63 lines · c
1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */2/*3 * Copyright 2019 Google Inc4 *5 * This program is free software; you can redistribute it and/or6 * modify it under the terms of the GNU General Public License7 * as published by the Free Software Foundation; either version8 * 2 of the License, or (at your option) any later version.9 *10 * Provides a simple driver to control the ASPEED P2A interface which allows11 * the host to read and write to various regions of the BMC's memory.12 */13 14#ifndef _UAPI_LINUX_ASPEED_P2A_CTRL_H15#define _UAPI_LINUX_ASPEED_P2A_CTRL_H16 17#include <linux/ioctl.h>18#include <linux/types.h>19 20#define ASPEED_P2A_CTRL_READ_ONLY 021#define ASPEED_P2A_CTRL_READWRITE 122 23/*24 * This driver provides a mechanism for enabling or disabling the read-write25 * property of specific windows into the ASPEED BMC's memory.26 *27 * A user can map a region of the BMC's memory as read-only or read-write, with28 * the caveat that once any region is mapped, all regions are unlocked for29 * reading.30 */31 32/*33 * Unlock a region of BMC physical memory for access from the host.34 *35 * Also used to read back the optional memory-region configuration for the36 * driver.37 */38struct aspeed_p2a_ctrl_mapping {39 __u64 addr;40 __u32 length;41 __u32 flags;42};43 44#define __ASPEED_P2A_CTRL_IOCTL_MAGIC 0xb345 46/*47 * This IOCTL is meant to configure a region or regions of memory given a48 * starting address and length to be readable by the host, or49 * readable-writeable.50 */51#define ASPEED_P2A_CTRL_IOCTL_SET_WINDOW _IOW(__ASPEED_P2A_CTRL_IOCTL_MAGIC, \52 0x00, struct aspeed_p2a_ctrl_mapping)53 54/*55 * This IOCTL is meant to read back to the user the base address and length of56 * the memory-region specified to the driver for use with mmap.57 */58#define ASPEED_P2A_CTRL_IOCTL_GET_MEMORY_CONFIG \59 _IOWR(__ASPEED_P2A_CTRL_IOCTL_MAGIC, \60 0x01, struct aspeed_p2a_ctrl_mapping)61 62#endif /* _UAPI_LINUX_ASPEED_P2A_CTRL_H */63