1 /* 2 * MUSB OTG driver core code 3 * 4 * Copyright 2005 Mentor Graphics Corporation 5 * Copyright (C) 2005-2006 by Texas Instruments 6 * Copyright (C) 2006-2007 Nokia Corporation 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * version 2 as published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 20 * 02110-1301 USA 21 * 22 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 25 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 28 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 29 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 * 33 */ 34 35 /* 36 * Inventra (Multipoint) Dual-Role Controller Driver for Linux. 37 * 38 * This consists of a Host Controller Driver (HCD) and a peripheral 39 * controller driver implementing the "Gadget" API; OTG support is 40 * in the works. These are normal Linux-USB controller drivers which 41 * use IRQs and have no dedicated thread. 42 * 43 * This version of the driver has only been used with products from 44 * Texas Instruments. Those products integrate the Inventra logic 45 * with other DMA, IRQ, and bus modules, as well as other logic that 46 * needs to be reflected in this driver. 47 * 48 * 49 * NOTE: the original Mentor code here was pretty much a collection 50 * of mechanisms that don't seem to have been fully integrated/working 51 * for *any* Linux kernel version. This version aims at Linux 2.6.now, 52 * Key open issues include: 53 * 54 * - Lack of host-side transaction scheduling, for all transfer types. 55 * The hardware doesn't do it; instead, software must. 56 * 57 * This is not an issue for OTG devices that don't support external 58 * hubs, but for more "normal" USB hosts it's a user issue that the 59 * "multipoint" support doesn't scale in the expected ways. That 60 * includes DaVinci EVM in a common non-OTG mode. 61 * 62 * * Control and bulk use dedicated endpoints, and there's as 63 * yet no mechanism to either (a) reclaim the hardware when 64 * peripherals are NAKing, which gets complicated with bulk 65 * endpoints, or (b) use more than a single bulk endpoint in 66 * each direction. 67 * 68 * RESULT: one device may be perceived as blocking another one. 69 * 70 * * Interrupt and isochronous will dynamically allocate endpoint 71 * hardware, but (a) there's no record keeping for bandwidth; 72 * (b) in the common case that few endpoints are available, there 73 * is no mechanism to reuse endpoints to talk to multiple devices. 74 * 75 * RESULT: At one extreme, bandwidth can be overcommitted in 76 * some hardware configurations, no faults will be reported. 77 * At the other extreme, the bandwidth capabilities which do 78 * exist tend to be severely undercommitted. You can't yet hook 79 * up both a keyboard and a mouse to an external USB hub. 80 */ 81 82 /* 83 * This gets many kinds of configuration information: 84 * - Kconfig for everything user-configurable 85 * - platform_device for addressing, irq, and platform_data 86 * - platform_data is mostly for board-specific information 87 * (plus recentrly, SOC or family details) 88 * 89 * Most of the conditional compilation will (someday) vanish. 90 */ 91 92 #include <linux/module.h> 93 #include <linux/kernel.h> 94 #include <linux/sched.h> 95 #include <linux/slab.h> 96 #include <linux/list.h> 97 #include <linux/kobject.h> 98 #include <linux/prefetch.h> 99 #include <linux/platform_device.h> 100 #include <linux/io.h> 101 #include <linux/dma-mapping.h> 102 #include <linux/usb.h> 103 104 #include "musb_core.h" 105 #include "musb_trace.h" 106 107 #define TA_WAIT_BCON(m) max_t(int, (m)->a_wait_bcon, OTG_TIME_A_WAIT_BCON) 108 109 110 #define DRIVER_AUTHOR "Mentor Graphics, Texas Instruments, Nokia" 111 #define DRIVER_DESC "Inventra Dual-Role USB Controller Driver" 112 113 #define MUSB_VERSION "6.0" 114 115 #define DRIVER_INFO DRIVER_DESC ", v" MUSB_VERSION 116 117 #define MUSB_DRIVER_NAME "musb-hdrc" 118 const char musb_driver_name[] = MUSB_DRIVER_NAME; 119 120 MODULE_DESCRIPTION(DRIVER_INFO); 121 MODULE_AUTHOR(DRIVER_AUTHOR); 122 MODULE_LICENSE("GPL"); 123 MODULE_ALIAS("platform:" MUSB_DRIVER_NAME); 124 125 126 /*-------------------------------------------------------------------------*/ 127 128 static inline struct musb *dev_to_musb(struct device *dev) 129 { 130 return dev_get_drvdata(dev); 131 } 132 133 /*-------------------------------------------------------------------------*/ 134 135 #ifndef CONFIG_BLACKFIN 136 static int musb_ulpi_read(struct usb_phy *phy, u32 reg) 137 { 138 void __iomem *addr = phy->io_priv; 139 int i = 0; 140 u8 r; 141 u8 power; 142 int ret; 143 144 pm_runtime_get_sync(phy->io_dev); 145 146 /* Make sure the transceiver is not in low power mode */ 147 power = musb_readb(addr, MUSB_POWER); 148 power &= ~MUSB_POWER_SUSPENDM; 149 musb_writeb(addr, MUSB_POWER, power); 150 151 /* REVISIT: musbhdrc_ulpi_an.pdf recommends setting the 152 * ULPICarKitControlDisableUTMI after clearing POWER_SUSPENDM. 153 */ 154 155 musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg); 156 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, 157 MUSB_ULPI_REG_REQ | MUSB_ULPI_RDN_WR); 158 159 while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL) 160 & MUSB_ULPI_REG_CMPLT)) { 161 i++; 162 if (i == 10000) { 163 ret = -ETIMEDOUT; 164 goto out; 165 } 166 167 } 168 r = musb_readb(addr, MUSB_ULPI_REG_CONTROL); 169 r &= ~MUSB_ULPI_REG_CMPLT; 170 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r); 171 172 ret = musb_readb(addr, MUSB_ULPI_REG_DATA); 173 174 out: 175 pm_runtime_put(phy->io_dev); 176 177 return ret; 178 } 179 180 static int musb_ulpi_write(struct usb_phy *phy, u32 val, u32 reg) 181 { 182 void __iomem *addr = phy->io_priv; 183 int i = 0; 184 u8 r = 0; 185 u8 power; 186 int ret = 0; 187 188 pm_runtime_get_sync(phy->io_dev); 189 190 /* Make sure the transceiver is not in low power mode */ 191 power = musb_readb(addr, MUSB_POWER); 192 power &= ~MUSB_POWER_SUSPENDM; 193 musb_writeb(addr, MUSB_POWER, power); 194 195 musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg); 196 musb_writeb(addr, MUSB_ULPI_REG_DATA, (u8)val); 197 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, MUSB_ULPI_REG_REQ); 198 199 while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL) 200 & MUSB_ULPI_REG_CMPLT)) { 201 i++; 202 if (i == 10000) { 203 ret = -ETIMEDOUT; 204 goto out; 205 } 206 } 207 208 r = musb_readb(addr, MUSB_ULPI_REG_CONTROL); 209 r &= ~MUSB_ULPI_REG_CMPLT; 210 musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r); 211 212 out: 213 pm_runtime_put(phy->io_dev); 214 215 return ret; 216 } 217 #else 218 #define musb_ulpi_read NULL 219 #define musb_ulpi_write NULL 220 #endif 221 222 static struct usb_phy_io_ops musb_ulpi_access = { 223 .read = musb_ulpi_read, 224 .write = musb_ulpi_write, 225 }; 226 227 /*-------------------------------------------------------------------------*/ 228 229 static u32 musb_default_fifo_offset(u8 epnum) 230 { 231 return 0x20 + (epnum * 4); 232 } 233 234 /* "flat" mapping: each endpoint has its own i/o address */ 235 static void musb_flat_ep_select(void __iomem *mbase, u8 epnum) 236 { 237 } 238 239 static u32 musb_flat_ep_offset(u8 epnum, u16 offset) 240 { 241 return 0x100 + (0x10 * epnum) + offset; 242 } 243 244 /* "indexed" mapping: INDEX register controls register bank select */ 245 static void musb_indexed_ep_select(void __iomem *mbase, u8 epnum) 246 { 247 musb_writeb(mbase, MUSB_INDEX, epnum); 248 } 249 250 static u32 musb_indexed_ep_offset(u8 epnum, u16 offset) 251 { 252 return 0x10 + offset; 253 } 254 255 static u32 musb_default_busctl_offset(u8 epnum, u16 offset) 256 { 257 return 0x80 + (0x08 * epnum) + offset; 258 } 259 260 static u8 musb_default_readb(const void __iomem *addr, unsigned offset) 261 { 262 u8 data = __raw_readb(addr + offset); 263 264 trace_musb_readb(__builtin_return_address(0), addr, offset, data); 265 return data; 266 } 267 268 static void musb_default_writeb(void __iomem *addr, unsigned offset, u8 data) 269 { 270 trace_musb_writeb(__builtin_return_address(0), addr, offset, data); 271 __raw_writeb(data, addr + offset); 272 } 273 274 static u16 musb_default_readw(const void __iomem *addr, unsigned offset) 275 { 276 u16 data = __raw_readw(addr + offset); 277 278 trace_musb_readw(__builtin_return_address(0), addr, offset, data); 279 return data; 280 } 281 282 static void musb_default_writew(void __iomem *addr, unsigned offset, u16 data) 283 { 284 trace_musb_writew(__builtin_return_address(0), addr, offset, data); 285 __raw_writew(data, addr + offset); 286 } 287 288 static u32 musb_default_readl(const void __iomem *addr, unsigned offset) 289 { 290 u32 data = __raw_readl(addr + offset); 291 292 trace_musb_readl(__builtin_return_address(0), addr, offset, data); 293 return data; 294 } 295 296 static void musb_default_writel(void __iomem *addr, unsigned offset, u32 data) 297 { 298 trace_musb_writel(__builtin_return_address(0), addr, offset, data); 299 __raw_writel(data, addr + offset); 300 } 301 302 /* 303 * Load an endpoint's FIFO 304 */ 305 static void musb_default_write_fifo(struct musb_hw_ep *hw_ep, u16 len, 306 const u8 *src) 307 { 308 struct musb *musb = hw_ep->musb; 309 void __iomem *fifo = hw_ep->fifo; 310 311 if (unlikely(len == 0)) 312 return; 313 314 prefetch((u8 *)src); 315 316 dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n", 317 'T', hw_ep->epnum, fifo, len, src); 318 319 /* we can't assume unaligned reads work */ 320 if (likely((0x01 & (unsigned long) src) == 0)) { 321 u16 index = 0; 322 323 /* best case is 32bit-aligned source address */ 324 if ((0x02 & (unsigned long) src) == 0) { 325 if (len >= 4) { 326 iowrite32_rep(fifo, src + index, len >> 2); 327 index += len & ~0x03; 328 } 329 if (len & 0x02) { 330 __raw_writew(*(u16 *)&src[index], fifo); 331 index += 2; 332 } 333 } else { 334 if (len >= 2) { 335 iowrite16_rep(fifo, src + index, len >> 1); 336 index += len & ~0x01; 337 } 338 } 339 if (len & 0x01) 340 __raw_writeb(src[index], fifo); 341 } else { 342 /* byte aligned */ 343 iowrite8_rep(fifo, src, len); 344 } 345 } 346 347 /* 348 * Unload an endpoint's FIFO 349 */ 350 static void musb_default_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst) 351 { 352 struct musb *musb = hw_ep->musb; 353 void __iomem *fifo = hw_ep->fifo; 354 355 if (unlikely(len == 0)) 356 return; 357 358 dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n", 359 'R', hw_ep->epnum, fifo, len, dst); 360 361 /* we can't assume unaligned writes work */ 362 if (likely((0x01 & (unsigned long) dst) == 0)) { 363 u16 index = 0; 364 365 /* best case is 32bit-aligned destination address */ 366 if ((0x02 & (unsigned long) dst) == 0) { 367 if (len >= 4) { 368 ioread32_rep(fifo, dst, len >> 2); 369 index = len & ~0x03; 370 } 371 if (len & 0x02) { 372 *(u16 *)&dst[index] = __raw_readw(fifo); 373 index += 2; 374 } 375 } else { 376 if (len >= 2) { 377 ioread16_rep(fifo, dst, len >> 1); 378 index = len & ~0x01; 379 } 380 } 381 if (len & 0x01) 382 dst[index] = __raw_readb(fifo); 383 } else { 384 /* byte aligned */ 385 ioread8_rep(fifo, dst, len); 386 } 387 } 388 389 /* 390 * Old style IO functions 391 */ 392 u8 (*musb_readb)(const void __iomem *addr, unsigned offset); 393 EXPORT_SYMBOL_GPL(musb_readb); 394 395 void (*musb_writeb)(void __iomem *addr, unsigned offset, u8 data); 396 EXPORT_SYMBOL_GPL(musb_writeb); 397 398 u16 (*musb_readw)(const void __iomem *addr, unsigned offset); 399 EXPORT_SYMBOL_GPL(musb_readw); 400 401 void (*musb_writew)(void __iomem *addr, unsigned offset, u16 data); 402 EXPORT_SYMBOL_GPL(musb_writew); 403 404 u32 (*musb_readl)(const void __iomem *addr, unsigned offset); 405 EXPORT_SYMBOL_GPL(musb_readl); 406 407 void (*musb_writel)(void __iomem *addr, unsigned offset, u32 data); 408 EXPORT_SYMBOL_GPL(musb_writel); 409 410 #ifndef CONFIG_MUSB_PIO_ONLY 411 struct dma_controller * 412 (*musb_dma_controller_create)(struct musb *musb, void __iomem *base); 413 EXPORT_SYMBOL(musb_dma_controller_create); 414 415 void (*musb_dma_controller_destroy)(struct dma_controller *c); 416 EXPORT_SYMBOL(musb_dma_controller_destroy); 417 #endif 418 419 /* 420 * New style IO functions 421 */ 422 void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst) 423 { 424 return hw_ep->musb->io.read_fifo(hw_ep, len, dst); 425 } 426 427 void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src) 428 { 429 return hw_ep->musb->io.write_fifo(hw_ep, len, src); 430 } 431 432 /*-------------------------------------------------------------------------*/ 433 434 /* for high speed test mode; see USB 2.0 spec 7.1.20 */ 435 static const u8 musb_test_packet[53] = { 436 /* implicit SYNC then DATA0 to start */ 437 438 /* JKJKJKJK x9 */ 439 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 440 /* JJKKJJKK x8 */ 441 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 442 /* JJJJKKKK x8 */ 443 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 444 /* JJJJJJJKKKKKKK x8 */ 445 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 446 /* JJJJJJJK x8 */ 447 0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 448 /* JKKKKKKK x10, JK */ 449 0xfc, 0x7e, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0x7e 450 451 /* implicit CRC16 then EOP to end */ 452 }; 453 454 void musb_load_testpacket(struct musb *musb) 455 { 456 void __iomem *regs = musb->endpoints[0].regs; 457 458 musb_ep_select(musb->mregs, 0); 459 musb_write_fifo(musb->control_ep, 460 sizeof(musb_test_packet), musb_test_packet); 461 musb_writew(regs, MUSB_CSR0, MUSB_CSR0_TXPKTRDY); 462 } 463 464 /*-------------------------------------------------------------------------*/ 465 466 /* 467 * Handles OTG hnp timeouts, such as b_ase0_brst 468 */ 469 static void musb_otg_timer_func(unsigned long data) 470 { 471 struct musb *musb = (struct musb *)data; 472 unsigned long flags; 473 474 spin_lock_irqsave(&musb->lock, flags); 475 switch (musb->xceiv->otg->state) { 476 case OTG_STATE_B_WAIT_ACON: 477 musb_dbg(musb, 478 "HNP: b_wait_acon timeout; back to b_peripheral"); 479 musb_g_disconnect(musb); 480 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL; 481 musb->is_active = 0; 482 break; 483 case OTG_STATE_A_SUSPEND: 484 case OTG_STATE_A_WAIT_BCON: 485 musb_dbg(musb, "HNP: %s timeout", 486 usb_otg_state_string(musb->xceiv->otg->state)); 487 musb_platform_set_vbus(musb, 0); 488 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL; 489 break; 490 default: 491 musb_dbg(musb, "HNP: Unhandled mode %s", 492 usb_otg_state_string(musb->xceiv->otg->state)); 493 } 494 spin_unlock_irqrestore(&musb->lock, flags); 495 } 496 497 /* 498 * Stops the HNP transition. Caller must take care of locking. 499 */ 500 void musb_hnp_stop(struct musb *musb) 501 { 502 struct usb_hcd *hcd = musb->hcd; 503 void __iomem *mbase = musb->mregs; 504 u8 reg; 505 506 musb_dbg(musb, "HNP: stop from %s", 507 usb_otg_state_string(musb->xceiv->otg->state)); 508 509 switch (musb->xceiv->otg->state) { 510 case OTG_STATE_A_PERIPHERAL: 511 musb_g_disconnect(musb); 512 musb_dbg(musb, "HNP: back to %s", 513 usb_otg_state_string(musb->xceiv->otg->state)); 514 break; 515 case OTG_STATE_B_HOST: 516 musb_dbg(musb, "HNP: Disabling HR"); 517 if (hcd) 518 hcd->self.is_b_host = 0; 519 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL; 520 MUSB_DEV_MODE(musb); 521 reg = musb_readb(mbase, MUSB_POWER); 522 reg |= MUSB_POWER_SUSPENDM; 523 musb_writeb(mbase, MUSB_POWER, reg); 524 /* REVISIT: Start SESSION_REQUEST here? */ 525 break; 526 default: 527 musb_dbg(musb, "HNP: Stopping in unknown state %s", 528 usb_otg_state_string(musb->xceiv->otg->state)); 529 } 530 531 /* 532 * When returning to A state after HNP, avoid hub_port_rebounce(), 533 * which cause occasional OPT A "Did not receive reset after connect" 534 * errors. 535 */ 536 musb->port1_status &= ~(USB_PORT_STAT_C_CONNECTION << 16); 537 } 538 539 static void musb_recover_from_babble(struct musb *musb); 540 541 /* 542 * Interrupt Service Routine to record USB "global" interrupts. 543 * Since these do not happen often and signify things of 544 * paramount importance, it seems OK to check them individually; 545 * the order of the tests is specified in the manual 546 * 547 * @param musb instance pointer 548 * @param int_usb register contents 549 * @param devctl 550 * @param power 551 */ 552 553 static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb, 554 u8 devctl) 555 { 556 irqreturn_t handled = IRQ_NONE; 557 558 musb_dbg(musb, "<== DevCtl=%02x, int_usb=0x%x", devctl, int_usb); 559 560 /* in host mode, the peripheral may issue remote wakeup. 561 * in peripheral mode, the host may resume the link. 562 * spurious RESUME irqs happen too, paired with SUSPEND. 563 */ 564 if (int_usb & MUSB_INTR_RESUME) { 565 handled = IRQ_HANDLED; 566 musb_dbg(musb, "RESUME (%s)", 567 usb_otg_state_string(musb->xceiv->otg->state)); 568 569 if (devctl & MUSB_DEVCTL_HM) { 570 switch (musb->xceiv->otg->state) { 571 case OTG_STATE_A_SUSPEND: 572 /* remote wakeup? later, GetPortStatus 573 * will stop RESUME signaling 574 */ 575 576 musb->port1_status |= 577 (USB_PORT_STAT_C_SUSPEND << 16) 578 | MUSB_PORT_STAT_RESUME; 579 musb->rh_timer = jiffies 580 + msecs_to_jiffies(USB_RESUME_TIMEOUT); 581 musb->need_finish_resume = 1; 582 583 musb->xceiv->otg->state = OTG_STATE_A_HOST; 584 musb->is_active = 1; 585 musb_host_resume_root_hub(musb); 586 break; 587 case OTG_STATE_B_WAIT_ACON: 588 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL; 589 musb->is_active = 1; 590 MUSB_DEV_MODE(musb); 591 break; 592 default: 593 WARNING("bogus %s RESUME (%s)\n", 594 "host", 595 usb_otg_state_string(musb->xceiv->otg->state)); 596 } 597 } else { 598 switch (musb->xceiv->otg->state) { 599 case OTG_STATE_A_SUSPEND: 600 /* possibly DISCONNECT is upcoming */ 601 musb->xceiv->otg->state = OTG_STATE_A_HOST; 602 musb_host_resume_root_hub(musb); 603 break; 604 case OTG_STATE_B_WAIT_ACON: 605 case OTG_STATE_B_PERIPHERAL: 606 /* disconnect while suspended? we may 607 * not get a disconnect irq... 608 */ 609 if ((devctl & MUSB_DEVCTL_VBUS) 610 != (3 << MUSB_DEVCTL_VBUS_SHIFT) 611 ) { 612 musb->int_usb |= MUSB_INTR_DISCONNECT; 613 musb->int_usb &= ~MUSB_INTR_SUSPEND; 614 break; 615 } 616 musb_g_resume(musb); 617 break; 618 case OTG_STATE_B_IDLE: 619 musb->int_usb &= ~MUSB_INTR_SUSPEND; 620 break; 621 default: 622 WARNING("bogus %s RESUME (%s)\n", 623 "peripheral", 624 usb_otg_state_string(musb->xceiv->otg->state)); 625 } 626 } 627 } 628 629 /* see manual for the order of the tests */ 630 if (int_usb & MUSB_INTR_SESSREQ) { 631 void __iomem *mbase = musb->mregs; 632 633 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS 634 && (devctl & MUSB_DEVCTL_BDEVICE)) { 635 musb_dbg(musb, "SessReq while on B state"); 636 return IRQ_HANDLED; 637 } 638 639 musb_dbg(musb, "SESSION_REQUEST (%s)", 640 usb_otg_state_string(musb->xceiv->otg->state)); 641 642 /* IRQ arrives from ID pin sense or (later, if VBUS power 643 * is removed) SRP. responses are time critical: 644 * - turn on VBUS (with silicon-specific mechanism) 645 * - go through A_WAIT_VRISE 646 * - ... to A_WAIT_BCON. 647 * a_wait_vrise_tmout triggers VBUS_ERROR transitions 648 */ 649 musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION); 650 musb->ep0_stage = MUSB_EP0_START; 651 musb->xceiv->otg->state = OTG_STATE_A_IDLE; 652 MUSB_HST_MODE(musb); 653 musb_platform_set_vbus(musb, 1); 654 655 handled = IRQ_HANDLED; 656 } 657 658 if (int_usb & MUSB_INTR_VBUSERROR) { 659 int ignore = 0; 660 661 /* During connection as an A-Device, we may see a short 662 * current spikes causing voltage drop, because of cable 663 * and peripheral capacitance combined with vbus draw. 664 * (So: less common with truly self-powered devices, where 665 * vbus doesn't act like a power supply.) 666 * 667 * Such spikes are short; usually less than ~500 usec, max 668 * of ~2 msec. That is, they're not sustained overcurrent 669 * errors, though they're reported using VBUSERROR irqs. 670 * 671 * Workarounds: (a) hardware: use self powered devices. 672 * (b) software: ignore non-repeated VBUS errors. 673 * 674 * REVISIT: do delays from lots of DEBUG_KERNEL checks 675 * make trouble here, keeping VBUS < 4.4V ? 676 */ 677 switch (musb->xceiv->otg->state) { 678 case OTG_STATE_A_HOST: 679 /* recovery is dicey once we've gotten past the 680 * initial stages of enumeration, but if VBUS 681 * stayed ok at the other end of the link, and 682 * another reset is due (at least for high speed, 683 * to redo the chirp etc), it might work OK... 684 */ 685 case OTG_STATE_A_WAIT_BCON: 686 case OTG_STATE_A_WAIT_VRISE: 687 if (musb->vbuserr_retry) { 688 void __iomem *mbase = musb->mregs; 689 690 musb->vbuserr_retry--; 691 ignore = 1; 692 devctl |= MUSB_DEVCTL_SESSION; 693 musb_writeb(mbase, MUSB_DEVCTL, devctl); 694 } else { 695 musb->port1_status |= 696 USB_PORT_STAT_OVERCURRENT 697 | (USB_PORT_STAT_C_OVERCURRENT << 16); 698 } 699 break; 700 default: 701 break; 702 } 703 704 dev_printk(ignore ? KERN_DEBUG : KERN_ERR, musb->controller, 705 "VBUS_ERROR in %s (%02x, %s), retry #%d, port1 %08x\n", 706 usb_otg_state_string(musb->xceiv->otg->state), 707 devctl, 708 ({ char *s; 709 switch (devctl & MUSB_DEVCTL_VBUS) { 710 case 0 << MUSB_DEVCTL_VBUS_SHIFT: 711 s = "<SessEnd"; break; 712 case 1 << MUSB_DEVCTL_VBUS_SHIFT: 713 s = "<AValid"; break; 714 case 2 << MUSB_DEVCTL_VBUS_SHIFT: 715 s = "<VBusValid"; break; 716 /* case 3 << MUSB_DEVCTL_VBUS_SHIFT: */ 717 default: 718 s = "VALID"; break; 719 } s; }), 720 VBUSERR_RETRY_COUNT - musb->vbuserr_retry, 721 musb->port1_status); 722 723 /* go through A_WAIT_VFALL then start a new session */ 724 if (!ignore) 725 musb_platform_set_vbus(musb, 0); 726 handled = IRQ_HANDLED; 727 } 728 729 if (int_usb & MUSB_INTR_SUSPEND) { 730 musb_dbg(musb, "SUSPEND (%s) devctl %02x", 731 usb_otg_state_string(musb->xceiv->otg->state), devctl); 732 handled = IRQ_HANDLED; 733 734 switch (musb->xceiv->otg->state) { 735 case OTG_STATE_A_PERIPHERAL: 736 /* We also come here if the cable is removed, since 737 * this silicon doesn't report ID-no-longer-grounded. 738 * 739 * We depend on T(a_wait_bcon) to shut us down, and 740 * hope users don't do anything dicey during this 741 * undesired detour through A_WAIT_BCON. 742 */ 743 musb_hnp_stop(musb); 744 musb_host_resume_root_hub(musb); 745 musb_root_disconnect(musb); 746 musb_platform_try_idle(musb, jiffies 747 + msecs_to_jiffies(musb->a_wait_bcon 748 ? : OTG_TIME_A_WAIT_BCON)); 749 750 break; 751 case OTG_STATE_B_IDLE: 752 if (!musb->is_active) 753 break; 754 case OTG_STATE_B_PERIPHERAL: 755 musb_g_suspend(musb); 756 musb->is_active = musb->g.b_hnp_enable; 757 if (musb->is_active) { 758 musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON; 759 musb_dbg(musb, "HNP: Setting timer for b_ase0_brst"); 760 mod_timer(&musb->otg_timer, jiffies 761 + msecs_to_jiffies( 762 OTG_TIME_B_ASE0_BRST)); 763 } 764 break; 765 case OTG_STATE_A_WAIT_BCON: 766 if (musb->a_wait_bcon != 0) 767 musb_platform_try_idle(musb, jiffies 768 + msecs_to_jiffies(musb->a_wait_bcon)); 769 break; 770 case OTG_STATE_A_HOST: 771 musb->xceiv->otg->state = OTG_STATE_A_SUSPEND; 772 musb->is_active = musb->hcd->self.b_hnp_enable; 773 break; 774 case OTG_STATE_B_HOST: 775 /* Transition to B_PERIPHERAL, see 6.8.2.6 p 44 */ 776 musb_dbg(musb, "REVISIT: SUSPEND as B_HOST"); 777 break; 778 default: 779 /* "should not happen" */ 780 musb->is_active = 0; 781 break; 782 } 783 } 784 785 if (int_usb & MUSB_INTR_CONNECT) { 786 struct usb_hcd *hcd = musb->hcd; 787 788 handled = IRQ_HANDLED; 789 musb->is_active = 1; 790 791 musb->ep0_stage = MUSB_EP0_START; 792 793 musb->intrtxe = musb->epmask; 794 musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe); 795 musb->intrrxe = musb->epmask & 0xfffe; 796 musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe); 797 musb_writeb(musb->mregs, MUSB_INTRUSBE, 0xf7); 798 musb->port1_status &= ~(USB_PORT_STAT_LOW_SPEED 799 |USB_PORT_STAT_HIGH_SPEED 800 |USB_PORT_STAT_ENABLE 801 ); 802 musb->port1_status |= USB_PORT_STAT_CONNECTION 803 |(USB_PORT_STAT_C_CONNECTION << 16); 804 805 /* high vs full speed is just a guess until after reset */ 806 if (devctl & MUSB_DEVCTL_LSDEV) 807 musb->port1_status |= USB_PORT_STAT_LOW_SPEED; 808 809 /* indicate new connection to OTG machine */ 810 switch (musb->xceiv->otg->state) { 811 case OTG_STATE_B_PERIPHERAL: 812 if (int_usb & MUSB_INTR_SUSPEND) { 813 musb_dbg(musb, "HNP: SUSPEND+CONNECT, now b_host"); 814 int_usb &= ~MUSB_INTR_SUSPEND; 815 goto b_host; 816 } else 817 musb_dbg(musb, "CONNECT as b_peripheral???"); 818 break; 819 case OTG_STATE_B_WAIT_ACON: 820 musb_dbg(musb, "HNP: CONNECT, now b_host"); 821 b_host: 822 musb->xceiv->otg->state = OTG_STATE_B_HOST; 823 if (musb->hcd) 824 musb->hcd->self.is_b_host = 1; 825 del_timer(&musb->otg_timer); 826 break; 827 default: 828 if ((devctl & MUSB_DEVCTL_VBUS) 829 == (3 << MUSB_DEVCTL_VBUS_SHIFT)) { 830 musb->xceiv->otg->state = OTG_STATE_A_HOST; 831 if (hcd) 832 hcd->self.is_b_host = 0; 833 } 834 break; 835 } 836 837 musb_host_poke_root_hub(musb); 838 839 musb_dbg(musb, "CONNECT (%s) devctl %02x", 840 usb_otg_state_string(musb->xceiv->otg->state), devctl); 841 } 842 843 if (int_usb & MUSB_INTR_DISCONNECT) { 844 musb_dbg(musb, "DISCONNECT (%s) as %s, devctl %02x", 845 usb_otg_state_string(musb->xceiv->otg->state), 846 MUSB_MODE(musb), devctl); 847 handled = IRQ_HANDLED; 848 849 switch (musb->xceiv->otg->state) { 850 case OTG_STATE_A_HOST: 851 case OTG_STATE_A_SUSPEND: 852 musb_host_resume_root_hub(musb); 853 musb_root_disconnect(musb); 854 if (musb->a_wait_bcon != 0) 855 musb_platform_try_idle(musb, jiffies 856 + msecs_to_jiffies(musb->a_wait_bcon)); 857 break; 858 case OTG_STATE_B_HOST: 859 /* REVISIT this behaves for "real disconnect" 860 * cases; make sure the other transitions from 861 * from B_HOST act right too. The B_HOST code 862 * in hnp_stop() is currently not used... 863 */ 864 musb_root_disconnect(musb); 865 if (musb->hcd) 866 musb->hcd->self.is_b_host = 0; 867 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL; 868 MUSB_DEV_MODE(musb); 869 musb_g_disconnect(musb); 870 break; 871 case OTG_STATE_A_PERIPHERAL: 872 musb_hnp_stop(musb); 873 musb_root_disconnect(musb); 874 /* FALLTHROUGH */ 875 case OTG_STATE_B_WAIT_ACON: 876 /* FALLTHROUGH */ 877 case OTG_STATE_B_PERIPHERAL: 878 case OTG_STATE_B_IDLE: 879 musb_g_disconnect(musb); 880 break; 881 default: 882 WARNING("unhandled DISCONNECT transition (%s)\n", 883 usb_otg_state_string(musb->xceiv->otg->state)); 884 break; 885 } 886 } 887 888 /* mentor saves a bit: bus reset and babble share the same irq. 889 * only host sees babble; only peripheral sees bus reset. 890 */ 891 if (int_usb & MUSB_INTR_RESET) { 892 handled = IRQ_HANDLED; 893 if (devctl & MUSB_DEVCTL_HM) { 894 /* 895 * When BABBLE happens what we can depends on which 896 * platform MUSB is running, because some platforms 897 * implemented proprietary means for 'recovering' from 898 * Babble conditions. One such platform is AM335x. In 899 * most cases, however, the only thing we can do is 900 * drop the session. 901 */ 902 dev_err(musb->controller, "Babble\n"); 903 904 if (is_host_active(musb)) 905 musb_recover_from_babble(musb); 906 } else { 907 musb_dbg(musb, "BUS RESET as %s", 908 usb_otg_state_string(musb->xceiv->otg->state)); 909 switch (musb->xceiv->otg->state) { 910 case OTG_STATE_A_SUSPEND: 911 musb_g_reset(musb); 912 /* FALLTHROUGH */ 913 case OTG_STATE_A_WAIT_BCON: /* OPT TD.4.7-900ms */ 914 /* never use invalid T(a_wait_bcon) */ 915 musb_dbg(musb, "HNP: in %s, %d msec timeout", 916 usb_otg_state_string(musb->xceiv->otg->state), 917 TA_WAIT_BCON(musb)); 918 mod_timer(&musb->otg_timer, jiffies 919 + msecs_to_jiffies(TA_WAIT_BCON(musb))); 920 break; 921 case OTG_STATE_A_PERIPHERAL: 922 del_timer(&musb->otg_timer); 923 musb_g_reset(musb); 924 break; 925 case OTG_STATE_B_WAIT_ACON: 926 musb_dbg(musb, "HNP: RESET (%s), to b_peripheral", 927 usb_otg_state_string(musb->xceiv->otg->state)); 928 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL; 929 musb_g_reset(musb); 930 break; 931 case OTG_STATE_B_IDLE: 932 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL; 933 /* FALLTHROUGH */ 934 case OTG_STATE_B_PERIPHERAL: 935 musb_g_reset(musb); 936 break; 937 default: 938 musb_dbg(musb, "Unhandled BUS RESET as %s", 939 usb_otg_state_string(musb->xceiv->otg->state)); 940 } 941 } 942 } 943 944 #if 0 945 /* REVISIT ... this would be for multiplexing periodic endpoints, or 946 * supporting transfer phasing to prevent exceeding ISO bandwidth 947 * limits of a given frame or microframe. 948 * 949 * It's not needed for peripheral side, which dedicates endpoints; 950 * though it _might_ use SOF irqs for other purposes. 951 * 952 * And it's not currently needed for host side, which also dedicates 953 * endpoints, relies on TX/RX interval registers, and isn't claimed 954 * to support ISO transfers yet. 955 */ 956 if (int_usb & MUSB_INTR_SOF) { 957 void __iomem *mbase = musb->mregs; 958 struct musb_hw_ep *ep; 959 u8 epnum; 960 u16 frame; 961 962 dev_dbg(musb->controller, "START_OF_FRAME\n"); 963 handled = IRQ_HANDLED; 964 965 /* start any periodic Tx transfers waiting for current frame */ 966 frame = musb_readw(mbase, MUSB_FRAME); 967 ep = musb->endpoints; 968 for (epnum = 1; (epnum < musb->nr_endpoints) 969 && (musb->epmask >= (1 << epnum)); 970 epnum++, ep++) { 971 /* 972 * FIXME handle framecounter wraps (12 bits) 973 * eliminate duplicated StartUrb logic 974 */ 975 if (ep->dwWaitFrame >= frame) { 976 ep->dwWaitFrame = 0; 977 pr_debug("SOF --> periodic TX%s on %d\n", 978 ep->tx_channel ? " DMA" : "", 979 epnum); 980 if (!ep->tx_channel) 981 musb_h_tx_start(musb, epnum); 982 else 983 cppi_hostdma_start(musb, epnum); 984 } 985 } /* end of for loop */ 986 } 987 #endif 988 989 schedule_work(&musb->irq_work); 990 991 return handled; 992 } 993 994 /*-------------------------------------------------------------------------*/ 995 996 static void musb_disable_interrupts(struct musb *musb) 997 { 998 void __iomem *mbase = musb->mregs; 999 u16 temp; 1000 1001 /* disable interrupts */ 1002 musb_writeb(mbase, MUSB_INTRUSBE, 0); 1003 musb->intrtxe = 0; 1004 musb_writew(mbase, MUSB_INTRTXE, 0); 1005 musb->intrrxe = 0; 1006 musb_writew(mbase, MUSB_INTRRXE, 0); 1007 1008 /* flush pending interrupts */ 1009 temp = musb_readb(mbase, MUSB_INTRUSB); 1010 temp = musb_readw(mbase, MUSB_INTRTX); 1011 temp = musb_readw(mbase, MUSB_INTRRX); 1012 } 1013 1014 static void musb_enable_interrupts(struct musb *musb) 1015 { 1016 void __iomem *regs = musb->mregs; 1017 1018 /* Set INT enable registers, enable interrupts */ 1019 musb->intrtxe = musb->epmask; 1020 musb_writew(regs, MUSB_INTRTXE, musb->intrtxe); 1021 musb->intrrxe = musb->epmask & 0xfffe; 1022 musb_writew(regs, MUSB_INTRRXE, musb->intrrxe); 1023 musb_writeb(regs, MUSB_INTRUSBE, 0xf7); 1024 1025 } 1026 1027 static void musb_generic_disable(struct musb *musb) 1028 { 1029 void __iomem *mbase = musb->mregs; 1030 1031 musb_disable_interrupts(musb); 1032 1033 /* off */ 1034 musb_writeb(mbase, MUSB_DEVCTL, 0); 1035 } 1036 1037 /* 1038 * Program the HDRC to start (enable interrupts, dma, etc.). 1039 */ 1040 void musb_start(struct musb *musb) 1041 { 1042 void __iomem *regs = musb->mregs; 1043 u8 devctl = musb_readb(regs, MUSB_DEVCTL); 1044 u8 power; 1045 1046 musb_dbg(musb, "<== devctl %02x", devctl); 1047 1048 musb_enable_interrupts(musb); 1049 musb_writeb(regs, MUSB_TESTMODE, 0); 1050 1051 power = MUSB_POWER_ISOUPDATE; 1052 /* 1053 * treating UNKNOWN as unspecified maximum speed, in which case 1054 * we will default to high-speed. 1055 */ 1056 if (musb->config->maximum_speed == USB_SPEED_HIGH || 1057 musb->config->maximum_speed == USB_SPEED_UNKNOWN) 1058 power |= MUSB_POWER_HSENAB; 1059 musb_writeb(regs, MUSB_POWER, power); 1060 1061 musb->is_active = 0; 1062 devctl = musb_readb(regs, MUSB_DEVCTL); 1063 devctl &= ~MUSB_DEVCTL_SESSION; 1064 1065 /* session started after: 1066 * (a) ID-grounded irq, host mode; 1067 * (b) vbus present/connect IRQ, peripheral mode; 1068 * (c) peripheral initiates, using SRP 1069 */ 1070 if (musb->port_mode != MUSB_PORT_MODE_HOST && 1071 musb->xceiv->otg->state != OTG_STATE_A_WAIT_BCON && 1072 (devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) { 1073 musb->is_active = 1; 1074 } else { 1075 devctl |= MUSB_DEVCTL_SESSION; 1076 } 1077 1078 musb_platform_enable(musb); 1079 musb_writeb(regs, MUSB_DEVCTL, devctl); 1080 } 1081 1082 /* 1083 * Make the HDRC stop (disable interrupts, etc.); 1084 * reversible by musb_start 1085 * called on gadget driver unregister 1086 * with controller locked, irqs blocked 1087 * acts as a NOP unless some role activated the hardware 1088 */ 1089 void musb_stop(struct musb *musb) 1090 { 1091 /* stop IRQs, timers, ... */ 1092 musb_platform_disable(musb); 1093 musb_generic_disable(musb); 1094 musb_dbg(musb, "HDRC disabled"); 1095 1096 /* FIXME 1097 * - mark host and/or peripheral drivers unusable/inactive 1098 * - disable DMA (and enable it in HdrcStart) 1099 * - make sure we can musb_start() after musb_stop(); with 1100 * OTG mode, gadget driver module rmmod/modprobe cycles that 1101 * - ... 1102 */ 1103 musb_platform_try_idle(musb, 0); 1104 } 1105 1106 /*-------------------------------------------------------------------------*/ 1107 1108 /* 1109 * The silicon either has hard-wired endpoint configurations, or else 1110 * "dynamic fifo" sizing. The driver has support for both, though at this 1111 * writing only the dynamic sizing is very well tested. Since we switched 1112 * away from compile-time hardware parameters, we can no longer rely on 1113 * dead code elimination to leave only the relevant one in the object file. 1114 * 1115 * We don't currently use dynamic fifo setup capability to do anything 1116 * more than selecting one of a bunch of predefined configurations. 1117 */ 1118 static ushort fifo_mode; 1119 1120 /* "modprobe ... fifo_mode=1" etc */ 1121 module_param(fifo_mode, ushort, 0); 1122 MODULE_PARM_DESC(fifo_mode, "initial endpoint configuration"); 1123 1124 /* 1125 * tables defining fifo_mode values. define more if you like. 1126 * for host side, make sure both halves of ep1 are set up. 1127 */ 1128 1129 /* mode 0 - fits in 2KB */ 1130 static struct musb_fifo_cfg mode_0_cfg[] = { 1131 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, 1132 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, 1133 { .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, }, 1134 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, }, 1135 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, }, 1136 }; 1137 1138 /* mode 1 - fits in 4KB */ 1139 static struct musb_fifo_cfg mode_1_cfg[] = { 1140 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, }, 1141 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, }, 1142 { .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, .mode = BUF_DOUBLE, }, 1143 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, }, 1144 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, }, 1145 }; 1146 1147 /* mode 2 - fits in 4KB */ 1148 static struct musb_fifo_cfg mode_2_cfg[] = { 1149 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, 1150 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, 1151 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, 1152 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, 1153 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, }, 1154 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, }, 1155 }; 1156 1157 /* mode 3 - fits in 4KB */ 1158 static struct musb_fifo_cfg mode_3_cfg[] = { 1159 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, }, 1160 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, }, 1161 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, 1162 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, 1163 { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, }, 1164 { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, }, 1165 }; 1166 1167 /* mode 4 - fits in 16KB */ 1168 static struct musb_fifo_cfg mode_4_cfg[] = { 1169 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, 1170 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, 1171 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, 1172 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, 1173 { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, }, 1174 { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, }, 1175 { .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, }, 1176 { .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, }, 1177 { .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, }, 1178 { .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, }, 1179 { .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 512, }, 1180 { .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 512, }, 1181 { .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, }, 1182 { .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 512, }, 1183 { .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 512, }, 1184 { .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 512, }, 1185 { .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 512, }, 1186 { .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 512, }, 1187 { .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 256, }, 1188 { .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 64, }, 1189 { .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 256, }, 1190 { .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 64, }, 1191 { .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 256, }, 1192 { .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 64, }, 1193 { .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 4096, }, 1194 { .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, }, 1195 { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, }, 1196 }; 1197 1198 /* mode 5 - fits in 8KB */ 1199 static struct musb_fifo_cfg mode_5_cfg[] = { 1200 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, 1201 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, 1202 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, 1203 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, 1204 { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, }, 1205 { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, }, 1206 { .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, }, 1207 { .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, }, 1208 { .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, }, 1209 { .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, }, 1210 { .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 32, }, 1211 { .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 32, }, 1212 { .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 32, }, 1213 { .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 32, }, 1214 { .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 32, }, 1215 { .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 32, }, 1216 { .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 32, }, 1217 { .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 32, }, 1218 { .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 32, }, 1219 { .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 32, }, 1220 { .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 32, }, 1221 { .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 32, }, 1222 { .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 32, }, 1223 { .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 32, }, 1224 { .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 512, }, 1225 { .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, }, 1226 { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, }, 1227 }; 1228 1229 /* 1230 * configure a fifo; for non-shared endpoints, this may be called 1231 * once for a tx fifo and once for an rx fifo. 1232 * 1233 * returns negative errno or offset for next fifo. 1234 */ 1235 static int 1236 fifo_setup(struct musb *musb, struct musb_hw_ep *hw_ep, 1237 const struct musb_fifo_cfg *cfg, u16 offset) 1238 { 1239 void __iomem *mbase = musb->mregs; 1240 int size = 0; 1241 u16 maxpacket = cfg->maxpacket; 1242 u16 c_off = offset >> 3; 1243 u8 c_size; 1244 1245 /* expect hw_ep has already been zero-initialized */ 1246 1247 size = ffs(max(maxpacket, (u16) 8)) - 1; 1248 maxpacket = 1 << size; 1249 1250 c_size = size - 3; 1251 if (cfg->mode == BUF_DOUBLE) { 1252 if ((offset + (maxpacket << 1)) > 1253 (1 << (musb->config->ram_bits + 2))) 1254 return -EMSGSIZE; 1255 c_size |= MUSB_FIFOSZ_DPB; 1256 } else { 1257 if ((offset + maxpacket) > (1 << (musb->config->ram_bits + 2))) 1258 return -EMSGSIZE; 1259 } 1260 1261 /* configure the FIFO */ 1262 musb_writeb(mbase, MUSB_INDEX, hw_ep->epnum); 1263 1264 /* EP0 reserved endpoint for control, bidirectional; 1265 * EP1 reserved for bulk, two unidirectional halves. 1266 */ 1267 if (hw_ep->epnum == 1) 1268 musb->bulk_ep = hw_ep; 1269 /* REVISIT error check: be sure ep0 can both rx and tx ... */ 1270 switch (cfg->style) { 1271 case FIFO_TX: 1272 musb_write_txfifosz(mbase, c_size); 1273 musb_write_txfifoadd(mbase, c_off); 1274 hw_ep->tx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB); 1275 hw_ep->max_packet_sz_tx = maxpacket; 1276 break; 1277 case FIFO_RX: 1278 musb_write_rxfifosz(mbase, c_size); 1279 musb_write_rxfifoadd(mbase, c_off); 1280 hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB); 1281 hw_ep->max_packet_sz_rx = maxpacket; 1282 break; 1283 case FIFO_RXTX: 1284 musb_write_txfifosz(mbase, c_size); 1285 musb_write_txfifoadd(mbase, c_off); 1286 hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB); 1287 hw_ep->max_packet_sz_rx = maxpacket; 1288 1289 musb_write_rxfifosz(mbase, c_size); 1290 musb_write_rxfifoadd(mbase, c_off); 1291 hw_ep->tx_double_buffered = hw_ep->rx_double_buffered; 1292 hw_ep->max_packet_sz_tx = maxpacket; 1293 1294 hw_ep->is_shared_fifo = true; 1295 break; 1296 } 1297 1298 /* NOTE rx and tx endpoint irqs aren't managed separately, 1299 * which happens to be ok 1300 */ 1301 musb->epmask |= (1 << hw_ep->epnum); 1302 1303 return offset + (maxpacket << ((c_size & MUSB_FIFOSZ_DPB) ? 1 : 0)); 1304 } 1305 1306 static struct musb_fifo_cfg ep0_cfg = { 1307 .style = FIFO_RXTX, .maxpacket = 64, 1308 }; 1309 1310 static int ep_config_from_table(struct musb *musb) 1311 { 1312 const struct musb_fifo_cfg *cfg; 1313 unsigned i, n; 1314 int offset; 1315 struct musb_hw_ep *hw_ep = musb->endpoints; 1316 1317 if (musb->config->fifo_cfg) { 1318 cfg = musb->config->fifo_cfg; 1319 n = musb->config->fifo_cfg_size; 1320 goto done; 1321 } 1322 1323 switch (fifo_mode) { 1324 default: 1325 fifo_mode = 0; 1326 /* FALLTHROUGH */ 1327 case 0: 1328 cfg = mode_0_cfg; 1329 n = ARRAY_SIZE(mode_0_cfg); 1330 break; 1331 case 1: 1332 cfg = mode_1_cfg; 1333 n = ARRAY_SIZE(mode_1_cfg); 1334 break; 1335 case 2: 1336 cfg = mode_2_cfg; 1337 n = ARRAY_SIZE(mode_2_cfg); 1338 break; 1339 case 3: 1340 cfg = mode_3_cfg; 1341 n = ARRAY_SIZE(mode_3_cfg); 1342 break; 1343 case 4: 1344 cfg = mode_4_cfg; 1345 n = ARRAY_SIZE(mode_4_cfg); 1346 break; 1347 case 5: 1348 cfg = mode_5_cfg; 1349 n = ARRAY_SIZE(mode_5_cfg); 1350 break; 1351 } 1352 1353 pr_debug("%s: setup fifo_mode %d\n", musb_driver_name, fifo_mode); 1354 1355 1356 done: 1357 offset = fifo_setup(musb, hw_ep, &ep0_cfg, 0); 1358 /* assert(offset > 0) */ 1359 1360 /* NOTE: for RTL versions >= 1.400 EPINFO and RAMINFO would 1361 * be better than static musb->config->num_eps and DYN_FIFO_SIZE... 1362 */ 1363 1364 for (i = 0; i < n; i++) { 1365 u8 epn = cfg->hw_ep_num; 1366 1367 if (epn >= musb->config->num_eps) { 1368 pr_debug("%s: invalid ep %d\n", 1369 musb_driver_name, epn); 1370 return -EINVAL; 1371 } 1372 offset = fifo_setup(musb, hw_ep + epn, cfg++, offset); 1373 if (offset < 0) { 1374 pr_debug("%s: mem overrun, ep %d\n", 1375 musb_driver_name, epn); 1376 return offset; 1377 } 1378 epn++; 1379 musb->nr_endpoints = max(epn, musb->nr_endpoints); 1380 } 1381 1382 pr_debug("%s: %d/%d max ep, %d/%d memory\n", 1383 musb_driver_name, 1384 n + 1, musb->config->num_eps * 2 - 1, 1385 offset, (1 << (musb->config->ram_bits + 2))); 1386 1387 if (!musb->bulk_ep) { 1388 pr_debug("%s: missing bulk\n", musb_driver_name); 1389 return -EINVAL; 1390 } 1391 1392 return 0; 1393 } 1394 1395 1396 /* 1397 * ep_config_from_hw - when MUSB_C_DYNFIFO_DEF is false 1398 * @param musb the controller 1399 */ 1400 static int ep_config_from_hw(struct musb *musb) 1401 { 1402 u8 epnum = 0; 1403 struct musb_hw_ep *hw_ep; 1404 void __iomem *mbase = musb->mregs; 1405 int ret = 0; 1406 1407 musb_dbg(musb, "<== static silicon ep config"); 1408 1409 /* FIXME pick up ep0 maxpacket size */ 1410 1411 for (epnum = 1; epnum < musb->config->num_eps; epnum++) { 1412 musb_ep_select(mbase, epnum); 1413 hw_ep = musb->endpoints + epnum; 1414 1415 ret = musb_read_fifosize(musb, hw_ep, epnum); 1416 if (ret < 0) 1417 break; 1418 1419 /* FIXME set up hw_ep->{rx,tx}_double_buffered */ 1420 1421 /* pick an RX/TX endpoint for bulk */ 1422 if (hw_ep->max_packet_sz_tx < 512 1423 || hw_ep->max_packet_sz_rx < 512) 1424 continue; 1425 1426 /* REVISIT: this algorithm is lazy, we should at least 1427 * try to pick a double buffered endpoint. 1428 */ 1429 if (musb->bulk_ep) 1430 continue; 1431 musb->bulk_ep = hw_ep; 1432 } 1433 1434 if (!musb->bulk_ep) { 1435 pr_debug("%s: missing bulk\n", musb_driver_name); 1436 return -EINVAL; 1437 } 1438 1439 return 0; 1440 } 1441 1442 enum { MUSB_CONTROLLER_MHDRC, MUSB_CONTROLLER_HDRC, }; 1443 1444 /* Initialize MUSB (M)HDRC part of the USB hardware subsystem; 1445 * configure endpoints, or take their config from silicon 1446 */ 1447 static int musb_core_init(u16 musb_type, struct musb *musb) 1448 { 1449 u8 reg; 1450 char *type; 1451 char aInfo[90]; 1452 void __iomem *mbase = musb->mregs; 1453 int status = 0; 1454 int i; 1455 1456 /* log core options (read using indexed model) */ 1457 reg = musb_read_configdata(mbase); 1458 1459 strcpy(aInfo, (reg & MUSB_CONFIGDATA_UTMIDW) ? "UTMI-16" : "UTMI-8"); 1460 if (reg & MUSB_CONFIGDATA_DYNFIFO) { 1461 strcat(aInfo, ", dyn FIFOs"); 1462 musb->dyn_fifo = true; 1463 } 1464 if (reg & MUSB_CONFIGDATA_MPRXE) { 1465 strcat(aInfo, ", bulk combine"); 1466 musb->bulk_combine = true; 1467 } 1468 if (reg & MUSB_CONFIGDATA_MPTXE) { 1469 strcat(aInfo, ", bulk split"); 1470 musb->bulk_split = true; 1471 } 1472 if (reg & MUSB_CONFIGDATA_HBRXE) { 1473 strcat(aInfo, ", HB-ISO Rx"); 1474 musb->hb_iso_rx = true; 1475 } 1476 if (reg & MUSB_CONFIGDATA_HBTXE) { 1477 strcat(aInfo, ", HB-ISO Tx"); 1478 musb->hb_iso_tx = true; 1479 } 1480 if (reg & MUSB_CONFIGDATA_SOFTCONE) 1481 strcat(aInfo, ", SoftConn"); 1482 1483 pr_debug("%s: ConfigData=0x%02x (%s)\n", musb_driver_name, reg, aInfo); 1484 1485 if (MUSB_CONTROLLER_MHDRC == musb_type) { 1486 musb->is_multipoint = 1; 1487 type = "M"; 1488 } else { 1489 musb->is_multipoint = 0; 1490 type = ""; 1491 #ifndef CONFIG_USB_OTG_BLACKLIST_HUB 1492 pr_err("%s: kernel must blacklist external hubs\n", 1493 musb_driver_name); 1494 #endif 1495 } 1496 1497 /* log release info */ 1498 musb->hwvers = musb_read_hwvers(mbase); 1499 pr_debug("%s: %sHDRC RTL version %d.%d%s\n", 1500 musb_driver_name, type, MUSB_HWVERS_MAJOR(musb->hwvers), 1501 MUSB_HWVERS_MINOR(musb->hwvers), 1502 (musb->hwvers & MUSB_HWVERS_RC) ? "RC" : ""); 1503 1504 /* configure ep0 */ 1505 musb_configure_ep0(musb); 1506 1507 /* discover endpoint configuration */ 1508 musb->nr_endpoints = 1; 1509 musb->epmask = 1; 1510 1511 if (musb->dyn_fifo) 1512 status = ep_config_from_table(musb); 1513 else 1514 status = ep_config_from_hw(musb); 1515 1516 if (status < 0) 1517 return status; 1518 1519 /* finish init, and print endpoint config */ 1520 for (i = 0; i < musb->nr_endpoints; i++) { 1521 struct musb_hw_ep *hw_ep = musb->endpoints + i; 1522 1523 hw_ep->fifo = musb->io.fifo_offset(i) + mbase; 1524 #if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010) 1525 if (musb->io.quirks & MUSB_IN_TUSB) { 1526 hw_ep->fifo_async = musb->async + 0x400 + 1527 musb->io.fifo_offset(i); 1528 hw_ep->fifo_sync = musb->sync + 0x400 + 1529 musb->io.fifo_offset(i); 1530 hw_ep->fifo_sync_va = 1531 musb->sync_va + 0x400 + musb->io.fifo_offset(i); 1532 1533 if (i == 0) 1534 hw_ep->conf = mbase - 0x400 + TUSB_EP0_CONF; 1535 else 1536 hw_ep->conf = mbase + 0x400 + 1537 (((i - 1) & 0xf) << 2); 1538 } 1539 #endif 1540 1541 hw_ep->regs = musb->io.ep_offset(i, 0) + mbase; 1542 hw_ep->rx_reinit = 1; 1543 hw_ep->tx_reinit = 1; 1544 1545 if (hw_ep->max_packet_sz_tx) { 1546 musb_dbg(musb, "%s: hw_ep %d%s, %smax %d", 1547 musb_driver_name, i, 1548 hw_ep->is_shared_fifo ? "shared" : "tx", 1549 hw_ep->tx_double_buffered 1550 ? "doublebuffer, " : "", 1551 hw_ep->max_packet_sz_tx); 1552 } 1553 if (hw_ep->max_packet_sz_rx && !hw_ep->is_shared_fifo) { 1554 musb_dbg(musb, "%s: hw_ep %d%s, %smax %d", 1555 musb_driver_name, i, 1556 "rx", 1557 hw_ep->rx_double_buffered 1558 ? "doublebuffer, " : "", 1559 hw_ep->max_packet_sz_rx); 1560 } 1561 if (!(hw_ep->max_packet_sz_tx || hw_ep->max_packet_sz_rx)) 1562 musb_dbg(musb, "hw_ep %d not configured", i); 1563 } 1564 1565 return 0; 1566 } 1567 1568 /*-------------------------------------------------------------------------*/ 1569 1570 /* 1571 * handle all the irqs defined by the HDRC core. for now we expect: other 1572 * irq sources (phy, dma, etc) will be handled first, musb->int_* values 1573 * will be assigned, and the irq will already have been acked. 1574 * 1575 * called in irq context with spinlock held, irqs blocked 1576 */ 1577 irqreturn_t musb_interrupt(struct musb *musb) 1578 { 1579 irqreturn_t retval = IRQ_NONE; 1580 unsigned long status; 1581 unsigned long epnum; 1582 u8 devctl; 1583 1584 if (!musb->int_usb && !musb->int_tx && !musb->int_rx) 1585 return IRQ_NONE; 1586 1587 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 1588 1589 trace_musb_isr(musb); 1590 1591 /** 1592 * According to Mentor Graphics' documentation, flowchart on page 98, 1593 * IRQ should be handled as follows: 1594 * 1595 * . Resume IRQ 1596 * . Session Request IRQ 1597 * . VBUS Error IRQ 1598 * . Suspend IRQ 1599 * . Connect IRQ 1600 * . Disconnect IRQ 1601 * . Reset/Babble IRQ 1602 * . SOF IRQ (we're not using this one) 1603 * . Endpoint 0 IRQ 1604 * . TX Endpoints 1605 * . RX Endpoints 1606 * 1607 * We will be following that flowchart in order to avoid any problems 1608 * that might arise with internal Finite State Machine. 1609 */ 1610 1611 if (musb->int_usb) 1612 retval |= musb_stage0_irq(musb, musb->int_usb, devctl); 1613 1614 if (musb->int_tx & 1) { 1615 if (is_host_active(musb)) 1616 retval |= musb_h_ep0_irq(musb); 1617 else 1618 retval |= musb_g_ep0_irq(musb); 1619 1620 /* we have just handled endpoint 0 IRQ, clear it */ 1621 musb->int_tx &= ~BIT(0); 1622 } 1623 1624 status = musb->int_tx; 1625 1626 for_each_set_bit(epnum, &status, 16) { 1627 retval = IRQ_HANDLED; 1628 if (is_host_active(musb)) 1629 musb_host_tx(musb, epnum); 1630 else 1631 musb_g_tx(musb, epnum); 1632 } 1633 1634 status = musb->int_rx; 1635 1636 for_each_set_bit(epnum, &status, 16) { 1637 retval = IRQ_HANDLED; 1638 if (is_host_active(musb)) 1639 musb_host_rx(musb, epnum); 1640 else 1641 musb_g_rx(musb, epnum); 1642 } 1643 1644 return retval; 1645 } 1646 EXPORT_SYMBOL_GPL(musb_interrupt); 1647 1648 #ifndef CONFIG_MUSB_PIO_ONLY 1649 static bool use_dma = 1; 1650 1651 /* "modprobe ... use_dma=0" etc */ 1652 module_param(use_dma, bool, 0644); 1653 MODULE_PARM_DESC(use_dma, "enable/disable use of DMA"); 1654 1655 void musb_dma_completion(struct musb *musb, u8 epnum, u8 transmit) 1656 { 1657 /* called with controller lock already held */ 1658 1659 if (!epnum) { 1660 if (!is_cppi_enabled(musb)) { 1661 /* endpoint 0 */ 1662 if (is_host_active(musb)) 1663 musb_h_ep0_irq(musb); 1664 else 1665 musb_g_ep0_irq(musb); 1666 } 1667 } else { 1668 /* endpoints 1..15 */ 1669 if (transmit) { 1670 if (is_host_active(musb)) 1671 musb_host_tx(musb, epnum); 1672 else 1673 musb_g_tx(musb, epnum); 1674 } else { 1675 /* receive */ 1676 if (is_host_active(musb)) 1677 musb_host_rx(musb, epnum); 1678 else 1679 musb_g_rx(musb, epnum); 1680 } 1681 } 1682 } 1683 EXPORT_SYMBOL_GPL(musb_dma_completion); 1684 1685 #else 1686 #define use_dma 0 1687 #endif 1688 1689 static int (*musb_phy_callback)(enum musb_vbus_id_status status); 1690 1691 /* 1692 * musb_mailbox - optional phy notifier function 1693 * @status phy state change 1694 * 1695 * Optionally gets called from the USB PHY. Note that the USB PHY must be 1696 * disabled at the point the phy_callback is registered or unregistered. 1697 */ 1698 int musb_mailbox(enum musb_vbus_id_status status) 1699 { 1700 if (musb_phy_callback) 1701 return musb_phy_callback(status); 1702 1703 return -ENODEV; 1704 }; 1705 EXPORT_SYMBOL_GPL(musb_mailbox); 1706 1707 /*-------------------------------------------------------------------------*/ 1708 1709 static ssize_t 1710 musb_mode_show(struct device *dev, struct device_attribute *attr, char *buf) 1711 { 1712 struct musb *musb = dev_to_musb(dev); 1713 unsigned long flags; 1714 int ret = -EINVAL; 1715 1716 spin_lock_irqsave(&musb->lock, flags); 1717 ret = sprintf(buf, "%s\n", usb_otg_state_string(musb->xceiv->otg->state)); 1718 spin_unlock_irqrestore(&musb->lock, flags); 1719 1720 return ret; 1721 } 1722 1723 static ssize_t 1724 musb_mode_store(struct device *dev, struct device_attribute *attr, 1725 const char *buf, size_t n) 1726 { 1727 struct musb *musb = dev_to_musb(dev); 1728 unsigned long flags; 1729 int status; 1730 1731 spin_lock_irqsave(&musb->lock, flags); 1732 if (sysfs_streq(buf, "host")) 1733 status = musb_platform_set_mode(musb, MUSB_HOST); 1734 else if (sysfs_streq(buf, "peripheral")) 1735 status = musb_platform_set_mode(musb, MUSB_PERIPHERAL); 1736 else if (sysfs_streq(buf, "otg")) 1737 status = musb_platform_set_mode(musb, MUSB_OTG); 1738 else 1739 status = -EINVAL; 1740 spin_unlock_irqrestore(&musb->lock, flags); 1741 1742 return (status == 0) ? n : status; 1743 } 1744 static DEVICE_ATTR(mode, 0644, musb_mode_show, musb_mode_store); 1745 1746 static ssize_t 1747 musb_vbus_store(struct device *dev, struct device_attribute *attr, 1748 const char *buf, size_t n) 1749 { 1750 struct musb *musb = dev_to_musb(dev); 1751 unsigned long flags; 1752 unsigned long val; 1753 1754 if (sscanf(buf, "%lu", &val) < 1) { 1755 dev_err(dev, "Invalid VBUS timeout ms value\n"); 1756 return -EINVAL; 1757 } 1758 1759 spin_lock_irqsave(&musb->lock, flags); 1760 /* force T(a_wait_bcon) to be zero/unlimited *OR* valid */ 1761 musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ; 1762 if (musb->xceiv->otg->state == OTG_STATE_A_WAIT_BCON) 1763 musb->is_active = 0; 1764 musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val)); 1765 spin_unlock_irqrestore(&musb->lock, flags); 1766 1767 return n; 1768 } 1769 1770 static ssize_t 1771 musb_vbus_show(struct device *dev, struct device_attribute *attr, char *buf) 1772 { 1773 struct musb *musb = dev_to_musb(dev); 1774 unsigned long flags; 1775 unsigned long val; 1776 int vbus; 1777 u8 devctl; 1778 1779 spin_lock_irqsave(&musb->lock, flags); 1780 val = musb->a_wait_bcon; 1781 vbus = musb_platform_get_vbus_status(musb); 1782 if (vbus < 0) { 1783 /* Use default MUSB method by means of DEVCTL register */ 1784 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 1785 if ((devctl & MUSB_DEVCTL_VBUS) 1786 == (3 << MUSB_DEVCTL_VBUS_SHIFT)) 1787 vbus = 1; 1788 else 1789 vbus = 0; 1790 } 1791 spin_unlock_irqrestore(&musb->lock, flags); 1792 1793 return sprintf(buf, "Vbus %s, timeout %lu msec\n", 1794 vbus ? "on" : "off", val); 1795 } 1796 static DEVICE_ATTR(vbus, 0644, musb_vbus_show, musb_vbus_store); 1797 1798 /* Gadget drivers can't know that a host is connected so they might want 1799 * to start SRP, but users can. This allows userspace to trigger SRP. 1800 */ 1801 static ssize_t 1802 musb_srp_store(struct device *dev, struct device_attribute *attr, 1803 const char *buf, size_t n) 1804 { 1805 struct musb *musb = dev_to_musb(dev); 1806 unsigned short srp; 1807 1808 if (sscanf(buf, "%hu", &srp) != 1 1809 || (srp != 1)) { 1810 dev_err(dev, "SRP: Value must be 1\n"); 1811 return -EINVAL; 1812 } 1813 1814 if (srp == 1) 1815 musb_g_wakeup(musb); 1816 1817 return n; 1818 } 1819 static DEVICE_ATTR(srp, 0644, NULL, musb_srp_store); 1820 1821 static struct attribute *musb_attributes[] = { 1822 &dev_attr_mode.attr, 1823 &dev_attr_vbus.attr, 1824 &dev_attr_srp.attr, 1825 NULL 1826 }; 1827 1828 static const struct attribute_group musb_attr_group = { 1829 .attrs = musb_attributes, 1830 }; 1831 1832 #define MUSB_QUIRK_B_INVALID_VBUS_91 (MUSB_DEVCTL_BDEVICE | \ 1833 (2 << MUSB_DEVCTL_VBUS_SHIFT) | \ 1834 MUSB_DEVCTL_SESSION) 1835 #define MUSB_QUIRK_A_DISCONNECT_19 ((3 << MUSB_DEVCTL_VBUS_SHIFT) | \ 1836 MUSB_DEVCTL_SESSION) 1837 1838 /* 1839 * Check the musb devctl session bit to determine if we want to 1840 * allow PM runtime for the device. In general, we want to keep things 1841 * active when the session bit is set except after host disconnect. 1842 * 1843 * Only called from musb_irq_work. If this ever needs to get called 1844 * elsewhere, proper locking must be implemented for musb->session. 1845 */ 1846 static void musb_pm_runtime_check_session(struct musb *musb) 1847 { 1848 u8 devctl, s; 1849 int error; 1850 1851 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 1852 1853 /* Handle session status quirks first */ 1854 s = MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV | 1855 MUSB_DEVCTL_HR; 1856 switch (devctl & ~s) { 1857 case MUSB_QUIRK_B_INVALID_VBUS_91: 1858 if (!musb->session && !musb->quirk_invalid_vbus) { 1859 musb->quirk_invalid_vbus = true; 1860 musb_dbg(musb, 1861 "First invalid vbus, assume no session"); 1862 return; 1863 } 1864 break; 1865 case MUSB_QUIRK_A_DISCONNECT_19: 1866 if (!musb->session) 1867 break; 1868 musb_dbg(musb, "Allow PM on possible host mode disconnect"); 1869 pm_runtime_mark_last_busy(musb->controller); 1870 pm_runtime_put_autosuspend(musb->controller); 1871 musb->session = false; 1872 return; 1873 default: 1874 break; 1875 } 1876 1877 /* No need to do anything if session has not changed */ 1878 s = devctl & MUSB_DEVCTL_SESSION; 1879 if (s == musb->session) 1880 return; 1881 1882 /* Block PM or allow PM? */ 1883 if (s) { 1884 musb_dbg(musb, "Block PM on active session: %02x", devctl); 1885 error = pm_runtime_get_sync(musb->controller); 1886 if (error < 0) 1887 dev_err(musb->controller, "Could not enable: %i\n", 1888 error); 1889 } else { 1890 musb_dbg(musb, "Allow PM with no session: %02x", devctl); 1891 musb->quirk_invalid_vbus = false; 1892 pm_runtime_mark_last_busy(musb->controller); 1893 pm_runtime_put_autosuspend(musb->controller); 1894 } 1895 1896 musb->session = s; 1897 } 1898 1899 /* Only used to provide driver mode change events */ 1900 static void musb_irq_work(struct work_struct *data) 1901 { 1902 struct musb *musb = container_of(data, struct musb, irq_work); 1903 1904 musb_pm_runtime_check_session(musb); 1905 1906 if (musb->xceiv->otg->state != musb->xceiv_old_state) { 1907 musb->xceiv_old_state = musb->xceiv->otg->state; 1908 sysfs_notify(&musb->controller->kobj, NULL, "mode"); 1909 } 1910 } 1911 1912 static void musb_recover_from_babble(struct musb *musb) 1913 { 1914 int ret; 1915 u8 devctl; 1916 1917 musb_disable_interrupts(musb); 1918 1919 /* 1920 * wait at least 320 cycles of 60MHz clock. That's 5.3us, we will give 1921 * it some slack and wait for 10us. 1922 */ 1923 udelay(10); 1924 1925 ret = musb_platform_recover(musb); 1926 if (ret) { 1927 musb_enable_interrupts(musb); 1928 return; 1929 } 1930 1931 /* drop session bit */ 1932 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 1933 devctl &= ~MUSB_DEVCTL_SESSION; 1934 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 1935 1936 /* tell usbcore about it */ 1937 musb_root_disconnect(musb); 1938 1939 /* 1940 * When a babble condition occurs, the musb controller 1941 * removes the session bit and the endpoint config is lost. 1942 */ 1943 if (musb->dyn_fifo) 1944 ret = ep_config_from_table(musb); 1945 else 1946 ret = ep_config_from_hw(musb); 1947 1948 /* restart session */ 1949 if (ret == 0) 1950 musb_start(musb); 1951 } 1952 1953 /* -------------------------------------------------------------------------- 1954 * Init support 1955 */ 1956 1957 static struct musb *allocate_instance(struct device *dev, 1958 const struct musb_hdrc_config *config, void __iomem *mbase) 1959 { 1960 struct musb *musb; 1961 struct musb_hw_ep *ep; 1962 int epnum; 1963 int ret; 1964 1965 musb = devm_kzalloc(dev, sizeof(*musb), GFP_KERNEL); 1966 if (!musb) 1967 return NULL; 1968 1969 INIT_LIST_HEAD(&musb->control); 1970 INIT_LIST_HEAD(&musb->in_bulk); 1971 INIT_LIST_HEAD(&musb->out_bulk); 1972 1973 musb->vbuserr_retry = VBUSERR_RETRY_COUNT; 1974 musb->a_wait_bcon = OTG_TIME_A_WAIT_BCON; 1975 musb->mregs = mbase; 1976 musb->ctrl_base = mbase; 1977 musb->nIrq = -ENODEV; 1978 musb->config = config; 1979 BUG_ON(musb->config->num_eps > MUSB_C_NUM_EPS); 1980 for (epnum = 0, ep = musb->endpoints; 1981 epnum < musb->config->num_eps; 1982 epnum++, ep++) { 1983 ep->musb = musb; 1984 ep->epnum = epnum; 1985 } 1986 1987 musb->controller = dev; 1988 1989 ret = musb_host_alloc(musb); 1990 if (ret < 0) 1991 goto err_free; 1992 1993 dev_set_drvdata(dev, musb); 1994 1995 return musb; 1996 1997 err_free: 1998 return NULL; 1999 } 2000 2001 static void musb_free(struct musb *musb) 2002 { 2003 /* this has multiple entry modes. it handles fault cleanup after 2004 * probe(), where things may be partially set up, as well as rmmod 2005 * cleanup after everything's been de-activated. 2006 */ 2007 2008 #ifdef CONFIG_SYSFS 2009 sysfs_remove_group(&musb->controller->kobj, &musb_attr_group); 2010 #endif 2011 2012 if (musb->nIrq >= 0) { 2013 if (musb->irq_wake) 2014 disable_irq_wake(musb->nIrq); 2015 free_irq(musb->nIrq, musb); 2016 } 2017 2018 musb_host_free(musb); 2019 } 2020 2021 static void musb_deassert_reset(struct work_struct *work) 2022 { 2023 struct musb *musb; 2024 unsigned long flags; 2025 2026 musb = container_of(work, struct musb, deassert_reset_work.work); 2027 2028 spin_lock_irqsave(&musb->lock, flags); 2029 2030 if (musb->port1_status & USB_PORT_STAT_RESET) 2031 musb_port_reset(musb, false); 2032 2033 spin_unlock_irqrestore(&musb->lock, flags); 2034 } 2035 2036 /* 2037 * Perform generic per-controller initialization. 2038 * 2039 * @dev: the controller (already clocked, etc) 2040 * @nIrq: IRQ number 2041 * @ctrl: virtual address of controller registers, 2042 * not yet corrected for platform-specific offsets 2043 */ 2044 static int 2045 musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl) 2046 { 2047 int status; 2048 struct musb *musb; 2049 struct musb_hdrc_platform_data *plat = dev_get_platdata(dev); 2050 2051 /* The driver might handle more features than the board; OK. 2052 * Fail when the board needs a feature that's not enabled. 2053 */ 2054 if (!plat) { 2055 dev_err(dev, "no platform_data?\n"); 2056 status = -ENODEV; 2057 goto fail0; 2058 } 2059 2060 /* allocate */ 2061 musb = allocate_instance(dev, plat->config, ctrl); 2062 if (!musb) { 2063 status = -ENOMEM; 2064 goto fail0; 2065 } 2066 2067 spin_lock_init(&musb->lock); 2068 musb->board_set_power = plat->set_power; 2069 musb->min_power = plat->min_power; 2070 musb->ops = plat->platform_ops; 2071 musb->port_mode = plat->mode; 2072 2073 /* 2074 * Initialize the default IO functions. At least omap2430 needs 2075 * these early. We initialize the platform specific IO functions 2076 * later on. 2077 */ 2078 musb_readb = musb_default_readb; 2079 musb_writeb = musb_default_writeb; 2080 musb_readw = musb_default_readw; 2081 musb_writew = musb_default_writew; 2082 musb_readl = musb_default_readl; 2083 musb_writel = musb_default_writel; 2084 2085 /* The musb_platform_init() call: 2086 * - adjusts musb->mregs 2087 * - sets the musb->isr 2088 * - may initialize an integrated transceiver 2089 * - initializes musb->xceiv, usually by otg_get_phy() 2090 * - stops powering VBUS 2091 * 2092 * There are various transceiver configurations. Blackfin, 2093 * DaVinci, TUSB60x0, and others integrate them. OMAP3 uses 2094 * external/discrete ones in various flavors (twl4030 family, 2095 * isp1504, non-OTG, etc) mostly hooking up through ULPI. 2096 */ 2097 status = musb_platform_init(musb); 2098 if (status < 0) 2099 goto fail1; 2100 2101 if (!musb->isr) { 2102 status = -ENODEV; 2103 goto fail2; 2104 } 2105 2106 if (musb->ops->quirks) 2107 musb->io.quirks = musb->ops->quirks; 2108 2109 /* Most devices use indexed offset or flat offset */ 2110 if (musb->io.quirks & MUSB_INDEXED_EP) { 2111 musb->io.ep_offset = musb_indexed_ep_offset; 2112 musb->io.ep_select = musb_indexed_ep_select; 2113 } else { 2114 musb->io.ep_offset = musb_flat_ep_offset; 2115 musb->io.ep_select = musb_flat_ep_select; 2116 } 2117 2118 /* At least tusb6010 has its own offsets */ 2119 if (musb->ops->ep_offset) 2120 musb->io.ep_offset = musb->ops->ep_offset; 2121 if (musb->ops->ep_select) 2122 musb->io.ep_select = musb->ops->ep_select; 2123 2124 if (musb->ops->fifo_mode) 2125 fifo_mode = musb->ops->fifo_mode; 2126 else 2127 fifo_mode = 4; 2128 2129 if (musb->ops->fifo_offset) 2130 musb->io.fifo_offset = musb->ops->fifo_offset; 2131 else 2132 musb->io.fifo_offset = musb_default_fifo_offset; 2133 2134 if (musb->ops->busctl_offset) 2135 musb->io.busctl_offset = musb->ops->busctl_offset; 2136 else 2137 musb->io.busctl_offset = musb_default_busctl_offset; 2138 2139 if (musb->ops->readb) 2140 musb_readb = musb->ops->readb; 2141 if (musb->ops->writeb) 2142 musb_writeb = musb->ops->writeb; 2143 if (musb->ops->readw) 2144 musb_readw = musb->ops->readw; 2145 if (musb->ops->writew) 2146 musb_writew = musb->ops->writew; 2147 if (musb->ops->readl) 2148 musb_readl = musb->ops->readl; 2149 if (musb->ops->writel) 2150 musb_writel = musb->ops->writel; 2151 2152 #ifndef CONFIG_MUSB_PIO_ONLY 2153 if (!musb->ops->dma_init || !musb->ops->dma_exit) { 2154 dev_err(dev, "DMA controller not set\n"); 2155 status = -ENODEV; 2156 goto fail2; 2157 } 2158 musb_dma_controller_create = musb->ops->dma_init; 2159 musb_dma_controller_destroy = musb->ops->dma_exit; 2160 #endif 2161 2162 if (musb->ops->read_fifo) 2163 musb->io.read_fifo = musb->ops->read_fifo; 2164 else 2165 musb->io.read_fifo = musb_default_read_fifo; 2166 2167 if (musb->ops->write_fifo) 2168 musb->io.write_fifo = musb->ops->write_fifo; 2169 else 2170 musb->io.write_fifo = musb_default_write_fifo; 2171 2172 if (!musb->xceiv->io_ops) { 2173 musb->xceiv->io_dev = musb->controller; 2174 musb->xceiv->io_priv = musb->mregs; 2175 musb->xceiv->io_ops = &musb_ulpi_access; 2176 } 2177 2178 if (musb->ops->phy_callback) 2179 musb_phy_callback = musb->ops->phy_callback; 2180 2181 /* 2182 * We need musb_read/write functions initialized for PM. 2183 * Note that at least 2430 glue needs autosuspend delay 2184 * somewhere above 300 ms for the hardware to idle properly 2185 * after disconnecting the cable in host mode. Let's use 2186 * 500 ms for some margin. 2187 */ 2188 pm_runtime_use_autosuspend(musb->controller); 2189 pm_runtime_set_autosuspend_delay(musb->controller, 500); 2190 pm_runtime_enable(musb->controller); 2191 pm_runtime_get_sync(musb->controller); 2192 2193 status = usb_phy_init(musb->xceiv); 2194 if (status < 0) 2195 goto err_usb_phy_init; 2196 2197 if (use_dma && dev->dma_mask) { 2198 musb->dma_controller = 2199 musb_dma_controller_create(musb, musb->mregs); 2200 if (IS_ERR(musb->dma_controller)) { 2201 status = PTR_ERR(musb->dma_controller); 2202 goto fail2_5; 2203 } 2204 } 2205 2206 /* be sure interrupts are disabled before connecting ISR */ 2207 musb_platform_disable(musb); 2208 musb_generic_disable(musb); 2209 2210 /* Init IRQ workqueue before request_irq */ 2211 INIT_WORK(&musb->irq_work, musb_irq_work); 2212 INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset); 2213 INIT_DELAYED_WORK(&musb->finish_resume_work, musb_host_finish_resume); 2214 2215 /* setup musb parts of the core (especially endpoints) */ 2216 status = musb_core_init(plat->config->multipoint 2217 ? MUSB_CONTROLLER_MHDRC 2218 : MUSB_CONTROLLER_HDRC, musb); 2219 if (status < 0) 2220 goto fail3; 2221 2222 setup_timer(&musb->otg_timer, musb_otg_timer_func, (unsigned long) musb); 2223 2224 /* attach to the IRQ */ 2225 if (request_irq(nIrq, musb->isr, 0, dev_name(dev), musb)) { 2226 dev_err(dev, "request_irq %d failed!\n", nIrq); 2227 status = -ENODEV; 2228 goto fail3; 2229 } 2230 musb->nIrq = nIrq; 2231 /* FIXME this handles wakeup irqs wrong */ 2232 if (enable_irq_wake(nIrq) == 0) { 2233 musb->irq_wake = 1; 2234 device_init_wakeup(dev, 1); 2235 } else { 2236 musb->irq_wake = 0; 2237 } 2238 2239 /* program PHY to use external vBus if required */ 2240 if (plat->extvbus) { 2241 u8 busctl = musb_read_ulpi_buscontrol(musb->mregs); 2242 busctl |= MUSB_ULPI_USE_EXTVBUS; 2243 musb_write_ulpi_buscontrol(musb->mregs, busctl); 2244 } 2245 2246 if (musb->xceiv->otg->default_a) { 2247 MUSB_HST_MODE(musb); 2248 musb->xceiv->otg->state = OTG_STATE_A_IDLE; 2249 } else { 2250 MUSB_DEV_MODE(musb); 2251 musb->xceiv->otg->state = OTG_STATE_B_IDLE; 2252 } 2253 2254 switch (musb->port_mode) { 2255 case MUSB_PORT_MODE_HOST: 2256 status = musb_host_setup(musb, plat->power); 2257 if (status < 0) 2258 goto fail3; 2259 status = musb_platform_set_mode(musb, MUSB_HOST); 2260 break; 2261 case MUSB_PORT_MODE_GADGET: 2262 status = musb_gadget_setup(musb); 2263 if (status < 0) 2264 goto fail3; 2265 status = musb_platform_set_mode(musb, MUSB_PERIPHERAL); 2266 break; 2267 case MUSB_PORT_MODE_DUAL_ROLE: 2268 status = musb_host_setup(musb, plat->power); 2269 if (status < 0) 2270 goto fail3; 2271 status = musb_gadget_setup(musb); 2272 if (status) { 2273 musb_host_cleanup(musb); 2274 goto fail3; 2275 } 2276 status = musb_platform_set_mode(musb, MUSB_OTG); 2277 break; 2278 default: 2279 dev_err(dev, "unsupported port mode %d\n", musb->port_mode); 2280 break; 2281 } 2282 2283 if (status < 0) 2284 goto fail3; 2285 2286 status = musb_init_debugfs(musb); 2287 if (status < 0) 2288 goto fail4; 2289 2290 status = sysfs_create_group(&musb->controller->kobj, &musb_attr_group); 2291 if (status) 2292 goto fail5; 2293 2294 pm_runtime_mark_last_busy(musb->controller); 2295 pm_runtime_put_autosuspend(musb->controller); 2296 2297 return 0; 2298 2299 fail5: 2300 musb_exit_debugfs(musb); 2301 2302 fail4: 2303 musb_gadget_cleanup(musb); 2304 musb_host_cleanup(musb); 2305 2306 fail3: 2307 cancel_work_sync(&musb->irq_work); 2308 cancel_delayed_work_sync(&musb->finish_resume_work); 2309 cancel_delayed_work_sync(&musb->deassert_reset_work); 2310 if (musb->dma_controller) 2311 musb_dma_controller_destroy(musb->dma_controller); 2312 2313 fail2_5: 2314 usb_phy_shutdown(musb->xceiv); 2315 2316 err_usb_phy_init: 2317 pm_runtime_dont_use_autosuspend(musb->controller); 2318 pm_runtime_put_sync(musb->controller); 2319 pm_runtime_disable(musb->controller); 2320 2321 fail2: 2322 if (musb->irq_wake) 2323 device_init_wakeup(dev, 0); 2324 musb_platform_exit(musb); 2325 2326 fail1: 2327 dev_err(musb->controller, 2328 "musb_init_controller failed with status %d\n", status); 2329 2330 musb_free(musb); 2331 2332 fail0: 2333 2334 return status; 2335 2336 } 2337 2338 /*-------------------------------------------------------------------------*/ 2339 2340 /* all implementations (PCI bridge to FPGA, VLYNQ, etc) should just 2341 * bridge to a platform device; this driver then suffices. 2342 */ 2343 static int musb_probe(struct platform_device *pdev) 2344 { 2345 struct device *dev = &pdev->dev; 2346 int irq = platform_get_irq_byname(pdev, "mc"); 2347 struct resource *iomem; 2348 void __iomem *base; 2349 2350 if (irq <= 0) 2351 return -ENODEV; 2352 2353 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 2354 base = devm_ioremap_resource(dev, iomem); 2355 if (IS_ERR(base)) 2356 return PTR_ERR(base); 2357 2358 return musb_init_controller(dev, irq, base); 2359 } 2360 2361 static int musb_remove(struct platform_device *pdev) 2362 { 2363 struct device *dev = &pdev->dev; 2364 struct musb *musb = dev_to_musb(dev); 2365 unsigned long flags; 2366 2367 /* this gets called on rmmod. 2368 * - Host mode: host may still be active 2369 * - Peripheral mode: peripheral is deactivated (or never-activated) 2370 * - OTG mode: both roles are deactivated (or never-activated) 2371 */ 2372 musb_exit_debugfs(musb); 2373 2374 cancel_work_sync(&musb->irq_work); 2375 cancel_delayed_work_sync(&musb->finish_resume_work); 2376 cancel_delayed_work_sync(&musb->deassert_reset_work); 2377 pm_runtime_get_sync(musb->controller); 2378 musb_host_cleanup(musb); 2379 musb_gadget_cleanup(musb); 2380 spin_lock_irqsave(&musb->lock, flags); 2381 musb_platform_disable(musb); 2382 musb_generic_disable(musb); 2383 spin_unlock_irqrestore(&musb->lock, flags); 2384 musb_writeb(musb->mregs, MUSB_DEVCTL, 0); 2385 pm_runtime_dont_use_autosuspend(musb->controller); 2386 pm_runtime_put_sync(musb->controller); 2387 pm_runtime_disable(musb->controller); 2388 musb_platform_exit(musb); 2389 musb_phy_callback = NULL; 2390 if (musb->dma_controller) 2391 musb_dma_controller_destroy(musb->dma_controller); 2392 usb_phy_shutdown(musb->xceiv); 2393 musb_free(musb); 2394 device_init_wakeup(dev, 0); 2395 return 0; 2396 } 2397 2398 #ifdef CONFIG_PM 2399 2400 static void musb_save_context(struct musb *musb) 2401 { 2402 int i; 2403 void __iomem *musb_base = musb->mregs; 2404 void __iomem *epio; 2405 2406 musb->context.frame = musb_readw(musb_base, MUSB_FRAME); 2407 musb->context.testmode = musb_readb(musb_base, MUSB_TESTMODE); 2408 musb->context.busctl = musb_read_ulpi_buscontrol(musb->mregs); 2409 musb->context.power = musb_readb(musb_base, MUSB_POWER); 2410 musb->context.intrusbe = musb_readb(musb_base, MUSB_INTRUSBE); 2411 musb->context.index = musb_readb(musb_base, MUSB_INDEX); 2412 musb->context.devctl = musb_readb(musb_base, MUSB_DEVCTL); 2413 2414 for (i = 0; i < musb->config->num_eps; ++i) { 2415 struct musb_hw_ep *hw_ep; 2416 2417 hw_ep = &musb->endpoints[i]; 2418 if (!hw_ep) 2419 continue; 2420 2421 epio = hw_ep->regs; 2422 if (!epio) 2423 continue; 2424 2425 musb_writeb(musb_base, MUSB_INDEX, i); 2426 musb->context.index_regs[i].txmaxp = 2427 musb_readw(epio, MUSB_TXMAXP); 2428 musb->context.index_regs[i].txcsr = 2429 musb_readw(epio, MUSB_TXCSR); 2430 musb->context.index_regs[i].rxmaxp = 2431 musb_readw(epio, MUSB_RXMAXP); 2432 musb->context.index_regs[i].rxcsr = 2433 musb_readw(epio, MUSB_RXCSR); 2434 2435 if (musb->dyn_fifo) { 2436 musb->context.index_regs[i].txfifoadd = 2437 musb_read_txfifoadd(musb_base); 2438 musb->context.index_regs[i].rxfifoadd = 2439 musb_read_rxfifoadd(musb_base); 2440 musb->context.index_regs[i].txfifosz = 2441 musb_read_txfifosz(musb_base); 2442 musb->context.index_regs[i].rxfifosz = 2443 musb_read_rxfifosz(musb_base); 2444 } 2445 2446 musb->context.index_regs[i].txtype = 2447 musb_readb(epio, MUSB_TXTYPE); 2448 musb->context.index_regs[i].txinterval = 2449 musb_readb(epio, MUSB_TXINTERVAL); 2450 musb->context.index_regs[i].rxtype = 2451 musb_readb(epio, MUSB_RXTYPE); 2452 musb->context.index_regs[i].rxinterval = 2453 musb_readb(epio, MUSB_RXINTERVAL); 2454 2455 musb->context.index_regs[i].txfunaddr = 2456 musb_read_txfunaddr(musb, i); 2457 musb->context.index_regs[i].txhubaddr = 2458 musb_read_txhubaddr(musb, i); 2459 musb->context.index_regs[i].txhubport = 2460 musb_read_txhubport(musb, i); 2461 2462 musb->context.index_regs[i].rxfunaddr = 2463 musb_read_rxfunaddr(musb, i); 2464 musb->context.index_regs[i].rxhubaddr = 2465 musb_read_rxhubaddr(musb, i); 2466 musb->context.index_regs[i].rxhubport = 2467 musb_read_rxhubport(musb, i); 2468 } 2469 } 2470 2471 static void musb_restore_context(struct musb *musb) 2472 { 2473 int i; 2474 void __iomem *musb_base = musb->mregs; 2475 void __iomem *epio; 2476 u8 power; 2477 2478 musb_writew(musb_base, MUSB_FRAME, musb->context.frame); 2479 musb_writeb(musb_base, MUSB_TESTMODE, musb->context.testmode); 2480 musb_write_ulpi_buscontrol(musb->mregs, musb->context.busctl); 2481 2482 /* Don't affect SUSPENDM/RESUME bits in POWER reg */ 2483 power = musb_readb(musb_base, MUSB_POWER); 2484 power &= MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME; 2485 musb->context.power &= ~(MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME); 2486 power |= musb->context.power; 2487 musb_writeb(musb_base, MUSB_POWER, power); 2488 2489 musb_writew(musb_base, MUSB_INTRTXE, musb->intrtxe); 2490 musb_writew(musb_base, MUSB_INTRRXE, musb->intrrxe); 2491 musb_writeb(musb_base, MUSB_INTRUSBE, musb->context.intrusbe); 2492 if (musb->context.devctl & MUSB_DEVCTL_SESSION) 2493 musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl); 2494 2495 for (i = 0; i < musb->config->num_eps; ++i) { 2496 struct musb_hw_ep *hw_ep; 2497 2498 hw_ep = &musb->endpoints[i]; 2499 if (!hw_ep) 2500 continue; 2501 2502 epio = hw_ep->regs; 2503 if (!epio) 2504 continue; 2505 2506 musb_writeb(musb_base, MUSB_INDEX, i); 2507 musb_writew(epio, MUSB_TXMAXP, 2508 musb->context.index_regs[i].txmaxp); 2509 musb_writew(epio, MUSB_TXCSR, 2510 musb->context.index_regs[i].txcsr); 2511 musb_writew(epio, MUSB_RXMAXP, 2512 musb->context.index_regs[i].rxmaxp); 2513 musb_writew(epio, MUSB_RXCSR, 2514 musb->context.index_regs[i].rxcsr); 2515 2516 if (musb->dyn_fifo) { 2517 musb_write_txfifosz(musb_base, 2518 musb->context.index_regs[i].txfifosz); 2519 musb_write_rxfifosz(musb_base, 2520 musb->context.index_regs[i].rxfifosz); 2521 musb_write_txfifoadd(musb_base, 2522 musb->context.index_regs[i].txfifoadd); 2523 musb_write_rxfifoadd(musb_base, 2524 musb->context.index_regs[i].rxfifoadd); 2525 } 2526 2527 musb_writeb(epio, MUSB_TXTYPE, 2528 musb->context.index_regs[i].txtype); 2529 musb_writeb(epio, MUSB_TXINTERVAL, 2530 musb->context.index_regs[i].txinterval); 2531 musb_writeb(epio, MUSB_RXTYPE, 2532 musb->context.index_regs[i].rxtype); 2533 musb_writeb(epio, MUSB_RXINTERVAL, 2534 2535 musb->context.index_regs[i].rxinterval); 2536 musb_write_txfunaddr(musb, i, 2537 musb->context.index_regs[i].txfunaddr); 2538 musb_write_txhubaddr(musb, i, 2539 musb->context.index_regs[i].txhubaddr); 2540 musb_write_txhubport(musb, i, 2541 musb->context.index_regs[i].txhubport); 2542 2543 musb_write_rxfunaddr(musb, i, 2544 musb->context.index_regs[i].rxfunaddr); 2545 musb_write_rxhubaddr(musb, i, 2546 musb->context.index_regs[i].rxhubaddr); 2547 musb_write_rxhubport(musb, i, 2548 musb->context.index_regs[i].rxhubport); 2549 } 2550 musb_writeb(musb_base, MUSB_INDEX, musb->context.index); 2551 } 2552 2553 static int musb_suspend(struct device *dev) 2554 { 2555 struct musb *musb = dev_to_musb(dev); 2556 unsigned long flags; 2557 2558 musb_platform_disable(musb); 2559 musb_generic_disable(musb); 2560 2561 spin_lock_irqsave(&musb->lock, flags); 2562 2563 if (is_peripheral_active(musb)) { 2564 /* FIXME force disconnect unless we know USB will wake 2565 * the system up quickly enough to respond ... 2566 */ 2567 } else if (is_host_active(musb)) { 2568 /* we know all the children are suspended; sometimes 2569 * they will even be wakeup-enabled. 2570 */ 2571 } 2572 2573 musb_save_context(musb); 2574 2575 spin_unlock_irqrestore(&musb->lock, flags); 2576 return 0; 2577 } 2578 2579 static int musb_resume(struct device *dev) 2580 { 2581 struct musb *musb = dev_to_musb(dev); 2582 u8 devctl; 2583 u8 mask; 2584 2585 /* 2586 * For static cmos like DaVinci, register values were preserved 2587 * unless for some reason the whole soc powered down or the USB 2588 * module got reset through the PSC (vs just being disabled). 2589 * 2590 * For the DSPS glue layer though, a full register restore has to 2591 * be done. As it shouldn't harm other platforms, we do it 2592 * unconditionally. 2593 */ 2594 2595 musb_restore_context(musb); 2596 2597 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 2598 mask = MUSB_DEVCTL_BDEVICE | MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV; 2599 if ((devctl & mask) != (musb->context.devctl & mask)) 2600 musb->port1_status = 0; 2601 if (musb->need_finish_resume) { 2602 musb->need_finish_resume = 0; 2603 schedule_delayed_work(&musb->finish_resume_work, 2604 msecs_to_jiffies(USB_RESUME_TIMEOUT)); 2605 } 2606 2607 /* 2608 * The USB HUB code expects the device to be in RPM_ACTIVE once it came 2609 * out of suspend 2610 */ 2611 pm_runtime_disable(dev); 2612 pm_runtime_set_active(dev); 2613 pm_runtime_enable(dev); 2614 2615 musb_start(musb); 2616 2617 return 0; 2618 } 2619 2620 static int musb_runtime_suspend(struct device *dev) 2621 { 2622 struct musb *musb = dev_to_musb(dev); 2623 2624 musb_save_context(musb); 2625 2626 return 0; 2627 } 2628 2629 static int musb_runtime_resume(struct device *dev) 2630 { 2631 struct musb *musb = dev_to_musb(dev); 2632 static int first = 1; 2633 2634 /* 2635 * When pm_runtime_get_sync called for the first time in driver 2636 * init, some of the structure is still not initialized which is 2637 * used in restore function. But clock needs to be 2638 * enabled before any register access, so 2639 * pm_runtime_get_sync has to be called. 2640 * Also context restore without save does not make 2641 * any sense 2642 */ 2643 if (!first) 2644 musb_restore_context(musb); 2645 first = 0; 2646 2647 if (musb->need_finish_resume) { 2648 musb->need_finish_resume = 0; 2649 schedule_delayed_work(&musb->finish_resume_work, 2650 msecs_to_jiffies(USB_RESUME_TIMEOUT)); 2651 } 2652 2653 return 0; 2654 } 2655 2656 static const struct dev_pm_ops musb_dev_pm_ops = { 2657 .suspend = musb_suspend, 2658 .resume = musb_resume, 2659 .runtime_suspend = musb_runtime_suspend, 2660 .runtime_resume = musb_runtime_resume, 2661 }; 2662 2663 #define MUSB_DEV_PM_OPS (&musb_dev_pm_ops) 2664 #else 2665 #define MUSB_DEV_PM_OPS NULL 2666 #endif 2667 2668 static struct platform_driver musb_driver = { 2669 .driver = { 2670 .name = (char *)musb_driver_name, 2671 .bus = &platform_bus_type, 2672 .pm = MUSB_DEV_PM_OPS, 2673 }, 2674 .probe = musb_probe, 2675 .remove = musb_remove, 2676 }; 2677 2678 module_platform_driver(musb_driver); 2679