#include "qemu/osdep.h"
#include "hw/core/sysbus.h"
#include "qemu/log.h"
#include "qom/object.h"

#define TYPE_S5L8950X_CHIPID "s5l8950x-chipid"
OBJECT_DECLARE_SIMPLE_TYPE(S5L8950XChipIdState, S5L8950X_CHIPID)

struct S5L8950XChipIdState {
    SysBusDevice parent_obj;
    MemoryRegion iomem;
};

static uint64_t s5l8950x_chipid_read(void *opaque, hwaddr offset, unsigned size)
{
    switch (offset) {
    case 0x00:
        /* n41ap: CPFM 0x03, SCEP 0x10, BDID 0x00, IBFL 0x00. */
        return 0x200D;
    case 0x04:
        /*
         * SecureROM leaves the high handoff bit asserted before entering
         * iBSS.  Early iBoot aborts immediately when this latch is clear.
         */
        return 0x80000000;
    case 0x08:
        return 0xDEADBEEF;
    case 0x0C:
        return 0xCAFEBABE;
    case 0x10:
        return 0x1;
    case 0x14:
        return 0x1;
    case 0x18:
        return 0x1;
    case 0x1C:
        return 0x0;
    case 0x20:
        return 0x1;
    case 0x24:
        /* CPRV 0x20.  Also contributes to the synthetic ECID. */
        return 0x4000;
    default:
        return 0;
    }
}

static void s5l8950x_chipid_write(void *opaque, hwaddr offset,
                                  uint64_t val, unsigned size)
{
    qemu_log_mask(LOG_UNIMP, "%s: Unimplemented write to offset 0x%" HWADDR_PRIx
                  " with value 0x%" PRIx64 "\n", __func__, offset, val);
}

static const MemoryRegionOps s5l8950x_chipid_ops = {
    .read = s5l8950x_chipid_read,
    .write = s5l8950x_chipid_write,
    .endianness = DEVICE_LITTLE_ENDIAN,
    .impl = {
        .min_access_size = 4,
        .max_access_size = 4,
    },
};

static void s5l8950x_chipid_init(Object *obj)
{
    S5L8950XChipIdState *s = S5L8950X_CHIPID(obj);
    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);

    memory_region_init_io(&s->iomem, obj, &s5l8950x_chipid_ops, s,
                          TYPE_S5L8950X_CHIPID, 0x100);
    sysbus_init_mmio(sbd, &s->iomem);
}

static const TypeInfo s5l8950x_chipid_info = {
    .name          = TYPE_S5L8950X_CHIPID,
    .parent        = TYPE_SYS_BUS_DEVICE,
    .instance_size = sizeof(S5L8950XChipIdState),
    .instance_init = s5l8950x_chipid_init,
};

static void s5l8950x_chipid_register_types(void)
{
    type_register_static(&s5l8950x_chipid_info);
}

type_init(s5l8950x_chipid_register_types)