mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-28 14:44:10 +08:00
fea4045153
The qce driver use two dma_map_sg path according to SG are chained or not. Since dma_map_sg can handle both case, clean the code with all references to sg chained. Thus removing qce_mapsg, qce_unmapsg and qce_countsg functions. Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
/*
|
|
* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 and
|
|
* only version 2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/dmaengine.h>
|
|
#include <crypto/scatterwalk.h>
|
|
|
|
#include "dma.h"
|
|
|
|
int qce_dma_request(struct device *dev, struct qce_dma_data *dma)
|
|
{
|
|
int ret;
|
|
|
|
dma->txchan = dma_request_slave_channel_reason(dev, "tx");
|
|
if (IS_ERR(dma->txchan))
|
|
return PTR_ERR(dma->txchan);
|
|
|
|
dma->rxchan = dma_request_slave_channel_reason(dev, "rx");
|
|
if (IS_ERR(dma->rxchan)) {
|
|
ret = PTR_ERR(dma->rxchan);
|
|
goto error_rx;
|
|
}
|
|
|
|
dma->result_buf = kmalloc(QCE_RESULT_BUF_SZ + QCE_IGNORE_BUF_SZ,
|
|
GFP_KERNEL);
|
|
if (!dma->result_buf) {
|
|
ret = -ENOMEM;
|
|
goto error_nomem;
|
|
}
|
|
|
|
dma->ignore_buf = dma->result_buf + QCE_RESULT_BUF_SZ;
|
|
|
|
return 0;
|
|
error_nomem:
|
|
dma_release_channel(dma->rxchan);
|
|
error_rx:
|
|
dma_release_channel(dma->txchan);
|
|
return ret;
|
|
}
|
|
|
|
void qce_dma_release(struct qce_dma_data *dma)
|
|
{
|
|
dma_release_channel(dma->txchan);
|
|
dma_release_channel(dma->rxchan);
|
|
kfree(dma->result_buf);
|
|
}
|
|
|
|
struct scatterlist *
|
|
qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl)
|
|
{
|
|
struct scatterlist *sg = sgt->sgl, *sg_last = NULL;
|
|
|
|
while (sg) {
|
|
if (!sg_page(sg))
|
|
break;
|
|
sg = sg_next(sg);
|
|
}
|
|
|
|
if (!sg)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
while (new_sgl && sg) {
|
|
sg_set_page(sg, sg_page(new_sgl), new_sgl->length,
|
|
new_sgl->offset);
|
|
sg_last = sg;
|
|
sg = sg_next(sg);
|
|
new_sgl = sg_next(new_sgl);
|
|
}
|
|
|
|
return sg_last;
|
|
}
|
|
|
|
static int qce_dma_prep_sg(struct dma_chan *chan, struct scatterlist *sg,
|
|
int nents, unsigned long flags,
|
|
enum dma_transfer_direction dir,
|
|
dma_async_tx_callback cb, void *cb_param)
|
|
{
|
|
struct dma_async_tx_descriptor *desc;
|
|
dma_cookie_t cookie;
|
|
|
|
if (!sg || !nents)
|
|
return -EINVAL;
|
|
|
|
desc = dmaengine_prep_slave_sg(chan, sg, nents, dir, flags);
|
|
if (!desc)
|
|
return -EINVAL;
|
|
|
|
desc->callback = cb;
|
|
desc->callback_param = cb_param;
|
|
cookie = dmaengine_submit(desc);
|
|
|
|
return dma_submit_error(cookie);
|
|
}
|
|
|
|
int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *rx_sg,
|
|
int rx_nents, struct scatterlist *tx_sg, int tx_nents,
|
|
dma_async_tx_callback cb, void *cb_param)
|
|
{
|
|
struct dma_chan *rxchan = dma->rxchan;
|
|
struct dma_chan *txchan = dma->txchan;
|
|
unsigned long flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
|
|
int ret;
|
|
|
|
ret = qce_dma_prep_sg(rxchan, rx_sg, rx_nents, flags, DMA_MEM_TO_DEV,
|
|
NULL, NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return qce_dma_prep_sg(txchan, tx_sg, tx_nents, flags, DMA_DEV_TO_MEM,
|
|
cb, cb_param);
|
|
}
|
|
|
|
void qce_dma_issue_pending(struct qce_dma_data *dma)
|
|
{
|
|
dma_async_issue_pending(dma->rxchan);
|
|
dma_async_issue_pending(dma->txchan);
|
|
}
|
|
|
|
int qce_dma_terminate_all(struct qce_dma_data *dma)
|
|
{
|
|
int ret;
|
|
|
|
ret = dmaengine_terminate_all(dma->rxchan);
|
|
return ret ?: dmaengine_terminate_all(dma->txchan);
|
|
}
|