/*
* Configures McPDM downlink for audio playback.
* This function should be called before omap_mcpdm_start.
*/
int omap_mcpdm_playback_open(struct omap_mcpdm_link *downlink)
{
int irq_mask = 0;
int ctrl;
if (!downlink)
return -EINVAL;
mcpdm->downlink = downlink;
/* Enable irq request generation */
irq_mask |= downlink->irq_mask & MCPDM_DOWNLINK_IRQ_MASK;
omap_mcpdm_write(MCPDM_IRQENABLE_SET, irq_mask);
/* Configure uplink threshold */
if (downlink->threshold > DN_THRES_MAX)
downlink->threshold = DN_THRES_MAX;
omap_mcpdm_write(MCPDM_FIFO_CTRL_DN, downlink->threshold);
/* Enable DMA request generation */
omap_mcpdm_write(MCPDM_DMAENABLE_SET, DMA_DN_ENABLE);
/* Set pdm out format */
ctrl = omap_mcpdm_read(MCPDM_CTRL);
ctrl &= ~PDMOUTFORMAT;
ctrl |= downlink->format & PDMOUTFORMAT;
/* Downlink channels */
mcpdm->dn_channels = downlink->channels & (PDM_DN_MASK | PDM_CMD_MASK);
omap_mcpdm_write(MCPDM_CTRL, ctrl);
return 0;
}
/*
* Configures McPDM uplink for audio recording.
* This function should be called before omap_mcpdm_start.
*/
int omap_mcpdm_capture_open(struct omap_mcpdm_link *uplink)
{
int irq_mask = 0;
int ctrl;
if (!uplink)
return -EINVAL;
mcpdm->uplink = uplink;
/* Enable irq request generation */
irq_mask |= uplink->irq_mask & MCPDM_UPLINK_IRQ_MASK;
omap_mcpdm_write(MCPDM_IRQENABLE_SET, irq_mask);
/* Configure uplink threshold */
if (uplink->threshold > UP_THRES_MAX)
uplink->threshold = UP_THRES_MAX;
omap_mcpdm_write(MCPDM_FIFO_CTRL_UP, uplink->threshold);
/* Configure DMA controller */
omap_mcpdm_write(MCPDM_DMAENABLE_SET, DMA_UP_ENABLE);
/* Set pdm out format */
ctrl = omap_mcpdm_read(MCPDM_CTRL);
ctrl &= ~PDMOUTFORMAT;
ctrl |= uplink->format & PDMOUTFORMAT;
/* Uplink channels */
mcpdm->up_channels = uplink->channels & (PDM_UP_MASK | PDM_STATUS_MASK);
omap_mcpdm_write(MCPDM_CTRL, ctrl);
return 0;
}
/*
* Enables the transfer through the PDM interface to/from the Phoenix
* codec by enabling the corresponding UP or DN channels.
*/
static void omap_mcpdm_start(struct omap_mcpdm *mcpdm)
{
u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
u32 link_mask = mcpdm->config[0].link_mask | mcpdm->config[1].link_mask;
ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
ctrl |= link_mask;
omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
}
/*
* Disables the transfer through the PDM interface to/from the Phoenix
* codec by disabling the corresponding UP or DN channels.
*/
static void omap_mcpdm_stop(struct omap_mcpdm *mcpdm)
{
u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
u32 link_mask = MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK;
ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
ctrl &= ~(link_mask);
omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
}
static irqreturn_t omap_mcpdm_irq_handler(int irq, void *dev_id)
{
struct omap_mcpdm *mcpdm_irq = dev_id;
int irq_status;
irq_status = omap_mcpdm_read(MCPDM_IRQSTATUS);
/* Acknowledge irq event */
omap_mcpdm_write(MCPDM_IRQSTATUS, irq_status);
switch (irq_status) {
case DN_IRQ_FULL:
case DN_IRQ_EMTPY:
dev_err(mcpdm_irq->dev, "DN FIFO error %x\n", irq_status);
omap_mcpdm_reset(MCPDM_DOWNLINK, 1);
omap_mcpdm_set_downlink(mcpdm_irq->downlink);
omap_mcpdm_reset(MCPDM_DOWNLINK, 0);
break;
case DN_IRQ:
dev_dbg(mcpdm_irq->dev, "DN write request\n");
break;
case UP_IRQ_FULL:
case UP_IRQ_EMPTY:
dev_err(mcpdm_irq->dev, "UP FIFO error %x\n", irq_status);
omap_mcpdm_reset(MCPDM_UPLINK, 1);
omap_mcpdm_set_uplink(mcpdm_irq->uplink);
omap_mcpdm_reset(MCPDM_UPLINK, 0);
break;
case UP_IRQ:
dev_dbg(mcpdm_irq->dev, "UP write request\n");
break;
}
return IRQ_HANDLED;
}
static int omap_mcpdm_probe(struct snd_soc_dai *dai)
{
struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
int ret;
pm_runtime_enable(mcpdm->dev);
/* Disable lines while request is ongoing */
pm_runtime_get_sync(mcpdm->dev);
omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, 0x00);
ret = request_irq(mcpdm->irq, omap_mcpdm_irq_handler, 0, "McPDM",
(void *)mcpdm);
pm_runtime_put_sync(mcpdm->dev);
if (ret) {
dev_err(mcpdm->dev, "Request for IRQ failed\n");
pm_runtime_disable(mcpdm->dev);
}
/* Configure McPDM threshold values */
mcpdm->config[SNDRV_PCM_STREAM_PLAYBACK].threshold = 2;
mcpdm->config[SNDRV_PCM_STREAM_CAPTURE].threshold =
MCPDM_UP_THRES_MAX - 3;
snd_soc_dai_init_dma_data(dai,
&mcpdm->dma_data[SNDRV_PCM_STREAM_PLAYBACK],
&mcpdm->dma_data[SNDRV_PCM_STREAM_CAPTURE]);
return ret;
}
static irqreturn_t omap_mcpdm_irq_handler(int irq, void *dev_id)
{
struct omap_mcpdm *mcpdm = dev_id;
int irq_status;
irq_status = omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS);
/* Acknowledge irq event */
omap_mcpdm_write(mcpdm, MCPDM_REG_IRQSTATUS, irq_status);
if (irq_status & MCPDM_DN_IRQ_FULL)
dev_dbg(mcpdm->dev, "DN (playback) FIFO Full\n");
if (irq_status & MCPDM_DN_IRQ_EMPTY)
dev_dbg(mcpdm->dev, "DN (playback) FIFO Empty\n");
if (irq_status & MCPDM_DN_IRQ)
dev_dbg(mcpdm->dev, "DN (playback) write request\n");
if (irq_status & MCPDM_UP_IRQ_FULL)
dev_dbg(mcpdm->dev, "UP (capture) FIFO Full\n");
if (irq_status & MCPDM_UP_IRQ_EMPTY)
dev_dbg(mcpdm->dev, "UP (capture) FIFO Empty\n");
if (irq_status & MCPDM_UP_IRQ)
dev_dbg(mcpdm->dev, "UP (capture) write request\n");
return IRQ_HANDLED;
}
/* Enable/disable DC offset cancelation for the analog
* headset path (PDM channels 1 and 2).
*/
int omap_mcpdm_set_offset(int offset1, int offset2)
{
int offset;
if ((offset1 > DN_OFST_MAX) || (offset2 > DN_OFST_MAX))
return -EINVAL;
offset = (offset1 << DN_OFST_RX1) | (offset2 << DN_OFST_RX2);
/* offset cancellation for channel 1 */
if (offset1)
offset |= DN_OFST_RX1_EN;
else
offset &= ~DN_OFST_RX1_EN;
/* offset cancellation for channel 2 */
if (offset2)
offset |= DN_OFST_RX2_EN;
else
offset &= ~DN_OFST_RX2_EN;
omap_mcpdm_write(MCPDM_DN_OFFSET, offset);
return 0;
}
int omap_mcpdm_request(void)
{
int ret;
clk_enable(mcpdm->clk);
spin_lock(&mcpdm->lock);
if (!mcpdm->free) {
dev_err(mcpdm->dev, "McPDM interface is in use\n");
spin_unlock(&mcpdm->lock);
ret = -EBUSY;
goto err;
}
mcpdm->free = 0;
spin_unlock(&mcpdm->lock);
/* Disable lines while request is ongoing */
omap_mcpdm_write(MCPDM_CTRL, 0x00);
ret = request_irq(mcpdm->irq, omap_mcpdm_irq_handler,
0, "McPDM", (void *)mcpdm);
if (ret) {
dev_err(mcpdm->dev, "Request for McPDM IRQ failed\n");
goto err;
}
return 0;
err:
clk_disable(mcpdm->clk);
return ret;
}
/*
* Configures McPDM uplink, and downlink for audio.
* This function should be called before omap_mcpdm_start.
*/
static void omap_mcpdm_open_streams(struct omap_mcpdm *mcpdm)
{
u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl | MCPDM_WD_EN);
omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_SET,
MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL |
MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
/* Enable DN RX1/2 offset cancellation feature, if configured */
if (mcpdm->dn_rx_offset) {
u32 dn_offset = mcpdm->dn_rx_offset;
omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
dn_offset |= (MCPDM_DN_OFST_RX1_EN | MCPDM_DN_OFST_RX2_EN);
omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
}
omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_DN,
mcpdm->config[SNDRV_PCM_STREAM_PLAYBACK].threshold);
omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_UP,
mcpdm->config[SNDRV_PCM_STREAM_CAPTURE].threshold);
omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_SET,
MCPDM_DMA_DN_ENABLE | MCPDM_DMA_UP_ENABLE);
}
/*
* Cleans McPDM uplink, and downlink configuration.
* This function should be called when the stream is closed.
*/
static void omap_mcpdm_close_streams(struct omap_mcpdm *mcpdm)
{
/* Disable irq request generation for downlink */
omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR,
MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL);
/* Disable DMA request generation for downlink */
omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_DN_ENABLE);
/* Disable irq request generation for uplink */
omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR,
MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
/* Disable DMA request generation for uplink */
omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_UP_ENABLE);
/* Disable RX1/2 offset cancellation */
if (mcpdm->dn_rx_offset)
omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, 0);
}
/*
* Disables the transfer through the PDM interface to/from the Phoenix
* codec by disabling the corresponding UP or DN channels.
*/
void omap_mcpdm_stop(int stream)
{
int ctrl = omap_mcpdm_read(MCPDM_CTRL);
if (stream)
ctrl &= ~mcpdm->up_channels;
else
ctrl &= ~mcpdm->dn_channels;
omap_mcpdm_write(MCPDM_CTRL, ctrl);
}
static void omap_mcpdm_reset_playback(int reset)
{
int ctrl = omap_mcpdm_read(MCPDM_CTRL);
if (reset)
ctrl |= SW_DN_RST;
else
ctrl &= ~SW_DN_RST;
omap_mcpdm_write(MCPDM_CTRL, ctrl);
}
/*
* Takes the McPDM module in and out of reset state.
* Uplink and downlink can be reset individually.
*/
static void omap_mcpdm_reset_capture(int reset)
{
int ctrl = omap_mcpdm_read(MCPDM_CTRL);
if (reset)
ctrl |= SW_UP_RST;
else
ctrl &= ~SW_UP_RST;
omap_mcpdm_write(MCPDM_CTRL, ctrl);
}
/*
* Cleans McPDM uplink configuration.
* This function should be called when the stream is closed.
*/
int omap_mcpdm_capture_close(struct omap_mcpdm_link *uplink)
{
int irq_mask = 0;
if (!uplink)
return -EINVAL;
/* Disable irq request generation */
irq_mask |= uplink->irq_mask & MCPDM_UPLINK_IRQ_MASK;
omap_mcpdm_write(MCPDM_IRQENABLE_CLR, irq_mask);
/* Disable DMA request generation */
omap_mcpdm_write(MCPDM_DMAENABLE_CLR, DMA_UP_ENABLE);
/* Clear Downlink channels */
mcpdm->up_channels = 0;
mcpdm->uplink = NULL;
return 0;
}
/*
* Cleans McPDM downlink configuration.
* This function should be called when the stream is closed.
*/
int omap_mcpdm_playback_close(struct omap_mcpdm_link *downlink)
{
int irq_mask = 0;
if (!downlink)
return -EINVAL;
/* Disable irq request generation */
irq_mask |= downlink->irq_mask & MCPDM_DOWNLINK_IRQ_MASK;
omap_mcpdm_write(MCPDM_IRQENABLE_CLR, irq_mask);
/* Disable DMA request generation */
omap_mcpdm_write(MCPDM_DMAENABLE_CLR, DMA_DN_ENABLE);
/* clear Downlink channels */
mcpdm->dn_channels = 0;
mcpdm->downlink = NULL;
return 0;
}
static irqreturn_t omap_mcpdm_irq_handler(int irq, void *dev_id)
{
struct omap_mcpdm *mcpdm_irq = dev_id;
int irq_status;
irq_status = omap_mcpdm_read(MCPDM_IRQSTATUS);
/* Acknowledge irq event */
omap_mcpdm_write(MCPDM_IRQSTATUS, irq_status);
if (irq & MCPDM_DN_IRQ_FULL) {
dev_err(mcpdm_irq->dev, "DN FIFO error %x\n", irq_status);
omap_mcpdm_reset_playback(1);
omap_mcpdm_playback_open(mcpdm_irq->downlink);
omap_mcpdm_reset_playback(0);
}
if (irq & MCPDM_DN_IRQ_EMPTY) {
dev_err(mcpdm_irq->dev, "DN FIFO error %x\n", irq_status);
omap_mcpdm_reset_playback(1);
omap_mcpdm_playback_open(mcpdm_irq->downlink);
omap_mcpdm_reset_playback(0);
}
if (irq & MCPDM_DN_IRQ) {
dev_dbg(mcpdm_irq->dev, "DN write request\n");
}
if (irq & MCPDM_UP_IRQ_FULL) {
dev_err(mcpdm_irq->dev, "UP FIFO error %x\n", irq_status);
omap_mcpdm_reset_capture(1);
omap_mcpdm_capture_open(mcpdm_irq->uplink);
omap_mcpdm_reset_capture(0);
}
if (irq & MCPDM_UP_IRQ_EMPTY) {
dev_err(mcpdm_irq->dev, "UP FIFO error %x\n", irq_status);
omap_mcpdm_reset_capture(1);
omap_mcpdm_capture_open(mcpdm_irq->uplink);
omap_mcpdm_reset_capture(0);
}
if (irq & MCPDM_UP_IRQ) {
dev_dbg(mcpdm_irq->dev, "UP write request\n");
}
return IRQ_HANDLED;
}
static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
mutex_lock(&mcpdm->mutex);
if (!dai->active) {
u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl | MCPDM_WD_EN);
omap_mcpdm_open_streams(mcpdm);
}
mutex_unlock(&mcpdm->mutex);
snd_soc_dai_set_dma_data(dai, substream,
&mcpdm->dma_data[substream->stream]);
return 0;
}
void omap_mcpdm_reset(int links, int reset)
{
int ctrl = omap_mcpdm_read(MCPDM_CTRL);
if (links & MCPDM_UPLINK) {
if (reset)
ctrl |= SW_UP_RST;
else
ctrl &= ~SW_UP_RST;
}
if (links & MCPDM_DOWNLINK) {
if (reset)
ctrl |= SW_DN_RST;
else
ctrl &= ~SW_DN_RST;
}
omap_mcpdm_write(MCPDM_CTRL, ctrl);
}
