McPDM is the interface between Phoenix audio codec
and the OMAP4430 processor. It enables data to be transfered
to/from Phoenix at sample rates of 88.4 or 96 KHz.
Signed-off-by: Jorge Eduardo Candelaria <jorge.candelaria(a)ti.com>
Signed-off-by: Margarita Olaya <x0080101(a)ti.com>
---
sound/soc/omap/mcpdm.c | 486 ++++++++++++++++++++++++++++++++++++++++++++++++
sound/soc/omap/mcpdm.h | 151 +++++++++++++++
2 files changed, 637 insertions(+), 0 deletions(-)
create mode 100644 sound/soc/omap/mcpdm.c
create mode 100644 sound/soc/omap/mcpdm.h
diff --git a/sound/soc/omap/mcpdm.c b/sound/soc/omap/mcpdm.c
new file mode 100644
index 0000000..33f3ed6
--- /dev/null
+++ b/sound/soc/omap/mcpdm.c
@@ -0,0 +1,486 @@
+/*
+ * mcpdm.c -- McPDM interface driver
+ *
+ * Author: Jorge Eduardo Candelaria <x0107209(a)ti.com>
+ * Copyright (C) 2009 - Texas Instruments, Inc.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/wait.h>
+#include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+
+#include "mcpdm.h"
+
+static struct omap_mcpdm *mcpdm;
+
+static inline void omap_mcpdm_write(u16 reg, u32 val)
+{
+ __raw_writel(val, mcpdm->io_base + reg);
+}
+
+static inline int omap_mcpdm_read(u16 reg)
+{
+ return __raw_readl(mcpdm->io_base + reg);
+}
+
+static void omap_mcpdm_reg_dump(void)
+{
+ dev_dbg(mcpdm->dev, "***********************\n");
+ dev_dbg(mcpdm->dev, "IRQSTATUS_RAW: 0x%04x\n",
+ omap_mcpdm_read(MCPDM_IRQSTATUS_RAW));
+ dev_dbg(mcpdm->dev, "IRQSTATUS: 0x%04x\n",
+ omap_mcpdm_read(MCPDM_IRQSTATUS));
+ dev_dbg(mcpdm->dev, "IRQENABLE_SET: 0x%04x\n",
+ omap_mcpdm_read(MCPDM_IRQENABLE_SET));
+ dev_dbg(mcpdm->dev, "IRQENABLE_CLR: 0x%04x\n",
+ omap_mcpdm_read(MCPDM_IRQENABLE_CLR));
+ dev_dbg(mcpdm->dev, "IRQWAKE_EN: 0x%04x\n",
+ omap_mcpdm_read(MCPDM_IRQWAKE_EN));
+ dev_dbg(mcpdm->dev, "DMAENABLE_SET: 0x%04x\n",
+ omap_mcpdm_read(MCPDM_DMAENABLE_SET));
+ dev_dbg(mcpdm->dev, "DMAENABLE_CLR: 0x%04x\n",
+ omap_mcpdm_read(MCPDM_DMAENABLE_CLR));
+ dev_dbg(mcpdm->dev, "DMAWAKEEN: 0x%04x\n",
+ omap_mcpdm_read(MCPDM_DMAWAKEEN));
+ dev_dbg(mcpdm->dev, "CTRL: 0x%04x\n",
+ omap_mcpdm_read(MCPDM_CTRL));
+ dev_dbg(mcpdm->dev, "DN_DATA: 0x%04x\n",
+ omap_mcpdm_read(MCPDM_DN_DATA));
+ dev_dbg(mcpdm->dev, "UP_DATA: 0x%04x\n",
+ omap_mcpdm_read(MCPDM_UP_DATA));
+ dev_dbg(mcpdm->dev, "FIFO_CTRL_DN: 0x%04x\n",
+ omap_mcpdm_read(MCPDM_FIFO_CTRL_DN));
+ dev_dbg(mcpdm->dev, "FIFO_CTRL_UP: 0x%04x\n",
+ omap_mcpdm_read(MCPDM_FIFO_CTRL_UP));
+ dev_dbg(mcpdm->dev, "DN_OFFSET: 0x%04x\n",
+ omap_mcpdm_read(MCPDM_DN_OFFSET));
+ dev_dbg(mcpdm->dev, "***********************\n");
+}
+
+/*
+ * 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);
+}
+
+static void omap_mcpdm_reset_playback(int reset)
+{
+ int ctrl = omap_mcpdm_read(MCPDM_CTRL);
+
+ if (links & MCPDM_DOWNLINK) {
+ if (reset)
+ ctrl |= SW_DN_RST;
+ else
+ ctrl &= ~SW_DN_RST;
+ }
+
+ omap_mcpdm_write(MCPDM_CTRL, ctrl);
+}
+
+/*
+ * Enables the transfer through the PDM interface to/from the Phoenix
+ * codec by enabling the corresponding UP or DN channels.
+ */
+void omap_mcpdm_start(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);
+}
+
+/*
+ * 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);
+}
+
+/*
+ * 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;
+}
+
+/*
+ * 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;
+}
+
+/*
+ * 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;
+}
+
+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;
+}
+
+void omap_mcpdm_free(void)
+{
+ spin_lock(&mcpdm->lock);
+ if (mcpdm->free) {
+ dev_err(mcpdm->dev, "McPDM interface is already free\n");
+ spin_unlock(&mcpdm->lock);
+ return;
+ }
+ mcpdm->free = 1;
+ spin_unlock(&mcpdm->lock);
+
+ clk_disable(mcpdm->clk);
+
+ free_irq(mcpdm->irq, (void *)mcpdm);
+}
+
+/* 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;
+}
+
+static int __devinit omap_mcpdm_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ int ret = 0;
+
+ mcpdm = kzalloc(sizeof(struct omap_mcpdm), GFP_KERNEL);
+ if (!mcpdm) {
+ ret = -ENOMEM;
+ goto exit;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "no resource\n");
+ goto err_resource;
+ }
+
+ spin_lock_init(&mcpdm->lock);
+ mcpdm->free = 1;
+ mcpdm->io_base = ioremap(res->start, resource_size(res));
+ if (!mcpdm->io_base) {
+ ret = -ENOMEM;
+ goto err_resource;
+ }
+
+ mcpdm->irq = platform_get_irq(pdev, 0);
+
+ mcpdm->clk = clk_get(&pdev->dev, "pdm_ck");
+ if (IS_ERR(mcpdm->clk)) {
+ ret = PTR_ERR(mcpdm->clk);
+ dev_err(&pdev->dev, "unable to get pdm_ck: %d\n", ret);
+ goto err_clk;
+ }
+
+ mcpdm->dev = &pdev->dev;
+ platform_set_drvdata(pdev, mcpdm);
+
+ return 0;
+
+err_clk:
+ iounmap(mcpdm->io_base);
+err_resource:
+ kfree(mcpdm);
+exit:
+ return ret;
+}
+
+static int __devexit omap_mcpdm_remove(struct platform_device *pdev)
+{
+ struct omap_mcpdm *mcpdm_ptr = platform_get_drvdata(pdev);
+
+ platform_set_drvdata(pdev, NULL);
+
+ clk_put(mcpdm_ptr->clk);
+
+ iounmap(mcpdm_ptr->io_base);
+
+ mcpdm_ptr->clk = NULL;
+ mcpdm_ptr->free = 0;
+ mcpdm_ptr->dev = NULL;
+
+ kfree(mcpdm_ptr);
+
+ return 0;
+}
+
+static struct platform_driver omap_mcpdm_driver = {
+ .probe = omap_mcpdm_probe,
+ .remove = __devexit_p(omap_mcpdm_remove),
+ .driver = {
+ .name = "omap-mcpdm",
+ },
+};
+
+static struct platform_device *omap_mcpdm_device;
+
+static int __init omap_mcpdm_init(void)
+{
+ return platform_driver_register(&omap_mcpdm_driver);
+}
+arch_initcall(omap_mcpdm_init);
diff --git a/sound/soc/omap/mcpdm.h b/sound/soc/omap/mcpdm.h
new file mode 100644
index 0000000..41e50cc
--- /dev/null
+++ b/sound/soc/omap/mcpdm.h
@@ -0,0 +1,151 @@
+/*
+ * mcpdm.h -- Defines for McPDM driver
+ *
+ * Author: Jorge Eduardo Candelaria <x0107209(a)ti.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+/* McPDM registers */
+
+#define MCPDM_REVISION 0x00
+#define MCPDM_SYSCONFIG 0x10
+#define MCPDM_IRQSTATUS_RAW 0x24
+#define MCPDM_IRQSTATUS 0x28
+#define MCPDM_IRQENABLE_SET 0x2C
+#define MCPDM_IRQENABLE_CLR 0x30
+#define MCPDM_IRQWAKE_EN 0x34
+#define MCPDM_DMAENABLE_SET 0x38
+#define MCPDM_DMAENABLE_CLR 0x3C
+#define MCPDM_DMAWAKEEN 0x40
+#define MCPDM_CTRL 0x44
+#define MCPDM_DN_DATA 0x48
+#define MCPDM_UP_DATA 0x4C
+#define MCPDM_FIFO_CTRL_DN 0x50
+#define MCPDM_FIFO_CTRL_UP 0x54
+#define MCPDM_DN_OFFSET 0x58
+
+/*
+ * MCPDM_IRQ bit fields
+ * IRQSTATUS_RAW, IRQSTATUS, IRQENABLE_SET, IRQENABLE_CLR
+ */
+
+#define MCPDM_DN_IRQ (1 << 0)
+#define MCPDM_DN_IRQ_EMPTY (1 << 1)
+#define MCPDM_DN_IRQ_ALMST_EMPTY (1 << 2)
+#define MCPDM_DN_IRQ_FULL (1 << 3)
+
+#define MCPDM_UP_IRQ (1 << 8)
+#define MCPDM_UP_IRQ_EMPTY (1 << 9)
+#define MCPDM_UP_IRQ_ALMST_FULL (1 << 10)
+#define MCPDM_UP_IRQ_FULL (1 << 11)
+
+#define MCPDM_DOWNLINK_IRQ_MASK 0x00F
+#define MCPDM_UPLINK_IRQ_MASK 0xF00
+
+/*
+ * MCPDM_DMAENABLE bit fields
+ */
+
+#define DMA_DN_ENABLE 0x1
+#define DMA_UP_ENABLE 0x2
+
+/*
+ * MCPDM_CTRL bit fields
+ */
+
+#define PDM_UP1_EN 0x0001
+#define PDM_UP2_EN 0x0002
+#define PDM_UP3_EN 0x0004
+#define PDM_DN1_EN 0x0008
+#define PDM_DN2_EN 0x0010
+#define PDM_DN3_EN 0x0020
+#define PDM_DN4_EN 0x0040
+#define PDM_DN5_EN 0x0080
+#define PDMOUTFORMAT 0x0100
+#define CMD_INT 0x0200
+#define STATUS_INT 0x0400
+#define SW_UP_RST 0x0800
+#define SW_DN_RST 0x1000
+#define PDM_UP_MASK 0x007
+#define PDM_DN_MASK 0x0F8
+#define PDM_CMD_MASK 0x200
+#define PDM_STATUS_MASK 0x400
+
+
+#define PDMOUTFORMAT_LJUST (0 << 8)
+#define PDMOUTFORMAT_RJUST (1 << 8)
+
+/*
+ * MCPDM_FIFO_CTRL bit fields
+ */
+
+#define UP_THRES_MAX 0xF
+#define DN_THRES_MAX 0xF
+
+/*
+ * MCPDM_DN_OFFSET bit fields
+ */
+
+#define DN_OFST_RX1_EN 0x0001
+#define DN_OFST_RX2_EN 0x0100
+
+#define DN_OFST_RX1 1
+#define DN_OFST_RX2 9
+#define DN_OFST_MAX 0x1F
+
+#define MCPDM_UPLINK 1
+#define MCPDM_DOWNLINK 2
+
+struct omap_mcpdm_link {
+ int irq_mask;
+ int threshold;
+ int format;
+ int channels;
+};
+
+struct omap_mcpdm_platform_data {
+ unsigned long phys_base;
+ u16 irq;
+};
+
+struct omap_mcpdm {
+ struct device *dev;
+ unsigned long phys_base;
+ void __iomem *io_base;
+ u8 free;
+ int irq;
+
+ spinlock_t lock;
+ struct omap_mcpdm_platform_data *pdata;
+ struct clk *clk;
+ struct omap_mcpdm_link *downlink;
+ struct omap_mcpdm_link *uplink;
+ struct completion irq_completion;
+
+ int dn_channels;
+ int up_channels;
+};
+
+extern void omap_mcpdm_start(int stream);
+extern void omap_mcpdm_stop(int stream);
+extern int omap_mcpdm_capture_open(struct omap_mcpdm_link *uplink);
+extern int omap_mcpdm_playback_open(struct omap_mcpdm_link *downlink);
+extern int omap_mcpdm_capture_close(struct omap_mcpdm_link *uplink);
+extern int omap_mcpdm_playback_close(struct omap_mcpdm_link *downlink);
+extern int omap_mcpdm_request(void);
+extern void omap_mcpdm_free(void);
+extern int omap_mcpdm_set_offset(int offset1, int offset2);
--
1.6.0.4
