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