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[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 #define MACB_WOL_HAS_MAGIC_PACKET (0x1 << 0)
62 #define MACB_WOL_ENABLED (0x1 << 1)
63
64 /*
65 * Graceful stop timeouts in us. We should allow up to
66 * 1 frame time (10 Mbits/s, full-duplex, ignoring collisions)
67 */
68 #define MACB_HALT_TIMEOUT 1230
69
70 /* Ring buffer accessors */
71 static unsigned int macb_tx_ring_wrap(unsigned int index)
72 {
73 return index & (TX_RING_SIZE - 1);
74 }
75
76 static struct macb_dma_desc *macb_tx_desc(struct macb_queue *queue,
77 unsigned int index)
78 {
79 return &queue->tx_ring[macb_tx_ring_wrap(index)];
80 }
81
82 static struct macb_tx_skb *macb_tx_skb(struct macb_queue *queue,
83 unsigned int index)
84 {
85 return &queue->tx_skb[macb_tx_ring_wrap(index)];
86 }
87
88 static dma_addr_t macb_tx_dma(struct macb_queue *queue, unsigned int index)
89 {
90 dma_addr_t offset;
91
92 offset = macb_tx_ring_wrap(index) * sizeof(struct macb_dma_desc);
93
94 return queue->tx_ring_dma + offset;
95 }
96
97 static unsigned int macb_rx_ring_wrap(unsigned int index)
98 {
99 return index & (RX_RING_SIZE - 1);
100 }
101
102 static struct macb_dma_desc *macb_rx_desc(struct macb *bp, unsigned int index)
103 {
104 return &bp->rx_ring[macb_rx_ring_wrap(index)];
105 }
106
107 static void *macb_rx_buffer(struct macb *bp, unsigned int index)
108 {
109 return bp->rx_buffers + bp->rx_buffer_size * macb_rx_ring_wrap(index);
110 }
111
112 /* I/O accessors */
113 static u32 hw_readl_native(struct macb *bp, int offset)
114 {
115 return __raw_readl(bp->regs + offset);
116 }
117
118 static void hw_writel_native(struct macb *bp, int offset, u32 value)
119 {
120 __raw_writel(value, bp->regs + offset);
121 }
122
123 static u32 hw_readl(struct macb *bp, int offset)
124 {
125 return readl_relaxed(bp->regs + offset);
126 }
127
128 static void hw_writel(struct macb *bp, int offset, u32 value)
129 {
130 writel_relaxed(value, bp->regs + offset);
131 }
132
133 /*
134 * Find the CPU endianness by using the loopback bit of NCR register. When the
135 * CPU is in big endian we need to program swaped mode for management
136 * descriptor access.
137 */
138 static bool hw_is_native_io(void __iomem *addr)
139 {
140 u32 value = MACB_BIT(LLB);
141
142 __raw_writel(value, addr + MACB_NCR);
143 value = __raw_readl(addr + MACB_NCR);
144
145 /* Write 0 back to disable everything */
146 __raw_writel(0, addr + MACB_NCR);
147
148 return value == MACB_BIT(LLB);
149 }
150
151 static bool hw_is_gem(void __iomem *addr, bool native_io)
152 {
153 u32 id;
154
155 if (native_io)
156 id = __raw_readl(addr + MACB_MID);
157 else
158 id = readl_relaxed(addr + MACB_MID);
159
160 return MACB_BFEXT(IDNUM, id) >= 0x2;
161 }
162
163 static void macb_set_hwaddr(struct macb *bp)
164 {
165 u32 bottom;
166 u16 top;
167
168 bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr));
169 macb_or_gem_writel(bp, SA1B, bottom);
170 top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4)));
171 macb_or_gem_writel(bp, SA1T, top);
172
173 /* Clear unused address register sets */
174 macb_or_gem_writel(bp, SA2B, 0);
175 macb_or_gem_writel(bp, SA2T, 0);
176 macb_or_gem_writel(bp, SA3B, 0);
177 macb_or_gem_writel(bp, SA3T, 0);
178 macb_or_gem_writel(bp, SA4B, 0);
179 macb_or_gem_writel(bp, SA4T, 0);
180 }
181
182 static void macb_get_hwaddr(struct macb *bp)
183 {
184 struct macb_platform_data *pdata;
185 u32 bottom;
186 u16 top;
187 u8 addr[6];
188 int i;
189
190 pdata = dev_get_platdata(&bp->pdev->dev);
191
192 /* Check all 4 address register for vaild address */
193 for (i = 0; i < 4; i++) {
194 bottom = macb_or_gem_readl(bp, SA1B + i * 8);
195 top = macb_or_gem_readl(bp, SA1T + i * 8);
196
197 if (pdata && pdata->rev_eth_addr) {
198 addr[5] = bottom & 0xff;
199 addr[4] = (bottom >> 8) & 0xff;
200 addr[3] = (bottom >> 16) & 0xff;
201 addr[2] = (bottom >> 24) & 0xff;
202 addr[1] = top & 0xff;
203 addr[0] = (top & 0xff00) >> 8;
204 } else {
205 addr[0] = bottom & 0xff;
206 addr[1] = (bottom >> 8) & 0xff;
207 addr[2] = (bottom >> 16) & 0xff;
208 addr[3] = (bottom >> 24) & 0xff;
209 addr[4] = top & 0xff;
210 addr[5] = (top >> 8) & 0xff;
211 }
212
213 if (is_valid_ether_addr(addr)) {
214 memcpy(bp->dev->dev_addr, addr, sizeof(addr));
215 return;
216 }
217 }
218
219 dev_info(&bp->pdev->dev, "invalid hw address, using random\n");
220 eth_hw_addr_random(bp->dev);
221 }
222
223 static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
224 {
225 struct macb *bp = bus->priv;
226 int value;
227
228 macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
229 | MACB_BF(RW, MACB_MAN_READ)
230 | MACB_BF(PHYA, mii_id)
231 | MACB_BF(REGA, regnum)
232 | MACB_BF(CODE, MACB_MAN_CODE)));
233
234 /* wait for end of transfer */
235 while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
236 cpu_relax();
237
238 value = MACB_BFEXT(DATA, macb_readl(bp, MAN));
239
240 return value;
241 }
242
243 static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
244 u16 value)
245 {
246 struct macb *bp = bus->priv;
247
248 macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
249 | MACB_BF(RW, MACB_MAN_WRITE)
250 | MACB_BF(PHYA, mii_id)
251 | MACB_BF(REGA, regnum)
252 | MACB_BF(CODE, MACB_MAN_CODE)
253 | MACB_BF(DATA, value)));
254
255 /* wait for end of transfer */
256 while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
257 cpu_relax();
258
259 return 0;
260 }
261
262 /**
263 * macb_set_tx_clk() - Set a clock to a new frequency
264 * @clk Pointer to the clock to change
265 * @rate New frequency in Hz
266 * @dev Pointer to the struct net_device
267 */
268 static void macb_set_tx_clk(struct clk *clk, int speed, struct net_device *dev)
269 {
270 long ferr, rate, rate_rounded;
271
272 if (!clk)
273 return;
274
275 switch (speed) {
276 case SPEED_10:
277 rate = 2500000;
278 break;
279 case SPEED_100:
280 rate = 25000000;
281 break;
282 case SPEED_1000:
283 rate = 125000000;
284 break;
285 default:
286 return;
287 }
288
289 rate_rounded = clk_round_rate(clk, rate);
290 if (rate_rounded < 0)
291 return;
292
293 /* RGMII allows 50 ppm frequency error. Test and warn if this limit
294 * is not satisfied.
295 */
296 ferr = abs(rate_rounded - rate);
297 ferr = DIV_ROUND_UP(ferr, rate / 100000);
298 if (ferr > 5)
299 netdev_warn(dev, "unable to generate target frequency: %ld Hz\n",
300 rate);
301
302 if (clk_set_rate(clk, rate_rounded))
303 netdev_err(dev, "adjusting tx_clk failed.\n");
304 }
305
306 static void macb_handle_link_change(struct net_device *dev)
307 {
308 struct macb *bp = netdev_priv(dev);
309 struct phy_device *phydev = bp->phy_dev;
310 unsigned long flags;
311 int status_change = 0;
312
313 spin_lock_irqsave(&bp->lock, flags);
314
315 if (phydev->link) {
316 if ((bp->speed != phydev->speed) ||
317 (bp->duplex != phydev->duplex)) {
318 u32 reg;
319
320 reg = macb_readl(bp, NCFGR);
321 reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
322 if (macb_is_gem(bp))
323 reg &= ~GEM_BIT(GBE);
324
325 if (phydev->duplex)
326 reg |= MACB_BIT(FD);
327 if (phydev->speed == SPEED_100)
328 reg |= MACB_BIT(SPD);
329 if (phydev->speed == SPEED_1000 &&
330 bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
331 reg |= GEM_BIT(GBE);
332
333 macb_or_gem_writel(bp, NCFGR, reg);
334
335 bp->speed = phydev->speed;
336 bp->duplex = phydev->duplex;
337 status_change = 1;
338 }
339 }
340
341 if (phydev->link != bp->link) {
342 if (!phydev->link) {
343 bp->speed = 0;
344 bp->duplex = -1;
345 }
346 bp->link = phydev->link;
347
348 status_change = 1;
349 }
350
351 spin_unlock_irqrestore(&bp->lock, flags);
352
353 if (status_change) {
354 if (phydev->link) {
355 /* Update the TX clock rate if and only if the link is
356 * up and there has been a link change.
357 */
358 macb_set_tx_clk(bp->tx_clk, phydev->speed, dev);
359
360 netif_carrier_on(dev);
361 netdev_info(dev, "link up (%d/%s)\n",
362 phydev->speed,
363 phydev->duplex == DUPLEX_FULL ?
364 "Full" : "Half");
365 } else {
366 netif_carrier_off(dev);
367 netdev_info(dev, "link down\n");
368 }
369 }
370 }
371
372 /* based on au1000_eth. c*/
373 static int macb_mii_probe(struct net_device *dev)
374 {
375 struct macb *bp = netdev_priv(dev);
376 struct macb_platform_data *pdata;
377 struct phy_device *phydev;
378 int phy_irq;
379 int ret;
380
381 phydev = phy_find_first(bp->mii_bus);
382 if (!phydev) {
383 netdev_err(dev, "no PHY found\n");
384 return -ENXIO;
385 }
386
387 pdata = dev_get_platdata(&bp->pdev->dev);
388 if (pdata && gpio_is_valid(pdata->phy_irq_pin)) {
389 ret = devm_gpio_request(&bp->pdev->dev, pdata->phy_irq_pin, "phy int");
390 if (!ret) {
391 phy_irq = gpio_to_irq(pdata->phy_irq_pin);
392 phydev->irq = (phy_irq < 0) ? PHY_POLL : phy_irq;
393 }
394 }
395
396 /* attach the mac to the phy */
397 ret = phy_connect_direct(dev, phydev, &macb_handle_link_change,
398 bp->phy_interface);
399 if (ret) {
400 netdev_err(dev, "Could not attach to PHY\n");
401 return ret;
402 }
403
404 /* mask with MAC supported features */
405 if (macb_is_gem(bp) && bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
406 phydev->supported &= PHY_GBIT_FEATURES;
407 else
408 phydev->supported &= PHY_BASIC_FEATURES;
409
410 if (bp->caps & MACB_CAPS_NO_GIGABIT_HALF)
411 phydev->supported &= ~SUPPORTED_1000baseT_Half;
412
413 phydev->advertising = phydev->supported;
414
415 bp->link = 0;
416 bp->speed = 0;
417 bp->duplex = -1;
418 bp->phy_dev = phydev;
419
420 return 0;
421 }
422
423 static int macb_mii_init(struct macb *bp)
424 {
425 struct macb_platform_data *pdata;
426 struct device_node *np;
427 int err = -ENXIO, i;
428
429 /* Enable management port */
430 macb_writel(bp, NCR, MACB_BIT(MPE));
431
432 bp->mii_bus = mdiobus_alloc();
433 if (bp->mii_bus == NULL) {
434 err = -ENOMEM;
435 goto err_out;
436 }
437
438 bp->mii_bus->name = "MACB_mii_bus";
439 bp->mii_bus->read = &macb_mdio_read;
440 bp->mii_bus->write = &macb_mdio_write;
441 snprintf(bp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
442 bp->pdev->name, bp->pdev->id);
443 bp->mii_bus->priv = bp;
444 bp->mii_bus->parent = &bp->dev->dev;
445 pdata = dev_get_platdata(&bp->pdev->dev);
446
447 dev_set_drvdata(&bp->dev->dev, bp->mii_bus);
448
449 np = bp->pdev->dev.of_node;
450 if (np) {
451 /* try dt phy registration */
452 err = of_mdiobus_register(bp->mii_bus, np);
453
454 /* fallback to standard phy registration if no phy were
455 found during dt phy registration */
456 if (!err && !phy_find_first(bp->mii_bus)) {
457 for (i = 0; i < PHY_MAX_ADDR; i++) {
458 struct phy_device *phydev;
459
460 phydev = mdiobus_scan(bp->mii_bus, i);
461 if (IS_ERR(phydev) &&
462 PTR_ERR(phydev) != -ENODEV) {
463 err = PTR_ERR(phydev);
464 break;
465 }
466 }
467
468 if (err)
469 goto err_out_unregister_bus;
470 }
471 } else {
472 if (pdata)
473 bp->mii_bus->phy_mask = pdata->phy_mask;
474
475 err = mdiobus_register(bp->mii_bus);
476 }
477
478 if (err)
479 goto err_out_free_mdiobus;
480
481 err = macb_mii_probe(bp->dev);
482 if (err)
483 goto err_out_unregister_bus;
484
485 return 0;
486
487 err_out_unregister_bus:
488 mdiobus_unregister(bp->mii_bus);
489 err_out_free_mdiobus:
490 mdiobus_free(bp->mii_bus);
491 err_out:
492 return err;
493 }
494
495 static void macb_update_stats(struct macb *bp)
496 {
497 u32 *p = &bp->hw_stats.macb.rx_pause_frames;
498 u32 *end = &bp->hw_stats.macb.tx_pause_frames + 1;
499 int offset = MACB_PFR;
500
501 WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4);
502
503 for(; p < end; p++, offset += 4)
504 *p += bp->macb_reg_readl(bp, offset);
505 }
506
507 static int macb_halt_tx(struct macb *bp)
508 {
509 unsigned long halt_time, timeout;
510 u32 status;
511
512 macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(THALT));
513
514 timeout = jiffies + usecs_to_jiffies(MACB_HALT_TIMEOUT);
515 do {
516 halt_time = jiffies;
517 status = macb_readl(bp, TSR);
518 if (!(status & MACB_BIT(TGO)))
519 return 0;
520
521 usleep_range(10, 250);
522 } while (time_before(halt_time, timeout));
523
524 return -ETIMEDOUT;
525 }
526
527 static void macb_tx_unmap(struct macb *bp, struct macb_tx_skb *tx_skb)
528 {
529 if (tx_skb->mapping) {
530 if (tx_skb->mapped_as_page)
531 dma_unmap_page(&bp->pdev->dev, tx_skb->mapping,
532 tx_skb->size, DMA_TO_DEVICE);
533 else
534 dma_unmap_single(&bp->pdev->dev, tx_skb->mapping,
535 tx_skb->size, DMA_TO_DEVICE);
536 tx_skb->mapping = 0;
537 }
538
539 if (tx_skb->skb) {
540 dev_kfree_skb_any(tx_skb->skb);
541 tx_skb->skb = NULL;
542 }
543 }
544
545 static void macb_tx_error_task(struct work_struct *work)
546 {
547 struct macb_queue *queue = container_of(work, struct macb_queue,
548 tx_error_task);
549 struct macb *bp = queue->bp;
550 struct macb_tx_skb *tx_skb;
551 struct macb_dma_desc *desc;
552 struct sk_buff *skb;
553 unsigned int tail;
554 unsigned long flags;
555
556 netdev_vdbg(bp->dev, "macb_tx_error_task: q = %u, t = %u, h = %u\n",
557 (unsigned int)(queue - bp->queues),
558 queue->tx_tail, queue->tx_head);
559
560 /* Prevent the queue IRQ handlers from running: each of them may call
561 * macb_tx_interrupt(), which in turn may call netif_wake_subqueue().
562 * As explained below, we have to halt the transmission before updating
563 * TBQP registers so we call netif_tx_stop_all_queues() to notify the
564 * network engine about the macb/gem being halted.
565 */
566 spin_lock_irqsave(&bp->lock, flags);
567
568 /* Make sure nobody is trying to queue up new packets */
569 netif_tx_stop_all_queues(bp->dev);
570
571 /*
572 * Stop transmission now
573 * (in case we have just queued new packets)
574 * macb/gem must be halted to write TBQP register
575 */
576 if (macb_halt_tx(bp))
577 /* Just complain for now, reinitializing TX path can be good */
578 netdev_err(bp->dev, "BUG: halt tx timed out\n");
579
580 /*
581 * Treat frames in TX queue including the ones that caused the error.
582 * Free transmit buffers in upper layer.
583 */
584 for (tail = queue->tx_tail; tail != queue->tx_head; tail++) {
585 u32 ctrl;
586
587 desc = macb_tx_desc(queue, tail);
588 ctrl = desc->ctrl;
589 tx_skb = macb_tx_skb(queue, tail);
590 skb = tx_skb->skb;
591
592 if (ctrl & MACB_BIT(TX_USED)) {
593 /* skb is set for the last buffer of the frame */
594 while (!skb) {
595 macb_tx_unmap(bp, tx_skb);
596 tail++;
597 tx_skb = macb_tx_skb(queue, tail);
598 skb = tx_skb->skb;
599 }
600
601 /* ctrl still refers to the first buffer descriptor
602 * since it's the only one written back by the hardware
603 */
604 if (!(ctrl & MACB_BIT(TX_BUF_EXHAUSTED))) {
605 netdev_vdbg(bp->dev, "txerr skb %u (data %p) TX complete\n",
606 macb_tx_ring_wrap(tail), skb->data);
607 bp->stats.tx_packets++;
608 bp->stats.tx_bytes += skb->len;
609 }
610 } else {
611 /*
612 * "Buffers exhausted mid-frame" errors may only happen
613 * if the driver is buggy, so complain loudly about those.
614 * Statistics are updated by hardware.
615 */
616 if (ctrl & MACB_BIT(TX_BUF_EXHAUSTED))
617 netdev_err(bp->dev,
618 "BUG: TX buffers exhausted mid-frame\n");
619
620 desc->ctrl = ctrl | MACB_BIT(TX_USED);
621 }
622
623 macb_tx_unmap(bp, tx_skb);
624 }
625
626 /* Set end of TX queue */
627 desc = macb_tx_desc(queue, 0);
628 desc->addr = 0;
629 desc->ctrl = MACB_BIT(TX_USED);
630
631 /* Make descriptor updates visible to hardware */
632 wmb();
633
634 /* Reinitialize the TX desc queue */
635 queue_writel(queue, TBQP, queue->tx_ring_dma);
636 /* Make TX ring reflect state of hardware */
637 queue->tx_head = 0;
638 queue->tx_tail = 0;
639
640 /* Housework before enabling TX IRQ */
641 macb_writel(bp, TSR, macb_readl(bp, TSR));
642 queue_writel(queue, IER, MACB_TX_INT_FLAGS);
643
644 /* Now we are ready to start transmission again */
645 netif_tx_start_all_queues(bp->dev);
646 macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
647
648 spin_unlock_irqrestore(&bp->lock, flags);
649 }
650
651 static void macb_tx_interrupt(struct macb_queue *queue)
652 {
653 unsigned int tail;
654 unsigned int head;
655 u32 status;
656 struct macb *bp = queue->bp;
657 u16 queue_index = queue - bp->queues;
658
659 status = macb_readl(bp, TSR);
660 macb_writel(bp, TSR, status);
661
662 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
663 queue_writel(queue, ISR, MACB_BIT(TCOMP));
664
665 netdev_vdbg(bp->dev, "macb_tx_interrupt status = 0x%03lx\n",
666 (unsigned long)status);
667
668 head = queue->tx_head;
669 for (tail = queue->tx_tail; tail != head; tail++) {
670 struct macb_tx_skb *tx_skb;
671 struct sk_buff *skb;
672 struct macb_dma_desc *desc;
673 u32 ctrl;
674
675 desc = macb_tx_desc(queue, tail);
676
677 /* Make hw descriptor updates visible to CPU */
678 rmb();
679
680 ctrl = desc->ctrl;
681
682 /* TX_USED bit is only set by hardware on the very first buffer
683 * descriptor of the transmitted frame.
684 */
685 if (!(ctrl & MACB_BIT(TX_USED)))
686 break;
687
688 /* Process all buffers of the current transmitted frame */
689 for (;; tail++) {
690 tx_skb = macb_tx_skb(queue, tail);
691 skb = tx_skb->skb;
692
693 /* First, update TX stats if needed */
694 if (skb) {
695 netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n",
696 macb_tx_ring_wrap(tail), skb->data);
697 bp->stats.tx_packets++;
698 bp->stats.tx_bytes += skb->len;
699 }
700
701 /* Now we can safely release resources */
702 macb_tx_unmap(bp, tx_skb);
703
704 /* skb is set only for the last buffer of the frame.
705 * WARNING: at this point skb has been freed by
706 * macb_tx_unmap().
707 */
708 if (skb)
709 break;
710 }
711 }
712
713 queue->tx_tail = tail;
714 if (__netif_subqueue_stopped(bp->dev, queue_index) &&
715 CIRC_CNT(queue->tx_head, queue->tx_tail,
716 TX_RING_SIZE) <= MACB_TX_WAKEUP_THRESH)
717 netif_wake_subqueue(bp->dev, queue_index);
718 }
719
720 static void gem_rx_refill(struct macb *bp)
721 {
722 unsigned int entry;
723 struct sk_buff *skb;
724 dma_addr_t paddr;
725
726 while (CIRC_SPACE(bp->rx_prepared_head, bp->rx_tail, RX_RING_SIZE) > 0) {
727 entry = macb_rx_ring_wrap(bp->rx_prepared_head);
728
729 /* Make hw descriptor updates visible to CPU */
730 rmb();
731
732 bp->rx_prepared_head++;
733
734 if (bp->rx_skbuff[entry] == NULL) {
735 /* allocate sk_buff for this free entry in ring */
736 skb = netdev_alloc_skb(bp->dev, bp->rx_buffer_size);
737 if (unlikely(skb == NULL)) {
738 netdev_err(bp->dev,
739 "Unable to allocate sk_buff\n");
740 break;
741 }
742
743 /* now fill corresponding descriptor entry */
744 paddr = dma_map_single(&bp->pdev->dev, skb->data,
745 bp->rx_buffer_size, DMA_FROM_DEVICE);
746 if (dma_mapping_error(&bp->pdev->dev, paddr)) {
747 dev_kfree_skb(skb);
748 break;
749 }
750
751 bp->rx_skbuff[entry] = skb;
752
753 if (entry == RX_RING_SIZE - 1)
754 paddr |= MACB_BIT(RX_WRAP);
755 bp->rx_ring[entry].addr = paddr;
756 bp->rx_ring[entry].ctrl = 0;
757
758 /* properly align Ethernet header */
759 skb_reserve(skb, NET_IP_ALIGN);
760 } else {
761 bp->rx_ring[entry].addr &= ~MACB_BIT(RX_USED);
762 bp->rx_ring[entry].ctrl = 0;
763 }
764 }
765
766 /* Make descriptor updates visible to hardware */
767 wmb();
768
769 netdev_vdbg(bp->dev, "rx ring: prepared head %d, tail %d\n",
770 bp->rx_prepared_head, bp->rx_tail);
771 }
772
773 /* Mark DMA descriptors from begin up to and not including end as unused */
774 static void discard_partial_frame(struct macb *bp, unsigned int begin,
775 unsigned int end)
776 {
777 unsigned int frag;
778
779 for (frag = begin; frag != end; frag++) {
780 struct macb_dma_desc *desc = macb_rx_desc(bp, frag);
781 desc->addr &= ~MACB_BIT(RX_USED);
782 }
783
784 /* Make descriptor updates visible to hardware */
785 wmb();
786
787 /*
788 * When this happens, the hardware stats registers for
789 * whatever caused this is updated, so we don't have to record
790 * anything.
791 */
792 }
793
794 static int gem_rx(struct macb *bp, int budget)
795 {
796 unsigned int len;
797 unsigned int entry;
798 struct sk_buff *skb;
799 struct macb_dma_desc *desc;
800 int count = 0;
801
802 while (count < budget) {
803 u32 addr, ctrl;
804
805 entry = macb_rx_ring_wrap(bp->rx_tail);
806 desc = &bp->rx_ring[entry];
807
808 /* Make hw descriptor updates visible to CPU */
809 rmb();
810
811 addr = desc->addr;
812 ctrl = desc->ctrl;
813
814 if (!(addr & MACB_BIT(RX_USED)))
815 break;
816
817 bp->rx_tail++;
818 count++;
819
820 if (!(ctrl & MACB_BIT(RX_SOF) && ctrl & MACB_BIT(RX_EOF))) {
821 netdev_err(bp->dev,
822 "not whole frame pointed by descriptor\n");
823 bp->stats.rx_dropped++;
824 break;
825 }
826 skb = bp->rx_skbuff[entry];
827 if (unlikely(!skb)) {
828 netdev_err(bp->dev,
829 "inconsistent Rx descriptor chain\n");
830 bp->stats.rx_dropped++;
831 break;
832 }
833 /* now everything is ready for receiving packet */
834 bp->rx_skbuff[entry] = NULL;
835 len = ctrl & bp->rx_frm_len_mask;
836
837 netdev_vdbg(bp->dev, "gem_rx %u (len %u)\n", entry, len);
838
839 skb_put(skb, len);
840 addr = MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, addr));
841 dma_unmap_single(&bp->pdev->dev, addr,
842 bp->rx_buffer_size, DMA_FROM_DEVICE);
843
844 skb->protocol = eth_type_trans(skb, bp->dev);
845 skb_checksum_none_assert(skb);
846 if (bp->dev->features & NETIF_F_RXCSUM &&
847 !(bp->dev->flags & IFF_PROMISC) &&
848 GEM_BFEXT(RX_CSUM, ctrl) & GEM_RX_CSUM_CHECKED_MASK)
849 skb->ip_summed = CHECKSUM_UNNECESSARY;
850
851 bp->stats.rx_packets++;
852 bp->stats.rx_bytes += skb->len;
853
854 #if defined(DEBUG) && defined(VERBOSE_DEBUG)
855 netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
856 skb->len, skb->csum);
857 print_hex_dump(KERN_DEBUG, " mac: ", DUMP_PREFIX_ADDRESS, 16, 1,
858 skb_mac_header(skb), 16, true);
859 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_ADDRESS, 16, 1,
860 skb->data, 32, true);
861 #endif
862
863 netif_receive_skb(skb);
864 }
865
866 gem_rx_refill(bp);
867
868 return count;
869 }
870
871 static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
872 unsigned int last_frag)
873 {
874 unsigned int len;
875 unsigned int frag;
876 unsigned int offset;
877 struct sk_buff *skb;
878 struct macb_dma_desc *desc;
879
880 desc = macb_rx_desc(bp, last_frag);
881 len = desc->ctrl & bp->rx_frm_len_mask;
882
883 netdev_vdbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n",
884 macb_rx_ring_wrap(first_frag),
885 macb_rx_ring_wrap(last_frag), len);
886
887 /*
888 * The ethernet header starts NET_IP_ALIGN bytes into the
889 * first buffer. Since the header is 14 bytes, this makes the
890 * payload word-aligned.
891 *
892 * Instead of calling skb_reserve(NET_IP_ALIGN), we just copy
893 * the two padding bytes into the skb so that we avoid hitting
894 * the slowpath in memcpy(), and pull them off afterwards.
895 */
896 skb = netdev_alloc_skb(bp->dev, len + NET_IP_ALIGN);
897 if (!skb) {
898 bp->stats.rx_dropped++;
899 for (frag = first_frag; ; frag++) {
900 desc = macb_rx_desc(bp, frag);
901 desc->addr &= ~MACB_BIT(RX_USED);
902 if (frag == last_frag)
903 break;
904 }
905
906 /* Make descriptor updates visible to hardware */
907 wmb();
908
909 return 1;
910 }
911
912 offset = 0;
913 len += NET_IP_ALIGN;
914 skb_checksum_none_assert(skb);
915 skb_put(skb, len);
916
917 for (frag = first_frag; ; frag++) {
918 unsigned int frag_len = bp->rx_buffer_size;
919
920 if (offset + frag_len > len) {
921 if (unlikely(frag != last_frag)) {
922 dev_kfree_skb_any(skb);
923 return -1;
924 }
925 frag_len = len - offset;
926 }
927 skb_copy_to_linear_data_offset(skb, offset,
928 macb_rx_buffer(bp, frag), frag_len);
929 offset += bp->rx_buffer_size;
930 desc = macb_rx_desc(bp, frag);
931 desc->addr &= ~MACB_BIT(RX_USED);
932
933 if (frag == last_frag)
934 break;
935 }
936
937 /* Make descriptor updates visible to hardware */
938 wmb();
939
940 __skb_pull(skb, NET_IP_ALIGN);
941 skb->protocol = eth_type_trans(skb, bp->dev);
942
943 bp->stats.rx_packets++;
944 bp->stats.rx_bytes += skb->len;
945 netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
946 skb->len, skb->csum);
947 netif_receive_skb(skb);
948
949 return 0;
950 }
951
952 static inline void macb_init_rx_ring(struct macb *bp)
953 {
954 dma_addr_t addr;
955 int i;
956
957 addr = bp->rx_buffers_dma;
958 for (i = 0; i < RX_RING_SIZE; i++) {
959 bp->rx_ring[i].addr = addr;
960 bp->rx_ring[i].ctrl = 0;
961 addr += bp->rx_buffer_size;
962 }
963 bp->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP);
964 }
965
966 static int macb_rx(struct macb *bp, int budget)
967 {
968 bool reset_rx_queue = false;
969 int received = 0;
970 unsigned int tail;
971 int first_frag = -1;
972
973 for (tail = bp->rx_tail; budget > 0; tail++) {
974 struct macb_dma_desc *desc = macb_rx_desc(bp, tail);
975 u32 addr, ctrl;
976
977 /* Make hw descriptor updates visible to CPU */
978 rmb();
979
980 addr = desc->addr;
981 ctrl = desc->ctrl;
982
983 if (!(addr & MACB_BIT(RX_USED)))
984 break;
985
986 if (ctrl & MACB_BIT(RX_SOF)) {
987 if (first_frag != -1)
988 discard_partial_frame(bp, first_frag, tail);
989 first_frag = tail;
990 }
991
992 if (ctrl & MACB_BIT(RX_EOF)) {
993 int dropped;
994
995 if (unlikely(first_frag == -1)) {
996 reset_rx_queue = true;
997 continue;
998 }
999
1000 dropped = macb_rx_frame(bp, first_frag, tail);
1001 first_frag = -1;
1002 if (unlikely(dropped < 0)) {
1003 reset_rx_queue = true;
1004 continue;
1005 }
1006 if (!dropped) {
1007 received++;
1008 budget--;
1009 }
1010 }
1011 }
1012
1013 if (unlikely(reset_rx_queue)) {
1014 unsigned long flags;
1015 u32 ctrl;
1016
1017 netdev_err(bp->dev, "RX queue corruption: reset it\n");
1018
1019 spin_lock_irqsave(&bp->lock, flags);
1020
1021 ctrl = macb_readl(bp, NCR);
1022 macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE));
1023
1024 macb_init_rx_ring(bp);
1025 macb_writel(bp, RBQP, bp->rx_ring_dma);
1026
1027 macb_writel(bp, NCR, ctrl | MACB_BIT(RE));
1028
1029 spin_unlock_irqrestore(&bp->lock, flags);
1030 return received;
1031 }
1032
1033 if (first_frag != -1)
1034 bp->rx_tail = first_frag;
1035 else
1036 bp->rx_tail = tail;
1037
1038 return received;
1039 }
1040
1041 static int macb_poll(struct napi_struct *napi, int budget)
1042 {
1043 struct macb *bp = container_of(napi, struct macb, napi);
1044 int work_done;
1045 u32 status;
1046
1047 status = macb_readl(bp, RSR);
1048 macb_writel(bp, RSR, status);
1049
1050 work_done = 0;
1051
1052 netdev_vdbg(bp->dev, "poll: status = %08lx, budget = %d\n",
1053 (unsigned long)status, budget);
1054
1055 work_done = bp->macbgem_ops.mog_rx(bp, budget);
1056 if (work_done < budget) {
1057 napi_complete(napi);
1058
1059 /* Packets received while interrupts were disabled */
1060 status = macb_readl(bp, RSR);
1061 if (status) {
1062 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1063 macb_writel(bp, ISR, MACB_BIT(RCOMP));
1064 napi_reschedule(napi);
1065 } else {
1066 macb_writel(bp, IER, MACB_RX_INT_FLAGS);
1067 }
1068 }
1069
1070 /* TODO: Handle errors */
1071
1072 return work_done;
1073 }
1074
1075 static irqreturn_t macb_interrupt(int irq, void *dev_id)
1076 {
1077 struct macb_queue *queue = dev_id;
1078 struct macb *bp = queue->bp;
1079 struct net_device *dev = bp->dev;
1080 u32 status, ctrl;
1081
1082 status = queue_readl(queue, ISR);
1083
1084 if (unlikely(!status))
1085 return IRQ_NONE;
1086
1087 spin_lock(&bp->lock);
1088
1089 while (status) {
1090 /* close possible race with dev_close */
1091 if (unlikely(!netif_running(dev))) {
1092 queue_writel(queue, IDR, -1);
1093 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1094 queue_writel(queue, ISR, -1);
1095 break;
1096 }
1097
1098 netdev_vdbg(bp->dev, "queue = %u, isr = 0x%08lx\n",
1099 (unsigned int)(queue - bp->queues),
1100 (unsigned long)status);
1101
1102 if (status & MACB_RX_INT_FLAGS) {
1103 /*
1104 * There's no point taking any more interrupts
1105 * until we have processed the buffers. The
1106 * scheduling call may fail if the poll routine
1107 * is already scheduled, so disable interrupts
1108 * now.
1109 */
1110 queue_writel(queue, IDR, MACB_RX_INT_FLAGS);
1111 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1112 queue_writel(queue, ISR, MACB_BIT(RCOMP));
1113
1114 if (napi_schedule_prep(&bp->napi)) {
1115 netdev_vdbg(bp->dev, "scheduling RX softirq\n");
1116 __napi_schedule(&bp->napi);
1117 }
1118 }
1119
1120 if (unlikely(status & (MACB_TX_ERR_FLAGS))) {
1121 queue_writel(queue, IDR, MACB_TX_INT_FLAGS);
1122 schedule_work(&queue->tx_error_task);
1123
1124 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1125 queue_writel(queue, ISR, MACB_TX_ERR_FLAGS);
1126
1127 break;
1128 }
1129
1130 if (status & MACB_BIT(TCOMP))
1131 macb_tx_interrupt(queue);
1132
1133 /*
1134 * Link change detection isn't possible with RMII, so we'll
1135 * add that if/when we get our hands on a full-blown MII PHY.
1136 */
1137
1138 /* There is a hardware issue under heavy load where DMA can
1139 * stop, this causes endless "used buffer descriptor read"
1140 * interrupts but it can be cleared by re-enabling RX. See
1141 * the at91 manual, section 41.3.1 or the Zynq manual
1142 * section 16.7.4 for details.
1143 */
1144 if (status & MACB_BIT(RXUBR)) {
1145 ctrl = macb_readl(bp, NCR);
1146 macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE));
1147 macb_writel(bp, NCR, ctrl | MACB_BIT(RE));
1148
1149 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1150 queue_writel(queue, ISR, MACB_BIT(RXUBR));
1151 }
1152
1153 if (status & MACB_BIT(ISR_ROVR)) {
1154 /* We missed at least one packet */
1155 if (macb_is_gem(bp))
1156 bp->hw_stats.gem.rx_overruns++;
1157 else
1158 bp->hw_stats.macb.rx_overruns++;
1159
1160 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1161 queue_writel(queue, ISR, MACB_BIT(ISR_ROVR));
1162 }
1163
1164 if (status & MACB_BIT(HRESP)) {
1165 /*
1166 * TODO: Reset the hardware, and maybe move the
1167 * netdev_err to a lower-priority context as well
1168 * (work queue?)
1169 */
1170 netdev_err(dev, "DMA bus error: HRESP not OK\n");
1171
1172 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1173 queue_writel(queue, ISR, MACB_BIT(HRESP));
1174 }
1175
1176 status = queue_readl(queue, ISR);
1177 }
1178
1179 spin_unlock(&bp->lock);
1180
1181 return IRQ_HANDLED;
1182 }
1183
1184 #ifdef CONFIG_NET_POLL_CONTROLLER
1185 /*
1186 * Polling receive - used by netconsole and other diagnostic tools
1187 * to allow network i/o with interrupts disabled.
1188 */
1189 static void macb_poll_controller(struct net_device *dev)
1190 {
1191 struct macb *bp = netdev_priv(dev);
1192 struct macb_queue *queue;
1193 unsigned long flags;
1194 unsigned int q;
1195
1196 local_irq_save(flags);
1197 for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
1198 macb_interrupt(dev->irq, queue);
1199 local_irq_restore(flags);
1200 }
1201 #endif
1202
1203 static unsigned int macb_tx_map(struct macb *bp,
1204 struct macb_queue *queue,
1205 struct sk_buff *skb)
1206 {
1207 dma_addr_t mapping;
1208 unsigned int len, entry, i, tx_head = queue->tx_head;
1209 struct macb_tx_skb *tx_skb = NULL;
1210 struct macb_dma_desc *desc;
1211 unsigned int offset, size, count = 0;
1212 unsigned int f, nr_frags = skb_shinfo(skb)->nr_frags;
1213 unsigned int eof = 1;
1214 u32 ctrl;
1215
1216 /* First, map non-paged data */
1217 len = skb_headlen(skb);
1218 offset = 0;
1219 while (len) {
1220 size = min(len, bp->max_tx_length);
1221 entry = macb_tx_ring_wrap(tx_head);
1222 tx_skb = &queue->tx_skb[entry];
1223
1224 mapping = dma_map_single(&bp->pdev->dev,
1225 skb->data + offset,
1226 size, DMA_TO_DEVICE);
1227 if (dma_mapping_error(&bp->pdev->dev, mapping))
1228 goto dma_error;
1229
1230 /* Save info to properly release resources */
1231 tx_skb->skb = NULL;
1232 tx_skb->mapping = mapping;
1233 tx_skb->size = size;
1234 tx_skb->mapped_as_page = false;
1235
1236 len -= size;
1237 offset += size;
1238 count++;
1239 tx_head++;
1240 }
1241
1242 /* Then, map paged data from fragments */
1243 for (f = 0; f < nr_frags; f++) {
1244 const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
1245
1246 len = skb_frag_size(frag);
1247 offset = 0;
1248 while (len) {
1249 size = min(len, bp->max_tx_length);
1250 entry = macb_tx_ring_wrap(tx_head);
1251 tx_skb = &queue->tx_skb[entry];
1252
1253 mapping = skb_frag_dma_map(&bp->pdev->dev, frag,
1254 offset, size, DMA_TO_DEVICE);
1255 if (dma_mapping_error(&bp->pdev->dev, mapping))
1256 goto dma_error;
1257
1258 /* Save info to properly release resources */
1259 tx_skb->skb = NULL;
1260 tx_skb->mapping = mapping;
1261 tx_skb->size = size;
1262 tx_skb->mapped_as_page = true;
1263
1264 len -= size;
1265 offset += size;
1266 count++;
1267 tx_head++;
1268 }
1269 }
1270
1271 /* Should never happen */
1272 if (unlikely(tx_skb == NULL)) {
1273 netdev_err(bp->dev, "BUG! empty skb!\n");
1274 return 0;
1275 }
1276
1277 /* This is the last buffer of the frame: save socket buffer */
1278 tx_skb->skb = skb;
1279
1280 /* Update TX ring: update buffer descriptors in reverse order
1281 * to avoid race condition
1282 */
1283
1284 /* Set 'TX_USED' bit in buffer descriptor at tx_head position
1285 * to set the end of TX queue
1286 */
1287 i = tx_head;
1288 entry = macb_tx_ring_wrap(i);
1289 ctrl = MACB_BIT(TX_USED);
1290 desc = &queue->tx_ring[entry];
1291 desc->ctrl = ctrl;
1292
1293 do {
1294 i--;
1295 entry = macb_tx_ring_wrap(i);
1296 tx_skb = &queue->tx_skb[entry];
1297 desc = &queue->tx_ring[entry];
1298
1299 ctrl = (u32)tx_skb->size;
1300 if (eof) {
1301 ctrl |= MACB_BIT(TX_LAST);
1302 eof = 0;
1303 }
1304 if (unlikely(entry == (TX_RING_SIZE - 1)))
1305 ctrl |= MACB_BIT(TX_WRAP);
1306
1307 /* Set TX buffer descriptor */
1308 desc->addr = tx_skb->mapping;
1309 /* desc->addr must be visible to hardware before clearing
1310 * 'TX_USED' bit in desc->ctrl.
1311 */
1312 wmb();
1313 desc->ctrl = ctrl;
1314 } while (i != queue->tx_head);
1315
1316 queue->tx_head = tx_head;
1317
1318 return count;
1319
1320 dma_error:
1321 netdev_err(bp->dev, "TX DMA map failed\n");
1322
1323 for (i = queue->tx_head; i != tx_head; i++) {
1324 tx_skb = macb_tx_skb(queue, i);
1325
1326 macb_tx_unmap(bp, tx_skb);
1327 }
1328
1329 return 0;
1330 }
1331
1332 static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
1333 {
1334 u16 queue_index = skb_get_queue_mapping(skb);
1335 struct macb *bp = netdev_priv(dev);
1336 struct macb_queue *queue = &bp->queues[queue_index];
1337 unsigned long flags;
1338 unsigned int count, nr_frags, frag_size, f;
1339
1340 #if defined(DEBUG) && defined(VERBOSE_DEBUG)
1341 netdev_vdbg(bp->dev,
1342 "start_xmit: queue %hu len %u head %p data %p tail %p end %p\n",
1343 queue_index, skb->len, skb->head, skb->data,
1344 skb_tail_pointer(skb), skb_end_pointer(skb));
1345 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1,
1346 skb->data, 16, true);
1347 #endif
1348
1349 /* Count how many TX buffer descriptors are needed to send this
1350 * socket buffer: skb fragments of jumbo frames may need to be
1351 * splitted into many buffer descriptors.
1352 */
1353 count = DIV_ROUND_UP(skb_headlen(skb), bp->max_tx_length);
1354 nr_frags = skb_shinfo(skb)->nr_frags;
1355 for (f = 0; f < nr_frags; f++) {
1356 frag_size = skb_frag_size(&skb_shinfo(skb)->frags[f]);
1357 count += DIV_ROUND_UP(frag_size, bp->max_tx_length);
1358 }
1359
1360 spin_lock_irqsave(&bp->lock, flags);
1361
1362 /* This is a hard error, log it. */
1363 if (CIRC_SPACE(queue->tx_head, queue->tx_tail, TX_RING_SIZE) < count) {
1364 netif_stop_subqueue(dev, queue_index);
1365 spin_unlock_irqrestore(&bp->lock, flags);
1366 netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n",
1367 queue->tx_head, queue->tx_tail);
1368 return NETDEV_TX_BUSY;
1369 }
1370
1371 /* Map socket buffer for DMA transfer */
1372 if (!macb_tx_map(bp, queue, skb)) {
1373 dev_kfree_skb_any(skb);
1374 goto unlock;
1375 }
1376
1377 /* Make newly initialized descriptor visible to hardware */
1378 wmb();
1379
1380 skb_tx_timestamp(skb);
1381
1382 macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
1383
1384 if (CIRC_SPACE(queue->tx_head, queue->tx_tail, TX_RING_SIZE) < 1)
1385 netif_stop_subqueue(dev, queue_index);
1386
1387 unlock:
1388 spin_unlock_irqrestore(&bp->lock, flags);
1389
1390 return NETDEV_TX_OK;
1391 }
1392
1393 static void macb_init_rx_buffer_size(struct macb *bp, size_t size)
1394 {
1395 if (!macb_is_gem(bp)) {
1396 bp->rx_buffer_size = MACB_RX_BUFFER_SIZE;
1397 } else {
1398 bp->rx_buffer_size = size;
1399
1400 if (bp->rx_buffer_size % RX_BUFFER_MULTIPLE) {
1401 netdev_dbg(bp->dev,
1402 "RX buffer must be multiple of %d bytes, expanding\n",
1403 RX_BUFFER_MULTIPLE);
1404 bp->rx_buffer_size =
1405 roundup(bp->rx_buffer_size, RX_BUFFER_MULTIPLE);
1406 }
1407 }
1408
1409 netdev_dbg(bp->dev, "mtu [%u] rx_buffer_size [%Zu]\n",
1410 bp->dev->mtu, bp->rx_buffer_size);
1411 }
1412
1413 static void gem_free_rx_buffers(struct macb *bp)
1414 {
1415 struct sk_buff *skb;
1416 struct macb_dma_desc *desc;
1417 dma_addr_t addr;
1418 int i;
1419
1420 if (!bp->rx_skbuff)
1421 return;
1422
1423 for (i = 0; i < RX_RING_SIZE; i++) {
1424 skb = bp->rx_skbuff[i];
1425
1426 if (skb == NULL)
1427 continue;
1428
1429 desc = &bp->rx_ring[i];
1430 addr = MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, desc->addr));
1431 dma_unmap_single(&bp->pdev->dev, addr, bp->rx_buffer_size,
1432 DMA_FROM_DEVICE);
1433 dev_kfree_skb_any(skb);
1434 skb = NULL;
1435 }
1436
1437 kfree(bp->rx_skbuff);
1438 bp->rx_skbuff = NULL;
1439 }
1440
1441 static void macb_free_rx_buffers(struct macb *bp)
1442 {
1443 if (bp->rx_buffers) {
1444 dma_free_coherent(&bp->pdev->dev,
1445 RX_RING_SIZE * bp->rx_buffer_size,
1446 bp->rx_buffers, bp->rx_buffers_dma);
1447 bp->rx_buffers = NULL;
1448 }
1449 }
1450
1451 static void macb_free_consistent(struct macb *bp)
1452 {
1453 struct macb_queue *queue;
1454 unsigned int q;
1455
1456 bp->macbgem_ops.mog_free_rx_buffers(bp);
1457 if (bp->rx_ring) {
1458 dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES,
1459 bp->rx_ring, bp->rx_ring_dma);
1460 bp->rx_ring = NULL;
1461 }
1462
1463 for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
1464 kfree(queue->tx_skb);
1465 queue->tx_skb = NULL;
1466 if (queue->tx_ring) {
1467 dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES,
1468 queue->tx_ring, queue->tx_ring_dma);
1469 queue->tx_ring = NULL;
1470 }
1471 }
1472 }
1473
1474 static int gem_alloc_rx_buffers(struct macb *bp)
1475 {
1476 int size;
1477
1478 size = RX_RING_SIZE * sizeof(struct sk_buff *);
1479 bp->rx_skbuff = kzalloc(size, GFP_KERNEL);
1480 if (!bp->rx_skbuff)
1481 return -ENOMEM;
1482 else
1483 netdev_dbg(bp->dev,
1484 "Allocated %d RX struct sk_buff entries at %p\n",
1485 RX_RING_SIZE, bp->rx_skbuff);
1486 return 0;
1487 }
1488
1489 static int macb_alloc_rx_buffers(struct macb *bp)
1490 {
1491 int size;
1492
1493 size = RX_RING_SIZE * bp->rx_buffer_size;
1494 bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size,
1495 &bp->rx_buffers_dma, GFP_KERNEL);
1496 if (!bp->rx_buffers)
1497 return -ENOMEM;
1498 else
1499 netdev_dbg(bp->dev,
1500 "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n",
1501 size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers);
1502 return 0;
1503 }
1504
1505 static int macb_alloc_consistent(struct macb *bp)
1506 {
1507 struct macb_queue *queue;
1508 unsigned int q;
1509 int size;
1510
1511 for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
1512 size = TX_RING_BYTES;
1513 queue->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
1514 &queue->tx_ring_dma,
1515 GFP_KERNEL);
1516 if (!queue->tx_ring)
1517 goto out_err;
1518 netdev_dbg(bp->dev,
1519 "Allocated TX ring for queue %u of %d bytes at %08lx (mapped %p)\n",
1520 q, size, (unsigned long)queue->tx_ring_dma,
1521 queue->tx_ring);
1522
1523 size = TX_RING_SIZE * sizeof(struct macb_tx_skb);
1524 queue->tx_skb = kmalloc(size, GFP_KERNEL);
1525 if (!queue->tx_skb)
1526 goto out_err;
1527 }
1528
1529 size = RX_RING_BYTES;
1530 bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
1531 &bp->rx_ring_dma, GFP_KERNEL);
1532 if (!bp->rx_ring)
1533 goto out_err;
1534 netdev_dbg(bp->dev,
1535 "Allocated RX ring of %d bytes at %08lx (mapped %p)\n",
1536 size, (unsigned long)bp->rx_ring_dma, bp->rx_ring);
1537
1538 if (bp->macbgem_ops.mog_alloc_rx_buffers(bp))
1539 goto out_err;
1540
1541 return 0;
1542
1543 out_err:
1544 macb_free_consistent(bp);
1545 return -ENOMEM;
1546 }
1547
1548 static void gem_init_rings(struct macb *bp)
1549 {
1550 struct macb_queue *queue;
1551 unsigned int q;
1552 int i;
1553
1554 for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
1555 for (i = 0; i < TX_RING_SIZE; i++) {
1556 queue->tx_ring[i].addr = 0;
1557 queue->tx_ring[i].ctrl = MACB_BIT(TX_USED);
1558 }
1559 queue->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
1560 queue->tx_head = 0;
1561 queue->tx_tail = 0;
1562 }
1563
1564 bp->rx_tail = 0;
1565 bp->rx_prepared_head = 0;
1566
1567 gem_rx_refill(bp);
1568 }
1569
1570 static void macb_init_rings(struct macb *bp)
1571 {
1572 int i;
1573
1574 macb_init_rx_ring(bp);
1575
1576 for (i = 0; i < TX_RING_SIZE; i++) {
1577 bp->queues[0].tx_ring[i].addr = 0;
1578 bp->queues[0].tx_ring[i].ctrl = MACB_BIT(TX_USED);
1579 }
1580 bp->queues[0].tx_head = 0;
1581 bp->queues[0].tx_tail = 0;
1582 bp->queues[0].tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
1583
1584 bp->rx_tail = 0;
1585 }
1586
1587 static void macb_reset_hw(struct macb *bp)
1588 {
1589 struct macb_queue *queue;
1590 unsigned int q;
1591
1592 /*
1593 * Disable RX and TX (XXX: Should we halt the transmission
1594 * more gracefully?)
1595 */
1596 macb_writel(bp, NCR, 0);
1597
1598 /* Clear the stats registers (XXX: Update stats first?) */
1599 macb_writel(bp, NCR, MACB_BIT(CLRSTAT));
1600
1601 /* Clear all status flags */
1602 macb_writel(bp, TSR, -1);
1603 macb_writel(bp, RSR, -1);
1604
1605 /* Disable all interrupts */
1606 for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
1607 queue_writel(queue, IDR, -1);
1608 queue_readl(queue, ISR);
1609 if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1610 queue_writel(queue, ISR, -1);
1611 }
1612 }
1613
1614 static u32 gem_mdc_clk_div(struct macb *bp)
1615 {
1616 u32 config;
1617 unsigned long pclk_hz = clk_get_rate(bp->pclk);
1618
1619 if (pclk_hz <= 20000000)
1620 config = GEM_BF(CLK, GEM_CLK_DIV8);
1621 else if (pclk_hz <= 40000000)
1622 config = GEM_BF(CLK, GEM_CLK_DIV16);
1623 else if (pclk_hz <= 80000000)
1624 config = GEM_BF(CLK, GEM_CLK_DIV32);
1625 else if (pclk_hz <= 120000000)
1626 config = GEM_BF(CLK, GEM_CLK_DIV48);
1627 else if (pclk_hz <= 160000000)
1628 config = GEM_BF(CLK, GEM_CLK_DIV64);
1629 else
1630 config = GEM_BF(CLK, GEM_CLK_DIV96);
1631
1632 return config;
1633 }
1634
1635 static u32 macb_mdc_clk_div(struct macb *bp)
1636 {
1637 u32 config;
1638 unsigned long pclk_hz;
1639
1640 if (macb_is_gem(bp))
1641 return gem_mdc_clk_div(bp);
1642
1643 pclk_hz = clk_get_rate(bp->pclk);
1644 if (pclk_hz <= 20000000)
1645 config = MACB_BF(CLK, MACB_CLK_DIV8);
1646 else if (pclk_hz <= 40000000)
1647 config = MACB_BF(CLK, MACB_CLK_DIV16);
1648 else if (pclk_hz <= 80000000)
1649 config = MACB_BF(CLK, MACB_CLK_DIV32);
1650 else
1651 config = MACB_BF(CLK, MACB_CLK_DIV64);
1652
1653 return config;
1654 }
1655
1656 /*
1657 * Get the DMA bus width field of the network configuration register that we
1658 * should program. We find the width from decoding the design configuration
1659 * register to find the maximum supported data bus width.
1660 */
1661 static u32 macb_dbw(struct macb *bp)
1662 {
1663 if (!macb_is_gem(bp))
1664 return 0;
1665
1666 switch (GEM_BFEXT(DBWDEF, gem_readl(bp, DCFG1))) {
1667 case 4:
1668 return GEM_BF(DBW, GEM_DBW128);
1669 case 2:
1670 return GEM_BF(DBW, GEM_DBW64);
1671 case 1:
1672 default:
1673 return GEM_BF(DBW, GEM_DBW32);
1674 }
1675 }
1676
1677 /*
1678 * Configure the receive DMA engine
1679 * - use the correct receive buffer size
1680 * - set best burst length for DMA operations
1681 * (if not supported by FIFO, it will fallback to default)
1682 * - set both rx/tx packet buffers to full memory size
1683 * These are configurable parameters for GEM.
1684 */
1685 static void macb_configure_dma(struct macb *bp)
1686 {
1687 u32 dmacfg;
1688
1689 if (macb_is_gem(bp)) {
1690 dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L);
1691 dmacfg |= GEM_BF(RXBS, bp->rx_buffer_size / RX_BUFFER_MULTIPLE);
1692 if (bp->dma_burst_length)
1693 dmacfg = GEM_BFINS(FBLDO, bp->dma_burst_length, dmacfg);
1694 dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L);
1695 dmacfg &= ~GEM_BIT(ENDIA_PKT);
1696
1697 if (bp->native_io)
1698 dmacfg &= ~GEM_BIT(ENDIA_DESC);
1699 else
1700 dmacfg |= GEM_BIT(ENDIA_DESC); /* CPU in big endian */
1701
1702 if (bp->dev->features & NETIF_F_HW_CSUM)
1703 dmacfg |= GEM_BIT(TXCOEN);
1704 else
1705 dmacfg &= ~GEM_BIT(TXCOEN);
1706 netdev_dbg(bp->dev, "Cadence configure DMA with 0x%08x\n",
1707 dmacfg);
1708 gem_writel(bp, DMACFG, dmacfg);
1709 }
1710 }
1711
1712 static void macb_init_hw(struct macb *bp)
1713 {
1714 struct macb_queue *queue;
1715 unsigned int q;
1716
1717 u32 config;
1718
1719 macb_reset_hw(bp);
1720 macb_set_hwaddr(bp);
1721
1722 config = macb_mdc_clk_div(bp);
1723 if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII)
1724 config |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL);
1725 config |= MACB_BF(RBOF, NET_IP_ALIGN); /* Make eth data aligned */
1726 config |= MACB_BIT(PAE); /* PAuse Enable */
1727 config |= MACB_BIT(DRFCS); /* Discard Rx FCS */
1728 if (bp->caps & MACB_CAPS_JUMBO)
1729 config |= MACB_BIT(JFRAME); /* Enable jumbo frames */
1730 else
1731 config |= MACB_BIT(BIG); /* Receive oversized frames */
1732 if (bp->dev->flags & IFF_PROMISC)
1733 config |= MACB_BIT(CAF); /* Copy All Frames */
1734 else if (macb_is_gem(bp) && bp->dev->features & NETIF_F_RXCSUM)
1735 config |= GEM_BIT(RXCOEN);
1736 if (!(bp->dev->flags & IFF_BROADCAST))
1737 config |= MACB_BIT(NBC); /* No BroadCast */
1738 config |= macb_dbw(bp);
1739 macb_writel(bp, NCFGR, config);
1740 if ((bp->caps & MACB_CAPS_JUMBO) && bp->jumbo_max_len)
1741 gem_writel(bp, JML, bp->jumbo_max_len);
1742 bp->speed = SPEED_10;
1743 bp->duplex = DUPLEX_HALF;
1744 bp->rx_frm_len_mask = MACB_RX_FRMLEN_MASK;
1745 if (bp->caps & MACB_CAPS_JUMBO)
1746 bp->rx_frm_len_mask = MACB_RX_JFRMLEN_MASK;
1747
1748 macb_configure_dma(bp);
1749
1750 /* Initialize TX and RX buffers */
1751 macb_writel(bp, RBQP, bp->rx_ring_dma);
1752 for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
1753 queue_writel(queue, TBQP, queue->tx_ring_dma);
1754
1755 /* Enable interrupts */
1756 queue_writel(queue, IER,
1757 MACB_RX_INT_FLAGS |
1758 MACB_TX_INT_FLAGS |
1759 MACB_BIT(HRESP));
1760 }
1761
1762 /* Enable TX and RX */
1763 macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE));
1764 }
1765
1766 /*
1767 * The hash address register is 64 bits long and takes up two
1768 * locations in the memory map. The least significant bits are stored
1769 * in EMAC_HSL and the most significant bits in EMAC_HSH.
1770 *
1771 * The unicast hash enable and the multicast hash enable bits in the
1772 * network configuration register enable the reception of hash matched
1773 * frames. The destination address is reduced to a 6 bit index into
1774 * the 64 bit hash register using the following hash function. The
1775 * hash function is an exclusive or of every sixth bit of the
1776 * destination address.
1777 *
1778 * hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
1779 * hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
1780 * hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
1781 * hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
1782 * hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
1783 * hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
1784 *
1785 * da[0] represents the least significant bit of the first byte
1786 * received, that is, the multicast/unicast indicator, and da[47]
1787 * represents the most significant bit of the last byte received. If
1788 * the hash index, hi[n], points to a bit that is set in the hash
1789 * register then the frame will be matched according to whether the
1790 * frame is multicast or unicast. A multicast match will be signalled
1791 * if the multicast hash enable bit is set, da[0] is 1 and the hash
1792 * index points to a bit set in the hash register. A unicast match
1793 * will be signalled if the unicast hash enable bit is set, da[0] is 0
1794 * and the hash index points to a bit set in the hash register. To
1795 * receive all multicast frames, the hash register should be set with
1796 * all ones and the multicast hash enable bit should be set in the
1797 * network configuration register.
1798 */
1799
1800 static inline int hash_bit_value(int bitnr, __u8 *addr)
1801 {
1802 if (addr[bitnr / 8] & (1 << (bitnr % 8)))
1803 return 1;
1804 return 0;
1805 }
1806
1807 /*
1808 * Return the hash index value for the specified address.
1809 */
1810 static int hash_get_index(__u8 *addr)
1811 {
1812 int i, j, bitval;
1813 int hash_index = 0;
1814
1815 for (j = 0; j < 6; j++) {
1816 for (i = 0, bitval = 0; i < 8; i++)
1817 bitval ^= hash_bit_value(i * 6 + j, addr);
1818
1819 hash_index |= (bitval << j);
1820 }
1821
1822 return hash_index;
1823 }
1824
1825 /*
1826 * Add multicast addresses to the internal multicast-hash table.
1827 */
1828 static void macb_sethashtable(struct net_device *dev)
1829 {
1830 struct netdev_hw_addr *ha;
1831 unsigned long mc_filter[2];
1832 unsigned int bitnr;
1833 struct macb *bp = netdev_priv(dev);
1834
1835 mc_filter[0] = mc_filter[1] = 0;
1836
1837 netdev_for_each_mc_addr(ha, dev) {
1838 bitnr = hash_get_index(ha->addr);
1839 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1840 }
1841
1842 macb_or_gem_writel(bp, HRB, mc_filter[0]);
1843 macb_or_gem_writel(bp, HRT, mc_filter[1]);
1844 }
1845
1846 /*
1847 * Enable/Disable promiscuous and multicast modes.
1848 */
1849 static void macb_set_rx_mode(struct net_device *dev)
1850 {
1851 unsigned long cfg;
1852 struct macb *bp = netdev_priv(dev);
1853
1854 cfg = macb_readl(bp, NCFGR);
1855
1856 if (dev->flags & IFF_PROMISC) {
1857 /* Enable promiscuous mode */
1858 cfg |= MACB_BIT(CAF);
1859
1860 /* Disable RX checksum offload */
1861 if (macb_is_gem(bp))
1862 cfg &= ~GEM_BIT(RXCOEN);
1863 } else {
1864 /* Disable promiscuous mode */
1865 cfg &= ~MACB_BIT(CAF);
1866
1867 /* Enable RX checksum offload only if requested */
1868 if (macb_is_gem(bp) && dev->features & NETIF_F_RXCSUM)
1869 cfg |= GEM_BIT(RXCOEN);
1870 }
1871
1872 if (dev->flags & IFF_ALLMULTI) {
1873 /* Enable all multicast mode */
1874 macb_or_gem_writel(bp, HRB, -1);
1875 macb_or_gem_writel(bp, HRT, -1);
1876 cfg |= MACB_BIT(NCFGR_MTI);
1877 } else if (!netdev_mc_empty(dev)) {
1878 /* Enable specific multicasts */
1879 macb_sethashtable(dev);
1880 cfg |= MACB_BIT(NCFGR_MTI);
1881 } else if (dev->flags & (~IFF_ALLMULTI)) {
1882 /* Disable all multicast mode */
1883 macb_or_gem_writel(bp, HRB, 0);
1884 macb_or_gem_writel(bp, HRT, 0);
1885 cfg &= ~MACB_BIT(NCFGR_MTI);
1886 }
1887
1888 macb_writel(bp, NCFGR, cfg);
1889 }
1890
1891 static int macb_open(struct net_device *dev)
1892 {
1893 struct macb *bp = netdev_priv(dev);
1894 size_t bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN;
1895 int err;
1896
1897 netdev_dbg(bp->dev, "open\n");
1898
1899 /* carrier starts down */
1900 netif_carrier_off(dev);
1901
1902 /* if the phy is not yet register, retry later*/
1903 if (!bp->phy_dev)
1904 return -EAGAIN;
1905
1906 /* RX buffers initialization */
1907 macb_init_rx_buffer_size(bp, bufsz);
1908
1909 err = macb_alloc_consistent(bp);
1910 if (err) {
1911 netdev_err(dev, "Unable to allocate DMA memory (error %d)\n",
1912 err);
1913 return err;
1914 }
1915
1916 napi_enable(&bp->napi);
1917
1918 bp->macbgem_ops.mog_init_rings(bp);
1919 macb_init_hw(bp);
1920
1921 /* schedule a link state check */
1922 phy_start(bp->phy_dev);
1923
1924 netif_tx_start_all_queues(dev);
1925
1926 return 0;
1927 }
1928
1929 static int macb_close(struct net_device *dev)
1930 {
1931 struct macb *bp = netdev_priv(dev);
1932 unsigned long flags;
1933
1934 netif_tx_stop_all_queues(dev);
1935 napi_disable(&bp->napi);
1936
1937 if (bp->phy_dev)
1938 phy_stop(bp->phy_dev);
1939
1940 spin_lock_irqsave(&bp->lock, flags);
1941 macb_reset_hw(bp);
1942 netif_carrier_off(dev);
1943 spin_unlock_irqrestore(&bp->lock, flags);
1944
1945 macb_free_consistent(bp);
1946
1947 return 0;
1948 }
1949
1950 static int macb_change_mtu(struct net_device *dev, int new_mtu)
1951 {
1952 struct macb *bp = netdev_priv(dev);
1953 u32 max_mtu;
1954
1955 if (netif_running(dev))
1956 return -EBUSY;
1957
1958 max_mtu = ETH_DATA_LEN;
1959 if (bp->caps & MACB_CAPS_JUMBO)
1960 max_mtu = gem_readl(bp, JML) - ETH_HLEN - ETH_FCS_LEN;
1961
1962 if ((new_mtu > max_mtu) || (new_mtu < GEM_MTU_MIN_SIZE))
1963 return -EINVAL;
1964
1965 dev->mtu = new_mtu;
1966
1967 return 0;
1968 }
1969
1970 static void gem_update_stats(struct macb *bp)
1971 {
1972 unsigned int i;
1973 u32 *p = &bp->hw_stats.gem.tx_octets_31_0;
1974
1975 for (i = 0; i < GEM_STATS_LEN; ++i, ++p) {
1976 u32 offset = gem_statistics[i].offset;
1977 u64 val = bp->macb_reg_readl(bp, offset);
1978
1979 bp->ethtool_stats[i] += val;
1980 *p += val;
1981
1982 if (offset == GEM_OCTTXL || offset == GEM_OCTRXL) {
1983 /* Add GEM_OCTTXH, GEM_OCTRXH */
1984 val = bp->macb_reg_readl(bp, offset + 4);
1985 bp->ethtool_stats[i] += ((u64)val) << 32;
1986 *(++p) += val;
1987 }
1988 }
1989 }
1990
1991 static struct net_device_stats *gem_get_stats(struct macb *bp)
1992 {
1993 struct gem_stats *hwstat = &bp->hw_stats.gem;
1994 struct net_device_stats *nstat = &bp->stats;
1995
1996 gem_update_stats(bp);
1997
1998 nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors +
1999 hwstat->rx_alignment_errors +
2000 hwstat->rx_resource_errors +
2001 hwstat->rx_overruns +
2002 hwstat->rx_oversize_frames +
2003 hwstat->rx_jabbers +
2004 hwstat->rx_undersized_frames +
2005 hwstat->rx_length_field_frame_errors);
2006 nstat->tx_errors = (hwstat->tx_late_collisions +
2007 hwstat->tx_excessive_collisions +
2008 hwstat->tx_underrun +
2009 hwstat->tx_carrier_sense_errors);
2010 nstat->multicast = hwstat->rx_multicast_frames;
2011 nstat->collisions = (hwstat->tx_single_collision_frames +
2012 hwstat->tx_multiple_collision_frames +
2013 hwstat->tx_excessive_collisions);
2014 nstat->rx_length_errors = (hwstat->rx_oversize_frames +
2015 hwstat->rx_jabbers +
2016 hwstat->rx_undersized_frames +
2017 hwstat->rx_length_field_frame_errors);
2018 nstat->rx_over_errors = hwstat->rx_resource_errors;
2019 nstat->rx_crc_errors = hwstat->rx_frame_check_sequence_errors;
2020 nstat->rx_frame_errors = hwstat->rx_alignment_errors;
2021 nstat->rx_fifo_errors = hwstat->rx_overruns;
2022 nstat->tx_aborted_errors = hwstat->tx_excessive_collisions;
2023 nstat->tx_carrier_errors = hwstat->tx_carrier_sense_errors;
2024 nstat->tx_fifo_errors = hwstat->tx_underrun;
2025
2026 return nstat;
2027 }
2028
2029 static void gem_get_ethtool_stats(struct net_device *dev,
2030 struct ethtool_stats *stats, u64 *data)
2031 {
2032 struct macb *bp;
2033
2034 bp = netdev_priv(dev);
2035 gem_update_stats(bp);
2036 memcpy(data, &bp->ethtool_stats, sizeof(u64) * GEM_STATS_LEN);
2037 }
2038
2039 static int gem_get_sset_count(struct net_device *dev, int sset)
2040 {
2041 switch (sset) {
2042 case ETH_SS_STATS:
2043 return GEM_STATS_LEN;
2044 default:
2045 return -EOPNOTSUPP;
2046 }
2047 }
2048
2049 static void gem_get_ethtool_strings(struct net_device *dev, u32 sset, u8 *p)
2050 {
2051 unsigned int i;
2052
2053 switch (sset) {
2054 case ETH_SS_STATS:
2055 for (i = 0; i < GEM_STATS_LEN; i++, p += ETH_GSTRING_LEN)
2056 memcpy(p, gem_statistics[i].stat_string,
2057 ETH_GSTRING_LEN);
2058 break;
2059 }
2060 }
2061
2062 static struct net_device_stats *macb_get_stats(struct net_device *dev)
2063 {
2064 struct macb *bp = netdev_priv(dev);
2065 struct net_device_stats *nstat = &bp->stats;
2066 struct macb_stats *hwstat = &bp->hw_stats.macb;
2067
2068 if (macb_is_gem(bp))
2069 return gem_get_stats(bp);
2070
2071 /* read stats from hardware */
2072 macb_update_stats(bp);
2073
2074 /* Convert HW stats into netdevice stats */
2075 nstat->rx_errors = (hwstat->rx_fcs_errors +
2076 hwstat->rx_align_errors +
2077 hwstat->rx_resource_errors +
2078 hwstat->rx_overruns +
2079 hwstat->rx_oversize_pkts +
2080 hwstat->rx_jabbers +
2081 hwstat->rx_undersize_pkts +
2082 hwstat->rx_length_mismatch);
2083 nstat->tx_errors = (hwstat->tx_late_cols +
2084 hwstat->tx_excessive_cols +
2085 hwstat->tx_underruns +
2086 hwstat->tx_carrier_errors +
2087 hwstat->sqe_test_errors);
2088 nstat->collisions = (hwstat->tx_single_cols +
2089 hwstat->tx_multiple_cols +
2090 hwstat->tx_excessive_cols);
2091 nstat->rx_length_errors = (hwstat->rx_oversize_pkts +
2092 hwstat->rx_jabbers +
2093 hwstat->rx_undersize_pkts +
2094 hwstat->rx_length_mismatch);
2095 nstat->rx_over_errors = hwstat->rx_resource_errors +
2096 hwstat->rx_overruns;
2097 nstat->rx_crc_errors = hwstat->rx_fcs_errors;
2098 nstat->rx_frame_errors = hwstat->rx_align_errors;
2099 nstat->rx_fifo_errors = hwstat->rx_overruns;
2100 /* XXX: What does "missed" mean? */
2101 nstat->tx_aborted_errors = hwstat->tx_excessive_cols;
2102 nstat->tx_carrier_errors = hwstat->tx_carrier_errors;
2103 nstat->tx_fifo_errors = hwstat->tx_underruns;
2104 /* Don't know about heartbeat or window errors... */
2105
2106 return nstat;
2107 }
2108
2109 static int macb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
2110 {
2111 struct macb *bp = netdev_priv(dev);
2112 struct phy_device *phydev = bp->phy_dev;
2113
2114 if (!phydev)
2115 return -ENODEV;
2116
2117 return phy_ethtool_gset(phydev, cmd);
2118 }
2119
2120 static int macb_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
2121 {
2122 struct macb *bp = netdev_priv(dev);
2123 struct phy_device *phydev = bp->phy_dev;
2124
2125 if (!phydev)
2126 return -ENODEV;
2127
2128 return phy_ethtool_sset(phydev, cmd);
2129 }
2130
2131 static int macb_get_regs_len(struct net_device *netdev)
2132 {
2133 return MACB_GREGS_NBR * sizeof(u32);
2134 }
2135
2136 static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs,
2137 void *p)
2138 {
2139 struct macb *bp = netdev_priv(dev);
2140 unsigned int tail, head;
2141 u32 *regs_buff = p;
2142
2143 regs->version = (macb_readl(bp, MID) & ((1 << MACB_REV_SIZE) - 1))
2144 | MACB_GREGS_VERSION;
2145
2146 tail = macb_tx_ring_wrap(bp->queues[0].tx_tail);
2147 head = macb_tx_ring_wrap(bp->queues[0].tx_head);
2148
2149 regs_buff[0] = macb_readl(bp, NCR);
2150 regs_buff[1] = macb_or_gem_readl(bp, NCFGR);
2151 regs_buff[2] = macb_readl(bp, NSR);
2152 regs_buff[3] = macb_readl(bp, TSR);
2153 regs_buff[4] = macb_readl(bp, RBQP);
2154 regs_buff[5] = macb_readl(bp, TBQP);
2155 regs_buff[6] = macb_readl(bp, RSR);
2156 regs_buff[7] = macb_readl(bp, IMR);
2157
2158 regs_buff[8] = tail;
2159 regs_buff[9] = head;
2160 regs_buff[10] = macb_tx_dma(&bp->queues[0], tail);
2161 regs_buff[11] = macb_tx_dma(&bp->queues[0], head);
2162
2163 if (!(bp->caps & MACB_CAPS_USRIO_DISABLED))
2164 regs_buff[12] = macb_or_gem_readl(bp, USRIO);
2165 if (macb_is_gem(bp)) {
2166 regs_buff[13] = gem_readl(bp, DMACFG);
2167 }
2168 }
2169
2170 static void macb_get_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
2171 {
2172 struct macb *bp = netdev_priv(netdev);
2173
2174 wol->supported = 0;
2175 wol->wolopts = 0;
2176
2177 if (bp->wol & MACB_WOL_HAS_MAGIC_PACKET) {
2178 wol->supported = WAKE_MAGIC;
2179
2180 if (bp->wol & MACB_WOL_ENABLED)
2181 wol->wolopts |= WAKE_MAGIC;
2182 }
2183 }
2184
2185 static int macb_set_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
2186 {
2187 struct macb *bp = netdev_priv(netdev);
2188
2189 if (!(bp->wol & MACB_WOL_HAS_MAGIC_PACKET) ||
2190 (wol->wolopts & ~WAKE_MAGIC))
2191 return -EOPNOTSUPP;
2192
2193 if (wol->wolopts & WAKE_MAGIC)
2194 bp->wol |= MACB_WOL_ENABLED;
2195 else
2196 bp->wol &= ~MACB_WOL_ENABLED;
2197
2198 device_set_wakeup_enable(&bp->pdev->dev, bp->wol & MACB_WOL_ENABLED);
2199
2200 return 0;
2201 }
2202
2203 static const struct ethtool_ops macb_ethtool_ops = {
2204 .get_settings = macb_get_settings,
2205 .set_settings = macb_set_settings,
2206 .get_regs_len = macb_get_regs_len,
2207 .get_regs = macb_get_regs,
2208 .get_link = ethtool_op_get_link,
2209 .get_ts_info = ethtool_op_get_ts_info,
2210 .get_wol = macb_get_wol,
2211 .set_wol = macb_set_wol,
2212 };
2213
2214 static const struct ethtool_ops gem_ethtool_ops = {
2215 .get_settings = macb_get_settings,
2216 .set_settings = macb_set_settings,
2217 .get_regs_len = macb_get_regs_len,
2218 .get_regs = macb_get_regs,
2219 .get_link = ethtool_op_get_link,
2220 .get_ts_info = ethtool_op_get_ts_info,
2221 .get_ethtool_stats = gem_get_ethtool_stats,
2222 .get_strings = gem_get_ethtool_strings,
2223 .get_sset_count = gem_get_sset_count,
2224 };
2225
2226 static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
2227 {
2228 struct macb *bp = netdev_priv(dev);
2229 struct phy_device *phydev = bp->phy_dev;
2230
2231 if (!netif_running(dev))
2232 return -EINVAL;
2233
2234 if (!phydev)
2235 return -ENODEV;
2236
2237 return phy_mii_ioctl(phydev, rq, cmd);
2238 }
2239
2240 static int macb_set_features(struct net_device *netdev,
2241 netdev_features_t features)
2242 {
2243 struct macb *bp = netdev_priv(netdev);
2244 netdev_features_t changed = features ^ netdev->features;
2245
2246 /* TX checksum offload */
2247 if ((changed & NETIF_F_HW_CSUM) && macb_is_gem(bp)) {
2248 u32 dmacfg;
2249
2250 dmacfg = gem_readl(bp, DMACFG);
2251 if (features & NETIF_F_HW_CSUM)
2252 dmacfg |= GEM_BIT(TXCOEN);
2253 else
2254 dmacfg &= ~GEM_BIT(TXCOEN);
2255 gem_writel(bp, DMACFG, dmacfg);
2256 }
2257
2258 /* RX checksum offload */
2259 if ((changed & NETIF_F_RXCSUM) && macb_is_gem(bp)) {
2260 u32 netcfg;
2261
2262 netcfg = gem_readl(bp, NCFGR);
2263 if (features & NETIF_F_RXCSUM &&
2264 !(netdev->flags & IFF_PROMISC))
2265 netcfg |= GEM_BIT(RXCOEN);
2266 else
2267 netcfg &= ~GEM_BIT(RXCOEN);
2268 gem_writel(bp, NCFGR, netcfg);
2269 }
2270
2271 return 0;
2272 }
2273
2274 static const struct net_device_ops macb_netdev_ops = {
2275 .ndo_open = macb_open,
2276 .ndo_stop = macb_close,
2277 .ndo_start_xmit = macb_start_xmit,
2278 .ndo_set_rx_mode = macb_set_rx_mode,
2279 .ndo_get_stats = macb_get_stats,
2280 .ndo_do_ioctl = macb_ioctl,
2281 .ndo_validate_addr = eth_validate_addr,
2282 .ndo_change_mtu = macb_change_mtu,
2283 .ndo_set_mac_address = eth_mac_addr,
2284 #ifdef CONFIG_NET_POLL_CONTROLLER
2285 .ndo_poll_controller = macb_poll_controller,
2286 #endif
2287 .ndo_set_features = macb_set_features,
2288 };
2289
2290 /*
2291 * Configure peripheral capabilities according to device tree
2292 * and integration options used
2293 */
2294 static void macb_configure_caps(struct macb *bp, const struct macb_config *dt_conf)
2295 {
2296 u32 dcfg;
2297
2298 if (dt_conf)
2299 bp->caps = dt_conf->caps;
2300
2301 if (hw_is_gem(bp->regs, bp->native_io)) {
2302 bp->caps |= MACB_CAPS_MACB_IS_GEM;
2303
2304 dcfg = gem_readl(bp, DCFG1);
2305 if (GEM_BFEXT(IRQCOR, dcfg) == 0)
2306 bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE;
2307 dcfg = gem_readl(bp, DCFG2);
2308 if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0)
2309 bp->caps |= MACB_CAPS_FIFO_MODE;
2310 }
2311
2312 dev_dbg(&bp->pdev->dev, "Cadence caps 0x%08x\n", bp->caps);
2313 }
2314
2315 static void macb_probe_queues(void __iomem *mem,
2316 bool native_io,
2317 unsigned int *queue_mask,
2318 unsigned int *num_queues)
2319 {
2320 unsigned int hw_q;
2321
2322 *queue_mask = 0x1;
2323 *num_queues = 1;
2324
2325 /* is it macb or gem ?
2326 *
2327 * We need to read directly from the hardware here because
2328 * we are early in the probe process and don't have the
2329 * MACB_CAPS_MACB_IS_GEM flag positioned
2330 */
2331 if (!hw_is_gem(mem, native_io))
2332 return;
2333
2334 /* bit 0 is never set but queue 0 always exists */
2335 *queue_mask = readl_relaxed(mem + GEM_DCFG6) & 0xff;
2336
2337 *queue_mask |= 0x1;
2338
2339 for (hw_q = 1; hw_q < MACB_MAX_QUEUES; ++hw_q)
2340 if (*queue_mask & (1 << hw_q))
2341 (*num_queues)++;
2342 }
2343
2344 static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
2345 struct clk **hclk, struct clk **tx_clk)
2346 {
2347 int err;
2348
2349 *pclk = devm_clk_get(&pdev->dev, "pclk");
2350 if (IS_ERR(*pclk)) {
2351 err = PTR_ERR(*pclk);
2352 dev_err(&pdev->dev, "failed to get macb_clk (%u)\n", err);
2353 return err;
2354 }
2355
2356 *hclk = devm_clk_get(&pdev->dev, "hclk");
2357 if (IS_ERR(*hclk)) {
2358 err = PTR_ERR(*hclk);
2359 dev_err(&pdev->dev, "failed to get hclk (%u)\n", err);
2360 return err;
2361 }
2362
2363 *tx_clk = devm_clk_get(&pdev->dev, "tx_clk");
2364 if (IS_ERR(*tx_clk))
2365 *tx_clk = NULL;
2366
2367 err = clk_prepare_enable(*pclk);
2368 if (err) {
2369 dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err);
2370 return err;
2371 }
2372
2373 err = clk_prepare_enable(*hclk);
2374 if (err) {
2375 dev_err(&pdev->dev, "failed to enable hclk (%u)\n", err);
2376 goto err_disable_pclk;
2377 }
2378
2379 err = clk_prepare_enable(*tx_clk);
2380 if (err) {
2381 dev_err(&pdev->dev, "failed to enable tx_clk (%u)\n", err);
2382 goto err_disable_hclk;
2383 }
2384
2385 return 0;
2386
2387 err_disable_hclk:
2388 clk_disable_unprepare(*hclk);
2389
2390 err_disable_pclk:
2391 clk_disable_unprepare(*pclk);
2392
2393 return err;
2394 }
2395
2396 static int macb_init(struct platform_device *pdev)
2397 {
2398 struct net_device *dev = platform_get_drvdata(pdev);
2399 unsigned int hw_q, q;
2400 struct macb *bp = netdev_priv(dev);
2401 struct macb_queue *queue;
2402 int err;
2403 u32 val;
2404
2405 /* set the queue register mapping once for all: queue0 has a special
2406 * register mapping but we don't want to test the queue index then
2407 * compute the corresponding register offset at run time.
2408 */
2409 for (hw_q = 0, q = 0; hw_q < MACB_MAX_QUEUES; ++hw_q) {
2410 if (!(bp->queue_mask & (1 << hw_q)))
2411 continue;
2412
2413 queue = &bp->queues[q];
2414 queue->bp = bp;
2415 if (hw_q) {
2416 queue->ISR = GEM_ISR(hw_q - 1);
2417 queue->IER = GEM_IER(hw_q - 1);
2418 queue->IDR = GEM_IDR(hw_q - 1);
2419 queue->IMR = GEM_IMR(hw_q - 1);
2420 queue->TBQP = GEM_TBQP(hw_q - 1);
2421 } else {
2422 /* queue0 uses legacy registers */
2423 queue->ISR = MACB_ISR;
2424 queue->IER = MACB_IER;
2425 queue->IDR = MACB_IDR;
2426 queue->IMR = MACB_IMR;
2427 queue->TBQP = MACB_TBQP;
2428 }
2429
2430 /* get irq: here we use the linux queue index, not the hardware
2431 * queue index. the queue irq definitions in the device tree
2432 * must remove the optional gaps that could exist in the
2433 * hardware queue mask.
2434 */
2435 queue->irq = platform_get_irq(pdev, q);
2436 err = devm_request_irq(&pdev->dev, queue->irq, macb_interrupt,
2437 IRQF_SHARED, dev->name, queue);
2438 if (err) {
2439 dev_err(&pdev->dev,
2440 "Unable to request IRQ %d (error %d)\n",
2441 queue->irq, err);
2442 return err;
2443 }
2444
2445 INIT_WORK(&queue->tx_error_task, macb_tx_error_task);
2446 q++;
2447 }
2448
2449 dev->netdev_ops = &macb_netdev_ops;
2450 netif_napi_add(dev, &bp->napi, macb_poll, 64);
2451
2452 /* setup appropriated routines according to adapter type */
2453 if (macb_is_gem(bp)) {
2454 bp->max_tx_length = GEM_MAX_TX_LEN;
2455 bp->macbgem_ops.mog_alloc_rx_buffers = gem_alloc_rx_buffers;
2456 bp->macbgem_ops.mog_free_rx_buffers = gem_free_rx_buffers;
2457 bp->macbgem_ops.mog_init_rings = gem_init_rings;
2458 bp->macbgem_ops.mog_rx = gem_rx;
2459 dev->ethtool_ops = &gem_ethtool_ops;
2460 } else {
2461 bp->max_tx_length = MACB_MAX_TX_LEN;
2462 bp->macbgem_ops.mog_alloc_rx_buffers = macb_alloc_rx_buffers;
2463 bp->macbgem_ops.mog_free_rx_buffers = macb_free_rx_buffers;
2464 bp->macbgem_ops.mog_init_rings = macb_init_rings;
2465 bp->macbgem_ops.mog_rx = macb_rx;
2466 dev->ethtool_ops = &macb_ethtool_ops;
2467 }
2468
2469 /* Set features */
2470 dev->hw_features = NETIF_F_SG;
2471 /* Checksum offload is only available on gem with packet buffer */
2472 if (macb_is_gem(bp) && !(bp->caps & MACB_CAPS_FIFO_MODE))
2473 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2474 if (bp->caps & MACB_CAPS_SG_DISABLED)
2475 dev->hw_features &= ~NETIF_F_SG;
2476 dev->features = dev->hw_features;
2477
2478 if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) {
2479 val = 0;
2480 if (bp->phy_interface == PHY_INTERFACE_MODE_RGMII)
2481 val = GEM_BIT(RGMII);
2482 else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII &&
2483 (bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII))
2484 val = MACB_BIT(RMII);
2485 else if (!(bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII))
2486 val = MACB_BIT(MII);
2487
2488 if (bp->caps & MACB_CAPS_USRIO_HAS_CLKEN)
2489 val |= MACB_BIT(CLKEN);
2490
2491 macb_or_gem_writel(bp, USRIO, val);
2492 }
2493
2494 /* Set MII management clock divider */
2495 val = macb_mdc_clk_div(bp);
2496 val |= macb_dbw(bp);
2497 if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII)
2498 val |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL);
2499 macb_writel(bp, NCFGR, val);
2500
2501 return 0;
2502 }
2503
2504 #if defined(CONFIG_OF)
2505 /* 1518 rounded up */
2506 #define AT91ETHER_MAX_RBUFF_SZ 0x600
2507 /* max number of receive buffers */
2508 #define AT91ETHER_MAX_RX_DESCR 9
2509
2510 /* Initialize and start the Receiver and Transmit subsystems */
2511 static int at91ether_start(struct net_device *dev)
2512 {
2513 struct macb *lp = netdev_priv(dev);
2514 dma_addr_t addr;
2515 u32 ctl;
2516 int i;
2517
2518 lp->rx_ring = dma_alloc_coherent(&lp->pdev->dev,
2519 (AT91ETHER_MAX_RX_DESCR *
2520 sizeof(struct macb_dma_desc)),
2521 &lp->rx_ring_dma, GFP_KERNEL);
2522 if (!lp->rx_ring)
2523 return -ENOMEM;
2524
2525 lp->rx_buffers = dma_alloc_coherent(&lp->pdev->dev,
2526 AT91ETHER_MAX_RX_DESCR *
2527 AT91ETHER_MAX_RBUFF_SZ,
2528 &lp->rx_buffers_dma, GFP_KERNEL);
2529 if (!lp->rx_buffers) {
2530 dma_free_coherent(&lp->pdev->dev,
2531 AT91ETHER_MAX_RX_DESCR *
2532 sizeof(struct macb_dma_desc),
2533 lp->rx_ring, lp->rx_ring_dma);
2534 lp->rx_ring = NULL;
2535 return -ENOMEM;
2536 }
2537
2538 addr = lp->rx_buffers_dma;
2539 for (i = 0; i < AT91ETHER_MAX_RX_DESCR; i++) {
2540 lp->rx_ring[i].addr = addr;
2541 lp->rx_ring[i].ctrl = 0;
2542 addr += AT91ETHER_MAX_RBUFF_SZ;
2543 }
2544
2545 /* Set the Wrap bit on the last descriptor */
2546 lp->rx_ring[AT91ETHER_MAX_RX_DESCR - 1].addr |= MACB_BIT(RX_WRAP);
2547
2548 /* Reset buffer index */
2549 lp->rx_tail = 0;
2550
2551 /* Program address of descriptor list in Rx Buffer Queue register */
2552 macb_writel(lp, RBQP, lp->rx_ring_dma);
2553
2554 /* Enable Receive and Transmit */
2555 ctl = macb_readl(lp, NCR);
2556 macb_writel(lp, NCR, ctl | MACB_BIT(RE) | MACB_BIT(TE));
2557
2558 return 0;
2559 }
2560
2561 /* Open the ethernet interface */
2562 static int at91ether_open(struct net_device *dev)
2563 {
2564 struct macb *lp = netdev_priv(dev);
2565 u32 ctl;
2566 int ret;
2567
2568 /* Clear internal statistics */
2569 ctl = macb_readl(lp, NCR);
2570 macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT));
2571
2572 macb_set_hwaddr(lp);
2573
2574 ret = at91ether_start(dev);
2575 if (ret)
2576 return ret;
2577
2578 /* Enable MAC interrupts */
2579 macb_writel(lp, IER, MACB_BIT(RCOMP) |
2580 MACB_BIT(RXUBR) |
2581 MACB_BIT(ISR_TUND) |
2582 MACB_BIT(ISR_RLE) |
2583 MACB_BIT(TCOMP) |
2584 MACB_BIT(ISR_ROVR) |
2585 MACB_BIT(HRESP));
2586
2587 /* schedule a link state check */
2588 phy_start(lp->phy_dev);
2589
2590 netif_start_queue(dev);
2591
2592 return 0;
2593 }
2594
2595 /* Close the interface */
2596 static int at91ether_close(struct net_device *dev)
2597 {
2598 struct macb *lp = netdev_priv(dev);
2599 u32 ctl;
2600
2601 /* Disable Receiver and Transmitter */
2602 ctl = macb_readl(lp, NCR);
2603 macb_writel(lp, NCR, ctl & ~(MACB_BIT(TE) | MACB_BIT(RE)));
2604
2605 /* Disable MAC interrupts */
2606 macb_writel(lp, IDR, MACB_BIT(RCOMP) |
2607 MACB_BIT(RXUBR) |
2608 MACB_BIT(ISR_TUND) |
2609 MACB_BIT(ISR_RLE) |
2610 MACB_BIT(TCOMP) |
2611 MACB_BIT(ISR_ROVR) |
2612 MACB_BIT(HRESP));
2613
2614 netif_stop_queue(dev);
2615
2616 dma_free_coherent(&lp->pdev->dev,
2617 AT91ETHER_MAX_RX_DESCR *
2618 sizeof(struct macb_dma_desc),
2619 lp->rx_ring, lp->rx_ring_dma);
2620 lp->rx_ring = NULL;
2621
2622 dma_free_coherent(&lp->pdev->dev,
2623 AT91ETHER_MAX_RX_DESCR * AT91ETHER_MAX_RBUFF_SZ,
2624 lp->rx_buffers, lp->rx_buffers_dma);
2625 lp->rx_buffers = NULL;
2626
2627 return 0;
2628 }
2629
2630 /* Transmit packet */
2631 static int at91ether_start_xmit(struct sk_buff *skb, struct net_device *dev)
2632 {
2633 struct macb *lp = netdev_priv(dev);
2634
2635 if (macb_readl(lp, TSR) & MACB_BIT(RM9200_BNQ)) {
2636 netif_stop_queue(dev);
2637
2638 /* Store packet information (to free when Tx completed) */
2639 lp->skb = skb;
2640 lp->skb_length = skb->len;
2641 lp->skb_physaddr = dma_map_single(NULL, skb->data, skb->len,
2642 DMA_TO_DEVICE);
2643
2644 /* Set address of the data in the Transmit Address register */
2645 macb_writel(lp, TAR, lp->skb_physaddr);
2646 /* Set length of the packet in the Transmit Control register */
2647 macb_writel(lp, TCR, skb->len);
2648
2649 } else {
2650 netdev_err(dev, "%s called, but device is busy!\n", __func__);
2651 return NETDEV_TX_BUSY;
2652 }
2653
2654 return NETDEV_TX_OK;
2655 }
2656
2657 /* Extract received frame from buffer descriptors and sent to upper layers.
2658 * (Called from interrupt context)
2659 */
2660 static void at91ether_rx(struct net_device *dev)
2661 {
2662 struct macb *lp = netdev_priv(dev);
2663 unsigned char *p_recv;
2664 struct sk_buff *skb;
2665 unsigned int pktlen;
2666
2667 while (lp->rx_ring[lp->rx_tail].addr & MACB_BIT(RX_USED)) {
2668 p_recv = lp->rx_buffers + lp->rx_tail * AT91ETHER_MAX_RBUFF_SZ;
2669 pktlen = MACB_BF(RX_FRMLEN, lp->rx_ring[lp->rx_tail].ctrl);
2670 skb = netdev_alloc_skb(dev, pktlen + 2);
2671 if (skb) {
2672 skb_reserve(skb, 2);
2673 memcpy(skb_put(skb, pktlen), p_recv, pktlen);
2674
2675 skb->protocol = eth_type_trans(skb, dev);
2676 lp->stats.rx_packets++;
2677 lp->stats.rx_bytes += pktlen;
2678 netif_rx(skb);
2679 } else {
2680 lp->stats.rx_dropped++;
2681 }
2682
2683 if (lp->rx_ring[lp->rx_tail].ctrl & MACB_BIT(RX_MHASH_MATCH))
2684 lp->stats.multicast++;
2685
2686 /* reset ownership bit */
2687 lp->rx_ring[lp->rx_tail].addr &= ~MACB_BIT(RX_USED);
2688
2689 /* wrap after last buffer */
2690 if (lp->rx_tail == AT91ETHER_MAX_RX_DESCR - 1)
2691 lp->rx_tail = 0;
2692 else
2693 lp->rx_tail++;
2694 }
2695 }
2696
2697 /* MAC interrupt handler */
2698 static irqreturn_t at91ether_interrupt(int irq, void *dev_id)
2699 {
2700 struct net_device *dev = dev_id;
2701 struct macb *lp = netdev_priv(dev);
2702 u32 intstatus, ctl;
2703
2704 /* MAC Interrupt Status register indicates what interrupts are pending.
2705 * It is automatically cleared once read.
2706 */
2707 intstatus = macb_readl(lp, ISR);
2708
2709 /* Receive complete */
2710 if (intstatus & MACB_BIT(RCOMP))
2711 at91ether_rx(dev);
2712
2713 /* Transmit complete */
2714 if (intstatus & MACB_BIT(TCOMP)) {
2715 /* The TCOM bit is set even if the transmission failed */
2716 if (intstatus & (MACB_BIT(ISR_TUND) | MACB_BIT(ISR_RLE)))
2717 lp->stats.tx_errors++;
2718
2719 if (lp->skb) {
2720 dev_kfree_skb_irq(lp->skb);
2721 lp->skb = NULL;
2722 dma_unmap_single(NULL, lp->skb_physaddr,
2723 lp->skb_length, DMA_TO_DEVICE);
2724 lp->stats.tx_packets++;
2725 lp->stats.tx_bytes += lp->skb_length;
2726 }
2727 netif_wake_queue(dev);
2728 }
2729
2730 /* Work-around for EMAC Errata section 41.3.1 */
2731 if (intstatus & MACB_BIT(RXUBR)) {
2732 ctl = macb_readl(lp, NCR);
2733 macb_writel(lp, NCR, ctl & ~MACB_BIT(RE));
2734 macb_writel(lp, NCR, ctl | MACB_BIT(RE));
2735 }
2736
2737 if (intstatus & MACB_BIT(ISR_ROVR))
2738 netdev_err(dev, "ROVR error\n");
2739
2740 return IRQ_HANDLED;
2741 }
2742
2743 #ifdef CONFIG_NET_POLL_CONTROLLER
2744 static void at91ether_poll_controller(struct net_device *dev)
2745 {
2746 unsigned long flags;
2747
2748 local_irq_save(flags);
2749 at91ether_interrupt(dev->irq, dev);
2750 local_irq_restore(flags);
2751 }
2752 #endif
2753
2754 static const struct net_device_ops at91ether_netdev_ops = {
2755 .ndo_open = at91ether_open,
2756 .ndo_stop = at91ether_close,
2757 .ndo_start_xmit = at91ether_start_xmit,
2758 .ndo_get_stats = macb_get_stats,
2759 .ndo_set_rx_mode = macb_set_rx_mode,
2760 .ndo_set_mac_address = eth_mac_addr,
2761 .ndo_do_ioctl = macb_ioctl,
2762 .ndo_validate_addr = eth_validate_addr,
2763 .ndo_change_mtu = eth_change_mtu,
2764 #ifdef CONFIG_NET_POLL_CONTROLLER
2765 .ndo_poll_controller = at91ether_poll_controller,
2766 #endif
2767 };
2768
2769 static int at91ether_clk_init(struct platform_device *pdev, struct clk **pclk,
2770 struct clk **hclk, struct clk **tx_clk)
2771 {
2772 int err;
2773
2774 *hclk = NULL;
2775 *tx_clk = NULL;
2776
2777 *pclk = devm_clk_get(&pdev->dev, "ether_clk");
2778 if (IS_ERR(*pclk))
2779 return PTR_ERR(*pclk);
2780
2781 err = clk_prepare_enable(*pclk);
2782 if (err) {
2783 dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err);
2784 return err;
2785 }
2786
2787 return 0;
2788 }
2789
2790 static int at91ether_init(struct platform_device *pdev)
2791 {
2792 struct net_device *dev = platform_get_drvdata(pdev);
2793 struct macb *bp = netdev_priv(dev);
2794 int err;
2795 u32 reg;
2796
2797 dev->netdev_ops = &at91ether_netdev_ops;
2798 dev->ethtool_ops = &macb_ethtool_ops;
2799
2800 err = devm_request_irq(&pdev->dev, dev->irq, at91ether_interrupt,
2801 0, dev->name, dev);
2802 if (err)
2803 return err;
2804
2805 macb_writel(bp, NCR, 0);
2806
2807 reg = MACB_BF(CLK, MACB_CLK_DIV32) | MACB_BIT(BIG);
2808 if (bp->phy_interface == PHY_INTERFACE_MODE_RMII)
2809 reg |= MACB_BIT(RM9200_RMII);
2810
2811 macb_writel(bp, NCFGR, reg);
2812
2813 return 0;
2814 }
2815
2816 static const struct macb_config at91sam9260_config = {
2817 .caps = MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
2818 .clk_init = macb_clk_init,
2819 .init = macb_init,
2820 };
2821
2822 static const struct macb_config pc302gem_config = {
2823 .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE,
2824 .dma_burst_length = 16,
2825 .clk_init = macb_clk_init,
2826 .init = macb_init,
2827 };
2828
2829 static const struct macb_config sama5d2_config = {
2830 .caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
2831 .dma_burst_length = 16,
2832 .clk_init = macb_clk_init,
2833 .init = macb_init,
2834 };
2835
2836 static const struct macb_config sama5d3_config = {
2837 .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE
2838 | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
2839 .dma_burst_length = 16,
2840 .clk_init = macb_clk_init,
2841 .init = macb_init,
2842 };
2843
2844 static const struct macb_config sama5d4_config = {
2845 .caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
2846 .dma_burst_length = 4,
2847 .clk_init = macb_clk_init,
2848 .init = macb_init,
2849 };
2850
2851 static const struct macb_config emac_config = {
2852 .clk_init = at91ether_clk_init,
2853 .init = at91ether_init,
2854 };
2855
2856 static const struct macb_config np4_config = {
2857 .caps = MACB_CAPS_USRIO_DISABLED,
2858 .clk_init = macb_clk_init,
2859 .init = macb_init,
2860 };
2861
2862 static const struct macb_config zynqmp_config = {
2863 .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO,
2864 .dma_burst_length = 16,
2865 .clk_init = macb_clk_init,
2866 .init = macb_init,
2867 .jumbo_max_len = 10240,
2868 };
2869
2870 static const struct macb_config zynq_config = {
2871 .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_NO_GIGABIT_HALF,
2872 .dma_burst_length = 16,
2873 .clk_init = macb_clk_init,
2874 .init = macb_init,
2875 };
2876
2877 static const struct of_device_id macb_dt_ids[] = {
2878 { .compatible = "cdns,at32ap7000-macb" },
2879 { .compatible = "cdns,at91sam9260-macb", .data = &at91sam9260_config },
2880 { .compatible = "cdns,macb" },
2881 { .compatible = "cdns,np4-macb", .data = &np4_config },
2882 { .compatible = "cdns,pc302-gem", .data = &pc302gem_config },
2883 { .compatible = "cdns,gem", .data = &pc302gem_config },
2884 { .compatible = "atmel,sama5d2-gem", .data = &sama5d2_config },
2885 { .compatible = "atmel,sama5d3-gem", .data = &sama5d3_config },
2886 { .compatible = "atmel,sama5d4-gem", .data = &sama5d4_config },
2887 { .compatible = "cdns,at91rm9200-emac", .data = &emac_config },
2888 { .compatible = "cdns,emac", .data = &emac_config },
2889 { .compatible = "cdns,zynqmp-gem", .data = &zynqmp_config},
2890 { .compatible = "cdns,zynq-gem", .data = &zynq_config },
2891 { /* sentinel */ }
2892 };
2893 MODULE_DEVICE_TABLE(of, macb_dt_ids);
2894 #endif /* CONFIG_OF */
2895
2896 static int macb_probe(struct platform_device *pdev)
2897 {
2898 int (*clk_init)(struct platform_device *, struct clk **,
2899 struct clk **, struct clk **)
2900 = macb_clk_init;
2901 int (*init)(struct platform_device *) = macb_init;
2902 struct device_node *np = pdev->dev.of_node;
2903 struct device_node *phy_node;
2904 const struct macb_config *macb_config = NULL;
2905 struct clk *pclk, *hclk = NULL, *tx_clk = NULL;
2906 unsigned int queue_mask, num_queues;
2907 struct macb_platform_data *pdata;
2908 bool native_io;
2909 struct phy_device *phydev;
2910 struct net_device *dev;
2911 struct resource *regs;
2912 void __iomem *mem;
2913 const char *mac;
2914 struct macb *bp;
2915 int err;
2916
2917 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2918 mem = devm_ioremap_resource(&pdev->dev, regs);
2919 if (IS_ERR(mem))
2920 return PTR_ERR(mem);
2921
2922 if (np) {
2923 const struct of_device_id *match;
2924
2925 match = of_match_node(macb_dt_ids, np);
2926 if (match && match->data) {
2927 macb_config = match->data;
2928 clk_init = macb_config->clk_init;
2929 init = macb_config->init;
2930 }
2931 }
2932
2933 err = clk_init(pdev, &pclk, &hclk, &tx_clk);
2934 if (err)
2935 return err;
2936
2937 native_io = hw_is_native_io(mem);
2938
2939 macb_probe_queues(mem, native_io, &queue_mask, &num_queues);
2940 dev = alloc_etherdev_mq(sizeof(*bp), num_queues);
2941 if (!dev) {
2942 err = -ENOMEM;
2943 goto err_disable_clocks;
2944 }
2945
2946 dev->base_addr = regs->start;
2947
2948 SET_NETDEV_DEV(dev, &pdev->dev);
2949
2950 bp = netdev_priv(dev);
2951 bp->pdev = pdev;
2952 bp->dev = dev;
2953 bp->regs = mem;
2954 bp->native_io = native_io;
2955 if (native_io) {
2956 bp->macb_reg_readl = hw_readl_native;
2957 bp->macb_reg_writel = hw_writel_native;
2958 } else {
2959 bp->macb_reg_readl = hw_readl;
2960 bp->macb_reg_writel = hw_writel;
2961 }
2962 bp->num_queues = num_queues;
2963 bp->queue_mask = queue_mask;
2964 if (macb_config)
2965 bp->dma_burst_length = macb_config->dma_burst_length;
2966 bp->pclk = pclk;
2967 bp->hclk = hclk;
2968 bp->tx_clk = tx_clk;
2969 if (macb_config)
2970 bp->jumbo_max_len = macb_config->jumbo_max_len;
2971
2972 bp->wol = 0;
2973 if (of_get_property(np, "magic-packet", NULL))
2974 bp->wol |= MACB_WOL_HAS_MAGIC_PACKET;
2975 device_init_wakeup(&pdev->dev, bp->wol & MACB_WOL_HAS_MAGIC_PACKET);
2976
2977 spin_lock_init(&bp->lock);
2978
2979 /* setup capabilities */
2980 macb_configure_caps(bp, macb_config);
2981
2982 platform_set_drvdata(pdev, dev);
2983
2984 dev->irq = platform_get_irq(pdev, 0);
2985 if (dev->irq < 0) {
2986 err = dev->irq;
2987 goto err_disable_clocks;
2988 }
2989
2990 mac = of_get_mac_address(np);
2991 if (mac)
2992 memcpy(bp->dev->dev_addr, mac, ETH_ALEN);
2993 else
2994 macb_get_hwaddr(bp);
2995
2996 /* Power up the PHY if there is a GPIO reset */
2997 phy_node = of_get_next_available_child(np, NULL);
2998 if (phy_node) {
2999 int gpio = of_get_named_gpio(phy_node, "reset-gpios", 0);
3000 if (gpio_is_valid(gpio)) {
3001 bp->reset_gpio = gpio_to_desc(gpio);
3002 gpiod_direction_output(bp->reset_gpio, 1);
3003 }
3004 }
3005 of_node_put(phy_node);
3006
3007 err = of_get_phy_mode(np);
3008 if (err < 0) {
3009 pdata = dev_get_platdata(&pdev->dev);
3010 if (pdata && pdata->is_rmii)
3011 bp->phy_interface = PHY_INTERFACE_MODE_RMII;
3012 else
3013 bp->phy_interface = PHY_INTERFACE_MODE_MII;
3014 } else {
3015 bp->phy_interface = err;
3016 }
3017
3018 /* IP specific init */
3019 err = init(pdev);
3020 if (err)
3021 goto err_out_free_netdev;
3022
3023 err = register_netdev(dev);
3024 if (err) {
3025 dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
3026 goto err_out_unregister_netdev;
3027 }
3028
3029 err = macb_mii_init(bp);
3030 if (err)
3031 goto err_out_unregister_netdev;
3032
3033 netif_carrier_off(dev);
3034
3035 netdev_info(dev, "Cadence %s rev 0x%08x at 0x%08lx irq %d (%pM)\n",
3036 macb_is_gem(bp) ? "GEM" : "MACB", macb_readl(bp, MID),
3037 dev->base_addr, dev->irq, dev->dev_addr);
3038
3039 phydev = bp->phy_dev;
3040 phy_attached_info(phydev);
3041
3042 return 0;
3043
3044 err_out_unregister_netdev:
3045 unregister_netdev(dev);
3046
3047 err_out_free_netdev:
3048 free_netdev(dev);
3049
3050 err_disable_clocks:
3051 clk_disable_unprepare(tx_clk);
3052 clk_disable_unprepare(hclk);
3053 clk_disable_unprepare(pclk);
3054
3055 return err;
3056 }
3057
3058 static int macb_remove(struct platform_device *pdev)
3059 {
3060 struct net_device *dev;
3061 struct macb *bp;
3062
3063 dev = platform_get_drvdata(pdev);
3064
3065 if (dev) {
3066 bp = netdev_priv(dev);
3067 if (bp->phy_dev)
3068 phy_disconnect(bp->phy_dev);
3069 mdiobus_unregister(bp->mii_bus);
3070 mdiobus_free(bp->mii_bus);
3071
3072 /* Shutdown the PHY if there is a GPIO reset */
3073 if (bp->reset_gpio)
3074 gpiod_set_value(bp->reset_gpio, 0);
3075
3076 unregister_netdev(dev);
3077 clk_disable_unprepare(bp->tx_clk);
3078 clk_disable_unprepare(bp->hclk);
3079 clk_disable_unprepare(bp->pclk);
3080 free_netdev(dev);
3081 }
3082
3083 return 0;
3084 }
3085
3086 static int __maybe_unused macb_suspend(struct device *dev)
3087 {
3088 struct platform_device *pdev = to_platform_device(dev);
3089 struct net_device *netdev = platform_get_drvdata(pdev);
3090 struct macb *bp = netdev_priv(netdev);
3091
3092 netif_carrier_off(netdev);
3093 netif_device_detach(netdev);
3094
3095 if (bp->wol & MACB_WOL_ENABLED) {
3096 macb_writel(bp, IER, MACB_BIT(WOL));
3097 macb_writel(bp, WOL, MACB_BIT(MAG));
3098 enable_irq_wake(bp->queues[0].irq);
3099 } else {
3100 clk_disable_unprepare(bp->tx_clk);
3101 clk_disable_unprepare(bp->hclk);
3102 clk_disable_unprepare(bp->pclk);
3103 }
3104
3105 return 0;
3106 }
3107
3108 static int __maybe_unused macb_resume(struct device *dev)
3109 {
3110 struct platform_device *pdev = to_platform_device(dev);
3111 struct net_device *netdev = platform_get_drvdata(pdev);
3112 struct macb *bp = netdev_priv(netdev);
3113
3114 if (bp->wol & MACB_WOL_ENABLED) {
3115 macb_writel(bp, IDR, MACB_BIT(WOL));
3116 macb_writel(bp, WOL, 0);
3117 disable_irq_wake(bp->queues[0].irq);
3118 } else {
3119 clk_prepare_enable(bp->pclk);
3120 clk_prepare_enable(bp->hclk);
3121 clk_prepare_enable(bp->tx_clk);
3122 }
3123
3124 netif_device_attach(netdev);
3125
3126 return 0;
3127 }
3128
3129 static SIMPLE_DEV_PM_OPS(macb_pm_ops, macb_suspend, macb_resume);
3130
3131 static struct platform_driver macb_driver = {
3132 .probe = macb_probe,
3133 .remove = macb_remove,
3134 .driver = {
3135 .name = "macb",
3136 .of_match_table = of_match_ptr(macb_dt_ids),
3137 .pm = &macb_pm_ops,
3138 },
3139 };
3140
3141 module_platform_driver(macb_driver);
3142
3143 MODULE_LICENSE("GPL");
3144 MODULE_DESCRIPTION("Cadence MACB/GEM Ethernet driver");
3145 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
3146 MODULE_ALIAS("platform:macb");
Linux kernel - Deliverables
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