1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
6 #include <linux/dmaengine.h>
7 #include <crypto/scatterwalk.h>
11 int qce_dma_request(struct device *dev, struct qce_dma_data *dma)
15 dma->txchan = dma_request_chan(dev, "tx");
16 if (IS_ERR(dma->txchan))
17 return PTR_ERR(dma->txchan);
19 dma->rxchan = dma_request_chan(dev, "rx");
20 if (IS_ERR(dma->rxchan)) {
21 ret = PTR_ERR(dma->rxchan);
25 dma->result_buf = kmalloc(QCE_RESULT_BUF_SZ + QCE_IGNORE_BUF_SZ,
27 if (!dma->result_buf) {
32 dma->ignore_buf = dma->result_buf + QCE_RESULT_BUF_SZ;
36 dma_release_channel(dma->rxchan);
38 dma_release_channel(dma->txchan);
42 void qce_dma_release(struct qce_dma_data *dma)
44 dma_release_channel(dma->txchan);
45 dma_release_channel(dma->rxchan);
46 kfree(dma->result_buf);
50 qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl,
53 struct scatterlist *sg = sgt->sgl, *sg_last = NULL;
63 return ERR_PTR(-EINVAL);
65 while (new_sgl && sg && max_len) {
66 new_len = new_sgl->length > max_len ? max_len : new_sgl->length;
67 sg_set_page(sg, sg_page(new_sgl), new_len, new_sgl->offset);
70 new_sgl = sg_next(new_sgl);
77 static int qce_dma_prep_sg(struct dma_chan *chan, struct scatterlist *sg,
78 int nents, unsigned long flags,
79 enum dma_transfer_direction dir,
80 dma_async_tx_callback cb, void *cb_param)
82 struct dma_async_tx_descriptor *desc;
88 desc = dmaengine_prep_slave_sg(chan, sg, nents, dir, flags);
93 desc->callback_param = cb_param;
94 cookie = dmaengine_submit(desc);
96 return dma_submit_error(cookie);
99 int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *rx_sg,
100 int rx_nents, struct scatterlist *tx_sg, int tx_nents,
101 dma_async_tx_callback cb, void *cb_param)
103 struct dma_chan *rxchan = dma->rxchan;
104 struct dma_chan *txchan = dma->txchan;
105 unsigned long flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
108 ret = qce_dma_prep_sg(rxchan, rx_sg, rx_nents, flags, DMA_MEM_TO_DEV,
113 return qce_dma_prep_sg(txchan, tx_sg, tx_nents, flags, DMA_DEV_TO_MEM,
117 void qce_dma_issue_pending(struct qce_dma_data *dma)
119 dma_async_issue_pending(dma->rxchan);
120 dma_async_issue_pending(dma->txchan);
123 int qce_dma_terminate_all(struct qce_dma_data *dma)
127 ret = dmaengine_terminate_all(dma->rxchan);
128 return ret ?: dmaengine_terminate_all(dma->txchan);