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 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         /* per root hub port */
  91         unsigned long           reset_done [EHCI_MAX_ROOT_PORTS];
  92
  93         /* bit vectors (one bit per port) */
  94         unsigned long           bus_suspended;          /* which ports were
  95                         already suspended at the start of a bus suspend */
  96         unsigned long           companion_ports;        /* which ports are
  97                         dedicated to the companion controller */
  98         unsigned long           owned_ports;            /* which ports are
  99                         owned by the companion during a bus suspend */
 100         unsigned long           port_c_suspend;         /* which ports have
 101                         the change-suspend feature turned on */
 102
 103         /* per-HC memory pools (could be per-bus, but ...) */
 104         struct dma_pool         *qh_pool;       /* qh per active urb */
 105         struct dma_pool         *qtd_pool;      /* one or more per qh */
 106         struct dma_pool         *itd_pool;      /* itd per iso urb */
 107         struct dma_pool         *sitd_pool;     /* sitd per split iso urb */
 108
 109         struct timer_list       iaa_watchdog;
 110         struct timer_list       watchdog;
 111         unsigned long           actions;
 112         unsigned                stamp;
 113         unsigned long           next_statechange;
 114         u32                     command;
 115
 116         /* SILICON QUIRKS */
 117         unsigned                no_selective_suspend:1;
 118         unsigned                has_fsl_port_bug:1; /* FreeScale */
 119         unsigned                big_endian_mmio:1;
 120         unsigned                big_endian_desc:1;
 121
 122         u8                      sbrn;           /* packed release number */
 123
 124         /* irq statistics */
 125 #ifdef EHCI_STATS
 126         struct ehci_stats       stats;
 127 #       define COUNT(x) do { (x)++; } while (0)
 128 #else
 129 #       define COUNT(x) do {} while (0)
 130 #endif
 131
 132         /* debug files */
 133 #ifdef DEBUG
 134         struct dentry           *debug_dir;
 135         struct dentry           *debug_async;
 136         struct dentry           *debug_periodic;
 137         struct dentry           *debug_registers;
 138 #endif
 139 };
 140
 141 /* convert between an HCD pointer and the corresponding EHCI_HCD */
 142 static inline struct ehci_hcd *hcd_to_ehci (struct usb_hcd *hcd)
 143 {
 144         return (struct ehci_hcd *) (hcd->hcd_priv);
 145 }
 146 static inline struct usb_hcd *ehci_to_hcd (struct ehci_hcd *ehci)
 147 {
 148         return container_of ((void *) ehci, struct usb_hcd, hcd_priv);
 149 }
 150
 151
 152 static inline void
 153 iaa_watchdog_start(struct ehci_hcd *ehci)
 154 {
 155         WARN_ON(timer_pending(&ehci->iaa_watchdog));
 156         mod_timer(&ehci->iaa_watchdog,
 157                         jiffies + msecs_to_jiffies(EHCI_IAA_MSECS));
 158 }
 159
 160 static inline void iaa_watchdog_done(struct ehci_hcd *ehci)
 161 {
 162         del_timer(&ehci->iaa_watchdog);
 163 }
 164
 165 enum ehci_timer_action {
 166         TIMER_IO_WATCHDOG,
 167         TIMER_ASYNC_SHRINK,
 168         TIMER_ASYNC_OFF,
 169 };
 170
 171 static inline void
 172 timer_action_done (struct ehci_hcd *ehci, enum ehci_timer_action action)
 173 {
 174         clear_bit (action, &ehci->actions);
 175 }
 176
 177 static inline void
 178 timer_action (struct ehci_hcd *ehci, enum ehci_timer_action action)
 179 {
 180         /* Don't override timeouts which shrink or (later) disable
 181          * the async ring; just the I/O watchdog.  Note that if a
 182          * SHRINK were pending, OFF would never be requested.
 183          */
 184         if (timer_pending(&ehci->watchdog)
 185                         && ((BIT(TIMER_ASYNC_SHRINK) | BIT(TIMER_ASYNC_OFF))
 186                                 & ehci->actions))
 187                 return;
 188
 189         if (!test_and_set_bit (action, &ehci->actions)) {
 190                 unsigned long t;
 191
 192                 switch (action) {
 193                 case TIMER_IO_WATCHDOG:
 194                         t = EHCI_IO_JIFFIES;
 195                         break;
 196                 case TIMER_ASYNC_OFF:
 197                         t = EHCI_ASYNC_JIFFIES;
 198                         break;
 199                 // case TIMER_ASYNC_SHRINK:
 200                 default:
 201                         t = EHCI_SHRINK_JIFFIES;
 202                         break;
 203                 }
 204                 mod_timer(&ehci->watchdog, t + jiffies);
 205         }
 206 }
 207
 208 /*-------------------------------------------------------------------------*/
 209
 210 /* EHCI register interface, corresponds to EHCI Revision 0.95 specification */
 211
 212 /* Section 2.2 Host Controller Capability Registers */
 213 struct ehci_caps {
 214         /* these fields are specified as 8 and 16 bit registers,
 215          * but some hosts can't perform 8 or 16 bit PCI accesses.
 216          */
 217         u32             hc_capbase;
 218 #define HC_LENGTH(p)            (((p)>>00)&0x00ff)      /* bits 7:0 */
 219 #define HC_VERSION(p)           (((p)>>16)&0xffff)      /* bits 31:16 */
 220         u32             hcs_params;     /* HCSPARAMS - offset 0x4 */
 221 #define HCS_DEBUG_PORT(p)       (((p)>>20)&0xf) /* bits 23:20, debug port? */
 222 #define HCS_INDICATOR(p)        ((p)&(1 << 16)) /* true: has port indicators */
 223 #define HCS_N_CC(p)             (((p)>>12)&0xf) /* bits 15:12, #companion HCs */
 224 #define HCS_N_PCC(p)            (((p)>>8)&0xf)  /* bits 11:8, ports per CC */
 225 #define HCS_PORTROUTED(p)       ((p)&(1 << 7))  /* true: port routing */
 226 #define HCS_PPC(p)              ((p)&(1 << 4))  /* true: port power control */
 227 #define HCS_N_PORTS(p)          (((p)>>0)&0xf)  /* bits 3:0, ports on HC */
 228
 229         u32             hcc_params;      /* HCCPARAMS - offset 0x8 */
 230 #define HCC_EXT_CAPS(p)         (((p)>>8)&0xff) /* for pci extended caps */
 231 #define HCC_ISOC_CACHE(p)       ((p)&(1 << 7))  /* true: can cache isoc frame */
 232 #define HCC_ISOC_THRES(p)       (((p)>>4)&0x7)  /* bits 6:4, uframes cached */
 233 #define HCC_CANPARK(p)          ((p)&(1 << 2))  /* true: can park on async qh */
 234 #define HCC_PGM_FRAMELISTLEN(p) ((p)&(1 << 1))  /* true: periodic_size changes*/
 235 #define HCC_64BIT_ADDR(p)       ((p)&(1))       /* true: can use 64-bit addr */
 236         u8              portroute [8];   /* nibbles for routing - offset 0xC */
 237 } __attribute__ ((packed));
 238
 239
 240 /* Section 2.3 Host Controller Operational Registers */
 241 struct ehci_regs {
 242
 243         /* USBCMD: offset 0x00 */
 244         u32             command;
 245 /* 23:16 is r/w intr rate, in microframes; default "8" == 1/msec */
 246 #define CMD_PARK        (1<<11)         /* enable "park" on async qh */
 247 #define CMD_PARK_CNT(c) (((c)>>8)&3)    /* how many transfers to park for */
 248 #define CMD_LRESET      (1<<7)          /* partial reset (no ports, etc) */
 249 #define CMD_IAAD        (1<<6)          /* "doorbell" interrupt async advance */
 250 #define CMD_ASE         (1<<5)          /* async schedule enable */
 251 #define CMD_PSE         (1<<4)          /* periodic schedule enable */
 252 /* 3:2 is periodic frame list size */
 253 #define CMD_RESET       (1<<1)          /* reset HC not bus */
 254 #define CMD_RUN         (1<<0)          /* start/stop HC */
 255
 256         /* USBSTS: offset 0x04 */
 257         u32             status;
 258 #define STS_ASS         (1<<15)         /* Async Schedule Status */
 259 #define STS_PSS         (1<<14)         /* Periodic Schedule Status */
 260 #define STS_RECL        (1<<13)         /* Reclamation */
 261 #define STS_HALT        (1<<12)         /* Not running (any reason) */
 262 /* some bits reserved */
 263         /* these STS_* flags are also intr_enable bits (USBINTR) */
 264 #define STS_IAA         (1<<5)          /* Interrupted on async advance */
 265 #define STS_FATAL       (1<<4)          /* such as some PCI access errors */
 266 #define STS_FLR         (1<<3)          /* frame list rolled over */
 267 #define STS_PCD         (1<<2)          /* port change detect */
 268 #define STS_ERR         (1<<1)          /* "error" completion (overflow, ...) */
 269 #define STS_INT         (1<<0)          /* "normal" completion (short, ...) */
 270
 271         /* USBINTR: offset 0x08 */
 272         u32             intr_enable;
 273
 274         /* FRINDEX: offset 0x0C */
 275         u32             frame_index;    /* current microframe number */
 276         /* CTRLDSSEGMENT: offset 0x10 */
 277         u32             segment;        /* address bits 63:32 if needed */
 278         /* PERIODICLISTBASE: offset 0x14 */
 279         u32             frame_list;     /* points to periodic list */
 280         /* ASYNCLISTADDR: offset 0x18 */
 281         u32             async_next;     /* address of next async queue head */
 282
 283         u32             reserved [9];
 284
 285         /* CONFIGFLAG: offset 0x40 */
 286         u32             configured_flag;
 287 #define FLAG_CF         (1<<0)          /* true: we'll support "high speed" */
 288
 289         /* PORTSC: offset 0x44 */
 290         u32             port_status [0];        /* up to N_PORTS */
 291 /* 31:23 reserved */
 292 #define PORT_WKOC_E     (1<<22)         /* wake on overcurrent (enable) */
 293 #define PORT_WKDISC_E   (1<<21)         /* wake on disconnect (enable) */
 294 #define PORT_WKCONN_E   (1<<20)         /* wake on connect (enable) */
 295 /* 19:16 for port testing */
 296 #define PORT_LED_OFF    (0<<14)
 297 #define PORT_LED_AMBER  (1<<14)
 298 #define PORT_LED_GREEN  (2<<14)
 299 #define PORT_LED_MASK   (3<<14)
 300 #define PORT_OWNER      (1<<13)         /* true: companion hc owns this port */
 301 #define PORT_POWER      (1<<12)         /* true: has power (see PPC) */
 302 #define PORT_USB11(x) (((x)&(3<<10))==(1<<10))  /* USB 1.1 device */
 303 /* 11:10 for detecting lowspeed devices (reset vs release ownership) */
 304 /* 9 reserved */
 305 #define PORT_RESET      (1<<8)          /* reset port */
 306 #define PORT_SUSPEND    (1<<7)          /* suspend port */
 307 #define PORT_RESUME     (1<<6)          /* resume it */
 308 #define PORT_OCC        (1<<5)          /* over current change */
 309 #define PORT_OC         (1<<4)          /* over current active */
 310 #define PORT_PEC        (1<<3)          /* port enable change */
 311 #define PORT_PE         (1<<2)          /* port enable */
 312 #define PORT_CSC        (1<<1)          /* connect status change */
 313 #define PORT_CONNECT    (1<<0)          /* device connected */
 314 #define PORT_RWC_BITS   (PORT_CSC | PORT_PEC | PORT_OCC)
 315 } __attribute__ ((packed));
 316
 317 #define USBMODE         0x68            /* USB Device mode */
 318 #define USBMODE_SDIS    (1<<3)          /* Stream disable */
 319 #define USBMODE_BE      (1<<2)          /* BE/LE endianness select */
 320 #define USBMODE_CM_HC   (3<<0)          /* host controller mode */
 321 #define USBMODE_CM_IDLE (0<<0)          /* idle state */
 322
 323 /* Appendix C, Debug port ... intended for use with special "debug devices"
 324  * that can help if there's no serial console.  (nonstandard enumeration.)
 325  */
 326 struct ehci_dbg_port {
 327         u32     control;
 328 #define DBGP_OWNER      (1<<30)
 329 #define DBGP_ENABLED    (1<<28)
 330 #define DBGP_DONE       (1<<16)
 331 #define DBGP_INUSE      (1<<10)
 332 #define DBGP_ERRCODE(x) (((x)>>7)&0x07)
 333 #       define DBGP_ERR_BAD     1
 334 #       define DBGP_ERR_SIGNAL  2
 335 #define DBGP_ERROR      (1<<6)
 336 #define DBGP_GO         (1<<5)
 337 #define DBGP_OUT        (1<<4)
 338 #define DBGP_LEN(x)     (((x)>>0)&0x0f)
 339         u32     pids;
 340 #define DBGP_PID_GET(x)         (((x)>>16)&0xff)
 341 #define DBGP_PID_SET(data,tok)  (((data)<<8)|(tok))
 342         u32     data03;
 343         u32     data47;
 344         u32     address;
 345 #define DBGP_EPADDR(dev,ep)     (((dev)<<8)|(ep))
 346 } __attribute__ ((packed));
 347
 348 /*-------------------------------------------------------------------------*/
 349
 350 #define QTD_NEXT(ehci, dma)     cpu_to_hc32(ehci, (u32)dma)
 351
 352 /*
 353  * EHCI Specification 0.95 Section 3.5
 354  * QTD: describe data transfer components (buffer, direction, ...)
 355  * See Fig 3-6 "Queue Element Transfer Descriptor Block Diagram".
 356  *
 357  * These are associated only with "QH" (Queue Head) structures,
 358  * used with control, bulk, and interrupt transfers.
 359  */
 360 struct ehci_qtd {
 361         /* first part defined by EHCI spec */
 362         __hc32                  hw_next;        /* see EHCI 3.5.1 */
 363         __hc32                  hw_alt_next;    /* see EHCI 3.5.2 */
 364         __hc32                  hw_token;       /* see EHCI 3.5.3 */
 365 #define QTD_TOGGLE      (1 << 31)       /* data toggle */
 366 #define QTD_LENGTH(tok) (((tok)>>16) & 0x7fff)
 367 #define QTD_IOC         (1 << 15)       /* interrupt on complete */
 368 #define QTD_CERR(tok)   (((tok)>>10) & 0x3)
 369 #define QTD_PID(tok)    (((tok)>>8) & 0x3)
 370 #define QTD_STS_ACTIVE  (1 << 7)        /* HC may execute this */
 371 #define QTD_STS_HALT    (1 << 6)        /* halted on error */
 372 #define QTD_STS_DBE     (1 << 5)        /* data buffer error (in HC) */
 373 #define QTD_STS_BABBLE  (1 << 4)        /* device was babbling (qtd halted) */
 374 #define QTD_STS_XACT    (1 << 3)        /* device gave illegal response */
 375 #define QTD_STS_MMF     (1 << 2)        /* incomplete split transaction */
 376 #define QTD_STS_STS     (1 << 1)        /* split transaction state */
 377 #define QTD_STS_PING    (1 << 0)        /* issue PING? */
 378
 379 #define ACTIVE_BIT(ehci)        cpu_to_hc32(ehci, QTD_STS_ACTIVE)
 380 #define HALT_BIT(ehci)          cpu_to_hc32(ehci, QTD_STS_HALT)
 381 #define STATUS_BIT(ehci)        cpu_to_hc32(ehci, QTD_STS_STS)
 382
 383         __hc32                  hw_buf [5];        /* see EHCI 3.5.4 */
 384         __hc32                  hw_buf_hi [5];        /* Appendix B */
 385
 386         /* the rest is HCD-private */
 387         dma_addr_t              qtd_dma;                /* qtd address */
 388         struct list_head        qtd_list;               /* sw qtd list */
 389         struct urb              *urb;                   /* qtd's urb */
 390         size_t                  length;                 /* length of buffer */
 391 } __attribute__ ((aligned (32)));
 392
 393 /* mask NakCnt+T in qh->hw_alt_next */
 394 #define QTD_MASK(ehci)  cpu_to_hc32 (ehci, ~0x1f)
 395
 396 #define IS_SHORT_READ(token) (QTD_LENGTH (token) != 0 && QTD_PID (token) == 1)
 397
 398 /*-------------------------------------------------------------------------*/
 399
 400 /* type tag from {qh,itd,sitd,fstn}->hw_next */
 401 #define Q_NEXT_TYPE(ehci,dma)   ((dma) & cpu_to_hc32(ehci, 3 << 1))
 402
 403 /*
 404  * Now the following defines are not converted using the
 405  * __constant_cpu_to_le32() macro anymore, since we have to support
 406  * "dynamic" switching between be and le support, so that the driver
 407  * can be used on one system with SoC EHCI controller using big-endian
 408  * descriptors as well as a normal little-endian PCI EHCI controller.
 409  */
 410 /* values for that type tag */
 411 #define Q_TYPE_ITD      (0 << 1)
 412 #define Q_TYPE_QH       (1 << 1)
 413 #define Q_TYPE_SITD     (2 << 1)
 414 #define Q_TYPE_FSTN     (3 << 1)
 415
 416 /* next async queue entry, or pointer to interrupt/periodic QH */
 417 #define QH_NEXT(ehci,dma)       (cpu_to_hc32(ehci, (((u32)dma)&~0x01f)|Q_TYPE_QH))
 418
 419 /* for periodic/async schedules and qtd lists, mark end of list */
 420 #define EHCI_LIST_END(ehci)     cpu_to_hc32(ehci, 1) /* "null pointer" to hw */
 421
 422 /*
 423  * Entries in periodic shadow table are pointers to one of four kinds
 424  * of data structure.  That's dictated by the hardware; a type tag is
 425  * encoded in the low bits of the hardware's periodic schedule.  Use
 426  * Q_NEXT_TYPE to get the tag.
 427  *
 428  * For entries in the async schedule, the type tag always says "qh".
 429  */
 430 union ehci_shadow {
 431         struct ehci_qh          *qh;            /* Q_TYPE_QH */
 432         struct ehci_itd         *itd;           /* Q_TYPE_ITD */
 433         struct ehci_sitd        *sitd;          /* Q_TYPE_SITD */
 434         struct ehci_fstn        *fstn;          /* Q_TYPE_FSTN */
 435         __hc32                  *hw_next;       /* (all types) */
 436         void                    *ptr;
 437 };
 438
 439 /*-------------------------------------------------------------------------*/
 440
 441 /*
 442  * EHCI Specification 0.95 Section 3.6
 443  * QH: describes control/bulk/interrupt endpoints
 444  * See Fig 3-7 "Queue Head Structure Layout".
 445  *
 446  * These appear in both the async and (for interrupt) periodic schedules.
 447  */
 448
 449 struct ehci_qh {
 450         /* first part defined by EHCI spec */
 451         __hc32                  hw_next;        /* see EHCI 3.6.1 */
 452         __hc32                  hw_info1;       /* see EHCI 3.6.2 */
 453 #define QH_HEAD         0x00008000
 454         __hc32                  hw_info2;        /* see EHCI 3.6.2 */
 455 #define QH_SMASK        0x000000ff
 456 #define QH_CMASK        0x0000ff00
 457 #define QH_HUBADDR      0x007f0000
 458 #define QH_HUBPORT      0x3f800000
 459 #define QH_MULT         0xc0000000
 460         __hc32                  hw_current;     /* qtd list - see EHCI 3.6.4 */
 461
 462         /* qtd overlay (hardware parts of a struct ehci_qtd) */
 463         __hc32                  hw_qtd_next;
 464         __hc32                  hw_alt_next;
 465         __hc32                  hw_token;
 466         __hc32                  hw_buf [5];
 467         __hc32                  hw_buf_hi [5];
 468
 469         /* the rest is HCD-private */
 470         dma_addr_t              qh_dma;         /* address of qh */
 471         union ehci_shadow       qh_next;        /* ptr to qh; or periodic */
 472         struct list_head        qtd_list;       /* sw qtd list */
 473         struct ehci_qtd         *dummy;
 474         struct ehci_qh          *reclaim;       /* next to reclaim */
 475
 476         struct ehci_hcd         *ehci;
 477
 478         /*
 479          * Do NOT use atomic operations for QH refcounting. On some CPUs
 480          * (PPC7448 for example), atomic operations cannot be performed on
 481          * memory that is cache-inhibited (i.e. being used for DMA).
 482          * Spinlocks are used to protect all QH fields.
 483          */
 484         u32                     refcount;
 485         unsigned                stamp;
 486
 487         u8                      qh_state;
 488 #define QH_STATE_LINKED         1               /* HC sees this */
 489 #define QH_STATE_UNLINK         2               /* HC may still see this */
 490 #define QH_STATE_IDLE           3               /* HC doesn't see this */
 491 #define QH_STATE_UNLINK_WAIT    4               /* LINKED and on reclaim q */
 492 #define QH_STATE_COMPLETING     5               /* don't touch token.HALT */
 493
 494         /* periodic schedule info */
 495         u8                      usecs;          /* intr bandwidth */
 496         u8                      gap_uf;         /* uframes split/csplit gap */
 497         u8                      c_usecs;        /* ... split completion bw */
 498         u16                     tt_usecs;       /* tt downstream bandwidth */
 499         unsigned short          period;         /* polling interval */
 500         unsigned short          start;          /* where polling starts */
 501 #define NO_FRAME ((unsigned short)~0)                   /* pick new start */
 502         struct usb_device       *dev;           /* access to TT */
 503 } __attribute__ ((aligned (32)));
 504
 505 /*-------------------------------------------------------------------------*/
 506
 507 /* description of one iso transaction (up to 3 KB data if highspeed) */
 508 struct ehci_iso_packet {
 509         /* These will be copied to iTD when scheduling */
 510         u64                     bufp;           /* itd->hw_bufp{,_hi}[pg] |= */
 511         __hc32                  transaction;    /* itd->hw_transaction[i] |= */
 512         u8                      cross;          /* buf crosses pages */
 513         /* for full speed OUT splits */
 514         u32                     buf1;
 515 };
 516
 517 /* temporary schedule data for packets from iso urbs (both speeds)
 518  * each packet is one logical usb transaction to the device (not TT),
 519  * beginning at stream->next_uframe
 520  */
 521 struct ehci_iso_sched {
 522         struct list_head        td_list;
 523         unsigned                span;
 524         struct ehci_iso_packet  packet [0];
 525 };
 526
 527 /*
 528  * ehci_iso_stream - groups all (s)itds for this endpoint.
 529  * acts like a qh would, if EHCI had them for ISO.
 530  */
 531 struct ehci_iso_stream {
 532         /* first two fields match QH, but info1 == 0 */
 533         __hc32                  hw_next;
 534         __hc32                  hw_info1;
 535
 536         u32                     refcount;
 537         u8                      bEndpointAddress;
 538         u8                      highspeed;
 539         u16                     depth;          /* depth in uframes */
 540         struct list_head        td_list;        /* queued itds/sitds */
 541         struct list_head        free_list;      /* list of unused itds/sitds */
 542         struct usb_device       *udev;
 543         struct usb_host_endpoint *ep;
 544
 545         /* output of (re)scheduling */
 546         unsigned long           start;          /* jiffies */
 547         unsigned long           rescheduled;
 548         int                     next_uframe;
 549         __hc32                  splits;
 550
 551         /* the rest is derived from the endpoint descriptor,
 552          * trusting urb->interval == f(epdesc->bInterval) and
 553          * including the extra info for hw_bufp[0..2]
 554          */
 555         u8                      usecs, c_usecs;
 556         u16                     interval;
 557         u16                     tt_usecs;
 558         u16                     maxp;
 559         u16                     raw_mask;
 560         unsigned                bandwidth;
 561
 562         /* This is used to initialize iTD's hw_bufp fields */
 563         __hc32                  buf0;
 564         __hc32                  buf1;
 565         __hc32                  buf2;
 566
 567         /* this is used to initialize sITD's tt info */
 568         __hc32                  address;
 569 };
 570
 571 /*-------------------------------------------------------------------------*/
 572
 573 /*
 574  * EHCI Specification 0.95 Section 3.3
 575  * Fig 3-4 "Isochronous Transaction Descriptor (iTD)"
 576  *
 577  * Schedule records for high speed iso xfers
 578  */
 579 struct ehci_itd {
 580         /* first part defined by EHCI spec */
 581         __hc32                  hw_next;           /* see EHCI 3.3.1 */
 582         __hc32                  hw_transaction [8]; /* see EHCI 3.3.2 */
 583 #define EHCI_ISOC_ACTIVE        (1<<31)        /* activate transfer this slot */
 584 #define EHCI_ISOC_BUF_ERR       (1<<30)        /* Data buffer error */
 585 #define EHCI_ISOC_BABBLE        (1<<29)        /* babble detected */
 586 #define EHCI_ISOC_XACTERR       (1<<28)        /* XactErr - transaction error */
 587 #define EHCI_ITD_LENGTH(tok)    (((tok)>>16) & 0x0fff)
 588 #define EHCI_ITD_IOC            (1 << 15)       /* interrupt on complete */
 589
 590 #define ITD_ACTIVE(ehci)        cpu_to_hc32(ehci, EHCI_ISOC_ACTIVE)
 591
 592         __hc32                  hw_bufp [7];    /* see EHCI 3.3.3 */
 593         __hc32                  hw_bufp_hi [7]; /* Appendix B */
 594
 595         /* the rest is HCD-private */
 596         dma_addr_t              itd_dma;        /* for this itd */
 597         union ehci_shadow       itd_next;       /* ptr to periodic q entry */
 598
 599         struct urb              *urb;
 600         struct ehci_iso_stream  *stream;        /* endpoint's queue */
 601         struct list_head        itd_list;       /* list of stream's itds */
 602
 603         /* any/all hw_transactions here may be used by that urb */
 604         unsigned                frame;          /* where scheduled */
 605         unsigned                pg;
 606         unsigned                index[8];       /* in urb->iso_frame_desc */
 607 } __attribute__ ((aligned (32)));
 608
 609 /*-------------------------------------------------------------------------*/
 610
 611 /*
 612  * EHCI Specification 0.95 Section 3.4
 613  * siTD, aka split-transaction isochronous Transfer Descriptor
 614  *       ... describe full speed iso xfers through TT in hubs
 615  * see Figure 3-5 "Split-transaction Isochronous Transaction Descriptor (siTD)
 616  */
 617 struct ehci_sitd {
 618         /* first part defined by EHCI spec */
 619         __hc32                  hw_next;
 620 /* uses bit field macros above - see EHCI 0.95 Table 3-8 */
 621         __hc32                  hw_fullspeed_ep;        /* EHCI table 3-9 */
 622         __hc32                  hw_uframe;              /* EHCI table 3-10 */
 623         __hc32                  hw_results;             /* EHCI table 3-11 */
 624 #define SITD_IOC        (1 << 31)       /* interrupt on completion */
 625 #define SITD_PAGE       (1 << 30)       /* buffer 0/1 */
 626 #define SITD_LENGTH(x)  (0x3ff & ((x)>>16))
 627 #define SITD_STS_ACTIVE (1 << 7)        /* HC may execute this */
 628 #define SITD_STS_ERR    (1 << 6)        /* error from TT */
 629 #define SITD_STS_DBE    (1 << 5)        /* data buffer error (in HC) */
 630 #define SITD_STS_BABBLE (1 << 4)        /* device was babbling */
 631 #define SITD_STS_XACT   (1 << 3)        /* illegal IN response */
 632 #define SITD_STS_MMF    (1 << 2)        /* incomplete split transaction */
 633 #define SITD_STS_STS    (1 << 1)        /* split transaction state */
 634
 635 #define SITD_ACTIVE(ehci)       cpu_to_hc32(ehci, SITD_STS_ACTIVE)
 636
 637         __hc32                  hw_buf [2];             /* EHCI table 3-12 */
 638         __hc32                  hw_backpointer;         /* EHCI table 3-13 */
 639         __hc32                  hw_buf_hi [2];          /* Appendix B */
 640
 641         /* the rest is HCD-private */
 642         dma_addr_t              sitd_dma;
 643         union ehci_shadow       sitd_next;      /* ptr to periodic q entry */
 644
 645         struct urb              *urb;
 646         struct ehci_iso_stream  *stream;        /* endpoint's queue */
 647         struct list_head        sitd_list;      /* list of stream's sitds */
 648         unsigned                frame;
 649         unsigned                index;
 650 } __attribute__ ((aligned (32)));
 651
 652 /*-------------------------------------------------------------------------*/
 653
 654 /*
 655  * EHCI Specification 0.96 Section 3.7
 656  * Periodic Frame Span Traversal Node (FSTN)
 657  *
 658  * Manages split interrupt transactions (using TT) that span frame boundaries
 659  * into uframes 0/1; see 4.12.2.2.  In those uframes, a "save place" FSTN
 660  * makes the HC jump (back) to a QH to scan for fs/ls QH completions until
 661  * it hits a "restore" FSTN; then it returns to finish other uframe 0/1 work.
 662  */
 663 struct ehci_fstn {
 664         __hc32                  hw_next;        /* any periodic q entry */
 665         __hc32                  hw_prev;        /* qh or EHCI_LIST_END */
 666
 667         /* the rest is HCD-private */
 668         dma_addr_t              fstn_dma;
 669         union ehci_shadow       fstn_next;      /* ptr to periodic q entry */
 670 } __attribute__ ((aligned (32)));
 671
 672 /*-------------------------------------------------------------------------*/
 673
 674 #ifdef CONFIG_USB_EHCI_ROOT_HUB_TT
 675
 676 /*
 677  * Some EHCI controllers have a Transaction Translator built into the
 678  * root hub. This is a non-standard feature.  Each controller will need
 679  * to add code to the following inline functions, and call them as
 680  * needed (mostly in root hub code).
 681  */
 682
 683 #define ehci_is_TDI(e)                  (ehci_to_hcd(e)->has_tt)
 684
 685 /* Returns the speed of a device attached to a port on the root hub. */
 686 static inline unsigned int
 687 ehci_port_speed(struct ehci_hcd *ehci, unsigned int portsc)
 688 {
 689         if (ehci_is_TDI(ehci)) {
 690                 switch ((portsc>>26)&3) {
 691                 case 0:
 692                         return 0;
 693                 case 1:
 694                         return (1<<USB_PORT_FEAT_LOWSPEED);
 695                 case 2:
 696                 default:
 697                         return (1<<USB_PORT_FEAT_HIGHSPEED);
 698                 }
 699         }
 700         return (1<<USB_PORT_FEAT_HIGHSPEED);
 701 }
 702
 703 #else
 704
 705 #define ehci_is_TDI(e)                  (0)
 706
 707 #define ehci_port_speed(ehci, portsc)   (1<<USB_PORT_FEAT_HIGHSPEED)
 708 #endif
 709
 710 /*-------------------------------------------------------------------------*/
 711
 712 #ifdef CONFIG_PPC_83xx
 713 /* Some Freescale processors have an erratum in which the TT
 714  * port number in the queue head was 0..N-1 instead of 1..N.
 715  */
 716 #define ehci_has_fsl_portno_bug(e)              ((e)->has_fsl_port_bug)
 717 #else
 718 #define ehci_has_fsl_portno_bug(e)              (0)
 719 #endif
 720
 721 /*
 722  * While most USB host controllers implement their registers in
 723  * little-endian format, a minority (celleb companion chip) implement
 724  * them in big endian format.
 725  *
 726  * This attempts to support either format at compile time without a
 727  * runtime penalty, or both formats with the additional overhead
 728  * of checking a flag bit.
 729  */
 730
 731 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 732 #define ehci_big_endian_mmio(e)         ((e)->big_endian_mmio)
 733 #else
 734 #define ehci_big_endian_mmio(e)         0
 735 #endif
 736
 737 /*
 738  * Big-endian read/write functions are arch-specific.
 739  * Other arches can be added if/when they're needed.
 740  *
 741  * REVISIT: arch/powerpc now has readl/writel_be, so the
 742  * definition below can die once the 4xx support is
 743  * finally ported over.
 744  */
 745 #if defined(CONFIG_PPC) && !defined(CONFIG_PPC_MERGE)
 746 #define readl_be(addr)          in_be32((__force unsigned *)addr)
 747 #define writel_be(val, addr)    out_be32((__force unsigned *)addr, val)
 748 #endif
 749
 750 #if defined(CONFIG_ARM) && defined(CONFIG_ARCH_IXP4XX)
 751 #define readl_be(addr)          __raw_readl((__force unsigned *)addr)
 752 #define writel_be(val, addr)    __raw_writel(val, (__force unsigned *)addr)
 753 #endif
 754
 755 static inline unsigned int ehci_readl(const struct ehci_hcd *ehci,
 756                 __u32 __iomem * regs)
 757 {
 758 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 759         return ehci_big_endian_mmio(ehci) ?
 760                 readl_be(regs) :
 761                 readl(regs);
 762 #else
 763         return readl(regs);
 764 #endif
 765 }
 766
 767 static inline void ehci_writel(const struct ehci_hcd *ehci,
 768                 const unsigned int val, __u32 __iomem *regs)
 769 {
 770 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 771         ehci_big_endian_mmio(ehci) ?
 772                 writel_be(val, regs) :
 773                 writel(val, regs);
 774 #else
 775         writel(val, regs);
 776 #endif
 777 }
 778
 779 /*-------------------------------------------------------------------------*/
 780
 781 /*
 782  * The AMCC 440EPx not only implements its EHCI registers in big-endian
 783  * format, but also its DMA data structures (descriptors).
 784  *
 785  * EHCI controllers accessed through PCI work normally (little-endian
 786  * everywhere), so we won't bother supporting a BE-only mode for now.
 787  */
 788 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
 789 #define ehci_big_endian_desc(e)         ((e)->big_endian_desc)
 790
 791 /* cpu to ehci */
 792 static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x)
 793 {
 794         return ehci_big_endian_desc(ehci)
 795                 ? (__force __hc32)cpu_to_be32(x)
 796                 : (__force __hc32)cpu_to_le32(x);
 797 }
 798
 799 /* ehci to cpu */
 800 static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x)
 801 {
 802         return ehci_big_endian_desc(ehci)
 803                 ? be32_to_cpu((__force __be32)x)
 804                 : le32_to_cpu((__force __le32)x);
 805 }
 806
 807 static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
 808 {
 809         return ehci_big_endian_desc(ehci)
 810                 ? be32_to_cpup((__force __be32 *)x)
 811                 : le32_to_cpup((__force __le32 *)x);
 812 }
 813
 814 #else
 815
 816 /* cpu to ehci */
 817 static inline __hc32 cpu_to_hc32 (const struct ehci_hcd *ehci, const u32 x)
 818 {
 819         return cpu_to_le32(x);
 820 }
 821
 822 /* ehci to cpu */
 823 static inline u32 hc32_to_cpu (const struct ehci_hcd *ehci, const __hc32 x)
 824 {
 825         return le32_to_cpu(x);
 826 }
 827
 828 static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
 829 {
 830         return le32_to_cpup(x);
 831 }
 832
 833 #endif
 834
 835 /*-------------------------------------------------------------------------*/
 836
 837 #ifndef DEBUG
 838 #define STUB_DEBUG_FILES
 839 #endif  /* DEBUG */
 840
 841 /*-------------------------------------------------------------------------*/
 842
 843 #endif /* __LINUX_EHCI_HCD_H */