drivers/usb/host/ehci.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 __LINUX_EHCI_HCD_H
  20 #define __LINUX_EHCI_HCD_H
  21
  22 /* definitions used for the EHCI driver */
  23
  24 /*
  25  * __hc32 and __hc16 are "Host Controller" types, they may be equivalent to
  26  * __leXX (normally) or __beXX (given EHCI_BIG_ENDIAN_DESC), depending on
  27  * the host controller implementation.
  28  *
  29  * To facilitate the strongest possible byte-order checking from "sparse"
  30  * and so on, we use __leXX unless that's not practical.
  31  */
  32 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
  33 typedef __u32 __bitwise __hc32;
  34 typedef __u16 __bitwise __hc16;
  35 #else
  36 #define __hc32  __le32
  37 #define __hc16  __le16
  38 #endif
  39
  40 /* statistics can be kept for tuning/monitoring */
  41 struct ehci_stats {
  42         /* irq usage */
  43         unsigned long           normal;
  44         unsigned long           error;
  45         unsigned long           reclaim;
  46         unsigned long           lost_iaa;
  47
  48         /* termination of urbs from core */
  49         unsigned long           complete;
  50         unsigned long           unlink;
  51 };
  52
  53 /* ehci_hcd->lock guards shared data against other CPUs:
  54  *   ehci_hcd:  async, reclaim, periodic (and shadow), ...
  55  *   usb_host_endpoint: hcpriv
  56  *   ehci_qh:   qh_next, qtd_list
  57  *   ehci_qtd:  qtd_list
  58  *
  59  * Also, hold this lock when talking to HC registers or
  60  * when updating hw_* fields in shared qh/qtd/... structures.
  61  */
  62
  63 #define EHCI_MAX_ROOT_PORTS     15              /* see HCS_N_PORTS */
  64
  65 struct ehci_hcd {                       /* one per controller */
  66         /* glue to PCI and HCD framework */
  67         struct ehci_caps __iomem *caps;
  68         struct ehci_regs __iomem *regs;
  69         struct ehci_dbg_port __iomem *debug;
  70
  71         __u32                   hcs_params;     /* cached register copy */
  72         spinlock_t              lock;
  73
  74         /* async schedule support */
  75         struct ehci_qh          *async;
  76         struct ehci_qh          *reclaim;
  77         unsigned                scanning : 1;
  78
  79         /* periodic schedule support */
  80 #define DEFAULT_I_TDPS          1024            /* some HCs can do less */
  81         unsigned                periodic_size;
  82         __hc32                  *periodic;      /* hw periodic table */
  83         dma_addr_t              periodic_dma;
  84         unsigned                i_thresh;       /* uframes HC might cache */
  85
  86         union ehci_shadow       *pshadow;       /* mirror hw periodic table */
  87         int                     next_uframe;    /* scan periodic, start here */
  88         unsigned                periodic_sched; /* periodic activity count */
  89
  90         /* list of itds & sitds completed while clock_frame was still active */
  91         struct list_head        cached_itd_list;
  92         struct list_head        cached_sitd_list;
  93         unsigned                clock_frame;
  94
  95         /* per root hub port */
  96         unsigned long           reset_done [EHCI_MAX_ROOT_PORTS];
  97
  98         /* bit vectors (one bit per port) */
  99         unsigned long           bus_suspended;          /* which ports were
 100                         already suspended at the start of a bus suspend */
 101         unsigned long           companion_ports;        /* which ports are
 102                         dedicated to the companion controller */
 103         unsigned long           owned_ports;            /* which ports are
 104                         owned by the companion during a bus suspend */
 105         unsigned long           port_c_suspend;         /* which ports have
 106                         the change-suspend feature turned on */
 107         unsigned long           suspended_ports;        /* which ports are
 108                         suspended */
 109
 110         /* per-HC memory pools (could be per-bus, but ...) */
 111         struct dma_pool         *qh_pool;       /* qh per active urb */
 112         struct dma_pool         *qtd_pool;      /* one or more per qh */
 113         struct dma_pool         *itd_pool;      /* itd per iso urb */
 114         struct dma_pool         *sitd_pool;     /* sitd per split iso urb */
 115
 116         struct timer_list       iaa_watchdog;
 117         struct timer_list       watchdog;
 118         unsigned long           actions;
 119         unsigned                stamp;
 120         unsigned                random_frame;
 121         unsigned long           next_statechange;
 122         ktime_t                 last_periodic_enable;
 123         u32                     command;
 124
 125         /* SILICON QUIRKS */
 126         unsigned                no_selective_suspend:1;
 127         unsigned                has_fsl_port_bug:1; /* FreeScale */
 128         unsigned                big_endian_mmio:1;
 129         unsigned                big_endian_desc:1;
 130         unsigned                has_amcc_usb23:1;
 131         unsigned                need_io_watchdog:1;
 132         unsigned                broken_periodic:1;
 133         unsigned                fs_i_thresh:1;  /* Intel iso scheduling */
 134
 135         /* required for usb32 quirk */
 136         #define OHCI_CTRL_HCFS          (3 << 6)
 137         #define OHCI_USB_OPER           (2 << 6)
 138         #define OHCI_USB_SUSPEND        (3 << 6)
 139
 140         #define OHCI_HCCTRL_OFFSET      0x4
 141         #define OHCI_HCCTRL_LEN         0x4
 142         __hc32                  *ohci_hcctrl_reg;
 143         unsigned                has_hostpc:1;
 144
 145         u8                      sbrn;           /* packed release number */
 146
 147         /* irq statistics */
 148 #ifdef EHCI_STATS
 149         struct ehci_stats       stats;
 150 #       define COUNT(x) do { (x)++; } while (0)
 151 #else
 152 #       define COUNT(x) do {} while (0)
 153 #endif
 154
 155         /* debug files */
 156 #ifdef DEBUG
 157         struct dentry           *debug_dir;
 158         struct dentry           *debug_async;
 159         struct dentry           *debug_periodic;
 160         struct dentry           *debug_registers;
 161 #endif
 162 };
 163
 164 /* convert between an HCD pointer and the corresponding EHCI_HCD */
 165 static inline struct ehci_hcd *hcd_to_ehci (struct usb_hcd *hcd)
 166 {
 167         return (struct ehci_hcd *) (hcd->hcd_priv);
 168 }
 169 static inline struct usb_hcd *ehci_to_hcd (struct ehci_hcd *ehci)
 170 {
 171         return container_of ((void *) ehci, struct usb_hcd, hcd_priv);
 172 }
 173
 174
 175 static inline void
 176 iaa_watchdog_start(struct ehci_hcd *ehci)
 177 {
 178         WARN_ON(timer_pending(&ehci->iaa_watchdog));
 179         mod_timer(&ehci->iaa_watchdog,
 180                         jiffies + msecs_to_jiffies(EHCI_IAA_MSECS));
 181 }
 182
 183 static inline void iaa_watchdog_done(struct ehci_hcd *ehci)
 184 {
 185         del_timer(&ehci->iaa_watchdog);
 186 }
 187
 188 enum ehci_timer_action {
 189         TIMER_IO_WATCHDOG,
 190         TIMER_ASYNC_SHRINK,
 191         TIMER_ASYNC_OFF,
 192 };
 193
 194 static inline void
 195 timer_action_done (struct ehci_hcd *ehci, enum ehci_timer_action action)
 196 {
 197         clear_bit (action, &ehci->actions);
 198 }
 199
 200 static void free_cached_lists(struct ehci_hcd *ehci);
 201
 202 /*-------------------------------------------------------------------------*/
 203
 204 #include <linux/usb/ehci_def.h>
 205
 206 /*-------------------------------------------------------------------------*/
 207
 208 #define QTD_NEXT(ehci, dma)     cpu_to_hc32(ehci, (u32)dma)
 209
 210 /*
 211  * EHCI Specification 0.95 Section 3.5
 212  * QTD: describe data transfer components (buffer, direction, ...)
 213  * See Fig 3-6 "Queue Element Transfer Descriptor Block Diagram".
 214  *
 215  * These are associated only with "QH" (Queue Head) structures,
 216  * used with control, bulk, and interrupt transfers.
 217  */
 218 struct ehci_qtd {
 219         /* first part defined by EHCI spec */
 220         __hc32                  hw_next;        /* see EHCI 3.5.1 */
 221         __hc32                  hw_alt_next;    /* see EHCI 3.5.2 */
 222         __hc32                  hw_token;       /* see EHCI 3.5.3 */
 223 #define QTD_TOGGLE      (1 << 31)       /* data toggle */
 224 #define QTD_LENGTH(tok) (((tok)>>16) & 0x7fff)
 225 #define QTD_IOC         (1 << 15)       /* interrupt on complete */
 226 #define QTD_CERR(tok)   (((tok)>>10) & 0x3)
 227 #define QTD_PID(tok)    (((tok)>>8) & 0x3)
 228 #define QTD_STS_ACTIVE  (1 << 7)        /* HC may execute this */
 229 #define QTD_STS_HALT    (1 << 6)        /* halted on error */
 230 #define QTD_STS_DBE     (1 << 5)        /* data buffer error (in HC) */
 231 #define QTD_STS_BABBLE  (1 << 4)        /* device was babbling (qtd halted) */
 232 #define QTD_STS_XACT    (1 << 3)        /* device gave illegal response */
 233 #define QTD_STS_MMF     (1 << 2)        /* incomplete split transaction */
 234 #define QTD_STS_STS     (1 << 1)        /* split transaction state */
 235 #define QTD_STS_PING    (1 << 0)        /* issue PING? */
 236
 237 #define ACTIVE_BIT(ehci)        cpu_to_hc32(ehci, QTD_STS_ACTIVE)
 238 #define HALT_BIT(ehci)          cpu_to_hc32(ehci, QTD_STS_HALT)
 239 #define STATUS_BIT(ehci)        cpu_to_hc32(ehci, QTD_STS_STS)
 240
 241         __hc32                  hw_buf [5];        /* see EHCI 3.5.4 */
 242         __hc32                  hw_buf_hi [5];        /* Appendix B */
 243
 244         /* the rest is HCD-private */
 245         dma_addr_t              qtd_dma;                /* qtd address */
 246         struct list_head        qtd_list;               /* sw qtd list */
 247         struct urb              *urb;                   /* qtd's urb */
 248         size_t                  length;                 /* length of buffer */
 249 } __attribute__ ((aligned (32)));
 250
 251 /* mask NakCnt+T in qh->hw_alt_next */
 252 #define QTD_MASK(ehci)  cpu_to_hc32 (ehci, ~0x1f)
 253
 254 #define IS_SHORT_READ(token) (QTD_LENGTH (token) != 0 && QTD_PID (token) == 1)
 255
 256 /*-------------------------------------------------------------------------*/
 257
 258 /* type tag from {qh,itd,sitd,fstn}->hw_next */
 259 #define Q_NEXT_TYPE(ehci,dma)   ((dma) & cpu_to_hc32(ehci, 3 << 1))
 260
 261 /*
 262  * Now the following defines are not converted using the
 263  * cpu_to_le32() macro anymore, since we have to support
 264  * "dynamic" switching between be and le support, so that the driver
 265  * can be used on one system with SoC EHCI controller using big-endian
 266  * descriptors as well as a normal little-endian PCI EHCI controller.
 267  */
 268 /* values for that type tag */
 269 #define Q_TYPE_ITD      (0 << 1)
 270 #define Q_TYPE_QH       (1 << 1)
 271 #define Q_TYPE_SITD     (2 << 1)
 272 #define Q_TYPE_FSTN     (3 << 1)
 273
 274 /* next async queue entry, or pointer to interrupt/periodic QH */
 275 #define QH_NEXT(ehci,dma)       (cpu_to_hc32(ehci, (((u32)dma)&~0x01f)|Q_TYPE_QH))
 276
 277 /* for periodic/async schedules and qtd lists, mark end of list */
 278 #define EHCI_LIST_END(ehci)     cpu_to_hc32(ehci, 1) /* "null pointer" to hw */
 279
 280 /*
 281  * Entries in periodic shadow table are pointers to one of four kinds
 282  * of data structure.  That's dictated by the hardware; a type tag is
 283  * encoded in the low bits of the hardware's periodic schedule.  Use
 284  * Q_NEXT_TYPE to get the tag.
 285  *
 286  * For entries in the async schedule, the type tag always says "qh".
 287  */
 288 union ehci_shadow {
 289         struct ehci_qh          *qh;            /* Q_TYPE_QH */
 290         struct ehci_itd         *itd;           /* Q_TYPE_ITD */
 291         struct ehci_sitd        *sitd;          /* Q_TYPE_SITD */
 292         struct ehci_fstn        *fstn;          /* Q_TYPE_FSTN */
 293         __hc32                  *hw_next;       /* (all types) */
 294         void                    *ptr;
 295 };
 296
 297 /*-------------------------------------------------------------------------*/
 298
 299 /*
 300  * EHCI Specification 0.95 Section 3.6
 301  * QH: describes control/bulk/interrupt endpoints
 302  * See Fig 3-7 "Queue Head Structure Layout".
 303  *
 304  * These appear in both the async and (for interrupt) periodic schedules.
 305  */
 306
 307 /* first part defined by EHCI spec */
 308 struct ehci_qh_hw {
 309         __hc32                  hw_next;        /* see EHCI 3.6.1 */
 310         __hc32                  hw_info1;       /* see EHCI 3.6.2 */
 311 #define QH_HEAD         0x00008000
 312         __hc32                  hw_info2;        /* see EHCI 3.6.2 */
 313 #define QH_SMASK        0x000000ff
 314 #define QH_CMASK        0x0000ff00
 315 #define QH_HUBADDR      0x007f0000
 316 #define QH_HUBPORT      0x3f800000
 317 #define QH_MULT         0xc0000000
 318         __hc32                  hw_current;     /* qtd list - see EHCI 3.6.4 */
 319
 320         /* qtd overlay (hardware parts of a struct ehci_qtd) */
 321         __hc32                  hw_qtd_next;
 322         __hc32                  hw_alt_next;
 323         __hc32                  hw_token;
 324         __hc32                  hw_buf [5];
 325         __hc32                  hw_buf_hi [5];
 326 } __attribute__ ((aligned(32)));
 327
 328 struct ehci_qh {
 329         struct ehci_qh_hw       *hw;
 330         /* the rest is HCD-private */
 331         dma_addr_t              qh_dma;         /* address of qh */
 332         union ehci_shadow       qh_next;        /* ptr to qh; or periodic */
 333         struct list_head        qtd_list;       /* sw qtd list */
 334         struct ehci_qtd         *dummy;
 335         struct ehci_qh          *reclaim;       /* next to reclaim */
 336
 337         struct ehci_hcd         *ehci;
 338
 339         /*
 340          * Do NOT use atomic operations for QH refcounting. On some CPUs
 341          * (PPC7448 for example), atomic operations cannot be performed on
 342          * memory that is cache-inhibited (i.e. being used for DMA).
 343          * Spinlocks are used to protect all QH fields.
 344          */
 345         u32                     refcount;
 346         unsigned                stamp;
 347
 348         u8                      needs_rescan;   /* Dequeue during giveback */
 349         u8                      qh_state;
 350 #define QH_STATE_LINKED         1               /* HC sees this */
 351 #define QH_STATE_UNLINK         2               /* HC may still see this */
 352 #define QH_STATE_IDLE           3               /* HC doesn't see this */
 353 #define QH_STATE_UNLINK_WAIT    4               /* LINKED and on reclaim q */
 354 #define QH_STATE_COMPLETING     5               /* don't touch token.HALT */
 355
 356         u8                      xacterrs;       /* XactErr retry counter */
 357 #define QH_XACTERR_MAX          32              /* XactErr retry limit */
 358
 359         /* periodic schedule info */
 360         u8                      usecs;          /* intr bandwidth */
 361         u8                      gap_uf;         /* uframes split/csplit gap */
 362         u8                      c_usecs;        /* ... split completion bw */
 363         u16                     tt_usecs;       /* tt downstream bandwidth */
 364         unsigned short          period;         /* polling interval */
 365         unsigned short          start;          /* where polling starts */
 366 #define NO_FRAME ((unsigned short)~0)                   /* pick new start */
 367
 368         struct usb_device       *dev;           /* access to TT */
 369         unsigned                clearing_tt:1;  /* Clear-TT-Buf in progress */
 370 };
 371
 372 /*-------------------------------------------------------------------------*/
 373
 374 /* description of one iso transaction (up to 3 KB data if highspeed) */
 375 struct ehci_iso_packet {
 376         /* These will be copied to iTD when scheduling */
 377         u64                     bufp;           /* itd->hw_bufp{,_hi}[pg] |= */
 378         __hc32                  transaction;    /* itd->hw_transaction[i] |= */
 379         u8                      cross;          /* buf crosses pages */
 380         /* for full speed OUT splits */
 381         u32                     buf1;
 382 };
 383
 384 /* temporary schedule data for packets from iso urbs (both speeds)
 385  * each packet is one logical usb transaction to the device (not TT),
 386  * beginning at stream->next_uframe
 387  */
 388 struct ehci_iso_sched {
 389         struct list_head        td_list;
 390         unsigned                span;
 391         struct ehci_iso_packet  packet [0];
 392 };
 393
 394 /*
 395  * ehci_iso_stream - groups all (s)itds for this endpoint.
 396  * acts like a qh would, if EHCI had them for ISO.
 397  */
 398 struct ehci_iso_stream {
 399         /* first field matches ehci_hq, but is NULL */
 400         struct ehci_qh_hw       *hw;
 401
 402         u32                     refcount;
 403         u8                      bEndpointAddress;
 404         u8                      highspeed;
 405         u16                     depth;          /* depth in uframes */
 406         struct list_head        td_list;        /* queued itds/sitds */
 407         struct list_head        free_list;      /* list of unused itds/sitds */
 408         struct usb_device       *udev;
 409         struct usb_host_endpoint *ep;
 410
 411         /* output of (re)scheduling */
 412         unsigned long           start;          /* jiffies */
 413         unsigned long           rescheduled;
 414         int                     next_uframe;
 415         __hc32                  splits;
 416
 417         /* the rest is derived from the endpoint descriptor,
 418          * trusting urb->interval == f(epdesc->bInterval) and
 419          * including the extra info for hw_bufp[0..2]
 420          */
 421         u8                      usecs, c_usecs;
 422         u16                     interval;
 423         u16                     tt_usecs;
 424         u16                     maxp;
 425         u16                     raw_mask;
 426         unsigned                bandwidth;
 427
 428         /* This is used to initialize iTD's hw_bufp fields */
 429         __hc32                  buf0;
 430         __hc32                  buf1;
 431         __hc32                  buf2;
 432
 433         /* this is used to initialize sITD's tt info */
 434         __hc32                  address;
 435 };
 436
 437 /*-------------------------------------------------------------------------*/
 438
 439 /*
 440  * EHCI Specification 0.95 Section 3.3
 441  * Fig 3-4 "Isochronous Transaction Descriptor (iTD)"
 442  *
 443  * Schedule records for high speed iso xfers
 444  */
 445 struct ehci_itd {
 446         /* first part defined by EHCI spec */
 447         __hc32                  hw_next;           /* see EHCI 3.3.1 */
 448         __hc32                  hw_transaction [8]; /* see EHCI 3.3.2 */
 449 #define EHCI_ISOC_ACTIVE        (1<<31)        /* activate transfer this slot */
 450 #define EHCI_ISOC_BUF_ERR       (1<<30)        /* Data buffer error */
 451 #define EHCI_ISOC_BABBLE        (1<<29)        /* babble detected */
 452 #define EHCI_ISOC_XACTERR       (1<<28)        /* XactErr - transaction error */
 453 #define EHCI_ITD_LENGTH(tok)    (((tok)>>16) & 0x0fff)
 454 #define EHCI_ITD_IOC            (1 << 15)       /* interrupt on complete */
 455
 456 #define ITD_ACTIVE(ehci)        cpu_to_hc32(ehci, EHCI_ISOC_ACTIVE)
 457
 458         __hc32                  hw_bufp [7];    /* see EHCI 3.3.3 */
 459         __hc32                  hw_bufp_hi [7]; /* Appendix B */
 460
 461         /* the rest is HCD-private */
 462         dma_addr_t              itd_dma;        /* for this itd */
 463         union ehci_shadow       itd_next;       /* ptr to periodic q entry */
 464
 465         struct urb              *urb;
 466         struct ehci_iso_stream  *stream;        /* endpoint's queue */
 467         struct list_head        itd_list;       /* list of stream's itds */
 468
 469         /* any/all hw_transactions here may be used by that urb */
 470         unsigned                frame;          /* where scheduled */
 471         unsigned                pg;
 472         unsigned                index[8];       /* in urb->iso_frame_desc */
 473 } __attribute__ ((aligned (32)));
 474
 475 /*-------------------------------------------------------------------------*/
 476
 477 /*
 478  * EHCI Specification 0.95 Section 3.4
 479  * siTD, aka split-transaction isochronous Transfer Descriptor
 480  *       ... describe full speed iso xfers through TT in hubs
 481  * see Figure 3-5 "Split-transaction Isochronous Transaction Descriptor (siTD)
 482  */
 483 struct ehci_sitd {
 484         /* first part defined by EHCI spec */
 485         __hc32                  hw_next;
 486 /* uses bit field macros above - see EHCI 0.95 Table 3-8 */
 487         __hc32                  hw_fullspeed_ep;        /* EHCI table 3-9 */
 488         __hc32                  hw_uframe;              /* EHCI table 3-10 */
 489         __hc32                  hw_results;             /* EHCI table 3-11 */
 490 #define SITD_IOC        (1 << 31)       /* interrupt on completion */
 491 #define SITD_PAGE       (1 << 30)       /* buffer 0/1 */
 492 #define SITD_LENGTH(x)  (0x3ff & ((x)>>16))
 493 #define SITD_STS_ACTIVE (1 << 7)        /* HC may execute this */
 494 #define SITD_STS_ERR    (1 << 6)        /* error from TT */
 495 #define SITD_STS_DBE    (1 << 5)        /* data buffer error (in HC) */
 496 #define SITD_STS_BABBLE (1 << 4)        /* device was babbling */
 497 #define SITD_STS_XACT   (1 << 3)        /* illegal IN response */
 498 #define SITD_STS_MMF    (1 << 2)        /* incomplete split transaction */
 499 #define SITD_STS_STS    (1 << 1)        /* split transaction state */
 500
 501 #define SITD_ACTIVE(ehci)       cpu_to_hc32(ehci, SITD_STS_ACTIVE)
 502
 503         __hc32                  hw_buf [2];             /* EHCI table 3-12 */
 504         __hc32                  hw_backpointer;         /* EHCI table 3-13 */
 505         __hc32                  hw_buf_hi [2];          /* Appendix B */
 506
 507         /* the rest is HCD-private */
 508         dma_addr_t              sitd_dma;
 509         union ehci_shadow       sitd_next;      /* ptr to periodic q entry */
 510
 511         struct urb              *urb;
 512         struct ehci_iso_stream  *stream;        /* endpoint's queue */
 513         struct list_head        sitd_list;      /* list of stream's sitds */
 514         unsigned                frame;
 515         unsigned                index;
 516 } __attribute__ ((aligned (32)));
 517
 518 /*-------------------------------------------------------------------------*/
 519
 520 /*
 521  * EHCI Specification 0.96 Section 3.7
 522  * Periodic Frame Span Traversal Node (FSTN)
 523  *
 524  * Manages split interrupt transactions (using TT) that span frame boundaries
 525  * into uframes 0/1; see 4.12.2.2.  In those uframes, a "save place" FSTN
 526  * makes the HC jump (back) to a QH to scan for fs/ls QH completions until
 527  * it hits a "restore" FSTN; then it returns to finish other uframe 0/1 work.
 528  */
 529 struct ehci_fstn {
 530         __hc32                  hw_next;        /* any periodic q entry */
 531         __hc32                  hw_prev;        /* qh or EHCI_LIST_END */
 532
 533         /* the rest is HCD-private */
 534         dma_addr_t              fstn_dma;
 535         union ehci_shadow       fstn_next;      /* ptr to periodic q entry */
 536 } __attribute__ ((aligned (32)));
 537
 538 /*-------------------------------------------------------------------------*/
 539
 540 /* Prepare the PORTSC wakeup flags during controller suspend/resume */
 541
 542 #define ehci_prepare_ports_for_controller_suspend(ehci)         \
 543                 ehci_adjust_port_wakeup_flags(ehci, true);
 544
 545 #define ehci_prepare_ports_for_controller_resume(ehci)          \
 546                 ehci_adjust_port_wakeup_flags(ehci, false);
 547
 548 /*-------------------------------------------------------------------------*/
 549
 550 #ifdef CONFIG_USB_EHCI_ROOT_HUB_TT
 551
 552 /*
 553  * Some EHCI controllers have a Transaction Translator built into the
 554  * root hub. This is a non-standard feature.  Each controller will need
 555  * to add code to the following inline functions, and call them as
 556  * needed (mostly in root hub code).
 557  */
 558
 559 #define ehci_is_TDI(e)                  (ehci_to_hcd(e)->has_tt)
 560
 561 /* Returns the speed of a device attached to a port on the root hub. */
 562 static inline unsigned int
 563 ehci_port_speed(struct ehci_hcd *ehci, unsigned int portsc)
 564 {
 565         if (ehci_is_TDI(ehci)) {
 566                 switch ((portsc >> (ehci->has_hostpc ? 25 : 26)) & 3) {
 567                 case 0:
 568                         return 0;
 569                 case 1:
 570                         return (1<<USB_PORT_FEAT_LOWSPEED);
 571                 case 2:
 572                 default:
 573                         return (1<<USB_PORT_FEAT_HIGHSPEED);
 574                 }
 575         }
 576         return (1<<USB_PORT_FEAT_HIGHSPEED);
 577 }
 578
 579 #else
 580
 581 #define ehci_is_TDI(e)                  (0)
 582
 583 #define ehci_port_speed(ehci, portsc)   (1<<USB_PORT_FEAT_HIGHSPEED)
 584 #endif
 585
 586 /*-------------------------------------------------------------------------*/
 587
 588 #ifdef CONFIG_PPC_83xx
 589 /* Some Freescale processors have an erratum in which the TT
 590  * port number in the queue head was 0..N-1 instead of 1..N.
 591  */
 592 #define ehci_has_fsl_portno_bug(e)              ((e)->has_fsl_port_bug)
 593 #else
 594 #define ehci_has_fsl_portno_bug(e)              (0)
 595 #endif
 596
 597 /*
 598  * While most USB host controllers implement their registers in
 599  * little-endian format, a minority (celleb companion chip) implement
 600  * them in big endian format.
 601  *
 602  * This attempts to support either format at compile time without a
 603  * runtime penalty, or both formats with the additional overhead
 604  * of checking a flag bit.
 605  */
 606
 607 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 608 #define ehci_big_endian_mmio(e)         ((e)->big_endian_mmio)
 609 #else
 610 #define ehci_big_endian_mmio(e)         0
 611 #endif
 612
 613 /*
 614  * Big-endian read/write functions are arch-specific.
 615  * Other arches can be added if/when they're needed.
 616  */
 617 #if defined(CONFIG_ARM) && defined(CONFIG_ARCH_IXP4XX)
 618 #define readl_be(addr)          __raw_readl((__force unsigned *)addr)
 619 #define writel_be(val, addr)    __raw_writel(val, (__force unsigned *)addr)
 620 #endif
 621
 622 static inline unsigned int ehci_readl(const struct ehci_hcd *ehci,
 623                 __u32 __iomem * regs)
 624 {
 625 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 626         return ehci_big_endian_mmio(ehci) ?
 627                 readl_be(regs) :
 628                 readl(regs);
 629 #else
 630         return readl(regs);
 631 #endif
 632 }
 633
 634 static inline void ehci_writel(const struct ehci_hcd *ehci,
 635                 const unsigned int val, __u32 __iomem *regs)
 636 {
 637 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 638         ehci_big_endian_mmio(ehci) ?
 639                 writel_be(val, regs) :
 640                 writel(val, regs);
 641 #else
 642         writel(val, regs);
 643 #endif
 644 }
 645
 646 /*
 647  * On certain ppc-44x SoC there is a HW issue, that could only worked around with
 648  * explicit suspend/operate of OHCI. This function hereby makes sense only on that arch.
 649  * Other common bits are dependant on has_amcc_usb23 quirk flag.
 650  */
 651 #ifdef CONFIG_44x
 652 static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
 653 {
 654         u32 hc_control;
 655
 656         hc_control = (readl_be(ehci->ohci_hcctrl_reg) & ~OHCI_CTRL_HCFS);
 657         if (operational)
 658                 hc_control |= OHCI_USB_OPER;
 659         else
 660                 hc_control |= OHCI_USB_SUSPEND;
 661
 662         writel_be(hc_control, ehci->ohci_hcctrl_reg);
 663         (void) readl_be(ehci->ohci_hcctrl_reg);
 664 }
 665 #else
 666 static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
 667 { }
 668 #endif
 669
 670 /*-------------------------------------------------------------------------*/
 671
 672 /*
 673  * The AMCC 440EPx not only implements its EHCI registers in big-endian
 674  * format, but also its DMA data structures (descriptors).
 675  *
 676  * EHCI controllers accessed through PCI work normally (little-endian
 677  * everywhere), so we won't bother supporting a BE-only mode for now.
 678  */
 679 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
 680 #define ehci_big_endian_desc(e)         ((e)->big_endian_desc)
 681
 682 /* cpu to ehci */
 683 static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x)
 684 {
 685         return ehci_big_endian_desc(ehci)
 686                 ? (__force __hc32)cpu_to_be32(x)
 687                 : (__force __hc32)cpu_to_le32(x);
 688 }
 689
 690 /* ehci to cpu */
 691 static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x)
 692 {
 693         return ehci_big_endian_desc(ehci)
 694                 ? be32_to_cpu((__force __be32)x)
 695                 : le32_to_cpu((__force __le32)x);
 696 }
 697
 698 static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
 699 {
 700         return ehci_big_endian_desc(ehci)
 701                 ? be32_to_cpup((__force __be32 *)x)
 702                 : le32_to_cpup((__force __le32 *)x);
 703 }
 704
 705 #else
 706
 707 /* cpu to ehci */
 708 static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x)
 709 {
 710         return cpu_to_le32(x);
 711 }
 712
 713 /* ehci to cpu */
 714 static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x)
 715 {
 716         return le32_to_cpu(x);
 717 }
 718
 719 static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
 720 {
 721         return le32_to_cpup(x);
 722 }
 723
 724 #endif
 725
 726 /*-------------------------------------------------------------------------*/
 727
 728 #ifndef DEBUG
 729 #define STUB_DEBUG_FILES
 730 #endif  /* DEBUG */
 731
 732 /*-------------------------------------------------------------------------*/
 733
 734 #endif /* __LINUX_EHCI_HCD_H */