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151 lines
3.4 KiB
C
151 lines
3.4 KiB
C
/*
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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_fe_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)
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