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Linux 3.4.102
[linux/fpc-iii.git] / drivers / net / ethernet / adi / bfin_mac.c
blobab4daeccdf98a58eb4c5d849c77e09dd2a13b6c8
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, num) l1_data_sram_zalloc(size*num)
56 # define bfin_mac_free(dma_handle, ptr, num) l1_data_sram_free(ptr)
57 #else
58 # define bfin_mac_alloc(dma_handle, size, num) \
59 dma_alloc_coherent(NULL, size*num, dma_handle, GFP_KERNEL)
60 # define bfin_mac_free(dma_handle, ptr, num) \
61 dma_free_coherent(NULL, sizeof(*ptr)*num, 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, CONFIG_BFIN_TX_DESC_NUM);
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, CONFIG_BFIN_RX_DESC_NUM);
113 }
114 }
115
116 static int desc_list_init(struct net_device *dev)
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 = netdev_alloc_skb(dev, 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 dev->addr_assign_type &= ~NET_ADDR_RANDOM;
625 setup_mac_addr(dev->dev_addr);
626 return 0;
627 }
628
629 #ifdef CONFIG_BFIN_MAC_USE_HWSTAMP
630 #define bfin_mac_hwtstamp_is_none(cfg) ((cfg) == HWTSTAMP_FILTER_NONE)
631
632 static int bfin_mac_hwtstamp_ioctl(struct net_device *netdev,
633 struct ifreq *ifr, int cmd)
634 {
635 struct hwtstamp_config config;
636 struct bfin_mac_local *lp = netdev_priv(netdev);
637 u16 ptpctl;
638 u32 ptpfv1, ptpfv2, ptpfv3, ptpfoff;
639
640 if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
641 return -EFAULT;
642
643 pr_debug("%s config flag:0x%x, tx_type:0x%x, rx_filter:0x%x\n",
644 __func__, config.flags, config.tx_type, config.rx_filter);
645
646 /* reserved for future extensions */
647 if (config.flags)
648 return -EINVAL;
649
650 if ((config.tx_type != HWTSTAMP_TX_OFF) &&
651 (config.tx_type != HWTSTAMP_TX_ON))
652 return -ERANGE;
653
654 ptpctl = bfin_read_EMAC_PTP_CTL();
655
656 switch (config.rx_filter) {
657 case HWTSTAMP_FILTER_NONE:
658 /*
659 * Dont allow any timestamping
660 */
661 ptpfv3 = 0xFFFFFFFF;
662 bfin_write_EMAC_PTP_FV3(ptpfv3);
663 break;
664 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
665 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
666 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
667 /*
668 * Clear the five comparison mask bits (bits[12:8]) in EMAC_PTP_CTL)
669 * to enable all the field matches.
670 */
671 ptpctl &= ~0x1F00;
672 bfin_write_EMAC_PTP_CTL(ptpctl);
673 /*
674 * Keep the default values of the EMAC_PTP_FOFF register.
675 */
676 ptpfoff = 0x4A24170C;
677 bfin_write_EMAC_PTP_FOFF(ptpfoff);
678 /*
679 * Keep the default values of the EMAC_PTP_FV1 and EMAC_PTP_FV2
680 * registers.
681 */
682 ptpfv1 = 0x11040800;
683 bfin_write_EMAC_PTP_FV1(ptpfv1);
684 ptpfv2 = 0x0140013F;
685 bfin_write_EMAC_PTP_FV2(ptpfv2);
686 /*
687 * The default value (0xFFFC) allows the timestamping of both
688 * received Sync messages and Delay_Req messages.
689 */
690 ptpfv3 = 0xFFFFFFFC;
691 bfin_write_EMAC_PTP_FV3(ptpfv3);
692
693 config.rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
694 break;
695 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
696 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
697 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
698 /* Clear all five comparison mask bits (bits[12:8]) in the
699 * EMAC_PTP_CTL register to enable all the field matches.
700 */
701 ptpctl &= ~0x1F00;
702 bfin_write_EMAC_PTP_CTL(ptpctl);
703 /*
704 * Keep the default values of the EMAC_PTP_FOFF register, except set
705 * the PTPCOF field to 0x2A.
706 */
707 ptpfoff = 0x2A24170C;
708 bfin_write_EMAC_PTP_FOFF(ptpfoff);
709 /*
710 * Keep the default values of the EMAC_PTP_FV1 and EMAC_PTP_FV2
711 * registers.
712 */
713 ptpfv1 = 0x11040800;
714 bfin_write_EMAC_PTP_FV1(ptpfv1);
715 ptpfv2 = 0x0140013F;
716 bfin_write_EMAC_PTP_FV2(ptpfv2);
717 /*
718 * To allow the timestamping of Pdelay_Req and Pdelay_Resp, set
719 * the value to 0xFFF0.
720 */
721 ptpfv3 = 0xFFFFFFF0;
722 bfin_write_EMAC_PTP_FV3(ptpfv3);
723
724 config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
725 break;
726 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
727 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
728 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
729 /*
730 * Clear bits 8 and 12 of the EMAC_PTP_CTL register to enable only the
731 * EFTM and PTPCM field comparison.
732 */
733 ptpctl &= ~0x1100;
734 bfin_write_EMAC_PTP_CTL(ptpctl);
735 /*
736 * Keep the default values of all the fields of the EMAC_PTP_FOFF
737 * register, except set the PTPCOF field to 0x0E.
738 */
739 ptpfoff = 0x0E24170C;
740 bfin_write_EMAC_PTP_FOFF(ptpfoff);
741 /*
742 * Program bits [15:0] of the EMAC_PTP_FV1 register to 0x88F7, which
743 * corresponds to PTP messages on the MAC layer.
744 */
745 ptpfv1 = 0x110488F7;
746 bfin_write_EMAC_PTP_FV1(ptpfv1);
747 ptpfv2 = 0x0140013F;
748 bfin_write_EMAC_PTP_FV2(ptpfv2);
749 /*
750 * To allow the timestamping of Pdelay_Req and Pdelay_Resp
751 * messages, set the value to 0xFFF0.
752 */
753 ptpfv3 = 0xFFFFFFF0;
754 bfin_write_EMAC_PTP_FV3(ptpfv3);
755
756 config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
757 break;
758 default:
759 return -ERANGE;
760 }
761
762 if (config.tx_type == HWTSTAMP_TX_OFF &&
763 bfin_mac_hwtstamp_is_none(config.rx_filter)) {
764 ptpctl &= ~PTP_EN;
765 bfin_write_EMAC_PTP_CTL(ptpctl);
766
767 SSYNC();
768 } else {
769 ptpctl |= PTP_EN;
770 bfin_write_EMAC_PTP_CTL(ptpctl);
771
772 /*
773 * clear any existing timestamp
774 */
775 bfin_read_EMAC_PTP_RXSNAPLO();
776 bfin_read_EMAC_PTP_RXSNAPHI();
777
778 bfin_read_EMAC_PTP_TXSNAPLO();
779 bfin_read_EMAC_PTP_TXSNAPHI();
780
781 /*
782 * Set registers so that rollover occurs soon to test this.
783 */
784 bfin_write_EMAC_PTP_TIMELO(0x00000000);
785 bfin_write_EMAC_PTP_TIMEHI(0xFF800000);
786
787 SSYNC();
788
789 lp->compare.last_update = 0;
790 timecounter_init(&lp->clock,
791 &lp->cycles,
792 ktime_to_ns(ktime_get_real()));
793 timecompare_update(&lp->compare, 0);
794 }
795
796 lp->stamp_cfg = config;
797 return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
798 -EFAULT : 0;
799 }
800
801 static void bfin_dump_hwtamp(char *s, ktime_t *hw, ktime_t *ts, struct timecompare *cmp)
802 {
803 ktime_t sys = ktime_get_real();
804
805 pr_debug("%s %s hardware:%d,%d transform system:%d,%d system:%d,%d, cmp:%lld, %lld\n",
806 __func__, s, hw->tv.sec, hw->tv.nsec, ts->tv.sec, ts->tv.nsec, sys.tv.sec,
807 sys.tv.nsec, cmp->offset, cmp->skew);
808 }
809
810 static void bfin_tx_hwtstamp(struct net_device *netdev, struct sk_buff *skb)
811 {
812 struct bfin_mac_local *lp = netdev_priv(netdev);
813
814 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
815 int timeout_cnt = MAX_TIMEOUT_CNT;
816
817 /* When doing time stamping, keep the connection to the socket
818 * a while longer
819 */
820 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
821
822 /*
823 * The timestamping is done at the EMAC module's MII/RMII interface
824 * when the module sees the Start of Frame of an event message packet. This
825 * interface is the closest possible place to the physical Ethernet transmission
826 * medium, providing the best timing accuracy.
827 */
828 while ((!(bfin_read_EMAC_PTP_ISTAT() & TXTL)) && (--timeout_cnt))
829 udelay(1);
830 if (timeout_cnt == 0)
831 netdev_err(netdev, "timestamp the TX packet failed\n");
832 else {
833 struct skb_shared_hwtstamps shhwtstamps;
834 u64 ns;
835 u64 regval;
836
837 regval = bfin_read_EMAC_PTP_TXSNAPLO();
838 regval |= (u64)bfin_read_EMAC_PTP_TXSNAPHI() << 32;
839 memset(&shhwtstamps, 0, sizeof(shhwtstamps));
840 ns = timecounter_cyc2time(&lp->clock,
841 regval);
842 timecompare_update(&lp->compare, ns);
843 shhwtstamps.hwtstamp = ns_to_ktime(ns);
844 shhwtstamps.syststamp =
845 timecompare_transform(&lp->compare, ns);
846 skb_tstamp_tx(skb, &shhwtstamps);
847
848 bfin_dump_hwtamp("TX", &shhwtstamps.hwtstamp, &shhwtstamps.syststamp, &lp->compare);
849 }
850 }
851 }
852
853 static void bfin_rx_hwtstamp(struct net_device *netdev, struct sk_buff *skb)
854 {
855 struct bfin_mac_local *lp = netdev_priv(netdev);
856 u32 valid;
857 u64 regval, ns;
858 struct skb_shared_hwtstamps *shhwtstamps;
859
860 if (bfin_mac_hwtstamp_is_none(lp->stamp_cfg.rx_filter))
861 return;
862
863 valid = bfin_read_EMAC_PTP_ISTAT() & RXEL;
864 if (!valid)
865 return;
866
867 shhwtstamps = skb_hwtstamps(skb);
868
869 regval = bfin_read_EMAC_PTP_RXSNAPLO();
870 regval |= (u64)bfin_read_EMAC_PTP_RXSNAPHI() << 32;
871 ns = timecounter_cyc2time(&lp->clock, regval);
872 timecompare_update(&lp->compare, ns);
873 memset(shhwtstamps, 0, sizeof(*shhwtstamps));
874 shhwtstamps->hwtstamp = ns_to_ktime(ns);
875 shhwtstamps->syststamp = timecompare_transform(&lp->compare, ns);
876
877 bfin_dump_hwtamp("RX", &shhwtstamps->hwtstamp, &shhwtstamps->syststamp, &lp->compare);
878 }
879
880 /*
881 * bfin_read_clock - read raw cycle counter (to be used by time counter)
882 */
883 static cycle_t bfin_read_clock(const struct cyclecounter *tc)
884 {
885 u64 stamp;
886
887 stamp = bfin_read_EMAC_PTP_TIMELO();
888 stamp |= (u64)bfin_read_EMAC_PTP_TIMEHI() << 32ULL;
889
890 return stamp;
891 }
892
893 #define PTP_CLK 25000000
894
895 static void bfin_mac_hwtstamp_init(struct net_device *netdev)
896 {
897 struct bfin_mac_local *lp = netdev_priv(netdev);
898 u64 append;
899
900 /* Initialize hardware timer */
901 append = PTP_CLK * (1ULL << 32);
902 do_div(append, get_sclk());
903 bfin_write_EMAC_PTP_ADDEND((u32)append);
904
905 memset(&lp->cycles, 0, sizeof(lp->cycles));
906 lp->cycles.read = bfin_read_clock;
907 lp->cycles.mask = CLOCKSOURCE_MASK(64);
908 lp->cycles.mult = 1000000000 / PTP_CLK;
909 lp->cycles.shift = 0;
910
911 /* Synchronize our NIC clock against system wall clock */
912 memset(&lp->compare, 0, sizeof(lp->compare));
913 lp->compare.source = &lp->clock;
914 lp->compare.target = ktime_get_real;
915 lp->compare.num_samples = 10;
916
917 /* Initialize hwstamp config */
918 lp->stamp_cfg.rx_filter = HWTSTAMP_FILTER_NONE;
919 lp->stamp_cfg.tx_type = HWTSTAMP_TX_OFF;
920 }
921
922 #else
923 # define bfin_mac_hwtstamp_is_none(cfg) 0
924 # define bfin_mac_hwtstamp_init(dev)
925 # define bfin_mac_hwtstamp_ioctl(dev, ifr, cmd) (-EOPNOTSUPP)
926 # define bfin_rx_hwtstamp(dev, skb)
927 # define bfin_tx_hwtstamp(dev, skb)
928 #endif
929
930 static inline void _tx_reclaim_skb(void)
931 {
932 do {
933 tx_list_head->desc_a.config &= ~DMAEN;
934 tx_list_head->status.status_word = 0;
935 if (tx_list_head->skb) {
936 dev_kfree_skb(tx_list_head->skb);
937 tx_list_head->skb = NULL;
938 }
939 tx_list_head = tx_list_head->next;
940
941 } while (tx_list_head->status.status_word != 0);
942 }
943
944 static void tx_reclaim_skb(struct bfin_mac_local *lp)
945 {
946 int timeout_cnt = MAX_TIMEOUT_CNT;
947
948 if (tx_list_head->status.status_word != 0)
949 _tx_reclaim_skb();
950
951 if (current_tx_ptr->next == tx_list_head) {
952 while (tx_list_head->status.status_word == 0) {
953 /* slow down polling to avoid too many queue stop. */
954 udelay(10);
955 /* reclaim skb if DMA is not running. */
956 if (!(bfin_read_DMA2_IRQ_STATUS() & DMA_RUN))
957 break;
958 if (timeout_cnt-- < 0)
959 break;
960 }
961
962 if (timeout_cnt >= 0)
963 _tx_reclaim_skb();
964 else
965 netif_stop_queue(lp->ndev);
966 }
967
968 if (current_tx_ptr->next != tx_list_head &&
969 netif_queue_stopped(lp->ndev))
970 netif_wake_queue(lp->ndev);
971
972 if (tx_list_head != current_tx_ptr) {
973 /* shorten the timer interval if tx queue is stopped */
974 if (netif_queue_stopped(lp->ndev))
975 lp->tx_reclaim_timer.expires =
976 jiffies + (TX_RECLAIM_JIFFIES >> 4);
977 else
978 lp->tx_reclaim_timer.expires =
979 jiffies + TX_RECLAIM_JIFFIES;
980
981 mod_timer(&lp->tx_reclaim_timer,
982 lp->tx_reclaim_timer.expires);
983 }
984
985 return;
986 }
987
988 static void tx_reclaim_skb_timeout(unsigned long lp)
989 {
990 tx_reclaim_skb((struct bfin_mac_local *)lp);
991 }
992
993 static int bfin_mac_hard_start_xmit(struct sk_buff *skb,
994 struct net_device *dev)
995 {
996 struct bfin_mac_local *lp = netdev_priv(dev);
997 u16 *data;
998 u32 data_align = (unsigned long)(skb->data) & 0x3;
999
1000 current_tx_ptr->skb = skb;
1001
1002 if (data_align == 0x2) {
1003 /* move skb->data to current_tx_ptr payload */
1004 data = (u16 *)(skb->data) - 1;
1005 *data = (u16)(skb->len);
1006 /*
1007 * When transmitting an Ethernet packet, the PTP_TSYNC module requires
1008 * a DMA_Length_Word field associated with the packet. The lower 12 bits
1009 * of this field are the length of the packet payload in bytes and the higher
1010 * 4 bits are the timestamping enable field.
1011 */
1012 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)
1013 *data |= 0x1000;
1014
1015 current_tx_ptr->desc_a.start_addr = (u32)data;
1016 /* this is important! */
1017 blackfin_dcache_flush_range((u32)data,
1018 (u32)((u8 *)data + skb->len + 4));
1019 } else {
1020 *((u16 *)(current_tx_ptr->packet)) = (u16)(skb->len);
1021 /* enable timestamping for the sent packet */
1022 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)
1023 *((u16 *)(current_tx_ptr->packet)) |= 0x1000;
1024 memcpy((u8 *)(current_tx_ptr->packet + 2), skb->data,
1025 skb->len);
1026 current_tx_ptr->desc_a.start_addr =
1027 (u32)current_tx_ptr->packet;
1028 blackfin_dcache_flush_range(
1029 (u32)current_tx_ptr->packet,
1030 (u32)(current_tx_ptr->packet + skb->len + 2));
1031 }
1032
1033 /* make sure the internal data buffers in the core are drained
1034 * so that the DMA descriptors are completely written when the
1035 * DMA engine goes to fetch them below
1036 */
1037 SSYNC();
1038
1039 /* always clear status buffer before start tx dma */
1040 current_tx_ptr->status.status_word = 0;
1041
1042 /* enable this packet's dma */
1043 current_tx_ptr->desc_a.config |= DMAEN;
1044
1045 /* tx dma is running, just return */
1046 if (bfin_read_DMA2_IRQ_STATUS() & DMA_RUN)
1047 goto out;
1048
1049 /* tx dma is not running */
1050 bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
1051 /* dma enabled, read from memory, size is 6 */
1052 bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config);
1053 /* Turn on the EMAC tx */
1054 bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
1055
1056 out:
1057 bfin_tx_hwtstamp(dev, skb);
1058
1059 current_tx_ptr = current_tx_ptr->next;
1060 dev->stats.tx_packets++;
1061 dev->stats.tx_bytes += (skb->len);
1062
1063 tx_reclaim_skb(lp);
1064
1065 return NETDEV_TX_OK;
1066 }
1067
1068 #define IP_HEADER_OFF 0
1069 #define RX_ERROR_MASK (RX_LONG | RX_ALIGN | RX_CRC | RX_LEN | \
1070 RX_FRAG | RX_ADDR | RX_DMAO | RX_PHY | RX_LATE | RX_RANGE)
1071
1072 static void bfin_mac_rx(struct net_device *dev)
1073 {
1074 struct sk_buff *skb, *new_skb;
1075 unsigned short len;
1076 struct bfin_mac_local *lp __maybe_unused = netdev_priv(dev);
1077 #if defined(BFIN_MAC_CSUM_OFFLOAD)
1078 unsigned int i;
1079 unsigned char fcs[ETH_FCS_LEN + 1];
1080 #endif
1081
1082 /* check if frame status word reports an error condition
1083 * we which case we simply drop the packet
1084 */
1085 if (current_rx_ptr->status.status_word & RX_ERROR_MASK) {
1086 netdev_notice(dev, "rx: receive error - packet dropped\n");
1087 dev->stats.rx_dropped++;
1088 goto out;
1089 }
1090
1091 /* allocate a new skb for next time receive */
1092 skb = current_rx_ptr->skb;
1093
1094 new_skb = netdev_alloc_skb(dev, PKT_BUF_SZ + NET_IP_ALIGN);
1095 if (!new_skb) {
1096 netdev_notice(dev, "rx: low on mem - packet dropped\n");
1097 dev->stats.rx_dropped++;
1098 goto out;
1099 }
1100 /* reserve 2 bytes for RXDWA padding */
1101 skb_reserve(new_skb, NET_IP_ALIGN);
1102 /* Invidate the data cache of skb->data range when it is write back
1103 * cache. It will prevent overwritting the new data from DMA
1104 */
1105 blackfin_dcache_invalidate_range((unsigned long)new_skb->head,
1106 (unsigned long)new_skb->end);
1107
1108 current_rx_ptr->skb = new_skb;
1109 current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
1110
1111 len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
1112 /* Deduce Ethernet FCS length from Ethernet payload length */
1113 len -= ETH_FCS_LEN;
1114 skb_put(skb, len);
1115
1116 skb->protocol = eth_type_trans(skb, dev);
1117
1118 bfin_rx_hwtstamp(dev, skb);
1119
1120 #if defined(BFIN_MAC_CSUM_OFFLOAD)
1121 /* Checksum offloading only works for IPv4 packets with the standard IP header
1122 * length of 20 bytes, because the blackfin MAC checksum calculation is
1123 * based on that assumption. We must NOT use the calculated checksum if our
1124 * IP version or header break that assumption.
1125 */
1126 if (skb->data[IP_HEADER_OFF] == 0x45) {
1127 skb->csum = current_rx_ptr->status.ip_payload_csum;
1128 /*
1129 * Deduce Ethernet FCS from hardware generated IP payload checksum.
1130 * IP checksum is based on 16-bit one's complement algorithm.
1131 * To deduce a value from checksum is equal to add its inversion.
1132 * If the IP payload len is odd, the inversed FCS should also
1133 * begin from odd address and leave first byte zero.
1134 */
1135 if (skb->len % 2) {
1136 fcs[0] = 0;
1137 for (i = 0; i < ETH_FCS_LEN; i++)
1138 fcs[i + 1] = ~skb->data[skb->len + i];
1139 skb->csum = csum_partial(fcs, ETH_FCS_LEN + 1, skb->csum);
1140 } else {
1141 for (i = 0; i < ETH_FCS_LEN; i++)
1142 fcs[i] = ~skb->data[skb->len + i];
1143 skb->csum = csum_partial(fcs, ETH_FCS_LEN, skb->csum);
1144 }
1145 skb->ip_summed = CHECKSUM_COMPLETE;
1146 }
1147 #endif
1148
1149 netif_rx(skb);
1150 dev->stats.rx_packets++;
1151 dev->stats.rx_bytes += len;
1152 out:
1153 current_rx_ptr->status.status_word = 0x00000000;
1154 current_rx_ptr = current_rx_ptr->next;
1155 }
1156
1157 /* interrupt routine to handle rx and error signal */
1158 static irqreturn_t bfin_mac_interrupt(int irq, void *dev_id)
1159 {
1160 struct net_device *dev = dev_id;
1161 int number = 0;
1162
1163 get_one_packet:
1164 if (current_rx_ptr->status.status_word == 0) {
1165 /* no more new packet received */
1166 if (number == 0) {
1167 if (current_rx_ptr->next->status.status_word != 0) {
1168 current_rx_ptr = current_rx_ptr->next;
1169 goto real_rx;
1170 }
1171 }
1172 bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
1173 DMA_DONE | DMA_ERR);
1174 return IRQ_HANDLED;
1175 }
1176
1177 real_rx:
1178 bfin_mac_rx(dev);
1179 number++;
1180 goto get_one_packet;
1181 }
1182
1183 #ifdef CONFIG_NET_POLL_CONTROLLER
1184 static void bfin_mac_poll(struct net_device *dev)
1185 {
1186 struct bfin_mac_local *lp = netdev_priv(dev);
1187
1188 disable_irq(IRQ_MAC_RX);
1189 bfin_mac_interrupt(IRQ_MAC_RX, dev);
1190 tx_reclaim_skb(lp);
1191 enable_irq(IRQ_MAC_RX);
1192 }
1193 #endif /* CONFIG_NET_POLL_CONTROLLER */
1194
1195 static void bfin_mac_disable(void)
1196 {
1197 unsigned int opmode;
1198
1199 opmode = bfin_read_EMAC_OPMODE();
1200 opmode &= (~RE);
1201 opmode &= (~TE);
1202 /* Turn off the EMAC */
1203 bfin_write_EMAC_OPMODE(opmode);
1204 }
1205
1206 /*
1207 * Enable Interrupts, Receive, and Transmit
1208 */
1209 static int bfin_mac_enable(struct phy_device *phydev)
1210 {
1211 int ret;
1212 u32 opmode;
1213
1214 pr_debug("%s\n", __func__);
1215
1216 /* Set RX DMA */
1217 bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
1218 bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config);
1219
1220 /* Wait MII done */
1221 ret = bfin_mdio_poll();
1222 if (ret)
1223 return ret;
1224
1225 /* We enable only RX here */
1226 /* ASTP : Enable Automatic Pad Stripping
1227 PR : Promiscuous Mode for test
1228 PSF : Receive frames with total length less than 64 bytes.
1229 FDMODE : Full Duplex Mode
1230 LB : Internal Loopback for test
1231 RE : Receiver Enable */
1232 opmode = bfin_read_EMAC_OPMODE();
1233 if (opmode & FDMODE)
1234 opmode |= PSF;
1235 else
1236 opmode |= DRO | DC | PSF;
1237 opmode |= RE;
1238
1239 if (phydev->interface == PHY_INTERFACE_MODE_RMII) {
1240 opmode |= RMII; /* For Now only 100MBit are supported */
1241 #if defined(CONFIG_BF537) || defined(CONFIG_BF536)
1242 if (__SILICON_REVISION__ < 3) {
1243 /*
1244 * This isn't publicly documented (fun times!), but in
1245 * silicon <=0.2, the RX and TX pins are clocked together.
1246 * So in order to recv, we must enable the transmit side
1247 * as well. This will cause a spurious TX interrupt too,
1248 * but we can easily consume that.
1249 */
1250 opmode |= TE;
1251 }
1252 #endif
1253 }
1254
1255 /* Turn on the EMAC rx */
1256 bfin_write_EMAC_OPMODE(opmode);
1257
1258 return 0;
1259 }
1260
1261 /* Our watchdog timed out. Called by the networking layer */
1262 static void bfin_mac_timeout(struct net_device *dev)
1263 {
1264 struct bfin_mac_local *lp = netdev_priv(dev);
1265
1266 pr_debug("%s: %s\n", dev->name, __func__);
1267
1268 bfin_mac_disable();
1269
1270 del_timer(&lp->tx_reclaim_timer);
1271
1272 /* reset tx queue and free skb */
1273 while (tx_list_head != current_tx_ptr) {
1274 tx_list_head->desc_a.config &= ~DMAEN;
1275 tx_list_head->status.status_word = 0;
1276 if (tx_list_head->skb) {
1277 dev_kfree_skb(tx_list_head->skb);
1278 tx_list_head->skb = NULL;
1279 }
1280 tx_list_head = tx_list_head->next;
1281 }
1282
1283 if (netif_queue_stopped(lp->ndev))
1284 netif_wake_queue(lp->ndev);
1285
1286 bfin_mac_enable(lp->phydev);
1287
1288 /* We can accept TX packets again */
1289 dev->trans_start = jiffies; /* prevent tx timeout */
1290 netif_wake_queue(dev);
1291 }
1292
1293 static void bfin_mac_multicast_hash(struct net_device *dev)
1294 {
1295 u32 emac_hashhi, emac_hashlo;
1296 struct netdev_hw_addr *ha;
1297 u32 crc;
1298
1299 emac_hashhi = emac_hashlo = 0;
1300
1301 netdev_for_each_mc_addr(ha, dev) {
1302 crc = ether_crc(ETH_ALEN, ha->addr);
1303 crc >>= 26;
1304
1305 if (crc & 0x20)
1306 emac_hashhi |= 1 << (crc & 0x1f);
1307 else
1308 emac_hashlo |= 1 << (crc & 0x1f);
1309 }
1310
1311 bfin_write_EMAC_HASHHI(emac_hashhi);
1312 bfin_write_EMAC_HASHLO(emac_hashlo);
1313 }
1314
1315 /*
1316 * This routine will, depending on the values passed to it,
1317 * either make it accept multicast packets, go into
1318 * promiscuous mode (for TCPDUMP and cousins) or accept
1319 * a select set of multicast packets
1320 */
1321 static void bfin_mac_set_multicast_list(struct net_device *dev)
1322 {
1323 u32 sysctl;
1324
1325 if (dev->flags & IFF_PROMISC) {
1326 netdev_info(dev, "set promisc mode\n");
1327 sysctl = bfin_read_EMAC_OPMODE();
1328 sysctl |= PR;
1329 bfin_write_EMAC_OPMODE(sysctl);
1330 } else if (dev->flags & IFF_ALLMULTI) {
1331 /* accept all multicast */
1332 sysctl = bfin_read_EMAC_OPMODE();
1333 sysctl |= PAM;
1334 bfin_write_EMAC_OPMODE(sysctl);
1335 } else if (!netdev_mc_empty(dev)) {
1336 /* set up multicast hash table */
1337 sysctl = bfin_read_EMAC_OPMODE();
1338 sysctl |= HM;
1339 bfin_write_EMAC_OPMODE(sysctl);
1340 bfin_mac_multicast_hash(dev);
1341 } else {
1342 /* clear promisc or multicast mode */
1343 sysctl = bfin_read_EMAC_OPMODE();
1344 sysctl &= ~(RAF | PAM);
1345 bfin_write_EMAC_OPMODE(sysctl);
1346 }
1347 }
1348
1349 static int bfin_mac_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
1350 {
1351 struct bfin_mac_local *lp = netdev_priv(netdev);
1352
1353 if (!netif_running(netdev))
1354 return -EINVAL;
1355
1356 switch (cmd) {
1357 case SIOCSHWTSTAMP:
1358 return bfin_mac_hwtstamp_ioctl(netdev, ifr, cmd);
1359 default:
1360 if (lp->phydev)
1361 return phy_mii_ioctl(lp->phydev, ifr, cmd);
1362 else
1363 return -EOPNOTSUPP;
1364 }
1365 }
1366
1367 /*
1368 * this puts the device in an inactive state
1369 */
1370 static void bfin_mac_shutdown(struct net_device *dev)
1371 {
1372 /* Turn off the EMAC */
1373 bfin_write_EMAC_OPMODE(0x00000000);
1374 /* Turn off the EMAC RX DMA */
1375 bfin_write_DMA1_CONFIG(0x0000);
1376 bfin_write_DMA2_CONFIG(0x0000);
1377 }
1378
1379 /*
1380 * Open and Initialize the interface
1381 *
1382 * Set up everything, reset the card, etc..
1383 */
1384 static int bfin_mac_open(struct net_device *dev)
1385 {
1386 struct bfin_mac_local *lp = netdev_priv(dev);
1387 int ret;
1388 pr_debug("%s: %s\n", dev->name, __func__);
1389
1390 /*
1391 * Check that the address is valid. If its not, refuse
1392 * to bring the device up. The user must specify an
1393 * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
1394 */
1395 if (!is_valid_ether_addr(dev->dev_addr)) {
1396 netdev_warn(dev, "no valid ethernet hw addr\n");
1397 return -EINVAL;
1398 }
1399
1400 /* initial rx and tx list */
1401 ret = desc_list_init(dev);
1402 if (ret)
1403 return ret;
1404
1405 phy_start(lp->phydev);
1406 phy_write(lp->phydev, MII_BMCR, BMCR_RESET);
1407 setup_system_regs(dev);
1408 setup_mac_addr(dev->dev_addr);
1409
1410 bfin_mac_disable();
1411 ret = bfin_mac_enable(lp->phydev);
1412 if (ret)
1413 return ret;
1414 pr_debug("hardware init finished\n");
1415
1416 netif_start_queue(dev);
1417 netif_carrier_on(dev);
1418
1419 return 0;
1420 }
1421
1422 /*
1423 * this makes the board clean up everything that it can
1424 * and not talk to the outside world. Caused by
1425 * an 'ifconfig ethX down'
1426 */
1427 static int bfin_mac_close(struct net_device *dev)
1428 {
1429 struct bfin_mac_local *lp = netdev_priv(dev);
1430 pr_debug("%s: %s\n", dev->name, __func__);
1431
1432 netif_stop_queue(dev);
1433 netif_carrier_off(dev);
1434
1435 phy_stop(lp->phydev);
1436 phy_write(lp->phydev, MII_BMCR, BMCR_PDOWN);
1437
1438 /* clear everything */
1439 bfin_mac_shutdown(dev);
1440
1441 /* free the rx/tx buffers */
1442 desc_list_free();
1443
1444 return 0;
1445 }
1446
1447 static const struct net_device_ops bfin_mac_netdev_ops = {
1448 .ndo_open = bfin_mac_open,
1449 .ndo_stop = bfin_mac_close,
1450 .ndo_start_xmit = bfin_mac_hard_start_xmit,
1451 .ndo_set_mac_address = bfin_mac_set_mac_address,
1452 .ndo_tx_timeout = bfin_mac_timeout,
1453 .ndo_set_rx_mode = bfin_mac_set_multicast_list,
1454 .ndo_do_ioctl = bfin_mac_ioctl,
1455 .ndo_validate_addr = eth_validate_addr,
1456 .ndo_change_mtu = eth_change_mtu,
1457 #ifdef CONFIG_NET_POLL_CONTROLLER
1458 .ndo_poll_controller = bfin_mac_poll,
1459 #endif
1460 };
1461
1462 static int __devinit bfin_mac_probe(struct platform_device *pdev)
1463 {
1464 struct net_device *ndev;
1465 struct bfin_mac_local *lp;
1466 struct platform_device *pd;
1467 struct bfin_mii_bus_platform_data *mii_bus_data;
1468 int rc;
1469
1470 ndev = alloc_etherdev(sizeof(struct bfin_mac_local));
1471 if (!ndev)
1472 return -ENOMEM;
1473
1474 SET_NETDEV_DEV(ndev, &pdev->dev);
1475 platform_set_drvdata(pdev, ndev);
1476 lp = netdev_priv(ndev);
1477 lp->ndev = ndev;
1478
1479 /* Grab the MAC address in the MAC */
1480 *(__le32 *) (&(ndev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
1481 *(__le16 *) (&(ndev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());
1482
1483 /* probe mac */
1484 /*todo: how to proble? which is revision_register */
1485 bfin_write_EMAC_ADDRLO(0x12345678);
1486 if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
1487 dev_err(&pdev->dev, "Cannot detect Blackfin on-chip ethernet MAC controller!\n");
1488 rc = -ENODEV;
1489 goto out_err_probe_mac;
1490 }
1491
1492
1493 /*
1494 * Is it valid? (Did bootloader initialize it?)
1495 * Grab the MAC from the board somehow
1496 * this is done in the arch/blackfin/mach-bfxxx/boards/eth_mac.c
1497 */
1498 if (!is_valid_ether_addr(ndev->dev_addr)) {
1499 if (bfin_get_ether_addr(ndev->dev_addr) ||
1500 !is_valid_ether_addr(ndev->dev_addr)) {
1501 /* Still not valid, get a random one */
1502 netdev_warn(ndev, "Setting Ethernet MAC to a random one\n");
1503 eth_hw_addr_random(ndev);
1504 }
1505 }
1506
1507 setup_mac_addr(ndev->dev_addr);
1508
1509 if (!pdev->dev.platform_data) {
1510 dev_err(&pdev->dev, "Cannot get platform device bfin_mii_bus!\n");
1511 rc = -ENODEV;
1512 goto out_err_probe_mac;
1513 }
1514 pd = pdev->dev.platform_data;
1515 lp->mii_bus = platform_get_drvdata(pd);
1516 if (!lp->mii_bus) {
1517 dev_err(&pdev->dev, "Cannot get mii_bus!\n");
1518 rc = -ENODEV;
1519 goto out_err_probe_mac;
1520 }
1521 lp->mii_bus->priv = ndev;
1522 mii_bus_data = pd->dev.platform_data;
1523
1524 rc = mii_probe(ndev, mii_bus_data->phy_mode);
1525 if (rc) {
1526 dev_err(&pdev->dev, "MII Probe failed!\n");
1527 goto out_err_mii_probe;
1528 }
1529
1530 lp->vlan1_mask = ETH_P_8021Q | mii_bus_data->vlan1_mask;
1531 lp->vlan2_mask = ETH_P_8021Q | mii_bus_data->vlan2_mask;
1532
1533 /* Fill in the fields of the device structure with ethernet values. */
1534 ether_setup(ndev);
1535
1536 ndev->netdev_ops = &bfin_mac_netdev_ops;
1537 ndev->ethtool_ops = &bfin_mac_ethtool_ops;
1538
1539 init_timer(&lp->tx_reclaim_timer);
1540 lp->tx_reclaim_timer.data = (unsigned long)lp;
1541 lp->tx_reclaim_timer.function = tx_reclaim_skb_timeout;
1542
1543 spin_lock_init(&lp->lock);
1544
1545 /* now, enable interrupts */
1546 /* register irq handler */
1547 rc = request_irq(IRQ_MAC_RX, bfin_mac_interrupt,
1548 IRQF_DISABLED, "EMAC_RX", ndev);
1549 if (rc) {
1550 dev_err(&pdev->dev, "Cannot request Blackfin MAC RX IRQ!\n");
1551 rc = -EBUSY;
1552 goto out_err_request_irq;
1553 }
1554
1555 rc = register_netdev(ndev);
1556 if (rc) {
1557 dev_err(&pdev->dev, "Cannot register net device!\n");
1558 goto out_err_reg_ndev;
1559 }
1560
1561 bfin_mac_hwtstamp_init(ndev);
1562
1563 /* now, print out the card info, in a short format.. */
1564 netdev_info(ndev, "%s, Version %s\n", DRV_DESC, DRV_VERSION);
1565
1566 return 0;
1567
1568 out_err_reg_ndev:
1569 free_irq(IRQ_MAC_RX, ndev);
1570 out_err_request_irq:
1571 out_err_mii_probe:
1572 mdiobus_unregister(lp->mii_bus);
1573 mdiobus_free(lp->mii_bus);
1574 out_err_probe_mac:
1575 platform_set_drvdata(pdev, NULL);
1576 free_netdev(ndev);
1577
1578 return rc;
1579 }
1580
1581 static int __devexit bfin_mac_remove(struct platform_device *pdev)
1582 {
1583 struct net_device *ndev = platform_get_drvdata(pdev);
1584 struct bfin_mac_local *lp = netdev_priv(ndev);
1585
1586 platform_set_drvdata(pdev, NULL);
1587
1588 lp->mii_bus->priv = NULL;
1589
1590 unregister_netdev(ndev);
1591
1592 free_irq(IRQ_MAC_RX, ndev);
1593
1594 free_netdev(ndev);
1595
1596 return 0;
1597 }
1598
1599 #ifdef CONFIG_PM
1600 static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t mesg)
1601 {
1602 struct net_device *net_dev = platform_get_drvdata(pdev);
1603 struct bfin_mac_local *lp = netdev_priv(net_dev);
1604
1605 if (lp->wol) {
1606 bfin_write_EMAC_OPMODE((bfin_read_EMAC_OPMODE() & ~TE) | RE);
1607 bfin_write_EMAC_WKUP_CTL(MPKE);
1608 enable_irq_wake(IRQ_MAC_WAKEDET);
1609 } else {
1610 if (netif_running(net_dev))
1611 bfin_mac_close(net_dev);
1612 }
1613
1614 return 0;
1615 }
1616
1617 static int bfin_mac_resume(struct platform_device *pdev)
1618 {
1619 struct net_device *net_dev = platform_get_drvdata(pdev);
1620 struct bfin_mac_local *lp = netdev_priv(net_dev);
1621
1622 if (lp->wol) {
1623 bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
1624 bfin_write_EMAC_WKUP_CTL(0);
1625 disable_irq_wake(IRQ_MAC_WAKEDET);
1626 } else {
1627 if (netif_running(net_dev))
1628 bfin_mac_open(net_dev);
1629 }
1630
1631 return 0;
1632 }
1633 #else
1634 #define bfin_mac_suspend NULL
1635 #define bfin_mac_resume NULL
1636 #endif /* CONFIG_PM */
1637
1638 static int __devinit bfin_mii_bus_probe(struct platform_device *pdev)
1639 {
1640 struct mii_bus *miibus;
1641 struct bfin_mii_bus_platform_data *mii_bus_pd;
1642 const unsigned short *pin_req;
1643 int rc, i;
1644
1645 mii_bus_pd = dev_get_platdata(&pdev->dev);
1646 if (!mii_bus_pd) {
1647 dev_err(&pdev->dev, "No peripherals in platform data!\n");
1648 return -EINVAL;
1649 }
1650
1651 /*
1652 * We are setting up a network card,
1653 * so set the GPIO pins to Ethernet mode
1654 */
1655 pin_req = mii_bus_pd->mac_peripherals;
1656 rc = peripheral_request_list(pin_req, KBUILD_MODNAME);
1657 if (rc) {
1658 dev_err(&pdev->dev, "Requesting peripherals failed!\n");
1659 return rc;
1660 }
1661
1662 rc = -ENOMEM;
1663 miibus = mdiobus_alloc();
1664 if (miibus == NULL)
1665 goto out_err_alloc;
1666 miibus->read = bfin_mdiobus_read;
1667 miibus->write = bfin_mdiobus_write;
1668 miibus->reset = bfin_mdiobus_reset;
1669
1670 miibus->parent = &pdev->dev;
1671 miibus->name = "bfin_mii_bus";
1672 miibus->phy_mask = mii_bus_pd->phy_mask;
1673
1674 snprintf(miibus->id, MII_BUS_ID_SIZE, "%s-%x",
1675 pdev->name, pdev->id);
1676 miibus->irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
1677 if (!miibus->irq)
1678 goto out_err_irq_alloc;
1679
1680 for (i = rc; i < PHY_MAX_ADDR; ++i)
1681 miibus->irq[i] = PHY_POLL;
1682
1683 rc = clamp(mii_bus_pd->phydev_number, 0, PHY_MAX_ADDR);
1684 if (rc != mii_bus_pd->phydev_number)
1685 dev_err(&pdev->dev, "Invalid number (%i) of phydevs\n",
1686 mii_bus_pd->phydev_number);
1687 for (i = 0; i < rc; ++i) {
1688 unsigned short phyaddr = mii_bus_pd->phydev_data[i].addr;
1689 if (phyaddr < PHY_MAX_ADDR)
1690 miibus->irq[phyaddr] = mii_bus_pd->phydev_data[i].irq;
1691 else
1692 dev_err(&pdev->dev,
1693 "Invalid PHY address %i for phydev %i\n",
1694 phyaddr, i);
1695 }
1696
1697 rc = mdiobus_register(miibus);
1698 if (rc) {
1699 dev_err(&pdev->dev, "Cannot register MDIO bus!\n");
1700 goto out_err_mdiobus_register;
1701 }
1702
1703 platform_set_drvdata(pdev, miibus);
1704 return 0;
1705
1706 out_err_mdiobus_register:
1707 kfree(miibus->irq);
1708 out_err_irq_alloc:
1709 mdiobus_free(miibus);
1710 out_err_alloc:
1711 peripheral_free_list(pin_req);
1712
1713 return rc;
1714 }
1715
1716 static int __devexit bfin_mii_bus_remove(struct platform_device *pdev)
1717 {
1718 struct mii_bus *miibus = platform_get_drvdata(pdev);
1719 struct bfin_mii_bus_platform_data *mii_bus_pd =
1720 dev_get_platdata(&pdev->dev);
1721
1722 platform_set_drvdata(pdev, NULL);
1723 mdiobus_unregister(miibus);
1724 kfree(miibus->irq);
1725 mdiobus_free(miibus);
1726 peripheral_free_list(mii_bus_pd->mac_peripherals);
1727
1728 return 0;
1729 }
1730
1731 static struct platform_driver bfin_mii_bus_driver = {
1732 .probe = bfin_mii_bus_probe,
1733 .remove = __devexit_p(bfin_mii_bus_remove),
1734 .driver = {
1735 .name = "bfin_mii_bus",
1736 .owner = THIS_MODULE,
1737 },
1738 };
1739
1740 static struct platform_driver bfin_mac_driver = {
1741 .probe = bfin_mac_probe,
1742 .remove = __devexit_p(bfin_mac_remove),
1743 .resume = bfin_mac_resume,
1744 .suspend = bfin_mac_suspend,
1745 .driver = {
1746 .name = KBUILD_MODNAME,
1747 .owner = THIS_MODULE,
1748 },
1749 };
1750
1751 static int __init bfin_mac_init(void)
1752 {
1753 int ret;
1754 ret = platform_driver_register(&bfin_mii_bus_driver);
1755 if (!ret)
1756 return platform_driver_register(&bfin_mac_driver);
1757 return -ENODEV;
1758 }
1759
1760 module_init(bfin_mac_init);
1761
1762 static void __exit bfin_mac_cleanup(void)
1763 {
1764 platform_driver_unregister(&bfin_mac_driver);
1765 platform_driver_unregister(&bfin_mii_bus_driver);
1766 }
1767
1768 module_exit(bfin_mac_cleanup);
1769
Linux with added FPC-III support