1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Cadence MACB/GEM Ethernet Controller driver
4  *
5  * Copyright (C) 2004-2006 Atmel Corporation
6  */
7 
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9 #include <linux/clk.h>
10 #include <linux/clk-provider.h>
11 #include <linux/crc32.h>
12 #include <linux/module.h>
13 #include <linux/moduleparam.h>
14 #include <linux/kernel.h>
15 #include <linux/types.h>
16 #include <linux/circ_buf.h>
17 #include <linux/slab.h>
18 #include <linux/init.h>
19 #include <linux/io.h>
20 #include <linux/gpio.h>
21 #include <linux/gpio/consumer.h>
22 #include <linux/interrupt.h>
23 #include <linux/netdevice.h>
24 #include <linux/etherdevice.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/platform_device.h>
27 #include <linux/phylink.h>
28 #include <linux/of.h>
29 #include <linux/of_gpio.h>
30 #include <linux/of_mdio.h>
31 #include <linux/of_net.h>
32 #include <linux/ip.h>
33 #include <linux/udp.h>
34 #include <linux/tcp.h>
35 #include <linux/iopoll.h>
36 #include <linux/phy/phy.h>
37 #include <linux/pm_runtime.h>
38 #include <linux/ptp_classify.h>
39 #include <linux/reset.h>
40 #include <linux/firmware/xlnx-zynqmp.h>
41 #include "macb.h"
42 
43 /* This structure is only used for MACB on SiFive FU540 devices */
44 struct sifive_fu540_macb_mgmt {
45 	void __iomem *reg;
46 	unsigned long rate;
47 	struct clk_hw hw;
48 };
49 
50 #define MACB_RX_BUFFER_SIZE	128
51 #define RX_BUFFER_MULTIPLE	64  /* bytes */
52 
53 #define DEFAULT_RX_RING_SIZE	512 /* must be power of 2 */
54 #define MIN_RX_RING_SIZE	64
55 #define MAX_RX_RING_SIZE	8192
56 #define RX_RING_BYTES(bp)	(macb_dma_desc_get_size(bp)	\
57 				 * (bp)->rx_ring_size)
58 
59 #define DEFAULT_TX_RING_SIZE	512 /* must be power of 2 */
60 #define MIN_TX_RING_SIZE	64
61 #define MAX_TX_RING_SIZE	4096
62 #define TX_RING_BYTES(bp)	(macb_dma_desc_get_size(bp)	\
63 				 * (bp)->tx_ring_size)
64 
65 /* level of occupied TX descriptors under which we wake up TX process */
66 #define MACB_TX_WAKEUP_THRESH(bp)	(3 * (bp)->tx_ring_size / 4)
67 
68 #define MACB_RX_INT_FLAGS	(MACB_BIT(RCOMP) | MACB_BIT(ISR_ROVR))
69 #define MACB_TX_ERR_FLAGS	(MACB_BIT(ISR_TUND)			\
70 					| MACB_BIT(ISR_RLE)		\
71 					| MACB_BIT(TXERR))
72 #define MACB_TX_INT_FLAGS	(MACB_TX_ERR_FLAGS | MACB_BIT(TCOMP)	\
73 					| MACB_BIT(TXUBR))
74 
75 /* Max length of transmit frame must be a multiple of 8 bytes */
76 #define MACB_TX_LEN_ALIGN	8
77 #define MACB_MAX_TX_LEN		((unsigned int)((1 << MACB_TX_FRMLEN_SIZE) - 1) & ~((unsigned int)(MACB_TX_LEN_ALIGN - 1)))
78 /* Limit maximum TX length as per Cadence TSO errata. This is to avoid a
79  * false amba_error in TX path from the DMA assuming there is not enough
80  * space in the SRAM (16KB) even when there is.
81  */
82 #define GEM_MAX_TX_LEN		(unsigned int)(0x3FC0)
83 
84 #define GEM_MTU_MIN_SIZE	ETH_MIN_MTU
85 #define MACB_NETIF_LSO		NETIF_F_TSO
86 
87 #define MACB_WOL_HAS_MAGIC_PACKET	(0x1 << 0)
88 #define MACB_WOL_ENABLED		(0x1 << 1)
89 
90 #define HS_SPEED_10000M			4
91 #define MACB_SERDES_RATE_10G		1
92 
93 /* Graceful stop timeouts in us. We should allow up to
94  * 1 frame time (10 Mbits/s, full-duplex, ignoring collisions)
95  */
96 #define MACB_HALT_TIMEOUT	14000
97 #define MACB_PM_TIMEOUT  100 /* ms */
98 
99 #define MACB_MDIO_TIMEOUT	1000000 /* in usecs */
100 
101 /* DMA buffer descriptor might be different size
102  * depends on hardware configuration:
103  *
104  * 1. dma address width 32 bits:
105  *    word 1: 32 bit address of Data Buffer
106  *    word 2: control
107  *
108  * 2. dma address width 64 bits:
109  *    word 1: 32 bit address of Data Buffer
110  *    word 2: control
111  *    word 3: upper 32 bit address of Data Buffer
112  *    word 4: unused
113  *
114  * 3. dma address width 32 bits with hardware timestamping:
115  *    word 1: 32 bit address of Data Buffer
116  *    word 2: control
117  *    word 3: timestamp word 1
118  *    word 4: timestamp word 2
119  *
120  * 4. dma address width 64 bits with hardware timestamping:
121  *    word 1: 32 bit address of Data Buffer
122  *    word 2: control
123  *    word 3: upper 32 bit address of Data Buffer
124  *    word 4: unused
125  *    word 5: timestamp word 1
126  *    word 6: timestamp word 2
127  */
macb_dma_desc_get_size(struct macb * bp)128 static unsigned int macb_dma_desc_get_size(struct macb *bp)
129 {
130 #ifdef MACB_EXT_DESC
131 	unsigned int desc_size;
132 
133 	switch (bp->hw_dma_cap) {
134 	case HW_DMA_CAP_64B:
135 		desc_size = sizeof(struct macb_dma_desc)
136 			+ sizeof(struct macb_dma_desc_64);
137 		break;
138 	case HW_DMA_CAP_PTP:
139 		desc_size = sizeof(struct macb_dma_desc)
140 			+ sizeof(struct macb_dma_desc_ptp);
141 		break;
142 	case HW_DMA_CAP_64B_PTP:
143 		desc_size = sizeof(struct macb_dma_desc)
144 			+ sizeof(struct macb_dma_desc_64)
145 			+ sizeof(struct macb_dma_desc_ptp);
146 		break;
147 	default:
148 		desc_size = sizeof(struct macb_dma_desc);
149 	}
150 	return desc_size;
151 #endif
152 	return sizeof(struct macb_dma_desc);
153 }
154 
macb_adj_dma_desc_idx(struct macb * bp,unsigned int desc_idx)155 static unsigned int macb_adj_dma_desc_idx(struct macb *bp, unsigned int desc_idx)
156 {
157 #ifdef MACB_EXT_DESC
158 	switch (bp->hw_dma_cap) {
159 	case HW_DMA_CAP_64B:
160 	case HW_DMA_CAP_PTP:
161 		desc_idx <<= 1;
162 		break;
163 	case HW_DMA_CAP_64B_PTP:
164 		desc_idx *= 3;
165 		break;
166 	default:
167 		break;
168 	}
169 #endif
170 	return desc_idx;
171 }
172 
173 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
macb_64b_desc(struct macb * bp,struct macb_dma_desc * desc)174 static struct macb_dma_desc_64 *macb_64b_desc(struct macb *bp, struct macb_dma_desc *desc)
175 {
176 	return (struct macb_dma_desc_64 *)((void *)desc
177 		+ sizeof(struct macb_dma_desc));
178 }
179 #endif
180 
181 /* Ring buffer accessors */
macb_tx_ring_wrap(struct macb * bp,unsigned int index)182 static unsigned int macb_tx_ring_wrap(struct macb *bp, unsigned int index)
183 {
184 	return index & (bp->tx_ring_size - 1);
185 }
186 
macb_tx_desc(struct macb_queue * queue,unsigned int index)187 static struct macb_dma_desc *macb_tx_desc(struct macb_queue *queue,
188 					  unsigned int index)
189 {
190 	index = macb_tx_ring_wrap(queue->bp, index);
191 	index = macb_adj_dma_desc_idx(queue->bp, index);
192 	return &queue->tx_ring[index];
193 }
194 
macb_tx_skb(struct macb_queue * queue,unsigned int index)195 static struct macb_tx_skb *macb_tx_skb(struct macb_queue *queue,
196 				       unsigned int index)
197 {
198 	return &queue->tx_skb[macb_tx_ring_wrap(queue->bp, index)];
199 }
200 
macb_tx_dma(struct macb_queue * queue,unsigned int index)201 static dma_addr_t macb_tx_dma(struct macb_queue *queue, unsigned int index)
202 {
203 	dma_addr_t offset;
204 
205 	offset = macb_tx_ring_wrap(queue->bp, index) *
206 			macb_dma_desc_get_size(queue->bp);
207 
208 	return queue->tx_ring_dma + offset;
209 }
210 
macb_rx_ring_wrap(struct macb * bp,unsigned int index)211 static unsigned int macb_rx_ring_wrap(struct macb *bp, unsigned int index)
212 {
213 	return index & (bp->rx_ring_size - 1);
214 }
215 
macb_rx_desc(struct macb_queue * queue,unsigned int index)216 static struct macb_dma_desc *macb_rx_desc(struct macb_queue *queue, unsigned int index)
217 {
218 	index = macb_rx_ring_wrap(queue->bp, index);
219 	index = macb_adj_dma_desc_idx(queue->bp, index);
220 	return &queue->rx_ring[index];
221 }
222 
macb_rx_buffer(struct macb_queue * queue,unsigned int index)223 static void *macb_rx_buffer(struct macb_queue *queue, unsigned int index)
224 {
225 	return queue->rx_buffers + queue->bp->rx_buffer_size *
226 	       macb_rx_ring_wrap(queue->bp, index);
227 }
228 
229 /* I/O accessors */
hw_readl_native(struct macb * bp,int offset)230 static u32 hw_readl_native(struct macb *bp, int offset)
231 {
232 	return __raw_readl(bp->regs + offset);
233 }
234 
hw_writel_native(struct macb * bp,int offset,u32 value)235 static void hw_writel_native(struct macb *bp, int offset, u32 value)
236 {
237 	__raw_writel(value, bp->regs + offset);
238 }
239 
hw_readl(struct macb * bp,int offset)240 static u32 hw_readl(struct macb *bp, int offset)
241 {
242 	return readl_relaxed(bp->regs + offset);
243 }
244 
hw_writel(struct macb * bp,int offset,u32 value)245 static void hw_writel(struct macb *bp, int offset, u32 value)
246 {
247 	writel_relaxed(value, bp->regs + offset);
248 }
249 
250 /* Find the CPU endianness by using the loopback bit of NCR register. When the
251  * CPU is in big endian we need to program swapped mode for management
252  * descriptor access.
253  */
hw_is_native_io(void __iomem * addr)254 static bool hw_is_native_io(void __iomem *addr)
255 {
256 	u32 value = MACB_BIT(LLB);
257 
258 	__raw_writel(value, addr + MACB_NCR);
259 	value = __raw_readl(addr + MACB_NCR);
260 
261 	/* Write 0 back to disable everything */
262 	__raw_writel(0, addr + MACB_NCR);
263 
264 	return value == MACB_BIT(LLB);
265 }
266 
hw_is_gem(void __iomem * addr,bool native_io)267 static bool hw_is_gem(void __iomem *addr, bool native_io)
268 {
269 	u32 id;
270 
271 	if (native_io)
272 		id = __raw_readl(addr + MACB_MID);
273 	else
274 		id = readl_relaxed(addr + MACB_MID);
275 
276 	return MACB_BFEXT(IDNUM, id) >= 0x2;
277 }
278 
macb_set_hwaddr(struct macb * bp)279 static void macb_set_hwaddr(struct macb *bp)
280 {
281 	u32 bottom;
282 	u16 top;
283 
284 	bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr));
285 	macb_or_gem_writel(bp, SA1B, bottom);
286 	top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4)));
287 	macb_or_gem_writel(bp, SA1T, top);
288 
289 	if (gem_has_ptp(bp)) {
290 		gem_writel(bp, RXPTPUNI, bottom);
291 		gem_writel(bp, TXPTPUNI, bottom);
292 	}
293 
294 	/* Clear unused address register sets */
295 	macb_or_gem_writel(bp, SA2B, 0);
296 	macb_or_gem_writel(bp, SA2T, 0);
297 	macb_or_gem_writel(bp, SA3B, 0);
298 	macb_or_gem_writel(bp, SA3T, 0);
299 	macb_or_gem_writel(bp, SA4B, 0);
300 	macb_or_gem_writel(bp, SA4T, 0);
301 }
302 
macb_get_hwaddr(struct macb * bp)303 static void macb_get_hwaddr(struct macb *bp)
304 {
305 	u32 bottom;
306 	u16 top;
307 	u8 addr[6];
308 	int i;
309 
310 	/* Check all 4 address register for valid address */
311 	for (i = 0; i < 4; i++) {
312 		bottom = macb_or_gem_readl(bp, SA1B + i * 8);
313 		top = macb_or_gem_readl(bp, SA1T + i * 8);
314 
315 		addr[0] = bottom & 0xff;
316 		addr[1] = (bottom >> 8) & 0xff;
317 		addr[2] = (bottom >> 16) & 0xff;
318 		addr[3] = (bottom >> 24) & 0xff;
319 		addr[4] = top & 0xff;
320 		addr[5] = (top >> 8) & 0xff;
321 
322 		if (is_valid_ether_addr(addr)) {
323 			eth_hw_addr_set(bp->dev, addr);
324 			return;
325 		}
326 	}
327 
328 	dev_info(&bp->pdev->dev, "invalid hw address, using random\n");
329 	eth_hw_addr_random(bp->dev);
330 }
331 
macb_mdio_wait_for_idle(struct macb * bp)332 static int macb_mdio_wait_for_idle(struct macb *bp)
333 {
334 	u32 val;
335 
336 	return readx_poll_timeout(MACB_READ_NSR, bp, val, val & MACB_BIT(IDLE),
337 				  1, MACB_MDIO_TIMEOUT);
338 }
339 
macb_mdio_read_c22(struct mii_bus * bus,int mii_id,int regnum)340 static int macb_mdio_read_c22(struct mii_bus *bus, int mii_id, int regnum)
341 {
342 	struct macb *bp = bus->priv;
343 	int status;
344 
345 	status = pm_runtime_resume_and_get(&bp->pdev->dev);
346 	if (status < 0)
347 		goto mdio_pm_exit;
348 
349 	status = macb_mdio_wait_for_idle(bp);
350 	if (status < 0)
351 		goto mdio_read_exit;
352 
353 	macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C22_SOF)
354 			      | MACB_BF(RW, MACB_MAN_C22_READ)
355 			      | MACB_BF(PHYA, mii_id)
356 			      | MACB_BF(REGA, regnum)
357 			      | MACB_BF(CODE, MACB_MAN_C22_CODE)));
358 
359 	status = macb_mdio_wait_for_idle(bp);
360 	if (status < 0)
361 		goto mdio_read_exit;
362 
363 	status = MACB_BFEXT(DATA, macb_readl(bp, MAN));
364 
365 mdio_read_exit:
366 	pm_runtime_mark_last_busy(&bp->pdev->dev);
367 	pm_runtime_put_autosuspend(&bp->pdev->dev);
368 mdio_pm_exit:
369 	return status;
370 }
371 
macb_mdio_read_c45(struct mii_bus * bus,int mii_id,int devad,int regnum)372 static int macb_mdio_read_c45(struct mii_bus *bus, int mii_id, int devad,
373 			      int regnum)
374 {
375 	struct macb *bp = bus->priv;
376 	int status;
377 
378 	status = pm_runtime_get_sync(&bp->pdev->dev);
379 	if (status < 0) {
380 		pm_runtime_put_noidle(&bp->pdev->dev);
381 		goto mdio_pm_exit;
382 	}
383 
384 	status = macb_mdio_wait_for_idle(bp);
385 	if (status < 0)
386 		goto mdio_read_exit;
387 
388 	macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C45_SOF)
389 			      | MACB_BF(RW, MACB_MAN_C45_ADDR)
390 			      | MACB_BF(PHYA, mii_id)
391 			      | MACB_BF(REGA, devad & 0x1F)
392 			      | MACB_BF(DATA, regnum & 0xFFFF)
393 			      | MACB_BF(CODE, MACB_MAN_C45_CODE)));
394 
395 	status = macb_mdio_wait_for_idle(bp);
396 	if (status < 0)
397 		goto mdio_read_exit;
398 
399 	macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C45_SOF)
400 			      | MACB_BF(RW, MACB_MAN_C45_READ)
401 			      | MACB_BF(PHYA, mii_id)
402 			      | MACB_BF(REGA, devad & 0x1F)
403 			      | MACB_BF(CODE, MACB_MAN_C45_CODE)));
404 
405 	status = macb_mdio_wait_for_idle(bp);
406 	if (status < 0)
407 		goto mdio_read_exit;
408 
409 	status = MACB_BFEXT(DATA, macb_readl(bp, MAN));
410 
411 mdio_read_exit:
412 	pm_runtime_mark_last_busy(&bp->pdev->dev);
413 	pm_runtime_put_autosuspend(&bp->pdev->dev);
414 mdio_pm_exit:
415 	return status;
416 }
417 
macb_mdio_write_c22(struct mii_bus * bus,int mii_id,int regnum,u16 value)418 static int macb_mdio_write_c22(struct mii_bus *bus, int mii_id, int regnum,
419 			       u16 value)
420 {
421 	struct macb *bp = bus->priv;
422 	int status;
423 
424 	status = pm_runtime_resume_and_get(&bp->pdev->dev);
425 	if (status < 0)
426 		goto mdio_pm_exit;
427 
428 	status = macb_mdio_wait_for_idle(bp);
429 	if (status < 0)
430 		goto mdio_write_exit;
431 
432 	macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C22_SOF)
433 			      | MACB_BF(RW, MACB_MAN_C22_WRITE)
434 			      | MACB_BF(PHYA, mii_id)
435 			      | MACB_BF(REGA, regnum)
436 			      | MACB_BF(CODE, MACB_MAN_C22_CODE)
437 			      | MACB_BF(DATA, value)));
438 
439 	status = macb_mdio_wait_for_idle(bp);
440 	if (status < 0)
441 		goto mdio_write_exit;
442 
443 mdio_write_exit:
444 	pm_runtime_mark_last_busy(&bp->pdev->dev);
445 	pm_runtime_put_autosuspend(&bp->pdev->dev);
446 mdio_pm_exit:
447 	return status;
448 }
449 
macb_mdio_write_c45(struct mii_bus * bus,int mii_id,int devad,int regnum,u16 value)450 static int macb_mdio_write_c45(struct mii_bus *bus, int mii_id,
451 			       int devad, int regnum,
452 			       u16 value)
453 {
454 	struct macb *bp = bus->priv;
455 	int status;
456 
457 	status = pm_runtime_get_sync(&bp->pdev->dev);
458 	if (status < 0) {
459 		pm_runtime_put_noidle(&bp->pdev->dev);
460 		goto mdio_pm_exit;
461 	}
462 
463 	status = macb_mdio_wait_for_idle(bp);
464 	if (status < 0)
465 		goto mdio_write_exit;
466 
467 	macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C45_SOF)
468 			      | MACB_BF(RW, MACB_MAN_C45_ADDR)
469 			      | MACB_BF(PHYA, mii_id)
470 			      | MACB_BF(REGA, devad & 0x1F)
471 			      | MACB_BF(DATA, regnum & 0xFFFF)
472 			      | MACB_BF(CODE, MACB_MAN_C45_CODE)));
473 
474 	status = macb_mdio_wait_for_idle(bp);
475 	if (status < 0)
476 		goto mdio_write_exit;
477 
478 	macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C45_SOF)
479 			      | MACB_BF(RW, MACB_MAN_C45_WRITE)
480 			      | MACB_BF(PHYA, mii_id)
481 			      | MACB_BF(REGA, devad & 0x1F)
482 			      | MACB_BF(CODE, MACB_MAN_C45_CODE)
483 			      | MACB_BF(DATA, value)));
484 
485 	status = macb_mdio_wait_for_idle(bp);
486 	if (status < 0)
487 		goto mdio_write_exit;
488 
489 mdio_write_exit:
490 	pm_runtime_mark_last_busy(&bp->pdev->dev);
491 	pm_runtime_put_autosuspend(&bp->pdev->dev);
492 mdio_pm_exit:
493 	return status;
494 }
495 
macb_init_buffers(struct macb * bp)496 static void macb_init_buffers(struct macb *bp)
497 {
498 	struct macb_queue *queue;
499 	unsigned int q;
500 
501 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
502 		queue_writel(queue, RBQP, lower_32_bits(queue->rx_ring_dma));
503 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
504 		if (bp->hw_dma_cap & HW_DMA_CAP_64B)
505 			queue_writel(queue, RBQPH,
506 				     upper_32_bits(queue->rx_ring_dma));
507 #endif
508 		queue_writel(queue, TBQP, lower_32_bits(queue->tx_ring_dma));
509 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
510 		if (bp->hw_dma_cap & HW_DMA_CAP_64B)
511 			queue_writel(queue, TBQPH,
512 				     upper_32_bits(queue->tx_ring_dma));
513 #endif
514 	}
515 }
516 
517 /**
518  * macb_set_tx_clk() - Set a clock to a new frequency
519  * @bp:		pointer to struct macb
520  * @speed:	New frequency in Hz
521  */
macb_set_tx_clk(struct macb * bp,int speed)522 static void macb_set_tx_clk(struct macb *bp, int speed)
523 {
524 	long ferr, rate, rate_rounded;
525 
526 	if (!bp->tx_clk || (bp->caps & MACB_CAPS_CLK_HW_CHG))
527 		return;
528 
529 	/* In case of MII the PHY is the clock master */
530 	if (bp->phy_interface == PHY_INTERFACE_MODE_MII)
531 		return;
532 
533 	switch (speed) {
534 	case SPEED_10:
535 		rate = 2500000;
536 		break;
537 	case SPEED_100:
538 		rate = 25000000;
539 		break;
540 	case SPEED_1000:
541 		rate = 125000000;
542 		break;
543 	default:
544 		return;
545 	}
546 
547 	rate_rounded = clk_round_rate(bp->tx_clk, rate);
548 	if (rate_rounded < 0)
549 		return;
550 
551 	/* RGMII allows 50 ppm frequency error. Test and warn if this limit
552 	 * is not satisfied.
553 	 */
554 	ferr = abs(rate_rounded - rate);
555 	ferr = DIV_ROUND_UP(ferr, rate / 100000);
556 	if (ferr > 5)
557 		netdev_warn(bp->dev,
558 			    "unable to generate target frequency: %ld Hz\n",
559 			    rate);
560 
561 	if (clk_set_rate(bp->tx_clk, rate_rounded))
562 		netdev_err(bp->dev, "adjusting tx_clk failed.\n");
563 }
564 
macb_usx_pcs_link_up(struct phylink_pcs * pcs,unsigned int neg_mode,phy_interface_t interface,int speed,int duplex)565 static void macb_usx_pcs_link_up(struct phylink_pcs *pcs, unsigned int neg_mode,
566 				 phy_interface_t interface, int speed,
567 				 int duplex)
568 {
569 	struct macb *bp = container_of(pcs, struct macb, phylink_usx_pcs);
570 	u32 config;
571 
572 	config = gem_readl(bp, USX_CONTROL);
573 	config = GEM_BFINS(SERDES_RATE, MACB_SERDES_RATE_10G, config);
574 	config = GEM_BFINS(USX_CTRL_SPEED, HS_SPEED_10000M, config);
575 	config &= ~(GEM_BIT(TX_SCR_BYPASS) | GEM_BIT(RX_SCR_BYPASS));
576 	config |= GEM_BIT(TX_EN);
577 	gem_writel(bp, USX_CONTROL, config);
578 }
579 
macb_usx_pcs_get_state(struct phylink_pcs * pcs,struct phylink_link_state * state)580 static void macb_usx_pcs_get_state(struct phylink_pcs *pcs,
581 				   struct phylink_link_state *state)
582 {
583 	struct macb *bp = container_of(pcs, struct macb, phylink_usx_pcs);
584 	u32 val;
585 
586 	state->speed = SPEED_10000;
587 	state->duplex = 1;
588 	state->an_complete = 1;
589 
590 	val = gem_readl(bp, USX_STATUS);
591 	state->link = !!(val & GEM_BIT(USX_BLOCK_LOCK));
592 	val = gem_readl(bp, NCFGR);
593 	if (val & GEM_BIT(PAE))
594 		state->pause = MLO_PAUSE_RX;
595 }
596 
macb_usx_pcs_config(struct phylink_pcs * pcs,unsigned int neg_mode,phy_interface_t interface,const unsigned long * advertising,bool permit_pause_to_mac)597 static int macb_usx_pcs_config(struct phylink_pcs *pcs,
598 			       unsigned int neg_mode,
599 			       phy_interface_t interface,
600 			       const unsigned long *advertising,
601 			       bool permit_pause_to_mac)
602 {
603 	struct macb *bp = container_of(pcs, struct macb, phylink_usx_pcs);
604 
605 	gem_writel(bp, USX_CONTROL, gem_readl(bp, USX_CONTROL) |
606 		   GEM_BIT(SIGNAL_OK));
607 
608 	return 0;
609 }
610 
macb_pcs_get_state(struct phylink_pcs * pcs,struct phylink_link_state * state)611 static void macb_pcs_get_state(struct phylink_pcs *pcs,
612 			       struct phylink_link_state *state)
613 {
614 	state->link = 0;
615 }
616 
macb_pcs_an_restart(struct phylink_pcs * pcs)617 static void macb_pcs_an_restart(struct phylink_pcs *pcs)
618 {
619 	/* Not supported */
620 }
621 
macb_pcs_config(struct phylink_pcs * pcs,unsigned int neg_mode,phy_interface_t interface,const unsigned long * advertising,bool permit_pause_to_mac)622 static int macb_pcs_config(struct phylink_pcs *pcs,
623 			   unsigned int neg_mode,
624 			   phy_interface_t interface,
625 			   const unsigned long *advertising,
626 			   bool permit_pause_to_mac)
627 {
628 	return 0;
629 }
630 
631 static const struct phylink_pcs_ops macb_phylink_usx_pcs_ops = {
632 	.pcs_get_state = macb_usx_pcs_get_state,
633 	.pcs_config = macb_usx_pcs_config,
634 	.pcs_link_up = macb_usx_pcs_link_up,
635 };
636 
637 static const struct phylink_pcs_ops macb_phylink_pcs_ops = {
638 	.pcs_get_state = macb_pcs_get_state,
639 	.pcs_an_restart = macb_pcs_an_restart,
640 	.pcs_config = macb_pcs_config,
641 };
642 
macb_mac_config(struct phylink_config * config,unsigned int mode,const struct phylink_link_state * state)643 static void macb_mac_config(struct phylink_config *config, unsigned int mode,
644 			    const struct phylink_link_state *state)
645 {
646 	struct net_device *ndev = to_net_dev(config->dev);
647 	struct macb *bp = netdev_priv(ndev);
648 	unsigned long flags;
649 	u32 old_ctrl, ctrl;
650 	u32 old_ncr, ncr;
651 
652 	spin_lock_irqsave(&bp->lock, flags);
653 
654 	old_ctrl = ctrl = macb_or_gem_readl(bp, NCFGR);
655 	old_ncr = ncr = macb_or_gem_readl(bp, NCR);
656 
657 	if (bp->caps & MACB_CAPS_MACB_IS_EMAC) {
658 		if (state->interface == PHY_INTERFACE_MODE_RMII)
659 			ctrl |= MACB_BIT(RM9200_RMII);
660 	} else if (macb_is_gem(bp)) {
661 		ctrl &= ~(GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL));
662 		ncr &= ~GEM_BIT(ENABLE_HS_MAC);
663 
664 		if (state->interface == PHY_INTERFACE_MODE_SGMII) {
665 			ctrl |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL);
666 		} else if (state->interface == PHY_INTERFACE_MODE_10GBASER) {
667 			ctrl |= GEM_BIT(PCSSEL);
668 			ncr |= GEM_BIT(ENABLE_HS_MAC);
669 		} else if (bp->caps & MACB_CAPS_MIIONRGMII &&
670 			   bp->phy_interface == PHY_INTERFACE_MODE_MII) {
671 			ncr |= MACB_BIT(MIIONRGMII);
672 		}
673 	}
674 
675 	/* Apply the new configuration, if any */
676 	if (old_ctrl ^ ctrl)
677 		macb_or_gem_writel(bp, NCFGR, ctrl);
678 
679 	if (old_ncr ^ ncr)
680 		macb_or_gem_writel(bp, NCR, ncr);
681 
682 	/* Disable AN for SGMII fixed link configuration, enable otherwise.
683 	 * Must be written after PCSSEL is set in NCFGR,
684 	 * otherwise writes will not take effect.
685 	 */
686 	if (macb_is_gem(bp) && state->interface == PHY_INTERFACE_MODE_SGMII) {
687 		u32 pcsctrl, old_pcsctrl;
688 
689 		old_pcsctrl = gem_readl(bp, PCSCNTRL);
690 		if (mode == MLO_AN_FIXED)
691 			pcsctrl = old_pcsctrl & ~GEM_BIT(PCSAUTONEG);
692 		else
693 			pcsctrl = old_pcsctrl | GEM_BIT(PCSAUTONEG);
694 		if (old_pcsctrl != pcsctrl)
695 			gem_writel(bp, PCSCNTRL, pcsctrl);
696 	}
697 
698 	spin_unlock_irqrestore(&bp->lock, flags);
699 }
700 
macb_mac_link_down(struct phylink_config * config,unsigned int mode,phy_interface_t interface)701 static void macb_mac_link_down(struct phylink_config *config, unsigned int mode,
702 			       phy_interface_t interface)
703 {
704 	struct net_device *ndev = to_net_dev(config->dev);
705 	struct macb *bp = netdev_priv(ndev);
706 	struct macb_queue *queue;
707 	unsigned int q;
708 	u32 ctrl;
709 
710 	if (!(bp->caps & MACB_CAPS_MACB_IS_EMAC))
711 		for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
712 			queue_writel(queue, IDR,
713 				     bp->rx_intr_mask | MACB_TX_INT_FLAGS | MACB_BIT(HRESP));
714 
715 	/* Disable Rx and Tx */
716 	ctrl = macb_readl(bp, NCR) & ~(MACB_BIT(RE) | MACB_BIT(TE));
717 	macb_writel(bp, NCR, ctrl);
718 
719 	netif_tx_stop_all_queues(ndev);
720 }
721 
macb_mac_link_up(struct phylink_config * config,struct phy_device * phy,unsigned int mode,phy_interface_t interface,int speed,int duplex,bool tx_pause,bool rx_pause)722 static void macb_mac_link_up(struct phylink_config *config,
723 			     struct phy_device *phy,
724 			     unsigned int mode, phy_interface_t interface,
725 			     int speed, int duplex,
726 			     bool tx_pause, bool rx_pause)
727 {
728 	struct net_device *ndev = to_net_dev(config->dev);
729 	struct macb *bp = netdev_priv(ndev);
730 	struct macb_queue *queue;
731 	unsigned long flags;
732 	unsigned int q;
733 	u32 ctrl;
734 
735 	spin_lock_irqsave(&bp->lock, flags);
736 
737 	ctrl = macb_or_gem_readl(bp, NCFGR);
738 
739 	ctrl &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
740 
741 	if (speed == SPEED_100)
742 		ctrl |= MACB_BIT(SPD);
743 
744 	if (duplex)
745 		ctrl |= MACB_BIT(FD);
746 
747 	if (!(bp->caps & MACB_CAPS_MACB_IS_EMAC)) {
748 		ctrl &= ~MACB_BIT(PAE);
749 		if (macb_is_gem(bp)) {
750 			ctrl &= ~GEM_BIT(GBE);
751 
752 			if (speed == SPEED_1000)
753 				ctrl |= GEM_BIT(GBE);
754 		}
755 
756 		if (rx_pause)
757 			ctrl |= MACB_BIT(PAE);
758 
759 		/* Initialize rings & buffers as clearing MACB_BIT(TE) in link down
760 		 * cleared the pipeline and control registers.
761 		 */
762 		bp->macbgem_ops.mog_init_rings(bp);
763 		macb_init_buffers(bp);
764 
765 		for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
766 			queue_writel(queue, IER,
767 				     bp->rx_intr_mask | MACB_TX_INT_FLAGS | MACB_BIT(HRESP));
768 	}
769 
770 	macb_or_gem_writel(bp, NCFGR, ctrl);
771 
772 	if (bp->phy_interface == PHY_INTERFACE_MODE_10GBASER)
773 		gem_writel(bp, HS_MAC_CONFIG, GEM_BFINS(HS_MAC_SPEED, HS_SPEED_10000M,
774 							gem_readl(bp, HS_MAC_CONFIG)));
775 
776 	spin_unlock_irqrestore(&bp->lock, flags);
777 
778 	if (!(bp->caps & MACB_CAPS_MACB_IS_EMAC))
779 		macb_set_tx_clk(bp, speed);
780 
781 	/* Enable Rx and Tx; Enable PTP unicast */
782 	ctrl = macb_readl(bp, NCR);
783 	if (gem_has_ptp(bp))
784 		ctrl |= MACB_BIT(PTPUNI);
785 
786 	macb_writel(bp, NCR, ctrl | MACB_BIT(RE) | MACB_BIT(TE));
787 
788 	netif_tx_wake_all_queues(ndev);
789 }
790 
macb_mac_select_pcs(struct phylink_config * config,phy_interface_t interface)791 static struct phylink_pcs *macb_mac_select_pcs(struct phylink_config *config,
792 					       phy_interface_t interface)
793 {
794 	struct net_device *ndev = to_net_dev(config->dev);
795 	struct macb *bp = netdev_priv(ndev);
796 
797 	if (interface == PHY_INTERFACE_MODE_10GBASER)
798 		return &bp->phylink_usx_pcs;
799 	else if (interface == PHY_INTERFACE_MODE_SGMII)
800 		return &bp->phylink_sgmii_pcs;
801 	else
802 		return NULL;
803 }
804 
805 static const struct phylink_mac_ops macb_phylink_ops = {
806 	.mac_select_pcs = macb_mac_select_pcs,
807 	.mac_config = macb_mac_config,
808 	.mac_link_down = macb_mac_link_down,
809 	.mac_link_up = macb_mac_link_up,
810 };
811 
macb_phy_handle_exists(struct device_node * dn)812 static bool macb_phy_handle_exists(struct device_node *dn)
813 {
814 	dn = of_parse_phandle(dn, "phy-handle", 0);
815 	of_node_put(dn);
816 	return dn != NULL;
817 }
818 
macb_phylink_connect(struct macb * bp)819 static int macb_phylink_connect(struct macb *bp)
820 {
821 	struct device_node *dn = bp->pdev->dev.of_node;
822 	struct net_device *dev = bp->dev;
823 	struct phy_device *phydev;
824 	int ret;
825 
826 	if (dn)
827 		ret = phylink_of_phy_connect(bp->phylink, dn, 0);
828 
829 	if (!dn || (ret && !macb_phy_handle_exists(dn))) {
830 		phydev = phy_find_first(bp->mii_bus);
831 		if (!phydev) {
832 			netdev_err(dev, "no PHY found\n");
833 			return -ENXIO;
834 		}
835 
836 		/* attach the mac to the phy */
837 		ret = phylink_connect_phy(bp->phylink, phydev);
838 	}
839 
840 	if (ret) {
841 		netdev_err(dev, "Could not attach PHY (%d)\n", ret);
842 		return ret;
843 	}
844 
845 	phylink_start(bp->phylink);
846 
847 	return 0;
848 }
849 
macb_get_pcs_fixed_state(struct phylink_config * config,struct phylink_link_state * state)850 static void macb_get_pcs_fixed_state(struct phylink_config *config,
851 				     struct phylink_link_state *state)
852 {
853 	struct net_device *ndev = to_net_dev(config->dev);
854 	struct macb *bp = netdev_priv(ndev);
855 
856 	state->link = (macb_readl(bp, NSR) & MACB_BIT(NSR_LINK)) != 0;
857 }
858 
859 /* based on au1000_eth. c*/
macb_mii_probe(struct net_device * dev)860 static int macb_mii_probe(struct net_device *dev)
861 {
862 	struct macb *bp = netdev_priv(dev);
863 
864 	bp->phylink_sgmii_pcs.ops = &macb_phylink_pcs_ops;
865 	bp->phylink_sgmii_pcs.neg_mode = true;
866 	bp->phylink_usx_pcs.ops = &macb_phylink_usx_pcs_ops;
867 	bp->phylink_usx_pcs.neg_mode = true;
868 
869 	bp->phylink_config.dev = &dev->dev;
870 	bp->phylink_config.type = PHYLINK_NETDEV;
871 	bp->phylink_config.mac_managed_pm = true;
872 
873 	if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) {
874 		bp->phylink_config.poll_fixed_state = true;
875 		bp->phylink_config.get_fixed_state = macb_get_pcs_fixed_state;
876 	}
877 
878 	bp->phylink_config.mac_capabilities = MAC_ASYM_PAUSE |
879 		MAC_10 | MAC_100;
880 
881 	__set_bit(PHY_INTERFACE_MODE_MII,
882 		  bp->phylink_config.supported_interfaces);
883 	__set_bit(PHY_INTERFACE_MODE_RMII,
884 		  bp->phylink_config.supported_interfaces);
885 
886 	/* Determine what modes are supported */
887 	if (macb_is_gem(bp) && (bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)) {
888 		bp->phylink_config.mac_capabilities |= MAC_1000FD;
889 		if (!(bp->caps & MACB_CAPS_NO_GIGABIT_HALF))
890 			bp->phylink_config.mac_capabilities |= MAC_1000HD;
891 
892 		__set_bit(PHY_INTERFACE_MODE_GMII,
893 			  bp->phylink_config.supported_interfaces);
894 		phy_interface_set_rgmii(bp->phylink_config.supported_interfaces);
895 
896 		if (bp->caps & MACB_CAPS_PCS)
897 			__set_bit(PHY_INTERFACE_MODE_SGMII,
898 				  bp->phylink_config.supported_interfaces);
899 
900 		if (bp->caps & MACB_CAPS_HIGH_SPEED) {
901 			__set_bit(PHY_INTERFACE_MODE_10GBASER,
902 				  bp->phylink_config.supported_interfaces);
903 			bp->phylink_config.mac_capabilities |= MAC_10000FD;
904 		}
905 	}
906 
907 	bp->phylink = phylink_create(&bp->phylink_config, bp->pdev->dev.fwnode,
908 				     bp->phy_interface, &macb_phylink_ops);
909 	if (IS_ERR(bp->phylink)) {
910 		netdev_err(dev, "Could not create a phylink instance (%ld)\n",
911 			   PTR_ERR(bp->phylink));
912 		return PTR_ERR(bp->phylink);
913 	}
914 
915 	return 0;
916 }
917 
macb_mdiobus_register(struct macb * bp)918 static int macb_mdiobus_register(struct macb *bp)
919 {
920 	struct device_node *child, *np = bp->pdev->dev.of_node;
921 
922 	/* If we have a child named mdio, probe it instead of looking for PHYs
923 	 * directly under the MAC node
924 	 */
925 	child = of_get_child_by_name(np, "mdio");
926 	if (child) {
927 		int ret = of_mdiobus_register(bp->mii_bus, child);
928 
929 		of_node_put(child);
930 		return ret;
931 	}
932 
933 	if (of_phy_is_fixed_link(np))
934 		return mdiobus_register(bp->mii_bus);
935 
936 	/* Only create the PHY from the device tree if at least one PHY is
937 	 * described. Otherwise scan the entire MDIO bus. We do this to support
938 	 * old device tree that did not follow the best practices and did not
939 	 * describe their network PHYs.
940 	 */
941 	for_each_available_child_of_node(np, child)
942 		if (of_mdiobus_child_is_phy(child)) {
943 			/* The loop increments the child refcount,
944 			 * decrement it before returning.
945 			 */
946 			of_node_put(child);
947 
948 			return of_mdiobus_register(bp->mii_bus, np);
949 		}
950 
951 	return mdiobus_register(bp->mii_bus);
952 }
953 
macb_mii_init(struct macb * bp)954 static int macb_mii_init(struct macb *bp)
955 {
956 	int err = -ENXIO;
957 
958 	/* Enable management port */
959 	macb_writel(bp, NCR, MACB_BIT(MPE));
960 
961 	bp->mii_bus = mdiobus_alloc();
962 	if (!bp->mii_bus) {
963 		err = -ENOMEM;
964 		goto err_out;
965 	}
966 
967 	bp->mii_bus->name = "MACB_mii_bus";
968 	bp->mii_bus->read = &macb_mdio_read_c22;
969 	bp->mii_bus->write = &macb_mdio_write_c22;
970 	bp->mii_bus->read_c45 = &macb_mdio_read_c45;
971 	bp->mii_bus->write_c45 = &macb_mdio_write_c45;
972 	snprintf(bp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
973 		 bp->pdev->name, bp->pdev->id);
974 	bp->mii_bus->priv = bp;
975 	bp->mii_bus->parent = &bp->pdev->dev;
976 
977 	dev_set_drvdata(&bp->dev->dev, bp->mii_bus);
978 
979 	err = macb_mdiobus_register(bp);
980 	if (err)
981 		goto err_out_free_mdiobus;
982 
983 	err = macb_mii_probe(bp->dev);
984 	if (err)
985 		goto err_out_unregister_bus;
986 
987 	return 0;
988 
989 err_out_unregister_bus:
990 	mdiobus_unregister(bp->mii_bus);
991 err_out_free_mdiobus:
992 	mdiobus_free(bp->mii_bus);
993 err_out:
994 	return err;
995 }
996 
macb_update_stats(struct macb * bp)997 static void macb_update_stats(struct macb *bp)
998 {
999 	u32 *p = &bp->hw_stats.macb.rx_pause_frames;
1000 	u32 *end = &bp->hw_stats.macb.tx_pause_frames + 1;
1001 	int offset = MACB_PFR;
1002 
1003 	WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4);
1004 
1005 	for (; p < end; p++, offset += 4)
1006 		*p += bp->macb_reg_readl(bp, offset);
1007 }
1008 
macb_halt_tx(struct macb * bp)1009 static int macb_halt_tx(struct macb *bp)
1010 {
1011 	unsigned long	halt_time, timeout;
1012 	u32		status;
1013 
1014 	macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(THALT));
1015 
1016 	timeout = jiffies + usecs_to_jiffies(MACB_HALT_TIMEOUT);
1017 	do {
1018 		halt_time = jiffies;
1019 		status = macb_readl(bp, TSR);
1020 		if (!(status & MACB_BIT(TGO)))
1021 			return 0;
1022 
1023 		udelay(250);
1024 	} while (time_before(halt_time, timeout));
1025 
1026 	return -ETIMEDOUT;
1027 }
1028 
macb_tx_unmap(struct macb * bp,struct macb_tx_skb * tx_skb,int budget)1029 static void macb_tx_unmap(struct macb *bp, struct macb_tx_skb *tx_skb, int budget)
1030 {
1031 	if (tx_skb->mapping) {
1032 		if (tx_skb->mapped_as_page)
1033 			dma_unmap_page(&bp->pdev->dev, tx_skb->mapping,
1034 				       tx_skb->size, DMA_TO_DEVICE);
1035 		else
1036 			dma_unmap_single(&bp->pdev->dev, tx_skb->mapping,
1037 					 tx_skb->size, DMA_TO_DEVICE);
1038 		tx_skb->mapping = 0;
1039 	}
1040 
1041 	if (tx_skb->skb) {
1042 		napi_consume_skb(tx_skb->skb, budget);
1043 		tx_skb->skb = NULL;
1044 	}
1045 }
1046 
macb_set_addr(struct macb * bp,struct macb_dma_desc * desc,dma_addr_t addr)1047 static void macb_set_addr(struct macb *bp, struct macb_dma_desc *desc, dma_addr_t addr)
1048 {
1049 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
1050 	struct macb_dma_desc_64 *desc_64;
1051 
1052 	if (bp->hw_dma_cap & HW_DMA_CAP_64B) {
1053 		desc_64 = macb_64b_desc(bp, desc);
1054 		desc_64->addrh = upper_32_bits(addr);
1055 		/* The low bits of RX address contain the RX_USED bit, clearing
1056 		 * of which allows packet RX. Make sure the high bits are also
1057 		 * visible to HW at that point.
1058 		 */
1059 		dma_wmb();
1060 	}
1061 #endif
1062 	desc->addr = lower_32_bits(addr);
1063 }
1064 
macb_get_addr(struct macb * bp,struct macb_dma_desc * desc)1065 static dma_addr_t macb_get_addr(struct macb *bp, struct macb_dma_desc *desc)
1066 {
1067 	dma_addr_t addr = 0;
1068 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
1069 	struct macb_dma_desc_64 *desc_64;
1070 
1071 	if (bp->hw_dma_cap & HW_DMA_CAP_64B) {
1072 		desc_64 = macb_64b_desc(bp, desc);
1073 		addr = ((u64)(desc_64->addrh) << 32);
1074 	}
1075 #endif
1076 	addr |= MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, desc->addr));
1077 #ifdef CONFIG_MACB_USE_HWSTAMP
1078 	if (bp->hw_dma_cap & HW_DMA_CAP_PTP)
1079 		addr &= ~GEM_BIT(DMA_RXVALID);
1080 #endif
1081 	return addr;
1082 }
1083 
macb_tx_error_task(struct work_struct * work)1084 static void macb_tx_error_task(struct work_struct *work)
1085 {
1086 	struct macb_queue	*queue = container_of(work, struct macb_queue,
1087 						      tx_error_task);
1088 	bool			halt_timeout = false;
1089 	struct macb		*bp = queue->bp;
1090 	struct macb_tx_skb	*tx_skb;
1091 	struct macb_dma_desc	*desc;
1092 	struct sk_buff		*skb;
1093 	unsigned int		tail;
1094 	unsigned long		flags;
1095 
1096 	netdev_vdbg(bp->dev, "macb_tx_error_task: q = %u, t = %u, h = %u\n",
1097 		    (unsigned int)(queue - bp->queues),
1098 		    queue->tx_tail, queue->tx_head);
1099 
1100 	/* Prevent the queue NAPI TX poll from running, as it calls
1101 	 * macb_tx_complete(), which in turn may call netif_wake_subqueue().
1102 	 * As explained below, we have to halt the transmission before updating
1103 	 * TBQP registers so we call netif_tx_stop_all_queues() to notify the
1104 	 * network engine about the macb/gem being halted.
1105 	 */
1106 	napi_disable(&queue->napi_tx);
1107 	spin_lock_irqsave(&bp->lock, flags);
1108 
1109 	/* Make sure nobody is trying to queue up new packets */
1110 	netif_tx_stop_all_queues(bp->dev);
1111 
1112 	/* Stop transmission now
1113 	 * (in case we have just queued new packets)
1114 	 * macb/gem must be halted to write TBQP register
1115 	 */
1116 	if (macb_halt_tx(bp)) {
1117 		netdev_err(bp->dev, "BUG: halt tx timed out\n");
1118 		macb_writel(bp, NCR, macb_readl(bp, NCR) & (~MACB_BIT(TE)));
1119 		halt_timeout = true;
1120 	}
1121 
1122 	/* Treat frames in TX queue including the ones that caused the error.
1123 	 * Free transmit buffers in upper layer.
1124 	 */
1125 	for (tail = queue->tx_tail; tail != queue->tx_head; tail++) {
1126 		u32	ctrl;
1127 
1128 		desc = macb_tx_desc(queue, tail);
1129 		ctrl = desc->ctrl;
1130 		tx_skb = macb_tx_skb(queue, tail);
1131 		skb = tx_skb->skb;
1132 
1133 		if (ctrl & MACB_BIT(TX_USED)) {
1134 			/* skb is set for the last buffer of the frame */
1135 			while (!skb) {
1136 				macb_tx_unmap(bp, tx_skb, 0);
1137 				tail++;
1138 				tx_skb = macb_tx_skb(queue, tail);
1139 				skb = tx_skb->skb;
1140 			}
1141 
1142 			/* ctrl still refers to the first buffer descriptor
1143 			 * since it's the only one written back by the hardware
1144 			 */
1145 			if (!(ctrl & MACB_BIT(TX_BUF_EXHAUSTED))) {
1146 				netdev_vdbg(bp->dev, "txerr skb %u (data %p) TX complete\n",
1147 					    macb_tx_ring_wrap(bp, tail),
1148 					    skb->data);
1149 				bp->dev->stats.tx_packets++;
1150 				queue->stats.tx_packets++;
1151 				bp->dev->stats.tx_bytes += skb->len;
1152 				queue->stats.tx_bytes += skb->len;
1153 			}
1154 		} else {
1155 			/* "Buffers exhausted mid-frame" errors may only happen
1156 			 * if the driver is buggy, so complain loudly about
1157 			 * those. Statistics are updated by hardware.
1158 			 */
1159 			if (ctrl & MACB_BIT(TX_BUF_EXHAUSTED))
1160 				netdev_err(bp->dev,
1161 					   "BUG: TX buffers exhausted mid-frame\n");
1162 
1163 			desc->ctrl = ctrl | MACB_BIT(TX_USED);
1164 		}
1165 
1166 		macb_tx_unmap(bp, tx_skb, 0);
1167 	}
1168 
1169 	/* Set end of TX queue */
1170 	desc = macb_tx_desc(queue, 0);
1171 	macb_set_addr(bp, desc, 0);
1172 	desc->ctrl = MACB_BIT(TX_USED);
1173 
1174 	/* Make descriptor updates visible to hardware */
1175 	wmb();
1176 
1177 	/* Reinitialize the TX desc queue */
1178 	queue_writel(queue, TBQP, lower_32_bits(queue->tx_ring_dma));
1179 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
1180 	if (bp->hw_dma_cap & HW_DMA_CAP_64B)
1181 		queue_writel(queue, TBQPH, upper_32_bits(queue->tx_ring_dma));
1182 #endif
1183 	/* Make TX ring reflect state of hardware */
1184 	queue->tx_head = 0;
1185 	queue->tx_tail = 0;
1186 
1187 	/* Housework before enabling TX IRQ */
1188 	macb_writel(bp, TSR, macb_readl(bp, TSR));
1189 	queue_writel(queue, IER, MACB_TX_INT_FLAGS);
1190 
1191 	if (halt_timeout)
1192 		macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TE));
1193 
1194 	/* Now we are ready to start transmission again */
1195 	netif_tx_start_all_queues(bp->dev);
1196 	macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
1197 
1198 	spin_unlock_irqrestore(&bp->lock, flags);
1199 	napi_enable(&queue->napi_tx);
1200 }
1201 
ptp_one_step_sync(struct sk_buff * skb)1202 static bool ptp_one_step_sync(struct sk_buff *skb)
1203 {
1204 	struct ptp_header *hdr;
1205 	unsigned int ptp_class;
1206 	u8 msgtype;
1207 
1208 	/* No need to parse packet if PTP TS is not involved */
1209 	if (likely(!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)))
1210 		goto not_oss;
1211 
1212 	/* Identify and return whether PTP one step sync is being processed */
1213 	ptp_class = ptp_classify_raw(skb);
1214 	if (ptp_class == PTP_CLASS_NONE)
1215 		goto not_oss;
1216 
1217 	hdr = ptp_parse_header(skb, ptp_class);
1218 	if (!hdr)
1219 		goto not_oss;
1220 
1221 	if (hdr->flag_field[0] & PTP_FLAG_TWOSTEP)
1222 		goto not_oss;
1223 
1224 	msgtype = ptp_get_msgtype(hdr, ptp_class);
1225 	if (msgtype == PTP_MSGTYPE_SYNC)
1226 		return true;
1227 
1228 not_oss:
1229 	return false;
1230 }
1231 
macb_tx_complete(struct macb_queue * queue,int budget)1232 static int macb_tx_complete(struct macb_queue *queue, int budget)
1233 {
1234 	struct macb *bp = queue->bp;
1235 	u16 queue_index = queue - bp->queues;
1236 	unsigned int tail;
1237 	unsigned int head;
1238 	int packets = 0;
1239 
1240 	spin_lock(&queue->tx_ptr_lock);
1241 	head = queue->tx_head;
1242 	for (tail = queue->tx_tail; tail != head && packets < budget; tail++) {
1243 		struct macb_tx_skb	*tx_skb;
1244 		struct sk_buff		*skb;
1245 		struct macb_dma_desc	*desc;
1246 		u32			ctrl;
1247 
1248 		desc = macb_tx_desc(queue, tail);
1249 
1250 		/* Make hw descriptor updates visible to CPU */
1251 		rmb();
1252 
1253 		ctrl = desc->ctrl;
1254 
1255 		/* TX_USED bit is only set by hardware on the very first buffer
1256 		 * descriptor of the transmitted frame.
1257 		 */
1258 		if (!(ctrl & MACB_BIT(TX_USED)))
1259 			break;
1260 
1261 		/* Process all buffers of the current transmitted frame */
1262 		for (;; tail++) {
1263 			tx_skb = macb_tx_skb(queue, tail);
1264 			skb = tx_skb->skb;
1265 
1266 			/* First, update TX stats if needed */
1267 			if (skb) {
1268 				if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
1269 				    !ptp_one_step_sync(skb))
1270 					gem_ptp_do_txstamp(bp, skb, desc);
1271 
1272 				netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n",
1273 					    macb_tx_ring_wrap(bp, tail),
1274 					    skb->data);
1275 				bp->dev->stats.tx_packets++;
1276 				queue->stats.tx_packets++;
1277 				bp->dev->stats.tx_bytes += skb->len;
1278 				queue->stats.tx_bytes += skb->len;
1279 				packets++;
1280 			}
1281 
1282 			/* Now we can safely release resources */
1283 			macb_tx_unmap(bp, tx_skb, budget);
1284 
1285 			/* skb is set only for the last buffer of the frame.
1286 			 * WARNING: at this point skb has been freed by
1287 			 * macb_tx_unmap().
1288 			 */
1289 			if (skb)
1290 				break;
1291 		}
1292 	}
1293 
1294 	queue->tx_tail = tail;
1295 	if (__netif_subqueue_stopped(bp->dev, queue_index) &&
1296 	    CIRC_CNT(queue->tx_head, queue->tx_tail,
1297 		     bp->tx_ring_size) <= MACB_TX_WAKEUP_THRESH(bp))
1298 		netif_wake_subqueue(bp->dev, queue_index);
1299 	spin_unlock(&queue->tx_ptr_lock);
1300 
1301 	return packets;
1302 }
1303 
gem_rx_refill(struct macb_queue * queue)1304 static void gem_rx_refill(struct macb_queue *queue)
1305 {
1306 	unsigned int		entry;
1307 	struct sk_buff		*skb;
1308 	dma_addr_t		paddr;
1309 	struct macb *bp = queue->bp;
1310 	struct macb_dma_desc *desc;
1311 
1312 	while (CIRC_SPACE(queue->rx_prepared_head, queue->rx_tail,
1313 			bp->rx_ring_size) > 0) {
1314 		entry = macb_rx_ring_wrap(bp, queue->rx_prepared_head);
1315 
1316 		/* Make hw descriptor updates visible to CPU */
1317 		rmb();
1318 
1319 		desc = macb_rx_desc(queue, entry);
1320 
1321 		if (!queue->rx_skbuff[entry]) {
1322 			/* allocate sk_buff for this free entry in ring */
1323 			skb = netdev_alloc_skb(bp->dev, bp->rx_buffer_size);
1324 			if (unlikely(!skb)) {
1325 				netdev_err(bp->dev,
1326 					   "Unable to allocate sk_buff\n");
1327 				break;
1328 			}
1329 
1330 			/* now fill corresponding descriptor entry */
1331 			paddr = dma_map_single(&bp->pdev->dev, skb->data,
1332 					       bp->rx_buffer_size,
1333 					       DMA_FROM_DEVICE);
1334 			if (dma_mapping_error(&bp->pdev->dev, paddr)) {
1335 				dev_kfree_skb(skb);
1336 				break;
1337 			}
1338 
1339 			queue->rx_skbuff[entry] = skb;
1340 
1341 			if (entry == bp->rx_ring_size - 1)
1342 				paddr |= MACB_BIT(RX_WRAP);
1343 			desc->ctrl = 0;
1344 			/* Setting addr clears RX_USED and allows reception,
1345 			 * make sure ctrl is cleared first to avoid a race.
1346 			 */
1347 			dma_wmb();
1348 			macb_set_addr(bp, desc, paddr);
1349 
1350 			/* properly align Ethernet header */
1351 			skb_reserve(skb, NET_IP_ALIGN);
1352 		} else {
1353 			desc->ctrl = 0;
1354 			dma_wmb();
1355 			desc->addr &= ~MACB_BIT(RX_USED);
1356 		}
1357 		queue->rx_prepared_head++;
1358 	}
1359 
1360 	/* Make descriptor updates visible to hardware */
1361 	wmb();
1362 
1363 	netdev_vdbg(bp->dev, "rx ring: queue: %p, prepared head %d, tail %d\n",
1364 			queue, queue->rx_prepared_head, queue->rx_tail);
1365 }
1366 
1367 /* Mark DMA descriptors from begin up to and not including end as unused */
discard_partial_frame(struct macb_queue * queue,unsigned int begin,unsigned int end)1368 static void discard_partial_frame(struct macb_queue *queue, unsigned int begin,
1369 				  unsigned int end)
1370 {
1371 	unsigned int frag;
1372 
1373 	for (frag = begin; frag != end; frag++) {
1374 		struct macb_dma_desc *desc = macb_rx_desc(queue, frag);
1375 
1376 		desc->addr &= ~MACB_BIT(RX_USED);
1377 	}
1378 
1379 	/* Make descriptor updates visible to hardware */
1380 	wmb();
1381 
1382 	/* When this happens, the hardware stats registers for
1383 	 * whatever caused this is updated, so we don't have to record
1384 	 * anything.
1385 	 */
1386 }
1387 
gem_rx(struct macb_queue * queue,struct napi_struct * napi,int budget)1388 static int gem_rx(struct macb_queue *queue, struct napi_struct *napi,
1389 		  int budget)
1390 {
1391 	struct macb *bp = queue->bp;
1392 	unsigned int		len;
1393 	unsigned int		entry;
1394 	struct sk_buff		*skb;
1395 	struct macb_dma_desc	*desc;
1396 	int			count = 0;
1397 
1398 	while (count < budget) {
1399 		u32 ctrl;
1400 		dma_addr_t addr;
1401 		bool rxused;
1402 
1403 		entry = macb_rx_ring_wrap(bp, queue->rx_tail);
1404 		desc = macb_rx_desc(queue, entry);
1405 
1406 		/* Make hw descriptor updates visible to CPU */
1407 		rmb();
1408 
1409 		rxused = (desc->addr & MACB_BIT(RX_USED)) ? true : false;
1410 		addr = macb_get_addr(bp, desc);
1411 
1412 		if (!rxused)
1413 			break;
1414 
1415 		/* Ensure ctrl is at least as up-to-date as rxused */
1416 		dma_rmb();
1417 
1418 		ctrl = desc->ctrl;
1419 
1420 		queue->rx_tail++;
1421 		count++;
1422 
1423 		if (!(ctrl & MACB_BIT(RX_SOF) && ctrl & MACB_BIT(RX_EOF))) {
1424 			netdev_err(bp->dev,
1425 				   "not whole frame pointed by descriptor\n");
1426 			bp->dev->stats.rx_dropped++;
1427 			queue->stats.rx_dropped++;
1428 			break;
1429 		}
1430 		skb = queue->rx_skbuff[entry];
1431 		if (unlikely(!skb)) {
1432 			netdev_err(bp->dev,
1433 				   "inconsistent Rx descriptor chain\n");
1434 			bp->dev->stats.rx_dropped++;
1435 			queue->stats.rx_dropped++;
1436 			break;
1437 		}
1438 		/* now everything is ready for receiving packet */
1439 		queue->rx_skbuff[entry] = NULL;
1440 		len = ctrl & bp->rx_frm_len_mask;
1441 
1442 		netdev_vdbg(bp->dev, "gem_rx %u (len %u)\n", entry, len);
1443 
1444 		skb_put(skb, len);
1445 		dma_unmap_single(&bp->pdev->dev, addr,
1446 				 bp->rx_buffer_size, DMA_FROM_DEVICE);
1447 
1448 		skb->protocol = eth_type_trans(skb, bp->dev);
1449 		skb_checksum_none_assert(skb);
1450 		if (bp->dev->features & NETIF_F_RXCSUM &&
1451 		    !(bp->dev->flags & IFF_PROMISC) &&
1452 		    GEM_BFEXT(RX_CSUM, ctrl) & GEM_RX_CSUM_CHECKED_MASK)
1453 			skb->ip_summed = CHECKSUM_UNNECESSARY;
1454 
1455 		bp->dev->stats.rx_packets++;
1456 		queue->stats.rx_packets++;
1457 		bp->dev->stats.rx_bytes += skb->len;
1458 		queue->stats.rx_bytes += skb->len;
1459 
1460 		gem_ptp_do_rxstamp(bp, skb, desc);
1461 
1462 #if defined(DEBUG) && defined(VERBOSE_DEBUG)
1463 		netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
1464 			    skb->len, skb->csum);
1465 		print_hex_dump(KERN_DEBUG, " mac: ", DUMP_PREFIX_ADDRESS, 16, 1,
1466 			       skb_mac_header(skb), 16, true);
1467 		print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_ADDRESS, 16, 1,
1468 			       skb->data, 32, true);
1469 #endif
1470 
1471 		napi_gro_receive(napi, skb);
1472 	}
1473 
1474 	gem_rx_refill(queue);
1475 
1476 	return count;
1477 }
1478 
macb_rx_frame(struct macb_queue * queue,struct napi_struct * napi,unsigned int first_frag,unsigned int last_frag)1479 static int macb_rx_frame(struct macb_queue *queue, struct napi_struct *napi,
1480 			 unsigned int first_frag, unsigned int last_frag)
1481 {
1482 	unsigned int len;
1483 	unsigned int frag;
1484 	unsigned int offset;
1485 	struct sk_buff *skb;
1486 	struct macb_dma_desc *desc;
1487 	struct macb *bp = queue->bp;
1488 
1489 	desc = macb_rx_desc(queue, last_frag);
1490 	len = desc->ctrl & bp->rx_frm_len_mask;
1491 
1492 	netdev_vdbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n",
1493 		macb_rx_ring_wrap(bp, first_frag),
1494 		macb_rx_ring_wrap(bp, last_frag), len);
1495 
1496 	/* The ethernet header starts NET_IP_ALIGN bytes into the
1497 	 * first buffer. Since the header is 14 bytes, this makes the
1498 	 * payload word-aligned.
1499 	 *
1500 	 * Instead of calling skb_reserve(NET_IP_ALIGN), we just copy
1501 	 * the two padding bytes into the skb so that we avoid hitting
1502 	 * the slowpath in memcpy(), and pull them off afterwards.
1503 	 */
1504 	skb = netdev_alloc_skb(bp->dev, len + NET_IP_ALIGN);
1505 	if (!skb) {
1506 		bp->dev->stats.rx_dropped++;
1507 		for (frag = first_frag; ; frag++) {
1508 			desc = macb_rx_desc(queue, frag);
1509 			desc->addr &= ~MACB_BIT(RX_USED);
1510 			if (frag == last_frag)
1511 				break;
1512 		}
1513 
1514 		/* Make descriptor updates visible to hardware */
1515 		wmb();
1516 
1517 		return 1;
1518 	}
1519 
1520 	offset = 0;
1521 	len += NET_IP_ALIGN;
1522 	skb_checksum_none_assert(skb);
1523 	skb_put(skb, len);
1524 
1525 	for (frag = first_frag; ; frag++) {
1526 		unsigned int frag_len = bp->rx_buffer_size;
1527 
1528 		if (offset + frag_len > len) {
1529 			if (unlikely(frag != last_frag)) {
1530 				dev_kfree_skb_any(skb);
1531 				return -1;
1532 			}
1533 			frag_len = len - offset;
1534 		}
1535 		skb_copy_to_linear_data_offset(skb, offset,
1536 					       macb_rx_buffer(queue, frag),
1537 					       frag_len);
1538 		offset += bp->rx_buffer_size;
1539 		desc = macb_rx_desc(queue, frag);
1540 		desc->addr &= ~MACB_BIT(RX_USED);
1541 
1542 		if (frag == last_frag)
1543 			break;
1544 	}
1545 
1546 	/* Make descriptor updates visible to hardware */
1547 	wmb();
1548 
1549 	__skb_pull(skb, NET_IP_ALIGN);
1550 	skb->protocol = eth_type_trans(skb, bp->dev);
1551 
1552 	bp->dev->stats.rx_packets++;
1553 	bp->dev->stats.rx_bytes += skb->len;
1554 	netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
1555 		    skb->len, skb->csum);
1556 	napi_gro_receive(napi, skb);
1557 
1558 	return 0;
1559 }
1560 
macb_init_rx_ring(struct macb_queue * queue)1561 static inline void macb_init_rx_ring(struct macb_queue *queue)
1562 {
1563 	struct macb *bp = queue->bp;
1564 	dma_addr_t addr;
1565 	struct macb_dma_desc *desc = NULL;
1566 	int i;
1567 
1568 	addr = queue->rx_buffers_dma;
1569 	for (i = 0; i < bp->rx_ring_size; i++) {
1570 		desc = macb_rx_desc(queue, i);
1571 		macb_set_addr(bp, desc, addr);
1572 		desc->ctrl = 0;
1573 		addr += bp->rx_buffer_size;
1574 	}
1575 	desc->addr |= MACB_BIT(RX_WRAP);
1576 	queue->rx_tail = 0;
1577 }
1578 
macb_rx(struct macb_queue * queue,struct napi_struct * napi,int budget)1579 static int macb_rx(struct macb_queue *queue, struct napi_struct *napi,
1580 		   int budget)
1581 {
1582 	struct macb *bp = queue->bp;
1583 	bool reset_rx_queue = false;
1584 	int received = 0;
1585 	unsigned int tail;
1586 	int first_frag = -1;
1587 
1588 	for (tail = queue->rx_tail; budget > 0; tail++) {
1589 		struct macb_dma_desc *desc = macb_rx_desc(queue, tail);
1590 		u32 ctrl;
1591 
1592 		/* Make hw descriptor updates visible to CPU */
1593 		rmb();
1594 
1595 		if (!(desc->addr & MACB_BIT(RX_USED)))
1596 			break;
1597 
1598 		/* Ensure ctrl is at least as up-to-date as addr */
1599 		dma_rmb();
1600 
1601 		ctrl = desc->ctrl;
1602 
1603 		if (ctrl & MACB_BIT(RX_SOF)) {
1604 			if (first_frag != -1)
1605 				discard_partial_frame(queue, first_frag, tail);
1606 			first_frag = tail;
1607 		}
1608 
1609 		if (ctrl & MACB_BIT(RX_EOF)) {
1610 			int dropped;
1611 
1612 			if (unlikely(first_frag == -1)) {
1613 				reset_rx_queue = true;
1614 				continue;
1615 			}
1616 
1617 			dropped = macb_rx_frame(queue, napi, first_frag, tail);
1618 			first_frag = -1;
1619 			if (unlikely(dropped < 0)) {
1620 				reset_rx_queue = true;
1621 				continue;
1622 			}
1623 			if (!dropped) {
1624 				received++;
1625 				budget--;
1626 			}
1627 		}
1628 	}
1629 
1630 	if (unlikely(reset_rx_queue)) {
1631 		unsigned long flags;
1632 		u32 ctrl;
1633 
1634 		netdev_err(bp->dev, "RX queue corruption: reset it\n");
1635 
1636 		spin_lock_irqsave(&bp->lock, flags);
1637 
1638 		ctrl = macb_readl(bp, NCR);
1639 		macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE));
1640 
1641 		macb_init_rx_ring(queue);
1642 		queue_writel(queue, RBQP, queue->rx_ring_dma);
1643 
1644 		macb_writel(bp, NCR, ctrl | MACB_BIT(RE));
1645 
1646 		spin_unlock_irqrestore(&bp->lock, flags);
1647 		return received;
1648 	}
1649 
1650 	if (first_frag != -1)
1651 		queue->rx_tail = first_frag;
1652 	else
1653 		queue->rx_tail = tail;
1654 
1655 	return received;
1656 }
1657 
macb_rx_pending(struct macb_queue * queue)1658 static bool macb_rx_pending(struct macb_queue *queue)
1659 {
1660 	struct macb *bp = queue->bp;
1661 	unsigned int		entry;
1662 	struct macb_dma_desc	*desc;
1663 
1664 	entry = macb_rx_ring_wrap(bp, queue->rx_tail);
1665 	desc = macb_rx_desc(queue, entry);
1666 
1667 	/* Make hw descriptor updates visible to CPU */
1668 	rmb();
1669 
1670 	return (desc->addr & MACB_BIT(RX_USED)) != 0;
1671 }
1672 
macb_rx_poll(struct napi_struct * napi,int budget)1673 static int macb_rx_poll(struct napi_struct *napi, int budget)
1674 {
1675 	struct macb_queue *queue = container_of(napi, struct macb_queue, napi_rx);
1676 	struct macb *bp = queue->bp;
1677 	int work_done;
1678 
1679 	work_done = bp->macbgem_ops.mog_rx(queue, napi, budget);
1680 
1681 	netdev_vdbg(bp->dev, "RX poll: queue = %u, work_done = %d, budget = %d\n",
1682 		    (unsigned int)(queue - bp->queues), work_done, budget);
1683 
1684 	if (work_done < budget && napi_complete_done(napi, work_done)) {
1685 		queue_writel(queue, IER, bp->rx_intr_mask);
1686 
1687 		/* Packet completions only seem to propagate to raise
1688 		 * interrupts when interrupts are enabled at the time, so if
1689 		 * packets were received while interrupts were disabled,
1690 		 * they will not cause another interrupt to be generated when
1691 		 * interrupts are re-enabled.
1692 		 * Check for this case here to avoid losing a wakeup. This can
1693 		 * potentially race with the interrupt handler doing the same
1694 		 * actions if an interrupt is raised just after enabling them,
1695 		 * but this should be harmless.
1696 		 */
1697 		if (macb_rx_pending(queue)) {
1698 			queue_writel(queue, IDR, bp->rx_intr_mask);
1699 			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1700 				queue_writel(queue, ISR, MACB_BIT(RCOMP));
1701 			netdev_vdbg(bp->dev, "poll: packets pending, reschedule\n");
1702 			napi_schedule(napi);
1703 		}
1704 	}
1705 
1706 	/* TODO: Handle errors */
1707 
1708 	return work_done;
1709 }
1710 
macb_tx_restart(struct macb_queue * queue)1711 static void macb_tx_restart(struct macb_queue *queue)
1712 {
1713 	struct macb *bp = queue->bp;
1714 	unsigned int head_idx, tbqp;
1715 
1716 	spin_lock(&queue->tx_ptr_lock);
1717 
1718 	if (queue->tx_head == queue->tx_tail)
1719 		goto out_tx_ptr_unlock;
1720 
1721 	tbqp = queue_readl(queue, TBQP) / macb_dma_desc_get_size(bp);
1722 	tbqp = macb_adj_dma_desc_idx(bp, macb_tx_ring_wrap(bp, tbqp));
1723 	head_idx = macb_adj_dma_desc_idx(bp, macb_tx_ring_wrap(bp, queue->tx_head));
1724 
1725 	if (tbqp == head_idx)
1726 		goto out_tx_ptr_unlock;
1727 
1728 	spin_lock_irq(&bp->lock);
1729 	macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
1730 	spin_unlock_irq(&bp->lock);
1731 
1732 out_tx_ptr_unlock:
1733 	spin_unlock(&queue->tx_ptr_lock);
1734 }
1735 
macb_tx_complete_pending(struct macb_queue * queue)1736 static bool macb_tx_complete_pending(struct macb_queue *queue)
1737 {
1738 	bool retval = false;
1739 
1740 	spin_lock(&queue->tx_ptr_lock);
1741 	if (queue->tx_head != queue->tx_tail) {
1742 		/* Make hw descriptor updates visible to CPU */
1743 		rmb();
1744 
1745 		if (macb_tx_desc(queue, queue->tx_tail)->ctrl & MACB_BIT(TX_USED))
1746 			retval = true;
1747 	}
1748 	spin_unlock(&queue->tx_ptr_lock);
1749 	return retval;
1750 }
1751 
macb_tx_poll(struct napi_struct * napi,int budget)1752 static int macb_tx_poll(struct napi_struct *napi, int budget)
1753 {
1754 	struct macb_queue *queue = container_of(napi, struct macb_queue, napi_tx);
1755 	struct macb *bp = queue->bp;
1756 	int work_done;
1757 
1758 	work_done = macb_tx_complete(queue, budget);
1759 
1760 	rmb(); // ensure txubr_pending is up to date
1761 	if (queue->txubr_pending) {
1762 		queue->txubr_pending = false;
1763 		netdev_vdbg(bp->dev, "poll: tx restart\n");
1764 		macb_tx_restart(queue);
1765 	}
1766 
1767 	netdev_vdbg(bp->dev, "TX poll: queue = %u, work_done = %d, budget = %d\n",
1768 		    (unsigned int)(queue - bp->queues), work_done, budget);
1769 
1770 	if (work_done < budget && napi_complete_done(napi, work_done)) {
1771 		queue_writel(queue, IER, MACB_BIT(TCOMP));
1772 
1773 		/* Packet completions only seem to propagate to raise
1774 		 * interrupts when interrupts are enabled at the time, so if
1775 		 * packets were sent while interrupts were disabled,
1776 		 * they will not cause another interrupt to be generated when
1777 		 * interrupts are re-enabled.
1778 		 * Check for this case here to avoid losing a wakeup. This can
1779 		 * potentially race with the interrupt handler doing the same
1780 		 * actions if an interrupt is raised just after enabling them,
1781 		 * but this should be harmless.
1782 		 */
1783 		if (macb_tx_complete_pending(queue)) {
1784 			queue_writel(queue, IDR, MACB_BIT(TCOMP));
1785 			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1786 				queue_writel(queue, ISR, MACB_BIT(TCOMP));
1787 			netdev_vdbg(bp->dev, "TX poll: packets pending, reschedule\n");
1788 			napi_schedule(napi);
1789 		}
1790 	}
1791 
1792 	return work_done;
1793 }
1794 
macb_hresp_error_task(struct tasklet_struct * t)1795 static void macb_hresp_error_task(struct tasklet_struct *t)
1796 {
1797 	struct macb *bp = from_tasklet(bp, t, hresp_err_tasklet);
1798 	struct net_device *dev = bp->dev;
1799 	struct macb_queue *queue;
1800 	unsigned int q;
1801 	u32 ctrl;
1802 
1803 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
1804 		queue_writel(queue, IDR, bp->rx_intr_mask |
1805 					 MACB_TX_INT_FLAGS |
1806 					 MACB_BIT(HRESP));
1807 	}
1808 	ctrl = macb_readl(bp, NCR);
1809 	ctrl &= ~(MACB_BIT(RE) | MACB_BIT(TE));
1810 	macb_writel(bp, NCR, ctrl);
1811 
1812 	netif_tx_stop_all_queues(dev);
1813 	netif_carrier_off(dev);
1814 
1815 	bp->macbgem_ops.mog_init_rings(bp);
1816 
1817 	/* Initialize TX and RX buffers */
1818 	macb_init_buffers(bp);
1819 
1820 	/* Enable interrupts */
1821 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
1822 		queue_writel(queue, IER,
1823 			     bp->rx_intr_mask |
1824 			     MACB_TX_INT_FLAGS |
1825 			     MACB_BIT(HRESP));
1826 
1827 	ctrl |= MACB_BIT(RE) | MACB_BIT(TE);
1828 	macb_writel(bp, NCR, ctrl);
1829 
1830 	netif_carrier_on(dev);
1831 	netif_tx_start_all_queues(dev);
1832 }
1833 
macb_wol_interrupt(int irq,void * dev_id)1834 static irqreturn_t macb_wol_interrupt(int irq, void *dev_id)
1835 {
1836 	struct macb_queue *queue = dev_id;
1837 	struct macb *bp = queue->bp;
1838 	u32 status;
1839 
1840 	status = queue_readl(queue, ISR);
1841 
1842 	if (unlikely(!status))
1843 		return IRQ_NONE;
1844 
1845 	spin_lock(&bp->lock);
1846 
1847 	if (status & MACB_BIT(WOL)) {
1848 		queue_writel(queue, IDR, MACB_BIT(WOL));
1849 		macb_writel(bp, WOL, 0);
1850 		netdev_vdbg(bp->dev, "MACB WoL: queue = %u, isr = 0x%08lx\n",
1851 			    (unsigned int)(queue - bp->queues),
1852 			    (unsigned long)status);
1853 		if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1854 			queue_writel(queue, ISR, MACB_BIT(WOL));
1855 		pm_wakeup_event(&bp->pdev->dev, 0);
1856 	}
1857 
1858 	spin_unlock(&bp->lock);
1859 
1860 	return IRQ_HANDLED;
1861 }
1862 
gem_wol_interrupt(int irq,void * dev_id)1863 static irqreturn_t gem_wol_interrupt(int irq, void *dev_id)
1864 {
1865 	struct macb_queue *queue = dev_id;
1866 	struct macb *bp = queue->bp;
1867 	u32 status;
1868 
1869 	status = queue_readl(queue, ISR);
1870 
1871 	if (unlikely(!status))
1872 		return IRQ_NONE;
1873 
1874 	spin_lock(&bp->lock);
1875 
1876 	if (status & GEM_BIT(WOL)) {
1877 		queue_writel(queue, IDR, GEM_BIT(WOL));
1878 		gem_writel(bp, WOL, 0);
1879 		netdev_vdbg(bp->dev, "GEM WoL: queue = %u, isr = 0x%08lx\n",
1880 			    (unsigned int)(queue - bp->queues),
1881 			    (unsigned long)status);
1882 		if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1883 			queue_writel(queue, ISR, GEM_BIT(WOL));
1884 		pm_wakeup_event(&bp->pdev->dev, 0);
1885 	}
1886 
1887 	spin_unlock(&bp->lock);
1888 
1889 	return IRQ_HANDLED;
1890 }
1891 
macb_interrupt(int irq,void * dev_id)1892 static irqreturn_t macb_interrupt(int irq, void *dev_id)
1893 {
1894 	struct macb_queue *queue = dev_id;
1895 	struct macb *bp = queue->bp;
1896 	struct net_device *dev = bp->dev;
1897 	u32 status, ctrl;
1898 
1899 	status = queue_readl(queue, ISR);
1900 
1901 	if (unlikely(!status))
1902 		return IRQ_NONE;
1903 
1904 	spin_lock(&bp->lock);
1905 
1906 	while (status) {
1907 		/* close possible race with dev_close */
1908 		if (unlikely(!netif_running(dev))) {
1909 			queue_writel(queue, IDR, -1);
1910 			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1911 				queue_writel(queue, ISR, -1);
1912 			break;
1913 		}
1914 
1915 		netdev_vdbg(bp->dev, "queue = %u, isr = 0x%08lx\n",
1916 			    (unsigned int)(queue - bp->queues),
1917 			    (unsigned long)status);
1918 
1919 		if (status & bp->rx_intr_mask) {
1920 			/* There's no point taking any more interrupts
1921 			 * until we have processed the buffers. The
1922 			 * scheduling call may fail if the poll routine
1923 			 * is already scheduled, so disable interrupts
1924 			 * now.
1925 			 */
1926 			queue_writel(queue, IDR, bp->rx_intr_mask);
1927 			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1928 				queue_writel(queue, ISR, MACB_BIT(RCOMP));
1929 
1930 			if (napi_schedule_prep(&queue->napi_rx)) {
1931 				netdev_vdbg(bp->dev, "scheduling RX softirq\n");
1932 				__napi_schedule(&queue->napi_rx);
1933 			}
1934 		}
1935 
1936 		if (status & (MACB_BIT(TCOMP) |
1937 			      MACB_BIT(TXUBR))) {
1938 			queue_writel(queue, IDR, MACB_BIT(TCOMP));
1939 			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1940 				queue_writel(queue, ISR, MACB_BIT(TCOMP) |
1941 							 MACB_BIT(TXUBR));
1942 
1943 			if (status & MACB_BIT(TXUBR)) {
1944 				queue->txubr_pending = true;
1945 				wmb(); // ensure softirq can see update
1946 			}
1947 
1948 			if (napi_schedule_prep(&queue->napi_tx)) {
1949 				netdev_vdbg(bp->dev, "scheduling TX softirq\n");
1950 				__napi_schedule(&queue->napi_tx);
1951 			}
1952 		}
1953 
1954 		if (unlikely(status & (MACB_TX_ERR_FLAGS))) {
1955 			queue_writel(queue, IDR, MACB_TX_INT_FLAGS);
1956 			schedule_work(&queue->tx_error_task);
1957 
1958 			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1959 				queue_writel(queue, ISR, MACB_TX_ERR_FLAGS);
1960 
1961 			break;
1962 		}
1963 
1964 		/* Link change detection isn't possible with RMII, so we'll
1965 		 * add that if/when we get our hands on a full-blown MII PHY.
1966 		 */
1967 
1968 		/* There is a hardware issue under heavy load where DMA can
1969 		 * stop, this causes endless "used buffer descriptor read"
1970 		 * interrupts but it can be cleared by re-enabling RX. See
1971 		 * the at91rm9200 manual, section 41.3.1 or the Zynq manual
1972 		 * section 16.7.4 for details. RXUBR is only enabled for
1973 		 * these two versions.
1974 		 */
1975 		if (status & MACB_BIT(RXUBR)) {
1976 			ctrl = macb_readl(bp, NCR);
1977 			macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE));
1978 			wmb();
1979 			macb_writel(bp, NCR, ctrl | MACB_BIT(RE));
1980 
1981 			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1982 				queue_writel(queue, ISR, MACB_BIT(RXUBR));
1983 		}
1984 
1985 		if (status & MACB_BIT(ISR_ROVR)) {
1986 			/* We missed at least one packet */
1987 			if (macb_is_gem(bp))
1988 				bp->hw_stats.gem.rx_overruns++;
1989 			else
1990 				bp->hw_stats.macb.rx_overruns++;
1991 
1992 			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
1993 				queue_writel(queue, ISR, MACB_BIT(ISR_ROVR));
1994 		}
1995 
1996 		if (status & MACB_BIT(HRESP)) {
1997 			tasklet_schedule(&bp->hresp_err_tasklet);
1998 			netdev_err(dev, "DMA bus error: HRESP not OK\n");
1999 
2000 			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
2001 				queue_writel(queue, ISR, MACB_BIT(HRESP));
2002 		}
2003 		status = queue_readl(queue, ISR);
2004 	}
2005 
2006 	spin_unlock(&bp->lock);
2007 
2008 	return IRQ_HANDLED;
2009 }
2010 
2011 #ifdef CONFIG_NET_POLL_CONTROLLER
2012 /* Polling receive - used by netconsole and other diagnostic tools
2013  * to allow network i/o with interrupts disabled.
2014  */
macb_poll_controller(struct net_device * dev)2015 static void macb_poll_controller(struct net_device *dev)
2016 {
2017 	struct macb *bp = netdev_priv(dev);
2018 	struct macb_queue *queue;
2019 	unsigned long flags;
2020 	unsigned int q;
2021 
2022 	local_irq_save(flags);
2023 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
2024 		macb_interrupt(dev->irq, queue);
2025 	local_irq_restore(flags);
2026 }
2027 #endif
2028 
macb_tx_map(struct macb * bp,struct macb_queue * queue,struct sk_buff * skb,unsigned int hdrlen)2029 static unsigned int macb_tx_map(struct macb *bp,
2030 				struct macb_queue *queue,
2031 				struct sk_buff *skb,
2032 				unsigned int hdrlen)
2033 {
2034 	dma_addr_t mapping;
2035 	unsigned int len, entry, i, tx_head = queue->tx_head;
2036 	struct macb_tx_skb *tx_skb = NULL;
2037 	struct macb_dma_desc *desc;
2038 	unsigned int offset, size, count = 0;
2039 	unsigned int f, nr_frags = skb_shinfo(skb)->nr_frags;
2040 	unsigned int eof = 1, mss_mfs = 0;
2041 	u32 ctrl, lso_ctrl = 0, seq_ctrl = 0;
2042 
2043 	/* LSO */
2044 	if (skb_shinfo(skb)->gso_size != 0) {
2045 		if (ip_hdr(skb)->protocol == IPPROTO_UDP)
2046 			/* UDP - UFO */
2047 			lso_ctrl = MACB_LSO_UFO_ENABLE;
2048 		else
2049 			/* TCP - TSO */
2050 			lso_ctrl = MACB_LSO_TSO_ENABLE;
2051 	}
2052 
2053 	/* First, map non-paged data */
2054 	len = skb_headlen(skb);
2055 
2056 	/* first buffer length */
2057 	size = hdrlen;
2058 
2059 	offset = 0;
2060 	while (len) {
2061 		entry = macb_tx_ring_wrap(bp, tx_head);
2062 		tx_skb = &queue->tx_skb[entry];
2063 
2064 		mapping = dma_map_single(&bp->pdev->dev,
2065 					 skb->data + offset,
2066 					 size, DMA_TO_DEVICE);
2067 		if (dma_mapping_error(&bp->pdev->dev, mapping))
2068 			goto dma_error;
2069 
2070 		/* Save info to properly release resources */
2071 		tx_skb->skb = NULL;
2072 		tx_skb->mapping = mapping;
2073 		tx_skb->size = size;
2074 		tx_skb->mapped_as_page = false;
2075 
2076 		len -= size;
2077 		offset += size;
2078 		count++;
2079 		tx_head++;
2080 
2081 		size = min(len, bp->max_tx_length);
2082 	}
2083 
2084 	/* Then, map paged data from fragments */
2085 	for (f = 0; f < nr_frags; f++) {
2086 		const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
2087 
2088 		len = skb_frag_size(frag);
2089 		offset = 0;
2090 		while (len) {
2091 			size = min(len, bp->max_tx_length);
2092 			entry = macb_tx_ring_wrap(bp, tx_head);
2093 			tx_skb = &queue->tx_skb[entry];
2094 
2095 			mapping = skb_frag_dma_map(&bp->pdev->dev, frag,
2096 						   offset, size, DMA_TO_DEVICE);
2097 			if (dma_mapping_error(&bp->pdev->dev, mapping))
2098 				goto dma_error;
2099 
2100 			/* Save info to properly release resources */
2101 			tx_skb->skb = NULL;
2102 			tx_skb->mapping = mapping;
2103 			tx_skb->size = size;
2104 			tx_skb->mapped_as_page = true;
2105 
2106 			len -= size;
2107 			offset += size;
2108 			count++;
2109 			tx_head++;
2110 		}
2111 	}
2112 
2113 	/* Should never happen */
2114 	if (unlikely(!tx_skb)) {
2115 		netdev_err(bp->dev, "BUG! empty skb!\n");
2116 		return 0;
2117 	}
2118 
2119 	/* This is the last buffer of the frame: save socket buffer */
2120 	tx_skb->skb = skb;
2121 
2122 	/* Update TX ring: update buffer descriptors in reverse order
2123 	 * to avoid race condition
2124 	 */
2125 
2126 	/* Set 'TX_USED' bit in buffer descriptor at tx_head position
2127 	 * to set the end of TX queue
2128 	 */
2129 	i = tx_head;
2130 	entry = macb_tx_ring_wrap(bp, i);
2131 	ctrl = MACB_BIT(TX_USED);
2132 	desc = macb_tx_desc(queue, entry);
2133 	desc->ctrl = ctrl;
2134 
2135 	if (lso_ctrl) {
2136 		if (lso_ctrl == MACB_LSO_UFO_ENABLE)
2137 			/* include header and FCS in value given to h/w */
2138 			mss_mfs = skb_shinfo(skb)->gso_size +
2139 					skb_transport_offset(skb) +
2140 					ETH_FCS_LEN;
2141 		else /* TSO */ {
2142 			mss_mfs = skb_shinfo(skb)->gso_size;
2143 			/* TCP Sequence Number Source Select
2144 			 * can be set only for TSO
2145 			 */
2146 			seq_ctrl = 0;
2147 		}
2148 	}
2149 
2150 	do {
2151 		i--;
2152 		entry = macb_tx_ring_wrap(bp, i);
2153 		tx_skb = &queue->tx_skb[entry];
2154 		desc = macb_tx_desc(queue, entry);
2155 
2156 		ctrl = (u32)tx_skb->size;
2157 		if (eof) {
2158 			ctrl |= MACB_BIT(TX_LAST);
2159 			eof = 0;
2160 		}
2161 		if (unlikely(entry == (bp->tx_ring_size - 1)))
2162 			ctrl |= MACB_BIT(TX_WRAP);
2163 
2164 		/* First descriptor is header descriptor */
2165 		if (i == queue->tx_head) {
2166 			ctrl |= MACB_BF(TX_LSO, lso_ctrl);
2167 			ctrl |= MACB_BF(TX_TCP_SEQ_SRC, seq_ctrl);
2168 			if ((bp->dev->features & NETIF_F_HW_CSUM) &&
2169 			    skb->ip_summed != CHECKSUM_PARTIAL && !lso_ctrl &&
2170 			    !ptp_one_step_sync(skb))
2171 				ctrl |= MACB_BIT(TX_NOCRC);
2172 		} else
2173 			/* Only set MSS/MFS on payload descriptors
2174 			 * (second or later descriptor)
2175 			 */
2176 			ctrl |= MACB_BF(MSS_MFS, mss_mfs);
2177 
2178 		/* Set TX buffer descriptor */
2179 		macb_set_addr(bp, desc, tx_skb->mapping);
2180 		/* desc->addr must be visible to hardware before clearing
2181 		 * 'TX_USED' bit in desc->ctrl.
2182 		 */
2183 		wmb();
2184 		desc->ctrl = ctrl;
2185 	} while (i != queue->tx_head);
2186 
2187 	queue->tx_head = tx_head;
2188 
2189 	return count;
2190 
2191 dma_error:
2192 	netdev_err(bp->dev, "TX DMA map failed\n");
2193 
2194 	for (i = queue->tx_head; i != tx_head; i++) {
2195 		tx_skb = macb_tx_skb(queue, i);
2196 
2197 		macb_tx_unmap(bp, tx_skb, 0);
2198 	}
2199 
2200 	return 0;
2201 }
2202 
macb_features_check(struct sk_buff * skb,struct net_device * dev,netdev_features_t features)2203 static netdev_features_t macb_features_check(struct sk_buff *skb,
2204 					     struct net_device *dev,
2205 					     netdev_features_t features)
2206 {
2207 	unsigned int nr_frags, f;
2208 	unsigned int hdrlen;
2209 
2210 	/* Validate LSO compatibility */
2211 
2212 	/* there is only one buffer or protocol is not UDP */
2213 	if (!skb_is_nonlinear(skb) || (ip_hdr(skb)->protocol != IPPROTO_UDP))
2214 		return features;
2215 
2216 	/* length of header */
2217 	hdrlen = skb_transport_offset(skb);
2218 
2219 	/* For UFO only:
2220 	 * When software supplies two or more payload buffers all payload buffers
2221 	 * apart from the last must be a multiple of 8 bytes in size.
2222 	 */
2223 	if (!IS_ALIGNED(skb_headlen(skb) - hdrlen, MACB_TX_LEN_ALIGN))
2224 		return features & ~MACB_NETIF_LSO;
2225 
2226 	nr_frags = skb_shinfo(skb)->nr_frags;
2227 	/* No need to check last fragment */
2228 	nr_frags--;
2229 	for (f = 0; f < nr_frags; f++) {
2230 		const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
2231 
2232 		if (!IS_ALIGNED(skb_frag_size(frag), MACB_TX_LEN_ALIGN))
2233 			return features & ~MACB_NETIF_LSO;
2234 	}
2235 	return features;
2236 }
2237 
macb_clear_csum(struct sk_buff * skb)2238 static inline int macb_clear_csum(struct sk_buff *skb)
2239 {
2240 	/* no change for packets without checksum offloading */
2241 	if (skb->ip_summed != CHECKSUM_PARTIAL)
2242 		return 0;
2243 
2244 	/* make sure we can modify the header */
2245 	if (unlikely(skb_cow_head(skb, 0)))
2246 		return -1;
2247 
2248 	/* initialize checksum field
2249 	 * This is required - at least for Zynq, which otherwise calculates
2250 	 * wrong UDP header checksums for UDP packets with UDP data len <=2
2251 	 */
2252 	*(__sum16 *)(skb_checksum_start(skb) + skb->csum_offset) = 0;
2253 	return 0;
2254 }
2255 
macb_pad_and_fcs(struct sk_buff ** skb,struct net_device * ndev)2256 static int macb_pad_and_fcs(struct sk_buff **skb, struct net_device *ndev)
2257 {
2258 	bool cloned = skb_cloned(*skb) || skb_header_cloned(*skb) ||
2259 		      skb_is_nonlinear(*skb);
2260 	int padlen = ETH_ZLEN - (*skb)->len;
2261 	int tailroom = skb_tailroom(*skb);
2262 	struct sk_buff *nskb;
2263 	u32 fcs;
2264 
2265 	if (!(ndev->features & NETIF_F_HW_CSUM) ||
2266 	    !((*skb)->ip_summed != CHECKSUM_PARTIAL) ||
2267 	    skb_shinfo(*skb)->gso_size || ptp_one_step_sync(*skb))
2268 		return 0;
2269 
2270 	if (padlen <= 0) {
2271 		/* FCS could be appeded to tailroom. */
2272 		if (tailroom >= ETH_FCS_LEN)
2273 			goto add_fcs;
2274 		/* No room for FCS, need to reallocate skb. */
2275 		else
2276 			padlen = ETH_FCS_LEN;
2277 	} else {
2278 		/* Add room for FCS. */
2279 		padlen += ETH_FCS_LEN;
2280 	}
2281 
2282 	if (cloned || tailroom < padlen) {
2283 		nskb = skb_copy_expand(*skb, 0, padlen, GFP_ATOMIC);
2284 		if (!nskb)
2285 			return -ENOMEM;
2286 
2287 		dev_consume_skb_any(*skb);
2288 		*skb = nskb;
2289 	}
2290 
2291 	if (padlen > ETH_FCS_LEN)
2292 		skb_put_zero(*skb, padlen - ETH_FCS_LEN);
2293 
2294 add_fcs:
2295 	/* set FCS to packet */
2296 	fcs = crc32_le(~0, (*skb)->data, (*skb)->len);
2297 	fcs = ~fcs;
2298 
2299 	skb_put_u8(*skb, fcs		& 0xff);
2300 	skb_put_u8(*skb, (fcs >> 8)	& 0xff);
2301 	skb_put_u8(*skb, (fcs >> 16)	& 0xff);
2302 	skb_put_u8(*skb, (fcs >> 24)	& 0xff);
2303 
2304 	return 0;
2305 }
2306 
macb_start_xmit(struct sk_buff * skb,struct net_device * dev)2307 static netdev_tx_t macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
2308 {
2309 	u16 queue_index = skb_get_queue_mapping(skb);
2310 	struct macb *bp = netdev_priv(dev);
2311 	struct macb_queue *queue = &bp->queues[queue_index];
2312 	unsigned int desc_cnt, nr_frags, frag_size, f;
2313 	unsigned int hdrlen;
2314 	bool is_lso;
2315 	netdev_tx_t ret = NETDEV_TX_OK;
2316 
2317 	if (macb_clear_csum(skb)) {
2318 		dev_kfree_skb_any(skb);
2319 		return ret;
2320 	}
2321 
2322 	if (macb_pad_and_fcs(&skb, dev)) {
2323 		dev_kfree_skb_any(skb);
2324 		return ret;
2325 	}
2326 
2327 #ifdef CONFIG_MACB_USE_HWSTAMP
2328 	if ((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
2329 	    (bp->hw_dma_cap & HW_DMA_CAP_PTP))
2330 		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
2331 #endif
2332 
2333 	is_lso = (skb_shinfo(skb)->gso_size != 0);
2334 
2335 	if (is_lso) {
2336 		/* length of headers */
2337 		if (ip_hdr(skb)->protocol == IPPROTO_UDP)
2338 			/* only queue eth + ip headers separately for UDP */
2339 			hdrlen = skb_transport_offset(skb);
2340 		else
2341 			hdrlen = skb_tcp_all_headers(skb);
2342 		if (skb_headlen(skb) < hdrlen) {
2343 			netdev_err(bp->dev, "Error - LSO headers fragmented!!!\n");
2344 			/* if this is required, would need to copy to single buffer */
2345 			return NETDEV_TX_BUSY;
2346 		}
2347 	} else
2348 		hdrlen = min(skb_headlen(skb), bp->max_tx_length);
2349 
2350 #if defined(DEBUG) && defined(VERBOSE_DEBUG)
2351 	netdev_vdbg(bp->dev,
2352 		    "start_xmit: queue %hu len %u head %p data %p tail %p end %p\n",
2353 		    queue_index, skb->len, skb->head, skb->data,
2354 		    skb_tail_pointer(skb), skb_end_pointer(skb));
2355 	print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1,
2356 		       skb->data, 16, true);
2357 #endif
2358 
2359 	/* Count how many TX buffer descriptors are needed to send this
2360 	 * socket buffer: skb fragments of jumbo frames may need to be
2361 	 * split into many buffer descriptors.
2362 	 */
2363 	if (is_lso && (skb_headlen(skb) > hdrlen))
2364 		/* extra header descriptor if also payload in first buffer */
2365 		desc_cnt = DIV_ROUND_UP((skb_headlen(skb) - hdrlen), bp->max_tx_length) + 1;
2366 	else
2367 		desc_cnt = DIV_ROUND_UP(skb_headlen(skb), bp->max_tx_length);
2368 	nr_frags = skb_shinfo(skb)->nr_frags;
2369 	for (f = 0; f < nr_frags; f++) {
2370 		frag_size = skb_frag_size(&skb_shinfo(skb)->frags[f]);
2371 		desc_cnt += DIV_ROUND_UP(frag_size, bp->max_tx_length);
2372 	}
2373 
2374 	spin_lock_bh(&queue->tx_ptr_lock);
2375 
2376 	/* This is a hard error, log it. */
2377 	if (CIRC_SPACE(queue->tx_head, queue->tx_tail,
2378 		       bp->tx_ring_size) < desc_cnt) {
2379 		netif_stop_subqueue(dev, queue_index);
2380 		netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n",
2381 			   queue->tx_head, queue->tx_tail);
2382 		ret = NETDEV_TX_BUSY;
2383 		goto unlock;
2384 	}
2385 
2386 	/* Map socket buffer for DMA transfer */
2387 	if (!macb_tx_map(bp, queue, skb, hdrlen)) {
2388 		dev_kfree_skb_any(skb);
2389 		goto unlock;
2390 	}
2391 
2392 	/* Make newly initialized descriptor visible to hardware */
2393 	wmb();
2394 	skb_tx_timestamp(skb);
2395 
2396 	spin_lock_irq(&bp->lock);
2397 	macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
2398 	spin_unlock_irq(&bp->lock);
2399 
2400 	if (CIRC_SPACE(queue->tx_head, queue->tx_tail, bp->tx_ring_size) < 1)
2401 		netif_stop_subqueue(dev, queue_index);
2402 
2403 unlock:
2404 	spin_unlock_bh(&queue->tx_ptr_lock);
2405 
2406 	return ret;
2407 }
2408 
macb_init_rx_buffer_size(struct macb * bp,size_t size)2409 static void macb_init_rx_buffer_size(struct macb *bp, size_t size)
2410 {
2411 	if (!macb_is_gem(bp)) {
2412 		bp->rx_buffer_size = MACB_RX_BUFFER_SIZE;
2413 	} else {
2414 		bp->rx_buffer_size = size;
2415 
2416 		if (bp->rx_buffer_size % RX_BUFFER_MULTIPLE) {
2417 			netdev_dbg(bp->dev,
2418 				   "RX buffer must be multiple of %d bytes, expanding\n",
2419 				   RX_BUFFER_MULTIPLE);
2420 			bp->rx_buffer_size =
2421 				roundup(bp->rx_buffer_size, RX_BUFFER_MULTIPLE);
2422 		}
2423 	}
2424 
2425 	netdev_dbg(bp->dev, "mtu [%u] rx_buffer_size [%zu]\n",
2426 		   bp->dev->mtu, bp->rx_buffer_size);
2427 }
2428 
gem_free_rx_buffers(struct macb * bp)2429 static void gem_free_rx_buffers(struct macb *bp)
2430 {
2431 	struct sk_buff		*skb;
2432 	struct macb_dma_desc	*desc;
2433 	struct macb_queue *queue;
2434 	dma_addr_t		addr;
2435 	unsigned int q;
2436 	int i;
2437 
2438 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
2439 		if (!queue->rx_skbuff)
2440 			continue;
2441 
2442 		for (i = 0; i < bp->rx_ring_size; i++) {
2443 			skb = queue->rx_skbuff[i];
2444 
2445 			if (!skb)
2446 				continue;
2447 
2448 			desc = macb_rx_desc(queue, i);
2449 			addr = macb_get_addr(bp, desc);
2450 
2451 			dma_unmap_single(&bp->pdev->dev, addr, bp->rx_buffer_size,
2452 					DMA_FROM_DEVICE);
2453 			dev_kfree_skb_any(skb);
2454 			skb = NULL;
2455 		}
2456 
2457 		kfree(queue->rx_skbuff);
2458 		queue->rx_skbuff = NULL;
2459 	}
2460 }
2461 
macb_free_rx_buffers(struct macb * bp)2462 static void macb_free_rx_buffers(struct macb *bp)
2463 {
2464 	struct macb_queue *queue = &bp->queues[0];
2465 
2466 	if (queue->rx_buffers) {
2467 		dma_free_coherent(&bp->pdev->dev,
2468 				  bp->rx_ring_size * bp->rx_buffer_size,
2469 				  queue->rx_buffers, queue->rx_buffers_dma);
2470 		queue->rx_buffers = NULL;
2471 	}
2472 }
2473 
macb_free_consistent(struct macb * bp)2474 static void macb_free_consistent(struct macb *bp)
2475 {
2476 	struct macb_queue *queue;
2477 	unsigned int q;
2478 	int size;
2479 
2480 	bp->macbgem_ops.mog_free_rx_buffers(bp);
2481 
2482 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
2483 		kfree(queue->tx_skb);
2484 		queue->tx_skb = NULL;
2485 		if (queue->tx_ring) {
2486 			size = TX_RING_BYTES(bp) + bp->tx_bd_rd_prefetch;
2487 			dma_free_coherent(&bp->pdev->dev, size,
2488 					  queue->tx_ring, queue->tx_ring_dma);
2489 			queue->tx_ring = NULL;
2490 		}
2491 		if (queue->rx_ring) {
2492 			size = RX_RING_BYTES(bp) + bp->rx_bd_rd_prefetch;
2493 			dma_free_coherent(&bp->pdev->dev, size,
2494 					  queue->rx_ring, queue->rx_ring_dma);
2495 			queue->rx_ring = NULL;
2496 		}
2497 	}
2498 }
2499 
gem_alloc_rx_buffers(struct macb * bp)2500 static int gem_alloc_rx_buffers(struct macb *bp)
2501 {
2502 	struct macb_queue *queue;
2503 	unsigned int q;
2504 	int size;
2505 
2506 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
2507 		size = bp->rx_ring_size * sizeof(struct sk_buff *);
2508 		queue->rx_skbuff = kzalloc(size, GFP_KERNEL);
2509 		if (!queue->rx_skbuff)
2510 			return -ENOMEM;
2511 		else
2512 			netdev_dbg(bp->dev,
2513 				   "Allocated %d RX struct sk_buff entries at %p\n",
2514 				   bp->rx_ring_size, queue->rx_skbuff);
2515 	}
2516 	return 0;
2517 }
2518 
macb_alloc_rx_buffers(struct macb * bp)2519 static int macb_alloc_rx_buffers(struct macb *bp)
2520 {
2521 	struct macb_queue *queue = &bp->queues[0];
2522 	int size;
2523 
2524 	size = bp->rx_ring_size * bp->rx_buffer_size;
2525 	queue->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size,
2526 					    &queue->rx_buffers_dma, GFP_KERNEL);
2527 	if (!queue->rx_buffers)
2528 		return -ENOMEM;
2529 
2530 	netdev_dbg(bp->dev,
2531 		   "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n",
2532 		   size, (unsigned long)queue->rx_buffers_dma, queue->rx_buffers);
2533 	return 0;
2534 }
2535 
macb_alloc_consistent(struct macb * bp)2536 static int macb_alloc_consistent(struct macb *bp)
2537 {
2538 	struct macb_queue *queue;
2539 	unsigned int q;
2540 	int size;
2541 
2542 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
2543 		size = TX_RING_BYTES(bp) + bp->tx_bd_rd_prefetch;
2544 		queue->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
2545 						    &queue->tx_ring_dma,
2546 						    GFP_KERNEL);
2547 		if (!queue->tx_ring)
2548 			goto out_err;
2549 		netdev_dbg(bp->dev,
2550 			   "Allocated TX ring for queue %u of %d bytes at %08lx (mapped %p)\n",
2551 			   q, size, (unsigned long)queue->tx_ring_dma,
2552 			   queue->tx_ring);
2553 
2554 		size = bp->tx_ring_size * sizeof(struct macb_tx_skb);
2555 		queue->tx_skb = kmalloc(size, GFP_KERNEL);
2556 		if (!queue->tx_skb)
2557 			goto out_err;
2558 
2559 		size = RX_RING_BYTES(bp) + bp->rx_bd_rd_prefetch;
2560 		queue->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
2561 						 &queue->rx_ring_dma, GFP_KERNEL);
2562 		if (!queue->rx_ring)
2563 			goto out_err;
2564 		netdev_dbg(bp->dev,
2565 			   "Allocated RX ring of %d bytes at %08lx (mapped %p)\n",
2566 			   size, (unsigned long)queue->rx_ring_dma, queue->rx_ring);
2567 	}
2568 	if (bp->macbgem_ops.mog_alloc_rx_buffers(bp))
2569 		goto out_err;
2570 
2571 	return 0;
2572 
2573 out_err:
2574 	macb_free_consistent(bp);
2575 	return -ENOMEM;
2576 }
2577 
gem_init_rings(struct macb * bp)2578 static void gem_init_rings(struct macb *bp)
2579 {
2580 	struct macb_queue *queue;
2581 	struct macb_dma_desc *desc = NULL;
2582 	unsigned int q;
2583 	int i;
2584 
2585 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
2586 		for (i = 0; i < bp->tx_ring_size; i++) {
2587 			desc = macb_tx_desc(queue, i);
2588 			macb_set_addr(bp, desc, 0);
2589 			desc->ctrl = MACB_BIT(TX_USED);
2590 		}
2591 		desc->ctrl |= MACB_BIT(TX_WRAP);
2592 		queue->tx_head = 0;
2593 		queue->tx_tail = 0;
2594 
2595 		queue->rx_tail = 0;
2596 		queue->rx_prepared_head = 0;
2597 
2598 		gem_rx_refill(queue);
2599 	}
2600 
2601 }
2602 
macb_init_rings(struct macb * bp)2603 static void macb_init_rings(struct macb *bp)
2604 {
2605 	int i;
2606 	struct macb_dma_desc *desc = NULL;
2607 
2608 	macb_init_rx_ring(&bp->queues[0]);
2609 
2610 	for (i = 0; i < bp->tx_ring_size; i++) {
2611 		desc = macb_tx_desc(&bp->queues[0], i);
2612 		macb_set_addr(bp, desc, 0);
2613 		desc->ctrl = MACB_BIT(TX_USED);
2614 	}
2615 	bp->queues[0].tx_head = 0;
2616 	bp->queues[0].tx_tail = 0;
2617 	desc->ctrl |= MACB_BIT(TX_WRAP);
2618 }
2619 
macb_reset_hw(struct macb * bp)2620 static void macb_reset_hw(struct macb *bp)
2621 {
2622 	struct macb_queue *queue;
2623 	unsigned int q;
2624 	u32 ctrl = macb_readl(bp, NCR);
2625 
2626 	/* Disable RX and TX (XXX: Should we halt the transmission
2627 	 * more gracefully?)
2628 	 */
2629 	ctrl &= ~(MACB_BIT(RE) | MACB_BIT(TE));
2630 
2631 	/* Clear the stats registers (XXX: Update stats first?) */
2632 	ctrl |= MACB_BIT(CLRSTAT);
2633 
2634 	macb_writel(bp, NCR, ctrl);
2635 
2636 	/* Clear all status flags */
2637 	macb_writel(bp, TSR, -1);
2638 	macb_writel(bp, RSR, -1);
2639 
2640 	/* Disable RX partial store and forward and reset watermark value */
2641 	gem_writel(bp, PBUFRXCUT, 0);
2642 
2643 	/* Disable all interrupts */
2644 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
2645 		queue_writel(queue, IDR, -1);
2646 		queue_readl(queue, ISR);
2647 		if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
2648 			queue_writel(queue, ISR, -1);
2649 	}
2650 }
2651 
gem_mdc_clk_div(struct macb * bp)2652 static u32 gem_mdc_clk_div(struct macb *bp)
2653 {
2654 	u32 config;
2655 	unsigned long pclk_hz = clk_get_rate(bp->pclk);
2656 
2657 	if (pclk_hz <= 20000000)
2658 		config = GEM_BF(CLK, GEM_CLK_DIV8);
2659 	else if (pclk_hz <= 40000000)
2660 		config = GEM_BF(CLK, GEM_CLK_DIV16);
2661 	else if (pclk_hz <= 80000000)
2662 		config = GEM_BF(CLK, GEM_CLK_DIV32);
2663 	else if (pclk_hz <= 120000000)
2664 		config = GEM_BF(CLK, GEM_CLK_DIV48);
2665 	else if (pclk_hz <= 160000000)
2666 		config = GEM_BF(CLK, GEM_CLK_DIV64);
2667 	else if (pclk_hz <= 240000000)
2668 		config = GEM_BF(CLK, GEM_CLK_DIV96);
2669 	else if (pclk_hz <= 320000000)
2670 		config = GEM_BF(CLK, GEM_CLK_DIV128);
2671 	else
2672 		config = GEM_BF(CLK, GEM_CLK_DIV224);
2673 
2674 	return config;
2675 }
2676 
macb_mdc_clk_div(struct macb * bp)2677 static u32 macb_mdc_clk_div(struct macb *bp)
2678 {
2679 	u32 config;
2680 	unsigned long pclk_hz;
2681 
2682 	if (macb_is_gem(bp))
2683 		return gem_mdc_clk_div(bp);
2684 
2685 	pclk_hz = clk_get_rate(bp->pclk);
2686 	if (pclk_hz <= 20000000)
2687 		config = MACB_BF(CLK, MACB_CLK_DIV8);
2688 	else if (pclk_hz <= 40000000)
2689 		config = MACB_BF(CLK, MACB_CLK_DIV16);
2690 	else if (pclk_hz <= 80000000)
2691 		config = MACB_BF(CLK, MACB_CLK_DIV32);
2692 	else
2693 		config = MACB_BF(CLK, MACB_CLK_DIV64);
2694 
2695 	return config;
2696 }
2697 
2698 /* Get the DMA bus width field of the network configuration register that we
2699  * should program.  We find the width from decoding the design configuration
2700  * register to find the maximum supported data bus width.
2701  */
macb_dbw(struct macb * bp)2702 static u32 macb_dbw(struct macb *bp)
2703 {
2704 	if (!macb_is_gem(bp))
2705 		return 0;
2706 
2707 	switch (GEM_BFEXT(DBWDEF, gem_readl(bp, DCFG1))) {
2708 	case 4:
2709 		return GEM_BF(DBW, GEM_DBW128);
2710 	case 2:
2711 		return GEM_BF(DBW, GEM_DBW64);
2712 	case 1:
2713 	default:
2714 		return GEM_BF(DBW, GEM_DBW32);
2715 	}
2716 }
2717 
2718 /* Configure the receive DMA engine
2719  * - use the correct receive buffer size
2720  * - set best burst length for DMA operations
2721  *   (if not supported by FIFO, it will fallback to default)
2722  * - set both rx/tx packet buffers to full memory size
2723  * These are configurable parameters for GEM.
2724  */
macb_configure_dma(struct macb * bp)2725 static void macb_configure_dma(struct macb *bp)
2726 {
2727 	struct macb_queue *queue;
2728 	u32 buffer_size;
2729 	unsigned int q;
2730 	u32 dmacfg;
2731 
2732 	buffer_size = bp->rx_buffer_size / RX_BUFFER_MULTIPLE;
2733 	if (macb_is_gem(bp)) {
2734 		dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L);
2735 		for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
2736 			if (q)
2737 				queue_writel(queue, RBQS, buffer_size);
2738 			else
2739 				dmacfg |= GEM_BF(RXBS, buffer_size);
2740 		}
2741 		if (bp->dma_burst_length)
2742 			dmacfg = GEM_BFINS(FBLDO, bp->dma_burst_length, dmacfg);
2743 		dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L);
2744 		dmacfg &= ~GEM_BIT(ENDIA_PKT);
2745 
2746 		if (bp->native_io)
2747 			dmacfg &= ~GEM_BIT(ENDIA_DESC);
2748 		else
2749 			dmacfg |= GEM_BIT(ENDIA_DESC); /* CPU in big endian */
2750 
2751 		if (bp->dev->features & NETIF_F_HW_CSUM)
2752 			dmacfg |= GEM_BIT(TXCOEN);
2753 		else
2754 			dmacfg &= ~GEM_BIT(TXCOEN);
2755 
2756 		dmacfg &= ~GEM_BIT(ADDR64);
2757 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
2758 		if (bp->hw_dma_cap & HW_DMA_CAP_64B)
2759 			dmacfg |= GEM_BIT(ADDR64);
2760 #endif
2761 #ifdef CONFIG_MACB_USE_HWSTAMP
2762 		if (bp->hw_dma_cap & HW_DMA_CAP_PTP)
2763 			dmacfg |= GEM_BIT(RXEXT) | GEM_BIT(TXEXT);
2764 #endif
2765 		netdev_dbg(bp->dev, "Cadence configure DMA with 0x%08x\n",
2766 			   dmacfg);
2767 		gem_writel(bp, DMACFG, dmacfg);
2768 	}
2769 }
2770 
macb_init_hw(struct macb * bp)2771 static void macb_init_hw(struct macb *bp)
2772 {
2773 	u32 config;
2774 
2775 	macb_reset_hw(bp);
2776 	macb_set_hwaddr(bp);
2777 
2778 	config = macb_mdc_clk_div(bp);
2779 	config |= MACB_BF(RBOF, NET_IP_ALIGN);	/* Make eth data aligned */
2780 	config |= MACB_BIT(DRFCS);		/* Discard Rx FCS */
2781 	if (bp->caps & MACB_CAPS_JUMBO)
2782 		config |= MACB_BIT(JFRAME);	/* Enable jumbo frames */
2783 	else
2784 		config |= MACB_BIT(BIG);	/* Receive oversized frames */
2785 	if (bp->dev->flags & IFF_PROMISC)
2786 		config |= MACB_BIT(CAF);	/* Copy All Frames */
2787 	else if (macb_is_gem(bp) && bp->dev->features & NETIF_F_RXCSUM)
2788 		config |= GEM_BIT(RXCOEN);
2789 	if (!(bp->dev->flags & IFF_BROADCAST))
2790 		config |= MACB_BIT(NBC);	/* No BroadCast */
2791 	config |= macb_dbw(bp);
2792 	macb_writel(bp, NCFGR, config);
2793 	if ((bp->caps & MACB_CAPS_JUMBO) && bp->jumbo_max_len)
2794 		gem_writel(bp, JML, bp->jumbo_max_len);
2795 	bp->rx_frm_len_mask = MACB_RX_FRMLEN_MASK;
2796 	if (bp->caps & MACB_CAPS_JUMBO)
2797 		bp->rx_frm_len_mask = MACB_RX_JFRMLEN_MASK;
2798 
2799 	macb_configure_dma(bp);
2800 
2801 	/* Enable RX partial store and forward and set watermark */
2802 	if (bp->rx_watermark)
2803 		gem_writel(bp, PBUFRXCUT, (bp->rx_watermark | GEM_BIT(ENCUTTHRU)));
2804 }
2805 
2806 /* The hash address register is 64 bits long and takes up two
2807  * locations in the memory map.  The least significant bits are stored
2808  * in EMAC_HSL and the most significant bits in EMAC_HSH.
2809  *
2810  * The unicast hash enable and the multicast hash enable bits in the
2811  * network configuration register enable the reception of hash matched
2812  * frames. The destination address is reduced to a 6 bit index into
2813  * the 64 bit hash register using the following hash function.  The
2814  * hash function is an exclusive or of every sixth bit of the
2815  * destination address.
2816  *
2817  * hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
2818  * hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
2819  * hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
2820  * hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
2821  * hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
2822  * hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
2823  *
2824  * da[0] represents the least significant bit of the first byte
2825  * received, that is, the multicast/unicast indicator, and da[47]
2826  * represents the most significant bit of the last byte received.  If
2827  * the hash index, hi[n], points to a bit that is set in the hash
2828  * register then the frame will be matched according to whether the
2829  * frame is multicast or unicast.  A multicast match will be signalled
2830  * if the multicast hash enable bit is set, da[0] is 1 and the hash
2831  * index points to a bit set in the hash register.  A unicast match
2832  * will be signalled if the unicast hash enable bit is set, da[0] is 0
2833  * and the hash index points to a bit set in the hash register.  To
2834  * receive all multicast frames, the hash register should be set with
2835  * all ones and the multicast hash enable bit should be set in the
2836  * network configuration register.
2837  */
2838 
hash_bit_value(int bitnr,__u8 * addr)2839 static inline int hash_bit_value(int bitnr, __u8 *addr)
2840 {
2841 	if (addr[bitnr / 8] & (1 << (bitnr % 8)))
2842 		return 1;
2843 	return 0;
2844 }
2845 
2846 /* Return the hash index value for the specified address. */
hash_get_index(__u8 * addr)2847 static int hash_get_index(__u8 *addr)
2848 {
2849 	int i, j, bitval;
2850 	int hash_index = 0;
2851 
2852 	for (j = 0; j < 6; j++) {
2853 		for (i = 0, bitval = 0; i < 8; i++)
2854 			bitval ^= hash_bit_value(i * 6 + j, addr);
2855 
2856 		hash_index |= (bitval << j);
2857 	}
2858 
2859 	return hash_index;
2860 }
2861 
2862 /* Add multicast addresses to the internal multicast-hash table. */
macb_sethashtable(struct net_device * dev)2863 static void macb_sethashtable(struct net_device *dev)
2864 {
2865 	struct netdev_hw_addr *ha;
2866 	unsigned long mc_filter[2];
2867 	unsigned int bitnr;
2868 	struct macb *bp = netdev_priv(dev);
2869 
2870 	mc_filter[0] = 0;
2871 	mc_filter[1] = 0;
2872 
2873 	netdev_for_each_mc_addr(ha, dev) {
2874 		bitnr = hash_get_index(ha->addr);
2875 		mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
2876 	}
2877 
2878 	macb_or_gem_writel(bp, HRB, mc_filter[0]);
2879 	macb_or_gem_writel(bp, HRT, mc_filter[1]);
2880 }
2881 
2882 /* Enable/Disable promiscuous and multicast modes. */
macb_set_rx_mode(struct net_device * dev)2883 static void macb_set_rx_mode(struct net_device *dev)
2884 {
2885 	unsigned long cfg;
2886 	struct macb *bp = netdev_priv(dev);
2887 
2888 	cfg = macb_readl(bp, NCFGR);
2889 
2890 	if (dev->flags & IFF_PROMISC) {
2891 		/* Enable promiscuous mode */
2892 		cfg |= MACB_BIT(CAF);
2893 
2894 		/* Disable RX checksum offload */
2895 		if (macb_is_gem(bp))
2896 			cfg &= ~GEM_BIT(RXCOEN);
2897 	} else {
2898 		/* Disable promiscuous mode */
2899 		cfg &= ~MACB_BIT(CAF);
2900 
2901 		/* Enable RX checksum offload only if requested */
2902 		if (macb_is_gem(bp) && dev->features & NETIF_F_RXCSUM)
2903 			cfg |= GEM_BIT(RXCOEN);
2904 	}
2905 
2906 	if (dev->flags & IFF_ALLMULTI) {
2907 		/* Enable all multicast mode */
2908 		macb_or_gem_writel(bp, HRB, -1);
2909 		macb_or_gem_writel(bp, HRT, -1);
2910 		cfg |= MACB_BIT(NCFGR_MTI);
2911 	} else if (!netdev_mc_empty(dev)) {
2912 		/* Enable specific multicasts */
2913 		macb_sethashtable(dev);
2914 		cfg |= MACB_BIT(NCFGR_MTI);
2915 	} else if (dev->flags & (~IFF_ALLMULTI)) {
2916 		/* Disable all multicast mode */
2917 		macb_or_gem_writel(bp, HRB, 0);
2918 		macb_or_gem_writel(bp, HRT, 0);
2919 		cfg &= ~MACB_BIT(NCFGR_MTI);
2920 	}
2921 
2922 	macb_writel(bp, NCFGR, cfg);
2923 }
2924 
macb_open(struct net_device * dev)2925 static int macb_open(struct net_device *dev)
2926 {
2927 	size_t bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN;
2928 	struct macb *bp = netdev_priv(dev);
2929 	struct macb_queue *queue;
2930 	unsigned int q;
2931 	int err;
2932 
2933 	netdev_dbg(bp->dev, "open\n");
2934 
2935 	err = pm_runtime_resume_and_get(&bp->pdev->dev);
2936 	if (err < 0)
2937 		return err;
2938 
2939 	/* RX buffers initialization */
2940 	macb_init_rx_buffer_size(bp, bufsz);
2941 
2942 	err = macb_alloc_consistent(bp);
2943 	if (err) {
2944 		netdev_err(dev, "Unable to allocate DMA memory (error %d)\n",
2945 			   err);
2946 		goto pm_exit;
2947 	}
2948 
2949 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
2950 		napi_enable(&queue->napi_rx);
2951 		napi_enable(&queue->napi_tx);
2952 	}
2953 
2954 	macb_init_hw(bp);
2955 
2956 	err = phy_power_on(bp->sgmii_phy);
2957 	if (err)
2958 		goto reset_hw;
2959 
2960 	err = macb_phylink_connect(bp);
2961 	if (err)
2962 		goto phy_off;
2963 
2964 	netif_tx_start_all_queues(dev);
2965 
2966 	if (bp->ptp_info)
2967 		bp->ptp_info->ptp_init(dev);
2968 
2969 	return 0;
2970 
2971 phy_off:
2972 	phy_power_off(bp->sgmii_phy);
2973 
2974 reset_hw:
2975 	macb_reset_hw(bp);
2976 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
2977 		napi_disable(&queue->napi_rx);
2978 		napi_disable(&queue->napi_tx);
2979 	}
2980 	macb_free_consistent(bp);
2981 pm_exit:
2982 	pm_runtime_put_sync(&bp->pdev->dev);
2983 	return err;
2984 }
2985 
macb_close(struct net_device * dev)2986 static int macb_close(struct net_device *dev)
2987 {
2988 	struct macb *bp = netdev_priv(dev);
2989 	struct macb_queue *queue;
2990 	unsigned long flags;
2991 	unsigned int q;
2992 
2993 	netif_tx_stop_all_queues(dev);
2994 
2995 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
2996 		napi_disable(&queue->napi_rx);
2997 		napi_disable(&queue->napi_tx);
2998 	}
2999 
3000 	phylink_stop(bp->phylink);
3001 	phylink_disconnect_phy(bp->phylink);
3002 
3003 	phy_power_off(bp->sgmii_phy);
3004 
3005 	spin_lock_irqsave(&bp->lock, flags);
3006 	macb_reset_hw(bp);
3007 	netif_carrier_off(dev);
3008 	spin_unlock_irqrestore(&bp->lock, flags);
3009 
3010 	macb_free_consistent(bp);
3011 
3012 	if (bp->ptp_info)
3013 		bp->ptp_info->ptp_remove(dev);
3014 
3015 	pm_runtime_put(&bp->pdev->dev);
3016 
3017 	return 0;
3018 }
3019 
macb_change_mtu(struct net_device * dev,int new_mtu)3020 static int macb_change_mtu(struct net_device *dev, int new_mtu)
3021 {
3022 	if (netif_running(dev))
3023 		return -EBUSY;
3024 
3025 	dev->mtu = new_mtu;
3026 
3027 	return 0;
3028 }
3029 
macb_set_mac_addr(struct net_device * dev,void * addr)3030 static int macb_set_mac_addr(struct net_device *dev, void *addr)
3031 {
3032 	int err;
3033 
3034 	err = eth_mac_addr(dev, addr);
3035 	if (err < 0)
3036 		return err;
3037 
3038 	macb_set_hwaddr(netdev_priv(dev));
3039 	return 0;
3040 }
3041 
gem_update_stats(struct macb * bp)3042 static void gem_update_stats(struct macb *bp)
3043 {
3044 	struct macb_queue *queue;
3045 	unsigned int i, q, idx;
3046 	unsigned long *stat;
3047 
3048 	u32 *p = &bp->hw_stats.gem.tx_octets_31_0;
3049 
3050 	for (i = 0; i < GEM_STATS_LEN; ++i, ++p) {
3051 		u32 offset = gem_statistics[i].offset;
3052 		u64 val = bp->macb_reg_readl(bp, offset);
3053 
3054 		bp->ethtool_stats[i] += val;
3055 		*p += val;
3056 
3057 		if (offset == GEM_OCTTXL || offset == GEM_OCTRXL) {
3058 			/* Add GEM_OCTTXH, GEM_OCTRXH */
3059 			val = bp->macb_reg_readl(bp, offset + 4);
3060 			bp->ethtool_stats[i] += ((u64)val) << 32;
3061 			*(++p) += val;
3062 		}
3063 	}
3064 
3065 	idx = GEM_STATS_LEN;
3066 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
3067 		for (i = 0, stat = &queue->stats.first; i < QUEUE_STATS_LEN; ++i, ++stat)
3068 			bp->ethtool_stats[idx++] = *stat;
3069 }
3070 
gem_get_stats(struct macb * bp)3071 static struct net_device_stats *gem_get_stats(struct macb *bp)
3072 {
3073 	struct gem_stats *hwstat = &bp->hw_stats.gem;
3074 	struct net_device_stats *nstat = &bp->dev->stats;
3075 
3076 	if (!netif_running(bp->dev))
3077 		return nstat;
3078 
3079 	gem_update_stats(bp);
3080 
3081 	nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors +
3082 			    hwstat->rx_alignment_errors +
3083 			    hwstat->rx_resource_errors +
3084 			    hwstat->rx_overruns +
3085 			    hwstat->rx_oversize_frames +
3086 			    hwstat->rx_jabbers +
3087 			    hwstat->rx_undersized_frames +
3088 			    hwstat->rx_length_field_frame_errors);
3089 	nstat->tx_errors = (hwstat->tx_late_collisions +
3090 			    hwstat->tx_excessive_collisions +
3091 			    hwstat->tx_underrun +
3092 			    hwstat->tx_carrier_sense_errors);
3093 	nstat->multicast = hwstat->rx_multicast_frames;
3094 	nstat->collisions = (hwstat->tx_single_collision_frames +
3095 			     hwstat->tx_multiple_collision_frames +
3096 			     hwstat->tx_excessive_collisions);
3097 	nstat->rx_length_errors = (hwstat->rx_oversize_frames +
3098 				   hwstat->rx_jabbers +
3099 				   hwstat->rx_undersized_frames +
3100 				   hwstat->rx_length_field_frame_errors);
3101 	nstat->rx_over_errors = hwstat->rx_resource_errors;
3102 	nstat->rx_crc_errors = hwstat->rx_frame_check_sequence_errors;
3103 	nstat->rx_frame_errors = hwstat->rx_alignment_errors;
3104 	nstat->rx_fifo_errors = hwstat->rx_overruns;
3105 	nstat->tx_aborted_errors = hwstat->tx_excessive_collisions;
3106 	nstat->tx_carrier_errors = hwstat->tx_carrier_sense_errors;
3107 	nstat->tx_fifo_errors = hwstat->tx_underrun;
3108 
3109 	return nstat;
3110 }
3111 
gem_get_ethtool_stats(struct net_device * dev,struct ethtool_stats * stats,u64 * data)3112 static void gem_get_ethtool_stats(struct net_device *dev,
3113 				  struct ethtool_stats *stats, u64 *data)
3114 {
3115 	struct macb *bp;
3116 
3117 	bp = netdev_priv(dev);
3118 	gem_update_stats(bp);
3119 	memcpy(data, &bp->ethtool_stats, sizeof(u64)
3120 			* (GEM_STATS_LEN + QUEUE_STATS_LEN * MACB_MAX_QUEUES));
3121 }
3122 
gem_get_sset_count(struct net_device * dev,int sset)3123 static int gem_get_sset_count(struct net_device *dev, int sset)
3124 {
3125 	struct macb *bp = netdev_priv(dev);
3126 
3127 	switch (sset) {
3128 	case ETH_SS_STATS:
3129 		return GEM_STATS_LEN + bp->num_queues * QUEUE_STATS_LEN;
3130 	default:
3131 		return -EOPNOTSUPP;
3132 	}
3133 }
3134 
gem_get_ethtool_strings(struct net_device * dev,u32 sset,u8 * p)3135 static void gem_get_ethtool_strings(struct net_device *dev, u32 sset, u8 *p)
3136 {
3137 	char stat_string[ETH_GSTRING_LEN];
3138 	struct macb *bp = netdev_priv(dev);
3139 	struct macb_queue *queue;
3140 	unsigned int i;
3141 	unsigned int q;
3142 
3143 	switch (sset) {
3144 	case ETH_SS_STATS:
3145 		for (i = 0; i < GEM_STATS_LEN; i++, p += ETH_GSTRING_LEN)
3146 			memcpy(p, gem_statistics[i].stat_string,
3147 			       ETH_GSTRING_LEN);
3148 
3149 		for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
3150 			for (i = 0; i < QUEUE_STATS_LEN; i++, p += ETH_GSTRING_LEN) {
3151 				snprintf(stat_string, ETH_GSTRING_LEN, "q%d_%s",
3152 						q, queue_statistics[i].stat_string);
3153 				memcpy(p, stat_string, ETH_GSTRING_LEN);
3154 			}
3155 		}
3156 		break;
3157 	}
3158 }
3159 
macb_get_stats(struct net_device * dev)3160 static struct net_device_stats *macb_get_stats(struct net_device *dev)
3161 {
3162 	struct macb *bp = netdev_priv(dev);
3163 	struct net_device_stats *nstat = &bp->dev->stats;
3164 	struct macb_stats *hwstat = &bp->hw_stats.macb;
3165 
3166 	if (macb_is_gem(bp))
3167 		return gem_get_stats(bp);
3168 
3169 	/* read stats from hardware */
3170 	macb_update_stats(bp);
3171 
3172 	/* Convert HW stats into netdevice stats */
3173 	nstat->rx_errors = (hwstat->rx_fcs_errors +
3174 			    hwstat->rx_align_errors +
3175 			    hwstat->rx_resource_errors +
3176 			    hwstat->rx_overruns +
3177 			    hwstat->rx_oversize_pkts +
3178 			    hwstat->rx_jabbers +
3179 			    hwstat->rx_undersize_pkts +
3180 			    hwstat->rx_length_mismatch);
3181 	nstat->tx_errors = (hwstat->tx_late_cols +
3182 			    hwstat->tx_excessive_cols +
3183 			    hwstat->tx_underruns +
3184 			    hwstat->tx_carrier_errors +
3185 			    hwstat->sqe_test_errors);
3186 	nstat->collisions = (hwstat->tx_single_cols +
3187 			     hwstat->tx_multiple_cols +
3188 			     hwstat->tx_excessive_cols);
3189 	nstat->rx_length_errors = (hwstat->rx_oversize_pkts +
3190 				   hwstat->rx_jabbers +
3191 				   hwstat->rx_undersize_pkts +
3192 				   hwstat->rx_length_mismatch);
3193 	nstat->rx_over_errors = hwstat->rx_resource_errors +
3194 				   hwstat->rx_overruns;
3195 	nstat->rx_crc_errors = hwstat->rx_fcs_errors;
3196 	nstat->rx_frame_errors = hwstat->rx_align_errors;
3197 	nstat->rx_fifo_errors = hwstat->rx_overruns;
3198 	/* XXX: What does "missed" mean? */
3199 	nstat->tx_aborted_errors = hwstat->tx_excessive_cols;
3200 	nstat->tx_carrier_errors = hwstat->tx_carrier_errors;
3201 	nstat->tx_fifo_errors = hwstat->tx_underruns;
3202 	/* Don't know about heartbeat or window errors... */
3203 
3204 	return nstat;
3205 }
3206 
macb_get_regs_len(struct net_device * netdev)3207 static int macb_get_regs_len(struct net_device *netdev)
3208 {
3209 	return MACB_GREGS_NBR * sizeof(u32);
3210 }
3211 
macb_get_regs(struct net_device * dev,struct ethtool_regs * regs,void * p)3212 static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs,
3213 			  void *p)
3214 {
3215 	struct macb *bp = netdev_priv(dev);
3216 	unsigned int tail, head;
3217 	u32 *regs_buff = p;
3218 
3219 	regs->version = (macb_readl(bp, MID) & ((1 << MACB_REV_SIZE) - 1))
3220 			| MACB_GREGS_VERSION;
3221 
3222 	tail = macb_tx_ring_wrap(bp, bp->queues[0].tx_tail);
3223 	head = macb_tx_ring_wrap(bp, bp->queues[0].tx_head);
3224 
3225 	regs_buff[0]  = macb_readl(bp, NCR);
3226 	regs_buff[1]  = macb_or_gem_readl(bp, NCFGR);
3227 	regs_buff[2]  = macb_readl(bp, NSR);
3228 	regs_buff[3]  = macb_readl(bp, TSR);
3229 	regs_buff[4]  = macb_readl(bp, RBQP);
3230 	regs_buff[5]  = macb_readl(bp, TBQP);
3231 	regs_buff[6]  = macb_readl(bp, RSR);
3232 	regs_buff[7]  = macb_readl(bp, IMR);
3233 
3234 	regs_buff[8]  = tail;
3235 	regs_buff[9]  = head;
3236 	regs_buff[10] = macb_tx_dma(&bp->queues[0], tail);
3237 	regs_buff[11] = macb_tx_dma(&bp->queues[0], head);
3238 
3239 	if (!(bp->caps & MACB_CAPS_USRIO_DISABLED))
3240 		regs_buff[12] = macb_or_gem_readl(bp, USRIO);
3241 	if (macb_is_gem(bp))
3242 		regs_buff[13] = gem_readl(bp, DMACFG);
3243 }
3244 
macb_get_wol(struct net_device * netdev,struct ethtool_wolinfo * wol)3245 static void macb_get_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
3246 {
3247 	struct macb *bp = netdev_priv(netdev);
3248 
3249 	if (bp->wol & MACB_WOL_HAS_MAGIC_PACKET) {
3250 		phylink_ethtool_get_wol(bp->phylink, wol);
3251 		wol->supported |= WAKE_MAGIC;
3252 
3253 		if (bp->wol & MACB_WOL_ENABLED)
3254 			wol->wolopts |= WAKE_MAGIC;
3255 	}
3256 }
3257 
macb_set_wol(struct net_device * netdev,struct ethtool_wolinfo * wol)3258 static int macb_set_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
3259 {
3260 	struct macb *bp = netdev_priv(netdev);
3261 	int ret;
3262 
3263 	/* Pass the order to phylink layer */
3264 	ret = phylink_ethtool_set_wol(bp->phylink, wol);
3265 	/* Don't manage WoL on MAC if handled by the PHY
3266 	 * or if there's a failure in talking to the PHY
3267 	 */
3268 	if (!ret || ret != -EOPNOTSUPP)
3269 		return ret;
3270 
3271 	if (!(bp->wol & MACB_WOL_HAS_MAGIC_PACKET) ||
3272 	    (wol->wolopts & ~WAKE_MAGIC))
3273 		return -EOPNOTSUPP;
3274 
3275 	if (wol->wolopts & WAKE_MAGIC)
3276 		bp->wol |= MACB_WOL_ENABLED;
3277 	else
3278 		bp->wol &= ~MACB_WOL_ENABLED;
3279 
3280 	device_set_wakeup_enable(&bp->pdev->dev, bp->wol & MACB_WOL_ENABLED);
3281 
3282 	return 0;
3283 }
3284 
macb_get_link_ksettings(struct net_device * netdev,struct ethtool_link_ksettings * kset)3285 static int macb_get_link_ksettings(struct net_device *netdev,
3286 				   struct ethtool_link_ksettings *kset)
3287 {
3288 	struct macb *bp = netdev_priv(netdev);
3289 
3290 	return phylink_ethtool_ksettings_get(bp->phylink, kset);
3291 }
3292 
macb_set_link_ksettings(struct net_device * netdev,const struct ethtool_link_ksettings * kset)3293 static int macb_set_link_ksettings(struct net_device *netdev,
3294 				   const struct ethtool_link_ksettings *kset)
3295 {
3296 	struct macb *bp = netdev_priv(netdev);
3297 
3298 	return phylink_ethtool_ksettings_set(bp->phylink, kset);
3299 }
3300 
macb_get_ringparam(struct net_device * netdev,struct ethtool_ringparam * ring,struct kernel_ethtool_ringparam * kernel_ring,struct netlink_ext_ack * extack)3301 static void macb_get_ringparam(struct net_device *netdev,
3302 			       struct ethtool_ringparam *ring,
3303 			       struct kernel_ethtool_ringparam *kernel_ring,
3304 			       struct netlink_ext_ack *extack)
3305 {
3306 	struct macb *bp = netdev_priv(netdev);
3307 
3308 	ring->rx_max_pending = MAX_RX_RING_SIZE;
3309 	ring->tx_max_pending = MAX_TX_RING_SIZE;
3310 
3311 	ring->rx_pending = bp->rx_ring_size;
3312 	ring->tx_pending = bp->tx_ring_size;
3313 }
3314 
macb_set_ringparam(struct net_device * netdev,struct ethtool_ringparam * ring,struct kernel_ethtool_ringparam * kernel_ring,struct netlink_ext_ack * extack)3315 static int macb_set_ringparam(struct net_device *netdev,
3316 			      struct ethtool_ringparam *ring,
3317 			      struct kernel_ethtool_ringparam *kernel_ring,
3318 			      struct netlink_ext_ack *extack)
3319 {
3320 	struct macb *bp = netdev_priv(netdev);
3321 	u32 new_rx_size, new_tx_size;
3322 	unsigned int reset = 0;
3323 
3324 	if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))
3325 		return -EINVAL;
3326 
3327 	new_rx_size = clamp_t(u32, ring->rx_pending,
3328 			      MIN_RX_RING_SIZE, MAX_RX_RING_SIZE);
3329 	new_rx_size = roundup_pow_of_two(new_rx_size);
3330 
3331 	new_tx_size = clamp_t(u32, ring->tx_pending,
3332 			      MIN_TX_RING_SIZE, MAX_TX_RING_SIZE);
3333 	new_tx_size = roundup_pow_of_two(new_tx_size);
3334 
3335 	if ((new_tx_size == bp->tx_ring_size) &&
3336 	    (new_rx_size == bp->rx_ring_size)) {
3337 		/* nothing to do */
3338 		return 0;
3339 	}
3340 
3341 	if (netif_running(bp->dev)) {
3342 		reset = 1;
3343 		macb_close(bp->dev);
3344 	}
3345 
3346 	bp->rx_ring_size = new_rx_size;
3347 	bp->tx_ring_size = new_tx_size;
3348 
3349 	if (reset)
3350 		macb_open(bp->dev);
3351 
3352 	return 0;
3353 }
3354 
3355 #ifdef CONFIG_MACB_USE_HWSTAMP
gem_get_tsu_rate(struct macb * bp)3356 static unsigned int gem_get_tsu_rate(struct macb *bp)
3357 {
3358 	struct clk *tsu_clk;
3359 	unsigned int tsu_rate;
3360 
3361 	tsu_clk = devm_clk_get(&bp->pdev->dev, "tsu_clk");
3362 	if (!IS_ERR(tsu_clk))
3363 		tsu_rate = clk_get_rate(tsu_clk);
3364 	/* try pclk instead */
3365 	else if (!IS_ERR(bp->pclk)) {
3366 		tsu_clk = bp->pclk;
3367 		tsu_rate = clk_get_rate(tsu_clk);
3368 	} else
3369 		return -ENOTSUPP;
3370 	return tsu_rate;
3371 }
3372 
gem_get_ptp_max_adj(void)3373 static s32 gem_get_ptp_max_adj(void)
3374 {
3375 	return 64000000;
3376 }
3377 
gem_get_ts_info(struct net_device * dev,struct ethtool_ts_info * info)3378 static int gem_get_ts_info(struct net_device *dev,
3379 			   struct ethtool_ts_info *info)
3380 {
3381 	struct macb *bp = netdev_priv(dev);
3382 
3383 	if ((bp->hw_dma_cap & HW_DMA_CAP_PTP) == 0) {
3384 		ethtool_op_get_ts_info(dev, info);
3385 		return 0;
3386 	}
3387 
3388 	info->so_timestamping =
3389 		SOF_TIMESTAMPING_TX_SOFTWARE |
3390 		SOF_TIMESTAMPING_RX_SOFTWARE |
3391 		SOF_TIMESTAMPING_SOFTWARE |
3392 		SOF_TIMESTAMPING_TX_HARDWARE |
3393 		SOF_TIMESTAMPING_RX_HARDWARE |
3394 		SOF_TIMESTAMPING_RAW_HARDWARE;
3395 	info->tx_types =
3396 		(1 << HWTSTAMP_TX_ONESTEP_SYNC) |
3397 		(1 << HWTSTAMP_TX_OFF) |
3398 		(1 << HWTSTAMP_TX_ON);
3399 	info->rx_filters =
3400 		(1 << HWTSTAMP_FILTER_NONE) |
3401 		(1 << HWTSTAMP_FILTER_ALL);
3402 
3403 	info->phc_index = bp->ptp_clock ? ptp_clock_index(bp->ptp_clock) : -1;
3404 
3405 	return 0;
3406 }
3407 
3408 static struct macb_ptp_info gem_ptp_info = {
3409 	.ptp_init	 = gem_ptp_init,
3410 	.ptp_remove	 = gem_ptp_remove,
3411 	.get_ptp_max_adj = gem_get_ptp_max_adj,
3412 	.get_tsu_rate	 = gem_get_tsu_rate,
3413 	.get_ts_info	 = gem_get_ts_info,
3414 	.get_hwtst	 = gem_get_hwtst,
3415 	.set_hwtst	 = gem_set_hwtst,
3416 };
3417 #endif
3418 
macb_get_ts_info(struct net_device * netdev,struct ethtool_ts_info * info)3419 static int macb_get_ts_info(struct net_device *netdev,
3420 			    struct ethtool_ts_info *info)
3421 {
3422 	struct macb *bp = netdev_priv(netdev);
3423 
3424 	if (bp->ptp_info)
3425 		return bp->ptp_info->get_ts_info(netdev, info);
3426 
3427 	return ethtool_op_get_ts_info(netdev, info);
3428 }
3429 
gem_enable_flow_filters(struct macb * bp,bool enable)3430 static void gem_enable_flow_filters(struct macb *bp, bool enable)
3431 {
3432 	struct net_device *netdev = bp->dev;
3433 	struct ethtool_rx_fs_item *item;
3434 	u32 t2_scr;
3435 	int num_t2_scr;
3436 
3437 	if (!(netdev->features & NETIF_F_NTUPLE))
3438 		return;
3439 
3440 	num_t2_scr = GEM_BFEXT(T2SCR, gem_readl(bp, DCFG8));
3441 
3442 	list_for_each_entry(item, &bp->rx_fs_list.list, list) {
3443 		struct ethtool_rx_flow_spec *fs = &item->fs;
3444 		struct ethtool_tcpip4_spec *tp4sp_m;
3445 
3446 		if (fs->location >= num_t2_scr)
3447 			continue;
3448 
3449 		t2_scr = gem_readl_n(bp, SCRT2, fs->location);
3450 
3451 		/* enable/disable screener regs for the flow entry */
3452 		t2_scr = GEM_BFINS(ETHTEN, enable, t2_scr);
3453 
3454 		/* only enable fields with no masking */
3455 		tp4sp_m = &(fs->m_u.tcp_ip4_spec);
3456 
3457 		if (enable && (tp4sp_m->ip4src == 0xFFFFFFFF))
3458 			t2_scr = GEM_BFINS(CMPAEN, 1, t2_scr);
3459 		else
3460 			t2_scr = GEM_BFINS(CMPAEN, 0, t2_scr);
3461 
3462 		if (enable && (tp4sp_m->ip4dst == 0xFFFFFFFF))
3463 			t2_scr = GEM_BFINS(CMPBEN, 1, t2_scr);
3464 		else
3465 			t2_scr = GEM_BFINS(CMPBEN, 0, t2_scr);
3466 
3467 		if (enable && ((tp4sp_m->psrc == 0xFFFF) || (tp4sp_m->pdst == 0xFFFF)))
3468 			t2_scr = GEM_BFINS(CMPCEN, 1, t2_scr);
3469 		else
3470 			t2_scr = GEM_BFINS(CMPCEN, 0, t2_scr);
3471 
3472 		gem_writel_n(bp, SCRT2, fs->location, t2_scr);
3473 	}
3474 }
3475 
gem_prog_cmp_regs(struct macb * bp,struct ethtool_rx_flow_spec * fs)3476 static void gem_prog_cmp_regs(struct macb *bp, struct ethtool_rx_flow_spec *fs)
3477 {
3478 	struct ethtool_tcpip4_spec *tp4sp_v, *tp4sp_m;
3479 	uint16_t index = fs->location;
3480 	u32 w0, w1, t2_scr;
3481 	bool cmp_a = false;
3482 	bool cmp_b = false;
3483 	bool cmp_c = false;
3484 
3485 	if (!macb_is_gem(bp))
3486 		return;
3487 
3488 	tp4sp_v = &(fs->h_u.tcp_ip4_spec);
3489 	tp4sp_m = &(fs->m_u.tcp_ip4_spec);
3490 
3491 	/* ignore field if any masking set */
3492 	if (tp4sp_m->ip4src == 0xFFFFFFFF) {
3493 		/* 1st compare reg - IP source address */
3494 		w0 = 0;
3495 		w1 = 0;
3496 		w0 = tp4sp_v->ip4src;
3497 		w1 = GEM_BFINS(T2DISMSK, 1, w1); /* 32-bit compare */
3498 		w1 = GEM_BFINS(T2CMPOFST, GEM_T2COMPOFST_ETYPE, w1);
3499 		w1 = GEM_BFINS(T2OFST, ETYPE_SRCIP_OFFSET, w1);
3500 		gem_writel_n(bp, T2CMPW0, T2CMP_OFST(GEM_IP4SRC_CMP(index)), w0);
3501 		gem_writel_n(bp, T2CMPW1, T2CMP_OFST(GEM_IP4SRC_CMP(index)), w1);
3502 		cmp_a = true;
3503 	}
3504 
3505 	/* ignore field if any masking set */
3506 	if (tp4sp_m->ip4dst == 0xFFFFFFFF) {
3507 		/* 2nd compare reg - IP destination address */
3508 		w0 = 0;
3509 		w1 = 0;
3510 		w0 = tp4sp_v->ip4dst;
3511 		w1 = GEM_BFINS(T2DISMSK, 1, w1); /* 32-bit compare */
3512 		w1 = GEM_BFINS(T2CMPOFST, GEM_T2COMPOFST_ETYPE, w1);
3513 		w1 = GEM_BFINS(T2OFST, ETYPE_DSTIP_OFFSET, w1);
3514 		gem_writel_n(bp, T2CMPW0, T2CMP_OFST(GEM_IP4DST_CMP(index)), w0);
3515 		gem_writel_n(bp, T2CMPW1, T2CMP_OFST(GEM_IP4DST_CMP(index)), w1);
3516 		cmp_b = true;
3517 	}
3518 
3519 	/* ignore both port fields if masking set in both */
3520 	if ((tp4sp_m->psrc == 0xFFFF) || (tp4sp_m->pdst == 0xFFFF)) {
3521 		/* 3rd compare reg - source port, destination port */
3522 		w0 = 0;
3523 		w1 = 0;
3524 		w1 = GEM_BFINS(T2CMPOFST, GEM_T2COMPOFST_IPHDR, w1);
3525 		if (tp4sp_m->psrc == tp4sp_m->pdst) {
3526 			w0 = GEM_BFINS(T2MASK, tp4sp_v->psrc, w0);
3527 			w0 = GEM_BFINS(T2CMP, tp4sp_v->pdst, w0);
3528 			w1 = GEM_BFINS(T2DISMSK, 1, w1); /* 32-bit compare */
3529 			w1 = GEM_BFINS(T2OFST, IPHDR_SRCPORT_OFFSET, w1);
3530 		} else {
3531 			/* only one port definition */
3532 			w1 = GEM_BFINS(T2DISMSK, 0, w1); /* 16-bit compare */
3533 			w0 = GEM_BFINS(T2MASK, 0xFFFF, w0);
3534 			if (tp4sp_m->psrc == 0xFFFF) { /* src port */
3535 				w0 = GEM_BFINS(T2CMP, tp4sp_v->psrc, w0);
3536 				w1 = GEM_BFINS(T2OFST, IPHDR_SRCPORT_OFFSET, w1);
3537 			} else { /* dst port */
3538 				w0 = GEM_BFINS(T2CMP, tp4sp_v->pdst, w0);
3539 				w1 = GEM_BFINS(T2OFST, IPHDR_DSTPORT_OFFSET, w1);
3540 			}
3541 		}
3542 		gem_writel_n(bp, T2CMPW0, T2CMP_OFST(GEM_PORT_CMP(index)), w0);
3543 		gem_writel_n(bp, T2CMPW1, T2CMP_OFST(GEM_PORT_CMP(index)), w1);
3544 		cmp_c = true;
3545 	}
3546 
3547 	t2_scr = 0;
3548 	t2_scr = GEM_BFINS(QUEUE, (fs->ring_cookie) & 0xFF, t2_scr);
3549 	t2_scr = GEM_BFINS(ETHT2IDX, SCRT2_ETHT, t2_scr);
3550 	if (cmp_a)
3551 		t2_scr = GEM_BFINS(CMPA, GEM_IP4SRC_CMP(index), t2_scr);
3552 	if (cmp_b)
3553 		t2_scr = GEM_BFINS(CMPB, GEM_IP4DST_CMP(index), t2_scr);
3554 	if (cmp_c)
3555 		t2_scr = GEM_BFINS(CMPC, GEM_PORT_CMP(index), t2_scr);
3556 	gem_writel_n(bp, SCRT2, index, t2_scr);
3557 }
3558 
gem_add_flow_filter(struct net_device * netdev,struct ethtool_rxnfc * cmd)3559 static int gem_add_flow_filter(struct net_device *netdev,
3560 		struct ethtool_rxnfc *cmd)
3561 {
3562 	struct macb *bp = netdev_priv(netdev);
3563 	struct ethtool_rx_flow_spec *fs = &cmd->fs;
3564 	struct ethtool_rx_fs_item *item, *newfs;
3565 	unsigned long flags;
3566 	int ret = -EINVAL;
3567 	bool added = false;
3568 
3569 	newfs = kmalloc(sizeof(*newfs), GFP_KERNEL);
3570 	if (newfs == NULL)
3571 		return -ENOMEM;
3572 	memcpy(&newfs->fs, fs, sizeof(newfs->fs));
3573 
3574 	netdev_dbg(netdev,
3575 			"Adding flow filter entry,type=%u,queue=%u,loc=%u,src=%08X,dst=%08X,ps=%u,pd=%u\n",
3576 			fs->flow_type, (int)fs->ring_cookie, fs->location,
3577 			htonl(fs->h_u.tcp_ip4_spec.ip4src),
3578 			htonl(fs->h_u.tcp_ip4_spec.ip4dst),
3579 			be16_to_cpu(fs->h_u.tcp_ip4_spec.psrc),
3580 			be16_to_cpu(fs->h_u.tcp_ip4_spec.pdst));
3581 
3582 	spin_lock_irqsave(&bp->rx_fs_lock, flags);
3583 
3584 	/* find correct place to add in list */
3585 	list_for_each_entry(item, &bp->rx_fs_list.list, list) {
3586 		if (item->fs.location > newfs->fs.location) {
3587 			list_add_tail(&newfs->list, &item->list);
3588 			added = true;
3589 			break;
3590 		} else if (item->fs.location == fs->location) {
3591 			netdev_err(netdev, "Rule not added: location %d not free!\n",
3592 					fs->location);
3593 			ret = -EBUSY;
3594 			goto err;
3595 		}
3596 	}
3597 	if (!added)
3598 		list_add_tail(&newfs->list, &bp->rx_fs_list.list);
3599 
3600 	gem_prog_cmp_regs(bp, fs);
3601 	bp->rx_fs_list.count++;
3602 	/* enable filtering if NTUPLE on */
3603 	gem_enable_flow_filters(bp, 1);
3604 
3605 	spin_unlock_irqrestore(&bp->rx_fs_lock, flags);
3606 	return 0;
3607 
3608 err:
3609 	spin_unlock_irqrestore(&bp->rx_fs_lock, flags);
3610 	kfree(newfs);
3611 	return ret;
3612 }
3613 
gem_del_flow_filter(struct net_device * netdev,struct ethtool_rxnfc * cmd)3614 static int gem_del_flow_filter(struct net_device *netdev,
3615 		struct ethtool_rxnfc *cmd)
3616 {
3617 	struct macb *bp = netdev_priv(netdev);
3618 	struct ethtool_rx_fs_item *item;
3619 	struct ethtool_rx_flow_spec *fs;
3620 	unsigned long flags;
3621 
3622 	spin_lock_irqsave(&bp->rx_fs_lock, flags);
3623 
3624 	list_for_each_entry(item, &bp->rx_fs_list.list, list) {
3625 		if (item->fs.location == cmd->fs.location) {
3626 			/* disable screener regs for the flow entry */
3627 			fs = &(item->fs);
3628 			netdev_dbg(netdev,
3629 					"Deleting flow filter entry,type=%u,queue=%u,loc=%u,src=%08X,dst=%08X,ps=%u,pd=%u\n",
3630 					fs->flow_type, (int)fs->ring_cookie, fs->location,
3631 					htonl(fs->h_u.tcp_ip4_spec.ip4src),
3632 					htonl(fs->h_u.tcp_ip4_spec.ip4dst),
3633 					be16_to_cpu(fs->h_u.tcp_ip4_spec.psrc),
3634 					be16_to_cpu(fs->h_u.tcp_ip4_spec.pdst));
3635 
3636 			gem_writel_n(bp, SCRT2, fs->location, 0);
3637 
3638 			list_del(&item->list);
3639 			bp->rx_fs_list.count--;
3640 			spin_unlock_irqrestore(&bp->rx_fs_lock, flags);
3641 			kfree(item);
3642 			return 0;
3643 		}
3644 	}
3645 
3646 	spin_unlock_irqrestore(&bp->rx_fs_lock, flags);
3647 	return -EINVAL;
3648 }
3649 
gem_get_flow_entry(struct net_device * netdev,struct ethtool_rxnfc * cmd)3650 static int gem_get_flow_entry(struct net_device *netdev,
3651 		struct ethtool_rxnfc *cmd)
3652 {
3653 	struct macb *bp = netdev_priv(netdev);
3654 	struct ethtool_rx_fs_item *item;
3655 
3656 	list_for_each_entry(item, &bp->rx_fs_list.list, list) {
3657 		if (item->fs.location == cmd->fs.location) {
3658 			memcpy(&cmd->fs, &item->fs, sizeof(cmd->fs));
3659 			return 0;
3660 		}
3661 	}
3662 	return -EINVAL;
3663 }
3664 
gem_get_all_flow_entries(struct net_device * netdev,struct ethtool_rxnfc * cmd,u32 * rule_locs)3665 static int gem_get_all_flow_entries(struct net_device *netdev,
3666 		struct ethtool_rxnfc *cmd, u32 *rule_locs)
3667 {
3668 	struct macb *bp = netdev_priv(netdev);
3669 	struct ethtool_rx_fs_item *item;
3670 	uint32_t cnt = 0;
3671 
3672 	list_for_each_entry(item, &bp->rx_fs_list.list, list) {
3673 		if (cnt == cmd->rule_cnt)
3674 			return -EMSGSIZE;
3675 		rule_locs[cnt] = item->fs.location;
3676 		cnt++;
3677 	}
3678 	cmd->data = bp->max_tuples;
3679 	cmd->rule_cnt = cnt;
3680 
3681 	return 0;
3682 }
3683 
gem_get_rxnfc(struct net_device * netdev,struct ethtool_rxnfc * cmd,u32 * rule_locs)3684 static int gem_get_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *cmd,
3685 		u32 *rule_locs)
3686 {
3687 	struct macb *bp = netdev_priv(netdev);
3688 	int ret = 0;
3689 
3690 	switch (cmd->cmd) {
3691 	case ETHTOOL_GRXRINGS:
3692 		cmd->data = bp->num_queues;
3693 		break;
3694 	case ETHTOOL_GRXCLSRLCNT:
3695 		cmd->rule_cnt = bp->rx_fs_list.count;
3696 		break;
3697 	case ETHTOOL_GRXCLSRULE:
3698 		ret = gem_get_flow_entry(netdev, cmd);
3699 		break;
3700 	case ETHTOOL_GRXCLSRLALL:
3701 		ret = gem_get_all_flow_entries(netdev, cmd, rule_locs);
3702 		break;
3703 	default:
3704 		netdev_err(netdev,
3705 			  "Command parameter %d is not supported\n", cmd->cmd);
3706 		ret = -EOPNOTSUPP;
3707 	}
3708 
3709 	return ret;
3710 }
3711 
gem_set_rxnfc(struct net_device * netdev,struct ethtool_rxnfc * cmd)3712 static int gem_set_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *cmd)
3713 {
3714 	struct macb *bp = netdev_priv(netdev);
3715 	int ret;
3716 
3717 	switch (cmd->cmd) {
3718 	case ETHTOOL_SRXCLSRLINS:
3719 		if ((cmd->fs.location >= bp->max_tuples)
3720 				|| (cmd->fs.ring_cookie >= bp->num_queues)) {
3721 			ret = -EINVAL;
3722 			break;
3723 		}
3724 		ret = gem_add_flow_filter(netdev, cmd);
3725 		break;
3726 	case ETHTOOL_SRXCLSRLDEL:
3727 		ret = gem_del_flow_filter(netdev, cmd);
3728 		break;
3729 	default:
3730 		netdev_err(netdev,
3731 			  "Command parameter %d is not supported\n", cmd->cmd);
3732 		ret = -EOPNOTSUPP;
3733 	}
3734 
3735 	return ret;
3736 }
3737 
3738 static const struct ethtool_ops macb_ethtool_ops = {
3739 	.get_regs_len		= macb_get_regs_len,
3740 	.get_regs		= macb_get_regs,
3741 	.get_link		= ethtool_op_get_link,
3742 	.get_ts_info		= ethtool_op_get_ts_info,
3743 	.get_wol		= macb_get_wol,
3744 	.set_wol		= macb_set_wol,
3745 	.get_link_ksettings     = macb_get_link_ksettings,
3746 	.set_link_ksettings     = macb_set_link_ksettings,
3747 	.get_ringparam		= macb_get_ringparam,
3748 	.set_ringparam		= macb_set_ringparam,
3749 };
3750 
3751 static const struct ethtool_ops gem_ethtool_ops = {
3752 	.get_regs_len		= macb_get_regs_len,
3753 	.get_regs		= macb_get_regs,
3754 	.get_wol		= macb_get_wol,
3755 	.set_wol		= macb_set_wol,
3756 	.get_link		= ethtool_op_get_link,
3757 	.get_ts_info		= macb_get_ts_info,
3758 	.get_ethtool_stats	= gem_get_ethtool_stats,
3759 	.get_strings		= gem_get_ethtool_strings,
3760 	.get_sset_count		= gem_get_sset_count,
3761 	.get_link_ksettings     = macb_get_link_ksettings,
3762 	.set_link_ksettings     = macb_set_link_ksettings,
3763 	.get_ringparam		= macb_get_ringparam,
3764 	.set_ringparam		= macb_set_ringparam,
3765 	.get_rxnfc			= gem_get_rxnfc,
3766 	.set_rxnfc			= gem_set_rxnfc,
3767 };
3768 
macb_ioctl(struct net_device * dev,struct ifreq * rq,int cmd)3769 static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
3770 {
3771 	struct macb *bp = netdev_priv(dev);
3772 
3773 	if (!netif_running(dev))
3774 		return -EINVAL;
3775 
3776 	if (bp->ptp_info) {
3777 		switch (cmd) {
3778 		case SIOCSHWTSTAMP:
3779 			return bp->ptp_info->set_hwtst(dev, rq, cmd);
3780 		case SIOCGHWTSTAMP:
3781 			return bp->ptp_info->get_hwtst(dev, rq);
3782 		}
3783 	}
3784 
3785 	return phylink_mii_ioctl(bp->phylink, rq, cmd);
3786 }
3787 
macb_set_txcsum_feature(struct macb * bp,netdev_features_t features)3788 static inline void macb_set_txcsum_feature(struct macb *bp,
3789 					   netdev_features_t features)
3790 {
3791 	u32 val;
3792 
3793 	if (!macb_is_gem(bp))
3794 		return;
3795 
3796 	val = gem_readl(bp, DMACFG);
3797 	if (features & NETIF_F_HW_CSUM)
3798 		val |= GEM_BIT(TXCOEN);
3799 	else
3800 		val &= ~GEM_BIT(TXCOEN);
3801 
3802 	gem_writel(bp, DMACFG, val);
3803 }
3804 
macb_set_rxcsum_feature(struct macb * bp,netdev_features_t features)3805 static inline void macb_set_rxcsum_feature(struct macb *bp,
3806 					   netdev_features_t features)
3807 {
3808 	struct net_device *netdev = bp->dev;
3809 	u32 val;
3810 
3811 	if (!macb_is_gem(bp))
3812 		return;
3813 
3814 	val = gem_readl(bp, NCFGR);
3815 	if ((features & NETIF_F_RXCSUM) && !(netdev->flags & IFF_PROMISC))
3816 		val |= GEM_BIT(RXCOEN);
3817 	else
3818 		val &= ~GEM_BIT(RXCOEN);
3819 
3820 	gem_writel(bp, NCFGR, val);
3821 }
3822 
macb_set_rxflow_feature(struct macb * bp,netdev_features_t features)3823 static inline void macb_set_rxflow_feature(struct macb *bp,
3824 					   netdev_features_t features)
3825 {
3826 	if (!macb_is_gem(bp))
3827 		return;
3828 
3829 	gem_enable_flow_filters(bp, !!(features & NETIF_F_NTUPLE));
3830 }
3831 
macb_set_features(struct net_device * netdev,netdev_features_t features)3832 static int macb_set_features(struct net_device *netdev,
3833 			     netdev_features_t features)
3834 {
3835 	struct macb *bp = netdev_priv(netdev);
3836 	netdev_features_t changed = features ^ netdev->features;
3837 
3838 	/* TX checksum offload */
3839 	if (changed & NETIF_F_HW_CSUM)
3840 		macb_set_txcsum_feature(bp, features);
3841 
3842 	/* RX checksum offload */
3843 	if (changed & NETIF_F_RXCSUM)
3844 		macb_set_rxcsum_feature(bp, features);
3845 
3846 	/* RX Flow Filters */
3847 	if (changed & NETIF_F_NTUPLE)
3848 		macb_set_rxflow_feature(bp, features);
3849 
3850 	return 0;
3851 }
3852 
macb_restore_features(struct macb * bp)3853 static void macb_restore_features(struct macb *bp)
3854 {
3855 	struct net_device *netdev = bp->dev;
3856 	netdev_features_t features = netdev->features;
3857 	struct ethtool_rx_fs_item *item;
3858 
3859 	/* TX checksum offload */
3860 	macb_set_txcsum_feature(bp, features);
3861 
3862 	/* RX checksum offload */
3863 	macb_set_rxcsum_feature(bp, features);
3864 
3865 	/* RX Flow Filters */
3866 	list_for_each_entry(item, &bp->rx_fs_list.list, list)
3867 		gem_prog_cmp_regs(bp, &item->fs);
3868 
3869 	macb_set_rxflow_feature(bp, features);
3870 }
3871 
3872 static const struct net_device_ops macb_netdev_ops = {
3873 	.ndo_open		= macb_open,
3874 	.ndo_stop		= macb_close,
3875 	.ndo_start_xmit		= macb_start_xmit,
3876 	.ndo_set_rx_mode	= macb_set_rx_mode,
3877 	.ndo_get_stats		= macb_get_stats,
3878 	.ndo_eth_ioctl		= macb_ioctl,
3879 	.ndo_validate_addr	= eth_validate_addr,
3880 	.ndo_change_mtu		= macb_change_mtu,
3881 	.ndo_set_mac_address	= macb_set_mac_addr,
3882 #ifdef CONFIG_NET_POLL_CONTROLLER
3883 	.ndo_poll_controller	= macb_poll_controller,
3884 #endif
3885 	.ndo_set_features	= macb_set_features,
3886 	.ndo_features_check	= macb_features_check,
3887 };
3888 
3889 /* Configure peripheral capabilities according to device tree
3890  * and integration options used
3891  */
macb_configure_caps(struct macb * bp,const struct macb_config * dt_conf)3892 static void macb_configure_caps(struct macb *bp,
3893 				const struct macb_config *dt_conf)
3894 {
3895 	u32 dcfg;
3896 
3897 	if (dt_conf)
3898 		bp->caps = dt_conf->caps;
3899 
3900 	if (hw_is_gem(bp->regs, bp->native_io)) {
3901 		bp->caps |= MACB_CAPS_MACB_IS_GEM;
3902 
3903 		dcfg = gem_readl(bp, DCFG1);
3904 		if (GEM_BFEXT(IRQCOR, dcfg) == 0)
3905 			bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE;
3906 		if (GEM_BFEXT(NO_PCS, dcfg) == 0)
3907 			bp->caps |= MACB_CAPS_PCS;
3908 		dcfg = gem_readl(bp, DCFG12);
3909 		if (GEM_BFEXT(HIGH_SPEED, dcfg) == 1)
3910 			bp->caps |= MACB_CAPS_HIGH_SPEED;
3911 		dcfg = gem_readl(bp, DCFG2);
3912 		if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0)
3913 			bp->caps |= MACB_CAPS_FIFO_MODE;
3914 		if (gem_has_ptp(bp)) {
3915 			if (!GEM_BFEXT(TSU, gem_readl(bp, DCFG5)))
3916 				dev_err(&bp->pdev->dev,
3917 					"GEM doesn't support hardware ptp.\n");
3918 			else {
3919 #ifdef CONFIG_MACB_USE_HWSTAMP
3920 				bp->hw_dma_cap |= HW_DMA_CAP_PTP;
3921 				bp->ptp_info = &gem_ptp_info;
3922 #endif
3923 			}
3924 		}
3925 	}
3926 
3927 	dev_dbg(&bp->pdev->dev, "Cadence caps 0x%08x\n", bp->caps);
3928 }
3929 
macb_probe_queues(void __iomem * mem,bool native_io,unsigned int * queue_mask,unsigned int * num_queues)3930 static void macb_probe_queues(void __iomem *mem,
3931 			      bool native_io,
3932 			      unsigned int *queue_mask,
3933 			      unsigned int *num_queues)
3934 {
3935 	*queue_mask = 0x1;
3936 	*num_queues = 1;
3937 
3938 	/* is it macb or gem ?
3939 	 *
3940 	 * We need to read directly from the hardware here because
3941 	 * we are early in the probe process and don't have the
3942 	 * MACB_CAPS_MACB_IS_GEM flag positioned
3943 	 */
3944 	if (!hw_is_gem(mem, native_io))
3945 		return;
3946 
3947 	/* bit 0 is never set but queue 0 always exists */
3948 	*queue_mask |= readl_relaxed(mem + GEM_DCFG6) & 0xff;
3949 	*num_queues = hweight32(*queue_mask);
3950 }
3951 
macb_clks_disable(struct clk * pclk,struct clk * hclk,struct clk * tx_clk,struct clk * rx_clk,struct clk * tsu_clk)3952 static void macb_clks_disable(struct clk *pclk, struct clk *hclk, struct clk *tx_clk,
3953 			      struct clk *rx_clk, struct clk *tsu_clk)
3954 {
3955 	struct clk_bulk_data clks[] = {
3956 		{ .clk = tsu_clk, },
3957 		{ .clk = rx_clk, },
3958 		{ .clk = pclk, },
3959 		{ .clk = hclk, },
3960 		{ .clk = tx_clk },
3961 	};
3962 
3963 	clk_bulk_disable_unprepare(ARRAY_SIZE(clks), clks);
3964 }
3965 
macb_clk_init(struct platform_device * pdev,struct clk ** pclk,struct clk ** hclk,struct clk ** tx_clk,struct clk ** rx_clk,struct clk ** tsu_clk)3966 static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
3967 			 struct clk **hclk, struct clk **tx_clk,
3968 			 struct clk **rx_clk, struct clk **tsu_clk)
3969 {
3970 	struct macb_platform_data *pdata;
3971 	int err;
3972 
3973 	pdata = dev_get_platdata(&pdev->dev);
3974 	if (pdata) {
3975 		*pclk = pdata->pclk;
3976 		*hclk = pdata->hclk;
3977 	} else {
3978 		*pclk = devm_clk_get(&pdev->dev, "pclk");
3979 		*hclk = devm_clk_get(&pdev->dev, "hclk");
3980 	}
3981 
3982 	if (IS_ERR_OR_NULL(*pclk))
3983 		return dev_err_probe(&pdev->dev,
3984 				     IS_ERR(*pclk) ? PTR_ERR(*pclk) : -ENODEV,
3985 				     "failed to get pclk\n");
3986 
3987 	if (IS_ERR_OR_NULL(*hclk))
3988 		return dev_err_probe(&pdev->dev,
3989 				     IS_ERR(*hclk) ? PTR_ERR(*hclk) : -ENODEV,
3990 				     "failed to get hclk\n");
3991 
3992 	*tx_clk = devm_clk_get_optional(&pdev->dev, "tx_clk");
3993 	if (IS_ERR(*tx_clk))
3994 		return PTR_ERR(*tx_clk);
3995 
3996 	*rx_clk = devm_clk_get_optional(&pdev->dev, "rx_clk");
3997 	if (IS_ERR(*rx_clk))
3998 		return PTR_ERR(*rx_clk);
3999 
4000 	*tsu_clk = devm_clk_get_optional(&pdev->dev, "tsu_clk");
4001 	if (IS_ERR(*tsu_clk))
4002 		return PTR_ERR(*tsu_clk);
4003 
4004 	err = clk_prepare_enable(*pclk);
4005 	if (err) {
4006 		dev_err(&pdev->dev, "failed to enable pclk (%d)\n", err);
4007 		return err;
4008 	}
4009 
4010 	err = clk_prepare_enable(*hclk);
4011 	if (err) {
4012 		dev_err(&pdev->dev, "failed to enable hclk (%d)\n", err);
4013 		goto err_disable_pclk;
4014 	}
4015 
4016 	err = clk_prepare_enable(*tx_clk);
4017 	if (err) {
4018 		dev_err(&pdev->dev, "failed to enable tx_clk (%d)\n", err);
4019 		goto err_disable_hclk;
4020 	}
4021 
4022 	err = clk_prepare_enable(*rx_clk);
4023 	if (err) {
4024 		dev_err(&pdev->dev, "failed to enable rx_clk (%d)\n", err);
4025 		goto err_disable_txclk;
4026 	}
4027 
4028 	err = clk_prepare_enable(*tsu_clk);
4029 	if (err) {
4030 		dev_err(&pdev->dev, "failed to enable tsu_clk (%d)\n", err);
4031 		goto err_disable_rxclk;
4032 	}
4033 
4034 	return 0;
4035 
4036 err_disable_rxclk:
4037 	clk_disable_unprepare(*rx_clk);
4038 
4039 err_disable_txclk:
4040 	clk_disable_unprepare(*tx_clk);
4041 
4042 err_disable_hclk:
4043 	clk_disable_unprepare(*hclk);
4044 
4045 err_disable_pclk:
4046 	clk_disable_unprepare(*pclk);
4047 
4048 	return err;
4049 }
4050 
macb_init(struct platform_device * pdev)4051 static int macb_init(struct platform_device *pdev)
4052 {
4053 	struct net_device *dev = platform_get_drvdata(pdev);
4054 	unsigned int hw_q, q;
4055 	struct macb *bp = netdev_priv(dev);
4056 	struct macb_queue *queue;
4057 	int err;
4058 	u32 val, reg;
4059 
4060 	bp->tx_ring_size = DEFAULT_TX_RING_SIZE;
4061 	bp->rx_ring_size = DEFAULT_RX_RING_SIZE;
4062 
4063 	/* set the queue register mapping once for all: queue0 has a special
4064 	 * register mapping but we don't want to test the queue index then
4065 	 * compute the corresponding register offset at run time.
4066 	 */
4067 	for (hw_q = 0, q = 0; hw_q < MACB_MAX_QUEUES; ++hw_q) {
4068 		if (!(bp->queue_mask & (1 << hw_q)))
4069 			continue;
4070 
4071 		queue = &bp->queues[q];
4072 		queue->bp = bp;
4073 		spin_lock_init(&queue->tx_ptr_lock);
4074 		netif_napi_add(dev, &queue->napi_rx, macb_rx_poll);
4075 		netif_napi_add(dev, &queue->napi_tx, macb_tx_poll);
4076 		if (hw_q) {
4077 			queue->ISR  = GEM_ISR(hw_q - 1);
4078 			queue->IER  = GEM_IER(hw_q - 1);
4079 			queue->IDR  = GEM_IDR(hw_q - 1);
4080 			queue->IMR  = GEM_IMR(hw_q - 1);
4081 			queue->TBQP = GEM_TBQP(hw_q - 1);
4082 			queue->RBQP = GEM_RBQP(hw_q - 1);
4083 			queue->RBQS = GEM_RBQS(hw_q - 1);
4084 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
4085 			if (bp->hw_dma_cap & HW_DMA_CAP_64B) {
4086 				queue->TBQPH = GEM_TBQPH(hw_q - 1);
4087 				queue->RBQPH = GEM_RBQPH(hw_q - 1);
4088 			}
4089 #endif
4090 		} else {
4091 			/* queue0 uses legacy registers */
4092 			queue->ISR  = MACB_ISR;
4093 			queue->IER  = MACB_IER;
4094 			queue->IDR  = MACB_IDR;
4095 			queue->IMR  = MACB_IMR;
4096 			queue->TBQP = MACB_TBQP;
4097 			queue->RBQP = MACB_RBQP;
4098 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
4099 			if (bp->hw_dma_cap & HW_DMA_CAP_64B) {
4100 				queue->TBQPH = MACB_TBQPH;
4101 				queue->RBQPH = MACB_RBQPH;
4102 			}
4103 #endif
4104 		}
4105 
4106 		/* get irq: here we use the linux queue index, not the hardware
4107 		 * queue index. the queue irq definitions in the device tree
4108 		 * must remove the optional gaps that could exist in the
4109 		 * hardware queue mask.
4110 		 */
4111 		queue->irq = platform_get_irq(pdev, q);
4112 		err = devm_request_irq(&pdev->dev, queue->irq, macb_interrupt,
4113 				       IRQF_SHARED, dev->name, queue);
4114 		if (err) {
4115 			dev_err(&pdev->dev,
4116 				"Unable to request IRQ %d (error %d)\n",
4117 				queue->irq, err);
4118 			return err;
4119 		}
4120 
4121 		INIT_WORK(&queue->tx_error_task, macb_tx_error_task);
4122 		q++;
4123 	}
4124 
4125 	dev->netdev_ops = &macb_netdev_ops;
4126 
4127 	/* setup appropriated routines according to adapter type */
4128 	if (macb_is_gem(bp)) {
4129 		bp->macbgem_ops.mog_alloc_rx_buffers = gem_alloc_rx_buffers;
4130 		bp->macbgem_ops.mog_free_rx_buffers = gem_free_rx_buffers;
4131 		bp->macbgem_ops.mog_init_rings = gem_init_rings;
4132 		bp->macbgem_ops.mog_rx = gem_rx;
4133 		dev->ethtool_ops = &gem_ethtool_ops;
4134 	} else {
4135 		bp->macbgem_ops.mog_alloc_rx_buffers = macb_alloc_rx_buffers;
4136 		bp->macbgem_ops.mog_free_rx_buffers = macb_free_rx_buffers;
4137 		bp->macbgem_ops.mog_init_rings = macb_init_rings;
4138 		bp->macbgem_ops.mog_rx = macb_rx;
4139 		dev->ethtool_ops = &macb_ethtool_ops;
4140 	}
4141 
4142 	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
4143 
4144 	/* Set features */
4145 	dev->hw_features = NETIF_F_SG;
4146 
4147 	/* Check LSO capability */
4148 	if (GEM_BFEXT(PBUF_LSO, gem_readl(bp, DCFG6)))
4149 		dev->hw_features |= MACB_NETIF_LSO;
4150 
4151 	/* Checksum offload is only available on gem with packet buffer */
4152 	if (macb_is_gem(bp) && !(bp->caps & MACB_CAPS_FIFO_MODE))
4153 		dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
4154 	if (bp->caps & MACB_CAPS_SG_DISABLED)
4155 		dev->hw_features &= ~NETIF_F_SG;
4156 	dev->features = dev->hw_features;
4157 
4158 	/* Check RX Flow Filters support.
4159 	 * Max Rx flows set by availability of screeners & compare regs:
4160 	 * each 4-tuple define requires 1 T2 screener reg + 3 compare regs
4161 	 */
4162 	reg = gem_readl(bp, DCFG8);
4163 	bp->max_tuples = min((GEM_BFEXT(SCR2CMP, reg) / 3),
4164 			GEM_BFEXT(T2SCR, reg));
4165 	INIT_LIST_HEAD(&bp->rx_fs_list.list);
4166 	if (bp->max_tuples > 0) {
4167 		/* also needs one ethtype match to check IPv4 */
4168 		if (GEM_BFEXT(SCR2ETH, reg) > 0) {
4169 			/* program this reg now */
4170 			reg = 0;
4171 			reg = GEM_BFINS(ETHTCMP, (uint16_t)ETH_P_IP, reg);
4172 			gem_writel_n(bp, ETHT, SCRT2_ETHT, reg);
4173 			/* Filtering is supported in hw but don't enable it in kernel now */
4174 			dev->hw_features |= NETIF_F_NTUPLE;
4175 			/* init Rx flow definitions */
4176 			bp->rx_fs_list.count = 0;
4177 			spin_lock_init(&bp->rx_fs_lock);
4178 		} else
4179 			bp->max_tuples = 0;
4180 	}
4181 
4182 	if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) {
4183 		val = 0;
4184 		if (phy_interface_mode_is_rgmii(bp->phy_interface))
4185 			val = bp->usrio->rgmii;
4186 		else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII &&
4187 			 (bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII))
4188 			val = bp->usrio->rmii;
4189 		else if (!(bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII))
4190 			val = bp->usrio->mii;
4191 
4192 		if (bp->caps & MACB_CAPS_USRIO_HAS_CLKEN)
4193 			val |= bp->usrio->refclk;
4194 
4195 		macb_or_gem_writel(bp, USRIO, val);
4196 	}
4197 
4198 	/* Set MII management clock divider */
4199 	val = macb_mdc_clk_div(bp);
4200 	val |= macb_dbw(bp);
4201 	if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII)
4202 		val |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL);
4203 	macb_writel(bp, NCFGR, val);
4204 
4205 	return 0;
4206 }
4207 
4208 static const struct macb_usrio_config macb_default_usrio = {
4209 	.mii = MACB_BIT(MII),
4210 	.rmii = MACB_BIT(RMII),
4211 	.rgmii = GEM_BIT(RGMII),
4212 	.refclk = MACB_BIT(CLKEN),
4213 };
4214 
4215 #if defined(CONFIG_OF)
4216 /* 1518 rounded up */
4217 #define AT91ETHER_MAX_RBUFF_SZ	0x600
4218 /* max number of receive buffers */
4219 #define AT91ETHER_MAX_RX_DESCR	9
4220 
4221 static struct sifive_fu540_macb_mgmt *mgmt;
4222 
at91ether_alloc_coherent(struct macb * lp)4223 static int at91ether_alloc_coherent(struct macb *lp)
4224 {
4225 	struct macb_queue *q = &lp->queues[0];
4226 
4227 	q->rx_ring = dma_alloc_coherent(&lp->pdev->dev,
4228 					 (AT91ETHER_MAX_RX_DESCR *
4229 					  macb_dma_desc_get_size(lp)),
4230 					 &q->rx_ring_dma, GFP_KERNEL);
4231 	if (!q->rx_ring)
4232 		return -ENOMEM;
4233 
4234 	q->rx_buffers = dma_alloc_coherent(&lp->pdev->dev,
4235 					    AT91ETHER_MAX_RX_DESCR *
4236 					    AT91ETHER_MAX_RBUFF_SZ,
4237 					    &q->rx_buffers_dma, GFP_KERNEL);
4238 	if (!q->rx_buffers) {
4239 		dma_free_coherent(&lp->pdev->dev,
4240 				  AT91ETHER_MAX_RX_DESCR *
4241 				  macb_dma_desc_get_size(lp),
4242 				  q->rx_ring, q->rx_ring_dma);
4243 		q->rx_ring = NULL;
4244 		return -ENOMEM;
4245 	}
4246 
4247 	return 0;
4248 }
4249 
at91ether_free_coherent(struct macb * lp)4250 static void at91ether_free_coherent(struct macb *lp)
4251 {
4252 	struct macb_queue *q = &lp->queues[0];
4253 
4254 	if (q->rx_ring) {
4255 		dma_free_coherent(&lp->pdev->dev,
4256 				  AT91ETHER_MAX_RX_DESCR *
4257 				  macb_dma_desc_get_size(lp),
4258 				  q->rx_ring, q->rx_ring_dma);
4259 		q->rx_ring = NULL;
4260 	}
4261 
4262 	if (q->rx_buffers) {
4263 		dma_free_coherent(&lp->pdev->dev,
4264 				  AT91ETHER_MAX_RX_DESCR *
4265 				  AT91ETHER_MAX_RBUFF_SZ,
4266 				  q->rx_buffers, q->rx_buffers_dma);
4267 		q->rx_buffers = NULL;
4268 	}
4269 }
4270 
4271 /* Initialize and start the Receiver and Transmit subsystems */
at91ether_start(struct macb * lp)4272 static int at91ether_start(struct macb *lp)
4273 {
4274 	struct macb_queue *q = &lp->queues[0];
4275 	struct macb_dma_desc *desc;
4276 	dma_addr_t addr;
4277 	u32 ctl;
4278 	int i, ret;
4279 
4280 	ret = at91ether_alloc_coherent(lp);
4281 	if (ret)
4282 		return ret;
4283 
4284 	addr = q->rx_buffers_dma;
4285 	for (i = 0; i < AT91ETHER_MAX_RX_DESCR; i++) {
4286 		desc = macb_rx_desc(q, i);
4287 		macb_set_addr(lp, desc, addr);
4288 		desc->ctrl = 0;
4289 		addr += AT91ETHER_MAX_RBUFF_SZ;
4290 	}
4291 
4292 	/* Set the Wrap bit on the last descriptor */
4293 	desc->addr |= MACB_BIT(RX_WRAP);
4294 
4295 	/* Reset buffer index */
4296 	q->rx_tail = 0;
4297 
4298 	/* Program address of descriptor list in Rx Buffer Queue register */
4299 	macb_writel(lp, RBQP, q->rx_ring_dma);
4300 
4301 	/* Enable Receive and Transmit */
4302 	ctl = macb_readl(lp, NCR);
4303 	macb_writel(lp, NCR, ctl | MACB_BIT(RE) | MACB_BIT(TE));
4304 
4305 	/* Enable MAC interrupts */
4306 	macb_writel(lp, IER, MACB_BIT(RCOMP)	|
4307 			     MACB_BIT(RXUBR)	|
4308 			     MACB_BIT(ISR_TUND)	|
4309 			     MACB_BIT(ISR_RLE)	|
4310 			     MACB_BIT(TCOMP)	|
4311 			     MACB_BIT(ISR_ROVR)	|
4312 			     MACB_BIT(HRESP));
4313 
4314 	return 0;
4315 }
4316 
at91ether_stop(struct macb * lp)4317 static void at91ether_stop(struct macb *lp)
4318 {
4319 	u32 ctl;
4320 
4321 	/* Disable MAC interrupts */
4322 	macb_writel(lp, IDR, MACB_BIT(RCOMP)	|
4323 			     MACB_BIT(RXUBR)	|
4324 			     MACB_BIT(ISR_TUND)	|
4325 			     MACB_BIT(ISR_RLE)	|
4326 			     MACB_BIT(TCOMP)	|
4327 			     MACB_BIT(ISR_ROVR) |
4328 			     MACB_BIT(HRESP));
4329 
4330 	/* Disable Receiver and Transmitter */
4331 	ctl = macb_readl(lp, NCR);
4332 	macb_writel(lp, NCR, ctl & ~(MACB_BIT(TE) | MACB_BIT(RE)));
4333 
4334 	/* Free resources. */
4335 	at91ether_free_coherent(lp);
4336 }
4337 
4338 /* Open the ethernet interface */
at91ether_open(struct net_device * dev)4339 static int at91ether_open(struct net_device *dev)
4340 {
4341 	struct macb *lp = netdev_priv(dev);
4342 	u32 ctl;
4343 	int ret;
4344 
4345 	ret = pm_runtime_resume_and_get(&lp->pdev->dev);
4346 	if (ret < 0)
4347 		return ret;
4348 
4349 	/* Clear internal statistics */
4350 	ctl = macb_readl(lp, NCR);
4351 	macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT));
4352 
4353 	macb_set_hwaddr(lp);
4354 
4355 	ret = at91ether_start(lp);
4356 	if (ret)
4357 		goto pm_exit;
4358 
4359 	ret = macb_phylink_connect(lp);
4360 	if (ret)
4361 		goto stop;
4362 
4363 	netif_start_queue(dev);
4364 
4365 	return 0;
4366 
4367 stop:
4368 	at91ether_stop(lp);
4369 pm_exit:
4370 	pm_runtime_put_sync(&lp->pdev->dev);
4371 	return ret;
4372 }
4373 
4374 /* Close the interface */
at91ether_close(struct net_device * dev)4375 static int at91ether_close(struct net_device *dev)
4376 {
4377 	struct macb *lp = netdev_priv(dev);
4378 
4379 	netif_stop_queue(dev);
4380 
4381 	phylink_stop(lp->phylink);
4382 	phylink_disconnect_phy(lp->phylink);
4383 
4384 	at91ether_stop(lp);
4385 
4386 	return pm_runtime_put(&lp->pdev->dev);
4387 }
4388 
4389 /* Transmit packet */
at91ether_start_xmit(struct sk_buff * skb,struct net_device * dev)4390 static netdev_tx_t at91ether_start_xmit(struct sk_buff *skb,
4391 					struct net_device *dev)
4392 {
4393 	struct macb *lp = netdev_priv(dev);
4394 
4395 	if (macb_readl(lp, TSR) & MACB_BIT(RM9200_BNQ)) {
4396 		int desc = 0;
4397 
4398 		netif_stop_queue(dev);
4399 
4400 		/* Store packet information (to free when Tx completed) */
4401 		lp->rm9200_txq[desc].skb = skb;
4402 		lp->rm9200_txq[desc].size = skb->len;
4403 		lp->rm9200_txq[desc].mapping = dma_map_single(&lp->pdev->dev, skb->data,
4404 							      skb->len, DMA_TO_DEVICE);
4405 		if (dma_mapping_error(&lp->pdev->dev, lp->rm9200_txq[desc].mapping)) {
4406 			dev_kfree_skb_any(skb);
4407 			dev->stats.tx_dropped++;
4408 			netdev_err(dev, "%s: DMA mapping error\n", __func__);
4409 			return NETDEV_TX_OK;
4410 		}
4411 
4412 		/* Set address of the data in the Transmit Address register */
4413 		macb_writel(lp, TAR, lp->rm9200_txq[desc].mapping);
4414 		/* Set length of the packet in the Transmit Control register */
4415 		macb_writel(lp, TCR, skb->len);
4416 
4417 	} else {
4418 		netdev_err(dev, "%s called, but device is busy!\n", __func__);
4419 		return NETDEV_TX_BUSY;
4420 	}
4421 
4422 	return NETDEV_TX_OK;
4423 }
4424 
4425 /* Extract received frame from buffer descriptors and sent to upper layers.
4426  * (Called from interrupt context)
4427  */
at91ether_rx(struct net_device * dev)4428 static void at91ether_rx(struct net_device *dev)
4429 {
4430 	struct macb *lp = netdev_priv(dev);
4431 	struct macb_queue *q = &lp->queues[0];
4432 	struct macb_dma_desc *desc;
4433 	unsigned char *p_recv;
4434 	struct sk_buff *skb;
4435 	unsigned int pktlen;
4436 
4437 	desc = macb_rx_desc(q, q->rx_tail);
4438 	while (desc->addr & MACB_BIT(RX_USED)) {
4439 		p_recv = q->rx_buffers + q->rx_tail * AT91ETHER_MAX_RBUFF_SZ;
4440 		pktlen = MACB_BF(RX_FRMLEN, desc->ctrl);
4441 		skb = netdev_alloc_skb(dev, pktlen + 2);
4442 		if (skb) {
4443 			skb_reserve(skb, 2);
4444 			skb_put_data(skb, p_recv, pktlen);
4445 
4446 			skb->protocol = eth_type_trans(skb, dev);
4447 			dev->stats.rx_packets++;
4448 			dev->stats.rx_bytes += pktlen;
4449 			netif_rx(skb);
4450 		} else {
4451 			dev->stats.rx_dropped++;
4452 		}
4453 
4454 		if (desc->ctrl & MACB_BIT(RX_MHASH_MATCH))
4455 			dev->stats.multicast++;
4456 
4457 		/* reset ownership bit */
4458 		desc->addr &= ~MACB_BIT(RX_USED);
4459 
4460 		/* wrap after last buffer */
4461 		if (q->rx_tail == AT91ETHER_MAX_RX_DESCR - 1)
4462 			q->rx_tail = 0;
4463 		else
4464 			q->rx_tail++;
4465 
4466 		desc = macb_rx_desc(q, q->rx_tail);
4467 	}
4468 }
4469 
4470 /* MAC interrupt handler */
at91ether_interrupt(int irq,void * dev_id)4471 static irqreturn_t at91ether_interrupt(int irq, void *dev_id)
4472 {
4473 	struct net_device *dev = dev_id;
4474 	struct macb *lp = netdev_priv(dev);
4475 	u32 intstatus, ctl;
4476 	unsigned int desc;
4477 
4478 	/* MAC Interrupt Status register indicates what interrupts are pending.
4479 	 * It is automatically cleared once read.
4480 	 */
4481 	intstatus = macb_readl(lp, ISR);
4482 
4483 	/* Receive complete */
4484 	if (intstatus & MACB_BIT(RCOMP))
4485 		at91ether_rx(dev);
4486 
4487 	/* Transmit complete */
4488 	if (intstatus & MACB_BIT(TCOMP)) {
4489 		/* The TCOM bit is set even if the transmission failed */
4490 		if (intstatus & (MACB_BIT(ISR_TUND) | MACB_BIT(ISR_RLE)))
4491 			dev->stats.tx_errors++;
4492 
4493 		desc = 0;
4494 		if (lp->rm9200_txq[desc].skb) {
4495 			dev_consume_skb_irq(lp->rm9200_txq[desc].skb);
4496 			lp->rm9200_txq[desc].skb = NULL;
4497 			dma_unmap_single(&lp->pdev->dev, lp->rm9200_txq[desc].mapping,
4498 					 lp->rm9200_txq[desc].size, DMA_TO_DEVICE);
4499 			dev->stats.tx_packets++;
4500 			dev->stats.tx_bytes += lp->rm9200_txq[desc].size;
4501 		}
4502 		netif_wake_queue(dev);
4503 	}
4504 
4505 	/* Work-around for EMAC Errata section 41.3.1 */
4506 	if (intstatus & MACB_BIT(RXUBR)) {
4507 		ctl = macb_readl(lp, NCR);
4508 		macb_writel(lp, NCR, ctl & ~MACB_BIT(RE));
4509 		wmb();
4510 		macb_writel(lp, NCR, ctl | MACB_BIT(RE));
4511 	}
4512 
4513 	if (intstatus & MACB_BIT(ISR_ROVR))
4514 		netdev_err(dev, "ROVR error\n");
4515 
4516 	return IRQ_HANDLED;
4517 }
4518 
4519 #ifdef CONFIG_NET_POLL_CONTROLLER
at91ether_poll_controller(struct net_device * dev)4520 static void at91ether_poll_controller(struct net_device *dev)
4521 {
4522 	unsigned long flags;
4523 
4524 	local_irq_save(flags);
4525 	at91ether_interrupt(dev->irq, dev);
4526 	local_irq_restore(flags);
4527 }
4528 #endif
4529 
4530 static const struct net_device_ops at91ether_netdev_ops = {
4531 	.ndo_open		= at91ether_open,
4532 	.ndo_stop		= at91ether_close,
4533 	.ndo_start_xmit		= at91ether_start_xmit,
4534 	.ndo_get_stats		= macb_get_stats,
4535 	.ndo_set_rx_mode	= macb_set_rx_mode,
4536 	.ndo_set_mac_address	= eth_mac_addr,
4537 	.ndo_eth_ioctl		= macb_ioctl,
4538 	.ndo_validate_addr	= eth_validate_addr,
4539 #ifdef CONFIG_NET_POLL_CONTROLLER
4540 	.ndo_poll_controller	= at91ether_poll_controller,
4541 #endif
4542 };
4543 
at91ether_clk_init(struct platform_device * pdev,struct clk ** pclk,struct clk ** hclk,struct clk ** tx_clk,struct clk ** rx_clk,struct clk ** tsu_clk)4544 static int at91ether_clk_init(struct platform_device *pdev, struct clk **pclk,
4545 			      struct clk **hclk, struct clk **tx_clk,
4546 			      struct clk **rx_clk, struct clk **tsu_clk)
4547 {
4548 	int err;
4549 
4550 	*hclk = NULL;
4551 	*tx_clk = NULL;
4552 	*rx_clk = NULL;
4553 	*tsu_clk = NULL;
4554 
4555 	*pclk = devm_clk_get(&pdev->dev, "ether_clk");
4556 	if (IS_ERR(*pclk))
4557 		return PTR_ERR(*pclk);
4558 
4559 	err = clk_prepare_enable(*pclk);
4560 	if (err) {
4561 		dev_err(&pdev->dev, "failed to enable pclk (%d)\n", err);
4562 		return err;
4563 	}
4564 
4565 	return 0;
4566 }
4567 
at91ether_init(struct platform_device * pdev)4568 static int at91ether_init(struct platform_device *pdev)
4569 {
4570 	struct net_device *dev = platform_get_drvdata(pdev);
4571 	struct macb *bp = netdev_priv(dev);
4572 	int err;
4573 
4574 	bp->queues[0].bp = bp;
4575 
4576 	dev->netdev_ops = &at91ether_netdev_ops;
4577 	dev->ethtool_ops = &macb_ethtool_ops;
4578 
4579 	err = devm_request_irq(&pdev->dev, dev->irq, at91ether_interrupt,
4580 			       0, dev->name, dev);
4581 	if (err)
4582 		return err;
4583 
4584 	macb_writel(bp, NCR, 0);
4585 
4586 	macb_writel(bp, NCFGR, MACB_BF(CLK, MACB_CLK_DIV32) | MACB_BIT(BIG));
4587 
4588 	return 0;
4589 }
4590 
fu540_macb_tx_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)4591 static unsigned long fu540_macb_tx_recalc_rate(struct clk_hw *hw,
4592 					       unsigned long parent_rate)
4593 {
4594 	return mgmt->rate;
4595 }
4596 
fu540_macb_tx_round_rate(struct clk_hw * hw,unsigned long rate,unsigned long * parent_rate)4597 static long fu540_macb_tx_round_rate(struct clk_hw *hw, unsigned long rate,
4598 				     unsigned long *parent_rate)
4599 {
4600 	if (WARN_ON(rate < 2500000))
4601 		return 2500000;
4602 	else if (rate == 2500000)
4603 		return 2500000;
4604 	else if (WARN_ON(rate < 13750000))
4605 		return 2500000;
4606 	else if (WARN_ON(rate < 25000000))
4607 		return 25000000;
4608 	else if (rate == 25000000)
4609 		return 25000000;
4610 	else if (WARN_ON(rate < 75000000))
4611 		return 25000000;
4612 	else if (WARN_ON(rate < 125000000))
4613 		return 125000000;
4614 	else if (rate == 125000000)
4615 		return 125000000;
4616 
4617 	WARN_ON(rate > 125000000);
4618 
4619 	return 125000000;
4620 }
4621 
fu540_macb_tx_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)4622 static int fu540_macb_tx_set_rate(struct clk_hw *hw, unsigned long rate,
4623 				  unsigned long parent_rate)
4624 {
4625 	rate = fu540_macb_tx_round_rate(hw, rate, &parent_rate);
4626 	if (rate != 125000000)
4627 		iowrite32(1, mgmt->reg);
4628 	else
4629 		iowrite32(0, mgmt->reg);
4630 	mgmt->rate = rate;
4631 
4632 	return 0;
4633 }
4634 
4635 static const struct clk_ops fu540_c000_ops = {
4636 	.recalc_rate = fu540_macb_tx_recalc_rate,
4637 	.round_rate = fu540_macb_tx_round_rate,
4638 	.set_rate = fu540_macb_tx_set_rate,
4639 };
4640 
fu540_c000_clk_init(struct platform_device * pdev,struct clk ** pclk,struct clk ** hclk,struct clk ** tx_clk,struct clk ** rx_clk,struct clk ** tsu_clk)4641 static int fu540_c000_clk_init(struct platform_device *pdev, struct clk **pclk,
4642 			       struct clk **hclk, struct clk **tx_clk,
4643 			       struct clk **rx_clk, struct clk **tsu_clk)
4644 {
4645 	struct clk_init_data init;
4646 	int err = 0;
4647 
4648 	err = macb_clk_init(pdev, pclk, hclk, tx_clk, rx_clk, tsu_clk);
4649 	if (err)
4650 		return err;
4651 
4652 	mgmt = devm_kzalloc(&pdev->dev, sizeof(*mgmt), GFP_KERNEL);
4653 	if (!mgmt) {
4654 		err = -ENOMEM;
4655 		goto err_disable_clks;
4656 	}
4657 
4658 	init.name = "sifive-gemgxl-mgmt";
4659 	init.ops = &fu540_c000_ops;
4660 	init.flags = 0;
4661 	init.num_parents = 0;
4662 
4663 	mgmt->rate = 0;
4664 	mgmt->hw.init = &init;
4665 
4666 	*tx_clk = devm_clk_register(&pdev->dev, &mgmt->hw);
4667 	if (IS_ERR(*tx_clk)) {
4668 		err = PTR_ERR(*tx_clk);
4669 		goto err_disable_clks;
4670 	}
4671 
4672 	err = clk_prepare_enable(*tx_clk);
4673 	if (err) {
4674 		dev_err(&pdev->dev, "failed to enable tx_clk (%u)\n", err);
4675 		*tx_clk = NULL;
4676 		goto err_disable_clks;
4677 	} else {
4678 		dev_info(&pdev->dev, "Registered clk switch '%s'\n", init.name);
4679 	}
4680 
4681 	return 0;
4682 
4683 err_disable_clks:
4684 	macb_clks_disable(*pclk, *hclk, *tx_clk, *rx_clk, *tsu_clk);
4685 
4686 	return err;
4687 }
4688 
fu540_c000_init(struct platform_device * pdev)4689 static int fu540_c000_init(struct platform_device *pdev)
4690 {
4691 	mgmt->reg = devm_platform_ioremap_resource(pdev, 1);
4692 	if (IS_ERR(mgmt->reg))
4693 		return PTR_ERR(mgmt->reg);
4694 
4695 	return macb_init(pdev);
4696 }
4697 
init_reset_optional(struct platform_device * pdev)4698 static int init_reset_optional(struct platform_device *pdev)
4699 {
4700 	struct net_device *dev = platform_get_drvdata(pdev);
4701 	struct macb *bp = netdev_priv(dev);
4702 	int ret;
4703 
4704 	if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) {
4705 		/* Ensure PHY device used in SGMII mode is ready */
4706 		bp->sgmii_phy = devm_phy_optional_get(&pdev->dev, NULL);
4707 
4708 		if (IS_ERR(bp->sgmii_phy))
4709 			return dev_err_probe(&pdev->dev, PTR_ERR(bp->sgmii_phy),
4710 					     "failed to get SGMII PHY\n");
4711 
4712 		ret = phy_init(bp->sgmii_phy);
4713 		if (ret)
4714 			return dev_err_probe(&pdev->dev, ret,
4715 					     "failed to init SGMII PHY\n");
4716 
4717 		ret = zynqmp_pm_is_function_supported(PM_IOCTL, IOCTL_SET_GEM_CONFIG);
4718 		if (!ret) {
4719 			u32 pm_info[2];
4720 
4721 			ret = of_property_read_u32_array(pdev->dev.of_node, "power-domains",
4722 							 pm_info, ARRAY_SIZE(pm_info));
4723 			if (ret) {
4724 				dev_err(&pdev->dev, "Failed to read power management information\n");
4725 				goto err_out_phy_exit;
4726 			}
4727 			ret = zynqmp_pm_set_gem_config(pm_info[1], GEM_CONFIG_FIXED, 0);
4728 			if (ret)
4729 				goto err_out_phy_exit;
4730 
4731 			ret = zynqmp_pm_set_gem_config(pm_info[1], GEM_CONFIG_SGMII_MODE, 1);
4732 			if (ret)
4733 				goto err_out_phy_exit;
4734 		}
4735 
4736 	}
4737 
4738 	/* Fully reset controller at hardware level if mapped in device tree */
4739 	ret = device_reset_optional(&pdev->dev);
4740 	if (ret) {
4741 		phy_exit(bp->sgmii_phy);
4742 		return dev_err_probe(&pdev->dev, ret, "failed to reset controller");
4743 	}
4744 
4745 	ret = macb_init(pdev);
4746 
4747 err_out_phy_exit:
4748 	if (ret)
4749 		phy_exit(bp->sgmii_phy);
4750 
4751 	return ret;
4752 }
4753 
4754 static const struct macb_usrio_config sama7g5_usrio = {
4755 	.mii = 0,
4756 	.rmii = 1,
4757 	.rgmii = 2,
4758 	.refclk = BIT(2),
4759 	.hdfctlen = BIT(6),
4760 };
4761 
4762 static const struct macb_config fu540_c000_config = {
4763 	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO |
4764 		MACB_CAPS_GEM_HAS_PTP,
4765 	.dma_burst_length = 16,
4766 	.clk_init = fu540_c000_clk_init,
4767 	.init = fu540_c000_init,
4768 	.jumbo_max_len = 10240,
4769 	.usrio = &macb_default_usrio,
4770 };
4771 
4772 static const struct macb_config at91sam9260_config = {
4773 	.caps = MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
4774 	.clk_init = macb_clk_init,
4775 	.init = macb_init,
4776 	.usrio = &macb_default_usrio,
4777 };
4778 
4779 static const struct macb_config sama5d3macb_config = {
4780 	.caps = MACB_CAPS_SG_DISABLED |
4781 		MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
4782 	.clk_init = macb_clk_init,
4783 	.init = macb_init,
4784 	.usrio = &macb_default_usrio,
4785 };
4786 
4787 static const struct macb_config pc302gem_config = {
4788 	.caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE,
4789 	.dma_burst_length = 16,
4790 	.clk_init = macb_clk_init,
4791 	.init = macb_init,
4792 	.usrio = &macb_default_usrio,
4793 };
4794 
4795 static const struct macb_config sama5d2_config = {
4796 	.caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
4797 	.dma_burst_length = 16,
4798 	.clk_init = macb_clk_init,
4799 	.init = macb_init,
4800 	.usrio = &macb_default_usrio,
4801 };
4802 
4803 static const struct macb_config sama5d29_config = {
4804 	.caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII | MACB_CAPS_GEM_HAS_PTP,
4805 	.dma_burst_length = 16,
4806 	.clk_init = macb_clk_init,
4807 	.init = macb_init,
4808 	.usrio = &macb_default_usrio,
4809 };
4810 
4811 static const struct macb_config sama5d3_config = {
4812 	.caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE |
4813 		MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII | MACB_CAPS_JUMBO,
4814 	.dma_burst_length = 16,
4815 	.clk_init = macb_clk_init,
4816 	.init = macb_init,
4817 	.jumbo_max_len = 10240,
4818 	.usrio = &macb_default_usrio,
4819 };
4820 
4821 static const struct macb_config sama5d4_config = {
4822 	.caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
4823 	.dma_burst_length = 4,
4824 	.clk_init = macb_clk_init,
4825 	.init = macb_init,
4826 	.usrio = &macb_default_usrio,
4827 };
4828 
4829 static const struct macb_config emac_config = {
4830 	.caps = MACB_CAPS_NEEDS_RSTONUBR | MACB_CAPS_MACB_IS_EMAC,
4831 	.clk_init = at91ether_clk_init,
4832 	.init = at91ether_init,
4833 	.usrio = &macb_default_usrio,
4834 };
4835 
4836 static const struct macb_config np4_config = {
4837 	.caps = MACB_CAPS_USRIO_DISABLED,
4838 	.clk_init = macb_clk_init,
4839 	.init = macb_init,
4840 	.usrio = &macb_default_usrio,
4841 };
4842 
4843 static const struct macb_config zynqmp_config = {
4844 	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE |
4845 		MACB_CAPS_JUMBO |
4846 		MACB_CAPS_GEM_HAS_PTP | MACB_CAPS_BD_RD_PREFETCH,
4847 	.dma_burst_length = 16,
4848 	.clk_init = macb_clk_init,
4849 	.init = init_reset_optional,
4850 	.jumbo_max_len = 10240,
4851 	.usrio = &macb_default_usrio,
4852 };
4853 
4854 static const struct macb_config zynq_config = {
4855 	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_NO_GIGABIT_HALF |
4856 		MACB_CAPS_NEEDS_RSTONUBR,
4857 	.dma_burst_length = 16,
4858 	.clk_init = macb_clk_init,
4859 	.init = macb_init,
4860 	.usrio = &macb_default_usrio,
4861 };
4862 
4863 static const struct macb_config mpfs_config = {
4864 	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE |
4865 		MACB_CAPS_JUMBO |
4866 		MACB_CAPS_GEM_HAS_PTP,
4867 	.dma_burst_length = 16,
4868 	.clk_init = macb_clk_init,
4869 	.init = init_reset_optional,
4870 	.usrio = &macb_default_usrio,
4871 	.max_tx_length = 4040, /* Cadence Erratum 1686 */
4872 	.jumbo_max_len = 4040,
4873 };
4874 
4875 static const struct macb_config sama7g5_gem_config = {
4876 	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_CLK_HW_CHG |
4877 		MACB_CAPS_MIIONRGMII | MACB_CAPS_GEM_HAS_PTP,
4878 	.dma_burst_length = 16,
4879 	.clk_init = macb_clk_init,
4880 	.init = macb_init,
4881 	.usrio = &sama7g5_usrio,
4882 };
4883 
4884 static const struct macb_config sama7g5_emac_config = {
4885 	.caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII |
4886 		MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_MIIONRGMII |
4887 		MACB_CAPS_GEM_HAS_PTP,
4888 	.dma_burst_length = 16,
4889 	.clk_init = macb_clk_init,
4890 	.init = macb_init,
4891 	.usrio = &sama7g5_usrio,
4892 };
4893 
4894 static const struct macb_config versal_config = {
4895 	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO |
4896 		MACB_CAPS_GEM_HAS_PTP | MACB_CAPS_BD_RD_PREFETCH | MACB_CAPS_NEED_TSUCLK,
4897 	.dma_burst_length = 16,
4898 	.clk_init = macb_clk_init,
4899 	.init = init_reset_optional,
4900 	.jumbo_max_len = 10240,
4901 	.usrio = &macb_default_usrio,
4902 };
4903 
4904 static const struct of_device_id macb_dt_ids[] = {
4905 	{ .compatible = "cdns,at91sam9260-macb", .data = &at91sam9260_config },
4906 	{ .compatible = "cdns,macb" },
4907 	{ .compatible = "cdns,np4-macb", .data = &np4_config },
4908 	{ .compatible = "cdns,pc302-gem", .data = &pc302gem_config },
4909 	{ .compatible = "cdns,gem", .data = &pc302gem_config },
4910 	{ .compatible = "cdns,sam9x60-macb", .data = &at91sam9260_config },
4911 	{ .compatible = "atmel,sama5d2-gem", .data = &sama5d2_config },
4912 	{ .compatible = "atmel,sama5d29-gem", .data = &sama5d29_config },
4913 	{ .compatible = "atmel,sama5d3-gem", .data = &sama5d3_config },
4914 	{ .compatible = "atmel,sama5d3-macb", .data = &sama5d3macb_config },
4915 	{ .compatible = "atmel,sama5d4-gem", .data = &sama5d4_config },
4916 	{ .compatible = "cdns,at91rm9200-emac", .data = &emac_config },
4917 	{ .compatible = "cdns,emac", .data = &emac_config },
4918 	{ .compatible = "cdns,zynqmp-gem", .data = &zynqmp_config}, /* deprecated */
4919 	{ .compatible = "cdns,zynq-gem", .data = &zynq_config }, /* deprecated */
4920 	{ .compatible = "sifive,fu540-c000-gem", .data = &fu540_c000_config },
4921 	{ .compatible = "microchip,mpfs-macb", .data = &mpfs_config },
4922 	{ .compatible = "microchip,sama7g5-gem", .data = &sama7g5_gem_config },
4923 	{ .compatible = "microchip,sama7g5-emac", .data = &sama7g5_emac_config },
4924 	{ .compatible = "xlnx,zynqmp-gem", .data = &zynqmp_config},
4925 	{ .compatible = "xlnx,zynq-gem", .data = &zynq_config },
4926 	{ .compatible = "xlnx,versal-gem", .data = &versal_config},
4927 	{ /* sentinel */ }
4928 };
4929 MODULE_DEVICE_TABLE(of, macb_dt_ids);
4930 #endif /* CONFIG_OF */
4931 
4932 static const struct macb_config default_gem_config = {
4933 	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE |
4934 		MACB_CAPS_JUMBO |
4935 		MACB_CAPS_GEM_HAS_PTP,
4936 	.dma_burst_length = 16,
4937 	.clk_init = macb_clk_init,
4938 	.init = macb_init,
4939 	.usrio = &macb_default_usrio,
4940 	.jumbo_max_len = 10240,
4941 };
4942 
macb_probe(struct platform_device * pdev)4943 static int macb_probe(struct platform_device *pdev)
4944 {
4945 	const struct macb_config *macb_config = &default_gem_config;
4946 	int (*clk_init)(struct platform_device *, struct clk **,
4947 			struct clk **, struct clk **,  struct clk **,
4948 			struct clk **) = macb_config->clk_init;
4949 	int (*init)(struct platform_device *) = macb_config->init;
4950 	struct device_node *np = pdev->dev.of_node;
4951 	struct clk *pclk, *hclk = NULL, *tx_clk = NULL, *rx_clk = NULL;
4952 	struct clk *tsu_clk = NULL;
4953 	unsigned int queue_mask, num_queues;
4954 	bool native_io;
4955 	phy_interface_t interface;
4956 	struct net_device *dev;
4957 	struct resource *regs;
4958 	u32 wtrmrk_rst_val;
4959 	void __iomem *mem;
4960 	struct macb *bp;
4961 	int err, val;
4962 
4963 	mem = devm_platform_get_and_ioremap_resource(pdev, 0, &regs);
4964 	if (IS_ERR(mem))
4965 		return PTR_ERR(mem);
4966 
4967 	if (np) {
4968 		const struct of_device_id *match;
4969 
4970 		match = of_match_node(macb_dt_ids, np);
4971 		if (match && match->data) {
4972 			macb_config = match->data;
4973 			clk_init = macb_config->clk_init;
4974 			init = macb_config->init;
4975 		}
4976 	}
4977 
4978 	err = clk_init(pdev, &pclk, &hclk, &tx_clk, &rx_clk, &tsu_clk);
4979 	if (err)
4980 		return err;
4981 
4982 	pm_runtime_set_autosuspend_delay(&pdev->dev, MACB_PM_TIMEOUT);
4983 	pm_runtime_use_autosuspend(&pdev->dev);
4984 	pm_runtime_get_noresume(&pdev->dev);
4985 	pm_runtime_set_active(&pdev->dev);
4986 	pm_runtime_enable(&pdev->dev);
4987 	native_io = hw_is_native_io(mem);
4988 
4989 	macb_probe_queues(mem, native_io, &queue_mask, &num_queues);
4990 	dev = alloc_etherdev_mq(sizeof(*bp), num_queues);
4991 	if (!dev) {
4992 		err = -ENOMEM;
4993 		goto err_disable_clocks;
4994 	}
4995 
4996 	dev->base_addr = regs->start;
4997 
4998 	SET_NETDEV_DEV(dev, &pdev->dev);
4999 
5000 	bp = netdev_priv(dev);
5001 	bp->pdev = pdev;
5002 	bp->dev = dev;
5003 	bp->regs = mem;
5004 	bp->native_io = native_io;
5005 	if (native_io) {
5006 		bp->macb_reg_readl = hw_readl_native;
5007 		bp->macb_reg_writel = hw_writel_native;
5008 	} else {
5009 		bp->macb_reg_readl = hw_readl;
5010 		bp->macb_reg_writel = hw_writel;
5011 	}
5012 	bp->num_queues = num_queues;
5013 	bp->queue_mask = queue_mask;
5014 	if (macb_config)
5015 		bp->dma_burst_length = macb_config->dma_burst_length;
5016 	bp->pclk = pclk;
5017 	bp->hclk = hclk;
5018 	bp->tx_clk = tx_clk;
5019 	bp->rx_clk = rx_clk;
5020 	bp->tsu_clk = tsu_clk;
5021 	if (macb_config)
5022 		bp->jumbo_max_len = macb_config->jumbo_max_len;
5023 
5024 	if (!hw_is_gem(bp->regs, bp->native_io))
5025 		bp->max_tx_length = MACB_MAX_TX_LEN;
5026 	else if (macb_config->max_tx_length)
5027 		bp->max_tx_length = macb_config->max_tx_length;
5028 	else
5029 		bp->max_tx_length = GEM_MAX_TX_LEN;
5030 
5031 	bp->wol = 0;
5032 	if (of_property_read_bool(np, "magic-packet"))
5033 		bp->wol |= MACB_WOL_HAS_MAGIC_PACKET;
5034 	device_set_wakeup_capable(&pdev->dev, bp->wol & MACB_WOL_HAS_MAGIC_PACKET);
5035 
5036 	bp->usrio = macb_config->usrio;
5037 
5038 	/* By default we set to partial store and forward mode for zynqmp.
5039 	 * Disable if not set in devicetree.
5040 	 */
5041 	if (GEM_BFEXT(PBUF_CUTTHRU, gem_readl(bp, DCFG6))) {
5042 		err = of_property_read_u32(bp->pdev->dev.of_node,
5043 					   "cdns,rx-watermark",
5044 					   &bp->rx_watermark);
5045 
5046 		if (!err) {
5047 			/* Disable partial store and forward in case of error or
5048 			 * invalid watermark value
5049 			 */
5050 			wtrmrk_rst_val = (1 << (GEM_BFEXT(RX_PBUF_ADDR, gem_readl(bp, DCFG2)))) - 1;
5051 			if (bp->rx_watermark > wtrmrk_rst_val || !bp->rx_watermark) {
5052 				dev_info(&bp->pdev->dev, "Invalid watermark value\n");
5053 				bp->rx_watermark = 0;
5054 			}
5055 		}
5056 	}
5057 	spin_lock_init(&bp->lock);
5058 
5059 	/* setup capabilities */
5060 	macb_configure_caps(bp, macb_config);
5061 
5062 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
5063 	if (GEM_BFEXT(DAW64, gem_readl(bp, DCFG6))) {
5064 		dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(44));
5065 		bp->hw_dma_cap |= HW_DMA_CAP_64B;
5066 	}
5067 #endif
5068 	platform_set_drvdata(pdev, dev);
5069 
5070 	dev->irq = platform_get_irq(pdev, 0);
5071 	if (dev->irq < 0) {
5072 		err = dev->irq;
5073 		goto err_out_free_netdev;
5074 	}
5075 
5076 	/* MTU range: 68 - 1500 or 10240 */
5077 	dev->min_mtu = GEM_MTU_MIN_SIZE;
5078 	if ((bp->caps & MACB_CAPS_JUMBO) && bp->jumbo_max_len)
5079 		dev->max_mtu = bp->jumbo_max_len - ETH_HLEN - ETH_FCS_LEN;
5080 	else
5081 		dev->max_mtu = ETH_DATA_LEN;
5082 
5083 	if (bp->caps & MACB_CAPS_BD_RD_PREFETCH) {
5084 		val = GEM_BFEXT(RXBD_RDBUFF, gem_readl(bp, DCFG10));
5085 		if (val)
5086 			bp->rx_bd_rd_prefetch = (2 << (val - 1)) *
5087 						macb_dma_desc_get_size(bp);
5088 
5089 		val = GEM_BFEXT(TXBD_RDBUFF, gem_readl(bp, DCFG10));
5090 		if (val)
5091 			bp->tx_bd_rd_prefetch = (2 << (val - 1)) *
5092 						macb_dma_desc_get_size(bp);
5093 	}
5094 
5095 	bp->rx_intr_mask = MACB_RX_INT_FLAGS;
5096 	if (bp->caps & MACB_CAPS_NEEDS_RSTONUBR)
5097 		bp->rx_intr_mask |= MACB_BIT(RXUBR);
5098 
5099 	err = of_get_ethdev_address(np, bp->dev);
5100 	if (err == -EPROBE_DEFER)
5101 		goto err_out_free_netdev;
5102 	else if (err)
5103 		macb_get_hwaddr(bp);
5104 
5105 	err = of_get_phy_mode(np, &interface);
5106 	if (err)
5107 		/* not found in DT, MII by default */
5108 		bp->phy_interface = PHY_INTERFACE_MODE_MII;
5109 	else
5110 		bp->phy_interface = interface;
5111 
5112 	/* IP specific init */
5113 	err = init(pdev);
5114 	if (err)
5115 		goto err_out_free_netdev;
5116 
5117 	err = macb_mii_init(bp);
5118 	if (err)
5119 		goto err_out_phy_exit;
5120 
5121 	netif_carrier_off(dev);
5122 
5123 	err = register_netdev(dev);
5124 	if (err) {
5125 		dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
5126 		goto err_out_unregister_mdio;
5127 	}
5128 
5129 	tasklet_setup(&bp->hresp_err_tasklet, macb_hresp_error_task);
5130 
5131 	netdev_info(dev, "Cadence %s rev 0x%08x at 0x%08lx irq %d (%pM)\n",
5132 		    macb_is_gem(bp) ? "GEM" : "MACB", macb_readl(bp, MID),
5133 		    dev->base_addr, dev->irq, dev->dev_addr);
5134 
5135 	pm_runtime_mark_last_busy(&bp->pdev->dev);
5136 	pm_runtime_put_autosuspend(&bp->pdev->dev);
5137 
5138 	return 0;
5139 
5140 err_out_unregister_mdio:
5141 	mdiobus_unregister(bp->mii_bus);
5142 	mdiobus_free(bp->mii_bus);
5143 
5144 err_out_phy_exit:
5145 	phy_exit(bp->sgmii_phy);
5146 
5147 err_out_free_netdev:
5148 	free_netdev(dev);
5149 
5150 err_disable_clocks:
5151 	macb_clks_disable(pclk, hclk, tx_clk, rx_clk, tsu_clk);
5152 	pm_runtime_disable(&pdev->dev);
5153 	pm_runtime_set_suspended(&pdev->dev);
5154 	pm_runtime_dont_use_autosuspend(&pdev->dev);
5155 
5156 	return err;
5157 }
5158 
macb_remove(struct platform_device * pdev)5159 static int macb_remove(struct platform_device *pdev)
5160 {
5161 	struct net_device *dev;
5162 	struct macb *bp;
5163 
5164 	dev = platform_get_drvdata(pdev);
5165 
5166 	if (dev) {
5167 		bp = netdev_priv(dev);
5168 		phy_exit(bp->sgmii_phy);
5169 		mdiobus_unregister(bp->mii_bus);
5170 		mdiobus_free(bp->mii_bus);
5171 
5172 		unregister_netdev(dev);
5173 		tasklet_kill(&bp->hresp_err_tasklet);
5174 		pm_runtime_disable(&pdev->dev);
5175 		pm_runtime_dont_use_autosuspend(&pdev->dev);
5176 		if (!pm_runtime_suspended(&pdev->dev)) {
5177 			macb_clks_disable(bp->pclk, bp->hclk, bp->tx_clk,
5178 					  bp->rx_clk, bp->tsu_clk);
5179 			pm_runtime_set_suspended(&pdev->dev);
5180 		}
5181 		phylink_destroy(bp->phylink);
5182 		free_netdev(dev);
5183 	}
5184 
5185 	return 0;
5186 }
5187 
macb_suspend(struct device * dev)5188 static int __maybe_unused macb_suspend(struct device *dev)
5189 {
5190 	struct net_device *netdev = dev_get_drvdata(dev);
5191 	struct macb *bp = netdev_priv(netdev);
5192 	struct macb_queue *queue;
5193 	unsigned long flags;
5194 	unsigned int q;
5195 	int err;
5196 
5197 	if (!device_may_wakeup(&bp->dev->dev))
5198 		phy_exit(bp->sgmii_phy);
5199 
5200 	if (!netif_running(netdev))
5201 		return 0;
5202 
5203 	if (bp->wol & MACB_WOL_ENABLED) {
5204 		spin_lock_irqsave(&bp->lock, flags);
5205 		/* Flush all status bits */
5206 		macb_writel(bp, TSR, -1);
5207 		macb_writel(bp, RSR, -1);
5208 		for (q = 0, queue = bp->queues; q < bp->num_queues;
5209 		     ++q, ++queue) {
5210 			/* Disable all interrupts */
5211 			queue_writel(queue, IDR, -1);
5212 			queue_readl(queue, ISR);
5213 			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
5214 				queue_writel(queue, ISR, -1);
5215 		}
5216 		/* Change interrupt handler and
5217 		 * Enable WoL IRQ on queue 0
5218 		 */
5219 		devm_free_irq(dev, bp->queues[0].irq, bp->queues);
5220 		if (macb_is_gem(bp)) {
5221 			err = devm_request_irq(dev, bp->queues[0].irq, gem_wol_interrupt,
5222 					       IRQF_SHARED, netdev->name, bp->queues);
5223 			if (err) {
5224 				dev_err(dev,
5225 					"Unable to request IRQ %d (error %d)\n",
5226 					bp->queues[0].irq, err);
5227 				spin_unlock_irqrestore(&bp->lock, flags);
5228 				return err;
5229 			}
5230 			queue_writel(bp->queues, IER, GEM_BIT(WOL));
5231 			gem_writel(bp, WOL, MACB_BIT(MAG));
5232 		} else {
5233 			err = devm_request_irq(dev, bp->queues[0].irq, macb_wol_interrupt,
5234 					       IRQF_SHARED, netdev->name, bp->queues);
5235 			if (err) {
5236 				dev_err(dev,
5237 					"Unable to request IRQ %d (error %d)\n",
5238 					bp->queues[0].irq, err);
5239 				spin_unlock_irqrestore(&bp->lock, flags);
5240 				return err;
5241 			}
5242 			queue_writel(bp->queues, IER, MACB_BIT(WOL));
5243 			macb_writel(bp, WOL, MACB_BIT(MAG));
5244 		}
5245 		spin_unlock_irqrestore(&bp->lock, flags);
5246 
5247 		enable_irq_wake(bp->queues[0].irq);
5248 	}
5249 
5250 	netif_device_detach(netdev);
5251 	for (q = 0, queue = bp->queues; q < bp->num_queues;
5252 	     ++q, ++queue) {
5253 		napi_disable(&queue->napi_rx);
5254 		napi_disable(&queue->napi_tx);
5255 	}
5256 
5257 	if (!(bp->wol & MACB_WOL_ENABLED)) {
5258 		rtnl_lock();
5259 		phylink_stop(bp->phylink);
5260 		rtnl_unlock();
5261 		spin_lock_irqsave(&bp->lock, flags);
5262 		macb_reset_hw(bp);
5263 		spin_unlock_irqrestore(&bp->lock, flags);
5264 	}
5265 
5266 	if (!(bp->caps & MACB_CAPS_USRIO_DISABLED))
5267 		bp->pm_data.usrio = macb_or_gem_readl(bp, USRIO);
5268 
5269 	if (netdev->hw_features & NETIF_F_NTUPLE)
5270 		bp->pm_data.scrt2 = gem_readl_n(bp, ETHT, SCRT2_ETHT);
5271 
5272 	if (bp->ptp_info)
5273 		bp->ptp_info->ptp_remove(netdev);
5274 	if (!device_may_wakeup(dev))
5275 		pm_runtime_force_suspend(dev);
5276 
5277 	return 0;
5278 }
5279 
macb_resume(struct device * dev)5280 static int __maybe_unused macb_resume(struct device *dev)
5281 {
5282 	struct net_device *netdev = dev_get_drvdata(dev);
5283 	struct macb *bp = netdev_priv(netdev);
5284 	struct macb_queue *queue;
5285 	unsigned long flags;
5286 	unsigned int q;
5287 	int err;
5288 
5289 	if (!device_may_wakeup(&bp->dev->dev))
5290 		phy_init(bp->sgmii_phy);
5291 
5292 	if (!netif_running(netdev))
5293 		return 0;
5294 
5295 	if (!device_may_wakeup(dev))
5296 		pm_runtime_force_resume(dev);
5297 
5298 	if (bp->wol & MACB_WOL_ENABLED) {
5299 		spin_lock_irqsave(&bp->lock, flags);
5300 		/* Disable WoL */
5301 		if (macb_is_gem(bp)) {
5302 			queue_writel(bp->queues, IDR, GEM_BIT(WOL));
5303 			gem_writel(bp, WOL, 0);
5304 		} else {
5305 			queue_writel(bp->queues, IDR, MACB_BIT(WOL));
5306 			macb_writel(bp, WOL, 0);
5307 		}
5308 		/* Clear ISR on queue 0 */
5309 		queue_readl(bp->queues, ISR);
5310 		if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
5311 			queue_writel(bp->queues, ISR, -1);
5312 		/* Replace interrupt handler on queue 0 */
5313 		devm_free_irq(dev, bp->queues[0].irq, bp->queues);
5314 		err = devm_request_irq(dev, bp->queues[0].irq, macb_interrupt,
5315 				       IRQF_SHARED, netdev->name, bp->queues);
5316 		if (err) {
5317 			dev_err(dev,
5318 				"Unable to request IRQ %d (error %d)\n",
5319 				bp->queues[0].irq, err);
5320 			spin_unlock_irqrestore(&bp->lock, flags);
5321 			return err;
5322 		}
5323 		spin_unlock_irqrestore(&bp->lock, flags);
5324 
5325 		disable_irq_wake(bp->queues[0].irq);
5326 
5327 		/* Now make sure we disable phy before moving
5328 		 * to common restore path
5329 		 */
5330 		rtnl_lock();
5331 		phylink_stop(bp->phylink);
5332 		rtnl_unlock();
5333 	}
5334 
5335 	for (q = 0, queue = bp->queues; q < bp->num_queues;
5336 	     ++q, ++queue) {
5337 		napi_enable(&queue->napi_rx);
5338 		napi_enable(&queue->napi_tx);
5339 	}
5340 
5341 	if (netdev->hw_features & NETIF_F_NTUPLE)
5342 		gem_writel_n(bp, ETHT, SCRT2_ETHT, bp->pm_data.scrt2);
5343 
5344 	if (!(bp->caps & MACB_CAPS_USRIO_DISABLED))
5345 		macb_or_gem_writel(bp, USRIO, bp->pm_data.usrio);
5346 
5347 	macb_writel(bp, NCR, MACB_BIT(MPE));
5348 	macb_init_hw(bp);
5349 	macb_set_rx_mode(netdev);
5350 	macb_restore_features(bp);
5351 	rtnl_lock();
5352 
5353 	phylink_start(bp->phylink);
5354 	rtnl_unlock();
5355 
5356 	netif_device_attach(netdev);
5357 	if (bp->ptp_info)
5358 		bp->ptp_info->ptp_init(netdev);
5359 
5360 	return 0;
5361 }
5362 
macb_runtime_suspend(struct device * dev)5363 static int __maybe_unused macb_runtime_suspend(struct device *dev)
5364 {
5365 	struct net_device *netdev = dev_get_drvdata(dev);
5366 	struct macb *bp = netdev_priv(netdev);
5367 
5368 	if (!(device_may_wakeup(dev)))
5369 		macb_clks_disable(bp->pclk, bp->hclk, bp->tx_clk, bp->rx_clk, bp->tsu_clk);
5370 	else if (!(bp->caps & MACB_CAPS_NEED_TSUCLK))
5371 		macb_clks_disable(NULL, NULL, NULL, NULL, bp->tsu_clk);
5372 
5373 	return 0;
5374 }
5375 
macb_runtime_resume(struct device * dev)5376 static int __maybe_unused macb_runtime_resume(struct device *dev)
5377 {
5378 	struct net_device *netdev = dev_get_drvdata(dev);
5379 	struct macb *bp = netdev_priv(netdev);
5380 
5381 	if (!(device_may_wakeup(dev))) {
5382 		clk_prepare_enable(bp->pclk);
5383 		clk_prepare_enable(bp->hclk);
5384 		clk_prepare_enable(bp->tx_clk);
5385 		clk_prepare_enable(bp->rx_clk);
5386 		clk_prepare_enable(bp->tsu_clk);
5387 	} else if (!(bp->caps & MACB_CAPS_NEED_TSUCLK)) {
5388 		clk_prepare_enable(bp->tsu_clk);
5389 	}
5390 
5391 	return 0;
5392 }
5393 
5394 static const struct dev_pm_ops macb_pm_ops = {
5395 	SET_SYSTEM_SLEEP_PM_OPS(macb_suspend, macb_resume)
5396 	SET_RUNTIME_PM_OPS(macb_runtime_suspend, macb_runtime_resume, NULL)
5397 };
5398 
5399 static struct platform_driver macb_driver = {
5400 	.probe		= macb_probe,
5401 	.remove		= macb_remove,
5402 	.driver		= {
5403 		.name		= "macb",
5404 		.of_match_table	= of_match_ptr(macb_dt_ids),
5405 		.pm	= &macb_pm_ops,
5406 	},
5407 };
5408 
5409 module_platform_driver(macb_driver);
5410 
5411 MODULE_LICENSE("GPL");
5412 MODULE_DESCRIPTION("Cadence MACB/GEM Ethernet driver");
5413 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
5414 MODULE_ALIAS("platform:macb");
5415