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