Version:  2.0.40 2.2.26 2.4.37 3.1 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

Linux/drivers/net/ethernet/altera/altera_tse_main.c

  1 /* Altera Triple-Speed Ethernet MAC driver
  2  * Copyright (C) 2008-2014 Altera Corporation. All rights reserved
  3  *
  4  * Contributors:
  5  *   Dalon Westergreen
  6  *   Thomas Chou
  7  *   Ian Abbott
  8  *   Yuriy Kozlov
  9  *   Tobias Klauser
 10  *   Andriy Smolskyy
 11  *   Roman Bulgakov
 12  *   Dmytro Mytarchuk
 13  *   Matthew Gerlach
 14  *
 15  * Original driver contributed by SLS.
 16  * Major updates contributed by GlobalLogic
 17  *
 18  * This program is free software; you can redistribute it and/or modify it
 19  * under the terms and conditions of the GNU General Public License,
 20  * version 2, as published by the Free Software Foundation.
 21  *
 22  * This program is distributed in the hope it will be useful, but WITHOUT
 23  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 24  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 25  * more details.
 26  *
 27  * You should have received a copy of the GNU General Public License along with
 28  * this program.  If not, see <http://www.gnu.org/licenses/>.
 29  */
 30 
 31 #include <linux/atomic.h>
 32 #include <linux/delay.h>
 33 #include <linux/etherdevice.h>
 34 #include <linux/if_vlan.h>
 35 #include <linux/init.h>
 36 #include <linux/interrupt.h>
 37 #include <linux/io.h>
 38 #include <linux/kernel.h>
 39 #include <linux/module.h>
 40 #include <linux/netdevice.h>
 41 #include <linux/of_device.h>
 42 #include <linux/of_mdio.h>
 43 #include <linux/of_net.h>
 44 #include <linux/of_platform.h>
 45 #include <linux/phy.h>
 46 #include <linux/platform_device.h>
 47 #include <linux/skbuff.h>
 48 #include <asm/cacheflush.h>
 49 
 50 #include "altera_utils.h"
 51 #include "altera_tse.h"
 52 #include "altera_sgdma.h"
 53 #include "altera_msgdma.h"
 54 
 55 static atomic_t instance_count = ATOMIC_INIT(~0);
 56 /* Module parameters */
 57 static int debug = -1;
 58 module_param(debug, int, S_IRUGO | S_IWUSR);
 59 MODULE_PARM_DESC(debug, "Message Level (-1: default, 0: no output, 16: all)");
 60 
 61 static const u32 default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
 62                                         NETIF_MSG_LINK | NETIF_MSG_IFUP |
 63                                         NETIF_MSG_IFDOWN);
 64 
 65 #define RX_DESCRIPTORS 64
 66 static int dma_rx_num = RX_DESCRIPTORS;
 67 module_param(dma_rx_num, int, S_IRUGO | S_IWUSR);
 68 MODULE_PARM_DESC(dma_rx_num, "Number of descriptors in the RX list");
 69 
 70 #define TX_DESCRIPTORS 64
 71 static int dma_tx_num = TX_DESCRIPTORS;
 72 module_param(dma_tx_num, int, S_IRUGO | S_IWUSR);
 73 MODULE_PARM_DESC(dma_tx_num, "Number of descriptors in the TX list");
 74 
 75 
 76 #define POLL_PHY (-1)
 77 
 78 /* Make sure DMA buffer size is larger than the max frame size
 79  * plus some alignment offset and a VLAN header. If the max frame size is
 80  * 1518, a VLAN header would be additional 4 bytes and additional
 81  * headroom for alignment is 2 bytes, 2048 is just fine.
 82  */
 83 #define ALTERA_RXDMABUFFER_SIZE 2048
 84 
 85 /* Allow network stack to resume queueing packets after we've
 86  * finished transmitting at least 1/4 of the packets in the queue.
 87  */
 88 #define TSE_TX_THRESH(x)        (x->tx_ring_size / 4)
 89 
 90 #define TXQUEUESTOP_THRESHHOLD  2
 91 
 92 static struct of_device_id altera_tse_ids[];
 93 
 94 static inline u32 tse_tx_avail(struct altera_tse_private *priv)
 95 {
 96         return priv->tx_cons + priv->tx_ring_size - priv->tx_prod - 1;
 97 }
 98 
 99 /* MDIO specific functions
100  */
101 static int altera_tse_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
102 {
103         struct net_device *ndev = bus->priv;
104         struct altera_tse_private *priv = netdev_priv(ndev);
105 
106         /* set MDIO address */
107         csrwr32((mii_id & 0x1f), priv->mac_dev,
108                 tse_csroffs(mdio_phy0_addr));
109 
110         /* get the data */
111         return csrrd32(priv->mac_dev,
112                        tse_csroffs(mdio_phy0) + regnum * 4) & 0xffff;
113 }
114 
115 static int altera_tse_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
116                                  u16 value)
117 {
118         struct net_device *ndev = bus->priv;
119         struct altera_tse_private *priv = netdev_priv(ndev);
120 
121         /* set MDIO address */
122         csrwr32((mii_id & 0x1f), priv->mac_dev,
123                 tse_csroffs(mdio_phy0_addr));
124 
125         /* write the data */
126         csrwr32(value, priv->mac_dev, tse_csroffs(mdio_phy0) + regnum * 4);
127         return 0;
128 }
129 
130 static int altera_tse_mdio_create(struct net_device *dev, unsigned int id)
131 {
132         struct altera_tse_private *priv = netdev_priv(dev);
133         int ret;
134         int i;
135         struct device_node *mdio_node = NULL;
136         struct mii_bus *mdio = NULL;
137         struct device_node *child_node = NULL;
138 
139         for_each_child_of_node(priv->device->of_node, child_node) {
140                 if (of_device_is_compatible(child_node, "altr,tse-mdio")) {
141                         mdio_node = child_node;
142                         break;
143                 }
144         }
145 
146         if (mdio_node) {
147                 netdev_dbg(dev, "FOUND MDIO subnode\n");
148         } else {
149                 netdev_dbg(dev, "NO MDIO subnode\n");
150                 return 0;
151         }
152 
153         mdio = mdiobus_alloc();
154         if (mdio == NULL) {
155                 netdev_err(dev, "Error allocating MDIO bus\n");
156                 return -ENOMEM;
157         }
158 
159         mdio->name = ALTERA_TSE_RESOURCE_NAME;
160         mdio->read = &altera_tse_mdio_read;
161         mdio->write = &altera_tse_mdio_write;
162         snprintf(mdio->id, MII_BUS_ID_SIZE, "%s-%u", mdio->name, id);
163 
164         mdio->irq = kcalloc(PHY_MAX_ADDR, sizeof(int), GFP_KERNEL);
165         if (mdio->irq == NULL) {
166                 ret = -ENOMEM;
167                 goto out_free_mdio;
168         }
169         for (i = 0; i < PHY_MAX_ADDR; i++)
170                 mdio->irq[i] = PHY_POLL;
171 
172         mdio->priv = dev;
173         mdio->parent = priv->device;
174 
175         ret = of_mdiobus_register(mdio, mdio_node);
176         if (ret != 0) {
177                 netdev_err(dev, "Cannot register MDIO bus %s\n",
178                            mdio->id);
179                 goto out_free_mdio_irq;
180         }
181 
182         if (netif_msg_drv(priv))
183                 netdev_info(dev, "MDIO bus %s: created\n", mdio->id);
184 
185         priv->mdio = mdio;
186         return 0;
187 out_free_mdio_irq:
188         kfree(mdio->irq);
189 out_free_mdio:
190         mdiobus_free(mdio);
191         mdio = NULL;
192         return ret;
193 }
194 
195 static void altera_tse_mdio_destroy(struct net_device *dev)
196 {
197         struct altera_tse_private *priv = netdev_priv(dev);
198 
199         if (priv->mdio == NULL)
200                 return;
201 
202         if (netif_msg_drv(priv))
203                 netdev_info(dev, "MDIO bus %s: removed\n",
204                             priv->mdio->id);
205 
206         mdiobus_unregister(priv->mdio);
207         kfree(priv->mdio->irq);
208         mdiobus_free(priv->mdio);
209         priv->mdio = NULL;
210 }
211 
212 static int tse_init_rx_buffer(struct altera_tse_private *priv,
213                               struct tse_buffer *rxbuffer, int len)
214 {
215         rxbuffer->skb = netdev_alloc_skb_ip_align(priv->dev, len);
216         if (!rxbuffer->skb)
217                 return -ENOMEM;
218 
219         rxbuffer->dma_addr = dma_map_single(priv->device, rxbuffer->skb->data,
220                                                 len,
221                                                 DMA_FROM_DEVICE);
222 
223         if (dma_mapping_error(priv->device, rxbuffer->dma_addr)) {
224                 netdev_err(priv->dev, "%s: DMA mapping error\n", __func__);
225                 dev_kfree_skb_any(rxbuffer->skb);
226                 return -EINVAL;
227         }
228         rxbuffer->dma_addr &= (dma_addr_t)~3;
229         rxbuffer->len = len;
230         return 0;
231 }
232 
233 static void tse_free_rx_buffer(struct altera_tse_private *priv,
234                                struct tse_buffer *rxbuffer)
235 {
236         struct sk_buff *skb = rxbuffer->skb;
237         dma_addr_t dma_addr = rxbuffer->dma_addr;
238 
239         if (skb != NULL) {
240                 if (dma_addr)
241                         dma_unmap_single(priv->device, dma_addr,
242                                          rxbuffer->len,
243                                          DMA_FROM_DEVICE);
244                 dev_kfree_skb_any(skb);
245                 rxbuffer->skb = NULL;
246                 rxbuffer->dma_addr = 0;
247         }
248 }
249 
250 /* Unmap and free Tx buffer resources
251  */
252 static void tse_free_tx_buffer(struct altera_tse_private *priv,
253                                struct tse_buffer *buffer)
254 {
255         if (buffer->dma_addr) {
256                 if (buffer->mapped_as_page)
257                         dma_unmap_page(priv->device, buffer->dma_addr,
258                                        buffer->len, DMA_TO_DEVICE);
259                 else
260                         dma_unmap_single(priv->device, buffer->dma_addr,
261                                          buffer->len, DMA_TO_DEVICE);
262                 buffer->dma_addr = 0;
263         }
264         if (buffer->skb) {
265                 dev_kfree_skb_any(buffer->skb);
266                 buffer->skb = NULL;
267         }
268 }
269 
270 static int alloc_init_skbufs(struct altera_tse_private *priv)
271 {
272         unsigned int rx_descs = priv->rx_ring_size;
273         unsigned int tx_descs = priv->tx_ring_size;
274         int ret = -ENOMEM;
275         int i;
276 
277         /* Create Rx ring buffer */
278         priv->rx_ring = kcalloc(rx_descs, sizeof(struct tse_buffer),
279                                 GFP_KERNEL);
280         if (!priv->rx_ring)
281                 goto err_rx_ring;
282 
283         /* Create Tx ring buffer */
284         priv->tx_ring = kcalloc(tx_descs, sizeof(struct tse_buffer),
285                                 GFP_KERNEL);
286         if (!priv->tx_ring)
287                 goto err_tx_ring;
288 
289         priv->tx_cons = 0;
290         priv->tx_prod = 0;
291 
292         /* Init Rx ring */
293         for (i = 0; i < rx_descs; i++) {
294                 ret = tse_init_rx_buffer(priv, &priv->rx_ring[i],
295                                          priv->rx_dma_buf_sz);
296                 if (ret)
297                         goto err_init_rx_buffers;
298         }
299 
300         priv->rx_cons = 0;
301         priv->rx_prod = 0;
302 
303         return 0;
304 err_init_rx_buffers:
305         while (--i >= 0)
306                 tse_free_rx_buffer(priv, &priv->rx_ring[i]);
307         kfree(priv->tx_ring);
308 err_tx_ring:
309         kfree(priv->rx_ring);
310 err_rx_ring:
311         return ret;
312 }
313 
314 static void free_skbufs(struct net_device *dev)
315 {
316         struct altera_tse_private *priv = netdev_priv(dev);
317         unsigned int rx_descs = priv->rx_ring_size;
318         unsigned int tx_descs = priv->tx_ring_size;
319         int i;
320 
321         /* Release the DMA TX/RX socket buffers */
322         for (i = 0; i < rx_descs; i++)
323                 tse_free_rx_buffer(priv, &priv->rx_ring[i]);
324         for (i = 0; i < tx_descs; i++)
325                 tse_free_tx_buffer(priv, &priv->tx_ring[i]);
326 
327 
328         kfree(priv->tx_ring);
329 }
330 
331 /* Reallocate the skb for the reception process
332  */
333 static inline void tse_rx_refill(struct altera_tse_private *priv)
334 {
335         unsigned int rxsize = priv->rx_ring_size;
336         unsigned int entry;
337         int ret;
338 
339         for (; priv->rx_cons - priv->rx_prod > 0;
340                         priv->rx_prod++) {
341                 entry = priv->rx_prod % rxsize;
342                 if (likely(priv->rx_ring[entry].skb == NULL)) {
343                         ret = tse_init_rx_buffer(priv, &priv->rx_ring[entry],
344                                 priv->rx_dma_buf_sz);
345                         if (unlikely(ret != 0))
346                                 break;
347                         priv->dmaops->add_rx_desc(priv, &priv->rx_ring[entry]);
348                 }
349         }
350 }
351 
352 /* Pull out the VLAN tag and fix up the packet
353  */
354 static inline void tse_rx_vlan(struct net_device *dev, struct sk_buff *skb)
355 {
356         struct ethhdr *eth_hdr;
357         u16 vid;
358         if ((dev->features & NETIF_F_HW_VLAN_CTAG_RX) &&
359             !__vlan_get_tag(skb, &vid)) {
360                 eth_hdr = (struct ethhdr *)skb->data;
361                 memmove(skb->data + VLAN_HLEN, eth_hdr, ETH_ALEN * 2);
362                 skb_pull(skb, VLAN_HLEN);
363                 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
364         }
365 }
366 
367 /* Receive a packet: retrieve and pass over to upper levels
368  */
369 static int tse_rx(struct altera_tse_private *priv, int limit)
370 {
371         unsigned int count = 0;
372         unsigned int next_entry;
373         struct sk_buff *skb;
374         unsigned int entry = priv->rx_cons % priv->rx_ring_size;
375         u32 rxstatus;
376         u16 pktlength;
377         u16 pktstatus;
378 
379         while ((rxstatus = priv->dmaops->get_rx_status(priv)) != 0) {
380                 pktstatus = rxstatus >> 16;
381                 pktlength = rxstatus & 0xffff;
382 
383                 if ((pktstatus & 0xFF) || (pktlength == 0))
384                         netdev_err(priv->dev,
385                                    "RCV pktstatus %08X pktlength %08X\n",
386                                    pktstatus, pktlength);
387 
388                 count++;
389                 next_entry = (++priv->rx_cons) % priv->rx_ring_size;
390 
391                 skb = priv->rx_ring[entry].skb;
392                 if (unlikely(!skb)) {
393                         netdev_err(priv->dev,
394                                    "%s: Inconsistent Rx descriptor chain\n",
395                                    __func__);
396                         priv->dev->stats.rx_dropped++;
397                         break;
398                 }
399                 priv->rx_ring[entry].skb = NULL;
400 
401                 skb_put(skb, pktlength);
402 
403                 /* make cache consistent with receive packet buffer */
404                 dma_sync_single_for_cpu(priv->device,
405                                         priv->rx_ring[entry].dma_addr,
406                                         priv->rx_ring[entry].len,
407                                         DMA_FROM_DEVICE);
408 
409                 dma_unmap_single(priv->device, priv->rx_ring[entry].dma_addr,
410                                  priv->rx_ring[entry].len, DMA_FROM_DEVICE);
411 
412                 if (netif_msg_pktdata(priv)) {
413                         netdev_info(priv->dev, "frame received %d bytes\n",
414                                     pktlength);
415                         print_hex_dump(KERN_ERR, "data: ", DUMP_PREFIX_OFFSET,
416                                        16, 1, skb->data, pktlength, true);
417                 }
418 
419                 tse_rx_vlan(priv->dev, skb);
420 
421                 skb->protocol = eth_type_trans(skb, priv->dev);
422                 skb_checksum_none_assert(skb);
423 
424                 napi_gro_receive(&priv->napi, skb);
425 
426                 priv->dev->stats.rx_packets++;
427                 priv->dev->stats.rx_bytes += pktlength;
428 
429                 entry = next_entry;
430 
431                 tse_rx_refill(priv);
432         }
433 
434         return count;
435 }
436 
437 /* Reclaim resources after transmission completes
438  */
439 static int tse_tx_complete(struct altera_tse_private *priv)
440 {
441         unsigned int txsize = priv->tx_ring_size;
442         u32 ready;
443         unsigned int entry;
444         struct tse_buffer *tx_buff;
445         int txcomplete = 0;
446 
447         spin_lock(&priv->tx_lock);
448 
449         ready = priv->dmaops->tx_completions(priv);
450 
451         /* Free sent buffers */
452         while (ready && (priv->tx_cons != priv->tx_prod)) {
453                 entry = priv->tx_cons % txsize;
454                 tx_buff = &priv->tx_ring[entry];
455 
456                 if (netif_msg_tx_done(priv))
457                         netdev_dbg(priv->dev, "%s: curr %d, dirty %d\n",
458                                    __func__, priv->tx_prod, priv->tx_cons);
459 
460                 if (likely(tx_buff->skb))
461                         priv->dev->stats.tx_packets++;
462 
463                 tse_free_tx_buffer(priv, tx_buff);
464                 priv->tx_cons++;
465 
466                 txcomplete++;
467                 ready--;
468         }
469 
470         if (unlikely(netif_queue_stopped(priv->dev) &&
471                      tse_tx_avail(priv) > TSE_TX_THRESH(priv))) {
472                 netif_tx_lock(priv->dev);
473                 if (netif_queue_stopped(priv->dev) &&
474                     tse_tx_avail(priv) > TSE_TX_THRESH(priv)) {
475                         if (netif_msg_tx_done(priv))
476                                 netdev_dbg(priv->dev, "%s: restart transmit\n",
477                                            __func__);
478                         netif_wake_queue(priv->dev);
479                 }
480                 netif_tx_unlock(priv->dev);
481         }
482 
483         spin_unlock(&priv->tx_lock);
484         return txcomplete;
485 }
486 
487 /* NAPI polling function
488  */
489 static int tse_poll(struct napi_struct *napi, int budget)
490 {
491         struct altera_tse_private *priv =
492                         container_of(napi, struct altera_tse_private, napi);
493         int rxcomplete = 0;
494         int txcomplete = 0;
495         unsigned long int flags;
496 
497         txcomplete = tse_tx_complete(priv);
498 
499         rxcomplete = tse_rx(priv, budget);
500 
501         if (rxcomplete >= budget || txcomplete > 0)
502                 return rxcomplete;
503 
504         napi_gro_flush(napi, false);
505         __napi_complete(napi);
506 
507         netdev_dbg(priv->dev,
508                    "NAPI Complete, did %d packets with budget %d\n",
509                    txcomplete+rxcomplete, budget);
510 
511         spin_lock_irqsave(&priv->rxdma_irq_lock, flags);
512         priv->dmaops->enable_rxirq(priv);
513         priv->dmaops->enable_txirq(priv);
514         spin_unlock_irqrestore(&priv->rxdma_irq_lock, flags);
515         return rxcomplete + txcomplete;
516 }
517 
518 /* DMA TX & RX FIFO interrupt routing
519  */
520 static irqreturn_t altera_isr(int irq, void *dev_id)
521 {
522         struct net_device *dev = dev_id;
523         struct altera_tse_private *priv;
524         unsigned long int flags;
525 
526         if (unlikely(!dev)) {
527                 pr_err("%s: invalid dev pointer\n", __func__);
528                 return IRQ_NONE;
529         }
530         priv = netdev_priv(dev);
531 
532         /* turn off desc irqs and enable napi rx */
533         spin_lock_irqsave(&priv->rxdma_irq_lock, flags);
534 
535         if (likely(napi_schedule_prep(&priv->napi))) {
536                 priv->dmaops->disable_rxirq(priv);
537                 priv->dmaops->disable_txirq(priv);
538                 __napi_schedule(&priv->napi);
539         }
540 
541         /* reset IRQs */
542         priv->dmaops->clear_rxirq(priv);
543         priv->dmaops->clear_txirq(priv);
544 
545         spin_unlock_irqrestore(&priv->rxdma_irq_lock, flags);
546 
547         return IRQ_HANDLED;
548 }
549 
550 /* Transmit a packet (called by the kernel). Dispatches
551  * either the SGDMA method for transmitting or the
552  * MSGDMA method, assumes no scatter/gather support,
553  * implying an assumption that there's only one
554  * physically contiguous fragment starting at
555  * skb->data, for length of skb_headlen(skb).
556  */
557 static int tse_start_xmit(struct sk_buff *skb, struct net_device *dev)
558 {
559         struct altera_tse_private *priv = netdev_priv(dev);
560         unsigned int txsize = priv->tx_ring_size;
561         unsigned int entry;
562         struct tse_buffer *buffer = NULL;
563         int nfrags = skb_shinfo(skb)->nr_frags;
564         unsigned int nopaged_len = skb_headlen(skb);
565         enum netdev_tx ret = NETDEV_TX_OK;
566         dma_addr_t dma_addr;
567 
568         spin_lock_bh(&priv->tx_lock);
569 
570         if (unlikely(tse_tx_avail(priv) < nfrags + 1)) {
571                 if (!netif_queue_stopped(dev)) {
572                         netif_stop_queue(dev);
573                         /* This is a hard error, log it. */
574                         netdev_err(priv->dev,
575                                    "%s: Tx list full when queue awake\n",
576                                    __func__);
577                 }
578                 ret = NETDEV_TX_BUSY;
579                 goto out;
580         }
581 
582         /* Map the first skb fragment */
583         entry = priv->tx_prod % txsize;
584         buffer = &priv->tx_ring[entry];
585 
586         dma_addr = dma_map_single(priv->device, skb->data, nopaged_len,
587                                   DMA_TO_DEVICE);
588         if (dma_mapping_error(priv->device, dma_addr)) {
589                 netdev_err(priv->dev, "%s: DMA mapping error\n", __func__);
590                 ret = NETDEV_TX_OK;
591                 goto out;
592         }
593 
594         buffer->skb = skb;
595         buffer->dma_addr = dma_addr;
596         buffer->len = nopaged_len;
597 
598         /* Push data out of the cache hierarchy into main memory */
599         dma_sync_single_for_device(priv->device, buffer->dma_addr,
600                                    buffer->len, DMA_TO_DEVICE);
601 
602         priv->dmaops->tx_buffer(priv, buffer);
603 
604         skb_tx_timestamp(skb);
605 
606         priv->tx_prod++;
607         dev->stats.tx_bytes += skb->len;
608 
609         if (unlikely(tse_tx_avail(priv) <= TXQUEUESTOP_THRESHHOLD)) {
610                 if (netif_msg_hw(priv))
611                         netdev_dbg(priv->dev, "%s: stop transmitted packets\n",
612                                    __func__);
613                 netif_stop_queue(dev);
614         }
615 
616 out:
617         spin_unlock_bh(&priv->tx_lock);
618 
619         return ret;
620 }
621 
622 /* Called every time the controller might need to be made
623  * aware of new link state.  The PHY code conveys this
624  * information through variables in the phydev structure, and this
625  * function converts those variables into the appropriate
626  * register values, and can bring down the device if needed.
627  */
628 static void altera_tse_adjust_link(struct net_device *dev)
629 {
630         struct altera_tse_private *priv = netdev_priv(dev);
631         struct phy_device *phydev = priv->phydev;
632         int new_state = 0;
633 
634         /* only change config if there is a link */
635         spin_lock(&priv->mac_cfg_lock);
636         if (phydev->link) {
637                 /* Read old config */
638                 u32 cfg_reg = ioread32(&priv->mac_dev->command_config);
639 
640                 /* Check duplex */
641                 if (phydev->duplex != priv->oldduplex) {
642                         new_state = 1;
643                         if (!(phydev->duplex))
644                                 cfg_reg |= MAC_CMDCFG_HD_ENA;
645                         else
646                                 cfg_reg &= ~MAC_CMDCFG_HD_ENA;
647 
648                         netdev_dbg(priv->dev, "%s: Link duplex = 0x%x\n",
649                                    dev->name, phydev->duplex);
650 
651                         priv->oldduplex = phydev->duplex;
652                 }
653 
654                 /* Check speed */
655                 if (phydev->speed != priv->oldspeed) {
656                         new_state = 1;
657                         switch (phydev->speed) {
658                         case 1000:
659                                 cfg_reg |= MAC_CMDCFG_ETH_SPEED;
660                                 cfg_reg &= ~MAC_CMDCFG_ENA_10;
661                                 break;
662                         case 100:
663                                 cfg_reg &= ~MAC_CMDCFG_ETH_SPEED;
664                                 cfg_reg &= ~MAC_CMDCFG_ENA_10;
665                                 break;
666                         case 10:
667                                 cfg_reg &= ~MAC_CMDCFG_ETH_SPEED;
668                                 cfg_reg |= MAC_CMDCFG_ENA_10;
669                                 break;
670                         default:
671                                 if (netif_msg_link(priv))
672                                         netdev_warn(dev, "Speed (%d) is not 10/100/1000!\n",
673                                                     phydev->speed);
674                                 break;
675                         }
676                         priv->oldspeed = phydev->speed;
677                 }
678                 iowrite32(cfg_reg, &priv->mac_dev->command_config);
679 
680                 if (!priv->oldlink) {
681                         new_state = 1;
682                         priv->oldlink = 1;
683                 }
684         } else if (priv->oldlink) {
685                 new_state = 1;
686                 priv->oldlink = 0;
687                 priv->oldspeed = 0;
688                 priv->oldduplex = -1;
689         }
690 
691         if (new_state && netif_msg_link(priv))
692                 phy_print_status(phydev);
693 
694         spin_unlock(&priv->mac_cfg_lock);
695 }
696 static struct phy_device *connect_local_phy(struct net_device *dev)
697 {
698         struct altera_tse_private *priv = netdev_priv(dev);
699         struct phy_device *phydev = NULL;
700         char phy_id_fmt[MII_BUS_ID_SIZE + 3];
701 
702         if (priv->phy_addr != POLL_PHY) {
703                 snprintf(phy_id_fmt, MII_BUS_ID_SIZE + 3, PHY_ID_FMT,
704                          priv->mdio->id, priv->phy_addr);
705 
706                 netdev_dbg(dev, "trying to attach to %s\n", phy_id_fmt);
707 
708                 phydev = phy_connect(dev, phy_id_fmt, &altera_tse_adjust_link,
709                                      priv->phy_iface);
710                 if (IS_ERR(phydev))
711                         netdev_err(dev, "Could not attach to PHY\n");
712 
713         } else {
714                 int ret;
715                 phydev = phy_find_first(priv->mdio);
716                 if (phydev == NULL) {
717                         netdev_err(dev, "No PHY found\n");
718                         return phydev;
719                 }
720 
721                 ret = phy_connect_direct(dev, phydev, &altera_tse_adjust_link,
722                                 priv->phy_iface);
723                 if (ret != 0) {
724                         netdev_err(dev, "Could not attach to PHY\n");
725                         phydev = NULL;
726                 }
727         }
728         return phydev;
729 }
730 
731 /* Initialize driver's PHY state, and attach to the PHY
732  */
733 static int init_phy(struct net_device *dev)
734 {
735         struct altera_tse_private *priv = netdev_priv(dev);
736         struct phy_device *phydev;
737         struct device_node *phynode;
738 
739         priv->oldlink = 0;
740         priv->oldspeed = 0;
741         priv->oldduplex = -1;
742 
743         phynode = of_parse_phandle(priv->device->of_node, "phy-handle", 0);
744 
745         if (!phynode) {
746                 netdev_dbg(dev, "no phy-handle found\n");
747                 if (!priv->mdio) {
748                         netdev_err(dev,
749                                    "No phy-handle nor local mdio specified\n");
750                         return -ENODEV;
751                 }
752                 phydev = connect_local_phy(dev);
753         } else {
754                 netdev_dbg(dev, "phy-handle found\n");
755                 phydev = of_phy_connect(dev, phynode,
756                         &altera_tse_adjust_link, 0, priv->phy_iface);
757         }
758 
759         if (!phydev) {
760                 netdev_err(dev, "Could not find the PHY\n");
761                 return -ENODEV;
762         }
763 
764         /* Stop Advertising 1000BASE Capability if interface is not GMII
765          * Note: Checkpatch throws CHECKs for the camel case defines below,
766          * it's ok to ignore.
767          */
768         if ((priv->phy_iface == PHY_INTERFACE_MODE_MII) ||
769             (priv->phy_iface == PHY_INTERFACE_MODE_RMII))
770                 phydev->advertising &= ~(SUPPORTED_1000baseT_Half |
771                                          SUPPORTED_1000baseT_Full);
772 
773         /* Broken HW is sometimes missing the pull-up resistor on the
774          * MDIO line, which results in reads to non-existent devices returning
775          * 0 rather than 0xffff. Catch this here and treat 0 as a non-existent
776          * device as well.
777          * Note: phydev->phy_id is the result of reading the UID PHY registers.
778          */
779         if (phydev->phy_id == 0) {
780                 netdev_err(dev, "Bad PHY UID 0x%08x\n", phydev->phy_id);
781                 phy_disconnect(phydev);
782                 return -ENODEV;
783         }
784 
785         netdev_dbg(dev, "attached to PHY %d UID 0x%08x Link = %d\n",
786                    phydev->addr, phydev->phy_id, phydev->link);
787 
788         priv->phydev = phydev;
789         return 0;
790 }
791 
792 static void tse_update_mac_addr(struct altera_tse_private *priv, u8 *addr)
793 {
794         u32 msb;
795         u32 lsb;
796 
797         msb = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0];
798         lsb = ((addr[5] << 8) | addr[4]) & 0xffff;
799 
800         /* Set primary MAC address */
801         csrwr32(msb, priv->mac_dev, tse_csroffs(mac_addr_0));
802         csrwr32(lsb, priv->mac_dev, tse_csroffs(mac_addr_1));
803 }
804 
805 /* MAC software reset.
806  * When reset is triggered, the MAC function completes the current
807  * transmission or reception, and subsequently disables the transmit and
808  * receive logic, flushes the receive FIFO buffer, and resets the statistics
809  * counters.
810  */
811 static int reset_mac(struct altera_tse_private *priv)
812 {
813         int counter;
814         u32 dat;
815 
816         dat = csrrd32(priv->mac_dev, tse_csroffs(command_config));
817         dat &= ~(MAC_CMDCFG_TX_ENA | MAC_CMDCFG_RX_ENA);
818         dat |= MAC_CMDCFG_SW_RESET | MAC_CMDCFG_CNT_RESET;
819         csrwr32(dat, priv->mac_dev, tse_csroffs(command_config));
820 
821         counter = 0;
822         while (counter++ < ALTERA_TSE_SW_RESET_WATCHDOG_CNTR) {
823                 if (tse_bit_is_clear(priv->mac_dev, tse_csroffs(command_config),
824                                      MAC_CMDCFG_SW_RESET))
825                         break;
826                 udelay(1);
827         }
828 
829         if (counter >= ALTERA_TSE_SW_RESET_WATCHDOG_CNTR) {
830                 dat = csrrd32(priv->mac_dev, tse_csroffs(command_config));
831                 dat &= ~MAC_CMDCFG_SW_RESET;
832                 csrwr32(dat, priv->mac_dev, tse_csroffs(command_config));
833                 return -1;
834         }
835         return 0;
836 }
837 
838 /* Initialize MAC core registers
839 */
840 static int init_mac(struct altera_tse_private *priv)
841 {
842         unsigned int cmd = 0;
843         u32 frm_length;
844 
845         /* Setup Rx FIFO */
846         csrwr32(priv->rx_fifo_depth - ALTERA_TSE_RX_SECTION_EMPTY,
847                 priv->mac_dev, tse_csroffs(rx_section_empty));
848 
849         csrwr32(ALTERA_TSE_RX_SECTION_FULL, priv->mac_dev,
850                 tse_csroffs(rx_section_full));
851 
852         csrwr32(ALTERA_TSE_RX_ALMOST_EMPTY, priv->mac_dev,
853                 tse_csroffs(rx_almost_empty));
854 
855         csrwr32(ALTERA_TSE_RX_ALMOST_FULL, priv->mac_dev,
856                 tse_csroffs(rx_almost_full));
857 
858         /* Setup Tx FIFO */
859         csrwr32(priv->tx_fifo_depth - ALTERA_TSE_TX_SECTION_EMPTY,
860                 priv->mac_dev, tse_csroffs(tx_section_empty));
861 
862         csrwr32(ALTERA_TSE_TX_SECTION_FULL, priv->mac_dev,
863                 tse_csroffs(tx_section_full));
864 
865         csrwr32(ALTERA_TSE_TX_ALMOST_EMPTY, priv->mac_dev,
866                 tse_csroffs(tx_almost_empty));
867 
868         csrwr32(ALTERA_TSE_TX_ALMOST_FULL, priv->mac_dev,
869                 tse_csroffs(tx_almost_full));
870 
871         /* MAC Address Configuration */
872         tse_update_mac_addr(priv, priv->dev->dev_addr);
873 
874         /* MAC Function Configuration */
875         frm_length = ETH_HLEN + priv->dev->mtu + ETH_FCS_LEN;
876         csrwr32(frm_length, priv->mac_dev, tse_csroffs(frm_length));
877 
878         csrwr32(ALTERA_TSE_TX_IPG_LENGTH, priv->mac_dev,
879                 tse_csroffs(tx_ipg_length));
880 
881         /* Disable RX/TX shift 16 for alignment of all received frames on 16-bit
882          * start address
883          */
884         tse_set_bit(priv->mac_dev, tse_csroffs(rx_cmd_stat),
885                     ALTERA_TSE_RX_CMD_STAT_RX_SHIFT16);
886 
887         tse_clear_bit(priv->mac_dev, tse_csroffs(tx_cmd_stat),
888                       ALTERA_TSE_TX_CMD_STAT_TX_SHIFT16 |
889                       ALTERA_TSE_TX_CMD_STAT_OMIT_CRC);
890 
891         /* Set the MAC options */
892         cmd = csrrd32(priv->mac_dev, tse_csroffs(command_config));
893         cmd &= ~MAC_CMDCFG_PAD_EN;      /* No padding Removal on Receive */
894         cmd &= ~MAC_CMDCFG_CRC_FWD;     /* CRC Removal */
895         cmd |= MAC_CMDCFG_RX_ERR_DISC;  /* Automatically discard frames
896                                          * with CRC errors
897                                          */
898         cmd |= MAC_CMDCFG_CNTL_FRM_ENA;
899         cmd &= ~MAC_CMDCFG_TX_ENA;
900         cmd &= ~MAC_CMDCFG_RX_ENA;
901 
902         /* Default speed and duplex setting, full/100 */
903         cmd &= ~MAC_CMDCFG_HD_ENA;
904         cmd &= ~MAC_CMDCFG_ETH_SPEED;
905         cmd &= ~MAC_CMDCFG_ENA_10;
906 
907         csrwr32(cmd, priv->mac_dev, tse_csroffs(command_config));
908 
909         csrwr32(ALTERA_TSE_PAUSE_QUANTA, priv->mac_dev,
910                 tse_csroffs(pause_quanta));
911 
912         if (netif_msg_hw(priv))
913                 dev_dbg(priv->device,
914                         "MAC post-initialization: CMD_CONFIG = 0x%08x\n", cmd);
915 
916         return 0;
917 }
918 
919 /* Start/stop MAC transmission logic
920  */
921 static void tse_set_mac(struct altera_tse_private *priv, bool enable)
922 {
923         u32 value = csrrd32(priv->mac_dev, tse_csroffs(command_config));
924 
925         if (enable)
926                 value |= MAC_CMDCFG_TX_ENA | MAC_CMDCFG_RX_ENA;
927         else
928                 value &= ~(MAC_CMDCFG_TX_ENA | MAC_CMDCFG_RX_ENA);
929 
930         csrwr32(value, priv->mac_dev, tse_csroffs(command_config));
931 }
932 
933 /* Change the MTU
934  */
935 static int tse_change_mtu(struct net_device *dev, int new_mtu)
936 {
937         struct altera_tse_private *priv = netdev_priv(dev);
938         unsigned int max_mtu = priv->max_mtu;
939         unsigned int min_mtu = ETH_ZLEN + ETH_FCS_LEN;
940 
941         if (netif_running(dev)) {
942                 netdev_err(dev, "must be stopped to change its MTU\n");
943                 return -EBUSY;
944         }
945 
946         if ((new_mtu < min_mtu) || (new_mtu > max_mtu)) {
947                 netdev_err(dev, "invalid MTU, max MTU is: %u\n", max_mtu);
948                 return -EINVAL;
949         }
950 
951         dev->mtu = new_mtu;
952         netdev_update_features(dev);
953 
954         return 0;
955 }
956 
957 static void altera_tse_set_mcfilter(struct net_device *dev)
958 {
959         struct altera_tse_private *priv = netdev_priv(dev);
960         int i;
961         struct netdev_hw_addr *ha;
962 
963         /* clear the hash filter */
964         for (i = 0; i < 64; i++)
965                 csrwr32(0, priv->mac_dev, tse_csroffs(hash_table) + i * 4);
966 
967         netdev_for_each_mc_addr(ha, dev) {
968                 unsigned int hash = 0;
969                 int mac_octet;
970 
971                 for (mac_octet = 5; mac_octet >= 0; mac_octet--) {
972                         unsigned char xor_bit = 0;
973                         unsigned char octet = ha->addr[mac_octet];
974                         unsigned int bitshift;
975 
976                         for (bitshift = 0; bitshift < 8; bitshift++)
977                                 xor_bit ^= ((octet >> bitshift) & 0x01);
978 
979                         hash = (hash << 1) | xor_bit;
980                 }
981                 csrwr32(1, priv->mac_dev, tse_csroffs(hash_table) + hash * 4);
982         }
983 }
984 
985 
986 static void altera_tse_set_mcfilterall(struct net_device *dev)
987 {
988         struct altera_tse_private *priv = netdev_priv(dev);
989         int i;
990 
991         /* set the hash filter */
992         for (i = 0; i < 64; i++)
993                 csrwr32(1, priv->mac_dev, tse_csroffs(hash_table) + i * 4);
994 }
995 
996 /* Set or clear the multicast filter for this adaptor
997  */
998 static void tse_set_rx_mode_hashfilter(struct net_device *dev)
999 {
1000         struct altera_tse_private *priv = netdev_priv(dev);
1001 
1002         spin_lock(&priv->mac_cfg_lock);
1003 
1004         if (dev->flags & IFF_PROMISC)
1005                 tse_set_bit(priv->mac_dev, tse_csroffs(command_config),
1006                             MAC_CMDCFG_PROMIS_EN);
1007 
1008         if (dev->flags & IFF_ALLMULTI)
1009                 altera_tse_set_mcfilterall(dev);
1010         else
1011                 altera_tse_set_mcfilter(dev);
1012 
1013         spin_unlock(&priv->mac_cfg_lock);
1014 }
1015 
1016 /* Set or clear the multicast filter for this adaptor
1017  */
1018 static void tse_set_rx_mode(struct net_device *dev)
1019 {
1020         struct altera_tse_private *priv = netdev_priv(dev);
1021 
1022         spin_lock(&priv->mac_cfg_lock);
1023 
1024         if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
1025             !netdev_mc_empty(dev) || !netdev_uc_empty(dev))
1026                 tse_set_bit(priv->mac_dev, tse_csroffs(command_config),
1027                             MAC_CMDCFG_PROMIS_EN);
1028         else
1029                 tse_clear_bit(priv->mac_dev, tse_csroffs(command_config),
1030                               MAC_CMDCFG_PROMIS_EN);
1031 
1032         spin_unlock(&priv->mac_cfg_lock);
1033 }
1034 
1035 /* Open and initialize the interface
1036  */
1037 static int tse_open(struct net_device *dev)
1038 {
1039         struct altera_tse_private *priv = netdev_priv(dev);
1040         int ret = 0;
1041         int i;
1042         unsigned long int flags;
1043 
1044         /* Reset and configure TSE MAC and probe associated PHY */
1045         ret = priv->dmaops->init_dma(priv);
1046         if (ret != 0) {
1047                 netdev_err(dev, "Cannot initialize DMA\n");
1048                 goto phy_error;
1049         }
1050 
1051         if (netif_msg_ifup(priv))
1052                 netdev_warn(dev, "device MAC address %pM\n",
1053                             dev->dev_addr);
1054 
1055         if ((priv->revision < 0xd00) || (priv->revision > 0xe00))
1056                 netdev_warn(dev, "TSE revision %x\n", priv->revision);
1057 
1058         spin_lock(&priv->mac_cfg_lock);
1059         ret = reset_mac(priv);
1060         if (ret)
1061                 netdev_err(dev, "Cannot reset MAC core (error: %d)\n", ret);
1062 
1063         ret = init_mac(priv);
1064         spin_unlock(&priv->mac_cfg_lock);
1065         if (ret) {
1066                 netdev_err(dev, "Cannot init MAC core (error: %d)\n", ret);
1067                 goto alloc_skbuf_error;
1068         }
1069 
1070         priv->dmaops->reset_dma(priv);
1071 
1072         /* Create and initialize the TX/RX descriptors chains. */
1073         priv->rx_ring_size = dma_rx_num;
1074         priv->tx_ring_size = dma_tx_num;
1075         ret = alloc_init_skbufs(priv);
1076         if (ret) {
1077                 netdev_err(dev, "DMA descriptors initialization failed\n");
1078                 goto alloc_skbuf_error;
1079         }
1080 
1081 
1082         /* Register RX interrupt */
1083         ret = request_irq(priv->rx_irq, altera_isr, IRQF_SHARED,
1084                           dev->name, dev);
1085         if (ret) {
1086                 netdev_err(dev, "Unable to register RX interrupt %d\n",
1087                            priv->rx_irq);
1088                 goto init_error;
1089         }
1090 
1091         /* Register TX interrupt */
1092         ret = request_irq(priv->tx_irq, altera_isr, IRQF_SHARED,
1093                           dev->name, dev);
1094         if (ret) {
1095                 netdev_err(dev, "Unable to register TX interrupt %d\n",
1096                            priv->tx_irq);
1097                 goto tx_request_irq_error;
1098         }
1099 
1100         /* Enable DMA interrupts */
1101         spin_lock_irqsave(&priv->rxdma_irq_lock, flags);
1102         priv->dmaops->enable_rxirq(priv);
1103         priv->dmaops->enable_txirq(priv);
1104 
1105         /* Setup RX descriptor chain */
1106         for (i = 0; i < priv->rx_ring_size; i++)
1107                 priv->dmaops->add_rx_desc(priv, &priv->rx_ring[i]);
1108 
1109         spin_unlock_irqrestore(&priv->rxdma_irq_lock, flags);
1110 
1111         if (priv->phydev)
1112                 phy_start(priv->phydev);
1113 
1114         napi_enable(&priv->napi);
1115         netif_start_queue(dev);
1116 
1117         priv->dmaops->start_rxdma(priv);
1118 
1119         /* Start MAC Rx/Tx */
1120         spin_lock(&priv->mac_cfg_lock);
1121         tse_set_mac(priv, true);
1122         spin_unlock(&priv->mac_cfg_lock);
1123 
1124         return 0;
1125 
1126 tx_request_irq_error:
1127         free_irq(priv->rx_irq, dev);
1128 init_error:
1129         free_skbufs(dev);
1130 alloc_skbuf_error:
1131         if (priv->phydev) {
1132                 phy_disconnect(priv->phydev);
1133                 priv->phydev = NULL;
1134         }
1135 phy_error:
1136         return ret;
1137 }
1138 
1139 /* Stop TSE MAC interface and put the device in an inactive state
1140  */
1141 static int tse_shutdown(struct net_device *dev)
1142 {
1143         struct altera_tse_private *priv = netdev_priv(dev);
1144         int ret;
1145         unsigned long int flags;
1146 
1147         /* Stop and disconnect the PHY */
1148         if (priv->phydev) {
1149                 phy_stop(priv->phydev);
1150                 phy_disconnect(priv->phydev);
1151                 priv->phydev = NULL;
1152         }
1153 
1154         netif_stop_queue(dev);
1155         napi_disable(&priv->napi);
1156 
1157         /* Disable DMA interrupts */
1158         spin_lock_irqsave(&priv->rxdma_irq_lock, flags);
1159         priv->dmaops->disable_rxirq(priv);
1160         priv->dmaops->disable_txirq(priv);
1161         spin_unlock_irqrestore(&priv->rxdma_irq_lock, flags);
1162 
1163         /* Free the IRQ lines */
1164         free_irq(priv->rx_irq, dev);
1165         free_irq(priv->tx_irq, dev);
1166 
1167         /* disable and reset the MAC, empties fifo */
1168         spin_lock(&priv->mac_cfg_lock);
1169         spin_lock(&priv->tx_lock);
1170 
1171         ret = reset_mac(priv);
1172         if (ret)
1173                 netdev_err(dev, "Cannot reset MAC core (error: %d)\n", ret);
1174         priv->dmaops->reset_dma(priv);
1175         free_skbufs(dev);
1176 
1177         spin_unlock(&priv->tx_lock);
1178         spin_unlock(&priv->mac_cfg_lock);
1179 
1180         priv->dmaops->uninit_dma(priv);
1181 
1182         return 0;
1183 }
1184 
1185 static struct net_device_ops altera_tse_netdev_ops = {
1186         .ndo_open               = tse_open,
1187         .ndo_stop               = tse_shutdown,
1188         .ndo_start_xmit         = tse_start_xmit,
1189         .ndo_set_mac_address    = eth_mac_addr,
1190         .ndo_set_rx_mode        = tse_set_rx_mode,
1191         .ndo_change_mtu         = tse_change_mtu,
1192         .ndo_validate_addr      = eth_validate_addr,
1193 };
1194 
1195 static int request_and_map(struct platform_device *pdev, const char *name,
1196                            struct resource **res, void __iomem **ptr)
1197 {
1198         struct resource *region;
1199         struct device *device = &pdev->dev;
1200 
1201         *res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
1202         if (*res == NULL) {
1203                 dev_err(device, "resource %s not defined\n", name);
1204                 return -ENODEV;
1205         }
1206 
1207         region = devm_request_mem_region(device, (*res)->start,
1208                                          resource_size(*res), dev_name(device));
1209         if (region == NULL) {
1210                 dev_err(device, "unable to request %s\n", name);
1211                 return -EBUSY;
1212         }
1213 
1214         *ptr = devm_ioremap_nocache(device, region->start,
1215                                     resource_size(region));
1216         if (*ptr == NULL) {
1217                 dev_err(device, "ioremap_nocache of %s failed!", name);
1218                 return -ENOMEM;
1219         }
1220 
1221         return 0;
1222 }
1223 
1224 /* Probe Altera TSE MAC device
1225  */
1226 static int altera_tse_probe(struct platform_device *pdev)
1227 {
1228         struct net_device *ndev;
1229         int ret = -ENODEV;
1230         struct resource *control_port;
1231         struct resource *dma_res;
1232         struct altera_tse_private *priv;
1233         const unsigned char *macaddr;
1234         struct device_node *np = pdev->dev.of_node;
1235         void __iomem *descmap;
1236         const struct of_device_id *of_id = NULL;
1237 
1238         ndev = alloc_etherdev(sizeof(struct altera_tse_private));
1239         if (!ndev) {
1240                 dev_err(&pdev->dev, "Could not allocate network device\n");
1241                 return -ENODEV;
1242         }
1243 
1244         SET_NETDEV_DEV(ndev, &pdev->dev);
1245 
1246         priv = netdev_priv(ndev);
1247         priv->device = &pdev->dev;
1248         priv->dev = ndev;
1249         priv->msg_enable = netif_msg_init(debug, default_msg_level);
1250 
1251         of_id = of_match_device(altera_tse_ids, &pdev->dev);
1252 
1253         if (of_id)
1254                 priv->dmaops = (struct altera_dmaops *)of_id->data;
1255 
1256 
1257         if (priv->dmaops &&
1258             priv->dmaops->altera_dtype == ALTERA_DTYPE_SGDMA) {
1259                 /* Get the mapped address to the SGDMA descriptor memory */
1260                 ret = request_and_map(pdev, "s1", &dma_res, &descmap);
1261                 if (ret)
1262                         goto err_free_netdev;
1263 
1264                 /* Start of that memory is for transmit descriptors */
1265                 priv->tx_dma_desc = descmap;
1266 
1267                 /* First half is for tx descriptors, other half for tx */
1268                 priv->txdescmem = resource_size(dma_res)/2;
1269 
1270                 priv->txdescmem_busaddr = (dma_addr_t)dma_res->start;
1271 
1272                 priv->rx_dma_desc = (void __iomem *)((uintptr_t)(descmap +
1273                                                      priv->txdescmem));
1274                 priv->rxdescmem = resource_size(dma_res)/2;
1275                 priv->rxdescmem_busaddr = dma_res->start;
1276                 priv->rxdescmem_busaddr += priv->txdescmem;
1277 
1278                 if (upper_32_bits(priv->rxdescmem_busaddr)) {
1279                         dev_dbg(priv->device,
1280                                 "SGDMA bus addresses greater than 32-bits\n");
1281                         goto err_free_netdev;
1282                 }
1283                 if (upper_32_bits(priv->txdescmem_busaddr)) {
1284                         dev_dbg(priv->device,
1285                                 "SGDMA bus addresses greater than 32-bits\n");
1286                         goto err_free_netdev;
1287                 }
1288         } else if (priv->dmaops &&
1289                    priv->dmaops->altera_dtype == ALTERA_DTYPE_MSGDMA) {
1290                 ret = request_and_map(pdev, "rx_resp", &dma_res,
1291                                       &priv->rx_dma_resp);
1292                 if (ret)
1293                         goto err_free_netdev;
1294 
1295                 ret = request_and_map(pdev, "tx_desc", &dma_res,
1296                                       &priv->tx_dma_desc);
1297                 if (ret)
1298                         goto err_free_netdev;
1299 
1300                 priv->txdescmem = resource_size(dma_res);
1301                 priv->txdescmem_busaddr = dma_res->start;
1302 
1303                 ret = request_and_map(pdev, "rx_desc", &dma_res,
1304                                       &priv->rx_dma_desc);
1305                 if (ret)
1306                         goto err_free_netdev;
1307 
1308                 priv->rxdescmem = resource_size(dma_res);
1309                 priv->rxdescmem_busaddr = dma_res->start;
1310 
1311         } else {
1312                 goto err_free_netdev;
1313         }
1314 
1315         if (!dma_set_mask(priv->device, DMA_BIT_MASK(priv->dmaops->dmamask)))
1316                 dma_set_coherent_mask(priv->device,
1317                                       DMA_BIT_MASK(priv->dmaops->dmamask));
1318         else if (!dma_set_mask(priv->device, DMA_BIT_MASK(32)))
1319                 dma_set_coherent_mask(priv->device, DMA_BIT_MASK(32));
1320         else
1321                 goto err_free_netdev;
1322 
1323         /* MAC address space */
1324         ret = request_and_map(pdev, "control_port", &control_port,
1325                               (void __iomem **)&priv->mac_dev);
1326         if (ret)
1327                 goto err_free_netdev;
1328 
1329         /* xSGDMA Rx Dispatcher address space */
1330         ret = request_and_map(pdev, "rx_csr", &dma_res,
1331                               &priv->rx_dma_csr);
1332         if (ret)
1333                 goto err_free_netdev;
1334 
1335 
1336         /* xSGDMA Tx Dispatcher address space */
1337         ret = request_and_map(pdev, "tx_csr", &dma_res,
1338                               &priv->tx_dma_csr);
1339         if (ret)
1340                 goto err_free_netdev;
1341 
1342 
1343         /* Rx IRQ */
1344         priv->rx_irq = platform_get_irq_byname(pdev, "rx_irq");
1345         if (priv->rx_irq == -ENXIO) {
1346                 dev_err(&pdev->dev, "cannot obtain Rx IRQ\n");
1347                 ret = -ENXIO;
1348                 goto err_free_netdev;
1349         }
1350 
1351         /* Tx IRQ */
1352         priv->tx_irq = platform_get_irq_byname(pdev, "tx_irq");
1353         if (priv->tx_irq == -ENXIO) {
1354                 dev_err(&pdev->dev, "cannot obtain Tx IRQ\n");
1355                 ret = -ENXIO;
1356                 goto err_free_netdev;
1357         }
1358 
1359         /* get FIFO depths from device tree */
1360         if (of_property_read_u32(pdev->dev.of_node, "rx-fifo-depth",
1361                                  &priv->rx_fifo_depth)) {
1362                 dev_err(&pdev->dev, "cannot obtain rx-fifo-depth\n");
1363                 ret = -ENXIO;
1364                 goto err_free_netdev;
1365         }
1366 
1367         if (of_property_read_u32(pdev->dev.of_node, "tx-fifo-depth",
1368                                  &priv->rx_fifo_depth)) {
1369                 dev_err(&pdev->dev, "cannot obtain tx-fifo-depth\n");
1370                 ret = -ENXIO;
1371                 goto err_free_netdev;
1372         }
1373 
1374         /* get hash filter settings for this instance */
1375         priv->hash_filter =
1376                 of_property_read_bool(pdev->dev.of_node,
1377                                       "altr,has-hash-multicast-filter");
1378 
1379         /* Set hash filter to not set for now until the
1380          * multicast filter receive issue is debugged
1381          */
1382         priv->hash_filter = 0;
1383 
1384         /* get supplemental address settings for this instance */
1385         priv->added_unicast =
1386                 of_property_read_bool(pdev->dev.of_node,
1387                                       "altr,has-supplementary-unicast");
1388 
1389         /* Max MTU is 1500, ETH_DATA_LEN */
1390         priv->max_mtu = ETH_DATA_LEN;
1391 
1392         /* Get the max mtu from the device tree. Note that the
1393          * "max-frame-size" parameter is actually max mtu. Definition
1394          * in the ePAPR v1.1 spec and usage differ, so go with usage.
1395          */
1396         of_property_read_u32(pdev->dev.of_node, "max-frame-size",
1397                              &priv->max_mtu);
1398 
1399         /* The DMA buffer size already accounts for an alignment bias
1400          * to avoid unaligned access exceptions for the NIOS processor,
1401          */
1402         priv->rx_dma_buf_sz = ALTERA_RXDMABUFFER_SIZE;
1403 
1404         /* get default MAC address from device tree */
1405         macaddr = of_get_mac_address(pdev->dev.of_node);
1406         if (macaddr)
1407                 ether_addr_copy(ndev->dev_addr, macaddr);
1408         else
1409                 eth_hw_addr_random(ndev);
1410 
1411         priv->phy_iface = of_get_phy_mode(np);
1412 
1413         /* try to get PHY address from device tree, use PHY autodetection if
1414          * no valid address is given
1415          */
1416         if (of_property_read_u32(pdev->dev.of_node, "phy-addr",
1417                                  &priv->phy_addr)) {
1418                 priv->phy_addr = POLL_PHY;
1419         }
1420 
1421         if (!((priv->phy_addr == POLL_PHY) ||
1422               ((priv->phy_addr >= 0) && (priv->phy_addr < PHY_MAX_ADDR)))) {
1423                 dev_err(&pdev->dev, "invalid phy-addr specified %d\n",
1424                         priv->phy_addr);
1425                 goto err_free_netdev;
1426         }
1427 
1428         /* Create/attach to MDIO bus */
1429         ret = altera_tse_mdio_create(ndev,
1430                                      atomic_add_return(1, &instance_count));
1431 
1432         if (ret)
1433                 goto err_free_netdev;
1434 
1435         /* initialize netdev */
1436         ether_setup(ndev);
1437         ndev->mem_start = control_port->start;
1438         ndev->mem_end = control_port->end;
1439         ndev->netdev_ops = &altera_tse_netdev_ops;
1440         altera_tse_set_ethtool_ops(ndev);
1441 
1442         altera_tse_netdev_ops.ndo_set_rx_mode = tse_set_rx_mode;
1443 
1444         if (priv->hash_filter)
1445                 altera_tse_netdev_ops.ndo_set_rx_mode =
1446                         tse_set_rx_mode_hashfilter;
1447 
1448         /* Scatter/gather IO is not supported,
1449          * so it is turned off
1450          */
1451         ndev->hw_features &= ~NETIF_F_SG;
1452         ndev->features |= ndev->hw_features | NETIF_F_HIGHDMA;
1453 
1454         /* VLAN offloading of tagging, stripping and filtering is not
1455          * supported by hardware, but driver will accommodate the
1456          * extra 4-byte VLAN tag for processing by upper layers
1457          */
1458         ndev->features |= NETIF_F_HW_VLAN_CTAG_RX;
1459 
1460         /* setup NAPI interface */
1461         netif_napi_add(ndev, &priv->napi, tse_poll, NAPI_POLL_WEIGHT);
1462 
1463         spin_lock_init(&priv->mac_cfg_lock);
1464         spin_lock_init(&priv->tx_lock);
1465         spin_lock_init(&priv->rxdma_irq_lock);
1466 
1467         ret = register_netdev(ndev);
1468         if (ret) {
1469                 dev_err(&pdev->dev, "failed to register TSE net device\n");
1470                 goto err_register_netdev;
1471         }
1472 
1473         platform_set_drvdata(pdev, ndev);
1474 
1475         priv->revision = ioread32(&priv->mac_dev->megacore_revision);
1476 
1477         if (netif_msg_probe(priv))
1478                 dev_info(&pdev->dev, "Altera TSE MAC version %d.%d at 0x%08lx irq %d/%d\n",
1479                          (priv->revision >> 8) & 0xff,
1480                          priv->revision & 0xff,
1481                          (unsigned long) control_port->start, priv->rx_irq,
1482                          priv->tx_irq);
1483 
1484         ret = init_phy(ndev);
1485         if (ret != 0) {
1486                 netdev_err(ndev, "Cannot attach to PHY (error: %d)\n", ret);
1487                 goto err_init_phy;
1488         }
1489         return 0;
1490 
1491 err_init_phy:
1492         unregister_netdev(ndev);
1493 err_register_netdev:
1494         netif_napi_del(&priv->napi);
1495         altera_tse_mdio_destroy(ndev);
1496 err_free_netdev:
1497         free_netdev(ndev);
1498         return ret;
1499 }
1500 
1501 /* Remove Altera TSE MAC device
1502  */
1503 static int altera_tse_remove(struct platform_device *pdev)
1504 {
1505         struct net_device *ndev = platform_get_drvdata(pdev);
1506 
1507         platform_set_drvdata(pdev, NULL);
1508         altera_tse_mdio_destroy(ndev);
1509         unregister_netdev(ndev);
1510         free_netdev(ndev);
1511 
1512         return 0;
1513 }
1514 
1515 static const struct altera_dmaops altera_dtype_sgdma = {
1516         .altera_dtype = ALTERA_DTYPE_SGDMA,
1517         .dmamask = 32,
1518         .reset_dma = sgdma_reset,
1519         .enable_txirq = sgdma_enable_txirq,
1520         .enable_rxirq = sgdma_enable_rxirq,
1521         .disable_txirq = sgdma_disable_txirq,
1522         .disable_rxirq = sgdma_disable_rxirq,
1523         .clear_txirq = sgdma_clear_txirq,
1524         .clear_rxirq = sgdma_clear_rxirq,
1525         .tx_buffer = sgdma_tx_buffer,
1526         .tx_completions = sgdma_tx_completions,
1527         .add_rx_desc = sgdma_add_rx_desc,
1528         .get_rx_status = sgdma_rx_status,
1529         .init_dma = sgdma_initialize,
1530         .uninit_dma = sgdma_uninitialize,
1531         .start_rxdma = sgdma_start_rxdma,
1532 };
1533 
1534 static const struct altera_dmaops altera_dtype_msgdma = {
1535         .altera_dtype = ALTERA_DTYPE_MSGDMA,
1536         .dmamask = 64,
1537         .reset_dma = msgdma_reset,
1538         .enable_txirq = msgdma_enable_txirq,
1539         .enable_rxirq = msgdma_enable_rxirq,
1540         .disable_txirq = msgdma_disable_txirq,
1541         .disable_rxirq = msgdma_disable_rxirq,
1542         .clear_txirq = msgdma_clear_txirq,
1543         .clear_rxirq = msgdma_clear_rxirq,
1544         .tx_buffer = msgdma_tx_buffer,
1545         .tx_completions = msgdma_tx_completions,
1546         .add_rx_desc = msgdma_add_rx_desc,
1547         .get_rx_status = msgdma_rx_status,
1548         .init_dma = msgdma_initialize,
1549         .uninit_dma = msgdma_uninitialize,
1550         .start_rxdma = msgdma_start_rxdma,
1551 };
1552 
1553 static struct of_device_id altera_tse_ids[] = {
1554         { .compatible = "altr,tse-msgdma-1.0", .data = &altera_dtype_msgdma, },
1555         { .compatible = "altr,tse-1.0", .data = &altera_dtype_sgdma, },
1556         { .compatible = "ALTR,tse-1.0", .data = &altera_dtype_sgdma, },
1557         {},
1558 };
1559 MODULE_DEVICE_TABLE(of, altera_tse_ids);
1560 
1561 static struct platform_driver altera_tse_driver = {
1562         .probe          = altera_tse_probe,
1563         .remove         = altera_tse_remove,
1564         .suspend        = NULL,
1565         .resume         = NULL,
1566         .driver         = {
1567                 .name   = ALTERA_TSE_RESOURCE_NAME,
1568                 .owner  = THIS_MODULE,
1569                 .of_match_table = altera_tse_ids,
1570         },
1571 };
1572 
1573 module_platform_driver(altera_tse_driver);
1574 
1575 MODULE_AUTHOR("Altera Corporation");
1576 MODULE_DESCRIPTION("Altera Triple Speed Ethernet MAC driver");
1577 MODULE_LICENSE("GPL v2");
1578 

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