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