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 completed while clock_frame was still active */
  91         struct list_head        cached_itd_list;
  92         unsigned                clock_frame;
  93
  94         /* per root hub port */
  95         unsigned long           reset_done [EHCI_MAX_ROOT_PORTS];
  96
  97         /* bit vectors (one bit per port) */
  98         unsigned long           bus_suspended;          /* which ports were
  99                         already suspended at the start of a bus suspend */
 100         unsigned long           companion_ports;        /* which ports are
 101                         dedicated to the companion controller */
 102         unsigned long           owned_ports;            /* which ports are
 103                         owned by the companion during a bus suspend */
 104         unsigned long           port_c_suspend;         /* which ports have
 105                         the change-suspend feature turned on */
 106         unsigned long           suspended_ports;        /* which ports are
 107                         suspended */
 108
 109         /* per-HC memory pools (could be per-bus, but ...) */
 110         struct dma_pool         *qh_pool;       /* qh per active urb */
 111         struct dma_pool         *qtd_pool;      /* one or more per qh */
 112         struct dma_pool         *itd_pool;      /* itd per iso urb */
 113         struct dma_pool         *sitd_pool;     /* sitd per split iso urb */
 114
 115         struct timer_list       iaa_watchdog;
 116         struct timer_list       watchdog;
 117         unsigned long           actions;
 118         unsigned                stamp;
 119         unsigned                random_frame;
 120         unsigned long           next_statechange;
 121         ktime_t                 last_periodic_enable;
 122         u32                     command;
 123
 124         /* SILICON QUIRKS */
 125         unsigned                no_selective_suspend:1;
 126         unsigned                has_fsl_port_bug:1; /* FreeScale */
 127         unsigned                big_endian_mmio:1;
 128         unsigned                big_endian_desc:1;
 129         unsigned                has_amcc_usb23:1;
 130         unsigned                need_io_watchdog:1;
 131         unsigned                broken_periodic:1;
 132
 133         /* required for usb32 quirk */
 134         #define OHCI_CTRL_HCFS          (3 << 6)
 135         #define OHCI_USB_OPER           (2 << 6)
 136         #define OHCI_USB_SUSPEND        (3 << 6)
 137
 138         #define OHCI_HCCTRL_OFFSET      0x4
 139         #define OHCI_HCCTRL_LEN         0x4
 140         __hc32                  *ohci_hcctrl_reg;
 141         unsigned                has_hostpc:1;
 142
 143         u8                      sbrn;           /* packed release number */
 144
 145         /* irq statistics */
 146 #ifdef EHCI_STATS
 147         struct ehci_stats       stats;
 148 #       define COUNT(x) do { (x)++; } while (0)
 149 #else
 150 #       define COUNT(x) do {} while (0)
 151 #endif
 152
 153         /* debug files */
 154 #ifdef DEBUG
 155         struct dentry           *debug_dir;
 156         struct dentry           *debug_async;
 157         struct dentry           *debug_periodic;
 158         struct dentry           *debug_registers;
 159 #endif
 160 };
 161
 162 /* convert between an HCD pointer and the corresponding EHCI_HCD */
 163 static inline struct ehci_hcd *hcd_to_ehci (struct usb_hcd *hcd)
 164 {
 165         return (struct ehci_hcd *) (hcd->hcd_priv);
 166 }
 167 static inline struct usb_hcd *ehci_to_hcd (struct ehci_hcd *ehci)
 168 {
 169         return container_of ((void *) ehci, struct usb_hcd, hcd_priv);
 170 }
 171
 172
 173 static inline void
 174 iaa_watchdog_start(struct ehci_hcd *ehci)
 175 {
 176         WARN_ON(timer_pending(&ehci->iaa_watchdog));
 177         mod_timer(&ehci->iaa_watchdog,
 178                         jiffies + msecs_to_jiffies(EHCI_IAA_MSECS));
 179 }
 180
 181 static inline void iaa_watchdog_done(struct ehci_hcd *ehci)
 182 {
 183         del_timer(&ehci->iaa_watchdog);
 184 }
 185
 186 enum ehci_timer_action {
 187         TIMER_IO_WATCHDOG,
 188         TIMER_ASYNC_SHRINK,
 189         TIMER_ASYNC_OFF,
 190 };
 191
 192 static inline void
 193 timer_action_done (struct ehci_hcd *ehci, enum ehci_timer_action action)
 194 {
 195         clear_bit (action, &ehci->actions);
 196 }
 197
 198 static void free_cached_itd_list(struct ehci_hcd *ehci);
 199
 200 /*-------------------------------------------------------------------------*/
 201
 202 #include <linux/usb/ehci_def.h>
 203
 204 /*-------------------------------------------------------------------------*/
 205
 206 #define QTD_NEXT(ehci, dma)     cpu_to_hc32(ehci, (u32)dma)
 207
 208 /*
 209  * EHCI Specification 0.95 Section 3.5
 210  * QTD: describe data transfer components (buffer, direction, ...)
 211  * See Fig 3-6 "Queue Element Transfer Descriptor Block Diagram".
 212  *
 213  * These are associated only with "QH" (Queue Head) structures,
 214  * used with control, bulk, and interrupt transfers.
 215  */
 216 struct ehci_qtd {
 217         /* first part defined by EHCI spec */
 218         __hc32                  hw_next;        /* see EHCI 3.5.1 */
 219         __hc32                  hw_alt_next;    /* see EHCI 3.5.2 */
 220         __hc32                  hw_token;       /* see EHCI 3.5.3 */
 221 #define QTD_TOGGLE      (1 << 31)       /* data toggle */
 222 #define QTD_LENGTH(tok) (((tok)>>16) & 0x7fff)
 223 #define QTD_IOC         (1 << 15)       /* interrupt on complete */
 224 #define QTD_CERR(tok)   (((tok)>>10) & 0x3)
 225 #define QTD_PID(tok)    (((tok)>>8) & 0x3)
 226 #define QTD_STS_ACTIVE  (1 << 7)        /* HC may execute this */
 227 #define QTD_STS_HALT    (1 << 6)        /* halted on error */
 228 #define QTD_STS_DBE     (1 << 5)        /* data buffer error (in HC) */
 229 #define QTD_STS_BABBLE  (1 << 4)        /* device was babbling (qtd halted) */
 230 #define QTD_STS_XACT    (1 << 3)        /* device gave illegal response */
 231 #define QTD_STS_MMF     (1 << 2)        /* incomplete split transaction */
 232 #define QTD_STS_STS     (1 << 1)        /* split transaction state */
 233 #define QTD_STS_PING    (1 << 0)        /* issue PING? */
 234
 235 #define ACTIVE_BIT(ehci)        cpu_to_hc32(ehci, QTD_STS_ACTIVE)
 236 #define HALT_BIT(ehci)          cpu_to_hc32(ehci, QTD_STS_HALT)
 237 #define STATUS_BIT(ehci)        cpu_to_hc32(ehci, QTD_STS_STS)
 238
 239         __hc32                  hw_buf [5];        /* see EHCI 3.5.4 */
 240         __hc32                  hw_buf_hi [5];        /* Appendix B */
 241
 242         /* the rest is HCD-private */
 243         dma_addr_t              qtd_dma;                /* qtd address */
 244         struct list_head        qtd_list;               /* sw qtd list */
 245         struct urb              *urb;                   /* qtd's urb */
 246         size_t                  length;                 /* length of buffer */
 247 } __attribute__ ((aligned (32)));
 248
 249 /* mask NakCnt+T in qh->hw_alt_next */
 250 #define QTD_MASK(ehci)  cpu_to_hc32 (ehci, ~0x1f)
 251
 252 #define IS_SHORT_READ(token) (QTD_LENGTH (token) != 0 && QTD_PID (token) == 1)
 253
 254 /*-------------------------------------------------------------------------*/
 255
 256 /* type tag from {qh,itd,sitd,fstn}->hw_next */
 257 #define Q_NEXT_TYPE(ehci,dma)   ((dma) & cpu_to_hc32(ehci, 3 << 1))
 258
 259 /*
 260  * Now the following defines are not converted using the
 261  * cpu_to_le32() macro anymore, since we have to support
 262  * "dynamic" switching between be and le support, so that the driver
 263  * can be used on one system with SoC EHCI controller using big-endian
 264  * descriptors as well as a normal little-endian PCI EHCI controller.
 265  */
 266 /* values for that type tag */
 267 #define Q_TYPE_ITD      (0 << 1)
 268 #define Q_TYPE_QH       (1 << 1)
 269 #define Q_TYPE_SITD     (2 << 1)
 270 #define Q_TYPE_FSTN     (3 << 1)
 271
 272 /* next async queue entry, or pointer to interrupt/periodic QH */
 273 #define QH_NEXT(ehci,dma)       (cpu_to_hc32(ehci, (((u32)dma)&~0x01f)|Q_TYPE_QH))
 274
 275 /* for periodic/async schedules and qtd lists, mark end of list */
 276 #define EHCI_LIST_END(ehci)     cpu_to_hc32(ehci, 1) /* "null pointer" to hw */
 277
 278 /*
 279  * Entries in periodic shadow table are pointers to one of four kinds
 280  * of data structure.  That's dictated by the hardware; a type tag is
 281  * encoded in the low bits of the hardware's periodic schedule.  Use
 282  * Q_NEXT_TYPE to get the tag.
 283  *
 284  * For entries in the async schedule, the type tag always says "qh".
 285  */
 286 union ehci_shadow {
 287         struct ehci_qh          *qh;            /* Q_TYPE_QH */
 288         struct ehci_itd         *itd;           /* Q_TYPE_ITD */
 289         struct ehci_sitd        *sitd;          /* Q_TYPE_SITD */
 290         struct ehci_fstn        *fstn;          /* Q_TYPE_FSTN */
 291         __hc32                  *hw_next;       /* (all types) */
 292         void                    *ptr;
 293 };
 294
 295 /*-------------------------------------------------------------------------*/
 296
 297 /*
 298  * EHCI Specification 0.95 Section 3.6
 299  * QH: describes control/bulk/interrupt endpoints
 300  * See Fig 3-7 "Queue Head Structure Layout".
 301  *
 302  * These appear in both the async and (for interrupt) periodic schedules.
 303  */
 304
 305 /* first part defined by EHCI spec */
 306 struct ehci_qh_hw {
 307         __hc32                  hw_next;        /* see EHCI 3.6.1 */
 308         __hc32                  hw_info1;       /* see EHCI 3.6.2 */
 309 #define QH_HEAD         0x00008000
 310         __hc32                  hw_info2;        /* see EHCI 3.6.2 */
 311 #define QH_SMASK        0x000000ff
 312 #define QH_CMASK        0x0000ff00
 313 #define QH_HUBADDR      0x007f0000
 314 #define QH_HUBPORT      0x3f800000
 315 #define QH_MULT         0xc0000000
 316         __hc32                  hw_current;     /* qtd list - see EHCI 3.6.4 */
 317
 318         /* qtd overlay (hardware parts of a struct ehci_qtd) */
 319         __hc32                  hw_qtd_next;
 320         __hc32                  hw_alt_next;
 321         __hc32                  hw_token;
 322         __hc32                  hw_buf [5];
 323         __hc32                  hw_buf_hi [5];
 324 } __attribute__ ((aligned(32)));
 325
 326 struct ehci_qh {
 327         struct ehci_qh_hw       *hw;
 328         /* the rest is HCD-private */
 329         dma_addr_t              qh_dma;         /* address of qh */
 330         union ehci_shadow       qh_next;        /* ptr to qh; or periodic */
 331         struct list_head        qtd_list;       /* sw qtd list */
 332         struct ehci_qtd         *dummy;
 333         struct ehci_qh          *reclaim;       /* next to reclaim */
 334
 335         struct ehci_hcd         *ehci;
 336
 337         /*
 338          * Do NOT use atomic operations for QH refcounting. On some CPUs
 339          * (PPC7448 for example), atomic operations cannot be performed on
 340          * memory that is cache-inhibited (i.e. being used for DMA).
 341          * Spinlocks are used to protect all QH fields.
 342          */
 343         u32                     refcount;
 344         unsigned                stamp;
 345
 346         u8                      needs_rescan;   /* Dequeue during giveback */
 347         u8                      qh_state;
 348 #define QH_STATE_LINKED         1               /* HC sees this */
 349 #define QH_STATE_UNLINK         2               /* HC may still see this */
 350 #define QH_STATE_IDLE           3               /* HC doesn't see this */
 351 #define QH_STATE_UNLINK_WAIT    4               /* LINKED and on reclaim q */
 352 #define QH_STATE_COMPLETING     5               /* don't touch token.HALT */
 353
 354         u8                      xacterrs;       /* XactErr retry counter */
 355 #define QH_XACTERR_MAX          32              /* XactErr retry limit */
 356
 357         /* periodic schedule info */
 358         u8                      usecs;          /* intr bandwidth */
 359         u8                      gap_uf;         /* uframes split/csplit gap */
 360         u8                      c_usecs;        /* ... split completion bw */
 361         u16                     tt_usecs;       /* tt downstream bandwidth */
 362         unsigned short          period;         /* polling interval */
 363         unsigned short          start;          /* where polling starts */
 364 #define NO_FRAME ((unsigned short)~0)                   /* pick new start */
 365
 366         struct usb_device       *dev;           /* access to TT */
 367         unsigned                clearing_tt:1;  /* Clear-TT-Buf in progress */
 368 };
 369
 370 /*-------------------------------------------------------------------------*/
 371
 372 /* description of one iso transaction (up to 3 KB data if highspeed) */
 373 struct ehci_iso_packet {
 374         /* These will be copied to iTD when scheduling */
 375         u64                     bufp;           /* itd->hw_bufp{,_hi}[pg] |= */
 376         __hc32                  transaction;    /* itd->hw_transaction[i] |= */
 377         u8                      cross;          /* buf crosses pages */
 378         /* for full speed OUT splits */
 379         u32                     buf1;
 380 };
 381
 382 /* temporary schedule data for packets from iso urbs (both speeds)
 383  * each packet is one logical usb transaction to the device (not TT),
 384  * beginning at stream->next_uframe
 385  */
 386 struct ehci_iso_sched {
 387         struct list_head        td_list;
 388         unsigned                span;
 389         struct ehci_iso_packet  packet [0];
 390 };
 391
 392 /*
 393  * ehci_iso_stream - groups all (s)itds for this endpoint.
 394  * acts like a qh would, if EHCI had them for ISO.
 395  */
 396 struct ehci_iso_stream {
 397         /* first two fields match QH, but info1 == 0 */
 398         __hc32                  hw_next;
 399         __hc32                  hw_info1;
 400
 401         u32                     refcount;
 402         u8                      bEndpointAddress;
 403         u8                      highspeed;
 404         u16                     depth;          /* depth in uframes */
 405         struct list_head        td_list;        /* queued itds/sitds */
 406         struct list_head        free_list;      /* list of unused itds/sitds */
 407         struct usb_device       *udev;
 408         struct usb_host_endpoint *ep;
 409
 410         /* output of (re)scheduling */
 411         unsigned long           start;          /* jiffies */
 412         unsigned long           rescheduled;
 413         int                     next_uframe;
 414         __hc32                  splits;
 415
 416         /* the rest is derived from the endpoint descriptor,
 417          * trusting urb->interval == f(epdesc->bInterval) and
 418          * including the extra info for hw_bufp[0..2]
 419          */
 420         u8                      usecs, c_usecs;
 421         u16                     interval;
 422         u16                     tt_usecs;
 423         u16                     maxp;
 424         u16                     raw_mask;
 425         unsigned                bandwidth;
 426
 427         /* This is used to initialize iTD's hw_bufp fields */
 428         __hc32                  buf0;
 429         __hc32                  buf1;
 430         __hc32                  buf2;
 431
 432         /* this is used to initialize sITD's tt info */
 433         __hc32                  address;
 434 };
 435
 436 /*-------------------------------------------------------------------------*/
 437
 438 /*
 439  * EHCI Specification 0.95 Section 3.3
 440  * Fig 3-4 "Isochronous Transaction Descriptor (iTD)"
 441  *
 442  * Schedule records for high speed iso xfers
 443  */
 444 struct ehci_itd {
 445         /* first part defined by EHCI spec */
 446         __hc32                  hw_next;           /* see EHCI 3.3.1 */
 447         __hc32                  hw_transaction [8]; /* see EHCI 3.3.2 */
 448 #define EHCI_ISOC_ACTIVE        (1<<31)        /* activate transfer this slot */
 449 #define EHCI_ISOC_BUF_ERR       (1<<30)        /* Data buffer error */
 450 #define EHCI_ISOC_BABBLE        (1<<29)        /* babble detected */
 451 #define EHCI_ISOC_XACTERR       (1<<28)        /* XactErr - transaction error */
 452 #define EHCI_ITD_LENGTH(tok)    (((tok)>>16) & 0x0fff)
 453 #define EHCI_ITD_IOC            (1 << 15)       /* interrupt on complete */
 454
 455 #define ITD_ACTIVE(ehci)        cpu_to_hc32(ehci, EHCI_ISOC_ACTIVE)
 456
 457         __hc32                  hw_bufp [7];    /* see EHCI 3.3.3 */
 458         __hc32                  hw_bufp_hi [7]; /* Appendix B */
 459
 460         /* the rest is HCD-private */
 461         dma_addr_t              itd_dma;        /* for this itd */
 462         union ehci_shadow       itd_next;       /* ptr to periodic q entry */
 463
 464         struct urb              *urb;
 465         struct ehci_iso_stream  *stream;        /* endpoint's queue */
 466         struct list_head        itd_list;       /* list of stream's itds */
 467
 468         /* any/all hw_transactions here may be used by that urb */
 469         unsigned                frame;          /* where scheduled */
 470         unsigned                pg;
 471         unsigned                index[8];       /* in urb->iso_frame_desc */
 472 } __attribute__ ((aligned (32)));
 473
 474 /*-------------------------------------------------------------------------*/
 475
 476 /*
 477  * EHCI Specification 0.95 Section 3.4
 478  * siTD, aka split-transaction isochronous Transfer Descriptor
 479  *       ... describe full speed iso xfers through TT in hubs
 480  * see Figure 3-5 "Split-transaction Isochronous Transaction Descriptor (siTD)
 481  */
 482 struct ehci_sitd {
 483         /* first part defined by EHCI spec */
 484         __hc32                  hw_next;
 485 /* uses bit field macros above - see EHCI 0.95 Table 3-8 */
 486         __hc32                  hw_fullspeed_ep;        /* EHCI table 3-9 */
 487         __hc32                  hw_uframe;              /* EHCI table 3-10 */
 488         __hc32                  hw_results;             /* EHCI table 3-11 */
 489 #define SITD_IOC        (1 << 31)       /* interrupt on completion */
 490 #define SITD_PAGE       (1 << 30)       /* buffer 0/1 */
 491 #define SITD_LENGTH(x)  (0x3ff & ((x)>>16))
 492 #define SITD_STS_ACTIVE (1 << 7)        /* HC may execute this */
 493 #define SITD_STS_ERR    (1 << 6)        /* error from TT */
 494 #define SITD_STS_DBE    (1 << 5)        /* data buffer error (in HC) */
 495 #define SITD_STS_BABBLE (1 << 4)        /* device was babbling */
 496 #define SITD_STS_XACT   (1 << 3)        /* illegal IN response */
 497 #define SITD_STS_MMF    (1 << 2)        /* incomplete split transaction */
 498 #define SITD_STS_STS    (1 << 1)        /* split transaction state */
 499
 500 #define SITD_ACTIVE(ehci)       cpu_to_hc32(ehci, SITD_STS_ACTIVE)
 501
 502         __hc32                  hw_buf [2];             /* EHCI table 3-12 */
 503         __hc32                  hw_backpointer;         /* EHCI table 3-13 */
 504         __hc32                  hw_buf_hi [2];          /* Appendix B */
 505
 506         /* the rest is HCD-private */
 507         dma_addr_t              sitd_dma;
 508         union ehci_shadow       sitd_next;      /* ptr to periodic q entry */
 509
 510         struct urb              *urb;
 511         struct ehci_iso_stream  *stream;        /* endpoint's queue */
 512         struct list_head        sitd_list;      /* list of stream's sitds */
 513         unsigned                frame;
 514         unsigned                index;
 515 } __attribute__ ((aligned (32)));
 516
 517 /*-------------------------------------------------------------------------*/
 518
 519 /*
 520  * EHCI Specification 0.96 Section 3.7
 521  * Periodic Frame Span Traversal Node (FSTN)
 522  *
 523  * Manages split interrupt transactions (using TT) that span frame boundaries
 524  * into uframes 0/1; see 4.12.2.2.  In those uframes, a "save place" FSTN
 525  * makes the HC jump (back) to a QH to scan for fs/ls QH completions until
 526  * it hits a "restore" FSTN; then it returns to finish other uframe 0/1 work.
 527  */
 528 struct ehci_fstn {
 529         __hc32                  hw_next;        /* any periodic q entry */
 530         __hc32                  hw_prev;        /* qh or EHCI_LIST_END */
 531
 532         /* the rest is HCD-private */
 533         dma_addr_t              fstn_dma;
 534         union ehci_shadow       fstn_next;      /* ptr to periodic q entry */
 535 } __attribute__ ((aligned (32)));
 536
 537 /*-------------------------------------------------------------------------*/
 538
 539 #ifdef CONFIG_USB_EHCI_ROOT_HUB_TT
 540
 541 /*
 542  * Some EHCI controllers have a Transaction Translator built into the
 543  * root hub. This is a non-standard feature.  Each controller will need
 544  * to add code to the following inline functions, and call them as
 545  * needed (mostly in root hub code).
 546  */
 547
 548 #define ehci_is_TDI(e)                  (ehci_to_hcd(e)->has_tt)
 549
 550 /* Returns the speed of a device attached to a port on the root hub. */
 551 static inline unsigned int
 552 ehci_port_speed(struct ehci_hcd *ehci, unsigned int portsc)
 553 {
 554         if (ehci_is_TDI(ehci)) {
 555                 switch ((portsc >> (ehci->has_hostpc ? 25 : 26)) & 3) {
 556                 case 0:
 557                         return 0;
 558                 case 1:
 559                         return (1<<USB_PORT_FEAT_LOWSPEED);
 560                 case 2:
 561                 default:
 562                         return (1<<USB_PORT_FEAT_HIGHSPEED);
 563                 }
 564         }
 565         return (1<<USB_PORT_FEAT_HIGHSPEED);
 566 }
 567
 568 #else
 569
 570 #define ehci_is_TDI(e)                  (0)
 571
 572 #define ehci_port_speed(ehci, portsc)   (1<<USB_PORT_FEAT_HIGHSPEED)
 573 #endif
 574
 575 /*-------------------------------------------------------------------------*/
 576
 577 #ifdef CONFIG_PPC_83xx
 578 /* Some Freescale processors have an erratum in which the TT
 579  * port number in the queue head was 0..N-1 instead of 1..N.
 580  */
 581 #define ehci_has_fsl_portno_bug(e)              ((e)->has_fsl_port_bug)
 582 #else
 583 #define ehci_has_fsl_portno_bug(e)              (0)
 584 #endif
 585
 586 /*
 587  * While most USB host controllers implement their registers in
 588  * little-endian format, a minority (celleb companion chip) implement
 589  * them in big endian format.
 590  *
 591  * This attempts to support either format at compile time without a
 592  * runtime penalty, or both formats with the additional overhead
 593  * of checking a flag bit.
 594  */
 595
 596 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 597 #define ehci_big_endian_mmio(e)         ((e)->big_endian_mmio)
 598 #else
 599 #define ehci_big_endian_mmio(e)         0
 600 #endif
 601
 602 /*
 603  * Big-endian read/write functions are arch-specific.
 604  * Other arches can be added if/when they're needed.
 605  */
 606 #if defined(CONFIG_ARM) && defined(CONFIG_ARCH_IXP4XX)
 607 #define readl_be(addr)          __raw_readl((__force unsigned *)addr)
 608 #define writel_be(val, addr)    __raw_writel(val, (__force unsigned *)addr)
 609 #endif
 610
 611 static inline unsigned int ehci_readl(const struct ehci_hcd *ehci,
 612                 __u32 __iomem * regs)
 613 {
 614 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 615         return ehci_big_endian_mmio(ehci) ?
 616                 readl_be(regs) :
 617                 readl(regs);
 618 #else
 619         return readl(regs);
 620 #endif
 621 }
 622
 623 static inline void ehci_writel(const struct ehci_hcd *ehci,
 624                 const unsigned int val, __u32 __iomem *regs)
 625 {
 626 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 627         ehci_big_endian_mmio(ehci) ?
 628                 writel_be(val, regs) :
 629                 writel(val, regs);
 630 #else
 631         writel(val, regs);
 632 #endif
 633 }
 634
 635 /*
 636  * On certain ppc-44x SoC there is a HW issue, that could only worked around with
 637  * explicit suspend/operate of OHCI. This function hereby makes sense only on that arch.
 638  * Other common bits are dependant on has_amcc_usb23 quirk flag.
 639  */
 640 #ifdef CONFIG_44x
 641 static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
 642 {
 643         u32 hc_control;
 644
 645         hc_control = (readl_be(ehci->ohci_hcctrl_reg) & ~OHCI_CTRL_HCFS);
 646         if (operational)
 647                 hc_control |= OHCI_USB_OPER;
 648         else
 649                 hc_control |= OHCI_USB_SUSPEND;
 650
 651         writel_be(hc_control, ehci->ohci_hcctrl_reg);
 652         (void) readl_be(ehci->ohci_hcctrl_reg);
 653 }
 654 #else
 655 static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
 656 { }
 657 #endif
 658
 659 /*-------------------------------------------------------------------------*/
 660
 661 /*
 662  * The AMCC 440EPx not only implements its EHCI registers in big-endian
 663  * format, but also its DMA data structures (descriptors).
 664  *
 665  * EHCI controllers accessed through PCI work normally (little-endian
 666  * everywhere), so we won't bother supporting a BE-only mode for now.
 667  */
 668 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
 669 #define ehci_big_endian_desc(e)         ((e)->big_endian_desc)
 670
 671 /* cpu to ehci */
 672 static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x)
 673 {
 674         return ehci_big_endian_desc(ehci)
 675                 ? (__force __hc32)cpu_to_be32(x)
 676                 : (__force __hc32)cpu_to_le32(x);
 677 }
 678
 679 /* ehci to cpu */
 680 static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x)
 681 {
 682         return ehci_big_endian_desc(ehci)
 683                 ? be32_to_cpu((__force __be32)x)
 684                 : le32_to_cpu((__force __le32)x);
 685 }
 686
 687 static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
 688 {
 689         return ehci_big_endian_desc(ehci)
 690                 ? be32_to_cpup((__force __be32 *)x)
 691                 : le32_to_cpup((__force __le32 *)x);
 692 }
 693
 694 #else
 695
 696 /* cpu to ehci */
 697 static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x)
 698 {
 699         return cpu_to_le32(x);
 700 }
 701
 702 /* ehci to cpu */
 703 static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x)
 704 {
 705         return le32_to_cpu(x);
 706 }
 707
 708 static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
 709 {
 710         return le32_to_cpup(x);
 711 }
 712
 713 #endif
 714
 715 /*-------------------------------------------------------------------------*/
 716
 717 #ifndef DEBUG
 718 #define STUB_DEBUG_FILES
 719 #endif  /* DEBUG */
 720
 721 /*-------------------------------------------------------------------------*/
 722
 723 #endif /* __LINUX_EHCI_HCD_H */