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1/*
2 * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
3 *
4 * 2005-2010 (c) Aeroflex Gaisler AB
5 *
6 * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
7 * available in the GRLIB VHDL IP core library.
8 *
9 * Full documentation of both cores can be found here:
10 * http://www.gaisler.com/products/grlib/grip.pdf
11 *
12 * The Gigabit version supports scatter/gather DMA, any alignment of
13 * buffers and checksum offloading.
14 *
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License as published by the
17 * Free Software Foundation; either version 2 of the License, or (at your
18 * option) any later version.
19 *
20 * Contributors: Kristoffer Glembo
21 * Daniel Hellstrom
22 * Marko Isomaki
23 */
24
25#include <linux/dma-mapping.h>
26#include <linux/module.h>
27#include <linux/uaccess.h>
28#include <linux/interrupt.h>
29#include <linux/netdevice.h>
30#include <linux/etherdevice.h>
31#include <linux/ethtool.h>
32#include <linux/skbuff.h>
33#include <linux/io.h>
34#include <linux/crc32.h>
35#include <linux/mii.h>
36#include <linux/of_device.h>
37#include <linux/of_platform.h>
38#include <linux/slab.h>
39#include <asm/cacheflush.h>
40#include <asm/byteorder.h>
41
42#ifdef CONFIG_SPARC
43#include <asm/idprom.h>
44#endif
45
46#include "greth.h"
47
48#define GRETH_DEF_MSG_ENABLE \
49 (NETIF_MSG_DRV | \
50 NETIF_MSG_PROBE | \
51 NETIF_MSG_LINK | \
52 NETIF_MSG_IFDOWN | \
53 NETIF_MSG_IFUP | \
54 NETIF_MSG_RX_ERR | \
55 NETIF_MSG_TX_ERR)
56
57static int greth_debug = -1; /* -1 == use GRETH_DEF_MSG_ENABLE as value */
58module_param(greth_debug, int, 0);
59MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
60
61/* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
62static int macaddr[6];
63module_param_array(macaddr, int, NULL, 0);
64MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
65
66static int greth_edcl = 1;
67module_param(greth_edcl, int, 0);
68MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
69
70static int greth_open(struct net_device *dev);
71static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
72 struct net_device *dev);
73static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
74 struct net_device *dev);
75static int greth_rx(struct net_device *dev, int limit);
76static int greth_rx_gbit(struct net_device *dev, int limit);
77static void greth_clean_tx(struct net_device *dev);
78static void greth_clean_tx_gbit(struct net_device *dev);
79static irqreturn_t greth_interrupt(int irq, void *dev_id);
80static int greth_close(struct net_device *dev);
81static int greth_set_mac_add(struct net_device *dev, void *p);
82static void greth_set_multicast_list(struct net_device *dev);
83
84#define GRETH_REGLOAD(a) (be32_to_cpu(__raw_readl(&(a))))
85#define GRETH_REGSAVE(a, v) (__raw_writel(cpu_to_be32(v), &(a)))
86#define GRETH_REGORIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
87#define GRETH_REGANDIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
88
89#define NEXT_TX(N) (((N) + 1) & GRETH_TXBD_NUM_MASK)
90#define SKIP_TX(N, C) (((N) + C) & GRETH_TXBD_NUM_MASK)
91#define NEXT_RX(N) (((N) + 1) & GRETH_RXBD_NUM_MASK)
92
93static void greth_print_rx_packet(void *addr, int len)
94{
95 print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
96 addr, len, true);
97}
98
99static void greth_print_tx_packet(struct sk_buff *skb)
100{
101 int i;
102 int length;
103
104 if (skb_shinfo(skb)->nr_frags == 0)
105 length = skb->len;
106 else
107 length = skb_headlen(skb);
108
109 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
110 skb->data, length, true);
111
112 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
113
114 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
115 skb_frag_address(&skb_shinfo(skb)->frags[i]),
116 skb_shinfo(skb)->frags[i].size, true);
117 }
118}
119
120static inline void greth_enable_tx(struct greth_private *greth)
121{
122 wmb();
123 GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
124}
125
126static inline void greth_enable_tx_and_irq(struct greth_private *greth)
127{
128 wmb(); /* BDs must been written to memory before enabling TX */
129 GRETH_REGORIN(greth->regs->control, GRETH_TXEN | GRETH_TXI);
130}
131
132static inline void greth_disable_tx(struct greth_private *greth)
133{
134 GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
135}
136
137static inline void greth_enable_rx(struct greth_private *greth)
138{
139 wmb();
140 GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
141}
142
143static inline void greth_disable_rx(struct greth_private *greth)
144{
145 GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
146}
147
148static inline void greth_enable_irqs(struct greth_private *greth)
149{
150 GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
151}
152
153static inline void greth_disable_irqs(struct greth_private *greth)
154{
155 GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
156}
157
158static inline void greth_write_bd(u32 *bd, u32 val)
159{
160 __raw_writel(cpu_to_be32(val), bd);
161}
162
163static inline u32 greth_read_bd(u32 *bd)
164{
165 return be32_to_cpu(__raw_readl(bd));
166}
167
168static void greth_clean_rings(struct greth_private *greth)
169{
170 int i;
171 struct greth_bd *rx_bdp = greth->rx_bd_base;
172 struct greth_bd *tx_bdp = greth->tx_bd_base;
173
174 if (greth->gbit_mac) {
175
176 /* Free and unmap RX buffers */
177 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
178 if (greth->rx_skbuff[i] != NULL) {
179 dev_kfree_skb(greth->rx_skbuff[i]);
180 dma_unmap_single(greth->dev,
181 greth_read_bd(&rx_bdp->addr),
182 MAX_FRAME_SIZE+NET_IP_ALIGN,
183 DMA_FROM_DEVICE);
184 }
185 }
186
187 /* TX buffers */
188 while (greth->tx_free < GRETH_TXBD_NUM) {
189
190 struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
191 int nr_frags = skb_shinfo(skb)->nr_frags;
192 tx_bdp = greth->tx_bd_base + greth->tx_last;
193 greth->tx_last = NEXT_TX(greth->tx_last);
194
195 dma_unmap_single(greth->dev,
196 greth_read_bd(&tx_bdp->addr),
197 skb_headlen(skb),
198 DMA_TO_DEVICE);
199
200 for (i = 0; i < nr_frags; i++) {
201 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
202 tx_bdp = greth->tx_bd_base + greth->tx_last;
203
204 dma_unmap_page(greth->dev,
205 greth_read_bd(&tx_bdp->addr),
206 skb_frag_size(frag),
207 DMA_TO_DEVICE);
208
209 greth->tx_last = NEXT_TX(greth->tx_last);
210 }
211 greth->tx_free += nr_frags+1;
212 dev_kfree_skb(skb);
213 }
214
215
216 } else { /* 10/100 Mbps MAC */
217
218 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
219 kfree(greth->rx_bufs[i]);
220 dma_unmap_single(greth->dev,
221 greth_read_bd(&rx_bdp->addr),
222 MAX_FRAME_SIZE,
223 DMA_FROM_DEVICE);
224 }
225 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
226 kfree(greth->tx_bufs[i]);
227 dma_unmap_single(greth->dev,
228 greth_read_bd(&tx_bdp->addr),
229 MAX_FRAME_SIZE,
230 DMA_TO_DEVICE);
231 }
232 }
233}
234
235static int greth_init_rings(struct greth_private *greth)
236{
237 struct sk_buff *skb;
238 struct greth_bd *rx_bd, *tx_bd;
239 u32 dma_addr;
240 int i;
241
242 rx_bd = greth->rx_bd_base;
243 tx_bd = greth->tx_bd_base;
244
245 /* Initialize descriptor rings and buffers */
246 if (greth->gbit_mac) {
247
248 for (i = 0; i < GRETH_RXBD_NUM; i++) {
249 skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
250 if (skb == NULL) {
251 if (netif_msg_ifup(greth))
252 dev_err(greth->dev, "Error allocating DMA ring.\n");
253 goto cleanup;
254 }
255 skb_reserve(skb, NET_IP_ALIGN);
256 dma_addr = dma_map_single(greth->dev,
257 skb->data,
258 MAX_FRAME_SIZE+NET_IP_ALIGN,
259 DMA_FROM_DEVICE);
260
261 if (dma_mapping_error(greth->dev, dma_addr)) {
262 if (netif_msg_ifup(greth))
263 dev_err(greth->dev, "Could not create initial DMA mapping\n");
264 goto cleanup;
265 }
266 greth->rx_skbuff[i] = skb;
267 greth_write_bd(&rx_bd[i].addr, dma_addr);
268 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
269 }
270
271 } else {
272
273 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
274 for (i = 0; i < GRETH_RXBD_NUM; i++) {
275
276 greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
277
278 if (greth->rx_bufs[i] == NULL) {
279 if (netif_msg_ifup(greth))
280 dev_err(greth->dev, "Error allocating DMA ring.\n");
281 goto cleanup;
282 }
283
284 dma_addr = dma_map_single(greth->dev,
285 greth->rx_bufs[i],
286 MAX_FRAME_SIZE,
287 DMA_FROM_DEVICE);
288
289 if (dma_mapping_error(greth->dev, dma_addr)) {
290 if (netif_msg_ifup(greth))
291 dev_err(greth->dev, "Could not create initial DMA mapping\n");
292 goto cleanup;
293 }
294 greth_write_bd(&rx_bd[i].addr, dma_addr);
295 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
296 }
297 for (i = 0; i < GRETH_TXBD_NUM; i++) {
298
299 greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
300
301 if (greth->tx_bufs[i] == NULL) {
302 if (netif_msg_ifup(greth))
303 dev_err(greth->dev, "Error allocating DMA ring.\n");
304 goto cleanup;
305 }
306
307 dma_addr = dma_map_single(greth->dev,
308 greth->tx_bufs[i],
309 MAX_FRAME_SIZE,
310 DMA_TO_DEVICE);
311
312 if (dma_mapping_error(greth->dev, dma_addr)) {
313 if (netif_msg_ifup(greth))
314 dev_err(greth->dev, "Could not create initial DMA mapping\n");
315 goto cleanup;
316 }
317 greth_write_bd(&tx_bd[i].addr, dma_addr);
318 greth_write_bd(&tx_bd[i].stat, 0);
319 }
320 }
321 greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
322 greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
323
324 /* Initialize pointers. */
325 greth->rx_cur = 0;
326 greth->tx_next = 0;
327 greth->tx_last = 0;
328 greth->tx_free = GRETH_TXBD_NUM;
329
330 /* Initialize descriptor base address */
331 GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
332 GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
333
334 return 0;
335
336cleanup:
337 greth_clean_rings(greth);
338 return -ENOMEM;
339}
340
341static int greth_open(struct net_device *dev)
342{
343 struct greth_private *greth = netdev_priv(dev);
344 int err;
345
346 err = greth_init_rings(greth);
347 if (err) {
348 if (netif_msg_ifup(greth))
349 dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
350 return err;
351 }
352
353 err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
354 if (err) {
355 if (netif_msg_ifup(greth))
356 dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
357 greth_clean_rings(greth);
358 return err;
359 }
360
361 if (netif_msg_ifup(greth))
362 dev_dbg(&dev->dev, " starting queue\n");
363 netif_start_queue(dev);
364
365 GRETH_REGSAVE(greth->regs->status, 0xFF);
366
367 napi_enable(&greth->napi);
368
369 greth_enable_irqs(greth);
370 greth_enable_tx(greth);
371 greth_enable_rx(greth);
372 return 0;
373
374}
375
376static int greth_close(struct net_device *dev)
377{
378 struct greth_private *greth = netdev_priv(dev);
379
380 napi_disable(&greth->napi);
381
382 greth_disable_irqs(greth);
383 greth_disable_tx(greth);
384 greth_disable_rx(greth);
385
386 netif_stop_queue(dev);
387
388 free_irq(greth->irq, (void *) dev);
389
390 greth_clean_rings(greth);
391
392 return 0;
393}
394
395static netdev_tx_t
396greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
397{
398 struct greth_private *greth = netdev_priv(dev);
399 struct greth_bd *bdp;
400 int err = NETDEV_TX_OK;
401 u32 status, dma_addr, ctrl;
402 unsigned long flags;
403
404 /* Clean TX Ring */
405 greth_clean_tx(greth->netdev);
406
407 if (unlikely(greth->tx_free <= 0)) {
408 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
409 ctrl = GRETH_REGLOAD(greth->regs->control);
410 /* Enable TX IRQ only if not already in poll() routine */
411 if (ctrl & GRETH_RXI)
412 GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
413 netif_stop_queue(dev);
414 spin_unlock_irqrestore(&greth->devlock, flags);
415 return NETDEV_TX_BUSY;
416 }
417
418 if (netif_msg_pktdata(greth))
419 greth_print_tx_packet(skb);
420
421
422 if (unlikely(skb->len > MAX_FRAME_SIZE)) {
423 dev->stats.tx_errors++;
424 goto out;
425 }
426
427 bdp = greth->tx_bd_base + greth->tx_next;
428 dma_addr = greth_read_bd(&bdp->addr);
429
430 memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
431
432 dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
433
434 status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
435 greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;
436
437 /* Wrap around descriptor ring */
438 if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
439 status |= GRETH_BD_WR;
440 }
441
442 greth->tx_next = NEXT_TX(greth->tx_next);
443 greth->tx_free--;
444
445 /* Write descriptor control word and enable transmission */
446 greth_write_bd(&bdp->stat, status);
447 spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
448 greth_enable_tx(greth);
449 spin_unlock_irqrestore(&greth->devlock, flags);
450
451out:
452 dev_kfree_skb(skb);
453 return err;
454}
455
456static inline u16 greth_num_free_bds(u16 tx_last, u16 tx_next)
457{
458 if (tx_next < tx_last)
459 return (tx_last - tx_next) - 1;
460 else
461 return GRETH_TXBD_NUM - (tx_next - tx_last) - 1;
462}
463
464static netdev_tx_t
465greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
466{
467 struct greth_private *greth = netdev_priv(dev);
468 struct greth_bd *bdp;
469 u32 status, dma_addr;
470 int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
471 unsigned long flags;
472 u16 tx_last;
473
474 nr_frags = skb_shinfo(skb)->nr_frags;
475 tx_last = greth->tx_last;
476 rmb(); /* tx_last is updated by the poll task */
477
478 if (greth_num_free_bds(tx_last, greth->tx_next) < nr_frags + 1) {
479 netif_stop_queue(dev);
480 err = NETDEV_TX_BUSY;
481 goto out;
482 }
483
484 if (netif_msg_pktdata(greth))
485 greth_print_tx_packet(skb);
486
487 if (unlikely(skb->len > MAX_FRAME_SIZE)) {
488 dev->stats.tx_errors++;
489 goto out;
490 }
491
492 /* Save skb pointer. */
493 greth->tx_skbuff[greth->tx_next] = skb;
494
495 /* Linear buf */
496 if (nr_frags != 0)
497 status = GRETH_TXBD_MORE;
498 else
499 status = GRETH_BD_IE;
500
501 if (skb->ip_summed == CHECKSUM_PARTIAL)
502 status |= GRETH_TXBD_CSALL;
503 status |= skb_headlen(skb) & GRETH_BD_LEN;
504 if (greth->tx_next == GRETH_TXBD_NUM_MASK)
505 status |= GRETH_BD_WR;
506
507
508 bdp = greth->tx_bd_base + greth->tx_next;
509 greth_write_bd(&bdp->stat, status);
510 dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
511
512 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
513 goto map_error;
514
515 greth_write_bd(&bdp->addr, dma_addr);
516
517 curr_tx = NEXT_TX(greth->tx_next);
518
519 /* Frags */
520 for (i = 0; i < nr_frags; i++) {
521 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
522 greth->tx_skbuff[curr_tx] = NULL;
523 bdp = greth->tx_bd_base + curr_tx;
524
525 status = GRETH_BD_EN;
526 if (skb->ip_summed == CHECKSUM_PARTIAL)
527 status |= GRETH_TXBD_CSALL;
528 status |= skb_frag_size(frag) & GRETH_BD_LEN;
529
530 /* Wrap around descriptor ring */
531 if (curr_tx == GRETH_TXBD_NUM_MASK)
532 status |= GRETH_BD_WR;
533
534 /* More fragments left */
535 if (i < nr_frags - 1)
536 status |= GRETH_TXBD_MORE;
537 else
538 status |= GRETH_BD_IE; /* enable IRQ on last fragment */
539
540 greth_write_bd(&bdp->stat, status);
541
542 dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag),
543 DMA_TO_DEVICE);
544
545 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
546 goto frag_map_error;
547
548 greth_write_bd(&bdp->addr, dma_addr);
549
550 curr_tx = NEXT_TX(curr_tx);
551 }
552
553 wmb();
554
555 /* Enable the descriptor chain by enabling the first descriptor */
556 bdp = greth->tx_bd_base + greth->tx_next;
557 greth_write_bd(&bdp->stat,
558 greth_read_bd(&bdp->stat) | GRETH_BD_EN);
559
560 spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
561 greth->tx_next = curr_tx;
562 greth_enable_tx_and_irq(greth);
563 spin_unlock_irqrestore(&greth->devlock, flags);
564
565 return NETDEV_TX_OK;
566
567frag_map_error:
568 /* Unmap SKB mappings that succeeded and disable descriptor */
569 for (i = 0; greth->tx_next + i != curr_tx; i++) {
570 bdp = greth->tx_bd_base + greth->tx_next + i;
571 dma_unmap_single(greth->dev,
572 greth_read_bd(&bdp->addr),
573 greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
574 DMA_TO_DEVICE);
575 greth_write_bd(&bdp->stat, 0);
576 }
577map_error:
578 if (net_ratelimit())
579 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
580 dev_kfree_skb(skb);
581out:
582 return err;
583}
584
585static irqreturn_t greth_interrupt(int irq, void *dev_id)
586{
587 struct net_device *dev = dev_id;
588 struct greth_private *greth;
589 u32 status, ctrl;
590 irqreturn_t retval = IRQ_NONE;
591
592 greth = netdev_priv(dev);
593
594 spin_lock(&greth->devlock);
595
596 /* Get the interrupt events that caused us to be here. */
597 status = GRETH_REGLOAD(greth->regs->status);
598
599 /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
600 * set regardless of whether IRQ is enabled or not. Especially
601 * important when shared IRQ.
602 */
603 ctrl = GRETH_REGLOAD(greth->regs->control);
604
605 /* Handle rx and tx interrupts through poll */
606 if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
607 ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
608 retval = IRQ_HANDLED;
609
610 /* Disable interrupts and schedule poll() */
611 greth_disable_irqs(greth);
612 napi_schedule(&greth->napi);
613 }
614
615 mmiowb();
616 spin_unlock(&greth->devlock);
617
618 return retval;
619}
620
621static void greth_clean_tx(struct net_device *dev)
622{
623 struct greth_private *greth;
624 struct greth_bd *bdp;
625 u32 stat;
626
627 greth = netdev_priv(dev);
628
629 while (1) {
630 bdp = greth->tx_bd_base + greth->tx_last;
631 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
632 mb();
633 stat = greth_read_bd(&bdp->stat);
634
635 if (unlikely(stat & GRETH_BD_EN))
636 break;
637
638 if (greth->tx_free == GRETH_TXBD_NUM)
639 break;
640
641 /* Check status for errors */
642 if (unlikely(stat & GRETH_TXBD_STATUS)) {
643 dev->stats.tx_errors++;
644 if (stat & GRETH_TXBD_ERR_AL)
645 dev->stats.tx_aborted_errors++;
646 if (stat & GRETH_TXBD_ERR_UE)
647 dev->stats.tx_fifo_errors++;
648 }
649 dev->stats.tx_packets++;
650 dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
651 greth->tx_last = NEXT_TX(greth->tx_last);
652 greth->tx_free++;
653 }
654
655 if (greth->tx_free > 0) {
656 netif_wake_queue(dev);
657 }
658}
659
660static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
661{
662 /* Check status for errors */
663 if (unlikely(stat & GRETH_TXBD_STATUS)) {
664 dev->stats.tx_errors++;
665 if (stat & GRETH_TXBD_ERR_AL)
666 dev->stats.tx_aborted_errors++;
667 if (stat & GRETH_TXBD_ERR_UE)
668 dev->stats.tx_fifo_errors++;
669 if (stat & GRETH_TXBD_ERR_LC)
670 dev->stats.tx_aborted_errors++;
671 }
672 dev->stats.tx_packets++;
673}
674
675static void greth_clean_tx_gbit(struct net_device *dev)
676{
677 struct greth_private *greth;
678 struct greth_bd *bdp, *bdp_last_frag;
679 struct sk_buff *skb = NULL;
680 u32 stat;
681 int nr_frags, i;
682 u16 tx_last;
683
684 greth = netdev_priv(dev);
685 tx_last = greth->tx_last;
686
687 while (tx_last != greth->tx_next) {
688
689 skb = greth->tx_skbuff[tx_last];
690
691 nr_frags = skb_shinfo(skb)->nr_frags;
692
693 /* We only clean fully completed SKBs */
694 bdp_last_frag = greth->tx_bd_base + SKIP_TX(tx_last, nr_frags);
695
696 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
697 mb();
698 stat = greth_read_bd(&bdp_last_frag->stat);
699
700 if (stat & GRETH_BD_EN)
701 break;
702
703 greth->tx_skbuff[tx_last] = NULL;
704
705 greth_update_tx_stats(dev, stat);
706 dev->stats.tx_bytes += skb->len;
707
708 bdp = greth->tx_bd_base + tx_last;
709
710 tx_last = NEXT_TX(tx_last);
711
712 dma_unmap_single(greth->dev,
713 greth_read_bd(&bdp->addr),
714 skb_headlen(skb),
715 DMA_TO_DEVICE);
716
717 for (i = 0; i < nr_frags; i++) {
718 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
719 bdp = greth->tx_bd_base + tx_last;
720
721 dma_unmap_page(greth->dev,
722 greth_read_bd(&bdp->addr),
723 skb_frag_size(frag),
724 DMA_TO_DEVICE);
725
726 tx_last = NEXT_TX(tx_last);
727 }
728 dev_kfree_skb(skb);
729 }
730 if (skb) { /* skb is set only if the above while loop was entered */
731 wmb();
732 greth->tx_last = tx_last;
733
734 if (netif_queue_stopped(dev) &&
735 (greth_num_free_bds(tx_last, greth->tx_next) >
736 (MAX_SKB_FRAGS+1)))
737 netif_wake_queue(dev);
738 }
739}
740
741static int greth_rx(struct net_device *dev, int limit)
742{
743 struct greth_private *greth;
744 struct greth_bd *bdp;
745 struct sk_buff *skb;
746 int pkt_len;
747 int bad, count;
748 u32 status, dma_addr;
749 unsigned long flags;
750
751 greth = netdev_priv(dev);
752
753 for (count = 0; count < limit; ++count) {
754
755 bdp = greth->rx_bd_base + greth->rx_cur;
756 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
757 mb();
758 status = greth_read_bd(&bdp->stat);
759
760 if (unlikely(status & GRETH_BD_EN)) {
761 break;
762 }
763
764 dma_addr = greth_read_bd(&bdp->addr);
765 bad = 0;
766
767 /* Check status for errors. */
768 if (unlikely(status & GRETH_RXBD_STATUS)) {
769 if (status & GRETH_RXBD_ERR_FT) {
770 dev->stats.rx_length_errors++;
771 bad = 1;
772 }
773 if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
774 dev->stats.rx_frame_errors++;
775 bad = 1;
776 }
777 if (status & GRETH_RXBD_ERR_CRC) {
778 dev->stats.rx_crc_errors++;
779 bad = 1;
780 }
781 }
782 if (unlikely(bad)) {
783 dev->stats.rx_errors++;
784
785 } else {
786
787 pkt_len = status & GRETH_BD_LEN;
788
789 skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
790
791 if (unlikely(skb == NULL)) {
792
793 if (net_ratelimit())
794 dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
795
796 dev->stats.rx_dropped++;
797
798 } else {
799 skb_reserve(skb, NET_IP_ALIGN);
800
801 dma_sync_single_for_cpu(greth->dev,
802 dma_addr,
803 pkt_len,
804 DMA_FROM_DEVICE);
805
806 if (netif_msg_pktdata(greth))
807 greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
808
809 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
810
811 skb->protocol = eth_type_trans(skb, dev);
812 dev->stats.rx_bytes += pkt_len;
813 dev->stats.rx_packets++;
814 netif_receive_skb(skb);
815 }
816 }
817
818 status = GRETH_BD_EN | GRETH_BD_IE;
819 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
820 status |= GRETH_BD_WR;
821 }
822
823 wmb();
824 greth_write_bd(&bdp->stat, status);
825
826 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
827
828 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
829 greth_enable_rx(greth);
830 spin_unlock_irqrestore(&greth->devlock, flags);
831
832 greth->rx_cur = NEXT_RX(greth->rx_cur);
833 }
834
835 return count;
836}
837
838static inline int hw_checksummed(u32 status)
839{
840
841 if (status & GRETH_RXBD_IP_FRAG)
842 return 0;
843
844 if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
845 return 0;
846
847 if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
848 return 0;
849
850 if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
851 return 0;
852
853 return 1;
854}
855
856static int greth_rx_gbit(struct net_device *dev, int limit)
857{
858 struct greth_private *greth;
859 struct greth_bd *bdp;
860 struct sk_buff *skb, *newskb;
861 int pkt_len;
862 int bad, count = 0;
863 u32 status, dma_addr;
864 unsigned long flags;
865
866 greth = netdev_priv(dev);
867
868 for (count = 0; count < limit; ++count) {
869
870 bdp = greth->rx_bd_base + greth->rx_cur;
871 skb = greth->rx_skbuff[greth->rx_cur];
872 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
873 mb();
874 status = greth_read_bd(&bdp->stat);
875 bad = 0;
876
877 if (status & GRETH_BD_EN)
878 break;
879
880 /* Check status for errors. */
881 if (unlikely(status & GRETH_RXBD_STATUS)) {
882
883 if (status & GRETH_RXBD_ERR_FT) {
884 dev->stats.rx_length_errors++;
885 bad = 1;
886 } else if (status &
887 (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
888 dev->stats.rx_frame_errors++;
889 bad = 1;
890 } else if (status & GRETH_RXBD_ERR_CRC) {
891 dev->stats.rx_crc_errors++;
892 bad = 1;
893 }
894 }
895
896 /* Allocate new skb to replace current, not needed if the
897 * current skb can be reused */
898 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
899 skb_reserve(newskb, NET_IP_ALIGN);
900
901 dma_addr = dma_map_single(greth->dev,
902 newskb->data,
903 MAX_FRAME_SIZE + NET_IP_ALIGN,
904 DMA_FROM_DEVICE);
905
906 if (!dma_mapping_error(greth->dev, dma_addr)) {
907 /* Process the incoming frame. */
908 pkt_len = status & GRETH_BD_LEN;
909
910 dma_unmap_single(greth->dev,
911 greth_read_bd(&bdp->addr),
912 MAX_FRAME_SIZE + NET_IP_ALIGN,
913 DMA_FROM_DEVICE);
914
915 if (netif_msg_pktdata(greth))
916 greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
917
918 skb_put(skb, pkt_len);
919
920 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
921 skb->ip_summed = CHECKSUM_UNNECESSARY;
922 else
923 skb_checksum_none_assert(skb);
924
925 skb->protocol = eth_type_trans(skb, dev);
926 dev->stats.rx_packets++;
927 dev->stats.rx_bytes += pkt_len;
928 netif_receive_skb(skb);
929
930 greth->rx_skbuff[greth->rx_cur] = newskb;
931 greth_write_bd(&bdp->addr, dma_addr);
932 } else {
933 if (net_ratelimit())
934 dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
935 dev_kfree_skb(newskb);
936 /* reusing current skb, so it is a drop */
937 dev->stats.rx_dropped++;
938 }
939 } else if (bad) {
940 /* Bad Frame transfer, the skb is reused */
941 dev->stats.rx_dropped++;
942 } else {
943 /* Failed Allocating a new skb. This is rather stupid
944 * but the current "filled" skb is reused, as if
945 * transfer failure. One could argue that RX descriptor
946 * table handling should be divided into cleaning and
947 * filling as the TX part of the driver
948 */
949 if (net_ratelimit())
950 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
951 /* reusing current skb, so it is a drop */
952 dev->stats.rx_dropped++;
953 }
954
955 status = GRETH_BD_EN | GRETH_BD_IE;
956 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
957 status |= GRETH_BD_WR;
958 }
959
960 wmb();
961 greth_write_bd(&bdp->stat, status);
962 spin_lock_irqsave(&greth->devlock, flags);
963 greth_enable_rx(greth);
964 spin_unlock_irqrestore(&greth->devlock, flags);
965 greth->rx_cur = NEXT_RX(greth->rx_cur);
966 }
967
968 return count;
969
970}
971
972static int greth_poll(struct napi_struct *napi, int budget)
973{
974 struct greth_private *greth;
975 int work_done = 0;
976 unsigned long flags;
977 u32 mask, ctrl;
978 greth = container_of(napi, struct greth_private, napi);
979
980restart_txrx_poll:
981 if (greth->gbit_mac) {
982 greth_clean_tx_gbit(greth->netdev);
983 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
984 } else {
985 if (netif_queue_stopped(greth->netdev))
986 greth_clean_tx(greth->netdev);
987 work_done += greth_rx(greth->netdev, budget - work_done);
988 }
989
990 if (work_done < budget) {
991
992 spin_lock_irqsave(&greth->devlock, flags);
993
994 ctrl = GRETH_REGLOAD(greth->regs->control);
995 if ((greth->gbit_mac && (greth->tx_last != greth->tx_next)) ||
996 (!greth->gbit_mac && netif_queue_stopped(greth->netdev))) {
997 GRETH_REGSAVE(greth->regs->control,
998 ctrl | GRETH_TXI | GRETH_RXI);
999 mask = GRETH_INT_RX | GRETH_INT_RE |
1000 GRETH_INT_TX | GRETH_INT_TE;
1001 } else {
1002 GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
1003 mask = GRETH_INT_RX | GRETH_INT_RE;
1004 }
1005
1006 if (GRETH_REGLOAD(greth->regs->status) & mask) {
1007 GRETH_REGSAVE(greth->regs->control, ctrl);
1008 spin_unlock_irqrestore(&greth->devlock, flags);
1009 goto restart_txrx_poll;
1010 } else {
1011 __napi_complete(napi);
1012 spin_unlock_irqrestore(&greth->devlock, flags);
1013 }
1014 }
1015
1016 return work_done;
1017}
1018
1019static int greth_set_mac_add(struct net_device *dev, void *p)
1020{
1021 struct sockaddr *addr = p;
1022 struct greth_private *greth;
1023 struct greth_regs *regs;
1024
1025 greth = netdev_priv(dev);
1026 regs = greth->regs;
1027
1028 if (!is_valid_ether_addr(addr->sa_data))
1029 return -EADDRNOTAVAIL;
1030
1031 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1032 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1033 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1034 dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1035
1036 return 0;
1037}
1038
1039static u32 greth_hash_get_index(__u8 *addr)
1040{
1041 return (ether_crc(6, addr)) & 0x3F;
1042}
1043
1044static void greth_set_hash_filter(struct net_device *dev)
1045{
1046 struct netdev_hw_addr *ha;
1047 struct greth_private *greth = netdev_priv(dev);
1048 struct greth_regs *regs = greth->regs;
1049 u32 mc_filter[2];
1050 unsigned int bitnr;
1051
1052 mc_filter[0] = mc_filter[1] = 0;
1053
1054 netdev_for_each_mc_addr(ha, dev) {
1055 bitnr = greth_hash_get_index(ha->addr);
1056 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1057 }
1058
1059 GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1060 GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1061}
1062
1063static void greth_set_multicast_list(struct net_device *dev)
1064{
1065 int cfg;
1066 struct greth_private *greth = netdev_priv(dev);
1067 struct greth_regs *regs = greth->regs;
1068
1069 cfg = GRETH_REGLOAD(regs->control);
1070 if (dev->flags & IFF_PROMISC)
1071 cfg |= GRETH_CTRL_PR;
1072 else
1073 cfg &= ~GRETH_CTRL_PR;
1074
1075 if (greth->multicast) {
1076 if (dev->flags & IFF_ALLMULTI) {
1077 GRETH_REGSAVE(regs->hash_msb, -1);
1078 GRETH_REGSAVE(regs->hash_lsb, -1);
1079 cfg |= GRETH_CTRL_MCEN;
1080 GRETH_REGSAVE(regs->control, cfg);
1081 return;
1082 }
1083
1084 if (netdev_mc_empty(dev)) {
1085 cfg &= ~GRETH_CTRL_MCEN;
1086 GRETH_REGSAVE(regs->control, cfg);
1087 return;
1088 }
1089
1090 /* Setup multicast filter */
1091 greth_set_hash_filter(dev);
1092 cfg |= GRETH_CTRL_MCEN;
1093 }
1094 GRETH_REGSAVE(regs->control, cfg);
1095}
1096
1097static u32 greth_get_msglevel(struct net_device *dev)
1098{
1099 struct greth_private *greth = netdev_priv(dev);
1100 return greth->msg_enable;
1101}
1102
1103static void greth_set_msglevel(struct net_device *dev, u32 value)
1104{
1105 struct greth_private *greth = netdev_priv(dev);
1106 greth->msg_enable = value;
1107}
1108static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1109{
1110 struct greth_private *greth = netdev_priv(dev);
1111 struct phy_device *phy = greth->phy;
1112
1113 if (!phy)
1114 return -ENODEV;
1115
1116 return phy_ethtool_gset(phy, cmd);
1117}
1118
1119static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1120{
1121 struct greth_private *greth = netdev_priv(dev);
1122 struct phy_device *phy = greth->phy;
1123
1124 if (!phy)
1125 return -ENODEV;
1126
1127 return phy_ethtool_sset(phy, cmd);
1128}
1129
1130static int greth_get_regs_len(struct net_device *dev)
1131{
1132 return sizeof(struct greth_regs);
1133}
1134
1135static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1136{
1137 struct greth_private *greth = netdev_priv(dev);
1138
1139 strlcpy(info->driver, dev_driver_string(greth->dev),
1140 sizeof(info->driver));
1141 strlcpy(info->version, "revision: 1.0", sizeof(info->version));
1142 strlcpy(info->bus_info, greth->dev->bus->name, sizeof(info->bus_info));
1143 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
1144}
1145
1146static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1147{
1148 int i;
1149 struct greth_private *greth = netdev_priv(dev);
1150 u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1151 u32 *buff = p;
1152
1153 for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1154 buff[i] = greth_read_bd(&greth_regs[i]);
1155}
1156
1157static const struct ethtool_ops greth_ethtool_ops = {
1158 .get_msglevel = greth_get_msglevel,
1159 .set_msglevel = greth_set_msglevel,
1160 .get_settings = greth_get_settings,
1161 .set_settings = greth_set_settings,
1162 .get_drvinfo = greth_get_drvinfo,
1163 .get_regs_len = greth_get_regs_len,
1164 .get_regs = greth_get_regs,
1165 .get_link = ethtool_op_get_link,
1166};
1167
1168static struct net_device_ops greth_netdev_ops = {
1169 .ndo_open = greth_open,
1170 .ndo_stop = greth_close,
1171 .ndo_start_xmit = greth_start_xmit,
1172 .ndo_set_mac_address = greth_set_mac_add,
1173 .ndo_validate_addr = eth_validate_addr,
1174};
1175
1176static inline int wait_for_mdio(struct greth_private *greth)
1177{
1178 unsigned long timeout = jiffies + 4*HZ/100;
1179 while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1180 if (time_after(jiffies, timeout))
1181 return 0;
1182 }
1183 return 1;
1184}
1185
1186static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1187{
1188 struct greth_private *greth = bus->priv;
1189 int data;
1190
1191 if (!wait_for_mdio(greth))
1192 return -EBUSY;
1193
1194 GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1195
1196 if (!wait_for_mdio(greth))
1197 return -EBUSY;
1198
1199 if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1200 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1201 return data;
1202
1203 } else {
1204 return -1;
1205 }
1206}
1207
1208static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1209{
1210 struct greth_private *greth = bus->priv;
1211
1212 if (!wait_for_mdio(greth))
1213 return -EBUSY;
1214
1215 GRETH_REGSAVE(greth->regs->mdio,
1216 ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1217
1218 if (!wait_for_mdio(greth))
1219 return -EBUSY;
1220
1221 return 0;
1222}
1223
1224static void greth_link_change(struct net_device *dev)
1225{
1226 struct greth_private *greth = netdev_priv(dev);
1227 struct phy_device *phydev = greth->phy;
1228 unsigned long flags;
1229 int status_change = 0;
1230 u32 ctrl;
1231
1232 spin_lock_irqsave(&greth->devlock, flags);
1233
1234 if (phydev->link) {
1235
1236 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1237 ctrl = GRETH_REGLOAD(greth->regs->control) &
1238 ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1239
1240 if (phydev->duplex)
1241 ctrl |= GRETH_CTRL_FD;
1242
1243 if (phydev->speed == SPEED_100)
1244 ctrl |= GRETH_CTRL_SP;
1245 else if (phydev->speed == SPEED_1000)
1246 ctrl |= GRETH_CTRL_GB;
1247
1248 GRETH_REGSAVE(greth->regs->control, ctrl);
1249 greth->speed = phydev->speed;
1250 greth->duplex = phydev->duplex;
1251 status_change = 1;
1252 }
1253 }
1254
1255 if (phydev->link != greth->link) {
1256 if (!phydev->link) {
1257 greth->speed = 0;
1258 greth->duplex = -1;
1259 }
1260 greth->link = phydev->link;
1261
1262 status_change = 1;
1263 }
1264
1265 spin_unlock_irqrestore(&greth->devlock, flags);
1266
1267 if (status_change) {
1268 if (phydev->link)
1269 pr_debug("%s: link up (%d/%s)\n",
1270 dev->name, phydev->speed,
1271 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1272 else
1273 pr_debug("%s: link down\n", dev->name);
1274 }
1275}
1276
1277static int greth_mdio_probe(struct net_device *dev)
1278{
1279 struct greth_private *greth = netdev_priv(dev);
1280 struct phy_device *phy = NULL;
1281 int ret;
1282
1283 /* Find the first PHY */
1284 phy = phy_find_first(greth->mdio);
1285
1286 if (!phy) {
1287 if (netif_msg_probe(greth))
1288 dev_err(&dev->dev, "no PHY found\n");
1289 return -ENXIO;
1290 }
1291
1292 ret = phy_connect_direct(dev, phy, &greth_link_change,
1293 greth->gbit_mac ? PHY_INTERFACE_MODE_GMII : PHY_INTERFACE_MODE_MII);
1294 if (ret) {
1295 if (netif_msg_ifup(greth))
1296 dev_err(&dev->dev, "could not attach to PHY\n");
1297 return ret;
1298 }
1299
1300 if (greth->gbit_mac)
1301 phy->supported &= PHY_GBIT_FEATURES;
1302 else
1303 phy->supported &= PHY_BASIC_FEATURES;
1304
1305 phy->advertising = phy->supported;
1306
1307 greth->link = 0;
1308 greth->speed = 0;
1309 greth->duplex = -1;
1310 greth->phy = phy;
1311
1312 return 0;
1313}
1314
1315static inline int phy_aneg_done(struct phy_device *phydev)
1316{
1317 int retval;
1318
1319 retval = phy_read(phydev, MII_BMSR);
1320
1321 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1322}
1323
1324static int greth_mdio_init(struct greth_private *greth)
1325{
1326 int ret, phy;
1327 unsigned long timeout;
1328
1329 greth->mdio = mdiobus_alloc();
1330 if (!greth->mdio) {
1331 return -ENOMEM;
1332 }
1333
1334 greth->mdio->name = "greth-mdio";
1335 snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1336 greth->mdio->read = greth_mdio_read;
1337 greth->mdio->write = greth_mdio_write;
1338 greth->mdio->priv = greth;
1339
1340 ret = mdiobus_register(greth->mdio);
1341 if (ret) {
1342 goto error;
1343 }
1344
1345 ret = greth_mdio_probe(greth->netdev);
1346 if (ret) {
1347 if (netif_msg_probe(greth))
1348 dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1349 goto unreg_mdio;
1350 }
1351
1352 phy_start(greth->phy);
1353
1354 /* If Ethernet debug link is used make autoneg happen right away */
1355 if (greth->edcl && greth_edcl == 1) {
1356 phy_start_aneg(greth->phy);
1357 timeout = jiffies + 6*HZ;
1358 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1359 }
1360 phy_read_status(greth->phy);
1361 greth_link_change(greth->netdev);
1362 }
1363
1364 return 0;
1365
1366unreg_mdio:
1367 mdiobus_unregister(greth->mdio);
1368error:
1369 mdiobus_free(greth->mdio);
1370 return ret;
1371}
1372
1373/* Initialize the GRETH MAC */
1374static int greth_of_probe(struct platform_device *ofdev)
1375{
1376 struct net_device *dev;
1377 struct greth_private *greth;
1378 struct greth_regs *regs;
1379
1380 int i;
1381 int err;
1382 int tmp;
1383 unsigned long timeout;
1384
1385 dev = alloc_etherdev(sizeof(struct greth_private));
1386
1387 if (dev == NULL)
1388 return -ENOMEM;
1389
1390 greth = netdev_priv(dev);
1391 greth->netdev = dev;
1392 greth->dev = &ofdev->dev;
1393
1394 if (greth_debug > 0)
1395 greth->msg_enable = greth_debug;
1396 else
1397 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1398
1399 spin_lock_init(&greth->devlock);
1400
1401 greth->regs = of_ioremap(&ofdev->resource[0], 0,
1402 resource_size(&ofdev->resource[0]),
1403 "grlib-greth regs");
1404
1405 if (greth->regs == NULL) {
1406 if (netif_msg_probe(greth))
1407 dev_err(greth->dev, "ioremap failure.\n");
1408 err = -EIO;
1409 goto error1;
1410 }
1411
1412 regs = greth->regs;
1413 greth->irq = ofdev->archdata.irqs[0];
1414
1415 dev_set_drvdata(greth->dev, dev);
1416 SET_NETDEV_DEV(dev, greth->dev);
1417
1418 if (netif_msg_probe(greth))
1419 dev_dbg(greth->dev, "resetting controller.\n");
1420
1421 /* Reset the controller. */
1422 GRETH_REGSAVE(regs->control, GRETH_RESET);
1423
1424 /* Wait for MAC to reset itself */
1425 timeout = jiffies + HZ/100;
1426 while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1427 if (time_after(jiffies, timeout)) {
1428 err = -EIO;
1429 if (netif_msg_probe(greth))
1430 dev_err(greth->dev, "timeout when waiting for reset.\n");
1431 goto error2;
1432 }
1433 }
1434
1435 /* Get default PHY address */
1436 greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1437
1438 /* Check if we have GBIT capable MAC */
1439 tmp = GRETH_REGLOAD(regs->control);
1440 greth->gbit_mac = (tmp >> 27) & 1;
1441
1442 /* Check for multicast capability */
1443 greth->multicast = (tmp >> 25) & 1;
1444
1445 greth->edcl = (tmp >> 31) & 1;
1446
1447 /* If we have EDCL we disable the EDCL speed-duplex FSM so
1448 * it doesn't interfere with the software */
1449 if (greth->edcl != 0)
1450 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1451
1452 /* Check if MAC can handle MDIO interrupts */
1453 greth->mdio_int_en = (tmp >> 26) & 1;
1454
1455 err = greth_mdio_init(greth);
1456 if (err) {
1457 if (netif_msg_probe(greth))
1458 dev_err(greth->dev, "failed to register MDIO bus\n");
1459 goto error2;
1460 }
1461
1462 /* Allocate TX descriptor ring in coherent memory */
1463 greth->tx_bd_base = dma_zalloc_coherent(greth->dev, 1024,
1464 &greth->tx_bd_base_phys,
1465 GFP_KERNEL);
1466 if (!greth->tx_bd_base) {
1467 err = -ENOMEM;
1468 goto error3;
1469 }
1470
1471 /* Allocate RX descriptor ring in coherent memory */
1472 greth->rx_bd_base = dma_zalloc_coherent(greth->dev, 1024,
1473 &greth->rx_bd_base_phys,
1474 GFP_KERNEL);
1475 if (!greth->rx_bd_base) {
1476 err = -ENOMEM;
1477 goto error4;
1478 }
1479
1480 /* Get MAC address from: module param, OF property or ID prom */
1481 for (i = 0; i < 6; i++) {
1482 if (macaddr[i] != 0)
1483 break;
1484 }
1485 if (i == 6) {
1486 const unsigned char *addr;
1487 int len;
1488 addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1489 &len);
1490 if (addr != NULL && len == 6) {
1491 for (i = 0; i < 6; i++)
1492 macaddr[i] = (unsigned int) addr[i];
1493 } else {
1494#ifdef CONFIG_SPARC
1495 for (i = 0; i < 6; i++)
1496 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1497#endif
1498 }
1499 }
1500
1501 for (i = 0; i < 6; i++)
1502 dev->dev_addr[i] = macaddr[i];
1503
1504 macaddr[5]++;
1505
1506 if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1507 if (netif_msg_probe(greth))
1508 dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1509 err = -EINVAL;
1510 goto error5;
1511 }
1512
1513 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1514 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1515 dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1516
1517 /* Clear all pending interrupts except PHY irq */
1518 GRETH_REGSAVE(regs->status, 0xFF);
1519
1520 if (greth->gbit_mac) {
1521 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1522 NETIF_F_RXCSUM;
1523 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1524 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1525 }
1526
1527 if (greth->multicast) {
1528 greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list;
1529 dev->flags |= IFF_MULTICAST;
1530 } else {
1531 dev->flags &= ~IFF_MULTICAST;
1532 }
1533
1534 dev->netdev_ops = &greth_netdev_ops;
1535 dev->ethtool_ops = &greth_ethtool_ops;
1536
1537 err = register_netdev(dev);
1538 if (err) {
1539 if (netif_msg_probe(greth))
1540 dev_err(greth->dev, "netdevice registration failed.\n");
1541 goto error5;
1542 }
1543
1544 /* setup NAPI */
1545 netif_napi_add(dev, &greth->napi, greth_poll, 64);
1546
1547 return 0;
1548
1549error5:
1550 dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1551error4:
1552 dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1553error3:
1554 mdiobus_unregister(greth->mdio);
1555error2:
1556 of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1557error1:
1558 free_netdev(dev);
1559 return err;
1560}
1561
1562static int greth_of_remove(struct platform_device *of_dev)
1563{
1564 struct net_device *ndev = platform_get_drvdata(of_dev);
1565 struct greth_private *greth = netdev_priv(ndev);
1566
1567 /* Free descriptor areas */
1568 dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1569
1570 dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1571
1572 if (greth->phy)
1573 phy_stop(greth->phy);
1574 mdiobus_unregister(greth->mdio);
1575
1576 unregister_netdev(ndev);
1577 free_netdev(ndev);
1578
1579 of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1580
1581 return 0;
1582}
1583
1584static const struct of_device_id greth_of_match[] = {
1585 {
1586 .name = "GAISLER_ETHMAC",
1587 },
1588 {
1589 .name = "01_01d",
1590 },
1591 {},
1592};
1593
1594MODULE_DEVICE_TABLE(of, greth_of_match);
1595
1596static struct platform_driver greth_of_driver = {
1597 .driver = {
1598 .name = "grlib-greth",
1599 .of_match_table = greth_of_match,
1600 },
1601 .probe = greth_of_probe,
1602 .remove = greth_of_remove,
1603};
1604
1605module_platform_driver(greth_of_driver);
1606
1607MODULE_AUTHOR("Aeroflex Gaisler AB.");
1608MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1609MODULE_LICENSE("GPL");