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 #ifdef CONFIG_DYNAMIC_DEBUG
  42 #define EHCI_STATS
  43 #endif
  44
  45 struct ehci_stats {
  46         /* irq usage */
  47         unsigned long           normal;
  48         unsigned long           error;
  49         unsigned long           iaa;
  50         unsigned long           lost_iaa;
  51
  52         /* termination of urbs from core */
  53         unsigned long           complete;
  54         unsigned long           unlink;
  55 };
  56
  57 /*
  58  * Scheduling and budgeting information for periodic transfers, for both
  59  * high-speed devices and full/low-speed devices lying behind a TT.
  60  */
  61 struct ehci_per_sched {
  62         struct usb_device       *udev;          /* access to the TT */
  63         struct usb_host_endpoint *ep;
  64         struct list_head        ps_list;        /* node on ehci_tt's ps_list */
  65         u16                     tt_usecs;       /* time on the FS/LS bus */
  66         u16                     cs_mask;        /* C-mask and S-mask bytes */
  67         u16                     period;         /* actual period in frames */
  68         u16                     phase;          /* actual phase, frame part */
  69         u8                      bw_phase;       /* same, for bandwidth
  70                                                    reservation */
  71         u8                      phase_uf;       /* uframe part of the phase */
  72         u8                      usecs, c_usecs; /* times on the HS bus */
  73         u8                      bw_uperiod;     /* period in microframes, for
  74                                                    bandwidth reservation */
  75         u8                      bw_period;      /* same, in frames */
  76 };
  77 #define NO_FRAME        29999                   /* frame not assigned yet */
  78
  79 /* ehci_hcd->lock guards shared data against other CPUs:
  80  *   ehci_hcd:  async, unlink, periodic (and shadow), ...
  81  *   usb_host_endpoint: hcpriv
  82  *   ehci_qh:   qh_next, qtd_list
  83  *   ehci_qtd:  qtd_list
  84  *
  85  * Also, hold this lock when talking to HC registers or
  86  * when updating hw_* fields in shared qh/qtd/... structures.
  87  */
  88
  89 #define EHCI_MAX_ROOT_PORTS     15              /* see HCS_N_PORTS */
  90
  91 /*
  92  * ehci_rh_state values of EHCI_RH_RUNNING or above mean that the
  93  * controller may be doing DMA.  Lower values mean there's no DMA.
  94  */
  95 enum ehci_rh_state {
  96         EHCI_RH_HALTED,
  97         EHCI_RH_SUSPENDED,
  98         EHCI_RH_RUNNING,
  99         EHCI_RH_STOPPING
 100 };
 101
 102 /*
 103  * Timer events, ordered by increasing delay length.
 104  * Always update event_delays_ns[] and event_handlers[] (defined in
 105  * ehci-timer.c) in parallel with this list.
 106  */
 107 enum ehci_hrtimer_event {
 108         EHCI_HRTIMER_POLL_ASS,          /* Poll for async schedule off */
 109         EHCI_HRTIMER_POLL_PSS,          /* Poll for periodic schedule off */
 110         EHCI_HRTIMER_POLL_DEAD,         /* Wait for dead controller to stop */
 111         EHCI_HRTIMER_UNLINK_INTR,       /* Wait for interrupt QH unlink */
 112         EHCI_HRTIMER_FREE_ITDS,         /* Wait for unused iTDs and siTDs */
 113         EHCI_HRTIMER_START_UNLINK_INTR, /* Unlink empty interrupt QHs */
 114         EHCI_HRTIMER_ASYNC_UNLINKS,     /* Unlink empty async QHs */
 115         EHCI_HRTIMER_IAA_WATCHDOG,      /* Handle lost IAA interrupts */
 116         EHCI_HRTIMER_DISABLE_PERIODIC,  /* Wait to disable periodic sched */
 117         EHCI_HRTIMER_DISABLE_ASYNC,     /* Wait to disable async sched */
 118         EHCI_HRTIMER_IO_WATCHDOG,       /* Check for missing IRQs */
 119         EHCI_HRTIMER_NUM_EVENTS         /* Must come last */
 120 };
 121 #define EHCI_HRTIMER_NO_EVENT   99
 122
 123 struct ehci_hcd {                       /* one per controller */
 124         /* timing support */
 125         enum ehci_hrtimer_event next_hrtimer_event;
 126         unsigned                enabled_hrtimer_events;
 127         ktime_t                 hr_timeouts[EHCI_HRTIMER_NUM_EVENTS];
 128         struct hrtimer          hrtimer;
 129
 130         int                     PSS_poll_count;
 131         int                     ASS_poll_count;
 132         int                     died_poll_count;
 133
 134         /* glue to PCI and HCD framework */
 135         struct ehci_caps __iomem *caps;
 136         struct ehci_regs __iomem *regs;
 137         struct ehci_dbg_port __iomem *debug;
 138
 139         __u32                   hcs_params;     /* cached register copy */
 140         spinlock_t              lock;
 141         enum ehci_rh_state      rh_state;
 142
 143         /* general schedule support */
 144         bool                    scanning:1;
 145         bool                    need_rescan:1;
 146         bool                    intr_unlinking:1;
 147         bool                    iaa_in_progress:1;
 148         bool                    async_unlinking:1;
 149         bool                    shutdown:1;
 150         struct ehci_qh          *qh_scan_next;
 151
 152         /* async schedule support */
 153         struct ehci_qh          *async;
 154         struct ehci_qh          *dummy;         /* For AMD quirk use */
 155         struct list_head        async_unlink;
 156         struct list_head        async_idle;
 157         unsigned                async_unlink_cycle;
 158         unsigned                async_count;    /* async activity count */
 159
 160         /* periodic schedule support */
 161 #define DEFAULT_I_TDPS          1024            /* some HCs can do less */
 162         unsigned                periodic_size;
 163         __hc32                  *periodic;      /* hw periodic table */
 164         dma_addr_t              periodic_dma;
 165         struct list_head        intr_qh_list;
 166         unsigned                i_thresh;       /* uframes HC might cache */
 167
 168         union ehci_shadow       *pshadow;       /* mirror hw periodic table */
 169         struct list_head        intr_unlink_wait;
 170         struct list_head        intr_unlink;
 171         unsigned                intr_unlink_wait_cycle;
 172         unsigned                intr_unlink_cycle;
 173         unsigned                now_frame;      /* frame from HC hardware */
 174         unsigned                last_iso_frame; /* last frame scanned for iso */
 175         unsigned                intr_count;     /* intr activity count */
 176         unsigned                isoc_count;     /* isoc activity count */
 177         unsigned                periodic_count; /* periodic activity count */
 178         unsigned                uframe_periodic_max; /* max periodic time per uframe */
 179
 180
 181         /* list of itds & sitds completed while now_frame was still active */
 182         struct list_head        cached_itd_list;
 183         struct ehci_itd         *last_itd_to_free;
 184         struct list_head        cached_sitd_list;
 185         struct ehci_sitd        *last_sitd_to_free;
 186
 187         /* per root hub port */
 188         unsigned long           reset_done [EHCI_MAX_ROOT_PORTS];
 189
 190         /* bit vectors (one bit per port) */
 191         unsigned long           bus_suspended;          /* which ports were
 192                         already suspended at the start of a bus suspend */
 193         unsigned long           companion_ports;        /* which ports are
 194                         dedicated to the companion controller */
 195         unsigned long           owned_ports;            /* which ports are
 196                         owned by the companion during a bus suspend */
 197         unsigned long           port_c_suspend;         /* which ports have
 198                         the change-suspend feature turned on */
 199         unsigned long           suspended_ports;        /* which ports are
 200                         suspended */
 201         unsigned long           resuming_ports;         /* which ports have
 202                         started to resume */
 203
 204         /* per-HC memory pools (could be per-bus, but ...) */
 205         struct dma_pool         *qh_pool;       /* qh per active urb */
 206         struct dma_pool         *qtd_pool;      /* one or more per qh */
 207         struct dma_pool         *itd_pool;      /* itd per iso urb */
 208         struct dma_pool         *sitd_pool;     /* sitd per split iso urb */
 209
 210         unsigned                random_frame;
 211         unsigned long           next_statechange;
 212         ktime_t                 last_periodic_enable;
 213         u32                     command;
 214
 215         /* SILICON QUIRKS */
 216         unsigned                no_selective_suspend:1;
 217         unsigned                has_fsl_port_bug:1; /* FreeScale */
 218         unsigned                big_endian_mmio:1;
 219         unsigned                big_endian_desc:1;
 220         unsigned                big_endian_capbase:1;
 221         unsigned                has_amcc_usb23:1;
 222         unsigned                need_io_watchdog:1;
 223         unsigned                amd_pll_fix:1;
 224         unsigned                use_dummy_qh:1; /* AMD Frame List table quirk*/
 225         unsigned                has_synopsys_hc_bug:1; /* Synopsys HC */
 226         unsigned                frame_index_bug:1; /* MosChip (AKA NetMos) */
 227         unsigned                need_oc_pp_cycle:1; /* MPC834X port power */
 228         unsigned                imx28_write_fix:1; /* For Freescale i.MX28 */
 229
 230         /* required for usb32 quirk */
 231         #define OHCI_CTRL_HCFS          (3 << 6)
 232         #define OHCI_USB_OPER           (2 << 6)
 233         #define OHCI_USB_SUSPEND        (3 << 6)
 234
 235         #define OHCI_HCCTRL_OFFSET      0x4
 236         #define OHCI_HCCTRL_LEN         0x4
 237         __hc32                  *ohci_hcctrl_reg;
 238         unsigned                has_hostpc:1;
 239         unsigned                has_tdi_phy_lpm:1;
 240         unsigned                has_ppcd:1; /* support per-port change bits */
 241         u8                      sbrn;           /* packed release number */
 242
 243         /* irq statistics */
 244 #ifdef EHCI_STATS
 245         struct ehci_stats       stats;
 246 #       define COUNT(x) do { (x)++; } while (0)
 247 #else
 248 #       define COUNT(x) do {} while (0)
 249 #endif
 250
 251         /* debug files */
 252 #ifdef CONFIG_DYNAMIC_DEBUG
 253         struct dentry           *debug_dir;
 254 #endif
 255
 256         /* bandwidth usage */
 257 #define EHCI_BANDWIDTH_SIZE     64
 258 #define EHCI_BANDWIDTH_FRAMES   (EHCI_BANDWIDTH_SIZE >> 3)
 259         u8                      bandwidth[EHCI_BANDWIDTH_SIZE];
 260                                                 /* us allocated per uframe */
 261         u8                      tt_budget[EHCI_BANDWIDTH_SIZE];
 262                                                 /* us budgeted per uframe */
 263         struct list_head        tt_list;
 264
 265         /* platform-specific data -- must come last */
 266         unsigned long           priv[0] __aligned(sizeof(s64));
 267 };
 268
 269 /* convert between an HCD pointer and the corresponding EHCI_HCD */
 270 static inline struct ehci_hcd *hcd_to_ehci (struct usb_hcd *hcd)
 271 {
 272         return (struct ehci_hcd *) (hcd->hcd_priv);
 273 }
 274 static inline struct usb_hcd *ehci_to_hcd (struct ehci_hcd *ehci)
 275 {
 276         return container_of ((void *) ehci, struct usb_hcd, hcd_priv);
 277 }
 278
 279 /*-------------------------------------------------------------------------*/
 280
 281 #include <linux/usb/ehci_def.h>
 282
 283 /*-------------------------------------------------------------------------*/
 284
 285 #define QTD_NEXT(ehci, dma)     cpu_to_hc32(ehci, (u32)dma)
 286
 287 /*
 288  * EHCI Specification 0.95 Section 3.5
 289  * QTD: describe data transfer components (buffer, direction, ...)
 290  * See Fig 3-6 "Queue Element Transfer Descriptor Block Diagram".
 291  *
 292  * These are associated only with "QH" (Queue Head) structures,
 293  * used with control, bulk, and interrupt transfers.
 294  */
 295 struct ehci_qtd {
 296         /* first part defined by EHCI spec */
 297         __hc32                  hw_next;        /* see EHCI 3.5.1 */
 298         __hc32                  hw_alt_next;    /* see EHCI 3.5.2 */
 299         __hc32                  hw_token;       /* see EHCI 3.5.3 */
 300 #define QTD_TOGGLE      (1 << 31)       /* data toggle */
 301 #define QTD_LENGTH(tok) (((tok)>>16) & 0x7fff)
 302 #define QTD_IOC         (1 << 15)       /* interrupt on complete */
 303 #define QTD_CERR(tok)   (((tok)>>10) & 0x3)
 304 #define QTD_PID(tok)    (((tok)>>8) & 0x3)
 305 #define QTD_STS_ACTIVE  (1 << 7)        /* HC may execute this */
 306 #define QTD_STS_HALT    (1 << 6)        /* halted on error */
 307 #define QTD_STS_DBE     (1 << 5)        /* data buffer error (in HC) */
 308 #define QTD_STS_BABBLE  (1 << 4)        /* device was babbling (qtd halted) */
 309 #define QTD_STS_XACT    (1 << 3)        /* device gave illegal response */
 310 #define QTD_STS_MMF     (1 << 2)        /* incomplete split transaction */
 311 #define QTD_STS_STS     (1 << 1)        /* split transaction state */
 312 #define QTD_STS_PING    (1 << 0)        /* issue PING? */
 313
 314 #define ACTIVE_BIT(ehci)        cpu_to_hc32(ehci, QTD_STS_ACTIVE)
 315 #define HALT_BIT(ehci)          cpu_to_hc32(ehci, QTD_STS_HALT)
 316 #define STATUS_BIT(ehci)        cpu_to_hc32(ehci, QTD_STS_STS)
 317
 318         __hc32                  hw_buf [5];        /* see EHCI 3.5.4 */
 319         __hc32                  hw_buf_hi [5];        /* Appendix B */
 320
 321         /* the rest is HCD-private */
 322         dma_addr_t              qtd_dma;                /* qtd address */
 323         struct list_head        qtd_list;               /* sw qtd list */
 324         struct urb              *urb;                   /* qtd's urb */
 325         size_t                  length;                 /* length of buffer */
 326 } __attribute__ ((aligned (32)));
 327
 328 /* mask NakCnt+T in qh->hw_alt_next */
 329 #define QTD_MASK(ehci)  cpu_to_hc32 (ehci, ~0x1f)
 330
 331 #define IS_SHORT_READ(token) (QTD_LENGTH (token) != 0 && QTD_PID (token) == 1)
 332
 333 /*-------------------------------------------------------------------------*/
 334
 335 /* type tag from {qh,itd,sitd,fstn}->hw_next */
 336 #define Q_NEXT_TYPE(ehci,dma)   ((dma) & cpu_to_hc32(ehci, 3 << 1))
 337
 338 /*
 339  * Now the following defines are not converted using the
 340  * cpu_to_le32() macro anymore, since we have to support
 341  * "dynamic" switching between be and le support, so that the driver
 342  * can be used on one system with SoC EHCI controller using big-endian
 343  * descriptors as well as a normal little-endian PCI EHCI controller.
 344  */
 345 /* values for that type tag */
 346 #define Q_TYPE_ITD      (0 << 1)
 347 #define Q_TYPE_QH       (1 << 1)
 348 #define Q_TYPE_SITD     (2 << 1)
 349 #define Q_TYPE_FSTN     (3 << 1)
 350
 351 /* next async queue entry, or pointer to interrupt/periodic QH */
 352 #define QH_NEXT(ehci,dma)       (cpu_to_hc32(ehci, (((u32)dma)&~0x01f)|Q_TYPE_QH))
 353
 354 /* for periodic/async schedules and qtd lists, mark end of list */
 355 #define EHCI_LIST_END(ehci)     cpu_to_hc32(ehci, 1) /* "null pointer" to hw */
 356
 357 /*
 358  * Entries in periodic shadow table are pointers to one of four kinds
 359  * of data structure.  That's dictated by the hardware; a type tag is
 360  * encoded in the low bits of the hardware's periodic schedule.  Use
 361  * Q_NEXT_TYPE to get the tag.
 362  *
 363  * For entries in the async schedule, the type tag always says "qh".
 364  */
 365 union ehci_shadow {
 366         struct ehci_qh          *qh;            /* Q_TYPE_QH */
 367         struct ehci_itd         *itd;           /* Q_TYPE_ITD */
 368         struct ehci_sitd        *sitd;          /* Q_TYPE_SITD */
 369         struct ehci_fstn        *fstn;          /* Q_TYPE_FSTN */
 370         __hc32                  *hw_next;       /* (all types) */
 371         void                    *ptr;
 372 };
 373
 374 /*-------------------------------------------------------------------------*/
 375
 376 /*
 377  * EHCI Specification 0.95 Section 3.6
 378  * QH: describes control/bulk/interrupt endpoints
 379  * See Fig 3-7 "Queue Head Structure Layout".
 380  *
 381  * These appear in both the async and (for interrupt) periodic schedules.
 382  */
 383
 384 /* first part defined by EHCI spec */
 385 struct ehci_qh_hw {
 386         __hc32                  hw_next;        /* see EHCI 3.6.1 */
 387         __hc32                  hw_info1;       /* see EHCI 3.6.2 */
 388 #define QH_CONTROL_EP   (1 << 27)       /* FS/LS control endpoint */
 389 #define QH_HEAD         (1 << 15)       /* Head of async reclamation list */
 390 #define QH_TOGGLE_CTL   (1 << 14)       /* Data toggle control */
 391 #define QH_HIGH_SPEED   (2 << 12)       /* Endpoint speed */
 392 #define QH_LOW_SPEED    (1 << 12)
 393 #define QH_FULL_SPEED   (0 << 12)
 394 #define QH_INACTIVATE   (1 << 7)        /* Inactivate on next transaction */
 395         __hc32                  hw_info2;        /* see EHCI 3.6.2 */
 396 #define QH_SMASK        0x000000ff
 397 #define QH_CMASK        0x0000ff00
 398 #define QH_HUBADDR      0x007f0000
 399 #define QH_HUBPORT      0x3f800000
 400 #define QH_MULT         0xc0000000
 401         __hc32                  hw_current;     /* qtd list - see EHCI 3.6.4 */
 402
 403         /* qtd overlay (hardware parts of a struct ehci_qtd) */
 404         __hc32                  hw_qtd_next;
 405         __hc32                  hw_alt_next;
 406         __hc32                  hw_token;
 407         __hc32                  hw_buf [5];
 408         __hc32                  hw_buf_hi [5];
 409 } __attribute__ ((aligned(32)));
 410
 411 struct ehci_qh {
 412         struct ehci_qh_hw       *hw;            /* Must come first */
 413         /* the rest is HCD-private */
 414         dma_addr_t              qh_dma;         /* address of qh */
 415         union ehci_shadow       qh_next;        /* ptr to qh; or periodic */
 416         struct list_head        qtd_list;       /* sw qtd list */
 417         struct list_head        intr_node;      /* list of intr QHs */
 418         struct ehci_qtd         *dummy;
 419         struct list_head        unlink_node;
 420         struct ehci_per_sched   ps;             /* scheduling info */
 421
 422         unsigned                unlink_cycle;
 423
 424         u8                      qh_state;
 425 #define QH_STATE_LINKED         1               /* HC sees this */
 426 #define QH_STATE_UNLINK         2               /* HC may still see this */
 427 #define QH_STATE_IDLE           3               /* HC doesn't see this */
 428 #define QH_STATE_UNLINK_WAIT    4               /* LINKED and on unlink q */
 429 #define QH_STATE_COMPLETING     5               /* don't touch token.HALT */
 430
 431         u8                      xacterrs;       /* XactErr retry counter */
 432 #define QH_XACTERR_MAX          32              /* XactErr retry limit */
 433
 434         u8                      gap_uf;         /* uframes split/csplit gap */
 435
 436         unsigned                is_out:1;       /* bulk or intr OUT */
 437         unsigned                clearing_tt:1;  /* Clear-TT-Buf in progress */
 438         unsigned                dequeue_during_giveback:1;
 439         unsigned                exception:1;    /* got a fault, or an unlink
 440                                                    was requested */
 441 };
 442
 443 /*-------------------------------------------------------------------------*/
 444
 445 /* description of one iso transaction (up to 3 KB data if highspeed) */
 446 struct ehci_iso_packet {
 447         /* These will be copied to iTD when scheduling */
 448         u64                     bufp;           /* itd->hw_bufp{,_hi}[pg] |= */
 449         __hc32                  transaction;    /* itd->hw_transaction[i] |= */
 450         u8                      cross;          /* buf crosses pages */
 451         /* for full speed OUT splits */
 452         u32                     buf1;
 453 };
 454
 455 /* temporary schedule data for packets from iso urbs (both speeds)
 456  * each packet is one logical usb transaction to the device (not TT),
 457  * beginning at stream->next_uframe
 458  */
 459 struct ehci_iso_sched {
 460         struct list_head        td_list;
 461         unsigned                span;
 462         unsigned                first_packet;
 463         struct ehci_iso_packet  packet [0];
 464 };
 465
 466 /*
 467  * ehci_iso_stream - groups all (s)itds for this endpoint.
 468  * acts like a qh would, if EHCI had them for ISO.
 469  */
 470 struct ehci_iso_stream {
 471         /* first field matches ehci_hq, but is NULL */
 472         struct ehci_qh_hw       *hw;
 473
 474         u8                      bEndpointAddress;
 475         u8                      highspeed;
 476         struct list_head        td_list;        /* queued itds/sitds */
 477         struct list_head        free_list;      /* list of unused itds/sitds */
 478
 479         /* output of (re)scheduling */
 480         struct ehci_per_sched   ps;             /* scheduling info */
 481         unsigned                next_uframe;
 482         __hc32                  splits;
 483
 484         /* the rest is derived from the endpoint descriptor,
 485          * including the extra info for hw_bufp[0..2]
 486          */
 487         u16                     uperiod;        /* period in uframes */
 488         u16                     maxp;
 489         unsigned                bandwidth;
 490
 491         /* This is used to initialize iTD's hw_bufp fields */
 492         __hc32                  buf0;
 493         __hc32                  buf1;
 494         __hc32                  buf2;
 495
 496         /* this is used to initialize sITD's tt info */
 497         __hc32                  address;
 498 };
 499
 500 /*-------------------------------------------------------------------------*/
 501
 502 /*
 503  * EHCI Specification 0.95 Section 3.3
 504  * Fig 3-4 "Isochronous Transaction Descriptor (iTD)"
 505  *
 506  * Schedule records for high speed iso xfers
 507  */
 508 struct ehci_itd {
 509         /* first part defined by EHCI spec */
 510         __hc32                  hw_next;           /* see EHCI 3.3.1 */
 511         __hc32                  hw_transaction [8]; /* see EHCI 3.3.2 */
 512 #define EHCI_ISOC_ACTIVE        (1<<31)        /* activate transfer this slot */
 513 #define EHCI_ISOC_BUF_ERR       (1<<30)        /* Data buffer error */
 514 #define EHCI_ISOC_BABBLE        (1<<29)        /* babble detected */
 515 #define EHCI_ISOC_XACTERR       (1<<28)        /* XactErr - transaction error */
 516 #define EHCI_ITD_LENGTH(tok)    (((tok)>>16) & 0x0fff)
 517 #define EHCI_ITD_IOC            (1 << 15)       /* interrupt on complete */
 518
 519 #define ITD_ACTIVE(ehci)        cpu_to_hc32(ehci, EHCI_ISOC_ACTIVE)
 520
 521         __hc32                  hw_bufp [7];    /* see EHCI 3.3.3 */
 522         __hc32                  hw_bufp_hi [7]; /* Appendix B */
 523
 524         /* the rest is HCD-private */
 525         dma_addr_t              itd_dma;        /* for this itd */
 526         union ehci_shadow       itd_next;       /* ptr to periodic q entry */
 527
 528         struct urb              *urb;
 529         struct ehci_iso_stream  *stream;        /* endpoint's queue */
 530         struct list_head        itd_list;       /* list of stream's itds */
 531
 532         /* any/all hw_transactions here may be used by that urb */
 533         unsigned                frame;          /* where scheduled */
 534         unsigned                pg;
 535         unsigned                index[8];       /* in urb->iso_frame_desc */
 536 } __attribute__ ((aligned (32)));
 537
 538 /*-------------------------------------------------------------------------*/
 539
 540 /*
 541  * EHCI Specification 0.95 Section 3.4
 542  * siTD, aka split-transaction isochronous Transfer Descriptor
 543  *       ... describe full speed iso xfers through TT in hubs
 544  * see Figure 3-5 "Split-transaction Isochronous Transaction Descriptor (siTD)
 545  */
 546 struct ehci_sitd {
 547         /* first part defined by EHCI spec */
 548         __hc32                  hw_next;
 549 /* uses bit field macros above - see EHCI 0.95 Table 3-8 */
 550         __hc32                  hw_fullspeed_ep;        /* EHCI table 3-9 */
 551         __hc32                  hw_uframe;              /* EHCI table 3-10 */
 552         __hc32                  hw_results;             /* EHCI table 3-11 */
 553 #define SITD_IOC        (1 << 31)       /* interrupt on completion */
 554 #define SITD_PAGE       (1 << 30)       /* buffer 0/1 */
 555 #define SITD_LENGTH(x)  (0x3ff & ((x)>>16))
 556 #define SITD_STS_ACTIVE (1 << 7)        /* HC may execute this */
 557 #define SITD_STS_ERR    (1 << 6)        /* error from TT */
 558 #define SITD_STS_DBE    (1 << 5)        /* data buffer error (in HC) */
 559 #define SITD_STS_BABBLE (1 << 4)        /* device was babbling */
 560 #define SITD_STS_XACT   (1 << 3)        /* illegal IN response */
 561 #define SITD_STS_MMF    (1 << 2)        /* incomplete split transaction */
 562 #define SITD_STS_STS    (1 << 1)        /* split transaction state */
 563
 564 #define SITD_ACTIVE(ehci)       cpu_to_hc32(ehci, SITD_STS_ACTIVE)
 565
 566         __hc32                  hw_buf [2];             /* EHCI table 3-12 */
 567         __hc32                  hw_backpointer;         /* EHCI table 3-13 */
 568         __hc32                  hw_buf_hi [2];          /* Appendix B */
 569
 570         /* the rest is HCD-private */
 571         dma_addr_t              sitd_dma;
 572         union ehci_shadow       sitd_next;      /* ptr to periodic q entry */
 573
 574         struct urb              *urb;
 575         struct ehci_iso_stream  *stream;        /* endpoint's queue */
 576         struct list_head        sitd_list;      /* list of stream's sitds */
 577         unsigned                frame;
 578         unsigned                index;
 579 } __attribute__ ((aligned (32)));
 580
 581 /*-------------------------------------------------------------------------*/
 582
 583 /*
 584  * EHCI Specification 0.96 Section 3.7
 585  * Periodic Frame Span Traversal Node (FSTN)
 586  *
 587  * Manages split interrupt transactions (using TT) that span frame boundaries
 588  * into uframes 0/1; see 4.12.2.2.  In those uframes, a "save place" FSTN
 589  * makes the HC jump (back) to a QH to scan for fs/ls QH completions until
 590  * it hits a "restore" FSTN; then it returns to finish other uframe 0/1 work.
 591  */
 592 struct ehci_fstn {
 593         __hc32                  hw_next;        /* any periodic q entry */
 594         __hc32                  hw_prev;        /* qh or EHCI_LIST_END */
 595
 596         /* the rest is HCD-private */
 597         dma_addr_t              fstn_dma;
 598         union ehci_shadow       fstn_next;      /* ptr to periodic q entry */
 599 } __attribute__ ((aligned (32)));
 600
 601 /*-------------------------------------------------------------------------*/
 602
 603 /*
 604  * USB-2.0 Specification Sections 11.14 and 11.18
 605  * Scheduling and budgeting split transactions using TTs
 606  *
 607  * A hub can have a single TT for all its ports, or multiple TTs (one for each
 608  * port).  The bandwidth and budgeting information for the full/low-speed bus
 609  * below each TT is self-contained and independent of the other TTs or the
 610  * high-speed bus.
 611  *
 612  * "Bandwidth" refers to the number of microseconds on the FS/LS bus allocated
 613  * to an interrupt or isochronous endpoint for each frame.  "Budget" refers to
 614  * the best-case estimate of the number of full-speed bytes allocated to an
 615  * endpoint for each microframe within an allocated frame.
 616  *
 617  * Removal of an endpoint invalidates a TT's budget.  Instead of trying to
 618  * keep an up-to-date record, we recompute the budget when it is needed.
 619  */
 620
 621 struct ehci_tt {
 622         u16                     bandwidth[EHCI_BANDWIDTH_FRAMES];
 623
 624         struct list_head        tt_list;        /* List of all ehci_tt's */
 625         struct list_head        ps_list;        /* Items using this TT */
 626         struct usb_tt           *usb_tt;
 627         int                     tt_port;        /* TT port number */
 628 };
 629
 630 /*-------------------------------------------------------------------------*/
 631
 632 /* Prepare the PORTSC wakeup flags during controller suspend/resume */
 633
 634 #define ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup)      \
 635                 ehci_adjust_port_wakeup_flags(ehci, true, do_wakeup);
 636
 637 #define ehci_prepare_ports_for_controller_resume(ehci)                  \
 638                 ehci_adjust_port_wakeup_flags(ehci, false, false);
 639
 640 /*-------------------------------------------------------------------------*/
 641
 642 #ifdef CONFIG_USB_EHCI_ROOT_HUB_TT
 643
 644 /*
 645  * Some EHCI controllers have a Transaction Translator built into the
 646  * root hub. This is a non-standard feature.  Each controller will need
 647  * to add code to the following inline functions, and call them as
 648  * needed (mostly in root hub code).
 649  */
 650
 651 #define ehci_is_TDI(e)                  (ehci_to_hcd(e)->has_tt)
 652
 653 /* Returns the speed of a device attached to a port on the root hub. */
 654 static inline unsigned int
 655 ehci_port_speed(struct ehci_hcd *ehci, unsigned int portsc)
 656 {
 657         if (ehci_is_TDI(ehci)) {
 658                 switch ((portsc >> (ehci->has_hostpc ? 25 : 26)) & 3) {
 659                 case 0:
 660                         return 0;
 661                 case 1:
 662                         return USB_PORT_STAT_LOW_SPEED;
 663                 case 2:
 664                 default:
 665                         return USB_PORT_STAT_HIGH_SPEED;
 666                 }
 667         }
 668         return USB_PORT_STAT_HIGH_SPEED;
 669 }
 670
 671 #else
 672
 673 #define ehci_is_TDI(e)                  (0)
 674
 675 #define ehci_port_speed(ehci, portsc)   USB_PORT_STAT_HIGH_SPEED
 676 #endif
 677
 678 /*-------------------------------------------------------------------------*/
 679
 680 #ifdef CONFIG_PPC_83xx
 681 /* Some Freescale processors have an erratum in which the TT
 682  * port number in the queue head was 0..N-1 instead of 1..N.
 683  */
 684 #define ehci_has_fsl_portno_bug(e)              ((e)->has_fsl_port_bug)
 685 #else
 686 #define ehci_has_fsl_portno_bug(e)              (0)
 687 #endif
 688
 689 /*
 690  * While most USB host controllers implement their registers in
 691  * little-endian format, a minority (celleb companion chip) implement
 692  * them in big endian format.
 693  *
 694  * This attempts to support either format at compile time without a
 695  * runtime penalty, or both formats with the additional overhead
 696  * of checking a flag bit.
 697  *
 698  * ehci_big_endian_capbase is a special quirk for controllers that
 699  * implement the HC capability registers as separate registers and not
 700  * as fields of a 32-bit register.
 701  */
 702
 703 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 704 #define ehci_big_endian_mmio(e)         ((e)->big_endian_mmio)
 705 #define ehci_big_endian_capbase(e)      ((e)->big_endian_capbase)
 706 #else
 707 #define ehci_big_endian_mmio(e)         0
 708 #define ehci_big_endian_capbase(e)      0
 709 #endif
 710
 711 /*
 712  * Big-endian read/write functions are arch-specific.
 713  * Other arches can be added if/when they're needed.
 714  */
 715 #if defined(CONFIG_ARM) && defined(CONFIG_ARCH_IXP4XX)
 716 #define readl_be(addr)          __raw_readl((__force unsigned *)addr)
 717 #define writel_be(val, addr)    __raw_writel(val, (__force unsigned *)addr)
 718 #endif
 719
 720 static inline unsigned int ehci_readl(const struct ehci_hcd *ehci,
 721                 __u32 __iomem * regs)
 722 {
 723 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 724         return ehci_big_endian_mmio(ehci) ?
 725                 readl_be(regs) :
 726                 readl(regs);
 727 #else
 728         return readl(regs);
 729 #endif
 730 }
 731
 732 #ifdef CONFIG_SOC_IMX28
 733 static inline void imx28_ehci_writel(const unsigned int val,
 734                 volatile __u32 __iomem *addr)
 735 {
 736         __asm__ ("swp %0, %0, [%1]" : : "r"(val), "r"(addr));
 737 }
 738 #else
 739 static inline void imx28_ehci_writel(const unsigned int val,
 740                 volatile __u32 __iomem *addr)
 741 {
 742 }
 743 #endif
 744 static inline void ehci_writel(const struct ehci_hcd *ehci,
 745                 const unsigned int val, __u32 __iomem *regs)
 746 {
 747 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 748         ehci_big_endian_mmio(ehci) ?
 749                 writel_be(val, regs) :
 750                 writel(val, regs);
 751 #else
 752         if (ehci->imx28_write_fix)
 753                 imx28_ehci_writel(val, regs);
 754         else
 755                 writel(val, regs);
 756 #endif
 757 }
 758
 759 /*
 760  * On certain ppc-44x SoC there is a HW issue, that could only worked around with
 761  * explicit suspend/operate of OHCI. This function hereby makes sense only on that arch.
 762  * Other common bits are dependent on has_amcc_usb23 quirk flag.
 763  */
 764 #ifdef CONFIG_44x
 765 static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
 766 {
 767         u32 hc_control;
 768
 769         hc_control = (readl_be(ehci->ohci_hcctrl_reg) & ~OHCI_CTRL_HCFS);
 770         if (operational)
 771                 hc_control |= OHCI_USB_OPER;
 772         else
 773                 hc_control |= OHCI_USB_SUSPEND;
 774
 775         writel_be(hc_control, ehci->ohci_hcctrl_reg);
 776         (void) readl_be(ehci->ohci_hcctrl_reg);
 777 }
 778 #else
 779 static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
 780 { }
 781 #endif
 782
 783 /*-------------------------------------------------------------------------*/
 784
 785 /*
 786  * The AMCC 440EPx not only implements its EHCI registers in big-endian
 787  * format, but also its DMA data structures (descriptors).
 788  *
 789  * EHCI controllers accessed through PCI work normally (little-endian
 790  * everywhere), so we won't bother supporting a BE-only mode for now.
 791  */
 792 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
 793 #define ehci_big_endian_desc(e)         ((e)->big_endian_desc)
 794
 795 /* cpu to ehci */
 796 static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x)
 797 {
 798         return ehci_big_endian_desc(ehci)
 799                 ? (__force __hc32)cpu_to_be32(x)
 800                 : (__force __hc32)cpu_to_le32(x);
 801 }
 802
 803 /* ehci to cpu */
 804 static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x)
 805 {
 806         return ehci_big_endian_desc(ehci)
 807                 ? be32_to_cpu((__force __be32)x)
 808                 : le32_to_cpu((__force __le32)x);
 809 }
 810
 811 static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
 812 {
 813         return ehci_big_endian_desc(ehci)
 814                 ? be32_to_cpup((__force __be32 *)x)
 815                 : le32_to_cpup((__force __le32 *)x);
 816 }
 817
 818 #else
 819
 820 /* cpu to ehci */
 821 static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x)
 822 {
 823         return cpu_to_le32(x);
 824 }
 825
 826 /* ehci to cpu */
 827 static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x)
 828 {
 829         return le32_to_cpu(x);
 830 }
 831
 832 static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
 833 {
 834         return le32_to_cpup(x);
 835 }
 836
 837 #endif
 838
 839 /*-------------------------------------------------------------------------*/
 840
 841 #define ehci_dbg(ehci, fmt, args...) \
 842         dev_dbg(ehci_to_hcd(ehci)->self.controller , fmt , ## args)
 843 #define ehci_err(ehci, fmt, args...) \
 844         dev_err(ehci_to_hcd(ehci)->self.controller , fmt , ## args)
 845 #define ehci_info(ehci, fmt, args...) \
 846         dev_info(ehci_to_hcd(ehci)->self.controller , fmt , ## args)
 847 #define ehci_warn(ehci, fmt, args...) \
 848         dev_warn(ehci_to_hcd(ehci)->self.controller , fmt , ## args)
 849
 850
 851 #ifndef CONFIG_DYNAMIC_DEBUG
 852 #define STUB_DEBUG_FILES
 853 #endif
 854
 855 /*-------------------------------------------------------------------------*/
 856
 857 /* Declarations of things exported for use by ehci platform drivers */
 858
 859 struct ehci_driver_overrides {
 860         size_t          extra_priv_size;
 861         int             (*reset)(struct usb_hcd *hcd);
 862 };
 863
 864 extern void     ehci_init_driver(struct hc_driver *drv,
 865                                 const struct ehci_driver_overrides *over);
 866 extern int      ehci_setup(struct usb_hcd *hcd);
 867 extern int      ehci_handshake(struct ehci_hcd *ehci, void __iomem *ptr,
 868                                 u32 mask, u32 done, int usec);
 869
 870 #ifdef CONFIG_PM
 871 extern int      ehci_suspend(struct usb_hcd *hcd, bool do_wakeup);
 872 extern int      ehci_resume(struct usb_hcd *hcd, bool hibernated);
 873 #endif  /* CONFIG_PM */
 874
 875 #endif /* __LINUX_EHCI_HCD_H */