include/hw/misc/mps2-fpgaio.h

   1 /*
   2  * ARM MPS2 FPGAIO emulation
   3  *
   4  * Copyright (c) 2018 Linaro Limited
   5  * Written by Peter Maydell
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 or
   9  *  (at your option) any later version.
  10  */
  11
  12 /* This is a model of the FPGAIO register block in the AN505
  13  * FPGA image for the MPS2 dev board; it is documented in the
  14  * application note:
  15  * http://infocenter.arm.com/help/topic/com.arm.doc.dai0505b/index.html
  16  *
  17  * QEMU interface:
  18  *  + sysbus MMIO region 0: the register bank
  19  */
  20
  21 #ifndef MPS2_FPGAIO_H
  22 #define MPS2_FPGAIO_H
  23
  24 #include "hw/sysbus.h"
  25 #include "qom/object.h"
  26
  27 #define TYPE_MPS2_FPGAIO "mps2-fpgaio"
  28 typedef struct MPS2FPGAIO MPS2FPGAIO;
  29 DECLARE_INSTANCE_CHECKER(MPS2FPGAIO, MPS2_FPGAIO,
  30                          TYPE_MPS2_FPGAIO)
  31
  32 struct MPS2FPGAIO {
  33     /*< private >*/
  34     SysBusDevice parent_obj;
  35
  36     /*< public >*/
  37     MemoryRegion iomem;
  38
  39     uint32_t led0;
  40     uint32_t prescale;
  41     uint32_t misc;
  42
  43     /* QEMU_CLOCK_VIRTUAL time at which counter and pscntr were last synced */
  44     int64_t pscntr_sync_ticks;
  45     /* Values of COUNTER and PSCNTR at time pscntr_sync_ticks */
  46     uint32_t counter;
  47     uint32_t pscntr;
  48
  49     uint32_t prescale_clk;
  50
  51     /* These hold the CLOCK_VIRTUAL ns tick when the CLK1HZ/CLK100HZ was zero */
  52     int64_t clk1hz_tick_offset;
  53     int64_t clk100hz_tick_offset;
  54 };
  55
  56 #endif