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52dfc830 MR |
1 | /* |
2 | * Copyright (C) 2015 Mans Rullgard <mans@mansr.com> | |
3 | * | |
4 | * Mostly rewritten, based on driver from Sigma Designs. Original | |
5 | * copyright notice below. | |
6 | * | |
7 | * | |
8 | * Driver for tangox SMP864x/SMP865x/SMP867x/SMP868x builtin Ethernet Mac. | |
9 | * | |
10 | * Copyright (C) 2005 Maxime Bizon <mbizon@freebox.fr> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/etherdevice.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/ethtool.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/platform_device.h> | |
29 | #include <linux/of_device.h> | |
30 | #include <linux/of_mdio.h> | |
31 | #include <linux/of_net.h> | |
32 | #include <linux/dma-mapping.h> | |
33 | #include <linux/phy.h> | |
34 | #include <linux/cache.h> | |
35 | #include <linux/jiffies.h> | |
36 | #include <linux/io.h> | |
37 | #include <linux/iopoll.h> | |
38 | #include <asm/barrier.h> | |
39 | ||
40 | #include "nb8800.h" | |
41 | ||
42 | static void nb8800_tx_done(struct net_device *dev); | |
43 | static int nb8800_dma_stop(struct net_device *dev); | |
44 | ||
45 | static inline u8 nb8800_readb(struct nb8800_priv *priv, int reg) | |
46 | { | |
47 | return readb_relaxed(priv->base + reg); | |
48 | } | |
49 | ||
50 | static inline u32 nb8800_readl(struct nb8800_priv *priv, int reg) | |
51 | { | |
52 | return readl_relaxed(priv->base + reg); | |
53 | } | |
54 | ||
55 | static inline void nb8800_writeb(struct nb8800_priv *priv, int reg, u8 val) | |
56 | { | |
57 | writeb_relaxed(val, priv->base + reg); | |
58 | } | |
59 | ||
60 | static inline void nb8800_writew(struct nb8800_priv *priv, int reg, u16 val) | |
61 | { | |
62 | writew_relaxed(val, priv->base + reg); | |
63 | } | |
64 | ||
65 | static inline void nb8800_writel(struct nb8800_priv *priv, int reg, u32 val) | |
66 | { | |
67 | writel_relaxed(val, priv->base + reg); | |
68 | } | |
69 | ||
70 | static inline void nb8800_maskb(struct nb8800_priv *priv, int reg, | |
71 | u32 mask, u32 val) | |
72 | { | |
73 | u32 old = nb8800_readb(priv, reg); | |
74 | u32 new = (old & ~mask) | (val & mask); | |
75 | ||
76 | if (new != old) | |
77 | nb8800_writeb(priv, reg, new); | |
78 | } | |
79 | ||
80 | static inline void nb8800_maskl(struct nb8800_priv *priv, int reg, | |
81 | u32 mask, u32 val) | |
82 | { | |
83 | u32 old = nb8800_readl(priv, reg); | |
84 | u32 new = (old & ~mask) | (val & mask); | |
85 | ||
86 | if (new != old) | |
87 | nb8800_writel(priv, reg, new); | |
88 | } | |
89 | ||
90 | static inline void nb8800_modb(struct nb8800_priv *priv, int reg, u8 bits, | |
91 | bool set) | |
92 | { | |
93 | nb8800_maskb(priv, reg, bits, set ? bits : 0); | |
94 | } | |
95 | ||
96 | static inline void nb8800_setb(struct nb8800_priv *priv, int reg, u8 bits) | |
97 | { | |
98 | nb8800_maskb(priv, reg, bits, bits); | |
99 | } | |
100 | ||
101 | static inline void nb8800_clearb(struct nb8800_priv *priv, int reg, u8 bits) | |
102 | { | |
103 | nb8800_maskb(priv, reg, bits, 0); | |
104 | } | |
105 | ||
106 | static inline void nb8800_modl(struct nb8800_priv *priv, int reg, u32 bits, | |
107 | bool set) | |
108 | { | |
109 | nb8800_maskl(priv, reg, bits, set ? bits : 0); | |
110 | } | |
111 | ||
112 | static inline void nb8800_setl(struct nb8800_priv *priv, int reg, u32 bits) | |
113 | { | |
114 | nb8800_maskl(priv, reg, bits, bits); | |
115 | } | |
116 | ||
117 | static inline void nb8800_clearl(struct nb8800_priv *priv, int reg, u32 bits) | |
118 | { | |
119 | nb8800_maskl(priv, reg, bits, 0); | |
120 | } | |
121 | ||
122 | static int nb8800_mdio_wait(struct mii_bus *bus) | |
123 | { | |
124 | struct nb8800_priv *priv = bus->priv; | |
125 | u32 val; | |
126 | ||
127 | return readl_poll_timeout_atomic(priv->base + NB8800_MDIO_CMD, | |
128 | val, !(val & MDIO_CMD_GO), 1, 1000); | |
129 | } | |
130 | ||
131 | static int nb8800_mdio_cmd(struct mii_bus *bus, u32 cmd) | |
132 | { | |
133 | struct nb8800_priv *priv = bus->priv; | |
134 | int err; | |
135 | ||
136 | err = nb8800_mdio_wait(bus); | |
137 | if (err) | |
138 | return err; | |
139 | ||
140 | nb8800_writel(priv, NB8800_MDIO_CMD, cmd); | |
141 | udelay(10); | |
142 | nb8800_writel(priv, NB8800_MDIO_CMD, cmd | MDIO_CMD_GO); | |
143 | ||
144 | return nb8800_mdio_wait(bus); | |
145 | } | |
146 | ||
147 | static int nb8800_mdio_read(struct mii_bus *bus, int phy_id, int reg) | |
148 | { | |
149 | struct nb8800_priv *priv = bus->priv; | |
150 | u32 val; | |
151 | int err; | |
152 | ||
153 | err = nb8800_mdio_cmd(bus, MDIO_CMD_ADDR(phy_id) | MDIO_CMD_REG(reg)); | |
154 | if (err) | |
155 | return err; | |
156 | ||
157 | val = nb8800_readl(priv, NB8800_MDIO_STS); | |
158 | if (val & MDIO_STS_ERR) | |
159 | return 0xffff; | |
160 | ||
161 | return val & 0xffff; | |
162 | } | |
163 | ||
164 | static int nb8800_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val) | |
165 | { | |
166 | u32 cmd = MDIO_CMD_ADDR(phy_id) | MDIO_CMD_REG(reg) | | |
167 | MDIO_CMD_DATA(val) | MDIO_CMD_WR; | |
168 | ||
169 | return nb8800_mdio_cmd(bus, cmd); | |
170 | } | |
171 | ||
172 | static void nb8800_mac_tx(struct net_device *dev, bool enable) | |
173 | { | |
174 | struct nb8800_priv *priv = netdev_priv(dev); | |
175 | ||
176 | while (nb8800_readl(priv, NB8800_TXC_CR) & TCR_EN) | |
177 | cpu_relax(); | |
178 | ||
179 | nb8800_modb(priv, NB8800_TX_CTL1, TX_EN, enable); | |
180 | } | |
181 | ||
182 | static void nb8800_mac_rx(struct net_device *dev, bool enable) | |
183 | { | |
184 | nb8800_modb(netdev_priv(dev), NB8800_RX_CTL, RX_EN, enable); | |
185 | } | |
186 | ||
187 | static void nb8800_mac_af(struct net_device *dev, bool enable) | |
188 | { | |
189 | nb8800_modb(netdev_priv(dev), NB8800_RX_CTL, RX_AF_EN, enable); | |
190 | } | |
191 | ||
192 | static void nb8800_start_rx(struct net_device *dev) | |
193 | { | |
194 | nb8800_setl(netdev_priv(dev), NB8800_RXC_CR, RCR_EN); | |
195 | } | |
196 | ||
197 | static int nb8800_alloc_rx(struct net_device *dev, unsigned int i, bool napi) | |
198 | { | |
199 | struct nb8800_priv *priv = netdev_priv(dev); | |
200 | struct nb8800_rx_desc *rxd = &priv->rx_descs[i]; | |
201 | struct nb8800_rx_buf *rxb = &priv->rx_bufs[i]; | |
202 | int size = L1_CACHE_ALIGN(RX_BUF_SIZE); | |
203 | dma_addr_t dma_addr; | |
204 | struct page *page; | |
205 | unsigned long offset; | |
206 | void *data; | |
207 | ||
208 | data = napi ? napi_alloc_frag(size) : netdev_alloc_frag(size); | |
209 | if (!data) | |
210 | return -ENOMEM; | |
211 | ||
212 | page = virt_to_head_page(data); | |
213 | offset = data - page_address(page); | |
214 | ||
215 | dma_addr = dma_map_page(&dev->dev, page, offset, RX_BUF_SIZE, | |
216 | DMA_FROM_DEVICE); | |
217 | ||
218 | if (dma_mapping_error(&dev->dev, dma_addr)) { | |
219 | skb_free_frag(data); | |
220 | return -ENOMEM; | |
221 | } | |
222 | ||
223 | rxb->page = page; | |
224 | rxb->offset = offset; | |
225 | rxd->desc.s_addr = dma_addr; | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | static void nb8800_receive(struct net_device *dev, unsigned int i, | |
231 | unsigned int len) | |
232 | { | |
233 | struct nb8800_priv *priv = netdev_priv(dev); | |
234 | struct nb8800_rx_desc *rxd = &priv->rx_descs[i]; | |
235 | struct page *page = priv->rx_bufs[i].page; | |
236 | int offset = priv->rx_bufs[i].offset; | |
237 | void *data = page_address(page) + offset; | |
238 | dma_addr_t dma = rxd->desc.s_addr; | |
239 | struct sk_buff *skb; | |
240 | unsigned int size; | |
241 | int err; | |
242 | ||
243 | size = len <= RX_COPYBREAK ? len : RX_COPYHDR; | |
244 | ||
245 | skb = napi_alloc_skb(&priv->napi, size); | |
246 | if (!skb) { | |
247 | netdev_err(dev, "rx skb allocation failed\n"); | |
248 | dev->stats.rx_dropped++; | |
249 | return; | |
250 | } | |
251 | ||
252 | if (len <= RX_COPYBREAK) { | |
253 | dma_sync_single_for_cpu(&dev->dev, dma, len, DMA_FROM_DEVICE); | |
254 | memcpy(skb_put(skb, len), data, len); | |
255 | dma_sync_single_for_device(&dev->dev, dma, len, | |
256 | DMA_FROM_DEVICE); | |
257 | } else { | |
258 | err = nb8800_alloc_rx(dev, i, true); | |
259 | if (err) { | |
260 | netdev_err(dev, "rx buffer allocation failed\n"); | |
261 | dev->stats.rx_dropped++; | |
262 | return; | |
263 | } | |
264 | ||
265 | dma_unmap_page(&dev->dev, dma, RX_BUF_SIZE, DMA_FROM_DEVICE); | |
266 | memcpy(skb_put(skb, RX_COPYHDR), data, RX_COPYHDR); | |
267 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, | |
268 | offset + RX_COPYHDR, len - RX_COPYHDR, | |
269 | RX_BUF_SIZE); | |
270 | } | |
271 | ||
272 | skb->protocol = eth_type_trans(skb, dev); | |
273 | napi_gro_receive(&priv->napi, skb); | |
274 | } | |
275 | ||
276 | static void nb8800_rx_error(struct net_device *dev, u32 report) | |
277 | { | |
278 | if (report & RX_LENGTH_ERR) | |
279 | dev->stats.rx_length_errors++; | |
280 | ||
281 | if (report & RX_FCS_ERR) | |
282 | dev->stats.rx_crc_errors++; | |
283 | ||
284 | if (report & RX_FIFO_OVERRUN) | |
285 | dev->stats.rx_fifo_errors++; | |
286 | ||
287 | if (report & RX_ALIGNMENT_ERROR) | |
288 | dev->stats.rx_frame_errors++; | |
289 | ||
290 | dev->stats.rx_errors++; | |
291 | } | |
292 | ||
293 | static int nb8800_poll(struct napi_struct *napi, int budget) | |
294 | { | |
295 | struct net_device *dev = napi->dev; | |
296 | struct nb8800_priv *priv = netdev_priv(dev); | |
297 | struct nb8800_rx_desc *rxd; | |
298 | unsigned int last = priv->rx_eoc; | |
299 | unsigned int next; | |
300 | int work = 0; | |
301 | ||
302 | nb8800_tx_done(dev); | |
303 | ||
304 | again: | |
8bdb2908 | 305 | do { |
52dfc830 MR |
306 | struct nb8800_rx_buf *rxb; |
307 | unsigned int len; | |
308 | ||
309 | next = (last + 1) % RX_DESC_COUNT; | |
310 | ||
311 | rxb = &priv->rx_bufs[next]; | |
312 | rxd = &priv->rx_descs[next]; | |
313 | ||
314 | if (!rxd->report) | |
315 | break; | |
316 | ||
317 | len = RX_BYTES_TRANSFERRED(rxd->report); | |
318 | ||
319 | if (IS_RX_ERROR(rxd->report)) | |
320 | nb8800_rx_error(dev, rxd->report); | |
321 | else | |
322 | nb8800_receive(dev, next, len); | |
323 | ||
324 | dev->stats.rx_packets++; | |
325 | dev->stats.rx_bytes += len; | |
326 | ||
327 | if (rxd->report & RX_MULTICAST_PKT) | |
328 | dev->stats.multicast++; | |
329 | ||
330 | rxd->report = 0; | |
331 | last = next; | |
332 | work++; | |
8bdb2908 | 333 | } while (work < budget); |
52dfc830 MR |
334 | |
335 | if (work) { | |
336 | priv->rx_descs[last].desc.config |= DESC_EOC; | |
337 | wmb(); /* ensure new EOC is written before clearing old */ | |
338 | priv->rx_descs[priv->rx_eoc].desc.config &= ~DESC_EOC; | |
339 | priv->rx_eoc = last; | |
340 | nb8800_start_rx(dev); | |
341 | } | |
342 | ||
343 | if (work < budget) { | |
344 | nb8800_writel(priv, NB8800_RX_ITR, priv->rx_itr_irq); | |
345 | ||
346 | /* If a packet arrived after we last checked but | |
347 | * before writing RX_ITR, the interrupt will be | |
348 | * delayed, so we retrieve it now. | |
349 | */ | |
350 | if (priv->rx_descs[next].report) | |
351 | goto again; | |
352 | ||
353 | napi_complete_done(napi, work); | |
354 | } | |
355 | ||
356 | return work; | |
357 | } | |
358 | ||
359 | static void __nb8800_tx_dma_start(struct net_device *dev) | |
360 | { | |
361 | struct nb8800_priv *priv = netdev_priv(dev); | |
362 | struct nb8800_tx_buf *txb; | |
363 | u32 txc_cr; | |
364 | ||
365 | txb = &priv->tx_bufs[priv->tx_queue]; | |
366 | if (!txb->ready) | |
367 | return; | |
368 | ||
369 | txc_cr = nb8800_readl(priv, NB8800_TXC_CR); | |
370 | if (txc_cr & TCR_EN) | |
371 | return; | |
372 | ||
373 | nb8800_writel(priv, NB8800_TX_DESC_ADDR, txb->dma_desc); | |
374 | wmb(); /* ensure desc addr is written before starting DMA */ | |
375 | nb8800_writel(priv, NB8800_TXC_CR, txc_cr | TCR_EN); | |
376 | ||
377 | priv->tx_queue = (priv->tx_queue + txb->chain_len) % TX_DESC_COUNT; | |
378 | } | |
379 | ||
380 | static void nb8800_tx_dma_start(struct net_device *dev) | |
381 | { | |
382 | struct nb8800_priv *priv = netdev_priv(dev); | |
383 | ||
384 | spin_lock_irq(&priv->tx_lock); | |
385 | __nb8800_tx_dma_start(dev); | |
386 | spin_unlock_irq(&priv->tx_lock); | |
387 | } | |
388 | ||
389 | static void nb8800_tx_dma_start_irq(struct net_device *dev) | |
390 | { | |
391 | struct nb8800_priv *priv = netdev_priv(dev); | |
392 | ||
393 | spin_lock(&priv->tx_lock); | |
394 | __nb8800_tx_dma_start(dev); | |
395 | spin_unlock(&priv->tx_lock); | |
396 | } | |
397 | ||
398 | static int nb8800_xmit(struct sk_buff *skb, struct net_device *dev) | |
399 | { | |
400 | struct nb8800_priv *priv = netdev_priv(dev); | |
401 | struct nb8800_tx_desc *txd; | |
402 | struct nb8800_tx_buf *txb; | |
403 | struct nb8800_dma_desc *desc; | |
404 | dma_addr_t dma_addr; | |
405 | unsigned int dma_len; | |
406 | unsigned int align; | |
407 | unsigned int next; | |
408 | ||
409 | if (atomic_read(&priv->tx_free) <= NB8800_DESC_LOW) { | |
410 | netif_stop_queue(dev); | |
411 | return NETDEV_TX_BUSY; | |
412 | } | |
413 | ||
414 | align = (8 - (uintptr_t)skb->data) & 7; | |
415 | ||
416 | dma_len = skb->len - align; | |
417 | dma_addr = dma_map_single(&dev->dev, skb->data + align, | |
418 | dma_len, DMA_TO_DEVICE); | |
419 | ||
420 | if (dma_mapping_error(&dev->dev, dma_addr)) { | |
421 | netdev_err(dev, "tx dma mapping error\n"); | |
422 | kfree_skb(skb); | |
423 | dev->stats.tx_dropped++; | |
424 | return NETDEV_TX_OK; | |
425 | } | |
426 | ||
427 | if (atomic_dec_return(&priv->tx_free) <= NB8800_DESC_LOW) { | |
428 | netif_stop_queue(dev); | |
429 | skb->xmit_more = 0; | |
430 | } | |
431 | ||
432 | next = priv->tx_next; | |
433 | txb = &priv->tx_bufs[next]; | |
434 | txd = &priv->tx_descs[next]; | |
435 | desc = &txd->desc[0]; | |
436 | ||
437 | next = (next + 1) % TX_DESC_COUNT; | |
438 | ||
439 | if (align) { | |
440 | memcpy(txd->buf, skb->data, align); | |
441 | ||
442 | desc->s_addr = | |
443 | txb->dma_desc + offsetof(struct nb8800_tx_desc, buf); | |
444 | desc->n_addr = txb->dma_desc + sizeof(txd->desc[0]); | |
445 | desc->config = DESC_BTS(2) | DESC_DS | align; | |
446 | ||
447 | desc++; | |
448 | } | |
449 | ||
450 | desc->s_addr = dma_addr; | |
451 | desc->n_addr = priv->tx_bufs[next].dma_desc; | |
452 | desc->config = DESC_BTS(2) | DESC_DS | DESC_EOF | dma_len; | |
453 | ||
454 | if (!skb->xmit_more) | |
455 | desc->config |= DESC_EOC; | |
456 | ||
457 | txb->skb = skb; | |
458 | txb->dma_addr = dma_addr; | |
459 | txb->dma_len = dma_len; | |
460 | ||
461 | if (!priv->tx_chain) { | |
462 | txb->chain_len = 1; | |
463 | priv->tx_chain = txb; | |
464 | } else { | |
465 | priv->tx_chain->chain_len++; | |
466 | } | |
467 | ||
468 | netdev_sent_queue(dev, skb->len); | |
469 | ||
470 | priv->tx_next = next; | |
471 | ||
472 | if (!skb->xmit_more) { | |
473 | smp_wmb(); | |
474 | priv->tx_chain->ready = true; | |
475 | priv->tx_chain = NULL; | |
476 | nb8800_tx_dma_start(dev); | |
477 | } | |
478 | ||
479 | return NETDEV_TX_OK; | |
480 | } | |
481 | ||
482 | static void nb8800_tx_error(struct net_device *dev, u32 report) | |
483 | { | |
484 | if (report & TX_LATE_COLLISION) | |
485 | dev->stats.collisions++; | |
486 | ||
487 | if (report & TX_PACKET_DROPPED) | |
488 | dev->stats.tx_dropped++; | |
489 | ||
490 | if (report & TX_FIFO_UNDERRUN) | |
491 | dev->stats.tx_fifo_errors++; | |
492 | ||
493 | dev->stats.tx_errors++; | |
494 | } | |
495 | ||
496 | static void nb8800_tx_done(struct net_device *dev) | |
497 | { | |
498 | struct nb8800_priv *priv = netdev_priv(dev); | |
499 | unsigned int limit = priv->tx_next; | |
500 | unsigned int done = priv->tx_done; | |
501 | unsigned int packets = 0; | |
502 | unsigned int len = 0; | |
503 | ||
504 | while (done != limit) { | |
505 | struct nb8800_tx_desc *txd = &priv->tx_descs[done]; | |
506 | struct nb8800_tx_buf *txb = &priv->tx_bufs[done]; | |
507 | struct sk_buff *skb; | |
508 | ||
509 | if (!txd->report) | |
510 | break; | |
511 | ||
512 | skb = txb->skb; | |
513 | len += skb->len; | |
514 | ||
515 | dma_unmap_single(&dev->dev, txb->dma_addr, txb->dma_len, | |
516 | DMA_TO_DEVICE); | |
517 | ||
518 | if (IS_TX_ERROR(txd->report)) { | |
519 | nb8800_tx_error(dev, txd->report); | |
520 | kfree_skb(skb); | |
521 | } else { | |
522 | consume_skb(skb); | |
523 | } | |
524 | ||
525 | dev->stats.tx_packets++; | |
526 | dev->stats.tx_bytes += TX_BYTES_TRANSFERRED(txd->report); | |
527 | dev->stats.collisions += TX_EARLY_COLLISIONS(txd->report); | |
528 | ||
529 | txb->skb = NULL; | |
530 | txb->ready = false; | |
531 | txd->report = 0; | |
532 | ||
533 | done = (done + 1) % TX_DESC_COUNT; | |
534 | packets++; | |
535 | } | |
536 | ||
537 | if (packets) { | |
538 | smp_mb__before_atomic(); | |
539 | atomic_add(packets, &priv->tx_free); | |
540 | netdev_completed_queue(dev, packets, len); | |
541 | netif_wake_queue(dev); | |
542 | priv->tx_done = done; | |
543 | } | |
544 | } | |
545 | ||
546 | static irqreturn_t nb8800_irq(int irq, void *dev_id) | |
547 | { | |
548 | struct net_device *dev = dev_id; | |
549 | struct nb8800_priv *priv = netdev_priv(dev); | |
550 | irqreturn_t ret = IRQ_NONE; | |
551 | u32 val; | |
552 | ||
553 | /* tx interrupt */ | |
554 | val = nb8800_readl(priv, NB8800_TXC_SR); | |
555 | if (val) { | |
556 | nb8800_writel(priv, NB8800_TXC_SR, val); | |
557 | ||
558 | if (val & TSR_DI) | |
559 | nb8800_tx_dma_start_irq(dev); | |
560 | ||
561 | if (val & TSR_TI) | |
562 | napi_schedule_irqoff(&priv->napi); | |
563 | ||
564 | if (unlikely(val & TSR_DE)) | |
565 | netdev_err(dev, "TX DMA error\n"); | |
566 | ||
567 | /* should never happen with automatic status retrieval */ | |
568 | if (unlikely(val & TSR_TO)) | |
569 | netdev_err(dev, "TX Status FIFO overflow\n"); | |
570 | ||
571 | ret = IRQ_HANDLED; | |
572 | } | |
573 | ||
574 | /* rx interrupt */ | |
575 | val = nb8800_readl(priv, NB8800_RXC_SR); | |
576 | if (val) { | |
577 | nb8800_writel(priv, NB8800_RXC_SR, val); | |
578 | ||
579 | if (likely(val & (RSR_RI | RSR_DI))) { | |
580 | nb8800_writel(priv, NB8800_RX_ITR, priv->rx_itr_poll); | |
581 | napi_schedule_irqoff(&priv->napi); | |
582 | } | |
583 | ||
584 | if (unlikely(val & RSR_DE)) | |
585 | netdev_err(dev, "RX DMA error\n"); | |
586 | ||
587 | /* should never happen with automatic status retrieval */ | |
588 | if (unlikely(val & RSR_RO)) | |
589 | netdev_err(dev, "RX Status FIFO overflow\n"); | |
590 | ||
591 | ret = IRQ_HANDLED; | |
592 | } | |
593 | ||
594 | return ret; | |
595 | } | |
596 | ||
597 | static void nb8800_mac_config(struct net_device *dev) | |
598 | { | |
599 | struct nb8800_priv *priv = netdev_priv(dev); | |
600 | bool gigabit = priv->speed == SPEED_1000; | |
601 | u32 mac_mode_mask = RGMII_MODE | HALF_DUPLEX | GMAC_MODE; | |
602 | u32 mac_mode = 0; | |
603 | u32 slot_time; | |
604 | u32 phy_clk; | |
605 | u32 ict; | |
606 | ||
607 | if (!priv->duplex) | |
608 | mac_mode |= HALF_DUPLEX; | |
609 | ||
610 | if (gigabit) { | |
611 | if (priv->phy_mode == PHY_INTERFACE_MODE_RGMII) | |
612 | mac_mode |= RGMII_MODE; | |
613 | ||
614 | mac_mode |= GMAC_MODE; | |
615 | phy_clk = 125000000; | |
616 | ||
617 | /* Should be 512 but register is only 8 bits */ | |
618 | slot_time = 255; | |
619 | } else { | |
620 | phy_clk = 25000000; | |
621 | slot_time = 128; | |
622 | } | |
623 | ||
624 | ict = DIV_ROUND_UP(phy_clk, clk_get_rate(priv->clk)); | |
625 | ||
626 | nb8800_writeb(priv, NB8800_IC_THRESHOLD, ict); | |
627 | nb8800_writeb(priv, NB8800_SLOT_TIME, slot_time); | |
628 | nb8800_maskb(priv, NB8800_MAC_MODE, mac_mode_mask, mac_mode); | |
629 | } | |
630 | ||
631 | static void nb8800_pause_config(struct net_device *dev) | |
632 | { | |
633 | struct nb8800_priv *priv = netdev_priv(dev); | |
634 | struct phy_device *phydev = priv->phydev; | |
635 | u32 rxcr; | |
636 | ||
637 | if (priv->pause_aneg) { | |
638 | if (!phydev || !phydev->link) | |
639 | return; | |
640 | ||
641 | priv->pause_rx = phydev->pause; | |
642 | priv->pause_tx = phydev->pause ^ phydev->asym_pause; | |
643 | } | |
644 | ||
645 | nb8800_modb(priv, NB8800_RX_CTL, RX_PAUSE_EN, priv->pause_rx); | |
646 | ||
647 | rxcr = nb8800_readl(priv, NB8800_RXC_CR); | |
648 | if (!!(rxcr & RCR_FL) == priv->pause_tx) | |
649 | return; | |
650 | ||
651 | if (netif_running(dev)) { | |
652 | napi_disable(&priv->napi); | |
653 | netif_tx_lock_bh(dev); | |
654 | nb8800_dma_stop(dev); | |
655 | nb8800_modl(priv, NB8800_RXC_CR, RCR_FL, priv->pause_tx); | |
656 | nb8800_start_rx(dev); | |
657 | netif_tx_unlock_bh(dev); | |
658 | napi_enable(&priv->napi); | |
659 | } else { | |
660 | nb8800_modl(priv, NB8800_RXC_CR, RCR_FL, priv->pause_tx); | |
661 | } | |
662 | } | |
663 | ||
664 | static void nb8800_link_reconfigure(struct net_device *dev) | |
665 | { | |
666 | struct nb8800_priv *priv = netdev_priv(dev); | |
667 | struct phy_device *phydev = priv->phydev; | |
668 | int change = 0; | |
669 | ||
670 | if (phydev->link) { | |
671 | if (phydev->speed != priv->speed) { | |
672 | priv->speed = phydev->speed; | |
673 | change = 1; | |
674 | } | |
675 | ||
676 | if (phydev->duplex != priv->duplex) { | |
677 | priv->duplex = phydev->duplex; | |
678 | change = 1; | |
679 | } | |
680 | ||
681 | if (change) | |
682 | nb8800_mac_config(dev); | |
683 | ||
684 | nb8800_pause_config(dev); | |
685 | } | |
686 | ||
687 | if (phydev->link != priv->link) { | |
688 | priv->link = phydev->link; | |
689 | change = 1; | |
690 | } | |
691 | ||
692 | if (change) | |
693 | phy_print_status(priv->phydev); | |
694 | } | |
695 | ||
696 | static void nb8800_update_mac_addr(struct net_device *dev) | |
697 | { | |
698 | struct nb8800_priv *priv = netdev_priv(dev); | |
699 | int i; | |
700 | ||
701 | for (i = 0; i < ETH_ALEN; i++) | |
702 | nb8800_writeb(priv, NB8800_SRC_ADDR(i), dev->dev_addr[i]); | |
703 | ||
704 | for (i = 0; i < ETH_ALEN; i++) | |
705 | nb8800_writeb(priv, NB8800_UC_ADDR(i), dev->dev_addr[i]); | |
706 | } | |
707 | ||
708 | static int nb8800_set_mac_address(struct net_device *dev, void *addr) | |
709 | { | |
710 | struct sockaddr *sock = addr; | |
711 | ||
712 | if (netif_running(dev)) | |
713 | return -EBUSY; | |
714 | ||
715 | ether_addr_copy(dev->dev_addr, sock->sa_data); | |
716 | nb8800_update_mac_addr(dev); | |
717 | ||
718 | return 0; | |
719 | } | |
720 | ||
721 | static void nb8800_mc_init(struct net_device *dev, int val) | |
722 | { | |
723 | struct nb8800_priv *priv = netdev_priv(dev); | |
724 | ||
725 | nb8800_writeb(priv, NB8800_MC_INIT, val); | |
726 | readb_poll_timeout_atomic(priv->base + NB8800_MC_INIT, val, !val, | |
727 | 1, 1000); | |
728 | } | |
729 | ||
730 | static void nb8800_set_rx_mode(struct net_device *dev) | |
731 | { | |
732 | struct nb8800_priv *priv = netdev_priv(dev); | |
733 | struct netdev_hw_addr *ha; | |
734 | int i; | |
735 | ||
736 | if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { | |
737 | nb8800_mac_af(dev, false); | |
738 | return; | |
739 | } | |
740 | ||
741 | nb8800_mac_af(dev, true); | |
742 | nb8800_mc_init(dev, 0); | |
743 | ||
744 | netdev_for_each_mc_addr(ha, dev) { | |
745 | for (i = 0; i < ETH_ALEN; i++) | |
746 | nb8800_writeb(priv, NB8800_MC_ADDR(i), ha->addr[i]); | |
747 | ||
748 | nb8800_mc_init(dev, 0xff); | |
749 | } | |
750 | } | |
751 | ||
752 | #define RX_DESC_SIZE (RX_DESC_COUNT * sizeof(struct nb8800_rx_desc)) | |
753 | #define TX_DESC_SIZE (TX_DESC_COUNT * sizeof(struct nb8800_tx_desc)) | |
754 | ||
755 | static void nb8800_dma_free(struct net_device *dev) | |
756 | { | |
757 | struct nb8800_priv *priv = netdev_priv(dev); | |
758 | unsigned int i; | |
759 | ||
760 | if (priv->rx_bufs) { | |
761 | for (i = 0; i < RX_DESC_COUNT; i++) | |
762 | if (priv->rx_bufs[i].page) | |
763 | put_page(priv->rx_bufs[i].page); | |
764 | ||
765 | kfree(priv->rx_bufs); | |
766 | priv->rx_bufs = NULL; | |
767 | } | |
768 | ||
769 | if (priv->tx_bufs) { | |
770 | for (i = 0; i < TX_DESC_COUNT; i++) | |
771 | kfree_skb(priv->tx_bufs[i].skb); | |
772 | ||
773 | kfree(priv->tx_bufs); | |
774 | priv->tx_bufs = NULL; | |
775 | } | |
776 | ||
777 | if (priv->rx_descs) { | |
778 | dma_free_coherent(dev->dev.parent, RX_DESC_SIZE, priv->rx_descs, | |
779 | priv->rx_desc_dma); | |
780 | priv->rx_descs = NULL; | |
781 | } | |
782 | ||
783 | if (priv->tx_descs) { | |
784 | dma_free_coherent(dev->dev.parent, TX_DESC_SIZE, priv->tx_descs, | |
785 | priv->tx_desc_dma); | |
786 | priv->tx_descs = NULL; | |
787 | } | |
788 | } | |
789 | ||
790 | static void nb8800_dma_reset(struct net_device *dev) | |
791 | { | |
792 | struct nb8800_priv *priv = netdev_priv(dev); | |
793 | struct nb8800_rx_desc *rxd; | |
794 | struct nb8800_tx_desc *txd; | |
795 | unsigned int i; | |
796 | ||
797 | for (i = 0; i < RX_DESC_COUNT; i++) { | |
798 | dma_addr_t rx_dma = priv->rx_desc_dma + i * sizeof(*rxd); | |
799 | ||
800 | rxd = &priv->rx_descs[i]; | |
801 | rxd->desc.n_addr = rx_dma + sizeof(*rxd); | |
802 | rxd->desc.r_addr = | |
803 | rx_dma + offsetof(struct nb8800_rx_desc, report); | |
804 | rxd->desc.config = priv->rx_dma_config; | |
805 | rxd->report = 0; | |
806 | } | |
807 | ||
808 | rxd->desc.n_addr = priv->rx_desc_dma; | |
809 | rxd->desc.config |= DESC_EOC; | |
810 | ||
811 | priv->rx_eoc = RX_DESC_COUNT - 1; | |
812 | ||
813 | for (i = 0; i < TX_DESC_COUNT; i++) { | |
814 | struct nb8800_tx_buf *txb = &priv->tx_bufs[i]; | |
815 | dma_addr_t r_dma = txb->dma_desc + | |
816 | offsetof(struct nb8800_tx_desc, report); | |
817 | ||
818 | txd = &priv->tx_descs[i]; | |
819 | txd->desc[0].r_addr = r_dma; | |
820 | txd->desc[1].r_addr = r_dma; | |
821 | txd->report = 0; | |
822 | } | |
823 | ||
824 | priv->tx_next = 0; | |
825 | priv->tx_queue = 0; | |
826 | priv->tx_done = 0; | |
827 | atomic_set(&priv->tx_free, TX_DESC_COUNT); | |
828 | ||
829 | nb8800_writel(priv, NB8800_RX_DESC_ADDR, priv->rx_desc_dma); | |
830 | ||
831 | wmb(); /* ensure all setup is written before starting */ | |
832 | } | |
833 | ||
834 | static int nb8800_dma_init(struct net_device *dev) | |
835 | { | |
836 | struct nb8800_priv *priv = netdev_priv(dev); | |
837 | unsigned int n_rx = RX_DESC_COUNT; | |
838 | unsigned int n_tx = TX_DESC_COUNT; | |
839 | unsigned int i; | |
840 | int err; | |
841 | ||
842 | priv->rx_descs = dma_alloc_coherent(dev->dev.parent, RX_DESC_SIZE, | |
843 | &priv->rx_desc_dma, GFP_KERNEL); | |
844 | if (!priv->rx_descs) | |
845 | goto err_out; | |
846 | ||
847 | priv->rx_bufs = kcalloc(n_rx, sizeof(*priv->rx_bufs), GFP_KERNEL); | |
848 | if (!priv->rx_bufs) | |
849 | goto err_out; | |
850 | ||
851 | for (i = 0; i < n_rx; i++) { | |
852 | err = nb8800_alloc_rx(dev, i, false); | |
853 | if (err) | |
854 | goto err_out; | |
855 | } | |
856 | ||
857 | priv->tx_descs = dma_alloc_coherent(dev->dev.parent, TX_DESC_SIZE, | |
858 | &priv->tx_desc_dma, GFP_KERNEL); | |
859 | if (!priv->tx_descs) | |
860 | goto err_out; | |
861 | ||
862 | priv->tx_bufs = kcalloc(n_tx, sizeof(*priv->tx_bufs), GFP_KERNEL); | |
863 | if (!priv->tx_bufs) | |
864 | goto err_out; | |
865 | ||
866 | for (i = 0; i < n_tx; i++) | |
867 | priv->tx_bufs[i].dma_desc = | |
868 | priv->tx_desc_dma + i * sizeof(struct nb8800_tx_desc); | |
869 | ||
870 | nb8800_dma_reset(dev); | |
871 | ||
872 | return 0; | |
873 | ||
874 | err_out: | |
875 | nb8800_dma_free(dev); | |
876 | ||
877 | return -ENOMEM; | |
878 | } | |
879 | ||
880 | static int nb8800_dma_stop(struct net_device *dev) | |
881 | { | |
882 | struct nb8800_priv *priv = netdev_priv(dev); | |
883 | struct nb8800_tx_buf *txb = &priv->tx_bufs[0]; | |
884 | struct nb8800_tx_desc *txd = &priv->tx_descs[0]; | |
885 | int retry = 5; | |
886 | u32 txcr; | |
887 | u32 rxcr; | |
888 | int err; | |
889 | unsigned int i; | |
890 | ||
891 | /* wait for tx to finish */ | |
892 | err = readl_poll_timeout_atomic(priv->base + NB8800_TXC_CR, txcr, | |
893 | !(txcr & TCR_EN) && | |
894 | priv->tx_done == priv->tx_next, | |
895 | 1000, 1000000); | |
896 | if (err) | |
897 | return err; | |
898 | ||
899 | /* The rx DMA only stops if it reaches the end of chain. | |
900 | * To make this happen, we set the EOC flag on all rx | |
901 | * descriptors, put the device in loopback mode, and send | |
902 | * a few dummy frames. The interrupt handler will ignore | |
903 | * these since NAPI is disabled and no real frames are in | |
904 | * the tx queue. | |
905 | */ | |
906 | ||
907 | for (i = 0; i < RX_DESC_COUNT; i++) | |
908 | priv->rx_descs[i].desc.config |= DESC_EOC; | |
909 | ||
910 | txd->desc[0].s_addr = | |
911 | txb->dma_desc + offsetof(struct nb8800_tx_desc, buf); | |
912 | txd->desc[0].config = DESC_BTS(2) | DESC_DS | DESC_EOF | DESC_EOC | 8; | |
913 | memset(txd->buf, 0, sizeof(txd->buf)); | |
914 | ||
915 | nb8800_mac_af(dev, false); | |
916 | nb8800_setb(priv, NB8800_MAC_MODE, LOOPBACK_EN); | |
917 | ||
918 | do { | |
919 | nb8800_writel(priv, NB8800_TX_DESC_ADDR, txb->dma_desc); | |
920 | wmb(); | |
921 | nb8800_writel(priv, NB8800_TXC_CR, txcr | TCR_EN); | |
922 | ||
923 | err = readl_poll_timeout_atomic(priv->base + NB8800_RXC_CR, | |
924 | rxcr, !(rxcr & RCR_EN), | |
925 | 1000, 100000); | |
926 | } while (err && --retry); | |
927 | ||
928 | nb8800_mac_af(dev, true); | |
929 | nb8800_clearb(priv, NB8800_MAC_MODE, LOOPBACK_EN); | |
930 | nb8800_dma_reset(dev); | |
931 | ||
932 | return retry ? 0 : -ETIMEDOUT; | |
933 | } | |
934 | ||
935 | static void nb8800_pause_adv(struct net_device *dev) | |
936 | { | |
937 | struct nb8800_priv *priv = netdev_priv(dev); | |
938 | u32 adv = 0; | |
939 | ||
940 | if (!priv->phydev) | |
941 | return; | |
942 | ||
943 | if (priv->pause_rx) | |
944 | adv |= ADVERTISED_Pause | ADVERTISED_Asym_Pause; | |
945 | if (priv->pause_tx) | |
946 | adv ^= ADVERTISED_Asym_Pause; | |
947 | ||
948 | priv->phydev->supported |= adv; | |
949 | priv->phydev->advertising |= adv; | |
950 | } | |
951 | ||
952 | static int nb8800_open(struct net_device *dev) | |
953 | { | |
954 | struct nb8800_priv *priv = netdev_priv(dev); | |
955 | int err; | |
956 | ||
957 | /* clear any pending interrupts */ | |
958 | nb8800_writel(priv, NB8800_RXC_SR, 0xf); | |
959 | nb8800_writel(priv, NB8800_TXC_SR, 0xf); | |
960 | ||
961 | err = nb8800_dma_init(dev); | |
962 | if (err) | |
963 | return err; | |
964 | ||
965 | err = request_irq(dev->irq, nb8800_irq, 0, dev_name(&dev->dev), dev); | |
966 | if (err) | |
967 | goto err_free_dma; | |
968 | ||
969 | nb8800_mac_rx(dev, true); | |
970 | nb8800_mac_tx(dev, true); | |
971 | ||
972 | priv->phydev = of_phy_connect(dev, priv->phy_node, | |
973 | nb8800_link_reconfigure, 0, | |
974 | priv->phy_mode); | |
975 | if (!priv->phydev) | |
976 | goto err_free_irq; | |
977 | ||
978 | nb8800_pause_adv(dev); | |
979 | ||
980 | netdev_reset_queue(dev); | |
981 | napi_enable(&priv->napi); | |
982 | netif_start_queue(dev); | |
983 | ||
984 | nb8800_start_rx(dev); | |
985 | phy_start(priv->phydev); | |
986 | ||
987 | return 0; | |
988 | ||
989 | err_free_irq: | |
990 | free_irq(dev->irq, dev); | |
991 | err_free_dma: | |
992 | nb8800_dma_free(dev); | |
993 | ||
994 | return err; | |
995 | } | |
996 | ||
997 | static int nb8800_stop(struct net_device *dev) | |
998 | { | |
999 | struct nb8800_priv *priv = netdev_priv(dev); | |
1000 | ||
1001 | phy_stop(priv->phydev); | |
1002 | ||
1003 | netif_stop_queue(dev); | |
1004 | napi_disable(&priv->napi); | |
1005 | ||
1006 | nb8800_dma_stop(dev); | |
1007 | nb8800_mac_rx(dev, false); | |
1008 | nb8800_mac_tx(dev, false); | |
1009 | ||
1010 | phy_disconnect(priv->phydev); | |
1011 | priv->phydev = NULL; | |
1012 | ||
1013 | free_irq(dev->irq, dev); | |
1014 | ||
1015 | nb8800_dma_free(dev); | |
1016 | ||
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | static int nb8800_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) | |
1021 | { | |
1022 | struct nb8800_priv *priv = netdev_priv(dev); | |
1023 | ||
1024 | return phy_mii_ioctl(priv->phydev, rq, cmd); | |
1025 | } | |
1026 | ||
1027 | static const struct net_device_ops nb8800_netdev_ops = { | |
1028 | .ndo_open = nb8800_open, | |
1029 | .ndo_stop = nb8800_stop, | |
1030 | .ndo_start_xmit = nb8800_xmit, | |
1031 | .ndo_set_mac_address = nb8800_set_mac_address, | |
1032 | .ndo_set_rx_mode = nb8800_set_rx_mode, | |
1033 | .ndo_do_ioctl = nb8800_ioctl, | |
1034 | .ndo_change_mtu = eth_change_mtu, | |
1035 | .ndo_validate_addr = eth_validate_addr, | |
1036 | }; | |
1037 | ||
1038 | static int nb8800_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1039 | { | |
1040 | struct nb8800_priv *priv = netdev_priv(dev); | |
1041 | ||
1042 | if (!priv->phydev) | |
1043 | return -ENODEV; | |
1044 | ||
1045 | return phy_ethtool_gset(priv->phydev, cmd); | |
1046 | } | |
1047 | ||
1048 | static int nb8800_set_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1049 | { | |
1050 | struct nb8800_priv *priv = netdev_priv(dev); | |
1051 | ||
1052 | if (!priv->phydev) | |
1053 | return -ENODEV; | |
1054 | ||
1055 | return phy_ethtool_sset(priv->phydev, cmd); | |
1056 | } | |
1057 | ||
1058 | static int nb8800_nway_reset(struct net_device *dev) | |
1059 | { | |
1060 | struct nb8800_priv *priv = netdev_priv(dev); | |
1061 | ||
1062 | if (!priv->phydev) | |
1063 | return -ENODEV; | |
1064 | ||
1065 | return genphy_restart_aneg(priv->phydev); | |
1066 | } | |
1067 | ||
1068 | static void nb8800_get_pauseparam(struct net_device *dev, | |
1069 | struct ethtool_pauseparam *pp) | |
1070 | { | |
1071 | struct nb8800_priv *priv = netdev_priv(dev); | |
1072 | ||
1073 | pp->autoneg = priv->pause_aneg; | |
1074 | pp->rx_pause = priv->pause_rx; | |
1075 | pp->tx_pause = priv->pause_tx; | |
1076 | } | |
1077 | ||
1078 | static int nb8800_set_pauseparam(struct net_device *dev, | |
1079 | struct ethtool_pauseparam *pp) | |
1080 | { | |
1081 | struct nb8800_priv *priv = netdev_priv(dev); | |
1082 | ||
1083 | priv->pause_aneg = pp->autoneg; | |
1084 | priv->pause_rx = pp->rx_pause; | |
1085 | priv->pause_tx = pp->tx_pause; | |
1086 | ||
1087 | nb8800_pause_adv(dev); | |
1088 | ||
1089 | if (!priv->pause_aneg) | |
1090 | nb8800_pause_config(dev); | |
1091 | else if (priv->phydev) | |
1092 | phy_start_aneg(priv->phydev); | |
1093 | ||
1094 | return 0; | |
1095 | } | |
1096 | ||
1097 | static const char nb8800_stats_names[][ETH_GSTRING_LEN] = { | |
1098 | "rx_bytes_ok", | |
1099 | "rx_frames_ok", | |
1100 | "rx_undersize_frames", | |
1101 | "rx_fragment_frames", | |
1102 | "rx_64_byte_frames", | |
1103 | "rx_127_byte_frames", | |
1104 | "rx_255_byte_frames", | |
1105 | "rx_511_byte_frames", | |
1106 | "rx_1023_byte_frames", | |
1107 | "rx_max_size_frames", | |
1108 | "rx_oversize_frames", | |
1109 | "rx_bad_fcs_frames", | |
1110 | "rx_broadcast_frames", | |
1111 | "rx_multicast_frames", | |
1112 | "rx_control_frames", | |
1113 | "rx_pause_frames", | |
1114 | "rx_unsup_control_frames", | |
1115 | "rx_align_error_frames", | |
1116 | "rx_overrun_frames", | |
1117 | "rx_jabber_frames", | |
1118 | "rx_bytes", | |
1119 | "rx_frames", | |
1120 | ||
1121 | "tx_bytes_ok", | |
1122 | "tx_frames_ok", | |
1123 | "tx_64_byte_frames", | |
1124 | "tx_127_byte_frames", | |
1125 | "tx_255_byte_frames", | |
1126 | "tx_511_byte_frames", | |
1127 | "tx_1023_byte_frames", | |
1128 | "tx_max_size_frames", | |
1129 | "tx_oversize_frames", | |
1130 | "tx_broadcast_frames", | |
1131 | "tx_multicast_frames", | |
1132 | "tx_control_frames", | |
1133 | "tx_pause_frames", | |
1134 | "tx_underrun_frames", | |
1135 | "tx_single_collision_frames", | |
1136 | "tx_multi_collision_frames", | |
1137 | "tx_deferred_collision_frames", | |
1138 | "tx_late_collision_frames", | |
1139 | "tx_excessive_collision_frames", | |
1140 | "tx_bytes", | |
1141 | "tx_frames", | |
1142 | "tx_collisions", | |
1143 | }; | |
1144 | ||
1145 | #define NB8800_NUM_STATS ARRAY_SIZE(nb8800_stats_names) | |
1146 | ||
1147 | static int nb8800_get_sset_count(struct net_device *dev, int sset) | |
1148 | { | |
1149 | if (sset == ETH_SS_STATS) | |
1150 | return NB8800_NUM_STATS; | |
1151 | ||
1152 | return -EOPNOTSUPP; | |
1153 | } | |
1154 | ||
1155 | static void nb8800_get_strings(struct net_device *dev, u32 sset, u8 *buf) | |
1156 | { | |
1157 | if (sset == ETH_SS_STATS) | |
1158 | memcpy(buf, &nb8800_stats_names, sizeof(nb8800_stats_names)); | |
1159 | } | |
1160 | ||
1161 | static u32 nb8800_read_stat(struct net_device *dev, int index) | |
1162 | { | |
1163 | struct nb8800_priv *priv = netdev_priv(dev); | |
1164 | ||
1165 | nb8800_writeb(priv, NB8800_STAT_INDEX, index); | |
1166 | ||
1167 | return nb8800_readl(priv, NB8800_STAT_DATA); | |
1168 | } | |
1169 | ||
1170 | static void nb8800_get_ethtool_stats(struct net_device *dev, | |
1171 | struct ethtool_stats *estats, u64 *st) | |
1172 | { | |
1173 | unsigned int i; | |
1174 | u32 rx, tx; | |
1175 | ||
1176 | for (i = 0; i < NB8800_NUM_STATS / 2; i++) { | |
1177 | rx = nb8800_read_stat(dev, i); | |
1178 | tx = nb8800_read_stat(dev, i | 0x80); | |
1179 | st[i] = rx; | |
1180 | st[i + NB8800_NUM_STATS / 2] = tx; | |
1181 | } | |
1182 | } | |
1183 | ||
1184 | static const struct ethtool_ops nb8800_ethtool_ops = { | |
1185 | .get_settings = nb8800_get_settings, | |
1186 | .set_settings = nb8800_set_settings, | |
1187 | .nway_reset = nb8800_nway_reset, | |
1188 | .get_link = ethtool_op_get_link, | |
1189 | .get_pauseparam = nb8800_get_pauseparam, | |
1190 | .set_pauseparam = nb8800_set_pauseparam, | |
1191 | .get_sset_count = nb8800_get_sset_count, | |
1192 | .get_strings = nb8800_get_strings, | |
1193 | .get_ethtool_stats = nb8800_get_ethtool_stats, | |
1194 | }; | |
1195 | ||
1196 | static int nb8800_hw_init(struct net_device *dev) | |
1197 | { | |
1198 | struct nb8800_priv *priv = netdev_priv(dev); | |
1199 | u32 val; | |
1200 | ||
1201 | val = TX_RETRY_EN | TX_PAD_EN | TX_APPEND_FCS; | |
1202 | nb8800_writeb(priv, NB8800_TX_CTL1, val); | |
1203 | ||
1204 | /* Collision retry count */ | |
1205 | nb8800_writeb(priv, NB8800_TX_CTL2, 5); | |
1206 | ||
1207 | val = RX_PAD_STRIP | RX_AF_EN; | |
1208 | nb8800_writeb(priv, NB8800_RX_CTL, val); | |
1209 | ||
1210 | /* Chosen by fair dice roll */ | |
1211 | nb8800_writeb(priv, NB8800_RANDOM_SEED, 4); | |
1212 | ||
1213 | /* TX cycles per deferral period */ | |
1214 | nb8800_writeb(priv, NB8800_TX_SDP, 12); | |
1215 | ||
1216 | /* The following three threshold values have been | |
1217 | * experimentally determined for good results. | |
1218 | */ | |
1219 | ||
1220 | /* RX/TX FIFO threshold for partial empty (64-bit entries) */ | |
1221 | nb8800_writeb(priv, NB8800_PE_THRESHOLD, 0); | |
1222 | ||
1223 | /* RX/TX FIFO threshold for partial full (64-bit entries) */ | |
1224 | nb8800_writeb(priv, NB8800_PF_THRESHOLD, 255); | |
1225 | ||
1226 | /* Buffer size for transmit (64-bit entries) */ | |
1227 | nb8800_writeb(priv, NB8800_TX_BUFSIZE, 64); | |
1228 | ||
1229 | /* Configure tx DMA */ | |
1230 | ||
1231 | val = nb8800_readl(priv, NB8800_TXC_CR); | |
1232 | val &= TCR_LE; /* keep endian setting */ | |
1233 | val |= TCR_DM; /* DMA descriptor mode */ | |
1234 | val |= TCR_RS; /* automatically store tx status */ | |
1235 | val |= TCR_DIE; /* interrupt on DMA chain completion */ | |
1236 | val |= TCR_TFI(7); /* interrupt after 7 frames transmitted */ | |
1237 | val |= TCR_BTS(2); /* 32-byte bus transaction size */ | |
1238 | nb8800_writel(priv, NB8800_TXC_CR, val); | |
1239 | ||
1240 | /* TX complete interrupt after 10 ms or 7 frames (see above) */ | |
1241 | val = clk_get_rate(priv->clk) / 100; | |
1242 | nb8800_writel(priv, NB8800_TX_ITR, val); | |
1243 | ||
1244 | /* Configure rx DMA */ | |
1245 | ||
1246 | val = nb8800_readl(priv, NB8800_RXC_CR); | |
1247 | val &= RCR_LE; /* keep endian setting */ | |
1248 | val |= RCR_DM; /* DMA descriptor mode */ | |
1249 | val |= RCR_RS; /* automatically store rx status */ | |
1250 | val |= RCR_DIE; /* interrupt at end of DMA chain */ | |
1251 | val |= RCR_RFI(7); /* interrupt after 7 frames received */ | |
1252 | val |= RCR_BTS(2); /* 32-byte bus transaction size */ | |
1253 | nb8800_writel(priv, NB8800_RXC_CR, val); | |
1254 | ||
1255 | /* The rx interrupt can fire before the DMA has completed | |
1256 | * unless a small delay is added. 50 us is hopefully enough. | |
1257 | */ | |
1258 | priv->rx_itr_irq = clk_get_rate(priv->clk) / 20000; | |
1259 | ||
1260 | /* In NAPI poll mode we want to disable interrupts, but the | |
1261 | * hardware does not permit this. Delay 10 ms instead. | |
1262 | */ | |
1263 | priv->rx_itr_poll = clk_get_rate(priv->clk) / 100; | |
1264 | ||
1265 | nb8800_writel(priv, NB8800_RX_ITR, priv->rx_itr_irq); | |
1266 | ||
1267 | priv->rx_dma_config = RX_BUF_SIZE | DESC_BTS(2) | DESC_DS | DESC_EOF; | |
1268 | ||
1269 | /* Flow control settings */ | |
1270 | ||
1271 | /* Pause time of 0.1 ms */ | |
1272 | val = 100000 / 512; | |
1273 | nb8800_writeb(priv, NB8800_PQ1, val >> 8); | |
1274 | nb8800_writeb(priv, NB8800_PQ2, val & 0xff); | |
1275 | ||
1276 | /* Auto-negotiate by default */ | |
1277 | priv->pause_aneg = true; | |
1278 | priv->pause_rx = true; | |
1279 | priv->pause_tx = true; | |
1280 | ||
1281 | nb8800_mc_init(dev, 0); | |
1282 | ||
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | static int nb8800_tangox_init(struct net_device *dev) | |
1287 | { | |
1288 | struct nb8800_priv *priv = netdev_priv(dev); | |
1289 | u32 pad_mode = PAD_MODE_MII; | |
1290 | ||
1291 | switch (priv->phy_mode) { | |
1292 | case PHY_INTERFACE_MODE_MII: | |
1293 | case PHY_INTERFACE_MODE_GMII: | |
1294 | pad_mode = PAD_MODE_MII; | |
1295 | break; | |
1296 | ||
1297 | case PHY_INTERFACE_MODE_RGMII: | |
1298 | pad_mode = PAD_MODE_RGMII; | |
1299 | break; | |
1300 | ||
1301 | case PHY_INTERFACE_MODE_RGMII_TXID: | |
1302 | pad_mode = PAD_MODE_RGMII | PAD_MODE_GTX_CLK_DELAY; | |
1303 | break; | |
1304 | ||
1305 | default: | |
1306 | dev_err(dev->dev.parent, "unsupported phy mode %s\n", | |
1307 | phy_modes(priv->phy_mode)); | |
1308 | return -EINVAL; | |
1309 | } | |
1310 | ||
1311 | nb8800_writeb(priv, NB8800_TANGOX_PAD_MODE, pad_mode); | |
1312 | ||
1313 | return 0; | |
1314 | } | |
1315 | ||
1316 | static int nb8800_tangox_reset(struct net_device *dev) | |
1317 | { | |
1318 | struct nb8800_priv *priv = netdev_priv(dev); | |
1319 | int clk_div; | |
1320 | ||
1321 | nb8800_writeb(priv, NB8800_TANGOX_RESET, 0); | |
1322 | usleep_range(1000, 10000); | |
1323 | nb8800_writeb(priv, NB8800_TANGOX_RESET, 1); | |
1324 | ||
1325 | wmb(); /* ensure reset is cleared before proceeding */ | |
1326 | ||
1327 | clk_div = DIV_ROUND_UP(clk_get_rate(priv->clk), 2 * MAX_MDC_CLOCK); | |
1328 | nb8800_writew(priv, NB8800_TANGOX_MDIO_CLKDIV, clk_div); | |
1329 | ||
1330 | return 0; | |
1331 | } | |
1332 | ||
1333 | static const struct nb8800_ops nb8800_tangox_ops = { | |
1334 | .init = nb8800_tangox_init, | |
1335 | .reset = nb8800_tangox_reset, | |
1336 | }; | |
1337 | ||
1338 | static int nb8800_tango4_init(struct net_device *dev) | |
1339 | { | |
1340 | struct nb8800_priv *priv = netdev_priv(dev); | |
1341 | int err; | |
1342 | ||
1343 | err = nb8800_tangox_init(dev); | |
1344 | if (err) | |
1345 | return err; | |
1346 | ||
1347 | /* On tango4 interrupt on DMA completion per frame works and gives | |
1348 | * better performance despite generating more rx interrupts. | |
1349 | */ | |
1350 | ||
1351 | /* Disable unnecessary interrupt on rx completion */ | |
1352 | nb8800_clearl(priv, NB8800_RXC_CR, RCR_RFI(7)); | |
1353 | ||
1354 | /* Request interrupt on descriptor DMA completion */ | |
1355 | priv->rx_dma_config |= DESC_ID; | |
1356 | ||
1357 | return 0; | |
1358 | } | |
1359 | ||
1360 | static const struct nb8800_ops nb8800_tango4_ops = { | |
1361 | .init = nb8800_tango4_init, | |
1362 | .reset = nb8800_tangox_reset, | |
1363 | }; | |
1364 | ||
1365 | static const struct of_device_id nb8800_dt_ids[] = { | |
1366 | { | |
1367 | .compatible = "aurora,nb8800", | |
1368 | }, | |
1369 | { | |
1370 | .compatible = "sigma,smp8642-ethernet", | |
1371 | .data = &nb8800_tangox_ops, | |
1372 | }, | |
1373 | { | |
1374 | .compatible = "sigma,smp8734-ethernet", | |
1375 | .data = &nb8800_tango4_ops, | |
1376 | }, | |
1377 | { } | |
1378 | }; | |
1379 | ||
1380 | static int nb8800_probe(struct platform_device *pdev) | |
1381 | { | |
1382 | const struct of_device_id *match; | |
1383 | const struct nb8800_ops *ops = NULL; | |
1384 | struct nb8800_priv *priv; | |
1385 | struct resource *res; | |
1386 | struct net_device *dev; | |
1387 | struct mii_bus *bus; | |
1388 | const unsigned char *mac; | |
1389 | void __iomem *base; | |
1390 | int irq; | |
1391 | int ret; | |
1392 | ||
1393 | match = of_match_device(nb8800_dt_ids, &pdev->dev); | |
1394 | if (match) | |
1395 | ops = match->data; | |
1396 | ||
1397 | irq = platform_get_irq(pdev, 0); | |
1398 | if (irq <= 0) { | |
1399 | dev_err(&pdev->dev, "No IRQ\n"); | |
1400 | return -EINVAL; | |
1401 | } | |
1402 | ||
1403 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1404 | base = devm_ioremap_resource(&pdev->dev, res); | |
1405 | if (IS_ERR(base)) | |
1406 | return PTR_ERR(base); | |
1407 | ||
1408 | dev_dbg(&pdev->dev, "AU-NB8800 Ethernet at %pa\n", &res->start); | |
1409 | ||
1410 | dev = alloc_etherdev(sizeof(*priv)); | |
1411 | if (!dev) | |
1412 | return -ENOMEM; | |
1413 | ||
1414 | platform_set_drvdata(pdev, dev); | |
1415 | SET_NETDEV_DEV(dev, &pdev->dev); | |
1416 | ||
1417 | priv = netdev_priv(dev); | |
1418 | priv->base = base; | |
1419 | ||
1420 | priv->phy_mode = of_get_phy_mode(pdev->dev.of_node); | |
1421 | if (priv->phy_mode < 0) | |
1422 | priv->phy_mode = PHY_INTERFACE_MODE_RGMII; | |
1423 | ||
1424 | priv->clk = devm_clk_get(&pdev->dev, NULL); | |
1425 | if (IS_ERR(priv->clk)) { | |
1426 | dev_err(&pdev->dev, "failed to get clock\n"); | |
1427 | ret = PTR_ERR(priv->clk); | |
1428 | goto err_free_dev; | |
1429 | } | |
1430 | ||
1431 | ret = clk_prepare_enable(priv->clk); | |
1432 | if (ret) | |
1433 | goto err_free_dev; | |
1434 | ||
1435 | spin_lock_init(&priv->tx_lock); | |
1436 | ||
1437 | if (ops && ops->reset) { | |
1438 | ret = ops->reset(dev); | |
1439 | if (ret) | |
1440 | goto err_free_dev; | |
1441 | } | |
1442 | ||
1443 | bus = devm_mdiobus_alloc(&pdev->dev); | |
1444 | if (!bus) { | |
1445 | ret = -ENOMEM; | |
1446 | goto err_disable_clk; | |
1447 | } | |
1448 | ||
1449 | bus->name = "nb8800-mii"; | |
1450 | bus->read = nb8800_mdio_read; | |
1451 | bus->write = nb8800_mdio_write; | |
1452 | bus->parent = &pdev->dev; | |
1453 | snprintf(bus->id, MII_BUS_ID_SIZE, "%lx.nb8800-mii", | |
1454 | (unsigned long)res->start); | |
1455 | bus->priv = priv; | |
1456 | ||
1457 | ret = of_mdiobus_register(bus, pdev->dev.of_node); | |
1458 | if (ret) { | |
1459 | dev_err(&pdev->dev, "failed to register MII bus\n"); | |
1460 | goto err_disable_clk; | |
1461 | } | |
1462 | ||
1463 | priv->phy_node = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0); | |
1464 | if (!priv->phy_node) { | |
1465 | dev_err(&pdev->dev, "no PHY specified\n"); | |
1466 | ret = -ENODEV; | |
1467 | goto err_free_bus; | |
1468 | } | |
1469 | ||
1470 | priv->mii_bus = bus; | |
1471 | ||
1472 | ret = nb8800_hw_init(dev); | |
1473 | if (ret) | |
1474 | goto err_free_bus; | |
1475 | ||
1476 | if (ops && ops->init) { | |
1477 | ret = ops->init(dev); | |
1478 | if (ret) | |
1479 | goto err_free_bus; | |
1480 | } | |
1481 | ||
1482 | dev->netdev_ops = &nb8800_netdev_ops; | |
1483 | dev->ethtool_ops = &nb8800_ethtool_ops; | |
1484 | dev->flags |= IFF_MULTICAST; | |
1485 | dev->irq = irq; | |
1486 | ||
1487 | mac = of_get_mac_address(pdev->dev.of_node); | |
1488 | if (mac) | |
1489 | ether_addr_copy(dev->dev_addr, mac); | |
1490 | ||
1491 | if (!is_valid_ether_addr(dev->dev_addr)) | |
1492 | eth_hw_addr_random(dev); | |
1493 | ||
1494 | nb8800_update_mac_addr(dev); | |
1495 | ||
1496 | netif_carrier_off(dev); | |
1497 | ||
1498 | ret = register_netdev(dev); | |
1499 | if (ret) { | |
1500 | netdev_err(dev, "failed to register netdev\n"); | |
1501 | goto err_free_dma; | |
1502 | } | |
1503 | ||
1504 | netif_napi_add(dev, &priv->napi, nb8800_poll, NAPI_POLL_WEIGHT); | |
1505 | ||
1506 | netdev_info(dev, "MAC address %pM\n", dev->dev_addr); | |
1507 | ||
1508 | return 0; | |
1509 | ||
1510 | err_free_dma: | |
1511 | nb8800_dma_free(dev); | |
1512 | err_free_bus: | |
1513 | mdiobus_unregister(bus); | |
1514 | err_disable_clk: | |
1515 | clk_disable_unprepare(priv->clk); | |
1516 | err_free_dev: | |
1517 | free_netdev(dev); | |
1518 | ||
1519 | return ret; | |
1520 | } | |
1521 | ||
1522 | static int nb8800_remove(struct platform_device *pdev) | |
1523 | { | |
1524 | struct net_device *ndev = platform_get_drvdata(pdev); | |
1525 | struct nb8800_priv *priv = netdev_priv(ndev); | |
1526 | ||
1527 | unregister_netdev(ndev); | |
1528 | ||
1529 | mdiobus_unregister(priv->mii_bus); | |
1530 | ||
1531 | clk_disable_unprepare(priv->clk); | |
1532 | ||
1533 | nb8800_dma_free(ndev); | |
1534 | free_netdev(ndev); | |
1535 | ||
1536 | return 0; | |
1537 | } | |
1538 | ||
1539 | static struct platform_driver nb8800_driver = { | |
1540 | .driver = { | |
1541 | .name = "nb8800", | |
1542 | .of_match_table = nb8800_dt_ids, | |
1543 | }, | |
1544 | .probe = nb8800_probe, | |
1545 | .remove = nb8800_remove, | |
1546 | }; | |
1547 | ||
1548 | module_platform_driver(nb8800_driver); | |
1549 | ||
1550 | MODULE_DESCRIPTION("Aurora AU-NB8800 Ethernet driver"); | |
1551 | MODULE_AUTHOR("Mans Rullgard <mans@mansr.com>"); | |
1552 | MODULE_LICENSE("GPL"); |