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120 lines
3.9 KiB
120 lines
3.9 KiB
4 months ago
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/* Copyright (c) 2015-2017, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _SPCOM_H_
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#define _SPCOM_H_
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#include <linux/types.h> /* uint32_t, bool */
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#ifndef BIT
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#define BIT(x) (1 << x)
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#endif
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#ifndef PAGE_SIZE
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#define PAGE_SIZE 4096
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#endif
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/**
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* @brief - Secure Processor Communication interface to user space spcomlib.
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*
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* Sending data and control commands by write() file operation.
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* Receiving data by read() file operation.
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* Getting the next request size by read() file operation,
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* with special size SPCOM_GET_NEXT_REQUEST_SIZE.
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*/
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/*
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* Maximum number of channel between Secure Processor and HLOS.
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* including predefined channels, like "sp_kernel".
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*/
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#define SPCOM_MAX_CHANNELS 0x20
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/* Maximum size (including null) for channel names */
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#define SPCOM_CHANNEL_NAME_SIZE 32
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/*
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* file read(fd, buf, size) with this size,
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* hints the kernel that user space wants to read the next-req-size.
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* This size is bigger than both SPCOM_MAX_REQUEST_SIZE and
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* SPCOM_MAX_RESPONSE_SIZE , so it is not a valid data size.
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*/
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#define SPCOM_GET_NEXT_REQUEST_SIZE (PAGE_SIZE-1)
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/* Command Id between spcomlib and spcom driver, on write() */
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enum spcom_cmd_id {
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SPCOM_CMD_LOAD_APP = 0x4C4F4144, /* "LOAD" = 0x4C4F4144 */
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SPCOM_CMD_RESET_SP = 0x52455354, /* "REST" = 0x52455354 */
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SPCOM_CMD_SEND = 0x53454E44, /* "SEND" = 0x53454E44 */
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SPCOM_CMD_SEND_MODIFIED = 0x534E444D, /* "SNDM" = 0x534E444D */
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SPCOM_CMD_LOCK_ION_BUF = 0x4C4F434B, /* "LOCK" = 0x4C4F434B */
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SPCOM_CMD_UNLOCK_ION_BUF = 0x554C434B, /* "ULCK" = 0x4C4F434B */
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SPCOM_CMD_FSSR = 0x46535352, /* "FSSR" = 0x46535352 */
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SPCOM_CMD_CREATE_CHANNEL = 0x43524554, /* "CRET" = 0x43524554 */
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};
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/*
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* @note: Event types that are always implicitly polled:
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* POLLERR=0x08 | POLLHUP=0x10 | POLLNVAL=0x20
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* so bits 3,4,5 can't be used
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*/
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enum spcom_poll_events {
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SPCOM_POLL_LINK_STATE = BIT(1),
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SPCOM_POLL_CH_CONNECT = BIT(2),
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SPCOM_POLL_READY_FLAG = BIT(14), /* output */
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SPCOM_POLL_WAIT_FLAG = BIT(15), /* if set , wait for the event */
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};
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/* Common Command structure between User Space and spcom driver, on write() */
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struct spcom_user_command {
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enum spcom_cmd_id cmd_id;
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uint32_t arg;
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} __attribute__((packed));
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/* Command structure between User Space and spcom driver, on write() */
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struct spcom_send_command {
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enum spcom_cmd_id cmd_id;
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uint32_t timeout_msec;
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uint32_t buf_size;
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char buf[0]; /* Variable buffer size - must be last field */
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} __attribute__((packed));
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/* Command structure between userspace spcomlib and spcom driver, on write() */
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struct spcom_user_create_channel_command {
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enum spcom_cmd_id cmd_id;
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char ch_name[SPCOM_CHANNEL_NAME_SIZE];
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} __attribute__((packed));
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/* maximum ION buf for send-modfied-command */
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#define SPCOM_MAX_ION_BUF 4
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struct spcom_ion_info {
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int32_t fd; /* ION buffer File Descriptor, set -1 for invalid fd */
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uint32_t buf_offset; /* virtual address offset in request/response */
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};
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/* Pass this FD to unlock all ION buffer for the specific channel */
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#define SPCOM_ION_FD_UNLOCK_ALL 0xFFFF
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struct spcom_ion_handle {
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int32_t fd; /* File Descriptor associated with the buffer */
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};
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/* Command structure between User Space and spcom driver, on write() */
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struct spcom_user_send_modified_command {
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enum spcom_cmd_id cmd_id;
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struct spcom_ion_info ion_info[SPCOM_MAX_ION_BUF];
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uint32_t timeout_msec;
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uint32_t buf_size;
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char buf[0]; /* Variable buffer size - must be last field */
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} __attribute__((packed));
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#endif /* _SPCOM_H_ */
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