1 /*
2 * Copyright (c) 2001-2002 by David Brownell
3 *
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.
8 *
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
12 * for more details.
13 *
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.
17 */
18
19
20 #ifdef __KERNEL__
21
22 /* This file contains declarations of usbcore internals that are mostly
23 * used or exposed by Host Controller Drivers.
24 */
25
26 /*
27 * USB Packet IDs (PIDs)
28 */
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 */
46
47 /*-------------------------------------------------------------------------*/
48
49 /*
50 * USB Host Controller Driver (usb_hcd) framework
51 *
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.
54 */
55
56 /*-------------------------------------------------------------------------*/
57
58 struct usb_hcd { /* usb_bus.hcpriv points to this */
59
60 /*
61 * housekeeping
62 */
63 struct usb_bus self; /* hcd is-a bus */
64
65 const char *product_desc; /* product/vendor string */
66
67 struct timer_list rh_timer; /* drives root hub */
68
69 /*
70 * hardware info/state
71 */
72 const struct hc_driver *driver; /* hw-specific hooks */
73 unsigned saw_irq : 1;
74 unsigned can_wakeup:1; /* hw supports wakeup? */
75 unsigned remote_wakeup:1;/* sw should use wakeup? */
76 int irq; /* irq allocated */
77 void __iomem *regs; /* device memory/io */
78
79 #ifdef CONFIG_PCI
80 int region; /* pci region for regs */
81 #endif
82
83 #define HCD_BUFFER_POOLS 4
84 struct dma_pool *pool [HCD_BUFFER_POOLS];
85
86 int state;
87 # define __ACTIVE 0x01
88 # define __SUSPEND 0x04
89 # define __TRANSIENT 0x80
90
91 # define USB_STATE_HALT 0
92 # define USB_STATE_RUNNING (__ACTIVE)
93 # define USB_STATE_QUIESCING (__SUSPEND|__TRANSIENT|__ACTIVE)
94 # define USB_STATE_RESUMING (__SUSPEND|__TRANSIENT)
95 # define HCD_STATE_SUSPENDED (__SUSPEND)
96
97 #define HCD_IS_RUNNING(state) ((state) & __ACTIVE)
98 #define HCD_IS_SUSPENDED(state) ((state) & __SUSPEND)
99
100 /* more shared queuing code would be good; it should support
101 * smarter scheduling, handle transaction translators, etc;
102 * input size of periodic table to an interrupt scheduler.
103 * (ohci 32, uhci 1024, ehci 256/512/1024).
104 */
105
106 /* The HC driver's private data is stored at the end of
107 * this structure.
108 */
109 unsigned long hcd_priv[0]
110 __attribute__ ((aligned (sizeof(unsigned long))));
111 };
112
113 /* 2.4 does this a bit differently ... */
114 static inline struct usb_bus *hcd_to_bus (struct usb_hcd *hcd)
115 {
116 return &hcd->self;
117 }
118
119
120 // urb.hcpriv is really hardware-specific
121
122 struct hcd_timeout { /* timeouts we allocate */
123 struct list_head timeout_list;
124 struct timer_list timer;
125 };
126
127 /*-------------------------------------------------------------------------*/
128
129 /*
130 * FIXME usb_operations should vanish or become hc_driver,
131 * when usb_bus and usb_hcd become the same thing.
132 */
133
134 struct usb_operations {
135 int (*get_frame_number) (struct usb_device *usb_dev);
136 int (*submit_urb) (struct urb *urb, int mem_flags);
137 int (*unlink_urb) (struct urb *urb, int status);
138
139 /* allocate dma-consistent buffer for URB_DMA_NOMAPPING */
140 void *(*buffer_alloc)(struct usb_bus *bus, size_t size,
141 int mem_flags,
142 dma_addr_t *dma);
143 void (*buffer_free)(struct usb_bus *bus, size_t size,
144 void *addr, dma_addr_t dma);
145
146 void (*disable)(struct usb_device *udev,
147 struct usb_host_endpoint *ep);
148
149 /* global suspend/resume of bus */
150 int (*hub_suspend)(struct usb_bus *);
151 int (*hub_resume)(struct usb_bus *);
152 };
153
154 /* each driver provides one of these, and hardware init support */
155
156 struct pt_regs;
157
158 struct hc_driver {
159 const char *description; /* "ehci-hcd" etc */
160 const char *product_desc; /* product/vendor string */
161 size_t hcd_priv_size; /* size of private data */
162
163 /* irq handler */
164 irqreturn_t (*irq) (struct usb_hcd *hcd, struct pt_regs *regs);
165
166 int flags;
167 #define HCD_MEMORY 0x0001 /* HC regs use memory (else I/O) */
168 #define HCD_USB11 0x0010 /* USB 1.1 */
169 #define HCD_USB2 0x0020 /* USB 2.0 */
170
171 /* called to init HCD and root hub */
172 int (*reset) (struct usb_hcd *hcd);
173 int (*start) (struct usb_hcd *hcd);
174
175 /* NOTE: these suspend/resume calls relate to the HC as
176 * a whole, not just the root hub; they're for bus glue.
177 */
178 /* called after all devices were suspended */
179 int (*suspend) (struct usb_hcd *hcd, u32 state);
180
181 /* called before any devices get resumed */
182 int (*resume) (struct usb_hcd *hcd);
183
184 /* cleanly make HCD stop writing memory and doing I/O */
185 void (*stop) (struct usb_hcd *hcd);
186
187 /* return current frame number */
188 int (*get_frame_number) (struct usb_hcd *hcd);
189
190 /* manage i/o requests, device state */
191 int (*urb_enqueue) (struct usb_hcd *hcd,
192 struct usb_host_endpoint *ep,
193 struct urb *urb,
194 int mem_flags);
195 int (*urb_dequeue) (struct usb_hcd *hcd, struct urb *urb);
196
197 /* hw synch, freeing endpoint resources that urb_dequeue can't */
198 void (*endpoint_disable)(struct usb_hcd *hcd,
199 struct usb_host_endpoint *ep);
200
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);
206 int (*hub_suspend)(struct usb_hcd *);
207 int (*hub_resume)(struct usb_hcd *);
208 int (*start_port_reset)(struct usb_hcd *, unsigned port_num);
209 };
210
211 extern void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs);
212 extern void usb_bus_init (struct usb_bus *bus);
213
214 extern struct usb_hcd *usb_create_hcd (const struct hc_driver *driver);
215 extern void usb_put_hcd (struct usb_hcd *hcd);
216
217
218 #ifdef CONFIG_PCI
219 struct pci_dev;
220 struct pci_device_id;
221 extern int usb_hcd_pci_probe (struct pci_dev *dev,
222 const struct pci_device_id *id);
223 extern void usb_hcd_pci_remove (struct pci_dev *dev);
224
225 #ifdef CONFIG_PM
226 extern int usb_hcd_pci_suspend (struct pci_dev *dev, u32 state);
227 extern int usb_hcd_pci_resume (struct pci_dev *dev);
228 #endif /* CONFIG_PM */
229
230 #endif /* CONFIG_PCI */
231
232 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
233 int hcd_buffer_create (struct usb_hcd *hcd);
234 void hcd_buffer_destroy (struct usb_hcd *hcd);
235
236 void *hcd_buffer_alloc (struct usb_bus *bus, size_t size,
237 int mem_flags, dma_addr_t *dma);
238 void hcd_buffer_free (struct usb_bus *bus, size_t size,
239 void *addr, dma_addr_t dma);
240
241 /* generic bus glue, needed for host controllers that don't use PCI */
242 extern irqreturn_t usb_hcd_irq (int irq, void *__hcd, struct pt_regs *r);
243 extern void usb_hc_died (struct usb_hcd *hcd);
244
245 /* -------------------------------------------------------------------------- */
246
247 /* Enumeration is only for the hub driver, or HCD virtual root hubs */
248 extern struct usb_device *usb_alloc_dev(struct usb_device *parent,
249 struct usb_bus *, unsigned port);
250 extern int usb_new_device(struct usb_device *dev);
251 extern void usb_disconnect(struct usb_device **);
252
253 extern int usb_get_configuration(struct usb_device *dev);
254 extern void usb_destroy_configuration(struct usb_device *dev);
255
256 /*-------------------------------------------------------------------------*/
257
258 /*
259 * HCD Root Hub support
260 */
261
262 #include "hub.h"
263
264 /* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
265 #define DeviceRequest \
266 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
267 #define DeviceOutRequest \
268 ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
269
270 #define InterfaceRequest \
271 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
272
273 #define EndpointRequest \
274 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
275 #define EndpointOutRequest \
276 ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
277
278 /* class requests from the USB 2.0 hub spec, table 11-15 */
279 /* GetBusState and SetHubDescriptor are optional, omitted */
280 #define ClearHubFeature (0x2000 | USB_REQ_CLEAR_FEATURE)
281 #define ClearPortFeature (0x2300 | USB_REQ_CLEAR_FEATURE)
282 #define GetHubDescriptor (0xa000 | USB_REQ_GET_DESCRIPTOR)
283 #define GetHubStatus (0xa000 | USB_REQ_GET_STATUS)
284 #define GetPortStatus (0xa300 | USB_REQ_GET_STATUS)
285 #define SetHubFeature (0x2000 | USB_REQ_SET_FEATURE)
286 #define SetPortFeature (0x2300 | USB_REQ_SET_FEATURE)
287
288
289 /*-------------------------------------------------------------------------*/
290
291 /*
292 * Generic bandwidth allocation constants/support
293 */
294 #define FRAME_TIME_USECS 1000L
295 #define BitTime(bytecount) (7 * 8 * bytecount / 6) /* with integer truncation */
296 /* Trying not to use worst-case bit-stuffing
297 of (7/6 * 8 * bytecount) = 9.33 * bytecount */
298 /* bytecount = data payload byte count */
299
300 #define NS_TO_US(ns) ((ns + 500L) / 1000L)
301 /* convert & round nanoseconds to microseconds */
302
303 extern void usb_claim_bandwidth (struct usb_device *dev, struct urb *urb,
304 int bustime, int isoc);
305 extern void usb_release_bandwidth (struct usb_device *dev, struct urb *urb,
306 int isoc);
307
308 /*
309 * Full/low speed bandwidth allocation constants/support.
310 */
311 #define BW_HOST_DELAY 1000L /* nanoseconds */
312 #define BW_HUB_LS_SETUP 333L /* nanoseconds */
313 /* 4 full-speed bit times (est.) */
314
315 #define FRAME_TIME_BITS 12000L /* frame = 1 millisecond */
316 #define FRAME_TIME_MAX_BITS_ALLOC (90L * FRAME_TIME_BITS / 100L)
317 #define FRAME_TIME_MAX_USECS_ALLOC (90L * FRAME_TIME_USECS / 100L)
318
319 extern int usb_check_bandwidth (struct usb_device *dev, struct urb *urb);
320
321 /*
322 * Ceiling microseconds (typical) for that many bytes at high speed
323 * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
324 * to preallocate bandwidth)
325 */
326 #define USB2_HOST_DELAY 5 /* nsec, guess */
327 #define HS_USECS(bytes) NS_TO_US ( ((55 * 8 * 2083)/1000) \
328 + ((2083UL * (3167 + BitTime (bytes)))/1000) \
329 + USB2_HOST_DELAY)
330 #define HS_USECS_ISO(bytes) NS_TO_US ( ((38 * 8 * 2083)/1000) \
331 + ((2083UL * (3167 + BitTime (bytes)))/1000) \
332 + USB2_HOST_DELAY)
333
334 extern long usb_calc_bus_time (int speed, int is_input,
335 int isoc, int bytecount);
336
337 /*-------------------------------------------------------------------------*/
338
339 extern struct usb_bus *usb_alloc_bus (struct usb_operations *);
340
341 extern int usb_register_bus (struct usb_bus *);
342 extern void usb_deregister_bus (struct usb_bus *);
343
344 extern int usb_register_root_hub (struct usb_device *usb_dev,
345 struct device *parent_dev);
346
347 static inline int hcd_register_root (struct usb_device *usb_dev,
348 struct usb_hcd *hcd)
349 {
350 /* hcd->driver->start() reported can_wakeup, probably with
351 * assistance from board's boot firmware.
352 * NOTE: normal devices won't enable wakeup by default.
353 */
354 if (hcd->can_wakeup)
355 dev_dbg (hcd->self.controller, "supports USB remote wakeup\n");
356 hcd->remote_wakeup = hcd->can_wakeup;
357
358 return usb_register_root_hub (usb_dev, hcd->self.controller);
359 }
360
361 extern void usb_set_device_state(struct usb_device *udev,
362 enum usb_device_state new_state);
363
364 /*-------------------------------------------------------------------------*/
365
366 /* exported only within usbcore */
367
368 extern struct list_head usb_bus_list;
369 extern struct semaphore usb_bus_list_lock;
370 extern wait_queue_head_t usb_kill_urb_queue;
371
372 extern struct usb_bus *usb_bus_get (struct usb_bus *bus);
373 extern void usb_bus_put (struct usb_bus *bus);
374
375 extern int usb_find_interface_driver (struct usb_device *dev,
376 struct usb_interface *interface);
377
378 #define usb_endpoint_out(ep_dir) (!((ep_dir) & USB_DIR_IN))
379
380 /*
381 * USB device fs stuff
382 */
383
384 #ifdef CONFIG_USB_DEVICEFS
385
386 /*
387 * these are expected to be called from the USB core/hub thread
388 * with the kernel lock held
389 */
390 extern void usbfs_add_bus(struct usb_bus *bus);
391 extern void usbfs_remove_bus(struct usb_bus *bus);
392 extern void usbfs_add_device(struct usb_device *dev);
393 extern void usbfs_remove_device(struct usb_device *dev);
394 extern void usbfs_update_special (void);
395
396 extern int usbfs_init(void);
397 extern void usbfs_cleanup(void);
398
399 #else /* CONFIG_USB_DEVICEFS */
400
401 static inline void usbfs_add_bus(struct usb_bus *bus) {}
402 static inline void usbfs_remove_bus(struct usb_bus *bus) {}
403 static inline void usbfs_add_device(struct usb_device *dev) {}
404 static inline void usbfs_remove_device(struct usb_device *dev) {}
405 static inline void usbfs_update_special (void) {}
406
407 static inline int usbfs_init(void) { return 0; }
408 static inline void usbfs_cleanup(void) { }
409
410 #endif /* CONFIG_USB_DEVICEFS */
411
412 /*-------------------------------------------------------------------------*/
413
414 /* hub.h ... DeviceRemovable in 2.4.2-ac11, gone in 2.4.10 */
415 // bleech -- resurfaced in 2.4.11 or 2.4.12
416 #define bitmap DeviceRemovable
417
418
419 /*-------------------------------------------------------------------------*/
420
421 /* random stuff */
422
423 #define RUN_CONTEXT (in_irq () ? "in_irq" \
424 : (in_interrupt () ? "in_interrupt" : "can sleep"))
425
426
427 #endif /* __KERNEL__ */
428
429
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