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* ColdFire Fast Ethernet Controller emulation.
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* Copyright (c) 2007 CodeSourcery.
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* This code is licenced under the GPL
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#define DPRINTF(fmt, args...) \
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do { printf("mcf_fec: " fmt , ##args); } while (0)
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#define DPRINTF(fmt, args...) do {} while(0)
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#define FEC_MAX_FRAME_SIZE 2032
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uint32_t rx_descriptor;
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uint32_t tx_descriptor;
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#define FEC_INT_HB 0x80000000
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#define FEC_INT_BABR 0x40000000
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#define FEC_INT_BABT 0x20000000
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#define FEC_INT_GRA 0x10000000
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#define FEC_INT_TXF 0x08000000
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#define FEC_INT_TXB 0x04000000
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#define FEC_INT_RXF 0x02000000
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#define FEC_INT_RXB 0x01000000
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#define FEC_INT_MII 0x00800000
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#define FEC_INT_EB 0x00400000
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#define FEC_INT_LC 0x00200000
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#define FEC_INT_RL 0x00100000
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#define FEC_INT_UN 0x00080000
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/* Map interrupt flags onto IRQ lines. */
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#define FEC_NUM_IRQ 13
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static const uint32_t mcf_fec_irq_map[FEC_NUM_IRQ] = {
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/* Buffer Descriptor. */
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#define FEC_BD_R 0x8000
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#define FEC_BD_E 0x8000
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#define FEC_BD_O1 0x4000
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#define FEC_BD_W 0x2000
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#define FEC_BD_O2 0x1000
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#define FEC_BD_L 0x0800
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#define FEC_BD_TC 0x0400
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#define FEC_BD_ABC 0x0200
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#define FEC_BD_M 0x0100
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#define FEC_BD_BC 0x0080
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#define FEC_BD_MC 0x0040
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#define FEC_BD_LG 0x0020
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#define FEC_BD_NO 0x0010
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#define FEC_BD_CR 0x0004
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#define FEC_BD_OV 0x0002
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#define FEC_BD_TR 0x0001
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static void mcf_fec_read_bd(mcf_fec_bd *bd, uint32_t addr)
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cpu_physical_memory_read(addr, (uint8_t *)bd, sizeof(*bd));
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be16_to_cpus(&bd->flags);
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be16_to_cpus(&bd->length);
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be32_to_cpus(&bd->data);
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static void mcf_fec_write_bd(mcf_fec_bd *bd, uint32_t addr)
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tmp.flags = cpu_to_be16(bd->flags);
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tmp.length = cpu_to_be16(bd->length);
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tmp.data = cpu_to_be32(bd->data);
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cpu_physical_memory_write(addr, (uint8_t *)&tmp, sizeof(tmp));
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static void mcf_fec_update(mcf_fec_state *s)
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active = s->eir & s->eimr;
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changed = active ^s->irq_state;
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for (i = 0; i < FEC_NUM_IRQ; i++) {
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mask = mcf_fec_irq_map[i];
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if (changed & mask) {
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DPRINTF("IRQ %d = %d\n", i, (active & mask) != 0);
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qemu_set_irq(s->irq[i], (active & mask) != 0);
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s->irq_state = active;
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static void mcf_fec_do_tx(mcf_fec_state *s)
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uint8_t frame[FEC_MAX_FRAME_SIZE];
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addr = s->tx_descriptor;
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mcf_fec_read_bd(&bd, addr);
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DPRINTF("tx_bd %x flags %04x len %d data %08x\n",
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addr, bd.flags, bd.length, bd.data);
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if ((bd.flags & FEC_BD_R) == 0) {
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/* Run out of descriptors to transmit. */
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if (frame_size + len > FEC_MAX_FRAME_SIZE) {
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len = FEC_MAX_FRAME_SIZE - frame_size;
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s->eir |= FEC_INT_BABT;
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cpu_physical_memory_read(bd.data, ptr, len);
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if (bd.flags & FEC_BD_L) {
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/* Last buffer in frame. */
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DPRINTF("Sending packet\n");
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qemu_send_packet(s->vc, frame, len);
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s->eir |= FEC_INT_TXF;
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s->eir |= FEC_INT_TXB;
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bd.flags &= ~FEC_BD_R;
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/* Write back the modified descriptor. */
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mcf_fec_write_bd(&bd, addr);
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/* Advance to the next descriptor. */
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if ((bd.flags & FEC_BD_W) != 0) {
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s->tx_descriptor = addr;
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static void mcf_fec_enable_rx(mcf_fec_state *s)
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mcf_fec_read_bd(&bd, s->rx_descriptor);
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s->rx_enabled = ((bd.flags & FEC_BD_E) != 0);
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DPRINTF("RX buffer full\n");
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static void mcf_fec_reset(mcf_fec_state *s)
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static uint32_t mcf_fec_read(void *opaque, target_phys_addr_t addr)
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mcf_fec_state *s = (mcf_fec_state *)opaque;
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switch (addr & 0x3ff) {
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case 0x004: return s->eir;
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case 0x008: return s->eimr;
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case 0x010: return s->rx_enabled ? (1 << 24) : 0; /* RDAR */
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case 0x014: return 0; /* TDAR */
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case 0x024: return s->ecr;
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case 0x040: return s->mmfr;
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case 0x044: return s->mscr;
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case 0x064: return 0; /* MIBC */
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case 0x084: return s->rcr;
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case 0x0c4: return s->tcr;
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case 0x0e4: /* PALR */
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return (s->macaddr[0] << 24) | (s->macaddr[1] << 16)
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| (s->macaddr[2] << 8) | s->macaddr[3];
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case 0x0e8: /* PAUR */
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return (s->macaddr[4] << 24) | (s->macaddr[5] << 16) | 0x8808;
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case 0x0ec: return 0x10000; /* OPD */
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case 0x118: return 0;
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case 0x11c: return 0;
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case 0x120: return 0;
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case 0x124: return 0;
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case 0x144: return s->tfwr;
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case 0x14c: return 0x600;
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case 0x150: return s->rfsr;
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case 0x180: return s->erdsr;
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case 0x184: return s->etdsr;
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case 0x188: return s->emrbr;
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cpu_abort(cpu_single_env, "mcf_fec_read: Bad address 0x%x\n",
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static void mcf_fec_write(void *opaque, target_phys_addr_t addr, uint32_t value)
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mcf_fec_state *s = (mcf_fec_state *)opaque;
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switch (addr & 0x3ff) {
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case 0x010: /* RDAR */
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if ((s->ecr & FEC_EN) && !s->rx_enabled) {
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DPRINTF("RX enable\n");
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mcf_fec_enable_rx(s);
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case 0x014: /* TDAR */
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if (s->ecr & FEC_EN) {
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if (value & FEC_RESET) {
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if ((s->ecr & FEC_EN) == 0) {
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/* TODO: Implement MII. */
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s->mscr = value & 0xfe;
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/* TODO: Implement MIB. */
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s->rcr = value & 0x07ff003f;
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/* TODO: Implement LOOP mode. */
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case 0x0c4: /* TCR */
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/* We transmit immediately, so raise GRA immediately. */
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s->eir |= FEC_INT_GRA;
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case 0x0e4: /* PALR */
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s->macaddr[0] = value >> 24;
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s->macaddr[1] = value >> 16;
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s->macaddr[2] = value >> 8;
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s->macaddr[3] = value;
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case 0x0e8: /* PAUR */
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s->macaddr[4] = value >> 24;
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s->macaddr[5] = value >> 16;
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/* TODO: implement MAC hash filtering. */
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/* FRBR writes ignored. */
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s->rfsr = (value & 0x3fc) | 0x400;
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s->erdsr = value & ~3;
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s->rx_descriptor = s->erdsr;
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s->etdsr = value & ~3;
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s->tx_descriptor = s->etdsr;
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s->emrbr = value & 0x7f0;
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cpu_abort(cpu_single_env, "mcf_fec_write Bad address 0x%x\n",
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static int mcf_fec_can_receive(void *opaque)
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mcf_fec_state *s = (mcf_fec_state *)opaque;
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return s->rx_enabled;
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static void mcf_fec_receive(void *opaque, const uint8_t *buf, int size)
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mcf_fec_state *s = (mcf_fec_state *)opaque;
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unsigned int buf_len;
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DPRINTF("do_rx len %d\n", size);
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if (!s->rx_enabled) {
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fprintf(stderr, "mcf_fec_receive: Unexpected packet\n");
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/* 4 bytes for the CRC. */
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crc = cpu_to_be32(crc32(~0, buf, size));
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crc_ptr = (uint8_t *)&crc;
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/* Huge frames are truncted. */
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if (size > FEC_MAX_FRAME_SIZE) {
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size = FEC_MAX_FRAME_SIZE;
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flags |= FEC_BD_TR | FEC_BD_LG;
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/* Frames larger than the user limit just set error flags. */
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if (size > (s->rcr >> 16)) {
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addr = s->rx_descriptor;
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mcf_fec_read_bd(&bd, addr);
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if ((bd.flags & FEC_BD_E) == 0) {
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/* No descriptors available. Bail out. */
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/* FIXME: This is wrong. We should probably either save the
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remainder for when more RX buffers are available, or
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fprintf(stderr, "mcf_fec: Lost end of frame\n");
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buf_len = (size <= s->emrbr) ? size: s->emrbr;
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DPRINTF("rx_bd %x length %d\n", addr, bd.length);
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/* The last 4 bytes are the CRC. */
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cpu_physical_memory_write(buf_addr, buf, buf_len);
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cpu_physical_memory_write(buf_addr + buf_len, crc_ptr, 4 - size);
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bd.flags &= ~FEC_BD_E;
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/* Last buffer in frame. */
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bd.flags |= flags | FEC_BD_L;
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DPRINTF("rx frame flags %04x\n", bd.flags);
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s->eir |= FEC_INT_RXF;
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s->eir |= FEC_INT_RXB;
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mcf_fec_write_bd(&bd, addr);
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/* Advance to the next descriptor. */
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if ((bd.flags & FEC_BD_W) != 0) {
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s->rx_descriptor = addr;
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mcf_fec_enable_rx(s);
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static CPUReadMemoryFunc *mcf_fec_readfn[] = {
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static CPUWriteMemoryFunc *mcf_fec_writefn[] = {
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void mcf_fec_init(NICInfo *nd, target_phys_addr_t base, qemu_irq *irq)
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s = (mcf_fec_state *)qemu_mallocz(sizeof(mcf_fec_state));
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iomemtype = cpu_register_io_memory(0, mcf_fec_readfn,
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cpu_register_physical_memory(base, 0x400, iomemtype);
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s->vc = qemu_new_vlan_client(nd->vlan, mcf_fec_receive,
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mcf_fec_can_receive, s);
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memcpy(s->macaddr, nd->macaddr, 6);