virtio-mmio: device probing and initialization.

Add virtio_mmio_setup_one() to setup virtio mmio devices.  Add
vp_init_mmio() to initialize device struct.  Because virtio-pci and
virtio-mmio are quite simliar we reuse the infrastructure we already
have for virtio-pci and just setup struct vp_cap for virtio-mmio.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

4 files changed, 136 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 9e8188e..1564de0 100644
--- a/Makefile
+++ b/Makefile
@@ -43,7 +43,7 @@ SRC32FLAT=$(SRCBOTH) post.c e820map.c malloc.c romfile.c x86.c optionroms.c \
     fw/coreboot.c fw/lzmadecode.c fw/multiboot.c fw/csm.c fw/biostables.c \
     fw/paravirt.c fw/shadow.c fw/pciinit.c fw/smm.c fw/smp.c fw/mtrr.c fw/xen.c \
     fw/acpi.c fw/mptable.c fw/pirtable.c fw/smbios.c fw/romfile_loader.c \
-    hw/virtio-ring.c hw/virtio-pci.c hw/virtio-blk.c hw/virtio-scsi.c \
+    hw/virtio-ring.c hw/virtio-pci.c hw/virtio-mmio.c hw/virtio-blk.c hw/virtio-scsi.c \
     hw/tpm_drivers.c hw/nvme.c
 SRC32SEG=string.c output.c pcibios.c apm.c stacks.c hw/pci.c hw/serialio.c
 DIRS=src src/hw src/fw vgasrc
diff --git a/src/hw/virtio-mmio.c b/src/hw/virtio-mmio.c
new file mode 100644
index 0000000..0d6ef6e
--- /dev/null
+++ b/src/hw/virtio-mmio.c
@@ -0,0 +1,58 @@
+#include "config.h" // CONFIG_DEBUG_LEVEL
+#include "malloc.h" // free
+#include "output.h" // dprintf
+#include "stacks.h" // run_thread
+#include "string.h" // memset
+#include "virtio-pci.h"
+#include "virtio-ring.h"
+#include "virtio-mmio.h"
+
+void virtio_mmio_setup_one(u64 addr)
+{
+    u32 magic, version, devid;
+    void *mmio;
+
+    if (addr >= 0x100000000) {
+        dprintf(1, "virtio-mmio: %llx: above 4G\n", addr);
+        return;
+    }
+
+    mmio = (void*)(u32)(addr);
+    magic = readl(mmio);
+    if (magic != 0x74726976) {
+        dprintf(1, "virtio-mmio: %llx: magic mismatch\n", addr);
+        return;
+    }
+    version = readl(mmio+4);
+    if (version != 1 /* legacy */ &&
+        version != 2 /* 1.0 */) {
+        dprintf(1, "virtio-mmio: %llx: unknown version %d\n", addr, version);
+        return;
+    }
+    devid = readl(mmio+8);
+    dprintf(1, "virtio-mmio: %llx: device id %x%s\n",
+            addr, devid, version == 1 ? " (legacy)" : "");
+    switch (devid) {
+    case 2: /* blk */
+        /* TODO */
+        break;
+    case 8: /* scsi */
+        /* TODO */
+        break;
+    default:
+        break;
+    }
+}
+
+void vp_init_mmio(struct vp_device *vp, void *mmio)
+{
+    memset(vp, 0, sizeof(*vp));
+    vp->use_mmio = 1;
+    vp->common.mode = VP_ACCESS_MMIO;
+    vp->common.memaddr = mmio;
+    vp->device.mode = VP_ACCESS_MMIO;
+    vp->device.memaddr = mmio + 0x100;
+    vp_reset(vp);
+    vp_set_status(vp, VIRTIO_CONFIG_S_ACKNOWLEDGE |
+                  VIRTIO_CONFIG_S_DRIVER);
+}
diff --git a/src/hw/virtio-mmio.h b/src/hw/virtio-mmio.h
new file mode 100644
index 0000000..9e0dae4
--- /dev/null
+++ b/src/hw/virtio-mmio.h
@@ -0,0 +1,76 @@
+#ifndef _VIRTIO_MMIO_H
+#define _VIRTIO_MMIO_H
+
+struct vp_device;
+
+typedef struct virtio_mmio_cfg {
+    u32 magic;
+    u32 version;
+    u32 device_id;
+    u32 vendor_id;
+
+    u32 device_feature;
+    u32 device_feature_select;
+    u32 res_18;
+    u32 res_1c;
+
+    u32 guest_feature;
+    u32 guest_feature_select;
+    u32 legacy_guest_page_size;
+    u32 res_2c;
+
+    u32 queue_select;
+    u32 queue_num_max;
+    u32 queue_num;
+    u32 legacy_queue_align;
+
+    u32 legacy_queue_pfn;
+    u32 queue_ready;
+    u32 res_48;
+    u32 res_4c;
+
+    u32 queue_notify;
+    u32 res_54;
+    u32 res_58;
+    u32 res_5c;
+
+    u32 irq_status;
+    u32 irq_ack;
+    u32 res_68;
+    u32 res_6c;
+
+    u32 device_status;
+    u32 res_74;
+    u32 res_78;
+    u32 res_7c;
+
+    u32 queue_desc_lo;
+    u32 queue_desc_hi;
+    u32 res_88;
+    u32 res_8c;
+
+    u32 queue_driver_lo;
+    u32 queue_driver_hi;
+    u32 res_98;
+    u32 res_9c;
+
+    u32 queue_device_lo;
+    u32 queue_device_hi;
+    u32 res_a8;
+    u32 shm_sel;
+
+    u32 shmem_len_lo;
+    u32 shmem_len_hi;
+    u32 shmem_base_lo;
+    u32 shmem_base_hi;
+
+    u32 res_c0_f7[14];
+
+    u32 res_f8;
+    u32 config_generation;
+} virtio_mmio_cfg;
+
+void virtio_mmio_setup_one(u64 mmio);
+void vp_init_mmio(struct vp_device *vp, void *mmio);
+
+#endif /* _VIRTIO_MMIO_H */
diff --git a/src/hw/virtio-pci.h b/src/hw/virtio-pci.h
index 492e5c7..2696264 100644
--- a/src/hw/virtio-pci.h
+++ b/src/hw/virtio-pci.h
@@ -111,6 +111,7 @@ struct vp_device {
     struct vp_cap common, notify, isr, device, legacy;
     u32 notify_off_multiplier;
     u8 use_modern;
+    u8 use_mmio;
 };
 
 u64 _vp_read(struct vp_cap *cap, u32 offset, u8 size);