135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
/*
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* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/dmaengine.h>
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#include <crypto/scatterwalk.h>
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#include "dma.h"
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int qce_dma_request(struct device *dev, struct qce_dma_data *dma)
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{
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int ret;
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dma->txchan = dma_request_slave_channel_reason(dev, "tx");
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if (IS_ERR(dma->txchan))
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return PTR_ERR(dma->txchan);
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dma->rxchan = dma_request_slave_channel_reason(dev, "rx");
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if (IS_ERR(dma->rxchan)) {
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ret = PTR_ERR(dma->rxchan);
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goto error_rx;
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}
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dma->result_buf = kmalloc(QCE_RESULT_BUF_SZ + QCE_IGNORE_BUF_SZ,
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GFP_KERNEL);
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if (!dma->result_buf) {
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ret = -ENOMEM;
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goto error_nomem;
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}
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dma->ignore_buf = dma->result_buf + QCE_RESULT_BUF_SZ;
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return 0;
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error_nomem:
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dma_release_channel(dma->rxchan);
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error_rx:
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dma_release_channel(dma->txchan);
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return ret;
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}
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void qce_dma_release(struct qce_dma_data *dma)
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{
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dma_release_channel(dma->txchan);
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dma_release_channel(dma->rxchan);
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kfree(dma->result_buf);
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}
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struct scatterlist *
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qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl)
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{
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struct scatterlist *sg = sgt->sgl, *sg_last = NULL;
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while (sg) {
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if (!sg_page(sg))
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break;
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sg = sg_next(sg);
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}
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if (!sg)
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return ERR_PTR(-EINVAL);
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while (new_sgl && sg) {
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sg_set_page(sg, sg_page(new_sgl), new_sgl->length,
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new_sgl->offset);
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sg_last = sg;
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sg = sg_next(sg);
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new_sgl = sg_next(new_sgl);
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}
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return sg_last;
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}
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static int qce_dma_prep_sg(struct dma_chan *chan, struct scatterlist *sg,
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int nents, unsigned long flags,
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enum dma_transfer_direction dir,
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dma_async_tx_callback cb, void *cb_param)
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{
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struct dma_async_tx_descriptor *desc;
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dma_cookie_t cookie;
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if (!sg || !nents)
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return -EINVAL;
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desc = dmaengine_prep_slave_sg(chan, sg, nents, dir, flags);
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if (!desc)
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return -EINVAL;
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desc->callback = cb;
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desc->callback_param = cb_param;
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cookie = dmaengine_submit(desc);
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return dma_submit_error(cookie);
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}
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int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *rx_sg,
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int rx_nents, struct scatterlist *tx_sg, int tx_nents,
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dma_async_tx_callback cb, void *cb_param)
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{
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struct dma_chan *rxchan = dma->rxchan;
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struct dma_chan *txchan = dma->txchan;
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unsigned long flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
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int ret;
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ret = qce_dma_prep_sg(rxchan, rx_sg, rx_nents, flags, DMA_MEM_TO_DEV,
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NULL, NULL);
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if (ret)
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return ret;
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return qce_dma_prep_sg(txchan, tx_sg, tx_nents, flags, DMA_DEV_TO_MEM,
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cb, cb_param);
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}
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void qce_dma_issue_pending(struct qce_dma_data *dma)
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{
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dma_async_issue_pending(dma->rxchan);
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dma_async_issue_pending(dma->txchan);
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}
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int qce_dma_terminate_all(struct qce_dma_data *dma)
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{
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int ret;
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ret = dmaengine_terminate_all(dma->rxchan);
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return ret ?: dmaengine_terminate_all(dma->txchan);
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}
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