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WIP FPC-III support
[linux/fpc-iii.git] / drivers / net / ethernet / aeroflex / greth.c
blob9c5891bbfe61afbd798efcad906e632b07ca38a3
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
4 *
5 * 2005-2010 (c) Aeroflex Gaisler AB
6 *
7 * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
8 * available in the GRLIB VHDL IP core library.
9 *
10 * Full documentation of both cores can be found here:
11 * https://www.gaisler.com/products/grlib/grip.pdf
12 *
13 * The Gigabit version supports scatter/gather DMA, any alignment of
14 * buffers and checksum offloading.
15 *
16 * Contributors: Kristoffer Glembo
17 * Daniel Hellstrom
18 * Marko Isomaki
19 */
20
21 #include <linux/dma-mapping.h>
22 #include <linux/module.h>
23 #include <linux/uaccess.h>
24 #include <linux/interrupt.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/ethtool.h>
28 #include <linux/skbuff.h>
29 #include <linux/io.h>
30 #include <linux/crc32.h>
31 #include <linux/mii.h>
32 #include <linux/of_device.h>
33 #include <linux/of_net.h>
34 #include <linux/of_platform.h>
35 #include <linux/slab.h>
36 #include <asm/cacheflush.h>
37 #include <asm/byteorder.h>
38
39 #ifdef CONFIG_SPARC
40 #include <asm/idprom.h>
41 #endif
42
43 #include "greth.h"
44
45 #define GRETH_DEF_MSG_ENABLE \
46 (NETIF_MSG_DRV | \
47 NETIF_MSG_PROBE | \
48 NETIF_MSG_LINK | \
49 NETIF_MSG_IFDOWN | \
50 NETIF_MSG_IFUP | \
51 NETIF_MSG_RX_ERR | \
52 NETIF_MSG_TX_ERR)
53
54 static int greth_debug = -1; /* -1 == use GRETH_DEF_MSG_ENABLE as value */
55 module_param(greth_debug, int, 0);
56 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
57
58 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
59 static int macaddr[6];
60 module_param_array(macaddr, int, NULL, 0);
61 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
62
63 static int greth_edcl = 1;
64 module_param(greth_edcl, int, 0);
65 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
66
67 static int greth_open(struct net_device *dev);
68 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
69 struct net_device *dev);
70 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
71 struct net_device *dev);
72 static int greth_rx(struct net_device *dev, int limit);
73 static int greth_rx_gbit(struct net_device *dev, int limit);
74 static void greth_clean_tx(struct net_device *dev);
75 static void greth_clean_tx_gbit(struct net_device *dev);
76 static irqreturn_t greth_interrupt(int irq, void *dev_id);
77 static int greth_close(struct net_device *dev);
78 static int greth_set_mac_add(struct net_device *dev, void *p);
79 static void greth_set_multicast_list(struct net_device *dev);
80
81 #define GRETH_REGLOAD(a) (be32_to_cpu(__raw_readl(&(a))))
82 #define GRETH_REGSAVE(a, v) (__raw_writel(cpu_to_be32(v), &(a)))
83 #define GRETH_REGORIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
84 #define GRETH_REGANDIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
85
86 #define NEXT_TX(N) (((N) + 1) & GRETH_TXBD_NUM_MASK)
87 #define SKIP_TX(N, C) (((N) + C) & GRETH_TXBD_NUM_MASK)
88 #define NEXT_RX(N) (((N) + 1) & GRETH_RXBD_NUM_MASK)
89
90 static void greth_print_rx_packet(void *addr, int len)
91 {
92 print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
93 addr, len, true);
94 }
95
96 static void greth_print_tx_packet(struct sk_buff *skb)
97 {
98 int i;
99 int length;
100
101 if (skb_shinfo(skb)->nr_frags == 0)
102 length = skb->len;
103 else
104 length = skb_headlen(skb);
105
106 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
107 skb->data, length, true);
108
109 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
110
111 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
112 skb_frag_address(&skb_shinfo(skb)->frags[i]),
113 skb_frag_size(&skb_shinfo(skb)->frags[i]), true);
114 }
115 }
116
117 static inline void greth_enable_tx(struct greth_private *greth)
118 {
119 wmb();
120 GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
121 }
122
123 static inline void greth_enable_tx_and_irq(struct greth_private *greth)
124 {
125 wmb(); /* BDs must been written to memory before enabling TX */
126 GRETH_REGORIN(greth->regs->control, GRETH_TXEN | GRETH_TXI);
127 }
128
129 static inline void greth_disable_tx(struct greth_private *greth)
130 {
131 GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
132 }
133
134 static inline void greth_enable_rx(struct greth_private *greth)
135 {
136 wmb();
137 GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
138 }
139
140 static inline void greth_disable_rx(struct greth_private *greth)
141 {
142 GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
143 }
144
145 static inline void greth_enable_irqs(struct greth_private *greth)
146 {
147 GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
148 }
149
150 static inline void greth_disable_irqs(struct greth_private *greth)
151 {
152 GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
153 }
154
155 static inline void greth_write_bd(u32 *bd, u32 val)
156 {
157 __raw_writel(cpu_to_be32(val), bd);
158 }
159
160 static inline u32 greth_read_bd(u32 *bd)
161 {
162 return be32_to_cpu(__raw_readl(bd));
163 }
164
165 static void greth_clean_rings(struct greth_private *greth)
166 {
167 int i;
168 struct greth_bd *rx_bdp = greth->rx_bd_base;
169 struct greth_bd *tx_bdp = greth->tx_bd_base;
170
171 if (greth->gbit_mac) {
172
173 /* Free and unmap RX buffers */
174 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
175 if (greth->rx_skbuff[i] != NULL) {
176 dev_kfree_skb(greth->rx_skbuff[i]);
177 dma_unmap_single(greth->dev,
178 greth_read_bd(&rx_bdp->addr),
179 MAX_FRAME_SIZE+NET_IP_ALIGN,
180 DMA_FROM_DEVICE);
181 }
182 }
183
184 /* TX buffers */
185 while (greth->tx_free < GRETH_TXBD_NUM) {
186
187 struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
188 int nr_frags = skb_shinfo(skb)->nr_frags;
189 tx_bdp = greth->tx_bd_base + greth->tx_last;
190 greth->tx_last = NEXT_TX(greth->tx_last);
191
192 dma_unmap_single(greth->dev,
193 greth_read_bd(&tx_bdp->addr),
194 skb_headlen(skb),
195 DMA_TO_DEVICE);
196
197 for (i = 0; i < nr_frags; i++) {
198 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
199 tx_bdp = greth->tx_bd_base + greth->tx_last;
200
201 dma_unmap_page(greth->dev,
202 greth_read_bd(&tx_bdp->addr),
203 skb_frag_size(frag),
204 DMA_TO_DEVICE);
205
206 greth->tx_last = NEXT_TX(greth->tx_last);
207 }
208 greth->tx_free += nr_frags+1;
209 dev_kfree_skb(skb);
210 }
211
212
213 } else { /* 10/100 Mbps MAC */
214
215 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
216 kfree(greth->rx_bufs[i]);
217 dma_unmap_single(greth->dev,
218 greth_read_bd(&rx_bdp->addr),
219 MAX_FRAME_SIZE,
220 DMA_FROM_DEVICE);
221 }
222 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
223 kfree(greth->tx_bufs[i]);
224 dma_unmap_single(greth->dev,
225 greth_read_bd(&tx_bdp->addr),
226 MAX_FRAME_SIZE,
227 DMA_TO_DEVICE);
228 }
229 }
230 }
231
232 static int greth_init_rings(struct greth_private *greth)
233 {
234 struct sk_buff *skb;
235 struct greth_bd *rx_bd, *tx_bd;
236 u32 dma_addr;
237 int i;
238
239 rx_bd = greth->rx_bd_base;
240 tx_bd = greth->tx_bd_base;
241
242 /* Initialize descriptor rings and buffers */
243 if (greth->gbit_mac) {
244
245 for (i = 0; i < GRETH_RXBD_NUM; i++) {
246 skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
247 if (skb == NULL) {
248 if (netif_msg_ifup(greth))
249 dev_err(greth->dev, "Error allocating DMA ring.\n");
250 goto cleanup;
251 }
252 skb_reserve(skb, NET_IP_ALIGN);
253 dma_addr = dma_map_single(greth->dev,
254 skb->data,
255 MAX_FRAME_SIZE+NET_IP_ALIGN,
256 DMA_FROM_DEVICE);
257
258 if (dma_mapping_error(greth->dev, dma_addr)) {
259 if (netif_msg_ifup(greth))
260 dev_err(greth->dev, "Could not create initial DMA mapping\n");
261 goto cleanup;
262 }
263 greth->rx_skbuff[i] = skb;
264 greth_write_bd(&rx_bd[i].addr, dma_addr);
265 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
266 }
267
268 } else {
269
270 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
271 for (i = 0; i < GRETH_RXBD_NUM; i++) {
272
273 greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
274
275 if (greth->rx_bufs[i] == NULL) {
276 if (netif_msg_ifup(greth))
277 dev_err(greth->dev, "Error allocating DMA ring.\n");
278 goto cleanup;
279 }
280
281 dma_addr = dma_map_single(greth->dev,
282 greth->rx_bufs[i],
283 MAX_FRAME_SIZE,
284 DMA_FROM_DEVICE);
285
286 if (dma_mapping_error(greth->dev, dma_addr)) {
287 if (netif_msg_ifup(greth))
288 dev_err(greth->dev, "Could not create initial DMA mapping\n");
289 goto cleanup;
290 }
291 greth_write_bd(&rx_bd[i].addr, dma_addr);
292 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
293 }
294 for (i = 0; i < GRETH_TXBD_NUM; i++) {
295
296 greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
297
298 if (greth->tx_bufs[i] == NULL) {
299 if (netif_msg_ifup(greth))
300 dev_err(greth->dev, "Error allocating DMA ring.\n");
301 goto cleanup;
302 }
303
304 dma_addr = dma_map_single(greth->dev,
305 greth->tx_bufs[i],
306 MAX_FRAME_SIZE,
307 DMA_TO_DEVICE);
308
309 if (dma_mapping_error(greth->dev, dma_addr)) {
310 if (netif_msg_ifup(greth))
311 dev_err(greth->dev, "Could not create initial DMA mapping\n");
312 goto cleanup;
313 }
314 greth_write_bd(&tx_bd[i].addr, dma_addr);
315 greth_write_bd(&tx_bd[i].stat, 0);
316 }
317 }
318 greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
319 greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
320
321 /* Initialize pointers. */
322 greth->rx_cur = 0;
323 greth->tx_next = 0;
324 greth->tx_last = 0;
325 greth->tx_free = GRETH_TXBD_NUM;
326
327 /* Initialize descriptor base address */
328 GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
329 GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
330
331 return 0;
332
333 cleanup:
334 greth_clean_rings(greth);
335 return -ENOMEM;
336 }
337
338 static int greth_open(struct net_device *dev)
339 {
340 struct greth_private *greth = netdev_priv(dev);
341 int err;
342
343 err = greth_init_rings(greth);
344 if (err) {
345 if (netif_msg_ifup(greth))
346 dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
347 return err;
348 }
349
350 err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
351 if (err) {
352 if (netif_msg_ifup(greth))
353 dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
354 greth_clean_rings(greth);
355 return err;
356 }
357
358 if (netif_msg_ifup(greth))
359 dev_dbg(&dev->dev, " starting queue\n");
360 netif_start_queue(dev);
361
362 GRETH_REGSAVE(greth->regs->status, 0xFF);
363
364 napi_enable(&greth->napi);
365
366 greth_enable_irqs(greth);
367 greth_enable_tx(greth);
368 greth_enable_rx(greth);
369 return 0;
370
371 }
372
373 static int greth_close(struct net_device *dev)
374 {
375 struct greth_private *greth = netdev_priv(dev);
376
377 napi_disable(&greth->napi);
378
379 greth_disable_irqs(greth);
380 greth_disable_tx(greth);
381 greth_disable_rx(greth);
382
383 netif_stop_queue(dev);
384
385 free_irq(greth->irq, (void *) dev);
386
387 greth_clean_rings(greth);
388
389 return 0;
390 }
391
392 static netdev_tx_t
393 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
394 {
395 struct greth_private *greth = netdev_priv(dev);
396 struct greth_bd *bdp;
397 int err = NETDEV_TX_OK;
398 u32 status, dma_addr, ctrl;
399 unsigned long flags;
400
401 /* Clean TX Ring */
402 greth_clean_tx(greth->netdev);
403
404 if (unlikely(greth->tx_free <= 0)) {
405 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
406 ctrl = GRETH_REGLOAD(greth->regs->control);
407 /* Enable TX IRQ only if not already in poll() routine */
408 if (ctrl & GRETH_RXI)
409 GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
410 netif_stop_queue(dev);
411 spin_unlock_irqrestore(&greth->devlock, flags);
412 return NETDEV_TX_BUSY;
413 }
414
415 if (netif_msg_pktdata(greth))
416 greth_print_tx_packet(skb);
417
418
419 if (unlikely(skb->len > MAX_FRAME_SIZE)) {
420 dev->stats.tx_errors++;
421 goto out;
422 }
423
424 bdp = greth->tx_bd_base + greth->tx_next;
425 dma_addr = greth_read_bd(&bdp->addr);
426
427 memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
428
429 dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
430
431 status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
432 greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;
433
434 /* Wrap around descriptor ring */
435 if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
436 status |= GRETH_BD_WR;
437 }
438
439 greth->tx_next = NEXT_TX(greth->tx_next);
440 greth->tx_free--;
441
442 /* Write descriptor control word and enable transmission */
443 greth_write_bd(&bdp->stat, status);
444 spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
445 greth_enable_tx(greth);
446 spin_unlock_irqrestore(&greth->devlock, flags);
447
448 out:
449 dev_kfree_skb(skb);
450 return err;
451 }
452
453 static inline u16 greth_num_free_bds(u16 tx_last, u16 tx_next)
454 {
455 if (tx_next < tx_last)
456 return (tx_last - tx_next) - 1;
457 else
458 return GRETH_TXBD_NUM - (tx_next - tx_last) - 1;
459 }
460
461 static netdev_tx_t
462 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
463 {
464 struct greth_private *greth = netdev_priv(dev);
465 struct greth_bd *bdp;
466 u32 status, dma_addr;
467 int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
468 unsigned long flags;
469 u16 tx_last;
470
471 nr_frags = skb_shinfo(skb)->nr_frags;
472 tx_last = greth->tx_last;
473 rmb(); /* tx_last is updated by the poll task */
474
475 if (greth_num_free_bds(tx_last, greth->tx_next) < nr_frags + 1) {
476 netif_stop_queue(dev);
477 err = NETDEV_TX_BUSY;
478 goto out;
479 }
480
481 if (netif_msg_pktdata(greth))
482 greth_print_tx_packet(skb);
483
484 if (unlikely(skb->len > MAX_FRAME_SIZE)) {
485 dev->stats.tx_errors++;
486 goto out;
487 }
488
489 /* Save skb pointer. */
490 greth->tx_skbuff[greth->tx_next] = skb;
491
492 /* Linear buf */
493 if (nr_frags != 0)
494 status = GRETH_TXBD_MORE;
495 else
496 status = GRETH_BD_IE;
497
498 if (skb->ip_summed == CHECKSUM_PARTIAL)
499 status |= GRETH_TXBD_CSALL;
500 status |= skb_headlen(skb) & GRETH_BD_LEN;
501 if (greth->tx_next == GRETH_TXBD_NUM_MASK)
502 status |= GRETH_BD_WR;
503
504
505 bdp = greth->tx_bd_base + greth->tx_next;
506 greth_write_bd(&bdp->stat, status);
507 dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
508
509 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
510 goto map_error;
511
512 greth_write_bd(&bdp->addr, dma_addr);
513
514 curr_tx = NEXT_TX(greth->tx_next);
515
516 /* Frags */
517 for (i = 0; i < nr_frags; i++) {
518 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
519 greth->tx_skbuff[curr_tx] = NULL;
520 bdp = greth->tx_bd_base + curr_tx;
521
522 status = GRETH_BD_EN;
523 if (skb->ip_summed == CHECKSUM_PARTIAL)
524 status |= GRETH_TXBD_CSALL;
525 status |= skb_frag_size(frag) & GRETH_BD_LEN;
526
527 /* Wrap around descriptor ring */
528 if (curr_tx == GRETH_TXBD_NUM_MASK)
529 status |= GRETH_BD_WR;
530
531 /* More fragments left */
532 if (i < nr_frags - 1)
533 status |= GRETH_TXBD_MORE;
534 else
535 status |= GRETH_BD_IE; /* enable IRQ on last fragment */
536
537 greth_write_bd(&bdp->stat, status);
538
539 dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag),
540 DMA_TO_DEVICE);
541
542 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
543 goto frag_map_error;
544
545 greth_write_bd(&bdp->addr, dma_addr);
546
547 curr_tx = NEXT_TX(curr_tx);
548 }
549
550 wmb();
551
552 /* Enable the descriptor chain by enabling the first descriptor */
553 bdp = greth->tx_bd_base + greth->tx_next;
554 greth_write_bd(&bdp->stat,
555 greth_read_bd(&bdp->stat) | GRETH_BD_EN);
556
557 spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
558 greth->tx_next = curr_tx;
559 greth_enable_tx_and_irq(greth);
560 spin_unlock_irqrestore(&greth->devlock, flags);
561
562 return NETDEV_TX_OK;
563
564 frag_map_error:
565 /* Unmap SKB mappings that succeeded and disable descriptor */
566 for (i = 0; greth->tx_next + i != curr_tx; i++) {
567 bdp = greth->tx_bd_base + greth->tx_next + i;
568 dma_unmap_single(greth->dev,
569 greth_read_bd(&bdp->addr),
570 greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
571 DMA_TO_DEVICE);
572 greth_write_bd(&bdp->stat, 0);
573 }
574 map_error:
575 if (net_ratelimit())
576 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
577 dev_kfree_skb(skb);
578 out:
579 return err;
580 }
581
582 static irqreturn_t greth_interrupt(int irq, void *dev_id)
583 {
584 struct net_device *dev = dev_id;
585 struct greth_private *greth;
586 u32 status, ctrl;
587 irqreturn_t retval = IRQ_NONE;
588
589 greth = netdev_priv(dev);
590
591 spin_lock(&greth->devlock);
592
593 /* Get the interrupt events that caused us to be here. */
594 status = GRETH_REGLOAD(greth->regs->status);
595
596 /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
597 * set regardless of whether IRQ is enabled or not. Especially
598 * important when shared IRQ.
599 */
600 ctrl = GRETH_REGLOAD(greth->regs->control);
601
602 /* Handle rx and tx interrupts through poll */
603 if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
604 ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
605 retval = IRQ_HANDLED;
606
607 /* Disable interrupts and schedule poll() */
608 greth_disable_irqs(greth);
609 napi_schedule(&greth->napi);
610 }
611
612 spin_unlock(&greth->devlock);
613
614 return retval;
615 }
616
617 static void greth_clean_tx(struct net_device *dev)
618 {
619 struct greth_private *greth;
620 struct greth_bd *bdp;
621 u32 stat;
622
623 greth = netdev_priv(dev);
624
625 while (1) {
626 bdp = greth->tx_bd_base + greth->tx_last;
627 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
628 mb();
629 stat = greth_read_bd(&bdp->stat);
630
631 if (unlikely(stat & GRETH_BD_EN))
632 break;
633
634 if (greth->tx_free == GRETH_TXBD_NUM)
635 break;
636
637 /* Check status for errors */
638 if (unlikely(stat & GRETH_TXBD_STATUS)) {
639 dev->stats.tx_errors++;
640 if (stat & GRETH_TXBD_ERR_AL)
641 dev->stats.tx_aborted_errors++;
642 if (stat & GRETH_TXBD_ERR_UE)
643 dev->stats.tx_fifo_errors++;
644 }
645 dev->stats.tx_packets++;
646 dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
647 greth->tx_last = NEXT_TX(greth->tx_last);
648 greth->tx_free++;
649 }
650
651 if (greth->tx_free > 0) {
652 netif_wake_queue(dev);
653 }
654 }
655
656 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
657 {
658 /* Check status for errors */
659 if (unlikely(stat & GRETH_TXBD_STATUS)) {
660 dev->stats.tx_errors++;
661 if (stat & GRETH_TXBD_ERR_AL)
662 dev->stats.tx_aborted_errors++;
663 if (stat & GRETH_TXBD_ERR_UE)
664 dev->stats.tx_fifo_errors++;
665 if (stat & GRETH_TXBD_ERR_LC)
666 dev->stats.tx_aborted_errors++;
667 }
668 dev->stats.tx_packets++;
669 }
670
671 static void greth_clean_tx_gbit(struct net_device *dev)
672 {
673 struct greth_private *greth;
674 struct greth_bd *bdp, *bdp_last_frag;
675 struct sk_buff *skb = NULL;
676 u32 stat;
677 int nr_frags, i;
678 u16 tx_last;
679
680 greth = netdev_priv(dev);
681 tx_last = greth->tx_last;
682
683 while (tx_last != greth->tx_next) {
684
685 skb = greth->tx_skbuff[tx_last];
686
687 nr_frags = skb_shinfo(skb)->nr_frags;
688
689 /* We only clean fully completed SKBs */
690 bdp_last_frag = greth->tx_bd_base + SKIP_TX(tx_last, nr_frags);
691
692 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
693 mb();
694 stat = greth_read_bd(&bdp_last_frag->stat);
695
696 if (stat & GRETH_BD_EN)
697 break;
698
699 greth->tx_skbuff[tx_last] = NULL;
700
701 greth_update_tx_stats(dev, stat);
702 dev->stats.tx_bytes += skb->len;
703
704 bdp = greth->tx_bd_base + tx_last;
705
706 tx_last = NEXT_TX(tx_last);
707
708 dma_unmap_single(greth->dev,
709 greth_read_bd(&bdp->addr),
710 skb_headlen(skb),
711 DMA_TO_DEVICE);
712
713 for (i = 0; i < nr_frags; i++) {
714 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
715 bdp = greth->tx_bd_base + tx_last;
716
717 dma_unmap_page(greth->dev,
718 greth_read_bd(&bdp->addr),
719 skb_frag_size(frag),
720 DMA_TO_DEVICE);
721
722 tx_last = NEXT_TX(tx_last);
723 }
724 dev_kfree_skb(skb);
725 }
726 if (skb) { /* skb is set only if the above while loop was entered */
727 wmb();
728 greth->tx_last = tx_last;
729
730 if (netif_queue_stopped(dev) &&
731 (greth_num_free_bds(tx_last, greth->tx_next) >
732 (MAX_SKB_FRAGS+1)))
733 netif_wake_queue(dev);
734 }
735 }
736
737 static int greth_rx(struct net_device *dev, int limit)
738 {
739 struct greth_private *greth;
740 struct greth_bd *bdp;
741 struct sk_buff *skb;
742 int pkt_len;
743 int bad, count;
744 u32 status, dma_addr;
745 unsigned long flags;
746
747 greth = netdev_priv(dev);
748
749 for (count = 0; count < limit; ++count) {
750
751 bdp = greth->rx_bd_base + greth->rx_cur;
752 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
753 mb();
754 status = greth_read_bd(&bdp->stat);
755
756 if (unlikely(status & GRETH_BD_EN)) {
757 break;
758 }
759
760 dma_addr = greth_read_bd(&bdp->addr);
761 bad = 0;
762
763 /* Check status for errors. */
764 if (unlikely(status & GRETH_RXBD_STATUS)) {
765 if (status & GRETH_RXBD_ERR_FT) {
766 dev->stats.rx_length_errors++;
767 bad = 1;
768 }
769 if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
770 dev->stats.rx_frame_errors++;
771 bad = 1;
772 }
773 if (status & GRETH_RXBD_ERR_CRC) {
774 dev->stats.rx_crc_errors++;
775 bad = 1;
776 }
777 }
778 if (unlikely(bad)) {
779 dev->stats.rx_errors++;
780
781 } else {
782
783 pkt_len = status & GRETH_BD_LEN;
784
785 skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
786
787 if (unlikely(skb == NULL)) {
788
789 if (net_ratelimit())
790 dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
791
792 dev->stats.rx_dropped++;
793
794 } else {
795 skb_reserve(skb, NET_IP_ALIGN);
796
797 dma_sync_single_for_cpu(greth->dev,
798 dma_addr,
799 pkt_len,
800 DMA_FROM_DEVICE);
801
802 if (netif_msg_pktdata(greth))
803 greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
804
805 skb_put_data(skb, phys_to_virt(dma_addr),
806 pkt_len);
807
808 skb->protocol = eth_type_trans(skb, dev);
809 dev->stats.rx_bytes += pkt_len;
810 dev->stats.rx_packets++;
811 netif_receive_skb(skb);
812 }
813 }
814
815 status = GRETH_BD_EN | GRETH_BD_IE;
816 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
817 status |= GRETH_BD_WR;
818 }
819
820 wmb();
821 greth_write_bd(&bdp->stat, status);
822
823 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
824
825 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
826 greth_enable_rx(greth);
827 spin_unlock_irqrestore(&greth->devlock, flags);
828
829 greth->rx_cur = NEXT_RX(greth->rx_cur);
830 }
831
832 return count;
833 }
834
835 static inline int hw_checksummed(u32 status)
836 {
837
838 if (status & GRETH_RXBD_IP_FRAG)
839 return 0;
840
841 if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
842 return 0;
843
844 if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
845 return 0;
846
847 if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
848 return 0;
849
850 return 1;
851 }
852
853 static int greth_rx_gbit(struct net_device *dev, int limit)
854 {
855 struct greth_private *greth;
856 struct greth_bd *bdp;
857 struct sk_buff *skb, *newskb;
858 int pkt_len;
859 int bad, count = 0;
860 u32 status, dma_addr;
861 unsigned long flags;
862
863 greth = netdev_priv(dev);
864
865 for (count = 0; count < limit; ++count) {
866
867 bdp = greth->rx_bd_base + greth->rx_cur;
868 skb = greth->rx_skbuff[greth->rx_cur];
869 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
870 mb();
871 status = greth_read_bd(&bdp->stat);
872 bad = 0;
873
874 if (status & GRETH_BD_EN)
875 break;
876
877 /* Check status for errors. */
878 if (unlikely(status & GRETH_RXBD_STATUS)) {
879
880 if (status & GRETH_RXBD_ERR_FT) {
881 dev->stats.rx_length_errors++;
882 bad = 1;
883 } else if (status &
884 (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
885 dev->stats.rx_frame_errors++;
886 bad = 1;
887 } else if (status & GRETH_RXBD_ERR_CRC) {
888 dev->stats.rx_crc_errors++;
889 bad = 1;
890 }
891 }
892
893 /* Allocate new skb to replace current, not needed if the
894 * current skb can be reused */
895 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
896 skb_reserve(newskb, NET_IP_ALIGN);
897
898 dma_addr = dma_map_single(greth->dev,
899 newskb->data,
900 MAX_FRAME_SIZE + NET_IP_ALIGN,
901 DMA_FROM_DEVICE);
902
903 if (!dma_mapping_error(greth->dev, dma_addr)) {
904 /* Process the incoming frame. */
905 pkt_len = status & GRETH_BD_LEN;
906
907 dma_unmap_single(greth->dev,
908 greth_read_bd(&bdp->addr),
909 MAX_FRAME_SIZE + NET_IP_ALIGN,
910 DMA_FROM_DEVICE);
911
912 if (netif_msg_pktdata(greth))
913 greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
914
915 skb_put(skb, pkt_len);
916
917 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
918 skb->ip_summed = CHECKSUM_UNNECESSARY;
919 else
920 skb_checksum_none_assert(skb);
921
922 skb->protocol = eth_type_trans(skb, dev);
923 dev->stats.rx_packets++;
924 dev->stats.rx_bytes += pkt_len;
925 netif_receive_skb(skb);
926
927 greth->rx_skbuff[greth->rx_cur] = newskb;
928 greth_write_bd(&bdp->addr, dma_addr);
929 } else {
930 if (net_ratelimit())
931 dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
932 dev_kfree_skb(newskb);
933 /* reusing current skb, so it is a drop */
934 dev->stats.rx_dropped++;
935 }
936 } else if (bad) {
937 /* Bad Frame transfer, the skb is reused */
938 dev->stats.rx_dropped++;
939 } else {
940 /* Failed Allocating a new skb. This is rather stupid
941 * but the current "filled" skb is reused, as if
942 * transfer failure. One could argue that RX descriptor
943 * table handling should be divided into cleaning and
944 * filling as the TX part of the driver
945 */
946 if (net_ratelimit())
947 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
948 /* reusing current skb, so it is a drop */
949 dev->stats.rx_dropped++;
950 }
951
952 status = GRETH_BD_EN | GRETH_BD_IE;
953 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
954 status |= GRETH_BD_WR;
955 }
956
957 wmb();
958 greth_write_bd(&bdp->stat, status);
959 spin_lock_irqsave(&greth->devlock, flags);
960 greth_enable_rx(greth);
961 spin_unlock_irqrestore(&greth->devlock, flags);
962 greth->rx_cur = NEXT_RX(greth->rx_cur);
963 }
964
965 return count;
966
967 }
968
969 static int greth_poll(struct napi_struct *napi, int budget)
970 {
971 struct greth_private *greth;
972 int work_done = 0;
973 unsigned long flags;
974 u32 mask, ctrl;
975 greth = container_of(napi, struct greth_private, napi);
976
977 restart_txrx_poll:
978 if (greth->gbit_mac) {
979 greth_clean_tx_gbit(greth->netdev);
980 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
981 } else {
982 if (netif_queue_stopped(greth->netdev))
983 greth_clean_tx(greth->netdev);
984 work_done += greth_rx(greth->netdev, budget - work_done);
985 }
986
987 if (work_done < budget) {
988
989 spin_lock_irqsave(&greth->devlock, flags);
990
991 ctrl = GRETH_REGLOAD(greth->regs->control);
992 if ((greth->gbit_mac && (greth->tx_last != greth->tx_next)) ||
993 (!greth->gbit_mac && netif_queue_stopped(greth->netdev))) {
994 GRETH_REGSAVE(greth->regs->control,
995 ctrl | GRETH_TXI | GRETH_RXI);
996 mask = GRETH_INT_RX | GRETH_INT_RE |
997 GRETH_INT_TX | GRETH_INT_TE;
998 } else {
999 GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
1000 mask = GRETH_INT_RX | GRETH_INT_RE;
1001 }
1002
1003 if (GRETH_REGLOAD(greth->regs->status) & mask) {
1004 GRETH_REGSAVE(greth->regs->control, ctrl);
1005 spin_unlock_irqrestore(&greth->devlock, flags);
1006 goto restart_txrx_poll;
1007 } else {
1008 napi_complete_done(napi, work_done);
1009 spin_unlock_irqrestore(&greth->devlock, flags);
1010 }
1011 }
1012
1013 return work_done;
1014 }
1015
1016 static int greth_set_mac_add(struct net_device *dev, void *p)
1017 {
1018 struct sockaddr *addr = p;
1019 struct greth_private *greth;
1020 struct greth_regs *regs;
1021
1022 greth = netdev_priv(dev);
1023 regs = greth->regs;
1024
1025 if (!is_valid_ether_addr(addr->sa_data))
1026 return -EADDRNOTAVAIL;
1027
1028 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1029 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1030 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1031 dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1032
1033 return 0;
1034 }
1035
1036 static u32 greth_hash_get_index(__u8 *addr)
1037 {
1038 return (ether_crc(6, addr)) & 0x3F;
1039 }
1040
1041 static void greth_set_hash_filter(struct net_device *dev)
1042 {
1043 struct netdev_hw_addr *ha;
1044 struct greth_private *greth = netdev_priv(dev);
1045 struct greth_regs *regs = greth->regs;
1046 u32 mc_filter[2];
1047 unsigned int bitnr;
1048
1049 mc_filter[0] = mc_filter[1] = 0;
1050
1051 netdev_for_each_mc_addr(ha, dev) {
1052 bitnr = greth_hash_get_index(ha->addr);
1053 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1054 }
1055
1056 GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1057 GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1058 }
1059
1060 static void greth_set_multicast_list(struct net_device *dev)
1061 {
1062 int cfg;
1063 struct greth_private *greth = netdev_priv(dev);
1064 struct greth_regs *regs = greth->regs;
1065
1066 cfg = GRETH_REGLOAD(regs->control);
1067 if (dev->flags & IFF_PROMISC)
1068 cfg |= GRETH_CTRL_PR;
1069 else
1070 cfg &= ~GRETH_CTRL_PR;
1071
1072 if (greth->multicast) {
1073 if (dev->flags & IFF_ALLMULTI) {
1074 GRETH_REGSAVE(regs->hash_msb, -1);
1075 GRETH_REGSAVE(regs->hash_lsb, -1);
1076 cfg |= GRETH_CTRL_MCEN;
1077 GRETH_REGSAVE(regs->control, cfg);
1078 return;
1079 }
1080
1081 if (netdev_mc_empty(dev)) {
1082 cfg &= ~GRETH_CTRL_MCEN;
1083 GRETH_REGSAVE(regs->control, cfg);
1084 return;
1085 }
1086
1087 /* Setup multicast filter */
1088 greth_set_hash_filter(dev);
1089 cfg |= GRETH_CTRL_MCEN;
1090 }
1091 GRETH_REGSAVE(regs->control, cfg);
1092 }
1093
1094 static u32 greth_get_msglevel(struct net_device *dev)
1095 {
1096 struct greth_private *greth = netdev_priv(dev);
1097 return greth->msg_enable;
1098 }
1099
1100 static void greth_set_msglevel(struct net_device *dev, u32 value)
1101 {
1102 struct greth_private *greth = netdev_priv(dev);
1103 greth->msg_enable = value;
1104 }
1105
1106 static int greth_get_regs_len(struct net_device *dev)
1107 {
1108 return sizeof(struct greth_regs);
1109 }
1110
1111 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1112 {
1113 struct greth_private *greth = netdev_priv(dev);
1114
1115 strlcpy(info->driver, dev_driver_string(greth->dev),
1116 sizeof(info->driver));
1117 strlcpy(info->bus_info, greth->dev->bus->name, sizeof(info->bus_info));
1118 }
1119
1120 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1121 {
1122 int i;
1123 struct greth_private *greth = netdev_priv(dev);
1124 u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1125 u32 *buff = p;
1126
1127 for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1128 buff[i] = greth_read_bd(&greth_regs[i]);
1129 }
1130
1131 static const struct ethtool_ops greth_ethtool_ops = {
1132 .get_msglevel = greth_get_msglevel,
1133 .set_msglevel = greth_set_msglevel,
1134 .get_drvinfo = greth_get_drvinfo,
1135 .get_regs_len = greth_get_regs_len,
1136 .get_regs = greth_get_regs,
1137 .get_link = ethtool_op_get_link,
1138 .get_link_ksettings = phy_ethtool_get_link_ksettings,
1139 .set_link_ksettings = phy_ethtool_set_link_ksettings,
1140 };
1141
1142 static struct net_device_ops greth_netdev_ops = {
1143 .ndo_open = greth_open,
1144 .ndo_stop = greth_close,
1145 .ndo_start_xmit = greth_start_xmit,
1146 .ndo_set_mac_address = greth_set_mac_add,
1147 .ndo_validate_addr = eth_validate_addr,
1148 };
1149
1150 static inline int wait_for_mdio(struct greth_private *greth)
1151 {
1152 unsigned long timeout = jiffies + 4*HZ/100;
1153 while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1154 if (time_after(jiffies, timeout))
1155 return 0;
1156 }
1157 return 1;
1158 }
1159
1160 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1161 {
1162 struct greth_private *greth = bus->priv;
1163 int data;
1164
1165 if (!wait_for_mdio(greth))
1166 return -EBUSY;
1167
1168 GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1169
1170 if (!wait_for_mdio(greth))
1171 return -EBUSY;
1172
1173 if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1174 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1175 return data;
1176
1177 } else {
1178 return -1;
1179 }
1180 }
1181
1182 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1183 {
1184 struct greth_private *greth = bus->priv;
1185
1186 if (!wait_for_mdio(greth))
1187 return -EBUSY;
1188
1189 GRETH_REGSAVE(greth->regs->mdio,
1190 ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1191
1192 if (!wait_for_mdio(greth))
1193 return -EBUSY;
1194
1195 return 0;
1196 }
1197
1198 static void greth_link_change(struct net_device *dev)
1199 {
1200 struct greth_private *greth = netdev_priv(dev);
1201 struct phy_device *phydev = dev->phydev;
1202 unsigned long flags;
1203 int status_change = 0;
1204 u32 ctrl;
1205
1206 spin_lock_irqsave(&greth->devlock, flags);
1207
1208 if (phydev->link) {
1209
1210 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1211 ctrl = GRETH_REGLOAD(greth->regs->control) &
1212 ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1213
1214 if (phydev->duplex)
1215 ctrl |= GRETH_CTRL_FD;
1216
1217 if (phydev->speed == SPEED_100)
1218 ctrl |= GRETH_CTRL_SP;
1219 else if (phydev->speed == SPEED_1000)
1220 ctrl |= GRETH_CTRL_GB;
1221
1222 GRETH_REGSAVE(greth->regs->control, ctrl);
1223 greth->speed = phydev->speed;
1224 greth->duplex = phydev->duplex;
1225 status_change = 1;
1226 }
1227 }
1228
1229 if (phydev->link != greth->link) {
1230 if (!phydev->link) {
1231 greth->speed = 0;
1232 greth->duplex = -1;
1233 }
1234 greth->link = phydev->link;
1235
1236 status_change = 1;
1237 }
1238
1239 spin_unlock_irqrestore(&greth->devlock, flags);
1240
1241 if (status_change) {
1242 if (phydev->link)
1243 pr_debug("%s: link up (%d/%s)\n",
1244 dev->name, phydev->speed,
1245 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1246 else
1247 pr_debug("%s: link down\n", dev->name);
1248 }
1249 }
1250
1251 static int greth_mdio_probe(struct net_device *dev)
1252 {
1253 struct greth_private *greth = netdev_priv(dev);
1254 struct phy_device *phy = NULL;
1255 int ret;
1256
1257 /* Find the first PHY */
1258 phy = phy_find_first(greth->mdio);
1259
1260 if (!phy) {
1261 if (netif_msg_probe(greth))
1262 dev_err(&dev->dev, "no PHY found\n");
1263 return -ENXIO;
1264 }
1265
1266 ret = phy_connect_direct(dev, phy, &greth_link_change,
1267 greth->gbit_mac ? PHY_INTERFACE_MODE_GMII : PHY_INTERFACE_MODE_MII);
1268 if (ret) {
1269 if (netif_msg_ifup(greth))
1270 dev_err(&dev->dev, "could not attach to PHY\n");
1271 return ret;
1272 }
1273
1274 if (greth->gbit_mac)
1275 phy_set_max_speed(phy, SPEED_1000);
1276 else
1277 phy_set_max_speed(phy, SPEED_100);
1278
1279 linkmode_copy(phy->advertising, phy->supported);
1280
1281 greth->link = 0;
1282 greth->speed = 0;
1283 greth->duplex = -1;
1284
1285 return 0;
1286 }
1287
1288 static int greth_mdio_init(struct greth_private *greth)
1289 {
1290 int ret;
1291 unsigned long timeout;
1292 struct net_device *ndev = greth->netdev;
1293
1294 greth->mdio = mdiobus_alloc();
1295 if (!greth->mdio) {
1296 return -ENOMEM;
1297 }
1298
1299 greth->mdio->name = "greth-mdio";
1300 snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1301 greth->mdio->read = greth_mdio_read;
1302 greth->mdio->write = greth_mdio_write;
1303 greth->mdio->priv = greth;
1304
1305 ret = mdiobus_register(greth->mdio);
1306 if (ret) {
1307 goto error;
1308 }
1309
1310 ret = greth_mdio_probe(greth->netdev);
1311 if (ret) {
1312 if (netif_msg_probe(greth))
1313 dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1314 goto unreg_mdio;
1315 }
1316
1317 phy_start(ndev->phydev);
1318
1319 /* If Ethernet debug link is used make autoneg happen right away */
1320 if (greth->edcl && greth_edcl == 1) {
1321 phy_start_aneg(ndev->phydev);
1322 timeout = jiffies + 6*HZ;
1323 while (!phy_aneg_done(ndev->phydev) &&
1324 time_before(jiffies, timeout)) {
1325 }
1326 phy_read_status(ndev->phydev);
1327 greth_link_change(greth->netdev);
1328 }
1329
1330 return 0;
1331
1332 unreg_mdio:
1333 mdiobus_unregister(greth->mdio);
1334 error:
1335 mdiobus_free(greth->mdio);
1336 return ret;
1337 }
1338
1339 /* Initialize the GRETH MAC */
1340 static int greth_of_probe(struct platform_device *ofdev)
1341 {
1342 struct net_device *dev;
1343 struct greth_private *greth;
1344 struct greth_regs *regs;
1345
1346 int i;
1347 int err;
1348 int tmp;
1349 unsigned long timeout;
1350
1351 dev = alloc_etherdev(sizeof(struct greth_private));
1352
1353 if (dev == NULL)
1354 return -ENOMEM;
1355
1356 greth = netdev_priv(dev);
1357 greth->netdev = dev;
1358 greth->dev = &ofdev->dev;
1359
1360 if (greth_debug > 0)
1361 greth->msg_enable = greth_debug;
1362 else
1363 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1364
1365 spin_lock_init(&greth->devlock);
1366
1367 greth->regs = of_ioremap(&ofdev->resource[0], 0,
1368 resource_size(&ofdev->resource[0]),
1369 "grlib-greth regs");
1370
1371 if (greth->regs == NULL) {
1372 if (netif_msg_probe(greth))
1373 dev_err(greth->dev, "ioremap failure.\n");
1374 err = -EIO;
1375 goto error1;
1376 }
1377
1378 regs = greth->regs;
1379 greth->irq = ofdev->archdata.irqs[0];
1380
1381 dev_set_drvdata(greth->dev, dev);
1382 SET_NETDEV_DEV(dev, greth->dev);
1383
1384 if (netif_msg_probe(greth))
1385 dev_dbg(greth->dev, "resetting controller.\n");
1386
1387 /* Reset the controller. */
1388 GRETH_REGSAVE(regs->control, GRETH_RESET);
1389
1390 /* Wait for MAC to reset itself */
1391 timeout = jiffies + HZ/100;
1392 while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1393 if (time_after(jiffies, timeout)) {
1394 err = -EIO;
1395 if (netif_msg_probe(greth))
1396 dev_err(greth->dev, "timeout when waiting for reset.\n");
1397 goto error2;
1398 }
1399 }
1400
1401 /* Get default PHY address */
1402 greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1403
1404 /* Check if we have GBIT capable MAC */
1405 tmp = GRETH_REGLOAD(regs->control);
1406 greth->gbit_mac = (tmp >> 27) & 1;
1407
1408 /* Check for multicast capability */
1409 greth->multicast = (tmp >> 25) & 1;
1410
1411 greth->edcl = (tmp >> 31) & 1;
1412
1413 /* If we have EDCL we disable the EDCL speed-duplex FSM so
1414 * it doesn't interfere with the software */
1415 if (greth->edcl != 0)
1416 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1417
1418 /* Check if MAC can handle MDIO interrupts */
1419 greth->mdio_int_en = (tmp >> 26) & 1;
1420
1421 err = greth_mdio_init(greth);
1422 if (err) {
1423 if (netif_msg_probe(greth))
1424 dev_err(greth->dev, "failed to register MDIO bus\n");
1425 goto error2;
1426 }
1427
1428 /* Allocate TX descriptor ring in coherent memory */
1429 greth->tx_bd_base = dma_alloc_coherent(greth->dev, 1024,
1430 &greth->tx_bd_base_phys,
1431 GFP_KERNEL);
1432 if (!greth->tx_bd_base) {
1433 err = -ENOMEM;
1434 goto error3;
1435 }
1436
1437 /* Allocate RX descriptor ring in coherent memory */
1438 greth->rx_bd_base = dma_alloc_coherent(greth->dev, 1024,
1439 &greth->rx_bd_base_phys,
1440 GFP_KERNEL);
1441 if (!greth->rx_bd_base) {
1442 err = -ENOMEM;
1443 goto error4;
1444 }
1445
1446 /* Get MAC address from: module param, OF property or ID prom */
1447 for (i = 0; i < 6; i++) {
1448 if (macaddr[i] != 0)
1449 break;
1450 }
1451 if (i == 6) {
1452 const u8 *addr;
1453
1454 addr = of_get_mac_address(ofdev->dev.of_node);
1455 if (!IS_ERR(addr)) {
1456 for (i = 0; i < 6; i++)
1457 macaddr[i] = (unsigned int) addr[i];
1458 } else {
1459 #ifdef CONFIG_SPARC
1460 for (i = 0; i < 6; i++)
1461 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1462 #endif
1463 }
1464 }
1465
1466 for (i = 0; i < 6; i++)
1467 dev->dev_addr[i] = macaddr[i];
1468
1469 macaddr[5]++;
1470
1471 if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1472 if (netif_msg_probe(greth))
1473 dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1474 err = -EINVAL;
1475 goto error5;
1476 }
1477
1478 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1479 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1480 dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1481
1482 /* Clear all pending interrupts except PHY irq */
1483 GRETH_REGSAVE(regs->status, 0xFF);
1484
1485 if (greth->gbit_mac) {
1486 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1487 NETIF_F_RXCSUM;
1488 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1489 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1490 }
1491
1492 if (greth->multicast) {
1493 greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list;
1494 dev->flags |= IFF_MULTICAST;
1495 } else {
1496 dev->flags &= ~IFF_MULTICAST;
1497 }
1498
1499 dev->netdev_ops = &greth_netdev_ops;
1500 dev->ethtool_ops = &greth_ethtool_ops;
1501
1502 err = register_netdev(dev);
1503 if (err) {
1504 if (netif_msg_probe(greth))
1505 dev_err(greth->dev, "netdevice registration failed.\n");
1506 goto error5;
1507 }
1508
1509 /* setup NAPI */
1510 netif_napi_add(dev, &greth->napi, greth_poll, 64);
1511
1512 return 0;
1513
1514 error5:
1515 dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1516 error4:
1517 dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1518 error3:
1519 mdiobus_unregister(greth->mdio);
1520 error2:
1521 of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1522 error1:
1523 free_netdev(dev);
1524 return err;
1525 }
1526
1527 static int greth_of_remove(struct platform_device *of_dev)
1528 {
1529 struct net_device *ndev = platform_get_drvdata(of_dev);
1530 struct greth_private *greth = netdev_priv(ndev);
1531
1532 /* Free descriptor areas */
1533 dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1534
1535 dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1536
1537 if (ndev->phydev)
1538 phy_stop(ndev->phydev);
1539 mdiobus_unregister(greth->mdio);
1540
1541 unregister_netdev(ndev);
1542 free_netdev(ndev);
1543
1544 of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1545
1546 return 0;
1547 }
1548
1549 static const struct of_device_id greth_of_match[] = {
1550 {
1551 .name = "GAISLER_ETHMAC",
1552 },
1553 {
1554 .name = "01_01d",
1555 },
1556 {},
1557 };
1558
1559 MODULE_DEVICE_TABLE(of, greth_of_match);
1560
1561 static struct platform_driver greth_of_driver = {
1562 .driver = {
1563 .name = "grlib-greth",
1564 .of_match_table = greth_of_match,
1565 },
1566 .probe = greth_of_probe,
1567 .remove = greth_of_remove,
1568 };
1569
1570 module_platform_driver(greth_of_driver);
1571
1572 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1573 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1574 MODULE_LICENSE("GPL");
Linux with added FPC-III support