drivers/crypto/qce/dma.c

   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
  11 int 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;
  35 error_nomem:
  36         dma_release_channel(dma->rxchan);
  37 error_rx:
  38         dma_release_channel(dma->txchan);
  39         return ret;
  40 }
  41
  42 void 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
  49 struct scatterlist *
  50 qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl,
  51                 int max_ents)
  52 {
  53         struct scatterlist *sg = sgt->sgl, *sg_last = NULL;
  54
  55         while (sg) {
  56                 if (!sg_page(sg))
  57                         break;
  58                 sg = sg_next(sg);
  59         }
  60
  61         if (!sg)
  62                 return ERR_PTR(-EINVAL);
  63
  64         while (new_sgl && sg && max_ents) {
  65                 sg_set_page(sg, sg_page(new_sgl), new_sgl->length,
  66                             new_sgl->offset);
  67                 sg_last = sg;
  68                 sg = sg_next(sg);
  69                 new_sgl = sg_next(new_sgl);
  70                 max_ents--;
  71         }
  72
  73         return sg_last;
  74 }
  75
  76 static int qce_dma_prep_sg(struct dma_chan *chan, struct scatterlist *sg,
  77                            int nents, unsigned long flags,
  78                            enum dma_transfer_direction dir,
  79                            dma_async_tx_callback cb, void *cb_param)
  80 {
  81         struct dma_async_tx_descriptor *desc;
  82         dma_cookie_t cookie;
  83
  84         if (!sg || !nents)
  85                 return -EINVAL;
  86
  87         desc = dmaengine_prep_slave_sg(chan, sg, nents, dir, flags);
  88         if (!desc)
  89                 return -EINVAL;
  90
  91         desc->callback = cb;
  92         desc->callback_param = cb_param;
  93         cookie = dmaengine_submit(desc);
  94
  95         return dma_submit_error(cookie);
  96 }
  97
  98 int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *rx_sg,
  99                      int rx_nents, struct scatterlist *tx_sg, int tx_nents,
 100                      dma_async_tx_callback cb, void *cb_param)
 101 {
 102         struct dma_chan *rxchan = dma->rxchan;
 103         struct dma_chan *txchan = dma->txchan;
 104         unsigned long flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
 105         int ret;
 106
 107         ret = qce_dma_prep_sg(rxchan, rx_sg, rx_nents, flags, DMA_MEM_TO_DEV,
 108                              NULL, NULL);
 109         if (ret)
 110                 return ret;
 111
 112         return qce_dma_prep_sg(txchan, tx_sg, tx_nents, flags, DMA_DEV_TO_MEM,
 113                                cb, cb_param);
 114 }
 115
 116 void qce_dma_issue_pending(struct qce_dma_data *dma)
 117 {
 118         dma_async_issue_pending(dma->rxchan);
 119         dma_async_issue_pending(dma->txchan);
 120 }
 121
 122 int qce_dma_terminate_all(struct qce_dma_data *dma)
 123 {
 124         int ret;
 125
 126         ret = dmaengine_terminate_all(dma->rxchan);
 127         return ret ?: dmaengine_terminate_all(dma->txchan);
 128 }