+/*
+ * 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);
+
+ ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
+ omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
+
+ ctrl |= mcpdm->dn_channels | mcpdm->up_channels;
+ 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);
+
+ ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
+ omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
+
+ ctrl &= ~(mcpdm->dn_channels | mcpdm->up_channels);
+ 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);
+
+}
+
+/*
+ * Is the physical McPDM interface active.
+ */
+static inline int omap_mcpdm_active(struct omap_mcpdm *mcpdm)
+{
+ return omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL) &
+ (MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK);
+}
+
+/*
+ * 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)
+{
+ 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->dn_threshold);
+ omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_UP, mcpdm->up_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);
+}
+
+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;
+}
+
+static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)