1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
3  */
4 
5 /* Qualcomm Technologies, Inc. EMAC Gigabit Ethernet Driver */
6 
7 #include <linux/if_ether.h>
8 #include <linux/if_vlan.h>
9 #include <linux/interrupt.h>
10 #include <linux/io.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/of_net.h>
14 #include <linux/of_device.h>
15 #include <linux/phy.h>
16 #include <linux/platform_device.h>
17 #include <linux/acpi.h>
18 #include "emac.h"
19 #include "emac-mac.h"
20 #include "emac-phy.h"
21 #include "emac-sgmii.h"
22 
23 #define EMAC_MSG_DEFAULT (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK |  \
24 		NETIF_MSG_TIMER | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP)
25 
26 #define EMAC_RRD_SIZE					     4
27 /* The RRD size if timestamping is enabled: */
28 #define EMAC_TS_RRD_SIZE				     6
29 #define EMAC_TPD_SIZE					     4
30 #define EMAC_RFD_SIZE					     2
31 
32 #define REG_MAC_RX_STATUS_BIN		 EMAC_RXMAC_STATC_REG0
33 #define REG_MAC_RX_STATUS_END		EMAC_RXMAC_STATC_REG22
34 #define REG_MAC_TX_STATUS_BIN		 EMAC_TXMAC_STATC_REG0
35 #define REG_MAC_TX_STATUS_END		EMAC_TXMAC_STATC_REG24
36 
37 #define RXQ0_NUM_RFD_PREF_DEF				     8
38 #define TXQ0_NUM_TPD_PREF_DEF				     5
39 
40 #define EMAC_PREAMBLE_DEF				     7
41 
42 #define DMAR_DLY_CNT_DEF				    15
43 #define DMAW_DLY_CNT_DEF				     4
44 
45 #define IMR_NORMAL_MASK		(ISR_ERROR | ISR_OVER | ISR_TX_PKT)
46 
47 #define ISR_TX_PKT      (\
48 	TX_PKT_INT      |\
49 	TX_PKT_INT1     |\
50 	TX_PKT_INT2     |\
51 	TX_PKT_INT3)
52 
53 #define ISR_OVER        (\
54 	RFD0_UR_INT     |\
55 	RFD1_UR_INT     |\
56 	RFD2_UR_INT     |\
57 	RFD3_UR_INT     |\
58 	RFD4_UR_INT     |\
59 	RXF_OF_INT      |\
60 	TXF_UR_INT)
61 
62 #define ISR_ERROR       (\
63 	DMAR_TO_INT     |\
64 	DMAW_TO_INT     |\
65 	TXQ_TO_INT)
66 
67 /* in sync with enum emac_clk_id */
68 static const char * const emac_clk_name[] = {
69 	"axi_clk", "cfg_ahb_clk", "high_speed_clk", "mdio_clk", "tx_clk",
70 	"rx_clk", "sys_clk"
71 };
72 
73 void emac_reg_update32(void __iomem *addr, u32 mask, u32 val)
74 {
75 	u32 data = readl(addr);
76 
77 	writel(((data & ~mask) | val), addr);
78 }
79 
80 /* reinitialize */
81 int emac_reinit_locked(struct emac_adapter *adpt)
82 {
83 	int ret;
84 
85 	mutex_lock(&adpt->reset_lock);
86 
87 	emac_mac_down(adpt);
88 	emac_sgmii_reset(adpt);
89 	ret = emac_mac_up(adpt);
90 
91 	mutex_unlock(&adpt->reset_lock);
92 
93 	return ret;
94 }
95 
96 /* NAPI */
97 static int emac_napi_rtx(struct napi_struct *napi, int budget)
98 {
99 	struct emac_rx_queue *rx_q =
100 		container_of(napi, struct emac_rx_queue, napi);
101 	struct emac_adapter *adpt = netdev_priv(rx_q->netdev);
102 	struct emac_irq *irq = rx_q->irq;
103 	int work_done = 0;
104 
105 	emac_mac_rx_process(adpt, rx_q, &work_done, budget);
106 
107 	if (work_done < budget) {
108 		napi_complete_done(napi, work_done);
109 
110 		irq->mask |= rx_q->intr;
111 		writel(irq->mask, adpt->base + EMAC_INT_MASK);
112 	}
113 
114 	return work_done;
115 }
116 
117 /* Transmit the packet */
118 static netdev_tx_t emac_start_xmit(struct sk_buff *skb,
119 				   struct net_device *netdev)
120 {
121 	struct emac_adapter *adpt = netdev_priv(netdev);
122 
123 	return emac_mac_tx_buf_send(adpt, &adpt->tx_q, skb);
124 }
125 
126 static irqreturn_t emac_isr(int _irq, void *data)
127 {
128 	struct emac_irq *irq = data;
129 	struct emac_adapter *adpt =
130 		container_of(irq, struct emac_adapter, irq);
131 	struct emac_rx_queue *rx_q = &adpt->rx_q;
132 	u32 isr, status;
133 
134 	/* disable the interrupt */
135 	writel(0, adpt->base + EMAC_INT_MASK);
136 
137 	isr = readl_relaxed(adpt->base + EMAC_INT_STATUS);
138 
139 	status = isr & irq->mask;
140 	if (status == 0)
141 		goto exit;
142 
143 	if (status & ISR_ERROR) {
144 		net_err_ratelimited("%s: error interrupt 0x%lx\n",
145 				    adpt->netdev->name, status & ISR_ERROR);
146 		/* reset MAC */
147 		schedule_work(&adpt->work_thread);
148 	}
149 
150 	/* Schedule the napi for receive queue with interrupt
151 	 * status bit set
152 	 */
153 	if (status & rx_q->intr) {
154 		if (napi_schedule_prep(&rx_q->napi)) {
155 			irq->mask &= ~rx_q->intr;
156 			__napi_schedule(&rx_q->napi);
157 		}
158 	}
159 
160 	if (status & TX_PKT_INT)
161 		emac_mac_tx_process(adpt, &adpt->tx_q);
162 
163 	if (status & ISR_OVER)
164 		net_warn_ratelimited("%s: TX/RX overflow interrupt\n",
165 				     adpt->netdev->name);
166 
167 exit:
168 	/* enable the interrupt */
169 	writel(irq->mask, adpt->base + EMAC_INT_MASK);
170 
171 	return IRQ_HANDLED;
172 }
173 
174 /* Configure VLAN tag strip/insert feature */
175 static int emac_set_features(struct net_device *netdev,
176 			     netdev_features_t features)
177 {
178 	netdev_features_t changed = features ^ netdev->features;
179 	struct emac_adapter *adpt = netdev_priv(netdev);
180 
181 	/* We only need to reprogram the hardware if the VLAN tag features
182 	 * have changed, and if it's already running.
183 	 */
184 	if (!(changed & (NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX)))
185 		return 0;
186 
187 	if (!netif_running(netdev))
188 		return 0;
189 
190 	/* emac_mac_mode_config() uses netdev->features to configure the EMAC,
191 	 * so make sure it's set first.
192 	 */
193 	netdev->features = features;
194 
195 	return emac_reinit_locked(adpt);
196 }
197 
198 /* Configure Multicast and Promiscuous modes */
199 static void emac_rx_mode_set(struct net_device *netdev)
200 {
201 	struct emac_adapter *adpt = netdev_priv(netdev);
202 	struct netdev_hw_addr *ha;
203 
204 	emac_mac_mode_config(adpt);
205 
206 	/* update multicast address filtering */
207 	emac_mac_multicast_addr_clear(adpt);
208 	netdev_for_each_mc_addr(ha, netdev)
209 		emac_mac_multicast_addr_set(adpt, ha->addr);
210 }
211 
212 /* Change the Maximum Transfer Unit (MTU) */
213 static int emac_change_mtu(struct net_device *netdev, int new_mtu)
214 {
215 	struct emac_adapter *adpt = netdev_priv(netdev);
216 
217 	netif_dbg(adpt, hw, adpt->netdev,
218 		  "changing MTU from %d to %d\n", netdev->mtu,
219 		  new_mtu);
220 	netdev->mtu = new_mtu;
221 
222 	if (netif_running(netdev))
223 		return emac_reinit_locked(adpt);
224 
225 	return 0;
226 }
227 
228 /* Called when the network interface is made active */
229 static int emac_open(struct net_device *netdev)
230 {
231 	struct emac_adapter *adpt = netdev_priv(netdev);
232 	struct emac_irq	*irq = &adpt->irq;
233 	int ret;
234 
235 	ret = request_irq(irq->irq, emac_isr, 0, "emac-core0", irq);
236 	if (ret) {
237 		netdev_err(adpt->netdev, "could not request emac-core0 irq\n");
238 		return ret;
239 	}
240 
241 	/* allocate rx/tx dma buffer & descriptors */
242 	ret = emac_mac_rx_tx_rings_alloc_all(adpt);
243 	if (ret) {
244 		netdev_err(adpt->netdev, "error allocating rx/tx rings\n");
245 		free_irq(irq->irq, irq);
246 		return ret;
247 	}
248 
249 	ret = emac_sgmii_open(adpt);
250 	if (ret) {
251 		emac_mac_rx_tx_rings_free_all(adpt);
252 		free_irq(irq->irq, irq);
253 		return ret;
254 	}
255 
256 	ret = emac_mac_up(adpt);
257 	if (ret) {
258 		emac_mac_rx_tx_rings_free_all(adpt);
259 		free_irq(irq->irq, irq);
260 		emac_sgmii_close(adpt);
261 		return ret;
262 	}
263 
264 	return 0;
265 }
266 
267 /* Called when the network interface is disabled */
268 static int emac_close(struct net_device *netdev)
269 {
270 	struct emac_adapter *adpt = netdev_priv(netdev);
271 
272 	mutex_lock(&adpt->reset_lock);
273 
274 	emac_sgmii_close(adpt);
275 	emac_mac_down(adpt);
276 	emac_mac_rx_tx_rings_free_all(adpt);
277 
278 	free_irq(adpt->irq.irq, &adpt->irq);
279 
280 	mutex_unlock(&adpt->reset_lock);
281 
282 	return 0;
283 }
284 
285 /* Respond to a TX hang */
286 static void emac_tx_timeout(struct net_device *netdev, unsigned int txqueue)
287 {
288 	struct emac_adapter *adpt = netdev_priv(netdev);
289 
290 	schedule_work(&adpt->work_thread);
291 }
292 
293 /**
294  * emac_update_hw_stats - read the EMAC stat registers
295  * @adpt: pointer to adapter struct
296  *
297  * Reads the stats registers and write the values to adpt->stats.
298  *
299  * adpt->stats.lock must be held while calling this function,
300  * and while reading from adpt->stats.
301  */
302 void emac_update_hw_stats(struct emac_adapter *adpt)
303 {
304 	struct emac_stats *stats = &adpt->stats;
305 	u64 *stats_itr = &adpt->stats.rx_ok;
306 	void __iomem *base = adpt->base;
307 	unsigned int addr;
308 
309 	addr = REG_MAC_RX_STATUS_BIN;
310 	while (addr <= REG_MAC_RX_STATUS_END) {
311 		*stats_itr += readl_relaxed(base + addr);
312 		stats_itr++;
313 		addr += sizeof(u32);
314 	}
315 
316 	/* additional rx status */
317 	stats->rx_crc_align += readl_relaxed(base + EMAC_RXMAC_STATC_REG23);
318 	stats->rx_jabbers += readl_relaxed(base + EMAC_RXMAC_STATC_REG24);
319 
320 	/* update tx status */
321 	addr = REG_MAC_TX_STATUS_BIN;
322 	stats_itr = &stats->tx_ok;
323 
324 	while (addr <= REG_MAC_TX_STATUS_END) {
325 		*stats_itr += readl_relaxed(base + addr);
326 		stats_itr++;
327 		addr += sizeof(u32);
328 	}
329 
330 	/* additional tx status */
331 	stats->tx_col += readl_relaxed(base + EMAC_TXMAC_STATC_REG25);
332 }
333 
334 /* Provide network statistics info for the interface */
335 static void emac_get_stats64(struct net_device *netdev,
336 			     struct rtnl_link_stats64 *net_stats)
337 {
338 	struct emac_adapter *adpt = netdev_priv(netdev);
339 	struct emac_stats *stats = &adpt->stats;
340 
341 	spin_lock(&stats->lock);
342 
343 	emac_update_hw_stats(adpt);
344 
345 	/* return parsed statistics */
346 	net_stats->rx_packets = stats->rx_ok;
347 	net_stats->tx_packets = stats->tx_ok;
348 	net_stats->rx_bytes = stats->rx_byte_cnt;
349 	net_stats->tx_bytes = stats->tx_byte_cnt;
350 	net_stats->multicast = stats->rx_mcast;
351 	net_stats->collisions = stats->tx_1_col + stats->tx_2_col * 2 +
352 				stats->tx_late_col + stats->tx_abort_col;
353 
354 	net_stats->rx_errors = stats->rx_frag + stats->rx_fcs_err +
355 			       stats->rx_len_err + stats->rx_sz_ov +
356 			       stats->rx_align_err;
357 	net_stats->rx_fifo_errors = stats->rx_rxf_ov;
358 	net_stats->rx_length_errors = stats->rx_len_err;
359 	net_stats->rx_crc_errors = stats->rx_fcs_err;
360 	net_stats->rx_frame_errors = stats->rx_align_err;
361 	net_stats->rx_over_errors = stats->rx_rxf_ov;
362 	net_stats->rx_missed_errors = stats->rx_rxf_ov;
363 
364 	net_stats->tx_errors = stats->tx_late_col + stats->tx_abort_col +
365 			       stats->tx_underrun + stats->tx_trunc;
366 	net_stats->tx_fifo_errors = stats->tx_underrun;
367 	net_stats->tx_aborted_errors = stats->tx_abort_col;
368 	net_stats->tx_window_errors = stats->tx_late_col;
369 
370 	spin_unlock(&stats->lock);
371 }
372 
373 static const struct net_device_ops emac_netdev_ops = {
374 	.ndo_open		= emac_open,
375 	.ndo_stop		= emac_close,
376 	.ndo_validate_addr	= eth_validate_addr,
377 	.ndo_start_xmit		= emac_start_xmit,
378 	.ndo_set_mac_address	= eth_mac_addr,
379 	.ndo_change_mtu		= emac_change_mtu,
380 	.ndo_eth_ioctl		= phy_do_ioctl_running,
381 	.ndo_tx_timeout		= emac_tx_timeout,
382 	.ndo_get_stats64	= emac_get_stats64,
383 	.ndo_set_features       = emac_set_features,
384 	.ndo_set_rx_mode        = emac_rx_mode_set,
385 };
386 
387 /* Watchdog task routine, called to reinitialize the EMAC */
388 static void emac_work_thread(struct work_struct *work)
389 {
390 	struct emac_adapter *adpt =
391 		container_of(work, struct emac_adapter, work_thread);
392 
393 	emac_reinit_locked(adpt);
394 }
395 
396 /* Initialize various data structures  */
397 static void emac_init_adapter(struct emac_adapter *adpt)
398 {
399 	u32 reg;
400 
401 	adpt->rrd_size = EMAC_RRD_SIZE;
402 	adpt->tpd_size = EMAC_TPD_SIZE;
403 	adpt->rfd_size = EMAC_RFD_SIZE;
404 
405 	/* descriptors */
406 	adpt->tx_desc_cnt = EMAC_DEF_TX_DESCS;
407 	adpt->rx_desc_cnt = EMAC_DEF_RX_DESCS;
408 
409 	/* dma */
410 	adpt->dma_order = emac_dma_ord_out;
411 	adpt->dmar_block = emac_dma_req_4096;
412 	adpt->dmaw_block = emac_dma_req_128;
413 	adpt->dmar_dly_cnt = DMAR_DLY_CNT_DEF;
414 	adpt->dmaw_dly_cnt = DMAW_DLY_CNT_DEF;
415 	adpt->tpd_burst = TXQ0_NUM_TPD_PREF_DEF;
416 	adpt->rfd_burst = RXQ0_NUM_RFD_PREF_DEF;
417 
418 	/* irq moderator */
419 	reg = ((EMAC_DEF_RX_IRQ_MOD >> 1) << IRQ_MODERATOR2_INIT_SHFT) |
420 	      ((EMAC_DEF_TX_IRQ_MOD >> 1) << IRQ_MODERATOR_INIT_SHFT);
421 	adpt->irq_mod = reg;
422 
423 	/* others */
424 	adpt->preamble = EMAC_PREAMBLE_DEF;
425 
426 	/* default to automatic flow control */
427 	adpt->automatic = true;
428 
429 	/* Disable single-pause-frame mode by default */
430 	adpt->single_pause_mode = false;
431 }
432 
433 /* Get the clock */
434 static int emac_clks_get(struct platform_device *pdev,
435 			 struct emac_adapter *adpt)
436 {
437 	unsigned int i;
438 
439 	for (i = 0; i < EMAC_CLK_CNT; i++) {
440 		struct clk *clk = devm_clk_get(&pdev->dev, emac_clk_name[i]);
441 
442 		if (IS_ERR(clk)) {
443 			dev_err(&pdev->dev,
444 				"could not claim clock %s (error=%li)\n",
445 				emac_clk_name[i], PTR_ERR(clk));
446 
447 			return PTR_ERR(clk);
448 		}
449 
450 		adpt->clk[i] = clk;
451 	}
452 
453 	return 0;
454 }
455 
456 /* Initialize clocks */
457 static int emac_clks_phase1_init(struct platform_device *pdev,
458 				 struct emac_adapter *adpt)
459 {
460 	int ret;
461 
462 	/* On ACPI platforms, clocks are controlled by firmware and/or
463 	 * ACPI, not by drivers.
464 	 */
465 	if (has_acpi_companion(&pdev->dev))
466 		return 0;
467 
468 	ret = emac_clks_get(pdev, adpt);
469 	if (ret)
470 		return ret;
471 
472 	ret = clk_prepare_enable(adpt->clk[EMAC_CLK_AXI]);
473 	if (ret)
474 		return ret;
475 
476 	ret = clk_prepare_enable(adpt->clk[EMAC_CLK_CFG_AHB]);
477 	if (ret)
478 		goto disable_clk_axi;
479 
480 	ret = clk_set_rate(adpt->clk[EMAC_CLK_HIGH_SPEED], 19200000);
481 	if (ret)
482 		goto disable_clk_cfg_ahb;
483 
484 	ret = clk_prepare_enable(adpt->clk[EMAC_CLK_HIGH_SPEED]);
485 	if (ret)
486 		goto disable_clk_cfg_ahb;
487 
488 	return 0;
489 
490 disable_clk_cfg_ahb:
491 	clk_disable_unprepare(adpt->clk[EMAC_CLK_CFG_AHB]);
492 disable_clk_axi:
493 	clk_disable_unprepare(adpt->clk[EMAC_CLK_AXI]);
494 
495 	return ret;
496 }
497 
498 /* Enable clocks; needs emac_clks_phase1_init to be called before */
499 static int emac_clks_phase2_init(struct platform_device *pdev,
500 				 struct emac_adapter *adpt)
501 {
502 	int ret;
503 
504 	if (has_acpi_companion(&pdev->dev))
505 		return 0;
506 
507 	ret = clk_set_rate(adpt->clk[EMAC_CLK_TX], 125000000);
508 	if (ret)
509 		return ret;
510 
511 	ret = clk_prepare_enable(adpt->clk[EMAC_CLK_TX]);
512 	if (ret)
513 		return ret;
514 
515 	ret = clk_set_rate(adpt->clk[EMAC_CLK_HIGH_SPEED], 125000000);
516 	if (ret)
517 		return ret;
518 
519 	ret = clk_set_rate(adpt->clk[EMAC_CLK_MDIO], 25000000);
520 	if (ret)
521 		return ret;
522 
523 	ret = clk_prepare_enable(adpt->clk[EMAC_CLK_MDIO]);
524 	if (ret)
525 		return ret;
526 
527 	ret = clk_prepare_enable(adpt->clk[EMAC_CLK_RX]);
528 	if (ret)
529 		return ret;
530 
531 	return clk_prepare_enable(adpt->clk[EMAC_CLK_SYS]);
532 }
533 
534 static void emac_clks_teardown(struct emac_adapter *adpt)
535 {
536 
537 	unsigned int i;
538 
539 	for (i = 0; i < EMAC_CLK_CNT; i++)
540 		clk_disable_unprepare(adpt->clk[i]);
541 }
542 
543 /* Get the resources */
544 static int emac_probe_resources(struct platform_device *pdev,
545 				struct emac_adapter *adpt)
546 {
547 	struct net_device *netdev = adpt->netdev;
548 	int ret = 0;
549 
550 	/* get mac address */
551 	if (device_get_ethdev_address(&pdev->dev, netdev))
552 		eth_hw_addr_random(netdev);
553 
554 	/* Core 0 interrupt */
555 	ret = platform_get_irq(pdev, 0);
556 	if (ret < 0)
557 		return ret;
558 	adpt->irq.irq = ret;
559 
560 	/* base register address */
561 	adpt->base = devm_platform_ioremap_resource(pdev, 0);
562 	if (IS_ERR(adpt->base))
563 		return PTR_ERR(adpt->base);
564 
565 	/* CSR register address */
566 	adpt->csr = devm_platform_ioremap_resource(pdev, 1);
567 	if (IS_ERR(adpt->csr))
568 		return PTR_ERR(adpt->csr);
569 
570 	netdev->base_addr = (unsigned long)adpt->base;
571 
572 	return 0;
573 }
574 
575 static const struct of_device_id emac_dt_match[] = {
576 	{
577 		.compatible = "qcom,fsm9900-emac",
578 	},
579 	{}
580 };
581 MODULE_DEVICE_TABLE(of, emac_dt_match);
582 
583 #if IS_ENABLED(CONFIG_ACPI)
584 static const struct acpi_device_id emac_acpi_match[] = {
585 	{
586 		.id = "QCOM8070",
587 	},
588 	{}
589 };
590 MODULE_DEVICE_TABLE(acpi, emac_acpi_match);
591 #endif
592 
593 static int emac_probe(struct platform_device *pdev)
594 {
595 	struct net_device *netdev;
596 	struct emac_adapter *adpt;
597 	struct emac_sgmii *phy;
598 	u16 devid, revid;
599 	u32 reg;
600 	int ret;
601 
602 	/* The TPD buffer address is limited to:
603 	 * 1. PTP:	45bits. (Driver doesn't support yet.)
604 	 * 2. NON-PTP:	46bits.
605 	 */
606 	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(46));
607 	if (ret) {
608 		dev_err(&pdev->dev, "could not set DMA mask\n");
609 		return ret;
610 	}
611 
612 	netdev = alloc_etherdev(sizeof(struct emac_adapter));
613 	if (!netdev)
614 		return -ENOMEM;
615 
616 	dev_set_drvdata(&pdev->dev, netdev);
617 	SET_NETDEV_DEV(netdev, &pdev->dev);
618 	emac_set_ethtool_ops(netdev);
619 
620 	adpt = netdev_priv(netdev);
621 	adpt->netdev = netdev;
622 	adpt->msg_enable = EMAC_MSG_DEFAULT;
623 
624 	phy = &adpt->phy;
625 	atomic_set(&phy->decode_error_count, 0);
626 
627 	mutex_init(&adpt->reset_lock);
628 	spin_lock_init(&adpt->stats.lock);
629 
630 	adpt->irq.mask = RX_PKT_INT0 | IMR_NORMAL_MASK;
631 
632 	ret = emac_probe_resources(pdev, adpt);
633 	if (ret)
634 		goto err_undo_netdev;
635 
636 	/* initialize clocks */
637 	ret = emac_clks_phase1_init(pdev, adpt);
638 	if (ret) {
639 		dev_err(&pdev->dev, "could not initialize clocks\n");
640 		goto err_undo_netdev;
641 	}
642 
643 	netdev->watchdog_timeo = EMAC_WATCHDOG_TIME;
644 	netdev->irq = adpt->irq.irq;
645 
646 	netdev->netdev_ops = &emac_netdev_ops;
647 
648 	emac_init_adapter(adpt);
649 
650 	/* init external phy */
651 	ret = emac_phy_config(pdev, adpt);
652 	if (ret)
653 		goto err_undo_clocks;
654 
655 	/* init internal sgmii phy */
656 	ret = emac_sgmii_config(pdev, adpt);
657 	if (ret)
658 		goto err_undo_mdiobus;
659 
660 	/* enable clocks */
661 	ret = emac_clks_phase2_init(pdev, adpt);
662 	if (ret) {
663 		dev_err(&pdev->dev, "could not initialize clocks\n");
664 		goto err_undo_mdiobus;
665 	}
666 
667 	/* set hw features */
668 	netdev->features = NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM |
669 			NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_HW_VLAN_CTAG_RX |
670 			NETIF_F_HW_VLAN_CTAG_TX;
671 	netdev->hw_features = netdev->features;
672 
673 	netdev->vlan_features |= NETIF_F_SG | NETIF_F_HW_CSUM |
674 				 NETIF_F_TSO | NETIF_F_TSO6;
675 
676 	/* MTU range: 46 - 9194 */
677 	netdev->min_mtu = EMAC_MIN_ETH_FRAME_SIZE -
678 			  (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
679 	netdev->max_mtu = EMAC_MAX_ETH_FRAME_SIZE -
680 			  (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
681 
682 	INIT_WORK(&adpt->work_thread, emac_work_thread);
683 
684 	/* Initialize queues */
685 	emac_mac_rx_tx_ring_init_all(pdev, adpt);
686 
687 	netif_napi_add(netdev, &adpt->rx_q.napi, emac_napi_rtx);
688 
689 	ret = register_netdev(netdev);
690 	if (ret) {
691 		dev_err(&pdev->dev, "could not register net device\n");
692 		goto err_undo_napi;
693 	}
694 
695 	reg =  readl_relaxed(adpt->base + EMAC_DMA_MAS_CTRL);
696 	devid = (reg & DEV_ID_NUM_BMSK)  >> DEV_ID_NUM_SHFT;
697 	revid = (reg & DEV_REV_NUM_BMSK) >> DEV_REV_NUM_SHFT;
698 	reg = readl_relaxed(adpt->base + EMAC_CORE_HW_VERSION);
699 
700 	netif_info(adpt, probe, netdev,
701 		   "hardware id %d.%d, hardware version %d.%d.%d\n",
702 		   devid, revid,
703 		   (reg & MAJOR_BMSK) >> MAJOR_SHFT,
704 		   (reg & MINOR_BMSK) >> MINOR_SHFT,
705 		   (reg & STEP_BMSK)  >> STEP_SHFT);
706 
707 	return 0;
708 
709 err_undo_napi:
710 	netif_napi_del(&adpt->rx_q.napi);
711 err_undo_mdiobus:
712 	put_device(&adpt->phydev->mdio.dev);
713 	mdiobus_unregister(adpt->mii_bus);
714 err_undo_clocks:
715 	emac_clks_teardown(adpt);
716 err_undo_netdev:
717 	free_netdev(netdev);
718 
719 	return ret;
720 }
721 
722 static int emac_remove(struct platform_device *pdev)
723 {
724 	struct net_device *netdev = dev_get_drvdata(&pdev->dev);
725 	struct emac_adapter *adpt = netdev_priv(netdev);
726 
727 	unregister_netdev(netdev);
728 	netif_napi_del(&adpt->rx_q.napi);
729 
730 	emac_clks_teardown(adpt);
731 
732 	put_device(&adpt->phydev->mdio.dev);
733 	mdiobus_unregister(adpt->mii_bus);
734 
735 	if (adpt->phy.digital)
736 		iounmap(adpt->phy.digital);
737 	iounmap(adpt->phy.base);
738 
739 	free_netdev(netdev);
740 
741 	return 0;
742 }
743 
744 static void emac_shutdown(struct platform_device *pdev)
745 {
746 	struct net_device *netdev = dev_get_drvdata(&pdev->dev);
747 	struct emac_adapter *adpt = netdev_priv(netdev);
748 
749 	if (netdev->flags & IFF_UP) {
750 		/* Closing the SGMII turns off its interrupts */
751 		emac_sgmii_close(adpt);
752 
753 		/* Resetting the MAC turns off all DMA and its interrupts */
754 		emac_mac_reset(adpt);
755 	}
756 }
757 
758 static struct platform_driver emac_platform_driver = {
759 	.probe	= emac_probe,
760 	.remove	= emac_remove,
761 	.driver = {
762 		.name		= "qcom-emac",
763 		.of_match_table = emac_dt_match,
764 		.acpi_match_table = ACPI_PTR(emac_acpi_match),
765 	},
766 	.shutdown = emac_shutdown,
767 };
768 
769 module_platform_driver(emac_platform_driver);
770 
771 MODULE_LICENSE("GPL v2");
772 MODULE_ALIAS("platform:qcom-emac");
773