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/phy.h>
15 #include <linux/platform_device.h>
16 #include <linux/acpi.h>
17 #include "emac.h"
18 #include "emac-mac.h"
19 #include "emac-phy.h"
20 #include "emac-sgmii.h"
21 
22 #define EMAC_MSG_DEFAULT (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK |  \
23 		NETIF_MSG_TIMER | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP)
24 
25 #define EMAC_RRD_SIZE					     4
26 /* The RRD size if timestamping is enabled: */
27 #define EMAC_TS_RRD_SIZE				     6
28 #define EMAC_TPD_SIZE					     4
29 #define EMAC_RFD_SIZE					     2
30 
31 #define REG_MAC_RX_STATUS_BIN		 EMAC_RXMAC_STATC_REG0
32 #define REG_MAC_RX_STATUS_END		EMAC_RXMAC_STATC_REG22
33 #define REG_MAC_TX_STATUS_BIN		 EMAC_TXMAC_STATC_REG0
34 #define REG_MAC_TX_STATUS_END		EMAC_TXMAC_STATC_REG24
35 
36 #define RXQ0_NUM_RFD_PREF_DEF				     8
37 #define TXQ0_NUM_TPD_PREF_DEF				     5
38 
39 #define EMAC_PREAMBLE_DEF				     7
40 
41 #define DMAR_DLY_CNT_DEF				    15
42 #define DMAW_DLY_CNT_DEF				     4
43 
44 #define IMR_NORMAL_MASK		(ISR_ERROR | ISR_OVER | ISR_TX_PKT)
45 
46 #define ISR_TX_PKT      (\
47 	TX_PKT_INT      |\
48 	TX_PKT_INT1     |\
49 	TX_PKT_INT2     |\
50 	TX_PKT_INT3)
51 
52 #define ISR_OVER        (\
53 	RFD0_UR_INT     |\
54 	RFD1_UR_INT     |\
55 	RFD2_UR_INT     |\
56 	RFD3_UR_INT     |\
57 	RFD4_UR_INT     |\
58 	RXF_OF_INT      |\
59 	TXF_UR_INT)
60 
61 #define ISR_ERROR       (\
62 	DMAR_TO_INT     |\
63 	DMAW_TO_INT     |\
64 	TXQ_TO_INT)
65 
66 /* in sync with enum emac_clk_id */
67 static const char * const emac_clk_name[] = {
68 	"axi_clk", "cfg_ahb_clk", "high_speed_clk", "mdio_clk", "tx_clk",
69 	"rx_clk", "sys_clk"
70 };
71 
72 void emac_reg_update32(void __iomem *addr, u32 mask, u32 val)
73 {
74 	u32 data = readl(addr);
75 
76 	writel(((data & ~mask) | val), addr);
77 }
78 
79 /* reinitialize */
80 int emac_reinit_locked(struct emac_adapter *adpt)
81 {
82 	int ret;
83 
84 	mutex_lock(&adpt->reset_lock);
85 
86 	emac_mac_down(adpt);
87 	emac_sgmii_reset(adpt);
88 	ret = emac_mac_up(adpt);
89 
90 	mutex_unlock(&adpt->reset_lock);
91 
92 	return ret;
93 }
94 
95 /* NAPI */
96 static int emac_napi_rtx(struct napi_struct *napi, int budget)
97 {
98 	struct emac_rx_queue *rx_q =
99 		container_of(napi, struct emac_rx_queue, napi);
100 	struct emac_adapter *adpt = netdev_priv(rx_q->netdev);
101 	struct emac_irq *irq = rx_q->irq;
102 	int work_done = 0;
103 
104 	emac_mac_rx_process(adpt, rx_q, &work_done, budget);
105 
106 	if (work_done < budget) {
107 		napi_complete_done(napi, work_done);
108 
109 		irq->mask |= rx_q->intr;
110 		writel(irq->mask, adpt->base + EMAC_INT_MASK);
111 	}
112 
113 	return work_done;
114 }
115 
116 /* Transmit the packet */
117 static netdev_tx_t emac_start_xmit(struct sk_buff *skb,
118 				   struct net_device *netdev)
119 {
120 	struct emac_adapter *adpt = netdev_priv(netdev);
121 
122 	return emac_mac_tx_buf_send(adpt, &adpt->tx_q, skb);
123 }
124 
125 static irqreturn_t emac_isr(int _irq, void *data)
126 {
127 	struct emac_irq *irq = data;
128 	struct emac_adapter *adpt =
129 		container_of(irq, struct emac_adapter, irq);
130 	struct emac_rx_queue *rx_q = &adpt->rx_q;
131 	u32 isr, status;
132 
133 	/* disable the interrupt */
134 	writel(0, adpt->base + EMAC_INT_MASK);
135 
136 	isr = readl_relaxed(adpt->base + EMAC_INT_STATUS);
137 
138 	status = isr & irq->mask;
139 	if (status == 0)
140 		goto exit;
141 
142 	if (status & ISR_ERROR) {
143 		net_err_ratelimited("%s: error interrupt 0x%lx\n",
144 				    adpt->netdev->name, status & ISR_ERROR);
145 		/* reset MAC */
146 		schedule_work(&adpt->work_thread);
147 	}
148 
149 	/* Schedule the napi for receive queue with interrupt
150 	 * status bit set
151 	 */
152 	if (status & rx_q->intr) {
153 		if (napi_schedule_prep(&rx_q->napi)) {
154 			irq->mask &= ~rx_q->intr;
155 			__napi_schedule(&rx_q->napi);
156 		}
157 	}
158 
159 	if (status & TX_PKT_INT)
160 		emac_mac_tx_process(adpt, &adpt->tx_q);
161 
162 	if (status & ISR_OVER)
163 		net_warn_ratelimited("%s: TX/RX overflow interrupt\n",
164 				     adpt->netdev->name);
165 
166 exit:
167 	/* enable the interrupt */
168 	writel(irq->mask, adpt->base + EMAC_INT_MASK);
169 
170 	return IRQ_HANDLED;
171 }
172 
173 /* Configure VLAN tag strip/insert feature */
174 static int emac_set_features(struct net_device *netdev,
175 			     netdev_features_t features)
176 {
177 	netdev_features_t changed = features ^ netdev->features;
178 	struct emac_adapter *adpt = netdev_priv(netdev);
179 
180 	/* We only need to reprogram the hardware if the VLAN tag features
181 	 * have changed, and if it's already running.
182 	 */
183 	if (!(changed & (NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX)))
184 		return 0;
185 
186 	if (!netif_running(netdev))
187 		return 0;
188 
189 	/* emac_mac_mode_config() uses netdev->features to configure the EMAC,
190 	 * so make sure it's set first.
191 	 */
192 	netdev->features = features;
193 
194 	return emac_reinit_locked(adpt);
195 }
196 
197 /* Configure Multicast and Promiscuous modes */
198 static void emac_rx_mode_set(struct net_device *netdev)
199 {
200 	struct emac_adapter *adpt = netdev_priv(netdev);
201 	struct netdev_hw_addr *ha;
202 
203 	emac_mac_mode_config(adpt);
204 
205 	/* update multicast address filtering */
206 	emac_mac_multicast_addr_clear(adpt);
207 	netdev_for_each_mc_addr(ha, netdev)
208 		emac_mac_multicast_addr_set(adpt, ha->addr);
209 }
210 
211 /* Change the Maximum Transfer Unit (MTU) */
212 static int emac_change_mtu(struct net_device *netdev, int new_mtu)
213 {
214 	struct emac_adapter *adpt = netdev_priv(netdev);
215 
216 	netif_dbg(adpt, hw, adpt->netdev,
217 		  "changing MTU from %d to %d\n", netdev->mtu,
218 		  new_mtu);
219 	netdev->mtu = new_mtu;
220 
221 	if (netif_running(netdev))
222 		return emac_reinit_locked(adpt);
223 
224 	return 0;
225 }
226 
227 /* Called when the network interface is made active */
228 static int emac_open(struct net_device *netdev)
229 {
230 	struct emac_adapter *adpt = netdev_priv(netdev);
231 	struct emac_irq	*irq = &adpt->irq;
232 	int ret;
233 
234 	ret = request_irq(irq->irq, emac_isr, 0, "emac-core0", irq);
235 	if (ret) {
236 		netdev_err(adpt->netdev, "could not request emac-core0 irq\n");
237 		return ret;
238 	}
239 
240 	/* allocate rx/tx dma buffer & descriptors */
241 	ret = emac_mac_rx_tx_rings_alloc_all(adpt);
242 	if (ret) {
243 		netdev_err(adpt->netdev, "error allocating rx/tx rings\n");
244 		free_irq(irq->irq, irq);
245 		return ret;
246 	}
247 
248 	ret = emac_sgmii_open(adpt);
249 	if (ret) {
250 		emac_mac_rx_tx_rings_free_all(adpt);
251 		free_irq(irq->irq, irq);
252 		return ret;
253 	}
254 
255 	ret = emac_mac_up(adpt);
256 	if (ret) {
257 		emac_mac_rx_tx_rings_free_all(adpt);
258 		free_irq(irq->irq, irq);
259 		emac_sgmii_close(adpt);
260 		return ret;
261 	}
262 
263 	return 0;
264 }
265 
266 /* Called when the network interface is disabled */
267 static int emac_close(struct net_device *netdev)
268 {
269 	struct emac_adapter *adpt = netdev_priv(netdev);
270 
271 	mutex_lock(&adpt->reset_lock);
272 
273 	emac_sgmii_close(adpt);
274 	emac_mac_down(adpt);
275 	emac_mac_rx_tx_rings_free_all(adpt);
276 
277 	free_irq(adpt->irq.irq, &adpt->irq);
278 
279 	mutex_unlock(&adpt->reset_lock);
280 
281 	return 0;
282 }
283 
284 /* Respond to a TX hang */
285 static void emac_tx_timeout(struct net_device *netdev, unsigned int txqueue)
286 {
287 	struct emac_adapter *adpt = netdev_priv(netdev);
288 
289 	schedule_work(&adpt->work_thread);
290 }
291 
292 /**
293  * emac_update_hw_stats - read the EMAC stat registers
294  * @adpt: pointer to adapter struct
295  *
296  * Reads the stats registers and write the values to adpt->stats.
297  *
298  * adpt->stats.lock must be held while calling this function,
299  * and while reading from adpt->stats.
300  */
301 void emac_update_hw_stats(struct emac_adapter *adpt)
302 {
303 	struct emac_stats *stats = &adpt->stats;
304 	u64 *stats_itr = &adpt->stats.rx_ok;
305 	void __iomem *base = adpt->base;
306 	unsigned int addr;
307 
308 	addr = REG_MAC_RX_STATUS_BIN;
309 	while (addr <= REG_MAC_RX_STATUS_END) {
310 		*stats_itr += readl_relaxed(base + addr);
311 		stats_itr++;
312 		addr += sizeof(u32);
313 	}
314 
315 	/* additional rx status */
316 	stats->rx_crc_align += readl_relaxed(base + EMAC_RXMAC_STATC_REG23);
317 	stats->rx_jabbers += readl_relaxed(base + EMAC_RXMAC_STATC_REG24);
318 
319 	/* update tx status */
320 	addr = REG_MAC_TX_STATUS_BIN;
321 	stats_itr = &stats->tx_ok;
322 
323 	while (addr <= REG_MAC_TX_STATUS_END) {
324 		*stats_itr += readl_relaxed(base + addr);
325 		stats_itr++;
326 		addr += sizeof(u32);
327 	}
328 
329 	/* additional tx status */
330 	stats->tx_col += readl_relaxed(base + EMAC_TXMAC_STATC_REG25);
331 }
332 
333 /* Provide network statistics info for the interface */
334 static void emac_get_stats64(struct net_device *netdev,
335 			     struct rtnl_link_stats64 *net_stats)
336 {
337 	struct emac_adapter *adpt = netdev_priv(netdev);
338 	struct emac_stats *stats = &adpt->stats;
339 
340 	spin_lock(&stats->lock);
341 
342 	emac_update_hw_stats(adpt);
343 
344 	/* return parsed statistics */
345 	net_stats->rx_packets = stats->rx_ok;
346 	net_stats->tx_packets = stats->tx_ok;
347 	net_stats->rx_bytes = stats->rx_byte_cnt;
348 	net_stats->tx_bytes = stats->tx_byte_cnt;
349 	net_stats->multicast = stats->rx_mcast;
350 	net_stats->collisions = stats->tx_1_col + stats->tx_2_col * 2 +
351 				stats->tx_late_col + stats->tx_abort_col;
352 
353 	net_stats->rx_errors = stats->rx_frag + stats->rx_fcs_err +
354 			       stats->rx_len_err + stats->rx_sz_ov +
355 			       stats->rx_align_err;
356 	net_stats->rx_fifo_errors = stats->rx_rxf_ov;
357 	net_stats->rx_length_errors = stats->rx_len_err;
358 	net_stats->rx_crc_errors = stats->rx_fcs_err;
359 	net_stats->rx_frame_errors = stats->rx_align_err;
360 	net_stats->rx_over_errors = stats->rx_rxf_ov;
361 	net_stats->rx_missed_errors = stats->rx_rxf_ov;
362 
363 	net_stats->tx_errors = stats->tx_late_col + stats->tx_abort_col +
364 			       stats->tx_underrun + stats->tx_trunc;
365 	net_stats->tx_fifo_errors = stats->tx_underrun;
366 	net_stats->tx_aborted_errors = stats->tx_abort_col;
367 	net_stats->tx_window_errors = stats->tx_late_col;
368 
369 	spin_unlock(&stats->lock);
370 }
371 
372 static const struct net_device_ops emac_netdev_ops = {
373 	.ndo_open		= emac_open,
374 	.ndo_stop		= emac_close,
375 	.ndo_validate_addr	= eth_validate_addr,
376 	.ndo_start_xmit		= emac_start_xmit,
377 	.ndo_set_mac_address	= eth_mac_addr,
378 	.ndo_change_mtu		= emac_change_mtu,
379 	.ndo_eth_ioctl		= phy_do_ioctl_running,
380 	.ndo_tx_timeout		= emac_tx_timeout,
381 	.ndo_get_stats64	= emac_get_stats64,
382 	.ndo_set_features       = emac_set_features,
383 	.ndo_set_rx_mode        = emac_rx_mode_set,
384 };
385 
386 /* Watchdog task routine, called to reinitialize the EMAC */
387 static void emac_work_thread(struct work_struct *work)
388 {
389 	struct emac_adapter *adpt =
390 		container_of(work, struct emac_adapter, work_thread);
391 
392 	emac_reinit_locked(adpt);
393 }
394 
395 /* Initialize various data structures  */
396 static void emac_init_adapter(struct emac_adapter *adpt)
397 {
398 	u32 reg;
399 
400 	adpt->rrd_size = EMAC_RRD_SIZE;
401 	adpt->tpd_size = EMAC_TPD_SIZE;
402 	adpt->rfd_size = EMAC_RFD_SIZE;
403 
404 	/* descriptors */
405 	adpt->tx_desc_cnt = EMAC_DEF_TX_DESCS;
406 	adpt->rx_desc_cnt = EMAC_DEF_RX_DESCS;
407 
408 	/* dma */
409 	adpt->dma_order = emac_dma_ord_out;
410 	adpt->dmar_block = emac_dma_req_4096;
411 	adpt->dmaw_block = emac_dma_req_128;
412 	adpt->dmar_dly_cnt = DMAR_DLY_CNT_DEF;
413 	adpt->dmaw_dly_cnt = DMAW_DLY_CNT_DEF;
414 	adpt->tpd_burst = TXQ0_NUM_TPD_PREF_DEF;
415 	adpt->rfd_burst = RXQ0_NUM_RFD_PREF_DEF;
416 
417 	/* irq moderator */
418 	reg = ((EMAC_DEF_RX_IRQ_MOD >> 1) << IRQ_MODERATOR2_INIT_SHFT) |
419 	      ((EMAC_DEF_TX_IRQ_MOD >> 1) << IRQ_MODERATOR_INIT_SHFT);
420 	adpt->irq_mod = reg;
421 
422 	/* others */
423 	adpt->preamble = EMAC_PREAMBLE_DEF;
424 
425 	/* default to automatic flow control */
426 	adpt->automatic = true;
427 
428 	/* Disable single-pause-frame mode by default */
429 	adpt->single_pause_mode = false;
430 }
431 
432 /* Get the clock */
433 static int emac_clks_get(struct platform_device *pdev,
434 			 struct emac_adapter *adpt)
435 {
436 	unsigned int i;
437 
438 	for (i = 0; i < EMAC_CLK_CNT; i++) {
439 		struct clk *clk = devm_clk_get(&pdev->dev, emac_clk_name[i]);
440 
441 		if (IS_ERR(clk)) {
442 			dev_err(&pdev->dev,
443 				"could not claim clock %s (error=%li)\n",
444 				emac_clk_name[i], PTR_ERR(clk));
445 
446 			return PTR_ERR(clk);
447 		}
448 
449 		adpt->clk[i] = clk;
450 	}
451 
452 	return 0;
453 }
454 
455 /* Initialize clocks */
456 static int emac_clks_phase1_init(struct platform_device *pdev,
457 				 struct emac_adapter *adpt)
458 {
459 	int ret;
460 
461 	/* On ACPI platforms, clocks are controlled by firmware and/or
462 	 * ACPI, not by drivers.
463 	 */
464 	if (has_acpi_companion(&pdev->dev))
465 		return 0;
466 
467 	ret = emac_clks_get(pdev, adpt);
468 	if (ret)
469 		return ret;
470 
471 	ret = clk_prepare_enable(adpt->clk[EMAC_CLK_AXI]);
472 	if (ret)
473 		return ret;
474 
475 	ret = clk_prepare_enable(adpt->clk[EMAC_CLK_CFG_AHB]);
476 	if (ret)
477 		goto disable_clk_axi;
478 
479 	ret = clk_set_rate(adpt->clk[EMAC_CLK_HIGH_SPEED], 19200000);
480 	if (ret)
481 		goto disable_clk_cfg_ahb;
482 
483 	ret = clk_prepare_enable(adpt->clk[EMAC_CLK_HIGH_SPEED]);
484 	if (ret)
485 		goto disable_clk_cfg_ahb;
486 
487 	return 0;
488 
489 disable_clk_cfg_ahb:
490 	clk_disable_unprepare(adpt->clk[EMAC_CLK_CFG_AHB]);
491 disable_clk_axi:
492 	clk_disable_unprepare(adpt->clk[EMAC_CLK_AXI]);
493 
494 	return ret;
495 }
496 
497 /* Enable clocks; needs emac_clks_phase1_init to be called before */
498 static int emac_clks_phase2_init(struct platform_device *pdev,
499 				 struct emac_adapter *adpt)
500 {
501 	int ret;
502 
503 	if (has_acpi_companion(&pdev->dev))
504 		return 0;
505 
506 	ret = clk_set_rate(adpt->clk[EMAC_CLK_TX], 125000000);
507 	if (ret)
508 		return ret;
509 
510 	ret = clk_prepare_enable(adpt->clk[EMAC_CLK_TX]);
511 	if (ret)
512 		return ret;
513 
514 	ret = clk_set_rate(adpt->clk[EMAC_CLK_HIGH_SPEED], 125000000);
515 	if (ret)
516 		return ret;
517 
518 	ret = clk_set_rate(adpt->clk[EMAC_CLK_MDIO], 25000000);
519 	if (ret)
520 		return ret;
521 
522 	ret = clk_prepare_enable(adpt->clk[EMAC_CLK_MDIO]);
523 	if (ret)
524 		return ret;
525 
526 	ret = clk_prepare_enable(adpt->clk[EMAC_CLK_RX]);
527 	if (ret)
528 		return ret;
529 
530 	return clk_prepare_enable(adpt->clk[EMAC_CLK_SYS]);
531 }
532 
533 static void emac_clks_teardown(struct emac_adapter *adpt)
534 {
535 
536 	unsigned int i;
537 
538 	for (i = 0; i < EMAC_CLK_CNT; i++)
539 		clk_disable_unprepare(adpt->clk[i]);
540 }
541 
542 /* Get the resources */
543 static int emac_probe_resources(struct platform_device *pdev,
544 				struct emac_adapter *adpt)
545 {
546 	struct net_device *netdev = adpt->netdev;
547 	int ret = 0;
548 
549 	/* get mac address */
550 	if (device_get_ethdev_address(&pdev->dev, netdev))
551 		eth_hw_addr_random(netdev);
552 
553 	/* Core 0 interrupt */
554 	ret = platform_get_irq(pdev, 0);
555 	if (ret < 0)
556 		return ret;
557 	adpt->irq.irq = ret;
558 
559 	/* base register address */
560 	adpt->base = devm_platform_ioremap_resource(pdev, 0);
561 	if (IS_ERR(adpt->base))
562 		return PTR_ERR(adpt->base);
563 
564 	/* CSR register address */
565 	adpt->csr = devm_platform_ioremap_resource(pdev, 1);
566 	if (IS_ERR(adpt->csr))
567 		return PTR_ERR(adpt->csr);
568 
569 	netdev->base_addr = (unsigned long)adpt->base;
570 
571 	return 0;
572 }
573 
574 static const struct of_device_id emac_dt_match[] = {
575 	{
576 		.compatible = "qcom,fsm9900-emac",
577 	},
578 	{}
579 };
580 MODULE_DEVICE_TABLE(of, emac_dt_match);
581 
582 #if IS_ENABLED(CONFIG_ACPI)
583 static const struct acpi_device_id emac_acpi_match[] = {
584 	{
585 		.id = "QCOM8070",
586 	},
587 	{}
588 };
589 MODULE_DEVICE_TABLE(acpi, emac_acpi_match);
590 #endif
591 
592 static int emac_probe(struct platform_device *pdev)
593 {
594 	struct net_device *netdev;
595 	struct emac_adapter *adpt;
596 	struct emac_sgmii *phy;
597 	u16 devid, revid;
598 	u32 reg;
599 	int ret;
600 
601 	/* The TPD buffer address is limited to:
602 	 * 1. PTP:	45bits. (Driver doesn't support yet.)
603 	 * 2. NON-PTP:	46bits.
604 	 */
605 	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(46));
606 	if (ret) {
607 		dev_err(&pdev->dev, "could not set DMA mask\n");
608 		return ret;
609 	}
610 
611 	netdev = alloc_etherdev(sizeof(struct emac_adapter));
612 	if (!netdev)
613 		return -ENOMEM;
614 
615 	dev_set_drvdata(&pdev->dev, netdev);
616 	SET_NETDEV_DEV(netdev, &pdev->dev);
617 	emac_set_ethtool_ops(netdev);
618 
619 	adpt = netdev_priv(netdev);
620 	adpt->netdev = netdev;
621 	adpt->msg_enable = EMAC_MSG_DEFAULT;
622 
623 	phy = &adpt->phy;
624 	atomic_set(&phy->decode_error_count, 0);
625 
626 	mutex_init(&adpt->reset_lock);
627 	spin_lock_init(&adpt->stats.lock);
628 
629 	adpt->irq.mask = RX_PKT_INT0 | IMR_NORMAL_MASK;
630 
631 	ret = emac_probe_resources(pdev, adpt);
632 	if (ret)
633 		goto err_undo_netdev;
634 
635 	/* initialize clocks */
636 	ret = emac_clks_phase1_init(pdev, adpt);
637 	if (ret) {
638 		dev_err(&pdev->dev, "could not initialize clocks\n");
639 		goto err_undo_netdev;
640 	}
641 
642 	netdev->watchdog_timeo = EMAC_WATCHDOG_TIME;
643 	netdev->irq = adpt->irq.irq;
644 
645 	netdev->netdev_ops = &emac_netdev_ops;
646 
647 	emac_init_adapter(adpt);
648 
649 	/* init external phy */
650 	ret = emac_phy_config(pdev, adpt);
651 	if (ret)
652 		goto err_undo_clocks;
653 
654 	/* init internal sgmii phy */
655 	ret = emac_sgmii_config(pdev, adpt);
656 	if (ret)
657 		goto err_undo_mdiobus;
658 
659 	/* enable clocks */
660 	ret = emac_clks_phase2_init(pdev, adpt);
661 	if (ret) {
662 		dev_err(&pdev->dev, "could not initialize clocks\n");
663 		goto err_undo_mdiobus;
664 	}
665 
666 	/* set hw features */
667 	netdev->features = NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM |
668 			NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_HW_VLAN_CTAG_RX |
669 			NETIF_F_HW_VLAN_CTAG_TX;
670 	netdev->hw_features = netdev->features;
671 
672 	netdev->vlan_features |= NETIF_F_SG | NETIF_F_HW_CSUM |
673 				 NETIF_F_TSO | NETIF_F_TSO6;
674 
675 	/* MTU range: 46 - 9194 */
676 	netdev->min_mtu = EMAC_MIN_ETH_FRAME_SIZE -
677 			  (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
678 	netdev->max_mtu = EMAC_MAX_ETH_FRAME_SIZE -
679 			  (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
680 
681 	INIT_WORK(&adpt->work_thread, emac_work_thread);
682 
683 	/* Initialize queues */
684 	emac_mac_rx_tx_ring_init_all(pdev, adpt);
685 
686 	netif_napi_add(netdev, &adpt->rx_q.napi, emac_napi_rtx);
687 
688 	ret = register_netdev(netdev);
689 	if (ret) {
690 		dev_err(&pdev->dev, "could not register net device\n");
691 		goto err_undo_napi;
692 	}
693 
694 	reg =  readl_relaxed(adpt->base + EMAC_DMA_MAS_CTRL);
695 	devid = (reg & DEV_ID_NUM_BMSK)  >> DEV_ID_NUM_SHFT;
696 	revid = (reg & DEV_REV_NUM_BMSK) >> DEV_REV_NUM_SHFT;
697 	reg = readl_relaxed(adpt->base + EMAC_CORE_HW_VERSION);
698 
699 	netif_info(adpt, probe, netdev,
700 		   "hardware id %d.%d, hardware version %d.%d.%d\n",
701 		   devid, revid,
702 		   (reg & MAJOR_BMSK) >> MAJOR_SHFT,
703 		   (reg & MINOR_BMSK) >> MINOR_SHFT,
704 		   (reg & STEP_BMSK)  >> STEP_SHFT);
705 
706 	return 0;
707 
708 err_undo_napi:
709 	netif_napi_del(&adpt->rx_q.napi);
710 err_undo_mdiobus:
711 	put_device(&adpt->phydev->mdio.dev);
712 	mdiobus_unregister(adpt->mii_bus);
713 err_undo_clocks:
714 	emac_clks_teardown(adpt);
715 err_undo_netdev:
716 	free_netdev(netdev);
717 
718 	return ret;
719 }
720 
721 static int emac_remove(struct platform_device *pdev)
722 {
723 	struct net_device *netdev = dev_get_drvdata(&pdev->dev);
724 	struct emac_adapter *adpt = netdev_priv(netdev);
725 
726 	netif_carrier_off(netdev);
727 	netif_tx_disable(netdev);
728 
729 	unregister_netdev(netdev);
730 	netif_napi_del(&adpt->rx_q.napi);
731 
732 	free_irq(adpt->irq.irq, &adpt->irq);
733 	cancel_work_sync(&adpt->work_thread);
734 
735 	emac_clks_teardown(adpt);
736 
737 	put_device(&adpt->phydev->mdio.dev);
738 	mdiobus_unregister(adpt->mii_bus);
739 
740 	if (adpt->phy.digital)
741 		iounmap(adpt->phy.digital);
742 	iounmap(adpt->phy.base);
743 
744 	free_netdev(netdev);
745 
746 	return 0;
747 }
748 
749 static void emac_shutdown(struct platform_device *pdev)
750 {
751 	struct net_device *netdev = dev_get_drvdata(&pdev->dev);
752 	struct emac_adapter *adpt = netdev_priv(netdev);
753 
754 	if (netdev->flags & IFF_UP) {
755 		/* Closing the SGMII turns off its interrupts */
756 		emac_sgmii_close(adpt);
757 
758 		/* Resetting the MAC turns off all DMA and its interrupts */
759 		emac_mac_reset(adpt);
760 	}
761 }
762 
763 static struct platform_driver emac_platform_driver = {
764 	.probe	= emac_probe,
765 	.remove	= emac_remove,
766 	.driver = {
767 		.name		= "qcom-emac",
768 		.of_match_table = emac_dt_match,
769 		.acpi_match_table = ACPI_PTR(emac_acpi_match),
770 	},
771 	.shutdown = emac_shutdown,
772 };
773 
774 module_platform_driver(emac_platform_driver);
775 
776 MODULE_LICENSE("GPL v2");
777 MODULE_ALIAS("platform:qcom-emac");
778