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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 | ||
e4f2379d | 29 | |
74dd40bc BG |
30 | /** |
31 | * arc_emac_tx_avail - Return the number of available slots in the tx ring. | |
32 | * @priv: Pointer to ARC EMAC private data structure. | |
33 | * | |
34 | * returns: the number of slots available for transmission in tx the ring. | |
35 | */ | |
36 | static inline int arc_emac_tx_avail(struct arc_emac_priv *priv) | |
37 | { | |
38 | return (priv->txbd_dirty + TX_BD_NUM - priv->txbd_curr - 1) % TX_BD_NUM; | |
39 | } | |
40 | ||
e4f2379d AB |
41 | /** |
42 | * arc_emac_adjust_link - Adjust the PHY link duplex. | |
43 | * @ndev: Pointer to the net_device structure. | |
44 | * | |
45 | * This function is called to change the duplex setting after auto negotiation | |
46 | * is done by the PHY. | |
47 | */ | |
48 | static void arc_emac_adjust_link(struct net_device *ndev) | |
49 | { | |
50 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
51 | struct phy_device *phy_dev = priv->phy_dev; | |
52 | unsigned int reg, state_changed = 0; | |
53 | ||
54 | if (priv->link != phy_dev->link) { | |
55 | priv->link = phy_dev->link; | |
56 | state_changed = 1; | |
57 | } | |
58 | ||
59 | if (priv->speed != phy_dev->speed) { | |
60 | priv->speed = phy_dev->speed; | |
61 | state_changed = 1; | |
6eacf311 RP |
62 | if (priv->set_mac_speed) |
63 | priv->set_mac_speed(priv, priv->speed); | |
e4f2379d AB |
64 | } |
65 | ||
66 | if (priv->duplex != phy_dev->duplex) { | |
67 | reg = arc_reg_get(priv, R_CTRL); | |
68 | ||
69 | if (DUPLEX_FULL == phy_dev->duplex) | |
70 | reg |= ENFL_MASK; | |
71 | else | |
72 | reg &= ~ENFL_MASK; | |
73 | ||
74 | arc_reg_set(priv, R_CTRL, reg); | |
75 | priv->duplex = phy_dev->duplex; | |
76 | state_changed = 1; | |
77 | } | |
78 | ||
79 | if (state_changed) | |
80 | phy_print_status(phy_dev); | |
81 | } | |
82 | ||
83 | /** | |
84 | * arc_emac_get_settings - Get PHY settings. | |
85 | * @ndev: Pointer to net_device structure. | |
86 | * @cmd: Pointer to ethtool_cmd structure. | |
87 | * | |
88 | * This implements ethtool command for getting PHY settings. If PHY could | |
89 | * not be found, the function returns -ENODEV. This function calls the | |
90 | * relevant PHY ethtool API to get the PHY settings. | |
91 | * Issue "ethtool ethX" under linux prompt to execute this function. | |
92 | */ | |
93 | static int arc_emac_get_settings(struct net_device *ndev, | |
94 | struct ethtool_cmd *cmd) | |
95 | { | |
96 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
97 | ||
98 | return phy_ethtool_gset(priv->phy_dev, cmd); | |
99 | } | |
100 | ||
101 | /** | |
102 | * arc_emac_set_settings - Set PHY settings as passed in the argument. | |
103 | * @ndev: Pointer to net_device structure. | |
104 | * @cmd: Pointer to ethtool_cmd structure. | |
105 | * | |
106 | * This implements ethtool command for setting various PHY settings. If PHY | |
107 | * could not be found, the function returns -ENODEV. This function calls the | |
108 | * relevant PHY ethtool API to set the PHY. | |
109 | * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this | |
110 | * function. | |
111 | */ | |
112 | static int arc_emac_set_settings(struct net_device *ndev, | |
113 | struct ethtool_cmd *cmd) | |
114 | { | |
115 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
116 | ||
117 | if (!capable(CAP_NET_ADMIN)) | |
118 | return -EPERM; | |
119 | ||
120 | return phy_ethtool_sset(priv->phy_dev, cmd); | |
121 | } | |
122 | ||
123 | /** | |
124 | * arc_emac_get_drvinfo - Get EMAC driver information. | |
125 | * @ndev: Pointer to net_device structure. | |
126 | * @info: Pointer to ethtool_drvinfo structure. | |
127 | * | |
128 | * This implements ethtool command for getting the driver information. | |
129 | * Issue "ethtool -i ethX" under linux prompt to execute this function. | |
130 | */ | |
131 | static void arc_emac_get_drvinfo(struct net_device *ndev, | |
132 | struct ethtool_drvinfo *info) | |
133 | { | |
23d2d9a6 RP |
134 | struct arc_emac_priv *priv = netdev_priv(ndev); |
135 | ||
136 | strlcpy(info->driver, priv->drv_name, sizeof(info->driver)); | |
137 | strlcpy(info->version, priv->drv_version, sizeof(info->version)); | |
e4f2379d AB |
138 | } |
139 | ||
140 | static const struct ethtool_ops arc_emac_ethtool_ops = { | |
141 | .get_settings = arc_emac_get_settings, | |
142 | .set_settings = arc_emac_set_settings, | |
143 | .get_drvinfo = arc_emac_get_drvinfo, | |
144 | .get_link = ethtool_op_get_link, | |
145 | }; | |
146 | ||
147 | #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK) | |
148 | ||
149 | /** | |
150 | * arc_emac_tx_clean - clears processed by EMAC Tx BDs. | |
151 | * @ndev: Pointer to the network device. | |
152 | */ | |
153 | static void arc_emac_tx_clean(struct net_device *ndev) | |
154 | { | |
155 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
ff458f6f | 156 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
157 | unsigned int i; |
158 | ||
159 | for (i = 0; i < TX_BD_NUM; i++) { | |
160 | unsigned int *txbd_dirty = &priv->txbd_dirty; | |
161 | struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty]; | |
162 | struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty]; | |
163 | struct sk_buff *skb = tx_buff->skb; | |
164 | unsigned int info = le32_to_cpu(txbd->info); | |
165 | ||
c278c253 | 166 | if ((info & FOR_EMAC) || !txbd->data || !skb) |
e4f2379d AB |
167 | break; |
168 | ||
169 | if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) { | |
170 | stats->tx_errors++; | |
171 | stats->tx_dropped++; | |
172 | ||
173 | if (info & DEFR) | |
174 | stats->tx_carrier_errors++; | |
175 | ||
176 | if (info & LTCL) | |
177 | stats->collisions++; | |
178 | ||
179 | if (info & UFLO) | |
180 | stats->tx_fifo_errors++; | |
181 | } else if (likely(info & FIRST_OR_LAST_MASK)) { | |
182 | stats->tx_packets++; | |
183 | stats->tx_bytes += skb->len; | |
184 | } | |
185 | ||
a4a1139b AB |
186 | dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr), |
187 | dma_unmap_len(tx_buff, len), DMA_TO_DEVICE); | |
e4f2379d AB |
188 | |
189 | /* return the sk_buff to system */ | |
190 | dev_kfree_skb_irq(skb); | |
191 | ||
192 | txbd->data = 0; | |
193 | txbd->info = 0; | |
c278c253 | 194 | tx_buff->skb = NULL; |
e4f2379d | 195 | |
27082ee1 | 196 | *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM; |
e4f2379d | 197 | } |
74dd40bc BG |
198 | |
199 | /* Ensure that txbd_dirty is visible to tx() before checking | |
200 | * for queue stopped. | |
201 | */ | |
202 | smp_mb(); | |
203 | ||
204 | if (netif_queue_stopped(ndev) && arc_emac_tx_avail(priv)) | |
205 | netif_wake_queue(ndev); | |
e4f2379d AB |
206 | } |
207 | ||
208 | /** | |
209 | * arc_emac_rx - processing of Rx packets. | |
210 | * @ndev: Pointer to the network device. | |
211 | * @budget: How many BDs to process on 1 call. | |
212 | * | |
213 | * returns: Number of processed BDs | |
214 | * | |
215 | * Iterate through Rx BDs and deliver received packages to upper layer. | |
216 | */ | |
217 | static int arc_emac_rx(struct net_device *ndev, int budget) | |
218 | { | |
219 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
220 | unsigned int work_done; | |
221 | ||
9cff866e | 222 | for (work_done = 0; work_done < budget; work_done++) { |
e4f2379d | 223 | unsigned int *last_rx_bd = &priv->last_rx_bd; |
ff458f6f | 224 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
225 | struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; |
226 | struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; | |
e4f2379d AB |
227 | unsigned int pktlen, info = le32_to_cpu(rxbd->info); |
228 | struct sk_buff *skb; | |
229 | dma_addr_t addr; | |
230 | ||
231 | if (unlikely((info & OWN_MASK) == FOR_EMAC)) | |
232 | break; | |
233 | ||
234 | /* Make a note that we saw a packet at this BD. | |
235 | * So next time, driver starts from this + 1 | |
236 | */ | |
237 | *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; | |
238 | ||
239 | if (unlikely((info & FIRST_OR_LAST_MASK) != | |
240 | FIRST_OR_LAST_MASK)) { | |
241 | /* We pre-allocate buffers of MTU size so incoming | |
242 | * packets won't be split/chained. | |
243 | */ | |
244 | if (net_ratelimit()) | |
245 | netdev_err(ndev, "incomplete packet received\n"); | |
246 | ||
247 | /* Return ownership to EMAC */ | |
a4a1139b | 248 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); |
e4f2379d AB |
249 | stats->rx_errors++; |
250 | stats->rx_length_errors++; | |
251 | continue; | |
252 | } | |
253 | ||
254 | pktlen = info & LEN_MASK; | |
255 | stats->rx_packets++; | |
256 | stats->rx_bytes += pktlen; | |
257 | skb = rx_buff->skb; | |
258 | skb_put(skb, pktlen); | |
259 | skb->dev = ndev; | |
260 | skb->protocol = eth_type_trans(skb, ndev); | |
261 | ||
a4a1139b AB |
262 | dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), |
263 | dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); | |
e4f2379d AB |
264 | |
265 | /* Prepare the BD for next cycle */ | |
a4a1139b AB |
266 | rx_buff->skb = netdev_alloc_skb_ip_align(ndev, |
267 | EMAC_BUFFER_SIZE); | |
e4f2379d AB |
268 | if (unlikely(!rx_buff->skb)) { |
269 | stats->rx_errors++; | |
270 | /* Because receive_skb is below, increment rx_dropped */ | |
271 | stats->rx_dropped++; | |
272 | continue; | |
273 | } | |
274 | ||
275 | /* receive_skb only if new skb was allocated to avoid holes */ | |
276 | netif_receive_skb(skb); | |
277 | ||
278 | addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, | |
a4a1139b | 279 | EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); |
e4f2379d AB |
280 | if (dma_mapping_error(&ndev->dev, addr)) { |
281 | if (net_ratelimit()) | |
282 | netdev_err(ndev, "cannot dma map\n"); | |
283 | dev_kfree_skb(rx_buff->skb); | |
284 | stats->rx_errors++; | |
285 | continue; | |
286 | } | |
a4a1139b AB |
287 | dma_unmap_addr_set(rx_buff, addr, addr); |
288 | dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); | |
e4f2379d | 289 | |
a4a1139b | 290 | rxbd->data = cpu_to_le32(addr); |
e4f2379d AB |
291 | |
292 | /* Make sure pointer to data buffer is set */ | |
293 | wmb(); | |
294 | ||
295 | /* Return ownership to EMAC */ | |
a4a1139b | 296 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); |
e4f2379d AB |
297 | } |
298 | ||
299 | return work_done; | |
300 | } | |
301 | ||
302 | /** | |
303 | * arc_emac_poll - NAPI poll handler. | |
304 | * @napi: Pointer to napi_struct structure. | |
305 | * @budget: How many BDs to process on 1 call. | |
306 | * | |
307 | * returns: Number of processed BDs | |
308 | */ | |
309 | static int arc_emac_poll(struct napi_struct *napi, int budget) | |
310 | { | |
311 | struct net_device *ndev = napi->dev; | |
312 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
313 | unsigned int work_done; | |
314 | ||
315 | arc_emac_tx_clean(ndev); | |
316 | ||
317 | work_done = arc_emac_rx(ndev, budget); | |
318 | if (work_done < budget) { | |
319 | napi_complete(napi); | |
7ce7679d | 320 | arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); |
e4f2379d AB |
321 | } |
322 | ||
323 | return work_done; | |
324 | } | |
325 | ||
326 | /** | |
327 | * arc_emac_intr - Global interrupt handler for EMAC. | |
328 | * @irq: irq number. | |
329 | * @dev_instance: device instance. | |
330 | * | |
331 | * returns: IRQ_HANDLED for all cases. | |
332 | * | |
333 | * ARC EMAC has only 1 interrupt line, and depending on bits raised in | |
334 | * STATUS register we may tell what is a reason for interrupt to fire. | |
335 | */ | |
336 | static irqreturn_t arc_emac_intr(int irq, void *dev_instance) | |
337 | { | |
338 | struct net_device *ndev = dev_instance; | |
339 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
ff458f6f | 340 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
341 | unsigned int status; |
342 | ||
343 | status = arc_reg_get(priv, R_STATUS); | |
344 | status &= ~MDIO_MASK; | |
345 | ||
346 | /* Reset all flags except "MDIO complete" */ | |
347 | arc_reg_set(priv, R_STATUS, status); | |
348 | ||
7ce7679d | 349 | if (status & (RXINT_MASK | TXINT_MASK)) { |
e4f2379d | 350 | if (likely(napi_schedule_prep(&priv->napi))) { |
7ce7679d | 351 | arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); |
e4f2379d AB |
352 | __napi_schedule(&priv->napi); |
353 | } | |
354 | } | |
355 | ||
356 | if (status & ERR_MASK) { | |
357 | /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding | |
358 | * 8-bit error counter overrun. | |
359 | */ | |
360 | ||
361 | if (status & MSER_MASK) { | |
362 | stats->rx_missed_errors += 0x100; | |
363 | stats->rx_errors += 0x100; | |
364 | } | |
365 | ||
366 | if (status & RXCR_MASK) { | |
367 | stats->rx_crc_errors += 0x100; | |
368 | stats->rx_errors += 0x100; | |
369 | } | |
370 | ||
371 | if (status & RXFR_MASK) { | |
372 | stats->rx_frame_errors += 0x100; | |
373 | stats->rx_errors += 0x100; | |
374 | } | |
375 | ||
376 | if (status & RXFL_MASK) { | |
377 | stats->rx_over_errors += 0x100; | |
378 | stats->rx_errors += 0x100; | |
379 | } | |
380 | } | |
381 | ||
382 | return IRQ_HANDLED; | |
383 | } | |
384 | ||
5a45e57a BG |
385 | #ifdef CONFIG_NET_POLL_CONTROLLER |
386 | static void arc_emac_poll_controller(struct net_device *dev) | |
387 | { | |
388 | disable_irq(dev->irq); | |
389 | arc_emac_intr(dev->irq, dev); | |
390 | enable_irq(dev->irq); | |
391 | } | |
392 | #endif | |
393 | ||
e4f2379d AB |
394 | /** |
395 | * arc_emac_open - Open the network device. | |
396 | * @ndev: Pointer to the network device. | |
397 | * | |
398 | * returns: 0, on success or non-zero error value on failure. | |
399 | * | |
400 | * This function sets the MAC address, requests and enables an IRQ | |
401 | * for the EMAC device and starts the Tx queue. | |
402 | * It also connects to the phy device. | |
403 | */ | |
404 | static int arc_emac_open(struct net_device *ndev) | |
405 | { | |
406 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
407 | struct phy_device *phy_dev = priv->phy_dev; | |
e4f2379d AB |
408 | int i; |
409 | ||
410 | phy_dev->autoneg = AUTONEG_ENABLE; | |
411 | phy_dev->speed = 0; | |
412 | phy_dev->duplex = 0; | |
b0ac9564 | 413 | phy_dev->advertising &= phy_dev->supported; |
e4f2379d | 414 | |
a4a1139b AB |
415 | priv->last_rx_bd = 0; |
416 | ||
e4f2379d | 417 | /* Allocate and set buffers for Rx BD's */ |
e4f2379d | 418 | for (i = 0; i < RX_BD_NUM; i++) { |
a4a1139b AB |
419 | dma_addr_t addr; |
420 | unsigned int *last_rx_bd = &priv->last_rx_bd; | |
421 | struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; | |
422 | struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; | |
423 | ||
424 | rx_buff->skb = netdev_alloc_skb_ip_align(ndev, | |
425 | EMAC_BUFFER_SIZE); | |
426 | if (unlikely(!rx_buff->skb)) | |
427 | return -ENOMEM; | |
428 | ||
429 | addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, | |
430 | EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); | |
431 | if (dma_mapping_error(&ndev->dev, addr)) { | |
432 | netdev_err(ndev, "cannot dma map\n"); | |
433 | dev_kfree_skb(rx_buff->skb); | |
e4f2379d | 434 | return -ENOMEM; |
a4a1139b AB |
435 | } |
436 | dma_unmap_addr_set(rx_buff, addr, addr); | |
437 | dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); | |
e4f2379d | 438 | |
a4a1139b | 439 | rxbd->data = cpu_to_le32(addr); |
e4f2379d AB |
440 | |
441 | /* Make sure pointer to data buffer is set */ | |
442 | wmb(); | |
443 | ||
a4a1139b AB |
444 | /* Return ownership to EMAC */ |
445 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); | |
e4f2379d | 446 | |
a4a1139b AB |
447 | *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; |
448 | } | |
e4f2379d | 449 | |
99f93a15 AK |
450 | priv->txbd_curr = 0; |
451 | priv->txbd_dirty = 0; | |
452 | ||
e4f2379d AB |
453 | /* Clean Tx BD's */ |
454 | memset(priv->txbd, 0, TX_RING_SZ); | |
455 | ||
456 | /* Initialize logical address filter */ | |
457 | arc_reg_set(priv, R_LAFL, 0); | |
458 | arc_reg_set(priv, R_LAFH, 0); | |
459 | ||
460 | /* Set BD ring pointers for device side */ | |
461 | arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma); | |
462 | arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma); | |
463 | ||
464 | /* Enable interrupts */ | |
7ce7679d | 465 | arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); |
e4f2379d AB |
466 | |
467 | /* Set CONTROL */ | |
468 | arc_reg_set(priv, R_CTRL, | |
469 | (RX_BD_NUM << 24) | /* RX BD table length */ | |
470 | (TX_BD_NUM << 16) | /* TX BD table length */ | |
471 | TXRN_MASK | RXRN_MASK); | |
472 | ||
473 | napi_enable(&priv->napi); | |
474 | ||
475 | /* Enable EMAC */ | |
476 | arc_reg_or(priv, R_CTRL, EN_MASK); | |
477 | ||
478 | phy_start_aneg(priv->phy_dev); | |
479 | ||
480 | netif_start_queue(ndev); | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
775dd682 BG |
485 | /** |
486 | * arc_emac_set_rx_mode - Change the receive filtering mode. | |
487 | * @ndev: Pointer to the network device. | |
488 | * | |
489 | * This function enables/disables promiscuous or all-multicast mode | |
490 | * and updates the multicast filtering list of the network device. | |
491 | */ | |
492 | static void arc_emac_set_rx_mode(struct net_device *ndev) | |
493 | { | |
494 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
495 | ||
496 | if (ndev->flags & IFF_PROMISC) { | |
497 | arc_reg_or(priv, R_CTRL, PROM_MASK); | |
498 | } else { | |
499 | arc_reg_clr(priv, R_CTRL, PROM_MASK); | |
500 | ||
501 | if (ndev->flags & IFF_ALLMULTI) { | |
502 | arc_reg_set(priv, R_LAFL, ~0); | |
503 | arc_reg_set(priv, R_LAFH, ~0); | |
504 | } else { | |
505 | struct netdev_hw_addr *ha; | |
506 | unsigned int filter[2] = { 0, 0 }; | |
507 | int bit; | |
508 | ||
509 | netdev_for_each_mc_addr(ha, ndev) { | |
510 | bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26; | |
511 | filter[bit >> 5] |= 1 << (bit & 31); | |
512 | } | |
513 | ||
514 | arc_reg_set(priv, R_LAFL, filter[0]); | |
515 | arc_reg_set(priv, R_LAFH, filter[1]); | |
516 | } | |
517 | } | |
518 | } | |
519 | ||
b530b164 AK |
520 | /** |
521 | * arc_free_tx_queue - free skb from tx queue | |
522 | * @ndev: Pointer to the network device. | |
523 | * | |
524 | * This function must be called while EMAC disable | |
525 | */ | |
526 | static void arc_free_tx_queue(struct net_device *ndev) | |
527 | { | |
528 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
529 | unsigned int i; | |
530 | ||
531 | for (i = 0; i < TX_BD_NUM; i++) { | |
532 | struct arc_emac_bd *txbd = &priv->txbd[i]; | |
533 | struct buffer_state *tx_buff = &priv->tx_buff[i]; | |
534 | ||
535 | if (tx_buff->skb) { | |
536 | dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr), | |
537 | dma_unmap_len(tx_buff, len), DMA_TO_DEVICE); | |
538 | ||
539 | /* return the sk_buff to system */ | |
540 | dev_kfree_skb_irq(tx_buff->skb); | |
541 | } | |
542 | ||
543 | txbd->info = 0; | |
544 | txbd->data = 0; | |
545 | tx_buff->skb = NULL; | |
546 | } | |
547 | } | |
548 | ||
549 | /** | |
550 | * arc_free_rx_queue - free skb from rx queue | |
551 | * @ndev: Pointer to the network device. | |
552 | * | |
553 | * This function must be called while EMAC disable | |
554 | */ | |
555 | static void arc_free_rx_queue(struct net_device *ndev) | |
556 | { | |
557 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
558 | unsigned int i; | |
559 | ||
560 | for (i = 0; i < RX_BD_NUM; i++) { | |
561 | struct arc_emac_bd *rxbd = &priv->rxbd[i]; | |
562 | struct buffer_state *rx_buff = &priv->rx_buff[i]; | |
563 | ||
564 | if (rx_buff->skb) { | |
565 | dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), | |
566 | dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); | |
567 | ||
568 | /* return the sk_buff to system */ | |
569 | dev_kfree_skb_irq(rx_buff->skb); | |
570 | } | |
571 | ||
572 | rxbd->info = 0; | |
573 | rxbd->data = 0; | |
574 | rx_buff->skb = NULL; | |
575 | } | |
576 | } | |
577 | ||
e4f2379d AB |
578 | /** |
579 | * arc_emac_stop - Close the network device. | |
580 | * @ndev: Pointer to the network device. | |
581 | * | |
582 | * This function stops the Tx queue, disables interrupts and frees the IRQ for | |
583 | * the EMAC device. | |
584 | * It also disconnects the PHY device associated with the EMAC device. | |
585 | */ | |
586 | static int arc_emac_stop(struct net_device *ndev) | |
587 | { | |
588 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
589 | ||
590 | napi_disable(&priv->napi); | |
591 | netif_stop_queue(ndev); | |
592 | ||
593 | /* Disable interrupts */ | |
7ce7679d | 594 | arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); |
e4f2379d AB |
595 | |
596 | /* Disable EMAC */ | |
597 | arc_reg_clr(priv, R_CTRL, EN_MASK); | |
598 | ||
b530b164 AK |
599 | /* Return the sk_buff to system */ |
600 | arc_free_tx_queue(ndev); | |
601 | arc_free_rx_queue(ndev); | |
602 | ||
e4f2379d AB |
603 | return 0; |
604 | } | |
605 | ||
606 | /** | |
607 | * arc_emac_stats - Get system network statistics. | |
608 | * @ndev: Pointer to net_device structure. | |
609 | * | |
610 | * Returns the address of the device statistics structure. | |
611 | * Statistics are updated in interrupt handler. | |
612 | */ | |
613 | static struct net_device_stats *arc_emac_stats(struct net_device *ndev) | |
614 | { | |
615 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
ff458f6f | 616 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
617 | unsigned long miss, rxerr; |
618 | u8 rxcrc, rxfram, rxoflow; | |
619 | ||
620 | rxerr = arc_reg_get(priv, R_RXERR); | |
621 | miss = arc_reg_get(priv, R_MISS); | |
622 | ||
623 | rxcrc = rxerr; | |
624 | rxfram = rxerr >> 8; | |
625 | rxoflow = rxerr >> 16; | |
626 | ||
627 | stats->rx_errors += miss; | |
628 | stats->rx_errors += rxcrc + rxfram + rxoflow; | |
629 | ||
630 | stats->rx_over_errors += rxoflow; | |
631 | stats->rx_frame_errors += rxfram; | |
632 | stats->rx_crc_errors += rxcrc; | |
633 | stats->rx_missed_errors += miss; | |
634 | ||
635 | return stats; | |
636 | } | |
637 | ||
638 | /** | |
639 | * arc_emac_tx - Starts the data transmission. | |
640 | * @skb: sk_buff pointer that contains data to be Transmitted. | |
641 | * @ndev: Pointer to net_device structure. | |
642 | * | |
643 | * returns: NETDEV_TX_OK, on success | |
644 | * NETDEV_TX_BUSY, if any of the descriptors are not free. | |
645 | * | |
646 | * This function is invoked from upper layers to initiate transmission. | |
647 | */ | |
648 | static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev) | |
649 | { | |
650 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
651 | unsigned int len, *txbd_curr = &priv->txbd_curr; | |
ff458f6f | 652 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
653 | __le32 *info = &priv->txbd[*txbd_curr].info; |
654 | dma_addr_t addr; | |
655 | ||
656 | if (skb_padto(skb, ETH_ZLEN)) | |
657 | return NETDEV_TX_OK; | |
658 | ||
659 | len = max_t(unsigned int, ETH_ZLEN, skb->len); | |
660 | ||
74dd40bc | 661 | if (unlikely(!arc_emac_tx_avail(priv))) { |
e4f2379d | 662 | netif_stop_queue(ndev); |
74dd40bc | 663 | netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n"); |
e4f2379d AB |
664 | return NETDEV_TX_BUSY; |
665 | } | |
666 | ||
667 | addr = dma_map_single(&ndev->dev, (void *)skb->data, len, | |
668 | DMA_TO_DEVICE); | |
669 | ||
670 | if (unlikely(dma_mapping_error(&ndev->dev, addr))) { | |
671 | stats->tx_dropped++; | |
672 | stats->tx_errors++; | |
673 | dev_kfree_skb(skb); | |
674 | return NETDEV_TX_OK; | |
675 | } | |
a4a1139b | 676 | dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr); |
e4f2379d AB |
677 | dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len); |
678 | ||
a4a1139b | 679 | priv->txbd[*txbd_curr].data = cpu_to_le32(addr); |
e4f2379d AB |
680 | |
681 | /* Make sure pointer to data buffer is set */ | |
682 | wmb(); | |
683 | ||
37ec274e ED |
684 | skb_tx_timestamp(skb); |
685 | ||
e4f2379d AB |
686 | *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len); |
687 | ||
c278c253 AK |
688 | /* Make sure info word is set */ |
689 | wmb(); | |
690 | ||
691 | priv->tx_buff[*txbd_curr].skb = skb; | |
692 | ||
e4f2379d AB |
693 | /* Increment index to point to the next BD */ |
694 | *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM; | |
695 | ||
74dd40bc BG |
696 | /* Ensure that tx_clean() sees the new txbd_curr before |
697 | * checking the queue status. This prevents an unneeded wake | |
698 | * of the queue in tx_clean(). | |
699 | */ | |
700 | smp_mb(); | |
e4f2379d | 701 | |
74dd40bc | 702 | if (!arc_emac_tx_avail(priv)) { |
e4f2379d | 703 | netif_stop_queue(ndev); |
74dd40bc BG |
704 | /* Refresh tx_dirty */ |
705 | smp_mb(); | |
706 | if (arc_emac_tx_avail(priv)) | |
707 | netif_start_queue(ndev); | |
708 | } | |
e4f2379d AB |
709 | |
710 | arc_reg_set(priv, R_STATUS, TXPL_MASK); | |
711 | ||
e4f2379d AB |
712 | return NETDEV_TX_OK; |
713 | } | |
714 | ||
235a251a MS |
715 | static void arc_emac_set_address_internal(struct net_device *ndev) |
716 | { | |
717 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
718 | unsigned int addr_low, addr_hi; | |
719 | ||
720 | addr_low = le32_to_cpu(*(__le32 *) &ndev->dev_addr[0]); | |
721 | addr_hi = le16_to_cpu(*(__le16 *) &ndev->dev_addr[4]); | |
722 | ||
723 | arc_reg_set(priv, R_ADDRL, addr_low); | |
724 | arc_reg_set(priv, R_ADDRH, addr_hi); | |
725 | } | |
726 | ||
e4f2379d AB |
727 | /** |
728 | * arc_emac_set_address - Set the MAC address for this device. | |
729 | * @ndev: Pointer to net_device structure. | |
730 | * @p: 6 byte Address to be written as MAC address. | |
731 | * | |
732 | * This function copies the HW address from the sockaddr structure to the | |
733 | * net_device structure and updates the address in HW. | |
734 | * | |
735 | * returns: -EBUSY if the net device is busy or 0 if the address is set | |
736 | * successfully. | |
737 | */ | |
738 | static int arc_emac_set_address(struct net_device *ndev, void *p) | |
739 | { | |
e4f2379d | 740 | struct sockaddr *addr = p; |
e4f2379d AB |
741 | |
742 | if (netif_running(ndev)) | |
743 | return -EBUSY; | |
744 | ||
745 | if (!is_valid_ether_addr(addr->sa_data)) | |
746 | return -EADDRNOTAVAIL; | |
747 | ||
748 | memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len); | |
749 | ||
235a251a | 750 | arc_emac_set_address_internal(ndev); |
e4f2379d AB |
751 | |
752 | return 0; | |
753 | } | |
754 | ||
755 | static const struct net_device_ops arc_emac_netdev_ops = { | |
756 | .ndo_open = arc_emac_open, | |
757 | .ndo_stop = arc_emac_stop, | |
758 | .ndo_start_xmit = arc_emac_tx, | |
759 | .ndo_set_mac_address = arc_emac_set_address, | |
760 | .ndo_get_stats = arc_emac_stats, | |
775dd682 | 761 | .ndo_set_rx_mode = arc_emac_set_rx_mode, |
5a45e57a BG |
762 | #ifdef CONFIG_NET_POLL_CONTROLLER |
763 | .ndo_poll_controller = arc_emac_poll_controller, | |
764 | #endif | |
e4f2379d AB |
765 | }; |
766 | ||
23d2d9a6 | 767 | int arc_emac_probe(struct net_device *ndev, int interface) |
e4f2379d | 768 | { |
23d2d9a6 | 769 | struct device *dev = ndev->dev.parent; |
f7578496 | 770 | struct resource res_regs; |
e4f2379d AB |
771 | struct device_node *phy_node; |
772 | struct arc_emac_priv *priv; | |
e4f2379d | 773 | const char *mac_addr; |
f7578496 | 774 | unsigned int id, clock_frequency, irq; |
e4f2379d AB |
775 | int err; |
776 | ||
e4f2379d AB |
777 | |
778 | /* Get PHY from device tree */ | |
f15f44e0 | 779 | phy_node = of_parse_phandle(dev->of_node, "phy", 0); |
e4f2379d | 780 | if (!phy_node) { |
f15f44e0 | 781 | dev_err(dev, "failed to retrieve phy description from device tree\n"); |
e4f2379d AB |
782 | return -ENODEV; |
783 | } | |
784 | ||
785 | /* Get EMAC registers base address from device tree */ | |
f15f44e0 | 786 | err = of_address_to_resource(dev->of_node, 0, &res_regs); |
e4f2379d | 787 | if (err) { |
f15f44e0 | 788 | dev_err(dev, "failed to retrieve registers base from device tree\n"); |
e4f2379d AB |
789 | return -ENODEV; |
790 | } | |
791 | ||
e4f2379d | 792 | /* Get IRQ from device tree */ |
f15f44e0 | 793 | irq = irq_of_parse_and_map(dev->of_node, 0); |
f7578496 | 794 | if (!irq) { |
f15f44e0 | 795 | dev_err(dev, "failed to retrieve <irq> value from device tree\n"); |
e4f2379d AB |
796 | return -ENODEV; |
797 | } | |
798 | ||
e4f2379d AB |
799 | |
800 | ndev->netdev_ops = &arc_emac_netdev_ops; | |
801 | ndev->ethtool_ops = &arc_emac_ethtool_ops; | |
802 | ndev->watchdog_timeo = TX_TIMEOUT; | |
803 | /* FIXME :: no multicast support yet */ | |
804 | ndev->flags &= ~IFF_MULTICAST; | |
805 | ||
806 | priv = netdev_priv(ndev); | |
f15f44e0 | 807 | priv->dev = dev; |
e4f2379d | 808 | |
f15f44e0 | 809 | priv->regs = devm_ioremap_resource(dev, &res_regs); |
e4f2379d | 810 | if (IS_ERR(priv->regs)) { |
23d2d9a6 | 811 | return PTR_ERR(priv->regs); |
e4f2379d | 812 | } |
f15f44e0 | 813 | dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs); |
e4f2379d | 814 | |
23d2d9a6 | 815 | if (priv->clk) { |
88154c96 HS |
816 | err = clk_prepare_enable(priv->clk); |
817 | if (err) { | |
f15f44e0 | 818 | dev_err(dev, "failed to enable clock\n"); |
23d2d9a6 | 819 | return err; |
88154c96 HS |
820 | } |
821 | ||
822 | clock_frequency = clk_get_rate(priv->clk); | |
23d2d9a6 RP |
823 | } else { |
824 | /* Get CPU clock frequency from device tree */ | |
825 | if (of_property_read_u32(dev->of_node, "clock-frequency", | |
826 | &clock_frequency)) { | |
827 | dev_err(dev, "failed to retrieve <clock-frequency> from device tree\n"); | |
828 | return -EINVAL; | |
829 | } | |
88154c96 HS |
830 | } |
831 | ||
e4f2379d AB |
832 | id = arc_reg_get(priv, R_ID); |
833 | ||
834 | /* Check for EMAC revision 5 or 7, magic number */ | |
835 | if (!(id == 0x0005fd02 || id == 0x0007fd02)) { | |
f15f44e0 | 836 | dev_err(dev, "ARC EMAC not detected, id=0x%x\n", id); |
e4f2379d | 837 | err = -ENODEV; |
88154c96 | 838 | goto out_clken; |
e4f2379d | 839 | } |
f15f44e0 | 840 | dev_info(dev, "ARC EMAC detected with id: 0x%x\n", id); |
e4f2379d AB |
841 | |
842 | /* Set poll rate so that it polls every 1 ms */ | |
843 | arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000); | |
844 | ||
f7578496 | 845 | ndev->irq = irq; |
f15f44e0 | 846 | dev_info(dev, "IRQ is %d\n", ndev->irq); |
e4f2379d AB |
847 | |
848 | /* Register interrupt handler for device */ | |
f15f44e0 | 849 | err = devm_request_irq(dev, ndev->irq, arc_emac_intr, 0, |
e4f2379d AB |
850 | ndev->name, ndev); |
851 | if (err) { | |
f15f44e0 | 852 | dev_err(dev, "could not allocate IRQ\n"); |
88154c96 | 853 | goto out_clken; |
e4f2379d AB |
854 | } |
855 | ||
856 | /* Get MAC address from device tree */ | |
f15f44e0 | 857 | mac_addr = of_get_mac_address(dev->of_node); |
e4f2379d | 858 | |
99470819 | 859 | if (mac_addr) |
e4f2379d | 860 | memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); |
99470819 LP |
861 | else |
862 | eth_hw_addr_random(ndev); | |
e4f2379d | 863 | |
235a251a | 864 | arc_emac_set_address_internal(ndev); |
f15f44e0 | 865 | dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr); |
e4f2379d AB |
866 | |
867 | /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */ | |
f15f44e0 | 868 | priv->rxbd = dmam_alloc_coherent(dev, RX_RING_SZ + TX_RING_SZ, |
e4f2379d AB |
869 | &priv->rxbd_dma, GFP_KERNEL); |
870 | ||
871 | if (!priv->rxbd) { | |
f15f44e0 | 872 | dev_err(dev, "failed to allocate data buffers\n"); |
e4f2379d | 873 | err = -ENOMEM; |
88154c96 | 874 | goto out_clken; |
e4f2379d AB |
875 | } |
876 | ||
877 | priv->txbd = priv->rxbd + RX_BD_NUM; | |
878 | ||
879 | priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ; | |
f15f44e0 | 880 | dev_dbg(dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n", |
e4f2379d AB |
881 | (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma); |
882 | ||
93e91b3d | 883 | err = arc_mdio_probe(priv); |
e4f2379d | 884 | if (err) { |
f15f44e0 | 885 | dev_err(dev, "failed to probe MII bus\n"); |
88154c96 | 886 | goto out_clken; |
e4f2379d AB |
887 | } |
888 | ||
889 | priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0, | |
23d2d9a6 | 890 | interface); |
e4f2379d | 891 | if (!priv->phy_dev) { |
f15f44e0 | 892 | dev_err(dev, "of_phy_connect() failed\n"); |
e4f2379d | 893 | err = -ENODEV; |
796bec1e | 894 | goto out_mdio; |
e4f2379d AB |
895 | } |
896 | ||
f15f44e0 | 897 | dev_info(dev, "connected to %s phy with id 0x%x\n", |
e4f2379d AB |
898 | priv->phy_dev->drv->name, priv->phy_dev->phy_id); |
899 | ||
900 | netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT); | |
901 | ||
902 | err = register_netdev(ndev); | |
903 | if (err) { | |
f15f44e0 | 904 | dev_err(dev, "failed to register network device\n"); |
796bec1e | 905 | goto out_netif_api; |
e4f2379d AB |
906 | } |
907 | ||
908 | return 0; | |
909 | ||
796bec1e HS |
910 | out_netif_api: |
911 | netif_napi_del(&priv->napi); | |
912 | phy_disconnect(priv->phy_dev); | |
913 | priv->phy_dev = NULL; | |
914 | out_mdio: | |
915 | arc_mdio_remove(priv); | |
88154c96 | 916 | out_clken: |
23d2d9a6 | 917 | if (priv->clk) |
88154c96 | 918 | clk_disable_unprepare(priv->clk); |
e4f2379d AB |
919 | return err; |
920 | } | |
23d2d9a6 | 921 | EXPORT_SYMBOL_GPL(arc_emac_probe); |
e4f2379d | 922 | |
23d2d9a6 | 923 | int arc_emac_remove(struct net_device *ndev) |
e4f2379d | 924 | { |
e4f2379d AB |
925 | struct arc_emac_priv *priv = netdev_priv(ndev); |
926 | ||
927 | phy_disconnect(priv->phy_dev); | |
928 | priv->phy_dev = NULL; | |
929 | arc_mdio_remove(priv); | |
930 | unregister_netdev(ndev); | |
931 | netif_napi_del(&priv->napi); | |
88154c96 HS |
932 | |
933 | if (!IS_ERR(priv->clk)) { | |
934 | clk_disable_unprepare(priv->clk); | |
88154c96 HS |
935 | } |
936 | ||
e4f2379d AB |
937 | |
938 | return 0; | |
939 | } | |
23d2d9a6 | 940 | EXPORT_SYMBOL_GPL(arc_emac_remove); |
e4f2379d AB |
941 | |
942 | MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>"); | |
943 | MODULE_DESCRIPTION("ARC EMAC driver"); | |
944 | MODULE_LICENSE("GPL"); |