1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * MUSB OTG driver core code 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 /* 11 * Inventra (Multipoint) Dual-Role Controller Driver for Linux. 12 * 13 * This consists of a Host Controller Driver (HCD) and a peripheral 14 * controller driver implementing the "Gadget" API; OTG support is 15 * in the works. These are normal Linux-USB controller drivers which 16 * use IRQs and have no dedicated thread. 17 * 18 * This version of the driver has only been used with products from 19 * Texas Instruments. Those products integrate the Inventra logic 20 * with other DMA, IRQ, and bus modules, as well as other logic that 21 * needs to be reflected in this driver. 22 * 23 * 24 * NOTE: the original Mentor code here was pretty much a collection 25 * of mechanisms that don't seem to have been fully integrated/working 26 * for *any* Linux kernel version. This version aims at Linux 2.6.now, 27 * Key open issues include: 28 * 29 * - Lack of host-side transaction scheduling, for all transfer types. 30 * The hardware doesn't do it; instead, software must. 31 * 32 * This is not an issue for OTG devices that don't support external 33 * hubs, but for more "normal" USB hosts it's a user issue that the 34 * "multipoint" support doesn't scale in the expected ways. That 35 * includes DaVinci EVM in a common non-OTG mode. 36 * 37 * * Control and bulk use dedicated endpoints, and there's as 38 * yet no mechanism to either (a) reclaim the hardware when 39 * peripherals are NAKing, which gets complicated with bulk 40 * endpoints, or (b) use more than a single bulk endpoint in 41 * each direction. 42 * 43 * RESULT: one device may be perceived as blocking another one. 44 * 45 * * Interrupt and isochronous will dynamically allocate endpoint 46 * hardware, but (a) there's no record keeping for bandwidth; 47 * (b) in the common case that few endpoints are available, there 48 * is no mechanism to reuse endpoints to talk to multiple devices. 49 * 50 * RESULT: At one extreme, bandwidth can be overcommitted in 51 * some hardware configurations, no faults will be reported. 52 * At the other extreme, the bandwidth capabilities which do 53 * exist tend to be severely undercommitted. You can't yet hook 54 * up both a keyboard and a mouse to an external USB hub. 55 */ 56 57 /* 58 * This gets many kinds of configuration information: 59 * - Kconfig for everything user-configurable 60 * - platform_device for addressing, irq, and platform_data 61 * - platform_data is mostly for board-specific information 62 * (plus recentrly, SOC or family details) 63 * 64 * Most of the conditional compilation will (someday) vanish. 65 */ 66 67 #include <linux/module.h> 68 #include <linux/kernel.h> 69 #include <linux/sched.h> 70 #include <linux/slab.h> 71 #include <linux/list.h> 72 #include <linux/kobject.h> 73 #include <linux/prefetch.h> 74 #include <linux/platform_device.h> 75 #include <linux/io.h> 76 #include <linux/iopoll.h> 77 #include <linux/dma-mapping.h> 78 #include <linux/usb.h> 79 #include <linux/usb/of.h> 80 81 #include "musb_core.h" 82 #include "musb_trace.h" 83 84 #define TA_WAIT_BCON(m) max_t(int, (m)->a_wait_bcon, OTG_TIME_A_WAIT_BCON) 85 86 87 #define DRIVER_AUTHOR "Mentor Graphics, Texas Instruments, Nokia" 88 #define DRIVER_DESC "Inventra Dual-Role USB Controller Driver" 89 90 #define MUSB_VERSION "6.0" 91 92 #define DRIVER_INFO DRIVER_DESC ", v" MUSB_VERSION 93 94 #define MUSB_DRIVER_NAME "musb-hdrc" 95 const char musb_driver_name[] = MUSB_DRIVER_NAME; 96 97 MODULE_DESCRIPTION(DRIVER_INFO); 98 MODULE_AUTHOR(DRIVER_AUTHOR); 99 MODULE_LICENSE("GPL"); 100 MODULE_ALIAS("platform:" MUSB_DRIVER_NAME); 101 102 103 /*-------------------------------------------------------------------------*/ 104 105 static inline struct musb *dev_to_musb(struct device *dev) 106 { 107 return dev_get_drvdata(dev); 108 } 109 110 enum musb_mode musb_get_mode(struct device *dev) 111 { 112 enum usb_dr_mode mode; 113 114 mode = usb_get_dr_mode(dev); 115 switch (mode) { 116 case USB_DR_MODE_HOST: 117 return MUSB_HOST; 118 case USB_DR_MODE_PERIPHERAL: 119 return MUSB_PERIPHERAL; 120 case USB_DR_MODE_OTG: 121 case USB_DR_MODE_UNKNOWN: 122 default: 123 return MUSB_OTG; 124 } 125 } 126 EXPORT_SYMBOL_GPL(musb_get_mode); 127 128 /*-------------------------------------------------------------------------*/ 129 130 static int musb_ulpi_read(struct usb_phy *phy, u32 reg) 131 { 132 void __iomem *addr = phy->io_priv; 133 int i = 0; 134 u8 r; 135 u8 power; 136 int ret; 137 138 pm_runtime_get_sync(phy->io_dev); 139 140 /* Make sure the transceiver is not in low power mode */ 141 power = musb_readb(addr, MUSB_POWER); 142 power &= ~MUSB_POWER_SUSPENDM; 143 musb_writeb(addr, MUSB_POWER, power); 144 145 /* REVISIT: musbhdrc_ulpi_an.pdf recommends setting the 146 * ULPICarKitControlDisableUTMI after clearing POWER_SUSPENDM. 147 */ 148 149 musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg); 150 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, 151 MUSB_ULPI_REG_REQ | MUSB_ULPI_RDN_WR); 152 153 while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL) 154 & MUSB_ULPI_REG_CMPLT)) { 155 i++; 156 if (i == 10000) { 157 ret = -ETIMEDOUT; 158 goto out; 159 } 160 161 } 162 r = musb_readb(addr, MUSB_ULPI_REG_CONTROL); 163 r &= ~MUSB_ULPI_REG_CMPLT; 164 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r); 165 166 ret = musb_readb(addr, MUSB_ULPI_REG_DATA); 167 168 out: 169 pm_runtime_put(phy->io_dev); 170 171 return ret; 172 } 173 174 static int musb_ulpi_write(struct usb_phy *phy, u32 val, u32 reg) 175 { 176 void __iomem *addr = phy->io_priv; 177 int i = 0; 178 u8 r = 0; 179 u8 power; 180 int ret = 0; 181 182 pm_runtime_get_sync(phy->io_dev); 183 184 /* Make sure the transceiver is not in low power mode */ 185 power = musb_readb(addr, MUSB_POWER); 186 power &= ~MUSB_POWER_SUSPENDM; 187 musb_writeb(addr, MUSB_POWER, power); 188 189 musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg); 190 musb_writeb(addr, MUSB_ULPI_REG_DATA, (u8)val); 191 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, MUSB_ULPI_REG_REQ); 192 193 while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL) 194 & MUSB_ULPI_REG_CMPLT)) { 195 i++; 196 if (i == 10000) { 197 ret = -ETIMEDOUT; 198 goto out; 199 } 200 } 201 202 r = musb_readb(addr, MUSB_ULPI_REG_CONTROL); 203 r &= ~MUSB_ULPI_REG_CMPLT; 204 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r); 205 206 out: 207 pm_runtime_put(phy->io_dev); 208 209 return ret; 210 } 211 212 static struct usb_phy_io_ops musb_ulpi_access = { 213 .read = musb_ulpi_read, 214 .write = musb_ulpi_write, 215 }; 216 217 /*-------------------------------------------------------------------------*/ 218 219 static u32 musb_default_fifo_offset(u8 epnum) 220 { 221 return 0x20 + (epnum * 4); 222 } 223 224 /* "flat" mapping: each endpoint has its own i/o address */ 225 static void musb_flat_ep_select(void __iomem *mbase, u8 epnum) 226 { 227 } 228 229 static u32 musb_flat_ep_offset(u8 epnum, u16 offset) 230 { 231 return 0x100 + (0x10 * epnum) + offset; 232 } 233 234 /* "indexed" mapping: INDEX register controls register bank select */ 235 static void musb_indexed_ep_select(void __iomem *mbase, u8 epnum) 236 { 237 musb_writeb(mbase, MUSB_INDEX, epnum); 238 } 239 240 static u32 musb_indexed_ep_offset(u8 epnum, u16 offset) 241 { 242 return 0x10 + offset; 243 } 244 245 static u32 musb_default_busctl_offset(u8 epnum, u16 offset) 246 { 247 return 0x80 + (0x08 * epnum) + offset; 248 } 249 250 static u8 musb_default_readb(void __iomem *addr, u32 offset) 251 { 252 u8 data = __raw_readb(addr + offset); 253 254 trace_musb_readb(__builtin_return_address(0), addr, offset, data); 255 return data; 256 } 257 258 static void musb_default_writeb(void __iomem *addr, u32 offset, u8 data) 259 { 260 trace_musb_writeb(__builtin_return_address(0), addr, offset, data); 261 __raw_writeb(data, addr + offset); 262 } 263 264 static u16 musb_default_readw(void __iomem *addr, u32 offset) 265 { 266 u16 data = __raw_readw(addr + offset); 267 268 trace_musb_readw(__builtin_return_address(0), addr, offset, data); 269 return data; 270 } 271 272 static void musb_default_writew(void __iomem *addr, u32 offset, u16 data) 273 { 274 trace_musb_writew(__builtin_return_address(0), addr, offset, data); 275 __raw_writew(data, addr + offset); 276 } 277 278 static u16 musb_default_get_toggle(struct musb_qh *qh, int is_out) 279 { 280 void __iomem *epio = qh->hw_ep->regs; 281 u16 csr; 282 283 if (is_out) 284 csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE; 285 else 286 csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE; 287 288 return csr; 289 } 290 291 static u16 musb_default_set_toggle(struct musb_qh *qh, int is_out, 292 struct urb *urb) 293 { 294 u16 csr; 295 u16 toggle; 296 297 toggle = usb_gettoggle(urb->dev, qh->epnum, is_out); 298 299 if (is_out) 300 csr = toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE 301 | MUSB_TXCSR_H_DATATOGGLE) 302 : MUSB_TXCSR_CLRDATATOG; 303 else 304 csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE 305 | MUSB_RXCSR_H_DATATOGGLE) : 0; 306 307 return csr; 308 } 309 310 /* 311 * Load an endpoint's FIFO 312 */ 313 static void musb_default_write_fifo(struct musb_hw_ep *hw_ep, u16 len, 314 const u8 *src) 315 { 316 struct musb *musb = hw_ep->musb; 317 void __iomem *fifo = hw_ep->fifo; 318 319 if (unlikely(len == 0)) 320 return; 321 322 prefetch((u8 *)src); 323 324 dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n", 325 'T', hw_ep->epnum, fifo, len, src); 326 327 /* we can't assume unaligned reads work */ 328 if (likely((0x01 & (unsigned long) src) == 0)) { 329 u16 index = 0; 330 331 /* best case is 32bit-aligned source address */ 332 if ((0x02 & (unsigned long) src) == 0) { 333 if (len >= 4) { 334 iowrite32_rep(fifo, src + index, len >> 2); 335 index += len & ~0x03; 336 } 337 if (len & 0x02) { 338 __raw_writew(*(u16 *)&src[index], fifo); 339 index += 2; 340 } 341 } else { 342 if (len >= 2) { 343 iowrite16_rep(fifo, src + index, len >> 1); 344 index += len & ~0x01; 345 } 346 } 347 if (len & 0x01) 348 __raw_writeb(src[index], fifo); 349 } else { 350 /* byte aligned */ 351 iowrite8_rep(fifo, src, len); 352 } 353 } 354 355 /* 356 * Unload an endpoint's FIFO 357 */ 358 static void musb_default_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst) 359 { 360 struct musb *musb = hw_ep->musb; 361 void __iomem *fifo = hw_ep->fifo; 362 363 if (unlikely(len == 0)) 364 return; 365 366 dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n", 367 'R', hw_ep->epnum, fifo, len, dst); 368 369 /* we can't assume unaligned writes work */ 370 if (likely((0x01 & (unsigned long) dst) == 0)) { 371 u16 index = 0; 372 373 /* best case is 32bit-aligned destination address */ 374 if ((0x02 & (unsigned long) dst) == 0) { 375 if (len >= 4) { 376 ioread32_rep(fifo, dst, len >> 2); 377 index = len & ~0x03; 378 } 379 if (len & 0x02) { 380 *(u16 *)&dst[index] = __raw_readw(fifo); 381 index += 2; 382 } 383 } else { 384 if (len >= 2) { 385 ioread16_rep(fifo, dst, len >> 1); 386 index = len & ~0x01; 387 } 388 } 389 if (len & 0x01) 390 dst[index] = __raw_readb(fifo); 391 } else { 392 /* byte aligned */ 393 ioread8_rep(fifo, dst, len); 394 } 395 } 396 397 /* 398 * Old style IO functions 399 */ 400 u8 (*musb_readb)(void __iomem *addr, u32 offset); 401 EXPORT_SYMBOL_GPL(musb_readb); 402 403 void (*musb_writeb)(void __iomem *addr, u32 offset, u8 data); 404 EXPORT_SYMBOL_GPL(musb_writeb); 405 406 u8 (*musb_clearb)(void __iomem *addr, u32 offset); 407 EXPORT_SYMBOL_GPL(musb_clearb); 408 409 u16 (*musb_readw)(void __iomem *addr, u32 offset); 410 EXPORT_SYMBOL_GPL(musb_readw); 411 412 void (*musb_writew)(void __iomem *addr, u32 offset, u16 data); 413 EXPORT_SYMBOL_GPL(musb_writew); 414 415 u16 (*musb_clearw)(void __iomem *addr, u32 offset); 416 EXPORT_SYMBOL_GPL(musb_clearw); 417 418 u32 musb_readl(void __iomem *addr, u32 offset) 419 { 420 u32 data = __raw_readl(addr + offset); 421 422 trace_musb_readl(__builtin_return_address(0), addr, offset, data); 423 return data; 424 } 425 EXPORT_SYMBOL_GPL(musb_readl); 426 427 void musb_writel(void __iomem *addr, u32 offset, u32 data) 428 { 429 trace_musb_writel(__builtin_return_address(0), addr, offset, data); 430 __raw_writel(data, addr + offset); 431 } 432 EXPORT_SYMBOL_GPL(musb_writel); 433 434 #ifndef CONFIG_MUSB_PIO_ONLY 435 struct dma_controller * 436 (*musb_dma_controller_create)(struct musb *musb, void __iomem *base); 437 EXPORT_SYMBOL(musb_dma_controller_create); 438 439 void (*musb_dma_controller_destroy)(struct dma_controller *c); 440 EXPORT_SYMBOL(musb_dma_controller_destroy); 441 #endif 442 443 /* 444 * New style IO functions 445 */ 446 void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst) 447 { 448 return hw_ep->musb->io.read_fifo(hw_ep, len, dst); 449 } 450 451 void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src) 452 { 453 return hw_ep->musb->io.write_fifo(hw_ep, len, src); 454 } 455 456 static u8 musb_read_devctl(struct musb *musb) 457 { 458 return musb_readb(musb->mregs, MUSB_DEVCTL); 459 } 460 461 /** 462 * musb_set_host - set and initialize host mode 463 * @musb: musb controller driver data 464 * 465 * At least some musb revisions need to enable devctl session bit in 466 * peripheral mode to switch to host mode. Initializes things to host 467 * mode and sets A_IDLE. SoC glue needs to advance state further 468 * based on phy provided VBUS state. 469 * 470 * Note that the SoC glue code may need to wait for musb to settle 471 * on enable before calling this to avoid babble. 472 */ 473 int musb_set_host(struct musb *musb) 474 { 475 int error = 0; 476 u8 devctl; 477 478 if (!musb) 479 return -EINVAL; 480 481 devctl = musb_read_devctl(musb); 482 if (!(devctl & MUSB_DEVCTL_BDEVICE)) { 483 trace_musb_state(musb, devctl, "Already in host mode"); 484 goto init_data; 485 } 486 487 devctl |= MUSB_DEVCTL_SESSION; 488 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 489 490 error = readx_poll_timeout(musb_read_devctl, musb, devctl, 491 !(devctl & MUSB_DEVCTL_BDEVICE), 5000, 492 1000000); 493 if (error) { 494 dev_err(musb->controller, "%s: could not set host: %02x\n", 495 __func__, devctl); 496 497 return error; 498 } 499 500 devctl = musb_read_devctl(musb); 501 trace_musb_state(musb, devctl, "Host mode set"); 502 503 init_data: 504 musb->is_active = 1; 505 musb_set_state(musb, OTG_STATE_A_IDLE); 506 MUSB_HST_MODE(musb); 507 508 return error; 509 } 510 EXPORT_SYMBOL_GPL(musb_set_host); 511 512 /** 513 * musb_set_peripheral - set and initialize peripheral mode 514 * @musb: musb controller driver data 515 * 516 * Clears devctl session bit and initializes things for peripheral 517 * mode and sets B_IDLE. SoC glue needs to advance state further 518 * based on phy provided VBUS state. 519 */ 520 int musb_set_peripheral(struct musb *musb) 521 { 522 int error = 0; 523 u8 devctl; 524 525 if (!musb) 526 return -EINVAL; 527 528 devctl = musb_read_devctl(musb); 529 if (devctl & MUSB_DEVCTL_BDEVICE) { 530 trace_musb_state(musb, devctl, "Already in peripheral mode"); 531 goto init_data; 532 } 533 534 devctl &= ~MUSB_DEVCTL_SESSION; 535 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 536 537 error = readx_poll_timeout(musb_read_devctl, musb, devctl, 538 devctl & MUSB_DEVCTL_BDEVICE, 5000, 539 1000000); 540 if (error) { 541 dev_err(musb->controller, "%s: could not set peripheral: %02x\n", 542 __func__, devctl); 543 544 return error; 545 } 546 547 devctl = musb_read_devctl(musb); 548 trace_musb_state(musb, devctl, "Peripheral mode set"); 549 550 init_data: 551 musb->is_active = 0; 552 musb_set_state(musb, OTG_STATE_B_IDLE); 553 MUSB_DEV_MODE(musb); 554 555 return error; 556 } 557 EXPORT_SYMBOL_GPL(musb_set_peripheral); 558 559 /*-------------------------------------------------------------------------*/ 560 561 /* for high speed test mode; see USB 2.0 spec 7.1.20 */ 562 static const u8 musb_test_packet[53] = { 563 /* implicit SYNC then DATA0 to start */ 564 565 /* JKJKJKJK x9 */ 566 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 567 /* JJKKJJKK x8 */ 568 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 569 /* JJJJKKKK x8 */ 570 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 571 /* JJJJJJJKKKKKKK x8 */ 572 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 573 /* JJJJJJJK x8 */ 574 0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 575 /* JKKKKKKK x10, JK */ 576 0xfc, 0x7e, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0x7e 577 578 /* implicit CRC16 then EOP to end */ 579 }; 580 581 void musb_load_testpacket(struct musb *musb) 582 { 583 void __iomem *regs = musb->endpoints[0].regs; 584 585 musb_ep_select(musb->mregs, 0); 586 musb_write_fifo(musb->control_ep, 587 sizeof(musb_test_packet), musb_test_packet); 588 musb_writew(regs, MUSB_CSR0, MUSB_CSR0_TXPKTRDY); 589 } 590 591 /*-------------------------------------------------------------------------*/ 592 593 /* 594 * Handles OTG hnp timeouts, such as b_ase0_brst 595 */ 596 static void musb_otg_timer_func(struct timer_list *t) 597 { 598 struct musb *musb = from_timer(musb, t, otg_timer); 599 unsigned long flags; 600 601 spin_lock_irqsave(&musb->lock, flags); 602 switch (musb_get_state(musb)) { 603 case OTG_STATE_B_WAIT_ACON: 604 musb_dbg(musb, 605 "HNP: b_wait_acon timeout; back to b_peripheral"); 606 musb_g_disconnect(musb); 607 musb_set_state(musb, OTG_STATE_B_PERIPHERAL); 608 musb->is_active = 0; 609 break; 610 case OTG_STATE_A_SUSPEND: 611 case OTG_STATE_A_WAIT_BCON: 612 musb_dbg(musb, "HNP: %s timeout", 613 musb_otg_state_string(musb)); 614 musb_platform_set_vbus(musb, 0); 615 musb_set_state(musb, OTG_STATE_A_WAIT_VFALL); 616 break; 617 default: 618 musb_dbg(musb, "HNP: Unhandled mode %s", 619 musb_otg_state_string(musb)); 620 } 621 spin_unlock_irqrestore(&musb->lock, flags); 622 } 623 624 /* 625 * Stops the HNP transition. Caller must take care of locking. 626 */ 627 void musb_hnp_stop(struct musb *musb) 628 { 629 struct usb_hcd *hcd = musb->hcd; 630 void __iomem *mbase = musb->mregs; 631 u8 reg; 632 633 musb_dbg(musb, "HNP: stop from %s", musb_otg_state_string(musb)); 634 635 switch (musb_get_state(musb)) { 636 case OTG_STATE_A_PERIPHERAL: 637 musb_g_disconnect(musb); 638 musb_dbg(musb, "HNP: back to %s", musb_otg_state_string(musb)); 639 break; 640 case OTG_STATE_B_HOST: 641 musb_dbg(musb, "HNP: Disabling HR"); 642 if (hcd) 643 hcd->self.is_b_host = 0; 644 musb_set_state(musb, OTG_STATE_B_PERIPHERAL); 645 MUSB_DEV_MODE(musb); 646 reg = musb_readb(mbase, MUSB_POWER); 647 reg |= MUSB_POWER_SUSPENDM; 648 musb_writeb(mbase, MUSB_POWER, reg); 649 /* REVISIT: Start SESSION_REQUEST here? */ 650 break; 651 default: 652 musb_dbg(musb, "HNP: Stopping in unknown state %s", 653 musb_otg_state_string(musb)); 654 } 655 656 /* 657 * When returning to A state after HNP, avoid hub_port_rebounce(), 658 * which cause occasional OPT A "Did not receive reset after connect" 659 * errors. 660 */ 661 musb->port1_status &= ~(USB_PORT_STAT_C_CONNECTION << 16); 662 } 663 664 static void musb_recover_from_babble(struct musb *musb); 665 666 static void musb_handle_intr_resume(struct musb *musb, u8 devctl) 667 { 668 musb_dbg(musb, "RESUME (%s)", musb_otg_state_string(musb)); 669 670 if (devctl & MUSB_DEVCTL_HM) { 671 switch (musb_get_state(musb)) { 672 case OTG_STATE_A_SUSPEND: 673 /* remote wakeup? */ 674 musb->port1_status |= 675 (USB_PORT_STAT_C_SUSPEND << 16) 676 | MUSB_PORT_STAT_RESUME; 677 musb->rh_timer = jiffies 678 + msecs_to_jiffies(USB_RESUME_TIMEOUT); 679 musb_set_state(musb, OTG_STATE_A_HOST); 680 musb->is_active = 1; 681 musb_host_resume_root_hub(musb); 682 schedule_delayed_work(&musb->finish_resume_work, 683 msecs_to_jiffies(USB_RESUME_TIMEOUT)); 684 break; 685 case OTG_STATE_B_WAIT_ACON: 686 musb_set_state(musb, OTG_STATE_B_PERIPHERAL); 687 musb->is_active = 1; 688 MUSB_DEV_MODE(musb); 689 break; 690 default: 691 WARNING("bogus %s RESUME (%s)\n", 692 "host", 693 musb_otg_state_string(musb)); 694 } 695 } else { 696 switch (musb_get_state(musb)) { 697 case OTG_STATE_A_SUSPEND: 698 /* possibly DISCONNECT is upcoming */ 699 musb_set_state(musb, OTG_STATE_A_HOST); 700 musb_host_resume_root_hub(musb); 701 break; 702 case OTG_STATE_B_WAIT_ACON: 703 case OTG_STATE_B_PERIPHERAL: 704 /* disconnect while suspended? we may 705 * not get a disconnect irq... 706 */ 707 if ((devctl & MUSB_DEVCTL_VBUS) 708 != (3 << MUSB_DEVCTL_VBUS_SHIFT) 709 ) { 710 musb->int_usb |= MUSB_INTR_DISCONNECT; 711 musb->int_usb &= ~MUSB_INTR_SUSPEND; 712 break; 713 } 714 musb_g_resume(musb); 715 break; 716 case OTG_STATE_B_IDLE: 717 musb->int_usb &= ~MUSB_INTR_SUSPEND; 718 break; 719 default: 720 WARNING("bogus %s RESUME (%s)\n", 721 "peripheral", 722 musb_otg_state_string(musb)); 723 } 724 } 725 } 726 727 /* return IRQ_HANDLED to tell the caller to return immediately */ 728 static irqreturn_t musb_handle_intr_sessreq(struct musb *musb, u8 devctl) 729 { 730 void __iomem *mbase = musb->mregs; 731 732 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS 733 && (devctl & MUSB_DEVCTL_BDEVICE)) { 734 musb_dbg(musb, "SessReq while on B state"); 735 return IRQ_HANDLED; 736 } 737 738 musb_dbg(musb, "SESSION_REQUEST (%s)", musb_otg_state_string(musb)); 739 740 /* IRQ arrives from ID pin sense or (later, if VBUS power 741 * is removed) SRP. responses are time critical: 742 * - turn on VBUS (with silicon-specific mechanism) 743 * - go through A_WAIT_VRISE 744 * - ... to A_WAIT_BCON. 745 * a_wait_vrise_tmout triggers VBUS_ERROR transitions 746 */ 747 musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION); 748 musb->ep0_stage = MUSB_EP0_START; 749 musb_set_state(musb, OTG_STATE_A_IDLE); 750 MUSB_HST_MODE(musb); 751 musb_platform_set_vbus(musb, 1); 752 753 return IRQ_NONE; 754 } 755 756 static void musb_handle_intr_vbuserr(struct musb *musb, u8 devctl) 757 { 758 int ignore = 0; 759 760 /* During connection as an A-Device, we may see a short 761 * current spikes causing voltage drop, because of cable 762 * and peripheral capacitance combined with vbus draw. 763 * (So: less common with truly self-powered devices, where 764 * vbus doesn't act like a power supply.) 765 * 766 * Such spikes are short; usually less than ~500 usec, max 767 * of ~2 msec. That is, they're not sustained overcurrent 768 * errors, though they're reported using VBUSERROR irqs. 769 * 770 * Workarounds: (a) hardware: use self powered devices. 771 * (b) software: ignore non-repeated VBUS errors. 772 * 773 * REVISIT: do delays from lots of DEBUG_KERNEL checks 774 * make trouble here, keeping VBUS < 4.4V ? 775 */ 776 switch (musb_get_state(musb)) { 777 case OTG_STATE_A_HOST: 778 /* recovery is dicey once we've gotten past the 779 * initial stages of enumeration, but if VBUS 780 * stayed ok at the other end of the link, and 781 * another reset is due (at least for high speed, 782 * to redo the chirp etc), it might work OK... 783 */ 784 case OTG_STATE_A_WAIT_BCON: 785 case OTG_STATE_A_WAIT_VRISE: 786 if (musb->vbuserr_retry) { 787 void __iomem *mbase = musb->mregs; 788 789 musb->vbuserr_retry--; 790 ignore = 1; 791 devctl |= MUSB_DEVCTL_SESSION; 792 musb_writeb(mbase, MUSB_DEVCTL, devctl); 793 } else { 794 musb->port1_status |= 795 USB_PORT_STAT_OVERCURRENT 796 | (USB_PORT_STAT_C_OVERCURRENT << 16); 797 } 798 break; 799 default: 800 break; 801 } 802 803 dev_printk(ignore ? KERN_DEBUG : KERN_ERR, musb->controller, 804 "VBUS_ERROR in %s (%02x, %s), retry #%d, port1 %08x\n", 805 musb_otg_state_string(musb), 806 devctl, 807 ({ char *s; 808 switch (devctl & MUSB_DEVCTL_VBUS) { 809 case 0 << MUSB_DEVCTL_VBUS_SHIFT: 810 s = "<SessEnd"; break; 811 case 1 << MUSB_DEVCTL_VBUS_SHIFT: 812 s = "<AValid"; break; 813 case 2 << MUSB_DEVCTL_VBUS_SHIFT: 814 s = "<VBusValid"; break; 815 /* case 3 << MUSB_DEVCTL_VBUS_SHIFT: */ 816 default: 817 s = "VALID"; break; 818 } s; }), 819 VBUSERR_RETRY_COUNT - musb->vbuserr_retry, 820 musb->port1_status); 821 822 /* go through A_WAIT_VFALL then start a new session */ 823 if (!ignore) 824 musb_platform_set_vbus(musb, 0); 825 } 826 827 static void musb_handle_intr_suspend(struct musb *musb, u8 devctl) 828 { 829 musb_dbg(musb, "SUSPEND (%s) devctl %02x", 830 musb_otg_state_string(musb), devctl); 831 832 switch (musb_get_state(musb)) { 833 case OTG_STATE_A_PERIPHERAL: 834 /* We also come here if the cable is removed, since 835 * this silicon doesn't report ID-no-longer-grounded. 836 * 837 * We depend on T(a_wait_bcon) to shut us down, and 838 * hope users don't do anything dicey during this 839 * undesired detour through A_WAIT_BCON. 840 */ 841 musb_hnp_stop(musb); 842 musb_host_resume_root_hub(musb); 843 musb_root_disconnect(musb); 844 musb_platform_try_idle(musb, jiffies 845 + msecs_to_jiffies(musb->a_wait_bcon 846 ? : OTG_TIME_A_WAIT_BCON)); 847 848 break; 849 case OTG_STATE_B_IDLE: 850 if (!musb->is_active) 851 break; 852 fallthrough; 853 case OTG_STATE_B_PERIPHERAL: 854 musb_g_suspend(musb); 855 musb->is_active = musb->g.b_hnp_enable; 856 if (musb->is_active) { 857 musb_set_state(musb, OTG_STATE_B_WAIT_ACON); 858 musb_dbg(musb, "HNP: Setting timer for b_ase0_brst"); 859 mod_timer(&musb->otg_timer, jiffies 860 + msecs_to_jiffies( 861 OTG_TIME_B_ASE0_BRST)); 862 } 863 break; 864 case OTG_STATE_A_WAIT_BCON: 865 if (musb->a_wait_bcon != 0) 866 musb_platform_try_idle(musb, jiffies 867 + msecs_to_jiffies(musb->a_wait_bcon)); 868 break; 869 case OTG_STATE_A_HOST: 870 musb_set_state(musb, OTG_STATE_A_SUSPEND); 871 musb->is_active = musb->hcd->self.b_hnp_enable; 872 break; 873 case OTG_STATE_B_HOST: 874 /* Transition to B_PERIPHERAL, see 6.8.2.6 p 44 */ 875 musb_dbg(musb, "REVISIT: SUSPEND as B_HOST"); 876 break; 877 default: 878 /* "should not happen" */ 879 musb->is_active = 0; 880 break; 881 } 882 } 883 884 static void musb_handle_intr_connect(struct musb *musb, u8 devctl, u8 int_usb) 885 { 886 struct usb_hcd *hcd = musb->hcd; 887 888 musb->is_active = 1; 889 musb->ep0_stage = MUSB_EP0_START; 890 891 musb->intrtxe = musb->epmask; 892 musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe); 893 musb->intrrxe = musb->epmask & 0xfffe; 894 musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe); 895 musb_writeb(musb->mregs, MUSB_INTRUSBE, 0xf7); 896 musb->port1_status &= ~(USB_PORT_STAT_LOW_SPEED 897 |USB_PORT_STAT_HIGH_SPEED 898 |USB_PORT_STAT_ENABLE 899 ); 900 musb->port1_status |= USB_PORT_STAT_CONNECTION 901 |(USB_PORT_STAT_C_CONNECTION << 16); 902 903 /* high vs full speed is just a guess until after reset */ 904 if (devctl & MUSB_DEVCTL_LSDEV) 905 musb->port1_status |= USB_PORT_STAT_LOW_SPEED; 906 907 /* indicate new connection to OTG machine */ 908 switch (musb_get_state(musb)) { 909 case OTG_STATE_B_PERIPHERAL: 910 if (int_usb & MUSB_INTR_SUSPEND) { 911 musb_dbg(musb, "HNP: SUSPEND+CONNECT, now b_host"); 912 int_usb &= ~MUSB_INTR_SUSPEND; 913 goto b_host; 914 } else 915 musb_dbg(musb, "CONNECT as b_peripheral???"); 916 break; 917 case OTG_STATE_B_WAIT_ACON: 918 musb_dbg(musb, "HNP: CONNECT, now b_host"); 919 b_host: 920 musb_set_state(musb, OTG_STATE_B_HOST); 921 if (musb->hcd) 922 musb->hcd->self.is_b_host = 1; 923 del_timer(&musb->otg_timer); 924 break; 925 default: 926 if ((devctl & MUSB_DEVCTL_VBUS) 927 == (3 << MUSB_DEVCTL_VBUS_SHIFT)) { 928 musb_set_state(musb, OTG_STATE_A_HOST); 929 if (hcd) 930 hcd->self.is_b_host = 0; 931 } 932 break; 933 } 934 935 musb_host_poke_root_hub(musb); 936 937 musb_dbg(musb, "CONNECT (%s) devctl %02x", 938 musb_otg_state_string(musb), devctl); 939 } 940 941 static void musb_handle_intr_disconnect(struct musb *musb, u8 devctl) 942 { 943 musb_dbg(musb, "DISCONNECT (%s) as %s, devctl %02x", 944 musb_otg_state_string(musb), 945 MUSB_MODE(musb), devctl); 946 947 switch (musb_get_state(musb)) { 948 case OTG_STATE_A_HOST: 949 case OTG_STATE_A_SUSPEND: 950 musb_host_resume_root_hub(musb); 951 musb_root_disconnect(musb); 952 if (musb->a_wait_bcon != 0) 953 musb_platform_try_idle(musb, jiffies 954 + msecs_to_jiffies(musb->a_wait_bcon)); 955 break; 956 case OTG_STATE_B_HOST: 957 /* REVISIT this behaves for "real disconnect" 958 * cases; make sure the other transitions from 959 * from B_HOST act right too. The B_HOST code 960 * in hnp_stop() is currently not used... 961 */ 962 musb_root_disconnect(musb); 963 if (musb->hcd) 964 musb->hcd->self.is_b_host = 0; 965 musb_set_state(musb, OTG_STATE_B_PERIPHERAL); 966 MUSB_DEV_MODE(musb); 967 musb_g_disconnect(musb); 968 break; 969 case OTG_STATE_A_PERIPHERAL: 970 musb_hnp_stop(musb); 971 musb_root_disconnect(musb); 972 fallthrough; 973 case OTG_STATE_B_WAIT_ACON: 974 case OTG_STATE_B_PERIPHERAL: 975 case OTG_STATE_B_IDLE: 976 musb_g_disconnect(musb); 977 break; 978 default: 979 WARNING("unhandled DISCONNECT transition (%s)\n", 980 musb_otg_state_string(musb)); 981 break; 982 } 983 } 984 985 /* 986 * mentor saves a bit: bus reset and babble share the same irq. 987 * only host sees babble; only peripheral sees bus reset. 988 */ 989 static void musb_handle_intr_reset(struct musb *musb) 990 { 991 if (is_host_active(musb)) { 992 /* 993 * When BABBLE happens what we can depends on which 994 * platform MUSB is running, because some platforms 995 * implemented proprietary means for 'recovering' from 996 * Babble conditions. One such platform is AM335x. In 997 * most cases, however, the only thing we can do is 998 * drop the session. 999 */ 1000 dev_err(musb->controller, "Babble\n"); 1001 musb_recover_from_babble(musb); 1002 } else { 1003 musb_dbg(musb, "BUS RESET as %s", musb_otg_state_string(musb)); 1004 switch (musb_get_state(musb)) { 1005 case OTG_STATE_A_SUSPEND: 1006 musb_g_reset(musb); 1007 fallthrough; 1008 case OTG_STATE_A_WAIT_BCON: /* OPT TD.4.7-900ms */ 1009 /* never use invalid T(a_wait_bcon) */ 1010 musb_dbg(musb, "HNP: in %s, %d msec timeout", 1011 musb_otg_state_string(musb), 1012 TA_WAIT_BCON(musb)); 1013 mod_timer(&musb->otg_timer, jiffies 1014 + msecs_to_jiffies(TA_WAIT_BCON(musb))); 1015 break; 1016 case OTG_STATE_A_PERIPHERAL: 1017 del_timer(&musb->otg_timer); 1018 musb_g_reset(musb); 1019 break; 1020 case OTG_STATE_B_WAIT_ACON: 1021 musb_dbg(musb, "HNP: RESET (%s), to b_peripheral", 1022 musb_otg_state_string(musb)); 1023 musb_set_state(musb, OTG_STATE_B_PERIPHERAL); 1024 musb_g_reset(musb); 1025 break; 1026 case OTG_STATE_B_IDLE: 1027 musb_set_state(musb, OTG_STATE_B_PERIPHERAL); 1028 fallthrough; 1029 case OTG_STATE_B_PERIPHERAL: 1030 musb_g_reset(musb); 1031 break; 1032 default: 1033 musb_dbg(musb, "Unhandled BUS RESET as %s", 1034 musb_otg_state_string(musb)); 1035 } 1036 } 1037 } 1038 1039 /* 1040 * Interrupt Service Routine to record USB "global" interrupts. 1041 * Since these do not happen often and signify things of 1042 * paramount importance, it seems OK to check them individually; 1043 * the order of the tests is specified in the manual 1044 * 1045 * @param musb instance pointer 1046 * @param int_usb register contents 1047 * @param devctl 1048 */ 1049 1050 static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb, 1051 u8 devctl) 1052 { 1053 irqreturn_t handled = IRQ_NONE; 1054 1055 musb_dbg(musb, "<== DevCtl=%02x, int_usb=0x%x", devctl, int_usb); 1056 1057 /* in host mode, the peripheral may issue remote wakeup. 1058 * in peripheral mode, the host may resume the link. 1059 * spurious RESUME irqs happen too, paired with SUSPEND. 1060 */ 1061 if (int_usb & MUSB_INTR_RESUME) { 1062 musb_handle_intr_resume(musb, devctl); 1063 handled = IRQ_HANDLED; 1064 } 1065 1066 /* see manual for the order of the tests */ 1067 if (int_usb & MUSB_INTR_SESSREQ) { 1068 if (musb_handle_intr_sessreq(musb, devctl)) 1069 return IRQ_HANDLED; 1070 handled = IRQ_HANDLED; 1071 } 1072 1073 if (int_usb & MUSB_INTR_VBUSERROR) { 1074 musb_handle_intr_vbuserr(musb, devctl); 1075 handled = IRQ_HANDLED; 1076 } 1077 1078 if (int_usb & MUSB_INTR_SUSPEND) { 1079 musb_handle_intr_suspend(musb, devctl); 1080 handled = IRQ_HANDLED; 1081 } 1082 1083 if (int_usb & MUSB_INTR_CONNECT) { 1084 musb_handle_intr_connect(musb, devctl, int_usb); 1085 handled = IRQ_HANDLED; 1086 } 1087 1088 if (int_usb & MUSB_INTR_DISCONNECT) { 1089 musb_handle_intr_disconnect(musb, devctl); 1090 handled = IRQ_HANDLED; 1091 } 1092 1093 if (int_usb & MUSB_INTR_RESET) { 1094 musb_handle_intr_reset(musb); 1095 handled = IRQ_HANDLED; 1096 } 1097 1098 #if 0 1099 /* REVISIT ... this would be for multiplexing periodic endpoints, or 1100 * supporting transfer phasing to prevent exceeding ISO bandwidth 1101 * limits of a given frame or microframe. 1102 * 1103 * It's not needed for peripheral side, which dedicates endpoints; 1104 * though it _might_ use SOF irqs for other purposes. 1105 * 1106 * And it's not currently needed for host side, which also dedicates 1107 * endpoints, relies on TX/RX interval registers, and isn't claimed 1108 * to support ISO transfers yet. 1109 */ 1110 if (int_usb & MUSB_INTR_SOF) { 1111 void __iomem *mbase = musb->mregs; 1112 struct musb_hw_ep *ep; 1113 u8 epnum; 1114 u16 frame; 1115 1116 dev_dbg(musb->controller, "START_OF_FRAME\n"); 1117 handled = IRQ_HANDLED; 1118 1119 /* start any periodic Tx transfers waiting for current frame */ 1120 frame = musb_readw(mbase, MUSB_FRAME); 1121 ep = musb->endpoints; 1122 for (epnum = 1; (epnum < musb->nr_endpoints) 1123 && (musb->epmask >= (1 << epnum)); 1124 epnum++, ep++) { 1125 /* 1126 * FIXME handle framecounter wraps (12 bits) 1127 * eliminate duplicated StartUrb logic 1128 */ 1129 if (ep->dwWaitFrame >= frame) { 1130 ep->dwWaitFrame = 0; 1131 pr_debug("SOF --> periodic TX%s on %d\n", 1132 ep->tx_channel ? " DMA" : "", 1133 epnum); 1134 if (!ep->tx_channel) 1135 musb_h_tx_start(musb, epnum); 1136 else 1137 cppi_hostdma_start(musb, epnum); 1138 } 1139 } /* end of for loop */ 1140 } 1141 #endif 1142 1143 schedule_delayed_work(&musb->irq_work, 0); 1144 1145 return handled; 1146 } 1147 1148 /*-------------------------------------------------------------------------*/ 1149 1150 static void musb_disable_interrupts(struct musb *musb) 1151 { 1152 void __iomem *mbase = musb->mregs; 1153 1154 /* disable interrupts */ 1155 musb_writeb(mbase, MUSB_INTRUSBE, 0); 1156 musb->intrtxe = 0; 1157 musb_writew(mbase, MUSB_INTRTXE, 0); 1158 musb->intrrxe = 0; 1159 musb_writew(mbase, MUSB_INTRRXE, 0); 1160 1161 /* flush pending interrupts */ 1162 musb_clearb(mbase, MUSB_INTRUSB); 1163 musb_clearw(mbase, MUSB_INTRTX); 1164 musb_clearw(mbase, MUSB_INTRRX); 1165 } 1166 1167 static void musb_enable_interrupts(struct musb *musb) 1168 { 1169 void __iomem *regs = musb->mregs; 1170 1171 /* Set INT enable registers, enable interrupts */ 1172 musb->intrtxe = musb->epmask; 1173 musb_writew(regs, MUSB_INTRTXE, musb->intrtxe); 1174 musb->intrrxe = musb->epmask & 0xfffe; 1175 musb_writew(regs, MUSB_INTRRXE, musb->intrrxe); 1176 musb_writeb(regs, MUSB_INTRUSBE, 0xf7); 1177 1178 } 1179 1180 /* 1181 * Program the HDRC to start (enable interrupts, dma, etc.). 1182 */ 1183 void musb_start(struct musb *musb) 1184 { 1185 void __iomem *regs = musb->mregs; 1186 u8 devctl = musb_readb(regs, MUSB_DEVCTL); 1187 u8 power; 1188 1189 musb_dbg(musb, "<== devctl %02x", devctl); 1190 1191 musb_enable_interrupts(musb); 1192 musb_writeb(regs, MUSB_TESTMODE, 0); 1193 1194 power = MUSB_POWER_ISOUPDATE; 1195 /* 1196 * treating UNKNOWN as unspecified maximum speed, in which case 1197 * we will default to high-speed. 1198 */ 1199 if (musb->config->maximum_speed == USB_SPEED_HIGH || 1200 musb->config->maximum_speed == USB_SPEED_UNKNOWN) 1201 power |= MUSB_POWER_HSENAB; 1202 musb_writeb(regs, MUSB_POWER, power); 1203 1204 musb->is_active = 0; 1205 devctl = musb_readb(regs, MUSB_DEVCTL); 1206 devctl &= ~MUSB_DEVCTL_SESSION; 1207 1208 /* session started after: 1209 * (a) ID-grounded irq, host mode; 1210 * (b) vbus present/connect IRQ, peripheral mode; 1211 * (c) peripheral initiates, using SRP 1212 */ 1213 if (musb->port_mode != MUSB_HOST && 1214 musb_get_state(musb) != OTG_STATE_A_WAIT_BCON && 1215 (devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) { 1216 musb->is_active = 1; 1217 } else { 1218 devctl |= MUSB_DEVCTL_SESSION; 1219 } 1220 1221 musb_platform_enable(musb); 1222 musb_writeb(regs, MUSB_DEVCTL, devctl); 1223 } 1224 1225 /* 1226 * Make the HDRC stop (disable interrupts, etc.); 1227 * reversible by musb_start 1228 * called on gadget driver unregister 1229 * with controller locked, irqs blocked 1230 * acts as a NOP unless some role activated the hardware 1231 */ 1232 void musb_stop(struct musb *musb) 1233 { 1234 /* stop IRQs, timers, ... */ 1235 musb_platform_disable(musb); 1236 musb_disable_interrupts(musb); 1237 musb_writeb(musb->mregs, MUSB_DEVCTL, 0); 1238 1239 /* FIXME 1240 * - mark host and/or peripheral drivers unusable/inactive 1241 * - disable DMA (and enable it in HdrcStart) 1242 * - make sure we can musb_start() after musb_stop(); with 1243 * OTG mode, gadget driver module rmmod/modprobe cycles that 1244 * - ... 1245 */ 1246 musb_platform_try_idle(musb, 0); 1247 } 1248 1249 /*-------------------------------------------------------------------------*/ 1250 1251 /* 1252 * The silicon either has hard-wired endpoint configurations, or else 1253 * "dynamic fifo" sizing. The driver has support for both, though at this 1254 * writing only the dynamic sizing is very well tested. Since we switched 1255 * away from compile-time hardware parameters, we can no longer rely on 1256 * dead code elimination to leave only the relevant one in the object file. 1257 * 1258 * We don't currently use dynamic fifo setup capability to do anything 1259 * more than selecting one of a bunch of predefined configurations. 1260 */ 1261 static ushort fifo_mode; 1262 1263 /* "modprobe ... fifo_mode=1" etc */ 1264 module_param(fifo_mode, ushort, 0); 1265 MODULE_PARM_DESC(fifo_mode, "initial endpoint configuration"); 1266 1267 /* 1268 * tables defining fifo_mode values. define more if you like. 1269 * for host side, make sure both halves of ep1 are set up. 1270 */ 1271 1272 /* mode 0 - fits in 2KB */ 1273 static struct musb_fifo_cfg mode_0_cfg[] = { 1274 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, 1275 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, 1276 { .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, }, 1277 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, }, 1278 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, }, 1279 }; 1280 1281 /* mode 1 - fits in 4KB */ 1282 static struct musb_fifo_cfg mode_1_cfg[] = { 1283 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, }, 1284 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, }, 1285 { .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, .mode = BUF_DOUBLE, }, 1286 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, }, 1287 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, }, 1288 }; 1289 1290 /* mode 2 - fits in 4KB */ 1291 static struct musb_fifo_cfg mode_2_cfg[] = { 1292 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, 1293 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, 1294 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, 1295 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, 1296 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 960, }, 1297 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 1024, }, 1298 }; 1299 1300 /* mode 3 - fits in 4KB */ 1301 static struct musb_fifo_cfg mode_3_cfg[] = { 1302 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, }, 1303 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, }, 1304 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, 1305 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, 1306 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, }, 1307 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, }, 1308 }; 1309 1310 /* mode 4 - fits in 16KB */ 1311 static struct musb_fifo_cfg mode_4_cfg[] = { 1312 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, 1313 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, 1314 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, 1315 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, 1316 { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, }, 1317 { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, }, 1318 { .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, }, 1319 { .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, }, 1320 { .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, }, 1321 { .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, }, 1322 { .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 512, }, 1323 { .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 512, }, 1324 { .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, }, 1325 { .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 512, }, 1326 { .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 512, }, 1327 { .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 512, }, 1328 { .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 512, }, 1329 { .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 512, }, 1330 { .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 256, }, 1331 { .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 64, }, 1332 { .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 256, }, 1333 { .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 64, }, 1334 { .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 256, }, 1335 { .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 64, }, 1336 { .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 4096, }, 1337 { .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, }, 1338 { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, }, 1339 }; 1340 1341 /* mode 5 - fits in 8KB */ 1342 static struct musb_fifo_cfg mode_5_cfg[] = { 1343 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, 1344 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, 1345 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, 1346 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, 1347 { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, }, 1348 { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, }, 1349 { .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, }, 1350 { .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, }, 1351 { .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, }, 1352 { .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, }, 1353 { .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 32, }, 1354 { .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 32, }, 1355 { .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 32, }, 1356 { .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 32, }, 1357 { .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 32, }, 1358 { .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 32, }, 1359 { .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 32, }, 1360 { .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 32, }, 1361 { .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 32, }, 1362 { .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 32, }, 1363 { .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 32, }, 1364 { .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 32, }, 1365 { .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 32, }, 1366 { .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 32, }, 1367 { .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 512, }, 1368 { .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, }, 1369 { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, }, 1370 }; 1371 1372 /* 1373 * configure a fifo; for non-shared endpoints, this may be called 1374 * once for a tx fifo and once for an rx fifo. 1375 * 1376 * returns negative errno or offset for next fifo. 1377 */ 1378 static int 1379 fifo_setup(struct musb *musb, struct musb_hw_ep *hw_ep, 1380 const struct musb_fifo_cfg *cfg, u16 offset) 1381 { 1382 void __iomem *mbase = musb->mregs; 1383 int size = 0; 1384 u16 maxpacket = cfg->maxpacket; 1385 u16 c_off = offset >> 3; 1386 u8 c_size; 1387 1388 /* expect hw_ep has already been zero-initialized */ 1389 1390 size = ffs(max(maxpacket, (u16) 8)) - 1; 1391 maxpacket = 1 << size; 1392 1393 c_size = size - 3; 1394 if (cfg->mode == BUF_DOUBLE) { 1395 if ((offset + (maxpacket << 1)) > 1396 (1 << (musb->config->ram_bits + 2))) 1397 return -EMSGSIZE; 1398 c_size |= MUSB_FIFOSZ_DPB; 1399 } else { 1400 if ((offset + maxpacket) > (1 << (musb->config->ram_bits + 2))) 1401 return -EMSGSIZE; 1402 } 1403 1404 /* configure the FIFO */ 1405 musb_writeb(mbase, MUSB_INDEX, hw_ep->epnum); 1406 1407 /* EP0 reserved endpoint for control, bidirectional; 1408 * EP1 reserved for bulk, two unidirectional halves. 1409 */ 1410 if (hw_ep->epnum == 1) 1411 musb->bulk_ep = hw_ep; 1412 /* REVISIT error check: be sure ep0 can both rx and tx ... */ 1413 switch (cfg->style) { 1414 case FIFO_TX: 1415 musb_writeb(mbase, MUSB_TXFIFOSZ, c_size); 1416 musb_writew(mbase, MUSB_TXFIFOADD, c_off); 1417 hw_ep->tx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB); 1418 hw_ep->max_packet_sz_tx = maxpacket; 1419 break; 1420 case FIFO_RX: 1421 musb_writeb(mbase, MUSB_RXFIFOSZ, c_size); 1422 musb_writew(mbase, MUSB_RXFIFOADD, c_off); 1423 hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB); 1424 hw_ep->max_packet_sz_rx = maxpacket; 1425 break; 1426 case FIFO_RXTX: 1427 musb_writeb(mbase, MUSB_TXFIFOSZ, c_size); 1428 musb_writew(mbase, MUSB_TXFIFOADD, c_off); 1429 hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB); 1430 hw_ep->max_packet_sz_rx = maxpacket; 1431 1432 musb_writeb(mbase, MUSB_RXFIFOSZ, c_size); 1433 musb_writew(mbase, MUSB_RXFIFOADD, c_off); 1434 hw_ep->tx_double_buffered = hw_ep->rx_double_buffered; 1435 hw_ep->max_packet_sz_tx = maxpacket; 1436 1437 hw_ep->is_shared_fifo = true; 1438 break; 1439 } 1440 1441 /* NOTE rx and tx endpoint irqs aren't managed separately, 1442 * which happens to be ok 1443 */ 1444 musb->epmask |= (1 << hw_ep->epnum); 1445 1446 return offset + (maxpacket << ((c_size & MUSB_FIFOSZ_DPB) ? 1 : 0)); 1447 } 1448 1449 static struct musb_fifo_cfg ep0_cfg = { 1450 .style = FIFO_RXTX, .maxpacket = 64, 1451 }; 1452 1453 static int ep_config_from_table(struct musb *musb) 1454 { 1455 const struct musb_fifo_cfg *cfg; 1456 unsigned i, n; 1457 int offset; 1458 struct musb_hw_ep *hw_ep = musb->endpoints; 1459 1460 if (musb->config->fifo_cfg) { 1461 cfg = musb->config->fifo_cfg; 1462 n = musb->config->fifo_cfg_size; 1463 goto done; 1464 } 1465 1466 switch (fifo_mode) { 1467 default: 1468 fifo_mode = 0; 1469 fallthrough; 1470 case 0: 1471 cfg = mode_0_cfg; 1472 n = ARRAY_SIZE(mode_0_cfg); 1473 break; 1474 case 1: 1475 cfg = mode_1_cfg; 1476 n = ARRAY_SIZE(mode_1_cfg); 1477 break; 1478 case 2: 1479 cfg = mode_2_cfg; 1480 n = ARRAY_SIZE(mode_2_cfg); 1481 break; 1482 case 3: 1483 cfg = mode_3_cfg; 1484 n = ARRAY_SIZE(mode_3_cfg); 1485 break; 1486 case 4: 1487 cfg = mode_4_cfg; 1488 n = ARRAY_SIZE(mode_4_cfg); 1489 break; 1490 case 5: 1491 cfg = mode_5_cfg; 1492 n = ARRAY_SIZE(mode_5_cfg); 1493 break; 1494 } 1495 1496 pr_debug("%s: setup fifo_mode %d\n", musb_driver_name, fifo_mode); 1497 1498 1499 done: 1500 offset = fifo_setup(musb, hw_ep, &ep0_cfg, 0); 1501 /* assert(offset > 0) */ 1502 1503 /* NOTE: for RTL versions >= 1.400 EPINFO and RAMINFO would 1504 * be better than static musb->config->num_eps and DYN_FIFO_SIZE... 1505 */ 1506 1507 for (i = 0; i < n; i++) { 1508 u8 epn = cfg->hw_ep_num; 1509 1510 if (epn >= musb->config->num_eps) { 1511 pr_debug("%s: invalid ep %d\n", 1512 musb_driver_name, epn); 1513 return -EINVAL; 1514 } 1515 offset = fifo_setup(musb, hw_ep + epn, cfg++, offset); 1516 if (offset < 0) { 1517 pr_debug("%s: mem overrun, ep %d\n", 1518 musb_driver_name, epn); 1519 return offset; 1520 } 1521 epn++; 1522 musb->nr_endpoints = max(epn, musb->nr_endpoints); 1523 } 1524 1525 pr_debug("%s: %d/%d max ep, %d/%d memory\n", 1526 musb_driver_name, 1527 n + 1, musb->config->num_eps * 2 - 1, 1528 offset, (1 << (musb->config->ram_bits + 2))); 1529 1530 if (!musb->bulk_ep) { 1531 pr_debug("%s: missing bulk\n", musb_driver_name); 1532 return -EINVAL; 1533 } 1534 1535 return 0; 1536 } 1537 1538 1539 /* 1540 * ep_config_from_hw - when MUSB_C_DYNFIFO_DEF is false 1541 * @param musb the controller 1542 */ 1543 static int ep_config_from_hw(struct musb *musb) 1544 { 1545 u8 epnum = 0; 1546 struct musb_hw_ep *hw_ep; 1547 void __iomem *mbase = musb->mregs; 1548 int ret = 0; 1549 1550 musb_dbg(musb, "<== static silicon ep config"); 1551 1552 /* FIXME pick up ep0 maxpacket size */ 1553 1554 for (epnum = 1; epnum < musb->config->num_eps; epnum++) { 1555 musb_ep_select(mbase, epnum); 1556 hw_ep = musb->endpoints + epnum; 1557 1558 ret = musb_read_fifosize(musb, hw_ep, epnum); 1559 if (ret < 0) 1560 break; 1561 1562 /* FIXME set up hw_ep->{rx,tx}_double_buffered */ 1563 1564 /* pick an RX/TX endpoint for bulk */ 1565 if (hw_ep->max_packet_sz_tx < 512 1566 || hw_ep->max_packet_sz_rx < 512) 1567 continue; 1568 1569 /* REVISIT: this algorithm is lazy, we should at least 1570 * try to pick a double buffered endpoint. 1571 */ 1572 if (musb->bulk_ep) 1573 continue; 1574 musb->bulk_ep = hw_ep; 1575 } 1576 1577 if (!musb->bulk_ep) { 1578 pr_debug("%s: missing bulk\n", musb_driver_name); 1579 return -EINVAL; 1580 } 1581 1582 return 0; 1583 } 1584 1585 enum { MUSB_CONTROLLER_MHDRC, MUSB_CONTROLLER_HDRC, }; 1586 1587 /* Initialize MUSB (M)HDRC part of the USB hardware subsystem; 1588 * configure endpoints, or take their config from silicon 1589 */ 1590 static int musb_core_init(u16 musb_type, struct musb *musb) 1591 { 1592 u8 reg; 1593 char *type; 1594 char aInfo[90]; 1595 void __iomem *mbase = musb->mregs; 1596 int status = 0; 1597 int i; 1598 1599 /* log core options (read using indexed model) */ 1600 reg = musb_read_configdata(mbase); 1601 1602 strcpy(aInfo, (reg & MUSB_CONFIGDATA_UTMIDW) ? "UTMI-16" : "UTMI-8"); 1603 if (reg & MUSB_CONFIGDATA_DYNFIFO) { 1604 strcat(aInfo, ", dyn FIFOs"); 1605 musb->dyn_fifo = true; 1606 } 1607 if (reg & MUSB_CONFIGDATA_MPRXE) { 1608 strcat(aInfo, ", bulk combine"); 1609 musb->bulk_combine = true; 1610 } 1611 if (reg & MUSB_CONFIGDATA_MPTXE) { 1612 strcat(aInfo, ", bulk split"); 1613 musb->bulk_split = true; 1614 } 1615 if (reg & MUSB_CONFIGDATA_HBRXE) { 1616 strcat(aInfo, ", HB-ISO Rx"); 1617 musb->hb_iso_rx = true; 1618 } 1619 if (reg & MUSB_CONFIGDATA_HBTXE) { 1620 strcat(aInfo, ", HB-ISO Tx"); 1621 musb->hb_iso_tx = true; 1622 } 1623 if (reg & MUSB_CONFIGDATA_SOFTCONE) 1624 strcat(aInfo, ", SoftConn"); 1625 1626 pr_debug("%s: ConfigData=0x%02x (%s)\n", musb_driver_name, reg, aInfo); 1627 1628 if (MUSB_CONTROLLER_MHDRC == musb_type) { 1629 musb->is_multipoint = 1; 1630 type = "M"; 1631 } else { 1632 musb->is_multipoint = 0; 1633 type = ""; 1634 if (IS_ENABLED(CONFIG_USB) && 1635 !IS_ENABLED(CONFIG_USB_OTG_DISABLE_EXTERNAL_HUB)) { 1636 pr_err("%s: kernel must disable external hubs, please fix the configuration\n", 1637 musb_driver_name); 1638 } 1639 } 1640 1641 /* log release info */ 1642 musb->hwvers = musb_readw(mbase, MUSB_HWVERS); 1643 pr_debug("%s: %sHDRC RTL version %d.%d%s\n", 1644 musb_driver_name, type, MUSB_HWVERS_MAJOR(musb->hwvers), 1645 MUSB_HWVERS_MINOR(musb->hwvers), 1646 (musb->hwvers & MUSB_HWVERS_RC) ? "RC" : ""); 1647 1648 /* configure ep0 */ 1649 musb_configure_ep0(musb); 1650 1651 /* discover endpoint configuration */ 1652 musb->nr_endpoints = 1; 1653 musb->epmask = 1; 1654 1655 if (musb->dyn_fifo) 1656 status = ep_config_from_table(musb); 1657 else 1658 status = ep_config_from_hw(musb); 1659 1660 if (status < 0) 1661 return status; 1662 1663 /* finish init, and print endpoint config */ 1664 for (i = 0; i < musb->nr_endpoints; i++) { 1665 struct musb_hw_ep *hw_ep = musb->endpoints + i; 1666 1667 hw_ep->fifo = musb->io.fifo_offset(i) + mbase; 1668 #if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010) 1669 if (musb->ops->quirks & MUSB_IN_TUSB) { 1670 hw_ep->fifo_async = musb->async + 0x400 + 1671 musb->io.fifo_offset(i); 1672 hw_ep->fifo_sync = musb->sync + 0x400 + 1673 musb->io.fifo_offset(i); 1674 hw_ep->fifo_sync_va = 1675 musb->sync_va + 0x400 + musb->io.fifo_offset(i); 1676 1677 if (i == 0) 1678 hw_ep->conf = mbase - 0x400 + TUSB_EP0_CONF; 1679 else 1680 hw_ep->conf = mbase + 0x400 + 1681 (((i - 1) & 0xf) << 2); 1682 } 1683 #endif 1684 1685 hw_ep->regs = musb->io.ep_offset(i, 0) + mbase; 1686 hw_ep->rx_reinit = 1; 1687 hw_ep->tx_reinit = 1; 1688 1689 if (hw_ep->max_packet_sz_tx) { 1690 musb_dbg(musb, "%s: hw_ep %d%s, %smax %d", 1691 musb_driver_name, i, 1692 hw_ep->is_shared_fifo ? "shared" : "tx", 1693 hw_ep->tx_double_buffered 1694 ? "doublebuffer, " : "", 1695 hw_ep->max_packet_sz_tx); 1696 } 1697 if (hw_ep->max_packet_sz_rx && !hw_ep->is_shared_fifo) { 1698 musb_dbg(musb, "%s: hw_ep %d%s, %smax %d", 1699 musb_driver_name, i, 1700 "rx", 1701 hw_ep->rx_double_buffered 1702 ? "doublebuffer, " : "", 1703 hw_ep->max_packet_sz_rx); 1704 } 1705 if (!(hw_ep->max_packet_sz_tx || hw_ep->max_packet_sz_rx)) 1706 musb_dbg(musb, "hw_ep %d not configured", i); 1707 } 1708 1709 return 0; 1710 } 1711 1712 /*-------------------------------------------------------------------------*/ 1713 1714 /* 1715 * handle all the irqs defined by the HDRC core. for now we expect: other 1716 * irq sources (phy, dma, etc) will be handled first, musb->int_* values 1717 * will be assigned, and the irq will already have been acked. 1718 * 1719 * called in irq context with spinlock held, irqs blocked 1720 */ 1721 irqreturn_t musb_interrupt(struct musb *musb) 1722 { 1723 irqreturn_t retval = IRQ_NONE; 1724 unsigned long status; 1725 unsigned long epnum; 1726 u8 devctl; 1727 1728 if (!musb->int_usb && !musb->int_tx && !musb->int_rx) 1729 return IRQ_NONE; 1730 1731 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 1732 1733 trace_musb_isr(musb); 1734 1735 /** 1736 * According to Mentor Graphics' documentation, flowchart on page 98, 1737 * IRQ should be handled as follows: 1738 * 1739 * . Resume IRQ 1740 * . Session Request IRQ 1741 * . VBUS Error IRQ 1742 * . Suspend IRQ 1743 * . Connect IRQ 1744 * . Disconnect IRQ 1745 * . Reset/Babble IRQ 1746 * . SOF IRQ (we're not using this one) 1747 * . Endpoint 0 IRQ 1748 * . TX Endpoints 1749 * . RX Endpoints 1750 * 1751 * We will be following that flowchart in order to avoid any problems 1752 * that might arise with internal Finite State Machine. 1753 */ 1754 1755 if (musb->int_usb) 1756 retval |= musb_stage0_irq(musb, musb->int_usb, devctl); 1757 1758 if (musb->int_tx & 1) { 1759 if (is_host_active(musb)) 1760 retval |= musb_h_ep0_irq(musb); 1761 else 1762 retval |= musb_g_ep0_irq(musb); 1763 1764 /* we have just handled endpoint 0 IRQ, clear it */ 1765 musb->int_tx &= ~BIT(0); 1766 } 1767 1768 status = musb->int_tx; 1769 1770 for_each_set_bit(epnum, &status, 16) { 1771 retval = IRQ_HANDLED; 1772 if (is_host_active(musb)) 1773 musb_host_tx(musb, epnum); 1774 else 1775 musb_g_tx(musb, epnum); 1776 } 1777 1778 status = musb->int_rx; 1779 1780 for_each_set_bit(epnum, &status, 16) { 1781 retval = IRQ_HANDLED; 1782 if (is_host_active(musb)) 1783 musb_host_rx(musb, epnum); 1784 else 1785 musb_g_rx(musb, epnum); 1786 } 1787 1788 return retval; 1789 } 1790 EXPORT_SYMBOL_GPL(musb_interrupt); 1791 1792 #ifndef CONFIG_MUSB_PIO_ONLY 1793 static bool use_dma = true; 1794 1795 /* "modprobe ... use_dma=0" etc */ 1796 module_param(use_dma, bool, 0644); 1797 MODULE_PARM_DESC(use_dma, "enable/disable use of DMA"); 1798 1799 void musb_dma_completion(struct musb *musb, u8 epnum, u8 transmit) 1800 { 1801 /* called with controller lock already held */ 1802 1803 if (!epnum) { 1804 if (!is_cppi_enabled(musb)) { 1805 /* endpoint 0 */ 1806 if (is_host_active(musb)) 1807 musb_h_ep0_irq(musb); 1808 else 1809 musb_g_ep0_irq(musb); 1810 } 1811 } else { 1812 /* endpoints 1..15 */ 1813 if (transmit) { 1814 if (is_host_active(musb)) 1815 musb_host_tx(musb, epnum); 1816 else 1817 musb_g_tx(musb, epnum); 1818 } else { 1819 /* receive */ 1820 if (is_host_active(musb)) 1821 musb_host_rx(musb, epnum); 1822 else 1823 musb_g_rx(musb, epnum); 1824 } 1825 } 1826 } 1827 EXPORT_SYMBOL_GPL(musb_dma_completion); 1828 1829 #else 1830 #define use_dma 0 1831 #endif 1832 1833 static int (*musb_phy_callback)(enum musb_vbus_id_status status); 1834 1835 /* 1836 * musb_mailbox - optional phy notifier function 1837 * @status phy state change 1838 * 1839 * Optionally gets called from the USB PHY. Note that the USB PHY must be 1840 * disabled at the point the phy_callback is registered or unregistered. 1841 */ 1842 int musb_mailbox(enum musb_vbus_id_status status) 1843 { 1844 if (musb_phy_callback) 1845 return musb_phy_callback(status); 1846 1847 return -ENODEV; 1848 }; 1849 EXPORT_SYMBOL_GPL(musb_mailbox); 1850 1851 /*-------------------------------------------------------------------------*/ 1852 1853 static ssize_t 1854 mode_show(struct device *dev, struct device_attribute *attr, char *buf) 1855 { 1856 struct musb *musb = dev_to_musb(dev); 1857 unsigned long flags; 1858 int ret; 1859 1860 spin_lock_irqsave(&musb->lock, flags); 1861 ret = sprintf(buf, "%s\n", musb_otg_state_string(musb)); 1862 spin_unlock_irqrestore(&musb->lock, flags); 1863 1864 return ret; 1865 } 1866 1867 static ssize_t 1868 mode_store(struct device *dev, struct device_attribute *attr, 1869 const char *buf, size_t n) 1870 { 1871 struct musb *musb = dev_to_musb(dev); 1872 unsigned long flags; 1873 int status; 1874 1875 spin_lock_irqsave(&musb->lock, flags); 1876 if (sysfs_streq(buf, "host")) 1877 status = musb_platform_set_mode(musb, MUSB_HOST); 1878 else if (sysfs_streq(buf, "peripheral")) 1879 status = musb_platform_set_mode(musb, MUSB_PERIPHERAL); 1880 else if (sysfs_streq(buf, "otg")) 1881 status = musb_platform_set_mode(musb, MUSB_OTG); 1882 else 1883 status = -EINVAL; 1884 spin_unlock_irqrestore(&musb->lock, flags); 1885 1886 return (status == 0) ? n : status; 1887 } 1888 static DEVICE_ATTR_RW(mode); 1889 1890 static ssize_t 1891 vbus_store(struct device *dev, struct device_attribute *attr, 1892 const char *buf, size_t n) 1893 { 1894 struct musb *musb = dev_to_musb(dev); 1895 unsigned long flags; 1896 unsigned long val; 1897 1898 if (sscanf(buf, "%lu", &val) < 1) { 1899 dev_err(dev, "Invalid VBUS timeout ms value\n"); 1900 return -EINVAL; 1901 } 1902 1903 spin_lock_irqsave(&musb->lock, flags); 1904 /* force T(a_wait_bcon) to be zero/unlimited *OR* valid */ 1905 musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ; 1906 if (musb_get_state(musb) == OTG_STATE_A_WAIT_BCON) 1907 musb->is_active = 0; 1908 musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val)); 1909 spin_unlock_irqrestore(&musb->lock, flags); 1910 1911 return n; 1912 } 1913 1914 static ssize_t 1915 vbus_show(struct device *dev, struct device_attribute *attr, char *buf) 1916 { 1917 struct musb *musb = dev_to_musb(dev); 1918 unsigned long flags; 1919 unsigned long val; 1920 int vbus; 1921 u8 devctl; 1922 1923 pm_runtime_get_sync(dev); 1924 spin_lock_irqsave(&musb->lock, flags); 1925 val = musb->a_wait_bcon; 1926 vbus = musb_platform_get_vbus_status(musb); 1927 if (vbus < 0) { 1928 /* Use default MUSB method by means of DEVCTL register */ 1929 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 1930 if ((devctl & MUSB_DEVCTL_VBUS) 1931 == (3 << MUSB_DEVCTL_VBUS_SHIFT)) 1932 vbus = 1; 1933 else 1934 vbus = 0; 1935 } 1936 spin_unlock_irqrestore(&musb->lock, flags); 1937 pm_runtime_put_sync(dev); 1938 1939 return sprintf(buf, "Vbus %s, timeout %lu msec\n", 1940 vbus ? "on" : "off", val); 1941 } 1942 static DEVICE_ATTR_RW(vbus); 1943 1944 /* Gadget drivers can't know that a host is connected so they might want 1945 * to start SRP, but users can. This allows userspace to trigger SRP. 1946 */ 1947 static ssize_t srp_store(struct device *dev, struct device_attribute *attr, 1948 const char *buf, size_t n) 1949 { 1950 struct musb *musb = dev_to_musb(dev); 1951 unsigned short srp; 1952 1953 if (sscanf(buf, "%hu", &srp) != 1 1954 || (srp != 1)) { 1955 dev_err(dev, "SRP: Value must be 1\n"); 1956 return -EINVAL; 1957 } 1958 1959 if (srp == 1) 1960 musb_g_wakeup(musb); 1961 1962 return n; 1963 } 1964 static DEVICE_ATTR_WO(srp); 1965 1966 static struct attribute *musb_attrs[] = { 1967 &dev_attr_mode.attr, 1968 &dev_attr_vbus.attr, 1969 &dev_attr_srp.attr, 1970 NULL 1971 }; 1972 ATTRIBUTE_GROUPS(musb); 1973 1974 #define MUSB_QUIRK_B_INVALID_VBUS_91 (MUSB_DEVCTL_BDEVICE | \ 1975 (2 << MUSB_DEVCTL_VBUS_SHIFT) | \ 1976 MUSB_DEVCTL_SESSION) 1977 #define MUSB_QUIRK_B_DISCONNECT_99 (MUSB_DEVCTL_BDEVICE | \ 1978 (3 << MUSB_DEVCTL_VBUS_SHIFT) | \ 1979 MUSB_DEVCTL_SESSION) 1980 #define MUSB_QUIRK_A_DISCONNECT_19 ((3 << MUSB_DEVCTL_VBUS_SHIFT) | \ 1981 MUSB_DEVCTL_SESSION) 1982 1983 static bool musb_state_needs_recheck(struct musb *musb, u8 devctl, 1984 const char *desc) 1985 { 1986 if (musb->quirk_retries && !musb->flush_irq_work) { 1987 trace_musb_state(musb, devctl, desc); 1988 schedule_delayed_work(&musb->irq_work, 1989 msecs_to_jiffies(1000)); 1990 musb->quirk_retries--; 1991 1992 return true; 1993 } 1994 1995 return false; 1996 } 1997 1998 /* 1999 * Check the musb devctl session bit to determine if we want to 2000 * allow PM runtime for the device. In general, we want to keep things 2001 * active when the session bit is set except after host disconnect. 2002 * 2003 * Only called from musb_irq_work. If this ever needs to get called 2004 * elsewhere, proper locking must be implemented for musb->session. 2005 */ 2006 static void musb_pm_runtime_check_session(struct musb *musb) 2007 { 2008 u8 devctl, s; 2009 int error; 2010 2011 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 2012 2013 /* Handle session status quirks first */ 2014 s = MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV | 2015 MUSB_DEVCTL_HR; 2016 switch (devctl & ~s) { 2017 case MUSB_QUIRK_B_DISCONNECT_99: 2018 musb_state_needs_recheck(musb, devctl, 2019 "Poll devctl in case of suspend after disconnect"); 2020 break; 2021 case MUSB_QUIRK_B_INVALID_VBUS_91: 2022 if (musb_state_needs_recheck(musb, devctl, 2023 "Poll devctl on invalid vbus, assume no session")) 2024 return; 2025 fallthrough; 2026 case MUSB_QUIRK_A_DISCONNECT_19: 2027 if (musb_state_needs_recheck(musb, devctl, 2028 "Poll devctl on possible host mode disconnect")) 2029 return; 2030 if (!musb->session) 2031 break; 2032 trace_musb_state(musb, devctl, "Allow PM on possible host mode disconnect"); 2033 pm_runtime_mark_last_busy(musb->controller); 2034 pm_runtime_put_autosuspend(musb->controller); 2035 musb->session = false; 2036 return; 2037 default: 2038 break; 2039 } 2040 2041 /* No need to do anything if session has not changed */ 2042 s = devctl & MUSB_DEVCTL_SESSION; 2043 if (s == musb->session) 2044 return; 2045 2046 /* Block PM or allow PM? */ 2047 if (s) { 2048 trace_musb_state(musb, devctl, "Block PM on active session"); 2049 error = pm_runtime_get_sync(musb->controller); 2050 if (error < 0) 2051 dev_err(musb->controller, "Could not enable: %i\n", 2052 error); 2053 musb->quirk_retries = 3; 2054 2055 /* 2056 * We can get a spurious MUSB_INTR_SESSREQ interrupt on start-up 2057 * in B-peripheral mode with nothing connected and the session 2058 * bit clears silently. Check status again in 3 seconds. 2059 */ 2060 if (devctl & MUSB_DEVCTL_BDEVICE) 2061 schedule_delayed_work(&musb->irq_work, 2062 msecs_to_jiffies(3000)); 2063 } else { 2064 trace_musb_state(musb, devctl, "Allow PM with no session"); 2065 pm_runtime_mark_last_busy(musb->controller); 2066 pm_runtime_put_autosuspend(musb->controller); 2067 } 2068 2069 musb->session = s; 2070 } 2071 2072 /* Only used to provide driver mode change events */ 2073 static void musb_irq_work(struct work_struct *data) 2074 { 2075 struct musb *musb = container_of(data, struct musb, irq_work.work); 2076 int error; 2077 2078 error = pm_runtime_resume_and_get(musb->controller); 2079 if (error < 0) { 2080 dev_err(musb->controller, "Could not enable: %i\n", error); 2081 2082 return; 2083 } 2084 2085 musb_pm_runtime_check_session(musb); 2086 2087 if (musb_get_state(musb) != musb->xceiv_old_state) { 2088 musb->xceiv_old_state = musb_get_state(musb); 2089 sysfs_notify(&musb->controller->kobj, NULL, "mode"); 2090 } 2091 2092 pm_runtime_mark_last_busy(musb->controller); 2093 pm_runtime_put_autosuspend(musb->controller); 2094 } 2095 2096 static void musb_recover_from_babble(struct musb *musb) 2097 { 2098 int ret; 2099 u8 devctl; 2100 2101 musb_disable_interrupts(musb); 2102 2103 /* 2104 * wait at least 320 cycles of 60MHz clock. That's 5.3us, we will give 2105 * it some slack and wait for 10us. 2106 */ 2107 udelay(10); 2108 2109 ret = musb_platform_recover(musb); 2110 if (ret) { 2111 musb_enable_interrupts(musb); 2112 return; 2113 } 2114 2115 /* drop session bit */ 2116 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 2117 devctl &= ~MUSB_DEVCTL_SESSION; 2118 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 2119 2120 /* tell usbcore about it */ 2121 musb_root_disconnect(musb); 2122 2123 /* 2124 * When a babble condition occurs, the musb controller 2125 * removes the session bit and the endpoint config is lost. 2126 */ 2127 if (musb->dyn_fifo) 2128 ret = ep_config_from_table(musb); 2129 else 2130 ret = ep_config_from_hw(musb); 2131 2132 /* restart session */ 2133 if (ret == 0) 2134 musb_start(musb); 2135 } 2136 2137 /* -------------------------------------------------------------------------- 2138 * Init support 2139 */ 2140 2141 static struct musb *allocate_instance(struct device *dev, 2142 const struct musb_hdrc_config *config, void __iomem *mbase) 2143 { 2144 struct musb *musb; 2145 struct musb_hw_ep *ep; 2146 int epnum; 2147 int ret; 2148 2149 musb = devm_kzalloc(dev, sizeof(*musb), GFP_KERNEL); 2150 if (!musb) 2151 return NULL; 2152 2153 INIT_LIST_HEAD(&musb->control); 2154 INIT_LIST_HEAD(&musb->in_bulk); 2155 INIT_LIST_HEAD(&musb->out_bulk); 2156 INIT_LIST_HEAD(&musb->pending_list); 2157 2158 musb->vbuserr_retry = VBUSERR_RETRY_COUNT; 2159 musb->a_wait_bcon = OTG_TIME_A_WAIT_BCON; 2160 musb->mregs = mbase; 2161 musb->ctrl_base = mbase; 2162 musb->nIrq = -ENODEV; 2163 musb->config = config; 2164 BUG_ON(musb->config->num_eps > MUSB_C_NUM_EPS); 2165 for (epnum = 0, ep = musb->endpoints; 2166 epnum < musb->config->num_eps; 2167 epnum++, ep++) { 2168 ep->musb = musb; 2169 ep->epnum = epnum; 2170 } 2171 2172 musb->controller = dev; 2173 2174 ret = musb_host_alloc(musb); 2175 if (ret < 0) 2176 goto err_free; 2177 2178 dev_set_drvdata(dev, musb); 2179 2180 return musb; 2181 2182 err_free: 2183 return NULL; 2184 } 2185 2186 static void musb_free(struct musb *musb) 2187 { 2188 /* this has multiple entry modes. it handles fault cleanup after 2189 * probe(), where things may be partially set up, as well as rmmod 2190 * cleanup after everything's been de-activated. 2191 */ 2192 2193 if (musb->nIrq >= 0) { 2194 if (musb->irq_wake) 2195 disable_irq_wake(musb->nIrq); 2196 free_irq(musb->nIrq, musb); 2197 } 2198 2199 musb_host_free(musb); 2200 } 2201 2202 struct musb_pending_work { 2203 int (*callback)(struct musb *musb, void *data); 2204 void *data; 2205 struct list_head node; 2206 }; 2207 2208 #ifdef CONFIG_PM 2209 /* 2210 * Called from musb_runtime_resume(), musb_resume(), and 2211 * musb_queue_resume_work(). Callers must take musb->lock. 2212 */ 2213 static int musb_run_resume_work(struct musb *musb) 2214 { 2215 struct musb_pending_work *w, *_w; 2216 unsigned long flags; 2217 int error = 0; 2218 2219 spin_lock_irqsave(&musb->list_lock, flags); 2220 list_for_each_entry_safe(w, _w, &musb->pending_list, node) { 2221 if (w->callback) { 2222 error = w->callback(musb, w->data); 2223 if (error < 0) { 2224 dev_err(musb->controller, 2225 "resume callback %p failed: %i\n", 2226 w->callback, error); 2227 } 2228 } 2229 list_del(&w->node); 2230 devm_kfree(musb->controller, w); 2231 } 2232 spin_unlock_irqrestore(&musb->list_lock, flags); 2233 2234 return error; 2235 } 2236 #endif 2237 2238 /* 2239 * Called to run work if device is active or else queue the work to happen 2240 * on resume. Caller must take musb->lock and must hold an RPM reference. 2241 * 2242 * Note that we cowardly refuse queuing work after musb PM runtime 2243 * resume is done calling musb_run_resume_work() and return -EINPROGRESS 2244 * instead. 2245 */ 2246 int musb_queue_resume_work(struct musb *musb, 2247 int (*callback)(struct musb *musb, void *data), 2248 void *data) 2249 { 2250 struct musb_pending_work *w; 2251 unsigned long flags; 2252 bool is_suspended; 2253 int error; 2254 2255 if (WARN_ON(!callback)) 2256 return -EINVAL; 2257 2258 spin_lock_irqsave(&musb->list_lock, flags); 2259 is_suspended = musb->is_runtime_suspended; 2260 2261 if (is_suspended) { 2262 w = devm_kzalloc(musb->controller, sizeof(*w), GFP_ATOMIC); 2263 if (!w) { 2264 error = -ENOMEM; 2265 goto out_unlock; 2266 } 2267 2268 w->callback = callback; 2269 w->data = data; 2270 2271 list_add_tail(&w->node, &musb->pending_list); 2272 error = 0; 2273 } 2274 2275 out_unlock: 2276 spin_unlock_irqrestore(&musb->list_lock, flags); 2277 2278 if (!is_suspended) 2279 error = callback(musb, data); 2280 2281 return error; 2282 } 2283 EXPORT_SYMBOL_GPL(musb_queue_resume_work); 2284 2285 static void musb_deassert_reset(struct work_struct *work) 2286 { 2287 struct musb *musb; 2288 unsigned long flags; 2289 2290 musb = container_of(work, struct musb, deassert_reset_work.work); 2291 2292 spin_lock_irqsave(&musb->lock, flags); 2293 2294 if (musb->port1_status & USB_PORT_STAT_RESET) 2295 musb_port_reset(musb, false); 2296 2297 spin_unlock_irqrestore(&musb->lock, flags); 2298 } 2299 2300 /* 2301 * Perform generic per-controller initialization. 2302 * 2303 * @dev: the controller (already clocked, etc) 2304 * @nIrq: IRQ number 2305 * @ctrl: virtual address of controller registers, 2306 * not yet corrected for platform-specific offsets 2307 */ 2308 static int 2309 musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl) 2310 { 2311 int status; 2312 struct musb *musb; 2313 struct musb_hdrc_platform_data *plat = dev_get_platdata(dev); 2314 2315 /* The driver might handle more features than the board; OK. 2316 * Fail when the board needs a feature that's not enabled. 2317 */ 2318 if (!plat) { 2319 dev_err(dev, "no platform_data?\n"); 2320 status = -ENODEV; 2321 goto fail0; 2322 } 2323 2324 /* allocate */ 2325 musb = allocate_instance(dev, plat->config, ctrl); 2326 if (!musb) { 2327 status = -ENOMEM; 2328 goto fail0; 2329 } 2330 2331 spin_lock_init(&musb->lock); 2332 spin_lock_init(&musb->list_lock); 2333 musb->min_power = plat->min_power; 2334 musb->ops = plat->platform_ops; 2335 musb->port_mode = plat->mode; 2336 2337 /* 2338 * Initialize the default IO functions. At least omap2430 needs 2339 * these early. We initialize the platform specific IO functions 2340 * later on. 2341 */ 2342 musb_readb = musb_default_readb; 2343 musb_writeb = musb_default_writeb; 2344 musb_readw = musb_default_readw; 2345 musb_writew = musb_default_writew; 2346 2347 /* The musb_platform_init() call: 2348 * - adjusts musb->mregs 2349 * - sets the musb->isr 2350 * - may initialize an integrated transceiver 2351 * - initializes musb->xceiv, usually by otg_get_phy() 2352 * - stops powering VBUS 2353 * 2354 * There are various transceiver configurations. 2355 * DaVinci, TUSB60x0, and others integrate them. OMAP3 uses 2356 * external/discrete ones in various flavors (twl4030 family, 2357 * isp1504, non-OTG, etc) mostly hooking up through ULPI. 2358 */ 2359 status = musb_platform_init(musb); 2360 if (status < 0) 2361 goto fail1; 2362 2363 if (!musb->isr) { 2364 status = -ENODEV; 2365 goto fail2; 2366 } 2367 2368 2369 /* Most devices use indexed offset or flat offset */ 2370 if (musb->ops->quirks & MUSB_INDEXED_EP) { 2371 musb->io.ep_offset = musb_indexed_ep_offset; 2372 musb->io.ep_select = musb_indexed_ep_select; 2373 } else { 2374 musb->io.ep_offset = musb_flat_ep_offset; 2375 musb->io.ep_select = musb_flat_ep_select; 2376 } 2377 2378 if (musb->ops->quirks & MUSB_G_NO_SKB_RESERVE) 2379 musb->g.quirk_avoids_skb_reserve = 1; 2380 2381 /* At least tusb6010 has its own offsets */ 2382 if (musb->ops->ep_offset) 2383 musb->io.ep_offset = musb->ops->ep_offset; 2384 if (musb->ops->ep_select) 2385 musb->io.ep_select = musb->ops->ep_select; 2386 2387 if (musb->ops->fifo_mode) 2388 fifo_mode = musb->ops->fifo_mode; 2389 else 2390 fifo_mode = 4; 2391 2392 if (musb->ops->fifo_offset) 2393 musb->io.fifo_offset = musb->ops->fifo_offset; 2394 else 2395 musb->io.fifo_offset = musb_default_fifo_offset; 2396 2397 if (musb->ops->busctl_offset) 2398 musb->io.busctl_offset = musb->ops->busctl_offset; 2399 else 2400 musb->io.busctl_offset = musb_default_busctl_offset; 2401 2402 if (musb->ops->readb) 2403 musb_readb = musb->ops->readb; 2404 if (musb->ops->writeb) 2405 musb_writeb = musb->ops->writeb; 2406 if (musb->ops->clearb) 2407 musb_clearb = musb->ops->clearb; 2408 else 2409 musb_clearb = musb_readb; 2410 2411 if (musb->ops->readw) 2412 musb_readw = musb->ops->readw; 2413 if (musb->ops->writew) 2414 musb_writew = musb->ops->writew; 2415 if (musb->ops->clearw) 2416 musb_clearw = musb->ops->clearw; 2417 else 2418 musb_clearw = musb_readw; 2419 2420 #ifndef CONFIG_MUSB_PIO_ONLY 2421 if (!musb->ops->dma_init || !musb->ops->dma_exit) { 2422 dev_err(dev, "DMA controller not set\n"); 2423 status = -ENODEV; 2424 goto fail2; 2425 } 2426 musb_dma_controller_create = musb->ops->dma_init; 2427 musb_dma_controller_destroy = musb->ops->dma_exit; 2428 #endif 2429 2430 if (musb->ops->read_fifo) 2431 musb->io.read_fifo = musb->ops->read_fifo; 2432 else 2433 musb->io.read_fifo = musb_default_read_fifo; 2434 2435 if (musb->ops->write_fifo) 2436 musb->io.write_fifo = musb->ops->write_fifo; 2437 else 2438 musb->io.write_fifo = musb_default_write_fifo; 2439 2440 if (musb->ops->get_toggle) 2441 musb->io.get_toggle = musb->ops->get_toggle; 2442 else 2443 musb->io.get_toggle = musb_default_get_toggle; 2444 2445 if (musb->ops->set_toggle) 2446 musb->io.set_toggle = musb->ops->set_toggle; 2447 else 2448 musb->io.set_toggle = musb_default_set_toggle; 2449 2450 if (IS_ENABLED(CONFIG_USB_PHY) && musb->xceiv && !musb->xceiv->io_ops) { 2451 musb->xceiv->io_dev = musb->controller; 2452 musb->xceiv->io_priv = musb->mregs; 2453 musb->xceiv->io_ops = &musb_ulpi_access; 2454 } 2455 2456 if (musb->ops->phy_callback) 2457 musb_phy_callback = musb->ops->phy_callback; 2458 2459 /* 2460 * We need musb_read/write functions initialized for PM. 2461 * Note that at least 2430 glue needs autosuspend delay 2462 * somewhere above 300 ms for the hardware to idle properly 2463 * after disconnecting the cable in host mode. Let's use 2464 * 500 ms for some margin. 2465 */ 2466 pm_runtime_use_autosuspend(musb->controller); 2467 pm_runtime_set_autosuspend_delay(musb->controller, 500); 2468 pm_runtime_enable(musb->controller); 2469 pm_runtime_get_sync(musb->controller); 2470 2471 status = usb_phy_init(musb->xceiv); 2472 if (status < 0) 2473 goto err_usb_phy_init; 2474 2475 if (use_dma && dev->dma_mask) { 2476 musb->dma_controller = 2477 musb_dma_controller_create(musb, musb->mregs); 2478 if (IS_ERR(musb->dma_controller)) { 2479 status = PTR_ERR(musb->dma_controller); 2480 goto fail2_5; 2481 } 2482 } 2483 2484 /* be sure interrupts are disabled before connecting ISR */ 2485 musb_platform_disable(musb); 2486 musb_disable_interrupts(musb); 2487 musb_writeb(musb->mregs, MUSB_DEVCTL, 0); 2488 2489 /* MUSB_POWER_SOFTCONN might be already set, JZ4740 does this. */ 2490 musb_writeb(musb->mregs, MUSB_POWER, 0); 2491 2492 /* Init IRQ workqueue before request_irq */ 2493 INIT_DELAYED_WORK(&musb->irq_work, musb_irq_work); 2494 INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset); 2495 INIT_DELAYED_WORK(&musb->finish_resume_work, musb_host_finish_resume); 2496 2497 /* setup musb parts of the core (especially endpoints) */ 2498 status = musb_core_init(plat->config->multipoint 2499 ? MUSB_CONTROLLER_MHDRC 2500 : MUSB_CONTROLLER_HDRC, musb); 2501 if (status < 0) 2502 goto fail3; 2503 2504 timer_setup(&musb->otg_timer, musb_otg_timer_func, 0); 2505 2506 /* attach to the IRQ */ 2507 if (request_irq(nIrq, musb->isr, IRQF_SHARED, dev_name(dev), musb)) { 2508 dev_err(dev, "request_irq %d failed!\n", nIrq); 2509 status = -ENODEV; 2510 goto fail3; 2511 } 2512 musb->nIrq = nIrq; 2513 /* FIXME this handles wakeup irqs wrong */ 2514 if (enable_irq_wake(nIrq) == 0) { 2515 musb->irq_wake = 1; 2516 device_init_wakeup(dev, 1); 2517 } else { 2518 musb->irq_wake = 0; 2519 } 2520 2521 /* program PHY to use external vBus if required */ 2522 if (plat->extvbus) { 2523 u8 busctl = musb_readb(musb->mregs, MUSB_ULPI_BUSCONTROL); 2524 busctl |= MUSB_ULPI_USE_EXTVBUS; 2525 musb_writeb(musb->mregs, MUSB_ULPI_BUSCONTROL, busctl); 2526 } 2527 2528 MUSB_DEV_MODE(musb); 2529 musb_set_state(musb, OTG_STATE_B_IDLE); 2530 2531 switch (musb->port_mode) { 2532 case MUSB_HOST: 2533 status = musb_host_setup(musb, plat->power); 2534 if (status < 0) 2535 goto fail3; 2536 status = musb_platform_set_mode(musb, MUSB_HOST); 2537 break; 2538 case MUSB_PERIPHERAL: 2539 status = musb_gadget_setup(musb); 2540 if (status < 0) 2541 goto fail3; 2542 status = musb_platform_set_mode(musb, MUSB_PERIPHERAL); 2543 break; 2544 case MUSB_OTG: 2545 status = musb_host_setup(musb, plat->power); 2546 if (status < 0) 2547 goto fail3; 2548 status = musb_gadget_setup(musb); 2549 if (status) { 2550 musb_host_cleanup(musb); 2551 goto fail3; 2552 } 2553 status = musb_platform_set_mode(musb, MUSB_OTG); 2554 break; 2555 default: 2556 dev_err(dev, "unsupported port mode %d\n", musb->port_mode); 2557 break; 2558 } 2559 2560 if (status < 0) 2561 goto fail3; 2562 2563 musb_init_debugfs(musb); 2564 2565 musb->is_initialized = 1; 2566 pm_runtime_mark_last_busy(musb->controller); 2567 pm_runtime_put_autosuspend(musb->controller); 2568 2569 return 0; 2570 2571 fail3: 2572 cancel_delayed_work_sync(&musb->irq_work); 2573 cancel_delayed_work_sync(&musb->finish_resume_work); 2574 cancel_delayed_work_sync(&musb->deassert_reset_work); 2575 if (musb->dma_controller) 2576 musb_dma_controller_destroy(musb->dma_controller); 2577 2578 fail2_5: 2579 usb_phy_shutdown(musb->xceiv); 2580 2581 err_usb_phy_init: 2582 pm_runtime_dont_use_autosuspend(musb->controller); 2583 pm_runtime_put_sync(musb->controller); 2584 pm_runtime_disable(musb->controller); 2585 2586 fail2: 2587 if (musb->irq_wake) 2588 device_init_wakeup(dev, 0); 2589 musb_platform_exit(musb); 2590 2591 fail1: 2592 dev_err_probe(musb->controller, status, "%s failed\n", __func__); 2593 2594 musb_free(musb); 2595 2596 fail0: 2597 2598 return status; 2599 2600 } 2601 2602 /*-------------------------------------------------------------------------*/ 2603 2604 /* all implementations (PCI bridge to FPGA, VLYNQ, etc) should just 2605 * bridge to a platform device; this driver then suffices. 2606 */ 2607 static int musb_probe(struct platform_device *pdev) 2608 { 2609 struct device *dev = &pdev->dev; 2610 int irq = platform_get_irq_byname(pdev, "mc"); 2611 void __iomem *base; 2612 2613 if (irq < 0) 2614 return irq; 2615 2616 base = devm_platform_ioremap_resource(pdev, 0); 2617 if (IS_ERR(base)) 2618 return PTR_ERR(base); 2619 2620 return musb_init_controller(dev, irq, base); 2621 } 2622 2623 static void musb_remove(struct platform_device *pdev) 2624 { 2625 struct device *dev = &pdev->dev; 2626 struct musb *musb = dev_to_musb(dev); 2627 unsigned long flags; 2628 2629 /* this gets called on rmmod. 2630 * - Host mode: host may still be active 2631 * - Peripheral mode: peripheral is deactivated (or never-activated) 2632 * - OTG mode: both roles are deactivated (or never-activated) 2633 */ 2634 musb_exit_debugfs(musb); 2635 2636 cancel_delayed_work_sync(&musb->irq_work); 2637 cancel_delayed_work_sync(&musb->finish_resume_work); 2638 cancel_delayed_work_sync(&musb->deassert_reset_work); 2639 pm_runtime_get_sync(musb->controller); 2640 musb_host_cleanup(musb); 2641 musb_gadget_cleanup(musb); 2642 2643 musb_platform_disable(musb); 2644 spin_lock_irqsave(&musb->lock, flags); 2645 musb_disable_interrupts(musb); 2646 musb_writeb(musb->mregs, MUSB_DEVCTL, 0); 2647 spin_unlock_irqrestore(&musb->lock, flags); 2648 musb_platform_exit(musb); 2649 2650 pm_runtime_dont_use_autosuspend(musb->controller); 2651 pm_runtime_put_sync(musb->controller); 2652 pm_runtime_disable(musb->controller); 2653 musb_phy_callback = NULL; 2654 if (musb->dma_controller) 2655 musb_dma_controller_destroy(musb->dma_controller); 2656 usb_phy_shutdown(musb->xceiv); 2657 musb_free(musb); 2658 device_init_wakeup(dev, 0); 2659 } 2660 2661 #ifdef CONFIG_PM 2662 2663 static void musb_save_context(struct musb *musb) 2664 { 2665 int i; 2666 void __iomem *musb_base = musb->mregs; 2667 void __iomem *epio; 2668 2669 musb->context.frame = musb_readw(musb_base, MUSB_FRAME); 2670 musb->context.testmode = musb_readb(musb_base, MUSB_TESTMODE); 2671 musb->context.busctl = musb_readb(musb_base, MUSB_ULPI_BUSCONTROL); 2672 musb->context.power = musb_readb(musb_base, MUSB_POWER); 2673 musb->context.intrusbe = musb_readb(musb_base, MUSB_INTRUSBE); 2674 musb->context.index = musb_readb(musb_base, MUSB_INDEX); 2675 musb->context.devctl = musb_readb(musb_base, MUSB_DEVCTL); 2676 2677 for (i = 0; i < musb->config->num_eps; ++i) { 2678 epio = musb->endpoints[i].regs; 2679 if (!epio) 2680 continue; 2681 2682 musb_writeb(musb_base, MUSB_INDEX, i); 2683 musb->context.index_regs[i].txmaxp = 2684 musb_readw(epio, MUSB_TXMAXP); 2685 musb->context.index_regs[i].txcsr = 2686 musb_readw(epio, MUSB_TXCSR); 2687 musb->context.index_regs[i].rxmaxp = 2688 musb_readw(epio, MUSB_RXMAXP); 2689 musb->context.index_regs[i].rxcsr = 2690 musb_readw(epio, MUSB_RXCSR); 2691 2692 if (musb->dyn_fifo) { 2693 musb->context.index_regs[i].txfifoadd = 2694 musb_readw(musb_base, MUSB_TXFIFOADD); 2695 musb->context.index_regs[i].rxfifoadd = 2696 musb_readw(musb_base, MUSB_RXFIFOADD); 2697 musb->context.index_regs[i].txfifosz = 2698 musb_readb(musb_base, MUSB_TXFIFOSZ); 2699 musb->context.index_regs[i].rxfifosz = 2700 musb_readb(musb_base, MUSB_RXFIFOSZ); 2701 } 2702 2703 musb->context.index_regs[i].txtype = 2704 musb_readb(epio, MUSB_TXTYPE); 2705 musb->context.index_regs[i].txinterval = 2706 musb_readb(epio, MUSB_TXINTERVAL); 2707 musb->context.index_regs[i].rxtype = 2708 musb_readb(epio, MUSB_RXTYPE); 2709 musb->context.index_regs[i].rxinterval = 2710 musb_readb(epio, MUSB_RXINTERVAL); 2711 2712 musb->context.index_regs[i].txfunaddr = 2713 musb_read_txfunaddr(musb, i); 2714 musb->context.index_regs[i].txhubaddr = 2715 musb_read_txhubaddr(musb, i); 2716 musb->context.index_regs[i].txhubport = 2717 musb_read_txhubport(musb, i); 2718 2719 musb->context.index_regs[i].rxfunaddr = 2720 musb_read_rxfunaddr(musb, i); 2721 musb->context.index_regs[i].rxhubaddr = 2722 musb_read_rxhubaddr(musb, i); 2723 musb->context.index_regs[i].rxhubport = 2724 musb_read_rxhubport(musb, i); 2725 } 2726 } 2727 2728 static void musb_restore_context(struct musb *musb) 2729 { 2730 int i; 2731 void __iomem *musb_base = musb->mregs; 2732 void __iomem *epio; 2733 u8 power; 2734 2735 musb_writew(musb_base, MUSB_FRAME, musb->context.frame); 2736 musb_writeb(musb_base, MUSB_TESTMODE, musb->context.testmode); 2737 musb_writeb(musb_base, MUSB_ULPI_BUSCONTROL, musb->context.busctl); 2738 2739 /* Don't affect SUSPENDM/RESUME bits in POWER reg */ 2740 power = musb_readb(musb_base, MUSB_POWER); 2741 power &= MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME; 2742 musb->context.power &= ~(MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME); 2743 power |= musb->context.power; 2744 musb_writeb(musb_base, MUSB_POWER, power); 2745 2746 musb_writew(musb_base, MUSB_INTRTXE, musb->intrtxe); 2747 musb_writew(musb_base, MUSB_INTRRXE, musb->intrrxe); 2748 musb_writeb(musb_base, MUSB_INTRUSBE, musb->context.intrusbe); 2749 if (musb->context.devctl & MUSB_DEVCTL_SESSION) 2750 musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl); 2751 2752 for (i = 0; i < musb->config->num_eps; ++i) { 2753 epio = musb->endpoints[i].regs; 2754 if (!epio) 2755 continue; 2756 2757 musb_writeb(musb_base, MUSB_INDEX, i); 2758 musb_writew(epio, MUSB_TXMAXP, 2759 musb->context.index_regs[i].txmaxp); 2760 musb_writew(epio, MUSB_TXCSR, 2761 musb->context.index_regs[i].txcsr); 2762 musb_writew(epio, MUSB_RXMAXP, 2763 musb->context.index_regs[i].rxmaxp); 2764 musb_writew(epio, MUSB_RXCSR, 2765 musb->context.index_regs[i].rxcsr); 2766 2767 if (musb->dyn_fifo) { 2768 musb_writeb(musb_base, MUSB_TXFIFOSZ, 2769 musb->context.index_regs[i].txfifosz); 2770 musb_writeb(musb_base, MUSB_RXFIFOSZ, 2771 musb->context.index_regs[i].rxfifosz); 2772 musb_writew(musb_base, MUSB_TXFIFOADD, 2773 musb->context.index_regs[i].txfifoadd); 2774 musb_writew(musb_base, MUSB_RXFIFOADD, 2775 musb->context.index_regs[i].rxfifoadd); 2776 } 2777 2778 musb_writeb(epio, MUSB_TXTYPE, 2779 musb->context.index_regs[i].txtype); 2780 musb_writeb(epio, MUSB_TXINTERVAL, 2781 musb->context.index_regs[i].txinterval); 2782 musb_writeb(epio, MUSB_RXTYPE, 2783 musb->context.index_regs[i].rxtype); 2784 musb_writeb(epio, MUSB_RXINTERVAL, 2785 2786 musb->context.index_regs[i].rxinterval); 2787 musb_write_txfunaddr(musb, i, 2788 musb->context.index_regs[i].txfunaddr); 2789 musb_write_txhubaddr(musb, i, 2790 musb->context.index_regs[i].txhubaddr); 2791 musb_write_txhubport(musb, i, 2792 musb->context.index_regs[i].txhubport); 2793 2794 musb_write_rxfunaddr(musb, i, 2795 musb->context.index_regs[i].rxfunaddr); 2796 musb_write_rxhubaddr(musb, i, 2797 musb->context.index_regs[i].rxhubaddr); 2798 musb_write_rxhubport(musb, i, 2799 musb->context.index_regs[i].rxhubport); 2800 } 2801 musb_writeb(musb_base, MUSB_INDEX, musb->context.index); 2802 } 2803 2804 static int musb_suspend(struct device *dev) 2805 { 2806 struct musb *musb = dev_to_musb(dev); 2807 unsigned long flags; 2808 int ret; 2809 2810 ret = pm_runtime_get_sync(dev); 2811 if (ret < 0) { 2812 pm_runtime_put_noidle(dev); 2813 return ret; 2814 } 2815 2816 musb_platform_disable(musb); 2817 musb_disable_interrupts(musb); 2818 2819 musb->flush_irq_work = true; 2820 while (flush_delayed_work(&musb->irq_work)) 2821 ; 2822 musb->flush_irq_work = false; 2823 2824 if (!(musb->ops->quirks & MUSB_PRESERVE_SESSION)) 2825 musb_writeb(musb->mregs, MUSB_DEVCTL, 0); 2826 2827 WARN_ON(!list_empty(&musb->pending_list)); 2828 2829 spin_lock_irqsave(&musb->lock, flags); 2830 2831 if (is_peripheral_active(musb)) { 2832 /* FIXME force disconnect unless we know USB will wake 2833 * the system up quickly enough to respond ... 2834 */ 2835 } else if (is_host_active(musb)) { 2836 /* we know all the children are suspended; sometimes 2837 * they will even be wakeup-enabled. 2838 */ 2839 } 2840 2841 musb_save_context(musb); 2842 2843 spin_unlock_irqrestore(&musb->lock, flags); 2844 return 0; 2845 } 2846 2847 static int musb_resume(struct device *dev) 2848 { 2849 struct musb *musb = dev_to_musb(dev); 2850 unsigned long flags; 2851 int error; 2852 u8 devctl; 2853 u8 mask; 2854 2855 /* 2856 * For static cmos like DaVinci, register values were preserved 2857 * unless for some reason the whole soc powered down or the USB 2858 * module got reset through the PSC (vs just being disabled). 2859 * 2860 * For the DSPS glue layer though, a full register restore has to 2861 * be done. As it shouldn't harm other platforms, we do it 2862 * unconditionally. 2863 */ 2864 2865 musb_restore_context(musb); 2866 2867 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 2868 mask = MUSB_DEVCTL_BDEVICE | MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV; 2869 if ((devctl & mask) != (musb->context.devctl & mask)) 2870 musb->port1_status = 0; 2871 2872 musb_enable_interrupts(musb); 2873 musb_platform_enable(musb); 2874 2875 /* session might be disabled in suspend */ 2876 if (musb->port_mode == MUSB_HOST && 2877 !(musb->ops->quirks & MUSB_PRESERVE_SESSION)) { 2878 devctl |= MUSB_DEVCTL_SESSION; 2879 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 2880 } 2881 2882 spin_lock_irqsave(&musb->lock, flags); 2883 error = musb_run_resume_work(musb); 2884 if (error) 2885 dev_err(musb->controller, "resume work failed with %i\n", 2886 error); 2887 spin_unlock_irqrestore(&musb->lock, flags); 2888 2889 pm_runtime_mark_last_busy(dev); 2890 pm_runtime_put_autosuspend(dev); 2891 2892 return 0; 2893 } 2894 2895 static int musb_runtime_suspend(struct device *dev) 2896 { 2897 struct musb *musb = dev_to_musb(dev); 2898 2899 musb_save_context(musb); 2900 musb->is_runtime_suspended = 1; 2901 2902 return 0; 2903 } 2904 2905 static int musb_runtime_resume(struct device *dev) 2906 { 2907 struct musb *musb = dev_to_musb(dev); 2908 unsigned long flags; 2909 int error; 2910 2911 /* 2912 * When pm_runtime_get_sync called for the first time in driver 2913 * init, some of the structure is still not initialized which is 2914 * used in restore function. But clock needs to be 2915 * enabled before any register access, so 2916 * pm_runtime_get_sync has to be called. 2917 * Also context restore without save does not make 2918 * any sense 2919 */ 2920 if (!musb->is_initialized) 2921 return 0; 2922 2923 musb_restore_context(musb); 2924 2925 spin_lock_irqsave(&musb->lock, flags); 2926 error = musb_run_resume_work(musb); 2927 if (error) 2928 dev_err(musb->controller, "resume work failed with %i\n", 2929 error); 2930 musb->is_runtime_suspended = 0; 2931 spin_unlock_irqrestore(&musb->lock, flags); 2932 2933 return 0; 2934 } 2935 2936 static const struct dev_pm_ops musb_dev_pm_ops = { 2937 .suspend = musb_suspend, 2938 .resume = musb_resume, 2939 .runtime_suspend = musb_runtime_suspend, 2940 .runtime_resume = musb_runtime_resume, 2941 }; 2942 2943 #define MUSB_DEV_PM_OPS (&musb_dev_pm_ops) 2944 #else 2945 #define MUSB_DEV_PM_OPS NULL 2946 #endif 2947 2948 static struct platform_driver musb_driver = { 2949 .driver = { 2950 .name = musb_driver_name, 2951 .bus = &platform_bus_type, 2952 .pm = MUSB_DEV_PM_OPS, 2953 .dev_groups = musb_groups, 2954 }, 2955 .probe = musb_probe, 2956 .remove_new = musb_remove, 2957 }; 2958 2959 module_platform_driver(musb_driver); 2960