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
  30 //#define DEBUG_SYBORG_VIRTIO
  31
  32 #ifdef DEBUG_SYBORG_VIRTIO
  33 #define DPRINTF(fmt, ...) \
  34 do { printf("syborg_virtio: " fmt , ## __VA_ARGS__); } while (0)
  35 #define BADF(fmt, ...) \
  36 do { fprintf(stderr, "syborg_virtio: error: " fmt , ## __VA_ARGS__); \
  37     exit(1);} while (0)
  38 #else
  39 #define DPRINTF(fmt, ...) do {} while(0)
  40 #define BADF(fmt, ...) \
  41 do { fprintf(stderr, "syborg_virtio: error: " fmt , ## __VA_ARGS__);} while (0)
  42 #endif
  43
  44 enum {
  45     SYBORG_VIRTIO_ID             = 0,
  46     SYBORG_VIRTIO_DEVTYPE        = 1,
  47     SYBORG_VIRTIO_HOST_FEATURES  = 2,
  48     SYBORG_VIRTIO_GUEST_FEATURES = 3,
  49     SYBORG_VIRTIO_QUEUE_BASE     = 4,
  50     SYBORG_VIRTIO_QUEUE_NUM      = 5,
  51     SYBORG_VIRTIO_QUEUE_SEL      = 6,
  52     SYBORG_VIRTIO_QUEUE_NOTIFY   = 7,
  53     SYBORG_VIRTIO_STATUS         = 8,
  54     SYBORG_VIRTIO_INT_ENABLE     = 9,
  55     SYBORG_VIRTIO_INT_STATUS     = 10
  56 };
  57
  58 #define SYBORG_VIRTIO_CONFIG 0x100
  59
  60 /* Device independent interface.  */
  61
  62 typedef struct {
  63     SysBusDevice busdev;
  64     VirtIODevice *vdev;
  65     qemu_irq irq;
  66     uint32_t int_enable;
  67     uint32_t id;
  68     NICConf nic;
  69     uint32_t host_features;
  70     virtio_net_conf net;
  71 } SyborgVirtIOProxy;
  72
  73 static uint32_t syborg_virtio_readl(void *opaque, target_phys_addr_t offset)
  74 {
  75     SyborgVirtIOProxy *s = opaque;
  76     VirtIODevice *vdev = s->vdev;
  77     uint32_t ret;
  78
  79     DPRINTF("readl 0x%x\n", (int)offset);
  80     if (offset >= SYBORG_VIRTIO_CONFIG) {
  81         return virtio_config_readl(vdev, offset - SYBORG_VIRTIO_CONFIG);
  82     }
  83     switch(offset >> 2) {
  84     case SYBORG_VIRTIO_ID:
  85         ret = SYBORG_ID_VIRTIO;
  86         break;
  87     case SYBORG_VIRTIO_DEVTYPE:
  88         ret = s->id;
  89         break;
  90     case SYBORG_VIRTIO_HOST_FEATURES:
  91         ret = s->host_features;
  92         break;
  93     case SYBORG_VIRTIO_GUEST_FEATURES:
  94         ret = vdev->guest_features;
  95         break;
  96     case SYBORG_VIRTIO_QUEUE_BASE:
  97         ret = virtio_queue_get_addr(vdev, vdev->queue_sel);
  98         break;
  99     case SYBORG_VIRTIO_QUEUE_NUM:
 100         ret = virtio_queue_get_num(vdev, vdev->queue_sel);
 101         break;
 102     case SYBORG_VIRTIO_QUEUE_SEL:
 103         ret = vdev->queue_sel;
 104         break;
 105     case SYBORG_VIRTIO_STATUS:
 106         ret = vdev->status;
 107         break;
 108     case SYBORG_VIRTIO_INT_ENABLE:
 109         ret = s->int_enable;
 110         break;
 111     case SYBORG_VIRTIO_INT_STATUS:
 112         ret = vdev->isr;
 113         break;
 114     default:
 115         BADF("Bad read offset 0x%x\n", (int)offset);
 116         return 0;
 117     }
 118     return ret;
 119 }
 120
 121 static void syborg_virtio_writel(void *opaque, target_phys_addr_t offset,
 122                                  uint32_t value)
 123 {
 124     SyborgVirtIOProxy *s = opaque;
 125     VirtIODevice *vdev = s->vdev;
 126
 127     DPRINTF("writel 0x%x = 0x%x\n", (int)offset, value);
 128     if (offset >= SYBORG_VIRTIO_CONFIG) {
 129         return virtio_config_writel(vdev, offset - SYBORG_VIRTIO_CONFIG,
 130                                     value);
 131     }
 132     switch (offset >> 2) {
 133     case SYBORG_VIRTIO_GUEST_FEATURES:
 134         if (vdev->set_features)
 135             vdev->set_features(vdev, value);
 136         vdev->guest_features = value;
 137         break;
 138     case SYBORG_VIRTIO_QUEUE_BASE:
 139         if (value == 0)
 140             virtio_reset(vdev);
 141         else
 142             virtio_queue_set_addr(vdev, vdev->queue_sel, value);
 143         break;
 144     case SYBORG_VIRTIO_QUEUE_SEL:
 145         if (value < VIRTIO_PCI_QUEUE_MAX)
 146             vdev->queue_sel = value;
 147         break;
 148     case SYBORG_VIRTIO_QUEUE_NOTIFY:
 149         if (value < VIRTIO_PCI_QUEUE_MAX) {
 150             virtio_queue_notify(vdev, value);
 151         }
 152         break;
 153     case SYBORG_VIRTIO_STATUS:
 154         virtio_set_status(vdev, value & 0xFF);
 155         if (vdev->status == 0)
 156             virtio_reset(vdev);
 157         break;
 158     case SYBORG_VIRTIO_INT_ENABLE:
 159         s->int_enable = value;
 160         virtio_update_irq(vdev);
 161         break;
 162     case SYBORG_VIRTIO_INT_STATUS:
 163         vdev->isr &= ~value;
 164         virtio_update_irq(vdev);
 165         break;
 166     default:
 167         BADF("Bad write offset 0x%x\n", (int)offset);
 168         break;
 169     }
 170 }
 171
 172 static uint32_t syborg_virtio_readw(void *opaque, target_phys_addr_t offset)
 173 {
 174     SyborgVirtIOProxy *s = opaque;
 175     VirtIODevice *vdev = s->vdev;
 176
 177     DPRINTF("readw 0x%x\n", (int)offset);
 178     if (offset >= SYBORG_VIRTIO_CONFIG) {
 179         return virtio_config_readw(vdev, offset - SYBORG_VIRTIO_CONFIG);
 180     }
 181     BADF("Bad halfword read offset 0x%x\n", (int)offset);
 182     return -1;
 183 }
 184
 185 static void syborg_virtio_writew(void *opaque, target_phys_addr_t offset,
 186                                  uint32_t value)
 187 {
 188     SyborgVirtIOProxy *s = opaque;
 189     VirtIODevice *vdev = s->vdev;
 190
 191     DPRINTF("writew 0x%x = 0x%x\n", (int)offset, value);
 192     if (offset >= SYBORG_VIRTIO_CONFIG) {
 193         return virtio_config_writew(vdev, offset - SYBORG_VIRTIO_CONFIG,
 194                                     value);
 195     }
 196     BADF("Bad halfword write offset 0x%x\n", (int)offset);
 197 }
 198
 199 static uint32_t syborg_virtio_readb(void *opaque, target_phys_addr_t offset)
 200 {
 201     SyborgVirtIOProxy *s = opaque;
 202     VirtIODevice *vdev = s->vdev;
 203
 204     DPRINTF("readb 0x%x\n", (int)offset);
 205     if (offset >= SYBORG_VIRTIO_CONFIG) {
 206         return virtio_config_readb(vdev, offset - SYBORG_VIRTIO_CONFIG);
 207     }
 208     BADF("Bad byte read offset 0x%x\n", (int)offset);
 209     return -1;
 210 }
 211
 212 static void syborg_virtio_writeb(void *opaque, target_phys_addr_t offset,
 213                                  uint32_t value)
 214 {
 215     SyborgVirtIOProxy *s = opaque;
 216     VirtIODevice *vdev = s->vdev;
 217
 218     DPRINTF("writeb 0x%x = 0x%x\n", (int)offset, value);
 219     if (offset >= SYBORG_VIRTIO_CONFIG) {
 220         return virtio_config_writeb(vdev, offset - SYBORG_VIRTIO_CONFIG,
 221                                     value);
 222     }
 223     BADF("Bad byte write offset 0x%x\n", (int)offset);
 224 }
 225
 226 static CPUReadMemoryFunc * const syborg_virtio_readfn[] = {
 227      syborg_virtio_readb,
 228      syborg_virtio_readw,
 229      syborg_virtio_readl
 230 };
 231
 232 static CPUWriteMemoryFunc * const syborg_virtio_writefn[] = {
 233      syborg_virtio_writeb,
 234      syborg_virtio_writew,
 235      syborg_virtio_writel
 236 };
 237
 238 static void syborg_virtio_update_irq(void *opaque, uint16_t vector)
 239 {
 240     SyborgVirtIOProxy *proxy = opaque;
 241     int level;
 242
 243     level = proxy->int_enable & proxy->vdev->isr;
 244     DPRINTF("IRQ %d\n", level);
 245     qemu_set_irq(proxy->irq, level != 0);
 246 }
 247
 248 static unsigned syborg_virtio_get_features(void *opaque)
 249 {
 250     SyborgVirtIOProxy *proxy = opaque;
 251     return proxy->host_features;
 252 }
 253
 254 static VirtIOBindings syborg_virtio_bindings = {
 255     .notify = syborg_virtio_update_irq,
 256     .get_features = syborg_virtio_get_features,
 257 };
 258
 259 static int syborg_virtio_init(SyborgVirtIOProxy *proxy, VirtIODevice *vdev)
 260 {
 261     int iomemtype;
 262
 263     proxy->vdev = vdev;
 264
 265     /* Don't support multiple vectors */
 266     proxy->vdev->nvectors = 0;
 267     sysbus_init_irq(&proxy->busdev, &proxy->irq);
 268     iomemtype = cpu_register_io_memory(syborg_virtio_readfn,
 269                                        syborg_virtio_writefn, proxy,
 270                                        DEVICE_NATIVE_ENDIAN);
 271     sysbus_init_mmio(&proxy->busdev, 0x1000, iomemtype);
 272
 273     proxy->id = ((uint32_t)0x1af4 << 16) | vdev->device_id;
 274
 275     qemu_register_reset(virtio_reset, vdev);
 276
 277     virtio_bind_device(vdev, &syborg_virtio_bindings, proxy);
 278     proxy->host_features |= (0x1 << VIRTIO_F_NOTIFY_ON_EMPTY);
 279     proxy->host_features = vdev->get_features(vdev, proxy->host_features);
 280     return 0;
 281 }
 282
 283 /* Device specific bindings.  */
 284
 285 static int syborg_virtio_net_init(SysBusDevice *dev)
 286 {
 287     VirtIODevice *vdev;
 288     SyborgVirtIOProxy *proxy = FROM_SYSBUS(SyborgVirtIOProxy, dev);
 289
 290     vdev = virtio_net_init(&dev->qdev, &proxy->nic, &proxy->net);
 291     return syborg_virtio_init(proxy, vdev);
 292 }
 293
 294 static SysBusDeviceInfo syborg_virtio_net_info = {
 295     .init = syborg_virtio_net_init,
 296     .qdev.name  = "syborg,virtio-net",
 297     .qdev.size  = sizeof(SyborgVirtIOProxy),
 298     .qdev.props = (Property[]) {
 299         DEFINE_NIC_PROPERTIES(SyborgVirtIOProxy, nic),
 300         DEFINE_VIRTIO_NET_FEATURES(SyborgVirtIOProxy, host_features),
 301         DEFINE_PROP_UINT32("x-txtimer", SyborgVirtIOProxy,
 302                            net.txtimer, TX_TIMER_INTERVAL),
 303         DEFINE_PROP_INT32("x-txburst", SyborgVirtIOProxy,
 304                           net.txburst, TX_BURST),
 305         DEFINE_PROP_STRING("tx", SyborgVirtIOProxy, net.tx),
 306         DEFINE_PROP_END_OF_LIST(),
 307     }
 308 };
 309
 310 static void syborg_virtio_register_devices(void)
 311 {
 312     sysbus_register_withprop(&syborg_virtio_net_info);
 313 }
 314
 315 device_init(syborg_virtio_register_devices)