release/src-rt-6.x.4708/linux/linux-2.6.36/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                amd_l1_fix:1;
 134         unsigned                fs_i_thresh:1;  /* Intel iso scheduling */
 135
 136         /* required for usb32 quirk */
 137         #define OHCI_CTRL_HCFS          (3 << 6)
 138         #define OHCI_USB_OPER           (2 << 6)
 139         #define OHCI_USB_SUSPEND        (3 << 6)
 140
 141         #define OHCI_HCCTRL_OFFSET      0x4
 142         #define OHCI_HCCTRL_LEN         0x4
 143         __hc32                  *ohci_hcctrl_reg;
 144         unsigned                has_hostpc:1;
 145         unsigned                has_lpm:1;  /* support link power management */
 146         unsigned                has_ppcd:1; /* support per-port change bits */
 147         u8                      sbrn;           /* packed release number */
 148
 149         /* irq statistics */
 150 #ifdef EHCI_STATS
 151         struct ehci_stats       stats;
 152 #       define COUNT(x) do { (x)++; } while (0)
 153 #else
 154 #       define COUNT(x) do {} while (0)
 155 #endif
 156
 157         /* debug files */
 158 #ifdef DEBUG
 159         struct dentry           *debug_dir;
 160 #endif
 161 };
 162
 163 /* convert between an HCD pointer and the corresponding EHCI_HCD */
 164 static inline struct ehci_hcd *hcd_to_ehci (struct usb_hcd *hcd)
 165 {
 166         return (struct ehci_hcd *) (hcd->hcd_priv);
 167 }
 168 static inline struct usb_hcd *ehci_to_hcd (struct ehci_hcd *ehci)
 169 {
 170         return container_of ((void *) ehci, struct usb_hcd, hcd_priv);
 171 }
 172
 173
 174 static inline void
 175 iaa_watchdog_start(struct ehci_hcd *ehci)
 176 {
 177         WARN_ON(timer_pending(&ehci->iaa_watchdog));
 178         mod_timer(&ehci->iaa_watchdog,
 179                         jiffies + msecs_to_jiffies(EHCI_IAA_MSECS));
 180 }
 181
 182 static inline void iaa_watchdog_done(struct ehci_hcd *ehci)
 183 {
 184         del_timer(&ehci->iaa_watchdog);
 185 }
 186
 187 enum ehci_timer_action {
 188         TIMER_IO_WATCHDOG,
 189         TIMER_ASYNC_SHRINK,
 190         TIMER_ASYNC_OFF,
 191 };
 192
 193 static inline void
 194 timer_action_done (struct ehci_hcd *ehci, enum ehci_timer_action action)
 195 {
 196         clear_bit (action, &ehci->actions);
 197 }
 198
 199 static void free_cached_lists(struct ehci_hcd *ehci);
 200
 201 /*-------------------------------------------------------------------------*/
 202
 203 #include <linux/usb/ehci_def.h>
 204
 205 /*-------------------------------------------------------------------------*/
 206
 207 #define QTD_NEXT(ehci, dma)     cpu_to_hc32(ehci, (u32)dma)
 208
 209 /*
 210  * EHCI Specification 0.95 Section 3.5
 211  * QTD: describe data transfer components (buffer, direction, ...)
 212  * See Fig 3-6 "Queue Element Transfer Descriptor Block Diagram".
 213  *
 214  * These are associated only with "QH" (Queue Head) structures,
 215  * used with control, bulk, and interrupt transfers.
 216  */
 217 struct ehci_qtd {
 218         /* first part defined by EHCI spec */
 219         __hc32                  hw_next;        /* see EHCI 3.5.1 */
 220         __hc32                  hw_alt_next;    /* see EHCI 3.5.2 */
 221         __hc32                  hw_token;       /* see EHCI 3.5.3 */
 222 #define QTD_TOGGLE      (1 << 31)       /* data toggle */
 223 #define QTD_LENGTH(tok) (((tok)>>16) & 0x7fff)
 224 #define QTD_IOC         (1 << 15)       /* interrupt on complete */
 225 #define QTD_CERR(tok)   (((tok)>>10) & 0x3)
 226 #define QTD_PID(tok)    (((tok)>>8) & 0x3)
 227 #define QTD_STS_ACTIVE  (1 << 7)        /* HC may execute this */
 228 #define QTD_STS_HALT    (1 << 6)        /* halted on error */
 229 #define QTD_STS_DBE     (1 << 5)        /* data buffer error (in HC) */
 230 #define QTD_STS_BABBLE  (1 << 4)        /* device was babbling (qtd halted) */
 231 #define QTD_STS_XACT    (1 << 3)        /* device gave illegal response */
 232 #define QTD_STS_MMF     (1 << 2)        /* incomplete split transaction */
 233 #define QTD_STS_STS     (1 << 1)        /* split transaction state */
 234 #define QTD_STS_PING    (1 << 0)        /* issue PING? */
 235
 236 #define ACTIVE_BIT(ehci)        cpu_to_hc32(ehci, QTD_STS_ACTIVE)
 237 #define HALT_BIT(ehci)          cpu_to_hc32(ehci, QTD_STS_HALT)
 238 #define STATUS_BIT(ehci)        cpu_to_hc32(ehci, QTD_STS_STS)
 239
 240         __hc32                  hw_buf [5];        /* see EHCI 3.5.4 */
 241         __hc32                  hw_buf_hi [5];        /* Appendix B */
 242
 243         /* the rest is HCD-private */
 244         dma_addr_t              qtd_dma;                /* qtd address */
 245         struct list_head        qtd_list;               /* sw qtd list */
 246         struct urb              *urb;                   /* qtd's urb */
 247         size_t                  length;                 /* length of buffer */
 248 } __attribute__ ((aligned (32)));
 249
 250 /* mask NakCnt+T in qh->hw_alt_next */
 251 #define QTD_MASK(ehci)  cpu_to_hc32 (ehci, ~0x1f)
 252
 253 #define IS_SHORT_READ(token) (QTD_LENGTH (token) != 0 && QTD_PID (token) == 1)
 254
 255 /*-------------------------------------------------------------------------*/
 256
 257 /* type tag from {qh,itd,sitd,fstn}->hw_next */
 258 #define Q_NEXT_TYPE(ehci,dma)   ((dma) & cpu_to_hc32(ehci, 3 << 1))
 259
 260 /*
 261  * Now the following defines are not converted using the
 262  * cpu_to_le32() macro anymore, since we have to support
 263  * "dynamic" switching between be and le support, so that the driver
 264  * can be used on one system with SoC EHCI controller using big-endian
 265  * descriptors as well as a normal little-endian PCI EHCI controller.
 266  */
 267 /* values for that type tag */
 268 #define Q_TYPE_ITD      (0 << 1)
 269 #define Q_TYPE_QH       (1 << 1)
 270 #define Q_TYPE_SITD     (2 << 1)
 271 #define Q_TYPE_FSTN     (3 << 1)
 272
 273 /* next async queue entry, or pointer to interrupt/periodic QH */
 274 #define QH_NEXT(ehci,dma)       (cpu_to_hc32(ehci, (((u32)dma)&~0x01f)|Q_TYPE_QH))
 275
 276 /* for periodic/async schedules and qtd lists, mark end of list */
 277 #define EHCI_LIST_END(ehci)     cpu_to_hc32(ehci, 1) /* "null pointer" to hw */
 278
 279 /*
 280  * Entries in periodic shadow table are pointers to one of four kinds
 281  * of data structure.  That's dictated by the hardware; a type tag is
 282  * encoded in the low bits of the hardware's periodic schedule.  Use
 283  * Q_NEXT_TYPE to get the tag.
 284  *
 285  * For entries in the async schedule, the type tag always says "qh".
 286  */
 287 union ehci_shadow {
 288         struct ehci_qh          *qh;            /* Q_TYPE_QH */
 289         struct ehci_itd         *itd;           /* Q_TYPE_ITD */
 290         struct ehci_sitd        *sitd;          /* Q_TYPE_SITD */
 291         struct ehci_fstn        *fstn;          /* Q_TYPE_FSTN */
 292         __hc32                  *hw_next;       /* (all types) */
 293         void                    *ptr;
 294 };
 295
 296 /*-------------------------------------------------------------------------*/
 297
 298 /*
 299  * EHCI Specification 0.95 Section 3.6
 300  * QH: describes control/bulk/interrupt endpoints
 301  * See Fig 3-7 "Queue Head Structure Layout".
 302  *
 303  * These appear in both the async and (for interrupt) periodic schedules.
 304  */
 305
 306 /* first part defined by EHCI spec */
 307 struct ehci_qh_hw {
 308         __hc32                  hw_next;        /* see EHCI 3.6.1 */
 309         __hc32                  hw_info1;       /* see EHCI 3.6.2 */
 310 #define QH_HEAD         0x00008000
 311         __hc32                  hw_info2;        /* see EHCI 3.6.2 */
 312 #define QH_SMASK        0x000000ff
 313 #define QH_CMASK        0x0000ff00
 314 #define QH_HUBADDR      0x007f0000
 315 #define QH_HUBPORT      0x3f800000
 316 #define QH_MULT         0xc0000000
 317         __hc32                  hw_current;     /* qtd list - see EHCI 3.6.4 */
 318
 319         /* qtd overlay (hardware parts of a struct ehci_qtd) */
 320         __hc32                  hw_qtd_next;
 321         __hc32                  hw_alt_next;
 322         __hc32                  hw_token;
 323         __hc32                  hw_buf [5];
 324         __hc32                  hw_buf_hi [5];
 325 } __attribute__ ((aligned(32)));
 326
 327 struct ehci_qh {
 328         struct ehci_qh_hw       *hw;
 329         /* the rest is HCD-private */
 330         dma_addr_t              qh_dma;         /* address of qh */
 331         union ehci_shadow       qh_next;        /* ptr to qh; or periodic */
 332         struct list_head        qtd_list;       /* sw qtd list */
 333         struct ehci_qtd         *dummy;
 334         struct ehci_qh          *reclaim;       /* next to reclaim */
 335
 336         struct ehci_hcd         *ehci;
 337
 338         /*
 339          * Do NOT use atomic operations for QH refcounting. On some CPUs
 340          * (PPC7448 for example), atomic operations cannot be performed on
 341          * memory that is cache-inhibited (i.e. being used for DMA).
 342          * Spinlocks are used to protect all QH fields.
 343          */
 344         u32                     refcount;
 345         unsigned                stamp;
 346
 347         u8                      needs_rescan;   /* Dequeue during giveback */
 348         u8                      qh_state;
 349 #define QH_STATE_LINKED         1               /* HC sees this */
 350 #define QH_STATE_UNLINK         2               /* HC may still see this */
 351 #define QH_STATE_IDLE           3               /* HC doesn't see this */
 352 #define QH_STATE_UNLINK_WAIT    4               /* LINKED and on reclaim q */
 353 #define QH_STATE_COMPLETING     5               /* don't touch token.HALT */
 354
 355         u8                      xacterrs;       /* XactErr retry counter */
 356 #define QH_XACTERR_MAX          32              /* XactErr retry limit */
 357
 358         /* periodic schedule info */
 359         u8                      usecs;          /* intr bandwidth */
 360         u8                      gap_uf;         /* uframes split/csplit gap */
 361         u8                      c_usecs;        /* ... split completion bw */
 362         u16                     tt_usecs;       /* tt downstream bandwidth */
 363         unsigned short          period;         /* polling interval */
 364         unsigned short          start;          /* where polling starts */
 365 #define NO_FRAME ((unsigned short)~0)                   /* pick new start */
 366
 367         struct usb_device       *dev;           /* access to TT */
 368         unsigned                clearing_tt:1;  /* Clear-TT-Buf in progress */
 369 };
 370
 371 /*-------------------------------------------------------------------------*/
 372
 373 /* description of one iso transaction (up to 3 KB data if highspeed) */
 374 struct ehci_iso_packet {
 375         /* These will be copied to iTD when scheduling */
 376         u64                     bufp;           /* itd->hw_bufp{,_hi}[pg] |= */
 377         __hc32                  transaction;    /* itd->hw_transaction[i] |= */
 378         u8                      cross;          /* buf crosses pages */
 379         /* for full speed OUT splits */
 380         u32                     buf1;
 381 };
 382
 383 /* temporary schedule data for packets from iso urbs (both speeds)
 384  * each packet is one logical usb transaction to the device (not TT),
 385  * beginning at stream->next_uframe
 386  */
 387 struct ehci_iso_sched {
 388         struct list_head        td_list;
 389         unsigned                span;
 390         struct ehci_iso_packet  packet [0];
 391 };
 392
 393 /*
 394  * ehci_iso_stream - groups all (s)itds for this endpoint.
 395  * acts like a qh would, if EHCI had them for ISO.
 396  */
 397 struct ehci_iso_stream {
 398         /* first field matches ehci_hq, but is NULL */
 399         struct ehci_qh_hw       *hw;
 400
 401         u32                     refcount;
 402         u8                      bEndpointAddress;
 403         u8                      highspeed;
 404         struct list_head        td_list;        /* queued itds/sitds */
 405         struct list_head        free_list;      /* list of unused itds/sitds */
 406         struct usb_device       *udev;
 407         struct usb_host_endpoint *ep;
 408
 409         /* output of (re)scheduling */
 410         int                     next_uframe;
 411         __hc32                  splits;
 412
 413         /* the rest is derived from the endpoint descriptor,
 414          * trusting urb->interval == f(epdesc->bInterval) and
 415          * including the extra info for hw_bufp[0..2]
 416          */
 417         u8                      usecs, c_usecs;
 418         u16                     interval;
 419         u16                     tt_usecs;
 420         u16                     maxp;
 421         u16                     raw_mask;
 422         unsigned                bandwidth;
 423
 424         /* This is used to initialize iTD's hw_bufp fields */
 425         __hc32                  buf0;
 426         __hc32                  buf1;
 427         __hc32                  buf2;
 428
 429         /* this is used to initialize sITD's tt info */
 430         __hc32                  address;
 431 };
 432
 433 /*-------------------------------------------------------------------------*/
 434
 435 /*
 436  * EHCI Specification 0.95 Section 3.3
 437  * Fig 3-4 "Isochronous Transaction Descriptor (iTD)"
 438  *
 439  * Schedule records for high speed iso xfers
 440  */
 441 struct ehci_itd {
 442         /* first part defined by EHCI spec */
 443         __hc32                  hw_next;           /* see EHCI 3.3.1 */
 444         __hc32                  hw_transaction [8]; /* see EHCI 3.3.2 */
 445 #define EHCI_ISOC_ACTIVE        (1<<31)        /* activate transfer this slot */
 446 #define EHCI_ISOC_BUF_ERR       (1<<30)        /* Data buffer error */
 447 #define EHCI_ISOC_BABBLE        (1<<29)        /* babble detected */
 448 #define EHCI_ISOC_XACTERR       (1<<28)        /* XactErr - transaction error */
 449 #define EHCI_ITD_LENGTH(tok)    (((tok)>>16) & 0x0fff)
 450 #define EHCI_ITD_IOC            (1 << 15)       /* interrupt on complete */
 451
 452 #define ITD_ACTIVE(ehci)        cpu_to_hc32(ehci, EHCI_ISOC_ACTIVE)
 453
 454         __hc32                  hw_bufp [7];    /* see EHCI 3.3.3 */
 455         __hc32                  hw_bufp_hi [7]; /* Appendix B */
 456
 457         /* the rest is HCD-private */
 458         dma_addr_t              itd_dma;        /* for this itd */
 459         union ehci_shadow       itd_next;       /* ptr to periodic q entry */
 460
 461         struct urb              *urb;
 462         struct ehci_iso_stream  *stream;        /* endpoint's queue */
 463         struct list_head        itd_list;       /* list of stream's itds */
 464
 465         /* any/all hw_transactions here may be used by that urb */
 466         unsigned                frame;          /* where scheduled */
 467         unsigned                pg;
 468         unsigned                index[8];       /* in urb->iso_frame_desc */
 469 } __attribute__ ((aligned (32)));
 470
 471 /*-------------------------------------------------------------------------*/
 472
 473 /*
 474  * EHCI Specification 0.95 Section 3.4
 475  * siTD, aka split-transaction isochronous Transfer Descriptor
 476  *       ... describe full speed iso xfers through TT in hubs
 477  * see Figure 3-5 "Split-transaction Isochronous Transaction Descriptor (siTD)
 478  */
 479 struct ehci_sitd {
 480         /* first part defined by EHCI spec */
 481         __hc32                  hw_next;
 482 /* uses bit field macros above - see EHCI 0.95 Table 3-8 */
 483         __hc32                  hw_fullspeed_ep;        /* EHCI table 3-9 */
 484         __hc32                  hw_uframe;              /* EHCI table 3-10 */
 485         __hc32                  hw_results;             /* EHCI table 3-11 */
 486 #define SITD_IOC        (1 << 31)       /* interrupt on completion */
 487 #define SITD_PAGE       (1 << 30)       /* buffer 0/1 */
 488 #define SITD_LENGTH(x)  (0x3ff & ((x)>>16))
 489 #define SITD_STS_ACTIVE (1 << 7)        /* HC may execute this */
 490 #define SITD_STS_ERR    (1 << 6)        /* error from TT */
 491 #define SITD_STS_DBE    (1 << 5)        /* data buffer error (in HC) */
 492 #define SITD_STS_BABBLE (1 << 4)        /* device was babbling */
 493 #define SITD_STS_XACT   (1 << 3)        /* illegal IN response */
 494 #define SITD_STS_MMF    (1 << 2)        /* incomplete split transaction */
 495 #define SITD_STS_STS    (1 << 1)        /* split transaction state */
 496
 497 #define SITD_ACTIVE(ehci)       cpu_to_hc32(ehci, SITD_STS_ACTIVE)
 498
 499         __hc32                  hw_buf [2];             /* EHCI table 3-12 */
 500         __hc32                  hw_backpointer;         /* EHCI table 3-13 */
 501         __hc32                  hw_buf_hi [2];          /* Appendix B */
 502
 503         /* the rest is HCD-private */
 504         dma_addr_t              sitd_dma;
 505         union ehci_shadow       sitd_next;      /* ptr to periodic q entry */
 506
 507         struct urb              *urb;
 508         struct ehci_iso_stream  *stream;        /* endpoint's queue */
 509         struct list_head        sitd_list;      /* list of stream's sitds */
 510         unsigned                frame;
 511         unsigned                index;
 512 } __attribute__ ((aligned (32)));
 513
 514 /*-------------------------------------------------------------------------*/
 515
 516 /*
 517  * EHCI Specification 0.96 Section 3.7
 518  * Periodic Frame Span Traversal Node (FSTN)
 519  *
 520  * Manages split interrupt transactions (using TT) that span frame boundaries
 521  * into uframes 0/1; see 4.12.2.2.  In those uframes, a "save place" FSTN
 522  * makes the HC jump (back) to a QH to scan for fs/ls QH completions until
 523  * it hits a "restore" FSTN; then it returns to finish other uframe 0/1 work.
 524  */
 525 struct ehci_fstn {
 526         __hc32                  hw_next;        /* any periodic q entry */
 527         __hc32                  hw_prev;        /* qh or EHCI_LIST_END */
 528
 529         /* the rest is HCD-private */
 530         dma_addr_t              fstn_dma;
 531         union ehci_shadow       fstn_next;      /* ptr to periodic q entry */
 532 } __attribute__ ((aligned (32)));
 533
 534 /*-------------------------------------------------------------------------*/
 535
 536 /* Prepare the PORTSC wakeup flags during controller suspend/resume */
 537
 538 #define ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup)      \
 539                 ehci_adjust_port_wakeup_flags(ehci, true, do_wakeup);
 540
 541 #define ehci_prepare_ports_for_controller_resume(ehci)                  \
 542                 ehci_adjust_port_wakeup_flags(ehci, false, false);
 543
 544 /*-------------------------------------------------------------------------*/
 545
 546 #ifdef CONFIG_USB_EHCI_ROOT_HUB_TT
 547
 548 /*
 549  * Some EHCI controllers have a Transaction Translator built into the
 550  * root hub. This is a non-standard feature.  Each controller will need
 551  * to add code to the following inline functions, and call them as
 552  * needed (mostly in root hub code).
 553  */
 554
 555 #define ehci_is_TDI(e)                  (ehci_to_hcd(e)->has_tt)
 556
 557 /* Returns the speed of a device attached to a port on the root hub. */
 558 static inline unsigned int
 559 ehci_port_speed(struct ehci_hcd *ehci, unsigned int portsc)
 560 {
 561         if (ehci_is_TDI(ehci)) {
 562                 switch ((portsc >> (ehci->has_hostpc ? 25 : 26)) & 3) {
 563                 case 0:
 564                         return 0;
 565                 case 1:
 566                         return USB_PORT_STAT_LOW_SPEED;
 567                 case 2:
 568                 default:
 569                         return USB_PORT_STAT_HIGH_SPEED;
 570                 }
 571         }
 572         return USB_PORT_STAT_HIGH_SPEED;
 573 }
 574
 575 #else
 576
 577 #define ehci_is_TDI(e)                  (0)
 578
 579 #define ehci_port_speed(ehci, portsc)   USB_PORT_STAT_HIGH_SPEED
 580 #endif
 581
 582 /*-------------------------------------------------------------------------*/
 583
 584 #ifdef CONFIG_PPC_83xx
 585 /* Some Freescale processors have an erratum in which the TT
 586  * port number in the queue head was 0..N-1 instead of 1..N.
 587  */
 588 #define ehci_has_fsl_portno_bug(e)              ((e)->has_fsl_port_bug)
 589 #else
 590 #define ehci_has_fsl_portno_bug(e)              (0)
 591 #endif
 592
 593 /*
 594  * While most USB host controllers implement their registers in
 595  * little-endian format, a minority (celleb companion chip) implement
 596  * them in big endian format.
 597  *
 598  * This attempts to support either format at compile time without a
 599  * runtime penalty, or both formats with the additional overhead
 600  * of checking a flag bit.
 601  */
 602
 603 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 604 #define ehci_big_endian_mmio(e)         ((e)->big_endian_mmio)
 605 #else
 606 #define ehci_big_endian_mmio(e)         0
 607 #endif
 608
 609 /*
 610  * Big-endian read/write functions are arch-specific.
 611  * Other arches can be added if/when they're needed.
 612  */
 613 #if defined(CONFIG_ARM) && defined(CONFIG_ARCH_IXP4XX)
 614 #define readl_be(addr)          __raw_readl((__force unsigned *)addr)
 615 #define writel_be(val, addr)    __raw_writel(val, (__force unsigned *)addr)
 616 #endif
 617
 618 static inline unsigned int ehci_readl(const struct ehci_hcd *ehci,
 619                 __u32 __iomem * regs)
 620 {
 621 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 622         return ehci_big_endian_mmio(ehci) ?
 623                 readl_be(regs) :
 624                 readl(regs);
 625 #else
 626         return readl(regs);
 627 #endif
 628 }
 629
 630 static inline void ehci_writel(const struct ehci_hcd *ehci,
 631                 const unsigned int val, __u32 __iomem *regs)
 632 {
 633 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 634         ehci_big_endian_mmio(ehci) ?
 635                 writel_be(val, regs) :
 636                 writel(val, regs);
 637 #else
 638         writel(val, regs);
 639 #endif
 640 }
 641
 642 /*
 643  * On certain ppc-44x SoC there is a HW issue, that could only worked around with
 644  * explicit suspend/operate of OHCI. This function hereby makes sense only on that arch.
 645  * Other common bits are dependant on has_amcc_usb23 quirk flag.
 646  */
 647 #ifdef CONFIG_44x
 648 static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
 649 {
 650         u32 hc_control;
 651
 652         hc_control = (readl_be(ehci->ohci_hcctrl_reg) & ~OHCI_CTRL_HCFS);
 653         if (operational)
 654                 hc_control |= OHCI_USB_OPER;
 655         else
 656                 hc_control |= OHCI_USB_SUSPEND;
 657
 658         writel_be(hc_control, ehci->ohci_hcctrl_reg);
 659         (void) readl_be(ehci->ohci_hcctrl_reg);
 660 }
 661 #else
 662 static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
 663 { }
 664 #endif
 665
 666 /*-------------------------------------------------------------------------*/
 667
 668 /*
 669  * The AMCC 440EPx not only implements its EHCI registers in big-endian
 670  * format, but also its DMA data structures (descriptors).
 671  *
 672  * EHCI controllers accessed through PCI work normally (little-endian
 673  * everywhere), so we won't bother supporting a BE-only mode for now.
 674  */
 675 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
 676 #define ehci_big_endian_desc(e)         ((e)->big_endian_desc)
 677
 678 /* cpu to ehci */
 679 static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x)
 680 {
 681         return ehci_big_endian_desc(ehci)
 682                 ? (__force __hc32)cpu_to_be32(x)
 683                 : (__force __hc32)cpu_to_le32(x);
 684 }
 685
 686 /* ehci to cpu */
 687 static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x)
 688 {
 689         return ehci_big_endian_desc(ehci)
 690                 ? be32_to_cpu((__force __be32)x)
 691                 : le32_to_cpu((__force __le32)x);
 692 }
 693
 694 static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
 695 {
 696         return ehci_big_endian_desc(ehci)
 697                 ? be32_to_cpup((__force __be32 *)x)
 698                 : le32_to_cpup((__force __le32 *)x);
 699 }
 700
 701 #else
 702
 703 /* cpu to ehci */
 704 static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x)
 705 {
 706         return cpu_to_le32(x);
 707 }
 708
 709 /* ehci to cpu */
 710 static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x)
 711 {
 712         return le32_to_cpu(x);
 713 }
 714
 715 static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
 716 {
 717         return le32_to_cpup(x);
 718 }
 719
 720 #endif
 721
 722 /*-------------------------------------------------------------------------*/
 723
 724 #ifndef DEBUG
 725 #define STUB_DEBUG_FILES
 726 #endif  /* DEBUG */
 727
 728 /*-------------------------------------------------------------------------*/
 729
 730 #endif /* __LINUX_EHCI_HCD_H */