This patch adds supports for UniPhier AIO DMA.
This module shared register area with all sound devices for I2S, S/PDIF and so on. Since the AIO has mixed register map for those I/Os, it is hard to split register areas for each sound devices.
Signed-off-by: Katsuhiro Suzuki suzuki.katsuhiro@socionext.com
---
Changes in v2: - Change license comment style to C++ from C - Add error checks - Fix typo in error messages - Split DMA, CPU DAI patches from large one - Add comments to aiodma_irq() - Fix missing checks for return value --- sound/soc/uniphier/Makefile | 2 +- sound/soc/uniphier/aio-dma.c | 317 +++++++++++++++++++++++++++++++++++++++++++ sound/soc/uniphier/aio.h | 2 + 3 files changed, 320 insertions(+), 1 deletion(-) create mode 100644 sound/soc/uniphier/aio-dma.c
diff --git a/sound/soc/uniphier/Makefile b/sound/soc/uniphier/Makefile index f3b36aba4879..9efe0feffdc2 100644 --- a/sound/soc/uniphier/Makefile +++ b/sound/soc/uniphier/Makefile @@ -1,5 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 -snd-soc-uniphier-aio-cpu-objs := aio-core.o +snd-soc-uniphier-aio-cpu-objs := aio-core.o aio-dma.o
obj-$(CONFIG_SND_SOC_UNIPHIER_AIO) += snd-soc-uniphier-aio-cpu.o
diff --git a/sound/soc/uniphier/aio-dma.c b/sound/soc/uniphier/aio-dma.c new file mode 100644 index 000000000000..6d0ca6dde913 --- /dev/null +++ b/sound/soc/uniphier/aio-dma.c @@ -0,0 +1,317 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Socionext UniPhier AIO DMA driver. +// +// Copyright (c) 2016-2018 Socionext Inc. +// +// This program is free software; you can redistribute it and/or +// modify it under the terms of the GNU General Public License +// as published by the Free Software Foundation; version 2 +// of the License. +// +// This program is distributed in the hope that 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. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, see http://www.gnu.org/licenses/. + +#include <linux/dma-mapping.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/soc.h> + +#include "aio.h" + +static struct snd_pcm_hardware uniphier_aiodma_hw = { + .info = SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_INTERLEAVED, + .period_bytes_min = 256, + .period_bytes_max = 4096, + .periods_min = 4, + .periods_max = 1024, + .buffer_bytes_max = 128 * 1024, +}; + +static void aiodma_pcm_irq(struct uniphier_aio_sub *sub) +{ + struct snd_pcm_runtime *runtime = sub->substream->runtime; + int bytes = runtime->period_size * + runtime->channels * samples_to_bytes(runtime, 1); + int ret; + + spin_lock(&sub->lock); + ret = aiodma_rb_set_threshold(sub, runtime->dma_bytes, + sub->threshold + bytes); + if (!ret) + sub->threshold += bytes; + + aiodma_rb_sync(sub, runtime->dma_addr, runtime->dma_bytes, bytes); + aiodma_rb_clear_irq(sub); + spin_unlock(&sub->lock); + + snd_pcm_period_elapsed(sub->substream); +} + +static void aiodma_compr_irq(struct uniphier_aio_sub *sub) +{ + struct snd_compr_runtime *runtime = sub->cstream->runtime; + int bytes = runtime->fragment_size; + int ret; + + spin_lock(&sub->lock); + ret = aiodma_rb_set_threshold(sub, sub->compr_bytes, + sub->threshold + bytes); + if (!ret) + sub->threshold += bytes; + + aiodma_rb_sync(sub, sub->compr_addr, sub->compr_bytes, bytes); + aiodma_rb_clear_irq(sub); + spin_unlock(&sub->lock); + + snd_compr_fragment_elapsed(sub->cstream); +} + +static irqreturn_t aiodma_irq(int irq, void *p) +{ + struct platform_device *pdev = p; + struct uniphier_aio_chip *chip = platform_get_drvdata(pdev); + irqreturn_t ret = IRQ_NONE; + int i, j; + + for (i = 0; i < chip->num_aios; i++) { + struct uniphier_aio *aio = &chip->aios[i]; + + for (j = 0; j < ARRAY_SIZE(aio->sub); j++) { + struct uniphier_aio_sub *sub = &aio->sub[j]; + + /* Skip channel that does not trigger */ + if (!sub->running || !aiodma_rb_is_irq(sub)) + continue; + + if (sub->substream) + aiodma_pcm_irq(sub); + if (sub->cstream) + aiodma_compr_irq(sub); + + ret = IRQ_HANDLED; + } + } + + return ret; +} + +static int uniphier_aiodma_open(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + + snd_soc_set_runtime_hwparams(substream, &uniphier_aiodma_hw); + + return snd_pcm_hw_constraint_step(runtime, 0, + SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256); +} + +static int uniphier_aiodma_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); + substream->runtime->dma_bytes = params_buffer_bytes(params); + + return 0; +} + +static int uniphier_aiodma_hw_free(struct snd_pcm_substream *substream) +{ + snd_pcm_set_runtime_buffer(substream, NULL); + substream->runtime->dma_bytes = 0; + + return 0; +} + +static int uniphier_aiodma_prepare(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream); + struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai); + struct uniphier_aio_sub *sub = &aio->sub[substream->stream]; + int bytes = runtime->period_size * + runtime->channels * samples_to_bytes(runtime, 1); + unsigned long flags; + int ret; + + ret = aiodma_ch_set_param(sub); + if (ret) + return ret; + + spin_lock_irqsave(&sub->lock, flags); + ret = aiodma_rb_set_buffer(sub, runtime->dma_addr, + runtime->dma_addr + runtime->dma_bytes, + bytes); + spin_unlock_irqrestore(&sub->lock, flags); + if (ret) + return ret; + + return 0; +} + +static int uniphier_aiodma_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream); + struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai); + struct uniphier_aio_sub *sub = &aio->sub[substream->stream]; + struct device *dev = &aio->chip->pdev->dev; + int bytes = runtime->period_size * + runtime->channels * samples_to_bytes(runtime, 1); + unsigned long flags; + + spin_lock_irqsave(&sub->lock, flags); + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + aiodma_rb_sync(sub, runtime->dma_addr, runtime->dma_bytes, + bytes); + aiodma_ch_set_enable(sub, 1); + sub->running = 1; + + break; + case SNDRV_PCM_TRIGGER_STOP: + sub->running = 0; + aiodma_ch_set_enable(sub, 0); + + break; + default: + dev_warn(dev, "Unknown trigger(%d) ignored\n", cmd); + break; + } + spin_unlock_irqrestore(&sub->lock, flags); + + return 0; +} + +static snd_pcm_uframes_t uniphier_aiodma_pointer( + struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream); + struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai); + struct uniphier_aio_sub *sub = &aio->sub[substream->stream]; + int bytes = runtime->period_size * + runtime->channels * samples_to_bytes(runtime, 1); + unsigned long flags; + snd_pcm_uframes_t pos; + + spin_lock_irqsave(&sub->lock, flags); + aiodma_rb_sync(sub, runtime->dma_addr, runtime->dma_bytes, bytes); + + if (sub->swm->dir == PORT_DIR_OUTPUT) + pos = bytes_to_frames(runtime, sub->rd_offs); + else + pos = bytes_to_frames(runtime, sub->wr_offs); + spin_unlock_irqrestore(&sub->lock, flags); + + return pos; +} + +static int uniphier_aiodma_mmap(struct snd_pcm_substream *substream, + struct vm_area_struct *vma) +{ + vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); + + return remap_pfn_range(vma, vma->vm_start, + substream->dma_buffer.addr >> PAGE_SHIFT, + vma->vm_end - vma->vm_start, vma->vm_page_prot); +} + +static const struct snd_pcm_ops uniphier_aiodma_ops = { + .open = uniphier_aiodma_open, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = uniphier_aiodma_hw_params, + .hw_free = uniphier_aiodma_hw_free, + .prepare = uniphier_aiodma_prepare, + .trigger = uniphier_aiodma_trigger, + .pointer = uniphier_aiodma_pointer, + .mmap = uniphier_aiodma_mmap, +}; + +static int uniphier_aiodma_new(struct snd_soc_pcm_runtime *rtd) +{ + struct device *dev = rtd->card->snd_card->dev; + struct snd_pcm *pcm = rtd->pcm; + int ret; + + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(33)); + if (ret) + return ret; + + return snd_pcm_lib_preallocate_pages_for_all(pcm, + SNDRV_DMA_TYPE_DEV, dev, + uniphier_aiodma_hw.buffer_bytes_max, + uniphier_aiodma_hw.buffer_bytes_max); +} + +static void uniphier_aiodma_free(struct snd_pcm *pcm) +{ + snd_pcm_lib_preallocate_free_for_all(pcm); +} + +static const struct snd_soc_platform_driver uniphier_soc_platform = { + .pcm_new = uniphier_aiodma_new, + .pcm_free = uniphier_aiodma_free, + .ops = &uniphier_aiodma_ops, +}; + +static const struct regmap_config aiodma_regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .max_register = 0x7fffc, + .cache_type = REGCACHE_NONE, +}; + +/** + * uniphier_aiodma_soc_register_platform - register the AIO DMA + * @pdev: the platform device + * + * Register and setup the DMA of AIO to transfer the sound data to device. + * This function need to call once at driver startup and need NOT to call + * unregister function. + * + * Return: Zero if successful, otherwise a negative value on error. + */ +int uniphier_aiodma_soc_register_platform(struct platform_device *pdev) +{ + struct uniphier_aio_chip *chip = platform_get_drvdata(pdev); + struct device *dev = &pdev->dev; + struct resource *res; + void __iomem *preg; + int irq, ret; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + preg = devm_ioremap_resource(dev, res); + if (IS_ERR(preg)) + return PTR_ERR(preg); + + chip->regmap = devm_regmap_init_mmio(dev, preg, + &aiodma_regmap_config); + if (IS_ERR(chip->regmap)) + return PTR_ERR(chip->regmap); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(dev, "Could not get irq.\n"); + return irq; + } + + ret = devm_request_irq(dev, irq, aiodma_irq, + IRQF_SHARED, dev_name(dev), pdev); + if (ret) + return ret; + + return devm_snd_soc_register_platform(dev, &uniphier_soc_platform); +} +EXPORT_SYMBOL_GPL(uniphier_aiodma_soc_register_platform); diff --git a/sound/soc/uniphier/aio.h b/sound/soc/uniphier/aio.h index 774abae28028..3687f6ff30b1 100644 --- a/sound/soc/uniphier/aio.h +++ b/sound/soc/uniphier/aio.h @@ -304,6 +304,8 @@ static inline struct uniphier_aio *uniphier_priv(struct snd_soc_dai *dai) return &chip->aios[dai->id]; }
+int uniphier_aiodma_soc_register_platform(struct platform_device *pdev); + u64 aio_rb_cnt(struct uniphier_aio_sub *sub); u64 aio_rbt_cnt_to_end(struct uniphier_aio_sub *sub); u64 aio_rb_space(struct uniphier_aio_sub *sub);