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e4f2379d AB |
1 | /* |
2 | * Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com) | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Driver for the ARC EMAC 10100 (hardware revision 5) | |
9 | * | |
10 | * Contributors: | |
11 | * Amit Bhor | |
12 | * Sameer Dhavale | |
13 | * Vineet Gupta | |
14 | */ | |
15 | ||
775dd682 | 16 | #include <linux/crc32.h> |
e4f2379d AB |
17 | #include <linux/etherdevice.h> |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/io.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/of_address.h> | |
22 | #include <linux/of_irq.h> | |
23 | #include <linux/of_mdio.h> | |
24 | #include <linux/of_net.h> | |
25 | #include <linux/of_platform.h> | |
26 | ||
27 | #include "emac.h" | |
28 | ||
29 | #define DRV_NAME "arc_emac" | |
30 | #define DRV_VERSION "1.0" | |
31 | ||
32 | /** | |
33 | * arc_emac_adjust_link - Adjust the PHY link duplex. | |
34 | * @ndev: Pointer to the net_device structure. | |
35 | * | |
36 | * This function is called to change the duplex setting after auto negotiation | |
37 | * is done by the PHY. | |
38 | */ | |
39 | static void arc_emac_adjust_link(struct net_device *ndev) | |
40 | { | |
41 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
42 | struct phy_device *phy_dev = priv->phy_dev; | |
43 | unsigned int reg, state_changed = 0; | |
44 | ||
45 | if (priv->link != phy_dev->link) { | |
46 | priv->link = phy_dev->link; | |
47 | state_changed = 1; | |
48 | } | |
49 | ||
50 | if (priv->speed != phy_dev->speed) { | |
51 | priv->speed = phy_dev->speed; | |
52 | state_changed = 1; | |
53 | } | |
54 | ||
55 | if (priv->duplex != phy_dev->duplex) { | |
56 | reg = arc_reg_get(priv, R_CTRL); | |
57 | ||
58 | if (DUPLEX_FULL == phy_dev->duplex) | |
59 | reg |= ENFL_MASK; | |
60 | else | |
61 | reg &= ~ENFL_MASK; | |
62 | ||
63 | arc_reg_set(priv, R_CTRL, reg); | |
64 | priv->duplex = phy_dev->duplex; | |
65 | state_changed = 1; | |
66 | } | |
67 | ||
68 | if (state_changed) | |
69 | phy_print_status(phy_dev); | |
70 | } | |
71 | ||
72 | /** | |
73 | * arc_emac_get_settings - Get PHY settings. | |
74 | * @ndev: Pointer to net_device structure. | |
75 | * @cmd: Pointer to ethtool_cmd structure. | |
76 | * | |
77 | * This implements ethtool command for getting PHY settings. If PHY could | |
78 | * not be found, the function returns -ENODEV. This function calls the | |
79 | * relevant PHY ethtool API to get the PHY settings. | |
80 | * Issue "ethtool ethX" under linux prompt to execute this function. | |
81 | */ | |
82 | static int arc_emac_get_settings(struct net_device *ndev, | |
83 | struct ethtool_cmd *cmd) | |
84 | { | |
85 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
86 | ||
87 | return phy_ethtool_gset(priv->phy_dev, cmd); | |
88 | } | |
89 | ||
90 | /** | |
91 | * arc_emac_set_settings - Set PHY settings as passed in the argument. | |
92 | * @ndev: Pointer to net_device structure. | |
93 | * @cmd: Pointer to ethtool_cmd structure. | |
94 | * | |
95 | * This implements ethtool command for setting various PHY settings. If PHY | |
96 | * could not be found, the function returns -ENODEV. This function calls the | |
97 | * relevant PHY ethtool API to set the PHY. | |
98 | * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this | |
99 | * function. | |
100 | */ | |
101 | static int arc_emac_set_settings(struct net_device *ndev, | |
102 | struct ethtool_cmd *cmd) | |
103 | { | |
104 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
105 | ||
106 | if (!capable(CAP_NET_ADMIN)) | |
107 | return -EPERM; | |
108 | ||
109 | return phy_ethtool_sset(priv->phy_dev, cmd); | |
110 | } | |
111 | ||
112 | /** | |
113 | * arc_emac_get_drvinfo - Get EMAC driver information. | |
114 | * @ndev: Pointer to net_device structure. | |
115 | * @info: Pointer to ethtool_drvinfo structure. | |
116 | * | |
117 | * This implements ethtool command for getting the driver information. | |
118 | * Issue "ethtool -i ethX" under linux prompt to execute this function. | |
119 | */ | |
120 | static void arc_emac_get_drvinfo(struct net_device *ndev, | |
121 | struct ethtool_drvinfo *info) | |
122 | { | |
123 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
124 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
125 | } | |
126 | ||
127 | static const struct ethtool_ops arc_emac_ethtool_ops = { | |
128 | .get_settings = arc_emac_get_settings, | |
129 | .set_settings = arc_emac_set_settings, | |
130 | .get_drvinfo = arc_emac_get_drvinfo, | |
131 | .get_link = ethtool_op_get_link, | |
132 | }; | |
133 | ||
134 | #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK) | |
135 | ||
136 | /** | |
137 | * arc_emac_tx_clean - clears processed by EMAC Tx BDs. | |
138 | * @ndev: Pointer to the network device. | |
139 | */ | |
140 | static void arc_emac_tx_clean(struct net_device *ndev) | |
141 | { | |
142 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
ff458f6f | 143 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
144 | unsigned int i; |
145 | ||
146 | for (i = 0; i < TX_BD_NUM; i++) { | |
147 | unsigned int *txbd_dirty = &priv->txbd_dirty; | |
148 | struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty]; | |
149 | struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty]; | |
150 | struct sk_buff *skb = tx_buff->skb; | |
151 | unsigned int info = le32_to_cpu(txbd->info); | |
152 | ||
e4f2379d AB |
153 | if ((info & FOR_EMAC) || !txbd->data) |
154 | break; | |
155 | ||
156 | if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) { | |
157 | stats->tx_errors++; | |
158 | stats->tx_dropped++; | |
159 | ||
160 | if (info & DEFR) | |
161 | stats->tx_carrier_errors++; | |
162 | ||
163 | if (info & LTCL) | |
164 | stats->collisions++; | |
165 | ||
166 | if (info & UFLO) | |
167 | stats->tx_fifo_errors++; | |
168 | } else if (likely(info & FIRST_OR_LAST_MASK)) { | |
169 | stats->tx_packets++; | |
170 | stats->tx_bytes += skb->len; | |
171 | } | |
172 | ||
a4a1139b AB |
173 | dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr), |
174 | dma_unmap_len(tx_buff, len), DMA_TO_DEVICE); | |
e4f2379d AB |
175 | |
176 | /* return the sk_buff to system */ | |
177 | dev_kfree_skb_irq(skb); | |
178 | ||
179 | txbd->data = 0; | |
180 | txbd->info = 0; | |
181 | ||
27082ee1 VG |
182 | *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM; |
183 | ||
e4f2379d AB |
184 | if (netif_queue_stopped(ndev)) |
185 | netif_wake_queue(ndev); | |
186 | } | |
187 | } | |
188 | ||
189 | /** | |
190 | * arc_emac_rx - processing of Rx packets. | |
191 | * @ndev: Pointer to the network device. | |
192 | * @budget: How many BDs to process on 1 call. | |
193 | * | |
194 | * returns: Number of processed BDs | |
195 | * | |
196 | * Iterate through Rx BDs and deliver received packages to upper layer. | |
197 | */ | |
198 | static int arc_emac_rx(struct net_device *ndev, int budget) | |
199 | { | |
200 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
201 | unsigned int work_done; | |
202 | ||
9cff866e | 203 | for (work_done = 0; work_done < budget; work_done++) { |
e4f2379d | 204 | unsigned int *last_rx_bd = &priv->last_rx_bd; |
ff458f6f | 205 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
206 | struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; |
207 | struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; | |
e4f2379d AB |
208 | unsigned int pktlen, info = le32_to_cpu(rxbd->info); |
209 | struct sk_buff *skb; | |
210 | dma_addr_t addr; | |
211 | ||
212 | if (unlikely((info & OWN_MASK) == FOR_EMAC)) | |
213 | break; | |
214 | ||
215 | /* Make a note that we saw a packet at this BD. | |
216 | * So next time, driver starts from this + 1 | |
217 | */ | |
218 | *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; | |
219 | ||
220 | if (unlikely((info & FIRST_OR_LAST_MASK) != | |
221 | FIRST_OR_LAST_MASK)) { | |
222 | /* We pre-allocate buffers of MTU size so incoming | |
223 | * packets won't be split/chained. | |
224 | */ | |
225 | if (net_ratelimit()) | |
226 | netdev_err(ndev, "incomplete packet received\n"); | |
227 | ||
228 | /* Return ownership to EMAC */ | |
a4a1139b | 229 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); |
e4f2379d AB |
230 | stats->rx_errors++; |
231 | stats->rx_length_errors++; | |
232 | continue; | |
233 | } | |
234 | ||
235 | pktlen = info & LEN_MASK; | |
236 | stats->rx_packets++; | |
237 | stats->rx_bytes += pktlen; | |
238 | skb = rx_buff->skb; | |
239 | skb_put(skb, pktlen); | |
240 | skb->dev = ndev; | |
241 | skb->protocol = eth_type_trans(skb, ndev); | |
242 | ||
a4a1139b AB |
243 | dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), |
244 | dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); | |
e4f2379d AB |
245 | |
246 | /* Prepare the BD for next cycle */ | |
a4a1139b AB |
247 | rx_buff->skb = netdev_alloc_skb_ip_align(ndev, |
248 | EMAC_BUFFER_SIZE); | |
e4f2379d AB |
249 | if (unlikely(!rx_buff->skb)) { |
250 | stats->rx_errors++; | |
251 | /* Because receive_skb is below, increment rx_dropped */ | |
252 | stats->rx_dropped++; | |
253 | continue; | |
254 | } | |
255 | ||
256 | /* receive_skb only if new skb was allocated to avoid holes */ | |
257 | netif_receive_skb(skb); | |
258 | ||
259 | addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, | |
a4a1139b | 260 | EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); |
e4f2379d AB |
261 | if (dma_mapping_error(&ndev->dev, addr)) { |
262 | if (net_ratelimit()) | |
263 | netdev_err(ndev, "cannot dma map\n"); | |
264 | dev_kfree_skb(rx_buff->skb); | |
265 | stats->rx_errors++; | |
266 | continue; | |
267 | } | |
a4a1139b AB |
268 | dma_unmap_addr_set(rx_buff, addr, addr); |
269 | dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); | |
e4f2379d | 270 | |
a4a1139b | 271 | rxbd->data = cpu_to_le32(addr); |
e4f2379d AB |
272 | |
273 | /* Make sure pointer to data buffer is set */ | |
274 | wmb(); | |
275 | ||
276 | /* Return ownership to EMAC */ | |
a4a1139b | 277 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); |
e4f2379d AB |
278 | } |
279 | ||
280 | return work_done; | |
281 | } | |
282 | ||
283 | /** | |
284 | * arc_emac_poll - NAPI poll handler. | |
285 | * @napi: Pointer to napi_struct structure. | |
286 | * @budget: How many BDs to process on 1 call. | |
287 | * | |
288 | * returns: Number of processed BDs | |
289 | */ | |
290 | static int arc_emac_poll(struct napi_struct *napi, int budget) | |
291 | { | |
292 | struct net_device *ndev = napi->dev; | |
293 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
294 | unsigned int work_done; | |
295 | ||
296 | arc_emac_tx_clean(ndev); | |
297 | ||
298 | work_done = arc_emac_rx(ndev, budget); | |
299 | if (work_done < budget) { | |
300 | napi_complete(napi); | |
301 | arc_reg_or(priv, R_ENABLE, RXINT_MASK); | |
302 | } | |
303 | ||
304 | return work_done; | |
305 | } | |
306 | ||
307 | /** | |
308 | * arc_emac_intr - Global interrupt handler for EMAC. | |
309 | * @irq: irq number. | |
310 | * @dev_instance: device instance. | |
311 | * | |
312 | * returns: IRQ_HANDLED for all cases. | |
313 | * | |
314 | * ARC EMAC has only 1 interrupt line, and depending on bits raised in | |
315 | * STATUS register we may tell what is a reason for interrupt to fire. | |
316 | */ | |
317 | static irqreturn_t arc_emac_intr(int irq, void *dev_instance) | |
318 | { | |
319 | struct net_device *ndev = dev_instance; | |
320 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
ff458f6f | 321 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
322 | unsigned int status; |
323 | ||
324 | status = arc_reg_get(priv, R_STATUS); | |
325 | status &= ~MDIO_MASK; | |
326 | ||
327 | /* Reset all flags except "MDIO complete" */ | |
328 | arc_reg_set(priv, R_STATUS, status); | |
329 | ||
330 | if (status & RXINT_MASK) { | |
331 | if (likely(napi_schedule_prep(&priv->napi))) { | |
332 | arc_reg_clr(priv, R_ENABLE, RXINT_MASK); | |
333 | __napi_schedule(&priv->napi); | |
334 | } | |
335 | } | |
336 | ||
337 | if (status & ERR_MASK) { | |
338 | /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding | |
339 | * 8-bit error counter overrun. | |
340 | */ | |
341 | ||
342 | if (status & MSER_MASK) { | |
343 | stats->rx_missed_errors += 0x100; | |
344 | stats->rx_errors += 0x100; | |
345 | } | |
346 | ||
347 | if (status & RXCR_MASK) { | |
348 | stats->rx_crc_errors += 0x100; | |
349 | stats->rx_errors += 0x100; | |
350 | } | |
351 | ||
352 | if (status & RXFR_MASK) { | |
353 | stats->rx_frame_errors += 0x100; | |
354 | stats->rx_errors += 0x100; | |
355 | } | |
356 | ||
357 | if (status & RXFL_MASK) { | |
358 | stats->rx_over_errors += 0x100; | |
359 | stats->rx_errors += 0x100; | |
360 | } | |
361 | } | |
362 | ||
363 | return IRQ_HANDLED; | |
364 | } | |
365 | ||
5a45e57a BG |
366 | #ifdef CONFIG_NET_POLL_CONTROLLER |
367 | static void arc_emac_poll_controller(struct net_device *dev) | |
368 | { | |
369 | disable_irq(dev->irq); | |
370 | arc_emac_intr(dev->irq, dev); | |
371 | enable_irq(dev->irq); | |
372 | } | |
373 | #endif | |
374 | ||
e4f2379d AB |
375 | /** |
376 | * arc_emac_open - Open the network device. | |
377 | * @ndev: Pointer to the network device. | |
378 | * | |
379 | * returns: 0, on success or non-zero error value on failure. | |
380 | * | |
381 | * This function sets the MAC address, requests and enables an IRQ | |
382 | * for the EMAC device and starts the Tx queue. | |
383 | * It also connects to the phy device. | |
384 | */ | |
385 | static int arc_emac_open(struct net_device *ndev) | |
386 | { | |
387 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
388 | struct phy_device *phy_dev = priv->phy_dev; | |
e4f2379d AB |
389 | int i; |
390 | ||
391 | phy_dev->autoneg = AUTONEG_ENABLE; | |
392 | phy_dev->speed = 0; | |
393 | phy_dev->duplex = 0; | |
b0ac9564 | 394 | phy_dev->advertising &= phy_dev->supported; |
e4f2379d | 395 | |
a4a1139b AB |
396 | priv->last_rx_bd = 0; |
397 | ||
e4f2379d | 398 | /* Allocate and set buffers for Rx BD's */ |
e4f2379d | 399 | for (i = 0; i < RX_BD_NUM; i++) { |
a4a1139b AB |
400 | dma_addr_t addr; |
401 | unsigned int *last_rx_bd = &priv->last_rx_bd; | |
402 | struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; | |
403 | struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; | |
404 | ||
405 | rx_buff->skb = netdev_alloc_skb_ip_align(ndev, | |
406 | EMAC_BUFFER_SIZE); | |
407 | if (unlikely(!rx_buff->skb)) | |
408 | return -ENOMEM; | |
409 | ||
410 | addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, | |
411 | EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); | |
412 | if (dma_mapping_error(&ndev->dev, addr)) { | |
413 | netdev_err(ndev, "cannot dma map\n"); | |
414 | dev_kfree_skb(rx_buff->skb); | |
e4f2379d | 415 | return -ENOMEM; |
a4a1139b AB |
416 | } |
417 | dma_unmap_addr_set(rx_buff, addr, addr); | |
418 | dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); | |
e4f2379d | 419 | |
a4a1139b | 420 | rxbd->data = cpu_to_le32(addr); |
e4f2379d AB |
421 | |
422 | /* Make sure pointer to data buffer is set */ | |
423 | wmb(); | |
424 | ||
a4a1139b AB |
425 | /* Return ownership to EMAC */ |
426 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); | |
e4f2379d | 427 | |
a4a1139b AB |
428 | *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; |
429 | } | |
e4f2379d AB |
430 | |
431 | /* Clean Tx BD's */ | |
432 | memset(priv->txbd, 0, TX_RING_SZ); | |
433 | ||
434 | /* Initialize logical address filter */ | |
435 | arc_reg_set(priv, R_LAFL, 0); | |
436 | arc_reg_set(priv, R_LAFH, 0); | |
437 | ||
438 | /* Set BD ring pointers for device side */ | |
439 | arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma); | |
440 | arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma); | |
441 | ||
442 | /* Enable interrupts */ | |
443 | arc_reg_set(priv, R_ENABLE, RXINT_MASK | ERR_MASK); | |
444 | ||
445 | /* Set CONTROL */ | |
446 | arc_reg_set(priv, R_CTRL, | |
447 | (RX_BD_NUM << 24) | /* RX BD table length */ | |
448 | (TX_BD_NUM << 16) | /* TX BD table length */ | |
449 | TXRN_MASK | RXRN_MASK); | |
450 | ||
451 | napi_enable(&priv->napi); | |
452 | ||
453 | /* Enable EMAC */ | |
454 | arc_reg_or(priv, R_CTRL, EN_MASK); | |
455 | ||
456 | phy_start_aneg(priv->phy_dev); | |
457 | ||
458 | netif_start_queue(ndev); | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
775dd682 BG |
463 | /** |
464 | * arc_emac_set_rx_mode - Change the receive filtering mode. | |
465 | * @ndev: Pointer to the network device. | |
466 | * | |
467 | * This function enables/disables promiscuous or all-multicast mode | |
468 | * and updates the multicast filtering list of the network device. | |
469 | */ | |
470 | static void arc_emac_set_rx_mode(struct net_device *ndev) | |
471 | { | |
472 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
473 | ||
474 | if (ndev->flags & IFF_PROMISC) { | |
475 | arc_reg_or(priv, R_CTRL, PROM_MASK); | |
476 | } else { | |
477 | arc_reg_clr(priv, R_CTRL, PROM_MASK); | |
478 | ||
479 | if (ndev->flags & IFF_ALLMULTI) { | |
480 | arc_reg_set(priv, R_LAFL, ~0); | |
481 | arc_reg_set(priv, R_LAFH, ~0); | |
482 | } else { | |
483 | struct netdev_hw_addr *ha; | |
484 | unsigned int filter[2] = { 0, 0 }; | |
485 | int bit; | |
486 | ||
487 | netdev_for_each_mc_addr(ha, ndev) { | |
488 | bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26; | |
489 | filter[bit >> 5] |= 1 << (bit & 31); | |
490 | } | |
491 | ||
492 | arc_reg_set(priv, R_LAFL, filter[0]); | |
493 | arc_reg_set(priv, R_LAFH, filter[1]); | |
494 | } | |
495 | } | |
496 | } | |
497 | ||
e4f2379d AB |
498 | /** |
499 | * arc_emac_stop - Close the network device. | |
500 | * @ndev: Pointer to the network device. | |
501 | * | |
502 | * This function stops the Tx queue, disables interrupts and frees the IRQ for | |
503 | * the EMAC device. | |
504 | * It also disconnects the PHY device associated with the EMAC device. | |
505 | */ | |
506 | static int arc_emac_stop(struct net_device *ndev) | |
507 | { | |
508 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
509 | ||
510 | napi_disable(&priv->napi); | |
511 | netif_stop_queue(ndev); | |
512 | ||
513 | /* Disable interrupts */ | |
514 | arc_reg_clr(priv, R_ENABLE, RXINT_MASK | ERR_MASK); | |
515 | ||
516 | /* Disable EMAC */ | |
517 | arc_reg_clr(priv, R_CTRL, EN_MASK); | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
522 | /** | |
523 | * arc_emac_stats - Get system network statistics. | |
524 | * @ndev: Pointer to net_device structure. | |
525 | * | |
526 | * Returns the address of the device statistics structure. | |
527 | * Statistics are updated in interrupt handler. | |
528 | */ | |
529 | static struct net_device_stats *arc_emac_stats(struct net_device *ndev) | |
530 | { | |
531 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
ff458f6f | 532 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
533 | unsigned long miss, rxerr; |
534 | u8 rxcrc, rxfram, rxoflow; | |
535 | ||
536 | rxerr = arc_reg_get(priv, R_RXERR); | |
537 | miss = arc_reg_get(priv, R_MISS); | |
538 | ||
539 | rxcrc = rxerr; | |
540 | rxfram = rxerr >> 8; | |
541 | rxoflow = rxerr >> 16; | |
542 | ||
543 | stats->rx_errors += miss; | |
544 | stats->rx_errors += rxcrc + rxfram + rxoflow; | |
545 | ||
546 | stats->rx_over_errors += rxoflow; | |
547 | stats->rx_frame_errors += rxfram; | |
548 | stats->rx_crc_errors += rxcrc; | |
549 | stats->rx_missed_errors += miss; | |
550 | ||
551 | return stats; | |
552 | } | |
553 | ||
554 | /** | |
555 | * arc_emac_tx - Starts the data transmission. | |
556 | * @skb: sk_buff pointer that contains data to be Transmitted. | |
557 | * @ndev: Pointer to net_device structure. | |
558 | * | |
559 | * returns: NETDEV_TX_OK, on success | |
560 | * NETDEV_TX_BUSY, if any of the descriptors are not free. | |
561 | * | |
562 | * This function is invoked from upper layers to initiate transmission. | |
563 | */ | |
564 | static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev) | |
565 | { | |
566 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
567 | unsigned int len, *txbd_curr = &priv->txbd_curr; | |
ff458f6f | 568 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
569 | __le32 *info = &priv->txbd[*txbd_curr].info; |
570 | dma_addr_t addr; | |
571 | ||
572 | if (skb_padto(skb, ETH_ZLEN)) | |
573 | return NETDEV_TX_OK; | |
574 | ||
575 | len = max_t(unsigned int, ETH_ZLEN, skb->len); | |
576 | ||
577 | /* EMAC still holds this buffer in its possession. | |
578 | * CPU must not modify this buffer descriptor | |
579 | */ | |
580 | if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC)) { | |
581 | netif_stop_queue(ndev); | |
582 | return NETDEV_TX_BUSY; | |
583 | } | |
584 | ||
585 | addr = dma_map_single(&ndev->dev, (void *)skb->data, len, | |
586 | DMA_TO_DEVICE); | |
587 | ||
588 | if (unlikely(dma_mapping_error(&ndev->dev, addr))) { | |
589 | stats->tx_dropped++; | |
590 | stats->tx_errors++; | |
591 | dev_kfree_skb(skb); | |
592 | return NETDEV_TX_OK; | |
593 | } | |
a4a1139b | 594 | dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr); |
e4f2379d AB |
595 | dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len); |
596 | ||
597 | priv->tx_buff[*txbd_curr].skb = skb; | |
a4a1139b | 598 | priv->txbd[*txbd_curr].data = cpu_to_le32(addr); |
e4f2379d AB |
599 | |
600 | /* Make sure pointer to data buffer is set */ | |
601 | wmb(); | |
602 | ||
37ec274e ED |
603 | skb_tx_timestamp(skb); |
604 | ||
e4f2379d AB |
605 | *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len); |
606 | ||
607 | /* Increment index to point to the next BD */ | |
608 | *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM; | |
609 | ||
610 | /* Get "info" of the next BD */ | |
611 | info = &priv->txbd[*txbd_curr].info; | |
612 | ||
613 | /* Check if if Tx BD ring is full - next BD is still owned by EMAC */ | |
614 | if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC)) | |
615 | netif_stop_queue(ndev); | |
616 | ||
617 | arc_reg_set(priv, R_STATUS, TXPL_MASK); | |
618 | ||
e4f2379d AB |
619 | return NETDEV_TX_OK; |
620 | } | |
621 | ||
235a251a MS |
622 | static void arc_emac_set_address_internal(struct net_device *ndev) |
623 | { | |
624 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
625 | unsigned int addr_low, addr_hi; | |
626 | ||
627 | addr_low = le32_to_cpu(*(__le32 *) &ndev->dev_addr[0]); | |
628 | addr_hi = le16_to_cpu(*(__le16 *) &ndev->dev_addr[4]); | |
629 | ||
630 | arc_reg_set(priv, R_ADDRL, addr_low); | |
631 | arc_reg_set(priv, R_ADDRH, addr_hi); | |
632 | } | |
633 | ||
e4f2379d AB |
634 | /** |
635 | * arc_emac_set_address - Set the MAC address for this device. | |
636 | * @ndev: Pointer to net_device structure. | |
637 | * @p: 6 byte Address to be written as MAC address. | |
638 | * | |
639 | * This function copies the HW address from the sockaddr structure to the | |
640 | * net_device structure and updates the address in HW. | |
641 | * | |
642 | * returns: -EBUSY if the net device is busy or 0 if the address is set | |
643 | * successfully. | |
644 | */ | |
645 | static int arc_emac_set_address(struct net_device *ndev, void *p) | |
646 | { | |
e4f2379d | 647 | struct sockaddr *addr = p; |
e4f2379d AB |
648 | |
649 | if (netif_running(ndev)) | |
650 | return -EBUSY; | |
651 | ||
652 | if (!is_valid_ether_addr(addr->sa_data)) | |
653 | return -EADDRNOTAVAIL; | |
654 | ||
655 | memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len); | |
656 | ||
235a251a | 657 | arc_emac_set_address_internal(ndev); |
e4f2379d AB |
658 | |
659 | return 0; | |
660 | } | |
661 | ||
662 | static const struct net_device_ops arc_emac_netdev_ops = { | |
663 | .ndo_open = arc_emac_open, | |
664 | .ndo_stop = arc_emac_stop, | |
665 | .ndo_start_xmit = arc_emac_tx, | |
666 | .ndo_set_mac_address = arc_emac_set_address, | |
667 | .ndo_get_stats = arc_emac_stats, | |
775dd682 | 668 | .ndo_set_rx_mode = arc_emac_set_rx_mode, |
5a45e57a BG |
669 | #ifdef CONFIG_NET_POLL_CONTROLLER |
670 | .ndo_poll_controller = arc_emac_poll_controller, | |
671 | #endif | |
e4f2379d AB |
672 | }; |
673 | ||
674 | static int arc_emac_probe(struct platform_device *pdev) | |
675 | { | |
f7578496 | 676 | struct resource res_regs; |
e4f2379d AB |
677 | struct device_node *phy_node; |
678 | struct arc_emac_priv *priv; | |
679 | struct net_device *ndev; | |
680 | const char *mac_addr; | |
f7578496 | 681 | unsigned int id, clock_frequency, irq; |
e4f2379d AB |
682 | int err; |
683 | ||
684 | if (!pdev->dev.of_node) | |
685 | return -ENODEV; | |
686 | ||
687 | /* Get PHY from device tree */ | |
688 | phy_node = of_parse_phandle(pdev->dev.of_node, "phy", 0); | |
689 | if (!phy_node) { | |
690 | dev_err(&pdev->dev, "failed to retrieve phy description from device tree\n"); | |
691 | return -ENODEV; | |
692 | } | |
693 | ||
694 | /* Get EMAC registers base address from device tree */ | |
695 | err = of_address_to_resource(pdev->dev.of_node, 0, &res_regs); | |
696 | if (err) { | |
697 | dev_err(&pdev->dev, "failed to retrieve registers base from device tree\n"); | |
698 | return -ENODEV; | |
699 | } | |
700 | ||
e4f2379d | 701 | /* Get IRQ from device tree */ |
f7578496 TR |
702 | irq = irq_of_parse_and_map(pdev->dev.of_node, 0); |
703 | if (!irq) { | |
e4f2379d AB |
704 | dev_err(&pdev->dev, "failed to retrieve <irq> value from device tree\n"); |
705 | return -ENODEV; | |
706 | } | |
707 | ||
708 | ndev = alloc_etherdev(sizeof(struct arc_emac_priv)); | |
709 | if (!ndev) | |
710 | return -ENOMEM; | |
711 | ||
45f1b027 | 712 | platform_set_drvdata(pdev, ndev); |
e4f2379d AB |
713 | SET_NETDEV_DEV(ndev, &pdev->dev); |
714 | ||
715 | ndev->netdev_ops = &arc_emac_netdev_ops; | |
716 | ndev->ethtool_ops = &arc_emac_ethtool_ops; | |
717 | ndev->watchdog_timeo = TX_TIMEOUT; | |
718 | /* FIXME :: no multicast support yet */ | |
719 | ndev->flags &= ~IFF_MULTICAST; | |
720 | ||
721 | priv = netdev_priv(ndev); | |
722 | priv->dev = &pdev->dev; | |
e4f2379d AB |
723 | |
724 | priv->regs = devm_ioremap_resource(&pdev->dev, &res_regs); | |
725 | if (IS_ERR(priv->regs)) { | |
726 | err = PTR_ERR(priv->regs); | |
796bec1e | 727 | goto out_netdev; |
e4f2379d AB |
728 | } |
729 | dev_dbg(&pdev->dev, "Registers base address is 0x%p\n", priv->regs); | |
730 | ||
88154c96 HS |
731 | priv->clk = of_clk_get(pdev->dev.of_node, 0); |
732 | if (IS_ERR(priv->clk)) { | |
733 | /* Get CPU clock frequency from device tree */ | |
734 | if (of_property_read_u32(pdev->dev.of_node, "clock-frequency", | |
735 | &clock_frequency)) { | |
736 | dev_err(&pdev->dev, "failed to retrieve <clock-frequency> from device tree\n"); | |
737 | err = -EINVAL; | |
738 | goto out_netdev; | |
739 | } | |
740 | } else { | |
741 | err = clk_prepare_enable(priv->clk); | |
742 | if (err) { | |
743 | dev_err(&pdev->dev, "failed to enable clock\n"); | |
744 | goto out_clkget; | |
745 | } | |
746 | ||
747 | clock_frequency = clk_get_rate(priv->clk); | |
748 | } | |
749 | ||
e4f2379d AB |
750 | id = arc_reg_get(priv, R_ID); |
751 | ||
752 | /* Check for EMAC revision 5 or 7, magic number */ | |
753 | if (!(id == 0x0005fd02 || id == 0x0007fd02)) { | |
754 | dev_err(&pdev->dev, "ARC EMAC not detected, id=0x%x\n", id); | |
755 | err = -ENODEV; | |
88154c96 | 756 | goto out_clken; |
e4f2379d AB |
757 | } |
758 | dev_info(&pdev->dev, "ARC EMAC detected with id: 0x%x\n", id); | |
759 | ||
760 | /* Set poll rate so that it polls every 1 ms */ | |
761 | arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000); | |
762 | ||
f7578496 | 763 | ndev->irq = irq; |
e4f2379d AB |
764 | dev_info(&pdev->dev, "IRQ is %d\n", ndev->irq); |
765 | ||
766 | /* Register interrupt handler for device */ | |
767 | err = devm_request_irq(&pdev->dev, ndev->irq, arc_emac_intr, 0, | |
768 | ndev->name, ndev); | |
769 | if (err) { | |
770 | dev_err(&pdev->dev, "could not allocate IRQ\n"); | |
88154c96 | 771 | goto out_clken; |
e4f2379d AB |
772 | } |
773 | ||
774 | /* Get MAC address from device tree */ | |
775 | mac_addr = of_get_mac_address(pdev->dev.of_node); | |
776 | ||
99470819 | 777 | if (mac_addr) |
e4f2379d | 778 | memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); |
99470819 LP |
779 | else |
780 | eth_hw_addr_random(ndev); | |
e4f2379d | 781 | |
235a251a | 782 | arc_emac_set_address_internal(ndev); |
e4f2379d AB |
783 | dev_info(&pdev->dev, "MAC address is now %pM\n", ndev->dev_addr); |
784 | ||
785 | /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */ | |
786 | priv->rxbd = dmam_alloc_coherent(&pdev->dev, RX_RING_SZ + TX_RING_SZ, | |
787 | &priv->rxbd_dma, GFP_KERNEL); | |
788 | ||
789 | if (!priv->rxbd) { | |
790 | dev_err(&pdev->dev, "failed to allocate data buffers\n"); | |
791 | err = -ENOMEM; | |
88154c96 | 792 | goto out_clken; |
e4f2379d AB |
793 | } |
794 | ||
795 | priv->txbd = priv->rxbd + RX_BD_NUM; | |
796 | ||
797 | priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ; | |
798 | dev_dbg(&pdev->dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n", | |
799 | (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma); | |
800 | ||
801 | err = arc_mdio_probe(pdev, priv); | |
802 | if (err) { | |
803 | dev_err(&pdev->dev, "failed to probe MII bus\n"); | |
88154c96 | 804 | goto out_clken; |
e4f2379d AB |
805 | } |
806 | ||
807 | priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0, | |
808 | PHY_INTERFACE_MODE_MII); | |
809 | if (!priv->phy_dev) { | |
810 | dev_err(&pdev->dev, "of_phy_connect() failed\n"); | |
811 | err = -ENODEV; | |
796bec1e | 812 | goto out_mdio; |
e4f2379d AB |
813 | } |
814 | ||
815 | dev_info(&pdev->dev, "connected to %s phy with id 0x%x\n", | |
816 | priv->phy_dev->drv->name, priv->phy_dev->phy_id); | |
817 | ||
818 | netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT); | |
819 | ||
820 | err = register_netdev(ndev); | |
821 | if (err) { | |
e4f2379d | 822 | dev_err(&pdev->dev, "failed to register network device\n"); |
796bec1e | 823 | goto out_netif_api; |
e4f2379d AB |
824 | } |
825 | ||
826 | return 0; | |
827 | ||
796bec1e HS |
828 | out_netif_api: |
829 | netif_napi_del(&priv->napi); | |
830 | phy_disconnect(priv->phy_dev); | |
831 | priv->phy_dev = NULL; | |
832 | out_mdio: | |
833 | arc_mdio_remove(priv); | |
88154c96 HS |
834 | out_clken: |
835 | if (!IS_ERR(priv->clk)) | |
836 | clk_disable_unprepare(priv->clk); | |
837 | out_clkget: | |
838 | if (!IS_ERR(priv->clk)) | |
839 | clk_put(priv->clk); | |
796bec1e | 840 | out_netdev: |
e4f2379d AB |
841 | free_netdev(ndev); |
842 | return err; | |
843 | } | |
844 | ||
845 | static int arc_emac_remove(struct platform_device *pdev) | |
846 | { | |
847 | struct net_device *ndev = platform_get_drvdata(pdev); | |
848 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
849 | ||
850 | phy_disconnect(priv->phy_dev); | |
851 | priv->phy_dev = NULL; | |
852 | arc_mdio_remove(priv); | |
853 | unregister_netdev(ndev); | |
854 | netif_napi_del(&priv->napi); | |
88154c96 HS |
855 | |
856 | if (!IS_ERR(priv->clk)) { | |
857 | clk_disable_unprepare(priv->clk); | |
858 | clk_put(priv->clk); | |
859 | } | |
860 | ||
e4f2379d AB |
861 | free_netdev(ndev); |
862 | ||
863 | return 0; | |
864 | } | |
865 | ||
866 | static const struct of_device_id arc_emac_dt_ids[] = { | |
867 | { .compatible = "snps,arc-emac" }, | |
868 | { /* Sentinel */ } | |
869 | }; | |
870 | MODULE_DEVICE_TABLE(of, arc_emac_dt_ids); | |
871 | ||
872 | static struct platform_driver arc_emac_driver = { | |
873 | .probe = arc_emac_probe, | |
874 | .remove = arc_emac_remove, | |
875 | .driver = { | |
876 | .name = DRV_NAME, | |
877 | .owner = THIS_MODULE, | |
878 | .of_match_table = arc_emac_dt_ids, | |
879 | }, | |
880 | }; | |
881 | ||
882 | module_platform_driver(arc_emac_driver); | |
883 | ||
884 | MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>"); | |
885 | MODULE_DESCRIPTION("ARC EMAC driver"); | |
886 | MODULE_LICENSE("GPL"); |