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 #include <linux/idr.h>
  27
  28 #define MAX_TOPO_LEVEL          6
  29
  30 /* This file contains declarations of usbcore internals that are mostly
  31  * used or exposed by Host Controller Drivers.
  32  */
  33
  34 /*
  35  * USB Packet IDs (PIDs)
  36  */
  37 #define USB_PID_EXT                     0xf0    /* USB 2.0 LPM ECN */
  38 #define USB_PID_OUT                     0xe1
  39 #define USB_PID_ACK                     0xd2
  40 #define USB_PID_DATA0                   0xc3
  41 #define USB_PID_PING                    0xb4    /* USB 2.0 */
  42 #define USB_PID_SOF                     0xa5
  43 #define USB_PID_NYET                    0x96    /* USB 2.0 */
  44 #define USB_PID_DATA2                   0x87    /* USB 2.0 */
  45 #define USB_PID_SPLIT                   0x78    /* USB 2.0 */
  46 #define USB_PID_IN                      0x69
  47 #define USB_PID_NAK                     0x5a
  48 #define USB_PID_DATA1                   0x4b
  49 #define USB_PID_PREAMBLE                0x3c    /* Token mode */
  50 #define USB_PID_ERR                     0x3c    /* USB 2.0: handshake mode */
  51 #define USB_PID_SETUP                   0x2d
  52 #define USB_PID_STALL                   0x1e
  53 #define USB_PID_MDATA                   0x0f    /* USB 2.0 */
  54
  55 /*-------------------------------------------------------------------------*/
  56
  57 /*
  58  * USB Host Controller Driver (usb_hcd) framework
  59  *
  60  * Since "struct usb_bus" is so thin, you can't share much code in it.
  61  * This framework is a layer over that, and should be more sharable.
  62  */
  63
  64 /*-------------------------------------------------------------------------*/
  65
  66 struct giveback_urb_bh {
  67         bool running;
  68         spinlock_t lock;
  69         struct list_head  head;
  70         struct tasklet_struct bh;
  71         struct usb_host_endpoint *completing_ep;
  72 };
  73
  74 struct usb_hcd {
  75
  76         /*
  77          * housekeeping
  78          */
  79         struct usb_bus          self;           /* hcd is-a bus */
  80         struct kref             kref;           /* reference counter */
  81
  82         const char              *product_desc;  /* product/vendor string */
  83         int                     speed;          /* Speed for this roothub.
  84                                                  * May be different from
  85                                                  * hcd->driver->flags & HCD_MASK
  86                                                  */
  87         char                    irq_descr[24];  /* driver + bus # */
  88
  89         struct timer_list       rh_timer;       /* drives root-hub polling */
  90         struct urb              *status_urb;    /* the current status urb */
  91 #ifdef CONFIG_PM
  92         struct work_struct      wakeup_work;    /* for remote wakeup */
  93 #endif
  94
  95         /*
  96          * hardware info/state
  97          */
  98         const struct hc_driver  *driver;        /* hw-specific hooks */
  99
 100         /*
 101          * OTG and some Host controllers need software interaction with phys;
 102          * other external phys should be software-transparent
 103          */
 104         struct usb_phy          *usb_phy;
 105         struct phy              *phy;
 106
 107         /* Flags that need to be manipulated atomically because they can
 108          * change while the host controller is running.  Always use
 109          * set_bit() or clear_bit() to change their values.
 110          */
 111         unsigned long           flags;
 112 #define HCD_FLAG_HW_ACCESSIBLE          0       /* at full power */
 113 #define HCD_FLAG_POLL_RH                2       /* poll for rh status? */
 114 #define HCD_FLAG_POLL_PENDING           3       /* status has changed? */
 115 #define HCD_FLAG_WAKEUP_PENDING         4       /* root hub is resuming? */
 116 #define HCD_FLAG_RH_RUNNING             5       /* root hub is running? */
 117 #define HCD_FLAG_DEAD                   6       /* controller has died? */
 118 #define HCD_FLAG_INTF_AUTHORIZED        7       /* authorize interfaces? */
 119 #define HCD_FLAG_DEV_AUTHORIZED         8       /* authorize devices? */
 120
 121         /* The flags can be tested using these macros; they are likely to
 122          * be slightly faster than test_bit().
 123          */
 124 #define HCD_HW_ACCESSIBLE(hcd)  ((hcd)->flags & (1U << HCD_FLAG_HW_ACCESSIBLE))
 125 #define HCD_POLL_RH(hcd)        ((hcd)->flags & (1U << HCD_FLAG_POLL_RH))
 126 #define HCD_POLL_PENDING(hcd)   ((hcd)->flags & (1U << HCD_FLAG_POLL_PENDING))
 127 #define HCD_WAKEUP_PENDING(hcd) ((hcd)->flags & (1U << HCD_FLAG_WAKEUP_PENDING))
 128 #define HCD_RH_RUNNING(hcd)     ((hcd)->flags & (1U << HCD_FLAG_RH_RUNNING))
 129 #define HCD_DEAD(hcd)           ((hcd)->flags & (1U << HCD_FLAG_DEAD))
 130
 131         /*
 132          * Specifies if interfaces are authorized by default
 133          * or they require explicit user space authorization; this bit is
 134          * settable through /sys/class/usb_host/X/interface_authorized_default
 135          */
 136 #define HCD_INTF_AUTHORIZED(hcd) \
 137         ((hcd)->flags & (1U << HCD_FLAG_INTF_AUTHORIZED))
 138
 139         /*
 140          * Specifies if devices are authorized by default
 141          * or they require explicit user space authorization; this bit is
 142          * settable through /sys/class/usb_host/X/authorized_default
 143          */
 144 #define HCD_DEV_AUTHORIZED(hcd) \
 145         ((hcd)->flags & (1U << HCD_FLAG_DEV_AUTHORIZED))
 146
 147         /* Flags that get set only during HCD registration or removal. */
 148         unsigned                rh_registered:1;/* is root hub registered? */
 149         unsigned                rh_pollable:1;  /* may we poll the root hub? */
 150         unsigned                msix_enabled:1; /* driver has MSI-X enabled? */
 151         unsigned                remove_phy:1;   /* auto-remove USB phy */
 152
 153         /* The next flag is a stopgap, to be removed when all the HCDs
 154          * support the new root-hub polling mechanism. */
 155         unsigned                uses_new_polling:1;
 156         unsigned                wireless:1;     /* Wireless USB HCD */
 157         unsigned                has_tt:1;       /* Integrated TT in root hub */
 158         unsigned                amd_resume_bug:1; /* AMD remote wakeup quirk */
 159         unsigned                can_do_streams:1; /* HC supports streams */
 160         unsigned                tpl_support:1; /* OTG & EH TPL support */
 161         unsigned                cant_recv_wakeups:1;
 162                         /* wakeup requests from downstream aren't received */
 163
 164         unsigned int            irq;            /* irq allocated */
 165         void __iomem            *regs;          /* device memory/io */
 166         resource_size_t         rsrc_start;     /* memory/io resource start */
 167         resource_size_t         rsrc_len;       /* memory/io resource length */
 168         unsigned                power_budget;   /* in mA, 0 = no limit */
 169
 170         struct giveback_urb_bh  high_prio_bh;
 171         struct giveback_urb_bh  low_prio_bh;
 172
 173         /* bandwidth_mutex should be taken before adding or removing
 174          * any new bus bandwidth constraints:
 175          *   1. Before adding a configuration for a new device.
 176          *   2. Before removing the configuration to put the device into
 177          *      the addressed state.
 178          *   3. Before selecting a different configuration.
 179          *   4. Before selecting an alternate interface setting.
 180          *
 181          * bandwidth_mutex should be dropped after a successful control message
 182          * to the device, or resetting the bandwidth after a failed attempt.
 183          */
 184         struct mutex            *address0_mutex;
 185         struct mutex            *bandwidth_mutex;
 186         struct usb_hcd          *shared_hcd;
 187         struct usb_hcd          *primary_hcd;
 188
 189
 190 #define HCD_BUFFER_POOLS        4
 191         struct dma_pool         *pool[HCD_BUFFER_POOLS];
 192
 193         int                     state;
 194 #       define  __ACTIVE                0x01
 195 #       define  __SUSPEND               0x04
 196 #       define  __TRANSIENT             0x80
 197
 198 #       define  HC_STATE_HALT           0
 199 #       define  HC_STATE_RUNNING        (__ACTIVE)
 200 #       define  HC_STATE_QUIESCING      (__SUSPEND|__TRANSIENT|__ACTIVE)
 201 #       define  HC_STATE_RESUMING       (__SUSPEND|__TRANSIENT)
 202 #       define  HC_STATE_SUSPENDED      (__SUSPEND)
 203
 204 #define HC_IS_RUNNING(state) ((state) & __ACTIVE)
 205 #define HC_IS_SUSPENDED(state) ((state) & __SUSPEND)
 206
 207         /* more shared queuing code would be good; it should support
 208          * smarter scheduling, handle transaction translators, etc;
 209          * input size of periodic table to an interrupt scheduler.
 210          * (ohci 32, uhci 1024, ehci 256/512/1024).
 211          */
 212
 213         /* The HC driver's private data is stored at the end of
 214          * this structure.
 215          */
 216         unsigned long hcd_priv[0]
 217                         __attribute__ ((aligned(sizeof(s64))));
 218 };
 219
 220 /* 2.4 does this a bit differently ... */
 221 static inline struct usb_bus *hcd_to_bus(struct usb_hcd *hcd)
 222 {
 223         return &hcd->self;
 224 }
 225
 226 static inline struct usb_hcd *bus_to_hcd(struct usb_bus *bus)
 227 {
 228         return container_of(bus, struct usb_hcd, self);
 229 }
 230
 231 struct hcd_timeout {    /* timeouts we allocate */
 232         struct list_head        timeout_list;
 233         struct timer_list       timer;
 234 };
 235
 236 /*-------------------------------------------------------------------------*/
 237
 238
 239 struct hc_driver {
 240         const char      *description;   /* "ehci-hcd" etc */
 241         const char      *product_desc;  /* product/vendor string */
 242         size_t          hcd_priv_size;  /* size of private data */
 243
 244         /* irq handler */
 245         irqreturn_t     (*irq) (struct usb_hcd *hcd);
 246
 247         int     flags;
 248 #define HCD_MEMORY      0x0001          /* HC regs use memory (else I/O) */
 249 #define HCD_LOCAL_MEM   0x0002          /* HC needs local memory */
 250 #define HCD_SHARED      0x0004          /* Two (or more) usb_hcds share HW */
 251 #define HCD_USB11       0x0010          /* USB 1.1 */
 252 #define HCD_USB2        0x0020          /* USB 2.0 */
 253 #define HCD_USB25       0x0030          /* Wireless USB 1.0 (USB 2.5)*/
 254 #define HCD_USB3        0x0040          /* USB 3.0 */
 255 #define HCD_USB31       0x0050          /* USB 3.1 */
 256 #define HCD_MASK        0x0070
 257 #define HCD_BH          0x0100          /* URB complete in BH context */
 258
 259         /* called to init HCD and root hub */
 260         int     (*reset) (struct usb_hcd *hcd);
 261         int     (*start) (struct usb_hcd *hcd);
 262
 263         /* NOTE:  these suspend/resume calls relate to the HC as
 264          * a whole, not just the root hub; they're for PCI bus glue.
 265          */
 266         /* called after suspending the hub, before entering D3 etc */
 267         int     (*pci_suspend)(struct usb_hcd *hcd, bool do_wakeup);
 268
 269         /* called after entering D0 (etc), before resuming the hub */
 270         int     (*pci_resume)(struct usb_hcd *hcd, bool hibernated);
 271
 272         /* cleanly make HCD stop writing memory and doing I/O */
 273         void    (*stop) (struct usb_hcd *hcd);
 274
 275         /* shutdown HCD */
 276         void    (*shutdown) (struct usb_hcd *hcd);
 277
 278         /* return current frame number */
 279         int     (*get_frame_number) (struct usb_hcd *hcd);
 280
 281         /* manage i/o requests, device state */
 282         int     (*urb_enqueue)(struct usb_hcd *hcd,
 283                                 struct urb *urb, gfp_t mem_flags);
 284         int     (*urb_dequeue)(struct usb_hcd *hcd,
 285                                 struct urb *urb, int status);
 286
 287         /*
 288          * (optional) these hooks allow an HCD to override the default DMA
 289          * mapping and unmapping routines.  In general, they shouldn't be
 290          * necessary unless the host controller has special DMA requirements,
 291          * such as alignment contraints.  If these are not specified, the
 292          * general usb_hcd_(un)?map_urb_for_dma functions will be used instead
 293          * (and it may be a good idea to call these functions in your HCD
 294          * implementation)
 295          */
 296         int     (*map_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb,
 297                                    gfp_t mem_flags);
 298         void    (*unmap_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb);
 299
 300         /* hw synch, freeing endpoint resources that urb_dequeue can't */
 301         void    (*endpoint_disable)(struct usb_hcd *hcd,
 302                         struct usb_host_endpoint *ep);
 303
 304         /* (optional) reset any endpoint state such as sequence number
 305            and current window */
 306         void    (*endpoint_reset)(struct usb_hcd *hcd,
 307                         struct usb_host_endpoint *ep);
 308
 309         /* root hub support */
 310         int     (*hub_status_data) (struct usb_hcd *hcd, char *buf);
 311         int     (*hub_control) (struct usb_hcd *hcd,
 312                                 u16 typeReq, u16 wValue, u16 wIndex,
 313                                 char *buf, u16 wLength);
 314         int     (*bus_suspend)(struct usb_hcd *);
 315         int     (*bus_resume)(struct usb_hcd *);
 316         int     (*start_port_reset)(struct usb_hcd *, unsigned port_num);
 317
 318                 /* force handover of high-speed port to full-speed companion */
 319         void    (*relinquish_port)(struct usb_hcd *, int);
 320                 /* has a port been handed over to a companion? */
 321         int     (*port_handed_over)(struct usb_hcd *, int);
 322
 323                 /* CLEAR_TT_BUFFER completion callback */
 324         void    (*clear_tt_buffer_complete)(struct usb_hcd *,
 325                                 struct usb_host_endpoint *);
 326
 327         /* xHCI specific functions */
 328                 /* Called by usb_alloc_dev to alloc HC device structures */
 329         int     (*alloc_dev)(struct usb_hcd *, struct usb_device *);
 330                 /* Called by usb_disconnect to free HC device structures */
 331         void    (*free_dev)(struct usb_hcd *, struct usb_device *);
 332         /* Change a group of bulk endpoints to support multiple stream IDs */
 333         int     (*alloc_streams)(struct usb_hcd *hcd, struct usb_device *udev,
 334                 struct usb_host_endpoint **eps, unsigned int num_eps,
 335                 unsigned int num_streams, gfp_t mem_flags);
 336         /* Reverts a group of bulk endpoints back to not using stream IDs.
 337          * Can fail if we run out of memory.
 338          */
 339         int     (*free_streams)(struct usb_hcd *hcd, struct usb_device *udev,
 340                 struct usb_host_endpoint **eps, unsigned int num_eps,
 341                 gfp_t mem_flags);
 342
 343         /* Bandwidth computation functions */
 344         /* Note that add_endpoint() can only be called once per endpoint before
 345          * check_bandwidth() or reset_bandwidth() must be called.
 346          * drop_endpoint() can only be called once per endpoint also.
 347          * A call to xhci_drop_endpoint() followed by a call to
 348          * xhci_add_endpoint() will add the endpoint to the schedule with
 349          * possibly new parameters denoted by a different endpoint descriptor
 350          * in usb_host_endpoint.  A call to xhci_add_endpoint() followed by a
 351          * call to xhci_drop_endpoint() is not allowed.
 352          */
 353                 /* Allocate endpoint resources and add them to a new schedule */
 354         int     (*add_endpoint)(struct usb_hcd *, struct usb_device *,
 355                                 struct usb_host_endpoint *);
 356                 /* Drop an endpoint from a new schedule */
 357         int     (*drop_endpoint)(struct usb_hcd *, struct usb_device *,
 358                                  struct usb_host_endpoint *);
 359                 /* Check that a new hardware configuration, set using
 360                  * endpoint_enable and endpoint_disable, does not exceed bus
 361                  * bandwidth.  This must be called before any set configuration
 362                  * or set interface requests are sent to the device.
 363                  */
 364         int     (*check_bandwidth)(struct usb_hcd *, struct usb_device *);
 365                 /* Reset the device schedule to the last known good schedule,
 366                  * which was set from a previous successful call to
 367                  * check_bandwidth().  This reverts any add_endpoint() and
 368                  * drop_endpoint() calls since that last successful call.
 369                  * Used for when a check_bandwidth() call fails due to resource
 370                  * or bandwidth constraints.
 371                  */
 372         void    (*reset_bandwidth)(struct usb_hcd *, struct usb_device *);
 373                 /* Returns the hardware-chosen device address */
 374         int     (*address_device)(struct usb_hcd *, struct usb_device *udev);
 375                 /* prepares the hardware to send commands to the device */
 376         int     (*enable_device)(struct usb_hcd *, struct usb_device *udev);
 377                 /* Notifies the HCD after a hub descriptor is fetched.
 378                  * Will block.
 379                  */
 380         int     (*update_hub_device)(struct usb_hcd *, struct usb_device *hdev,
 381                         struct usb_tt *tt, gfp_t mem_flags);
 382         int     (*reset_device)(struct usb_hcd *, struct usb_device *);
 383                 /* Notifies the HCD after a device is connected and its
 384                  * address is set
 385                  */
 386         int     (*update_device)(struct usb_hcd *, struct usb_device *);
 387         int     (*set_usb2_hw_lpm)(struct usb_hcd *, struct usb_device *, int);
 388         /* USB 3.0 Link Power Management */
 389                 /* Returns the USB3 hub-encoded value for the U1/U2 timeout. */
 390         int     (*enable_usb3_lpm_timeout)(struct usb_hcd *,
 391                         struct usb_device *, enum usb3_link_state state);
 392                 /* The xHCI host controller can still fail the command to
 393                  * disable the LPM timeouts, so this can return an error code.
 394                  */
 395         int     (*disable_usb3_lpm_timeout)(struct usb_hcd *,
 396                         struct usb_device *, enum usb3_link_state state);
 397         int     (*find_raw_port_number)(struct usb_hcd *, int);
 398         /* Call for power on/off the port if necessary */
 399         int     (*port_power)(struct usb_hcd *hcd, int portnum, bool enable);
 400
 401 };
 402
 403 static inline int hcd_giveback_urb_in_bh(struct usb_hcd *hcd)
 404 {
 405         return hcd->driver->flags & HCD_BH;
 406 }
 407
 408 static inline bool hcd_periodic_completion_in_progress(struct usb_hcd *hcd,
 409                 struct usb_host_endpoint *ep)
 410 {
 411         return hcd->high_prio_bh.completing_ep == ep;
 412 }
 413
 414 extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
 415 extern int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
 416                 int status);
 417 extern void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb);
 418
 419 extern int usb_hcd_submit_urb(struct urb *urb, gfp_t mem_flags);
 420 extern int usb_hcd_unlink_urb(struct urb *urb, int status);
 421 extern void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb,
 422                 int status);
 423 extern int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
 424                 gfp_t mem_flags);
 425 extern void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *, struct urb *);
 426 extern void usb_hcd_unmap_urb_for_dma(struct usb_hcd *, struct urb *);
 427 extern void usb_hcd_flush_endpoint(struct usb_device *udev,
 428                 struct usb_host_endpoint *ep);
 429 extern void usb_hcd_disable_endpoint(struct usb_device *udev,
 430                 struct usb_host_endpoint *ep);
 431 extern void usb_hcd_reset_endpoint(struct usb_device *udev,
 432                 struct usb_host_endpoint *ep);
 433 extern void usb_hcd_synchronize_unlinks(struct usb_device *udev);
 434 extern int usb_hcd_alloc_bandwidth(struct usb_device *udev,
 435                 struct usb_host_config *new_config,
 436                 struct usb_host_interface *old_alt,
 437                 struct usb_host_interface *new_alt);
 438 extern int usb_hcd_get_frame_number(struct usb_device *udev);
 439
 440 extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
 441                 struct device *dev, const char *bus_name);
 442 extern struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
 443                 struct device *dev, const char *bus_name,
 444                 struct usb_hcd *shared_hcd);
 445 extern struct usb_hcd *usb_get_hcd(struct usb_hcd *hcd);
 446 extern void usb_put_hcd(struct usb_hcd *hcd);
 447 extern int usb_hcd_is_primary_hcd(struct usb_hcd *hcd);
 448 extern int usb_add_hcd(struct usb_hcd *hcd,
 449                 unsigned int irqnum, unsigned long irqflags);
 450 extern void usb_remove_hcd(struct usb_hcd *hcd);
 451 extern int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1);
 452
 453 struct platform_device;
 454 extern void usb_hcd_platform_shutdown(struct platform_device *dev);
 455
 456 #ifdef CONFIG_PCI
 457 struct pci_dev;
 458 struct pci_device_id;
 459 extern int usb_hcd_pci_probe(struct pci_dev *dev,
 460                                 const struct pci_device_id *id);
 461 extern void usb_hcd_pci_remove(struct pci_dev *dev);
 462 extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
 463
 464 extern int usb_hcd_amd_remote_wakeup_quirk(struct pci_dev *dev);
 465
 466 #ifdef CONFIG_PM
 467 extern const struct dev_pm_ops usb_hcd_pci_pm_ops;
 468 #endif
 469 #endif /* CONFIG_PCI */
 470
 471 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
 472 void usb_init_pool_max(void);
 473 int hcd_buffer_create(struct usb_hcd *hcd);
 474 void hcd_buffer_destroy(struct usb_hcd *hcd);
 475
 476 void *hcd_buffer_alloc(struct usb_bus *bus, size_t size,
 477         gfp_t mem_flags, dma_addr_t *dma);
 478 void hcd_buffer_free(struct usb_bus *bus, size_t size,
 479         void *addr, dma_addr_t dma);
 480
 481 /* generic bus glue, needed for host controllers that don't use PCI */
 482 extern irqreturn_t usb_hcd_irq(int irq, void *__hcd);
 483
 484 extern void usb_hc_died(struct usb_hcd *hcd);
 485 extern void usb_hcd_poll_rh_status(struct usb_hcd *hcd);
 486 extern void usb_wakeup_notification(struct usb_device *hdev,
 487                 unsigned int portnum);
 488
 489 extern void usb_hcd_start_port_resume(struct usb_bus *bus, int portnum);
 490 extern void usb_hcd_end_port_resume(struct usb_bus *bus, int portnum);
 491
 492 /* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
 493 #define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
 494 #define usb_dotoggle(dev, ep, out)  ((dev)->toggle[out] ^= (1 << (ep)))
 495 #define usb_settoggle(dev, ep, out, bit) \
 496                 ((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | \
 497                  ((bit) << (ep)))
 498
 499 /* -------------------------------------------------------------------------- */
 500
 501 /* Enumeration is only for the hub driver, or HCD virtual root hubs */
 502 extern struct usb_device *usb_alloc_dev(struct usb_device *parent,
 503                                         struct usb_bus *, unsigned port);
 504 extern int usb_new_device(struct usb_device *dev);
 505 extern void usb_disconnect(struct usb_device **);
 506
 507 extern int usb_get_configuration(struct usb_device *dev);
 508 extern void usb_destroy_configuration(struct usb_device *dev);
 509
 510 /*-------------------------------------------------------------------------*/
 511
 512 /*
 513  * HCD Root Hub support
 514  */
 515
 516 #include <linux/usb/ch11.h>
 517
 518 /*
 519  * As of USB 2.0, full/low speed devices are segregated into trees.
 520  * One type grows from USB 1.1 host controllers (OHCI, UHCI etc).
 521  * The other type grows from high speed hubs when they connect to
 522  * full/low speed devices using "Transaction Translators" (TTs).
 523  *
 524  * TTs should only be known to the hub driver, and high speed bus
 525  * drivers (only EHCI for now).  They affect periodic scheduling and
 526  * sometimes control/bulk error recovery.
 527  */
 528
 529 struct usb_device;
 530
 531 struct usb_tt {
 532         struct usb_device       *hub;   /* upstream highspeed hub */
 533         int                     multi;  /* true means one TT per port */
 534         unsigned                think_time;     /* think time in ns */
 535         void                    *hcpriv;        /* HCD private data */
 536
 537         /* for control/bulk error recovery (CLEAR_TT_BUFFER) */
 538         spinlock_t              lock;
 539         struct list_head        clear_list;     /* of usb_tt_clear */
 540         struct work_struct      clear_work;
 541 };
 542
 543 struct usb_tt_clear {
 544         struct list_head        clear_list;
 545         unsigned                tt;
 546         u16                     devinfo;
 547         struct usb_hcd          *hcd;
 548         struct usb_host_endpoint        *ep;
 549 };
 550
 551 extern int usb_hub_clear_tt_buffer(struct urb *urb);
 552 extern void usb_ep0_reinit(struct usb_device *);
 553
 554 /* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
 555 #define DeviceRequest \
 556         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
 557 #define DeviceOutRequest \
 558         ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
 559
 560 #define InterfaceRequest \
 561         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 562
 563 #define EndpointRequest \
 564         ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 565 #define EndpointOutRequest \
 566         ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
 567
 568 /* class requests from the USB 2.0 hub spec, table 11-15 */
 569 /* GetBusState and SetHubDescriptor are optional, omitted */
 570 #define ClearHubFeature         (0x2000 | USB_REQ_CLEAR_FEATURE)
 571 #define ClearPortFeature        (0x2300 | USB_REQ_CLEAR_FEATURE)
 572 #define GetHubDescriptor        (0xa000 | USB_REQ_GET_DESCRIPTOR)
 573 #define GetHubStatus            (0xa000 | USB_REQ_GET_STATUS)
 574 #define GetPortStatus           (0xa300 | USB_REQ_GET_STATUS)
 575 #define SetHubFeature           (0x2000 | USB_REQ_SET_FEATURE)
 576 #define SetPortFeature          (0x2300 | USB_REQ_SET_FEATURE)
 577
 578
 579 /*-------------------------------------------------------------------------*/
 580
 581 /* class requests from USB 3.1 hub spec, table 10-7 */
 582 #define SetHubDepth             (0x2000 | HUB_SET_DEPTH)
 583 #define GetPortErrorCount       (0xa300 | HUB_GET_PORT_ERR_COUNT)
 584
 585 /*
 586  * Generic bandwidth allocation constants/support
 587  */
 588 #define FRAME_TIME_USECS        1000L
 589 #define BitTime(bytecount) (7 * 8 * bytecount / 6) /* with integer truncation */
 590                 /* Trying not to use worst-case bit-stuffing
 591                  * of (7/6 * 8 * bytecount) = 9.33 * bytecount */
 592                 /* bytecount = data payload byte count */
 593
 594 #define NS_TO_US(ns)    DIV_ROUND_UP(ns, 1000L)
 595                         /* convert nanoseconds to microseconds, rounding up */
 596
 597 /*
 598  * Full/low speed bandwidth allocation constants/support.
 599  */
 600 #define BW_HOST_DELAY   1000L           /* nanoseconds */
 601 #define BW_HUB_LS_SETUP 333L            /* nanoseconds */
 602                         /* 4 full-speed bit times (est.) */
 603
 604 #define FRAME_TIME_BITS                 12000L  /* frame = 1 millisecond */
 605 #define FRAME_TIME_MAX_BITS_ALLOC       (90L * FRAME_TIME_BITS / 100L)
 606 #define FRAME_TIME_MAX_USECS_ALLOC      (90L * FRAME_TIME_USECS / 100L)
 607
 608 /*
 609  * Ceiling [nano/micro]seconds (typical) for that many bytes at high speed
 610  * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
 611  * to preallocate bandwidth)
 612  */
 613 #define USB2_HOST_DELAY 5       /* nsec, guess */
 614 #define HS_NSECS(bytes) (((55 * 8 * 2083) \
 615         + (2083UL * (3 + BitTime(bytes))))/1000 \
 616         + USB2_HOST_DELAY)
 617 #define HS_NSECS_ISO(bytes) (((38 * 8 * 2083) \
 618         + (2083UL * (3 + BitTime(bytes))))/1000 \
 619         + USB2_HOST_DELAY)
 620 #define HS_USECS(bytes)         NS_TO_US(HS_NSECS(bytes))
 621 #define HS_USECS_ISO(bytes)     NS_TO_US(HS_NSECS_ISO(bytes))
 622
 623 extern long usb_calc_bus_time(int speed, int is_input,
 624                         int isoc, int bytecount);
 625
 626 /*-------------------------------------------------------------------------*/
 627
 628 extern void usb_set_device_state(struct usb_device *udev,
 629                 enum usb_device_state new_state);
 630
 631 /*-------------------------------------------------------------------------*/
 632
 633 /* exported only within usbcore */
 634
 635 extern struct idr usb_bus_idr;
 636 extern struct mutex usb_bus_idr_lock;
 637 extern wait_queue_head_t usb_kill_urb_queue;
 638
 639
 640 #define usb_endpoint_out(ep_dir)        (!((ep_dir) & USB_DIR_IN))
 641
 642 #ifdef CONFIG_PM
 643 extern void usb_root_hub_lost_power(struct usb_device *rhdev);
 644 extern int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg);
 645 extern int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg);
 646 extern void usb_hcd_resume_root_hub(struct usb_hcd *hcd);
 647 #else
 648 static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
 649 {
 650         return;
 651 }
 652 #endif /* CONFIG_PM */
 653
 654 /*-------------------------------------------------------------------------*/
 655
 656 #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
 657
 658 struct usb_mon_operations {
 659         void (*urb_submit)(struct usb_bus *bus, struct urb *urb);
 660         void (*urb_submit_error)(struct usb_bus *bus, struct urb *urb, int err);
 661         void (*urb_complete)(struct usb_bus *bus, struct urb *urb, int status);
 662         /* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
 663 };
 664
 665 extern const struct usb_mon_operations *mon_ops;
 666
 667 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb)
 668 {
 669         if (bus->monitored)
 670                 (*mon_ops->urb_submit)(bus, urb);
 671 }
 672
 673 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
 674     int error)
 675 {
 676         if (bus->monitored)
 677                 (*mon_ops->urb_submit_error)(bus, urb, error);
 678 }
 679
 680 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
 681                 int status)
 682 {
 683         if (bus->monitored)
 684                 (*mon_ops->urb_complete)(bus, urb, status);
 685 }
 686
 687 int usb_mon_register(const struct usb_mon_operations *ops);
 688 void usb_mon_deregister(void);
 689
 690 #else
 691
 692 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb) {}
 693 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
 694     int error) {}
 695 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
 696                 int status) {}
 697
 698 #endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
 699
 700 /*-------------------------------------------------------------------------*/
 701
 702 /* random stuff */
 703
 704 #define RUN_CONTEXT (in_irq() ? "in_irq" \
 705                 : (in_interrupt() ? "in_interrupt" : "can sleep"))
 706
 707
 708 /* This rwsem is for use only by the hub driver and ehci-hcd.
 709  * Nobody else should touch it.
 710  */
 711 extern struct rw_semaphore ehci_cf_port_reset_rwsem;
 712
 713 /* Keep track of which host controller drivers are loaded */
 714 #define USB_UHCI_LOADED         0
 715 #define USB_OHCI_LOADED         1
 716 #define USB_EHCI_LOADED         2
 717 extern unsigned long usb_hcds_loaded;
 718
 719 #endif /* __KERNEL__ */
 720
 721 #endif /* __USB_CORE_HCD_H */