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Merge 3.0-rc2 into tty-linus
[linux/fpc-iii.git] / drivers / net / bfin_mac.c
blob68d45ba2d9b9a0844c0c1691a31e07bf7374168b
1 /*
2 * Blackfin On-Chip MAC Driver
3 *
4 * Copyright 2004-2010 Analog Devices Inc.
5 *
6 * Enter bugs at http://blackfin.uclinux.org/
7 *
8 * Licensed under the GPL-2 or later.
9 */
10
11 #define DRV_VERSION "1.1"
12 #define DRV_DESC "Blackfin on-chip Ethernet MAC driver"
13
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16 #include <linux/init.h>
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/slab.h>
21 #include <linux/delay.h>
22 #include <linux/timer.h>
23 #include <linux/errno.h>
24 #include <linux/irq.h>
25 #include <linux/io.h>
26 #include <linux/ioport.h>
27 #include <linux/crc32.h>
28 #include <linux/device.h>
29 #include <linux/spinlock.h>
30 #include <linux/mii.h>
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/ethtool.h>
34 #include <linux/skbuff.h>
35 #include <linux/platform_device.h>
36
37 #include <asm/dma.h>
38 #include <linux/dma-mapping.h>
39
40 #include <asm/div64.h>
41 #include <asm/dpmc.h>
42 #include <asm/blackfin.h>
43 #include <asm/cacheflush.h>
44 #include <asm/portmux.h>
45 #include <mach/pll.h>
46
47 #include "bfin_mac.h"
48
49 MODULE_AUTHOR("Bryan Wu, Luke Yang");
50 MODULE_LICENSE("GPL");
51 MODULE_DESCRIPTION(DRV_DESC);
52 MODULE_ALIAS("platform:bfin_mac");
53
54 #if defined(CONFIG_BFIN_MAC_USE_L1)
55 # define bfin_mac_alloc(dma_handle, size) l1_data_sram_zalloc(size)
56 # define bfin_mac_free(dma_handle, ptr) l1_data_sram_free(ptr)
57 #else
58 # define bfin_mac_alloc(dma_handle, size) \
59 dma_alloc_coherent(NULL, size, dma_handle, GFP_KERNEL)
60 # define bfin_mac_free(dma_handle, ptr) \
61 dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle)
62 #endif
63
64 #define PKT_BUF_SZ 1580
65
66 #define MAX_TIMEOUT_CNT 500
67
68 /* pointers to maintain transmit list */
69 static struct net_dma_desc_tx *tx_list_head;
70 static struct net_dma_desc_tx *tx_list_tail;
71 static struct net_dma_desc_rx *rx_list_head;
72 static struct net_dma_desc_rx *rx_list_tail;
73 static struct net_dma_desc_rx *current_rx_ptr;
74 static struct net_dma_desc_tx *current_tx_ptr;
75 static struct net_dma_desc_tx *tx_desc;
76 static struct net_dma_desc_rx *rx_desc;
77
78 static void desc_list_free(void)
79 {
80 struct net_dma_desc_rx *r;
81 struct net_dma_desc_tx *t;
82 int i;
83 #if !defined(CONFIG_BFIN_MAC_USE_L1)
84 dma_addr_t dma_handle = 0;
85 #endif
86
87 if (tx_desc) {
88 t = tx_list_head;
89 for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
90 if (t) {
91 if (t->skb) {
92 dev_kfree_skb(t->skb);
93 t->skb = NULL;
94 }
95 t = t->next;
96 }
97 }
98 bfin_mac_free(dma_handle, tx_desc);
99 }
100
101 if (rx_desc) {
102 r = rx_list_head;
103 for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
104 if (r) {
105 if (r->skb) {
106 dev_kfree_skb(r->skb);
107 r->skb = NULL;
108 }
109 r = r->next;
110 }
111 }
112 bfin_mac_free(dma_handle, rx_desc);
113 }
114 }
115
116 static int desc_list_init(void)
117 {
118 int i;
119 struct sk_buff *new_skb;
120 #if !defined(CONFIG_BFIN_MAC_USE_L1)
121 /*
122 * This dma_handle is useless in Blackfin dma_alloc_coherent().
123 * The real dma handler is the return value of dma_alloc_coherent().
124 */
125 dma_addr_t dma_handle;
126 #endif
127
128 tx_desc = bfin_mac_alloc(&dma_handle,
129 sizeof(struct net_dma_desc_tx) *
130 CONFIG_BFIN_TX_DESC_NUM);
131 if (tx_desc == NULL)
132 goto init_error;
133
134 rx_desc = bfin_mac_alloc(&dma_handle,
135 sizeof(struct net_dma_desc_rx) *
136 CONFIG_BFIN_RX_DESC_NUM);
137 if (rx_desc == NULL)
138 goto init_error;
139
140 /* init tx_list */
141 tx_list_head = tx_list_tail = tx_desc;
142
143 for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
144 struct net_dma_desc_tx *t = tx_desc + i;
145 struct dma_descriptor *a = &(t->desc_a);
146 struct dma_descriptor *b = &(t->desc_b);
147
148 /*
149 * disable DMA
150 * read from memory WNR = 0
151 * wordsize is 32 bits
152 * 6 half words is desc size
153 * large desc flow
154 */
155 a->config = WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
156 a->start_addr = (unsigned long)t->packet;
157 a->x_count = 0;
158 a->next_dma_desc = b;
159
160 /*
161 * enabled DMA
162 * write to memory WNR = 1
163 * wordsize is 32 bits
164 * disable interrupt
165 * 6 half words is desc size
166 * large desc flow
167 */
168 b->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
169 b->start_addr = (unsigned long)(&(t->status));
170 b->x_count = 0;
171
172 t->skb = NULL;
173 tx_list_tail->desc_b.next_dma_desc = a;
174 tx_list_tail->next = t;
175 tx_list_tail = t;
176 }
177 tx_list_tail->next = tx_list_head; /* tx_list is a circle */
178 tx_list_tail->desc_b.next_dma_desc = &(tx_list_head->desc_a);
179 current_tx_ptr = tx_list_head;
180
181 /* init rx_list */
182 rx_list_head = rx_list_tail = rx_desc;
183
184 for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
185 struct net_dma_desc_rx *r = rx_desc + i;
186 struct dma_descriptor *a = &(r->desc_a);
187 struct dma_descriptor *b = &(r->desc_b);
188
189 /* allocate a new skb for next time receive */
190 new_skb = dev_alloc_skb(PKT_BUF_SZ + NET_IP_ALIGN);
191 if (!new_skb) {
192 pr_notice("init: low on mem - packet dropped\n");
193 goto init_error;
194 }
195 skb_reserve(new_skb, NET_IP_ALIGN);
196 /* Invidate the data cache of skb->data range when it is write back
197 * cache. It will prevent overwritting the new data from DMA
198 */
199 blackfin_dcache_invalidate_range((unsigned long)new_skb->head,
200 (unsigned long)new_skb->end);
201 r->skb = new_skb;
202
203 /*
204 * enabled DMA
205 * write to memory WNR = 1
206 * wordsize is 32 bits
207 * disable interrupt
208 * 6 half words is desc size
209 * large desc flow
210 */
211 a->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
212 /* since RXDWA is enabled */
213 a->start_addr = (unsigned long)new_skb->data - 2;
214 a->x_count = 0;
215 a->next_dma_desc = b;
216
217 /*
218 * enabled DMA
219 * write to memory WNR = 1
220 * wordsize is 32 bits
221 * enable interrupt
222 * 6 half words is desc size
223 * large desc flow
224 */
225 b->config = DMAEN | WNR | WDSIZE_32 | DI_EN |
226 NDSIZE_6 | DMAFLOW_LARGE;
227 b->start_addr = (unsigned long)(&(r->status));
228 b->x_count = 0;
229
230 rx_list_tail->desc_b.next_dma_desc = a;
231 rx_list_tail->next = r;
232 rx_list_tail = r;
233 }
234 rx_list_tail->next = rx_list_head; /* rx_list is a circle */
235 rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a);
236 current_rx_ptr = rx_list_head;
237
238 return 0;
239
240 init_error:
241 desc_list_free();
242 pr_err("kmalloc failed\n");
243 return -ENOMEM;
244 }
245
246
247 /*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/
248
249 /*
250 * MII operations
251 */
252 /* Wait until the previous MDC/MDIO transaction has completed */
253 static int bfin_mdio_poll(void)
254 {
255 int timeout_cnt = MAX_TIMEOUT_CNT;
256
257 /* poll the STABUSY bit */
258 while ((bfin_read_EMAC_STAADD()) & STABUSY) {
259 udelay(1);
260 if (timeout_cnt-- < 0) {
261 pr_err("wait MDC/MDIO transaction to complete timeout\n");
262 return -ETIMEDOUT;
263 }
264 }
265
266 return 0;
267 }
268
269 /* Read an off-chip register in a PHY through the MDC/MDIO port */
270 static int bfin_mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
271 {
272 int ret;
273
274 ret = bfin_mdio_poll();
275 if (ret)
276 return ret;
277
278 /* read mode */
279 bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
280 SET_REGAD((u16) regnum) |
281 STABUSY);
282
283 ret = bfin_mdio_poll();
284 if (ret)
285 return ret;
286
287 return (int) bfin_read_EMAC_STADAT();
288 }
289
290 /* Write an off-chip register in a PHY through the MDC/MDIO port */
291 static int bfin_mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum,
292 u16 value)
293 {
294 int ret;
295
296 ret = bfin_mdio_poll();
297 if (ret)
298 return ret;
299
300 bfin_write_EMAC_STADAT((u32) value);
301
302 /* write mode */
303 bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
304 SET_REGAD((u16) regnum) |
305 STAOP |
306 STABUSY);
307
308 return bfin_mdio_poll();
309 }
310
311 static int bfin_mdiobus_reset(struct mii_bus *bus)
312 {
313 return 0;
314 }
315
316 static void bfin_mac_adjust_link(struct net_device *dev)
317 {
318 struct bfin_mac_local *lp = netdev_priv(dev);
319 struct phy_device *phydev = lp->phydev;
320 unsigned long flags;
321 int new_state = 0;
322
323 spin_lock_irqsave(&lp->lock, flags);
324 if (phydev->link) {
325 /* Now we make sure that we can be in full duplex mode.
326 * If not, we operate in half-duplex mode. */
327 if (phydev->duplex != lp->old_duplex) {
328 u32 opmode = bfin_read_EMAC_OPMODE();
329 new_state = 1;
330
331 if (phydev->duplex)
332 opmode |= FDMODE;
333 else
334 opmode &= ~(FDMODE);
335
336 bfin_write_EMAC_OPMODE(opmode);
337 lp->old_duplex = phydev->duplex;
338 }
339
340 if (phydev->speed != lp->old_speed) {
341 if (phydev->interface == PHY_INTERFACE_MODE_RMII) {
342 u32 opmode = bfin_read_EMAC_OPMODE();
343 switch (phydev->speed) {
344 case 10:
345 opmode |= RMII_10;
346 break;
347 case 100:
348 opmode &= ~RMII_10;
349 break;
350 default:
351 netdev_warn(dev,
352 "Ack! Speed (%d) is not 10/100!\n",
353 phydev->speed);
354 break;
355 }
356 bfin_write_EMAC_OPMODE(opmode);
357 }
358
359 new_state = 1;
360 lp->old_speed = phydev->speed;
361 }
362
363 if (!lp->old_link) {
364 new_state = 1;
365 lp->old_link = 1;
366 }
367 } else if (lp->old_link) {
368 new_state = 1;
369 lp->old_link = 0;
370 lp->old_speed = 0;
371 lp->old_duplex = -1;
372 }
373
374 if (new_state) {
375 u32 opmode = bfin_read_EMAC_OPMODE();
376 phy_print_status(phydev);
377 pr_debug("EMAC_OPMODE = 0x%08x\n", opmode);
378 }
379
380 spin_unlock_irqrestore(&lp->lock, flags);
381 }
382
383 /* MDC = 2.5 MHz */
384 #define MDC_CLK 2500000
385
386 static int mii_probe(struct net_device *dev, int phy_mode)
387 {
388 struct bfin_mac_local *lp = netdev_priv(dev);
389 struct phy_device *phydev = NULL;
390 unsigned short sysctl;
391 int i;
392 u32 sclk, mdc_div;
393
394 /* Enable PHY output early */
395 if (!(bfin_read_VR_CTL() & CLKBUFOE))
396 bfin_write_VR_CTL(bfin_read_VR_CTL() | CLKBUFOE);
397
398 sclk = get_sclk();
399 mdc_div = ((sclk / MDC_CLK) / 2) - 1;
400
401 sysctl = bfin_read_EMAC_SYSCTL();
402 sysctl = (sysctl & ~MDCDIV) | SET_MDCDIV(mdc_div);
403 bfin_write_EMAC_SYSCTL(sysctl);
404
405 /* search for connected PHY device */
406 for (i = 0; i < PHY_MAX_ADDR; ++i) {
407 struct phy_device *const tmp_phydev = lp->mii_bus->phy_map[i];
408
409 if (!tmp_phydev)
410 continue; /* no PHY here... */
411
412 phydev = tmp_phydev;
413 break; /* found it */
414 }
415
416 /* now we are supposed to have a proper phydev, to attach to... */
417 if (!phydev) {
418 netdev_err(dev, "no phy device found\n");
419 return -ENODEV;
420 }
421
422 if (phy_mode != PHY_INTERFACE_MODE_RMII &&
423 phy_mode != PHY_INTERFACE_MODE_MII) {
424 netdev_err(dev, "invalid phy interface mode\n");
425 return -EINVAL;
426 }
427
428 phydev = phy_connect(dev, dev_name(&phydev->dev), &bfin_mac_adjust_link,
429 0, phy_mode);
430
431 if (IS_ERR(phydev)) {
432 netdev_err(dev, "could not attach PHY\n");
433 return PTR_ERR(phydev);
434 }
435
436 /* mask with MAC supported features */
437 phydev->supported &= (SUPPORTED_10baseT_Half
438 | SUPPORTED_10baseT_Full
439 | SUPPORTED_100baseT_Half
440 | SUPPORTED_100baseT_Full
441 | SUPPORTED_Autoneg
442 | SUPPORTED_Pause | SUPPORTED_Asym_Pause
443 | SUPPORTED_MII
444 | SUPPORTED_TP);
445
446 phydev->advertising = phydev->supported;
447
448 lp->old_link = 0;
449 lp->old_speed = 0;
450 lp->old_duplex = -1;
451 lp->phydev = phydev;
452
453 pr_info("attached PHY driver [%s] "
454 "(mii_bus:phy_addr=%s, irq=%d, mdc_clk=%dHz(mdc_div=%d)@sclk=%dMHz)\n",
455 phydev->drv->name, dev_name(&phydev->dev), phydev->irq,
456 MDC_CLK, mdc_div, sclk/1000000);
457
458 return 0;
459 }
460
461 /*
462 * Ethtool support
463 */
464
465 /*
466 * interrupt routine for magic packet wakeup
467 */
468 static irqreturn_t bfin_mac_wake_interrupt(int irq, void *dev_id)
469 {
470 return IRQ_HANDLED;
471 }
472
473 static int
474 bfin_mac_ethtool_getsettings(struct net_device *dev, struct ethtool_cmd *cmd)
475 {
476 struct bfin_mac_local *lp = netdev_priv(dev);
477
478 if (lp->phydev)
479 return phy_ethtool_gset(lp->phydev, cmd);
480
481 return -EINVAL;
482 }
483
484 static int
485 bfin_mac_ethtool_setsettings(struct net_device *dev, struct ethtool_cmd *cmd)
486 {
487 struct bfin_mac_local *lp = netdev_priv(dev);
488
489 if (!capable(CAP_NET_ADMIN))
490 return -EPERM;
491
492 if (lp->phydev)
493 return phy_ethtool_sset(lp->phydev, cmd);
494
495 return -EINVAL;
496 }
497
498 static void bfin_mac_ethtool_getdrvinfo(struct net_device *dev,
499 struct ethtool_drvinfo *info)
500 {
501 strcpy(info->driver, KBUILD_MODNAME);
502 strcpy(info->version, DRV_VERSION);
503 strcpy(info->fw_version, "N/A");
504 strcpy(info->bus_info, dev_name(&dev->dev));
505 }
506
507 static void bfin_mac_ethtool_getwol(struct net_device *dev,
508 struct ethtool_wolinfo *wolinfo)
509 {
510 struct bfin_mac_local *lp = netdev_priv(dev);
511
512 wolinfo->supported = WAKE_MAGIC;
513 wolinfo->wolopts = lp->wol;
514 }
515
516 static int bfin_mac_ethtool_setwol(struct net_device *dev,
517 struct ethtool_wolinfo *wolinfo)
518 {
519 struct bfin_mac_local *lp = netdev_priv(dev);
520 int rc;
521
522 if (wolinfo->wolopts & (WAKE_MAGICSECURE |
523 WAKE_UCAST |
524 WAKE_MCAST |
525 WAKE_BCAST |
526 WAKE_ARP))
527 return -EOPNOTSUPP;
528
529 lp->wol = wolinfo->wolopts;
530
531 if (lp->wol && !lp->irq_wake_requested) {
532 /* register wake irq handler */
533 rc = request_irq(IRQ_MAC_WAKEDET, bfin_mac_wake_interrupt,
534 IRQF_DISABLED, "EMAC_WAKE", dev);
535 if (rc)
536 return rc;
537 lp->irq_wake_requested = true;
538 }
539
540 if (!lp->wol && lp->irq_wake_requested) {
541 free_irq(IRQ_MAC_WAKEDET, dev);
542 lp->irq_wake_requested = false;
543 }
544
545 /* Make sure the PHY driver doesn't suspend */
546 device_init_wakeup(&dev->dev, lp->wol);
547
548 return 0;
549 }
550
551 static const struct ethtool_ops bfin_mac_ethtool_ops = {
552 .get_settings = bfin_mac_ethtool_getsettings,
553 .set_settings = bfin_mac_ethtool_setsettings,
554 .get_link = ethtool_op_get_link,
555 .get_drvinfo = bfin_mac_ethtool_getdrvinfo,
556 .get_wol = bfin_mac_ethtool_getwol,
557 .set_wol = bfin_mac_ethtool_setwol,
558 };
559
560 /**************************************************************************/
561 static void setup_system_regs(struct net_device *dev)
562 {
563 struct bfin_mac_local *lp = netdev_priv(dev);
564 int i;
565 unsigned short sysctl;
566
567 /*
568 * Odd word alignment for Receive Frame DMA word
569 * Configure checksum support and rcve frame word alignment
570 */
571 sysctl = bfin_read_EMAC_SYSCTL();
572 /*
573 * check if interrupt is requested for any PHY,
574 * enable PHY interrupt only if needed
575 */
576 for (i = 0; i < PHY_MAX_ADDR; ++i)
577 if (lp->mii_bus->irq[i] != PHY_POLL)
578 break;
579 if (i < PHY_MAX_ADDR)
580 sysctl |= PHYIE;
581 sysctl |= RXDWA;
582 #if defined(BFIN_MAC_CSUM_OFFLOAD)
583 sysctl |= RXCKS;
584 #else
585 sysctl &= ~RXCKS;
586 #endif
587 bfin_write_EMAC_SYSCTL(sysctl);
588
589 bfin_write_EMAC_MMC_CTL(RSTC | CROLL);
590
591 /* Set vlan regs to let 1522 bytes long packets pass through */
592 bfin_write_EMAC_VLAN1(lp->vlan1_mask);
593 bfin_write_EMAC_VLAN2(lp->vlan2_mask);
594
595 /* Initialize the TX DMA channel registers */
596 bfin_write_DMA2_X_COUNT(0);
597 bfin_write_DMA2_X_MODIFY(4);
598 bfin_write_DMA2_Y_COUNT(0);
599 bfin_write_DMA2_Y_MODIFY(0);
600
601 /* Initialize the RX DMA channel registers */
602 bfin_write_DMA1_X_COUNT(0);
603 bfin_write_DMA1_X_MODIFY(4);
604 bfin_write_DMA1_Y_COUNT(0);
605 bfin_write_DMA1_Y_MODIFY(0);
606 }
607
608 static void setup_mac_addr(u8 *mac_addr)
609 {
610 u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]);
611 u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]);
612
613 /* this depends on a little-endian machine */
614 bfin_write_EMAC_ADDRLO(addr_low);
615 bfin_write_EMAC_ADDRHI(addr_hi);
616 }
617
618 static int bfin_mac_set_mac_address(struct net_device *dev, void *p)
619 {
620 struct sockaddr *addr = p;
621 if (netif_running(dev))
622 return -EBUSY;
623 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
624 setup_mac_addr(dev->dev_addr);
625 return 0;
626 }
627
628 #ifdef CONFIG_BFIN_MAC_USE_HWSTAMP
629 #define bfin_mac_hwtstamp_is_none(cfg) ((cfg) == HWTSTAMP_FILTER_NONE)
630
631 static int bfin_mac_hwtstamp_ioctl(struct net_device *netdev,
632 struct ifreq *ifr, int cmd)
633 {
634 struct hwtstamp_config config;
635 struct bfin_mac_local *lp = netdev_priv(netdev);
636 u16 ptpctl;
637 u32 ptpfv1, ptpfv2, ptpfv3, ptpfoff;
638
639 if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
640 return -EFAULT;
641
642 pr_debug("%s config flag:0x%x, tx_type:0x%x, rx_filter:0x%x\n",
643 __func__, config.flags, config.tx_type, config.rx_filter);
644
645 /* reserved for future extensions */
646 if (config.flags)
647 return -EINVAL;
648
649 if ((config.tx_type != HWTSTAMP_TX_OFF) &&
650 (config.tx_type != HWTSTAMP_TX_ON))
651 return -ERANGE;
652
653 ptpctl = bfin_read_EMAC_PTP_CTL();
654
655 switch (config.rx_filter) {
656 case HWTSTAMP_FILTER_NONE:
657 /*
658 * Dont allow any timestamping
659 */
660 ptpfv3 = 0xFFFFFFFF;
661 bfin_write_EMAC_PTP_FV3(ptpfv3);
662 break;
663 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
664 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
665 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
666 /*
667 * Clear the five comparison mask bits (bits[12:8]) in EMAC_PTP_CTL)
668 * to enable all the field matches.
669 */
670 ptpctl &= ~0x1F00;
671 bfin_write_EMAC_PTP_CTL(ptpctl);
672 /*
673 * Keep the default values of the EMAC_PTP_FOFF register.
674 */
675 ptpfoff = 0x4A24170C;
676 bfin_write_EMAC_PTP_FOFF(ptpfoff);
677 /*
678 * Keep the default values of the EMAC_PTP_FV1 and EMAC_PTP_FV2
679 * registers.
680 */
681 ptpfv1 = 0x11040800;
682 bfin_write_EMAC_PTP_FV1(ptpfv1);
683 ptpfv2 = 0x0140013F;
684 bfin_write_EMAC_PTP_FV2(ptpfv2);
685 /*
686 * The default value (0xFFFC) allows the timestamping of both
687 * received Sync messages and Delay_Req messages.
688 */
689 ptpfv3 = 0xFFFFFFFC;
690 bfin_write_EMAC_PTP_FV3(ptpfv3);
691
692 config.rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
693 break;
694 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
695 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
696 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
697 /* Clear all five comparison mask bits (bits[12:8]) in the
698 * EMAC_PTP_CTL register to enable all the field matches.
699 */
700 ptpctl &= ~0x1F00;
701 bfin_write_EMAC_PTP_CTL(ptpctl);
702 /*
703 * Keep the default values of the EMAC_PTP_FOFF register, except set
704 * the PTPCOF field to 0x2A.
705 */
706 ptpfoff = 0x2A24170C;
707 bfin_write_EMAC_PTP_FOFF(ptpfoff);
708 /*
709 * Keep the default values of the EMAC_PTP_FV1 and EMAC_PTP_FV2
710 * registers.
711 */
712 ptpfv1 = 0x11040800;
713 bfin_write_EMAC_PTP_FV1(ptpfv1);
714 ptpfv2 = 0x0140013F;
715 bfin_write_EMAC_PTP_FV2(ptpfv2);
716 /*
717 * To allow the timestamping of Pdelay_Req and Pdelay_Resp, set
718 * the value to 0xFFF0.
719 */
720 ptpfv3 = 0xFFFFFFF0;
721 bfin_write_EMAC_PTP_FV3(ptpfv3);
722
723 config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
724 break;
725 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
726 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
727 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
728 /*
729 * Clear bits 8 and 12 of the EMAC_PTP_CTL register to enable only the
730 * EFTM and PTPCM field comparison.
731 */
732 ptpctl &= ~0x1100;
733 bfin_write_EMAC_PTP_CTL(ptpctl);
734 /*
735 * Keep the default values of all the fields of the EMAC_PTP_FOFF
736 * register, except set the PTPCOF field to 0x0E.
737 */
738 ptpfoff = 0x0E24170C;
739 bfin_write_EMAC_PTP_FOFF(ptpfoff);
740 /*
741 * Program bits [15:0] of the EMAC_PTP_FV1 register to 0x88F7, which
742 * corresponds to PTP messages on the MAC layer.
743 */
744 ptpfv1 = 0x110488F7;
745 bfin_write_EMAC_PTP_FV1(ptpfv1);
746 ptpfv2 = 0x0140013F;
747 bfin_write_EMAC_PTP_FV2(ptpfv2);
748 /*
749 * To allow the timestamping of Pdelay_Req and Pdelay_Resp
750 * messages, set the value to 0xFFF0.
751 */
752 ptpfv3 = 0xFFFFFFF0;
753 bfin_write_EMAC_PTP_FV3(ptpfv3);
754
755 config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
756 break;
757 default:
758 return -ERANGE;
759 }
760
761 if (config.tx_type == HWTSTAMP_TX_OFF &&
762 bfin_mac_hwtstamp_is_none(config.rx_filter)) {
763 ptpctl &= ~PTP_EN;
764 bfin_write_EMAC_PTP_CTL(ptpctl);
765
766 SSYNC();
767 } else {
768 ptpctl |= PTP_EN;
769 bfin_write_EMAC_PTP_CTL(ptpctl);
770
771 /*
772 * clear any existing timestamp
773 */
774 bfin_read_EMAC_PTP_RXSNAPLO();
775 bfin_read_EMAC_PTP_RXSNAPHI();
776
777 bfin_read_EMAC_PTP_TXSNAPLO();
778 bfin_read_EMAC_PTP_TXSNAPHI();
779
780 /*
781 * Set registers so that rollover occurs soon to test this.
782 */
783 bfin_write_EMAC_PTP_TIMELO(0x00000000);
784 bfin_write_EMAC_PTP_TIMEHI(0xFF800000);
785
786 SSYNC();
787
788 lp->compare.last_update = 0;
789 timecounter_init(&lp->clock,
790 &lp->cycles,
791 ktime_to_ns(ktime_get_real()));
792 timecompare_update(&lp->compare, 0);
793 }
794
795 lp->stamp_cfg = config;
796 return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
797 -EFAULT : 0;
798 }
799
800 static void bfin_dump_hwtamp(char *s, ktime_t *hw, ktime_t *ts, struct timecompare *cmp)
801 {
802 ktime_t sys = ktime_get_real();
803
804 pr_debug("%s %s hardware:%d,%d transform system:%d,%d system:%d,%d, cmp:%lld, %lld\n",
805 __func__, s, hw->tv.sec, hw->tv.nsec, ts->tv.sec, ts->tv.nsec, sys.tv.sec,
806 sys.tv.nsec, cmp->offset, cmp->skew);
807 }
808
809 static void bfin_tx_hwtstamp(struct net_device *netdev, struct sk_buff *skb)
810 {
811 struct bfin_mac_local *lp = netdev_priv(netdev);
812
813 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
814 int timeout_cnt = MAX_TIMEOUT_CNT;
815
816 /* When doing time stamping, keep the connection to the socket
817 * a while longer
818 */
819 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
820
821 /*
822 * The timestamping is done at the EMAC module's MII/RMII interface
823 * when the module sees the Start of Frame of an event message packet. This
824 * interface is the closest possible place to the physical Ethernet transmission
825 * medium, providing the best timing accuracy.
826 */
827 while ((!(bfin_read_EMAC_PTP_ISTAT() & TXTL)) && (--timeout_cnt))
828 udelay(1);
829 if (timeout_cnt == 0)
830 netdev_err(netdev, "timestamp the TX packet failed\n");
831 else {
832 struct skb_shared_hwtstamps shhwtstamps;
833 u64 ns;
834 u64 regval;
835
836 regval = bfin_read_EMAC_PTP_TXSNAPLO();
837 regval |= (u64)bfin_read_EMAC_PTP_TXSNAPHI() << 32;
838 memset(&shhwtstamps, 0, sizeof(shhwtstamps));
839 ns = timecounter_cyc2time(&lp->clock,
840 regval);
841 timecompare_update(&lp->compare, ns);
842 shhwtstamps.hwtstamp = ns_to_ktime(ns);
843 shhwtstamps.syststamp =
844 timecompare_transform(&lp->compare, ns);
845 skb_tstamp_tx(skb, &shhwtstamps);
846
847 bfin_dump_hwtamp("TX", &shhwtstamps.hwtstamp, &shhwtstamps.syststamp, &lp->compare);
848 }
849 }
850 }
851
852 static void bfin_rx_hwtstamp(struct net_device *netdev, struct sk_buff *skb)
853 {
854 struct bfin_mac_local *lp = netdev_priv(netdev);
855 u32 valid;
856 u64 regval, ns;
857 struct skb_shared_hwtstamps *shhwtstamps;
858
859 if (bfin_mac_hwtstamp_is_none(lp->stamp_cfg.rx_filter))
860 return;
861
862 valid = bfin_read_EMAC_PTP_ISTAT() & RXEL;
863 if (!valid)
864 return;
865
866 shhwtstamps = skb_hwtstamps(skb);
867
868 regval = bfin_read_EMAC_PTP_RXSNAPLO();
869 regval |= (u64)bfin_read_EMAC_PTP_RXSNAPHI() << 32;
870 ns = timecounter_cyc2time(&lp->clock, regval);
871 timecompare_update(&lp->compare, ns);
872 memset(shhwtstamps, 0, sizeof(*shhwtstamps));
873 shhwtstamps->hwtstamp = ns_to_ktime(ns);
874 shhwtstamps->syststamp = timecompare_transform(&lp->compare, ns);
875
876 bfin_dump_hwtamp("RX", &shhwtstamps->hwtstamp, &shhwtstamps->syststamp, &lp->compare);
877 }
878
879 /*
880 * bfin_read_clock - read raw cycle counter (to be used by time counter)
881 */
882 static cycle_t bfin_read_clock(const struct cyclecounter *tc)
883 {
884 u64 stamp;
885
886 stamp = bfin_read_EMAC_PTP_TIMELO();
887 stamp |= (u64)bfin_read_EMAC_PTP_TIMEHI() << 32ULL;
888
889 return stamp;
890 }
891
892 #define PTP_CLK 25000000
893
894 static void bfin_mac_hwtstamp_init(struct net_device *netdev)
895 {
896 struct bfin_mac_local *lp = netdev_priv(netdev);
897 u64 append;
898
899 /* Initialize hardware timer */
900 append = PTP_CLK * (1ULL << 32);
901 do_div(append, get_sclk());
902 bfin_write_EMAC_PTP_ADDEND((u32)append);
903
904 memset(&lp->cycles, 0, sizeof(lp->cycles));
905 lp->cycles.read = bfin_read_clock;
906 lp->cycles.mask = CLOCKSOURCE_MASK(64);
907 lp->cycles.mult = 1000000000 / PTP_CLK;
908 lp->cycles.shift = 0;
909
910 /* Synchronize our NIC clock against system wall clock */
911 memset(&lp->compare, 0, sizeof(lp->compare));
912 lp->compare.source = &lp->clock;
913 lp->compare.target = ktime_get_real;
914 lp->compare.num_samples = 10;
915
916 /* Initialize hwstamp config */
917 lp->stamp_cfg.rx_filter = HWTSTAMP_FILTER_NONE;
918 lp->stamp_cfg.tx_type = HWTSTAMP_TX_OFF;
919 }
920
921 #else
922 # define bfin_mac_hwtstamp_is_none(cfg) 0
923 # define bfin_mac_hwtstamp_init(dev)
924 # define bfin_mac_hwtstamp_ioctl(dev, ifr, cmd) (-EOPNOTSUPP)
925 # define bfin_rx_hwtstamp(dev, skb)
926 # define bfin_tx_hwtstamp(dev, skb)
927 #endif
928
929 static inline void _tx_reclaim_skb(void)
930 {
931 do {
932 tx_list_head->desc_a.config &= ~DMAEN;
933 tx_list_head->status.status_word = 0;
934 if (tx_list_head->skb) {
935 dev_kfree_skb(tx_list_head->skb);
936 tx_list_head->skb = NULL;
937 }
938 tx_list_head = tx_list_head->next;
939
940 } while (tx_list_head->status.status_word != 0);
941 }
942
943 static void tx_reclaim_skb(struct bfin_mac_local *lp)
944 {
945 int timeout_cnt = MAX_TIMEOUT_CNT;
946
947 if (tx_list_head->status.status_word != 0)
948 _tx_reclaim_skb();
949
950 if (current_tx_ptr->next == tx_list_head) {
951 while (tx_list_head->status.status_word == 0) {
952 /* slow down polling to avoid too many queue stop. */
953 udelay(10);
954 /* reclaim skb if DMA is not running. */
955 if (!(bfin_read_DMA2_IRQ_STATUS() & DMA_RUN))
956 break;
957 if (timeout_cnt-- < 0)
958 break;
959 }
960
961 if (timeout_cnt >= 0)
962 _tx_reclaim_skb();
963 else
964 netif_stop_queue(lp->ndev);
965 }
966
967 if (current_tx_ptr->next != tx_list_head &&
968 netif_queue_stopped(lp->ndev))
969 netif_wake_queue(lp->ndev);
970
971 if (tx_list_head != current_tx_ptr) {
972 /* shorten the timer interval if tx queue is stopped */
973 if (netif_queue_stopped(lp->ndev))
974 lp->tx_reclaim_timer.expires =
975 jiffies + (TX_RECLAIM_JIFFIES >> 4);
976 else
977 lp->tx_reclaim_timer.expires =
978 jiffies + TX_RECLAIM_JIFFIES;
979
980 mod_timer(&lp->tx_reclaim_timer,
981 lp->tx_reclaim_timer.expires);
982 }
983
984 return;
985 }
986
987 static void tx_reclaim_skb_timeout(unsigned long lp)
988 {
989 tx_reclaim_skb((struct bfin_mac_local *)lp);
990 }
991
992 static int bfin_mac_hard_start_xmit(struct sk_buff *skb,
993 struct net_device *dev)
994 {
995 struct bfin_mac_local *lp = netdev_priv(dev);
996 u16 *data;
997 u32 data_align = (unsigned long)(skb->data) & 0x3;
998
999 current_tx_ptr->skb = skb;
1000
1001 if (data_align == 0x2) {
1002 /* move skb->data to current_tx_ptr payload */
1003 data = (u16 *)(skb->data) - 1;
1004 *data = (u16)(skb->len);
1005 /*
1006 * When transmitting an Ethernet packet, the PTP_TSYNC module requires
1007 * a DMA_Length_Word field associated with the packet. The lower 12 bits
1008 * of this field are the length of the packet payload in bytes and the higher
1009 * 4 bits are the timestamping enable field.
1010 */
1011 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)
1012 *data |= 0x1000;
1013
1014 current_tx_ptr->desc_a.start_addr = (u32)data;
1015 /* this is important! */
1016 blackfin_dcache_flush_range((u32)data,
1017 (u32)((u8 *)data + skb->len + 4));
1018 } else {
1019 *((u16 *)(current_tx_ptr->packet)) = (u16)(skb->len);
1020 /* enable timestamping for the sent packet */
1021 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)
1022 *((u16 *)(current_tx_ptr->packet)) |= 0x1000;
1023 memcpy((u8 *)(current_tx_ptr->packet + 2), skb->data,
1024 skb->len);
1025 current_tx_ptr->desc_a.start_addr =
1026 (u32)current_tx_ptr->packet;
1027 blackfin_dcache_flush_range(
1028 (u32)current_tx_ptr->packet,
1029 (u32)(current_tx_ptr->packet + skb->len + 2));
1030 }
1031
1032 /* make sure the internal data buffers in the core are drained
1033 * so that the DMA descriptors are completely written when the
1034 * DMA engine goes to fetch them below
1035 */
1036 SSYNC();
1037
1038 /* always clear status buffer before start tx dma */
1039 current_tx_ptr->status.status_word = 0;
1040
1041 /* enable this packet's dma */
1042 current_tx_ptr->desc_a.config |= DMAEN;
1043
1044 /* tx dma is running, just return */
1045 if (bfin_read_DMA2_IRQ_STATUS() & DMA_RUN)
1046 goto out;
1047
1048 /* tx dma is not running */
1049 bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
1050 /* dma enabled, read from memory, size is 6 */
1051 bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config);
1052 /* Turn on the EMAC tx */
1053 bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
1054
1055 out:
1056 bfin_tx_hwtstamp(dev, skb);
1057
1058 current_tx_ptr = current_tx_ptr->next;
1059 dev->stats.tx_packets++;
1060 dev->stats.tx_bytes += (skb->len);
1061
1062 tx_reclaim_skb(lp);
1063
1064 return NETDEV_TX_OK;
1065 }
1066
1067 #define IP_HEADER_OFF 0
1068 #define RX_ERROR_MASK (RX_LONG | RX_ALIGN | RX_CRC | RX_LEN | \
1069 RX_FRAG | RX_ADDR | RX_DMAO | RX_PHY | RX_LATE | RX_RANGE)
1070
1071 static void bfin_mac_rx(struct net_device *dev)
1072 {
1073 struct sk_buff *skb, *new_skb;
1074 unsigned short len;
1075 struct bfin_mac_local *lp __maybe_unused = netdev_priv(dev);
1076 #if defined(BFIN_MAC_CSUM_OFFLOAD)
1077 unsigned int i;
1078 unsigned char fcs[ETH_FCS_LEN + 1];
1079 #endif
1080
1081 /* check if frame status word reports an error condition
1082 * we which case we simply drop the packet
1083 */
1084 if (current_rx_ptr->status.status_word & RX_ERROR_MASK) {
1085 netdev_notice(dev, "rx: receive error - packet dropped\n");
1086 dev->stats.rx_dropped++;
1087 goto out;
1088 }
1089
1090 /* allocate a new skb for next time receive */
1091 skb = current_rx_ptr->skb;
1092
1093 new_skb = dev_alloc_skb(PKT_BUF_SZ + NET_IP_ALIGN);
1094 if (!new_skb) {
1095 netdev_notice(dev, "rx: low on mem - packet dropped\n");
1096 dev->stats.rx_dropped++;
1097 goto out;
1098 }
1099 /* reserve 2 bytes for RXDWA padding */
1100 skb_reserve(new_skb, NET_IP_ALIGN);
1101 /* Invidate the data cache of skb->data range when it is write back
1102 * cache. It will prevent overwritting the new data from DMA
1103 */
1104 blackfin_dcache_invalidate_range((unsigned long)new_skb->head,
1105 (unsigned long)new_skb->end);
1106
1107 current_rx_ptr->skb = new_skb;
1108 current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
1109
1110 len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
1111 /* Deduce Ethernet FCS length from Ethernet payload length */
1112 len -= ETH_FCS_LEN;
1113 skb_put(skb, len);
1114
1115 skb->protocol = eth_type_trans(skb, dev);
1116
1117 bfin_rx_hwtstamp(dev, skb);
1118
1119 #if defined(BFIN_MAC_CSUM_OFFLOAD)
1120 /* Checksum offloading only works for IPv4 packets with the standard IP header
1121 * length of 20 bytes, because the blackfin MAC checksum calculation is
1122 * based on that assumption. We must NOT use the calculated checksum if our
1123 * IP version or header break that assumption.
1124 */
1125 if (skb->data[IP_HEADER_OFF] == 0x45) {
1126 skb->csum = current_rx_ptr->status.ip_payload_csum;
1127 /*
1128 * Deduce Ethernet FCS from hardware generated IP payload checksum.
1129 * IP checksum is based on 16-bit one's complement algorithm.
1130 * To deduce a value from checksum is equal to add its inversion.
1131 * If the IP payload len is odd, the inversed FCS should also
1132 * begin from odd address and leave first byte zero.
1133 */
1134 if (skb->len % 2) {
1135 fcs[0] = 0;
1136 for (i = 0; i < ETH_FCS_LEN; i++)
1137 fcs[i + 1] = ~skb->data[skb->len + i];
1138 skb->csum = csum_partial(fcs, ETH_FCS_LEN + 1, skb->csum);
1139 } else {
1140 for (i = 0; i < ETH_FCS_LEN; i++)
1141 fcs[i] = ~skb->data[skb->len + i];
1142 skb->csum = csum_partial(fcs, ETH_FCS_LEN, skb->csum);
1143 }
1144 skb->ip_summed = CHECKSUM_COMPLETE;
1145 }
1146 #endif
1147
1148 netif_rx(skb);
1149 dev->stats.rx_packets++;
1150 dev->stats.rx_bytes += len;
1151 out:
1152 current_rx_ptr->status.status_word = 0x00000000;
1153 current_rx_ptr = current_rx_ptr->next;
1154 }
1155
1156 /* interrupt routine to handle rx and error signal */
1157 static irqreturn_t bfin_mac_interrupt(int irq, void *dev_id)
1158 {
1159 struct net_device *dev = dev_id;
1160 int number = 0;
1161
1162 get_one_packet:
1163 if (current_rx_ptr->status.status_word == 0) {
1164 /* no more new packet received */
1165 if (number == 0) {
1166 if (current_rx_ptr->next->status.status_word != 0) {
1167 current_rx_ptr = current_rx_ptr->next;
1168 goto real_rx;
1169 }
1170 }
1171 bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
1172 DMA_DONE | DMA_ERR);
1173 return IRQ_HANDLED;
1174 }
1175
1176 real_rx:
1177 bfin_mac_rx(dev);
1178 number++;
1179 goto get_one_packet;
1180 }
1181
1182 #ifdef CONFIG_NET_POLL_CONTROLLER
1183 static void bfin_mac_poll(struct net_device *dev)
1184 {
1185 struct bfin_mac_local *lp = netdev_priv(dev);
1186
1187 disable_irq(IRQ_MAC_RX);
1188 bfin_mac_interrupt(IRQ_MAC_RX, dev);
1189 tx_reclaim_skb(lp);
1190 enable_irq(IRQ_MAC_RX);
1191 }
1192 #endif /* CONFIG_NET_POLL_CONTROLLER */
1193
1194 static void bfin_mac_disable(void)
1195 {
1196 unsigned int opmode;
1197
1198 opmode = bfin_read_EMAC_OPMODE();
1199 opmode &= (~RE);
1200 opmode &= (~TE);
1201 /* Turn off the EMAC */
1202 bfin_write_EMAC_OPMODE(opmode);
1203 }
1204
1205 /*
1206 * Enable Interrupts, Receive, and Transmit
1207 */
1208 static int bfin_mac_enable(struct phy_device *phydev)
1209 {
1210 int ret;
1211 u32 opmode;
1212
1213 pr_debug("%s\n", __func__);
1214
1215 /* Set RX DMA */
1216 bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
1217 bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config);
1218
1219 /* Wait MII done */
1220 ret = bfin_mdio_poll();
1221 if (ret)
1222 return ret;
1223
1224 /* We enable only RX here */
1225 /* ASTP : Enable Automatic Pad Stripping
1226 PR : Promiscuous Mode for test
1227 PSF : Receive frames with total length less than 64 bytes.
1228 FDMODE : Full Duplex Mode
1229 LB : Internal Loopback for test
1230 RE : Receiver Enable */
1231 opmode = bfin_read_EMAC_OPMODE();
1232 if (opmode & FDMODE)
1233 opmode |= PSF;
1234 else
1235 opmode |= DRO | DC | PSF;
1236 opmode |= RE;
1237
1238 if (phydev->interface == PHY_INTERFACE_MODE_RMII) {
1239 opmode |= RMII; /* For Now only 100MBit are supported */
1240 #if defined(CONFIG_BF537) || defined(CONFIG_BF536)
1241 if (__SILICON_REVISION__ < 3) {
1242 /*
1243 * This isn't publicly documented (fun times!), but in
1244 * silicon <=0.2, the RX and TX pins are clocked together.
1245 * So in order to recv, we must enable the transmit side
1246 * as well. This will cause a spurious TX interrupt too,
1247 * but we can easily consume that.
1248 */
1249 opmode |= TE;
1250 }
1251 #endif
1252 }
1253
1254 /* Turn on the EMAC rx */
1255 bfin_write_EMAC_OPMODE(opmode);
1256
1257 return 0;
1258 }
1259
1260 /* Our watchdog timed out. Called by the networking layer */
1261 static void bfin_mac_timeout(struct net_device *dev)
1262 {
1263 struct bfin_mac_local *lp = netdev_priv(dev);
1264
1265 pr_debug("%s: %s\n", dev->name, __func__);
1266
1267 bfin_mac_disable();
1268
1269 del_timer(&lp->tx_reclaim_timer);
1270
1271 /* reset tx queue and free skb */
1272 while (tx_list_head != current_tx_ptr) {
1273 tx_list_head->desc_a.config &= ~DMAEN;
1274 tx_list_head->status.status_word = 0;
1275 if (tx_list_head->skb) {
1276 dev_kfree_skb(tx_list_head->skb);
1277 tx_list_head->skb = NULL;
1278 }
1279 tx_list_head = tx_list_head->next;
1280 }
1281
1282 if (netif_queue_stopped(lp->ndev))
1283 netif_wake_queue(lp->ndev);
1284
1285 bfin_mac_enable(lp->phydev);
1286
1287 /* We can accept TX packets again */
1288 dev->trans_start = jiffies; /* prevent tx timeout */
1289 netif_wake_queue(dev);
1290 }
1291
1292 static void bfin_mac_multicast_hash(struct net_device *dev)
1293 {
1294 u32 emac_hashhi, emac_hashlo;
1295 struct netdev_hw_addr *ha;
1296 u32 crc;
1297
1298 emac_hashhi = emac_hashlo = 0;
1299
1300 netdev_for_each_mc_addr(ha, dev) {
1301 crc = ether_crc(ETH_ALEN, ha->addr);
1302 crc >>= 26;
1303
1304 if (crc & 0x20)
1305 emac_hashhi |= 1 << (crc & 0x1f);
1306 else
1307 emac_hashlo |= 1 << (crc & 0x1f);
1308 }
1309
1310 bfin_write_EMAC_HASHHI(emac_hashhi);
1311 bfin_write_EMAC_HASHLO(emac_hashlo);
1312 }
1313
1314 /*
1315 * This routine will, depending on the values passed to it,
1316 * either make it accept multicast packets, go into
1317 * promiscuous mode (for TCPDUMP and cousins) or accept
1318 * a select set of multicast packets
1319 */
1320 static void bfin_mac_set_multicast_list(struct net_device *dev)
1321 {
1322 u32 sysctl;
1323
1324 if (dev->flags & IFF_PROMISC) {
1325 netdev_info(dev, "set promisc mode\n");
1326 sysctl = bfin_read_EMAC_OPMODE();
1327 sysctl |= PR;
1328 bfin_write_EMAC_OPMODE(sysctl);
1329 } else if (dev->flags & IFF_ALLMULTI) {
1330 /* accept all multicast */
1331 sysctl = bfin_read_EMAC_OPMODE();
1332 sysctl |= PAM;
1333 bfin_write_EMAC_OPMODE(sysctl);
1334 } else if (!netdev_mc_empty(dev)) {
1335 /* set up multicast hash table */
1336 sysctl = bfin_read_EMAC_OPMODE();
1337 sysctl |= HM;
1338 bfin_write_EMAC_OPMODE(sysctl);
1339 bfin_mac_multicast_hash(dev);
1340 } else {
1341 /* clear promisc or multicast mode */
1342 sysctl = bfin_read_EMAC_OPMODE();
1343 sysctl &= ~(RAF | PAM);
1344 bfin_write_EMAC_OPMODE(sysctl);
1345 }
1346 }
1347
1348 static int bfin_mac_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
1349 {
1350 struct bfin_mac_local *lp = netdev_priv(netdev);
1351
1352 if (!netif_running(netdev))
1353 return -EINVAL;
1354
1355 switch (cmd) {
1356 case SIOCSHWTSTAMP:
1357 return bfin_mac_hwtstamp_ioctl(netdev, ifr, cmd);
1358 default:
1359 if (lp->phydev)
1360 return phy_mii_ioctl(lp->phydev, ifr, cmd);
1361 else
1362 return -EOPNOTSUPP;
1363 }
1364 }
1365
1366 /*
1367 * this puts the device in an inactive state
1368 */
1369 static void bfin_mac_shutdown(struct net_device *dev)
1370 {
1371 /* Turn off the EMAC */
1372 bfin_write_EMAC_OPMODE(0x00000000);
1373 /* Turn off the EMAC RX DMA */
1374 bfin_write_DMA1_CONFIG(0x0000);
1375 bfin_write_DMA2_CONFIG(0x0000);
1376 }
1377
1378 /*
1379 * Open and Initialize the interface
1380 *
1381 * Set up everything, reset the card, etc..
1382 */
1383 static int bfin_mac_open(struct net_device *dev)
1384 {
1385 struct bfin_mac_local *lp = netdev_priv(dev);
1386 int ret;
1387 pr_debug("%s: %s\n", dev->name, __func__);
1388
1389 /*
1390 * Check that the address is valid. If its not, refuse
1391 * to bring the device up. The user must specify an
1392 * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
1393 */
1394 if (!is_valid_ether_addr(dev->dev_addr)) {
1395 netdev_warn(dev, "no valid ethernet hw addr\n");
1396 return -EINVAL;
1397 }
1398
1399 /* initial rx and tx list */
1400 ret = desc_list_init();
1401 if (ret)
1402 return ret;
1403
1404 phy_start(lp->phydev);
1405 phy_write(lp->phydev, MII_BMCR, BMCR_RESET);
1406 setup_system_regs(dev);
1407 setup_mac_addr(dev->dev_addr);
1408
1409 bfin_mac_disable();
1410 ret = bfin_mac_enable(lp->phydev);
1411 if (ret)
1412 return ret;
1413 pr_debug("hardware init finished\n");
1414
1415 netif_start_queue(dev);
1416 netif_carrier_on(dev);
1417
1418 return 0;
1419 }
1420
1421 /*
1422 * this makes the board clean up everything that it can
1423 * and not talk to the outside world. Caused by
1424 * an 'ifconfig ethX down'
1425 */
1426 static int bfin_mac_close(struct net_device *dev)
1427 {
1428 struct bfin_mac_local *lp = netdev_priv(dev);
1429 pr_debug("%s: %s\n", dev->name, __func__);
1430
1431 netif_stop_queue(dev);
1432 netif_carrier_off(dev);
1433
1434 phy_stop(lp->phydev);
1435 phy_write(lp->phydev, MII_BMCR, BMCR_PDOWN);
1436
1437 /* clear everything */
1438 bfin_mac_shutdown(dev);
1439
1440 /* free the rx/tx buffers */
1441 desc_list_free();
1442
1443 return 0;
1444 }
1445
1446 static const struct net_device_ops bfin_mac_netdev_ops = {
1447 .ndo_open = bfin_mac_open,
1448 .ndo_stop = bfin_mac_close,
1449 .ndo_start_xmit = bfin_mac_hard_start_xmit,
1450 .ndo_set_mac_address = bfin_mac_set_mac_address,
1451 .ndo_tx_timeout = bfin_mac_timeout,
1452 .ndo_set_multicast_list = bfin_mac_set_multicast_list,
1453 .ndo_do_ioctl = bfin_mac_ioctl,
1454 .ndo_validate_addr = eth_validate_addr,
1455 .ndo_change_mtu = eth_change_mtu,
1456 #ifdef CONFIG_NET_POLL_CONTROLLER
1457 .ndo_poll_controller = bfin_mac_poll,
1458 #endif
1459 };
1460
1461 static int __devinit bfin_mac_probe(struct platform_device *pdev)
1462 {
1463 struct net_device *ndev;
1464 struct bfin_mac_local *lp;
1465 struct platform_device *pd;
1466 struct bfin_mii_bus_platform_data *mii_bus_data;
1467 int rc;
1468
1469 ndev = alloc_etherdev(sizeof(struct bfin_mac_local));
1470 if (!ndev) {
1471 dev_err(&pdev->dev, "Cannot allocate net device!\n");
1472 return -ENOMEM;
1473 }
1474
1475 SET_NETDEV_DEV(ndev, &pdev->dev);
1476 platform_set_drvdata(pdev, ndev);
1477 lp = netdev_priv(ndev);
1478 lp->ndev = ndev;
1479
1480 /* Grab the MAC address in the MAC */
1481 *(__le32 *) (&(ndev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
1482 *(__le16 *) (&(ndev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());
1483
1484 /* probe mac */
1485 /*todo: how to proble? which is revision_register */
1486 bfin_write_EMAC_ADDRLO(0x12345678);
1487 if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
1488 dev_err(&pdev->dev, "Cannot detect Blackfin on-chip ethernet MAC controller!\n");
1489 rc = -ENODEV;
1490 goto out_err_probe_mac;
1491 }
1492
1493
1494 /*
1495 * Is it valid? (Did bootloader initialize it?)
1496 * Grab the MAC from the board somehow
1497 * this is done in the arch/blackfin/mach-bfxxx/boards/eth_mac.c
1498 */
1499 if (!is_valid_ether_addr(ndev->dev_addr))
1500 bfin_get_ether_addr(ndev->dev_addr);
1501
1502 /* If still not valid, get a random one */
1503 if (!is_valid_ether_addr(ndev->dev_addr))
1504 random_ether_addr(ndev->dev_addr);
1505
1506 setup_mac_addr(ndev->dev_addr);
1507
1508 if (!pdev->dev.platform_data) {
1509 dev_err(&pdev->dev, "Cannot get platform device bfin_mii_bus!\n");
1510 rc = -ENODEV;
1511 goto out_err_probe_mac;
1512 }
1513 pd = pdev->dev.platform_data;
1514 lp->mii_bus = platform_get_drvdata(pd);
1515 if (!lp->mii_bus) {
1516 dev_err(&pdev->dev, "Cannot get mii_bus!\n");
1517 rc = -ENODEV;
1518 goto out_err_probe_mac;
1519 }
1520 lp->mii_bus->priv = ndev;
1521 mii_bus_data = pd->dev.platform_data;
1522
1523 rc = mii_probe(ndev, mii_bus_data->phy_mode);
1524 if (rc) {
1525 dev_err(&pdev->dev, "MII Probe failed!\n");
1526 goto out_err_mii_probe;
1527 }
1528
1529 lp->vlan1_mask = ETH_P_8021Q | mii_bus_data->vlan1_mask;
1530 lp->vlan2_mask = ETH_P_8021Q | mii_bus_data->vlan2_mask;
1531
1532 /* Fill in the fields of the device structure with ethernet values. */
1533 ether_setup(ndev);
1534
1535 ndev->netdev_ops = &bfin_mac_netdev_ops;
1536 ndev->ethtool_ops = &bfin_mac_ethtool_ops;
1537
1538 init_timer(&lp->tx_reclaim_timer);
1539 lp->tx_reclaim_timer.data = (unsigned long)lp;
1540 lp->tx_reclaim_timer.function = tx_reclaim_skb_timeout;
1541
1542 spin_lock_init(&lp->lock);
1543
1544 /* now, enable interrupts */
1545 /* register irq handler */
1546 rc = request_irq(IRQ_MAC_RX, bfin_mac_interrupt,
1547 IRQF_DISABLED, "EMAC_RX", ndev);
1548 if (rc) {
1549 dev_err(&pdev->dev, "Cannot request Blackfin MAC RX IRQ!\n");
1550 rc = -EBUSY;
1551 goto out_err_request_irq;
1552 }
1553
1554 rc = register_netdev(ndev);
1555 if (rc) {
1556 dev_err(&pdev->dev, "Cannot register net device!\n");
1557 goto out_err_reg_ndev;
1558 }
1559
1560 bfin_mac_hwtstamp_init(ndev);
1561
1562 /* now, print out the card info, in a short format.. */
1563 netdev_info(ndev, "%s, Version %s\n", DRV_DESC, DRV_VERSION);
1564
1565 return 0;
1566
1567 out_err_reg_ndev:
1568 free_irq(IRQ_MAC_RX, ndev);
1569 out_err_request_irq:
1570 out_err_mii_probe:
1571 mdiobus_unregister(lp->mii_bus);
1572 mdiobus_free(lp->mii_bus);
1573 out_err_probe_mac:
1574 platform_set_drvdata(pdev, NULL);
1575 free_netdev(ndev);
1576
1577 return rc;
1578 }
1579
1580 static int __devexit bfin_mac_remove(struct platform_device *pdev)
1581 {
1582 struct net_device *ndev = platform_get_drvdata(pdev);
1583 struct bfin_mac_local *lp = netdev_priv(ndev);
1584
1585 platform_set_drvdata(pdev, NULL);
1586
1587 lp->mii_bus->priv = NULL;
1588
1589 unregister_netdev(ndev);
1590
1591 free_irq(IRQ_MAC_RX, ndev);
1592
1593 free_netdev(ndev);
1594
1595 return 0;
1596 }
1597
1598 #ifdef CONFIG_PM
1599 static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t mesg)
1600 {
1601 struct net_device *net_dev = platform_get_drvdata(pdev);
1602 struct bfin_mac_local *lp = netdev_priv(net_dev);
1603
1604 if (lp->wol) {
1605 bfin_write_EMAC_OPMODE((bfin_read_EMAC_OPMODE() & ~TE) | RE);
1606 bfin_write_EMAC_WKUP_CTL(MPKE);
1607 enable_irq_wake(IRQ_MAC_WAKEDET);
1608 } else {
1609 if (netif_running(net_dev))
1610 bfin_mac_close(net_dev);
1611 }
1612
1613 return 0;
1614 }
1615
1616 static int bfin_mac_resume(struct platform_device *pdev)
1617 {
1618 struct net_device *net_dev = platform_get_drvdata(pdev);
1619 struct bfin_mac_local *lp = netdev_priv(net_dev);
1620
1621 if (lp->wol) {
1622 bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
1623 bfin_write_EMAC_WKUP_CTL(0);
1624 disable_irq_wake(IRQ_MAC_WAKEDET);
1625 } else {
1626 if (netif_running(net_dev))
1627 bfin_mac_open(net_dev);
1628 }
1629
1630 return 0;
1631 }
1632 #else
1633 #define bfin_mac_suspend NULL
1634 #define bfin_mac_resume NULL
1635 #endif /* CONFIG_PM */
1636
1637 static int __devinit bfin_mii_bus_probe(struct platform_device *pdev)
1638 {
1639 struct mii_bus *miibus;
1640 struct bfin_mii_bus_platform_data *mii_bus_pd;
1641 const unsigned short *pin_req;
1642 int rc, i;
1643
1644 mii_bus_pd = dev_get_platdata(&pdev->dev);
1645 if (!mii_bus_pd) {
1646 dev_err(&pdev->dev, "No peripherals in platform data!\n");
1647 return -EINVAL;
1648 }
1649
1650 /*
1651 * We are setting up a network card,
1652 * so set the GPIO pins to Ethernet mode
1653 */
1654 pin_req = mii_bus_pd->mac_peripherals;
1655 rc = peripheral_request_list(pin_req, KBUILD_MODNAME);
1656 if (rc) {
1657 dev_err(&pdev->dev, "Requesting peripherals failed!\n");
1658 return rc;
1659 }
1660
1661 rc = -ENOMEM;
1662 miibus = mdiobus_alloc();
1663 if (miibus == NULL)
1664 goto out_err_alloc;
1665 miibus->read = bfin_mdiobus_read;
1666 miibus->write = bfin_mdiobus_write;
1667 miibus->reset = bfin_mdiobus_reset;
1668
1669 miibus->parent = &pdev->dev;
1670 miibus->name = "bfin_mii_bus";
1671 miibus->phy_mask = mii_bus_pd->phy_mask;
1672
1673 snprintf(miibus->id, MII_BUS_ID_SIZE, "0");
1674 miibus->irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
1675 if (!miibus->irq)
1676 goto out_err_irq_alloc;
1677
1678 for (i = rc; i < PHY_MAX_ADDR; ++i)
1679 miibus->irq[i] = PHY_POLL;
1680
1681 rc = clamp(mii_bus_pd->phydev_number, 0, PHY_MAX_ADDR);
1682 if (rc != mii_bus_pd->phydev_number)
1683 dev_err(&pdev->dev, "Invalid number (%i) of phydevs\n",
1684 mii_bus_pd->phydev_number);
1685 for (i = 0; i < rc; ++i) {
1686 unsigned short phyaddr = mii_bus_pd->phydev_data[i].addr;
1687 if (phyaddr < PHY_MAX_ADDR)
1688 miibus->irq[phyaddr] = mii_bus_pd->phydev_data[i].irq;
1689 else
1690 dev_err(&pdev->dev,
1691 "Invalid PHY address %i for phydev %i\n",
1692 phyaddr, i);
1693 }
1694
1695 rc = mdiobus_register(miibus);
1696 if (rc) {
1697 dev_err(&pdev->dev, "Cannot register MDIO bus!\n");
1698 goto out_err_mdiobus_register;
1699 }
1700
1701 platform_set_drvdata(pdev, miibus);
1702 return 0;
1703
1704 out_err_mdiobus_register:
1705 kfree(miibus->irq);
1706 out_err_irq_alloc:
1707 mdiobus_free(miibus);
1708 out_err_alloc:
1709 peripheral_free_list(pin_req);
1710
1711 return rc;
1712 }
1713
1714 static int __devexit bfin_mii_bus_remove(struct platform_device *pdev)
1715 {
1716 struct mii_bus *miibus = platform_get_drvdata(pdev);
1717 struct bfin_mii_bus_platform_data *mii_bus_pd =
1718 dev_get_platdata(&pdev->dev);
1719
1720 platform_set_drvdata(pdev, NULL);
1721 mdiobus_unregister(miibus);
1722 kfree(miibus->irq);
1723 mdiobus_free(miibus);
1724 peripheral_free_list(mii_bus_pd->mac_peripherals);
1725
1726 return 0;
1727 }
1728
1729 static struct platform_driver bfin_mii_bus_driver = {
1730 .probe = bfin_mii_bus_probe,
1731 .remove = __devexit_p(bfin_mii_bus_remove),
1732 .driver = {
1733 .name = "bfin_mii_bus",
1734 .owner = THIS_MODULE,
1735 },
1736 };
1737
1738 static struct platform_driver bfin_mac_driver = {
1739 .probe = bfin_mac_probe,
1740 .remove = __devexit_p(bfin_mac_remove),
1741 .resume = bfin_mac_resume,
1742 .suspend = bfin_mac_suspend,
1743 .driver = {
1744 .name = KBUILD_MODNAME,
1745 .owner = THIS_MODULE,
1746 },
1747 };
1748
1749 static int __init bfin_mac_init(void)
1750 {
1751 int ret;
1752 ret = platform_driver_register(&bfin_mii_bus_driver);
1753 if (!ret)
1754 return platform_driver_register(&bfin_mac_driver);
1755 return -ENODEV;
1756 }
1757
1758 module_init(bfin_mac_init);
1759
1760 static void __exit bfin_mac_cleanup(void)
1761 {
1762 platform_driver_unregister(&bfin_mac_driver);
1763 platform_driver_unregister(&bfin_mii_bus_driver);
1764 }
1765
1766 module_exit(bfin_mac_cleanup);
1767
Linux with added FPC-III support