2 * rtl8139.c : U-Boot driver for the RealTek RTL8139
4 * Masami Komiya (mkomiya@sonare.it)
6 * Most part is taken from rtl8139.c of etherboot
10 /* rtl8139.c - etherboot driver for the Realtek 8139 chipset
12 ported from the linux driver written by Donald Becker
13 by Rainer Bawidamann (Rainer.Bawidamann@informatik.uni-ulm.de) 1999
15 This software may be used and distributed according to the terms
16 of the GNU Public License, incorporated herein by reference.
18 changes to the original driver:
19 - removed support for interrupts, switching to polling mode (yuck!)
20 - removed support for the 8129 chip (external MII)
24 /*********************************************************************/
25 /* Revision History */
26 /*********************************************************************/
29 28 Dec 2002 ken_yap@users.sourceforge.net (Ken Yap)
30 Put in virt_to_bus calls to allow Etherboot relocation.
32 06 Apr 2001 ken_yap@users.sourceforge.net (Ken Yap)
33 Following email from Hyun-Joon Cha, added a disable routine, otherwise
34 NIC remains live and can crash the kernel later.
36 4 Feb 2000 espenlaub@informatik.uni-ulm.de (Klaus Espenlaub)
37 Shuffled things around, removed the leftovers from the 8129 support
38 that was in the Linux driver and added a bit more 8139 definitions.
39 Moved the 8K receive buffer to a fixed, available address outside the
40 0x98000-0x9ffff range. This is a bit of a hack, but currently the only
41 way to make room for the Etherboot features that need substantial amounts
42 of code like the ANSI console support. Currently the buffer is just below
43 0x10000, so this even conforms to the tagged boot image specification,
44 which reserves the ranges 0x00000-0x10000 and 0x98000-0xA0000. My
45 interpretation of this "reserved" is that Etherboot may do whatever it
46 likes, as long as its environment is kept intact (like the BIOS
47 variables). Hopefully fixed rtl_poll() once and for all. The symptoms
48 were that if Etherboot was left at the boot menu for several minutes, the
49 first eth_poll failed. Seems like I am the only person who does this.
50 First of all I fixed the debugging code and then set out for a long bug
51 hunting session. It took me about a week full time work - poking around
52 various places in the driver, reading Don Becker's and Jeff Garzik's Linux
53 driver and even the FreeBSD driver (what a piece of crap!) - and
54 eventually spotted the nasty thing: the transmit routine was acknowledging
55 each and every interrupt pending, including the RxOverrun and RxFIFIOver
56 interrupts. This confused the RTL8139 thoroughly. It destroyed the
57 Rx ring contents by dumping the 2K FIFO contents right where we wanted to
58 get the next packet. Oh well, what fun.
60 18 Jan 2000 mdc@thinguin.org (Marty Connor)
61 Drastically simplified error handling. Basically, if any error
62 in transmission or reception occurs, the card is reset.
63 Also, pointed all transmit descriptors to the same buffer to
64 save buffer space. This should decrease driver size and avoid
65 corruption because of exceeding 32K during runtime.
67 28 Jul 1999 (Matthias Meixner - meixner@rbg.informatik.tu-darmstadt.de)
68 rtl_poll was quite broken: it used the RxOK interrupt flag instead
69 of the RxBufferEmpty flag which often resulted in very bad
70 transmission performace - below 1kBytes/s.
80 #if (CONFIG_COMMANDS & CFG_CMD_NET) && defined(CONFIG_NET_MULTI) && \
81 defined(CONFIG_RTL8139)
83 #define TICKS_PER_SEC CFG_HZ
84 #define TICKS_PER_MS (TICKS_PER_SEC/1000)
86 #define RTL_TIMEOUT (1*TICKS_PER_SEC)
88 #define ETH_FRAME_LEN 1514
92 /* PCI Tuning Parameters
93 Threshold is bytes transferred to chip before transmission starts. */
94 #define TX_FIFO_THRESH 256 /* In bytes, rounded down to 32 byte units. */
95 #define RX_FIFO_THRESH 4 /* Rx buffer level before first PCI xfer. */
96 #define RX_DMA_BURST 4 /* Maximum PCI burst, '4' is 256 bytes */
97 #define TX_DMA_BURST 4 /* Calculate as 16<<val. */
98 #define NUM_TX_DESC 4 /* Number of Tx descriptor registers. */
99 #define TX_BUF_SIZE ETH_FRAME_LEN /* FCS is added by the chip */
100 #define RX_BUF_LEN_IDX 0 /* 0, 1, 2 is allowed - 8,16,32K rx buffer */
101 #define RX_BUF_LEN (8192 << RX_BUF_LEN_IDX)
106 #define currticks() get_timer(0)
107 #define bus_to_phys(a) pci_mem_to_phys((pci_dev_t)dev->priv, a)
108 #define phys_to_bus(a) pci_phys_to_mem((pci_dev_t)dev->priv, a)
110 /* Symbolic offsets to registers. */
111 enum RTL8139_registers {
112 MAC0=0, /* Ethernet hardware address. */
113 MAR0=8, /* Multicast filter. */
114 TxStatus0=0x10, /* Transmit status (four 32bit registers). */
115 TxAddr0=0x20, /* Tx descriptors (also four 32bit). */
116 RxBuf=0x30, RxEarlyCnt=0x34, RxEarlyStatus=0x36,
117 ChipCmd=0x37, RxBufPtr=0x38, RxBufAddr=0x3A,
118 IntrMask=0x3C, IntrStatus=0x3E,
119 TxConfig=0x40, RxConfig=0x44,
120 Timer=0x48, /* general-purpose counter. */
121 RxMissed=0x4C, /* 24 bits valid, write clears. */
122 Cfg9346=0x50, Config0=0x51, Config1=0x52,
123 TimerIntrReg=0x54, /* intr if gp counter reaches this value */
127 RevisionID=0x5E, /* revision of the RTL8139 chip */
129 MII_BMCR=0x62, MII_BMSR=0x64, NWayAdvert=0x66, NWayLPAR=0x68,
131 DisconnectCnt=0x6C, FalseCarrierCnt=0x6E,
133 RxCnt=0x72, /* packet received counter */
134 CSCR=0x74, /* chip status and configuration register */
135 PhyParm1=0x78,TwisterParm=0x7c,PhyParm2=0x80, /* undocumented */
136 /* from 0x84 onwards are a number of power management/wakeup frame
137 * definitions we will probably never need to know about. */
141 CmdReset=0x10, CmdRxEnb=0x08, CmdTxEnb=0x04, RxBufEmpty=0x01, };
143 /* Interrupt register bits, using my own meaningful names. */
144 enum IntrStatusBits {
145 PCIErr=0x8000, PCSTimeout=0x4000, CableLenChange= 0x2000,
146 RxFIFOOver=0x40, RxUnderrun=0x20, RxOverflow=0x10,
147 TxErr=0x08, TxOK=0x04, RxErr=0x02, RxOK=0x01,
150 TxHostOwns=0x2000, TxUnderrun=0x4000, TxStatOK=0x8000,
151 TxOutOfWindow=0x20000000, TxAborted=0x40000000,
152 TxCarrierLost=0x80000000,
155 RxMulticast=0x8000, RxPhysical=0x4000, RxBroadcast=0x2000,
156 RxBadSymbol=0x0020, RxRunt=0x0010, RxTooLong=0x0008, RxCRCErr=0x0004,
157 RxBadAlign=0x0002, RxStatusOK=0x0001,
160 enum MediaStatusBits {
161 MSRTxFlowEnable=0x80, MSRRxFlowEnable=0x40, MSRSpeed10=0x08,
162 MSRLinkFail=0x04, MSRRxPauseFlag=0x02, MSRTxPauseFlag=0x01,
166 BMCRReset=0x8000, BMCRSpeed100=0x2000, BMCRNWayEnable=0x1000,
167 BMCRRestartNWay=0x0200, BMCRDuplex=0x0100,
171 CSCR_LinkOKBit=0x0400, CSCR_LinkChangeBit=0x0800,
172 CSCR_LinkStatusBits=0x0f000, CSCR_LinkDownOffCmd=0x003c0,
173 CSCR_LinkDownCmd=0x0f3c0,
176 /* Bits in RxConfig. */
179 AcceptErr=0x20, AcceptRunt=0x10, AcceptBroadcast=0x08,
180 AcceptMulticast=0x04, AcceptMyPhys=0x02, AcceptAllPhys=0x01,
184 static unsigned int cur_rx,cur_tx;
186 /* The RTL8139 can only transmit from a contiguous, aligned memory block. */
187 static unsigned char tx_buffer[TX_BUF_SIZE] __attribute__((aligned(4)));
188 static unsigned char rx_ring[RX_BUF_LEN+16] __attribute__((aligned(4)));
190 static int rtl8139_probe(struct eth_device *dev, bd_t *bis);
191 static int read_eeprom(int location, int addr_len);
192 static void rtl_reset(struct eth_device *dev);
193 static int rtl_transmit(struct eth_device *dev, volatile void *packet, int length);
194 static int rtl_poll(struct eth_device *dev);
195 static void rtl_disable(struct eth_device *dev);
197 static struct pci_device_id supported[] = {
198 {PCI_VENDOR_ID_REALTEK, PCI_DEVICE_ID_REALTEK_8139},
202 int rtl8139_initialize(bd_t *bis)
206 struct eth_device *dev;
212 if ((devno = pci_find_devices(supported, idx++)) < 0)
215 pci_read_config_dword(devno, PCI_BASE_ADDRESS_1, &iobase);
218 debug ("rtl8139: REALTEK RTL8139 @0x%x\n", iobase);
220 dev = (struct eth_device *)malloc(sizeof *dev);
222 sprintf (dev->name, "RTL8139#%d", card_number);
224 dev->priv = (void *) devno;
225 dev->iobase = (int)bus_to_phys(iobase);
226 dev->init = rtl8139_probe;
227 dev->halt = rtl_disable;
228 dev->send = rtl_transmit;
229 dev->recv = rtl_poll;
235 pci_write_config_byte (devno, PCI_LATENCY_TIMER, 0x20);
243 static int rtl8139_probe(struct eth_device *dev, bd_t *bis)
246 int speed10, fullduplex;
248 unsigned short *ap = (unsigned short *)dev->enetaddr;
250 ioaddr = dev->iobase;
252 /* Bring the chip out of low-power mode. */
253 outb(0x00, ioaddr + Config1);
255 addr_len = read_eeprom(0,8) == 0x8129 ? 8 : 6;
256 for (i = 0; i < 3; i++)
257 *ap++ = le16_to_cpu (read_eeprom(i + 7, addr_len));
259 speed10 = inb(ioaddr + MediaStatus) & MSRSpeed10;
260 fullduplex = inw(ioaddr + MII_BMCR) & BMCRDuplex;
264 if (inb(ioaddr + MediaStatus) & MSRLinkFail) {
265 printf("Cable not connected or other link failure\n");
272 /* Serial EEPROM section. */
274 /* EEPROM_Ctrl bits. */
275 #define EE_SHIFT_CLK 0x04 /* EEPROM shift clock. */
276 #define EE_CS 0x08 /* EEPROM chip select. */
277 #define EE_DATA_WRITE 0x02 /* EEPROM chip data in. */
278 #define EE_WRITE_0 0x00
279 #define EE_WRITE_1 0x02
280 #define EE_DATA_READ 0x01 /* EEPROM chip data out. */
281 #define EE_ENB (0x80 | EE_CS)
284 Delay between EEPROM clock transitions.
285 No extra delay is needed with 33Mhz PCI, but 66Mhz may change this.
288 #define eeprom_delay() inl(ee_addr)
290 /* The EEPROM commands include the alway-set leading bit. */
291 #define EE_WRITE_CMD (5)
292 #define EE_READ_CMD (6)
293 #define EE_ERASE_CMD (7)
295 static int read_eeprom(int location, int addr_len)
298 unsigned int retval = 0;
299 long ee_addr = ioaddr + Cfg9346;
300 int read_cmd = location | (EE_READ_CMD << addr_len);
302 outb(EE_ENB & ~EE_CS, ee_addr);
303 outb(EE_ENB, ee_addr);
306 /* Shift the read command bits out. */
307 for (i = 4 + addr_len; i >= 0; i--) {
308 int dataval = (read_cmd & (1 << i)) ? EE_DATA_WRITE : 0;
309 outb(EE_ENB | dataval, ee_addr);
311 outb(EE_ENB | dataval | EE_SHIFT_CLK, ee_addr);
314 outb(EE_ENB, ee_addr);
317 for (i = 16; i > 0; i--) {
318 outb(EE_ENB | EE_SHIFT_CLK, ee_addr);
320 retval = (retval << 1) | ((inb(ee_addr) & EE_DATA_READ) ? 1 : 0);
321 outb(EE_ENB, ee_addr);
325 /* Terminate the EEPROM access. */
326 outb(~EE_CS, ee_addr);
331 static const unsigned int rtl8139_rx_config =
332 (RX_BUF_LEN_IDX << 11) |
333 (RX_FIFO_THRESH << 13) |
336 static void set_rx_mode(struct eth_device *dev) {
337 unsigned int mc_filter[2];
340 rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
341 mc_filter[1] = mc_filter[0] = 0xffffffff;
343 outl(rtl8139_rx_config | rx_mode, ioaddr + RxConfig);
345 outl(mc_filter[0], ioaddr + MAR0 + 0);
346 outl(mc_filter[1], ioaddr + MAR0 + 4);
349 static void rtl_reset(struct eth_device *dev)
353 outb(CmdReset, ioaddr + ChipCmd);
358 /* Give the chip 10ms to finish the reset. */
359 for (i=0; i<100; ++i){
360 if ((inb(ioaddr + ChipCmd) & CmdReset) == 0) break;
361 udelay (100); /* wait 100us */
365 for (i = 0; i < ETH_ALEN; i++)
366 outb(dev->enetaddr[i], ioaddr + MAC0 + i);
368 /* Must enable Tx/Rx before setting transfer thresholds! */
369 outb(CmdRxEnb | CmdTxEnb, ioaddr + ChipCmd);
370 outl((RX_FIFO_THRESH<<13) | (RX_BUF_LEN_IDX<<11) | (RX_DMA_BURST<<8),
371 ioaddr + RxConfig); /* accept no frames yet! */
372 outl((TX_DMA_BURST<<8)|0x03000000, ioaddr + TxConfig);
374 /* The Linux driver changes Config1 here to use a different LED pattern
375 * for half duplex or full/autodetect duplex (for full/autodetect, the
376 * outputs are TX/RX, Link10/100, FULL, while for half duplex it uses
377 * TX/RX, Link100, Link10). This is messy, because it doesn't match
378 * the inscription on the mounting bracket. It should not be changed
379 * from the configuration EEPROM default, because the card manufacturer
380 * should have set that to match the card. */
383 printf("rx ring address is %X\n",(unsigned long)rx_ring);
385 outl(phys_to_bus((int)rx_ring), ioaddr + RxBuf);
387 /* If we add multicast support, the MAR0 register would have to be
388 * initialized to 0xffffffffffffffff (two 32 bit accesses). Etherboot
389 * only needs broadcast (for ARP/RARP/BOOTP/DHCP) and unicast. */
391 outb(CmdRxEnb | CmdTxEnb, ioaddr + ChipCmd);
393 outl(rtl8139_rx_config, ioaddr + RxConfig);
395 /* Start the chip's Tx and Rx process. */
396 outl(0, ioaddr + RxMissed);
401 /* Disable all known interrupts by setting the interrupt mask. */
402 outw(0, ioaddr + IntrMask);
405 static int rtl_transmit(struct eth_device *dev, volatile void *packet, int length)
407 unsigned int status, to;
408 unsigned long txstatus;
409 unsigned int len = length;
411 ioaddr = dev->iobase;
413 memcpy((char *)tx_buffer, (char *)packet, (int)length);
416 printf("sending %d bytes\n", len);
419 /* Note: RTL8139 doesn't auto-pad, send minimum payload (another 4
420 * bytes are sent automatically for the FCS, totalling to 64 bytes). */
421 while (len < ETH_ZLEN) {
422 tx_buffer[len++] = '\0';
425 outl(phys_to_bus((int)tx_buffer), ioaddr + TxAddr0 + cur_tx*4);
426 outl(((TX_FIFO_THRESH<<11) & 0x003f0000) | len,
427 ioaddr + TxStatus0 + cur_tx*4);
429 to = currticks() + RTL_TIMEOUT;
432 status = inw(ioaddr + IntrStatus);
433 /* Only acknlowledge interrupt sources we can properly handle
434 * here - the RxOverflow/RxFIFOOver MUST be handled in the
435 * rtl_poll() function. */
436 outw(status & (TxOK | TxErr | PCIErr), ioaddr + IntrStatus);
437 if ((status & (TxOK | TxErr | PCIErr)) != 0) break;
438 } while (currticks() < to);
440 txstatus = inl(ioaddr + TxStatus0 + cur_tx*4);
443 cur_tx = (cur_tx + 1) % NUM_TX_DESC;
445 printf("tx done (%d ticks), status %hX txstatus %X\n",
446 to-currticks(), status, txstatus);
451 printf("tx timeout/error (%d ticks), status %hX txstatus %X\n",
452 currticks()-to, status, txstatus);
460 static int rtl_poll(struct eth_device *dev)
463 unsigned int ring_offs;
464 unsigned int rx_size, rx_status;
467 ioaddr = dev->iobase;
469 if (inb(ioaddr + ChipCmd) & RxBufEmpty) {
473 status = inw(ioaddr + IntrStatus);
474 /* See below for the rest of the interrupt acknowledges. */
475 outw(status & ~(RxFIFOOver | RxOverflow | RxOK), ioaddr + IntrStatus);
478 printf("rtl_poll: int %hX ", status);
481 ring_offs = cur_rx % RX_BUF_LEN;
482 rx_status = *(unsigned int*)KSEG1ADDR((rx_ring + ring_offs));
483 rx_size = rx_status >> 16;
486 if ((rx_status & (RxBadSymbol|RxRunt|RxTooLong|RxCRCErr|RxBadAlign)) ||
487 (rx_size < ETH_ZLEN) || (rx_size > ETH_FRAME_LEN + 4)) {
488 printf("rx error %hX\n", rx_status);
489 rtl_reset(dev); /* this clears all interrupts still pending */
493 /* Received a good packet */
494 length = rx_size - 4; /* no one cares about the FCS */
495 if (ring_offs+4+rx_size-4 > RX_BUF_LEN) {
496 int semi_count = RX_BUF_LEN - ring_offs - 4;
497 unsigned char rxdata[RX_BUF_LEN];
499 memcpy(rxdata, rx_ring + ring_offs + 4, semi_count);
500 memcpy(&(rxdata[semi_count]), rx_ring, rx_size-4-semi_count);
502 NetReceive(rxdata, length);
504 printf("rx packet %d+%d bytes", semi_count,rx_size-4-semi_count);
507 NetReceive(rx_ring + ring_offs + 4, length);
509 printf("rx packet %d bytes", rx_size-4);
513 cur_rx = (cur_rx + rx_size + 4 + 3) & ~3;
514 outw(cur_rx - 16, ioaddr + RxBufPtr);
515 /* See RTL8139 Programming Guide V0.1 for the official handling of
516 * Rx overflow situations. The document itself contains basically no
517 * usable information, except for a few exception handling rules. */
518 outw(status & (RxFIFOOver | RxOverflow | RxOK), ioaddr + IntrStatus);
522 static void rtl_disable(struct eth_device *dev)
526 ioaddr = dev->iobase;
529 outb(CmdReset, ioaddr + ChipCmd);
531 /* Give the chip 10ms to finish the reset. */
532 for (i=0; i<100; ++i){
533 if ((inb(ioaddr + ChipCmd) & CmdReset) == 0) break;
534 udelay (100); /* wait 100us */
537 #endif /* CFG_CMD_NET && CONFIG_NET_MULTI && CONFIG_RTL8139 */