Syborg virtio bindings.

Implement Syborg device bindings for virtio-net.

Signed-off-by: Paul Brook <paul@codesourcery.com>

1 files changed, 278 insertions, 0 deletions

diff --git a/hw/syborg_virtio.c b/hw/syborg_virtio.c
new file mode 100644
index 0000000..37c219c
--- /dev/null
+++ b/hw/syborg_virtio.c
@@ -0,0 +1,278 @@
+/*
+ * Virtio Syborg bindings
+ *
+ * Copyright (c) 2009 CodeSourcery
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "syborg.h"
+#include "sysbus.h"
+#include "virtio.h"
+#include "sysemu.h"
+
+//#define DEBUG_SYBORG_VIRTIO
+
+#ifdef DEBUG_SYBORG_VIRTIO
+#define DPRINTF(fmt, ...) \
+do { printf("syborg_virtio: " fmt , ## __VA_ARGS__); } while (0)
+#define BADF(fmt, ...) \
+do { fprintf(stderr, "syborg_virtio: error: " fmt , ## __VA_ARGS__); \
+    exit(1);} while (0)
+#else
+#define DPRINTF(fmt, ...) do {} while(0)
+#define BADF(fmt, ...) \
+do { fprintf(stderr, "syborg_virtio: error: " fmt , ## __VA_ARGS__);} while (0)
+#endif
+
+enum {
+    SYBORG_VIRTIO_ID             = 0,
+    SYBORG_VIRTIO_DEVTYPE        = 1,
+    SYBORG_VIRTIO_HOST_FEATURES  = 2,
+    SYBORG_VIRTIO_GUEST_FEATURES = 3,
+    SYBORG_VIRTIO_QUEUE_BASE     = 4,
+    SYBORG_VIRTIO_QUEUE_NUM      = 5,
+    SYBORG_VIRTIO_QUEUE_SEL      = 6,
+    SYBORG_VIRTIO_QUEUE_NOTIFY   = 7,
+    SYBORG_VIRTIO_STATUS         = 8,
+    SYBORG_VIRTIO_INT_ENABLE     = 9,
+    SYBORG_VIRTIO_INT_STATUS     = 10
+};
+
+#define SYBORG_VIRTIO_CONFIG 0x100
+
+/* Device independent interface.  */
+
+typedef struct {
+    SysBusDevice busdev;
+    VirtIODevice *vdev;
+    qemu_irq irq;
+    uint32_t int_enable;
+    uint32_t id;
+} SyborgVirtIOProxy;
+
+static uint32_t syborg_virtio_readl(void *opaque, target_phys_addr_t offset)
+{
+    SyborgVirtIOProxy *s = opaque;
+    VirtIODevice *vdev = s->vdev;
+    uint32_t ret;
+
+    DPRINTF("readl 0x%x\n", (int)offset);
+    if (offset >= SYBORG_VIRTIO_CONFIG) {
+        return virtio_config_readl(vdev, offset - SYBORG_VIRTIO_CONFIG);
+    }
+    switch(offset >> 2) {
+    case SYBORG_VIRTIO_ID:
+        ret = SYBORG_ID_VIRTIO;
+        break;
+    case SYBORG_VIRTIO_DEVTYPE:
+        ret = s->id;
+        break;
+    case SYBORG_VIRTIO_HOST_FEATURES:
+        ret = vdev->get_features(vdev);
+        ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY);
+        break;
+    case SYBORG_VIRTIO_GUEST_FEATURES:
+        ret = vdev->features;
+        break;
+    case SYBORG_VIRTIO_QUEUE_BASE:
+        ret = virtio_queue_get_addr(vdev, vdev->queue_sel);
+        break;
+    case SYBORG_VIRTIO_QUEUE_NUM:
+        ret = virtio_queue_get_num(vdev, vdev->queue_sel);
+        break;
+    case SYBORG_VIRTIO_QUEUE_SEL:
+        ret = vdev->queue_sel;
+        break;
+    case SYBORG_VIRTIO_STATUS:
+        ret = vdev->status;
+        break;
+    case SYBORG_VIRTIO_INT_ENABLE:
+        ret = s->int_enable;
+        break;
+    case SYBORG_VIRTIO_INT_STATUS:
+        ret = vdev->isr;
+        break;
+    default:
+        BADF("Bad read offset 0x%x\n", (int)offset);
+        return 0;
+    }
+    return ret;
+}
+
+static void syborg_virtio_writel(void *opaque, target_phys_addr_t offset,
+                                 uint32_t value)
+{
+    SyborgVirtIOProxy *s = opaque;
+    VirtIODevice *vdev = s->vdev;
+
+    DPRINTF("writel 0x%x = 0x%x\n", (int)offset, value);
+    if (offset >= SYBORG_VIRTIO_CONFIG) {
+        return virtio_config_writel(vdev, offset - SYBORG_VIRTIO_CONFIG,
+                                    value);
+    }
+    switch (offset >> 2) {
+    case SYBORG_VIRTIO_GUEST_FEATURES:
+        if (vdev->set_features)
+            vdev->set_features(vdev, value);
+        vdev->features = value;
+        break;
+    case SYBORG_VIRTIO_QUEUE_BASE:
+        virtio_queue_set_addr(vdev, vdev->queue_sel, value);
+        break;
+    case SYBORG_VIRTIO_QUEUE_SEL:
+        if (value < VIRTIO_PCI_QUEUE_MAX)
+            vdev->queue_sel = value;
+        break;
+    case SYBORG_VIRTIO_QUEUE_NOTIFY:
+        virtio_queue_notify(vdev, value);
+        break;
+    case SYBORG_VIRTIO_STATUS:
+        vdev->status = value & 0xFF;
+        if (vdev->status == 0)
+            virtio_reset(vdev);
+        break;
+    case SYBORG_VIRTIO_INT_ENABLE:
+        s->int_enable = value;
+        virtio_update_irq(vdev);
+        break;
+    case SYBORG_VIRTIO_INT_STATUS:
+        vdev->isr &= ~value;
+        virtio_update_irq(vdev);
+        break;
+    default:
+        BADF("Bad write offset 0x%x\n", (int)offset);
+        break;
+    }
+}
+
+static uint32_t syborg_virtio_readw(void *opaque, target_phys_addr_t offset)
+{
+    SyborgVirtIOProxy *s = opaque;
+    VirtIODevice *vdev = s->vdev;
+
+    DPRINTF("readw 0x%x\n", (int)offset);
+    if (offset >= SYBORG_VIRTIO_CONFIG) {
+        return virtio_config_readw(vdev, offset - SYBORG_VIRTIO_CONFIG);
+    }
+    BADF("Bad halfword read offset 0x%x\n", (int)offset);
+    return -1;
+}
+
+static void syborg_virtio_writew(void *opaque, target_phys_addr_t offset,
+                                 uint32_t value)
+{
+    SyborgVirtIOProxy *s = opaque;
+    VirtIODevice *vdev = s->vdev;
+
+    DPRINTF("writew 0x%x = 0x%x\n", (int)offset, value);
+    if (offset >= SYBORG_VIRTIO_CONFIG) {
+        return virtio_config_writew(vdev, offset - SYBORG_VIRTIO_CONFIG,
+                                    value);
+    }
+    BADF("Bad halfword write offset 0x%x\n", (int)offset);
+}
+
+static uint32_t syborg_virtio_readb(void *opaque, target_phys_addr_t offset)
+{
+    SyborgVirtIOProxy *s = opaque;
+    VirtIODevice *vdev = s->vdev;
+
+    DPRINTF("readb 0x%x\n", (int)offset);
+    if (offset >= SYBORG_VIRTIO_CONFIG) {
+        return virtio_config_readb(vdev, offset - SYBORG_VIRTIO_CONFIG);
+    }
+    BADF("Bad byte read offset 0x%x\n", (int)offset);
+    return -1;
+}
+
+static void syborg_virtio_writeb(void *opaque, target_phys_addr_t offset,
+                                 uint32_t value)
+{
+    SyborgVirtIOProxy *s = opaque;
+    VirtIODevice *vdev = s->vdev;
+
+    DPRINTF("writeb 0x%x = 0x%x\n", (int)offset, value);
+    if (offset >= SYBORG_VIRTIO_CONFIG) {
+        return virtio_config_writeb(vdev, offset - SYBORG_VIRTIO_CONFIG,
+                                    value);
+    }
+    BADF("Bad byte write offset 0x%x\n", (int)offset);
+}
+
+static CPUReadMemoryFunc *syborg_virtio_readfn[] = {
+     syborg_virtio_readb,
+     syborg_virtio_readw,
+     syborg_virtio_readl
+};
+
+static CPUWriteMemoryFunc *syborg_virtio_writefn[] = {
+     syborg_virtio_writeb,
+     syborg_virtio_writew,
+     syborg_virtio_writel
+};
+
+static void syborg_virtio_update_irq(void *opaque)
+{
+    SyborgVirtIOProxy *proxy = opaque;
+    int level;
+
+    level = proxy->int_enable & proxy->vdev->isr;
+    DPRINTF("IRQ %d\n", level);
+    qemu_set_irq(proxy->irq, level != 0);
+}
+
+static VirtIOBindings syborg_virtio_bindings = {
+    .update_irq = syborg_virtio_update_irq
+};
+
+static void syborg_virtio_init(SyborgVirtIOProxy *proxy, VirtIODevice *vdev)
+{
+    int iomemtype;
+
+    proxy->vdev = vdev;
+
+    sysbus_init_irq(&proxy->busdev, &proxy->irq);
+    iomemtype = cpu_register_io_memory(0, syborg_virtio_readfn,
+                                       syborg_virtio_writefn, proxy);
+    sysbus_init_mmio(&proxy->busdev, 0x1000, iomemtype);
+
+    proxy->id = ((uint32_t)0x1af4 << 16) | vdev->device_id;
+
+    virtio_bind_device(vdev, &syborg_virtio_bindings, proxy);
+}
+
+/* Device specific bindings.  */
+
+static void syborg_virtio_net_init(SysBusDevice *dev)
+{
+    VirtIODevice *vdev;
+    SyborgVirtIOProxy *proxy = FROM_SYSBUS(SyborgVirtIOProxy, dev);
+
+    vdev = virtio_net_init(&dev->qdev);
+    syborg_virtio_init(proxy, vdev);
+}
+
+static void syborg_virtio_register_devices(void)
+{
+    sysbus_register_dev("syborg,virtio-net", sizeof(SyborgVirtIOProxy),
+                        syborg_virtio_net_init);
+}
+
+device_init(syborg_virtio_register_devices)