LXR qemu/hw/char/lm32

   1/*
   2 *  LatticeMico32 JTAG UART model.
   3 *
   4 *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
   5 *
   6 * This library is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU Lesser General Public
   8 * License as published by the Free Software Foundation; either
   9 * version 2 of the License, or (at your option) any later version.
  10 *
  11 * This library is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 * Lesser General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU Lesser General Public
  17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20#include "qemu/osdep.h"
  21#include "hw/hw.h"
  22#include "hw/sysbus.h"
  23#include "trace.h"
  24#include "chardev/char-fe.h"
  25
  26#include "hw/char/lm32_juart.h"
  27
  28enum {
  29    LM32_JUART_MIN_SAVE_VERSION = 0,
  30    LM32_JUART_CURRENT_SAVE_VERSION = 0,
  31    LM32_JUART_MAX_SAVE_VERSION = 0,
  32};
  33
  34enum {
  35    JTX_FULL = (1<<8),
  36};
  37
  38enum {
  39    JRX_FULL = (1<<8),
  40};
  41
  42#define LM32_JUART(obj) OBJECT_CHECK(LM32JuartState, (obj), TYPE_LM32_JUART)
  43
  44struct LM32JuartState {
  45    SysBusDevice parent_obj;
  46
  47    CharBackend chr;
  48
  49    uint32_t jtx;
  50    uint32_t jrx;
  51};
  52typedef struct LM32JuartState LM32JuartState;
  53
  54uint32_t lm32_juart_get_jtx(DeviceState *d)
  55{
  56    LM32JuartState *s = LM32_JUART(d);
  57
  58    trace_lm32_juart_get_jtx(s->jtx);
  59    return s->jtx;
  60}
  61
  62uint32_t lm32_juart_get_jrx(DeviceState *d)
  63{
  64    LM32JuartState *s = LM32_JUART(d);
  65
  66    trace_lm32_juart_get_jrx(s->jrx);
  67    return s->jrx;
  68}
  69
  70void lm32_juart_set_jtx(DeviceState *d, uint32_t jtx)
  71{
  72    LM32JuartState *s = LM32_JUART(d);
  73    unsigned char ch = jtx & 0xff;
  74
  75    trace_lm32_juart_set_jtx(s->jtx);
  76
  77    s->jtx = jtx;
  78    /* XXX this blocks entire thread. Rewrite to use
  79     * qemu_chr_fe_write and background I/O callbacks */
  80    qemu_chr_fe_write_all(&s->chr, &ch, 1);
  81}
  82
  83void lm32_juart_set_jrx(DeviceState *d, uint32_t jtx)
  84{
  85    LM32JuartState *s = LM32_JUART(d);
  86
  87    trace_lm32_juart_set_jrx(s->jrx);
  88    s->jrx &= ~JRX_FULL;
  89}
  90
  91static void juart_rx(void *opaque, const uint8_t *buf, int size)
  92{
  93    LM32JuartState *s = opaque;
  94
  95    s->jrx = *buf | JRX_FULL;
  96}
  97
  98static int juart_can_rx(void *opaque)
  99{
 100    LM32JuartState *s = opaque;
 101
 102    return !(s->jrx & JRX_FULL);
 103}
 104
 105static void juart_event(void *opaque, int event)
 106{
 107}
 108
 109static void juart_reset(DeviceState *d)
 110{
 111    LM32JuartState *s = LM32_JUART(d);
 112
 113    s->jtx = 0;
 114    s->jrx = 0;
 115}
 116
 117static void lm32_juart_realize(DeviceState *dev, Error **errp)
 118{
 119    LM32JuartState *s = LM32_JUART(dev);
 120
 121    qemu_chr_fe_set_handlers(&s->chr, juart_can_rx, juart_rx,
 122                             juart_event, NULL, s, NULL, true);
 123}
 124
 125static const VMStateDescription vmstate_lm32_juart = {
 126    .name = "lm32-juart",
 127    .version_id = 1,
 128    .minimum_version_id = 1,
 129    .fields = (VMStateField[]) {
 130        VMSTATE_UINT32(jtx, LM32JuartState),
 131        VMSTATE_UINT32(jrx, LM32JuartState),
 132        VMSTATE_END_OF_LIST()
 133    }
 134};
 135
 136static Property lm32_juart_properties[] = {
 137    DEFINE_PROP_CHR("chardev", LM32JuartState, chr),
 138    DEFINE_PROP_END_OF_LIST(),
 139};
 140
 141static void lm32_juart_class_init(ObjectClass *klass, void *data)
 142{
 143    DeviceClass *dc = DEVICE_CLASS(klass);
 144
 145    dc->reset = juart_reset;
 146    dc->vmsd = &vmstate_lm32_juart;
 147    dc->props = lm32_juart_properties;
 148    dc->realize = lm32_juart_realize;
 149}
 150
 151static const TypeInfo lm32_juart_info = {
 152    .name          = TYPE_LM32_JUART,
 153    .parent        = TYPE_SYS_BUS_DEVICE,
 154    .instance_size = sizeof(LM32JuartState),
 155    .class_init    = lm32_juart_class_init,
 156};
 157
 158static void lm32_juart_register_types(void)
 159{
 160    type_register_static(&lm32_juart_info);
 161}
 162
 163type_init(lm32_juart_register_types)
 164