3 * Reinhard Meyer, EMK Elektronik, reinhard.meyer@emk-elektronik.de
4 * Martin Krause, Martin.Krause@tqs.de
5 * reworked original enc28j60.c
7 * SPDX-License-Identifier: GPL-2.0+
19 * IMPORTANT: spi_claim_bus() and spi_release_bus()
20 * are called at begin and end of each of the following functions:
21 * enc_miiphy_read(), enc_miiphy_write(), enc_write_hwaddr(),
22 * enc_init(), enc_recv(), enc_send(), enc_halt()
23 * ALL other functions assume that the bus has already been claimed!
24 * Since NetReceive() might call enc_send() in return, the bus must be
25 * released, NetReceive() called and claimed again.
29 * Controller memory layout.
30 * We only allow 1 frame for transmission and reserve the rest
31 * for reception to handle as many broadcast packets as possible.
32 * Also use the memory from 0x0000 for receiver buffer. See errata pt. 5
33 * 0x0000 - 0x19ff 6656 bytes receive buffer
34 * 0x1a00 - 0x1fff 1536 bytes transmit buffer =
35 * control(1)+frame(1518)+status(7)+reserve(10).
37 #define ENC_RX_BUF_START 0x0000
38 #define ENC_RX_BUF_END 0x19ff
39 #define ENC_TX_BUF_START 0x1a00
40 #define ENC_TX_BUF_END 0x1fff
41 #define ENC_MAX_FRM_LEN 1518
42 #define RX_RESET_COUNTER 1000
45 * For non data transfer functions, like phy read/write, set hwaddr, init
46 * we do not need a full, time consuming init including link ready wait.
47 * This enum helps to bring the chip through the minimum necessary inits.
49 enum enc_initstate {none=0, setupdone, linkready};
50 typedef struct enc_device {
51 struct eth_device *dev; /* back pointer */
52 struct spi_slave *slave;
55 u8 bank; /* current bank in enc28j60 */
56 enum enc_initstate initstate;
60 * enc_bset: set bits in a common register
61 * enc_bclr: clear bits in a common register
63 * making the reg parameter u8 will give a compile time warning if the
64 * functions are called with a register not accessible in all Banks
66 static void enc_bset(enc_dev_t *enc, const u8 reg, const u8 data)
70 dout[0] = CMD_BFS(reg);
72 spi_xfer(enc->slave, 2 * 8, dout, NULL,
73 SPI_XFER_BEGIN | SPI_XFER_END);
76 static void enc_bclr(enc_dev_t *enc, const u8 reg, const u8 data)
80 dout[0] = CMD_BFC(reg);
82 spi_xfer(enc->slave, 2 * 8, dout, NULL,
83 SPI_XFER_BEGIN | SPI_XFER_END);
87 * high byte of the register contains bank number:
88 * 0: no bank switch necessary
94 static void enc_set_bank(enc_dev_t *enc, const u16 reg)
96 u8 newbank = reg >> 8;
98 if (newbank == 0 || newbank == enc->bank)
102 enc_bclr(enc, CTL_REG_ECON1,
103 ENC_ECON1_BSEL0 | ENC_ECON1_BSEL1);
106 enc_bset(enc, CTL_REG_ECON1, ENC_ECON1_BSEL0);
107 enc_bclr(enc, CTL_REG_ECON1, ENC_ECON1_BSEL1);
110 enc_bclr(enc, CTL_REG_ECON1, ENC_ECON1_BSEL0);
111 enc_bset(enc, CTL_REG_ECON1, ENC_ECON1_BSEL1);
114 enc_bset(enc, CTL_REG_ECON1,
115 ENC_ECON1_BSEL0 | ENC_ECON1_BSEL1);
122 * local functions to access SPI
124 * reg: register inside ENC28J60
125 * data: 8/16 bits to write
126 * c: number of retries
128 * enc_r8: read 8 bits
129 * enc_r16: read 16 bits
130 * enc_w8: write 8 bits
131 * enc_w16: write 16 bits
132 * enc_w8_retry: write 8 bits, verify and retry
133 * enc_rbuf: read from ENC28J60 into buffer
134 * enc_wbuf: write from buffer into ENC28J60
138 * MAC and MII registers need a 3 byte SPI transfer to read,
139 * all other registers need a 2 byte SPI transfer.
141 static int enc_reg2nbytes(const u16 reg)
143 /* check if MAC or MII register */
144 return ((reg >= CTL_REG_MACON1 && reg <= CTL_REG_MIRDH) ||
145 (reg >= CTL_REG_MAADR1 && reg <= CTL_REG_MAADR4) ||
146 (reg == CTL_REG_MISTAT)) ? 3 : 2;
150 * Read a byte register
152 static u8 enc_r8(enc_dev_t *enc, const u16 reg)
156 int nbytes = enc_reg2nbytes(reg);
158 enc_set_bank(enc, reg);
159 dout[0] = CMD_RCR(reg);
160 spi_xfer(enc->slave, nbytes * 8, dout, din,
161 SPI_XFER_BEGIN | SPI_XFER_END);
162 return din[nbytes-1];
166 * Read a L/H register pair and return a word.
167 * Must be called with the L register's address.
169 static u16 enc_r16(enc_dev_t *enc, const u16 reg)
174 int nbytes = enc_reg2nbytes(reg);
176 enc_set_bank(enc, reg);
177 dout[0] = CMD_RCR(reg);
178 spi_xfer(enc->slave, nbytes * 8, dout, din,
179 SPI_XFER_BEGIN | SPI_XFER_END);
180 result = din[nbytes-1];
181 dout[0]++; /* next register */
182 spi_xfer(enc->slave, nbytes * 8, dout, din,
183 SPI_XFER_BEGIN | SPI_XFER_END);
184 result |= din[nbytes-1] << 8;
189 * Write a byte register
191 static void enc_w8(enc_dev_t *enc, const u16 reg, const u8 data)
195 enc_set_bank(enc, reg);
196 dout[0] = CMD_WCR(reg);
198 spi_xfer(enc->slave, 2 * 8, dout, NULL,
199 SPI_XFER_BEGIN | SPI_XFER_END);
203 * Write a L/H register pair.
204 * Must be called with the L register's address.
206 static void enc_w16(enc_dev_t *enc, const u16 reg, const u16 data)
210 enc_set_bank(enc, reg);
211 dout[0] = CMD_WCR(reg);
213 spi_xfer(enc->slave, 2 * 8, dout, NULL,
214 SPI_XFER_BEGIN | SPI_XFER_END);
215 dout[0]++; /* next register */
217 spi_xfer(enc->slave, 2 * 8, dout, NULL,
218 SPI_XFER_BEGIN | SPI_XFER_END);
222 * Write a byte register, verify and retry
224 static void enc_w8_retry(enc_dev_t *enc, const u16 reg, const u8 data, const int c)
230 enc_set_bank(enc, reg);
231 for (i = 0; i < c; i++) {
232 dout[0] = CMD_WCR(reg);
234 spi_xfer(enc->slave, 2 * 8, dout, NULL,
235 SPI_XFER_BEGIN | SPI_XFER_END);
236 readback = enc_r8(enc, reg);
237 if (readback == data)
243 printf("%s: write reg 0x%03x failed\n", enc->dev->name, reg);
248 * Read ENC RAM into buffer
250 static void enc_rbuf(enc_dev_t *enc, const u16 length, u8 *buf)
255 spi_xfer(enc->slave, 8, dout, NULL, SPI_XFER_BEGIN);
256 spi_xfer(enc->slave, length * 8, NULL, buf, SPI_XFER_END);
259 print_buffer(0, buf, 1, length, 0);
264 * Write buffer into ENC RAM
266 static void enc_wbuf(enc_dev_t *enc, const u16 length, const u8 *buf, const u8 control)
271 spi_xfer(enc->slave, 2 * 8, dout, NULL, SPI_XFER_BEGIN);
272 spi_xfer(enc->slave, length * 8, buf, NULL, SPI_XFER_END);
275 print_buffer(0, buf, 1, length, 0);
280 * Try to claim the SPI bus.
281 * Print error message on failure.
283 static int enc_claim_bus(enc_dev_t *enc)
285 int rc = spi_claim_bus(enc->slave);
287 printf("%s: failed to claim SPI bus\n", enc->dev->name);
292 * Release previously claimed SPI bus.
293 * This function is mainly for symmetry to enc_claim_bus().
294 * Let the toolchain decide to inline it...
296 static void enc_release_bus(enc_dev_t *enc)
298 spi_release_bus(enc->slave);
304 static u16 enc_phy_read(enc_dev_t *enc, const u8 addr)
309 enc_w8(enc, CTL_REG_MIREGADR, addr);
310 enc_w8(enc, CTL_REG_MICMD, ENC_MICMD_MIIRD);
311 /* 1 second timeout - only happens on hardware problem */
312 etime = get_ticks() + get_tbclk();
313 /* poll MISTAT.BUSY bit until operation is complete */
316 status = enc_r8(enc, CTL_REG_MISTAT);
317 } while (get_ticks() <= etime && (status & ENC_MISTAT_BUSY));
318 if (status & ENC_MISTAT_BUSY) {
319 printf("%s: timeout reading phy\n", enc->dev->name);
322 enc_w8(enc, CTL_REG_MICMD, 0);
323 return enc_r16(enc, CTL_REG_MIRDL);
329 static void enc_phy_write(enc_dev_t *enc, const u8 addr, const u16 data)
334 enc_w8(enc, CTL_REG_MIREGADR, addr);
335 enc_w16(enc, CTL_REG_MIWRL, data);
336 /* 1 second timeout - only happens on hardware problem */
337 etime = get_ticks() + get_tbclk();
338 /* poll MISTAT.BUSY bit until operation is complete */
341 status = enc_r8(enc, CTL_REG_MISTAT);
342 } while (get_ticks() <= etime && (status & ENC_MISTAT_BUSY));
343 if (status & ENC_MISTAT_BUSY) {
344 printf("%s: timeout writing phy\n", enc->dev->name);
350 * Verify link status, wait if necessary
352 * Note: with a 10 MBit/s only PHY there is no autonegotiation possible,
353 * half/full duplex is a pure setup matter. For the time being, this driver
354 * will setup in half duplex mode only.
356 static int enc_phy_link_wait(enc_dev_t *enc)
362 #ifdef CONFIG_ENC_SILENTLINK
363 /* check if we have a link, then just return */
364 status = enc_phy_read(enc, PHY_REG_PHSTAT1);
365 if (status & ENC_PHSTAT1_LLSTAT)
369 /* wait for link with 1 second timeout */
370 etime = get_ticks() + get_tbclk();
371 while (get_ticks() <= etime) {
372 status = enc_phy_read(enc, PHY_REG_PHSTAT1);
373 if (status & ENC_PHSTAT1_LLSTAT) {
374 /* now we have a link */
375 status = enc_phy_read(enc, PHY_REG_PHSTAT2);
376 duplex = (status & ENC_PHSTAT2_DPXSTAT) ? 1 : 0;
377 printf("%s: link up, 10Mbps %s-duplex\n",
378 enc->dev->name, duplex ? "full" : "half");
384 /* timeout occured */
385 printf("%s: link down\n", enc->dev->name);
390 * This function resets the receiver only.
392 static void enc_reset_rx(enc_dev_t *enc)
396 econ1 = enc_r8(enc, CTL_REG_ECON1);
397 if ((econ1 & ENC_ECON1_RXRST) == 0) {
398 enc_bset(enc, CTL_REG_ECON1, ENC_ECON1_RXRST);
399 enc->rx_reset_counter = RX_RESET_COUNTER;
404 * Reset receiver and reenable it.
406 static void enc_reset_rx_call(enc_dev_t *enc)
408 enc_bclr(enc, CTL_REG_ECON1, ENC_ECON1_RXRST);
409 enc_bset(enc, CTL_REG_ECON1, ENC_ECON1_RXEN);
413 * Copy a packet from the receive ring and forward it to
414 * the protocol stack.
416 static void enc_receive(enc_dev_t *enc)
418 u8 *packet = (u8 *)NetRxPackets[0];
426 enc_w16(enc, CTL_REG_ERDPTL, enc->next_pointer);
428 enc_rbuf(enc, 6, hbuf);
429 enc->next_pointer = hbuf[0] | (hbuf[1] << 8);
430 pkt_len = hbuf[2] | (hbuf[3] << 8);
431 status = hbuf[4] | (hbuf[5] << 8);
432 debug("next_pointer=$%04x pkt_len=%u status=$%04x\n",
433 enc->next_pointer, pkt_len, status);
434 if (pkt_len <= ENC_MAX_FRM_LEN)
438 if ((status & (1L << 7)) == 0) /* check Received Ok bit */
440 /* check if next pointer is resonable */
441 if (enc->next_pointer >= ENC_TX_BUF_START)
444 enc_rbuf(enc, copy_len, packet);
446 /* advance read pointer to next pointer */
447 enc_w16(enc, CTL_REG_ERDPTL, enc->next_pointer);
448 /* decrease packet counter */
449 enc_bset(enc, CTL_REG_ECON2, ENC_ECON2_PKTDEC);
451 * Only odd values should be written to ERXRDPTL,
452 * see errata B4 pt.13
454 rxbuf_rdpt = enc->next_pointer - 1;
455 if ((rxbuf_rdpt < enc_r16(enc, CTL_REG_ERXSTL)) ||
456 (rxbuf_rdpt > enc_r16(enc, CTL_REG_ERXNDL))) {
457 enc_w16(enc, CTL_REG_ERXRDPTL,
458 enc_r16(enc, CTL_REG_ERXNDL));
460 enc_w16(enc, CTL_REG_ERXRDPTL, rxbuf_rdpt);
463 pkt_cnt = enc_r8(enc, CTL_REG_EPKTCNT);
465 (void)enc_r8(enc, CTL_REG_EIR);
467 printf("%s: receive copy_len=0\n", enc->dev->name);
471 * Because NetReceive() might call enc_send(), we need to
472 * release the SPI bus, call NetReceive(), reclaim the bus
474 enc_release_bus(enc);
475 NetReceive(packet, pkt_len);
476 if (enc_claim_bus(enc))
478 (void)enc_r8(enc, CTL_REG_EIR);
480 /* Use EPKTCNT not EIR.PKTIF flag, see errata pt. 6 */
484 * Poll for completely received packets.
486 static void enc_poll(enc_dev_t *enc)
491 #ifdef CONFIG_USE_IRQ
492 /* clear global interrupt enable bit in enc28j60 */
493 enc_bclr(enc, CTL_REG_EIE, ENC_EIE_INTIE);
495 (void)enc_r8(enc, CTL_REG_ESTAT);
496 eir_reg = enc_r8(enc, CTL_REG_EIR);
497 if (eir_reg & ENC_EIR_TXIF) {
498 /* clear TXIF bit in EIR */
499 enc_bclr(enc, CTL_REG_EIR, ENC_EIR_TXIF);
501 /* We have to use pktcnt and not pktif bit, see errata pt. 6 */
502 pkt_cnt = enc_r8(enc, CTL_REG_EPKTCNT);
504 if ((eir_reg & ENC_EIR_PKTIF) == 0) {
505 debug("enc_poll: pkt cnt > 0, but pktif not set\n");
509 * clear PKTIF bit in EIR, this should not need to be done
510 * but it seems like we get problems if we do not
512 enc_bclr(enc, CTL_REG_EIR, ENC_EIR_PKTIF);
514 if (eir_reg & ENC_EIR_RXERIF) {
515 printf("%s: rx error\n", enc->dev->name);
516 enc_bclr(enc, CTL_REG_EIR, ENC_EIR_RXERIF);
518 if (eir_reg & ENC_EIR_TXERIF) {
519 printf("%s: tx error\n", enc->dev->name);
520 enc_bclr(enc, CTL_REG_EIR, ENC_EIR_TXERIF);
522 #ifdef CONFIG_USE_IRQ
523 /* set global interrupt enable bit in enc28j60 */
524 enc_bset(enc, CTL_REG_EIE, ENC_EIE_INTIE);
529 * Completely Reset the ENC
531 static void enc_reset(enc_dev_t *enc)
536 spi_xfer(enc->slave, 8, dout, NULL,
537 SPI_XFER_BEGIN | SPI_XFER_END);
538 /* sleep 1 ms. See errata pt. 2 */
543 * Initialisation data for most of the ENC registers
545 static const u16 enc_initdata[] = {
547 * Setup the buffer space. The reset values are valid for the
550 * We shall not write to ERXST, see errata pt. 5. Instead we
551 * have to make sure that ENC_RX_BUS_START is 0.
553 CTL_REG_ERXSTL, ENC_RX_BUF_START,
554 CTL_REG_ERXSTH, ENC_RX_BUF_START >> 8,
555 CTL_REG_ERXNDL, ENC_RX_BUF_END,
556 CTL_REG_ERXNDH, ENC_RX_BUF_END >> 8,
557 CTL_REG_ERDPTL, ENC_RX_BUF_START,
558 CTL_REG_ERDPTH, ENC_RX_BUF_START >> 8,
560 * Set the filter to receive only good-CRC, unicast and broadcast
562 * Note: some DHCP servers return their answers as broadcasts!
563 * So its unwise to remove broadcast from this. This driver
564 * might incur receiver overruns with packet loss on a broadcast
567 CTL_REG_ERXFCON, ENC_RFR_BCEN | ENC_RFR_UCEN | ENC_RFR_CRCEN,
569 /* enable MAC to receive frames */
571 ENC_MACON1_MARXEN | ENC_MACON1_TXPAUS | ENC_MACON1_RXPAUS,
573 /* configure pad, tx-crc and duplex */
575 ENC_MACON3_PADCFG0 | ENC_MACON3_TXCRCEN |
578 /* Allow infinite deferals if the medium is continously busy */
579 CTL_REG_MACON4, ENC_MACON4_DEFER,
581 /* Late collisions occur beyond 63 bytes */
582 CTL_REG_MACLCON2, 63,
585 * Set (low byte) Non-Back-to_Back Inter-Packet Gap.
588 CTL_REG_MAIPGL, 0x12,
591 * Set (high byte) Non-Back-to_Back Inter-Packet Gap.
592 * Recommended 0x0c for half-duplex. Nothing for full-duplex
594 CTL_REG_MAIPGH, 0x0C,
596 /* set maximum frame length */
597 CTL_REG_MAMXFLL, ENC_MAX_FRM_LEN,
598 CTL_REG_MAMXFLH, ENC_MAX_FRM_LEN >> 8,
601 * Set MAC back-to-back inter-packet gap.
602 * Recommended 0x12 for half duplex
603 * and 0x15 for full duplex.
605 CTL_REG_MABBIPG, 0x12,
612 * Wait for the XTAL oscillator to become ready
614 static int enc_clock_wait(enc_dev_t *enc)
618 /* one second timeout */
619 etime = get_ticks() + get_tbclk();
622 * Wait for CLKRDY to become set (i.e., check that we can
623 * communicate with the ENC)
627 if (enc_r8(enc, CTL_REG_ESTAT) & ENC_ESTAT_CLKRDY)
629 } while (get_ticks() <= etime);
631 printf("%s: timeout waiting for CLKRDY\n", enc->dev->name);
636 * Write the MAC address into the ENC
638 static int enc_write_macaddr(enc_dev_t *enc)
640 unsigned char *p = enc->dev->enetaddr;
642 enc_w8_retry(enc, CTL_REG_MAADR5, *p++, 5);
643 enc_w8_retry(enc, CTL_REG_MAADR4, *p++, 5);
644 enc_w8_retry(enc, CTL_REG_MAADR3, *p++, 5);
645 enc_w8_retry(enc, CTL_REG_MAADR2, *p++, 5);
646 enc_w8_retry(enc, CTL_REG_MAADR1, *p++, 5);
647 enc_w8_retry(enc, CTL_REG_MAADR0, *p, 5);
652 * Setup most of the ENC registers
654 static int enc_setup(enc_dev_t *enc)
660 /* reset enc struct values */
661 enc->next_pointer = ENC_RX_BUF_START;
662 enc->rx_reset_counter = RX_RESET_COUNTER;
663 enc->bank = 0xff; /* invalidate current bank in enc28j60 */
665 /* verify PHY identification */
666 phid1 = enc_phy_read(enc, PHY_REG_PHID1);
667 phid2 = enc_phy_read(enc, PHY_REG_PHID2) & ENC_PHID2_MASK;
668 if (phid1 != ENC_PHID1_VALUE || phid2 != ENC_PHID2_VALUE) {
669 printf("%s: failed to identify PHY. Found %04x:%04x\n",
670 enc->dev->name, phid1, phid2);
674 /* now program registers */
675 for (tp = enc_initdata; *tp != 0xffff; tp += 2)
676 enc_w8_retry(enc, tp[0], tp[1], 10);
679 * Prevent automatic loopback of data beeing transmitted by setting
682 enc_phy_write(enc, PHY_REG_PHCON2, (1<<8));
686 * LEDA: LACFG = 0100 -> display link status
687 * LEDB: LBCFG = 0111 -> display TX & RX activity
688 * STRCH = 1 -> LED pulses
690 enc_phy_write(enc, PHY_REG_PHLCON, 0x0472);
692 /* Reset PDPXMD-bit => half duplex */
693 enc_phy_write(enc, PHY_REG_PHCON1, 0);
695 #ifdef CONFIG_USE_IRQ
696 /* enable interrupts */
697 enc_bset(enc, CTL_REG_EIE, ENC_EIE_PKTIE);
698 enc_bset(enc, CTL_REG_EIE, ENC_EIE_TXIE);
699 enc_bset(enc, CTL_REG_EIE, ENC_EIE_RXERIE);
700 enc_bset(enc, CTL_REG_EIE, ENC_EIE_TXERIE);
701 enc_bset(enc, CTL_REG_EIE, ENC_EIE_INTIE);
708 * Check if ENC has been initialized.
709 * If not, try to initialize it.
710 * Remember initialized state in struct.
712 static int enc_initcheck(enc_dev_t *enc, const enum enc_initstate requiredstate)
714 if (enc->initstate >= requiredstate)
717 if (enc->initstate < setupdone) {
718 /* Initialize the ENC only */
720 /* if any of functions fails, skip the rest and return an error */
721 if (enc_clock_wait(enc) || enc_setup(enc) || enc_write_macaddr(enc)) {
724 enc->initstate = setupdone;
726 /* if that's all we need, return here */
727 if (enc->initstate >= requiredstate)
730 /* now wait for link ready condition */
731 if (enc_phy_link_wait(enc)) {
734 enc->initstate = linkready;
738 #if defined(CONFIG_CMD_MII)
740 * Read a PHY register.
742 * This function is registered with miiphy_register().
744 int enc_miiphy_read(const char *devname, u8 phy_adr, u8 reg, u16 *value)
746 struct eth_device *dev = eth_get_dev_by_name(devname);
749 if (!dev || phy_adr != 0)
753 if (enc_claim_bus(enc))
755 if (enc_initcheck(enc, setupdone)) {
756 enc_release_bus(enc);
759 *value = enc_phy_read(enc, reg);
760 enc_release_bus(enc);
765 * Write a PHY register.
767 * This function is registered with miiphy_register().
769 int enc_miiphy_write(const char *devname, u8 phy_adr, u8 reg, u16 value)
771 struct eth_device *dev = eth_get_dev_by_name(devname);
774 if (!dev || phy_adr != 0)
778 if (enc_claim_bus(enc))
780 if (enc_initcheck(enc, setupdone)) {
781 enc_release_bus(enc);
784 enc_phy_write(enc, reg, value);
785 enc_release_bus(enc);
791 * Write hardware (MAC) address.
793 * This function entered into eth_device structure.
795 static int enc_write_hwaddr(struct eth_device *dev)
797 enc_dev_t *enc = dev->priv;
799 if (enc_claim_bus(enc))
801 if (enc_initcheck(enc, setupdone)) {
802 enc_release_bus(enc);
805 enc_release_bus(enc);
810 * Initialize ENC28J60 for use.
812 * This function entered into eth_device structure.
814 static int enc_init(struct eth_device *dev, bd_t *bis)
816 enc_dev_t *enc = dev->priv;
818 if (enc_claim_bus(enc))
820 if (enc_initcheck(enc, linkready)) {
821 enc_release_bus(enc);
825 enc_bset(enc, CTL_REG_ECON1, ENC_ECON1_RXEN);
826 enc_release_bus(enc);
831 * Check for received packets.
833 * This function entered into eth_device structure.
835 static int enc_recv(struct eth_device *dev)
837 enc_dev_t *enc = dev->priv;
839 if (enc_claim_bus(enc))
841 if (enc_initcheck(enc, linkready)) {
842 enc_release_bus(enc);
845 /* Check for dead receiver */
846 if (enc->rx_reset_counter > 0)
847 enc->rx_reset_counter--;
849 enc_reset_rx_call(enc);
851 enc_release_bus(enc);
858 * This function entered into eth_device structure.
860 * Should we wait here until we have a Link? Or shall we leave that to
864 struct eth_device *dev,
868 enc_dev_t *enc = dev->priv;
870 if (enc_claim_bus(enc))
872 if (enc_initcheck(enc, linkready)) {
873 enc_release_bus(enc);
876 /* setup transmit pointers */
877 enc_w16(enc, CTL_REG_EWRPTL, ENC_TX_BUF_START);
878 enc_w16(enc, CTL_REG_ETXNDL, length + ENC_TX_BUF_START);
879 enc_w16(enc, CTL_REG_ETXSTL, ENC_TX_BUF_START);
880 /* write packet to ENC */
881 enc_wbuf(enc, length, (u8 *) packet, 0x00);
883 * Check that the internal transmit logic has not been altered
884 * by excessive collisions. Reset transmitter if so.
885 * See Errata B4 12 and 14.
887 if (enc_r8(enc, CTL_REG_EIR) & ENC_EIR_TXERIF) {
888 enc_bset(enc, CTL_REG_ECON1, ENC_ECON1_TXRST);
889 enc_bclr(enc, CTL_REG_ECON1, ENC_ECON1_TXRST);
891 enc_bclr(enc, CTL_REG_EIR, (ENC_EIR_TXERIF | ENC_EIR_TXIF));
892 /* start transmitting */
893 enc_bset(enc, CTL_REG_ECON1, ENC_ECON1_TXRTS);
894 enc_release_bus(enc);
901 * This function entered into eth_device structure.
903 static void enc_halt(struct eth_device *dev)
905 enc_dev_t *enc = dev->priv;
907 if (enc_claim_bus(enc))
909 /* Just disable receiver */
910 enc_bclr(enc, CTL_REG_ECON1, ENC_ECON1_RXEN);
911 enc_release_bus(enc);
915 * This is the only exported function.
917 * It may be called several times with different bus:cs combinations.
919 int enc28j60_initialize(unsigned int bus, unsigned int cs,
920 unsigned int max_hz, unsigned int mode)
922 struct eth_device *dev;
925 /* try to allocate, check and clear eth_device object */
926 dev = malloc(sizeof(*dev));
930 memset(dev, 0, sizeof(*dev));
932 /* try to allocate, check and clear enc_dev_t object */
933 enc = malloc(sizeof(*enc));
938 memset(enc, 0, sizeof(*enc));
940 /* try to setup the SPI slave */
941 enc->slave = spi_setup_slave(bus, cs, max_hz, mode);
943 printf("enc28j60: invalid SPI device %i:%i\n", bus, cs);
950 /* now fill the eth_device object */
952 dev->init = enc_init;
953 dev->halt = enc_halt;
954 dev->send = enc_send;
955 dev->recv = enc_recv;
956 dev->write_hwaddr = enc_write_hwaddr;
957 sprintf(dev->name, "enc%i.%i", bus, cs);
959 #if defined(CONFIG_CMD_MII)
960 miiphy_register(dev->name, enc_miiphy_read, enc_miiphy_write);