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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / net / gt96100eth.c
blob666cfbbcf6d9173cb47129c4d2f7b41d93898ea8
1 /*
2 * Copyright 2000, 2001 MontaVista Software Inc.
3 * Author: MontaVista Software, Inc.
4 * stevel@mvista.com or source@mvista.com
5 *
6 * This program is free software; you can distribute it and/or modify it
7 * under the terms of the GNU General Public License (Version 2) as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
18 *
19 * Ethernet driver for the MIPS GT96100 Advanced Communication Controller.
20 *
21 * Revision history
22 *
23 * 11.11.2001 Moved to 2.4.14, ppopov@mvista.com. Modified driver to add
24 * proper gt96100A support.
25 * 12.05.2001 Moved eth port 0 to irq 3 (mapped to GT_SERINT0 on EV96100A)
26 * in order for both ports to work. Also cleaned up boot
27 * option support (mac address string parsing), fleshed out
28 * gt96100_cleanup_module(), and other general code cleanups
29 * <stevel@mvista.com>.
30 */
31 #include <linux/module.h>
32 #include <linux/kernel.h>
33 #include <linux/string.h>
34 #include <linux/timer.h>
35 #include <linux/errno.h>
36 #include <linux/in.h>
37 #include <linux/ioport.h>
38 #include <linux/slab.h>
39 #include <linux/interrupt.h>
40 #include <linux/pci.h>
41 #include <linux/init.h>
42 #include <linux/netdevice.h>
43 #include <linux/etherdevice.h>
44 #include <linux/skbuff.h>
45 #include <linux/delay.h>
46 #include <linux/ctype.h>
47 #include <linux/bitops.h>
48
49 #include <asm/irq.h>
50 #include <asm/io.h>
51
52 #define DESC_BE 1
53 #define DESC_DATA_BE 1
54
55 #define GT96100_DEBUG 2
56
57 #include "gt96100eth.h"
58
59 // prototypes
60 static void* dmaalloc(size_t size, dma_addr_t *dma_handle);
61 static void dmafree(size_t size, void *vaddr);
62 static void gt96100_delay(int msec);
63 static int gt96100_add_hash_entry(struct net_device *dev,
64 unsigned char* addr);
65 static void read_mib_counters(struct gt96100_private *gp);
66 static int read_MII(int phy_addr, u32 reg);
67 static int write_MII(int phy_addr, u32 reg, u16 data);
68 static int gt96100_init_module(void);
69 static void gt96100_cleanup_module(void);
70 static void dump_MII(int dbg_lvl, struct net_device *dev);
71 static void dump_tx_desc(int dbg_lvl, struct net_device *dev, int i);
72 static void dump_rx_desc(int dbg_lvl, struct net_device *dev, int i);
73 static void dump_skb(int dbg_lvl, struct net_device *dev,
74 struct sk_buff *skb);
75 static void dump_hw_addr(int dbg_lvl, struct net_device *dev,
76 const char* pfx, unsigned char* addr_str);
77 static void update_stats(struct gt96100_private *gp);
78 static void abort(struct net_device *dev, u32 abort_bits);
79 static void hard_stop(struct net_device *dev);
80 static void enable_ether_irq(struct net_device *dev);
81 static void disable_ether_irq(struct net_device *dev);
82 static int gt96100_probe1(struct pci_dev *pci, int port_num);
83 static void reset_tx(struct net_device *dev);
84 static void reset_rx(struct net_device *dev);
85 static int gt96100_check_tx_consistent(struct gt96100_private *gp);
86 static int gt96100_init(struct net_device *dev);
87 static int gt96100_open(struct net_device *dev);
88 static int gt96100_close(struct net_device *dev);
89 static int gt96100_tx(struct sk_buff *skb, struct net_device *dev);
90 static int gt96100_rx(struct net_device *dev, u32 status);
91 static irqreturn_t gt96100_interrupt(int irq, void *dev_id, struct pt_regs *regs);
92 static void gt96100_tx_timeout(struct net_device *dev);
93 static void gt96100_set_rx_mode(struct net_device *dev);
94 static struct net_device_stats* gt96100_get_stats(struct net_device *dev);
95
96 extern char * __init prom_getcmdline(void);
97
98 static int max_interrupt_work = 32;
99
100 #define nibswap(x) ((((x) >> 4) & 0x0f) | (((x) << 4) & 0xf0))
101
102 #define RUN_AT(x) (jiffies + (x))
103
104 // For reading/writing 32-bit words and half-words from/to DMA memory
105 #ifdef DESC_BE
106 #define cpu_to_dma32 cpu_to_be32
107 #define dma32_to_cpu be32_to_cpu
108 #define cpu_to_dma16 cpu_to_be16
109 #define dma16_to_cpu be16_to_cpu
110 #else
111 #define cpu_to_dma32 cpu_to_le32
112 #define dma32_to_cpu le32_to_cpu
113 #define cpu_to_dma16 cpu_to_le16
114 #define dma16_to_cpu le16_to_cpu
115 #endif
116
117 static char mac0[18] = "00.02.03.04.05.06";
118 static char mac1[18] = "00.01.02.03.04.05";
119 MODULE_PARM(mac0, "c18");
120 MODULE_PARM(mac1, "c18");
121 MODULE_PARM_DESC(mac0, "MAC address for GT96100 ethernet port 0");
122 MODULE_PARM_DESC(mac1, "MAC address for GT96100 ethernet port 1");
123
124 /*
125 * Info for the GT96100 ethernet controller's ports.
126 */
127 static struct gt96100_if_t {
128 struct net_device *dev;
129 unsigned int iobase; // IO Base address of this port
130 int irq; // IRQ number of this port
131 char *mac_str;
132 } gt96100_iflist[NUM_INTERFACES] = {
133 {
134 NULL,
135 GT96100_ETH0_BASE, GT96100_ETHER0_IRQ,
136 mac0
137 },
138 {
139 NULL,
140 GT96100_ETH1_BASE, GT96100_ETHER1_IRQ,
141 mac1
142 }
143 };
144
145 static inline const char*
146 chip_name(int chip_rev)
147 {
148 switch (chip_rev) {
149 case REV_GT96100:
150 return "GT96100";
151 case REV_GT96100A_1:
152 case REV_GT96100A:
153 return "GT96100A";
154 default:
155 return "Unknown GT96100";
156 }
157 }
158
159 /*
160 DMA memory allocation, derived from pci_alloc_consistent.
161 */
162 static void * dmaalloc(size_t size, dma_addr_t *dma_handle)
163 {
164 void *ret;
165
166 ret = (void *)__get_free_pages(GFP_ATOMIC | GFP_DMA, get_order(size));
167
168 if (ret != NULL) {
169 dma_cache_inv((unsigned long)ret, size);
170 if (dma_handle != NULL)
171 *dma_handle = virt_to_phys(ret);
172
173 /* bump virtual address up to non-cached area */
174 ret = (void*)KSEG1ADDR(ret);
175 }
176
177 return ret;
178 }
179
180 static void dmafree(size_t size, void *vaddr)
181 {
182 vaddr = (void*)KSEG0ADDR(vaddr);
183 free_pages((unsigned long)vaddr, get_order(size));
184 }
185
186 static void gt96100_delay(int ms)
187 {
188 if (in_interrupt())
189 return;
190 else
191 msleep_interruptible(ms);
192 }
193
194 static int
195 parse_mac_addr(struct net_device *dev, char* macstr)
196 {
197 int i, j;
198 unsigned char result, value;
199
200 for (i=0; i<6; i++) {
201 result = 0;
202 if (i != 5 && *(macstr+2) != '.') {
203 err(__FILE__ "invalid mac address format: %d %c\n",
204 i, *(macstr+2));
205 return -EINVAL;
206 }
207
208 for (j=0; j<2; j++) {
209 if (isxdigit(*macstr) &&
210 (value = isdigit(*macstr) ? *macstr-'0' :
211 toupper(*macstr)-'A'+10) < 16) {
212 result = result*16 + value;
213 macstr++;
214 } else {
215 err(__FILE__ "invalid mac address "
216 "character: %c\n", *macstr);
217 return -EINVAL;
218 }
219 }
220
221 macstr++; // step over '.'
222 dev->dev_addr[i] = result;
223 }
224
225 return 0;
226 }
227
228
229 static int
230 read_MII(int phy_addr, u32 reg)
231 {
232 int timedout = 20;
233 u32 smir = smirOpCode | (phy_addr << smirPhyAdBit) |
234 (reg << smirRegAdBit);
235
236 // wait for last operation to complete
237 while (GT96100_READ(GT96100_ETH_SMI_REG) & smirBusy) {
238 // snooze for 1 msec and check again
239 gt96100_delay(1);
240
241 if (--timedout == 0) {
242 printk(KERN_ERR "%s: busy timeout!!\n", __FUNCTION__);
243 return -ENODEV;
244 }
245 }
246
247 GT96100_WRITE(GT96100_ETH_SMI_REG, smir);
248
249 timedout = 20;
250 // wait for read to complete
251 while (!((smir = GT96100_READ(GT96100_ETH_SMI_REG)) & smirReadValid)) {
252 // snooze for 1 msec and check again
253 gt96100_delay(1);
254
255 if (--timedout == 0) {
256 printk(KERN_ERR "%s: timeout!!\n", __FUNCTION__);
257 return -ENODEV;
258 }
259 }
260
261 return (int)(smir & smirDataMask);
262 }
263
264 static void
265 dump_tx_desc(int dbg_lvl, struct net_device *dev, int i)
266 {
267 struct gt96100_private *gp = netdev_priv(dev);
268 gt96100_td_t *td = &gp->tx_ring[i];
269
270 dbg(dbg_lvl, "Tx descriptor at 0x%08lx:\n", virt_to_phys(td));
271 dbg(dbg_lvl,
272 " cmdstat=%04x, byte_cnt=%04x, buff_ptr=%04x, next=%04x\n",
273 dma32_to_cpu(td->cmdstat),
274 dma16_to_cpu(td->byte_cnt),
275 dma32_to_cpu(td->buff_ptr),
276 dma32_to_cpu(td->next));
277 }
278
279 static void
280 dump_rx_desc(int dbg_lvl, struct net_device *dev, int i)
281 {
282 struct gt96100_private *gp = netdev_priv(dev);
283 gt96100_rd_t *rd = &gp->rx_ring[i];
284
285 dbg(dbg_lvl, "Rx descriptor at 0x%08lx:\n", virt_to_phys(rd));
286 dbg(dbg_lvl, " cmdstat=%04x, buff_sz=%04x, byte_cnt=%04x, "
287 "buff_ptr=%04x, next=%04x\n",
288 dma32_to_cpu(rd->cmdstat),
289 dma16_to_cpu(rd->buff_sz),
290 dma16_to_cpu(rd->byte_cnt),
291 dma32_to_cpu(rd->buff_ptr),
292 dma32_to_cpu(rd->next));
293 }
294
295 static int
296 write_MII(int phy_addr, u32 reg, u16 data)
297 {
298 int timedout = 20;
299 u32 smir = (phy_addr << smirPhyAdBit) |
300 (reg << smirRegAdBit) | data;
301
302 // wait for last operation to complete
303 while (GT96100_READ(GT96100_ETH_SMI_REG) & smirBusy) {
304 // snooze for 1 msec and check again
305 gt96100_delay(1);
306
307 if (--timedout == 0) {
308 printk(KERN_ERR "%s: busy timeout!!\n", __FUNCTION__);
309 return -1;
310 }
311 }
312
313 GT96100_WRITE(GT96100_ETH_SMI_REG, smir);
314 return 0;
315 }
316
317 static void
318 dump_MII(int dbg_lvl, struct net_device *dev)
319 {
320 int i, val;
321 struct gt96100_private *gp = netdev_priv(dev);
322
323 if (dbg_lvl <= GT96100_DEBUG) {
324 for (i=0; i<7; i++) {
325 if ((val = read_MII(gp->phy_addr, i)) >= 0)
326 printk("MII Reg %d=%x\n", i, val);
327 }
328 for (i=16; i<21; i++) {
329 if ((val = read_MII(gp->phy_addr, i)) >= 0)
330 printk("MII Reg %d=%x\n", i, val);
331 }
332 }
333 }
334
335 static void
336 dump_hw_addr(int dbg_lvl, struct net_device *dev, const char* pfx,
337 unsigned char* addr_str)
338 {
339 int i;
340 char buf[100], octet[5];
341
342 if (dbg_lvl <= GT96100_DEBUG) {
343 strcpy(buf, pfx);
344 for (i = 0; i < 6; i++) {
345 sprintf(octet, "%2.2x%s",
346 addr_str[i], i<5 ? ":" : "\n");
347 strcat(buf, octet);
348 }
349 info("%s", buf);
350 }
351 }
352
353
354 static void
355 dump_skb(int dbg_lvl, struct net_device *dev, struct sk_buff *skb)
356 {
357 int i;
358 unsigned char* skbdata;
359
360 if (dbg_lvl <= GT96100_DEBUG) {
361 dbg(dbg_lvl, "%s: skb=%p, skb->data=%p, skb->len=%d\n",
362 __FUNCTION__, skb, skb->data, skb->len);
363
364 skbdata = (unsigned char*)KSEG1ADDR(skb->data);
365
366 for (i=0; i<skb->len; i++) {
367 if (!(i % 16))
368 printk(KERN_DEBUG "\n %3.3x: %2.2x,",
369 i, skbdata[i]);
370 else
371 printk(KERN_DEBUG "%2.2x,", skbdata[i]);
372 }
373 printk(KERN_DEBUG "\n");
374 }
375 }
376
377
378 static int
379 gt96100_add_hash_entry(struct net_device *dev, unsigned char* addr)
380 {
381 struct gt96100_private *gp = netdev_priv(dev);
382 //u16 hashResult, stmp;
383 //unsigned char ctmp, hash_ea[6];
384 u32 tblEntry1, tblEntry0, *tblEntryAddr;
385 int i;
386
387 tblEntry1 = hteValid | hteRD;
388 tblEntry1 |= (u32)addr[5] << 3;
389 tblEntry1 |= (u32)addr[4] << 11;
390 tblEntry1 |= (u32)addr[3] << 19;
391 tblEntry1 |= ((u32)addr[2] & 0x1f) << 27;
392 dbg(3, "%s: tblEntry1=%x\n", __FUNCTION__, tblEntry1);
393 tblEntry0 = ((u32)addr[2] >> 5) & 0x07;
394 tblEntry0 |= (u32)addr[1] << 3;
395 tblEntry0 |= (u32)addr[0] << 11;
396 dbg(3, "%s: tblEntry0=%x\n", __FUNCTION__, tblEntry0);
397
398 #if 0
399
400 for (i=0; i<6; i++) {
401 // nibble swap
402 ctmp = nibswap(addr[i]);
403 // invert every nibble
404 hash_ea[i] = ((ctmp&1)<<3) | ((ctmp&8)>>3) |
405 ((ctmp&2)<<1) | ((ctmp&4)>>1);
406 hash_ea[i] |= ((ctmp&0x10)<<3) | ((ctmp&0x80)>>3) |
407 ((ctmp&0x20)<<1) | ((ctmp&0x40)>>1);
408 }
409
410 dump_hw_addr(3, dev, "%s: nib swap/invt addr=", __FUNCTION__, hash_ea);
411
412 if (gp->hash_mode == 0) {
413 hashResult = ((u16)hash_ea[0] & 0xfc) << 7;
414 stmp = ((u16)hash_ea[0] & 0x03) |
415 (((u16)hash_ea[1] & 0x7f) << 2);
416 stmp ^= (((u16)hash_ea[1] >> 7) & 0x01) |
417 ((u16)hash_ea[2] << 1);
418 stmp ^= (u16)hash_ea[3] | (((u16)hash_ea[4] & 1) << 8);
419 hashResult |= stmp;
420 } else {
421 return -1; // don't support hash mode 1
422 }
423
424 dbg(3, "%s: hashResult=%x\n", __FUNCTION__, hashResult);
425
426 tblEntryAddr =
427 (u32 *)(&gp->hash_table[((u32)hashResult & 0x7ff) << 3]);
428
429 dbg(3, "%s: tblEntryAddr=%p\n", tblEntryAddr, __FUNCTION__);
430
431 for (i=0; i<HASH_HOP_NUMBER; i++) {
432 if ((*tblEntryAddr & hteValid) &&
433 !(*tblEntryAddr & hteSkip)) {
434 // This entry is already occupied, go to next entry
435 tblEntryAddr += 2;
436 dbg(3, "%s: skipping to %p\n", __FUNCTION__,
437 tblEntryAddr);
438 } else {
439 memset(tblEntryAddr, 0, 8);
440 tblEntryAddr[1] = cpu_to_dma32(tblEntry1);
441 tblEntryAddr[0] = cpu_to_dma32(tblEntry0);
442 break;
443 }
444 }
445
446 if (i >= HASH_HOP_NUMBER) {
447 err("%s: expired!\n", __FUNCTION__);
448 return -1; // Couldn't find an unused entry
449 }
450
451 #else
452
453 tblEntryAddr = (u32 *)gp->hash_table;
454 for (i=0; i<RX_HASH_TABLE_SIZE/4; i+=2) {
455 tblEntryAddr[i+1] = cpu_to_dma32(tblEntry1);
456 tblEntryAddr[i] = cpu_to_dma32(tblEntry0);
457 }
458
459 #endif
460
461 return 0;
462 }
463
464
465 static void
466 read_mib_counters(struct gt96100_private *gp)
467 {
468 u32* mib_regs = (u32*)&gp->mib;
469 int i;
470
471 for (i=0; i<sizeof(mib_counters_t)/sizeof(u32); i++)
472 mib_regs[i] = GT96100ETH_READ(gp, GT96100_ETH_MIB_COUNT_BASE +
473 i*sizeof(u32));
474 }
475
476
477 static void
478 update_stats(struct gt96100_private *gp)
479 {
480 mib_counters_t *mib = &gp->mib;
481 struct net_device_stats *stats = &gp->stats;
482
483 read_mib_counters(gp);
484
485 stats->rx_packets = mib->totalFramesReceived;
486 stats->tx_packets = mib->framesSent;
487 stats->rx_bytes = mib->totalByteReceived;
488 stats->tx_bytes = mib->byteSent;
489 stats->rx_errors = mib->totalFramesReceived - mib->framesReceived;
490 //the tx error counters are incremented by the ISR
491 //rx_dropped incremented by gt96100_rx
492 //tx_dropped incremented by gt96100_tx
493 stats->multicast = mib->multicastFramesReceived;
494 // collisions incremented by gt96100_tx_complete
495 stats->rx_length_errors = mib->oversizeFrames + mib->fragments;
496 // The RxError condition means the Rx DMA encountered a
497 // CPU owned descriptor, which, if things are working as
498 // they should, means the Rx ring has overflowed.
499 stats->rx_over_errors = mib->macRxError;
500 stats->rx_crc_errors = mib->cRCError;
501 }
502
503 static void
504 abort(struct net_device *dev, u32 abort_bits)
505 {
506 struct gt96100_private *gp = netdev_priv(dev);
507 int timedout = 100; // wait up to 100 msec for hard stop to complete
508
509 dbg(3, "%s\n", __FUNCTION__);
510
511 // Return if neither Rx or Tx abort bits are set
512 if (!(abort_bits & (sdcmrAR | sdcmrAT)))
513 return;
514
515 // make sure only the Rx/Tx abort bits are set
516 abort_bits &= (sdcmrAR | sdcmrAT);
517
518 spin_lock(&gp->lock);
519
520 // abort any Rx/Tx DMA immediately
521 GT96100ETH_WRITE(gp, GT96100_ETH_SDMA_COMM, abort_bits);
522
523 dbg(3, "%s: SDMA comm = %x\n", __FUNCTION__,
524 GT96100ETH_READ(gp, GT96100_ETH_SDMA_COMM));
525
526 // wait for abort to complete
527 while (GT96100ETH_READ(gp, GT96100_ETH_SDMA_COMM) & abort_bits) {
528 // snooze for 1 msec and check again
529 gt96100_delay(1);
530
531 if (--timedout == 0) {
532 err("%s: timeout!!\n", __FUNCTION__);
533 break;
534 }
535 }
536
537 spin_unlock(&gp->lock);
538 }
539
540
541 static void
542 hard_stop(struct net_device *dev)
543 {
544 struct gt96100_private *gp = netdev_priv(dev);
545
546 dbg(3, "%s\n", __FUNCTION__);
547
548 disable_ether_irq(dev);
549
550 abort(dev, sdcmrAR | sdcmrAT);
551
552 // disable port
553 GT96100ETH_WRITE(gp, GT96100_ETH_PORT_CONFIG, 0);
554 }
555
556
557 static void
558 enable_ether_irq(struct net_device *dev)
559 {
560 struct gt96100_private *gp = netdev_priv(dev);
561 u32 intMask;
562 /*
563 * route ethernet interrupt to GT_SERINT0 for port 0,
564 * GT_INT0 for port 1.
565 */
566 int intr_mask_reg = (gp->port_num == 0) ?
567 GT96100_SERINT0_MASK : GT96100_INT0_HIGH_MASK;
568
569 if (gp->chip_rev >= REV_GT96100A_1) {
570 intMask = icrTxBufferLow | icrTxEndLow |
571 icrTxErrorLow | icrRxOVR | icrTxUdr |
572 icrRxBufferQ0 | icrRxErrorQ0 |
573 icrMIIPhySTC | icrEtherIntSum;
574 }
575 else {
576 intMask = icrTxBufferLow | icrTxEndLow |
577 icrTxErrorLow | icrRxOVR | icrTxUdr |
578 icrRxBuffer | icrRxError |
579 icrMIIPhySTC | icrEtherIntSum;
580 }
581
582 // unmask interrupts
583 GT96100ETH_WRITE(gp, GT96100_ETH_INT_MASK, intMask);
584
585 intMask = GT96100_READ(intr_mask_reg);
586 intMask |= 1<<gp->port_num;
587 GT96100_WRITE(intr_mask_reg, intMask);
588 }
589
590 static void
591 disable_ether_irq(struct net_device *dev)
592 {
593 struct gt96100_private *gp = netdev_priv(dev);
594 u32 intMask;
595 int intr_mask_reg = (gp->port_num == 0) ?
596 GT96100_SERINT0_MASK : GT96100_INT0_HIGH_MASK;
597
598 intMask = GT96100_READ(intr_mask_reg);
599 intMask &= ~(1<<gp->port_num);
600 GT96100_WRITE(intr_mask_reg, intMask);
601
602 GT96100ETH_WRITE(gp, GT96100_ETH_INT_MASK, 0);
603 }
604
605
606 /*
607 * Init GT96100 ethernet controller driver
608 */
609 static int gt96100_init_module(void)
610 {
611 struct pci_dev *pci;
612 int i, retval=0;
613 u32 cpuConfig;
614
615 /*
616 * Stupid probe because this really isn't a PCI device
617 */
618 if (!(pci = pci_find_device(PCI_VENDOR_ID_MARVELL,
619 PCI_DEVICE_ID_MARVELL_GT96100, NULL)) &&
620 !(pci = pci_find_device(PCI_VENDOR_ID_MARVELL,
621 PCI_DEVICE_ID_MARVELL_GT96100A, NULL))) {
622 printk(KERN_ERR __FILE__ ": GT96100 not found!\n");
623 return -ENODEV;
624 }
625
626 cpuConfig = GT96100_READ(GT96100_CPU_INTERF_CONFIG);
627 if (cpuConfig & (1<<12)) {
628 printk(KERN_ERR __FILE__
629 ": must be in Big Endian mode!\n");
630 return -ENODEV;
631 }
632
633 for (i=0; i < NUM_INTERFACES; i++)
634 retval |= gt96100_probe1(pci, i);
635
636 return retval;
637 }
638
639 static int __init gt96100_probe1(struct pci_dev *pci, int port_num)
640 {
641 struct gt96100_private *gp = NULL;
642 struct gt96100_if_t *gtif = &gt96100_iflist[port_num];
643 int phy_addr, phy_id1, phy_id2;
644 u32 phyAD;
645 int retval;
646 unsigned char chip_rev;
647 struct net_device *dev = NULL;
648
649 if (gtif->irq < 0) {
650 printk(KERN_ERR "%s: irq unknown - probing not supported\n",
651 __FUNCTION__);
652 return -ENODEV;
653 }
654
655 pci_read_config_byte(pci, PCI_REVISION_ID, &chip_rev);
656
657 if (chip_rev >= REV_GT96100A_1) {
658 phyAD = GT96100_READ(GT96100_ETH_PHY_ADDR_REG);
659 phy_addr = (phyAD >> (5*port_num)) & 0x1f;
660 } else {
661 /*
662 * not sure what's this about -- probably a gt bug
663 */
664 phy_addr = port_num;
665 phyAD = GT96100_READ(GT96100_ETH_PHY_ADDR_REG);
666 phyAD &= ~(0x1f << (port_num*5));
667 phyAD |= phy_addr << (port_num*5);
668 GT96100_WRITE(GT96100_ETH_PHY_ADDR_REG, phyAD);
669 }
670
671 // probe for the external PHY
672 if ((phy_id1 = read_MII(phy_addr, 2)) <= 0 ||
673 (phy_id2 = read_MII(phy_addr, 3)) <= 0) {
674 printk(KERN_ERR "%s: no PHY found on MII%d\n", __FUNCTION__, port_num);
675 return -ENODEV;
676 }
677
678 if (!request_region(gtif->iobase, GT96100_ETH_IO_SIZE, "GT96100ETH")) {
679 printk(KERN_ERR "%s: request_region failed\n", __FUNCTION__);
680 return -EBUSY;
681 }
682
683 dev = alloc_etherdev(sizeof(struct gt96100_private));
684 if (!dev)
685 goto out;
686 gtif->dev = dev;
687
688 /* private struct aligned and zeroed by alloc_etherdev */
689 /* Fill in the 'dev' fields. */
690 dev->base_addr = gtif->iobase;
691 dev->irq = gtif->irq;
692
693 if ((retval = parse_mac_addr(dev, gtif->mac_str))) {
694 err("%s: MAC address parse failed\n", __FUNCTION__);
695 retval = -EINVAL;
696 goto out1;
697 }
698
699 gp = netdev_priv(dev);
700
701 memset(gp, 0, sizeof(*gp)); // clear it
702
703 gp->port_num = port_num;
704 gp->io_size = GT96100_ETH_IO_SIZE;
705 gp->port_offset = port_num * GT96100_ETH_IO_SIZE;
706 gp->phy_addr = phy_addr;
707 gp->chip_rev = chip_rev;
708
709 info("%s found at 0x%x, irq %d\n",
710 chip_name(gp->chip_rev), gtif->iobase, gtif->irq);
711 dump_hw_addr(0, dev, "HW Address ", dev->dev_addr);
712 info("%s chip revision=%d\n", chip_name(gp->chip_rev), gp->chip_rev);
713 info("%s ethernet port %d\n", chip_name(gp->chip_rev), gp->port_num);
714 info("external PHY ID1=0x%04x, ID2=0x%04x\n", phy_id1, phy_id2);
715
716 // Allocate Rx and Tx descriptor rings
717 if (gp->rx_ring == NULL) {
718 // All descriptors in ring must be 16-byte aligned
719 gp->rx_ring = dmaalloc(sizeof(gt96100_rd_t) * RX_RING_SIZE
720 + sizeof(gt96100_td_t) * TX_RING_SIZE,
721 &gp->rx_ring_dma);
722 if (gp->rx_ring == NULL) {
723 retval = -ENOMEM;
724 goto out1;
725 }
726
727 gp->tx_ring = (gt96100_td_t *)(gp->rx_ring + RX_RING_SIZE);
728 gp->tx_ring_dma =
729 gp->rx_ring_dma + sizeof(gt96100_rd_t) * RX_RING_SIZE;
730 }
731
732 // Allocate the Rx Data Buffers
733 if (gp->rx_buff == NULL) {
734 gp->rx_buff = dmaalloc(PKT_BUF_SZ*RX_RING_SIZE,
735 &gp->rx_buff_dma);
736 if (gp->rx_buff == NULL) {
737 retval = -ENOMEM;
738 goto out2;
739 }
740 }
741
742 dbg(3, "%s: rx_ring=%p, tx_ring=%p\n", __FUNCTION__,
743 gp->rx_ring, gp->tx_ring);
744
745 // Allocate Rx Hash Table
746 if (gp->hash_table == NULL) {
747 gp->hash_table = (char*)dmaalloc(RX_HASH_TABLE_SIZE,
748 &gp->hash_table_dma);
749 if (gp->hash_table == NULL) {
750 retval = -ENOMEM;
751 goto out3;
752 }
753 }
754
755 dbg(3, "%s: hash=%p\n", __FUNCTION__, gp->hash_table);
756
757 spin_lock_init(&gp->lock);
758
759 dev->open = gt96100_open;
760 dev->hard_start_xmit = gt96100_tx;
761 dev->stop = gt96100_close;
762 dev->get_stats = gt96100_get_stats;
763 //dev->do_ioctl = gt96100_ioctl;
764 dev->set_multicast_list = gt96100_set_rx_mode;
765 dev->tx_timeout = gt96100_tx_timeout;
766 dev->watchdog_timeo = GT96100ETH_TX_TIMEOUT;
767
768 retval = register_netdev(dev);
769 if (retval)
770 goto out4;
771 return 0;
772
773 out4:
774 dmafree(RX_HASH_TABLE_SIZE, gp->hash_table_dma);
775 out3:
776 dmafree(PKT_BUF_SZ*RX_RING_SIZE, gp->rx_buff);
777 out2:
778 dmafree(sizeof(gt96100_rd_t) * RX_RING_SIZE
779 + sizeof(gt96100_td_t) * TX_RING_SIZE,
780 gp->rx_ring);
781 out1:
782 free_netdev (dev);
783 out:
784 release_region(gtif->iobase, GT96100_ETH_IO_SIZE);
785
786 err("%s failed. Returns %d\n", __FUNCTION__, retval);
787 return retval;
788 }
789
790
791 static void
792 reset_tx(struct net_device *dev)
793 {
794 struct gt96100_private *gp = netdev_priv(dev);
795 int i;
796
797 abort(dev, sdcmrAT);
798
799 for (i=0; i<TX_RING_SIZE; i++) {
800 if (gp->tx_skbuff[i]) {
801 if (in_interrupt())
802 dev_kfree_skb_irq(gp->tx_skbuff[i]);
803 else
804 dev_kfree_skb(gp->tx_skbuff[i]);
805 gp->tx_skbuff[i] = NULL;
806 }
807
808 gp->tx_ring[i].cmdstat = 0; // CPU owns
809 gp->tx_ring[i].byte_cnt = 0;
810 gp->tx_ring[i].buff_ptr = 0;
811 gp->tx_ring[i].next =
812 cpu_to_dma32(gp->tx_ring_dma +
813 sizeof(gt96100_td_t) * (i+1));
814 dump_tx_desc(4, dev, i);
815 }
816 /* Wrap the ring. */
817 gp->tx_ring[i-1].next = cpu_to_dma32(gp->tx_ring_dma);
818
819 // setup only the lowest priority TxCDP reg
820 GT96100ETH_WRITE(gp, GT96100_ETH_CURR_TX_DESC_PTR0, gp->tx_ring_dma);
821 GT96100ETH_WRITE(gp, GT96100_ETH_CURR_TX_DESC_PTR1, 0);
822
823 // init Tx indeces and pkt counter
824 gp->tx_next_in = gp->tx_next_out = 0;
825 gp->tx_count = 0;
826
827 }
828
829 static void
830 reset_rx(struct net_device *dev)
831 {
832 struct gt96100_private *gp = netdev_priv(dev);
833 int i;
834
835 abort(dev, sdcmrAR);
836
837 for (i=0; i<RX_RING_SIZE; i++) {
838 gp->rx_ring[i].next =
839 cpu_to_dma32(gp->rx_ring_dma +
840 sizeof(gt96100_rd_t) * (i+1));
841 gp->rx_ring[i].buff_ptr =
842 cpu_to_dma32(gp->rx_buff_dma + i*PKT_BUF_SZ);
843 gp->rx_ring[i].buff_sz = cpu_to_dma16(PKT_BUF_SZ);
844 // Give ownership to device, set first and last, enable intr
845 gp->rx_ring[i].cmdstat =
846 cpu_to_dma32((u32)(rxFirst | rxLast | rxOwn | rxEI));
847 dump_rx_desc(4, dev, i);
848 }
849 /* Wrap the ring. */
850 gp->rx_ring[i-1].next = cpu_to_dma32(gp->rx_ring_dma);
851
852 // Setup only the lowest priority RxFDP and RxCDP regs
853 for (i=0; i<4; i++) {
854 if (i == 0) {
855 GT96100ETH_WRITE(gp, GT96100_ETH_1ST_RX_DESC_PTR0,
856 gp->rx_ring_dma);
857 GT96100ETH_WRITE(gp, GT96100_ETH_CURR_RX_DESC_PTR0,
858 gp->rx_ring_dma);
859 } else {
860 GT96100ETH_WRITE(gp,
861 GT96100_ETH_1ST_RX_DESC_PTR0 + i*4,
862 0);
863 GT96100ETH_WRITE(gp,
864 GT96100_ETH_CURR_RX_DESC_PTR0 + i*4,
865 0);
866 }
867 }
868
869 // init Rx NextOut index
870 gp->rx_next_out = 0;
871 }
872
873
874 // Returns 1 if the Tx counter and indeces don't gel
875 static int
876 gt96100_check_tx_consistent(struct gt96100_private *gp)
877 {
878 int diff = gp->tx_next_in - gp->tx_next_out;
879
880 diff = diff<0 ? TX_RING_SIZE + diff : diff;
881 diff = gp->tx_count == TX_RING_SIZE ? diff + TX_RING_SIZE : diff;
882
883 return (diff != gp->tx_count);
884 }
885
886 static int
887 gt96100_init(struct net_device *dev)
888 {
889 struct gt96100_private *gp = netdev_priv(dev);
890 u32 tmp;
891 u16 mii_reg;
892
893 dbg(3, "%s: dev=%p\n", __FUNCTION__, dev);
894 dbg(3, "%s: scs10_lo=%4x, scs10_hi=%4x\n", __FUNCTION__,
895 GT96100_READ(0x8), GT96100_READ(0x10));
896 dbg(3, "%s: scs32_lo=%4x, scs32_hi=%4x\n", __FUNCTION__,
897 GT96100_READ(0x18), GT96100_READ(0x20));
898
899 // Stop and disable Port
900 hard_stop(dev);
901
902 // Setup CIU Arbiter
903 tmp = GT96100_READ(GT96100_CIU_ARBITER_CONFIG);
904 tmp |= (0x0c << (gp->port_num*2)); // set Ether DMA req priority to hi
905 #ifndef DESC_BE
906 tmp &= ~(1<<31); // set desc endianess to little
907 #else
908 tmp |= (1<<31);
909 #endif
910 GT96100_WRITE(GT96100_CIU_ARBITER_CONFIG, tmp);
911 dbg(3, "%s: CIU Config=%x/%x\n", __FUNCTION__,
912 tmp, GT96100_READ(GT96100_CIU_ARBITER_CONFIG));
913
914 // Set routing.
915 tmp = GT96100_READ(GT96100_ROUTE_MAIN) & (0x3f << 18);
916 tmp |= (0x07 << (18 + gp->port_num*3));
917 GT96100_WRITE(GT96100_ROUTE_MAIN, tmp);
918
919 /* set MII as peripheral func */
920 tmp = GT96100_READ(GT96100_GPP_CONFIG2);
921 tmp |= 0x7fff << (gp->port_num*16);
922 GT96100_WRITE(GT96100_GPP_CONFIG2, tmp);
923
924 /* Set up MII port pin directions */
925 tmp = GT96100_READ(GT96100_GPP_IO2);
926 tmp |= 0x003d << (gp->port_num*16);
927 GT96100_WRITE(GT96100_GPP_IO2, tmp);
928
929 // Set-up hash table
930 memset(gp->hash_table, 0, RX_HASH_TABLE_SIZE); // clear it
931 gp->hash_mode = 0;
932 // Add a single entry to hash table - our ethernet address
933 gt96100_add_hash_entry(dev, dev->dev_addr);
934 // Set-up DMA ptr to hash table
935 GT96100ETH_WRITE(gp, GT96100_ETH_HASH_TBL_PTR, gp->hash_table_dma);
936 dbg(3, "%s: Hash Tbl Ptr=%x\n", __FUNCTION__,
937 GT96100ETH_READ(gp, GT96100_ETH_HASH_TBL_PTR));
938
939 // Setup Tx
940 reset_tx(dev);
941
942 dbg(3, "%s: Curr Tx Desc Ptr0=%x\n", __FUNCTION__,
943 GT96100ETH_READ(gp, GT96100_ETH_CURR_TX_DESC_PTR0));
944
945 // Setup Rx
946 reset_rx(dev);
947
948 dbg(3, "%s: 1st/Curr Rx Desc Ptr0=%x/%x\n", __FUNCTION__,
949 GT96100ETH_READ(gp, GT96100_ETH_1ST_RX_DESC_PTR0),
950 GT96100ETH_READ(gp, GT96100_ETH_CURR_RX_DESC_PTR0));
951
952 // eth port config register
953 GT96100ETH_WRITE(gp, GT96100_ETH_PORT_CONFIG_EXT,
954 pcxrFCTL | pcxrFCTLen | pcxrFLP | pcxrDPLXen);
955
956 mii_reg = read_MII(gp->phy_addr, 0x11); /* int enable register */
957 mii_reg |= 2; /* enable mii interrupt */
958 write_MII(gp->phy_addr, 0x11, mii_reg);
959
960 dbg(3, "%s: PhyAD=%x\n", __FUNCTION__,
961 GT96100_READ(GT96100_ETH_PHY_ADDR_REG));
962
963 // setup DMA
964
965 // We want the Rx/Tx DMA to write/read data to/from memory in
966 // Big Endian mode. Also set DMA Burst Size to 8 64Bit words.
967 #ifdef DESC_DATA_BE
968 GT96100ETH_WRITE(gp, GT96100_ETH_SDMA_CONFIG,
969 (0xf<<sdcrRCBit) | sdcrRIFB | (3<<sdcrBSZBit));
970 #else
971 GT96100ETH_WRITE(gp, GT96100_ETH_SDMA_CONFIG,
972 sdcrBLMR | sdcrBLMT |
973 (0xf<<sdcrRCBit) | sdcrRIFB | (3<<sdcrBSZBit));
974 #endif
975 dbg(3, "%s: SDMA Config=%x\n", __FUNCTION__,
976 GT96100ETH_READ(gp, GT96100_ETH_SDMA_CONFIG));
977
978 // start Rx DMA
979 GT96100ETH_WRITE(gp, GT96100_ETH_SDMA_COMM, sdcmrERD);
980 dbg(3, "%s: SDMA Comm=%x\n", __FUNCTION__,
981 GT96100ETH_READ(gp, GT96100_ETH_SDMA_COMM));
982
983 // enable this port (set hash size to 1/2K)
984 GT96100ETH_WRITE(gp, GT96100_ETH_PORT_CONFIG, pcrEN | pcrHS);
985 dbg(3, "%s: Port Config=%x\n", __FUNCTION__,
986 GT96100ETH_READ(gp, GT96100_ETH_PORT_CONFIG));
987
988 /*
989 * Disable all Type-of-Service queueing. All Rx packets will be
990 * treated normally and will be sent to the lowest priority
991 * queue.
992 *
993 * Disable flow-control for now. FIXME: support flow control?
994 */
995
996 // clear all the MIB ctr regs
997 GT96100ETH_WRITE(gp, GT96100_ETH_PORT_CONFIG_EXT,
998 pcxrFCTL | pcxrFCTLen | pcxrFLP |
999 pcxrPRIOrxOverride);
1000 read_mib_counters(gp);
1001 GT96100ETH_WRITE(gp, GT96100_ETH_PORT_CONFIG_EXT,
1002 pcxrFCTL | pcxrFCTLen | pcxrFLP |
1003 pcxrPRIOrxOverride | pcxrMIBclrMode);
1004
1005 dbg(3, "%s: Port Config Ext=%x\n", __FUNCTION__,
1006 GT96100ETH_READ(gp, GT96100_ETH_PORT_CONFIG_EXT));
1007
1008 netif_start_queue(dev);
1009
1010 dump_MII(4, dev);
1011
1012 // enable interrupts
1013 enable_ether_irq(dev);
1014
1015 // we should now be receiving frames
1016 return 0;
1017 }
1018
1019
1020 static int
1021 gt96100_open(struct net_device *dev)
1022 {
1023 int retval;
1024
1025 dbg(2, "%s: dev=%p\n", __FUNCTION__, dev);
1026
1027 // Initialize and startup the GT-96100 ethernet port
1028 if ((retval = gt96100_init(dev))) {
1029 err("error in gt96100_init\n");
1030 free_irq(dev->irq, dev);
1031 return retval;
1032 }
1033
1034 if ((retval = request_irq(dev->irq, &gt96100_interrupt,
1035 SA_SHIRQ, dev->name, dev))) {
1036 err("unable to get IRQ %d\n", dev->irq);
1037 return retval;
1038 }
1039
1040 dbg(2, "%s: Initialization done.\n", __FUNCTION__);
1041
1042 return 0;
1043 }
1044
1045 static int
1046 gt96100_close(struct net_device *dev)
1047 {
1048 dbg(3, "%s: dev=%p\n", __FUNCTION__, dev);
1049
1050 // stop the device
1051 if (netif_device_present(dev)) {
1052 netif_stop_queue(dev);
1053 hard_stop(dev);
1054 }
1055
1056 free_irq(dev->irq, dev);
1057
1058 return 0;
1059 }
1060
1061
1062 static int
1063 gt96100_tx(struct sk_buff *skb, struct net_device *dev)
1064 {
1065 struct gt96100_private *gp = netdev_priv(dev);
1066 unsigned long flags;
1067 int nextIn;
1068
1069 spin_lock_irqsave(&gp->lock, flags);
1070
1071 nextIn = gp->tx_next_in;
1072
1073 dbg(3, "%s: nextIn=%d\n", __FUNCTION__, nextIn);
1074
1075 if (gp->tx_count >= TX_RING_SIZE) {
1076 warn("Tx Ring full, pkt dropped.\n");
1077 gp->stats.tx_dropped++;
1078 spin_unlock_irqrestore(&gp->lock, flags);
1079 return 1;
1080 }
1081
1082 if (!(gp->last_psr & psrLink)) {
1083 err("%s: Link down, pkt dropped.\n", __FUNCTION__);
1084 gp->stats.tx_dropped++;
1085 spin_unlock_irqrestore(&gp->lock, flags);
1086 return 1;
1087 }
1088
1089 if (dma32_to_cpu(gp->tx_ring[nextIn].cmdstat) & txOwn) {
1090 err("%s: device owns descriptor, pkt dropped.\n", __FUNCTION__);
1091 gp->stats.tx_dropped++;
1092 // stop the queue, so Tx timeout can fix it
1093 netif_stop_queue(dev);
1094 spin_unlock_irqrestore(&gp->lock, flags);
1095 return 1;
1096 }
1097
1098 // Prepare the Descriptor at tx_next_in
1099 gp->tx_skbuff[nextIn] = skb;
1100 gp->tx_ring[nextIn].byte_cnt = cpu_to_dma16(skb->len);
1101 gp->tx_ring[nextIn].buff_ptr = cpu_to_dma32(virt_to_phys(skb->data));
1102 // make sure packet gets written back to memory
1103 dma_cache_wback_inv((unsigned long)(skb->data), skb->len);
1104 // Give ownership to device, set first and last desc, enable interrupt
1105 // Setting of ownership bit must be *last*!
1106 gp->tx_ring[nextIn].cmdstat =
1107 cpu_to_dma32((u32)(txOwn | txGenCRC | txEI |
1108 txPad | txFirst | txLast));
1109
1110 dump_tx_desc(4, dev, nextIn);
1111 dump_skb(4, dev, skb);
1112
1113 // increment tx_next_in with wrap
1114 gp->tx_next_in = (nextIn + 1) % TX_RING_SIZE;
1115 // If DMA is stopped, restart
1116 if (!(GT96100ETH_READ(gp, GT96100_ETH_PORT_STATUS) & psrTxLow))
1117 GT96100ETH_WRITE(gp, GT96100_ETH_SDMA_COMM,
1118 sdcmrERD | sdcmrTXDL);
1119
1120 // increment count and stop queue if full
1121 if (++gp->tx_count == TX_RING_SIZE) {
1122 gp->tx_full = 1;
1123 netif_stop_queue(dev);
1124 dbg(2, "Tx Ring now full, queue stopped.\n");
1125 }
1126
1127 dev->trans_start = jiffies;
1128 spin_unlock_irqrestore(&gp->lock, flags);
1129
1130 return 0;
1131 }
1132
1133
1134 static int
1135 gt96100_rx(struct net_device *dev, u32 status)
1136 {
1137 struct gt96100_private *gp = netdev_priv(dev);
1138 struct sk_buff *skb;
1139 int pkt_len, nextOut, cdp;
1140 gt96100_rd_t *rd;
1141 u32 cmdstat;
1142
1143 dbg(3, "%s: dev=%p, status=%x\n", __FUNCTION__, dev, status);
1144
1145 cdp = (GT96100ETH_READ(gp, GT96100_ETH_1ST_RX_DESC_PTR0)
1146 - gp->rx_ring_dma) / sizeof(gt96100_rd_t);
1147
1148 // Continue until we reach 1st descriptor pointer
1149 for (nextOut = gp->rx_next_out; nextOut != cdp;
1150 nextOut = (nextOut + 1) % RX_RING_SIZE) {
1151
1152 if (--gp->intr_work_done == 0)
1153 break;
1154
1155 rd = &gp->rx_ring[nextOut];
1156 cmdstat = dma32_to_cpu(rd->cmdstat);
1157
1158 dbg(4, "%s: Rx desc cmdstat=%x, nextOut=%d\n", __FUNCTION__,
1159 cmdstat, nextOut);
1160
1161 if (cmdstat & (u32)rxOwn) {
1162 //err("%s: device owns descriptor!\n", __FUNCTION__);
1163 // DMA is not finished updating descriptor???
1164 // Leave and come back later to pick-up where
1165 // we left off.
1166 break;
1167 }
1168
1169 // Drop this received pkt if there were any errors
1170 if (((cmdstat & (u32)(rxErrorSummary)) &&
1171 (cmdstat & (u32)(rxFirst))) || (status & icrRxError)) {
1172 // update the detailed rx error counters that
1173 // are not covered by the MIB counters.
1174 if (cmdstat & (u32)rxOverrun)
1175 gp->stats.rx_fifo_errors++;
1176 cmdstat |= (u32)rxOwn;
1177 rd->cmdstat = cpu_to_dma32(cmdstat);
1178 continue;
1179 }
1180
1181 /*
1182 * Must be first and last (ie only) descriptor of packet. We
1183 * ignore (drop) any packets that do not fit in one descriptor.
1184 * Every descriptor's receive buffer is large enough to hold
1185 * the maximum 802.3 frame size, so a multi-descriptor packet
1186 * indicates an error. Most if not all corrupted packets will
1187 * have already been dropped by the above check for the
1188 * rxErrorSummary status bit.
1189 */
1190 if (!(cmdstat & (u32)rxFirst) || !(cmdstat & (u32)rxLast)) {
1191 if (cmdstat & (u32)rxFirst) {
1192 /*
1193 * This is the first descriptor of a
1194 * multi-descriptor packet. It isn't corrupted
1195 * because the above check for rxErrorSummary
1196 * would have dropped it already, so what's
1197 * the deal with this packet? Good question,
1198 * let's dump it out.
1199 */
1200 err("%s: desc not first and last!\n", __FUNCTION__);
1201 dump_rx_desc(0, dev, nextOut);
1202 }
1203 cmdstat |= (u32)rxOwn;
1204 rd->cmdstat = cpu_to_dma32(cmdstat);
1205 // continue to drop every descriptor of this packet
1206 continue;
1207 }
1208
1209 pkt_len = dma16_to_cpu(rd->byte_cnt);
1210
1211 /* Create new skb. */
1212 skb = dev_alloc_skb(pkt_len+2);
1213 if (skb == NULL) {
1214 err("%s: Memory squeeze, dropping packet.\n", __FUNCTION__);
1215 gp->stats.rx_dropped++;
1216 cmdstat |= (u32)rxOwn;
1217 rd->cmdstat = cpu_to_dma32(cmdstat);
1218 continue;
1219 }
1220 skb->dev = dev;
1221 skb_reserve(skb, 2); /* 16 byte IP header align */
1222 memcpy(skb_put(skb, pkt_len),
1223 &gp->rx_buff[nextOut*PKT_BUF_SZ], pkt_len);
1224 skb->protocol = eth_type_trans(skb, dev);
1225 dump_skb(4, dev, skb);
1226
1227 netif_rx(skb); /* pass the packet to upper layers */
1228 dev->last_rx = jiffies;
1229
1230 // now we can release ownership of this desc back to device
1231 cmdstat |= (u32)rxOwn;
1232 rd->cmdstat = cpu_to_dma32(cmdstat);
1233 }
1234
1235 if (nextOut == gp->rx_next_out)
1236 dbg(3, "%s: RxCDP did not increment?\n", __FUNCTION__);
1237
1238 gp->rx_next_out = nextOut;
1239 return 0;
1240 }
1241
1242
1243 static void
1244 gt96100_tx_complete(struct net_device *dev, u32 status)
1245 {
1246 struct gt96100_private *gp = netdev_priv(dev);
1247 int nextOut, cdp;
1248 gt96100_td_t *td;
1249 u32 cmdstat;
1250
1251 cdp = (GT96100ETH_READ(gp, GT96100_ETH_CURR_TX_DESC_PTR0)
1252 - gp->tx_ring_dma) / sizeof(gt96100_td_t);
1253
1254 // Continue until we reach the current descriptor pointer
1255 for (nextOut = gp->tx_next_out; nextOut != cdp;
1256 nextOut = (nextOut + 1) % TX_RING_SIZE) {
1257
1258 if (--gp->intr_work_done == 0)
1259 break;
1260
1261 td = &gp->tx_ring[nextOut];
1262 cmdstat = dma32_to_cpu(td->cmdstat);
1263
1264 dbg(3, "%s: Tx desc cmdstat=%x, nextOut=%d\n", __FUNCTION__,
1265 cmdstat, nextOut);
1266
1267 if (cmdstat & (u32)txOwn) {
1268 /*
1269 * DMA is not finished writing descriptor???
1270 * Leave and come back later to pick-up where
1271 * we left off.
1272 */
1273 break;
1274 }
1275
1276 // increment Tx error stats
1277 if (cmdstat & (u32)txErrorSummary) {
1278 dbg(2, "%s: Tx error, cmdstat = %x\n", __FUNCTION__,
1279 cmdstat);
1280 gp->stats.tx_errors++;
1281 if (cmdstat & (u32)txReTxLimit)
1282 gp->stats.tx_aborted_errors++;
1283 if (cmdstat & (u32)txUnderrun)
1284 gp->stats.tx_fifo_errors++;
1285 if (cmdstat & (u32)txLateCollision)
1286 gp->stats.tx_window_errors++;
1287 }
1288
1289 if (cmdstat & (u32)txCollision)
1290 gp->stats.collisions +=
1291 (u32)((cmdstat & txReTxCntMask) >>
1292 txReTxCntBit);
1293
1294 // Wake the queue if the ring was full
1295 if (gp->tx_full) {
1296 gp->tx_full = 0;
1297 if (gp->last_psr & psrLink) {
1298 netif_wake_queue(dev);
1299 dbg(2, "%s: Tx Ring was full, queue waked\n",
1300 __FUNCTION__);
1301 }
1302 }
1303
1304 // decrement tx ring buffer count
1305 if (gp->tx_count) gp->tx_count--;
1306
1307 // free the skb
1308 if (gp->tx_skbuff[nextOut]) {
1309 dbg(3, "%s: good Tx, skb=%p\n", __FUNCTION__,
1310 gp->tx_skbuff[nextOut]);
1311 dev_kfree_skb_irq(gp->tx_skbuff[nextOut]);
1312 gp->tx_skbuff[nextOut] = NULL;
1313 } else {
1314 err("%s: no skb!\n", __FUNCTION__);
1315 }
1316 }
1317
1318 gp->tx_next_out = nextOut;
1319
1320 if (gt96100_check_tx_consistent(gp)) {
1321 err("%s: Tx queue inconsistent!\n", __FUNCTION__);
1322 }
1323
1324 if ((status & icrTxEndLow) && gp->tx_count != 0) {
1325 // we must restart the DMA
1326 dbg(3, "%s: Restarting Tx DMA\n", __FUNCTION__);
1327 GT96100ETH_WRITE(gp, GT96100_ETH_SDMA_COMM,
1328 sdcmrERD | sdcmrTXDL);
1329 }
1330 }
1331
1332
1333 static irqreturn_t
1334 gt96100_interrupt(int irq, void *dev_id, struct pt_regs *regs)
1335 {
1336 struct net_device *dev = (struct net_device *)dev_id;
1337 struct gt96100_private *gp = netdev_priv(dev);
1338 u32 status;
1339 int handled = 0;
1340
1341 if (dev == NULL) {
1342 err("%s: null dev ptr\n", __FUNCTION__);
1343 return IRQ_NONE;
1344 }
1345
1346 dbg(3, "%s: entry, icr=%x\n", __FUNCTION__,
1347 GT96100ETH_READ(gp, GT96100_ETH_INT_CAUSE));
1348
1349 spin_lock(&gp->lock);
1350
1351 gp->intr_work_done = max_interrupt_work;
1352
1353 while (gp->intr_work_done > 0) {
1354
1355 status = GT96100ETH_READ(gp, GT96100_ETH_INT_CAUSE);
1356 // ACK interrupts
1357 GT96100ETH_WRITE(gp, GT96100_ETH_INT_CAUSE, ~status);
1358
1359 if ((status & icrEtherIntSum) == 0 &&
1360 !(status & (icrTxBufferLow|icrTxBufferHigh|icrRxBuffer)))
1361 break;
1362
1363 handled = 1;
1364
1365 if (status & icrMIIPhySTC) {
1366 u32 psr = GT96100ETH_READ(gp, GT96100_ETH_PORT_STATUS);
1367 if (gp->last_psr != psr) {
1368 dbg(0, "port status:\n");
1369 dbg(0, " %s MBit/s, %s-duplex, "
1370 "flow-control %s, link is %s,\n",
1371 psr & psrSpeed ? "100":"10",
1372 psr & psrDuplex ? "full":"half",
1373 psr & psrFctl ? "disabled":"enabled",
1374 psr & psrLink ? "up":"down");
1375 dbg(0, " TxLowQ is %s, TxHighQ is %s, "
1376 "Transmitter is %s\n",
1377 psr & psrTxLow ? "running":"stopped",
1378 psr & psrTxHigh ? "running":"stopped",
1379 psr & psrTxInProg ? "on":"off");
1380
1381 if ((psr & psrLink) && !gp->tx_full &&
1382 netif_queue_stopped(dev)) {
1383 dbg(0, "%s: Link up, waking queue.\n",
1384 __FUNCTION__);
1385 netif_wake_queue(dev);
1386 } else if (!(psr & psrLink) &&
1387 !netif_queue_stopped(dev)) {
1388 dbg(0, "%s: Link down, stopping queue.\n",
1389 __FUNCTION__);
1390 netif_stop_queue(dev);
1391 }
1392
1393 gp->last_psr = psr;
1394 }
1395
1396 if (--gp->intr_work_done == 0)
1397 break;
1398 }
1399
1400 if (status & (icrTxBufferLow | icrTxEndLow))
1401 gt96100_tx_complete(dev, status);
1402
1403 if (status & (icrRxBuffer | icrRxError)) {
1404 gt96100_rx(dev, status);
1405 }
1406
1407 // Now check TX errors (RX errors were handled in gt96100_rx)
1408 if (status & icrTxErrorLow) {
1409 err("%s: Tx resource error\n", __FUNCTION__);
1410 if (--gp->intr_work_done == 0)
1411 break;
1412 }
1413
1414 if (status & icrTxUdr) {
1415 err("%s: Tx underrun error\n", __FUNCTION__);
1416 if (--gp->intr_work_done == 0)
1417 break;
1418 }
1419 }
1420
1421 if (gp->intr_work_done == 0) {
1422 // ACK any remaining pending interrupts
1423 GT96100ETH_WRITE(gp, GT96100_ETH_INT_CAUSE, 0);
1424 dbg(3, "%s: hit max work\n", __FUNCTION__);
1425 }
1426
1427 dbg(3, "%s: exit, icr=%x\n", __FUNCTION__,
1428 GT96100ETH_READ(gp, GT96100_ETH_INT_CAUSE));
1429
1430 spin_unlock(&gp->lock);
1431 return IRQ_RETVAL(handled);
1432 }
1433
1434
1435 static void
1436 gt96100_tx_timeout(struct net_device *dev)
1437 {
1438 struct gt96100_private *gp = netdev_priv(dev);
1439 unsigned long flags;
1440
1441 spin_lock_irqsave(&gp->lock, flags);
1442
1443 if (!(gp->last_psr & psrLink)) {
1444 err("tx_timeout: link down.\n");
1445 spin_unlock_irqrestore(&gp->lock, flags);
1446 } else {
1447 if (gt96100_check_tx_consistent(gp))
1448 err("tx_timeout: Tx ring error.\n");
1449
1450 disable_ether_irq(dev);
1451 spin_unlock_irqrestore(&gp->lock, flags);
1452 reset_tx(dev);
1453 enable_ether_irq(dev);
1454
1455 netif_wake_queue(dev);
1456 }
1457 }
1458
1459
1460 static void
1461 gt96100_set_rx_mode(struct net_device *dev)
1462 {
1463 struct gt96100_private *gp = netdev_priv(dev);
1464 unsigned long flags;
1465 //struct dev_mc_list *mcptr;
1466
1467 dbg(3, "%s: dev=%p, flags=%x\n", __FUNCTION__, dev, dev->flags);
1468
1469 // stop the Receiver DMA
1470 abort(dev, sdcmrAR);
1471
1472 spin_lock_irqsave(&gp->lock, flags);
1473
1474 if (dev->flags & IFF_PROMISC) {
1475 GT96100ETH_WRITE(gp, GT96100_ETH_PORT_CONFIG,
1476 pcrEN | pcrHS | pcrPM);
1477 }
1478
1479 #if 0
1480 /*
1481 FIXME: currently multicast doesn't work - need to get hash table
1482 working first.
1483 */
1484 if (dev->mc_count) {
1485 // clear hash table
1486 memset(gp->hash_table, 0, RX_HASH_TABLE_SIZE);
1487 // Add our ethernet address
1488 gt96100_add_hash_entry(dev, dev->dev_addr);
1489
1490 for (mcptr = dev->mc_list; mcptr; mcptr = mcptr->next) {
1491 dump_hw_addr(2, dev, __FUNCTION__ ": addr=",
1492 mcptr->dmi_addr);
1493 gt96100_add_hash_entry(dev, mcptr->dmi_addr);
1494 }
1495 }
1496 #endif
1497
1498 // restart Rx DMA
1499 GT96100ETH_WRITE(gp, GT96100_ETH_SDMA_COMM, sdcmrERD);
1500
1501 spin_unlock_irqrestore(&gp->lock, flags);
1502 }
1503
1504 static struct net_device_stats *
1505 gt96100_get_stats(struct net_device *dev)
1506 {
1507 struct gt96100_private *gp = netdev_priv(dev);
1508 unsigned long flags;
1509
1510 dbg(3, "%s: dev=%p\n", __FUNCTION__, dev);
1511
1512 if (netif_device_present(dev)) {
1513 spin_lock_irqsave (&gp->lock, flags);
1514 update_stats(gp);
1515 spin_unlock_irqrestore (&gp->lock, flags);
1516 }
1517
1518 return &gp->stats;
1519 }
1520
1521 static void gt96100_cleanup_module(void)
1522 {
1523 int i;
1524 for (i=0; i<NUM_INTERFACES; i++) {
1525 struct gt96100_if_t *gtif = &gt96100_iflist[i];
1526 if (gtif->dev != NULL) {
1527 struct gt96100_private *gp = (struct gt96100_private *)
1528 netdev_priv(gtif->dev);
1529 unregister_netdev(gtif->dev);
1530 dmafree(RX_HASH_TABLE_SIZE, gp->hash_table_dma);
1531 dmafree(PKT_BUF_SZ*RX_RING_SIZE, gp->rx_buff);
1532 dmafree(sizeof(gt96100_rd_t) * RX_RING_SIZE
1533 + sizeof(gt96100_td_t) * TX_RING_SIZE,
1534 gp->rx_ring);
1535 free_netdev(gtif->dev);
1536 release_region(gtif->iobase, gp->io_size);
1537 }
1538 }
1539 }
1540
1541 static int __init gt96100_setup(char *options)
1542 {
1543 char *this_opt;
1544
1545 if (!options || !*options)
1546 return 0;
1547
1548 while ((this_opt = strsep (&options, ",")) != NULL) {
1549 if (!*this_opt)
1550 continue;
1551 if (!strncmp(this_opt, "mac0:", 5)) {
1552 memcpy(mac0, this_opt+5, 17);
1553 mac0[17]= '\0';
1554 } else if (!strncmp(this_opt, "mac1:", 5)) {
1555 memcpy(mac1, this_opt+5, 17);
1556 mac1[17]= '\0';
1557 }
1558 }
1559
1560 return 1;
1561 }
1562
1563 __setup("gt96100eth=", gt96100_setup);
1564
1565 module_init(gt96100_init_module);
1566 module_exit(gt96100_cleanup_module);
1567
1568 MODULE_AUTHOR("Steve Longerbeam <stevel@mvista.com>");
1569 MODULE_DESCRIPTION("GT96100 Ethernet driver");
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