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Nuttx/dma: add dma framework for nuttx

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Signed-off-by: ZhongAn <zhongan@pinecone.net>
Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
This commit is contained in:
ZhongAn 2018-03-28 15:30:23 +08:00 committed by Xiang Xiao
parent 64d8249895
commit 596f52c3ee
5 changed files with 315 additions and 0 deletions
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1
drivers/Kconfig
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@ -53,3 +53,4 @@ source "drivers/motor/Kconfig"
source "drivers/math/Kconfig"
source "drivers/segger/Kconfig"
source "drivers/usrsock/Kconfig"
source "drivers/dma/Kconfig"

1
drivers/Makefile
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@ -32,6 +32,7 @@ include bch/Make.defs
include can/Make.defs
include clk/Make.defs
include crypto/Make.defs
include dma/Make.defs
include math/Make.defs
include motor/Make.defs
include i2c/Make.defs

18
drivers/dma/Kconfig Normal file
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@ -0,0 +1,18 @@
#
# For a description of the syntax of this configuration file,
# see the file kconfig-language.txt in the NuttX tools repository.
#
menuconfig DMA
bool "DMA driver interfaces"
default n
select ARCH_DMA
---help---
Drivers for various DMA devices.
if DMA
config DMA_LINK
bool "Support DMA link configure"
endif

29
drivers/dma/Make.defs Normal file
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@ -0,0 +1,29 @@
############################################################################
# drivers/dma/Make.defs
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership. The
# ASF licenses this file to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance with the
# License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
############################################################################
# Include dma driver build support
ifeq ($(CONFIG_DMA),y)
DEPPATH += --dep-path dma
VPATH += :dma
CFLAGS += ${INCDIR_PREFIX}$(TOPDIR)$(DELIM)drivers$(DELIM)dma
endif # CONFIG_DMA

266
include/nuttx/dma/dma.h Normal file
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@ -0,0 +1,266 @@
/****************************************************************************
* include/nuttx/dma/dma.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
#ifndef __INCLUDE_NUTTX_DMA_DMA_H
#define __INCLUDE_NUTTX_DMA_DMA_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <sys/types.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* DMA transfer direction indicator */
#define DMA_MEM_TO_MEM 1
#define DMA_MEM_TO_DEV 2
#define DMA_DEV_TO_MEM 3
#define DMA_DEV_TO_DEV 4
/****************************************************************************
* Name: DMA_GET_CHAN
*
* Description:
* Get a DMA channel. This function gives the caller mutually exclusive
* access to the DMA channel specified by the 'ident' argument.
*
* If the DMA channel is not available, then DMA_GET_CHAN will wait
* until the holder of the channel relinquishes the channel by calling
* DMA_PUT_CHAN(). WARNING: If you have two devices sharing a DMA
* channel and the code never releases the channel, the DMA_GET_CHAN
* call for the other will hang forever in this function!
*
* Input Parameters:
* ident - Identifies the channel resource
*
* Returned Value:
* Provided that 'ident' is valid, this function ALWAYS returns a non-NULL,
* dma_chan_s instance. (If 'ident' is invalid, the function will assert
* if debug is enabled or do something ignorant otherwise).
*
****************************************************************************/
#define DMA_GET_CHAN(dev, ident) (dev)->get_chan(dev, ident)
/****************************************************************************
* Name: DMA_PUT_CHAN
*
* Description:
* Release a DMA channel. If another thread is waiting for this DMA channel
* in a call to DMA_GET_CHAN, then this function will re-assign the DMA
* channel to that thread and wake it up. NOTE: The 'chan' used in this
* argument must NEVER be used again until DMA_GET_CHAN() is called again
* to re-gain access to the channel.
*
* Returned Value:
* None
*
****************************************************************************/
#define DMA_PUT_CHAN(dev, chan) (dev)->put_chan(dev, chan)
/****************************************************************************
* Name: DMA_CONFIG
*
* Description:
* Configure DMA before using
*
****************************************************************************/
#define DMA_CONFIG(chan, cfg) (chan)->ops->config(chan, cfg)
/****************************************************************************
* Name: DMA_START
*
* Description:
* Start the DMA transfer. NOTE: The DMA module does *NOT* perform any
* cache operations. It is the responsibility of the DMA client to clean
* DMA buffers after staring of the DMA TX operations.
*
* Input Parameters:
* chan - The channel to start
* callback - The callback when the transfer finish
* arg - The argument will pass to callback
* dst - The destination address
* src - The source address
* len - The length to transfer
*
* Returned Value:
* The error code
*
****************************************************************************/
#define DMA_START(chan, callback, arg, dst, src, len) \
(chan)->ops->start(chan, callback, arg, dst, src, len)
/****************************************************************************
* Name: DMA_START_CYCLIC
*
* Description:
* Start the cyclic DMA transfer.
*
* Note: callback get called for each period length data DMA transfer.
*
****************************************************************************/
#define DMA_START_CYCLIC(chan, callback, arg, dst, src, len, period_len) \
(chan)->ops->start_cyclic(chan, callback, arg, dst, src, len, period_len)
/****************************************************************************
* Name: DMA_PAUSE
*
* Description:
* Pause the DMA transfer. After DMA_PAUSE() is called, DMA_RESUME() must
* be called to restart the transfer again.
*
****************************************************************************/
#define DMA_PAUSE(chan) (chan)->ops->pause(chan)
/****************************************************************************
* Name: DMA_RESUME
*
* Description:
* Resume the DMA transfer.
*
****************************************************************************/
#define DMA_RESUME(chan) (chan)->ops->resume(chan)
/****************************************************************************
* Name: DMA_STOP
*
* Description:
* Stop the DMA transfer.
*
****************************************************************************/
#define DMA_STOP(chan) (chan)->ops->stop(chan)
/****************************************************************************
* Name: DMA_RESIDUAL
*
* Description:
* Returns the number of bytes remaining to be transferred.
*
****************************************************************************/
#define DMA_RESIDUAL(chan) (chan)->ops->residual(chan)
/****************************************************************************
* Public Types
****************************************************************************/
/****************************************************************************
* This is the type of the callback that is used to inform the user of the
* completion of the DMA. NOTE: The DMA module does *NOT* perform any cache
* operations. It is the responsibility of the DMA client to invalidate DMA
* buffers after completion of the DMA RX operations.
*
* Input Parameters:
* chan - Refers to the DMA channel.
* arg - A user-provided value that was provided when start() was called.
* len - Positive value represent the transfer length, negative is error
* code.
*
* Returned Value:
* None
*
****************************************************************************/
struct dma_chan_s;
typedef CODE void (*dma_callback_t)(FAR struct dma_chan_s *chan,
FAR void *arg, ssize_t len);
/* This struct is passed in as configuration data to a DMA engine
* in order to set up a certain channel for DMA transport at runtime.
*
* The rationale for adding configuration information to this struct is as
* follows: if it is likely that more than one DMA controllers in the world
* will support the configuration option, then make it generic. If not: if
* it is fixed so that it be sent in static from the platform data, then
* prefer to do that.
*
* direction - whether the data shall go in or out on this channel.
* priority - the bus priority compare with other active channel.
* timeout - abort if the source can't prepare data within this value.
* dst_width - this is the width in bytes of destination target(TX) register
* where DMA data shall be read. If the source is memory this
* may be ignored. Legal values: 1, 2, 4, 8.
* src_width - same as dst_width but for the source(RX) mutatis mutandis.
*
* Note: the special value zero means to keep the current value without
* change.
*
****************************************************************************/
struct dma_config_s
{
unsigned int direction;
unsigned int priority;
unsigned int timeout;
unsigned int dst_width;
unsigned int src_width;
};
/* The DMA vtable */
struct dma_ops_s
{
CODE int (*config)(FAR struct dma_chan_s *chan,
FAR const struct dma_config_s *cfg);
CODE int (*start)(FAR struct dma_chan_s *chan,
dma_callback_t callback, FAR void *arg,
uintptr_t dst, uintptr_t src, size_t len);
CODE int (*start_cyclic)(FAR struct dma_chan_s *chan,
dma_callback_t callback, FAR void *arg,
uintptr_t dst, uintptr_t src,
size_t len, size_t period_len);
CODE int (*stop)(FAR struct dma_chan_s *chan);
CODE int (*pause)(FAR struct dma_chan_s *chan);
CODE int (*resume)(FAR struct dma_chan_s *chan);
CODE size_t (*residual)(FAR struct dma_chan_s *chan);
};
/* This structure only defines the initial fields of the structure
* visible to the DMA client. The specific implementation may add
* additional device specific fields after the vtable.
*/
struct dma_chan_s
{
FAR const struct dma_ops_s *ops;
};
struct dma_dev_s
{
CODE FAR struct dma_chan_s *(*get_chan)(FAR struct dma_dev_s *dev,
unsigned int ident);
CODE void (*put_chan)(FAR struct dma_dev_s *dev,
FAR struct dma_chan_s *chan);
};
#endif /* __INCLUDE_NUTTX_DMA_DMA_H */