xref: /linux/drivers/usb/host/fhci-hcd.c (revision f3a8b6645dc2e60d11f20c1c23afd964ff4e55ae) 
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_address.h>
30 #include <linux/of_irq.h>
31 #include <linux/of_platform.h>
32 #include <linux/of_gpio.h>
33 #include <linux/slab.h>
34 #include <soc/fsl/qe/qe.h>
35 #include <asm/fsl_gtm.h>
36 #include "fhci.h"
37 
38 void fhci_start_sof_timer(struct fhci_hcd *fhci)
39 {
40 	fhci_dbg(fhci, "-> %s\n", __func__);
41 
42 	/* clear frame_n */
43 	out_be16(&fhci->pram->frame_num, 0);
44 
45 	out_be16(&fhci->regs->usb_ussft, 0);
46 	setbits8(&fhci->regs->usb_usmod, USB_MODE_SFTE);
47 
48 	fhci_dbg(fhci, "<- %s\n", __func__);
49 }
50 
51 void fhci_stop_sof_timer(struct fhci_hcd *fhci)
52 {
53 	fhci_dbg(fhci, "-> %s\n", __func__);
54 
55 	clrbits8(&fhci->regs->usb_usmod, USB_MODE_SFTE);
56 	gtm_stop_timer16(fhci->timer);
57 
58 	fhci_dbg(fhci, "<- %s\n", __func__);
59 }
60 
61 u16 fhci_get_sof_timer_count(struct fhci_usb *usb)
62 {
63 	return be16_to_cpu(in_be16(&usb->fhci->regs->usb_ussft) / 12);
64 }
65 
66 /* initialize the endpoint zero */
67 static u32 endpoint_zero_init(struct fhci_usb *usb,
68 			      enum fhci_mem_alloc data_mem,
69 			      u32 ring_len)
70 {
71 	u32 rc;
72 
73 	rc = fhci_create_ep(usb, data_mem, ring_len);
74 	if (rc)
75 		return rc;
76 
77 	/* inilialize endpoint registers */
78 	fhci_init_ep_registers(usb, usb->ep0, data_mem);
79 
80 	return 0;
81 }
82 
83 /* enable the USB interrupts */
84 void fhci_usb_enable_interrupt(struct fhci_usb *usb)
85 {
86 	struct fhci_hcd *fhci = usb->fhci;
87 
88 	if (usb->intr_nesting_cnt == 1) {
89 		/* initialize the USB interrupt */
90 		enable_irq(fhci_to_hcd(fhci)->irq);
91 
92 		/* initialize the event register and mask register */
93 		out_be16(&usb->fhci->regs->usb_usber, 0xffff);
94 		out_be16(&usb->fhci->regs->usb_usbmr, usb->saved_msk);
95 
96 		/* enable the timer interrupts */
97 		enable_irq(fhci->timer->irq);
98 	} else if (usb->intr_nesting_cnt > 1)
99 		fhci_info(fhci, "unbalanced USB interrupts nesting\n");
100 	usb->intr_nesting_cnt--;
101 }
102 
103 /* disable the usb interrupt */
104 void fhci_usb_disable_interrupt(struct fhci_usb *usb)
105 {
106 	struct fhci_hcd *fhci = usb->fhci;
107 
108 	if (usb->intr_nesting_cnt == 0) {
109 		/* disable the timer interrupt */
110 		disable_irq_nosync(fhci->timer->irq);
111 
112 		/* disable the usb interrupt */
113 		disable_irq_nosync(fhci_to_hcd(fhci)->irq);
114 		out_be16(&usb->fhci->regs->usb_usbmr, 0);
115 	}
116 	usb->intr_nesting_cnt++;
117 }
118 
119 /* enable the USB controller */
120 static u32 fhci_usb_enable(struct fhci_hcd *fhci)
121 {
122 	struct fhci_usb *usb = fhci->usb_lld;
123 
124 	out_be16(&usb->fhci->regs->usb_usber, 0xffff);
125 	out_be16(&usb->fhci->regs->usb_usbmr, usb->saved_msk);
126 	setbits8(&usb->fhci->regs->usb_usmod, USB_MODE_EN);
127 
128 	mdelay(100);
129 
130 	return 0;
131 }
132 
133 /* disable the USB controller */
134 static u32 fhci_usb_disable(struct fhci_hcd *fhci)
135 {
136 	struct fhci_usb *usb = fhci->usb_lld;
137 
138 	fhci_usb_disable_interrupt(usb);
139 	fhci_port_disable(fhci);
140 
141 	/* disable the usb controller */
142 	if (usb->port_status == FHCI_PORT_FULL ||
143 			usb->port_status == FHCI_PORT_LOW)
144 		fhci_device_disconnected_interrupt(fhci);
145 
146 	clrbits8(&usb->fhci->regs->usb_usmod, USB_MODE_EN);
147 
148 	return 0;
149 }
150 
151 /* check the bus state by polling the QE bit on the IO ports */
152 int fhci_ioports_check_bus_state(struct fhci_hcd *fhci)
153 {
154 	u8 bits = 0;
155 
156 	/* check USBOE,if transmitting,exit */
157 	if (!gpio_get_value(fhci->gpios[GPIO_USBOE]))
158 		return -1;
159 
160 	/* check USBRP */
161 	if (gpio_get_value(fhci->gpios[GPIO_USBRP]))
162 		bits |= 0x2;
163 
164 	/* check USBRN */
165 	if (gpio_get_value(fhci->gpios[GPIO_USBRN]))
166 		bits |= 0x1;
167 
168 	return bits;
169 }
170 
171 static void fhci_mem_free(struct fhci_hcd *fhci)
172 {
173 	struct ed *ed;
174 	struct ed *next_ed;
175 	struct td *td;
176 	struct td *next_td;
177 
178 	list_for_each_entry_safe(ed, next_ed, &fhci->empty_eds, node) {
179 		list_del(&ed->node);
180 		kfree(ed);
181 	}
182 
183 	list_for_each_entry_safe(td, next_td, &fhci->empty_tds, node) {
184 		list_del(&td->node);
185 		kfree(td);
186 	}
187 
188 	kfree(fhci->vroot_hub);
189 	fhci->vroot_hub = NULL;
190 
191 	kfree(fhci->hc_list);
192 	fhci->hc_list = NULL;
193 }
194 
195 static int fhci_mem_init(struct fhci_hcd *fhci)
196 {
197 	int i;
198 
199 	fhci->hc_list = kzalloc(sizeof(*fhci->hc_list), GFP_KERNEL);
200 	if (!fhci->hc_list)
201 		goto err;
202 
203 	INIT_LIST_HEAD(&fhci->hc_list->ctrl_list);
204 	INIT_LIST_HEAD(&fhci->hc_list->bulk_list);
205 	INIT_LIST_HEAD(&fhci->hc_list->iso_list);
206 	INIT_LIST_HEAD(&fhci->hc_list->intr_list);
207 	INIT_LIST_HEAD(&fhci->hc_list->done_list);
208 
209 	fhci->vroot_hub = kzalloc(sizeof(*fhci->vroot_hub), GFP_KERNEL);
210 	if (!fhci->vroot_hub)
211 		goto err;
212 
213 	INIT_LIST_HEAD(&fhci->empty_eds);
214 	INIT_LIST_HEAD(&fhci->empty_tds);
215 
216 	/* initialize work queue to handle done list */
217 	fhci_tasklet.data = (unsigned long)fhci;
218 	fhci->process_done_task = &fhci_tasklet;
219 
220 	for (i = 0; i < MAX_TDS; i++) {
221 		struct td *td;
222 
223 		td = kmalloc(sizeof(*td), GFP_KERNEL);
224 		if (!td)
225 			goto err;
226 		fhci_recycle_empty_td(fhci, td);
227 	}
228 	for (i = 0; i < MAX_EDS; i++) {
229 		struct ed *ed;
230 
231 		ed = kmalloc(sizeof(*ed), GFP_KERNEL);
232 		if (!ed)
233 			goto err;
234 		fhci_recycle_empty_ed(fhci, ed);
235 	}
236 
237 	fhci->active_urbs = 0;
238 	return 0;
239 err:
240 	fhci_mem_free(fhci);
241 	return -ENOMEM;
242 }
243 
244 /* destroy the fhci_usb structure */
245 static void fhci_usb_free(void *lld)
246 {
247 	struct fhci_usb *usb = lld;
248 	struct fhci_hcd *fhci;
249 
250 	if (usb) {
251 		fhci = usb->fhci;
252 		fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
253 		fhci_ep0_free(usb);
254 		kfree(usb->actual_frame);
255 		kfree(usb);
256 	}
257 }
258 
259 /* initialize the USB */
260 static int fhci_usb_init(struct fhci_hcd *fhci)
261 {
262 	struct fhci_usb *usb = fhci->usb_lld;
263 
264 	memset_io(usb->fhci->pram, 0, FHCI_PRAM_SIZE);
265 
266 	usb->port_status = FHCI_PORT_DISABLED;
267 	usb->max_frame_usage = FRAME_TIME_USAGE;
268 	usb->sw_transaction_time = SW_FIX_TIME_BETWEEN_TRANSACTION;
269 
270 	usb->actual_frame = kzalloc(sizeof(*usb->actual_frame), GFP_KERNEL);
271 	if (!usb->actual_frame) {
272 		fhci_usb_free(usb);
273 		return -ENOMEM;
274 	}
275 
276 	INIT_LIST_HEAD(&usb->actual_frame->tds_list);
277 
278 	/* initializing registers on chip, clear frame number */
279 	out_be16(&fhci->pram->frame_num, 0);
280 
281 	/* clear rx state */
282 	out_be32(&fhci->pram->rx_state, 0);
283 
284 	/* set mask register */
285 	usb->saved_msk = (USB_E_TXB_MASK |
286 			  USB_E_TXE1_MASK |
287 			  USB_E_IDLE_MASK |
288 			  USB_E_RESET_MASK | USB_E_SFT_MASK | USB_E_MSF_MASK);
289 
290 	out_8(&usb->fhci->regs->usb_usmod, USB_MODE_HOST | USB_MODE_EN);
291 
292 	/* clearing the mask register */
293 	out_be16(&usb->fhci->regs->usb_usbmr, 0);
294 
295 	/* initialing the event register */
296 	out_be16(&usb->fhci->regs->usb_usber, 0xffff);
297 
298 	if (endpoint_zero_init(usb, DEFAULT_DATA_MEM, DEFAULT_RING_LEN) != 0) {
299 		fhci_usb_free(usb);
300 		return -EINVAL;
301 	}
302 
303 	return 0;
304 }
305 
306 /* initialize the fhci_usb struct and the corresponding data staruct */
307 static struct fhci_usb *fhci_create_lld(struct fhci_hcd *fhci)
308 {
309 	struct fhci_usb *usb;
310 
311 	/* allocate memory for SCC data structure */
312 	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
313 	if (!usb)
314 		return NULL;
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, hub_wq concurrently accesses the root
362 	 * hub; drivers will be talking to enumerated devices.
363 	 * (On restart paths, hub_wq 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, hub_wq
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 up to 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 of_fhci_probe(struct platform_device *ofdev)
565 {
566 	struct device *dev = &ofdev->dev;
567 	struct device_node *node = dev->of_node;
568 	struct usb_hcd *hcd;
569 	struct fhci_hcd *fhci;
570 	struct resource usb_regs;
571 	unsigned long pram_addr;
572 	unsigned int usb_irq;
573 	const char *sprop;
574 	const u32 *iprop;
575 	int size;
576 	int ret;
577 	int i;
578 	int j;
579 
580 	if (usb_disabled())
581 		return -ENODEV;
582 
583 	sprop = of_get_property(node, "mode", NULL);
584 	if (sprop && strcmp(sprop, "host"))
585 		return -ENODEV;
586 
587 	hcd = usb_create_hcd(&fhci_driver, dev, dev_name(dev));
588 	if (!hcd) {
589 		dev_err(dev, "could not create hcd\n");
590 		return -ENOMEM;
591 	}
592 
593 	fhci = hcd_to_fhci(hcd);
594 	hcd->self.controller = dev;
595 	dev_set_drvdata(dev, hcd);
596 
597 	iprop = of_get_property(node, "hub-power-budget", &size);
598 	if (iprop && size == sizeof(*iprop))
599 		hcd->power_budget = *iprop;
600 
601 	/* FHCI registers. */
602 	ret = of_address_to_resource(node, 0, &usb_regs);
603 	if (ret) {
604 		dev_err(dev, "could not get regs\n");
605 		goto err_regs;
606 	}
607 
608 	hcd->regs = ioremap(usb_regs.start, resource_size(&usb_regs));
609 	if (!hcd->regs) {
610 		dev_err(dev, "could not ioremap regs\n");
611 		ret = -ENOMEM;
612 		goto err_regs;
613 	}
614 	fhci->regs = hcd->regs;
615 
616 	/* Parameter RAM. */
617 	iprop = of_get_property(node, "reg", &size);
618 	if (!iprop || size < sizeof(*iprop) * 4) {
619 		dev_err(dev, "can't get pram offset\n");
620 		ret = -EINVAL;
621 		goto err_pram;
622 	}
623 
624 	pram_addr = cpm_muram_alloc(FHCI_PRAM_SIZE, 64);
625 	if (IS_ERR_VALUE(pram_addr)) {
626 		dev_err(dev, "failed to allocate usb pram\n");
627 		ret = -ENOMEM;
628 		goto err_pram;
629 	}
630 
631 	qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, QE_CR_SUBBLOCK_USB,
632 		     QE_CR_PROTOCOL_UNSPECIFIED, pram_addr);
633 	fhci->pram = cpm_muram_addr(pram_addr);
634 
635 	/* GPIOs and pins */
636 	for (i = 0; i < NUM_GPIOS; i++) {
637 		int gpio;
638 		enum of_gpio_flags flags;
639 
640 		gpio = of_get_gpio_flags(node, i, &flags);
641 		fhci->gpios[i] = gpio;
642 		fhci->alow_gpios[i] = flags & OF_GPIO_ACTIVE_LOW;
643 
644 		if (!gpio_is_valid(gpio)) {
645 			if (i < GPIO_SPEED) {
646 				dev_err(dev, "incorrect GPIO%d: %d\n",
647 					i, gpio);
648 				goto err_gpios;
649 			} else {
650 				dev_info(dev, "assuming board doesn't have "
651 					"%s gpio\n", i == GPIO_SPEED ?
652 					"speed" : "power");
653 				continue;
654 			}
655 		}
656 
657 		ret = gpio_request(gpio, dev_name(dev));
658 		if (ret) {
659 			dev_err(dev, "failed to request gpio %d", i);
660 			goto err_gpios;
661 		}
662 
663 		if (i >= GPIO_SPEED) {
664 			ret = gpio_direction_output(gpio, 0);
665 			if (ret) {
666 				dev_err(dev, "failed to set gpio %d as "
667 					"an output\n", i);
668 				i++;
669 				goto err_gpios;
670 			}
671 		}
672 	}
673 
674 	for (j = 0; j < NUM_PINS; j++) {
675 		fhci->pins[j] = qe_pin_request(node, j);
676 		if (IS_ERR(fhci->pins[j])) {
677 			ret = PTR_ERR(fhci->pins[j]);
678 			dev_err(dev, "can't get pin %d: %d\n", j, ret);
679 			goto err_pins;
680 		}
681 	}
682 
683 	/* Frame limit timer and its interrupt. */
684 	fhci->timer = gtm_get_timer16();
685 	if (IS_ERR(fhci->timer)) {
686 		ret = PTR_ERR(fhci->timer);
687 		dev_err(dev, "failed to request qe timer: %i", ret);
688 		goto err_get_timer;
689 	}
690 
691 	ret = request_irq(fhci->timer->irq, fhci_frame_limit_timer_irq,
692 			  0, "qe timer (usb)", hcd);
693 	if (ret) {
694 		dev_err(dev, "failed to request timer irq");
695 		goto err_timer_irq;
696 	}
697 
698 	/* USB Host interrupt. */
699 	usb_irq = irq_of_parse_and_map(node, 0);
700 	if (usb_irq == NO_IRQ) {
701 		dev_err(dev, "could not get usb irq\n");
702 		ret = -EINVAL;
703 		goto err_usb_irq;
704 	}
705 
706 	/* Clocks. */
707 	sprop = of_get_property(node, "fsl,fullspeed-clock", NULL);
708 	if (sprop) {
709 		fhci->fullspeed_clk = qe_clock_source(sprop);
710 		if (fhci->fullspeed_clk == QE_CLK_DUMMY) {
711 			dev_err(dev, "wrong fullspeed-clock\n");
712 			ret = -EINVAL;
713 			goto err_clocks;
714 		}
715 	}
716 
717 	sprop = of_get_property(node, "fsl,lowspeed-clock", NULL);
718 	if (sprop) {
719 		fhci->lowspeed_clk = qe_clock_source(sprop);
720 		if (fhci->lowspeed_clk == QE_CLK_DUMMY) {
721 			dev_err(dev, "wrong lowspeed-clock\n");
722 			ret = -EINVAL;
723 			goto err_clocks;
724 		}
725 	}
726 
727 	if (fhci->fullspeed_clk == QE_CLK_NONE &&
728 			fhci->lowspeed_clk == QE_CLK_NONE) {
729 		dev_err(dev, "no clocks specified\n");
730 		ret = -EINVAL;
731 		goto err_clocks;
732 	}
733 
734 	dev_info(dev, "at 0x%p, irq %d\n", hcd->regs, usb_irq);
735 
736 	fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
737 
738 	/* Start with full-speed, if possible. */
739 	if (fhci->fullspeed_clk != QE_CLK_NONE) {
740 		fhci_config_transceiver(fhci, FHCI_PORT_FULL);
741 		qe_usb_clock_set(fhci->fullspeed_clk, USB_CLOCK);
742 	} else {
743 		fhci_config_transceiver(fhci, FHCI_PORT_LOW);
744 		qe_usb_clock_set(fhci->lowspeed_clk, USB_CLOCK >> 3);
745 	}
746 
747 	/* Clear and disable any pending interrupts. */
748 	out_be16(&fhci->regs->usb_usber, 0xffff);
749 	out_be16(&fhci->regs->usb_usbmr, 0);
750 
751 	ret = usb_add_hcd(hcd, usb_irq, 0);
752 	if (ret < 0)
753 		goto err_add_hcd;
754 
755 	device_wakeup_enable(hcd->self.controller);
756 
757 	fhci_dfs_create(fhci);
758 
759 	return 0;
760 
761 err_add_hcd:
762 err_clocks:
763 	irq_dispose_mapping(usb_irq);
764 err_usb_irq:
765 	free_irq(fhci->timer->irq, hcd);
766 err_timer_irq:
767 	gtm_put_timer16(fhci->timer);
768 err_get_timer:
769 err_pins:
770 	while (--j >= 0)
771 		qe_pin_free(fhci->pins[j]);
772 err_gpios:
773 	while (--i >= 0) {
774 		if (gpio_is_valid(fhci->gpios[i]))
775 			gpio_free(fhci->gpios[i]);
776 	}
777 	cpm_muram_free(pram_addr);
778 err_pram:
779 	iounmap(hcd->regs);
780 err_regs:
781 	usb_put_hcd(hcd);
782 	return ret;
783 }
784 
785 static int fhci_remove(struct device *dev)
786 {
787 	struct usb_hcd *hcd = dev_get_drvdata(dev);
788 	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
789 	int i;
790 	int j;
791 
792 	usb_remove_hcd(hcd);
793 	free_irq(fhci->timer->irq, hcd);
794 	gtm_put_timer16(fhci->timer);
795 	cpm_muram_free(cpm_muram_offset(fhci->pram));
796 	for (i = 0; i < NUM_GPIOS; i++) {
797 		if (!gpio_is_valid(fhci->gpios[i]))
798 			continue;
799 		gpio_free(fhci->gpios[i]);
800 	}
801 	for (j = 0; j < NUM_PINS; j++)
802 		qe_pin_free(fhci->pins[j]);
803 	fhci_dfs_destroy(fhci);
804 	usb_put_hcd(hcd);
805 	return 0;
806 }
807 
808 static int of_fhci_remove(struct platform_device *ofdev)
809 {
810 	return fhci_remove(&ofdev->dev);
811 }
812 
813 static const struct of_device_id of_fhci_match[] = {
814 	{ .compatible = "fsl,mpc8323-qe-usb", },
815 	{},
816 };
817 MODULE_DEVICE_TABLE(of, of_fhci_match);
818 
819 static struct platform_driver of_fhci_driver = {
820 	.driver = {
821 		.name = "fsl,usb-fhci",
822 		.of_match_table = of_fhci_match,
823 	},
824 	.probe		= of_fhci_probe,
825 	.remove		= of_fhci_remove,
826 };
827 
828 module_platform_driver(of_fhci_driver);
829 
830 MODULE_DESCRIPTION("USB Freescale Host Controller Interface Driver");
831 MODULE_AUTHOR("Shlomi Gridish <gridish@freescale.com>, "
832 	      "Jerry Huang <Chang-Ming.Huang@freescale.com>, "
833 	      "Anton Vorontsov <avorontsov@ru.mvista.com>");
834 MODULE_LICENSE("GPL");
835