp_pcm_hardware_playback = { + .info = SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_BATCH | + SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, + .formats = SNDRV_PCM_FMTBIT_S16_LE | + SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE, + .channels_min = 1, + .channels_max = 8, + .rates = SNDRV_PCM_RATE_8000_96000, + .rate_min = 8000, + .rate_max = 96000, + .buffer_bytes_max = PLAYBACK_MAX_NUM_PERIODS * PLAYBACK_MAX_PERIOD_SIZE, + .period_bytes_min = PLAYBACK_MIN_PERIOD_SIZE, + .period_bytes_max = PLAYBACK_MAX_PERIOD_SIZE, + .periods_min = PLAYBACK_MIN_NUM_PERIODS, + .periods_max = PLAYBACK_MAX_NUM_PERIODS, +}; + +static const struct snd_pcm_hardware acp_pcm_hardware_capture = { + .info = SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_BATCH | + SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, + .formats = SNDRV_PCM_FMTBIT_S16_LE | + SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE, + .channels_min = 1, + .channels_max = 2, + .rates = SNDRV_PCM_RATE_8000_48000, + .rate_min = 8000, + .rate_max = 48000, + .buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE, + .period_bytes_min = CAPTURE_MIN_PERIOD_SIZE, + .period_bytes_max = CAPTURE_MAX_PERIOD_SIZE, + .periods_min = CAPTURE_MIN_NUM_PERIODS, + .periods_max = CAPTURE_MAX_NUM_PERIODS, +}; + +struct audio_drv_data { + struct snd_pcm_substream *play_stream; + struct snd_pcm_substream *capture_stream; + void __iomem *acp_mmio; +}; + +/* ACP DMA irq handler routine for playback, capture usecases */ +static irqreturn_t dma_irq_handler(int irq, void *arg) +{ + u16 dscr_idx; + u32 intr_flag; + + int priority_level = 0; + struct device *dev = arg; + + struct audio_drv_data *irq_data; + void __iomem *acp_mmio; + + irq_data = dev_get_drvdata(dev); + acp_mmio = irq_data->acp_mmio; + + intr_flag = acp_get_intr_flag(acp_mmio); + + if ((intr_flag & BIT(ACP_TO_I2S_DMA_CH_NUM)) != 0) { + dscr_idx = get_dscr_idx(acp_mmio, SNDRV_PCM_STREAM_PLAYBACK); + config_acp_dma_channel(acp_mmio, SYSRAM_TO_ACP_CH_NUM, dscr_idx, + 1, priority_level); + acp_dma_start(acp_mmio, SYSRAM_TO_ACP_CH_NUM, false); + + snd_pcm_period_elapsed(irq_data->play_stream); + acp_ext_stat_clear_dmaioc(acp_mmio, ACP_TO_I2S_DMA_CH_NUM); + } + + if ((intr_flag & BIT(I2S_TO_ACP_DMA_CH_NUM)) != 0) { + dscr_idx = get_dscr_idx(acp_mmio, SNDRV_PCM_STREAM_CAPTURE); + config_acp_dma_channel(acp_mmio, ACP_TO_SYSRAM_CH_NUM, dscr_idx, + 1, priority_level); + acp_dma_start(acp_mmio, ACP_TO_SYSRAM_CH_NUM, false); + acp_ext_stat_clear_dmaioc(acp_mmio, I2S_TO_ACP_DMA_CH_NUM); + } + + if ((intr_flag & BIT(ACP_TO_SYSRAM_CH_NUM)) != 0) { + snd_pcm_period_elapsed(irq_data->capture_stream); + acp_ext_stat_clear_dmaioc(acp_mmio, ACP_TO_SYSRAM_CH_NUM); + } + + return IRQ_HANDLED; +} + +static int acp_dma_open(struct snd_pcm_substream *substream) +{ + int ret = 0; + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_soc_pcm_runtime *prtd = substream->private_data; + struct audio_drv_data *intr_data = dev_get_drvdata(prtd->platform->dev); + + struct audio_substream_data *adata = + kzalloc(sizeof(struct audio_substream_data), GFP_KERNEL); + if (adata == NULL) + return -ENOMEM; + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + runtime->hw = acp_pcm_hardware_playback; + else + runtime->hw = acp_pcm_hardware_capture; + + ret = snd_pcm_hw_constraint_integer(runtime, + SNDRV_PCM_HW_PARAM_PERIODS); + if (ret < 0) { + dev_err(prtd->platform->dev, "set integer constraint failed\n"); + return ret; + } + + adata->acp_mmio = intr_data->acp_mmio; + runtime->private_data = adata; + + /* Enable ACP irq, when neither playback or capture streams are + * active by the time when a new stream is being opened. + * This enablement is not required for another stream, if current + * stream is not closed + */ + if (!intr_data->play_stream && !intr_data->capture_stream) + acp_enable_external_interrupts(adata->acp_mmio, 1); + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + intr_data->play_stream = substream; + else + intr_data->capture_stream = substream; + + return 0; +} + +static int acp_dma_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + int status; + uint64_t size; + struct snd_dma_buffer *dma_buffer; + struct page *pg; + struct snd_pcm_runtime *runtime; + struct audio_substream_data *rtd; + + dma_buffer = &substream->dma_buffer; + + runtime = substream->runtime; + rtd = runtime->private_data; + + if (WARN_ON(!rtd)) + return -EINVAL; + + size = params_buffer_bytes(params); + status = snd_pcm_lib_malloc_pages(substream, size); + if (status < 0) + return status; + + memset(substream->runtime->dma_area, 0, params_buffer_bytes(params)); + pg = virt_to_page(substream->dma_buffer.area); + + if (pg != NULL) { + /* Save for runtime private data */ + rtd->pg = pg; + rtd->order = get_order(size); + + /* Fill the page table entries in ACP SRAM */ + rtd->pg = pg; + rtd->size = size; + rtd->num_of_pages = PAGE_ALIGN(size) >> PAGE_SHIFT; + rtd->direction = substream->stream; + + config_acp_dma(rtd->acp_mmio, rtd); + status = 0; + } else { + status = -ENOMEM; + } + return status; +} + +static int acp_dma_hw_free(struct snd_pcm_substream *substream) +{ + return snd_pcm_lib_free_pages(substream); +} + +static snd_pcm_uframes_t acp_dma_pointer(struct snd_pcm_substream *substream) +{ + u16 dscr; + u32 mul, dma_config, period_bytes; + u32 pos = 0; + + struct snd_pcm_runtime *runtime = substream->runtime; + struct audio_substream_data *rtd = runtime->private_data; + + period_bytes = frames_to_bytes(runtime, runtime->period_size); + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + dscr = acp_reg_read(rtd->acp_mmio, mmACP_DMA_CUR_DSCR_13); + + mul = (dscr == PLAYBACK_START_DMA_DESCR_CH13) ? 0 : 1; + pos = (mul * period_bytes); + + } else { + dma_config = acp_reg_read(rtd->acp_mmio, mmACP_DMA_CNTL_14); + if (dma_config != 0) { + dscr = acp_reg_read(rtd->acp_mmio, + mmACP_DMA_CUR_DSCR_14); + mul = (dscr == CAPTURE_START_DMA_DESCR_CH14) ? 1 : 2; + pos = (mul * period_bytes); + } + + if (pos >= (2 * period_bytes)) + pos = 0; + + } + + return bytes_to_frames(runtime, pos); +} + +static int acp_dma_mmap(struct snd_pcm_substream *substream, + struct vm_area_struct *vma) +{ + return snd_pcm_lib_default_mmap(substream, vma); +} + +static int acp_dma_prepare(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct audio_substream_data *rtd = runtime->private_data; + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + config_acp_dma_channel(rtd->acp_mmio, SYSRAM_TO_ACP_CH_NUM, + PLAYBACK_START_DMA_DESCR_CH12, + NUM_DSCRS_PER_CHANNEL, 0); + config_acp_dma_channel(rtd->acp_mmio, ACP_TO_I2S_DMA_CH_NUM, + PLAYBACK_START_DMA_DESCR_CH13, + NUM_DSCRS_PER_CHANNEL, 0); + /* Fill ACP SRAM (2 periods) with zeros from System RAM + * which is zero-ed in hw_params + */ + acp_dma_start(rtd->acp_mmio, SYSRAM_TO_ACP_CH_NUM, false); + + /* ACP SRAM (2 periods of buffer size) is intially filled with + * zeros. Before rendering starts, 2nd half of SRAM will be + * filled with valid audio data DMA'ed from first half of system + * RAM and 1st half of SRAM will be filled with Zeros. This is + * the initial scenario when redering starts from SRAM. Later + * on, 2nd half of system memory will be DMA'ed to 1st half of + * SRAM, 1st half of system memory will be DMA'ed to 2nd half of + * SRAM in ping-pong way till rendering stops. + */ + config_acp_dma_channel(rtd->acp_mmio, SYSRAM_TO_ACP_CH_NUM, + PLAYBACK_START_DMA_DESCR_CH12, + 1, 0); + } else { + config_acp_dma_channel(rtd->acp_mmio, ACP_TO_SYSRAM_CH_NUM, + CAPTURE_START_DMA_DESCR_CH14, + NUM_DSCRS_PER_CHANNEL, 0); + config_acp_dma_channel(rtd->acp_mmio, I2S_TO_ACP_DMA_CH_NUM, + CAPTURE_START_DMA_DESCR_CH15, + NUM_DSCRS_PER_CHANNEL, 0); + } + return 0; +} + +static int acp_dma_trigger(struct snd_pcm_substream *substream, int cmd) +{ + int ret; + + struct snd_pcm_runtime *runtime = substream->runtime; + struct audio_substream_data *rtd = runtime->private_data; + + if (!rtd) + return -EINVAL; + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + case SNDRV_PCM_TRIGGER_RESUME: + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + acp_dma_start(rtd->acp_mmio, + SYSRAM_TO_ACP_CH_NUM, false); + while (acp_reg_read(rtd->acp_mmio, mmACP_DMA_CH_STS) & + BIT(SYSRAM_TO_ACP_CH_NUM)) + cpu_relax(); + + acp_dma_start(rtd->acp_mmio, + ACP_TO_I2S_DMA_CH_NUM, true); + + } else { + acp_dma_start(rtd->acp_mmio, + I2S_TO_ACP_DMA_CH_NUM, true); + } + ret = 0; + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + case SNDRV_PCM_TRIGGER_SUSPEND: + /* Need to stop only circular DMA channels : + * ACP_TO_I2S_DMA_CH_NUM / I2S_TO_ACP_DMA_CH_NUM. Non-circular + * channels will stopped automatically after its transfer + * completes : SYSRAM_TO_ACP_CH_NUM / ACP_TO_SYSRAM_CH_NUM + */ + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + ret = acp_dma_stop(rtd->acp_mmio, + ACP_TO_I2S_DMA_CH_NUM); + else + ret = acp_dma_stop(rtd->acp_mmio, + I2S_TO_ACP_DMA_CH_NUM); + break; + default: + ret = -EINVAL; + + } + return ret; +} + +static int acp_dma_new(struct snd_soc_pcm_runtime *rtd) +{ + return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm, + SNDRV_DMA_TYPE_DEV, + NULL, MIN_BUFFER, + MAX_BUFFER); +} + +static int acp_dma_close(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct audio_substream_data *rtd = runtime->private_data; + struct snd_soc_pcm_runtime *prtd = substream->private_data; + struct audio_drv_data *adata = dev_get_drvdata(prtd->platform->dev); + + kfree(rtd); + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + adata->play_stream = NULL; + else + adata->capture_stream = NULL; + + /* Disable ACP irq, when the current stream is being closed and + * another stream is also not active. + */ + if (!adata->play_stream && !adata->capture_stream) + acp_enable_external_interrupts(adata->acp_mmio, 0); + + return 0; +} + +static struct snd_pcm_ops acp_dma_ops = { + .open = acp_dma_open, + .close = acp_dma_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = acp_dma_hw_params, + .hw_free = acp_dma_hw_free, + .trigger = acp_dma_trigger, + .pointer = acp_dma_pointer, + .mmap = acp_dma_mmap, + .prepare = acp_dma_prepare, +}; + +static struct snd_soc_platform_driver acp_asoc_platform = { + .ops = &acp_dma_ops, + .pcm_new = acp_dma_new, +}; + +static int acp_audio_probe(struct platform_device *pdev) +{ + int status; + struct audio_drv_data *audio_drv_data; + struct resource *res; + + audio_drv_data = devm_kzalloc(&pdev->dev, sizeof(struct audio_drv_data), + GFP_KERNEL); + if (audio_drv_data == NULL) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + audio_drv_data->acp_mmio = devm_ioremap_resource(&pdev->dev, res); + + /* The following members gets populated in device 'open' + * function. Till then interrupts are disabled in 'acp_init' + * and device doesn't generate any interrupts. + */ + + audio_drv_data->play_stream = NULL; + audio_drv_data->capture_stream = NULL; + + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!res) { + dev_err(&pdev->dev, "IORESOURCE_IRQ FAILED\n"); + return -ENODEV; + } + + status = devm_request_irq(&pdev->dev, res->start, dma_irq_handler, + 0, "ACP_IRQ", &pdev->dev); + if (status) { + dev_err(&pdev->dev, "ACP IRQ request failed\n"); + return status; + } + + dev_set_drvdata(&pdev->dev, audio_drv_data); + + /* Initialize the ACP */ + acp_init(audio_drv_data->acp_mmio); + + status = snd_soc_register_platform(&pdev->dev, &acp_asoc_platform); + if (status != 0) { + dev_err(&pdev->dev, "Fail to register ALSA platform device\n"); + return status; + } + + return status; +} + +static int acp_audio_remove(struct platform_device *pdev) +{ + struct audio_drv_data *adata = dev_get_drvdata(&pdev->dev); + + acp_deinit(adata->acp_mmio); + snd_soc_unregister_platform(&pdev->dev); + + return 0; +} + +static struct platform_driver acp_dma_driver = { + .probe = acp_audio_probe, + .remove = acp_audio_remove, + .driver = { + .name = "acp_audio_dma", + }, +}; + +module_platform_driver(acp_dma_driver); + +MODULE_AUTHOR("Maruthi.Bayyavarapu@amd.com"); +MODULE_DESCRIPTION("AMD ACP PCM Driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:acp-dma-audio");