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The ISSEI (Intel Silicon Security Engine Interface) subsystem provides a communication channel between the host and the Silicon Security Engine. Prepare basic driver functions and character device for user-space communication. Add DMA access routines for ISSEI HECI devices. Add of DMA-related structures and implementation of routines for setting up DMA, as well as reading and writing DMA buffers. Reviewed-by: Karol Wachowski <karol.wachowski@linux.intel.com> Co-developed-by: Vitaly Lubart <lubvital@gmail.com> Signed-off-by: Vitaly Lubart <lubvital@gmail.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Link: https://patch.msgid.link/20260513-issei-for-upstream-v1-1-f590038678f9@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) 2023-2026 Intel Corporation */
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#ifndef _ISSEI_DMA_H_
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#define _ISSEI_DMA_H_
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#include <linux/types.h>
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struct issei_device;
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/**
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* struct issei_dma_length - sizes of DMA memory portions
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* @h2f: host to firmware buffer size
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* @f2h: firmware to host buffer size
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* @ctl: control buffer size
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*/
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struct issei_dma_length {
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size_t h2f;
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size_t f2h;
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size_t ctl;
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};
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/**
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* struct issei_dma - DMA memory structure
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* @vaddr: virtual address
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* @daddr: physical address
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* @length: memory sizes structure
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*/
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struct issei_dma {
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void *vaddr;
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dma_addr_t daddr;
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struct issei_dma_length length;
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};
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/* Operation statuses */
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#define HAMS_SUCCESS 0x00
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#define HAMS_PROTOCOL_NOT_SUPPORTED 0x01
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#define HAMS_DEPRECATED_BUS_MSG 0x02
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#define HAMS_CLIENT_NOT_EXISTS 0x03
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#define HAMS_MSG_TOO_BIG 0x04
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#define HAMS_MSG_NOT_CONSUMED 0x05
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#define HAMS_CORRUPTED_BUS_MSG 0x06
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#define HAMS_CORRUPTED_HEADER 0x07
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#define HAMS_INVALID_LENGTH 0x08
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#define HAMS_SHARED_MEMORY_SIZE_UNSUPPORTED 0x09
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#define HAMS_GENERAL_FATAL_ERROR 0xff
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/**
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* struct issei_dma_data - data passed through channel
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* @fw_id: firmware client id
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* @host_id: host client id
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* @flags: flags bitmap
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* @status: operation status
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* @length: data length
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* @buf: pointer to data buffer
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*/
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struct issei_dma_data {
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u16 fw_id;
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u16 host_id;
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u32 flags;
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u32 status;
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u32 length;
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void *buf;
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};
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int issei_dmam_setup(struct issei_device *idev);
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int issei_dma_write(struct issei_device *idev, const struct issei_dma_data *data);
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int issei_dma_read(struct issei_device *idev, struct issei_dma_data *data);
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#endif /*_ISSEI_DMA_H_*/
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