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          *dummy;         /* For AMD quirk use */
  77         struct ehci_qh          *reclaim;
  78         struct ehci_qh          *qh_scan_next;
  79         unsigned                scanning : 1;
  80
  81         /* periodic schedule support */
  82 #define DEFAULT_I_TDPS          1024            /* some HCs can do less */
  83         unsigned                periodic_size;
  84         __hc32                  *periodic;      /* hw periodic table */
  85         dma_addr_t              periodic_dma;
  86         unsigned                i_thresh;       /* uframes HC might cache */
  87
  88         union ehci_shadow       *pshadow;       /* mirror hw periodic table */
  89         int                     next_uframe;    /* scan periodic, start here */
  90         unsigned                periodic_sched; /* periodic activity count */
  91         unsigned                uframe_periodic_max; /* max periodic time per uframe */
  92
  93
  94         /* list of itds & sitds completed while clock_frame was still active */
  95         struct list_head        cached_itd_list;
  96         struct list_head        cached_sitd_list;
  97         unsigned                clock_frame;
  98
  99         /* per root hub port */
 100         unsigned long           reset_done [EHCI_MAX_ROOT_PORTS];
 101
 102         /* bit vectors (one bit per port) */
 103         unsigned long           bus_suspended;          /* which ports were
 104                         already suspended at the start of a bus suspend */
 105         unsigned long           companion_ports;        /* which ports are
 106                         dedicated to the companion controller */
 107         unsigned long           owned_ports;            /* which ports are
 108                         owned by the companion during a bus suspend */
 109         unsigned long           port_c_suspend;         /* which ports have
 110                         the change-suspend feature turned on */
 111         unsigned long           suspended_ports;        /* which ports are
 112                         suspended */
 113
 114         /* per-HC memory pools (could be per-bus, but ...) */
 115         struct dma_pool         *qh_pool;       /* qh per active urb */
 116         struct dma_pool         *qtd_pool;      /* one or more per qh */
 117         struct dma_pool         *itd_pool;      /* itd per iso urb */
 118         struct dma_pool         *sitd_pool;     /* sitd per split iso urb */
 119
 120         struct timer_list       iaa_watchdog;
 121         struct timer_list       watchdog;
 122         unsigned long           actions;
 123         unsigned                periodic_stamp;
 124         unsigned                random_frame;
 125         unsigned long           next_statechange;
 126         ktime_t                 last_periodic_enable;
 127         u32                     command;
 128
 129         /* SILICON QUIRKS */
 130         unsigned                no_selective_suspend:1;
 131         unsigned                has_fsl_port_bug:1; /* FreeScale */
 132         unsigned                big_endian_mmio:1;
 133         unsigned                big_endian_desc:1;
 134         unsigned                big_endian_capbase:1;
 135         unsigned                has_amcc_usb23:1;
 136         unsigned                need_io_watchdog:1;
 137         unsigned                broken_periodic:1;
 138         unsigned                amd_pll_fix:1;
 139         unsigned                fs_i_thresh:1;  /* Intel iso scheduling */
 140         unsigned                use_dummy_qh:1; /* AMD Frame List table quirk*/
 141         unsigned                has_synopsys_hc_bug:1; /* Synopsys HC */
 142
 143         /* required for usb32 quirk */
 144         #define OHCI_CTRL_HCFS          (3 << 6)
 145         #define OHCI_USB_OPER           (2 << 6)
 146         #define OHCI_USB_SUSPEND        (3 << 6)
 147
 148         #define OHCI_HCCTRL_OFFSET      0x4
 149         #define OHCI_HCCTRL_LEN         0x4
 150         __hc32                  *ohci_hcctrl_reg;
 151         unsigned                has_hostpc:1;
 152         unsigned                has_lpm:1;  /* support link power management */
 153         unsigned                has_ppcd:1; /* support per-port change bits */
 154         u8                      sbrn;           /* packed release number */
 155
 156         /* irq statistics */
 157 #ifdef EHCI_STATS
 158         struct ehci_stats       stats;
 159 #       define COUNT(x) do { (x)++; } while (0)
 160 #else
 161 #       define COUNT(x) do {} while (0)
 162 #endif
 163
 164         /* debug files */
 165 #ifdef DEBUG
 166         struct dentry           *debug_dir;
 167 #endif
 168         /*
 169          * OTG controllers and transceivers need software interaction
 170          */
 171         struct otg_transceiver  *transceiver;
 172 };
 173
 174 /* convert between an HCD pointer and the corresponding EHCI_HCD */
 175 static inline struct ehci_hcd *hcd_to_ehci (struct usb_hcd *hcd)
 176 {
 177         return (struct ehci_hcd *) (hcd->hcd_priv);
 178 }
 179 static inline struct usb_hcd *ehci_to_hcd (struct ehci_hcd *ehci)
 180 {
 181         return container_of ((void *) ehci, struct usb_hcd, hcd_priv);
 182 }
 183
 184
 185 static inline void
 186 iaa_watchdog_start(struct ehci_hcd *ehci)
 187 {
 188         WARN_ON(timer_pending(&ehci->iaa_watchdog));
 189         mod_timer(&ehci->iaa_watchdog,
 190                         jiffies + msecs_to_jiffies(EHCI_IAA_MSECS));
 191 }
 192
 193 static inline void iaa_watchdog_done(struct ehci_hcd *ehci)
 194 {
 195         del_timer(&ehci->iaa_watchdog);
 196 }
 197
 198 enum ehci_timer_action {
 199         TIMER_IO_WATCHDOG,
 200         TIMER_ASYNC_SHRINK,
 201         TIMER_ASYNC_OFF,
 202 };
 203
 204 static inline void
 205 timer_action_done (struct ehci_hcd *ehci, enum ehci_timer_action action)
 206 {
 207         clear_bit (action, &ehci->actions);
 208 }
 209
 210 static void free_cached_lists(struct ehci_hcd *ehci);
 211
 212 /*-------------------------------------------------------------------------*/
 213
 214 #include <linux/usb/ehci_def.h>
 215
 216 /*-------------------------------------------------------------------------*/
 217
 218 #define QTD_NEXT(ehci, dma)     cpu_to_hc32(ehci, (u32)dma)
 219
 220 /*
 221  * EHCI Specification 0.95 Section 3.5
 222  * QTD: describe data transfer components (buffer, direction, ...)
 223  * See Fig 3-6 "Queue Element Transfer Descriptor Block Diagram".
 224  *
 225  * These are associated only with "QH" (Queue Head) structures,
 226  * used with control, bulk, and interrupt transfers.
 227  */
 228 struct ehci_qtd {
 229         /* first part defined by EHCI spec */
 230         __hc32                  hw_next;        /* see EHCI 3.5.1 */
 231         __hc32                  hw_alt_next;    /* see EHCI 3.5.2 */
 232         __hc32                  hw_token;       /* see EHCI 3.5.3 */
 233 #define QTD_TOGGLE      (1 << 31)       /* data toggle */
 234 #define QTD_LENGTH(tok) (((tok)>>16) & 0x7fff)
 235 #define QTD_IOC         (1 << 15)       /* interrupt on complete */
 236 #define QTD_CERR(tok)   (((tok)>>10) & 0x3)
 237 #define QTD_PID(tok)    (((tok)>>8) & 0x3)
 238 #define QTD_STS_ACTIVE  (1 << 7)        /* HC may execute this */
 239 #define QTD_STS_HALT    (1 << 6)        /* halted on error */
 240 #define QTD_STS_DBE     (1 << 5)        /* data buffer error (in HC) */
 241 #define QTD_STS_BABBLE  (1 << 4)        /* device was babbling (qtd halted) */
 242 #define QTD_STS_XACT    (1 << 3)        /* device gave illegal response */
 243 #define QTD_STS_MMF     (1 << 2)        /* incomplete split transaction */
 244 #define QTD_STS_STS     (1 << 1)        /* split transaction state */
 245 #define QTD_STS_PING    (1 << 0)        /* issue PING? */
 246
 247 #define ACTIVE_BIT(ehci)        cpu_to_hc32(ehci, QTD_STS_ACTIVE)
 248 #define HALT_BIT(ehci)          cpu_to_hc32(ehci, QTD_STS_HALT)
 249 #define STATUS_BIT(ehci)        cpu_to_hc32(ehci, QTD_STS_STS)
 250
 251         __hc32                  hw_buf [5];        /* see EHCI 3.5.4 */
 252         __hc32                  hw_buf_hi [5];        /* Appendix B */
 253
 254         /* the rest is HCD-private */
 255         dma_addr_t              qtd_dma;                /* qtd address */
 256         struct list_head        qtd_list;               /* sw qtd list */
 257         struct urb              *urb;                   /* qtd's urb */
 258         size_t                  length;                 /* length of buffer */
 259 } __attribute__ ((aligned (32)));
 260
 261 /* mask NakCnt+T in qh->hw_alt_next */
 262 #define QTD_MASK(ehci)  cpu_to_hc32 (ehci, ~0x1f)
 263
 264 #define IS_SHORT_READ(token) (QTD_LENGTH (token) != 0 && QTD_PID (token) == 1)
 265
 266 /*-------------------------------------------------------------------------*/
 267
 268 /* type tag from {qh,itd,sitd,fstn}->hw_next */
 269 #define Q_NEXT_TYPE(ehci,dma)   ((dma) & cpu_to_hc32(ehci, 3 << 1))
 270
 271 /*
 272  * Now the following defines are not converted using the
 273  * cpu_to_le32() macro anymore, since we have to support
 274  * "dynamic" switching between be and le support, so that the driver
 275  * can be used on one system with SoC EHCI controller using big-endian
 276  * descriptors as well as a normal little-endian PCI EHCI controller.
 277  */
 278 /* values for that type tag */
 279 #define Q_TYPE_ITD      (0 << 1)
 280 #define Q_TYPE_QH       (1 << 1)
 281 #define Q_TYPE_SITD     (2 << 1)
 282 #define Q_TYPE_FSTN     (3 << 1)
 283
 284 /* next async queue entry, or pointer to interrupt/periodic QH */
 285 #define QH_NEXT(ehci,dma)       (cpu_to_hc32(ehci, (((u32)dma)&~0x01f)|Q_TYPE_QH))
 286
 287 /* for periodic/async schedules and qtd lists, mark end of list */
 288 #define EHCI_LIST_END(ehci)     cpu_to_hc32(ehci, 1) /* "null pointer" to hw */
 289
 290 /*
 291  * Entries in periodic shadow table are pointers to one of four kinds
 292  * of data structure.  That's dictated by the hardware; a type tag is
 293  * encoded in the low bits of the hardware's periodic schedule.  Use
 294  * Q_NEXT_TYPE to get the tag.
 295  *
 296  * For entries in the async schedule, the type tag always says "qh".
 297  */
 298 union ehci_shadow {
 299         struct ehci_qh          *qh;            /* Q_TYPE_QH */
 300         struct ehci_itd         *itd;           /* Q_TYPE_ITD */
 301         struct ehci_sitd        *sitd;          /* Q_TYPE_SITD */
 302         struct ehci_fstn        *fstn;          /* Q_TYPE_FSTN */
 303         __hc32                  *hw_next;       /* (all types) */
 304         void                    *ptr;
 305 };
 306
 307 /*-------------------------------------------------------------------------*/
 308
 309 /*
 310  * EHCI Specification 0.95 Section 3.6
 311  * QH: describes control/bulk/interrupt endpoints
 312  * See Fig 3-7 "Queue Head Structure Layout".
 313  *
 314  * These appear in both the async and (for interrupt) periodic schedules.
 315  */
 316
 317 /* first part defined by EHCI spec */
 318 struct ehci_qh_hw {
 319         __hc32                  hw_next;        /* see EHCI 3.6.1 */
 320         __hc32                  hw_info1;       /* see EHCI 3.6.2 */
 321 #define QH_HEAD         0x00008000
 322         __hc32                  hw_info2;        /* see EHCI 3.6.2 */
 323 #define QH_SMASK        0x000000ff
 324 #define QH_CMASK        0x0000ff00
 325 #define QH_HUBADDR      0x007f0000
 326 #define QH_HUBPORT      0x3f800000
 327 #define QH_MULT         0xc0000000
 328         __hc32                  hw_current;     /* qtd list - see EHCI 3.6.4 */
 329
 330         /* qtd overlay (hardware parts of a struct ehci_qtd) */
 331         __hc32                  hw_qtd_next;
 332         __hc32                  hw_alt_next;
 333         __hc32                  hw_token;
 334         __hc32                  hw_buf [5];
 335         __hc32                  hw_buf_hi [5];
 336 } __attribute__ ((aligned(32)));
 337
 338 struct ehci_qh {
 339         struct ehci_qh_hw       *hw;
 340         /* the rest is HCD-private */
 341         dma_addr_t              qh_dma;         /* address of qh */
 342         union ehci_shadow       qh_next;        /* ptr to qh; or periodic */
 343         struct list_head        qtd_list;       /* sw qtd list */
 344         struct ehci_qtd         *dummy;
 345         struct ehci_qh          *reclaim;       /* next to reclaim */
 346
 347         struct ehci_hcd         *ehci;
 348         unsigned long           unlink_time;
 349
 350         /*
 351          * Do NOT use atomic operations for QH refcounting. On some CPUs
 352          * (PPC7448 for example), atomic operations cannot be performed on
 353          * memory that is cache-inhibited (i.e. being used for DMA).
 354          * Spinlocks are used to protect all QH fields.
 355          */
 356         u32                     refcount;
 357         unsigned                stamp;
 358
 359         u8                      needs_rescan;   /* Dequeue during giveback */
 360         u8                      qh_state;
 361 #define QH_STATE_LINKED         1               /* HC sees this */
 362 #define QH_STATE_UNLINK         2               /* HC may still see this */
 363 #define QH_STATE_IDLE           3               /* HC doesn't see this */
 364 #define QH_STATE_UNLINK_WAIT    4               /* LINKED and on reclaim q */
 365 #define QH_STATE_COMPLETING     5               /* don't touch token.HALT */
 366
 367         u8                      xacterrs;       /* XactErr retry counter */
 368 #define QH_XACTERR_MAX          32              /* XactErr retry limit */
 369
 370         /* periodic schedule info */
 371         u8                      usecs;          /* intr bandwidth */
 372         u8                      gap_uf;         /* uframes split/csplit gap */
 373         u8                      c_usecs;        /* ... split completion bw */
 374         u16                     tt_usecs;       /* tt downstream bandwidth */
 375         unsigned short          period;         /* polling interval */
 376         unsigned short          start;          /* where polling starts */
 377 #define NO_FRAME ((unsigned short)~0)                   /* pick new start */
 378
 379         struct usb_device       *dev;           /* access to TT */
 380         unsigned                clearing_tt:1;  /* Clear-TT-Buf in progress */
 381 };
 382
 383 /*-------------------------------------------------------------------------*/
 384
 385 /* description of one iso transaction (up to 3 KB data if highspeed) */
 386 struct ehci_iso_packet {
 387         /* These will be copied to iTD when scheduling */
 388         u64                     bufp;           /* itd->hw_bufp{,_hi}[pg] |= */
 389         __hc32                  transaction;    /* itd->hw_transaction[i] |= */
 390         u8                      cross;          /* buf crosses pages */
 391         /* for full speed OUT splits */
 392         u32                     buf1;
 393 };
 394
 395 /* temporary schedule data for packets from iso urbs (both speeds)
 396  * each packet is one logical usb transaction to the device (not TT),
 397  * beginning at stream->next_uframe
 398  */
 399 struct ehci_iso_sched {
 400         struct list_head        td_list;
 401         unsigned                span;
 402         struct ehci_iso_packet  packet [0];
 403 };
 404
 405 /*
 406  * ehci_iso_stream - groups all (s)itds for this endpoint.
 407  * acts like a qh would, if EHCI had them for ISO.
 408  */
 409 struct ehci_iso_stream {
 410         /* first field matches ehci_hq, but is NULL */
 411         struct ehci_qh_hw       *hw;
 412
 413         u32                     refcount;
 414         u8                      bEndpointAddress;
 415         u8                      highspeed;
 416         struct list_head        td_list;        /* queued itds/sitds */
 417         struct list_head        free_list;      /* list of unused itds/sitds */
 418         struct usb_device       *udev;
 419         struct usb_host_endpoint *ep;
 420
 421         /* output of (re)scheduling */
 422         int                     next_uframe;
 423         __hc32                  splits;
 424
 425         /* the rest is derived from the endpoint descriptor,
 426          * trusting urb->interval == f(epdesc->bInterval) and
 427          * including the extra info for hw_bufp[0..2]
 428          */
 429         u8                      usecs, c_usecs;
 430         u16                     interval;
 431         u16                     tt_usecs;
 432         u16                     maxp;
 433         u16                     raw_mask;
 434         unsigned                bandwidth;
 435
 436         /* This is used to initialize iTD's hw_bufp fields */
 437         __hc32                  buf0;
 438         __hc32                  buf1;
 439         __hc32                  buf2;
 440
 441         /* this is used to initialize sITD's tt info */
 442         __hc32                  address;
 443 };
 444
 445 /*-------------------------------------------------------------------------*/
 446
 447 /*
 448  * EHCI Specification 0.95 Section 3.3
 449  * Fig 3-4 "Isochronous Transaction Descriptor (iTD)"
 450  *
 451  * Schedule records for high speed iso xfers
 452  */
 453 struct ehci_itd {
 454         /* first part defined by EHCI spec */
 455         __hc32                  hw_next;           /* see EHCI 3.3.1 */
 456         __hc32                  hw_transaction [8]; /* see EHCI 3.3.2 */
 457 #define EHCI_ISOC_ACTIVE        (1<<31)        /* activate transfer this slot */
 458 #define EHCI_ISOC_BUF_ERR       (1<<30)        /* Data buffer error */
 459 #define EHCI_ISOC_BABBLE        (1<<29)        /* babble detected */
 460 #define EHCI_ISOC_XACTERR       (1<<28)        /* XactErr - transaction error */
 461 #define EHCI_ITD_LENGTH(tok)    (((tok)>>16) & 0x0fff)
 462 #define EHCI_ITD_IOC            (1 << 15)       /* interrupt on complete */
 463
 464 #define ITD_ACTIVE(ehci)        cpu_to_hc32(ehci, EHCI_ISOC_ACTIVE)
 465
 466         __hc32                  hw_bufp [7];    /* see EHCI 3.3.3 */
 467         __hc32                  hw_bufp_hi [7]; /* Appendix B */
 468
 469         /* the rest is HCD-private */
 470         dma_addr_t              itd_dma;        /* for this itd */
 471         union ehci_shadow       itd_next;       /* ptr to periodic q entry */
 472
 473         struct urb              *urb;
 474         struct ehci_iso_stream  *stream;        /* endpoint's queue */
 475         struct list_head        itd_list;       /* list of stream's itds */
 476
 477         /* any/all hw_transactions here may be used by that urb */
 478         unsigned                frame;          /* where scheduled */
 479         unsigned                pg;
 480         unsigned                index[8];       /* in urb->iso_frame_desc */
 481 } __attribute__ ((aligned (32)));
 482
 483 /*-------------------------------------------------------------------------*/
 484
 485 /*
 486  * EHCI Specification 0.95 Section 3.4
 487  * siTD, aka split-transaction isochronous Transfer Descriptor
 488  *       ... describe full speed iso xfers through TT in hubs
 489  * see Figure 3-5 "Split-transaction Isochronous Transaction Descriptor (siTD)
 490  */
 491 struct ehci_sitd {
 492         /* first part defined by EHCI spec */
 493         __hc32                  hw_next;
 494 /* uses bit field macros above - see EHCI 0.95 Table 3-8 */
 495         __hc32                  hw_fullspeed_ep;        /* EHCI table 3-9 */
 496         __hc32                  hw_uframe;              /* EHCI table 3-10 */
 497         __hc32                  hw_results;             /* EHCI table 3-11 */
 498 #define SITD_IOC        (1 << 31)       /* interrupt on completion */
 499 #define SITD_PAGE       (1 << 30)       /* buffer 0/1 */
 500 #define SITD_LENGTH(x)  (0x3ff & ((x)>>16))
 501 #define SITD_STS_ACTIVE (1 << 7)        /* HC may execute this */
 502 #define SITD_STS_ERR    (1 << 6)        /* error from TT */
 503 #define SITD_STS_DBE    (1 << 5)        /* data buffer error (in HC) */
 504 #define SITD_STS_BABBLE (1 << 4)        /* device was babbling */
 505 #define SITD_STS_XACT   (1 << 3)        /* illegal IN response */
 506 #define SITD_STS_MMF    (1 << 2)        /* incomplete split transaction */
 507 #define SITD_STS_STS    (1 << 1)        /* split transaction state */
 508
 509 #define SITD_ACTIVE(ehci)       cpu_to_hc32(ehci, SITD_STS_ACTIVE)
 510
 511         __hc32                  hw_buf [2];             /* EHCI table 3-12 */
 512         __hc32                  hw_backpointer;         /* EHCI table 3-13 */
 513         __hc32                  hw_buf_hi [2];          /* Appendix B */
 514
 515         /* the rest is HCD-private */
 516         dma_addr_t              sitd_dma;
 517         union ehci_shadow       sitd_next;      /* ptr to periodic q entry */
 518
 519         struct urb              *urb;
 520         struct ehci_iso_stream  *stream;        /* endpoint's queue */
 521         struct list_head        sitd_list;      /* list of stream's sitds */
 522         unsigned                frame;
 523         unsigned                index;
 524 } __attribute__ ((aligned (32)));
 525
 526 /*-------------------------------------------------------------------------*/
 527
 528 /*
 529  * EHCI Specification 0.96 Section 3.7
 530  * Periodic Frame Span Traversal Node (FSTN)
 531  *
 532  * Manages split interrupt transactions (using TT) that span frame boundaries
 533  * into uframes 0/1; see 4.12.2.2.  In those uframes, a "save place" FSTN
 534  * makes the HC jump (back) to a QH to scan for fs/ls QH completions until
 535  * it hits a "restore" FSTN; then it returns to finish other uframe 0/1 work.
 536  */
 537 struct ehci_fstn {
 538         __hc32                  hw_next;        /* any periodic q entry */
 539         __hc32                  hw_prev;        /* qh or EHCI_LIST_END */
 540
 541         /* the rest is HCD-private */
 542         dma_addr_t              fstn_dma;
 543         union ehci_shadow       fstn_next;      /* ptr to periodic q entry */
 544 } __attribute__ ((aligned (32)));
 545
 546 /*-------------------------------------------------------------------------*/
 547
 548 /* Prepare the PORTSC wakeup flags during controller suspend/resume */
 549
 550 #define ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup)      \
 551                 ehci_adjust_port_wakeup_flags(ehci, true, do_wakeup);
 552
 553 #define ehci_prepare_ports_for_controller_resume(ehci)                  \
 554                 ehci_adjust_port_wakeup_flags(ehci, false, false);
 555
 556 /*-------------------------------------------------------------------------*/
 557
 558 #ifdef CONFIG_USB_EHCI_ROOT_HUB_TT
 559
 560 /*
 561  * Some EHCI controllers have a Transaction Translator built into the
 562  * root hub. This is a non-standard feature.  Each controller will need
 563  * to add code to the following inline functions, and call them as
 564  * needed (mostly in root hub code).
 565  */
 566
 567 #define ehci_is_TDI(e)                  (ehci_to_hcd(e)->has_tt)
 568
 569 /* Returns the speed of a device attached to a port on the root hub. */
 570 static inline unsigned int
 571 ehci_port_speed(struct ehci_hcd *ehci, unsigned int portsc)
 572 {
 573         if (ehci_is_TDI(ehci)) {
 574                 switch ((portsc >> (ehci->has_hostpc ? 25 : 26)) & 3) {
 575                 case 0:
 576                         return 0;
 577                 case 1:
 578                         return USB_PORT_STAT_LOW_SPEED;
 579                 case 2:
 580                 default:
 581                         return USB_PORT_STAT_HIGH_SPEED;
 582                 }
 583         }
 584         return USB_PORT_STAT_HIGH_SPEED;
 585 }
 586
 587 #else
 588
 589 #define ehci_is_TDI(e)                  (0)
 590
 591 #define ehci_port_speed(ehci, portsc)   USB_PORT_STAT_HIGH_SPEED
 592 #endif
 593
 594 /*-------------------------------------------------------------------------*/
 595
 596 #ifdef CONFIG_PPC_83xx
 597 /* Some Freescale processors have an erratum in which the TT
 598  * port number in the queue head was 0..N-1 instead of 1..N.
 599  */
 600 #define ehci_has_fsl_portno_bug(e)              ((e)->has_fsl_port_bug)
 601 #else
 602 #define ehci_has_fsl_portno_bug(e)              (0)
 603 #endif
 604
 605 /*
 606  * While most USB host controllers implement their registers in
 607  * little-endian format, a minority (celleb companion chip) implement
 608  * them in big endian format.
 609  *
 610  * This attempts to support either format at compile time without a
 611  * runtime penalty, or both formats with the additional overhead
 612  * of checking a flag bit.
 613  *
 614  * ehci_big_endian_capbase is a special quirk for controllers that
 615  * implement the HC capability registers as separate registers and not
 616  * as fields of a 32-bit register.
 617  */
 618
 619 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 620 #define ehci_big_endian_mmio(e)         ((e)->big_endian_mmio)
 621 #define ehci_big_endian_capbase(e)      ((e)->big_endian_capbase)
 622 #else
 623 #define ehci_big_endian_mmio(e)         0
 624 #define ehci_big_endian_capbase(e)      0
 625 #endif
 626
 627 /*
 628  * Big-endian read/write functions are arch-specific.
 629  * Other arches can be added if/when they're needed.
 630  */
 631 #if defined(CONFIG_ARM) && defined(CONFIG_ARCH_IXP4XX)
 632 #define readl_be(addr)          __raw_readl((__force unsigned *)addr)
 633 #define writel_be(val, addr)    __raw_writel(val, (__force unsigned *)addr)
 634 #endif
 635
 636 static inline unsigned int ehci_readl(const struct ehci_hcd *ehci,
 637                 __u32 __iomem * regs)
 638 {
 639 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 640         return ehci_big_endian_mmio(ehci) ?
 641                 readl_be(regs) :
 642                 readl(regs);
 643 #else
 644         return readl(regs);
 645 #endif
 646 }
 647
 648 static inline void ehci_writel(const struct ehci_hcd *ehci,
 649                 const unsigned int val, __u32 __iomem *regs)
 650 {
 651 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 652         ehci_big_endian_mmio(ehci) ?
 653                 writel_be(val, regs) :
 654                 writel(val, regs);
 655 #else
 656         writel(val, regs);
 657 #endif
 658 }
 659
 660 /*
 661  * On certain ppc-44x SoC there is a HW issue, that could only worked around with
 662  * explicit suspend/operate of OHCI. This function hereby makes sense only on that arch.
 663  * Other common bits are dependent on has_amcc_usb23 quirk flag.
 664  */
 665 #ifdef CONFIG_44x
 666 static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
 667 {
 668         u32 hc_control;
 669
 670         hc_control = (readl_be(ehci->ohci_hcctrl_reg) & ~OHCI_CTRL_HCFS);
 671         if (operational)
 672                 hc_control |= OHCI_USB_OPER;
 673         else
 674                 hc_control |= OHCI_USB_SUSPEND;
 675
 676         writel_be(hc_control, ehci->ohci_hcctrl_reg);
 677         (void) readl_be(ehci->ohci_hcctrl_reg);
 678 }
 679 #else
 680 static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
 681 { }
 682 #endif
 683
 684 /*-------------------------------------------------------------------------*/
 685
 686 /*
 687  * The AMCC 440EPx not only implements its EHCI registers in big-endian
 688  * format, but also its DMA data structures (descriptors).
 689  *
 690  * EHCI controllers accessed through PCI work normally (little-endian
 691  * everywhere), so we won't bother supporting a BE-only mode for now.
 692  */
 693 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
 694 #define ehci_big_endian_desc(e)         ((e)->big_endian_desc)
 695
 696 /* cpu to ehci */
 697 static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x)
 698 {
 699         return ehci_big_endian_desc(ehci)
 700                 ? (__force __hc32)cpu_to_be32(x)
 701                 : (__force __hc32)cpu_to_le32(x);
 702 }
 703
 704 /* ehci to cpu */
 705 static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x)
 706 {
 707         return ehci_big_endian_desc(ehci)
 708                 ? be32_to_cpu((__force __be32)x)
 709                 : le32_to_cpu((__force __le32)x);
 710 }
 711
 712 static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
 713 {
 714         return ehci_big_endian_desc(ehci)
 715                 ? be32_to_cpup((__force __be32 *)x)
 716                 : le32_to_cpup((__force __le32 *)x);
 717 }
 718
 719 #else
 720
 721 /* cpu to ehci */
 722 static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x)
 723 {
 724         return cpu_to_le32(x);
 725 }
 726
 727 /* ehci to cpu */
 728 static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x)
 729 {
 730         return le32_to_cpu(x);
 731 }
 732
 733 static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
 734 {
 735         return le32_to_cpup(x);
 736 }
 737
 738 #endif
 739
 740 /*-------------------------------------------------------------------------*/
 741
 742 #ifndef DEBUG
 743 #define STUB_DEBUG_FILES
 744 #endif  /* DEBUG */
 745
 746 /*-------------------------------------------------------------------------*/
 747
 748 #endif /* __LINUX_EHCI_HCD_H */