Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 213 insertions, 0 deletions

diff --git a/hw/sd/aspeed_sdhci.c b/hw/sd/aspeed_sdhci.c
new file mode 100644
index 000000000..df1bdf1fa
--- /dev/null
+++ b/hw/sd/aspeed_sdhci.c
@@ -0,0 +1,213 @@
+/*
+ * Aspeed SD Host Controller
+ * Eddie James <eajames@linux.ibm.com>
+ *
+ * Copyright (C) 2019 IBM Corp
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "qemu/error-report.h"
+#include "hw/sd/aspeed_sdhci.h"
+#include "qapi/error.h"
+#include "hw/irq.h"
+#include "migration/vmstate.h"
+#include "hw/qdev-properties.h"
+#include "trace.h"
+
+#define ASPEED_SDHCI_INFO            0x00
+#define  ASPEED_SDHCI_INFO_SLOT1     (1 << 17)
+#define  ASPEED_SDHCI_INFO_SLOT0     (1 << 16)
+#define  ASPEED_SDHCI_INFO_RESET     (1 << 0)
+#define ASPEED_SDHCI_DEBOUNCE        0x04
+#define  ASPEED_SDHCI_DEBOUNCE_RESET 0x00000005
+#define ASPEED_SDHCI_BUS             0x08
+#define ASPEED_SDHCI_SDIO_140        0x10
+#define ASPEED_SDHCI_SDIO_148        0x18
+#define ASPEED_SDHCI_SDIO_240        0x20
+#define ASPEED_SDHCI_SDIO_248        0x28
+#define ASPEED_SDHCI_WP_POL          0xec
+#define ASPEED_SDHCI_CARD_DET        0xf0
+#define ASPEED_SDHCI_IRQ_STAT        0xfc
+
+#define TO_REG(addr) ((addr) / sizeof(uint32_t))
+
+static uint64_t aspeed_sdhci_read(void *opaque, hwaddr addr, unsigned int size)
+{
+    uint32_t val = 0;
+    AspeedSDHCIState *sdhci = opaque;
+
+    switch (addr) {
+    case ASPEED_SDHCI_SDIO_140:
+        val = (uint32_t)sdhci->slots[0].capareg;
+        break;
+    case ASPEED_SDHCI_SDIO_148:
+        val = (uint32_t)sdhci->slots[0].maxcurr;
+        break;
+    case ASPEED_SDHCI_SDIO_240:
+        val = (uint32_t)sdhci->slots[1].capareg;
+        break;
+    case ASPEED_SDHCI_SDIO_248:
+        val = (uint32_t)sdhci->slots[1].maxcurr;
+        break;
+    default:
+        if (addr < ASPEED_SDHCI_REG_SIZE) {
+            val = sdhci->regs[TO_REG(addr)];
+        } else {
+            qemu_log_mask(LOG_GUEST_ERROR,
+                          "%s: Out-of-bounds read at 0x%" HWADDR_PRIx "\n",
+                          __func__, addr);
+        }
+    }
+
+    trace_aspeed_sdhci_read(addr, size, (uint64_t) val);
+
+    return (uint64_t)val;
+}
+
+static void aspeed_sdhci_write(void *opaque, hwaddr addr, uint64_t val,
+                               unsigned int size)
+{
+    AspeedSDHCIState *sdhci = opaque;
+
+    trace_aspeed_sdhci_write(addr, size, val);
+
+    switch (addr) {
+    case ASPEED_SDHCI_INFO:
+        /* The RESET bit automatically clears. */
+        sdhci->regs[TO_REG(addr)] = (uint32_t)val & ~ASPEED_SDHCI_INFO_RESET;
+        break;
+    case ASPEED_SDHCI_SDIO_140:
+        sdhci->slots[0].capareg = (uint64_t)(uint32_t)val;
+        break;
+    case ASPEED_SDHCI_SDIO_148:
+        sdhci->slots[0].maxcurr = (uint64_t)(uint32_t)val;
+        break;
+    case ASPEED_SDHCI_SDIO_240:
+        sdhci->slots[1].capareg = (uint64_t)(uint32_t)val;
+        break;
+    case ASPEED_SDHCI_SDIO_248:
+        sdhci->slots[1].maxcurr = (uint64_t)(uint32_t)val;
+        break;
+    default:
+        if (addr < ASPEED_SDHCI_REG_SIZE) {
+            sdhci->regs[TO_REG(addr)] = (uint32_t)val;
+        } else {
+            qemu_log_mask(LOG_GUEST_ERROR,
+                          "%s: Out-of-bounds write at 0x%" HWADDR_PRIx "\n",
+                          __func__, addr);
+        }
+    }
+}
+
+static const MemoryRegionOps aspeed_sdhci_ops = {
+    .read = aspeed_sdhci_read,
+    .write = aspeed_sdhci_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .valid.min_access_size = 4,
+    .valid.max_access_size = 4,
+};
+
+static void aspeed_sdhci_set_irq(void *opaque, int n, int level)
+{
+    AspeedSDHCIState *sdhci = opaque;
+
+    if (level) {
+        sdhci->regs[TO_REG(ASPEED_SDHCI_IRQ_STAT)] |= BIT(n);
+
+        qemu_irq_raise(sdhci->irq);
+    } else {
+        sdhci->regs[TO_REG(ASPEED_SDHCI_IRQ_STAT)] &= ~BIT(n);
+
+        qemu_irq_lower(sdhci->irq);
+    }
+}
+
+static void aspeed_sdhci_realize(DeviceState *dev, Error **errp)
+{
+    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
+    AspeedSDHCIState *sdhci = ASPEED_SDHCI(dev);
+
+    /* Create input irqs for the slots */
+    qdev_init_gpio_in_named_with_opaque(DEVICE(sbd), aspeed_sdhci_set_irq,
+                                        sdhci, NULL, sdhci->num_slots);
+
+    sysbus_init_irq(sbd, &sdhci->irq);
+    memory_region_init_io(&sdhci->iomem, OBJECT(sdhci), &aspeed_sdhci_ops,
+                          sdhci, TYPE_ASPEED_SDHCI, 0x1000);
+    sysbus_init_mmio(sbd, &sdhci->iomem);
+
+    for (int i = 0; i < sdhci->num_slots; ++i) {
+        Object *sdhci_slot = OBJECT(&sdhci->slots[i]);
+        SysBusDevice *sbd_slot = SYS_BUS_DEVICE(&sdhci->slots[i]);
+
+        if (!object_property_set_int(sdhci_slot, "sd-spec-version", 2, errp)) {
+            return;
+        }
+
+        if (!object_property_set_uint(sdhci_slot, "capareg",
+                                      ASPEED_SDHCI_CAPABILITIES, errp)) {
+            return;
+        }
+
+        if (!sysbus_realize(sbd_slot, errp)) {
+            return;
+        }
+
+        sysbus_connect_irq(sbd_slot, 0, qdev_get_gpio_in(DEVICE(sbd), i));
+        memory_region_add_subregion(&sdhci->iomem, (i + 1) * 0x100,
+                                    &sdhci->slots[i].iomem);
+    }
+}
+
+static void aspeed_sdhci_reset(DeviceState *dev)
+{
+    AspeedSDHCIState *sdhci = ASPEED_SDHCI(dev);
+
+    memset(sdhci->regs, 0, ASPEED_SDHCI_REG_SIZE);
+
+    sdhci->regs[TO_REG(ASPEED_SDHCI_INFO)] = ASPEED_SDHCI_INFO_SLOT0;
+    if (sdhci->num_slots == 2) {
+        sdhci->regs[TO_REG(ASPEED_SDHCI_INFO)] |= ASPEED_SDHCI_INFO_SLOT1;
+    }
+    sdhci->regs[TO_REG(ASPEED_SDHCI_DEBOUNCE)] = ASPEED_SDHCI_DEBOUNCE_RESET;
+}
+
+static const VMStateDescription vmstate_aspeed_sdhci = {
+    .name = TYPE_ASPEED_SDHCI,
+    .version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32_ARRAY(regs, AspeedSDHCIState, ASPEED_SDHCI_NUM_REGS),
+        VMSTATE_END_OF_LIST(),
+    },
+};
+
+static Property aspeed_sdhci_properties[] = {
+    DEFINE_PROP_UINT8("num-slots", AspeedSDHCIState, num_slots, 0),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void aspeed_sdhci_class_init(ObjectClass *classp, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(classp);
+
+    dc->realize = aspeed_sdhci_realize;
+    dc->reset = aspeed_sdhci_reset;
+    dc->vmsd = &vmstate_aspeed_sdhci;
+    device_class_set_props(dc, aspeed_sdhci_properties);
+}
+
+static TypeInfo aspeed_sdhci_info = {
+    .name          = TYPE_ASPEED_SDHCI,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(AspeedSDHCIState),
+    .class_init    = aspeed_sdhci_class_init,
+};
+
+static void aspeed_sdhci_register_types(void)
+{
+    type_register_static(&aspeed_sdhci_info);
+}
+
+type_init(aspeed_sdhci_register_types)