Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/net/ethernet/adi/bfin_mac.c

  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                         goto init_error;
193 
194                 skb_reserve(new_skb, NET_IP_ALIGN);
195                 /* Invidate the data cache of skb->data range when it is write back
196                  * cache. It will prevent overwritting the new data from DMA
197                  */
198                 blackfin_dcache_invalidate_range((unsigned long)new_skb->head,
199                                          (unsigned long)new_skb->end);
200                 r->skb = new_skb;
201 
202                 /*
203                  * enabled DMA
204                  * write to memory WNR = 1
205                  * wordsize is 32 bits
206                  * disable interrupt
207                  * 6 half words is desc size
208                  * large desc flow
209                  */
210                 a->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
211                 /* since RXDWA is enabled */
212                 a->start_addr = (unsigned long)new_skb->data - 2;
213                 a->x_count = 0;
214                 a->next_dma_desc = b;
215 
216                 /*
217                  * enabled DMA
218                  * write to memory WNR = 1
219                  * wordsize is 32 bits
220                  * enable interrupt
221                  * 6 half words is desc size
222                  * large desc flow
223                  */
224                 b->config = DMAEN | WNR | WDSIZE_32 | DI_EN |
225                                 NDSIZE_6 | DMAFLOW_LARGE;
226                 b->start_addr = (unsigned long)(&(r->status));
227                 b->x_count = 0;
228 
229                 rx_list_tail->desc_b.next_dma_desc = a;
230                 rx_list_tail->next = r;
231                 rx_list_tail = r;
232         }
233         rx_list_tail->next = rx_list_head;      /* rx_list is a circle */
234         rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a);
235         current_rx_ptr = rx_list_head;
236 
237         return 0;
238 
239 init_error:
240         desc_list_free();
241         pr_err("kmalloc failed\n");
242         return -ENOMEM;
243 }
244 
245 
246 /*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/
247 
248 /*
249  * MII operations
250  */
251 /* Wait until the previous MDC/MDIO transaction has completed */
252 static int bfin_mdio_poll(void)
253 {
254         int timeout_cnt = MAX_TIMEOUT_CNT;
255 
256         /* poll the STABUSY bit */
257         while ((bfin_read_EMAC_STAADD()) & STABUSY) {
258                 udelay(1);
259                 if (timeout_cnt-- < 0) {
260                         pr_err("wait MDC/MDIO transaction to complete timeout\n");
261                         return -ETIMEDOUT;
262                 }
263         }
264 
265         return 0;
266 }
267 
268 /* Read an off-chip register in a PHY through the MDC/MDIO port */
269 static int bfin_mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
270 {
271         int ret;
272 
273         ret = bfin_mdio_poll();
274         if (ret)
275                 return ret;
276 
277         /* read mode */
278         bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
279                                 SET_REGAD((u16) regnum) |
280                                 STABUSY);
281 
282         ret = bfin_mdio_poll();
283         if (ret)
284                 return ret;
285 
286         return (int) bfin_read_EMAC_STADAT();
287 }
288 
289 /* Write an off-chip register in a PHY through the MDC/MDIO port */
290 static int bfin_mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum,
291                               u16 value)
292 {
293         int ret;
294 
295         ret = bfin_mdio_poll();
296         if (ret)
297                 return ret;
298 
299         bfin_write_EMAC_STADAT((u32) value);
300 
301         /* write mode */
302         bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
303                                 SET_REGAD((u16) regnum) |
304                                 STAOP |
305                                 STABUSY);
306 
307         return bfin_mdio_poll();
308 }
309 
310 static void bfin_mac_adjust_link(struct net_device *dev)
311 {
312         struct bfin_mac_local *lp = netdev_priv(dev);
313         struct phy_device *phydev = lp->phydev;
314         unsigned long flags;
315         int new_state = 0;
316 
317         spin_lock_irqsave(&lp->lock, flags);
318         if (phydev->link) {
319                 /* Now we make sure that we can be in full duplex mode.
320                  * If not, we operate in half-duplex mode. */
321                 if (phydev->duplex != lp->old_duplex) {
322                         u32 opmode = bfin_read_EMAC_OPMODE();
323                         new_state = 1;
324 
325                         if (phydev->duplex)
326                                 opmode |= FDMODE;
327                         else
328                                 opmode &= ~(FDMODE);
329 
330                         bfin_write_EMAC_OPMODE(opmode);
331                         lp->old_duplex = phydev->duplex;
332                 }
333 
334                 if (phydev->speed != lp->old_speed) {
335                         if (phydev->interface == PHY_INTERFACE_MODE_RMII) {
336                                 u32 opmode = bfin_read_EMAC_OPMODE();
337                                 switch (phydev->speed) {
338                                 case 10:
339                                         opmode |= RMII_10;
340                                         break;
341                                 case 100:
342                                         opmode &= ~RMII_10;
343                                         break;
344                                 default:
345                                         netdev_warn(dev,
346                                                 "Ack! Speed (%d) is not 10/100!\n",
347                                                 phydev->speed);
348                                         break;
349                                 }
350                                 bfin_write_EMAC_OPMODE(opmode);
351                         }
352 
353                         new_state = 1;
354                         lp->old_speed = phydev->speed;
355                 }
356 
357                 if (!lp->old_link) {
358                         new_state = 1;
359                         lp->old_link = 1;
360                 }
361         } else if (lp->old_link) {
362                 new_state = 1;
363                 lp->old_link = 0;
364                 lp->old_speed = 0;
365                 lp->old_duplex = -1;
366         }
367 
368         if (new_state) {
369                 u32 opmode = bfin_read_EMAC_OPMODE();
370                 phy_print_status(phydev);
371                 pr_debug("EMAC_OPMODE = 0x%08x\n", opmode);
372         }
373 
374         spin_unlock_irqrestore(&lp->lock, flags);
375 }
376 
377 /* MDC  = 2.5 MHz */
378 #define MDC_CLK 2500000
379 
380 static int mii_probe(struct net_device *dev, int phy_mode)
381 {
382         struct bfin_mac_local *lp = netdev_priv(dev);
383         struct phy_device *phydev = NULL;
384         unsigned short sysctl;
385         int i;
386         u32 sclk, mdc_div;
387 
388         /* Enable PHY output early */
389         if (!(bfin_read_VR_CTL() & CLKBUFOE))
390                 bfin_write_VR_CTL(bfin_read_VR_CTL() | CLKBUFOE);
391 
392         sclk = get_sclk();
393         mdc_div = ((sclk / MDC_CLK) / 2) - 1;
394 
395         sysctl = bfin_read_EMAC_SYSCTL();
396         sysctl = (sysctl & ~MDCDIV) | SET_MDCDIV(mdc_div);
397         bfin_write_EMAC_SYSCTL(sysctl);
398 
399         /* search for connected PHY device */
400         for (i = 0; i < PHY_MAX_ADDR; ++i) {
401                 struct phy_device *const tmp_phydev = lp->mii_bus->phy_map[i];
402 
403                 if (!tmp_phydev)
404                         continue; /* no PHY here... */
405 
406                 phydev = tmp_phydev;
407                 break; /* found it */
408         }
409 
410         /* now we are supposed to have a proper phydev, to attach to... */
411         if (!phydev) {
412                 netdev_err(dev, "no phy device found\n");
413                 return -ENODEV;
414         }
415 
416         if (phy_mode != PHY_INTERFACE_MODE_RMII &&
417                 phy_mode != PHY_INTERFACE_MODE_MII) {
418                 netdev_err(dev, "invalid phy interface mode\n");
419                 return -EINVAL;
420         }
421 
422         phydev = phy_connect(dev, dev_name(&phydev->dev),
423                              &bfin_mac_adjust_link, phy_mode);
424 
425         if (IS_ERR(phydev)) {
426                 netdev_err(dev, "could not attach PHY\n");
427                 return PTR_ERR(phydev);
428         }
429 
430         /* mask with MAC supported features */
431         phydev->supported &= (SUPPORTED_10baseT_Half
432                               | SUPPORTED_10baseT_Full
433                               | SUPPORTED_100baseT_Half
434                               | SUPPORTED_100baseT_Full
435                               | SUPPORTED_Autoneg
436                               | SUPPORTED_Pause | SUPPORTED_Asym_Pause
437                               | SUPPORTED_MII
438                               | SUPPORTED_TP);
439 
440         phydev->advertising = phydev->supported;
441 
442         lp->old_link = 0;
443         lp->old_speed = 0;
444         lp->old_duplex = -1;
445         lp->phydev = phydev;
446 
447         pr_info("attached PHY driver [%s] "
448                 "(mii_bus:phy_addr=%s, irq=%d, mdc_clk=%dHz(mdc_div=%d)@sclk=%dMHz)\n",
449                 phydev->drv->name, dev_name(&phydev->dev), phydev->irq,
450                 MDC_CLK, mdc_div, sclk/1000000);
451 
452         return 0;
453 }
454 
455 /*
456  * Ethtool support
457  */
458 
459 /*
460  * interrupt routine for magic packet wakeup
461  */
462 static irqreturn_t bfin_mac_wake_interrupt(int irq, void *dev_id)
463 {
464         return IRQ_HANDLED;
465 }
466 
467 static int
468 bfin_mac_ethtool_getsettings(struct net_device *dev, struct ethtool_cmd *cmd)
469 {
470         struct bfin_mac_local *lp = netdev_priv(dev);
471 
472         if (lp->phydev)
473                 return phy_ethtool_gset(lp->phydev, cmd);
474 
475         return -EINVAL;
476 }
477 
478 static int
479 bfin_mac_ethtool_setsettings(struct net_device *dev, struct ethtool_cmd *cmd)
480 {
481         struct bfin_mac_local *lp = netdev_priv(dev);
482 
483         if (!capable(CAP_NET_ADMIN))
484                 return -EPERM;
485 
486         if (lp->phydev)
487                 return phy_ethtool_sset(lp->phydev, cmd);
488 
489         return -EINVAL;
490 }
491 
492 static void bfin_mac_ethtool_getdrvinfo(struct net_device *dev,
493                                         struct ethtool_drvinfo *info)
494 {
495         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
496         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
497         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
498         strlcpy(info->bus_info, dev_name(&dev->dev), sizeof(info->bus_info));
499 }
500 
501 static void bfin_mac_ethtool_getwol(struct net_device *dev,
502         struct ethtool_wolinfo *wolinfo)
503 {
504         struct bfin_mac_local *lp = netdev_priv(dev);
505 
506         wolinfo->supported = WAKE_MAGIC;
507         wolinfo->wolopts = lp->wol;
508 }
509 
510 static int bfin_mac_ethtool_setwol(struct net_device *dev,
511         struct ethtool_wolinfo *wolinfo)
512 {
513         struct bfin_mac_local *lp = netdev_priv(dev);
514         int rc;
515 
516         if (wolinfo->wolopts & (WAKE_MAGICSECURE |
517                                 WAKE_UCAST |
518                                 WAKE_MCAST |
519                                 WAKE_BCAST |
520                                 WAKE_ARP))
521                 return -EOPNOTSUPP;
522 
523         lp->wol = wolinfo->wolopts;
524 
525         if (lp->wol && !lp->irq_wake_requested) {
526                 /* register wake irq handler */
527                 rc = request_irq(IRQ_MAC_WAKEDET, bfin_mac_wake_interrupt,
528                                  0, "EMAC_WAKE", dev);
529                 if (rc)
530                         return rc;
531                 lp->irq_wake_requested = true;
532         }
533 
534         if (!lp->wol && lp->irq_wake_requested) {
535                 free_irq(IRQ_MAC_WAKEDET, dev);
536                 lp->irq_wake_requested = false;
537         }
538 
539         /* Make sure the PHY driver doesn't suspend */
540         device_init_wakeup(&dev->dev, lp->wol);
541 
542         return 0;
543 }
544 
545 #ifdef CONFIG_BFIN_MAC_USE_HWSTAMP
546 static int bfin_mac_ethtool_get_ts_info(struct net_device *dev,
547         struct ethtool_ts_info *info)
548 {
549         struct bfin_mac_local *lp = netdev_priv(dev);
550 
551         info->so_timestamping =
552                 SOF_TIMESTAMPING_TX_HARDWARE |
553                 SOF_TIMESTAMPING_RX_HARDWARE |
554                 SOF_TIMESTAMPING_RAW_HARDWARE;
555         info->phc_index = lp->phc_index;
556         info->tx_types =
557                 (1 << HWTSTAMP_TX_OFF) |
558                 (1 << HWTSTAMP_TX_ON);
559         info->rx_filters =
560                 (1 << HWTSTAMP_FILTER_NONE) |
561                 (1 << HWTSTAMP_FILTER_PTP_V1_L4_EVENT) |
562                 (1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
563                 (1 << HWTSTAMP_FILTER_PTP_V2_L4_EVENT);
564         return 0;
565 }
566 #endif
567 
568 static const struct ethtool_ops bfin_mac_ethtool_ops = {
569         .get_settings = bfin_mac_ethtool_getsettings,
570         .set_settings = bfin_mac_ethtool_setsettings,
571         .get_link = ethtool_op_get_link,
572         .get_drvinfo = bfin_mac_ethtool_getdrvinfo,
573         .get_wol = bfin_mac_ethtool_getwol,
574         .set_wol = bfin_mac_ethtool_setwol,
575 #ifdef CONFIG_BFIN_MAC_USE_HWSTAMP
576         .get_ts_info = bfin_mac_ethtool_get_ts_info,
577 #endif
578 };
579 
580 /**************************************************************************/
581 static void setup_system_regs(struct net_device *dev)
582 {
583         struct bfin_mac_local *lp = netdev_priv(dev);
584         int i;
585         unsigned short sysctl;
586 
587         /*
588          * Odd word alignment for Receive Frame DMA word
589          * Configure checksum support and rcve frame word alignment
590          */
591         sysctl = bfin_read_EMAC_SYSCTL();
592         /*
593          * check if interrupt is requested for any PHY,
594          * enable PHY interrupt only if needed
595          */
596         for (i = 0; i < PHY_MAX_ADDR; ++i)
597                 if (lp->mii_bus->irq[i] != PHY_POLL)
598                         break;
599         if (i < PHY_MAX_ADDR)
600                 sysctl |= PHYIE;
601         sysctl |= RXDWA;
602 #if defined(BFIN_MAC_CSUM_OFFLOAD)
603         sysctl |= RXCKS;
604 #else
605         sysctl &= ~RXCKS;
606 #endif
607         bfin_write_EMAC_SYSCTL(sysctl);
608 
609         bfin_write_EMAC_MMC_CTL(RSTC | CROLL);
610 
611         /* Set vlan regs to let 1522 bytes long packets pass through */
612         bfin_write_EMAC_VLAN1(lp->vlan1_mask);
613         bfin_write_EMAC_VLAN2(lp->vlan2_mask);
614 
615         /* Initialize the TX DMA channel registers */
616         bfin_write_DMA2_X_COUNT(0);
617         bfin_write_DMA2_X_MODIFY(4);
618         bfin_write_DMA2_Y_COUNT(0);
619         bfin_write_DMA2_Y_MODIFY(0);
620 
621         /* Initialize the RX DMA channel registers */
622         bfin_write_DMA1_X_COUNT(0);
623         bfin_write_DMA1_X_MODIFY(4);
624         bfin_write_DMA1_Y_COUNT(0);
625         bfin_write_DMA1_Y_MODIFY(0);
626 }
627 
628 static void setup_mac_addr(u8 *mac_addr)
629 {
630         u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]);
631         u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]);
632 
633         /* this depends on a little-endian machine */
634         bfin_write_EMAC_ADDRLO(addr_low);
635         bfin_write_EMAC_ADDRHI(addr_hi);
636 }
637 
638 static int bfin_mac_set_mac_address(struct net_device *dev, void *p)
639 {
640         struct sockaddr *addr = p;
641         if (netif_running(dev))
642                 return -EBUSY;
643         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
644         setup_mac_addr(dev->dev_addr);
645         return 0;
646 }
647 
648 #ifdef CONFIG_BFIN_MAC_USE_HWSTAMP
649 #define bfin_mac_hwtstamp_is_none(cfg) ((cfg) == HWTSTAMP_FILTER_NONE)
650 
651 static u32 bfin_select_phc_clock(u32 input_clk, unsigned int *shift_result)
652 {
653         u32 ipn = 1000000000UL / input_clk;
654         u32 ppn = 1;
655         unsigned int shift = 0;
656 
657         while (ppn <= ipn) {
658                 ppn <<= 1;
659                 shift++;
660         }
661         *shift_result = shift;
662         return 1000000000UL / ppn;
663 }
664 
665 static int bfin_mac_hwtstamp_set(struct net_device *netdev,
666                                  struct ifreq *ifr)
667 {
668         struct hwtstamp_config config;
669         struct bfin_mac_local *lp = netdev_priv(netdev);
670         u16 ptpctl;
671         u32 ptpfv1, ptpfv2, ptpfv3, ptpfoff;
672 
673         if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
674                 return -EFAULT;
675 
676         pr_debug("%s config flag:0x%x, tx_type:0x%x, rx_filter:0x%x\n",
677                         __func__, config.flags, config.tx_type, config.rx_filter);
678 
679         /* reserved for future extensions */
680         if (config.flags)
681                 return -EINVAL;
682 
683         if ((config.tx_type != HWTSTAMP_TX_OFF) &&
684                         (config.tx_type != HWTSTAMP_TX_ON))
685                 return -ERANGE;
686 
687         ptpctl = bfin_read_EMAC_PTP_CTL();
688 
689         switch (config.rx_filter) {
690         case HWTSTAMP_FILTER_NONE:
691                 /*
692                  * Dont allow any timestamping
693                  */
694                 ptpfv3 = 0xFFFFFFFF;
695                 bfin_write_EMAC_PTP_FV3(ptpfv3);
696                 break;
697         case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
698         case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
699         case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
700                 /*
701                  * Clear the five comparison mask bits (bits[12:8]) in EMAC_PTP_CTL)
702                  * to enable all the field matches.
703                  */
704                 ptpctl &= ~0x1F00;
705                 bfin_write_EMAC_PTP_CTL(ptpctl);
706                 /*
707                  * Keep the default values of the EMAC_PTP_FOFF register.
708                  */
709                 ptpfoff = 0x4A24170C;
710                 bfin_write_EMAC_PTP_FOFF(ptpfoff);
711                 /*
712                  * Keep the default values of the EMAC_PTP_FV1 and EMAC_PTP_FV2
713                  * registers.
714                  */
715                 ptpfv1 = 0x11040800;
716                 bfin_write_EMAC_PTP_FV1(ptpfv1);
717                 ptpfv2 = 0x0140013F;
718                 bfin_write_EMAC_PTP_FV2(ptpfv2);
719                 /*
720                  * The default value (0xFFFC) allows the timestamping of both
721                  * received Sync messages and Delay_Req messages.
722                  */
723                 ptpfv3 = 0xFFFFFFFC;
724                 bfin_write_EMAC_PTP_FV3(ptpfv3);
725 
726                 config.rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
727                 break;
728         case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
729         case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
730         case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
731                 /* Clear all five comparison mask bits (bits[12:8]) in the
732                  * EMAC_PTP_CTL register to enable all the field matches.
733                  */
734                 ptpctl &= ~0x1F00;
735                 bfin_write_EMAC_PTP_CTL(ptpctl);
736                 /*
737                  * Keep the default values of the EMAC_PTP_FOFF register, except set
738                  * the PTPCOF field to 0x2A.
739                  */
740                 ptpfoff = 0x2A24170C;
741                 bfin_write_EMAC_PTP_FOFF(ptpfoff);
742                 /*
743                  * Keep the default values of the EMAC_PTP_FV1 and EMAC_PTP_FV2
744                  * registers.
745                  */
746                 ptpfv1 = 0x11040800;
747                 bfin_write_EMAC_PTP_FV1(ptpfv1);
748                 ptpfv2 = 0x0140013F;
749                 bfin_write_EMAC_PTP_FV2(ptpfv2);
750                 /*
751                  * To allow the timestamping of Pdelay_Req and Pdelay_Resp, set
752                  * the value to 0xFFF0.
753                  */
754                 ptpfv3 = 0xFFFFFFF0;
755                 bfin_write_EMAC_PTP_FV3(ptpfv3);
756 
757                 config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
758                 break;
759         case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
760         case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
761         case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
762                 /*
763                  * Clear bits 8 and 12 of the EMAC_PTP_CTL register to enable only the
764                  * EFTM and PTPCM field comparison.
765                  */
766                 ptpctl &= ~0x1100;
767                 bfin_write_EMAC_PTP_CTL(ptpctl);
768                 /*
769                  * Keep the default values of all the fields of the EMAC_PTP_FOFF
770                  * register, except set the PTPCOF field to 0x0E.
771                  */
772                 ptpfoff = 0x0E24170C;
773                 bfin_write_EMAC_PTP_FOFF(ptpfoff);
774                 /*
775                  * Program bits [15:0] of the EMAC_PTP_FV1 register to 0x88F7, which
776                  * corresponds to PTP messages on the MAC layer.
777                  */
778                 ptpfv1 = 0x110488F7;
779                 bfin_write_EMAC_PTP_FV1(ptpfv1);
780                 ptpfv2 = 0x0140013F;
781                 bfin_write_EMAC_PTP_FV2(ptpfv2);
782                 /*
783                  * To allow the timestamping of Pdelay_Req and Pdelay_Resp
784                  * messages, set the value to 0xFFF0.
785                  */
786                 ptpfv3 = 0xFFFFFFF0;
787                 bfin_write_EMAC_PTP_FV3(ptpfv3);
788 
789                 config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
790                 break;
791         default:
792                 return -ERANGE;
793         }
794 
795         if (config.tx_type == HWTSTAMP_TX_OFF &&
796             bfin_mac_hwtstamp_is_none(config.rx_filter)) {
797                 ptpctl &= ~PTP_EN;
798                 bfin_write_EMAC_PTP_CTL(ptpctl);
799 
800                 SSYNC();
801         } else {
802                 ptpctl |= PTP_EN;
803                 bfin_write_EMAC_PTP_CTL(ptpctl);
804 
805                 /*
806                  * clear any existing timestamp
807                  */
808                 bfin_read_EMAC_PTP_RXSNAPLO();
809                 bfin_read_EMAC_PTP_RXSNAPHI();
810 
811                 bfin_read_EMAC_PTP_TXSNAPLO();
812                 bfin_read_EMAC_PTP_TXSNAPHI();
813 
814                 SSYNC();
815         }
816 
817         lp->stamp_cfg = config;
818         return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
819                 -EFAULT : 0;
820 }
821 
822 static int bfin_mac_hwtstamp_get(struct net_device *netdev,
823                                  struct ifreq *ifr)
824 {
825         struct bfin_mac_local *lp = netdev_priv(netdev);
826 
827         return copy_to_user(ifr->ifr_data, &lp->stamp_cfg,
828                             sizeof(lp->stamp_cfg)) ?
829                 -EFAULT : 0;
830 }
831 
832 static void bfin_tx_hwtstamp(struct net_device *netdev, struct sk_buff *skb)
833 {
834         struct bfin_mac_local *lp = netdev_priv(netdev);
835 
836         if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
837                 int timeout_cnt = MAX_TIMEOUT_CNT;
838 
839                 /* When doing time stamping, keep the connection to the socket
840                  * a while longer
841                  */
842                 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
843 
844                 /*
845                  * The timestamping is done at the EMAC module's MII/RMII interface
846                  * when the module sees the Start of Frame of an event message packet. This
847                  * interface is the closest possible place to the physical Ethernet transmission
848                  * medium, providing the best timing accuracy.
849                  */
850                 while ((!(bfin_read_EMAC_PTP_ISTAT() & TXTL)) && (--timeout_cnt))
851                         udelay(1);
852                 if (timeout_cnt == 0)
853                         netdev_err(netdev, "timestamp the TX packet failed\n");
854                 else {
855                         struct skb_shared_hwtstamps shhwtstamps;
856                         u64 ns;
857                         u64 regval;
858 
859                         regval = bfin_read_EMAC_PTP_TXSNAPLO();
860                         regval |= (u64)bfin_read_EMAC_PTP_TXSNAPHI() << 32;
861                         memset(&shhwtstamps, 0, sizeof(shhwtstamps));
862                         ns = regval << lp->shift;
863                         shhwtstamps.hwtstamp = ns_to_ktime(ns);
864                         skb_tstamp_tx(skb, &shhwtstamps);
865                 }
866         }
867 }
868 
869 static void bfin_rx_hwtstamp(struct net_device *netdev, struct sk_buff *skb)
870 {
871         struct bfin_mac_local *lp = netdev_priv(netdev);
872         u32 valid;
873         u64 regval, ns;
874         struct skb_shared_hwtstamps *shhwtstamps;
875 
876         if (bfin_mac_hwtstamp_is_none(lp->stamp_cfg.rx_filter))
877                 return;
878 
879         valid = bfin_read_EMAC_PTP_ISTAT() & RXEL;
880         if (!valid)
881                 return;
882 
883         shhwtstamps = skb_hwtstamps(skb);
884 
885         regval = bfin_read_EMAC_PTP_RXSNAPLO();
886         regval |= (u64)bfin_read_EMAC_PTP_RXSNAPHI() << 32;
887         ns = regval << lp->shift;
888         memset(shhwtstamps, 0, sizeof(*shhwtstamps));
889         shhwtstamps->hwtstamp = ns_to_ktime(ns);
890 }
891 
892 static void bfin_mac_hwtstamp_init(struct net_device *netdev)
893 {
894         struct bfin_mac_local *lp = netdev_priv(netdev);
895         u64 addend, ppb;
896         u32 input_clk, phc_clk;
897 
898         /* Initialize hardware timer */
899         input_clk = get_sclk();
900         phc_clk = bfin_select_phc_clock(input_clk, &lp->shift);
901         addend = phc_clk * (1ULL << 32);
902         do_div(addend, input_clk);
903         bfin_write_EMAC_PTP_ADDEND((u32)addend);
904 
905         lp->addend = addend;
906         ppb = 1000000000ULL * input_clk;
907         do_div(ppb, phc_clk);
908         lp->max_ppb = ppb - 1000000000ULL - 1ULL;
909 
910         /* Initialize hwstamp config */
911         lp->stamp_cfg.rx_filter = HWTSTAMP_FILTER_NONE;
912         lp->stamp_cfg.tx_type = HWTSTAMP_TX_OFF;
913 }
914 
915 static u64 bfin_ptp_time_read(struct bfin_mac_local *lp)
916 {
917         u64 ns;
918         u32 lo, hi;
919 
920         lo = bfin_read_EMAC_PTP_TIMELO();
921         hi = bfin_read_EMAC_PTP_TIMEHI();
922 
923         ns = ((u64) hi) << 32;
924         ns |= lo;
925         ns <<= lp->shift;
926 
927         return ns;
928 }
929 
930 static void bfin_ptp_time_write(struct bfin_mac_local *lp, u64 ns)
931 {
932         u32 hi, lo;
933 
934         ns >>= lp->shift;
935         hi = ns >> 32;
936         lo = ns & 0xffffffff;
937 
938         bfin_write_EMAC_PTP_TIMELO(lo);
939         bfin_write_EMAC_PTP_TIMEHI(hi);
940 }
941 
942 /* PTP Hardware Clock operations */
943 
944 static int bfin_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
945 {
946         u64 adj;
947         u32 diff, addend;
948         int neg_adj = 0;
949         struct bfin_mac_local *lp =
950                 container_of(ptp, struct bfin_mac_local, caps);
951 
952         if (ppb < 0) {
953                 neg_adj = 1;
954                 ppb = -ppb;
955         }
956         addend = lp->addend;
957         adj = addend;
958         adj *= ppb;
959         diff = div_u64(adj, 1000000000ULL);
960 
961         addend = neg_adj ? addend - diff : addend + diff;
962 
963         bfin_write_EMAC_PTP_ADDEND(addend);
964 
965         return 0;
966 }
967 
968 static int bfin_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
969 {
970         s64 now;
971         unsigned long flags;
972         struct bfin_mac_local *lp =
973                 container_of(ptp, struct bfin_mac_local, caps);
974 
975         spin_lock_irqsave(&lp->phc_lock, flags);
976 
977         now = bfin_ptp_time_read(lp);
978         now += delta;
979         bfin_ptp_time_write(lp, now);
980 
981         spin_unlock_irqrestore(&lp->phc_lock, flags);
982 
983         return 0;
984 }
985 
986 static int bfin_ptp_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
987 {
988         u64 ns;
989         u32 remainder;
990         unsigned long flags;
991         struct bfin_mac_local *lp =
992                 container_of(ptp, struct bfin_mac_local, caps);
993 
994         spin_lock_irqsave(&lp->phc_lock, flags);
995 
996         ns = bfin_ptp_time_read(lp);
997 
998         spin_unlock_irqrestore(&lp->phc_lock, flags);
999 
1000         ts->tv_sec = div_u64_rem(ns, 1000000000, &remainder);
1001         ts->tv_nsec = remainder;
1002         return 0;
1003 }
1004 
1005 static int bfin_ptp_settime(struct ptp_clock_info *ptp,
1006                            const struct timespec *ts)
1007 {
1008         u64 ns;
1009         unsigned long flags;
1010         struct bfin_mac_local *lp =
1011                 container_of(ptp, struct bfin_mac_local, caps);
1012 
1013         ns = ts->tv_sec * 1000000000ULL;
1014         ns += ts->tv_nsec;
1015 
1016         spin_lock_irqsave(&lp->phc_lock, flags);
1017 
1018         bfin_ptp_time_write(lp, ns);
1019 
1020         spin_unlock_irqrestore(&lp->phc_lock, flags);
1021 
1022         return 0;
1023 }
1024 
1025 static int bfin_ptp_enable(struct ptp_clock_info *ptp,
1026                           struct ptp_clock_request *rq, int on)
1027 {
1028         return -EOPNOTSUPP;
1029 }
1030 
1031 static struct ptp_clock_info bfin_ptp_caps = {
1032         .owner          = THIS_MODULE,
1033         .name           = "BF518 clock",
1034         .max_adj        = 0,
1035         .n_alarm        = 0,
1036         .n_ext_ts       = 0,
1037         .n_per_out      = 0,
1038         .n_pins         = 0,
1039         .pps            = 0,
1040         .adjfreq        = bfin_ptp_adjfreq,
1041         .adjtime        = bfin_ptp_adjtime,
1042         .gettime        = bfin_ptp_gettime,
1043         .settime        = bfin_ptp_settime,
1044         .enable         = bfin_ptp_enable,
1045 };
1046 
1047 static int bfin_phc_init(struct net_device *netdev, struct device *dev)
1048 {
1049         struct bfin_mac_local *lp = netdev_priv(netdev);
1050 
1051         lp->caps = bfin_ptp_caps;
1052         lp->caps.max_adj = lp->max_ppb;
1053         lp->clock = ptp_clock_register(&lp->caps, dev);
1054         if (IS_ERR(lp->clock))
1055                 return PTR_ERR(lp->clock);
1056 
1057         lp->phc_index = ptp_clock_index(lp->clock);
1058         spin_lock_init(&lp->phc_lock);
1059 
1060         return 0;
1061 }
1062 
1063 static void bfin_phc_release(struct bfin_mac_local *lp)
1064 {
1065         ptp_clock_unregister(lp->clock);
1066 }
1067 
1068 #else
1069 # define bfin_mac_hwtstamp_is_none(cfg) 0
1070 # define bfin_mac_hwtstamp_init(dev)
1071 # define bfin_mac_hwtstamp_set(dev, ifr) (-EOPNOTSUPP)
1072 # define bfin_mac_hwtstamp_get(dev, ifr) (-EOPNOTSUPP)
1073 # define bfin_rx_hwtstamp(dev, skb)
1074 # define bfin_tx_hwtstamp(dev, skb)
1075 # define bfin_phc_init(netdev, dev) 0
1076 # define bfin_phc_release(lp)
1077 #endif
1078 
1079 static inline void _tx_reclaim_skb(void)
1080 {
1081         do {
1082                 tx_list_head->desc_a.config &= ~DMAEN;
1083                 tx_list_head->status.status_word = 0;
1084                 if (tx_list_head->skb) {
1085                         dev_consume_skb_any(tx_list_head->skb);
1086                         tx_list_head->skb = NULL;
1087                 }
1088                 tx_list_head = tx_list_head->next;
1089 
1090         } while (tx_list_head->status.status_word != 0);
1091 }
1092 
1093 static void tx_reclaim_skb(struct bfin_mac_local *lp)
1094 {
1095         int timeout_cnt = MAX_TIMEOUT_CNT;
1096 
1097         if (tx_list_head->status.status_word != 0)
1098                 _tx_reclaim_skb();
1099 
1100         if (current_tx_ptr->next == tx_list_head) {
1101                 while (tx_list_head->status.status_word == 0) {
1102                         /* slow down polling to avoid too many queue stop. */
1103                         udelay(10);
1104                         /* reclaim skb if DMA is not running. */
1105                         if (!(bfin_read_DMA2_IRQ_STATUS() & DMA_RUN))
1106                                 break;
1107                         if (timeout_cnt-- < 0)
1108                                 break;
1109                 }
1110 
1111                 if (timeout_cnt >= 0)
1112                         _tx_reclaim_skb();
1113                 else
1114                         netif_stop_queue(lp->ndev);
1115         }
1116 
1117         if (current_tx_ptr->next != tx_list_head &&
1118                 netif_queue_stopped(lp->ndev))
1119                 netif_wake_queue(lp->ndev);
1120 
1121         if (tx_list_head != current_tx_ptr) {
1122                 /* shorten the timer interval if tx queue is stopped */
1123                 if (netif_queue_stopped(lp->ndev))
1124                         lp->tx_reclaim_timer.expires =
1125                                 jiffies + (TX_RECLAIM_JIFFIES >> 4);
1126                 else
1127                         lp->tx_reclaim_timer.expires =
1128                                 jiffies + TX_RECLAIM_JIFFIES;
1129 
1130                 mod_timer(&lp->tx_reclaim_timer,
1131                         lp->tx_reclaim_timer.expires);
1132         }
1133 
1134         return;
1135 }
1136 
1137 static void tx_reclaim_skb_timeout(unsigned long lp)
1138 {
1139         tx_reclaim_skb((struct bfin_mac_local *)lp);
1140 }
1141 
1142 static int bfin_mac_hard_start_xmit(struct sk_buff *skb,
1143                                 struct net_device *dev)
1144 {
1145         struct bfin_mac_local *lp = netdev_priv(dev);
1146         u16 *data;
1147         u32 data_align = (unsigned long)(skb->data) & 0x3;
1148 
1149         current_tx_ptr->skb = skb;
1150 
1151         if (data_align == 0x2) {
1152                 /* move skb->data to current_tx_ptr payload */
1153                 data = (u16 *)(skb->data) - 1;
1154                 *data = (u16)(skb->len);
1155                 /*
1156                  * When transmitting an Ethernet packet, the PTP_TSYNC module requires
1157                  * a DMA_Length_Word field associated with the packet. The lower 12 bits
1158                  * of this field are the length of the packet payload in bytes and the higher
1159                  * 4 bits are the timestamping enable field.
1160                  */
1161                 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)
1162                         *data |= 0x1000;
1163 
1164                 current_tx_ptr->desc_a.start_addr = (u32)data;
1165                 /* this is important! */
1166                 blackfin_dcache_flush_range((u32)data,
1167                                 (u32)((u8 *)data + skb->len + 4));
1168         } else {
1169                 *((u16 *)(current_tx_ptr->packet)) = (u16)(skb->len);
1170                 /* enable timestamping for the sent packet */
1171                 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)
1172                         *((u16 *)(current_tx_ptr->packet)) |= 0x1000;
1173                 memcpy((u8 *)(current_tx_ptr->packet + 2), skb->data,
1174                         skb->len);
1175                 current_tx_ptr->desc_a.start_addr =
1176                         (u32)current_tx_ptr->packet;
1177                 blackfin_dcache_flush_range(
1178                         (u32)current_tx_ptr->packet,
1179                         (u32)(current_tx_ptr->packet + skb->len + 2));
1180         }
1181 
1182         /* make sure the internal data buffers in the core are drained
1183          * so that the DMA descriptors are completely written when the
1184          * DMA engine goes to fetch them below
1185          */
1186         SSYNC();
1187 
1188         /* always clear status buffer before start tx dma */
1189         current_tx_ptr->status.status_word = 0;
1190 
1191         /* enable this packet's dma */
1192         current_tx_ptr->desc_a.config |= DMAEN;
1193 
1194         /* tx dma is running, just return */
1195         if (bfin_read_DMA2_IRQ_STATUS() & DMA_RUN)
1196                 goto out;
1197 
1198         /* tx dma is not running */
1199         bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
1200         /* dma enabled, read from memory, size is 6 */
1201         bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config);
1202         /* Turn on the EMAC tx */
1203         bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
1204 
1205 out:
1206         bfin_tx_hwtstamp(dev, skb);
1207 
1208         current_tx_ptr = current_tx_ptr->next;
1209         dev->stats.tx_packets++;
1210         dev->stats.tx_bytes += (skb->len);
1211 
1212         tx_reclaim_skb(lp);
1213 
1214         return NETDEV_TX_OK;
1215 }
1216 
1217 #define IP_HEADER_OFF  0
1218 #define RX_ERROR_MASK (RX_LONG | RX_ALIGN | RX_CRC | RX_LEN | \
1219         RX_FRAG | RX_ADDR | RX_DMAO | RX_PHY | RX_LATE | RX_RANGE)
1220 
1221 static void bfin_mac_rx(struct bfin_mac_local *lp)
1222 {
1223         struct net_device *dev = lp->ndev;
1224         struct sk_buff *skb, *new_skb;
1225         unsigned short len;
1226 #if defined(BFIN_MAC_CSUM_OFFLOAD)
1227         unsigned int i;
1228         unsigned char fcs[ETH_FCS_LEN + 1];
1229 #endif
1230 
1231         /* check if frame status word reports an error condition
1232          * we which case we simply drop the packet
1233          */
1234         if (current_rx_ptr->status.status_word & RX_ERROR_MASK) {
1235                 netdev_notice(dev, "rx: receive error - packet dropped\n");
1236                 dev->stats.rx_dropped++;
1237                 goto out;
1238         }
1239 
1240         /* allocate a new skb for next time receive */
1241         skb = current_rx_ptr->skb;
1242 
1243         new_skb = netdev_alloc_skb(dev, PKT_BUF_SZ + NET_IP_ALIGN);
1244         if (!new_skb) {
1245                 dev->stats.rx_dropped++;
1246                 goto out;
1247         }
1248         /* reserve 2 bytes for RXDWA padding */
1249         skb_reserve(new_skb, NET_IP_ALIGN);
1250         /* Invidate the data cache of skb->data range when it is write back
1251          * cache. It will prevent overwritting the new data from DMA
1252          */
1253         blackfin_dcache_invalidate_range((unsigned long)new_skb->head,
1254                                          (unsigned long)new_skb->end);
1255 
1256         current_rx_ptr->skb = new_skb;
1257         current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
1258 
1259         len = (unsigned short)(current_rx_ptr->status.status_word & RX_FRLEN);
1260         /* Deduce Ethernet FCS length from Ethernet payload length */
1261         len -= ETH_FCS_LEN;
1262         skb_put(skb, len);
1263 
1264         skb->protocol = eth_type_trans(skb, dev);
1265 
1266         bfin_rx_hwtstamp(dev, skb);
1267 
1268 #if defined(BFIN_MAC_CSUM_OFFLOAD)
1269         /* Checksum offloading only works for IPv4 packets with the standard IP header
1270          * length of 20 bytes, because the blackfin MAC checksum calculation is
1271          * based on that assumption. We must NOT use the calculated checksum if our
1272          * IP version or header break that assumption.
1273          */
1274         if (skb->data[IP_HEADER_OFF] == 0x45) {
1275                 skb->csum = current_rx_ptr->status.ip_payload_csum;
1276                 /*
1277                  * Deduce Ethernet FCS from hardware generated IP payload checksum.
1278                  * IP checksum is based on 16-bit one's complement algorithm.
1279                  * To deduce a value from checksum is equal to add its inversion.
1280                  * If the IP payload len is odd, the inversed FCS should also
1281                  * begin from odd address and leave first byte zero.
1282                  */
1283                 if (skb->len % 2) {
1284                         fcs[0] = 0;
1285                         for (i = 0; i < ETH_FCS_LEN; i++)
1286                                 fcs[i + 1] = ~skb->data[skb->len + i];
1287                         skb->csum = csum_partial(fcs, ETH_FCS_LEN + 1, skb->csum);
1288                 } else {
1289                         for (i = 0; i < ETH_FCS_LEN; i++)
1290                                 fcs[i] = ~skb->data[skb->len + i];
1291                         skb->csum = csum_partial(fcs, ETH_FCS_LEN, skb->csum);
1292                 }
1293                 skb->ip_summed = CHECKSUM_COMPLETE;
1294         }
1295 #endif
1296 
1297         napi_gro_receive(&lp->napi, skb);
1298 
1299         dev->stats.rx_packets++;
1300         dev->stats.rx_bytes += len;
1301 out:
1302         current_rx_ptr->status.status_word = 0x00000000;
1303         current_rx_ptr = current_rx_ptr->next;
1304 }
1305 
1306 static int bfin_mac_poll(struct napi_struct *napi, int budget)
1307 {
1308         int i = 0;
1309         struct bfin_mac_local *lp = container_of(napi,
1310                                                  struct bfin_mac_local,
1311                                                  napi);
1312 
1313         while (current_rx_ptr->status.status_word != 0 && i < budget) {
1314                 bfin_mac_rx(lp);
1315                 i++;
1316         }
1317 
1318         if (i < budget) {
1319                 napi_complete(napi);
1320                 if (test_and_clear_bit(BFIN_MAC_RX_IRQ_DISABLED, &lp->flags))
1321                         enable_irq(IRQ_MAC_RX);
1322         }
1323 
1324         return i;
1325 }
1326 
1327 /* interrupt routine to handle rx and error signal */
1328 static irqreturn_t bfin_mac_interrupt(int irq, void *dev_id)
1329 {
1330         struct bfin_mac_local *lp = netdev_priv(dev_id);
1331         u32 status;
1332 
1333         status = bfin_read_DMA1_IRQ_STATUS();
1334 
1335         bfin_write_DMA1_IRQ_STATUS(status | DMA_DONE | DMA_ERR);
1336         if (status & DMA_DONE) {
1337                 disable_irq_nosync(IRQ_MAC_RX);
1338                 set_bit(BFIN_MAC_RX_IRQ_DISABLED, &lp->flags);
1339                 napi_schedule(&lp->napi);
1340         }
1341 
1342         return IRQ_HANDLED;
1343 }
1344 
1345 #ifdef CONFIG_NET_POLL_CONTROLLER
1346 static void bfin_mac_poll_controller(struct net_device *dev)
1347 {
1348         struct bfin_mac_local *lp = netdev_priv(dev);
1349 
1350         bfin_mac_interrupt(IRQ_MAC_RX, dev);
1351         tx_reclaim_skb(lp);
1352 }
1353 #endif                          /* CONFIG_NET_POLL_CONTROLLER */
1354 
1355 static void bfin_mac_disable(void)
1356 {
1357         unsigned int opmode;
1358 
1359         opmode = bfin_read_EMAC_OPMODE();
1360         opmode &= (~RE);
1361         opmode &= (~TE);
1362         /* Turn off the EMAC */
1363         bfin_write_EMAC_OPMODE(opmode);
1364 }
1365 
1366 /*
1367  * Enable Interrupts, Receive, and Transmit
1368  */
1369 static int bfin_mac_enable(struct phy_device *phydev)
1370 {
1371         int ret;
1372         u32 opmode;
1373 
1374         pr_debug("%s\n", __func__);
1375 
1376         /* Set RX DMA */
1377         bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
1378         bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config);
1379 
1380         /* Wait MII done */
1381         ret = bfin_mdio_poll();
1382         if (ret)
1383                 return ret;
1384 
1385         /* We enable only RX here */
1386         /* ASTP   : Enable Automatic Pad Stripping
1387            PR     : Promiscuous Mode for test
1388            PSF    : Receive frames with total length less than 64 bytes.
1389            FDMODE : Full Duplex Mode
1390            LB     : Internal Loopback for test
1391            RE     : Receiver Enable */
1392         opmode = bfin_read_EMAC_OPMODE();
1393         if (opmode & FDMODE)
1394                 opmode |= PSF;
1395         else
1396                 opmode |= DRO | DC | PSF;
1397         opmode |= RE;
1398 
1399         if (phydev->interface == PHY_INTERFACE_MODE_RMII) {
1400                 opmode |= RMII; /* For Now only 100MBit are supported */
1401 #if defined(CONFIG_BF537) || defined(CONFIG_BF536)
1402                 if (__SILICON_REVISION__ < 3) {
1403                         /*
1404                          * This isn't publicly documented (fun times!), but in
1405                          * silicon <=0.2, the RX and TX pins are clocked together.
1406                          * So in order to recv, we must enable the transmit side
1407                          * as well.  This will cause a spurious TX interrupt too,
1408                          * but we can easily consume that.
1409                          */
1410                         opmode |= TE;
1411                 }
1412 #endif
1413         }
1414 
1415         /* Turn on the EMAC rx */
1416         bfin_write_EMAC_OPMODE(opmode);
1417 
1418         return 0;
1419 }
1420 
1421 /* Our watchdog timed out. Called by the networking layer */
1422 static void bfin_mac_timeout(struct net_device *dev)
1423 {
1424         struct bfin_mac_local *lp = netdev_priv(dev);
1425 
1426         pr_debug("%s: %s\n", dev->name, __func__);
1427 
1428         bfin_mac_disable();
1429 
1430         del_timer(&lp->tx_reclaim_timer);
1431 
1432         /* reset tx queue and free skb */
1433         while (tx_list_head != current_tx_ptr) {
1434                 tx_list_head->desc_a.config &= ~DMAEN;
1435                 tx_list_head->status.status_word = 0;
1436                 if (tx_list_head->skb) {
1437                         dev_kfree_skb(tx_list_head->skb);
1438                         tx_list_head->skb = NULL;
1439                 }
1440                 tx_list_head = tx_list_head->next;
1441         }
1442 
1443         if (netif_queue_stopped(dev))
1444                 netif_wake_queue(dev);
1445 
1446         bfin_mac_enable(lp->phydev);
1447 
1448         /* We can accept TX packets again */
1449         dev->trans_start = jiffies; /* prevent tx timeout */
1450 }
1451 
1452 static void bfin_mac_multicast_hash(struct net_device *dev)
1453 {
1454         u32 emac_hashhi, emac_hashlo;
1455         struct netdev_hw_addr *ha;
1456         u32 crc;
1457 
1458         emac_hashhi = emac_hashlo = 0;
1459 
1460         netdev_for_each_mc_addr(ha, dev) {
1461                 crc = ether_crc(ETH_ALEN, ha->addr);
1462                 crc >>= 26;
1463 
1464                 if (crc & 0x20)
1465                         emac_hashhi |= 1 << (crc & 0x1f);
1466                 else
1467                         emac_hashlo |= 1 << (crc & 0x1f);
1468         }
1469 
1470         bfin_write_EMAC_HASHHI(emac_hashhi);
1471         bfin_write_EMAC_HASHLO(emac_hashlo);
1472 }
1473 
1474 /*
1475  * This routine will, depending on the values passed to it,
1476  * either make it accept multicast packets, go into
1477  * promiscuous mode (for TCPDUMP and cousins) or accept
1478  * a select set of multicast packets
1479  */
1480 static void bfin_mac_set_multicast_list(struct net_device *dev)
1481 {
1482         u32 sysctl;
1483 
1484         if (dev->flags & IFF_PROMISC) {
1485                 netdev_info(dev, "set promisc mode\n");
1486                 sysctl = bfin_read_EMAC_OPMODE();
1487                 sysctl |= PR;
1488                 bfin_write_EMAC_OPMODE(sysctl);
1489         } else if (dev->flags & IFF_ALLMULTI) {
1490                 /* accept all multicast */
1491                 sysctl = bfin_read_EMAC_OPMODE();
1492                 sysctl |= PAM;
1493                 bfin_write_EMAC_OPMODE(sysctl);
1494         } else if (!netdev_mc_empty(dev)) {
1495                 /* set up multicast hash table */
1496                 sysctl = bfin_read_EMAC_OPMODE();
1497                 sysctl |= HM;
1498                 bfin_write_EMAC_OPMODE(sysctl);
1499                 bfin_mac_multicast_hash(dev);
1500         } else {
1501                 /* clear promisc or multicast mode */
1502                 sysctl = bfin_read_EMAC_OPMODE();
1503                 sysctl &= ~(RAF | PAM);
1504                 bfin_write_EMAC_OPMODE(sysctl);
1505         }
1506 }
1507 
1508 static int bfin_mac_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
1509 {
1510         struct bfin_mac_local *lp = netdev_priv(netdev);
1511 
1512         if (!netif_running(netdev))
1513                 return -EINVAL;
1514 
1515         switch (cmd) {
1516         case SIOCSHWTSTAMP:
1517                 return bfin_mac_hwtstamp_set(netdev, ifr);
1518         case SIOCGHWTSTAMP:
1519                 return bfin_mac_hwtstamp_get(netdev, ifr);
1520         default:
1521                 if (lp->phydev)
1522                         return phy_mii_ioctl(lp->phydev, ifr, cmd);
1523                 else
1524                         return -EOPNOTSUPP;
1525         }
1526 }
1527 
1528 /*
1529  * this puts the device in an inactive state
1530  */
1531 static void bfin_mac_shutdown(struct net_device *dev)
1532 {
1533         /* Turn off the EMAC */
1534         bfin_write_EMAC_OPMODE(0x00000000);
1535         /* Turn off the EMAC RX DMA */
1536         bfin_write_DMA1_CONFIG(0x0000);
1537         bfin_write_DMA2_CONFIG(0x0000);
1538 }
1539 
1540 /*
1541  * Open and Initialize the interface
1542  *
1543  * Set up everything, reset the card, etc..
1544  */
1545 static int bfin_mac_open(struct net_device *dev)
1546 {
1547         struct bfin_mac_local *lp = netdev_priv(dev);
1548         int ret;
1549         pr_debug("%s: %s\n", dev->name, __func__);
1550 
1551         /*
1552          * Check that the address is valid.  If its not, refuse
1553          * to bring the device up.  The user must specify an
1554          * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
1555          */
1556         if (!is_valid_ether_addr(dev->dev_addr)) {
1557                 netdev_warn(dev, "no valid ethernet hw addr\n");
1558                 return -EINVAL;
1559         }
1560 
1561         /* initial rx and tx list */
1562         ret = desc_list_init(dev);
1563         if (ret)
1564                 return ret;
1565 
1566         phy_start(lp->phydev);
1567         setup_system_regs(dev);
1568         setup_mac_addr(dev->dev_addr);
1569 
1570         bfin_mac_disable();
1571         ret = bfin_mac_enable(lp->phydev);
1572         if (ret)
1573                 return ret;
1574         pr_debug("hardware init finished\n");
1575 
1576         napi_enable(&lp->napi);
1577         netif_start_queue(dev);
1578         netif_carrier_on(dev);
1579 
1580         return 0;
1581 }
1582 
1583 /*
1584  * this makes the board clean up everything that it can
1585  * and not talk to the outside world.   Caused by
1586  * an 'ifconfig ethX down'
1587  */
1588 static int bfin_mac_close(struct net_device *dev)
1589 {
1590         struct bfin_mac_local *lp = netdev_priv(dev);
1591         pr_debug("%s: %s\n", dev->name, __func__);
1592 
1593         netif_stop_queue(dev);
1594         napi_disable(&lp->napi);
1595         netif_carrier_off(dev);
1596 
1597         phy_stop(lp->phydev);
1598         phy_write(lp->phydev, MII_BMCR, BMCR_PDOWN);
1599 
1600         /* clear everything */
1601         bfin_mac_shutdown(dev);
1602 
1603         /* free the rx/tx buffers */
1604         desc_list_free();
1605 
1606         return 0;
1607 }
1608 
1609 static const struct net_device_ops bfin_mac_netdev_ops = {
1610         .ndo_open               = bfin_mac_open,
1611         .ndo_stop               = bfin_mac_close,
1612         .ndo_start_xmit         = bfin_mac_hard_start_xmit,
1613         .ndo_set_mac_address    = bfin_mac_set_mac_address,
1614         .ndo_tx_timeout         = bfin_mac_timeout,
1615         .ndo_set_rx_mode        = bfin_mac_set_multicast_list,
1616         .ndo_do_ioctl           = bfin_mac_ioctl,
1617         .ndo_validate_addr      = eth_validate_addr,
1618         .ndo_change_mtu         = eth_change_mtu,
1619 #ifdef CONFIG_NET_POLL_CONTROLLER
1620         .ndo_poll_controller    = bfin_mac_poll_controller,
1621 #endif
1622 };
1623 
1624 static int bfin_mac_probe(struct platform_device *pdev)
1625 {
1626         struct net_device *ndev;
1627         struct bfin_mac_local *lp;
1628         struct platform_device *pd;
1629         struct bfin_mii_bus_platform_data *mii_bus_data;
1630         int rc;
1631 
1632         ndev = alloc_etherdev(sizeof(struct bfin_mac_local));
1633         if (!ndev)
1634                 return -ENOMEM;
1635 
1636         SET_NETDEV_DEV(ndev, &pdev->dev);
1637         platform_set_drvdata(pdev, ndev);
1638         lp = netdev_priv(ndev);
1639         lp->ndev = ndev;
1640 
1641         /* Grab the MAC address in the MAC */
1642         *(__le32 *) (&(ndev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
1643         *(__le16 *) (&(ndev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());
1644 
1645         /* probe mac */
1646         /*todo: how to proble? which is revision_register */
1647         bfin_write_EMAC_ADDRLO(0x12345678);
1648         if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
1649                 dev_err(&pdev->dev, "Cannot detect Blackfin on-chip ethernet MAC controller!\n");
1650                 rc = -ENODEV;
1651                 goto out_err_probe_mac;
1652         }
1653 
1654 
1655         /*
1656          * Is it valid? (Did bootloader initialize it?)
1657          * Grab the MAC from the board somehow
1658          * this is done in the arch/blackfin/mach-bfxxx/boards/eth_mac.c
1659          */
1660         if (!is_valid_ether_addr(ndev->dev_addr)) {
1661                 if (bfin_get_ether_addr(ndev->dev_addr) ||
1662                      !is_valid_ether_addr(ndev->dev_addr)) {
1663                         /* Still not valid, get a random one */
1664                         netdev_warn(ndev, "Setting Ethernet MAC to a random one\n");
1665                         eth_hw_addr_random(ndev);
1666                 }
1667         }
1668 
1669         setup_mac_addr(ndev->dev_addr);
1670 
1671         if (!dev_get_platdata(&pdev->dev)) {
1672                 dev_err(&pdev->dev, "Cannot get platform device bfin_mii_bus!\n");
1673                 rc = -ENODEV;
1674                 goto out_err_probe_mac;
1675         }
1676         pd = dev_get_platdata(&pdev->dev);
1677         lp->mii_bus = platform_get_drvdata(pd);
1678         if (!lp->mii_bus) {
1679                 dev_err(&pdev->dev, "Cannot get mii_bus!\n");
1680                 rc = -ENODEV;
1681                 goto out_err_probe_mac;
1682         }
1683         lp->mii_bus->priv = ndev;
1684         mii_bus_data = dev_get_platdata(&pd->dev);
1685 
1686         rc = mii_probe(ndev, mii_bus_data->phy_mode);
1687         if (rc) {
1688                 dev_err(&pdev->dev, "MII Probe failed!\n");
1689                 goto out_err_mii_probe;
1690         }
1691 
1692         lp->vlan1_mask = ETH_P_8021Q | mii_bus_data->vlan1_mask;
1693         lp->vlan2_mask = ETH_P_8021Q | mii_bus_data->vlan2_mask;
1694 
1695         ndev->netdev_ops = &bfin_mac_netdev_ops;
1696         ndev->ethtool_ops = &bfin_mac_ethtool_ops;
1697 
1698         init_timer(&lp->tx_reclaim_timer);
1699         lp->tx_reclaim_timer.data = (unsigned long)lp;
1700         lp->tx_reclaim_timer.function = tx_reclaim_skb_timeout;
1701 
1702         lp->flags = 0;
1703         netif_napi_add(ndev, &lp->napi, bfin_mac_poll, CONFIG_BFIN_RX_DESC_NUM);
1704 
1705         spin_lock_init(&lp->lock);
1706 
1707         /* now, enable interrupts */
1708         /* register irq handler */
1709         rc = request_irq(IRQ_MAC_RX, bfin_mac_interrupt,
1710                         0, "EMAC_RX", ndev);
1711         if (rc) {
1712                 dev_err(&pdev->dev, "Cannot request Blackfin MAC RX IRQ!\n");
1713                 rc = -EBUSY;
1714                 goto out_err_request_irq;
1715         }
1716 
1717         rc = register_netdev(ndev);
1718         if (rc) {
1719                 dev_err(&pdev->dev, "Cannot register net device!\n");
1720                 goto out_err_reg_ndev;
1721         }
1722 
1723         bfin_mac_hwtstamp_init(ndev);
1724         rc = bfin_phc_init(ndev, &pdev->dev);
1725         if (rc) {
1726                 dev_err(&pdev->dev, "Cannot register PHC device!\n");
1727                 goto out_err_phc;
1728         }
1729 
1730         /* now, print out the card info, in a short format.. */
1731         netdev_info(ndev, "%s, Version %s\n", DRV_DESC, DRV_VERSION);
1732 
1733         return 0;
1734 
1735 out_err_phc:
1736 out_err_reg_ndev:
1737         free_irq(IRQ_MAC_RX, ndev);
1738 out_err_request_irq:
1739         netif_napi_del(&lp->napi);
1740 out_err_mii_probe:
1741         mdiobus_unregister(lp->mii_bus);
1742         mdiobus_free(lp->mii_bus);
1743 out_err_probe_mac:
1744         free_netdev(ndev);
1745 
1746         return rc;
1747 }
1748 
1749 static int bfin_mac_remove(struct platform_device *pdev)
1750 {
1751         struct net_device *ndev = platform_get_drvdata(pdev);
1752         struct bfin_mac_local *lp = netdev_priv(ndev);
1753 
1754         bfin_phc_release(lp);
1755 
1756         lp->mii_bus->priv = NULL;
1757 
1758         unregister_netdev(ndev);
1759 
1760         netif_napi_del(&lp->napi);
1761 
1762         free_irq(IRQ_MAC_RX, ndev);
1763 
1764         free_netdev(ndev);
1765 
1766         return 0;
1767 }
1768 
1769 #ifdef CONFIG_PM
1770 static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t mesg)
1771 {
1772         struct net_device *net_dev = platform_get_drvdata(pdev);
1773         struct bfin_mac_local *lp = netdev_priv(net_dev);
1774 
1775         if (lp->wol) {
1776                 bfin_write_EMAC_OPMODE((bfin_read_EMAC_OPMODE() & ~TE) | RE);
1777                 bfin_write_EMAC_WKUP_CTL(MPKE);
1778                 enable_irq_wake(IRQ_MAC_WAKEDET);
1779         } else {
1780                 if (netif_running(net_dev))
1781                         bfin_mac_close(net_dev);
1782         }
1783 
1784         return 0;
1785 }
1786 
1787 static int bfin_mac_resume(struct platform_device *pdev)
1788 {
1789         struct net_device *net_dev = platform_get_drvdata(pdev);
1790         struct bfin_mac_local *lp = netdev_priv(net_dev);
1791 
1792         if (lp->wol) {
1793                 bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
1794                 bfin_write_EMAC_WKUP_CTL(0);
1795                 disable_irq_wake(IRQ_MAC_WAKEDET);
1796         } else {
1797                 if (netif_running(net_dev))
1798                         bfin_mac_open(net_dev);
1799         }
1800 
1801         return 0;
1802 }
1803 #else
1804 #define bfin_mac_suspend NULL
1805 #define bfin_mac_resume NULL
1806 #endif  /* CONFIG_PM */
1807 
1808 static int bfin_mii_bus_probe(struct platform_device *pdev)
1809 {
1810         struct mii_bus *miibus;
1811         struct bfin_mii_bus_platform_data *mii_bus_pd;
1812         const unsigned short *pin_req;
1813         int rc, i;
1814 
1815         mii_bus_pd = dev_get_platdata(&pdev->dev);
1816         if (!mii_bus_pd) {
1817                 dev_err(&pdev->dev, "No peripherals in platform data!\n");
1818                 return -EINVAL;
1819         }
1820 
1821         /*
1822          * We are setting up a network card,
1823          * so set the GPIO pins to Ethernet mode
1824          */
1825         pin_req = mii_bus_pd->mac_peripherals;
1826         rc = peripheral_request_list(pin_req, KBUILD_MODNAME);
1827         if (rc) {
1828                 dev_err(&pdev->dev, "Requesting peripherals failed!\n");
1829                 return rc;
1830         }
1831 
1832         rc = -ENOMEM;
1833         miibus = mdiobus_alloc();
1834         if (miibus == NULL)
1835                 goto out_err_alloc;
1836         miibus->read = bfin_mdiobus_read;
1837         miibus->write = bfin_mdiobus_write;
1838 
1839         miibus->parent = &pdev->dev;
1840         miibus->name = "bfin_mii_bus";
1841         miibus->phy_mask = mii_bus_pd->phy_mask;
1842 
1843         snprintf(miibus->id, MII_BUS_ID_SIZE, "%s-%x",
1844                 pdev->name, pdev->id);
1845         miibus->irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
1846         if (!miibus->irq)
1847                 goto out_err_irq_alloc;
1848 
1849         for (i = rc; i < PHY_MAX_ADDR; ++i)
1850                 miibus->irq[i] = PHY_POLL;
1851 
1852         rc = clamp(mii_bus_pd->phydev_number, 0, PHY_MAX_ADDR);
1853         if (rc != mii_bus_pd->phydev_number)
1854                 dev_err(&pdev->dev, "Invalid number (%i) of phydevs\n",
1855                         mii_bus_pd->phydev_number);
1856         for (i = 0; i < rc; ++i) {
1857                 unsigned short phyaddr = mii_bus_pd->phydev_data[i].addr;
1858                 if (phyaddr < PHY_MAX_ADDR)
1859                         miibus->irq[phyaddr] = mii_bus_pd->phydev_data[i].irq;
1860                 else
1861                         dev_err(&pdev->dev,
1862                                 "Invalid PHY address %i for phydev %i\n",
1863                                 phyaddr, i);
1864         }
1865 
1866         rc = mdiobus_register(miibus);
1867         if (rc) {
1868                 dev_err(&pdev->dev, "Cannot register MDIO bus!\n");
1869                 goto out_err_mdiobus_register;
1870         }
1871 
1872         platform_set_drvdata(pdev, miibus);
1873         return 0;
1874 
1875 out_err_mdiobus_register:
1876         kfree(miibus->irq);
1877 out_err_irq_alloc:
1878         mdiobus_free(miibus);
1879 out_err_alloc:
1880         peripheral_free_list(pin_req);
1881 
1882         return rc;
1883 }
1884 
1885 static int bfin_mii_bus_remove(struct platform_device *pdev)
1886 {
1887         struct mii_bus *miibus = platform_get_drvdata(pdev);
1888         struct bfin_mii_bus_platform_data *mii_bus_pd =
1889                 dev_get_platdata(&pdev->dev);
1890 
1891         mdiobus_unregister(miibus);
1892         kfree(miibus->irq);
1893         mdiobus_free(miibus);
1894         peripheral_free_list(mii_bus_pd->mac_peripherals);
1895 
1896         return 0;
1897 }
1898 
1899 static struct platform_driver bfin_mii_bus_driver = {
1900         .probe = bfin_mii_bus_probe,
1901         .remove = bfin_mii_bus_remove,
1902         .driver = {
1903                 .name = "bfin_mii_bus",
1904                 .owner  = THIS_MODULE,
1905         },
1906 };
1907 
1908 static struct platform_driver bfin_mac_driver = {
1909         .probe = bfin_mac_probe,
1910         .remove = bfin_mac_remove,
1911         .resume = bfin_mac_resume,
1912         .suspend = bfin_mac_suspend,
1913         .driver = {
1914                 .name = KBUILD_MODNAME,
1915                 .owner  = THIS_MODULE,
1916         },
1917 };
1918 
1919 static int __init bfin_mac_init(void)
1920 {
1921         int ret;
1922         ret = platform_driver_register(&bfin_mii_bus_driver);
1923         if (!ret)
1924                 return platform_driver_register(&bfin_mac_driver);
1925         return -ENODEV;
1926 }
1927 
1928 module_init(bfin_mac_init);
1929 
1930 static void __exit bfin_mac_cleanup(void)
1931 {
1932         platform_driver_unregister(&bfin_mac_driver);
1933         platform_driver_unregister(&bfin_mii_bus_driver);
1934 }
1935 
1936 module_exit(bfin_mac_cleanup);
1937 
1938 

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