Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.git] / drivers / net / greth.c
1 /*
2  * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
3  *
4  * 2005-2009 (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/module.h>
26 #include <linux/uaccess.h>
27 #include <linux/init.h>
28 #include <linux/netdevice.h>
29 #include <linux/etherdevice.h>
30 #include <linux/ethtool.h>
31 #include <linux/skbuff.h>
32 #include <linux/io.h>
33 #include <linux/crc32.h>
34 #include <linux/mii.h>
35 #include <linux/of_device.h>
36 #include <linux/of_platform.h>
37 #include <linux/slab.h>
38 #include <asm/cacheflush.h>
39 #include <asm/byteorder.h>
40
41 #ifdef CONFIG_SPARC
42 #include <asm/idprom.h>
43 #endif
44
45 #include "greth.h"
46
47 #define GRETH_DEF_MSG_ENABLE      \
48         (NETIF_MSG_DRV          | \
49          NETIF_MSG_PROBE        | \
50          NETIF_MSG_LINK         | \
51          NETIF_MSG_IFDOWN       | \
52          NETIF_MSG_IFUP         | \
53          NETIF_MSG_RX_ERR       | \
54          NETIF_MSG_TX_ERR)
55
56 static int greth_debug = -1;    /* -1 == use GRETH_DEF_MSG_ENABLE as value */
57 module_param(greth_debug, int, 0);
58 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
59
60 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
61 static int macaddr[6];
62 module_param_array(macaddr, int, NULL, 0);
63 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
64
65 static int greth_edcl = 1;
66 module_param(greth_edcl, int, 0);
67 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
68
69 static int greth_open(struct net_device *dev);
70 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
71            struct net_device *dev);
72 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
73            struct net_device *dev);
74 static int greth_rx(struct net_device *dev, int limit);
75 static int greth_rx_gbit(struct net_device *dev, int limit);
76 static void greth_clean_tx(struct net_device *dev);
77 static void greth_clean_tx_gbit(struct net_device *dev);
78 static irqreturn_t greth_interrupt(int irq, void *dev_id);
79 static int greth_close(struct net_device *dev);
80 static int greth_set_mac_add(struct net_device *dev, void *p);
81 static void greth_set_multicast_list(struct net_device *dev);
82
83 #define GRETH_REGLOAD(a)            (be32_to_cpu(__raw_readl(&(a))))
84 #define GRETH_REGSAVE(a, v)         (__raw_writel(cpu_to_be32(v), &(a)))
85 #define GRETH_REGORIN(a, v)         (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
86 #define GRETH_REGANDIN(a, v)        (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
87
88 #define NEXT_TX(N)      (((N) + 1) & GRETH_TXBD_NUM_MASK)
89 #define SKIP_TX(N, C)   (((N) + C) & GRETH_TXBD_NUM_MASK)
90 #define NEXT_RX(N)      (((N) + 1) & GRETH_RXBD_NUM_MASK)
91
92 static void greth_print_rx_packet(void *addr, int len)
93 {
94         print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
95                         addr, len, true);
96 }
97
98 static void greth_print_tx_packet(struct sk_buff *skb)
99 {
100         int i;
101         int length;
102
103         if (skb_shinfo(skb)->nr_frags == 0)
104                 length = skb->len;
105         else
106                 length = skb_headlen(skb);
107
108         print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
109                         skb->data, length, true);
110
111         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
112
113                 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
114                                phys_to_virt(page_to_phys(skb_shinfo(skb)->frags[i].page)) +
115                                skb_shinfo(skb)->frags[i].page_offset,
116                                length, true);
117         }
118 }
119
120 static inline void greth_enable_tx(struct greth_private *greth)
121 {
122         wmb();
123         GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
124 }
125
126 static inline void greth_disable_tx(struct greth_private *greth)
127 {
128         GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
129 }
130
131 static inline void greth_enable_rx(struct greth_private *greth)
132 {
133         wmb();
134         GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
135 }
136
137 static inline void greth_disable_rx(struct greth_private *greth)
138 {
139         GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
140 }
141
142 static inline void greth_enable_irqs(struct greth_private *greth)
143 {
144         GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
145 }
146
147 static inline void greth_disable_irqs(struct greth_private *greth)
148 {
149         GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
150 }
151
152 static inline void greth_write_bd(u32 *bd, u32 val)
153 {
154         __raw_writel(cpu_to_be32(val), bd);
155 }
156
157 static inline u32 greth_read_bd(u32 *bd)
158 {
159         return be32_to_cpu(__raw_readl(bd));
160 }
161
162 static 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                                                frag->size,
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
229 static 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
330 cleanup:
331         greth_clean_rings(greth);
332         return -ENOMEM;
333 }
334
335 static 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         napi_enable(&greth->napi);
360
361         greth_enable_irqs(greth);
362         greth_enable_tx(greth);
363         greth_enable_rx(greth);
364         return 0;
365
366 }
367
368 static int greth_close(struct net_device *dev)
369 {
370         struct greth_private *greth = netdev_priv(dev);
371
372         napi_disable(&greth->napi);
373
374         greth_disable_tx(greth);
375
376         netif_stop_queue(dev);
377
378         free_irq(greth->irq, (void *) dev);
379
380         greth_clean_rings(greth);
381
382         return 0;
383 }
384
385 static netdev_tx_t
386 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
387 {
388         struct greth_private *greth = netdev_priv(dev);
389         struct greth_bd *bdp;
390         int err = NETDEV_TX_OK;
391         u32 status, dma_addr;
392
393         bdp = greth->tx_bd_base + greth->tx_next;
394
395         if (unlikely(greth->tx_free <= 0)) {
396                 netif_stop_queue(dev);
397                 return NETDEV_TX_BUSY;
398         }
399
400         if (netif_msg_pktdata(greth))
401                 greth_print_tx_packet(skb);
402
403
404         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
405                 dev->stats.tx_errors++;
406                 goto out;
407         }
408
409         dma_addr = greth_read_bd(&bdp->addr);
410
411         memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
412
413         dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
414
415         status = GRETH_BD_EN | (skb->len & GRETH_BD_LEN);
416
417         /* Wrap around descriptor ring */
418         if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
419                 status |= GRETH_BD_WR;
420         }
421
422         greth->tx_next = NEXT_TX(greth->tx_next);
423         greth->tx_free--;
424
425         /* No more descriptors */
426         if (unlikely(greth->tx_free == 0)) {
427
428                 /* Free transmitted descriptors */
429                 greth_clean_tx(dev);
430
431                 /* If nothing was cleaned, stop queue & wait for irq */
432                 if (unlikely(greth->tx_free == 0)) {
433                         status |= GRETH_BD_IE;
434                         netif_stop_queue(dev);
435                 }
436         }
437
438         /* Write descriptor control word and enable transmission */
439         greth_write_bd(&bdp->stat, status);
440         greth_enable_tx(greth);
441
442 out:
443         dev_kfree_skb(skb);
444         return err;
445 }
446
447
448 static netdev_tx_t
449 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
450 {
451         struct greth_private *greth = netdev_priv(dev);
452         struct greth_bd *bdp;
453         u32 status = 0, dma_addr;
454         int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
455
456         nr_frags = skb_shinfo(skb)->nr_frags;
457
458         if (greth->tx_free < nr_frags + 1) {
459                 netif_stop_queue(dev);
460                 err = NETDEV_TX_BUSY;
461                 goto out;
462         }
463
464         if (netif_msg_pktdata(greth))
465                 greth_print_tx_packet(skb);
466
467         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
468                 dev->stats.tx_errors++;
469                 goto out;
470         }
471
472         /* Save skb pointer. */
473         greth->tx_skbuff[greth->tx_next] = skb;
474
475         /* Linear buf */
476         if (nr_frags != 0)
477                 status = GRETH_TXBD_MORE;
478
479         status |= GRETH_TXBD_CSALL;
480         status |= skb_headlen(skb) & GRETH_BD_LEN;
481         if (greth->tx_next == GRETH_TXBD_NUM_MASK)
482                 status |= GRETH_BD_WR;
483
484
485         bdp = greth->tx_bd_base + greth->tx_next;
486         greth_write_bd(&bdp->stat, status);
487         dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
488
489         if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
490                 goto map_error;
491
492         greth_write_bd(&bdp->addr, dma_addr);
493
494         curr_tx = NEXT_TX(greth->tx_next);
495
496         /* Frags */
497         for (i = 0; i < nr_frags; i++) {
498                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
499                 greth->tx_skbuff[curr_tx] = NULL;
500                 bdp = greth->tx_bd_base + curr_tx;
501
502                 status = GRETH_TXBD_CSALL;
503                 status |= frag->size & GRETH_BD_LEN;
504
505                 /* Wrap around descriptor ring */
506                 if (curr_tx == GRETH_TXBD_NUM_MASK)
507                         status |= GRETH_BD_WR;
508
509                 /* More fragments left */
510                 if (i < nr_frags - 1)
511                         status |= GRETH_TXBD_MORE;
512
513                 /* ... last fragment, check if out of descriptors  */
514                 else if (greth->tx_free - nr_frags - 1 < (MAX_SKB_FRAGS + 1)) {
515
516                         /* Enable interrupts and stop queue */
517                         status |= GRETH_BD_IE;
518                         netif_stop_queue(dev);
519                 }
520
521                 greth_write_bd(&bdp->stat, status);
522
523                 dma_addr = dma_map_page(greth->dev,
524                                         frag->page,
525                                         frag->page_offset,
526                                         frag->size,
527                                         DMA_TO_DEVICE);
528
529                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
530                         goto frag_map_error;
531
532                 greth_write_bd(&bdp->addr, dma_addr);
533
534                 curr_tx = NEXT_TX(curr_tx);
535         }
536
537         wmb();
538
539         /* Enable the descriptors that we configured ...  */
540         for (i = 0; i < nr_frags + 1; i++) {
541                 bdp = greth->tx_bd_base + greth->tx_next;
542                 greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
543                 greth->tx_next = NEXT_TX(greth->tx_next);
544                 greth->tx_free--;
545         }
546
547         greth_enable_tx(greth);
548
549         return NETDEV_TX_OK;
550
551 frag_map_error:
552         /* Unmap SKB mappings that succeeded */
553         for (i = 0; greth->tx_next + i != curr_tx; i++) {
554                 bdp = greth->tx_bd_base + greth->tx_next + i;
555                 dma_unmap_single(greth->dev,
556                                  greth_read_bd(&bdp->addr),
557                                  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
558                                  DMA_TO_DEVICE);
559         }
560 map_error:
561         if (net_ratelimit())
562                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
563         dev_kfree_skb(skb);
564 out:
565         return err;
566 }
567
568
569 static irqreturn_t greth_interrupt(int irq, void *dev_id)
570 {
571         struct net_device *dev = dev_id;
572         struct greth_private *greth;
573         u32 status;
574         irqreturn_t retval = IRQ_NONE;
575
576         greth = netdev_priv(dev);
577
578         spin_lock(&greth->devlock);
579
580         /* Get the interrupt events that caused us to be here. */
581         status = GRETH_REGLOAD(greth->regs->status);
582
583         /* Handle rx and tx interrupts through poll */
584         if (status & (GRETH_INT_RX | GRETH_INT_TX)) {
585
586                 /* Clear interrupt status */
587                 GRETH_REGORIN(greth->regs->status,
588                               status & (GRETH_INT_RX | GRETH_INT_TX));
589
590                 retval = IRQ_HANDLED;
591
592                 /* Disable interrupts and schedule poll() */
593                 greth_disable_irqs(greth);
594                 napi_schedule(&greth->napi);
595         }
596
597         mmiowb();
598         spin_unlock(&greth->devlock);
599
600         return retval;
601 }
602
603 static void greth_clean_tx(struct net_device *dev)
604 {
605         struct greth_private *greth;
606         struct greth_bd *bdp;
607         u32 stat;
608
609         greth = netdev_priv(dev);
610
611         while (1) {
612                 bdp = greth->tx_bd_base + greth->tx_last;
613                 stat = greth_read_bd(&bdp->stat);
614
615                 if (unlikely(stat & GRETH_BD_EN))
616                         break;
617
618                 if (greth->tx_free == GRETH_TXBD_NUM)
619                         break;
620
621                 /* Check status for errors */
622                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
623                         dev->stats.tx_errors++;
624                         if (stat & GRETH_TXBD_ERR_AL)
625                                 dev->stats.tx_aborted_errors++;
626                         if (stat & GRETH_TXBD_ERR_UE)
627                                 dev->stats.tx_fifo_errors++;
628                 }
629                 dev->stats.tx_packets++;
630                 greth->tx_last = NEXT_TX(greth->tx_last);
631                 greth->tx_free++;
632         }
633
634         if (greth->tx_free > 0) {
635                 netif_wake_queue(dev);
636         }
637
638 }
639
640 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
641 {
642         /* Check status for errors */
643         if (unlikely(stat & GRETH_TXBD_STATUS)) {
644                 dev->stats.tx_errors++;
645                 if (stat & GRETH_TXBD_ERR_AL)
646                         dev->stats.tx_aborted_errors++;
647                 if (stat & GRETH_TXBD_ERR_UE)
648                         dev->stats.tx_fifo_errors++;
649                 if (stat & GRETH_TXBD_ERR_LC)
650                         dev->stats.tx_aborted_errors++;
651         }
652         dev->stats.tx_packets++;
653 }
654
655 static void greth_clean_tx_gbit(struct net_device *dev)
656 {
657         struct greth_private *greth;
658         struct greth_bd *bdp, *bdp_last_frag;
659         struct sk_buff *skb;
660         u32 stat;
661         int nr_frags, i;
662
663         greth = netdev_priv(dev);
664
665         while (greth->tx_free < GRETH_TXBD_NUM) {
666
667                 skb = greth->tx_skbuff[greth->tx_last];
668
669                 nr_frags = skb_shinfo(skb)->nr_frags;
670
671                 /* We only clean fully completed SKBs */
672                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
673                 stat = bdp_last_frag->stat;
674
675                 if (stat & GRETH_BD_EN)
676                         break;
677
678                 greth->tx_skbuff[greth->tx_last] = NULL;
679
680                 greth_update_tx_stats(dev, stat);
681
682                 bdp = greth->tx_bd_base + greth->tx_last;
683
684                 greth->tx_last = NEXT_TX(greth->tx_last);
685
686                 dma_unmap_single(greth->dev,
687                                  greth_read_bd(&bdp->addr),
688                                  skb_headlen(skb),
689                                  DMA_TO_DEVICE);
690
691                 for (i = 0; i < nr_frags; i++) {
692                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
693                         bdp = greth->tx_bd_base + greth->tx_last;
694
695                         dma_unmap_page(greth->dev,
696                                        greth_read_bd(&bdp->addr),
697                                        frag->size,
698                                        DMA_TO_DEVICE);
699
700                         greth->tx_last = NEXT_TX(greth->tx_last);
701                 }
702                 greth->tx_free += nr_frags+1;
703                 dev_kfree_skb(skb);
704         }
705         if (greth->tx_free > (MAX_SKB_FRAGS + 1)) {
706                 netif_wake_queue(dev);
707         }
708 }
709
710 static int greth_pending_packets(struct greth_private *greth)
711 {
712         struct greth_bd *bdp;
713         u32 status;
714         bdp = greth->rx_bd_base + greth->rx_cur;
715         status = greth_read_bd(&bdp->stat);
716         if (status & GRETH_BD_EN)
717                 return 0;
718         else
719                 return 1;
720 }
721
722 static int greth_rx(struct net_device *dev, int limit)
723 {
724         struct greth_private *greth;
725         struct greth_bd *bdp;
726         struct sk_buff *skb;
727         int pkt_len;
728         int bad, count;
729         u32 status, dma_addr;
730
731         greth = netdev_priv(dev);
732
733         for (count = 0; count < limit; ++count) {
734
735                 bdp = greth->rx_bd_base + greth->rx_cur;
736                 status = greth_read_bd(&bdp->stat);
737                 dma_addr = greth_read_bd(&bdp->addr);
738                 bad = 0;
739
740                 if (unlikely(status & GRETH_BD_EN)) {
741                         break;
742                 }
743
744                 /* Check status for errors. */
745                 if (unlikely(status & GRETH_RXBD_STATUS)) {
746                         if (status & GRETH_RXBD_ERR_FT) {
747                                 dev->stats.rx_length_errors++;
748                                 bad = 1;
749                         }
750                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
751                                 dev->stats.rx_frame_errors++;
752                                 bad = 1;
753                         }
754                         if (status & GRETH_RXBD_ERR_CRC) {
755                                 dev->stats.rx_crc_errors++;
756                                 bad = 1;
757                         }
758                 }
759                 if (unlikely(bad)) {
760                         dev->stats.rx_errors++;
761
762                 } else {
763
764                         pkt_len = status & GRETH_BD_LEN;
765
766                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
767
768                         if (unlikely(skb == NULL)) {
769
770                                 if (net_ratelimit())
771                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
772
773                                 dev->stats.rx_dropped++;
774
775                         } else {
776                                 skb_reserve(skb, NET_IP_ALIGN);
777                                 skb->dev = dev;
778
779                                 dma_sync_single_for_cpu(greth->dev,
780                                                         dma_addr,
781                                                         pkt_len,
782                                                         DMA_FROM_DEVICE);
783
784                                 if (netif_msg_pktdata(greth))
785                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
786
787                                 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
788
789                                 skb->protocol = eth_type_trans(skb, dev);
790                                 dev->stats.rx_packets++;
791                                 netif_receive_skb(skb);
792                         }
793                 }
794
795                 status = GRETH_BD_EN | GRETH_BD_IE;
796                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
797                         status |= GRETH_BD_WR;
798                 }
799
800                 wmb();
801                 greth_write_bd(&bdp->stat, status);
802
803                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
804
805                 greth_enable_rx(greth);
806
807                 greth->rx_cur = NEXT_RX(greth->rx_cur);
808         }
809
810         return count;
811 }
812
813 static inline int hw_checksummed(u32 status)
814 {
815
816         if (status & GRETH_RXBD_IP_FRAG)
817                 return 0;
818
819         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
820                 return 0;
821
822         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
823                 return 0;
824
825         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
826                 return 0;
827
828         return 1;
829 }
830
831 static int greth_rx_gbit(struct net_device *dev, int limit)
832 {
833         struct greth_private *greth;
834         struct greth_bd *bdp;
835         struct sk_buff *skb, *newskb;
836         int pkt_len;
837         int bad, count = 0;
838         u32 status, dma_addr;
839
840         greth = netdev_priv(dev);
841
842         for (count = 0; count < limit; ++count) {
843
844                 bdp = greth->rx_bd_base + greth->rx_cur;
845                 skb = greth->rx_skbuff[greth->rx_cur];
846                 status = greth_read_bd(&bdp->stat);
847                 bad = 0;
848
849                 if (status & GRETH_BD_EN)
850                         break;
851
852                 /* Check status for errors. */
853                 if (unlikely(status & GRETH_RXBD_STATUS)) {
854
855                         if (status & GRETH_RXBD_ERR_FT) {
856                                 dev->stats.rx_length_errors++;
857                                 bad = 1;
858                         } else if (status &
859                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
860                                 dev->stats.rx_frame_errors++;
861                                 bad = 1;
862                         } else if (status & GRETH_RXBD_ERR_CRC) {
863                                 dev->stats.rx_crc_errors++;
864                                 bad = 1;
865                         }
866                 }
867
868                 /* Allocate new skb to replace current */
869                 newskb = netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN);
870
871                 if (!bad && newskb) {
872                         skb_reserve(newskb, NET_IP_ALIGN);
873
874                         dma_addr = dma_map_single(greth->dev,
875                                                       newskb->data,
876                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
877                                                       DMA_FROM_DEVICE);
878
879                         if (!dma_mapping_error(greth->dev, dma_addr)) {
880                                 /* Process the incoming frame. */
881                                 pkt_len = status & GRETH_BD_LEN;
882
883                                 dma_unmap_single(greth->dev,
884                                                  greth_read_bd(&bdp->addr),
885                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
886                                                  DMA_FROM_DEVICE);
887
888                                 if (netif_msg_pktdata(greth))
889                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
890
891                                 skb_put(skb, pkt_len);
892
893                                 if (greth->flags & GRETH_FLAG_RX_CSUM && hw_checksummed(status))
894                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
895                                 else
896                                         skb->ip_summed = CHECKSUM_NONE;
897
898                                 skb->protocol = eth_type_trans(skb, dev);
899                                 dev->stats.rx_packets++;
900                                 netif_receive_skb(skb);
901
902                                 greth->rx_skbuff[greth->rx_cur] = newskb;
903                                 greth_write_bd(&bdp->addr, dma_addr);
904                         } else {
905                                 if (net_ratelimit())
906                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
907                                 dev_kfree_skb(newskb);
908                                 dev->stats.rx_dropped++;
909                         }
910                 } else {
911                         if (net_ratelimit())
912                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
913                         dev->stats.rx_dropped++;
914                 }
915
916                 status = GRETH_BD_EN | GRETH_BD_IE;
917                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
918                         status |= GRETH_BD_WR;
919                 }
920
921                 wmb();
922                 greth_write_bd(&bdp->stat, status);
923                 greth_enable_rx(greth);
924                 greth->rx_cur = NEXT_RX(greth->rx_cur);
925         }
926
927         return count;
928
929 }
930
931 static int greth_poll(struct napi_struct *napi, int budget)
932 {
933         struct greth_private *greth;
934         int work_done = 0;
935         greth = container_of(napi, struct greth_private, napi);
936
937         if (greth->gbit_mac) {
938                 greth_clean_tx_gbit(greth->netdev);
939         } else {
940                 greth_clean_tx(greth->netdev);
941         }
942
943 restart_poll:
944         if (greth->gbit_mac) {
945                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
946         } else {
947                 work_done += greth_rx(greth->netdev, budget - work_done);
948         }
949
950         if (work_done < budget) {
951
952                 napi_complete(napi);
953
954                 if (greth_pending_packets(greth)) {
955                         napi_reschedule(napi);
956                         goto restart_poll;
957                 }
958         }
959
960         greth_enable_irqs(greth);
961         return work_done;
962 }
963
964 static int greth_set_mac_add(struct net_device *dev, void *p)
965 {
966         struct sockaddr *addr = p;
967         struct greth_private *greth;
968         struct greth_regs *regs;
969
970         greth = netdev_priv(dev);
971         regs = (struct greth_regs *) greth->regs;
972
973         if (!is_valid_ether_addr(addr->sa_data))
974                 return -EINVAL;
975
976         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
977
978         GRETH_REGSAVE(regs->esa_msb, addr->sa_data[0] << 8 | addr->sa_data[1]);
979         GRETH_REGSAVE(regs->esa_lsb,
980                       addr->sa_data[2] << 24 | addr->
981                       sa_data[3] << 16 | addr->sa_data[4] << 8 | addr->sa_data[5]);
982         return 0;
983 }
984
985 static u32 greth_hash_get_index(__u8 *addr)
986 {
987         return (ether_crc(6, addr)) & 0x3F;
988 }
989
990 static void greth_set_hash_filter(struct net_device *dev)
991 {
992         struct netdev_hw_addr *ha;
993         struct greth_private *greth = netdev_priv(dev);
994         struct greth_regs *regs = (struct greth_regs *) greth->regs;
995         u32 mc_filter[2];
996         unsigned int bitnr;
997
998         mc_filter[0] = mc_filter[1] = 0;
999
1000         netdev_for_each_mc_addr(ha, dev) {
1001                 bitnr = greth_hash_get_index(ha->addr);
1002                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1003         }
1004
1005         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1006         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1007 }
1008
1009 static void greth_set_multicast_list(struct net_device *dev)
1010 {
1011         int cfg;
1012         struct greth_private *greth = netdev_priv(dev);
1013         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1014
1015         cfg = GRETH_REGLOAD(regs->control);
1016         if (dev->flags & IFF_PROMISC)
1017                 cfg |= GRETH_CTRL_PR;
1018         else
1019                 cfg &= ~GRETH_CTRL_PR;
1020
1021         if (greth->multicast) {
1022                 if (dev->flags & IFF_ALLMULTI) {
1023                         GRETH_REGSAVE(regs->hash_msb, -1);
1024                         GRETH_REGSAVE(regs->hash_lsb, -1);
1025                         cfg |= GRETH_CTRL_MCEN;
1026                         GRETH_REGSAVE(regs->control, cfg);
1027                         return;
1028                 }
1029
1030                 if (netdev_mc_empty(dev)) {
1031                         cfg &= ~GRETH_CTRL_MCEN;
1032                         GRETH_REGSAVE(regs->control, cfg);
1033                         return;
1034                 }
1035
1036                 /* Setup multicast filter */
1037                 greth_set_hash_filter(dev);
1038                 cfg |= GRETH_CTRL_MCEN;
1039         }
1040         GRETH_REGSAVE(regs->control, cfg);
1041 }
1042
1043 static u32 greth_get_msglevel(struct net_device *dev)
1044 {
1045         struct greth_private *greth = netdev_priv(dev);
1046         return greth->msg_enable;
1047 }
1048
1049 static void greth_set_msglevel(struct net_device *dev, u32 value)
1050 {
1051         struct greth_private *greth = netdev_priv(dev);
1052         greth->msg_enable = value;
1053 }
1054 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1055 {
1056         struct greth_private *greth = netdev_priv(dev);
1057         struct phy_device *phy = greth->phy;
1058
1059         if (!phy)
1060                 return -ENODEV;
1061
1062         return phy_ethtool_gset(phy, cmd);
1063 }
1064
1065 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1066 {
1067         struct greth_private *greth = netdev_priv(dev);
1068         struct phy_device *phy = greth->phy;
1069
1070         if (!phy)
1071                 return -ENODEV;
1072
1073         return phy_ethtool_sset(phy, cmd);
1074 }
1075
1076 static int greth_get_regs_len(struct net_device *dev)
1077 {
1078         return sizeof(struct greth_regs);
1079 }
1080
1081 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1082 {
1083         struct greth_private *greth = netdev_priv(dev);
1084
1085         strncpy(info->driver, dev_driver_string(greth->dev), 32);
1086         strncpy(info->version, "revision: 1.0", 32);
1087         strncpy(info->bus_info, greth->dev->bus->name, 32);
1088         strncpy(info->fw_version, "N/A", 32);
1089         info->eedump_len = 0;
1090         info->regdump_len = sizeof(struct greth_regs);
1091 }
1092
1093 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1094 {
1095         int i;
1096         struct greth_private *greth = netdev_priv(dev);
1097         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1098         u32 *buff = p;
1099
1100         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1101                 buff[i] = greth_read_bd(&greth_regs[i]);
1102 }
1103
1104 static u32 greth_get_rx_csum(struct net_device *dev)
1105 {
1106         struct greth_private *greth = netdev_priv(dev);
1107         return (greth->flags & GRETH_FLAG_RX_CSUM) != 0;
1108 }
1109
1110 static int greth_set_rx_csum(struct net_device *dev, u32 data)
1111 {
1112         struct greth_private *greth = netdev_priv(dev);
1113
1114         spin_lock_bh(&greth->devlock);
1115
1116         if (data)
1117                 greth->flags |= GRETH_FLAG_RX_CSUM;
1118         else
1119                 greth->flags &= ~GRETH_FLAG_RX_CSUM;
1120
1121         spin_unlock_bh(&greth->devlock);
1122
1123         return 0;
1124 }
1125
1126 static u32 greth_get_tx_csum(struct net_device *dev)
1127 {
1128         return (dev->features & NETIF_F_IP_CSUM) != 0;
1129 }
1130
1131 static int greth_set_tx_csum(struct net_device *dev, u32 data)
1132 {
1133         netif_tx_lock_bh(dev);
1134         ethtool_op_set_tx_csum(dev, data);
1135         netif_tx_unlock_bh(dev);
1136         return 0;
1137 }
1138
1139 static const struct ethtool_ops greth_ethtool_ops = {
1140         .get_msglevel           = greth_get_msglevel,
1141         .set_msglevel           = greth_set_msglevel,
1142         .get_settings           = greth_get_settings,
1143         .set_settings           = greth_set_settings,
1144         .get_drvinfo            = greth_get_drvinfo,
1145         .get_regs_len           = greth_get_regs_len,
1146         .get_regs               = greth_get_regs,
1147         .get_rx_csum            = greth_get_rx_csum,
1148         .set_rx_csum            = greth_set_rx_csum,
1149         .get_tx_csum            = greth_get_tx_csum,
1150         .set_tx_csum            = greth_set_tx_csum,
1151         .get_link               = ethtool_op_get_link,
1152 };
1153
1154 static struct net_device_ops greth_netdev_ops = {
1155         .ndo_open = greth_open,
1156         .ndo_stop = greth_close,
1157         .ndo_start_xmit = greth_start_xmit,
1158         .ndo_set_mac_address = greth_set_mac_add,
1159         .ndo_validate_addr      = eth_validate_addr,
1160 };
1161
1162 static inline int wait_for_mdio(struct greth_private *greth)
1163 {
1164         unsigned long timeout = jiffies + 4*HZ/100;
1165         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1166                 if (time_after(jiffies, timeout))
1167                         return 0;
1168         }
1169         return 1;
1170 }
1171
1172 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1173 {
1174         struct greth_private *greth = bus->priv;
1175         int data;
1176
1177         if (!wait_for_mdio(greth))
1178                 return -EBUSY;
1179
1180         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1181
1182         if (!wait_for_mdio(greth))
1183                 return -EBUSY;
1184
1185         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1186                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1187                 return data;
1188
1189         } else {
1190                 return -1;
1191         }
1192 }
1193
1194 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1195 {
1196         struct greth_private *greth = bus->priv;
1197
1198         if (!wait_for_mdio(greth))
1199                 return -EBUSY;
1200
1201         GRETH_REGSAVE(greth->regs->mdio,
1202                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1203
1204         if (!wait_for_mdio(greth))
1205                 return -EBUSY;
1206
1207         return 0;
1208 }
1209
1210 static int greth_mdio_reset(struct mii_bus *bus)
1211 {
1212         return 0;
1213 }
1214
1215 static void greth_link_change(struct net_device *dev)
1216 {
1217         struct greth_private *greth = netdev_priv(dev);
1218         struct phy_device *phydev = greth->phy;
1219         unsigned long flags;
1220
1221         int status_change = 0;
1222
1223         spin_lock_irqsave(&greth->devlock, flags);
1224
1225         if (phydev->link) {
1226
1227                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1228
1229                         GRETH_REGANDIN(greth->regs->control,
1230                                        ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB));
1231
1232                         if (phydev->duplex)
1233                                 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_FD);
1234
1235                         if (phydev->speed == SPEED_100) {
1236
1237                                 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_SP);
1238                         }
1239
1240                         else if (phydev->speed == SPEED_1000)
1241                                 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_GB);
1242
1243                         greth->speed = phydev->speed;
1244                         greth->duplex = phydev->duplex;
1245                         status_change = 1;
1246                 }
1247         }
1248
1249         if (phydev->link != greth->link) {
1250                 if (!phydev->link) {
1251                         greth->speed = 0;
1252                         greth->duplex = -1;
1253                 }
1254                 greth->link = phydev->link;
1255
1256                 status_change = 1;
1257         }
1258
1259         spin_unlock_irqrestore(&greth->devlock, flags);
1260
1261         if (status_change) {
1262                 if (phydev->link)
1263                         pr_debug("%s: link up (%d/%s)\n",
1264                                 dev->name, phydev->speed,
1265                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1266                 else
1267                         pr_debug("%s: link down\n", dev->name);
1268         }
1269 }
1270
1271 static int greth_mdio_probe(struct net_device *dev)
1272 {
1273         struct greth_private *greth = netdev_priv(dev);
1274         struct phy_device *phy = NULL;
1275         int ret;
1276
1277         /* Find the first PHY */
1278         phy = phy_find_first(greth->mdio);
1279
1280         if (!phy) {
1281                 if (netif_msg_probe(greth))
1282                         dev_err(&dev->dev, "no PHY found\n");
1283                 return -ENXIO;
1284         }
1285
1286         ret = phy_connect_direct(dev, phy, &greth_link_change,
1287                         0, greth->gbit_mac ?
1288                         PHY_INTERFACE_MODE_GMII :
1289                         PHY_INTERFACE_MODE_MII);
1290         if (ret) {
1291                 if (netif_msg_ifup(greth))
1292                         dev_err(&dev->dev, "could not attach to PHY\n");
1293                 return ret;
1294         }
1295
1296         if (greth->gbit_mac)
1297                 phy->supported &= PHY_GBIT_FEATURES;
1298         else
1299                 phy->supported &= PHY_BASIC_FEATURES;
1300
1301         phy->advertising = phy->supported;
1302
1303         greth->link = 0;
1304         greth->speed = 0;
1305         greth->duplex = -1;
1306         greth->phy = phy;
1307
1308         return 0;
1309 }
1310
1311 static inline int phy_aneg_done(struct phy_device *phydev)
1312 {
1313         int retval;
1314
1315         retval = phy_read(phydev, MII_BMSR);
1316
1317         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1318 }
1319
1320 static int greth_mdio_init(struct greth_private *greth)
1321 {
1322         int ret, phy;
1323         unsigned long timeout;
1324
1325         greth->mdio = mdiobus_alloc();
1326         if (!greth->mdio) {
1327                 return -ENOMEM;
1328         }
1329
1330         greth->mdio->name = "greth-mdio";
1331         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1332         greth->mdio->read = greth_mdio_read;
1333         greth->mdio->write = greth_mdio_write;
1334         greth->mdio->reset = greth_mdio_reset;
1335         greth->mdio->priv = greth;
1336
1337         greth->mdio->irq = greth->mdio_irqs;
1338
1339         for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1340                 greth->mdio->irq[phy] = PHY_POLL;
1341
1342         ret = mdiobus_register(greth->mdio);
1343         if (ret) {
1344                 goto error;
1345         }
1346
1347         ret = greth_mdio_probe(greth->netdev);
1348         if (ret) {
1349                 if (netif_msg_probe(greth))
1350                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1351                 goto unreg_mdio;
1352         }
1353
1354         phy_start(greth->phy);
1355
1356         /* If Ethernet debug link is used make autoneg happen right away */
1357         if (greth->edcl && greth_edcl == 1) {
1358                 phy_start_aneg(greth->phy);
1359                 timeout = jiffies + 6*HZ;
1360                 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1361                 }
1362                 genphy_read_status(greth->phy);
1363                 greth_link_change(greth->netdev);
1364         }
1365
1366         return 0;
1367
1368 unreg_mdio:
1369         mdiobus_unregister(greth->mdio);
1370 error:
1371         mdiobus_free(greth->mdio);
1372         return ret;
1373 }
1374
1375 /* Initialize the GRETH MAC */
1376 static int __devinit greth_of_probe(struct of_device *ofdev, const struct of_device_id *match)
1377 {
1378         struct net_device *dev;
1379         struct greth_private *greth;
1380         struct greth_regs *regs;
1381
1382         int i;
1383         int err;
1384         int tmp;
1385         unsigned long timeout;
1386
1387         dev = alloc_etherdev(sizeof(struct greth_private));
1388
1389         if (dev == NULL)
1390                 return -ENOMEM;
1391
1392         greth = netdev_priv(dev);
1393         greth->netdev = dev;
1394         greth->dev = &ofdev->dev;
1395
1396         if (greth_debug > 0)
1397                 greth->msg_enable = greth_debug;
1398         else
1399                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1400
1401         spin_lock_init(&greth->devlock);
1402
1403         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1404                                  resource_size(&ofdev->resource[0]),
1405                                  "grlib-greth regs");
1406
1407         if (greth->regs == NULL) {
1408                 if (netif_msg_probe(greth))
1409                         dev_err(greth->dev, "ioremap failure.\n");
1410                 err = -EIO;
1411                 goto error1;
1412         }
1413
1414         regs = (struct greth_regs *) greth->regs;
1415         greth->irq = ofdev->irqs[0];
1416
1417         dev_set_drvdata(greth->dev, dev);
1418         SET_NETDEV_DEV(dev, greth->dev);
1419
1420         if (netif_msg_probe(greth))
1421                 dev_dbg(greth->dev, "reseting controller.\n");
1422
1423         /* Reset the controller. */
1424         GRETH_REGSAVE(regs->control, GRETH_RESET);
1425
1426         /* Wait for MAC to reset itself */
1427         timeout = jiffies + HZ/100;
1428         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1429                 if (time_after(jiffies, timeout)) {
1430                         err = -EIO;
1431                         if (netif_msg_probe(greth))
1432                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1433                         goto error2;
1434                 }
1435         }
1436
1437         /* Get default PHY address  */
1438         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1439
1440         /* Check if we have GBIT capable MAC */
1441         tmp = GRETH_REGLOAD(regs->control);
1442         greth->gbit_mac = (tmp >> 27) & 1;
1443
1444         /* Check for multicast capability */
1445         greth->multicast = (tmp >> 25) & 1;
1446
1447         greth->edcl = (tmp >> 31) & 1;
1448
1449         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1450          * it doesn't interfere with the software */
1451         if (greth->edcl != 0)
1452                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1453
1454         /* Check if MAC can handle MDIO interrupts */
1455         greth->mdio_int_en = (tmp >> 26) & 1;
1456
1457         err = greth_mdio_init(greth);
1458         if (err) {
1459                 if (netif_msg_probe(greth))
1460                         dev_err(greth->dev, "failed to register MDIO bus\n");
1461                 goto error2;
1462         }
1463
1464         /* Allocate TX descriptor ring in coherent memory */
1465         greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1466                                                                    1024,
1467                                                                    &greth->tx_bd_base_phys,
1468                                                                    GFP_KERNEL);
1469
1470         if (!greth->tx_bd_base) {
1471                 if (netif_msg_probe(greth))
1472                         dev_err(&dev->dev, "could not allocate descriptor memory.\n");
1473                 err = -ENOMEM;
1474                 goto error3;
1475         }
1476
1477         memset(greth->tx_bd_base, 0, 1024);
1478
1479         /* Allocate RX descriptor ring in coherent memory */
1480         greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1481                                                                    1024,
1482                                                                    &greth->rx_bd_base_phys,
1483                                                                    GFP_KERNEL);
1484
1485         if (!greth->rx_bd_base) {
1486                 if (netif_msg_probe(greth))
1487                         dev_err(greth->dev, "could not allocate descriptor memory.\n");
1488                 err = -ENOMEM;
1489                 goto error4;
1490         }
1491
1492         memset(greth->rx_bd_base, 0, 1024);
1493
1494         /* Get MAC address from: module param, OF property or ID prom */
1495         for (i = 0; i < 6; i++) {
1496                 if (macaddr[i] != 0)
1497                         break;
1498         }
1499         if (i == 6) {
1500                 const unsigned char *addr;
1501                 int len;
1502                 addr = of_get_property(ofdev->node, "local-mac-address", &len);
1503                 if (addr != NULL && len == 6) {
1504                         for (i = 0; i < 6; i++)
1505                                 macaddr[i] = (unsigned int) addr[i];
1506                 } else {
1507 #ifdef CONFIG_SPARC
1508                         for (i = 0; i < 6; i++)
1509                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1510 #endif
1511                 }
1512         }
1513
1514         for (i = 0; i < 6; i++)
1515                 dev->dev_addr[i] = macaddr[i];
1516
1517         macaddr[5]++;
1518
1519         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1520                 if (netif_msg_probe(greth))
1521                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1522                 err = -EINVAL;
1523                 goto error5;
1524         }
1525
1526         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1527         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1528                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1529
1530         /* Clear all pending interrupts except PHY irq */
1531         GRETH_REGSAVE(regs->status, 0xFF);
1532
1533         if (greth->gbit_mac) {
1534                 dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_HIGHDMA;
1535                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1536                 greth->flags = GRETH_FLAG_RX_CSUM;
1537         }
1538
1539         if (greth->multicast) {
1540                 greth_netdev_ops.ndo_set_multicast_list = greth_set_multicast_list;
1541                 dev->flags |= IFF_MULTICAST;
1542         } else {
1543                 dev->flags &= ~IFF_MULTICAST;
1544         }
1545
1546         dev->netdev_ops = &greth_netdev_ops;
1547         dev->ethtool_ops = &greth_ethtool_ops;
1548
1549         if (register_netdev(dev)) {
1550                 if (netif_msg_probe(greth))
1551                         dev_err(greth->dev, "netdevice registration failed.\n");
1552                 err = -ENOMEM;
1553                 goto error5;
1554         }
1555
1556         /* setup NAPI */
1557         memset(&greth->napi, 0, sizeof(greth->napi));
1558         netif_napi_add(dev, &greth->napi, greth_poll, 64);
1559
1560         return 0;
1561
1562 error5:
1563         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1564 error4:
1565         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1566 error3:
1567         mdiobus_unregister(greth->mdio);
1568 error2:
1569         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1570 error1:
1571         free_netdev(dev);
1572         return err;
1573 }
1574
1575 static int __devexit greth_of_remove(struct of_device *of_dev)
1576 {
1577         struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
1578         struct greth_private *greth = netdev_priv(ndev);
1579
1580         /* Free descriptor areas */
1581         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1582
1583         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1584
1585         dev_set_drvdata(&of_dev->dev, NULL);
1586
1587         if (greth->phy)
1588                 phy_stop(greth->phy);
1589         mdiobus_unregister(greth->mdio);
1590
1591         unregister_netdev(ndev);
1592         free_netdev(ndev);
1593
1594         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1595
1596         return 0;
1597 }
1598
1599 static struct of_device_id greth_of_match[] = {
1600         {
1601          .name = "GAISLER_ETHMAC",
1602          },
1603         {},
1604 };
1605
1606 MODULE_DEVICE_TABLE(of, greth_of_match);
1607
1608 static struct of_platform_driver greth_of_driver = {
1609         .name = "grlib-greth",
1610         .match_table = greth_of_match,
1611         .probe = greth_of_probe,
1612         .remove = __devexit_p(greth_of_remove),
1613         .driver = {
1614                    .owner = THIS_MODULE,
1615                    .name = "grlib-greth",
1616                    },
1617 };
1618
1619 static int __init greth_init(void)
1620 {
1621         return of_register_platform_driver(&greth_of_driver);
1622 }
1623
1624 static void __exit greth_cleanup(void)
1625 {
1626         of_unregister_platform_driver(&greth_of_driver);
1627 }
1628
1629 module_init(greth_init);
1630 module_exit(greth_cleanup);
1631
1632 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1633 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1634 MODULE_LICENSE("GPL");