/* * Generic TXx9 ACLC platform driver * * Copyright (C) 2009 Atsushi Nemoto * * Based on RBTX49xx patch from CELF patch archive. * (C) Copyright TOSHIBA CORPORATION 2004-2006 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/module.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/scatterlist.h> #include <linux/slab.h> #include <linux/dmaengine.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> #include "txx9aclc.h" static struct txx9aclc_soc_device { struct txx9aclc_dmadata dmadata[2]; } txx9aclc_soc_device; /* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */ static struct txx9aclc_plat_drvdata *txx9aclc_drvdata; static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev, struct txx9aclc_dmadata *dmadata); static const struct snd_pcm_hardware txx9aclc_pcm_hardware = { /* * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID * needs more works for noncoherent MIPS. */ .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH | SNDRV_PCM_INFO_PAUSE, .period_bytes_min = 1024, .period_bytes_max = 8 * 1024, .periods_min = 2, .periods_max = 4096, .buffer_bytes_max = 32 * 1024, }; static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; struct txx9aclc_dmadata *dmadata = runtime->private_data; int ret; ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); if (ret < 0) return ret; dev_dbg(rtd->platform->dev, "runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd " "runtime->min_align %ld\n", (unsigned long)runtime->dma_area, (unsigned long)runtime->dma_addr, runtime->dma_bytes, runtime->min_align); dev_dbg(rtd->platform->dev, "periods %d period_bytes %d stream %d\n", params_periods(params), params_period_bytes(params), substream->stream); dmadata->substream = substream; dmadata->pos = 0; return 0; } static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream) { return snd_pcm_lib_free_pages(substream); } static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct txx9aclc_dmadata *dmadata = runtime->private_data; dmadata->dma_addr = runtime->dma_addr; dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream); dmadata->period_bytes = snd_pcm_lib_period_bytes(substream); if (dmadata->buffer_bytes == dmadata->period_bytes) { dmadata->frag_bytes = dmadata->period_bytes >> 1; dmadata->frags = 2; } else { dmadata->frag_bytes = dmadata->period_bytes; dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes; } dmadata->frag_count = 0; dmadata->pos = 0; return 0; } static void txx9aclc_dma_complete(void *arg) { struct txx9aclc_dmadata *dmadata = arg; unsigned long flags; /* dma completion handler cannot submit new operations */ spin_lock_irqsave(&dmadata->dma_lock, flags); if (dmadata->frag_count >= 0) { dmadata->dmacount--; if (!WARN_ON(dmadata->dmacount < 0)) tasklet_schedule(&dmadata->tasklet); } spin_unlock_irqrestore(&dmadata->dma_lock, flags); } static struct dma_async_tx_descriptor * txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr) { struct dma_chan *chan = dmadata->dma_chan; struct dma_async_tx_descriptor *desc; struct scatterlist sg; sg_init_table(&sg, 1); sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)), dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1)); sg_dma_address(&sg) = buf_dma_addr; desc = dmaengine_prep_slave_sg(chan, &sg, 1, dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { dev_err(&chan->dev->device, "cannot prepare slave dma\n"); return NULL; } desc->callback = txx9aclc_dma_complete; desc->callback_param = dmadata; dmaengine_submit(desc); return desc; } #define NR_DMA_CHAIN 2 static void txx9aclc_dma_tasklet(unsigned long data) { struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data; struct dma_chan *chan = dmadata->dma_chan; struct dma_async_tx_descriptor *desc; struct snd_pcm_substream *substream = dmadata->substream; u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? ACCTL_AUDODMA : ACCTL_AUDIDMA; int i; unsigned long flags; spin_lock_irqsave(&dmadata->dma_lock, flags); if (dmadata->frag_count < 0) { struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata; void __iomem *base = drvdata->base; spin_unlock_irqrestore(&dmadata->dma_lock, flags); dmaengine_terminate_all(chan); /* first time */ for (i = 0; i < NR_DMA_CHAIN; i++) { desc = txx9aclc_dma_submit(dmadata, dmadata->dma_addr + i * dmadata->frag_bytes); if (!desc) return; } dmadata->dmacount = NR_DMA_CHAIN; dma_async_issue_pending(chan); spin_lock_irqsave(&dmadata->dma_lock, flags); __raw_writel(ctlbit, base + ACCTLEN); dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags; spin_unlock_irqrestore(&dmadata->dma_lock, flags); return; } if (WARN_ON(dmadata->dmacount >= NR_DMA_CHAIN)) { spin_unlock_irqrestore(&dmadata->dma_lock, flags); return; } while (dmadata->dmacount < NR_DMA_CHAIN) { dmadata->dmacount++; spin_unlock_irqrestore(&dmadata->dma_lock, flags); desc = txx9aclc_dma_submit(dmadata, dmadata->dma_addr + dmadata->frag_count * dmadata->frag_bytes); if (!desc) return; dma_async_issue_pending(chan); spin_lock_irqsave(&dmadata->dma_lock, flags); dmadata->frag_count++; dmadata->frag_count %= dmadata->frags; dmadata->pos += dmadata->frag_bytes; dmadata->pos %= dmadata->buffer_bytes; if ((dmadata->frag_count * dmadata->frag_bytes) % dmadata->period_bytes == 0) snd_pcm_period_elapsed(substream); } spin_unlock_irqrestore(&dmadata->dma_lock, flags); } static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd) { struct txx9aclc_dmadata *dmadata = substream->runtime->private_data; struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata; void __iomem *base = drvdata->base; unsigned long flags; int ret = 0; u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? ACCTL_AUDODMA : ACCTL_AUDIDMA; spin_lock_irqsave(&dmadata->dma_lock, flags); switch (cmd) { case SNDRV_PCM_TRIGGER_START: dmadata->frag_count = -1; tasklet_schedule(&dmadata->tasklet); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: case SNDRV_PCM_TRIGGER_SUSPEND: __raw_writel(ctlbit, base + ACCTLDIS); break; case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: case SNDRV_PCM_TRIGGER_RESUME: __raw_writel(ctlbit, base + ACCTLEN); break; default: ret = -EINVAL; } spin_unlock_irqrestore(&dmadata->dma_lock, flags); return ret; } static snd_pcm_uframes_t txx9aclc_pcm_pointer(struct snd_pcm_substream *substream) { struct txx9aclc_dmadata *dmadata = substream->runtime->private_data; return bytes_to_frames(substream->runtime, dmadata->pos); } static int txx9aclc_pcm_open(struct snd_pcm_substream *substream) { struct txx9aclc_soc_device *dev = &txx9aclc_soc_device; struct txx9aclc_dmadata *dmadata = &dev->dmadata[substream->stream]; int ret; ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware); if (ret) return ret; /* ensure that buffer size is a multiple of period size */ ret = snd_pcm_hw_constraint_integer(substream->runtime, SNDRV_PCM_HW_PARAM_PERIODS); if (ret < 0) return ret; substream->runtime->private_data = dmadata; return 0; } static int txx9aclc_pcm_close(struct snd_pcm_substream *substream) { struct txx9aclc_dmadata *dmadata = substream->runtime->private_data; struct dma_chan *chan = dmadata->dma_chan; dmadata->frag_count = -1; dmaengine_terminate_all(chan); return 0; } static struct snd_pcm_ops txx9aclc_pcm_ops = { .open = txx9aclc_pcm_open, .close = txx9aclc_pcm_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = txx9aclc_pcm_hw_params, .hw_free = txx9aclc_pcm_hw_free, .prepare = txx9aclc_pcm_prepare, .trigger = txx9aclc_pcm_trigger, .pointer = txx9aclc_pcm_pointer, }; static int txx9aclc_pcm_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 platform_device *pdev = to_platform_device(rtd->platform->dev); struct txx9aclc_soc_device *dev; struct resource *r; int i; int ret; /* at this point onwards the AC97 component has probed and this will be valid */ dev = snd_soc_dai_get_drvdata(dai); dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK; dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE; for (i = 0; i < 2; i++) { r = platform_get_resource(pdev, IORESOURCE_DMA, i); if (!r) { ret = -EBUSY; goto exit; } dev->dmadata[i].dma_res = r; ret = txx9aclc_dma_init(dev, &dev->dmadata[i]); if (ret) goto exit; } return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, card->dev, 64 * 1024, 4 * 1024 * 1024); exit: for (i = 0; i < 2; i++) { if (dev->dmadata[i].dma_chan) dma_release_channel(dev->dmadata[i].dma_chan); dev->dmadata[i].dma_chan = NULL; } return ret; } static bool filter(struct dma_chan *chan, void *param) { struct txx9aclc_dmadata *dmadata = param; char *devname; bool found = false; devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name, (int)dmadata->dma_res->start); if (strcmp(dev_name(chan->device->dev), devname) == 0) { chan->private = &dmadata->dma_slave; found = true; } kfree(devname); return found; } static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev, struct txx9aclc_dmadata *dmadata) { struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata; struct txx9dmac_slave *ds = &dmadata->dma_slave; dma_cap_mask_t mask; spin_lock_init(&dmadata->dma_lock); ds->reg_width = sizeof(u32); if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) { ds->tx_reg = drvdata->physbase + ACAUDODAT; ds->rx_reg = 0; } else { ds->tx_reg = 0; ds->rx_reg = drvdata->physbase + ACAUDIDAT; } /* Try to grab a DMA channel */ dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); dmadata->dma_chan = dma_request_channel(mask, filter, dmadata); if (!dmadata->dma_chan) { printk(KERN_ERR "DMA channel for %s is not available\n", dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ? "playback" : "capture"); return -EBUSY; } tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet, (unsigned long)dmadata); return 0; } static int txx9aclc_pcm_probe(struct snd_soc_platform *platform) { snd_soc_platform_set_drvdata(platform, &txx9aclc_soc_device); return 0; } static int txx9aclc_pcm_remove(struct snd_soc_platform *platform) { struct txx9aclc_soc_device *dev = snd_soc_platform_get_drvdata(platform); struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata; void __iomem *base = drvdata->base; int i; /* disable all FIFO DMAs */ __raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS); /* dummy R/W to clear pending DMAREQ if any */ __raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT); for (i = 0; i < 2; i++) { struct txx9aclc_dmadata *dmadata = &dev->dmadata[i]; struct dma_chan *chan = dmadata->dma_chan; if (chan) { dmadata->frag_count = -1; dmaengine_terminate_all(chan); dma_release_channel(chan); } dev->dmadata[i].dma_chan = NULL; } return 0; } static struct snd_soc_platform_driver txx9aclc_soc_platform = { .probe = txx9aclc_pcm_probe, .remove = txx9aclc_pcm_remove, .ops = &txx9aclc_pcm_ops, .pcm_new = txx9aclc_pcm_new, }; static int txx9aclc_soc_platform_probe(struct platform_device *pdev) { return devm_snd_soc_register_platform(&pdev->dev, &txx9aclc_soc_platform); } static struct platform_driver txx9aclc_pcm_driver = { .driver = { .name = "txx9aclc-pcm-audio", }, .probe = txx9aclc_soc_platform_probe, }; module_platform_driver(txx9aclc_pcm_driver); MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>"); MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver"); MODULE_LICENSE("GPL");