| /* |
| * 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/slab.h> |
| #include <linux/of_platform.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(®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, |
| .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 = 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 u64 psc_dma_dmamask = DMA_BIT_MASK(32); |
| 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 = 0; |
| |
| dev_dbg(rtd->platform->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 = DMA_BIT_MASK(32); |
| |
| 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; |
| } |
| |
| if (rtd->codec->ac97) |
| rtd->codec->ac97->private_data = psc_dma; |
| |
| 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, |
| }; |
| |
| static int mpc5200_hpcd_probe(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; |
| } |
| |
| static int mpc5200_hpcd_remove(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; |
| } |
| |
| static struct of_device_id mpc5200_hpcd_match[] = { |
| { .compatible = "fsl,mpc5200-pcm", }, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(of, mpc5200_hpcd_match); |
| |
| static struct platform_driver mpc5200_hpcd_of_driver = { |
| .probe = mpc5200_hpcd_probe, |
| .remove = mpc5200_hpcd_remove, |
| .driver = { |
| .owner = THIS_MODULE, |
| .name = "mpc5200-pcm-audio", |
| .of_match_table = mpc5200_hpcd_match, |
| } |
| }; |
| |
| module_platform_driver(mpc5200_hpcd_of_driver); |
| |
| MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); |
| MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver"); |
| MODULE_LICENSE("GPL"); |