[PATCH V5 2/5] Main rewite of the mpc5200 audio DMA code
Jon Smirl
jonsmirl at gmail.com
Tue May 26 22:34:08 EST 2009
Rewrite the mpc5200 audio DMA code to support both I2S and AC97.
Signed-off-by: Jon Smirl <jonsmirl at gmail.com>
---
sound/soc/fsl/Kconfig | 1
sound/soc/fsl/mpc5200_dma.c | 442 ++++++++++++++++++++++++---------------
sound/soc/fsl/mpc5200_dma.h | 33 +--
sound/soc/fsl/mpc5200_psc_i2s.c | 247 ++++------------------
sound/soc/fsl/mpc5200_psc_i2s.h | 12 +
5 files changed, 344 insertions(+), 391 deletions(-)
create mode 100644 sound/soc/fsl/mpc5200_psc_i2s.h
diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig
index dc79bdf..1918c78 100644
--- a/sound/soc/fsl/Kconfig
+++ b/sound/soc/fsl/Kconfig
@@ -25,7 +25,6 @@ config SND_SOC_MPC8610_HPCD
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
diff --git a/sound/soc/fsl/mpc5200_dma.c b/sound/soc/fsl/mpc5200_dma.c
index 6850392..efec33a 100644
--- a/sound/soc/fsl/mpc5200_dma.c
+++ b/sound/soc/fsl/mpc5200_dma.c
@@ -3,23 +3,13 @@
* ALSA SoC Platform driver
*
* Copyright (C) 2008 Secret Lab Technologies Ltd.
+ * Copyright (C) 2009 Jon Smirl, Digispeaker
*/
-#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>
@@ -27,10 +17,6 @@
#include "mpc5200_dma.h"
-MODULE_AUTHOR("Grant Likely <grant.likely at secretlab.ca>");
-MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
-MODULE_LICENSE("GPL");
-
/*
* Interrupt handlers
*/
@@ -50,7 +36,7 @@ static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma)
if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
psc_dma->stats.overrun_count++;
- out_8(®s->command, 4 << 4); /* reset the error status */
+ out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT);
return IRQ_HANDLED;
}
@@ -81,21 +67,36 @@ static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
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(int irq, void *_psc_dma_stream)
+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_next_buffer(s);
- bcom_enable(s->bcom_task);
}
+ 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. */
@@ -105,49 +106,33 @@ static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream)
return IRQ_HANDLED;
}
-/**
- * psc_dma_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_dma_startup(struct snd_pcm_substream *substream,
- struct snd_soc_dai *dai)
+static irqreturn_t psc_dma_bcom_irq_rx(int irq, void *_psc_dma_stream)
{
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
- int rc;
+ struct psc_dma_stream *s = _psc_dma_stream;
- dev_dbg(psc_dma->dev, "psc_dma_startup(substream=%p)\n", substream);
+ 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);
- if (!psc_dma->playback.active &&
- !psc_dma->capture.active) {
- /* Setup the IRQs */
- 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) {
- 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;
- }
+ 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);
- return 0;
+ /* 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;
}
-int psc_dma_hw_free(struct snd_pcm_substream *substream,
- struct snd_soc_dai *dai)
+static int psc_dma_hw_free(struct snd_pcm_substream *substream)
{
snd_pcm_set_runtime_buffer(substream, NULL);
return 0;
@@ -159,8 +144,7 @@ int psc_dma_hw_free(struct snd_pcm_substream *substream,
* This function is called by ALSA to start, stop, pause, and resume the DMA
* transfer of data.
*/
-int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd,
- struct snd_soc_dai *dai)
+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;
@@ -168,8 +152,8 @@ int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd,
struct psc_dma_stream *s;
struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
u16 imr;
- u8 psc_cmd;
unsigned long flags;
+ int i;
if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
s = &psc_dma->capture;
@@ -189,68 +173,48 @@ int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd,
(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;
- /* First; reset everything */
+ /* 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) {
- out_8(®s->command, MPC52xx_PSC_RST_RX);
- out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT);
+ 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 {
- out_8(®s->command, MPC52xx_PSC_RST_TX);
- out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT);
+ bcom_gen_bd_tx_reset(s->bcom_task);
+ psc_dma_bcom_enqueue_tx(s);
}
- /* 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_dma_bcom_enqueue_next_buffer(s);
bcom_enable(s->bcom_task);
-
- /* Due to errata in the dma mode; need to line up enabling
- * the transmitter with a transition on the frame sync
- * line */
-
- spin_lock_irqsave(&psc_dma->lock, flags);
- /* first make sure it is low */
- while ((in_8(®s->ipcr_acr.ipcr) & 0x80) != 0)
- ;
- /* then wait for the transition to high */
- while ((in_8(®s->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(®s->command, psc_cmd);
spin_unlock_irqrestore(&psc_dma->lock, flags);
+ out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT);
+
break;
case SNDRV_PCM_TRIGGER_STOP:
- /* Turn off the PSC */
s->active = 0;
- if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
- if (!psc_dma->playback.active) {
- out_8(®s->command, 2 << 4); /* reset rx */
- out_8(®s->command, 3 << 4); /* reset tx */
- out_8(®s->command, 4 << 4); /* reset err */
- }
- } else {
- out_8(®s->command, 3 << 4); /* reset tx */
- out_8(®s->command, 4 << 4); /* reset err */
- if (!psc_dma->capture.active)
- out_8(®s->command, 2 << 4); /* reset rx */
- }
+ spin_lock_irqsave(&psc_dma->lock, flags);
bcom_disable(s->bcom_task);
- while (!bcom_queue_empty(s->bcom_task))
- bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
+ 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;
@@ -265,44 +229,11 @@ int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd,
imr |= MPC52xx_PSC_IMR_TXEMP;
if (psc_dma->capture.active)
imr |= MPC52xx_PSC_IMR_ORERR;
- out_be16(®s->isr_imr.imr, imr);
+ out_be16(®s->isr_imr.imr, psc_dma->imr | imr);
return 0;
}
-/**
- * psc_dma_shutdown: shutdown the data transfer on a stream
- *
- * Shutdown the PSC if there are no other substreams open.
- */
-void psc_dma_shutdown(struct snd_pcm_substream *substream,
- struct snd_soc_dai *dai)
-{
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
-
- dev_dbg(psc_dma->dev, "psc_dma_shutdown(substream=%p)\n", substream);
-
- /*
- * If this is the last active substream, disable the PSC and release
- * the IRQ.
- */
- 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, 0);
- out_8(&psc_dma->psc_regs->command, 3 << 4); /* reset tx */
- out_8(&psc_dma->psc_regs->command, 2 << 4); /* reset rx */
- out_8(&psc_dma->psc_regs->command, 1 << 4); /* reset mode */
- out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
-
- /* 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);
- }
-}
/* ---------------------------------------------------------------------
* The PSC DMA 'ASoC platform' driver
@@ -312,62 +243,78 @@ void psc_dma_shutdown(struct snd_pcm_substream *substream,
* interaction with the attached codec
*/
-static const struct snd_pcm_hardware psc_dma_pcm_hardware = {
+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,
+ SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
.rate_min = 8000,
.rate_max = 48000,
- .channels_min = 2,
+ .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 = 0,
+ .fifo_size = 512,
};
-static int psc_dma_pcm_open(struct snd_pcm_substream *substream)
+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_pcm_open(substream=%p)\n", substream);
+ 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_pcm_hardware);
+ 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_pcm_close(struct snd_pcm_substream *substream)
+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_pcm_close(substream=%p)\n", substream);
+ 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_pcm_pointer(struct snd_pcm_substream *substream)
+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;
@@ -384,60 +331,78 @@ psc_dma_pcm_pointer(struct snd_pcm_substream *substream)
return bytes_to_frames(substream->runtime, count);
}
-static struct snd_pcm_ops psc_dma_pcm_ops = {
- .open = psc_dma_pcm_open,
- .close = psc_dma_pcm_close,
+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_pcm_pointer,
+ .pointer = psc_dma_pointer,
+ .trigger = psc_dma_trigger,
+ .hw_params = psc_dma_hw_params,
};
-static u64 psc_dma_pcm_dmamask = 0xffffffff;
-static int psc_dma_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
+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;
- size_t size = psc_dma_pcm_hardware.buffer_bytes_max;
+ 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_pcm_new(card=%p, dai=%p, pcm=%p)\n",
+ 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_pcm_dmamask;
+ 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->dev, size,
- &pcm->streams[0].substream->dma_buffer);
+ 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->dev, size,
- &pcm->streams[1].substream->dma_buffer);
+ 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_pcm_free(struct snd_pcm *pcm)
+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_pcm_free(pcm=%p)\n", pcm);
+ dev_dbg(rtd->socdev->dev, "psc_dma_free(pcm=%p)\n", pcm);
for (stream = 0; stream < 2; stream++) {
substream = pcm->streams[stream].substream;
@@ -449,10 +414,151 @@ static void psc_dma_pcm_free(struct snd_pcm *pcm)
}
}
-struct snd_soc_platform psc_dma_pcm_soc_platform = {
+struct snd_soc_platform mpc5200_audio_dma_platform = {
.name = "mpc5200-psc-audio",
- .pcm_ops = &psc_dma_pcm_ops,
- .pcm_new = &psc_dma_pcm_new,
- .pcm_free = &psc_dma_pcm_free,
+ .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 at secretlab.ca>");
+MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/fsl/mpc5200_dma.h b/sound/soc/fsl/mpc5200_dma.h
index a33232c..2000803 100644
--- a/sound/soc/fsl/mpc5200_dma.h
+++ b/sound/soc/fsl/mpc5200_dma.h
@@ -5,8 +5,10 @@
#ifndef __SOUND_SOC_FSL_MPC5200_DMA_H__
#define __SOUND_SOC_FSL_MPC5200_DMA_H__
+#define PSC_STREAM_NAME_LEN 32
+
/**
- * psc_dma_stream - Data specific to a single stream (playback or capture)
+ * psc_ac97_stream - Data specific to a single stream (playback or capture)
* @active: flag indicating if the stream is active
* @psc_dma: pointer back to parent psc_dma data structure
* @bcom_task: bestcomm task structure
@@ -17,6 +19,9 @@
* @period_bytes: size of DMA period in bytes
*/
struct psc_dma_stream {
+ struct snd_pcm_runtime *runtime;
+ snd_pcm_uframes_t appl_ptr;
+
int active;
struct psc_dma *psc_dma;
struct bcom_task *bcom_task;
@@ -27,6 +32,7 @@ struct psc_dma_stream {
dma_addr_t period_next_pt;
dma_addr_t period_current_pt;
int period_bytes;
+ int period_size;
};
/**
@@ -48,9 +54,12 @@ struct psc_dma {
struct mpc52xx_psc_fifo __iomem *fifo_regs;
unsigned int irq;
struct device *dev;
- struct snd_soc_dai dai;
spinlock_t lock;
u32 sicr;
+ uint sysclk;
+ int imr;
+ int id;
+ unsigned int slots;
/* per-stream data */
struct psc_dma_stream playback;
@@ -58,24 +67,14 @@ struct psc_dma {
/* Statistics */
struct {
- int overrun_count;
- int underrun_count;
+ unsigned long overrun_count;
+ unsigned long underrun_count;
} stats;
};
+int mpc5200_audio_dma_create(struct of_device *op);
+int mpc5200_audio_dma_destroy(struct of_device *op);
-int psc_dma_startup(struct snd_pcm_substream *substream,
- struct snd_soc_dai *dai);
-
-int psc_dma_hw_free(struct snd_pcm_substream *substream,
- struct snd_soc_dai *dai);
-
-void psc_dma_shutdown(struct snd_pcm_substream *substream,
- struct snd_soc_dai *dai);
-
-int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd,
- struct snd_soc_dai *dai);
-
-extern struct snd_soc_platform psc_dma_pcm_soc_platform;
+extern struct snd_soc_platform mpc5200_audio_dma_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 12a7917..ce8de90 100644
--- a/sound/soc/fsl/mpc5200_psc_i2s.c
+++ b/sound/soc/fsl/mpc5200_psc_i2s.c
@@ -3,34 +3,22 @@
* ALSA SoC Digital Audio Interface (DAI) driver
*
* Copyright (C) 2008 Secret Lab Technologies Ltd.
+ * Copyright (C) 2009 Jon Smirl, Digispeaker
*/
-#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_psc_i2s.h"
#include "mpc5200_dma.h"
-MODULE_AUTHOR("Grant Likely <grant.likely at secretlab.ca>");
-MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
-MODULE_LICENSE("GPL");
-
/**
* PSC_I2S_RATES: sample rates supported by the I2S
*
@@ -46,8 +34,7 @@ MODULE_LICENSE("GPL");
* PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode
*/
#define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \
- SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S24_BE | \
- SNDRV_PCM_FMTBIT_S32_BE)
+ SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)
static int psc_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
@@ -82,8 +69,6 @@ static int psc_i2s_hw_params(struct snd_pcm_substream *substream,
}
out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode);
- snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
-
return 0;
}
@@ -140,16 +125,13 @@ static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format)
* psc_i2s_dai_template: template CPU Digital Audio Interface
*/
static struct snd_soc_dai_ops psc_i2s_dai_ops = {
- .startup = psc_dma_startup,
.hw_params = psc_i2s_hw_params,
- .hw_free = psc_dma_hw_free,
- .shutdown = psc_dma_shutdown,
- .trigger = psc_dma_trigger,
.set_sysclk = psc_i2s_set_sysclk,
.set_fmt = psc_i2s_set_fmt,
};
-static struct snd_soc_dai psc_i2s_dai_template = {
+struct snd_soc_dai psc_i2s_dai[] = {{
+ .name = "I2S",
.playback = {
.channels_min = 2,
.channels_max = 2,
@@ -163,71 +145,8 @@ static struct snd_soc_dai psc_i2s_dai_template = {
.formats = PSC_I2S_FORMATS,
},
.ops = &psc_i2s_dai_ops,
-};
-
-/* ---------------------------------------------------------------------
- * Sysfs attributes for debugging
- */
-
-static ssize_t psc_i2s_status_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct psc_dma *psc_dma = dev_get_drvdata(dev);
-
- return sprintf(buf, "status=%.4x sicr=%.8x rfnum=%i rfstat=0x%.4x "
- "tfnum=%i tfstat=0x%.4x\n",
- in_be16(&psc_dma->psc_regs->sr_csr.status),
- in_be32(&psc_dma->psc_regs->sicr),
- in_be16(&psc_dma->fifo_regs->rfnum) & 0x1ff,
- in_be16(&psc_dma->fifo_regs->rfstat),
- in_be16(&psc_dma->fifo_regs->tfnum) & 0x1ff,
- in_be16(&psc_dma->fifo_regs->tfstat));
-}
-
-static int *psc_i2s_get_stat_attr(struct psc_dma *psc_dma, const char *name)
-{
- if (strcmp(name, "playback_underrun") == 0)
- return &psc_dma->stats.underrun_count;
- if (strcmp(name, "capture_overrun") == 0)
- return &psc_dma->stats.overrun_count;
-
- return NULL;
-}
-
-static ssize_t psc_i2s_stat_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct psc_dma *psc_dma = dev_get_drvdata(dev);
- int *attrib;
-
- attrib = psc_i2s_get_stat_attr(psc_dma, attr->attr.name);
- if (!attrib)
- return 0;
-
- return sprintf(buf, "%i\n", *attrib);
-}
-
-static ssize_t psc_i2s_stat_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t count)
-{
- struct psc_dma *psc_dma = dev_get_drvdata(dev);
- int *attrib;
-
- attrib = psc_i2s_get_stat_attr(psc_dma, attr->attr.name);
- if (!attrib)
- return 0;
-
- *attrib = simple_strtoul(buf, NULL, 0);
- return count;
-}
-
-static DEVICE_ATTR(status, 0644, psc_i2s_status_show, NULL);
-static DEVICE_ATTR(playback_underrun, 0644, psc_i2s_stat_show,
- psc_i2s_stat_store);
-static DEVICE_ATTR(capture_overrun, 0644, psc_i2s_stat_show,
- psc_i2s_stat_store);
+} };
+EXPORT_SYMBOL_GPL(psc_i2s_dai);
/* ---------------------------------------------------------------------
* OF platform bus binding code:
@@ -237,82 +156,26 @@ static DEVICE_ATTR(capture_overrun, 0644, psc_i2s_stat_show,
static int __devinit psc_i2s_of_probe(struct of_device *op,
const struct of_device_id *match)
{
- phys_addr_t fifo;
+ int rc;
struct psc_dma *psc_dma;
- struct resource res;
- int size, psc_id, irq, rc;
- const __be32 *prop;
- void __iomem *regs;
-
- dev_dbg(&op->dev, "probing psc i2s device\n");
-
- /* Get the PSC ID */
- prop = of_get_property(op->node, "cell-index", &size);
- if (!prop || size < sizeof *prop)
- return -ENODEV;
- psc_id = be32_to_cpu(*prop);
-
- /* 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;
- }
+ struct mpc52xx_psc __iomem *regs;
- /* Allocate and initialize the driver private data */
- psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
- if (!psc_dma) {
- iounmap(regs);
- return -ENOMEM;
- }
- spin_lock_init(&psc_dma->lock);
- 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_id+1);
-
- /* Fill out the CPU DAI structure */
- memcpy(&psc_dma->dai, &psc_i2s_dai_template, sizeof psc_dma->dai);
- psc_dma->dai.private_data = psc_dma;
- psc_dma->dai.name = psc_dma->name;
- psc_dma->dai.id = psc_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_id, 10, fifo, 512);
- psc_dma->playback.bcom_task =
- bcom_psc_gen_bd_tx_init(psc_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;
+ rc = mpc5200_audio_dma_create(op);
+ if (rc != 0)
+ return rc;
+
+ rc = snd_soc_register_dais(psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai));
+ if (rc != 0) {
+ pr_err("Failed to register DAI\n");
+ return 0;
}
- /* Disable all interrupts and reset the PSC */
- out_be16(&psc_dma->psc_regs->isr_imr.imr, 0);
- out_8(&psc_dma->psc_regs->command, 3 << 4); /* reset transmitter */
- out_8(&psc_dma->psc_regs->command, 2 << 4); /* reset receiver */
- out_8(&psc_dma->psc_regs->command, 1 << 4); /* reset mode */
- out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
+ psc_dma = dev_get_drvdata(&op->dev);
+ regs = psc_dma->psc_regs;
/* Configure the serial interface mode; defaulting to CODEC8 mode */
psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S |
MPC52xx_PSC_SICR_CLKPOL;
- if (of_get_property(op->node, "fsl,cellslave", NULL))
- psc_dma->sicr |= MPC52xx_PSC_SICR_CELLSLAVE |
- MPC52xx_PSC_SICR_GENCLK;
out_be32(&psc_dma->psc_regs->sicr,
psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8);
@@ -321,66 +184,37 @@ static int __devinit psc_i2s_of_probe(struct of_device *op,
if (!of_get_property(op->node, "codec-handle", NULL))
return 0;
- /* 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);
-
- /* Save what we've done so it can be found again later */
- dev_set_drvdata(&op->dev, psc_dma);
-
- /* Register the SYSFS files */
- rc = device_create_file(psc_dma->dev, &dev_attr_status);
- rc |= device_create_file(psc_dma->dev, &dev_attr_capture_overrun);
- rc |= device_create_file(psc_dma->dev, &dev_attr_playback_underrun);
- if (rc)
- dev_info(psc_dma->dev, "error creating sysfs files\n");
-
- snd_soc_register_platform(&psc_dma_pcm_soc_platform);
-
- /* Tell the ASoC OF helpers about it */
- of_snd_soc_register_platform(&psc_dma_pcm_soc_platform, op->node,
- &psc_dma->dai);
+ /* Due to errata in the dma mode; need to line up enabling
+ * the transmitter with a transition on the frame sync
+ * line */
+
+ /* first make sure it is low */
+ while ((in_8(®s->ipcr_acr.ipcr) & 0x80) != 0)
+ ;
+ /* then wait for the transition to high */
+ while ((in_8(®s->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) */
+
+ /* Go */
+ out_8(&psc_dma->psc_regs->command,
+ MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
return 0;
+
}
static int __devexit psc_i2s_of_remove(struct of_device *op)
{
- struct psc_dma *psc_dma = dev_get_drvdata(&op->dev);
-
- dev_dbg(&op->dev, "psc_i2s_remove()\n");
-
- snd_soc_unregister_platform(&psc_dma_pcm_soc_platform);
-
- bcom_gen_bd_rx_release(psc_dma->capture.bcom_task);
- bcom_gen_bd_tx_release(psc_dma->playback.bcom_task);
-
- iounmap(psc_dma->psc_regs);
- iounmap(psc_dma->fifo_regs);
- kfree(psc_dma);
- dev_set_drvdata(&op->dev, NULL);
-
- return 0;
+ return mpc5200_audio_dma_destroy(op);
}
/* Match table for of_platform binding */
static struct of_device_id psc_i2s_match[] __devinitdata = {
{ .compatible = "fsl,mpc5200-psc-i2s", },
+ { .compatible = "fsl,mpc5200b-psc-i2s", },
{}
};
MODULE_DEVICE_TABLE(of, psc_i2s_match);
@@ -411,4 +245,7 @@ static void __exit psc_i2s_exit(void)
}
module_exit(psc_i2s_exit);
+MODULE_AUTHOR("Grant Likely <grant.likely at secretlab.ca>");
+MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/fsl/mpc5200_psc_i2s.h b/sound/soc/fsl/mpc5200_psc_i2s.h
new file mode 100644
index 0000000..ce55e07
--- /dev/null
+++ b/sound/soc/fsl/mpc5200_psc_i2s.h
@@ -0,0 +1,12 @@
+/*
+ * Freescale MPC5200 PSC in I2S mode
+ * ALSA SoC Digital Audio Interface (DAI) driver
+ *
+ */
+
+#ifndef __SOUND_SOC_FSL_MPC52xx_PSC_I2S_H__
+#define __SOUND_SOC_FSL_MPC52xx_PSC_I2S_H__
+
+extern struct snd_soc_dai psc_i2s_dai[];
+
+#endif /* __SOUND_SOC_FSL_MPC52xx_PSC_I2S_H__ */
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