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