hw/input/milkymist-softusb.c

   1 /*
   2  *  QEMU model of the Milkymist SoftUSB block.
   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  * Specification available at:
  21  *   not available yet
  22  */
  23
  24 #include "qemu/osdep.h"
  25 #include "qapi/error.h"
  26 #include "hw/hw.h"
  27 #include "hw/sysbus.h"
  28 #include "trace.h"
  29 #include "ui/console.h"
  30 #include "hw/input/hid.h"
  31 #include "qemu/error-report.h"
  32
  33 enum {
  34     R_CTRL = 0,
  35     R_MAX
  36 };
  37
  38 enum {
  39     CTRL_RESET = (1<<0),
  40 };
  41
  42 #define COMLOC_DEBUG_PRODUCE 0x1000
  43 #define COMLOC_DEBUG_BASE    0x1001
  44 #define COMLOC_MEVT_PRODUCE  0x1101
  45 #define COMLOC_MEVT_BASE     0x1102
  46 #define COMLOC_KEVT_PRODUCE  0x1142
  47 #define COMLOC_KEVT_BASE     0x1143
  48
  49 #define TYPE_MILKYMIST_SOFTUSB "milkymist-softusb"
  50 #define MILKYMIST_SOFTUSB(obj) \
  51     OBJECT_CHECK(MilkymistSoftUsbState, (obj), TYPE_MILKYMIST_SOFTUSB)
  52
  53 struct MilkymistSoftUsbState {
  54     SysBusDevice parent_obj;
  55
  56     HIDState hid_kbd;
  57     HIDState hid_mouse;
  58
  59     MemoryRegion regs_region;
  60     MemoryRegion pmem;
  61     MemoryRegion dmem;
  62     qemu_irq irq;
  63
  64     void *pmem_ptr;
  65     void *dmem_ptr;
  66
  67     /* device properties */
  68     uint32_t pmem_size;
  69     uint32_t dmem_size;
  70
  71     /* device registers */
  72     uint32_t regs[R_MAX];
  73
  74     /* mouse state */
  75     uint8_t mouse_hid_buffer[4];
  76
  77     /* keyboard state */
  78     uint8_t kbd_hid_buffer[8];
  79 };
  80 typedef struct MilkymistSoftUsbState MilkymistSoftUsbState;
  81
  82 static uint64_t softusb_read(void *opaque, hwaddr addr,
  83                              unsigned size)
  84 {
  85     MilkymistSoftUsbState *s = opaque;
  86     uint32_t r = 0;
  87
  88     addr >>= 2;
  89     switch (addr) {
  90     case R_CTRL:
  91         r = s->regs[addr];
  92         break;
  93
  94     default:
  95         error_report("milkymist_softusb: read access to unknown register 0x"
  96                 TARGET_FMT_plx, addr << 2);
  97         break;
  98     }
  99
 100     trace_milkymist_softusb_memory_read(addr << 2, r);
 101
 102     return r;
 103 }
 104
 105 static void
 106 softusb_write(void *opaque, hwaddr addr, uint64_t value,
 107               unsigned size)
 108 {
 109     MilkymistSoftUsbState *s = opaque;
 110
 111     trace_milkymist_softusb_memory_write(addr, value);
 112
 113     addr >>= 2;
 114     switch (addr) {
 115     case R_CTRL:
 116         s->regs[addr] = value;
 117         break;
 118
 119     default:
 120         error_report("milkymist_softusb: write access to unknown register 0x"
 121                 TARGET_FMT_plx, addr << 2);
 122         break;
 123     }
 124 }
 125
 126 static const MemoryRegionOps softusb_mmio_ops = {
 127     .read = softusb_read,
 128     .write = softusb_write,
 129     .endianness = DEVICE_NATIVE_ENDIAN,
 130     .valid = {
 131         .min_access_size = 4,
 132         .max_access_size = 4,
 133     },
 134 };
 135
 136 static inline void softusb_read_dmem(MilkymistSoftUsbState *s,
 137         uint32_t offset, uint8_t *buf, uint32_t len)
 138 {
 139     if (offset + len >= s->dmem_size) {
 140         error_report("milkymist_softusb: read dmem out of bounds "
 141                 "at offset 0x%x, len %d", offset, len);
 142         memset(buf, 0, len);
 143         return;
 144     }
 145
 146     memcpy(buf, s->dmem_ptr + offset, len);
 147 }
 148
 149 static inline void softusb_write_dmem(MilkymistSoftUsbState *s,
 150         uint32_t offset, uint8_t *buf, uint32_t len)
 151 {
 152     if (offset + len >= s->dmem_size) {
 153         error_report("milkymist_softusb: write dmem out of bounds "
 154                 "at offset 0x%x, len %d", offset, len);
 155         return;
 156     }
 157
 158     memcpy(s->dmem_ptr + offset, buf, len);
 159 }
 160
 161 static void softusb_mouse_changed(MilkymistSoftUsbState *s)
 162 {
 163     uint8_t m;
 164
 165     softusb_read_dmem(s, COMLOC_MEVT_PRODUCE, &m, 1);
 166     trace_milkymist_softusb_mevt(m);
 167     softusb_write_dmem(s, COMLOC_MEVT_BASE + 4 * m, s->mouse_hid_buffer, 4);
 168     m = (m + 1) & 0xf;
 169     softusb_write_dmem(s, COMLOC_MEVT_PRODUCE, &m, 1);
 170
 171     trace_milkymist_softusb_pulse_irq();
 172     qemu_irq_pulse(s->irq);
 173 }
 174
 175 static void softusb_kbd_changed(MilkymistSoftUsbState *s)
 176 {
 177     uint8_t m;
 178
 179     softusb_read_dmem(s, COMLOC_KEVT_PRODUCE, &m, 1);
 180     trace_milkymist_softusb_kevt(m);
 181     softusb_write_dmem(s, COMLOC_KEVT_BASE + 8 * m, s->kbd_hid_buffer, 8);
 182     m = (m + 1) & 0x7;
 183     softusb_write_dmem(s, COMLOC_KEVT_PRODUCE, &m, 1);
 184
 185     trace_milkymist_softusb_pulse_irq();
 186     qemu_irq_pulse(s->irq);
 187 }
 188
 189 static void softusb_kbd_hid_datain(HIDState *hs)
 190 {
 191     MilkymistSoftUsbState *s = container_of(hs, MilkymistSoftUsbState, hid_kbd);
 192     int len;
 193
 194     /* if device is in reset, do nothing */
 195     if (s->regs[R_CTRL] & CTRL_RESET) {
 196         return;
 197     }
 198
 199     while (hid_has_events(hs)) {
 200         len = hid_keyboard_poll(hs, s->kbd_hid_buffer,
 201                 sizeof(s->kbd_hid_buffer));
 202
 203         if (len == 8) {
 204             softusb_kbd_changed(s);
 205         }
 206     }
 207 }
 208
 209 static void softusb_mouse_hid_datain(HIDState *hs)
 210 {
 211     MilkymistSoftUsbState *s =
 212             container_of(hs, MilkymistSoftUsbState, hid_mouse);
 213     int len;
 214
 215     /* if device is in reset, do nothing */
 216     if (s->regs[R_CTRL] & CTRL_RESET) {
 217         return;
 218     }
 219
 220     while (hid_has_events(hs)) {
 221         len = hid_pointer_poll(hs, s->mouse_hid_buffer,
 222                 sizeof(s->mouse_hid_buffer));
 223
 224         if (len == 4) {
 225             softusb_mouse_changed(s);
 226         }
 227     }
 228 }
 229
 230 static void milkymist_softusb_reset(DeviceState *d)
 231 {
 232     MilkymistSoftUsbState *s = MILKYMIST_SOFTUSB(d);
 233     int i;
 234
 235     for (i = 0; i < R_MAX; i++) {
 236         s->regs[i] = 0;
 237     }
 238     memset(s->kbd_hid_buffer, 0, sizeof(s->kbd_hid_buffer));
 239     memset(s->mouse_hid_buffer, 0, sizeof(s->mouse_hid_buffer));
 240
 241     hid_reset(&s->hid_kbd);
 242     hid_reset(&s->hid_mouse);
 243
 244     /* defaults */
 245     s->regs[R_CTRL] = CTRL_RESET;
 246 }
 247
 248 static void milkymist_softusb_realize(DeviceState *dev, Error **errp)
 249 {
 250     MilkymistSoftUsbState *s = MILKYMIST_SOFTUSB(dev);
 251     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 252
 253     sysbus_init_irq(sbd, &s->irq);
 254
 255     memory_region_init_io(&s->regs_region, OBJECT(s), &softusb_mmio_ops, s,
 256                           "milkymist-softusb", R_MAX * 4);
 257     sysbus_init_mmio(sbd, &s->regs_region);
 258
 259     /* register pmem and dmem */
 260     memory_region_init_ram_nomigrate(&s->pmem, OBJECT(s), "milkymist-softusb.pmem",
 261                            s->pmem_size, &error_fatal);
 262     vmstate_register_ram_global(&s->pmem);
 263     s->pmem_ptr = memory_region_get_ram_ptr(&s->pmem);
 264     sysbus_init_mmio(sbd, &s->pmem);
 265     memory_region_init_ram_nomigrate(&s->dmem, OBJECT(s), "milkymist-softusb.dmem",
 266                            s->dmem_size, &error_fatal);
 267     vmstate_register_ram_global(&s->dmem);
 268     s->dmem_ptr = memory_region_get_ram_ptr(&s->dmem);
 269     sysbus_init_mmio(sbd, &s->dmem);
 270
 271     hid_init(&s->hid_kbd, HID_KEYBOARD, softusb_kbd_hid_datain);
 272     hid_init(&s->hid_mouse, HID_MOUSE, softusb_mouse_hid_datain);
 273 }
 274
 275 static const VMStateDescription vmstate_milkymist_softusb = {
 276     .name = "milkymist-softusb",
 277     .version_id = 1,
 278     .minimum_version_id = 1,
 279     .fields = (VMStateField[]) {
 280         VMSTATE_UINT32_ARRAY(regs, MilkymistSoftUsbState, R_MAX),
 281         VMSTATE_HID_KEYBOARD_DEVICE(hid_kbd, MilkymistSoftUsbState),
 282         VMSTATE_HID_POINTER_DEVICE(hid_mouse, MilkymistSoftUsbState),
 283         VMSTATE_BUFFER(kbd_hid_buffer, MilkymistSoftUsbState),
 284         VMSTATE_BUFFER(mouse_hid_buffer, MilkymistSoftUsbState),
 285         VMSTATE_END_OF_LIST()
 286     }
 287 };
 288
 289 static Property milkymist_softusb_properties[] = {
 290     DEFINE_PROP_UINT32("pmem_size", MilkymistSoftUsbState, pmem_size, 0x00001000),
 291     DEFINE_PROP_UINT32("dmem_size", MilkymistSoftUsbState, dmem_size, 0x00002000),
 292     DEFINE_PROP_END_OF_LIST(),
 293 };
 294
 295 static void milkymist_softusb_class_init(ObjectClass *klass, void *data)
 296 {
 297     DeviceClass *dc = DEVICE_CLASS(klass);
 298
 299     dc->realize = milkymist_softusb_realize;
 300     dc->reset = milkymist_softusb_reset;
 301     dc->vmsd = &vmstate_milkymist_softusb;
 302     dc->props = milkymist_softusb_properties;
 303 }
 304
 305 static const TypeInfo milkymist_softusb_info = {
 306     .name          = TYPE_MILKYMIST_SOFTUSB,
 307     .parent        = TYPE_SYS_BUS_DEVICE,
 308     .instance_size = sizeof(MilkymistSoftUsbState),
 309     .class_init    = milkymist_softusb_class_init,
 310 };
 311
 312 static void milkymist_softusb_register_types(void)
 313 {
 314     type_register_static(&milkymist_softusb_info);
 315 }
 316
 317 type_init(milkymist_softusb_register_types)