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/*

 * GPIO device simulation in PKUnity SoC

 *

 * Copyright (C) 2010-2012 Guan Xuetao

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation, or any later version.

 * See the COPYING file in the top-level directory.

 */

#include "hw/hw.h"

#include "hw/sysbus.h"

#undef DEBUG_PUV3

#include "hw/unicore32/puv3.h"

#define TYPE_PUV3_GPIO "puv3_gpio"

#define PUV3_GPIO(obj) OBJECT_CHECK(PUV3GPIOState, (obj), TYPE_PUV3_GPIO)

typedef struct PUV3GPIOState {

    SysBusDevice parent_obj;

    MemoryRegion iomem;

    qemu_irq irq[9];

    uint32_t reg_GPLR;

    uint32_t reg_GPDR;

    uint32_t reg_GPIR;

} PUV3GPIOState;

static uint64_t puv3_gpio_read(void *opaque, hwaddr offset,

        unsigned size)

{

    PUV3GPIOState *s = opaque;

    uint32_t ret = 0;

    switch (offset) {

    case 0x00:

        ret = s->reg_GPLR;

        break;

    case 0x04:

        ret = s->reg_GPDR;

        break;

    case 0x20:

        ret = s->reg_GPIR;

        break;

    default:

        DPRINTF("Bad offset 0x%x\n", offset);

    }

    DPRINTF("offset 0x%x, value 0x%x\n", offset, ret);

    return ret;

}

static void puv3_gpio_write(void *opaque, hwaddr offset,

        uint64_t value, unsigned size)

{

    PUV3GPIOState *s = opaque;

    DPRINTF("offset 0x%x, value 0x%x\n", offset, value);

    switch (offset) {

    case 0x04:

        s->reg_GPDR = value;

        break;

    case 0x08:

        if (s->reg_GPDR & value) {

            s->reg_GPLR |= value;

        } else {

            DPRINTF("Write gpio input port error!");

        }

        break;

    case 0x0c:

        if (s->reg_GPDR & value) {

            s->reg_GPLR &= ~value;

        } else {

            DPRINTF("Write gpio input port error!");

        }

        break;

    case 0x10: /* GRER */

    case 0x14: /* GFER */

    case 0x18: /* GEDR */

        break;

    case 0x20: /* GPIR */

        s->reg_GPIR = value;

        break;

    default:

        DPRINTF("Bad offset 0x%x\n", offset);

    }

}

static const MemoryRegionOps puv3_gpio_ops = {

    .read = puv3_gpio_read,

    .write = puv3_gpio_write,

    .impl = {

        .min_access_size = 4,

        .max_access_size = 4,

    },

    .endianness = DEVICE_NATIVE_ENDIAN,

};

static int puv3_gpio_init(SysBusDevice *dev)

{

    PUV3GPIOState *s = PUV3_GPIO(dev);

    s->reg_GPLR = 0;

    s->reg_GPDR = 0;

    /* FIXME: these irqs not handled yet */

    sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW0]);

    sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW1]);

    sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW2]);

    sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW3]);

    sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW4]);

    sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW5]);

    sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW6]);

    sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOLOW7]);

    sysbus_init_irq(dev, &s->irq[PUV3_IRQS_GPIOHIGH]);

    memory_region_init_io(&s->iomem, OBJECT(s), &puv3_gpio_ops, s, "puv3_gpio",

            PUV3_REGS_OFFSET);

    sysbus_init_mmio(dev, &s->iomem);

    return 0;

}

static void puv3_gpio_class_init(ObjectClass *klass, void *data)

{

    SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);

    sdc->init = puv3_gpio_init;

}

static const TypeInfo puv3_gpio_info = {

    .name = TYPE_PUV3_GPIO,

    .parent = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(PUV3GPIOState),

    .class_init = puv3_gpio_class_init,

};

static void puv3_gpio_register_type(void)

{

    type_register_static(&puv3_gpio_info);

}

type_init(puv3_gpio_register_type)