2 * Etherboot - BOOTP/TFTP Bootstrap Program
4 * w89c840.c -- This file implements the winbond-840 driver for etherboot.
9 * Adapted by Igor V. Kovalenko
10 * -- <garrison@mail.ru>
12 * -- <iko@crec.mipt.ru>
13 * Initial adaptaion stage, including testing, completed 23 August 2000.
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License as
19 * published by the Free Software Foundation; either version 2, or (at
20 * your option) any later version.
22 * This program is distributed in the hope that it will be useful, but
23 * WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
33 FILE_LICENCE ( GPL2_OR_LATER );
36 * date version by what
37 * Written: Aug 20 2000 V0.10 iko Initial revision.
38 * changes: Aug 22 2000 V0.90 iko Works!
39 * Aug 23 2000 V0.91 iko Cleanup, posted to etherboot
41 * Aug 26 2000 V0.92 iko Fixed Rx ring handling.
42 * First Linux Kernel (TM)
43 * successfully loaded using
45 * Jan 07 2001 V0.93 iko Transmitter timeouts are handled
46 * using timer2 routines. Proposed
47 * by Ken Yap to eliminate CPU speed
49 * Dec 12 2003 V0.94 timlegge Fixed issues in 5.2, removed
50 * interrupt usage, enabled
53 * This is the etherboot driver for cards based on Winbond W89c840F chip.
55 * It was written from skeleton source, with Donald Becker's winbond-840.c
56 * kernel driver as a guideline. Mostly the w89c840 related definitions
57 * and the lower level routines have been cut-and-pasted into this source.
59 * Frankly speaking, about 90% of the code was obtained using cut'n'paste
60 * sequence :) while the remainder appeared while brainstorming
61 * Linux Kernel 2.4.0-testX source code. Thanks, Donald and Linus!
63 * There was a demand for using this card in a rather large
64 * remote boot environment at MSKP OVTI Lab of
65 * Moscow Institute for Physics and Technology (MIPT) -- http://www.mipt.ru/
66 * so you may count that for motivation.
71 * If you want to see debugging output then define W89C840_DEBUG
79 * Keep using IO_OPS for Etherboot driver!
83 #include "etherboot.h"
86 #include <ipxe/ethernet.h>
88 static const char *w89c840_version = "driver Version 0.94 - December 12, 2003";
90 /* Linux support functions */
91 #define virt_to_le32desc(addr) virt_to_bus(addr)
92 #define le32desc_to_virt(addr) bus_to_virt(addr)
95 #define cpu_to_le32(val) (val)
96 #define le32_to_cpu(val) (val)
99 /* Operational parameters that are set at compile time. */
101 /* Keep the ring sizes a power of two for compile efficiency.
102 The compiler will convert <unsigned>'%'<2^N> into a bit mask.
103 Making the Tx ring too large decreases the effectiveness of channel
104 bonding and packet priority.
105 There are no ill effects from too-large receive rings. */
106 #define TX_RING_SIZE 2
107 #define RX_RING_SIZE 2
109 /* The presumed FIFO size for working around the Tx-FIFO-overflow bug.
110 To avoid overflowing we don't queue again until we have room for a
113 #define TX_FIFO_SIZE (2048)
114 #define TX_BUG_FIFO_LIMIT (TX_FIFO_SIZE-1514-16)
116 /* Operational parameters that usually are not changed. */
117 /* Time in jiffies before concluding the transmitter is hung. */
118 #define TX_TIMEOUT (10*1000)
120 #define PKT_BUF_SZ 1536 /* Size of each temporary Rx buffer.*/
123 * Used to be this much CPU loops on Celeron@400 (?),
124 * now using real timer and TX_TIMEOUT!
125 * #define TX_LOOP_COUNT 10000000
128 #if !defined(__OPTIMIZE__)
129 #warning You must compile this file with the correct options!
130 #warning See the last lines of the source file.
131 #error You must compile this driver with "-O".
134 enum chip_capability_flags {CanHaveMII=1, HasBrokenTx=2};
137 #define W840_FLAGS (PCI_USES_IO | PCI_ADDR0 | PCI_USES_MASTER)
139 #define W840_FLAGS (PCI_USES_MEM | PCI_ADDR1 | PCI_USES_MASTER)
142 static u32 driver_flags = CanHaveMII | HasBrokenTx;
144 /* This driver was written to use PCI memory space, however some x86 systems
145 work only with I/O space accesses. Pass -DUSE_IO_OPS to use PCI I/O space
146 accesses instead of memory space. */
163 /* Offsets to the Command and Status Registers, "CSRs".
164 While similar to the Tulip, these registers are longword aligned.
165 Note: It's not useful to define symbolic names for every register bit in
166 the device. The name can only partially document the semantics and make
167 the driver longer and more difficult to read.
170 PCIBusCfg=0x00, TxStartDemand=0x04, RxStartDemand=0x08,
171 RxRingPtr=0x0C, TxRingPtr=0x10,
172 IntrStatus=0x14, NetworkConfig=0x18, IntrEnable=0x1C,
173 RxMissed=0x20, EECtrl=0x24, MIICtrl=0x24, BootRom=0x28, GPTimer=0x2C,
174 CurRxDescAddr=0x30, CurRxBufAddr=0x34, /* Debug use */
175 MulticastFilter0=0x38, MulticastFilter1=0x3C, StationAddr=0x40,
176 CurTxDescAddr=0x4C, CurTxBufAddr=0x50,
179 /* Bits in the interrupt status/enable registers. */
180 /* The bits in the Intr Status/Enable registers, mostly interrupt sources. */
181 enum intr_status_bits {
182 NormalIntr=0x10000, AbnormalIntr=0x8000,
183 IntrPCIErr=0x2000, TimerInt=0x800,
184 IntrRxDied=0x100, RxNoBuf=0x80, IntrRxDone=0x40,
185 TxFIFOUnderflow=0x20, RxErrIntr=0x10,
186 TxIdle=0x04, IntrTxStopped=0x02, IntrTxDone=0x01,
189 /* Bits in the NetworkConfig register. */
191 AcceptErr=0x80, AcceptRunt=0x40,
192 AcceptBroadcast=0x20, AcceptMulticast=0x10,
193 AcceptAllPhys=0x08, AcceptMyPhys=0x02,
197 MDIO_ShiftClk=0x10000, MDIO_DataIn=0x80000, MDIO_DataOut=0x20000,
198 MDIO_EnbOutput=0x40000, MDIO_EnbIn = 0x00000,
201 /* The Tulip Rx and Tx buffer descriptors. */
202 struct w840_rx_desc {
209 struct w840_tx_desc {
212 u32 buffer1, buffer2; /* We use only buffer 1. */
215 /* Bits in network_desc.status */
216 enum desc_status_bits {
217 DescOwn=0x80000000, DescEndRing=0x02000000, DescUseLink=0x01000000,
218 DescWholePkt=0x60000000, DescStartPkt=0x20000000, DescEndPkt=0x40000000,
221 #define PRIV_ALIGN 15 /* Required alignment mask */
222 #define PRIV_ALIGN_BYTES 32
224 static struct winbond_private
226 /* Descriptor rings first for alignment. */
227 struct w840_rx_desc rx_ring[RX_RING_SIZE];
228 struct w840_tx_desc tx_ring[TX_RING_SIZE];
229 struct net_device *next_module; /* Link for devices of this type. */
230 void *priv_addr; /* Unaligned address for kfree */
231 const char *product_name;
232 /* Frequently used values: keep some adjacent for cache effect. */
233 int chip_id, drv_flags;
234 struct pci_dev *pci_dev;
236 struct w840_rx_desc *rx_head_desc;
237 unsigned int cur_rx, dirty_rx; /* Producer/consumer ring indices */
238 unsigned int rx_buf_sz; /* Based on MTU+slack. */
239 unsigned int cur_tx, dirty_tx;
241 unsigned int tx_full:1; /* The Tx queue is full. */
242 /* These values are keep track of the transceiver/media in use. */
243 unsigned int full_duplex:1; /* Full-duplex operation requested. */
244 unsigned int duplex_lock:1;
245 unsigned int medialock:1; /* Do not sense media. */
246 unsigned int default_port:4; /* Last dev->if_port value. */
247 /* MII transceiver section. */
248 int mii_cnt; /* MII device addresses. */
249 u16 advertising; /* NWay media advertisement */
250 unsigned char phys[2]; /* MII device addresses. */
251 } w840private __attribute__ ((aligned (PRIV_ALIGN_BYTES)));
253 /* NIC specific static variables go here */
256 static unsigned short eeprom [0x40];
258 char rx_packet[PKT_BUF_SZ * RX_RING_SIZE];
259 char tx_packet[PKT_BUF_SZ * TX_RING_SIZE];
260 } w89c840_buf __shared;
262 static int eeprom_read(long ioaddr, int location);
263 static int mdio_read(int base_address, int phy_id, int location);
265 static void mdio_write(int base_address, int phy_id, int location, int value);
268 static void check_duplex(void);
269 static void set_rx_mode(void);
270 static void init_ring(void);
272 #if defined(W89C840_DEBUG)
273 static void decode_interrupt(u32 intr_status)
275 printf("Interrupt status: ");
277 #define TRACE_INTR(_intr_) \
278 if (intr_status & (_intr_)) { printf (" " #_intr_); }
280 TRACE_INTR(NormalIntr);
281 TRACE_INTR(AbnormalIntr);
282 TRACE_INTR(IntrPCIErr);
283 TRACE_INTR(TimerInt);
284 TRACE_INTR(IntrRxDied);
286 TRACE_INTR(IntrRxDone);
287 TRACE_INTR(TxFIFOUnderflow);
288 TRACE_INTR(RxErrIntr);
290 TRACE_INTR(IntrTxStopped);
291 TRACE_INTR(IntrTxDone);
298 /**************************************************************************
299 w89c840_reset - Reset adapter
300 ***************************************************************************/
301 static void w89c840_reset(struct nic *nic)
305 /* Reset the chip to erase previous misconfiguration.
306 No hold time required! */
307 writel(0x00000001, ioaddr + PCIBusCfg);
311 writel(virt_to_bus(w840private.rx_ring), ioaddr + RxRingPtr);
312 writel(virt_to_bus(w840private.tx_ring), ioaddr + TxRingPtr);
314 for (i = 0; i < ETH_ALEN; i++)
315 writeb(nic->node_addr[i], ioaddr + StationAddr + i);
317 /* Initialize other registers. */
318 /* Configure the PCI bus bursts and FIFO thresholds.
319 486: Set 8 longword cache alignment, 8 longword burst.
320 586: Set 16 longword cache alignment, no burst limit.
321 Cache alignment bits 15:14 Burst length 13:8
322 0000 <not allowed> 0000 align to cache 0800 8 longwords
323 4000 8 longwords 0100 1 longword 1000 16 longwords
324 8000 16 longwords 0200 2 longwords 2000 32 longwords
325 C000 32 longwords 0400 4 longwords
326 Wait the specified 50 PCI cycles after a reset by initializing
327 Tx and Rx queues and the address filter list. */
329 writel(0xE010, ioaddr + PCIBusCfg);
331 writel(0, ioaddr + RxStartDemand);
332 w840private.csr6 = 0x20022002;
336 /* Do not enable the interrupts Etherboot doesn't need them */
338 writel(0x1A0F5, ioaddr + IntrStatus);
339 writel(0x1A0F5, ioaddr + IntrEnable);
341 #if defined(W89C840_DEBUG)
342 printf("winbond-840 : Done reset.\n");
347 static void handle_intr(u32 intr_stat)
349 if ((intr_stat & (NormalIntr|AbnormalIntr)) == 0) {
350 /* we are polling, do not return now */
353 /* Acknowledge all of the current interrupt sources ASAP. */
354 writel(intr_stat & 0x001ffff, ioaddr + IntrStatus);
357 if (intr_stat & AbnormalIntr) {
358 /* There was an abnormal interrupt */
359 printf("\n-=- Abnormal interrupt.\n");
361 #if defined(W89C840_DEBUG)
362 decode_interrupt(intr_stat);
365 if (intr_stat & RxNoBuf) {
366 /* There was an interrupt */
367 printf("-=- <=> No receive buffers available.\n");
368 writel(0, ioaddr + RxStartDemand);
374 /**************************************************************************
375 w89c840_poll - Wait for a frame
376 ***************************************************************************/
377 static int w89c840_poll(struct nic *nic, int retrieve)
379 /* return true if there's an ethernet packet ready to read */
380 /* nic->packet should contain data on return */
381 /* nic->packetlen should contain length of data */
382 int packet_received = 0;
384 #if defined(W89C840_DEBUG)
385 u32 intr_status = readl(ioaddr + IntrStatus);
389 /* Code from netdev_rx(dev) */
391 int entry = w840private.cur_rx % RX_RING_SIZE;
393 struct w840_rx_desc *desc = w840private.rx_head_desc;
394 s32 status = desc->status;
396 if (status & DescOwn) {
397 /* DescOwn bit is still set, we should wait for RX to complete */
407 if ((status & 0x38008300) != 0x0300) {
408 if ((status & 0x38000300) != 0x0300) {
409 /* Ingore earlier buffers. */
410 if ((status & 0xffff) != 0x7fff) {
411 printf("winbond-840 : Oversized Ethernet frame spanned "
412 "multiple buffers, entry %d status %X !\n",
413 w840private.cur_rx, (unsigned int) status);
415 } else if (status & 0x8000) {
416 /* There was a fatal error. */
417 #if defined(W89C840_DEBUG)
418 printf("winbond-840 : Receive error, Rx status %X :", status);
419 if (status & 0x0890) {
420 printf(" RXLEN_ERROR");
422 if (status & 0x004C) {
423 printf(", FRAME_ERROR");
425 if (status & 0x0002) {
426 printf(", CRC_ERROR");
431 /* Simpy do a reset now... */
438 /* Omit the four octet CRC from the length. */
439 int pkt_len = ((status >> 16) & 0x7ff) - 4;
441 #if defined(W89C840_DEBUG)
442 printf(" netdev_rx() normal Rx pkt ring %d length %d status %X\n", entry, pkt_len, status);
445 nic->packetlen = pkt_len;
447 /* Check if the packet is long enough to accept without copying
448 to a minimally-sized skbuff. */
450 memcpy(nic->packet, le32desc_to_virt(w840private.rx_ring[entry].buffer1), pkt_len);
453 /* Release buffer to NIC */
454 w840private.rx_ring[entry].status = DescOwn;
456 #if defined(W89C840_DEBUG)
457 /* You will want this info for the initial debug. */
458 printf(" Rx data %hhX:%hhX:%hhX:%hhX:%hhX:"
459 "%hhX %hhX:%hhX:%hhX:%hhX:%hhX:%hhX %hhX%hhX "
460 "%hhX.%hhX.%hhX.%hhX.\n",
461 nic->packet[0], nic->packet[1], nic->packet[2], nic->packet[3],
462 nic->packet[4], nic->packet[5], nic->packet[6], nic->packet[7],
463 nic->packet[8], nic->packet[9], nic->packet[10],
464 nic->packet[11], nic->packet[12], nic->packet[13],
465 nic->packet[14], nic->packet[15], nic->packet[16],
471 entry = (++w840private.cur_rx) % RX_RING_SIZE;
472 w840private.rx_head_desc = &w840private.rx_ring[entry];
475 return packet_received;
478 /**************************************************************************
479 w89c840_transmit - Transmit a frame
480 ***************************************************************************/
482 static void w89c840_transmit(
484 const char *d, /* Destination */
485 unsigned int t, /* Type */
486 unsigned int s, /* size */
487 const char *p) /* Packet */
489 /* send the packet to destination */
494 /* Caution: the write order is important here, set the field
495 with the "ownership" bits last. */
497 /* Fill in our transmit buffer */
498 entry = w840private.cur_tx % TX_RING_SIZE;
500 memcpy (w89c840_buf.tx_packet, d, ETH_ALEN); /* dst */
501 memcpy (w89c840_buf.tx_packet + ETH_ALEN, nic->node_addr, ETH_ALEN);/*src*/
503 *((char *) w89c840_buf.tx_packet + 12) = t >> 8; /* type */
504 *((char *) w89c840_buf.tx_packet + 13) = t;
506 memcpy (w89c840_buf.tx_packet + ETH_HLEN, p, s);
510 *((char *) w89c840_buf.tx_packet + ETH_HLEN + (s++)) = 0;
512 w840private.tx_ring[entry].buffer1
513 = virt_to_le32desc(w89c840_buf.tx_packet);
515 w840private.tx_ring[entry].length = (DescWholePkt | (u32) s);
516 if (entry >= TX_RING_SIZE-1) /* Wrap ring */
517 w840private.tx_ring[entry].length |= (DescIntr | DescEndRing);
518 w840private.tx_ring[entry].status = (DescOwn);
519 w840private.cur_tx++;
521 w840private.tx_q_bytes = (u16) s;
522 writel(0, ioaddr + TxStartDemand);
524 /* Work around horrible bug in the chip by marking the queue as full
525 when we do not have FIFO room for a maximum sized packet. */
527 if ((w840private.drv_flags & HasBrokenTx) && w840private.tx_q_bytes > TX_BUG_FIFO_LIMIT) {
528 /* Actually this is left to help finding error tails later in debugging...
529 * See Linux kernel driver in winbond-840.c for details.
531 w840private.tx_full = 1;
534 #if defined(W89C840_DEBUG)
535 printf("winbond-840 : Transmit frame # %d size %d queued in slot %d.\n", w840private.cur_tx, s, entry);
538 /* Now wait for TX to complete. */
539 transmit_status = w840private.tx_ring[entry].status;
543 #if defined W89C840_DEBUG
548 #if defined(W89C840_DEBUG)
549 decode_interrupt(intr_stat);
552 while ( (transmit_status & DescOwn) && ct + TX_TIMEOUT < currticks()) {
554 transmit_status = w840private.tx_ring[entry].status;
561 if ((transmit_status & DescOwn) == 0) {
563 #if defined(W89C840_DEBUG)
564 printf("winbond-840 : transmission complete after wait loop iterations, status %X\n",
565 w840private.tx_ring[entry].status);
571 /* Transmit timed out... */
573 printf("winbond-840 : transmission TIMEOUT : status %X\n",
574 (unsigned int) w840private.tx_ring[entry].status);
579 /**************************************************************************
580 w89c840_disable - Turn off ethernet interface
581 ***************************************************************************/
582 static void w89c840_disable ( struct nic *nic ) {
586 /* Don't know what to do to disable the board. Is this needed at all? */
587 /* Yes, a live NIC can corrupt the loaded memory later [Ken] */
588 /* Stop the chip's Tx and Rx processes. */
589 writel(w840private.csr6 &= ~0x20FA, ioaddr + NetworkConfig);
592 /**************************************************************************
593 w89c840_irq - Enable, Disable, or Force interrupts
594 ***************************************************************************/
595 static void w89c840_irq(struct nic *nic __unused, irq_action_t action __unused)
607 static struct nic_operations w89c840_operations = {
608 .connect = dummy_connect,
609 .poll = w89c840_poll,
610 .transmit = w89c840_transmit,
615 static struct pci_device_id w89c840_nics[] = {
616 PCI_ROM(0x1050, 0x0840, "winbond840", "Winbond W89C840F", 0),
617 PCI_ROM(0x11f6, 0x2011, "compexrl100atx", "Compex RL100ATX", 0),
620 PCI_DRIVER ( w89c840_driver, w89c840_nics, PCI_NO_CLASS );
622 /**************************************************************************
623 w89c840_probe - Look for an adapter, this routine's visible to the outside
624 ***************************************************************************/
625 static int w89c840_probe ( struct nic *nic, struct pci_device *p ) {
630 unsigned short value;
635 nic->ioaddr = p->ioaddr;
638 #if defined(W89C840_DEBUG)
639 printf("winbond-840: PCI bus %hhX device function %hhX: I/O address: %hX\n", p->bus, p->devfn, ioaddr);
642 ioaddr = ioaddr & ~3; /* Mask the bit that says "this is an io addr" */
644 #define PCI_DEVICE_ID_WINBOND2_89C840 0x0840
645 #define PCI_DEVICE_ID_COMPEX_RL100ATX 0x2011
647 /* From Matt Hortman <mbhortman@acpthinclient.com> */
648 if (p->vendor == PCI_VENDOR_ID_WINBOND2
649 && p->device == PCI_DEVICE_ID_WINBOND2_89C840) {
651 /* detected "Winbond W89c840 Fast Ethernet PCI NIC" */
653 } else if ( p->vendor == PCI_VENDOR_ID_COMPEX
654 && p->device == PCI_DEVICE_ID_COMPEX_RL100ATX) {
656 /* detected "Compex RL100ATX Fast Ethernet PCI NIC" */
659 /* Gee, guess what? They missed again. */
660 printf("device ID : %X - is not a Compex RL100ATX NIC.\n",
665 printf(" %s\n", w89c840_version);
667 adjust_pci_device(p);
669 /* Ok. Got one. Read the eeprom. */
670 for (i = 0; i < 0x40; i++) {
671 value = eeprom_read(ioaddr, i);
676 for (i=0;i<ETH_ALEN;i++) {
677 nic->node_addr[i] = (eeprom[i/2] >> (8*(i&1))) & 0xff;
680 DBG ( "Ethernet addr: %s\n", eth_ntoa ( nic->node_addr ) );
682 #if defined(W89C840_DEBUG)
683 printf("winbond-840: EEPROM checksum %hX, got eeprom", sum);
686 /* Reset the chip to erase previous misconfiguration.
687 No hold time required! */
688 writel(0x00000001, ioaddr + PCIBusCfg);
690 if (driver_flags & CanHaveMII) {
691 int phy, phy_idx = 0;
692 for (phy = 1; phy < 32 && phy_idx < 4; phy++) {
693 int mii_status = mdio_read(ioaddr, phy, 1);
694 if (mii_status != 0xffff && mii_status != 0x0000) {
695 w840private.phys[phy_idx++] = phy;
696 w840private.advertising = mdio_read(ioaddr, phy, 4);
698 #if defined(W89C840_DEBUG)
699 printf("winbond-840 : MII PHY found at address %d, status "
700 "%X advertising %hX.\n", phy, mii_status, w840private.advertising);
706 w840private.mii_cnt = phy_idx;
709 printf("winbond-840 : MII PHY not found -- this device may not operate correctly.\n");
713 /* point to NIC specific routines */
714 nic->nic_op = &w89c840_operations;
721 /* Read the EEPROM and MII Management Data I/O (MDIO) interfaces. These are
722 often serial bit streams generated by the host processor.
723 The example below is for the common 93c46 EEPROM, 64 16 bit words. */
725 /* Delay between EEPROM clock transitions.
726 No extra delay is needed with 33Mhz PCI, but future 66Mhz access may need
727 a delay. Note that pre-2.0.34 kernels had a cache-alignment bug that
728 made udelay() unreliable.
729 The old method of using an ISA access as a delay, __SLOW_DOWN_IO__, is
732 #define eeprom_delay(ee_addr) readl(ee_addr)
734 enum EEPROM_Ctrl_Bits {
735 EE_ShiftClk=0x02, EE_Write0=0x801, EE_Write1=0x805,
736 EE_ChipSelect=0x801, EE_DataIn=0x08,
739 /* The EEPROM commands include the alway-set leading bit. */
741 EE_WriteCmd=(5 << 6), EE_ReadCmd=(6 << 6), EE_EraseCmd=(7 << 6),
744 static int eeprom_read(long addr, int location)
748 int ee_addr = addr + EECtrl;
749 int read_cmd = location | EE_ReadCmd;
750 writel(EE_ChipSelect, ee_addr);
752 /* Shift the read command bits out. */
753 for (i = 10; i >= 0; i--) {
754 short dataval = (read_cmd & (1 << i)) ? EE_Write1 : EE_Write0;
755 writel(dataval, ee_addr);
756 eeprom_delay(ee_addr);
757 writel(dataval | EE_ShiftClk, ee_addr);
758 eeprom_delay(ee_addr);
760 writel(EE_ChipSelect, ee_addr);
762 for (i = 16; i > 0; i--) {
763 writel(EE_ChipSelect | EE_ShiftClk, ee_addr);
764 eeprom_delay(ee_addr);
765 retval = (retval << 1) | ((readl(ee_addr) & EE_DataIn) ? 1 : 0);
766 writel(EE_ChipSelect, ee_addr);
767 eeprom_delay(ee_addr);
770 /* Terminate the EEPROM access. */
775 /* MII transceiver control section.
776 Read and write the MII registers using software-generated serial
777 MDIO protocol. See the MII specifications or DP83840A data sheet
780 The maximum data clock rate is 2.5 Mhz. The minimum timing is usually
781 met by back-to-back 33Mhz PCI cycles. */
782 #define mdio_delay(mdio_addr) readl(mdio_addr)
784 /* Set iff a MII transceiver on any interface requires mdio preamble.
785 This only set with older tranceivers, so the extra
786 code size of a per-interface flag is not worthwhile. */
787 static char mii_preamble_required = 1;
789 #define MDIO_WRITE0 (MDIO_EnbOutput)
790 #define MDIO_WRITE1 (MDIO_DataOut | MDIO_EnbOutput)
792 /* Generate the preamble required for initial synchronization and
793 a few older transceivers. */
794 static void mdio_sync(long mdio_addr)
798 /* Establish sync by sending at least 32 logic ones. */
799 while (--bits >= 0) {
800 writel(MDIO_WRITE1, mdio_addr);
801 mdio_delay(mdio_addr);
802 writel(MDIO_WRITE1 | MDIO_ShiftClk, mdio_addr);
803 mdio_delay(mdio_addr);
807 static int mdio_read(int base_address, int phy_id, int location)
809 long mdio_addr = base_address + MIICtrl;
810 int mii_cmd = (0xf6 << 10) | (phy_id << 5) | location;
813 if (mii_preamble_required)
814 mdio_sync(mdio_addr);
816 /* Shift the read command bits out. */
817 for (i = 15; i >= 0; i--) {
818 int dataval = (mii_cmd & (1 << i)) ? MDIO_WRITE1 : MDIO_WRITE0;
820 writel(dataval, mdio_addr);
821 mdio_delay(mdio_addr);
822 writel(dataval | MDIO_ShiftClk, mdio_addr);
823 mdio_delay(mdio_addr);
825 /* Read the two transition, 16 data, and wire-idle bits. */
826 for (i = 20; i > 0; i--) {
827 writel(MDIO_EnbIn, mdio_addr);
828 mdio_delay(mdio_addr);
829 retval = (retval << 1) | ((readl(mdio_addr) & MDIO_DataIn) ? 1 : 0);
830 writel(MDIO_EnbIn | MDIO_ShiftClk, mdio_addr);
831 mdio_delay(mdio_addr);
833 return (retval>>1) & 0xffff;
837 static void mdio_write(int base_address, int phy_id, int location, int value)
839 long mdio_addr = base_address + MIICtrl;
840 int mii_cmd = (0x5002 << 16) | (phy_id << 23) | (location<<18) | value;
843 if (location == 4 && phy_id == w840private.phys[0])
844 w840private.advertising = value;
846 if (mii_preamble_required)
847 mdio_sync(mdio_addr);
849 /* Shift the command bits out. */
850 for (i = 31; i >= 0; i--) {
851 int dataval = (mii_cmd & (1 << i)) ? MDIO_WRITE1 : MDIO_WRITE0;
853 writel(dataval, mdio_addr);
854 mdio_delay(mdio_addr);
855 writel(dataval | MDIO_ShiftClk, mdio_addr);
856 mdio_delay(mdio_addr);
858 /* Clear out extra bits. */
859 for (i = 2; i > 0; i--) {
860 writel(MDIO_EnbIn, mdio_addr);
861 mdio_delay(mdio_addr);
862 writel(MDIO_EnbIn | MDIO_ShiftClk, mdio_addr);
863 mdio_delay(mdio_addr);
869 static void check_duplex(void)
871 int mii_reg5 = mdio_read(ioaddr, w840private.phys[0], 5);
872 int negotiated = mii_reg5 & w840private.advertising;
875 if (w840private.duplex_lock || mii_reg5 == 0xffff)
878 duplex = (negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040;
879 if (w840private.full_duplex != duplex) {
880 w840private.full_duplex = duplex;
882 #if defined(W89C840_DEBUG)
883 printf("winbond-840 : Setting %s-duplex based on MII # %d negotiated capability %X\n",
884 duplex ? "full" : "half", w840private.phys[0], negotiated);
887 w840private.csr6 &= ~0x200;
888 w840private.csr6 |= duplex ? 0x200 : 0;
892 static void set_rx_mode(void)
894 u32 mc_filter[2]; /* Multicast hash filter */
897 /* Accept all multicasts from now on. */
898 memset(mc_filter, 0xff, sizeof(mc_filter));
901 * works OK with multicast enabled.
904 rx_mode = AcceptBroadcast | AcceptMyPhys | AcceptMulticast;
906 writel(mc_filter[0], ioaddr + MulticastFilter0);
907 writel(mc_filter[1], ioaddr + MulticastFilter1);
908 w840private.csr6 &= ~0x00F8;
909 w840private.csr6 |= rx_mode;
910 writel(w840private.csr6, ioaddr + NetworkConfig);
912 #if defined(W89C840_DEBUG)
913 printf("winbond-840 : Done setting RX mode.\n");
917 /* Initialize the Rx and Tx rings, along with various 'dev' bits. */
918 static void init_ring(void)
923 w840private.tx_full = 0;
924 w840private.tx_q_bytes = w840private.cur_rx = w840private.cur_tx = 0;
925 w840private.dirty_rx = w840private.dirty_tx = 0;
927 w840private.rx_buf_sz = PKT_BUF_SZ;
928 w840private.rx_head_desc = &w840private.rx_ring[0];
930 /* Initial all Rx descriptors. Fill in the Rx buffers. */
932 p = &w89c840_buf.rx_packet[0];
934 for (i = 0; i < RX_RING_SIZE; i++) {
935 w840private.rx_ring[i].length = w840private.rx_buf_sz;
936 w840private.rx_ring[i].status = 0;
937 w840private.rx_ring[i].next_desc = virt_to_le32desc(&w840private.rx_ring[i+1]);
939 w840private.rx_ring[i].buffer1 = virt_to_le32desc(p + (PKT_BUF_SZ * i));
940 w840private.rx_ring[i].status = DescOwn | DescIntr;
943 /* Mark the last entry as wrapping the ring. */
944 w840private.rx_ring[i-1].length |= DescEndRing;
945 w840private.rx_ring[i-1].next_desc = virt_to_le32desc(&w840private.rx_ring[0]);
947 w840private.dirty_rx = (unsigned int)(i - RX_RING_SIZE);
949 for (i = 0; i < TX_RING_SIZE; i++) {
950 w840private.tx_ring[i].status = 0;
956 DRIVER ( "W89C840F", nic_driver, pci_driver, w89c840_driver,
957 w89c840_probe, w89c840_disable );