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Commit | Line | Data |
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702c85b0 NI |
1 | /* |
2 | Ported to U-Boot by Christian Pellegrin <chri@ascensit.com> | |
3 | ||
4 | Based on sources from the Linux kernel (pcnet_cs.c, 8390.h) and | |
5 | eCOS(if_dp83902a.c, if_dp83902a.h). Both of these 2 wonderful world | |
6 | are GPL, so this is, of course, GPL. | |
7 | ||
8 | ========================================================================== | |
9 | ||
10 | dev/if_dp83902a.c | |
11 | ||
12 | Ethernet device driver for NS DP83902a ethernet controller | |
13 | ||
14 | ========================================================================== | |
15 | ####ECOSGPLCOPYRIGHTBEGIN#### | |
16 | ------------------------------------------- | |
17 | This file is part of eCos, the Embedded Configurable Operating System. | |
18 | Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. | |
19 | ||
20 | eCos is free software; you can redistribute it and/or modify it under | |
21 | the terms of the GNU General Public License as published by the Free | |
22 | Software Foundation; either version 2 or (at your option) any later version. | |
23 | ||
24 | eCos is distributed in the hope that it will be useful, but WITHOUT ANY | |
25 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
26 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
27 | for more details. | |
28 | ||
29 | You should have received a copy of the GNU General Public License along | |
30 | with eCos; if not, write to the Free Software Foundation, Inc., | |
31 | 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
32 | ||
33 | As a special exception, if other files instantiate templates or use macros | |
34 | or inline functions from this file, or you compile this file and link it | |
35 | with other works to produce a work based on this file, this file does not | |
36 | by itself cause the resulting work to be covered by the GNU General Public | |
37 | License. However the source code for this file must still be made available | |
38 | in accordance with section (3) of the GNU General Public License. | |
39 | ||
40 | This exception does not invalidate any other reasons why a work based on | |
41 | this file might be covered by the GNU General Public License. | |
42 | ||
43 | Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. | |
44 | at http://sources.redhat.com/ecos/ecos-license/ | |
45 | ------------------------------------------- | |
46 | ####ECOSGPLCOPYRIGHTEND#### | |
47 | ####BSDCOPYRIGHTBEGIN#### | |
48 | ||
49 | ------------------------------------------- | |
50 | ||
51 | Portions of this software may have been derived from OpenBSD or other sources, | |
52 | and are covered by the appropriate copyright disclaimers included herein. | |
53 | ||
54 | ------------------------------------------- | |
55 | ||
56 | ####BSDCOPYRIGHTEND#### | |
57 | ========================================================================== | |
58 | #####DESCRIPTIONBEGIN#### | |
59 | ||
60 | Author(s): gthomas | |
61 | Contributors: gthomas, jskov, rsandifo | |
62 | Date: 2001-06-13 | |
63 | Purpose: | |
64 | Description: | |
65 | ||
66 | FIXME: Will fail if pinged with large packets (1520 bytes) | |
67 | Add promisc config | |
68 | Add SNMP | |
69 | ||
70 | ####DESCRIPTIONEND#### | |
71 | ||
72 | ========================================================================== | |
73 | */ | |
74 | ||
75 | #include <common.h> | |
76 | #include <command.h> | |
77 | #include <net.h> | |
78 | #include <malloc.h> | |
4eaf172e | 79 | #include <linux/compiler.h> |
702c85b0 | 80 | |
702c85b0 NI |
81 | /* forward definition of function used for the uboot interface */ |
82 | void uboot_push_packet_len(int len); | |
83 | void uboot_push_tx_done(int key, int val); | |
84 | ||
85 | /* NE2000 base header file */ | |
86 | #include "ne2000_base.h" | |
87 | ||
88 | #if defined(CONFIG_DRIVER_AX88796L) | |
89 | /* AX88796L support */ | |
90 | #include "ax88796.h" | |
91 | #else | |
92 | /* Basic NE2000 chip support */ | |
93 | #include "ne2000.h" | |
94 | #endif | |
95 | ||
96 | static dp83902a_priv_data_t nic; /* just one instance of the card supported */ | |
97 | ||
d0201692 BK |
98 | /** |
99 | * This function reads the MAC address from the serial EEPROM, | |
100 | * used if PROM read fails. Does nothing for ax88796 chips (sh boards) | |
101 | */ | |
702c85b0 | 102 | static bool |
d0201692 | 103 | dp83902a_init(unsigned char *enetaddr) |
702c85b0 NI |
104 | { |
105 | dp83902a_priv_data_t *dp = &nic; | |
106 | u8* base; | |
107 | #if defined(NE2000_BASIC_INIT) | |
108 | int i; | |
109 | #endif | |
110 | ||
111 | DEBUG_FUNCTION(); | |
112 | ||
113 | base = dp->base; | |
114 | if (!base) | |
115 | return false; /* No device found */ | |
116 | ||
117 | DEBUG_LINE(); | |
118 | ||
119 | #if defined(NE2000_BASIC_INIT) | |
120 | /* AX88796L doesn't need */ | |
121 | /* Prepare ESA */ | |
122 | DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE1); /* Select page 1 */ | |
123 | /* Use the address from the serial EEPROM */ | |
124 | for (i = 0; i < 6; i++) | |
125 | DP_IN(base, DP_P1_PAR0+i, dp->esa[i]); | |
126 | DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE0); /* Select page 0 */ | |
127 | ||
128 | printf("NE2000 - %s ESA: %02x:%02x:%02x:%02x:%02x:%02x\n", | |
129 | "eeprom", | |
130 | dp->esa[0], | |
131 | dp->esa[1], | |
132 | dp->esa[2], | |
133 | dp->esa[3], | |
134 | dp->esa[4], | |
135 | dp->esa[5] ); | |
136 | ||
d0201692 | 137 | memcpy(enetaddr, dp->esa, 6); /* Use MAC from serial EEPROM */ |
702c85b0 NI |
138 | #endif /* NE2000_BASIC_INIT */ |
139 | return true; | |
140 | } | |
141 | ||
142 | static void | |
143 | dp83902a_stop(void) | |
144 | { | |
145 | dp83902a_priv_data_t *dp = &nic; | |
146 | u8 *base = dp->base; | |
147 | ||
148 | DEBUG_FUNCTION(); | |
149 | ||
150 | DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_STOP); /* Brutal */ | |
151 | DP_OUT(base, DP_ISR, 0xFF); /* Clear any pending interrupts */ | |
152 | DP_OUT(base, DP_IMR, 0x00); /* Disable all interrupts */ | |
153 | ||
154 | dp->running = false; | |
155 | } | |
156 | ||
157 | /* | |
158 | * This function is called to "start up" the interface. It may be called | |
159 | * multiple times, even when the hardware is already running. It will be | |
160 | * called whenever something "hardware oriented" changes and should leave | |
161 | * the hardware ready to send/receive packets. | |
162 | */ | |
163 | static void | |
164 | dp83902a_start(u8 * enaddr) | |
165 | { | |
166 | dp83902a_priv_data_t *dp = &nic; | |
167 | u8 *base = dp->base; | |
168 | int i; | |
169 | ||
d0201692 BK |
170 | debug("The MAC is %pM\n", enaddr); |
171 | ||
702c85b0 NI |
172 | DEBUG_FUNCTION(); |
173 | ||
174 | DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_STOP); /* Brutal */ | |
175 | DP_OUT(base, DP_DCR, DP_DCR_INIT); | |
176 | DP_OUT(base, DP_RBCH, 0); /* Remote byte count */ | |
177 | DP_OUT(base, DP_RBCL, 0); | |
178 | DP_OUT(base, DP_RCR, DP_RCR_MON); /* Accept no packets */ | |
179 | DP_OUT(base, DP_TCR, DP_TCR_LOCAL); /* Transmitter [virtually] off */ | |
180 | DP_OUT(base, DP_TPSR, dp->tx_buf1); /* Transmitter start page */ | |
181 | dp->tx1 = dp->tx2 = 0; | |
182 | dp->tx_next = dp->tx_buf1; | |
183 | dp->tx_started = false; | |
184 | dp->running = true; | |
185 | DP_OUT(base, DP_PSTART, dp->rx_buf_start); /* Receive ring start page */ | |
186 | DP_OUT(base, DP_BNDRY, dp->rx_buf_end - 1); /* Receive ring boundary */ | |
187 | DP_OUT(base, DP_PSTOP, dp->rx_buf_end); /* Receive ring end page */ | |
188 | dp->rx_next = dp->rx_buf_start - 1; | |
189 | dp->running = true; | |
190 | DP_OUT(base, DP_ISR, 0xFF); /* Clear any pending interrupts */ | |
191 | DP_OUT(base, DP_IMR, DP_IMR_All); /* Enable all interrupts */ | |
192 | DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE1 | DP_CR_STOP); /* Select page 1 */ | |
193 | DP_OUT(base, DP_P1_CURP, dp->rx_buf_start); /* Current page - next free page for Rx */ | |
194 | dp->running = true; | |
195 | for (i = 0; i < ETHER_ADDR_LEN; i++) { | |
196 | /* FIXME */ | |
197 | /*((vu_short*)( base + ((DP_P1_PAR0 + i) * 2) + | |
198 | * 0x1400)) = enaddr[i];*/ | |
199 | DP_OUT(base, DP_P1_PAR0+i, enaddr[i]); | |
200 | } | |
201 | /* Enable and start device */ | |
202 | DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START); | |
203 | DP_OUT(base, DP_TCR, DP_TCR_NORMAL); /* Normal transmit operations */ | |
204 | DP_OUT(base, DP_RCR, DP_RCR_AB); /* Accept broadcast, no errors, no multicast */ | |
205 | dp->running = true; | |
206 | } | |
207 | ||
208 | /* | |
209 | * This routine is called to start the transmitter. It is split out from the | |
210 | * data handling routine so it may be called either when data becomes first | |
211 | * available or when an Tx interrupt occurs | |
212 | */ | |
213 | ||
214 | static void | |
215 | dp83902a_start_xmit(int start_page, int len) | |
216 | { | |
217 | dp83902a_priv_data_t *dp = (dp83902a_priv_data_t *) &nic; | |
218 | u8 *base = dp->base; | |
219 | ||
220 | DEBUG_FUNCTION(); | |
221 | ||
222 | #if DEBUG & 1 | |
223 | printf("Tx pkt %d len %d\n", start_page, len); | |
224 | if (dp->tx_started) | |
225 | printf("TX already started?!?\n"); | |
226 | #endif | |
227 | ||
228 | DP_OUT(base, DP_ISR, (DP_ISR_TxP | DP_ISR_TxE)); | |
229 | DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START); | |
230 | DP_OUT(base, DP_TBCL, len & 0xFF); | |
231 | DP_OUT(base, DP_TBCH, len >> 8); | |
232 | DP_OUT(base, DP_TPSR, start_page); | |
233 | DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_TXPKT | DP_CR_START); | |
234 | ||
235 | dp->tx_started = true; | |
236 | } | |
237 | ||
238 | /* | |
239 | * This routine is called to send data to the hardware. It is known a-priori | |
240 | * that there is free buffer space (dp->tx_next). | |
241 | */ | |
242 | static void | |
243 | dp83902a_send(u8 *data, int total_len, u32 key) | |
244 | { | |
245 | struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic; | |
246 | u8 *base = dp->base; | |
247 | int len, start_page, pkt_len, i, isr; | |
248 | #if DEBUG & 4 | |
249 | int dx; | |
250 | #endif | |
251 | ||
252 | DEBUG_FUNCTION(); | |
253 | ||
254 | len = pkt_len = total_len; | |
255 | if (pkt_len < IEEE_8023_MIN_FRAME) | |
256 | pkt_len = IEEE_8023_MIN_FRAME; | |
257 | ||
258 | start_page = dp->tx_next; | |
259 | if (dp->tx_next == dp->tx_buf1) { | |
260 | dp->tx1 = start_page; | |
261 | dp->tx1_len = pkt_len; | |
262 | dp->tx1_key = key; | |
263 | dp->tx_next = dp->tx_buf2; | |
264 | } else { | |
265 | dp->tx2 = start_page; | |
266 | dp->tx2_len = pkt_len; | |
267 | dp->tx2_key = key; | |
268 | dp->tx_next = dp->tx_buf1; | |
269 | } | |
270 | ||
271 | #if DEBUG & 5 | |
272 | printf("TX prep page %d len %d\n", start_page, pkt_len); | |
273 | #endif | |
274 | ||
275 | DP_OUT(base, DP_ISR, DP_ISR_RDC); /* Clear end of DMA */ | |
276 | { | |
277 | /* | |
278 | * Dummy read. The manual sez something slightly different, | |
279 | * but the code is extended a bit to do what Hitachi's monitor | |
280 | * does (i.e., also read data). | |
281 | */ | |
282 | ||
4eaf172e | 283 | __maybe_unused u16 tmp; |
702c85b0 NI |
284 | int len = 1; |
285 | ||
286 | DP_OUT(base, DP_RSAL, 0x100 - len); | |
287 | DP_OUT(base, DP_RSAH, (start_page - 1) & 0xff); | |
288 | DP_OUT(base, DP_RBCL, len); | |
289 | DP_OUT(base, DP_RBCH, 0); | |
290 | DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_RDMA | DP_CR_START); | |
291 | DP_IN_DATA(dp->data, tmp); | |
292 | } | |
293 | ||
294 | #ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_TX_DMA | |
295 | /* | |
296 | * Stall for a bit before continuing to work around random data | |
297 | * corruption problems on some platforms. | |
298 | */ | |
299 | CYGACC_CALL_IF_DELAY_US(1); | |
300 | #endif | |
301 | ||
302 | /* Send data to device buffer(s) */ | |
303 | DP_OUT(base, DP_RSAL, 0); | |
304 | DP_OUT(base, DP_RSAH, start_page); | |
305 | DP_OUT(base, DP_RBCL, pkt_len & 0xFF); | |
306 | DP_OUT(base, DP_RBCH, pkt_len >> 8); | |
307 | DP_OUT(base, DP_CR, DP_CR_WDMA | DP_CR_START); | |
308 | ||
309 | /* Put data into buffer */ | |
310 | #if DEBUG & 4 | |
311 | printf(" sg buf %08lx len %08x\n ", (u32)data, len); | |
312 | dx = 0; | |
313 | #endif | |
314 | while (len > 0) { | |
315 | #if DEBUG & 4 | |
316 | printf(" %02x", *data); | |
317 | if (0 == (++dx % 16)) printf("\n "); | |
318 | #endif | |
319 | ||
320 | DP_OUT_DATA(dp->data, *data++); | |
321 | len--; | |
322 | } | |
323 | #if DEBUG & 4 | |
324 | printf("\n"); | |
325 | #endif | |
326 | if (total_len < pkt_len) { | |
327 | #if DEBUG & 4 | |
328 | printf(" + %d bytes of padding\n", pkt_len - total_len); | |
329 | #endif | |
330 | /* Padding to 802.3 length was required */ | |
331 | for (i = total_len; i < pkt_len;) { | |
332 | i++; | |
333 | DP_OUT_DATA(dp->data, 0); | |
334 | } | |
335 | } | |
336 | ||
337 | #ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_TX_DMA | |
338 | /* | |
339 | * After last data write, delay for a bit before accessing the | |
340 | * device again, or we may get random data corruption in the last | |
341 | * datum (on some platforms). | |
342 | */ | |
343 | CYGACC_CALL_IF_DELAY_US(1); | |
344 | #endif | |
345 | ||
346 | /* Wait for DMA to complete */ | |
347 | do { | |
348 | DP_IN(base, DP_ISR, isr); | |
349 | } while ((isr & DP_ISR_RDC) == 0); | |
350 | ||
351 | /* Then disable DMA */ | |
352 | DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START); | |
353 | ||
354 | /* Start transmit if not already going */ | |
355 | if (!dp->tx_started) { | |
356 | if (start_page == dp->tx1) { | |
357 | dp->tx_int = 1; /* Expecting interrupt from BUF1 */ | |
358 | } else { | |
359 | dp->tx_int = 2; /* Expecting interrupt from BUF2 */ | |
360 | } | |
361 | dp83902a_start_xmit(start_page, pkt_len); | |
362 | } | |
363 | } | |
364 | ||
365 | /* | |
366 | * This function is called when a packet has been received. It's job is | |
367 | * to prepare to unload the packet from the hardware. Once the length of | |
368 | * the packet is known, the upper layer of the driver can be told. When | |
369 | * the upper layer is ready to unload the packet, the internal function | |
370 | * 'dp83902a_recv' will be called to actually fetch it from the hardware. | |
371 | */ | |
372 | static void | |
373 | dp83902a_RxEvent(void) | |
374 | { | |
375 | struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic; | |
376 | u8 *base = dp->base; | |
4eaf172e | 377 | __maybe_unused u8 rsr; |
702c85b0 NI |
378 | u8 rcv_hdr[4]; |
379 | int i, len, pkt, cur; | |
380 | ||
381 | DEBUG_FUNCTION(); | |
382 | ||
383 | DP_IN(base, DP_RSR, rsr); | |
384 | while (true) { | |
385 | /* Read incoming packet header */ | |
386 | DP_OUT(base, DP_CR, DP_CR_PAGE1 | DP_CR_NODMA | DP_CR_START); | |
387 | DP_IN(base, DP_P1_CURP, cur); | |
388 | DP_OUT(base, DP_P1_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START); | |
389 | DP_IN(base, DP_BNDRY, pkt); | |
390 | ||
391 | pkt += 1; | |
392 | if (pkt == dp->rx_buf_end) | |
393 | pkt = dp->rx_buf_start; | |
394 | ||
395 | if (pkt == cur) { | |
396 | break; | |
397 | } | |
398 | DP_OUT(base, DP_RBCL, sizeof(rcv_hdr)); | |
399 | DP_OUT(base, DP_RBCH, 0); | |
400 | DP_OUT(base, DP_RSAL, 0); | |
401 | DP_OUT(base, DP_RSAH, pkt); | |
402 | if (dp->rx_next == pkt) { | |
403 | if (cur == dp->rx_buf_start) | |
404 | DP_OUT(base, DP_BNDRY, dp->rx_buf_end - 1); | |
405 | else | |
406 | DP_OUT(base, DP_BNDRY, cur - 1); /* Update pointer */ | |
407 | return; | |
408 | } | |
409 | dp->rx_next = pkt; | |
410 | DP_OUT(base, DP_ISR, DP_ISR_RDC); /* Clear end of DMA */ | |
411 | DP_OUT(base, DP_CR, DP_CR_RDMA | DP_CR_START); | |
412 | #ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_RX_DMA | |
413 | CYGACC_CALL_IF_DELAY_US(10); | |
414 | #endif | |
415 | ||
416 | /* read header (get data size)*/ | |
417 | for (i = 0; i < sizeof(rcv_hdr);) { | |
418 | DP_IN_DATA(dp->data, rcv_hdr[i++]); | |
419 | } | |
420 | ||
421 | #if DEBUG & 5 | |
422 | printf("rx hdr %02x %02x %02x %02x\n", | |
423 | rcv_hdr[0], rcv_hdr[1], rcv_hdr[2], rcv_hdr[3]); | |
424 | #endif | |
425 | len = ((rcv_hdr[3] << 8) | rcv_hdr[2]) - sizeof(rcv_hdr); | |
426 | ||
427 | /* data read */ | |
428 | uboot_push_packet_len(len); | |
429 | ||
430 | if (rcv_hdr[1] == dp->rx_buf_start) | |
431 | DP_OUT(base, DP_BNDRY, dp->rx_buf_end - 1); | |
432 | else | |
433 | DP_OUT(base, DP_BNDRY, rcv_hdr[1] - 1); /* Update pointer */ | |
434 | } | |
435 | } | |
436 | ||
437 | /* | |
438 | * This function is called as a result of the "eth_drv_recv()" call above. | |
439 | * It's job is to actually fetch data for a packet from the hardware once | |
440 | * memory buffers have been allocated for the packet. Note that the buffers | |
441 | * may come in pieces, using a scatter-gather list. This allows for more | |
442 | * efficient processing in the upper layers of the stack. | |
443 | */ | |
444 | static void | |
445 | dp83902a_recv(u8 *data, int len) | |
446 | { | |
447 | struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic; | |
448 | u8 *base = dp->base; | |
449 | int i, mlen; | |
450 | u8 saved_char = 0; | |
451 | bool saved; | |
452 | #if DEBUG & 4 | |
453 | int dx; | |
454 | #endif | |
455 | ||
456 | DEBUG_FUNCTION(); | |
457 | ||
458 | #if DEBUG & 5 | |
459 | printf("Rx packet %d length %d\n", dp->rx_next, len); | |
460 | #endif | |
461 | ||
462 | /* Read incoming packet data */ | |
463 | DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START); | |
464 | DP_OUT(base, DP_RBCL, len & 0xFF); | |
465 | DP_OUT(base, DP_RBCH, len >> 8); | |
466 | DP_OUT(base, DP_RSAL, 4); /* Past header */ | |
467 | DP_OUT(base, DP_RSAH, dp->rx_next); | |
468 | DP_OUT(base, DP_ISR, DP_ISR_RDC); /* Clear end of DMA */ | |
469 | DP_OUT(base, DP_CR, DP_CR_RDMA | DP_CR_START); | |
470 | #ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_RX_DMA | |
471 | CYGACC_CALL_IF_DELAY_US(10); | |
472 | #endif | |
473 | ||
474 | saved = false; | |
475 | for (i = 0; i < 1; i++) { | |
476 | if (data) { | |
477 | mlen = len; | |
478 | #if DEBUG & 4 | |
479 | printf(" sg buf %08lx len %08x \n", (u32) data, mlen); | |
480 | dx = 0; | |
481 | #endif | |
482 | while (0 < mlen) { | |
483 | /* Saved byte from previous loop? */ | |
484 | if (saved) { | |
485 | *data++ = saved_char; | |
486 | mlen--; | |
487 | saved = false; | |
488 | continue; | |
489 | } | |
490 | ||
491 | { | |
492 | u8 tmp; | |
493 | DP_IN_DATA(dp->data, tmp); | |
494 | #if DEBUG & 4 | |
495 | printf(" %02x", tmp); | |
496 | if (0 == (++dx % 16)) printf("\n "); | |
497 | #endif | |
51855e89 | 498 | *data++ = tmp; |
702c85b0 NI |
499 | mlen--; |
500 | } | |
501 | } | |
502 | #if DEBUG & 4 | |
503 | printf("\n"); | |
504 | #endif | |
505 | } | |
506 | } | |
507 | } | |
508 | ||
509 | static void | |
510 | dp83902a_TxEvent(void) | |
511 | { | |
512 | struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic; | |
513 | u8 *base = dp->base; | |
4eaf172e | 514 | __maybe_unused u8 tsr; |
702c85b0 NI |
515 | u32 key; |
516 | ||
517 | DEBUG_FUNCTION(); | |
518 | ||
519 | DP_IN(base, DP_TSR, tsr); | |
520 | if (dp->tx_int == 1) { | |
521 | key = dp->tx1_key; | |
522 | dp->tx1 = 0; | |
523 | } else { | |
524 | key = dp->tx2_key; | |
525 | dp->tx2 = 0; | |
526 | } | |
527 | /* Start next packet if one is ready */ | |
528 | dp->tx_started = false; | |
529 | if (dp->tx1) { | |
530 | dp83902a_start_xmit(dp->tx1, dp->tx1_len); | |
531 | dp->tx_int = 1; | |
532 | } else if (dp->tx2) { | |
533 | dp83902a_start_xmit(dp->tx2, dp->tx2_len); | |
534 | dp->tx_int = 2; | |
535 | } else { | |
536 | dp->tx_int = 0; | |
537 | } | |
538 | /* Tell higher level we sent this packet */ | |
539 | uboot_push_tx_done(key, 0); | |
540 | } | |
541 | ||
542 | /* | |
543 | * Read the tally counters to clear them. Called in response to a CNT | |
544 | * interrupt. | |
545 | */ | |
546 | static void | |
547 | dp83902a_ClearCounters(void) | |
548 | { | |
549 | struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic; | |
550 | u8 *base = dp->base; | |
4eaf172e | 551 | __maybe_unused u8 cnt1, cnt2, cnt3; |
702c85b0 NI |
552 | |
553 | DP_IN(base, DP_FER, cnt1); | |
554 | DP_IN(base, DP_CER, cnt2); | |
555 | DP_IN(base, DP_MISSED, cnt3); | |
556 | DP_OUT(base, DP_ISR, DP_ISR_CNT); | |
557 | } | |
558 | ||
559 | /* | |
560 | * Deal with an overflow condition. This code follows the procedure set | |
561 | * out in section 7.0 of the datasheet. | |
562 | */ | |
563 | static void | |
564 | dp83902a_Overflow(void) | |
565 | { | |
566 | struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *)&nic; | |
567 | u8 *base = dp->base; | |
568 | u8 isr; | |
569 | ||
570 | /* Issue a stop command and wait 1.6ms for it to complete. */ | |
571 | DP_OUT(base, DP_CR, DP_CR_STOP | DP_CR_NODMA); | |
572 | CYGACC_CALL_IF_DELAY_US(1600); | |
573 | ||
574 | /* Clear the remote byte counter registers. */ | |
575 | DP_OUT(base, DP_RBCL, 0); | |
576 | DP_OUT(base, DP_RBCH, 0); | |
577 | ||
578 | /* Enter loopback mode while we clear the buffer. */ | |
579 | DP_OUT(base, DP_TCR, DP_TCR_LOCAL); | |
580 | DP_OUT(base, DP_CR, DP_CR_START | DP_CR_NODMA); | |
581 | ||
582 | /* | |
583 | * Read in as many packets as we can and acknowledge any and receive | |
584 | * interrupts. Since the buffer has overflowed, a receive event of | |
eae4b2b6 | 585 | * some kind will have occurred. |
702c85b0 NI |
586 | */ |
587 | dp83902a_RxEvent(); | |
588 | DP_OUT(base, DP_ISR, DP_ISR_RxP|DP_ISR_RxE); | |
589 | ||
590 | /* Clear the overflow condition and leave loopback mode. */ | |
591 | DP_OUT(base, DP_ISR, DP_ISR_OFLW); | |
592 | DP_OUT(base, DP_TCR, DP_TCR_NORMAL); | |
593 | ||
594 | /* | |
eae4b2b6 | 595 | * If a transmit command was issued, but no transmit event has occurred, |
702c85b0 NI |
596 | * restart it here. |
597 | */ | |
598 | DP_IN(base, DP_ISR, isr); | |
599 | if (dp->tx_started && !(isr & (DP_ISR_TxP|DP_ISR_TxE))) { | |
600 | DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_TXPKT | DP_CR_START); | |
601 | } | |
602 | } | |
603 | ||
604 | static void | |
605 | dp83902a_poll(void) | |
606 | { | |
607 | struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic; | |
608 | u8 *base = dp->base; | |
609 | u8 isr; | |
610 | ||
611 | DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE0 | DP_CR_START); | |
612 | DP_IN(base, DP_ISR, isr); | |
613 | while (0 != isr) { | |
614 | /* | |
615 | * The CNT interrupt triggers when the MSB of one of the error | |
616 | * counters is set. We don't much care about these counters, but | |
617 | * we should read their values to reset them. | |
618 | */ | |
619 | if (isr & DP_ISR_CNT) { | |
620 | dp83902a_ClearCounters(); | |
621 | } | |
622 | /* | |
623 | * Check for overflow. It's a special case, since there's a | |
624 | * particular procedure that must be followed to get back into | |
625 | * a running state.a | |
626 | */ | |
627 | if (isr & DP_ISR_OFLW) { | |
628 | dp83902a_Overflow(); | |
629 | } else { | |
630 | /* | |
631 | * Other kinds of interrupts can be acknowledged simply by | |
632 | * clearing the relevant bits of the ISR. Do that now, then | |
633 | * handle the interrupts we care about. | |
634 | */ | |
635 | DP_OUT(base, DP_ISR, isr); /* Clear set bits */ | |
636 | if (!dp->running) break; /* Is this necessary? */ | |
637 | /* | |
638 | * Check for tx_started on TX event since these may happen | |
639 | * spuriously it seems. | |
640 | */ | |
641 | if (isr & (DP_ISR_TxP|DP_ISR_TxE) && dp->tx_started) { | |
642 | dp83902a_TxEvent(); | |
643 | } | |
644 | if (isr & (DP_ISR_RxP|DP_ISR_RxE)) { | |
645 | dp83902a_RxEvent(); | |
646 | } | |
647 | } | |
648 | DP_IN(base, DP_ISR, isr); | |
649 | } | |
650 | } | |
651 | ||
652 | ||
a187559e | 653 | /* U-Boot specific routines */ |
702c85b0 NI |
654 | static u8 *pbuf = NULL; |
655 | ||
656 | static int pkey = -1; | |
657 | static int initialized = 0; | |
658 | ||
659 | void uboot_push_packet_len(int len) { | |
660 | PRINTK("pushed len = %d\n", len); | |
661 | if (len >= 2000) { | |
662 | printf("NE2000: packet too big\n"); | |
663 | return; | |
664 | } | |
665 | dp83902a_recv(&pbuf[0], len); | |
666 | ||
667 | /*Just pass it to the upper layer*/ | |
1fd92db8 | 668 | net_process_received_packet(&pbuf[0], len); |
702c85b0 NI |
669 | } |
670 | ||
671 | void uboot_push_tx_done(int key, int val) { | |
672 | PRINTK("pushed key = %d\n", key); | |
673 | pkey = key; | |
674 | } | |
675 | ||
d0201692 BK |
676 | /** |
677 | * Setup the driver and init MAC address according to doc/README.enetaddr | |
678 | * Called by ne2k_register() before registering the driver @eth layer | |
679 | * | |
680 | * @param struct ethdevice of this instance of the driver for dev->enetaddr | |
681 | * @return 0 on success, -1 on error (causing caller to print error msg) | |
682 | */ | |
683 | static int ne2k_setup_driver(struct eth_device *dev) | |
684 | { | |
685 | PRINTK("### ne2k_setup_driver\n"); | |
702c85b0 NI |
686 | |
687 | if (!pbuf) { | |
688 | pbuf = malloc(2000); | |
689 | if (!pbuf) { | |
690 | printf("Cannot allocate rx buffer\n"); | |
691 | return -1; | |
692 | } | |
693 | } | |
694 | ||
695 | #ifdef CONFIG_DRIVER_NE2000_CCR | |
696 | { | |
697 | vu_char *p = (vu_char *) CONFIG_DRIVER_NE2000_CCR; | |
698 | ||
699 | PRINTK("CCR before is %x\n", *p); | |
700 | *p = CONFIG_DRIVER_NE2000_VAL; | |
701 | PRINTK("CCR after is %x\n", *p); | |
702 | } | |
703 | #endif | |
704 | ||
705 | nic.base = (u8 *) CONFIG_DRIVER_NE2000_BASE; | |
706 | ||
702c85b0 NI |
707 | nic.data = nic.base + DP_DATA; |
708 | nic.tx_buf1 = START_PG; | |
709 | nic.tx_buf2 = START_PG2; | |
710 | nic.rx_buf_start = RX_START; | |
711 | nic.rx_buf_end = RX_END; | |
712 | ||
d0201692 BK |
713 | /* |
714 | * According to doc/README.enetaddr, drivers shall give priority | |
715 | * to the MAC address value in the environment, so we do not read | |
716 | * it from the prom or eeprom if it is specified in the environment. | |
717 | */ | |
35affd7a | 718 | if (!eth_env_get_enetaddr("ethaddr", dev->enetaddr)) { |
d0201692 BK |
719 | /* If the MAC address is not in the environment, get it: */ |
720 | if (!get_prom(dev->enetaddr, nic.base)) /* get MAC from prom */ | |
721 | dp83902a_init(dev->enetaddr); /* fallback: seeprom */ | |
722 | /* And write it into the environment otherwise eth_write_hwaddr | |
35affd7a | 723 | * returns -1 due to eth_env_get_enetaddr_by_index() failing, |
d0201692 BK |
724 | * and this causes "Warning: failed to set MAC address", and |
725 | * cmd_bdinfo has no ethaddr value which it can show: */ | |
fd1e959e | 726 | eth_env_set_enetaddr("ethaddr", dev->enetaddr); |
d0201692 BK |
727 | } |
728 | return 0; | |
729 | } | |
702c85b0 | 730 | |
d0201692 BK |
731 | static int ne2k_init(struct eth_device *dev, bd_t *bd) |
732 | { | |
733 | dp83902a_start(dev->enetaddr); | |
702c85b0 | 734 | initialized = 1; |
702c85b0 NI |
735 | return 0; |
736 | } | |
737 | ||
d0201692 BK |
738 | static void ne2k_halt(struct eth_device *dev) |
739 | { | |
740 | debug("### ne2k_halt\n"); | |
702c85b0 NI |
741 | if(initialized) |
742 | dp83902a_stop(); | |
743 | initialized = 0; | |
744 | } | |
745 | ||
d0201692 BK |
746 | static int ne2k_recv(struct eth_device *dev) |
747 | { | |
702c85b0 NI |
748 | dp83902a_poll(); |
749 | return 1; | |
750 | } | |
751 | ||
10cbe3b6 | 752 | static int ne2k_send(struct eth_device *dev, void *packet, int length) |
d0201692 | 753 | { |
702c85b0 NI |
754 | int tmo; |
755 | ||
d0201692 | 756 | debug("### ne2k_send\n"); |
702c85b0 NI |
757 | |
758 | pkey = -1; | |
759 | ||
760 | dp83902a_send((u8 *) packet, length, 666); | |
6d0f6bcf | 761 | tmo = get_timer (0) + TOUT * CONFIG_SYS_HZ; |
702c85b0 NI |
762 | while(1) { |
763 | dp83902a_poll(); | |
764 | if (pkey != -1) { | |
765 | PRINTK("Packet sucesfully sent\n"); | |
766 | return 0; | |
767 | } | |
768 | if (get_timer (0) >= tmo) { | |
769 | printf("transmission error (timoeut)\n"); | |
770 | return 0; | |
771 | } | |
772 | ||
773 | } | |
774 | return 0; | |
775 | } | |
d0201692 BK |
776 | |
777 | /** | |
778 | * Setup the driver for use and register it with the eth layer | |
779 | * @return 0 on success, -1 on error (causing caller to print error msg) | |
780 | */ | |
781 | int ne2k_register(void) | |
782 | { | |
783 | struct eth_device *dev; | |
784 | ||
785 | dev = calloc(sizeof(*dev), 1); | |
786 | if (dev == NULL) | |
787 | return -1; | |
788 | ||
789 | if (ne2k_setup_driver(dev)) | |
790 | return -1; | |
791 | ||
792 | dev->init = ne2k_init; | |
793 | dev->halt = ne2k_halt; | |
794 | dev->send = ne2k_send; | |
795 | dev->recv = ne2k_recv; | |
796 | ||
192bc694 | 797 | strcpy(dev->name, "NE2000"); |
d0201692 BK |
798 | |
799 | return eth_register(dev); | |
800 | } |