xref: /openbmc/linux/drivers/usb/host/fhci-hcd.c (revision baa7eb025ab14f3cba2e35c0a8648f9c9f01d24f) 
1 /*
2  * Freescale QUICC Engine USB Host Controller Driver
3  *
4  * Copyright (c) Freescale Semicondutor, Inc. 2006.
5  *               Shlomi Gridish <gridish@freescale.com>
6  *               Jerry Huang <Chang-Ming.Huang@freescale.com>
7  * Copyright (c) Logic Product Development, Inc. 2007
8  *               Peter Barada <peterb@logicpd.com>
9  * Copyright (c) MontaVista Software, Inc. 2008.
10  *               Anton Vorontsov <avorontsov@ru.mvista.com>
11  *
12  * This program is free software; you can redistribute  it and/or modify it
13  * under  the terms of  the GNU General  Public License as published by the
14  * Free Software Foundation;  either version 2 of the  License, or (at your
15  * option) any later version.
16  */
17 
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/spinlock.h>
21 #include <linux/kernel.h>
22 #include <linux/delay.h>
23 #include <linux/errno.h>
24 #include <linux/list.h>
25 #include <linux/interrupt.h>
26 #include <linux/io.h>
27 #include <linux/usb.h>
28 #include <linux/usb/hcd.h>
29 #include <linux/of_platform.h>
30 #include <linux/of_gpio.h>
31 #include <linux/slab.h>
32 #include <asm/qe.h>
33 #include <asm/fsl_gtm.h>
34 #include "fhci.h"
35 
36 void fhci_start_sof_timer(struct fhci_hcd *fhci)
37 {
38 	fhci_dbg(fhci, "-> %s\n", __func__);
39 
40 	/* clear frame_n */
41 	out_be16(&fhci->pram->frame_num, 0);
42 
43 	out_be16(&fhci->regs->usb_sof_tmr, 0);
44 	setbits8(&fhci->regs->usb_mod, USB_MODE_SFTE);
45 
46 	fhci_dbg(fhci, "<- %s\n", __func__);
47 }
48 
49 void fhci_stop_sof_timer(struct fhci_hcd *fhci)
50 {
51 	fhci_dbg(fhci, "-> %s\n", __func__);
52 
53 	clrbits8(&fhci->regs->usb_mod, USB_MODE_SFTE);
54 	gtm_stop_timer16(fhci->timer);
55 
56 	fhci_dbg(fhci, "<- %s\n", __func__);
57 }
58 
59 u16 fhci_get_sof_timer_count(struct fhci_usb *usb)
60 {
61 	return be16_to_cpu(in_be16(&usb->fhci->regs->usb_sof_tmr) / 12);
62 }
63 
64 /* initialize the endpoint zero */
65 static u32 endpoint_zero_init(struct fhci_usb *usb,
66 			      enum fhci_mem_alloc data_mem,
67 			      u32 ring_len)
68 {
69 	u32 rc;
70 
71 	rc = fhci_create_ep(usb, data_mem, ring_len);
72 	if (rc)
73 		return rc;
74 
75 	/* inilialize endpoint registers */
76 	fhci_init_ep_registers(usb, usb->ep0, data_mem);
77 
78 	return 0;
79 }
80 
81 /* enable the USB interrupts */
82 void fhci_usb_enable_interrupt(struct fhci_usb *usb)
83 {
84 	struct fhci_hcd *fhci = usb->fhci;
85 
86 	if (usb->intr_nesting_cnt == 1) {
87 		/* initialize the USB interrupt */
88 		enable_irq(fhci_to_hcd(fhci)->irq);
89 
90 		/* initialize the event register and mask register */
91 		out_be16(&usb->fhci->regs->usb_event, 0xffff);
92 		out_be16(&usb->fhci->regs->usb_mask, usb->saved_msk);
93 
94 		/* enable the timer interrupts */
95 		enable_irq(fhci->timer->irq);
96 	} else if (usb->intr_nesting_cnt > 1)
97 		fhci_info(fhci, "unbalanced USB interrupts nesting\n");
98 	usb->intr_nesting_cnt--;
99 }
100 
101 /* diable the usb interrupt */
102 void fhci_usb_disable_interrupt(struct fhci_usb *usb)
103 {
104 	struct fhci_hcd *fhci = usb->fhci;
105 
106 	if (usb->intr_nesting_cnt == 0) {
107 		/* diable the timer interrupt */
108 		disable_irq_nosync(fhci->timer->irq);
109 
110 		/* disable the usb interrupt */
111 		disable_irq_nosync(fhci_to_hcd(fhci)->irq);
112 		out_be16(&usb->fhci->regs->usb_mask, 0);
113 	}
114 	usb->intr_nesting_cnt++;
115 }
116 
117 /* enable the USB controller */
118 static u32 fhci_usb_enable(struct fhci_hcd *fhci)
119 {
120 	struct fhci_usb *usb = fhci->usb_lld;
121 
122 	out_be16(&usb->fhci->regs->usb_event, 0xffff);
123 	out_be16(&usb->fhci->regs->usb_mask, usb->saved_msk);
124 	setbits8(&usb->fhci->regs->usb_mod, USB_MODE_EN);
125 
126 	mdelay(100);
127 
128 	return 0;
129 }
130 
131 /* disable the USB controller */
132 static u32 fhci_usb_disable(struct fhci_hcd *fhci)
133 {
134 	struct fhci_usb *usb = fhci->usb_lld;
135 
136 	fhci_usb_disable_interrupt(usb);
137 	fhci_port_disable(fhci);
138 
139 	/* disable the usb controller */
140 	if (usb->port_status == FHCI_PORT_FULL ||
141 			usb->port_status == FHCI_PORT_LOW)
142 		fhci_device_disconnected_interrupt(fhci);
143 
144 	clrbits8(&usb->fhci->regs->usb_mod, USB_MODE_EN);
145 
146 	return 0;
147 }
148 
149 /* check the bus state by polling the QE bit on the IO ports */
150 int fhci_ioports_check_bus_state(struct fhci_hcd *fhci)
151 {
152 	u8 bits = 0;
153 
154 	/* check USBOE,if transmitting,exit */
155 	if (!gpio_get_value(fhci->gpios[GPIO_USBOE]))
156 		return -1;
157 
158 	/* check USBRP */
159 	if (gpio_get_value(fhci->gpios[GPIO_USBRP]))
160 		bits |= 0x2;
161 
162 	/* check USBRN */
163 	if (gpio_get_value(fhci->gpios[GPIO_USBRN]))
164 		bits |= 0x1;
165 
166 	return bits;
167 }
168 
169 static void fhci_mem_free(struct fhci_hcd *fhci)
170 {
171 	struct ed *ed;
172 	struct ed *next_ed;
173 	struct td *td;
174 	struct td *next_td;
175 
176 	list_for_each_entry_safe(ed, next_ed, &fhci->empty_eds, node) {
177 		list_del(&ed->node);
178 		kfree(ed);
179 	}
180 
181 	list_for_each_entry_safe(td, next_td, &fhci->empty_tds, node) {
182 		list_del(&td->node);
183 		kfree(td);
184 	}
185 
186 	kfree(fhci->vroot_hub);
187 	fhci->vroot_hub = NULL;
188 
189 	kfree(fhci->hc_list);
190 	fhci->hc_list = NULL;
191 }
192 
193 static int fhci_mem_init(struct fhci_hcd *fhci)
194 {
195 	int i;
196 
197 	fhci->hc_list = kzalloc(sizeof(*fhci->hc_list), GFP_KERNEL);
198 	if (!fhci->hc_list)
199 		goto err;
200 
201 	INIT_LIST_HEAD(&fhci->hc_list->ctrl_list);
202 	INIT_LIST_HEAD(&fhci->hc_list->bulk_list);
203 	INIT_LIST_HEAD(&fhci->hc_list->iso_list);
204 	INIT_LIST_HEAD(&fhci->hc_list->intr_list);
205 	INIT_LIST_HEAD(&fhci->hc_list->done_list);
206 
207 	fhci->vroot_hub = kzalloc(sizeof(*fhci->vroot_hub), GFP_KERNEL);
208 	if (!fhci->vroot_hub)
209 		goto err;
210 
211 	INIT_LIST_HEAD(&fhci->empty_eds);
212 	INIT_LIST_HEAD(&fhci->empty_tds);
213 
214 	/* initialize work queue to handle done list */
215 	fhci_tasklet.data = (unsigned long)fhci;
216 	fhci->process_done_task = &fhci_tasklet;
217 
218 	for (i = 0; i < MAX_TDS; i++) {
219 		struct td *td;
220 
221 		td = kmalloc(sizeof(*td), GFP_KERNEL);
222 		if (!td)
223 			goto err;
224 		fhci_recycle_empty_td(fhci, td);
225 	}
226 	for (i = 0; i < MAX_EDS; i++) {
227 		struct ed *ed;
228 
229 		ed = kmalloc(sizeof(*ed), GFP_KERNEL);
230 		if (!ed)
231 			goto err;
232 		fhci_recycle_empty_ed(fhci, ed);
233 	}
234 
235 	fhci->active_urbs = 0;
236 	return 0;
237 err:
238 	fhci_mem_free(fhci);
239 	return -ENOMEM;
240 }
241 
242 /* destroy the fhci_usb structure */
243 static void fhci_usb_free(void *lld)
244 {
245 	struct fhci_usb *usb = lld;
246 	struct fhci_hcd *fhci;
247 
248 	if (usb) {
249 		fhci = usb->fhci;
250 		fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
251 		fhci_ep0_free(usb);
252 		kfree(usb->actual_frame);
253 		kfree(usb);
254 	}
255 }
256 
257 /* initialize the USB */
258 static int fhci_usb_init(struct fhci_hcd *fhci)
259 {
260 	struct fhci_usb *usb = fhci->usb_lld;
261 
262 	memset_io(usb->fhci->pram, 0, FHCI_PRAM_SIZE);
263 
264 	usb->port_status = FHCI_PORT_DISABLED;
265 	usb->max_frame_usage = FRAME_TIME_USAGE;
266 	usb->sw_transaction_time = SW_FIX_TIME_BETWEEN_TRANSACTION;
267 
268 	usb->actual_frame = kzalloc(sizeof(*usb->actual_frame), GFP_KERNEL);
269 	if (!usb->actual_frame) {
270 		fhci_usb_free(usb);
271 		return -ENOMEM;
272 	}
273 
274 	INIT_LIST_HEAD(&usb->actual_frame->tds_list);
275 
276 	/* initializing registers on chip, clear frame number */
277 	out_be16(&fhci->pram->frame_num, 0);
278 
279 	/* clear rx state */
280 	out_be32(&fhci->pram->rx_state, 0);
281 
282 	/* set mask register */
283 	usb->saved_msk = (USB_E_TXB_MASK |
284 			  USB_E_TXE1_MASK |
285 			  USB_E_IDLE_MASK |
286 			  USB_E_RESET_MASK | USB_E_SFT_MASK | USB_E_MSF_MASK);
287 
288 	out_8(&usb->fhci->regs->usb_mod, USB_MODE_HOST | USB_MODE_EN);
289 
290 	/* clearing the mask register */
291 	out_be16(&usb->fhci->regs->usb_mask, 0);
292 
293 	/* initialing the event register */
294 	out_be16(&usb->fhci->regs->usb_event, 0xffff);
295 
296 	if (endpoint_zero_init(usb, DEFAULT_DATA_MEM, DEFAULT_RING_LEN) != 0) {
297 		fhci_usb_free(usb);
298 		return -EINVAL;
299 	}
300 
301 	return 0;
302 }
303 
304 /* initialize the fhci_usb struct and the corresponding data staruct */
305 static struct fhci_usb *fhci_create_lld(struct fhci_hcd *fhci)
306 {
307 	struct fhci_usb *usb;
308 
309 	/* allocate memory for SCC data structure */
310 	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
311 	if (!usb) {
312 		fhci_err(fhci, "no memory for SCC data struct\n");
313 		return NULL;
314 	}
315 
316 	usb->fhci = fhci;
317 	usb->hc_list = fhci->hc_list;
318 	usb->vroot_hub = fhci->vroot_hub;
319 
320 	usb->transfer_confirm = fhci_transfer_confirm_callback;
321 
322 	return usb;
323 }
324 
325 static int fhci_start(struct usb_hcd *hcd)
326 {
327 	int ret;
328 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
329 
330 	ret = fhci_mem_init(fhci);
331 	if (ret) {
332 		fhci_err(fhci, "failed to allocate memory\n");
333 		goto err;
334 	}
335 
336 	fhci->usb_lld = fhci_create_lld(fhci);
337 	if (!fhci->usb_lld) {
338 		fhci_err(fhci, "low level driver config failed\n");
339 		ret = -ENOMEM;
340 		goto err;
341 	}
342 
343 	ret = fhci_usb_init(fhci);
344 	if (ret) {
345 		fhci_err(fhci, "low level driver initialize failed\n");
346 		goto err;
347 	}
348 
349 	spin_lock_init(&fhci->lock);
350 
351 	/* connect the virtual root hub */
352 	fhci->vroot_hub->dev_num = 1;	/* this field may be needed to fix */
353 	fhci->vroot_hub->hub.wHubStatus = 0;
354 	fhci->vroot_hub->hub.wHubChange = 0;
355 	fhci->vroot_hub->port.wPortStatus = 0;
356 	fhci->vroot_hub->port.wPortChange = 0;
357 
358 	hcd->state = HC_STATE_RUNNING;
359 
360 	/*
361 	 * From here on, khubd concurrently accesses the root
362 	 * hub; drivers will be talking to enumerated devices.
363 	 * (On restart paths, khubd already knows about the root
364 	 * hub and could find work as soon as we wrote FLAG_CF.)
365 	 *
366 	 * Before this point the HC was idle/ready.  After, khubd
367 	 * and device drivers may start it running.
368 	 */
369 	fhci_usb_enable(fhci);
370 	return 0;
371 err:
372 	fhci_mem_free(fhci);
373 	return ret;
374 }
375 
376 static void fhci_stop(struct usb_hcd *hcd)
377 {
378 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
379 
380 	fhci_usb_disable_interrupt(fhci->usb_lld);
381 	fhci_usb_disable(fhci);
382 
383 	fhci_usb_free(fhci->usb_lld);
384 	fhci->usb_lld = NULL;
385 	fhci_mem_free(fhci);
386 }
387 
388 static int fhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
389 			    gfp_t mem_flags)
390 {
391 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
392 	u32 pipe = urb->pipe;
393 	int ret;
394 	int i;
395 	int size = 0;
396 	struct urb_priv *urb_priv;
397 	unsigned long flags;
398 
399 	switch (usb_pipetype(pipe)) {
400 	case PIPE_CONTROL:
401 		/* 1 td fro setup,1 for ack */
402 		size = 2;
403 	case PIPE_BULK:
404 		/* one td for every 4096 bytes(can be upto 8k) */
405 		size += urb->transfer_buffer_length / 4096;
406 		/* ...add for any remaining bytes... */
407 		if ((urb->transfer_buffer_length % 4096) != 0)
408 			size++;
409 		/* ..and maybe a zero length packet to wrap it up */
410 		if (size == 0)
411 			size++;
412 		else if ((urb->transfer_flags & URB_ZERO_PACKET) != 0
413 			 && (urb->transfer_buffer_length
414 			     % usb_maxpacket(urb->dev, pipe,
415 					     usb_pipeout(pipe))) != 0)
416 			size++;
417 		break;
418 	case PIPE_ISOCHRONOUS:
419 		size = urb->number_of_packets;
420 		if (size <= 0)
421 			return -EINVAL;
422 		for (i = 0; i < urb->number_of_packets; i++) {
423 			urb->iso_frame_desc[i].actual_length = 0;
424 			urb->iso_frame_desc[i].status = (u32) (-EXDEV);
425 		}
426 		break;
427 	case PIPE_INTERRUPT:
428 		size = 1;
429 	}
430 
431 	/* allocate the private part of the URB */
432 	urb_priv = kzalloc(sizeof(*urb_priv), mem_flags);
433 	if (!urb_priv)
434 		return -ENOMEM;
435 
436 	/* allocate the private part of the URB */
437 	urb_priv->tds = kcalloc(size, sizeof(*urb_priv->tds), mem_flags);
438 	if (!urb_priv->tds) {
439 		kfree(urb_priv);
440 		return -ENOMEM;
441 	}
442 
443 	spin_lock_irqsave(&fhci->lock, flags);
444 
445 	ret = usb_hcd_link_urb_to_ep(hcd, urb);
446 	if (ret)
447 		goto err;
448 
449 	/* fill the private part of the URB */
450 	urb_priv->num_of_tds = size;
451 
452 	urb->status = -EINPROGRESS;
453 	urb->actual_length = 0;
454 	urb->error_count = 0;
455 	urb->hcpriv = urb_priv;
456 
457 	fhci_queue_urb(fhci, urb);
458 err:
459 	if (ret) {
460 		kfree(urb_priv->tds);
461 		kfree(urb_priv);
462 	}
463 	spin_unlock_irqrestore(&fhci->lock, flags);
464 	return ret;
465 }
466 
467 /* dequeue FHCI URB */
468 static int fhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
469 {
470 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
471 	struct fhci_usb *usb = fhci->usb_lld;
472 	int ret = -EINVAL;
473 	unsigned long flags;
474 
475 	if (!urb || !urb->dev || !urb->dev->bus)
476 		goto out;
477 
478 	spin_lock_irqsave(&fhci->lock, flags);
479 
480 	ret = usb_hcd_check_unlink_urb(hcd, urb, status);
481 	if (ret)
482 		goto out2;
483 
484 	if (usb->port_status != FHCI_PORT_DISABLED) {
485 		struct urb_priv *urb_priv;
486 
487 		/*
488 		 * flag the urb's data for deletion in some upcoming
489 		 * SF interrupt's delete list processing
490 		 */
491 		urb_priv = urb->hcpriv;
492 
493 		if (!urb_priv || (urb_priv->state == URB_DEL))
494 			goto out2;
495 
496 		urb_priv->state = URB_DEL;
497 
498 		/* already pending? */
499 		urb_priv->ed->state = FHCI_ED_URB_DEL;
500 	} else {
501 		fhci_urb_complete_free(fhci, urb);
502 	}
503 
504 out2:
505 	spin_unlock_irqrestore(&fhci->lock, flags);
506 out:
507 	return ret;
508 }
509 
510 static void fhci_endpoint_disable(struct usb_hcd *hcd,
511 				  struct usb_host_endpoint *ep)
512 {
513 	struct fhci_hcd *fhci;
514 	struct ed *ed;
515 	unsigned long flags;
516 
517 	fhci = hcd_to_fhci(hcd);
518 	spin_lock_irqsave(&fhci->lock, flags);
519 	ed = ep->hcpriv;
520 	if (ed) {
521 		while (ed->td_head != NULL) {
522 			struct td *td = fhci_remove_td_from_ed(ed);
523 			fhci_urb_complete_free(fhci, td->urb);
524 		}
525 		fhci_recycle_empty_ed(fhci, ed);
526 		ep->hcpriv = NULL;
527 	}
528 	spin_unlock_irqrestore(&fhci->lock, flags);
529 }
530 
531 static int fhci_get_frame_number(struct usb_hcd *hcd)
532 {
533 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
534 
535 	return get_frame_num(fhci);
536 }
537 
538 static const struct hc_driver fhci_driver = {
539 	.description = "fsl,usb-fhci",
540 	.product_desc = "FHCI HOST Controller",
541 	.hcd_priv_size = sizeof(struct fhci_hcd),
542 
543 	/* generic hardware linkage */
544 	.irq = fhci_irq,
545 	.flags = HCD_USB11 | HCD_MEMORY,
546 
547 	/* basic lifecycle operation */
548 	.start = fhci_start,
549 	.stop = fhci_stop,
550 
551 	/* managing i/o requests and associated device resources */
552 	.urb_enqueue = fhci_urb_enqueue,
553 	.urb_dequeue = fhci_urb_dequeue,
554 	.endpoint_disable = fhci_endpoint_disable,
555 
556 	/* scheduling support */
557 	.get_frame_number = fhci_get_frame_number,
558 
559 	/* root hub support */
560 	.hub_status_data = fhci_hub_status_data,
561 	.hub_control = fhci_hub_control,
562 };
563 
564 static int __devinit of_fhci_probe(struct platform_device *ofdev,
565 				   const struct of_device_id *ofid)
566 {
567 	struct device *dev = &ofdev->dev;
568 	struct device_node *node = dev->of_node;
569 	struct usb_hcd *hcd;
570 	struct fhci_hcd *fhci;
571 	struct resource usb_regs;
572 	unsigned long pram_addr;
573 	unsigned int usb_irq;
574 	const char *sprop;
575 	const u32 *iprop;
576 	int size;
577 	int ret;
578 	int i;
579 	int j;
580 
581 	if (usb_disabled())
582 		return -ENODEV;
583 
584 	sprop = of_get_property(node, "mode", NULL);
585 	if (sprop && strcmp(sprop, "host"))
586 		return -ENODEV;
587 
588 	hcd = usb_create_hcd(&fhci_driver, dev, dev_name(dev));
589 	if (!hcd) {
590 		dev_err(dev, "could not create hcd\n");
591 		return -ENOMEM;
592 	}
593 
594 	fhci = hcd_to_fhci(hcd);
595 	hcd->self.controller = dev;
596 	dev_set_drvdata(dev, hcd);
597 
598 	iprop = of_get_property(node, "hub-power-budget", &size);
599 	if (iprop && size == sizeof(*iprop))
600 		hcd->power_budget = *iprop;
601 
602 	/* FHCI registers. */
603 	ret = of_address_to_resource(node, 0, &usb_regs);
604 	if (ret) {
605 		dev_err(dev, "could not get regs\n");
606 		goto err_regs;
607 	}
608 
609 	hcd->regs = ioremap(usb_regs.start, usb_regs.end - usb_regs.start + 1);
610 	if (!hcd->regs) {
611 		dev_err(dev, "could not ioremap regs\n");
612 		ret = -ENOMEM;
613 		goto err_regs;
614 	}
615 	fhci->regs = hcd->regs;
616 
617 	/* Parameter RAM. */
618 	iprop = of_get_property(node, "reg", &size);
619 	if (!iprop || size < sizeof(*iprop) * 4) {
620 		dev_err(dev, "can't get pram offset\n");
621 		ret = -EINVAL;
622 		goto err_pram;
623 	}
624 
625 	pram_addr = cpm_muram_alloc_fixed(iprop[2], FHCI_PRAM_SIZE);
626 	if (IS_ERR_VALUE(pram_addr)) {
627 		dev_err(dev, "failed to allocate usb pram\n");
628 		ret = -ENOMEM;
629 		goto err_pram;
630 	}
631 	fhci->pram = cpm_muram_addr(pram_addr);
632 
633 	/* GPIOs and pins */
634 	for (i = 0; i < NUM_GPIOS; i++) {
635 		int gpio;
636 		enum of_gpio_flags flags;
637 
638 		gpio = of_get_gpio_flags(node, i, &flags);
639 		fhci->gpios[i] = gpio;
640 		fhci->alow_gpios[i] = flags & OF_GPIO_ACTIVE_LOW;
641 
642 		if (!gpio_is_valid(gpio)) {
643 			if (i < GPIO_SPEED) {
644 				dev_err(dev, "incorrect GPIO%d: %d\n",
645 					i, gpio);
646 				goto err_gpios;
647 			} else {
648 				dev_info(dev, "assuming board doesn't have "
649 					"%s gpio\n", i == GPIO_SPEED ?
650 					"speed" : "power");
651 				continue;
652 			}
653 		}
654 
655 		ret = gpio_request(gpio, dev_name(dev));
656 		if (ret) {
657 			dev_err(dev, "failed to request gpio %d", i);
658 			goto err_gpios;
659 		}
660 
661 		if (i >= GPIO_SPEED) {
662 			ret = gpio_direction_output(gpio, 0);
663 			if (ret) {
664 				dev_err(dev, "failed to set gpio %d as "
665 					"an output\n", i);
666 				i++;
667 				goto err_gpios;
668 			}
669 		}
670 	}
671 
672 	for (j = 0; j < NUM_PINS; j++) {
673 		fhci->pins[j] = qe_pin_request(node, j);
674 		if (IS_ERR(fhci->pins[j])) {
675 			ret = PTR_ERR(fhci->pins[j]);
676 			dev_err(dev, "can't get pin %d: %d\n", j, ret);
677 			goto err_pins;
678 		}
679 	}
680 
681 	/* Frame limit timer and its interrupt. */
682 	fhci->timer = gtm_get_timer16();
683 	if (IS_ERR(fhci->timer)) {
684 		ret = PTR_ERR(fhci->timer);
685 		dev_err(dev, "failed to request qe timer: %i", ret);
686 		goto err_get_timer;
687 	}
688 
689 	ret = request_irq(fhci->timer->irq, fhci_frame_limit_timer_irq,
690 			  IRQF_DISABLED, "qe timer (usb)", hcd);
691 	if (ret) {
692 		dev_err(dev, "failed to request timer irq");
693 		goto err_timer_irq;
694 	}
695 
696 	/* USB Host interrupt. */
697 	usb_irq = irq_of_parse_and_map(node, 0);
698 	if (usb_irq == NO_IRQ) {
699 		dev_err(dev, "could not get usb irq\n");
700 		ret = -EINVAL;
701 		goto err_usb_irq;
702 	}
703 
704 	/* Clocks. */
705 	sprop = of_get_property(node, "fsl,fullspeed-clock", NULL);
706 	if (sprop) {
707 		fhci->fullspeed_clk = qe_clock_source(sprop);
708 		if (fhci->fullspeed_clk == QE_CLK_DUMMY) {
709 			dev_err(dev, "wrong fullspeed-clock\n");
710 			ret = -EINVAL;
711 			goto err_clocks;
712 		}
713 	}
714 
715 	sprop = of_get_property(node, "fsl,lowspeed-clock", NULL);
716 	if (sprop) {
717 		fhci->lowspeed_clk = qe_clock_source(sprop);
718 		if (fhci->lowspeed_clk == QE_CLK_DUMMY) {
719 			dev_err(dev, "wrong lowspeed-clock\n");
720 			ret = -EINVAL;
721 			goto err_clocks;
722 		}
723 	}
724 
725 	if (fhci->fullspeed_clk == QE_CLK_NONE &&
726 			fhci->lowspeed_clk == QE_CLK_NONE) {
727 		dev_err(dev, "no clocks specified\n");
728 		ret = -EINVAL;
729 		goto err_clocks;
730 	}
731 
732 	dev_info(dev, "at 0x%p, irq %d\n", hcd->regs, usb_irq);
733 
734 	fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
735 
736 	/* Start with full-speed, if possible. */
737 	if (fhci->fullspeed_clk != QE_CLK_NONE) {
738 		fhci_config_transceiver(fhci, FHCI_PORT_FULL);
739 		qe_usb_clock_set(fhci->fullspeed_clk, USB_CLOCK);
740 	} else {
741 		fhci_config_transceiver(fhci, FHCI_PORT_LOW);
742 		qe_usb_clock_set(fhci->lowspeed_clk, USB_CLOCK >> 3);
743 	}
744 
745 	/* Clear and disable any pending interrupts. */
746 	out_be16(&fhci->regs->usb_event, 0xffff);
747 	out_be16(&fhci->regs->usb_mask, 0);
748 
749 	ret = usb_add_hcd(hcd, usb_irq, IRQF_DISABLED);
750 	if (ret < 0)
751 		goto err_add_hcd;
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 __devexit 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 __devexit 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 of_platform_driver of_fhci_driver = {
816 	.driver = {
817 		.name = "fsl,usb-fhci",
818 		.owner = THIS_MODULE,
819 		.of_match_table = of_fhci_match,
820 	},
821 	.probe		= of_fhci_probe,
822 	.remove		= __devexit_p(of_fhci_remove),
823 };
824 
825 static int __init fhci_module_init(void)
826 {
827 	return of_register_platform_driver(&of_fhci_driver);
828 }
829 module_init(fhci_module_init);
830 
831 static void __exit fhci_module_exit(void)
832 {
833 	of_unregister_platform_driver(&of_fhci_driver);
834 }
835 module_exit(fhci_module_exit);
836 
837 MODULE_DESCRIPTION("USB Freescale Host Controller Interface Driver");
838 MODULE_AUTHOR("Shlomi Gridish <gridish@freescale.com>, "
839 	      "Jerry Huang <Chang-Ming.Huang@freescale.com>, "
840 	      "Anton Vorontsov <avorontsov@ru.mvista.com>");
841 MODULE_LICENSE("GPL");
842