drivers/usb/core/hcd.h

   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         char                    irq_descr[24];  /* driver + bus # */
  67
  68         struct timer_list       rh_timer;       /* drives root-hub polling */
  69         struct urb              *status_urb;    /* the current status urb */
  70
  71         /*
  72          * hardware info/state
  73          */
  74         const struct hc_driver  *driver;        /* hw-specific hooks */
  75         unsigned                saw_irq : 1;
  76         unsigned                can_wakeup:1;   /* hw supports wakeup? */
  77         unsigned                remote_wakeup:1;/* sw should use wakeup? */
  78         unsigned                rh_registered:1;/* is root hub registered? */
  79
  80         /* The next flag is a stopgap, to be removed when all the HCDs
  81          * support the new root-hub polling mechanism. */
  82         unsigned                uses_new_polling:1;
  83         unsigned                poll_rh:1;      /* poll for rh status? */
  84         unsigned                poll_pending:1; /* status has changed? */
  85
  86         int                     irq;            /* irq allocated */
  87         void __iomem            *regs;          /* device memory/io */
  88         u64                     rsrc_start;     /* memory/io resource start */
  89         u64                     rsrc_len;       /* memory/io resource length */
  90         unsigned                power_budget;   /* in mA, 0 = no limit */
  91
  92 #define HCD_BUFFER_POOLS        4
  93         struct dma_pool         *pool [HCD_BUFFER_POOLS];
  94
  95         int                     state;
  96 #       define  __ACTIVE                0x01
  97 #       define  __SUSPEND               0x04
  98 #       define  __TRANSIENT             0x80
  99
 100 #       define  HC_STATE_HALT           0
 101 #       define  HC_STATE_RUNNING        (__ACTIVE)
 102 #       define  HC_STATE_QUIESCING      (__SUSPEND|__TRANSIENT|__ACTIVE)
 103 #       define  HC_STATE_RESUMING       (__SUSPEND|__TRANSIENT)
 104 #       define  HC_STATE_SUSPENDED      (__SUSPEND)
 105
 106 #define HC_IS_RUNNING(state) ((state) & __ACTIVE)
 107 #define HC_IS_SUSPENDED(state) ((state) & __SUSPEND)
 108
 109         /* more shared queuing code would be good; it should support
 110          * smarter scheduling, handle transaction translators, etc;
 111          * input size of periodic table to an interrupt scheduler.
 112          * (ohci 32, uhci 1024, ehci 256/512/1024).
 113          */
 114
 115         /* The HC driver's private data is stored at the end of
 116          * this structure.
 117          */
 118         unsigned long hcd_priv[0]
 119                         __attribute__ ((aligned (sizeof(unsigned long))));
 120 };
 121
 122 /* 2.4 does this a bit differently ... */
 123 static inline struct usb_bus *hcd_to_bus (struct usb_hcd *hcd)
 124 {
 125         return &hcd->self;
 126 }
 127
 128
 129 // urb.hcpriv is really hardware-specific
 130
 131 struct hcd_timeout {    /* timeouts we allocate */
 132         struct list_head        timeout_list;
 133         struct timer_list       timer;
 134 };
 135
 136 /*-------------------------------------------------------------------------*/
 137
 138 /*
 139  * FIXME usb_operations should vanish or become hc_driver,
 140  * when usb_bus and usb_hcd become the same thing.
 141  */
 142
 143 struct usb_operations {
 144         int (*get_frame_number) (struct usb_device *usb_dev);
 145         int (*submit_urb) (struct urb *urb, gfp_t mem_flags);
 146         int (*unlink_urb) (struct urb *urb, int status);
 147
 148         /* allocate dma-consistent buffer for URB_DMA_NOMAPPING */
 149         void *(*buffer_alloc)(struct usb_bus *bus, size_t size,
 150                         gfp_t mem_flags,
 151                         dma_addr_t *dma);
 152         void (*buffer_free)(struct usb_bus *bus, size_t size,
 153                         void *addr, dma_addr_t dma);
 154
 155         void (*disable)(struct usb_device *udev,
 156                         struct usb_host_endpoint *ep);
 157 };
 158
 159 /* each driver provides one of these, and hardware init support */
 160
 161 struct pt_regs;
 162
 163 struct hc_driver {
 164         const char      *description;   /* "ehci-hcd" etc */
 165         const char      *product_desc;  /* product/vendor string */
 166         size_t          hcd_priv_size;  /* size of private data */
 167
 168         /* irq handler */
 169         irqreturn_t     (*irq) (struct usb_hcd *hcd, struct pt_regs *regs);
 170
 171         int     flags;
 172 #define HCD_MEMORY      0x0001          /* HC regs use memory (else I/O) */
 173 #define HCD_USB11       0x0010          /* USB 1.1 */
 174 #define HCD_USB2        0x0020          /* USB 2.0 */
 175
 176         /* called to init HCD and root hub */
 177         int     (*reset) (struct usb_hcd *hcd);
 178         int     (*start) (struct usb_hcd *hcd);
 179
 180         /* NOTE:  these suspend/resume calls relate to the HC as
 181          * a whole, not just the root hub; they're for PCI bus glue.
 182          */
 183         /* called after suspending the hub, before entering D3 etc */
 184         int     (*suspend) (struct usb_hcd *hcd, pm_message_t message);
 185
 186         /* called after entering D0 (etc), before resuming the hub */
 187         int     (*resume) (struct usb_hcd *hcd);
 188
 189         /* cleanly make HCD stop writing memory and doing I/O */
 190         void    (*stop) (struct usb_hcd *hcd);
 191
 192         /* return current frame number */
 193         int     (*get_frame_number) (struct usb_hcd *hcd);
 194
 195         /* manage i/o requests, device state */
 196         int     (*urb_enqueue) (struct usb_hcd *hcd,
 197                                         struct usb_host_endpoint *ep,
 198                                         struct urb *urb,
 199                                         gfp_t mem_flags);
 200         int     (*urb_dequeue) (struct usb_hcd *hcd, struct urb *urb);
 201
 202         /* hw synch, freeing endpoint resources that urb_dequeue can't */
 203         void    (*endpoint_disable)(struct usb_hcd *hcd,
 204                         struct usb_host_endpoint *ep);
 205
 206         /* root hub support */
 207         int             (*hub_status_data) (struct usb_hcd *hcd, char *buf);
 208         int             (*hub_control) (struct usb_hcd *hcd,
 209                                 u16 typeReq, u16 wValue, u16 wIndex,
 210                                 char *buf, u16 wLength);
 211         int             (*bus_suspend)(struct usb_hcd *);
 212         int             (*bus_resume)(struct usb_hcd *);
 213         int             (*start_port_reset)(struct usb_hcd *, unsigned port_num);
 214         void            (*hub_irq_enable)(struct usb_hcd *);
 215                 /* Needed only if port-change IRQs are level-triggered */
 216 };
 217
 218 extern void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs);
 219
 220 extern struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
 221                 struct device *dev, char *bus_name);
 222 extern void usb_put_hcd (struct usb_hcd *hcd);
 223 extern int usb_add_hcd(struct usb_hcd *hcd,
 224                 unsigned int irqnum, unsigned long irqflags);
 225 extern void usb_remove_hcd(struct usb_hcd *hcd);
 226
 227 #ifdef CONFIG_PCI
 228 struct pci_dev;
 229 struct pci_device_id;
 230 extern int usb_hcd_pci_probe (struct pci_dev *dev,
 231                                 const struct pci_device_id *id);
 232 extern void usb_hcd_pci_remove (struct pci_dev *dev);
 233
 234 #ifdef CONFIG_PM
 235 extern int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t state);
 236 extern int usb_hcd_pci_resume (struct pci_dev *dev);
 237 #endif /* CONFIG_PM */
 238
 239 #endif /* CONFIG_PCI */
 240
 241 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
 242 int hcd_buffer_create (struct usb_hcd *hcd);
 243 void hcd_buffer_destroy (struct usb_hcd *hcd);
 244
 245 void *hcd_buffer_alloc (struct usb_bus *bus, size_t size,
 246         gfp_t mem_flags, dma_addr_t *dma);
 247 void hcd_buffer_free (struct usb_bus *bus, size_t size,
 248         void *addr, dma_addr_t dma);
 249
 250 /* generic bus glue, needed for host controllers that don't use PCI */
 251 extern irqreturn_t usb_hcd_irq (int irq, void *__hcd, struct pt_regs *r);
 252
 253 extern void usb_hc_died (struct usb_hcd *hcd);
 254 extern void usb_hcd_poll_rh_status(struct usb_hcd *hcd);
 255
 256 /* -------------------------------------------------------------------------- */
 257
 258 /* Enumeration is only for the hub driver, or HCD virtual root hubs */
 259 extern struct usb_device *usb_alloc_dev(struct usb_device *parent,
 260                                         struct usb_bus *, unsigned port);
 261 extern int usb_new_device(struct usb_device *dev);
 262 extern void usb_disconnect(struct usb_device **);
 263
 264 extern int usb_get_configuration(struct usb_device *dev);
 265 extern void usb_destroy_configuration(struct usb_device *dev);
 266
 267 /*-------------------------------------------------------------------------*/
 268
 269 /*
 270  * HCD Root Hub support
 271  */
 272
 273 #include "hub.h"
 274
 275 /* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
 276 #define DeviceRequest \
 277         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
 278 #define DeviceOutRequest \
 279         ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
 280
 281 #define InterfaceRequest \
 282         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 283
 284 #define EndpointRequest \
 285         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 286 #define EndpointOutRequest \
 287         ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 288
 289 /* class requests from the USB 2.0 hub spec, table 11-15 */
 290 /* GetBusState and SetHubDescriptor are optional, omitted */
 291 #define ClearHubFeature         (0x2000 | USB_REQ_CLEAR_FEATURE)
 292 #define ClearPortFeature        (0x2300 | USB_REQ_CLEAR_FEATURE)
 293 #define GetHubDescriptor        (0xa000 | USB_REQ_GET_DESCRIPTOR)
 294 #define GetHubStatus            (0xa000 | USB_REQ_GET_STATUS)
 295 #define GetPortStatus           (0xa300 | USB_REQ_GET_STATUS)
 296 #define SetHubFeature           (0x2000 | USB_REQ_SET_FEATURE)
 297 #define SetPortFeature          (0x2300 | USB_REQ_SET_FEATURE)
 298
 299
 300 /*-------------------------------------------------------------------------*/
 301
 302 /*
 303  * Generic bandwidth allocation constants/support
 304  */
 305 #define FRAME_TIME_USECS        1000L
 306 #define BitTime(bytecount)  (7 * 8 * bytecount / 6)  /* with integer truncation */
 307                 /* Trying not to use worst-case bit-stuffing
 308                    of (7/6 * 8 * bytecount) = 9.33 * bytecount */
 309                 /* bytecount = data payload byte count */
 310
 311 #define NS_TO_US(ns)    ((ns + 500L) / 1000L)
 312                         /* convert & round nanoseconds to microseconds */
 313
 314 extern void usb_claim_bandwidth (struct usb_device *dev, struct urb *urb,
 315                 int bustime, int isoc);
 316 extern void usb_release_bandwidth (struct usb_device *dev, struct urb *urb,
 317                 int isoc);
 318
 319 /*
 320  * Full/low speed bandwidth allocation constants/support.
 321  */
 322 #define BW_HOST_DELAY   1000L           /* nanoseconds */
 323 #define BW_HUB_LS_SETUP 333L            /* nanoseconds */
 324                         /* 4 full-speed bit times (est.) */
 325
 326 #define FRAME_TIME_BITS         12000L          /* frame = 1 millisecond */
 327 #define FRAME_TIME_MAX_BITS_ALLOC       (90L * FRAME_TIME_BITS / 100L)
 328 #define FRAME_TIME_MAX_USECS_ALLOC      (90L * FRAME_TIME_USECS / 100L)
 329
 330 extern int usb_check_bandwidth (struct usb_device *dev, struct urb *urb);
 331
 332 /*
 333  * Ceiling [nano/micro]seconds (typical) for that many bytes at high speed
 334  * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
 335  * to preallocate bandwidth)
 336  */
 337 #define USB2_HOST_DELAY 5       /* nsec, guess */
 338 #define HS_NSECS(bytes) ( ((55 * 8 * 2083) \
 339         + (2083UL * (3 + BitTime(bytes))))/1000 \
 340         + USB2_HOST_DELAY)
 341 #define HS_NSECS_ISO(bytes) ( ((38 * 8 * 2083) \
 342         + (2083UL * (3 + BitTime(bytes))))/1000 \
 343         + USB2_HOST_DELAY)
 344 #define HS_USECS(bytes) NS_TO_US (HS_NSECS(bytes))
 345 #define HS_USECS_ISO(bytes) NS_TO_US (HS_NSECS_ISO(bytes))
 346
 347 extern long usb_calc_bus_time (int speed, int is_input,
 348                         int isoc, int bytecount);
 349
 350 /*-------------------------------------------------------------------------*/
 351
 352 extern struct usb_bus *usb_alloc_bus (struct usb_operations *);
 353
 354 extern void usb_hcd_suspend_root_hub (struct usb_hcd *hcd);
 355 extern void usb_hcd_resume_root_hub (struct usb_hcd *hcd);
 356
 357 extern void usb_set_device_state(struct usb_device *udev,
 358                 enum usb_device_state new_state);
 359
 360 /*-------------------------------------------------------------------------*/
 361
 362 /* exported only within usbcore */
 363
 364 extern struct list_head usb_bus_list;
 365 extern struct semaphore usb_bus_list_lock;
 366 extern wait_queue_head_t usb_kill_urb_queue;
 367
 368 extern struct usb_bus *usb_bus_get (struct usb_bus *bus);
 369 extern void usb_bus_put (struct usb_bus *bus);
 370
 371 extern void usb_enable_root_hub_irq (struct usb_bus *bus);
 372
 373 extern int usb_find_interface_driver (struct usb_device *dev,
 374         struct usb_interface *interface);
 375
 376 #define usb_endpoint_out(ep_dir)        (!((ep_dir) & USB_DIR_IN))
 377
 378 #ifdef CONFIG_PM
 379 extern int hcd_bus_suspend (struct usb_bus *bus);
 380 extern int hcd_bus_resume (struct usb_bus *bus);
 381 #else
 382 static inline int hcd_bus_suspend(struct usb_bus *bus)
 383 {
 384         return 0;
 385 }
 386
 387 static inline int hcd_bus_resume (struct usb_bus *bus)
 388 {
 389         return 0;
 390 }
 391 #endif /* CONFIG_PM */
 392
 393 /*
 394  * USB device fs stuff
 395  */
 396
 397 #ifdef CONFIG_USB_DEVICEFS
 398
 399 /*
 400  * these are expected to be called from the USB core/hub thread
 401  * with the kernel lock held
 402  */
 403 extern void usbfs_update_special (void);
 404 extern int usbfs_init(void);
 405 extern void usbfs_cleanup(void);
 406
 407 #else /* CONFIG_USB_DEVICEFS */
 408
 409 static inline void usbfs_update_special (void) {}
 410 static inline int usbfs_init(void) { return 0; }
 411 static inline void usbfs_cleanup(void) { }
 412
 413 #endif /* CONFIG_USB_DEVICEFS */
 414
 415 /*-------------------------------------------------------------------------*/
 416
 417 #if defined(CONFIG_USB_MON)
 418
 419 struct usb_mon_operations {
 420         void (*urb_submit)(struct usb_bus *bus, struct urb *urb);
 421         void (*urb_submit_error)(struct usb_bus *bus, struct urb *urb, int err);
 422         void (*urb_complete)(struct usb_bus *bus, struct urb *urb);
 423         /* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
 424         void (*bus_add)(struct usb_bus *bus);
 425         void (*bus_remove)(struct usb_bus *bus);
 426 };
 427
 428 extern struct usb_mon_operations *mon_ops;
 429
 430 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb)
 431 {
 432         if (bus->monitored)
 433                 (*mon_ops->urb_submit)(bus, urb);
 434 }
 435
 436 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
 437     int error)
 438 {
 439         if (bus->monitored)
 440                 (*mon_ops->urb_submit_error)(bus, urb, error);
 441 }
 442
 443 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb)
 444 {
 445         if (bus->monitored)
 446                 (*mon_ops->urb_complete)(bus, urb);
 447 }
 448
 449 static inline void usbmon_notify_bus_add(struct usb_bus *bus)
 450 {
 451         if (mon_ops)
 452                 (*mon_ops->bus_add)(bus);
 453 }
 454
 455 static inline void usbmon_notify_bus_remove(struct usb_bus *bus)
 456 {
 457         if (mon_ops)
 458                 (*mon_ops->bus_remove)(bus);
 459 }
 460
 461 int usb_mon_register(struct usb_mon_operations *ops);
 462 void usb_mon_deregister(void);
 463
 464 #else
 465
 466 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb) {}
 467 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
 468     int error) {}
 469 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb) {}
 470 static inline void usbmon_notify_bus_add(struct usb_bus *bus) {}
 471 static inline void usbmon_notify_bus_remove(struct usb_bus *bus) {}
 472
 473 #endif /* CONFIG_USB_MON */
 474
 475 /*-------------------------------------------------------------------------*/
 476
 477 /* hub.h ... DeviceRemovable in 2.4.2-ac11, gone in 2.4.10 */
 478 // bleech -- resurfaced in 2.4.11 or 2.4.12
 479 #define bitmap  DeviceRemovable
 480
 481
 482 /*-------------------------------------------------------------------------*/
 483
 484 /* random stuff */
 485
 486 #define RUN_CONTEXT (in_irq () ? "in_irq" \
 487                 : (in_interrupt () ? "in_interrupt" : "can sleep"))
 488
 489
 490 #endif /* __KERNEL__ */
 491