/*
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* Freescale MPC5200 PSC DMA
|
* 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
|
*/
|
|
#include <linux/module.h>
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#include <linux/of_device.h>
|
#include <linux/dma-mapping.h>
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#include <linux/slab.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
|
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#include <sound/soc.h>
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#include <linux/fsl/bestcomm/bestcomm.h>
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#include <linux/fsl/bestcomm/gen_bd.h>
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#include <asm/mpc52xx_psc.h>
|
|
#include "mpc5200_dma.h"
|
|
#define DRV_NAME "mpc5200_dma"
|
|
/*
|
* Interrupt handlers
|
*/
|
static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma)
|
{
|
struct psc_dma *psc_dma = _psc_dma;
|
struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
|
u16 isr;
|
|
isr = in_be16(®s->mpc52xx_psc_isr);
|
|
/* Playback underrun error */
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if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
|
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++;
|
|
out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT);
|
|
return IRQ_HANDLED;
|
}
|
|
/**
|
* 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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*
|
* Note: The routine must only be called when there is space available in
|
* the queue. Otherwise the enqueue will fail and the audio ring buffer
|
* 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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struct bcom_bd *bd;
|
|
/* 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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/* Bestcomm DMA irq handler */
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static irqreturn_t psc_dma_bcom_irq(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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s->period_count++;
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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)
|
{
|
snd_pcm_set_runtime_buffer(substream, NULL);
|
return 0;
|
}
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|
/**
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* psc_dma_trigger: start and stop the DMA transfer.
|
*
|
* This function is called by ALSA to start, stop, pause, and resume the DMA
|
* transfer of data.
|
*/
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static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
|
{
|
struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
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struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
|
u16 imr;
|
unsigned long flags;
|
int i;
|
|
switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
|
dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n",
|
substream->pstr->stream, runtime->frame_bits,
|
(int)runtime->period_size, runtime->periods);
|
s->period_bytes = frames_to_bytes(runtime,
|
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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s->period_count = 0;
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s->runtime = runtime;
|
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/* Fill up the bestcomm bd queue and enable DMA.
|
* This will begin filling the PSC's fifo.
|
*/
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spin_lock_irqsave(&psc_dma->lock, flags);
|
|
if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
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bcom_gen_bd_rx_reset(s->bcom_task);
|
else
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bcom_gen_bd_tx_reset(s->bcom_task);
|
|
for (i = 0; i < runtime->periods; i++)
|
if (!bcom_queue_full(s->bcom_task))
|
psc_dma_bcom_enqueue_next_buffer(s);
|
|
bcom_enable(s->bcom_task);
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spin_unlock_irqrestore(&psc_dma->lock, flags);
|
|
out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT);
|
|
break;
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n",
|
substream->pstr->stream, s->period_count);
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s->active = 0;
|
|
spin_lock_irqsave(&psc_dma->lock, flags);
|
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);
|
|
break;
|
|
default:
|
dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n",
|
substream->pstr->stream, cmd);
|
return -EINVAL;
|
}
|
|
/* Update interrupt enable settings */
|
imr = 0;
|
if (psc_dma->playback.active)
|
imr |= MPC52xx_PSC_IMR_TXEMP;
|
if (psc_dma->capture.active)
|
imr |= MPC52xx_PSC_IMR_ORERR;
|
out_be16(®s->isr_imr.imr, psc_dma->imr | imr);
|
|
return 0;
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}
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|
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/* ---------------------------------------------------------------------
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* The PSC DMA 'ASoC platform' driver
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*
|
* Can be referenced by an 'ASoC machine' driver
|
* This driver only deals with the audio bus; it doesn't have any
|
* interaction with the attached codec
|
*/
|
|
static const struct snd_pcm_hardware psc_dma_hardware = {
|
.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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.period_bytes_max = 1024 * 1024,
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.period_bytes_min = 32,
|
.periods_min = 2,
|
.periods_max = 256,
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.buffer_bytes_max = 2 * 1024 * 1024,
|
.fifo_size = 512,
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};
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|
static int psc_dma_open(struct snd_pcm_substream *substream)
|
{
|
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 = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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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;
|
else
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s = &psc_dma->playback;
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|
snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware);
|
|
rc = snd_pcm_hw_constraint_integer(runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
|
if (rc < 0) {
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dev_err(substream->pcm->card->dev, "invalid buffer size\n");
|
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)
|
{
|
struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
|
struct psc_dma_stream *s;
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|
dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream);
|
|
if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
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s = &psc_dma->capture;
|
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) {
|
|
/* Disable all interrupts and reset the PSC */
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out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
|
out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
|
}
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s->stream = NULL;
|
return 0;
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}
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|
static snd_pcm_uframes_t
|
psc_dma_pointer(struct snd_pcm_substream *substream)
|
{
|
struct snd_soc_pcm_runtime *rtd = substream->private_data;
|
struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
|
struct psc_dma_stream *s;
|
dma_addr_t count;
|
|
if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
|
s = &psc_dma->capture;
|
else
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s = &psc_dma->playback;
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|
count = s->period_current * s->period_bytes;
|
|
return bytes_to_frames(substream->runtime, count);
|
}
|
|
static int
|
psc_dma_hw_params(struct snd_pcm_substream *substream,
|
struct snd_pcm_hw_params *params)
|
{
|
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
|
|
return 0;
|
}
|
|
static const struct snd_pcm_ops psc_dma_ops = {
|
.open = psc_dma_open,
|
.close = psc_dma_close,
|
.hw_free = psc_dma_hw_free,
|
.ioctl = snd_pcm_lib_ioctl,
|
.pointer = psc_dma_pointer,
|
.trigger = psc_dma_trigger,
|
.hw_params = psc_dma_hw_params,
|
};
|
|
static int psc_dma_new(struct snd_soc_pcm_runtime *rtd)
|
{
|
struct snd_card *card = rtd->card->snd_card;
|
struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
|
struct snd_soc_dai *dai = rtd->cpu_dai;
|
struct snd_pcm *pcm = rtd->pcm;
|
size_t size = psc_dma_hardware.buffer_bytes_max;
|
int rc;
|
|
dev_dbg(component->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n",
|
card, dai, pcm);
|
|
rc = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
|
if (rc)
|
return rc;
|
|
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
|
rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
|
size, &pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
|
if (rc)
|
goto playback_alloc_err;
|
}
|
|
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
|
rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
|
size, &pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->dma_buffer);
|
if (rc)
|
goto capture_alloc_err;
|
}
|
|
return 0;
|
|
capture_alloc_err:
|
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
|
snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
|
|
playback_alloc_err:
|
dev_err(card->dev, "Cannot allocate buffer(s)\n");
|
|
return -ENOMEM;
|
}
|
|
static void psc_dma_free(struct snd_pcm *pcm)
|
{
|
struct snd_soc_pcm_runtime *rtd = pcm->private_data;
|
struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
|
struct snd_pcm_substream *substream;
|
int stream;
|
|
dev_dbg(component->dev, "psc_dma_free(pcm=%p)\n", pcm);
|
|
for (stream = 0; stream < 2; stream++) {
|
substream = pcm->streams[stream].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 mpc5200_audio_dma_component = {
|
.name = DRV_NAME,
|
.ops = &psc_dma_ops,
|
.pcm_new = &psc_dma_new,
|
.pcm_free = &psc_dma_free,
|
};
|
|
int mpc5200_audio_dma_create(struct platform_device *op)
|
{
|
phys_addr_t fifo;
|
struct psc_dma *psc_dma;
|
struct resource res;
|
int size, irq, rc;
|
const __be32 *prop;
|
void __iomem *regs;
|
int ret;
|
|
/* Fetch the registers and IRQ of the PSC */
|
irq = irq_of_parse_and_map(op->dev.of_node, 0);
|
if (of_address_to_resource(op->dev.of_node, 0, &res)) {
|
dev_err(&op->dev, "Missing reg property\n");
|
return -ENODEV;
|
}
|
regs = ioremap(res.start, resource_size(&res));
|
if (!regs) {
|
dev_err(&op->dev, "Could not map registers\n");
|
return -ENODEV;
|
}
|
|
/* Allocate and initialize the driver private data */
|
psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
|
if (!psc_dma) {
|
ret = -ENOMEM;
|
goto out_unmap;
|
}
|
|
/* Get the PSC ID */
|
prop = of_get_property(op->dev.of_node, "cell-index", &size);
|
if (!prop || size < sizeof *prop) {
|
ret = -ENODEV;
|
goto out_free;
|
}
|
|
spin_lock_init(&psc_dma->lock);
|
mutex_init(&psc_dma->mutex);
|
psc_dma->id = be32_to_cpu(*prop);
|
psc_dma->irq = irq;
|
psc_dma->psc_regs = regs;
|
psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs;
|
psc_dma->dev = &op->dev;
|
psc_dma->playback.psc_dma = psc_dma;
|
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, IRQF_SHARED,
|
"psc-dma-capture", &psc_dma->capture);
|
rc |= request_irq(psc_dma->playback.irq, &psc_dma_bcom_irq, 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 devm_snd_soc_register_component(&op->dev,
|
&mpc5200_audio_dma_component, NULL, 0);
|
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 platform_device *op)
|
{
|
struct psc_dma *psc_dma = dev_get_drvdata(&op->dev);
|
|
dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n");
|
|
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");
|
