Add ENET/Gbps Ethernet support to FEC device

The ENET device (present in i.MX6) is "derived" from FEC and backward
compatible with it.

This patch adds the necessary support of the added feature in the ENET
device to allow Linux to use it (on supported processors).

Signed-off-by: Jean-Christophe Dubois <jcd@tribudubois.net>
Signed-off-by: Jason Wang <jasowang@redhat.com>

1 files changed, 572 insertions, 101 deletions

diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c
index d8e414571a..d91e029382 100644
--- a/hw/net/imx_fec.c
+++ b/hw/net/imx_fec.c
@@ -25,6 +25,8 @@
 #include "hw/net/imx_fec.h"
 #include "sysemu/dma.h"
 #include "qemu/log.h"
+#include "net/checksum.h"
+#include "net/eth.h"
 
 /* For crc32 */
 #include <zlib.h>
@@ -53,10 +55,93 @@
         } \
     } while (0)
 
-static const char *imx_fec_reg_name(IMXFECState *s, uint32_t index)
+static const char *imx_default_reg_name(IMXFECState *s, uint32_t index)
 {
     static char tmp[20];
+    sprintf(tmp, "index %d", index);
+    return tmp;
+}
+
+static const char *imx_fec_reg_name(IMXFECState *s, uint32_t index)
+{
+    switch (index) {
+    case ENET_FRBR:
+        return "FRBR";
+    case ENET_FRSR:
+        return "FRSR";
+    case ENET_MIIGSK_CFGR:
+        return "MIIGSK_CFGR";
+    case ENET_MIIGSK_ENR:
+        return "MIIGSK_ENR";
+    default:
+        return imx_default_reg_name(s, index);
+    }
+}
+
+static const char *imx_enet_reg_name(IMXFECState *s, uint32_t index)
+{
+    switch (index) {
+    case ENET_RSFL:
+        return "RSFL";
+    case ENET_RSEM:
+        return "RSEM";
+    case ENET_RAEM:
+        return "RAEM";
+    case ENET_RAFL:
+        return "RAFL";
+    case ENET_TSEM:
+        return "TSEM";
+    case ENET_TAEM:
+        return "TAEM";
+    case ENET_TAFL:
+        return "TAFL";
+    case ENET_TIPG:
+        return "TIPG";
+    case ENET_FTRL:
+        return "FTRL";
+    case ENET_TACC:
+        return "TACC";
+    case ENET_RACC:
+        return "RACC";
+    case ENET_ATCR:
+        return "ATCR";
+    case ENET_ATVR:
+        return "ATVR";
+    case ENET_ATOFF:
+        return "ATOFF";
+    case ENET_ATPER:
+        return "ATPER";
+    case ENET_ATCOR:
+        return "ATCOR";
+    case ENET_ATINC:
+        return "ATINC";
+    case ENET_ATSTMP:
+        return "ATSTMP";
+    case ENET_TGSR:
+        return "TGSR";
+    case ENET_TCSR0:
+        return "TCSR0";
+    case ENET_TCCR0:
+        return "TCCR0";
+    case ENET_TCSR1:
+        return "TCSR1";
+    case ENET_TCCR1:
+        return "TCCR1";
+    case ENET_TCSR2:
+        return "TCSR2";
+    case ENET_TCCR2:
+        return "TCCR2";
+    case ENET_TCSR3:
+        return "TCSR3";
+    case ENET_TCCR3:
+        return "TCCR3";
+    default:
+        return imx_default_reg_name(s, index);
+    }
+}
 
+static const char *imx_eth_reg_name(IMXFECState *s, uint32_t index)
+{
     switch (index) {
     case ENET_EIR:
         return "EIR";
@@ -100,21 +185,16 @@ static const char *imx_fec_reg_name(IMXFECState *s, uint32_t index)
         return "TDSR";
     case ENET_MRBR:
         return "MRBR";
-    case ENET_FRBR:
-        return "FRBR";
-    case ENET_FRSR:
-        return "FRSR";
-    case ENET_MIIGSK_CFGR:
-        return "MIIGSK_CFGR";
-    case ENET_MIIGSK_ENR:
-        return "MIIGSK_ENR";
     default:
-        sprintf(tmp, "index %d", index);
-        return tmp;
+        if (s->is_fec) {
+            return imx_fec_reg_name(s, index);
+        } else {
+            return imx_enet_reg_name(s, index);
+        }
     }
 }
 
-static const VMStateDescription vmstate_imx_fec = {
+static const VMStateDescription vmstate_imx_eth = {
     .name = TYPE_IMX_FEC,
     .version_id = 2,
     .minimum_version_id = 2,
@@ -140,7 +220,7 @@ static const VMStateDescription vmstate_imx_fec = {
 #define PHY_INT_PARFAULT            (1 << 2)
 #define PHY_INT_AUTONEG_PAGE        (1 << 1)
 
-static void imx_fec_update(IMXFECState *s);
+static void imx_eth_update(IMXFECState *s);
 
 /*
  * The MII phy could raise a GPIO to the processor which in turn
@@ -150,7 +230,7 @@ static void imx_fec_update(IMXFECState *s);
  */
 static void phy_update_irq(IMXFECState *s)
 {
-    imx_fec_update(s);
+    imx_eth_update(s);
 }
 
 static void phy_update_link(IMXFECState *s)
@@ -169,7 +249,7 @@ static void phy_update_link(IMXFECState *s)
     phy_update_irq(s);
 }
 
-static void imx_fec_set_link(NetClientState *nc)
+static void imx_eth_set_link(NetClientState *nc)
 {
     phy_update_link(IMX_FEC(qemu_get_nic_opaque(nc)));
 }
@@ -295,14 +375,28 @@ static void imx_fec_write_bd(IMXFECBufDesc *bd, dma_addr_t addr)
     dma_memory_write(&address_space_memory, addr, bd, sizeof(*bd));
 }
 
-static void imx_fec_update(IMXFECState *s)
+static void imx_enet_read_bd(IMXENETBufDesc *bd, dma_addr_t addr)
+{
+    dma_memory_read(&address_space_memory, addr, bd, sizeof(*bd));
+}
+
+static void imx_enet_write_bd(IMXENETBufDesc *bd, dma_addr_t addr)
 {
-    if (s->regs[ENET_EIR] & s->regs[ENET_EIMR]) {
-        FEC_PRINTF("interrupt raised\n");
-        qemu_set_irq(s->irq, 1);
+    dma_memory_write(&address_space_memory, addr, bd, sizeof(*bd));
+}
+
+static void imx_eth_update(IMXFECState *s)
+{
+    if (s->regs[ENET_EIR] & s->regs[ENET_EIMR] & ENET_INT_TS_TIMER) {
+        qemu_set_irq(s->irq[1], 1);
+    } else {
+        qemu_set_irq(s->irq[1], 0);
+    }
+
+    if (s->regs[ENET_EIR] & s->regs[ENET_EIMR] & ENET_INT_MAC) {
+        qemu_set_irq(s->irq[0], 1);
     } else {
-        FEC_PRINTF("interrupt lowered\n");
-        qemu_set_irq(s->irq, 0);
+        qemu_set_irq(s->irq[0], 0);
     }
 }
 
@@ -322,6 +416,7 @@ static void imx_fec_do_tx(IMXFECState *s)
                    addr, bd.flags, bd.length, bd.data);
         if ((bd.flags & ENET_BD_R) == 0) {
             /* Run out of descriptors to transmit.  */
+            FEC_PRINTF("tx_bd ran out of descriptors to transmit\n");
             break;
         }
         len = bd.length;
@@ -353,10 +448,90 @@ static void imx_fec_do_tx(IMXFECState *s)
 
     s->tx_descriptor = addr;
 
-    imx_fec_update(s);
+    imx_eth_update(s);
+}
+
+static void imx_enet_do_tx(IMXFECState *s)
+{
+    int frame_size = 0;
+    uint8_t frame[ENET_MAX_FRAME_SIZE];
+    uint8_t *ptr = frame;
+    uint32_t addr = s->tx_descriptor;
+
+    while (1) {
+        IMXENETBufDesc bd;
+        int len;
+
+        imx_enet_read_bd(&bd, addr);
+        FEC_PRINTF("tx_bd %x flags %04x len %d data %08x option %04x "
+                   "status %04x\n", addr, bd.flags, bd.length, bd.data,
+                   bd.option, bd.status);
+        if ((bd.flags & ENET_BD_R) == 0) {
+            /* Run out of descriptors to transmit.  */
+            break;
+        }
+        len = bd.length;
+        if (frame_size + len > ENET_MAX_FRAME_SIZE) {
+            len = ENET_MAX_FRAME_SIZE - frame_size;
+            s->regs[ENET_EIR] |= ENET_INT_BABT;
+        }
+        dma_memory_read(&address_space_memory, bd.data, ptr, len);
+        ptr += len;
+        frame_size += len;
+        if (bd.flags & ENET_BD_L) {
+            if (bd.option & ENET_BD_PINS) {
+                struct ip_header *ip_hd = PKT_GET_IP_HDR(frame);
+                if (IP_HEADER_VERSION(ip_hd) == 4) {
+                    net_checksum_calculate(frame, frame_size);
+                }
+            }
+            if (bd.option & ENET_BD_IINS) {
+                struct ip_header *ip_hd = PKT_GET_IP_HDR(frame);
+                /* We compute checksum only for IPv4 frames */
+                if (IP_HEADER_VERSION(ip_hd) == 4) {
+                    uint16_t csum;
+                    ip_hd->ip_sum = 0;
+                    csum = net_raw_checksum((uint8_t *)ip_hd, sizeof(*ip_hd));
+                    ip_hd->ip_sum = cpu_to_be16(csum);
+                }
+            }
+            /* Last buffer in frame.  */
+            qemu_send_packet(qemu_get_queue(s->nic), frame, len);
+            ptr = frame;
+            frame_size = 0;
+            if (bd.option & ENET_BD_TX_INT) {
+                s->regs[ENET_EIR] |= ENET_INT_TXF;
+            }
+        }
+        if (bd.option & ENET_BD_TX_INT) {
+            s->regs[ENET_EIR] |= ENET_INT_TXB;
+        }
+        bd.flags &= ~ENET_BD_R;
+        /* Write back the modified descriptor.  */
+        imx_enet_write_bd(&bd, addr);
+        /* Advance to the next descriptor.  */
+        if ((bd.flags & ENET_BD_W) != 0) {
+            addr = s->regs[ENET_TDSR];
+        } else {
+            addr += sizeof(bd);
+        }
+    }
+
+    s->tx_descriptor = addr;
+
+    imx_eth_update(s);
+}
+
+static void imx_eth_do_tx(IMXFECState *s)
+{
+    if (!s->is_fec && (s->regs[ENET_ECR] & ENET_ECR_EN1588)) {
+        imx_enet_do_tx(s);
+    } else {
+        imx_fec_do_tx(s);
+    }
 }
 
-static void imx_fec_enable_rx(IMXFECState *s)
+static void imx_eth_enable_rx(IMXFECState *s)
 {
     IMXFECBufDesc bd;
     bool tmp;
@@ -374,11 +549,11 @@ static void imx_fec_enable_rx(IMXFECState *s)
     s->regs[ENET_RDAR] = tmp ? ENET_RDAR_RDAR : 0;
 }
 
-static void imx_fec_reset(DeviceState *d)
+static void imx_eth_reset(DeviceState *d)
 {
     IMXFECState *s = IMX_FEC(d);
 
-    /* Reset the FEC */
+    /* Reset the Device */
     memset(s->regs, 0, sizeof(s->regs));
     s->regs[ENET_ECR]   = 0xf0000000;
     s->regs[ENET_MIBC]  = 0xc0000000;
@@ -393,9 +568,19 @@ static void imx_fec_reset(DeviceState *d)
                           | (s->conf.macaddr.a[5] << 16)
                           | 0x8808;
 
-    s->regs[ENET_FRBR]  = 0x00000600;
-    s->regs[ENET_FRSR]  = 0x00000500;
-    s->regs[ENET_MIIGSK_ENR]  = 0x00000006;
+    if (s->is_fec) {
+        s->regs[ENET_FRBR]  = 0x00000600;
+        s->regs[ENET_FRSR]  = 0x00000500;
+        s->regs[ENET_MIIGSK_ENR]  = 0x00000006;
+    } else {
+        s->regs[ENET_RAEM]  = 0x00000004;
+        s->regs[ENET_RAFL]  = 0x00000004;
+        s->regs[ENET_TAEM]  = 0x00000004;
+        s->regs[ENET_TAFL]  = 0x00000008;
+        s->regs[ENET_TIPG]  = 0x0000000c;
+        s->regs[ENET_FTRL]  = 0x000007ff;
+        s->regs[ENET_ATPER] = 0x3b9aca00;
+    }
 
     s->rx_descriptor = 0;
     s->tx_descriptor = 0;
@@ -404,11 +589,67 @@ static void imx_fec_reset(DeviceState *d)
     phy_reset(s);
 }
 
-static uint64_t imx_fec_read(void *opaque, hwaddr addr, unsigned size)
+static uint32_t imx_default_read(IMXFECState *s, uint32_t index)
+{
+    qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%"
+                  PRIx32 "\n", TYPE_IMX_FEC, __func__, index * 4);
+    return 0;
+}
+
+static uint32_t imx_fec_read(IMXFECState *s, uint32_t index)
+{
+    switch (index) {
+    case ENET_FRBR:
+    case ENET_FRSR:
+    case ENET_MIIGSK_CFGR:
+    case ENET_MIIGSK_ENR:
+        return s->regs[index];
+    default:
+        return imx_default_read(s, index);
+    }
+}
+
+static uint32_t imx_enet_read(IMXFECState *s, uint32_t index)
+{
+    switch (index) {
+    case ENET_RSFL:
+    case ENET_RSEM:
+    case ENET_RAEM:
+    case ENET_RAFL:
+    case ENET_TSEM:
+    case ENET_TAEM:
+    case ENET_TAFL:
+    case ENET_TIPG:
+    case ENET_FTRL:
+    case ENET_TACC:
+    case ENET_RACC:
+    case ENET_ATCR:
+    case ENET_ATVR:
+    case ENET_ATOFF:
+    case ENET_ATPER:
+    case ENET_ATCOR:
+    case ENET_ATINC:
+    case ENET_ATSTMP:
+    case ENET_TGSR:
+    case ENET_TCSR0:
+    case ENET_TCCR0:
+    case ENET_TCSR1:
+    case ENET_TCCR1:
+    case ENET_TCSR2:
+    case ENET_TCCR2:
+    case ENET_TCSR3:
+    case ENET_TCCR3:
+        return s->regs[index];
+    default:
+        return imx_default_read(s, index);
+    }
+}
+
+static uint64_t imx_eth_read(void *opaque, hwaddr offset, unsigned size)
 {
     uint32_t value = 0;
     IMXFECState *s = IMX_FEC(opaque);
-    uint32_t index = addr >> 2;
+    uint32_t index = offset >> 2;
 
     switch (index) {
     case ENET_EIR:
@@ -432,32 +673,126 @@ static uint64_t imx_fec_read(void *opaque, hwaddr addr, unsigned size)
     case ENET_RDSR:
     case ENET_TDSR:
     case ENET_MRBR:
-    case ENET_FRBR:
-    case ENET_FRSR:
-    case ENET_MIIGSK_CFGR:
-    case ENET_MIIGSK_ENR:
         value = s->regs[index];
         break;
     default:
-        qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%"
-                      PRIx32 "\n", TYPE_IMX_FEC, __func__, index * 4);
+        if (s->is_fec) {
+            value = imx_fec_read(s, index);
+        } else {
+            value = imx_enet_read(s, index);
+        }
         break;
     }
 
-    FEC_PRINTF("reg[%s] => 0x%" PRIx32 "\n", imx_fec_reg_name(s, index),
+    FEC_PRINTF("reg[%s] => 0x%" PRIx32 "\n", imx_eth_reg_name(s, index),
                                               value);
 
     return value;
 }
 
-static void imx_fec_write(void *opaque, hwaddr addr,
-                          uint64_t value, unsigned size)
+static void imx_default_write(IMXFECState *s, uint32_t index, uint32_t value)
+{
+    qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad address at offset 0x%"
+                  PRIx32 "\n", TYPE_IMX_FEC, __func__, index * 4);
+    return;
+}
+
+static void imx_fec_write(IMXFECState *s, uint32_t index, uint32_t value)
+{
+    switch (index) {
+    case ENET_FRBR:
+        /* FRBR is read only */
+        qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Register FRBR is read only\n",
+                      TYPE_IMX_FEC, __func__);
+        break;
+    case ENET_FRSR:
+        s->regs[index] = (value & 0x000003fc) | 0x00000400;
+        break;
+    case ENET_MIIGSK_CFGR:
+        s->regs[index] = value & 0x00000053;
+        break;
+    case ENET_MIIGSK_ENR:
+        s->regs[index] = (value & 0x00000002) ? 0x00000006 : 0;
+        break;
+    default:
+        imx_default_write(s, index, value);
+        break;
+    }
+}
+
+static void imx_enet_write(IMXFECState *s, uint32_t index, uint32_t value)
+{
+    switch (index) {
+    case ENET_RSFL:
+    case ENET_RSEM:
+    case ENET_RAEM:
+    case ENET_RAFL:
+    case ENET_TSEM:
+    case ENET_TAEM:
+    case ENET_TAFL:
+        s->regs[index] = value & 0x000001ff;
+        break;
+    case ENET_TIPG:
+        s->regs[index] = value & 0x0000001f;
+        break;
+    case ENET_FTRL:
+        s->regs[index] = value & 0x00003fff;
+        break;
+    case ENET_TACC:
+        s->regs[index] = value & 0x00000019;
+        break;
+    case ENET_RACC:
+        s->regs[index] = value & 0x000000C7;
+        break;
+    case ENET_ATCR:
+        s->regs[index] = value & 0x00002a9d;
+        break;
+    case ENET_ATVR:
+    case ENET_ATOFF:
+    case ENET_ATPER:
+        s->regs[index] = value;
+        break;
+    case ENET_ATSTMP:
+        /* ATSTMP is read only */
+        qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Register ATSTMP is read only\n",
+                      TYPE_IMX_FEC, __func__);
+        break;
+    case ENET_ATCOR:
+        s->regs[index] = value & 0x7fffffff;
+        break;
+    case ENET_ATINC:
+        s->regs[index] = value & 0x00007f7f;
+        break;
+    case ENET_TGSR:
+        /* implement clear timer flag */
+        value = value & 0x0000000f;
+        break;
+    case ENET_TCSR0:
+    case ENET_TCSR1:
+    case ENET_TCSR2:
+    case ENET_TCSR3:
+        value = value & 0x000000fd;
+        break;
+    case ENET_TCCR0:
+    case ENET_TCCR1:
+    case ENET_TCCR2:
+    case ENET_TCCR3:
+        s->regs[index] = value;
+        break;
+    default:
+        imx_default_write(s, index, value);
+        break;
+    }
+}
+
+static void imx_eth_write(void *opaque, hwaddr offset, uint64_t value,
+                           unsigned size)
 {
     IMXFECState *s = IMX_FEC(opaque);
-    uint32_t index = addr >> 2;
+    uint32_t index = offset >> 2;
 
-    FEC_PRINTF("reg[%s] <= 0x%" PRIx32 "\n", imx_fec_reg_name(s, index),
-                                             (uint32_t)value);
+    FEC_PRINTF("reg[%s] <= 0x%" PRIx32 "\n", imx_eth_reg_name(s, index),
+                (uint32_t)value);
 
     switch (index) {
     case ENET_EIR:
@@ -470,7 +805,7 @@ static void imx_fec_write(void *opaque, hwaddr addr,
         if (s->regs[ENET_ECR] & ENET_ECR_ETHEREN) {
             if (!s->regs[index]) {
                 s->regs[index] = ENET_RDAR_RDAR;
-                imx_fec_enable_rx(s);
+                imx_eth_enable_rx(s);
             }
         } else {
             s->regs[index] = 0;
@@ -479,13 +814,13 @@ static void imx_fec_write(void *opaque, hwaddr addr,
     case ENET_TDAR:
         if (s->regs[ENET_ECR] & ENET_ECR_ETHEREN) {
             s->regs[index] = ENET_TDAR_TDAR;
-            imx_fec_do_tx(s);
+            imx_eth_do_tx(s);
         }
         s->regs[index] = 0;
         break;
     case ENET_ECR:
         if (value & ENET_ECR_RESET) {
-            return imx_fec_reset(DEVICE(s));
+            return imx_eth_reset(DEVICE(s));
         }
         s->regs[index] = value;
         if ((s->regs[index] & ENET_ECR_ETHEREN) == 0) {
@@ -550,46 +885,49 @@ static void imx_fec_write(void *opaque, hwaddr addr,
         /* TODO: implement MAC hash filtering.  */
         break;
     case ENET_TFWR:
-        s->regs[index] = value & 3;
-        break;
-    case ENET_FRBR:
-        /* FRBR is read only */
-        qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Register FRBR is read only\n",
-                      TYPE_IMX_FEC, __func__);
-        break;
-    case ENET_FRSR:
-        s->regs[index] = (value & 0x000003fc) | 0x00000400;
+        if (s->is_fec) {
+            s->regs[index] = value & 0x3;
+        } else {
+            s->regs[index] = value & 0x13f;
+        }
         break;
     case ENET_RDSR:
-        s->regs[index] = value & ~3;
+        if (s->is_fec) {
+            s->regs[index] = value & ~3;
+        } else {
+            s->regs[index] = value & ~7;
+        }
         s->rx_descriptor = s->regs[index];
         break;
     case ENET_TDSR:
-        s->regs[index] = value & ~3;
+        if (s->is_fec) {
+            s->regs[index] = value & ~3;
+        } else {
+            s->regs[index] = value & ~7;
+        }
         s->tx_descriptor = s->regs[index];
         break;
     case ENET_MRBR:
-        s->regs[index] = value & 0x000007f0;
-        break;
-    case ENET_MIIGSK_CFGR:
-        s->regs[index] = value & 0x00000053;
-        break;
-    case ENET_MIIGSK_ENR:
-        s->regs[index] = (value & 0x00000002) ? 0x00000006 : 0;
+        s->regs[index] = value & 0x00003ff0;
         break;
     default:
-        qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad address at offset 0x%"
-                      PRIx32 "\n", TYPE_IMX_FEC, __func__, index * 4);
-        break;
+        if (s->is_fec) {
+            imx_fec_write(s, index, value);
+        } else {
+            imx_enet_write(s, index, value);
+        }
+        return;
     }
 
-    imx_fec_update(s);
+    imx_eth_update(s);
 }
 
-static int imx_fec_can_receive(NetClientState *nc)
+static int imx_eth_can_receive(NetClientState *nc)
 {
     IMXFECState *s = IMX_FEC(qemu_get_nic_opaque(nc));
 
+    FEC_PRINTF("\n");
+
     return s->regs[ENET_RDAR] ? 1 : 0;
 }
 
@@ -619,7 +957,7 @@ static ssize_t imx_fec_receive(NetClientState *nc, const uint8_t *buf,
     crc = cpu_to_be32(crc32(~0, buf, size));
     crc_ptr = (uint8_t *) &crc;
 
-    /* Huge frames are truncted.  */
+    /* Huge frames are truncated.  */
     if (size > ENET_MAX_FRAME_SIZE) {
         size = ENET_MAX_FRAME_SIZE;
         flags |= ENET_BD_TR | ENET_BD_LG;
@@ -680,81 +1018,214 @@ static ssize_t imx_fec_receive(NetClientState *nc, const uint8_t *buf,
         }
     }
     s->rx_descriptor = addr;
-    imx_fec_enable_rx(s);
-    imx_fec_update(s);
+    imx_eth_enable_rx(s);
+    imx_eth_update(s);
+    return len;
+}
+
+static ssize_t imx_enet_receive(NetClientState *nc, const uint8_t *buf,
+                                size_t len)
+{
+    IMXFECState *s = IMX_FEC(qemu_get_nic_opaque(nc));
+    IMXENETBufDesc bd;
+    uint32_t flags = 0;
+    uint32_t addr;
+    uint32_t crc;
+    uint32_t buf_addr;
+    uint8_t *crc_ptr;
+    unsigned int buf_len;
+    size_t size = len;
+
+    FEC_PRINTF("len %d\n", (int)size);
+
+    if (!s->regs[ENET_RDAR]) {
+        qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Unexpected packet\n",
+                      TYPE_IMX_FEC, __func__);
+        return 0;
+    }
+
+    /* 4 bytes for the CRC.  */
+    size += 4;
+    crc = cpu_to_be32(crc32(~0, buf, size));
+    crc_ptr = (uint8_t *) &crc;
+
+    /* Huge frames are truncted.  */
+    if (size > ENET_MAX_FRAME_SIZE) {
+        size = ENET_MAX_FRAME_SIZE;
+        flags |= ENET_BD_TR | ENET_BD_LG;
+    }
+
+    /* Frames larger than the user limit just set error flags.  */
+    if (size > (s->regs[ENET_RCR] >> 16)) {
+        flags |= ENET_BD_LG;
+    }
+
+    addr = s->rx_descriptor;
+    while (size > 0) {
+        imx_enet_read_bd(&bd, addr);
+        if ((bd.flags & ENET_BD_E) == 0) {
+            /* No descriptors available.  Bail out.  */
+            /*
+             * FIXME: This is wrong. We should probably either
+             * save the remainder for when more RX buffers are
+             * available, or flag an error.
+             */
+            qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Lost end of frame\n",
+                          TYPE_IMX_FEC, __func__);
+            break;
+        }
+        buf_len = (size <= s->regs[ENET_MRBR]) ? size : s->regs[ENET_MRBR];
+        bd.length = buf_len;
+        size -= buf_len;
+
+        FEC_PRINTF("rx_bd 0x%x length %d\n", addr, bd.length);
+
+        /* The last 4 bytes are the CRC.  */
+        if (size < 4) {
+            buf_len += size - 4;
+        }
+        buf_addr = bd.data;
+        dma_memory_write(&address_space_memory, buf_addr, buf, buf_len);
+        buf += buf_len;
+        if (size < 4) {
+            dma_memory_write(&address_space_memory, buf_addr + buf_len,
+                             crc_ptr, 4 - size);
+            crc_ptr += 4 - size;
+        }
+        bd.flags &= ~ENET_BD_E;
+        if (size == 0) {
+            /* Last buffer in frame.  */
+            bd.flags |= flags | ENET_BD_L;
+            FEC_PRINTF("rx frame flags %04x\n", bd.flags);
+            if (bd.option & ENET_BD_RX_INT) {
+                s->regs[ENET_EIR] |= ENET_INT_RXF;
+            }
+        } else {
+            if (bd.option & ENET_BD_RX_INT) {
+                s->regs[ENET_EIR] |= ENET_INT_RXB;
+            }
+        }
+        imx_enet_write_bd(&bd, addr);
+        /* Advance to the next descriptor.  */
+        if ((bd.flags & ENET_BD_W) != 0) {
+            addr = s->regs[ENET_RDSR];
+        } else {
+            addr += sizeof(bd);
+        }
+    }
+    s->rx_descriptor = addr;
+    imx_eth_enable_rx(s);
+    imx_eth_update(s);
     return len;
 }
 
-static const MemoryRegionOps imx_fec_ops = {
-    .read = imx_fec_read,
-    .write = imx_fec_write,
+static ssize_t imx_eth_receive(NetClientState *nc, const uint8_t *buf,
+                                size_t len)
+{
+    IMXFECState *s = IMX_FEC(qemu_get_nic_opaque(nc));
+
+    if (!s->is_fec && (s->regs[ENET_ECR] & ENET_ECR_EN1588)) {
+        return imx_enet_receive(nc, buf, len);
+    } else {
+        return imx_fec_receive(nc, buf, len);
+    }
+}
+
+static const MemoryRegionOps imx_eth_ops = {
+    .read                  = imx_eth_read,
+    .write                 = imx_eth_write,
     .valid.min_access_size = 4,
     .valid.max_access_size = 4,
-    .endianness = DEVICE_NATIVE_ENDIAN,
+    .endianness            = DEVICE_NATIVE_ENDIAN,
 };
 
-static void imx_fec_cleanup(NetClientState *nc)
+static void imx_eth_cleanup(NetClientState *nc)
 {
     IMXFECState *s = IMX_FEC(qemu_get_nic_opaque(nc));
 
     s->nic = NULL;
 }
 
-static NetClientInfo net_imx_fec_info = {
-    .type = NET_CLIENT_OPTIONS_KIND_NIC,
-    .size = sizeof(NICState),
-    .can_receive = imx_fec_can_receive,
-    .receive = imx_fec_receive,
-    .cleanup = imx_fec_cleanup,
-    .link_status_changed = imx_fec_set_link,
+static NetClientInfo imx_eth_net_info = {
+    .type                = NET_CLIENT_OPTIONS_KIND_NIC,
+    .size                = sizeof(NICState),
+    .can_receive         = imx_eth_can_receive,
+    .receive             = imx_eth_receive,
+    .cleanup             = imx_eth_cleanup,
+    .link_status_changed = imx_eth_set_link,
 };
 
 
-static void imx_fec_realize(DeviceState *dev, Error **errp)
+static void imx_eth_realize(DeviceState *dev, Error **errp)
 {
     IMXFECState *s = IMX_FEC(dev);
     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 
-    memory_region_init_io(&s->iomem, OBJECT(dev), &imx_fec_ops, s,
+    memory_region_init_io(&s->iomem, OBJECT(dev), &imx_eth_ops, s,
                           TYPE_IMX_FEC, 0x400);
     sysbus_init_mmio(sbd, &s->iomem);
-    sysbus_init_irq(sbd, &s->irq);
+    sysbus_init_irq(sbd, &s->irq[0]);
+    sysbus_init_irq(sbd, &s->irq[1]);
+
     qemu_macaddr_default_if_unset(&s->conf.macaddr);
 
     s->conf.peers.ncs[0] = nd_table[0].netdev;
 
-    s->nic = qemu_new_nic(&net_imx_fec_info, &s->conf,
-                          object_get_typename(OBJECT(dev)), DEVICE(dev)->id,
-                          s);
+    s->nic = qemu_new_nic(&imx_eth_net_info, &s->conf,
+                          object_get_typename(OBJECT(dev)),
+                          DEVICE(dev)->id, s);
+
     qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
 }
 
-static Property imx_fec_properties[] = {
+static Property imx_eth_properties[] = {
     DEFINE_NIC_PROPERTIES(IMXFECState, conf),
     DEFINE_PROP_END_OF_LIST(),
 };
 
-static void imx_fec_class_init(ObjectClass *klass, void *data)
+static void imx_eth_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
 
-    dc->vmsd = &vmstate_imx_fec;
-    dc->reset = imx_fec_reset;
-    dc->props = imx_fec_properties;
-    dc->realize = imx_fec_realize;
-    dc->desc = "i.MX FEC Ethernet Controller";
+    dc->vmsd    = &vmstate_imx_eth;
+    dc->reset   = imx_eth_reset;
+    dc->props   = imx_eth_properties;
+    dc->realize = imx_eth_realize;
+    dc->desc    = "i.MX FEC/ENET Ethernet Controller";
+}
+
+static void imx_fec_init(Object *obj)
+{
+    IMXFECState *s = IMX_FEC(obj);
+
+    s->is_fec = true;
+}
+
+static void imx_enet_init(Object *obj)
+{
+    IMXFECState *s = IMX_FEC(obj);
+
+    s->is_fec = false;
 }
 
 static const TypeInfo imx_fec_info = {
-    .name = TYPE_IMX_FEC,
-    .parent = TYPE_SYS_BUS_DEVICE,
+    .name          = TYPE_IMX_FEC,
+    .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(IMXFECState),
-    .class_init = imx_fec_class_init,
+    .instance_init = imx_fec_init,
+    .class_init    = imx_eth_class_init,
+};
+
+static const TypeInfo imx_enet_info = {
+    .name          = TYPE_IMX_ENET,
+    .parent        = TYPE_IMX_FEC,
+    .instance_init = imx_enet_init,
 };
 
-static void imx_fec_register_types(void)
+static void imx_eth_register_types(void)
 {
     type_register_static(&imx_fec_info);
+    type_register_static(&imx_enet_info);
 }
 
-type_init(imx_fec_register_types)
+type_init(imx_eth_register_types)