1 /* 2 * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 and 6 * only version 2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include <linux/dmaengine.h> 15 #include <crypto/scatterwalk.h> 16 17 #include "dma.h" 18 19 int qce_dma_request(struct device *dev, struct qce_dma_data *dma) 20 { 21 int ret; 22 23 dma->txchan = dma_request_slave_channel_reason(dev, "tx"); 24 if (IS_ERR(dma->txchan)) 25 return PTR_ERR(dma->txchan); 26 27 dma->rxchan = dma_request_slave_channel_reason(dev, "rx"); 28 if (IS_ERR(dma->rxchan)) { 29 ret = PTR_ERR(dma->rxchan); 30 goto error_rx; 31 } 32 33 dma->result_buf = kmalloc(QCE_RESULT_BUF_SZ + QCE_IGNORE_BUF_SZ, 34 GFP_KERNEL); 35 if (!dma->result_buf) { 36 ret = -ENOMEM; 37 goto error_nomem; 38 } 39 40 dma->ignore_buf = dma->result_buf + QCE_RESULT_BUF_SZ; 41 42 return 0; 43 error_nomem: 44 dma_release_channel(dma->rxchan); 45 error_rx: 46 dma_release_channel(dma->txchan); 47 return ret; 48 } 49 50 void qce_dma_release(struct qce_dma_data *dma) 51 { 52 dma_release_channel(dma->txchan); 53 dma_release_channel(dma->rxchan); 54 kfree(dma->result_buf); 55 } 56 57 struct scatterlist * 58 qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl) 59 { 60 struct scatterlist *sg = sgt->sgl, *sg_last = NULL; 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) { 72 sg_set_page(sg, sg_page(new_sgl), new_sgl->length, 73 new_sgl->offset); 74 sg_last = sg; 75 sg = sg_next(sg); 76 new_sgl = sg_next(new_sgl); 77 } 78 79 return sg_last; 80 } 81 82 static int qce_dma_prep_sg(struct dma_chan *chan, struct scatterlist *sg, 83 int nents, unsigned long flags, 84 enum dma_transfer_direction dir, 85 dma_async_tx_callback cb, void *cb_param) 86 { 87 struct dma_async_tx_descriptor *desc; 88 dma_cookie_t cookie; 89 90 if (!sg || !nents) 91 return -EINVAL; 92 93 desc = dmaengine_prep_slave_sg(chan, sg, nents, dir, flags); 94 if (!desc) 95 return -EINVAL; 96 97 desc->callback = cb; 98 desc->callback_param = cb_param; 99 cookie = dmaengine_submit(desc); 100 101 return dma_submit_error(cookie); 102 } 103 104 int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *rx_sg, 105 int rx_nents, struct scatterlist *tx_sg, int tx_nents, 106 dma_async_tx_callback cb, void *cb_param) 107 { 108 struct dma_chan *rxchan = dma->rxchan; 109 struct dma_chan *txchan = dma->txchan; 110 unsigned long flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK; 111 int ret; 112 113 ret = qce_dma_prep_sg(rxchan, rx_sg, rx_nents, flags, DMA_MEM_TO_DEV, 114 NULL, NULL); 115 if (ret) 116 return ret; 117 118 return qce_dma_prep_sg(txchan, tx_sg, tx_nents, flags, DMA_DEV_TO_MEM, 119 cb, cb_param); 120 } 121 122 void qce_dma_issue_pending(struct qce_dma_data *dma) 123 { 124 dma_async_issue_pending(dma->rxchan); 125 dma_async_issue_pending(dma->txchan); 126 } 127 128 int qce_dma_terminate_all(struct qce_dma_data *dma) 129 { 130 int ret; 131 132 ret = dmaengine_terminate_all(dma->rxchan); 133 return ret ?: dmaengine_terminate_all(dma->txchan); 134 } 135