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63f34912 WD |
1 | /* |
2 | * rtl8139.c : U-Boot driver for the RealTek RTL8139 | |
3 | * | |
4 | * Masami Komiya (mkomiya@sonare.it) | |
5 | * | |
6 | * Most part is taken from rtl8139.c of etherboot | |
7 | * | |
8 | */ | |
9 | ||
10 | /* rtl8139.c - etherboot driver for the Realtek 8139 chipset | |
11 | ||
12 | ported from the linux driver written by Donald Becker | |
13 | by Rainer Bawidamann (Rainer.Bawidamann@informatik.uni-ulm.de) 1999 | |
14 | ||
15 | This software may be used and distributed according to the terms | |
16 | of the GNU Public License, incorporated herein by reference. | |
17 | ||
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) | |
21 | ||
22 | */ | |
23 | ||
24 | /*********************************************************************/ | |
25 | /* Revision History */ | |
26 | /*********************************************************************/ | |
27 | ||
28 | /* | |
29 | 28 Dec 2002 ken_yap@users.sourceforge.net (Ken Yap) | |
30 | Put in virt_to_bus calls to allow Etherboot relocation. | |
31 | ||
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. | |
35 | ||
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 | |
b6e4c403 | 47 | variables). Hopefully fixed rtl_poll() once and for all. The symptoms |
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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 | |
b6e4c403 | 56 | interrupts. This confused the RTL8139 thoroughly. It destroyed the |
63f34912 WD |
57 | Rx ring contents by dumping the 2K FIFO contents right where we wanted to |
58 | get the next packet. Oh well, what fun. | |
59 | ||
b6e4c403 | 60 | 18 Jan 2000 mdc@thinguin.org (Marty Connor) |
63f34912 WD |
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 | |
b6e4c403 | 64 | save buffer space. This should decrease driver size and avoid |
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65 | corruption because of exceeding 32K during runtime. |
66 | ||
b6e4c403 | 67 | 28 Jul 1999 (Matthias Meixner - meixner@rbg.informatik.tu-darmstadt.de) |
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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. | |
71 | ||
72 | */ | |
73 | ||
74 | #include <common.h> | |
75 | #include <malloc.h> | |
76 | #include <net.h> | |
77 | #include <asm/io.h> | |
78 | #include <pci.h> | |
79 | ||
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80 | #if (CONFIG_COMMANDS & CFG_CMD_NET) && defined(CONFIG_NET_MULTI) && \ |
81 | defined(CONFIG_RTL8139) | |
82 | ||
83 | #define TICKS_PER_SEC CFG_HZ | |
84 | #define TICKS_PER_MS (TICKS_PER_SEC/1000) | |
85 | ||
86 | #define RTL_TIMEOUT (1*TICKS_PER_SEC) | |
87 | ||
88 | #define ETH_FRAME_LEN 1514 | |
89 | #define ETH_ALEN 6 | |
90 | #define ETH_ZLEN 60 | |
91 | ||
92 | /* PCI Tuning Parameters | |
93 | Threshold is bytes transferred to chip before transmission starts. */ | |
b6e4c403 WD |
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. */ | |
63f34912 WD |
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) | |
102 | ||
103 | #undef DEBUG_TX | |
104 | #undef DEBUG_RX | |
105 | ||
106 | #define currticks() get_timer(0) | |
b6e4c403 WD |
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) | |
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109 | |
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 */ | |
124 | MediaStatus=0x58, | |
125 | Config3=0x59, | |
126 | MultiIntr=0x5C, | |
127 | RevisionID=0x5E, /* revision of the RTL8139 chip */ | |
128 | TxSummary=0x60, | |
129 | MII_BMCR=0x62, MII_BMSR=0x64, NWayAdvert=0x66, NWayLPAR=0x68, | |
130 | NWayExpansion=0x6A, | |
131 | DisconnectCnt=0x6C, FalseCarrierCnt=0x6E, | |
132 | NWayTestReg=0x70, | |
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. */ | |
138 | }; | |
139 | ||
140 | enum ChipCmdBits { | |
141 | CmdReset=0x10, CmdRxEnb=0x08, CmdTxEnb=0x04, RxBufEmpty=0x01, }; | |
142 | ||
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, | |
148 | }; | |
149 | enum TxStatusBits { | |
150 | TxHostOwns=0x2000, TxUnderrun=0x4000, TxStatOK=0x8000, | |
151 | TxOutOfWindow=0x20000000, TxAborted=0x40000000, | |
152 | TxCarrierLost=0x80000000, | |
153 | }; | |
154 | enum RxStatusBits { | |
155 | RxMulticast=0x8000, RxPhysical=0x4000, RxBroadcast=0x2000, | |
156 | RxBadSymbol=0x0020, RxRunt=0x0010, RxTooLong=0x0008, RxCRCErr=0x0004, | |
157 | RxBadAlign=0x0002, RxStatusOK=0x0001, | |
158 | }; | |
159 | ||
160 | enum MediaStatusBits { | |
161 | MSRTxFlowEnable=0x80, MSRRxFlowEnable=0x40, MSRSpeed10=0x08, | |
162 | MSRLinkFail=0x04, MSRRxPauseFlag=0x02, MSRTxPauseFlag=0x01, | |
163 | }; | |
164 | ||
165 | enum MIIBMCRBits { | |
166 | BMCRReset=0x8000, BMCRSpeed100=0x2000, BMCRNWayEnable=0x1000, | |
167 | BMCRRestartNWay=0x0200, BMCRDuplex=0x0100, | |
168 | }; | |
169 | ||
170 | enum CSCRBits { | |
171 | CSCR_LinkOKBit=0x0400, CSCR_LinkChangeBit=0x0800, | |
172 | CSCR_LinkStatusBits=0x0f000, CSCR_LinkDownOffCmd=0x003c0, | |
173 | CSCR_LinkDownCmd=0x0f3c0, | |
174 | }; | |
175 | ||
176 | /* Bits in RxConfig. */ | |
177 | enum rx_mode_bits { | |
178 | RxCfgWrap=0x80, | |
179 | AcceptErr=0x20, AcceptRunt=0x10, AcceptBroadcast=0x08, | |
180 | AcceptMulticast=0x04, AcceptMyPhys=0x02, AcceptAllPhys=0x01, | |
181 | }; | |
182 | ||
183 | static int ioaddr; | |
184 | static unsigned int cur_rx,cur_tx; | |
185 | ||
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))); | |
189 | ||
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); | |
196 | ||
197 | static struct pci_device_id supported[] = { | |
198 | {PCI_VENDOR_ID_REALTEK, PCI_DEVICE_ID_REALTEK_8139}, | |
199 | {} | |
200 | }; | |
201 | ||
202 | int rtl8139_initialize(bd_t *bis) | |
203 | { | |
204 | pci_dev_t devno; | |
205 | int card_number = 0; | |
206 | struct eth_device *dev; | |
207 | u32 iobase; | |
208 | int idx=0; | |
209 | ||
210 | while(1){ | |
211 | /* Find RTL8139 */ | |
212 | if ((devno = pci_find_devices(supported, idx++)) < 0) | |
213 | break; | |
214 | ||
215 | pci_read_config_dword(devno, PCI_BASE_ADDRESS_1, &iobase); | |
216 | iobase &= ~0xf; | |
217 | ||
218 | debug ("rtl8139: REALTEK RTL8139 @0x%x\n", iobase); | |
219 | ||
220 | dev = (struct eth_device *)malloc(sizeof *dev); | |
221 | ||
222 | sprintf (dev->name, "RTL8139#%d", card_number); | |
223 | ||
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; | |
230 | ||
231 | eth_register (dev); | |
232 | ||
233 | card_number++; | |
234 | ||
235 | pci_write_config_byte (devno, PCI_LATENCY_TIMER, 0x20); | |
236 | ||
237 | udelay (10 * 1000); | |
238 | } | |
239 | ||
240 | return card_number; | |
241 | } | |
242 | ||
243 | static int rtl8139_probe(struct eth_device *dev, bd_t *bis) | |
244 | { | |
245 | int i; | |
246 | int speed10, fullduplex; | |
247 | int addr_len; | |
248 | unsigned short *ap = (unsigned short *)dev->enetaddr; | |
249 | ||
250 | ioaddr = dev->iobase; | |
251 | ||
252 | /* Bring the chip out of low-power mode. */ | |
253 | outb(0x00, ioaddr + Config1); | |
254 | ||
255 | addr_len = read_eeprom(0,8) == 0x8129 ? 8 : 6; | |
256 | for (i = 0; i < 3; i++) | |
756f586a | 257 | *ap++ = le16_to_cpu (read_eeprom(i + 7, addr_len)); |
63f34912 WD |
258 | |
259 | speed10 = inb(ioaddr + MediaStatus) & MSRSpeed10; | |
260 | fullduplex = inw(ioaddr + MII_BMCR) & BMCRDuplex; | |
261 | ||
262 | rtl_reset(dev); | |
263 | ||
264 | if (inb(ioaddr + MediaStatus) & MSRLinkFail) { | |
265 | printf("Cable not connected or other link failure\n"); | |
266 | return(0); | |
267 | } | |
268 | ||
269 | return 1; | |
270 | } | |
271 | ||
272 | /* Serial EEPROM section. */ | |
273 | ||
274 | /* EEPROM_Ctrl bits. */ | |
b6e4c403 WD |
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. */ | |
63f34912 WD |
281 | #define EE_ENB (0x80 | EE_CS) |
282 | ||
283 | /* | |
284 | Delay between EEPROM clock transitions. | |
285 | No extra delay is needed with 33Mhz PCI, but 66Mhz may change this. | |
286 | */ | |
287 | ||
b6e4c403 | 288 | #define eeprom_delay() inl(ee_addr) |
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289 | |
290 | /* The EEPROM commands include the alway-set leading bit. */ | |
b6e4c403 WD |
291 | #define EE_WRITE_CMD (5) |
292 | #define EE_READ_CMD (6) | |
293 | #define EE_ERASE_CMD (7) | |
63f34912 WD |
294 | |
295 | static int read_eeprom(int location, int addr_len) | |
296 | { | |
297 | int i; | |
298 | unsigned int retval = 0; | |
299 | long ee_addr = ioaddr + Cfg9346; | |
300 | int read_cmd = location | (EE_READ_CMD << addr_len); | |
301 | ||
302 | outb(EE_ENB & ~EE_CS, ee_addr); | |
303 | outb(EE_ENB, ee_addr); | |
304 | eeprom_delay(); | |
305 | ||
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); | |
310 | eeprom_delay(); | |
311 | outb(EE_ENB | dataval | EE_SHIFT_CLK, ee_addr); | |
312 | eeprom_delay(); | |
313 | } | |
314 | outb(EE_ENB, ee_addr); | |
315 | eeprom_delay(); | |
316 | ||
317 | for (i = 16; i > 0; i--) { | |
318 | outb(EE_ENB | EE_SHIFT_CLK, ee_addr); | |
319 | eeprom_delay(); | |
320 | retval = (retval << 1) | ((inb(ee_addr) & EE_DATA_READ) ? 1 : 0); | |
321 | outb(EE_ENB, ee_addr); | |
322 | eeprom_delay(); | |
323 | } | |
324 | ||
325 | /* Terminate the EEPROM access. */ | |
326 | outb(~EE_CS, ee_addr); | |
327 | eeprom_delay(); | |
328 | return retval; | |
329 | } | |
330 | ||
331 | static const unsigned int rtl8139_rx_config = | |
332 | (RX_BUF_LEN_IDX << 11) | | |
333 | (RX_FIFO_THRESH << 13) | | |
334 | (RX_DMA_BURST << 8); | |
335 | ||
336 | static void set_rx_mode(struct eth_device *dev) { | |
337 | unsigned int mc_filter[2]; | |
338 | int rx_mode; | |
339 | /* !IFF_PROMISC */ | |
340 | rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys; | |
341 | mc_filter[1] = mc_filter[0] = 0xffffffff; | |
342 | ||
343 | outl(rtl8139_rx_config | rx_mode, ioaddr + RxConfig); | |
344 | ||
345 | outl(mc_filter[0], ioaddr + MAR0 + 0); | |
346 | outl(mc_filter[1], ioaddr + MAR0 + 4); | |
347 | } | |
348 | ||
349 | static void rtl_reset(struct eth_device *dev) | |
350 | { | |
351 | int i; | |
352 | ||
353 | outb(CmdReset, ioaddr + ChipCmd); | |
354 | ||
355 | cur_rx = 0; | |
356 | cur_tx = 0; | |
357 | ||
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 */ | |
362 | } | |
363 | ||
364 | ||
365 | for (i = 0; i < ETH_ALEN; i++) | |
366 | outb(dev->enetaddr[i], ioaddr + MAC0 + i); | |
367 | ||
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); | |
373 | ||
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. */ | |
381 | ||
382 | #ifdef DEBUG_RX | |
383 | printf("rx ring address is %X\n",(unsigned long)rx_ring); | |
384 | #endif | |
385 | outl(phys_to_bus((int)rx_ring), ioaddr + RxBuf); | |
386 | ||
387 | /* If we add multicast support, the MAR0 register would have to be | |
388 | * initialized to 0xffffffffffffffff (two 32 bit accesses). Etherboot | |
b6e4c403 | 389 | * only needs broadcast (for ARP/RARP/BOOTP/DHCP) and unicast. */ |
63f34912 WD |
390 | |
391 | outb(CmdRxEnb | CmdTxEnb, ioaddr + ChipCmd); | |
392 | ||
393 | outl(rtl8139_rx_config, ioaddr + RxConfig); | |
394 | ||
395 | /* Start the chip's Tx and Rx process. */ | |
396 | outl(0, ioaddr + RxMissed); | |
397 | ||
398 | /* set_rx_mode */ | |
399 | set_rx_mode(dev); | |
400 | ||
401 | /* Disable all known interrupts by setting the interrupt mask. */ | |
402 | outw(0, ioaddr + IntrMask); | |
403 | } | |
404 | ||
405 | static int rtl_transmit(struct eth_device *dev, volatile void *packet, int length) | |
406 | { | |
407 | unsigned int status, to; | |
408 | unsigned long txstatus; | |
409 | unsigned int len = length; | |
410 | ||
411 | ioaddr = dev->iobase; | |
412 | ||
413 | memcpy((char *)tx_buffer, (char *)packet, (int)length); | |
414 | ||
415 | #ifdef DEBUG_TX | |
416 | printf("sending %d bytes\n", len); | |
417 | #endif | |
418 | ||
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'; | |
423 | } | |
424 | ||
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); | |
428 | ||
429 | to = currticks() + RTL_TIMEOUT; | |
430 | ||
431 | do { | |
432 | status = inw(ioaddr + IntrStatus); | |
433 | /* Only acknlowledge interrupt sources we can properly handle | |
434 | * here - the RxOverflow/RxFIFOOver MUST be handled in the | |
b6e4c403 | 435 | * rtl_poll() function. */ |
63f34912 WD |
436 | outw(status & (TxOK | TxErr | PCIErr), ioaddr + IntrStatus); |
437 | if ((status & (TxOK | TxErr | PCIErr)) != 0) break; | |
438 | } while (currticks() < to); | |
439 | ||
440 | txstatus = inl(ioaddr + TxStatus0 + cur_tx*4); | |
441 | ||
442 | if (status & TxOK) { | |
443 | cur_tx = (cur_tx + 1) % NUM_TX_DESC; | |
444 | #ifdef DEBUG_TX | |
445 | printf("tx done (%d ticks), status %hX txstatus %X\n", | |
446 | to-currticks(), status, txstatus); | |
447 | #endif | |
448 | return length; | |
449 | } else { | |
450 | #ifdef DEBUG_TX | |
451 | printf("tx timeout/error (%d ticks), status %hX txstatus %X\n", | |
452 | currticks()-to, status, txstatus); | |
453 | #endif | |
454 | rtl_reset(dev); | |
455 | ||
456 | return 0; | |
457 | } | |
458 | } | |
459 | ||
460 | static int rtl_poll(struct eth_device *dev) | |
461 | { | |
462 | unsigned int status; | |
463 | unsigned int ring_offs; | |
464 | unsigned int rx_size, rx_status; | |
465 | int length=0; | |
466 | ||
467 | ioaddr = dev->iobase; | |
468 | ||
469 | if (inb(ioaddr + ChipCmd) & RxBufEmpty) { | |
470 | return 0; | |
471 | } | |
472 | ||
473 | status = inw(ioaddr + IntrStatus); | |
474 | /* See below for the rest of the interrupt acknowledges. */ | |
475 | outw(status & ~(RxFIFOOver | RxOverflow | RxOK), ioaddr + IntrStatus); | |
476 | ||
477 | #ifdef DEBUG_RX | |
478 | printf("rtl_poll: int %hX ", status); | |
479 | #endif | |
480 | ||
481 | ring_offs = cur_rx % RX_BUF_LEN; | |
482 | rx_status = *(unsigned int*)KSEG1ADDR((rx_ring + ring_offs)); | |
483 | rx_size = rx_status >> 16; | |
484 | rx_status &= 0xffff; | |
485 | ||
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); | |
b6e4c403 | 489 | rtl_reset(dev); /* this clears all interrupts still pending */ |
63f34912 WD |
490 | return 0; |
491 | } | |
492 | ||
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]; | |
498 | ||
499 | memcpy(rxdata, rx_ring + ring_offs + 4, semi_count); | |
500 | memcpy(&(rxdata[semi_count]), rx_ring, rx_size-4-semi_count); | |
501 | ||
502 | NetReceive(rxdata, length); | |
503 | #ifdef DEBUG_RX | |
504 | printf("rx packet %d+%d bytes", semi_count,rx_size-4-semi_count); | |
505 | #endif | |
506 | } else { | |
507 | NetReceive(rx_ring + ring_offs + 4, length); | |
508 | #ifdef DEBUG_RX | |
509 | printf("rx packet %d bytes", rx_size-4); | |
510 | #endif | |
511 | } | |
512 | ||
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); | |
519 | return length; | |
520 | } | |
521 | ||
522 | static void rtl_disable(struct eth_device *dev) | |
523 | { | |
524 | int i; | |
525 | ||
b6e4c403 WD |
526 | ioaddr = dev->iobase; |
527 | ||
63f34912 WD |
528 | /* reset the chip */ |
529 | outb(CmdReset, ioaddr + ChipCmd); | |
530 | ||
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 */ | |
535 | } | |
536 | } | |
537 | #endif /* CFG_CMD_NET && CONFIG_NET_MULTI && CONFIG_RTL8139 */ |