xref: /openbmc/linux/drivers/usb/host/fhci-hcd.c (revision d3741027) 
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)) != 0)
412 			size++;
413 		break;
414 	case PIPE_ISOCHRONOUS:
415 		size = urb->number_of_packets;
416 		if (size <= 0)
417 			return -EINVAL;
418 		for (i = 0; i < urb->number_of_packets; i++) {
419 			urb->iso_frame_desc[i].actual_length = 0;
420 			urb->iso_frame_desc[i].status = (u32) (-EXDEV);
421 		}
422 		break;
423 	case PIPE_INTERRUPT:
424 		size = 1;
425 	}
426 
427 	/* allocate the private part of the URB */
428 	urb_priv = kzalloc(sizeof(*urb_priv), mem_flags);
429 	if (!urb_priv)
430 		return -ENOMEM;
431 
432 	/* allocate the private part of the URB */
433 	urb_priv->tds = kcalloc(size, sizeof(*urb_priv->tds), mem_flags);
434 	if (!urb_priv->tds) {
435 		kfree(urb_priv);
436 		return -ENOMEM;
437 	}
438 
439 	spin_lock_irqsave(&fhci->lock, flags);
440 
441 	ret = usb_hcd_link_urb_to_ep(hcd, urb);
442 	if (ret)
443 		goto err;
444 
445 	/* fill the private part of the URB */
446 	urb_priv->num_of_tds = size;
447 
448 	urb->status = -EINPROGRESS;
449 	urb->actual_length = 0;
450 	urb->error_count = 0;
451 	urb->hcpriv = urb_priv;
452 
453 	fhci_queue_urb(fhci, urb);
454 err:
455 	if (ret) {
456 		kfree(urb_priv->tds);
457 		kfree(urb_priv);
458 	}
459 	spin_unlock_irqrestore(&fhci->lock, flags);
460 	return ret;
461 }
462 
463 /* dequeue FHCI URB */
464 static int fhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
465 {
466 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
467 	struct fhci_usb *usb = fhci->usb_lld;
468 	int ret = -EINVAL;
469 	unsigned long flags;
470 
471 	if (!urb || !urb->dev || !urb->dev->bus)
472 		goto out;
473 
474 	spin_lock_irqsave(&fhci->lock, flags);
475 
476 	ret = usb_hcd_check_unlink_urb(hcd, urb, status);
477 	if (ret)
478 		goto out2;
479 
480 	if (usb->port_status != FHCI_PORT_DISABLED) {
481 		struct urb_priv *urb_priv;
482 
483 		/*
484 		 * flag the urb's data for deletion in some upcoming
485 		 * SF interrupt's delete list processing
486 		 */
487 		urb_priv = urb->hcpriv;
488 
489 		if (!urb_priv || (urb_priv->state == URB_DEL))
490 			goto out2;
491 
492 		urb_priv->state = URB_DEL;
493 
494 		/* already pending? */
495 		urb_priv->ed->state = FHCI_ED_URB_DEL;
496 	} else {
497 		fhci_urb_complete_free(fhci, urb);
498 	}
499 
500 out2:
501 	spin_unlock_irqrestore(&fhci->lock, flags);
502 out:
503 	return ret;
504 }
505 
506 static void fhci_endpoint_disable(struct usb_hcd *hcd,
507 				  struct usb_host_endpoint *ep)
508 {
509 	struct fhci_hcd *fhci;
510 	struct ed *ed;
511 	unsigned long flags;
512 
513 	fhci = hcd_to_fhci(hcd);
514 	spin_lock_irqsave(&fhci->lock, flags);
515 	ed = ep->hcpriv;
516 	if (ed) {
517 		while (ed->td_head != NULL) {
518 			struct td *td = fhci_remove_td_from_ed(ed);
519 			fhci_urb_complete_free(fhci, td->urb);
520 		}
521 		fhci_recycle_empty_ed(fhci, ed);
522 		ep->hcpriv = NULL;
523 	}
524 	spin_unlock_irqrestore(&fhci->lock, flags);
525 }
526 
527 static int fhci_get_frame_number(struct usb_hcd *hcd)
528 {
529 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
530 
531 	return get_frame_num(fhci);
532 }
533 
534 static const struct hc_driver fhci_driver = {
535 	.description = "fsl,usb-fhci",
536 	.product_desc = "FHCI HOST Controller",
537 	.hcd_priv_size = sizeof(struct fhci_hcd),
538 
539 	/* generic hardware linkage */
540 	.irq = fhci_irq,
541 	.flags = HCD_DMA | HCD_USB11 | HCD_MEMORY,
542 
543 	/* basic lifecycle operation */
544 	.start = fhci_start,
545 	.stop = fhci_stop,
546 
547 	/* managing i/o requests and associated device resources */
548 	.urb_enqueue = fhci_urb_enqueue,
549 	.urb_dequeue = fhci_urb_dequeue,
550 	.endpoint_disable = fhci_endpoint_disable,
551 
552 	/* scheduling support */
553 	.get_frame_number = fhci_get_frame_number,
554 
555 	/* root hub support */
556 	.hub_status_data = fhci_hub_status_data,
557 	.hub_control = fhci_hub_control,
558 };
559 
560 static int of_fhci_probe(struct platform_device *ofdev)
561 {
562 	struct device *dev = &ofdev->dev;
563 	struct device_node *node = dev->of_node;
564 	struct usb_hcd *hcd;
565 	struct fhci_hcd *fhci;
566 	struct resource usb_regs;
567 	unsigned long pram_addr;
568 	unsigned int usb_irq;
569 	const char *sprop;
570 	const u32 *iprop;
571 	int size;
572 	int ret;
573 	int i;
574 	int j;
575 
576 	if (usb_disabled())
577 		return -ENODEV;
578 
579 	sprop = of_get_property(node, "mode", NULL);
580 	if (sprop && strcmp(sprop, "host"))
581 		return -ENODEV;
582 
583 	hcd = usb_create_hcd(&fhci_driver, dev, dev_name(dev));
584 	if (!hcd) {
585 		dev_err(dev, "could not create hcd\n");
586 		return -ENOMEM;
587 	}
588 
589 	fhci = hcd_to_fhci(hcd);
590 	hcd->self.controller = dev;
591 	dev_set_drvdata(dev, hcd);
592 
593 	iprop = of_get_property(node, "hub-power-budget", &size);
594 	if (iprop && size == sizeof(*iprop))
595 		hcd->power_budget = *iprop;
596 
597 	/* FHCI registers. */
598 	ret = of_address_to_resource(node, 0, &usb_regs);
599 	if (ret) {
600 		dev_err(dev, "could not get regs\n");
601 		goto err_regs;
602 	}
603 
604 	hcd->regs = ioremap(usb_regs.start, resource_size(&usb_regs));
605 	if (!hcd->regs) {
606 		dev_err(dev, "could not ioremap regs\n");
607 		ret = -ENOMEM;
608 		goto err_regs;
609 	}
610 	fhci->regs = hcd->regs;
611 
612 	/* Parameter RAM. */
613 	iprop = of_get_property(node, "reg", &size);
614 	if (!iprop || size < sizeof(*iprop) * 4) {
615 		dev_err(dev, "can't get pram offset\n");
616 		ret = -EINVAL;
617 		goto err_pram;
618 	}
619 
620 	pram_addr = cpm_muram_alloc(FHCI_PRAM_SIZE, 64);
621 	if (IS_ERR_VALUE(pram_addr)) {
622 		dev_err(dev, "failed to allocate usb pram\n");
623 		ret = -ENOMEM;
624 		goto err_pram;
625 	}
626 
627 	qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, QE_CR_SUBBLOCK_USB,
628 		     QE_CR_PROTOCOL_UNSPECIFIED, pram_addr);
629 	fhci->pram = cpm_muram_addr(pram_addr);
630 
631 	/* GPIOs and pins */
632 	for (i = 0; i < NUM_GPIOS; i++) {
633 		int gpio;
634 		enum of_gpio_flags flags;
635 
636 		gpio = of_get_gpio_flags(node, i, &flags);
637 		fhci->gpios[i] = gpio;
638 		fhci->alow_gpios[i] = flags & OF_GPIO_ACTIVE_LOW;
639 
640 		if (!gpio_is_valid(gpio)) {
641 			if (i < GPIO_SPEED) {
642 				dev_err(dev, "incorrect GPIO%d: %d\n",
643 					i, gpio);
644 				goto err_gpios;
645 			} else {
646 				dev_info(dev, "assuming board doesn't have "
647 					"%s gpio\n", i == GPIO_SPEED ?
648 					"speed" : "power");
649 				continue;
650 			}
651 		}
652 
653 		ret = gpio_request(gpio, dev_name(dev));
654 		if (ret) {
655 			dev_err(dev, "failed to request gpio %d", i);
656 			goto err_gpios;
657 		}
658 
659 		if (i >= GPIO_SPEED) {
660 			ret = gpio_direction_output(gpio, 0);
661 			if (ret) {
662 				dev_err(dev, "failed to set gpio %d as "
663 					"an output\n", i);
664 				i++;
665 				goto err_gpios;
666 			}
667 		}
668 	}
669 
670 	for (j = 0; j < NUM_PINS; j++) {
671 		fhci->pins[j] = qe_pin_request(node, j);
672 		if (IS_ERR(fhci->pins[j])) {
673 			ret = PTR_ERR(fhci->pins[j]);
674 			dev_err(dev, "can't get pin %d: %d\n", j, ret);
675 			goto err_pins;
676 		}
677 	}
678 
679 	/* Frame limit timer and its interrupt. */
680 	fhci->timer = gtm_get_timer16();
681 	if (IS_ERR(fhci->timer)) {
682 		ret = PTR_ERR(fhci->timer);
683 		dev_err(dev, "failed to request qe timer: %i", ret);
684 		goto err_get_timer;
685 	}
686 
687 	ret = request_irq(fhci->timer->irq, fhci_frame_limit_timer_irq,
688 			  0, "qe timer (usb)", hcd);
689 	if (ret) {
690 		dev_err(dev, "failed to request timer irq");
691 		goto err_timer_irq;
692 	}
693 
694 	/* USB Host interrupt. */
695 	usb_irq = irq_of_parse_and_map(node, 0);
696 	if (usb_irq == NO_IRQ) {
697 		dev_err(dev, "could not get usb irq\n");
698 		ret = -EINVAL;
699 		goto err_usb_irq;
700 	}
701 
702 	/* Clocks. */
703 	sprop = of_get_property(node, "fsl,fullspeed-clock", NULL);
704 	if (sprop) {
705 		fhci->fullspeed_clk = qe_clock_source(sprop);
706 		if (fhci->fullspeed_clk == QE_CLK_DUMMY) {
707 			dev_err(dev, "wrong fullspeed-clock\n");
708 			ret = -EINVAL;
709 			goto err_clocks;
710 		}
711 	}
712 
713 	sprop = of_get_property(node, "fsl,lowspeed-clock", NULL);
714 	if (sprop) {
715 		fhci->lowspeed_clk = qe_clock_source(sprop);
716 		if (fhci->lowspeed_clk == QE_CLK_DUMMY) {
717 			dev_err(dev, "wrong lowspeed-clock\n");
718 			ret = -EINVAL;
719 			goto err_clocks;
720 		}
721 	}
722 
723 	if (fhci->fullspeed_clk == QE_CLK_NONE &&
724 			fhci->lowspeed_clk == QE_CLK_NONE) {
725 		dev_err(dev, "no clocks specified\n");
726 		ret = -EINVAL;
727 		goto err_clocks;
728 	}
729 
730 	dev_info(dev, "at 0x%p, irq %d\n", hcd->regs, usb_irq);
731 
732 	fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
733 
734 	/* Start with full-speed, if possible. */
735 	if (fhci->fullspeed_clk != QE_CLK_NONE) {
736 		fhci_config_transceiver(fhci, FHCI_PORT_FULL);
737 		qe_usb_clock_set(fhci->fullspeed_clk, USB_CLOCK);
738 	} else {
739 		fhci_config_transceiver(fhci, FHCI_PORT_LOW);
740 		qe_usb_clock_set(fhci->lowspeed_clk, USB_CLOCK >> 3);
741 	}
742 
743 	/* Clear and disable any pending interrupts. */
744 	out_be16(&fhci->regs->usb_usber, 0xffff);
745 	out_be16(&fhci->regs->usb_usbmr, 0);
746 
747 	ret = usb_add_hcd(hcd, usb_irq, 0);
748 	if (ret < 0)
749 		goto err_add_hcd;
750 
751 	device_wakeup_enable(hcd->self.controller);
752 
753 	fhci_dfs_create(fhci);
754 
755 	return 0;
756 
757 err_add_hcd:
758 err_clocks:
759 	irq_dispose_mapping(usb_irq);
760 err_usb_irq:
761 	free_irq(fhci->timer->irq, hcd);
762 err_timer_irq:
763 	gtm_put_timer16(fhci->timer);
764 err_get_timer:
765 err_pins:
766 	while (--j >= 0)
767 		qe_pin_free(fhci->pins[j]);
768 err_gpios:
769 	while (--i >= 0) {
770 		if (gpio_is_valid(fhci->gpios[i]))
771 			gpio_free(fhci->gpios[i]);
772 	}
773 	cpm_muram_free(pram_addr);
774 err_pram:
775 	iounmap(hcd->regs);
776 err_regs:
777 	usb_put_hcd(hcd);
778 	return ret;
779 }
780 
781 static int fhci_remove(struct device *dev)
782 {
783 	struct usb_hcd *hcd = dev_get_drvdata(dev);
784 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
785 	int i;
786 	int j;
787 
788 	usb_remove_hcd(hcd);
789 	free_irq(fhci->timer->irq, hcd);
790 	gtm_put_timer16(fhci->timer);
791 	cpm_muram_free(cpm_muram_offset(fhci->pram));
792 	for (i = 0; i < NUM_GPIOS; i++) {
793 		if (!gpio_is_valid(fhci->gpios[i]))
794 			continue;
795 		gpio_free(fhci->gpios[i]);
796 	}
797 	for (j = 0; j < NUM_PINS; j++)
798 		qe_pin_free(fhci->pins[j]);
799 	fhci_dfs_destroy(fhci);
800 	usb_put_hcd(hcd);
801 	return 0;
802 }
803 
804 static int of_fhci_remove(struct platform_device *ofdev)
805 {
806 	return fhci_remove(&ofdev->dev);
807 }
808 
809 static const struct of_device_id of_fhci_match[] = {
810 	{ .compatible = "fsl,mpc8323-qe-usb", },
811 	{},
812 };
813 MODULE_DEVICE_TABLE(of, of_fhci_match);
814 
815 static struct platform_driver of_fhci_driver = {
816 	.driver = {
817 		.name = "fsl,usb-fhci",
818 		.of_match_table = of_fhci_match,
819 	},
820 	.probe		= of_fhci_probe,
821 	.remove		= of_fhci_remove,
822 };
823 
824 module_platform_driver(of_fhci_driver);
825 
826 MODULE_DESCRIPTION("USB Freescale Host Controller Interface Driver");
827 MODULE_AUTHOR("Shlomi Gridish <gridish@freescale.com>, "
828 	      "Jerry Huang <Chang-Ming.Huang@freescale.com>, "
829 	      "Anton Vorontsov <avorontsov@ru.mvista.com>");
830 MODULE_LICENSE("GPL");
831