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.
81 #define RTL_TIMEOUT 100000
83 #define ETH_FRAME_LEN 1514
87 /* PCI Tuning Parameters
88 Threshold is bytes transferred to chip before transmission starts. */
89 #define TX_FIFO_THRESH 256 /* In bytes, rounded down to 32 byte units. */
90 #define RX_FIFO_THRESH 4 /* Rx buffer level before first PCI xfer. */
91 #define RX_DMA_BURST 4 /* Maximum PCI burst, '4' is 256 bytes */
92 #define TX_DMA_BURST 4 /* Calculate as 16<<val. */
93 #define NUM_TX_DESC 4 /* Number of Tx descriptor registers. */
94 #define TX_BUF_SIZE ETH_FRAME_LEN /* FCS is added by the chip */
95 #define RX_BUF_LEN_IDX 0 /* 0, 1, 2 is allowed - 8,16,32K rx buffer */
96 #define RX_BUF_LEN (8192 << RX_BUF_LEN_IDX)
98 #define DEBUG_TX 0 /* set to 1 to enable debug code */
99 #define DEBUG_RX 0 /* set to 1 to enable debug code */
101 #define bus_to_phys(a) pci_mem_to_phys((pci_dev_t)dev->priv, a)
102 #define phys_to_bus(a) pci_phys_to_mem((pci_dev_t)dev->priv, a)
104 /* Symbolic offsets to registers. */
105 enum RTL8139_registers {
106 MAC0=0, /* Ethernet hardware address. */
107 MAR0=8, /* Multicast filter. */
108 TxStatus0=0x10, /* Transmit status (four 32bit registers). */
109 TxAddr0=0x20, /* Tx descriptors (also four 32bit). */
110 RxBuf=0x30, RxEarlyCnt=0x34, RxEarlyStatus=0x36,
111 ChipCmd=0x37, RxBufPtr=0x38, RxBufAddr=0x3A,
112 IntrMask=0x3C, IntrStatus=0x3E,
113 TxConfig=0x40, RxConfig=0x44,
114 Timer=0x48, /* general-purpose counter. */
115 RxMissed=0x4C, /* 24 bits valid, write clears. */
116 Cfg9346=0x50, Config0=0x51, Config1=0x52,
117 TimerIntrReg=0x54, /* intr if gp counter reaches this value */
121 RevisionID=0x5E, /* revision of the RTL8139 chip */
123 MII_BMCR=0x62, MII_BMSR=0x64, NWayAdvert=0x66, NWayLPAR=0x68,
125 DisconnectCnt=0x6C, FalseCarrierCnt=0x6E,
127 RxCnt=0x72, /* packet received counter */
128 CSCR=0x74, /* chip status and configuration register */
129 PhyParm1=0x78,TwisterParm=0x7c,PhyParm2=0x80, /* undocumented */
130 /* from 0x84 onwards are a number of power management/wakeup frame
131 * definitions we will probably never need to know about. */
135 CmdReset=0x10, CmdRxEnb=0x08, CmdTxEnb=0x04, RxBufEmpty=0x01, };
137 /* Interrupt register bits, using my own meaningful names. */
138 enum IntrStatusBits {
139 PCIErr=0x8000, PCSTimeout=0x4000, CableLenChange= 0x2000,
140 RxFIFOOver=0x40, RxUnderrun=0x20, RxOverflow=0x10,
141 TxErr=0x08, TxOK=0x04, RxErr=0x02, RxOK=0x01,
144 TxHostOwns=0x2000, TxUnderrun=0x4000, TxStatOK=0x8000,
145 TxOutOfWindow=0x20000000, TxAborted=0x40000000,
146 TxCarrierLost=0x80000000,
149 RxMulticast=0x8000, RxPhysical=0x4000, RxBroadcast=0x2000,
150 RxBadSymbol=0x0020, RxRunt=0x0010, RxTooLong=0x0008, RxCRCErr=0x0004,
151 RxBadAlign=0x0002, RxStatusOK=0x0001,
154 enum MediaStatusBits {
155 MSRTxFlowEnable=0x80, MSRRxFlowEnable=0x40, MSRSpeed10=0x08,
156 MSRLinkFail=0x04, MSRRxPauseFlag=0x02, MSRTxPauseFlag=0x01,
160 BMCRReset=0x8000, BMCRSpeed100=0x2000, BMCRNWayEnable=0x1000,
161 BMCRRestartNWay=0x0200, BMCRDuplex=0x0100,
165 CSCR_LinkOKBit=0x0400, CSCR_LinkChangeBit=0x0800,
166 CSCR_LinkStatusBits=0x0f000, CSCR_LinkDownOffCmd=0x003c0,
167 CSCR_LinkDownCmd=0x0f3c0,
170 /* Bits in RxConfig. */
173 AcceptErr=0x20, AcceptRunt=0x10, AcceptBroadcast=0x08,
174 AcceptMulticast=0x04, AcceptMyPhys=0x02, AcceptAllPhys=0x01,
178 static unsigned int cur_rx,cur_tx;
180 /* The RTL8139 can only transmit from a contiguous, aligned memory block. */
181 static unsigned char tx_buffer[TX_BUF_SIZE] __attribute__((aligned(4)));
182 static unsigned char rx_ring[RX_BUF_LEN+16] __attribute__((aligned(4)));
184 static int rtl8139_probe(struct eth_device *dev, bd_t *bis);
185 static int read_eeprom(int location, int addr_len);
186 static void rtl_reset(struct eth_device *dev);
187 static int rtl_transmit(struct eth_device *dev, volatile void *packet, int length);
188 static int rtl_poll(struct eth_device *dev);
189 static void rtl_disable(struct eth_device *dev);
190 #ifdef CONFIG_MCAST_TFTP/* This driver already accepts all b/mcast */
191 static int rtl_bcast_addr (struct eth_device *dev, u8 bcast_mac, u8 set)
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 printf("Can not allocate memory of rtl8139\n");
226 memset(dev, 0, sizeof(*dev));
228 sprintf (dev->name, "RTL8139#%d", card_number);
230 dev->priv = (void *) devno;
231 dev->iobase = (int)bus_to_phys(iobase);
232 dev->init = rtl8139_probe;
233 dev->halt = rtl_disable;
234 dev->send = rtl_transmit;
235 dev->recv = rtl_poll;
236 #ifdef CONFIG_MCAST_TFTP
237 dev->mcast = rtl_bcast_addr;
244 pci_write_config_byte (devno, PCI_LATENCY_TIMER, 0x20);
252 static int rtl8139_probe(struct eth_device *dev, bd_t *bis)
256 unsigned short *ap = (unsigned short *)dev->enetaddr;
258 ioaddr = dev->iobase;
260 /* Bring the chip out of low-power mode. */
261 outb(0x00, ioaddr + Config1);
263 addr_len = read_eeprom(0,8) == 0x8129 ? 8 : 6;
264 for (i = 0; i < 3; i++)
265 *ap++ = le16_to_cpu (read_eeprom(i + 7, addr_len));
269 if (inb(ioaddr + MediaStatus) & MSRLinkFail) {
270 printf("Cable not connected or other link failure\n");
277 /* Serial EEPROM section. */
279 /* EEPROM_Ctrl bits. */
280 #define EE_SHIFT_CLK 0x04 /* EEPROM shift clock. */
281 #define EE_CS 0x08 /* EEPROM chip select. */
282 #define EE_DATA_WRITE 0x02 /* EEPROM chip data in. */
283 #define EE_WRITE_0 0x00
284 #define EE_WRITE_1 0x02
285 #define EE_DATA_READ 0x01 /* EEPROM chip data out. */
286 #define EE_ENB (0x80 | EE_CS)
289 Delay between EEPROM clock transitions.
290 No extra delay is needed with 33MHz PCI, but 66MHz may change this.
293 #define eeprom_delay() inl(ee_addr)
295 /* The EEPROM commands include the alway-set leading bit. */
296 #define EE_WRITE_CMD (5)
297 #define EE_READ_CMD (6)
298 #define EE_ERASE_CMD (7)
300 static int read_eeprom(int location, int addr_len)
303 unsigned int retval = 0;
304 long ee_addr = ioaddr + Cfg9346;
305 int read_cmd = location | (EE_READ_CMD << addr_len);
307 outb(EE_ENB & ~EE_CS, ee_addr);
308 outb(EE_ENB, ee_addr);
311 /* Shift the read command bits out. */
312 for (i = 4 + addr_len; i >= 0; i--) {
313 int dataval = (read_cmd & (1 << i)) ? EE_DATA_WRITE : 0;
314 outb(EE_ENB | dataval, ee_addr);
316 outb(EE_ENB | dataval | EE_SHIFT_CLK, ee_addr);
319 outb(EE_ENB, ee_addr);
322 for (i = 16; i > 0; i--) {
323 outb(EE_ENB | EE_SHIFT_CLK, ee_addr);
325 retval = (retval << 1) | ((inb(ee_addr) & EE_DATA_READ) ? 1 : 0);
326 outb(EE_ENB, ee_addr);
330 /* Terminate the EEPROM access. */
331 outb(~EE_CS, ee_addr);
336 static const unsigned int rtl8139_rx_config =
337 (RX_BUF_LEN_IDX << 11) |
338 (RX_FIFO_THRESH << 13) |
341 static void set_rx_mode(struct eth_device *dev) {
342 unsigned int mc_filter[2];
345 rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
346 mc_filter[1] = mc_filter[0] = 0xffffffff;
348 outl(rtl8139_rx_config | rx_mode, ioaddr + RxConfig);
350 outl(mc_filter[0], ioaddr + MAR0 + 0);
351 outl(mc_filter[1], ioaddr + MAR0 + 4);
354 static void rtl_reset(struct eth_device *dev)
358 outb(CmdReset, ioaddr + ChipCmd);
363 /* Give the chip 10ms to finish the reset. */
364 for (i=0; i<100; ++i){
365 if ((inb(ioaddr + ChipCmd) & CmdReset) == 0) break;
366 udelay (100); /* wait 100us */
370 for (i = 0; i < ETH_ALEN; i++)
371 outb(dev->enetaddr[i], ioaddr + MAC0 + i);
373 /* Must enable Tx/Rx before setting transfer thresholds! */
374 outb(CmdRxEnb | CmdTxEnb, ioaddr + ChipCmd);
375 outl((RX_FIFO_THRESH<<13) | (RX_BUF_LEN_IDX<<11) | (RX_DMA_BURST<<8),
376 ioaddr + RxConfig); /* accept no frames yet! */
377 outl((TX_DMA_BURST<<8)|0x03000000, ioaddr + TxConfig);
379 /* The Linux driver changes Config1 here to use a different LED pattern
380 * for half duplex or full/autodetect duplex (for full/autodetect, the
381 * outputs are TX/RX, Link10/100, FULL, while for half duplex it uses
382 * TX/RX, Link100, Link10). This is messy, because it doesn't match
383 * the inscription on the mounting bracket. It should not be changed
384 * from the configuration EEPROM default, because the card manufacturer
385 * should have set that to match the card. */
388 "rx ring address is %lX\n",(unsigned long)rx_ring);
389 flush_cache((unsigned long)rx_ring, RX_BUF_LEN);
390 outl(phys_to_bus((int)rx_ring), ioaddr + RxBuf);
392 /* If we add multicast support, the MAR0 register would have to be
393 * initialized to 0xffffffffffffffff (two 32 bit accesses). Etherboot
394 * only needs broadcast (for ARP/RARP/BOOTP/DHCP) and unicast. */
396 outb(CmdRxEnb | CmdTxEnb, ioaddr + ChipCmd);
398 outl(rtl8139_rx_config, ioaddr + RxConfig);
400 /* Start the chip's Tx and Rx process. */
401 outl(0, ioaddr + RxMissed);
406 /* Disable all known interrupts by setting the interrupt mask. */
407 outw(0, ioaddr + IntrMask);
410 static int rtl_transmit(struct eth_device *dev, volatile void *packet, int length)
413 unsigned long txstatus;
414 unsigned int len = length;
417 ioaddr = dev->iobase;
419 memcpy((char *)tx_buffer, (char *)packet, (int)length);
421 debug_cond(DEBUG_TX, "sending %d bytes\n", len);
423 /* Note: RTL8139 doesn't auto-pad, send minimum payload (another 4
424 * bytes are sent automatically for the FCS, totalling to 64 bytes). */
425 while (len < ETH_ZLEN) {
426 tx_buffer[len++] = '\0';
429 flush_cache((unsigned long)tx_buffer, length);
430 outl(phys_to_bus((int)tx_buffer), ioaddr + TxAddr0 + cur_tx*4);
431 outl(((TX_FIFO_THRESH<<11) & 0x003f0000) | len,
432 ioaddr + TxStatus0 + cur_tx*4);
435 status = inw(ioaddr + IntrStatus);
436 /* Only acknlowledge interrupt sources we can properly handle
437 * here - the RxOverflow/RxFIFOOver MUST be handled in the
438 * rtl_poll() function. */
439 outw(status & (TxOK | TxErr | PCIErr), ioaddr + IntrStatus);
440 if ((status & (TxOK | TxErr | PCIErr)) != 0) break;
442 } while (i++ < RTL_TIMEOUT);
444 txstatus = inl(ioaddr + TxStatus0 + cur_tx*4);
447 cur_tx = (cur_tx + 1) % NUM_TX_DESC;
450 "tx done, status %hX txstatus %lX\n",
457 "tx timeout/error (%d usecs), status %hX txstatus %lX\n",
458 10*i, status, txstatus);
466 static int rtl_poll(struct eth_device *dev)
469 unsigned int ring_offs;
470 unsigned int rx_size, rx_status;
473 ioaddr = dev->iobase;
475 if (inb(ioaddr + ChipCmd) & RxBufEmpty) {
479 status = inw(ioaddr + IntrStatus);
480 /* See below for the rest of the interrupt acknowledges. */
481 outw(status & ~(RxFIFOOver | RxOverflow | RxOK), ioaddr + IntrStatus);
483 debug_cond(DEBUG_RX, "rtl_poll: int %hX ", status);
485 ring_offs = cur_rx % RX_BUF_LEN;
486 /* ring_offs is guaranteed being 4-byte aligned */
487 rx_status = le32_to_cpu(*(unsigned int *)(rx_ring + ring_offs));
488 rx_size = rx_status >> 16;
491 if ((rx_status & (RxBadSymbol|RxRunt|RxTooLong|RxCRCErr|RxBadAlign)) ||
492 (rx_size < ETH_ZLEN) || (rx_size > ETH_FRAME_LEN + 4)) {
493 printf("rx error %hX\n", rx_status);
494 rtl_reset(dev); /* this clears all interrupts still pending */
498 /* Received a good packet */
499 length = rx_size - 4; /* no one cares about the FCS */
500 if (ring_offs+4+rx_size-4 > RX_BUF_LEN) {
501 int semi_count = RX_BUF_LEN - ring_offs - 4;
502 unsigned char rxdata[RX_BUF_LEN];
504 memcpy(rxdata, rx_ring + ring_offs + 4, semi_count);
505 memcpy(&(rxdata[semi_count]), rx_ring, rx_size-4-semi_count);
507 NetReceive(rxdata, length);
508 debug_cond(DEBUG_RX, "rx packet %d+%d bytes",
509 semi_count, rx_size-4-semi_count);
511 NetReceive(rx_ring + ring_offs + 4, length);
512 debug_cond(DEBUG_RX, "rx packet %d bytes", rx_size-4);
514 flush_cache((unsigned long)rx_ring, RX_BUF_LEN);
516 cur_rx = (cur_rx + rx_size + 4 + 3) & ~3;
517 outw(cur_rx - 16, ioaddr + RxBufPtr);
518 /* See RTL8139 Programming Guide V0.1 for the official handling of
519 * Rx overflow situations. The document itself contains basically no
520 * usable information, except for a few exception handling rules. */
521 outw(status & (RxFIFOOver | RxOverflow | RxOK), ioaddr + IntrStatus);
525 static void rtl_disable(struct eth_device *dev)
529 ioaddr = dev->iobase;
532 outb(CmdReset, ioaddr + ChipCmd);
534 /* Give the chip 10ms to finish the reset. */
535 for (i=0; i<100; ++i){
536 if ((inb(ioaddr + ChipCmd) & CmdReset) == 0) break;
537 udelay (100); /* wait 100us */