Patchwork [2/4,v2] TDM Framework

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Submitter Sandeep Singh
Date March 5, 2013, 12:41 p.m.
Message ID <1362487297-19702-2-git-send-email-Sandeep@freescale.com>
Download mbox | patch
Permalink /patch/224996/
State Not Applicable
Delegated to: Kumar Gala
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Comments

Sandeep Singh - March 5, 2013, 12:41 p.m.
TDM Framework is an attempt to provide a platform
 independent layer which can offer a standard interface
 for TDM access to different client modules. Beneath,
 the framework layer can house different types of TDM
 drivers to handle various TDM devices, the hardware
 intricacies of the devices being completely taken care
 by TDM drivers.

This framework layer will allow any type of TDM device to hook with it.
For example Freescale controller as on MPC8315, UCC based TDM controller, etc

The main functions of this Framework are:
 - provides interface to TDM clients to access TDM functionalities.
 - provides standard interface for TDM drivers to hook with the framework.
 - provides standard interface for line control devices to hook with the framework.
 - handles various data handling stuff and buffer management.

Presently the framework supports only Single Port channelised mode.
Also the configurability options are limited which will be extended later on.
Only kernel mode TDM clients are supported currently. Support for User mode clients will be added later.

Signed-off-by: Sandeep Singh <Sandeep@freescale.com>
Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
---
 drivers/Kconfig                 |    1 +
 drivers/Makefile                |    1 +
 drivers/tdm/Kconfig             |   25 +
 drivers/tdm/Makefile            |    8 +
 drivers/tdm/tdm-core.c          | 1198 +++++++++++++++++++++++++++++++++++++++
 include/linux/mod_devicetable.h |   11 +
 include/linux/tdm.h             |  379 +++++++++++++
 7 files changed, 1623 insertions(+), 0 deletions(-)
 create mode 100644 drivers/tdm/Kconfig
 create mode 100644 drivers/tdm/Makefile
 create mode 100644 drivers/tdm/tdm-core.c
 create mode 100644 include/linux/tdm.h

Patch

diff --git a/drivers/Kconfig b/drivers/Kconfig
index f5fb072..56a7707 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -158,4 +158,5 @@  source "drivers/irqchip/Kconfig"
 
 source "drivers/ipack/Kconfig"
 
+source "drivers/tdm/Kconfig"
 endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index 7863b9f..2f8f130 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -112,6 +112,7 @@  obj-$(CONFIG_INFINIBAND)	+= infiniband/
 obj-$(CONFIG_SGI_SN)		+= sn/
 obj-y				+= firmware/
 obj-$(CONFIG_CRYPTO)		+= crypto/
+obj-$(CONFIG_TDM)		+= tdm/
 obj-$(CONFIG_SUPERH)		+= sh/
 obj-$(CONFIG_ARCH_SHMOBILE)	+= sh/
 ifndef CONFIG_ARCH_USES_GETTIMEOFFSET
diff --git a/drivers/tdm/Kconfig b/drivers/tdm/Kconfig
new file mode 100644
index 0000000..8db2b05
--- /dev/null
+++ b/drivers/tdm/Kconfig
@@ -0,0 +1,25 @@ 
+#
+# TDM subsystem configuration
+#
+
+menuconfig TDM
+	tristate "TDM support"
+	---help---
+	  More information is contained in the directory <file:Documentation/tdm/>,
+	  especially in the file called "summary" there.
+	  If you want TDM support, you should say Y here and also to the
+	  specific driver for your bus adapter(s) below.
+
+	  This TDM support can also be built as a module.  If so, the module
+	  will be called tdm-core.
+
+if TDM
+
+config TDM_DEBUG_CORE
+	bool "TDM Core debugging messages"
+	help
+	  Say Y here if you want the TDM core to produce a bunch of debug
+	  messages to the system log.  Select this if you are having a
+	  problem with TDM support and want to see more of what is going on.
+
+endif # TDM
diff --git a/drivers/tdm/Makefile b/drivers/tdm/Makefile
new file mode 100644
index 0000000..5569616
--- /dev/null
+++ b/drivers/tdm/Makefile
@@ -0,0 +1,8 @@ 
+#
+# Makefile for the TDM core.
+#
+
+obj-$(CONFIG_TDM)		+= tdm-core.o
+ifeq ($(CONFIG_TDM_DEBUG_CORE),y)
+EXTRA_CFLAGS += -DDEBUG
+endif
diff --git a/drivers/tdm/tdm-core.c b/drivers/tdm/tdm-core.c
new file mode 100644
index 0000000..fb3d6b9
--- /dev/null
+++ b/drivers/tdm/tdm-core.c
@@ -0,0 +1,1198 @@ 
+/* driver/tdm/tdm-core.c
+ *
+ * Copyright (C) 2012 Freescale Semiconductor, Inc, All rights reserved.
+ *
+ * TDM core is the interface between TDM clients and TDM devices.
+ * It is also intended to serve as an interface for line controld
+ * devices later on.
+ *
+ * Author:Hemant Agrawal <hemant@freescale.com>
+ *	Rajesh Gumasta <rajesh.gumasta@freescale.com>
+ *
+ * Modified by Sandeep Kr Singh <sandeep@freescale.com>
+ *		Poonam Aggarwal <poonam.aggarwal@freescale.com>
+ * 1. Added framework based initilization of device.
+ * 2. All the init/run time configuration is now done by framework.
+ * 3. Added channel level operations.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ * 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.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* if read write debug required */
+#undef TDM_CORE_DEBUG
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/tdm.h>
+#include <linux/init.h>
+#include <linux/idr.h>
+#include <linux/mutex.h>
+#include <linux/completion.h>
+#include <linux/hardirq.h>
+#include <linux/irqflags.h>
+#include <linux/list.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+
+
+static DEFINE_MUTEX(tdm_core_lock);
+static DEFINE_MUTEX(tdm_adapter_lock);
+static DEFINE_IDR(tdm_adapter_idr);
+/* List of TDM adapters registered with TDM framework */
+LIST_HEAD(tdm_adapter_list);
+
+/* List of TDM phys registered with TDM framework */
+LIST_HEAD(tdm_phy_list);
+
+/* List of TDM clients registered with TDM framework */
+LIST_HEAD(tdm_driver_list);
+
+/* In case the previous data is not fetched by the client driver, the
+ * de-interleaving function will  discard the old data and rewrite the
+ * new data */
+static int use_latest_tdm_data = 1;
+
+/* this tasklet is created for each adapter instance */
+static void tdm_data_tasklet_fn(unsigned long);
+
+/* tries to match client driver with the adapter */
+static int tdm_device_match(struct tdm_driver *driver, struct tdm_adapter *adap)
+{
+	/* match on an id table if there is one */
+	if (driver->id_table && driver->id_table->name[0]) {
+		if (!(strcmp(driver->id_table->name, adap->name)))
+			return (int)driver->id_table;
+	}
+	return TDM_E_OK;
+}
+
+static int tdm_attach_driver_adap(struct tdm_driver *driver,
+					struct tdm_adapter *adap)
+{
+	int ret = TDM_E_OK;
+	/* if driver is already attached to any other adapter, return*/
+	if (driver->adapter && (driver->adapter != adap))
+		return ret;
+
+	driver->adapter = adap;
+
+	if (driver->attach_adapter) {
+		ret = driver->attach_adapter(adap);
+		if (ret < 0) {
+			pr_err("attach_adapter failed for driver [%s] err:%d\n"
+				, driver->name, ret);
+			return ret;
+		}
+	}
+	adap->drv_count++;
+
+	if (!adap->tasklet_conf) {
+		tasklet_init(&adap->tdm_data_tasklet, tdm_data_tasklet_fn,
+						(unsigned long)adap);
+		adap->tasklet_conf = 1;
+	}
+
+	return ret;
+}
+
+/* Detach client driver and adapter */
+static int tdm_detach_driver_adap(struct tdm_driver *driver,
+					struct tdm_adapter *adap)
+{
+	int res = TDM_E_OK;
+
+	if (!driver->adapter || (driver->adapter != adap))
+		return TDM_E_OK;
+
+	if (!driver->detach_adapter)
+		return TDM_E_OK;
+
+	adap->drv_count--;
+
+	/* If no more driver is registed with the adapter*/
+	if (!adap->drv_count && adap->tasklet_conf) {
+		tasklet_disable(&adap->tdm_data_tasklet);
+		tasklet_kill(&adap->tdm_data_tasklet);
+		adap->tasklet_conf = 0;
+	}
+
+	if (driver->detach_adapter) {
+		if (driver->detach_adapter(adap))
+			pr_err("detach_adapter failed for driver [%s]\n",
+				driver->name);
+	}
+
+	driver->adapter = NULL;
+	return res;
+}
+
+/* TDM adapter Registration/De-registration with TDM framework */
+
+static int tdm_register_adapter(struct tdm_adapter *adap)
+{
+	int res = TDM_E_OK;
+	struct tdm_driver *driver, *next;
+
+	mutex_init(&adap->adap_lock);
+	INIT_LIST_HEAD(&adap->myports);
+	spin_lock_init(&adap->portlist_lock);
+
+	adap->drv_count = 0;
+	adap->tasklet_conf = 0;
+
+	list_add_tail(&adap->list, &tdm_adapter_list);
+
+	/* initialization of driver by framework in default configuration */
+	init_config_adapter(adap);
+
+	/* Notify drivers */
+	pr_info("adapter [%s] registered\n", adap->name);
+	mutex_lock(&tdm_core_lock);
+	list_for_each_entry_safe(driver, next, &tdm_driver_list, list) {
+		if (tdm_device_match(driver, adap)) {
+			res = tdm_attach_driver_adap(driver, adap);
+			if (res == TDM_E_OK) {
+				pr_info("Driver(ID=%d) is "
+				"attached with Adapter %s(ID = %d)\n",
+				driver->id, adap->name, adap->id);
+			} else {
+				pr_err("Driver(ID=%d) is unable "
+				"to attach with Adapter %s(ID = %d)\n",
+				driver->id, adap->name, adap->id);
+			}
+		}
+	}
+	mutex_unlock(&tdm_core_lock);
+
+	return res;
+}
+
+/*
+ * tdm_add_adapter - declare tdm adapter, use dynamic device number
+ * @adapter: the adapter to add
+ * Context: can sleep
+ *
+ * This routine is used to declare a TDM adapter
+ * When this returns zero, a new device number will be allocated and stored
+ * in adap->id, and the specified adapter became available for the clients.
+ * Otherwise, a negative errno value is returned.
+ */
+int tdm_add_adapter(struct tdm_adapter *adapter)
+{
+	int id, res = TDM_E_OK;
+	if (!adapter) {
+		pr_err("%s:Invalid handle\n", __func__);
+		return -EINVAL;
+	}
+
+retry:
+	if (idr_pre_get(&tdm_adapter_idr, GFP_KERNEL) == 0)
+		return -ENOMEM;
+
+	mutex_lock(&tdm_core_lock);
+	res = idr_get_new(&tdm_adapter_idr, adapter, &id);
+	mutex_unlock(&tdm_core_lock);
+
+	if (res < 0) {
+		if (res == -EAGAIN)
+			goto retry;
+		return res;
+	}
+
+	adapter->id = id;
+	return tdm_register_adapter(adapter);
+}
+EXPORT_SYMBOL(tdm_add_adapter);
+
+/**
+ * tdm_del_adapter - unregister TDM adapter
+ * @adap: the adapter being unregistered
+ *
+ * This unregisters an TDM adapter which was previously registered
+ * by @tdm_add_adapter.
+ */
+int tdm_del_adapter(struct tdm_adapter *adap)
+{
+	int res = TDM_E_OK;
+	struct tdm_adapter *found;
+	struct tdm_driver *driver, *next;
+
+	if (!adap) {
+		pr_err("%s:Invalid handle\n", __func__);
+		return -EINVAL;
+	}
+
+	/* First make sure that this adapter was ever added */
+	mutex_lock(&tdm_core_lock);
+	found = idr_find(&tdm_adapter_idr, adap->id);
+	mutex_unlock(&tdm_core_lock);
+	if (found != adap) {
+		pr_err("tdm-core: attempting to delete unregistered "
+			 "adapter [%s]\n", adap->name);
+		return -EINVAL;
+	}
+
+	/*disable and kill the data processing tasklet */
+	if (adap->tasklet_conf) {
+		tasklet_disable(&adap->tdm_data_tasklet);
+		tasklet_kill(&adap->tdm_data_tasklet);
+		adap->tasklet_conf = 0;
+	}
+
+	/* Detach any active ports. This can't fail, thus we do not
+	   checking the returned value. */
+	mutex_lock(&tdm_core_lock);
+	list_for_each_entry_safe(driver, next, &tdm_driver_list, list) {
+		if (tdm_device_match(driver, adap)) {
+			tdm_detach_driver_adap(driver, adap);
+			pr_info(
+			"Driver(ID=%d) is detached from Adapter %s(ID = %d)\n",
+				 driver->id, adap->name, adap->id);
+		}
+	}
+	mutex_unlock(&tdm_core_lock);
+
+	mutex_lock(&tdm_core_lock);
+	idr_remove(&tdm_adapter_idr, adap->id);
+	mutex_unlock(&tdm_core_lock);
+
+	pr_debug("adapter [%s] unregistered\n", adap->name);
+
+	list_del(&adap->list);
+	/* Clear the device structure in case this adapter is ever going to be
+	   added again */
+	adap->parent = NULL;
+
+	return res;
+}
+EXPORT_SYMBOL(tdm_del_adapter);
+
+/* TDM Client Drivers Registration/De-registration Functions */
+int tdm_register_driver(struct tdm_driver *driver)
+{
+	int res = TDM_E_OK;
+	struct tdm_adapter *adap, *next;
+
+	list_add_tail(&driver->list, &tdm_driver_list);
+
+	mutex_lock(&tdm_core_lock);
+	/* Walk the adapters that are already present */
+	list_for_each_entry_safe(adap, next, &tdm_adapter_list, list) {
+		if (tdm_device_match(driver, adap)) {
+			res = tdm_attach_driver_adap(driver, adap);
+			if (res == TDM_E_OK) {
+				pr_info("TDM Driver(ID=%d)is attached with "
+					"Adapter%s(ID = %d) drv_count=%d",
+					driver->id, adap->name, adap->id,
+					adap->drv_count);
+			} else {
+				pr_err("TDM Driver(ID=%d) unable to attach "
+					"to Adapter%s(ID = %d) drv_count=%d",
+					driver->id, adap->name, adap->id,
+					adap->drv_count);
+			}
+		break;
+		}
+	}
+	mutex_unlock(&tdm_core_lock);
+
+	return res;
+}
+EXPORT_SYMBOL(tdm_register_driver);
+
+/*
+ * tdm_unregister_driver - unregister TDM client driver from TDM framework
+ * @driver: the driver being unregistered
+ */
+void tdm_unregister_driver(struct tdm_driver *driver)
+{
+	if (!driver) {
+		pr_err("%s:Invalid handle\n", __func__);
+		return;
+	}
+       /* A driver can register to only one adapter,
+	* so no need to browse the list */
+	mutex_lock(&tdm_core_lock);
+	tdm_detach_driver_adap(driver, driver->adapter);
+	mutex_unlock(&tdm_core_lock);
+
+	list_del(&driver->list);
+
+	pr_debug("tdm-core: driver [%s] unregistered\n", driver->name);
+}
+EXPORT_SYMBOL(tdm_unregister_driver);
+
+/* TDM Framework init and exit */
+static int __init tdm_init(void)
+{
+	pr_info("%s\n", __func__);
+	return TDM_E_OK;
+}
+
+static void __exit tdm_exit(void)
+{
+	pr_info("%s\n", __func__);
+	return;
+}
+
+/* We must initialize early, because some subsystems register tdm drivers
+ * in subsys_initcall() code, but are linked (and initialized) before tdm.
+ */
+postcore_initcall(tdm_init);
+module_exit(tdm_exit);
+
+
+/* Interface to the tdm device/adapter */
+
+/* tdm_adap_send - issue a TDM write
+ * @adap: Handle to TDM device
+ * @buf: Data that will be written to the TDM device
+ * @count: How many bytes to write
+ *
+ * Returns negative errno, or else the number of bytes written.
+ */
+int tdm_adap_send(struct tdm_adapter *adap, void **buf, int count)
+{
+	int res;
+
+	if ((adap == NULL) || (buf == NULL)) { /* invalid handle*/
+		pr_err("%s: Invalid Handle\n", __func__);
+		return -ENXIO;
+	}
+
+	if (adap->algo->tdm_write)
+		res = adap->algo->tdm_write(adap, buf, count);
+	else {
+		pr_err("TDM level write not supported\n");
+		return -EOPNOTSUPP;
+	}
+
+	/* If everything went ok (i.e. frame transmitted), return #bytes
+	   transmitted, else error code. */
+	return (res == 1) ? count : res;
+}
+EXPORT_SYMBOL(tdm_adap_send);
+
+/**
+ * tdm_adap_recv - issue a TDM read
+ * @adap: Handle to TDM device
+ * @buf: Where to store data read from TDM device
+ *
+ * Returns negative errno, or else the number of bytes read.
+ */
+int tdm_adap_recv(struct tdm_adapter *adap, void **buf)
+{
+	int res;
+
+	if (adap->algo->tdm_read)
+		res = adap->algo->tdm_read(adap, (u16 **)buf);
+	else {
+		pr_err("TDM level read not supported\n");
+		return -EOPNOTSUPP;
+	}
+	/* If everything went ok (i.e. frame received), return #bytes
+	   transmitted, else error code. */
+	return res;
+}
+
+/**
+ * tdm_adap_get_write_buf - get next write TDM device buffer
+ * @adap: Handle to TDM device
+ * @buf: pointer to TDM device buffer
+ *
+ * Returns negative errno, or else size of the write buffer.
+ */
+int tdm_adap_get_write_buf(struct tdm_adapter *adap, void **buf)
+{
+	int res;
+
+	if (adap->algo->tdm_get_write_buf) {
+		res = adap->algo->tdm_get_write_buf(adap, (u16 **)buf);
+	} else {
+		pr_err("TDM level write buf get not supported\n");
+		return -EOPNOTSUPP;
+	}
+	/* If everything went ok (i.e. 1 msg received), return #bytes
+	   transmitted, else error code. */
+	return res;
+}
+EXPORT_SYMBOL(tdm_adap_get_write_buf);
+
+int tdm_adap_enable(struct tdm_driver *drv)
+{
+	int res;
+	struct tdm_adapter *adap;
+	if (drv == NULL) { /* invalid handle*/
+		pr_err("%s: Invalid Handle\n", __func__);
+		return -ENXIO;
+	}
+	adap = drv->adapter;
+
+	if (adap->algo->tdm_enable) {
+		res = adap->algo->tdm_enable(adap);
+	} else {
+		pr_err("TDM level enable not supported\n");
+		return -EOPNOTSUPP;
+	}
+	return res;
+}
+EXPORT_SYMBOL(tdm_adap_enable);
+
+int tdm_adap_disable(struct tdm_driver *drv)
+{
+	int res;
+	struct tdm_adapter *adap;
+	if (drv == NULL) { /* invalid handle*/
+		pr_err("%s: Invalid Handle\n", __func__);
+		return -ENXIO;
+	}
+	adap = drv->adapter;
+
+	if (adap->algo->tdm_disable) {
+		res = adap->algo->tdm_disable(adap);
+	} else {
+		pr_err("TDM level enable not supported\n");
+		return -EOPNOTSUPP;
+	}
+	return res;
+}
+EXPORT_SYMBOL(tdm_adap_disable);
+
+struct tdm_adapter *tdm_get_adapter(int id)
+{
+	struct tdm_adapter *adapter;
+
+	mutex_lock(&tdm_core_lock);
+	adapter = idr_find(&tdm_adapter_idr, id);
+	if (adapter && !try_module_get(adapter->owner))
+		adapter = NULL;
+
+	mutex_unlock(&tdm_core_lock);
+
+	return adapter;
+}
+EXPORT_SYMBOL(tdm_get_adapter);
+
+void tdm_put_adapter(struct tdm_adapter *adap)
+{
+	module_put(adap->owner);
+}
+EXPORT_SYMBOL(tdm_put_adapter);
+
+
+/* Port Level APIs of TDM Framework */
+unsigned int tdm_port_open(struct tdm_driver *driver, void **h_port)
+{
+	struct tdm_port *port;
+	struct tdm_adapter *adap;
+	unsigned long		flags;
+	int res = TDM_E_OK;
+
+	if (driver == NULL) {
+		pr_err("driver NULL\n");
+		return -ENODEV;
+	}
+	if (driver->adapter == NULL) {
+		pr_err("adapter NULL\n");
+		return -ENODEV;
+	}
+
+	adap = tdm_get_adapter(driver->adapter->id);
+	if (!adap)
+		return -ENODEV;
+
+	/* This creates an anonymous tdm_port, which may later be
+	 * pointed to some slot.
+	 *
+	 */
+	port = kzalloc(sizeof(*port), GFP_KERNEL);
+	if (!port) {
+		res = -ENOMEM;
+		goto out;
+	}
+
+	port->rx_max_frames = NUM_SAMPLES_PER_FRAME;
+	port->port_cfg.port_mode = e_TDM_PORT_CHANNELIZED;
+
+	port->in_use = 1;
+
+	snprintf(driver->name, TDM_NAME_SIZE, "tdm-dev");
+	port->driver = driver;
+	port->adapter = adap;
+
+	spin_lock_irqsave(&adap->portlist_lock, flags);
+	list_add_tail(&port->list, &adap->myports);
+	spin_unlock_irqrestore(&adap->portlist_lock, flags);
+
+	INIT_LIST_HEAD(&port->mychannels);
+
+	*h_port = port;
+
+out:
+	return res;
+}
+EXPORT_SYMBOL(tdm_port_open);
+
+unsigned int tdm_port_close(void *h_port)
+{
+	struct tdm_adapter *adap;
+	struct tdm_driver *driver;
+	struct tdm_port *port;
+	struct tdm_channel *temp, *channel;
+	unsigned long		flags;
+	int res = TDM_E_OK;
+	port = (struct tdm_port *)h_port;
+
+	if (port == NULL) { /* invalid handle*/
+		pr_err("Invalid Handle");
+		return -ENXIO;
+	}
+
+	driver =  port->driver;
+
+	if (driver == NULL) {
+		pr_err("driver NULL\n");
+		res = -ENODEV;
+		goto out;
+	}
+	if (driver->adapter == NULL) {
+		pr_err("adapter NULL\n");
+		res = -ENODEV;
+		goto out;
+	}
+
+	list_for_each_entry_safe(channel, temp, &port->mychannels, list) {
+	if (channel)
+		if (channel->in_use) {
+			pr_err("%s: Cannot close port. Channel in use\n",
+								__func__);
+			res = -ENXIO;
+			goto out;
+			}
+	}
+	adap = driver->adapter;
+
+	spin_lock_irqsave(&adap->portlist_lock, flags);
+	list_del(&port->list);
+	spin_unlock_irqrestore(&adap->portlist_lock, flags);
+
+	if (port->p_port_data != NULL) {
+		int i;
+		struct tdm_bd *ch_bd;
+
+		/* If the tdm is in channelised mode,
+		de-allocate the channelised buffer */
+		ch_bd = &(port->p_port_data->rx_data_fifo[0]);
+		for (i = 0; ch_bd && i < TDM_CH_RX_BD_RING_SIZE; i++) {
+			ch_bd->flag = 0;
+			ch_bd++;
+		}
+		ch_bd = &(port->p_port_data->tx_data_fifo[0]);
+		for (i = 0; ch_bd && i < TDM_CH_TX_BD_RING_SIZE; i++) {
+			ch_bd->flag = 0;
+			ch_bd++;
+		}
+		kfree(port->p_port_data);
+	}
+	kfree(port);
+	return res;
+out:
+	if (port)
+		kfree(port->p_port_data);
+	kfree(port);
+	return res;
+}
+EXPORT_SYMBOL(tdm_port_close);
+
+unsigned int tdm_channel_read(void *h_port, void *h_channel,
+				void *p_data, u16 *size)
+{
+	struct tdm_port *port;
+	struct tdm_channel *channel;
+	struct tdm_bd *rx_bd;
+	unsigned long flags;
+	int i, res = TDM_E_OK;
+	unsigned short *buf, *buf1;
+	port = (struct tdm_port *)h_port;
+	channel = (struct tdm_channel *)h_channel;
+
+	if ((port && channel) == 0) { /* invalid handle*/
+		pr_err("%s:Invalid Handle\n", __func__);
+		return -ENXIO;
+	}
+
+	if (!port->in_use)
+		return -EIO;
+	if (!channel->p_ch_data || !channel->in_use)
+		return -EIO;
+
+	spin_lock_irqsave(&channel->p_ch_data->rx_channel_lock, flags);
+	rx_bd = channel->p_ch_data->rx_out_data;
+
+	if (rx_bd->flag) {
+		*size = rx_bd->length;
+		buf = (u16 *) p_data;
+		buf1 = (u16 *)rx_bd->p_data;
+		for (i = 0; i < NUM_SAMPLES_PER_FRAME; i++)
+			buf[i] = buf1[i];
+		rx_bd->flag = 0;
+		rx_bd->offset = 0;
+		channel->p_ch_data->rx_out_data = (rx_bd->wrap) ?
+				channel->p_ch_data->rx_data_fifo : rx_bd + 1;
+
+	} else {
+		spin_unlock_irqrestore(&channel->p_ch_data->rx_channel_lock,
+						flags);
+		pr_info("No Data Available");
+		return -EAGAIN;
+	}
+	spin_unlock_irqrestore(&channel->p_ch_data->rx_channel_lock, flags);
+
+	return res;
+}
+EXPORT_SYMBOL(tdm_channel_read);
+
+
+unsigned int tdm_channel_write(void *h_port, void *h_channel,
+				void *p_data, u16 size)
+{
+	struct tdm_port *port;
+	struct tdm_channel *channel;
+	struct tdm_bd *tx_bd;
+	unsigned long flags;
+	int err = TDM_E_OK;
+	port = (struct tdm_port *)h_port;
+	channel = (struct tdm_channel *)h_channel;
+#ifdef TDM_CORE_DEBUG
+	bool data_flag = 0;
+#endif
+
+	if ((port && channel) == 0) { /* invalid handle*/
+		pr_err("Invalid Handle");
+		return -ENXIO;
+	}
+
+	if (p_data == NULL) { /* invalid data*/
+		pr_err("Invalid Data");
+		return -EFAULT;
+	}
+
+	if (!port->in_use)
+		return -EIO;
+	if (!channel->p_ch_data || !channel->in_use)
+		return -EIO;
+
+	spin_lock_irqsave(&channel->p_ch_data->tx_channel_lock, flags);
+	tx_bd = channel->p_ch_data->tx_in_data;
+
+	if (!tx_bd->flag) {
+		tx_bd->length = size;
+		memcpy(tx_bd->p_data, p_data,
+			size * port->adapter->adapt_cfg.slot_width);
+		tx_bd->flag = 1;
+		tx_bd->offset = 0;
+		channel->p_ch_data->tx_in_data = (tx_bd->wrap) ?
+				channel->p_ch_data->tx_data_fifo : tx_bd+1;
+		port->port_stat.tx_pkt_count++;
+#ifdef TDM_CORE_DEBUG
+		data_flag = 1;
+#endif
+	} else {
+		spin_unlock_irqrestore(&channel->p_ch_data->tx_channel_lock,
+						flags);
+		port->port_stat.tx_pkt_drop_count++;
+		pr_err("E_NO_MEMORY -Failed Transmit");
+		return -ENOMEM;
+	}
+	spin_unlock_irqrestore(&channel->p_ch_data->tx_channel_lock, flags);
+
+#ifdef	TDM_CORE_DEBUG
+	if (data_flag) {
+		int k;
+		pr_info("\nTX port:%d - Write - Port TX-%d\n",
+						port->port_id, size);
+		for (k = 0; k < size; k++)
+			pr_info("%x", p_data[k]);
+		pr_info("\n");
+	}
+#endif
+	return err;
+}
+EXPORT_SYMBOL(tdm_channel_write);
+
+/* Driver Function for select and poll. Based on Channel, it sleeps on
+ * waitqueue */
+unsigned int tdm_ch_poll(void *h_channel, unsigned int wait_time)
+{
+	struct tdm_channel *channel;
+	unsigned long timeout = msecs_to_jiffies(wait_time);
+	channel = h_channel;
+
+	if (!channel->p_ch_data || !channel->in_use)
+		return -EIO;
+
+	if (channel->p_ch_data->rx_out_data->flag) {
+		pr_debug("Data Available");
+		return TDM_E_OK;
+	}
+	if (timeout) {
+		wait_event_interruptible_timeout(channel->ch_wait_queue,
+					  channel->p_ch_data->rx_out_data->flag,
+					  timeout);
+
+		if (channel->p_ch_data->rx_out_data->flag) {
+			pr_debug("Data Available");
+			return TDM_E_OK;
+		}
+	}
+	return -EAGAIN;
+}
+EXPORT_SYMBOL(tdm_ch_poll);
+
+unsigned int tdm_port_get_stats(void *h_port, struct tdm_port_stats *portStat)
+{
+	struct tdm_port *port;
+	int port_num;
+	port = (struct tdm_port *)h_port;
+
+	if (port == NULL || portStat == NULL) { /* invalid handle*/
+		pr_err("Invalid Handle");
+		return -ENXIO;
+	}
+	port_num =  port->port_id;
+
+	memcpy(portStat, &port->port_stat, sizeof(struct tdm_port_stats));
+
+	pr_info("TDM Port %d Get Stats", port_num);
+
+	return TDM_E_OK;
+}
+EXPORT_SYMBOL(tdm_port_get_stats);
+
+/* Data handling functions */
+
+static int tdm_data_rx_deinterleave(struct tdm_adapter *adap)
+{
+	struct tdm_port *port, *next;
+	struct tdm_channel *channel, *temp;
+	struct tdm_bd	*ch_bd;
+
+	int i, buf_size, ch_data_len;
+	u16 *input_tdm_buffer;
+	u16 *pcm_buffer;
+	int slot_width;
+	int frame_ch_data_size;
+	bool ch_data;
+	int bytes_in_fifo_per_frame;
+	int bytes_slot_offset;
+
+	ch_data_len = NUM_SAMPLES_PER_FRAME;
+	frame_ch_data_size = NUM_SAMPLES_PER_FRAME;
+	ch_data = 0;
+
+	if (!adap) { /* invalid handle*/
+		pr_err("%s: Invalid Handle\n", __func__);
+		return -ENXIO;
+	}
+
+	slot_width = adap->adapt_cfg.slot_width;
+	buf_size = tdm_adap_recv(adap, (void **)&input_tdm_buffer);
+	if (buf_size <= 0 || !input_tdm_buffer)
+		return -EINVAL;
+
+	bytes_in_fifo_per_frame = buf_size/frame_ch_data_size;
+	bytes_slot_offset = bytes_in_fifo_per_frame/slot_width;
+
+	/* de-interleaving for all ports*/
+	list_for_each_entry_safe(port, next, &adap->myports, list) {
+
+		/* if the port is not open */
+		if (!port->in_use)
+			continue;
+
+		list_for_each_entry_safe(channel, temp, &port->mychannels,
+							list) {
+		/* if the channel is not open */
+		if (!channel->in_use || !channel->p_ch_data)
+			continue;
+		ch_bd = channel->p_ch_data->rx_in_data;
+		spin_lock(&channel->p_ch_data->rx_channel_lock);
+			/*if old data is to be discarded */
+		if (use_latest_tdm_data)
+			if (ch_bd->flag) {
+				ch_bd->flag = 0;
+				ch_bd->offset = 0;
+				if (ch_bd == channel->p_ch_data->rx_out_data)
+					channel->p_ch_data->rx_out_data =
+						ch_bd->wrap ?
+						channel->p_ch_data->rx_data_fifo
+						: ch_bd+1;
+					port->port_stat.rx_pkt_drop_count++;
+				}
+			/* if the bd is empty */
+			if (!ch_bd->flag) {
+				if (ch_bd->offset == 0)
+					ch_bd->length = port->rx_max_frames;
+
+				pcm_buffer = ch_bd->p_data + ch_bd->offset;
+				/* De-interleaving the data */
+				for (i = 0; i < ch_data_len; i++) {
+					pcm_buffer[i]
+					= input_tdm_buffer[i*bytes_slot_offset +
+						channel->ch_id];
+				}
+				ch_bd->offset += ch_data_len * slot_width;
+
+				if (ch_bd->offset >=
+					(ch_bd->length - frame_ch_data_size)*
+						(adap->adapt_cfg.slot_width)) {
+					ch_bd->flag = 1;
+					ch_bd->offset = 0;
+					channel->p_ch_data->rx_in_data =
+						ch_bd->wrap ?
+						channel->p_ch_data->rx_data_fifo
+						: ch_bd+1;
+					ch_data = 1;
+					wake_up_interruptible
+						(&channel->ch_wait_queue);
+				}
+			} else {
+				port->port_stat.rx_pkt_drop_count++;
+			}
+		spin_unlock(&channel->p_ch_data->rx_channel_lock);
+		}
+
+		if (ch_data) {
+			/*	Wake up the Port Data Poll event */
+#ifdef	TDM_CORE_DEBUG
+			pr_info("Port RX-%d-%d\n", channel->ch_id, ch_data_len);
+			for (i = 0; i < ch_data_len; i++)
+				pr_info("%x", pcm_buffer[i]);
+			pr_info("\n");
+#endif
+			port->port_stat.rx_pkt_count++;
+			ch_data = 0;
+		}
+	}
+	return TDM_E_OK;
+}
+
+static int tdm_data_tx_interleave(struct tdm_adapter *adap)
+{
+	struct tdm_port *port, *next;
+	struct tdm_channel *channel, *temp;
+	struct tdm_bd	*ch_bd;
+	int i, buf_size, ch_data_len = NUM_SAMPLES_PER_FRAME;
+	bool last_data = 0;
+	u16 *output_tdm_buffer;
+	u16 *pcm_buffer;
+	int frame_ch_data_size = NUM_SAMPLES_PER_FRAME;
+	int bytes_in_fifo_per_frame;
+	int bytes_slot_offset;
+
+#ifdef TDM_CORE_DEBUG
+	u8	data_flag = 0;
+#endif
+
+	if (adap == NULL) { /* invalid handle*/
+		pr_err("%s: Invalid Handle\n", __func__);
+		return -ENXIO;
+	}
+
+	buf_size = tdm_adap_get_write_buf(adap, (void **)&output_tdm_buffer);
+	if (buf_size <= 0 || !output_tdm_buffer)
+		return -EINVAL;
+
+	bytes_in_fifo_per_frame = buf_size/frame_ch_data_size;
+	bytes_slot_offset = bytes_in_fifo_per_frame/adap->adapt_cfg.slot_width;
+
+
+	memset(output_tdm_buffer, 0, sizeof(buf_size));
+
+	list_for_each_entry_safe(port, next, &adap->myports, list) {
+
+		/* check if the port is open */
+		if (!port->in_use)
+			continue;
+
+		list_for_each_entry_safe(channel, temp, &port->mychannels,
+								list) {
+		pr_debug("TX-Tdm %d (slots-)", channel->ch_id);
+
+
+		/* if the channel is open */
+		if (!channel->in_use || !channel->p_ch_data)
+			continue;
+
+		spin_lock(&channel->p_ch_data->tx_channel_lock);
+		if (!channel->in_use || !channel->p_ch_data)
+			continue;
+			ch_bd = channel->p_ch_data->tx_out_data;
+			if (ch_bd->flag) {
+				pcm_buffer = (u16 *)((uint8_t *)ch_bd->p_data +
+						ch_bd->offset);
+				/*if the buffer has less frames than required */
+				if (frame_ch_data_size >=
+					((ch_bd->length) - (ch_bd->offset/
+						adap->adapt_cfg.slot_width))) {
+					ch_data_len =
+					(ch_bd->length) - (ch_bd->offset/
+						adap->adapt_cfg.slot_width);
+					last_data = 1;
+				} else {
+					ch_data_len = frame_ch_data_size;
+				}
+				/* Interleaving the data */
+				for (i = 0; i < ch_data_len; i++) {
+					/* TODO- need to be genric for any size
+					   assignment*/
+					output_tdm_buffer[channel->ch_id +
+						bytes_slot_offset * i] =
+								pcm_buffer[i];
+				}
+				/* If all the data of this buffer is
+							transmitted */
+				if (last_data) {
+					ch_bd->flag = 0;
+					ch_bd->offset = 0;
+					channel->p_ch_data->tx_out_data =
+						ch_bd->wrap ?
+						channel->p_ch_data->tx_data_fifo
+						: ch_bd+1;
+					port->port_stat.tx_pkt_conf_count++;
+				} else {
+					ch_bd->offset += ch_data_len *
+						(adap->adapt_cfg.slot_width);
+				}
+#ifdef	TDM_CORE_DEBUG
+				data_flag = 1;
+#endif
+			}
+		spin_unlock(&channel->p_ch_data->tx_channel_lock);
+		}
+	}
+
+#ifdef	TDM_CORE_DEBUG
+	if (data_flag) {
+		pr_info("TX-TDM Interleaved Data-\n");
+		for (i = 0; i < 64; i++)
+			pr_info("%x", output_tdm_buffer[i]);
+		pr_info("\n");
+	  }
+#endif
+	return TDM_E_OK;
+}
+
+/* Channel Level APIs of TDM Framework */
+int tdm_channel_open(u16 chanid, u16 ch_width, struct tdm_port *port,
+				void **h_channel)
+{
+	struct tdm_channel *channel, *temp;
+	unsigned long		flags;
+	struct tdm_ch_data	*p_ch_data;
+	int res = TDM_E_OK;
+
+	if (!(port && h_channel)) {
+		pr_err("%s: Invalid handle\n", __func__);
+		return -EINVAL;
+	}
+
+	if (ch_width != 1) {
+		pr_err("%s: Mode not supported\n", __func__);
+		return -EINVAL;
+	}
+
+	list_for_each_entry_safe(channel, temp, &port->mychannels, list) {
+		if (channel->ch_id == chanid) {
+			pr_err("%s: Channel %d already open\n",
+						__func__, chanid);
+			return -EINVAL;
+		}
+	}
+
+	channel = kzalloc(sizeof(*channel), GFP_KERNEL);
+	if (!channel) {
+		res = -ENOMEM;
+		goto out;
+	}
+
+	init_waitqueue_head(&channel->ch_wait_queue);
+	p_ch_data = kzalloc(sizeof(struct tdm_ch_data), GFP_KERNEL);
+	if (!p_ch_data) {
+		res = -ENOMEM;
+		goto outdata;
+	}
+
+	p_ch_data->rx_data_fifo[TDM_CH_RX_BD_RING_SIZE-1].wrap = 1;
+	p_ch_data->tx_data_fifo[TDM_CH_TX_BD_RING_SIZE-1].wrap = 1;
+
+	p_ch_data->rx_in_data = p_ch_data->rx_data_fifo;
+	p_ch_data->rx_out_data = p_ch_data->rx_data_fifo;
+	p_ch_data->tx_in_data = p_ch_data->tx_data_fifo;
+	p_ch_data->tx_out_data = p_ch_data->tx_data_fifo;
+	spin_lock_init(&p_ch_data->rx_channel_lock);
+	spin_lock_init(&p_ch_data->tx_channel_lock);
+
+	channel->p_ch_data = p_ch_data;
+
+	channel->ch_id = chanid;
+	channel->ch_cfg.first_slot = chanid;
+	channel->ch_cfg.num_slots = 1;	/* This is 1 for channelized mode and
+						configurable for other modes */
+	channel->port = port;
+	channel->in_use = 1;
+
+	spin_lock_irqsave(&port->ch_list_lock, flags);
+	list_add_tail(&channel->list, &port->mychannels);
+	spin_unlock_irqrestore(&port->ch_list_lock, flags);
+
+	*h_channel = channel;
+
+	return res;
+
+outdata:
+	kfree(channel);
+out:
+	return res;
+}
+EXPORT_SYMBOL(tdm_channel_open);
+
+int tdm_channel_close(u16 chanid, u16 ch_width, struct tdm_port *port,
+				struct tdm_channel *h_channel)
+{
+	struct tdm_channel *channel;
+	unsigned long		flags;
+	int res = TDM_E_OK;
+	channel = h_channel;
+
+	if (!(port && channel)) {
+		pr_err("%s: Invalid handle\n", __func__);
+		res = -EINVAL;
+		goto out;
+	}
+
+	if (ch_width != 1) {
+		pr_err("%s: Mode not supported\n", __func__);
+		res = -EINVAL;
+		goto out;
+	}
+
+	spin_lock_irqsave(&port->ch_list_lock, flags);
+	list_del(&channel->list);
+	spin_unlock_irqrestore(&port->ch_list_lock, flags);
+
+out:
+	if (channel)
+		kfree(channel->p_ch_data);
+	kfree(channel);
+	return res;
+}
+EXPORT_SYMBOL(tdm_channel_close);
+
+void init_config_adapter(struct tdm_adapter *adap)
+{
+	struct fsl_tdm_adapt_cfg default_adapt_cfg = {
+		.loopback = e_TDM_PROCESS_NORMAL,
+		.num_ch = NUM_CHANNELS,
+		.ch_size_type = CHANNEL_16BIT_LIN,
+		.frame_len = NUM_SAMPLES_PER_FRAME,
+		.num_frames = NUM_SAMPLES_PER_FRAME,
+		.adap_mode = e_TDM_ADAPTER_MODE_NONE
+			 };
+
+	default_adapt_cfg.slot_width = default_adapt_cfg.ch_size_type/3 + 1;
+
+	memcpy(&adap->adapt_cfg, &default_adapt_cfg,
+		sizeof(struct fsl_tdm_adapt_cfg));
+
+	return;
+}
+EXPORT_SYMBOL(init_config_adapter);
+
+static void tdm_data_tasklet_fn(unsigned long data)
+{
+	struct tdm_adapter *adapter;
+	adapter = (struct tdm_adapter *)data;
+	if (adapter != NULL) {
+		tdm_data_tx_interleave(adapter);
+		tdm_data_rx_deinterleave(adapter);
+	}
+}
+
+/*
+ * add_tdm_phy - declare tdm phy, use dynamic device number
+ * @tdm_phy: tdm_phy to be added
+ * Context: can sleep
+ * This routine is used to declare a TDM phy device and add it to the list of
+ * avalable tdm phy devices
+ */
+int add_tdm_phy(struct tdm_phy *tdm_phy)
+{
+	int res = TDM_E_OK;
+	int index;
+	struct tdm_adapter *adap, *next;
+	list_add_tail(&tdm_phy->list, &tdm_phy_list);
+	mutex_lock(&tdm_core_lock);
+	list_for_each_entry_safe(adap, next, &tdm_adapter_list, list) {
+		/* Check if any adapter has our phandle */
+		for (index = 0; index < adap->num_tdm_phy; index++)
+			if (*(int *)tdm_phy->phandle_prop ==
+					*((int *)adap->phandle_prop) + index) {
+				mutex_unlock(&tdm_core_lock);
+				return attach_phy_adapter(adap, tdm_phy, index);
+			}
+	}
+	mutex_unlock(&tdm_core_lock);
+	return res;
+}
+EXPORT_SYMBOL(add_tdm_phy);
+
+int attach_phy_adapter(struct tdm_adapter *adapter,
+			struct tdm_phy *tdm_phy, int phy_id)
+{
+	struct fsl_tdm_adapt_cfg *tdm_config;
+	tdm_phy->tdm_adapter = adapter;
+	adapter->tdm_phy[phy_id] = tdm_phy;
+	/* Get TDM configuration from adapter */
+	tdm_config = &adapter->adapt_cfg;
+	/*
+	 * Call config function of tdm phy with adapter configuration so that
+	 * it can configure itself based on the configuration passed by adapter
+	 */
+	tdm_phy->configure_phy(tdm_config);
+	return 1;
+}
+
+int get_tdm_phy(struct tdm_adapter *adapter, void *req_phy_handle)
+{
+	int index;
+	struct tdm_phy *tdm_phy, *next;
+	list_for_each_entry_safe(tdm_phy, next, &tdm_phy_list, list) {
+		for (index = 0; index < adapter->num_tdm_phy; index++)
+			if (*(int *)tdm_phy->phandle_prop ==
+				*((int *)req_phy_handle + index))
+				return attach_phy_adapter(adapter,
+							tdm_phy, index);
+			}
+	return 0;
+}
+EXPORT_SYMBOL(get_tdm_phy);
+
+MODULE_AUTHOR("Hemant Agrawal <hemant@freescale.com> and "
+	"Rajesh Gumasta <rajesh.gumasta@freescale.com>");
+MODULE_DESCRIPTION("TDM Driver Framework Core");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index fed3def..b8214f3 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -444,6 +444,17 @@  struct i2c_device_id {
 			__attribute__((aligned(sizeof(kernel_ulong_t))));
 };
 
+/* tdm */
+
+#define TDM_NAME_SIZE   20
+#define TDM_MODULE_PREFIX "tdm:"
+
+struct tdm_device_id {
+	char name[TDM_NAME_SIZE];
+	kernel_ulong_t driver_data      /* Data private to the driver */
+			__attribute__((aligned(sizeof(kernel_ulong_t))));
+};
+
 /* spi */
 
 #define SPI_NAME_SIZE	32
diff --git a/include/linux/tdm.h b/include/linux/tdm.h
new file mode 100644
index 0000000..555d22e
--- /dev/null
+++ b/include/linux/tdm.h
@@ -0,0 +1,379 @@ 
+/* include/linux/tdm.h
+ *
+ * Copyright (C) 2012 Freescale Semiconductor, Inc, All rights reserved.
+ *
+ * tdm.h - definitions for the tdm-device framework interface
+ *
+ * Author:Hemant Agrawal <hemant@freescale.com>
+ *	Rajesh Gumasta <rajesh.gumasta@freescale.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ * 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.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+
+#ifndef _LINUX_TDM_H
+#define _LINUX_TDM_H
+
+#ifdef __KERNEL__
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/device.h>	/* for struct device */
+#include <linux/sched.h>	/* for completion */
+#include <linux/mutex.h>
+#include <linux/interrupt.h>
+
+#define CHANNEL_8BIT_LIN	0	/* 8 bit linear */
+#define CHANNEL_8BIT_ULAW	1	/* 8 bit Mu-law */
+#define CHANNEL_8BIT_ALAW	2	/* 8 bit A-law */
+#define CHANNEL_16BIT_LIN	3	/* 16 bit Linear */
+
+#define NUM_CHANNELS		16
+#define NUM_SAMPLES_PER_MS	8		/* 8 samples per milli sec per
+						 channel. Req for voice data */
+#define NUM_MS			10
+#define NUM_SAMPLES_PER_FRAME	(NUM_MS * NUM_SAMPLES_PER_MS) /* Number of
+						samples for 1 client buffer */
+#define NUM_OF_TDM_BUF		3
+#define TDM_PHY_NAME_LEN	20
+#define MAX_TDM_PHY		10
+
+/* General options */
+
+struct tdm_adapt_algorithm;
+struct tdm_adapter;
+struct tdm_port;
+struct tdm_driver;
+
+/* Align addr on a size boundary - adjust address up if needed */
+/* returns min value greater than size which is multiple of alignment */
+static inline int ALIGN_SIZE(u64 size, u32 alignment)
+{
+	return (size + alignment - 1) & (~(alignment - 1));
+}
+
+/**
+ * struct tdm_driver - represent an TDM device driver
+ * @class: What kind of tdm device we instantiate (for detect)
+ * @id:Driver id
+ * @name: Name of the driver
+ * @attach_adapter: Callback for device addition (for legacy drivers)
+ * @detach_adapter: Callback for device removal (for legacy drivers)
+ * @probe: Callback for device binding
+ * @remove: Callback for device unbinding
+ * @shutdown: Callback for device shutdown
+ * @suspend: Callback for device suspend
+ * @resume: Callback for device resume
+ * @command: Callback for sending commands to device
+ * @id_table: List of TDM devices supported by this driver
+ * @list: List of drivers created (for tdm-core use only)
+ */
+struct tdm_driver {
+	unsigned int class;
+	unsigned int id;
+	char name[TDM_NAME_SIZE];
+
+	int (*attach_adapter)(struct tdm_adapter *);
+	int (*detach_adapter)(struct tdm_adapter *);
+
+	/* Standard driver model interfaces */
+	int (*probe)(const struct tdm_device_id *);
+	int (*remove)(void);
+
+	/* driver model interfaces that don't relate to enumeration */
+	void (*shutdown)(void);
+	int (*suspend)(pm_message_t mesg);
+	int (*resume)(void);
+
+	/* a ioctl like command that can be used to perform specific functions
+	 * with the device.
+	 */
+	int (*command)(unsigned int cmd, void *arg);
+
+	const struct tdm_device_id *id_table;
+
+	/* The associated adapter for this driver */
+	struct tdm_adapter *adapter;
+	struct list_head list;
+};
+
+/* tdm per port statistics structure, used for providing and storing tdm port
+ * statistics.
+ */
+struct tdm_port_stats {
+	unsigned int rx_pkt_count;	/* Rx frame count per channel */
+	unsigned int rx_pkt_drop_count;	/* Rx drop count per channel to
+					 clean space for new buffer */
+	unsigned int tx_pkt_count;	/* Tx frame count per channel */
+	unsigned int tx_pkt_conf_count;	/* Tx frame confirmation count per
+					 channel */
+	unsigned int tx_pkt_drop_count;	/* Tx drop count per channel due to
+					 queue full */
+};
+
+
+/* tdm Buffer Descriptor, used for Creating Interleaved and De-interleaved
+ * FIFOs
+ */
+struct tdm_bd {
+	unsigned char flag;		/* BD is full or empty */
+	unsigned char wrap;		/* BD is last in the queue */
+	unsigned short length;	/* Length of Data in BD */
+	/*TODO: use dyanmic memory */
+	unsigned short p_data[NUM_SAMPLES_PER_FRAME];	/* Data Pointer */
+	unsigned long offset;	/* Offset of the Data Pointer to be used */
+};
+
+#define TDM_CH_RX_BD_RING_SIZE	3
+#define TDM_CH_TX_BD_RING_SIZE	3
+
+/* tdm RX-TX Channelised Data */
+struct tdm_port_data {
+	struct tdm_bd rx_data_fifo[TDM_CH_RX_BD_RING_SIZE]; /* Rx Channel Data
+								BD Ring */
+	struct tdm_bd *rx_in_data;	/* Current Channel Rx BD to be filled by
+						de-interleave function */
+	struct tdm_bd *rx_out_data;	/* Current Channel Rx BD to be
+							read by App */
+	struct tdm_bd tx_data_fifo[TDM_CH_TX_BD_RING_SIZE]; /* Tx Channel Data
+								BD Ring */
+	struct tdm_bd *tx_in_data;	/* Current Channel Tx BD to be
+						 filled by App */
+	struct tdm_bd *tx_out_data;	/* Current Channel Tx BD to be read by
+						interleave function */
+	spinlock_t rx_channel_lock;	/* Spin Lock for Rx Channel */
+	spinlock_t tx_channel_lock;	/* Spin Lock for Tx Channel */
+};
+
+/* structure tdm_port_cfg - contains configuration params for a port */
+struct tdm_port_cfg {
+	unsigned short port_mode;
+};
+
+/* struct tdm_port - represent an TDM ports for a device */
+struct tdm_port {
+	unsigned short port_id;
+	unsigned short in_use;		/* Port is enabled? */
+	uint16_t rx_max_frames;		/* Received Port frames
+					 before allowing Read Operation in
+					 Port Mode */
+
+	struct tdm_port_stats port_stat;/* A structure parameters defining
+					 TDM port statistics. */
+	struct tdm_port_data *p_port_data;	/* a structure parameters
+						defining tdm channelised data */
+
+	struct tdm_driver *driver;	/* driver for this port */
+	struct tdm_adapter *adapter;	/* adapter for this port */
+	struct list_head list;		/* list of ports */
+	struct list_head mychannels;	/* list of channels, created on this
+					 port*/
+	spinlock_t ch_list_lock;	/* Spin Lock for channel_list */
+	struct tdm_port_cfg port_cfg;/* A structure parameters defining
+					 TDM port configuration. */
+};
+
+/* tdm RX-TX Channelised Data */
+struct tdm_ch_data {
+	struct tdm_bd rx_data_fifo[TDM_CH_RX_BD_RING_SIZE]; /* Rx Port Data BD
+								Ring */
+	struct tdm_bd *rx_in_data;	/* Current Port Rx BD to be filled by
+						de-interleave function */
+	struct tdm_bd *rx_out_data; /* Current Port Rx BD to be read by App */
+	struct tdm_bd tx_data_fifo[TDM_CH_TX_BD_RING_SIZE]; /* Tx Port Data BD
+								Ring */
+	struct tdm_bd *tx_in_data;	/* Current Port Tx BD to be filled by
+						App */
+	struct tdm_bd *tx_out_data;	/* Current Port Tx BD to be read by
+						interleave function */
+	spinlock_t rx_channel_lock;	/* Spin Lock for Rx Port */
+	spinlock_t tx_channel_lock;	/* Spin Lock for Tx Port */
+};
+
+/* Channel config params */
+struct tdm_ch_cfg {
+	unsigned short num_slots;
+	unsigned short first_slot;
+};
+
+/* struct tdm_channel- represent a TDM channel for a port */
+struct tdm_channel {
+	u16 ch_id;			/* logical channel number */
+	struct list_head list;		/* list of channels in a port*/
+	struct tdm_port *port;		/* port for this channel */
+	u16 in_use;			/* channel is enabled? */
+	struct tdm_ch_cfg ch_cfg;	/* channel configuration */
+	struct tdm_ch_data *p_ch_data;	/* data storage space for channel */
+	wait_queue_head_t ch_wait_queue;/* waitQueue for RX Channel Data */
+};
+
+/* tdm_adapt_algorithm is for accessing the routines of device */
+struct tdm_adapt_algorithm {
+	u32 (*tdm_read)(struct tdm_adapter *, u16 **);
+	u32 (*tdm_get_write_buf)(struct tdm_adapter *, u16 **);
+	u32 (*tdm_write)(struct tdm_adapter *, void * , unsigned int len);
+	int (*tdm_enable)(struct tdm_adapter *);
+	int (*tdm_disable)(struct tdm_adapter *);
+};
+
+/* tdm_adapter_mode is to define in mode of the device */
+enum tdm_adapter_mode {
+	e_TDM_ADAPTER_MODE_NONE = 0x00,
+	e_TDM_ADAPTER_MODE_T1 = 0x01,
+	e_TDM_ADAPTER_MODE_E1 = 0x02,
+	e_TDM_ADAPTER_MODE_T1_RAW = 0x10,
+	e_TDM_ADAPTER_MODE_E1_RAW = 0x20,
+};
+
+/* tdm_port_mode defines the mode in which the port is configured to operate
+ * It can be channelized/full/fractional.
+ */
+enum tdm_port_mode {
+	e_TDM_PORT_CHANNELIZED = 0	/* Channelized mode */
+	, e_TDM_PORT_FULL = 1		/* Full mode */
+	, e_TDM_PORT_FRACTIONAL = 2	/* Fractional mode */
+};
+
+/* tdm_process_mode used for testing the tdm device in normal mode or internal
+ * loopback or external loopback
+ */
+enum tdm_process_mode {
+	e_TDM_PROCESS_NORMAL = 0	/* Normal mode */
+	, e_TDM_PROCESS_INT_LPB = 1	/* Internal loop mode */
+	, e_TDM_PROCESS_EXT_LPB = 2	/* External Loopback mode */
+};
+
+
+/* TDM configuration parameters */
+struct fsl_tdm_adapt_cfg {
+	u8 num_ch;		/* Number of channels in this adpater */
+	u8 ch_size_type;		/* reciever/transmit channel
+						size for all channels */
+	u8 slot_width;		/* 1 or 2 Is defined by channel type */
+	u8 frame_len;		/* Length of frame in samples */
+	u32 num_frames;
+	u8 loopback;			/* loopback or normal */
+	u8 adap_mode;			/* 0=None, 1= T1, 2= T1-FULL, 3=E1,
+						4 = E1-FULL */
+	int max_num_ports;		/* Not Used: Max Number of ports that
+					can be created on this adapter */
+	int max_timeslots;		/* Max Number of timeslots that are
+					supported on this adapter */
+	int tdm_tx_clk;		/* Value of tdm transmit clk */
+	int tdm_rx_clk;		/* Value of tdm receive clk */
+};
+
+/*
+ * tdm_adapter is the structure used to identify a physical tdm device along
+ * with the access algorithms necessary to access it.
+ */
+struct tdm_adapter {
+	struct module *owner;	/* owner of the adapter module */
+	unsigned int id;	/* Adapter Id */
+	unsigned int class;	/* classes to allow probing for */
+	unsigned int drv_count;	/* Number of drivers associated with the
+				 adapter */
+
+	const struct tdm_adapt_algorithm *algo;	/* the algorithm to access the
+						 adapter*/
+
+	char name[TDM_NAME_SIZE];	/* Name of Adapter */
+	struct mutex adap_lock;
+	struct device *parent;		/*Not Used*/
+
+	struct tasklet_struct tdm_data_tasklet;	/* tasklet handle to perform
+						 data processing*/
+	int tasklet_conf;	/* flag for tasklet configuration */
+	int tdm_rx_flag;
+
+	struct list_head myports;	/* list of ports, created on this
+					 adapter */
+	struct list_head list;
+	spinlock_t portlist_lock;	/* Spin Lock for port_list */
+	void *data;
+	struct fsl_tdm_adapt_cfg adapt_cfg;
+	int num_tdm_phy;		/* Number of tdm phys available */
+	struct tdm_phy *tdm_phy[MAX_TDM_PHY];	/* Stores tdm phys */
+	void *phandle_prop;		/* Pointer to phandle property */
+};
+
+/*
+ * tdm_phy is the structure used to identify a physiscal line control device
+ * and callbacks required to configure it.
+ */
+struct tdm_phy {
+	char name[TDM_PHY_NAME_LEN];
+	struct device_node *np;
+	int (*configure_phy)(struct fsl_tdm_adapt_cfg *);
+	struct tdm_adapter *tdm_adapter; /* Will point to tdm adpater to which
+					    this phy is conected */
+	struct list_head list;
+	void *phandle_prop;		/* Pointer to phandle property */
+};
+
+struct tdm_phy_priv {
+	struct device *device;
+	unsigned int type;	/* Type of tdm_phy: can be SLIC/E1/T1 */
+	struct tdm_phy phy;
+};
+
+
+static inline void *tdm_get_adapdata(const struct tdm_adapter *dev)
+{
+	return dev->data;
+}
+
+static inline void tdm_set_adapdata(struct tdm_adapter *dev, void *data)
+{
+	dev->data = data;
+}
+
+/* functions exported by tdm.o */
+
+extern int tdm_add_adapter(struct tdm_adapter *);
+extern int tdm_del_adapter(struct tdm_adapter *);
+extern int tdm_register_driver(struct tdm_driver *);
+extern void tdm_del_driver(struct tdm_driver *);
+extern void tdm_unregister_driver(struct tdm_driver *);
+extern void init_config_adapter(struct tdm_adapter *);
+
+extern unsigned int tdm_port_open(struct tdm_driver *, void **);
+extern unsigned int tdm_port_close(void *);
+extern unsigned int tdm_port_ioctl(void *, unsigned int, unsigned long);
+extern unsigned int tdm_channel_read(void *, void *, void *, u16 *);
+extern unsigned int tdm_channel_write(void *, void * , void *, u16);
+extern unsigned int tdm_ch_poll(void *, unsigned int);
+
+extern int tdm_channel_open(u16, u16, struct tdm_port *, void **);
+extern int tdm_channel_close(u16, u16, struct tdm_port *,
+						struct tdm_channel *);
+extern int add_tdm_phy(struct tdm_phy *);
+extern int attach_phy_adapter(struct tdm_adapter *,
+				struct tdm_phy *, int phy_id);
+extern int get_tdm_phy(struct tdm_adapter *, void *);
+
+static inline int tdm_add_driver(struct tdm_driver *driver)
+{
+	return tdm_register_driver(driver);
+}
+
+extern struct tdm_adapter *tdm_get_adapter(int id);
+extern void tdm_put_adapter(struct tdm_adapter *adap);
+
+#endif /* __KERNEL__ */
+
+#define TDM_E_OK 0
+
+#endif /* _LINUX_TDM_H */