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1/* cs89x0.c: A Crystal Semiconductor (Now Cirrus Logic) CS89[02]0
2 * driver for linux.
3 * Written 1996 by Russell Nelson, with reference to skeleton.c
4 * written 1993-1994 by Donald Becker.
5 *
6 * This software may be used and distributed according to the terms
7 * of the GNU General Public License, incorporated herein by reference.
8 *
9 * The author may be reached at nelson@crynwr.com, Crynwr
10 * Software, 521 Pleasant Valley Rd., Potsdam, NY 13676
11 *
12 * Other contributors:
13 * Mike Cruse : mcruse@cti-ltd.com
14 * Russ Nelson
15 * Melody Lee : ethernet@crystal.cirrus.com
16 * Alan Cox
17 * Andrew Morton
18 * Oskar Schirmer : oskar@scara.com
19 * Deepak Saxena : dsaxena@plexity.net
20 * Dmitry Pervushin : dpervushin@ru.mvista.com
21 * Deepak Saxena : dsaxena@plexity.net
22 * Domenico Andreoli : cavokz@gmail.com
23 */
24
25
26/*
27 * Set this to zero to disable DMA code
28 *
29 * Note that even if DMA is turned off we still support the 'dma' and 'use_dma'
30 * module options so we don't break any startup scripts.
31 */
32#ifndef CONFIG_ISA_DMA_API
33#define ALLOW_DMA 0
34#else
35#define ALLOW_DMA 1
36#endif
37
38/*
39 * Set this to zero to remove all the debug statements via
40 * dead code elimination
41 */
42#define DEBUGGING 1
43
44/* Sources:
45 * Crynwr packet driver epktisa.
46 * Crystal Semiconductor data sheets.
47 */
48
49#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
50
51#include <linux/module.h>
52#include <linux/printk.h>
53#include <linux/errno.h>
54#include <linux/netdevice.h>
55#include <linux/etherdevice.h>
56#include <linux/of.h>
57#include <linux/platform_device.h>
58#include <linux/kernel.h>
59#include <linux/types.h>
60#include <linux/fcntl.h>
61#include <linux/interrupt.h>
62#include <linux/ioport.h>
63#include <linux/in.h>
64#include <linux/jiffies.h>
65#include <linux/skbuff.h>
66#include <linux/spinlock.h>
67#include <linux/string.h>
68#include <linux/init.h>
69#include <linux/bitops.h>
70#include <linux/delay.h>
71#include <linux/gfp.h>
72#include <linux/io.h>
73
74#include <net/Space.h>
75
76#include <asm/irq.h>
77#include <linux/atomic.h>
78#if ALLOW_DMA
79#include <asm/dma.h>
80#endif
81
82#include "cs89x0.h"
83
84#define cs89_dbg(val, level, fmt, ...) \
85do { \
86 if (val <= net_debug) \
87 pr_##level(fmt, ##__VA_ARGS__); \
88} while (0)
89
90static char version[] __initdata =
91 "v2.4.3-pre1 Russell Nelson <nelson@crynwr.com>, Andrew Morton";
92
93#define DRV_NAME "cs89x0"
94
95/* First, a few definitions that the brave might change.
96 * A zero-terminated list of I/O addresses to be probed. Some special flags..
97 * Addr & 1 = Read back the address port, look for signature and reset
98 * the page window before probing
99 * Addr & 3 = Reset the page window and probe
100 * The CLPS eval board has the Cirrus chip at 0x80090300, in ARM IO space,
101 * but it is possible that a Cirrus board could be plugged into the ISA
102 * slots.
103 */
104/* The cs8900 has 4 IRQ pins, software selectable. cs8900_irq_map maps
105 * them to system IRQ numbers. This mapping is card specific and is set to
106 * the configuration of the Cirrus Eval board for this chip.
107 */
108#if IS_ENABLED(CONFIG_CS89x0_ISA)
109static unsigned int netcard_portlist[] __used __initdata = {
110 0x300, 0x320, 0x340, 0x360, 0x200, 0x220, 0x240,
111 0x260, 0x280, 0x2a0, 0x2c0, 0x2e0, 0
112};
113static unsigned int cs8900_irq_map[] = {
114 10, 11, 12, 5
115};
116#endif
117
118#if DEBUGGING
119static unsigned int net_debug = DEBUGGING;
120#else
121#define net_debug 0 /* gcc will remove all the debug code for us */
122#endif
123
124/* The number of low I/O ports used by the ethercard. */
125#define NETCARD_IO_EXTENT 16
126
127/* we allow the user to override various values normally set in the EEPROM */
128#define FORCE_RJ45 0x0001 /* pick one of these three */
129#define FORCE_AUI 0x0002
130#define FORCE_BNC 0x0004
131
132#define FORCE_AUTO 0x0010 /* pick one of these three */
133#define FORCE_HALF 0x0020
134#define FORCE_FULL 0x0030
135
136/* Information that need to be kept for each board. */
137struct net_local {
138 int chip_type; /* one of: CS8900, CS8920, CS8920M */
139 char chip_revision; /* revision letter of the chip ('A'...) */
140 int send_cmd; /* the proper send command: TX_NOW, TX_AFTER_381, or TX_AFTER_ALL */
141 int auto_neg_cnf; /* auto-negotiation word from EEPROM */
142 int adapter_cnf; /* adapter configuration from EEPROM */
143 int isa_config; /* ISA configuration from EEPROM */
144 int irq_map; /* IRQ map from EEPROM */
145 int rx_mode; /* what mode are we in? 0, RX_MULTCAST_ACCEPT, or RX_ALL_ACCEPT */
146 int curr_rx_cfg; /* a copy of PP_RxCFG */
147 int linectl; /* either 0 or LOW_RX_SQUELCH, depending on configuration. */
148 int send_underrun; /* keep track of how many underruns in a row we get */
149 int force; /* force various values; see FORCE* above. */
150 spinlock_t lock;
151 void __iomem *virt_addr;/* CS89x0 virtual address. */
152#if ALLOW_DMA
153 int use_dma; /* Flag: we're using dma */
154 int dma; /* DMA channel */
155 int dmasize; /* 16 or 64 */
156 unsigned char *dma_buff; /* points to the beginning of the buffer */
157 unsigned char *end_dma_buff; /* points to the end of the buffer */
158 unsigned char *rx_dma_ptr; /* points to the next packet */
159#endif
160};
161
162/* Example routines you must write ;->. */
163#define tx_done(dev) 1
164
165/*
166 * Permit 'cs89x0_dma=N' in the kernel boot environment
167 */
168#if !defined(MODULE)
169#if ALLOW_DMA
170static int g_cs89x0_dma;
171
172static int __init dma_fn(char *str)
173{
174 g_cs89x0_dma = simple_strtol(str, NULL, 0);
175 return 1;
176}
177
178__setup("cs89x0_dma=", dma_fn);
179#endif /* ALLOW_DMA */
180
181static int g_cs89x0_media__force;
182
183static int __init media_fn(char *str)
184{
185 if (!strcmp(str, "rj45"))
186 g_cs89x0_media__force = FORCE_RJ45;
187 else if (!strcmp(str, "aui"))
188 g_cs89x0_media__force = FORCE_AUI;
189 else if (!strcmp(str, "bnc"))
190 g_cs89x0_media__force = FORCE_BNC;
191
192 return 1;
193}
194
195__setup("cs89x0_media=", media_fn);
196#endif
197
198static void readwords(struct net_local *lp, int portno, void *buf, int length)
199{
200 u8 *buf8 = (u8 *)buf;
201
202 do {
203 u16 tmp16;
204
205 tmp16 = ioread16(lp->virt_addr + portno);
206 *buf8++ = (u8)tmp16;
207 *buf8++ = (u8)(tmp16 >> 8);
208 } while (--length);
209}
210
211static void writewords(struct net_local *lp, int portno, void *buf, int length)
212{
213 u8 *buf8 = (u8 *)buf;
214
215 do {
216 u16 tmp16;
217
218 tmp16 = *buf8++;
219 tmp16 |= (*buf8++) << 8;
220 iowrite16(tmp16, lp->virt_addr + portno);
221 } while (--length);
222}
223
224static u16
225readreg(struct net_device *dev, u16 regno)
226{
227 struct net_local *lp = netdev_priv(dev);
228
229 iowrite16(regno, lp->virt_addr + ADD_PORT);
230 return ioread16(lp->virt_addr + DATA_PORT);
231}
232
233static void
234writereg(struct net_device *dev, u16 regno, u16 value)
235{
236 struct net_local *lp = netdev_priv(dev);
237
238 iowrite16(regno, lp->virt_addr + ADD_PORT);
239 iowrite16(value, lp->virt_addr + DATA_PORT);
240}
241
242static int __init
243wait_eeprom_ready(struct net_device *dev)
244{
245 unsigned long timeout = jiffies;
246 /* check to see if the EEPROM is ready,
247 * a timeout is used just in case EEPROM is ready when
248 * SI_BUSY in the PP_SelfST is clear
249 */
250 while (readreg(dev, PP_SelfST) & SI_BUSY)
251 if (time_after_eq(jiffies, timeout + 40))
252 return -1;
253 return 0;
254}
255
256static int __init
257get_eeprom_data(struct net_device *dev, int off, int len, int *buffer)
258{
259 int i;
260
261 cs89_dbg(3, info, "EEPROM data from %x for %x:", off, len);
262 for (i = 0; i < len; i++) {
263 if (wait_eeprom_ready(dev) < 0)
264 return -1;
265 /* Now send the EEPROM read command and EEPROM location to read */
266 writereg(dev, PP_EECMD, (off + i) | EEPROM_READ_CMD);
267 if (wait_eeprom_ready(dev) < 0)
268 return -1;
269 buffer[i] = readreg(dev, PP_EEData);
270 cs89_dbg(3, cont, " %04x", buffer[i]);
271 }
272 cs89_dbg(3, cont, "\n");
273 return 0;
274}
275
276static int __init
277get_eeprom_cksum(int off, int len, int *buffer)
278{
279 int i, cksum;
280
281 cksum = 0;
282 for (i = 0; i < len; i++)
283 cksum += buffer[i];
284 cksum &= 0xffff;
285 if (cksum == 0)
286 return 0;
287 return -1;
288}
289
290static void
291write_irq(struct net_device *dev, int chip_type, int irq)
292{
293 int i;
294
295 if (chip_type == CS8900) {
296#if IS_ENABLED(CONFIG_CS89x0_ISA)
297 /* Search the mapping table for the corresponding IRQ pin. */
298 for (i = 0; i != ARRAY_SIZE(cs8900_irq_map); i++)
299 if (cs8900_irq_map[i] == irq)
300 break;
301 /* Not found */
302 if (i == ARRAY_SIZE(cs8900_irq_map))
303 i = 3;
304#else
305 /* INTRQ0 pin is used for interrupt generation. */
306 i = 0;
307#endif
308 writereg(dev, PP_CS8900_ISAINT, i);
309 } else {
310 writereg(dev, PP_CS8920_ISAINT, irq);
311 }
312}
313
314static void
315count_rx_errors(int status, struct net_device *dev)
316{
317 dev->stats.rx_errors++;
318 if (status & RX_RUNT)
319 dev->stats.rx_length_errors++;
320 if (status & RX_EXTRA_DATA)
321 dev->stats.rx_length_errors++;
322 if ((status & RX_CRC_ERROR) && !(status & (RX_EXTRA_DATA | RX_RUNT)))
323 /* per str 172 */
324 dev->stats.rx_crc_errors++;
325 if (status & RX_DRIBBLE)
326 dev->stats.rx_frame_errors++;
327}
328
329/*********************************
330 * This page contains DMA routines
331 *********************************/
332
333#if ALLOW_DMA
334
335#define dma_page_eq(ptr1, ptr2) ((long)(ptr1) >> 17 == (long)(ptr2) >> 17)
336
337static void
338get_dma_channel(struct net_device *dev)
339{
340 struct net_local *lp = netdev_priv(dev);
341
342 if (lp->dma) {
343 dev->dma = lp->dma;
344 lp->isa_config |= ISA_RxDMA;
345 } else {
346 if ((lp->isa_config & ANY_ISA_DMA) == 0)
347 return;
348 dev->dma = lp->isa_config & DMA_NO_MASK;
349 if (lp->chip_type == CS8900)
350 dev->dma += 5;
351 if (dev->dma < 5 || dev->dma > 7) {
352 lp->isa_config &= ~ANY_ISA_DMA;
353 return;
354 }
355 }
356}
357
358static void
359write_dma(struct net_device *dev, int chip_type, int dma)
360{
361 struct net_local *lp = netdev_priv(dev);
362 if ((lp->isa_config & ANY_ISA_DMA) == 0)
363 return;
364 if (chip_type == CS8900)
365 writereg(dev, PP_CS8900_ISADMA, dma - 5);
366 else
367 writereg(dev, PP_CS8920_ISADMA, dma);
368}
369
370static void
371set_dma_cfg(struct net_device *dev)
372{
373 struct net_local *lp = netdev_priv(dev);
374
375 if (lp->use_dma) {
376 if ((lp->isa_config & ANY_ISA_DMA) == 0) {
377 cs89_dbg(3, err, "set_dma_cfg(): no DMA\n");
378 return;
379 }
380 if (lp->isa_config & ISA_RxDMA) {
381 lp->curr_rx_cfg |= RX_DMA_ONLY;
382 cs89_dbg(3, info, "set_dma_cfg(): RX_DMA_ONLY\n");
383 } else {
384 lp->curr_rx_cfg |= AUTO_RX_DMA; /* not that we support it... */
385 cs89_dbg(3, info, "set_dma_cfg(): AUTO_RX_DMA\n");
386 }
387 }
388}
389
390static int
391dma_bufcfg(struct net_device *dev)
392{
393 struct net_local *lp = netdev_priv(dev);
394 if (lp->use_dma)
395 return (lp->isa_config & ANY_ISA_DMA) ? RX_DMA_ENBL : 0;
396 else
397 return 0;
398}
399
400static int
401dma_busctl(struct net_device *dev)
402{
403 int retval = 0;
404 struct net_local *lp = netdev_priv(dev);
405 if (lp->use_dma) {
406 if (lp->isa_config & ANY_ISA_DMA)
407 retval |= RESET_RX_DMA; /* Reset the DMA pointer */
408 if (lp->isa_config & DMA_BURST)
409 retval |= DMA_BURST_MODE; /* Does ISA config specify DMA burst ? */
410 if (lp->dmasize == 64)
411 retval |= RX_DMA_SIZE_64K; /* did they ask for 64K? */
412 retval |= MEMORY_ON; /* we need memory enabled to use DMA. */
413 }
414 return retval;
415}
416
417static void
418dma_rx(struct net_device *dev)
419{
420 struct net_local *lp = netdev_priv(dev);
421 struct sk_buff *skb;
422 int status, length;
423 unsigned char *bp = lp->rx_dma_ptr;
424
425 status = bp[0] + (bp[1] << 8);
426 length = bp[2] + (bp[3] << 8);
427 bp += 4;
428
429 cs89_dbg(5, debug, "%s: receiving DMA packet at %lx, status %x, length %x\n",
430 dev->name, (unsigned long)bp, status, length);
431
432 if ((status & RX_OK) == 0) {
433 count_rx_errors(status, dev);
434 goto skip_this_frame;
435 }
436
437 /* Malloc up new buffer. */
438 skb = netdev_alloc_skb(dev, length + 2);
439 if (skb == NULL) {
440 dev->stats.rx_dropped++;
441
442 /* AKPM: advance bp to the next frame */
443skip_this_frame:
444 bp += (length + 3) & ~3;
445 if (bp >= lp->end_dma_buff)
446 bp -= lp->dmasize * 1024;
447 lp->rx_dma_ptr = bp;
448 return;
449 }
450 skb_reserve(skb, 2); /* longword align L3 header */
451
452 if (bp + length > lp->end_dma_buff) {
453 int semi_cnt = lp->end_dma_buff - bp;
454 skb_put_data(skb, bp, semi_cnt);
455 skb_put_data(skb, lp->dma_buff, length - semi_cnt);
456 } else {
457 skb_put_data(skb, bp, length);
458 }
459 bp += (length + 3) & ~3;
460 if (bp >= lp->end_dma_buff)
461 bp -= lp->dmasize*1024;
462 lp->rx_dma_ptr = bp;
463
464 cs89_dbg(3, info, "%s: received %d byte DMA packet of type %x\n",
465 dev->name, length,
466 ((skb->data[ETH_ALEN + ETH_ALEN] << 8) |
467 skb->data[ETH_ALEN + ETH_ALEN + 1]));
468
469 skb->protocol = eth_type_trans(skb, dev);
470 netif_rx(skb);
471 dev->stats.rx_packets++;
472 dev->stats.rx_bytes += length;
473}
474
475static void release_dma_buff(struct net_local *lp)
476{
477 if (lp->dma_buff) {
478 free_pages((unsigned long)(lp->dma_buff),
479 get_order(lp->dmasize * 1024));
480 lp->dma_buff = NULL;
481 }
482}
483
484#endif /* ALLOW_DMA */
485
486static void
487control_dc_dc(struct net_device *dev, int on_not_off)
488{
489 struct net_local *lp = netdev_priv(dev);
490 unsigned int selfcontrol;
491 unsigned long timenow = jiffies;
492 /* control the DC to DC convertor in the SelfControl register.
493 * Note: This is hooked up to a general purpose pin, might not
494 * always be a DC to DC convertor.
495 */
496
497 selfcontrol = HCB1_ENBL; /* Enable the HCB1 bit as an output */
498 if (((lp->adapter_cnf & A_CNF_DC_DC_POLARITY) != 0) ^ on_not_off)
499 selfcontrol |= HCB1;
500 else
501 selfcontrol &= ~HCB1;
502 writereg(dev, PP_SelfCTL, selfcontrol);
503
504 /* Wait for the DC/DC converter to power up - 500ms */
505 while (time_before(jiffies, timenow + HZ))
506 ;
507}
508
509/* send a test packet - return true if carrier bits are ok */
510static int
511send_test_pkt(struct net_device *dev)
512{
513 struct net_local *lp = netdev_priv(dev);
514 char test_packet[] = {
515 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
516 0, 46, /* A 46 in network order */
517 0, 0, /* DSAP=0 & SSAP=0 fields */
518 0xf3, 0 /* Control (Test Req + P bit set) */
519 };
520 unsigned long timenow = jiffies;
521
522 writereg(dev, PP_LineCTL, readreg(dev, PP_LineCTL) | SERIAL_TX_ON);
523
524 memcpy(test_packet, dev->dev_addr, ETH_ALEN);
525 memcpy(test_packet + ETH_ALEN, dev->dev_addr, ETH_ALEN);
526
527 iowrite16(TX_AFTER_ALL, lp->virt_addr + TX_CMD_PORT);
528 iowrite16(ETH_ZLEN, lp->virt_addr + TX_LEN_PORT);
529
530 /* Test to see if the chip has allocated memory for the packet */
531 while (time_before(jiffies, timenow + 5))
532 if (readreg(dev, PP_BusST) & READY_FOR_TX_NOW)
533 break;
534 if (time_after_eq(jiffies, timenow + 5))
535 return 0; /* this shouldn't happen */
536
537 /* Write the contents of the packet */
538 writewords(lp, TX_FRAME_PORT, test_packet, (ETH_ZLEN + 1) >> 1);
539
540 cs89_dbg(1, debug, "Sending test packet ");
541 /* wait a couple of jiffies for packet to be received */
542 for (timenow = jiffies; time_before(jiffies, timenow + 3);)
543 ;
544 if ((readreg(dev, PP_TxEvent) & TX_SEND_OK_BITS) == TX_OK) {
545 cs89_dbg(1, cont, "succeeded\n");
546 return 1;
547 }
548 cs89_dbg(1, cont, "failed\n");
549 return 0;
550}
551
552#define DETECTED_NONE 0
553#define DETECTED_RJ45H 1
554#define DETECTED_RJ45F 2
555#define DETECTED_AUI 3
556#define DETECTED_BNC 4
557
558static int
559detect_tp(struct net_device *dev)
560{
561 struct net_local *lp = netdev_priv(dev);
562 unsigned long timenow = jiffies;
563 int fdx;
564
565 cs89_dbg(1, debug, "%s: Attempting TP\n", dev->name);
566
567 /* If connected to another full duplex capable 10-Base-T card
568 * the link pulses seem to be lost when the auto detect bit in
569 * the LineCTL is set. To overcome this the auto detect bit will
570 * be cleared whilst testing the 10-Base-T interface. This would
571 * not be necessary for the sparrow chip but is simpler to do it
572 * anyway.
573 */
574 writereg(dev, PP_LineCTL, lp->linectl & ~AUI_ONLY);
575 control_dc_dc(dev, 0);
576
577 /* Delay for the hardware to work out if the TP cable is present
578 * - 150ms
579 */
580 for (timenow = jiffies; time_before(jiffies, timenow + 15);)
581 ;
582 if ((readreg(dev, PP_LineST) & LINK_OK) == 0)
583 return DETECTED_NONE;
584
585 if (lp->chip_type == CS8900) {
586 switch (lp->force & 0xf0) {
587#if 0
588 case FORCE_AUTO:
589 pr_info("%s: cs8900 doesn't autonegotiate\n",
590 dev->name);
591 return DETECTED_NONE;
592#endif
593 /* CS8900 doesn't support AUTO, change to HALF*/
594 case FORCE_AUTO:
595 lp->force &= ~FORCE_AUTO;
596 lp->force |= FORCE_HALF;
597 break;
598 case FORCE_HALF:
599 break;
600 case FORCE_FULL:
601 writereg(dev, PP_TestCTL,
602 readreg(dev, PP_TestCTL) | FDX_8900);
603 break;
604 }
605 fdx = readreg(dev, PP_TestCTL) & FDX_8900;
606 } else {
607 switch (lp->force & 0xf0) {
608 case FORCE_AUTO:
609 lp->auto_neg_cnf = AUTO_NEG_ENABLE;
610 break;
611 case FORCE_HALF:
612 lp->auto_neg_cnf = 0;
613 break;
614 case FORCE_FULL:
615 lp->auto_neg_cnf = RE_NEG_NOW | ALLOW_FDX;
616 break;
617 }
618
619 writereg(dev, PP_AutoNegCTL, lp->auto_neg_cnf & AUTO_NEG_MASK);
620
621 if ((lp->auto_neg_cnf & AUTO_NEG_BITS) == AUTO_NEG_ENABLE) {
622 pr_info("%s: negotiating duplex...\n", dev->name);
623 while (readreg(dev, PP_AutoNegST) & AUTO_NEG_BUSY) {
624 if (time_after(jiffies, timenow + 4000)) {
625 pr_err("**** Full / half duplex auto-negotiation timed out ****\n");
626 break;
627 }
628 }
629 }
630 fdx = readreg(dev, PP_AutoNegST) & FDX_ACTIVE;
631 }
632 if (fdx)
633 return DETECTED_RJ45F;
634 else
635 return DETECTED_RJ45H;
636}
637
638static int
639detect_bnc(struct net_device *dev)
640{
641 struct net_local *lp = netdev_priv(dev);
642
643 cs89_dbg(1, debug, "%s: Attempting BNC\n", dev->name);
644 control_dc_dc(dev, 1);
645
646 writereg(dev, PP_LineCTL, (lp->linectl & ~AUTO_AUI_10BASET) | AUI_ONLY);
647
648 if (send_test_pkt(dev))
649 return DETECTED_BNC;
650 else
651 return DETECTED_NONE;
652}
653
654static int
655detect_aui(struct net_device *dev)
656{
657 struct net_local *lp = netdev_priv(dev);
658
659 cs89_dbg(1, debug, "%s: Attempting AUI\n", dev->name);
660 control_dc_dc(dev, 0);
661
662 writereg(dev, PP_LineCTL, (lp->linectl & ~AUTO_AUI_10BASET) | AUI_ONLY);
663
664 if (send_test_pkt(dev))
665 return DETECTED_AUI;
666 else
667 return DETECTED_NONE;
668}
669
670/* We have a good packet(s), get it/them out of the buffers. */
671static void
672net_rx(struct net_device *dev)
673{
674 struct net_local *lp = netdev_priv(dev);
675 struct sk_buff *skb;
676 int status, length;
677
678 status = ioread16(lp->virt_addr + RX_FRAME_PORT);
679 length = ioread16(lp->virt_addr + RX_FRAME_PORT);
680
681 if ((status & RX_OK) == 0) {
682 count_rx_errors(status, dev);
683 return;
684 }
685
686 /* Malloc up new buffer. */
687 skb = netdev_alloc_skb(dev, length + 2);
688 if (skb == NULL) {
689 dev->stats.rx_dropped++;
690 return;
691 }
692 skb_reserve(skb, 2); /* longword align L3 header */
693
694 readwords(lp, RX_FRAME_PORT, skb_put(skb, length), length >> 1);
695 if (length & 1)
696 skb->data[length-1] = ioread16(lp->virt_addr + RX_FRAME_PORT);
697
698 cs89_dbg(3, debug, "%s: received %d byte packet of type %x\n",
699 dev->name, length,
700 (skb->data[ETH_ALEN + ETH_ALEN] << 8) |
701 skb->data[ETH_ALEN + ETH_ALEN + 1]);
702
703 skb->protocol = eth_type_trans(skb, dev);
704 netif_rx(skb);
705 dev->stats.rx_packets++;
706 dev->stats.rx_bytes += length;
707}
708
709/* The typical workload of the driver:
710 * Handle the network interface interrupts.
711 */
712
713static irqreturn_t net_interrupt(int irq, void *dev_id)
714{
715 struct net_device *dev = dev_id;
716 struct net_local *lp;
717 int status;
718 int handled = 0;
719
720 lp = netdev_priv(dev);
721
722 /* we MUST read all the events out of the ISQ, otherwise we'll never
723 * get interrupted again. As a consequence, we can't have any limit
724 * on the number of times we loop in the interrupt handler. The
725 * hardware guarantees that eventually we'll run out of events. Of
726 * course, if you're on a slow machine, and packets are arriving
727 * faster than you can read them off, you're screwed. Hasta la
728 * vista, baby!
729 */
730 while ((status = ioread16(lp->virt_addr + ISQ_PORT))) {
731 cs89_dbg(4, debug, "%s: event=%04x\n", dev->name, status);
732 handled = 1;
733 switch (status & ISQ_EVENT_MASK) {
734 case ISQ_RECEIVER_EVENT:
735 /* Got a packet(s). */
736 net_rx(dev);
737 break;
738 case ISQ_TRANSMITTER_EVENT:
739 dev->stats.tx_packets++;
740 netif_wake_queue(dev); /* Inform upper layers. */
741 if ((status & (TX_OK |
742 TX_LOST_CRS |
743 TX_SQE_ERROR |
744 TX_LATE_COL |
745 TX_16_COL)) != TX_OK) {
746 if ((status & TX_OK) == 0)
747 dev->stats.tx_errors++;
748 if (status & TX_LOST_CRS)
749 dev->stats.tx_carrier_errors++;
750 if (status & TX_SQE_ERROR)
751 dev->stats.tx_heartbeat_errors++;
752 if (status & TX_LATE_COL)
753 dev->stats.tx_window_errors++;
754 if (status & TX_16_COL)
755 dev->stats.tx_aborted_errors++;
756 }
757 break;
758 case ISQ_BUFFER_EVENT:
759 if (status & READY_FOR_TX) {
760 /* we tried to transmit a packet earlier,
761 * but inexplicably ran out of buffers.
762 * That shouldn't happen since we only ever
763 * load one packet. Shrug. Do the right
764 * thing anyway.
765 */
766 netif_wake_queue(dev); /* Inform upper layers. */
767 }
768 if (status & TX_UNDERRUN) {
769 cs89_dbg(0, err, "%s: transmit underrun\n",
770 dev->name);
771 lp->send_underrun++;
772 if (lp->send_underrun == 3)
773 lp->send_cmd = TX_AFTER_381;
774 else if (lp->send_underrun == 6)
775 lp->send_cmd = TX_AFTER_ALL;
776 /* transmit cycle is done, although
777 * frame wasn't transmitted - this
778 * avoids having to wait for the upper
779 * layers to timeout on us, in the
780 * event of a tx underrun
781 */
782 netif_wake_queue(dev); /* Inform upper layers. */
783 }
784#if ALLOW_DMA
785 if (lp->use_dma && (status & RX_DMA)) {
786 int count = readreg(dev, PP_DmaFrameCnt);
787 while (count) {
788 cs89_dbg(5, debug,
789 "%s: receiving %d DMA frames\n",
790 dev->name, count);
791 if (count > 1)
792 cs89_dbg(2, debug,
793 "%s: receiving %d DMA frames\n",
794 dev->name, count);
795 dma_rx(dev);
796 if (--count == 0)
797 count = readreg(dev, PP_DmaFrameCnt);
798 if (count > 0)
799 cs89_dbg(2, debug,
800 "%s: continuing with %d DMA frames\n",
801 dev->name, count);
802 }
803 }
804#endif
805 break;
806 case ISQ_RX_MISS_EVENT:
807 dev->stats.rx_missed_errors += (status >> 6);
808 break;
809 case ISQ_TX_COL_EVENT:
810 dev->stats.collisions += (status >> 6);
811 break;
812 }
813 }
814 return IRQ_RETVAL(handled);
815}
816
817/* Open/initialize the board. This is called (in the current kernel)
818 sometime after booting when the 'ifconfig' program is run.
819
820 This routine should set everything up anew at each open, even
821 registers that "should" only need to be set once at boot, so that
822 there is non-reboot way to recover if something goes wrong.
823*/
824
825/* AKPM: do we need to do any locking here? */
826
827static int
828net_open(struct net_device *dev)
829{
830 struct net_local *lp = netdev_priv(dev);
831 int result = 0;
832 int i;
833 int ret;
834
835 if (dev->irq < 2) {
836 /* Allow interrupts to be generated by the chip */
837/* Cirrus' release had this: */
838#if 0
839 writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) | ENABLE_IRQ);
840#endif
841/* And 2.3.47 had this: */
842 writereg(dev, PP_BusCTL, ENABLE_IRQ | MEMORY_ON);
843
844 for (i = 2; i < CS8920_NO_INTS; i++) {
845 if ((1 << i) & lp->irq_map) {
846 if (request_irq(i, net_interrupt, 0, dev->name,
847 dev) == 0) {
848 dev->irq = i;
849 write_irq(dev, lp->chip_type, i);
850 /* writereg(dev, PP_BufCFG, GENERATE_SW_INTERRUPT); */
851 break;
852 }
853 }
854 }
855
856 if (i >= CS8920_NO_INTS) {
857 writereg(dev, PP_BusCTL, 0); /* disable interrupts. */
858 pr_err("can't get an interrupt\n");
859 ret = -EAGAIN;
860 goto bad_out;
861 }
862 } else {
863#if IS_ENABLED(CONFIG_CS89x0_ISA)
864 if (((1 << dev->irq) & lp->irq_map) == 0) {
865 pr_err("%s: IRQ %d is not in our map of allowable IRQs, which is %x\n",
866 dev->name, dev->irq, lp->irq_map);
867 ret = -EAGAIN;
868 goto bad_out;
869 }
870#endif
871/* FIXME: Cirrus' release had this: */
872 writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL)|ENABLE_IRQ);
873/* And 2.3.47 had this: */
874#if 0
875 writereg(dev, PP_BusCTL, ENABLE_IRQ | MEMORY_ON);
876#endif
877 write_irq(dev, lp->chip_type, dev->irq);
878 ret = request_irq(dev->irq, net_interrupt, 0, dev->name, dev);
879 if (ret) {
880 pr_err("request_irq(%d) failed\n", dev->irq);
881 goto bad_out;
882 }
883 }
884
885#if ALLOW_DMA
886 if (lp->use_dma && (lp->isa_config & ANY_ISA_DMA)) {
887 unsigned long flags;
888 lp->dma_buff = (unsigned char *)__get_dma_pages(GFP_KERNEL,
889 get_order(lp->dmasize * 1024));
890 if (!lp->dma_buff) {
891 pr_err("%s: cannot get %dK memory for DMA\n",
892 dev->name, lp->dmasize);
893 goto release_irq;
894 }
895 cs89_dbg(1, debug, "%s: dma %lx %lx\n",
896 dev->name,
897 (unsigned long)lp->dma_buff,
898 (unsigned long)isa_virt_to_bus(lp->dma_buff));
899 if ((unsigned long)lp->dma_buff >= MAX_DMA_ADDRESS ||
900 !dma_page_eq(lp->dma_buff,
901 lp->dma_buff + lp->dmasize * 1024 - 1)) {
902 pr_err("%s: not usable as DMA buffer\n", dev->name);
903 goto release_irq;
904 }
905 memset(lp->dma_buff, 0, lp->dmasize * 1024); /* Why? */
906 if (request_dma(dev->dma, dev->name)) {
907 pr_err("%s: cannot get dma channel %d\n",
908 dev->name, dev->dma);
909 goto release_irq;
910 }
911 write_dma(dev, lp->chip_type, dev->dma);
912 lp->rx_dma_ptr = lp->dma_buff;
913 lp->end_dma_buff = lp->dma_buff + lp->dmasize * 1024;
914 spin_lock_irqsave(&lp->lock, flags);
915 disable_dma(dev->dma);
916 clear_dma_ff(dev->dma);
917 set_dma_mode(dev->dma, DMA_RX_MODE); /* auto_init as well */
918 set_dma_addr(dev->dma, isa_virt_to_bus(lp->dma_buff));
919 set_dma_count(dev->dma, lp->dmasize * 1024);
920 enable_dma(dev->dma);
921 spin_unlock_irqrestore(&lp->lock, flags);
922 }
923#endif /* ALLOW_DMA */
924
925 /* set the Ethernet address */
926 for (i = 0; i < ETH_ALEN / 2; i++)
927 writereg(dev, PP_IA + i * 2,
928 (dev->dev_addr[i * 2] |
929 (dev->dev_addr[i * 2 + 1] << 8)));
930
931 /* while we're testing the interface, leave interrupts disabled */
932 writereg(dev, PP_BusCTL, MEMORY_ON);
933
934 /* Set the LineCTL quintuplet based on adapter configuration read from EEPROM */
935 if ((lp->adapter_cnf & A_CNF_EXTND_10B_2) &&
936 (lp->adapter_cnf & A_CNF_LOW_RX_SQUELCH))
937 lp->linectl = LOW_RX_SQUELCH;
938 else
939 lp->linectl = 0;
940
941 /* check to make sure that they have the "right" hardware available */
942 switch (lp->adapter_cnf & A_CNF_MEDIA_TYPE) {
943 case A_CNF_MEDIA_10B_T:
944 result = lp->adapter_cnf & A_CNF_10B_T;
945 break;
946 case A_CNF_MEDIA_AUI:
947 result = lp->adapter_cnf & A_CNF_AUI;
948 break;
949 case A_CNF_MEDIA_10B_2:
950 result = lp->adapter_cnf & A_CNF_10B_2;
951 break;
952 default:
953 result = lp->adapter_cnf & (A_CNF_10B_T |
954 A_CNF_AUI |
955 A_CNF_10B_2);
956 }
957 if (!result) {
958 pr_err("%s: EEPROM is configured for unavailable media\n",
959 dev->name);
960release_dma:
961#if ALLOW_DMA
962 free_dma(dev->dma);
963release_irq:
964 release_dma_buff(lp);
965#endif
966 writereg(dev, PP_LineCTL,
967 readreg(dev, PP_LineCTL) & ~(SERIAL_TX_ON | SERIAL_RX_ON));
968 free_irq(dev->irq, dev);
969 ret = -EAGAIN;
970 goto bad_out;
971 }
972
973 /* set the hardware to the configured choice */
974 switch (lp->adapter_cnf & A_CNF_MEDIA_TYPE) {
975 case A_CNF_MEDIA_10B_T:
976 result = detect_tp(dev);
977 if (result == DETECTED_NONE) {
978 pr_warn("%s: 10Base-T (RJ-45) has no cable\n",
979 dev->name);
980 if (lp->auto_neg_cnf & IMM_BIT) /* check "ignore missing media" bit */
981 result = DETECTED_RJ45H; /* Yes! I don't care if I see a link pulse */
982 }
983 break;
984 case A_CNF_MEDIA_AUI:
985 result = detect_aui(dev);
986 if (result == DETECTED_NONE) {
987 pr_warn("%s: 10Base-5 (AUI) has no cable\n", dev->name);
988 if (lp->auto_neg_cnf & IMM_BIT) /* check "ignore missing media" bit */
989 result = DETECTED_AUI; /* Yes! I don't care if I see a carrier */
990 }
991 break;
992 case A_CNF_MEDIA_10B_2:
993 result = detect_bnc(dev);
994 if (result == DETECTED_NONE) {
995 pr_warn("%s: 10Base-2 (BNC) has no cable\n", dev->name);
996 if (lp->auto_neg_cnf & IMM_BIT) /* check "ignore missing media" bit */
997 result = DETECTED_BNC; /* Yes! I don't care if I can xmit a packet */
998 }
999 break;
1000 case A_CNF_MEDIA_AUTO:
1001 writereg(dev, PP_LineCTL, lp->linectl | AUTO_AUI_10BASET);
1002 if (lp->adapter_cnf & A_CNF_10B_T) {
1003 result = detect_tp(dev);
1004 if (result != DETECTED_NONE)
1005 break;
1006 }
1007 if (lp->adapter_cnf & A_CNF_AUI) {
1008 result = detect_aui(dev);
1009 if (result != DETECTED_NONE)
1010 break;
1011 }
1012 if (lp->adapter_cnf & A_CNF_10B_2) {
1013 result = detect_bnc(dev);
1014 if (result != DETECTED_NONE)
1015 break;
1016 }
1017 pr_err("%s: no media detected\n", dev->name);
1018 goto release_dma;
1019 }
1020 switch (result) {
1021 case DETECTED_NONE:
1022 pr_err("%s: no network cable attached to configured media\n",
1023 dev->name);
1024 goto release_dma;
1025 case DETECTED_RJ45H:
1026 pr_info("%s: using half-duplex 10Base-T (RJ-45)\n", dev->name);
1027 break;
1028 case DETECTED_RJ45F:
1029 pr_info("%s: using full-duplex 10Base-T (RJ-45)\n", dev->name);
1030 break;
1031 case DETECTED_AUI:
1032 pr_info("%s: using 10Base-5 (AUI)\n", dev->name);
1033 break;
1034 case DETECTED_BNC:
1035 pr_info("%s: using 10Base-2 (BNC)\n", dev->name);
1036 break;
1037 }
1038
1039 /* Turn on both receive and transmit operations */
1040 writereg(dev, PP_LineCTL,
1041 readreg(dev, PP_LineCTL) | SERIAL_RX_ON | SERIAL_TX_ON);
1042
1043 /* Receive only error free packets addressed to this card */
1044 lp->rx_mode = 0;
1045 writereg(dev, PP_RxCTL, DEF_RX_ACCEPT);
1046
1047 lp->curr_rx_cfg = RX_OK_ENBL | RX_CRC_ERROR_ENBL;
1048
1049 if (lp->isa_config & STREAM_TRANSFER)
1050 lp->curr_rx_cfg |= RX_STREAM_ENBL;
1051#if ALLOW_DMA
1052 set_dma_cfg(dev);
1053#endif
1054 writereg(dev, PP_RxCFG, lp->curr_rx_cfg);
1055
1056 writereg(dev, PP_TxCFG, (TX_LOST_CRS_ENBL |
1057 TX_SQE_ERROR_ENBL |
1058 TX_OK_ENBL |
1059 TX_LATE_COL_ENBL |
1060 TX_JBR_ENBL |
1061 TX_ANY_COL_ENBL |
1062 TX_16_COL_ENBL));
1063
1064 writereg(dev, PP_BufCFG, (READY_FOR_TX_ENBL |
1065 RX_MISS_COUNT_OVRFLOW_ENBL |
1066#if ALLOW_DMA
1067 dma_bufcfg(dev) |
1068#endif
1069 TX_COL_COUNT_OVRFLOW_ENBL |
1070 TX_UNDERRUN_ENBL));
1071
1072 /* now that we've got our act together, enable everything */
1073 writereg(dev, PP_BusCTL, (ENABLE_IRQ
1074 | (dev->mem_start ? MEMORY_ON : 0) /* turn memory on */
1075#if ALLOW_DMA
1076 | dma_busctl(dev)
1077#endif
1078 ));
1079 netif_start_queue(dev);
1080 cs89_dbg(1, debug, "net_open() succeeded\n");
1081 return 0;
1082bad_out:
1083 return ret;
1084}
1085
1086/* The inverse routine to net_open(). */
1087static int
1088net_close(struct net_device *dev)
1089{
1090#if ALLOW_DMA
1091 struct net_local *lp = netdev_priv(dev);
1092#endif
1093
1094 netif_stop_queue(dev);
1095
1096 writereg(dev, PP_RxCFG, 0);
1097 writereg(dev, PP_TxCFG, 0);
1098 writereg(dev, PP_BufCFG, 0);
1099 writereg(dev, PP_BusCTL, 0);
1100
1101 free_irq(dev->irq, dev);
1102
1103#if ALLOW_DMA
1104 if (lp->use_dma && lp->dma) {
1105 free_dma(dev->dma);
1106 release_dma_buff(lp);
1107 }
1108#endif
1109
1110 /* Update the statistics here. */
1111 return 0;
1112}
1113
1114/* Get the current statistics.
1115 * This may be called with the card open or closed.
1116 */
1117static struct net_device_stats *
1118net_get_stats(struct net_device *dev)
1119{
1120 struct net_local *lp = netdev_priv(dev);
1121 unsigned long flags;
1122
1123 spin_lock_irqsave(&lp->lock, flags);
1124 /* Update the statistics from the device registers. */
1125 dev->stats.rx_missed_errors += (readreg(dev, PP_RxMiss) >> 6);
1126 dev->stats.collisions += (readreg(dev, PP_TxCol) >> 6);
1127 spin_unlock_irqrestore(&lp->lock, flags);
1128
1129 return &dev->stats;
1130}
1131
1132static void net_timeout(struct net_device *dev, unsigned int txqueue)
1133{
1134 /* If we get here, some higher level has decided we are broken.
1135 There should really be a "kick me" function call instead. */
1136 cs89_dbg(0, err, "%s: transmit timed out, %s?\n",
1137 dev->name,
1138 tx_done(dev) ? "IRQ conflict" : "network cable problem");
1139 /* Try to restart the adaptor. */
1140 netif_wake_queue(dev);
1141}
1142
1143static netdev_tx_t net_send_packet(struct sk_buff *skb, struct net_device *dev)
1144{
1145 struct net_local *lp = netdev_priv(dev);
1146 unsigned long flags;
1147
1148 cs89_dbg(3, debug, "%s: sent %d byte packet of type %x\n",
1149 dev->name, skb->len,
1150 ((skb->data[ETH_ALEN + ETH_ALEN] << 8) |
1151 skb->data[ETH_ALEN + ETH_ALEN + 1]));
1152
1153 /* keep the upload from being interrupted, since we
1154 * ask the chip to start transmitting before the
1155 * whole packet has been completely uploaded.
1156 */
1157
1158 spin_lock_irqsave(&lp->lock, flags);
1159 netif_stop_queue(dev);
1160
1161 /* initiate a transmit sequence */
1162 iowrite16(lp->send_cmd, lp->virt_addr + TX_CMD_PORT);
1163 iowrite16(skb->len, lp->virt_addr + TX_LEN_PORT);
1164
1165 /* Test to see if the chip has allocated memory for the packet */
1166 if ((readreg(dev, PP_BusST) & READY_FOR_TX_NOW) == 0) {
1167 /* Gasp! It hasn't. But that shouldn't happen since
1168 * we're waiting for TxOk, so return 1 and requeue this packet.
1169 */
1170
1171 spin_unlock_irqrestore(&lp->lock, flags);
1172 cs89_dbg(0, err, "Tx buffer not free!\n");
1173 return NETDEV_TX_BUSY;
1174 }
1175 /* Write the contents of the packet */
1176 writewords(lp, TX_FRAME_PORT, skb->data, (skb->len + 1) >> 1);
1177 spin_unlock_irqrestore(&lp->lock, flags);
1178 dev->stats.tx_bytes += skb->len;
1179 dev_consume_skb_any(skb);
1180
1181 /* We DO NOT call netif_wake_queue() here.
1182 * We also DO NOT call netif_start_queue().
1183 *
1184 * Either of these would cause another bottom half run through
1185 * net_send_packet() before this packet has fully gone out.
1186 * That causes us to hit the "Gasp!" above and the send is rescheduled.
1187 * it runs like a dog. We just return and wait for the Tx completion
1188 * interrupt handler to restart the netdevice layer
1189 */
1190
1191 return NETDEV_TX_OK;
1192}
1193
1194static void set_multicast_list(struct net_device *dev)
1195{
1196 struct net_local *lp = netdev_priv(dev);
1197 unsigned long flags;
1198 u16 cfg;
1199
1200 spin_lock_irqsave(&lp->lock, flags);
1201 if (dev->flags & IFF_PROMISC)
1202 lp->rx_mode = RX_ALL_ACCEPT;
1203 else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev))
1204 /* The multicast-accept list is initialized to accept-all,
1205 * and we rely on higher-level filtering for now.
1206 */
1207 lp->rx_mode = RX_MULTCAST_ACCEPT;
1208 else
1209 lp->rx_mode = 0;
1210
1211 writereg(dev, PP_RxCTL, DEF_RX_ACCEPT | lp->rx_mode);
1212
1213 /* in promiscuous mode, we accept errored packets,
1214 * so we have to enable interrupts on them also
1215 */
1216 cfg = lp->curr_rx_cfg;
1217 if (lp->rx_mode == RX_ALL_ACCEPT)
1218 cfg |= RX_CRC_ERROR_ENBL | RX_RUNT_ENBL | RX_EXTRA_DATA_ENBL;
1219 writereg(dev, PP_RxCFG, cfg);
1220 spin_unlock_irqrestore(&lp->lock, flags);
1221}
1222
1223static int set_mac_address(struct net_device *dev, void *p)
1224{
1225 int i;
1226 struct sockaddr *addr = p;
1227
1228 if (netif_running(dev))
1229 return -EBUSY;
1230
1231 eth_hw_addr_set(dev, addr->sa_data);
1232
1233 cs89_dbg(0, debug, "%s: Setting MAC address to %pM\n",
1234 dev->name, dev->dev_addr);
1235
1236 /* set the Ethernet address */
1237 for (i = 0; i < ETH_ALEN / 2; i++)
1238 writereg(dev, PP_IA + i * 2,
1239 (dev->dev_addr[i * 2] |
1240 (dev->dev_addr[i * 2 + 1] << 8)));
1241
1242 return 0;
1243}
1244
1245#ifdef CONFIG_NET_POLL_CONTROLLER
1246/*
1247 * Polling receive - used by netconsole and other diagnostic tools
1248 * to allow network i/o with interrupts disabled.
1249 */
1250static void net_poll_controller(struct net_device *dev)
1251{
1252 disable_irq(dev->irq);
1253 net_interrupt(dev->irq, dev);
1254 enable_irq(dev->irq);
1255}
1256#endif
1257
1258static const struct net_device_ops net_ops = {
1259 .ndo_open = net_open,
1260 .ndo_stop = net_close,
1261 .ndo_tx_timeout = net_timeout,
1262 .ndo_start_xmit = net_send_packet,
1263 .ndo_get_stats = net_get_stats,
1264 .ndo_set_rx_mode = set_multicast_list,
1265 .ndo_set_mac_address = set_mac_address,
1266#ifdef CONFIG_NET_POLL_CONTROLLER
1267 .ndo_poll_controller = net_poll_controller,
1268#endif
1269 .ndo_validate_addr = eth_validate_addr,
1270};
1271
1272static void __init reset_chip(struct net_device *dev)
1273{
1274#if !defined(CONFIG_MACH_MX31ADS)
1275 struct net_local *lp = netdev_priv(dev);
1276 unsigned long reset_start_time;
1277
1278 writereg(dev, PP_SelfCTL, readreg(dev, PP_SelfCTL) | POWER_ON_RESET);
1279
1280 /* wait 30 ms */
1281 msleep(30);
1282
1283 if (lp->chip_type != CS8900) {
1284 /* Hardware problem requires PNP registers to be reconfigured after a reset */
1285 iowrite16(PP_CS8920_ISAINT, lp->virt_addr + ADD_PORT);
1286 iowrite8(dev->irq, lp->virt_addr + DATA_PORT);
1287 iowrite8(0, lp->virt_addr + DATA_PORT + 1);
1288
1289 iowrite16(PP_CS8920_ISAMemB, lp->virt_addr + ADD_PORT);
1290 iowrite8((dev->mem_start >> 16) & 0xff,
1291 lp->virt_addr + DATA_PORT);
1292 iowrite8((dev->mem_start >> 8) & 0xff,
1293 lp->virt_addr + DATA_PORT + 1);
1294 }
1295
1296 /* Wait until the chip is reset */
1297 reset_start_time = jiffies;
1298 while ((readreg(dev, PP_SelfST) & INIT_DONE) == 0 &&
1299 time_before(jiffies, reset_start_time + 2))
1300 ;
1301#endif /* !CONFIG_MACH_MX31ADS */
1302}
1303
1304/* This is the real probe routine.
1305 * Linux has a history of friendly device probes on the ISA bus.
1306 * A good device probes avoids doing writes, and
1307 * verifies that the correct device exists and functions.
1308 * Return 0 on success.
1309 */
1310static int __init
1311cs89x0_probe1(struct net_device *dev, void __iomem *ioaddr, int modular)
1312{
1313 struct net_local *lp = netdev_priv(dev);
1314 int i;
1315 int tmp;
1316 unsigned rev_type = 0;
1317 int eeprom_buff[CHKSUM_LEN];
1318 u8 addr[ETH_ALEN];
1319 int retval;
1320
1321 /* Initialize the device structure. */
1322 if (!modular) {
1323 memset(lp, 0, sizeof(*lp));
1324 spin_lock_init(&lp->lock);
1325#ifndef MODULE
1326#if ALLOW_DMA
1327 if (g_cs89x0_dma) {
1328 lp->use_dma = 1;
1329 lp->dma = g_cs89x0_dma;
1330 lp->dmasize = 16; /* Could make this an option... */
1331 }
1332#endif
1333 lp->force = g_cs89x0_media__force;
1334#endif
1335 }
1336
1337 pr_debug("PP_addr at %p[%x]: 0x%x\n",
1338 ioaddr, ADD_PORT, ioread16(ioaddr + ADD_PORT));
1339 iowrite16(PP_ChipID, ioaddr + ADD_PORT);
1340
1341 tmp = ioread16(ioaddr + DATA_PORT);
1342 if (tmp != CHIP_EISA_ID_SIG) {
1343 pr_debug("%s: incorrect signature at %p[%x]: 0x%x!="
1344 CHIP_EISA_ID_SIG_STR "\n",
1345 dev->name, ioaddr, DATA_PORT, tmp);
1346 retval = -ENODEV;
1347 goto out1;
1348 }
1349
1350 lp->virt_addr = ioaddr;
1351
1352 /* get the chip type */
1353 rev_type = readreg(dev, PRODUCT_ID_ADD);
1354 lp->chip_type = rev_type & ~REVISON_BITS;
1355 lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';
1356
1357 /* Check the chip type and revision in order to set the correct
1358 * send command. CS8920 revision C and CS8900 revision F can use
1359 * the faster send.
1360 */
1361 lp->send_cmd = TX_AFTER_381;
1362 if (lp->chip_type == CS8900 && lp->chip_revision >= 'F')
1363 lp->send_cmd = TX_NOW;
1364 if (lp->chip_type != CS8900 && lp->chip_revision >= 'C')
1365 lp->send_cmd = TX_NOW;
1366
1367 pr_info_once("%s\n", version);
1368
1369 pr_info("%s: cs89%c0%s rev %c found at %p ",
1370 dev->name,
1371 lp->chip_type == CS8900 ? '0' : '2',
1372 lp->chip_type == CS8920M ? "M" : "",
1373 lp->chip_revision,
1374 lp->virt_addr);
1375
1376 reset_chip(dev);
1377
1378 /* Here we read the current configuration of the chip.
1379 * If there is no Extended EEPROM then the idea is to not disturb
1380 * the chip configuration, it should have been correctly setup by
1381 * automatic EEPROM read on reset. So, if the chip says it read
1382 * the EEPROM the driver will always do *something* instead of
1383 * complain that adapter_cnf is 0.
1384 */
1385
1386 if ((readreg(dev, PP_SelfST) & (EEPROM_OK | EEPROM_PRESENT)) ==
1387 (EEPROM_OK | EEPROM_PRESENT)) {
1388 /* Load the MAC. */
1389 for (i = 0; i < ETH_ALEN / 2; i++) {
1390 unsigned int Addr;
1391 Addr = readreg(dev, PP_IA + i * 2);
1392 addr[i * 2] = Addr & 0xFF;
1393 addr[i * 2 + 1] = Addr >> 8;
1394 }
1395 eth_hw_addr_set(dev, addr);
1396
1397 /* Load the Adapter Configuration.
1398 * Note: Barring any more specific information from some
1399 * other source (ie EEPROM+Schematics), we would not know
1400 * how to operate a 10Base2 interface on the AUI port.
1401 * However, since we do read the status of HCB1 and use
1402 * settings that always result in calls to control_dc_dc(dev,0)
1403 * a BNC interface should work if the enable pin
1404 * (dc/dc converter) is on HCB1.
1405 * It will be called AUI however.
1406 */
1407
1408 lp->adapter_cnf = 0;
1409 i = readreg(dev, PP_LineCTL);
1410 /* Preserve the setting of the HCB1 pin. */
1411 if ((i & (HCB1 | HCB1_ENBL)) == (HCB1 | HCB1_ENBL))
1412 lp->adapter_cnf |= A_CNF_DC_DC_POLARITY;
1413 /* Save the sqelch bit */
1414 if ((i & LOW_RX_SQUELCH) == LOW_RX_SQUELCH)
1415 lp->adapter_cnf |= A_CNF_EXTND_10B_2 | A_CNF_LOW_RX_SQUELCH;
1416 /* Check if the card is in 10Base-t only mode */
1417 if ((i & (AUI_ONLY | AUTO_AUI_10BASET)) == 0)
1418 lp->adapter_cnf |= A_CNF_10B_T | A_CNF_MEDIA_10B_T;
1419 /* Check if the card is in AUI only mode */
1420 if ((i & (AUI_ONLY | AUTO_AUI_10BASET)) == AUI_ONLY)
1421 lp->adapter_cnf |= A_CNF_AUI | A_CNF_MEDIA_AUI;
1422 /* Check if the card is in Auto mode. */
1423 if ((i & (AUI_ONLY | AUTO_AUI_10BASET)) == AUTO_AUI_10BASET)
1424 lp->adapter_cnf |= A_CNF_AUI | A_CNF_10B_T |
1425 A_CNF_MEDIA_AUI | A_CNF_MEDIA_10B_T | A_CNF_MEDIA_AUTO;
1426
1427 cs89_dbg(1, info, "%s: PP_LineCTL=0x%x, adapter_cnf=0x%x\n",
1428 dev->name, i, lp->adapter_cnf);
1429
1430 /* IRQ. Other chips already probe, see below. */
1431 if (lp->chip_type == CS8900)
1432 lp->isa_config = readreg(dev, PP_CS8900_ISAINT) & INT_NO_MASK;
1433
1434 pr_cont("[Cirrus EEPROM] ");
1435 }
1436
1437 pr_cont("\n");
1438
1439 /* First check to see if an EEPROM is attached. */
1440
1441 if ((readreg(dev, PP_SelfST) & EEPROM_PRESENT) == 0)
1442 pr_warn("No EEPROM, relying on command line....\n");
1443 else if (get_eeprom_data(dev, START_EEPROM_DATA, CHKSUM_LEN, eeprom_buff) < 0) {
1444 pr_warn("EEPROM read failed, relying on command line\n");
1445 } else if (get_eeprom_cksum(START_EEPROM_DATA, CHKSUM_LEN, eeprom_buff) < 0) {
1446 /* Check if the chip was able to read its own configuration starting
1447 at 0 in the EEPROM*/
1448 if ((readreg(dev, PP_SelfST) & (EEPROM_OK | EEPROM_PRESENT)) !=
1449 (EEPROM_OK | EEPROM_PRESENT))
1450 pr_warn("Extended EEPROM checksum bad and no Cirrus EEPROM, relying on command line\n");
1451
1452 } else {
1453 /* This reads an extended EEPROM that is not documented
1454 * in the CS8900 datasheet.
1455 */
1456
1457 /* get transmission control word but keep the autonegotiation bits */
1458 if (!lp->auto_neg_cnf)
1459 lp->auto_neg_cnf = eeprom_buff[AUTO_NEG_CNF_OFFSET / 2];
1460 /* Store adapter configuration */
1461 if (!lp->adapter_cnf)
1462 lp->adapter_cnf = eeprom_buff[ADAPTER_CNF_OFFSET / 2];
1463 /* Store ISA configuration */
1464 lp->isa_config = eeprom_buff[ISA_CNF_OFFSET / 2];
1465 dev->mem_start = eeprom_buff[PACKET_PAGE_OFFSET / 2] << 8;
1466
1467 /* eeprom_buff has 32-bit ints, so we can't just memcpy it */
1468 /* store the initial memory base address */
1469 for (i = 0; i < ETH_ALEN / 2; i++) {
1470 addr[i * 2] = eeprom_buff[i];
1471 addr[i * 2 + 1] = eeprom_buff[i] >> 8;
1472 }
1473 eth_hw_addr_set(dev, addr);
1474 cs89_dbg(1, debug, "%s: new adapter_cnf: 0x%x\n",
1475 dev->name, lp->adapter_cnf);
1476 }
1477
1478 /* allow them to force multiple transceivers. If they force multiple, autosense */
1479 {
1480 int count = 0;
1481 if (lp->force & FORCE_RJ45) {
1482 lp->adapter_cnf |= A_CNF_10B_T;
1483 count++;
1484 }
1485 if (lp->force & FORCE_AUI) {
1486 lp->adapter_cnf |= A_CNF_AUI;
1487 count++;
1488 }
1489 if (lp->force & FORCE_BNC) {
1490 lp->adapter_cnf |= A_CNF_10B_2;
1491 count++;
1492 }
1493 if (count > 1)
1494 lp->adapter_cnf |= A_CNF_MEDIA_AUTO;
1495 else if (lp->force & FORCE_RJ45)
1496 lp->adapter_cnf |= A_CNF_MEDIA_10B_T;
1497 else if (lp->force & FORCE_AUI)
1498 lp->adapter_cnf |= A_CNF_MEDIA_AUI;
1499 else if (lp->force & FORCE_BNC)
1500 lp->adapter_cnf |= A_CNF_MEDIA_10B_2;
1501 }
1502
1503 cs89_dbg(1, debug, "%s: after force 0x%x, adapter_cnf=0x%x\n",
1504 dev->name, lp->force, lp->adapter_cnf);
1505
1506 /* FIXME: We don't let you set dc-dc polarity or low RX squelch from the command line: add it here */
1507
1508 /* FIXME: We don't let you set the IMM bit from the command line: add it to lp->auto_neg_cnf here */
1509
1510 /* FIXME: we don't set the Ethernet address on the command line. Use
1511 * ifconfig IFACE hw ether AABBCCDDEEFF
1512 */
1513
1514 pr_info("media %s%s%s",
1515 (lp->adapter_cnf & A_CNF_10B_T) ? "RJ-45," : "",
1516 (lp->adapter_cnf & A_CNF_AUI) ? "AUI," : "",
1517 (lp->adapter_cnf & A_CNF_10B_2) ? "BNC," : "");
1518
1519 lp->irq_map = 0xffff;
1520
1521 /* If this is a CS8900 then no pnp soft */
1522 if (lp->chip_type != CS8900 &&
1523 /* Check if the ISA IRQ has been set */
1524 (i = readreg(dev, PP_CS8920_ISAINT) & 0xff,
1525 (i != 0 && i < CS8920_NO_INTS))) {
1526 if (!dev->irq)
1527 dev->irq = i;
1528 } else {
1529 i = lp->isa_config & INT_NO_MASK;
1530#if IS_ENABLED(CONFIG_CS89x0_ISA)
1531 if (lp->chip_type == CS8900) {
1532 /* Translate the IRQ using the IRQ mapping table. */
1533 if (i >= ARRAY_SIZE(cs8900_irq_map))
1534 pr_err("invalid ISA interrupt number %d\n", i);
1535 else
1536 i = cs8900_irq_map[i];
1537
1538 lp->irq_map = CS8900_IRQ_MAP; /* fixed IRQ map for CS8900 */
1539 } else {
1540 int irq_map_buff[IRQ_MAP_LEN/2];
1541
1542 if (get_eeprom_data(dev, IRQ_MAP_EEPROM_DATA,
1543 IRQ_MAP_LEN / 2,
1544 irq_map_buff) >= 0) {
1545 if ((irq_map_buff[0] & 0xff) == PNP_IRQ_FRMT)
1546 lp->irq_map = ((irq_map_buff[0] >> 8) |
1547 (irq_map_buff[1] << 8));
1548 }
1549 }
1550#endif
1551 if (!dev->irq)
1552 dev->irq = i;
1553 }
1554
1555 pr_cont(" IRQ %d", dev->irq);
1556
1557#if ALLOW_DMA
1558 if (lp->use_dma) {
1559 get_dma_channel(dev);
1560 pr_cont(", DMA %d", dev->dma);
1561 } else
1562#endif
1563 pr_cont(", programmed I/O");
1564
1565 /* print the ethernet address. */
1566 pr_cont(", MAC %pM\n", dev->dev_addr);
1567
1568 dev->netdev_ops = &net_ops;
1569 dev->watchdog_timeo = HZ;
1570
1571 cs89_dbg(0, info, "cs89x0_probe1() successful\n");
1572
1573 retval = register_netdev(dev);
1574 if (retval)
1575 goto out2;
1576 return 0;
1577out2:
1578 iowrite16(PP_ChipID, lp->virt_addr + ADD_PORT);
1579out1:
1580 return retval;
1581}
1582
1583#if IS_ENABLED(CONFIG_CS89x0_ISA)
1584/*
1585 * This function converts the I/O port address used by the cs89x0_probe() and
1586 * init_module() functions to the I/O memory address used by the
1587 * cs89x0_probe1() function.
1588 */
1589static int __init
1590cs89x0_ioport_probe(struct net_device *dev, unsigned long ioport, int modular)
1591{
1592 struct net_local *lp = netdev_priv(dev);
1593 int ret;
1594 void __iomem *io_mem;
1595
1596 if (!lp)
1597 return -ENOMEM;
1598
1599 dev->base_addr = ioport;
1600
1601 if (!request_region(ioport, NETCARD_IO_EXTENT, DRV_NAME)) {
1602 ret = -EBUSY;
1603 goto out;
1604 }
1605
1606 io_mem = ioport_map(ioport & ~3, NETCARD_IO_EXTENT);
1607 if (!io_mem) {
1608 ret = -ENOMEM;
1609 goto release;
1610 }
1611
1612 /* if they give us an odd I/O address, then do ONE write to
1613 * the address port, to get it back to address zero, where we
1614 * expect to find the EISA signature word. An IO with a base of 0x3
1615 * will skip the test for the ADD_PORT.
1616 */
1617 if (ioport & 1) {
1618 cs89_dbg(1, info, "%s: odd ioaddr 0x%lx\n", dev->name, ioport);
1619 if ((ioport & 2) != 2) {
1620 if ((ioread16(io_mem + ADD_PORT) & ADD_MASK) !=
1621 ADD_SIG) {
1622 pr_err("%s: bad signature 0x%x\n",
1623 dev->name, ioread16(io_mem + ADD_PORT));
1624 ret = -ENODEV;
1625 goto unmap;
1626 }
1627 }
1628 }
1629
1630 ret = cs89x0_probe1(dev, io_mem, modular);
1631 if (!ret)
1632 goto out;
1633unmap:
1634 ioport_unmap(io_mem);
1635release:
1636 release_region(ioport, NETCARD_IO_EXTENT);
1637out:
1638 return ret;
1639}
1640
1641#ifndef MODULE
1642/* Check for a network adaptor of this type, and return '0' iff one exists.
1643 * If dev->base_addr == 0, probe all likely locations.
1644 * If dev->base_addr == 1, always return failure.
1645 * If dev->base_addr == 2, allocate space for the device and return success
1646 * (detachable devices only).
1647 * Return 0 on success.
1648 */
1649
1650struct net_device * __init cs89x0_probe(int unit)
1651{
1652 struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
1653 unsigned *port;
1654 int err = 0;
1655 int irq;
1656 int io;
1657
1658 if (!dev)
1659 return ERR_PTR(-ENODEV);
1660
1661 sprintf(dev->name, "eth%d", unit);
1662 netdev_boot_setup_check(dev);
1663 io = dev->base_addr;
1664 irq = dev->irq;
1665
1666 cs89_dbg(0, info, "cs89x0_probe(0x%x)\n", io);
1667
1668 if (io > 0x1ff) { /* Check a single specified location. */
1669 err = cs89x0_ioport_probe(dev, io, 0);
1670 } else if (io != 0) { /* Don't probe at all. */
1671 err = -ENXIO;
1672 } else {
1673 for (port = netcard_portlist; *port; port++) {
1674 if (cs89x0_ioport_probe(dev, *port, 0) == 0)
1675 break;
1676 dev->irq = irq;
1677 }
1678 if (!*port)
1679 err = -ENODEV;
1680 }
1681 if (err)
1682 goto out;
1683 return dev;
1684out:
1685 free_netdev(dev);
1686 pr_warn("no cs8900 or cs8920 detected. Be sure to disable PnP with SETUP\n");
1687 return ERR_PTR(err);
1688}
1689#else
1690static struct net_device *dev_cs89x0;
1691
1692/* Support the 'debug' module parm even if we're compiled for non-debug to
1693 * avoid breaking someone's startup scripts
1694 */
1695
1696static int io;
1697static int irq;
1698static int debug;
1699static char media[8];
1700static int duplex = -1;
1701
1702static int use_dma; /* These generate unused var warnings if ALLOW_DMA = 0 */
1703static int dma;
1704static int dmasize = 16; /* or 64 */
1705
1706module_param_hw(io, int, ioport, 0);
1707module_param_hw(irq, int, irq, 0);
1708module_param(debug, int, 0);
1709module_param_string(media, media, sizeof(media), 0);
1710module_param(duplex, int, 0);
1711module_param_hw(dma , int, dma, 0);
1712module_param(dmasize , int, 0);
1713module_param(use_dma , int, 0);
1714MODULE_PARM_DESC(io, "cs89x0 I/O base address");
1715MODULE_PARM_DESC(irq, "cs89x0 IRQ number");
1716#if DEBUGGING
1717MODULE_PARM_DESC(debug, "cs89x0 debug level (0-6)");
1718#else
1719MODULE_PARM_DESC(debug, "(ignored)");
1720#endif
1721MODULE_PARM_DESC(media, "Set cs89x0 adapter(s) media type(s) (rj45,bnc,aui)");
1722/* No other value than -1 for duplex seems to be currently interpreted */
1723MODULE_PARM_DESC(duplex, "(ignored)");
1724#if ALLOW_DMA
1725MODULE_PARM_DESC(dma , "cs89x0 ISA DMA channel; ignored if use_dma=0");
1726MODULE_PARM_DESC(dmasize , "cs89x0 DMA size in kB (16,64); ignored if use_dma=0");
1727MODULE_PARM_DESC(use_dma , "cs89x0 using DMA (0-1)");
1728#else
1729MODULE_PARM_DESC(dma , "(ignored)");
1730MODULE_PARM_DESC(dmasize , "(ignored)");
1731MODULE_PARM_DESC(use_dma , "(ignored)");
1732#endif
1733
1734MODULE_AUTHOR("Mike Cruse, Russwll Nelson <nelson@crynwr.com>, Andrew Morton");
1735MODULE_LICENSE("GPL");
1736
1737/*
1738 * media=t - specify media type
1739 * or media=2
1740 * or media=aui
1741 * or medai=auto
1742 * duplex=0 - specify forced half/full/autonegotiate duplex
1743 * debug=# - debug level
1744 *
1745 * Default Chip Configuration:
1746 * DMA Burst = enabled
1747 * IOCHRDY Enabled = enabled
1748 * UseSA = enabled
1749 * CS8900 defaults to half-duplex if not specified on command-line
1750 * CS8920 defaults to autoneg if not specified on command-line
1751 * Use reset defaults for other config parameters
1752 *
1753 * Assumptions:
1754 * media type specified is supported (circuitry is present)
1755 * if memory address is > 1MB, then required mem decode hw is present
1756 * if 10B-2, then agent other than driver will enable DC/DC converter
1757 * (hw or software util)
1758 */
1759
1760static int __init cs89x0_isa_init_module(void)
1761{
1762 struct net_device *dev;
1763 struct net_local *lp;
1764 int ret = 0;
1765
1766#if DEBUGGING
1767 net_debug = debug;
1768#else
1769 debug = 0;
1770#endif
1771 dev = alloc_etherdev(sizeof(struct net_local));
1772 if (!dev)
1773 return -ENOMEM;
1774
1775 dev->irq = irq;
1776 dev->base_addr = io;
1777 lp = netdev_priv(dev);
1778
1779#if ALLOW_DMA
1780 if (use_dma) {
1781 lp->use_dma = use_dma;
1782 lp->dma = dma;
1783 lp->dmasize = dmasize;
1784 }
1785#endif
1786
1787 spin_lock_init(&lp->lock);
1788
1789 /* boy, they'd better get these right */
1790 if (!strcmp(media, "rj45"))
1791 lp->adapter_cnf = A_CNF_MEDIA_10B_T | A_CNF_10B_T;
1792 else if (!strcmp(media, "aui"))
1793 lp->adapter_cnf = A_CNF_MEDIA_AUI | A_CNF_AUI;
1794 else if (!strcmp(media, "bnc"))
1795 lp->adapter_cnf = A_CNF_MEDIA_10B_2 | A_CNF_10B_2;
1796 else
1797 lp->adapter_cnf = A_CNF_MEDIA_10B_T | A_CNF_10B_T;
1798
1799 if (duplex == -1)
1800 lp->auto_neg_cnf = AUTO_NEG_ENABLE;
1801
1802 if (io == 0) {
1803 pr_err("Module autoprobing not allowed\n");
1804 pr_err("Append io=0xNNN\n");
1805 ret = -EPERM;
1806 goto out;
1807 } else if (io <= 0x1ff) {
1808 ret = -ENXIO;
1809 goto out;
1810 }
1811
1812#if ALLOW_DMA
1813 if (use_dma && dmasize != 16 && dmasize != 64) {
1814 pr_err("dma size must be either 16K or 64K, not %dK\n",
1815 dmasize);
1816 ret = -EPERM;
1817 goto out;
1818 }
1819#endif
1820 ret = cs89x0_ioport_probe(dev, io, 1);
1821 if (ret)
1822 goto out;
1823
1824 dev_cs89x0 = dev;
1825 return 0;
1826out:
1827 free_netdev(dev);
1828 return ret;
1829}
1830module_init(cs89x0_isa_init_module);
1831
1832static void __exit cs89x0_isa_cleanup_module(void)
1833{
1834 struct net_local *lp = netdev_priv(dev_cs89x0);
1835
1836 unregister_netdev(dev_cs89x0);
1837 iowrite16(PP_ChipID, lp->virt_addr + ADD_PORT);
1838 ioport_unmap(lp->virt_addr);
1839 release_region(dev_cs89x0->base_addr, NETCARD_IO_EXTENT);
1840 free_netdev(dev_cs89x0);
1841}
1842module_exit(cs89x0_isa_cleanup_module);
1843#endif /* MODULE */
1844#endif /* CONFIG_CS89x0_ISA */
1845
1846#if IS_ENABLED(CONFIG_CS89x0_PLATFORM)
1847static int __init cs89x0_platform_probe(struct platform_device *pdev)
1848{
1849 struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
1850 void __iomem *virt_addr;
1851 int err;
1852
1853 if (!dev)
1854 return -ENOMEM;
1855
1856 dev->irq = platform_get_irq(pdev, 0);
1857 if (dev->irq < 0) {
1858 err = dev->irq;
1859 goto free;
1860 }
1861
1862 virt_addr = devm_platform_ioremap_resource(pdev, 0);
1863 if (IS_ERR(virt_addr)) {
1864 err = PTR_ERR(virt_addr);
1865 goto free;
1866 }
1867
1868 err = cs89x0_probe1(dev, virt_addr, 0);
1869 if (err) {
1870 dev_warn(&dev->dev, "no cs8900 or cs8920 detected\n");
1871 goto free;
1872 }
1873
1874 platform_set_drvdata(pdev, dev);
1875 return 0;
1876
1877free:
1878 free_netdev(dev);
1879 return err;
1880}
1881
1882static void cs89x0_platform_remove(struct platform_device *pdev)
1883{
1884 struct net_device *dev = platform_get_drvdata(pdev);
1885
1886 /* This platform_get_resource() call will not return NULL, because
1887 * the same call in cs89x0_platform_probe() has returned a non NULL
1888 * value.
1889 */
1890 unregister_netdev(dev);
1891 free_netdev(dev);
1892}
1893
1894static const struct of_device_id __maybe_unused cs89x0_match[] = {
1895 { .compatible = "cirrus,cs8900", },
1896 { .compatible = "cirrus,cs8920", },
1897 { },
1898};
1899MODULE_DEVICE_TABLE(of, cs89x0_match);
1900
1901static struct platform_driver cs89x0_driver = {
1902 .driver = {
1903 .name = DRV_NAME,
1904 .of_match_table = of_match_ptr(cs89x0_match),
1905 },
1906 .remove = cs89x0_platform_remove,
1907};
1908
1909module_platform_driver_probe(cs89x0_driver, cs89x0_platform_probe);
1910
1911#endif /* CONFIG_CS89x0_PLATFORM */
1912
1913MODULE_LICENSE("GPL");
1914MODULE_DESCRIPTION("Crystal Semiconductor (Now Cirrus Logic) CS89[02]0 network driver");
1915MODULE_AUTHOR("Russell Nelson <nelson@crynwr.com>");
1/* cs89x0.c: A Crystal Semiconductor (Now Cirrus Logic) CS89[02]0
2 * driver for linux.
3 * Written 1996 by Russell Nelson, with reference to skeleton.c
4 * written 1993-1994 by Donald Becker.
5 *
6 * This software may be used and distributed according to the terms
7 * of the GNU General Public License, incorporated herein by reference.
8 *
9 * The author may be reached at nelson@crynwr.com, Crynwr
10 * Software, 521 Pleasant Valley Rd., Potsdam, NY 13676
11 *
12 * Other contributors:
13 * Mike Cruse : mcruse@cti-ltd.com
14 * Russ Nelson
15 * Melody Lee : ethernet@crystal.cirrus.com
16 * Alan Cox
17 * Andrew Morton
18 * Oskar Schirmer : oskar@scara.com
19 * Deepak Saxena : dsaxena@plexity.net
20 * Dmitry Pervushin : dpervushin@ru.mvista.com
21 * Deepak Saxena : dsaxena@plexity.net
22 * Domenico Andreoli : cavokz@gmail.com
23 */
24
25
26/*
27 * Set this to zero to disable DMA code
28 *
29 * Note that even if DMA is turned off we still support the 'dma' and 'use_dma'
30 * module options so we don't break any startup scripts.
31 */
32#ifndef CONFIG_ISA_DMA_API
33#define ALLOW_DMA 0
34#else
35#define ALLOW_DMA 1
36#endif
37
38/*
39 * Set this to zero to remove all the debug statements via
40 * dead code elimination
41 */
42#define DEBUGGING 1
43
44/* Sources:
45 * Crynwr packet driver epktisa.
46 * Crystal Semiconductor data sheets.
47 */
48
49#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
50
51#include <linux/module.h>
52#include <linux/printk.h>
53#include <linux/errno.h>
54#include <linux/netdevice.h>
55#include <linux/etherdevice.h>
56#include <linux/platform_device.h>
57#include <linux/kernel.h>
58#include <linux/types.h>
59#include <linux/fcntl.h>
60#include <linux/interrupt.h>
61#include <linux/ioport.h>
62#include <linux/in.h>
63#include <linux/jiffies.h>
64#include <linux/skbuff.h>
65#include <linux/spinlock.h>
66#include <linux/string.h>
67#include <linux/init.h>
68#include <linux/bitops.h>
69#include <linux/delay.h>
70#include <linux/gfp.h>
71#include <linux/io.h>
72
73#include <asm/irq.h>
74#include <linux/atomic.h>
75#if ALLOW_DMA
76#include <asm/dma.h>
77#endif
78
79#include "cs89x0.h"
80
81#define cs89_dbg(val, level, fmt, ...) \
82do { \
83 if (val <= net_debug) \
84 pr_##level(fmt, ##__VA_ARGS__); \
85} while (0)
86
87static char version[] __initdata =
88 "v2.4.3-pre1 Russell Nelson <nelson@crynwr.com>, Andrew Morton";
89
90#define DRV_NAME "cs89x0"
91
92/* First, a few definitions that the brave might change.
93 * A zero-terminated list of I/O addresses to be probed. Some special flags..
94 * Addr & 1 = Read back the address port, look for signature and reset
95 * the page window before probing
96 * Addr & 3 = Reset the page window and probe
97 * The CLPS eval board has the Cirrus chip at 0x80090300, in ARM IO space,
98 * but it is possible that a Cirrus board could be plugged into the ISA
99 * slots.
100 */
101/* The cs8900 has 4 IRQ pins, software selectable. cs8900_irq_map maps
102 * them to system IRQ numbers. This mapping is card specific and is set to
103 * the configuration of the Cirrus Eval board for this chip.
104 */
105#ifndef CONFIG_CS89x0_PLATFORM
106static unsigned int netcard_portlist[] __used __initdata = {
107 0x300, 0x320, 0x340, 0x360, 0x200, 0x220, 0x240,
108 0x260, 0x280, 0x2a0, 0x2c0, 0x2e0, 0
109};
110static unsigned int cs8900_irq_map[] = {
111 10, 11, 12, 5
112};
113#endif
114
115#if DEBUGGING
116static unsigned int net_debug = DEBUGGING;
117#else
118#define net_debug 0 /* gcc will remove all the debug code for us */
119#endif
120
121/* The number of low I/O ports used by the ethercard. */
122#define NETCARD_IO_EXTENT 16
123
124/* we allow the user to override various values normally set in the EEPROM */
125#define FORCE_RJ45 0x0001 /* pick one of these three */
126#define FORCE_AUI 0x0002
127#define FORCE_BNC 0x0004
128
129#define FORCE_AUTO 0x0010 /* pick one of these three */
130#define FORCE_HALF 0x0020
131#define FORCE_FULL 0x0030
132
133/* Information that need to be kept for each board. */
134struct net_local {
135 int chip_type; /* one of: CS8900, CS8920, CS8920M */
136 char chip_revision; /* revision letter of the chip ('A'...) */
137 int send_cmd; /* the proper send command: TX_NOW, TX_AFTER_381, or TX_AFTER_ALL */
138 int auto_neg_cnf; /* auto-negotiation word from EEPROM */
139 int adapter_cnf; /* adapter configuration from EEPROM */
140 int isa_config; /* ISA configuration from EEPROM */
141 int irq_map; /* IRQ map from EEPROM */
142 int rx_mode; /* what mode are we in? 0, RX_MULTCAST_ACCEPT, or RX_ALL_ACCEPT */
143 int curr_rx_cfg; /* a copy of PP_RxCFG */
144 int linectl; /* either 0 or LOW_RX_SQUELCH, depending on configuration. */
145 int send_underrun; /* keep track of how many underruns in a row we get */
146 int force; /* force various values; see FORCE* above. */
147 spinlock_t lock;
148 void __iomem *virt_addr;/* CS89x0 virtual address. */
149#if ALLOW_DMA
150 int use_dma; /* Flag: we're using dma */
151 int dma; /* DMA channel */
152 int dmasize; /* 16 or 64 */
153 unsigned char *dma_buff; /* points to the beginning of the buffer */
154 unsigned char *end_dma_buff; /* points to the end of the buffer */
155 unsigned char *rx_dma_ptr; /* points to the next packet */
156#endif
157};
158
159/* Example routines you must write ;->. */
160#define tx_done(dev) 1
161
162/*
163 * Permit 'cs89x0_dma=N' in the kernel boot environment
164 */
165#if !defined(MODULE)
166#if ALLOW_DMA
167static int g_cs89x0_dma;
168
169static int __init dma_fn(char *str)
170{
171 g_cs89x0_dma = simple_strtol(str, NULL, 0);
172 return 1;
173}
174
175__setup("cs89x0_dma=", dma_fn);
176#endif /* ALLOW_DMA */
177
178static int g_cs89x0_media__force;
179
180static int __init media_fn(char *str)
181{
182 if (!strcmp(str, "rj45"))
183 g_cs89x0_media__force = FORCE_RJ45;
184 else if (!strcmp(str, "aui"))
185 g_cs89x0_media__force = FORCE_AUI;
186 else if (!strcmp(str, "bnc"))
187 g_cs89x0_media__force = FORCE_BNC;
188
189 return 1;
190}
191
192__setup("cs89x0_media=", media_fn);
193#endif
194
195static void readwords(struct net_local *lp, int portno, void *buf, int length)
196{
197 u8 *buf8 = (u8 *)buf;
198
199 do {
200 u16 tmp16;
201
202 tmp16 = ioread16(lp->virt_addr + portno);
203 *buf8++ = (u8)tmp16;
204 *buf8++ = (u8)(tmp16 >> 8);
205 } while (--length);
206}
207
208static void writewords(struct net_local *lp, int portno, void *buf, int length)
209{
210 u8 *buf8 = (u8 *)buf;
211
212 do {
213 u16 tmp16;
214
215 tmp16 = *buf8++;
216 tmp16 |= (*buf8++) << 8;
217 iowrite16(tmp16, lp->virt_addr + portno);
218 } while (--length);
219}
220
221static u16
222readreg(struct net_device *dev, u16 regno)
223{
224 struct net_local *lp = netdev_priv(dev);
225
226 iowrite16(regno, lp->virt_addr + ADD_PORT);
227 return ioread16(lp->virt_addr + DATA_PORT);
228}
229
230static void
231writereg(struct net_device *dev, u16 regno, u16 value)
232{
233 struct net_local *lp = netdev_priv(dev);
234
235 iowrite16(regno, lp->virt_addr + ADD_PORT);
236 iowrite16(value, lp->virt_addr + DATA_PORT);
237}
238
239static int __init
240wait_eeprom_ready(struct net_device *dev)
241{
242 unsigned long timeout = jiffies;
243 /* check to see if the EEPROM is ready,
244 * a timeout is used just in case EEPROM is ready when
245 * SI_BUSY in the PP_SelfST is clear
246 */
247 while (readreg(dev, PP_SelfST) & SI_BUSY)
248 if (time_after_eq(jiffies, timeout + 40))
249 return -1;
250 return 0;
251}
252
253static int __init
254get_eeprom_data(struct net_device *dev, int off, int len, int *buffer)
255{
256 int i;
257
258 cs89_dbg(3, info, "EEPROM data from %x for %x:", off, len);
259 for (i = 0; i < len; i++) {
260 if (wait_eeprom_ready(dev) < 0)
261 return -1;
262 /* Now send the EEPROM read command and EEPROM location to read */
263 writereg(dev, PP_EECMD, (off + i) | EEPROM_READ_CMD);
264 if (wait_eeprom_ready(dev) < 0)
265 return -1;
266 buffer[i] = readreg(dev, PP_EEData);
267 cs89_dbg(3, cont, " %04x", buffer[i]);
268 }
269 cs89_dbg(3, cont, "\n");
270 return 0;
271}
272
273static int __init
274get_eeprom_cksum(int off, int len, int *buffer)
275{
276 int i, cksum;
277
278 cksum = 0;
279 for (i = 0; i < len; i++)
280 cksum += buffer[i];
281 cksum &= 0xffff;
282 if (cksum == 0)
283 return 0;
284 return -1;
285}
286
287static void
288write_irq(struct net_device *dev, int chip_type, int irq)
289{
290 int i;
291
292 if (chip_type == CS8900) {
293#ifndef CONFIG_CS89x0_PLATFORM
294 /* Search the mapping table for the corresponding IRQ pin. */
295 for (i = 0; i != ARRAY_SIZE(cs8900_irq_map); i++)
296 if (cs8900_irq_map[i] == irq)
297 break;
298 /* Not found */
299 if (i == ARRAY_SIZE(cs8900_irq_map))
300 i = 3;
301#else
302 /* INTRQ0 pin is used for interrupt generation. */
303 i = 0;
304#endif
305 writereg(dev, PP_CS8900_ISAINT, i);
306 } else {
307 writereg(dev, PP_CS8920_ISAINT, irq);
308 }
309}
310
311static void
312count_rx_errors(int status, struct net_device *dev)
313{
314 dev->stats.rx_errors++;
315 if (status & RX_RUNT)
316 dev->stats.rx_length_errors++;
317 if (status & RX_EXTRA_DATA)
318 dev->stats.rx_length_errors++;
319 if ((status & RX_CRC_ERROR) && !(status & (RX_EXTRA_DATA | RX_RUNT)))
320 /* per str 172 */
321 dev->stats.rx_crc_errors++;
322 if (status & RX_DRIBBLE)
323 dev->stats.rx_frame_errors++;
324}
325
326/*********************************
327 * This page contains DMA routines
328 *********************************/
329
330#if ALLOW_DMA
331
332#define dma_page_eq(ptr1, ptr2) ((long)(ptr1) >> 17 == (long)(ptr2) >> 17)
333
334static void
335get_dma_channel(struct net_device *dev)
336{
337 struct net_local *lp = netdev_priv(dev);
338
339 if (lp->dma) {
340 dev->dma = lp->dma;
341 lp->isa_config |= ISA_RxDMA;
342 } else {
343 if ((lp->isa_config & ANY_ISA_DMA) == 0)
344 return;
345 dev->dma = lp->isa_config & DMA_NO_MASK;
346 if (lp->chip_type == CS8900)
347 dev->dma += 5;
348 if (dev->dma < 5 || dev->dma > 7) {
349 lp->isa_config &= ~ANY_ISA_DMA;
350 return;
351 }
352 }
353}
354
355static void
356write_dma(struct net_device *dev, int chip_type, int dma)
357{
358 struct net_local *lp = netdev_priv(dev);
359 if ((lp->isa_config & ANY_ISA_DMA) == 0)
360 return;
361 if (chip_type == CS8900)
362 writereg(dev, PP_CS8900_ISADMA, dma - 5);
363 else
364 writereg(dev, PP_CS8920_ISADMA, dma);
365}
366
367static void
368set_dma_cfg(struct net_device *dev)
369{
370 struct net_local *lp = netdev_priv(dev);
371
372 if (lp->use_dma) {
373 if ((lp->isa_config & ANY_ISA_DMA) == 0) {
374 cs89_dbg(3, err, "set_dma_cfg(): no DMA\n");
375 return;
376 }
377 if (lp->isa_config & ISA_RxDMA) {
378 lp->curr_rx_cfg |= RX_DMA_ONLY;
379 cs89_dbg(3, info, "set_dma_cfg(): RX_DMA_ONLY\n");
380 } else {
381 lp->curr_rx_cfg |= AUTO_RX_DMA; /* not that we support it... */
382 cs89_dbg(3, info, "set_dma_cfg(): AUTO_RX_DMA\n");
383 }
384 }
385}
386
387static int
388dma_bufcfg(struct net_device *dev)
389{
390 struct net_local *lp = netdev_priv(dev);
391 if (lp->use_dma)
392 return (lp->isa_config & ANY_ISA_DMA) ? RX_DMA_ENBL : 0;
393 else
394 return 0;
395}
396
397static int
398dma_busctl(struct net_device *dev)
399{
400 int retval = 0;
401 struct net_local *lp = netdev_priv(dev);
402 if (lp->use_dma) {
403 if (lp->isa_config & ANY_ISA_DMA)
404 retval |= RESET_RX_DMA; /* Reset the DMA pointer */
405 if (lp->isa_config & DMA_BURST)
406 retval |= DMA_BURST_MODE; /* Does ISA config specify DMA burst ? */
407 if (lp->dmasize == 64)
408 retval |= RX_DMA_SIZE_64K; /* did they ask for 64K? */
409 retval |= MEMORY_ON; /* we need memory enabled to use DMA. */
410 }
411 return retval;
412}
413
414static void
415dma_rx(struct net_device *dev)
416{
417 struct net_local *lp = netdev_priv(dev);
418 struct sk_buff *skb;
419 int status, length;
420 unsigned char *bp = lp->rx_dma_ptr;
421
422 status = bp[0] + (bp[1] << 8);
423 length = bp[2] + (bp[3] << 8);
424 bp += 4;
425
426 cs89_dbg(5, debug, "%s: receiving DMA packet at %lx, status %x, length %x\n",
427 dev->name, (unsigned long)bp, status, length);
428
429 if ((status & RX_OK) == 0) {
430 count_rx_errors(status, dev);
431 goto skip_this_frame;
432 }
433
434 /* Malloc up new buffer. */
435 skb = netdev_alloc_skb(dev, length + 2);
436 if (skb == NULL) {
437 dev->stats.rx_dropped++;
438
439 /* AKPM: advance bp to the next frame */
440skip_this_frame:
441 bp += (length + 3) & ~3;
442 if (bp >= lp->end_dma_buff)
443 bp -= lp->dmasize * 1024;
444 lp->rx_dma_ptr = bp;
445 return;
446 }
447 skb_reserve(skb, 2); /* longword align L3 header */
448
449 if (bp + length > lp->end_dma_buff) {
450 int semi_cnt = lp->end_dma_buff - bp;
451 memcpy(skb_put(skb, semi_cnt), bp, semi_cnt);
452 memcpy(skb_put(skb, length - semi_cnt), lp->dma_buff,
453 length - semi_cnt);
454 } else {
455 memcpy(skb_put(skb, length), bp, length);
456 }
457 bp += (length + 3) & ~3;
458 if (bp >= lp->end_dma_buff)
459 bp -= lp->dmasize*1024;
460 lp->rx_dma_ptr = bp;
461
462 cs89_dbg(3, info, "%s: received %d byte DMA packet of type %x\n",
463 dev->name, length,
464 ((skb->data[ETH_ALEN + ETH_ALEN] << 8) |
465 skb->data[ETH_ALEN + ETH_ALEN + 1]));
466
467 skb->protocol = eth_type_trans(skb, dev);
468 netif_rx(skb);
469 dev->stats.rx_packets++;
470 dev->stats.rx_bytes += length;
471}
472
473static void release_dma_buff(struct net_local *lp)
474{
475 if (lp->dma_buff) {
476 free_pages((unsigned long)(lp->dma_buff),
477 get_order(lp->dmasize * 1024));
478 lp->dma_buff = NULL;
479 }
480}
481
482#endif /* ALLOW_DMA */
483
484static void
485control_dc_dc(struct net_device *dev, int on_not_off)
486{
487 struct net_local *lp = netdev_priv(dev);
488 unsigned int selfcontrol;
489 unsigned long timenow = jiffies;
490 /* control the DC to DC convertor in the SelfControl register.
491 * Note: This is hooked up to a general purpose pin, might not
492 * always be a DC to DC convertor.
493 */
494
495 selfcontrol = HCB1_ENBL; /* Enable the HCB1 bit as an output */
496 if (((lp->adapter_cnf & A_CNF_DC_DC_POLARITY) != 0) ^ on_not_off)
497 selfcontrol |= HCB1;
498 else
499 selfcontrol &= ~HCB1;
500 writereg(dev, PP_SelfCTL, selfcontrol);
501
502 /* Wait for the DC/DC converter to power up - 500ms */
503 while (time_before(jiffies, timenow + HZ))
504 ;
505}
506
507/* send a test packet - return true if carrier bits are ok */
508static int
509send_test_pkt(struct net_device *dev)
510{
511 struct net_local *lp = netdev_priv(dev);
512 char test_packet[] = {
513 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
514 0, 46, /* A 46 in network order */
515 0, 0, /* DSAP=0 & SSAP=0 fields */
516 0xf3, 0 /* Control (Test Req + P bit set) */
517 };
518 unsigned long timenow = jiffies;
519
520 writereg(dev, PP_LineCTL, readreg(dev, PP_LineCTL) | SERIAL_TX_ON);
521
522 memcpy(test_packet, dev->dev_addr, ETH_ALEN);
523 memcpy(test_packet + ETH_ALEN, dev->dev_addr, ETH_ALEN);
524
525 iowrite16(TX_AFTER_ALL, lp->virt_addr + TX_CMD_PORT);
526 iowrite16(ETH_ZLEN, lp->virt_addr + TX_LEN_PORT);
527
528 /* Test to see if the chip has allocated memory for the packet */
529 while (time_before(jiffies, timenow + 5))
530 if (readreg(dev, PP_BusST) & READY_FOR_TX_NOW)
531 break;
532 if (time_after_eq(jiffies, timenow + 5))
533 return 0; /* this shouldn't happen */
534
535 /* Write the contents of the packet */
536 writewords(lp, TX_FRAME_PORT, test_packet, (ETH_ZLEN + 1) >> 1);
537
538 cs89_dbg(1, debug, "Sending test packet ");
539 /* wait a couple of jiffies for packet to be received */
540 for (timenow = jiffies; time_before(jiffies, timenow + 3);)
541 ;
542 if ((readreg(dev, PP_TxEvent) & TX_SEND_OK_BITS) == TX_OK) {
543 cs89_dbg(1, cont, "succeeded\n");
544 return 1;
545 }
546 cs89_dbg(1, cont, "failed\n");
547 return 0;
548}
549
550#define DETECTED_NONE 0
551#define DETECTED_RJ45H 1
552#define DETECTED_RJ45F 2
553#define DETECTED_AUI 3
554#define DETECTED_BNC 4
555
556static int
557detect_tp(struct net_device *dev)
558{
559 struct net_local *lp = netdev_priv(dev);
560 unsigned long timenow = jiffies;
561 int fdx;
562
563 cs89_dbg(1, debug, "%s: Attempting TP\n", dev->name);
564
565 /* If connected to another full duplex capable 10-Base-T card
566 * the link pulses seem to be lost when the auto detect bit in
567 * the LineCTL is set. To overcome this the auto detect bit will
568 * be cleared whilst testing the 10-Base-T interface. This would
569 * not be necessary for the sparrow chip but is simpler to do it
570 * anyway.
571 */
572 writereg(dev, PP_LineCTL, lp->linectl & ~AUI_ONLY);
573 control_dc_dc(dev, 0);
574
575 /* Delay for the hardware to work out if the TP cable is present
576 * - 150ms
577 */
578 for (timenow = jiffies; time_before(jiffies, timenow + 15);)
579 ;
580 if ((readreg(dev, PP_LineST) & LINK_OK) == 0)
581 return DETECTED_NONE;
582
583 if (lp->chip_type == CS8900) {
584 switch (lp->force & 0xf0) {
585#if 0
586 case FORCE_AUTO:
587 pr_info("%s: cs8900 doesn't autonegotiate\n",
588 dev->name);
589 return DETECTED_NONE;
590#endif
591 /* CS8900 doesn't support AUTO, change to HALF*/
592 case FORCE_AUTO:
593 lp->force &= ~FORCE_AUTO;
594 lp->force |= FORCE_HALF;
595 break;
596 case FORCE_HALF:
597 break;
598 case FORCE_FULL:
599 writereg(dev, PP_TestCTL,
600 readreg(dev, PP_TestCTL) | FDX_8900);
601 break;
602 }
603 fdx = readreg(dev, PP_TestCTL) & FDX_8900;
604 } else {
605 switch (lp->force & 0xf0) {
606 case FORCE_AUTO:
607 lp->auto_neg_cnf = AUTO_NEG_ENABLE;
608 break;
609 case FORCE_HALF:
610 lp->auto_neg_cnf = 0;
611 break;
612 case FORCE_FULL:
613 lp->auto_neg_cnf = RE_NEG_NOW | ALLOW_FDX;
614 break;
615 }
616
617 writereg(dev, PP_AutoNegCTL, lp->auto_neg_cnf & AUTO_NEG_MASK);
618
619 if ((lp->auto_neg_cnf & AUTO_NEG_BITS) == AUTO_NEG_ENABLE) {
620 pr_info("%s: negotiating duplex...\n", dev->name);
621 while (readreg(dev, PP_AutoNegST) & AUTO_NEG_BUSY) {
622 if (time_after(jiffies, timenow + 4000)) {
623 pr_err("**** Full / half duplex auto-negotiation timed out ****\n");
624 break;
625 }
626 }
627 }
628 fdx = readreg(dev, PP_AutoNegST) & FDX_ACTIVE;
629 }
630 if (fdx)
631 return DETECTED_RJ45F;
632 else
633 return DETECTED_RJ45H;
634}
635
636static int
637detect_bnc(struct net_device *dev)
638{
639 struct net_local *lp = netdev_priv(dev);
640
641 cs89_dbg(1, debug, "%s: Attempting BNC\n", dev->name);
642 control_dc_dc(dev, 1);
643
644 writereg(dev, PP_LineCTL, (lp->linectl & ~AUTO_AUI_10BASET) | AUI_ONLY);
645
646 if (send_test_pkt(dev))
647 return DETECTED_BNC;
648 else
649 return DETECTED_NONE;
650}
651
652static int
653detect_aui(struct net_device *dev)
654{
655 struct net_local *lp = netdev_priv(dev);
656
657 cs89_dbg(1, debug, "%s: Attempting AUI\n", dev->name);
658 control_dc_dc(dev, 0);
659
660 writereg(dev, PP_LineCTL, (lp->linectl & ~AUTO_AUI_10BASET) | AUI_ONLY);
661
662 if (send_test_pkt(dev))
663 return DETECTED_AUI;
664 else
665 return DETECTED_NONE;
666}
667
668/* We have a good packet(s), get it/them out of the buffers. */
669static void
670net_rx(struct net_device *dev)
671{
672 struct net_local *lp = netdev_priv(dev);
673 struct sk_buff *skb;
674 int status, length;
675
676 status = ioread16(lp->virt_addr + RX_FRAME_PORT);
677 length = ioread16(lp->virt_addr + RX_FRAME_PORT);
678
679 if ((status & RX_OK) == 0) {
680 count_rx_errors(status, dev);
681 return;
682 }
683
684 /* Malloc up new buffer. */
685 skb = netdev_alloc_skb(dev, length + 2);
686 if (skb == NULL) {
687 dev->stats.rx_dropped++;
688 return;
689 }
690 skb_reserve(skb, 2); /* longword align L3 header */
691
692 readwords(lp, RX_FRAME_PORT, skb_put(skb, length), length >> 1);
693 if (length & 1)
694 skb->data[length-1] = ioread16(lp->virt_addr + RX_FRAME_PORT);
695
696 cs89_dbg(3, debug, "%s: received %d byte packet of type %x\n",
697 dev->name, length,
698 (skb->data[ETH_ALEN + ETH_ALEN] << 8) |
699 skb->data[ETH_ALEN + ETH_ALEN + 1]);
700
701 skb->protocol = eth_type_trans(skb, dev);
702 netif_rx(skb);
703 dev->stats.rx_packets++;
704 dev->stats.rx_bytes += length;
705}
706
707/* The typical workload of the driver:
708 * Handle the network interface interrupts.
709 */
710
711static irqreturn_t net_interrupt(int irq, void *dev_id)
712{
713 struct net_device *dev = dev_id;
714 struct net_local *lp;
715 int status;
716 int handled = 0;
717
718 lp = netdev_priv(dev);
719
720 /* we MUST read all the events out of the ISQ, otherwise we'll never
721 * get interrupted again. As a consequence, we can't have any limit
722 * on the number of times we loop in the interrupt handler. The
723 * hardware guarantees that eventually we'll run out of events. Of
724 * course, if you're on a slow machine, and packets are arriving
725 * faster than you can read them off, you're screwed. Hasta la
726 * vista, baby!
727 */
728 while ((status = ioread16(lp->virt_addr + ISQ_PORT))) {
729 cs89_dbg(4, debug, "%s: event=%04x\n", dev->name, status);
730 handled = 1;
731 switch (status & ISQ_EVENT_MASK) {
732 case ISQ_RECEIVER_EVENT:
733 /* Got a packet(s). */
734 net_rx(dev);
735 break;
736 case ISQ_TRANSMITTER_EVENT:
737 dev->stats.tx_packets++;
738 netif_wake_queue(dev); /* Inform upper layers. */
739 if ((status & (TX_OK |
740 TX_LOST_CRS |
741 TX_SQE_ERROR |
742 TX_LATE_COL |
743 TX_16_COL)) != TX_OK) {
744 if ((status & TX_OK) == 0)
745 dev->stats.tx_errors++;
746 if (status & TX_LOST_CRS)
747 dev->stats.tx_carrier_errors++;
748 if (status & TX_SQE_ERROR)
749 dev->stats.tx_heartbeat_errors++;
750 if (status & TX_LATE_COL)
751 dev->stats.tx_window_errors++;
752 if (status & TX_16_COL)
753 dev->stats.tx_aborted_errors++;
754 }
755 break;
756 case ISQ_BUFFER_EVENT:
757 if (status & READY_FOR_TX) {
758 /* we tried to transmit a packet earlier,
759 * but inexplicably ran out of buffers.
760 * That shouldn't happen since we only ever
761 * load one packet. Shrug. Do the right
762 * thing anyway.
763 */
764 netif_wake_queue(dev); /* Inform upper layers. */
765 }
766 if (status & TX_UNDERRUN) {
767 cs89_dbg(0, err, "%s: transmit underrun\n",
768 dev->name);
769 lp->send_underrun++;
770 if (lp->send_underrun == 3)
771 lp->send_cmd = TX_AFTER_381;
772 else if (lp->send_underrun == 6)
773 lp->send_cmd = TX_AFTER_ALL;
774 /* transmit cycle is done, although
775 * frame wasn't transmitted - this
776 * avoids having to wait for the upper
777 * layers to timeout on us, in the
778 * event of a tx underrun
779 */
780 netif_wake_queue(dev); /* Inform upper layers. */
781 }
782#if ALLOW_DMA
783 if (lp->use_dma && (status & RX_DMA)) {
784 int count = readreg(dev, PP_DmaFrameCnt);
785 while (count) {
786 cs89_dbg(5, debug,
787 "%s: receiving %d DMA frames\n",
788 dev->name, count);
789 if (count > 1)
790 cs89_dbg(2, debug,
791 "%s: receiving %d DMA frames\n",
792 dev->name, count);
793 dma_rx(dev);
794 if (--count == 0)
795 count = readreg(dev, PP_DmaFrameCnt);
796 if (count > 0)
797 cs89_dbg(2, debug,
798 "%s: continuing with %d DMA frames\n",
799 dev->name, count);
800 }
801 }
802#endif
803 break;
804 case ISQ_RX_MISS_EVENT:
805 dev->stats.rx_missed_errors += (status >> 6);
806 break;
807 case ISQ_TX_COL_EVENT:
808 dev->stats.collisions += (status >> 6);
809 break;
810 }
811 }
812 return IRQ_RETVAL(handled);
813}
814
815/* Open/initialize the board. This is called (in the current kernel)
816 sometime after booting when the 'ifconfig' program is run.
817
818 This routine should set everything up anew at each open, even
819 registers that "should" only need to be set once at boot, so that
820 there is non-reboot way to recover if something goes wrong.
821*/
822
823/* AKPM: do we need to do any locking here? */
824
825static int
826net_open(struct net_device *dev)
827{
828 struct net_local *lp = netdev_priv(dev);
829 int result = 0;
830 int i;
831 int ret;
832
833 if (dev->irq < 2) {
834 /* Allow interrupts to be generated by the chip */
835/* Cirrus' release had this: */
836#if 0
837 writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) | ENABLE_IRQ);
838#endif
839/* And 2.3.47 had this: */
840 writereg(dev, PP_BusCTL, ENABLE_IRQ | MEMORY_ON);
841
842 for (i = 2; i < CS8920_NO_INTS; i++) {
843 if ((1 << i) & lp->irq_map) {
844 if (request_irq(i, net_interrupt, 0, dev->name,
845 dev) == 0) {
846 dev->irq = i;
847 write_irq(dev, lp->chip_type, i);
848 /* writereg(dev, PP_BufCFG, GENERATE_SW_INTERRUPT); */
849 break;
850 }
851 }
852 }
853
854 if (i >= CS8920_NO_INTS) {
855 writereg(dev, PP_BusCTL, 0); /* disable interrupts. */
856 pr_err("can't get an interrupt\n");
857 ret = -EAGAIN;
858 goto bad_out;
859 }
860 } else {
861#if !defined(CONFIG_CS89x0_PLATFORM)
862 if (((1 << dev->irq) & lp->irq_map) == 0) {
863 pr_err("%s: IRQ %d is not in our map of allowable IRQs, which is %x\n",
864 dev->name, dev->irq, lp->irq_map);
865 ret = -EAGAIN;
866 goto bad_out;
867 }
868#endif
869/* FIXME: Cirrus' release had this: */
870 writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL)|ENABLE_IRQ);
871/* And 2.3.47 had this: */
872#if 0
873 writereg(dev, PP_BusCTL, ENABLE_IRQ | MEMORY_ON);
874#endif
875 write_irq(dev, lp->chip_type, dev->irq);
876 ret = request_irq(dev->irq, net_interrupt, 0, dev->name, dev);
877 if (ret) {
878 pr_err("request_irq(%d) failed\n", dev->irq);
879 goto bad_out;
880 }
881 }
882
883#if ALLOW_DMA
884 if (lp->use_dma && (lp->isa_config & ANY_ISA_DMA)) {
885 unsigned long flags;
886 lp->dma_buff = (unsigned char *)__get_dma_pages(GFP_KERNEL,
887 get_order(lp->dmasize * 1024));
888 if (!lp->dma_buff) {
889 pr_err("%s: cannot get %dK memory for DMA\n",
890 dev->name, lp->dmasize);
891 goto release_irq;
892 }
893 cs89_dbg(1, debug, "%s: dma %lx %lx\n",
894 dev->name,
895 (unsigned long)lp->dma_buff,
896 (unsigned long)isa_virt_to_bus(lp->dma_buff));
897 if ((unsigned long)lp->dma_buff >= MAX_DMA_ADDRESS ||
898 !dma_page_eq(lp->dma_buff,
899 lp->dma_buff + lp->dmasize * 1024 - 1)) {
900 pr_err("%s: not usable as DMA buffer\n", dev->name);
901 goto release_irq;
902 }
903 memset(lp->dma_buff, 0, lp->dmasize * 1024); /* Why? */
904 if (request_dma(dev->dma, dev->name)) {
905 pr_err("%s: cannot get dma channel %d\n",
906 dev->name, dev->dma);
907 goto release_irq;
908 }
909 write_dma(dev, lp->chip_type, dev->dma);
910 lp->rx_dma_ptr = lp->dma_buff;
911 lp->end_dma_buff = lp->dma_buff + lp->dmasize * 1024;
912 spin_lock_irqsave(&lp->lock, flags);
913 disable_dma(dev->dma);
914 clear_dma_ff(dev->dma);
915 set_dma_mode(dev->dma, DMA_RX_MODE); /* auto_init as well */
916 set_dma_addr(dev->dma, isa_virt_to_bus(lp->dma_buff));
917 set_dma_count(dev->dma, lp->dmasize * 1024);
918 enable_dma(dev->dma);
919 spin_unlock_irqrestore(&lp->lock, flags);
920 }
921#endif /* ALLOW_DMA */
922
923 /* set the Ethernet address */
924 for (i = 0; i < ETH_ALEN / 2; i++)
925 writereg(dev, PP_IA + i * 2,
926 (dev->dev_addr[i * 2] |
927 (dev->dev_addr[i * 2 + 1] << 8)));
928
929 /* while we're testing the interface, leave interrupts disabled */
930 writereg(dev, PP_BusCTL, MEMORY_ON);
931
932 /* Set the LineCTL quintuplet based on adapter configuration read from EEPROM */
933 if ((lp->adapter_cnf & A_CNF_EXTND_10B_2) &&
934 (lp->adapter_cnf & A_CNF_LOW_RX_SQUELCH))
935 lp->linectl = LOW_RX_SQUELCH;
936 else
937 lp->linectl = 0;
938
939 /* check to make sure that they have the "right" hardware available */
940 switch (lp->adapter_cnf & A_CNF_MEDIA_TYPE) {
941 case A_CNF_MEDIA_10B_T:
942 result = lp->adapter_cnf & A_CNF_10B_T;
943 break;
944 case A_CNF_MEDIA_AUI:
945 result = lp->adapter_cnf & A_CNF_AUI;
946 break;
947 case A_CNF_MEDIA_10B_2:
948 result = lp->adapter_cnf & A_CNF_10B_2;
949 break;
950 default:
951 result = lp->adapter_cnf & (A_CNF_10B_T |
952 A_CNF_AUI |
953 A_CNF_10B_2);
954 }
955 if (!result) {
956 pr_err("%s: EEPROM is configured for unavailable media\n",
957 dev->name);
958release_dma:
959#if ALLOW_DMA
960 free_dma(dev->dma);
961release_irq:
962 release_dma_buff(lp);
963#endif
964 writereg(dev, PP_LineCTL,
965 readreg(dev, PP_LineCTL) & ~(SERIAL_TX_ON | SERIAL_RX_ON));
966 free_irq(dev->irq, dev);
967 ret = -EAGAIN;
968 goto bad_out;
969 }
970
971 /* set the hardware to the configured choice */
972 switch (lp->adapter_cnf & A_CNF_MEDIA_TYPE) {
973 case A_CNF_MEDIA_10B_T:
974 result = detect_tp(dev);
975 if (result == DETECTED_NONE) {
976 pr_warn("%s: 10Base-T (RJ-45) has no cable\n",
977 dev->name);
978 if (lp->auto_neg_cnf & IMM_BIT) /* check "ignore missing media" bit */
979 result = DETECTED_RJ45H; /* Yes! I don't care if I see a link pulse */
980 }
981 break;
982 case A_CNF_MEDIA_AUI:
983 result = detect_aui(dev);
984 if (result == DETECTED_NONE) {
985 pr_warn("%s: 10Base-5 (AUI) has no cable\n", dev->name);
986 if (lp->auto_neg_cnf & IMM_BIT) /* check "ignore missing media" bit */
987 result = DETECTED_AUI; /* Yes! I don't care if I see a carrrier */
988 }
989 break;
990 case A_CNF_MEDIA_10B_2:
991 result = detect_bnc(dev);
992 if (result == DETECTED_NONE) {
993 pr_warn("%s: 10Base-2 (BNC) has no cable\n", dev->name);
994 if (lp->auto_neg_cnf & IMM_BIT) /* check "ignore missing media" bit */
995 result = DETECTED_BNC; /* Yes! I don't care if I can xmit a packet */
996 }
997 break;
998 case A_CNF_MEDIA_AUTO:
999 writereg(dev, PP_LineCTL, lp->linectl | AUTO_AUI_10BASET);
1000 if (lp->adapter_cnf & A_CNF_10B_T) {
1001 result = detect_tp(dev);
1002 if (result != DETECTED_NONE)
1003 break;
1004 }
1005 if (lp->adapter_cnf & A_CNF_AUI) {
1006 result = detect_aui(dev);
1007 if (result != DETECTED_NONE)
1008 break;
1009 }
1010 if (lp->adapter_cnf & A_CNF_10B_2) {
1011 result = detect_bnc(dev);
1012 if (result != DETECTED_NONE)
1013 break;
1014 }
1015 pr_err("%s: no media detected\n", dev->name);
1016 goto release_dma;
1017 }
1018 switch (result) {
1019 case DETECTED_NONE:
1020 pr_err("%s: no network cable attached to configured media\n",
1021 dev->name);
1022 goto release_dma;
1023 case DETECTED_RJ45H:
1024 pr_info("%s: using half-duplex 10Base-T (RJ-45)\n", dev->name);
1025 break;
1026 case DETECTED_RJ45F:
1027 pr_info("%s: using full-duplex 10Base-T (RJ-45)\n", dev->name);
1028 break;
1029 case DETECTED_AUI:
1030 pr_info("%s: using 10Base-5 (AUI)\n", dev->name);
1031 break;
1032 case DETECTED_BNC:
1033 pr_info("%s: using 10Base-2 (BNC)\n", dev->name);
1034 break;
1035 }
1036
1037 /* Turn on both receive and transmit operations */
1038 writereg(dev, PP_LineCTL,
1039 readreg(dev, PP_LineCTL) | SERIAL_RX_ON | SERIAL_TX_ON);
1040
1041 /* Receive only error free packets addressed to this card */
1042 lp->rx_mode = 0;
1043 writereg(dev, PP_RxCTL, DEF_RX_ACCEPT);
1044
1045 lp->curr_rx_cfg = RX_OK_ENBL | RX_CRC_ERROR_ENBL;
1046
1047 if (lp->isa_config & STREAM_TRANSFER)
1048 lp->curr_rx_cfg |= RX_STREAM_ENBL;
1049#if ALLOW_DMA
1050 set_dma_cfg(dev);
1051#endif
1052 writereg(dev, PP_RxCFG, lp->curr_rx_cfg);
1053
1054 writereg(dev, PP_TxCFG, (TX_LOST_CRS_ENBL |
1055 TX_SQE_ERROR_ENBL |
1056 TX_OK_ENBL |
1057 TX_LATE_COL_ENBL |
1058 TX_JBR_ENBL |
1059 TX_ANY_COL_ENBL |
1060 TX_16_COL_ENBL));
1061
1062 writereg(dev, PP_BufCFG, (READY_FOR_TX_ENBL |
1063 RX_MISS_COUNT_OVRFLOW_ENBL |
1064#if ALLOW_DMA
1065 dma_bufcfg(dev) |
1066#endif
1067 TX_COL_COUNT_OVRFLOW_ENBL |
1068 TX_UNDERRUN_ENBL));
1069
1070 /* now that we've got our act together, enable everything */
1071 writereg(dev, PP_BusCTL, (ENABLE_IRQ
1072 | (dev->mem_start ? MEMORY_ON : 0) /* turn memory on */
1073#if ALLOW_DMA
1074 | dma_busctl(dev)
1075#endif
1076 ));
1077 netif_start_queue(dev);
1078 cs89_dbg(1, debug, "net_open() succeeded\n");
1079 return 0;
1080bad_out:
1081 return ret;
1082}
1083
1084/* The inverse routine to net_open(). */
1085static int
1086net_close(struct net_device *dev)
1087{
1088#if ALLOW_DMA
1089 struct net_local *lp = netdev_priv(dev);
1090#endif
1091
1092 netif_stop_queue(dev);
1093
1094 writereg(dev, PP_RxCFG, 0);
1095 writereg(dev, PP_TxCFG, 0);
1096 writereg(dev, PP_BufCFG, 0);
1097 writereg(dev, PP_BusCTL, 0);
1098
1099 free_irq(dev->irq, dev);
1100
1101#if ALLOW_DMA
1102 if (lp->use_dma && lp->dma) {
1103 free_dma(dev->dma);
1104 release_dma_buff(lp);
1105 }
1106#endif
1107
1108 /* Update the statistics here. */
1109 return 0;
1110}
1111
1112/* Get the current statistics.
1113 * This may be called with the card open or closed.
1114 */
1115static struct net_device_stats *
1116net_get_stats(struct net_device *dev)
1117{
1118 struct net_local *lp = netdev_priv(dev);
1119 unsigned long flags;
1120
1121 spin_lock_irqsave(&lp->lock, flags);
1122 /* Update the statistics from the device registers. */
1123 dev->stats.rx_missed_errors += (readreg(dev, PP_RxMiss) >> 6);
1124 dev->stats.collisions += (readreg(dev, PP_TxCol) >> 6);
1125 spin_unlock_irqrestore(&lp->lock, flags);
1126
1127 return &dev->stats;
1128}
1129
1130static void net_timeout(struct net_device *dev)
1131{
1132 /* If we get here, some higher level has decided we are broken.
1133 There should really be a "kick me" function call instead. */
1134 cs89_dbg(0, err, "%s: transmit timed out, %s?\n",
1135 dev->name,
1136 tx_done(dev) ? "IRQ conflict" : "network cable problem");
1137 /* Try to restart the adaptor. */
1138 netif_wake_queue(dev);
1139}
1140
1141static netdev_tx_t net_send_packet(struct sk_buff *skb, struct net_device *dev)
1142{
1143 struct net_local *lp = netdev_priv(dev);
1144 unsigned long flags;
1145
1146 cs89_dbg(3, debug, "%s: sent %d byte packet of type %x\n",
1147 dev->name, skb->len,
1148 ((skb->data[ETH_ALEN + ETH_ALEN] << 8) |
1149 skb->data[ETH_ALEN + ETH_ALEN + 1]));
1150
1151 /* keep the upload from being interrupted, since we
1152 * ask the chip to start transmitting before the
1153 * whole packet has been completely uploaded.
1154 */
1155
1156 spin_lock_irqsave(&lp->lock, flags);
1157 netif_stop_queue(dev);
1158
1159 /* initiate a transmit sequence */
1160 iowrite16(lp->send_cmd, lp->virt_addr + TX_CMD_PORT);
1161 iowrite16(skb->len, lp->virt_addr + TX_LEN_PORT);
1162
1163 /* Test to see if the chip has allocated memory for the packet */
1164 if ((readreg(dev, PP_BusST) & READY_FOR_TX_NOW) == 0) {
1165 /* Gasp! It hasn't. But that shouldn't happen since
1166 * we're waiting for TxOk, so return 1 and requeue this packet.
1167 */
1168
1169 spin_unlock_irqrestore(&lp->lock, flags);
1170 cs89_dbg(0, err, "Tx buffer not free!\n");
1171 return NETDEV_TX_BUSY;
1172 }
1173 /* Write the contents of the packet */
1174 writewords(lp, TX_FRAME_PORT, skb->data, (skb->len + 1) >> 1);
1175 spin_unlock_irqrestore(&lp->lock, flags);
1176 dev->stats.tx_bytes += skb->len;
1177 dev_consume_skb_any(skb);
1178
1179 /* We DO NOT call netif_wake_queue() here.
1180 * We also DO NOT call netif_start_queue().
1181 *
1182 * Either of these would cause another bottom half run through
1183 * net_send_packet() before this packet has fully gone out.
1184 * That causes us to hit the "Gasp!" above and the send is rescheduled.
1185 * it runs like a dog. We just return and wait for the Tx completion
1186 * interrupt handler to restart the netdevice layer
1187 */
1188
1189 return NETDEV_TX_OK;
1190}
1191
1192static void set_multicast_list(struct net_device *dev)
1193{
1194 struct net_local *lp = netdev_priv(dev);
1195 unsigned long flags;
1196 u16 cfg;
1197
1198 spin_lock_irqsave(&lp->lock, flags);
1199 if (dev->flags & IFF_PROMISC)
1200 lp->rx_mode = RX_ALL_ACCEPT;
1201 else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev))
1202 /* The multicast-accept list is initialized to accept-all,
1203 * and we rely on higher-level filtering for now.
1204 */
1205 lp->rx_mode = RX_MULTCAST_ACCEPT;
1206 else
1207 lp->rx_mode = 0;
1208
1209 writereg(dev, PP_RxCTL, DEF_RX_ACCEPT | lp->rx_mode);
1210
1211 /* in promiscuous mode, we accept errored packets,
1212 * so we have to enable interrupts on them also
1213 */
1214 cfg = lp->curr_rx_cfg;
1215 if (lp->rx_mode == RX_ALL_ACCEPT)
1216 cfg |= RX_CRC_ERROR_ENBL | RX_RUNT_ENBL | RX_EXTRA_DATA_ENBL;
1217 writereg(dev, PP_RxCFG, cfg);
1218 spin_unlock_irqrestore(&lp->lock, flags);
1219}
1220
1221static int set_mac_address(struct net_device *dev, void *p)
1222{
1223 int i;
1224 struct sockaddr *addr = p;
1225
1226 if (netif_running(dev))
1227 return -EBUSY;
1228
1229 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1230
1231 cs89_dbg(0, debug, "%s: Setting MAC address to %pM\n",
1232 dev->name, dev->dev_addr);
1233
1234 /* set the Ethernet address */
1235 for (i = 0; i < ETH_ALEN / 2; i++)
1236 writereg(dev, PP_IA + i * 2,
1237 (dev->dev_addr[i * 2] |
1238 (dev->dev_addr[i * 2 + 1] << 8)));
1239
1240 return 0;
1241}
1242
1243#ifdef CONFIG_NET_POLL_CONTROLLER
1244/*
1245 * Polling receive - used by netconsole and other diagnostic tools
1246 * to allow network i/o with interrupts disabled.
1247 */
1248static void net_poll_controller(struct net_device *dev)
1249{
1250 disable_irq(dev->irq);
1251 net_interrupt(dev->irq, dev);
1252 enable_irq(dev->irq);
1253}
1254#endif
1255
1256static const struct net_device_ops net_ops = {
1257 .ndo_open = net_open,
1258 .ndo_stop = net_close,
1259 .ndo_tx_timeout = net_timeout,
1260 .ndo_start_xmit = net_send_packet,
1261 .ndo_get_stats = net_get_stats,
1262 .ndo_set_rx_mode = set_multicast_list,
1263 .ndo_set_mac_address = set_mac_address,
1264#ifdef CONFIG_NET_POLL_CONTROLLER
1265 .ndo_poll_controller = net_poll_controller,
1266#endif
1267 .ndo_change_mtu = eth_change_mtu,
1268 .ndo_validate_addr = eth_validate_addr,
1269};
1270
1271static void __init reset_chip(struct net_device *dev)
1272{
1273#if !defined(CONFIG_MACH_MX31ADS)
1274 struct net_local *lp = netdev_priv(dev);
1275 unsigned long reset_start_time;
1276
1277 writereg(dev, PP_SelfCTL, readreg(dev, PP_SelfCTL) | POWER_ON_RESET);
1278
1279 /* wait 30 ms */
1280 msleep(30);
1281
1282 if (lp->chip_type != CS8900) {
1283 /* Hardware problem requires PNP registers to be reconfigured after a reset */
1284 iowrite16(PP_CS8920_ISAINT, lp->virt_addr + ADD_PORT);
1285 iowrite8(dev->irq, lp->virt_addr + DATA_PORT);
1286 iowrite8(0, lp->virt_addr + DATA_PORT + 1);
1287
1288 iowrite16(PP_CS8920_ISAMemB, lp->virt_addr + ADD_PORT);
1289 iowrite8((dev->mem_start >> 16) & 0xff,
1290 lp->virt_addr + DATA_PORT);
1291 iowrite8((dev->mem_start >> 8) & 0xff,
1292 lp->virt_addr + DATA_PORT + 1);
1293 }
1294
1295 /* Wait until the chip is reset */
1296 reset_start_time = jiffies;
1297 while ((readreg(dev, PP_SelfST) & INIT_DONE) == 0 &&
1298 time_before(jiffies, reset_start_time + 2))
1299 ;
1300#endif /* !CONFIG_MACH_MX31ADS */
1301}
1302
1303/* This is the real probe routine.
1304 * Linux has a history of friendly device probes on the ISA bus.
1305 * A good device probes avoids doing writes, and
1306 * verifies that the correct device exists and functions.
1307 * Return 0 on success.
1308 */
1309static int __init
1310cs89x0_probe1(struct net_device *dev, void __iomem *ioaddr, int modular)
1311{
1312 struct net_local *lp = netdev_priv(dev);
1313 int i;
1314 int tmp;
1315 unsigned rev_type = 0;
1316 int eeprom_buff[CHKSUM_LEN];
1317 int retval;
1318
1319 /* Initialize the device structure. */
1320 if (!modular) {
1321 memset(lp, 0, sizeof(*lp));
1322 spin_lock_init(&lp->lock);
1323#ifndef MODULE
1324#if ALLOW_DMA
1325 if (g_cs89x0_dma) {
1326 lp->use_dma = 1;
1327 lp->dma = g_cs89x0_dma;
1328 lp->dmasize = 16; /* Could make this an option... */
1329 }
1330#endif
1331 lp->force = g_cs89x0_media__force;
1332#endif
1333 }
1334
1335 pr_debug("PP_addr at %p[%x]: 0x%x\n",
1336 ioaddr, ADD_PORT, ioread16(ioaddr + ADD_PORT));
1337 iowrite16(PP_ChipID, ioaddr + ADD_PORT);
1338
1339 tmp = ioread16(ioaddr + DATA_PORT);
1340 if (tmp != CHIP_EISA_ID_SIG) {
1341 pr_debug("%s: incorrect signature at %p[%x]: 0x%x!="
1342 CHIP_EISA_ID_SIG_STR "\n",
1343 dev->name, ioaddr, DATA_PORT, tmp);
1344 retval = -ENODEV;
1345 goto out1;
1346 }
1347
1348 lp->virt_addr = ioaddr;
1349
1350 /* get the chip type */
1351 rev_type = readreg(dev, PRODUCT_ID_ADD);
1352 lp->chip_type = rev_type & ~REVISON_BITS;
1353 lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';
1354
1355 /* Check the chip type and revision in order to set the correct
1356 * send command. CS8920 revision C and CS8900 revision F can use
1357 * the faster send.
1358 */
1359 lp->send_cmd = TX_AFTER_381;
1360 if (lp->chip_type == CS8900 && lp->chip_revision >= 'F')
1361 lp->send_cmd = TX_NOW;
1362 if (lp->chip_type != CS8900 && lp->chip_revision >= 'C')
1363 lp->send_cmd = TX_NOW;
1364
1365 pr_info_once("%s\n", version);
1366
1367 pr_info("%s: cs89%c0%s rev %c found at %p ",
1368 dev->name,
1369 lp->chip_type == CS8900 ? '0' : '2',
1370 lp->chip_type == CS8920M ? "M" : "",
1371 lp->chip_revision,
1372 lp->virt_addr);
1373
1374 reset_chip(dev);
1375
1376 /* Here we read the current configuration of the chip.
1377 * If there is no Extended EEPROM then the idea is to not disturb
1378 * the chip configuration, it should have been correctly setup by
1379 * automatic EEPROM read on reset. So, if the chip says it read
1380 * the EEPROM the driver will always do *something* instead of
1381 * complain that adapter_cnf is 0.
1382 */
1383
1384 if ((readreg(dev, PP_SelfST) & (EEPROM_OK | EEPROM_PRESENT)) ==
1385 (EEPROM_OK | EEPROM_PRESENT)) {
1386 /* Load the MAC. */
1387 for (i = 0; i < ETH_ALEN / 2; i++) {
1388 unsigned int Addr;
1389 Addr = readreg(dev, PP_IA + i * 2);
1390 dev->dev_addr[i * 2] = Addr & 0xFF;
1391 dev->dev_addr[i * 2 + 1] = Addr >> 8;
1392 }
1393
1394 /* Load the Adapter Configuration.
1395 * Note: Barring any more specific information from some
1396 * other source (ie EEPROM+Schematics), we would not know
1397 * how to operate a 10Base2 interface on the AUI port.
1398 * However, since we do read the status of HCB1 and use
1399 * settings that always result in calls to control_dc_dc(dev,0)
1400 * a BNC interface should work if the enable pin
1401 * (dc/dc converter) is on HCB1.
1402 * It will be called AUI however.
1403 */
1404
1405 lp->adapter_cnf = 0;
1406 i = readreg(dev, PP_LineCTL);
1407 /* Preserve the setting of the HCB1 pin. */
1408 if ((i & (HCB1 | HCB1_ENBL)) == (HCB1 | HCB1_ENBL))
1409 lp->adapter_cnf |= A_CNF_DC_DC_POLARITY;
1410 /* Save the sqelch bit */
1411 if ((i & LOW_RX_SQUELCH) == LOW_RX_SQUELCH)
1412 lp->adapter_cnf |= A_CNF_EXTND_10B_2 | A_CNF_LOW_RX_SQUELCH;
1413 /* Check if the card is in 10Base-t only mode */
1414 if ((i & (AUI_ONLY | AUTO_AUI_10BASET)) == 0)
1415 lp->adapter_cnf |= A_CNF_10B_T | A_CNF_MEDIA_10B_T;
1416 /* Check if the card is in AUI only mode */
1417 if ((i & (AUI_ONLY | AUTO_AUI_10BASET)) == AUI_ONLY)
1418 lp->adapter_cnf |= A_CNF_AUI | A_CNF_MEDIA_AUI;
1419 /* Check if the card is in Auto mode. */
1420 if ((i & (AUI_ONLY | AUTO_AUI_10BASET)) == AUTO_AUI_10BASET)
1421 lp->adapter_cnf |= A_CNF_AUI | A_CNF_10B_T |
1422 A_CNF_MEDIA_AUI | A_CNF_MEDIA_10B_T | A_CNF_MEDIA_AUTO;
1423
1424 cs89_dbg(1, info, "%s: PP_LineCTL=0x%x, adapter_cnf=0x%x\n",
1425 dev->name, i, lp->adapter_cnf);
1426
1427 /* IRQ. Other chips already probe, see below. */
1428 if (lp->chip_type == CS8900)
1429 lp->isa_config = readreg(dev, PP_CS8900_ISAINT) & INT_NO_MASK;
1430
1431 pr_cont("[Cirrus EEPROM] ");
1432 }
1433
1434 pr_cont("\n");
1435
1436 /* First check to see if an EEPROM is attached. */
1437
1438 if ((readreg(dev, PP_SelfST) & EEPROM_PRESENT) == 0)
1439 pr_warn("No EEPROM, relying on command line....\n");
1440 else if (get_eeprom_data(dev, START_EEPROM_DATA, CHKSUM_LEN, eeprom_buff) < 0) {
1441 pr_warn("EEPROM read failed, relying on command line\n");
1442 } else if (get_eeprom_cksum(START_EEPROM_DATA, CHKSUM_LEN, eeprom_buff) < 0) {
1443 /* Check if the chip was able to read its own configuration starting
1444 at 0 in the EEPROM*/
1445 if ((readreg(dev, PP_SelfST) & (EEPROM_OK | EEPROM_PRESENT)) !=
1446 (EEPROM_OK | EEPROM_PRESENT))
1447 pr_warn("Extended EEPROM checksum bad and no Cirrus EEPROM, relying on command line\n");
1448
1449 } else {
1450 /* This reads an extended EEPROM that is not documented
1451 * in the CS8900 datasheet.
1452 */
1453
1454 /* get transmission control word but keep the autonegotiation bits */
1455 if (!lp->auto_neg_cnf)
1456 lp->auto_neg_cnf = eeprom_buff[AUTO_NEG_CNF_OFFSET / 2];
1457 /* Store adapter configuration */
1458 if (!lp->adapter_cnf)
1459 lp->adapter_cnf = eeprom_buff[ADAPTER_CNF_OFFSET / 2];
1460 /* Store ISA configuration */
1461 lp->isa_config = eeprom_buff[ISA_CNF_OFFSET / 2];
1462 dev->mem_start = eeprom_buff[PACKET_PAGE_OFFSET / 2] << 8;
1463
1464 /* eeprom_buff has 32-bit ints, so we can't just memcpy it */
1465 /* store the initial memory base address */
1466 for (i = 0; i < ETH_ALEN / 2; i++) {
1467 dev->dev_addr[i * 2] = eeprom_buff[i];
1468 dev->dev_addr[i * 2 + 1] = eeprom_buff[i] >> 8;
1469 }
1470 cs89_dbg(1, debug, "%s: new adapter_cnf: 0x%x\n",
1471 dev->name, lp->adapter_cnf);
1472 }
1473
1474 /* allow them to force multiple transceivers. If they force multiple, autosense */
1475 {
1476 int count = 0;
1477 if (lp->force & FORCE_RJ45) {
1478 lp->adapter_cnf |= A_CNF_10B_T;
1479 count++;
1480 }
1481 if (lp->force & FORCE_AUI) {
1482 lp->adapter_cnf |= A_CNF_AUI;
1483 count++;
1484 }
1485 if (lp->force & FORCE_BNC) {
1486 lp->adapter_cnf |= A_CNF_10B_2;
1487 count++;
1488 }
1489 if (count > 1)
1490 lp->adapter_cnf |= A_CNF_MEDIA_AUTO;
1491 else if (lp->force & FORCE_RJ45)
1492 lp->adapter_cnf |= A_CNF_MEDIA_10B_T;
1493 else if (lp->force & FORCE_AUI)
1494 lp->adapter_cnf |= A_CNF_MEDIA_AUI;
1495 else if (lp->force & FORCE_BNC)
1496 lp->adapter_cnf |= A_CNF_MEDIA_10B_2;
1497 }
1498
1499 cs89_dbg(1, debug, "%s: after force 0x%x, adapter_cnf=0x%x\n",
1500 dev->name, lp->force, lp->adapter_cnf);
1501
1502 /* FIXME: We don't let you set dc-dc polarity or low RX squelch from the command line: add it here */
1503
1504 /* FIXME: We don't let you set the IMM bit from the command line: add it to lp->auto_neg_cnf here */
1505
1506 /* FIXME: we don't set the Ethernet address on the command line. Use
1507 * ifconfig IFACE hw ether AABBCCDDEEFF
1508 */
1509
1510 pr_info("media %s%s%s",
1511 (lp->adapter_cnf & A_CNF_10B_T) ? "RJ-45," : "",
1512 (lp->adapter_cnf & A_CNF_AUI) ? "AUI," : "",
1513 (lp->adapter_cnf & A_CNF_10B_2) ? "BNC," : "");
1514
1515 lp->irq_map = 0xffff;
1516
1517 /* If this is a CS8900 then no pnp soft */
1518 if (lp->chip_type != CS8900 &&
1519 /* Check if the ISA IRQ has been set */
1520 (i = readreg(dev, PP_CS8920_ISAINT) & 0xff,
1521 (i != 0 && i < CS8920_NO_INTS))) {
1522 if (!dev->irq)
1523 dev->irq = i;
1524 } else {
1525 i = lp->isa_config & INT_NO_MASK;
1526#ifndef CONFIG_CS89x0_PLATFORM
1527 if (lp->chip_type == CS8900) {
1528 /* Translate the IRQ using the IRQ mapping table. */
1529 if (i >= ARRAY_SIZE(cs8900_irq_map))
1530 pr_err("invalid ISA interrupt number %d\n", i);
1531 else
1532 i = cs8900_irq_map[i];
1533
1534 lp->irq_map = CS8900_IRQ_MAP; /* fixed IRQ map for CS8900 */
1535 } else {
1536 int irq_map_buff[IRQ_MAP_LEN/2];
1537
1538 if (get_eeprom_data(dev, IRQ_MAP_EEPROM_DATA,
1539 IRQ_MAP_LEN / 2,
1540 irq_map_buff) >= 0) {
1541 if ((irq_map_buff[0] & 0xff) == PNP_IRQ_FRMT)
1542 lp->irq_map = ((irq_map_buff[0] >> 8) |
1543 (irq_map_buff[1] << 8));
1544 }
1545 }
1546#endif
1547 if (!dev->irq)
1548 dev->irq = i;
1549 }
1550
1551 pr_cont(" IRQ %d", dev->irq);
1552
1553#if ALLOW_DMA
1554 if (lp->use_dma) {
1555 get_dma_channel(dev);
1556 pr_cont(", DMA %d", dev->dma);
1557 } else
1558#endif
1559 pr_cont(", programmed I/O");
1560
1561 /* print the ethernet address. */
1562 pr_cont(", MAC %pM\n", dev->dev_addr);
1563
1564 dev->netdev_ops = &net_ops;
1565 dev->watchdog_timeo = HZ;
1566
1567 cs89_dbg(0, info, "cs89x0_probe1() successful\n");
1568
1569 retval = register_netdev(dev);
1570 if (retval)
1571 goto out2;
1572 return 0;
1573out2:
1574 iowrite16(PP_ChipID, lp->virt_addr + ADD_PORT);
1575out1:
1576 return retval;
1577}
1578
1579#ifndef CONFIG_CS89x0_PLATFORM
1580/*
1581 * This function converts the I/O port address used by the cs89x0_probe() and
1582 * init_module() functions to the I/O memory address used by the
1583 * cs89x0_probe1() function.
1584 */
1585static int __init
1586cs89x0_ioport_probe(struct net_device *dev, unsigned long ioport, int modular)
1587{
1588 struct net_local *lp = netdev_priv(dev);
1589 int ret;
1590 void __iomem *io_mem;
1591
1592 if (!lp)
1593 return -ENOMEM;
1594
1595 dev->base_addr = ioport;
1596
1597 if (!request_region(ioport, NETCARD_IO_EXTENT, DRV_NAME)) {
1598 ret = -EBUSY;
1599 goto out;
1600 }
1601
1602 io_mem = ioport_map(ioport & ~3, NETCARD_IO_EXTENT);
1603 if (!io_mem) {
1604 ret = -ENOMEM;
1605 goto release;
1606 }
1607
1608 /* if they give us an odd I/O address, then do ONE write to
1609 * the address port, to get it back to address zero, where we
1610 * expect to find the EISA signature word. An IO with a base of 0x3
1611 * will skip the test for the ADD_PORT.
1612 */
1613 if (ioport & 1) {
1614 cs89_dbg(1, info, "%s: odd ioaddr 0x%lx\n", dev->name, ioport);
1615 if ((ioport & 2) != 2) {
1616 if ((ioread16(io_mem + ADD_PORT) & ADD_MASK) !=
1617 ADD_SIG) {
1618 pr_err("%s: bad signature 0x%x\n",
1619 dev->name, ioread16(io_mem + ADD_PORT));
1620 ret = -ENODEV;
1621 goto unmap;
1622 }
1623 }
1624 }
1625
1626 ret = cs89x0_probe1(dev, io_mem, modular);
1627 if (!ret)
1628 goto out;
1629unmap:
1630 ioport_unmap(io_mem);
1631release:
1632 release_region(ioport, NETCARD_IO_EXTENT);
1633out:
1634 return ret;
1635}
1636
1637#ifndef MODULE
1638/* Check for a network adaptor of this type, and return '0' iff one exists.
1639 * If dev->base_addr == 0, probe all likely locations.
1640 * If dev->base_addr == 1, always return failure.
1641 * If dev->base_addr == 2, allocate space for the device and return success
1642 * (detachable devices only).
1643 * Return 0 on success.
1644 */
1645
1646struct net_device * __init cs89x0_probe(int unit)
1647{
1648 struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
1649 unsigned *port;
1650 int err = 0;
1651 int irq;
1652 int io;
1653
1654 if (!dev)
1655 return ERR_PTR(-ENODEV);
1656
1657 sprintf(dev->name, "eth%d", unit);
1658 netdev_boot_setup_check(dev);
1659 io = dev->base_addr;
1660 irq = dev->irq;
1661
1662 cs89_dbg(0, info, "cs89x0_probe(0x%x)\n", io);
1663
1664 if (io > 0x1ff) { /* Check a single specified location. */
1665 err = cs89x0_ioport_probe(dev, io, 0);
1666 } else if (io != 0) { /* Don't probe at all. */
1667 err = -ENXIO;
1668 } else {
1669 for (port = netcard_portlist; *port; port++) {
1670 if (cs89x0_ioport_probe(dev, *port, 0) == 0)
1671 break;
1672 dev->irq = irq;
1673 }
1674 if (!*port)
1675 err = -ENODEV;
1676 }
1677 if (err)
1678 goto out;
1679 return dev;
1680out:
1681 free_netdev(dev);
1682 pr_warn("no cs8900 or cs8920 detected. Be sure to disable PnP with SETUP\n");
1683 return ERR_PTR(err);
1684}
1685#endif
1686#endif
1687
1688#if defined(MODULE) && !defined(CONFIG_CS89x0_PLATFORM)
1689
1690static struct net_device *dev_cs89x0;
1691
1692/* Support the 'debug' module parm even if we're compiled for non-debug to
1693 * avoid breaking someone's startup scripts
1694 */
1695
1696static int io;
1697static int irq;
1698static int debug;
1699static char media[8];
1700static int duplex = -1;
1701
1702static int use_dma; /* These generate unused var warnings if ALLOW_DMA = 0 */
1703static int dma;
1704static int dmasize = 16; /* or 64 */
1705
1706module_param(io, int, 0);
1707module_param(irq, int, 0);
1708module_param(debug, int, 0);
1709module_param_string(media, media, sizeof(media), 0);
1710module_param(duplex, int, 0);
1711module_param(dma , int, 0);
1712module_param(dmasize , int, 0);
1713module_param(use_dma , int, 0);
1714MODULE_PARM_DESC(io, "cs89x0 I/O base address");
1715MODULE_PARM_DESC(irq, "cs89x0 IRQ number");
1716#if DEBUGGING
1717MODULE_PARM_DESC(debug, "cs89x0 debug level (0-6)");
1718#else
1719MODULE_PARM_DESC(debug, "(ignored)");
1720#endif
1721MODULE_PARM_DESC(media, "Set cs89x0 adapter(s) media type(s) (rj45,bnc,aui)");
1722/* No other value than -1 for duplex seems to be currently interpreted */
1723MODULE_PARM_DESC(duplex, "(ignored)");
1724#if ALLOW_DMA
1725MODULE_PARM_DESC(dma , "cs89x0 ISA DMA channel; ignored if use_dma=0");
1726MODULE_PARM_DESC(dmasize , "cs89x0 DMA size in kB (16,64); ignored if use_dma=0");
1727MODULE_PARM_DESC(use_dma , "cs89x0 using DMA (0-1)");
1728#else
1729MODULE_PARM_DESC(dma , "(ignored)");
1730MODULE_PARM_DESC(dmasize , "(ignored)");
1731MODULE_PARM_DESC(use_dma , "(ignored)");
1732#endif
1733
1734MODULE_AUTHOR("Mike Cruse, Russwll Nelson <nelson@crynwr.com>, Andrew Morton");
1735MODULE_LICENSE("GPL");
1736
1737/*
1738 * media=t - specify media type
1739 * or media=2
1740 * or media=aui
1741 * or medai=auto
1742 * duplex=0 - specify forced half/full/autonegotiate duplex
1743 * debug=# - debug level
1744 *
1745 * Default Chip Configuration:
1746 * DMA Burst = enabled
1747 * IOCHRDY Enabled = enabled
1748 * UseSA = enabled
1749 * CS8900 defaults to half-duplex if not specified on command-line
1750 * CS8920 defaults to autoneg if not specified on command-line
1751 * Use reset defaults for other config parameters
1752 *
1753 * Assumptions:
1754 * media type specified is supported (circuitry is present)
1755 * if memory address is > 1MB, then required mem decode hw is present
1756 * if 10B-2, then agent other than driver will enable DC/DC converter
1757 * (hw or software util)
1758 */
1759
1760int __init init_module(void)
1761{
1762 struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
1763 struct net_local *lp;
1764 int ret = 0;
1765
1766#if DEBUGGING
1767 net_debug = debug;
1768#else
1769 debug = 0;
1770#endif
1771 if (!dev)
1772 return -ENOMEM;
1773
1774 dev->irq = irq;
1775 dev->base_addr = io;
1776 lp = netdev_priv(dev);
1777
1778#if ALLOW_DMA
1779 if (use_dma) {
1780 lp->use_dma = use_dma;
1781 lp->dma = dma;
1782 lp->dmasize = dmasize;
1783 }
1784#endif
1785
1786 spin_lock_init(&lp->lock);
1787
1788 /* boy, they'd better get these right */
1789 if (!strcmp(media, "rj45"))
1790 lp->adapter_cnf = A_CNF_MEDIA_10B_T | A_CNF_10B_T;
1791 else if (!strcmp(media, "aui"))
1792 lp->adapter_cnf = A_CNF_MEDIA_AUI | A_CNF_AUI;
1793 else if (!strcmp(media, "bnc"))
1794 lp->adapter_cnf = A_CNF_MEDIA_10B_2 | A_CNF_10B_2;
1795 else
1796 lp->adapter_cnf = A_CNF_MEDIA_10B_T | A_CNF_10B_T;
1797
1798 if (duplex == -1)
1799 lp->auto_neg_cnf = AUTO_NEG_ENABLE;
1800
1801 if (io == 0) {
1802 pr_err("Module autoprobing not allowed\n");
1803 pr_err("Append io=0xNNN\n");
1804 ret = -EPERM;
1805 goto out;
1806 } else if (io <= 0x1ff) {
1807 ret = -ENXIO;
1808 goto out;
1809 }
1810
1811#if ALLOW_DMA
1812 if (use_dma && dmasize != 16 && dmasize != 64) {
1813 pr_err("dma size must be either 16K or 64K, not %dK\n",
1814 dmasize);
1815 ret = -EPERM;
1816 goto out;
1817 }
1818#endif
1819 ret = cs89x0_ioport_probe(dev, io, 1);
1820 if (ret)
1821 goto out;
1822
1823 dev_cs89x0 = dev;
1824 return 0;
1825out:
1826 free_netdev(dev);
1827 return ret;
1828}
1829
1830void __exit
1831cleanup_module(void)
1832{
1833 struct net_local *lp = netdev_priv(dev_cs89x0);
1834
1835 unregister_netdev(dev_cs89x0);
1836 iowrite16(PP_ChipID, lp->virt_addr + ADD_PORT);
1837 ioport_unmap(lp->virt_addr);
1838 release_region(dev_cs89x0->base_addr, NETCARD_IO_EXTENT);
1839 free_netdev(dev_cs89x0);
1840}
1841#endif /* MODULE && !CONFIG_CS89x0_PLATFORM */
1842
1843#ifdef CONFIG_CS89x0_PLATFORM
1844static int __init cs89x0_platform_probe(struct platform_device *pdev)
1845{
1846 struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
1847 struct net_local *lp;
1848 struct resource *mem_res;
1849 void __iomem *virt_addr;
1850 int err;
1851
1852 if (!dev)
1853 return -ENOMEM;
1854
1855 lp = netdev_priv(dev);
1856
1857 dev->irq = platform_get_irq(pdev, 0);
1858 if (dev->irq <= 0) {
1859 dev_warn(&dev->dev, "interrupt resource missing\n");
1860 err = -ENXIO;
1861 goto free;
1862 }
1863
1864 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1865 virt_addr = devm_ioremap_resource(&pdev->dev, mem_res);
1866 if (IS_ERR(virt_addr)) {
1867 err = PTR_ERR(virt_addr);
1868 goto free;
1869 }
1870
1871 err = cs89x0_probe1(dev, virt_addr, 0);
1872 if (err) {
1873 dev_warn(&dev->dev, "no cs8900 or cs8920 detected\n");
1874 goto free;
1875 }
1876
1877 platform_set_drvdata(pdev, dev);
1878 return 0;
1879
1880free:
1881 free_netdev(dev);
1882 return err;
1883}
1884
1885static int cs89x0_platform_remove(struct platform_device *pdev)
1886{
1887 struct net_device *dev = platform_get_drvdata(pdev);
1888
1889 /* This platform_get_resource() call will not return NULL, because
1890 * the same call in cs89x0_platform_probe() has returned a non NULL
1891 * value.
1892 */
1893 unregister_netdev(dev);
1894 free_netdev(dev);
1895 return 0;
1896}
1897
1898static struct platform_driver cs89x0_driver = {
1899 .driver = {
1900 .name = DRV_NAME,
1901 },
1902 .remove = cs89x0_platform_remove,
1903};
1904
1905module_platform_driver_probe(cs89x0_driver, cs89x0_platform_probe);
1906
1907#endif /* CONFIG_CS89x0_PLATFORM */