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Linux 2.6.17.3
[linux/fpc-iii.git] / drivers / net / gt96100eth.c
blob2d24354046144870370d26c054fea3b6a7e57774
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 update_stats(struct gt96100_private *gp);
76 static void abort(struct net_device *dev, u32 abort_bits);
77 static void hard_stop(struct net_device *dev);
78 static void enable_ether_irq(struct net_device *dev);
79 static void disable_ether_irq(struct net_device *dev);
80 static int gt96100_probe1(struct pci_dev *pci, int port_num);
81 static void reset_tx(struct net_device *dev);
82 static void reset_rx(struct net_device *dev);
83 static int gt96100_check_tx_consistent(struct gt96100_private *gp);
84 static int gt96100_init(struct net_device *dev);
85 static int gt96100_open(struct net_device *dev);
86 static int gt96100_close(struct net_device *dev);
87 static int gt96100_tx(struct sk_buff *skb, struct net_device *dev);
88 static int gt96100_rx(struct net_device *dev, u32 status);
89 static irqreturn_t gt96100_interrupt(int irq, void *dev_id, struct pt_regs *regs);
90 static void gt96100_tx_timeout(struct net_device *dev);
91 static void gt96100_set_rx_mode(struct net_device *dev);
92 static struct net_device_stats* gt96100_get_stats(struct net_device *dev);
93
94 extern char * __init prom_getcmdline(void);
95
96 static int max_interrupt_work = 32;
97
98 #define nibswap(x) ((((x) >> 4) & 0x0f) | (((x) << 4) & 0xf0))
99
100 #define RUN_AT(x) (jiffies + (x))
101
102 // For reading/writing 32-bit words and half-words from/to DMA memory
103 #ifdef DESC_BE
104 #define cpu_to_dma32 cpu_to_be32
105 #define dma32_to_cpu be32_to_cpu
106 #define cpu_to_dma16 cpu_to_be16
107 #define dma16_to_cpu be16_to_cpu
108 #else
109 #define cpu_to_dma32 cpu_to_le32
110 #define dma32_to_cpu le32_to_cpu
111 #define cpu_to_dma16 cpu_to_le16
112 #define dma16_to_cpu le16_to_cpu
113 #endif
114
115 static char mac0[18] = "00.02.03.04.05.06";
116 static char mac1[18] = "00.01.02.03.04.05";
117 module_param_string(mac0, mac0, 18, 0);
118 module_param_string(mac1, mac0, 18, 0);
119 MODULE_PARM_DESC(mac0, "MAC address for GT96100 ethernet port 0");
120 MODULE_PARM_DESC(mac1, "MAC address for GT96100 ethernet port 1");
121
122 /*
123 * Info for the GT96100 ethernet controller's ports.
124 */
125 static struct gt96100_if_t {
126 struct net_device *dev;
127 unsigned int iobase; // IO Base address of this port
128 int irq; // IRQ number of this port
129 char *mac_str;
130 } gt96100_iflist[NUM_INTERFACES] = {
131 {
132 NULL,
133 GT96100_ETH0_BASE, GT96100_ETHER0_IRQ,
134 mac0
135 },
136 {
137 NULL,
138 GT96100_ETH1_BASE, GT96100_ETHER1_IRQ,
139 mac1
140 }
141 };
142
143 static inline const char*
144 chip_name(int chip_rev)
145 {
146 switch (chip_rev) {
147 case REV_GT96100:
148 return "GT96100";
149 case REV_GT96100A_1:
150 case REV_GT96100A:
151 return "GT96100A";
152 default:
153 return "Unknown GT96100";
154 }
155 }
156
157 /*
158 DMA memory allocation, derived from pci_alloc_consistent.
159 */
160 static void * dmaalloc(size_t size, dma_addr_t *dma_handle)
161 {
162 void *ret;
163
164 ret = (void *)__get_free_pages(GFP_ATOMIC | GFP_DMA, get_order(size));
165
166 if (ret != NULL) {
167 dma_cache_inv((unsigned long)ret, size);
168 if (dma_handle != NULL)
169 *dma_handle = virt_to_phys(ret);
170
171 /* bump virtual address up to non-cached area */
172 ret = (void*)KSEG1ADDR(ret);
173 }
174
175 return ret;
176 }
177
178 static void dmafree(size_t size, void *vaddr)
179 {
180 vaddr = (void*)KSEG0ADDR(vaddr);
181 free_pages((unsigned long)vaddr, get_order(size));
182 }
183
184 static void gt96100_delay(int ms)
185 {
186 if (in_interrupt())
187 return;
188 else
189 msleep_interruptible(ms);
190 }
191
192 static int
193 parse_mac_addr(struct net_device *dev, char* macstr)
194 {
195 int i, j;
196 unsigned char result, value;
197
198 for (i=0; i<6; i++) {
199 result = 0;
200 if (i != 5 && *(macstr+2) != '.') {
201 err(__FILE__ "invalid mac address format: %d %c\n",
202 i, *(macstr+2));
203 return -EINVAL;
204 }
205
206 for (j=0; j<2; j++) {
207 if (isxdigit(*macstr) &&
208 (value = isdigit(*macstr) ? *macstr-'0' :
209 toupper(*macstr)-'A'+10) < 16) {
210 result = result*16 + value;
211 macstr++;
212 } else {
213 err(__FILE__ "invalid mac address "
214 "character: %c\n", *macstr);
215 return -EINVAL;
216 }
217 }
218
219 macstr++; // step over '.'
220 dev->dev_addr[i] = result;
221 }
222
223 return 0;
224 }
225
226
227 static int
228 read_MII(int phy_addr, u32 reg)
229 {
230 int timedout = 20;
231 u32 smir = smirOpCode | (phy_addr << smirPhyAdBit) |
232 (reg << smirRegAdBit);
233
234 // wait for last operation to complete
235 while (GT96100_READ(GT96100_ETH_SMI_REG) & smirBusy) {
236 // snooze for 1 msec and check again
237 gt96100_delay(1);
238
239 if (--timedout == 0) {
240 printk(KERN_ERR "%s: busy timeout!!\n", __FUNCTION__);
241 return -ENODEV;
242 }
243 }
244
245 GT96100_WRITE(GT96100_ETH_SMI_REG, smir);
246
247 timedout = 20;
248 // wait for read to complete
249 while (!((smir = GT96100_READ(GT96100_ETH_SMI_REG)) & smirReadValid)) {
250 // snooze for 1 msec and check again
251 gt96100_delay(1);
252
253 if (--timedout == 0) {
254 printk(KERN_ERR "%s: timeout!!\n", __FUNCTION__);
255 return -ENODEV;
256 }
257 }
258
259 return (int)(smir & smirDataMask);
260 }
261
262 static void
263 dump_tx_desc(int dbg_lvl, struct net_device *dev, int i)
264 {
265 struct gt96100_private *gp = netdev_priv(dev);
266 gt96100_td_t *td = &gp->tx_ring[i];
267
268 dbg(dbg_lvl, "Tx descriptor at 0x%08lx:\n", virt_to_phys(td));
269 dbg(dbg_lvl,
270 " cmdstat=%04x, byte_cnt=%04x, buff_ptr=%04x, next=%04x\n",
271 dma32_to_cpu(td->cmdstat),
272 dma16_to_cpu(td->byte_cnt),
273 dma32_to_cpu(td->buff_ptr),
274 dma32_to_cpu(td->next));
275 }
276
277 static void
278 dump_rx_desc(int dbg_lvl, struct net_device *dev, int i)
279 {
280 struct gt96100_private *gp = netdev_priv(dev);
281 gt96100_rd_t *rd = &gp->rx_ring[i];
282
283 dbg(dbg_lvl, "Rx descriptor at 0x%08lx:\n", virt_to_phys(rd));
284 dbg(dbg_lvl, " cmdstat=%04x, buff_sz=%04x, byte_cnt=%04x, "
285 "buff_ptr=%04x, next=%04x\n",
286 dma32_to_cpu(rd->cmdstat),
287 dma16_to_cpu(rd->buff_sz),
288 dma16_to_cpu(rd->byte_cnt),
289 dma32_to_cpu(rd->buff_ptr),
290 dma32_to_cpu(rd->next));
291 }
292
293 static int
294 write_MII(int phy_addr, u32 reg, u16 data)
295 {
296 int timedout = 20;
297 u32 smir = (phy_addr << smirPhyAdBit) |
298 (reg << smirRegAdBit) | data;
299
300 // wait for last operation to complete
301 while (GT96100_READ(GT96100_ETH_SMI_REG) & smirBusy) {
302 // snooze for 1 msec and check again
303 gt96100_delay(1);
304
305 if (--timedout == 0) {
306 printk(KERN_ERR "%s: busy timeout!!\n", __FUNCTION__);
307 return -1;
308 }
309 }
310
311 GT96100_WRITE(GT96100_ETH_SMI_REG, smir);
312 return 0;
313 }
314
315 static void
316 dump_MII(int dbg_lvl, struct net_device *dev)
317 {
318 int i, val;
319 struct gt96100_private *gp = netdev_priv(dev);
320
321 if (dbg_lvl <= GT96100_DEBUG) {
322 for (i=0; i<7; i++) {
323 if ((val = read_MII(gp->phy_addr, i)) >= 0)
324 printk("MII Reg %d=%x\n", i, val);
325 }
326 for (i=16; i<21; i++) {
327 if ((val = read_MII(gp->phy_addr, i)) >= 0)
328 printk("MII Reg %d=%x\n", i, val);
329 }
330 }
331 }
332
333 static void
334 dump_hw_addr(int dbg_lvl, struct net_device *dev, const char* pfx,
335 const char* func, unsigned char* addr_str)
336 {
337 int i;
338 char buf[100], octet[5];
339
340 if (dbg_lvl <= GT96100_DEBUG) {
341 sprintf(buf, pfx, func);
342 for (i = 0; i < 6; i++) {
343 sprintf(octet, "%2.2x%s",
344 addr_str[i], i<5 ? ":" : "\n");
345 strcat(buf, octet);
346 }
347 info("%s", buf);
348 }
349 }
350
351
352 static void
353 dump_skb(int dbg_lvl, struct net_device *dev, struct sk_buff *skb)
354 {
355 int i;
356 unsigned char* skbdata;
357
358 if (dbg_lvl <= GT96100_DEBUG) {
359 dbg(dbg_lvl, "%s: skb=%p, skb->data=%p, skb->len=%d\n",
360 __FUNCTION__, skb, skb->data, skb->len);
361
362 skbdata = (unsigned char*)KSEG1ADDR(skb->data);
363
364 for (i=0; i<skb->len; i++) {
365 if (!(i % 16))
366 printk(KERN_DEBUG "\n %3.3x: %2.2x,",
367 i, skbdata[i]);
368 else
369 printk(KERN_DEBUG "%2.2x,", skbdata[i]);
370 }
371 printk(KERN_DEBUG "\n");
372 }
373 }
374
375
376 static int
377 gt96100_add_hash_entry(struct net_device *dev, unsigned char* addr)
378 {
379 struct gt96100_private *gp = netdev_priv(dev);
380 //u16 hashResult, stmp;
381 //unsigned char ctmp, hash_ea[6];
382 u32 tblEntry1, tblEntry0, *tblEntryAddr;
383 int i;
384
385 tblEntry1 = hteValid | hteRD;
386 tblEntry1 |= (u32)addr[5] << 3;
387 tblEntry1 |= (u32)addr[4] << 11;
388 tblEntry1 |= (u32)addr[3] << 19;
389 tblEntry1 |= ((u32)addr[2] & 0x1f) << 27;
390 dbg(3, "%s: tblEntry1=%x\n", __FUNCTION__, tblEntry1);
391 tblEntry0 = ((u32)addr[2] >> 5) & 0x07;
392 tblEntry0 |= (u32)addr[1] << 3;
393 tblEntry0 |= (u32)addr[0] << 11;
394 dbg(3, "%s: tblEntry0=%x\n", __FUNCTION__, tblEntry0);
395
396 #if 0
397
398 for (i=0; i<6; i++) {
399 // nibble swap
400 ctmp = nibswap(addr[i]);
401 // invert every nibble
402 hash_ea[i] = ((ctmp&1)<<3) | ((ctmp&8)>>3) |
403 ((ctmp&2)<<1) | ((ctmp&4)>>1);
404 hash_ea[i] |= ((ctmp&0x10)<<3) | ((ctmp&0x80)>>3) |
405 ((ctmp&0x20)<<1) | ((ctmp&0x40)>>1);
406 }
407
408 dump_hw_addr(3, dev, "%s: nib swap/invt addr=", __FUNCTION__, hash_ea);
409
410 if (gp->hash_mode == 0) {
411 hashResult = ((u16)hash_ea[0] & 0xfc) << 7;
412 stmp = ((u16)hash_ea[0] & 0x03) |
413 (((u16)hash_ea[1] & 0x7f) << 2);
414 stmp ^= (((u16)hash_ea[1] >> 7) & 0x01) |
415 ((u16)hash_ea[2] << 1);
416 stmp ^= (u16)hash_ea[3] | (((u16)hash_ea[4] & 1) << 8);
417 hashResult |= stmp;
418 } else {
419 return -1; // don't support hash mode 1
420 }
421
422 dbg(3, "%s: hashResult=%x\n", __FUNCTION__, hashResult);
423
424 tblEntryAddr =
425 (u32 *)(&gp->hash_table[((u32)hashResult & 0x7ff) << 3]);
426
427 dbg(3, "%s: tblEntryAddr=%p\n", tblEntryAddr, __FUNCTION__);
428
429 for (i=0; i<HASH_HOP_NUMBER; i++) {
430 if ((*tblEntryAddr & hteValid) &&
431 !(*tblEntryAddr & hteSkip)) {
432 // This entry is already occupied, go to next entry
433 tblEntryAddr += 2;
434 dbg(3, "%s: skipping to %p\n", __FUNCTION__,
435 tblEntryAddr);
436 } else {
437 memset(tblEntryAddr, 0, 8);
438 tblEntryAddr[1] = cpu_to_dma32(tblEntry1);
439 tblEntryAddr[0] = cpu_to_dma32(tblEntry0);
440 break;
441 }
442 }
443
444 if (i >= HASH_HOP_NUMBER) {
445 err("%s: expired!\n", __FUNCTION__);
446 return -1; // Couldn't find an unused entry
447 }
448
449 #else
450
451 tblEntryAddr = (u32 *)gp->hash_table;
452 for (i=0; i<RX_HASH_TABLE_SIZE/4; i+=2) {
453 tblEntryAddr[i+1] = cpu_to_dma32(tblEntry1);
454 tblEntryAddr[i] = cpu_to_dma32(tblEntry0);
455 }
456
457 #endif
458
459 return 0;
460 }
461
462
463 static void
464 read_mib_counters(struct gt96100_private *gp)
465 {
466 u32* mib_regs = (u32*)&gp->mib;
467 int i;
468
469 for (i=0; i<sizeof(mib_counters_t)/sizeof(u32); i++)
470 mib_regs[i] = GT96100ETH_READ(gp, GT96100_ETH_MIB_COUNT_BASE +
471 i*sizeof(u32));
472 }
473
474
475 static void
476 update_stats(struct gt96100_private *gp)
477 {
478 mib_counters_t *mib = &gp->mib;
479 struct net_device_stats *stats = &gp->stats;
480
481 read_mib_counters(gp);
482
483 stats->rx_packets = mib->totalFramesReceived;
484 stats->tx_packets = mib->framesSent;
485 stats->rx_bytes = mib->totalByteReceived;
486 stats->tx_bytes = mib->byteSent;
487 stats->rx_errors = mib->totalFramesReceived - mib->framesReceived;
488 //the tx error counters are incremented by the ISR
489 //rx_dropped incremented by gt96100_rx
490 //tx_dropped incremented by gt96100_tx
491 stats->multicast = mib->multicastFramesReceived;
492 // collisions incremented by gt96100_tx_complete
493 stats->rx_length_errors = mib->oversizeFrames + mib->fragments;
494 // The RxError condition means the Rx DMA encountered a
495 // CPU owned descriptor, which, if things are working as
496 // they should, means the Rx ring has overflowed.
497 stats->rx_over_errors = mib->macRxError;
498 stats->rx_crc_errors = mib->cRCError;
499 }
500
501 static void
502 abort(struct net_device *dev, u32 abort_bits)
503 {
504 struct gt96100_private *gp = netdev_priv(dev);
505 int timedout = 100; // wait up to 100 msec for hard stop to complete
506
507 dbg(3, "%s\n", __FUNCTION__);
508
509 // Return if neither Rx or Tx abort bits are set
510 if (!(abort_bits & (sdcmrAR | sdcmrAT)))
511 return;
512
513 // make sure only the Rx/Tx abort bits are set
514 abort_bits &= (sdcmrAR | sdcmrAT);
515
516 spin_lock(&gp->lock);
517
518 // abort any Rx/Tx DMA immediately
519 GT96100ETH_WRITE(gp, GT96100_ETH_SDMA_COMM, abort_bits);
520
521 dbg(3, "%s: SDMA comm = %x\n", __FUNCTION__,
522 GT96100ETH_READ(gp, GT96100_ETH_SDMA_COMM));
523
524 // wait for abort to complete
525 while (GT96100ETH_READ(gp, GT96100_ETH_SDMA_COMM) & abort_bits) {
526 // snooze for 1 msec and check again
527 gt96100_delay(1);
528
529 if (--timedout == 0) {
530 err("%s: timeout!!\n", __FUNCTION__);
531 break;
532 }
533 }
534
535 spin_unlock(&gp->lock);
536 }
537
538
539 static void
540 hard_stop(struct net_device *dev)
541 {
542 struct gt96100_private *gp = netdev_priv(dev);
543
544 dbg(3, "%s\n", __FUNCTION__);
545
546 disable_ether_irq(dev);
547
548 abort(dev, sdcmrAR | sdcmrAT);
549
550 // disable port
551 GT96100ETH_WRITE(gp, GT96100_ETH_PORT_CONFIG, 0);
552 }
553
554
555 static void
556 enable_ether_irq(struct net_device *dev)
557 {
558 struct gt96100_private *gp = netdev_priv(dev);
559 u32 intMask;
560 /*
561 * route ethernet interrupt to GT_SERINT0 for port 0,
562 * GT_INT0 for port 1.
563 */
564 int intr_mask_reg = (gp->port_num == 0) ?
565 GT96100_SERINT0_MASK : GT96100_INT0_HIGH_MASK;
566
567 if (gp->chip_rev >= REV_GT96100A_1) {
568 intMask = icrTxBufferLow | icrTxEndLow |
569 icrTxErrorLow | icrRxOVR | icrTxUdr |
570 icrRxBufferQ0 | icrRxErrorQ0 |
571 icrMIIPhySTC | icrEtherIntSum;
572 }
573 else {
574 intMask = icrTxBufferLow | icrTxEndLow |
575 icrTxErrorLow | icrRxOVR | icrTxUdr |
576 icrRxBuffer | icrRxError |
577 icrMIIPhySTC | icrEtherIntSum;
578 }
579
580 // unmask interrupts
581 GT96100ETH_WRITE(gp, GT96100_ETH_INT_MASK, intMask);
582
583 intMask = GT96100_READ(intr_mask_reg);
584 intMask |= 1<<gp->port_num;
585 GT96100_WRITE(intr_mask_reg, intMask);
586 }
587
588 static void
589 disable_ether_irq(struct net_device *dev)
590 {
591 struct gt96100_private *gp = netdev_priv(dev);
592 u32 intMask;
593 int intr_mask_reg = (gp->port_num == 0) ?
594 GT96100_SERINT0_MASK : GT96100_INT0_HIGH_MASK;
595
596 intMask = GT96100_READ(intr_mask_reg);
597 intMask &= ~(1<<gp->port_num);
598 GT96100_WRITE(intr_mask_reg, intMask);
599
600 GT96100ETH_WRITE(gp, GT96100_ETH_INT_MASK, 0);
601 }
602
603
604 /*
605 * Init GT96100 ethernet controller driver
606 */
607 static int gt96100_init_module(void)
608 {
609 struct pci_dev *pci;
610 int i, retval=0;
611 u32 cpuConfig;
612
613 /*
614 * Stupid probe because this really isn't a PCI device
615 */
616 if (!(pci = pci_find_device(PCI_VENDOR_ID_MARVELL,
617 PCI_DEVICE_ID_MARVELL_GT96100, NULL)) &&
618 !(pci = pci_find_device(PCI_VENDOR_ID_MARVELL,
619 PCI_DEVICE_ID_MARVELL_GT96100A, NULL))) {
620 printk(KERN_ERR __FILE__ ": GT96100 not found!\n");
621 return -ENODEV;
622 }
623
624 cpuConfig = GT96100_READ(GT96100_CPU_INTERF_CONFIG);
625 if (cpuConfig & (1<<12)) {
626 printk(KERN_ERR __FILE__
627 ": must be in Big Endian mode!\n");
628 return -ENODEV;
629 }
630
631 for (i=0; i < NUM_INTERFACES; i++)
632 retval |= gt96100_probe1(pci, i);
633
634 return retval;
635 }
636
637 static int __init gt96100_probe1(struct pci_dev *pci, int port_num)
638 {
639 struct gt96100_private *gp = NULL;
640 struct gt96100_if_t *gtif = &gt96100_iflist[port_num];
641 int phy_addr, phy_id1, phy_id2;
642 u32 phyAD;
643 int retval;
644 unsigned char chip_rev;
645 struct net_device *dev = NULL;
646
647 if (gtif->irq < 0) {
648 printk(KERN_ERR "%s: irq unknown - probing not supported\n",
649 __FUNCTION__);
650 return -ENODEV;
651 }
652
653 pci_read_config_byte(pci, PCI_REVISION_ID, &chip_rev);
654
655 if (chip_rev >= REV_GT96100A_1) {
656 phyAD = GT96100_READ(GT96100_ETH_PHY_ADDR_REG);
657 phy_addr = (phyAD >> (5*port_num)) & 0x1f;
658 } else {
659 /*
660 * not sure what's this about -- probably a gt bug
661 */
662 phy_addr = port_num;
663 phyAD = GT96100_READ(GT96100_ETH_PHY_ADDR_REG);
664 phyAD &= ~(0x1f << (port_num*5));
665 phyAD |= phy_addr << (port_num*5);
666 GT96100_WRITE(GT96100_ETH_PHY_ADDR_REG, phyAD);
667 }
668
669 // probe for the external PHY
670 if ((phy_id1 = read_MII(phy_addr, 2)) <= 0 ||
671 (phy_id2 = read_MII(phy_addr, 3)) <= 0) {
672 printk(KERN_ERR "%s: no PHY found on MII%d\n", __FUNCTION__, port_num);
673 return -ENODEV;
674 }
675
676 if (!request_region(gtif->iobase, GT96100_ETH_IO_SIZE, "GT96100ETH")) {
677 printk(KERN_ERR "%s: request_region failed\n", __FUNCTION__);
678 return -EBUSY;
679 }
680
681 dev = alloc_etherdev(sizeof(struct gt96100_private));
682 if (!dev)
683 goto out;
684 gtif->dev = dev;
685
686 /* private struct aligned and zeroed by alloc_etherdev */
687 /* Fill in the 'dev' fields. */
688 dev->base_addr = gtif->iobase;
689 dev->irq = gtif->irq;
690
691 if ((retval = parse_mac_addr(dev, gtif->mac_str))) {
692 err("%s: MAC address parse failed\n", __FUNCTION__);
693 retval = -EINVAL;
694 goto out1;
695 }
696
697 gp = netdev_priv(dev);
698
699 memset(gp, 0, sizeof(*gp)); // clear it
700
701 gp->port_num = port_num;
702 gp->io_size = GT96100_ETH_IO_SIZE;
703 gp->port_offset = port_num * GT96100_ETH_IO_SIZE;
704 gp->phy_addr = phy_addr;
705 gp->chip_rev = chip_rev;
706
707 info("%s found at 0x%x, irq %d\n",
708 chip_name(gp->chip_rev), gtif->iobase, gtif->irq);
709 dump_hw_addr(0, dev, "%s: HW Address ", __FUNCTION__, dev->dev_addr);
710 info("%s chip revision=%d\n", chip_name(gp->chip_rev), gp->chip_rev);
711 info("%s ethernet port %d\n", chip_name(gp->chip_rev), gp->port_num);
712 info("external PHY ID1=0x%04x, ID2=0x%04x\n", phy_id1, phy_id2);
713
714 // Allocate Rx and Tx descriptor rings
715 if (gp->rx_ring == NULL) {
716 // All descriptors in ring must be 16-byte aligned
717 gp->rx_ring = dmaalloc(sizeof(gt96100_rd_t) * RX_RING_SIZE
718 + sizeof(gt96100_td_t) * TX_RING_SIZE,
719 &gp->rx_ring_dma);
720 if (gp->rx_ring == NULL) {
721 retval = -ENOMEM;
722 goto out1;
723 }
724
725 gp->tx_ring = (gt96100_td_t *)(gp->rx_ring + RX_RING_SIZE);
726 gp->tx_ring_dma =
727 gp->rx_ring_dma + sizeof(gt96100_rd_t) * RX_RING_SIZE;
728 }
729
730 // Allocate the Rx Data Buffers
731 if (gp->rx_buff == NULL) {
732 gp->rx_buff = dmaalloc(PKT_BUF_SZ*RX_RING_SIZE,
733 &gp->rx_buff_dma);
734 if (gp->rx_buff == NULL) {
735 retval = -ENOMEM;
736 goto out2;
737 }
738 }
739
740 dbg(3, "%s: rx_ring=%p, tx_ring=%p\n", __FUNCTION__,
741 gp->rx_ring, gp->tx_ring);
742
743 // Allocate Rx Hash Table
744 if (gp->hash_table == NULL) {
745 gp->hash_table = (char*)dmaalloc(RX_HASH_TABLE_SIZE,
746 &gp->hash_table_dma);
747 if (gp->hash_table == NULL) {
748 retval = -ENOMEM;
749 goto out3;
750 }
751 }
752
753 dbg(3, "%s: hash=%p\n", __FUNCTION__, gp->hash_table);
754
755 spin_lock_init(&gp->lock);
756
757 dev->open = gt96100_open;
758 dev->hard_start_xmit = gt96100_tx;
759 dev->stop = gt96100_close;
760 dev->get_stats = gt96100_get_stats;
761 //dev->do_ioctl = gt96100_ioctl;
762 dev->set_multicast_list = gt96100_set_rx_mode;
763 dev->tx_timeout = gt96100_tx_timeout;
764 dev->watchdog_timeo = GT96100ETH_TX_TIMEOUT;
765
766 retval = register_netdev(dev);
767 if (retval)
768 goto out4;
769 return 0;
770
771 out4:
772 dmafree(RX_HASH_TABLE_SIZE, gp->hash_table_dma);
773 out3:
774 dmafree(PKT_BUF_SZ*RX_RING_SIZE, gp->rx_buff);
775 out2:
776 dmafree(sizeof(gt96100_rd_t) * RX_RING_SIZE
777 + sizeof(gt96100_td_t) * TX_RING_SIZE,
778 gp->rx_ring);
779 out1:
780 free_netdev (dev);
781 out:
782 release_region(gtif->iobase, GT96100_ETH_IO_SIZE);
783
784 err("%s failed. Returns %d\n", __FUNCTION__, retval);
785 return retval;
786 }
787
788
789 static void
790 reset_tx(struct net_device *dev)
791 {
792 struct gt96100_private *gp = netdev_priv(dev);
793 int i;
794
795 abort(dev, sdcmrAT);
796
797 for (i=0; i<TX_RING_SIZE; i++) {
798 if (gp->tx_skbuff[i]) {
799 if (in_interrupt())
800 dev_kfree_skb_irq(gp->tx_skbuff[i]);
801 else
802 dev_kfree_skb(gp->tx_skbuff[i]);
803 gp->tx_skbuff[i] = NULL;
804 }
805
806 gp->tx_ring[i].cmdstat = 0; // CPU owns
807 gp->tx_ring[i].byte_cnt = 0;
808 gp->tx_ring[i].buff_ptr = 0;
809 gp->tx_ring[i].next =
810 cpu_to_dma32(gp->tx_ring_dma +
811 sizeof(gt96100_td_t) * (i+1));
812 dump_tx_desc(4, dev, i);
813 }
814 /* Wrap the ring. */
815 gp->tx_ring[i-1].next = cpu_to_dma32(gp->tx_ring_dma);
816
817 // setup only the lowest priority TxCDP reg
818 GT96100ETH_WRITE(gp, GT96100_ETH_CURR_TX_DESC_PTR0, gp->tx_ring_dma);
819 GT96100ETH_WRITE(gp, GT96100_ETH_CURR_TX_DESC_PTR1, 0);
820
821 // init Tx indeces and pkt counter
822 gp->tx_next_in = gp->tx_next_out = 0;
823 gp->tx_count = 0;
824
825 }
826
827 static void
828 reset_rx(struct net_device *dev)
829 {
830 struct gt96100_private *gp = netdev_priv(dev);
831 int i;
832
833 abort(dev, sdcmrAR);
834
835 for (i=0; i<RX_RING_SIZE; i++) {
836 gp->rx_ring[i].next =
837 cpu_to_dma32(gp->rx_ring_dma +
838 sizeof(gt96100_rd_t) * (i+1));
839 gp->rx_ring[i].buff_ptr =
840 cpu_to_dma32(gp->rx_buff_dma + i*PKT_BUF_SZ);
841 gp->rx_ring[i].buff_sz = cpu_to_dma16(PKT_BUF_SZ);
842 // Give ownership to device, set first and last, enable intr
843 gp->rx_ring[i].cmdstat =
844 cpu_to_dma32((u32)(rxFirst | rxLast | rxOwn | rxEI));
845 dump_rx_desc(4, dev, i);
846 }
847 /* Wrap the ring. */
848 gp->rx_ring[i-1].next = cpu_to_dma32(gp->rx_ring_dma);
849
850 // Setup only the lowest priority RxFDP and RxCDP regs
851 for (i=0; i<4; i++) {
852 if (i == 0) {
853 GT96100ETH_WRITE(gp, GT96100_ETH_1ST_RX_DESC_PTR0,
854 gp->rx_ring_dma);
855 GT96100ETH_WRITE(gp, GT96100_ETH_CURR_RX_DESC_PTR0,
856 gp->rx_ring_dma);
857 } else {
858 GT96100ETH_WRITE(gp,
859 GT96100_ETH_1ST_RX_DESC_PTR0 + i*4,
860 0);
861 GT96100ETH_WRITE(gp,
862 GT96100_ETH_CURR_RX_DESC_PTR0 + i*4,
863 0);
864 }
865 }
866
867 // init Rx NextOut index
868 gp->rx_next_out = 0;
869 }
870
871
872 // Returns 1 if the Tx counter and indeces don't gel
873 static int
874 gt96100_check_tx_consistent(struct gt96100_private *gp)
875 {
876 int diff = gp->tx_next_in - gp->tx_next_out;
877
878 diff = diff<0 ? TX_RING_SIZE + diff : diff;
879 diff = gp->tx_count == TX_RING_SIZE ? diff + TX_RING_SIZE : diff;
880
881 return (diff != gp->tx_count);
882 }
883
884 static int
885 gt96100_init(struct net_device *dev)
886 {
887 struct gt96100_private *gp = netdev_priv(dev);
888 u32 tmp;
889 u16 mii_reg;
890
891 dbg(3, "%s: dev=%p\n", __FUNCTION__, dev);
892 dbg(3, "%s: scs10_lo=%4x, scs10_hi=%4x\n", __FUNCTION__,
893 GT96100_READ(0x8), GT96100_READ(0x10));
894 dbg(3, "%s: scs32_lo=%4x, scs32_hi=%4x\n", __FUNCTION__,
895 GT96100_READ(0x18), GT96100_READ(0x20));
896
897 // Stop and disable Port
898 hard_stop(dev);
899
900 // Setup CIU Arbiter
901 tmp = GT96100_READ(GT96100_CIU_ARBITER_CONFIG);
902 tmp |= (0x0c << (gp->port_num*2)); // set Ether DMA req priority to hi
903 #ifndef DESC_BE
904 tmp &= ~(1<<31); // set desc endianess to little
905 #else
906 tmp |= (1<<31);
907 #endif
908 GT96100_WRITE(GT96100_CIU_ARBITER_CONFIG, tmp);
909 dbg(3, "%s: CIU Config=%x/%x\n", __FUNCTION__,
910 tmp, GT96100_READ(GT96100_CIU_ARBITER_CONFIG));
911
912 // Set routing.
913 tmp = GT96100_READ(GT96100_ROUTE_MAIN) & (0x3f << 18);
914 tmp |= (0x07 << (18 + gp->port_num*3));
915 GT96100_WRITE(GT96100_ROUTE_MAIN, tmp);
916
917 /* set MII as peripheral func */
918 tmp = GT96100_READ(GT96100_GPP_CONFIG2);
919 tmp |= 0x7fff << (gp->port_num*16);
920 GT96100_WRITE(GT96100_GPP_CONFIG2, tmp);
921
922 /* Set up MII port pin directions */
923 tmp = GT96100_READ(GT96100_GPP_IO2);
924 tmp |= 0x003d << (gp->port_num*16);
925 GT96100_WRITE(GT96100_GPP_IO2, tmp);
926
927 // Set-up hash table
928 memset(gp->hash_table, 0, RX_HASH_TABLE_SIZE); // clear it
929 gp->hash_mode = 0;
930 // Add a single entry to hash table - our ethernet address
931 gt96100_add_hash_entry(dev, dev->dev_addr);
932 // Set-up DMA ptr to hash table
933 GT96100ETH_WRITE(gp, GT96100_ETH_HASH_TBL_PTR, gp->hash_table_dma);
934 dbg(3, "%s: Hash Tbl Ptr=%x\n", __FUNCTION__,
935 GT96100ETH_READ(gp, GT96100_ETH_HASH_TBL_PTR));
936
937 // Setup Tx
938 reset_tx(dev);
939
940 dbg(3, "%s: Curr Tx Desc Ptr0=%x\n", __FUNCTION__,
941 GT96100ETH_READ(gp, GT96100_ETH_CURR_TX_DESC_PTR0));
942
943 // Setup Rx
944 reset_rx(dev);
945
946 dbg(3, "%s: 1st/Curr Rx Desc Ptr0=%x/%x\n", __FUNCTION__,
947 GT96100ETH_READ(gp, GT96100_ETH_1ST_RX_DESC_PTR0),
948 GT96100ETH_READ(gp, GT96100_ETH_CURR_RX_DESC_PTR0));
949
950 // eth port config register
951 GT96100ETH_WRITE(gp, GT96100_ETH_PORT_CONFIG_EXT,
952 pcxrFCTL | pcxrFCTLen | pcxrFLP | pcxrDPLXen);
953
954 mii_reg = read_MII(gp->phy_addr, 0x11); /* int enable register */
955 mii_reg |= 2; /* enable mii interrupt */
956 write_MII(gp->phy_addr, 0x11, mii_reg);
957
958 dbg(3, "%s: PhyAD=%x\n", __FUNCTION__,
959 GT96100_READ(GT96100_ETH_PHY_ADDR_REG));
960
961 // setup DMA
962
963 // We want the Rx/Tx DMA to write/read data to/from memory in
964 // Big Endian mode. Also set DMA Burst Size to 8 64Bit words.
965 #ifdef DESC_DATA_BE
966 GT96100ETH_WRITE(gp, GT96100_ETH_SDMA_CONFIG,
967 (0xf<<sdcrRCBit) | sdcrRIFB | (3<<sdcrBSZBit));
968 #else
969 GT96100ETH_WRITE(gp, GT96100_ETH_SDMA_CONFIG,
970 sdcrBLMR | sdcrBLMT |
971 (0xf<<sdcrRCBit) | sdcrRIFB | (3<<sdcrBSZBit));
972 #endif
973 dbg(3, "%s: SDMA Config=%x\n", __FUNCTION__,
974 GT96100ETH_READ(gp, GT96100_ETH_SDMA_CONFIG));
975
976 // start Rx DMA
977 GT96100ETH_WRITE(gp, GT96100_ETH_SDMA_COMM, sdcmrERD);
978 dbg(3, "%s: SDMA Comm=%x\n", __FUNCTION__,
979 GT96100ETH_READ(gp, GT96100_ETH_SDMA_COMM));
980
981 // enable this port (set hash size to 1/2K)
982 GT96100ETH_WRITE(gp, GT96100_ETH_PORT_CONFIG, pcrEN | pcrHS);
983 dbg(3, "%s: Port Config=%x\n", __FUNCTION__,
984 GT96100ETH_READ(gp, GT96100_ETH_PORT_CONFIG));
985
986 /*
987 * Disable all Type-of-Service queueing. All Rx packets will be
988 * treated normally and will be sent to the lowest priority
989 * queue.
990 *
991 * Disable flow-control for now. FIXME: support flow control?
992 */
993
994 // clear all the MIB ctr regs
995 GT96100ETH_WRITE(gp, GT96100_ETH_PORT_CONFIG_EXT,
996 pcxrFCTL | pcxrFCTLen | pcxrFLP |
997 pcxrPRIOrxOverride);
998 read_mib_counters(gp);
999 GT96100ETH_WRITE(gp, GT96100_ETH_PORT_CONFIG_EXT,
1000 pcxrFCTL | pcxrFCTLen | pcxrFLP |
1001 pcxrPRIOrxOverride | pcxrMIBclrMode);
1002
1003 dbg(3, "%s: Port Config Ext=%x\n", __FUNCTION__,
1004 GT96100ETH_READ(gp, GT96100_ETH_PORT_CONFIG_EXT));
1005
1006 netif_start_queue(dev);
1007
1008 dump_MII(4, dev);
1009
1010 // enable interrupts
1011 enable_ether_irq(dev);
1012
1013 // we should now be receiving frames
1014 return 0;
1015 }
1016
1017
1018 static int
1019 gt96100_open(struct net_device *dev)
1020 {
1021 int retval;
1022
1023 dbg(2, "%s: dev=%p\n", __FUNCTION__, dev);
1024
1025 // Initialize and startup the GT-96100 ethernet port
1026 if ((retval = gt96100_init(dev))) {
1027 err("error in gt96100_init\n");
1028 free_irq(dev->irq, dev);
1029 return retval;
1030 }
1031
1032 if ((retval = request_irq(dev->irq, &gt96100_interrupt,
1033 SA_SHIRQ, dev->name, dev))) {
1034 err("unable to get IRQ %d\n", dev->irq);
1035 return retval;
1036 }
1037
1038 dbg(2, "%s: Initialization done.\n", __FUNCTION__);
1039
1040 return 0;
1041 }
1042
1043 static int
1044 gt96100_close(struct net_device *dev)
1045 {
1046 dbg(3, "%s: dev=%p\n", __FUNCTION__, dev);
1047
1048 // stop the device
1049 if (netif_device_present(dev)) {
1050 netif_stop_queue(dev);
1051 hard_stop(dev);
1052 }
1053
1054 free_irq(dev->irq, dev);
1055
1056 return 0;
1057 }
1058
1059
1060 static int
1061 gt96100_tx(struct sk_buff *skb, struct net_device *dev)
1062 {
1063 struct gt96100_private *gp = netdev_priv(dev);
1064 unsigned long flags;
1065 int nextIn;
1066
1067 spin_lock_irqsave(&gp->lock, flags);
1068
1069 nextIn = gp->tx_next_in;
1070
1071 dbg(3, "%s: nextIn=%d\n", __FUNCTION__, nextIn);
1072
1073 if (gp->tx_count >= TX_RING_SIZE) {
1074 warn("Tx Ring full, pkt dropped.\n");
1075 gp->stats.tx_dropped++;
1076 spin_unlock_irqrestore(&gp->lock, flags);
1077 return 1;
1078 }
1079
1080 if (!(gp->last_psr & psrLink)) {
1081 err("%s: Link down, pkt dropped.\n", __FUNCTION__);
1082 gp->stats.tx_dropped++;
1083 spin_unlock_irqrestore(&gp->lock, flags);
1084 return 1;
1085 }
1086
1087 if (dma32_to_cpu(gp->tx_ring[nextIn].cmdstat) & txOwn) {
1088 err("%s: device owns descriptor, pkt dropped.\n", __FUNCTION__);
1089 gp->stats.tx_dropped++;
1090 // stop the queue, so Tx timeout can fix it
1091 netif_stop_queue(dev);
1092 spin_unlock_irqrestore(&gp->lock, flags);
1093 return 1;
1094 }
1095
1096 // Prepare the Descriptor at tx_next_in
1097 gp->tx_skbuff[nextIn] = skb;
1098 gp->tx_ring[nextIn].byte_cnt = cpu_to_dma16(skb->len);
1099 gp->tx_ring[nextIn].buff_ptr = cpu_to_dma32(virt_to_phys(skb->data));
1100 // make sure packet gets written back to memory
1101 dma_cache_wback_inv((unsigned long)(skb->data), skb->len);
1102 // Give ownership to device, set first and last desc, enable interrupt
1103 // Setting of ownership bit must be *last*!
1104 gp->tx_ring[nextIn].cmdstat =
1105 cpu_to_dma32((u32)(txOwn | txGenCRC | txEI |
1106 txPad | txFirst | txLast));
1107
1108 dump_tx_desc(4, dev, nextIn);
1109 dump_skb(4, dev, skb);
1110
1111 // increment tx_next_in with wrap
1112 gp->tx_next_in = (nextIn + 1) % TX_RING_SIZE;
1113 // If DMA is stopped, restart
1114 if (!(GT96100ETH_READ(gp, GT96100_ETH_PORT_STATUS) & psrTxLow))
1115 GT96100ETH_WRITE(gp, GT96100_ETH_SDMA_COMM,
1116 sdcmrERD | sdcmrTXDL);
1117
1118 // increment count and stop queue if full
1119 if (++gp->tx_count == TX_RING_SIZE) {
1120 gp->tx_full = 1;
1121 netif_stop_queue(dev);
1122 dbg(2, "Tx Ring now full, queue stopped.\n");
1123 }
1124
1125 dev->trans_start = jiffies;
1126 spin_unlock_irqrestore(&gp->lock, flags);
1127
1128 return 0;
1129 }
1130
1131
1132 static int
1133 gt96100_rx(struct net_device *dev, u32 status)
1134 {
1135 struct gt96100_private *gp = netdev_priv(dev);
1136 struct sk_buff *skb;
1137 int pkt_len, nextOut, cdp;
1138 gt96100_rd_t *rd;
1139 u32 cmdstat;
1140
1141 dbg(3, "%s: dev=%p, status=%x\n", __FUNCTION__, dev, status);
1142
1143 cdp = (GT96100ETH_READ(gp, GT96100_ETH_1ST_RX_DESC_PTR0)
1144 - gp->rx_ring_dma) / sizeof(gt96100_rd_t);
1145
1146 // Continue until we reach 1st descriptor pointer
1147 for (nextOut = gp->rx_next_out; nextOut != cdp;
1148 nextOut = (nextOut + 1) % RX_RING_SIZE) {
1149
1150 if (--gp->intr_work_done == 0)
1151 break;
1152
1153 rd = &gp->rx_ring[nextOut];
1154 cmdstat = dma32_to_cpu(rd->cmdstat);
1155
1156 dbg(4, "%s: Rx desc cmdstat=%x, nextOut=%d\n", __FUNCTION__,
1157 cmdstat, nextOut);
1158
1159 if (cmdstat & (u32)rxOwn) {
1160 //err("%s: device owns descriptor!\n", __FUNCTION__);
1161 // DMA is not finished updating descriptor???
1162 // Leave and come back later to pick-up where
1163 // we left off.
1164 break;
1165 }
1166
1167 // Drop this received pkt if there were any errors
1168 if (((cmdstat & (u32)(rxErrorSummary)) &&
1169 (cmdstat & (u32)(rxFirst))) || (status & icrRxError)) {
1170 // update the detailed rx error counters that
1171 // are not covered by the MIB counters.
1172 if (cmdstat & (u32)rxOverrun)
1173 gp->stats.rx_fifo_errors++;
1174 cmdstat |= (u32)rxOwn;
1175 rd->cmdstat = cpu_to_dma32(cmdstat);
1176 continue;
1177 }
1178
1179 /*
1180 * Must be first and last (ie only) descriptor of packet. We
1181 * ignore (drop) any packets that do not fit in one descriptor.
1182 * Every descriptor's receive buffer is large enough to hold
1183 * the maximum 802.3 frame size, so a multi-descriptor packet
1184 * indicates an error. Most if not all corrupted packets will
1185 * have already been dropped by the above check for the
1186 * rxErrorSummary status bit.
1187 */
1188 if (!(cmdstat & (u32)rxFirst) || !(cmdstat & (u32)rxLast)) {
1189 if (cmdstat & (u32)rxFirst) {
1190 /*
1191 * This is the first descriptor of a
1192 * multi-descriptor packet. It isn't corrupted
1193 * because the above check for rxErrorSummary
1194 * would have dropped it already, so what's
1195 * the deal with this packet? Good question,
1196 * let's dump it out.
1197 */
1198 err("%s: desc not first and last!\n", __FUNCTION__);
1199 dump_rx_desc(0, dev, nextOut);
1200 }
1201 cmdstat |= (u32)rxOwn;
1202 rd->cmdstat = cpu_to_dma32(cmdstat);
1203 // continue to drop every descriptor of this packet
1204 continue;
1205 }
1206
1207 pkt_len = dma16_to_cpu(rd->byte_cnt);
1208
1209 /* Create new skb. */
1210 skb = dev_alloc_skb(pkt_len+2);
1211 if (skb == NULL) {
1212 err("%s: Memory squeeze, dropping packet.\n", __FUNCTION__);
1213 gp->stats.rx_dropped++;
1214 cmdstat |= (u32)rxOwn;
1215 rd->cmdstat = cpu_to_dma32(cmdstat);
1216 continue;
1217 }
1218 skb->dev = dev;
1219 skb_reserve(skb, 2); /* 16 byte IP header align */
1220 memcpy(skb_put(skb, pkt_len),
1221 &gp->rx_buff[nextOut*PKT_BUF_SZ], pkt_len);
1222 skb->protocol = eth_type_trans(skb, dev);
1223 dump_skb(4, dev, skb);
1224
1225 netif_rx(skb); /* pass the packet to upper layers */
1226 dev->last_rx = jiffies;
1227
1228 // now we can release ownership of this desc back to device
1229 cmdstat |= (u32)rxOwn;
1230 rd->cmdstat = cpu_to_dma32(cmdstat);
1231 }
1232
1233 if (nextOut == gp->rx_next_out)
1234 dbg(3, "%s: RxCDP did not increment?\n", __FUNCTION__);
1235
1236 gp->rx_next_out = nextOut;
1237 return 0;
1238 }
1239
1240
1241 static void
1242 gt96100_tx_complete(struct net_device *dev, u32 status)
1243 {
1244 struct gt96100_private *gp = netdev_priv(dev);
1245 int nextOut, cdp;
1246 gt96100_td_t *td;
1247 u32 cmdstat;
1248
1249 cdp = (GT96100ETH_READ(gp, GT96100_ETH_CURR_TX_DESC_PTR0)
1250 - gp->tx_ring_dma) / sizeof(gt96100_td_t);
1251
1252 // Continue until we reach the current descriptor pointer
1253 for (nextOut = gp->tx_next_out; nextOut != cdp;
1254 nextOut = (nextOut + 1) % TX_RING_SIZE) {
1255
1256 if (--gp->intr_work_done == 0)
1257 break;
1258
1259 td = &gp->tx_ring[nextOut];
1260 cmdstat = dma32_to_cpu(td->cmdstat);
1261
1262 dbg(3, "%s: Tx desc cmdstat=%x, nextOut=%d\n", __FUNCTION__,
1263 cmdstat, nextOut);
1264
1265 if (cmdstat & (u32)txOwn) {
1266 /*
1267 * DMA is not finished writing descriptor???
1268 * Leave and come back later to pick-up where
1269 * we left off.
1270 */
1271 break;
1272 }
1273
1274 // increment Tx error stats
1275 if (cmdstat & (u32)txErrorSummary) {
1276 dbg(2, "%s: Tx error, cmdstat = %x\n", __FUNCTION__,
1277 cmdstat);
1278 gp->stats.tx_errors++;
1279 if (cmdstat & (u32)txReTxLimit)
1280 gp->stats.tx_aborted_errors++;
1281 if (cmdstat & (u32)txUnderrun)
1282 gp->stats.tx_fifo_errors++;
1283 if (cmdstat & (u32)txLateCollision)
1284 gp->stats.tx_window_errors++;
1285 }
1286
1287 if (cmdstat & (u32)txCollision)
1288 gp->stats.collisions +=
1289 (u32)((cmdstat & txReTxCntMask) >>
1290 txReTxCntBit);
1291
1292 // Wake the queue if the ring was full
1293 if (gp->tx_full) {
1294 gp->tx_full = 0;
1295 if (gp->last_psr & psrLink) {
1296 netif_wake_queue(dev);
1297 dbg(2, "%s: Tx Ring was full, queue waked\n",
1298 __FUNCTION__);
1299 }
1300 }
1301
1302 // decrement tx ring buffer count
1303 if (gp->tx_count) gp->tx_count--;
1304
1305 // free the skb
1306 if (gp->tx_skbuff[nextOut]) {
1307 dbg(3, "%s: good Tx, skb=%p\n", __FUNCTION__,
1308 gp->tx_skbuff[nextOut]);
1309 dev_kfree_skb_irq(gp->tx_skbuff[nextOut]);
1310 gp->tx_skbuff[nextOut] = NULL;
1311 } else {
1312 err("%s: no skb!\n", __FUNCTION__);
1313 }
1314 }
1315
1316 gp->tx_next_out = nextOut;
1317
1318 if (gt96100_check_tx_consistent(gp)) {
1319 err("%s: Tx queue inconsistent!\n", __FUNCTION__);
1320 }
1321
1322 if ((status & icrTxEndLow) && gp->tx_count != 0) {
1323 // we must restart the DMA
1324 dbg(3, "%s: Restarting Tx DMA\n", __FUNCTION__);
1325 GT96100ETH_WRITE(gp, GT96100_ETH_SDMA_COMM,
1326 sdcmrERD | sdcmrTXDL);
1327 }
1328 }
1329
1330
1331 static irqreturn_t
1332 gt96100_interrupt(int irq, void *dev_id, struct pt_regs *regs)
1333 {
1334 struct net_device *dev = (struct net_device *)dev_id;
1335 struct gt96100_private *gp = netdev_priv(dev);
1336 u32 status;
1337 int handled = 0;
1338
1339 if (dev == NULL) {
1340 err("%s: null dev ptr\n", __FUNCTION__);
1341 return IRQ_NONE;
1342 }
1343
1344 dbg(3, "%s: entry, icr=%x\n", __FUNCTION__,
1345 GT96100ETH_READ(gp, GT96100_ETH_INT_CAUSE));
1346
1347 spin_lock(&gp->lock);
1348
1349 gp->intr_work_done = max_interrupt_work;
1350
1351 while (gp->intr_work_done > 0) {
1352
1353 status = GT96100ETH_READ(gp, GT96100_ETH_INT_CAUSE);
1354 // ACK interrupts
1355 GT96100ETH_WRITE(gp, GT96100_ETH_INT_CAUSE, ~status);
1356
1357 if ((status & icrEtherIntSum) == 0 &&
1358 !(status & (icrTxBufferLow|icrTxBufferHigh|icrRxBuffer)))
1359 break;
1360
1361 handled = 1;
1362
1363 if (status & icrMIIPhySTC) {
1364 u32 psr = GT96100ETH_READ(gp, GT96100_ETH_PORT_STATUS);
1365 if (gp->last_psr != psr) {
1366 dbg(0, "port status:\n");
1367 dbg(0, " %s MBit/s, %s-duplex, "
1368 "flow-control %s, link is %s,\n",
1369 psr & psrSpeed ? "100":"10",
1370 psr & psrDuplex ? "full":"half",
1371 psr & psrFctl ? "disabled":"enabled",
1372 psr & psrLink ? "up":"down");
1373 dbg(0, " TxLowQ is %s, TxHighQ is %s, "
1374 "Transmitter is %s\n",
1375 psr & psrTxLow ? "running":"stopped",
1376 psr & psrTxHigh ? "running":"stopped",
1377 psr & psrTxInProg ? "on":"off");
1378
1379 if ((psr & psrLink) && !gp->tx_full &&
1380 netif_queue_stopped(dev)) {
1381 dbg(0, "%s: Link up, waking queue.\n",
1382 __FUNCTION__);
1383 netif_wake_queue(dev);
1384 } else if (!(psr & psrLink) &&
1385 !netif_queue_stopped(dev)) {
1386 dbg(0, "%s: Link down, stopping queue.\n",
1387 __FUNCTION__);
1388 netif_stop_queue(dev);
1389 }
1390
1391 gp->last_psr = psr;
1392 }
1393
1394 if (--gp->intr_work_done == 0)
1395 break;
1396 }
1397
1398 if (status & (icrTxBufferLow | icrTxEndLow))
1399 gt96100_tx_complete(dev, status);
1400
1401 if (status & (icrRxBuffer | icrRxError)) {
1402 gt96100_rx(dev, status);
1403 }
1404
1405 // Now check TX errors (RX errors were handled in gt96100_rx)
1406 if (status & icrTxErrorLow) {
1407 err("%s: Tx resource error\n", __FUNCTION__);
1408 if (--gp->intr_work_done == 0)
1409 break;
1410 }
1411
1412 if (status & icrTxUdr) {
1413 err("%s: Tx underrun error\n", __FUNCTION__);
1414 if (--gp->intr_work_done == 0)
1415 break;
1416 }
1417 }
1418
1419 if (gp->intr_work_done == 0) {
1420 // ACK any remaining pending interrupts
1421 GT96100ETH_WRITE(gp, GT96100_ETH_INT_CAUSE, 0);
1422 dbg(3, "%s: hit max work\n", __FUNCTION__);
1423 }
1424
1425 dbg(3, "%s: exit, icr=%x\n", __FUNCTION__,
1426 GT96100ETH_READ(gp, GT96100_ETH_INT_CAUSE));
1427
1428 spin_unlock(&gp->lock);
1429 return IRQ_RETVAL(handled);
1430 }
1431
1432
1433 static void
1434 gt96100_tx_timeout(struct net_device *dev)
1435 {
1436 struct gt96100_private *gp = netdev_priv(dev);
1437 unsigned long flags;
1438
1439 spin_lock_irqsave(&gp->lock, flags);
1440
1441 if (!(gp->last_psr & psrLink)) {
1442 err("tx_timeout: link down.\n");
1443 spin_unlock_irqrestore(&gp->lock, flags);
1444 } else {
1445 if (gt96100_check_tx_consistent(gp))
1446 err("tx_timeout: Tx ring error.\n");
1447
1448 disable_ether_irq(dev);
1449 spin_unlock_irqrestore(&gp->lock, flags);
1450 reset_tx(dev);
1451 enable_ether_irq(dev);
1452
1453 netif_wake_queue(dev);
1454 }
1455 }
1456
1457
1458 static void
1459 gt96100_set_rx_mode(struct net_device *dev)
1460 {
1461 struct gt96100_private *gp = netdev_priv(dev);
1462 unsigned long flags;
1463 //struct dev_mc_list *mcptr;
1464
1465 dbg(3, "%s: dev=%p, flags=%x\n", __FUNCTION__, dev, dev->flags);
1466
1467 // stop the Receiver DMA
1468 abort(dev, sdcmrAR);
1469
1470 spin_lock_irqsave(&gp->lock, flags);
1471
1472 if (dev->flags & IFF_PROMISC) {
1473 GT96100ETH_WRITE(gp, GT96100_ETH_PORT_CONFIG,
1474 pcrEN | pcrHS | pcrPM);
1475 }
1476
1477 #if 0
1478 /*
1479 FIXME: currently multicast doesn't work - need to get hash table
1480 working first.
1481 */
1482 if (dev->mc_count) {
1483 // clear hash table
1484 memset(gp->hash_table, 0, RX_HASH_TABLE_SIZE);
1485 // Add our ethernet address
1486 gt96100_add_hash_entry(dev, dev->dev_addr);
1487
1488 for (mcptr = dev->mc_list; mcptr; mcptr = mcptr->next) {
1489 dump_hw_addr(2, dev, "%s: addr=", __FUNCTION__,
1490 mcptr->dmi_addr);
1491 gt96100_add_hash_entry(dev, mcptr->dmi_addr);
1492 }
1493 }
1494 #endif
1495
1496 // restart Rx DMA
1497 GT96100ETH_WRITE(gp, GT96100_ETH_SDMA_COMM, sdcmrERD);
1498
1499 spin_unlock_irqrestore(&gp->lock, flags);
1500 }
1501
1502 static struct net_device_stats *
1503 gt96100_get_stats(struct net_device *dev)
1504 {
1505 struct gt96100_private *gp = netdev_priv(dev);
1506 unsigned long flags;
1507
1508 dbg(3, "%s: dev=%p\n", __FUNCTION__, dev);
1509
1510 if (netif_device_present(dev)) {
1511 spin_lock_irqsave (&gp->lock, flags);
1512 update_stats(gp);
1513 spin_unlock_irqrestore (&gp->lock, flags);
1514 }
1515
1516 return &gp->stats;
1517 }
1518
1519 static void gt96100_cleanup_module(void)
1520 {
1521 int i;
1522 for (i=0; i<NUM_INTERFACES; i++) {
1523 struct gt96100_if_t *gtif = &gt96100_iflist[i];
1524 if (gtif->dev != NULL) {
1525 struct gt96100_private *gp = (struct gt96100_private *)
1526 netdev_priv(gtif->dev);
1527 unregister_netdev(gtif->dev);
1528 dmafree(RX_HASH_TABLE_SIZE, gp->hash_table_dma);
1529 dmafree(PKT_BUF_SZ*RX_RING_SIZE, gp->rx_buff);
1530 dmafree(sizeof(gt96100_rd_t) * RX_RING_SIZE
1531 + sizeof(gt96100_td_t) * TX_RING_SIZE,
1532 gp->rx_ring);
1533 free_netdev(gtif->dev);
1534 release_region(gtif->iobase, gp->io_size);
1535 }
1536 }
1537 }
1538
1539 static int __init gt96100_setup(char *options)
1540 {
1541 char *this_opt;
1542
1543 if (!options || !*options)
1544 return 0;
1545
1546 while ((this_opt = strsep (&options, ",")) != NULL) {
1547 if (!*this_opt)
1548 continue;
1549 if (!strncmp(this_opt, "mac0:", 5)) {
1550 memcpy(mac0, this_opt+5, 17);
1551 mac0[17]= '\0';
1552 } else if (!strncmp(this_opt, "mac1:", 5)) {
1553 memcpy(mac1, this_opt+5, 17);
1554 mac1[17]= '\0';
1555 }
1556 }
1557
1558 return 1;
1559 }
1560
1561 __setup("gt96100eth=", gt96100_setup);
1562
1563 module_init(gt96100_init_module);
1564 module_exit(gt96100_cleanup_module);
1565
1566 MODULE_AUTHOR("Steve Longerbeam <stevel@mvista.com>");
1567 MODULE_DESCRIPTION("GT96100 Ethernet driver");
Linux with added FPC-III support