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 #ifdef CONFIG_USB_MUSB_SOC
  60 /*
  61  * Get core configuration from a header converted (by cfg_conv)
  62  * from the Verilog config file generated by the core config utility
  63  *
  64  * For now we assume that header is provided along with other
  65  * arch-specific files.  Discrete chips will need a build tweak.
  66  * So will using AHB IDs from silicon that provides them.
  67  */
  68 #include <asm/arch/hdrc_cnf.h>
  69 #endif
  70
  71 #include "musb_io.h"
  72 #include "musb_regs.h"
  73
  74 #include "musb_gadget.h"
  75 #include "../core/hcd.h"
  76 #include "musb_host.h"
  77
  78
  79
  80 #ifdef CONFIG_USB_MUSB_OTG
  81
  82 #define is_peripheral_enabled(musb)     ((musb)->board_mode != MUSB_HOST)
  83 #define is_host_enabled(musb)           ((musb)->board_mode != MUSB_PERIPHERAL)
  84 #define is_otg_enabled(musb)            ((musb)->board_mode == MUSB_OTG)
  85
  86 /* NOTE:  otg and peripheral-only state machines start at B_IDLE.
  87  * OTG or host-only go to A_IDLE when ID is sensed.
  88  */
  89 #define is_peripheral_active(m)         (!(m)->is_host)
  90 #define is_host_active(m)               ((m)->is_host)
  91
  92 #else
  93 #define is_peripheral_enabled(musb)     is_peripheral_capable()
  94 #define is_host_enabled(musb)           is_host_capable()
  95 #define is_otg_enabled(musb)            0
  96
  97 #define is_peripheral_active(musb)      is_peripheral_capable()
  98 #define is_host_active(musb)            is_host_capable()
  99 #endif
 100
 101 #if defined(CONFIG_USB_MUSB_OTG) || defined(CONFIG_USB_MUSB_PERIPHERAL)
 102 /* for some reason, the "select USB_GADGET_MUSB_HDRC" doesn't always
 103  * override that choice selection (often USB_GADGET_DUMMY_HCD).
 104  */
 105 #ifndef CONFIG_USB_GADGET_MUSB_HDRC
 106 #error bogus Kconfig output ... select CONFIG_USB_GADGET_MUSB_HDRC
 107 #endif
 108 #endif  /* need MUSB gadget selection */
 109
 110
 111 #ifdef CONFIG_PROC_FS
 112 #include <linux/fs.h>
 113 #define MUSB_CONFIG_PROC_FS
 114 #endif
 115
 116 /****************************** PERIPHERAL ROLE *****************************/
 117
 118 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 119
 120 #define is_peripheral_capable() (1)
 121
 122 extern irqreturn_t musb_g_ep0_irq(struct musb *);
 123 extern void musb_g_tx(struct musb *, u8);
 124 extern void musb_g_rx(struct musb *, u8);
 125 extern void musb_g_reset(struct musb *);
 126 extern void musb_g_suspend(struct musb *);
 127 extern void musb_g_resume(struct musb *);
 128 extern void musb_g_wakeup(struct musb *);
 129 extern void musb_g_disconnect(struct musb *);
 130
 131 #else
 132
 133 #define is_peripheral_capable() (0)
 134
 135 static inline irqreturn_t musb_g_ep0_irq(struct musb *m) { return IRQ_NONE; }
 136 static inline void musb_g_reset(struct musb *m) {}
 137 static inline void musb_g_suspend(struct musb *m) {}
 138 static inline void musb_g_resume(struct musb *m) {}
 139 static inline void musb_g_wakeup(struct musb *m) {}
 140 static inline void musb_g_disconnect(struct musb *m) {}
 141
 142 #endif
 143
 144 /****************************** HOST ROLE ***********************************/
 145
 146 #ifdef CONFIG_USB_MUSB_HDRC_HCD
 147
 148 #define is_host_capable()       (1)
 149
 150 extern irqreturn_t musb_h_ep0_irq(struct musb *);
 151 extern void musb_host_tx(struct musb *, u8);
 152 extern void musb_host_rx(struct musb *, u8);
 153
 154 #else
 155
 156 #define is_host_capable()       (0)
 157
 158 static inline irqreturn_t musb_h_ep0_irq(struct musb *m) { return IRQ_NONE; }
 159 static inline void musb_host_tx(struct musb *m, u8 e) {}
 160 static inline void musb_host_rx(struct musb *m, u8 e) {}
 161
 162 #endif
 163
 164
 165 /****************************** CONSTANTS ********************************/
 166
 167 #ifndef MUSB_C_NUM_EPS
 168 #define MUSB_C_NUM_EPS ((u8)16)
 169 #endif
 170
 171 #ifndef MUSB_MAX_END0_PACKET
 172 #define MUSB_MAX_END0_PACKET ((u16)MUSB_EP0_FIFOSIZE)
 173 #endif
 174
 175 /* host side ep0 states */
 176 enum musb_h_ep0_state {
 177         MUSB_EP0_IDLE,
 178         MUSB_EP0_START,                 /* expect ack of setup */
 179         MUSB_EP0_IN,                    /* expect IN DATA */
 180         MUSB_EP0_OUT,                   /* expect ack of OUT DATA */
 181         MUSB_EP0_STATUS,                /* expect ack of STATUS */
 182 } __attribute__ ((packed));
 183
 184 /* peripheral side ep0 states */
 185 enum musb_g_ep0_state {
 186         MUSB_EP0_STAGE_SETUP,           /* idle, waiting for setup */
 187         MUSB_EP0_STAGE_TX,              /* IN data */
 188         MUSB_EP0_STAGE_RX,              /* OUT data */
 189         MUSB_EP0_STAGE_STATUSIN,        /* (after OUT data) */
 190         MUSB_EP0_STAGE_STATUSOUT,       /* (after IN data) */
 191         MUSB_EP0_STAGE_ACKWAIT,         /* after zlp, before statusin */
 192 } __attribute__ ((packed));
 193
 194 /* OTG protocol constants */
 195 #define OTG_TIME_A_WAIT_VRISE   100             /* msec (max) */
 196 #define OTG_TIME_A_WAIT_BCON    0               /* 0=infinite; min 1000 msec */
 197 #define OTG_TIME_A_IDLE_BDIS    200             /* msec (min) */
 198
 199 /*************************** REGISTER ACCESS ********************************/
 200
 201 /* Endpoint registers (other than dynfifo setup) can be accessed either
 202  * directly with the "flat" model, or after setting up an index register.
 203  */
 204
 205 #if defined(CONFIG_ARCH_DAVINCI) || defined(CONFIG_ARCH_OMAP2430) \
 206                 || defined(CONFIG_ARCH_OMAP3430)
 207 /* REVISIT indexed access seemed to
 208  * misbehave (on DaVinci) for at least peripheral IN ...
 209  */
 210 #define MUSB_FLAT_REG
 211 #endif
 212
 213 /* TUSB mapping: "flat" plus ep0 special cases */
 214 #if     defined(CONFIG_USB_TUSB6010)
 215 #define musb_ep_select(_mbase, _epnum) \
 216         musb_writeb((_mbase), MUSB_INDEX, (_epnum))
 217 #define MUSB_EP_OFFSET                  MUSB_TUSB_OFFSET
 218
 219 /* "flat" mapping: each endpoint has its own i/o address */
 220 #elif   defined(MUSB_FLAT_REG)
 221 #define musb_ep_select(_mbase, _epnum)  (((void)(_mbase)), ((void)(_epnum)))
 222 #define MUSB_EP_OFFSET                  MUSB_FLAT_OFFSET
 223
 224 /* "indexed" mapping: INDEX register controls register bank select */
 225 #else
 226 #define musb_ep_select(_mbase, _epnum) \
 227         musb_writeb((_mbase), MUSB_INDEX, (_epnum))
 228 #define MUSB_EP_OFFSET                  MUSB_INDEXED_OFFSET
 229 #endif
 230
 231 /****************************** FUNCTIONS ********************************/
 232
 233 #define MUSB_HST_MODE(_musb)\
 234         { (_musb)->is_host = true; }
 235 #define MUSB_DEV_MODE(_musb) \
 236         { (_musb)->is_host = false; }
 237
 238 #define test_devctl_hst_mode(_x) \
 239         (musb_readb((_x)->mregs, MUSB_DEVCTL)&MUSB_DEVCTL_HM)
 240
 241 #define MUSB_MODE(musb) ((musb)->is_host ? "Host" : "Peripheral")
 242
 243 /******************************** TYPES *************************************/
 244
 245 /*
 246  * struct musb_hw_ep - endpoint hardware (bidirectional)
 247  *
 248  * Ordered slightly for better cacheline locality.
 249  */
 250 struct musb_hw_ep {
 251         struct musb             *musb;
 252         void __iomem            *fifo;
 253         void __iomem            *regs;
 254
 255 #ifdef CONFIG_USB_TUSB6010
 256         void __iomem            *conf;
 257 #endif
 258
 259         /* index in musb->endpoints[]  */
 260         u8                      epnum;
 261
 262         /* hardware configuration, possibly dynamic */
 263         bool                    is_shared_fifo;
 264         bool                    tx_double_buffered;
 265         bool                    rx_double_buffered;
 266         u16                     max_packet_sz_tx;
 267         u16                     max_packet_sz_rx;
 268
 269         struct dma_channel      *tx_channel;
 270         struct dma_channel      *rx_channel;
 271
 272 #ifdef CONFIG_USB_TUSB6010
 273         /* TUSB has "asynchronous" and "synchronous" dma modes */
 274         dma_addr_t              fifo_async;
 275         dma_addr_t              fifo_sync;
 276         void __iomem            *fifo_sync_va;
 277 #endif
 278
 279 #ifdef CONFIG_USB_MUSB_HDRC_HCD
 280         void __iomem            *target_regs;
 281
 282         /* currently scheduled peripheral endpoint */
 283         struct musb_qh          *in_qh;
 284         struct musb_qh          *out_qh;
 285
 286         u8                      rx_reinit;
 287         u8                      tx_reinit;
 288 #endif
 289
 290 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 291         /* peripheral side */
 292         struct musb_ep          ep_in;                  /* TX */
 293         struct musb_ep          ep_out;                 /* RX */
 294 #endif
 295 };
 296
 297 static inline struct usb_request *next_in_request(struct musb_hw_ep *hw_ep)
 298 {
 299 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 300         return next_request(&hw_ep->ep_in);
 301 #else
 302         return NULL;
 303 #endif
 304 }
 305
 306 static inline struct usb_request *next_out_request(struct musb_hw_ep *hw_ep)
 307 {
 308 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 309         return next_request(&hw_ep->ep_out);
 310 #else
 311         return NULL;
 312 #endif
 313 }
 314
 315 /*
 316  * struct musb - Driver instance data.
 317  */
 318 struct musb {
 319         spinlock_t              lock;
 320         struct clk              *clock;
 321         irqreturn_t             (*isr)(int, void *);
 322         struct work_struct      irq_work;
 323
 324 /* this hub status bit is reserved by USB 2.0 and not seen by usbcore */
 325 #define MUSB_PORT_STAT_RESUME   (1 << 31)
 326
 327         u32                     port1_status;
 328
 329 #ifdef CONFIG_USB_MUSB_HDRC_HCD
 330         unsigned long           rh_timer;
 331
 332         enum musb_h_ep0_state   ep0_stage;
 333
 334         /* bulk traffic normally dedicates endpoint hardware, and each
 335          * direction has its own ring of host side endpoints.
 336          * we try to progress the transfer at the head of each endpoint's
 337          * queue until it completes or NAKs too much; then we try the next
 338          * endpoint.
 339          */
 340         struct musb_hw_ep       *bulk_ep;
 341
 342         struct list_head        control;        /* of musb_qh */
 343         struct list_head        in_bulk;        /* of musb_qh */
 344         struct list_head        out_bulk;       /* of musb_qh */
 345         struct musb_qh          *periodic[32];  /* tree of interrupt+iso */
 346 #endif
 347
 348         /* called with IRQs blocked; ON/nonzero implies starting a session,
 349          * and waiting at least a_wait_vrise_tmout.
 350          */
 351         void                    (*board_set_vbus)(struct musb *, int is_on);
 352
 353         struct dma_controller   *dma_controller;
 354
 355         struct device           *controller;
 356         void __iomem            *ctrl_base;
 357         void __iomem            *mregs;
 358
 359 #ifdef CONFIG_USB_TUSB6010
 360         dma_addr_t              async;
 361         dma_addr_t              sync;
 362         void __iomem            *sync_va;
 363 #endif
 364
 365         /* passed down from chip/board specific irq handlers */
 366         u8                      int_usb;
 367         u16                     int_rx;
 368         u16                     int_tx;
 369
 370         struct otg_transceiver  xceiv;
 371
 372         int nIrq;
 373
 374         struct musb_hw_ep        endpoints[MUSB_C_NUM_EPS];
 375 #define control_ep              endpoints
 376
 377 #define VBUSERR_RETRY_COUNT     3
 378         u16                     vbuserr_retry;
 379         u16 epmask;
 380         u8 nr_endpoints;
 381
 382         u8 board_mode;          /* enum musb_mode */
 383         int                     (*board_set_power)(int state);
 384
 385         int                     (*set_clock)(struct clk *clk, int is_active);
 386
 387         u8                      min_power;      /* vbus for periph, in mA/2 */
 388
 389         bool                    is_host;
 390
 391         int                     a_wait_bcon;    /* VBUS timeout in msecs */
 392         unsigned long           idle_timeout;   /* Next timeout in jiffies */
 393
 394         /* active means connected and not suspended */
 395         unsigned                is_active:1;
 396
 397         unsigned is_multipoint:1;
 398         unsigned ignore_disconnect:1;   /* during bus resets */
 399
 400 #ifdef C_MP_TX
 401         unsigned bulk_split:1;
 402 #define can_bulk_split(musb,type) \
 403                 (((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_split)
 404 #else
 405 #define can_bulk_split(musb, type)      0
 406 #endif
 407
 408 #ifdef C_MP_RX
 409         unsigned bulk_combine:1;
 410 #define can_bulk_combine(musb,type) \
 411                 (((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_combine)
 412 #else
 413 #define can_bulk_combine(musb, type)    0
 414 #endif
 415
 416 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 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 #endif
 441
 442 #ifdef MUSB_CONFIG_PROC_FS
 443         struct proc_dir_entry *proc_entry;
 444 #endif
 445 };
 446
 447 static inline void musb_set_vbus(struct musb *musb, int is_on)
 448 {
 449         musb->board_set_vbus(musb, is_on);
 450 }
 451
 452 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 453 static inline struct musb *gadget_to_musb(struct usb_gadget *g)
 454 {
 455         return container_of(g, struct musb, g);
 456 }
 457 #endif
 458
 459
 460 /***************************** Glue it together *****************************/
 461
 462 extern const char musb_driver_name[];
 463
 464 extern void musb_start(struct musb *musb);
 465 extern void musb_stop(struct musb *musb);
 466
 467 extern void musb_write_fifo(struct musb_hw_ep *ep, u16 len, const u8 *src);
 468 extern void musb_read_fifo(struct musb_hw_ep *ep, u16 len, u8 *dst);
 469
 470 extern void musb_load_testpacket(struct musb *);
 471
 472 extern irqreturn_t musb_interrupt(struct musb *);
 473
 474 extern void musb_platform_enable(struct musb *musb);
 475 extern void musb_platform_disable(struct musb *musb);
 476
 477 extern void musb_hnp_stop(struct musb *musb);
 478
 479 extern void musb_platform_set_mode(struct musb *musb, u8 musb_mode);
 480
 481 #if defined(CONFIG_USB_TUSB6010) || \
 482         defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP34XX)
 483 extern void musb_platform_try_idle(struct musb *musb, unsigned long timeout);
 484 #else
 485 #define musb_platform_try_idle(x, y)            do {} while (0)
 486 #endif
 487
 488 #ifdef CONFIG_USB_TUSB6010
 489 extern int musb_platform_get_vbus_status(struct musb *musb);
 490 #else
 491 #define musb_platform_get_vbus_status(x)        0
 492 #endif
 493
 494 extern int __init musb_platform_init(struct musb *musb);
 495 extern int musb_platform_exit(struct musb *musb);
 496
 497 /*-------------------------- ProcFS definitions ---------------------*/
 498
 499 struct proc_dir_entry;
 500
 501 #if (MUSB_DEBUG > 0) && defined(MUSB_CONFIG_PROC_FS)
 502 extern struct proc_dir_entry *musb_debug_create(char *name, struct musb *data);
 503 extern void musb_debug_delete(char *name, struct musb *data);
 504
 505 #else
 506 static inline struct proc_dir_entry *
 507 musb_debug_create(char *name, struct musb *data)
 508 {
 509         return NULL;
 510 }
 511 static inline void musb_debug_delete(char *name, struct musb *data)
 512 {
 513 }
 514 #endif
 515
 516 #endif  /* __MUSB_CORE_H__ */