1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * aspeed-vhub -- Driver for Aspeed SoC "vHub" USB gadget
4  *
5  * hub.c - virtual hub handling
6  *
7  * Copyright 2017 IBM Corporation
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  */
14 
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/delay.h>
19 #include <linux/ioport.h>
20 #include <linux/slab.h>
21 #include <linux/errno.h>
22 #include <linux/list.h>
23 #include <linux/interrupt.h>
24 #include <linux/proc_fs.h>
25 #include <linux/prefetch.h>
26 #include <linux/clk.h>
27 #include <linux/usb/gadget.h>
28 #include <linux/of.h>
29 #include <linux/of_gpio.h>
30 #include <linux/regmap.h>
31 #include <linux/dma-mapping.h>
32 #include <linux/bcd.h>
33 #include <linux/version.h>
34 #include <linux/usb.h>
35 #include <linux/usb/hcd.h>
36 
37 #include "vhub.h"
38 
39 /* usb 2.0 hub device descriptor
40  *
41  * A few things we may want to improve here:
42  *
43  *    - We may need to indicate TT support
44  *    - We may need a device qualifier descriptor
45  *	as devices can pretend to be usb1 or 2
46  *    - Make vid/did overridable
47  *    - make it look like usb1 if usb1 mode forced
48  */
49 #define KERNEL_REL	bin2bcd(((LINUX_VERSION_CODE >> 16) & 0x0ff))
50 #define KERNEL_VER	bin2bcd(((LINUX_VERSION_CODE >> 8) & 0x0ff))
51 
52 enum {
53 	AST_VHUB_STR_MANUF = 3,
54 	AST_VHUB_STR_PRODUCT = 2,
55 	AST_VHUB_STR_SERIAL = 1,
56 };
57 
58 static const struct usb_device_descriptor ast_vhub_dev_desc = {
59 	.bLength		= USB_DT_DEVICE_SIZE,
60 	.bDescriptorType	= USB_DT_DEVICE,
61 	.bcdUSB			= cpu_to_le16(0x0200),
62 	.bDeviceClass		= USB_CLASS_HUB,
63 	.bDeviceSubClass	= 0,
64 	.bDeviceProtocol	= 1,
65 	.bMaxPacketSize0	= 64,
66 	.idVendor		= cpu_to_le16(0x1d6b),
67 	.idProduct		= cpu_to_le16(0x0107),
68 	.bcdDevice		= cpu_to_le16(0x0100),
69 	.iManufacturer		= AST_VHUB_STR_MANUF,
70 	.iProduct		= AST_VHUB_STR_PRODUCT,
71 	.iSerialNumber		= AST_VHUB_STR_SERIAL,
72 	.bNumConfigurations	= 1,
73 };
74 
75 /* Patches to the above when forcing USB1 mode */
76 static void ast_vhub_patch_dev_desc_usb1(struct usb_device_descriptor *desc)
77 {
78 	desc->bcdUSB = cpu_to_le16(0x0100);
79 	desc->bDeviceProtocol = 0;
80 }
81 
82 /*
83  * Configuration descriptor: same comments as above
84  * regarding handling USB1 mode.
85  */
86 
87 /*
88  * We don't use sizeof() as Linux definition of
89  * struct usb_endpoint_descriptor contains 2
90  * extra bytes
91  */
92 #define AST_VHUB_CONF_DESC_SIZE	(USB_DT_CONFIG_SIZE + \
93 				 USB_DT_INTERFACE_SIZE + \
94 				 USB_DT_ENDPOINT_SIZE)
95 
96 static const struct ast_vhub_full_cdesc {
97 	struct usb_config_descriptor	cfg;
98 	struct usb_interface_descriptor intf;
99 	struct usb_endpoint_descriptor	ep;
100 } __attribute__ ((packed)) ast_vhub_conf_desc = {
101 	.cfg = {
102 		.bLength		= USB_DT_CONFIG_SIZE,
103 		.bDescriptorType	= USB_DT_CONFIG,
104 		.wTotalLength		= cpu_to_le16(AST_VHUB_CONF_DESC_SIZE),
105 		.bNumInterfaces		= 1,
106 		.bConfigurationValue	= 1,
107 		.iConfiguration		= 0,
108 		.bmAttributes		= USB_CONFIG_ATT_ONE |
109 					  USB_CONFIG_ATT_SELFPOWER |
110 					  USB_CONFIG_ATT_WAKEUP,
111 		.bMaxPower		= 0,
112 	},
113 	.intf = {
114 		.bLength		= USB_DT_INTERFACE_SIZE,
115 		.bDescriptorType	= USB_DT_INTERFACE,
116 		.bInterfaceNumber	= 0,
117 		.bAlternateSetting	= 0,
118 		.bNumEndpoints		= 1,
119 		.bInterfaceClass	= USB_CLASS_HUB,
120 		.bInterfaceSubClass	= 0,
121 		.bInterfaceProtocol	= 0,
122 		.iInterface		= 0,
123 	},
124 	.ep = {
125 		.bLength		= USB_DT_ENDPOINT_SIZE,
126 		.bDescriptorType	= USB_DT_ENDPOINT,
127 		.bEndpointAddress	= 0x81,
128 		.bmAttributes		= USB_ENDPOINT_XFER_INT,
129 		.wMaxPacketSize		= cpu_to_le16(1),
130 		.bInterval		= 0x0c,
131 	},
132 };
133 
134 #define AST_VHUB_HUB_DESC_SIZE	(USB_DT_HUB_NONVAR_SIZE + 2)
135 
136 static const struct usb_hub_descriptor ast_vhub_hub_desc = {
137 	.bDescLength			= AST_VHUB_HUB_DESC_SIZE,
138 	.bDescriptorType		= USB_DT_HUB,
139 	.bNbrPorts			= AST_VHUB_NUM_PORTS,
140 	.wHubCharacteristics		= cpu_to_le16(HUB_CHAR_NO_LPSM),
141 	.bPwrOn2PwrGood			= 10,
142 	.bHubContrCurrent		= 0,
143 	.u.hs.DeviceRemovable[0]	= 0,
144 	.u.hs.DeviceRemovable[1]	= 0xff,
145 };
146 
147 /*
148  * These strings converted to UTF-16 must be smaller than
149  * our EP0 buffer.
150  */
151 static const struct usb_string ast_vhub_str_array[] = {
152 	{
153 		.id = AST_VHUB_STR_SERIAL,
154 		.s = "00000000"
155 	},
156 	{
157 		.id = AST_VHUB_STR_PRODUCT,
158 		.s = "USB Virtual Hub"
159 	},
160 	{
161 		.id = AST_VHUB_STR_MANUF,
162 		.s = "Aspeed"
163 	},
164 	{ }
165 };
166 
167 static const struct usb_gadget_strings ast_vhub_strings = {
168 	.language = 0x0409,
169 	.strings = (struct usb_string *)ast_vhub_str_array
170 };
171 
172 static int ast_vhub_hub_dev_status(struct ast_vhub_ep *ep,
173 				   u16 wIndex, u16 wValue)
174 {
175 	u8 st0;
176 
177 	EPDBG(ep, "GET_STATUS(dev)\n");
178 
179 	/*
180 	 * Mark it as self-powered, I doubt the BMC is powered off
181 	 * the USB bus ...
182 	 */
183 	st0 = 1 << USB_DEVICE_SELF_POWERED;
184 
185 	/*
186 	 * Need to double check how remote wakeup actually works
187 	 * on that chip and what triggers it.
188 	 */
189 	if (ep->vhub->wakeup_en)
190 		st0 |= 1 << USB_DEVICE_REMOTE_WAKEUP;
191 
192 	return ast_vhub_simple_reply(ep, st0, 0);
193 }
194 
195 static int ast_vhub_hub_ep_status(struct ast_vhub_ep *ep,
196 				  u16 wIndex, u16 wValue)
197 {
198 	int ep_num;
199 	u8 st0 = 0;
200 
201 	ep_num = wIndex & USB_ENDPOINT_NUMBER_MASK;
202 	EPDBG(ep, "GET_STATUS(ep%d)\n", ep_num);
203 
204 	/* On the hub we have only EP 0 and 1 */
205 	if (ep_num == 1) {
206 		if (ep->vhub->ep1_stalled)
207 			st0 |= 1 << USB_ENDPOINT_HALT;
208 	} else if (ep_num != 0)
209 		return std_req_stall;
210 
211 	return ast_vhub_simple_reply(ep, st0, 0);
212 }
213 
214 static int ast_vhub_hub_dev_feature(struct ast_vhub_ep *ep,
215 				    u16 wIndex, u16 wValue,
216 				    bool is_set)
217 {
218 	EPDBG(ep, "%s_FEATURE(dev val=%02x)\n",
219 	      is_set ? "SET" : "CLEAR", wValue);
220 
221 	if (wValue != USB_DEVICE_REMOTE_WAKEUP)
222 		return std_req_stall;
223 
224 	ep->vhub->wakeup_en = is_set;
225 	EPDBG(ep, "Hub remote wakeup %s\n",
226 	      is_set ? "enabled" : "disabled");
227 
228 	return std_req_complete;
229 }
230 
231 static int ast_vhub_hub_ep_feature(struct ast_vhub_ep *ep,
232 				   u16 wIndex, u16 wValue,
233 				   bool is_set)
234 {
235 	int ep_num;
236 	u32 reg;
237 
238 	ep_num = wIndex & USB_ENDPOINT_NUMBER_MASK;
239 	EPDBG(ep, "%s_FEATURE(ep%d val=%02x)\n",
240 	      is_set ? "SET" : "CLEAR", ep_num, wValue);
241 
242 	if (ep_num > 1)
243 		return std_req_stall;
244 	if (wValue != USB_ENDPOINT_HALT)
245 		return std_req_stall;
246 	if (ep_num == 0)
247 		return std_req_complete;
248 
249 	EPDBG(ep, "%s stall on EP 1\n",
250 	      is_set ? "setting" : "clearing");
251 
252 	ep->vhub->ep1_stalled = is_set;
253 	reg = readl(ep->vhub->regs + AST_VHUB_EP1_CTRL);
254 	if (is_set) {
255 		reg |= VHUB_EP1_CTRL_STALL;
256 	} else {
257 		reg &= ~VHUB_EP1_CTRL_STALL;
258 		reg |= VHUB_EP1_CTRL_RESET_TOGGLE;
259 	}
260 	writel(reg, ep->vhub->regs + AST_VHUB_EP1_CTRL);
261 
262 	return std_req_complete;
263 }
264 
265 static int ast_vhub_rep_desc(struct ast_vhub_ep *ep,
266 			     u8 desc_type, u16 len)
267 {
268 	size_t dsize;
269 
270 	EPDBG(ep, "GET_DESCRIPTOR(type:%d)\n", desc_type);
271 
272 	/*
273 	 * Copy first to EP buffer and send from there, so
274 	 * we can do some in-place patching if needed. We know
275 	 * the EP buffer is big enough but ensure that doesn't
276 	 * change. We do that now rather than later after we
277 	 * have checked sizes etc... to avoid a gcc bug where
278 	 * it thinks len is constant and barfs about read
279 	 * overflows in memcpy.
280 	 */
281 	switch(desc_type) {
282 	case USB_DT_DEVICE:
283 		dsize = USB_DT_DEVICE_SIZE;
284 		memcpy(ep->buf, &ast_vhub_dev_desc, dsize);
285 		BUILD_BUG_ON(dsize > sizeof(ast_vhub_dev_desc));
286 		BUILD_BUG_ON(USB_DT_DEVICE_SIZE >= AST_VHUB_EP0_MAX_PACKET);
287 		break;
288 	case USB_DT_CONFIG:
289 		dsize = AST_VHUB_CONF_DESC_SIZE;
290 		memcpy(ep->buf, &ast_vhub_conf_desc, dsize);
291 		BUILD_BUG_ON(dsize > sizeof(ast_vhub_conf_desc));
292 		BUILD_BUG_ON(AST_VHUB_CONF_DESC_SIZE >= AST_VHUB_EP0_MAX_PACKET);
293 		break;
294 	case USB_DT_HUB:
295 		dsize = AST_VHUB_HUB_DESC_SIZE;
296 		memcpy(ep->buf, &ast_vhub_hub_desc, dsize);
297 		BUILD_BUG_ON(dsize > sizeof(ast_vhub_hub_desc));
298 		BUILD_BUG_ON(AST_VHUB_HUB_DESC_SIZE >= AST_VHUB_EP0_MAX_PACKET);
299 		break;
300 	default:
301 		return std_req_stall;
302 	}
303 
304 	/* Crop requested length */
305 	if (len > dsize)
306 		len = dsize;
307 
308 	/* Patch it if forcing USB1 */
309 	if (desc_type == USB_DT_DEVICE && ep->vhub->force_usb1)
310 		ast_vhub_patch_dev_desc_usb1(ep->buf);
311 
312 	/* Shoot it from the EP buffer */
313 	return ast_vhub_reply(ep, NULL, len);
314 }
315 
316 static int ast_vhub_rep_string(struct ast_vhub_ep *ep,
317 			       u8 string_id, u16 lang_id,
318 			       u16 len)
319 {
320 	int rc = usb_gadget_get_string (&ast_vhub_strings, string_id, ep->buf);
321 
322 	/*
323 	 * This should never happen unless we put too big strings in
324 	 * the array above
325 	 */
326 	BUG_ON(rc >= AST_VHUB_EP0_MAX_PACKET);
327 
328 	if (rc < 0)
329 		return std_req_stall;
330 
331 	/* Shoot it from the EP buffer */
332 	return ast_vhub_reply(ep, NULL, min_t(u16, rc, len));
333 }
334 
335 enum std_req_rc ast_vhub_std_hub_request(struct ast_vhub_ep *ep,
336 					 struct usb_ctrlrequest *crq)
337 {
338 	struct ast_vhub *vhub = ep->vhub;
339 	u16 wValue, wIndex, wLength;
340 
341 	wValue = le16_to_cpu(crq->wValue);
342 	wIndex = le16_to_cpu(crq->wIndex);
343 	wLength = le16_to_cpu(crq->wLength);
344 
345 	/* First packet, grab speed */
346 	if (vhub->speed == USB_SPEED_UNKNOWN) {
347 		u32 ustat = readl(vhub->regs + AST_VHUB_USBSTS);
348 		if (ustat & VHUB_USBSTS_HISPEED)
349 			vhub->speed = USB_SPEED_HIGH;
350 		else
351 			vhub->speed = USB_SPEED_FULL;
352 		UDCDBG(vhub, "USB status=%08x speed=%s\n", ustat,
353 		       vhub->speed == USB_SPEED_HIGH ? "high" : "full");
354 	}
355 
356 	switch ((crq->bRequestType << 8) | crq->bRequest) {
357 		/* SET_ADDRESS */
358 	case DeviceOutRequest | USB_REQ_SET_ADDRESS:
359 		EPDBG(ep, "SET_ADDRESS: Got address %x\n", wValue);
360 		writel(wValue, vhub->regs + AST_VHUB_CONF);
361 		return std_req_complete;
362 
363 		/* GET_STATUS */
364 	case DeviceRequest | USB_REQ_GET_STATUS:
365 		return ast_vhub_hub_dev_status(ep, wIndex, wValue);
366 	case InterfaceRequest | USB_REQ_GET_STATUS:
367 		return ast_vhub_simple_reply(ep, 0, 0);
368 	case EndpointRequest | USB_REQ_GET_STATUS:
369 		return ast_vhub_hub_ep_status(ep, wIndex, wValue);
370 
371 		/* SET/CLEAR_FEATURE */
372 	case DeviceOutRequest | USB_REQ_SET_FEATURE:
373 		return ast_vhub_hub_dev_feature(ep, wIndex, wValue, true);
374 	case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
375 		return ast_vhub_hub_dev_feature(ep, wIndex, wValue, false);
376 	case EndpointOutRequest | USB_REQ_SET_FEATURE:
377 		return ast_vhub_hub_ep_feature(ep, wIndex, wValue, true);
378 	case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
379 		return ast_vhub_hub_ep_feature(ep, wIndex, wValue, false);
380 
381 		/* GET/SET_CONFIGURATION */
382 	case DeviceRequest | USB_REQ_GET_CONFIGURATION:
383 		return ast_vhub_simple_reply(ep, 1);
384 	case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
385 		if (wValue != 1)
386 			return std_req_stall;
387 		return std_req_complete;
388 
389 		/* GET_DESCRIPTOR */
390 	case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
391 		switch (wValue >> 8) {
392 		case USB_DT_DEVICE:
393 		case USB_DT_CONFIG:
394 			return ast_vhub_rep_desc(ep, wValue >> 8,
395 						 wLength);
396 		case USB_DT_STRING:
397 			return ast_vhub_rep_string(ep, wValue & 0xff,
398 						   wIndex, wLength);
399 		}
400 		return std_req_stall;
401 
402 		/* GET/SET_INTERFACE */
403 	case DeviceRequest | USB_REQ_GET_INTERFACE:
404 		return ast_vhub_simple_reply(ep, 0);
405 	case DeviceOutRequest | USB_REQ_SET_INTERFACE:
406 		if (wValue != 0 || wIndex != 0)
407 			return std_req_stall;
408 		return std_req_complete;
409 	}
410 	return std_req_stall;
411 }
412 
413 static void ast_vhub_update_hub_ep1(struct ast_vhub *vhub,
414 				    unsigned int port)
415 {
416 	/* Update HW EP1 response */
417 	u32 reg = readl(vhub->regs + AST_VHUB_EP1_STS_CHG);
418 	u32 pmask = (1 << (port + 1));
419 	if (vhub->ports[port].change)
420 		reg |= pmask;
421 	else
422 		reg &= ~pmask;
423 	writel(reg, vhub->regs + AST_VHUB_EP1_STS_CHG);
424 }
425 
426 static void ast_vhub_change_port_stat(struct ast_vhub *vhub,
427 				      unsigned int port,
428 				      u16 clr_flags,
429 				      u16 set_flags,
430 				      bool set_c)
431 {
432 	struct ast_vhub_port *p = &vhub->ports[port];
433 	u16 prev;
434 
435 	/* Update port status */
436 	prev = p->status;
437 	p->status = (prev & ~clr_flags) | set_flags;
438 	DDBG(&p->dev, "port %d status %04x -> %04x (C=%d)\n",
439 	     port + 1, prev, p->status, set_c);
440 
441 	/* Update change bits if needed */
442 	if (set_c) {
443 		u16 chg = p->status ^ prev;
444 
445 		/* Only these are relevant for change */
446 		chg &= USB_PORT_STAT_C_CONNECTION |
447 		       USB_PORT_STAT_C_ENABLE |
448 		       USB_PORT_STAT_C_SUSPEND |
449 		       USB_PORT_STAT_C_OVERCURRENT |
450 		       USB_PORT_STAT_C_RESET |
451 		       USB_PORT_STAT_C_L1;
452 		p->change |= chg;
453 
454 		ast_vhub_update_hub_ep1(vhub, port);
455 	}
456 }
457 
458 static void ast_vhub_send_host_wakeup(struct ast_vhub *vhub)
459 {
460 	u32 reg = readl(vhub->regs + AST_VHUB_CTRL);
461 	UDCDBG(vhub, "Waking up host !\n");
462 	reg |= VHUB_CTRL_MANUAL_REMOTE_WAKEUP;
463 	writel(reg, vhub->regs + AST_VHUB_CTRL);
464 }
465 
466 void ast_vhub_device_connect(struct ast_vhub *vhub,
467 			     unsigned int port, bool on)
468 {
469 	if (on)
470 		ast_vhub_change_port_stat(vhub, port, 0,
471 					  USB_PORT_STAT_CONNECTION, true);
472 	else
473 		ast_vhub_change_port_stat(vhub, port,
474 					  USB_PORT_STAT_CONNECTION |
475 					  USB_PORT_STAT_ENABLE,
476 					  0, true);
477 
478 	/*
479 	 * If the hub is set to wakup the host on connection events
480 	 * then send a wakeup.
481 	 */
482 	if (vhub->wakeup_en)
483 		ast_vhub_send_host_wakeup(vhub);
484 }
485 
486 static void ast_vhub_wake_work(struct work_struct *work)
487 {
488 	struct ast_vhub *vhub = container_of(work,
489 					     struct ast_vhub,
490 					     wake_work);
491 	unsigned long flags;
492 	unsigned int i;
493 
494 	/*
495 	 * Wake all sleeping ports. If a port is suspended by
496 	 * the host suspend (without explicit state suspend),
497 	 * we let the normal host wake path deal with it later.
498 	 */
499 	spin_lock_irqsave(&vhub->lock, flags);
500 	for (i = 0; i < AST_VHUB_NUM_PORTS; i++) {
501 		struct ast_vhub_port *p = &vhub->ports[i];
502 
503 		if (!(p->status & USB_PORT_STAT_SUSPEND))
504 			continue;
505 		ast_vhub_change_port_stat(vhub, i,
506 					  USB_PORT_STAT_SUSPEND,
507 					  0, true);
508 		ast_vhub_dev_resume(&p->dev);
509 	}
510 	ast_vhub_send_host_wakeup(vhub);
511 	spin_unlock_irqrestore(&vhub->lock, flags);
512 }
513 
514 void ast_vhub_hub_wake_all(struct ast_vhub *vhub)
515 {
516 	/*
517 	 * A device is trying to wake the world, because this
518 	 * can recurse into the device, we break the call chain
519 	 * using a work queue
520 	 */
521 	schedule_work(&vhub->wake_work);
522 }
523 
524 static void ast_vhub_port_reset(struct ast_vhub *vhub, u8 port)
525 {
526 	struct ast_vhub_port *p = &vhub->ports[port];
527 	u16 set, clr, speed;
528 
529 	/* First mark disabled */
530 	ast_vhub_change_port_stat(vhub, port,
531 				  USB_PORT_STAT_ENABLE |
532 				  USB_PORT_STAT_SUSPEND,
533 				  USB_PORT_STAT_RESET,
534 				  false);
535 
536 	if (!p->dev.driver)
537 		return;
538 
539 	/*
540 	 * This will either "start" the port or reset the
541 	 * device if already started...
542 	 */
543 	ast_vhub_dev_reset(&p->dev);
544 
545 	/* Grab the right speed */
546 	speed = p->dev.driver->max_speed;
547 	if (speed == USB_SPEED_UNKNOWN || speed > vhub->speed)
548 		speed = vhub->speed;
549 
550 	switch (speed) {
551 	case USB_SPEED_LOW:
552 		set = USB_PORT_STAT_LOW_SPEED;
553 		clr = USB_PORT_STAT_HIGH_SPEED;
554 		break;
555 	case USB_SPEED_FULL:
556 		set = 0;
557 		clr = USB_PORT_STAT_LOW_SPEED |
558 			USB_PORT_STAT_HIGH_SPEED;
559 		break;
560 	case USB_SPEED_HIGH:
561 		set = USB_PORT_STAT_HIGH_SPEED;
562 		clr = USB_PORT_STAT_LOW_SPEED;
563 		break;
564 	default:
565 		UDCDBG(vhub, "Unsupported speed %d when"
566 		       " connecting device\n",
567 		       speed);
568 		return;
569 	}
570 	clr |= USB_PORT_STAT_RESET;
571 	set |= USB_PORT_STAT_ENABLE;
572 
573 	/* This should ideally be delayed ... */
574 	ast_vhub_change_port_stat(vhub, port, clr, set, true);
575 }
576 
577 static enum std_req_rc ast_vhub_set_port_feature(struct ast_vhub_ep *ep,
578 						 u8 port, u16 feat)
579 {
580 	struct ast_vhub *vhub = ep->vhub;
581 	struct ast_vhub_port *p;
582 
583 	if (port == 0 || port > AST_VHUB_NUM_PORTS)
584 		return std_req_stall;
585 	port--;
586 	p = &vhub->ports[port];
587 
588 	switch(feat) {
589 	case USB_PORT_FEAT_SUSPEND:
590 		if (!(p->status & USB_PORT_STAT_ENABLE))
591 			return std_req_complete;
592 		ast_vhub_change_port_stat(vhub, port,
593 					  0, USB_PORT_STAT_SUSPEND,
594 					  false);
595 		ast_vhub_dev_suspend(&p->dev);
596 		return std_req_complete;
597 	case USB_PORT_FEAT_RESET:
598 		EPDBG(ep, "Port reset !\n");
599 		ast_vhub_port_reset(vhub, port);
600 		return std_req_complete;
601 	case USB_PORT_FEAT_POWER:
602 		/*
603 		 * On Power-on, we mark the connected flag changed,
604 		 * if there's a connected device, some hosts will
605 		 * otherwise fail to detect it.
606 		 */
607 		if (p->status & USB_PORT_STAT_CONNECTION) {
608 			p->change |= USB_PORT_STAT_C_CONNECTION;
609 			ast_vhub_update_hub_ep1(vhub, port);
610 		}
611 		return std_req_complete;
612 	case USB_PORT_FEAT_TEST:
613 	case USB_PORT_FEAT_INDICATOR:
614 		/* We don't do anything with these */
615 		return std_req_complete;
616 	}
617 	return std_req_stall;
618 }
619 
620 static enum std_req_rc ast_vhub_clr_port_feature(struct ast_vhub_ep *ep,
621 						 u8 port, u16 feat)
622 {
623 	struct ast_vhub *vhub = ep->vhub;
624 	struct ast_vhub_port *p;
625 
626 	if (port == 0 || port > AST_VHUB_NUM_PORTS)
627 		return std_req_stall;
628 	port--;
629 	p = &vhub->ports[port];
630 
631 	switch(feat) {
632 	case USB_PORT_FEAT_ENABLE:
633 		ast_vhub_change_port_stat(vhub, port,
634 					  USB_PORT_STAT_ENABLE |
635 					  USB_PORT_STAT_SUSPEND, 0,
636 					  false);
637 		ast_vhub_dev_suspend(&p->dev);
638 		return std_req_complete;
639 	case USB_PORT_FEAT_SUSPEND:
640 		if (!(p->status & USB_PORT_STAT_SUSPEND))
641 			return std_req_complete;
642 		ast_vhub_change_port_stat(vhub, port,
643 					  USB_PORT_STAT_SUSPEND, 0,
644 					  false);
645 		ast_vhub_dev_resume(&p->dev);
646 		return std_req_complete;
647 	case USB_PORT_FEAT_POWER:
648 		/* We don't do power control */
649 		return std_req_complete;
650 	case USB_PORT_FEAT_INDICATOR:
651 		/* We don't have indicators */
652 		return std_req_complete;
653 	case USB_PORT_FEAT_C_CONNECTION:
654 	case USB_PORT_FEAT_C_ENABLE:
655 	case USB_PORT_FEAT_C_SUSPEND:
656 	case USB_PORT_FEAT_C_OVER_CURRENT:
657 	case USB_PORT_FEAT_C_RESET:
658 		/* Clear state-change feature */
659 		p->change &= ~(1u << (feat - 16));
660 		ast_vhub_update_hub_ep1(vhub, port);
661 		return std_req_complete;
662 	}
663 	return std_req_stall;
664 }
665 
666 static enum std_req_rc ast_vhub_get_port_stat(struct ast_vhub_ep *ep,
667 					      u8 port)
668 {
669 	struct ast_vhub *vhub = ep->vhub;
670 	u16 stat, chg;
671 
672 	if (port == 0 || port > AST_VHUB_NUM_PORTS)
673 		return std_req_stall;
674 	port--;
675 
676 	stat = vhub->ports[port].status;
677 	chg = vhub->ports[port].change;
678 
679 	/* We always have power */
680 	stat |= USB_PORT_STAT_POWER;
681 
682 	EPDBG(ep, " port status=%04x change=%04x\n", stat, chg);
683 
684 	return ast_vhub_simple_reply(ep,
685 				     stat & 0xff,
686 				     stat >> 8,
687 				     chg & 0xff,
688 				     chg >> 8);
689 }
690 
691 enum std_req_rc ast_vhub_class_hub_request(struct ast_vhub_ep *ep,
692 					   struct usb_ctrlrequest *crq)
693 {
694 	u16 wValue, wIndex, wLength;
695 
696 	wValue = le16_to_cpu(crq->wValue);
697 	wIndex = le16_to_cpu(crq->wIndex);
698 	wLength = le16_to_cpu(crq->wLength);
699 
700 	switch ((crq->bRequestType << 8) | crq->bRequest) {
701 	case GetHubStatus:
702 		EPDBG(ep, "GetHubStatus\n");
703 		return ast_vhub_simple_reply(ep, 0, 0, 0, 0);
704 	case GetPortStatus:
705 		EPDBG(ep, "GetPortStatus(%d)\n", wIndex & 0xff);
706 		return ast_vhub_get_port_stat(ep, wIndex & 0xf);
707 	case GetHubDescriptor:
708 		if (wValue != (USB_DT_HUB << 8))
709 			return std_req_stall;
710 		EPDBG(ep, "GetHubDescriptor(%d)\n", wIndex & 0xff);
711 		return ast_vhub_rep_desc(ep, USB_DT_HUB, wLength);
712 	case SetHubFeature:
713 	case ClearHubFeature:
714 		EPDBG(ep, "Get/SetHubFeature(%d)\n", wValue);
715 		/* No feature, just complete the requests */
716 		if (wValue == C_HUB_LOCAL_POWER ||
717 		    wValue == C_HUB_OVER_CURRENT)
718 			return std_req_complete;
719 		return std_req_stall;
720 	case SetPortFeature:
721 		EPDBG(ep, "SetPortFeature(%d,%d)\n", wIndex & 0xf, wValue);
722 		return ast_vhub_set_port_feature(ep, wIndex & 0xf, wValue);
723 	case ClearPortFeature:
724 		EPDBG(ep, "ClearPortFeature(%d,%d)\n", wIndex & 0xf, wValue);
725 		return ast_vhub_clr_port_feature(ep, wIndex & 0xf, wValue);
726 	default:
727 		EPDBG(ep, "Unknown class request\n");
728 	}
729 	return std_req_stall;
730 }
731 
732 void ast_vhub_hub_suspend(struct ast_vhub *vhub)
733 {
734 	unsigned int i;
735 
736 	UDCDBG(vhub, "USB bus suspend\n");
737 
738 	if (vhub->suspended)
739 		return;
740 
741 	vhub->suspended = true;
742 
743 	/*
744 	 * Forward to unsuspended ports without changing
745 	 * their connection status.
746 	 */
747 	for (i = 0; i < AST_VHUB_NUM_PORTS; i++) {
748 		struct ast_vhub_port *p = &vhub->ports[i];
749 
750 		if (!(p->status & USB_PORT_STAT_SUSPEND))
751 			ast_vhub_dev_suspend(&p->dev);
752 	}
753 }
754 
755 void ast_vhub_hub_resume(struct ast_vhub *vhub)
756 {
757 	unsigned int i;
758 
759 	UDCDBG(vhub, "USB bus resume\n");
760 
761 	if (!vhub->suspended)
762 		return;
763 
764 	vhub->suspended = false;
765 
766 	/*
767 	 * Forward to unsuspended ports without changing
768 	 * their connection status.
769 	 */
770 	for (i = 0; i < AST_VHUB_NUM_PORTS; i++) {
771 		struct ast_vhub_port *p = &vhub->ports[i];
772 
773 		if (!(p->status & USB_PORT_STAT_SUSPEND))
774 			ast_vhub_dev_resume(&p->dev);
775 	}
776 }
777 
778 void ast_vhub_hub_reset(struct ast_vhub *vhub)
779 {
780 	unsigned int i;
781 
782 	UDCDBG(vhub, "USB bus reset\n");
783 
784 	/*
785 	 * Is the speed known ? If not we don't care, we aren't
786 	 * initialized yet and ports haven't been enabled.
787 	 */
788 	if (vhub->speed == USB_SPEED_UNKNOWN)
789 		return;
790 
791 	/* We aren't suspended anymore obviously */
792 	vhub->suspended = false;
793 
794 	/* No speed set */
795 	vhub->speed = USB_SPEED_UNKNOWN;
796 
797 	/* Wakeup not enabled anymore */
798 	vhub->wakeup_en = false;
799 
800 	/*
801 	 * Clear all port status, disable gadgets and "suspend"
802 	 * them. They will be woken up by a port reset.
803 	 */
804 	for (i = 0; i < AST_VHUB_NUM_PORTS; i++) {
805 		struct ast_vhub_port *p = &vhub->ports[i];
806 
807 		/* Only keep the connected flag */
808 		p->status &= USB_PORT_STAT_CONNECTION;
809 		p->change = 0;
810 
811 		/* Suspend the gadget if any */
812 		ast_vhub_dev_suspend(&p->dev);
813 	}
814 
815 	/* Cleanup HW */
816 	writel(0, vhub->regs + AST_VHUB_CONF);
817 	writel(0, vhub->regs + AST_VHUB_EP0_CTRL);
818 	writel(VHUB_EP1_CTRL_RESET_TOGGLE |
819 	       VHUB_EP1_CTRL_ENABLE,
820 	       vhub->regs + AST_VHUB_EP1_CTRL);
821 	writel(0, vhub->regs + AST_VHUB_EP1_STS_CHG);
822 }
823 
824 void ast_vhub_init_hub(struct ast_vhub *vhub)
825 {
826 	vhub->speed = USB_SPEED_UNKNOWN;
827 	INIT_WORK(&vhub->wake_work, ast_vhub_wake_work);
828 }
829 
830