hw/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 "hw.h"
  25 #include "sysbus.h"
  26 #include "trace.h"
  27 #include "console.h"
  28 #include "hid.h"
  29 #include "qemu-error.h"
  30
  31 enum {
  32     R_CTRL = 0,
  33     R_MAX
  34 };
  35
  36 enum {
  37     CTRL_RESET = (1<<0),
  38 };
  39
  40 #define COMLOC_DEBUG_PRODUCE 0x1000
  41 #define COMLOC_DEBUG_BASE    0x1001
  42 #define COMLOC_MEVT_PRODUCE  0x1101
  43 #define COMLOC_MEVT_BASE     0x1102
  44 #define COMLOC_KEVT_PRODUCE  0x1142
  45 #define COMLOC_KEVT_BASE     0x1143
  46
  47 struct MilkymistSoftUsbState {
  48     SysBusDevice busdev;
  49     HIDState hid_kbd;
  50     HIDState hid_mouse;
  51
  52     MemoryRegion regs_region;
  53     MemoryRegion pmem;
  54     MemoryRegion dmem;
  55     qemu_irq irq;
  56
  57     /* device properties */
  58     uint32_t pmem_base;
  59     uint32_t pmem_size;
  60     uint32_t dmem_base;
  61     uint32_t dmem_size;
  62
  63     /* device registers */
  64     uint32_t regs[R_MAX];
  65
  66     /* mouse state */
  67     uint8_t mouse_hid_buffer[4];
  68
  69     /* keyboard state */
  70     uint8_t kbd_hid_buffer[8];
  71 };
  72 typedef struct MilkymistSoftUsbState MilkymistSoftUsbState;
  73
  74 static uint64_t softusb_read(void *opaque, target_phys_addr_t addr,
  75                              unsigned size)
  76 {
  77     MilkymistSoftUsbState *s = opaque;
  78     uint32_t r = 0;
  79
  80     addr >>= 2;
  81     switch (addr) {
  82     case R_CTRL:
  83         r = s->regs[addr];
  84         break;
  85
  86     default:
  87         error_report("milkymist_softusb: read access to unknown register 0x"
  88                 TARGET_FMT_plx, addr << 2);
  89         break;
  90     }
  91
  92     trace_milkymist_softusb_memory_read(addr << 2, r);
  93
  94     return r;
  95 }
  96
  97 static void
  98 softusb_write(void *opaque, target_phys_addr_t addr, uint64_t value,
  99               unsigned size)
 100 {
 101     MilkymistSoftUsbState *s = opaque;
 102
 103     trace_milkymist_softusb_memory_write(addr, value);
 104
 105     addr >>= 2;
 106     switch (addr) {
 107     case R_CTRL:
 108         s->regs[addr] = value;
 109         break;
 110
 111     default:
 112         error_report("milkymist_softusb: write access to unknown register 0x"
 113                 TARGET_FMT_plx, addr << 2);
 114         break;
 115     }
 116 }
 117
 118 static const MemoryRegionOps softusb_mmio_ops = {
 119     .read = softusb_read,
 120     .write = softusb_write,
 121     .endianness = DEVICE_NATIVE_ENDIAN,
 122     .valid = {
 123         .min_access_size = 4,
 124         .max_access_size = 4,
 125     },
 126 };
 127
 128 static inline void softusb_read_dmem(MilkymistSoftUsbState *s,
 129         uint32_t offset, uint8_t *buf, uint32_t len)
 130 {
 131     if (offset + len >= s->dmem_size) {
 132         error_report("milkymist_softusb: read dmem out of bounds "
 133                 "at offset 0x%x, len %d", offset, len);
 134         return;
 135     }
 136
 137     cpu_physical_memory_read(s->dmem_base + offset, buf, len);
 138 }
 139
 140 static inline void softusb_write_dmem(MilkymistSoftUsbState *s,
 141         uint32_t offset, uint8_t *buf, uint32_t len)
 142 {
 143     if (offset + len >= s->dmem_size) {
 144         error_report("milkymist_softusb: write dmem out of bounds "
 145                 "at offset 0x%x, len %d", offset, len);
 146         return;
 147     }
 148
 149     cpu_physical_memory_write(s->dmem_base + offset, buf, len);
 150 }
 151
 152 static inline void softusb_read_pmem(MilkymistSoftUsbState *s,
 153         uint32_t offset, uint8_t *buf, uint32_t len)
 154 {
 155     if (offset + len >= s->pmem_size) {
 156         error_report("milkymist_softusb: read pmem out of bounds "
 157                 "at offset 0x%x, len %d", offset, len);
 158         return;
 159     }
 160
 161     cpu_physical_memory_read(s->pmem_base + offset, buf, len);
 162 }
 163
 164 static inline void softusb_write_pmem(MilkymistSoftUsbState *s,
 165         uint32_t offset, uint8_t *buf, uint32_t len)
 166 {
 167     if (offset + len >= s->pmem_size) {
 168         error_report("milkymist_softusb: write pmem out of bounds "
 169                 "at offset 0x%x, len %d", offset, len);
 170         return;
 171     }
 172
 173     cpu_physical_memory_write(s->pmem_base + offset, buf, len);
 174 }
 175
 176 static void softusb_mouse_changed(MilkymistSoftUsbState *s)
 177 {
 178     uint8_t m;
 179
 180     softusb_read_dmem(s, COMLOC_MEVT_PRODUCE, &m, 1);
 181     trace_milkymist_softusb_mevt(m);
 182     softusb_write_dmem(s, COMLOC_MEVT_BASE + 4 * m, s->mouse_hid_buffer, 4);
 183     m = (m + 1) & 0xf;
 184     softusb_write_dmem(s, COMLOC_MEVT_PRODUCE, &m, 1);
 185
 186     trace_milkymist_softusb_pulse_irq();
 187     qemu_irq_pulse(s->irq);
 188 }
 189
 190 static void softusb_kbd_changed(MilkymistSoftUsbState *s)
 191 {
 192     uint8_t m;
 193
 194     softusb_read_dmem(s, COMLOC_KEVT_PRODUCE, &m, 1);
 195     trace_milkymist_softusb_kevt(m);
 196     softusb_write_dmem(s, COMLOC_KEVT_BASE + 8 * m, s->kbd_hid_buffer, 8);
 197     m = (m + 1) & 0x7;
 198     softusb_write_dmem(s, COMLOC_KEVT_PRODUCE, &m, 1);
 199
 200     trace_milkymist_softusb_pulse_irq();
 201     qemu_irq_pulse(s->irq);
 202 }
 203
 204 static void softusb_kbd_hid_datain(HIDState *hs)
 205 {
 206     MilkymistSoftUsbState *s = container_of(hs, MilkymistSoftUsbState, hid_kbd);
 207     int len;
 208
 209     /* if device is in reset, do nothing */
 210     if (s->regs[R_CTRL] & CTRL_RESET) {
 211         return;
 212     }
 213
 214     len = hid_keyboard_poll(hs, s->kbd_hid_buffer, sizeof(s->kbd_hid_buffer));
 215
 216     if (len == 8) {
 217         softusb_kbd_changed(s);
 218     }
 219 }
 220
 221 static void softusb_mouse_hid_datain(HIDState *hs)
 222 {
 223     MilkymistSoftUsbState *s =
 224             container_of(hs, MilkymistSoftUsbState, hid_mouse);
 225     int len;
 226
 227     /* if device is in reset, do nothing */
 228     if (s->regs[R_CTRL] & CTRL_RESET) {
 229         return;
 230     }
 231
 232     len = hid_pointer_poll(hs, s->mouse_hid_buffer,
 233             sizeof(s->mouse_hid_buffer));
 234
 235     if (len == 4) {
 236         softusb_mouse_changed(s);
 237     }
 238 }
 239
 240 static void milkymist_softusb_reset(DeviceState *d)
 241 {
 242     MilkymistSoftUsbState *s =
 243             container_of(d, MilkymistSoftUsbState, busdev.qdev);
 244     int i;
 245
 246     for (i = 0; i < R_MAX; i++) {
 247         s->regs[i] = 0;
 248     }
 249     memset(s->kbd_hid_buffer, 0, sizeof(s->kbd_hid_buffer));
 250     memset(s->mouse_hid_buffer, 0, sizeof(s->mouse_hid_buffer));
 251
 252     hid_reset(&s->hid_kbd);
 253     hid_reset(&s->hid_mouse);
 254
 255     /* defaults */
 256     s->regs[R_CTRL] = CTRL_RESET;
 257 }
 258
 259 static int milkymist_softusb_init(SysBusDevice *dev)
 260 {
 261     MilkymistSoftUsbState *s = FROM_SYSBUS(typeof(*s), dev);
 262
 263     sysbus_init_irq(dev, &s->irq);
 264
 265     memory_region_init_io(&s->regs_region, &softusb_mmio_ops, s,
 266                           "milkymist-softusb", R_MAX * 4);
 267     sysbus_init_mmio(dev, &s->regs_region);
 268
 269     /* register pmem and dmem */
 270     memory_region_init_ram(&s->pmem, NULL, "milkymist-softusb.pmem",
 271                            s->pmem_size);
 272     sysbus_add_memory(dev, s->pmem_base, &s->pmem);
 273     memory_region_init_ram(&s->dmem, NULL, "milkymist-softusb.dmem",
 274                            s->dmem_size);
 275     sysbus_add_memory(dev, s->dmem_base, &s->dmem);
 276
 277     hid_init(&s->hid_kbd, HID_KEYBOARD, softusb_kbd_hid_datain);
 278     hid_init(&s->hid_mouse, HID_MOUSE, softusb_mouse_hid_datain);
 279
 280     return 0;
 281 }
 282
 283 static const VMStateDescription vmstate_milkymist_softusb = {
 284     .name = "milkymist-softusb",
 285     .version_id = 1,
 286     .minimum_version_id = 1,
 287     .minimum_version_id_old = 1,
 288     .fields      = (VMStateField[]) {
 289         VMSTATE_UINT32_ARRAY(regs, MilkymistSoftUsbState, R_MAX),
 290         VMSTATE_HID_KEYBOARD_DEVICE(hid_kbd, MilkymistSoftUsbState),
 291         VMSTATE_HID_POINTER_DEVICE(hid_mouse, MilkymistSoftUsbState),
 292         VMSTATE_BUFFER(kbd_hid_buffer, MilkymistSoftUsbState),
 293         VMSTATE_BUFFER(mouse_hid_buffer, MilkymistSoftUsbState),
 294         VMSTATE_END_OF_LIST()
 295     }
 296 };
 297
 298 static SysBusDeviceInfo milkymist_softusb_info = {
 299     .init = milkymist_softusb_init,
 300     .qdev.name  = "milkymist-softusb",
 301     .qdev.size  = sizeof(MilkymistSoftUsbState),
 302     .qdev.vmsd  = &vmstate_milkymist_softusb,
 303     .qdev.reset = milkymist_softusb_reset,
 304     .qdev.props = (Property[]) {
 305         DEFINE_PROP_UINT32(
 306                 "pmem_base", MilkymistSoftUsbState, pmem_base, 0xa0000000
 307         ),
 308         DEFINE_PROP_UINT32(
 309                 "pmem_size", MilkymistSoftUsbState, pmem_size, 0x00001000
 310         ),
 311         DEFINE_PROP_UINT32(
 312                 "dmem_base", MilkymistSoftUsbState, dmem_base, 0xa0020000
 313         ),
 314         DEFINE_PROP_UINT32(
 315                 "dmem_size", MilkymistSoftUsbState, dmem_size, 0x00002000
 316         ),
 317         DEFINE_PROP_END_OF_LIST(),
 318     }
 319 };
 320
 321 static void milkymist_softusb_register(void)
 322 {
 323     sysbus_register_withprop(&milkymist_softusb_info);
 324 }
 325
 326 device_init(milkymist_softusb_register)