ASoC: Add TXx9 AC link controller driver (v3)
This patch adds support for the integrated ACLC of the TXx9 family.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/txx9/txx9aclc.c b/sound/soc/txx9/txx9aclc.c
new file mode 100644
index 0000000..fa33661
--- /dev/null
+++ b/sound/soc/txx9/txx9aclc.c
@@ -0,0 +1,430 @@
+/*
+ * 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 <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include "txx9aclc.h"
+
+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,
+#ifdef __BIG_ENDIAN
+ .formats = SNDRV_PCM_FMTBIT_S16_BE,
+#else
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+#endif
+ .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_soc_device *socdev = rtd->socdev;
+ 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(socdev->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(socdev->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--;
+ BUG_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 = chan->device->device_prep_slave_sg(chan, &sg, 1,
+ dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE,
+ 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;
+ desc->tx_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_soc_device *dev =
+ container_of(dmadata, struct txx9aclc_soc_device,
+ dmadata[substream->stream]);
+ struct txx9aclc_plat_drvdata *drvdata =
+ txx9aclc_get_plat_drvdata(dev);
+ void __iomem *base = drvdata->base;
+
+ spin_unlock_irqrestore(&dmadata->dma_lock, flags);
+ chan->device->device_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;
+ chan->device->device_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;
+ }
+ BUG_ON(dmadata->dmacount >= NR_DMA_CHAIN);
+ 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;
+ chan->device->device_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 snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct txx9aclc_soc_device *dev =
+ container_of(rtd->socdev, struct txx9aclc_soc_device, soc_dev);
+ struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
+ 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 snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct txx9aclc_soc_device *dev =
+ container_of(rtd->socdev, struct txx9aclc_soc_device, soc_dev);
+ 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;
+ chan->device->device_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 void txx9aclc_pcm_free_dma_buffers(struct snd_pcm *pcm)
+{
+ snd_pcm_lib_preallocate_free_for_all(pcm);
+}
+
+static int txx9aclc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
+ struct snd_pcm *pcm)
+{
+ return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
+ card->dev, 64 * 1024, 4 * 1024 * 1024);
+}
+
+static bool filter(struct dma_chan *chan, void *param)
+{
+ struct txx9aclc_dmadata *dmadata = param;
+ char devname[BUS_ID_SIZE + 2];
+
+ sprintf(devname, "%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;
+ return true;
+ }
+ return false;
+}
+
+static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
+ struct txx9aclc_dmadata *dmadata)
+{
+ struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
+ 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) {
+ dev_err(dev->soc_dev.dev,
+ "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 platform_device *pdev)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct txx9aclc_soc_device *dev =
+ container_of(socdev, struct txx9aclc_soc_device, soc_dev);
+ struct resource *r;
+ int i;
+ int ret;
+
+ 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(dev->aclc_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 0;
+
+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 int txx9aclc_pcm_remove(struct platform_device *pdev)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct txx9aclc_soc_device *dev =
+ container_of(socdev, struct txx9aclc_soc_device, soc_dev);
+ struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
+ 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;
+ chan->device->device_terminate_all(chan);
+ dma_release_channel(chan);
+ }
+ dev->dmadata[i].dma_chan = NULL;
+ }
+ return 0;
+}
+
+struct snd_soc_platform txx9aclc_soc_platform = {
+ .name = "txx9aclc-audio",
+ .probe = txx9aclc_pcm_probe,
+ .remove = txx9aclc_pcm_remove,
+ .pcm_ops = &txx9aclc_pcm_ops,
+ .pcm_new = txx9aclc_pcm_new,
+ .pcm_free = txx9aclc_pcm_free_dma_buffers,
+};
+EXPORT_SYMBOL_GPL(txx9aclc_soc_platform);
+
+static int __init txx9aclc_soc_platform_init(void)
+{
+ return snd_soc_register_platform(&txx9aclc_soc_platform);
+}
+
+static void __exit txx9aclc_soc_platform_exit(void)
+{
+ snd_soc_unregister_platform(&txx9aclc_soc_platform);
+}
+
+module_init(txx9aclc_soc_platform_init);
+module_exit(txx9aclc_soc_platform_exit);
+
+MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
+MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
+MODULE_LICENSE("GPL");