drivers/usb/host/ohci.h

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
   6  *
   7  * This file is licenced under the GPL.
   8  */
   9
  10 /*
  11  * __hc32 and __hc16 are "Host Controller" types, they may be equivalent to
  12  * __leXX (normally) or __beXX (given OHCI_BIG_ENDIAN), depending on the
  13  * host controller implementation.
  14  */
  15 typedef __u32 __bitwise __hc32;
  16 typedef __u16 __bitwise __hc16;
  17
  18 /*
  19  * OHCI Endpoint Descriptor (ED) ... holds TD queue
  20  * See OHCI spec, section 4.2
  21  *
  22  * This is a "Queue Head" for those transfers, which is why
  23  * both EHCI and UHCI call similar structures a "QH".
  24  */
  25 struct ed {
  26         /* first fields are hardware-specified */
  27         __hc32                  hwINFO;         /* endpoint config bitmap */
  28         /* info bits defined by hcd */
  29 #define ED_DEQUEUE      (1 << 27)
  30         /* info bits defined by the hardware */
  31 #define ED_ISO          (1 << 15)
  32 #define ED_SKIP         (1 << 14)
  33 #define ED_LOWSPEED     (1 << 13)
  34 #define ED_OUT          (0x01 << 11)
  35 #define ED_IN           (0x02 << 11)
  36         __hc32                  hwTailP;        /* tail of TD list */
  37         __hc32                  hwHeadP;        /* head of TD list (hc r/w) */
  38 #define ED_C            (0x02)                  /* toggle carry */
  39 #define ED_H            (0x01)                  /* halted */
  40         __hc32                  hwNextED;       /* next ED in list */
  41
  42         /* rest are purely for the driver's use */
  43         dma_addr_t              dma;            /* addr of ED */
  44         struct td               *dummy;         /* next TD to activate */
  45
  46         /* host's view of schedule */
  47         struct ed               *ed_next;       /* on schedule or rm_list */
  48         struct ed               *ed_prev;       /* for non-interrupt EDs */
  49         struct list_head        td_list;        /* "shadow list" of our TDs */
  50
  51         /* create --> IDLE --> OPER --> ... --> IDLE --> destroy
  52          * usually:  OPER --> UNLINK --> (IDLE | OPER) --> ...
  53          */
  54         u8                      state;          /* ED_{IDLE,UNLINK,OPER} */
  55 #define ED_IDLE         0x00            /* NOT linked to HC */
  56 #define ED_UNLINK       0x01            /* being unlinked from hc */
  57 #define ED_OPER         0x02            /* IS linked to hc */
  58
  59         u8                      type;           /* PIPE_{BULK,...} */
  60
  61         /* periodic scheduling params (for intr and iso) */
  62         u8                      branch;
  63         u16                     interval;
  64         u16                     load;
  65         u16                     last_iso;       /* iso only */
  66
  67         /* HC may see EDs on rm_list until next frame (frame_no == tick) */
  68         u16                     tick;
  69 } __attribute__ ((aligned(16)));
  70
  71 #define ED_MASK ((u32)~0x0f)            /* strip hw status in low addr bits */
  72
  73
  74 /*
  75  * OHCI Transfer Descriptor (TD) ... one per transfer segment
  76  * See OHCI spec, sections 4.3.1 (general = control/bulk/interrupt)
  77  * and 4.3.2 (iso)
  78  */
  79 struct td {
  80         /* first fields are hardware-specified */
  81         __hc32          hwINFO;         /* transfer info bitmask */
  82
  83         /* hwINFO bits for both general and iso tds: */
  84 #define TD_CC       0xf0000000                  /* condition code */
  85 #define TD_CC_GET(td_p) ((td_p >>28) & 0x0f)
  86 //#define TD_CC_SET(td_p, cc) (td_p) = ((td_p) & 0x0fffffff) | (((cc) & 0x0f) << 28)
  87 #define TD_DI       0x00E00000                  /* frames before interrupt */
  88 #define TD_DI_SET(X) (((X) & 0x07)<< 21)
  89         /* these two bits are available for definition/use by HCDs in both
  90          * general and iso tds ... others are available for only one type
  91          */
  92 #define TD_DONE     0x00020000                  /* retired to donelist */
  93 #define TD_ISO      0x00010000                  /* copy of ED_ISO */
  94
  95         /* hwINFO bits for general tds: */
  96 #define TD_EC       0x0C000000                  /* error count */
  97 #define TD_T        0x03000000                  /* data toggle state */
  98 #define TD_T_DATA0  0x02000000                          /* DATA0 */
  99 #define TD_T_DATA1  0x03000000                          /* DATA1 */
 100 #define TD_T_TOGGLE 0x00000000                          /* uses ED_C */
 101 #define TD_DP       0x00180000                  /* direction/pid */
 102 #define TD_DP_SETUP 0x00000000                  /* SETUP pid */
 103 #define TD_DP_IN    0x00100000                          /* IN pid */
 104 #define TD_DP_OUT   0x00080000                          /* OUT pid */
 105                                                         /* 0x00180000 rsvd */
 106 #define TD_R        0x00040000                  /* round: short packets OK? */
 107
 108         /* (no hwINFO #defines yet for iso tds) */
 109
 110         __hc32          hwCBP;          /* Current Buffer Pointer (or 0) */
 111         __hc32          hwNextTD;       /* Next TD Pointer */
 112         __hc32          hwBE;           /* Memory Buffer End Pointer */
 113
 114         /* PSW is only for ISO.  Only 1 PSW entry is used, but on
 115          * big-endian PPC hardware that's the second entry.
 116          */
 117 #define MAXPSW  2
 118         __hc16          hwPSW [MAXPSW];
 119
 120         /* rest are purely for the driver's use */
 121         __u8            index;
 122         struct ed       *ed;
 123         struct td       *td_hash;       /* dma-->td hashtable */
 124         struct td       *next_dl_td;
 125         struct urb      *urb;
 126
 127         dma_addr_t      td_dma;         /* addr of this TD */
 128         dma_addr_t      data_dma;       /* addr of data it points to */
 129
 130         struct list_head td_list;       /* "shadow list", TDs on same ED */
 131 } __attribute__ ((aligned(32)));        /* c/b/i need 16; only iso needs 32 */
 132
 133 #define TD_MASK ((u32)~0x1f)            /* strip hw status in low addr bits */
 134
 135 /*
 136  * Hardware transfer status codes -- CC from td->hwINFO or td->hwPSW
 137  */
 138 #define TD_CC_NOERROR      0x00
 139 #define TD_CC_CRC          0x01
 140 #define TD_CC_BITSTUFFING  0x02
 141 #define TD_CC_DATATOGGLEM  0x03
 142 #define TD_CC_STALL        0x04
 143 #define TD_DEVNOTRESP      0x05
 144 #define TD_PIDCHECKFAIL    0x06
 145 #define TD_UNEXPECTEDPID   0x07
 146 #define TD_DATAOVERRUN     0x08
 147 #define TD_DATAUNDERRUN    0x09
 148     /* 0x0A, 0x0B reserved for hardware */
 149 #define TD_BUFFEROVERRUN   0x0C
 150 #define TD_BUFFERUNDERRUN  0x0D
 151     /* 0x0E, 0x0F reserved for HCD */
 152 #define TD_NOTACCESSED     0x0F
 153
 154
 155 /* map OHCI TD status codes (CC) to errno values */
 156 static const int cc_to_error [16] = {
 157         /* No  Error  */               0,
 158         /* CRC Error  */               -EILSEQ,
 159         /* Bit Stuff  */               -EPROTO,
 160         /* Data Togg  */               -EILSEQ,
 161         /* Stall      */               -EPIPE,
 162         /* DevNotResp */               -ETIMEDOUT,
 163         /* PIDCheck   */               -EPROTO,
 164         /* UnExpPID   */               -EPROTO,
 165         /* DataOver   */               -EOVERFLOW,
 166         /* DataUnder  */               -EREMOTEIO,
 167         /* (for hw)   */               -EIO,
 168         /* (for hw)   */               -EIO,
 169         /* BufferOver */               -ECOMM,
 170         /* BuffUnder  */               -ENOSR,
 171         /* (for HCD)  */               -EALREADY,
 172         /* (for HCD)  */               -EALREADY
 173 };
 174
 175
 176 /*
 177  * The HCCA (Host Controller Communications Area) is a 256 byte
 178  * structure defined section 4.4.1 of the OHCI spec. The HC is
 179  * told the base address of it.  It must be 256-byte aligned.
 180  */
 181 struct ohci_hcca {
 182 #define NUM_INTS 32
 183         __hc32  int_table [NUM_INTS];   /* periodic schedule */
 184
 185         /*
 186          * OHCI defines u16 frame_no, followed by u16 zero pad.
 187          * Since some processors can't do 16 bit bus accesses,
 188          * portable access must be a 32 bits wide.
 189          */
 190         __hc32  frame_no;               /* current frame number */
 191         __hc32  done_head;              /* info returned for an interrupt */
 192         u8      reserved_for_hc [116];
 193         u8      what [4];               /* spec only identifies 252 bytes :) */
 194 } __attribute__ ((aligned(256)));
 195
 196 /*
 197  * This is the structure of the OHCI controller's memory mapped I/O region.
 198  * You must use readl() and writel() (in <asm/io.h>) to access these fields!!
 199  * Layout is in section 7 (and appendix B) of the spec.
 200  */
 201 struct ohci_regs {
 202         /* control and status registers (section 7.1) */
 203         __hc32  revision;
 204         __hc32  control;
 205         __hc32  cmdstatus;
 206         __hc32  intrstatus;
 207         __hc32  intrenable;
 208         __hc32  intrdisable;
 209
 210         /* memory pointers (section 7.2) */
 211         __hc32  hcca;
 212         __hc32  ed_periodcurrent;
 213         __hc32  ed_controlhead;
 214         __hc32  ed_controlcurrent;
 215         __hc32  ed_bulkhead;
 216         __hc32  ed_bulkcurrent;
 217         __hc32  donehead;
 218
 219         /* frame counters (section 7.3) */
 220         __hc32  fminterval;
 221         __hc32  fmremaining;
 222         __hc32  fmnumber;
 223         __hc32  periodicstart;
 224         __hc32  lsthresh;
 225
 226         /* Root hub ports (section 7.4) */
 227         struct  ohci_roothub_regs {
 228                 __hc32  a;
 229                 __hc32  b;
 230                 __hc32  status;
 231 #define MAX_ROOT_PORTS  15      /* maximum OHCI root hub ports (RH_A_NDP) */
 232                 __hc32  portstatus [MAX_ROOT_PORTS];
 233         } roothub;
 234
 235         /* and optional "legacy support" registers (appendix B) at 0x0100 */
 236
 237 } __attribute__ ((aligned(32)));
 238
 239
 240 /* OHCI CONTROL AND STATUS REGISTER MASKS */
 241
 242 /*
 243  * HcControl (control) register masks
 244  */
 245 #define OHCI_CTRL_CBSR  (3 << 0)        /* control/bulk service ratio */
 246 #define OHCI_CTRL_PLE   (1 << 2)        /* periodic list enable */
 247 #define OHCI_CTRL_IE    (1 << 3)        /* isochronous enable */
 248 #define OHCI_CTRL_CLE   (1 << 4)        /* control list enable */
 249 #define OHCI_CTRL_BLE   (1 << 5)        /* bulk list enable */
 250 #define OHCI_CTRL_HCFS  (3 << 6)        /* host controller functional state */
 251 #define OHCI_CTRL_IR    (1 << 8)        /* interrupt routing */
 252 #define OHCI_CTRL_RWC   (1 << 9)        /* remote wakeup connected */
 253 #define OHCI_CTRL_RWE   (1 << 10)       /* remote wakeup enable */
 254
 255 /* pre-shifted values for HCFS */
 256 #       define OHCI_USB_RESET   (0 << 6)
 257 #       define OHCI_USB_RESUME  (1 << 6)
 258 #       define OHCI_USB_OPER    (2 << 6)
 259 #       define OHCI_USB_SUSPEND (3 << 6)
 260
 261 /*
 262  * HcCommandStatus (cmdstatus) register masks
 263  */
 264 #define OHCI_HCR        (1 << 0)        /* host controller reset */
 265 #define OHCI_CLF        (1 << 1)        /* control list filled */
 266 #define OHCI_BLF        (1 << 2)        /* bulk list filled */
 267 #define OHCI_OCR        (1 << 3)        /* ownership change request */
 268 #define OHCI_SOC        (3 << 16)       /* scheduling overrun count */
 269
 270 /*
 271  * masks used with interrupt registers:
 272  * HcInterruptStatus (intrstatus)
 273  * HcInterruptEnable (intrenable)
 274  * HcInterruptDisable (intrdisable)
 275  */
 276 #define OHCI_INTR_SO    (1 << 0)        /* scheduling overrun */
 277 #define OHCI_INTR_WDH   (1 << 1)        /* writeback of done_head */
 278 #define OHCI_INTR_SF    (1 << 2)        /* start frame */
 279 #define OHCI_INTR_RD    (1 << 3)        /* resume detect */
 280 #define OHCI_INTR_UE    (1 << 4)        /* unrecoverable error */
 281 #define OHCI_INTR_FNO   (1 << 5)        /* frame number overflow */
 282 #define OHCI_INTR_RHSC  (1 << 6)        /* root hub status change */
 283 #define OHCI_INTR_OC    (1 << 30)       /* ownership change */
 284 #define OHCI_INTR_MIE   (1 << 31)       /* master interrupt enable */
 285
 286
 287 /* OHCI ROOT HUB REGISTER MASKS */
 288
 289 /* roothub.portstatus [i] bits */
 290 #define RH_PS_CCS            0x00000001         /* current connect status */
 291 #define RH_PS_PES            0x00000002         /* port enable status*/
 292 #define RH_PS_PSS            0x00000004         /* port suspend status */
 293 #define RH_PS_POCI           0x00000008         /* port over current indicator */
 294 #define RH_PS_PRS            0x00000010         /* port reset status */
 295 #define RH_PS_PPS            0x00000100         /* port power status */
 296 #define RH_PS_LSDA           0x00000200         /* low speed device attached */
 297 #define RH_PS_CSC            0x00010000         /* connect status change */
 298 #define RH_PS_PESC           0x00020000         /* port enable status change */
 299 #define RH_PS_PSSC           0x00040000         /* port suspend status change */
 300 #define RH_PS_OCIC           0x00080000         /* over current indicator change */
 301 #define RH_PS_PRSC           0x00100000         /* port reset status change */
 302
 303 /* roothub.status bits */
 304 #define RH_HS_LPS            0x00000001         /* local power status */
 305 #define RH_HS_OCI            0x00000002         /* over current indicator */
 306 #define RH_HS_DRWE           0x00008000         /* device remote wakeup enable */
 307 #define RH_HS_LPSC           0x00010000         /* local power status change */
 308 #define RH_HS_OCIC           0x00020000         /* over current indicator change */
 309 #define RH_HS_CRWE           0x80000000         /* clear remote wakeup enable */
 310
 311 /* roothub.b masks */
 312 #define RH_B_DR         0x0000ffff              /* device removable flags */
 313 #define RH_B_PPCM       0xffff0000              /* port power control mask */
 314
 315 /* roothub.a masks */
 316 #define RH_A_NDP        (0xff << 0)             /* number of downstream ports */
 317 #define RH_A_PSM        (1 << 8)                /* power switching mode */
 318 #define RH_A_NPS        (1 << 9)                /* no power switching */
 319 #define RH_A_DT         (1 << 10)               /* device type (mbz) */
 320 #define RH_A_OCPM       (1 << 11)               /* over current protection mode */
 321 #define RH_A_NOCP       (1 << 12)               /* no over current protection */
 322 #define RH_A_POTPGT     (0xff << 24)            /* power on to power good time */
 323
 324
 325 /* hcd-private per-urb state */
 326 typedef struct urb_priv {
 327         struct ed               *ed;
 328         u16                     length;         // # tds in this request
 329         u16                     td_cnt;         // tds already serviced
 330         struct list_head        pending;
 331         struct td               *td [0];        // all TDs in this request
 332
 333 } urb_priv_t;
 334
 335 #define TD_HASH_SIZE    64    /* power'o'two */
 336 // sizeof (struct td) ~= 64 == 2^6 ...
 337 #define TD_HASH_FUNC(td_dma) ((td_dma ^ (td_dma >> 6)) % TD_HASH_SIZE)
 338
 339
 340 /*
 341  * This is the full ohci controller description
 342  *
 343  * Note how the "proper" USB information is just
 344  * a subset of what the full implementation needs. (Linus)
 345  */
 346
 347 struct ohci_hcd {
 348         spinlock_t              lock;
 349
 350         /*
 351          * I/O memory used to communicate with the HC (dma-consistent)
 352          */
 353         struct ohci_regs __iomem *regs;
 354
 355         /*
 356          * main memory used to communicate with the HC (dma-consistent).
 357          * hcd adds to schedule for a live hc any time, but removals finish
 358          * only at the start of the next frame.
 359          */
 360         struct ohci_hcca        *hcca;
 361         dma_addr_t              hcca_dma;
 362
 363         struct ed               *ed_rm_list;            /* to be removed */
 364
 365         struct ed               *ed_bulktail;           /* last in bulk list */
 366         struct ed               *ed_controltail;        /* last in ctrl list */
 367         struct ed               *periodic [NUM_INTS];   /* shadow int_table */
 368
 369         /*
 370          * OTG controllers and transceivers need software interaction;
 371          * other external transceivers should be software-transparent
 372          */
 373         struct otg_transceiver  *transceiver;
 374         unsigned                power_budget;
 375
 376         /*
 377          * memory management for queue data structures
 378          */
 379         struct dma_pool         *td_cache;
 380         struct dma_pool         *ed_cache;
 381         struct td               *td_hash [TD_HASH_SIZE];
 382         struct list_head        pending;
 383
 384         /*
 385          * driver state
 386          */
 387         int                     load [NUM_INTS];
 388         u32                     hc_control;     /* copy of hc control reg */
 389         unsigned long           next_statechange;       /* suspend/resume */
 390         u32                     fminterval;             /* saved register */
 391
 392         struct work_struct      rh_resume;
 393
 394         unsigned long           flags;          /* for HC bugs */
 395 #define OHCI_QUIRK_AMD756       0x01                    /* erratum #4 */
 396 #define OHCI_QUIRK_SUPERIO      0x02                    /* natsemi */
 397 #define OHCI_QUIRK_INITRESET    0x04                    /* SiS, OPTi, ... */
 398 #define OHCI_BIG_ENDIAN         0x08                    /* big endian HC */
 399         // there are also chip quirks/bugs in init logic
 400
 401 };
 402
 403 /* convert between an hcd pointer and the corresponding ohci_hcd */
 404 static inline struct ohci_hcd *hcd_to_ohci (struct usb_hcd *hcd)
 405 {
 406         return (struct ohci_hcd *) (hcd->hcd_priv);
 407 }
 408 static inline struct usb_hcd *ohci_to_hcd (const struct ohci_hcd *ohci)
 409 {
 410         return container_of ((void *) ohci, struct usb_hcd, hcd_priv);
 411 }
 412
 413 /*-------------------------------------------------------------------------*/
 414
 415 #ifndef DEBUG
 416 #define STUB_DEBUG_FILES
 417 #endif  /* DEBUG */
 418
 419 #define ohci_dbg(ohci, fmt, args...) \
 420         dev_dbg (ohci_to_hcd(ohci)->self.controller , fmt , ## args )
 421 #define ohci_err(ohci, fmt, args...) \
 422         dev_err (ohci_to_hcd(ohci)->self.controller , fmt , ## args )
 423 #define ohci_info(ohci, fmt, args...) \
 424         dev_info (ohci_to_hcd(ohci)->self.controller , fmt , ## args )
 425 #define ohci_warn(ohci, fmt, args...) \
 426         dev_warn (ohci_to_hcd(ohci)->self.controller , fmt , ## args )
 427
 428 #ifdef OHCI_VERBOSE_DEBUG
 429 #       define ohci_vdbg ohci_dbg
 430 #else
 431 #       define ohci_vdbg(ohci, fmt, args...) do { } while (0)
 432 #endif
 433
 434 /*-------------------------------------------------------------------------*/
 435
 436 /*
 437  * While most USB host controllers implement their registers and
 438  * in-memory communication descriptors in little-endian format,
 439  * a minority (notably the IBM STB04XXX and the Motorola MPC5200
 440  * processors) implement them in big endian format.
 441  *
 442  * This attempts to support either format at compile time without a
 443  * runtime penalty, or both formats with the additional overhead
 444  * of checking a flag bit.
 445  */
 446
 447 #ifdef CONFIG_USB_OHCI_BIG_ENDIAN
 448
 449 #ifdef CONFIG_USB_OHCI_LITTLE_ENDIAN
 450 #define big_endian(ohci)        (ohci->flags & OHCI_BIG_ENDIAN) /* either */
 451 #else
 452 #define big_endian(ohci)        1               /* only big endian */
 453 #endif
 454
 455 /*
 456  * Big-endian read/write functions are arch-specific.
 457  * Other arches can be added if/when they're needed.
 458  */
 459 #if defined(CONFIG_PPC)
 460 #define readl_be(addr)          in_be32((__force unsigned *)addr)
 461 #define writel_be(val, addr)    out_be32((__force unsigned *)addr, val)
 462 #endif
 463
 464 static inline unsigned int ohci_readl (const struct ohci_hcd *ohci,
 465                                                         __hc32 __iomem * regs)
 466 {
 467         return big_endian(ohci) ? readl_be (regs) : readl ((__force u32 *)regs);
 468 }
 469
 470 static inline void ohci_writel (const struct ohci_hcd *ohci,
 471                                 const unsigned int val, __hc32 __iomem *regs)
 472 {
 473         big_endian(ohci) ? writel_be (val, regs) :
 474                            writel (val, (__force u32 *)regs);
 475 }
 476
 477 #else   /* !CONFIG_USB_OHCI_BIG_ENDIAN */
 478
 479 #define big_endian(ohci)        0               /* only little endian */
 480
 481 #ifdef CONFIG_ARCH_LH7A404
 482         /* Marc Singer: at the time this code was written, the LH7A404
 483          * had a problem reading the USB host registers.  This
 484          * implementation of the ohci_readl function performs the read
 485          * twice as a work-around.
 486          */
 487 static inline unsigned int
 488 ohci_readl (const struct ohci_hcd *ohci, const __hc32 *regs)
 489 {
 490         *(volatile __force unsigned int*) regs;
 491         return *(volatile __force unsigned int*) regs;
 492 }
 493 #else
 494         /* Standard version of ohci_readl uses standard, platform
 495          * specific implementation. */
 496 static inline unsigned int
 497 ohci_readl (const struct ohci_hcd *ohci, __hc32 __iomem * regs)
 498 {
 499         return readl(regs);
 500 }
 501 #endif
 502
 503 static inline void ohci_writel (const struct ohci_hcd *ohci,
 504                                 const unsigned int val, __hc32 __iomem *regs)
 505 {
 506         writel (val, regs);
 507 }
 508
 509 #endif  /* !CONFIG_USB_OHCI_BIG_ENDIAN */
 510
 511 /*-------------------------------------------------------------------------*/
 512
 513 /* cpu to ohci */
 514 static inline __hc16 cpu_to_hc16 (const struct ohci_hcd *ohci, const u16 x)
 515 {
 516         return big_endian(ohci) ? (__force __hc16)cpu_to_be16(x) : (__force __hc16)cpu_to_le16(x);
 517 }
 518
 519 static inline __hc16 cpu_to_hc16p (const struct ohci_hcd *ohci, const u16 *x)
 520 {
 521         return big_endian(ohci) ? cpu_to_be16p(x) : cpu_to_le16p(x);
 522 }
 523
 524 static inline __hc32 cpu_to_hc32 (const struct ohci_hcd *ohci, const u32 x)
 525 {
 526         return big_endian(ohci) ? (__force __hc32)cpu_to_be32(x) : (__force __hc32)cpu_to_le32(x);
 527 }
 528
 529 static inline __hc32 cpu_to_hc32p (const struct ohci_hcd *ohci, const u32 *x)
 530 {
 531         return big_endian(ohci) ? cpu_to_be32p(x) : cpu_to_le32p(x);
 532 }
 533
 534 /* ohci to cpu */
 535 static inline u16 hc16_to_cpu (const struct ohci_hcd *ohci, const __hc16 x)
 536 {
 537         return big_endian(ohci) ? be16_to_cpu((__force __be16)x) : le16_to_cpu((__force __le16)x);
 538 }
 539
 540 static inline u16 hc16_to_cpup (const struct ohci_hcd *ohci, const __hc16 *x)
 541 {
 542         return big_endian(ohci) ? be16_to_cpup((__force __be16 *)x) : le16_to_cpup((__force __le16 *)x);
 543 }
 544
 545 static inline u32 hc32_to_cpu (const struct ohci_hcd *ohci, const __hc32 x)
 546 {
 547         return big_endian(ohci) ? be32_to_cpu((__force __be32)x) : le32_to_cpu((__force __le32)x);
 548 }
 549
 550 static inline u32 hc32_to_cpup (const struct ohci_hcd *ohci, const __hc32 *x)
 551 {
 552         return big_endian(ohci) ? be32_to_cpup((__force __be32 *)x) : le32_to_cpup((__force __le32 *)x);
 553 }
 554
 555 /*-------------------------------------------------------------------------*/
 556
 557 /* HCCA frame number is 16 bits, but is accessed as 32 bits since not all
 558  * hardware handles 16 bit reads.  That creates a different confusion on
 559  * some big-endian SOC implementations.  Same thing happens with PSW access.
 560  */
 561
 562 #ifdef CONFIG_STB03xxx
 563 #define OHCI_BE_FRAME_NO_SHIFT  16
 564 #else
 565 #define OHCI_BE_FRAME_NO_SHIFT  0
 566 #endif
 567
 568 static inline u16 ohci_frame_no(const struct ohci_hcd *ohci)
 569 {
 570         u32 tmp;
 571         if (big_endian(ohci)) {
 572                 tmp = be32_to_cpup((__force __be32 *)&ohci->hcca->frame_no);
 573                 tmp >>= OHCI_BE_FRAME_NO_SHIFT;
 574         } else
 575                 tmp = le32_to_cpup((__force __le32 *)&ohci->hcca->frame_no);
 576
 577         return (u16)tmp;
 578 }
 579
 580 static inline __hc16 *ohci_hwPSWp(const struct ohci_hcd *ohci,
 581                                  const struct td *td, int index)
 582 {
 583         return (__hc16 *)(big_endian(ohci) ?
 584                         &td->hwPSW[index ^ 1] : &td->hwPSW[index]);
 585 }
 586
 587 static inline u16 ohci_hwPSW(const struct ohci_hcd *ohci,
 588                                const struct td *td, int index)
 589 {
 590         return hc16_to_cpup(ohci, ohci_hwPSWp(ohci, td, index));
 591 }
 592
 593 /*-------------------------------------------------------------------------*/
 594
 595 static inline void disable (struct ohci_hcd *ohci)
 596 {
 597         ohci_to_hcd(ohci)->state = HC_STATE_HALT;
 598 }
 599
 600 #define FI                      0x2edf          /* 12000 bits per frame (-1) */
 601 #define FSMP(fi)                (0x7fff & ((6 * ((fi) - 210)) / 7))
 602 #define FIT                     (1 << 31)
 603 #define LSTHRESH                0x628           /* lowspeed bit threshold */
 604
 605 static void periodic_reinit (struct ohci_hcd *ohci)
 606 {
 607         u32     fi = ohci->fminterval & 0x03fff;
 608         u32     fit = ohci_readl(ohci, &ohci->regs->fminterval) & FIT;
 609
 610         ohci_writel (ohci, (fit ^ FIT) | ohci->fminterval,
 611                                                 &ohci->regs->fminterval);
 612         ohci_writel (ohci, ((9 * fi) / 10) & 0x3fff,
 613                                                 &ohci->regs->periodicstart);
 614 }
 615
 616 /* AMD-756 (D2 rev) reports corrupt register contents in some cases.
 617  * The erratum (#4) description is incorrect.  AMD's workaround waits
 618  * till some bits (mostly reserved) are clear; ok for all revs.
 619  */
 620 #define read_roothub(hc, register, mask) ({ \
 621         u32 temp = ohci_readl (hc, &hc->regs->roothub.register); \
 622         if (temp == -1) \
 623                 disable (hc); \
 624         else if (hc->flags & OHCI_QUIRK_AMD756) \
 625                 while (temp & mask) \
 626                         temp = ohci_readl (hc, &hc->regs->roothub.register); \
 627         temp; })
 628
 629 static u32 roothub_a (struct ohci_hcd *hc)
 630         { return read_roothub (hc, a, 0xfc0fe000); }
 631 static inline u32 roothub_b (struct ohci_hcd *hc)
 632         { return ohci_readl (hc, &hc->regs->roothub.b); }
 633 static inline u32 roothub_status (struct ohci_hcd *hc)
 634         { return ohci_readl (hc, &hc->regs->roothub.status); }
 635 static u32 roothub_portstatus (struct ohci_hcd *hc, int i)
 636         { return read_roothub (hc, portstatus [i], 0xffe0fce0); }