hw/syborg_virtio.c

   1 /*
   2  * Virtio Syborg bindings
   3  *
   4  * Copyright (c) 2009 CodeSourcery
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "syborg.h"
  26 #include "sysbus.h"
  27 #include "virtio.h"
  28 #include "virtio-net.h"
  29 #include "sysemu.h"
  30
  31 //#define DEBUG_SYBORG_VIRTIO
  32
  33 #ifdef DEBUG_SYBORG_VIRTIO
  34 #define DPRINTF(fmt, ...) \
  35 do { printf("syborg_virtio: " fmt , ## __VA_ARGS__); } while (0)
  36 #define BADF(fmt, ...) \
  37 do { fprintf(stderr, "syborg_virtio: error: " fmt , ## __VA_ARGS__); \
  38     exit(1);} while (0)
  39 #else
  40 #define DPRINTF(fmt, ...) do {} while(0)
  41 #define BADF(fmt, ...) \
  42 do { fprintf(stderr, "syborg_virtio: error: " fmt , ## __VA_ARGS__);} while (0)
  43 #endif
  44
  45 enum {
  46     SYBORG_VIRTIO_ID             = 0,
  47     SYBORG_VIRTIO_DEVTYPE        = 1,
  48     SYBORG_VIRTIO_HOST_FEATURES  = 2,
  49     SYBORG_VIRTIO_GUEST_FEATURES = 3,
  50     SYBORG_VIRTIO_QUEUE_BASE     = 4,
  51     SYBORG_VIRTIO_QUEUE_NUM      = 5,
  52     SYBORG_VIRTIO_QUEUE_SEL      = 6,
  53     SYBORG_VIRTIO_QUEUE_NOTIFY   = 7,
  54     SYBORG_VIRTIO_STATUS         = 8,
  55     SYBORG_VIRTIO_INT_ENABLE     = 9,
  56     SYBORG_VIRTIO_INT_STATUS     = 10
  57 };
  58
  59 #define SYBORG_VIRTIO_CONFIG 0x100
  60
  61 /* Device independent interface.  */
  62
  63 typedef struct {
  64     SysBusDevice busdev;
  65     VirtIODevice *vdev;
  66     qemu_irq irq;
  67     uint32_t int_enable;
  68     uint32_t id;
  69     NICConf nic;
  70     uint32_t host_features;
  71     virtio_net_conf net;
  72 } SyborgVirtIOProxy;
  73
  74 static uint32_t syborg_virtio_readl(void *opaque, target_phys_addr_t offset)
  75 {
  76     SyborgVirtIOProxy *s = opaque;
  77     VirtIODevice *vdev = s->vdev;
  78     uint32_t ret;
  79
  80     DPRINTF("readl 0x%x\n", (int)offset);
  81     if (offset >= SYBORG_VIRTIO_CONFIG) {
  82         return virtio_config_readl(vdev, offset - SYBORG_VIRTIO_CONFIG);
  83     }
  84     switch(offset >> 2) {
  85     case SYBORG_VIRTIO_ID:
  86         ret = SYBORG_ID_VIRTIO;
  87         break;
  88     case SYBORG_VIRTIO_DEVTYPE:
  89         ret = s->id;
  90         break;
  91     case SYBORG_VIRTIO_HOST_FEATURES:
  92         ret = s->host_features;
  93         break;
  94     case SYBORG_VIRTIO_GUEST_FEATURES:
  95         ret = vdev->guest_features;
  96         break;
  97     case SYBORG_VIRTIO_QUEUE_BASE:
  98         ret = virtio_queue_get_addr(vdev, vdev->queue_sel);
  99         break;
 100     case SYBORG_VIRTIO_QUEUE_NUM:
 101         ret = virtio_queue_get_num(vdev, vdev->queue_sel);
 102         break;
 103     case SYBORG_VIRTIO_QUEUE_SEL:
 104         ret = vdev->queue_sel;
 105         break;
 106     case SYBORG_VIRTIO_STATUS:
 107         ret = vdev->status;
 108         break;
 109     case SYBORG_VIRTIO_INT_ENABLE:
 110         ret = s->int_enable;
 111         break;
 112     case SYBORG_VIRTIO_INT_STATUS:
 113         ret = vdev->isr;
 114         break;
 115     default:
 116         BADF("Bad read offset 0x%x\n", (int)offset);
 117         return 0;
 118     }
 119     return ret;
 120 }
 121
 122 static void syborg_virtio_writel(void *opaque, target_phys_addr_t offset,
 123                                  uint32_t value)
 124 {
 125     SyborgVirtIOProxy *s = opaque;
 126     VirtIODevice *vdev = s->vdev;
 127
 128     DPRINTF("writel 0x%x = 0x%x\n", (int)offset, value);
 129     if (offset >= SYBORG_VIRTIO_CONFIG) {
 130         return virtio_config_writel(vdev, offset - SYBORG_VIRTIO_CONFIG,
 131                                     value);
 132     }
 133     switch (offset >> 2) {
 134     case SYBORG_VIRTIO_GUEST_FEATURES:
 135         if (vdev->set_features)
 136             vdev->set_features(vdev, value);
 137         vdev->guest_features = value;
 138         break;
 139     case SYBORG_VIRTIO_QUEUE_BASE:
 140         if (value == 0)
 141             virtio_reset(vdev);
 142         else
 143             virtio_queue_set_addr(vdev, vdev->queue_sel, value);
 144         break;
 145     case SYBORG_VIRTIO_QUEUE_SEL:
 146         if (value < VIRTIO_PCI_QUEUE_MAX)
 147             vdev->queue_sel = value;
 148         break;
 149     case SYBORG_VIRTIO_QUEUE_NOTIFY:
 150         virtio_queue_notify(vdev, value);
 151         break;
 152     case SYBORG_VIRTIO_STATUS:
 153         virtio_set_status(vdev, value & 0xFF);
 154         if (vdev->status == 0)
 155             virtio_reset(vdev);
 156         break;
 157     case SYBORG_VIRTIO_INT_ENABLE:
 158         s->int_enable = value;
 159         virtio_update_irq(vdev);
 160         break;
 161     case SYBORG_VIRTIO_INT_STATUS:
 162         vdev->isr &= ~value;
 163         virtio_update_irq(vdev);
 164         break;
 165     default:
 166         BADF("Bad write offset 0x%x\n", (int)offset);
 167         break;
 168     }
 169 }
 170
 171 static uint32_t syborg_virtio_readw(void *opaque, target_phys_addr_t offset)
 172 {
 173     SyborgVirtIOProxy *s = opaque;
 174     VirtIODevice *vdev = s->vdev;
 175
 176     DPRINTF("readw 0x%x\n", (int)offset);
 177     if (offset >= SYBORG_VIRTIO_CONFIG) {
 178         return virtio_config_readw(vdev, offset - SYBORG_VIRTIO_CONFIG);
 179     }
 180     BADF("Bad halfword read offset 0x%x\n", (int)offset);
 181     return -1;
 182 }
 183
 184 static void syborg_virtio_writew(void *opaque, target_phys_addr_t offset,
 185                                  uint32_t value)
 186 {
 187     SyborgVirtIOProxy *s = opaque;
 188     VirtIODevice *vdev = s->vdev;
 189
 190     DPRINTF("writew 0x%x = 0x%x\n", (int)offset, value);
 191     if (offset >= SYBORG_VIRTIO_CONFIG) {
 192         return virtio_config_writew(vdev, offset - SYBORG_VIRTIO_CONFIG,
 193                                     value);
 194     }
 195     BADF("Bad halfword write offset 0x%x\n", (int)offset);
 196 }
 197
 198 static uint32_t syborg_virtio_readb(void *opaque, target_phys_addr_t offset)
 199 {
 200     SyborgVirtIOProxy *s = opaque;
 201     VirtIODevice *vdev = s->vdev;
 202
 203     DPRINTF("readb 0x%x\n", (int)offset);
 204     if (offset >= SYBORG_VIRTIO_CONFIG) {
 205         return virtio_config_readb(vdev, offset - SYBORG_VIRTIO_CONFIG);
 206     }
 207     BADF("Bad byte read offset 0x%x\n", (int)offset);
 208     return -1;
 209 }
 210
 211 static void syborg_virtio_writeb(void *opaque, target_phys_addr_t offset,
 212                                  uint32_t value)
 213 {
 214     SyborgVirtIOProxy *s = opaque;
 215     VirtIODevice *vdev = s->vdev;
 216
 217     DPRINTF("writeb 0x%x = 0x%x\n", (int)offset, value);
 218     if (offset >= SYBORG_VIRTIO_CONFIG) {
 219         return virtio_config_writeb(vdev, offset - SYBORG_VIRTIO_CONFIG,
 220                                     value);
 221     }
 222     BADF("Bad byte write offset 0x%x\n", (int)offset);
 223 }
 224
 225 static CPUReadMemoryFunc * const syborg_virtio_readfn[] = {
 226      syborg_virtio_readb,
 227      syborg_virtio_readw,
 228      syborg_virtio_readl
 229 };
 230
 231 static CPUWriteMemoryFunc * const syborg_virtio_writefn[] = {
 232      syborg_virtio_writeb,
 233      syborg_virtio_writew,
 234      syborg_virtio_writel
 235 };
 236
 237 static void syborg_virtio_update_irq(void *opaque, uint16_t vector)
 238 {
 239     SyborgVirtIOProxy *proxy = opaque;
 240     int level;
 241
 242     level = proxy->int_enable & proxy->vdev->isr;
 243     DPRINTF("IRQ %d\n", level);
 244     qemu_set_irq(proxy->irq, level != 0);
 245 }
 246
 247 static unsigned syborg_virtio_get_features(void *opaque)
 248 {
 249     SyborgVirtIOProxy *proxy = opaque;
 250     return proxy->host_features;
 251 }
 252
 253 static VirtIOBindings syborg_virtio_bindings = {
 254     .notify = syborg_virtio_update_irq,
 255     .get_features = syborg_virtio_get_features,
 256 };
 257
 258 static int syborg_virtio_init(SyborgVirtIOProxy *proxy, VirtIODevice *vdev)
 259 {
 260     int iomemtype;
 261
 262     proxy->vdev = vdev;
 263
 264     /* Don't support multiple vectors */
 265     proxy->vdev->nvectors = 0;
 266     sysbus_init_irq(&proxy->busdev, &proxy->irq);
 267     iomemtype = cpu_register_io_memory(syborg_virtio_readfn,
 268                                        syborg_virtio_writefn, proxy,
 269                                        DEVICE_NATIVE_ENDIAN);
 270     sysbus_init_mmio(&proxy->busdev, 0x1000, iomemtype);
 271
 272     proxy->id = ((uint32_t)0x1af4 << 16) | vdev->device_id;
 273
 274     qemu_register_reset(virtio_reset, vdev);
 275
 276     virtio_bind_device(vdev, &syborg_virtio_bindings, proxy);
 277     proxy->host_features |= (0x1 << VIRTIO_F_NOTIFY_ON_EMPTY);
 278     proxy->host_features = vdev->get_features(vdev, proxy->host_features);
 279     return 0;
 280 }
 281
 282 /* Device specific bindings.  */
 283
 284 static int syborg_virtio_net_init(SysBusDevice *dev)
 285 {
 286     VirtIODevice *vdev;
 287     SyborgVirtIOProxy *proxy = FROM_SYSBUS(SyborgVirtIOProxy, dev);
 288
 289     vdev = virtio_net_init(&dev->qdev, &proxy->nic, &proxy->net);
 290     return syborg_virtio_init(proxy, vdev);
 291 }
 292
 293 static SysBusDeviceInfo syborg_virtio_net_info = {
 294     .init = syborg_virtio_net_init,
 295     .qdev.name  = "syborg,virtio-net",
 296     .qdev.size  = sizeof(SyborgVirtIOProxy),
 297     .qdev.props = (Property[]) {
 298         DEFINE_NIC_PROPERTIES(SyborgVirtIOProxy, nic),
 299         DEFINE_VIRTIO_NET_FEATURES(SyborgVirtIOProxy, host_features),
 300         DEFINE_PROP_UINT32("x-txtimer", SyborgVirtIOProxy,
 301                            net.txtimer, TX_TIMER_INTERVAL),
 302         DEFINE_PROP_INT32("x-txburst", SyborgVirtIOProxy,
 303                           net.txburst, TX_BURST),
 304         DEFINE_PROP_STRING("tx", SyborgVirtIOProxy, net.tx),
 305         DEFINE_PROP_END_OF_LIST(),
 306     }
 307 };
 308
 309 static void syborg_virtio_register_devices(void)
 310 {
 311     sysbus_register_withprop(&syborg_virtio_net_info);
 312 }
 313
 314 device_init(syborg_virtio_register_devices)