diff options
Diffstat (limited to 'src/hw/char/lm32_juart.c')
| -rw-r--r-- | src/hw/char/lm32_juart.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/src/hw/char/lm32_juart.c b/src/hw/char/lm32_juart.c new file mode 100644 index 0000000..62763f2 --- /dev/null +++ b/src/hw/char/lm32_juart.c @@ -0,0 +1,164 @@ +/* + * 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/hw.h" +#include "hw/sysbus.h" +#include "trace.h" +#include "sysemu/char.h" + +#include "hw/char/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), +}; + +#define LM32_JUART(obj) OBJECT_CHECK(LM32JuartState, (obj), TYPE_LM32_JUART) + +struct LM32JuartState { + SysBusDevice parent_obj; + + CharDriverState *chr; + + uint32_t jtx; + uint32_t jrx; +}; +typedef struct LM32JuartState LM32JuartState; + +uint32_t lm32_juart_get_jtx(DeviceState *d) +{ + LM32JuartState *s = LM32_JUART(d); + + trace_lm32_juart_get_jtx(s->jtx); + return s->jtx; +} + +uint32_t lm32_juart_get_jrx(DeviceState *d) +{ + LM32JuartState *s = LM32_JUART(d); + + trace_lm32_juart_get_jrx(s->jrx); + return s->jrx; +} + +void lm32_juart_set_jtx(DeviceState *d, uint32_t jtx) +{ + LM32JuartState *s = LM32_JUART(d); + unsigned char ch = jtx & 0xff; + + trace_lm32_juart_set_jtx(s->jtx); + + s->jtx = jtx; + if (s->chr) { + qemu_chr_fe_write_all(s->chr, &ch, 1); + } +} + +void lm32_juart_set_jrx(DeviceState *d, uint32_t jtx) +{ + LM32JuartState *s = LM32_JUART(d); + + 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 = LM32_JUART(d); + + s->jtx = 0; + s->jrx = 0; +} + +static int lm32_juart_init(SysBusDevice *dev) +{ + LM32JuartState *s = LM32_JUART(dev); + + /* FIXME use a qdev chardev prop instead of qemu_char_get_next_serial() */ + s->chr = qemu_char_get_next_serial(); + 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, + .fields = (VMStateField[]) { + VMSTATE_UINT32(jtx, LM32JuartState), + VMSTATE_UINT32(jrx, LM32JuartState), + VMSTATE_END_OF_LIST() + } +}; + +static void lm32_juart_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); + + k->init = lm32_juart_init; + dc->reset = juart_reset; + dc->vmsd = &vmstate_lm32_juart; + /* Reason: init() method uses qemu_char_get_next_serial() */ + dc->cannot_instantiate_with_device_add_yet = true; +} + +static const TypeInfo lm32_juart_info = { + .name = TYPE_LM32_JUART, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(LM32JuartState), + .class_init = lm32_juart_class_init, +}; + +static void lm32_juart_register_types(void) +{ + type_register_static(&lm32_juart_info); +} + +type_init(lm32_juart_register_types) |
