xref: /openbmc/linux/drivers/usb/host/fhci-hcd.c (revision 022dacdd) 
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Freescale QUICC Engine USB Host Controller Driver
4  *
5  * Copyright (c) Freescale Semicondutor, Inc. 2006.
6  *               Shlomi Gridish <gridish@freescale.com>
7  *               Jerry Huang <Chang-Ming.Huang@freescale.com>
8  * Copyright (c) Logic Product Development, Inc. 2007
9  *               Peter Barada <peterb@logicpd.com>
10  * Copyright (c) MontaVista Software, Inc. 2008.
11  *               Anton Vorontsov <avorontsov@ru.mvista.com>
12  */
13 
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/spinlock.h>
17 #include <linux/kernel.h>
18 #include <linux/delay.h>
19 #include <linux/errno.h>
20 #include <linux/list.h>
21 #include <linux/interrupt.h>
22 #include <linux/io.h>
23 #include <linux/usb.h>
24 #include <linux/usb/hcd.h>
25 #include <linux/of_address.h>
26 #include <linux/of_irq.h>
27 #include <linux/of_platform.h>
28 #include <linux/of_gpio.h>
29 #include <linux/slab.h>
30 #include <soc/fsl/qe/qe.h>
31 #include <asm/fsl_gtm.h>
32 #include "fhci.h"
33 
34 void fhci_start_sof_timer(struct fhci_hcd *fhci)
35 {
36 	fhci_dbg(fhci, "-> %s\n", __func__);
37 
38 	/* clear frame_n */
39 	out_be16(&fhci->pram->frame_num, 0);
40 
41 	out_be16(&fhci->regs->usb_ussft, 0);
42 	setbits8(&fhci->regs->usb_usmod, USB_MODE_SFTE);
43 
44 	fhci_dbg(fhci, "<- %s\n", __func__);
45 }
46 
47 void fhci_stop_sof_timer(struct fhci_hcd *fhci)
48 {
49 	fhci_dbg(fhci, "-> %s\n", __func__);
50 
51 	clrbits8(&fhci->regs->usb_usmod, USB_MODE_SFTE);
52 	gtm_stop_timer16(fhci->timer);
53 
54 	fhci_dbg(fhci, "<- %s\n", __func__);
55 }
56 
57 u16 fhci_get_sof_timer_count(struct fhci_usb *usb)
58 {
59 	return be16_to_cpu(in_be16(&usb->fhci->regs->usb_ussft) / 12);
60 }
61 
62 /* initialize the endpoint zero */
63 static u32 endpoint_zero_init(struct fhci_usb *usb,
64 			      enum fhci_mem_alloc data_mem,
65 			      u32 ring_len)
66 {
67 	u32 rc;
68 
69 	rc = fhci_create_ep(usb, data_mem, ring_len);
70 	if (rc)
71 		return rc;
72 
73 	/* inilialize endpoint registers */
74 	fhci_init_ep_registers(usb, usb->ep0, data_mem);
75 
76 	return 0;
77 }
78 
79 /* enable the USB interrupts */
80 void fhci_usb_enable_interrupt(struct fhci_usb *usb)
81 {
82 	struct fhci_hcd *fhci = usb->fhci;
83 
84 	if (usb->intr_nesting_cnt == 1) {
85 		/* initialize the USB interrupt */
86 		enable_irq(fhci_to_hcd(fhci)->irq);
87 
88 		/* initialize the event register and mask register */
89 		out_be16(&usb->fhci->regs->usb_usber, 0xffff);
90 		out_be16(&usb->fhci->regs->usb_usbmr, usb->saved_msk);
91 
92 		/* enable the timer interrupts */
93 		enable_irq(fhci->timer->irq);
94 	} else if (usb->intr_nesting_cnt > 1)
95 		fhci_info(fhci, "unbalanced USB interrupts nesting\n");
96 	usb->intr_nesting_cnt--;
97 }
98 
99 /* disable the usb interrupt */
100 void fhci_usb_disable_interrupt(struct fhci_usb *usb)
101 {
102 	struct fhci_hcd *fhci = usb->fhci;
103 
104 	if (usb->intr_nesting_cnt == 0) {
105 		/* disable the timer interrupt */
106 		disable_irq_nosync(fhci->timer->irq);
107 
108 		/* disable the usb interrupt */
109 		disable_irq_nosync(fhci_to_hcd(fhci)->irq);
110 		out_be16(&usb->fhci->regs->usb_usbmr, 0);
111 	}
112 	usb->intr_nesting_cnt++;
113 }
114 
115 /* enable the USB controller */
116 static u32 fhci_usb_enable(struct fhci_hcd *fhci)
117 {
118 	struct fhci_usb *usb = fhci->usb_lld;
119 
120 	out_be16(&usb->fhci->regs->usb_usber, 0xffff);
121 	out_be16(&usb->fhci->regs->usb_usbmr, usb->saved_msk);
122 	setbits8(&usb->fhci->regs->usb_usmod, USB_MODE_EN);
123 
124 	mdelay(100);
125 
126 	return 0;
127 }
128 
129 /* disable the USB controller */
130 static u32 fhci_usb_disable(struct fhci_hcd *fhci)
131 {
132 	struct fhci_usb *usb = fhci->usb_lld;
133 
134 	fhci_usb_disable_interrupt(usb);
135 	fhci_port_disable(fhci);
136 
137 	/* disable the usb controller */
138 	if (usb->port_status == FHCI_PORT_FULL ||
139 			usb->port_status == FHCI_PORT_LOW)
140 		fhci_device_disconnected_interrupt(fhci);
141 
142 	clrbits8(&usb->fhci->regs->usb_usmod, USB_MODE_EN);
143 
144 	return 0;
145 }
146 
147 /* check the bus state by polling the QE bit on the IO ports */
148 int fhci_ioports_check_bus_state(struct fhci_hcd *fhci)
149 {
150 	u8 bits = 0;
151 
152 	/* check USBOE,if transmitting,exit */
153 	if (!gpio_get_value(fhci->gpios[GPIO_USBOE]))
154 		return -1;
155 
156 	/* check USBRP */
157 	if (gpio_get_value(fhci->gpios[GPIO_USBRP]))
158 		bits |= 0x2;
159 
160 	/* check USBRN */
161 	if (gpio_get_value(fhci->gpios[GPIO_USBRN]))
162 		bits |= 0x1;
163 
164 	return bits;
165 }
166 
167 static void fhci_mem_free(struct fhci_hcd *fhci)
168 {
169 	struct ed *ed;
170 	struct ed *next_ed;
171 	struct td *td;
172 	struct td *next_td;
173 
174 	list_for_each_entry_safe(ed, next_ed, &fhci->empty_eds, node) {
175 		list_del(&ed->node);
176 		kfree(ed);
177 	}
178 
179 	list_for_each_entry_safe(td, next_td, &fhci->empty_tds, node) {
180 		list_del(&td->node);
181 		kfree(td);
182 	}
183 
184 	kfree(fhci->vroot_hub);
185 	fhci->vroot_hub = NULL;
186 
187 	kfree(fhci->hc_list);
188 	fhci->hc_list = NULL;
189 }
190 
191 static int fhci_mem_init(struct fhci_hcd *fhci)
192 {
193 	int i;
194 
195 	fhci->hc_list = kzalloc(sizeof(*fhci->hc_list), GFP_KERNEL);
196 	if (!fhci->hc_list)
197 		goto err;
198 
199 	INIT_LIST_HEAD(&fhci->hc_list->ctrl_list);
200 	INIT_LIST_HEAD(&fhci->hc_list->bulk_list);
201 	INIT_LIST_HEAD(&fhci->hc_list->iso_list);
202 	INIT_LIST_HEAD(&fhci->hc_list->intr_list);
203 	INIT_LIST_HEAD(&fhci->hc_list->done_list);
204 
205 	fhci->vroot_hub = kzalloc(sizeof(*fhci->vroot_hub), GFP_KERNEL);
206 	if (!fhci->vroot_hub)
207 		goto err;
208 
209 	INIT_LIST_HEAD(&fhci->empty_eds);
210 	INIT_LIST_HEAD(&fhci->empty_tds);
211 
212 	/* initialize work queue to handle done list */
213 	fhci_tasklet.data = (unsigned long)fhci;
214 	fhci->process_done_task = &fhci_tasklet;
215 
216 	for (i = 0; i < MAX_TDS; i++) {
217 		struct td *td;
218 
219 		td = kmalloc(sizeof(*td), GFP_KERNEL);
220 		if (!td)
221 			goto err;
222 		fhci_recycle_empty_td(fhci, td);
223 	}
224 	for (i = 0; i < MAX_EDS; i++) {
225 		struct ed *ed;
226 
227 		ed = kmalloc(sizeof(*ed), GFP_KERNEL);
228 		if (!ed)
229 			goto err;
230 		fhci_recycle_empty_ed(fhci, ed);
231 	}
232 
233 	fhci->active_urbs = 0;
234 	return 0;
235 err:
236 	fhci_mem_free(fhci);
237 	return -ENOMEM;
238 }
239 
240 /* destroy the fhci_usb structure */
241 static void fhci_usb_free(void *lld)
242 {
243 	struct fhci_usb *usb = lld;
244 	struct fhci_hcd *fhci;
245 
246 	if (usb) {
247 		fhci = usb->fhci;
248 		fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
249 		fhci_ep0_free(usb);
250 		kfree(usb->actual_frame);
251 		kfree(usb);
252 	}
253 }
254 
255 /* initialize the USB */
256 static int fhci_usb_init(struct fhci_hcd *fhci)
257 {
258 	struct fhci_usb *usb = fhci->usb_lld;
259 
260 	memset_io(usb->fhci->pram, 0, FHCI_PRAM_SIZE);
261 
262 	usb->port_status = FHCI_PORT_DISABLED;
263 	usb->max_frame_usage = FRAME_TIME_USAGE;
264 	usb->sw_transaction_time = SW_FIX_TIME_BETWEEN_TRANSACTION;
265 
266 	usb->actual_frame = kzalloc(sizeof(*usb->actual_frame), GFP_KERNEL);
267 	if (!usb->actual_frame) {
268 		fhci_usb_free(usb);
269 		return -ENOMEM;
270 	}
271 
272 	INIT_LIST_HEAD(&usb->actual_frame->tds_list);
273 
274 	/* initializing registers on chip, clear frame number */
275 	out_be16(&fhci->pram->frame_num, 0);
276 
277 	/* clear rx state */
278 	out_be32(&fhci->pram->rx_state, 0);
279 
280 	/* set mask register */
281 	usb->saved_msk = (USB_E_TXB_MASK |
282 			  USB_E_TXE1_MASK |
283 			  USB_E_IDLE_MASK |
284 			  USB_E_RESET_MASK | USB_E_SFT_MASK | USB_E_MSF_MASK);
285 
286 	out_8(&usb->fhci->regs->usb_usmod, USB_MODE_HOST | USB_MODE_EN);
287 
288 	/* clearing the mask register */
289 	out_be16(&usb->fhci->regs->usb_usbmr, 0);
290 
291 	/* initialing the event register */
292 	out_be16(&usb->fhci->regs->usb_usber, 0xffff);
293 
294 	if (endpoint_zero_init(usb, DEFAULT_DATA_MEM, DEFAULT_RING_LEN) != 0) {
295 		fhci_usb_free(usb);
296 		return -EINVAL;
297 	}
298 
299 	return 0;
300 }
301 
302 /* initialize the fhci_usb struct and the corresponding data staruct */
303 static struct fhci_usb *fhci_create_lld(struct fhci_hcd *fhci)
304 {
305 	struct fhci_usb *usb;
306 
307 	/* allocate memory for SCC data structure */
308 	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
309 	if (!usb)
310 		return NULL;
311 
312 	usb->fhci = fhci;
313 	usb->hc_list = fhci->hc_list;
314 	usb->vroot_hub = fhci->vroot_hub;
315 
316 	usb->transfer_confirm = fhci_transfer_confirm_callback;
317 
318 	return usb;
319 }
320 
321 static int fhci_start(struct usb_hcd *hcd)
322 {
323 	int ret;
324 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
325 
326 	ret = fhci_mem_init(fhci);
327 	if (ret) {
328 		fhci_err(fhci, "failed to allocate memory\n");
329 		goto err;
330 	}
331 
332 	fhci->usb_lld = fhci_create_lld(fhci);
333 	if (!fhci->usb_lld) {
334 		fhci_err(fhci, "low level driver config failed\n");
335 		ret = -ENOMEM;
336 		goto err;
337 	}
338 
339 	ret = fhci_usb_init(fhci);
340 	if (ret) {
341 		fhci_err(fhci, "low level driver initialize failed\n");
342 		goto err;
343 	}
344 
345 	spin_lock_init(&fhci->lock);
346 
347 	/* connect the virtual root hub */
348 	fhci->vroot_hub->dev_num = 1;	/* this field may be needed to fix */
349 	fhci->vroot_hub->hub.wHubStatus = 0;
350 	fhci->vroot_hub->hub.wHubChange = 0;
351 	fhci->vroot_hub->port.wPortStatus = 0;
352 	fhci->vroot_hub->port.wPortChange = 0;
353 
354 	hcd->state = HC_STATE_RUNNING;
355 
356 	/*
357 	 * From here on, hub_wq concurrently accesses the root
358 	 * hub; drivers will be talking to enumerated devices.
359 	 * (On restart paths, hub_wq already knows about the root
360 	 * hub and could find work as soon as we wrote FLAG_CF.)
361 	 *
362 	 * Before this point the HC was idle/ready.  After, hub_wq
363 	 * and device drivers may start it running.
364 	 */
365 	fhci_usb_enable(fhci);
366 	return 0;
367 err:
368 	fhci_mem_free(fhci);
369 	return ret;
370 }
371 
372 static void fhci_stop(struct usb_hcd *hcd)
373 {
374 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
375 
376 	fhci_usb_disable_interrupt(fhci->usb_lld);
377 	fhci_usb_disable(fhci);
378 
379 	fhci_usb_free(fhci->usb_lld);
380 	fhci->usb_lld = NULL;
381 	fhci_mem_free(fhci);
382 }
383 
384 static int fhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
385 			    gfp_t mem_flags)
386 {
387 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
388 	u32 pipe = urb->pipe;
389 	int ret;
390 	int i;
391 	int size = 0;
392 	struct urb_priv *urb_priv;
393 	unsigned long flags;
394 
395 	switch (usb_pipetype(pipe)) {
396 	case PIPE_CONTROL:
397 		/* 1 td fro setup,1 for ack */
398 		size = 2;
399 		fallthrough;
400 	case PIPE_BULK:
401 		/* one td for every 4096 bytes(can be up to 8k) */
402 		size += urb->transfer_buffer_length / 4096;
403 		/* ...add for any remaining bytes... */
404 		if ((urb->transfer_buffer_length % 4096) != 0)
405 			size++;
406 		/* ..and maybe a zero length packet to wrap it up */
407 		if (size == 0)
408 			size++;
409 		else if ((urb->transfer_flags & URB_ZERO_PACKET) != 0
410 			 && (urb->transfer_buffer_length
411 			     % usb_maxpacket(urb->dev, pipe,
412 					     usb_pipeout(pipe))) != 0)
413 			size++;
414 		break;
415 	case PIPE_ISOCHRONOUS:
416 		size = urb->number_of_packets;
417 		if (size <= 0)
418 			return -EINVAL;
419 		for (i = 0; i < urb->number_of_packets; i++) {
420 			urb->iso_frame_desc[i].actual_length = 0;
421 			urb->iso_frame_desc[i].status = (u32) (-EXDEV);
422 		}
423 		break;
424 	case PIPE_INTERRUPT:
425 		size = 1;
426 	}
427 
428 	/* allocate the private part of the URB */
429 	urb_priv = kzalloc(sizeof(*urb_priv), mem_flags);
430 	if (!urb_priv)
431 		return -ENOMEM;
432 
433 	/* allocate the private part of the URB */
434 	urb_priv->tds = kcalloc(size, sizeof(*urb_priv->tds), mem_flags);
435 	if (!urb_priv->tds) {
436 		kfree(urb_priv);
437 		return -ENOMEM;
438 	}
439 
440 	spin_lock_irqsave(&fhci->lock, flags);
441 
442 	ret = usb_hcd_link_urb_to_ep(hcd, urb);
443 	if (ret)
444 		goto err;
445 
446 	/* fill the private part of the URB */
447 	urb_priv->num_of_tds = size;
448 
449 	urb->status = -EINPROGRESS;
450 	urb->actual_length = 0;
451 	urb->error_count = 0;
452 	urb->hcpriv = urb_priv;
453 
454 	fhci_queue_urb(fhci, urb);
455 err:
456 	if (ret) {
457 		kfree(urb_priv->tds);
458 		kfree(urb_priv);
459 	}
460 	spin_unlock_irqrestore(&fhci->lock, flags);
461 	return ret;
462 }
463 
464 /* dequeue FHCI URB */
465 static int fhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
466 {
467 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
468 	struct fhci_usb *usb = fhci->usb_lld;
469 	int ret = -EINVAL;
470 	unsigned long flags;
471 
472 	if (!urb || !urb->dev || !urb->dev->bus)
473 		goto out;
474 
475 	spin_lock_irqsave(&fhci->lock, flags);
476 
477 	ret = usb_hcd_check_unlink_urb(hcd, urb, status);
478 	if (ret)
479 		goto out2;
480 
481 	if (usb->port_status != FHCI_PORT_DISABLED) {
482 		struct urb_priv *urb_priv;
483 
484 		/*
485 		 * flag the urb's data for deletion in some upcoming
486 		 * SF interrupt's delete list processing
487 		 */
488 		urb_priv = urb->hcpriv;
489 
490 		if (!urb_priv || (urb_priv->state == URB_DEL))
491 			goto out2;
492 
493 		urb_priv->state = URB_DEL;
494 
495 		/* already pending? */
496 		urb_priv->ed->state = FHCI_ED_URB_DEL;
497 	} else {
498 		fhci_urb_complete_free(fhci, urb);
499 	}
500 
501 out2:
502 	spin_unlock_irqrestore(&fhci->lock, flags);
503 out:
504 	return ret;
505 }
506 
507 static void fhci_endpoint_disable(struct usb_hcd *hcd,
508 				  struct usb_host_endpoint *ep)
509 {
510 	struct fhci_hcd *fhci;
511 	struct ed *ed;
512 	unsigned long flags;
513 
514 	fhci = hcd_to_fhci(hcd);
515 	spin_lock_irqsave(&fhci->lock, flags);
516 	ed = ep->hcpriv;
517 	if (ed) {
518 		while (ed->td_head != NULL) {
519 			struct td *td = fhci_remove_td_from_ed(ed);
520 			fhci_urb_complete_free(fhci, td->urb);
521 		}
522 		fhci_recycle_empty_ed(fhci, ed);
523 		ep->hcpriv = NULL;
524 	}
525 	spin_unlock_irqrestore(&fhci->lock, flags);
526 }
527 
528 static int fhci_get_frame_number(struct usb_hcd *hcd)
529 {
530 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
531 
532 	return get_frame_num(fhci);
533 }
534 
535 static const struct hc_driver fhci_driver = {
536 	.description = "fsl,usb-fhci",
537 	.product_desc = "FHCI HOST Controller",
538 	.hcd_priv_size = sizeof(struct fhci_hcd),
539 
540 	/* generic hardware linkage */
541 	.irq = fhci_irq,
542 	.flags = HCD_DMA | HCD_USB11 | HCD_MEMORY,
543 
544 	/* basic lifecycle operation */
545 	.start = fhci_start,
546 	.stop = fhci_stop,
547 
548 	/* managing i/o requests and associated device resources */
549 	.urb_enqueue = fhci_urb_enqueue,
550 	.urb_dequeue = fhci_urb_dequeue,
551 	.endpoint_disable = fhci_endpoint_disable,
552 
553 	/* scheduling support */
554 	.get_frame_number = fhci_get_frame_number,
555 
556 	/* root hub support */
557 	.hub_status_data = fhci_hub_status_data,
558 	.hub_control = fhci_hub_control,
559 };
560 
561 static int of_fhci_probe(struct platform_device *ofdev)
562 {
563 	struct device *dev = &ofdev->dev;
564 	struct device_node *node = dev->of_node;
565 	struct usb_hcd *hcd;
566 	struct fhci_hcd *fhci;
567 	struct resource usb_regs;
568 	unsigned long pram_addr;
569 	unsigned int usb_irq;
570 	const char *sprop;
571 	const u32 *iprop;
572 	int size;
573 	int ret;
574 	int i;
575 	int j;
576 
577 	if (usb_disabled())
578 		return -ENODEV;
579 
580 	sprop = of_get_property(node, "mode", NULL);
581 	if (sprop && strcmp(sprop, "host"))
582 		return -ENODEV;
583 
584 	hcd = usb_create_hcd(&fhci_driver, dev, dev_name(dev));
585 	if (!hcd) {
586 		dev_err(dev, "could not create hcd\n");
587 		return -ENOMEM;
588 	}
589 
590 	fhci = hcd_to_fhci(hcd);
591 	hcd->self.controller = dev;
592 	dev_set_drvdata(dev, hcd);
593 
594 	iprop = of_get_property(node, "hub-power-budget", &size);
595 	if (iprop && size == sizeof(*iprop))
596 		hcd->power_budget = *iprop;
597 
598 	/* FHCI registers. */
599 	ret = of_address_to_resource(node, 0, &usb_regs);
600 	if (ret) {
601 		dev_err(dev, "could not get regs\n");
602 		goto err_regs;
603 	}
604 
605 	hcd->regs = ioremap(usb_regs.start, resource_size(&usb_regs));
606 	if (!hcd->regs) {
607 		dev_err(dev, "could not ioremap regs\n");
608 		ret = -ENOMEM;
609 		goto err_regs;
610 	}
611 	fhci->regs = hcd->regs;
612 
613 	/* Parameter RAM. */
614 	iprop = of_get_property(node, "reg", &size);
615 	if (!iprop || size < sizeof(*iprop) * 4) {
616 		dev_err(dev, "can't get pram offset\n");
617 		ret = -EINVAL;
618 		goto err_pram;
619 	}
620 
621 	pram_addr = cpm_muram_alloc(FHCI_PRAM_SIZE, 64);
622 	if (IS_ERR_VALUE(pram_addr)) {
623 		dev_err(dev, "failed to allocate usb pram\n");
624 		ret = -ENOMEM;
625 		goto err_pram;
626 	}
627 
628 	qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, QE_CR_SUBBLOCK_USB,
629 		     QE_CR_PROTOCOL_UNSPECIFIED, pram_addr);
630 	fhci->pram = cpm_muram_addr(pram_addr);
631 
632 	/* GPIOs and pins */
633 	for (i = 0; i < NUM_GPIOS; i++) {
634 		int gpio;
635 		enum of_gpio_flags flags;
636 
637 		gpio = of_get_gpio_flags(node, i, &flags);
638 		fhci->gpios[i] = gpio;
639 		fhci->alow_gpios[i] = flags & OF_GPIO_ACTIVE_LOW;
640 
641 		if (!gpio_is_valid(gpio)) {
642 			if (i < GPIO_SPEED) {
643 				dev_err(dev, "incorrect GPIO%d: %d\n",
644 					i, gpio);
645 				goto err_gpios;
646 			} else {
647 				dev_info(dev, "assuming board doesn't have "
648 					"%s gpio\n", i == GPIO_SPEED ?
649 					"speed" : "power");
650 				continue;
651 			}
652 		}
653 
654 		ret = gpio_request(gpio, dev_name(dev));
655 		if (ret) {
656 			dev_err(dev, "failed to request gpio %d", i);
657 			goto err_gpios;
658 		}
659 
660 		if (i >= GPIO_SPEED) {
661 			ret = gpio_direction_output(gpio, 0);
662 			if (ret) {
663 				dev_err(dev, "failed to set gpio %d as "
664 					"an output\n", i);
665 				i++;
666 				goto err_gpios;
667 			}
668 		}
669 	}
670 
671 	for (j = 0; j < NUM_PINS; j++) {
672 		fhci->pins[j] = qe_pin_request(node, j);
673 		if (IS_ERR(fhci->pins[j])) {
674 			ret = PTR_ERR(fhci->pins[j]);
675 			dev_err(dev, "can't get pin %d: %d\n", j, ret);
676 			goto err_pins;
677 		}
678 	}
679 
680 	/* Frame limit timer and its interrupt. */
681 	fhci->timer = gtm_get_timer16();
682 	if (IS_ERR(fhci->timer)) {
683 		ret = PTR_ERR(fhci->timer);
684 		dev_err(dev, "failed to request qe timer: %i", ret);
685 		goto err_get_timer;
686 	}
687 
688 	ret = request_irq(fhci->timer->irq, fhci_frame_limit_timer_irq,
689 			  0, "qe timer (usb)", hcd);
690 	if (ret) {
691 		dev_err(dev, "failed to request timer irq");
692 		goto err_timer_irq;
693 	}
694 
695 	/* USB Host interrupt. */
696 	usb_irq = irq_of_parse_and_map(node, 0);
697 	if (usb_irq == NO_IRQ) {
698 		dev_err(dev, "could not get usb irq\n");
699 		ret = -EINVAL;
700 		goto err_usb_irq;
701 	}
702 
703 	/* Clocks. */
704 	sprop = of_get_property(node, "fsl,fullspeed-clock", NULL);
705 	if (sprop) {
706 		fhci->fullspeed_clk = qe_clock_source(sprop);
707 		if (fhci->fullspeed_clk == QE_CLK_DUMMY) {
708 			dev_err(dev, "wrong fullspeed-clock\n");
709 			ret = -EINVAL;
710 			goto err_clocks;
711 		}
712 	}
713 
714 	sprop = of_get_property(node, "fsl,lowspeed-clock", NULL);
715 	if (sprop) {
716 		fhci->lowspeed_clk = qe_clock_source(sprop);
717 		if (fhci->lowspeed_clk == QE_CLK_DUMMY) {
718 			dev_err(dev, "wrong lowspeed-clock\n");
719 			ret = -EINVAL;
720 			goto err_clocks;
721 		}
722 	}
723 
724 	if (fhci->fullspeed_clk == QE_CLK_NONE &&
725 			fhci->lowspeed_clk == QE_CLK_NONE) {
726 		dev_err(dev, "no clocks specified\n");
727 		ret = -EINVAL;
728 		goto err_clocks;
729 	}
730 
731 	dev_info(dev, "at 0x%p, irq %d\n", hcd->regs, usb_irq);
732 
733 	fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
734 
735 	/* Start with full-speed, if possible. */
736 	if (fhci->fullspeed_clk != QE_CLK_NONE) {
737 		fhci_config_transceiver(fhci, FHCI_PORT_FULL);
738 		qe_usb_clock_set(fhci->fullspeed_clk, USB_CLOCK);
739 	} else {
740 		fhci_config_transceiver(fhci, FHCI_PORT_LOW);
741 		qe_usb_clock_set(fhci->lowspeed_clk, USB_CLOCK >> 3);
742 	}
743 
744 	/* Clear and disable any pending interrupts. */
745 	out_be16(&fhci->regs->usb_usber, 0xffff);
746 	out_be16(&fhci->regs->usb_usbmr, 0);
747 
748 	ret = usb_add_hcd(hcd, usb_irq, 0);
749 	if (ret < 0)
750 		goto err_add_hcd;
751 
752 	device_wakeup_enable(hcd->self.controller);
753 
754 	fhci_dfs_create(fhci);
755 
756 	return 0;
757 
758 err_add_hcd:
759 err_clocks:
760 	irq_dispose_mapping(usb_irq);
761 err_usb_irq:
762 	free_irq(fhci->timer->irq, hcd);
763 err_timer_irq:
764 	gtm_put_timer16(fhci->timer);
765 err_get_timer:
766 err_pins:
767 	while (--j >= 0)
768 		qe_pin_free(fhci->pins[j]);
769 err_gpios:
770 	while (--i >= 0) {
771 		if (gpio_is_valid(fhci->gpios[i]))
772 			gpio_free(fhci->gpios[i]);
773 	}
774 	cpm_muram_free(pram_addr);
775 err_pram:
776 	iounmap(hcd->regs);
777 err_regs:
778 	usb_put_hcd(hcd);
779 	return ret;
780 }
781 
782 static int fhci_remove(struct device *dev)
783 {
784 	struct usb_hcd *hcd = dev_get_drvdata(dev);
785 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
786 	int i;
787 	int j;
788 
789 	usb_remove_hcd(hcd);
790 	free_irq(fhci->timer->irq, hcd);
791 	gtm_put_timer16(fhci->timer);
792 	cpm_muram_free(cpm_muram_offset(fhci->pram));
793 	for (i = 0; i < NUM_GPIOS; i++) {
794 		if (!gpio_is_valid(fhci->gpios[i]))
795 			continue;
796 		gpio_free(fhci->gpios[i]);
797 	}
798 	for (j = 0; j < NUM_PINS; j++)
799 		qe_pin_free(fhci->pins[j]);
800 	fhci_dfs_destroy(fhci);
801 	usb_put_hcd(hcd);
802 	return 0;
803 }
804 
805 static int of_fhci_remove(struct platform_device *ofdev)
806 {
807 	return fhci_remove(&ofdev->dev);
808 }
809 
810 static const struct of_device_id of_fhci_match[] = {
811 	{ .compatible = "fsl,mpc8323-qe-usb", },
812 	{},
813 };
814 MODULE_DEVICE_TABLE(of, of_fhci_match);
815 
816 static struct platform_driver of_fhci_driver = {
817 	.driver = {
818 		.name = "fsl,usb-fhci",
819 		.of_match_table = of_fhci_match,
820 	},
821 	.probe		= of_fhci_probe,
822 	.remove		= of_fhci_remove,
823 };
824 
825 module_platform_driver(of_fhci_driver);
826 
827 MODULE_DESCRIPTION("USB Freescale Host Controller Interface Driver");
828 MODULE_AUTHOR("Shlomi Gridish <gridish@freescale.com>, "
829 	      "Jerry Huang <Chang-Ming.Huang@freescale.com>, "
830 	      "Anton Vorontsov <avorontsov@ru.mvista.com>");
831 MODULE_LICENSE("GPL");
832