/* * 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_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)