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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 | ||
16 | #include <linux/etherdevice.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/io.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/of_address.h> | |
21 | #include <linux/of_irq.h> | |
22 | #include <linux/of_mdio.h> | |
23 | #include <linux/of_net.h> | |
24 | #include <linux/of_platform.h> | |
25 | ||
26 | #include "emac.h" | |
27 | ||
28 | #define DRV_NAME "arc_emac" | |
29 | #define DRV_VERSION "1.0" | |
30 | ||
31 | /** | |
32 | * arc_emac_adjust_link - Adjust the PHY link duplex. | |
33 | * @ndev: Pointer to the net_device structure. | |
34 | * | |
35 | * This function is called to change the duplex setting after auto negotiation | |
36 | * is done by the PHY. | |
37 | */ | |
38 | static void arc_emac_adjust_link(struct net_device *ndev) | |
39 | { | |
40 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
41 | struct phy_device *phy_dev = priv->phy_dev; | |
42 | unsigned int reg, state_changed = 0; | |
43 | ||
44 | if (priv->link != phy_dev->link) { | |
45 | priv->link = phy_dev->link; | |
46 | state_changed = 1; | |
47 | } | |
48 | ||
49 | if (priv->speed != phy_dev->speed) { | |
50 | priv->speed = phy_dev->speed; | |
51 | state_changed = 1; | |
52 | } | |
53 | ||
54 | if (priv->duplex != phy_dev->duplex) { | |
55 | reg = arc_reg_get(priv, R_CTRL); | |
56 | ||
57 | if (DUPLEX_FULL == phy_dev->duplex) | |
58 | reg |= ENFL_MASK; | |
59 | else | |
60 | reg &= ~ENFL_MASK; | |
61 | ||
62 | arc_reg_set(priv, R_CTRL, reg); | |
63 | priv->duplex = phy_dev->duplex; | |
64 | state_changed = 1; | |
65 | } | |
66 | ||
67 | if (state_changed) | |
68 | phy_print_status(phy_dev); | |
69 | } | |
70 | ||
71 | /** | |
72 | * arc_emac_get_settings - Get PHY settings. | |
73 | * @ndev: Pointer to net_device structure. | |
74 | * @cmd: Pointer to ethtool_cmd structure. | |
75 | * | |
76 | * This implements ethtool command for getting PHY settings. If PHY could | |
77 | * not be found, the function returns -ENODEV. This function calls the | |
78 | * relevant PHY ethtool API to get the PHY settings. | |
79 | * Issue "ethtool ethX" under linux prompt to execute this function. | |
80 | */ | |
81 | static int arc_emac_get_settings(struct net_device *ndev, | |
82 | struct ethtool_cmd *cmd) | |
83 | { | |
84 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
85 | ||
86 | return phy_ethtool_gset(priv->phy_dev, cmd); | |
87 | } | |
88 | ||
89 | /** | |
90 | * arc_emac_set_settings - Set PHY settings as passed in the argument. | |
91 | * @ndev: Pointer to net_device structure. | |
92 | * @cmd: Pointer to ethtool_cmd structure. | |
93 | * | |
94 | * This implements ethtool command for setting various PHY settings. If PHY | |
95 | * could not be found, the function returns -ENODEV. This function calls the | |
96 | * relevant PHY ethtool API to set the PHY. | |
97 | * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this | |
98 | * function. | |
99 | */ | |
100 | static int arc_emac_set_settings(struct net_device *ndev, | |
101 | struct ethtool_cmd *cmd) | |
102 | { | |
103 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
104 | ||
105 | if (!capable(CAP_NET_ADMIN)) | |
106 | return -EPERM; | |
107 | ||
108 | return phy_ethtool_sset(priv->phy_dev, cmd); | |
109 | } | |
110 | ||
111 | /** | |
112 | * arc_emac_get_drvinfo - Get EMAC driver information. | |
113 | * @ndev: Pointer to net_device structure. | |
114 | * @info: Pointer to ethtool_drvinfo structure. | |
115 | * | |
116 | * This implements ethtool command for getting the driver information. | |
117 | * Issue "ethtool -i ethX" under linux prompt to execute this function. | |
118 | */ | |
119 | static void arc_emac_get_drvinfo(struct net_device *ndev, | |
120 | struct ethtool_drvinfo *info) | |
121 | { | |
122 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); | |
123 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
124 | } | |
125 | ||
126 | static const struct ethtool_ops arc_emac_ethtool_ops = { | |
127 | .get_settings = arc_emac_get_settings, | |
128 | .set_settings = arc_emac_set_settings, | |
129 | .get_drvinfo = arc_emac_get_drvinfo, | |
130 | .get_link = ethtool_op_get_link, | |
131 | }; | |
132 | ||
133 | #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK) | |
134 | ||
135 | /** | |
136 | * arc_emac_tx_clean - clears processed by EMAC Tx BDs. | |
137 | * @ndev: Pointer to the network device. | |
138 | */ | |
139 | static void arc_emac_tx_clean(struct net_device *ndev) | |
140 | { | |
141 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
142 | struct net_device_stats *stats = &priv->stats; | |
143 | unsigned int i; | |
144 | ||
145 | for (i = 0; i < TX_BD_NUM; i++) { | |
146 | unsigned int *txbd_dirty = &priv->txbd_dirty; | |
147 | struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty]; | |
148 | struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty]; | |
149 | struct sk_buff *skb = tx_buff->skb; | |
150 | unsigned int info = le32_to_cpu(txbd->info); | |
151 | ||
152 | *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM; | |
153 | ||
154 | if ((info & FOR_EMAC) || !txbd->data) | |
155 | break; | |
156 | ||
157 | if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) { | |
158 | stats->tx_errors++; | |
159 | stats->tx_dropped++; | |
160 | ||
161 | if (info & DEFR) | |
162 | stats->tx_carrier_errors++; | |
163 | ||
164 | if (info & LTCL) | |
165 | stats->collisions++; | |
166 | ||
167 | if (info & UFLO) | |
168 | stats->tx_fifo_errors++; | |
169 | } else if (likely(info & FIRST_OR_LAST_MASK)) { | |
170 | stats->tx_packets++; | |
171 | stats->tx_bytes += skb->len; | |
172 | } | |
173 | ||
a4a1139b AB |
174 | dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr), |
175 | dma_unmap_len(tx_buff, len), DMA_TO_DEVICE); | |
e4f2379d AB |
176 | |
177 | /* return the sk_buff to system */ | |
178 | dev_kfree_skb_irq(skb); | |
179 | ||
180 | txbd->data = 0; | |
181 | txbd->info = 0; | |
182 | ||
183 | if (netif_queue_stopped(ndev)) | |
184 | netif_wake_queue(ndev); | |
185 | } | |
186 | } | |
187 | ||
188 | /** | |
189 | * arc_emac_rx - processing of Rx packets. | |
190 | * @ndev: Pointer to the network device. | |
191 | * @budget: How many BDs to process on 1 call. | |
192 | * | |
193 | * returns: Number of processed BDs | |
194 | * | |
195 | * Iterate through Rx BDs and deliver received packages to upper layer. | |
196 | */ | |
197 | static int arc_emac_rx(struct net_device *ndev, int budget) | |
198 | { | |
199 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
200 | unsigned int work_done; | |
201 | ||
202 | for (work_done = 0; work_done <= budget; work_done++) { | |
203 | unsigned int *last_rx_bd = &priv->last_rx_bd; | |
204 | struct net_device_stats *stats = &priv->stats; | |
205 | struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; | |
206 | struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; | |
e4f2379d AB |
207 | unsigned int pktlen, info = le32_to_cpu(rxbd->info); |
208 | struct sk_buff *skb; | |
209 | dma_addr_t addr; | |
210 | ||
211 | if (unlikely((info & OWN_MASK) == FOR_EMAC)) | |
212 | break; | |
213 | ||
214 | /* Make a note that we saw a packet at this BD. | |
215 | * So next time, driver starts from this + 1 | |
216 | */ | |
217 | *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; | |
218 | ||
219 | if (unlikely((info & FIRST_OR_LAST_MASK) != | |
220 | FIRST_OR_LAST_MASK)) { | |
221 | /* We pre-allocate buffers of MTU size so incoming | |
222 | * packets won't be split/chained. | |
223 | */ | |
224 | if (net_ratelimit()) | |
225 | netdev_err(ndev, "incomplete packet received\n"); | |
226 | ||
227 | /* Return ownership to EMAC */ | |
a4a1139b | 228 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); |
e4f2379d AB |
229 | stats->rx_errors++; |
230 | stats->rx_length_errors++; | |
231 | continue; | |
232 | } | |
233 | ||
234 | pktlen = info & LEN_MASK; | |
235 | stats->rx_packets++; | |
236 | stats->rx_bytes += pktlen; | |
237 | skb = rx_buff->skb; | |
238 | skb_put(skb, pktlen); | |
239 | skb->dev = ndev; | |
240 | skb->protocol = eth_type_trans(skb, ndev); | |
241 | ||
a4a1139b AB |
242 | dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), |
243 | dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); | |
e4f2379d AB |
244 | |
245 | /* Prepare the BD for next cycle */ | |
a4a1139b AB |
246 | rx_buff->skb = netdev_alloc_skb_ip_align(ndev, |
247 | EMAC_BUFFER_SIZE); | |
e4f2379d AB |
248 | if (unlikely(!rx_buff->skb)) { |
249 | stats->rx_errors++; | |
250 | /* Because receive_skb is below, increment rx_dropped */ | |
251 | stats->rx_dropped++; | |
252 | continue; | |
253 | } | |
254 | ||
255 | /* receive_skb only if new skb was allocated to avoid holes */ | |
256 | netif_receive_skb(skb); | |
257 | ||
258 | addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, | |
a4a1139b | 259 | EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); |
e4f2379d AB |
260 | if (dma_mapping_error(&ndev->dev, addr)) { |
261 | if (net_ratelimit()) | |
262 | netdev_err(ndev, "cannot dma map\n"); | |
263 | dev_kfree_skb(rx_buff->skb); | |
264 | stats->rx_errors++; | |
265 | continue; | |
266 | } | |
a4a1139b AB |
267 | dma_unmap_addr_set(rx_buff, addr, addr); |
268 | dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); | |
e4f2379d | 269 | |
a4a1139b | 270 | rxbd->data = cpu_to_le32(addr); |
e4f2379d AB |
271 | |
272 | /* Make sure pointer to data buffer is set */ | |
273 | wmb(); | |
274 | ||
275 | /* Return ownership to EMAC */ | |
a4a1139b | 276 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); |
e4f2379d AB |
277 | } |
278 | ||
279 | return work_done; | |
280 | } | |
281 | ||
282 | /** | |
283 | * arc_emac_poll - NAPI poll handler. | |
284 | * @napi: Pointer to napi_struct structure. | |
285 | * @budget: How many BDs to process on 1 call. | |
286 | * | |
287 | * returns: Number of processed BDs | |
288 | */ | |
289 | static int arc_emac_poll(struct napi_struct *napi, int budget) | |
290 | { | |
291 | struct net_device *ndev = napi->dev; | |
292 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
293 | unsigned int work_done; | |
294 | ||
295 | arc_emac_tx_clean(ndev); | |
296 | ||
297 | work_done = arc_emac_rx(ndev, budget); | |
298 | if (work_done < budget) { | |
299 | napi_complete(napi); | |
300 | arc_reg_or(priv, R_ENABLE, RXINT_MASK); | |
301 | } | |
302 | ||
303 | return work_done; | |
304 | } | |
305 | ||
306 | /** | |
307 | * arc_emac_intr - Global interrupt handler for EMAC. | |
308 | * @irq: irq number. | |
309 | * @dev_instance: device instance. | |
310 | * | |
311 | * returns: IRQ_HANDLED for all cases. | |
312 | * | |
313 | * ARC EMAC has only 1 interrupt line, and depending on bits raised in | |
314 | * STATUS register we may tell what is a reason for interrupt to fire. | |
315 | */ | |
316 | static irqreturn_t arc_emac_intr(int irq, void *dev_instance) | |
317 | { | |
318 | struct net_device *ndev = dev_instance; | |
319 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
320 | struct net_device_stats *stats = &priv->stats; | |
321 | unsigned int status; | |
322 | ||
323 | status = arc_reg_get(priv, R_STATUS); | |
324 | status &= ~MDIO_MASK; | |
325 | ||
326 | /* Reset all flags except "MDIO complete" */ | |
327 | arc_reg_set(priv, R_STATUS, status); | |
328 | ||
329 | if (status & RXINT_MASK) { | |
330 | if (likely(napi_schedule_prep(&priv->napi))) { | |
331 | arc_reg_clr(priv, R_ENABLE, RXINT_MASK); | |
332 | __napi_schedule(&priv->napi); | |
333 | } | |
334 | } | |
335 | ||
336 | if (status & ERR_MASK) { | |
337 | /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding | |
338 | * 8-bit error counter overrun. | |
339 | */ | |
340 | ||
341 | if (status & MSER_MASK) { | |
342 | stats->rx_missed_errors += 0x100; | |
343 | stats->rx_errors += 0x100; | |
344 | } | |
345 | ||
346 | if (status & RXCR_MASK) { | |
347 | stats->rx_crc_errors += 0x100; | |
348 | stats->rx_errors += 0x100; | |
349 | } | |
350 | ||
351 | if (status & RXFR_MASK) { | |
352 | stats->rx_frame_errors += 0x100; | |
353 | stats->rx_errors += 0x100; | |
354 | } | |
355 | ||
356 | if (status & RXFL_MASK) { | |
357 | stats->rx_over_errors += 0x100; | |
358 | stats->rx_errors += 0x100; | |
359 | } | |
360 | } | |
361 | ||
362 | return IRQ_HANDLED; | |
363 | } | |
364 | ||
365 | /** | |
366 | * arc_emac_open - Open the network device. | |
367 | * @ndev: Pointer to the network device. | |
368 | * | |
369 | * returns: 0, on success or non-zero error value on failure. | |
370 | * | |
371 | * This function sets the MAC address, requests and enables an IRQ | |
372 | * for the EMAC device and starts the Tx queue. | |
373 | * It also connects to the phy device. | |
374 | */ | |
375 | static int arc_emac_open(struct net_device *ndev) | |
376 | { | |
377 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
378 | struct phy_device *phy_dev = priv->phy_dev; | |
e4f2379d AB |
379 | int i; |
380 | ||
381 | phy_dev->autoneg = AUTONEG_ENABLE; | |
382 | phy_dev->speed = 0; | |
383 | phy_dev->duplex = 0; | |
384 | phy_dev->advertising = phy_dev->supported; | |
385 | ||
386 | if (priv->max_speed > 100) { | |
387 | phy_dev->advertising &= PHY_GBIT_FEATURES; | |
388 | } else if (priv->max_speed <= 100) { | |
389 | phy_dev->advertising &= PHY_BASIC_FEATURES; | |
390 | if (priv->max_speed <= 10) { | |
391 | phy_dev->advertising &= ~SUPPORTED_100baseT_Half; | |
392 | phy_dev->advertising &= ~SUPPORTED_100baseT_Full; | |
393 | } | |
394 | } | |
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 | ||
463 | /** | |
464 | * arc_emac_stop - Close the network device. | |
465 | * @ndev: Pointer to the network device. | |
466 | * | |
467 | * This function stops the Tx queue, disables interrupts and frees the IRQ for | |
468 | * the EMAC device. | |
469 | * It also disconnects the PHY device associated with the EMAC device. | |
470 | */ | |
471 | static int arc_emac_stop(struct net_device *ndev) | |
472 | { | |
473 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
474 | ||
475 | napi_disable(&priv->napi); | |
476 | netif_stop_queue(ndev); | |
477 | ||
478 | /* Disable interrupts */ | |
479 | arc_reg_clr(priv, R_ENABLE, RXINT_MASK | ERR_MASK); | |
480 | ||
481 | /* Disable EMAC */ | |
482 | arc_reg_clr(priv, R_CTRL, EN_MASK); | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
487 | /** | |
488 | * arc_emac_stats - Get system network statistics. | |
489 | * @ndev: Pointer to net_device structure. | |
490 | * | |
491 | * Returns the address of the device statistics structure. | |
492 | * Statistics are updated in interrupt handler. | |
493 | */ | |
494 | static struct net_device_stats *arc_emac_stats(struct net_device *ndev) | |
495 | { | |
496 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
497 | struct net_device_stats *stats = &priv->stats; | |
498 | unsigned long miss, rxerr; | |
499 | u8 rxcrc, rxfram, rxoflow; | |
500 | ||
501 | rxerr = arc_reg_get(priv, R_RXERR); | |
502 | miss = arc_reg_get(priv, R_MISS); | |
503 | ||
504 | rxcrc = rxerr; | |
505 | rxfram = rxerr >> 8; | |
506 | rxoflow = rxerr >> 16; | |
507 | ||
508 | stats->rx_errors += miss; | |
509 | stats->rx_errors += rxcrc + rxfram + rxoflow; | |
510 | ||
511 | stats->rx_over_errors += rxoflow; | |
512 | stats->rx_frame_errors += rxfram; | |
513 | stats->rx_crc_errors += rxcrc; | |
514 | stats->rx_missed_errors += miss; | |
515 | ||
516 | return stats; | |
517 | } | |
518 | ||
519 | /** | |
520 | * arc_emac_tx - Starts the data transmission. | |
521 | * @skb: sk_buff pointer that contains data to be Transmitted. | |
522 | * @ndev: Pointer to net_device structure. | |
523 | * | |
524 | * returns: NETDEV_TX_OK, on success | |
525 | * NETDEV_TX_BUSY, if any of the descriptors are not free. | |
526 | * | |
527 | * This function is invoked from upper layers to initiate transmission. | |
528 | */ | |
529 | static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev) | |
530 | { | |
531 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
532 | unsigned int len, *txbd_curr = &priv->txbd_curr; | |
533 | struct net_device_stats *stats = &priv->stats; | |
534 | __le32 *info = &priv->txbd[*txbd_curr].info; | |
535 | dma_addr_t addr; | |
536 | ||
537 | if (skb_padto(skb, ETH_ZLEN)) | |
538 | return NETDEV_TX_OK; | |
539 | ||
540 | len = max_t(unsigned int, ETH_ZLEN, skb->len); | |
541 | ||
542 | /* EMAC still holds this buffer in its possession. | |
543 | * CPU must not modify this buffer descriptor | |
544 | */ | |
545 | if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC)) { | |
546 | netif_stop_queue(ndev); | |
547 | return NETDEV_TX_BUSY; | |
548 | } | |
549 | ||
550 | addr = dma_map_single(&ndev->dev, (void *)skb->data, len, | |
551 | DMA_TO_DEVICE); | |
552 | ||
553 | if (unlikely(dma_mapping_error(&ndev->dev, addr))) { | |
554 | stats->tx_dropped++; | |
555 | stats->tx_errors++; | |
556 | dev_kfree_skb(skb); | |
557 | return NETDEV_TX_OK; | |
558 | } | |
a4a1139b | 559 | dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr); |
e4f2379d AB |
560 | dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len); |
561 | ||
562 | priv->tx_buff[*txbd_curr].skb = skb; | |
a4a1139b | 563 | priv->txbd[*txbd_curr].data = cpu_to_le32(addr); |
e4f2379d AB |
564 | |
565 | /* Make sure pointer to data buffer is set */ | |
566 | wmb(); | |
567 | ||
568 | *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len); | |
569 | ||
570 | /* Increment index to point to the next BD */ | |
571 | *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM; | |
572 | ||
573 | /* Get "info" of the next BD */ | |
574 | info = &priv->txbd[*txbd_curr].info; | |
575 | ||
576 | /* Check if if Tx BD ring is full - next BD is still owned by EMAC */ | |
577 | if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC)) | |
578 | netif_stop_queue(ndev); | |
579 | ||
580 | arc_reg_set(priv, R_STATUS, TXPL_MASK); | |
581 | ||
582 | skb_tx_timestamp(skb); | |
583 | ||
584 | return NETDEV_TX_OK; | |
585 | } | |
586 | ||
587 | /** | |
588 | * arc_emac_set_address - Set the MAC address for this device. | |
589 | * @ndev: Pointer to net_device structure. | |
590 | * @p: 6 byte Address to be written as MAC address. | |
591 | * | |
592 | * This function copies the HW address from the sockaddr structure to the | |
593 | * net_device structure and updates the address in HW. | |
594 | * | |
595 | * returns: -EBUSY if the net device is busy or 0 if the address is set | |
596 | * successfully. | |
597 | */ | |
598 | static int arc_emac_set_address(struct net_device *ndev, void *p) | |
599 | { | |
600 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
601 | struct sockaddr *addr = p; | |
602 | unsigned int addr_low, addr_hi; | |
603 | ||
604 | if (netif_running(ndev)) | |
605 | return -EBUSY; | |
606 | ||
607 | if (!is_valid_ether_addr(addr->sa_data)) | |
608 | return -EADDRNOTAVAIL; | |
609 | ||
610 | memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len); | |
611 | ||
612 | addr_low = le32_to_cpu(*(__le32 *) &ndev->dev_addr[0]); | |
613 | addr_hi = le16_to_cpu(*(__le16 *) &ndev->dev_addr[4]); | |
614 | ||
615 | arc_reg_set(priv, R_ADDRL, addr_low); | |
616 | arc_reg_set(priv, R_ADDRH, addr_hi); | |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
621 | static const struct net_device_ops arc_emac_netdev_ops = { | |
622 | .ndo_open = arc_emac_open, | |
623 | .ndo_stop = arc_emac_stop, | |
624 | .ndo_start_xmit = arc_emac_tx, | |
625 | .ndo_set_mac_address = arc_emac_set_address, | |
626 | .ndo_get_stats = arc_emac_stats, | |
627 | }; | |
628 | ||
629 | static int arc_emac_probe(struct platform_device *pdev) | |
630 | { | |
631 | struct resource res_regs, res_irq; | |
632 | struct device_node *phy_node; | |
633 | struct arc_emac_priv *priv; | |
634 | struct net_device *ndev; | |
635 | const char *mac_addr; | |
636 | unsigned int id, clock_frequency; | |
637 | int err; | |
638 | ||
639 | if (!pdev->dev.of_node) | |
640 | return -ENODEV; | |
641 | ||
642 | /* Get PHY from device tree */ | |
643 | phy_node = of_parse_phandle(pdev->dev.of_node, "phy", 0); | |
644 | if (!phy_node) { | |
645 | dev_err(&pdev->dev, "failed to retrieve phy description from device tree\n"); | |
646 | return -ENODEV; | |
647 | } | |
648 | ||
649 | /* Get EMAC registers base address from device tree */ | |
650 | err = of_address_to_resource(pdev->dev.of_node, 0, &res_regs); | |
651 | if (err) { | |
652 | dev_err(&pdev->dev, "failed to retrieve registers base from device tree\n"); | |
653 | return -ENODEV; | |
654 | } | |
655 | ||
656 | /* Get CPU clock frequency from device tree */ | |
657 | if (of_property_read_u32(pdev->dev.of_node, "clock-frequency", | |
658 | &clock_frequency)) { | |
659 | dev_err(&pdev->dev, "failed to retrieve <clock-frequency> from device tree\n"); | |
660 | return -EINVAL; | |
661 | } | |
662 | ||
663 | /* Get IRQ from device tree */ | |
664 | err = of_irq_to_resource(pdev->dev.of_node, 0, &res_irq); | |
665 | if (!err) { | |
666 | dev_err(&pdev->dev, "failed to retrieve <irq> value from device tree\n"); | |
667 | return -ENODEV; | |
668 | } | |
669 | ||
670 | ndev = alloc_etherdev(sizeof(struct arc_emac_priv)); | |
671 | if (!ndev) | |
672 | return -ENOMEM; | |
673 | ||
674 | SET_NETDEV_DEV(ndev, &pdev->dev); | |
675 | ||
676 | ndev->netdev_ops = &arc_emac_netdev_ops; | |
677 | ndev->ethtool_ops = &arc_emac_ethtool_ops; | |
678 | ndev->watchdog_timeo = TX_TIMEOUT; | |
679 | /* FIXME :: no multicast support yet */ | |
680 | ndev->flags &= ~IFF_MULTICAST; | |
681 | ||
682 | priv = netdev_priv(ndev); | |
683 | priv->dev = &pdev->dev; | |
684 | priv->ndev = ndev; | |
685 | ||
686 | priv->regs = devm_ioremap_resource(&pdev->dev, &res_regs); | |
687 | if (IS_ERR(priv->regs)) { | |
688 | err = PTR_ERR(priv->regs); | |
689 | goto out; | |
690 | } | |
691 | dev_dbg(&pdev->dev, "Registers base address is 0x%p\n", priv->regs); | |
692 | ||
693 | id = arc_reg_get(priv, R_ID); | |
694 | ||
695 | /* Check for EMAC revision 5 or 7, magic number */ | |
696 | if (!(id == 0x0005fd02 || id == 0x0007fd02)) { | |
697 | dev_err(&pdev->dev, "ARC EMAC not detected, id=0x%x\n", id); | |
698 | err = -ENODEV; | |
699 | goto out; | |
700 | } | |
701 | dev_info(&pdev->dev, "ARC EMAC detected with id: 0x%x\n", id); | |
702 | ||
703 | /* Set poll rate so that it polls every 1 ms */ | |
704 | arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000); | |
705 | ||
706 | /* Get max speed of operation from device tree */ | |
707 | if (of_property_read_u32(pdev->dev.of_node, "max-speed", | |
708 | &priv->max_speed)) { | |
709 | dev_err(&pdev->dev, "failed to retrieve <max-speed> from device tree\n"); | |
710 | err = -EINVAL; | |
711 | goto out; | |
712 | } | |
713 | ||
714 | ndev->irq = res_irq.start; | |
715 | dev_info(&pdev->dev, "IRQ is %d\n", ndev->irq); | |
716 | ||
717 | /* Register interrupt handler for device */ | |
718 | err = devm_request_irq(&pdev->dev, ndev->irq, arc_emac_intr, 0, | |
719 | ndev->name, ndev); | |
720 | if (err) { | |
721 | dev_err(&pdev->dev, "could not allocate IRQ\n"); | |
722 | goto out; | |
723 | } | |
724 | ||
725 | /* Get MAC address from device tree */ | |
726 | mac_addr = of_get_mac_address(pdev->dev.of_node); | |
727 | ||
728 | if (!mac_addr || !is_valid_ether_addr(mac_addr)) | |
729 | eth_hw_addr_random(ndev); | |
730 | else | |
731 | memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); | |
732 | ||
733 | dev_info(&pdev->dev, "MAC address is now %pM\n", ndev->dev_addr); | |
734 | ||
735 | /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */ | |
736 | priv->rxbd = dmam_alloc_coherent(&pdev->dev, RX_RING_SZ + TX_RING_SZ, | |
737 | &priv->rxbd_dma, GFP_KERNEL); | |
738 | ||
739 | if (!priv->rxbd) { | |
740 | dev_err(&pdev->dev, "failed to allocate data buffers\n"); | |
741 | err = -ENOMEM; | |
742 | goto out; | |
743 | } | |
744 | ||
745 | priv->txbd = priv->rxbd + RX_BD_NUM; | |
746 | ||
747 | priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ; | |
748 | dev_dbg(&pdev->dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n", | |
749 | (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma); | |
750 | ||
751 | err = arc_mdio_probe(pdev, priv); | |
752 | if (err) { | |
753 | dev_err(&pdev->dev, "failed to probe MII bus\n"); | |
754 | goto out; | |
755 | } | |
756 | ||
757 | priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0, | |
758 | PHY_INTERFACE_MODE_MII); | |
759 | if (!priv->phy_dev) { | |
760 | dev_err(&pdev->dev, "of_phy_connect() failed\n"); | |
761 | err = -ENODEV; | |
762 | goto out; | |
763 | } | |
764 | ||
765 | dev_info(&pdev->dev, "connected to %s phy with id 0x%x\n", | |
766 | priv->phy_dev->drv->name, priv->phy_dev->phy_id); | |
767 | ||
768 | netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT); | |
769 | ||
770 | err = register_netdev(ndev); | |
771 | if (err) { | |
772 | netif_napi_del(&priv->napi); | |
773 | dev_err(&pdev->dev, "failed to register network device\n"); | |
774 | goto out; | |
775 | } | |
776 | ||
777 | return 0; | |
778 | ||
779 | out: | |
780 | free_netdev(ndev); | |
781 | return err; | |
782 | } | |
783 | ||
784 | static int arc_emac_remove(struct platform_device *pdev) | |
785 | { | |
786 | struct net_device *ndev = platform_get_drvdata(pdev); | |
787 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
788 | ||
789 | phy_disconnect(priv->phy_dev); | |
790 | priv->phy_dev = NULL; | |
791 | arc_mdio_remove(priv); | |
792 | unregister_netdev(ndev); | |
793 | netif_napi_del(&priv->napi); | |
794 | free_netdev(ndev); | |
795 | ||
796 | return 0; | |
797 | } | |
798 | ||
799 | static const struct of_device_id arc_emac_dt_ids[] = { | |
800 | { .compatible = "snps,arc-emac" }, | |
801 | { /* Sentinel */ } | |
802 | }; | |
803 | MODULE_DEVICE_TABLE(of, arc_emac_dt_ids); | |
804 | ||
805 | static struct platform_driver arc_emac_driver = { | |
806 | .probe = arc_emac_probe, | |
807 | .remove = arc_emac_remove, | |
808 | .driver = { | |
809 | .name = DRV_NAME, | |
810 | .owner = THIS_MODULE, | |
811 | .of_match_table = arc_emac_dt_ids, | |
812 | }, | |
813 | }; | |
814 | ||
815 | module_platform_driver(arc_emac_driver); | |
816 | ||
817 | MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>"); | |
818 | MODULE_DESCRIPTION("ARC EMAC driver"); | |
819 | MODULE_LICENSE("GPL"); |