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 {
  59
  60         /*
  61          * housekeeping
  62          */
  63         struct usb_bus          self;           /* hcd is-a bus */
  64         struct kref             kref;           /* reference counter */
  65
  66         const char              *product_desc;  /* product/vendor string */
  67         char                    irq_descr[24];  /* driver + bus # */
  68
  69         struct timer_list       rh_timer;       /* drives root-hub polling */
  70         struct urb              *status_urb;    /* the current status urb */
  71
  72         /*
  73          * hardware info/state
  74          */
  75         const struct hc_driver  *driver;        /* hw-specific hooks */
  76
  77         /* Flags that need to be manipulated atomically */
  78         unsigned long           flags;
  79 #define HCD_FLAG_HW_ACCESSIBLE  0x00000001
  80 #define HCD_FLAG_SAW_IRQ        0x00000002
  81
  82         unsigned                rh_registered:1;/* is root hub registered? */
  83
  84         /* The next flag is a stopgap, to be removed when all the HCDs
  85          * support the new root-hub polling mechanism. */
  86         unsigned                uses_new_polling:1;
  87         unsigned                poll_rh:1;      /* poll for rh status? */
  88         unsigned                poll_pending:1; /* status has changed? */
  89         unsigned                wireless:1;     /* Wireless USB HCD */
  90
  91         int                     irq;            /* irq allocated */
  92         void __iomem            *regs;          /* device memory/io */
  93         u64                     rsrc_start;     /* memory/io resource start */
  94         u64                     rsrc_len;       /* memory/io resource length */
  95         unsigned                power_budget;   /* in mA, 0 = no limit */
  96
  97 #define HCD_BUFFER_POOLS        4
  98         struct dma_pool         *pool [HCD_BUFFER_POOLS];
  99
 100         int                     state;
 101 #       define  __ACTIVE                0x01
 102 #       define  __SUSPEND               0x04
 103 #       define  __TRANSIENT             0x80
 104
 105 #       define  HC_STATE_HALT           0
 106 #       define  HC_STATE_RUNNING        (__ACTIVE)
 107 #       define  HC_STATE_QUIESCING      (__SUSPEND|__TRANSIENT|__ACTIVE)
 108 #       define  HC_STATE_RESUMING       (__SUSPEND|__TRANSIENT)
 109 #       define  HC_STATE_SUSPENDED      (__SUSPEND)
 110
 111 #define HC_IS_RUNNING(state) ((state) & __ACTIVE)
 112 #define HC_IS_SUSPENDED(state) ((state) & __SUSPEND)
 113
 114         /* more shared queuing code would be good; it should support
 115          * smarter scheduling, handle transaction translators, etc;
 116          * input size of periodic table to an interrupt scheduler.
 117          * (ohci 32, uhci 1024, ehci 256/512/1024).
 118          */
 119
 120         /* The HC driver's private data is stored at the end of
 121          * this structure.
 122          */
 123         unsigned long hcd_priv[0]
 124                         __attribute__ ((aligned (sizeof(unsigned long))));
 125 };
 126
 127 /* 2.4 does this a bit differently ... */
 128 static inline struct usb_bus *hcd_to_bus (struct usb_hcd *hcd)
 129 {
 130         return &hcd->self;
 131 }
 132
 133 static inline struct usb_hcd *bus_to_hcd (struct usb_bus *bus)
 134 {
 135         return container_of(bus, struct usb_hcd, self);
 136 }
 137
 138 struct hcd_timeout {    /* timeouts we allocate */
 139         struct list_head        timeout_list;
 140         struct timer_list       timer;
 141 };
 142
 143 /*-------------------------------------------------------------------------*/
 144
 145
 146 struct pt_regs;
 147
 148 struct hc_driver {
 149         const char      *description;   /* "ehci-hcd" etc */
 150         const char      *product_desc;  /* product/vendor string */
 151         size_t          hcd_priv_size;  /* size of private data */
 152
 153         /* irq handler */
 154         irqreturn_t     (*irq) (struct usb_hcd *hcd, struct pt_regs *regs);
 155
 156         int     flags;
 157 #define HCD_MEMORY      0x0001          /* HC regs use memory (else I/O) */
 158 #define HCD_USB11       0x0010          /* USB 1.1 */
 159 #define HCD_USB2        0x0020          /* USB 2.0 */
 160
 161         /* called to init HCD and root hub */
 162         int     (*reset) (struct usb_hcd *hcd);
 163         int     (*start) (struct usb_hcd *hcd);
 164
 165         /* NOTE:  these suspend/resume calls relate to the HC as
 166          * a whole, not just the root hub; they're for PCI bus glue.
 167          */
 168         /* called after suspending the hub, before entering D3 etc */
 169         int     (*suspend) (struct usb_hcd *hcd, pm_message_t message);
 170
 171         /* called after entering D0 (etc), before resuming the hub */
 172         int     (*resume) (struct usb_hcd *hcd);
 173
 174         /* cleanly make HCD stop writing memory and doing I/O */
 175         void    (*stop) (struct usb_hcd *hcd);
 176
 177         /* shutdown HCD */
 178         void    (*shutdown) (struct usb_hcd *hcd);
 179
 180         /* return current frame number */
 181         int     (*get_frame_number) (struct usb_hcd *hcd);
 182
 183         /* manage i/o requests, device state */
 184         int     (*urb_enqueue) (struct usb_hcd *hcd,
 185                                         struct usb_host_endpoint *ep,
 186                                         struct urb *urb,
 187                                         gfp_t mem_flags);
 188         int     (*urb_dequeue) (struct usb_hcd *hcd, struct urb *urb);
 189
 190         /* hw synch, freeing endpoint resources that urb_dequeue can't */
 191         void    (*endpoint_disable)(struct usb_hcd *hcd,
 192                         struct usb_host_endpoint *ep);
 193
 194         /* root hub support */
 195         int             (*hub_status_data) (struct usb_hcd *hcd, char *buf);
 196         int             (*hub_control) (struct usb_hcd *hcd,
 197                                 u16 typeReq, u16 wValue, u16 wIndex,
 198                                 char *buf, u16 wLength);
 199         int             (*bus_suspend)(struct usb_hcd *);
 200         int             (*bus_resume)(struct usb_hcd *);
 201         int             (*start_port_reset)(struct usb_hcd *, unsigned port_num);
 202         void            (*hub_irq_enable)(struct usb_hcd *);
 203                 /* Needed only if port-change IRQs are level-triggered */
 204 };
 205
 206 extern int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags);
 207 extern int usb_hcd_unlink_urb (struct urb *urb, int status);
 208 extern void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb,
 209                 struct pt_regs *regs);
 210 extern void usb_hcd_endpoint_disable (struct usb_device *udev,
 211                 struct usb_host_endpoint *ep);
 212 extern int usb_hcd_get_frame_number (struct usb_device *udev);
 213
 214 extern struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
 215                 struct device *dev, char *bus_name);
 216 extern struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd);
 217 extern void usb_put_hcd (struct usb_hcd *hcd);
 218 extern int usb_add_hcd(struct usb_hcd *hcd,
 219                 unsigned int irqnum, unsigned long irqflags);
 220 extern void usb_remove_hcd(struct usb_hcd *hcd);
 221
 222 struct platform_device;
 223 extern void usb_hcd_platform_shutdown(struct platform_device* dev);
 224
 225 #ifdef CONFIG_PCI
 226 struct pci_dev;
 227 struct pci_device_id;
 228 extern int usb_hcd_pci_probe (struct pci_dev *dev,
 229                                 const struct pci_device_id *id);
 230 extern void usb_hcd_pci_remove (struct pci_dev *dev);
 231
 232 #ifdef CONFIG_PM
 233 extern int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t state);
 234 extern int usb_hcd_pci_resume (struct pci_dev *dev);
 235 #endif /* CONFIG_PM */
 236
 237 extern void usb_hcd_pci_shutdown (struct pci_dev *dev);
 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 void usb_set_device_state(struct usb_device *udev,
 353                 enum usb_device_state new_state);
 354
 355 /*-------------------------------------------------------------------------*/
 356
 357 /* exported only within usbcore */
 358
 359 extern struct list_head usb_bus_list;
 360 extern struct mutex usb_bus_list_lock;
 361 extern wait_queue_head_t usb_kill_urb_queue;
 362
 363 extern void usb_enable_root_hub_irq (struct usb_bus *bus);
 364
 365 extern int usb_find_interface_driver (struct usb_device *dev,
 366         struct usb_interface *interface);
 367
 368 #define usb_endpoint_out(ep_dir)        (!((ep_dir) & USB_DIR_IN))
 369
 370 #ifdef CONFIG_PM
 371 extern void usb_hcd_resume_root_hub (struct usb_hcd *hcd);
 372 extern void usb_root_hub_lost_power (struct usb_device *rhdev);
 373 extern int hcd_bus_suspend (struct usb_bus *bus);
 374 extern int hcd_bus_resume (struct usb_bus *bus);
 375 #else
 376 static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
 377 {
 378         return;
 379 }
 380
 381 static inline int hcd_bus_suspend(struct usb_bus *bus)
 382 {
 383         return 0;
 384 }
 385
 386 static inline int hcd_bus_resume (struct usb_bus *bus)
 387 {
 388         return 0;
 389 }
 390 #endif /* CONFIG_PM */
 391
 392 /*
 393  * USB device fs stuff
 394  */
 395
 396 #ifdef CONFIG_USB_DEVICEFS
 397
 398 /*
 399  * these are expected to be called from the USB core/hub thread
 400  * with the kernel lock held
 401  */
 402 extern void usbfs_update_special (void);
 403 extern int usbfs_init(void);
 404 extern void usbfs_cleanup(void);
 405
 406 #else /* CONFIG_USB_DEVICEFS */
 407
 408 static inline void usbfs_update_special (void) {}
 409 static inline int usbfs_init(void) { return 0; }
 410 static inline void usbfs_cleanup(void) { }
 411
 412 #endif /* CONFIG_USB_DEVICEFS */
 413
 414 /*-------------------------------------------------------------------------*/
 415
 416 #if defined(CONFIG_USB_MON)
 417
 418 struct usb_mon_operations {
 419         void (*urb_submit)(struct usb_bus *bus, struct urb *urb);
 420         void (*urb_submit_error)(struct usb_bus *bus, struct urb *urb, int err);
 421         void (*urb_complete)(struct usb_bus *bus, struct urb *urb);
 422         /* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
 423 };
 424
 425 extern struct usb_mon_operations *mon_ops;
 426
 427 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb)
 428 {
 429         if (bus->monitored)
 430                 (*mon_ops->urb_submit)(bus, urb);
 431 }
 432
 433 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
 434     int error)
 435 {
 436         if (bus->monitored)
 437                 (*mon_ops->urb_submit_error)(bus, urb, error);
 438 }
 439
 440 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb)
 441 {
 442         if (bus->monitored)
 443                 (*mon_ops->urb_complete)(bus, urb);
 444 }
 445
 446 int usb_mon_register(struct usb_mon_operations *ops);
 447 void usb_mon_deregister(void);
 448
 449 #else
 450
 451 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb) {}
 452 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
 453     int error) {}
 454 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb) {}
 455
 456 #endif /* CONFIG_USB_MON */
 457
 458 /*-------------------------------------------------------------------------*/
 459
 460 /* hub.h ... DeviceRemovable in 2.4.2-ac11, gone in 2.4.10 */
 461 // bleech -- resurfaced in 2.4.11 or 2.4.12
 462 #define bitmap  DeviceRemovable
 463
 464
 465 /*-------------------------------------------------------------------------*/
 466
 467 /* random stuff */
 468
 469 #define RUN_CONTEXT (in_irq () ? "in_irq" \
 470                 : (in_interrupt () ? "in_interrupt" : "can sleep"))
 471
 472
 473 #endif /* __KERNEL__ */
 474