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dma: add channels support

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This adds channels support for dma controllers that have multiple channels
which can transfer data to/from different devices (enet, usb...).

DMA channle API:
 dma_get_by_index()
 dma_get_by_name()
 dma_request()
 dma_free()
 dma_enable()
 dma_disable()
 dma_prepare_rcv_buf()
 dma_receive()
 dma_send()

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
[grygorii.strashko@ti.com: drop unused dma_get_by_index_platdata(),
 add metadata to send/receive ops, add dma_prepare_rcv_buf(),
 minor clean up]
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Álvaro Fernández Rojas
2018-11-28 19:17:50 +01:00
committed by Tom Rini
parent 10b4dc5208
commit 27ab27f850
4 changed files with 532 additions and 7 deletions
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91
include/dma-uclass.h
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@@ -1,7 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2018 Álvaro Fernández Rojas <noltari@gmail.com>
* Copyright (C) 2015 Texas Instruments Incorporated <www.ti.com>
* Copyright (C) 2015 - 2018 Texas Instruments Incorporated <www.ti.com>
* Written by Mugunthan V N <mugunthanvnm@ti.com>
*
*/
@@ -13,6 +13,8 @@
#include <dma.h>
struct ofnode_phandle_args;
/*
* struct dma_ops - Driver model DMA operations
*
@@ -20,6 +22,93 @@
* driver model.
*/
struct dma_ops {
#ifdef CONFIG_DMA_CHANNELS
/**
* of_xlate - Translate a client's device-tree (OF) DMA specifier.
*
* The DMA core calls this function as the first step in implementing
* a client's dma_get_by_*() call.
*
* If this function pointer is set to NULL, the DMA core will use a
* default implementation, which assumes #dma-cells = <1>, and that
* the DT cell contains a simple integer DMA Channel.
*
* At present, the DMA API solely supports device-tree. If this
* changes, other xxx_xlate() functions may be added to support those
* other mechanisms.
*
* @dma: The dma struct to hold the translation result.
* @args: The dma specifier values from device tree.
* @return 0 if OK, or a negative error code.
*/
int (*of_xlate)(struct dma *dma,
struct ofnode_phandle_args *args);
/**
* request - Request a translated DMA.
*
* The DMA core calls this function as the second step in
* implementing a client's dma_get_by_*() call, following a successful
* xxx_xlate() call, or as the only step in implementing a client's
* dma_request() call.
*
* @dma: The DMA struct to request; this has been filled in by
* a previoux xxx_xlate() function call, or by the caller of
* dma_request().
* @return 0 if OK, or a negative error code.
*/
int (*request)(struct dma *dma);
/**
* free - Free a previously requested dma.
*
* This is the implementation of the client dma_free() API.
*
* @dma: The DMA to free.
* @return 0 if OK, or a negative error code.
*/
int (*free)(struct dma *dma);
/**
* enable() - Enable a DMA Channel.
*
* @dma: The DMA Channel to manipulate.
* @return zero on success, or -ve error code.
*/
int (*enable)(struct dma *dma);
/**
* disable() - Disable a DMA Channel.
*
* @dma: The DMA Channel to manipulate.
* @return zero on success, or -ve error code.
*/
int (*disable)(struct dma *dma);
/**
* prepare_rcv_buf() - Prepare/Add receive DMA buffer.
*
* @dma: The DMA Channel to manipulate.
* @dst: The receive buffer pointer.
* @size: The receive buffer size
* @return zero on success, or -ve error code.
*/
int (*prepare_rcv_buf)(struct dma *dma, void *dst, size_t size);
/**
* receive() - Receive a DMA transfer.
*
* @dma: The DMA Channel to manipulate.
* @dst: The destination pointer.
* @metadata: DMA driver's specific data
* @return zero on success, or -ve error code.
*/
int (*receive)(struct dma *dma, void **dst, void *metadata);
/**
* send() - Send a DMA transfer.
*
* @dma: The DMA Channel to manipulate.
* @src: The source pointer.
* @len: Length of the data to be sent (number of bytes).
* @metadata: DMA driver's specific data
* @return zero on success, or -ve error code.
*/
int (*send)(struct dma *dma, void *src, size_t len, void *metadata);
#endif /* CONFIG_DMA_CHANNELS */
/**
* transfer() - Issue a DMA transfer. The implementation must
* wait until the transfer is done.