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/smp_lock.h>
  42 #include <linux/errno.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
  99 #ifdef CONFIG_PROC_FS
 100 #include <linux/fs.h>
 101 #define MUSB_CONFIG_PROC_FS
 102 #endif
 103
 104 /****************************** PERIPHERAL ROLE *****************************/
 105
 106 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 107
 108 #define is_peripheral_capable() (1)
 109
 110 extern irqreturn_t musb_g_ep0_irq(struct musb *);
 111 extern void musb_g_tx(struct musb *, u8);
 112 extern void musb_g_rx(struct musb *, u8);
 113 extern void musb_g_reset(struct musb *);
 114 extern void musb_g_suspend(struct musb *);
 115 extern void musb_g_resume(struct musb *);
 116 extern void musb_g_wakeup(struct musb *);
 117 extern void musb_g_disconnect(struct musb *);
 118
 119 #else
 120
 121 #define is_peripheral_capable() (0)
 122
 123 static inline irqreturn_t musb_g_ep0_irq(struct musb *m) { return IRQ_NONE; }
 124 static inline void musb_g_reset(struct musb *m) {}
 125 static inline void musb_g_suspend(struct musb *m) {}
 126 static inline void musb_g_resume(struct musb *m) {}
 127 static inline void musb_g_wakeup(struct musb *m) {}
 128 static inline void musb_g_disconnect(struct musb *m) {}
 129
 130 #endif
 131
 132 /****************************** HOST ROLE ***********************************/
 133
 134 #ifdef CONFIG_USB_MUSB_HDRC_HCD
 135
 136 #define is_host_capable()       (1)
 137
 138 extern irqreturn_t musb_h_ep0_irq(struct musb *);
 139 extern void musb_host_tx(struct musb *, u8);
 140 extern void musb_host_rx(struct musb *, u8);
 141
 142 #else
 143
 144 #define is_host_capable()       (0)
 145
 146 static inline irqreturn_t musb_h_ep0_irq(struct musb *m) { return IRQ_NONE; }
 147 static inline void musb_host_tx(struct musb *m, u8 e) {}
 148 static inline void musb_host_rx(struct musb *m, u8 e) {}
 149
 150 #endif
 151
 152
 153 /****************************** CONSTANTS ********************************/
 154
 155 #ifndef MUSB_C_NUM_EPS
 156 #define MUSB_C_NUM_EPS ((u8)16)
 157 #endif
 158
 159 #ifndef MUSB_MAX_END0_PACKET
 160 #define MUSB_MAX_END0_PACKET ((u16)MUSB_EP0_FIFOSIZE)
 161 #endif
 162
 163 /* host side ep0 states */
 164 enum musb_h_ep0_state {
 165         MUSB_EP0_IDLE,
 166         MUSB_EP0_START,                 /* expect ack of setup */
 167         MUSB_EP0_IN,                    /* expect IN DATA */
 168         MUSB_EP0_OUT,                   /* expect ack of OUT DATA */
 169         MUSB_EP0_STATUS,                /* expect ack of STATUS */
 170 } __attribute__ ((packed));
 171
 172 /* peripheral side ep0 states */
 173 enum musb_g_ep0_state {
 174         MUSB_EP0_STAGE_SETUP,           /* idle, waiting for setup */
 175         MUSB_EP0_STAGE_TX,              /* IN data */
 176         MUSB_EP0_STAGE_RX,              /* OUT data */
 177         MUSB_EP0_STAGE_STATUSIN,        /* (after OUT data) */
 178         MUSB_EP0_STAGE_STATUSOUT,       /* (after IN data) */
 179         MUSB_EP0_STAGE_ACKWAIT,         /* after zlp, before statusin */
 180 } __attribute__ ((packed));
 181
 182 /* OTG protocol constants */
 183 #define OTG_TIME_A_WAIT_VRISE   100             /* msec (max) */
 184 #define OTG_TIME_A_WAIT_BCON    0               /* 0=infinite; min 1000 msec */
 185 #define OTG_TIME_A_IDLE_BDIS    200             /* msec (min) */
 186
 187 /*************************** REGISTER ACCESS ********************************/
 188
 189 /* Endpoint registers (other than dynfifo setup) can be accessed either
 190  * directly with the "flat" model, or after setting up an index register.
 191  */
 192
 193 #if defined(CONFIG_ARCH_DAVINCI) || defined(CONFIG_ARCH_OMAP2430) \
 194                 || defined(CONFIG_ARCH_OMAP3430) || defined(CONFIG_BLACKFIN)
 195 /* REVISIT indexed access seemed to
 196  * misbehave (on DaVinci) for at least peripheral IN ...
 197  */
 198 #define MUSB_FLAT_REG
 199 #endif
 200
 201 /* TUSB mapping: "flat" plus ep0 special cases */
 202 #if     defined(CONFIG_USB_TUSB6010)
 203 #define musb_ep_select(_mbase, _epnum) \
 204         musb_writeb((_mbase), MUSB_INDEX, (_epnum))
 205 #define MUSB_EP_OFFSET                  MUSB_TUSB_OFFSET
 206
 207 /* "flat" mapping: each endpoint has its own i/o address */
 208 #elif   defined(MUSB_FLAT_REG)
 209 #define musb_ep_select(_mbase, _epnum)  (((void)(_mbase)), ((void)(_epnum)))
 210 #define MUSB_EP_OFFSET                  MUSB_FLAT_OFFSET
 211
 212 /* "indexed" mapping: INDEX register controls register bank select */
 213 #else
 214 #define musb_ep_select(_mbase, _epnum) \
 215         musb_writeb((_mbase), MUSB_INDEX, (_epnum))
 216 #define MUSB_EP_OFFSET                  MUSB_INDEXED_OFFSET
 217 #endif
 218
 219 /****************************** FUNCTIONS ********************************/
 220
 221 #define MUSB_HST_MODE(_musb)\
 222         { (_musb)->is_host = true; }
 223 #define MUSB_DEV_MODE(_musb) \
 224         { (_musb)->is_host = false; }
 225
 226 #define test_devctl_hst_mode(_x) \
 227         (musb_readb((_x)->mregs, MUSB_DEVCTL)&MUSB_DEVCTL_HM)
 228
 229 #define MUSB_MODE(musb) ((musb)->is_host ? "Host" : "Peripheral")
 230
 231 /******************************** TYPES *************************************/
 232
 233 /*
 234  * struct musb_hw_ep - endpoint hardware (bidirectional)
 235  *
 236  * Ordered slightly for better cacheline locality.
 237  */
 238 struct musb_hw_ep {
 239         struct musb             *musb;
 240         void __iomem            *fifo;
 241         void __iomem            *regs;
 242
 243 #ifdef CONFIG_USB_TUSB6010
 244         void __iomem            *conf;
 245 #endif
 246
 247         /* index in musb->endpoints[]  */
 248         u8                      epnum;
 249
 250         /* hardware configuration, possibly dynamic */
 251         bool                    is_shared_fifo;
 252         bool                    tx_double_buffered;
 253         bool                    rx_double_buffered;
 254         u16                     max_packet_sz_tx;
 255         u16                     max_packet_sz_rx;
 256
 257         struct dma_channel      *tx_channel;
 258         struct dma_channel      *rx_channel;
 259
 260 #ifdef CONFIG_USB_TUSB6010
 261         /* TUSB has "asynchronous" and "synchronous" dma modes */
 262         dma_addr_t              fifo_async;
 263         dma_addr_t              fifo_sync;
 264         void __iomem            *fifo_sync_va;
 265 #endif
 266
 267 #ifdef CONFIG_USB_MUSB_HDRC_HCD
 268         void __iomem            *target_regs;
 269
 270         /* currently scheduled peripheral endpoint */
 271         struct musb_qh          *in_qh;
 272         struct musb_qh          *out_qh;
 273
 274         u8                      rx_reinit;
 275         u8                      tx_reinit;
 276 #endif
 277
 278 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 279         /* peripheral side */
 280         struct musb_ep          ep_in;                  /* TX */
 281         struct musb_ep          ep_out;                 /* RX */
 282 #endif
 283 };
 284
 285 static inline struct usb_request *next_in_request(struct musb_hw_ep *hw_ep)
 286 {
 287 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 288         return next_request(&hw_ep->ep_in);
 289 #else
 290         return NULL;
 291 #endif
 292 }
 293
 294 static inline struct usb_request *next_out_request(struct musb_hw_ep *hw_ep)
 295 {
 296 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 297         return next_request(&hw_ep->ep_out);
 298 #else
 299         return NULL;
 300 #endif
 301 }
 302
 303 /*
 304  * struct musb - Driver instance data.
 305  */
 306 struct musb {
 307         /* device lock */
 308         spinlock_t              lock;
 309         struct clk              *clock;
 310         irqreturn_t             (*isr)(int, void *);
 311         struct work_struct      irq_work;
 312
 313 /* this hub status bit is reserved by USB 2.0 and not seen by usbcore */
 314 #define MUSB_PORT_STAT_RESUME   (1 << 31)
 315
 316         u32                     port1_status;
 317
 318 #ifdef CONFIG_USB_MUSB_HDRC_HCD
 319         unsigned long           rh_timer;
 320
 321         enum musb_h_ep0_state   ep0_stage;
 322
 323         /* bulk traffic normally dedicates endpoint hardware, and each
 324          * direction has its own ring of host side endpoints.
 325          * we try to progress the transfer at the head of each endpoint's
 326          * queue until it completes or NAKs too much; then we try the next
 327          * endpoint.
 328          */
 329         struct musb_hw_ep       *bulk_ep;
 330
 331         struct list_head        control;        /* of musb_qh */
 332         struct list_head        in_bulk;        /* of musb_qh */
 333         struct list_head        out_bulk;       /* of musb_qh */
 334         struct musb_qh          *periodic[32];  /* tree of interrupt+iso */
 335 #endif
 336
 337         /* called with IRQs blocked; ON/nonzero implies starting a session,
 338          * and waiting at least a_wait_vrise_tmout.
 339          */
 340         void                    (*board_set_vbus)(struct musb *, int is_on);
 341
 342         struct dma_controller   *dma_controller;
 343
 344         struct device           *controller;
 345         void __iomem            *ctrl_base;
 346         void __iomem            *mregs;
 347
 348 #ifdef CONFIG_USB_TUSB6010
 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 otg_transceiver  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         u8 board_mode;          /* enum musb_mode */
 373         int                     (*board_set_power)(int state);
 374
 375         int                     (*set_clock)(struct clk *clk, int is_active);
 376
 377         u8                      min_power;      /* vbus for periph, in mA/2 */
 378
 379         bool                    is_host;
 380
 381         int                     a_wait_bcon;    /* VBUS timeout in msecs */
 382         unsigned long           idle_timeout;   /* Next timeout in jiffies */
 383
 384         /* active means connected and not suspended */
 385         unsigned                is_active:1;
 386
 387         unsigned is_multipoint:1;
 388         unsigned ignore_disconnect:1;   /* during bus resets */
 389
 390 #ifdef C_MP_TX
 391         unsigned bulk_split:1;
 392 #define can_bulk_split(musb,type) \
 393                 (((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_split)
 394 #else
 395 #define can_bulk_split(musb, type)      0
 396 #endif
 397
 398 #ifdef C_MP_RX
 399         unsigned bulk_combine:1;
 400 #define can_bulk_combine(musb,type) \
 401                 (((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_combine)
 402 #else
 403 #define can_bulk_combine(musb, type)    0
 404 #endif
 405
 406 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 407         /* is_suspended means USB B_PERIPHERAL suspend */
 408         unsigned                is_suspended:1;
 409
 410         /* may_wakeup means remote wakeup is enabled */
 411         unsigned                may_wakeup:1;
 412
 413         /* is_self_powered is reported in device status and the
 414          * config descriptor.  is_bus_powered means B_PERIPHERAL
 415          * draws some VBUS current; both can be true.
 416          */
 417         unsigned                is_self_powered:1;
 418         unsigned                is_bus_powered:1;
 419
 420         unsigned                set_address:1;
 421         unsigned                test_mode:1;
 422         unsigned                softconnect:1;
 423
 424         u8                      address;
 425         u8                      test_mode_nr;
 426         u16                     ackpend;                /* ep0 */
 427         enum musb_g_ep0_state   ep0_state;
 428         struct usb_gadget       g;                      /* the gadget */
 429         struct usb_gadget_driver *gadget_driver;        /* its driver */
 430 #endif
 431
 432         struct musb_hdrc_config *config;
 433
 434 #ifdef MUSB_CONFIG_PROC_FS
 435         struct proc_dir_entry *proc_entry;
 436 #endif
 437 };
 438
 439 static inline void musb_set_vbus(struct musb *musb, int is_on)
 440 {
 441         musb->board_set_vbus(musb, is_on);
 442 }
 443
 444 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 445 static inline struct musb *gadget_to_musb(struct usb_gadget *g)
 446 {
 447         return container_of(g, struct musb, g);
 448 }
 449 #endif
 450
 451 #ifdef CONFIG_BLACKFIN
 452 static inline int musb_read_fifosize(struct musb *musb,
 453                 struct musb_hw_ep *hw_ep, u8 epnum)
 454 {
 455         musb->nr_endpoints++;
 456         musb->epmask |= (1 << epnum);
 457
 458         if (epnum < 5) {
 459                 hw_ep->max_packet_sz_tx = 128;
 460                 hw_ep->max_packet_sz_rx = 128;
 461         } else {
 462                 hw_ep->max_packet_sz_tx = 1024;
 463                 hw_ep->max_packet_sz_rx = 1024;
 464         }
 465         hw_ep->is_shared_fifo = false;
 466
 467         return 0;
 468 }
 469
 470 static inline void musb_configure_ep0(struct musb *musb)
 471 {
 472         musb->endpoints[0].max_packet_sz_tx = MUSB_EP0_FIFOSIZE;
 473         musb->endpoints[0].max_packet_sz_rx = MUSB_EP0_FIFOSIZE;
 474         musb->endpoints[0].is_shared_fifo = true;
 475 }
 476
 477 #else
 478
 479 static inline int musb_read_fifosize(struct musb *musb,
 480                 struct musb_hw_ep *hw_ep, u8 epnum)
 481 {
 482         u8 reg = 0;
 483
 484         /* read from core using indexed model */
 485         reg = musb_readb(hw_ep->regs, 0x10 + MUSB_FIFOSIZE);
 486         /* 0's returned when no more endpoints */
 487         if (!reg)
 488                 return -ENODEV;
 489
 490         musb->nr_endpoints++;
 491         musb->epmask |= (1 << epnum);
 492
 493         hw_ep->max_packet_sz_tx = 1 << (reg & 0x0f);
 494
 495         /* shared TX/RX FIFO? */
 496         if ((reg & 0xf0) == 0xf0) {
 497                 hw_ep->max_packet_sz_rx = hw_ep->max_packet_sz_tx;
 498                 hw_ep->is_shared_fifo = true;
 499                 return 0;
 500         } else {
 501                 hw_ep->max_packet_sz_rx = 1 << ((reg & 0xf0) >> 4);
 502                 hw_ep->is_shared_fifo = false;
 503         }
 504
 505         return 0;
 506 }
 507
 508 static inline void musb_configure_ep0(struct musb *musb)
 509 {
 510         musb->endpoints[0].max_packet_sz_tx = MUSB_EP0_FIFOSIZE;
 511         musb->endpoints[0].max_packet_sz_rx = MUSB_EP0_FIFOSIZE;
 512 }
 513 #endif /* CONFIG_BLACKFIN */
 514
 515
 516 /***************************** Glue it together *****************************/
 517
 518 extern const char musb_driver_name[];
 519
 520 extern void musb_start(struct musb *musb);
 521 extern void musb_stop(struct musb *musb);
 522
 523 extern void musb_write_fifo(struct musb_hw_ep *ep, u16 len, const u8 *src);
 524 extern void musb_read_fifo(struct musb_hw_ep *ep, u16 len, u8 *dst);
 525
 526 extern void musb_load_testpacket(struct musb *);
 527
 528 extern irqreturn_t musb_interrupt(struct musb *);
 529
 530 extern void musb_platform_enable(struct musb *musb);
 531 extern void musb_platform_disable(struct musb *musb);
 532
 533 extern void musb_hnp_stop(struct musb *musb);
 534
 535 extern int musb_platform_set_mode(struct musb *musb, u8 musb_mode);
 536
 537 #if defined(CONFIG_USB_TUSB6010) || defined(CONFIG_BLACKFIN) || \
 538         defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP34XX)
 539 extern void musb_platform_try_idle(struct musb *musb, unsigned long timeout);
 540 #else
 541 #define musb_platform_try_idle(x, y)            do {} while (0)
 542 #endif
 543
 544 #if defined(CONFIG_USB_TUSB6010) || defined(CONFIG_BLACKFIN)
 545 extern int musb_platform_get_vbus_status(struct musb *musb);
 546 #else
 547 #define musb_platform_get_vbus_status(x)        0
 548 #endif
 549
 550 extern int __init musb_platform_init(struct musb *musb);
 551 extern int musb_platform_exit(struct musb *musb);
 552
 553 #endif  /* __MUSB_CORE_H__ */