drivers/crypto/qce/dma.h

   1 /*
   2  * Copyright (c) 2011-2014, 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 #ifndef _DMA_H_
  15 #define _DMA_H_
  16
  17 #include <linux/dmaengine.h>
  18
  19 /* maximum data transfer block size between BAM and CE */
  20 #define QCE_BAM_BURST_SIZE              64
  21
  22 #define QCE_AUTHIV_REGS_CNT             16
  23 #define QCE_AUTH_BYTECOUNT_REGS_CNT     4
  24 #define QCE_CNTRIV_REGS_CNT             4
  25
  26 struct qce_result_dump {
  27         u32 auth_iv[QCE_AUTHIV_REGS_CNT];
  28         u32 auth_byte_count[QCE_AUTH_BYTECOUNT_REGS_CNT];
  29         u32 encr_cntr_iv[QCE_CNTRIV_REGS_CNT];
  30         u32 status;
  31         u32 status2;
  32 };
  33
  34 #define QCE_IGNORE_BUF_SZ       (2 * QCE_BAM_BURST_SIZE)
  35 #define QCE_RESULT_BUF_SZ       \
  36                 ALIGN(sizeof(struct qce_result_dump), QCE_BAM_BURST_SIZE)
  37
  38 struct qce_dma_data {
  39         struct dma_chan *txchan;
  40         struct dma_chan *rxchan;
  41         struct qce_result_dump *result_buf;
  42         void *ignore_buf;
  43 };
  44
  45 int qce_dma_request(struct device *dev, struct qce_dma_data *dma);
  46 void qce_dma_release(struct qce_dma_data *dma);
  47 int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *sg_in,
  48                      int in_ents, struct scatterlist *sg_out, int out_ents,
  49                      dma_async_tx_callback cb, void *cb_param);
  50 void qce_dma_issue_pending(struct qce_dma_data *dma);
  51 int qce_dma_terminate_all(struct qce_dma_data *dma);
  52 int qce_countsg(struct scatterlist *sg_list, int nbytes, bool *chained);
  53 void qce_unmapsg(struct device *dev, struct scatterlist *sg, int nents,
  54                  enum dma_data_direction dir, bool chained);
  55 int qce_mapsg(struct device *dev, struct scatterlist *sg, int nents,
  56               enum dma_data_direction dir, bool chained);
  57 struct scatterlist *
  58 qce_sgtable_add(struct sg_table *sgt, struct scatterlist *sg_add);
  59
  60 #endif /* _DMA_H_ */