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/*
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 *  LatticeMico32 JTAG UART model.
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 *
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 *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
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 */
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#include "hw.h"
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#include "sysbus.h"
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#include "trace.h"
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#include "qemu-char.h"
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#include "lm32_juart.h"
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enum {
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    LM32_JUART_MIN_SAVE_VERSION = 0,
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    LM32_JUART_CURRENT_SAVE_VERSION = 0,
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    LM32_JUART_MAX_SAVE_VERSION = 0,
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};
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enum {
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    JTX_FULL = (1<<8),
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};
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enum {
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    JRX_FULL = (1<<8),
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};
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struct LM32JuartState {
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    SysBusDevice busdev;
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    CharDriverState *chr;
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    uint32_t jtx;
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    uint32_t jrx;
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};
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typedef struct LM32JuartState LM32JuartState;
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uint32_t lm32_juart_get_jtx(DeviceState *d)
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{
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    LM32JuartState *s = container_of(d, LM32JuartState, busdev.qdev);
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    trace_lm32_juart_get_jtx(s->jtx);
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    return s->jtx;
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}
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uint32_t lm32_juart_get_jrx(DeviceState *d)
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{
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    LM32JuartState *s = container_of(d, LM32JuartState, busdev.qdev);
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    trace_lm32_juart_get_jrx(s->jrx);
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    return s->jrx;
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}
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void lm32_juart_set_jtx(DeviceState *d, uint32_t jtx)
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{
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    LM32JuartState *s = container_of(d, LM32JuartState, busdev.qdev);
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    unsigned char ch = jtx & 0xff;
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    trace_lm32_juart_set_jtx(s->jtx);
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    s->jtx = jtx;
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    if (s->chr) {
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        qemu_chr_write(s->chr, &ch, 1);
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    }
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}
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void lm32_juart_set_jrx(DeviceState *d, uint32_t jtx)
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{
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    LM32JuartState *s = container_of(d, LM32JuartState, busdev.qdev);
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    trace_lm32_juart_set_jrx(s->jrx);
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    s->jrx &= ~JRX_FULL;
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}
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static void juart_rx(void *opaque, const uint8_t *buf, int size)
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{
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    LM32JuartState *s = opaque;
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    s->jrx = *buf | JRX_FULL;
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}
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static int juart_can_rx(void *opaque)
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{
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    LM32JuartState *s = opaque;
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    return !(s->jrx & JRX_FULL);
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}
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static void juart_event(void *opaque, int event)
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{
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}
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static void juart_reset(DeviceState *d)
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{
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    LM32JuartState *s = container_of(d, LM32JuartState, busdev.qdev);
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    s->jtx = 0;
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    s->jrx = 0;
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}
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static int lm32_juart_init(SysBusDevice *dev)
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{
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    LM32JuartState *s = FROM_SYSBUS(typeof(*s), dev);
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    s->chr = qdev_init_chardev(&dev->qdev);
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    if (s->chr) {
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        qemu_chr_add_handlers(s->chr, juart_can_rx, juart_rx, juart_event, s);
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    }
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    return 0;
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}
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static const VMStateDescription vmstate_lm32_juart = {
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    .name = "lm32-juart",
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    .version_id = 1,
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    .minimum_version_id = 1,
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    .minimum_version_id_old = 1,
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    .fields      = (VMStateField[]) {
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        VMSTATE_UINT32(jtx, LM32JuartState),
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        VMSTATE_UINT32(jrx, LM32JuartState),
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        VMSTATE_END_OF_LIST()
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    }
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};
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static SysBusDeviceInfo lm32_juart_info = {
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    .init = lm32_juart_init,
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    .qdev.name  = "lm32-juart",
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    .qdev.size  = sizeof(LM32JuartState),
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    .qdev.vmsd  = &vmstate_lm32_juart,
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    .qdev.reset = juart_reset,
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};
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static void lm32_juart_register(void)
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{
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    sysbus_register_withprop(&lm32_juart_info);
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}
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device_init(lm32_juart_register)