greth: fall through to common return statement on error
[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 <asm/cacheflush.h>
38 #include <asm/byteorder.h>
39
40 #ifdef CONFIG_SPARC
41 #include <asm/idprom.h>
42 #endif
43
44 #include "greth.h"
45
46 #define GRETH_DEF_MSG_ENABLE      \
47         (NETIF_MSG_DRV          | \
48          NETIF_MSG_PROBE        | \
49          NETIF_MSG_LINK         | \
50          NETIF_MSG_IFDOWN       | \
51          NETIF_MSG_IFUP         | \
52          NETIF_MSG_RX_ERR       | \
53          NETIF_MSG_TX_ERR)
54
55 static int greth_debug = -1;    /* -1 == use GRETH_DEF_MSG_ENABLE as value */
56 module_param(greth_debug, int, 0);
57 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
58
59 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
60 static int macaddr[6];
61 module_param_array(macaddr, int, NULL, 0);
62 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
63
64 static int greth_edcl = 1;
65 module_param(greth_edcl, int, 0);
66 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
67
68 static int greth_open(struct net_device *dev);
69 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
70            struct net_device *dev);
71 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
72            struct net_device *dev);
73 static int greth_rx(struct net_device *dev, int limit);
74 static int greth_rx_gbit(struct net_device *dev, int limit);
75 static void greth_clean_tx(struct net_device *dev);
76 static void greth_clean_tx_gbit(struct net_device *dev);
77 static irqreturn_t greth_interrupt(int irq, void *dev_id);
78 static int greth_close(struct net_device *dev);
79 static int greth_set_mac_add(struct net_device *dev, void *p);
80 static void greth_set_multicast_list(struct net_device *dev);
81
82 #define GRETH_REGLOAD(a)            (be32_to_cpu(__raw_readl(&(a))))
83 #define GRETH_REGSAVE(a, v)         (__raw_writel(cpu_to_be32(v), &(a)))
84 #define GRETH_REGORIN(a, v)         (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
85 #define GRETH_REGANDIN(a, v)        (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
86
87 #define NEXT_TX(N)      (((N) + 1) & GRETH_TXBD_NUM_MASK)
88 #define SKIP_TX(N, C)   (((N) + C) & GRETH_TXBD_NUM_MASK)
89 #define NEXT_RX(N)      (((N) + 1) & GRETH_RXBD_NUM_MASK)
90
91 static void greth_print_rx_packet(void *addr, int len)
92 {
93         print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
94                         addr, len, true);
95 }
96
97 static void greth_print_tx_packet(struct sk_buff *skb)
98 {
99         int i;
100         int length;
101
102         if (skb_shinfo(skb)->nr_frags == 0)
103                 length = skb->len;
104         else
105                 length = skb_headlen(skb);
106
107         print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
108                         skb->data, length, true);
109
110         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
111
112                 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
113                                phys_to_virt(page_to_phys(skb_shinfo(skb)->frags[i].page)) +
114                                skb_shinfo(skb)->frags[i].page_offset,
115                                length, true);
116         }
117 }
118
119 static inline void greth_enable_tx(struct greth_private *greth)
120 {
121         wmb();
122         GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
123 }
124
125 static inline void greth_disable_tx(struct greth_private *greth)
126 {
127         GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
128 }
129
130 static inline void greth_enable_rx(struct greth_private *greth)
131 {
132         wmb();
133         GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
134 }
135
136 static inline void greth_disable_rx(struct greth_private *greth)
137 {
138         GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
139 }
140
141 static inline void greth_enable_irqs(struct greth_private *greth)
142 {
143         GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
144 }
145
146 static inline void greth_disable_irqs(struct greth_private *greth)
147 {
148         GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
149 }
150
151 static inline void greth_write_bd(u32 *bd, u32 val)
152 {
153         __raw_writel(cpu_to_be32(val), bd);
154 }
155
156 static inline u32 greth_read_bd(u32 *bd)
157 {
158         return be32_to_cpu(__raw_readl(bd));
159 }
160
161 static void greth_clean_rings(struct greth_private *greth)
162 {
163         int i;
164         struct greth_bd *rx_bdp = greth->rx_bd_base;
165         struct greth_bd *tx_bdp = greth->tx_bd_base;
166
167         if (greth->gbit_mac) {
168
169                 /* Free and unmap RX buffers */
170                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
171                         if (greth->rx_skbuff[i] != NULL) {
172                                 dev_kfree_skb(greth->rx_skbuff[i]);
173                                 dma_unmap_single(greth->dev,
174                                                  greth_read_bd(&rx_bdp->addr),
175                                                  MAX_FRAME_SIZE+NET_IP_ALIGN,
176                                                  DMA_FROM_DEVICE);
177                         }
178                 }
179
180                 /* TX buffers */
181                 while (greth->tx_free < GRETH_TXBD_NUM) {
182
183                         struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
184                         int nr_frags = skb_shinfo(skb)->nr_frags;
185                         tx_bdp = greth->tx_bd_base + greth->tx_last;
186                         greth->tx_last = NEXT_TX(greth->tx_last);
187
188                         dma_unmap_single(greth->dev,
189                                          greth_read_bd(&tx_bdp->addr),
190                                          skb_headlen(skb),
191                                          DMA_TO_DEVICE);
192
193                         for (i = 0; i < nr_frags; i++) {
194                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
195                                 tx_bdp = greth->tx_bd_base + greth->tx_last;
196
197                                 dma_unmap_page(greth->dev,
198                                                greth_read_bd(&tx_bdp->addr),
199                                                frag->size,
200                                                DMA_TO_DEVICE);
201
202                                 greth->tx_last = NEXT_TX(greth->tx_last);
203                         }
204                         greth->tx_free += nr_frags+1;
205                         dev_kfree_skb(skb);
206                 }
207
208
209         } else { /* 10/100 Mbps MAC */
210
211                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
212                         kfree(greth->rx_bufs[i]);
213                         dma_unmap_single(greth->dev,
214                                          greth_read_bd(&rx_bdp->addr),
215                                          MAX_FRAME_SIZE,
216                                          DMA_FROM_DEVICE);
217                 }
218                 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
219                         kfree(greth->tx_bufs[i]);
220                         dma_unmap_single(greth->dev,
221                                          greth_read_bd(&tx_bdp->addr),
222                                          MAX_FRAME_SIZE,
223                                          DMA_TO_DEVICE);
224                 }
225         }
226 }
227
228 static int greth_init_rings(struct greth_private *greth)
229 {
230         struct sk_buff *skb;
231         struct greth_bd *rx_bd, *tx_bd;
232         u32 dma_addr;
233         int i;
234
235         rx_bd = greth->rx_bd_base;
236         tx_bd = greth->tx_bd_base;
237
238         /* Initialize descriptor rings and buffers */
239         if (greth->gbit_mac) {
240
241                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
242                         skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
243                         if (skb == NULL) {
244                                 if (netif_msg_ifup(greth))
245                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
246                                 goto cleanup;
247                         }
248                         skb_reserve(skb, NET_IP_ALIGN);
249                         dma_addr = dma_map_single(greth->dev,
250                                                   skb->data,
251                                                   MAX_FRAME_SIZE+NET_IP_ALIGN,
252                                                   DMA_FROM_DEVICE);
253
254                         if (dma_mapping_error(greth->dev, dma_addr)) {
255                                 if (netif_msg_ifup(greth))
256                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
257                                 goto cleanup;
258                         }
259                         greth->rx_skbuff[i] = skb;
260                         greth_write_bd(&rx_bd[i].addr, dma_addr);
261                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
262                 }
263
264         } else {
265
266                 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
267                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
268
269                         greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
270
271                         if (greth->rx_bufs[i] == NULL) {
272                                 if (netif_msg_ifup(greth))
273                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
274                                 goto cleanup;
275                         }
276
277                         dma_addr = dma_map_single(greth->dev,
278                                                   greth->rx_bufs[i],
279                                                   MAX_FRAME_SIZE,
280                                                   DMA_FROM_DEVICE);
281
282                         if (dma_mapping_error(greth->dev, dma_addr)) {
283                                 if (netif_msg_ifup(greth))
284                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
285                                 goto cleanup;
286                         }
287                         greth_write_bd(&rx_bd[i].addr, dma_addr);
288                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
289                 }
290                 for (i = 0; i < GRETH_TXBD_NUM; i++) {
291
292                         greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
293
294                         if (greth->tx_bufs[i] == NULL) {
295                                 if (netif_msg_ifup(greth))
296                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
297                                 goto cleanup;
298                         }
299
300                         dma_addr = dma_map_single(greth->dev,
301                                                   greth->tx_bufs[i],
302                                                   MAX_FRAME_SIZE,
303                                                   DMA_TO_DEVICE);
304
305                         if (dma_mapping_error(greth->dev, dma_addr)) {
306                                 if (netif_msg_ifup(greth))
307                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
308                                 goto cleanup;
309                         }
310                         greth_write_bd(&tx_bd[i].addr, dma_addr);
311                         greth_write_bd(&tx_bd[i].stat, 0);
312                 }
313         }
314         greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
315                        greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
316
317         /* Initialize pointers. */
318         greth->rx_cur = 0;
319         greth->tx_next = 0;
320         greth->tx_last = 0;
321         greth->tx_free = GRETH_TXBD_NUM;
322
323         /* Initialize descriptor base address */
324         GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
325         GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
326
327         return 0;
328
329 cleanup:
330         greth_clean_rings(greth);
331         return -ENOMEM;
332 }
333
334 static int greth_open(struct net_device *dev)
335 {
336         struct greth_private *greth = netdev_priv(dev);
337         int err;
338
339         err = greth_init_rings(greth);
340         if (err) {
341                 if (netif_msg_ifup(greth))
342                         dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
343                 return err;
344         }
345
346         err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
347         if (err) {
348                 if (netif_msg_ifup(greth))
349                         dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
350                 greth_clean_rings(greth);
351                 return err;
352         }
353
354         if (netif_msg_ifup(greth))
355                 dev_dbg(&dev->dev, " starting queue\n");
356         netif_start_queue(dev);
357
358         napi_enable(&greth->napi);
359
360         greth_enable_irqs(greth);
361         greth_enable_tx(greth);
362         greth_enable_rx(greth);
363         return 0;
364
365 }
366
367 static int greth_close(struct net_device *dev)
368 {
369         struct greth_private *greth = netdev_priv(dev);
370
371         napi_disable(&greth->napi);
372
373         greth_disable_tx(greth);
374
375         netif_stop_queue(dev);
376
377         free_irq(greth->irq, (void *) dev);
378
379         greth_clean_rings(greth);
380
381         return 0;
382 }
383
384 static netdev_tx_t
385 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
386 {
387         struct greth_private *greth = netdev_priv(dev);
388         struct greth_bd *bdp;
389         int err = NETDEV_TX_OK;
390         u32 status, dma_addr;
391
392         bdp = greth->tx_bd_base + greth->tx_next;
393
394         if (unlikely(greth->tx_free <= 0)) {
395                 netif_stop_queue(dev);
396                 return NETDEV_TX_BUSY;
397         }
398
399         if (netif_msg_pktdata(greth))
400                 greth_print_tx_packet(skb);
401
402
403         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
404                 dev->stats.tx_errors++;
405                 goto out;
406         }
407
408         dma_addr = greth_read_bd(&bdp->addr);
409
410         memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
411
412         dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
413
414         status = GRETH_BD_EN | (skb->len & GRETH_BD_LEN);
415
416         /* Wrap around descriptor ring */
417         if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
418                 status |= GRETH_BD_WR;
419         }
420
421         greth->tx_next = NEXT_TX(greth->tx_next);
422         greth->tx_free--;
423
424         /* No more descriptors */
425         if (unlikely(greth->tx_free == 0)) {
426
427                 /* Free transmitted descriptors */
428                 greth_clean_tx(dev);
429
430                 /* If nothing was cleaned, stop queue & wait for irq */
431                 if (unlikely(greth->tx_free == 0)) {
432                         status |= GRETH_BD_IE;
433                         netif_stop_queue(dev);
434                 }
435         }
436
437         /* Write descriptor control word and enable transmission */
438         greth_write_bd(&bdp->stat, status);
439         greth_enable_tx(greth);
440
441 out:
442         dev_kfree_skb(skb);
443         return err;
444 }
445
446
447 static netdev_tx_t
448 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
449 {
450         struct greth_private *greth = netdev_priv(dev);
451         struct greth_bd *bdp;
452         u32 status = 0, dma_addr;
453         int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
454
455         nr_frags = skb_shinfo(skb)->nr_frags;
456
457         if (greth->tx_free < nr_frags + 1) {
458                 netif_stop_queue(dev);
459                 err = NETDEV_TX_BUSY;
460                 goto out;
461         }
462
463         if (netif_msg_pktdata(greth))
464                 greth_print_tx_packet(skb);
465
466         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
467                 dev->stats.tx_errors++;
468                 goto out;
469         }
470
471         /* Save skb pointer. */
472         greth->tx_skbuff[greth->tx_next] = skb;
473
474         /* Linear buf */
475         if (nr_frags != 0)
476                 status = GRETH_TXBD_MORE;
477
478         status |= GRETH_TXBD_CSALL;
479         status |= skb_headlen(skb) & GRETH_BD_LEN;
480         if (greth->tx_next == GRETH_TXBD_NUM_MASK)
481                 status |= GRETH_BD_WR;
482
483
484         bdp = greth->tx_bd_base + greth->tx_next;
485         greth_write_bd(&bdp->stat, status);
486         dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
487
488         if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
489                 goto map_error;
490
491         greth_write_bd(&bdp->addr, dma_addr);
492
493         curr_tx = NEXT_TX(greth->tx_next);
494
495         /* Frags */
496         for (i = 0; i < nr_frags; i++) {
497                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
498                 greth->tx_skbuff[curr_tx] = NULL;
499                 bdp = greth->tx_bd_base + curr_tx;
500
501                 status = GRETH_TXBD_CSALL;
502                 status |= frag->size & GRETH_BD_LEN;
503
504                 /* Wrap around descriptor ring */
505                 if (curr_tx == GRETH_TXBD_NUM_MASK)
506                         status |= GRETH_BD_WR;
507
508                 /* More fragments left */
509                 if (i < nr_frags - 1)
510                         status |= GRETH_TXBD_MORE;
511
512                 /* ... last fragment, check if out of descriptors  */
513                 else if (greth->tx_free - nr_frags - 1 < (MAX_SKB_FRAGS + 1)) {
514
515                         /* Enable interrupts and stop queue */
516                         status |= GRETH_BD_IE;
517                         netif_stop_queue(dev);
518                 }
519
520                 greth_write_bd(&bdp->stat, status);
521
522                 dma_addr = dma_map_page(greth->dev,
523                                         frag->page,
524                                         frag->page_offset,
525                                         frag->size,
526                                         DMA_TO_DEVICE);
527
528                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
529                         goto frag_map_error;
530
531                 greth_write_bd(&bdp->addr, dma_addr);
532
533                 curr_tx = NEXT_TX(curr_tx);
534         }
535
536         wmb();
537
538         /* Enable the descriptors that we configured ...  */
539         for (i = 0; i < nr_frags + 1; i++) {
540                 bdp = greth->tx_bd_base + greth->tx_next;
541                 greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
542                 greth->tx_next = NEXT_TX(greth->tx_next);
543                 greth->tx_free--;
544         }
545
546         greth_enable_tx(greth);
547
548         return NETDEV_TX_OK;
549
550 frag_map_error:
551         /* Unmap SKB mappings that succeeded */
552         for (i = 0; greth->tx_next + i != curr_tx; i++) {
553                 bdp = greth->tx_bd_base + greth->tx_next + i;
554                 dma_unmap_single(greth->dev,
555                                  greth_read_bd(&bdp->addr),
556                                  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
557                                  DMA_TO_DEVICE);
558         }
559 map_error:
560         if (net_ratelimit())
561                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
562         dev_kfree_skb(skb);
563 out:
564         return err;
565 }
566
567
568 static irqreturn_t greth_interrupt(int irq, void *dev_id)
569 {
570         struct net_device *dev = dev_id;
571         struct greth_private *greth;
572         u32 status;
573         irqreturn_t retval = IRQ_NONE;
574
575         greth = netdev_priv(dev);
576
577         spin_lock(&greth->devlock);
578
579         /* Get the interrupt events that caused us to be here. */
580         status = GRETH_REGLOAD(greth->regs->status);
581
582         /* Handle rx and tx interrupts through poll */
583         if (status & (GRETH_INT_RX | GRETH_INT_TX)) {
584
585                 /* Clear interrupt status */
586                 GRETH_REGORIN(greth->regs->status,
587                               status & (GRETH_INT_RX | GRETH_INT_TX));
588
589                 retval = IRQ_HANDLED;
590
591                 /* Disable interrupts and schedule poll() */
592                 greth_disable_irqs(greth);
593                 napi_schedule(&greth->napi);
594         }
595
596         mmiowb();
597         spin_unlock(&greth->devlock);
598
599         return retval;
600 }
601
602 static void greth_clean_tx(struct net_device *dev)
603 {
604         struct greth_private *greth;
605         struct greth_bd *bdp;
606         u32 stat;
607
608         greth = netdev_priv(dev);
609
610         while (1) {
611                 bdp = greth->tx_bd_base + greth->tx_last;
612                 stat = greth_read_bd(&bdp->stat);
613
614                 if (unlikely(stat & GRETH_BD_EN))
615                         break;
616
617                 if (greth->tx_free == GRETH_TXBD_NUM)
618                         break;
619
620                 /* Check status for errors */
621                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
622                         dev->stats.tx_errors++;
623                         if (stat & GRETH_TXBD_ERR_AL)
624                                 dev->stats.tx_aborted_errors++;
625                         if (stat & GRETH_TXBD_ERR_UE)
626                                 dev->stats.tx_fifo_errors++;
627                 }
628                 dev->stats.tx_packets++;
629                 greth->tx_last = NEXT_TX(greth->tx_last);
630                 greth->tx_free++;
631         }
632
633         if (greth->tx_free > 0) {
634                 netif_wake_queue(dev);
635         }
636
637 }
638
639 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
640 {
641         /* Check status for errors */
642         if (unlikely(stat & GRETH_TXBD_STATUS)) {
643                 dev->stats.tx_errors++;
644                 if (stat & GRETH_TXBD_ERR_AL)
645                         dev->stats.tx_aborted_errors++;
646                 if (stat & GRETH_TXBD_ERR_UE)
647                         dev->stats.tx_fifo_errors++;
648                 if (stat & GRETH_TXBD_ERR_LC)
649                         dev->stats.tx_aborted_errors++;
650         }
651         dev->stats.tx_packets++;
652 }
653
654 static void greth_clean_tx_gbit(struct net_device *dev)
655 {
656         struct greth_private *greth;
657         struct greth_bd *bdp, *bdp_last_frag;
658         struct sk_buff *skb;
659         u32 stat;
660         int nr_frags, i;
661
662         greth = netdev_priv(dev);
663
664         while (greth->tx_free < GRETH_TXBD_NUM) {
665
666                 skb = greth->tx_skbuff[greth->tx_last];
667
668                 nr_frags = skb_shinfo(skb)->nr_frags;
669
670                 /* We only clean fully completed SKBs */
671                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
672                 stat = bdp_last_frag->stat;
673
674                 if (stat & GRETH_BD_EN)
675                         break;
676
677                 greth->tx_skbuff[greth->tx_last] = NULL;
678
679                 greth_update_tx_stats(dev, stat);
680
681                 bdp = greth->tx_bd_base + greth->tx_last;
682
683                 greth->tx_last = NEXT_TX(greth->tx_last);
684
685                 dma_unmap_single(greth->dev,
686                                  greth_read_bd(&bdp->addr),
687                                  skb_headlen(skb),
688                                  DMA_TO_DEVICE);
689
690                 for (i = 0; i < nr_frags; i++) {
691                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
692                         bdp = greth->tx_bd_base + greth->tx_last;
693
694                         dma_unmap_page(greth->dev,
695                                        greth_read_bd(&bdp->addr),
696                                        frag->size,
697                                        DMA_TO_DEVICE);
698
699                         greth->tx_last = NEXT_TX(greth->tx_last);
700                 }
701                 greth->tx_free += nr_frags+1;
702                 dev_kfree_skb(skb);
703         }
704         if (greth->tx_free > (MAX_SKB_FRAGS + 1)) {
705                 netif_wake_queue(dev);
706         }
707 }
708
709 static int greth_pending_packets(struct greth_private *greth)
710 {
711         struct greth_bd *bdp;
712         u32 status;
713         bdp = greth->rx_bd_base + greth->rx_cur;
714         status = greth_read_bd(&bdp->stat);
715         if (status & GRETH_BD_EN)
716                 return 0;
717         else
718                 return 1;
719 }
720
721 static int greth_rx(struct net_device *dev, int limit)
722 {
723         struct greth_private *greth;
724         struct greth_bd *bdp;
725         struct sk_buff *skb;
726         int pkt_len;
727         int bad, count;
728         u32 status, dma_addr;
729
730         greth = netdev_priv(dev);
731
732         for (count = 0; count < limit; ++count) {
733
734                 bdp = greth->rx_bd_base + greth->rx_cur;
735                 status = greth_read_bd(&bdp->stat);
736                 dma_addr = greth_read_bd(&bdp->addr);
737                 bad = 0;
738
739                 if (unlikely(status & GRETH_BD_EN)) {
740                         break;
741                 }
742
743                 /* Check status for errors. */
744                 if (unlikely(status & GRETH_RXBD_STATUS)) {
745                         if (status & GRETH_RXBD_ERR_FT) {
746                                 dev->stats.rx_length_errors++;
747                                 bad = 1;
748                         }
749                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
750                                 dev->stats.rx_frame_errors++;
751                                 bad = 1;
752                         }
753                         if (status & GRETH_RXBD_ERR_CRC) {
754                                 dev->stats.rx_crc_errors++;
755                                 bad = 1;
756                         }
757                 }
758                 if (unlikely(bad)) {
759                         dev->stats.rx_errors++;
760
761                 } else {
762
763                         pkt_len = status & GRETH_BD_LEN;
764
765                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
766
767                         if (unlikely(skb == NULL)) {
768
769                                 if (net_ratelimit())
770                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
771
772                                 dev->stats.rx_dropped++;
773
774                         } else {
775                                 skb_reserve(skb, NET_IP_ALIGN);
776                                 skb->dev = dev;
777
778                                 dma_sync_single_for_cpu(greth->dev,
779                                                         dma_addr,
780                                                         pkt_len,
781                                                         DMA_FROM_DEVICE);
782
783                                 if (netif_msg_pktdata(greth))
784                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
785
786                                 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
787
788                                 skb->protocol = eth_type_trans(skb, dev);
789                                 dev->stats.rx_packets++;
790                                 netif_receive_skb(skb);
791                         }
792                 }
793
794                 status = GRETH_BD_EN | GRETH_BD_IE;
795                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
796                         status |= GRETH_BD_WR;
797                 }
798
799                 wmb();
800                 greth_write_bd(&bdp->stat, status);
801
802                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
803
804                 greth_enable_rx(greth);
805
806                 greth->rx_cur = NEXT_RX(greth->rx_cur);
807         }
808
809         return count;
810 }
811
812 static inline int hw_checksummed(u32 status)
813 {
814
815         if (status & GRETH_RXBD_IP_FRAG)
816                 return 0;
817
818         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
819                 return 0;
820
821         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
822                 return 0;
823
824         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
825                 return 0;
826
827         return 1;
828 }
829
830 static int greth_rx_gbit(struct net_device *dev, int limit)
831 {
832         struct greth_private *greth;
833         struct greth_bd *bdp;
834         struct sk_buff *skb, *newskb;
835         int pkt_len;
836         int bad, count = 0;
837         u32 status, dma_addr;
838
839         greth = netdev_priv(dev);
840
841         for (count = 0; count < limit; ++count) {
842
843                 bdp = greth->rx_bd_base + greth->rx_cur;
844                 skb = greth->rx_skbuff[greth->rx_cur];
845                 status = greth_read_bd(&bdp->stat);
846                 bad = 0;
847
848                 if (status & GRETH_BD_EN)
849                         break;
850
851                 /* Check status for errors. */
852                 if (unlikely(status & GRETH_RXBD_STATUS)) {
853
854                         if (status & GRETH_RXBD_ERR_FT) {
855                                 dev->stats.rx_length_errors++;
856                                 bad = 1;
857                         } else if (status &
858                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
859                                 dev->stats.rx_frame_errors++;
860                                 bad = 1;
861                         } else if (status & GRETH_RXBD_ERR_CRC) {
862                                 dev->stats.rx_crc_errors++;
863                                 bad = 1;
864                         }
865                 }
866
867                 /* Allocate new skb to replace current */
868                 newskb = netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN);
869
870                 if (!bad && newskb) {
871                         skb_reserve(newskb, NET_IP_ALIGN);
872
873                         dma_addr = dma_map_single(greth->dev,
874                                                       newskb->data,
875                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
876                                                       DMA_FROM_DEVICE);
877
878                         if (!dma_mapping_error(greth->dev, dma_addr)) {
879                                 /* Process the incoming frame. */
880                                 pkt_len = status & GRETH_BD_LEN;
881
882                                 dma_unmap_single(greth->dev,
883                                                  greth_read_bd(&bdp->addr),
884                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
885                                                  DMA_FROM_DEVICE);
886
887                                 if (netif_msg_pktdata(greth))
888                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
889
890                                 skb_put(skb, pkt_len);
891
892                                 if (greth->flags & GRETH_FLAG_RX_CSUM && hw_checksummed(status))
893                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
894                                 else
895                                         skb->ip_summed = CHECKSUM_NONE;
896
897                                 skb->dev = dev;
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 dev_mc_list *curr;
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(curr, dev) {
1001                 bitnr = greth_hash_get_index(curr->dmi_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");