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