xref: /openbmc/linux/drivers/crypto/qce/dma.h (revision d6364b81)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
4  */
5 
6 #ifndef _DMA_H_
7 #define _DMA_H_
8 
9 #include <linux/dmaengine.h>
10 
11 /* maximum data transfer block size between BAM and CE */
12 #define QCE_BAM_BURST_SIZE		64
13 
14 #define QCE_AUTHIV_REGS_CNT		16
15 #define QCE_AUTH_BYTECOUNT_REGS_CNT	4
16 #define QCE_CNTRIV_REGS_CNT		4
17 
18 struct qce_result_dump {
19 	u32 auth_iv[QCE_AUTHIV_REGS_CNT];
20 	u32 auth_byte_count[QCE_AUTH_BYTECOUNT_REGS_CNT];
21 	u32 encr_cntr_iv[QCE_CNTRIV_REGS_CNT];
22 	u32 status;
23 	u32 status2;
24 };
25 
26 #define QCE_IGNORE_BUF_SZ	(2 * QCE_BAM_BURST_SIZE)
27 #define QCE_RESULT_BUF_SZ	\
28 		ALIGN(sizeof(struct qce_result_dump), QCE_BAM_BURST_SIZE)
29 
30 struct qce_dma_data {
31 	struct dma_chan *txchan;
32 	struct dma_chan *rxchan;
33 	struct qce_result_dump *result_buf;
34 	void *ignore_buf;
35 };
36 
37 int qce_dma_request(struct device *dev, struct qce_dma_data *dma);
38 void qce_dma_release(struct qce_dma_data *dma);
39 int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *sg_in,
40 		     int in_ents, struct scatterlist *sg_out, int out_ents,
41 		     dma_async_tx_callback cb, void *cb_param);
42 void qce_dma_issue_pending(struct qce_dma_data *dma);
43 int qce_dma_terminate_all(struct qce_dma_data *dma);
44 struct scatterlist *
45 qce_sgtable_add(struct sg_table *sgt, struct scatterlist *sg_add,
46 		unsigned int max_len);
47 
48 #endif /* _DMA_H_ */
49