drivers/usb/musb/musb_core.h

   1 /*
   2  * MUSB OTG driver defines
   3  *
   4  * Copyright 2005 Mentor Graphics Corporation
   5  * Copyright (C) 2005-2006 by Texas Instruments
   6  * Copyright (C) 2006-2007 Nokia Corporation
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
  23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  25  * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  28  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  29  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  */
  34
  35 #ifndef __MUSB_CORE_H__
  36 #define __MUSB_CORE_H__
  37
  38 #include <linux/slab.h>
  39 #include <linux/list.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/errno.h>
  42 #include <linux/timer.h>
  43 #include <linux/device.h>
  44 #include <linux/usb/ch9.h>
  45 #include <linux/usb/gadget.h>
  46 #include <linux/usb.h>
  47 #include <linux/usb/otg.h>
  48 #include <linux/usb/musb.h>
  49
  50 struct musb;
  51 struct musb_hw_ep;
  52 struct musb_ep;
  53
  54 /* Helper defines for struct musb->hwvers */
  55 #define MUSB_HWVERS_MAJOR(x)    ((x >> 10) & 0x1f)
  56 #define MUSB_HWVERS_MINOR(x)    (x & 0x3ff)
  57 #define MUSB_HWVERS_RC          0x8000
  58 #define MUSB_HWVERS_1300        0x52C
  59 #define MUSB_HWVERS_1400        0x590
  60 #define MUSB_HWVERS_1800        0x720
  61 #define MUSB_HWVERS_1900        0x784
  62 #define MUSB_HWVERS_2000        0x800
  63
  64 #include "musb_debug.h"
  65 #include "musb_dma.h"
  66
  67 #include "musb_io.h"
  68 #include "musb_regs.h"
  69
  70 #include "musb_gadget.h"
  71 #include <linux/usb/hcd.h>
  72 #include "musb_host.h"
  73
  74 #define is_peripheral_enabled(musb)     ((musb)->board_mode != MUSB_HOST)
  75 #define is_host_enabled(musb)           ((musb)->board_mode != MUSB_PERIPHERAL)
  76 #define is_otg_enabled(musb)            ((musb)->board_mode == MUSB_OTG)
  77
  78 /* NOTE:  otg and peripheral-only state machines start at B_IDLE.
  79  * OTG or host-only go to A_IDLE when ID is sensed.
  80  */
  81 #define is_peripheral_active(m)         (!(m)->is_host)
  82 #define is_host_active(m)               ((m)->is_host)
  83
  84 #ifndef CONFIG_HAVE_CLK
  85 /* Dummy stub for clk framework */
  86 #define clk_get(dev, id)        NULL
  87 #define clk_put(clock)          do {} while (0)
  88 #define clk_enable(clock)       do {} while (0)
  89 #define clk_disable(clock)      do {} while (0)
  90 #endif
  91
  92 #ifdef CONFIG_PROC_FS
  93 #include <linux/fs.h>
  94 #define MUSB_CONFIG_PROC_FS
  95 #endif
  96
  97 /****************************** PERIPHERAL ROLE *****************************/
  98
  99 #define is_peripheral_capable() (1)
 100
 101 extern irqreturn_t musb_g_ep0_irq(struct musb *);
 102 extern void musb_g_tx(struct musb *, u8);
 103 extern void musb_g_rx(struct musb *, u8);
 104 extern void musb_g_reset(struct musb *);
 105 extern void musb_g_suspend(struct musb *);
 106 extern void musb_g_resume(struct musb *);
 107 extern void musb_g_wakeup(struct musb *);
 108 extern void musb_g_disconnect(struct musb *);
 109
 110 /****************************** HOST ROLE ***********************************/
 111
 112 #define is_host_capable()       (1)
 113
 114 extern irqreturn_t musb_h_ep0_irq(struct musb *);
 115 extern void musb_host_tx(struct musb *, u8);
 116 extern void musb_host_rx(struct musb *, u8);
 117
 118 /****************************** CONSTANTS ********************************/
 119
 120 #ifndef MUSB_C_NUM_EPS
 121 #define MUSB_C_NUM_EPS ((u8)16)
 122 #endif
 123
 124 #ifndef MUSB_MAX_END0_PACKET
 125 #define MUSB_MAX_END0_PACKET ((u16)MUSB_EP0_FIFOSIZE)
 126 #endif
 127
 128 /* host side ep0 states */
 129 enum musb_h_ep0_state {
 130         MUSB_EP0_IDLE,
 131         MUSB_EP0_START,                 /* expect ack of setup */
 132         MUSB_EP0_IN,                    /* expect IN DATA */
 133         MUSB_EP0_OUT,                   /* expect ack of OUT DATA */
 134         MUSB_EP0_STATUS,                /* expect ack of STATUS */
 135 } __attribute__ ((packed));
 136
 137 /* peripheral side ep0 states */
 138 enum musb_g_ep0_state {
 139         MUSB_EP0_STAGE_IDLE,            /* idle, waiting for SETUP */
 140         MUSB_EP0_STAGE_SETUP,           /* received SETUP */
 141         MUSB_EP0_STAGE_TX,              /* IN data */
 142         MUSB_EP0_STAGE_RX,              /* OUT data */
 143         MUSB_EP0_STAGE_STATUSIN,        /* (after OUT data) */
 144         MUSB_EP0_STAGE_STATUSOUT,       /* (after IN data) */
 145         MUSB_EP0_STAGE_ACKWAIT,         /* after zlp, before statusin */
 146 } __attribute__ ((packed));
 147
 148 /*
 149  * OTG protocol constants.  See USB OTG 1.3 spec,
 150  * sections 5.5 "Device Timings" and 6.6.5 "Timers".
 151  */
 152 #define OTG_TIME_A_WAIT_VRISE   100             /* msec (max) */
 153 #define OTG_TIME_A_WAIT_BCON    1100            /* min 1 second */
 154 #define OTG_TIME_A_AIDL_BDIS    200             /* min 200 msec */
 155 #define OTG_TIME_B_ASE0_BRST    100             /* min 3.125 ms */
 156
 157
 158 /*************************** REGISTER ACCESS ********************************/
 159
 160 /* Endpoint registers (other than dynfifo setup) can be accessed either
 161  * directly with the "flat" model, or after setting up an index register.
 162  */
 163
 164 #if defined(CONFIG_ARCH_DAVINCI) || defined(CONFIG_SOC_OMAP2430) \
 165                 || defined(CONFIG_SOC_OMAP3430) || defined(CONFIG_BLACKFIN) \
 166                 || defined(CONFIG_ARCH_OMAP4)
 167 /* REVISIT indexed access seemed to
 168  * misbehave (on DaVinci) for at least peripheral IN ...
 169  */
 170 #define MUSB_FLAT_REG
 171 #endif
 172
 173 /* TUSB mapping: "flat" plus ep0 special cases */
 174 #if defined(CONFIG_USB_MUSB_TUSB6010) || \
 175         defined(CONFIG_USB_MUSB_TUSB6010_MODULE)
 176 #define musb_ep_select(_mbase, _epnum) \
 177         musb_writeb((_mbase), MUSB_INDEX, (_epnum))
 178 #define MUSB_EP_OFFSET                  MUSB_TUSB_OFFSET
 179
 180 /* "flat" mapping: each endpoint has its own i/o address */
 181 #elif   defined(MUSB_FLAT_REG)
 182 #define musb_ep_select(_mbase, _epnum)  (((void)(_mbase)), ((void)(_epnum)))
 183 #define MUSB_EP_OFFSET                  MUSB_FLAT_OFFSET
 184
 185 /* "indexed" mapping: INDEX register controls register bank select */
 186 #else
 187 #define musb_ep_select(_mbase, _epnum) \
 188         musb_writeb((_mbase), MUSB_INDEX, (_epnum))
 189 #define MUSB_EP_OFFSET                  MUSB_INDEXED_OFFSET
 190 #endif
 191
 192 /****************************** FUNCTIONS ********************************/
 193
 194 #define MUSB_HST_MODE(_musb)\
 195         { (_musb)->is_host = true; }
 196 #define MUSB_DEV_MODE(_musb) \
 197         { (_musb)->is_host = false; }
 198
 199 #define test_devctl_hst_mode(_x) \
 200         (musb_readb((_x)->mregs, MUSB_DEVCTL)&MUSB_DEVCTL_HM)
 201
 202 #define MUSB_MODE(musb) ((musb)->is_host ? "Host" : "Peripheral")
 203
 204 /******************************** TYPES *************************************/
 205
 206 /**
 207  * struct musb_platform_ops - Operations passed to musb_core by HW glue layer
 208  * @init:       turns on clocks, sets up platform-specific registers, etc
 209  * @exit:       undoes @init
 210  * @set_mode:   forcefully changes operating mode
 211  * @try_ilde:   tries to idle the IP
 212  * @vbus_status: returns vbus status if possible
 213  * @set_vbus:   forces vbus status
 214  * @adjust_channel_params: pre check for standard dma channel_program func
 215  */
 216 struct musb_platform_ops {
 217         int     (*init)(struct musb *musb);
 218         int     (*exit)(struct musb *musb);
 219
 220         void    (*enable)(struct musb *musb);
 221         void    (*disable)(struct musb *musb);
 222
 223         int     (*set_mode)(struct musb *musb, u8 mode);
 224         void    (*try_idle)(struct musb *musb, unsigned long timeout);
 225
 226         int     (*vbus_status)(struct musb *musb);
 227         void    (*set_vbus)(struct musb *musb, int on);
 228
 229         int     (*adjust_channel_params)(struct dma_channel *channel,
 230                                 u16 packet_sz, u8 *mode,
 231                                 dma_addr_t *dma_addr, u32 *len);
 232 };
 233
 234 /*
 235  * struct musb_hw_ep - endpoint hardware (bidirectional)
 236  *
 237  * Ordered slightly for better cacheline locality.
 238  */
 239 struct musb_hw_ep {
 240         struct musb             *musb;
 241         void __iomem            *fifo;
 242         void __iomem            *regs;
 243
 244 #if defined(CONFIG_USB_MUSB_TUSB6010) || \
 245         defined(CONFIG_USB_MUSB_TUSB6010_MODULE)
 246         void __iomem            *conf;
 247 #endif
 248
 249         /* index in musb->endpoints[]  */
 250         u8                      epnum;
 251
 252         /* hardware configuration, possibly dynamic */
 253         bool                    is_shared_fifo;
 254         bool                    tx_double_buffered;
 255         bool                    rx_double_buffered;
 256         u16                     max_packet_sz_tx;
 257         u16                     max_packet_sz_rx;
 258
 259         struct dma_channel      *tx_channel;
 260         struct dma_channel      *rx_channel;
 261
 262 #if defined(CONFIG_USB_MUSB_TUSB6010) || \
 263         defined(CONFIG_USB_MUSB_TUSB6010_MODULE)
 264         /* TUSB has "asynchronous" and "synchronous" dma modes */
 265         dma_addr_t              fifo_async;
 266         dma_addr_t              fifo_sync;
 267         void __iomem            *fifo_sync_va;
 268 #endif
 269
 270         void __iomem            *target_regs;
 271
 272         /* currently scheduled peripheral endpoint */
 273         struct musb_qh          *in_qh;
 274         struct musb_qh          *out_qh;
 275
 276         u8                      rx_reinit;
 277         u8                      tx_reinit;
 278
 279         /* peripheral side */
 280         struct musb_ep          ep_in;                  /* TX */
 281         struct musb_ep          ep_out;                 /* RX */
 282 };
 283
 284 static inline struct musb_request *next_in_request(struct musb_hw_ep *hw_ep)
 285 {
 286         return next_request(&hw_ep->ep_in);
 287 }
 288
 289 static inline struct musb_request *next_out_request(struct musb_hw_ep *hw_ep)
 290 {
 291         return next_request(&hw_ep->ep_out);
 292 }
 293
 294 struct musb_csr_regs {
 295         /* FIFO registers */
 296         u16 txmaxp, txcsr, rxmaxp, rxcsr;
 297         u16 rxfifoadd, txfifoadd;
 298         u8 txtype, txinterval, rxtype, rxinterval;
 299         u8 rxfifosz, txfifosz;
 300         u8 txfunaddr, txhubaddr, txhubport;
 301         u8 rxfunaddr, rxhubaddr, rxhubport;
 302 };
 303
 304 struct musb_context_registers {
 305
 306         u8 power;
 307         u16 intrtxe, intrrxe;
 308         u8 intrusbe;
 309         u16 frame;
 310         u8 index, testmode;
 311
 312         u8 devctl, busctl, misc;
 313         u32 otg_interfsel;
 314
 315         struct musb_csr_regs index_regs[MUSB_C_NUM_EPS];
 316 };
 317
 318 /*
 319  * struct musb - Driver instance data.
 320  */
 321 struct musb {
 322         /* device lock */
 323         spinlock_t              lock;
 324
 325         const struct musb_platform_ops *ops;
 326         struct musb_context_registers context;
 327
 328         irqreturn_t             (*isr)(int, void *);
 329         struct work_struct      irq_work;
 330         struct work_struct      otg_notifier_work;
 331         u16                     hwvers;
 332
 333 /* this hub status bit is reserved by USB 2.0 and not seen by usbcore */
 334 #define MUSB_PORT_STAT_RESUME   (1 << 31)
 335
 336         u32                     port1_status;
 337
 338         unsigned long           rh_timer;
 339
 340         enum musb_h_ep0_state   ep0_stage;
 341
 342         /* bulk traffic normally dedicates endpoint hardware, and each
 343          * direction has its own ring of host side endpoints.
 344          * we try to progress the transfer at the head of each endpoint's
 345          * queue until it completes or NAKs too much; then we try the next
 346          * endpoint.
 347          */
 348         struct musb_hw_ep       *bulk_ep;
 349
 350         struct list_head        control;        /* of musb_qh */
 351         struct list_head        in_bulk;        /* of musb_qh */
 352         struct list_head        out_bulk;       /* of musb_qh */
 353
 354         struct timer_list       otg_timer;
 355         struct notifier_block   nb;
 356
 357         struct dma_controller   *dma_controller;
 358
 359         struct device           *controller;
 360         void __iomem            *ctrl_base;
 361         void __iomem            *mregs;
 362
 363 #if defined(CONFIG_USB_MUSB_TUSB6010) || \
 364         defined(CONFIG_USB_MUSB_TUSB6010_MODULE)
 365         dma_addr_t              async;
 366         dma_addr_t              sync;
 367         void __iomem            *sync_va;
 368 #endif
 369
 370         /* passed down from chip/board specific irq handlers */
 371         u8                      int_usb;
 372         u16                     int_rx;
 373         u16                     int_tx;
 374
 375         struct otg_transceiver  *xceiv;
 376         u8                      xceiv_event;
 377
 378         int nIrq;
 379         unsigned                irq_wake:1;
 380
 381         struct musb_hw_ep        endpoints[MUSB_C_NUM_EPS];
 382 #define control_ep              endpoints
 383
 384 #define VBUSERR_RETRY_COUNT     3
 385         u16                     vbuserr_retry;
 386         u16 epmask;
 387         u8 nr_endpoints;
 388
 389         u8 board_mode;          /* enum musb_mode */
 390         int                     (*board_set_power)(int state);
 391
 392         u8                      min_power;      /* vbus for periph, in mA/2 */
 393
 394         bool                    is_host;
 395
 396         int                     a_wait_bcon;    /* VBUS timeout in msecs */
 397         unsigned long           idle_timeout;   /* Next timeout in jiffies */
 398
 399         /* active means connected and not suspended */
 400         unsigned                is_active:1;
 401
 402         unsigned is_multipoint:1;
 403         unsigned ignore_disconnect:1;   /* during bus resets */
 404
 405         unsigned                hb_iso_rx:1;    /* high bandwidth iso rx? */
 406         unsigned                hb_iso_tx:1;    /* high bandwidth iso tx? */
 407         unsigned                dyn_fifo:1;     /* dynamic FIFO supported? */
 408
 409         unsigned                bulk_split:1;
 410 #define can_bulk_split(musb,type) \
 411         (((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_split)
 412
 413         unsigned                bulk_combine:1;
 414 #define can_bulk_combine(musb,type) \
 415         (((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_combine)
 416
 417         /* is_suspended means USB B_PERIPHERAL suspend */
 418         unsigned                is_suspended:1;
 419
 420         /* may_wakeup means remote wakeup is enabled */
 421         unsigned                may_wakeup:1;
 422
 423         /* is_self_powered is reported in device status and the
 424          * config descriptor.  is_bus_powered means B_PERIPHERAL
 425          * draws some VBUS current; both can be true.
 426          */
 427         unsigned                is_self_powered:1;
 428         unsigned                is_bus_powered:1;
 429
 430         unsigned                set_address:1;
 431         unsigned                test_mode:1;
 432         unsigned                softconnect:1;
 433
 434         u8                      address;
 435         u8                      test_mode_nr;
 436         u16                     ackpend;                /* ep0 */
 437         enum musb_g_ep0_state   ep0_state;
 438         struct usb_gadget       g;                      /* the gadget */
 439         struct usb_gadget_driver *gadget_driver;        /* its driver */
 440
 441         /*
 442          * FIXME: Remove this flag.
 443          *
 444          * This is only added to allow Blackfin to work
 445          * with current driver. For some unknown reason
 446          * Blackfin doesn't work with double buffering
 447          * and that's enabled by default.
 448          *
 449          * We added this flag to forcefully disable double
 450          * buffering until we get it working.
 451          */
 452         unsigned                double_buffer_not_ok:1 __deprecated;
 453
 454         struct musb_hdrc_config *config;
 455
 456 #ifdef MUSB_CONFIG_PROC_FS
 457         struct proc_dir_entry *proc_entry;
 458 #endif
 459 };
 460
 461 static inline struct musb *gadget_to_musb(struct usb_gadget *g)
 462 {
 463         return container_of(g, struct musb, g);
 464 }
 465
 466 #ifdef CONFIG_BLACKFIN
 467 static inline int musb_read_fifosize(struct musb *musb,
 468                 struct musb_hw_ep *hw_ep, u8 epnum)
 469 {
 470         musb->nr_endpoints++;
 471         musb->epmask |= (1 << epnum);
 472
 473         if (epnum < 5) {
 474                 hw_ep->max_packet_sz_tx = 128;
 475                 hw_ep->max_packet_sz_rx = 128;
 476         } else {
 477                 hw_ep->max_packet_sz_tx = 1024;
 478                 hw_ep->max_packet_sz_rx = 1024;
 479         }
 480         hw_ep->is_shared_fifo = false;
 481
 482         return 0;
 483 }
 484
 485 static inline void musb_configure_ep0(struct musb *musb)
 486 {
 487         musb->endpoints[0].max_packet_sz_tx = MUSB_EP0_FIFOSIZE;
 488         musb->endpoints[0].max_packet_sz_rx = MUSB_EP0_FIFOSIZE;
 489         musb->endpoints[0].is_shared_fifo = true;
 490 }
 491
 492 #else
 493
 494 static inline int musb_read_fifosize(struct musb *musb,
 495                 struct musb_hw_ep *hw_ep, u8 epnum)
 496 {
 497         void *mbase = musb->mregs;
 498         u8 reg = 0;
 499
 500         /* read from core using indexed model */
 501         reg = musb_readb(mbase, MUSB_EP_OFFSET(epnum, MUSB_FIFOSIZE));
 502         /* 0's returned when no more endpoints */
 503         if (!reg)
 504                 return -ENODEV;
 505
 506         musb->nr_endpoints++;
 507         musb->epmask |= (1 << epnum);
 508
 509         hw_ep->max_packet_sz_tx = 1 << (reg & 0x0f);
 510
 511         /* shared TX/RX FIFO? */
 512         if ((reg & 0xf0) == 0xf0) {
 513                 hw_ep->max_packet_sz_rx = hw_ep->max_packet_sz_tx;
 514                 hw_ep->is_shared_fifo = true;
 515                 return 0;
 516         } else {
 517                 hw_ep->max_packet_sz_rx = 1 << ((reg & 0xf0) >> 4);
 518                 hw_ep->is_shared_fifo = false;
 519         }
 520
 521         return 0;
 522 }
 523
 524 static inline void musb_configure_ep0(struct musb *musb)
 525 {
 526         musb->endpoints[0].max_packet_sz_tx = MUSB_EP0_FIFOSIZE;
 527         musb->endpoints[0].max_packet_sz_rx = MUSB_EP0_FIFOSIZE;
 528         musb->endpoints[0].is_shared_fifo = true;
 529 }
 530 #endif /* CONFIG_BLACKFIN */
 531
 532
 533 /***************************** Glue it together *****************************/
 534
 535 extern const char musb_driver_name[];
 536
 537 extern void musb_start(struct musb *musb);
 538 extern void musb_stop(struct musb *musb);
 539
 540 extern void musb_write_fifo(struct musb_hw_ep *ep, u16 len, const u8 *src);
 541 extern void musb_read_fifo(struct musb_hw_ep *ep, u16 len, u8 *dst);
 542
 543 extern void musb_load_testpacket(struct musb *);
 544
 545 extern irqreturn_t musb_interrupt(struct musb *);
 546
 547 extern void musb_hnp_stop(struct musb *musb);
 548
 549 static inline void musb_platform_set_vbus(struct musb *musb, int is_on)
 550 {
 551         if (musb->ops->set_vbus)
 552                 musb->ops->set_vbus(musb, is_on);
 553 }
 554
 555 static inline void musb_platform_enable(struct musb *musb)
 556 {
 557         if (musb->ops->enable)
 558                 musb->ops->enable(musb);
 559 }
 560
 561 static inline void musb_platform_disable(struct musb *musb)
 562 {
 563         if (musb->ops->disable)
 564                 musb->ops->disable(musb);
 565 }
 566
 567 static inline int musb_platform_set_mode(struct musb *musb, u8 mode)
 568 {
 569         if (!musb->ops->set_mode)
 570                 return 0;
 571
 572         return musb->ops->set_mode(musb, mode);
 573 }
 574
 575 static inline void musb_platform_try_idle(struct musb *musb,
 576                 unsigned long timeout)
 577 {
 578         if (musb->ops->try_idle)
 579                 musb->ops->try_idle(musb, timeout);
 580 }
 581
 582 static inline int musb_platform_get_vbus_status(struct musb *musb)
 583 {
 584         if (!musb->ops->vbus_status)
 585                 return 0;
 586
 587         return musb->ops->vbus_status(musb);
 588 }
 589
 590 static inline int musb_platform_init(struct musb *musb)
 591 {
 592         if (!musb->ops->init)
 593                 return -EINVAL;
 594
 595         return musb->ops->init(musb);
 596 }
 597
 598 static inline int musb_platform_exit(struct musb *musb)
 599 {
 600         if (!musb->ops->exit)
 601                 return -EINVAL;
 602
 603         return musb->ops->exit(musb);
 604 }
 605
 606 #endif  /* __MUSB_CORE_H__ */