--- /dev/null
+/*
+ * Freescale MPC5200 PSC DMA
+ * ALSA SoC Platform driver
+ *
+ * Copyright (C) 2008 Secret Lab Technologies Ltd.
+ * Copyright (C) 2009 Jon Smirl, Digispeaker
+ */
+
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+
+#include <sound/soc.h>
+
+#include <linux/fsl/bestcomm/bestcomm.h>
+#include <linux/fsl/bestcomm/gen_bd.h>
+#include <asm/mpc52xx_psc.h>
+
+#include "mpc5200_dma.h"
+
+/*
+ * 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 */
+ if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
+ psc_dma->stats.underrun_count++;
+
+ /* Capture overrun error */
+ if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
+ 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
+ * @s: pointer to stream private data structure
+ *
+ * Enqueues another audio period buffer into the bestcomm queue.
+ *
+ * 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
+ */
+static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
+{
+ struct bcom_bd *bd;
+
+ /* Prepare and enqueue the next buffer descriptor */
+ bd = bcom_prepare_next_buffer(s->bcom_task);
+ bd->status = s->period_bytes;
+ bd->data[0] = s->runtime->dma_addr + (s->period_next * s->period_bytes);
+ bcom_submit_next_buffer(s->bcom_task, NULL);
+
+ /* Update for next period */
+ s->period_next = (s->period_next + 1) % s->runtime->periods;
+}
+
+/* Bestcomm DMA irq handler */
+static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream)
+{
+ struct psc_dma_stream *s = _psc_dma_stream;
+
+ spin_lock(&s->psc_dma->lock);
+ /* For each finished period, dequeue the completed period buffer
+ * and enqueue a new one in it's place. */
+ while (bcom_buffer_done(s->bcom_task)) {
+ bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
+
+ s->period_current = (s->period_current+1) % s->runtime->periods;
+ s->period_count++;
+
+ psc_dma_bcom_enqueue_next_buffer(s);
+ }
+ spin_unlock(&s->psc_dma->lock);
+
+ /* If the stream is active, then also inform the PCM middle layer
+ * of the period finished event. */
+ if (s->active)
+ snd_pcm_period_elapsed(s->stream);
+
+ return IRQ_HANDLED;
+}
+
+static int psc_dma_hw_free(struct snd_pcm_substream *substream)
+{
+ snd_pcm_set_runtime_buffer(substream, NULL);
+ return 0;
+}
+
+/**
+ * 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.
+ */
+static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
+ struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
+ u16 imr;
+ unsigned long flags;
+ int i;
+
+ switch (cmd) {
+ 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);
+ s->period_next = 0;
+ s->period_current = 0;
+ s->active = 1;
+ s->period_count = 0;
+ s->runtime = runtime;
+
+ /* Fill up the bestcomm bd queue and enable DMA.
+ * This will begin filling the PSC's fifo.
+ */
+ spin_lock_irqsave(&psc_dma->lock, flags);
+
+ if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
+ bcom_gen_bd_rx_reset(s->bcom_task);
+ else
+ 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);
+ 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);
+ s->active = 0;
+
+ spin_lock_irqsave(&psc_dma->lock, flags);
+ bcom_disable(s->bcom_task);
+ if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
+ bcom_gen_bd_rx_reset(s->bcom_task);
+ else
+ bcom_gen_bd_tx_reset(s->bcom_task);
+ 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;
+}
+
+
+/* ---------------------------------------------------------------------
+ * The PSC DMA 'ASoC platform' driver
+ *
+ * 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 |
+ SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
+ SNDRV_PCM_INFO_BATCH,
+ .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |
+ SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
+ .period_bytes_max = 1024 * 1024,
+ .period_bytes_min = 32,
+ .periods_min = 2,
+ .periods_max = 256,
+ .buffer_bytes_max = 2 * 1024 * 1024,
+ .fifo_size = 512,
+};
+
+static int psc_dma_open(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ 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;
+ int rc;
+
+ dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream);
+
+ if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
+ s = &psc_dma->capture;
+ else
+ s = &psc_dma->playback;
+
+ snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware);
+
+ rc = snd_pcm_hw_constraint_integer(runtime,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+ if (rc < 0) {
+ dev_err(substream->pcm->card->dev, "invalid buffer size\n");
+ return rc;
+ }
+
+ s->stream = substream;
+ return 0;
+}
+
+static int psc_dma_close(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;
+
+ dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream);
+
+ if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
+ s = &psc_dma->capture;
+ else
+ s = &psc_dma->playback;
+
+ if (!psc_dma->playback.active &&
+ !psc_dma->capture.active) {
+
+ /* Disable all interrupts and reset the PSC */
+ out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
+ out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
+ }
+ s->stream = NULL;
+ return 0;
+}
+
+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
+ s = &psc_dma->playback;
+
+ 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 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_dai *dai = rtd->cpu_dai;
+ struct snd_pcm *pcm = rtd->pcm;
+ struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
+ size_t size = psc_dma_hardware.buffer_bytes_max;
+ int rc;
+
+ dev_dbg(rtd->platform->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_pcm_substream *substream;
+ int stream;
+
+ dev_dbg(rtd->platform->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 struct snd_soc_platform_driver mpc5200_audio_dma_platform = {
+ .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 snd_soc_register_platform(&op->dev, &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 platform_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(&op->dev);
+
+ 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");
Code Review / kvmfornfv.git / blobdiff