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Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[deliverable/linux.git] / drivers / net / ethernet / cadence / macb.c
1 /*
2 * Cadence MACB/GEM Ethernet Controller driver
3 *
4 * Copyright (C) 2004-2006 Atmel Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12 #include <linux/clk.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/circ_buf.h>
18 #include <linux/slab.h>
19 #include <linux/init.h>
20 #include <linux/io.h>
21 #include <linux/gpio.h>
22 #include <linux/gpio/consumer.h>
23 #include <linux/interrupt.h>
24 #include <linux/netdevice.h>
25 #include <linux/etherdevice.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/platform_data/macb.h>
28 #include <linux/platform_device.h>
29 #include <linux/phy.h>
30 #include <linux/of.h>
31 #include <linux/of_device.h>
32 #include <linux/of_gpio.h>
33 #include <linux/of_mdio.h>
34 #include <linux/of_net.h>
35
36 #include "macb.h"
37
38 #define MACB_RX_BUFFER_SIZE 128
39 #define RX_BUFFER_MULTIPLE 64 /* bytes */
40 #define RX_RING_SIZE 512 /* must be power of 2 */
41 #define RX_RING_BYTES (sizeof(struct macb_dma_desc) * RX_RING_SIZE)
42
43 #define TX_RING_SIZE 128 /* must be power of 2 */
44 #define TX_RING_BYTES (sizeof(struct macb_dma_desc) * TX_RING_SIZE)
45
46 /* level of occupied TX descriptors under which we wake up TX process */
47 #define MACB_TX_WAKEUP_THRESH (3 * TX_RING_SIZE / 4)
48
49 #define MACB_RX_INT_FLAGS (MACB_BIT(RCOMP) | MACB_BIT(RXUBR) \
50 | MACB_BIT(ISR_ROVR))
51 #define MACB_TX_ERR_FLAGS (MACB_BIT(ISR_TUND) \
52 | MACB_BIT(ISR_RLE) \
53 | MACB_BIT(TXERR))
54 #define MACB_TX_INT_FLAGS (MACB_TX_ERR_FLAGS | MACB_BIT(TCOMP))
55
56 #define MACB_MAX_TX_LEN ((unsigned int)((1 << MACB_TX_FRMLEN_SIZE) - 1))
57 #define GEM_MAX_TX_LEN ((unsigned int)((1 << GEM_TX_FRMLEN_SIZE) - 1))
58
59 #define GEM_MTU_MIN_SIZE 68
60
61 /*
62 * Graceful stop timeouts in us. We should allow up to
63 * 1 frame time (10 Mbits/s, full-duplex, ignoring collisions)
64 */
65 #define MACB_HALT_TIMEOUT 1230
66
67 /* Ring buffer accessors */
68 static unsigned int macb_tx_ring_wrap(unsigned int index)
69 {
70 return index & (TX_RING_SIZE - 1);
71 }
72
73 static struct macb_dma_desc *macb_tx_desc(struct macb_queue *queue,
74 unsigned int index)
75 {
76 return &queue->tx_ring[macb_tx_ring_wrap(index)];
77 }
78
79 static struct macb_tx_skb *macb_tx_skb(struct macb_queue *queue,
80 unsigned int index)
81 {
82 return &queue->tx_skb[macb_tx_ring_wrap(index)];
83 }
84
85 static dma_addr_t macb_tx_dma(struct macb_queue *queue, unsigned int index)
86 {
87 dma_addr_t offset;
88
89 offset = macb_tx_ring_wrap(index) * sizeof(struct macb_dma_desc);
90
91 return queue->tx_ring_dma + offset;
92 }
93
94 static unsigned int macb_rx_ring_wrap(unsigned int index)
95 {
96 return index & (RX_RING_SIZE - 1);
97 }
98
99 static struct macb_dma_desc *macb_rx_desc(struct macb *bp, unsigned int index)
100 {
101 return &bp->rx_ring[macb_rx_ring_wrap(index)];
102 }
103
104 static void *macb_rx_buffer(struct macb *bp, unsigned int index)
105 {
106 return bp->rx_buffers + bp->rx_buffer_size * macb_rx_ring_wrap(index);
107 }
108
109 /* I/O accessors */
110 static u32 hw_readl_native(struct macb *bp, int offset)
111 {
112 return __raw_readl(bp->regs + offset);
113 }
114
115 static void hw_writel_native(struct macb *bp, int offset, u32 value)
116 {
117 __raw_writel(value, bp->regs + offset);
118 }
119
120 static u32 hw_readl(struct macb *bp, int offset)
121 {
122 return readl_relaxed(bp->regs + offset);
123 }
124
125 static void hw_writel(struct macb *bp, int offset, u32 value)
126 {
127 writel_relaxed(value, bp->regs + offset);
128 }
129
130 /*
131 * Find the CPU endianness by using the loopback bit of NCR register. When the
132 * CPU is in big endian we need to program swaped mode for management
133 * descriptor access.
134 */
135 static bool hw_is_native_io(void __iomem *addr)
136 {
137 u32 value = MACB_BIT(LLB);
138
139 __raw_writel(value, addr + MACB_NCR);
140 value = __raw_readl(addr + MACB_NCR);
141
142 /* Write 0 back to disable everything */
143 __raw_writel(0, addr + MACB_NCR);
144
145 return value == MACB_BIT(LLB);
146 }
147
148 static bool hw_is_gem(void __iomem *addr, bool native_io)
149 {
150 u32 id;
151
152 if (native_io)
153 id = __raw_readl(addr + MACB_MID);
154 else
155 id = readl_relaxed(addr + MACB_MID);
156
157 return MACB_BFEXT(IDNUM, id) >= 0x2;
158 }
159
160 static void macb_set_hwaddr(struct macb *bp)
161 {
162 u32 bottom;
163 u16 top;
164
165 bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr));
166 macb_or_gem_writel(bp, SA1B, bottom);
167 top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4)));
168 macb_or_gem_writel(bp, SA1T, top);
169
170 /* Clear unused address register sets */
171 macb_or_gem_writel(bp, SA2B, 0);
172 macb_or_gem_writel(bp, SA2T, 0);
173 macb_or_gem_writel(bp, SA3B, 0);
174 macb_or_gem_writel(bp, SA3T, 0);
175 macb_or_gem_writel(bp, SA4B, 0);
176 macb_or_gem_writel(bp, SA4T, 0);
177 }
178
179 static void macb_get_hwaddr(struct macb *bp)
180 {
181 struct macb_platform_data *pdata;
182 u32 bottom;
183 u16 top;
184 u8 addr[6];
185 int i;
186
187 pdata = dev_get_platdata(&bp->pdev->dev);
188
189 /* Check all 4 address register for vaild address */
190 for (i = 0; i < 4; i++) {
191 bottom = macb_or_gem_readl(bp, SA1B + i * 8);
192 top = macb_or_gem_readl(bp, SA1T + i * 8);
193
194 if (pdata && pdata->rev_eth_addr) {
195 addr[5] = bottom & 0xff;
196 addr[4] = (bottom >> 8) & 0xff;
197 addr[3] = (bottom >> 16) & 0xff;
198 addr[2] = (bottom >> 24) & 0xff;
199 addr[1] = top & 0xff;
200 addr[0] = (top & 0xff00) >> 8;
201 } else {
202 addr[0] = bottom & 0xff;
203 addr[1] = (bottom >> 8) & 0xff;
204 addr[2] = (bottom >> 16) & 0xff;
205 addr[3] = (bottom >> 24) & 0xff;
206 addr[4] = top & 0xff;
207 addr[5] = (top >> 8) & 0xff;
208 }
209
210 if (is_valid_ether_addr(addr)) {
211 memcpy(bp->dev->dev_addr, addr, sizeof(addr));
212 return;
213 }
214 }
215
216 dev_info(&bp->pdev->dev, "invalid hw address, using random\n");
217 eth_hw_addr_random(bp->dev);
218 }
219
220 static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
221 {
222 struct macb *bp = bus->priv;
223 int value;
224
225 macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
226 | MACB_BF(RW, MACB_MAN_READ)
227 | MACB_BF(PHYA, mii_id)
228 | MACB_BF(REGA, regnum)
229 | MACB_BF(CODE, MACB_MAN_CODE)));
230
231 /* wait for end of transfer */
232 while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
233 cpu_relax();
234
235 value = MACB_BFEXT(DATA, macb_readl(bp, MAN));
236
237 return value;
238 }
239
240 static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
241 u16 value)
242 {
243 struct macb *bp = bus->priv;
244
245 macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
246 | MACB_BF(RW, MACB_MAN_WRITE)
247 | MACB_BF(PHYA, mii_id)
248 | MACB_BF(REGA, regnum)
249 | MACB_BF(CODE, MACB_MAN_CODE)
250 | MACB_BF(DATA, value)));
251
252 /* wait for end of transfer */
253 while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
254 cpu_relax();
255
256 return 0;
257 }
258
259 /**
260 * macb_set_tx_clk() - Set a clock to a new frequency
261 * @clk Pointer to the clock to change
262 * @rate New frequency in Hz
263 * @dev Pointer to the struct net_device
264 */
265 static void macb_set_tx_clk(struct clk *clk, int speed, struct net_device *dev)
266 {
267 long ferr, rate, rate_rounded;
268
269 if (!clk)
270 return;
271
272 switch (speed) {
273 case SPEED_10:
274 rate = 2500000;
275 break;
276 case SPEED_100:
277 rate = 25000000;
278 break;
279 case SPEED_1000:
280 rate = 125000000;
281 break;
282 default:
283 return;
284 }
285
286 rate_rounded = clk_round_rate(clk, rate);
287 if (rate_rounded < 0)
288 return;
289
290 /* RGMII allows 50 ppm frequency error. Test and warn if this limit
291 * is not satisfied.
292 */
293 ferr = abs(rate_rounded - rate);
294 ferr = DIV_ROUND_UP(ferr, rate / 100000);
295 if (ferr > 5)
296 netdev_warn(dev, "unable to generate target frequency: %ld Hz\n",
297 rate);
298
299 if (clk_set_rate(clk, rate_rounded))
300 netdev_err(dev, "adjusting tx_clk failed.\n");
301 }
302
303 static void macb_handle_link_change(struct net_device *dev)
304 {
305 struct macb *bp = netdev_priv(dev);
306 struct phy_device *phydev = bp->phy_dev;
307 unsigned long flags;
308 int status_change = 0;
309
310 spin_lock_irqsave(&bp->lock, flags);
311
312 if (phydev->link) {
313 if ((bp->speed != phydev->speed) ||
314 (bp->duplex != phydev->duplex)) {
315 u32 reg;
316
317 reg = macb_readl(bp, NCFGR);
318 reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
319 if (macb_is_gem(bp))
320 reg &= ~GEM_BIT(GBE);
321
322 if (phydev->duplex)
323 reg |= MACB_BIT(FD);
324 if (phydev->speed == SPEED_100)
325 reg |= MACB_BIT(SPD);
326 if (phydev->speed == SPEED_1000 &&
327 bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
328 reg |= GEM_BIT(GBE);
329
330 macb_or_gem_writel(bp, NCFGR, reg);
331
332 bp->speed = phydev->speed;
333 bp->duplex = phydev->duplex;
334 status_change = 1;
335 }
336 }
337
338 if (phydev->link != bp->link) {
339 if (!phydev->link) {
340 bp->speed = 0;
341 bp->duplex = -1;
342 }
343 bp->link = phydev->link;
344
345 status_change = 1;
346 }
347
348 spin_unlock_irqrestore(&bp->lock, flags);
349
350 if (status_change) {
351 if (phydev->link) {
352 /* Update the TX clock rate if and only if the link is
353 * up and there has been a link change.
354 */
355 macb_set_tx_clk(bp->tx_clk, phydev->speed, dev);
356
357 netif_carrier_on(dev);
358 netdev_info(dev, "link up (%d/%s)\n",
359 phydev->speed,
360 phydev->duplex == DUPLEX_FULL ?
361 "Full" : "Half");
362 } else {
363 netif_carrier_off(dev);
364 netdev_info(dev, "link down\n");
365 }
366 }
367 }
368
369 /* based on au1000_eth. c*/
370 static int macb_mii_probe(struct net_device *dev)
371 {
372 struct macb *bp = netdev_priv(dev);
373 struct macb_platform_data *pdata;
374 struct phy_device *phydev;
375 int phy_irq;
376 int ret;
377
378 phydev = phy_find_first(bp->mii_bus);
379 if (!phydev) {
380 netdev_err(dev, "no PHY found\n");
381 return -ENXIO;
382 }
383
384 pdata = dev_get_platdata(&bp->pdev->dev);
385 if (pdata && gpio_is_valid(pdata->phy_irq_pin)) {
386 ret = devm_gpio_request(&bp->pdev->dev, pdata->phy_irq_pin, "phy int");
387 if (!ret) {
388 phy_irq = gpio_to_irq(pdata->phy_irq_pin);
389 phydev->irq = (phy_irq < 0) ? PHY_POLL : phy_irq;
390 }
391 }
392
393 /* attach the mac to the phy */
394 ret = phy_connect_direct(dev, phydev, &macb_handle_link_change,
395 bp->phy_interface);
396 if (ret) {
397 netdev_err(dev, "Could not attach to PHY\n");
398 return ret;
399 }
400
401 /* mask with MAC supported features */
402 if (macb_is_gem(bp) && bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
403 phydev->supported &= PHY_GBIT_FEATURES;
404 else
405 phydev->supported &= PHY_BASIC_FEATURES;
406
407 if (bp->caps & MACB_CAPS_NO_GIGABIT_HALF)
408 phydev->supported &= ~SUPPORTED_1000baseT_Half;
409
410 phydev->advertising = phydev->supported;
411
412 bp->link = 0;
413 bp->speed = 0;
414 bp->duplex = -1;
415 bp->phy_dev = phydev;
416
417 return 0;
418 }
419
420 static int macb_mii_init(struct macb *bp)
421 {
422 struct macb_platform_data *pdata;
423 struct device_node *np;
424 int err = -ENXIO, i;
425
426 /* Enable management port */
427 macb_writel(bp, NCR, MACB_BIT(MPE));
428
429 bp->mii_bus = mdiobus_alloc();
430 if (bp->mii_bus == NULL) {
431 err = -ENOMEM;
432 goto err_out;
433 }
434
435 bp->mii_bus->name = "MACB_mii_bus";
436 bp->mii_bus->read = &macb_mdio_read;
437 bp->mii_bus->write = &macb_mdio_write;
438 snprintf(bp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
439 bp->pdev->name, bp->pdev->id);
440 bp->mii_bus->priv = bp;
441 bp->mii_bus->parent = &bp->dev->dev;
442 pdata = dev_get_platdata(&bp->pdev->dev);
443
444 dev_set_drvdata(&bp->dev->dev, bp->mii_bus);
445
446 np = bp->pdev->dev.of_node;
447 if (np) {
448 /* try dt phy registration */
449 err = of_mdiobus_register(bp->mii_bus, np);
450
451 /* fallback to standard phy registration if no phy were
452 found during dt phy registration */
453 if (!err && !phy_find_first(bp->mii_bus)) {
454 for (i = 0; i < PHY_MAX_ADDR; i++) {
455 struct phy_device *phydev;
456
457 phydev = mdiobus_scan(bp->mii_bus, i);
458 if (IS_ERR(phydev)) {
459 err = PTR_ERR(phydev);
460 break;
461 }
462 }
463
464 if (err)
465 goto err_out_unregister_bus;
466 }
467 } else {
468 if (pdata)
469 bp->mii_bus->phy_mask = pdata->phy_mask;
470
471 err = mdiobus_register(bp->mii_bus);
472 }
473
474 if (err)
475 goto err_out_free_mdiobus;
476
477 err = macb_mii_probe(bp->dev);
478 if (err)
479 goto err_out_unregister_bus;
480
481 return 0;
482
483 err_out_unregister_bus:
484 mdiobus_unregister(bp->mii_bus);
485 err_out_free_mdiobus:
486 mdiobus_free(bp->mii_bus);
487 err_out:
488 return err;
489 }
490
491 static void macb_update_stats(struct macb *bp)
492 {
493 u32 *p = &bp->hw_stats.macb.rx_pause_frames;
494 u32 *end = &bp->hw_stats.macb.tx_pause_frames + 1;
495 int offset = MACB_PFR;
496
497 WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4);
498
499 for(; p < end; p++, offset += 4)
500 *p += bp->macb_reg_readl(bp, offset);
501 }
502
503 static int macb_halt_tx(struct macb *bp)
504 {
505 unsigned long halt_time, timeout;
506 u32 status;
507
508 macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(THALT));
509
510 timeout = jiffies + usecs_to_jiffies(MACB_HALT_TIMEOUT);
511 do {
512 halt_time = jiffies;
513 status = macb_readl(bp, TSR);
514 if (!(status & MACB_BIT(TGO)))
515 return 0;
516
517 usleep_range(10, 250);
518 } while (time_before(halt_time, timeout));
519
520 return -ETIMEDOUT;
521 }
522
523 static void macb_tx_unmap(struct macb *bp, struct macb_tx_skb *tx_skb)
524 {
525 if (tx_skb->mapping) {
526 if (tx_skb->mapped_as_page)
527 dma_unmap_page(&bp->pdev->dev, tx_skb->mapping,
528 tx_skb->size, DMA_TO_DEVICE);
529 else
530 dma_unmap_single(&bp->pdev->dev, tx_skb->mapping,
531 tx_skb->size, DMA_TO_DEVICE);
532 tx_skb->mapping = 0;
533 }
534
535 if (tx_skb->skb) {
536 dev_kfree_skb_any(tx_skb->skb);
537 tx_skb->skb = NULL;
538 }
539 }
540
541 static void macb_tx_error_task(struct work_struct *work)
542 {
543 struct macb_queue *queue = container_of(work, struct macb_queue,
544 tx_error_task);
545 struct macb *bp = queue->bp;
546 struct macb_tx_skb *tx_skb;
547 struct macb_dma_desc *desc;
548 struct sk_buff *skb;
549 unsigned int tail;
550 unsigned long flags;
551
552 netdev_vdbg(bp->dev, "macb_tx_error_task: q = %u, t = %u, h = %u\n",
553 (unsigned int)(queue - bp->queues),
554 queue->tx_tail, queue->tx_head);
555
556 /* Prevent the queue IRQ handlers from running: each of them may call
557 * macb_tx_interrupt(), which in turn may call netif_wake_subqueue().
558 * As explained below, we have to halt the transmission before updating
559 * TBQP registers so we call netif_tx_stop_all_queues() to notify the
560 * network engine about the macb/gem being halted.
561 */
562 spin_lock_irqsave(&bp->lock, flags);
563
564 /* Make sure nobody is trying to queue up new packets */
565 netif_tx_stop_all_queues(bp->dev);
566
567 /*
568 * Stop transmission now
569 * (in case we have just queued new packets)
570 * macb/gem must be halted to write TBQP register
571 */
572 if (macb_halt_tx(bp))
573 /* Just complain for now, reinitializing TX path can be good */
574 netdev_err(bp->dev, "BUG: halt tx timed out\n");
575
576 /*
577 * Treat frames in TX queue including the ones that caused the error.
578 * Free transmit buffers in upper layer.
579 */
580 for (tail = queue->tx_tail; tail != queue->tx_head; tail++) {
581 u32 ctrl;
582
583 desc = macb_tx_desc(queue, tail);
584 ctrl = desc->ctrl;
585 tx_skb = macb_tx_skb(queue, tail);
586 skb = tx_skb->skb;
587
588 if (ctrl & MACB_BIT(TX_USED)) {
589 /* skb is set for the last buffer of the frame */
590 while (!skb) {
591 macb_tx_unmap(bp, tx_skb);
592 tail++;
593 tx_skb = macb_tx_skb(queue, tail);
594 skb = tx_skb->skb;
595 }
596
597 /* ctrl still refers to the first buffer descriptor
598 * since it's the only one written back by the hardware
599 */
600 if (!(ctrl & MACB_BIT(TX_BUF_EXHAUSTED))) {
601 netdev_vdbg(bp->dev, "txerr skb %u (data %p) TX complete\n",
602 macb_tx_ring_wrap(tail), skb->data);
603 bp->stats.tx_packets++;
604 bp->stats.tx_bytes += skb->len;
605 }
606 } else {
607 /*
608 * "Buffers exhausted mid-frame" errors may only happen
609 * if the driver is buggy, so complain loudly about those.
610 * Statistics are updated by hardware.
611 */
612 if (ctrl & MACB_BIT(TX_BUF_EXHAUSTED))
613 netdev_err(bp->dev,
614 "BUG: TX buffers exhausted mid-frame\n");
615
616 desc->ctrl = ctrl | MACB_BIT(TX_USED);
617 }
618
619 macb_tx_unmap(bp, tx_skb);
620 }
621
622 /* Set end of TX queue */
623 desc = macb_tx_desc(queue, 0);
624 desc->addr = 0;
625 desc->ctrl = MACB_BIT(TX_USED);
626
627 /* Make descriptor updates visible to hardware */
628 wmb();
629
630 /* Reinitialize the TX desc queue */
631 queue_writel(queue, TBQP, queue->tx_ring_dma);
632 /* Make TX ring reflect state of hardware */
633 queue->tx_head = 0;
634 queue->tx_tail = 0;
635
636 /* Housework before enabling TX IRQ */
637 macb_writel(bp, TSR, macb_readl(bp, TSR));
638 queue_writel(queue, IER, MACB_TX_INT_FLAGS);
639
640 /* Now we are ready to start transmission again */
641 netif_tx_start_all_queues(bp->dev);
642 macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
643
644 spin_unlock_irqrestore(&bp->lock, flags);
645 }
646
647 static void macb_tx_interrupt(struct macb_queue *queue)
648 {
649 unsigned int tail;
650 unsigned int head;
651 u32 status;
652 struct macb *bp = queue->bp;
653 u16 queue_index = queue - bp->queues;
654
655 status = macb_readl(bp, TSR);
656 macb_writel(bp, TSR, status);
657
658 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
659 queue_writel(queue, ISR, MACB_BIT(TCOMP));
660
661 netdev_vdbg(bp->dev, "macb_tx_interrupt status = 0x%03lx\n",
662 (unsigned long)status);
663
664 head = queue->tx_head;
665 for (tail = queue->tx_tail; tail != head; tail++) {
666 struct macb_tx_skb *tx_skb;
667 struct sk_buff *skb;
668 struct macb_dma_desc *desc;
669 u32 ctrl;
670
671 desc = macb_tx_desc(queue, tail);
672
673 /* Make hw descriptor updates visible to CPU */
674 rmb();
675
676 ctrl = desc->ctrl;
677
678 /* TX_USED bit is only set by hardware on the very first buffer
679 * descriptor of the transmitted frame.
680 */
681 if (!(ctrl & MACB_BIT(TX_USED)))
682 break;
683
684 /* Process all buffers of the current transmitted frame */
685 for (;; tail++) {
686 tx_skb = macb_tx_skb(queue, tail);
687 skb = tx_skb->skb;
688
689 /* First, update TX stats if needed */
690 if (skb) {
691 netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n",
692 macb_tx_ring_wrap(tail), skb->data);
693 bp->stats.tx_packets++;
694 bp->stats.tx_bytes += skb->len;
695 }
696
697 /* Now we can safely release resources */
698 macb_tx_unmap(bp, tx_skb);
699
700 /* skb is set only for the last buffer of the frame.
701 * WARNING: at this point skb has been freed by
702 * macb_tx_unmap().
703 */
704 if (skb)
705 break;
706 }
707 }
708
709 queue->tx_tail = tail;
710 if (__netif_subqueue_stopped(bp->dev, queue_index) &&
711 CIRC_CNT(queue->tx_head, queue->tx_tail,
712 TX_RING_SIZE) <= MACB_TX_WAKEUP_THRESH)
713 netif_wake_subqueue(bp->dev, queue_index);
714 }
715
716 static void gem_rx_refill(struct macb *bp)
717 {
718 unsigned int entry;
719 struct sk_buff *skb;
720 dma_addr_t paddr;
721
722 while (CIRC_SPACE(bp->rx_prepared_head, bp->rx_tail, RX_RING_SIZE) > 0) {
723 entry = macb_rx_ring_wrap(bp->rx_prepared_head);
724
725 /* Make hw descriptor updates visible to CPU */
726 rmb();
727
728 bp->rx_prepared_head++;
729
730 if (bp->rx_skbuff[entry] == NULL) {
731 /* allocate sk_buff for this free entry in ring */
732 skb = netdev_alloc_skb(bp->dev, bp->rx_buffer_size);
733 if (unlikely(skb == NULL)) {
734 netdev_err(bp->dev,
735 "Unable to allocate sk_buff\n");
736 break;
737 }
738
739 /* now fill corresponding descriptor entry */
740 paddr = dma_map_single(&bp->pdev->dev, skb->data,
741 bp->rx_buffer_size, DMA_FROM_DEVICE);
742 if (dma_mapping_error(&bp->pdev->dev, paddr)) {
743 dev_kfree_skb(skb);
744 break;
745 }
746
747 bp->rx_skbuff[entry] = skb;
748
749 if (entry == RX_RING_SIZE - 1)
750 paddr |= MACB_BIT(RX_WRAP);
751 bp->rx_ring[entry].addr = paddr;
752 bp->rx_ring[entry].ctrl = 0;
753
754 /* properly align Ethernet header */
755 skb_reserve(skb, NET_IP_ALIGN);
756 } else {
757 bp->rx_ring[entry].addr &= ~MACB_BIT(RX_USED);
758 bp->rx_ring[entry].ctrl = 0;
759 }
760 }
761
762 /* Make descriptor updates visible to hardware */
763 wmb();
764
765 netdev_vdbg(bp->dev, "rx ring: prepared head %d, tail %d\n",
766 bp->rx_prepared_head, bp->rx_tail);
767 }
768
769 /* Mark DMA descriptors from begin up to and not including end as unused */
770 static void discard_partial_frame(struct macb *bp, unsigned int begin,
771 unsigned int end)
772 {
773 unsigned int frag;
774
775 for (frag = begin; frag != end; frag++) {
776 struct macb_dma_desc *desc = macb_rx_desc(bp, frag);
777 desc->addr &= ~MACB_BIT(RX_USED);
778 }
779
780 /* Make descriptor updates visible to hardware */
781 wmb();
782
783 /*
784 * When this happens, the hardware stats registers for
785 * whatever caused this is updated, so we don't have to record
786 * anything.
787 */
788 }
789
790 static int gem_rx(struct macb *bp, int budget)
791 {
792 unsigned int len;
793 unsigned int entry;
794 struct sk_buff *skb;
795 struct macb_dma_desc *desc;
796 int count = 0;
797
798 while (count < budget) {
799 u32 addr, ctrl;
800
801 entry = macb_rx_ring_wrap(bp->rx_tail);
802 desc = &bp->rx_ring[entry];
803
804 /* Make hw descriptor updates visible to CPU */
805 rmb();
806
807 addr = desc->addr;
808 ctrl = desc->ctrl;
809
810 if (!(addr & MACB_BIT(RX_USED)))
811 break;
812
813 bp->rx_tail++;
814 count++;
815
816 if (!(ctrl & MACB_BIT(RX_SOF) && ctrl & MACB_BIT(RX_EOF))) {
817 netdev_err(bp->dev,
818 "not whole frame pointed by descriptor\n");
819 bp->stats.rx_dropped++;
820 break;
821 }
822 skb = bp->rx_skbuff[entry];
823 if (unlikely(!skb)) {
824 netdev_err(bp->dev,
825 "inconsistent Rx descriptor chain\n");
826 bp->stats.rx_dropped++;
827 break;
828 }
829 /* now everything is ready for receiving packet */
830 bp->rx_skbuff[entry] = NULL;
831 len = ctrl & bp->rx_frm_len_mask;
832
833 netdev_vdbg(bp->dev, "gem_rx %u (len %u)\n", entry, len);
834
835 skb_put(skb, len);
836 addr = MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, addr));
837 dma_unmap_single(&bp->pdev->dev, addr,
838 bp->rx_buffer_size, DMA_FROM_DEVICE);
839
840 skb->protocol = eth_type_trans(skb, bp->dev);
841 skb_checksum_none_assert(skb);
842 if (bp->dev->features & NETIF_F_RXCSUM &&
843 !(bp->dev->flags & IFF_PROMISC) &&
844 GEM_BFEXT(RX_CSUM, ctrl) & GEM_RX_CSUM_CHECKED_MASK)
845 skb->ip_summed = CHECKSUM_UNNECESSARY;
846
847 bp->stats.rx_packets++;
848 bp->stats.rx_bytes += skb->len;
849
850 #if defined(DEBUG) && defined(VERBOSE_DEBUG)
851 netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
852 skb->len, skb->csum);
853 print_hex_dump(KERN_DEBUG, " mac: ", DUMP_PREFIX_ADDRESS, 16, 1,
854 skb_mac_header(skb), 16, true);
855 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_ADDRESS, 16, 1,
856 skb->data, 32, true);
857 #endif
858
859 netif_receive_skb(skb);
860 }
861
862 gem_rx_refill(bp);
863
864 return count;
865 }
866
867 static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
868 unsigned int last_frag)
869 {
870 unsigned int len;
871 unsigned int frag;
872 unsigned int offset;
873 struct sk_buff *skb;
874 struct macb_dma_desc *desc;
875
876 desc = macb_rx_desc(bp, last_frag);
877 len = desc->ctrl & bp->rx_frm_len_mask;
878
879 netdev_vdbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n",
880 macb_rx_ring_wrap(first_frag),
881 macb_rx_ring_wrap(last_frag), len);
882
883 /*
884 * The ethernet header starts NET_IP_ALIGN bytes into the
885 * first buffer. Since the header is 14 bytes, this makes the
886 * payload word-aligned.
887 *
888 * Instead of calling skb_reserve(NET_IP_ALIGN), we just copy
889 * the two padding bytes into the skb so that we avoid hitting
890 * the slowpath in memcpy(), and pull them off afterwards.
891 */
892 skb = netdev_alloc_skb(bp->dev, len + NET_IP_ALIGN);
893 if (!skb) {
894 bp->stats.rx_dropped++;
895 for (frag = first_frag; ; frag++) {
896 desc = macb_rx_desc(bp, frag);
897 desc->addr &= ~MACB_BIT(RX_USED);
898 if (frag == last_frag)
899 break;
900 }
901
902 /* Make descriptor updates visible to hardware */
903 wmb();
904
905 return 1;
906 }
907
908 offset = 0;
909 len += NET_IP_ALIGN;
910 skb_checksum_none_assert(skb);
911 skb_put(skb, len);
912
913 for (frag = first_frag; ; frag++) {
914 unsigned int frag_len = bp->rx_buffer_size;
915
916 if (offset + frag_len > len) {
917 BUG_ON(frag != last_frag);
918 frag_len = len - offset;
919 }
920 skb_copy_to_linear_data_offset(skb, offset,
921 macb_rx_buffer(bp, frag), frag_len);
922 offset += bp->rx_buffer_size;
923 desc = macb_rx_desc(bp, frag);
924 desc->addr &= ~MACB_BIT(RX_USED);
925
926 if (frag == last_frag)
927 break;
928 }
929
930 /* Make descriptor updates visible to hardware */
931 wmb();
932
933 __skb_pull(skb, NET_IP_ALIGN);
934 skb->protocol = eth_type_trans(skb, bp->dev);
935
936 bp->stats.rx_packets++;
937 bp->stats.rx_bytes += skb->len;
938 netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
939 skb->len, skb->csum);
940 netif_receive_skb(skb);
941
942 return 0;
943 }
944
945 static int macb_rx(struct macb *bp, int budget)
946 {
947 int received = 0;
948 unsigned int tail;
949 int first_frag = -1;
950
951 for (tail = bp->rx_tail; budget > 0; tail++) {
952 struct macb_dma_desc *desc = macb_rx_desc(bp, tail);
953 u32 addr, ctrl;
954
955 /* Make hw descriptor updates visible to CPU */
956 rmb();
957
958 addr = desc->addr;
959 ctrl = desc->ctrl;
960
961 if (!(addr & MACB_BIT(RX_USED)))
962 break;
963
964 if (ctrl & MACB_BIT(RX_SOF)) {
965 if (first_frag != -1)
966 discard_partial_frame(bp, first_frag, tail);
967 first_frag = tail;
968 }
969
970 if (ctrl & MACB_BIT(RX_EOF)) {
971 int dropped;
972 BUG_ON(first_frag == -1);
973
974 dropped = macb_rx_frame(bp, first_frag, tail);
975 first_frag = -1;
976 if (!dropped) {
977 received++;
978 budget--;
979 }
980 }
981 }
982
983 if (first_frag != -1)
984 bp->rx_tail = first_frag;
985 else
986 bp->rx_tail = tail;
987
988 return received;
989 }
990
991 static int macb_poll(struct napi_struct *napi, int budget)
992 {
993 struct macb *bp = container_of(napi, struct macb, napi);
994 int work_done;
995 u32 status;
996
997 status = macb_readl(bp, RSR);
998 macb_writel(bp, RSR, status);
999
1000 work_done = 0;
1001
1002 netdev_vdbg(bp->dev, "poll: status = %08lx, budget = %d\n",
1003 (unsigned long)status, budget);
1004
1005 work_done = bp->macbgem_ops.mog_rx(bp, budget);
1006 if (work_done < budget) {
1007 napi_complete(napi);
1008
1009 /* Packets received while interrupts were disabled */
1010 status = macb_readl(bp, RSR);
1011 if (status) {
1012 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1013 macb_writel(bp, ISR, MACB_BIT(RCOMP));
1014 napi_reschedule(napi);
1015 } else {
1016 macb_writel(bp, IER, MACB_RX_INT_FLAGS);
1017 }
1018 }
1019
1020 /* TODO: Handle errors */
1021
1022 return work_done;
1023 }
1024
1025 static irqreturn_t macb_interrupt(int irq, void *dev_id)
1026 {
1027 struct macb_queue *queue = dev_id;
1028 struct macb *bp = queue->bp;
1029 struct net_device *dev = bp->dev;
1030 u32 status, ctrl;
1031
1032 status = queue_readl(queue, ISR);
1033
1034 if (unlikely(!status))
1035 return IRQ_NONE;
1036
1037 spin_lock(&bp->lock);
1038
1039 while (status) {
1040 /* close possible race with dev_close */
1041 if (unlikely(!netif_running(dev))) {
1042 queue_writel(queue, IDR, -1);
1043 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1044 queue_writel(queue, ISR, -1);
1045 break;
1046 }
1047
1048 netdev_vdbg(bp->dev, "queue = %u, isr = 0x%08lx\n",
1049 (unsigned int)(queue - bp->queues),
1050 (unsigned long)status);
1051
1052 if (status & MACB_RX_INT_FLAGS) {
1053 /*
1054 * There's no point taking any more interrupts
1055 * until we have processed the buffers. The
1056 * scheduling call may fail if the poll routine
1057 * is already scheduled, so disable interrupts
1058 * now.
1059 */
1060 queue_writel(queue, IDR, MACB_RX_INT_FLAGS);
1061 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1062 queue_writel(queue, ISR, MACB_BIT(RCOMP));
1063
1064 if (napi_schedule_prep(&bp->napi)) {
1065 netdev_vdbg(bp->dev, "scheduling RX softirq\n");
1066 __napi_schedule(&bp->napi);
1067 }
1068 }
1069
1070 if (unlikely(status & (MACB_TX_ERR_FLAGS))) {
1071 queue_writel(queue, IDR, MACB_TX_INT_FLAGS);
1072 schedule_work(&queue->tx_error_task);
1073
1074 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1075 queue_writel(queue, ISR, MACB_TX_ERR_FLAGS);
1076
1077 break;
1078 }
1079
1080 if (status & MACB_BIT(TCOMP))
1081 macb_tx_interrupt(queue);
1082
1083 /*
1084 * Link change detection isn't possible with RMII, so we'll
1085 * add that if/when we get our hands on a full-blown MII PHY.
1086 */
1087
1088 /* There is a hardware issue under heavy load where DMA can
1089 * stop, this causes endless "used buffer descriptor read"
1090 * interrupts but it can be cleared by re-enabling RX. See
1091 * the at91 manual, section 41.3.1 or the Zynq manual
1092 * section 16.7.4 for details.
1093 */
1094 if (status & MACB_BIT(RXUBR)) {
1095 ctrl = macb_readl(bp, NCR);
1096 macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE));
1097 macb_writel(bp, NCR, ctrl | MACB_BIT(RE));
1098
1099 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1100 macb_writel(bp, ISR, MACB_BIT(RXUBR));
1101 }
1102
1103 if (status & MACB_BIT(ISR_ROVR)) {
1104 /* We missed at least one packet */
1105 if (macb_is_gem(bp))
1106 bp->hw_stats.gem.rx_overruns++;
1107 else
1108 bp->hw_stats.macb.rx_overruns++;
1109
1110 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1111 queue_writel(queue, ISR, MACB_BIT(ISR_ROVR));
1112 }
1113
1114 if (status & MACB_BIT(HRESP)) {
1115 /*
1116 * TODO: Reset the hardware, and maybe move the
1117 * netdev_err to a lower-priority context as well
1118 * (work queue?)
1119 */
1120 netdev_err(dev, "DMA bus error: HRESP not OK\n");
1121
1122 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1123 queue_writel(queue, ISR, MACB_BIT(HRESP));
1124 }
1125
1126 status = queue_readl(queue, ISR);
1127 }
1128
1129 spin_unlock(&bp->lock);
1130
1131 return IRQ_HANDLED;
1132 }
1133
1134 #ifdef CONFIG_NET_POLL_CONTROLLER
1135 /*
1136 * Polling receive - used by netconsole and other diagnostic tools
1137 * to allow network i/o with interrupts disabled.
1138 */
1139 static void macb_poll_controller(struct net_device *dev)
1140 {
1141 struct macb *bp = netdev_priv(dev);
1142 struct macb_queue *queue;
1143 unsigned long flags;
1144 unsigned int q;
1145
1146 local_irq_save(flags);
1147 for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
1148 macb_interrupt(dev->irq, queue);
1149 local_irq_restore(flags);
1150 }
1151 #endif
1152
1153 static unsigned int macb_tx_map(struct macb *bp,
1154 struct macb_queue *queue,
1155 struct sk_buff *skb)
1156 {
1157 dma_addr_t mapping;
1158 unsigned int len, entry, i, tx_head = queue->tx_head;
1159 struct macb_tx_skb *tx_skb = NULL;
1160 struct macb_dma_desc *desc;
1161 unsigned int offset, size, count = 0;
1162 unsigned int f, nr_frags = skb_shinfo(skb)->nr_frags;
1163 unsigned int eof = 1;
1164 u32 ctrl;
1165
1166 /* First, map non-paged data */
1167 len = skb_headlen(skb);
1168 offset = 0;
1169 while (len) {
1170 size = min(len, bp->max_tx_length);
1171 entry = macb_tx_ring_wrap(tx_head);
1172 tx_skb = &queue->tx_skb[entry];
1173
1174 mapping = dma_map_single(&bp->pdev->dev,
1175 skb->data + offset,
1176 size, DMA_TO_DEVICE);
1177 if (dma_mapping_error(&bp->pdev->dev, mapping))
1178 goto dma_error;
1179
1180 /* Save info to properly release resources */
1181 tx_skb->skb = NULL;
1182 tx_skb->mapping = mapping;
1183 tx_skb->size = size;
1184 tx_skb->mapped_as_page = false;
1185
1186 len -= size;
1187 offset += size;
1188 count++;
1189 tx_head++;
1190 }
1191
1192 /* Then, map paged data from fragments */
1193 for (f = 0; f < nr_frags; f++) {
1194 const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
1195
1196 len = skb_frag_size(frag);
1197 offset = 0;
1198 while (len) {
1199 size = min(len, bp->max_tx_length);
1200 entry = macb_tx_ring_wrap(tx_head);
1201 tx_skb = &queue->tx_skb[entry];
1202
1203 mapping = skb_frag_dma_map(&bp->pdev->dev, frag,
1204 offset, size, DMA_TO_DEVICE);
1205 if (dma_mapping_error(&bp->pdev->dev, mapping))
1206 goto dma_error;
1207
1208 /* Save info to properly release resources */
1209 tx_skb->skb = NULL;
1210 tx_skb->mapping = mapping;
1211 tx_skb->size = size;
1212 tx_skb->mapped_as_page = true;
1213
1214 len -= size;
1215 offset += size;
1216 count++;
1217 tx_head++;
1218 }
1219 }
1220
1221 /* Should never happen */
1222 if (unlikely(tx_skb == NULL)) {
1223 netdev_err(bp->dev, "BUG! empty skb!\n");
1224 return 0;
1225 }
1226
1227 /* This is the last buffer of the frame: save socket buffer */
1228 tx_skb->skb = skb;
1229
1230 /* Update TX ring: update buffer descriptors in reverse order
1231 * to avoid race condition
1232 */
1233
1234 /* Set 'TX_USED' bit in buffer descriptor at tx_head position
1235 * to set the end of TX queue
1236 */
1237 i = tx_head;
1238 entry = macb_tx_ring_wrap(i);
1239 ctrl = MACB_BIT(TX_USED);
1240 desc = &queue->tx_ring[entry];
1241 desc->ctrl = ctrl;
1242
1243 do {
1244 i--;
1245 entry = macb_tx_ring_wrap(i);
1246 tx_skb = &queue->tx_skb[entry];
1247 desc = &queue->tx_ring[entry];
1248
1249 ctrl = (u32)tx_skb->size;
1250 if (eof) {
1251 ctrl |= MACB_BIT(TX_LAST);
1252 eof = 0;
1253 }
1254 if (unlikely(entry == (TX_RING_SIZE - 1)))
1255 ctrl |= MACB_BIT(TX_WRAP);
1256
1257 /* Set TX buffer descriptor */
1258 desc->addr = tx_skb->mapping;
1259 /* desc->addr must be visible to hardware before clearing
1260 * 'TX_USED' bit in desc->ctrl.
1261 */
1262 wmb();
1263 desc->ctrl = ctrl;
1264 } while (i != queue->tx_head);
1265
1266 queue->tx_head = tx_head;
1267
1268 return count;
1269
1270 dma_error:
1271 netdev_err(bp->dev, "TX DMA map failed\n");
1272
1273 for (i = queue->tx_head; i != tx_head; i++) {
1274 tx_skb = macb_tx_skb(queue, i);
1275
1276 macb_tx_unmap(bp, tx_skb);
1277 }
1278
1279 return 0;
1280 }
1281
1282 static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
1283 {
1284 u16 queue_index = skb_get_queue_mapping(skb);
1285 struct macb *bp = netdev_priv(dev);
1286 struct macb_queue *queue = &bp->queues[queue_index];
1287 unsigned long flags;
1288 unsigned int count, nr_frags, frag_size, f;
1289
1290 #if defined(DEBUG) && defined(VERBOSE_DEBUG)
1291 netdev_vdbg(bp->dev,
1292 "start_xmit: queue %hu len %u head %p data %p tail %p end %p\n",
1293 queue_index, skb->len, skb->head, skb->data,
1294 skb_tail_pointer(skb), skb_end_pointer(skb));
1295 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1,
1296 skb->data, 16, true);
1297 #endif
1298
1299 /* Count how many TX buffer descriptors are needed to send this
1300 * socket buffer: skb fragments of jumbo frames may need to be
1301 * splitted into many buffer descriptors.
1302 */
1303 count = DIV_ROUND_UP(skb_headlen(skb), bp->max_tx_length);
1304 nr_frags = skb_shinfo(skb)->nr_frags;
1305 for (f = 0; f < nr_frags; f++) {
1306 frag_size = skb_frag_size(&skb_shinfo(skb)->frags[f]);
1307 count += DIV_ROUND_UP(frag_size, bp->max_tx_length);
1308 }
1309
1310 spin_lock_irqsave(&bp->lock, flags);
1311
1312 /* This is a hard error, log it. */
1313 if (CIRC_SPACE(queue->tx_head, queue->tx_tail, TX_RING_SIZE) < count) {
1314 netif_stop_subqueue(dev, queue_index);
1315 spin_unlock_irqrestore(&bp->lock, flags);
1316 netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n",
1317 queue->tx_head, queue->tx_tail);
1318 return NETDEV_TX_BUSY;
1319 }
1320
1321 /* Map socket buffer for DMA transfer */
1322 if (!macb_tx_map(bp, queue, skb)) {
1323 dev_kfree_skb_any(skb);
1324 goto unlock;
1325 }
1326
1327 /* Make newly initialized descriptor visible to hardware */
1328 wmb();
1329
1330 skb_tx_timestamp(skb);
1331
1332 macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
1333
1334 if (CIRC_SPACE(queue->tx_head, queue->tx_tail, TX_RING_SIZE) < 1)
1335 netif_stop_subqueue(dev, queue_index);
1336
1337 unlock:
1338 spin_unlock_irqrestore(&bp->lock, flags);
1339
1340 return NETDEV_TX_OK;
1341 }
1342
1343 static void macb_init_rx_buffer_size(struct macb *bp, size_t size)
1344 {
1345 if (!macb_is_gem(bp)) {
1346 bp->rx_buffer_size = MACB_RX_BUFFER_SIZE;
1347 } else {
1348 bp->rx_buffer_size = size;
1349
1350 if (bp->rx_buffer_size % RX_BUFFER_MULTIPLE) {
1351 netdev_dbg(bp->dev,
1352 "RX buffer must be multiple of %d bytes, expanding\n",
1353 RX_BUFFER_MULTIPLE);
1354 bp->rx_buffer_size =
1355 roundup(bp->rx_buffer_size, RX_BUFFER_MULTIPLE);
1356 }
1357 }
1358
1359 netdev_dbg(bp->dev, "mtu [%u] rx_buffer_size [%Zu]\n",
1360 bp->dev->mtu, bp->rx_buffer_size);
1361 }
1362
1363 static void gem_free_rx_buffers(struct macb *bp)
1364 {
1365 struct sk_buff *skb;
1366 struct macb_dma_desc *desc;
1367 dma_addr_t addr;
1368 int i;
1369
1370 if (!bp->rx_skbuff)
1371 return;
1372
1373 for (i = 0; i < RX_RING_SIZE; i++) {
1374 skb = bp->rx_skbuff[i];
1375
1376 if (skb == NULL)
1377 continue;
1378
1379 desc = &bp->rx_ring[i];
1380 addr = MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, desc->addr));
1381 dma_unmap_single(&bp->pdev->dev, addr, bp->rx_buffer_size,
1382 DMA_FROM_DEVICE);
1383 dev_kfree_skb_any(skb);
1384 skb = NULL;
1385 }
1386
1387 kfree(bp->rx_skbuff);
1388 bp->rx_skbuff = NULL;
1389 }
1390
1391 static void macb_free_rx_buffers(struct macb *bp)
1392 {
1393 if (bp->rx_buffers) {
1394 dma_free_coherent(&bp->pdev->dev,
1395 RX_RING_SIZE * bp->rx_buffer_size,
1396 bp->rx_buffers, bp->rx_buffers_dma);
1397 bp->rx_buffers = NULL;
1398 }
1399 }
1400
1401 static void macb_free_consistent(struct macb *bp)
1402 {
1403 struct macb_queue *queue;
1404 unsigned int q;
1405
1406 bp->macbgem_ops.mog_free_rx_buffers(bp);
1407 if (bp->rx_ring) {
1408 dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES,
1409 bp->rx_ring, bp->rx_ring_dma);
1410 bp->rx_ring = NULL;
1411 }
1412
1413 for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
1414 kfree(queue->tx_skb);
1415 queue->tx_skb = NULL;
1416 if (queue->tx_ring) {
1417 dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES,
1418 queue->tx_ring, queue->tx_ring_dma);
1419 queue->tx_ring = NULL;
1420 }
1421 }
1422 }
1423
1424 static int gem_alloc_rx_buffers(struct macb *bp)
1425 {
1426 int size;
1427
1428 size = RX_RING_SIZE * sizeof(struct sk_buff *);
1429 bp->rx_skbuff = kzalloc(size, GFP_KERNEL);
1430 if (!bp->rx_skbuff)
1431 return -ENOMEM;
1432 else
1433 netdev_dbg(bp->dev,
1434 "Allocated %d RX struct sk_buff entries at %p\n",
1435 RX_RING_SIZE, bp->rx_skbuff);
1436 return 0;
1437 }
1438
1439 static int macb_alloc_rx_buffers(struct macb *bp)
1440 {
1441 int size;
1442
1443 size = RX_RING_SIZE * bp->rx_buffer_size;
1444 bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size,
1445 &bp->rx_buffers_dma, GFP_KERNEL);
1446 if (!bp->rx_buffers)
1447 return -ENOMEM;
1448 else
1449 netdev_dbg(bp->dev,
1450 "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n",
1451 size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers);
1452 return 0;
1453 }
1454
1455 static int macb_alloc_consistent(struct macb *bp)
1456 {
1457 struct macb_queue *queue;
1458 unsigned int q;
1459 int size;
1460
1461 for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
1462 size = TX_RING_BYTES;
1463 queue->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
1464 &queue->tx_ring_dma,
1465 GFP_KERNEL);
1466 if (!queue->tx_ring)
1467 goto out_err;
1468 netdev_dbg(bp->dev,
1469 "Allocated TX ring for queue %u of %d bytes at %08lx (mapped %p)\n",
1470 q, size, (unsigned long)queue->tx_ring_dma,
1471 queue->tx_ring);
1472
1473 size = TX_RING_SIZE * sizeof(struct macb_tx_skb);
1474 queue->tx_skb = kmalloc(size, GFP_KERNEL);
1475 if (!queue->tx_skb)
1476 goto out_err;
1477 }
1478
1479 size = RX_RING_BYTES;
1480 bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
1481 &bp->rx_ring_dma, GFP_KERNEL);
1482 if (!bp->rx_ring)
1483 goto out_err;
1484 netdev_dbg(bp->dev,
1485 "Allocated RX ring of %d bytes at %08lx (mapped %p)\n",
1486 size, (unsigned long)bp->rx_ring_dma, bp->rx_ring);
1487
1488 if (bp->macbgem_ops.mog_alloc_rx_buffers(bp))
1489 goto out_err;
1490
1491 return 0;
1492
1493 out_err:
1494 macb_free_consistent(bp);
1495 return -ENOMEM;
1496 }
1497
1498 static void gem_init_rings(struct macb *bp)
1499 {
1500 struct macb_queue *queue;
1501 unsigned int q;
1502 int i;
1503
1504 for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
1505 for (i = 0; i < TX_RING_SIZE; i++) {
1506 queue->tx_ring[i].addr = 0;
1507 queue->tx_ring[i].ctrl = MACB_BIT(TX_USED);
1508 }
1509 queue->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
1510 queue->tx_head = 0;
1511 queue->tx_tail = 0;
1512 }
1513
1514 bp->rx_tail = 0;
1515 bp->rx_prepared_head = 0;
1516
1517 gem_rx_refill(bp);
1518 }
1519
1520 static void macb_init_rings(struct macb *bp)
1521 {
1522 int i;
1523 dma_addr_t addr;
1524
1525 addr = bp->rx_buffers_dma;
1526 for (i = 0; i < RX_RING_SIZE; i++) {
1527 bp->rx_ring[i].addr = addr;
1528 bp->rx_ring[i].ctrl = 0;
1529 addr += bp->rx_buffer_size;
1530 }
1531 bp->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP);
1532
1533 for (i = 0; i < TX_RING_SIZE; i++) {
1534 bp->queues[0].tx_ring[i].addr = 0;
1535 bp->queues[0].tx_ring[i].ctrl = MACB_BIT(TX_USED);
1536 }
1537 bp->queues[0].tx_head = 0;
1538 bp->queues[0].tx_tail = 0;
1539 bp->queues[0].tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
1540
1541 bp->rx_tail = 0;
1542 }
1543
1544 static void macb_reset_hw(struct macb *bp)
1545 {
1546 struct macb_queue *queue;
1547 unsigned int q;
1548
1549 /*
1550 * Disable RX and TX (XXX: Should we halt the transmission
1551 * more gracefully?)
1552 */
1553 macb_writel(bp, NCR, 0);
1554
1555 /* Clear the stats registers (XXX: Update stats first?) */
1556 macb_writel(bp, NCR, MACB_BIT(CLRSTAT));
1557
1558 /* Clear all status flags */
1559 macb_writel(bp, TSR, -1);
1560 macb_writel(bp, RSR, -1);
1561
1562 /* Disable all interrupts */
1563 for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
1564 queue_writel(queue, IDR, -1);
1565 queue_readl(queue, ISR);
1566 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1567 queue_writel(queue, ISR, -1);
1568 }
1569 }
1570
1571 static u32 gem_mdc_clk_div(struct macb *bp)
1572 {
1573 u32 config;
1574 unsigned long pclk_hz = clk_get_rate(bp->pclk);
1575
1576 if (pclk_hz <= 20000000)
1577 config = GEM_BF(CLK, GEM_CLK_DIV8);
1578 else if (pclk_hz <= 40000000)
1579 config = GEM_BF(CLK, GEM_CLK_DIV16);
1580 else if (pclk_hz <= 80000000)
1581 config = GEM_BF(CLK, GEM_CLK_DIV32);
1582 else if (pclk_hz <= 120000000)
1583 config = GEM_BF(CLK, GEM_CLK_DIV48);
1584 else if (pclk_hz <= 160000000)
1585 config = GEM_BF(CLK, GEM_CLK_DIV64);
1586 else
1587 config = GEM_BF(CLK, GEM_CLK_DIV96);
1588
1589 return config;
1590 }
1591
1592 static u32 macb_mdc_clk_div(struct macb *bp)
1593 {
1594 u32 config;
1595 unsigned long pclk_hz;
1596
1597 if (macb_is_gem(bp))
1598 return gem_mdc_clk_div(bp);
1599
1600 pclk_hz = clk_get_rate(bp->pclk);
1601 if (pclk_hz <= 20000000)
1602 config = MACB_BF(CLK, MACB_CLK_DIV8);
1603 else if (pclk_hz <= 40000000)
1604 config = MACB_BF(CLK, MACB_CLK_DIV16);
1605 else if (pclk_hz <= 80000000)
1606 config = MACB_BF(CLK, MACB_CLK_DIV32);
1607 else
1608 config = MACB_BF(CLK, MACB_CLK_DIV64);
1609
1610 return config;
1611 }
1612
1613 /*
1614 * Get the DMA bus width field of the network configuration register that we
1615 * should program. We find the width from decoding the design configuration
1616 * register to find the maximum supported data bus width.
1617 */
1618 static u32 macb_dbw(struct macb *bp)
1619 {
1620 if (!macb_is_gem(bp))
1621 return 0;
1622
1623 switch (GEM_BFEXT(DBWDEF, gem_readl(bp, DCFG1))) {
1624 case 4:
1625 return GEM_BF(DBW, GEM_DBW128);
1626 case 2:
1627 return GEM_BF(DBW, GEM_DBW64);
1628 case 1:
1629 default:
1630 return GEM_BF(DBW, GEM_DBW32);
1631 }
1632 }
1633
1634 /*
1635 * Configure the receive DMA engine
1636 * - use the correct receive buffer size
1637 * - set best burst length for DMA operations
1638 * (if not supported by FIFO, it will fallback to default)
1639 * - set both rx/tx packet buffers to full memory size
1640 * These are configurable parameters for GEM.
1641 */
1642 static void macb_configure_dma(struct macb *bp)
1643 {
1644 u32 dmacfg;
1645
1646 if (macb_is_gem(bp)) {
1647 dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L);
1648 dmacfg |= GEM_BF(RXBS, bp->rx_buffer_size / RX_BUFFER_MULTIPLE);
1649 if (bp->dma_burst_length)
1650 dmacfg = GEM_BFINS(FBLDO, bp->dma_burst_length, dmacfg);
1651 dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L);
1652 dmacfg &= ~GEM_BIT(ENDIA_PKT);
1653
1654 if (bp->native_io)
1655 dmacfg &= ~GEM_BIT(ENDIA_DESC);
1656 else
1657 dmacfg |= GEM_BIT(ENDIA_DESC); /* CPU in big endian */
1658
1659 if (bp->dev->features & NETIF_F_HW_CSUM)
1660 dmacfg |= GEM_BIT(TXCOEN);
1661 else
1662 dmacfg &= ~GEM_BIT(TXCOEN);
1663 netdev_dbg(bp->dev, "Cadence configure DMA with 0x%08x\n",
1664 dmacfg);
1665 gem_writel(bp, DMACFG, dmacfg);
1666 }
1667 }
1668
1669 static void macb_init_hw(struct macb *bp)
1670 {
1671 struct macb_queue *queue;
1672 unsigned int q;
1673
1674 u32 config;
1675
1676 macb_reset_hw(bp);
1677 macb_set_hwaddr(bp);
1678
1679 config = macb_mdc_clk_div(bp);
1680 if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII)
1681 config |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL);
1682 config |= MACB_BF(RBOF, NET_IP_ALIGN); /* Make eth data aligned */
1683 config |= MACB_BIT(PAE); /* PAuse Enable */
1684 config |= MACB_BIT(DRFCS); /* Discard Rx FCS */
1685 if (bp->caps & MACB_CAPS_JUMBO)
1686 config |= MACB_BIT(JFRAME); /* Enable jumbo frames */
1687 else
1688 config |= MACB_BIT(BIG); /* Receive oversized frames */
1689 if (bp->dev->flags & IFF_PROMISC)
1690 config |= MACB_BIT(CAF); /* Copy All Frames */
1691 else if (macb_is_gem(bp) && bp->dev->features & NETIF_F_RXCSUM)
1692 config |= GEM_BIT(RXCOEN);
1693 if (!(bp->dev->flags & IFF_BROADCAST))
1694 config |= MACB_BIT(NBC); /* No BroadCast */
1695 config |= macb_dbw(bp);
1696 macb_writel(bp, NCFGR, config);
1697 if ((bp->caps & MACB_CAPS_JUMBO) && bp->jumbo_max_len)
1698 gem_writel(bp, JML, bp->jumbo_max_len);
1699 bp->speed = SPEED_10;
1700 bp->duplex = DUPLEX_HALF;
1701 bp->rx_frm_len_mask = MACB_RX_FRMLEN_MASK;
1702 if (bp->caps & MACB_CAPS_JUMBO)
1703 bp->rx_frm_len_mask = MACB_RX_JFRMLEN_MASK;
1704
1705 macb_configure_dma(bp);
1706
1707 /* Initialize TX and RX buffers */
1708 macb_writel(bp, RBQP, bp->rx_ring_dma);
1709 for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
1710 queue_writel(queue, TBQP, queue->tx_ring_dma);
1711
1712 /* Enable interrupts */
1713 queue_writel(queue, IER,
1714 MACB_RX_INT_FLAGS |
1715 MACB_TX_INT_FLAGS |
1716 MACB_BIT(HRESP));
1717 }
1718
1719 /* Enable TX and RX */
1720 macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE));
1721 }
1722
1723 /*
1724 * The hash address register is 64 bits long and takes up two
1725 * locations in the memory map. The least significant bits are stored
1726 * in EMAC_HSL and the most significant bits in EMAC_HSH.
1727 *
1728 * The unicast hash enable and the multicast hash enable bits in the
1729 * network configuration register enable the reception of hash matched
1730 * frames. The destination address is reduced to a 6 bit index into
1731 * the 64 bit hash register using the following hash function. The
1732 * hash function is an exclusive or of every sixth bit of the
1733 * destination address.
1734 *
1735 * hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
1736 * hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
1737 * hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
1738 * hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
1739 * hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
1740 * hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
1741 *
1742 * da[0] represents the least significant bit of the first byte
1743 * received, that is, the multicast/unicast indicator, and da[47]
1744 * represents the most significant bit of the last byte received. If
1745 * the hash index, hi[n], points to a bit that is set in the hash
1746 * register then the frame will be matched according to whether the
1747 * frame is multicast or unicast. A multicast match will be signalled
1748 * if the multicast hash enable bit is set, da[0] is 1 and the hash
1749 * index points to a bit set in the hash register. A unicast match
1750 * will be signalled if the unicast hash enable bit is set, da[0] is 0
1751 * and the hash index points to a bit set in the hash register. To
1752 * receive all multicast frames, the hash register should be set with
1753 * all ones and the multicast hash enable bit should be set in the
1754 * network configuration register.
1755 */
1756
1757 static inline int hash_bit_value(int bitnr, __u8 *addr)
1758 {
1759 if (addr[bitnr / 8] & (1 << (bitnr % 8)))
1760 return 1;
1761 return 0;
1762 }
1763
1764 /*
1765 * Return the hash index value for the specified address.
1766 */
1767 static int hash_get_index(__u8 *addr)
1768 {
1769 int i, j, bitval;
1770 int hash_index = 0;
1771
1772 for (j = 0; j < 6; j++) {
1773 for (i = 0, bitval = 0; i < 8; i++)
1774 bitval ^= hash_bit_value(i * 6 + j, addr);
1775
1776 hash_index |= (bitval << j);
1777 }
1778
1779 return hash_index;
1780 }
1781
1782 /*
1783 * Add multicast addresses to the internal multicast-hash table.
1784 */
1785 static void macb_sethashtable(struct net_device *dev)
1786 {
1787 struct netdev_hw_addr *ha;
1788 unsigned long mc_filter[2];
1789 unsigned int bitnr;
1790 struct macb *bp = netdev_priv(dev);
1791
1792 mc_filter[0] = mc_filter[1] = 0;
1793
1794 netdev_for_each_mc_addr(ha, dev) {
1795 bitnr = hash_get_index(ha->addr);
1796 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1797 }
1798
1799 macb_or_gem_writel(bp, HRB, mc_filter[0]);
1800 macb_or_gem_writel(bp, HRT, mc_filter[1]);
1801 }
1802
1803 /*
1804 * Enable/Disable promiscuous and multicast modes.
1805 */
1806 static void macb_set_rx_mode(struct net_device *dev)
1807 {
1808 unsigned long cfg;
1809 struct macb *bp = netdev_priv(dev);
1810
1811 cfg = macb_readl(bp, NCFGR);
1812
1813 if (dev->flags & IFF_PROMISC) {
1814 /* Enable promiscuous mode */
1815 cfg |= MACB_BIT(CAF);
1816
1817 /* Disable RX checksum offload */
1818 if (macb_is_gem(bp))
1819 cfg &= ~GEM_BIT(RXCOEN);
1820 } else {
1821 /* Disable promiscuous mode */
1822 cfg &= ~MACB_BIT(CAF);
1823
1824 /* Enable RX checksum offload only if requested */
1825 if (macb_is_gem(bp) && dev->features & NETIF_F_RXCSUM)
1826 cfg |= GEM_BIT(RXCOEN);
1827 }
1828
1829 if (dev->flags & IFF_ALLMULTI) {
1830 /* Enable all multicast mode */
1831 macb_or_gem_writel(bp, HRB, -1);
1832 macb_or_gem_writel(bp, HRT, -1);
1833 cfg |= MACB_BIT(NCFGR_MTI);
1834 } else if (!netdev_mc_empty(dev)) {
1835 /* Enable specific multicasts */
1836 macb_sethashtable(dev);
1837 cfg |= MACB_BIT(NCFGR_MTI);
1838 } else if (dev->flags & (~IFF_ALLMULTI)) {
1839 /* Disable all multicast mode */
1840 macb_or_gem_writel(bp, HRB, 0);
1841 macb_or_gem_writel(bp, HRT, 0);
1842 cfg &= ~MACB_BIT(NCFGR_MTI);
1843 }
1844
1845 macb_writel(bp, NCFGR, cfg);
1846 }
1847
1848 static int macb_open(struct net_device *dev)
1849 {
1850 struct macb *bp = netdev_priv(dev);
1851 size_t bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN;
1852 int err;
1853
1854 netdev_dbg(bp->dev, "open\n");
1855
1856 /* carrier starts down */
1857 netif_carrier_off(dev);
1858
1859 /* if the phy is not yet register, retry later*/
1860 if (!bp->phy_dev)
1861 return -EAGAIN;
1862
1863 /* RX buffers initialization */
1864 macb_init_rx_buffer_size(bp, bufsz);
1865
1866 err = macb_alloc_consistent(bp);
1867 if (err) {
1868 netdev_err(dev, "Unable to allocate DMA memory (error %d)\n",
1869 err);
1870 return err;
1871 }
1872
1873 napi_enable(&bp->napi);
1874
1875 bp->macbgem_ops.mog_init_rings(bp);
1876 macb_init_hw(bp);
1877
1878 /* schedule a link state check */
1879 phy_start(bp->phy_dev);
1880
1881 netif_tx_start_all_queues(dev);
1882
1883 return 0;
1884 }
1885
1886 static int macb_close(struct net_device *dev)
1887 {
1888 struct macb *bp = netdev_priv(dev);
1889 unsigned long flags;
1890
1891 netif_tx_stop_all_queues(dev);
1892 napi_disable(&bp->napi);
1893
1894 if (bp->phy_dev)
1895 phy_stop(bp->phy_dev);
1896
1897 spin_lock_irqsave(&bp->lock, flags);
1898 macb_reset_hw(bp);
1899 netif_carrier_off(dev);
1900 spin_unlock_irqrestore(&bp->lock, flags);
1901
1902 macb_free_consistent(bp);
1903
1904 return 0;
1905 }
1906
1907 static int macb_change_mtu(struct net_device *dev, int new_mtu)
1908 {
1909 struct macb *bp = netdev_priv(dev);
1910 u32 max_mtu;
1911
1912 if (netif_running(dev))
1913 return -EBUSY;
1914
1915 max_mtu = ETH_DATA_LEN;
1916 if (bp->caps & MACB_CAPS_JUMBO)
1917 max_mtu = gem_readl(bp, JML) - ETH_HLEN - ETH_FCS_LEN;
1918
1919 if ((new_mtu > max_mtu) || (new_mtu < GEM_MTU_MIN_SIZE))
1920 return -EINVAL;
1921
1922 dev->mtu = new_mtu;
1923
1924 return 0;
1925 }
1926
1927 static void gem_update_stats(struct macb *bp)
1928 {
1929 unsigned int i;
1930 u32 *p = &bp->hw_stats.gem.tx_octets_31_0;
1931
1932 for (i = 0; i < GEM_STATS_LEN; ++i, ++p) {
1933 u32 offset = gem_statistics[i].offset;
1934 u64 val = bp->macb_reg_readl(bp, offset);
1935
1936 bp->ethtool_stats[i] += val;
1937 *p += val;
1938
1939 if (offset == GEM_OCTTXL || offset == GEM_OCTRXL) {
1940 /* Add GEM_OCTTXH, GEM_OCTRXH */
1941 val = bp->macb_reg_readl(bp, offset + 4);
1942 bp->ethtool_stats[i] += ((u64)val) << 32;
1943 *(++p) += val;
1944 }
1945 }
1946 }
1947
1948 static struct net_device_stats *gem_get_stats(struct macb *bp)
1949 {
1950 struct gem_stats *hwstat = &bp->hw_stats.gem;
1951 struct net_device_stats *nstat = &bp->stats;
1952
1953 gem_update_stats(bp);
1954
1955 nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors +
1956 hwstat->rx_alignment_errors +
1957 hwstat->rx_resource_errors +
1958 hwstat->rx_overruns +
1959 hwstat->rx_oversize_frames +
1960 hwstat->rx_jabbers +
1961 hwstat->rx_undersized_frames +
1962 hwstat->rx_length_field_frame_errors);
1963 nstat->tx_errors = (hwstat->tx_late_collisions +
1964 hwstat->tx_excessive_collisions +
1965 hwstat->tx_underrun +
1966 hwstat->tx_carrier_sense_errors);
1967 nstat->multicast = hwstat->rx_multicast_frames;
1968 nstat->collisions = (hwstat->tx_single_collision_frames +
1969 hwstat->tx_multiple_collision_frames +
1970 hwstat->tx_excessive_collisions);
1971 nstat->rx_length_errors = (hwstat->rx_oversize_frames +
1972 hwstat->rx_jabbers +
1973 hwstat->rx_undersized_frames +
1974 hwstat->rx_length_field_frame_errors);
1975 nstat->rx_over_errors = hwstat->rx_resource_errors;
1976 nstat->rx_crc_errors = hwstat->rx_frame_check_sequence_errors;
1977 nstat->rx_frame_errors = hwstat->rx_alignment_errors;
1978 nstat->rx_fifo_errors = hwstat->rx_overruns;
1979 nstat->tx_aborted_errors = hwstat->tx_excessive_collisions;
1980 nstat->tx_carrier_errors = hwstat->tx_carrier_sense_errors;
1981 nstat->tx_fifo_errors = hwstat->tx_underrun;
1982
1983 return nstat;
1984 }
1985
1986 static void gem_get_ethtool_stats(struct net_device *dev,
1987 struct ethtool_stats *stats, u64 *data)
1988 {
1989 struct macb *bp;
1990
1991 bp = netdev_priv(dev);
1992 gem_update_stats(bp);
1993 memcpy(data, &bp->ethtool_stats, sizeof(u64) * GEM_STATS_LEN);
1994 }
1995
1996 static int gem_get_sset_count(struct net_device *dev, int sset)
1997 {
1998 switch (sset) {
1999 case ETH_SS_STATS:
2000 return GEM_STATS_LEN;
2001 default:
2002 return -EOPNOTSUPP;
2003 }
2004 }
2005
2006 static void gem_get_ethtool_strings(struct net_device *dev, u32 sset, u8 *p)
2007 {
2008 unsigned int i;
2009
2010 switch (sset) {
2011 case ETH_SS_STATS:
2012 for (i = 0; i < GEM_STATS_LEN; i++, p += ETH_GSTRING_LEN)
2013 memcpy(p, gem_statistics[i].stat_string,
2014 ETH_GSTRING_LEN);
2015 break;
2016 }
2017 }
2018
2019 static struct net_device_stats *macb_get_stats(struct net_device *dev)
2020 {
2021 struct macb *bp = netdev_priv(dev);
2022 struct net_device_stats *nstat = &bp->stats;
2023 struct macb_stats *hwstat = &bp->hw_stats.macb;
2024
2025 if (macb_is_gem(bp))
2026 return gem_get_stats(bp);
2027
2028 /* read stats from hardware */
2029 macb_update_stats(bp);
2030
2031 /* Convert HW stats into netdevice stats */
2032 nstat->rx_errors = (hwstat->rx_fcs_errors +
2033 hwstat->rx_align_errors +
2034 hwstat->rx_resource_errors +
2035 hwstat->rx_overruns +
2036 hwstat->rx_oversize_pkts +
2037 hwstat->rx_jabbers +
2038 hwstat->rx_undersize_pkts +
2039 hwstat->rx_length_mismatch);
2040 nstat->tx_errors = (hwstat->tx_late_cols +
2041 hwstat->tx_excessive_cols +
2042 hwstat->tx_underruns +
2043 hwstat->tx_carrier_errors +
2044 hwstat->sqe_test_errors);
2045 nstat->collisions = (hwstat->tx_single_cols +
2046 hwstat->tx_multiple_cols +
2047 hwstat->tx_excessive_cols);
2048 nstat->rx_length_errors = (hwstat->rx_oversize_pkts +
2049 hwstat->rx_jabbers +
2050 hwstat->rx_undersize_pkts +
2051 hwstat->rx_length_mismatch);
2052 nstat->rx_over_errors = hwstat->rx_resource_errors +
2053 hwstat->rx_overruns;
2054 nstat->rx_crc_errors = hwstat->rx_fcs_errors;
2055 nstat->rx_frame_errors = hwstat->rx_align_errors;
2056 nstat->rx_fifo_errors = hwstat->rx_overruns;
2057 /* XXX: What does "missed" mean? */
2058 nstat->tx_aborted_errors = hwstat->tx_excessive_cols;
2059 nstat->tx_carrier_errors = hwstat->tx_carrier_errors;
2060 nstat->tx_fifo_errors = hwstat->tx_underruns;
2061 /* Don't know about heartbeat or window errors... */
2062
2063 return nstat;
2064 }
2065
2066 static int macb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
2067 {
2068 struct macb *bp = netdev_priv(dev);
2069 struct phy_device *phydev = bp->phy_dev;
2070
2071 if (!phydev)
2072 return -ENODEV;
2073
2074 return phy_ethtool_gset(phydev, cmd);
2075 }
2076
2077 static int macb_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
2078 {
2079 struct macb *bp = netdev_priv(dev);
2080 struct phy_device *phydev = bp->phy_dev;
2081
2082 if (!phydev)
2083 return -ENODEV;
2084
2085 return phy_ethtool_sset(phydev, cmd);
2086 }
2087
2088 static int macb_get_regs_len(struct net_device *netdev)
2089 {
2090 return MACB_GREGS_NBR * sizeof(u32);
2091 }
2092
2093 static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs,
2094 void *p)
2095 {
2096 struct macb *bp = netdev_priv(dev);
2097 unsigned int tail, head;
2098 u32 *regs_buff = p;
2099
2100 regs->version = (macb_readl(bp, MID) & ((1 << MACB_REV_SIZE) - 1))
2101 | MACB_GREGS_VERSION;
2102
2103 tail = macb_tx_ring_wrap(bp->queues[0].tx_tail);
2104 head = macb_tx_ring_wrap(bp->queues[0].tx_head);
2105
2106 regs_buff[0] = macb_readl(bp, NCR);
2107 regs_buff[1] = macb_or_gem_readl(bp, NCFGR);
2108 regs_buff[2] = macb_readl(bp, NSR);
2109 regs_buff[3] = macb_readl(bp, TSR);
2110 regs_buff[4] = macb_readl(bp, RBQP);
2111 regs_buff[5] = macb_readl(bp, TBQP);
2112 regs_buff[6] = macb_readl(bp, RSR);
2113 regs_buff[7] = macb_readl(bp, IMR);
2114
2115 regs_buff[8] = tail;
2116 regs_buff[9] = head;
2117 regs_buff[10] = macb_tx_dma(&bp->queues[0], tail);
2118 regs_buff[11] = macb_tx_dma(&bp->queues[0], head);
2119
2120 if (!(bp->caps & MACB_CAPS_USRIO_DISABLED))
2121 regs_buff[12] = macb_or_gem_readl(bp, USRIO);
2122 if (macb_is_gem(bp)) {
2123 regs_buff[13] = gem_readl(bp, DMACFG);
2124 }
2125 }
2126
2127 static const struct ethtool_ops macb_ethtool_ops = {
2128 .get_settings = macb_get_settings,
2129 .set_settings = macb_set_settings,
2130 .get_regs_len = macb_get_regs_len,
2131 .get_regs = macb_get_regs,
2132 .get_link = ethtool_op_get_link,
2133 .get_ts_info = ethtool_op_get_ts_info,
2134 };
2135
2136 static const struct ethtool_ops gem_ethtool_ops = {
2137 .get_settings = macb_get_settings,
2138 .set_settings = macb_set_settings,
2139 .get_regs_len = macb_get_regs_len,
2140 .get_regs = macb_get_regs,
2141 .get_link = ethtool_op_get_link,
2142 .get_ts_info = ethtool_op_get_ts_info,
2143 .get_ethtool_stats = gem_get_ethtool_stats,
2144 .get_strings = gem_get_ethtool_strings,
2145 .get_sset_count = gem_get_sset_count,
2146 };
2147
2148 static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
2149 {
2150 struct macb *bp = netdev_priv(dev);
2151 struct phy_device *phydev = bp->phy_dev;
2152
2153 if (!netif_running(dev))
2154 return -EINVAL;
2155
2156 if (!phydev)
2157 return -ENODEV;
2158
2159 return phy_mii_ioctl(phydev, rq, cmd);
2160 }
2161
2162 static int macb_set_features(struct net_device *netdev,
2163 netdev_features_t features)
2164 {
2165 struct macb *bp = netdev_priv(netdev);
2166 netdev_features_t changed = features ^ netdev->features;
2167
2168 /* TX checksum offload */
2169 if ((changed & NETIF_F_HW_CSUM) && macb_is_gem(bp)) {
2170 u32 dmacfg;
2171
2172 dmacfg = gem_readl(bp, DMACFG);
2173 if (features & NETIF_F_HW_CSUM)
2174 dmacfg |= GEM_BIT(TXCOEN);
2175 else
2176 dmacfg &= ~GEM_BIT(TXCOEN);
2177 gem_writel(bp, DMACFG, dmacfg);
2178 }
2179
2180 /* RX checksum offload */
2181 if ((changed & NETIF_F_RXCSUM) && macb_is_gem(bp)) {
2182 u32 netcfg;
2183
2184 netcfg = gem_readl(bp, NCFGR);
2185 if (features & NETIF_F_RXCSUM &&
2186 !(netdev->flags & IFF_PROMISC))
2187 netcfg |= GEM_BIT(RXCOEN);
2188 else
2189 netcfg &= ~GEM_BIT(RXCOEN);
2190 gem_writel(bp, NCFGR, netcfg);
2191 }
2192
2193 return 0;
2194 }
2195
2196 static const struct net_device_ops macb_netdev_ops = {
2197 .ndo_open = macb_open,
2198 .ndo_stop = macb_close,
2199 .ndo_start_xmit = macb_start_xmit,
2200 .ndo_set_rx_mode = macb_set_rx_mode,
2201 .ndo_get_stats = macb_get_stats,
2202 .ndo_do_ioctl = macb_ioctl,
2203 .ndo_validate_addr = eth_validate_addr,
2204 .ndo_change_mtu = macb_change_mtu,
2205 .ndo_set_mac_address = eth_mac_addr,
2206 #ifdef CONFIG_NET_POLL_CONTROLLER
2207 .ndo_poll_controller = macb_poll_controller,
2208 #endif
2209 .ndo_set_features = macb_set_features,
2210 };
2211
2212 /*
2213 * Configure peripheral capabilities according to device tree
2214 * and integration options used
2215 */
2216 static void macb_configure_caps(struct macb *bp, const struct macb_config *dt_conf)
2217 {
2218 u32 dcfg;
2219
2220 if (dt_conf)
2221 bp->caps = dt_conf->caps;
2222
2223 if (hw_is_gem(bp->regs, bp->native_io)) {
2224 bp->caps |= MACB_CAPS_MACB_IS_GEM;
2225
2226 dcfg = gem_readl(bp, DCFG1);
2227 if (GEM_BFEXT(IRQCOR, dcfg) == 0)
2228 bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE;
2229 dcfg = gem_readl(bp, DCFG2);
2230 if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0)
2231 bp->caps |= MACB_CAPS_FIFO_MODE;
2232 }
2233
2234 dev_dbg(&bp->pdev->dev, "Cadence caps 0x%08x\n", bp->caps);
2235 }
2236
2237 static void macb_probe_queues(void __iomem *mem,
2238 bool native_io,
2239 unsigned int *queue_mask,
2240 unsigned int *num_queues)
2241 {
2242 unsigned int hw_q;
2243
2244 *queue_mask = 0x1;
2245 *num_queues = 1;
2246
2247 /* is it macb or gem ?
2248 *
2249 * We need to read directly from the hardware here because
2250 * we are early in the probe process and don't have the
2251 * MACB_CAPS_MACB_IS_GEM flag positioned
2252 */
2253 if (!hw_is_gem(mem, native_io))
2254 return;
2255
2256 /* bit 0 is never set but queue 0 always exists */
2257 *queue_mask = readl_relaxed(mem + GEM_DCFG6) & 0xff;
2258
2259 *queue_mask |= 0x1;
2260
2261 for (hw_q = 1; hw_q < MACB_MAX_QUEUES; ++hw_q)
2262 if (*queue_mask & (1 << hw_q))
2263 (*num_queues)++;
2264 }
2265
2266 static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
2267 struct clk **hclk, struct clk **tx_clk)
2268 {
2269 int err;
2270
2271 *pclk = devm_clk_get(&pdev->dev, "pclk");
2272 if (IS_ERR(*pclk)) {
2273 err = PTR_ERR(*pclk);
2274 dev_err(&pdev->dev, "failed to get macb_clk (%u)\n", err);
2275 return err;
2276 }
2277
2278 *hclk = devm_clk_get(&pdev->dev, "hclk");
2279 if (IS_ERR(*hclk)) {
2280 err = PTR_ERR(*hclk);
2281 dev_err(&pdev->dev, "failed to get hclk (%u)\n", err);
2282 return err;
2283 }
2284
2285 *tx_clk = devm_clk_get(&pdev->dev, "tx_clk");
2286 if (IS_ERR(*tx_clk))
2287 *tx_clk = NULL;
2288
2289 err = clk_prepare_enable(*pclk);
2290 if (err) {
2291 dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err);
2292 return err;
2293 }
2294
2295 err = clk_prepare_enable(*hclk);
2296 if (err) {
2297 dev_err(&pdev->dev, "failed to enable hclk (%u)\n", err);
2298 goto err_disable_pclk;
2299 }
2300
2301 err = clk_prepare_enable(*tx_clk);
2302 if (err) {
2303 dev_err(&pdev->dev, "failed to enable tx_clk (%u)\n", err);
2304 goto err_disable_hclk;
2305 }
2306
2307 return 0;
2308
2309 err_disable_hclk:
2310 clk_disable_unprepare(*hclk);
2311
2312 err_disable_pclk:
2313 clk_disable_unprepare(*pclk);
2314
2315 return err;
2316 }
2317
2318 static int macb_init(struct platform_device *pdev)
2319 {
2320 struct net_device *dev = platform_get_drvdata(pdev);
2321 unsigned int hw_q, q;
2322 struct macb *bp = netdev_priv(dev);
2323 struct macb_queue *queue;
2324 int err;
2325 u32 val;
2326
2327 /* set the queue register mapping once for all: queue0 has a special
2328 * register mapping but we don't want to test the queue index then
2329 * compute the corresponding register offset at run time.
2330 */
2331 for (hw_q = 0, q = 0; hw_q < MACB_MAX_QUEUES; ++hw_q) {
2332 if (!(bp->queue_mask & (1 << hw_q)))
2333 continue;
2334
2335 queue = &bp->queues[q];
2336 queue->bp = bp;
2337 if (hw_q) {
2338 queue->ISR = GEM_ISR(hw_q - 1);
2339 queue->IER = GEM_IER(hw_q - 1);
2340 queue->IDR = GEM_IDR(hw_q - 1);
2341 queue->IMR = GEM_IMR(hw_q - 1);
2342 queue->TBQP = GEM_TBQP(hw_q - 1);
2343 } else {
2344 /* queue0 uses legacy registers */
2345 queue->ISR = MACB_ISR;
2346 queue->IER = MACB_IER;
2347 queue->IDR = MACB_IDR;
2348 queue->IMR = MACB_IMR;
2349 queue->TBQP = MACB_TBQP;
2350 }
2351
2352 /* get irq: here we use the linux queue index, not the hardware
2353 * queue index. the queue irq definitions in the device tree
2354 * must remove the optional gaps that could exist in the
2355 * hardware queue mask.
2356 */
2357 queue->irq = platform_get_irq(pdev, q);
2358 err = devm_request_irq(&pdev->dev, queue->irq, macb_interrupt,
2359 IRQF_SHARED, dev->name, queue);
2360 if (err) {
2361 dev_err(&pdev->dev,
2362 "Unable to request IRQ %d (error %d)\n",
2363 queue->irq, err);
2364 return err;
2365 }
2366
2367 INIT_WORK(&queue->tx_error_task, macb_tx_error_task);
2368 q++;
2369 }
2370
2371 dev->netdev_ops = &macb_netdev_ops;
2372 netif_napi_add(dev, &bp->napi, macb_poll, 64);
2373
2374 /* setup appropriated routines according to adapter type */
2375 if (macb_is_gem(bp)) {
2376 bp->max_tx_length = GEM_MAX_TX_LEN;
2377 bp->macbgem_ops.mog_alloc_rx_buffers = gem_alloc_rx_buffers;
2378 bp->macbgem_ops.mog_free_rx_buffers = gem_free_rx_buffers;
2379 bp->macbgem_ops.mog_init_rings = gem_init_rings;
2380 bp->macbgem_ops.mog_rx = gem_rx;
2381 dev->ethtool_ops = &gem_ethtool_ops;
2382 } else {
2383 bp->max_tx_length = MACB_MAX_TX_LEN;
2384 bp->macbgem_ops.mog_alloc_rx_buffers = macb_alloc_rx_buffers;
2385 bp->macbgem_ops.mog_free_rx_buffers = macb_free_rx_buffers;
2386 bp->macbgem_ops.mog_init_rings = macb_init_rings;
2387 bp->macbgem_ops.mog_rx = macb_rx;
2388 dev->ethtool_ops = &macb_ethtool_ops;
2389 }
2390
2391 /* Set features */
2392 dev->hw_features = NETIF_F_SG;
2393 /* Checksum offload is only available on gem with packet buffer */
2394 if (macb_is_gem(bp) && !(bp->caps & MACB_CAPS_FIFO_MODE))
2395 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2396 if (bp->caps & MACB_CAPS_SG_DISABLED)
2397 dev->hw_features &= ~NETIF_F_SG;
2398 dev->features = dev->hw_features;
2399
2400 if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) {
2401 val = 0;
2402 if (bp->phy_interface == PHY_INTERFACE_MODE_RGMII)
2403 val = GEM_BIT(RGMII);
2404 else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII &&
2405 (bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII))
2406 val = MACB_BIT(RMII);
2407 else if (!(bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII))
2408 val = MACB_BIT(MII);
2409
2410 if (bp->caps & MACB_CAPS_USRIO_HAS_CLKEN)
2411 val |= MACB_BIT(CLKEN);
2412
2413 macb_or_gem_writel(bp, USRIO, val);
2414 }
2415
2416 /* Set MII management clock divider */
2417 val = macb_mdc_clk_div(bp);
2418 val |= macb_dbw(bp);
2419 if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII)
2420 val |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL);
2421 macb_writel(bp, NCFGR, val);
2422
2423 return 0;
2424 }
2425
2426 #if defined(CONFIG_OF)
2427 /* 1518 rounded up */
2428 #define AT91ETHER_MAX_RBUFF_SZ 0x600
2429 /* max number of receive buffers */
2430 #define AT91ETHER_MAX_RX_DESCR 9
2431
2432 /* Initialize and start the Receiver and Transmit subsystems */
2433 static int at91ether_start(struct net_device *dev)
2434 {
2435 struct macb *lp = netdev_priv(dev);
2436 dma_addr_t addr;
2437 u32 ctl;
2438 int i;
2439
2440 lp->rx_ring = dma_alloc_coherent(&lp->pdev->dev,
2441 (AT91ETHER_MAX_RX_DESCR *
2442 sizeof(struct macb_dma_desc)),
2443 &lp->rx_ring_dma, GFP_KERNEL);
2444 if (!lp->rx_ring)
2445 return -ENOMEM;
2446
2447 lp->rx_buffers = dma_alloc_coherent(&lp->pdev->dev,
2448 AT91ETHER_MAX_RX_DESCR *
2449 AT91ETHER_MAX_RBUFF_SZ,
2450 &lp->rx_buffers_dma, GFP_KERNEL);
2451 if (!lp->rx_buffers) {
2452 dma_free_coherent(&lp->pdev->dev,
2453 AT91ETHER_MAX_RX_DESCR *
2454 sizeof(struct macb_dma_desc),
2455 lp->rx_ring, lp->rx_ring_dma);
2456 lp->rx_ring = NULL;
2457 return -ENOMEM;
2458 }
2459
2460 addr = lp->rx_buffers_dma;
2461 for (i = 0; i < AT91ETHER_MAX_RX_DESCR; i++) {
2462 lp->rx_ring[i].addr = addr;
2463 lp->rx_ring[i].ctrl = 0;
2464 addr += AT91ETHER_MAX_RBUFF_SZ;
2465 }
2466
2467 /* Set the Wrap bit on the last descriptor */
2468 lp->rx_ring[AT91ETHER_MAX_RX_DESCR - 1].addr |= MACB_BIT(RX_WRAP);
2469
2470 /* Reset buffer index */
2471 lp->rx_tail = 0;
2472
2473 /* Program address of descriptor list in Rx Buffer Queue register */
2474 macb_writel(lp, RBQP, lp->rx_ring_dma);
2475
2476 /* Enable Receive and Transmit */
2477 ctl = macb_readl(lp, NCR);
2478 macb_writel(lp, NCR, ctl | MACB_BIT(RE) | MACB_BIT(TE));
2479
2480 return 0;
2481 }
2482
2483 /* Open the ethernet interface */
2484 static int at91ether_open(struct net_device *dev)
2485 {
2486 struct macb *lp = netdev_priv(dev);
2487 u32 ctl;
2488 int ret;
2489
2490 /* Clear internal statistics */
2491 ctl = macb_readl(lp, NCR);
2492 macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT));
2493
2494 macb_set_hwaddr(lp);
2495
2496 ret = at91ether_start(dev);
2497 if (ret)
2498 return ret;
2499
2500 /* Enable MAC interrupts */
2501 macb_writel(lp, IER, MACB_BIT(RCOMP) |
2502 MACB_BIT(RXUBR) |
2503 MACB_BIT(ISR_TUND) |
2504 MACB_BIT(ISR_RLE) |
2505 MACB_BIT(TCOMP) |
2506 MACB_BIT(ISR_ROVR) |
2507 MACB_BIT(HRESP));
2508
2509 /* schedule a link state check */
2510 phy_start(lp->phy_dev);
2511
2512 netif_start_queue(dev);
2513
2514 return 0;
2515 }
2516
2517 /* Close the interface */
2518 static int at91ether_close(struct net_device *dev)
2519 {
2520 struct macb *lp = netdev_priv(dev);
2521 u32 ctl;
2522
2523 /* Disable Receiver and Transmitter */
2524 ctl = macb_readl(lp, NCR);
2525 macb_writel(lp, NCR, ctl & ~(MACB_BIT(TE) | MACB_BIT(RE)));
2526
2527 /* Disable MAC interrupts */
2528 macb_writel(lp, IDR, MACB_BIT(RCOMP) |
2529 MACB_BIT(RXUBR) |
2530 MACB_BIT(ISR_TUND) |
2531 MACB_BIT(ISR_RLE) |
2532 MACB_BIT(TCOMP) |
2533 MACB_BIT(ISR_ROVR) |
2534 MACB_BIT(HRESP));
2535
2536 netif_stop_queue(dev);
2537
2538 dma_free_coherent(&lp->pdev->dev,
2539 AT91ETHER_MAX_RX_DESCR *
2540 sizeof(struct macb_dma_desc),
2541 lp->rx_ring, lp->rx_ring_dma);
2542 lp->rx_ring = NULL;
2543
2544 dma_free_coherent(&lp->pdev->dev,
2545 AT91ETHER_MAX_RX_DESCR * AT91ETHER_MAX_RBUFF_SZ,
2546 lp->rx_buffers, lp->rx_buffers_dma);
2547 lp->rx_buffers = NULL;
2548
2549 return 0;
2550 }
2551
2552 /* Transmit packet */
2553 static int at91ether_start_xmit(struct sk_buff *skb, struct net_device *dev)
2554 {
2555 struct macb *lp = netdev_priv(dev);
2556
2557 if (macb_readl(lp, TSR) & MACB_BIT(RM9200_BNQ)) {
2558 netif_stop_queue(dev);
2559
2560 /* Store packet information (to free when Tx completed) */
2561 lp->skb = skb;
2562 lp->skb_length = skb->len;
2563 lp->skb_physaddr = dma_map_single(NULL, skb->data, skb->len,
2564 DMA_TO_DEVICE);
2565
2566 /* Set address of the data in the Transmit Address register */
2567 macb_writel(lp, TAR, lp->skb_physaddr);
2568 /* Set length of the packet in the Transmit Control register */
2569 macb_writel(lp, TCR, skb->len);
2570
2571 } else {
2572 netdev_err(dev, "%s called, but device is busy!\n", __func__);
2573 return NETDEV_TX_BUSY;
2574 }
2575
2576 return NETDEV_TX_OK;
2577 }
2578
2579 /* Extract received frame from buffer descriptors and sent to upper layers.
2580 * (Called from interrupt context)
2581 */
2582 static void at91ether_rx(struct net_device *dev)
2583 {
2584 struct macb *lp = netdev_priv(dev);
2585 unsigned char *p_recv;
2586 struct sk_buff *skb;
2587 unsigned int pktlen;
2588
2589 while (lp->rx_ring[lp->rx_tail].addr & MACB_BIT(RX_USED)) {
2590 p_recv = lp->rx_buffers + lp->rx_tail * AT91ETHER_MAX_RBUFF_SZ;
2591 pktlen = MACB_BF(RX_FRMLEN, lp->rx_ring[lp->rx_tail].ctrl);
2592 skb = netdev_alloc_skb(dev, pktlen + 2);
2593 if (skb) {
2594 skb_reserve(skb, 2);
2595 memcpy(skb_put(skb, pktlen), p_recv, pktlen);
2596
2597 skb->protocol = eth_type_trans(skb, dev);
2598 lp->stats.rx_packets++;
2599 lp->stats.rx_bytes += pktlen;
2600 netif_rx(skb);
2601 } else {
2602 lp->stats.rx_dropped++;
2603 }
2604
2605 if (lp->rx_ring[lp->rx_tail].ctrl & MACB_BIT(RX_MHASH_MATCH))
2606 lp->stats.multicast++;
2607
2608 /* reset ownership bit */
2609 lp->rx_ring[lp->rx_tail].addr &= ~MACB_BIT(RX_USED);
2610
2611 /* wrap after last buffer */
2612 if (lp->rx_tail == AT91ETHER_MAX_RX_DESCR - 1)
2613 lp->rx_tail = 0;
2614 else
2615 lp->rx_tail++;
2616 }
2617 }
2618
2619 /* MAC interrupt handler */
2620 static irqreturn_t at91ether_interrupt(int irq, void *dev_id)
2621 {
2622 struct net_device *dev = dev_id;
2623 struct macb *lp = netdev_priv(dev);
2624 u32 intstatus, ctl;
2625
2626 /* MAC Interrupt Status register indicates what interrupts are pending.
2627 * It is automatically cleared once read.
2628 */
2629 intstatus = macb_readl(lp, ISR);
2630
2631 /* Receive complete */
2632 if (intstatus & MACB_BIT(RCOMP))
2633 at91ether_rx(dev);
2634
2635 /* Transmit complete */
2636 if (intstatus & MACB_BIT(TCOMP)) {
2637 /* The TCOM bit is set even if the transmission failed */
2638 if (intstatus & (MACB_BIT(ISR_TUND) | MACB_BIT(ISR_RLE)))
2639 lp->stats.tx_errors++;
2640
2641 if (lp->skb) {
2642 dev_kfree_skb_irq(lp->skb);
2643 lp->skb = NULL;
2644 dma_unmap_single(NULL, lp->skb_physaddr,
2645 lp->skb_length, DMA_TO_DEVICE);
2646 lp->stats.tx_packets++;
2647 lp->stats.tx_bytes += lp->skb_length;
2648 }
2649 netif_wake_queue(dev);
2650 }
2651
2652 /* Work-around for EMAC Errata section 41.3.1 */
2653 if (intstatus & MACB_BIT(RXUBR)) {
2654 ctl = macb_readl(lp, NCR);
2655 macb_writel(lp, NCR, ctl & ~MACB_BIT(RE));
2656 macb_writel(lp, NCR, ctl | MACB_BIT(RE));
2657 }
2658
2659 if (intstatus & MACB_BIT(ISR_ROVR))
2660 netdev_err(dev, "ROVR error\n");
2661
2662 return IRQ_HANDLED;
2663 }
2664
2665 #ifdef CONFIG_NET_POLL_CONTROLLER
2666 static void at91ether_poll_controller(struct net_device *dev)
2667 {
2668 unsigned long flags;
2669
2670 local_irq_save(flags);
2671 at91ether_interrupt(dev->irq, dev);
2672 local_irq_restore(flags);
2673 }
2674 #endif
2675
2676 static const struct net_device_ops at91ether_netdev_ops = {
2677 .ndo_open = at91ether_open,
2678 .ndo_stop = at91ether_close,
2679 .ndo_start_xmit = at91ether_start_xmit,
2680 .ndo_get_stats = macb_get_stats,
2681 .ndo_set_rx_mode = macb_set_rx_mode,
2682 .ndo_set_mac_address = eth_mac_addr,
2683 .ndo_do_ioctl = macb_ioctl,
2684 .ndo_validate_addr = eth_validate_addr,
2685 .ndo_change_mtu = eth_change_mtu,
2686 #ifdef CONFIG_NET_POLL_CONTROLLER
2687 .ndo_poll_controller = at91ether_poll_controller,
2688 #endif
2689 };
2690
2691 static int at91ether_clk_init(struct platform_device *pdev, struct clk **pclk,
2692 struct clk **hclk, struct clk **tx_clk)
2693 {
2694 int err;
2695
2696 *hclk = NULL;
2697 *tx_clk = NULL;
2698
2699 *pclk = devm_clk_get(&pdev->dev, "ether_clk");
2700 if (IS_ERR(*pclk))
2701 return PTR_ERR(*pclk);
2702
2703 err = clk_prepare_enable(*pclk);
2704 if (err) {
2705 dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err);
2706 return err;
2707 }
2708
2709 return 0;
2710 }
2711
2712 static int at91ether_init(struct platform_device *pdev)
2713 {
2714 struct net_device *dev = platform_get_drvdata(pdev);
2715 struct macb *bp = netdev_priv(dev);
2716 int err;
2717 u32 reg;
2718
2719 dev->netdev_ops = &at91ether_netdev_ops;
2720 dev->ethtool_ops = &macb_ethtool_ops;
2721
2722 err = devm_request_irq(&pdev->dev, dev->irq, at91ether_interrupt,
2723 0, dev->name, dev);
2724 if (err)
2725 return err;
2726
2727 macb_writel(bp, NCR, 0);
2728
2729 reg = MACB_BF(CLK, MACB_CLK_DIV32) | MACB_BIT(BIG);
2730 if (bp->phy_interface == PHY_INTERFACE_MODE_RMII)
2731 reg |= MACB_BIT(RM9200_RMII);
2732
2733 macb_writel(bp, NCFGR, reg);
2734
2735 return 0;
2736 }
2737
2738 static const struct macb_config at91sam9260_config = {
2739 .caps = MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII,
2740 .clk_init = macb_clk_init,
2741 .init = macb_init,
2742 };
2743
2744 static const struct macb_config pc302gem_config = {
2745 .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE,
2746 .dma_burst_length = 16,
2747 .clk_init = macb_clk_init,
2748 .init = macb_init,
2749 };
2750
2751 static const struct macb_config sama5d2_config = {
2752 .caps = 0,
2753 .dma_burst_length = 16,
2754 .clk_init = macb_clk_init,
2755 .init = macb_init,
2756 };
2757
2758 static const struct macb_config sama5d3_config = {
2759 .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE,
2760 .dma_burst_length = 16,
2761 .clk_init = macb_clk_init,
2762 .init = macb_init,
2763 };
2764
2765 static const struct macb_config sama5d4_config = {
2766 .caps = 0,
2767 .dma_burst_length = 4,
2768 .clk_init = macb_clk_init,
2769 .init = macb_init,
2770 };
2771
2772 static const struct macb_config emac_config = {
2773 .clk_init = at91ether_clk_init,
2774 .init = at91ether_init,
2775 };
2776
2777 static const struct macb_config np4_config = {
2778 .caps = MACB_CAPS_USRIO_DISABLED,
2779 .clk_init = macb_clk_init,
2780 .init = macb_init,
2781 };
2782
2783 static const struct macb_config zynqmp_config = {
2784 .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO,
2785 .dma_burst_length = 16,
2786 .clk_init = macb_clk_init,
2787 .init = macb_init,
2788 .jumbo_max_len = 10240,
2789 };
2790
2791 static const struct macb_config zynq_config = {
2792 .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_NO_GIGABIT_HALF,
2793 .dma_burst_length = 16,
2794 .clk_init = macb_clk_init,
2795 .init = macb_init,
2796 };
2797
2798 static const struct of_device_id macb_dt_ids[] = {
2799 { .compatible = "cdns,at32ap7000-macb" },
2800 { .compatible = "cdns,at91sam9260-macb", .data = &at91sam9260_config },
2801 { .compatible = "cdns,macb" },
2802 { .compatible = "cdns,np4-macb", .data = &np4_config },
2803 { .compatible = "cdns,pc302-gem", .data = &pc302gem_config },
2804 { .compatible = "cdns,gem", .data = &pc302gem_config },
2805 { .compatible = "atmel,sama5d2-gem", .data = &sama5d2_config },
2806 { .compatible = "atmel,sama5d3-gem", .data = &sama5d3_config },
2807 { .compatible = "atmel,sama5d4-gem", .data = &sama5d4_config },
2808 { .compatible = "cdns,at91rm9200-emac", .data = &emac_config },
2809 { .compatible = "cdns,emac", .data = &emac_config },
2810 { .compatible = "cdns,zynqmp-gem", .data = &zynqmp_config},
2811 { .compatible = "cdns,zynq-gem", .data = &zynq_config },
2812 { /* sentinel */ }
2813 };
2814 MODULE_DEVICE_TABLE(of, macb_dt_ids);
2815 #endif /* CONFIG_OF */
2816
2817 static int macb_probe(struct platform_device *pdev)
2818 {
2819 int (*clk_init)(struct platform_device *, struct clk **,
2820 struct clk **, struct clk **)
2821 = macb_clk_init;
2822 int (*init)(struct platform_device *) = macb_init;
2823 struct device_node *np = pdev->dev.of_node;
2824 struct device_node *phy_node;
2825 const struct macb_config *macb_config = NULL;
2826 struct clk *pclk, *hclk = NULL, *tx_clk = NULL;
2827 unsigned int queue_mask, num_queues;
2828 struct macb_platform_data *pdata;
2829 bool native_io;
2830 struct phy_device *phydev;
2831 struct net_device *dev;
2832 struct resource *regs;
2833 void __iomem *mem;
2834 const char *mac;
2835 struct macb *bp;
2836 int err;
2837
2838 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2839 mem = devm_ioremap_resource(&pdev->dev, regs);
2840 if (IS_ERR(mem))
2841 return PTR_ERR(mem);
2842
2843 if (np) {
2844 const struct of_device_id *match;
2845
2846 match = of_match_node(macb_dt_ids, np);
2847 if (match && match->data) {
2848 macb_config = match->data;
2849 clk_init = macb_config->clk_init;
2850 init = macb_config->init;
2851 }
2852 }
2853
2854 err = clk_init(pdev, &pclk, &hclk, &tx_clk);
2855 if (err)
2856 return err;
2857
2858 native_io = hw_is_native_io(mem);
2859
2860 macb_probe_queues(mem, native_io, &queue_mask, &num_queues);
2861 dev = alloc_etherdev_mq(sizeof(*bp), num_queues);
2862 if (!dev) {
2863 err = -ENOMEM;
2864 goto err_disable_clocks;
2865 }
2866
2867 dev->base_addr = regs->start;
2868
2869 SET_NETDEV_DEV(dev, &pdev->dev);
2870
2871 bp = netdev_priv(dev);
2872 bp->pdev = pdev;
2873 bp->dev = dev;
2874 bp->regs = mem;
2875 bp->native_io = native_io;
2876 if (native_io) {
2877 bp->macb_reg_readl = hw_readl_native;
2878 bp->macb_reg_writel = hw_writel_native;
2879 } else {
2880 bp->macb_reg_readl = hw_readl;
2881 bp->macb_reg_writel = hw_writel;
2882 }
2883 bp->num_queues = num_queues;
2884 bp->queue_mask = queue_mask;
2885 if (macb_config)
2886 bp->dma_burst_length = macb_config->dma_burst_length;
2887 bp->pclk = pclk;
2888 bp->hclk = hclk;
2889 bp->tx_clk = tx_clk;
2890 if (macb_config)
2891 bp->jumbo_max_len = macb_config->jumbo_max_len;
2892
2893 spin_lock_init(&bp->lock);
2894
2895 /* setup capabilities */
2896 macb_configure_caps(bp, macb_config);
2897
2898 platform_set_drvdata(pdev, dev);
2899
2900 dev->irq = platform_get_irq(pdev, 0);
2901 if (dev->irq < 0) {
2902 err = dev->irq;
2903 goto err_disable_clocks;
2904 }
2905
2906 mac = of_get_mac_address(np);
2907 if (mac)
2908 memcpy(bp->dev->dev_addr, mac, ETH_ALEN);
2909 else
2910 macb_get_hwaddr(bp);
2911
2912 /* Power up the PHY if there is a GPIO reset */
2913 phy_node = of_get_next_available_child(np, NULL);
2914 if (phy_node) {
2915 int gpio = of_get_named_gpio(phy_node, "reset-gpios", 0);
2916 if (gpio_is_valid(gpio))
2917 bp->reset_gpio = gpio_to_desc(gpio);
2918 gpiod_set_value(bp->reset_gpio, GPIOD_OUT_HIGH);
2919 }
2920 of_node_put(phy_node);
2921
2922 err = of_get_phy_mode(np);
2923 if (err < 0) {
2924 pdata = dev_get_platdata(&pdev->dev);
2925 if (pdata && pdata->is_rmii)
2926 bp->phy_interface = PHY_INTERFACE_MODE_RMII;
2927 else
2928 bp->phy_interface = PHY_INTERFACE_MODE_MII;
2929 } else {
2930 bp->phy_interface = err;
2931 }
2932
2933 /* IP specific init */
2934 err = init(pdev);
2935 if (err)
2936 goto err_out_free_netdev;
2937
2938 err = register_netdev(dev);
2939 if (err) {
2940 dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
2941 goto err_out_unregister_netdev;
2942 }
2943
2944 err = macb_mii_init(bp);
2945 if (err)
2946 goto err_out_unregister_netdev;
2947
2948 netif_carrier_off(dev);
2949
2950 netdev_info(dev, "Cadence %s rev 0x%08x at 0x%08lx irq %d (%pM)\n",
2951 macb_is_gem(bp) ? "GEM" : "MACB", macb_readl(bp, MID),
2952 dev->base_addr, dev->irq, dev->dev_addr);
2953
2954 phydev = bp->phy_dev;
2955 phy_attached_info(phydev);
2956
2957 return 0;
2958
2959 err_out_unregister_netdev:
2960 unregister_netdev(dev);
2961
2962 err_out_free_netdev:
2963 free_netdev(dev);
2964
2965 err_disable_clocks:
2966 clk_disable_unprepare(tx_clk);
2967 clk_disable_unprepare(hclk);
2968 clk_disable_unprepare(pclk);
2969
2970 return err;
2971 }
2972
2973 static int macb_remove(struct platform_device *pdev)
2974 {
2975 struct net_device *dev;
2976 struct macb *bp;
2977
2978 dev = platform_get_drvdata(pdev);
2979
2980 if (dev) {
2981 bp = netdev_priv(dev);
2982 if (bp->phy_dev)
2983 phy_disconnect(bp->phy_dev);
2984 mdiobus_unregister(bp->mii_bus);
2985 mdiobus_free(bp->mii_bus);
2986
2987 /* Shutdown the PHY if there is a GPIO reset */
2988 gpiod_set_value(bp->reset_gpio, GPIOD_OUT_LOW);
2989
2990 unregister_netdev(dev);
2991 clk_disable_unprepare(bp->tx_clk);
2992 clk_disable_unprepare(bp->hclk);
2993 clk_disable_unprepare(bp->pclk);
2994 free_netdev(dev);
2995 }
2996
2997 return 0;
2998 }
2999
3000 static int __maybe_unused macb_suspend(struct device *dev)
3001 {
3002 struct platform_device *pdev = to_platform_device(dev);
3003 struct net_device *netdev = platform_get_drvdata(pdev);
3004 struct macb *bp = netdev_priv(netdev);
3005
3006 netif_carrier_off(netdev);
3007 netif_device_detach(netdev);
3008
3009 clk_disable_unprepare(bp->tx_clk);
3010 clk_disable_unprepare(bp->hclk);
3011 clk_disable_unprepare(bp->pclk);
3012
3013 return 0;
3014 }
3015
3016 static int __maybe_unused macb_resume(struct device *dev)
3017 {
3018 struct platform_device *pdev = to_platform_device(dev);
3019 struct net_device *netdev = platform_get_drvdata(pdev);
3020 struct macb *bp = netdev_priv(netdev);
3021
3022 clk_prepare_enable(bp->pclk);
3023 clk_prepare_enable(bp->hclk);
3024 clk_prepare_enable(bp->tx_clk);
3025
3026 netif_device_attach(netdev);
3027
3028 return 0;
3029 }
3030
3031 static SIMPLE_DEV_PM_OPS(macb_pm_ops, macb_suspend, macb_resume);
3032
3033 static struct platform_driver macb_driver = {
3034 .probe = macb_probe,
3035 .remove = macb_remove,
3036 .driver = {
3037 .name = "macb",
3038 .of_match_table = of_match_ptr(macb_dt_ids),
3039 .pm = &macb_pm_ops,
3040 },
3041 };
3042
3043 module_platform_driver(macb_driver);
3044
3045 MODULE_LICENSE("GPL");
3046 MODULE_DESCRIPTION("Cadence MACB/GEM Ethernet driver");
3047 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
3048 MODULE_ALIAS("platform:macb");
Linux kernel - Deliverables
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