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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/device.h>
7#include <linux/dmaengine.h>
8#include <crypto/scatterwalk.h>
9
10#include "dma.h"
11
12static void qce_dma_release(void *data)
13{
14 struct qce_dma_data *dma = data;
15
16 dma_release_channel(dma->txchan);
17 dma_release_channel(dma->rxchan);
18 kfree(dma->result_buf);
19}
20
21int devm_qce_dma_request(struct device *dev, struct qce_dma_data *dma)
22{
23 int ret;
24
25 dma->txchan = dma_request_chan(dev, "tx");
26 if (IS_ERR(dma->txchan))
27 return dev_err_probe(dev, PTR_ERR(dma->txchan),
28 "Failed to get TX DMA channel\n");
29
30 dma->rxchan = dma_request_chan(dev, "rx");
31 if (IS_ERR(dma->rxchan)) {
32 ret = dev_err_probe(dev, PTR_ERR(dma->rxchan),
33 "Failed to get RX DMA channel\n");
34 goto error_rx;
35 }
36
37 dma->result_buf = kmalloc(QCE_RESULT_BUF_SZ + QCE_IGNORE_BUF_SZ,
38 GFP_KERNEL);
39 if (!dma->result_buf) {
40 ret = -ENOMEM;
41 goto error_nomem;
42 }
43
44 dma->ignore_buf = dma->result_buf + QCE_RESULT_BUF_SZ;
45
46 return devm_add_action_or_reset(dev, qce_dma_release, dma);
47
48error_nomem:
49 dma_release_channel(dma->rxchan);
50error_rx:
51 dma_release_channel(dma->txchan);
52 return ret;
53}
54
55struct scatterlist *
56qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl,
57 unsigned int max_len)
58{
59 struct scatterlist *sg = sgt->sgl, *sg_last = NULL;
60 unsigned int new_len;
61
62 while (sg) {
63 if (!sg_page(sg))
64 break;
65 sg = sg_next(sg);
66 }
67
68 if (!sg)
69 return ERR_PTR(-EINVAL);
70
71 while (new_sgl && sg && max_len) {
72 new_len = new_sgl->length > max_len ? max_len : new_sgl->length;
73 sg_set_page(sg, sg_page(new_sgl), new_len, new_sgl->offset);
74 sg_last = sg;
75 sg = sg_next(sg);
76 new_sgl = sg_next(new_sgl);
77 max_len -= new_len;
78 }
79
80 return sg_last;
81}
82
83static int qce_dma_prep_sg(struct dma_chan *chan, struct scatterlist *sg,
84 int nents, unsigned long flags,
85 enum dma_transfer_direction dir,
86 dma_async_tx_callback cb, void *cb_param)
87{
88 struct dma_async_tx_descriptor *desc;
89 dma_cookie_t cookie;
90
91 if (!sg || !nents)
92 return -EINVAL;
93
94 desc = dmaengine_prep_slave_sg(chan, sg, nents, dir, flags);
95 if (!desc)
96 return -EINVAL;
97
98 desc->callback = cb;
99 desc->callback_param = cb_param;
100 cookie = dmaengine_submit(desc);
101
102 return dma_submit_error(cookie);
103}
104
105int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *rx_sg,
106 int rx_nents, struct scatterlist *tx_sg, int tx_nents,
107 dma_async_tx_callback cb, void *cb_param)
108{
109 struct dma_chan *rxchan = dma->rxchan;
110 struct dma_chan *txchan = dma->txchan;
111 unsigned long flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
112 int ret;
113
114 ret = qce_dma_prep_sg(rxchan, rx_sg, rx_nents, flags, DMA_MEM_TO_DEV,
115 NULL, NULL);
116 if (ret)
117 return ret;
118
119 return qce_dma_prep_sg(txchan, tx_sg, tx_nents, flags, DMA_DEV_TO_MEM,
120 cb, cb_param);
121}
122
123void qce_dma_issue_pending(struct qce_dma_data *dma)
124{
125 dma_async_issue_pending(dma->rxchan);
126 dma_async_issue_pending(dma->txchan);
127}
128
129int qce_dma_terminate_all(struct qce_dma_data *dma)
130{
131 int ret;
132
133 ret = dmaengine_terminate_all(dma->rxchan);
134 return ret ?: dmaengine_terminate_all(dma->txchan);
135}