include/linux/usb/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 #ifndef __USB_CORE_HCD_H
  20 #define __USB_CORE_HCD_H
  21
  22 #ifdef __KERNEL__
  23
  24 #include <linux/rwsem.h>
  25 #include <linux/interrupt.h>
  26
  27 #define MAX_TOPO_LEVEL          6
  28
  29 /* This file contains declarations of usbcore internals that are mostly
  30  * used or exposed by Host Controller Drivers.
  31  */
  32
  33 /*
  34  * USB Packet IDs (PIDs)
  35  */
  36 #define USB_PID_EXT                     0xf0    /* USB 2.0 LPM ECN */
  37 #define USB_PID_OUT                     0xe1
  38 #define USB_PID_ACK                     0xd2
  39 #define USB_PID_DATA0                   0xc3
  40 #define USB_PID_PING                    0xb4    /* USB 2.0 */
  41 #define USB_PID_SOF                     0xa5
  42 #define USB_PID_NYET                    0x96    /* USB 2.0 */
  43 #define USB_PID_DATA2                   0x87    /* USB 2.0 */
  44 #define USB_PID_SPLIT                   0x78    /* USB 2.0 */
  45 #define USB_PID_IN                      0x69
  46 #define USB_PID_NAK                     0x5a
  47 #define USB_PID_DATA1                   0x4b
  48 #define USB_PID_PREAMBLE                0x3c    /* Token mode */
  49 #define USB_PID_ERR                     0x3c    /* USB 2.0: handshake mode */
  50 #define USB_PID_SETUP                   0x2d
  51 #define USB_PID_STALL                   0x1e
  52 #define USB_PID_MDATA                   0x0f    /* USB 2.0 */
  53
  54 /*-------------------------------------------------------------------------*/
  55
  56 /*
  57  * USB Host Controller Driver (usb_hcd) framework
  58  *
  59  * Since "struct usb_bus" is so thin, you can't share much code in it.
  60  * This framework is a layer over that, and should be more sharable.
  61  *
  62  * @authorized_default: Specifies if new devices are authorized to
  63  *                      connect by default or they require explicit
  64  *                      user space authorization; this bit is settable
  65  *                      through /sys/class/usb_host/X/authorized_default.
  66  *                      For the rest is RO, so we don't lock to r/w it.
  67  */
  68
  69 /*-------------------------------------------------------------------------*/
  70
  71 struct giveback_urb_bh {
  72         bool running;
  73         spinlock_t lock;
  74         struct list_head  head;
  75         struct tasklet_struct bh;
  76         struct usb_host_endpoint *completing_ep;
  77 };
  78
  79 struct usb_hcd {
  80
  81         /*
  82          * housekeeping
  83          */
  84         struct usb_bus          self;           /* hcd is-a bus */
  85         struct kref             kref;           /* reference counter */
  86
  87         const char              *product_desc;  /* product/vendor string */
  88         int                     speed;          /* Speed for this roothub.
  89                                                  * May be different from
  90                                                  * hcd->driver->flags & HCD_MASK
  91                                                  */
  92         char                    irq_descr[24];  /* driver + bus # */
  93
  94         struct timer_list       rh_timer;       /* drives root-hub polling */
  95         struct urb              *status_urb;    /* the current status urb */
  96 #ifdef CONFIG_PM_RUNTIME
  97         struct work_struct      wakeup_work;    /* for remote wakeup */
  98 #endif
  99
 100         /*
 101          * hardware info/state
 102          */
 103         const struct hc_driver  *driver;        /* hw-specific hooks */
 104
 105         /*
 106          * OTG and some Host controllers need software interaction with phys;
 107          * other external phys should be software-transparent
 108          */
 109         struct usb_phy  *phy;
 110
 111         /* Flags that need to be manipulated atomically because they can
 112          * change while the host controller is running.  Always use
 113          * set_bit() or clear_bit() to change their values.
 114          */
 115         unsigned long           flags;
 116 #define HCD_FLAG_HW_ACCESSIBLE          0       /* at full power */
 117 #define HCD_FLAG_POLL_RH                2       /* poll for rh status? */
 118 #define HCD_FLAG_POLL_PENDING           3       /* status has changed? */
 119 #define HCD_FLAG_WAKEUP_PENDING         4       /* root hub is resuming? */
 120 #define HCD_FLAG_RH_RUNNING             5       /* root hub is running? */
 121 #define HCD_FLAG_DEAD                   6       /* controller has died? */
 122
 123         /* The flags can be tested using these macros; they are likely to
 124          * be slightly faster than test_bit().
 125          */
 126 #define HCD_HW_ACCESSIBLE(hcd)  ((hcd)->flags & (1U << HCD_FLAG_HW_ACCESSIBLE))
 127 #define HCD_POLL_RH(hcd)        ((hcd)->flags & (1U << HCD_FLAG_POLL_RH))
 128 #define HCD_POLL_PENDING(hcd)   ((hcd)->flags & (1U << HCD_FLAG_POLL_PENDING))
 129 #define HCD_WAKEUP_PENDING(hcd) ((hcd)->flags & (1U << HCD_FLAG_WAKEUP_PENDING))
 130 #define HCD_RH_RUNNING(hcd)     ((hcd)->flags & (1U << HCD_FLAG_RH_RUNNING))
 131 #define HCD_DEAD(hcd)           ((hcd)->flags & (1U << HCD_FLAG_DEAD))
 132
 133         /* Flags that get set only during HCD registration or removal. */
 134         unsigned                rh_registered:1;/* is root hub registered? */
 135         unsigned                rh_pollable:1;  /* may we poll the root hub? */
 136         unsigned                msix_enabled:1; /* driver has MSI-X enabled? */
 137         unsigned                remove_phy:1;   /* auto-remove USB phy */
 138
 139         /* The next flag is a stopgap, to be removed when all the HCDs
 140          * support the new root-hub polling mechanism. */
 141         unsigned                uses_new_polling:1;
 142         unsigned                wireless:1;     /* Wireless USB HCD */
 143         unsigned                authorized_default:1;
 144         unsigned                has_tt:1;       /* Integrated TT in root hub */
 145         unsigned                amd_resume_bug:1; /* AMD remote wakeup quirk */
 146         unsigned                can_do_streams:1; /* HC supports streams */
 147
 148         unsigned int            irq;            /* irq allocated */
 149         void __iomem            *regs;          /* device memory/io */
 150         resource_size_t         rsrc_start;     /* memory/io resource start */
 151         resource_size_t         rsrc_len;       /* memory/io resource length */
 152         unsigned                power_budget;   /* in mA, 0 = no limit */
 153
 154         struct giveback_urb_bh  high_prio_bh;
 155         struct giveback_urb_bh  low_prio_bh;
 156
 157         /* bandwidth_mutex should be taken before adding or removing
 158          * any new bus bandwidth constraints:
 159          *   1. Before adding a configuration for a new device.
 160          *   2. Before removing the configuration to put the device into
 161          *      the addressed state.
 162          *   3. Before selecting a different configuration.
 163          *   4. Before selecting an alternate interface setting.
 164          *
 165          * bandwidth_mutex should be dropped after a successful control message
 166          * to the device, or resetting the bandwidth after a failed attempt.
 167          */
 168         struct mutex            *bandwidth_mutex;
 169         struct usb_hcd          *shared_hcd;
 170         struct usb_hcd          *primary_hcd;
 171
 172
 173 #define HCD_BUFFER_POOLS        4
 174         struct dma_pool         *pool[HCD_BUFFER_POOLS];
 175
 176         int                     state;
 177 #       define  __ACTIVE                0x01
 178 #       define  __SUSPEND               0x04
 179 #       define  __TRANSIENT             0x80
 180
 181 #       define  HC_STATE_HALT           0
 182 #       define  HC_STATE_RUNNING        (__ACTIVE)
 183 #       define  HC_STATE_QUIESCING      (__SUSPEND|__TRANSIENT|__ACTIVE)
 184 #       define  HC_STATE_RESUMING       (__SUSPEND|__TRANSIENT)
 185 #       define  HC_STATE_SUSPENDED      (__SUSPEND)
 186
 187 #define HC_IS_RUNNING(state) ((state) & __ACTIVE)
 188 #define HC_IS_SUSPENDED(state) ((state) & __SUSPEND)
 189
 190         /* more shared queuing code would be good; it should support
 191          * smarter scheduling, handle transaction translators, etc;
 192          * input size of periodic table to an interrupt scheduler.
 193          * (ohci 32, uhci 1024, ehci 256/512/1024).
 194          */
 195
 196         /* The HC driver's private data is stored at the end of
 197          * this structure.
 198          */
 199         unsigned long hcd_priv[0]
 200                         __attribute__ ((aligned(sizeof(s64))));
 201 };
 202
 203 /* 2.4 does this a bit differently ... */
 204 static inline struct usb_bus *hcd_to_bus(struct usb_hcd *hcd)
 205 {
 206         return &hcd->self;
 207 }
 208
 209 static inline struct usb_hcd *bus_to_hcd(struct usb_bus *bus)
 210 {
 211         return container_of(bus, struct usb_hcd, self);
 212 }
 213
 214 struct hcd_timeout {    /* timeouts we allocate */
 215         struct list_head        timeout_list;
 216         struct timer_list       timer;
 217 };
 218
 219 /*-------------------------------------------------------------------------*/
 220
 221
 222 struct hc_driver {
 223         const char      *description;   /* "ehci-hcd" etc */
 224         const char      *product_desc;  /* product/vendor string */
 225         size_t          hcd_priv_size;  /* size of private data */
 226
 227         /* irq handler */
 228         irqreturn_t     (*irq) (struct usb_hcd *hcd);
 229
 230         int     flags;
 231 #define HCD_MEMORY      0x0001          /* HC regs use memory (else I/O) */
 232 #define HCD_LOCAL_MEM   0x0002          /* HC needs local memory */
 233 #define HCD_SHARED      0x0004          /* Two (or more) usb_hcds share HW */
 234 #define HCD_USB11       0x0010          /* USB 1.1 */
 235 #define HCD_USB2        0x0020          /* USB 2.0 */
 236 #define HCD_USB25       0x0030          /* Wireless USB 1.0 (USB 2.5)*/
 237 #define HCD_USB3        0x0040          /* USB 3.0 */
 238 #define HCD_MASK        0x0070
 239 #define HCD_BH          0x0100          /* URB complete in BH context */
 240
 241         /* called to init HCD and root hub */
 242         int     (*reset) (struct usb_hcd *hcd);
 243         int     (*start) (struct usb_hcd *hcd);
 244
 245         /* NOTE:  these suspend/resume calls relate to the HC as
 246          * a whole, not just the root hub; they're for PCI bus glue.
 247          */
 248         /* called after suspending the hub, before entering D3 etc */
 249         int     (*pci_suspend)(struct usb_hcd *hcd, bool do_wakeup);
 250
 251         /* called after entering D0 (etc), before resuming the hub */
 252         int     (*pci_resume)(struct usb_hcd *hcd, bool hibernated);
 253
 254         /* cleanly make HCD stop writing memory and doing I/O */
 255         void    (*stop) (struct usb_hcd *hcd);
 256
 257         /* shutdown HCD */
 258         void    (*shutdown) (struct usb_hcd *hcd);
 259
 260         /* return current frame number */
 261         int     (*get_frame_number) (struct usb_hcd *hcd);
 262
 263         /* manage i/o requests, device state */
 264         int     (*urb_enqueue)(struct usb_hcd *hcd,
 265                                 struct urb *urb, gfp_t mem_flags);
 266         int     (*urb_dequeue)(struct usb_hcd *hcd,
 267                                 struct urb *urb, int status);
 268
 269         /*
 270          * (optional) these hooks allow an HCD to override the default DMA
 271          * mapping and unmapping routines.  In general, they shouldn't be
 272          * necessary unless the host controller has special DMA requirements,
 273          * such as alignment contraints.  If these are not specified, the
 274          * general usb_hcd_(un)?map_urb_for_dma functions will be used instead
 275          * (and it may be a good idea to call these functions in your HCD
 276          * implementation)
 277          */
 278         int     (*map_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb,
 279                                    gfp_t mem_flags);
 280         void    (*unmap_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb);
 281
 282         /* hw synch, freeing endpoint resources that urb_dequeue can't */
 283         void    (*endpoint_disable)(struct usb_hcd *hcd,
 284                         struct usb_host_endpoint *ep);
 285
 286         /* (optional) reset any endpoint state such as sequence number
 287            and current window */
 288         void    (*endpoint_reset)(struct usb_hcd *hcd,
 289                         struct usb_host_endpoint *ep);
 290
 291         /* root hub support */
 292         int     (*hub_status_data) (struct usb_hcd *hcd, char *buf);
 293         int     (*hub_control) (struct usb_hcd *hcd,
 294                                 u16 typeReq, u16 wValue, u16 wIndex,
 295                                 char *buf, u16 wLength);
 296         int     (*bus_suspend)(struct usb_hcd *);
 297         int     (*bus_resume)(struct usb_hcd *);
 298         int     (*start_port_reset)(struct usb_hcd *, unsigned port_num);
 299
 300                 /* force handover of high-speed port to full-speed companion */
 301         void    (*relinquish_port)(struct usb_hcd *, int);
 302                 /* has a port been handed over to a companion? */
 303         int     (*port_handed_over)(struct usb_hcd *, int);
 304
 305                 /* CLEAR_TT_BUFFER completion callback */
 306         void    (*clear_tt_buffer_complete)(struct usb_hcd *,
 307                                 struct usb_host_endpoint *);
 308
 309         /* xHCI specific functions */
 310                 /* Called by usb_alloc_dev to alloc HC device structures */
 311         int     (*alloc_dev)(struct usb_hcd *, struct usb_device *);
 312                 /* Called by usb_disconnect to free HC device structures */
 313         void    (*free_dev)(struct usb_hcd *, struct usb_device *);
 314         /* Change a group of bulk endpoints to support multiple stream IDs */
 315         int     (*alloc_streams)(struct usb_hcd *hcd, struct usb_device *udev,
 316                 struct usb_host_endpoint **eps, unsigned int num_eps,
 317                 unsigned int num_streams, gfp_t mem_flags);
 318         /* Reverts a group of bulk endpoints back to not using stream IDs.
 319          * Can fail if we run out of memory.
 320          */
 321         int     (*free_streams)(struct usb_hcd *hcd, struct usb_device *udev,
 322                 struct usb_host_endpoint **eps, unsigned int num_eps,
 323                 gfp_t mem_flags);
 324
 325         /* Bandwidth computation functions */
 326         /* Note that add_endpoint() can only be called once per endpoint before
 327          * check_bandwidth() or reset_bandwidth() must be called.
 328          * drop_endpoint() can only be called once per endpoint also.
 329          * A call to xhci_drop_endpoint() followed by a call to
 330          * xhci_add_endpoint() will add the endpoint to the schedule with
 331          * possibly new parameters denoted by a different endpoint descriptor
 332          * in usb_host_endpoint.  A call to xhci_add_endpoint() followed by a
 333          * call to xhci_drop_endpoint() is not allowed.
 334          */
 335                 /* Allocate endpoint resources and add them to a new schedule */
 336         int     (*add_endpoint)(struct usb_hcd *, struct usb_device *,
 337                                 struct usb_host_endpoint *);
 338                 /* Drop an endpoint from a new schedule */
 339         int     (*drop_endpoint)(struct usb_hcd *, struct usb_device *,
 340                                  struct usb_host_endpoint *);
 341                 /* Check that a new hardware configuration, set using
 342                  * endpoint_enable and endpoint_disable, does not exceed bus
 343                  * bandwidth.  This must be called before any set configuration
 344                  * or set interface requests are sent to the device.
 345                  */
 346         int     (*check_bandwidth)(struct usb_hcd *, struct usb_device *);
 347                 /* Reset the device schedule to the last known good schedule,
 348                  * which was set from a previous successful call to
 349                  * check_bandwidth().  This reverts any add_endpoint() and
 350                  * drop_endpoint() calls since that last successful call.
 351                  * Used for when a check_bandwidth() call fails due to resource
 352                  * or bandwidth constraints.
 353                  */
 354         void    (*reset_bandwidth)(struct usb_hcd *, struct usb_device *);
 355                 /* Returns the hardware-chosen device address */
 356         int     (*address_device)(struct usb_hcd *, struct usb_device *udev);
 357                 /* prepares the hardware to send commands to the device */
 358         int     (*enable_device)(struct usb_hcd *, struct usb_device *udev);
 359                 /* Notifies the HCD after a hub descriptor is fetched.
 360                  * Will block.
 361                  */
 362         int     (*update_hub_device)(struct usb_hcd *, struct usb_device *hdev,
 363                         struct usb_tt *tt, gfp_t mem_flags);
 364         int     (*reset_device)(struct usb_hcd *, struct usb_device *);
 365                 /* Notifies the HCD after a device is connected and its
 366                  * address is set
 367                  */
 368         int     (*update_device)(struct usb_hcd *, struct usb_device *);
 369         int     (*set_usb2_hw_lpm)(struct usb_hcd *, struct usb_device *, int);
 370         /* USB 3.0 Link Power Management */
 371                 /* Returns the USB3 hub-encoded value for the U1/U2 timeout. */
 372         int     (*enable_usb3_lpm_timeout)(struct usb_hcd *,
 373                         struct usb_device *, enum usb3_link_state state);
 374                 /* The xHCI host controller can still fail the command to
 375                  * disable the LPM timeouts, so this can return an error code.
 376                  */
 377         int     (*disable_usb3_lpm_timeout)(struct usb_hcd *,
 378                         struct usb_device *, enum usb3_link_state state);
 379         int     (*find_raw_port_number)(struct usb_hcd *, int);
 380 };
 381
 382 static inline int hcd_giveback_urb_in_bh(struct usb_hcd *hcd)
 383 {
 384         return hcd->driver->flags & HCD_BH;
 385 }
 386
 387 static inline bool hcd_periodic_completion_in_progress(struct usb_hcd *hcd,
 388                 struct usb_host_endpoint *ep)
 389 {
 390         return hcd->high_prio_bh.completing_ep == ep;
 391 }
 392
 393 extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
 394 extern int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
 395                 int status);
 396 extern void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb);
 397
 398 extern int usb_hcd_submit_urb(struct urb *urb, gfp_t mem_flags);
 399 extern int usb_hcd_unlink_urb(struct urb *urb, int status);
 400 extern void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb,
 401                 int status);
 402 extern int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
 403                 gfp_t mem_flags);
 404 extern void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *, struct urb *);
 405 extern void usb_hcd_unmap_urb_for_dma(struct usb_hcd *, struct urb *);
 406 extern void usb_hcd_flush_endpoint(struct usb_device *udev,
 407                 struct usb_host_endpoint *ep);
 408 extern void usb_hcd_disable_endpoint(struct usb_device *udev,
 409                 struct usb_host_endpoint *ep);
 410 extern void usb_hcd_reset_endpoint(struct usb_device *udev,
 411                 struct usb_host_endpoint *ep);
 412 extern void usb_hcd_synchronize_unlinks(struct usb_device *udev);
 413 extern int usb_hcd_alloc_bandwidth(struct usb_device *udev,
 414                 struct usb_host_config *new_config,
 415                 struct usb_host_interface *old_alt,
 416                 struct usb_host_interface *new_alt);
 417 extern int usb_hcd_get_frame_number(struct usb_device *udev);
 418
 419 extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
 420                 struct device *dev, const char *bus_name);
 421 extern struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
 422                 struct device *dev, const char *bus_name,
 423                 struct usb_hcd *shared_hcd);
 424 extern struct usb_hcd *usb_get_hcd(struct usb_hcd *hcd);
 425 extern void usb_put_hcd(struct usb_hcd *hcd);
 426 extern int usb_hcd_is_primary_hcd(struct usb_hcd *hcd);
 427 extern int usb_add_hcd(struct usb_hcd *hcd,
 428                 unsigned int irqnum, unsigned long irqflags);
 429 extern void usb_remove_hcd(struct usb_hcd *hcd);
 430 extern int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1);
 431
 432 struct platform_device;
 433 extern void usb_hcd_platform_shutdown(struct platform_device *dev);
 434
 435 #ifdef CONFIG_PCI
 436 struct pci_dev;
 437 struct pci_device_id;
 438 extern int usb_hcd_pci_probe(struct pci_dev *dev,
 439                                 const struct pci_device_id *id);
 440 extern void usb_hcd_pci_remove(struct pci_dev *dev);
 441 extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
 442
 443 extern int usb_hcd_amd_remote_wakeup_quirk(struct pci_dev *dev);
 444
 445 #ifdef CONFIG_PM
 446 extern const struct dev_pm_ops usb_hcd_pci_pm_ops;
 447 #endif
 448 #endif /* CONFIG_PCI */
 449
 450 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
 451 int hcd_buffer_create(struct usb_hcd *hcd);
 452 void hcd_buffer_destroy(struct usb_hcd *hcd);
 453
 454 void *hcd_buffer_alloc(struct usb_bus *bus, size_t size,
 455         gfp_t mem_flags, dma_addr_t *dma);
 456 void hcd_buffer_free(struct usb_bus *bus, size_t size,
 457         void *addr, dma_addr_t dma);
 458
 459 /* generic bus glue, needed for host controllers that don't use PCI */
 460 extern irqreturn_t usb_hcd_irq(int irq, void *__hcd);
 461
 462 extern void usb_hc_died(struct usb_hcd *hcd);
 463 extern void usb_hcd_poll_rh_status(struct usb_hcd *hcd);
 464 extern void usb_wakeup_notification(struct usb_device *hdev,
 465                 unsigned int portnum);
 466
 467 extern void usb_hcd_start_port_resume(struct usb_bus *bus, int portnum);
 468 extern void usb_hcd_end_port_resume(struct usb_bus *bus, int portnum);
 469
 470 /* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
 471 #define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
 472 #define usb_dotoggle(dev, ep, out)  ((dev)->toggle[out] ^= (1 << (ep)))
 473 #define usb_settoggle(dev, ep, out, bit) \
 474                 ((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | \
 475                  ((bit) << (ep)))
 476
 477 /* -------------------------------------------------------------------------- */
 478
 479 /* Enumeration is only for the hub driver, or HCD virtual root hubs */
 480 extern struct usb_device *usb_alloc_dev(struct usb_device *parent,
 481                                         struct usb_bus *, unsigned port);
 482 extern int usb_new_device(struct usb_device *dev);
 483 extern void usb_disconnect(struct usb_device **);
 484
 485 extern int usb_get_configuration(struct usb_device *dev);
 486 extern void usb_destroy_configuration(struct usb_device *dev);
 487
 488 /*-------------------------------------------------------------------------*/
 489
 490 /*
 491  * HCD Root Hub support
 492  */
 493
 494 #include <linux/usb/ch11.h>
 495
 496 /*
 497  * As of USB 2.0, full/low speed devices are segregated into trees.
 498  * One type grows from USB 1.1 host controllers (OHCI, UHCI etc).
 499  * The other type grows from high speed hubs when they connect to
 500  * full/low speed devices using "Transaction Translators" (TTs).
 501  *
 502  * TTs should only be known to the hub driver, and high speed bus
 503  * drivers (only EHCI for now).  They affect periodic scheduling and
 504  * sometimes control/bulk error recovery.
 505  */
 506
 507 struct usb_device;
 508
 509 struct usb_tt {
 510         struct usb_device       *hub;   /* upstream highspeed hub */
 511         int                     multi;  /* true means one TT per port */
 512         unsigned                think_time;     /* think time in ns */
 513         void                    *hcpriv;        /* HCD private data */
 514
 515         /* for control/bulk error recovery (CLEAR_TT_BUFFER) */
 516         spinlock_t              lock;
 517         struct list_head        clear_list;     /* of usb_tt_clear */
 518         struct work_struct      clear_work;
 519 };
 520
 521 struct usb_tt_clear {
 522         struct list_head        clear_list;
 523         unsigned                tt;
 524         u16                     devinfo;
 525         struct usb_hcd          *hcd;
 526         struct usb_host_endpoint        *ep;
 527 };
 528
 529 extern int usb_hub_clear_tt_buffer(struct urb *urb);
 530 extern void usb_ep0_reinit(struct usb_device *);
 531
 532 /* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
 533 #define DeviceRequest \
 534         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
 535 #define DeviceOutRequest \
 536         ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
 537
 538 #define InterfaceRequest \
 539         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 540
 541 #define EndpointRequest \
 542         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 543 #define EndpointOutRequest \
 544         ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 545
 546 /* class requests from the USB 2.0 hub spec, table 11-15 */
 547 /* GetBusState and SetHubDescriptor are optional, omitted */
 548 #define ClearHubFeature         (0x2000 | USB_REQ_CLEAR_FEATURE)
 549 #define ClearPortFeature        (0x2300 | USB_REQ_CLEAR_FEATURE)
 550 #define GetHubDescriptor        (0xa000 | USB_REQ_GET_DESCRIPTOR)
 551 #define GetHubStatus            (0xa000 | USB_REQ_GET_STATUS)
 552 #define GetPortStatus           (0xa300 | USB_REQ_GET_STATUS)
 553 #define SetHubFeature           (0x2000 | USB_REQ_SET_FEATURE)
 554 #define SetPortFeature          (0x2300 | USB_REQ_SET_FEATURE)
 555
 556
 557 /*-------------------------------------------------------------------------*/
 558
 559 /* class requests from USB 3.0 hub spec, table 10-5 */
 560 #define SetHubDepth             (0x3000 | HUB_SET_DEPTH)
 561 #define GetPortErrorCount       (0x8000 | HUB_GET_PORT_ERR_COUNT)
 562
 563 /*
 564  * Generic bandwidth allocation constants/support
 565  */
 566 #define FRAME_TIME_USECS        1000L
 567 #define BitTime(bytecount) (7 * 8 * bytecount / 6) /* with integer truncation */
 568                 /* Trying not to use worst-case bit-stuffing
 569                  * of (7/6 * 8 * bytecount) = 9.33 * bytecount */
 570                 /* bytecount = data payload byte count */
 571
 572 #define NS_TO_US(ns)    DIV_ROUND_UP(ns, 1000L)
 573                         /* convert nanoseconds to microseconds, rounding up */
 574
 575 /*
 576  * Full/low speed bandwidth allocation constants/support.
 577  */
 578 #define BW_HOST_DELAY   1000L           /* nanoseconds */
 579 #define BW_HUB_LS_SETUP 333L            /* nanoseconds */
 580                         /* 4 full-speed bit times (est.) */
 581
 582 #define FRAME_TIME_BITS                 12000L  /* frame = 1 millisecond */
 583 #define FRAME_TIME_MAX_BITS_ALLOC       (90L * FRAME_TIME_BITS / 100L)
 584 #define FRAME_TIME_MAX_USECS_ALLOC      (90L * FRAME_TIME_USECS / 100L)
 585
 586 /*
 587  * Ceiling [nano/micro]seconds (typical) for that many bytes at high speed
 588  * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
 589  * to preallocate bandwidth)
 590  */
 591 #define USB2_HOST_DELAY 5       /* nsec, guess */
 592 #define HS_NSECS(bytes) (((55 * 8 * 2083) \
 593         + (2083UL * (3 + BitTime(bytes))))/1000 \
 594         + USB2_HOST_DELAY)
 595 #define HS_NSECS_ISO(bytes) (((38 * 8 * 2083) \
 596         + (2083UL * (3 + BitTime(bytes))))/1000 \
 597         + USB2_HOST_DELAY)
 598 #define HS_USECS(bytes)         NS_TO_US(HS_NSECS(bytes))
 599 #define HS_USECS_ISO(bytes)     NS_TO_US(HS_NSECS_ISO(bytes))
 600
 601 extern long usb_calc_bus_time(int speed, int is_input,
 602                         int isoc, int bytecount);
 603
 604 /*-------------------------------------------------------------------------*/
 605
 606 extern void usb_set_device_state(struct usb_device *udev,
 607                 enum usb_device_state new_state);
 608
 609 /*-------------------------------------------------------------------------*/
 610
 611 /* exported only within usbcore */
 612
 613 extern struct list_head usb_bus_list;
 614 extern struct mutex usb_bus_list_lock;
 615 extern wait_queue_head_t usb_kill_urb_queue;
 616
 617 extern int usb_find_interface_driver(struct usb_device *dev,
 618         struct usb_interface *interface);
 619
 620 #define usb_endpoint_out(ep_dir)        (!((ep_dir) & USB_DIR_IN))
 621
 622 #ifdef CONFIG_PM
 623 extern void usb_root_hub_lost_power(struct usb_device *rhdev);
 624 extern int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg);
 625 extern int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg);
 626 #endif /* CONFIG_PM */
 627
 628 #ifdef CONFIG_PM_RUNTIME
 629 extern void usb_hcd_resume_root_hub(struct usb_hcd *hcd);
 630 #else
 631 static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
 632 {
 633         return;
 634 }
 635 #endif /* CONFIG_PM_RUNTIME */
 636
 637 /*-------------------------------------------------------------------------*/
 638
 639 #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
 640
 641 struct usb_mon_operations {
 642         void (*urb_submit)(struct usb_bus *bus, struct urb *urb);
 643         void (*urb_submit_error)(struct usb_bus *bus, struct urb *urb, int err);
 644         void (*urb_complete)(struct usb_bus *bus, struct urb *urb, int status);
 645         /* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
 646 };
 647
 648 extern struct usb_mon_operations *mon_ops;
 649
 650 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb)
 651 {
 652         if (bus->monitored)
 653                 (*mon_ops->urb_submit)(bus, urb);
 654 }
 655
 656 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
 657     int error)
 658 {
 659         if (bus->monitored)
 660                 (*mon_ops->urb_submit_error)(bus, urb, error);
 661 }
 662
 663 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
 664                 int status)
 665 {
 666         if (bus->monitored)
 667                 (*mon_ops->urb_complete)(bus, urb, status);
 668 }
 669
 670 int usb_mon_register(struct usb_mon_operations *ops);
 671 void usb_mon_deregister(void);
 672
 673 #else
 674
 675 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb) {}
 676 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
 677     int error) {}
 678 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
 679                 int status) {}
 680
 681 #endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
 682
 683 /*-------------------------------------------------------------------------*/
 684
 685 /* random stuff */
 686
 687 #define RUN_CONTEXT (in_irq() ? "in_irq" \
 688                 : (in_interrupt() ? "in_interrupt" : "can sleep"))
 689
 690
 691 /* This rwsem is for use only by the hub driver and ehci-hcd.
 692  * Nobody else should touch it.
 693  */
 694 extern struct rw_semaphore ehci_cf_port_reset_rwsem;
 695
 696 /* Keep track of which host controller drivers are loaded */
 697 #define USB_UHCI_LOADED         0
 698 #define USB_OHCI_LOADED         1
 699 #define USB_EHCI_LOADED         2
 700 extern unsigned long usb_hcds_loaded;
 701
 702 #endif /* __KERNEL__ */
 703
 704 #endif /* __USB_CORE_HCD_H */