2 * Copyright (c) 2001-2002 by David Brownell
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software Foundation,
16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 /* This file contains declarations of usbcore internals that are mostly
23 * used or exposed by Host Controller Drivers.
27 * USB Packet IDs (PIDs)
29 #define USB_PID_UNDEF_0 0xf0
30 #define USB_PID_OUT 0xe1
31 #define USB_PID_ACK 0xd2
32 #define USB_PID_DATA0 0xc3
33 #define USB_PID_PING 0xb4 /* USB 2.0 */
34 #define USB_PID_SOF 0xa5
35 #define USB_PID_NYET 0x96 /* USB 2.0 */
36 #define USB_PID_DATA2 0x87 /* USB 2.0 */
37 #define USB_PID_SPLIT 0x78 /* USB 2.0 */
38 #define USB_PID_IN 0x69
39 #define USB_PID_NAK 0x5a
40 #define USB_PID_DATA1 0x4b
41 #define USB_PID_PREAMBLE 0x3c /* Token mode */
42 #define USB_PID_ERR 0x3c /* USB 2.0: handshake mode */
43 #define USB_PID_SETUP 0x2d
44 #define USB_PID_STALL 0x1e
45 #define USB_PID_MDATA 0x0f /* USB 2.0 */
47 /*-------------------------------------------------------------------------*/
50 * USB Host Controller Driver (usb_hcd) framework
52 * Since "struct usb_bus" is so thin, you can't share much code in it.
53 * This framework is a layer over that, and should be more sharable.
56 /*-------------------------------------------------------------------------*/
58 struct usb_hcd { /* usb_bus.hcpriv points to this */
63 struct usb_bus self; /* hcd is-a bus */
65 const char *product_desc; /* product/vendor string */
66 const char *description; /* "ehci-hcd" etc */
68 struct timer_list rh_timer; /* drives root hub */
69 struct list_head dev_list; /* devices on this bus */
70 struct work_struct work;
75 struct hc_driver *driver; /* hw-specific hooks */
77 unsigned can_wakeup:1; /* hw supports wakeup? */
78 unsigned remote_wakeup:1;/* sw should use wakeup? */
79 int irq; /* irq allocated */
80 void *regs; /* device memory/io */
83 int region; /* pci region for regs */
84 u32 pci_state [16]; /* for PM state save */
87 #define HCD_BUFFER_POOLS 4
88 struct dma_pool *pool [HCD_BUFFER_POOLS];
91 # define __ACTIVE 0x01
92 # define __SUSPEND 0x04
93 # define __TRANSIENT 0x80
95 # define USB_STATE_HALT 0
96 # define USB_STATE_RUNNING (__ACTIVE)
97 # define USB_STATE_QUIESCING (__SUSPEND|__TRANSIENT|__ACTIVE)
98 # define USB_STATE_RESUMING (__SUSPEND|__TRANSIENT)
99 # define HCD_STATE_SUSPENDED (__SUSPEND)
101 #define HCD_IS_RUNNING(state) ((state) & __ACTIVE)
102 #define HCD_IS_SUSPENDED(state) ((state) & __SUSPEND)
104 /* more shared queuing code would be good; it should support
105 * smarter scheduling, handle transaction translators, etc;
106 * input size of periodic table to an interrupt scheduler.
107 * (ohci 32, uhci 1024, ehci 256/512/1024).
111 /* 2.4 does this a bit differently ... */
112 static inline struct usb_bus *hcd_to_bus (struct usb_hcd *hcd)
118 struct hcd_dev { /* usb_device.hcpriv points to this */
119 struct list_head dev_list; /* on this hcd */
120 struct list_head urb_list; /* pending on this dev */
122 /* per-configuration HC/HCD state, such as QH or ED */
126 // urb.hcpriv is really hardware-specific
128 struct hcd_timeout { /* timeouts we allocate */
129 struct list_head timeout_list;
130 struct timer_list timer;
133 /*-------------------------------------------------------------------------*/
136 * FIXME usb_operations should vanish or become hc_driver,
137 * when usb_bus and usb_hcd become the same thing.
140 struct usb_operations {
141 int (*allocate)(struct usb_device *);
142 int (*deallocate)(struct usb_device *);
143 int (*get_frame_number) (struct usb_device *usb_dev);
144 int (*submit_urb) (struct urb *urb, int mem_flags);
145 int (*unlink_urb) (struct urb *urb);
147 /* allocate dma-consistent buffer for URB_DMA_NOMAPPING */
148 void *(*buffer_alloc)(struct usb_bus *bus, size_t size,
151 void (*buffer_free)(struct usb_bus *bus, size_t size,
152 void *addr, dma_addr_t dma);
154 void (*disable)(struct usb_device *udev, int bEndpointAddress);
157 /* each driver provides one of these, and hardware init support */
162 const char *description; /* "ehci-hcd" etc */
165 irqreturn_t (*irq) (struct usb_hcd *hcd, struct pt_regs *regs);
168 #define HCD_MEMORY 0x0001 /* HC regs use memory (else I/O) */
169 #define HCD_USB11 0x0010 /* USB 1.1 */
170 #define HCD_USB2 0x0020 /* USB 2.0 */
172 /* called to init HCD and root hub */
173 int (*reset) (struct usb_hcd *hcd);
174 int (*start) (struct usb_hcd *hcd);
176 /* called after all devices were suspended */
177 int (*suspend) (struct usb_hcd *hcd, u32 state);
179 /* called before any devices get resumed */
180 int (*resume) (struct usb_hcd *hcd);
182 /* cleanly make HCD stop writing memory and doing I/O */
183 void (*stop) (struct usb_hcd *hcd);
185 /* return current frame number */
186 int (*get_frame_number) (struct usb_hcd *hcd);
188 /* memory lifecycle */
189 struct usb_hcd *(*hcd_alloc) (void);
190 void (*hcd_free) (struct usb_hcd *hcd);
192 /* manage i/o requests, device state */
193 int (*urb_enqueue) (struct usb_hcd *hcd, struct urb *urb,
195 int (*urb_dequeue) (struct usb_hcd *hcd, struct urb *urb);
197 /* hw synch, freeing endpoint resources that urb_dequeue can't */
198 void (*endpoint_disable)(struct usb_hcd *hcd,
199 struct hcd_dev *dev, int bEndpointAddress);
201 /* root hub support */
202 int (*hub_status_data) (struct usb_hcd *hcd, char *buf);
203 int (*hub_control) (struct usb_hcd *hcd,
204 u16 typeReq, u16 wValue, u16 wIndex,
205 char *buf, u16 wLength);
208 extern void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs);
209 extern void usb_bus_init (struct usb_bus *bus);
210 extern void usb_rh_status_dequeue (struct usb_hcd *hcd, struct urb *urb);
214 struct pci_device_id;
215 extern int usb_hcd_pci_probe (struct pci_dev *dev,
216 const struct pci_device_id *id);
217 extern void usb_hcd_pci_remove (struct pci_dev *dev);
220 extern int usb_hcd_pci_suspend (struct pci_dev *dev, u32 state);
221 extern int usb_hcd_pci_resume (struct pci_dev *dev);
222 #endif /* CONFIG_PM */
224 #endif /* CONFIG_PCI */
226 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
227 int hcd_buffer_create (struct usb_hcd *hcd);
228 void hcd_buffer_destroy (struct usb_hcd *hcd);
230 void *hcd_buffer_alloc (struct usb_bus *bus, size_t size,
231 int mem_flags, dma_addr_t *dma);
232 void hcd_buffer_free (struct usb_bus *bus, size_t size,
233 void *addr, dma_addr_t dma);
235 /* generic bus glue, needed for host controllers that don't use PCI */
236 extern struct usb_operations usb_hcd_operations;
237 extern irqreturn_t usb_hcd_irq (int irq, void *__hcd, struct pt_regs *r);
238 extern void usb_hc_died (struct usb_hcd *hcd);
240 /* -------------------------------------------------------------------------- */
242 /* Enumeration is only for the hub driver, or HCD virtual root hubs */
243 extern struct usb_device *usb_alloc_dev(struct usb_device *parent,
244 struct usb_bus *, unsigned port);
245 extern int usb_new_device(struct usb_device *dev);
246 extern void usb_disconnect(struct usb_device **);
248 extern int usb_get_configuration(struct usb_device *dev);
249 extern void usb_destroy_configuration(struct usb_device *dev);
251 /*-------------------------------------------------------------------------*/
254 * HCD Root Hub support
259 /* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
260 #define DeviceRequest \
261 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
262 #define DeviceOutRequest \
263 ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
265 #define InterfaceRequest \
266 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
268 #define EndpointRequest \
269 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
270 #define EndpointOutRequest \
271 ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
273 /* class requests from the USB 2.0 hub spec, table 11-15 */
274 /* GetBusState and SetHubDescriptor are optional, omitted */
275 #define ClearHubFeature (0x2000 | USB_REQ_CLEAR_FEATURE)
276 #define ClearPortFeature (0x2300 | USB_REQ_CLEAR_FEATURE)
277 #define GetHubDescriptor (0xa000 | USB_REQ_GET_DESCRIPTOR)
278 #define GetHubStatus (0xa000 | USB_REQ_GET_STATUS)
279 #define GetPortStatus (0xa300 | USB_REQ_GET_STATUS)
280 #define SetHubFeature (0x2000 | USB_REQ_SET_FEATURE)
281 #define SetPortFeature (0x2300 | USB_REQ_SET_FEATURE)
284 /*-------------------------------------------------------------------------*/
287 * Generic bandwidth allocation constants/support
289 #define FRAME_TIME_USECS 1000L
290 #define BitTime(bytecount) (7 * 8 * bytecount / 6) /* with integer truncation */
291 /* Trying not to use worst-case bit-stuffing
292 of (7/6 * 8 * bytecount) = 9.33 * bytecount */
293 /* bytecount = data payload byte count */
295 #define NS_TO_US(ns) ((ns + 500L) / 1000L)
296 /* convert & round nanoseconds to microseconds */
298 extern void usb_claim_bandwidth (struct usb_device *dev, struct urb *urb,
299 int bustime, int isoc);
300 extern void usb_release_bandwidth (struct usb_device *dev, struct urb *urb,
304 * Full/low speed bandwidth allocation constants/support.
306 #define BW_HOST_DELAY 1000L /* nanoseconds */
307 #define BW_HUB_LS_SETUP 333L /* nanoseconds */
308 /* 4 full-speed bit times (est.) */
310 #define FRAME_TIME_BITS 12000L /* frame = 1 millisecond */
311 #define FRAME_TIME_MAX_BITS_ALLOC (90L * FRAME_TIME_BITS / 100L)
312 #define FRAME_TIME_MAX_USECS_ALLOC (90L * FRAME_TIME_USECS / 100L)
314 extern int usb_check_bandwidth (struct usb_device *dev, struct urb *urb);
317 * Ceiling microseconds (typical) for that many bytes at high speed
318 * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
319 * to preallocate bandwidth)
321 #define USB2_HOST_DELAY 5 /* nsec, guess */
322 #define HS_USECS(bytes) NS_TO_US ( ((55 * 8 * 2083)/1000) \
323 + ((2083UL * (3167 + BitTime (bytes)))/1000) \
325 #define HS_USECS_ISO(bytes) NS_TO_US ( ((38 * 8 * 2083)/1000) \
326 + ((2083UL * (3167 + BitTime (bytes)))/1000) \
329 extern long usb_calc_bus_time (int speed, int is_input,
330 int isoc, int bytecount);
332 /*-------------------------------------------------------------------------*/
334 extern struct usb_bus *usb_alloc_bus (struct usb_operations *);
336 extern int usb_register_bus (struct usb_bus *);
337 extern void usb_deregister_bus (struct usb_bus *);
339 extern int usb_register_root_hub (struct usb_device *usb_dev,
340 struct device *parent_dev);
342 static inline int hcd_register_root (struct usb_device *usb_dev,
345 /* hcd->driver->start() reported can_wakeup, probably with
346 * assistance from board's boot firmware.
347 * NOTE: normal devices won't enable wakeup by default.
350 dev_dbg (hcd->self.controller, "supports USB remote wakeup\n");
351 hcd->remote_wakeup = hcd->can_wakeup;
353 return usb_register_root_hub (usb_dev, hcd->self.controller);
356 /*-------------------------------------------------------------------------*/
358 /* exported only within usbcore */
360 extern struct list_head usb_bus_list;
361 extern struct semaphore usb_bus_list_lock;
363 extern struct usb_bus *usb_bus_get (struct usb_bus *bus);
364 extern void usb_bus_put (struct usb_bus *bus);
366 extern int usb_find_interface_driver (struct usb_device *dev,
367 struct usb_interface *interface);
369 #define usb_endpoint_halt(dev, ep, out) ((dev)->halted[out] |= (1 << (ep)))
371 #define usb_endpoint_out(ep_dir) (!((ep_dir) & USB_DIR_IN))
374 * USB device fs stuff
377 #ifdef CONFIG_USB_DEVICEFS
380 * these are expected to be called from the USB core/hub thread
381 * with the kernel lock held
383 extern void usbfs_add_bus(struct usb_bus *bus);
384 extern void usbfs_remove_bus(struct usb_bus *bus);
385 extern void usbfs_add_device(struct usb_device *dev);
386 extern void usbfs_remove_device(struct usb_device *dev);
387 extern void usbfs_update_special (void);
389 extern int usbfs_init(void);
390 extern void usbfs_cleanup(void);
392 #else /* CONFIG_USB_DEVICEFS */
394 static inline void usbfs_add_bus(struct usb_bus *bus) {}
395 static inline void usbfs_remove_bus(struct usb_bus *bus) {}
396 static inline void usbfs_add_device(struct usb_device *dev) {}
397 static inline void usbfs_remove_device(struct usb_device *dev) {}
398 static inline void usbfs_update_special (void) {}
400 static inline int usbfs_init(void) { return 0; }
401 static inline void usbfs_cleanup(void) { }
403 #endif /* CONFIG_USB_DEVICEFS */
405 /*-------------------------------------------------------------------------*/
407 /* hub.h ... DeviceRemovable in 2.4.2-ac11, gone in 2.4.10 */
408 // bleech -- resurfaced in 2.4.11 or 2.4.12
409 #define bitmap DeviceRemovable
412 /*-------------------------------------------------------------------------*/
416 #define RUN_CONTEXT (in_irq () ? "in_irq" \
417 : (in_interrupt () ? "in_interrupt" : "can sleep"))
420 #endif /* __KERNEL__ */