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/clk.h>
  44 #include <linux/device.h>
  45 #include <linux/usb/ch9.h>
  46 #include <linux/usb/gadget.h>
  47 #include <linux/usb.h>
  48 #include <linux/usb/otg.h>
  49 #include <linux/usb/musb.h>
  50
  51 struct musb;
  52 struct musb_hw_ep;
  53 struct musb_ep;
  54
  55
  56 #include "musb_debug.h"
  57 #include "musb_dma.h"
  58
  59 #include "musb_io.h"
  60 #include "musb_regs.h"
  61
  62 #include "musb_gadget.h"
  63 #include "../core/hcd.h"
  64 #include "musb_host.h"
  65
  66
  67
  68 #ifdef CONFIG_USB_MUSB_OTG
  69
  70 #define is_peripheral_enabled(musb)     ((musb)->board_mode != MUSB_HOST)
  71 #define is_host_enabled(musb)           ((musb)->board_mode != MUSB_PERIPHERAL)
  72 #define is_otg_enabled(musb)            ((musb)->board_mode == MUSB_OTG)
  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 #else
  81 #define is_peripheral_enabled(musb)     is_peripheral_capable()
  82 #define is_host_enabled(musb)           is_host_capable()
  83 #define is_otg_enabled(musb)            0
  84
  85 #define is_peripheral_active(musb)      is_peripheral_capable()
  86 #define is_host_active(musb)            is_host_capable()
  87 #endif
  88
  89 #if defined(CONFIG_USB_MUSB_OTG) || defined(CONFIG_USB_MUSB_PERIPHERAL)
  90 /* for some reason, the "select USB_GADGET_MUSB_HDRC" doesn't always
  91  * override that choice selection (often USB_GADGET_DUMMY_HCD).
  92  */
  93 #ifndef CONFIG_USB_GADGET_MUSB_HDRC
  94 #error bogus Kconfig output ... select CONFIG_USB_GADGET_MUSB_HDRC
  95 #endif
  96 #endif  /* need MUSB gadget selection */
  97
  98 #ifndef CONFIG_HAVE_CLK
  99 /* Dummy stub for clk framework */
 100 #define clk_get(dev, id)        NULL
 101 #define clk_put(clock)          do {} while (0)
 102 #define clk_enable(clock)       do {} while (0)
 103 #define clk_disable(clock)      do {} while (0)
 104 #endif
 105
 106 #ifdef CONFIG_PROC_FS
 107 #include <linux/fs.h>
 108 #define MUSB_CONFIG_PROC_FS
 109 #endif
 110
 111 /****************************** PERIPHERAL ROLE *****************************/
 112
 113 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 114
 115 #define is_peripheral_capable() (1)
 116
 117 extern irqreturn_t musb_g_ep0_irq(struct musb *);
 118 extern void musb_g_tx(struct musb *, u8);
 119 extern void musb_g_rx(struct musb *, u8);
 120 extern void musb_g_reset(struct musb *);
 121 extern void musb_g_suspend(struct musb *);
 122 extern void musb_g_resume(struct musb *);
 123 extern void musb_g_wakeup(struct musb *);
 124 extern void musb_g_disconnect(struct musb *);
 125
 126 #else
 127
 128 #define is_peripheral_capable() (0)
 129
 130 static inline irqreturn_t musb_g_ep0_irq(struct musb *m) { return IRQ_NONE; }
 131 static inline void musb_g_reset(struct musb *m) {}
 132 static inline void musb_g_suspend(struct musb *m) {}
 133 static inline void musb_g_resume(struct musb *m) {}
 134 static inline void musb_g_wakeup(struct musb *m) {}
 135 static inline void musb_g_disconnect(struct musb *m) {}
 136
 137 #endif
 138
 139 /****************************** HOST ROLE ***********************************/
 140
 141 #ifdef CONFIG_USB_MUSB_HDRC_HCD
 142
 143 #define is_host_capable()       (1)
 144
 145 extern irqreturn_t musb_h_ep0_irq(struct musb *);
 146 extern void musb_host_tx(struct musb *, u8);
 147 extern void musb_host_rx(struct musb *, u8);
 148
 149 #else
 150
 151 #define is_host_capable()       (0)
 152
 153 static inline irqreturn_t musb_h_ep0_irq(struct musb *m) { return IRQ_NONE; }
 154 static inline void musb_host_tx(struct musb *m, u8 e) {}
 155 static inline void musb_host_rx(struct musb *m, u8 e) {}
 156
 157 #endif
 158
 159
 160 /****************************** CONSTANTS ********************************/
 161
 162 #ifndef MUSB_C_NUM_EPS
 163 #define MUSB_C_NUM_EPS ((u8)16)
 164 #endif
 165
 166 #ifndef MUSB_MAX_END0_PACKET
 167 #define MUSB_MAX_END0_PACKET ((u16)MUSB_EP0_FIFOSIZE)
 168 #endif
 169
 170 /* host side ep0 states */
 171 enum musb_h_ep0_state {
 172         MUSB_EP0_IDLE,
 173         MUSB_EP0_START,                 /* expect ack of setup */
 174         MUSB_EP0_IN,                    /* expect IN DATA */
 175         MUSB_EP0_OUT,                   /* expect ack of OUT DATA */
 176         MUSB_EP0_STATUS,                /* expect ack of STATUS */
 177 } __attribute__ ((packed));
 178
 179 /* peripheral side ep0 states */
 180 enum musb_g_ep0_state {
 181         MUSB_EP0_STAGE_IDLE,            /* idle, waiting for SETUP */
 182         MUSB_EP0_STAGE_SETUP,           /* received SETUP */
 183         MUSB_EP0_STAGE_TX,              /* IN data */
 184         MUSB_EP0_STAGE_RX,              /* OUT data */
 185         MUSB_EP0_STAGE_STATUSIN,        /* (after OUT data) */
 186         MUSB_EP0_STAGE_STATUSOUT,       /* (after IN data) */
 187         MUSB_EP0_STAGE_ACKWAIT,         /* after zlp, before statusin */
 188 } __attribute__ ((packed));
 189
 190 /*
 191  * OTG protocol constants.  See USB OTG 1.3 spec,
 192  * sections 5.5 "Device Timings" and 6.6.5 "Timers".
 193  */
 194 #define OTG_TIME_A_WAIT_VRISE   100             /* msec (max) */
 195 #define OTG_TIME_A_WAIT_BCON    1100            /* min 1 second */
 196 #define OTG_TIME_A_AIDL_BDIS    200             /* min 200 msec */
 197 #define OTG_TIME_B_ASE0_BRST    100             /* min 3.125 ms */
 198
 199
 200 /*************************** REGISTER ACCESS ********************************/
 201
 202 /* Endpoint registers (other than dynfifo setup) can be accessed either
 203  * directly with the "flat" model, or after setting up an index register.
 204  */
 205
 206 #if defined(CONFIG_ARCH_DAVINCI) || defined(CONFIG_ARCH_OMAP2430) \
 207                 || defined(CONFIG_ARCH_OMAP3430) || defined(CONFIG_BLACKFIN)
 208 /* REVISIT indexed access seemed to
 209  * misbehave (on DaVinci) for at least peripheral IN ...
 210  */
 211 #define MUSB_FLAT_REG
 212 #endif
 213
 214 /* TUSB mapping: "flat" plus ep0 special cases */
 215 #if     defined(CONFIG_USB_TUSB6010)
 216 #define musb_ep_select(_mbase, _epnum) \
 217         musb_writeb((_mbase), MUSB_INDEX, (_epnum))
 218 #define MUSB_EP_OFFSET                  MUSB_TUSB_OFFSET
 219
 220 /* "flat" mapping: each endpoint has its own i/o address */
 221 #elif   defined(MUSB_FLAT_REG)
 222 #define musb_ep_select(_mbase, _epnum)  (((void)(_mbase)), ((void)(_epnum)))
 223 #define MUSB_EP_OFFSET                  MUSB_FLAT_OFFSET
 224
 225 /* "indexed" mapping: INDEX register controls register bank select */
 226 #else
 227 #define musb_ep_select(_mbase, _epnum) \
 228         musb_writeb((_mbase), MUSB_INDEX, (_epnum))
 229 #define MUSB_EP_OFFSET                  MUSB_INDEXED_OFFSET
 230 #endif
 231
 232 /****************************** FUNCTIONS ********************************/
 233
 234 #define MUSB_HST_MODE(_musb)\
 235         { (_musb)->is_host = true; }
 236 #define MUSB_DEV_MODE(_musb) \
 237         { (_musb)->is_host = false; }
 238
 239 #define test_devctl_hst_mode(_x) \
 240         (musb_readb((_x)->mregs, MUSB_DEVCTL)&MUSB_DEVCTL_HM)
 241
 242 #define MUSB_MODE(musb) ((musb)->is_host ? "Host" : "Peripheral")
 243
 244 /******************************** TYPES *************************************/
 245
 246 /*
 247  * struct musb_hw_ep - endpoint hardware (bidirectional)
 248  *
 249  * Ordered slightly for better cacheline locality.
 250  */
 251 struct musb_hw_ep {
 252         struct musb             *musb;
 253         void __iomem            *fifo;
 254         void __iomem            *regs;
 255
 256 #ifdef CONFIG_USB_TUSB6010
 257         void __iomem            *conf;
 258 #endif
 259
 260         /* index in musb->endpoints[]  */
 261         u8                      epnum;
 262
 263         /* hardware configuration, possibly dynamic */
 264         bool                    is_shared_fifo;
 265         bool                    tx_double_buffered;
 266         bool                    rx_double_buffered;
 267         u16                     max_packet_sz_tx;
 268         u16                     max_packet_sz_rx;
 269
 270         struct dma_channel      *tx_channel;
 271         struct dma_channel      *rx_channel;
 272
 273 #ifdef CONFIG_USB_TUSB6010
 274         /* TUSB has "asynchronous" and "synchronous" dma modes */
 275         dma_addr_t              fifo_async;
 276         dma_addr_t              fifo_sync;
 277         void __iomem            *fifo_sync_va;
 278 #endif
 279
 280 #ifdef CONFIG_USB_MUSB_HDRC_HCD
 281         void __iomem            *target_regs;
 282
 283         /* currently scheduled peripheral endpoint */
 284         struct musb_qh          *in_qh;
 285         struct musb_qh          *out_qh;
 286
 287         u8                      rx_reinit;
 288         u8                      tx_reinit;
 289 #endif
 290
 291 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 292         /* peripheral side */
 293         struct musb_ep          ep_in;                  /* TX */
 294         struct musb_ep          ep_out;                 /* RX */
 295 #endif
 296 };
 297
 298 static inline struct usb_request *next_in_request(struct musb_hw_ep *hw_ep)
 299 {
 300 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 301         return next_request(&hw_ep->ep_in);
 302 #else
 303         return NULL;
 304 #endif
 305 }
 306
 307 static inline struct usb_request *next_out_request(struct musb_hw_ep *hw_ep)
 308 {
 309 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 310         return next_request(&hw_ep->ep_out);
 311 #else
 312         return NULL;
 313 #endif
 314 }
 315
 316 /*
 317  * struct musb - Driver instance data.
 318  */
 319 struct musb {
 320         /* device lock */
 321         spinlock_t              lock;
 322         struct clk              *clock;
 323         irqreturn_t             (*isr)(int, void *);
 324         struct work_struct      irq_work;
 325
 326 /* this hub status bit is reserved by USB 2.0 and not seen by usbcore */
 327 #define MUSB_PORT_STAT_RESUME   (1 << 31)
 328
 329         u32                     port1_status;
 330
 331 #ifdef CONFIG_USB_MUSB_HDRC_HCD
 332         unsigned long           rh_timer;
 333
 334         enum musb_h_ep0_state   ep0_stage;
 335
 336         /* bulk traffic normally dedicates endpoint hardware, and each
 337          * direction has its own ring of host side endpoints.
 338          * we try to progress the transfer at the head of each endpoint's
 339          * queue until it completes or NAKs too much; then we try the next
 340          * endpoint.
 341          */
 342         struct musb_hw_ep       *bulk_ep;
 343
 344         struct list_head        control;        /* of musb_qh */
 345         struct list_head        in_bulk;        /* of musb_qh */
 346         struct list_head        out_bulk;       /* of musb_qh */
 347
 348         struct timer_list       otg_timer;
 349 #endif
 350
 351         /* called with IRQs blocked; ON/nonzero implies starting a session,
 352          * and waiting at least a_wait_vrise_tmout.
 353          */
 354         void                    (*board_set_vbus)(struct musb *, int is_on);
 355
 356         struct dma_controller   *dma_controller;
 357
 358         struct device           *controller;
 359         void __iomem            *ctrl_base;
 360         void __iomem            *mregs;
 361
 362 #ifdef CONFIG_USB_TUSB6010
 363         dma_addr_t              async;
 364         dma_addr_t              sync;
 365         void __iomem            *sync_va;
 366 #endif
 367
 368         /* passed down from chip/board specific irq handlers */
 369         u8                      int_usb;
 370         u16                     int_rx;
 371         u16                     int_tx;
 372
 373         struct otg_transceiver  *xceiv;
 374
 375         int nIrq;
 376         unsigned                irq_wake:1;
 377
 378         struct musb_hw_ep        endpoints[MUSB_C_NUM_EPS];
 379 #define control_ep              endpoints
 380
 381 #define VBUSERR_RETRY_COUNT     3
 382         u16                     vbuserr_retry;
 383         u16 epmask;
 384         u8 nr_endpoints;
 385
 386         u8 board_mode;          /* enum musb_mode */
 387         int                     (*board_set_power)(int state);
 388
 389         int                     (*set_clock)(struct clk *clk, int is_active);
 390
 391         u8                      min_power;      /* vbus for periph, in mA/2 */
 392
 393         bool                    is_host;
 394
 395         int                     a_wait_bcon;    /* VBUS timeout in msecs */
 396         unsigned long           idle_timeout;   /* Next timeout in jiffies */
 397
 398         /* active means connected and not suspended */
 399         unsigned                is_active:1;
 400
 401         unsigned is_multipoint:1;
 402         unsigned ignore_disconnect:1;   /* during bus resets */
 403
 404         unsigned                hb_iso_rx:1;    /* high bandwidth iso rx? */
 405         unsigned                hb_iso_tx:1;    /* high bandwidth iso tx? */
 406
 407 #ifdef C_MP_TX
 408         unsigned bulk_split:1;
 409 #define can_bulk_split(musb,type) \
 410                 (((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_split)
 411 #else
 412 #define can_bulk_split(musb, type)      0
 413 #endif
 414
 415 #ifdef C_MP_RX
 416         unsigned bulk_combine:1;
 417 #define can_bulk_combine(musb,type) \
 418                 (((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_combine)
 419 #else
 420 #define can_bulk_combine(musb, type)    0
 421 #endif
 422
 423 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 424         /* is_suspended means USB B_PERIPHERAL suspend */
 425         unsigned                is_suspended:1;
 426
 427         /* may_wakeup means remote wakeup is enabled */
 428         unsigned                may_wakeup:1;
 429
 430         /* is_self_powered is reported in device status and the
 431          * config descriptor.  is_bus_powered means B_PERIPHERAL
 432          * draws some VBUS current; both can be true.
 433          */
 434         unsigned                is_self_powered:1;
 435         unsigned                is_bus_powered:1;
 436
 437         unsigned                set_address:1;
 438         unsigned                test_mode:1;
 439         unsigned                softconnect:1;
 440
 441         u8                      address;
 442         u8                      test_mode_nr;
 443         u16                     ackpend;                /* ep0 */
 444         enum musb_g_ep0_state   ep0_state;
 445         struct usb_gadget       g;                      /* the gadget */
 446         struct usb_gadget_driver *gadget_driver;        /* its driver */
 447 #endif
 448
 449         struct musb_hdrc_config *config;
 450
 451 #ifdef MUSB_CONFIG_PROC_FS
 452         struct proc_dir_entry *proc_entry;
 453 #endif
 454 };
 455
 456 static inline void musb_set_vbus(struct musb *musb, int is_on)
 457 {
 458         musb->board_set_vbus(musb, is_on);
 459 }
 460
 461 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 462 static inline struct musb *gadget_to_musb(struct usb_gadget *g)
 463 {
 464         return container_of(g, struct musb, g);
 465 }
 466 #endif
 467
 468 #ifdef CONFIG_BLACKFIN
 469 static inline int musb_read_fifosize(struct musb *musb,
 470                 struct musb_hw_ep *hw_ep, u8 epnum)
 471 {
 472         musb->nr_endpoints++;
 473         musb->epmask |= (1 << epnum);
 474
 475         if (epnum < 5) {
 476                 hw_ep->max_packet_sz_tx = 128;
 477                 hw_ep->max_packet_sz_rx = 128;
 478         } else {
 479                 hw_ep->max_packet_sz_tx = 1024;
 480                 hw_ep->max_packet_sz_rx = 1024;
 481         }
 482         hw_ep->is_shared_fifo = false;
 483
 484         return 0;
 485 }
 486
 487 static inline void musb_configure_ep0(struct musb *musb)
 488 {
 489         musb->endpoints[0].max_packet_sz_tx = MUSB_EP0_FIFOSIZE;
 490         musb->endpoints[0].max_packet_sz_rx = MUSB_EP0_FIFOSIZE;
 491         musb->endpoints[0].is_shared_fifo = true;
 492 }
 493
 494 #else
 495
 496 static inline int musb_read_fifosize(struct musb *musb,
 497                 struct musb_hw_ep *hw_ep, u8 epnum)
 498 {
 499         void *mbase = musb->mregs;
 500         u8 reg = 0;
 501
 502         /* read from core using indexed model */
 503         reg = musb_readb(mbase, MUSB_EP_OFFSET(epnum, MUSB_FIFOSIZE));
 504         /* 0's returned when no more endpoints */
 505         if (!reg)
 506                 return -ENODEV;
 507
 508         musb->nr_endpoints++;
 509         musb->epmask |= (1 << epnum);
 510
 511         hw_ep->max_packet_sz_tx = 1 << (reg & 0x0f);
 512
 513         /* shared TX/RX FIFO? */
 514         if ((reg & 0xf0) == 0xf0) {
 515                 hw_ep->max_packet_sz_rx = hw_ep->max_packet_sz_tx;
 516                 hw_ep->is_shared_fifo = true;
 517                 return 0;
 518         } else {
 519                 hw_ep->max_packet_sz_rx = 1 << ((reg & 0xf0) >> 4);
 520                 hw_ep->is_shared_fifo = false;
 521         }
 522
 523         return 0;
 524 }
 525
 526 static inline void musb_configure_ep0(struct musb *musb)
 527 {
 528         musb->endpoints[0].max_packet_sz_tx = MUSB_EP0_FIFOSIZE;
 529         musb->endpoints[0].max_packet_sz_rx = MUSB_EP0_FIFOSIZE;
 530         musb->endpoints[0].is_shared_fifo = true;
 531 }
 532 #endif /* CONFIG_BLACKFIN */
 533
 534
 535 /***************************** Glue it together *****************************/
 536
 537 extern const char musb_driver_name[];
 538
 539 extern void musb_start(struct musb *musb);
 540 extern void musb_stop(struct musb *musb);
 541
 542 extern void musb_write_fifo(struct musb_hw_ep *ep, u16 len, const u8 *src);
 543 extern void musb_read_fifo(struct musb_hw_ep *ep, u16 len, u8 *dst);
 544
 545 extern void musb_load_testpacket(struct musb *);
 546
 547 extern irqreturn_t musb_interrupt(struct musb *);
 548
 549 extern void musb_platform_enable(struct musb *musb);
 550 extern void musb_platform_disable(struct musb *musb);
 551
 552 extern void musb_hnp_stop(struct musb *musb);
 553
 554 extern int musb_platform_set_mode(struct musb *musb, u8 musb_mode);
 555
 556 #if defined(CONFIG_USB_TUSB6010) || defined(CONFIG_BLACKFIN) || \
 557         defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP34XX)
 558 extern void musb_platform_try_idle(struct musb *musb, unsigned long timeout);
 559 #else
 560 #define musb_platform_try_idle(x, y)            do {} while (0)
 561 #endif
 562
 563 #if defined(CONFIG_USB_TUSB6010) || defined(CONFIG_BLACKFIN)
 564 extern int musb_platform_get_vbus_status(struct musb *musb);
 565 #else
 566 #define musb_platform_get_vbus_status(x)        0
 567 #endif
 568
 569 extern int __init musb_platform_init(struct musb *musb);
 570 extern int musb_platform_exit(struct musb *musb);
 571
 572 #endif  /* __MUSB_CORE_H__ */