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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/drivers/net/ethernet/ethoc.c
4 *
5 * Copyright (C) 2007-2008 Avionic Design Development GmbH
6 * Copyright (C) 2008-2009 Avionic Design GmbH
7 *
8 * Written by Thierry Reding <thierry.reding@avionic-design.de>
9 */
10
11 #include <linux/dma-mapping.h>
12 #include <linux/etherdevice.h>
13 #include <linux/clk.h>
14 #include <linux/crc32.h>
15 #include <linux/interrupt.h>
16 #include <linux/io.h>
17 #include <linux/mii.h>
18 #include <linux/phy.h>
19 #include <linux/platform_device.h>
20 #include <linux/sched.h>
21 #include <linux/slab.h>
22 #include <linux/of.h>
23 #include <linux/of_net.h>
24 #include <linux/module.h>
25 #include <net/ethoc.h>
26
27 static int buffer_size = 0x8000; /* 32 KBytes */
28 module_param(buffer_size, int, 0);
29 MODULE_PARM_DESC(buffer_size, "DMA buffer allocation size");
30
31 /* register offsets */
32 #define MODER 0x00
33 #define INT_SOURCE 0x04
34 #define INT_MASK 0x08
35 #define IPGT 0x0c
36 #define IPGR1 0x10
37 #define IPGR2 0x14
38 #define PACKETLEN 0x18
39 #define COLLCONF 0x1c
40 #define TX_BD_NUM 0x20
41 #define CTRLMODER 0x24
42 #define MIIMODER 0x28
43 #define MIICOMMAND 0x2c
44 #define MIIADDRESS 0x30
45 #define MIITX_DATA 0x34
46 #define MIIRX_DATA 0x38
47 #define MIISTATUS 0x3c
48 #define MAC_ADDR0 0x40
49 #define MAC_ADDR1 0x44
50 #define ETH_HASH0 0x48
51 #define ETH_HASH1 0x4c
52 #define ETH_TXCTRL 0x50
53 #define ETH_END 0x54
54
55 /* mode register */
56 #define MODER_RXEN (1 << 0) /* receive enable */
57 #define MODER_TXEN (1 << 1) /* transmit enable */
58 #define MODER_NOPRE (1 << 2) /* no preamble */
59 #define MODER_BRO (1 << 3) /* broadcast address */
60 #define MODER_IAM (1 << 4) /* individual address mode */
61 #define MODER_PRO (1 << 5) /* promiscuous mode */
62 #define MODER_IFG (1 << 6) /* interframe gap for incoming frames */
63 #define MODER_LOOP (1 << 7) /* loopback */
64 #define MODER_NBO (1 << 8) /* no back-off */
65 #define MODER_EDE (1 << 9) /* excess defer enable */
66 #define MODER_FULLD (1 << 10) /* full duplex */
67 #define MODER_RESET (1 << 11) /* FIXME: reset (undocumented) */
68 #define MODER_DCRC (1 << 12) /* delayed CRC enable */
69 #define MODER_CRC (1 << 13) /* CRC enable */
70 #define MODER_HUGE (1 << 14) /* huge packets enable */
71 #define MODER_PAD (1 << 15) /* padding enabled */
72 #define MODER_RSM (1 << 16) /* receive small packets */
73
74 /* interrupt source and mask registers */
75 #define INT_MASK_TXF (1 << 0) /* transmit frame */
76 #define INT_MASK_TXE (1 << 1) /* transmit error */
77 #define INT_MASK_RXF (1 << 2) /* receive frame */
78 #define INT_MASK_RXE (1 << 3) /* receive error */
79 #define INT_MASK_BUSY (1 << 4)
80 #define INT_MASK_TXC (1 << 5) /* transmit control frame */
81 #define INT_MASK_RXC (1 << 6) /* receive control frame */
82
83 #define INT_MASK_TX (INT_MASK_TXF | INT_MASK_TXE)
84 #define INT_MASK_RX (INT_MASK_RXF | INT_MASK_RXE)
85
86 #define INT_MASK_ALL ( \
87 INT_MASK_TXF | INT_MASK_TXE | \
88 INT_MASK_RXF | INT_MASK_RXE | \
89 INT_MASK_TXC | INT_MASK_RXC | \
90 INT_MASK_BUSY \
91 )
92
93 /* packet length register */
94 #define PACKETLEN_MIN(min) (((min) & 0xffff) << 16)
95 #define PACKETLEN_MAX(max) (((max) & 0xffff) << 0)
96 #define PACKETLEN_MIN_MAX(min, max) (PACKETLEN_MIN(min) | \
97 PACKETLEN_MAX(max))
98
99 /* transmit buffer number register */
100 #define TX_BD_NUM_VAL(x) (((x) <= 0x80) ? (x) : 0x80)
101
102 /* control module mode register */
103 #define CTRLMODER_PASSALL (1 << 0) /* pass all receive frames */
104 #define CTRLMODER_RXFLOW (1 << 1) /* receive control flow */
105 #define CTRLMODER_TXFLOW (1 << 2) /* transmit control flow */
106
107 /* MII mode register */
108 #define MIIMODER_CLKDIV(x) ((x) & 0xfe) /* needs to be an even number */
109 #define MIIMODER_NOPRE (1 << 8) /* no preamble */
110
111 /* MII command register */
112 #define MIICOMMAND_SCAN (1 << 0) /* scan status */
113 #define MIICOMMAND_READ (1 << 1) /* read status */
114 #define MIICOMMAND_WRITE (1 << 2) /* write control data */
115
116 /* MII address register */
117 #define MIIADDRESS_FIAD(x) (((x) & 0x1f) << 0)
118 #define MIIADDRESS_RGAD(x) (((x) & 0x1f) << 8)
119 #define MIIADDRESS_ADDR(phy, reg) (MIIADDRESS_FIAD(phy) | \
120 MIIADDRESS_RGAD(reg))
121
122 /* MII transmit data register */
123 #define MIITX_DATA_VAL(x) ((x) & 0xffff)
124
125 /* MII receive data register */
126 #define MIIRX_DATA_VAL(x) ((x) & 0xffff)
127
128 /* MII status register */
129 #define MIISTATUS_LINKFAIL (1 << 0)
130 #define MIISTATUS_BUSY (1 << 1)
131 #define MIISTATUS_INVALID (1 << 2)
132
133 /* TX buffer descriptor */
134 #define TX_BD_CS (1 << 0) /* carrier sense lost */
135 #define TX_BD_DF (1 << 1) /* defer indication */
136 #define TX_BD_LC (1 << 2) /* late collision */
137 #define TX_BD_RL (1 << 3) /* retransmission limit */
138 #define TX_BD_RETRY_MASK (0x00f0)
139 #define TX_BD_RETRY(x) (((x) & 0x00f0) >> 4)
140 #define TX_BD_UR (1 << 8) /* transmitter underrun */
141 #define TX_BD_CRC (1 << 11) /* TX CRC enable */
142 #define TX_BD_PAD (1 << 12) /* pad enable for short packets */
143 #define TX_BD_WRAP (1 << 13)
144 #define TX_BD_IRQ (1 << 14) /* interrupt request enable */
145 #define TX_BD_READY (1 << 15) /* TX buffer ready */
146 #define TX_BD_LEN(x) (((x) & 0xffff) << 16)
147 #define TX_BD_LEN_MASK (0xffff << 16)
148
149 #define TX_BD_STATS (TX_BD_CS | TX_BD_DF | TX_BD_LC | \
150 TX_BD_RL | TX_BD_RETRY_MASK | TX_BD_UR)
151
152 /* RX buffer descriptor */
153 #define RX_BD_LC (1 << 0) /* late collision */
154 #define RX_BD_CRC (1 << 1) /* RX CRC error */
155 #define RX_BD_SF (1 << 2) /* short frame */
156 #define RX_BD_TL (1 << 3) /* too long */
157 #define RX_BD_DN (1 << 4) /* dribble nibble */
158 #define RX_BD_IS (1 << 5) /* invalid symbol */
159 #define RX_BD_OR (1 << 6) /* receiver overrun */
160 #define RX_BD_MISS (1 << 7)
161 #define RX_BD_CF (1 << 8) /* control frame */
162 #define RX_BD_WRAP (1 << 13)
163 #define RX_BD_IRQ (1 << 14) /* interrupt request enable */
164 #define RX_BD_EMPTY (1 << 15)
165 #define RX_BD_LEN(x) (((x) & 0xffff) << 16)
166
167 #define RX_BD_STATS (RX_BD_LC | RX_BD_CRC | RX_BD_SF | RX_BD_TL | \
168 RX_BD_DN | RX_BD_IS | RX_BD_OR | RX_BD_MISS)
169
170 #define ETHOC_BUFSIZ 1536
171 #define ETHOC_ZLEN 64
172 #define ETHOC_BD_BASE 0x400
173 #define ETHOC_TIMEOUT (HZ / 2)
174 #define ETHOC_MII_TIMEOUT (1 + (HZ / 5))
175
176 /**
177 * struct ethoc - driver-private device structure
178 * @iobase: pointer to I/O memory region
179 * @membase: pointer to buffer memory region
180 * @num_bd: number of buffer descriptors
181 * @num_tx: number of send buffers
182 * @cur_tx: last send buffer written
183 * @dty_tx: last buffer actually sent
184 * @num_rx: number of receive buffers
185 * @cur_rx: current receive buffer
186 * @vma: pointer to array of virtual memory addresses for buffers
187 * @netdev: pointer to network device structure
188 * @napi: NAPI structure
189 * @msg_enable: device state flags
190 * @lock: device lock
191 * @mdio: MDIO bus for PHY access
192 * @phy_id: address of attached PHY
193 */
194 struct ethoc {
195 void __iomem *iobase;
196 void __iomem *membase;
197 bool big_endian;
198
199 unsigned int num_bd;
200 unsigned int num_tx;
201 unsigned int cur_tx;
202 unsigned int dty_tx;
203
204 unsigned int num_rx;
205 unsigned int cur_rx;
206
207 void **vma;
208
209 struct net_device *netdev;
210 struct napi_struct napi;
211 u32 msg_enable;
212
213 spinlock_t lock;
214
215 struct mii_bus *mdio;
216 struct clk *clk;
217 s8 phy_id;
218
219 int old_link;
220 int old_duplex;
221 };
222
223 /**
224 * struct ethoc_bd - buffer descriptor
225 * @stat: buffer statistics
226 * @addr: physical memory address
227 */
228 struct ethoc_bd {
229 u32 stat;
230 u32 addr;
231 };
232
233 static inline u32 ethoc_read(struct ethoc *dev, loff_t offset)
234 {
235 if (dev->big_endian)
236 return ioread32be(dev->iobase + offset);
237 else
238 return ioread32(dev->iobase + offset);
239 }
240
241 static inline void ethoc_write(struct ethoc *dev, loff_t offset, u32 data)
242 {
243 if (dev->big_endian)
244 iowrite32be(data, dev->iobase + offset);
245 else
246 iowrite32(data, dev->iobase + offset);
247 }
248
249 static inline void ethoc_read_bd(struct ethoc *dev, int index,
250 struct ethoc_bd *bd)
251 {
252 loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd));
253 bd->stat = ethoc_read(dev, offset + 0);
254 bd->addr = ethoc_read(dev, offset + 4);
255 }
256
257 static inline void ethoc_write_bd(struct ethoc *dev, int index,
258 const struct ethoc_bd *bd)
259 {
260 loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd));
261 ethoc_write(dev, offset + 0, bd->stat);
262 ethoc_write(dev, offset + 4, bd->addr);
263 }
264
265 static inline void ethoc_enable_irq(struct ethoc *dev, u32 mask)
266 {
267 u32 imask = ethoc_read(dev, INT_MASK);
268 imask |= mask;
269 ethoc_write(dev, INT_MASK, imask);
270 }
271
272 static inline void ethoc_disable_irq(struct ethoc *dev, u32 mask)
273 {
274 u32 imask = ethoc_read(dev, INT_MASK);
275 imask &= ~mask;
276 ethoc_write(dev, INT_MASK, imask);
277 }
278
279 static inline void ethoc_ack_irq(struct ethoc *dev, u32 mask)
280 {
281 ethoc_write(dev, INT_SOURCE, mask);
282 }
283
284 static inline void ethoc_enable_rx_and_tx(struct ethoc *dev)
285 {
286 u32 mode = ethoc_read(dev, MODER);
287 mode |= MODER_RXEN | MODER_TXEN;
288 ethoc_write(dev, MODER, mode);
289 }
290
291 static inline void ethoc_disable_rx_and_tx(struct ethoc *dev)
292 {
293 u32 mode = ethoc_read(dev, MODER);
294 mode &= ~(MODER_RXEN | MODER_TXEN);
295 ethoc_write(dev, MODER, mode);
296 }
297
298 static int ethoc_init_ring(struct ethoc *dev, unsigned long mem_start)
299 {
300 struct ethoc_bd bd;
301 int i;
302 void *vma;
303
304 dev->cur_tx = 0;
305 dev->dty_tx = 0;
306 dev->cur_rx = 0;
307
308 ethoc_write(dev, TX_BD_NUM, dev->num_tx);
309
310 /* setup transmission buffers */
311 bd.addr = mem_start;
312 bd.stat = TX_BD_IRQ | TX_BD_CRC;
313 vma = dev->membase;
314
315 for (i = 0; i < dev->num_tx; i++) {
316 if (i == dev->num_tx - 1)
317 bd.stat |= TX_BD_WRAP;
318
319 ethoc_write_bd(dev, i, &bd);
320 bd.addr += ETHOC_BUFSIZ;
321
322 dev->vma[i] = vma;
323 vma += ETHOC_BUFSIZ;
324 }
325
326 bd.stat = RX_BD_EMPTY | RX_BD_IRQ;
327
328 for (i = 0; i < dev->num_rx; i++) {
329 if (i == dev->num_rx - 1)
330 bd.stat |= RX_BD_WRAP;
331
332 ethoc_write_bd(dev, dev->num_tx + i, &bd);
333 bd.addr += ETHOC_BUFSIZ;
334
335 dev->vma[dev->num_tx + i] = vma;
336 vma += ETHOC_BUFSIZ;
337 }
338
339 return 0;
340 }
341
342 static int ethoc_reset(struct ethoc *dev)
343 {
344 u32 mode;
345
346 /* TODO: reset controller? */
347
348 ethoc_disable_rx_and_tx(dev);
349
350 /* TODO: setup registers */
351
352 /* enable FCS generation and automatic padding */
353 mode = ethoc_read(dev, MODER);
354 mode |= MODER_CRC | MODER_PAD;
355 ethoc_write(dev, MODER, mode);
356
357 /* set full-duplex mode */
358 mode = ethoc_read(dev, MODER);
359 mode |= MODER_FULLD;
360 ethoc_write(dev, MODER, mode);
361 ethoc_write(dev, IPGT, 0x15);
362
363 ethoc_ack_irq(dev, INT_MASK_ALL);
364 ethoc_enable_irq(dev, INT_MASK_ALL);
365 ethoc_enable_rx_and_tx(dev);
366 return 0;
367 }
368
369 static unsigned int ethoc_update_rx_stats(struct ethoc *dev,
370 struct ethoc_bd *bd)
371 {
372 struct net_device *netdev = dev->netdev;
373 unsigned int ret = 0;
374
375 if (bd->stat & RX_BD_TL) {
376 dev_err(&netdev->dev, "RX: frame too long\n");
377 netdev->stats.rx_length_errors++;
378 ret++;
379 }
380
381 if (bd->stat & RX_BD_SF) {
382 dev_err(&netdev->dev, "RX: frame too short\n");
383 netdev->stats.rx_length_errors++;
384 ret++;
385 }
386
387 if (bd->stat & RX_BD_DN) {
388 dev_err(&netdev->dev, "RX: dribble nibble\n");
389 netdev->stats.rx_frame_errors++;
390 }
391
392 if (bd->stat & RX_BD_CRC) {
393 dev_err(&netdev->dev, "RX: wrong CRC\n");
394 netdev->stats.rx_crc_errors++;
395 ret++;
396 }
397
398 if (bd->stat & RX_BD_OR) {
399 dev_err(&netdev->dev, "RX: overrun\n");
400 netdev->stats.rx_over_errors++;
401 ret++;
402 }
403
404 if (bd->stat & RX_BD_MISS)
405 netdev->stats.rx_missed_errors++;
406
407 if (bd->stat & RX_BD_LC) {
408 dev_err(&netdev->dev, "RX: late collision\n");
409 netdev->stats.collisions++;
410 ret++;
411 }
412
413 return ret;
414 }
415
416 static int ethoc_rx(struct net_device *dev, int limit)
417 {
418 struct ethoc *priv = netdev_priv(dev);
419 int count;
420
421 for (count = 0; count < limit; ++count) {
422 unsigned int entry;
423 struct ethoc_bd bd;
424
425 entry = priv->num_tx + priv->cur_rx;
426 ethoc_read_bd(priv, entry, &bd);
427 if (bd.stat & RX_BD_EMPTY) {
428 ethoc_ack_irq(priv, INT_MASK_RX);
429 /* If packet (interrupt) came in between checking
430 * BD_EMTPY and clearing the interrupt source, then we
431 * risk missing the packet as the RX interrupt won't
432 * trigger right away when we reenable it; hence, check
433 * BD_EMTPY here again to make sure there isn't such a
434 * packet waiting for us...
435 */
436 ethoc_read_bd(priv, entry, &bd);
437 if (bd.stat & RX_BD_EMPTY)
438 break;
439 }
440
441 if (ethoc_update_rx_stats(priv, &bd) == 0) {
442 int size = bd.stat >> 16;
443 struct sk_buff *skb;
444
445 size -= 4; /* strip the CRC */
446 skb = netdev_alloc_skb_ip_align(dev, size);
447
448 if (likely(skb)) {
449 void *src = priv->vma[entry];
450 memcpy_fromio(skb_put(skb, size), src, size);
451 skb->protocol = eth_type_trans(skb, dev);
452 dev->stats.rx_packets++;
453 dev->stats.rx_bytes += size;
454 netif_receive_skb(skb);
455 } else {
456 if (net_ratelimit())
457 dev_warn(&dev->dev,
458 "low on memory - packet dropped\n");
459
460 dev->stats.rx_dropped++;
461 break;
462 }
463 }
464
465 /* clear the buffer descriptor so it can be reused */
466 bd.stat &= ~RX_BD_STATS;
467 bd.stat |= RX_BD_EMPTY;
468 ethoc_write_bd(priv, entry, &bd);
469 if (++priv->cur_rx == priv->num_rx)
470 priv->cur_rx = 0;
471 }
472
473 return count;
474 }
475
476 static void ethoc_update_tx_stats(struct ethoc *dev, struct ethoc_bd *bd)
477 {
478 struct net_device *netdev = dev->netdev;
479
480 if (bd->stat & TX_BD_LC) {
481 dev_err(&netdev->dev, "TX: late collision\n");
482 netdev->stats.tx_window_errors++;
483 }
484
485 if (bd->stat & TX_BD_RL) {
486 dev_err(&netdev->dev, "TX: retransmit limit\n");
487 netdev->stats.tx_aborted_errors++;
488 }
489
490 if (bd->stat & TX_BD_UR) {
491 dev_err(&netdev->dev, "TX: underrun\n");
492 netdev->stats.tx_fifo_errors++;
493 }
494
495 if (bd->stat & TX_BD_CS) {
496 dev_err(&netdev->dev, "TX: carrier sense lost\n");
497 netdev->stats.tx_carrier_errors++;
498 }
499
500 if (bd->stat & TX_BD_STATS)
501 netdev->stats.tx_errors++;
502
503 netdev->stats.collisions += (bd->stat >> 4) & 0xf;
504 netdev->stats.tx_bytes += bd->stat >> 16;
505 netdev->stats.tx_packets++;
506 }
507
508 static int ethoc_tx(struct net_device *dev, int limit)
509 {
510 struct ethoc *priv = netdev_priv(dev);
511 int count;
512 struct ethoc_bd bd;
513
514 for (count = 0; count < limit; ++count) {
515 unsigned int entry;
516
517 entry = priv->dty_tx & (priv->num_tx-1);
518
519 ethoc_read_bd(priv, entry, &bd);
520
521 if (bd.stat & TX_BD_READY || (priv->dty_tx == priv->cur_tx)) {
522 ethoc_ack_irq(priv, INT_MASK_TX);
523 /* If interrupt came in between reading in the BD
524 * and clearing the interrupt source, then we risk
525 * missing the event as the TX interrupt won't trigger
526 * right away when we reenable it; hence, check
527 * BD_EMPTY here again to make sure there isn't such an
528 * event pending...
529 */
530 ethoc_read_bd(priv, entry, &bd);
531 if (bd.stat & TX_BD_READY ||
532 (priv->dty_tx == priv->cur_tx))
533 break;
534 }
535
536 ethoc_update_tx_stats(priv, &bd);
537 priv->dty_tx++;
538 }
539
540 if ((priv->cur_tx - priv->dty_tx) <= (priv->num_tx / 2))
541 netif_wake_queue(dev);
542
543 return count;
544 }
545
546 static irqreturn_t ethoc_interrupt(int irq, void *dev_id)
547 {
548 struct net_device *dev = dev_id;
549 struct ethoc *priv = netdev_priv(dev);
550 u32 pending;
551 u32 mask;
552
553 /* Figure out what triggered the interrupt...
554 * The tricky bit here is that the interrupt source bits get
555 * set in INT_SOURCE for an event regardless of whether that
556 * event is masked or not. Thus, in order to figure out what
557 * triggered the interrupt, we need to remove the sources
558 * for all events that are currently masked. This behaviour
559 * is not particularly well documented but reasonable...
560 */
561 mask = ethoc_read(priv, INT_MASK);
562 pending = ethoc_read(priv, INT_SOURCE);
563 pending &= mask;
564
565 if (unlikely(pending == 0))
566 return IRQ_NONE;
567
568 ethoc_ack_irq(priv, pending);
569
570 /* We always handle the dropped packet interrupt */
571 if (pending & INT_MASK_BUSY) {
572 dev_dbg(&dev->dev, "packet dropped\n");
573 dev->stats.rx_dropped++;
574 }
575
576 /* Handle receive/transmit event by switching to polling */
577 if (pending & (INT_MASK_TX | INT_MASK_RX)) {
578 ethoc_disable_irq(priv, INT_MASK_TX | INT_MASK_RX);
579 napi_schedule(&priv->napi);
580 }
581
582 return IRQ_HANDLED;
583 }
584
585 static int ethoc_get_mac_address(struct net_device *dev, void *addr)
586 {
587 struct ethoc *priv = netdev_priv(dev);
588 u8 *mac = (u8 *)addr;
589 u32 reg;
590
591 reg = ethoc_read(priv, MAC_ADDR0);
592 mac[2] = (reg >> 24) & 0xff;
593 mac[3] = (reg >> 16) & 0xff;
594 mac[4] = (reg >> 8) & 0xff;
595 mac[5] = (reg >> 0) & 0xff;
596
597 reg = ethoc_read(priv, MAC_ADDR1);
598 mac[0] = (reg >> 8) & 0xff;
599 mac[1] = (reg >> 0) & 0xff;
600
601 return 0;
602 }
603
604 static int ethoc_poll(struct napi_struct *napi, int budget)
605 {
606 struct ethoc *priv = container_of(napi, struct ethoc, napi);
607 int rx_work_done = 0;
608 int tx_work_done = 0;
609
610 rx_work_done = ethoc_rx(priv->netdev, budget);
611 tx_work_done = ethoc_tx(priv->netdev, budget);
612
613 if (rx_work_done < budget && tx_work_done < budget) {
614 napi_complete_done(napi, rx_work_done);
615 ethoc_enable_irq(priv, INT_MASK_TX | INT_MASK_RX);
616 }
617
618 return rx_work_done;
619 }
620
621 static int ethoc_mdio_read(struct mii_bus *bus, int phy, int reg)
622 {
623 struct ethoc *priv = bus->priv;
624 int i;
625
626 ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg));
627 ethoc_write(priv, MIICOMMAND, MIICOMMAND_READ);
628
629 for (i = 0; i < 5; i++) {
630 u32 status = ethoc_read(priv, MIISTATUS);
631 if (!(status & MIISTATUS_BUSY)) {
632 u32 data = ethoc_read(priv, MIIRX_DATA);
633 /* reset MII command register */
634 ethoc_write(priv, MIICOMMAND, 0);
635 return data;
636 }
637 usleep_range(100, 200);
638 }
639
640 return -EBUSY;
641 }
642
643 static int ethoc_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
644 {
645 struct ethoc *priv = bus->priv;
646 int i;
647
648 ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg));
649 ethoc_write(priv, MIITX_DATA, val);
650 ethoc_write(priv, MIICOMMAND, MIICOMMAND_WRITE);
651
652 for (i = 0; i < 5; i++) {
653 u32 stat = ethoc_read(priv, MIISTATUS);
654 if (!(stat & MIISTATUS_BUSY)) {
655 /* reset MII command register */
656 ethoc_write(priv, MIICOMMAND, 0);
657 return 0;
658 }
659 usleep_range(100, 200);
660 }
661
662 return -EBUSY;
663 }
664
665 static void ethoc_mdio_poll(struct net_device *dev)
666 {
667 struct ethoc *priv = netdev_priv(dev);
668 struct phy_device *phydev = dev->phydev;
669 bool changed = false;
670 u32 mode;
671
672 if (priv->old_link != phydev->link) {
673 changed = true;
674 priv->old_link = phydev->link;
675 }
676
677 if (priv->old_duplex != phydev->duplex) {
678 changed = true;
679 priv->old_duplex = phydev->duplex;
680 }
681
682 if (!changed)
683 return;
684
685 mode = ethoc_read(priv, MODER);
686 if (phydev->duplex == DUPLEX_FULL)
687 mode |= MODER_FULLD;
688 else
689 mode &= ~MODER_FULLD;
690 ethoc_write(priv, MODER, mode);
691
692 phy_print_status(phydev);
693 }
694
695 static int ethoc_mdio_probe(struct net_device *dev)
696 {
697 struct ethoc *priv = netdev_priv(dev);
698 struct phy_device *phy;
699 int err;
700
701 if (priv->phy_id != -1)
702 phy = mdiobus_get_phy(priv->mdio, priv->phy_id);
703 else
704 phy = phy_find_first(priv->mdio);
705
706 if (!phy) {
707 dev_err(&dev->dev, "no PHY found\n");
708 return -ENXIO;
709 }
710
711 priv->old_duplex = -1;
712 priv->old_link = -1;
713
714 err = phy_connect_direct(dev, phy, ethoc_mdio_poll,
715 PHY_INTERFACE_MODE_GMII);
716 if (err) {
717 dev_err(&dev->dev, "could not attach to PHY\n");
718 return err;
719 }
720
721 phy_set_max_speed(phy, SPEED_100);
722
723 return 0;
724 }
725
726 static int ethoc_open(struct net_device *dev)
727 {
728 struct ethoc *priv = netdev_priv(dev);
729 int ret;
730
731 ret = request_irq(dev->irq, ethoc_interrupt, IRQF_SHARED,
732 dev->name, dev);
733 if (ret)
734 return ret;
735
736 napi_enable(&priv->napi);
737
738 ethoc_init_ring(priv, dev->mem_start);
739 ethoc_reset(priv);
740
741 if (netif_queue_stopped(dev)) {
742 dev_dbg(&dev->dev, " resuming queue\n");
743 netif_wake_queue(dev);
744 } else {
745 dev_dbg(&dev->dev, " starting queue\n");
746 netif_start_queue(dev);
747 }
748
749 priv->old_link = -1;
750 priv->old_duplex = -1;
751
752 phy_start(dev->phydev);
753
754 if (netif_msg_ifup(priv)) {
755 dev_info(&dev->dev, "I/O: %08lx Memory: %08lx-%08lx\n",
756 dev->base_addr, dev->mem_start, dev->mem_end);
757 }
758
759 return 0;
760 }
761
762 static int ethoc_stop(struct net_device *dev)
763 {
764 struct ethoc *priv = netdev_priv(dev);
765
766 napi_disable(&priv->napi);
767
768 if (dev->phydev)
769 phy_stop(dev->phydev);
770
771 ethoc_disable_rx_and_tx(priv);
772 free_irq(dev->irq, dev);
773
774 if (!netif_queue_stopped(dev))
775 netif_stop_queue(dev);
776
777 return 0;
778 }
779
780 static int ethoc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
781 {
782 struct ethoc *priv = netdev_priv(dev);
783 struct mii_ioctl_data *mdio = if_mii(ifr);
784 struct phy_device *phy = NULL;
785
786 if (!netif_running(dev))
787 return -EINVAL;
788
789 if (cmd != SIOCGMIIPHY) {
790 if (mdio->phy_id >= PHY_MAX_ADDR)
791 return -ERANGE;
792
793 phy = mdiobus_get_phy(priv->mdio, mdio->phy_id);
794 if (!phy)
795 return -ENODEV;
796 } else {
797 phy = dev->phydev;
798 }
799
800 return phy_mii_ioctl(phy, ifr, cmd);
801 }
802
803 static void ethoc_do_set_mac_address(struct net_device *dev)
804 {
805 struct ethoc *priv = netdev_priv(dev);
806 unsigned char *mac = dev->dev_addr;
807
808 ethoc_write(priv, MAC_ADDR0, (mac[2] << 24) | (mac[3] << 16) |
809 (mac[4] << 8) | (mac[5] << 0));
810 ethoc_write(priv, MAC_ADDR1, (mac[0] << 8) | (mac[1] << 0));
811 }
812
813 static int ethoc_set_mac_address(struct net_device *dev, void *p)
814 {
815 const struct sockaddr *addr = p;
816
817 if (!is_valid_ether_addr(addr->sa_data))
818 return -EADDRNOTAVAIL;
819 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
820 ethoc_do_set_mac_address(dev);
821 return 0;
822 }
823
824 static void ethoc_set_multicast_list(struct net_device *dev)
825 {
826 struct ethoc *priv = netdev_priv(dev);
827 u32 mode = ethoc_read(priv, MODER);
828 struct netdev_hw_addr *ha;
829 u32 hash[2] = { 0, 0 };
830
831 /* set loopback mode if requested */
832 if (dev->flags & IFF_LOOPBACK)
833 mode |= MODER_LOOP;
834 else
835 mode &= ~MODER_LOOP;
836
837 /* receive broadcast frames if requested */
838 if (dev->flags & IFF_BROADCAST)
839 mode &= ~MODER_BRO;
840 else
841 mode |= MODER_BRO;
842
843 /* enable promiscuous mode if requested */
844 if (dev->flags & IFF_PROMISC)
845 mode |= MODER_PRO;
846 else
847 mode &= ~MODER_PRO;
848
849 ethoc_write(priv, MODER, mode);
850
851 /* receive multicast frames */
852 if (dev->flags & IFF_ALLMULTI) {
853 hash[0] = 0xffffffff;
854 hash[1] = 0xffffffff;
855 } else {
856 netdev_for_each_mc_addr(ha, dev) {
857 u32 crc = ether_crc(ETH_ALEN, ha->addr);
858 int bit = (crc >> 26) & 0x3f;
859 hash[bit >> 5] |= 1 << (bit & 0x1f);
860 }
861 }
862
863 ethoc_write(priv, ETH_HASH0, hash[0]);
864 ethoc_write(priv, ETH_HASH1, hash[1]);
865 }
866
867 static int ethoc_change_mtu(struct net_device *dev, int new_mtu)
868 {
869 return -ENOSYS;
870 }
871
872 static void ethoc_tx_timeout(struct net_device *dev, unsigned int txqueue)
873 {
874 struct ethoc *priv = netdev_priv(dev);
875 u32 pending = ethoc_read(priv, INT_SOURCE);
876 if (likely(pending))
877 ethoc_interrupt(dev->irq, dev);
878 }
879
880 static netdev_tx_t ethoc_start_xmit(struct sk_buff *skb, struct net_device *dev)
881 {
882 struct ethoc *priv = netdev_priv(dev);
883 struct ethoc_bd bd;
884 unsigned int entry;
885 void *dest;
886
887 if (skb_put_padto(skb, ETHOC_ZLEN)) {
888 dev->stats.tx_errors++;
889 goto out_no_free;
890 }
891
892 if (unlikely(skb->len > ETHOC_BUFSIZ)) {
893 dev->stats.tx_errors++;
894 goto out;
895 }
896
897 entry = priv->cur_tx % priv->num_tx;
898 spin_lock_irq(&priv->lock);
899 priv->cur_tx++;
900
901 ethoc_read_bd(priv, entry, &bd);
902 if (unlikely(skb->len < ETHOC_ZLEN))
903 bd.stat |= TX_BD_PAD;
904 else
905 bd.stat &= ~TX_BD_PAD;
906
907 dest = priv->vma[entry];
908 memcpy_toio(dest, skb->data, skb->len);
909
910 bd.stat &= ~(TX_BD_STATS | TX_BD_LEN_MASK);
911 bd.stat |= TX_BD_LEN(skb->len);
912 ethoc_write_bd(priv, entry, &bd);
913
914 bd.stat |= TX_BD_READY;
915 ethoc_write_bd(priv, entry, &bd);
916
917 if (priv->cur_tx == (priv->dty_tx + priv->num_tx)) {
918 dev_dbg(&dev->dev, "stopping queue\n");
919 netif_stop_queue(dev);
920 }
921
922 spin_unlock_irq(&priv->lock);
923 skb_tx_timestamp(skb);
924 out:
925 dev_kfree_skb(skb);
926 out_no_free:
927 return NETDEV_TX_OK;
928 }
929
930 static int ethoc_get_regs_len(struct net_device *netdev)
931 {
932 return ETH_END;
933 }
934
935 static void ethoc_get_regs(struct net_device *dev, struct ethtool_regs *regs,
936 void *p)
937 {
938 struct ethoc *priv = netdev_priv(dev);
939 u32 *regs_buff = p;
940 unsigned i;
941
942 regs->version = 0;
943 for (i = 0; i < ETH_END / sizeof(u32); ++i)
944 regs_buff[i] = ethoc_read(priv, i * sizeof(u32));
945 }
946
947 static void ethoc_get_ringparam(struct net_device *dev,
948 struct ethtool_ringparam *ring)
949 {
950 struct ethoc *priv = netdev_priv(dev);
951
952 ring->rx_max_pending = priv->num_bd - 1;
953 ring->rx_mini_max_pending = 0;
954 ring->rx_jumbo_max_pending = 0;
955 ring->tx_max_pending = priv->num_bd - 1;
956
957 ring->rx_pending = priv->num_rx;
958 ring->rx_mini_pending = 0;
959 ring->rx_jumbo_pending = 0;
960 ring->tx_pending = priv->num_tx;
961 }
962
963 static int ethoc_set_ringparam(struct net_device *dev,
964 struct ethtool_ringparam *ring)
965 {
966 struct ethoc *priv = netdev_priv(dev);
967
968 if (ring->tx_pending < 1 || ring->rx_pending < 1 ||
969 ring->tx_pending + ring->rx_pending > priv->num_bd)
970 return -EINVAL;
971 if (ring->rx_mini_pending || ring->rx_jumbo_pending)
972 return -EINVAL;
973
974 if (netif_running(dev)) {
975 netif_tx_disable(dev);
976 ethoc_disable_rx_and_tx(priv);
977 ethoc_disable_irq(priv, INT_MASK_TX | INT_MASK_RX);
978 synchronize_irq(dev->irq);
979 }
980
981 priv->num_tx = rounddown_pow_of_two(ring->tx_pending);
982 priv->num_rx = ring->rx_pending;
983 ethoc_init_ring(priv, dev->mem_start);
984
985 if (netif_running(dev)) {
986 ethoc_enable_irq(priv, INT_MASK_TX | INT_MASK_RX);
987 ethoc_enable_rx_and_tx(priv);
988 netif_wake_queue(dev);
989 }
990 return 0;
991 }
992
993 static const struct ethtool_ops ethoc_ethtool_ops = {
994 .get_regs_len = ethoc_get_regs_len,
995 .get_regs = ethoc_get_regs,
996 .nway_reset = phy_ethtool_nway_reset,
997 .get_link = ethtool_op_get_link,
998 .get_ringparam = ethoc_get_ringparam,
999 .set_ringparam = ethoc_set_ringparam,
1000 .get_ts_info = ethtool_op_get_ts_info,
1001 .get_link_ksettings = phy_ethtool_get_link_ksettings,
1002 .set_link_ksettings = phy_ethtool_set_link_ksettings,
1003 };
1004
1005 static const struct net_device_ops ethoc_netdev_ops = {
1006 .ndo_open = ethoc_open,
1007 .ndo_stop = ethoc_stop,
1008 .ndo_do_ioctl = ethoc_ioctl,
1009 .ndo_set_mac_address = ethoc_set_mac_address,
1010 .ndo_set_rx_mode = ethoc_set_multicast_list,
1011 .ndo_change_mtu = ethoc_change_mtu,
1012 .ndo_tx_timeout = ethoc_tx_timeout,
1013 .ndo_start_xmit = ethoc_start_xmit,
1014 };
1015
1016 /**
1017 * ethoc_probe - initialize OpenCores ethernet MAC
1018 * pdev: platform device
1019 */
1020 static int ethoc_probe(struct platform_device *pdev)
1021 {
1022 struct net_device *netdev = NULL;
1023 struct resource *res = NULL;
1024 struct resource *mmio = NULL;
1025 struct resource *mem = NULL;
1026 struct ethoc *priv = NULL;
1027 int num_bd;
1028 int ret = 0;
1029 struct ethoc_platform_data *pdata = dev_get_platdata(&pdev->dev);
1030 u32 eth_clkfreq = pdata ? pdata->eth_clkfreq : 0;
1031
1032 /* allocate networking device */
1033 netdev = alloc_etherdev(sizeof(struct ethoc));
1034 if (!netdev) {
1035 ret = -ENOMEM;
1036 goto out;
1037 }
1038
1039 SET_NETDEV_DEV(netdev, &pdev->dev);
1040 platform_set_drvdata(pdev, netdev);
1041
1042 /* obtain I/O memory space */
1043 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1044 if (!res) {
1045 dev_err(&pdev->dev, "cannot obtain I/O memory space\n");
1046 ret = -ENXIO;
1047 goto free;
1048 }
1049
1050 mmio = devm_request_mem_region(&pdev->dev, res->start,
1051 resource_size(res), res->name);
1052 if (!mmio) {
1053 dev_err(&pdev->dev, "cannot request I/O memory space\n");
1054 ret = -ENXIO;
1055 goto free;
1056 }
1057
1058 netdev->base_addr = mmio->start;
1059
1060 /* obtain buffer memory space */
1061 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1062 if (res) {
1063 mem = devm_request_mem_region(&pdev->dev, res->start,
1064 resource_size(res), res->name);
1065 if (!mem) {
1066 dev_err(&pdev->dev, "cannot request memory space\n");
1067 ret = -ENXIO;
1068 goto free;
1069 }
1070
1071 netdev->mem_start = mem->start;
1072 netdev->mem_end = mem->end;
1073 }
1074
1075
1076 /* obtain device IRQ number */
1077 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1078 if (!res) {
1079 dev_err(&pdev->dev, "cannot obtain IRQ\n");
1080 ret = -ENXIO;
1081 goto free;
1082 }
1083
1084 netdev->irq = res->start;
1085
1086 /* setup driver-private data */
1087 priv = netdev_priv(netdev);
1088 priv->netdev = netdev;
1089
1090 priv->iobase = devm_ioremap(&pdev->dev, netdev->base_addr,
1091 resource_size(mmio));
1092 if (!priv->iobase) {
1093 dev_err(&pdev->dev, "cannot remap I/O memory space\n");
1094 ret = -ENXIO;
1095 goto free;
1096 }
1097
1098 if (netdev->mem_end) {
1099 priv->membase = devm_ioremap(&pdev->dev,
1100 netdev->mem_start, resource_size(mem));
1101 if (!priv->membase) {
1102 dev_err(&pdev->dev, "cannot remap memory space\n");
1103 ret = -ENXIO;
1104 goto free;
1105 }
1106 } else {
1107 /* Allocate buffer memory */
1108 priv->membase = dmam_alloc_coherent(&pdev->dev,
1109 buffer_size, (void *)&netdev->mem_start,
1110 GFP_KERNEL);
1111 if (!priv->membase) {
1112 dev_err(&pdev->dev, "cannot allocate %dB buffer\n",
1113 buffer_size);
1114 ret = -ENOMEM;
1115 goto free;
1116 }
1117 netdev->mem_end = netdev->mem_start + buffer_size;
1118 }
1119
1120 priv->big_endian = pdata ? pdata->big_endian :
1121 of_device_is_big_endian(pdev->dev.of_node);
1122
1123 /* calculate the number of TX/RX buffers, maximum 128 supported */
1124 num_bd = min_t(unsigned int,
1125 128, (netdev->mem_end - netdev->mem_start + 1) / ETHOC_BUFSIZ);
1126 if (num_bd < 4) {
1127 ret = -ENODEV;
1128 goto free;
1129 }
1130 priv->num_bd = num_bd;
1131 /* num_tx must be a power of two */
1132 priv->num_tx = rounddown_pow_of_two(num_bd >> 1);
1133 priv->num_rx = num_bd - priv->num_tx;
1134
1135 dev_dbg(&pdev->dev, "ethoc: num_tx: %d num_rx: %d\n",
1136 priv->num_tx, priv->num_rx);
1137
1138 priv->vma = devm_kcalloc(&pdev->dev, num_bd, sizeof(void *),
1139 GFP_KERNEL);
1140 if (!priv->vma) {
1141 ret = -ENOMEM;
1142 goto free;
1143 }
1144
1145 /* Allow the platform setup code to pass in a MAC address. */
1146 if (pdata) {
1147 ether_addr_copy(netdev->dev_addr, pdata->hwaddr);
1148 priv->phy_id = pdata->phy_id;
1149 } else {
1150 const void *mac;
1151
1152 mac = of_get_mac_address(pdev->dev.of_node);
1153 if (!IS_ERR(mac))
1154 ether_addr_copy(netdev->dev_addr, mac);
1155 priv->phy_id = -1;
1156 }
1157
1158 /* Check that the given MAC address is valid. If it isn't, read the
1159 * current MAC from the controller.
1160 */
1161 if (!is_valid_ether_addr(netdev->dev_addr))
1162 ethoc_get_mac_address(netdev, netdev->dev_addr);
1163
1164 /* Check the MAC again for validity, if it still isn't choose and
1165 * program a random one.
1166 */
1167 if (!is_valid_ether_addr(netdev->dev_addr))
1168 eth_hw_addr_random(netdev);
1169
1170 ethoc_do_set_mac_address(netdev);
1171
1172 /* Allow the platform setup code to adjust MII management bus clock. */
1173 if (!eth_clkfreq) {
1174 struct clk *clk = devm_clk_get(&pdev->dev, NULL);
1175
1176 if (!IS_ERR(clk)) {
1177 priv->clk = clk;
1178 clk_prepare_enable(clk);
1179 eth_clkfreq = clk_get_rate(clk);
1180 }
1181 }
1182 if (eth_clkfreq) {
1183 u32 clkdiv = MIIMODER_CLKDIV(eth_clkfreq / 2500000 + 1);
1184
1185 if (!clkdiv)
1186 clkdiv = 2;
1187 dev_dbg(&pdev->dev, "setting MII clkdiv to %u\n", clkdiv);
1188 ethoc_write(priv, MIIMODER,
1189 (ethoc_read(priv, MIIMODER) & MIIMODER_NOPRE) |
1190 clkdiv);
1191 }
1192
1193 /* register MII bus */
1194 priv->mdio = mdiobus_alloc();
1195 if (!priv->mdio) {
1196 ret = -ENOMEM;
1197 goto free2;
1198 }
1199
1200 priv->mdio->name = "ethoc-mdio";
1201 snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "%s-%d",
1202 priv->mdio->name, pdev->id);
1203 priv->mdio->read = ethoc_mdio_read;
1204 priv->mdio->write = ethoc_mdio_write;
1205 priv->mdio->priv = priv;
1206
1207 ret = mdiobus_register(priv->mdio);
1208 if (ret) {
1209 dev_err(&netdev->dev, "failed to register MDIO bus\n");
1210 goto free2;
1211 }
1212
1213 ret = ethoc_mdio_probe(netdev);
1214 if (ret) {
1215 dev_err(&netdev->dev, "failed to probe MDIO bus\n");
1216 goto error;
1217 }
1218
1219 /* setup the net_device structure */
1220 netdev->netdev_ops = &ethoc_netdev_ops;
1221 netdev->watchdog_timeo = ETHOC_TIMEOUT;
1222 netdev->features |= 0;
1223 netdev->ethtool_ops = &ethoc_ethtool_ops;
1224
1225 /* setup NAPI */
1226 netif_napi_add(netdev, &priv->napi, ethoc_poll, 64);
1227
1228 spin_lock_init(&priv->lock);
1229
1230 ret = register_netdev(netdev);
1231 if (ret < 0) {
1232 dev_err(&netdev->dev, "failed to register interface\n");
1233 goto error2;
1234 }
1235
1236 goto out;
1237
1238 error2:
1239 netif_napi_del(&priv->napi);
1240 error:
1241 mdiobus_unregister(priv->mdio);
1242 mdiobus_free(priv->mdio);
1243 free2:
1244 clk_disable_unprepare(priv->clk);
1245 free:
1246 free_netdev(netdev);
1247 out:
1248 return ret;
1249 }
1250
1251 /**
1252 * ethoc_remove - shutdown OpenCores ethernet MAC
1253 * @pdev: platform device
1254 */
1255 static int ethoc_remove(struct platform_device *pdev)
1256 {
1257 struct net_device *netdev = platform_get_drvdata(pdev);
1258 struct ethoc *priv = netdev_priv(netdev);
1259
1260 if (netdev) {
1261 netif_napi_del(&priv->napi);
1262 phy_disconnect(netdev->phydev);
1263
1264 if (priv->mdio) {
1265 mdiobus_unregister(priv->mdio);
1266 mdiobus_free(priv->mdio);
1267 }
1268 clk_disable_unprepare(priv->clk);
1269 unregister_netdev(netdev);
1270 free_netdev(netdev);
1271 }
1272
1273 return 0;
1274 }
1275
1276 #ifdef CONFIG_PM
1277 static int ethoc_suspend(struct platform_device *pdev, pm_message_t state)
1278 {
1279 return -ENOSYS;
1280 }
1281
1282 static int ethoc_resume(struct platform_device *pdev)
1283 {
1284 return -ENOSYS;
1285 }
1286 #else
1287 # define ethoc_suspend NULL
1288 # define ethoc_resume NULL
1289 #endif
1290
1291 static const struct of_device_id ethoc_match[] = {
1292 { .compatible = "opencores,ethoc", },
1293 {},
1294 };
1295 MODULE_DEVICE_TABLE(of, ethoc_match);
1296
1297 static struct platform_driver ethoc_driver = {
1298 .probe = ethoc_probe,
1299 .remove = ethoc_remove,
1300 .suspend = ethoc_suspend,
1301 .resume = ethoc_resume,
1302 .driver = {
1303 .name = "ethoc",
1304 .of_match_table = ethoc_match,
1305 },
1306 };
1307
1308 module_platform_driver(ethoc_driver);
1309
1310 MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
1311 MODULE_DESCRIPTION("OpenCores Ethernet MAC driver");
1312 MODULE_LICENSE("GPL v2");
1313
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