drivers/usb/musb/musb_core.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * MUSB OTG driver defines
   4  *
   5  * Copyright 2005 Mentor Graphics Corporation
   6  * Copyright (C) 2005-2006 by Texas Instruments
   7  * Copyright (C) 2006-2007 Nokia Corporation
   8  */
   9
  10 #ifndef __MUSB_CORE_H__
  11 #define __MUSB_CORE_H__
  12
  13 #include <linux/slab.h>
  14 #include <linux/list.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/errno.h>
  17 #include <linux/timer.h>
  18 #include <linux/device.h>
  19 #include <linux/usb/ch9.h>
  20 #include <linux/usb/gadget.h>
  21 #include <linux/usb.h>
  22 #include <linux/usb/otg.h>
  23 #include <linux/usb/musb.h>
  24 #include <linux/phy/phy.h>
  25 #include <linux/workqueue.h>
  26
  27 struct musb;
  28 struct musb_hw_ep;
  29 struct musb_ep;
  30
  31 /* Helper defines for struct musb->hwvers */
  32 #define MUSB_HWVERS_MAJOR(x)    ((x >> 10) & 0x1f)
  33 #define MUSB_HWVERS_MINOR(x)    (x & 0x3ff)
  34 #define MUSB_HWVERS_RC          0x8000
  35 #define MUSB_HWVERS_1300        0x52C
  36 #define MUSB_HWVERS_1400        0x590
  37 #define MUSB_HWVERS_1800        0x720
  38 #define MUSB_HWVERS_1900        0x784
  39 #define MUSB_HWVERS_2000        0x800
  40
  41 #include "musb_debug.h"
  42 #include "musb_dma.h"
  43
  44 #include "musb_io.h"
  45
  46 #include "musb_gadget.h"
  47 #include <linux/usb/hcd.h>
  48 #include "musb_host.h"
  49
  50 /* NOTE:  otg and peripheral-only state machines start at B_IDLE.
  51  * OTG or host-only go to A_IDLE when ID is sensed.
  52  */
  53 #define is_peripheral_active(m)         (!(m)->is_host)
  54 #define is_host_active(m)               ((m)->is_host)
  55
  56 /****************************** CONSTANTS ********************************/
  57
  58 #ifndef MUSB_C_NUM_EPS
  59 #define MUSB_C_NUM_EPS ((u8)16)
  60 #endif
  61
  62 #ifndef MUSB_MAX_END0_PACKET
  63 #define MUSB_MAX_END0_PACKET ((u16)MUSB_EP0_FIFOSIZE)
  64 #endif
  65
  66 /* host side ep0 states */
  67 enum musb_h_ep0_state {
  68         MUSB_EP0_IDLE,
  69         MUSB_EP0_START,                 /* expect ack of setup */
  70         MUSB_EP0_IN,                    /* expect IN DATA */
  71         MUSB_EP0_OUT,                   /* expect ack of OUT DATA */
  72         MUSB_EP0_STATUS,                /* expect ack of STATUS */
  73 } __attribute__ ((packed));
  74
  75 /* peripheral side ep0 states */
  76 enum musb_g_ep0_state {
  77         MUSB_EP0_STAGE_IDLE,            /* idle, waiting for SETUP */
  78         MUSB_EP0_STAGE_SETUP,           /* received SETUP */
  79         MUSB_EP0_STAGE_TX,              /* IN data */
  80         MUSB_EP0_STAGE_RX,              /* OUT data */
  81         MUSB_EP0_STAGE_STATUSIN,        /* (after OUT data) */
  82         MUSB_EP0_STAGE_STATUSOUT,       /* (after IN data) */
  83         MUSB_EP0_STAGE_ACKWAIT,         /* after zlp, before statusin */
  84 } __attribute__ ((packed));
  85
  86 /*
  87  * OTG protocol constants.  See USB OTG 1.3 spec,
  88  * sections 5.5 "Device Timings" and 6.6.5 "Timers".
  89  */
  90 #define OTG_TIME_A_WAIT_VRISE   100             /* msec (max) */
  91 #define OTG_TIME_A_WAIT_BCON    1100            /* min 1 second */
  92 #define OTG_TIME_A_AIDL_BDIS    200             /* min 200 msec */
  93 #define OTG_TIME_B_ASE0_BRST    100             /* min 3.125 ms */
  94
  95 /****************************** FUNCTIONS ********************************/
  96
  97 #define MUSB_HST_MODE(_musb)\
  98         { (_musb)->is_host = true; }
  99 #define MUSB_DEV_MODE(_musb) \
 100         { (_musb)->is_host = false; }
 101
 102 #define test_devctl_hst_mode(_x) \
 103         (musb_readb((_x)->mregs, MUSB_DEVCTL)&MUSB_DEVCTL_HM)
 104
 105 #define MUSB_MODE(musb) ((musb)->is_host ? "Host" : "Peripheral")
 106
 107 /******************************** TYPES *************************************/
 108
 109 struct musb_io;
 110
 111 /**
 112  * struct musb_platform_ops - Operations passed to musb_core by HW glue layer
 113  * @quirks:     flags for platform specific quirks
 114  * @enable:     enable device
 115  * @disable:    disable device
 116  * @ep_offset:  returns the end point offset
 117  * @ep_select:  selects the specified end point
 118  * @fifo_mode:  sets the fifo mode
 119  * @fifo_offset: returns the fifo offset
 120  * @readb:      read 8 bits
 121  * @writeb:     write 8 bits
 122  * @readw:      read 16 bits
 123  * @writew:     write 16 bits
 124  * @read_fifo:  reads the fifo
 125  * @write_fifo: writes to fifo
 126  * @dma_init:   platform specific dma init function
 127  * @dma_exit:   platform specific dma exit function
 128  * @init:       turns on clocks, sets up platform-specific registers, etc
 129  * @exit:       undoes @init
 130  * @set_mode:   forcefully changes operating mode
 131  * @try_idle:   tries to idle the IP
 132  * @recover:    platform-specific babble recovery
 133  * @vbus_status: returns vbus status if possible
 134  * @set_vbus:   forces vbus status
 135  * @pre_root_reset_end: called before the root usb port reset flag gets cleared
 136  * @post_root_reset_end: called after the root usb port reset flag gets cleared
 137  * @phy_callback: optional callback function for the phy to call
 138  */
 139 struct musb_platform_ops {
 140
 141 #define MUSB_G_NO_SKB_RESERVE   BIT(9)
 142 #define MUSB_DA8XX              BIT(8)
 143 #define MUSB_PRESERVE_SESSION   BIT(7)
 144 #define MUSB_DMA_UX500          BIT(6)
 145 #define MUSB_DMA_CPPI41         BIT(5)
 146 #define MUSB_DMA_CPPI           BIT(4)
 147 #define MUSB_DMA_TUSB_OMAP      BIT(3)
 148 #define MUSB_DMA_INVENTRA       BIT(2)
 149 #define MUSB_IN_TUSB            BIT(1)
 150 #define MUSB_INDEXED_EP         BIT(0)
 151         u32     quirks;
 152
 153         int     (*init)(struct musb *musb);
 154         int     (*exit)(struct musb *musb);
 155
 156         void    (*enable)(struct musb *musb);
 157         void    (*disable)(struct musb *musb);
 158
 159         u32     (*ep_offset)(u8 epnum, u16 offset);
 160         void    (*ep_select)(void __iomem *mbase, u8 epnum);
 161         u16     fifo_mode;
 162         u32     (*fifo_offset)(u8 epnum);
 163         u32     (*busctl_offset)(u8 epnum, u16 offset);
 164         u8      (*readb)(const void __iomem *addr, unsigned offset);
 165         void    (*writeb)(void __iomem *addr, unsigned offset, u8 data);
 166         u16     (*readw)(const void __iomem *addr, unsigned offset);
 167         void    (*writew)(void __iomem *addr, unsigned offset, u16 data);
 168         void    (*read_fifo)(struct musb_hw_ep *hw_ep, u16 len, u8 *buf);
 169         void    (*write_fifo)(struct musb_hw_ep *hw_ep, u16 len, const u8 *buf);
 170         struct dma_controller *
 171                 (*dma_init) (struct musb *musb, void __iomem *base);
 172         void    (*dma_exit)(struct dma_controller *c);
 173         int     (*set_mode)(struct musb *musb, u8 mode);
 174         void    (*try_idle)(struct musb *musb, unsigned long timeout);
 175         int     (*recover)(struct musb *musb);
 176
 177         int     (*vbus_status)(struct musb *musb);
 178         void    (*set_vbus)(struct musb *musb, int on);
 179
 180         void    (*pre_root_reset_end)(struct musb *musb);
 181         void    (*post_root_reset_end)(struct musb *musb);
 182         int     (*phy_callback)(enum musb_vbus_id_status status);
 183         void    (*clear_ep_rxintr)(struct musb *musb, int epnum);
 184 };
 185
 186 /*
 187  * struct musb_hw_ep - endpoint hardware (bidirectional)
 188  *
 189  * Ordered slightly for better cacheline locality.
 190  */
 191 struct musb_hw_ep {
 192         struct musb             *musb;
 193         void __iomem            *fifo;
 194         void __iomem            *regs;
 195
 196 #if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
 197         void __iomem            *conf;
 198 #endif
 199
 200         /* index in musb->endpoints[]  */
 201         u8                      epnum;
 202
 203         /* hardware configuration, possibly dynamic */
 204         bool                    is_shared_fifo;
 205         bool                    tx_double_buffered;
 206         bool                    rx_double_buffered;
 207         u16                     max_packet_sz_tx;
 208         u16                     max_packet_sz_rx;
 209
 210         struct dma_channel      *tx_channel;
 211         struct dma_channel      *rx_channel;
 212
 213 #if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
 214         /* TUSB has "asynchronous" and "synchronous" dma modes */
 215         dma_addr_t              fifo_async;
 216         dma_addr_t              fifo_sync;
 217         void __iomem            *fifo_sync_va;
 218 #endif
 219
 220         /* currently scheduled peripheral endpoint */
 221         struct musb_qh          *in_qh;
 222         struct musb_qh          *out_qh;
 223
 224         u8                      rx_reinit;
 225         u8                      tx_reinit;
 226
 227         /* peripheral side */
 228         struct musb_ep          ep_in;                  /* TX */
 229         struct musb_ep          ep_out;                 /* RX */
 230 };
 231
 232 static inline struct musb_request *next_in_request(struct musb_hw_ep *hw_ep)
 233 {
 234         return next_request(&hw_ep->ep_in);
 235 }
 236
 237 static inline struct musb_request *next_out_request(struct musb_hw_ep *hw_ep)
 238 {
 239         return next_request(&hw_ep->ep_out);
 240 }
 241
 242 struct musb_csr_regs {
 243         /* FIFO registers */
 244         u16 txmaxp, txcsr, rxmaxp, rxcsr;
 245         u16 rxfifoadd, txfifoadd;
 246         u8 txtype, txinterval, rxtype, rxinterval;
 247         u8 rxfifosz, txfifosz;
 248         u8 txfunaddr, txhubaddr, txhubport;
 249         u8 rxfunaddr, rxhubaddr, rxhubport;
 250 };
 251
 252 struct musb_context_registers {
 253
 254         u8 power;
 255         u8 intrusbe;
 256         u16 frame;
 257         u8 index, testmode;
 258
 259         u8 devctl, busctl, misc;
 260         u32 otg_interfsel;
 261
 262         struct musb_csr_regs index_regs[MUSB_C_NUM_EPS];
 263 };
 264
 265 /*
 266  * struct musb - Driver instance data.
 267  */
 268 struct musb {
 269         /* device lock */
 270         spinlock_t              lock;
 271         spinlock_t              list_lock;      /* resume work list lock */
 272
 273         struct musb_io          io;
 274         const struct musb_platform_ops *ops;
 275         struct musb_context_registers context;
 276
 277         irqreturn_t             (*isr)(int, void *);
 278         struct delayed_work     irq_work;
 279         struct delayed_work     deassert_reset_work;
 280         struct delayed_work     finish_resume_work;
 281         struct delayed_work     gadget_work;
 282         u16                     hwvers;
 283
 284         u16                     intrrxe;
 285         u16                     intrtxe;
 286 /* this hub status bit is reserved by USB 2.0 and not seen by usbcore */
 287 #define MUSB_PORT_STAT_RESUME   (1 << 31)
 288
 289         u32                     port1_status;
 290
 291         unsigned long           rh_timer;
 292
 293         enum musb_h_ep0_state   ep0_stage;
 294
 295         /* bulk traffic normally dedicates endpoint hardware, and each
 296          * direction has its own ring of host side endpoints.
 297          * we try to progress the transfer at the head of each endpoint's
 298          * queue until it completes or NAKs too much; then we try the next
 299          * endpoint.
 300          */
 301         struct musb_hw_ep       *bulk_ep;
 302
 303         struct list_head        control;        /* of musb_qh */
 304         struct list_head        in_bulk;        /* of musb_qh */
 305         struct list_head        out_bulk;       /* of musb_qh */
 306         struct list_head        pending_list;   /* pending work list */
 307
 308         struct timer_list       otg_timer;
 309         struct timer_list       dev_timer;
 310         struct notifier_block   nb;
 311
 312         struct dma_controller   *dma_controller;
 313
 314         struct device           *controller;
 315         void __iomem            *ctrl_base;
 316         void __iomem            *mregs;
 317
 318 #if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
 319         dma_addr_t              async;
 320         dma_addr_t              sync;
 321         void __iomem            *sync_va;
 322         u8                      tusb_revision;
 323 #endif
 324
 325         /* passed down from chip/board specific irq handlers */
 326         u8                      int_usb;
 327         u16                     int_rx;
 328         u16                     int_tx;
 329
 330         struct usb_phy          *xceiv;
 331         struct phy              *phy;
 332
 333         int nIrq;
 334         unsigned                irq_wake:1;
 335
 336         struct musb_hw_ep        endpoints[MUSB_C_NUM_EPS];
 337 #define control_ep              endpoints
 338
 339 #define VBUSERR_RETRY_COUNT     3
 340         u16                     vbuserr_retry;
 341         u16 epmask;
 342         u8 nr_endpoints;
 343
 344         int                     (*board_set_power)(int state);
 345
 346         u8                      min_power;      /* vbus for periph, in mA/2 */
 347
 348         enum musb_mode          port_mode;
 349         bool                    session;
 350         unsigned long           quirk_retries;
 351         bool                    is_host;
 352
 353         int                     a_wait_bcon;    /* VBUS timeout in msecs */
 354         unsigned long           idle_timeout;   /* Next timeout in jiffies */
 355
 356         unsigned                is_initialized:1;
 357         unsigned                is_runtime_suspended:1;
 358
 359         /* active means connected and not suspended */
 360         unsigned                is_active:1;
 361
 362         unsigned is_multipoint:1;
 363
 364         unsigned                hb_iso_rx:1;    /* high bandwidth iso rx? */
 365         unsigned                hb_iso_tx:1;    /* high bandwidth iso tx? */
 366         unsigned                dyn_fifo:1;     /* dynamic FIFO supported? */
 367
 368         unsigned                bulk_split:1;
 369 #define can_bulk_split(musb,type) \
 370         (((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_split)
 371
 372         unsigned                bulk_combine:1;
 373 #define can_bulk_combine(musb,type) \
 374         (((type) == USB_ENDPOINT_XFER_BULK) && (musb)->bulk_combine)
 375
 376         /* is_suspended means USB B_PERIPHERAL suspend */
 377         unsigned                is_suspended:1;
 378
 379         /* may_wakeup means remote wakeup is enabled */
 380         unsigned                may_wakeup:1;
 381
 382         /* is_self_powered is reported in device status and the
 383          * config descriptor.  is_bus_powered means B_PERIPHERAL
 384          * draws some VBUS current; both can be true.
 385          */
 386         unsigned                is_self_powered:1;
 387         unsigned                is_bus_powered:1;
 388
 389         unsigned                set_address:1;
 390         unsigned                test_mode:1;
 391         unsigned                softconnect:1;
 392
 393         unsigned                flush_irq_work:1;
 394
 395         u8                      address;
 396         u8                      test_mode_nr;
 397         u16                     ackpend;                /* ep0 */
 398         enum musb_g_ep0_state   ep0_state;
 399         struct usb_gadget       g;                      /* the gadget */
 400         struct usb_gadget_driver *gadget_driver;        /* its driver */
 401         struct usb_hcd          *hcd;                   /* the usb hcd */
 402
 403         const struct musb_hdrc_config *config;
 404
 405         int                     xceiv_old_state;
 406 #ifdef CONFIG_DEBUG_FS
 407         struct dentry           *debugfs_root;
 408 #endif
 409 };
 410
 411 /* This must be included after struct musb is defined */
 412 #include "musb_regs.h"
 413
 414 static inline struct musb *gadget_to_musb(struct usb_gadget *g)
 415 {
 416         return container_of(g, struct musb, g);
 417 }
 418
 419 static inline char *musb_ep_xfertype_string(u8 type)
 420 {
 421         char *s;
 422
 423         switch (type) {
 424         case USB_ENDPOINT_XFER_CONTROL:
 425                 s = "ctrl";
 426                 break;
 427         case USB_ENDPOINT_XFER_ISOC:
 428                 s = "iso";
 429                 break;
 430         case USB_ENDPOINT_XFER_BULK:
 431                 s = "bulk";
 432                 break;
 433         case USB_ENDPOINT_XFER_INT:
 434                 s = "int";
 435                 break;
 436         default:
 437                 s = "";
 438                 break;
 439         }
 440         return s;
 441 }
 442
 443 static inline int musb_read_fifosize(struct musb *musb,
 444                 struct musb_hw_ep *hw_ep, u8 epnum)
 445 {
 446         void __iomem *mbase = musb->mregs;
 447         u8 reg = 0;
 448
 449         /* read from core using indexed model */
 450         reg = musb_readb(mbase, musb->io.ep_offset(epnum, MUSB_FIFOSIZE));
 451         /* 0's returned when no more endpoints */
 452         if (!reg)
 453                 return -ENODEV;
 454
 455         musb->nr_endpoints++;
 456         musb->epmask |= (1 << epnum);
 457
 458         hw_ep->max_packet_sz_tx = 1 << (reg & 0x0f);
 459
 460         /* shared TX/RX FIFO? */
 461         if ((reg & 0xf0) == 0xf0) {
 462                 hw_ep->max_packet_sz_rx = hw_ep->max_packet_sz_tx;
 463                 hw_ep->is_shared_fifo = true;
 464                 return 0;
 465         } else {
 466                 hw_ep->max_packet_sz_rx = 1 << ((reg & 0xf0) >> 4);
 467                 hw_ep->is_shared_fifo = false;
 468         }
 469
 470         return 0;
 471 }
 472
 473 static inline void musb_configure_ep0(struct musb *musb)
 474 {
 475         musb->endpoints[0].max_packet_sz_tx = MUSB_EP0_FIFOSIZE;
 476         musb->endpoints[0].max_packet_sz_rx = MUSB_EP0_FIFOSIZE;
 477         musb->endpoints[0].is_shared_fifo = true;
 478 }
 479
 480 /***************************** Glue it together *****************************/
 481
 482 extern const char musb_driver_name[];
 483
 484 extern void musb_stop(struct musb *musb);
 485 extern void musb_start(struct musb *musb);
 486
 487 extern void musb_write_fifo(struct musb_hw_ep *ep, u16 len, const u8 *src);
 488 extern void musb_read_fifo(struct musb_hw_ep *ep, u16 len, u8 *dst);
 489
 490 extern void musb_load_testpacket(struct musb *);
 491
 492 extern irqreturn_t musb_interrupt(struct musb *);
 493
 494 extern void musb_hnp_stop(struct musb *musb);
 495
 496 int musb_queue_resume_work(struct musb *musb,
 497                            int (*callback)(struct musb *musb, void *data),
 498                            void *data);
 499
 500 static inline void musb_platform_set_vbus(struct musb *musb, int is_on)
 501 {
 502         if (musb->ops->set_vbus)
 503                 musb->ops->set_vbus(musb, is_on);
 504 }
 505
 506 static inline void musb_platform_enable(struct musb *musb)
 507 {
 508         if (musb->ops->enable)
 509                 musb->ops->enable(musb);
 510 }
 511
 512 static inline void musb_platform_disable(struct musb *musb)
 513 {
 514         if (musb->ops->disable)
 515                 musb->ops->disable(musb);
 516 }
 517
 518 static inline int musb_platform_set_mode(struct musb *musb, u8 mode)
 519 {
 520         if (!musb->ops->set_mode)
 521                 return 0;
 522
 523         return musb->ops->set_mode(musb, mode);
 524 }
 525
 526 static inline void musb_platform_try_idle(struct musb *musb,
 527                 unsigned long timeout)
 528 {
 529         if (musb->ops->try_idle)
 530                 musb->ops->try_idle(musb, timeout);
 531 }
 532
 533 static inline int  musb_platform_recover(struct musb *musb)
 534 {
 535         if (!musb->ops->recover)
 536                 return 0;
 537
 538         return musb->ops->recover(musb);
 539 }
 540
 541 static inline int musb_platform_get_vbus_status(struct musb *musb)
 542 {
 543         if (!musb->ops->vbus_status)
 544                 return -EINVAL;
 545
 546         return musb->ops->vbus_status(musb);
 547 }
 548
 549 static inline int musb_platform_init(struct musb *musb)
 550 {
 551         if (!musb->ops->init)
 552                 return -EINVAL;
 553
 554         return musb->ops->init(musb);
 555 }
 556
 557 static inline int musb_platform_exit(struct musb *musb)
 558 {
 559         if (!musb->ops->exit)
 560                 return -EINVAL;
 561
 562         return musb->ops->exit(musb);
 563 }
 564
 565 static inline void musb_platform_pre_root_reset_end(struct musb *musb)
 566 {
 567         if (musb->ops->pre_root_reset_end)
 568                 musb->ops->pre_root_reset_end(musb);
 569 }
 570
 571 static inline void musb_platform_post_root_reset_end(struct musb *musb)
 572 {
 573         if (musb->ops->post_root_reset_end)
 574                 musb->ops->post_root_reset_end(musb);
 575 }
 576
 577 static inline void musb_platform_clear_ep_rxintr(struct musb *musb, int epnum)
 578 {
 579         if (musb->ops->clear_ep_rxintr)
 580                 musb->ops->clear_ep_rxintr(musb, epnum);
 581 }
 582
 583 /*
 584  * gets the "dr_mode" property from DT and converts it into musb_mode
 585  * if the property is not found or not recognized returns MUSB_OTG
 586  */
 587 extern enum musb_mode musb_get_mode(struct device *dev);
 588
 589 #endif  /* __MUSB_CORE_H__ */