1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2001-2002 by David Brownell
4  */
5 
6 #ifndef __USB_CORE_HCD_H
7 #define __USB_CORE_HCD_H
8 
9 #ifdef __KERNEL__
10 
11 #include <linux/rwsem.h>
12 #include <linux/interrupt.h>
13 #include <linux/idr.h>
14 
15 #define MAX_TOPO_LEVEL		6
16 
17 /* This file contains declarations of usbcore internals that are mostly
18  * used or exposed by Host Controller Drivers.
19  */
20 
21 /*
22  * USB Packet IDs (PIDs)
23  */
24 #define USB_PID_EXT			0xf0	/* USB 2.0 LPM ECN */
25 #define USB_PID_OUT			0xe1
26 #define USB_PID_ACK			0xd2
27 #define USB_PID_DATA0			0xc3
28 #define USB_PID_PING			0xb4	/* USB 2.0 */
29 #define USB_PID_SOF			0xa5
30 #define USB_PID_NYET			0x96	/* USB 2.0 */
31 #define USB_PID_DATA2			0x87	/* USB 2.0 */
32 #define USB_PID_SPLIT			0x78	/* USB 2.0 */
33 #define USB_PID_IN			0x69
34 #define USB_PID_NAK			0x5a
35 #define USB_PID_DATA1			0x4b
36 #define USB_PID_PREAMBLE		0x3c	/* Token mode */
37 #define USB_PID_ERR			0x3c	/* USB 2.0: handshake mode */
38 #define USB_PID_SETUP			0x2d
39 #define USB_PID_STALL			0x1e
40 #define USB_PID_MDATA			0x0f	/* USB 2.0 */
41 
42 /*-------------------------------------------------------------------------*/
43 
44 /*
45  * USB Host Controller Driver (usb_hcd) framework
46  *
47  * Since "struct usb_bus" is so thin, you can't share much code in it.
48  * This framework is a layer over that, and should be more shareable.
49  */
50 
51 /*-------------------------------------------------------------------------*/
52 
53 struct giveback_urb_bh {
54 	bool running;
55 	bool high_prio;
56 	spinlock_t lock;
57 	struct list_head  head;
58 	struct tasklet_struct bh;
59 	struct usb_host_endpoint *completing_ep;
60 };
61 
62 enum usb_dev_authorize_policy {
63 	USB_DEVICE_AUTHORIZE_NONE	= 0,
64 	USB_DEVICE_AUTHORIZE_ALL	= 1,
65 	USB_DEVICE_AUTHORIZE_INTERNAL	= 2,
66 };
67 
68 struct usb_hcd {
69 
70 	/*
71 	 * housekeeping
72 	 */
73 	struct usb_bus		self;		/* hcd is-a bus */
74 	struct kref		kref;		/* reference counter */
75 
76 	const char		*product_desc;	/* product/vendor string */
77 	int			speed;		/* Speed for this roothub.
78 						 * May be different from
79 						 * hcd->driver->flags & HCD_MASK
80 						 */
81 	char			irq_descr[24];	/* driver + bus # */
82 
83 	struct timer_list	rh_timer;	/* drives root-hub polling */
84 	struct urb		*status_urb;	/* the current status urb */
85 #ifdef CONFIG_PM
86 	struct work_struct	wakeup_work;	/* for remote wakeup */
87 #endif
88 	struct work_struct	died_work;	/* for when the device dies */
89 
90 	/*
91 	 * hardware info/state
92 	 */
93 	const struct hc_driver	*driver;	/* hw-specific hooks */
94 
95 	/*
96 	 * OTG and some Host controllers need software interaction with phys;
97 	 * other external phys should be software-transparent
98 	 */
99 	struct usb_phy		*usb_phy;
100 	struct usb_phy_roothub	*phy_roothub;
101 
102 	/* Flags that need to be manipulated atomically because they can
103 	 * change while the host controller is running.  Always use
104 	 * set_bit() or clear_bit() to change their values.
105 	 */
106 	unsigned long		flags;
107 #define HCD_FLAG_HW_ACCESSIBLE		0	/* at full power */
108 #define HCD_FLAG_POLL_RH		2	/* poll for rh status? */
109 #define HCD_FLAG_POLL_PENDING		3	/* status has changed? */
110 #define HCD_FLAG_WAKEUP_PENDING		4	/* root hub is resuming? */
111 #define HCD_FLAG_RH_RUNNING		5	/* root hub is running? */
112 #define HCD_FLAG_DEAD			6	/* controller has died? */
113 #define HCD_FLAG_INTF_AUTHORIZED	7	/* authorize interfaces? */
114 #define HCD_FLAG_DEFER_RH_REGISTER	8	/* Defer roothub registration */
115 
116 	/* The flags can be tested using these macros; they are likely to
117 	 * be slightly faster than test_bit().
118 	 */
119 #define HCD_HW_ACCESSIBLE(hcd)	((hcd)->flags & (1U << HCD_FLAG_HW_ACCESSIBLE))
120 #define HCD_POLL_RH(hcd)	((hcd)->flags & (1U << HCD_FLAG_POLL_RH))
121 #define HCD_POLL_PENDING(hcd)	((hcd)->flags & (1U << HCD_FLAG_POLL_PENDING))
122 #define HCD_WAKEUP_PENDING(hcd)	((hcd)->flags & (1U << HCD_FLAG_WAKEUP_PENDING))
123 #define HCD_RH_RUNNING(hcd)	((hcd)->flags & (1U << HCD_FLAG_RH_RUNNING))
124 #define HCD_DEAD(hcd)		((hcd)->flags & (1U << HCD_FLAG_DEAD))
125 #define HCD_DEFER_RH_REGISTER(hcd) ((hcd)->flags & (1U << HCD_FLAG_DEFER_RH_REGISTER))
126 
127 	/*
128 	 * Specifies if interfaces are authorized by default
129 	 * or they require explicit user space authorization; this bit is
130 	 * settable through /sys/class/usb_host/X/interface_authorized_default
131 	 */
132 #define HCD_INTF_AUTHORIZED(hcd) \
133 	((hcd)->flags & (1U << HCD_FLAG_INTF_AUTHORIZED))
134 
135 	/*
136 	 * Specifies if devices are authorized by default
137 	 * or they require explicit user space authorization; this bit is
138 	 * settable through /sys/class/usb_host/X/authorized_default
139 	 */
140 	enum usb_dev_authorize_policy dev_policy;
141 
142 	/* Flags that get set only during HCD registration or removal. */
143 	unsigned		rh_registered:1;/* is root hub registered? */
144 	unsigned		rh_pollable:1;	/* may we poll the root hub? */
145 	unsigned		msix_enabled:1;	/* driver has MSI-X enabled? */
146 	unsigned		msi_enabled:1;	/* driver has MSI enabled? */
147 	/*
148 	 * do not manage the PHY state in the HCD core, instead let the driver
149 	 * handle this (for example if the PHY can only be turned on after a
150 	 * specific event)
151 	 */
152 	unsigned		skip_phy_initialization:1;
153 
154 	/* The next flag is a stopgap, to be removed when all the HCDs
155 	 * support the new root-hub polling mechanism. */
156 	unsigned		uses_new_polling:1;
157 	unsigned		wireless:1;	/* Wireless USB HCD */
158 	unsigned		has_tt:1;	/* Integrated TT in root hub */
159 	unsigned		amd_resume_bug:1; /* AMD remote wakeup quirk */
160 	unsigned		can_do_streams:1; /* HC supports streams */
161 	unsigned		tpl_support:1; /* OTG & EH TPL support */
162 	unsigned		cant_recv_wakeups:1;
163 			/* wakeup requests from downstream aren't received */
164 
165 	unsigned int		irq;		/* irq allocated */
166 	void __iomem		*regs;		/* device memory/io */
167 	resource_size_t		rsrc_start;	/* memory/io resource start */
168 	resource_size_t		rsrc_len;	/* memory/io resource length */
169 	unsigned		power_budget;	/* in mA, 0 = no limit */
170 
171 	struct giveback_urb_bh  high_prio_bh;
172 	struct giveback_urb_bh  low_prio_bh;
173 
174 	/* bandwidth_mutex should be taken before adding or removing
175 	 * any new bus bandwidth constraints:
176 	 *   1. Before adding a configuration for a new device.
177 	 *   2. Before removing the configuration to put the device into
178 	 *      the addressed state.
179 	 *   3. Before selecting a different configuration.
180 	 *   4. Before selecting an alternate interface setting.
181 	 *
182 	 * bandwidth_mutex should be dropped after a successful control message
183 	 * to the device, or resetting the bandwidth after a failed attempt.
184 	 */
185 	struct mutex		*address0_mutex;
186 	struct mutex		*bandwidth_mutex;
187 	struct usb_hcd		*shared_hcd;
188 	struct usb_hcd		*primary_hcd;
189 
190 
191 #define HCD_BUFFER_POOLS	4
192 	struct dma_pool		*pool[HCD_BUFFER_POOLS];
193 
194 	int			state;
195 #	define	__ACTIVE		0x01
196 #	define	__SUSPEND		0x04
197 #	define	__TRANSIENT		0x80
198 
199 #	define	HC_STATE_HALT		0
200 #	define	HC_STATE_RUNNING	(__ACTIVE)
201 #	define	HC_STATE_QUIESCING	(__SUSPEND|__TRANSIENT|__ACTIVE)
202 #	define	HC_STATE_RESUMING	(__SUSPEND|__TRANSIENT)
203 #	define	HC_STATE_SUSPENDED	(__SUSPEND)
204 
205 #define	HC_IS_RUNNING(state) ((state) & __ACTIVE)
206 #define	HC_IS_SUSPENDED(state) ((state) & __SUSPEND)
207 
208 	/* memory pool for HCs having local memory, or %NULL */
209 	struct gen_pool         *localmem_pool;
210 
211 	/* more shared queuing code would be good; it should support
212 	 * smarter scheduling, handle transaction translators, etc;
213 	 * input size of periodic table to an interrupt scheduler.
214 	 * (ohci 32, uhci 1024, ehci 256/512/1024).
215 	 */
216 
217 	/* The HC driver's private data is stored at the end of
218 	 * this structure.
219 	 */
220 	unsigned long hcd_priv[]
221 			__attribute__ ((aligned(sizeof(s64))));
222 };
223 
224 /* 2.4 does this a bit differently ... */
hcd_to_bus(struct usb_hcd * hcd)225 static inline struct usb_bus *hcd_to_bus(struct usb_hcd *hcd)
226 {
227 	return &hcd->self;
228 }
229 
bus_to_hcd(struct usb_bus * bus)230 static inline struct usb_hcd *bus_to_hcd(struct usb_bus *bus)
231 {
232 	return container_of(bus, struct usb_hcd, self);
233 }
234 
235 /*-------------------------------------------------------------------------*/
236 
237 
238 struct hc_driver {
239 	const char	*description;	/* "ehci-hcd" etc */
240 	const char	*product_desc;	/* product/vendor string */
241 	size_t		hcd_priv_size;	/* size of private data */
242 
243 	/* irq handler */
244 	irqreturn_t	(*irq) (struct usb_hcd *hcd);
245 
246 	int	flags;
247 #define	HCD_MEMORY	0x0001		/* HC regs use memory (else I/O) */
248 #define	HCD_DMA		0x0002		/* HC uses DMA */
249 #define	HCD_SHARED	0x0004		/* Two (or more) usb_hcds share HW */
250 #define	HCD_USB11	0x0010		/* USB 1.1 */
251 #define	HCD_USB2	0x0020		/* USB 2.0 */
252 #define	HCD_USB25	0x0030		/* Wireless USB 1.0 (USB 2.5)*/
253 #define	HCD_USB3	0x0040		/* USB 3.0 */
254 #define	HCD_USB31	0x0050		/* USB 3.1 */
255 #define	HCD_USB32	0x0060		/* USB 3.2 */
256 #define	HCD_MASK	0x0070
257 #define	HCD_BH		0x0100		/* URB complete in BH context */
258 
259 	/* called to init HCD and root hub */
260 	int	(*reset) (struct usb_hcd *hcd);
261 	int	(*start) (struct usb_hcd *hcd);
262 
263 	/* NOTE:  these suspend/resume calls relate to the HC as
264 	 * a whole, not just the root hub; they're for PCI bus glue.
265 	 */
266 	/* called after suspending the hub, before entering D3 etc */
267 	int	(*pci_suspend)(struct usb_hcd *hcd, bool do_wakeup);
268 
269 	/* called after entering D0 (etc), before resuming the hub */
270 	int	(*pci_resume)(struct usb_hcd *hcd, bool hibernated);
271 
272 	/* cleanly make HCD stop writing memory and doing I/O */
273 	void	(*stop) (struct usb_hcd *hcd);
274 
275 	/* shutdown HCD */
276 	void	(*shutdown) (struct usb_hcd *hcd);
277 
278 	/* return current frame number */
279 	int	(*get_frame_number) (struct usb_hcd *hcd);
280 
281 	/* manage i/o requests, device state */
282 	int	(*urb_enqueue)(struct usb_hcd *hcd,
283 				struct urb *urb, gfp_t mem_flags);
284 	int	(*urb_dequeue)(struct usb_hcd *hcd,
285 				struct urb *urb, int status);
286 
287 	/*
288 	 * (optional) these hooks allow an HCD to override the default DMA
289 	 * mapping and unmapping routines.  In general, they shouldn't be
290 	 * necessary unless the host controller has special DMA requirements,
291 	 * such as alignment constraints.  If these are not specified, the
292 	 * general usb_hcd_(un)?map_urb_for_dma functions will be used instead
293 	 * (and it may be a good idea to call these functions in your HCD
294 	 * implementation)
295 	 */
296 	int	(*map_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb,
297 				   gfp_t mem_flags);
298 	void    (*unmap_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb);
299 
300 	/* hw synch, freeing endpoint resources that urb_dequeue can't */
301 	void	(*endpoint_disable)(struct usb_hcd *hcd,
302 			struct usb_host_endpoint *ep);
303 
304 	/* (optional) reset any endpoint state such as sequence number
305 	   and current window */
306 	void	(*endpoint_reset)(struct usb_hcd *hcd,
307 			struct usb_host_endpoint *ep);
308 
309 	/* root hub support */
310 	int	(*hub_status_data) (struct usb_hcd *hcd, char *buf);
311 	int	(*hub_control) (struct usb_hcd *hcd,
312 				u16 typeReq, u16 wValue, u16 wIndex,
313 				char *buf, u16 wLength);
314 	int	(*bus_suspend)(struct usb_hcd *);
315 	int	(*bus_resume)(struct usb_hcd *);
316 	int	(*start_port_reset)(struct usb_hcd *, unsigned port_num);
317 	unsigned long	(*get_resuming_ports)(struct usb_hcd *);
318 
319 		/* force handover of high-speed port to full-speed companion */
320 	void	(*relinquish_port)(struct usb_hcd *, int);
321 		/* has a port been handed over to a companion? */
322 	int	(*port_handed_over)(struct usb_hcd *, int);
323 
324 		/* CLEAR_TT_BUFFER completion callback */
325 	void	(*clear_tt_buffer_complete)(struct usb_hcd *,
326 				struct usb_host_endpoint *);
327 
328 	/* xHCI specific functions */
329 		/* Called by usb_alloc_dev to alloc HC device structures */
330 	int	(*alloc_dev)(struct usb_hcd *, struct usb_device *);
331 		/* Called by usb_disconnect to free HC device structures */
332 	void	(*free_dev)(struct usb_hcd *, struct usb_device *);
333 	/* Change a group of bulk endpoints to support multiple stream IDs */
334 	int	(*alloc_streams)(struct usb_hcd *hcd, struct usb_device *udev,
335 		struct usb_host_endpoint **eps, unsigned int num_eps,
336 		unsigned int num_streams, gfp_t mem_flags);
337 	/* Reverts a group of bulk endpoints back to not using stream IDs.
338 	 * Can fail if we run out of memory.
339 	 */
340 	int	(*free_streams)(struct usb_hcd *hcd, struct usb_device *udev,
341 		struct usb_host_endpoint **eps, unsigned int num_eps,
342 		gfp_t mem_flags);
343 
344 	/* Bandwidth computation functions */
345 	/* Note that add_endpoint() can only be called once per endpoint before
346 	 * check_bandwidth() or reset_bandwidth() must be called.
347 	 * drop_endpoint() can only be called once per endpoint also.
348 	 * A call to xhci_drop_endpoint() followed by a call to
349 	 * xhci_add_endpoint() will add the endpoint to the schedule with
350 	 * possibly new parameters denoted by a different endpoint descriptor
351 	 * in usb_host_endpoint.  A call to xhci_add_endpoint() followed by a
352 	 * call to xhci_drop_endpoint() is not allowed.
353 	 */
354 		/* Allocate endpoint resources and add them to a new schedule */
355 	int	(*add_endpoint)(struct usb_hcd *, struct usb_device *,
356 				struct usb_host_endpoint *);
357 		/* Drop an endpoint from a new schedule */
358 	int	(*drop_endpoint)(struct usb_hcd *, struct usb_device *,
359 				 struct usb_host_endpoint *);
360 		/* Check that a new hardware configuration, set using
361 		 * endpoint_enable and endpoint_disable, does not exceed bus
362 		 * bandwidth.  This must be called before any set configuration
363 		 * or set interface requests are sent to the device.
364 		 */
365 	int	(*check_bandwidth)(struct usb_hcd *, struct usb_device *);
366 		/* Reset the device schedule to the last known good schedule,
367 		 * which was set from a previous successful call to
368 		 * check_bandwidth().  This reverts any add_endpoint() and
369 		 * drop_endpoint() calls since that last successful call.
370 		 * Used for when a check_bandwidth() call fails due to resource
371 		 * or bandwidth constraints.
372 		 */
373 	void	(*reset_bandwidth)(struct usb_hcd *, struct usb_device *);
374 		/* Returns the hardware-chosen device address */
375 	int	(*address_device)(struct usb_hcd *, struct usb_device *udev);
376 		/* prepares the hardware to send commands to the device */
377 	int	(*enable_device)(struct usb_hcd *, struct usb_device *udev);
378 		/* Notifies the HCD after a hub descriptor is fetched.
379 		 * Will block.
380 		 */
381 	int	(*update_hub_device)(struct usb_hcd *, struct usb_device *hdev,
382 			struct usb_tt *tt, gfp_t mem_flags);
383 	int	(*reset_device)(struct usb_hcd *, struct usb_device *);
384 		/* Notifies the HCD after a device is connected and its
385 		 * address is set
386 		 */
387 	int	(*update_device)(struct usb_hcd *, struct usb_device *);
388 	int	(*set_usb2_hw_lpm)(struct usb_hcd *, struct usb_device *, int);
389 	/* USB 3.0 Link Power Management */
390 		/* Returns the USB3 hub-encoded value for the U1/U2 timeout. */
391 	int	(*enable_usb3_lpm_timeout)(struct usb_hcd *,
392 			struct usb_device *, enum usb3_link_state state);
393 		/* The xHCI host controller can still fail the command to
394 		 * disable the LPM timeouts, so this can return an error code.
395 		 */
396 	int	(*disable_usb3_lpm_timeout)(struct usb_hcd *,
397 			struct usb_device *, enum usb3_link_state state);
398 	int	(*find_raw_port_number)(struct usb_hcd *, int);
399 	/* Call for power on/off the port if necessary */
400 	int	(*port_power)(struct usb_hcd *hcd, int portnum, bool enable);
401 	/* Call for SINGLE_STEP_SET_FEATURE Test for USB2 EH certification */
402 #define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
403 	int	(*submit_single_step_set_feature)(struct usb_hcd *,
404 			struct urb *, int);
405 };
406 
hcd_giveback_urb_in_bh(struct usb_hcd * hcd)407 static inline int hcd_giveback_urb_in_bh(struct usb_hcd *hcd)
408 {
409 	return hcd->driver->flags & HCD_BH;
410 }
411 
hcd_periodic_completion_in_progress(struct usb_hcd * hcd,struct usb_host_endpoint * ep)412 static inline bool hcd_periodic_completion_in_progress(struct usb_hcd *hcd,
413 		struct usb_host_endpoint *ep)
414 {
415 	return hcd->high_prio_bh.completing_ep == ep;
416 }
417 
hcd_uses_dma(struct usb_hcd * hcd)418 static inline bool hcd_uses_dma(struct usb_hcd *hcd)
419 {
420 	return IS_ENABLED(CONFIG_HAS_DMA) && (hcd->driver->flags & HCD_DMA);
421 }
422 
423 extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
424 extern int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
425 		int status);
426 extern void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb);
427 
428 extern int usb_hcd_submit_urb(struct urb *urb, gfp_t mem_flags);
429 extern int usb_hcd_unlink_urb(struct urb *urb, int status);
430 extern void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb,
431 		int status);
432 extern int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
433 		gfp_t mem_flags);
434 extern void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *, struct urb *);
435 extern void usb_hcd_unmap_urb_for_dma(struct usb_hcd *, struct urb *);
436 extern void usb_hcd_flush_endpoint(struct usb_device *udev,
437 		struct usb_host_endpoint *ep);
438 extern void usb_hcd_disable_endpoint(struct usb_device *udev,
439 		struct usb_host_endpoint *ep);
440 extern void usb_hcd_reset_endpoint(struct usb_device *udev,
441 		struct usb_host_endpoint *ep);
442 extern void usb_hcd_synchronize_unlinks(struct usb_device *udev);
443 extern int usb_hcd_alloc_bandwidth(struct usb_device *udev,
444 		struct usb_host_config *new_config,
445 		struct usb_host_interface *old_alt,
446 		struct usb_host_interface *new_alt);
447 extern int usb_hcd_get_frame_number(struct usb_device *udev);
448 
449 struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver,
450 		struct device *sysdev, struct device *dev, const char *bus_name,
451 		struct usb_hcd *primary_hcd);
452 extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
453 		struct device *dev, const char *bus_name);
454 extern struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
455 		struct device *dev, const char *bus_name,
456 		struct usb_hcd *shared_hcd);
457 extern struct usb_hcd *usb_get_hcd(struct usb_hcd *hcd);
458 extern void usb_put_hcd(struct usb_hcd *hcd);
459 extern int usb_hcd_is_primary_hcd(struct usb_hcd *hcd);
460 extern int usb_add_hcd(struct usb_hcd *hcd,
461 		unsigned int irqnum, unsigned long irqflags);
462 extern void usb_remove_hcd(struct usb_hcd *hcd);
463 extern int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1);
464 int usb_hcd_setup_local_mem(struct usb_hcd *hcd, phys_addr_t phys_addr,
465 			    dma_addr_t dma, size_t size);
466 
467 struct platform_device;
468 extern void usb_hcd_platform_shutdown(struct platform_device *dev);
469 #ifdef CONFIG_USB_HCD_TEST_MODE
470 extern int ehset_single_step_set_feature(struct usb_hcd *hcd, int port);
471 #else
ehset_single_step_set_feature(struct usb_hcd * hcd,int port)472 static inline int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
473 {
474 	return 0;
475 }
476 #endif /* CONFIG_USB_HCD_TEST_MODE */
477 
478 #ifdef CONFIG_USB_PCI
479 struct pci_dev;
480 struct pci_device_id;
481 extern int usb_hcd_pci_probe(struct pci_dev *dev,
482 			     const struct hc_driver *driver);
483 extern void usb_hcd_pci_remove(struct pci_dev *dev);
484 extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
485 
486 extern int usb_hcd_amd_remote_wakeup_quirk(struct pci_dev *dev);
487 
488 #ifdef CONFIG_PM
489 extern const struct dev_pm_ops usb_hcd_pci_pm_ops;
490 #endif
491 #endif /* CONFIG_USB_PCI */
492 
493 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
494 void usb_init_pool_max(void);
495 int hcd_buffer_create(struct usb_hcd *hcd);
496 void hcd_buffer_destroy(struct usb_hcd *hcd);
497 
498 void *hcd_buffer_alloc(struct usb_bus *bus, size_t size,
499 	gfp_t mem_flags, dma_addr_t *dma);
500 void hcd_buffer_free(struct usb_bus *bus, size_t size,
501 	void *addr, dma_addr_t dma);
502 
503 /* generic bus glue, needed for host controllers that don't use PCI */
504 extern irqreturn_t usb_hcd_irq(int irq, void *__hcd);
505 
506 extern void usb_hc_died(struct usb_hcd *hcd);
507 extern void usb_hcd_poll_rh_status(struct usb_hcd *hcd);
508 extern void usb_wakeup_notification(struct usb_device *hdev,
509 		unsigned int portnum);
510 
511 extern void usb_hcd_start_port_resume(struct usb_bus *bus, int portnum);
512 extern void usb_hcd_end_port_resume(struct usb_bus *bus, int portnum);
513 
514 /* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
515 #define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
516 #define	usb_dotoggle(dev, ep, out)  ((dev)->toggle[out] ^= (1 << (ep)))
517 #define usb_settoggle(dev, ep, out, bit) \
518 		((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | \
519 		 ((bit) << (ep)))
520 
521 /* -------------------------------------------------------------------------- */
522 
523 /* Enumeration is only for the hub driver, or HCD virtual root hubs */
524 extern struct usb_device *usb_alloc_dev(struct usb_device *parent,
525 					struct usb_bus *, unsigned port);
526 extern int usb_new_device(struct usb_device *dev);
527 extern void usb_disconnect(struct usb_device **);
528 
529 extern int usb_get_configuration(struct usb_device *dev);
530 extern void usb_destroy_configuration(struct usb_device *dev);
531 
532 /*-------------------------------------------------------------------------*/
533 
534 /*
535  * HCD Root Hub support
536  */
537 
538 #include <linux/usb/ch11.h>
539 
540 /*
541  * As of USB 2.0, full/low speed devices are segregated into trees.
542  * One type grows from USB 1.1 host controllers (OHCI, UHCI etc).
543  * The other type grows from high speed hubs when they connect to
544  * full/low speed devices using "Transaction Translators" (TTs).
545  *
546  * TTs should only be known to the hub driver, and high speed bus
547  * drivers (only EHCI for now).  They affect periodic scheduling and
548  * sometimes control/bulk error recovery.
549  */
550 
551 struct usb_device;
552 
553 struct usb_tt {
554 	struct usb_device	*hub;	/* upstream highspeed hub */
555 	int			multi;	/* true means one TT per port */
556 	unsigned		think_time;	/* think time in ns */
557 	void			*hcpriv;	/* HCD private data */
558 
559 	/* for control/bulk error recovery (CLEAR_TT_BUFFER) */
560 	spinlock_t		lock;
561 	struct list_head	clear_list;	/* of usb_tt_clear */
562 	struct work_struct	clear_work;
563 };
564 
565 struct usb_tt_clear {
566 	struct list_head	clear_list;
567 	unsigned		tt;
568 	u16			devinfo;
569 	struct usb_hcd		*hcd;
570 	struct usb_host_endpoint	*ep;
571 };
572 
573 extern int usb_hub_clear_tt_buffer(struct urb *urb);
574 extern void usb_ep0_reinit(struct usb_device *);
575 
576 /* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
577 #define DeviceRequest \
578 	((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
579 #define DeviceOutRequest \
580 	((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
581 
582 #define InterfaceRequest \
583 	((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
584 
585 #define EndpointRequest \
586 	((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT)<<8)
587 #define EndpointOutRequest \
588 	((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT)<<8)
589 
590 /* class requests from the USB 2.0 hub spec, table 11-15 */
591 #define HUB_CLASS_REQ(dir, type, request) ((((dir) | (type)) << 8) | (request))
592 /* GetBusState and SetHubDescriptor are optional, omitted */
593 #define ClearHubFeature		HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_HUB, USB_REQ_CLEAR_FEATURE)
594 #define ClearPortFeature	HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_PORT, USB_REQ_CLEAR_FEATURE)
595 #define GetHubDescriptor	HUB_CLASS_REQ(USB_DIR_IN, USB_RT_HUB, USB_REQ_GET_DESCRIPTOR)
596 #define GetHubStatus		HUB_CLASS_REQ(USB_DIR_IN, USB_RT_HUB, USB_REQ_GET_STATUS)
597 #define GetPortStatus		HUB_CLASS_REQ(USB_DIR_IN, USB_RT_PORT, USB_REQ_GET_STATUS)
598 #define SetHubFeature		HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_HUB, USB_REQ_SET_FEATURE)
599 #define SetPortFeature		HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_PORT, USB_REQ_SET_FEATURE)
600 #define ClearTTBuffer		HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_PORT, HUB_CLEAR_TT_BUFFER)
601 #define ResetTT			HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_PORT, HUB_RESET_TT)
602 #define GetTTState		HUB_CLASS_REQ(USB_DIR_IN, USB_RT_PORT, HUB_GET_TT_STATE)
603 #define StopTT			HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_PORT, HUB_STOP_TT)
604 
605 
606 /*-------------------------------------------------------------------------*/
607 
608 /* class requests from USB 3.1 hub spec, table 10-7 */
609 #define SetHubDepth		HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_HUB, HUB_SET_DEPTH)
610 #define GetPortErrorCount	HUB_CLASS_REQ(USB_DIR_IN, USB_RT_PORT, HUB_GET_PORT_ERR_COUNT)
611 
612 /*
613  * Generic bandwidth allocation constants/support
614  */
615 #define FRAME_TIME_USECS	1000L
616 #define BitTime(bytecount) (7 * 8 * bytecount / 6) /* with integer truncation */
617 		/* Trying not to use worst-case bit-stuffing
618 		 * of (7/6 * 8 * bytecount) = 9.33 * bytecount */
619 		/* bytecount = data payload byte count */
620 
621 #define NS_TO_US(ns)	DIV_ROUND_UP(ns, 1000L)
622 			/* convert nanoseconds to microseconds, rounding up */
623 
624 /*
625  * Full/low speed bandwidth allocation constants/support.
626  */
627 #define BW_HOST_DELAY	1000L		/* nanoseconds */
628 #define BW_HUB_LS_SETUP	333L		/* nanoseconds */
629 			/* 4 full-speed bit times (est.) */
630 
631 #define FRAME_TIME_BITS			12000L	/* frame = 1 millisecond */
632 #define FRAME_TIME_MAX_BITS_ALLOC	(90L * FRAME_TIME_BITS / 100L)
633 #define FRAME_TIME_MAX_USECS_ALLOC	(90L * FRAME_TIME_USECS / 100L)
634 
635 /*
636  * Ceiling [nano/micro]seconds (typical) for that many bytes at high speed
637  * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
638  * to preallocate bandwidth)
639  */
640 #define USB2_HOST_DELAY	5	/* nsec, guess */
641 #define HS_NSECS(bytes) (((55 * 8 * 2083) \
642 	+ (2083UL * (3 + BitTime(bytes))))/1000 \
643 	+ USB2_HOST_DELAY)
644 #define HS_NSECS_ISO(bytes) (((38 * 8 * 2083) \
645 	+ (2083UL * (3 + BitTime(bytes))))/1000 \
646 	+ USB2_HOST_DELAY)
647 #define HS_USECS(bytes)		NS_TO_US(HS_NSECS(bytes))
648 #define HS_USECS_ISO(bytes)	NS_TO_US(HS_NSECS_ISO(bytes))
649 
650 extern long usb_calc_bus_time(int speed, int is_input,
651 			int isoc, int bytecount);
652 
653 /*-------------------------------------------------------------------------*/
654 
655 extern void usb_set_device_state(struct usb_device *udev,
656 		enum usb_device_state new_state);
657 
658 /*-------------------------------------------------------------------------*/
659 
660 /* exported only within usbcore */
661 
662 extern struct idr usb_bus_idr;
663 extern struct mutex usb_bus_idr_lock;
664 extern wait_queue_head_t usb_kill_urb_queue;
665 
666 
667 #define usb_endpoint_out(ep_dir)	(!((ep_dir) & USB_DIR_IN))
668 
669 #ifdef CONFIG_PM
670 extern unsigned usb_wakeup_enabled_descendants(struct usb_device *udev);
671 extern void usb_root_hub_lost_power(struct usb_device *rhdev);
672 extern int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg);
673 extern int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg);
674 extern void usb_hcd_resume_root_hub(struct usb_hcd *hcd);
675 #else
usb_wakeup_enabled_descendants(struct usb_device * udev)676 static inline unsigned usb_wakeup_enabled_descendants(struct usb_device *udev)
677 {
678 	return 0;
679 }
usb_hcd_resume_root_hub(struct usb_hcd * hcd)680 static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
681 {
682 	return;
683 }
684 #endif /* CONFIG_PM */
685 
686 /*-------------------------------------------------------------------------*/
687 
688 #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
689 
690 struct usb_mon_operations {
691 	void (*urb_submit)(struct usb_bus *bus, struct urb *urb);
692 	void (*urb_submit_error)(struct usb_bus *bus, struct urb *urb, int err);
693 	void (*urb_complete)(struct usb_bus *bus, struct urb *urb, int status);
694 	/* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
695 };
696 
697 extern const struct usb_mon_operations *mon_ops;
698 
usbmon_urb_submit(struct usb_bus * bus,struct urb * urb)699 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb)
700 {
701 	if (bus->monitored)
702 		(*mon_ops->urb_submit)(bus, urb);
703 }
704 
usbmon_urb_submit_error(struct usb_bus * bus,struct urb * urb,int error)705 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
706     int error)
707 {
708 	if (bus->monitored)
709 		(*mon_ops->urb_submit_error)(bus, urb, error);
710 }
711 
usbmon_urb_complete(struct usb_bus * bus,struct urb * urb,int status)712 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
713 		int status)
714 {
715 	if (bus->monitored)
716 		(*mon_ops->urb_complete)(bus, urb, status);
717 }
718 
719 int usb_mon_register(const struct usb_mon_operations *ops);
720 void usb_mon_deregister(void);
721 
722 #else
723 
usbmon_urb_submit(struct usb_bus * bus,struct urb * urb)724 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb) {}
usbmon_urb_submit_error(struct usb_bus * bus,struct urb * urb,int error)725 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
726     int error) {}
usbmon_urb_complete(struct usb_bus * bus,struct urb * urb,int status)727 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
728 		int status) {}
729 
730 #endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
731 
732 /*-------------------------------------------------------------------------*/
733 
734 /* random stuff */
735 
736 /* This rwsem is for use only by the hub driver and ehci-hcd.
737  * Nobody else should touch it.
738  */
739 extern struct rw_semaphore ehci_cf_port_reset_rwsem;
740 
741 /* Keep track of which host controller drivers are loaded */
742 #define USB_UHCI_LOADED		0
743 #define USB_OHCI_LOADED		1
744 #define USB_EHCI_LOADED		2
745 extern unsigned long usb_hcds_loaded;
746 
747 #endif /* __KERNEL__ */
748 
749 #endif /* __USB_CORE_HCD_H */
750