8f159d720b
All DMA blocks are lined up to period boundaries, but the DMA handling code tracks bytes instead. This patch reworks the code to track the period index into the DMA buffer instead of the physical address pointer. Doing so makes the code simpler and easier to understand. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
580 lines
16 KiB
C
580 lines
16 KiB
C
/*
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* Freescale MPC5200 PSC DMA
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* ALSA SoC Platform driver
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*
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* Copyright (C) 2008 Secret Lab Technologies Ltd.
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* Copyright (C) 2009 Jon Smirl, Digispeaker
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*/
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <sound/soc.h>
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#include <sysdev/bestcomm/bestcomm.h>
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#include <sysdev/bestcomm/gen_bd.h>
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#include <asm/mpc52xx_psc.h>
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#include "mpc5200_dma.h"
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/*
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* Interrupt handlers
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*/
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static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma)
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{
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struct psc_dma *psc_dma = _psc_dma;
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struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
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u16 isr;
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isr = in_be16(®s->mpc52xx_psc_isr);
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/* Playback underrun error */
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if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
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psc_dma->stats.underrun_count++;
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/* Capture overrun error */
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if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
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psc_dma->stats.overrun_count++;
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out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT);
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return IRQ_HANDLED;
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}
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/**
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* psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer
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* @s: pointer to stream private data structure
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*
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* Enqueues another audio period buffer into the bestcomm queue.
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*
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* Note: The routine must only be called when there is space available in
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* the queue. Otherwise the enqueue will fail and the audio ring buffer
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* will get out of sync
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*/
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static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
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{
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struct bcom_bd *bd;
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/* Prepare and enqueue the next buffer descriptor */
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bd = bcom_prepare_next_buffer(s->bcom_task);
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bd->status = s->period_bytes;
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bd->data[0] = s->runtime->dma_addr + (s->period_next * s->period_bytes);
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bcom_submit_next_buffer(s->bcom_task, NULL);
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/* Update for next period */
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s->period_next = (s->period_next + 1) % s->runtime->periods;
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}
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static void psc_dma_bcom_enqueue_tx(struct psc_dma_stream *s)
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{
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if (s->appl_ptr > s->runtime->control->appl_ptr) {
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/*
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* In this case s->runtime->control->appl_ptr has wrapped around.
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* Play the data to the end of the boundary, then wrap our own
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* appl_ptr back around.
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*/
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while (s->appl_ptr < s->runtime->boundary) {
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if (bcom_queue_full(s->bcom_task))
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return;
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s->appl_ptr += s->runtime->period_size;
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psc_dma_bcom_enqueue_next_buffer(s);
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}
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s->appl_ptr -= s->runtime->boundary;
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}
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while (s->appl_ptr < s->runtime->control->appl_ptr) {
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if (bcom_queue_full(s->bcom_task))
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return;
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s->appl_ptr += s->runtime->period_size;
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psc_dma_bcom_enqueue_next_buffer(s);
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}
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}
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/* Bestcomm DMA irq handler */
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static irqreturn_t psc_dma_bcom_irq_tx(int irq, void *_psc_dma_stream)
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{
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struct psc_dma_stream *s = _psc_dma_stream;
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spin_lock(&s->psc_dma->lock);
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/* For each finished period, dequeue the completed period buffer
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* and enqueue a new one in it's place. */
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while (bcom_buffer_done(s->bcom_task)) {
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bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
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s->period_current = (s->period_current+1) % s->runtime->periods;
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}
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psc_dma_bcom_enqueue_tx(s);
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spin_unlock(&s->psc_dma->lock);
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/* If the stream is active, then also inform the PCM middle layer
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* of the period finished event. */
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if (s->active)
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snd_pcm_period_elapsed(s->stream);
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return IRQ_HANDLED;
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}
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static irqreturn_t psc_dma_bcom_irq_rx(int irq, void *_psc_dma_stream)
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{
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struct psc_dma_stream *s = _psc_dma_stream;
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spin_lock(&s->psc_dma->lock);
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/* For each finished period, dequeue the completed period buffer
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* and enqueue a new one in it's place. */
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while (bcom_buffer_done(s->bcom_task)) {
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bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
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s->period_current = (s->period_current+1) % s->runtime->periods;
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psc_dma_bcom_enqueue_next_buffer(s);
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}
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spin_unlock(&s->psc_dma->lock);
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/* If the stream is active, then also inform the PCM middle layer
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* of the period finished event. */
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if (s->active)
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snd_pcm_period_elapsed(s->stream);
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return IRQ_HANDLED;
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}
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static int psc_dma_hw_free(struct snd_pcm_substream *substream)
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{
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snd_pcm_set_runtime_buffer(substream, NULL);
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return 0;
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}
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/**
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* psc_dma_trigger: start and stop the DMA transfer.
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*
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* This function is called by ALSA to start, stop, pause, and resume the DMA
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* transfer of data.
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*/
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static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct psc_dma_stream *s;
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struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
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u16 imr;
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unsigned long flags;
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int i;
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
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s = &psc_dma->capture;
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else
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s = &psc_dma->playback;
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dev_dbg(psc_dma->dev, "psc_dma_trigger(substream=%p, cmd=%i)"
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" stream_id=%i\n",
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substream, cmd, substream->pstr->stream);
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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s->period_bytes = frames_to_bytes(runtime,
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runtime->period_size);
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s->period_next = 0;
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s->period_current = 0;
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s->active = 1;
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/* track appl_ptr so that we have a better chance of detecting
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* end of stream and not over running it.
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*/
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s->runtime = runtime;
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s->appl_ptr = s->runtime->control->appl_ptr -
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(runtime->period_size * runtime->periods);
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/* Fill up the bestcomm bd queue and enable DMA.
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* This will begin filling the PSC's fifo.
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*/
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spin_lock_irqsave(&psc_dma->lock, flags);
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
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bcom_gen_bd_rx_reset(s->bcom_task);
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for (i = 0; i < runtime->periods; i++)
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if (!bcom_queue_full(s->bcom_task))
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psc_dma_bcom_enqueue_next_buffer(s);
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} else {
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bcom_gen_bd_tx_reset(s->bcom_task);
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psc_dma_bcom_enqueue_tx(s);
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}
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bcom_enable(s->bcom_task);
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spin_unlock_irqrestore(&psc_dma->lock, flags);
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out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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s->active = 0;
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spin_lock_irqsave(&psc_dma->lock, flags);
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bcom_disable(s->bcom_task);
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
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bcom_gen_bd_rx_reset(s->bcom_task);
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else
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bcom_gen_bd_tx_reset(s->bcom_task);
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spin_unlock_irqrestore(&psc_dma->lock, flags);
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break;
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default:
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dev_dbg(psc_dma->dev, "invalid command\n");
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return -EINVAL;
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}
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/* Update interrupt enable settings */
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imr = 0;
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if (psc_dma->playback.active)
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imr |= MPC52xx_PSC_IMR_TXEMP;
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if (psc_dma->capture.active)
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imr |= MPC52xx_PSC_IMR_ORERR;
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out_be16(®s->isr_imr.imr, psc_dma->imr | imr);
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return 0;
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}
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/* ---------------------------------------------------------------------
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* The PSC DMA 'ASoC platform' driver
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*
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* Can be referenced by an 'ASoC machine' driver
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* This driver only deals with the audio bus; it doesn't have any
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* interaction with the attached codec
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*/
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static const struct snd_pcm_hardware psc_dma_hardware = {
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.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_BATCH,
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.formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |
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SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
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.rate_min = 8000,
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.rate_max = 48000,
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.channels_min = 1,
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.channels_max = 2,
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.period_bytes_max = 1024 * 1024,
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.period_bytes_min = 32,
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.periods_min = 2,
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.periods_max = 256,
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.buffer_bytes_max = 2 * 1024 * 1024,
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.fifo_size = 512,
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};
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static int psc_dma_open(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 snd_soc_pcm_runtime *rtd = substream->private_data;
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struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
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struct psc_dma_stream *s;
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int rc;
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dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream);
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
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s = &psc_dma->capture;
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else
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s = &psc_dma->playback;
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snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware);
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rc = snd_pcm_hw_constraint_integer(runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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if (rc < 0) {
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dev_err(substream->pcm->card->dev, "invalid buffer size\n");
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return rc;
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}
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s->stream = substream;
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return 0;
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}
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static int psc_dma_close(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
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struct psc_dma_stream *s;
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dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream);
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
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s = &psc_dma->capture;
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else
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s = &psc_dma->playback;
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if (!psc_dma->playback.active &&
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!psc_dma->capture.active) {
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/* Disable all interrupts and reset the PSC */
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out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
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out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
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}
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s->stream = NULL;
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return 0;
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}
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static snd_pcm_uframes_t
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psc_dma_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
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struct psc_dma_stream *s;
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dma_addr_t count;
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
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s = &psc_dma->capture;
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else
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s = &psc_dma->playback;
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count = s->period_current * s->period_bytes;
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return bytes_to_frames(substream->runtime, count);
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}
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static int
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psc_dma_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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return 0;
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}
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static struct snd_pcm_ops psc_dma_ops = {
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.open = psc_dma_open,
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.close = psc_dma_close,
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.hw_free = psc_dma_hw_free,
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.ioctl = snd_pcm_lib_ioctl,
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.pointer = psc_dma_pointer,
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.trigger = psc_dma_trigger,
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.hw_params = psc_dma_hw_params,
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};
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static u64 psc_dma_dmamask = 0xffffffff;
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static int psc_dma_new(struct snd_card *card, struct snd_soc_dai *dai,
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struct snd_pcm *pcm)
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{
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struct snd_soc_pcm_runtime *rtd = pcm->private_data;
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struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
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size_t size = psc_dma_hardware.buffer_bytes_max;
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int rc = 0;
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dev_dbg(rtd->socdev->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n",
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card, dai, pcm);
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if (!card->dev->dma_mask)
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card->dev->dma_mask = &psc_dma_dmamask;
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if (!card->dev->coherent_dma_mask)
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card->dev->coherent_dma_mask = 0xffffffff;
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if (pcm->streams[0].substream) {
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rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
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size, &pcm->streams[0].substream->dma_buffer);
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if (rc)
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goto playback_alloc_err;
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}
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if (pcm->streams[1].substream) {
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rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
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size, &pcm->streams[1].substream->dma_buffer);
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if (rc)
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goto capture_alloc_err;
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}
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if (rtd->socdev->card->codec->ac97)
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rtd->socdev->card->codec->ac97->private_data = psc_dma;
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return 0;
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capture_alloc_err:
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if (pcm->streams[0].substream)
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snd_dma_free_pages(&pcm->streams[0].substream->dma_buffer);
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playback_alloc_err:
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dev_err(card->dev, "Cannot allocate buffer(s)\n");
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return -ENOMEM;
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}
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static void psc_dma_free(struct snd_pcm *pcm)
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{
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struct snd_soc_pcm_runtime *rtd = pcm->private_data;
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struct snd_pcm_substream *substream;
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int stream;
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dev_dbg(rtd->socdev->dev, "psc_dma_free(pcm=%p)\n", pcm);
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for (stream = 0; stream < 2; stream++) {
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substream = pcm->streams[stream].substream;
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if (substream) {
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snd_dma_free_pages(&substream->dma_buffer);
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substream->dma_buffer.area = NULL;
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substream->dma_buffer.addr = 0;
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}
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}
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}
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struct snd_soc_platform mpc5200_audio_dma_platform = {
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.name = "mpc5200-psc-audio",
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.pcm_ops = &psc_dma_ops,
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.pcm_new = &psc_dma_new,
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.pcm_free = &psc_dma_free,
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};
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EXPORT_SYMBOL_GPL(mpc5200_audio_dma_platform);
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int mpc5200_audio_dma_create(struct of_device *op)
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{
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phys_addr_t fifo;
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struct psc_dma *psc_dma;
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struct resource res;
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int size, irq, rc;
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const __be32 *prop;
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void __iomem *regs;
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int ret;
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/* Fetch the registers and IRQ of the PSC */
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irq = irq_of_parse_and_map(op->node, 0);
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if (of_address_to_resource(op->node, 0, &res)) {
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dev_err(&op->dev, "Missing reg property\n");
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return -ENODEV;
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}
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regs = ioremap(res.start, 1 + res.end - res.start);
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if (!regs) {
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dev_err(&op->dev, "Could not map registers\n");
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return -ENODEV;
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}
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/* Allocate and initialize the driver private data */
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psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
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if (!psc_dma) {
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ret = -ENOMEM;
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goto out_unmap;
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}
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/* Get the PSC ID */
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prop = of_get_property(op->node, "cell-index", &size);
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if (!prop || size < sizeof *prop) {
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ret = -ENODEV;
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goto out_free;
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}
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spin_lock_init(&psc_dma->lock);
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mutex_init(&psc_dma->mutex);
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psc_dma->id = be32_to_cpu(*prop);
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psc_dma->irq = irq;
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psc_dma->psc_regs = regs;
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psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs;
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psc_dma->dev = &op->dev;
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psc_dma->playback.psc_dma = psc_dma;
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psc_dma->capture.psc_dma = psc_dma;
|
|
snprintf(psc_dma->name, sizeof psc_dma->name, "PSC%u", psc_dma->id);
|
|
|
|
/* Find the address of the fifo data registers and setup the
|
|
* DMA tasks */
|
|
fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
|
|
psc_dma->capture.bcom_task =
|
|
bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512);
|
|
psc_dma->playback.bcom_task =
|
|
bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo);
|
|
if (!psc_dma->capture.bcom_task ||
|
|
!psc_dma->playback.bcom_task) {
|
|
dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
|
|
ret = -ENODEV;
|
|
goto out_free;
|
|
}
|
|
|
|
/* Disable all interrupts and reset the PSC */
|
|
out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
|
|
/* reset receiver */
|
|
out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX);
|
|
/* reset transmitter */
|
|
out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX);
|
|
/* reset error */
|
|
out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT);
|
|
/* reset mode */
|
|
out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1);
|
|
|
|
/* Set up mode register;
|
|
* First write: RxRdy (FIFO Alarm) generates rx FIFO irq
|
|
* Second write: register Normal mode for non loopback
|
|
*/
|
|
out_8(&psc_dma->psc_regs->mode, 0);
|
|
out_8(&psc_dma->psc_regs->mode, 0);
|
|
|
|
/* Set the TX and RX fifo alarm thresholds */
|
|
out_be16(&psc_dma->fifo_regs->rfalarm, 0x100);
|
|
out_8(&psc_dma->fifo_regs->rfcntl, 0x4);
|
|
out_be16(&psc_dma->fifo_regs->tfalarm, 0x100);
|
|
out_8(&psc_dma->fifo_regs->tfcntl, 0x7);
|
|
|
|
/* Lookup the IRQ numbers */
|
|
psc_dma->playback.irq =
|
|
bcom_get_task_irq(psc_dma->playback.bcom_task);
|
|
psc_dma->capture.irq =
|
|
bcom_get_task_irq(psc_dma->capture.bcom_task);
|
|
|
|
rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED,
|
|
"psc-dma-status", psc_dma);
|
|
rc |= request_irq(psc_dma->capture.irq,
|
|
&psc_dma_bcom_irq_rx, IRQF_SHARED,
|
|
"psc-dma-capture", &psc_dma->capture);
|
|
rc |= request_irq(psc_dma->playback.irq,
|
|
&psc_dma_bcom_irq_tx, IRQF_SHARED,
|
|
"psc-dma-playback", &psc_dma->playback);
|
|
if (rc) {
|
|
ret = -ENODEV;
|
|
goto out_irq;
|
|
}
|
|
|
|
/* Save what we've done so it can be found again later */
|
|
dev_set_drvdata(&op->dev, psc_dma);
|
|
|
|
/* Tell the ASoC OF helpers about it */
|
|
return snd_soc_register_platform(&mpc5200_audio_dma_platform);
|
|
out_irq:
|
|
free_irq(psc_dma->irq, psc_dma);
|
|
free_irq(psc_dma->capture.irq, &psc_dma->capture);
|
|
free_irq(psc_dma->playback.irq, &psc_dma->playback);
|
|
out_free:
|
|
kfree(psc_dma);
|
|
out_unmap:
|
|
iounmap(regs);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);
|
|
|
|
int mpc5200_audio_dma_destroy(struct of_device *op)
|
|
{
|
|
struct psc_dma *psc_dma = dev_get_drvdata(&op->dev);
|
|
|
|
dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n");
|
|
|
|
snd_soc_unregister_platform(&mpc5200_audio_dma_platform);
|
|
|
|
bcom_gen_bd_rx_release(psc_dma->capture.bcom_task);
|
|
bcom_gen_bd_tx_release(psc_dma->playback.bcom_task);
|
|
|
|
/* Release irqs */
|
|
free_irq(psc_dma->irq, psc_dma);
|
|
free_irq(psc_dma->capture.irq, &psc_dma->capture);
|
|
free_irq(psc_dma->playback.irq, &psc_dma->playback);
|
|
|
|
iounmap(psc_dma->psc_regs);
|
|
kfree(psc_dma);
|
|
dev_set_drvdata(&op->dev, NULL);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy);
|
|
|
|
MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
|
|
MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
|
|
MODULE_LICENSE("GPL");
|