Stellaris ethernet support.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3728 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 347 insertions, 0 deletions

diff --git a/hw/stellaris_enet.c b/hw/stellaris_enet.c
new file mode 100644
index 000000000..31711b9d6
--- /dev/null
+++ b/hw/stellaris_enet.c
@@ -0,0 +1,347 @@
+/*
+ * Luminary Micro Stellaris Ethernet Controller
+ *
+ * Copyright (c) 2007 CodeSourcery.
+ * Written by Paul Brook
+ *
+ * This code is licenced under the GPL.
+ */
+#include "hw.h"
+#include "arm-misc.h"
+#include "net.h"
+#include <zlib.h>
+
+//#define DEBUG_STELLARIS_ENET 1
+
+#ifdef DEBUG_STELLARIS_ENET
+#define DPRINTF(fmt, args...) \
+do { printf("stellaris_enet: " fmt , ##args); } while (0)
+#define BADF(fmt, args...) \
+do { fprintf(stderr, "stellaris_enet: error: " fmt , ##args); exit(1);} while (0)
+#else
+#define DPRINTF(fmt, args...) do {} while(0)
+#define BADF(fmt, args...) \
+do { fprintf(stderr, "stellaris_enet: error: " fmt , ##args);} while (0)
+#endif
+
+#define SE_INT_RX       0x01
+#define SE_INT_TXER     0x02
+#define SE_INT_TXEMP    0x04
+#define SE_INT_FOV      0x08
+#define SE_INT_RXER     0x10
+#define SE_INT_MD       0x20
+#define SE_INT_PHY      0x40
+
+#define SE_RCTL_RXEN    0x01
+#define SE_RCTL_AMUL    0x02
+#define SE_RCTL_PRMS    0x04
+#define SE_RCTL_BADCRC  0x08
+#define SE_RCTL_RSTFIFO 0x10
+
+#define SE_TCTL_TXEN    0x01
+#define SE_TCTL_PADEN   0x02
+#define SE_TCTL_CRC     0x04
+#define SE_TCTL_DUPLEX  0x08
+
+typedef struct {
+    uint32_t base;
+    uint32_t ris;
+    uint32_t im;
+    uint32_t rctl;
+    uint32_t tctl;
+    uint32_t thr;
+    uint32_t mctl;
+    uint32_t mdv;
+    uint32_t mtxd;
+    uint32_t mrxd;
+    uint32_t np;
+    int tx_frame_len;
+    int tx_fifo_len;
+    uint8_t tx_fifo[2048];
+    /* Real hardware has a 2k fifo, which works out to be at most 31 packets.
+       We implement a full 31 packet fifo.  */
+    struct {
+        uint8_t data[2048];
+        int len;
+    } rx[31];
+    uint8_t *rx_fifo;
+    int rx_fifo_len;
+    int next_packet;
+    VLANClientState *vc;
+    qemu_irq irq;
+    uint8_t macaddr[6];
+} stellaris_enet_state;
+
+static void stellaris_enet_update(stellaris_enet_state *s)
+{
+    qemu_set_irq(s->irq, (s->ris & s->im) != 0);
+}
+
+/* TODO: Implement MAC address filtering.  */
+static void stellaris_enet_receive(void *opaque, const uint8_t *buf, int size)
+{
+    stellaris_enet_state *s = (stellaris_enet_state *)opaque;
+    int n;
+    uint8_t *p;
+    uint32_t crc;
+
+    if ((s->rctl & SE_RCTL_RXEN) == 0)
+        return;
+    if (s->np >= 31) {
+        DPRINTF("Packet dropped\n");
+        return;
+    }
+
+    DPRINTF("Received packet len=%d\n", size);
+    n = s->next_packet + s->np;
+    if (n >= 31)
+        n -= 31;
+    s->np++;
+
+    s->rx[n].len = size + 6;
+    p = s->rx[n].data;
+    *(p++) = (size + 6);
+    *(p++) = (size + 6) >> 8;
+    memcpy (p, buf, size);
+    p += size;
+    crc = crc32(~0, buf, size);
+    *(p++) = crc;
+    *(p++) = crc >> 8;
+    *(p++) = crc >> 16;
+    *(p++) = crc >> 24;
+    /* Clear the remaining bytes in the last word.  */
+    if ((size & 3) != 2) {
+        memset(p, 0, (6 - size) & 3);
+    }
+
+    s->ris |= SE_INT_RX;
+    stellaris_enet_update(s);
+}
+
+static int stellaris_enet_can_receive(void *opaque)
+{
+    stellaris_enet_state *s = (stellaris_enet_state *)opaque;
+
+    if ((s->rctl & SE_RCTL_RXEN) == 0)
+        return 1;
+
+    return (s->np < 31);
+}
+
+static uint32_t stellaris_enet_read(void *opaque, target_phys_addr_t offset)
+{
+    stellaris_enet_state *s = (stellaris_enet_state *)opaque;
+    uint32_t val;
+
+    offset -= s->base;
+    switch (offset) {
+    case 0x00: /* RIS */
+        DPRINTF("IRQ status %02x\n", s->ris);
+        return s->ris;
+    case 0x04: /* IM */
+        return s->im;
+    case 0x08: /* RCTL */
+        return s->rctl;
+    case 0x0c: /* TCTL */
+        return s->tctl;
+    case 0x10: /* DATA */
+        if (s->rx_fifo_len == 0) {
+            if (s->np == 0) {
+                BADF("RX underflow\n");
+                return 0;
+            }
+            s->rx_fifo_len = s->rx[s->next_packet].len;
+            s->rx_fifo = s->rx[s->next_packet].data;
+            DPRINTF("RX FIFO start packet len=%d\n", s->rx_fifo_len);
+        }
+        val = s->rx_fifo[0] | (s->rx_fifo[1] << 8) | (s->rx_fifo[2] << 16)
+              | (s->rx_fifo[3] << 24);
+        s->rx_fifo += 4;
+        s->rx_fifo_len -= 4;
+        if (s->rx_fifo_len <= 0) {
+            s->rx_fifo_len = 0;
+            s->next_packet++;
+            if (s->next_packet >= 31)
+                s->next_packet = 0;
+            s->np--;
+            DPRINTF("RX done np=%d\n", s->np);
+        }
+        return val;
+    case 0x14: /* IA0 */
+        return s->macaddr[0] | (s->macaddr[1] << 8)
+               | (s->macaddr[2] << 16) | (s->macaddr[3] << 24);
+    case 0x18: /* IA1 */
+        return s->macaddr[4] | (s->macaddr[5] << 8);
+    case 0x1c: /* THR */
+        return s->thr;
+    case 0x20: /* MCTL */
+        return s->mctl;
+    case 0x24: /* MDV */
+        return s->mdv;
+    case 0x28: /* MADD */
+        return 0;
+    case 0x2c: /* MTXD */
+        return s->mtxd;
+    case 0x30: /* MRXD */
+        return s->mrxd;
+    case 0x34: /* NP */
+        return s->np;
+    case 0x38: /* TR */
+        return 0;
+    case 0x3c: /* Undocuented: Timestamp? */
+        return 0;
+    default:
+        cpu_abort (cpu_single_env, "stellaris_enet_read: Bad offset %x\n",
+                   (int)offset);
+        return 0;
+    }
+}
+
+static void stellaris_enet_write(void *opaque, target_phys_addr_t offset,
+                        uint32_t value)
+{
+    stellaris_enet_state *s = (stellaris_enet_state *)opaque;
+
+    offset -= s->base;
+    switch (offset) {
+    case 0x00: /* IACK */
+        s->ris &= ~value;
+        DPRINTF("IRQ ack %02x/%02x\n", value, s->ris);
+        stellaris_enet_update(s);
+        /* Clearing TXER also resets the TX fifo.  */
+        if (value & SE_INT_TXER)
+            s->tx_frame_len = -1;
+        break;
+    case 0x04: /* IM */
+        DPRINTF("IRQ mask %02x/%02x\n", value, s->ris);
+        s->im = value;
+        stellaris_enet_update(s);
+        break;
+    case 0x08: /* RCTL */
+        s->rctl = value;
+        if (value & SE_RCTL_RSTFIFO) {
+            s->rx_fifo_len = 0;
+            s->np = 0;
+            stellaris_enet_update(s);
+        }
+        break;
+    case 0x0c: /* TCTL */
+        s->tctl = value;
+        break;
+    case 0x10: /* DATA */
+        if (s->tx_frame_len == -1) {
+            s->tx_frame_len = value & 0xffff;
+            if (s->tx_frame_len > 2032) {
+                DPRINTF("TX frame too long (%d)\n", s->tx_frame_len);
+                s->tx_frame_len = 0;
+                s->ris |= SE_INT_TXER;
+                stellaris_enet_update(s);
+            } else {
+                DPRINTF("Start TX frame len=%d\n", s->tx_frame_len);
+                /* The value written does not include the ethernet header.  */
+                s->tx_frame_len += 14;
+                if ((s->tctl & SE_TCTL_CRC) == 0)
+                    s->tx_frame_len += 4;
+                s->tx_fifo_len = 0;
+                s->tx_fifo[s->tx_fifo_len++] = value >> 16;
+                s->tx_fifo[s->tx_fifo_len++] = value >> 24;
+            }
+        } else {
+            s->tx_fifo[s->tx_fifo_len++] = value;
+            s->tx_fifo[s->tx_fifo_len++] = value >> 8;
+            s->tx_fifo[s->tx_fifo_len++] = value >> 16;
+            s->tx_fifo[s->tx_fifo_len++] = value >> 24;
+            if (s->tx_fifo_len >= s->tx_frame_len) {
+                /* We don't implement explicit CRC, so just chop it off.  */
+                if ((s->tctl & SE_TCTL_CRC) == 0)
+                    s->tx_frame_len -= 4;
+                if ((s->tctl & SE_TCTL_PADEN) && s->tx_frame_len < 60) {
+                    memset(&s->tx_fifo[s->tx_frame_len], 0, 60 - s->tx_frame_len);
+                    s->tx_fifo_len = 60;
+                }
+                qemu_send_packet(s->vc, s->tx_fifo, s->tx_frame_len);
+                s->tx_frame_len = -1;
+                s->ris |= SE_INT_TXEMP;
+                stellaris_enet_update(s);
+                DPRINTF("Done TX\n");
+            }
+        }
+        break;
+    case 0x14: /* IA0 */
+        s->macaddr[0] = value;
+        s->macaddr[1] = value >> 8;
+        s->macaddr[2] = value >> 16;
+        s->macaddr[3] = value >> 24;
+        break;
+    case 0x18: /* IA1 */
+        s->macaddr[4] = value;
+        s->macaddr[5] = value >> 8;
+        break;
+    case 0x1c: /* THR */
+        s->thr = value;
+        break;
+    case 0x20: /* MCTL */
+        s->mctl = value;
+        break;
+    case 0x24: /* MDV */
+        s->mdv = value;
+        break;
+    case 0x28: /* MADD */
+        /* ignored.  */
+        break;
+    case 0x2c: /* MTXD */
+        s->mtxd = value & 0xff;
+        break;
+    case 0x30: /* MRXD */
+    case 0x34: /* NP */
+    case 0x38: /* TR */
+        /* Ignored.  */
+    case 0x3c: /* Undocuented: Timestamp? */
+        /* Ignored.  */
+        break;
+    default:
+        cpu_abort (cpu_single_env, "stellaris_enet_write: Bad offset %x\n",
+                   (int)offset);
+    }
+}
+
+static CPUReadMemoryFunc *stellaris_enet_readfn[] = {
+   stellaris_enet_read,
+   stellaris_enet_read,
+   stellaris_enet_read
+};
+
+static CPUWriteMemoryFunc *stellaris_enet_writefn[] = {
+   stellaris_enet_write,
+   stellaris_enet_write,
+   stellaris_enet_write
+};
+static void stellaris_enet_reset(stellaris_enet_state *s)
+{
+    s->mdv = 0x80;
+    s->rctl = SE_RCTL_BADCRC;
+    s->im = SE_INT_PHY | SE_INT_MD | SE_INT_RXER | SE_INT_FOV | SE_INT_TXEMP
+            | SE_INT_TXER | SE_INT_RX;
+    s->thr = 0x3f;
+    s->tx_frame_len = -1;
+}
+
+void stellaris_enet_init(NICInfo *nd, uint32_t base, qemu_irq irq)
+{
+    stellaris_enet_state *s;
+    int iomemtype;
+
+    s = (stellaris_enet_state *)qemu_mallocz(sizeof(stellaris_enet_state));
+    iomemtype = cpu_register_io_memory(0, stellaris_enet_readfn,
+                                       stellaris_enet_writefn, s);
+    cpu_register_physical_memory(base, 0x00001000, iomemtype);
+    s->base = base;
+    s->irq = irq;
+    memcpy(s->macaddr, nd->macaddr, 6);
+
+    if (nd->vlan)
+        s->vc = qemu_new_vlan_client(nd->vlan, stellaris_enet_receive,
+                                     stellaris_enet_can_receive, s);
+
+    stellaris_enet_reset(s);
+}