1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * AHCI SATA platform library
4  *
5  * Copyright 2004-2005  Red Hat, Inc.
6  *   Jeff Garzik <jgarzik@pobox.com>
7  * Copyright 2010  MontaVista Software, LLC.
8  *   Anton Vorontsov <avorontsov@ru.mvista.com>
9  */
10 
11 #include <linux/clk.h>
12 #include <linux/kernel.h>
13 #include <linux/gfp.h>
14 #include <linux/module.h>
15 #include <linux/pm.h>
16 #include <linux/interrupt.h>
17 #include <linux/device.h>
18 #include <linux/platform_device.h>
19 #include <linux/libata.h>
20 #include <linux/ahci_platform.h>
21 #include <linux/phy/phy.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/of_platform.h>
24 #include <linux/reset.h>
25 #include "ahci.h"
26 
27 static void ahci_host_stop(struct ata_host *host);
28 
29 struct ata_port_operations ahci_platform_ops = {
30 	.inherits	= &ahci_ops,
31 	.host_stop	= ahci_host_stop,
32 };
33 EXPORT_SYMBOL_GPL(ahci_platform_ops);
34 
35 /**
36  * ahci_platform_enable_phys - Enable PHYs
37  * @hpriv: host private area to store config values
38  *
39  * This function enables all the PHYs found in hpriv->phys, if any.
40  * If a PHY fails to be enabled, it disables all the PHYs already
41  * enabled in reverse order and returns an error.
42  *
43  * RETURNS:
44  * 0 on success otherwise a negative error code
45  */
46 int ahci_platform_enable_phys(struct ahci_host_priv *hpriv)
47 {
48 	int rc, i;
49 
50 	for (i = 0; i < hpriv->nports; i++) {
51 		rc = phy_init(hpriv->phys[i]);
52 		if (rc)
53 			goto disable_phys;
54 
55 		rc = phy_set_mode(hpriv->phys[i], PHY_MODE_SATA);
56 		if (rc) {
57 			phy_exit(hpriv->phys[i]);
58 			goto disable_phys;
59 		}
60 
61 		rc = phy_power_on(hpriv->phys[i]);
62 		if (rc) {
63 			phy_exit(hpriv->phys[i]);
64 			goto disable_phys;
65 		}
66 	}
67 
68 	return 0;
69 
70 disable_phys:
71 	while (--i >= 0) {
72 		phy_power_off(hpriv->phys[i]);
73 		phy_exit(hpriv->phys[i]);
74 	}
75 	return rc;
76 }
77 EXPORT_SYMBOL_GPL(ahci_platform_enable_phys);
78 
79 /**
80  * ahci_platform_disable_phys - Disable PHYs
81  * @hpriv: host private area to store config values
82  *
83  * This function disables all PHYs found in hpriv->phys.
84  */
85 void ahci_platform_disable_phys(struct ahci_host_priv *hpriv)
86 {
87 	int i;
88 
89 	for (i = 0; i < hpriv->nports; i++) {
90 		phy_power_off(hpriv->phys[i]);
91 		phy_exit(hpriv->phys[i]);
92 	}
93 }
94 EXPORT_SYMBOL_GPL(ahci_platform_disable_phys);
95 
96 /**
97  * ahci_platform_find_clk - Find platform clock
98  * @hpriv: host private area to store config values
99  * @con_id: clock connection ID
100  *
101  * This function returns a pointer to the clock descriptor of the clock with
102  * the passed ID.
103  *
104  * RETURNS:
105  * Pointer to the clock descriptor on success otherwise NULL
106  */
107 struct clk *ahci_platform_find_clk(struct ahci_host_priv *hpriv, const char *con_id)
108 {
109 	int i;
110 
111 	for (i = 0; i < hpriv->n_clks; i++) {
112 		if (hpriv->clks[i].id && !strcmp(hpriv->clks[i].id, con_id))
113 			return hpriv->clks[i].clk;
114 	}
115 
116 	return NULL;
117 }
118 EXPORT_SYMBOL_GPL(ahci_platform_find_clk);
119 
120 /**
121  * ahci_platform_enable_clks - Enable platform clocks
122  * @hpriv: host private area to store config values
123  *
124  * This function enables all the clks found for the AHCI device.
125  *
126  * RETURNS:
127  * 0 on success otherwise a negative error code
128  */
129 int ahci_platform_enable_clks(struct ahci_host_priv *hpriv)
130 {
131 	return clk_bulk_prepare_enable(hpriv->n_clks, hpriv->clks);
132 }
133 EXPORT_SYMBOL_GPL(ahci_platform_enable_clks);
134 
135 /**
136  * ahci_platform_disable_clks - Disable platform clocks
137  * @hpriv: host private area to store config values
138  *
139  * This function disables all the clocks enabled before
140  * (bulk-clocks-disable function is supposed to do that in reverse
141  * from the enabling procedure order).
142  */
143 void ahci_platform_disable_clks(struct ahci_host_priv *hpriv)
144 {
145 	clk_bulk_disable_unprepare(hpriv->n_clks, hpriv->clks);
146 }
147 EXPORT_SYMBOL_GPL(ahci_platform_disable_clks);
148 
149 /**
150  * ahci_platform_deassert_rsts - Deassert/trigger platform resets
151  * @hpriv: host private area to store config values
152  *
153  * This function deasserts or triggers all the reset lines found for
154  * the AHCI device.
155  *
156  * RETURNS:
157  * 0 on success otherwise a negative error code
158  */
159 int ahci_platform_deassert_rsts(struct ahci_host_priv *hpriv)
160 {
161 	if (hpriv->f_rsts & AHCI_PLATFORM_RST_TRIGGER)
162 		return reset_control_reset(hpriv->rsts);
163 
164 	return reset_control_deassert(hpriv->rsts);
165 }
166 EXPORT_SYMBOL_GPL(ahci_platform_deassert_rsts);
167 
168 /**
169  * ahci_platform_assert_rsts - Assert/rearm platform resets
170  * @hpriv: host private area to store config values
171  *
172  * This function asserts or rearms (for self-deasserting resets) all
173  * the reset controls found for the AHCI device.
174  *
175  * RETURNS:
176  * 0 on success otherwise a negative error code
177  */
178 int ahci_platform_assert_rsts(struct ahci_host_priv *hpriv)
179 {
180 	if (hpriv->f_rsts & AHCI_PLATFORM_RST_TRIGGER)
181 		return reset_control_rearm(hpriv->rsts);
182 
183 	return reset_control_assert(hpriv->rsts);
184 }
185 EXPORT_SYMBOL_GPL(ahci_platform_assert_rsts);
186 
187 /**
188  * ahci_platform_enable_regulators - Enable regulators
189  * @hpriv: host private area to store config values
190  *
191  * This function enables all the regulators found in controller and
192  * hpriv->target_pwrs, if any.  If a regulator fails to be enabled, it
193  * disables all the regulators already enabled in reverse order and
194  * returns an error.
195  *
196  * RETURNS:
197  * 0 on success otherwise a negative error code
198  */
199 int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv)
200 {
201 	int rc, i;
202 
203 	rc = regulator_enable(hpriv->ahci_regulator);
204 	if (rc)
205 		return rc;
206 
207 	rc = regulator_enable(hpriv->phy_regulator);
208 	if (rc)
209 		goto disable_ahci_pwrs;
210 
211 	for (i = 0; i < hpriv->nports; i++) {
212 		if (!hpriv->target_pwrs[i])
213 			continue;
214 
215 		rc = regulator_enable(hpriv->target_pwrs[i]);
216 		if (rc)
217 			goto disable_target_pwrs;
218 	}
219 
220 	return 0;
221 
222 disable_target_pwrs:
223 	while (--i >= 0)
224 		if (hpriv->target_pwrs[i])
225 			regulator_disable(hpriv->target_pwrs[i]);
226 
227 	regulator_disable(hpriv->phy_regulator);
228 disable_ahci_pwrs:
229 	regulator_disable(hpriv->ahci_regulator);
230 	return rc;
231 }
232 EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators);
233 
234 /**
235  * ahci_platform_disable_regulators - Disable regulators
236  * @hpriv: host private area to store config values
237  *
238  * This function disables all regulators found in hpriv->target_pwrs and
239  * AHCI controller.
240  */
241 void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv)
242 {
243 	int i;
244 
245 	for (i = 0; i < hpriv->nports; i++) {
246 		if (!hpriv->target_pwrs[i])
247 			continue;
248 		regulator_disable(hpriv->target_pwrs[i]);
249 	}
250 
251 	regulator_disable(hpriv->ahci_regulator);
252 	regulator_disable(hpriv->phy_regulator);
253 }
254 EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators);
255 /**
256  * ahci_platform_enable_resources - Enable platform resources
257  * @hpriv: host private area to store config values
258  *
259  * This function enables all ahci_platform managed resources in the
260  * following order:
261  * 1) Regulator
262  * 2) Clocks (through ahci_platform_enable_clks)
263  * 3) Resets
264  * 4) Phys
265  *
266  * If resource enabling fails at any point the previous enabled resources
267  * are disabled in reverse order.
268  *
269  * RETURNS:
270  * 0 on success otherwise a negative error code
271  */
272 int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
273 {
274 	int rc;
275 
276 	rc = ahci_platform_enable_regulators(hpriv);
277 	if (rc)
278 		return rc;
279 
280 	rc = ahci_platform_enable_clks(hpriv);
281 	if (rc)
282 		goto disable_regulator;
283 
284 	rc = ahci_platform_deassert_rsts(hpriv);
285 	if (rc)
286 		goto disable_clks;
287 
288 	rc = ahci_platform_enable_phys(hpriv);
289 	if (rc)
290 		goto disable_rsts;
291 
292 	return 0;
293 
294 disable_rsts:
295 	ahci_platform_assert_rsts(hpriv);
296 
297 disable_clks:
298 	ahci_platform_disable_clks(hpriv);
299 
300 disable_regulator:
301 	ahci_platform_disable_regulators(hpriv);
302 
303 	return rc;
304 }
305 EXPORT_SYMBOL_GPL(ahci_platform_enable_resources);
306 
307 /**
308  * ahci_platform_disable_resources - Disable platform resources
309  * @hpriv: host private area to store config values
310  *
311  * This function disables all ahci_platform managed resources in the
312  * following order:
313  * 1) Phys
314  * 2) Resets
315  * 3) Clocks (through ahci_platform_disable_clks)
316  * 4) Regulator
317  */
318 void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)
319 {
320 	ahci_platform_disable_phys(hpriv);
321 
322 	ahci_platform_assert_rsts(hpriv);
323 
324 	ahci_platform_disable_clks(hpriv);
325 
326 	ahci_platform_disable_regulators(hpriv);
327 }
328 EXPORT_SYMBOL_GPL(ahci_platform_disable_resources);
329 
330 static void ahci_platform_put_resources(struct device *dev, void *res)
331 {
332 	struct ahci_host_priv *hpriv = res;
333 	int c;
334 
335 	if (hpriv->got_runtime_pm) {
336 		pm_runtime_put_sync(dev);
337 		pm_runtime_disable(dev);
338 	}
339 
340 	/*
341 	 * The regulators are tied to child node device and not to the
342 	 * SATA device itself. So we can't use devm for automatically
343 	 * releasing them. We have to do it manually here.
344 	 */
345 	for (c = 0; c < hpriv->nports; c++)
346 		if (hpriv->target_pwrs && hpriv->target_pwrs[c])
347 			regulator_put(hpriv->target_pwrs[c]);
348 
349 	kfree(hpriv->target_pwrs);
350 }
351 
352 static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port,
353 				struct device *dev, struct device_node *node)
354 {
355 	int rc;
356 
357 	hpriv->phys[port] = devm_of_phy_get(dev, node, NULL);
358 
359 	if (!IS_ERR(hpriv->phys[port]))
360 		return 0;
361 
362 	rc = PTR_ERR(hpriv->phys[port]);
363 	switch (rc) {
364 	case -ENOSYS:
365 		/* No PHY support. Check if PHY is required. */
366 		if (of_property_present(node, "phys")) {
367 			dev_err(dev,
368 				"couldn't get PHY in node %pOFn: ENOSYS\n",
369 				node);
370 			break;
371 		}
372 		fallthrough;
373 	case -ENODEV:
374 		/* continue normally */
375 		hpriv->phys[port] = NULL;
376 		rc = 0;
377 		break;
378 	case -EPROBE_DEFER:
379 		/* Do not complain yet */
380 		break;
381 
382 	default:
383 		dev_err(dev,
384 			"couldn't get PHY in node %pOFn: %d\n",
385 			node, rc);
386 
387 		break;
388 	}
389 
390 	return rc;
391 }
392 
393 static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port,
394 				struct device *dev)
395 {
396 	struct regulator *target_pwr;
397 	int rc = 0;
398 
399 	target_pwr = regulator_get(dev, "target");
400 
401 	if (!IS_ERR(target_pwr))
402 		hpriv->target_pwrs[port] = target_pwr;
403 	else
404 		rc = PTR_ERR(target_pwr);
405 
406 	return rc;
407 }
408 
409 static int ahci_platform_get_firmware(struct ahci_host_priv *hpriv,
410 				      struct device *dev)
411 {
412 	struct device_node *child;
413 	u32 port;
414 
415 	if (!of_property_read_u32(dev->of_node, "hba-cap", &hpriv->saved_cap))
416 		hpriv->saved_cap &= (HOST_CAP_SSS | HOST_CAP_MPS);
417 
418 	of_property_read_u32(dev->of_node,
419 			     "ports-implemented", &hpriv->saved_port_map);
420 
421 	for_each_child_of_node(dev->of_node, child) {
422 		if (!of_device_is_available(child))
423 			continue;
424 
425 		if (of_property_read_u32(child, "reg", &port)) {
426 			of_node_put(child);
427 			return -EINVAL;
428 		}
429 
430 		if (!of_property_read_u32(child, "hba-port-cap", &hpriv->saved_port_cap[port]))
431 			hpriv->saved_port_cap[port] &= PORT_CMD_CAP;
432 	}
433 
434 	return 0;
435 }
436 
437 /**
438  * ahci_platform_get_resources - Get platform resources
439  * @pdev: platform device to get resources for
440  * @flags: bitmap representing the resource to get
441  *
442  * This function allocates an ahci_host_priv struct, and gets the following
443  * resources, storing a reference to them inside the returned struct:
444  *
445  * 1) mmio registers (IORESOURCE_MEM 0, mandatory)
446  * 2) regulator for controlling the targets power (optional)
447  *    regulator for controlling the AHCI controller (optional)
448  * 3) all clocks specified in the devicetree node, or a single
449  *    clock for non-OF platforms (optional)
450  * 4) resets, if flags has AHCI_PLATFORM_GET_RESETS (optional)
451  * 5) phys (optional)
452  *
453  * RETURNS:
454  * The allocated ahci_host_priv on success, otherwise an ERR_PTR value
455  */
456 struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
457 						   unsigned int flags)
458 {
459 	int child_nodes, rc = -ENOMEM, enabled_ports = 0;
460 	struct device *dev = &pdev->dev;
461 	struct ahci_host_priv *hpriv;
462 	struct device_node *child;
463 	u32 mask_port_map = 0;
464 
465 	if (!devres_open_group(dev, NULL, GFP_KERNEL))
466 		return ERR_PTR(-ENOMEM);
467 
468 	hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv),
469 			     GFP_KERNEL);
470 	if (!hpriv)
471 		goto err_out;
472 
473 	devres_add(dev, hpriv);
474 
475 	/*
476 	 * If the DT provided an "ahci" named resource, use it. Otherwise,
477 	 * fallback to using the default first resource for the device node.
478 	 */
479 	if (platform_get_resource_byname(pdev, IORESOURCE_MEM, "ahci"))
480 		hpriv->mmio = devm_platform_ioremap_resource_byname(pdev, "ahci");
481 	else
482 		hpriv->mmio = devm_platform_ioremap_resource(pdev, 0);
483 	if (IS_ERR(hpriv->mmio)) {
484 		rc = PTR_ERR(hpriv->mmio);
485 		goto err_out;
486 	}
487 
488 	/*
489 	 * Bulk clocks getting procedure can fail to find any clock due to
490 	 * running on a non-OF platform or due to the clocks being defined in
491 	 * bypass of the DT firmware (like da850, spear13xx). In that case we
492 	 * fallback to getting a single clock source right from the dev clocks
493 	 * list.
494 	 */
495 	rc = devm_clk_bulk_get_all(dev, &hpriv->clks);
496 	if (rc < 0)
497 		goto err_out;
498 
499 	if (rc > 0) {
500 		/* Got clocks in bulk */
501 		hpriv->n_clks = rc;
502 	} else {
503 		/*
504 		 * No clock bulk found: fallback to manually getting
505 		 * the optional clock.
506 		 */
507 		hpriv->clks = devm_kzalloc(dev, sizeof(*hpriv->clks), GFP_KERNEL);
508 		if (!hpriv->clks) {
509 			rc = -ENOMEM;
510 			goto err_out;
511 		}
512 		hpriv->clks->clk = devm_clk_get_optional(dev, NULL);
513 		if (IS_ERR(hpriv->clks->clk)) {
514 			rc = PTR_ERR(hpriv->clks->clk);
515 			goto err_out;
516 		} else if (hpriv->clks->clk) {
517 			hpriv->clks->id = "ahci";
518 			hpriv->n_clks = 1;
519 		}
520 	}
521 
522 	hpriv->ahci_regulator = devm_regulator_get(dev, "ahci");
523 	if (IS_ERR(hpriv->ahci_regulator)) {
524 		rc = PTR_ERR(hpriv->ahci_regulator);
525 		if (rc != 0)
526 			goto err_out;
527 	}
528 
529 	hpriv->phy_regulator = devm_regulator_get(dev, "phy");
530 	if (IS_ERR(hpriv->phy_regulator)) {
531 		rc = PTR_ERR(hpriv->phy_regulator);
532 		goto err_out;
533 	}
534 
535 	if (flags & AHCI_PLATFORM_GET_RESETS) {
536 		hpriv->rsts = devm_reset_control_array_get_optional_shared(dev);
537 		if (IS_ERR(hpriv->rsts)) {
538 			rc = PTR_ERR(hpriv->rsts);
539 			goto err_out;
540 		}
541 
542 		hpriv->f_rsts = flags & AHCI_PLATFORM_RST_TRIGGER;
543 	}
544 
545 	/*
546 	 * Too many sub-nodes most likely means having something wrong with
547 	 * the firmware.
548 	 */
549 	child_nodes = of_get_child_count(dev->of_node);
550 	if (child_nodes > AHCI_MAX_PORTS) {
551 		rc = -EINVAL;
552 		goto err_out;
553 	}
554 
555 	/*
556 	 * If no sub-node was found, we still need to set nports to
557 	 * one in order to be able to use the
558 	 * ahci_platform_[en|dis]able_[phys|regulators] functions.
559 	 */
560 	if (child_nodes)
561 		hpriv->nports = child_nodes;
562 	else
563 		hpriv->nports = 1;
564 
565 	hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL);
566 	if (!hpriv->phys) {
567 		rc = -ENOMEM;
568 		goto err_out;
569 	}
570 	/*
571 	 * We cannot use devm_ here, since ahci_platform_put_resources() uses
572 	 * target_pwrs after devm_ have freed memory
573 	 */
574 	hpriv->target_pwrs = kcalloc(hpriv->nports, sizeof(*hpriv->target_pwrs), GFP_KERNEL);
575 	if (!hpriv->target_pwrs) {
576 		rc = -ENOMEM;
577 		goto err_out;
578 	}
579 
580 	if (child_nodes) {
581 		for_each_child_of_node(dev->of_node, child) {
582 			u32 port;
583 			struct platform_device *port_dev __maybe_unused;
584 
585 			if (!of_device_is_available(child))
586 				continue;
587 
588 			if (of_property_read_u32(child, "reg", &port)) {
589 				rc = -EINVAL;
590 				of_node_put(child);
591 				goto err_out;
592 			}
593 
594 			if (port >= hpriv->nports) {
595 				dev_warn(dev, "invalid port number %d\n", port);
596 				continue;
597 			}
598 			mask_port_map |= BIT(port);
599 
600 #ifdef CONFIG_OF_ADDRESS
601 			of_platform_device_create(child, NULL, NULL);
602 
603 			port_dev = of_find_device_by_node(child);
604 
605 			if (port_dev) {
606 				rc = ahci_platform_get_regulator(hpriv, port,
607 								&port_dev->dev);
608 				if (rc == -EPROBE_DEFER) {
609 					of_node_put(child);
610 					goto err_out;
611 				}
612 			}
613 #endif
614 
615 			rc = ahci_platform_get_phy(hpriv, port, dev, child);
616 			if (rc) {
617 				of_node_put(child);
618 				goto err_out;
619 			}
620 
621 			enabled_ports++;
622 		}
623 		if (!enabled_ports) {
624 			dev_warn(dev, "No port enabled\n");
625 			rc = -ENODEV;
626 			goto err_out;
627 		}
628 
629 		if (!hpriv->mask_port_map)
630 			hpriv->mask_port_map = mask_port_map;
631 	} else {
632 		/*
633 		 * If no sub-node was found, keep this for device tree
634 		 * compatibility
635 		 */
636 		rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node);
637 		if (rc)
638 			goto err_out;
639 
640 		rc = ahci_platform_get_regulator(hpriv, 0, dev);
641 		if (rc == -EPROBE_DEFER)
642 			goto err_out;
643 	}
644 
645 	/*
646 	 * Retrieve firmware-specific flags which then will be used to set
647 	 * the HW-init fields of HBA and its ports
648 	 */
649 	rc = ahci_platform_get_firmware(hpriv, dev);
650 	if (rc)
651 		goto err_out;
652 
653 	pm_runtime_enable(dev);
654 	pm_runtime_get_sync(dev);
655 	hpriv->got_runtime_pm = true;
656 
657 	devres_remove_group(dev, NULL);
658 	return hpriv;
659 
660 err_out:
661 	devres_release_group(dev, NULL);
662 	return ERR_PTR(rc);
663 }
664 EXPORT_SYMBOL_GPL(ahci_platform_get_resources);
665 
666 /**
667  * ahci_platform_init_host - Bring up an ahci-platform host
668  * @pdev: platform device pointer for the host
669  * @hpriv: ahci-host private data for the host
670  * @pi_template: template for the ata_port_info to use
671  * @sht: scsi_host_template to use when registering
672  *
673  * This function does all the usual steps needed to bring up an
674  * ahci-platform host, note any necessary resources (ie clks, phys, etc.)
675  * must be initialized / enabled before calling this.
676  *
677  * RETURNS:
678  * 0 on success otherwise a negative error code
679  */
680 int ahci_platform_init_host(struct platform_device *pdev,
681 			    struct ahci_host_priv *hpriv,
682 			    const struct ata_port_info *pi_template,
683 			    const struct scsi_host_template *sht)
684 {
685 	struct device *dev = &pdev->dev;
686 	struct ata_port_info pi = *pi_template;
687 	const struct ata_port_info *ppi[] = { &pi, NULL };
688 	struct ata_host *host;
689 	int i, irq, n_ports, rc;
690 
691 	irq = platform_get_irq(pdev, 0);
692 	if (irq < 0)
693 		return irq;
694 	if (!irq)
695 		return -EINVAL;
696 
697 	hpriv->irq = irq;
698 
699 	/* prepare host */
700 	pi.private_data = (void *)(unsigned long)hpriv->flags;
701 
702 	ahci_save_initial_config(dev, hpriv);
703 
704 	if (hpriv->cap & HOST_CAP_NCQ)
705 		pi.flags |= ATA_FLAG_NCQ;
706 
707 	if (hpriv->cap & HOST_CAP_PMP)
708 		pi.flags |= ATA_FLAG_PMP;
709 
710 	ahci_set_em_messages(hpriv, &pi);
711 
712 	/* CAP.NP sometimes indicate the index of the last enabled
713 	 * port, at other times, that of the last possible port, so
714 	 * determining the maximum port number requires looking at
715 	 * both CAP.NP and port_map.
716 	 */
717 	n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
718 
719 	host = ata_host_alloc_pinfo(dev, ppi, n_ports);
720 	if (!host)
721 		return -ENOMEM;
722 
723 	host->private_data = hpriv;
724 
725 	if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
726 		host->flags |= ATA_HOST_PARALLEL_SCAN;
727 	else
728 		dev_info(dev, "SSS flag set, parallel bus scan disabled\n");
729 
730 	if (pi.flags & ATA_FLAG_EM)
731 		ahci_reset_em(host);
732 
733 	for (i = 0; i < host->n_ports; i++) {
734 		struct ata_port *ap = host->ports[i];
735 
736 		ata_port_desc(ap, "mmio %pR",
737 			      platform_get_resource(pdev, IORESOURCE_MEM, 0));
738 		ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
739 
740 		/* set enclosure management message type */
741 		if (ap->flags & ATA_FLAG_EM)
742 			ap->em_message_type = hpriv->em_msg_type;
743 
744 		/* disabled/not-implemented port */
745 		if (!(hpriv->port_map & (1 << i)))
746 			ap->ops = &ata_dummy_port_ops;
747 	}
748 
749 	if (hpriv->cap & HOST_CAP_64) {
750 		rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
751 		if (rc) {
752 			dev_err(dev, "Failed to enable 64-bit DMA.\n");
753 			return rc;
754 		}
755 	}
756 
757 	rc = ahci_reset_controller(host);
758 	if (rc)
759 		return rc;
760 
761 	ahci_init_controller(host);
762 	ahci_print_info(host, "platform");
763 
764 	return ahci_host_activate(host, sht);
765 }
766 EXPORT_SYMBOL_GPL(ahci_platform_init_host);
767 
768 static void ahci_host_stop(struct ata_host *host)
769 {
770 	struct ahci_host_priv *hpriv = host->private_data;
771 
772 	ahci_platform_disable_resources(hpriv);
773 }
774 
775 /**
776  * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports
777  * @pdev: platform device pointer for the host
778  *
779  * This function is called during system shutdown and performs the minimal
780  * deconfiguration required to ensure that an ahci_platform host cannot
781  * corrupt or otherwise interfere with a new kernel being started with kexec.
782  */
783 void ahci_platform_shutdown(struct platform_device *pdev)
784 {
785 	struct ata_host *host = platform_get_drvdata(pdev);
786 	struct ahci_host_priv *hpriv = host->private_data;
787 	void __iomem *mmio = hpriv->mmio;
788 	int i;
789 
790 	for (i = 0; i < host->n_ports; i++) {
791 		struct ata_port *ap = host->ports[i];
792 
793 		/* Disable port interrupts */
794 		if (ap->ops->freeze)
795 			ap->ops->freeze(ap);
796 
797 		/* Stop the port DMA engines */
798 		if (ap->ops->port_stop)
799 			ap->ops->port_stop(ap);
800 	}
801 
802 	/* Disable and clear host interrupts */
803 	writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL);
804 	readl(mmio + HOST_CTL); /* flush */
805 	writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT);
806 }
807 EXPORT_SYMBOL_GPL(ahci_platform_shutdown);
808 
809 #ifdef CONFIG_PM_SLEEP
810 /**
811  * ahci_platform_suspend_host - Suspend an ahci-platform host
812  * @dev: device pointer for the host
813  *
814  * This function does all the usual steps needed to suspend an
815  * ahci-platform host, note any necessary resources (ie clks, phys, etc.)
816  * must be disabled after calling this.
817  *
818  * RETURNS:
819  * 0 on success otherwise a negative error code
820  */
821 int ahci_platform_suspend_host(struct device *dev)
822 {
823 	struct ata_host *host = dev_get_drvdata(dev);
824 	struct ahci_host_priv *hpriv = host->private_data;
825 	void __iomem *mmio = hpriv->mmio;
826 	u32 ctl;
827 
828 	if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
829 		dev_err(dev, "firmware update required for suspend/resume\n");
830 		return -EIO;
831 	}
832 
833 	/*
834 	 * AHCI spec rev1.1 section 8.3.3:
835 	 * Software must disable interrupts prior to requesting a
836 	 * transition of the HBA to D3 state.
837 	 */
838 	ctl = readl(mmio + HOST_CTL);
839 	ctl &= ~HOST_IRQ_EN;
840 	writel(ctl, mmio + HOST_CTL);
841 	readl(mmio + HOST_CTL); /* flush */
842 
843 	if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS)
844 		ahci_platform_disable_phys(hpriv);
845 
846 	ata_host_suspend(host, PMSG_SUSPEND);
847 	return 0;
848 }
849 EXPORT_SYMBOL_GPL(ahci_platform_suspend_host);
850 
851 /**
852  * ahci_platform_resume_host - Resume an ahci-platform host
853  * @dev: device pointer for the host
854  *
855  * This function does all the usual steps needed to resume an ahci-platform
856  * host, note any necessary resources (ie clks, phys, etc.)  must be
857  * initialized / enabled before calling this.
858  *
859  * RETURNS:
860  * 0 on success otherwise a negative error code
861  */
862 int ahci_platform_resume_host(struct device *dev)
863 {
864 	struct ata_host *host = dev_get_drvdata(dev);
865 	struct ahci_host_priv *hpriv = host->private_data;
866 	int rc;
867 
868 	if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
869 		rc = ahci_reset_controller(host);
870 		if (rc)
871 			return rc;
872 
873 		ahci_init_controller(host);
874 	}
875 
876 	if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS)
877 		ahci_platform_enable_phys(hpriv);
878 
879 	ata_host_resume(host);
880 
881 	return 0;
882 }
883 EXPORT_SYMBOL_GPL(ahci_platform_resume_host);
884 
885 /**
886  * ahci_platform_suspend - Suspend an ahci-platform device
887  * @dev: the platform device to suspend
888  *
889  * This function suspends the host associated with the device, followed by
890  * disabling all the resources of the device.
891  *
892  * RETURNS:
893  * 0 on success otherwise a negative error code
894  */
895 int ahci_platform_suspend(struct device *dev)
896 {
897 	struct ata_host *host = dev_get_drvdata(dev);
898 	struct ahci_host_priv *hpriv = host->private_data;
899 	int rc;
900 
901 	rc = ahci_platform_suspend_host(dev);
902 	if (rc)
903 		return rc;
904 
905 	ahci_platform_disable_resources(hpriv);
906 
907 	return 0;
908 }
909 EXPORT_SYMBOL_GPL(ahci_platform_suspend);
910 
911 /**
912  * ahci_platform_resume - Resume an ahci-platform device
913  * @dev: the platform device to resume
914  *
915  * This function enables all the resources of the device followed by
916  * resuming the host associated with the device.
917  *
918  * RETURNS:
919  * 0 on success otherwise a negative error code
920  */
921 int ahci_platform_resume(struct device *dev)
922 {
923 	struct ata_host *host = dev_get_drvdata(dev);
924 	struct ahci_host_priv *hpriv = host->private_data;
925 	int rc;
926 
927 	rc = ahci_platform_enable_resources(hpriv);
928 	if (rc)
929 		return rc;
930 
931 	rc = ahci_platform_resume_host(dev);
932 	if (rc)
933 		goto disable_resources;
934 
935 	/* We resumed so update PM runtime state */
936 	pm_runtime_disable(dev);
937 	pm_runtime_set_active(dev);
938 	pm_runtime_enable(dev);
939 
940 	return 0;
941 
942 disable_resources:
943 	ahci_platform_disable_resources(hpriv);
944 
945 	return rc;
946 }
947 EXPORT_SYMBOL_GPL(ahci_platform_resume);
948 #endif
949 
950 MODULE_DESCRIPTION("AHCI SATA platform library");
951 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
952 MODULE_LICENSE("GPL");
953