Re: [alsa-devel] [PATCH V2 2/9] Basic split of mpc5200 DMA code out from mpc5200_psc_i2s

On Sat, May 23, 2009 at 5:12 PM, Jon Smirl jonsmirl@gmail.com wrote:

Basic split of mpc5200 DMA code out from i2s into a standalone file.

Signed-off-by: Jon Smirl jonsmirl@gmail.com

I haven't looked in detail, but I'm okay with this in principle.

Acked-by: Grant Likely grant.likely@secretlab.ca

g.

---

sound/soc/fsl/Kconfig           |    4  sound/soc/fsl/Makefile          |    2  sound/soc/fsl/mpc5200_dma.c     |  458 +++++++++++++++++++++++++++++++++++++  sound/soc/fsl/mpc5200_dma.h     |   81 +++++++  sound/soc/fsl/mpc5200_psc_i2s.c |  485 ---------------------------------------  5 files changed, 547 insertions(+), 483 deletions(-)  create mode 100644 sound/soc/fsl/mpc5200_dma.c  create mode 100644 sound/soc/fsl/mpc5200_dma.h

diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig index 9fc9082..dc79bdf 100644 --- a/sound/soc/fsl/Kconfig +++ b/sound/soc/fsl/Kconfig @@ -1,5 +1,8 @@  config SND_SOC_OF_SIMPLE        tristate

+config SND_MPC52xx_DMA

• tristate

# ASoC platform support for the Freescale MPC8610 SOC.  This compiles drivers  # for the SSI and the Elo DMA controller.  You will still need to select @@ -23,6 +26,7 @@ config SND_SOC_MPC5200_I2S        tristate "Freescale MPC5200 PSC in I2S mode driver"        depends on PPC_MPC52xx && PPC_BESTCOMM        select SND_SOC_OF_SIMPLE

• select SND_MPC52xx_DMA

select PPC_BESTCOMM_GEN_BD        help          Say Y here to support the MPC5200 PSCs in I2S mode. diff --git a/sound/soc/fsl/Makefile b/sound/soc/fsl/Makefile index f85134c..7731ef2 100644 --- a/sound/soc/fsl/Makefile +++ b/sound/soc/fsl/Makefile @@ -10,5 +10,7 @@ snd-soc-fsl-ssi-objs := fsl_ssi.o  snd-soc-fsl-dma-objs := fsl_dma.o  obj-$(CONFIG_SND_SOC_MPC8610) += snd-soc-fsl-ssi.o snd-soc-fsl-dma.o

+# MPC5200 Platform Support +obj-$(CONFIG_SND_MPC52xx_DMA) += mpc5200_dma.o  obj-$(CONFIG_SND_SOC_MPC5200_I2S) += mpc5200_psc_i2s.o

diff --git a/sound/soc/fsl/mpc5200_dma.c b/sound/soc/fsl/mpc5200_dma.c new file mode 100644 index 0000000..4bae8d6 --- /dev/null +++ b/sound/soc/fsl/mpc5200_dma.c @@ -0,0 +1,458 @@ +/*

• • Freescale MPC5200 PSC DMA
• • ALSA SoC Platform driver
• • Copyright (C) 2008 Secret Lab Technologies Ltd.
• */

+#include <linux/init.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/device.h> +#include <linux/delay.h> +#include <linux/of_device.h> +#include <linux/of_platform.h> +#include <linux/dma-mapping.h>

+#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/initval.h> +#include <sound/soc.h> +#include <sound/soc-of-simple.h>

+#include <sysdev/bestcomm/bestcomm.h> +#include <sysdev/bestcomm/gen_bd.h> +#include <asm/mpc52xx_psc.h>

+#include "mpc5200_dma.h"

+MODULE_AUTHOR("Grant Likely grant.likely@secretlab.ca"); +MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver"); +MODULE_LICENSE("GPL");

+/*

• • Interrupt handlers
• */

+static irqreturn_t psc_i2s_status_irq(int irq, void *_psc_i2s) +{

• struct psc_i2s *psc_i2s = _psc_i2s;
• struct mpc52xx_psc __iomem *regs = psc_i2s->psc_regs;
• u16 isr;
• isr = in_be16(&regs->mpc52xx_psc_isr);
• /* Playback underrun error */
• if (psc_i2s->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
• psc_i2s->stats.underrun_count++;
• /* Capture overrun error */
• if (psc_i2s->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
• psc_i2s->stats.overrun_count++;
• out_8(&regs->command, 4 << 4);  /* reset the error status */
• return IRQ_HANDLED;

+}

+/**

• • psc_i2s_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_i2s_bcom_enqueue_next_buffer(struct psc_i2s_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;

+}

+/* Bestcomm DMA irq handler */ +static irqreturn_t psc_i2s_bcom_irq(int irq, void *_psc_i2s_stream) +{

• struct psc_i2s_stream *s = _psc_i2s_stream;
• /* 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_i2s_bcom_enqueue_next_buffer(s);
• bcom_enable(s->bcom_task);
• }
• /* 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;

+}

+/**

• • psc_i2s_startup: create a new substream
• • This is the first function called when a stream is opened.
• • If this is the first stream open, then grab the IRQ and program most of
• • the PSC registers.
• */

+int psc_i2s_startup(struct snd_pcm_substream *substream,

• struct snd_soc_dai *dai)

+{

• struct snd_soc_pcm_runtime *rtd = substream->private_data;
• struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
• int rc;
• dev_dbg(psc_i2s->dev, "psc_i2s_startup(substream=%p)\n", substream);
• if (!psc_i2s->playback.active &&
• !psc_i2s->capture.active) {
• /* Setup the IRQs */
• rc = request_irq(psc_i2s->irq, &psc_i2s_status_irq, IRQF_SHARED,
• "psc-i2s-status", psc_i2s);
• rc |= request_irq(psc_i2s->capture.irq,
• &psc_i2s_bcom_irq, IRQF_SHARED,
• "psc-i2s-capture", &psc_i2s->capture);
• rc |= request_irq(psc_i2s->playback.irq,
• &psc_i2s_bcom_irq, IRQF_SHARED,
• "psc-i2s-playback", &psc_i2s->playback);
• if (rc) {
• free_irq(psc_i2s->irq, psc_i2s);
• free_irq(psc_i2s->capture.irq,
• &psc_i2s->capture);
• free_irq(psc_i2s->playback.irq,
• &psc_i2s->playback);
• return -ENODEV;
• }
• }
• return 0;

+}

+int psc_i2s_hw_free(struct snd_pcm_substream *substream,

• struct snd_soc_dai *dai)

+{

• snd_pcm_set_runtime_buffer(substream, NULL);
• return 0;

+}

+/**

• • psc_i2s_trigger: start and stop the DMA transfer.
• • This function is called by ALSA to start, stop, pause, and resume the DMA
• • transfer of data.
• */

+int psc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,

• struct snd_soc_dai *dai)

+{

• struct snd_soc_pcm_runtime *rtd = substream->private_data;
• struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
• struct snd_pcm_runtime *runtime = substream->runtime;
• struct psc_i2s_stream *s;
• struct mpc52xx_psc __iomem *regs = psc_i2s->psc_regs;
• u16 imr;
• u8 psc_cmd;
• unsigned long flags;
• if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
• s = &psc_i2s->capture;
• else
• s = &psc_i2s->playback;
• dev_dbg(psc_i2s->dev, "psc_i2s_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->active = 1;
• /* First; reset everything */
• if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
• out_8(&regs->command, MPC52xx_PSC_RST_RX);
• out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
• } else {
• out_8(&regs->command, MPC52xx_PSC_RST_TX);
• out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
• }
• /* Next, fill up the bestcomm bd queue and enable DMA.
• * This will begin filling the PSC's fifo. */
• 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);
• while (!bcom_queue_full(s->bcom_task))
• psc_i2s_bcom_enqueue_next_buffer(s);
• bcom_enable(s->bcom_task);
• /* Due to errata in the i2s mode; need to line up enabling
• * the transmitter with a transition on the frame sync
• * line */
• spin_lock_irqsave(&psc_i2s->lock, flags);
• /* first make sure it is low */
• while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) != 0)
• ;
• /* then wait for the transition to high */
• while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) == 0)
• ;
• /* Finally, enable the PSC.
• * Receiver must always be enabled; even when we only want
• * transmit.  (see 15.3.2.3 of MPC5200B User's Guide) */
• psc_cmd = MPC52xx_PSC_RX_ENABLE;
• if (substream->pstr->stream == SNDRV_PCM_STREAM_PLAYBACK)
• psc_cmd |= MPC52xx_PSC_TX_ENABLE;
• out_8(&regs->command, psc_cmd);
• spin_unlock_irqrestore(&psc_i2s->lock, flags);
• break;
• case SNDRV_PCM_TRIGGER_STOP:
• /* Turn off the PSC */
• s->active = 0;
• if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
• if (!psc_i2s->playback.active) {
• out_8(&regs->command, 2 << 4);  /* reset rx */
• out_8(&regs->command, 3 << 4);  /* reset tx */
• out_8(&regs->command, 4 << 4);  /* reset err */
• }
• } else {
• out_8(&regs->command, 3 << 4);  /* reset tx */
• out_8(&regs->command, 4 << 4);  /* reset err */
• if (!psc_i2s->capture.active)
• out_8(&regs->command, 2 << 4);  /* reset rx */
• }
• bcom_disable(s->bcom_task);
• while (!bcom_queue_empty(s->bcom_task))
• bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
• break;
• default:
• dev_dbg(psc_i2s->dev, "invalid command\n");
• return -EINVAL;
• }
• /* Update interrupt enable settings */
• imr = 0;
• if (psc_i2s->playback.active)
• imr |= MPC52xx_PSC_IMR_TXEMP;
• if (psc_i2s->capture.active)
• imr |= MPC52xx_PSC_IMR_ORERR;
• out_be16(&regs->isr_imr.imr, imr);
• return 0;

+}

+/**

• • psc_i2s_shutdown: shutdown the data transfer on a stream
• • Shutdown the PSC if there are no other substreams open.
• */

+void psc_i2s_shutdown(struct snd_pcm_substream *substream,

• struct snd_soc_dai *dai)

+{

• struct snd_soc_pcm_runtime *rtd = substream->private_data;
• struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
• dev_dbg(psc_i2s->dev, "psc_i2s_shutdown(substream=%p)\n", substream);
• /*
• * If this is the last active substream, disable the PSC and release
• * the IRQ.
• */
• if (!psc_i2s->playback.active &&
• !psc_i2s->capture.active) {
• /* Disable all interrupts and reset the PSC */
• out_be16(&psc_i2s->psc_regs->isr_imr.imr, 0);
• out_8(&psc_i2s->psc_regs->command, 3 << 4); /* reset tx */
• out_8(&psc_i2s->psc_regs->command, 2 << 4); /* reset rx */
• out_8(&psc_i2s->psc_regs->command, 1 << 4); /* reset mode */
• out_8(&psc_i2s->psc_regs->command, 4 << 4); /* reset error */
• /* Release irqs */
• free_irq(psc_i2s->irq, psc_i2s);
• free_irq(psc_i2s->capture.irq, &psc_i2s->capture);
• free_irq(psc_i2s->playback.irq, &psc_i2s->playback);
• }

+}

+/* ---------------------------------------------------------------------

• • 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_i2s_pcm_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 = 2,
• .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              = 0,

+};

+static int psc_i2s_pcm_open(struct snd_pcm_substream *substream) +{

• struct snd_soc_pcm_runtime *rtd = substream->private_data;
• struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
• struct psc_i2s_stream *s;
• dev_dbg(psc_i2s->dev, "psc_i2s_pcm_open(substream=%p)\n", substream);
• if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
• s = &psc_i2s->capture;
• else
• s = &psc_i2s->playback;
• snd_soc_set_runtime_hwparams(substream, &psc_i2s_pcm_hardware);
• s->stream = substream;
• return 0;

+}

+static int psc_i2s_pcm_close(struct snd_pcm_substream *substream) +{

• struct snd_soc_pcm_runtime *rtd = substream->private_data;
• struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
• struct psc_i2s_stream *s;
• dev_dbg(psc_i2s->dev, "psc_i2s_pcm_close(substream=%p)\n", substream);
• if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
• s = &psc_i2s->capture;
• else
• s = &psc_i2s->playback;
• s->stream = NULL;
• return 0;

+}

+static snd_pcm_uframes_t +psc_i2s_pcm_pointer(struct snd_pcm_substream *substream) +{

• struct snd_soc_pcm_runtime *rtd = substream->private_data;
• struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
• struct psc_i2s_stream *s;
• dma_addr_t count;
• if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
• s = &psc_i2s->capture;
• else
• s = &psc_i2s->playback;
• count = s->period_current_pt - s->period_start;
• return bytes_to_frames(substream->runtime, count);

+}

+static struct snd_pcm_ops psc_i2s_pcm_ops = {

• .open           = psc_i2s_pcm_open,
• .close          = psc_i2s_pcm_close,
• .ioctl          = snd_pcm_lib_ioctl,
• .pointer        = psc_i2s_pcm_pointer,

+};

+static u64 psc_i2s_pcm_dmamask = 0xffffffff; +static int psc_i2s_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,

• struct snd_pcm *pcm)

+{

• struct snd_soc_pcm_runtime *rtd = pcm->private_data;
• size_t size = psc_i2s_pcm_hardware.buffer_bytes_max;
• int rc = 0;
• dev_dbg(rtd->socdev->dev, "psc_i2s_pcm_new(card=%p, dai=%p, pcm=%p)\n",
• card, dai, pcm);
• if (!card->dev->dma_mask)
• card->dev->dma_mask = &psc_i2s_pcm_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->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->dev, size,
• &pcm->streams[1].substream->dma_buffer);
• if (rc)
• goto capture_alloc_err;
• }
• 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_i2s_pcm_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_i2s_pcm_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 psc_i2s_pcm_soc_platform = {

• .name           = "mpc5200-psc-audio",
• .pcm_ops        = &psc_i2s_pcm_ops,
• .pcm_new        = &psc_i2s_pcm_new,
• .pcm_free       = &psc_i2s_pcm_free,

+};

diff --git a/sound/soc/fsl/mpc5200_dma.h b/sound/soc/fsl/mpc5200_dma.h new file mode 100644 index 0000000..9a19e8a --- /dev/null +++ b/sound/soc/fsl/mpc5200_dma.h @@ -0,0 +1,81 @@ +/*

• • Freescale MPC5200 Audio DMA driver
• */

+#ifndef __SOUND_SOC_FSL_MPC5200_DMA_H__ +#define __SOUND_SOC_FSL_MPC5200_DMA_H__

+/**

• • psc_i2s_stream - Data specific to a single stream (playback or capture)
• • @active:            flag indicating if the stream is active
• • @psc_i2s:           pointer back to parent psc_i2s data structure
• • @bcom_task:         bestcomm task structure
• • @irq:               irq number for bestcomm task
• • @period_start:      physical address of start of DMA region
• • @period_end:                physical address of end of DMA region
• • @period_next_pt:    physical address of next DMA buffer to enqueue
• • @period_bytes:      size of DMA period in bytes
• */

+struct psc_i2s_stream {

• int active;
• struct psc_i2s *psc_i2s;
• struct bcom_task *bcom_task;
• int irq;
• struct snd_pcm_substream *stream;
• dma_addr_t period_start;
• dma_addr_t period_end;
• dma_addr_t period_next_pt;
• dma_addr_t period_current_pt;
• int period_bytes;

+};

+/**

• • psc_i2s - Private driver data
• • @name: short name for this device ("PSC0", "PSC1", etc)
• • @psc_regs: pointer to the PSC's registers
• • @fifo_regs: pointer to the PSC's FIFO registers
• • @irq: IRQ of this PSC
• • @dev: struct device pointer
• • @dai: the CPU DAI for this device
• • @sicr: Base value used in serial interface control register; mode is ORed
• • with this value.
• • @playback: Playback stream context data
• • @capture: Capture stream context data
• */

+struct psc_i2s {

• char name[32];
• struct mpc52xx_psc __iomem *psc_regs;
• struct mpc52xx_psc_fifo __iomem *fifo_regs;
• unsigned int irq;
• struct device *dev;
• struct snd_soc_dai dai;
• spinlock_t lock;
• u32 sicr;
• /* per-stream data */
• struct psc_i2s_stream playback;
• struct psc_i2s_stream capture;
• /* Statistics */
• struct {
• int overrun_count;
• int underrun_count;
• } stats;

+};

+int psc_i2s_startup(struct snd_pcm_substream *substream,

• struct snd_soc_dai *dai);

+int psc_i2s_hw_free(struct snd_pcm_substream *substream,

• struct snd_soc_dai *dai);

+void psc_i2s_shutdown(struct snd_pcm_substream *substream,

• struct snd_soc_dai *dai);

+int psc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,

• struct snd_soc_dai *dai);

+extern struct snd_soc_platform psc_i2s_pcm_soc_platform;

+#endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */ diff --git a/sound/soc/fsl/mpc5200_psc_i2s.c b/sound/soc/fsl/mpc5200_psc_i2s.c index 1111c71..8974b53 100644 --- a/sound/soc/fsl/mpc5200_psc_i2s.c +++ b/sound/soc/fsl/mpc5200_psc_i2s.c @@ -25,6 +25,8 @@  #include <sysdev/bestcomm/gen_bd.h>  #include <asm/mpc52xx_psc.h>

+#include "mpc5200_dma.h"

MODULE_AUTHOR("Grant Likely grant.likely@secretlab.ca");  MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");  MODULE_LICENSE("GPL"); @@ -47,179 +49,6 @@ MODULE_LICENSE("GPL");                         SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S24_BE | \                         SNDRV_PCM_FMTBIT_S32_BE)

-/**

• • psc_i2s_stream - Data specific to a single stream (playback or capture)
• • @active:            flag indicating if the stream is active
• • @psc_i2s:           pointer back to parent psc_i2s data structure
• • @bcom_task:         bestcomm task structure
• • @irq:               irq number for bestcomm task
• • @period_start:      physical address of start of DMA region
• • @period_end:                physical address of end of DMA region
• • @period_next_pt:    physical address of next DMA buffer to enqueue
• • @period_bytes:      size of DMA period in bytes
• */

-struct psc_i2s_stream {

• int active;
• struct psc_i2s *psc_i2s;
• struct bcom_task *bcom_task;
• int irq;
• struct snd_pcm_substream *stream;
• dma_addr_t period_start;
• dma_addr_t period_end;
• dma_addr_t period_next_pt;
• dma_addr_t period_current_pt;
• int period_bytes;

-};

-/**

• • psc_i2s - Private driver data
• • @name: short name for this device ("PSC0", "PSC1", etc)
• • @psc_regs: pointer to the PSC's registers
• • @fifo_regs: pointer to the PSC's FIFO registers
• • @irq: IRQ of this PSC
• • @dev: struct device pointer
• • @dai: the CPU DAI for this device
• • @sicr: Base value used in serial interface control register; mode is ORed
• • with this value.
• • @playback: Playback stream context data
• • @capture: Capture stream context data
• */

-struct psc_i2s {

• char name[32];
• struct mpc52xx_psc __iomem *psc_regs;
• struct mpc52xx_psc_fifo __iomem *fifo_regs;
• unsigned int irq;
• struct device *dev;
• struct snd_soc_dai dai;
• spinlock_t lock;
• u32 sicr;
• /* per-stream data */
• struct psc_i2s_stream playback;
• struct psc_i2s_stream capture;
• /* Statistics */
• struct {
• int overrun_count;
• int underrun_count;
• } stats;

-};

-/*

• • Interrupt handlers
• */

-static irqreturn_t psc_i2s_status_irq(int irq, void *_psc_i2s) -{

• struct psc_i2s *psc_i2s = _psc_i2s;
• struct mpc52xx_psc __iomem *regs = psc_i2s->psc_regs;
• u16 isr;
• isr = in_be16(&regs->mpc52xx_psc_isr);
• /* Playback underrun error */
• if (psc_i2s->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
• psc_i2s->stats.underrun_count++;
• /* Capture overrun error */
• if (psc_i2s->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
• psc_i2s->stats.overrun_count++;
• out_8(&regs->command, 4 << 4);  /* reset the error status */
• return IRQ_HANDLED;

-}

-/**

• • psc_i2s_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_i2s_bcom_enqueue_next_buffer(struct psc_i2s_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;

-}

-/* Bestcomm DMA irq handler */ -static irqreturn_t psc_i2s_bcom_irq(int irq, void *_psc_i2s_stream) -{

• struct psc_i2s_stream *s = _psc_i2s_stream;
• /* 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_i2s_bcom_enqueue_next_buffer(s);
• bcom_enable(s->bcom_task);
• }
• /* 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;

-}

-/**

• • psc_i2s_startup: create a new substream
• • This is the first function called when a stream is opened.
• • If this is the first stream open, then grab the IRQ and program most of
• • the PSC registers.
• */

-static int psc_i2s_startup(struct snd_pcm_substream *substream,

• struct snd_soc_dai *dai)

-{

• struct snd_soc_pcm_runtime *rtd = substream->private_data;
• struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
• int rc;
• dev_dbg(psc_i2s->dev, "psc_i2s_startup(substream=%p)\n", substream);
• if (!psc_i2s->playback.active &&
• !psc_i2s->capture.active) {
• /* Setup the IRQs */
• rc = request_irq(psc_i2s->irq, &psc_i2s_status_irq, IRQF_SHARED,
• "psc-i2s-status", psc_i2s);
• rc |= request_irq(psc_i2s->capture.irq,
• &psc_i2s_bcom_irq, IRQF_SHARED,
• "psc-i2s-capture", &psc_i2s->capture);
• rc |= request_irq(psc_i2s->playback.irq,
• &psc_i2s_bcom_irq, IRQF_SHARED,
• "psc-i2s-playback", &psc_i2s->playback);
• if (rc) {
• free_irq(psc_i2s->irq, psc_i2s);
• free_irq(psc_i2s->capture.irq,
• &psc_i2s->capture);
• free_irq(psc_i2s->playback.irq,
• &psc_i2s->playback);
• return -ENODEV;
• }
• }
• return 0;

-}

static int psc_i2s_hw_params(struct snd_pcm_substream *substream,                                 struct snd_pcm_hw_params *params,                                 struct snd_soc_dai *dai) @@ -258,164 +87,6 @@ static int psc_i2s_hw_params(struct snd_pcm_substream *substream,        return 0;  }

-static int psc_i2s_hw_free(struct snd_pcm_substream *substream,

• struct snd_soc_dai *dai)

-{

• snd_pcm_set_runtime_buffer(substream, NULL);
• return 0;

-}

-/**

• • psc_i2s_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_i2s_trigger(struct snd_pcm_substream *substream, int cmd,

• struct snd_soc_dai *dai)

-{

• struct snd_soc_pcm_runtime *rtd = substream->private_data;
• struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
• struct snd_pcm_runtime *runtime = substream->runtime;
• struct psc_i2s_stream *s;
• struct mpc52xx_psc __iomem *regs = psc_i2s->psc_regs;
• u16 imr;
• u8 psc_cmd;
• unsigned long flags;
• if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
• s = &psc_i2s->capture;
• else
• s = &psc_i2s->playback;
• dev_dbg(psc_i2s->dev, "psc_i2s_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->active = 1;
• /* First; reset everything */
• if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
• out_8(&regs->command, MPC52xx_PSC_RST_RX);
• out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
• } else {
• out_8(&regs->command, MPC52xx_PSC_RST_TX);
• out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
• }
• /* Next, fill up the bestcomm bd queue and enable DMA.
• * This will begin filling the PSC's fifo. */
• 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);
• while (!bcom_queue_full(s->bcom_task))
• psc_i2s_bcom_enqueue_next_buffer(s);
• bcom_enable(s->bcom_task);
• /* Due to errata in the i2s mode; need to line up enabling
• * the transmitter with a transition on the frame sync
• * line */
• spin_lock_irqsave(&psc_i2s->lock, flags);
• /* first make sure it is low */
• while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) != 0)
• ;
• /* then wait for the transition to high */
• while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) == 0)
• ;
• /* Finally, enable the PSC.
• * Receiver must always be enabled; even when we only want
• * transmit.  (see 15.3.2.3 of MPC5200B User's Guide) */
• psc_cmd = MPC52xx_PSC_RX_ENABLE;
• if (substream->pstr->stream == SNDRV_PCM_STREAM_PLAYBACK)
• psc_cmd |= MPC52xx_PSC_TX_ENABLE;
• out_8(&regs->command, psc_cmd);
• spin_unlock_irqrestore(&psc_i2s->lock, flags);
• break;
• case SNDRV_PCM_TRIGGER_STOP:
• /* Turn off the PSC */
• s->active = 0;
• if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
• if (!psc_i2s->playback.active) {
• out_8(&regs->command, 2 << 4);  /* reset rx */
• out_8(&regs->command, 3 << 4);  /* reset tx */
• out_8(&regs->command, 4 << 4);  /* reset err */
• }
• } else {
• out_8(&regs->command, 3 << 4);  /* reset tx */
• out_8(&regs->command, 4 << 4);  /* reset err */
• if (!psc_i2s->capture.active)
• out_8(&regs->command, 2 << 4);  /* reset rx */
• }
• bcom_disable(s->bcom_task);
• while (!bcom_queue_empty(s->bcom_task))
• bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
• break;
• default:
• dev_dbg(psc_i2s->dev, "invalid command\n");
• return -EINVAL;
• }
• /* Update interrupt enable settings */
• imr = 0;
• if (psc_i2s->playback.active)
• imr |= MPC52xx_PSC_IMR_TXEMP;
• if (psc_i2s->capture.active)
• imr |= MPC52xx_PSC_IMR_ORERR;
• out_be16(&regs->isr_imr.imr, imr);
• return 0;

-}

-/**

• • psc_i2s_shutdown: shutdown the data transfer on a stream
• • Shutdown the PSC if there are no other substreams open.
• */

-static void psc_i2s_shutdown(struct snd_pcm_substream *substream,

• struct snd_soc_dai *dai)

-{

• struct snd_soc_pcm_runtime *rtd = substream->private_data;
• struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
• dev_dbg(psc_i2s->dev, "psc_i2s_shutdown(substream=%p)\n", substream);
• /*
• * If this is the last active substream, disable the PSC and release
• * the IRQ.
• */
• if (!psc_i2s->playback.active &&
• !psc_i2s->capture.active) {
• /* Disable all interrupts and reset the PSC */
• out_be16(&psc_i2s->psc_regs->isr_imr.imr, 0);
• out_8(&psc_i2s->psc_regs->command, 3 << 4); /* reset tx */
• out_8(&psc_i2s->psc_regs->command, 2 << 4); /* reset rx */
• out_8(&psc_i2s->psc_regs->command, 1 << 4); /* reset mode */
• out_8(&psc_i2s->psc_regs->command, 4 << 4); /* reset error */
• /* Release irqs */
• free_irq(psc_i2s->irq, psc_i2s);
• free_irq(psc_i2s->capture.irq, &psc_i2s->capture);
• free_irq(psc_i2s->playback.irq, &psc_i2s->playback);
• }

-}

/**  * psc_i2s_set_sysclk: set the clock frequency and direction  * @@ -495,158 +166,6 @@ static struct snd_soc_dai psc_i2s_dai_template = {  };

/* ---------------------------------------------------------------------

• • The PSC I2S '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_i2s_pcm_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 = 2,
• .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              = 0,

-};

-static int psc_i2s_pcm_open(struct snd_pcm_substream *substream) -{

• struct snd_soc_pcm_runtime *rtd = substream->private_data;
• struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
• struct psc_i2s_stream *s;
• dev_dbg(psc_i2s->dev, "psc_i2s_pcm_open(substream=%p)\n", substream);
• if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
• s = &psc_i2s->capture;
• else
• s = &psc_i2s->playback;
• snd_soc_set_runtime_hwparams(substream, &psc_i2s_pcm_hardware);
• s->stream = substream;
• return 0;

-}

-static int psc_i2s_pcm_close(struct snd_pcm_substream *substream) -{

• struct snd_soc_pcm_runtime *rtd = substream->private_data;
• struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
• struct psc_i2s_stream *s;
• dev_dbg(psc_i2s->dev, "psc_i2s_pcm_close(substream=%p)\n", substream);
• if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
• s = &psc_i2s->capture;
• else
• s = &psc_i2s->playback;
• s->stream = NULL;
• return 0;

-}

-static snd_pcm_uframes_t -psc_i2s_pcm_pointer(struct snd_pcm_substream *substream) -{

• struct snd_soc_pcm_runtime *rtd = substream->private_data;
• struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
• struct psc_i2s_stream *s;
• dma_addr_t count;
• if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
• s = &psc_i2s->capture;
• else
• s = &psc_i2s->playback;
• count = s->period_current_pt - s->period_start;
• return bytes_to_frames(substream->runtime, count);

-}

-static struct snd_pcm_ops psc_i2s_pcm_ops = {

• .open           = psc_i2s_pcm_open,
• .close          = psc_i2s_pcm_close,
• .ioctl          = snd_pcm_lib_ioctl,
• .pointer        = psc_i2s_pcm_pointer,

-};

-static u64 psc_i2s_pcm_dmamask = 0xffffffff; -static int psc_i2s_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,

• struct snd_pcm *pcm)

-{

• struct snd_soc_pcm_runtime *rtd = pcm->private_data;
• size_t size = psc_i2s_pcm_hardware.buffer_bytes_max;
• int rc = 0;
• dev_dbg(rtd->socdev->dev, "psc_i2s_pcm_new(card=%p, dai=%p, pcm=%p)\n",
• card, dai, pcm);
• if (!card->dev->dma_mask)
• card->dev->dma_mask = &psc_i2s_pcm_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->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->dev, size,
• &pcm->streams[1].substream->dma_buffer);
• if (rc)
• goto capture_alloc_err;
• }
• 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_i2s_pcm_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_i2s_pcm_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 psc_i2s_pcm_soc_platform = {

• .name           = "mpc5200-psc-audio",
• .pcm_ops        = &psc_i2s_pcm_ops,
• .pcm_new        = &psc_i2s_pcm_new,
• .pcm_free       = &psc_i2s_pcm_free,

-};

-/* ---------------------------------------------------------------------  * Sysfs attributes for debugging  */