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
  63 /*-------------------------------------------------------------------------*/
  64
  65 struct giveback_urb_bh {
  66         bool running;
  67         spinlock_t lock;
  68         struct list_head  head;
  69         struct tasklet_struct bh;
  70         struct usb_host_endpoint *completing_ep;
  71 };
  72
  73 struct usb_hcd {
  74
  75         /*
  76          * housekeeping
  77          */
  78         struct usb_bus          self;           /* hcd is-a bus */
  79         struct kref             kref;           /* reference counter */
  80
  81         const char              *product_desc;  /* product/vendor string */
  82         int                     speed;          /* Speed for this roothub.
  83                                                  * May be different from
  84                                                  * hcd->driver->flags & HCD_MASK
  85                                                  */
  86         char                    irq_descr[24];  /* driver + bus # */
  87
  88         struct timer_list       rh_timer;       /* drives root-hub polling */
  89         struct urb              *status_urb;    /* the current status urb */
  90 #ifdef CONFIG_PM
  91         struct work_struct      wakeup_work;    /* for remote wakeup */
  92 #endif
  93
  94         /*
  95          * hardware info/state
  96          */
  97         const struct hc_driver  *driver;        /* hw-specific hooks */
  98
  99         /*
 100          * OTG and some Host controllers need software interaction with phys;
 101          * other external phys should be software-transparent
 102          */
 103         struct usb_phy          *usb_phy;
 104         struct phy              *phy;
 105
 106         /* Flags that need to be manipulated atomically because they can
 107          * change while the host controller is running.  Always use
 108          * set_bit() or clear_bit() to change their values.
 109          */
 110         unsigned long           flags;
 111 #define HCD_FLAG_HW_ACCESSIBLE          0       /* at full power */
 112 #define HCD_FLAG_POLL_RH                2       /* poll for rh status? */
 113 #define HCD_FLAG_POLL_PENDING           3       /* status has changed? */
 114 #define HCD_FLAG_WAKEUP_PENDING         4       /* root hub is resuming? */
 115 #define HCD_FLAG_RH_RUNNING             5       /* root hub is running? */
 116 #define HCD_FLAG_DEAD                   6       /* controller has died? */
 117 #define HCD_FLAG_INTF_AUTHORIZED        7       /* authorize interfaces? */
 118 #define HCD_FLAG_DEV_AUTHORIZED         8       /* authorize devices? */
 119
 120         /* The flags can be tested using these macros; they are likely to
 121          * be slightly faster than test_bit().
 122          */
 123 #define HCD_HW_ACCESSIBLE(hcd)  ((hcd)->flags & (1U << HCD_FLAG_HW_ACCESSIBLE))
 124 #define HCD_POLL_RH(hcd)        ((hcd)->flags & (1U << HCD_FLAG_POLL_RH))
 125 #define HCD_POLL_PENDING(hcd)   ((hcd)->flags & (1U << HCD_FLAG_POLL_PENDING))
 126 #define HCD_WAKEUP_PENDING(hcd) ((hcd)->flags & (1U << HCD_FLAG_WAKEUP_PENDING))
 127 #define HCD_RH_RUNNING(hcd)     ((hcd)->flags & (1U << HCD_FLAG_RH_RUNNING))
 128 #define HCD_DEAD(hcd)           ((hcd)->flags & (1U << HCD_FLAG_DEAD))
 129
 130         /*
 131          * Specifies if interfaces are authorized by default
 132          * or they require explicit user space authorization; this bit is
 133          * settable through /sys/class/usb_host/X/interface_authorized_default
 134          */
 135 #define HCD_INTF_AUTHORIZED(hcd) \
 136         ((hcd)->flags & (1U << HCD_FLAG_INTF_AUTHORIZED))
 137
 138         /*
 139          * Specifies if devices are authorized by default
 140          * or they require explicit user space authorization; this bit is
 141          * settable through /sys/class/usb_host/X/authorized_default
 142          */
 143 #define HCD_DEV_AUTHORIZED(hcd) \
 144         ((hcd)->flags & (1U << HCD_FLAG_DEV_AUTHORIZED))
 145
 146         /* Flags that get set only during HCD registration or removal. */
 147         unsigned                rh_registered:1;/* is root hub registered? */
 148         unsigned                rh_pollable:1;  /* may we poll the root hub? */
 149         unsigned                msix_enabled:1; /* driver has MSI-X enabled? */
 150         unsigned                remove_phy:1;   /* auto-remove USB phy */
 151
 152         /* The next flag is a stopgap, to be removed when all the HCDs
 153          * support the new root-hub polling mechanism. */
 154         unsigned                uses_new_polling:1;
 155         unsigned                wireless:1;     /* Wireless USB HCD */
 156         unsigned                has_tt:1;       /* Integrated TT in root hub */
 157         unsigned                amd_resume_bug:1; /* AMD remote wakeup quirk */
 158         unsigned                can_do_streams:1; /* HC supports streams */
 159         unsigned                tpl_support:1; /* OTG & EH TPL support */
 160         unsigned                cant_recv_wakeups:1;
 161                         /* wakeup requests from downstream aren't received */
 162
 163         unsigned int            irq;            /* irq allocated */
 164         void __iomem            *regs;          /* device memory/io */
 165         resource_size_t         rsrc_start;     /* memory/io resource start */
 166         resource_size_t         rsrc_len;       /* memory/io resource length */
 167         unsigned                power_budget;   /* in mA, 0 = no limit */
 168
 169         struct giveback_urb_bh  high_prio_bh;
 170         struct giveback_urb_bh  low_prio_bh;
 171
 172         /* bandwidth_mutex should be taken before adding or removing
 173          * any new bus bandwidth constraints:
 174          *   1. Before adding a configuration for a new device.
 175          *   2. Before removing the configuration to put the device into
 176          *      the addressed state.
 177          *   3. Before selecting a different configuration.
 178          *   4. Before selecting an alternate interface setting.
 179          *
 180          * bandwidth_mutex should be dropped after a successful control message
 181          * to the device, or resetting the bandwidth after a failed attempt.
 182          */
 183         struct mutex            *bandwidth_mutex;
 184         struct usb_hcd          *shared_hcd;
 185         struct usb_hcd          *primary_hcd;
 186
 187
 188 #define HCD_BUFFER_POOLS        4
 189         struct dma_pool         *pool[HCD_BUFFER_POOLS];
 190
 191         int                     state;
 192 #       define  __ACTIVE                0x01
 193 #       define  __SUSPEND               0x04
 194 #       define  __TRANSIENT             0x80
 195
 196 #       define  HC_STATE_HALT           0
 197 #       define  HC_STATE_RUNNING        (__ACTIVE)
 198 #       define  HC_STATE_QUIESCING      (__SUSPEND|__TRANSIENT|__ACTIVE)
 199 #       define  HC_STATE_RESUMING       (__SUSPEND|__TRANSIENT)
 200 #       define  HC_STATE_SUSPENDED      (__SUSPEND)
 201
 202 #define HC_IS_RUNNING(state) ((state) & __ACTIVE)
 203 #define HC_IS_SUSPENDED(state) ((state) & __SUSPEND)
 204
 205         /* more shared queuing code would be good; it should support
 206          * smarter scheduling, handle transaction translators, etc;
 207          * input size of periodic table to an interrupt scheduler.
 208          * (ohci 32, uhci 1024, ehci 256/512/1024).
 209          */
 210
 211         /* The HC driver's private data is stored at the end of
 212          * this structure.
 213          */
 214         unsigned long hcd_priv[0]
 215                         __attribute__ ((aligned(sizeof(s64))));
 216 };
 217
 218 /* 2.4 does this a bit differently ... */
 219 static inline struct usb_bus *hcd_to_bus(struct usb_hcd *hcd)
 220 {
 221         return &hcd->self;
 222 }
 223
 224 static inline struct usb_hcd *bus_to_hcd(struct usb_bus *bus)
 225 {
 226         return container_of(bus, struct usb_hcd, self);
 227 }
 228
 229 struct hcd_timeout {    /* timeouts we allocate */
 230         struct list_head        timeout_list;
 231         struct timer_list       timer;
 232 };
 233
 234 /*-------------------------------------------------------------------------*/
 235
 236
 237 struct hc_driver {
 238         const char      *description;   /* "ehci-hcd" etc */
 239         const char      *product_desc;  /* product/vendor string */
 240         size_t          hcd_priv_size;  /* size of private data */
 241
 242         /* irq handler */
 243         irqreturn_t     (*irq) (struct usb_hcd *hcd);
 244
 245         int     flags;
 246 #define HCD_MEMORY      0x0001          /* HC regs use memory (else I/O) */
 247 #define HCD_LOCAL_MEM   0x0002          /* HC needs local memory */
 248 #define HCD_SHARED      0x0004          /* Two (or more) usb_hcds share HW */
 249 #define HCD_USB11       0x0010          /* USB 1.1 */
 250 #define HCD_USB2        0x0020          /* USB 2.0 */
 251 #define HCD_USB25       0x0030          /* Wireless USB 1.0 (USB 2.5)*/
 252 #define HCD_USB3        0x0040          /* USB 3.0 */
 253 #define HCD_USB31       0x0050          /* USB 3.1 */
 254 #define HCD_MASK        0x0070
 255 #define HCD_BH          0x0100          /* URB complete in BH context */
 256
 257         /* called to init HCD and root hub */
 258         int     (*reset) (struct usb_hcd *hcd);
 259         int     (*start) (struct usb_hcd *hcd);
 260
 261         /* NOTE:  these suspend/resume calls relate to the HC as
 262          * a whole, not just the root hub; they're for PCI bus glue.
 263          */
 264         /* called after suspending the hub, before entering D3 etc */
 265         int     (*pci_suspend)(struct usb_hcd *hcd, bool do_wakeup);
 266
 267         /* called after entering D0 (etc), before resuming the hub */
 268         int     (*pci_resume)(struct usb_hcd *hcd, bool hibernated);
 269
 270         /* cleanly make HCD stop writing memory and doing I/O */
 271         void    (*stop) (struct usb_hcd *hcd);
 272
 273         /* shutdown HCD */
 274         void    (*shutdown) (struct usb_hcd *hcd);
 275
 276         /* return current frame number */
 277         int     (*get_frame_number) (struct usb_hcd *hcd);
 278
 279         /* manage i/o requests, device state */
 280         int     (*urb_enqueue)(struct usb_hcd *hcd,
 281                                 struct urb *urb, gfp_t mem_flags);
 282         int     (*urb_dequeue)(struct usb_hcd *hcd,
 283                                 struct urb *urb, int status);
 284
 285         /*
 286          * (optional) these hooks allow an HCD to override the default DMA
 287          * mapping and unmapping routines.  In general, they shouldn't be
 288          * necessary unless the host controller has special DMA requirements,
 289          * such as alignment contraints.  If these are not specified, the
 290          * general usb_hcd_(un)?map_urb_for_dma functions will be used instead
 291          * (and it may be a good idea to call these functions in your HCD
 292          * implementation)
 293          */
 294         int     (*map_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb,
 295                                    gfp_t mem_flags);
 296         void    (*unmap_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb);
 297
 298         /* hw synch, freeing endpoint resources that urb_dequeue can't */
 299         void    (*endpoint_disable)(struct usb_hcd *hcd,
 300                         struct usb_host_endpoint *ep);
 301
 302         /* (optional) reset any endpoint state such as sequence number
 303            and current window */
 304         void    (*endpoint_reset)(struct usb_hcd *hcd,
 305                         struct usb_host_endpoint *ep);
 306
 307         /* root hub support */
 308         int     (*hub_status_data) (struct usb_hcd *hcd, char *buf);
 309         int     (*hub_control) (struct usb_hcd *hcd,
 310                                 u16 typeReq, u16 wValue, u16 wIndex,
 311                                 char *buf, u16 wLength);
 312         int     (*bus_suspend)(struct usb_hcd *);
 313         int     (*bus_resume)(struct usb_hcd *);
 314         int     (*start_port_reset)(struct usb_hcd *, unsigned port_num);
 315
 316                 /* force handover of high-speed port to full-speed companion */
 317         void    (*relinquish_port)(struct usb_hcd *, int);
 318                 /* has a port been handed over to a companion? */
 319         int     (*port_handed_over)(struct usb_hcd *, int);
 320
 321                 /* CLEAR_TT_BUFFER completion callback */
 322         void    (*clear_tt_buffer_complete)(struct usb_hcd *,
 323                                 struct usb_host_endpoint *);
 324
 325         /* xHCI specific functions */
 326                 /* Called by usb_alloc_dev to alloc HC device structures */
 327         int     (*alloc_dev)(struct usb_hcd *, struct usb_device *);
 328                 /* Called by usb_disconnect to free HC device structures */
 329         void    (*free_dev)(struct usb_hcd *, struct usb_device *);
 330         /* Change a group of bulk endpoints to support multiple stream IDs */
 331         int     (*alloc_streams)(struct usb_hcd *hcd, struct usb_device *udev,
 332                 struct usb_host_endpoint **eps, unsigned int num_eps,
 333                 unsigned int num_streams, gfp_t mem_flags);
 334         /* Reverts a group of bulk endpoints back to not using stream IDs.
 335          * Can fail if we run out of memory.
 336          */
 337         int     (*free_streams)(struct usb_hcd *hcd, struct usb_device *udev,
 338                 struct usb_host_endpoint **eps, unsigned int num_eps,
 339                 gfp_t mem_flags);
 340
 341         /* Bandwidth computation functions */
 342         /* Note that add_endpoint() can only be called once per endpoint before
 343          * check_bandwidth() or reset_bandwidth() must be called.
 344          * drop_endpoint() can only be called once per endpoint also.
 345          * A call to xhci_drop_endpoint() followed by a call to
 346          * xhci_add_endpoint() will add the endpoint to the schedule with
 347          * possibly new parameters denoted by a different endpoint descriptor
 348          * in usb_host_endpoint.  A call to xhci_add_endpoint() followed by a
 349          * call to xhci_drop_endpoint() is not allowed.
 350          */
 351                 /* Allocate endpoint resources and add them to a new schedule */
 352         int     (*add_endpoint)(struct usb_hcd *, struct usb_device *,
 353                                 struct usb_host_endpoint *);
 354                 /* Drop an endpoint from a new schedule */
 355         int     (*drop_endpoint)(struct usb_hcd *, struct usb_device *,
 356                                  struct usb_host_endpoint *);
 357                 /* Check that a new hardware configuration, set using
 358                  * endpoint_enable and endpoint_disable, does not exceed bus
 359                  * bandwidth.  This must be called before any set configuration
 360                  * or set interface requests are sent to the device.
 361                  */
 362         int     (*check_bandwidth)(struct usb_hcd *, struct usb_device *);
 363                 /* Reset the device schedule to the last known good schedule,
 364                  * which was set from a previous successful call to
 365                  * check_bandwidth().  This reverts any add_endpoint() and
 366                  * drop_endpoint() calls since that last successful call.
 367                  * Used for when a check_bandwidth() call fails due to resource
 368                  * or bandwidth constraints.
 369                  */
 370         void    (*reset_bandwidth)(struct usb_hcd *, struct usb_device *);
 371                 /* Returns the hardware-chosen device address */
 372         int     (*address_device)(struct usb_hcd *, struct usb_device *udev);
 373                 /* prepares the hardware to send commands to the device */
 374         int     (*enable_device)(struct usb_hcd *, struct usb_device *udev);
 375                 /* Notifies the HCD after a hub descriptor is fetched.
 376                  * Will block.
 377                  */
 378         int     (*update_hub_device)(struct usb_hcd *, struct usb_device *hdev,
 379                         struct usb_tt *tt, gfp_t mem_flags);
 380         int     (*reset_device)(struct usb_hcd *, struct usb_device *);
 381                 /* Notifies the HCD after a device is connected and its
 382                  * address is set
 383                  */
 384         int     (*update_device)(struct usb_hcd *, struct usb_device *);
 385         int     (*set_usb2_hw_lpm)(struct usb_hcd *, struct usb_device *, int);
 386         /* USB 3.0 Link Power Management */
 387                 /* Returns the USB3 hub-encoded value for the U1/U2 timeout. */
 388         int     (*enable_usb3_lpm_timeout)(struct usb_hcd *,
 389                         struct usb_device *, enum usb3_link_state state);
 390                 /* The xHCI host controller can still fail the command to
 391                  * disable the LPM timeouts, so this can return an error code.
 392                  */
 393         int     (*disable_usb3_lpm_timeout)(struct usb_hcd *,
 394                         struct usb_device *, enum usb3_link_state state);
 395         int     (*find_raw_port_number)(struct usb_hcd *, int);
 396         /* Call for power on/off the port if necessary */
 397         int     (*port_power)(struct usb_hcd *hcd, int portnum, bool enable);
 398
 399 };
 400
 401 static inline int hcd_giveback_urb_in_bh(struct usb_hcd *hcd)
 402 {
 403         return hcd->driver->flags & HCD_BH;
 404 }
 405
 406 static inline bool hcd_periodic_completion_in_progress(struct usb_hcd *hcd,
 407                 struct usb_host_endpoint *ep)
 408 {
 409         return hcd->high_prio_bh.completing_ep == ep;
 410 }
 411
 412 extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
 413 extern int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
 414                 int status);
 415 extern void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb);
 416
 417 extern int usb_hcd_submit_urb(struct urb *urb, gfp_t mem_flags);
 418 extern int usb_hcd_unlink_urb(struct urb *urb, int status);
 419 extern void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb,
 420                 int status);
 421 extern int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
 422                 gfp_t mem_flags);
 423 extern void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *, struct urb *);
 424 extern void usb_hcd_unmap_urb_for_dma(struct usb_hcd *, struct urb *);
 425 extern void usb_hcd_flush_endpoint(struct usb_device *udev,
 426                 struct usb_host_endpoint *ep);
 427 extern void usb_hcd_disable_endpoint(struct usb_device *udev,
 428                 struct usb_host_endpoint *ep);
 429 extern void usb_hcd_reset_endpoint(struct usb_device *udev,
 430                 struct usb_host_endpoint *ep);
 431 extern void usb_hcd_synchronize_unlinks(struct usb_device *udev);
 432 extern int usb_hcd_alloc_bandwidth(struct usb_device *udev,
 433                 struct usb_host_config *new_config,
 434                 struct usb_host_interface *old_alt,
 435                 struct usb_host_interface *new_alt);
 436 extern int usb_hcd_get_frame_number(struct usb_device *udev);
 437
 438 extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
 439                 struct device *dev, const char *bus_name);
 440 extern struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
 441                 struct device *dev, const char *bus_name,
 442                 struct usb_hcd *shared_hcd);
 443 extern struct usb_hcd *usb_get_hcd(struct usb_hcd *hcd);
 444 extern void usb_put_hcd(struct usb_hcd *hcd);
 445 extern int usb_hcd_is_primary_hcd(struct usb_hcd *hcd);
 446 extern int usb_add_hcd(struct usb_hcd *hcd,
 447                 unsigned int irqnum, unsigned long irqflags);
 448 extern void usb_remove_hcd(struct usb_hcd *hcd);
 449 extern int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1);
 450
 451 struct platform_device;
 452 extern void usb_hcd_platform_shutdown(struct platform_device *dev);
 453
 454 #ifdef CONFIG_PCI
 455 struct pci_dev;
 456 struct pci_device_id;
 457 extern int usb_hcd_pci_probe(struct pci_dev *dev,
 458                                 const struct pci_device_id *id);
 459 extern void usb_hcd_pci_remove(struct pci_dev *dev);
 460 extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
 461
 462 extern int usb_hcd_amd_remote_wakeup_quirk(struct pci_dev *dev);
 463
 464 #ifdef CONFIG_PM
 465 extern const struct dev_pm_ops usb_hcd_pci_pm_ops;
 466 #endif
 467 #endif /* CONFIG_PCI */
 468
 469 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
 470 void usb_init_pool_max(void);
 471 int hcd_buffer_create(struct usb_hcd *hcd);
 472 void hcd_buffer_destroy(struct usb_hcd *hcd);
 473
 474 void *hcd_buffer_alloc(struct usb_bus *bus, size_t size,
 475         gfp_t mem_flags, dma_addr_t *dma);
 476 void hcd_buffer_free(struct usb_bus *bus, size_t size,
 477         void *addr, dma_addr_t dma);
 478
 479 /* generic bus glue, needed for host controllers that don't use PCI */
 480 extern irqreturn_t usb_hcd_irq(int irq, void *__hcd);
 481
 482 extern void usb_hc_died(struct usb_hcd *hcd);
 483 extern void usb_hcd_poll_rh_status(struct usb_hcd *hcd);
 484 extern void usb_wakeup_notification(struct usb_device *hdev,
 485                 unsigned int portnum);
 486
 487 extern void usb_hcd_start_port_resume(struct usb_bus *bus, int portnum);
 488 extern void usb_hcd_end_port_resume(struct usb_bus *bus, int portnum);
 489
 490 /* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
 491 #define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
 492 #define usb_dotoggle(dev, ep, out)  ((dev)->toggle[out] ^= (1 << (ep)))
 493 #define usb_settoggle(dev, ep, out, bit) \
 494                 ((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | \
 495                  ((bit) << (ep)))
 496
 497 /* -------------------------------------------------------------------------- */
 498
 499 /* Enumeration is only for the hub driver, or HCD virtual root hubs */
 500 extern struct usb_device *usb_alloc_dev(struct usb_device *parent,
 501                                         struct usb_bus *, unsigned port);
 502 extern int usb_new_device(struct usb_device *dev);
 503 extern void usb_disconnect(struct usb_device **);
 504
 505 extern int usb_get_configuration(struct usb_device *dev);
 506 extern void usb_destroy_configuration(struct usb_device *dev);
 507
 508 /*-------------------------------------------------------------------------*/
 509
 510 /*
 511  * HCD Root Hub support
 512  */
 513
 514 #include <linux/usb/ch11.h>
 515
 516 /*
 517  * As of USB 2.0, full/low speed devices are segregated into trees.
 518  * One type grows from USB 1.1 host controllers (OHCI, UHCI etc).
 519  * The other type grows from high speed hubs when they connect to
 520  * full/low speed devices using "Transaction Translators" (TTs).
 521  *
 522  * TTs should only be known to the hub driver, and high speed bus
 523  * drivers (only EHCI for now).  They affect periodic scheduling and
 524  * sometimes control/bulk error recovery.
 525  */
 526
 527 struct usb_device;
 528
 529 struct usb_tt {
 530         struct usb_device       *hub;   /* upstream highspeed hub */
 531         int                     multi;  /* true means one TT per port */
 532         unsigned                think_time;     /* think time in ns */
 533         void                    *hcpriv;        /* HCD private data */
 534
 535         /* for control/bulk error recovery (CLEAR_TT_BUFFER) */
 536         spinlock_t              lock;
 537         struct list_head        clear_list;     /* of usb_tt_clear */
 538         struct work_struct      clear_work;
 539 };
 540
 541 struct usb_tt_clear {
 542         struct list_head        clear_list;
 543         unsigned                tt;
 544         u16                     devinfo;
 545         struct usb_hcd          *hcd;
 546         struct usb_host_endpoint        *ep;
 547 };
 548
 549 extern int usb_hub_clear_tt_buffer(struct urb *urb);
 550 extern void usb_ep0_reinit(struct usb_device *);
 551
 552 /* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
 553 #define DeviceRequest \
 554         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
 555 #define DeviceOutRequest \
 556         ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
 557
 558 #define InterfaceRequest \
 559         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 560
 561 #define EndpointRequest \
 562         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 563 #define EndpointOutRequest \
 564         ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 565
 566 /* class requests from the USB 2.0 hub spec, table 11-15 */
 567 /* GetBusState and SetHubDescriptor are optional, omitted */
 568 #define ClearHubFeature         (0x2000 | USB_REQ_CLEAR_FEATURE)
 569 #define ClearPortFeature        (0x2300 | USB_REQ_CLEAR_FEATURE)
 570 #define GetHubDescriptor        (0xa000 | USB_REQ_GET_DESCRIPTOR)
 571 #define GetHubStatus            (0xa000 | USB_REQ_GET_STATUS)
 572 #define GetPortStatus           (0xa300 | USB_REQ_GET_STATUS)
 573 #define SetHubFeature           (0x2000 | USB_REQ_SET_FEATURE)
 574 #define SetPortFeature          (0x2300 | USB_REQ_SET_FEATURE)
 575
 576
 577 /*-------------------------------------------------------------------------*/
 578
 579 /* class requests from USB 3.1 hub spec, table 10-7 */
 580 #define SetHubDepth             (0x2000 | HUB_SET_DEPTH)
 581 #define GetPortErrorCount       (0xa300 | HUB_GET_PORT_ERR_COUNT)
 582
 583 /*
 584  * Generic bandwidth allocation constants/support
 585  */
 586 #define FRAME_TIME_USECS        1000L
 587 #define BitTime(bytecount) (7 * 8 * bytecount / 6) /* with integer truncation */
 588                 /* Trying not to use worst-case bit-stuffing
 589                  * of (7/6 * 8 * bytecount) = 9.33 * bytecount */
 590                 /* bytecount = data payload byte count */
 591
 592 #define NS_TO_US(ns)    DIV_ROUND_UP(ns, 1000L)
 593                         /* convert nanoseconds to microseconds, rounding up */
 594
 595 /*
 596  * Full/low speed bandwidth allocation constants/support.
 597  */
 598 #define BW_HOST_DELAY   1000L           /* nanoseconds */
 599 #define BW_HUB_LS_SETUP 333L            /* nanoseconds */
 600                         /* 4 full-speed bit times (est.) */
 601
 602 #define FRAME_TIME_BITS                 12000L  /* frame = 1 millisecond */
 603 #define FRAME_TIME_MAX_BITS_ALLOC       (90L * FRAME_TIME_BITS / 100L)
 604 #define FRAME_TIME_MAX_USECS_ALLOC      (90L * FRAME_TIME_USECS / 100L)
 605
 606 /*
 607  * Ceiling [nano/micro]seconds (typical) for that many bytes at high speed
 608  * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
 609  * to preallocate bandwidth)
 610  */
 611 #define USB2_HOST_DELAY 5       /* nsec, guess */
 612 #define HS_NSECS(bytes) (((55 * 8 * 2083) \
 613         + (2083UL * (3 + BitTime(bytes))))/1000 \
 614         + USB2_HOST_DELAY)
 615 #define HS_NSECS_ISO(bytes) (((38 * 8 * 2083) \
 616         + (2083UL * (3 + BitTime(bytes))))/1000 \
 617         + USB2_HOST_DELAY)
 618 #define HS_USECS(bytes)         NS_TO_US(HS_NSECS(bytes))
 619 #define HS_USECS_ISO(bytes)     NS_TO_US(HS_NSECS_ISO(bytes))
 620
 621 extern long usb_calc_bus_time(int speed, int is_input,
 622                         int isoc, int bytecount);
 623
 624 /*-------------------------------------------------------------------------*/
 625
 626 extern void usb_set_device_state(struct usb_device *udev,
 627                 enum usb_device_state new_state);
 628
 629 /*-------------------------------------------------------------------------*/
 630
 631 /* exported only within usbcore */
 632
 633 extern struct list_head usb_bus_list;
 634 extern struct mutex usb_bus_list_lock;
 635 extern wait_queue_head_t usb_kill_urb_queue;
 636
 637
 638 #define usb_endpoint_out(ep_dir)        (!((ep_dir) & USB_DIR_IN))
 639
 640 #ifdef CONFIG_PM
 641 extern void usb_root_hub_lost_power(struct usb_device *rhdev);
 642 extern int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg);
 643 extern int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg);
 644 extern void usb_hcd_resume_root_hub(struct usb_hcd *hcd);
 645 #else
 646 static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
 647 {
 648         return;
 649 }
 650 #endif /* CONFIG_PM */
 651
 652 /*-------------------------------------------------------------------------*/
 653
 654 #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
 655
 656 struct usb_mon_operations {
 657         void (*urb_submit)(struct usb_bus *bus, struct urb *urb);
 658         void (*urb_submit_error)(struct usb_bus *bus, struct urb *urb, int err);
 659         void (*urb_complete)(struct usb_bus *bus, struct urb *urb, int status);
 660         /* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
 661 };
 662
 663 extern struct usb_mon_operations *mon_ops;
 664
 665 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb)
 666 {
 667         if (bus->monitored)
 668                 (*mon_ops->urb_submit)(bus, urb);
 669 }
 670
 671 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
 672     int error)
 673 {
 674         if (bus->monitored)
 675                 (*mon_ops->urb_submit_error)(bus, urb, error);
 676 }
 677
 678 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
 679                 int status)
 680 {
 681         if (bus->monitored)
 682                 (*mon_ops->urb_complete)(bus, urb, status);
 683 }
 684
 685 int usb_mon_register(struct usb_mon_operations *ops);
 686 void usb_mon_deregister(void);
 687
 688 #else
 689
 690 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb) {}
 691 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
 692     int error) {}
 693 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
 694                 int status) {}
 695
 696 #endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
 697
 698 /*-------------------------------------------------------------------------*/
 699
 700 /* random stuff */
 701
 702 #define RUN_CONTEXT (in_irq() ? "in_irq" \
 703                 : (in_interrupt() ? "in_interrupt" : "can sleep"))
 704
 705
 706 /* This rwsem is for use only by the hub driver and ehci-hcd.
 707  * Nobody else should touch it.
 708  */
 709 extern struct rw_semaphore ehci_cf_port_reset_rwsem;
 710
 711 /* Keep track of which host controller drivers are loaded */
 712 #define USB_UHCI_LOADED         0
 713 #define USB_OHCI_LOADED         1
 714 #define USB_EHCI_LOADED         2
 715 extern unsigned long usb_hcds_loaded;
 716
 717 #endif /* __KERNEL__ */
 718
 719 #endif /* __USB_CORE_HCD_H */