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 } SyborgVirtIOProxy;
  69
  70 static uint32_t syborg_virtio_readl(void *opaque, target_phys_addr_t offset)
  71 {
  72     SyborgVirtIOProxy *s = opaque;
  73     VirtIODevice *vdev = s->vdev;
  74     uint32_t ret;
  75
  76     DPRINTF("readl 0x%x\n", (int)offset);
  77     if (offset >= SYBORG_VIRTIO_CONFIG) {
  78         return virtio_config_readl(vdev, offset - SYBORG_VIRTIO_CONFIG);
  79     }
  80     switch(offset >> 2) {
  81     case SYBORG_VIRTIO_ID:
  82         ret = SYBORG_ID_VIRTIO;
  83         break;
  84     case SYBORG_VIRTIO_DEVTYPE:
  85         ret = s->id;
  86         break;
  87     case SYBORG_VIRTIO_HOST_FEATURES:
  88         ret = vdev->get_features(vdev);
  89         ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY);
  90         break;
  91     case SYBORG_VIRTIO_GUEST_FEATURES:
  92         ret = vdev->features;
  93         break;
  94     case SYBORG_VIRTIO_QUEUE_BASE:
  95         ret = virtio_queue_get_addr(vdev, vdev->queue_sel);
  96         break;
  97     case SYBORG_VIRTIO_QUEUE_NUM:
  98         ret = virtio_queue_get_num(vdev, vdev->queue_sel);
  99         break;
 100     case SYBORG_VIRTIO_QUEUE_SEL:
 101         ret = vdev->queue_sel;
 102         break;
 103     case SYBORG_VIRTIO_STATUS:
 104         ret = vdev->status;
 105         break;
 106     case SYBORG_VIRTIO_INT_ENABLE:
 107         ret = s->int_enable;
 108         break;
 109     case SYBORG_VIRTIO_INT_STATUS:
 110         ret = vdev->isr;
 111         break;
 112     default:
 113         BADF("Bad read offset 0x%x\n", (int)offset);
 114         return 0;
 115     }
 116     return ret;
 117 }
 118
 119 static void syborg_virtio_writel(void *opaque, target_phys_addr_t offset,
 120                                  uint32_t value)
 121 {
 122     SyborgVirtIOProxy *s = opaque;
 123     VirtIODevice *vdev = s->vdev;
 124
 125     DPRINTF("writel 0x%x = 0x%x\n", (int)offset, value);
 126     if (offset >= SYBORG_VIRTIO_CONFIG) {
 127         return virtio_config_writel(vdev, offset - SYBORG_VIRTIO_CONFIG,
 128                                     value);
 129     }
 130     switch (offset >> 2) {
 131     case SYBORG_VIRTIO_GUEST_FEATURES:
 132         if (vdev->set_features)
 133             vdev->set_features(vdev, value);
 134         vdev->features = value;
 135         break;
 136     case SYBORG_VIRTIO_QUEUE_BASE:
 137         if (value == 0)
 138             virtio_reset(vdev);
 139         else
 140             virtio_queue_set_addr(vdev, vdev->queue_sel, value);
 141         break;
 142     case SYBORG_VIRTIO_QUEUE_SEL:
 143         if (value < VIRTIO_PCI_QUEUE_MAX)
 144             vdev->queue_sel = value;
 145         break;
 146     case SYBORG_VIRTIO_QUEUE_NOTIFY:
 147         virtio_queue_notify(vdev, value);
 148         break;
 149     case SYBORG_VIRTIO_STATUS:
 150         vdev->status = value & 0xFF;
 151         if (vdev->status == 0)
 152             virtio_reset(vdev);
 153         break;
 154     case SYBORG_VIRTIO_INT_ENABLE:
 155         s->int_enable = value;
 156         virtio_update_irq(vdev);
 157         break;
 158     case SYBORG_VIRTIO_INT_STATUS:
 159         vdev->isr &= ~value;
 160         virtio_update_irq(vdev);
 161         break;
 162     default:
 163         BADF("Bad write offset 0x%x\n", (int)offset);
 164         break;
 165     }
 166 }
 167
 168 static uint32_t syborg_virtio_readw(void *opaque, target_phys_addr_t offset)
 169 {
 170     SyborgVirtIOProxy *s = opaque;
 171     VirtIODevice *vdev = s->vdev;
 172
 173     DPRINTF("readw 0x%x\n", (int)offset);
 174     if (offset >= SYBORG_VIRTIO_CONFIG) {
 175         return virtio_config_readw(vdev, offset - SYBORG_VIRTIO_CONFIG);
 176     }
 177     BADF("Bad halfword read offset 0x%x\n", (int)offset);
 178     return -1;
 179 }
 180
 181 static void syborg_virtio_writew(void *opaque, target_phys_addr_t offset,
 182                                  uint32_t value)
 183 {
 184     SyborgVirtIOProxy *s = opaque;
 185     VirtIODevice *vdev = s->vdev;
 186
 187     DPRINTF("writew 0x%x = 0x%x\n", (int)offset, value);
 188     if (offset >= SYBORG_VIRTIO_CONFIG) {
 189         return virtio_config_writew(vdev, offset - SYBORG_VIRTIO_CONFIG,
 190                                     value);
 191     }
 192     BADF("Bad halfword write offset 0x%x\n", (int)offset);
 193 }
 194
 195 static uint32_t syborg_virtio_readb(void *opaque, target_phys_addr_t offset)
 196 {
 197     SyborgVirtIOProxy *s = opaque;
 198     VirtIODevice *vdev = s->vdev;
 199
 200     DPRINTF("readb 0x%x\n", (int)offset);
 201     if (offset >= SYBORG_VIRTIO_CONFIG) {
 202         return virtio_config_readb(vdev, offset - SYBORG_VIRTIO_CONFIG);
 203     }
 204     BADF("Bad byte read offset 0x%x\n", (int)offset);
 205     return -1;
 206 }
 207
 208 static void syborg_virtio_writeb(void *opaque, target_phys_addr_t offset,
 209                                  uint32_t value)
 210 {
 211     SyborgVirtIOProxy *s = opaque;
 212     VirtIODevice *vdev = s->vdev;
 213
 214     DPRINTF("writeb 0x%x = 0x%x\n", (int)offset, value);
 215     if (offset >= SYBORG_VIRTIO_CONFIG) {
 216         return virtio_config_writeb(vdev, offset - SYBORG_VIRTIO_CONFIG,
 217                                     value);
 218     }
 219     BADF("Bad byte write offset 0x%x\n", (int)offset);
 220 }
 221
 222 static CPUReadMemoryFunc *syborg_virtio_readfn[] = {
 223      syborg_virtio_readb,
 224      syborg_virtio_readw,
 225      syborg_virtio_readl
 226 };
 227
 228 static CPUWriteMemoryFunc *syborg_virtio_writefn[] = {
 229      syborg_virtio_writeb,
 230      syborg_virtio_writew,
 231      syborg_virtio_writel
 232 };
 233
 234 static void syborg_virtio_update_irq(void *opaque, uint16_t vector)
 235 {
 236     SyborgVirtIOProxy *proxy = opaque;
 237     int level;
 238
 239     level = proxy->int_enable & proxy->vdev->isr;
 240     DPRINTF("IRQ %d\n", level);
 241     qemu_set_irq(proxy->irq, level != 0);
 242 }
 243
 244 static VirtIOBindings syborg_virtio_bindings = {
 245     .notify = syborg_virtio_update_irq
 246 };
 247
 248 static void syborg_virtio_init(SyborgVirtIOProxy *proxy, VirtIODevice *vdev)
 249 {
 250     int iomemtype;
 251
 252     proxy->vdev = vdev;
 253
 254     /* Don't support multiple vectors */
 255     proxy->vdev->nvectors = 0;
 256     sysbus_init_irq(&proxy->busdev, &proxy->irq);
 257     iomemtype = cpu_register_io_memory(syborg_virtio_readfn,
 258                                        syborg_virtio_writefn, proxy);
 259     sysbus_init_mmio(&proxy->busdev, 0x1000, iomemtype);
 260
 261     proxy->id = ((uint32_t)0x1af4 << 16) | vdev->device_id;
 262
 263     qemu_register_reset(virtio_reset, vdev);
 264
 265     virtio_bind_device(vdev, &syborg_virtio_bindings, proxy);
 266 }
 267
 268 /* Device specific bindings.  */
 269
 270 static void syborg_virtio_net_init(SysBusDevice *dev)
 271 {
 272     VirtIODevice *vdev;
 273     SyborgVirtIOProxy *proxy = FROM_SYSBUS(SyborgVirtIOProxy, dev);
 274
 275     vdev = virtio_net_init(&dev->qdev);
 276     syborg_virtio_init(proxy, vdev);
 277 }
 278
 279 static void syborg_virtio_register_devices(void)
 280 {
 281     sysbus_register_dev("syborg,virtio-net", sizeof(SyborgVirtIOProxy),
 282                         syborg_virtio_net_init);
 283 }
 284
 285 device_init(syborg_virtio_register_devices)