/*
 * Intel XScale PXA255/270 PC Card and CompactFlash Interface.
 *
 * Copyright (c) 2006 Openedhand Ltd.
 * Written by Andrzej Zaborowski <balrog@zabor.org>
 *
 * This code is licensed under the GPLv2.
 *
 * Contributions after 2012-01-13 are licensed under the terms of the
 * GNU GPL, version 2 or (at your option) any later version.
 */

#include "qemu/osdep.h"
#include "hw/irq.h"
#include "hw/sysbus.h"
#include "qapi/error.h"
#include "qemu/module.h"
#include "hw/pcmcia.h"
#include "hw/arm/pxa.h"

struct PXA2xxPCMCIAState {
    SysBusDevice parent_obj;

    PCMCIASocket slot;
    MemoryRegion container_mem;
    MemoryRegion common_iomem;
    MemoryRegion attr_iomem;
    MemoryRegion iomem;

    qemu_irq irq;
    qemu_irq cd_irq;

    PCMCIACardState *card;
};

static uint64_t pxa2xx_pcmcia_common_read(void *opaque,
                hwaddr offset, unsigned size)
{
    PXA2xxPCMCIAState *s = (PXA2xxPCMCIAState *) opaque;
    PCMCIACardClass *pcc;

    if (s->slot.attached) {
        pcc = PCMCIA_CARD_GET_CLASS(s->card);
        return pcc->common_read(s->card, offset);
    }

    return 0;
}

static void pxa2xx_pcmcia_common_write(void *opaque, hwaddr offset,
                                       uint64_t value, unsigned size)
{
    PXA2xxPCMCIAState *s = (PXA2xxPCMCIAState *) opaque;
    PCMCIACardClass *pcc;

    if (s->slot.attached) {
        pcc = PCMCIA_CARD_GET_CLASS(s->card);
        pcc->common_write(s->card, offset, value);
    }
}

static uint64_t pxa2xx_pcmcia_attr_read(void *opaque,
                hwaddr offset, unsigned size)
{
    PXA2xxPCMCIAState *s = (PXA2xxPCMCIAState *) opaque;
    PCMCIACardClass *pcc;

    if (s->slot.attached) {
        pcc = PCMCIA_CARD_GET_CLASS(s->card);
        return pcc->attr_read(s->card, offset);
    }

    return 0;
}

static void pxa2xx_pcmcia_attr_write(void *opaque, hwaddr offset,
                                     uint64_t value, unsigned size)
{
    PXA2xxPCMCIAState *s = (PXA2xxPCMCIAState *) opaque;
    PCMCIACardClass *pcc;

    if (s->slot.attached) {
        pcc = PCMCIA_CARD_GET_CLASS(s->card);
        pcc->attr_write(s->card, offset, value);
    }
}

static uint64_t pxa2xx_pcmcia_io_read(void *opaque,
                hwaddr offset, unsigned size)
{
    PXA2xxPCMCIAState *s = (PXA2xxPCMCIAState *) opaque;
    PCMCIACardClass *pcc;

    if (s->slot.attached) {
        pcc = PCMCIA_CARD_GET_CLASS(s->card);
        return pcc->io_read(s->card, offset);
    }

    return 0;
}

static void pxa2xx_pcmcia_io_write(void *opaque, hwaddr offset,
                                   uint64_t value, unsigned size)
{
    PXA2xxPCMCIAState *s = (PXA2xxPCMCIAState *) opaque;
    PCMCIACardClass *pcc;

    if (s->slot.attached) {
        pcc = PCMCIA_CARD_GET_CLASS(s->card);
        pcc->io_write(s->card, offset, value);
    }
}

static const MemoryRegionOps pxa2xx_pcmcia_common_ops = {
    .read = pxa2xx_pcmcia_common_read,
    .write = pxa2xx_pcmcia_common_write,
    .endianness = DEVICE_NATIVE_ENDIAN
};

static const MemoryRegionOps pxa2xx_pcmcia_attr_ops = {
    .read = pxa2xx_pcmcia_attr_read,
    .write = pxa2xx_pcmcia_attr_write,
    .endianness = DEVICE_NATIVE_ENDIAN
};

static const MemoryRegionOps pxa2xx_pcmcia_io_ops = {
    .read = pxa2xx_pcmcia_io_read,
    .write = pxa2xx_pcmcia_io_write,
    .endianness = DEVICE_NATIVE_ENDIAN
};

static void pxa2xx_pcmcia_set_irq(void *opaque, int line, int level)
{
    PXA2xxPCMCIAState *s = (PXA2xxPCMCIAState *) opaque;
    if (!s->irq)
        return;

    qemu_set_irq(s->irq, level);
}

PXA2xxPCMCIAState *pxa2xx_pcmcia_init(MemoryRegion *sysmem,
                                      hwaddr base)
{
    DeviceState *dev;

    dev = sysbus_create_simple(TYPE_PXA2XX_PCMCIA, base, NULL);

    return PXA2XX_PCMCIA(dev);
}

static void pxa2xx_pcmcia_initfn(Object *obj)
{
    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
    PXA2xxPCMCIAState *s = PXA2XX_PCMCIA(obj);

    memory_region_init(&s->container_mem, obj, "container", 0x10000000);
    sysbus_init_mmio(sbd, &s->container_mem);

    /* Socket I/O Memory Space */
    memory_region_init_io(&s->iomem, obj, &pxa2xx_pcmcia_io_ops, s,
                          "pxa2xx-pcmcia-io", 0x04000000);
    memory_region_add_subregion(&s->container_mem, 0x00000000,
                                &s->iomem);

    /* Then next 64 MB is reserved */

    /* Socket Attribute Memory Space */
    memory_region_init_io(&s->attr_iomem, obj, &pxa2xx_pcmcia_attr_ops, s,
                          "pxa2xx-pcmcia-attribute", 0x04000000);
    memory_region_add_subregion(&s->container_mem, 0x08000000,
                                &s->attr_iomem);

    /* Socket Common Memory Space */
    memory_region_init_io(&s->common_iomem, obj, &pxa2xx_pcmcia_common_ops, s,
                          "pxa2xx-pcmcia-common", 0x04000000);
    memory_region_add_subregion(&s->container_mem, 0x0c000000,
                                &s->common_iomem);

    s->slot.irq = qemu_allocate_irq(pxa2xx_pcmcia_set_irq, s, 0);

    object_property_add_link(obj, "card", TYPE_PCMCIA_CARD,
                             (Object **)&s->card,
                             NULL, /* read-only property */
                             0);
}

/* Insert a new card into a slot */
int pxa2xx_pcmcia_attach(void *opaque, PCMCIACardState *card)
{
    PXA2xxPCMCIAState *s = (PXA2xxPCMCIAState *) opaque;
    PCMCIACardClass *pcc;

    if (s->slot.attached) {
        return -EEXIST;
    }

    if (s->cd_irq) {
        qemu_irq_raise(s->cd_irq);
    }

    s->card = card;
    pcc = PCMCIA_CARD_GET_CLASS(s->card);

    s->slot.attached = true;
    s->card->slot = &s->slot;
    pcc->attach(s->card);

    return 0;
}

/* Eject card from the slot */
int pxa2xx_pcmcia_detach(void *opaque)
{
    PXA2xxPCMCIAState *s = (PXA2xxPCMCIAState *) opaque;
    PCMCIACardClass *pcc;

    if (!s->slot.attached) {
        return -ENOENT;
    }

    pcc = PCMCIA_CARD_GET_CLASS(s->card);
    pcc->detach(s->card);
    s->card->slot = NULL;
    s->card = NULL;

    s->slot.attached = false;

    if (s->irq) {
        qemu_irq_lower(s->irq);
    }
    if (s->cd_irq) {
        qemu_irq_lower(s->cd_irq);
    }

    return 0;
}

/* Who to notify on card events */
void pxa2xx_pcmcia_set_irq_cb(void *opaque, qemu_irq irq, qemu_irq cd_irq)
{
    PXA2xxPCMCIAState *s = (PXA2xxPCMCIAState *) opaque;
    s->irq = irq;
    s->cd_irq = cd_irq;
}

static const TypeInfo pxa2xx_pcmcia_type_info = {
    .name = TYPE_PXA2XX_PCMCIA,
    .parent = TYPE_SYS_BUS_DEVICE,
    .instance_size = sizeof(PXA2xxPCMCIAState),
    .instance_init = pxa2xx_pcmcia_initfn,
};

static void pxa2xx_pcmcia_register_types(void)
{
    type_register_static(&pxa2xx_pcmcia_type_info);
}

type_init(pxa2xx_pcmcia_register_types)