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_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},
199 {PCI_VENDOR_ID_DLINK, PCI_DEVICE_ID_DLINK_8139},
203 int rtl8139_initialize(bd_t *bis)
207 struct eth_device *dev;
213 if ((devno = pci_find_devices(supported, idx++)) < 0)
216 pci_read_config_dword(devno, PCI_BASE_ADDRESS_1, &iobase);
219 debug ("rtl8139: REALTEK RTL8139 @0x%x\n", iobase);
221 dev = (struct eth_device *)malloc(sizeof *dev);
223 sprintf (dev->name, "RTL8139#%d", card_number);
225 dev->priv = (void *) devno;
226 dev->iobase = (int)bus_to_phys(iobase);
227 dev->init = rtl8139_probe;
228 dev->halt = rtl_disable;
229 dev->send = rtl_transmit;
230 dev->recv = rtl_poll;
236 pci_write_config_byte (devno, PCI_LATENCY_TIMER, 0x20);
244 static int rtl8139_probe(struct eth_device *dev, bd_t *bis)
247 int speed10, fullduplex;
249 unsigned short *ap = (unsigned short *)dev->enetaddr;
251 ioaddr = dev->iobase;
253 /* Bring the chip out of low-power mode. */
254 outb(0x00, ioaddr + Config1);
256 addr_len = read_eeprom(0,8) == 0x8129 ? 8 : 6;
257 for (i = 0; i < 3; i++)
258 *ap++ = le16_to_cpu (read_eeprom(i + 7, addr_len));
260 speed10 = inb(ioaddr + MediaStatus) & MSRSpeed10;
261 fullduplex = inw(ioaddr + MII_BMCR) & BMCRDuplex;
265 if (inb(ioaddr + MediaStatus) & MSRLinkFail) {
266 printf("Cable not connected or other link failure\n");
273 /* Serial EEPROM section. */
275 /* EEPROM_Ctrl bits. */
276 #define EE_SHIFT_CLK 0x04 /* EEPROM shift clock. */
277 #define EE_CS 0x08 /* EEPROM chip select. */
278 #define EE_DATA_WRITE 0x02 /* EEPROM chip data in. */
279 #define EE_WRITE_0 0x00
280 #define EE_WRITE_1 0x02
281 #define EE_DATA_READ 0x01 /* EEPROM chip data out. */
282 #define EE_ENB (0x80 | EE_CS)
285 Delay between EEPROM clock transitions.
286 No extra delay is needed with 33Mhz PCI, but 66Mhz may change this.
289 #define eeprom_delay() inl(ee_addr)
291 /* The EEPROM commands include the alway-set leading bit. */
292 #define EE_WRITE_CMD (5)
293 #define EE_READ_CMD (6)
294 #define EE_ERASE_CMD (7)
296 static int read_eeprom(int location, int addr_len)
299 unsigned int retval = 0;
300 long ee_addr = ioaddr + Cfg9346;
301 int read_cmd = location | (EE_READ_CMD << addr_len);
303 outb(EE_ENB & ~EE_CS, ee_addr);
304 outb(EE_ENB, ee_addr);
307 /* Shift the read command bits out. */
308 for (i = 4 + addr_len; i >= 0; i--) {
309 int dataval = (read_cmd & (1 << i)) ? EE_DATA_WRITE : 0;
310 outb(EE_ENB | dataval, ee_addr);
312 outb(EE_ENB | dataval | EE_SHIFT_CLK, ee_addr);
315 outb(EE_ENB, ee_addr);
318 for (i = 16; i > 0; i--) {
319 outb(EE_ENB | EE_SHIFT_CLK, ee_addr);
321 retval = (retval << 1) | ((inb(ee_addr) & EE_DATA_READ) ? 1 : 0);
322 outb(EE_ENB, ee_addr);
326 /* Terminate the EEPROM access. */
327 outb(~EE_CS, ee_addr);
332 static const unsigned int rtl8139_rx_config =
333 (RX_BUF_LEN_IDX << 11) |
334 (RX_FIFO_THRESH << 13) |
337 static void set_rx_mode(struct eth_device *dev) {
338 unsigned int mc_filter[2];
341 rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
342 mc_filter[1] = mc_filter[0] = 0xffffffff;
344 outl(rtl8139_rx_config | rx_mode, ioaddr + RxConfig);
346 outl(mc_filter[0], ioaddr + MAR0 + 0);
347 outl(mc_filter[1], ioaddr + MAR0 + 4);
350 static void rtl_reset(struct eth_device *dev)
354 outb(CmdReset, ioaddr + ChipCmd);
359 /* Give the chip 10ms to finish the reset. */
360 for (i=0; i<100; ++i){
361 if ((inb(ioaddr + ChipCmd) & CmdReset) == 0) break;
362 udelay (100); /* wait 100us */
366 for (i = 0; i < ETH_ALEN; i++)
367 outb(dev->enetaddr[i], ioaddr + MAC0 + i);
369 /* Must enable Tx/Rx before setting transfer thresholds! */
370 outb(CmdRxEnb | CmdTxEnb, ioaddr + ChipCmd);
371 outl((RX_FIFO_THRESH<<13) | (RX_BUF_LEN_IDX<<11) | (RX_DMA_BURST<<8),
372 ioaddr + RxConfig); /* accept no frames yet! */
373 outl((TX_DMA_BURST<<8)|0x03000000, ioaddr + TxConfig);
375 /* The Linux driver changes Config1 here to use a different LED pattern
376 * for half duplex or full/autodetect duplex (for full/autodetect, the
377 * outputs are TX/RX, Link10/100, FULL, while for half duplex it uses
378 * TX/RX, Link100, Link10). This is messy, because it doesn't match
379 * the inscription on the mounting bracket. It should not be changed
380 * from the configuration EEPROM default, because the card manufacturer
381 * should have set that to match the card. */
384 printf("rx ring address is %X\n",(unsigned long)rx_ring);
386 outl(phys_to_bus((int)rx_ring), ioaddr + RxBuf);
388 /* If we add multicast support, the MAR0 register would have to be
389 * initialized to 0xffffffffffffffff (two 32 bit accesses). Etherboot
390 * only needs broadcast (for ARP/RARP/BOOTP/DHCP) and unicast. */
392 outb(CmdRxEnb | CmdTxEnb, ioaddr + ChipCmd);
394 outl(rtl8139_rx_config, ioaddr + RxConfig);
396 /* Start the chip's Tx and Rx process. */
397 outl(0, ioaddr + RxMissed);
402 /* Disable all known interrupts by setting the interrupt mask. */
403 outw(0, ioaddr + IntrMask);
406 static int rtl_transmit(struct eth_device *dev, volatile void *packet, int length)
408 unsigned int status, to;
409 unsigned long txstatus;
410 unsigned int len = length;
412 ioaddr = dev->iobase;
414 memcpy((char *)tx_buffer, (char *)packet, (int)length);
417 printf("sending %d bytes\n", len);
420 /* Note: RTL8139 doesn't auto-pad, send minimum payload (another 4
421 * bytes are sent automatically for the FCS, totalling to 64 bytes). */
422 while (len < ETH_ZLEN) {
423 tx_buffer[len++] = '\0';
426 outl(phys_to_bus((int)tx_buffer), ioaddr + TxAddr0 + cur_tx*4);
427 outl(((TX_FIFO_THRESH<<11) & 0x003f0000) | len,
428 ioaddr + TxStatus0 + cur_tx*4);
430 to = currticks() + RTL_TIMEOUT;
433 status = inw(ioaddr + IntrStatus);
434 /* Only acknlowledge interrupt sources we can properly handle
435 * here - the RxOverflow/RxFIFOOver MUST be handled in the
436 * rtl_poll() function. */
437 outw(status & (TxOK | TxErr | PCIErr), ioaddr + IntrStatus);
438 if ((status & (TxOK | TxErr | PCIErr)) != 0) break;
439 } while (currticks() < to);
441 txstatus = inl(ioaddr + TxStatus0 + cur_tx*4);
444 cur_tx = (cur_tx + 1) % NUM_TX_DESC;
446 printf("tx done (%d ticks), status %hX txstatus %X\n",
447 to-currticks(), status, txstatus);
452 printf("tx timeout/error (%d ticks), status %hX txstatus %X\n",
453 currticks()-to, status, txstatus);
461 static int rtl_poll(struct eth_device *dev)
464 unsigned int ring_offs;
465 unsigned int rx_size, rx_status;
468 ioaddr = dev->iobase;
470 if (inb(ioaddr + ChipCmd) & RxBufEmpty) {
474 status = inw(ioaddr + IntrStatus);
475 /* See below for the rest of the interrupt acknowledges. */
476 outw(status & ~(RxFIFOOver | RxOverflow | RxOK), ioaddr + IntrStatus);
479 printf("rtl_poll: int %hX ", status);
482 ring_offs = cur_rx % RX_BUF_LEN;
483 rx_status = *(unsigned int*)KSEG1ADDR((rx_ring + ring_offs));
484 rx_size = rx_status >> 16;
487 if ((rx_status & (RxBadSymbol|RxRunt|RxTooLong|RxCRCErr|RxBadAlign)) ||
488 (rx_size < ETH_ZLEN) || (rx_size > ETH_FRAME_LEN + 4)) {
489 printf("rx error %hX\n", rx_status);
490 rtl_reset(dev); /* this clears all interrupts still pending */
494 /* Received a good packet */
495 length = rx_size - 4; /* no one cares about the FCS */
496 if (ring_offs+4+rx_size-4 > RX_BUF_LEN) {
497 int semi_count = RX_BUF_LEN - ring_offs - 4;
498 unsigned char rxdata[RX_BUF_LEN];
500 memcpy(rxdata, rx_ring + ring_offs + 4, semi_count);
501 memcpy(&(rxdata[semi_count]), rx_ring, rx_size-4-semi_count);
503 NetReceive(rxdata, length);
505 printf("rx packet %d+%d bytes", semi_count,rx_size-4-semi_count);
508 NetReceive(rx_ring + ring_offs + 4, length);
510 printf("rx packet %d bytes", rx_size-4);
514 cur_rx = (cur_rx + rx_size + 4 + 3) & ~3;
515 outw(cur_rx - 16, ioaddr + RxBufPtr);
516 /* See RTL8139 Programming Guide V0.1 for the official handling of
517 * Rx overflow situations. The document itself contains basically no
518 * usable information, except for a few exception handling rules. */
519 outw(status & (RxFIFOOver | RxOverflow | RxOK), ioaddr + IntrStatus);
523 static void rtl_disable(struct eth_device *dev)
527 ioaddr = dev->iobase;
530 outb(CmdReset, ioaddr + ChipCmd);
532 /* Give the chip 10ms to finish the reset. */
533 for (i=0; i<100; ++i){
534 if ((inb(ioaddr + ChipCmd) & CmdReset) == 0) break;
535 udelay (100); /* wait 100us */
538 #endif /* CFG_CMD_NET && CONFIG_NET_MULTI && CONFIG_RTL8139 */