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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / ethernet / qualcomm / emac / emac.c
blob18b0c7a2d6dcb0b205f30af89a8186a867a7d233
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 int emac_start_xmit(struct sk_buff *skb, 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 *
295 * Reads the stats registers and write the values to adpt->stats.
296 *
297 * adpt->stats.lock must be held while calling this function,
298 * and while reading from adpt->stats.
299 */
300 void emac_update_hw_stats(struct emac_adapter *adpt)
301 {
302 struct emac_stats *stats = &adpt->stats;
303 u64 *stats_itr = &adpt->stats.rx_ok;
304 void __iomem *base = adpt->base;
305 unsigned int addr;
306
307 addr = REG_MAC_RX_STATUS_BIN;
308 while (addr <= REG_MAC_RX_STATUS_END) {
309 *stats_itr += readl_relaxed(base + addr);
310 stats_itr++;
311 addr += sizeof(u32);
312 }
313
314 /* additional rx status */
315 stats->rx_crc_align += readl_relaxed(base + EMAC_RXMAC_STATC_REG23);
316 stats->rx_jabbers += readl_relaxed(base + EMAC_RXMAC_STATC_REG24);
317
318 /* update tx status */
319 addr = REG_MAC_TX_STATUS_BIN;
320 stats_itr = &stats->tx_ok;
321
322 while (addr <= REG_MAC_TX_STATUS_END) {
323 *stats_itr += readl_relaxed(base + addr);
324 stats_itr++;
325 addr += sizeof(u32);
326 }
327
328 /* additional tx status */
329 stats->tx_col += readl_relaxed(base + EMAC_TXMAC_STATC_REG25);
330 }
331
332 /* Provide network statistics info for the interface */
333 static void emac_get_stats64(struct net_device *netdev,
334 struct rtnl_link_stats64 *net_stats)
335 {
336 struct emac_adapter *adpt = netdev_priv(netdev);
337 struct emac_stats *stats = &adpt->stats;
338
339 spin_lock(&stats->lock);
340
341 emac_update_hw_stats(adpt);
342
343 /* return parsed statistics */
344 net_stats->rx_packets = stats->rx_ok;
345 net_stats->tx_packets = stats->tx_ok;
346 net_stats->rx_bytes = stats->rx_byte_cnt;
347 net_stats->tx_bytes = stats->tx_byte_cnt;
348 net_stats->multicast = stats->rx_mcast;
349 net_stats->collisions = stats->tx_1_col + stats->tx_2_col * 2 +
350 stats->tx_late_col + stats->tx_abort_col;
351
352 net_stats->rx_errors = stats->rx_frag + stats->rx_fcs_err +
353 stats->rx_len_err + stats->rx_sz_ov +
354 stats->rx_align_err;
355 net_stats->rx_fifo_errors = stats->rx_rxf_ov;
356 net_stats->rx_length_errors = stats->rx_len_err;
357 net_stats->rx_crc_errors = stats->rx_fcs_err;
358 net_stats->rx_frame_errors = stats->rx_align_err;
359 net_stats->rx_over_errors = stats->rx_rxf_ov;
360 net_stats->rx_missed_errors = stats->rx_rxf_ov;
361
362 net_stats->tx_errors = stats->tx_late_col + stats->tx_abort_col +
363 stats->tx_underrun + stats->tx_trunc;
364 net_stats->tx_fifo_errors = stats->tx_underrun;
365 net_stats->tx_aborted_errors = stats->tx_abort_col;
366 net_stats->tx_window_errors = stats->tx_late_col;
367
368 spin_unlock(&stats->lock);
369 }
370
371 static const struct net_device_ops emac_netdev_ops = {
372 .ndo_open = emac_open,
373 .ndo_stop = emac_close,
374 .ndo_validate_addr = eth_validate_addr,
375 .ndo_start_xmit = emac_start_xmit,
376 .ndo_set_mac_address = eth_mac_addr,
377 .ndo_change_mtu = emac_change_mtu,
378 .ndo_do_ioctl = phy_do_ioctl_running,
379 .ndo_tx_timeout = emac_tx_timeout,
380 .ndo_get_stats64 = emac_get_stats64,
381 .ndo_set_features = emac_set_features,
382 .ndo_set_rx_mode = emac_rx_mode_set,
383 };
384
385 /* Watchdog task routine, called to reinitialize the EMAC */
386 static void emac_work_thread(struct work_struct *work)
387 {
388 struct emac_adapter *adpt =
389 container_of(work, struct emac_adapter, work_thread);
390
391 emac_reinit_locked(adpt);
392 }
393
394 /* Initialize various data structures */
395 static void emac_init_adapter(struct emac_adapter *adpt)
396 {
397 u32 reg;
398
399 adpt->rrd_size = EMAC_RRD_SIZE;
400 adpt->tpd_size = EMAC_TPD_SIZE;
401 adpt->rfd_size = EMAC_RFD_SIZE;
402
403 /* descriptors */
404 adpt->tx_desc_cnt = EMAC_DEF_TX_DESCS;
405 adpt->rx_desc_cnt = EMAC_DEF_RX_DESCS;
406
407 /* dma */
408 adpt->dma_order = emac_dma_ord_out;
409 adpt->dmar_block = emac_dma_req_4096;
410 adpt->dmaw_block = emac_dma_req_128;
411 adpt->dmar_dly_cnt = DMAR_DLY_CNT_DEF;
412 adpt->dmaw_dly_cnt = DMAW_DLY_CNT_DEF;
413 adpt->tpd_burst = TXQ0_NUM_TPD_PREF_DEF;
414 adpt->rfd_burst = RXQ0_NUM_RFD_PREF_DEF;
415
416 /* irq moderator */
417 reg = ((EMAC_DEF_RX_IRQ_MOD >> 1) << IRQ_MODERATOR2_INIT_SHFT) |
418 ((EMAC_DEF_TX_IRQ_MOD >> 1) << IRQ_MODERATOR_INIT_SHFT);
419 adpt->irq_mod = reg;
420
421 /* others */
422 adpt->preamble = EMAC_PREAMBLE_DEF;
423
424 /* default to automatic flow control */
425 adpt->automatic = true;
426
427 /* Disable single-pause-frame mode by default */
428 adpt->single_pause_mode = false;
429 }
430
431 /* Get the clock */
432 static int emac_clks_get(struct platform_device *pdev,
433 struct emac_adapter *adpt)
434 {
435 unsigned int i;
436
437 for (i = 0; i < EMAC_CLK_CNT; i++) {
438 struct clk *clk = devm_clk_get(&pdev->dev, emac_clk_name[i]);
439
440 if (IS_ERR(clk)) {
441 dev_err(&pdev->dev,
442 "could not claim clock %s (error=%li)\n",
443 emac_clk_name[i], PTR_ERR(clk));
444
445 return PTR_ERR(clk);
446 }
447
448 adpt->clk[i] = clk;
449 }
450
451 return 0;
452 }
453
454 /* Initialize clocks */
455 static int emac_clks_phase1_init(struct platform_device *pdev,
456 struct emac_adapter *adpt)
457 {
458 int ret;
459
460 /* On ACPI platforms, clocks are controlled by firmware and/or
461 * ACPI, not by drivers.
462 */
463 if (has_acpi_companion(&pdev->dev))
464 return 0;
465
466 ret = emac_clks_get(pdev, adpt);
467 if (ret)
468 return ret;
469
470 ret = clk_prepare_enable(adpt->clk[EMAC_CLK_AXI]);
471 if (ret)
472 return ret;
473
474 ret = clk_prepare_enable(adpt->clk[EMAC_CLK_CFG_AHB]);
475 if (ret)
476 return ret;
477
478 ret = clk_set_rate(adpt->clk[EMAC_CLK_HIGH_SPEED], 19200000);
479 if (ret)
480 return ret;
481
482 return clk_prepare_enable(adpt->clk[EMAC_CLK_HIGH_SPEED]);
483 }
484
485 /* Enable clocks; needs emac_clks_phase1_init to be called before */
486 static int emac_clks_phase2_init(struct platform_device *pdev,
487 struct emac_adapter *adpt)
488 {
489 int ret;
490
491 if (has_acpi_companion(&pdev->dev))
492 return 0;
493
494 ret = clk_set_rate(adpt->clk[EMAC_CLK_TX], 125000000);
495 if (ret)
496 return ret;
497
498 ret = clk_prepare_enable(adpt->clk[EMAC_CLK_TX]);
499 if (ret)
500 return ret;
501
502 ret = clk_set_rate(adpt->clk[EMAC_CLK_HIGH_SPEED], 125000000);
503 if (ret)
504 return ret;
505
506 ret = clk_set_rate(adpt->clk[EMAC_CLK_MDIO], 25000000);
507 if (ret)
508 return ret;
509
510 ret = clk_prepare_enable(adpt->clk[EMAC_CLK_MDIO]);
511 if (ret)
512 return ret;
513
514 ret = clk_prepare_enable(adpt->clk[EMAC_CLK_RX]);
515 if (ret)
516 return ret;
517
518 return clk_prepare_enable(adpt->clk[EMAC_CLK_SYS]);
519 }
520
521 static void emac_clks_teardown(struct emac_adapter *adpt)
522 {
523
524 unsigned int i;
525
526 for (i = 0; i < EMAC_CLK_CNT; i++)
527 clk_disable_unprepare(adpt->clk[i]);
528 }
529
530 /* Get the resources */
531 static int emac_probe_resources(struct platform_device *pdev,
532 struct emac_adapter *adpt)
533 {
534 struct net_device *netdev = adpt->netdev;
535 char maddr[ETH_ALEN];
536 int ret = 0;
537
538 /* get mac address */
539 if (device_get_mac_address(&pdev->dev, maddr, ETH_ALEN))
540 ether_addr_copy(netdev->dev_addr, maddr);
541 else
542 eth_hw_addr_random(netdev);
543
544 /* Core 0 interrupt */
545 ret = platform_get_irq(pdev, 0);
546 if (ret < 0)
547 return ret;
548 adpt->irq.irq = ret;
549
550 /* base register address */
551 adpt->base = devm_platform_ioremap_resource(pdev, 0);
552 if (IS_ERR(adpt->base))
553 return PTR_ERR(adpt->base);
554
555 /* CSR register address */
556 adpt->csr = devm_platform_ioremap_resource(pdev, 1);
557 if (IS_ERR(adpt->csr))
558 return PTR_ERR(adpt->csr);
559
560 netdev->base_addr = (unsigned long)adpt->base;
561
562 return 0;
563 }
564
565 static const struct of_device_id emac_dt_match[] = {
566 {
567 .compatible = "qcom,fsm9900-emac",
568 },
569 {}
570 };
571 MODULE_DEVICE_TABLE(of, emac_dt_match);
572
573 #if IS_ENABLED(CONFIG_ACPI)
574 static const struct acpi_device_id emac_acpi_match[] = {
575 {
576 .id = "QCOM8070",
577 },
578 {}
579 };
580 MODULE_DEVICE_TABLE(acpi, emac_acpi_match);
581 #endif
582
583 static int emac_probe(struct platform_device *pdev)
584 {
585 struct net_device *netdev;
586 struct emac_adapter *adpt;
587 struct emac_sgmii *phy;
588 u16 devid, revid;
589 u32 reg;
590 int ret;
591
592 /* The TPD buffer address is limited to:
593 * 1. PTP: 45bits. (Driver doesn't support yet.)
594 * 2. NON-PTP: 46bits.
595 */
596 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(46));
597 if (ret) {
598 dev_err(&pdev->dev, "could not set DMA mask\n");
599 return ret;
600 }
601
602 netdev = alloc_etherdev(sizeof(struct emac_adapter));
603 if (!netdev)
604 return -ENOMEM;
605
606 dev_set_drvdata(&pdev->dev, netdev);
607 SET_NETDEV_DEV(netdev, &pdev->dev);
608 emac_set_ethtool_ops(netdev);
609
610 adpt = netdev_priv(netdev);
611 adpt->netdev = netdev;
612 adpt->msg_enable = EMAC_MSG_DEFAULT;
613
614 phy = &adpt->phy;
615 atomic_set(&phy->decode_error_count, 0);
616
617 mutex_init(&adpt->reset_lock);
618 spin_lock_init(&adpt->stats.lock);
619
620 adpt->irq.mask = RX_PKT_INT0 | IMR_NORMAL_MASK;
621
622 ret = emac_probe_resources(pdev, adpt);
623 if (ret)
624 goto err_undo_netdev;
625
626 /* initialize clocks */
627 ret = emac_clks_phase1_init(pdev, adpt);
628 if (ret) {
629 dev_err(&pdev->dev, "could not initialize clocks\n");
630 goto err_undo_netdev;
631 }
632
633 netdev->watchdog_timeo = EMAC_WATCHDOG_TIME;
634 netdev->irq = adpt->irq.irq;
635
636 netdev->netdev_ops = &emac_netdev_ops;
637
638 emac_init_adapter(adpt);
639
640 /* init external phy */
641 ret = emac_phy_config(pdev, adpt);
642 if (ret)
643 goto err_undo_clocks;
644
645 /* init internal sgmii phy */
646 ret = emac_sgmii_config(pdev, adpt);
647 if (ret)
648 goto err_undo_mdiobus;
649
650 /* enable clocks */
651 ret = emac_clks_phase2_init(pdev, adpt);
652 if (ret) {
653 dev_err(&pdev->dev, "could not initialize clocks\n");
654 goto err_undo_mdiobus;
655 }
656
657 /* set hw features */
658 netdev->features = NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM |
659 NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_HW_VLAN_CTAG_RX |
660 NETIF_F_HW_VLAN_CTAG_TX;
661 netdev->hw_features = netdev->features;
662
663 netdev->vlan_features |= NETIF_F_SG | NETIF_F_HW_CSUM |
664 NETIF_F_TSO | NETIF_F_TSO6;
665
666 /* MTU range: 46 - 9194 */
667 netdev->min_mtu = EMAC_MIN_ETH_FRAME_SIZE -
668 (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
669 netdev->max_mtu = EMAC_MAX_ETH_FRAME_SIZE -
670 (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
671
672 INIT_WORK(&adpt->work_thread, emac_work_thread);
673
674 /* Initialize queues */
675 emac_mac_rx_tx_ring_init_all(pdev, adpt);
676
677 netif_napi_add(netdev, &adpt->rx_q.napi, emac_napi_rtx,
678 NAPI_POLL_WEIGHT);
679
680 ret = register_netdev(netdev);
681 if (ret) {
682 dev_err(&pdev->dev, "could not register net device\n");
683 goto err_undo_napi;
684 }
685
686 reg = readl_relaxed(adpt->base + EMAC_DMA_MAS_CTRL);
687 devid = (reg & DEV_ID_NUM_BMSK) >> DEV_ID_NUM_SHFT;
688 revid = (reg & DEV_REV_NUM_BMSK) >> DEV_REV_NUM_SHFT;
689 reg = readl_relaxed(adpt->base + EMAC_CORE_HW_VERSION);
690
691 netif_info(adpt, probe, netdev,
692 "hardware id %d.%d, hardware version %d.%d.%d\n",
693 devid, revid,
694 (reg & MAJOR_BMSK) >> MAJOR_SHFT,
695 (reg & MINOR_BMSK) >> MINOR_SHFT,
696 (reg & STEP_BMSK) >> STEP_SHFT);
697
698 return 0;
699
700 err_undo_napi:
701 netif_napi_del(&adpt->rx_q.napi);
702 err_undo_mdiobus:
703 put_device(&adpt->phydev->mdio.dev);
704 mdiobus_unregister(adpt->mii_bus);
705 err_undo_clocks:
706 emac_clks_teardown(adpt);
707 err_undo_netdev:
708 free_netdev(netdev);
709
710 return ret;
711 }
712
713 static int emac_remove(struct platform_device *pdev)
714 {
715 struct net_device *netdev = dev_get_drvdata(&pdev->dev);
716 struct emac_adapter *adpt = netdev_priv(netdev);
717
718 unregister_netdev(netdev);
719 netif_napi_del(&adpt->rx_q.napi);
720
721 emac_clks_teardown(adpt);
722
723 put_device(&adpt->phydev->mdio.dev);
724 mdiobus_unregister(adpt->mii_bus);
725 free_netdev(netdev);
726
727 if (adpt->phy.digital)
728 iounmap(adpt->phy.digital);
729 iounmap(adpt->phy.base);
730
731 return 0;
732 }
733
734 static void emac_shutdown(struct platform_device *pdev)
735 {
736 struct net_device *netdev = dev_get_drvdata(&pdev->dev);
737 struct emac_adapter *adpt = netdev_priv(netdev);
738
739 if (netdev->flags & IFF_UP) {
740 /* Closing the SGMII turns off its interrupts */
741 emac_sgmii_close(adpt);
742
743 /* Resetting the MAC turns off all DMA and its interrupts */
744 emac_mac_reset(adpt);
745 }
746 }
747
748 static struct platform_driver emac_platform_driver = {
749 .probe = emac_probe,
750 .remove = emac_remove,
751 .driver = {
752 .name = "qcom-emac",
753 .of_match_table = emac_dt_match,
754 .acpi_match_table = ACPI_PTR(emac_acpi_match),
755 },
756 .shutdown = emac_shutdown,
757 };
758
759 module_platform_driver(emac_platform_driver);
760
761 MODULE_LICENSE("GPL v2");
762 MODULE_ALIAS("platform:qcom-emac");
Linux with added FPC-III support