1 files changed, 564 insertions, 0 deletions

diff --git a/sound/soc/fsl/mpc5200_dma.c b/sound/soc/fsl/mpc5200_dma.c
new file mode 100644
index 000000000000..efec33a1c5bd
--- /dev/null
+++ b/sound/soc/fsl/mpc5200_dma.c
@@ -0,0 +1,564 @@
+/*
+ * 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 <sound/soc.h>
+
+#include <sysdev/bestcomm/bestcomm.h>
+#include <sysdev/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(&regs->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(&regs->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->period_next_pt;
+        bcom_submit_next_buffer(s->bcom_task, NULL);
+
+        /* Update for next period */
+        s->period_next_pt += s->period_bytes;
+        if (s->period_next_pt >= s->period_end)
+                s->period_next_pt = s->period_start;
+}
+
+static void psc_dma_bcom_enqueue_tx(struct psc_dma_stream *s)
+{
+        while (s->appl_ptr < s->runtime->control->appl_ptr) {
+
+                if (bcom_queue_full(s->bcom_task))
+                        return;
+
+                s->appl_ptr += s->period_size;
+
+                psc_dma_bcom_enqueue_next_buffer(s);
+        }
+}
+
+/* Bestcomm DMA irq handler */
+static irqreturn_t psc_dma_bcom_irq_tx(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_pt += s->period_bytes;
+                if (s->period_current_pt >= s->period_end)
+                        s->period_current_pt = s->period_start;
+        }
+        psc_dma_bcom_enqueue_tx(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 irqreturn_t psc_dma_bcom_irq_rx(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_pt += s->period_bytes;
+                if (s->period_current_pt >= s->period_end)
+                        s->period_current_pt = s->period_start;
+
+                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 = rtd->dai->cpu_dai->private_data;
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct psc_dma_stream *s;
+        struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
+        u16 imr;
+        unsigned long flags;
+        int i;
+
+        if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
+                s = &psc_dma->capture;
+        else
+                s = &psc_dma->playback;
+
+        dev_dbg(psc_dma->dev, "psc_dma_trigger(substream=%p, cmd=%i)"
+                " stream_id=%i\n",
+                substream, cmd, substream->pstr->stream);
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+                s->period_bytes = frames_to_bytes(runtime,
+                                                  runtime->period_size);
+                s->period_start = virt_to_phys(runtime->dma_area);
+                s->period_end = s->period_start +
+                                (s->period_bytes * runtime->periods);
+                s->period_next_pt = s->period_start;
+                s->period_current_pt = s->period_start;
+                s->period_size = runtime->period_size;
+                s->active = 1;
+
+                /* track appl_ptr so that we have a better chance of detecting
+                 * end of stream and not over running it.
+                 */
+                s->runtime = runtime;
+                s->appl_ptr = s->runtime->control->appl_ptr -
+                                (runtime->period_size * runtime->periods);
+
+                /* 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);
+                        for (i = 0; i < runtime->periods; i++)
+                                if (!bcom_queue_full(s->bcom_task))
+                                        psc_dma_bcom_enqueue_next_buffer(s);
+                } else {
+                        bcom_gen_bd_tx_reset(s->bcom_task);
+                        psc_dma_bcom_enqueue_tx(s);
+                }
+
+                bcom_enable(s->bcom_task);
+                spin_unlock_irqrestore(&psc_dma->lock, flags);
+
+                out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
+
+                break;
+
+        case SNDRV_PCM_TRIGGER_STOP:
+                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, "invalid command\n");
+                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(&regs->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,
+        .rate_min = 8000,
+        .rate_max = 48000,
+        .channels_min = 1,
+        .channels_max = 2,
+        .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 = rtd->dai->cpu_dai->private_data;
+        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 = rtd->dai->cpu_dai->private_data;
+        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 = rtd->dai->cpu_dai->private_data;
+        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_pt - s->period_start;
+
+        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 u64 psc_dma_dmamask = 0xffffffff;
+static int psc_dma_new(struct snd_card *card, struct snd_soc_dai *dai,
+                           struct snd_pcm *pcm)
+{
+        struct snd_soc_pcm_runtime *rtd = pcm->private_data;
+        struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
+        size_t size = psc_dma_hardware.buffer_bytes_max;
+        int rc = 0;
+
+        dev_dbg(rtd->socdev->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n",
+                card, dai, pcm);
+
+        if (!card->dev->dma_mask)
+                card->dev->dma_mask = &psc_dma_dmamask;
+        if (!card->dev->coherent_dma_mask)
+                card->dev->coherent_dma_mask = 0xffffffff;
+
+        if (pcm->streams[0].substream) {
+                rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
+                                size, &pcm->streams[0].substream->dma_buffer);
+                if (rc)
+                        goto playback_alloc_err;
+        }
+
+        if (pcm->streams[1].substream) {
+                rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
+                                size, &pcm->streams[1].substream->dma_buffer);
+                if (rc)
+                        goto capture_alloc_err;
+        }
+
+        if (rtd->socdev->card->codec->ac97)
+                rtd->socdev->card->codec->ac97->private_data = psc_dma;
+
+        return 0;
+
+ capture_alloc_err:
+        if (pcm->streams[0].substream)
+                snd_dma_free_pages(&pcm->streams[0].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->socdev->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;
+                }
+        }
+}
+
+struct snd_soc_platform mpc5200_audio_dma_platform = {
+        .name           = "mpc5200-psc-audio",
+        .pcm_ops        = &psc_dma_ops,
+        .pcm_new        = &psc_dma_new,
+        .pcm_free       = &psc_dma_free,
+};
+EXPORT_SYMBOL_GPL(mpc5200_audio_dma_platform);
+
+int mpc5200_audio_dma_create(struct of_device *op)
+{
+        phys_addr_t fifo;
+        struct psc_dma *psc_dma;
+        struct resource res;
+        int size, irq, rc;
+        const __be32 *prop;
+        void __iomem *regs;
+
+        /* Fetch the registers and IRQ of the PSC */
+        irq = irq_of_parse_and_map(op->node, 0);
+        if (of_address_to_resource(op->node, 0, &res)) {
+                dev_err(&op->dev, "Missing reg property\n");
+                return -ENODEV;
+        }
+        regs = ioremap(res.start, 1 + res.end - res.start);
+        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) {
+                iounmap(regs);
+                return -ENOMEM;
+        }
+
+        /* Get the PSC ID */
+        prop = of_get_property(op->node, "cell-index", &size);
+        if (!prop || size < sizeof *prop)
+                return -ENODEV;
+
+        spin_lock_init(&psc_dma->lock);
+        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");
+                iounmap(regs);
+                kfree(psc_dma);
+                return -ENODEV;
+        }
+
+        /* 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) {
+                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);
+                return -ENODEV;
+        }
+
+        /* 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);
+}
+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");