332 lines
9.5 KiB
C
332 lines
9.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* atmel-pcm.c -- ALSA PCM interface for the Atmel atmel SoC.
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*
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* Copyright (C) 2005 SAN People
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* Copyright (C) 2008 Atmel
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*
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* Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
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*
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* Based on at91-pcm. by:
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* Frank Mandarino <fmandarino@endrelia.com>
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* Copyright 2006 Endrelia Technologies Inc.
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*
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* Based on pxa2xx-pcm.c by:
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*
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* Author: Nicolas Pitre
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* Created: Nov 30, 2004
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* Copyright: (C) 2004 MontaVista Software, Inc.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <linux/atmel_pdc.h>
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#include <linux/atmel-ssc.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include "atmel-pcm.h"
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static int atmel_pcm_new(struct snd_soc_component *component,
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struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_card *card = rtd->card->snd_card;
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int ret;
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ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
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if (ret)
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return ret;
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snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
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card->dev, ATMEL_SSC_DMABUF_SIZE,
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ATMEL_SSC_DMABUF_SIZE);
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return 0;
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}
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/*--------------------------------------------------------------------------*\
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* Hardware definition
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\*--------------------------------------------------------------------------*/
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/* TODO: These values were taken from the AT91 platform driver, check
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* them against real values for AT32
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*/
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static const struct snd_pcm_hardware atmel_pcm_hardware = {
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.info = SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_PAUSE,
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.period_bytes_min = 32,
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.period_bytes_max = 8192,
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.periods_min = 2,
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.periods_max = 1024,
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.buffer_bytes_max = ATMEL_SSC_DMABUF_SIZE,
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};
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/*--------------------------------------------------------------------------*\
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* Data types
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\*--------------------------------------------------------------------------*/
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struct atmel_runtime_data {
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struct atmel_pcm_dma_params *params;
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dma_addr_t dma_buffer; /* physical address of dma buffer */
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dma_addr_t dma_buffer_end; /* first address beyond DMA buffer */
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size_t period_size;
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dma_addr_t period_ptr; /* physical address of next period */
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};
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/*--------------------------------------------------------------------------*\
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* ISR
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\*--------------------------------------------------------------------------*/
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static void atmel_pcm_dma_irq(u32 ssc_sr,
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struct snd_pcm_substream *substream)
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{
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struct atmel_runtime_data *prtd = substream->runtime->private_data;
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struct atmel_pcm_dma_params *params = prtd->params;
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static int count;
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count++;
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if (ssc_sr & params->mask->ssc_endbuf) {
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pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x, count=%d)\n",
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substream->stream == SNDRV_PCM_STREAM_PLAYBACK
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? "underrun" : "overrun",
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params->name, ssc_sr, count);
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/* re-start the PDC */
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ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
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params->mask->pdc_disable);
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prtd->period_ptr += prtd->period_size;
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if (prtd->period_ptr >= prtd->dma_buffer_end)
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prtd->period_ptr = prtd->dma_buffer;
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ssc_writex(params->ssc->regs, params->pdc->xpr,
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prtd->period_ptr);
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ssc_writex(params->ssc->regs, params->pdc->xcr,
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prtd->period_size / params->pdc_xfer_size);
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ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
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params->mask->pdc_enable);
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}
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if (ssc_sr & params->mask->ssc_endx) {
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/* Load the PDC next pointer and counter registers */
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prtd->period_ptr += prtd->period_size;
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if (prtd->period_ptr >= prtd->dma_buffer_end)
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prtd->period_ptr = prtd->dma_buffer;
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ssc_writex(params->ssc->regs, params->pdc->xnpr,
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prtd->period_ptr);
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ssc_writex(params->ssc->regs, params->pdc->xncr,
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prtd->period_size / params->pdc_xfer_size);
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}
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snd_pcm_period_elapsed(substream);
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}
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/*--------------------------------------------------------------------------*\
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* PCM operations
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\*--------------------------------------------------------------------------*/
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static int atmel_pcm_hw_params(struct snd_soc_component *component,
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struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct atmel_runtime_data *prtd = runtime->private_data;
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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/* this may get called several times by oss emulation
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* with different params */
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prtd->params = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
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prtd->params->dma_intr_handler = atmel_pcm_dma_irq;
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prtd->dma_buffer = runtime->dma_addr;
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prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
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prtd->period_size = params_period_bytes(params);
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pr_debug("atmel-pcm: "
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"hw_params: DMA for %s initialized "
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"(dma_bytes=%zu, period_size=%zu)\n",
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prtd->params->name,
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runtime->dma_bytes,
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prtd->period_size);
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return 0;
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}
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static int atmel_pcm_hw_free(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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struct atmel_runtime_data *prtd = substream->runtime->private_data;
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struct atmel_pcm_dma_params *params = prtd->params;
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if (params != NULL) {
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ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
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params->mask->pdc_disable);
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prtd->params->dma_intr_handler = NULL;
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}
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return 0;
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}
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static int atmel_pcm_prepare(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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struct atmel_runtime_data *prtd = substream->runtime->private_data;
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struct atmel_pcm_dma_params *params = prtd->params;
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ssc_writex(params->ssc->regs, SSC_IDR,
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params->mask->ssc_endx | params->mask->ssc_endbuf);
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ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
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params->mask->pdc_disable);
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return 0;
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}
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static int atmel_pcm_trigger(struct snd_soc_component *component,
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struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_pcm_runtime *rtd = substream->runtime;
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struct atmel_runtime_data *prtd = rtd->private_data;
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struct atmel_pcm_dma_params *params = prtd->params;
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int ret = 0;
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pr_debug("atmel-pcm:buffer_size = %ld,"
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"dma_area = %p, dma_bytes = %zu\n",
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rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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prtd->period_ptr = prtd->dma_buffer;
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ssc_writex(params->ssc->regs, params->pdc->xpr,
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prtd->period_ptr);
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ssc_writex(params->ssc->regs, params->pdc->xcr,
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prtd->period_size / params->pdc_xfer_size);
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prtd->period_ptr += prtd->period_size;
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ssc_writex(params->ssc->regs, params->pdc->xnpr,
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prtd->period_ptr);
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ssc_writex(params->ssc->regs, params->pdc->xncr,
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prtd->period_size / params->pdc_xfer_size);
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pr_debug("atmel-pcm: trigger: "
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"period_ptr=%lx, xpr=%u, "
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"xcr=%u, xnpr=%u, xncr=%u\n",
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(unsigned long)prtd->period_ptr,
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ssc_readx(params->ssc->regs, params->pdc->xpr),
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ssc_readx(params->ssc->regs, params->pdc->xcr),
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ssc_readx(params->ssc->regs, params->pdc->xnpr),
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ssc_readx(params->ssc->regs, params->pdc->xncr));
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ssc_writex(params->ssc->regs, SSC_IER,
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params->mask->ssc_endx | params->mask->ssc_endbuf);
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ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
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params->mask->pdc_enable);
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pr_debug("sr=%u imr=%u\n",
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ssc_readx(params->ssc->regs, SSC_SR),
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ssc_readx(params->ssc->regs, SSC_IER));
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break; /* SNDRV_PCM_TRIGGER_START */
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
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params->mask->pdc_disable);
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break;
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
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params->mask->pdc_enable);
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static snd_pcm_uframes_t atmel_pcm_pointer(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct atmel_runtime_data *prtd = runtime->private_data;
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struct atmel_pcm_dma_params *params = prtd->params;
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dma_addr_t ptr;
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snd_pcm_uframes_t x;
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ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr);
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x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
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if (x == runtime->buffer_size)
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x = 0;
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return x;
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}
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static int atmel_pcm_open(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct atmel_runtime_data *prtd;
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int ret = 0;
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snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware);
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/* ensure that buffer size is a multiple of period size */
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ret = snd_pcm_hw_constraint_integer(runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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if (ret < 0)
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goto out;
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prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL);
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if (prtd == NULL) {
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ret = -ENOMEM;
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goto out;
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}
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runtime->private_data = prtd;
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out:
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return ret;
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}
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static int atmel_pcm_close(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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struct atmel_runtime_data *prtd = substream->runtime->private_data;
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kfree(prtd);
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return 0;
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}
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static const struct snd_soc_component_driver atmel_soc_platform = {
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.open = atmel_pcm_open,
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.close = atmel_pcm_close,
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.hw_params = atmel_pcm_hw_params,
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.hw_free = atmel_pcm_hw_free,
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.prepare = atmel_pcm_prepare,
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.trigger = atmel_pcm_trigger,
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.pointer = atmel_pcm_pointer,
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.pcm_construct = atmel_pcm_new,
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};
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int atmel_pcm_pdc_platform_register(struct device *dev)
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{
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return devm_snd_soc_register_component(dev, &atmel_soc_platform,
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NULL, 0);
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}
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EXPORT_SYMBOL(atmel_pcm_pdc_platform_register);
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MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
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MODULE_DESCRIPTION("Atmel PCM module");
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MODULE_LICENSE("GPL");
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