include/uapi/linux/aspeed-lpc-ctrl.h

   1 /*
   2  * Copyright 2017 IBM Corp.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #ifndef _UAPI_LINUX_ASPEED_LPC_CTRL_H
  11 #define _UAPI_LINUX_ASPEED_LPC_CTRL_H
  12
  13 #include <linux/ioctl.h>
  14 #include <linux/types.h>
  15
  16 /* Window types */
  17 #define ASPEED_LPC_CTRL_WINDOW_FLASH    1
  18 #define ASPEED_LPC_CTRL_WINDOW_MEMORY   2
  19
  20 /*
  21  * This driver provides a window for the host to access a BMC resource
  22  * across the BMC <-> Host LPC bus.
  23  *
  24  * window_type: The BMC resource that the host will access through the
  25  * window. BMC flash and BMC RAM.
  26  *
  27  * window_id: For each window type there may be multiple windows,
  28  * these are referenced by ID.
  29  *
  30  * flags: Reserved for future use, this field is expected to be
  31  * zeroed.
  32  *
  33  * addr: Address on the host LPC bus that the specified window should
  34  * be mapped. This address must be power of two aligned.
  35  *
  36  * offset: Offset into the BMC window that should be mapped to the
  37  * host (at addr). This must be a multiple of size.
  38  *
  39  * size: The size of the mapping. The smallest possible size is 64K.
  40  * This must be power of two aligned.
  41  *
  42  */
  43
  44 struct aspeed_lpc_ctrl_mapping {
  45         __u8    window_type;
  46         __u8    window_id;
  47         __u16   flags;
  48         __u32   addr;
  49         __u32   offset;
  50         __u32   size;
  51 };
  52
  53 #define __ASPEED_LPC_CTRL_IOCTL_MAGIC   0xb2
  54
  55 #define ASPEED_LPC_CTRL_IOCTL_GET_SIZE  _IOWR(__ASPEED_LPC_CTRL_IOCTL_MAGIC, \
  56                 0x00, struct aspeed_lpc_ctrl_mapping)
  57
  58 #define ASPEED_LPC_CTRL_IOCTL_MAP       _IOW(__ASPEED_LPC_CTRL_IOCTL_MAGIC, \
  59                 0x01, struct aspeed_lpc_ctrl_mapping)
  60
  61 #endif /* _UAPI_LINUX_ASPEED_LPC_CTRL_H */