Merge branch 'master' of github.com:davem330/net
[linux-2.6.git] / drivers / net / ethernet / aeroflex / greth.c
1 /*
2  * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
3  *
4  * 2005-2010 (c) Aeroflex Gaisler AB
5  *
6  * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
7  * available in the GRLIB VHDL IP core library.
8  *
9  * Full documentation of both cores can be found here:
10  * http://www.gaisler.com/products/grlib/grip.pdf
11  *
12  * The Gigabit version supports scatter/gather DMA, any alignment of
13  * buffers and checksum offloading.
14  *
15  * This program is free software; you can redistribute it and/or modify it
16  * under the terms of the GNU General Public License as published by the
17  * Free Software Foundation; either version 2 of the License, or (at your
18  * option) any later version.
19  *
20  * Contributors: Kristoffer Glembo
21  *               Daniel Hellstrom
22  *               Marko Isomaki
23  */
24
25 #include <linux/dma-mapping.h>
26 #include <linux/module.h>
27 #include <linux/uaccess.h>
28 #include <linux/init.h>
29 #include <linux/interrupt.h>
30 #include <linux/netdevice.h>
31 #include <linux/etherdevice.h>
32 #include <linux/ethtool.h>
33 #include <linux/skbuff.h>
34 #include <linux/io.h>
35 #include <linux/crc32.h>
36 #include <linux/mii.h>
37 #include <linux/of_device.h>
38 #include <linux/of_platform.h>
39 #include <linux/slab.h>
40 #include <asm/cacheflush.h>
41 #include <asm/byteorder.h>
42
43 #ifdef CONFIG_SPARC
44 #include <asm/idprom.h>
45 #endif
46
47 #include "greth.h"
48
49 #define GRETH_DEF_MSG_ENABLE      \
50         (NETIF_MSG_DRV          | \
51          NETIF_MSG_PROBE        | \
52          NETIF_MSG_LINK         | \
53          NETIF_MSG_IFDOWN       | \
54          NETIF_MSG_IFUP         | \
55          NETIF_MSG_RX_ERR       | \
56          NETIF_MSG_TX_ERR)
57
58 static int greth_debug = -1;    /* -1 == use GRETH_DEF_MSG_ENABLE as value */
59 module_param(greth_debug, int, 0);
60 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
61
62 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
63 static int macaddr[6];
64 module_param_array(macaddr, int, NULL, 0);
65 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
66
67 static int greth_edcl = 1;
68 module_param(greth_edcl, int, 0);
69 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
70
71 static int greth_open(struct net_device *dev);
72 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
73            struct net_device *dev);
74 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
75            struct net_device *dev);
76 static int greth_rx(struct net_device *dev, int limit);
77 static int greth_rx_gbit(struct net_device *dev, int limit);
78 static void greth_clean_tx(struct net_device *dev);
79 static void greth_clean_tx_gbit(struct net_device *dev);
80 static irqreturn_t greth_interrupt(int irq, void *dev_id);
81 static int greth_close(struct net_device *dev);
82 static int greth_set_mac_add(struct net_device *dev, void *p);
83 static void greth_set_multicast_list(struct net_device *dev);
84
85 #define GRETH_REGLOAD(a)            (be32_to_cpu(__raw_readl(&(a))))
86 #define GRETH_REGSAVE(a, v)         (__raw_writel(cpu_to_be32(v), &(a)))
87 #define GRETH_REGORIN(a, v)         (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
88 #define GRETH_REGANDIN(a, v)        (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
89
90 #define NEXT_TX(N)      (((N) + 1) & GRETH_TXBD_NUM_MASK)
91 #define SKIP_TX(N, C)   (((N) + C) & GRETH_TXBD_NUM_MASK)
92 #define NEXT_RX(N)      (((N) + 1) & GRETH_RXBD_NUM_MASK)
93
94 static void greth_print_rx_packet(void *addr, int len)
95 {
96         print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
97                         addr, len, true);
98 }
99
100 static void greth_print_tx_packet(struct sk_buff *skb)
101 {
102         int i;
103         int length;
104
105         if (skb_shinfo(skb)->nr_frags == 0)
106                 length = skb->len;
107         else
108                 length = skb_headlen(skb);
109
110         print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
111                         skb->data, length, true);
112
113         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
114
115                 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
116                                skb_frag_address(&skb_shinfo(skb)->frags[i]),
117                                skb_shinfo(skb)->frags[i].size, true);
118         }
119 }
120
121 static inline void greth_enable_tx(struct greth_private *greth)
122 {
123         wmb();
124         GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
125 }
126
127 static inline void greth_disable_tx(struct greth_private *greth)
128 {
129         GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
130 }
131
132 static inline void greth_enable_rx(struct greth_private *greth)
133 {
134         wmb();
135         GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
136 }
137
138 static inline void greth_disable_rx(struct greth_private *greth)
139 {
140         GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
141 }
142
143 static inline void greth_enable_irqs(struct greth_private *greth)
144 {
145         GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
146 }
147
148 static inline void greth_disable_irqs(struct greth_private *greth)
149 {
150         GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
151 }
152
153 static inline void greth_write_bd(u32 *bd, u32 val)
154 {
155         __raw_writel(cpu_to_be32(val), bd);
156 }
157
158 static inline u32 greth_read_bd(u32 *bd)
159 {
160         return be32_to_cpu(__raw_readl(bd));
161 }
162
163 static void greth_clean_rings(struct greth_private *greth)
164 {
165         int i;
166         struct greth_bd *rx_bdp = greth->rx_bd_base;
167         struct greth_bd *tx_bdp = greth->tx_bd_base;
168
169         if (greth->gbit_mac) {
170
171                 /* Free and unmap RX buffers */
172                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
173                         if (greth->rx_skbuff[i] != NULL) {
174                                 dev_kfree_skb(greth->rx_skbuff[i]);
175                                 dma_unmap_single(greth->dev,
176                                                  greth_read_bd(&rx_bdp->addr),
177                                                  MAX_FRAME_SIZE+NET_IP_ALIGN,
178                                                  DMA_FROM_DEVICE);
179                         }
180                 }
181
182                 /* TX buffers */
183                 while (greth->tx_free < GRETH_TXBD_NUM) {
184
185                         struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
186                         int nr_frags = skb_shinfo(skb)->nr_frags;
187                         tx_bdp = greth->tx_bd_base + greth->tx_last;
188                         greth->tx_last = NEXT_TX(greth->tx_last);
189
190                         dma_unmap_single(greth->dev,
191                                          greth_read_bd(&tx_bdp->addr),
192                                          skb_headlen(skb),
193                                          DMA_TO_DEVICE);
194
195                         for (i = 0; i < nr_frags; i++) {
196                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
197                                 tx_bdp = greth->tx_bd_base + greth->tx_last;
198
199                                 dma_unmap_page(greth->dev,
200                                                greth_read_bd(&tx_bdp->addr),
201                                                frag->size,
202                                                DMA_TO_DEVICE);
203
204                                 greth->tx_last = NEXT_TX(greth->tx_last);
205                         }
206                         greth->tx_free += nr_frags+1;
207                         dev_kfree_skb(skb);
208                 }
209
210
211         } else { /* 10/100 Mbps MAC */
212
213                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
214                         kfree(greth->rx_bufs[i]);
215                         dma_unmap_single(greth->dev,
216                                          greth_read_bd(&rx_bdp->addr),
217                                          MAX_FRAME_SIZE,
218                                          DMA_FROM_DEVICE);
219                 }
220                 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
221                         kfree(greth->tx_bufs[i]);
222                         dma_unmap_single(greth->dev,
223                                          greth_read_bd(&tx_bdp->addr),
224                                          MAX_FRAME_SIZE,
225                                          DMA_TO_DEVICE);
226                 }
227         }
228 }
229
230 static int greth_init_rings(struct greth_private *greth)
231 {
232         struct sk_buff *skb;
233         struct greth_bd *rx_bd, *tx_bd;
234         u32 dma_addr;
235         int i;
236
237         rx_bd = greth->rx_bd_base;
238         tx_bd = greth->tx_bd_base;
239
240         /* Initialize descriptor rings and buffers */
241         if (greth->gbit_mac) {
242
243                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
244                         skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
245                         if (skb == NULL) {
246                                 if (netif_msg_ifup(greth))
247                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
248                                 goto cleanup;
249                         }
250                         skb_reserve(skb, NET_IP_ALIGN);
251                         dma_addr = dma_map_single(greth->dev,
252                                                   skb->data,
253                                                   MAX_FRAME_SIZE+NET_IP_ALIGN,
254                                                   DMA_FROM_DEVICE);
255
256                         if (dma_mapping_error(greth->dev, dma_addr)) {
257                                 if (netif_msg_ifup(greth))
258                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
259                                 goto cleanup;
260                         }
261                         greth->rx_skbuff[i] = skb;
262                         greth_write_bd(&rx_bd[i].addr, dma_addr);
263                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
264                 }
265
266         } else {
267
268                 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
269                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
270
271                         greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
272
273                         if (greth->rx_bufs[i] == NULL) {
274                                 if (netif_msg_ifup(greth))
275                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
276                                 goto cleanup;
277                         }
278
279                         dma_addr = dma_map_single(greth->dev,
280                                                   greth->rx_bufs[i],
281                                                   MAX_FRAME_SIZE,
282                                                   DMA_FROM_DEVICE);
283
284                         if (dma_mapping_error(greth->dev, dma_addr)) {
285                                 if (netif_msg_ifup(greth))
286                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
287                                 goto cleanup;
288                         }
289                         greth_write_bd(&rx_bd[i].addr, dma_addr);
290                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
291                 }
292                 for (i = 0; i < GRETH_TXBD_NUM; i++) {
293
294                         greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
295
296                         if (greth->tx_bufs[i] == NULL) {
297                                 if (netif_msg_ifup(greth))
298                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
299                                 goto cleanup;
300                         }
301
302                         dma_addr = dma_map_single(greth->dev,
303                                                   greth->tx_bufs[i],
304                                                   MAX_FRAME_SIZE,
305                                                   DMA_TO_DEVICE);
306
307                         if (dma_mapping_error(greth->dev, dma_addr)) {
308                                 if (netif_msg_ifup(greth))
309                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
310                                 goto cleanup;
311                         }
312                         greth_write_bd(&tx_bd[i].addr, dma_addr);
313                         greth_write_bd(&tx_bd[i].stat, 0);
314                 }
315         }
316         greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
317                        greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
318
319         /* Initialize pointers. */
320         greth->rx_cur = 0;
321         greth->tx_next = 0;
322         greth->tx_last = 0;
323         greth->tx_free = GRETH_TXBD_NUM;
324
325         /* Initialize descriptor base address */
326         GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
327         GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
328
329         return 0;
330
331 cleanup:
332         greth_clean_rings(greth);
333         return -ENOMEM;
334 }
335
336 static int greth_open(struct net_device *dev)
337 {
338         struct greth_private *greth = netdev_priv(dev);
339         int err;
340
341         err = greth_init_rings(greth);
342         if (err) {
343                 if (netif_msg_ifup(greth))
344                         dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
345                 return err;
346         }
347
348         err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
349         if (err) {
350                 if (netif_msg_ifup(greth))
351                         dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
352                 greth_clean_rings(greth);
353                 return err;
354         }
355
356         if (netif_msg_ifup(greth))
357                 dev_dbg(&dev->dev, " starting queue\n");
358         netif_start_queue(dev);
359
360         GRETH_REGSAVE(greth->regs->status, 0xFF);
361
362         napi_enable(&greth->napi);
363
364         greth_enable_irqs(greth);
365         greth_enable_tx(greth);
366         greth_enable_rx(greth);
367         return 0;
368
369 }
370
371 static int greth_close(struct net_device *dev)
372 {
373         struct greth_private *greth = netdev_priv(dev);
374
375         napi_disable(&greth->napi);
376
377         greth_disable_irqs(greth);
378         greth_disable_tx(greth);
379         greth_disable_rx(greth);
380
381         netif_stop_queue(dev);
382
383         free_irq(greth->irq, (void *) dev);
384
385         greth_clean_rings(greth);
386
387         return 0;
388 }
389
390 static netdev_tx_t
391 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
392 {
393         struct greth_private *greth = netdev_priv(dev);
394         struct greth_bd *bdp;
395         int err = NETDEV_TX_OK;
396         u32 status, dma_addr, ctrl;
397         unsigned long flags;
398
399         /* Clean TX Ring */
400         greth_clean_tx(greth->netdev);
401
402         if (unlikely(greth->tx_free <= 0)) {
403                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
404                 ctrl = GRETH_REGLOAD(greth->regs->control);
405                 /* Enable TX IRQ only if not already in poll() routine */
406                 if (ctrl & GRETH_RXI)
407                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
408                 netif_stop_queue(dev);
409                 spin_unlock_irqrestore(&greth->devlock, flags);
410                 return NETDEV_TX_BUSY;
411         }
412
413         if (netif_msg_pktdata(greth))
414                 greth_print_tx_packet(skb);
415
416
417         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
418                 dev->stats.tx_errors++;
419                 goto out;
420         }
421
422         bdp = greth->tx_bd_base + greth->tx_next;
423         dma_addr = greth_read_bd(&bdp->addr);
424
425         memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
426
427         dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
428
429         status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
430         greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;
431
432         /* Wrap around descriptor ring */
433         if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
434                 status |= GRETH_BD_WR;
435         }
436
437         greth->tx_next = NEXT_TX(greth->tx_next);
438         greth->tx_free--;
439
440         /* Write descriptor control word and enable transmission */
441         greth_write_bd(&bdp->stat, status);
442         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
443         greth_enable_tx(greth);
444         spin_unlock_irqrestore(&greth->devlock, flags);
445
446 out:
447         dev_kfree_skb(skb);
448         return err;
449 }
450
451
452 static netdev_tx_t
453 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
454 {
455         struct greth_private *greth = netdev_priv(dev);
456         struct greth_bd *bdp;
457         u32 status = 0, dma_addr, ctrl;
458         int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
459         unsigned long flags;
460
461         nr_frags = skb_shinfo(skb)->nr_frags;
462
463         /* Clean TX Ring */
464         greth_clean_tx_gbit(dev);
465
466         if (greth->tx_free < nr_frags + 1) {
467                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
468                 ctrl = GRETH_REGLOAD(greth->regs->control);
469                 /* Enable TX IRQ only if not already in poll() routine */
470                 if (ctrl & GRETH_RXI)
471                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
472                 netif_stop_queue(dev);
473                 spin_unlock_irqrestore(&greth->devlock, flags);
474                 err = NETDEV_TX_BUSY;
475                 goto out;
476         }
477
478         if (netif_msg_pktdata(greth))
479                 greth_print_tx_packet(skb);
480
481         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
482                 dev->stats.tx_errors++;
483                 goto out;
484         }
485
486         /* Save skb pointer. */
487         greth->tx_skbuff[greth->tx_next] = skb;
488
489         /* Linear buf */
490         if (nr_frags != 0)
491                 status = GRETH_TXBD_MORE;
492
493         if (skb->ip_summed == CHECKSUM_PARTIAL)
494                 status |= GRETH_TXBD_CSALL;
495         status |= skb_headlen(skb) & GRETH_BD_LEN;
496         if (greth->tx_next == GRETH_TXBD_NUM_MASK)
497                 status |= GRETH_BD_WR;
498
499
500         bdp = greth->tx_bd_base + greth->tx_next;
501         greth_write_bd(&bdp->stat, status);
502         dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
503
504         if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
505                 goto map_error;
506
507         greth_write_bd(&bdp->addr, dma_addr);
508
509         curr_tx = NEXT_TX(greth->tx_next);
510
511         /* Frags */
512         for (i = 0; i < nr_frags; i++) {
513                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
514                 greth->tx_skbuff[curr_tx] = NULL;
515                 bdp = greth->tx_bd_base + curr_tx;
516
517                 status = GRETH_BD_EN;
518                 if (skb->ip_summed == CHECKSUM_PARTIAL)
519                         status |= GRETH_TXBD_CSALL;
520                 status |= frag->size & GRETH_BD_LEN;
521
522                 /* Wrap around descriptor ring */
523                 if (curr_tx == GRETH_TXBD_NUM_MASK)
524                         status |= GRETH_BD_WR;
525
526                 /* More fragments left */
527                 if (i < nr_frags - 1)
528                         status |= GRETH_TXBD_MORE;
529                 else
530                         status |= GRETH_BD_IE; /* enable IRQ on last fragment */
531
532                 greth_write_bd(&bdp->stat, status);
533
534                 dma_addr = skb_frag_dma_map(greth->dev, frag, 0, frag->size,
535                                             DMA_TO_DEVICE);
536
537                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
538                         goto frag_map_error;
539
540                 greth_write_bd(&bdp->addr, dma_addr);
541
542                 curr_tx = NEXT_TX(curr_tx);
543         }
544
545         wmb();
546
547         /* Enable the descriptor chain by enabling the first descriptor */
548         bdp = greth->tx_bd_base + greth->tx_next;
549         greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
550         greth->tx_next = curr_tx;
551         greth->tx_free -= nr_frags + 1;
552
553         wmb();
554
555         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
556         greth_enable_tx(greth);
557         spin_unlock_irqrestore(&greth->devlock, flags);
558
559         return NETDEV_TX_OK;
560
561 frag_map_error:
562         /* Unmap SKB mappings that succeeded and disable descriptor */
563         for (i = 0; greth->tx_next + i != curr_tx; i++) {
564                 bdp = greth->tx_bd_base + greth->tx_next + i;
565                 dma_unmap_single(greth->dev,
566                                  greth_read_bd(&bdp->addr),
567                                  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
568                                  DMA_TO_DEVICE);
569                 greth_write_bd(&bdp->stat, 0);
570         }
571 map_error:
572         if (net_ratelimit())
573                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
574         dev_kfree_skb(skb);
575 out:
576         return err;
577 }
578
579 static irqreturn_t greth_interrupt(int irq, void *dev_id)
580 {
581         struct net_device *dev = dev_id;
582         struct greth_private *greth;
583         u32 status, ctrl;
584         irqreturn_t retval = IRQ_NONE;
585
586         greth = netdev_priv(dev);
587
588         spin_lock(&greth->devlock);
589
590         /* Get the interrupt events that caused us to be here. */
591         status = GRETH_REGLOAD(greth->regs->status);
592
593         /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
594          * set regardless of whether IRQ is enabled or not. Especially
595          * important when shared IRQ.
596          */
597         ctrl = GRETH_REGLOAD(greth->regs->control);
598
599         /* Handle rx and tx interrupts through poll */
600         if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
601             ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
602                 retval = IRQ_HANDLED;
603
604                 /* Disable interrupts and schedule poll() */
605                 greth_disable_irqs(greth);
606                 napi_schedule(&greth->napi);
607         }
608
609         mmiowb();
610         spin_unlock(&greth->devlock);
611
612         return retval;
613 }
614
615 static void greth_clean_tx(struct net_device *dev)
616 {
617         struct greth_private *greth;
618         struct greth_bd *bdp;
619         u32 stat;
620
621         greth = netdev_priv(dev);
622
623         while (1) {
624                 bdp = greth->tx_bd_base + greth->tx_last;
625                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
626                 mb();
627                 stat = greth_read_bd(&bdp->stat);
628
629                 if (unlikely(stat & GRETH_BD_EN))
630                         break;
631
632                 if (greth->tx_free == GRETH_TXBD_NUM)
633                         break;
634
635                 /* Check status for errors */
636                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
637                         dev->stats.tx_errors++;
638                         if (stat & GRETH_TXBD_ERR_AL)
639                                 dev->stats.tx_aborted_errors++;
640                         if (stat & GRETH_TXBD_ERR_UE)
641                                 dev->stats.tx_fifo_errors++;
642                 }
643                 dev->stats.tx_packets++;
644                 dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
645                 greth->tx_last = NEXT_TX(greth->tx_last);
646                 greth->tx_free++;
647         }
648
649         if (greth->tx_free > 0) {
650                 netif_wake_queue(dev);
651         }
652
653 }
654
655 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
656 {
657         /* Check status for errors */
658         if (unlikely(stat & GRETH_TXBD_STATUS)) {
659                 dev->stats.tx_errors++;
660                 if (stat & GRETH_TXBD_ERR_AL)
661                         dev->stats.tx_aborted_errors++;
662                 if (stat & GRETH_TXBD_ERR_UE)
663                         dev->stats.tx_fifo_errors++;
664                 if (stat & GRETH_TXBD_ERR_LC)
665                         dev->stats.tx_aborted_errors++;
666         }
667         dev->stats.tx_packets++;
668 }
669
670 static void greth_clean_tx_gbit(struct net_device *dev)
671 {
672         struct greth_private *greth;
673         struct greth_bd *bdp, *bdp_last_frag;
674         struct sk_buff *skb;
675         u32 stat;
676         int nr_frags, i;
677
678         greth = netdev_priv(dev);
679
680         while (greth->tx_free < GRETH_TXBD_NUM) {
681
682                 skb = greth->tx_skbuff[greth->tx_last];
683
684                 nr_frags = skb_shinfo(skb)->nr_frags;
685
686                 /* We only clean fully completed SKBs */
687                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
688
689                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
690                 mb();
691                 stat = greth_read_bd(&bdp_last_frag->stat);
692
693                 if (stat & GRETH_BD_EN)
694                         break;
695
696                 greth->tx_skbuff[greth->tx_last] = NULL;
697
698                 greth_update_tx_stats(dev, stat);
699                 dev->stats.tx_bytes += skb->len;
700
701                 bdp = greth->tx_bd_base + greth->tx_last;
702
703                 greth->tx_last = NEXT_TX(greth->tx_last);
704
705                 dma_unmap_single(greth->dev,
706                                  greth_read_bd(&bdp->addr),
707                                  skb_headlen(skb),
708                                  DMA_TO_DEVICE);
709
710                 for (i = 0; i < nr_frags; i++) {
711                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
712                         bdp = greth->tx_bd_base + greth->tx_last;
713
714                         dma_unmap_page(greth->dev,
715                                        greth_read_bd(&bdp->addr),
716                                        frag->size,
717                                        DMA_TO_DEVICE);
718
719                         greth->tx_last = NEXT_TX(greth->tx_last);
720                 }
721                 greth->tx_free += nr_frags+1;
722                 dev_kfree_skb(skb);
723         }
724
725         if (netif_queue_stopped(dev) && (greth->tx_free > (MAX_SKB_FRAGS+1)))
726                 netif_wake_queue(dev);
727 }
728
729 static int greth_rx(struct net_device *dev, int limit)
730 {
731         struct greth_private *greth;
732         struct greth_bd *bdp;
733         struct sk_buff *skb;
734         int pkt_len;
735         int bad, count;
736         u32 status, dma_addr;
737         unsigned long flags;
738
739         greth = netdev_priv(dev);
740
741         for (count = 0; count < limit; ++count) {
742
743                 bdp = greth->rx_bd_base + greth->rx_cur;
744                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
745                 mb();
746                 status = greth_read_bd(&bdp->stat);
747
748                 if (unlikely(status & GRETH_BD_EN)) {
749                         break;
750                 }
751
752                 dma_addr = greth_read_bd(&bdp->addr);
753                 bad = 0;
754
755                 /* Check status for errors. */
756                 if (unlikely(status & GRETH_RXBD_STATUS)) {
757                         if (status & GRETH_RXBD_ERR_FT) {
758                                 dev->stats.rx_length_errors++;
759                                 bad = 1;
760                         }
761                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
762                                 dev->stats.rx_frame_errors++;
763                                 bad = 1;
764                         }
765                         if (status & GRETH_RXBD_ERR_CRC) {
766                                 dev->stats.rx_crc_errors++;
767                                 bad = 1;
768                         }
769                 }
770                 if (unlikely(bad)) {
771                         dev->stats.rx_errors++;
772
773                 } else {
774
775                         pkt_len = status & GRETH_BD_LEN;
776
777                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
778
779                         if (unlikely(skb == NULL)) {
780
781                                 if (net_ratelimit())
782                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
783
784                                 dev->stats.rx_dropped++;
785
786                         } else {
787                                 skb_reserve(skb, NET_IP_ALIGN);
788                                 skb->dev = dev;
789
790                                 dma_sync_single_for_cpu(greth->dev,
791                                                         dma_addr,
792                                                         pkt_len,
793                                                         DMA_FROM_DEVICE);
794
795                                 if (netif_msg_pktdata(greth))
796                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
797
798                                 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
799
800                                 skb->protocol = eth_type_trans(skb, dev);
801                                 dev->stats.rx_bytes += pkt_len;
802                                 dev->stats.rx_packets++;
803                                 netif_receive_skb(skb);
804                         }
805                 }
806
807                 status = GRETH_BD_EN | GRETH_BD_IE;
808                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
809                         status |= GRETH_BD_WR;
810                 }
811
812                 wmb();
813                 greth_write_bd(&bdp->stat, status);
814
815                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
816
817                 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
818                 greth_enable_rx(greth);
819                 spin_unlock_irqrestore(&greth->devlock, flags);
820
821                 greth->rx_cur = NEXT_RX(greth->rx_cur);
822         }
823
824         return count;
825 }
826
827 static inline int hw_checksummed(u32 status)
828 {
829
830         if (status & GRETH_RXBD_IP_FRAG)
831                 return 0;
832
833         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
834                 return 0;
835
836         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
837                 return 0;
838
839         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
840                 return 0;
841
842         return 1;
843 }
844
845 static int greth_rx_gbit(struct net_device *dev, int limit)
846 {
847         struct greth_private *greth;
848         struct greth_bd *bdp;
849         struct sk_buff *skb, *newskb;
850         int pkt_len;
851         int bad, count = 0;
852         u32 status, dma_addr;
853         unsigned long flags;
854
855         greth = netdev_priv(dev);
856
857         for (count = 0; count < limit; ++count) {
858
859                 bdp = greth->rx_bd_base + greth->rx_cur;
860                 skb = greth->rx_skbuff[greth->rx_cur];
861                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
862                 mb();
863                 status = greth_read_bd(&bdp->stat);
864                 bad = 0;
865
866                 if (status & GRETH_BD_EN)
867                         break;
868
869                 /* Check status for errors. */
870                 if (unlikely(status & GRETH_RXBD_STATUS)) {
871
872                         if (status & GRETH_RXBD_ERR_FT) {
873                                 dev->stats.rx_length_errors++;
874                                 bad = 1;
875                         } else if (status &
876                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
877                                 dev->stats.rx_frame_errors++;
878                                 bad = 1;
879                         } else if (status & GRETH_RXBD_ERR_CRC) {
880                                 dev->stats.rx_crc_errors++;
881                                 bad = 1;
882                         }
883                 }
884
885                 /* Allocate new skb to replace current, not needed if the
886                  * current skb can be reused */
887                 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
888                         skb_reserve(newskb, NET_IP_ALIGN);
889
890                         dma_addr = dma_map_single(greth->dev,
891                                                       newskb->data,
892                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
893                                                       DMA_FROM_DEVICE);
894
895                         if (!dma_mapping_error(greth->dev, dma_addr)) {
896                                 /* Process the incoming frame. */
897                                 pkt_len = status & GRETH_BD_LEN;
898
899                                 dma_unmap_single(greth->dev,
900                                                  greth_read_bd(&bdp->addr),
901                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
902                                                  DMA_FROM_DEVICE);
903
904                                 if (netif_msg_pktdata(greth))
905                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
906
907                                 skb_put(skb, pkt_len);
908
909                                 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
910                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
911                                 else
912                                         skb_checksum_none_assert(skb);
913
914                                 skb->protocol = eth_type_trans(skb, dev);
915                                 dev->stats.rx_packets++;
916                                 dev->stats.rx_bytes += pkt_len;
917                                 netif_receive_skb(skb);
918
919                                 greth->rx_skbuff[greth->rx_cur] = newskb;
920                                 greth_write_bd(&bdp->addr, dma_addr);
921                         } else {
922                                 if (net_ratelimit())
923                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
924                                 dev_kfree_skb(newskb);
925                                 /* reusing current skb, so it is a drop */
926                                 dev->stats.rx_dropped++;
927                         }
928                 } else if (bad) {
929                         /* Bad Frame transfer, the skb is reused */
930                         dev->stats.rx_dropped++;
931                 } else {
932                         /* Failed Allocating a new skb. This is rather stupid
933                          * but the current "filled" skb is reused, as if
934                          * transfer failure. One could argue that RX descriptor
935                          * table handling should be divided into cleaning and
936                          * filling as the TX part of the driver
937                          */
938                         if (net_ratelimit())
939                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
940                         /* reusing current skb, so it is a drop */
941                         dev->stats.rx_dropped++;
942                 }
943
944                 status = GRETH_BD_EN | GRETH_BD_IE;
945                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
946                         status |= GRETH_BD_WR;
947                 }
948
949                 wmb();
950                 greth_write_bd(&bdp->stat, status);
951                 spin_lock_irqsave(&greth->devlock, flags);
952                 greth_enable_rx(greth);
953                 spin_unlock_irqrestore(&greth->devlock, flags);
954                 greth->rx_cur = NEXT_RX(greth->rx_cur);
955         }
956
957         return count;
958
959 }
960
961 static int greth_poll(struct napi_struct *napi, int budget)
962 {
963         struct greth_private *greth;
964         int work_done = 0;
965         unsigned long flags;
966         u32 mask, ctrl;
967         greth = container_of(napi, struct greth_private, napi);
968
969 restart_txrx_poll:
970         if (netif_queue_stopped(greth->netdev)) {
971                 if (greth->gbit_mac)
972                         greth_clean_tx_gbit(greth->netdev);
973                 else
974                         greth_clean_tx(greth->netdev);
975         }
976
977         if (greth->gbit_mac) {
978                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
979         } else {
980                 work_done += greth_rx(greth->netdev, budget - work_done);
981         }
982
983         if (work_done < budget) {
984
985                 spin_lock_irqsave(&greth->devlock, flags);
986
987                 ctrl = GRETH_REGLOAD(greth->regs->control);
988                 if (netif_queue_stopped(greth->netdev)) {
989                         GRETH_REGSAVE(greth->regs->control,
990                                         ctrl | GRETH_TXI | GRETH_RXI);
991                         mask = GRETH_INT_RX | GRETH_INT_RE |
992                                GRETH_INT_TX | GRETH_INT_TE;
993                 } else {
994                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
995                         mask = GRETH_INT_RX | GRETH_INT_RE;
996                 }
997
998                 if (GRETH_REGLOAD(greth->regs->status) & mask) {
999                         GRETH_REGSAVE(greth->regs->control, ctrl);
1000                         spin_unlock_irqrestore(&greth->devlock, flags);
1001                         goto restart_txrx_poll;
1002                 } else {
1003                         __napi_complete(napi);
1004                         spin_unlock_irqrestore(&greth->devlock, flags);
1005                 }
1006         }
1007
1008         return work_done;
1009 }
1010
1011 static int greth_set_mac_add(struct net_device *dev, void *p)
1012 {
1013         struct sockaddr *addr = p;
1014         struct greth_private *greth;
1015         struct greth_regs *regs;
1016
1017         greth = netdev_priv(dev);
1018         regs = (struct greth_regs *) greth->regs;
1019
1020         if (!is_valid_ether_addr(addr->sa_data))
1021                 return -EINVAL;
1022
1023         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1024         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1025         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1026                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1027
1028         return 0;
1029 }
1030
1031 static u32 greth_hash_get_index(__u8 *addr)
1032 {
1033         return (ether_crc(6, addr)) & 0x3F;
1034 }
1035
1036 static void greth_set_hash_filter(struct net_device *dev)
1037 {
1038         struct netdev_hw_addr *ha;
1039         struct greth_private *greth = netdev_priv(dev);
1040         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1041         u32 mc_filter[2];
1042         unsigned int bitnr;
1043
1044         mc_filter[0] = mc_filter[1] = 0;
1045
1046         netdev_for_each_mc_addr(ha, dev) {
1047                 bitnr = greth_hash_get_index(ha->addr);
1048                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1049         }
1050
1051         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1052         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1053 }
1054
1055 static void greth_set_multicast_list(struct net_device *dev)
1056 {
1057         int cfg;
1058         struct greth_private *greth = netdev_priv(dev);
1059         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1060
1061         cfg = GRETH_REGLOAD(regs->control);
1062         if (dev->flags & IFF_PROMISC)
1063                 cfg |= GRETH_CTRL_PR;
1064         else
1065                 cfg &= ~GRETH_CTRL_PR;
1066
1067         if (greth->multicast) {
1068                 if (dev->flags & IFF_ALLMULTI) {
1069                         GRETH_REGSAVE(regs->hash_msb, -1);
1070                         GRETH_REGSAVE(regs->hash_lsb, -1);
1071                         cfg |= GRETH_CTRL_MCEN;
1072                         GRETH_REGSAVE(regs->control, cfg);
1073                         return;
1074                 }
1075
1076                 if (netdev_mc_empty(dev)) {
1077                         cfg &= ~GRETH_CTRL_MCEN;
1078                         GRETH_REGSAVE(regs->control, cfg);
1079                         return;
1080                 }
1081
1082                 /* Setup multicast filter */
1083                 greth_set_hash_filter(dev);
1084                 cfg |= GRETH_CTRL_MCEN;
1085         }
1086         GRETH_REGSAVE(regs->control, cfg);
1087 }
1088
1089 static u32 greth_get_msglevel(struct net_device *dev)
1090 {
1091         struct greth_private *greth = netdev_priv(dev);
1092         return greth->msg_enable;
1093 }
1094
1095 static void greth_set_msglevel(struct net_device *dev, u32 value)
1096 {
1097         struct greth_private *greth = netdev_priv(dev);
1098         greth->msg_enable = value;
1099 }
1100 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1101 {
1102         struct greth_private *greth = netdev_priv(dev);
1103         struct phy_device *phy = greth->phy;
1104
1105         if (!phy)
1106                 return -ENODEV;
1107
1108         return phy_ethtool_gset(phy, cmd);
1109 }
1110
1111 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1112 {
1113         struct greth_private *greth = netdev_priv(dev);
1114         struct phy_device *phy = greth->phy;
1115
1116         if (!phy)
1117                 return -ENODEV;
1118
1119         return phy_ethtool_sset(phy, cmd);
1120 }
1121
1122 static int greth_get_regs_len(struct net_device *dev)
1123 {
1124         return sizeof(struct greth_regs);
1125 }
1126
1127 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1128 {
1129         struct greth_private *greth = netdev_priv(dev);
1130
1131         strncpy(info->driver, dev_driver_string(greth->dev), 32);
1132         strncpy(info->version, "revision: 1.0", 32);
1133         strncpy(info->bus_info, greth->dev->bus->name, 32);
1134         strncpy(info->fw_version, "N/A", 32);
1135         info->eedump_len = 0;
1136         info->regdump_len = sizeof(struct greth_regs);
1137 }
1138
1139 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1140 {
1141         int i;
1142         struct greth_private *greth = netdev_priv(dev);
1143         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1144         u32 *buff = p;
1145
1146         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1147                 buff[i] = greth_read_bd(&greth_regs[i]);
1148 }
1149
1150 static const struct ethtool_ops greth_ethtool_ops = {
1151         .get_msglevel           = greth_get_msglevel,
1152         .set_msglevel           = greth_set_msglevel,
1153         .get_settings           = greth_get_settings,
1154         .set_settings           = greth_set_settings,
1155         .get_drvinfo            = greth_get_drvinfo,
1156         .get_regs_len           = greth_get_regs_len,
1157         .get_regs               = greth_get_regs,
1158         .get_link               = ethtool_op_get_link,
1159 };
1160
1161 static struct net_device_ops greth_netdev_ops = {
1162         .ndo_open               = greth_open,
1163         .ndo_stop               = greth_close,
1164         .ndo_start_xmit         = greth_start_xmit,
1165         .ndo_set_mac_address    = greth_set_mac_add,
1166         .ndo_validate_addr      = eth_validate_addr,
1167 };
1168
1169 static inline int wait_for_mdio(struct greth_private *greth)
1170 {
1171         unsigned long timeout = jiffies + 4*HZ/100;
1172         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1173                 if (time_after(jiffies, timeout))
1174                         return 0;
1175         }
1176         return 1;
1177 }
1178
1179 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1180 {
1181         struct greth_private *greth = bus->priv;
1182         int data;
1183
1184         if (!wait_for_mdio(greth))
1185                 return -EBUSY;
1186
1187         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1188
1189         if (!wait_for_mdio(greth))
1190                 return -EBUSY;
1191
1192         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1193                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1194                 return data;
1195
1196         } else {
1197                 return -1;
1198         }
1199 }
1200
1201 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1202 {
1203         struct greth_private *greth = bus->priv;
1204
1205         if (!wait_for_mdio(greth))
1206                 return -EBUSY;
1207
1208         GRETH_REGSAVE(greth->regs->mdio,
1209                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1210
1211         if (!wait_for_mdio(greth))
1212                 return -EBUSY;
1213
1214         return 0;
1215 }
1216
1217 static int greth_mdio_reset(struct mii_bus *bus)
1218 {
1219         return 0;
1220 }
1221
1222 static void greth_link_change(struct net_device *dev)
1223 {
1224         struct greth_private *greth = netdev_priv(dev);
1225         struct phy_device *phydev = greth->phy;
1226         unsigned long flags;
1227         int status_change = 0;
1228         u32 ctrl;
1229
1230         spin_lock_irqsave(&greth->devlock, flags);
1231
1232         if (phydev->link) {
1233
1234                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1235                         ctrl = GRETH_REGLOAD(greth->regs->control) &
1236                                ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1237
1238                         if (phydev->duplex)
1239                                 ctrl |= GRETH_CTRL_FD;
1240
1241                         if (phydev->speed == SPEED_100)
1242                                 ctrl |= GRETH_CTRL_SP;
1243                         else if (phydev->speed == SPEED_1000)
1244                                 ctrl |= GRETH_CTRL_GB;
1245
1246                         GRETH_REGSAVE(greth->regs->control, ctrl);
1247                         greth->speed = phydev->speed;
1248                         greth->duplex = phydev->duplex;
1249                         status_change = 1;
1250                 }
1251         }
1252
1253         if (phydev->link != greth->link) {
1254                 if (!phydev->link) {
1255                         greth->speed = 0;
1256                         greth->duplex = -1;
1257                 }
1258                 greth->link = phydev->link;
1259
1260                 status_change = 1;
1261         }
1262
1263         spin_unlock_irqrestore(&greth->devlock, flags);
1264
1265         if (status_change) {
1266                 if (phydev->link)
1267                         pr_debug("%s: link up (%d/%s)\n",
1268                                 dev->name, phydev->speed,
1269                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1270                 else
1271                         pr_debug("%s: link down\n", dev->name);
1272         }
1273 }
1274
1275 static int greth_mdio_probe(struct net_device *dev)
1276 {
1277         struct greth_private *greth = netdev_priv(dev);
1278         struct phy_device *phy = NULL;
1279         int ret;
1280
1281         /* Find the first PHY */
1282         phy = phy_find_first(greth->mdio);
1283
1284         if (!phy) {
1285                 if (netif_msg_probe(greth))
1286                         dev_err(&dev->dev, "no PHY found\n");
1287                 return -ENXIO;
1288         }
1289
1290         ret = phy_connect_direct(dev, phy, &greth_link_change,
1291                         0, greth->gbit_mac ?
1292                         PHY_INTERFACE_MODE_GMII :
1293                         PHY_INTERFACE_MODE_MII);
1294         if (ret) {
1295                 if (netif_msg_ifup(greth))
1296                         dev_err(&dev->dev, "could not attach to PHY\n");
1297                 return ret;
1298         }
1299
1300         if (greth->gbit_mac)
1301                 phy->supported &= PHY_GBIT_FEATURES;
1302         else
1303                 phy->supported &= PHY_BASIC_FEATURES;
1304
1305         phy->advertising = phy->supported;
1306
1307         greth->link = 0;
1308         greth->speed = 0;
1309         greth->duplex = -1;
1310         greth->phy = phy;
1311
1312         return 0;
1313 }
1314
1315 static inline int phy_aneg_done(struct phy_device *phydev)
1316 {
1317         int retval;
1318
1319         retval = phy_read(phydev, MII_BMSR);
1320
1321         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1322 }
1323
1324 static int greth_mdio_init(struct greth_private *greth)
1325 {
1326         int ret, phy;
1327         unsigned long timeout;
1328
1329         greth->mdio = mdiobus_alloc();
1330         if (!greth->mdio) {
1331                 return -ENOMEM;
1332         }
1333
1334         greth->mdio->name = "greth-mdio";
1335         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1336         greth->mdio->read = greth_mdio_read;
1337         greth->mdio->write = greth_mdio_write;
1338         greth->mdio->reset = greth_mdio_reset;
1339         greth->mdio->priv = greth;
1340
1341         greth->mdio->irq = greth->mdio_irqs;
1342
1343         for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1344                 greth->mdio->irq[phy] = PHY_POLL;
1345
1346         ret = mdiobus_register(greth->mdio);
1347         if (ret) {
1348                 goto error;
1349         }
1350
1351         ret = greth_mdio_probe(greth->netdev);
1352         if (ret) {
1353                 if (netif_msg_probe(greth))
1354                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1355                 goto unreg_mdio;
1356         }
1357
1358         phy_start(greth->phy);
1359
1360         /* If Ethernet debug link is used make autoneg happen right away */
1361         if (greth->edcl && greth_edcl == 1) {
1362                 phy_start_aneg(greth->phy);
1363                 timeout = jiffies + 6*HZ;
1364                 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1365                 }
1366                 genphy_read_status(greth->phy);
1367                 greth_link_change(greth->netdev);
1368         }
1369
1370         return 0;
1371
1372 unreg_mdio:
1373         mdiobus_unregister(greth->mdio);
1374 error:
1375         mdiobus_free(greth->mdio);
1376         return ret;
1377 }
1378
1379 /* Initialize the GRETH MAC */
1380 static int __devinit greth_of_probe(struct platform_device *ofdev)
1381 {
1382         struct net_device *dev;
1383         struct greth_private *greth;
1384         struct greth_regs *regs;
1385
1386         int i;
1387         int err;
1388         int tmp;
1389         unsigned long timeout;
1390
1391         dev = alloc_etherdev(sizeof(struct greth_private));
1392
1393         if (dev == NULL)
1394                 return -ENOMEM;
1395
1396         greth = netdev_priv(dev);
1397         greth->netdev = dev;
1398         greth->dev = &ofdev->dev;
1399
1400         if (greth_debug > 0)
1401                 greth->msg_enable = greth_debug;
1402         else
1403                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1404
1405         spin_lock_init(&greth->devlock);
1406
1407         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1408                                  resource_size(&ofdev->resource[0]),
1409                                  "grlib-greth regs");
1410
1411         if (greth->regs == NULL) {
1412                 if (netif_msg_probe(greth))
1413                         dev_err(greth->dev, "ioremap failure.\n");
1414                 err = -EIO;
1415                 goto error1;
1416         }
1417
1418         regs = (struct greth_regs *) greth->regs;
1419         greth->irq = ofdev->archdata.irqs[0];
1420
1421         dev_set_drvdata(greth->dev, dev);
1422         SET_NETDEV_DEV(dev, greth->dev);
1423
1424         if (netif_msg_probe(greth))
1425                 dev_dbg(greth->dev, "reseting controller.\n");
1426
1427         /* Reset the controller. */
1428         GRETH_REGSAVE(regs->control, GRETH_RESET);
1429
1430         /* Wait for MAC to reset itself */
1431         timeout = jiffies + HZ/100;
1432         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1433                 if (time_after(jiffies, timeout)) {
1434                         err = -EIO;
1435                         if (netif_msg_probe(greth))
1436                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1437                         goto error2;
1438                 }
1439         }
1440
1441         /* Get default PHY address  */
1442         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1443
1444         /* Check if we have GBIT capable MAC */
1445         tmp = GRETH_REGLOAD(regs->control);
1446         greth->gbit_mac = (tmp >> 27) & 1;
1447
1448         /* Check for multicast capability */
1449         greth->multicast = (tmp >> 25) & 1;
1450
1451         greth->edcl = (tmp >> 31) & 1;
1452
1453         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1454          * it doesn't interfere with the software */
1455         if (greth->edcl != 0)
1456                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1457
1458         /* Check if MAC can handle MDIO interrupts */
1459         greth->mdio_int_en = (tmp >> 26) & 1;
1460
1461         err = greth_mdio_init(greth);
1462         if (err) {
1463                 if (netif_msg_probe(greth))
1464                         dev_err(greth->dev, "failed to register MDIO bus\n");
1465                 goto error2;
1466         }
1467
1468         /* Allocate TX descriptor ring in coherent memory */
1469         greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1470                                                                    1024,
1471                                                                    &greth->tx_bd_base_phys,
1472                                                                    GFP_KERNEL);
1473
1474         if (!greth->tx_bd_base) {
1475                 if (netif_msg_probe(greth))
1476                         dev_err(&dev->dev, "could not allocate descriptor memory.\n");
1477                 err = -ENOMEM;
1478                 goto error3;
1479         }
1480
1481         memset(greth->tx_bd_base, 0, 1024);
1482
1483         /* Allocate RX descriptor ring in coherent memory */
1484         greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1485                                                                    1024,
1486                                                                    &greth->rx_bd_base_phys,
1487                                                                    GFP_KERNEL);
1488
1489         if (!greth->rx_bd_base) {
1490                 if (netif_msg_probe(greth))
1491                         dev_err(greth->dev, "could not allocate descriptor memory.\n");
1492                 err = -ENOMEM;
1493                 goto error4;
1494         }
1495
1496         memset(greth->rx_bd_base, 0, 1024);
1497
1498         /* Get MAC address from: module param, OF property or ID prom */
1499         for (i = 0; i < 6; i++) {
1500                 if (macaddr[i] != 0)
1501                         break;
1502         }
1503         if (i == 6) {
1504                 const unsigned char *addr;
1505                 int len;
1506                 addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1507                                         &len);
1508                 if (addr != NULL && len == 6) {
1509                         for (i = 0; i < 6; i++)
1510                                 macaddr[i] = (unsigned int) addr[i];
1511                 } else {
1512 #ifdef CONFIG_SPARC
1513                         for (i = 0; i < 6; i++)
1514                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1515 #endif
1516                 }
1517         }
1518
1519         for (i = 0; i < 6; i++)
1520                 dev->dev_addr[i] = macaddr[i];
1521
1522         macaddr[5]++;
1523
1524         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1525                 if (netif_msg_probe(greth))
1526                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1527                 err = -EINVAL;
1528                 goto error5;
1529         }
1530
1531         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1532         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1533                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1534
1535         /* Clear all pending interrupts except PHY irq */
1536         GRETH_REGSAVE(regs->status, 0xFF);
1537
1538         if (greth->gbit_mac) {
1539                 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1540                         NETIF_F_RXCSUM;
1541                 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1542                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1543         }
1544
1545         if (greth->multicast) {
1546                 greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list;
1547                 dev->flags |= IFF_MULTICAST;
1548         } else {
1549                 dev->flags &= ~IFF_MULTICAST;
1550         }
1551
1552         dev->netdev_ops = &greth_netdev_ops;
1553         dev->ethtool_ops = &greth_ethtool_ops;
1554
1555         err = register_netdev(dev);
1556         if (err) {
1557                 if (netif_msg_probe(greth))
1558                         dev_err(greth->dev, "netdevice registration failed.\n");
1559                 goto error5;
1560         }
1561
1562         /* setup NAPI */
1563         netif_napi_add(dev, &greth->napi, greth_poll, 64);
1564
1565         return 0;
1566
1567 error5:
1568         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1569 error4:
1570         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1571 error3:
1572         mdiobus_unregister(greth->mdio);
1573 error2:
1574         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1575 error1:
1576         free_netdev(dev);
1577         return err;
1578 }
1579
1580 static int __devexit greth_of_remove(struct platform_device *of_dev)
1581 {
1582         struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
1583         struct greth_private *greth = netdev_priv(ndev);
1584
1585         /* Free descriptor areas */
1586         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1587
1588         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1589
1590         dev_set_drvdata(&of_dev->dev, NULL);
1591
1592         if (greth->phy)
1593                 phy_stop(greth->phy);
1594         mdiobus_unregister(greth->mdio);
1595
1596         unregister_netdev(ndev);
1597         free_netdev(ndev);
1598
1599         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1600
1601         return 0;
1602 }
1603
1604 static struct of_device_id greth_of_match[] = {
1605         {
1606          .name = "GAISLER_ETHMAC",
1607          },
1608         {
1609          .name = "01_01d",
1610          },
1611         {},
1612 };
1613
1614 MODULE_DEVICE_TABLE(of, greth_of_match);
1615
1616 static struct platform_driver greth_of_driver = {
1617         .driver = {
1618                 .name = "grlib-greth",
1619                 .owner = THIS_MODULE,
1620                 .of_match_table = greth_of_match,
1621         },
1622         .probe = greth_of_probe,
1623         .remove = __devexit_p(greth_of_remove),
1624 };
1625
1626 static int __init greth_init(void)
1627 {
1628         return platform_driver_register(&greth_of_driver);
1629 }
1630
1631 static void __exit greth_cleanup(void)
1632 {
1633         platform_driver_unregister(&greth_of_driver);
1634 }
1635
1636 module_init(greth_init);
1637 module_exit(greth_cleanup);
1638
1639 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1640 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1641 MODULE_LICENSE("GPL");