blob: b888abe6cd21032fc3a9f6e87abf1b1160f8a0f9 [file] [log] [blame]
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001/*
2 * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
3 *
4 * 2005-2009 (c) Aeroflex Gaisler AB
5 *
6 * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
7 * available in the GRLIB VHDL IP core library.
8 *
9 * Full documentation of both cores can be found here:
10 * http://www.gaisler.com/products/grlib/grip.pdf
11 *
12 * The Gigabit version supports scatter/gather DMA, any alignment of
13 * buffers and checksum offloading.
14 *
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License as published by the
17 * Free Software Foundation; either version 2 of the License, or (at your
18 * option) any later version.
19 *
20 * Contributors: Kristoffer Glembo
21 * Daniel Hellstrom
22 * Marko Isomaki
23 */
24
25#include <linux/module.h>
26#include <linux/uaccess.h>
27#include <linux/init.h>
28#include <linux/netdevice.h>
29#include <linux/etherdevice.h>
30#include <linux/ethtool.h>
31#include <linux/skbuff.h>
32#include <linux/io.h>
33#include <linux/crc32.h>
34#include <linux/mii.h>
35#include <linux/of_device.h>
36#include <linux/of_platform.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Kristoffer Glembod4c41132010-02-15 03:33:44 +000038#include <asm/cacheflush.h>
39#include <asm/byteorder.h>
40
41#ifdef CONFIG_SPARC
42#include <asm/idprom.h>
43#endif
44
45#include "greth.h"
46
47#define GRETH_DEF_MSG_ENABLE \
48 (NETIF_MSG_DRV | \
49 NETIF_MSG_PROBE | \
50 NETIF_MSG_LINK | \
51 NETIF_MSG_IFDOWN | \
52 NETIF_MSG_IFUP | \
53 NETIF_MSG_RX_ERR | \
54 NETIF_MSG_TX_ERR)
55
56static int greth_debug = -1; /* -1 == use GRETH_DEF_MSG_ENABLE as value */
57module_param(greth_debug, int, 0);
58MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
59
60/* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
61static int macaddr[6];
62module_param_array(macaddr, int, NULL, 0);
63MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
64
65static int greth_edcl = 1;
66module_param(greth_edcl, int, 0);
67MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
68
69static int greth_open(struct net_device *dev);
kirjanov@gmail.com41a655b2010-02-24 10:25:33 +000070static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
71 struct net_device *dev);
72static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
73 struct net_device *dev);
Kristoffer Glembod4c41132010-02-15 03:33:44 +000074static int greth_rx(struct net_device *dev, int limit);
75static int greth_rx_gbit(struct net_device *dev, int limit);
76static void greth_clean_tx(struct net_device *dev);
77static void greth_clean_tx_gbit(struct net_device *dev);
78static irqreturn_t greth_interrupt(int irq, void *dev_id);
79static int greth_close(struct net_device *dev);
80static int greth_set_mac_add(struct net_device *dev, void *p);
81static void greth_set_multicast_list(struct net_device *dev);
82
83#define GRETH_REGLOAD(a) (be32_to_cpu(__raw_readl(&(a))))
84#define GRETH_REGSAVE(a, v) (__raw_writel(cpu_to_be32(v), &(a)))
85#define GRETH_REGORIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
86#define GRETH_REGANDIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
87
88#define NEXT_TX(N) (((N) + 1) & GRETH_TXBD_NUM_MASK)
89#define SKIP_TX(N, C) (((N) + C) & GRETH_TXBD_NUM_MASK)
90#define NEXT_RX(N) (((N) + 1) & GRETH_RXBD_NUM_MASK)
91
92static void greth_print_rx_packet(void *addr, int len)
93{
94 print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
95 addr, len, true);
96}
97
98static void greth_print_tx_packet(struct sk_buff *skb)
99{
100 int i;
101 int length;
102
103 if (skb_shinfo(skb)->nr_frags == 0)
104 length = skb->len;
105 else
106 length = skb_headlen(skb);
107
108 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
109 skb->data, length, true);
110
111 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
112
113 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
114 phys_to_virt(page_to_phys(skb_shinfo(skb)->frags[i].page)) +
115 skb_shinfo(skb)->frags[i].page_offset,
116 length, true);
117 }
118}
119
120static inline void greth_enable_tx(struct greth_private *greth)
121{
122 wmb();
123 GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
124}
125
126static inline void greth_disable_tx(struct greth_private *greth)
127{
128 GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
129}
130
131static inline void greth_enable_rx(struct greth_private *greth)
132{
133 wmb();
134 GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
135}
136
137static inline void greth_disable_rx(struct greth_private *greth)
138{
139 GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
140}
141
142static inline void greth_enable_irqs(struct greth_private *greth)
143{
144 GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
145}
146
147static inline void greth_disable_irqs(struct greth_private *greth)
148{
149 GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
150}
151
152static inline void greth_write_bd(u32 *bd, u32 val)
153{
154 __raw_writel(cpu_to_be32(val), bd);
155}
156
157static inline u32 greth_read_bd(u32 *bd)
158{
159 return be32_to_cpu(__raw_readl(bd));
160}
161
162static void greth_clean_rings(struct greth_private *greth)
163{
164 int i;
165 struct greth_bd *rx_bdp = greth->rx_bd_base;
166 struct greth_bd *tx_bdp = greth->tx_bd_base;
167
168 if (greth->gbit_mac) {
169
170 /* Free and unmap RX buffers */
171 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
172 if (greth->rx_skbuff[i] != NULL) {
173 dev_kfree_skb(greth->rx_skbuff[i]);
174 dma_unmap_single(greth->dev,
175 greth_read_bd(&rx_bdp->addr),
176 MAX_FRAME_SIZE+NET_IP_ALIGN,
177 DMA_FROM_DEVICE);
178 }
179 }
180
181 /* TX buffers */
182 while (greth->tx_free < GRETH_TXBD_NUM) {
183
184 struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
185 int nr_frags = skb_shinfo(skb)->nr_frags;
186 tx_bdp = greth->tx_bd_base + greth->tx_last;
187 greth->tx_last = NEXT_TX(greth->tx_last);
188
189 dma_unmap_single(greth->dev,
190 greth_read_bd(&tx_bdp->addr),
191 skb_headlen(skb),
192 DMA_TO_DEVICE);
193
194 for (i = 0; i < nr_frags; i++) {
195 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
196 tx_bdp = greth->tx_bd_base + greth->tx_last;
197
198 dma_unmap_page(greth->dev,
199 greth_read_bd(&tx_bdp->addr),
200 frag->size,
201 DMA_TO_DEVICE);
202
203 greth->tx_last = NEXT_TX(greth->tx_last);
204 }
205 greth->tx_free += nr_frags+1;
206 dev_kfree_skb(skb);
207 }
208
209
210 } else { /* 10/100 Mbps MAC */
211
212 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
213 kfree(greth->rx_bufs[i]);
214 dma_unmap_single(greth->dev,
215 greth_read_bd(&rx_bdp->addr),
216 MAX_FRAME_SIZE,
217 DMA_FROM_DEVICE);
218 }
219 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
220 kfree(greth->tx_bufs[i]);
221 dma_unmap_single(greth->dev,
222 greth_read_bd(&tx_bdp->addr),
223 MAX_FRAME_SIZE,
224 DMA_TO_DEVICE);
225 }
226 }
227}
228
229static int greth_init_rings(struct greth_private *greth)
230{
231 struct sk_buff *skb;
232 struct greth_bd *rx_bd, *tx_bd;
233 u32 dma_addr;
234 int i;
235
236 rx_bd = greth->rx_bd_base;
237 tx_bd = greth->tx_bd_base;
238
239 /* Initialize descriptor rings and buffers */
240 if (greth->gbit_mac) {
241
242 for (i = 0; i < GRETH_RXBD_NUM; i++) {
243 skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
244 if (skb == NULL) {
245 if (netif_msg_ifup(greth))
246 dev_err(greth->dev, "Error allocating DMA ring.\n");
247 goto cleanup;
248 }
249 skb_reserve(skb, NET_IP_ALIGN);
250 dma_addr = dma_map_single(greth->dev,
251 skb->data,
252 MAX_FRAME_SIZE+NET_IP_ALIGN,
253 DMA_FROM_DEVICE);
254
255 if (dma_mapping_error(greth->dev, dma_addr)) {
256 if (netif_msg_ifup(greth))
257 dev_err(greth->dev, "Could not create initial DMA mapping\n");
258 goto cleanup;
259 }
260 greth->rx_skbuff[i] = skb;
261 greth_write_bd(&rx_bd[i].addr, dma_addr);
262 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
263 }
264
265 } else {
266
267 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
268 for (i = 0; i < GRETH_RXBD_NUM; i++) {
269
270 greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
271
272 if (greth->rx_bufs[i] == NULL) {
273 if (netif_msg_ifup(greth))
274 dev_err(greth->dev, "Error allocating DMA ring.\n");
275 goto cleanup;
276 }
277
278 dma_addr = dma_map_single(greth->dev,
279 greth->rx_bufs[i],
280 MAX_FRAME_SIZE,
281 DMA_FROM_DEVICE);
282
283 if (dma_mapping_error(greth->dev, dma_addr)) {
284 if (netif_msg_ifup(greth))
285 dev_err(greth->dev, "Could not create initial DMA mapping\n");
286 goto cleanup;
287 }
288 greth_write_bd(&rx_bd[i].addr, dma_addr);
289 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
290 }
291 for (i = 0; i < GRETH_TXBD_NUM; i++) {
292
293 greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
294
295 if (greth->tx_bufs[i] == NULL) {
296 if (netif_msg_ifup(greth))
297 dev_err(greth->dev, "Error allocating DMA ring.\n");
298 goto cleanup;
299 }
300
301 dma_addr = dma_map_single(greth->dev,
302 greth->tx_bufs[i],
303 MAX_FRAME_SIZE,
304 DMA_TO_DEVICE);
305
306 if (dma_mapping_error(greth->dev, dma_addr)) {
307 if (netif_msg_ifup(greth))
308 dev_err(greth->dev, "Could not create initial DMA mapping\n");
309 goto cleanup;
310 }
311 greth_write_bd(&tx_bd[i].addr, dma_addr);
312 greth_write_bd(&tx_bd[i].stat, 0);
313 }
314 }
315 greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
316 greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
317
318 /* Initialize pointers. */
319 greth->rx_cur = 0;
320 greth->tx_next = 0;
321 greth->tx_last = 0;
322 greth->tx_free = GRETH_TXBD_NUM;
323
324 /* Initialize descriptor base address */
325 GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
326 GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
327
328 return 0;
329
330cleanup:
331 greth_clean_rings(greth);
332 return -ENOMEM;
333}
334
335static int greth_open(struct net_device *dev)
336{
337 struct greth_private *greth = netdev_priv(dev);
338 int err;
339
340 err = greth_init_rings(greth);
341 if (err) {
342 if (netif_msg_ifup(greth))
343 dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
344 return err;
345 }
346
347 err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
348 if (err) {
349 if (netif_msg_ifup(greth))
350 dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
351 greth_clean_rings(greth);
352 return err;
353 }
354
355 if (netif_msg_ifup(greth))
356 dev_dbg(&dev->dev, " starting queue\n");
357 netif_start_queue(dev);
358
Daniel Hellstrombbe9e632011-01-14 03:02:38 +0000359 GRETH_REGSAVE(greth->regs->status, 0xFF);
360
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000361 napi_enable(&greth->napi);
362
363 greth_enable_irqs(greth);
364 greth_enable_tx(greth);
365 greth_enable_rx(greth);
366 return 0;
367
368}
369
370static int greth_close(struct net_device *dev)
371{
372 struct greth_private *greth = netdev_priv(dev);
373
374 napi_disable(&greth->napi);
375
Daniel Hellstrombbe9e632011-01-14 03:02:38 +0000376 greth_disable_irqs(greth);
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000377 greth_disable_tx(greth);
Daniel Hellstrombbe9e632011-01-14 03:02:38 +0000378 greth_disable_rx(greth);
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000379
380 netif_stop_queue(dev);
381
382 free_irq(greth->irq, (void *) dev);
383
384 greth_clean_rings(greth);
385
386 return 0;
387}
388
kirjanov@gmail.com41a655b2010-02-24 10:25:33 +0000389static netdev_tx_t
390greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000391{
392 struct greth_private *greth = netdev_priv(dev);
393 struct greth_bd *bdp;
394 int err = NETDEV_TX_OK;
395 u32 status, dma_addr;
396
397 bdp = greth->tx_bd_base + greth->tx_next;
398
399 if (unlikely(greth->tx_free <= 0)) {
400 netif_stop_queue(dev);
401 return NETDEV_TX_BUSY;
402 }
403
404 if (netif_msg_pktdata(greth))
405 greth_print_tx_packet(skb);
406
407
408 if (unlikely(skb->len > MAX_FRAME_SIZE)) {
409 dev->stats.tx_errors++;
410 goto out;
411 }
412
413 dma_addr = greth_read_bd(&bdp->addr);
414
415 memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
416
417 dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
418
419 status = GRETH_BD_EN | (skb->len & GRETH_BD_LEN);
420
421 /* Wrap around descriptor ring */
422 if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
423 status |= GRETH_BD_WR;
424 }
425
426 greth->tx_next = NEXT_TX(greth->tx_next);
427 greth->tx_free--;
428
429 /* No more descriptors */
430 if (unlikely(greth->tx_free == 0)) {
431
432 /* Free transmitted descriptors */
433 greth_clean_tx(dev);
434
435 /* If nothing was cleaned, stop queue & wait for irq */
436 if (unlikely(greth->tx_free == 0)) {
437 status |= GRETH_BD_IE;
438 netif_stop_queue(dev);
439 }
440 }
441
442 /* Write descriptor control word and enable transmission */
443 greth_write_bd(&bdp->stat, status);
444 greth_enable_tx(greth);
445
446out:
447 dev_kfree_skb(skb);
448 return err;
449}
450
451
kirjanov@gmail.com41a655b2010-02-24 10:25:33 +0000452static netdev_tx_t
453greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000454{
455 struct greth_private *greth = netdev_priv(dev);
456 struct greth_bd *bdp;
457 u32 status = 0, dma_addr;
458 int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
459
460 nr_frags = skb_shinfo(skb)->nr_frags;
461
462 if (greth->tx_free < nr_frags + 1) {
463 netif_stop_queue(dev);
464 err = NETDEV_TX_BUSY;
465 goto out;
466 }
467
468 if (netif_msg_pktdata(greth))
469 greth_print_tx_packet(skb);
470
471 if (unlikely(skb->len > MAX_FRAME_SIZE)) {
472 dev->stats.tx_errors++;
473 goto out;
474 }
475
476 /* Save skb pointer. */
477 greth->tx_skbuff[greth->tx_next] = skb;
478
479 /* Linear buf */
480 if (nr_frags != 0)
481 status = GRETH_TXBD_MORE;
482
483 status |= GRETH_TXBD_CSALL;
484 status |= skb_headlen(skb) & GRETH_BD_LEN;
485 if (greth->tx_next == GRETH_TXBD_NUM_MASK)
486 status |= GRETH_BD_WR;
487
488
489 bdp = greth->tx_bd_base + greth->tx_next;
490 greth_write_bd(&bdp->stat, status);
491 dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
492
493 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
494 goto map_error;
495
496 greth_write_bd(&bdp->addr, dma_addr);
497
498 curr_tx = NEXT_TX(greth->tx_next);
499
500 /* Frags */
501 for (i = 0; i < nr_frags; i++) {
502 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
503 greth->tx_skbuff[curr_tx] = NULL;
504 bdp = greth->tx_bd_base + curr_tx;
505
Daniel Hellstrom2a2bc012011-01-14 03:02:39 +0000506 status = GRETH_TXBD_CSALL | GRETH_BD_EN;
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000507 status |= frag->size & GRETH_BD_LEN;
508
509 /* Wrap around descriptor ring */
510 if (curr_tx == GRETH_TXBD_NUM_MASK)
511 status |= GRETH_BD_WR;
512
513 /* More fragments left */
514 if (i < nr_frags - 1)
515 status |= GRETH_TXBD_MORE;
516
517 /* ... last fragment, check if out of descriptors */
518 else if (greth->tx_free - nr_frags - 1 < (MAX_SKB_FRAGS + 1)) {
519
520 /* Enable interrupts and stop queue */
521 status |= GRETH_BD_IE;
522 netif_stop_queue(dev);
523 }
524
525 greth_write_bd(&bdp->stat, status);
526
527 dma_addr = dma_map_page(greth->dev,
528 frag->page,
529 frag->page_offset,
530 frag->size,
531 DMA_TO_DEVICE);
532
533 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
534 goto frag_map_error;
535
536 greth_write_bd(&bdp->addr, dma_addr);
537
538 curr_tx = NEXT_TX(curr_tx);
539 }
540
541 wmb();
542
Daniel Hellstrom2a2bc012011-01-14 03:02:39 +0000543 /* Enable the descriptor chain by enabling the first descriptor */
544 bdp = greth->tx_bd_base + greth->tx_next;
545 greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
546 greth->tx_next = curr_tx;
547 greth->tx_free -= nr_frags + 1;
548
549 wmb();
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000550
551 greth_enable_tx(greth);
552
553 return NETDEV_TX_OK;
554
555frag_map_error:
Daniel Hellstrom2a2bc012011-01-14 03:02:39 +0000556 /* Unmap SKB mappings that succeeded and disable descriptor */
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000557 for (i = 0; greth->tx_next + i != curr_tx; i++) {
558 bdp = greth->tx_bd_base + greth->tx_next + i;
559 dma_unmap_single(greth->dev,
560 greth_read_bd(&bdp->addr),
561 greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
562 DMA_TO_DEVICE);
Daniel Hellstrom2a2bc012011-01-14 03:02:39 +0000563 greth_write_bd(&bdp->stat, 0);
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000564 }
565map_error:
566 if (net_ratelimit())
567 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
568 dev_kfree_skb(skb);
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000569out:
570 return err;
571}
572
573
574static irqreturn_t greth_interrupt(int irq, void *dev_id)
575{
576 struct net_device *dev = dev_id;
577 struct greth_private *greth;
578 u32 status;
579 irqreturn_t retval = IRQ_NONE;
580
581 greth = netdev_priv(dev);
582
583 spin_lock(&greth->devlock);
584
585 /* Get the interrupt events that caused us to be here. */
586 status = GRETH_REGLOAD(greth->regs->status);
587
588 /* Handle rx and tx interrupts through poll */
Daniel Hellstrom1ca23432011-01-14 03:02:42 +0000589 if (status & (GRETH_INT_RE | GRETH_INT_RX |
590 GRETH_INT_TE | GRETH_INT_TX)) {
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000591
592 /* Clear interrupt status */
Daniel Hellstrom1ca23432011-01-14 03:02:42 +0000593 GRETH_REGSAVE(greth->regs->status,
594 status & (GRETH_INT_RE | GRETH_INT_RX |
595 GRETH_INT_TE | GRETH_INT_TX));
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000596 retval = IRQ_HANDLED;
597
598 /* Disable interrupts and schedule poll() */
599 greth_disable_irqs(greth);
600 napi_schedule(&greth->napi);
601 }
602
603 mmiowb();
604 spin_unlock(&greth->devlock);
605
606 return retval;
607}
608
609static void greth_clean_tx(struct net_device *dev)
610{
611 struct greth_private *greth;
612 struct greth_bd *bdp;
613 u32 stat;
614
615 greth = netdev_priv(dev);
616
617 while (1) {
618 bdp = greth->tx_bd_base + greth->tx_last;
619 stat = greth_read_bd(&bdp->stat);
620
621 if (unlikely(stat & GRETH_BD_EN))
622 break;
623
624 if (greth->tx_free == GRETH_TXBD_NUM)
625 break;
626
627 /* Check status for errors */
628 if (unlikely(stat & GRETH_TXBD_STATUS)) {
629 dev->stats.tx_errors++;
630 if (stat & GRETH_TXBD_ERR_AL)
631 dev->stats.tx_aborted_errors++;
632 if (stat & GRETH_TXBD_ERR_UE)
633 dev->stats.tx_fifo_errors++;
634 }
635 dev->stats.tx_packets++;
636 greth->tx_last = NEXT_TX(greth->tx_last);
637 greth->tx_free++;
638 }
639
640 if (greth->tx_free > 0) {
641 netif_wake_queue(dev);
642 }
643
644}
645
646static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
647{
648 /* Check status for errors */
649 if (unlikely(stat & GRETH_TXBD_STATUS)) {
650 dev->stats.tx_errors++;
651 if (stat & GRETH_TXBD_ERR_AL)
652 dev->stats.tx_aborted_errors++;
653 if (stat & GRETH_TXBD_ERR_UE)
654 dev->stats.tx_fifo_errors++;
655 if (stat & GRETH_TXBD_ERR_LC)
656 dev->stats.tx_aborted_errors++;
657 }
658 dev->stats.tx_packets++;
659}
660
661static void greth_clean_tx_gbit(struct net_device *dev)
662{
663 struct greth_private *greth;
664 struct greth_bd *bdp, *bdp_last_frag;
665 struct sk_buff *skb;
666 u32 stat;
667 int nr_frags, i;
668
669 greth = netdev_priv(dev);
670
671 while (greth->tx_free < GRETH_TXBD_NUM) {
672
673 skb = greth->tx_skbuff[greth->tx_last];
674
675 nr_frags = skb_shinfo(skb)->nr_frags;
676
677 /* We only clean fully completed SKBs */
678 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
679 stat = bdp_last_frag->stat;
680
681 if (stat & GRETH_BD_EN)
682 break;
683
684 greth->tx_skbuff[greth->tx_last] = NULL;
685
686 greth_update_tx_stats(dev, stat);
687
688 bdp = greth->tx_bd_base + greth->tx_last;
689
690 greth->tx_last = NEXT_TX(greth->tx_last);
691
692 dma_unmap_single(greth->dev,
693 greth_read_bd(&bdp->addr),
694 skb_headlen(skb),
695 DMA_TO_DEVICE);
696
697 for (i = 0; i < nr_frags; i++) {
698 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
699 bdp = greth->tx_bd_base + greth->tx_last;
700
701 dma_unmap_page(greth->dev,
702 greth_read_bd(&bdp->addr),
703 frag->size,
704 DMA_TO_DEVICE);
705
706 greth->tx_last = NEXT_TX(greth->tx_last);
707 }
708 greth->tx_free += nr_frags+1;
709 dev_kfree_skb(skb);
710 }
711 if (greth->tx_free > (MAX_SKB_FRAGS + 1)) {
712 netif_wake_queue(dev);
713 }
714}
715
716static int greth_pending_packets(struct greth_private *greth)
717{
718 struct greth_bd *bdp;
719 u32 status;
720 bdp = greth->rx_bd_base + greth->rx_cur;
721 status = greth_read_bd(&bdp->stat);
722 if (status & GRETH_BD_EN)
723 return 0;
724 else
725 return 1;
726}
727
728static int greth_rx(struct net_device *dev, int limit)
729{
730 struct greth_private *greth;
731 struct greth_bd *bdp;
732 struct sk_buff *skb;
733 int pkt_len;
734 int bad, count;
735 u32 status, dma_addr;
736
737 greth = netdev_priv(dev);
738
739 for (count = 0; count < limit; ++count) {
740
741 bdp = greth->rx_bd_base + greth->rx_cur;
742 status = greth_read_bd(&bdp->stat);
743 dma_addr = greth_read_bd(&bdp->addr);
744 bad = 0;
745
746 if (unlikely(status & GRETH_BD_EN)) {
747 break;
748 }
749
750 /* Check status for errors. */
751 if (unlikely(status & GRETH_RXBD_STATUS)) {
752 if (status & GRETH_RXBD_ERR_FT) {
753 dev->stats.rx_length_errors++;
754 bad = 1;
755 }
756 if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
757 dev->stats.rx_frame_errors++;
758 bad = 1;
759 }
760 if (status & GRETH_RXBD_ERR_CRC) {
761 dev->stats.rx_crc_errors++;
762 bad = 1;
763 }
764 }
765 if (unlikely(bad)) {
766 dev->stats.rx_errors++;
767
768 } else {
769
770 pkt_len = status & GRETH_BD_LEN;
771
772 skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
773
774 if (unlikely(skb == NULL)) {
775
776 if (net_ratelimit())
777 dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
778
779 dev->stats.rx_dropped++;
780
781 } else {
782 skb_reserve(skb, NET_IP_ALIGN);
783 skb->dev = dev;
784
785 dma_sync_single_for_cpu(greth->dev,
786 dma_addr,
787 pkt_len,
788 DMA_FROM_DEVICE);
789
790 if (netif_msg_pktdata(greth))
791 greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
792
793 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
794
795 skb->protocol = eth_type_trans(skb, dev);
796 dev->stats.rx_packets++;
797 netif_receive_skb(skb);
798 }
799 }
800
801 status = GRETH_BD_EN | GRETH_BD_IE;
802 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
803 status |= GRETH_BD_WR;
804 }
805
806 wmb();
807 greth_write_bd(&bdp->stat, status);
808
809 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
810
811 greth_enable_rx(greth);
812
813 greth->rx_cur = NEXT_RX(greth->rx_cur);
814 }
815
816 return count;
817}
818
819static inline int hw_checksummed(u32 status)
820{
821
822 if (status & GRETH_RXBD_IP_FRAG)
823 return 0;
824
825 if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
826 return 0;
827
828 if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
829 return 0;
830
831 if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
832 return 0;
833
834 return 1;
835}
836
837static int greth_rx_gbit(struct net_device *dev, int limit)
838{
839 struct greth_private *greth;
840 struct greth_bd *bdp;
841 struct sk_buff *skb, *newskb;
842 int pkt_len;
843 int bad, count = 0;
844 u32 status, dma_addr;
845
846 greth = netdev_priv(dev);
847
848 for (count = 0; count < limit; ++count) {
849
850 bdp = greth->rx_bd_base + greth->rx_cur;
851 skb = greth->rx_skbuff[greth->rx_cur];
852 status = greth_read_bd(&bdp->stat);
853 bad = 0;
854
855 if (status & GRETH_BD_EN)
856 break;
857
858 /* Check status for errors. */
859 if (unlikely(status & GRETH_RXBD_STATUS)) {
860
861 if (status & GRETH_RXBD_ERR_FT) {
862 dev->stats.rx_length_errors++;
863 bad = 1;
864 } else if (status &
865 (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
866 dev->stats.rx_frame_errors++;
867 bad = 1;
868 } else if (status & GRETH_RXBD_ERR_CRC) {
869 dev->stats.rx_crc_errors++;
870 bad = 1;
871 }
872 }
873
Daniel Hellstromb669e7f2011-01-14 03:02:40 +0000874 /* Allocate new skb to replace current, not needed if the
875 * current skb can be reused */
876 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000877 skb_reserve(newskb, NET_IP_ALIGN);
878
879 dma_addr = dma_map_single(greth->dev,
880 newskb->data,
881 MAX_FRAME_SIZE + NET_IP_ALIGN,
882 DMA_FROM_DEVICE);
883
884 if (!dma_mapping_error(greth->dev, dma_addr)) {
885 /* Process the incoming frame. */
886 pkt_len = status & GRETH_BD_LEN;
887
888 dma_unmap_single(greth->dev,
889 greth_read_bd(&bdp->addr),
890 MAX_FRAME_SIZE + NET_IP_ALIGN,
891 DMA_FROM_DEVICE);
892
893 if (netif_msg_pktdata(greth))
894 greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
895
896 skb_put(skb, pkt_len);
897
898 if (greth->flags & GRETH_FLAG_RX_CSUM && hw_checksummed(status))
899 skb->ip_summed = CHECKSUM_UNNECESSARY;
900 else
Eric Dumazetbc8acf22010-09-02 13:07:41 -0700901 skb_checksum_none_assert(skb);
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000902
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000903 skb->protocol = eth_type_trans(skb, dev);
904 dev->stats.rx_packets++;
905 netif_receive_skb(skb);
906
907 greth->rx_skbuff[greth->rx_cur] = newskb;
908 greth_write_bd(&bdp->addr, dma_addr);
909 } else {
910 if (net_ratelimit())
911 dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
912 dev_kfree_skb(newskb);
Daniel Hellstromb669e7f2011-01-14 03:02:40 +0000913 /* reusing current skb, so it is a drop */
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000914 dev->stats.rx_dropped++;
915 }
Daniel Hellstromb669e7f2011-01-14 03:02:40 +0000916 } else if (bad) {
917 /* Bad Frame transfer, the skb is reused */
918 dev->stats.rx_dropped++;
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000919 } else {
Daniel Hellstromb669e7f2011-01-14 03:02:40 +0000920 /* Failed Allocating a new skb. This is rather stupid
921 * but the current "filled" skb is reused, as if
922 * transfer failure. One could argue that RX descriptor
923 * table handling should be divided into cleaning and
924 * filling as the TX part of the driver
925 */
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000926 if (net_ratelimit())
927 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
Daniel Hellstromb669e7f2011-01-14 03:02:40 +0000928 /* reusing current skb, so it is a drop */
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000929 dev->stats.rx_dropped++;
930 }
931
932 status = GRETH_BD_EN | GRETH_BD_IE;
933 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
934 status |= GRETH_BD_WR;
935 }
936
937 wmb();
938 greth_write_bd(&bdp->stat, status);
939 greth_enable_rx(greth);
940 greth->rx_cur = NEXT_RX(greth->rx_cur);
941 }
942
943 return count;
944
945}
946
947static int greth_poll(struct napi_struct *napi, int budget)
948{
949 struct greth_private *greth;
950 int work_done = 0;
951 greth = container_of(napi, struct greth_private, napi);
952
953 if (greth->gbit_mac) {
954 greth_clean_tx_gbit(greth->netdev);
955 } else {
956 greth_clean_tx(greth->netdev);
957 }
958
959restart_poll:
960 if (greth->gbit_mac) {
961 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
962 } else {
963 work_done += greth_rx(greth->netdev, budget - work_done);
964 }
965
966 if (work_done < budget) {
967
968 napi_complete(napi);
969
970 if (greth_pending_packets(greth)) {
971 napi_reschedule(napi);
972 goto restart_poll;
973 }
974 }
975
976 greth_enable_irqs(greth);
977 return work_done;
978}
979
980static int greth_set_mac_add(struct net_device *dev, void *p)
981{
982 struct sockaddr *addr = p;
983 struct greth_private *greth;
984 struct greth_regs *regs;
985
kirjanov@gmail.com6e037182010-02-19 05:00:52 +0000986 greth = netdev_priv(dev);
Kristoffer Glembod4c41132010-02-15 03:33:44 +0000987 regs = (struct greth_regs *) greth->regs;
988
989 if (!is_valid_ether_addr(addr->sa_data))
990 return -EINVAL;
991
992 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
993
994 GRETH_REGSAVE(regs->esa_msb, addr->sa_data[0] << 8 | addr->sa_data[1]);
995 GRETH_REGSAVE(regs->esa_lsb,
996 addr->sa_data[2] << 24 | addr->
997 sa_data[3] << 16 | addr->sa_data[4] << 8 | addr->sa_data[5]);
998 return 0;
999}
1000
1001static u32 greth_hash_get_index(__u8 *addr)
1002{
1003 return (ether_crc(6, addr)) & 0x3F;
1004}
1005
1006static void greth_set_hash_filter(struct net_device *dev)
1007{
Jiri Pirko22bedad32010-04-01 21:22:57 +00001008 struct netdev_hw_addr *ha;
kirjanov@gmail.com6e037182010-02-19 05:00:52 +00001009 struct greth_private *greth = netdev_priv(dev);
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001010 struct greth_regs *regs = (struct greth_regs *) greth->regs;
1011 u32 mc_filter[2];
kirjanov@gmail.com6e037182010-02-19 05:00:52 +00001012 unsigned int bitnr;
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001013
1014 mc_filter[0] = mc_filter[1] = 0;
1015
Jiri Pirko22bedad32010-04-01 21:22:57 +00001016 netdev_for_each_mc_addr(ha, dev) {
1017 bitnr = greth_hash_get_index(ha->addr);
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001018 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1019 }
1020
1021 GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1022 GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1023}
1024
1025static void greth_set_multicast_list(struct net_device *dev)
1026{
1027 int cfg;
1028 struct greth_private *greth = netdev_priv(dev);
1029 struct greth_regs *regs = (struct greth_regs *) greth->regs;
1030
1031 cfg = GRETH_REGLOAD(regs->control);
1032 if (dev->flags & IFF_PROMISC)
1033 cfg |= GRETH_CTRL_PR;
1034 else
1035 cfg &= ~GRETH_CTRL_PR;
1036
1037 if (greth->multicast) {
1038 if (dev->flags & IFF_ALLMULTI) {
1039 GRETH_REGSAVE(regs->hash_msb, -1);
1040 GRETH_REGSAVE(regs->hash_lsb, -1);
1041 cfg |= GRETH_CTRL_MCEN;
1042 GRETH_REGSAVE(regs->control, cfg);
1043 return;
1044 }
1045
kirjanov@gmail.com6e037182010-02-19 05:00:52 +00001046 if (netdev_mc_empty(dev)) {
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001047 cfg &= ~GRETH_CTRL_MCEN;
1048 GRETH_REGSAVE(regs->control, cfg);
1049 return;
1050 }
1051
1052 /* Setup multicast filter */
1053 greth_set_hash_filter(dev);
1054 cfg |= GRETH_CTRL_MCEN;
1055 }
1056 GRETH_REGSAVE(regs->control, cfg);
1057}
1058
1059static u32 greth_get_msglevel(struct net_device *dev)
1060{
1061 struct greth_private *greth = netdev_priv(dev);
1062 return greth->msg_enable;
1063}
1064
1065static void greth_set_msglevel(struct net_device *dev, u32 value)
1066{
1067 struct greth_private *greth = netdev_priv(dev);
1068 greth->msg_enable = value;
1069}
1070static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1071{
1072 struct greth_private *greth = netdev_priv(dev);
1073 struct phy_device *phy = greth->phy;
1074
1075 if (!phy)
1076 return -ENODEV;
1077
1078 return phy_ethtool_gset(phy, cmd);
1079}
1080
1081static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1082{
1083 struct greth_private *greth = netdev_priv(dev);
1084 struct phy_device *phy = greth->phy;
1085
1086 if (!phy)
1087 return -ENODEV;
1088
1089 return phy_ethtool_sset(phy, cmd);
1090}
1091
1092static int greth_get_regs_len(struct net_device *dev)
1093{
1094 return sizeof(struct greth_regs);
1095}
1096
1097static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1098{
1099 struct greth_private *greth = netdev_priv(dev);
1100
1101 strncpy(info->driver, dev_driver_string(greth->dev), 32);
1102 strncpy(info->version, "revision: 1.0", 32);
1103 strncpy(info->bus_info, greth->dev->bus->name, 32);
1104 strncpy(info->fw_version, "N/A", 32);
1105 info->eedump_len = 0;
1106 info->regdump_len = sizeof(struct greth_regs);
1107}
1108
1109static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1110{
1111 int i;
1112 struct greth_private *greth = netdev_priv(dev);
1113 u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1114 u32 *buff = p;
1115
1116 for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1117 buff[i] = greth_read_bd(&greth_regs[i]);
1118}
1119
1120static u32 greth_get_rx_csum(struct net_device *dev)
1121{
1122 struct greth_private *greth = netdev_priv(dev);
1123 return (greth->flags & GRETH_FLAG_RX_CSUM) != 0;
1124}
1125
1126static int greth_set_rx_csum(struct net_device *dev, u32 data)
1127{
1128 struct greth_private *greth = netdev_priv(dev);
1129
1130 spin_lock_bh(&greth->devlock);
1131
1132 if (data)
1133 greth->flags |= GRETH_FLAG_RX_CSUM;
1134 else
1135 greth->flags &= ~GRETH_FLAG_RX_CSUM;
1136
1137 spin_unlock_bh(&greth->devlock);
1138
1139 return 0;
1140}
1141
1142static u32 greth_get_tx_csum(struct net_device *dev)
1143{
1144 return (dev->features & NETIF_F_IP_CSUM) != 0;
1145}
1146
1147static int greth_set_tx_csum(struct net_device *dev, u32 data)
1148{
1149 netif_tx_lock_bh(dev);
1150 ethtool_op_set_tx_csum(dev, data);
1151 netif_tx_unlock_bh(dev);
1152 return 0;
1153}
1154
1155static const struct ethtool_ops greth_ethtool_ops = {
1156 .get_msglevel = greth_get_msglevel,
1157 .set_msglevel = greth_set_msglevel,
1158 .get_settings = greth_get_settings,
1159 .set_settings = greth_set_settings,
1160 .get_drvinfo = greth_get_drvinfo,
1161 .get_regs_len = greth_get_regs_len,
1162 .get_regs = greth_get_regs,
1163 .get_rx_csum = greth_get_rx_csum,
1164 .set_rx_csum = greth_set_rx_csum,
1165 .get_tx_csum = greth_get_tx_csum,
1166 .set_tx_csum = greth_set_tx_csum,
1167 .get_link = ethtool_op_get_link,
1168};
1169
1170static struct net_device_ops greth_netdev_ops = {
1171 .ndo_open = greth_open,
1172 .ndo_stop = greth_close,
1173 .ndo_start_xmit = greth_start_xmit,
1174 .ndo_set_mac_address = greth_set_mac_add,
kirjanov@gmail.com6e037182010-02-19 05:00:52 +00001175 .ndo_validate_addr = eth_validate_addr,
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001176};
1177
1178static inline int wait_for_mdio(struct greth_private *greth)
1179{
1180 unsigned long timeout = jiffies + 4*HZ/100;
1181 while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1182 if (time_after(jiffies, timeout))
1183 return 0;
1184 }
1185 return 1;
1186}
1187
1188static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1189{
1190 struct greth_private *greth = bus->priv;
1191 int data;
1192
1193 if (!wait_for_mdio(greth))
1194 return -EBUSY;
1195
1196 GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1197
1198 if (!wait_for_mdio(greth))
1199 return -EBUSY;
1200
1201 if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1202 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1203 return data;
1204
1205 } else {
1206 return -1;
1207 }
1208}
1209
1210static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1211{
1212 struct greth_private *greth = bus->priv;
1213
1214 if (!wait_for_mdio(greth))
1215 return -EBUSY;
1216
1217 GRETH_REGSAVE(greth->regs->mdio,
1218 ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1219
1220 if (!wait_for_mdio(greth))
1221 return -EBUSY;
1222
1223 return 0;
1224}
1225
1226static int greth_mdio_reset(struct mii_bus *bus)
1227{
1228 return 0;
1229}
1230
1231static void greth_link_change(struct net_device *dev)
1232{
1233 struct greth_private *greth = netdev_priv(dev);
1234 struct phy_device *phydev = greth->phy;
1235 unsigned long flags;
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001236 int status_change = 0;
Daniel Hellstrom2436af82011-01-14 03:02:41 +00001237 u32 ctrl;
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001238
1239 spin_lock_irqsave(&greth->devlock, flags);
1240
1241 if (phydev->link) {
1242
1243 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
Daniel Hellstrom2436af82011-01-14 03:02:41 +00001244 ctrl = GRETH_REGLOAD(greth->regs->control) &
1245 ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001246
1247 if (phydev->duplex)
Daniel Hellstrom2436af82011-01-14 03:02:41 +00001248 ctrl |= GRETH_CTRL_FD;
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001249
Daniel Hellstrom2436af82011-01-14 03:02:41 +00001250 if (phydev->speed == SPEED_100)
1251 ctrl |= GRETH_CTRL_SP;
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001252 else if (phydev->speed == SPEED_1000)
Daniel Hellstrom2436af82011-01-14 03:02:41 +00001253 ctrl |= GRETH_CTRL_GB;
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001254
Daniel Hellstrom2436af82011-01-14 03:02:41 +00001255 GRETH_REGSAVE(greth->regs->control, ctrl);
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001256 greth->speed = phydev->speed;
1257 greth->duplex = phydev->duplex;
1258 status_change = 1;
1259 }
1260 }
1261
1262 if (phydev->link != greth->link) {
1263 if (!phydev->link) {
1264 greth->speed = 0;
1265 greth->duplex = -1;
1266 }
1267 greth->link = phydev->link;
1268
1269 status_change = 1;
1270 }
1271
1272 spin_unlock_irqrestore(&greth->devlock, flags);
1273
1274 if (status_change) {
1275 if (phydev->link)
1276 pr_debug("%s: link up (%d/%s)\n",
1277 dev->name, phydev->speed,
1278 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1279 else
1280 pr_debug("%s: link down\n", dev->name);
1281 }
1282}
1283
1284static int greth_mdio_probe(struct net_device *dev)
1285{
1286 struct greth_private *greth = netdev_priv(dev);
1287 struct phy_device *phy = NULL;
kirjanov@gmail.com6e037182010-02-19 05:00:52 +00001288 int ret;
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001289
1290 /* Find the first PHY */
kirjanov@gmail.com6e037182010-02-19 05:00:52 +00001291 phy = phy_find_first(greth->mdio);
1292
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001293 if (!phy) {
1294 if (netif_msg_probe(greth))
1295 dev_err(&dev->dev, "no PHY found\n");
1296 return -ENXIO;
1297 }
1298
kirjanov@gmail.com6e037182010-02-19 05:00:52 +00001299 ret = phy_connect_direct(dev, phy, &greth_link_change,
1300 0, greth->gbit_mac ?
1301 PHY_INTERFACE_MODE_GMII :
1302 PHY_INTERFACE_MODE_MII);
1303 if (ret) {
1304 if (netif_msg_ifup(greth))
1305 dev_err(&dev->dev, "could not attach to PHY\n");
1306 return ret;
1307 }
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001308
1309 if (greth->gbit_mac)
1310 phy->supported &= PHY_GBIT_FEATURES;
1311 else
1312 phy->supported &= PHY_BASIC_FEATURES;
1313
1314 phy->advertising = phy->supported;
1315
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001316 greth->link = 0;
1317 greth->speed = 0;
1318 greth->duplex = -1;
1319 greth->phy = phy;
1320
1321 return 0;
1322}
1323
1324static inline int phy_aneg_done(struct phy_device *phydev)
1325{
1326 int retval;
1327
1328 retval = phy_read(phydev, MII_BMSR);
1329
1330 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1331}
1332
1333static int greth_mdio_init(struct greth_private *greth)
1334{
1335 int ret, phy;
1336 unsigned long timeout;
1337
1338 greth->mdio = mdiobus_alloc();
1339 if (!greth->mdio) {
1340 return -ENOMEM;
1341 }
1342
1343 greth->mdio->name = "greth-mdio";
1344 snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1345 greth->mdio->read = greth_mdio_read;
1346 greth->mdio->write = greth_mdio_write;
1347 greth->mdio->reset = greth_mdio_reset;
1348 greth->mdio->priv = greth;
1349
1350 greth->mdio->irq = greth->mdio_irqs;
1351
1352 for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1353 greth->mdio->irq[phy] = PHY_POLL;
1354
1355 ret = mdiobus_register(greth->mdio);
1356 if (ret) {
1357 goto error;
1358 }
1359
1360 ret = greth_mdio_probe(greth->netdev);
1361 if (ret) {
1362 if (netif_msg_probe(greth))
1363 dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1364 goto unreg_mdio;
1365 }
1366
1367 phy_start(greth->phy);
1368
1369 /* If Ethernet debug link is used make autoneg happen right away */
1370 if (greth->edcl && greth_edcl == 1) {
1371 phy_start_aneg(greth->phy);
1372 timeout = jiffies + 6*HZ;
1373 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1374 }
1375 genphy_read_status(greth->phy);
1376 greth_link_change(greth->netdev);
1377 }
1378
1379 return 0;
1380
1381unreg_mdio:
1382 mdiobus_unregister(greth->mdio);
1383error:
1384 mdiobus_free(greth->mdio);
1385 return ret;
1386}
1387
1388/* Initialize the GRETH MAC */
Grant Likely2dc11582010-08-06 09:25:50 -06001389static int __devinit greth_of_probe(struct platform_device *ofdev, const struct of_device_id *match)
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001390{
1391 struct net_device *dev;
1392 struct greth_private *greth;
1393 struct greth_regs *regs;
1394
1395 int i;
1396 int err;
1397 int tmp;
1398 unsigned long timeout;
1399
1400 dev = alloc_etherdev(sizeof(struct greth_private));
1401
1402 if (dev == NULL)
1403 return -ENOMEM;
1404
1405 greth = netdev_priv(dev);
1406 greth->netdev = dev;
1407 greth->dev = &ofdev->dev;
1408
1409 if (greth_debug > 0)
1410 greth->msg_enable = greth_debug;
1411 else
1412 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1413
1414 spin_lock_init(&greth->devlock);
1415
1416 greth->regs = of_ioremap(&ofdev->resource[0], 0,
1417 resource_size(&ofdev->resource[0]),
1418 "grlib-greth regs");
1419
1420 if (greth->regs == NULL) {
1421 if (netif_msg_probe(greth))
1422 dev_err(greth->dev, "ioremap failure.\n");
1423 err = -EIO;
1424 goto error1;
1425 }
1426
1427 regs = (struct greth_regs *) greth->regs;
Grant Likely19e48752010-08-08 00:23:26 -06001428 greth->irq = ofdev->archdata.irqs[0];
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001429
1430 dev_set_drvdata(greth->dev, dev);
1431 SET_NETDEV_DEV(dev, greth->dev);
1432
1433 if (netif_msg_probe(greth))
1434 dev_dbg(greth->dev, "reseting controller.\n");
1435
1436 /* Reset the controller. */
1437 GRETH_REGSAVE(regs->control, GRETH_RESET);
1438
1439 /* Wait for MAC to reset itself */
1440 timeout = jiffies + HZ/100;
1441 while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1442 if (time_after(jiffies, timeout)) {
1443 err = -EIO;
1444 if (netif_msg_probe(greth))
1445 dev_err(greth->dev, "timeout when waiting for reset.\n");
1446 goto error2;
1447 }
1448 }
1449
1450 /* Get default PHY address */
1451 greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1452
1453 /* Check if we have GBIT capable MAC */
1454 tmp = GRETH_REGLOAD(regs->control);
1455 greth->gbit_mac = (tmp >> 27) & 1;
1456
1457 /* Check for multicast capability */
1458 greth->multicast = (tmp >> 25) & 1;
1459
1460 greth->edcl = (tmp >> 31) & 1;
1461
1462 /* If we have EDCL we disable the EDCL speed-duplex FSM so
1463 * it doesn't interfere with the software */
1464 if (greth->edcl != 0)
1465 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1466
1467 /* Check if MAC can handle MDIO interrupts */
1468 greth->mdio_int_en = (tmp >> 26) & 1;
1469
1470 err = greth_mdio_init(greth);
1471 if (err) {
1472 if (netif_msg_probe(greth))
1473 dev_err(greth->dev, "failed to register MDIO bus\n");
1474 goto error2;
1475 }
1476
1477 /* Allocate TX descriptor ring in coherent memory */
1478 greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1479 1024,
1480 &greth->tx_bd_base_phys,
1481 GFP_KERNEL);
1482
1483 if (!greth->tx_bd_base) {
1484 if (netif_msg_probe(greth))
1485 dev_err(&dev->dev, "could not allocate descriptor memory.\n");
1486 err = -ENOMEM;
1487 goto error3;
1488 }
1489
1490 memset(greth->tx_bd_base, 0, 1024);
1491
1492 /* Allocate RX descriptor ring in coherent memory */
1493 greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1494 1024,
1495 &greth->rx_bd_base_phys,
1496 GFP_KERNEL);
1497
1498 if (!greth->rx_bd_base) {
1499 if (netif_msg_probe(greth))
1500 dev_err(greth->dev, "could not allocate descriptor memory.\n");
1501 err = -ENOMEM;
1502 goto error4;
1503 }
1504
1505 memset(greth->rx_bd_base, 0, 1024);
1506
1507 /* Get MAC address from: module param, OF property or ID prom */
1508 for (i = 0; i < 6; i++) {
1509 if (macaddr[i] != 0)
1510 break;
1511 }
1512 if (i == 6) {
1513 const unsigned char *addr;
1514 int len;
Grant Likely61c7a082010-04-13 16:12:29 -07001515 addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1516 &len);
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001517 if (addr != NULL && len == 6) {
1518 for (i = 0; i < 6; i++)
1519 macaddr[i] = (unsigned int) addr[i];
1520 } else {
1521#ifdef CONFIG_SPARC
1522 for (i = 0; i < 6; i++)
1523 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1524#endif
1525 }
1526 }
1527
1528 for (i = 0; i < 6; i++)
1529 dev->dev_addr[i] = macaddr[i];
1530
1531 macaddr[5]++;
1532
1533 if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1534 if (netif_msg_probe(greth))
1535 dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1536 err = -EINVAL;
1537 goto error5;
1538 }
1539
1540 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1541 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1542 dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1543
1544 /* Clear all pending interrupts except PHY irq */
1545 GRETH_REGSAVE(regs->status, 0xFF);
1546
1547 if (greth->gbit_mac) {
1548 dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_HIGHDMA;
1549 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1550 greth->flags = GRETH_FLAG_RX_CSUM;
1551 }
1552
1553 if (greth->multicast) {
1554 greth_netdev_ops.ndo_set_multicast_list = greth_set_multicast_list;
1555 dev->flags |= IFF_MULTICAST;
1556 } else {
1557 dev->flags &= ~IFF_MULTICAST;
1558 }
1559
1560 dev->netdev_ops = &greth_netdev_ops;
1561 dev->ethtool_ops = &greth_ethtool_ops;
1562
Tobias Klausercb5d9912010-08-17 06:11:24 +00001563 err = register_netdev(dev);
1564 if (err) {
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001565 if (netif_msg_probe(greth))
1566 dev_err(greth->dev, "netdevice registration failed.\n");
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001567 goto error5;
1568 }
1569
1570 /* setup NAPI */
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001571 netif_napi_add(dev, &greth->napi, greth_poll, 64);
1572
1573 return 0;
1574
1575error5:
1576 dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1577error4:
1578 dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1579error3:
1580 mdiobus_unregister(greth->mdio);
1581error2:
1582 of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1583error1:
1584 free_netdev(dev);
1585 return err;
1586}
1587
Grant Likely2dc11582010-08-06 09:25:50 -06001588static int __devexit greth_of_remove(struct platform_device *of_dev)
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001589{
1590 struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
1591 struct greth_private *greth = netdev_priv(ndev);
1592
1593 /* Free descriptor areas */
1594 dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1595
1596 dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1597
1598 dev_set_drvdata(&of_dev->dev, NULL);
1599
1600 if (greth->phy)
1601 phy_stop(greth->phy);
1602 mdiobus_unregister(greth->mdio);
1603
1604 unregister_netdev(ndev);
1605 free_netdev(ndev);
1606
1607 of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1608
1609 return 0;
1610}
1611
1612static struct of_device_id greth_of_match[] = {
1613 {
1614 .name = "GAISLER_ETHMAC",
1615 },
Daniel Hellstromad4650a2011-01-14 03:02:37 +00001616 {
1617 .name = "01_01d",
1618 },
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001619 {},
1620};
1621
1622MODULE_DEVICE_TABLE(of, greth_of_match);
1623
1624static struct of_platform_driver greth_of_driver = {
David S. Millerbc284f92010-05-31 05:47:32 -07001625 .driver = {
1626 .name = "grlib-greth",
1627 .owner = THIS_MODULE,
1628 .of_match_table = greth_of_match,
1629 },
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001630 .probe = greth_of_probe,
1631 .remove = __devexit_p(greth_of_remove),
Kristoffer Glembod4c41132010-02-15 03:33:44 +00001632};
1633
1634static int __init greth_init(void)
1635{
1636 return of_register_platform_driver(&greth_of_driver);
1637}
1638
1639static void __exit greth_cleanup(void)
1640{
1641 of_unregister_platform_driver(&greth_of_driver);
1642}
1643
1644module_init(greth_init);
1645module_exit(greth_cleanup);
1646
1647MODULE_AUTHOR("Aeroflex Gaisler AB.");
1648MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1649MODULE_LICENSE("GPL");