xref: /openbmc/qemu/include/hw/misc/mps2-scc.h (revision 3ff11e4dcabe2b5b4c26e49d741018ec326f127f)

/*
 * ARM MPS2 SCC emulation
 *
 * Copyright (c) 2017 Linaro Limited
 * Written by Peter Maydell
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 or
 *  (at your option) any later version.
 */

/*
 * This is a model of the Serial Communication Controller (SCC)
 * block found in most MPS FPGA images.
 *
 * QEMU interface:
 *  + sysbus MMIO region 0: the register bank
 *  + QOM property "scc-cfg4": value of the read-only CFG4 register
 *  + QOM property "scc-aid": value of the read-only SCC_AID register
 *  + QOM property "scc-id": value of the read-only SCC_ID register
 *  + QOM property "scc-cfg0": reset value of the CFG0 register
 *  + QOM property array "oscclk": reset values of the OSCCLK registers
 *    (which are accessed via the SYS_CFG channel provided by this device)
 *  + named GPIO output "remap": this tracks the value of CFG0 register
 *    bit 0. Boards where this bit controls memory remapping should
 *    connect this GPIO line to a function performing that mapping.
 *    Boards where bit 0 has no special function should leave the GPIO
 *    output disconnected.
 */
#ifndef MPS2_SCC_H
#define MPS2_SCC_H

#include "hw/sysbus.h"
#include "hw/misc/led.h"
#include "qom/object.h"

#define TYPE_MPS2_SCC "mps2-scc"
OBJECT_DECLARE_SIMPLE_TYPE(MPS2SCC, MPS2_SCC)

struct MPS2SCC {
    /*< private >*/
    SysBusDevice parent_obj;

    /*< public >*/
    MemoryRegion iomem;
    LEDState *led[8];

    uint32_t cfg0;
    uint32_t cfg1;
    uint32_t cfg2;
    uint32_t cfg4;
    uint32_t cfg5;
    uint32_t cfg6;
    uint32_t cfg7;
    uint32_t cfgdata_rtn;
    uint32_t cfgdata_out;
    uint32_t cfgctrl;
    uint32_t cfgstat;
    uint32_t dll;
    uint32_t aid;
    uint32_t id;
    uint32_t num_oscclk;
    uint32_t *oscclk;
    uint32_t *oscclk_reset;
    uint32_t cfg0_reset;

    qemu_irq remap;
};

#endif