1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
4 */
5
6#include <linux/dmaengine.h>
7#include <crypto/scatterwalk.h>
8
9#include "dma.h"
10
11int qce_dma_request(struct device *dev, struct qce_dma_data *dma)
12{
13	int ret;
14
15	dma->txchan = dma_request_chan(dev, "tx");
16	if (IS_ERR(dma->txchan))
17		return PTR_ERR(dma->txchan);
18
19	dma->rxchan = dma_request_chan(dev, "rx");
20	if (IS_ERR(dma->rxchan)) {
21		ret = PTR_ERR(dma->rxchan);
22		goto error_rx;
23	}
24
25	dma->result_buf = kmalloc(QCE_RESULT_BUF_SZ + QCE_IGNORE_BUF_SZ,
26				  GFP_KERNEL);
27	if (!dma->result_buf) {
28		ret = -ENOMEM;
29		goto error_nomem;
30	}
31
32	dma->ignore_buf = dma->result_buf + QCE_RESULT_BUF_SZ;
33
34	return 0;
35error_nomem:
36	dma_release_channel(dma->rxchan);
37error_rx:
38	dma_release_channel(dma->txchan);
39	return ret;
40}
41
42void qce_dma_release(struct qce_dma_data *dma)
43{
44	dma_release_channel(dma->txchan);
45	dma_release_channel(dma->rxchan);
46	kfree(dma->result_buf);
47}
48
49struct scatterlist *
50qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl,
51		unsigned int max_len)
52{
53	struct scatterlist *sg = sgt->sgl, *sg_last = NULL;
54	unsigned int new_len;
55
56	while (sg) {
57		if (!sg_page(sg))
58			break;
59		sg = sg_next(sg);
60	}
61
62	if (!sg)
63		return ERR_PTR(-EINVAL);
64
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);
68		sg_last = sg;
69		sg = sg_next(sg);
70		new_sgl = sg_next(new_sgl);
71		max_len -= new_len;
72	}
73
74	return sg_last;
75}
76
77static 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)
81{
82	struct dma_async_tx_descriptor *desc;
83	dma_cookie_t cookie;
84
85	if (!sg || !nents)
86		return -EINVAL;
87
88	desc = dmaengine_prep_slave_sg(chan, sg, nents, dir, flags);
89	if (!desc)
90		return -EINVAL;
91
92	desc->callback = cb;
93	desc->callback_param = cb_param;
94	cookie = dmaengine_submit(desc);
95
96	return dma_submit_error(cookie);
97}
98
99int 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)
102{
103	struct dma_chan *rxchan = dma->rxchan;
104	struct dma_chan *txchan = dma->txchan;
105	unsigned long flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
106	int ret;
107
108	ret = qce_dma_prep_sg(rxchan, rx_sg, rx_nents, flags, DMA_MEM_TO_DEV,
109			     NULL, NULL);
110	if (ret)
111		return ret;
112
113	return qce_dma_prep_sg(txchan, tx_sg, tx_nents, flags, DMA_DEV_TO_MEM,
114			       cb, cb_param);
115}
116
117void qce_dma_issue_pending(struct qce_dma_data *dma)
118{
119	dma_async_issue_pending(dma->rxchan);
120	dma_async_issue_pending(dma->txchan);
121}
122
123int qce_dma_terminate_all(struct qce_dma_data *dma)
124{
125	int ret;
126
127	ret = dmaengine_terminate_all(dma->rxchan);
128	return ret ?: dmaengine_terminate_all(dma->txchan);
129}
130