Diff: TARGET_SAMD21G18A/TOOLCHAIN_GCC_ARM/dma.h

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Parent:

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+/**
+ * \file
+ *
+ * \brief SAM Direct Memory Access Controller Driver
+ *
+ * Copyright (C) 2014-2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ *    Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+/*
+ * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
+ */
+#ifndef DMA_H_INCLUDED
+#define DMA_H_INCLUDED
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \defgroup asfdoc_sam0_dma_group SAM Direct Memory Access Controller Driver (DMAC)
+ *
+ * This driver for Atmel&reg; | SMART SAM devices provides an interface for the configuration
+ * and management of the Direct Memory Access Controller(DMAC) module within
+ * the device. The DMAC can transfer data between memories and peripherals, and
+ * thus off-load these tasks from the CPU. The module supports peripheral to
+ * peripheral, peripheral to memory, memory to peripheral, and memory to memory
+ * transfers.
+ *
+ * The following peripherals are used by the DMAC Driver:
+ * - DMAC (Direct Memory Access Controller)
+ *
+ * The following devices can use this module:
+ *  - Atmel | SMART SAM D21
+ *  - Atmel | SMART SAM R21
+ *  - Atmel | SMART SAM D10/D11
+ *  - Atmel | SMART SAM L21
+ *  - Atmel | SMART SAM DAx
+ *  - Atmel | SMART SAM C20/C21
+ *
+ * The outline of this documentation is as follows:
+ * - \ref asfdoc_sam0_dma_prerequisites
+ * - \ref asfdoc_sam0_dma_module_overview
+ * - \ref asfdoc_sam0_dma_special_considerations
+ * - \ref asfdoc_sam0_dma_extra_info
+ * - \ref asfdoc_sam0_dma_examples
+ * - \ref asfdoc_sam0_dma_api_overview
+ *
+ *
+ * \section asfdoc_sam0_dma_prerequisites Prerequisites
+ *
+ * There are no prerequisites for this module.
+ *
+ *
+ * \section asfdoc_sam0_dma_module_overview Module Overview
+ *
+ * SAM devices with DMAC enables high data transfer rates with minimum
+ * CPU intervention and frees up CPU time. With access to all peripherals,
+ * the DMAC can handle automatic transfer of data to/from modules.
+ * It supports static and incremental addressing for both source and
+ * destination.
+ *
+ * The DMAC when used with Event System or peripheral triggers, provides a
+ * considerable advantage by reducing the power consumption and performing
+ * data transfer in the background.
+ * For example if the ADC is configured to generate an event, it can trigger
+ * the DMAC to transfer the data into another peripheral or into SRAM.
+ * The CPU can remain in sleep during this time to reduce power consumption.
+ *
+ * <table>
+ *    <tr>
+ *      <th>Device</th>
+ *      <th>Dma channel number</th>
+ *    </tr>
+ *    <tr>
+ *      <td>SAMD21/R21/C20/C21</td>
+ *      <td>12</td>
+ *    </tr>
+ *    <tr>
+ *      <td>SAMD10/D11</td>
+ *      <td>6</td>
+ *    </tr>
+ *    <tr>
+ *      <td>SAML21</td>
+ *      <td>16</td>
+ *    </tr>
+ * </table>
+ * The DMA channel operation can be suspended at any time by software, by events
+ * from event system, or after selectable descriptor execution. The operation
+ * can be resumed by software or by events from event system.
+ * The DMAC driver for SAM supports four types of transfers such as
+ * peripheral to peripheral, peripheral to memory, memory to peripheral, and
+ * memory to memory.
+ *
+ * The basic transfer unit is a beat which is defined as a single bus access.
+ * There can be multiple beats in a single block transfer and multiple block
+ * transfers in a DMA transaction.
+ * DMA transfer is based on descriptors, which holds transfer properties
+ * such as the source and destination addresses, transfer counter, and other
+ * additional transfer control information.
+ * The descriptors can be static or linked. When static, a single block transfer
+ * is performed. When linked, a number of transfer descriptors can be used to
+ * enable multiple block transfers within a single DMA transaction.
+ *
+ * The implementation of the DMA driver is based on the idea that DMA channel
+ * is a finite resource of entities with the same abilities. A DMA channel resource
+ * is able to move a defined set of data from a source address to destination
+ * address triggered by a transfer trigger. On the SAM devices there are 12
+ * DMA resources available for allocation. Each of these DMA resources can trigger
+ * interrupt callback routines and peripheral events.
+ * The other main features are
+ *
+ * - Selectable transfer trigger source
+ *  - Software
+ *  - Event System
+ *  - Peripheral
+ * - Event input and output is supported for the four lower channels
+ * - Four level channel priority
+ * - Optional interrupt generation on transfer complete, channel error or channel suspend
+ * - Supports multi-buffer or circular buffer mode by linking multiple descriptors
+ * - Beat size configurable as 8-bit, 16-bit, or 32-bit
+ *
+ * A simplified block diagram of the DMA Resource can be seen in
+ * \ref asfdoc_sam0_dma_module_block_diagram "the figure below".
+ *
+ * \anchor asfdoc_sam0_dma_module_block_diagram
+ * \dot
+ * digraph overview {
+ * splines = false;
+ * rankdir=LR;
+ *
+ * mux1 [label="Transfer Trigger", shape=box];
+ *
+ * dma [label="DMA Channel", shape=polygon, sides=6, orientation=60, style=filled, fillcolor=darkolivegreen1, height=1, width=1];
+ * descriptor [label="Transfer Descriptor", shape=box, style=filled, fillcolor=lightblue];
+ *
+ * mux1 -> dma;
+ * descriptor -> dma;
+ *
+ * interrupt [label="Interrupt", shape=box];
+ * events [label="Events", shape=box];
+ *
+ * dma:e -> interrupt:w;
+ * dma:e -> events:w;
+ *
+ * {rank=same; descriptor dma}
+ *
+ * }
+ * \enddot
+ *
+ * \subsection asfdoc_sam0_dma_features Driver Feature Macro Definition
+ * <table>
+ *  <tr>
+ *    <th>Driver Feature Macro</th>
+ *    <th>Supported devices</th>
+ *  </tr>
+ *  <tr>
+ *    <td>FEATURE_DMA_CHANNEL_STANDBY</td>
+ *    <td>SAML21/C20/C21</td>
+ *  </tr>
+ * </table>
+ * \note The specific features are only available in the driver when the
+ * selected device supports those features.
+ *
+ * \subsection asfdoc_sam0_dma_module_overview_dma_transf_term Terminology Used in DMAC Transfers
+ *
+ *   <table border="0" cellborder="1" cellspacing="0" >
+ *    <tr>
+ *        <th> Name </th> <th> Description </th>
+ *    </tr>
+ *    <tr>
+ *     <td > Beat </td>
+ *     <td > It is a single bus access by the DMAC.
+ *           Configurable as 8-bit, 16-bit, or 32-bit
+ *     </td>
+ *    </tr>
+ *    <tr>
+ *     <td > Burst </td>
+ *     <td> It is a transfer of n-beats (n=1,4,8,16).
+ *          For the DMAC module in SAM, the burst size is one beat.
+ *          Arbitration takes place each time a burst transfer is completed
+ *     </td>
+ *    </tr>
+ *    <tr>
+ *     <td > Block transfer </td>
+ *     <td>  A single block transfer is a configurable number of (1 to 64k)
+ *           beat transfers
+ *     </td>
+ *    </tr>
+ *   </table>
+ *
+ * \subsection asfdoc_sam0_dma_module_overview_dma_channels DMA Channels
+ * The DMAC in each device consists of several DMA channels, which
+ * along with the transfer descriptors defines the data transfer properties.
+ * - The transfer control descriptor defines the source and destination
+ * addresses, source and destination address increment settings, the
+ * block transfer count and event output condition selection
+ * - Dedicated channel registers control the peripheral trigger source,
+ * trigger mode settings, event input actions, and channel priority level
+ * settings
+ *
+ * With a successful DMA resource allocation, a dedicated
+ * DMA channel will be assigned. The channel will be occupied until the
+ * DMA resource is freed. A DMA resource handle is used to identify the specific
+ * DMA resource.
+ * When there are multiple channels with active requests, the arbiter prioritizes
+ * the channels requesting access to the bus.
+ *
+ * \subsection asfdoc_sam0_dma_module_overview_dma_trigger DMA Triggers
+ * DMA transfer can be started only when a DMA transfer request is acknowledged/granted by the arbiter. A
+ * transfer request can be triggered from software, peripheral, or an event. There
+ * are dedicated source trigger selections for each DMA channel usage.
+
+ *
+ * \subsection asfdoc_sam0_dma_module_overview_dma_transfer_descriptor DMA Transfer Descriptor
+ * The transfer descriptor resides in the SRAM and
+ * defines these channel properties.
+ *   <table border="0" cellborder="1" cellspacing="0" >
+ *    <tr>
+ *        <th> Field name </th> <th> Field width </th>
+ *    </tr>
+ *    <tr>
+ *     <td > Descriptor Next Address </td> <td > 32 bits </td>
+ *    </tr>
+ *    <tr>
+ *     <td > Destination Address </td> <td> 32 bits </td>
+ *    </tr>
+ *    <tr>
+ *     <td > Source Address </td> <td> 32 bits </td>
+ *    </tr>
+ *    <tr>
+ *     <td > Block Transfer Counter </td> <td> 16 bits </td>
+ *    </tr>
+ *    <tr>
+ *     <td > Block Transfer Control </td> <td> 16 bits </td>
+ *    </tr>
+ *   </table>
+ *
+ * Before starting a transfer, at least one descriptor should be configured.
+ * After a successful allocation of a DMA channel, the transfer descriptor can
+ * be added with a call to \ref dma_add_descriptor(). If there is a transfer
+ * descriptor already allocated to the DMA resource, the descriptor will
+ * be linked to the next descriptor address.
+ *
+ * \subsection asfdoc_sam0_dma_module_overview_dma_output DMA Interrupts/Events
+ * Both an interrupt callback and an peripheral event can be triggered by the
+ * DMA transfer. Three types of callbacks are supported by the DMA driver:
+ * transfer complete, channel suspend, and transfer error. Each of these callback
+ * types can be registered and enabled for each channel independently through
+ * the DMA driver API.
+ *
+ * The DMAC module can also generate events on transfer complete. Event
+ * generation is enabled through the DMA channel, event channel configuration,
+ * and event user multiplexing is done through the events driver.
+ *
+ * The DMAC can generate events in the below cases:
+ *
+ * - When a block transfer is complete
+ *
+ * - When each beat transfer within a block transfer is complete
+ *
+ * \section asfdoc_sam0_dma_special_considerations Special Considerations
+ *
+ * There are no special considerations for this module.
+ *
+ *
+ * \section asfdoc_sam0_dma_extra_info Extra Information
+ *
+ * For extra information, see \ref asfdoc_sam0_dma_extra. This includes:
+ * - \ref asfdoc_sam0_dma_extra_acronyms
+ * - \ref asfdoc_sam0_dma_extra_dependencies
+ * - \ref asfdoc_sam0_dma_extra_errata
+ * - \ref asfdoc_sam0_dma_extra_history
+ *
+ *
+ * \section asfdoc_sam0_dma_examples Examples
+ *
+ * For a list of examples related to this driver, see
+ * \ref asfdoc_sam0_dma_exqsg.
+ *
+ *
+ * \section asfdoc_sam0_dma_api_overview API Overview
+ * @{
+ */
+
+#include <compiler.h>
+#include "conf_dma.h"
+
+#if (SAML21) || (SAMC20) || (SAMC21) || defined(__DOXYGEN__)
+#define FEATURE_DMA_CHANNEL_STANDBY
+#endif
+
+/** DMA invalid channel number. */
+#define DMA_INVALID_CHANNEL        0xff
+
+/** ExInitial description section. */
+extern DmacDescriptor descriptor_section[CONF_MAX_USED_CHANNEL_NUM];
+
+/* DMA channel interrup flag. */
+extern uint8_t g_chan_interrupt_flag[CONF_MAX_USED_CHANNEL_NUM];
+
+/** DMA priority level. */
+enum dma_priority_level {
+    /** Priority level 0. */
+    DMA_PRIORITY_LEVEL_0,
+    /** Priority level 1. */
+    DMA_PRIORITY_LEVEL_1,
+    /** Priority level 2. */
+    DMA_PRIORITY_LEVEL_2,
+    /** Priority level 3. */
+    DMA_PRIORITY_LEVEL_3,
+};
+
+/** DMA input actions. */
+enum dma_event_input_action {
+    /** No action. */
+    DMA_EVENT_INPUT_NOACT,
+    /** Normal transfer and periodic transfer trigger. */
+    DMA_EVENT_INPUT_TRIG,
+    /** Conditional transfer trigger. */
+    DMA_EVENT_INPUT_CTRIG,
+    /** Conditional block transfer. */
+    DMA_EVENT_INPUT_CBLOCK,
+    /** Channel suspend operation. */
+    DMA_EVENT_INPUT_SUSPEND,
+    /** Channel resume operation. */
+    DMA_EVENT_INPUT_RESUME,
+    /** Skip next block suspend action. */
+    DMA_EVENT_INPUT_SSKIP,
+};
+
+/**
+ * Address increment step size. These bits select the address increment step
+ * size. The setting apply to source or destination address, depending on
+ * STEPSEL setting.
+ */
+enum dma_address_increment_stepsize {
+    /** The address is incremented by (beat size * 1). */
+    DMA_ADDRESS_INCREMENT_STEP_SIZE_1 = 0,
+    /** The address is incremented by (beat size * 2). */
+    DMA_ADDRESS_INCREMENT_STEP_SIZE_2,
+    /** The address is incremented by (beat size * 4). */
+    DMA_ADDRESS_INCREMENT_STEP_SIZE_4,
+    /** The address is incremented by (beat size * 8). */
+    DMA_ADDRESS_INCREMENT_STEP_SIZE_8,
+    /** The address is incremented by (beat size * 16). */
+    DMA_ADDRESS_INCREMENT_STEP_SIZE_16,
+    /** The address is incremented by (beat size * 32). */
+    DMA_ADDRESS_INCREMENT_STEP_SIZE_32,
+    /** The address is incremented by (beat size * 64). */
+    DMA_ADDRESS_INCREMENT_STEP_SIZE_64,
+    /** The address is incremented by (beat size * 128). */
+    DMA_ADDRESS_INCREMENT_STEP_SIZE_128,
+};
+
+/**
+ * DMA step selection. This bit determines whether the step size setting
+ * is applied to source or destination address.
+ */
+enum dma_step_selection {
+    /** Step size settings apply to the destination address. */
+    DMA_STEPSEL_DST = 0,
+    /** Step size settings apply to the source address. */
+    DMA_STEPSEL_SRC,
+};
+
+/** The basic transfer unit in DMAC is a beat, which is defined as a
+ *  single bus access. Its size is configurable and applies to both read
+ *  and write. */
+enum dma_beat_size {
+    /** 8-bit access. */
+    DMA_BEAT_SIZE_BYTE = 0,
+    /** 16-bit access. */
+    DMA_BEAT_SIZE_HWORD,
+    /** 32-bit access. */
+    DMA_BEAT_SIZE_WORD,
+};
+
+/**
+ * Block action definitions.
+ */
+enum dma_block_action {
+    /** No action. */
+    DMA_BLOCK_ACTION_NOACT = 0,
+    /** Channel in normal operation and sets transfer complete interrupt flag
+     *  after block transfer. */
+    DMA_BLOCK_ACTION_INT,
+    /** Trigger channel suspend after block transfer and sets channel
+     *  suspend interrupt flag once the channel is suspended. */
+    DMA_BLOCK_ACTION_SUSPEND,
+    /** Sets transfer complete interrupt flag after a block transfer and
+     *  trigger channel suspend. The channel suspend interrupt flag will be set
+     *  once the channel is suspended. */
+    DMA_BLOCK_ACTION_BOTH,
+};
+
+/** Event output selection. */
+enum dma_event_output_selection {
+    /** Event generation disable. */
+    DMA_EVENT_OUTPUT_DISABLE = 0,
+    /** Event strobe when block transfer complete. */
+    DMA_EVENT_OUTPUT_BLOCK,
+    /** Event output reserved. */
+    DMA_EVENT_OUTPUT_RESERVED,
+    /** Event strobe when beat transfer complete. */
+    DMA_EVENT_OUTPUT_BEAT,
+};
+
+/** DMA trigger action type. */
+enum dma_transfer_trigger_action {
+    /** Perform a block transfer when triggered. */
+    DMA_TRIGGER_ACTON_BLOCK = DMAC_CHCTRLB_TRIGACT_BLOCK_Val,
+    /** Perform a beat transfer when triggered. */
+    DMA_TRIGGER_ACTON_BEAT = DMAC_CHCTRLB_TRIGACT_BEAT_Val,
+    /** Perform a transaction when triggered. */
+    DMA_TRIGGER_ACTON_TRANSACTION = DMAC_CHCTRLB_TRIGACT_TRANSACTION_Val,
+};
+
+/**
+ * Callback types for DMA callback driver.
+ */
+enum dma_callback_type {
+    /** Callback for any of transfer errors. A transfer error is flagged
+     *	if a bus error is detected during an AHB access or when the DMAC
+     *  fetches an invalid descriptor. */
+    DMA_CALLBACK_TRANSFER_ERROR,
+    /** Callback for transfer complete. */
+    DMA_CALLBACK_TRANSFER_DONE,
+    /** Callback for channel suspend. */
+    DMA_CALLBACK_CHANNEL_SUSPEND,
+    /** Number of available callbacks. */
+    DMA_CALLBACK_N,
+};
+
+/**
+ * DMA transfer descriptor configuration. When the source or destination address
+ * increment is enabled, the addresses stored into the configuration structure
+ * must correspond to the end of the transfer.
+ *
+ */
+struct dma_descriptor_config {
+    /** Descriptor valid flag used to identify whether a descriptor is
+        valid or not. */
+    bool descriptor_valid;
+    /** This is used to generate an event on specific transfer action in
+        a channel. Supported only in four lower channels. */
+    enum dma_event_output_selection event_output_selection;
+    /** Action taken when a block transfer is completed. */
+    enum dma_block_action block_action;
+    /** Beat size is configurable as 8-bit, 16-bit, or 32-bit. */
+    enum dma_beat_size beat_size;
+    /** Used for enabling the source address increment. */
+    bool src_increment_enable;
+    /** Used for enabling the destination address increment. */
+    bool dst_increment_enable;
+    /** This bit selects whether the source or destination address is
+        using the step size settings. */
+    enum dma_step_selection step_selection;
+    /** The step size for source/destination address increment.
+        The next address is calculated
+        as next_addr = addr + (2^step_size * beat size). */
+    enum dma_address_increment_stepsize step_size;
+    /** It is the number of beats in a block. This count value is
+     * decremented by one after each beat data transfer. */
+    uint16_t block_transfer_count;
+    /** Transfer source address. */
+    uint32_t source_address;
+    /** Transfer destination address. */
+    uint32_t destination_address;
+    /** Set to zero for static descriptors. This must have a valid memory
+        address for linked descriptors. */
+    uint32_t next_descriptor_address;
+};
+
+/** Configurations for DMA events. */
+struct dma_events_config {
+    /** Event input actions. */
+    enum dma_event_input_action input_action;
+    /** Enable DMA event output. */
+    bool event_output_enable;
+};
+
+/** DMA configurations for transfer. */
+struct dma_resource_config {
+    /** DMA transfer priority. */
+    enum dma_priority_level priority;
+    /**DMA peripheral trigger index. */
+    uint8_t peripheral_trigger;
+    /** DMA trigger action. */
+    enum dma_transfer_trigger_action trigger_action;
+#ifdef FEATURE_DMA_CHANNEL_STANDBY
+    /** Keep DMA channel enabled in standby sleep mode if true. */
+    bool run_in_standby;
+#endif
+    /** DMA events configurations. */
+    struct dma_events_config event_config;
+};
+
+/** Forward definition of the DMA resource. */
+struct dma_resource;
+/** Type definition for a DMA resource callback function. */
+typedef void (*dma_callback_t)(struct dma_resource *const resource);
+
+/** Structure for DMA transfer resource. */
+struct dma_resource {
+    /** Allocated DMA channel ID. */
+    uint8_t channel_id;
+    /** Array of callback functions for DMA transfer job. */
+    dma_callback_t callback[DMA_CALLBACK_N];
+    /** Bit mask for enabled callbacks. */
+    uint8_t callback_enable;
+    /** Status of the last job. */
+    volatile enum status_code job_status;
+    /** Transferred data size. */
+    uint32_t transfered_size;
+    /** DMA transfer descriptor. */
+    DmacDescriptor* descriptor;
+};
+
+/**
+ * \brief Get DMA resource status.
+ *
+ * \param[in] resource Pointer to the DMA resource
+ *
+ * \return Status of the DMA resource.
+ */
+static inline enum status_code dma_get_job_status(struct dma_resource *resource)
+{
+    Assert(resource);
+
+    return resource->job_status;
+}
+
+/**
+ * \brief Check if the given DMA resource is busy.
+ *
+ * \param[in] resource Pointer to the DMA resource
+ *
+ * \return Status which indicates whether the DMA resource is busy.
+ *
+ * \retval true The DMA resource has an on-going transfer
+ * \retval false The DMA resource is not busy
+ */
+static inline bool dma_is_busy(struct dma_resource *resource)
+{
+    Assert(resource);
+
+    return (resource->job_status == STATUS_BUSY);
+}
+
+/**
+ * \brief Enable a callback function for a dedicated DMA resource.
+ *
+ * \param[in] resource Pointer to the DMA resource
+ * \param[in] type Callback function type
+ *
+ */
+static inline void dma_enable_callback(struct dma_resource *resource,
+                                       enum dma_callback_type type)
+{
+    Assert(resource);
+
+    resource->callback_enable |= 1 << type;
+    g_chan_interrupt_flag[resource->channel_id] |= (1UL << type);
+}
+
+/**
+ * \brief Disable a callback function for a dedicated DMA resource.
+ *
+ * \param[in] resource Pointer to the DMA resource
+ * \param[in] type Callback function type
+ *
+ */
+static inline void dma_disable_callback(struct dma_resource *resource,
+                                        enum dma_callback_type type)
+{
+    Assert(resource);
+
+    resource->callback_enable &= ~(1 << type);
+    g_chan_interrupt_flag[resource->channel_id] &= (~(1UL << type) & DMAC_CHINTENSET_MASK);
+    DMAC->CHINTENCLR.reg = (1UL << type);
+}
+
+/**
+ * \brief Register a callback function for a dedicated DMA resource.
+ *
+ * There are three types of callback functions, which can be registered:
+ * - Callback for transfer complete
+ * - Callback for transfer error
+ * - Callback for channel suspend
+ *
+ * \param[in] resource Pointer to the DMA resource
+ * \param[in] callback Pointer to the callback function
+ * \param[in] type Callback function type
+ *
+ */
+static inline void dma_register_callback(struct dma_resource *resource,
+        dma_callback_t callback, enum dma_callback_type type)
+{
+    Assert(resource);
+
+    resource->callback[type] = callback;
+}
+
+/**
+ * \brief Unregister a callback function for a dedicated DMA resource.
+ *
+ * There are three types of callback functions:
+ * - Callback for transfer complete
+ * - Callback for transfer error
+ * - Callback for channel suspend
+ *
+ * The application can unregister any of the callback functions which
+ * are already registered and are no longer needed.
+ *
+ * \param[in] resource Pointer to the DMA resource
+ * \param[in] type Callback function type
+ *
+ */
+static inline void dma_unregister_callback(struct dma_resource *resource,
+        enum dma_callback_type type)
+{
+    Assert(resource);
+
+    resource->callback[type] = NULL;
+}
+
+/**
+ * \brief Will set a software trigger for resource.
+ *
+ * This function is used to set a software trigger on the DMA channel
+ * associated with resource. If a trigger is already pending no new trigger
+ * will be generated for the channel.
+ *
+ * \param[in] resource Pointer to the DMA resource
+ */
+static inline void dma_trigger_transfer(struct dma_resource *resource)
+{
+    Assert(resource);
+
+    DMAC->SWTRIGCTRL.reg |= (1 << resource->channel_id);
+}
+
+/**
+ * \brief Initializes DMA transfer configuration with predefined default values.
+ *
+ * This function will initialize a given DMA descriptor configuration structure to
+ * a set of known default values. This function should be called on
+ * any new instance of the configuration structure before being
+ * modified by the user application.
+ *
+ * The default configuration is as follows:
+ *  \li Set the descriptor as valid
+ *  \li Disable event output
+ *  \li No block action
+ *  \li Set beat size as byte
+ *  \li Enable source increment
+ *  \li Enable destination increment
+ *  \li Step size is applied to the destination address
+ *  \li Address increment is beat size multiplied by 1
+ *  \li Default transfer size is set to 0
+ *  \li Default source address is set to NULL
+ *  \li Default destination address is set to NULL
+ *  \li Default next descriptor not available
+ * \param[out] config Pointer to the configuration
+ *
+ */
+static inline void dma_descriptor_get_config_defaults(struct dma_descriptor_config *config)
+{
+    Assert(config);
+
+    /* Set descriptor as valid */
+    config->descriptor_valid = true;
+    /* Disable event output */
+    config->event_output_selection = DMA_EVENT_OUTPUT_DISABLE;
+    /* No block action */
+    config->block_action = DMA_BLOCK_ACTION_NOACT;
+    /* Set beat size to one byte */
+    config->beat_size = DMA_BEAT_SIZE_BYTE;
+    /* Enable source increment */
+    config->src_increment_enable = true;
+    /* Enable destination increment */
+    config->dst_increment_enable = true;
+    /* Step size is applied to the destination address */
+    config->step_selection = DMA_STEPSEL_DST;
+    /* Address increment is beat size multiplied by 1*/
+    config->step_size = DMA_ADDRESS_INCREMENT_STEP_SIZE_1;
+    /* Default transfer size is set to 0 */
+    config->block_transfer_count = 0;
+    /* Default source address is set to NULL */
+    config->source_address = (uint32_t)NULL;
+    /* Default destination address is set to NULL */
+    config->destination_address = (uint32_t)NULL;
+    /** Next descriptor address set to 0 */
+    config->next_descriptor_address = 0;
+}
+
+/**
+ * \brief Update DMA descriptor.
+ *
+ * This function can update the descriptor of an allocated DMA resource.
+ *
+ */
+static inline void dma_update_descriptor(struct dma_resource *resource,
+        DmacDescriptor* descriptor)
+{
+    Assert(resource);
+
+    resource->descriptor = descriptor;
+}
+
+/**
+ * \brief Reset DMA descriptor.
+ *
+ * This function will clear the DESCADDR register of an allocated DMA resource.
+ *
+ */
+static inline void dma_reset_descriptor(struct dma_resource *resource)
+{
+    Assert(resource);
+
+    resource->descriptor = NULL;
+}
+
+void dma_get_config_defaults(struct dma_resource_config *config);
+enum status_code dma_allocate(struct dma_resource *resource,
+                              struct dma_resource_config *config);
+enum status_code dma_free(struct dma_resource *resource);
+enum status_code dma_start_transfer_job(struct dma_resource *resource);
+void dma_abort_job(struct dma_resource *resource);
+void dma_suspend_job(struct dma_resource *resource);
+void dma_resume_job(struct dma_resource *resource);
+void dma_descriptor_create(DmacDescriptor* descriptor,
+                           struct dma_descriptor_config *config);
+enum status_code dma_add_descriptor(struct dma_resource *resource,
+                                    DmacDescriptor* descriptor);
+
+/** @} */
+
+/**
+ * \page asfdoc_sam0_dma_extra Extra Information for DMAC Driver
+ *
+ * \section asfdoc_sam0_dma_extra_acronyms Acronyms
+ * Below is a table listing the acronyms used in this module, along with their
+ * intended meanings.
+ *
+ * <table>
+ *   <tr>
+ *     <th>Acronym</th>
+ *     <th>Description</th>
+ *   </tr>
+ *   <tr>
+ *     <td>DMA</td>
+ *     <td>Direct Memory Access</td>
+ *   </tr>
+ *   <tr>
+ *     <td>DMAC</td>
+ *     <td>Direct Memory Access Controller </td>
+ *   </tr>
+ *   <tr>
+ *     <td>CPU</td>
+ *     <td>Central Processing Unit</td>
+ *   </tr>
+ * </table>
+ *
+ *
+ * \section asfdoc_sam0_dma_extra_dependencies Dependencies
+ * This driver has the following dependencies:
+ *
+ * - \ref asfdoc_sam0_system_clock_group "System Clock Driver"
+ *
+ *
+ * \section asfdoc_sam0_dma_extra_errata Errata
+ * There are no errata related to this driver.
+ *
+ *
+ * \section asfdoc_sam0_dma_extra_history Module History
+ * An overview of the module history is presented in the table below, with
+ * details on the enhancements and fixes made to the module since its first
+ * release. The current version of this corresponds to the newest version in
+ * the table.
+ *
+ * <table>
+ *   <tr>
+ *     <th>Changelog</th>
+ *   </tr>
+ *   <tr>
+ *     <td>Add SAM C21 support</td>
+ *   </tr>
+ *   <tr>
+ *     <td>Add SAM L21 support</td>
+ *   </tr>
+ *   <tr>
+ *     <td>Initial Release</td>
+ *   </tr>
+ * </table>
+ */
+
+/**
+* \page asfdoc_sam0_dma_exqsg Examples for DMAC Driver
+*
+* This is a list of the available Quick Start Guides (QSGs) and example
+* applications for \ref asfdoc_sam0_dma_group. QSGs are simple examples with
+* step-by-step instructions to configure and use this driver in a selection of
+* use cases. Note that QSGs can be compiled as a standalone application or be
+* added to the user application.
+*
+* - \subpage asfdoc_sam0_dma_basic_use_case
+*
+* \note More DMA usage examples are available in peripheral QSGs.
+* A quick start guide for TC/TCC
+* shows the usage of DMA event trigger; SERCOM SPI/USART/I<SUP>2</SUP>C has example for
+* DMA transfer from peripheral to memory or from memory to peripheral;
+* ADC/DAC shows peripheral to peripheral transfer.
+*
+* \page asfdoc_sam0_dma_document_revision_history Document Revision History
+*
+* <table>
+*    <tr>
+*        <th>Doc. Rev.</td>
+*        <th>Date</td>
+*        <th>Comments</td>
+*    </tr>
+*    <tr>
+*        <td>C</td>
+*        <td>06/2015</td>
+*        <td>Added SAML21, SAMC21, and SAMDAx support</td>
+*    </tr>
+*    <tr>
+*        <td>B</td>
+*        <td>12/2014</td>
+*        <td>Added SAMR21 and SAMD10/D11 support</td>
+*    </tr>
+*    <tr>
+*        <td>A</td>
+*        <td>02/2014</td>
+*        <td>Initial release</td>
+*    </tr>
+* </table>
+*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* DMA_H_INCLUDED */