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 "hw/hw.h"
  21#include "hw/sysbus.h"
  22#include "trace.h"
  23#include "sysemu/char.h"
  24
  25#include "hw/char/lm32_juart.h"
  26
  27enum {
  28    LM32_JUART_MIN_SAVE_VERSION = 0,
  29    LM32_JUART_CURRENT_SAVE_VERSION = 0,
  30    LM32_JUART_MAX_SAVE_VERSION = 0,
  31};
  32
  33enum {
  34    JTX_FULL = (1<<8),
  35};
  36
  37enum {
  38    JRX_FULL = (1<<8),
  39};
  40
  41#define LM32_JUART(obj) OBJECT_CHECK(LM32JuartState, (obj), TYPE_LM32_JUART)
  42
  43struct LM32JuartState {
  44    SysBusDevice parent_obj;
  45
  46    CharDriverState *chr;
  47
  48    uint32_t jtx;
  49    uint32_t jrx;
  50};
  51typedef struct LM32JuartState LM32JuartState;
  52
  53uint32_t lm32_juart_get_jtx(DeviceState *d)
  54{
  55    LM32JuartState *s = LM32_JUART(d);
  56
  57    trace_lm32_juart_get_jtx(s->jtx);
  58    return s->jtx;
  59}
  60
  61uint32_t lm32_juart_get_jrx(DeviceState *d)
  62{
  63    LM32JuartState *s = LM32_JUART(d);
  64
  65    trace_lm32_juart_get_jrx(s->jrx);
  66    return s->jrx;
  67}
  68
  69void lm32_juart_set_jtx(DeviceState *d, uint32_t jtx)
  70{
  71    LM32JuartState *s = LM32_JUART(d);
  72    unsigned char ch = jtx & 0xff;
  73
  74    trace_lm32_juart_set_jtx(s->jtx);
  75
  76    s->jtx = jtx;
  77    if (s->chr) {
  78        qemu_chr_fe_write(s->chr, &ch, 1);
  79    }
  80}
  81
  82void lm32_juart_set_jrx(DeviceState *d, uint32_t jtx)
  83{
  84    LM32JuartState *s = LM32_JUART(d);
  85
  86    trace_lm32_juart_set_jrx(s->jrx);
  87    s->jrx &= ~JRX_FULL;
  88}
  89
  90static void juart_rx(void *opaque, const uint8_t *buf, int size)
  91{
  92    LM32JuartState *s = opaque;
  93
  94    s->jrx = *buf | JRX_FULL;
  95}
  96
  97static int juart_can_rx(void *opaque)
  98{
  99    LM32JuartState *s = opaque;
 100
 101    return !(s->jrx & JRX_FULL);
 102}
 103
 104static void juart_event(void *opaque, int event)
 105{
 106}
 107
 108static void juart_reset(DeviceState *d)
 109{
 110    LM32JuartState *s = LM32_JUART(d);
 111
 112    s->jtx = 0;
 113    s->jrx = 0;
 114}
 115
 116static int lm32_juart_init(SysBusDevice *dev)
 117{
 118    LM32JuartState *s = LM32_JUART(dev);
 119
 120    s->chr = qemu_char_get_next_serial();
 121    if (s->chr) {
 122        qemu_chr_add_handlers(s->chr, juart_can_rx, juart_rx, juart_event, s);
 123    }
 124
 125    return 0;
 126}
 127
 128static const VMStateDescription vmstate_lm32_juart = {
 129    .name = "lm32-juart",
 130    .version_id = 1,
 131    .minimum_version_id = 1,
 132    .minimum_version_id_old = 1,
 133    .fields      = (VMStateField[]) {
 134        VMSTATE_UINT32(jtx, LM32JuartState),
 135        VMSTATE_UINT32(jrx, LM32JuartState),
 136        VMSTATE_END_OF_LIST()
 137    }
 138};
 139
 140static void lm32_juart_class_init(ObjectClass *klass, void *data)
 141{
 142    DeviceClass *dc = DEVICE_CLASS(klass);
 143    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 144
 145    k->init = lm32_juart_init;
 146    dc->reset = juart_reset;
 147    dc->vmsd = &vmstate_lm32_juart;
 148}
 149
 150static const TypeInfo lm32_juart_info = {
 151    .name          = TYPE_LM32_JUART,
 152    .parent        = TYPE_SYS_BUS_DEVICE,
 153    .instance_size = sizeof(LM32JuartState),
 154    .class_init    = lm32_juart_class_init,
 155};
 156
 157static void lm32_juart_register_types(void)
 158{
 159    type_register_static(&lm32_juart_info);
 160}
 161
 162type_init(lm32_juart_register_types)
 163