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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 | ||
74dd40bc BG |
29 | /** |
30 | * arc_emac_tx_avail - Return the number of available slots in the tx ring. | |
31 | * @priv: Pointer to ARC EMAC private data structure. | |
32 | * | |
33 | * returns: the number of slots available for transmission in tx the ring. | |
34 | */ | |
35 | static inline int arc_emac_tx_avail(struct arc_emac_priv *priv) | |
36 | { | |
37 | return (priv->txbd_dirty + TX_BD_NUM - priv->txbd_curr - 1) % TX_BD_NUM; | |
38 | } | |
39 | ||
e4f2379d AB |
40 | /** |
41 | * arc_emac_adjust_link - Adjust the PHY link duplex. | |
42 | * @ndev: Pointer to the net_device structure. | |
43 | * | |
44 | * This function is called to change the duplex setting after auto negotiation | |
45 | * is done by the PHY. | |
46 | */ | |
47 | static void arc_emac_adjust_link(struct net_device *ndev) | |
48 | { | |
49 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
50 | struct phy_device *phy_dev = priv->phy_dev; | |
51 | unsigned int reg, state_changed = 0; | |
52 | ||
53 | if (priv->link != phy_dev->link) { | |
54 | priv->link = phy_dev->link; | |
55 | state_changed = 1; | |
56 | } | |
57 | ||
58 | if (priv->speed != phy_dev->speed) { | |
59 | priv->speed = phy_dev->speed; | |
60 | state_changed = 1; | |
6eacf311 RP |
61 | if (priv->set_mac_speed) |
62 | priv->set_mac_speed(priv, priv->speed); | |
e4f2379d AB |
63 | } |
64 | ||
65 | if (priv->duplex != phy_dev->duplex) { | |
66 | reg = arc_reg_get(priv, R_CTRL); | |
67 | ||
663713eb | 68 | if (phy_dev->duplex == DUPLEX_FULL) |
e4f2379d AB |
69 | reg |= ENFL_MASK; |
70 | else | |
71 | reg &= ~ENFL_MASK; | |
72 | ||
73 | arc_reg_set(priv, R_CTRL, reg); | |
74 | priv->duplex = phy_dev->duplex; | |
75 | state_changed = 1; | |
76 | } | |
77 | ||
78 | if (state_changed) | |
79 | phy_print_status(phy_dev); | |
80 | } | |
81 | ||
82 | /** | |
83 | * arc_emac_get_settings - Get PHY settings. | |
84 | * @ndev: Pointer to net_device structure. | |
85 | * @cmd: Pointer to ethtool_cmd structure. | |
86 | * | |
87 | * This implements ethtool command for getting PHY settings. If PHY could | |
88 | * not be found, the function returns -ENODEV. This function calls the | |
89 | * relevant PHY ethtool API to get the PHY settings. | |
90 | * Issue "ethtool ethX" under linux prompt to execute this function. | |
91 | */ | |
92 | static int arc_emac_get_settings(struct net_device *ndev, | |
93 | struct ethtool_cmd *cmd) | |
94 | { | |
95 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
96 | ||
97 | return phy_ethtool_gset(priv->phy_dev, cmd); | |
98 | } | |
99 | ||
100 | /** | |
101 | * arc_emac_set_settings - Set PHY settings as passed in the argument. | |
102 | * @ndev: Pointer to net_device structure. | |
103 | * @cmd: Pointer to ethtool_cmd structure. | |
104 | * | |
105 | * This implements ethtool command for setting various PHY settings. If PHY | |
106 | * could not be found, the function returns -ENODEV. This function calls the | |
107 | * relevant PHY ethtool API to set the PHY. | |
108 | * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this | |
109 | * function. | |
110 | */ | |
111 | static int arc_emac_set_settings(struct net_device *ndev, | |
112 | struct ethtool_cmd *cmd) | |
113 | { | |
114 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
115 | ||
116 | if (!capable(CAP_NET_ADMIN)) | |
117 | return -EPERM; | |
118 | ||
119 | return phy_ethtool_sset(priv->phy_dev, cmd); | |
120 | } | |
121 | ||
122 | /** | |
123 | * arc_emac_get_drvinfo - Get EMAC driver information. | |
124 | * @ndev: Pointer to net_device structure. | |
125 | * @info: Pointer to ethtool_drvinfo structure. | |
126 | * | |
127 | * This implements ethtool command for getting the driver information. | |
128 | * Issue "ethtool -i ethX" under linux prompt to execute this function. | |
129 | */ | |
130 | static void arc_emac_get_drvinfo(struct net_device *ndev, | |
131 | struct ethtool_drvinfo *info) | |
132 | { | |
23d2d9a6 RP |
133 | struct arc_emac_priv *priv = netdev_priv(ndev); |
134 | ||
135 | strlcpy(info->driver, priv->drv_name, sizeof(info->driver)); | |
136 | strlcpy(info->version, priv->drv_version, sizeof(info->version)); | |
e4f2379d AB |
137 | } |
138 | ||
139 | static const struct ethtool_ops arc_emac_ethtool_ops = { | |
140 | .get_settings = arc_emac_get_settings, | |
141 | .set_settings = arc_emac_set_settings, | |
142 | .get_drvinfo = arc_emac_get_drvinfo, | |
143 | .get_link = ethtool_op_get_link, | |
144 | }; | |
145 | ||
146 | #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK) | |
147 | ||
148 | /** | |
149 | * arc_emac_tx_clean - clears processed by EMAC Tx BDs. | |
150 | * @ndev: Pointer to the network device. | |
151 | */ | |
152 | static void arc_emac_tx_clean(struct net_device *ndev) | |
153 | { | |
154 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
ff458f6f | 155 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
156 | unsigned int i; |
157 | ||
158 | for (i = 0; i < TX_BD_NUM; i++) { | |
159 | unsigned int *txbd_dirty = &priv->txbd_dirty; | |
160 | struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty]; | |
161 | struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty]; | |
162 | struct sk_buff *skb = tx_buff->skb; | |
163 | unsigned int info = le32_to_cpu(txbd->info); | |
164 | ||
c278c253 | 165 | if ((info & FOR_EMAC) || !txbd->data || !skb) |
e4f2379d AB |
166 | break; |
167 | ||
168 | if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) { | |
169 | stats->tx_errors++; | |
170 | stats->tx_dropped++; | |
171 | ||
172 | if (info & DEFR) | |
173 | stats->tx_carrier_errors++; | |
174 | ||
175 | if (info & LTCL) | |
176 | stats->collisions++; | |
177 | ||
178 | if (info & UFLO) | |
179 | stats->tx_fifo_errors++; | |
180 | } else if (likely(info & FIRST_OR_LAST_MASK)) { | |
181 | stats->tx_packets++; | |
182 | stats->tx_bytes += skb->len; | |
183 | } | |
184 | ||
a4a1139b AB |
185 | dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr), |
186 | dma_unmap_len(tx_buff, len), DMA_TO_DEVICE); | |
e4f2379d AB |
187 | |
188 | /* return the sk_buff to system */ | |
189 | dev_kfree_skb_irq(skb); | |
190 | ||
191 | txbd->data = 0; | |
192 | txbd->info = 0; | |
c278c253 | 193 | tx_buff->skb = NULL; |
e4f2379d | 194 | |
27082ee1 | 195 | *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM; |
e4f2379d | 196 | } |
74dd40bc BG |
197 | |
198 | /* Ensure that txbd_dirty is visible to tx() before checking | |
199 | * for queue stopped. | |
200 | */ | |
201 | smp_mb(); | |
202 | ||
203 | if (netif_queue_stopped(ndev) && arc_emac_tx_avail(priv)) | |
204 | netif_wake_queue(ndev); | |
e4f2379d AB |
205 | } |
206 | ||
207 | /** | |
208 | * arc_emac_rx - processing of Rx packets. | |
209 | * @ndev: Pointer to the network device. | |
210 | * @budget: How many BDs to process on 1 call. | |
211 | * | |
212 | * returns: Number of processed BDs | |
213 | * | |
214 | * Iterate through Rx BDs and deliver received packages to upper layer. | |
215 | */ | |
216 | static int arc_emac_rx(struct net_device *ndev, int budget) | |
217 | { | |
218 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
219 | unsigned int work_done; | |
220 | ||
9cff866e | 221 | for (work_done = 0; work_done < budget; work_done++) { |
e4f2379d | 222 | unsigned int *last_rx_bd = &priv->last_rx_bd; |
ff458f6f | 223 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
224 | struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; |
225 | struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; | |
e4f2379d AB |
226 | unsigned int pktlen, info = le32_to_cpu(rxbd->info); |
227 | struct sk_buff *skb; | |
228 | dma_addr_t addr; | |
229 | ||
230 | if (unlikely((info & OWN_MASK) == FOR_EMAC)) | |
231 | break; | |
232 | ||
233 | /* Make a note that we saw a packet at this BD. | |
234 | * So next time, driver starts from this + 1 | |
235 | */ | |
236 | *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; | |
237 | ||
238 | if (unlikely((info & FIRST_OR_LAST_MASK) != | |
239 | FIRST_OR_LAST_MASK)) { | |
240 | /* We pre-allocate buffers of MTU size so incoming | |
241 | * packets won't be split/chained. | |
242 | */ | |
243 | if (net_ratelimit()) | |
244 | netdev_err(ndev, "incomplete packet received\n"); | |
245 | ||
246 | /* Return ownership to EMAC */ | |
a4a1139b | 247 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); |
e4f2379d AB |
248 | stats->rx_errors++; |
249 | stats->rx_length_errors++; | |
250 | continue; | |
251 | } | |
252 | ||
253 | pktlen = info & LEN_MASK; | |
254 | stats->rx_packets++; | |
255 | stats->rx_bytes += pktlen; | |
256 | skb = rx_buff->skb; | |
257 | skb_put(skb, pktlen); | |
258 | skb->dev = ndev; | |
259 | skb->protocol = eth_type_trans(skb, ndev); | |
260 | ||
a4a1139b AB |
261 | dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), |
262 | dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); | |
e4f2379d AB |
263 | |
264 | /* Prepare the BD for next cycle */ | |
a4a1139b AB |
265 | rx_buff->skb = netdev_alloc_skb_ip_align(ndev, |
266 | EMAC_BUFFER_SIZE); | |
e4f2379d AB |
267 | if (unlikely(!rx_buff->skb)) { |
268 | stats->rx_errors++; | |
269 | /* Because receive_skb is below, increment rx_dropped */ | |
270 | stats->rx_dropped++; | |
271 | continue; | |
272 | } | |
273 | ||
274 | /* receive_skb only if new skb was allocated to avoid holes */ | |
275 | netif_receive_skb(skb); | |
276 | ||
277 | addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, | |
a4a1139b | 278 | EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); |
e4f2379d AB |
279 | if (dma_mapping_error(&ndev->dev, addr)) { |
280 | if (net_ratelimit()) | |
281 | netdev_err(ndev, "cannot dma map\n"); | |
282 | dev_kfree_skb(rx_buff->skb); | |
283 | stats->rx_errors++; | |
284 | continue; | |
285 | } | |
a4a1139b AB |
286 | dma_unmap_addr_set(rx_buff, addr, addr); |
287 | dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); | |
e4f2379d | 288 | |
a4a1139b | 289 | rxbd->data = cpu_to_le32(addr); |
e4f2379d AB |
290 | |
291 | /* Make sure pointer to data buffer is set */ | |
292 | wmb(); | |
293 | ||
294 | /* Return ownership to EMAC */ | |
a4a1139b | 295 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); |
e4f2379d AB |
296 | } |
297 | ||
298 | return work_done; | |
299 | } | |
300 | ||
301 | /** | |
302 | * arc_emac_poll - NAPI poll handler. | |
303 | * @napi: Pointer to napi_struct structure. | |
304 | * @budget: How many BDs to process on 1 call. | |
305 | * | |
306 | * returns: Number of processed BDs | |
307 | */ | |
308 | static int arc_emac_poll(struct napi_struct *napi, int budget) | |
309 | { | |
310 | struct net_device *ndev = napi->dev; | |
311 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
312 | unsigned int work_done; | |
313 | ||
314 | arc_emac_tx_clean(ndev); | |
315 | ||
316 | work_done = arc_emac_rx(ndev, budget); | |
317 | if (work_done < budget) { | |
318 | napi_complete(napi); | |
7ce7679d | 319 | arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); |
e4f2379d AB |
320 | } |
321 | ||
322 | return work_done; | |
323 | } | |
324 | ||
325 | /** | |
326 | * arc_emac_intr - Global interrupt handler for EMAC. | |
327 | * @irq: irq number. | |
328 | * @dev_instance: device instance. | |
329 | * | |
330 | * returns: IRQ_HANDLED for all cases. | |
331 | * | |
332 | * ARC EMAC has only 1 interrupt line, and depending on bits raised in | |
333 | * STATUS register we may tell what is a reason for interrupt to fire. | |
334 | */ | |
335 | static irqreturn_t arc_emac_intr(int irq, void *dev_instance) | |
336 | { | |
337 | struct net_device *ndev = dev_instance; | |
338 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
ff458f6f | 339 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
340 | unsigned int status; |
341 | ||
342 | status = arc_reg_get(priv, R_STATUS); | |
343 | status &= ~MDIO_MASK; | |
344 | ||
345 | /* Reset all flags except "MDIO complete" */ | |
346 | arc_reg_set(priv, R_STATUS, status); | |
347 | ||
7ce7679d | 348 | if (status & (RXINT_MASK | TXINT_MASK)) { |
e4f2379d | 349 | if (likely(napi_schedule_prep(&priv->napi))) { |
7ce7679d | 350 | arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); |
e4f2379d AB |
351 | __napi_schedule(&priv->napi); |
352 | } | |
353 | } | |
354 | ||
355 | if (status & ERR_MASK) { | |
356 | /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding | |
357 | * 8-bit error counter overrun. | |
358 | */ | |
359 | ||
360 | if (status & MSER_MASK) { | |
361 | stats->rx_missed_errors += 0x100; | |
362 | stats->rx_errors += 0x100; | |
363 | } | |
364 | ||
365 | if (status & RXCR_MASK) { | |
366 | stats->rx_crc_errors += 0x100; | |
367 | stats->rx_errors += 0x100; | |
368 | } | |
369 | ||
370 | if (status & RXFR_MASK) { | |
371 | stats->rx_frame_errors += 0x100; | |
372 | stats->rx_errors += 0x100; | |
373 | } | |
374 | ||
375 | if (status & RXFL_MASK) { | |
376 | stats->rx_over_errors += 0x100; | |
377 | stats->rx_errors += 0x100; | |
378 | } | |
379 | } | |
380 | ||
381 | return IRQ_HANDLED; | |
382 | } | |
383 | ||
5a45e57a BG |
384 | #ifdef CONFIG_NET_POLL_CONTROLLER |
385 | static void arc_emac_poll_controller(struct net_device *dev) | |
386 | { | |
387 | disable_irq(dev->irq); | |
388 | arc_emac_intr(dev->irq, dev); | |
389 | enable_irq(dev->irq); | |
390 | } | |
391 | #endif | |
392 | ||
e4f2379d AB |
393 | /** |
394 | * arc_emac_open - Open the network device. | |
395 | * @ndev: Pointer to the network device. | |
396 | * | |
397 | * returns: 0, on success or non-zero error value on failure. | |
398 | * | |
399 | * This function sets the MAC address, requests and enables an IRQ | |
400 | * for the EMAC device and starts the Tx queue. | |
401 | * It also connects to the phy device. | |
402 | */ | |
403 | static int arc_emac_open(struct net_device *ndev) | |
404 | { | |
405 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
406 | struct phy_device *phy_dev = priv->phy_dev; | |
e4f2379d AB |
407 | int i; |
408 | ||
409 | phy_dev->autoneg = AUTONEG_ENABLE; | |
410 | phy_dev->speed = 0; | |
411 | phy_dev->duplex = 0; | |
b0ac9564 | 412 | phy_dev->advertising &= phy_dev->supported; |
e4f2379d | 413 | |
a4a1139b AB |
414 | priv->last_rx_bd = 0; |
415 | ||
e4f2379d | 416 | /* Allocate and set buffers for Rx BD's */ |
e4f2379d | 417 | for (i = 0; i < RX_BD_NUM; i++) { |
a4a1139b AB |
418 | dma_addr_t addr; |
419 | unsigned int *last_rx_bd = &priv->last_rx_bd; | |
420 | struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; | |
421 | struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; | |
422 | ||
423 | rx_buff->skb = netdev_alloc_skb_ip_align(ndev, | |
424 | EMAC_BUFFER_SIZE); | |
425 | if (unlikely(!rx_buff->skb)) | |
426 | return -ENOMEM; | |
427 | ||
428 | addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, | |
429 | EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); | |
430 | if (dma_mapping_error(&ndev->dev, addr)) { | |
431 | netdev_err(ndev, "cannot dma map\n"); | |
432 | dev_kfree_skb(rx_buff->skb); | |
e4f2379d | 433 | return -ENOMEM; |
a4a1139b AB |
434 | } |
435 | dma_unmap_addr_set(rx_buff, addr, addr); | |
436 | dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); | |
e4f2379d | 437 | |
a4a1139b | 438 | rxbd->data = cpu_to_le32(addr); |
e4f2379d AB |
439 | |
440 | /* Make sure pointer to data buffer is set */ | |
441 | wmb(); | |
442 | ||
a4a1139b AB |
443 | /* Return ownership to EMAC */ |
444 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); | |
e4f2379d | 445 | |
a4a1139b AB |
446 | *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; |
447 | } | |
e4f2379d | 448 | |
99f93a15 AK |
449 | priv->txbd_curr = 0; |
450 | priv->txbd_dirty = 0; | |
451 | ||
e4f2379d AB |
452 | /* Clean Tx BD's */ |
453 | memset(priv->txbd, 0, TX_RING_SZ); | |
454 | ||
455 | /* Initialize logical address filter */ | |
456 | arc_reg_set(priv, R_LAFL, 0); | |
457 | arc_reg_set(priv, R_LAFH, 0); | |
458 | ||
459 | /* Set BD ring pointers for device side */ | |
460 | arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma); | |
461 | arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma); | |
462 | ||
463 | /* Enable interrupts */ | |
7ce7679d | 464 | arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); |
e4f2379d AB |
465 | |
466 | /* Set CONTROL */ | |
467 | arc_reg_set(priv, R_CTRL, | |
663713eb CW |
468 | (RX_BD_NUM << 24) | /* RX BD table length */ |
469 | (TX_BD_NUM << 16) | /* TX BD table length */ | |
470 | TXRN_MASK | RXRN_MASK); | |
e4f2379d AB |
471 | |
472 | napi_enable(&priv->napi); | |
473 | ||
474 | /* Enable EMAC */ | |
475 | arc_reg_or(priv, R_CTRL, EN_MASK); | |
476 | ||
477 | phy_start_aneg(priv->phy_dev); | |
478 | ||
479 | netif_start_queue(ndev); | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
775dd682 BG |
484 | /** |
485 | * arc_emac_set_rx_mode - Change the receive filtering mode. | |
486 | * @ndev: Pointer to the network device. | |
487 | * | |
488 | * This function enables/disables promiscuous or all-multicast mode | |
489 | * and updates the multicast filtering list of the network device. | |
490 | */ | |
491 | static void arc_emac_set_rx_mode(struct net_device *ndev) | |
492 | { | |
493 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
494 | ||
495 | if (ndev->flags & IFF_PROMISC) { | |
496 | arc_reg_or(priv, R_CTRL, PROM_MASK); | |
497 | } else { | |
498 | arc_reg_clr(priv, R_CTRL, PROM_MASK); | |
499 | ||
500 | if (ndev->flags & IFF_ALLMULTI) { | |
501 | arc_reg_set(priv, R_LAFL, ~0); | |
502 | arc_reg_set(priv, R_LAFH, ~0); | |
503 | } else { | |
504 | struct netdev_hw_addr *ha; | |
505 | unsigned int filter[2] = { 0, 0 }; | |
506 | int bit; | |
507 | ||
508 | netdev_for_each_mc_addr(ha, ndev) { | |
509 | bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26; | |
510 | filter[bit >> 5] |= 1 << (bit & 31); | |
511 | } | |
512 | ||
513 | arc_reg_set(priv, R_LAFL, filter[0]); | |
514 | arc_reg_set(priv, R_LAFH, filter[1]); | |
515 | } | |
516 | } | |
517 | } | |
518 | ||
b530b164 AK |
519 | /** |
520 | * arc_free_tx_queue - free skb from tx queue | |
521 | * @ndev: Pointer to the network device. | |
522 | * | |
523 | * This function must be called while EMAC disable | |
524 | */ | |
525 | static void arc_free_tx_queue(struct net_device *ndev) | |
526 | { | |
527 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
528 | unsigned int i; | |
529 | ||
530 | for (i = 0; i < TX_BD_NUM; i++) { | |
531 | struct arc_emac_bd *txbd = &priv->txbd[i]; | |
532 | struct buffer_state *tx_buff = &priv->tx_buff[i]; | |
533 | ||
534 | if (tx_buff->skb) { | |
663713eb CW |
535 | dma_unmap_single(&ndev->dev, |
536 | dma_unmap_addr(tx_buff, addr), | |
537 | dma_unmap_len(tx_buff, len), | |
538 | DMA_TO_DEVICE); | |
b530b164 AK |
539 | |
540 | /* return the sk_buff to system */ | |
541 | dev_kfree_skb_irq(tx_buff->skb); | |
542 | } | |
543 | ||
544 | txbd->info = 0; | |
545 | txbd->data = 0; | |
546 | tx_buff->skb = NULL; | |
547 | } | |
548 | } | |
549 | ||
550 | /** | |
551 | * arc_free_rx_queue - free skb from rx queue | |
552 | * @ndev: Pointer to the network device. | |
553 | * | |
554 | * This function must be called while EMAC disable | |
555 | */ | |
556 | static void arc_free_rx_queue(struct net_device *ndev) | |
557 | { | |
558 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
559 | unsigned int i; | |
560 | ||
561 | for (i = 0; i < RX_BD_NUM; i++) { | |
562 | struct arc_emac_bd *rxbd = &priv->rxbd[i]; | |
563 | struct buffer_state *rx_buff = &priv->rx_buff[i]; | |
564 | ||
565 | if (rx_buff->skb) { | |
663713eb CW |
566 | dma_unmap_single(&ndev->dev, |
567 | dma_unmap_addr(rx_buff, addr), | |
568 | dma_unmap_len(rx_buff, len), | |
569 | DMA_FROM_DEVICE); | |
b530b164 AK |
570 | |
571 | /* return the sk_buff to system */ | |
572 | dev_kfree_skb_irq(rx_buff->skb); | |
573 | } | |
574 | ||
575 | rxbd->info = 0; | |
576 | rxbd->data = 0; | |
577 | rx_buff->skb = NULL; | |
578 | } | |
579 | } | |
580 | ||
e4f2379d AB |
581 | /** |
582 | * arc_emac_stop - Close the network device. | |
583 | * @ndev: Pointer to the network device. | |
584 | * | |
585 | * This function stops the Tx queue, disables interrupts and frees the IRQ for | |
586 | * the EMAC device. | |
587 | * It also disconnects the PHY device associated with the EMAC device. | |
588 | */ | |
589 | static int arc_emac_stop(struct net_device *ndev) | |
590 | { | |
591 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
592 | ||
593 | napi_disable(&priv->napi); | |
594 | netif_stop_queue(ndev); | |
595 | ||
596 | /* Disable interrupts */ | |
7ce7679d | 597 | arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); |
e4f2379d AB |
598 | |
599 | /* Disable EMAC */ | |
600 | arc_reg_clr(priv, R_CTRL, EN_MASK); | |
601 | ||
b530b164 AK |
602 | /* Return the sk_buff to system */ |
603 | arc_free_tx_queue(ndev); | |
604 | arc_free_rx_queue(ndev); | |
605 | ||
e4f2379d AB |
606 | return 0; |
607 | } | |
608 | ||
609 | /** | |
610 | * arc_emac_stats - Get system network statistics. | |
611 | * @ndev: Pointer to net_device structure. | |
612 | * | |
613 | * Returns the address of the device statistics structure. | |
614 | * Statistics are updated in interrupt handler. | |
615 | */ | |
616 | static struct net_device_stats *arc_emac_stats(struct net_device *ndev) | |
617 | { | |
618 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
ff458f6f | 619 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
620 | unsigned long miss, rxerr; |
621 | u8 rxcrc, rxfram, rxoflow; | |
622 | ||
623 | rxerr = arc_reg_get(priv, R_RXERR); | |
624 | miss = arc_reg_get(priv, R_MISS); | |
625 | ||
626 | rxcrc = rxerr; | |
627 | rxfram = rxerr >> 8; | |
628 | rxoflow = rxerr >> 16; | |
629 | ||
630 | stats->rx_errors += miss; | |
631 | stats->rx_errors += rxcrc + rxfram + rxoflow; | |
632 | ||
633 | stats->rx_over_errors += rxoflow; | |
634 | stats->rx_frame_errors += rxfram; | |
635 | stats->rx_crc_errors += rxcrc; | |
636 | stats->rx_missed_errors += miss; | |
637 | ||
638 | return stats; | |
639 | } | |
640 | ||
641 | /** | |
642 | * arc_emac_tx - Starts the data transmission. | |
643 | * @skb: sk_buff pointer that contains data to be Transmitted. | |
644 | * @ndev: Pointer to net_device structure. | |
645 | * | |
646 | * returns: NETDEV_TX_OK, on success | |
647 | * NETDEV_TX_BUSY, if any of the descriptors are not free. | |
648 | * | |
649 | * This function is invoked from upper layers to initiate transmission. | |
650 | */ | |
651 | static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev) | |
652 | { | |
653 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
654 | unsigned int len, *txbd_curr = &priv->txbd_curr; | |
ff458f6f | 655 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
656 | __le32 *info = &priv->txbd[*txbd_curr].info; |
657 | dma_addr_t addr; | |
658 | ||
659 | if (skb_padto(skb, ETH_ZLEN)) | |
660 | return NETDEV_TX_OK; | |
661 | ||
662 | len = max_t(unsigned int, ETH_ZLEN, skb->len); | |
663 | ||
74dd40bc | 664 | if (unlikely(!arc_emac_tx_avail(priv))) { |
e4f2379d | 665 | netif_stop_queue(ndev); |
74dd40bc | 666 | netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n"); |
e4f2379d AB |
667 | return NETDEV_TX_BUSY; |
668 | } | |
669 | ||
670 | addr = dma_map_single(&ndev->dev, (void *)skb->data, len, | |
671 | DMA_TO_DEVICE); | |
672 | ||
673 | if (unlikely(dma_mapping_error(&ndev->dev, addr))) { | |
674 | stats->tx_dropped++; | |
675 | stats->tx_errors++; | |
676 | dev_kfree_skb(skb); | |
677 | return NETDEV_TX_OK; | |
678 | } | |
a4a1139b | 679 | dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr); |
e4f2379d AB |
680 | dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len); |
681 | ||
a4a1139b | 682 | priv->txbd[*txbd_curr].data = cpu_to_le32(addr); |
e4f2379d AB |
683 | |
684 | /* Make sure pointer to data buffer is set */ | |
685 | wmb(); | |
686 | ||
37ec274e ED |
687 | skb_tx_timestamp(skb); |
688 | ||
e4f2379d AB |
689 | *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len); |
690 | ||
c278c253 AK |
691 | /* Make sure info word is set */ |
692 | wmb(); | |
693 | ||
694 | priv->tx_buff[*txbd_curr].skb = skb; | |
695 | ||
e4f2379d AB |
696 | /* Increment index to point to the next BD */ |
697 | *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM; | |
698 | ||
74dd40bc BG |
699 | /* Ensure that tx_clean() sees the new txbd_curr before |
700 | * checking the queue status. This prevents an unneeded wake | |
701 | * of the queue in tx_clean(). | |
702 | */ | |
703 | smp_mb(); | |
e4f2379d | 704 | |
74dd40bc | 705 | if (!arc_emac_tx_avail(priv)) { |
e4f2379d | 706 | netif_stop_queue(ndev); |
74dd40bc BG |
707 | /* Refresh tx_dirty */ |
708 | smp_mb(); | |
709 | if (arc_emac_tx_avail(priv)) | |
710 | netif_start_queue(ndev); | |
711 | } | |
e4f2379d AB |
712 | |
713 | arc_reg_set(priv, R_STATUS, TXPL_MASK); | |
714 | ||
e4f2379d AB |
715 | return NETDEV_TX_OK; |
716 | } | |
717 | ||
235a251a MS |
718 | static void arc_emac_set_address_internal(struct net_device *ndev) |
719 | { | |
720 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
721 | unsigned int addr_low, addr_hi; | |
722 | ||
663713eb CW |
723 | addr_low = le32_to_cpu(*(__le32 *)&ndev->dev_addr[0]); |
724 | addr_hi = le16_to_cpu(*(__le16 *)&ndev->dev_addr[4]); | |
235a251a MS |
725 | |
726 | arc_reg_set(priv, R_ADDRL, addr_low); | |
727 | arc_reg_set(priv, R_ADDRH, addr_hi); | |
728 | } | |
729 | ||
e4f2379d AB |
730 | /** |
731 | * arc_emac_set_address - Set the MAC address for this device. | |
732 | * @ndev: Pointer to net_device structure. | |
733 | * @p: 6 byte Address to be written as MAC address. | |
734 | * | |
735 | * This function copies the HW address from the sockaddr structure to the | |
736 | * net_device structure and updates the address in HW. | |
737 | * | |
738 | * returns: -EBUSY if the net device is busy or 0 if the address is set | |
739 | * successfully. | |
740 | */ | |
741 | static int arc_emac_set_address(struct net_device *ndev, void *p) | |
742 | { | |
e4f2379d | 743 | struct sockaddr *addr = p; |
e4f2379d AB |
744 | |
745 | if (netif_running(ndev)) | |
746 | return -EBUSY; | |
747 | ||
748 | if (!is_valid_ether_addr(addr->sa_data)) | |
749 | return -EADDRNOTAVAIL; | |
750 | ||
751 | memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len); | |
752 | ||
235a251a | 753 | arc_emac_set_address_internal(ndev); |
e4f2379d AB |
754 | |
755 | return 0; | |
756 | } | |
757 | ||
758 | static const struct net_device_ops arc_emac_netdev_ops = { | |
759 | .ndo_open = arc_emac_open, | |
760 | .ndo_stop = arc_emac_stop, | |
761 | .ndo_start_xmit = arc_emac_tx, | |
762 | .ndo_set_mac_address = arc_emac_set_address, | |
763 | .ndo_get_stats = arc_emac_stats, | |
775dd682 | 764 | .ndo_set_rx_mode = arc_emac_set_rx_mode, |
5a45e57a BG |
765 | #ifdef CONFIG_NET_POLL_CONTROLLER |
766 | .ndo_poll_controller = arc_emac_poll_controller, | |
767 | #endif | |
e4f2379d AB |
768 | }; |
769 | ||
23d2d9a6 | 770 | int arc_emac_probe(struct net_device *ndev, int interface) |
e4f2379d | 771 | { |
23d2d9a6 | 772 | struct device *dev = ndev->dev.parent; |
f7578496 | 773 | struct resource res_regs; |
e4f2379d AB |
774 | struct device_node *phy_node; |
775 | struct arc_emac_priv *priv; | |
e4f2379d | 776 | const char *mac_addr; |
f7578496 | 777 | unsigned int id, clock_frequency, irq; |
e4f2379d AB |
778 | int err; |
779 | ||
e4f2379d | 780 | /* Get PHY from device tree */ |
f15f44e0 | 781 | phy_node = of_parse_phandle(dev->of_node, "phy", 0); |
e4f2379d | 782 | if (!phy_node) { |
f15f44e0 | 783 | dev_err(dev, "failed to retrieve phy description from device tree\n"); |
e4f2379d AB |
784 | return -ENODEV; |
785 | } | |
786 | ||
787 | /* Get EMAC registers base address from device tree */ | |
f15f44e0 | 788 | err = of_address_to_resource(dev->of_node, 0, &res_regs); |
e4f2379d | 789 | if (err) { |
f15f44e0 | 790 | dev_err(dev, "failed to retrieve registers base from device tree\n"); |
e4f2379d AB |
791 | return -ENODEV; |
792 | } | |
793 | ||
e4f2379d | 794 | /* Get IRQ from device tree */ |
f15f44e0 | 795 | irq = irq_of_parse_and_map(dev->of_node, 0); |
f7578496 | 796 | if (!irq) { |
f15f44e0 | 797 | dev_err(dev, "failed to retrieve <irq> value from device tree\n"); |
e4f2379d AB |
798 | return -ENODEV; |
799 | } | |
800 | ||
e4f2379d AB |
801 | ndev->netdev_ops = &arc_emac_netdev_ops; |
802 | ndev->ethtool_ops = &arc_emac_ethtool_ops; | |
803 | ndev->watchdog_timeo = TX_TIMEOUT; | |
804 | /* FIXME :: no multicast support yet */ | |
805 | ndev->flags &= ~IFF_MULTICAST; | |
806 | ||
807 | priv = netdev_priv(ndev); | |
f15f44e0 | 808 | priv->dev = dev; |
e4f2379d | 809 | |
f15f44e0 | 810 | priv->regs = devm_ioremap_resource(dev, &res_regs); |
663713eb | 811 | if (IS_ERR(priv->regs)) |
23d2d9a6 | 812 | return PTR_ERR(priv->regs); |
663713eb | 813 | |
f15f44e0 | 814 | dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs); |
e4f2379d | 815 | |
23d2d9a6 | 816 | if (priv->clk) { |
88154c96 HS |
817 | err = clk_prepare_enable(priv->clk); |
818 | if (err) { | |
f15f44e0 | 819 | dev_err(dev, "failed to enable clock\n"); |
23d2d9a6 | 820 | return err; |
88154c96 HS |
821 | } |
822 | ||
823 | clock_frequency = clk_get_rate(priv->clk); | |
23d2d9a6 RP |
824 | } else { |
825 | /* Get CPU clock frequency from device tree */ | |
826 | if (of_property_read_u32(dev->of_node, "clock-frequency", | |
827 | &clock_frequency)) { | |
828 | dev_err(dev, "failed to retrieve <clock-frequency> from device tree\n"); | |
829 | return -EINVAL; | |
830 | } | |
88154c96 HS |
831 | } |
832 | ||
e4f2379d AB |
833 | id = arc_reg_get(priv, R_ID); |
834 | ||
835 | /* Check for EMAC revision 5 or 7, magic number */ | |
836 | if (!(id == 0x0005fd02 || id == 0x0007fd02)) { | |
f15f44e0 | 837 | dev_err(dev, "ARC EMAC not detected, id=0x%x\n", id); |
e4f2379d | 838 | err = -ENODEV; |
88154c96 | 839 | goto out_clken; |
e4f2379d | 840 | } |
f15f44e0 | 841 | dev_info(dev, "ARC EMAC detected with id: 0x%x\n", id); |
e4f2379d AB |
842 | |
843 | /* Set poll rate so that it polls every 1 ms */ | |
844 | arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000); | |
845 | ||
f7578496 | 846 | ndev->irq = irq; |
f15f44e0 | 847 | dev_info(dev, "IRQ is %d\n", ndev->irq); |
e4f2379d AB |
848 | |
849 | /* Register interrupt handler for device */ | |
f15f44e0 | 850 | err = devm_request_irq(dev, ndev->irq, arc_emac_intr, 0, |
e4f2379d AB |
851 | ndev->name, ndev); |
852 | if (err) { | |
f15f44e0 | 853 | dev_err(dev, "could not allocate IRQ\n"); |
88154c96 | 854 | goto out_clken; |
e4f2379d AB |
855 | } |
856 | ||
857 | /* Get MAC address from device tree */ | |
f15f44e0 | 858 | mac_addr = of_get_mac_address(dev->of_node); |
e4f2379d | 859 | |
99470819 | 860 | if (mac_addr) |
e4f2379d | 861 | memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); |
99470819 LP |
862 | else |
863 | eth_hw_addr_random(ndev); | |
e4f2379d | 864 | |
235a251a | 865 | arc_emac_set_address_internal(ndev); |
f15f44e0 | 866 | dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr); |
e4f2379d AB |
867 | |
868 | /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */ | |
f15f44e0 | 869 | priv->rxbd = dmam_alloc_coherent(dev, RX_RING_SZ + TX_RING_SZ, |
e4f2379d AB |
870 | &priv->rxbd_dma, GFP_KERNEL); |
871 | ||
872 | if (!priv->rxbd) { | |
f15f44e0 | 873 | dev_err(dev, "failed to allocate data buffers\n"); |
e4f2379d | 874 | err = -ENOMEM; |
88154c96 | 875 | goto out_clken; |
e4f2379d AB |
876 | } |
877 | ||
878 | priv->txbd = priv->rxbd + RX_BD_NUM; | |
879 | ||
880 | priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ; | |
f15f44e0 | 881 | dev_dbg(dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n", |
e4f2379d AB |
882 | (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma); |
883 | ||
93e91b3d | 884 | err = arc_mdio_probe(priv); |
e4f2379d | 885 | if (err) { |
f15f44e0 | 886 | dev_err(dev, "failed to probe MII bus\n"); |
88154c96 | 887 | goto out_clken; |
e4f2379d AB |
888 | } |
889 | ||
890 | priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0, | |
23d2d9a6 | 891 | interface); |
e4f2379d | 892 | if (!priv->phy_dev) { |
f15f44e0 | 893 | dev_err(dev, "of_phy_connect() failed\n"); |
e4f2379d | 894 | err = -ENODEV; |
796bec1e | 895 | goto out_mdio; |
e4f2379d AB |
896 | } |
897 | ||
f15f44e0 | 898 | dev_info(dev, "connected to %s phy with id 0x%x\n", |
e4f2379d AB |
899 | priv->phy_dev->drv->name, priv->phy_dev->phy_id); |
900 | ||
901 | netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT); | |
902 | ||
903 | err = register_netdev(ndev); | |
904 | if (err) { | |
f15f44e0 | 905 | dev_err(dev, "failed to register network device\n"); |
796bec1e | 906 | goto out_netif_api; |
e4f2379d AB |
907 | } |
908 | ||
909 | return 0; | |
910 | ||
796bec1e HS |
911 | out_netif_api: |
912 | netif_napi_del(&priv->napi); | |
913 | phy_disconnect(priv->phy_dev); | |
914 | priv->phy_dev = NULL; | |
915 | out_mdio: | |
916 | arc_mdio_remove(priv); | |
88154c96 | 917 | out_clken: |
23d2d9a6 | 918 | if (priv->clk) |
88154c96 | 919 | clk_disable_unprepare(priv->clk); |
e4f2379d AB |
920 | return err; |
921 | } | |
23d2d9a6 | 922 | EXPORT_SYMBOL_GPL(arc_emac_probe); |
e4f2379d | 923 | |
23d2d9a6 | 924 | int arc_emac_remove(struct net_device *ndev) |
e4f2379d | 925 | { |
e4f2379d AB |
926 | struct arc_emac_priv *priv = netdev_priv(ndev); |
927 | ||
928 | phy_disconnect(priv->phy_dev); | |
929 | priv->phy_dev = NULL; | |
930 | arc_mdio_remove(priv); | |
931 | unregister_netdev(ndev); | |
932 | netif_napi_del(&priv->napi); | |
88154c96 | 933 | |
663713eb | 934 | if (!IS_ERR(priv->clk)) |
88154c96 | 935 | clk_disable_unprepare(priv->clk); |
e4f2379d AB |
936 | |
937 | return 0; | |
938 | } | |
23d2d9a6 | 939 | EXPORT_SYMBOL_GPL(arc_emac_remove); |
e4f2379d AB |
940 | |
941 | MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>"); | |
942 | MODULE_DESCRIPTION("ARC EMAC driver"); | |
943 | MODULE_LICENSE("GPL"); |