1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * isp1301_omap - ISP 1301 USB transceiver, talking to OMAP OTG controller 4 * 5 * Copyright (C) 2004 Texas Instruments 6 * Copyright (C) 2004 David Brownell 7 */ 8 9#include <linux/kernel.h> 10#include <linux/module.h> 11#include <linux/init.h> 12#include <linux/slab.h> 13#include <linux/interrupt.h> 14#include <linux/platform_device.h> 15#include <linux/gpio.h> 16#include <linux/usb/ch9.h> 17#include <linux/usb/gadget.h> 18#include <linux/usb.h> 19#include <linux/usb/otg.h> 20#include <linux/i2c.h> 21#include <linux/workqueue.h> 22 23#include <asm/irq.h> 24#include <asm/mach-types.h> 25 26#include <mach/mux.h> 27 28#include <mach/usb.h> 29 30#undef VERBOSE 31 32 33#define DRIVER_VERSION "24 August 2004" 34#define DRIVER_NAME (isp1301_driver.driver.name) 35 36MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver"); 37MODULE_LICENSE("GPL"); 38 39struct isp1301 { 40 struct usb_phy phy; 41 struct i2c_client *client; 42 void (*i2c_release)(struct device *dev); 43 44 int irq_type; 45 46 u32 last_otg_ctrl; 47 unsigned working:1; 48 49 struct timer_list timer; 50 51 /* use keventd context to change the state for us */ 52 struct work_struct work; 53 54 unsigned long todo; 55# define WORK_UPDATE_ISP 0 /* update ISP from OTG */ 56# define WORK_UPDATE_OTG 1 /* update OTG from ISP */ 57# define WORK_HOST_RESUME 4 /* resume host */ 58# define WORK_TIMER 6 /* timer fired */ 59# define WORK_STOP 7 /* don't resubmit */ 60}; 61 62 63/* bits in OTG_CTRL */ 64 65#define OTG_XCEIV_OUTPUTS \ 66 (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID) 67#define OTG_XCEIV_INPUTS \ 68 (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID) 69#define OTG_CTRL_BITS \ 70 (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP) 71 /* and OTG_PULLUP is sometimes written */ 72 73#define OTG_CTRL_MASK (OTG_DRIVER_SEL| \ 74 OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \ 75 OTG_CTRL_BITS) 76 77 78/*-------------------------------------------------------------------------*/ 79 80/* board-specific PM hooks */ 81 82#if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3) 83 84#if IS_REACHABLE(CONFIG_TPS65010) 85 86#include <linux/mfd/tps65010.h> 87 88#else 89 90static inline int tps65010_set_vbus_draw(unsigned mA) 91{ 92 pr_debug("tps65010: draw %d mA (STUB)\n", mA); 93 return 0; 94} 95 96#endif 97 98static void enable_vbus_draw(struct isp1301 *isp, unsigned mA) 99{ 100 int status = tps65010_set_vbus_draw(mA); 101 if (status < 0) 102 pr_debug(" VBUS %d mA error %d\n", mA, status); 103} 104 105#else 106 107static void enable_vbus_draw(struct isp1301 *isp, unsigned mA) 108{ 109 /* H4 controls this by DIP switch S2.4; no soft control. 110 * ON means the charger is always enabled. Leave it OFF 111 * unless the OTG port is used only in B-peripheral mode. 112 */ 113} 114 115#endif 116 117static void enable_vbus_source(struct isp1301 *isp) 118{ 119 /* this board won't supply more than 8mA vbus power. 120 * some boards can switch a 100ma "unit load" (or more). 121 */ 122} 123 124 125/* products will deliver OTG messages with LEDs, GUI, etc */ 126static inline void notresponding(struct isp1301 *isp) 127{ 128 printk(KERN_NOTICE "OTG device not responding.\n"); 129} 130 131 132/*-------------------------------------------------------------------------*/ 133 134static struct i2c_driver isp1301_driver; 135 136/* smbus apis are used for portability */ 137 138static inline u8 139isp1301_get_u8(struct isp1301 *isp, u8 reg) 140{ 141 return i2c_smbus_read_byte_data(isp->client, reg + 0); 142} 143 144static inline int 145isp1301_get_u16(struct isp1301 *isp, u8 reg) 146{ 147 return i2c_smbus_read_word_data(isp->client, reg); 148} 149 150static inline int 151isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits) 152{ 153 return i2c_smbus_write_byte_data(isp->client, reg + 0, bits); 154} 155 156static inline int 157isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits) 158{ 159 return i2c_smbus_write_byte_data(isp->client, reg + 1, bits); 160} 161 162/*-------------------------------------------------------------------------*/ 163 164/* identification */ 165#define ISP1301_VENDOR_ID 0x00 /* u16 read */ 166#define ISP1301_PRODUCT_ID 0x02 /* u16 read */ 167#define ISP1301_BCD_DEVICE 0x14 /* u16 read */ 168 169#define I2C_VENDOR_ID_PHILIPS 0x04cc 170#define I2C_PRODUCT_ID_PHILIPS_1301 0x1301 171 172/* operational registers */ 173#define ISP1301_MODE_CONTROL_1 0x04 /* u8 read, set, +1 clear */ 174# define MC1_SPEED (1 << 0) 175# define MC1_SUSPEND (1 << 1) 176# define MC1_DAT_SE0 (1 << 2) 177# define MC1_TRANSPARENT (1 << 3) 178# define MC1_BDIS_ACON_EN (1 << 4) 179# define MC1_OE_INT_EN (1 << 5) 180# define MC1_UART_EN (1 << 6) 181# define MC1_MASK 0x7f 182#define ISP1301_MODE_CONTROL_2 0x12 /* u8 read, set, +1 clear */ 183# define MC2_GLOBAL_PWR_DN (1 << 0) 184# define MC2_SPD_SUSP_CTRL (1 << 1) 185# define MC2_BI_DI (1 << 2) 186# define MC2_TRANSP_BDIR0 (1 << 3) 187# define MC2_TRANSP_BDIR1 (1 << 4) 188# define MC2_AUDIO_EN (1 << 5) 189# define MC2_PSW_EN (1 << 6) 190# define MC2_EN2V7 (1 << 7) 191#define ISP1301_OTG_CONTROL_1 0x06 /* u8 read, set, +1 clear */ 192# define OTG1_DP_PULLUP (1 << 0) 193# define OTG1_DM_PULLUP (1 << 1) 194# define OTG1_DP_PULLDOWN (1 << 2) 195# define OTG1_DM_PULLDOWN (1 << 3) 196# define OTG1_ID_PULLDOWN (1 << 4) 197# define OTG1_VBUS_DRV (1 << 5) 198# define OTG1_VBUS_DISCHRG (1 << 6) 199# define OTG1_VBUS_CHRG (1 << 7) 200#define ISP1301_OTG_STATUS 0x10 /* u8 readonly */ 201# define OTG_B_SESS_END (1 << 6) 202# define OTG_B_SESS_VLD (1 << 7) 203 204#define ISP1301_INTERRUPT_SOURCE 0x08 /* u8 read */ 205#define ISP1301_INTERRUPT_LATCH 0x0A /* u8 read, set, +1 clear */ 206 207#define ISP1301_INTERRUPT_FALLING 0x0C /* u8 read, set, +1 clear */ 208#define ISP1301_INTERRUPT_RISING 0x0E /* u8 read, set, +1 clear */ 209 210/* same bitfields in all interrupt registers */ 211# define INTR_VBUS_VLD (1 << 0) 212# define INTR_SESS_VLD (1 << 1) 213# define INTR_DP_HI (1 << 2) 214# define INTR_ID_GND (1 << 3) 215# define INTR_DM_HI (1 << 4) 216# define INTR_ID_FLOAT (1 << 5) 217# define INTR_BDIS_ACON (1 << 6) 218# define INTR_CR_INT (1 << 7) 219 220/*-------------------------------------------------------------------------*/ 221 222static inline const char *state_name(struct isp1301 *isp) 223{ 224 return usb_otg_state_string(isp->phy.otg->state); 225} 226 227/*-------------------------------------------------------------------------*/ 228 229/* NOTE: some of this ISP1301 setup is specific to H2 boards; 230 * not everything is guarded by board-specific checks, or even using 231 * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI. 232 * 233 * ALSO: this currently doesn't use ISP1301 low-power modes 234 * while OTG is running. 235 */ 236 237static void power_down(struct isp1301 *isp) 238{ 239 isp->phy.otg->state = OTG_STATE_UNDEFINED; 240 241 // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN); 242 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND); 243 244 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN); 245 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0); 246} 247 248static void __maybe_unused power_up(struct isp1301 *isp) 249{ 250 // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN); 251 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND); 252 253 /* do this only when cpu is driving transceiver, 254 * so host won't see a low speed device... 255 */ 256 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0); 257} 258 259#define NO_HOST_SUSPEND 260 261static int host_suspend(struct isp1301 *isp) 262{ 263#ifdef NO_HOST_SUSPEND 264 return 0; 265#else 266 struct device *dev; 267 268 if (!isp->phy.otg->host) 269 return -ENODEV; 270 271 /* Currently ASSUMES only the OTG port matters; 272 * other ports could be active... 273 */ 274 dev = isp->phy.otg->host->controller; 275 return dev->driver->suspend(dev, 3, 0); 276#endif 277} 278 279static int host_resume(struct isp1301 *isp) 280{ 281#ifdef NO_HOST_SUSPEND 282 return 0; 283#else 284 struct device *dev; 285 286 if (!isp->phy.otg->host) 287 return -ENODEV; 288 289 dev = isp->phy.otg->host->controller; 290 return dev->driver->resume(dev, 0); 291#endif 292} 293 294static int gadget_suspend(struct isp1301 *isp) 295{ 296 isp->phy.otg->gadget->b_hnp_enable = 0; 297 isp->phy.otg->gadget->a_hnp_support = 0; 298 isp->phy.otg->gadget->a_alt_hnp_support = 0; 299 return usb_gadget_vbus_disconnect(isp->phy.otg->gadget); 300} 301 302/*-------------------------------------------------------------------------*/ 303 304#define TIMER_MINUTES 10 305#define TIMER_JIFFIES (TIMER_MINUTES * 60 * HZ) 306 307/* Almost all our I2C messaging comes from a work queue's task context. 308 * NOTE: guaranteeing certain response times might mean we shouldn't 309 * share keventd's work queue; a realtime task might be safest. 310 */ 311static void isp1301_defer_work(struct isp1301 *isp, int work) 312{ 313 int status; 314 315 if (isp && !test_and_set_bit(work, &isp->todo)) { 316 (void) get_device(&isp->client->dev); 317 status = schedule_work(&isp->work); 318 if (!status && !isp->working) 319 dev_vdbg(&isp->client->dev, 320 "work item %d may be lost\n", work); 321 } 322} 323 324/* called from irq handlers */ 325static void a_idle(struct isp1301 *isp, const char *tag) 326{ 327 u32 l; 328 329 if (isp->phy.otg->state == OTG_STATE_A_IDLE) 330 return; 331 332 isp->phy.otg->default_a = 1; 333 if (isp->phy.otg->host) { 334 isp->phy.otg->host->is_b_host = 0; 335 host_suspend(isp); 336 } 337 if (isp->phy.otg->gadget) { 338 isp->phy.otg->gadget->is_a_peripheral = 1; 339 gadget_suspend(isp); 340 } 341 isp->phy.otg->state = OTG_STATE_A_IDLE; 342 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS; 343 omap_writel(l, OTG_CTRL); 344 isp->last_otg_ctrl = l; 345 pr_debug(" --> %s/%s\n", state_name(isp), tag); 346} 347 348/* called from irq handlers */ 349static void b_idle(struct isp1301 *isp, const char *tag) 350{ 351 u32 l; 352 353 if (isp->phy.otg->state == OTG_STATE_B_IDLE) 354 return; 355 356 isp->phy.otg->default_a = 0; 357 if (isp->phy.otg->host) { 358 isp->phy.otg->host->is_b_host = 1; 359 host_suspend(isp); 360 } 361 if (isp->phy.otg->gadget) { 362 isp->phy.otg->gadget->is_a_peripheral = 0; 363 gadget_suspend(isp); 364 } 365 isp->phy.otg->state = OTG_STATE_B_IDLE; 366 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS; 367 omap_writel(l, OTG_CTRL); 368 isp->last_otg_ctrl = l; 369 pr_debug(" --> %s/%s\n", state_name(isp), tag); 370} 371 372static void 373dump_regs(struct isp1301 *isp, const char *label) 374{ 375 u8 ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1); 376 u8 status = isp1301_get_u8(isp, ISP1301_OTG_STATUS); 377 u8 src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE); 378 379 pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n", 380 omap_readl(OTG_CTRL), label, state_name(isp), 381 ctrl, status, src); 382 /* mode control and irq enables don't change much */ 383} 384 385/*-------------------------------------------------------------------------*/ 386 387#ifdef CONFIG_USB_OTG 388 389/* 390 * The OMAP OTG controller handles most of the OTG state transitions. 391 * 392 * We translate isp1301 outputs (mostly voltage comparator status) into 393 * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state 394 * flags into isp1301 inputs ... and infer state transitions. 395 */ 396 397#ifdef VERBOSE 398 399static void check_state(struct isp1301 *isp, const char *tag) 400{ 401 enum usb_otg_state state = OTG_STATE_UNDEFINED; 402 u8 fsm = omap_readw(OTG_TEST) & 0x0ff; 403 unsigned extra = 0; 404 405 switch (fsm) { 406 407 /* default-b */ 408 case 0x0: 409 state = OTG_STATE_B_IDLE; 410 break; 411 case 0x3: 412 case 0x7: 413 extra = 1; 414 case 0x1: 415 state = OTG_STATE_B_PERIPHERAL; 416 break; 417 case 0x11: 418 state = OTG_STATE_B_SRP_INIT; 419 break; 420 421 /* extra dual-role default-b states */ 422 case 0x12: 423 case 0x13: 424 case 0x16: 425 extra = 1; 426 case 0x17: 427 state = OTG_STATE_B_WAIT_ACON; 428 break; 429 case 0x34: 430 state = OTG_STATE_B_HOST; 431 break; 432 433 /* default-a */ 434 case 0x36: 435 state = OTG_STATE_A_IDLE; 436 break; 437 case 0x3c: 438 state = OTG_STATE_A_WAIT_VFALL; 439 break; 440 case 0x7d: 441 state = OTG_STATE_A_VBUS_ERR; 442 break; 443 case 0x9e: 444 case 0x9f: 445 extra = 1; 446 case 0x89: 447 state = OTG_STATE_A_PERIPHERAL; 448 break; 449 case 0xb7: 450 state = OTG_STATE_A_WAIT_VRISE; 451 break; 452 case 0xb8: 453 state = OTG_STATE_A_WAIT_BCON; 454 break; 455 case 0xb9: 456 state = OTG_STATE_A_HOST; 457 break; 458 case 0xba: 459 state = OTG_STATE_A_SUSPEND; 460 break; 461 default: 462 break; 463 } 464 if (isp->phy.otg->state == state && !extra) 465 return; 466 pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag, 467 usb_otg_state_string(state), fsm, state_name(isp), 468 omap_readl(OTG_CTRL)); 469} 470 471#else 472 473static inline void check_state(struct isp1301 *isp, const char *tag) { } 474 475#endif 476 477/* outputs from ISP1301_INTERRUPT_SOURCE */ 478static void update_otg1(struct isp1301 *isp, u8 int_src) 479{ 480 u32 otg_ctrl; 481 482 otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK; 483 otg_ctrl &= ~OTG_XCEIV_INPUTS; 484 otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD); 485 486 if (int_src & INTR_SESS_VLD) 487 otg_ctrl |= OTG_ASESSVLD; 488 else if (isp->phy.otg->state == OTG_STATE_A_WAIT_VFALL) { 489 a_idle(isp, "vfall"); 490 otg_ctrl &= ~OTG_CTRL_BITS; 491 } 492 if (int_src & INTR_VBUS_VLD) 493 otg_ctrl |= OTG_VBUSVLD; 494 if (int_src & INTR_ID_GND) { /* default-A */ 495 if (isp->phy.otg->state == OTG_STATE_B_IDLE 496 || isp->phy.otg->state 497 == OTG_STATE_UNDEFINED) { 498 a_idle(isp, "init"); 499 return; 500 } 501 } else { /* default-B */ 502 otg_ctrl |= OTG_ID; 503 if (isp->phy.otg->state == OTG_STATE_A_IDLE 504 || isp->phy.otg->state == OTG_STATE_UNDEFINED) { 505 b_idle(isp, "init"); 506 return; 507 } 508 } 509 omap_writel(otg_ctrl, OTG_CTRL); 510} 511 512/* outputs from ISP1301_OTG_STATUS */ 513static void update_otg2(struct isp1301 *isp, u8 otg_status) 514{ 515 u32 otg_ctrl; 516 517 otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK; 518 otg_ctrl &= ~OTG_XCEIV_INPUTS; 519 otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND); 520 if (otg_status & OTG_B_SESS_VLD) 521 otg_ctrl |= OTG_BSESSVLD; 522 else if (otg_status & OTG_B_SESS_END) 523 otg_ctrl |= OTG_BSESSEND; 524 omap_writel(otg_ctrl, OTG_CTRL); 525} 526 527/* inputs going to ISP1301 */ 528static void otg_update_isp(struct isp1301 *isp) 529{ 530 u32 otg_ctrl, otg_change; 531 u8 set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP; 532 533 otg_ctrl = omap_readl(OTG_CTRL); 534 otg_change = otg_ctrl ^ isp->last_otg_ctrl; 535 isp->last_otg_ctrl = otg_ctrl; 536 otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS; 537 538 switch (isp->phy.otg->state) { 539 case OTG_STATE_B_IDLE: 540 case OTG_STATE_B_PERIPHERAL: 541 case OTG_STATE_B_SRP_INIT: 542 if (!(otg_ctrl & OTG_PULLUP)) { 543 // if (otg_ctrl & OTG_B_HNPEN) { 544 if (isp->phy.otg->gadget->b_hnp_enable) { 545 isp->phy.otg->state = OTG_STATE_B_WAIT_ACON; 546 pr_debug(" --> b_wait_acon\n"); 547 } 548 goto pulldown; 549 } 550pullup: 551 set |= OTG1_DP_PULLUP; 552 clr |= OTG1_DP_PULLDOWN; 553 break; 554 case OTG_STATE_A_SUSPEND: 555 case OTG_STATE_A_PERIPHERAL: 556 if (otg_ctrl & OTG_PULLUP) 557 goto pullup; 558 /* FALLTHROUGH */ 559 // case OTG_STATE_B_WAIT_ACON: 560 default: 561pulldown: 562 set |= OTG1_DP_PULLDOWN; 563 clr |= OTG1_DP_PULLUP; 564 break; 565 } 566 567# define toggle(OTG,ISP) do { \ 568 if (otg_ctrl & OTG) set |= ISP; \ 569 else clr |= ISP; \ 570 } while (0) 571 572 if (!(isp->phy.otg->host)) 573 otg_ctrl &= ~OTG_DRV_VBUS; 574 575 switch (isp->phy.otg->state) { 576 case OTG_STATE_A_SUSPEND: 577 if (otg_ctrl & OTG_DRV_VBUS) { 578 set |= OTG1_VBUS_DRV; 579 break; 580 } 581 /* HNP failed for some reason (A_AIDL_BDIS timeout) */ 582 notresponding(isp); 583 584 fallthrough; 585 case OTG_STATE_A_VBUS_ERR: 586 isp->phy.otg->state = OTG_STATE_A_WAIT_VFALL; 587 pr_debug(" --> a_wait_vfall\n"); 588 fallthrough; 589 case OTG_STATE_A_WAIT_VFALL: 590 /* FIXME usbcore thinks port power is still on ... */ 591 clr |= OTG1_VBUS_DRV; 592 break; 593 case OTG_STATE_A_IDLE: 594 if (otg_ctrl & OTG_DRV_VBUS) { 595 isp->phy.otg->state = OTG_STATE_A_WAIT_VRISE; 596 pr_debug(" --> a_wait_vrise\n"); 597 } 598 fallthrough; 599 default: 600 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV); 601 } 602 603 toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG); 604 toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG); 605 606# undef toggle 607 608 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set); 609 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr); 610 611 /* HNP switch to host or peripheral; and SRP */ 612 if (otg_change & OTG_PULLUP) { 613 u32 l; 614 615 switch (isp->phy.otg->state) { 616 case OTG_STATE_B_IDLE: 617 if (clr & OTG1_DP_PULLUP) 618 break; 619 isp->phy.otg->state = OTG_STATE_B_PERIPHERAL; 620 pr_debug(" --> b_peripheral\n"); 621 break; 622 case OTG_STATE_A_SUSPEND: 623 if (clr & OTG1_DP_PULLUP) 624 break; 625 isp->phy.otg->state = OTG_STATE_A_PERIPHERAL; 626 pr_debug(" --> a_peripheral\n"); 627 break; 628 default: 629 break; 630 } 631 l = omap_readl(OTG_CTRL); 632 l |= OTG_PULLUP; 633 omap_writel(l, OTG_CTRL); 634 } 635 636 check_state(isp, __func__); 637 dump_regs(isp, "otg->isp1301"); 638} 639 640static irqreturn_t omap_otg_irq(int irq, void *_isp) 641{ 642 u16 otg_irq = omap_readw(OTG_IRQ_SRC); 643 u32 otg_ctrl; 644 int ret = IRQ_NONE; 645 struct isp1301 *isp = _isp; 646 struct usb_otg *otg = isp->phy.otg; 647 648 /* update ISP1301 transceiver from OTG controller */ 649 if (otg_irq & OPRT_CHG) { 650 omap_writew(OPRT_CHG, OTG_IRQ_SRC); 651 isp1301_defer_work(isp, WORK_UPDATE_ISP); 652 ret = IRQ_HANDLED; 653 654 /* SRP to become b_peripheral failed */ 655 } else if (otg_irq & B_SRP_TMROUT) { 656 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL)); 657 notresponding(isp); 658 659 /* gadget drivers that care should monitor all kinds of 660 * remote wakeup (SRP, normal) using their own timer 661 * to give "check cable and A-device" messages. 662 */ 663 if (isp->phy.otg->state == OTG_STATE_B_SRP_INIT) 664 b_idle(isp, "srp_timeout"); 665 666 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC); 667 ret = IRQ_HANDLED; 668 669 /* HNP to become b_host failed */ 670 } else if (otg_irq & B_HNP_FAIL) { 671 pr_debug("otg: %s B_HNP_FAIL, %06x\n", 672 state_name(isp), omap_readl(OTG_CTRL)); 673 notresponding(isp); 674 675 otg_ctrl = omap_readl(OTG_CTRL); 676 otg_ctrl |= OTG_BUSDROP; 677 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS; 678 omap_writel(otg_ctrl, OTG_CTRL); 679 680 /* subset of b_peripheral()... */ 681 isp->phy.otg->state = OTG_STATE_B_PERIPHERAL; 682 pr_debug(" --> b_peripheral\n"); 683 684 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC); 685 ret = IRQ_HANDLED; 686 687 /* detect SRP from B-device ... */ 688 } else if (otg_irq & A_SRP_DETECT) { 689 pr_debug("otg: %s SRP_DETECT, %06x\n", 690 state_name(isp), omap_readl(OTG_CTRL)); 691 692 isp1301_defer_work(isp, WORK_UPDATE_OTG); 693 switch (isp->phy.otg->state) { 694 case OTG_STATE_A_IDLE: 695 if (!otg->host) 696 break; 697 isp1301_defer_work(isp, WORK_HOST_RESUME); 698 otg_ctrl = omap_readl(OTG_CTRL); 699 otg_ctrl |= OTG_A_BUSREQ; 700 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ) 701 & ~OTG_XCEIV_INPUTS 702 & OTG_CTRL_MASK; 703 omap_writel(otg_ctrl, OTG_CTRL); 704 break; 705 default: 706 break; 707 } 708 709 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC); 710 ret = IRQ_HANDLED; 711 712 /* timer expired: T(a_wait_bcon) and maybe T(a_wait_vrise) 713 * we don't track them separately 714 */ 715 } else if (otg_irq & A_REQ_TMROUT) { 716 otg_ctrl = omap_readl(OTG_CTRL); 717 pr_info("otg: BCON_TMOUT from %s, %06x\n", 718 state_name(isp), otg_ctrl); 719 notresponding(isp); 720 721 otg_ctrl |= OTG_BUSDROP; 722 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS; 723 omap_writel(otg_ctrl, OTG_CTRL); 724 isp->phy.otg->state = OTG_STATE_A_WAIT_VFALL; 725 726 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC); 727 ret = IRQ_HANDLED; 728 729 /* A-supplied voltage fell too low; overcurrent */ 730 } else if (otg_irq & A_VBUS_ERR) { 731 otg_ctrl = omap_readl(OTG_CTRL); 732 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n", 733 state_name(isp), otg_irq, otg_ctrl); 734 735 otg_ctrl |= OTG_BUSDROP; 736 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS; 737 omap_writel(otg_ctrl, OTG_CTRL); 738 isp->phy.otg->state = OTG_STATE_A_VBUS_ERR; 739 740 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC); 741 ret = IRQ_HANDLED; 742 743 /* switch driver; the transceiver code activates it, 744 * ungating the udc clock or resuming OHCI. 745 */ 746 } else if (otg_irq & DRIVER_SWITCH) { 747 int kick = 0; 748 749 otg_ctrl = omap_readl(OTG_CTRL); 750 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n", 751 state_name(isp), 752 (otg_ctrl & OTG_DRIVER_SEL) 753 ? "gadget" : "host", 754 otg_ctrl); 755 isp1301_defer_work(isp, WORK_UPDATE_ISP); 756 757 /* role is peripheral */ 758 if (otg_ctrl & OTG_DRIVER_SEL) { 759 switch (isp->phy.otg->state) { 760 case OTG_STATE_A_IDLE: 761 b_idle(isp, __func__); 762 break; 763 default: 764 break; 765 } 766 isp1301_defer_work(isp, WORK_UPDATE_ISP); 767 768 /* role is host */ 769 } else { 770 if (!(otg_ctrl & OTG_ID)) { 771 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS; 772 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL); 773 } 774 775 if (otg->host) { 776 switch (isp->phy.otg->state) { 777 case OTG_STATE_B_WAIT_ACON: 778 isp->phy.otg->state = OTG_STATE_B_HOST; 779 pr_debug(" --> b_host\n"); 780 kick = 1; 781 break; 782 case OTG_STATE_A_WAIT_BCON: 783 isp->phy.otg->state = OTG_STATE_A_HOST; 784 pr_debug(" --> a_host\n"); 785 break; 786 case OTG_STATE_A_PERIPHERAL: 787 isp->phy.otg->state = OTG_STATE_A_WAIT_BCON; 788 pr_debug(" --> a_wait_bcon\n"); 789 break; 790 default: 791 break; 792 } 793 isp1301_defer_work(isp, WORK_HOST_RESUME); 794 } 795 } 796 797 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC); 798 ret = IRQ_HANDLED; 799 800 if (kick) 801 usb_bus_start_enum(otg->host, otg->host->otg_port); 802 } 803 804 check_state(isp, __func__); 805 return ret; 806} 807 808static struct platform_device *otg_dev; 809 810static int isp1301_otg_init(struct isp1301 *isp) 811{ 812 u32 l; 813 814 if (!otg_dev) 815 return -ENODEV; 816 817 dump_regs(isp, __func__); 818 /* some of these values are board-specific... */ 819 l = omap_readl(OTG_SYSCON_2); 820 l |= OTG_EN 821 /* for B-device: */ 822 | SRP_GPDATA /* 9msec Bdev D+ pulse */ 823 | SRP_GPDVBUS /* discharge after VBUS pulse */ 824 // | (3 << 24) /* 2msec VBUS pulse */ 825 /* for A-device: */ 826 | (0 << 20) /* 200ms nominal A_WAIT_VRISE timer */ 827 | SRP_DPW /* detect 167+ns SRP pulses */ 828 | SRP_DATA | SRP_VBUS /* accept both kinds of SRP pulse */ 829 ; 830 omap_writel(l, OTG_SYSCON_2); 831 832 update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE)); 833 update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS)); 834 835 check_state(isp, __func__); 836 pr_debug("otg: %s, %s %06x\n", 837 state_name(isp), __func__, omap_readl(OTG_CTRL)); 838 839 omap_writew(DRIVER_SWITCH | OPRT_CHG 840 | B_SRP_TMROUT | B_HNP_FAIL 841 | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN); 842 843 l = omap_readl(OTG_SYSCON_2); 844 l |= OTG_EN; 845 omap_writel(l, OTG_SYSCON_2); 846 847 return 0; 848} 849 850static int otg_probe(struct platform_device *dev) 851{ 852 // struct omap_usb_config *config = dev->platform_data; 853 854 otg_dev = dev; 855 return 0; 856} 857 858static int otg_remove(struct platform_device *dev) 859{ 860 otg_dev = NULL; 861 return 0; 862} 863 864static struct platform_driver omap_otg_driver = { 865 .probe = otg_probe, 866 .remove = otg_remove, 867 .driver = { 868 .name = "omap_otg", 869 }, 870}; 871 872static int otg_bind(struct isp1301 *isp) 873{ 874 int status; 875 876 if (otg_dev) 877 return -EBUSY; 878 879 status = platform_driver_register(&omap_otg_driver); 880 if (status < 0) 881 return status; 882 883 if (otg_dev) 884 status = request_irq(otg_dev->resource[1].start, omap_otg_irq, 885 0, DRIVER_NAME, isp); 886 else 887 status = -ENODEV; 888 889 if (status < 0) 890 platform_driver_unregister(&omap_otg_driver); 891 return status; 892} 893 894static void otg_unbind(struct isp1301 *isp) 895{ 896 if (!otg_dev) 897 return; 898 free_irq(otg_dev->resource[1].start, isp); 899} 900 901#else 902 903/* OTG controller isn't clocked */ 904 905#endif /* CONFIG_USB_OTG */ 906 907/*-------------------------------------------------------------------------*/ 908 909static void b_peripheral(struct isp1301 *isp) 910{ 911 u32 l; 912 913 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS; 914 omap_writel(l, OTG_CTRL); 915 916 usb_gadget_vbus_connect(isp->phy.otg->gadget); 917 918#ifdef CONFIG_USB_OTG 919 enable_vbus_draw(isp, 8); 920 otg_update_isp(isp); 921#else 922 enable_vbus_draw(isp, 100); 923 /* UDC driver just set OTG_BSESSVLD */ 924 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP); 925 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN); 926 isp->phy.otg->state = OTG_STATE_B_PERIPHERAL; 927 pr_debug(" --> b_peripheral\n"); 928 dump_regs(isp, "2periph"); 929#endif 930} 931 932static void isp_update_otg(struct isp1301 *isp, u8 stat) 933{ 934 struct usb_otg *otg = isp->phy.otg; 935 u8 isp_stat, isp_bstat; 936 enum usb_otg_state state = isp->phy.otg->state; 937 938 if (stat & INTR_BDIS_ACON) 939 pr_debug("OTG: BDIS_ACON, %s\n", state_name(isp)); 940 941 /* start certain state transitions right away */ 942 isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE); 943 if (isp_stat & INTR_ID_GND) { 944 if (otg->default_a) { 945 switch (state) { 946 case OTG_STATE_B_IDLE: 947 a_idle(isp, "idle"); 948 fallthrough; 949 case OTG_STATE_A_IDLE: 950 enable_vbus_source(isp); 951 fallthrough; 952 case OTG_STATE_A_WAIT_VRISE: 953 /* we skip over OTG_STATE_A_WAIT_BCON, since 954 * the HC will transition to A_HOST (or 955 * A_SUSPEND!) without our noticing except 956 * when HNP is used. 957 */ 958 if (isp_stat & INTR_VBUS_VLD) 959 isp->phy.otg->state = OTG_STATE_A_HOST; 960 break; 961 case OTG_STATE_A_WAIT_VFALL: 962 if (!(isp_stat & INTR_SESS_VLD)) 963 a_idle(isp, "vfell"); 964 break; 965 default: 966 if (!(isp_stat & INTR_VBUS_VLD)) 967 isp->phy.otg->state = OTG_STATE_A_VBUS_ERR; 968 break; 969 } 970 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS); 971 } else { 972 switch (state) { 973 case OTG_STATE_B_PERIPHERAL: 974 case OTG_STATE_B_HOST: 975 case OTG_STATE_B_WAIT_ACON: 976 usb_gadget_vbus_disconnect(otg->gadget); 977 break; 978 default: 979 break; 980 } 981 if (state != OTG_STATE_A_IDLE) 982 a_idle(isp, "id"); 983 if (otg->host && state == OTG_STATE_A_IDLE) 984 isp1301_defer_work(isp, WORK_HOST_RESUME); 985 isp_bstat = 0; 986 } 987 } else { 988 u32 l; 989 990 /* if user unplugged mini-A end of cable, 991 * don't bypass A_WAIT_VFALL. 992 */ 993 if (otg->default_a) { 994 switch (state) { 995 default: 996 isp->phy.otg->state = OTG_STATE_A_WAIT_VFALL; 997 break; 998 case OTG_STATE_A_WAIT_VFALL: 999 state = OTG_STATE_A_IDLE; 1000 /* hub_wq may take a while to notice and 1001 * handle this disconnect, so don't go 1002 * to B_IDLE quite yet. 1003 */ 1004 break; 1005 case OTG_STATE_A_IDLE: 1006 host_suspend(isp); 1007 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, 1008 MC1_BDIS_ACON_EN); 1009 isp->phy.otg->state = OTG_STATE_B_IDLE; 1010 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK; 1011 l &= ~OTG_CTRL_BITS; 1012 omap_writel(l, OTG_CTRL); 1013 break; 1014 case OTG_STATE_B_IDLE: 1015 break; 1016 } 1017 } 1018 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS); 1019 1020 switch (isp->phy.otg->state) { 1021 case OTG_STATE_B_PERIPHERAL: 1022 case OTG_STATE_B_WAIT_ACON: 1023 case OTG_STATE_B_HOST: 1024 if (likely(isp_bstat & OTG_B_SESS_VLD)) 1025 break; 1026 enable_vbus_draw(isp, 0); 1027#ifndef CONFIG_USB_OTG 1028 /* UDC driver will clear OTG_BSESSVLD */ 1029 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, 1030 OTG1_DP_PULLDOWN); 1031 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, 1032 OTG1_DP_PULLUP); 1033 dump_regs(isp, __func__); 1034#endif 1035 fallthrough; 1036 case OTG_STATE_B_SRP_INIT: 1037 b_idle(isp, __func__); 1038 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS; 1039 omap_writel(l, OTG_CTRL); 1040 fallthrough; 1041 case OTG_STATE_B_IDLE: 1042 if (otg->gadget && (isp_bstat & OTG_B_SESS_VLD)) { 1043#ifdef CONFIG_USB_OTG 1044 update_otg1(isp, isp_stat); 1045 update_otg2(isp, isp_bstat); 1046#endif 1047 b_peripheral(isp); 1048 } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD))) 1049 isp_bstat |= OTG_B_SESS_END; 1050 break; 1051 case OTG_STATE_A_WAIT_VFALL: 1052 break; 1053 default: 1054 pr_debug("otg: unsupported b-device %s\n", 1055 state_name(isp)); 1056 break; 1057 } 1058 } 1059 1060 if (state != isp->phy.otg->state) 1061 pr_debug(" isp, %s -> %s\n", 1062 usb_otg_state_string(state), state_name(isp)); 1063 1064#ifdef CONFIG_USB_OTG 1065 /* update the OTG controller state to match the isp1301; may 1066 * trigger OPRT_CHG irqs for changes going to the isp1301. 1067 */ 1068 update_otg1(isp, isp_stat); 1069 update_otg2(isp, isp_bstat); 1070 check_state(isp, __func__); 1071#endif 1072 1073 dump_regs(isp, "isp1301->otg"); 1074} 1075 1076/*-------------------------------------------------------------------------*/ 1077 1078static u8 isp1301_clear_latch(struct isp1301 *isp) 1079{ 1080 u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH); 1081 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch); 1082 return latch; 1083} 1084 1085static void 1086isp1301_work(struct work_struct *work) 1087{ 1088 struct isp1301 *isp = container_of(work, struct isp1301, work); 1089 int stop; 1090 1091 /* implicit lock: we're the only task using this device */ 1092 isp->working = 1; 1093 do { 1094 stop = test_bit(WORK_STOP, &isp->todo); 1095 1096#ifdef CONFIG_USB_OTG 1097 /* transfer state from otg engine to isp1301 */ 1098 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) { 1099 otg_update_isp(isp); 1100 put_device(&isp->client->dev); 1101 } 1102#endif 1103 /* transfer state from isp1301 to otg engine */ 1104 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) { 1105 u8 stat = isp1301_clear_latch(isp); 1106 1107 isp_update_otg(isp, stat); 1108 put_device(&isp->client->dev); 1109 } 1110 1111 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) { 1112 u32 otg_ctrl; 1113 1114 /* 1115 * skip A_WAIT_VRISE; hc transitions invisibly 1116 * skip A_WAIT_BCON; same. 1117 */ 1118 switch (isp->phy.otg->state) { 1119 case OTG_STATE_A_WAIT_BCON: 1120 case OTG_STATE_A_WAIT_VRISE: 1121 isp->phy.otg->state = OTG_STATE_A_HOST; 1122 pr_debug(" --> a_host\n"); 1123 otg_ctrl = omap_readl(OTG_CTRL); 1124 otg_ctrl |= OTG_A_BUSREQ; 1125 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ) 1126 & OTG_CTRL_MASK; 1127 omap_writel(otg_ctrl, OTG_CTRL); 1128 break; 1129 case OTG_STATE_B_WAIT_ACON: 1130 isp->phy.otg->state = OTG_STATE_B_HOST; 1131 pr_debug(" --> b_host (acon)\n"); 1132 break; 1133 case OTG_STATE_B_HOST: 1134 case OTG_STATE_B_IDLE: 1135 case OTG_STATE_A_IDLE: 1136 break; 1137 default: 1138 pr_debug(" host resume in %s\n", 1139 state_name(isp)); 1140 } 1141 host_resume(isp); 1142 // mdelay(10); 1143 put_device(&isp->client->dev); 1144 } 1145 1146 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) { 1147#ifdef VERBOSE 1148 dump_regs(isp, "timer"); 1149 if (!stop) 1150 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES); 1151#endif 1152 put_device(&isp->client->dev); 1153 } 1154 1155 if (isp->todo) 1156 dev_vdbg(&isp->client->dev, 1157 "work done, todo = 0x%lx\n", 1158 isp->todo); 1159 if (stop) { 1160 dev_dbg(&isp->client->dev, "stop\n"); 1161 break; 1162 } 1163 } while (isp->todo); 1164 isp->working = 0; 1165} 1166 1167static irqreturn_t isp1301_irq(int irq, void *isp) 1168{ 1169 isp1301_defer_work(isp, WORK_UPDATE_OTG); 1170 return IRQ_HANDLED; 1171} 1172 1173static void isp1301_timer(struct timer_list *t) 1174{ 1175 struct isp1301 *isp = from_timer(isp, t, timer); 1176 1177 isp1301_defer_work(isp, WORK_TIMER); 1178} 1179 1180/*-------------------------------------------------------------------------*/ 1181 1182static void isp1301_release(struct device *dev) 1183{ 1184 struct isp1301 *isp; 1185 1186 isp = dev_get_drvdata(dev); 1187 1188 /* FIXME -- not with a "new style" driver, it doesn't!! */ 1189 1190 /* ugly -- i2c hijacks our memory hook to wait_for_completion() */ 1191 if (isp->i2c_release) 1192 isp->i2c_release(dev); 1193 kfree(isp->phy.otg); 1194 kfree (isp); 1195} 1196 1197static struct isp1301 *the_transceiver; 1198 1199static int isp1301_remove(struct i2c_client *i2c) 1200{ 1201 struct isp1301 *isp; 1202 1203 isp = i2c_get_clientdata(i2c); 1204 1205 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0); 1206 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0); 1207 free_irq(i2c->irq, isp); 1208#ifdef CONFIG_USB_OTG 1209 otg_unbind(isp); 1210#endif 1211 if (machine_is_omap_h2()) 1212 gpio_free(2); 1213 1214 set_bit(WORK_STOP, &isp->todo); 1215 del_timer_sync(&isp->timer); 1216 flush_work(&isp->work); 1217 1218 put_device(&i2c->dev); 1219 the_transceiver = NULL; 1220 1221 return 0; 1222} 1223 1224/*-------------------------------------------------------------------------*/ 1225 1226/* NOTE: three modes are possible here, only one of which 1227 * will be standards-conformant on any given system: 1228 * 1229 * - OTG mode (dual-role), required if there's a Mini-AB connector 1230 * - HOST mode, for when there's one or more A (host) connectors 1231 * - DEVICE mode, for when there's a B/Mini-B (device) connector 1232 * 1233 * As a rule, you won't have an isp1301 chip unless it's there to 1234 * support the OTG mode. Other modes help testing USB controllers 1235 * in isolation from (full) OTG support, or maybe so later board 1236 * revisions can help to support those feature. 1237 */ 1238 1239#ifdef CONFIG_USB_OTG 1240 1241static int isp1301_otg_enable(struct isp1301 *isp) 1242{ 1243 power_up(isp); 1244 isp1301_otg_init(isp); 1245 1246 /* NOTE: since we don't change this, this provides 1247 * a few more interrupts than are strictly needed. 1248 */ 1249 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING, 1250 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND); 1251 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING, 1252 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND); 1253 1254 dev_info(&isp->client->dev, "ready for dual-role USB ...\n"); 1255 1256 return 0; 1257} 1258 1259#endif 1260 1261/* add or disable the host device+driver */ 1262static int 1263isp1301_set_host(struct usb_otg *otg, struct usb_bus *host) 1264{ 1265 struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy); 1266 1267 if (isp != the_transceiver) 1268 return -ENODEV; 1269 1270 if (!host) { 1271 omap_writew(0, OTG_IRQ_EN); 1272 power_down(isp); 1273 otg->host = NULL; 1274 return 0; 1275 } 1276 1277#ifdef CONFIG_USB_OTG 1278 otg->host = host; 1279 dev_dbg(&isp->client->dev, "registered host\n"); 1280 host_suspend(isp); 1281 if (otg->gadget) 1282 return isp1301_otg_enable(isp); 1283 return 0; 1284 1285#elif !IS_ENABLED(CONFIG_USB_OMAP) 1286 // FIXME update its refcount 1287 otg->host = host; 1288 1289 power_up(isp); 1290 1291 if (machine_is_omap_h2()) 1292 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0); 1293 1294 dev_info(&isp->client->dev, "A-Host sessions ok\n"); 1295 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING, 1296 INTR_ID_GND); 1297 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING, 1298 INTR_ID_GND); 1299 1300 /* If this has a Mini-AB connector, this mode is highly 1301 * nonstandard ... but can be handy for testing, especially with 1302 * the Mini-A end of an OTG cable. (Or something nonstandard 1303 * like MiniB-to-StandardB, maybe built with a gender mender.) 1304 */ 1305 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV); 1306 1307 dump_regs(isp, __func__); 1308 1309 return 0; 1310 1311#else 1312 dev_dbg(&isp->client->dev, "host sessions not allowed\n"); 1313 return -EINVAL; 1314#endif 1315 1316} 1317 1318static int 1319isp1301_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget) 1320{ 1321 struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy); 1322 1323 if (isp != the_transceiver) 1324 return -ENODEV; 1325 1326 if (!gadget) { 1327 omap_writew(0, OTG_IRQ_EN); 1328 if (!otg->default_a) 1329 enable_vbus_draw(isp, 0); 1330 usb_gadget_vbus_disconnect(otg->gadget); 1331 otg->gadget = NULL; 1332 power_down(isp); 1333 return 0; 1334 } 1335 1336#ifdef CONFIG_USB_OTG 1337 otg->gadget = gadget; 1338 dev_dbg(&isp->client->dev, "registered gadget\n"); 1339 /* gadget driver may be suspended until vbus_connect () */ 1340 if (otg->host) 1341 return isp1301_otg_enable(isp); 1342 return 0; 1343 1344#elif !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE) 1345 otg->gadget = gadget; 1346 // FIXME update its refcount 1347 1348 { 1349 u32 l; 1350 1351 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK; 1352 l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS); 1353 l |= OTG_ID; 1354 omap_writel(l, OTG_CTRL); 1355 } 1356 1357 power_up(isp); 1358 isp->phy.otg->state = OTG_STATE_B_IDLE; 1359 1360 if (machine_is_omap_h2() || machine_is_omap_h3()) 1361 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0); 1362 1363 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING, 1364 INTR_SESS_VLD); 1365 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING, 1366 INTR_VBUS_VLD); 1367 dev_info(&isp->client->dev, "B-Peripheral sessions ok\n"); 1368 dump_regs(isp, __func__); 1369 1370 /* If this has a Mini-AB connector, this mode is highly 1371 * nonstandard ... but can be handy for testing, so long 1372 * as you don't plug a Mini-A cable into the jack. 1373 */ 1374 if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD) 1375 b_peripheral(isp); 1376 1377 return 0; 1378 1379#else 1380 dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n"); 1381 return -EINVAL; 1382#endif 1383} 1384 1385 1386/*-------------------------------------------------------------------------*/ 1387 1388static int 1389isp1301_set_power(struct usb_phy *dev, unsigned mA) 1390{ 1391 if (!the_transceiver) 1392 return -ENODEV; 1393 if (dev->otg->state == OTG_STATE_B_PERIPHERAL) 1394 enable_vbus_draw(the_transceiver, mA); 1395 return 0; 1396} 1397 1398static int 1399isp1301_start_srp(struct usb_otg *otg) 1400{ 1401 struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy); 1402 u32 otg_ctrl; 1403 1404 if (isp != the_transceiver || isp->phy.otg->state != OTG_STATE_B_IDLE) 1405 return -ENODEV; 1406 1407 otg_ctrl = omap_readl(OTG_CTRL); 1408 if (!(otg_ctrl & OTG_BSESSEND)) 1409 return -EINVAL; 1410 1411 otg_ctrl |= OTG_B_BUSREQ; 1412 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK; 1413 omap_writel(otg_ctrl, OTG_CTRL); 1414 isp->phy.otg->state = OTG_STATE_B_SRP_INIT; 1415 1416 pr_debug("otg: SRP, %s ... %06x\n", state_name(isp), 1417 omap_readl(OTG_CTRL)); 1418#ifdef CONFIG_USB_OTG 1419 check_state(isp, __func__); 1420#endif 1421 return 0; 1422} 1423 1424static int 1425isp1301_start_hnp(struct usb_otg *otg) 1426{ 1427#ifdef CONFIG_USB_OTG 1428 struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy); 1429 u32 l; 1430 1431 if (isp != the_transceiver) 1432 return -ENODEV; 1433 if (otg->default_a && (otg->host == NULL || !otg->host->b_hnp_enable)) 1434 return -ENOTCONN; 1435 if (!otg->default_a && (otg->gadget == NULL 1436 || !otg->gadget->b_hnp_enable)) 1437 return -ENOTCONN; 1438 1439 /* We want hardware to manage most HNP protocol timings. 1440 * So do this part as early as possible... 1441 */ 1442 switch (isp->phy.otg->state) { 1443 case OTG_STATE_B_HOST: 1444 isp->phy.otg->state = OTG_STATE_B_PERIPHERAL; 1445 /* caller will suspend next */ 1446 break; 1447 case OTG_STATE_A_HOST: 1448#if 0 1449 /* autoconnect mode avoids irq latency bugs */ 1450 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, 1451 MC1_BDIS_ACON_EN); 1452#endif 1453 /* caller must suspend then clear A_BUSREQ */ 1454 usb_gadget_vbus_connect(otg->gadget); 1455 l = omap_readl(OTG_CTRL); 1456 l |= OTG_A_SETB_HNPEN; 1457 omap_writel(l, OTG_CTRL); 1458 1459 break; 1460 case OTG_STATE_A_PERIPHERAL: 1461 /* initiated by B-Host suspend */ 1462 break; 1463 default: 1464 return -EILSEQ; 1465 } 1466 pr_debug("otg: HNP %s, %06x ...\n", 1467 state_name(isp), omap_readl(OTG_CTRL)); 1468 check_state(isp, __func__); 1469 return 0; 1470#else 1471 /* srp-only */ 1472 return -EINVAL; 1473#endif 1474} 1475 1476/*-------------------------------------------------------------------------*/ 1477 1478static int 1479isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id) 1480{ 1481 int status; 1482 struct isp1301 *isp; 1483 1484 if (the_transceiver) 1485 return 0; 1486 1487 isp = kzalloc(sizeof *isp, GFP_KERNEL); 1488 if (!isp) 1489 return 0; 1490 1491 isp->phy.otg = kzalloc(sizeof *isp->phy.otg, GFP_KERNEL); 1492 if (!isp->phy.otg) { 1493 kfree(isp); 1494 return 0; 1495 } 1496 1497 INIT_WORK(&isp->work, isp1301_work); 1498 timer_setup(&isp->timer, isp1301_timer, 0); 1499 1500 i2c_set_clientdata(i2c, isp); 1501 isp->client = i2c; 1502 1503 /* verify the chip (shouldn't be necessary) */ 1504 status = isp1301_get_u16(isp, ISP1301_VENDOR_ID); 1505 if (status != I2C_VENDOR_ID_PHILIPS) { 1506 dev_dbg(&i2c->dev, "not philips id: %d\n", status); 1507 goto fail; 1508 } 1509 status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID); 1510 if (status != I2C_PRODUCT_ID_PHILIPS_1301) { 1511 dev_dbg(&i2c->dev, "not isp1301, %d\n", status); 1512 goto fail; 1513 } 1514 isp->i2c_release = i2c->dev.release; 1515 i2c->dev.release = isp1301_release; 1516 1517 /* initial development used chiprev 2.00 */ 1518 status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE); 1519 dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n", 1520 status >> 8, status & 0xff); 1521 1522 /* make like power-on reset */ 1523 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK); 1524 1525 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI); 1526 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI); 1527 1528 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, 1529 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN); 1530 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, 1531 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN)); 1532 1533 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0); 1534 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0); 1535 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0); 1536 1537#ifdef CONFIG_USB_OTG 1538 status = otg_bind(isp); 1539 if (status < 0) { 1540 dev_dbg(&i2c->dev, "can't bind OTG\n"); 1541 goto fail; 1542 } 1543#endif 1544 1545 if (machine_is_omap_h2()) { 1546 /* full speed signaling by default */ 1547 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, 1548 MC1_SPEED); 1549 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, 1550 MC2_SPD_SUSP_CTRL); 1551 1552 /* IRQ wired at M14 */ 1553 omap_cfg_reg(M14_1510_GPIO2); 1554 if (gpio_request(2, "isp1301") == 0) 1555 gpio_direction_input(2); 1556 isp->irq_type = IRQF_TRIGGER_FALLING; 1557 } 1558 1559 status = request_irq(i2c->irq, isp1301_irq, 1560 isp->irq_type, DRIVER_NAME, isp); 1561 if (status < 0) { 1562 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n", 1563 i2c->irq, status); 1564 goto fail; 1565 } 1566 1567 isp->phy.dev = &i2c->dev; 1568 isp->phy.label = DRIVER_NAME; 1569 isp->phy.set_power = isp1301_set_power, 1570 1571 isp->phy.otg->usb_phy = &isp->phy; 1572 isp->phy.otg->set_host = isp1301_set_host, 1573 isp->phy.otg->set_peripheral = isp1301_set_peripheral, 1574 isp->phy.otg->start_srp = isp1301_start_srp, 1575 isp->phy.otg->start_hnp = isp1301_start_hnp, 1576 1577 enable_vbus_draw(isp, 0); 1578 power_down(isp); 1579 the_transceiver = isp; 1580 1581#ifdef CONFIG_USB_OTG 1582 update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE)); 1583 update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS)); 1584#endif 1585 1586 dump_regs(isp, __func__); 1587 1588#ifdef VERBOSE 1589 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES); 1590 dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES); 1591#endif 1592 1593 status = usb_add_phy(&isp->phy, USB_PHY_TYPE_USB2); 1594 if (status < 0) 1595 dev_err(&i2c->dev, "can't register transceiver, %d\n", 1596 status); 1597 1598 return 0; 1599 1600fail: 1601 kfree(isp->phy.otg); 1602 kfree(isp); 1603 return -ENODEV; 1604} 1605 1606static const struct i2c_device_id isp1301_id[] = { 1607 { "isp1301_omap", 0 }, 1608 { } 1609}; 1610MODULE_DEVICE_TABLE(i2c, isp1301_id); 1611 1612static struct i2c_driver isp1301_driver = { 1613 .driver = { 1614 .name = "isp1301_omap", 1615 }, 1616 .probe = isp1301_probe, 1617 .remove = isp1301_remove, 1618 .id_table = isp1301_id, 1619}; 1620 1621/*-------------------------------------------------------------------------*/ 1622 1623static int __init isp_init(void) 1624{ 1625 return i2c_add_driver(&isp1301_driver); 1626} 1627subsys_initcall(isp_init); 1628 1629static void __exit isp_exit(void) 1630{ 1631 if (the_transceiver) 1632 usb_remove_phy(&the_transceiver->phy); 1633 i2c_del_driver(&isp1301_driver); 1634} 1635module_exit(isp_exit); 1636 1637