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 #include <linux/rwsem.h>
  23
  24 #define MAX_TOPO_LEVEL          6
  25
  26 /* This file contains declarations of usbcore internals that are mostly
  27  * used or exposed by Host Controller Drivers.
  28  */
  29
  30 /*
  31  * USB Packet IDs (PIDs)
  32  */
  33 #define USB_PID_EXT                     0xf0    /* USB 2.0 LPM ECN */
  34 #define USB_PID_OUT                     0xe1
  35 #define USB_PID_ACK                     0xd2
  36 #define USB_PID_DATA0                   0xc3
  37 #define USB_PID_PING                    0xb4    /* USB 2.0 */
  38 #define USB_PID_SOF                     0xa5
  39 #define USB_PID_NYET                    0x96    /* USB 2.0 */
  40 #define USB_PID_DATA2                   0x87    /* USB 2.0 */
  41 #define USB_PID_SPLIT                   0x78    /* USB 2.0 */
  42 #define USB_PID_IN                      0x69
  43 #define USB_PID_NAK                     0x5a
  44 #define USB_PID_DATA1                   0x4b
  45 #define USB_PID_PREAMBLE                0x3c    /* Token mode */
  46 #define USB_PID_ERR                     0x3c    /* USB 2.0: handshake mode */
  47 #define USB_PID_SETUP                   0x2d
  48 #define USB_PID_STALL                   0x1e
  49 #define USB_PID_MDATA                   0x0f    /* USB 2.0 */
  50
  51 /*-------------------------------------------------------------------------*/
  52
  53 /*
  54  * USB Host Controller Driver (usb_hcd) framework
  55  *
  56  * Since "struct usb_bus" is so thin, you can't share much code in it.
  57  * This framework is a layer over that, and should be more sharable.
  58  *
  59  * @authorized_default: Specifies if new devices are authorized to
  60  *                      connect by default or they require explicit
  61  *                      user space authorization; this bit is settable
  62  *                      through /sys/class/usb_host/X/authorized_default.
  63  *                      For the rest is RO, so we don't lock to r/w it.
  64  */
  65
  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         char                    irq_descr[24];  /* driver + bus # */
  78
  79         struct timer_list       rh_timer;       /* drives root-hub polling */
  80         struct urb              *status_urb;    /* the current status urb */
  81 #ifdef CONFIG_PM
  82         struct work_struct      wakeup_work;    /* for remote wakeup */
  83 #endif
  84
  85         /*
  86          * hardware info/state
  87          */
  88         const struct hc_driver  *driver;        /* hw-specific hooks */
  89
  90         /* Flags that need to be manipulated atomically */
  91         unsigned long           flags;
  92 #define HCD_FLAG_HW_ACCESSIBLE  0x00000001
  93 #define HCD_FLAG_SAW_IRQ        0x00000002
  94
  95         unsigned                rh_registered:1;/* is root hub registered? */
  96
  97         /* The next flag is a stopgap, to be removed when all the HCDs
  98          * support the new root-hub polling mechanism. */
  99         unsigned                uses_new_polling:1;
 100         unsigned                poll_rh:1;      /* poll for rh status? */
 101         unsigned                poll_pending:1; /* status has changed? */
 102         unsigned                wireless:1;     /* Wireless USB HCD */
 103         unsigned                authorized_default:1;
 104         unsigned                has_tt:1;       /* Integrated TT in root hub */
 105
 106         int                     irq;            /* irq allocated */
 107         void __iomem            *regs;          /* device memory/io */
 108         u64                     rsrc_start;     /* memory/io resource start */
 109         u64                     rsrc_len;       /* memory/io resource length */
 110         unsigned                power_budget;   /* in mA, 0 = no limit */
 111
 112 #define HCD_BUFFER_POOLS        4
 113         struct dma_pool         *pool [HCD_BUFFER_POOLS];
 114
 115         int                     state;
 116 #       define  __ACTIVE                0x01
 117 #       define  __SUSPEND               0x04
 118 #       define  __TRANSIENT             0x80
 119
 120 #       define  HC_STATE_HALT           0
 121 #       define  HC_STATE_RUNNING        (__ACTIVE)
 122 #       define  HC_STATE_QUIESCING      (__SUSPEND|__TRANSIENT|__ACTIVE)
 123 #       define  HC_STATE_RESUMING       (__SUSPEND|__TRANSIENT)
 124 #       define  HC_STATE_SUSPENDED      (__SUSPEND)
 125
 126 #define HC_IS_RUNNING(state) ((state) & __ACTIVE)
 127 #define HC_IS_SUSPENDED(state) ((state) & __SUSPEND)
 128
 129         /* more shared queuing code would be good; it should support
 130          * smarter scheduling, handle transaction translators, etc;
 131          * input size of periodic table to an interrupt scheduler.
 132          * (ohci 32, uhci 1024, ehci 256/512/1024).
 133          */
 134
 135         /* The HC driver's private data is stored at the end of
 136          * this structure.
 137          */
 138         unsigned long hcd_priv[0]
 139                         __attribute__ ((aligned(sizeof(unsigned long))));
 140 };
 141
 142 /* 2.4 does this a bit differently ... */
 143 static inline struct usb_bus *hcd_to_bus(struct usb_hcd *hcd)
 144 {
 145         return &hcd->self;
 146 }
 147
 148 static inline struct usb_hcd *bus_to_hcd(struct usb_bus *bus)
 149 {
 150         return container_of(bus, struct usb_hcd, self);
 151 }
 152
 153 struct hcd_timeout {    /* timeouts we allocate */
 154         struct list_head        timeout_list;
 155         struct timer_list       timer;
 156 };
 157
 158 /*-------------------------------------------------------------------------*/
 159
 160
 161 struct hc_driver {
 162         const char      *description;   /* "ehci-hcd" etc */
 163         const char      *product_desc;  /* product/vendor string */
 164         size_t          hcd_priv_size;  /* size of private data */
 165
 166         /* irq handler */
 167         irqreturn_t     (*irq) (struct usb_hcd *hcd);
 168
 169         int     flags;
 170 #define HCD_MEMORY      0x0001          /* HC regs use memory (else I/O) */
 171 #define HCD_LOCAL_MEM   0x0002          /* HC needs local memory */
 172 #define HCD_USB11       0x0010          /* USB 1.1 */
 173 #define HCD_USB2        0x0020          /* USB 2.0 */
 174
 175         /* called to init HCD and root hub */
 176         int     (*reset) (struct usb_hcd *hcd);
 177         int     (*start) (struct usb_hcd *hcd);
 178
 179         /* NOTE:  these suspend/resume calls relate to the HC as
 180          * a whole, not just the root hub; they're for PCI bus glue.
 181          */
 182         /* called after suspending the hub, before entering D3 etc */
 183         int     (*pci_suspend) (struct usb_hcd *hcd, pm_message_t message);
 184
 185         /* called after entering D0 (etc), before resuming the hub */
 186         int     (*pci_resume) (struct usb_hcd *hcd);
 187
 188         /* cleanly make HCD stop writing memory and doing I/O */
 189         void    (*stop) (struct usb_hcd *hcd);
 190
 191         /* shutdown HCD */
 192         void    (*shutdown) (struct usb_hcd *hcd);
 193
 194         /* return current frame number */
 195         int     (*get_frame_number) (struct usb_hcd *hcd);
 196
 197         /* manage i/o requests, device state */
 198         int     (*urb_enqueue)(struct usb_hcd *hcd,
 199                                 struct urb *urb, gfp_t mem_flags);
 200         int     (*urb_dequeue)(struct usb_hcd *hcd,
 201                                 struct urb *urb, int status);
 202
 203         /* hw synch, freeing endpoint resources that urb_dequeue can't */
 204         void    (*endpoint_disable)(struct usb_hcd *hcd,
 205                         struct usb_host_endpoint *ep);
 206
 207         /* root hub support */
 208         int     (*hub_status_data) (struct usb_hcd *hcd, char *buf);
 209         int     (*hub_control) (struct usb_hcd *hcd,
 210                                 u16 typeReq, u16 wValue, u16 wIndex,
 211                                 char *buf, u16 wLength);
 212         int     (*bus_suspend)(struct usb_hcd *);
 213         int     (*bus_resume)(struct usb_hcd *);
 214         int     (*start_port_reset)(struct usb_hcd *, unsigned port_num);
 215
 216                 /* force handover of high-speed port to full-speed companion */
 217         void    (*relinquish_port)(struct usb_hcd *, int);
 218                 /* has a port been handed over to a companion? */
 219         int     (*port_handed_over)(struct usb_hcd *, int);
 220 };
 221
 222 extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
 223 extern int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
 224                 int status);
 225 extern void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb);
 226
 227 extern int usb_hcd_submit_urb(struct urb *urb, gfp_t mem_flags);
 228 extern int usb_hcd_unlink_urb(struct urb *urb, int status);
 229 extern void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb,
 230                 int status);
 231 extern void usb_hcd_flush_endpoint(struct usb_device *udev,
 232                 struct usb_host_endpoint *ep);
 233 extern void usb_hcd_disable_endpoint(struct usb_device *udev,
 234                 struct usb_host_endpoint *ep);
 235 extern void usb_hcd_synchronize_unlinks(struct usb_device *udev);
 236 extern int usb_hcd_get_frame_number(struct usb_device *udev);
 237
 238 extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
 239                 struct device *dev, const char *bus_name);
 240 extern struct usb_hcd *usb_get_hcd(struct usb_hcd *hcd);
 241 extern void usb_put_hcd(struct usb_hcd *hcd);
 242 extern int usb_add_hcd(struct usb_hcd *hcd,
 243                 unsigned int irqnum, unsigned long irqflags);
 244 extern void usb_remove_hcd(struct usb_hcd *hcd);
 245
 246 struct platform_device;
 247 extern void usb_hcd_platform_shutdown(struct platform_device *dev);
 248
 249 #ifdef CONFIG_PCI
 250 struct pci_dev;
 251 struct pci_device_id;
 252 extern int usb_hcd_pci_probe(struct pci_dev *dev,
 253                                 const struct pci_device_id *id);
 254 extern void usb_hcd_pci_remove(struct pci_dev *dev);
 255
 256 #ifdef CONFIG_PM
 257 extern int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t state);
 258 extern int usb_hcd_pci_resume(struct pci_dev *dev);
 259 #endif /* CONFIG_PM */
 260
 261 extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
 262
 263 #endif /* CONFIG_PCI */
 264
 265 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
 266 int hcd_buffer_create(struct usb_hcd *hcd);
 267 void hcd_buffer_destroy(struct usb_hcd *hcd);
 268
 269 void *hcd_buffer_alloc(struct usb_bus *bus, size_t size,
 270         gfp_t mem_flags, dma_addr_t *dma);
 271 void hcd_buffer_free(struct usb_bus *bus, size_t size,
 272         void *addr, dma_addr_t dma);
 273
 274 /* generic bus glue, needed for host controllers that don't use PCI */
 275 extern irqreturn_t usb_hcd_irq(int irq, void *__hcd);
 276
 277 extern void usb_hc_died(struct usb_hcd *hcd);
 278 extern void usb_hcd_poll_rh_status(struct usb_hcd *hcd);
 279
 280 /* -------------------------------------------------------------------------- */
 281
 282 /* Enumeration is only for the hub driver, or HCD virtual root hubs */
 283 extern struct usb_device *usb_alloc_dev(struct usb_device *parent,
 284                                         struct usb_bus *, unsigned port);
 285 extern int usb_new_device(struct usb_device *dev);
 286 extern void usb_disconnect(struct usb_device **);
 287
 288 extern int usb_get_configuration(struct usb_device *dev);
 289 extern void usb_destroy_configuration(struct usb_device *dev);
 290
 291 /*-------------------------------------------------------------------------*/
 292
 293 /*
 294  * HCD Root Hub support
 295  */
 296
 297 #include "hub.h"
 298
 299 /* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
 300 #define DeviceRequest \
 301         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
 302 #define DeviceOutRequest \
 303         ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
 304
 305 #define InterfaceRequest \
 306         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 307
 308 #define EndpointRequest \
 309         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 310 #define EndpointOutRequest \
 311         ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 312
 313 /* class requests from the USB 2.0 hub spec, table 11-15 */
 314 /* GetBusState and SetHubDescriptor are optional, omitted */
 315 #define ClearHubFeature         (0x2000 | USB_REQ_CLEAR_FEATURE)
 316 #define ClearPortFeature        (0x2300 | USB_REQ_CLEAR_FEATURE)
 317 #define GetHubDescriptor        (0xa000 | USB_REQ_GET_DESCRIPTOR)
 318 #define GetHubStatus            (0xa000 | USB_REQ_GET_STATUS)
 319 #define GetPortStatus           (0xa300 | USB_REQ_GET_STATUS)
 320 #define SetHubFeature           (0x2000 | USB_REQ_SET_FEATURE)
 321 #define SetPortFeature          (0x2300 | USB_REQ_SET_FEATURE)
 322
 323
 324 /*-------------------------------------------------------------------------*/
 325
 326 /*
 327  * Generic bandwidth allocation constants/support
 328  */
 329 #define FRAME_TIME_USECS        1000L
 330 #define BitTime(bytecount) (7 * 8 * bytecount / 6) /* with integer truncation */
 331                 /* Trying not to use worst-case bit-stuffing
 332                  * of (7/6 * 8 * bytecount) = 9.33 * bytecount */
 333                 /* bytecount = data payload byte count */
 334
 335 #define NS_TO_US(ns)    ((ns + 500L) / 1000L)
 336                         /* convert & round nanoseconds to microseconds */
 337
 338
 339 /*
 340  * Full/low speed bandwidth allocation constants/support.
 341  */
 342 #define BW_HOST_DELAY   1000L           /* nanoseconds */
 343 #define BW_HUB_LS_SETUP 333L            /* nanoseconds */
 344                         /* 4 full-speed bit times (est.) */
 345
 346 #define FRAME_TIME_BITS                 12000L  /* frame = 1 millisecond */
 347 #define FRAME_TIME_MAX_BITS_ALLOC       (90L * FRAME_TIME_BITS / 100L)
 348 #define FRAME_TIME_MAX_USECS_ALLOC      (90L * FRAME_TIME_USECS / 100L)
 349
 350 /*
 351  * Ceiling [nano/micro]seconds (typical) for that many bytes at high speed
 352  * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
 353  * to preallocate bandwidth)
 354  */
 355 #define USB2_HOST_DELAY 5       /* nsec, guess */
 356 #define HS_NSECS(bytes) (((55 * 8 * 2083) \
 357         + (2083UL * (3 + BitTime(bytes))))/1000 \
 358         + USB2_HOST_DELAY)
 359 #define HS_NSECS_ISO(bytes) (((38 * 8 * 2083) \
 360         + (2083UL * (3 + BitTime(bytes))))/1000 \
 361         + USB2_HOST_DELAY)
 362 #define HS_USECS(bytes) NS_TO_US (HS_NSECS(bytes))
 363 #define HS_USECS_ISO(bytes) NS_TO_US (HS_NSECS_ISO(bytes))
 364
 365 extern long usb_calc_bus_time(int speed, int is_input,
 366                         int isoc, int bytecount);
 367
 368 /*-------------------------------------------------------------------------*/
 369
 370 extern void usb_set_device_state(struct usb_device *udev,
 371                 enum usb_device_state new_state);
 372
 373 /*-------------------------------------------------------------------------*/
 374
 375 /* exported only within usbcore */
 376
 377 extern struct list_head usb_bus_list;
 378 extern struct mutex usb_bus_list_lock;
 379 extern wait_queue_head_t usb_kill_urb_queue;
 380
 381 extern int usb_find_interface_driver(struct usb_device *dev,
 382         struct usb_interface *interface);
 383
 384 #define usb_endpoint_out(ep_dir)        (!((ep_dir) & USB_DIR_IN))
 385
 386 #ifdef CONFIG_PM
 387 extern void usb_hcd_resume_root_hub(struct usb_hcd *hcd);
 388 extern void usb_root_hub_lost_power(struct usb_device *rhdev);
 389 extern int hcd_bus_suspend(struct usb_device *rhdev);
 390 extern int hcd_bus_resume(struct usb_device *rhdev);
 391 #else
 392 static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
 393 {
 394         return;
 395 }
 396 #endif /* CONFIG_PM */
 397
 398 /*
 399  * USB device fs stuff
 400  */
 401
 402 #ifdef CONFIG_USB_DEVICEFS
 403
 404 /*
 405  * these are expected to be called from the USB core/hub thread
 406  * with the kernel lock held
 407  */
 408 extern void usbfs_update_special(void);
 409 extern int usbfs_init(void);
 410 extern void usbfs_cleanup(void);
 411
 412 #else /* CONFIG_USB_DEVICEFS */
 413
 414 static inline void usbfs_update_special(void) {}
 415 static inline int usbfs_init(void) { return 0; }
 416 static inline void usbfs_cleanup(void) { }
 417
 418 #endif /* CONFIG_USB_DEVICEFS */
 419
 420 /*-------------------------------------------------------------------------*/
 421
 422 #if defined(CONFIG_USB_MON)
 423
 424 struct usb_mon_operations {
 425         void (*urb_submit)(struct usb_bus *bus, struct urb *urb);
 426         void (*urb_submit_error)(struct usb_bus *bus, struct urb *urb, int err);
 427         void (*urb_complete)(struct usb_bus *bus, struct urb *urb, int status);
 428         /* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
 429 };
 430
 431 extern struct usb_mon_operations *mon_ops;
 432
 433 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb)
 434 {
 435         if (bus->monitored)
 436                 (*mon_ops->urb_submit)(bus, urb);
 437 }
 438
 439 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
 440     int error)
 441 {
 442         if (bus->monitored)
 443                 (*mon_ops->urb_submit_error)(bus, urb, error);
 444 }
 445
 446 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
 447                 int status)
 448 {
 449         if (bus->monitored)
 450                 (*mon_ops->urb_complete)(bus, urb, status);
 451 }
 452
 453 int usb_mon_register(struct usb_mon_operations *ops);
 454 void usb_mon_deregister(void);
 455
 456 #else
 457
 458 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb) {}
 459 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
 460     int error) {}
 461 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
 462                 int status) {}
 463
 464 #endif /* CONFIG_USB_MON */
 465
 466 /*-------------------------------------------------------------------------*/
 467
 468 /* hub.h ... DeviceRemovable in 2.4.2-ac11, gone in 2.4.10 */
 469 /* bleech -- resurfaced in 2.4.11 or 2.4.12 */
 470 #define bitmap  DeviceRemovable
 471
 472
 473 /*-------------------------------------------------------------------------*/
 474
 475 /* random stuff */
 476
 477 #define RUN_CONTEXT (in_irq() ? "in_irq" \
 478                 : (in_interrupt() ? "in_interrupt" : "can sleep"))
 479
 480
 481 /* This rwsem is for use only by the hub driver and ehci-hcd.
 482  * Nobody else should touch it.
 483  */
 484 extern struct rw_semaphore ehci_cf_port_reset_rwsem;
 485
 486 /* Keep track of which host controller drivers are loaded */
 487 #define USB_UHCI_LOADED         0
 488 #define USB_OHCI_LOADED         1
 489 #define USB_EHCI_LOADED         2
 490 extern unsigned long usb_hcds_loaded;
 491
 492 #endif /* __KERNEL__ */