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 2.1 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/sysbus.h"
  22#include "migration/vmstate.h"
  23#include "qemu/module.h"
  24#include "trace.h"
  25#include "chardev/char-fe.h"
  26
  27#include "hw/char/lm32_juart.h"
  28#include "hw/qdev-properties.h"
  29#include "qom/object.h"
  30
  31enum {
  32    LM32_JUART_MIN_SAVE_VERSION = 0,
  33    LM32_JUART_CURRENT_SAVE_VERSION = 0,
  34    LM32_JUART_MAX_SAVE_VERSION = 0,
  35};
  36
  37enum {
  38    JTX_FULL = (1<<8),
  39};
  40
  41enum {
  42    JRX_FULL = (1<<8),
  43};
  44
  45OBJECT_DECLARE_SIMPLE_TYPE(LM32JuartState, LM32_JUART)
  46
  47struct LM32JuartState {
  48    SysBusDevice parent_obj;
  49
  50    CharBackend chr;
  51
  52    uint32_t jtx;
  53    uint32_t jrx;
  54};
  55
  56uint32_t lm32_juart_get_jtx(DeviceState *d)
  57{
  58    LM32JuartState *s = LM32_JUART(d);
  59
  60    trace_lm32_juart_get_jtx(s->jtx);
  61    return s->jtx;
  62}
  63
  64uint32_t lm32_juart_get_jrx(DeviceState *d)
  65{
  66    LM32JuartState *s = LM32_JUART(d);
  67
  68    trace_lm32_juart_get_jrx(s->jrx);
  69    return s->jrx;
  70}
  71
  72void lm32_juart_set_jtx(DeviceState *d, uint32_t jtx)
  73{
  74    LM32JuartState *s = LM32_JUART(d);
  75    unsigned char ch = jtx & 0xff;
  76
  77    trace_lm32_juart_set_jtx(s->jtx);
  78
  79    s->jtx = jtx;
  80    /* XXX this blocks entire thread. Rewrite to use
  81     * qemu_chr_fe_write and background I/O callbacks */
  82    qemu_chr_fe_write_all(&s->chr, &ch, 1);
  83}
  84
  85void lm32_juart_set_jrx(DeviceState *d, uint32_t jtx)
  86{
  87    LM32JuartState *s = LM32_JUART(d);
  88
  89    trace_lm32_juart_set_jrx(s->jrx);
  90    s->jrx &= ~JRX_FULL;
  91}
  92
  93static void juart_rx(void *opaque, const uint8_t *buf, int size)
  94{
  95    LM32JuartState *s = opaque;
  96
  97    s->jrx = *buf | JRX_FULL;
  98}
  99
 100static int juart_can_rx(void *opaque)
 101{
 102    LM32JuartState *s = opaque;
 103
 104    return !(s->jrx & JRX_FULL);
 105}
 106
 107static void juart_event(void *opaque, QEMUChrEvent event)
 108{
 109}
 110
 111static void juart_reset(DeviceState *d)
 112{
 113    LM32JuartState *s = LM32_JUART(d);
 114
 115    s->jtx = 0;
 116    s->jrx = 0;
 117}
 118
 119static void lm32_juart_realize(DeviceState *dev, Error **errp)
 120{
 121    LM32JuartState *s = LM32_JUART(dev);
 122
 123    qemu_chr_fe_set_handlers(&s->chr, juart_can_rx, juart_rx,
 124                             juart_event, NULL, s, NULL, true);
 125}
 126
 127static const VMStateDescription vmstate_lm32_juart = {
 128    .name = "lm32-juart",
 129    .version_id = 1,
 130    .minimum_version_id = 1,
 131    .fields = (VMStateField[]) {
 132        VMSTATE_UINT32(jtx, LM32JuartState),
 133        VMSTATE_UINT32(jrx, LM32JuartState),
 134        VMSTATE_END_OF_LIST()
 135    }
 136};
 137
 138static Property lm32_juart_properties[] = {
 139    DEFINE_PROP_CHR("chardev", LM32JuartState, chr),
 140    DEFINE_PROP_END_OF_LIST(),
 141};
 142
 143static void lm32_juart_class_init(ObjectClass *klass, void *data)
 144{
 145    DeviceClass *dc = DEVICE_CLASS(klass);
 146
 147    dc->reset = juart_reset;
 148    dc->vmsd = &vmstate_lm32_juart;
 149    device_class_set_props(dc, lm32_juart_properties);
 150    dc->realize = lm32_juart_realize;
 151}
 152
 153static const TypeInfo lm32_juart_info = {
 154    .name          = TYPE_LM32_JUART,
 155    .parent        = TYPE_SYS_BUS_DEVICE,
 156    .instance_size = sizeof(LM32JuartState),
 157    .class_init    = lm32_juart_class_init,
 158};
 159
 160static void lm32_juart_register_types(void)
 161{
 162    type_register_static(&lm32_juart_info);
 163}
 164
 165type_init(lm32_juart_register_types)
 166