1 /* 2 * Texas Instruments DSPS platforms "glue layer" 3 * 4 * Copyright (C) 2012, by Texas Instruments 5 * 6 * Based on the am35x "glue layer" code. 7 * 8 * This file is part of the Inventra Controller Driver for Linux. 9 * 10 * The Inventra Controller Driver for Linux is free software; you 11 * can redistribute it and/or modify it under the terms of the GNU 12 * General Public License version 2 as published by the Free Software 13 * Foundation. 14 * 15 * The Inventra Controller Driver for Linux is distributed in 16 * the hope that it will be useful, but WITHOUT ANY WARRANTY; 17 * without even the implied warranty of MERCHANTABILITY or 18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 19 * License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with The Inventra Controller Driver for Linux ; if not, 23 * write to the Free Software Foundation, Inc., 59 Temple Place, 24 * Suite 330, Boston, MA 02111-1307 USA 25 * 26 * musb_dsps.c will be a common file for all the TI DSPS platforms 27 * such as dm64x, dm36x, dm35x, da8x, am35x and ti81x. 28 * For now only ti81x is using this and in future davinci.c, am35x.c 29 * da8xx.c would be merged to this file after testing. 30 */ 31 32 #include <linux/io.h> 33 #include <linux/err.h> 34 #include <linux/platform_device.h> 35 #include <linux/dma-mapping.h> 36 #include <linux/pm_runtime.h> 37 #include <linux/module.h> 38 #include <linux/usb/usb_phy_generic.h> 39 #include <linux/platform_data/usb-omap.h> 40 #include <linux/sizes.h> 41 42 #include <linux/of.h> 43 #include <linux/of_device.h> 44 #include <linux/of_address.h> 45 #include <linux/of_irq.h> 46 #include <linux/usb/of.h> 47 48 #include <linux/debugfs.h> 49 50 #include "musb_core.h" 51 52 static const struct of_device_id musb_dsps_of_match[]; 53 54 /** 55 * avoid using musb_readx()/musb_writex() as glue layer should not be 56 * dependent on musb core layer symbols. 57 */ 58 static inline u8 dsps_readb(const void __iomem *addr, unsigned offset) 59 { 60 return __raw_readb(addr + offset); 61 } 62 63 static inline u32 dsps_readl(const void __iomem *addr, unsigned offset) 64 { 65 return __raw_readl(addr + offset); 66 } 67 68 static inline void dsps_writeb(void __iomem *addr, unsigned offset, u8 data) 69 { 70 __raw_writeb(data, addr + offset); 71 } 72 73 static inline void dsps_writel(void __iomem *addr, unsigned offset, u32 data) 74 { 75 __raw_writel(data, addr + offset); 76 } 77 78 /** 79 * DSPS musb wrapper register offset. 80 * FIXME: This should be expanded to have all the wrapper registers from TI DSPS 81 * musb ips. 82 */ 83 struct dsps_musb_wrapper { 84 u16 revision; 85 u16 control; 86 u16 status; 87 u16 epintr_set; 88 u16 epintr_clear; 89 u16 epintr_status; 90 u16 coreintr_set; 91 u16 coreintr_clear; 92 u16 coreintr_status; 93 u16 phy_utmi; 94 u16 mode; 95 u16 tx_mode; 96 u16 rx_mode; 97 98 /* bit positions for control */ 99 unsigned reset:5; 100 101 /* bit positions for interrupt */ 102 unsigned usb_shift:5; 103 u32 usb_mask; 104 u32 usb_bitmap; 105 unsigned drvvbus:5; 106 107 unsigned txep_shift:5; 108 u32 txep_mask; 109 u32 txep_bitmap; 110 111 unsigned rxep_shift:5; 112 u32 rxep_mask; 113 u32 rxep_bitmap; 114 115 /* bit positions for phy_utmi */ 116 unsigned otg_disable:5; 117 118 /* bit positions for mode */ 119 unsigned iddig:5; 120 unsigned iddig_mux:5; 121 /* miscellaneous stuff */ 122 unsigned poll_timeout; 123 }; 124 125 /* 126 * register shadow for suspend 127 */ 128 struct dsps_context { 129 u32 control; 130 u32 epintr; 131 u32 coreintr; 132 u32 phy_utmi; 133 u32 mode; 134 u32 tx_mode; 135 u32 rx_mode; 136 }; 137 138 /** 139 * DSPS glue structure. 140 */ 141 struct dsps_glue { 142 struct device *dev; 143 struct platform_device *musb; /* child musb pdev */ 144 const struct dsps_musb_wrapper *wrp; /* wrapper register offsets */ 145 struct timer_list timer; /* otg_workaround timer */ 146 unsigned long last_timer; /* last timer data for each instance */ 147 bool sw_babble_enabled; 148 149 struct dsps_context context; 150 struct debugfs_regset32 regset; 151 struct dentry *dbgfs_root; 152 }; 153 154 static const struct debugfs_reg32 dsps_musb_regs[] = { 155 { "revision", 0x00 }, 156 { "control", 0x14 }, 157 { "status", 0x18 }, 158 { "eoi", 0x24 }, 159 { "intr0_stat", 0x30 }, 160 { "intr1_stat", 0x34 }, 161 { "intr0_set", 0x38 }, 162 { "intr1_set", 0x3c }, 163 { "txmode", 0x70 }, 164 { "rxmode", 0x74 }, 165 { "autoreq", 0xd0 }, 166 { "srpfixtime", 0xd4 }, 167 { "tdown", 0xd8 }, 168 { "phy_utmi", 0xe0 }, 169 { "mode", 0xe8 }, 170 }; 171 172 static void dsps_musb_try_idle(struct musb *musb, unsigned long timeout) 173 { 174 struct device *dev = musb->controller; 175 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 176 177 if (timeout == 0) 178 timeout = jiffies + msecs_to_jiffies(3); 179 180 /* Never idle if active, or when VBUS timeout is not set as host */ 181 if (musb->is_active || (musb->a_wait_bcon == 0 && 182 musb->xceiv->otg->state == OTG_STATE_A_WAIT_BCON)) { 183 dev_dbg(musb->controller, "%s active, deleting timer\n", 184 usb_otg_state_string(musb->xceiv->otg->state)); 185 del_timer(&glue->timer); 186 glue->last_timer = jiffies; 187 return; 188 } 189 if (musb->port_mode != MUSB_PORT_MODE_DUAL_ROLE) 190 return; 191 192 if (!musb->g.dev.driver) 193 return; 194 195 if (time_after(glue->last_timer, timeout) && 196 timer_pending(&glue->timer)) { 197 dev_dbg(musb->controller, 198 "Longer idle timer already pending, ignoring...\n"); 199 return; 200 } 201 glue->last_timer = timeout; 202 203 dev_dbg(musb->controller, "%s inactive, starting idle timer for %u ms\n", 204 usb_otg_state_string(musb->xceiv->otg->state), 205 jiffies_to_msecs(timeout - jiffies)); 206 mod_timer(&glue->timer, timeout); 207 } 208 209 /** 210 * dsps_musb_enable - enable interrupts 211 */ 212 static void dsps_musb_enable(struct musb *musb) 213 { 214 struct device *dev = musb->controller; 215 struct platform_device *pdev = to_platform_device(dev->parent); 216 struct dsps_glue *glue = platform_get_drvdata(pdev); 217 const struct dsps_musb_wrapper *wrp = glue->wrp; 218 void __iomem *reg_base = musb->ctrl_base; 219 u32 epmask, coremask; 220 221 /* Workaround: setup IRQs through both register sets. */ 222 epmask = ((musb->epmask & wrp->txep_mask) << wrp->txep_shift) | 223 ((musb->epmask & wrp->rxep_mask) << wrp->rxep_shift); 224 coremask = (wrp->usb_bitmap & ~MUSB_INTR_SOF); 225 226 dsps_writel(reg_base, wrp->epintr_set, epmask); 227 dsps_writel(reg_base, wrp->coreintr_set, coremask); 228 /* start polling for ID change. */ 229 mod_timer(&glue->timer, jiffies + msecs_to_jiffies(wrp->poll_timeout)); 230 dsps_musb_try_idle(musb, 0); 231 } 232 233 /** 234 * dsps_musb_disable - disable HDRC and flush interrupts 235 */ 236 static void dsps_musb_disable(struct musb *musb) 237 { 238 struct device *dev = musb->controller; 239 struct platform_device *pdev = to_platform_device(dev->parent); 240 struct dsps_glue *glue = platform_get_drvdata(pdev); 241 const struct dsps_musb_wrapper *wrp = glue->wrp; 242 void __iomem *reg_base = musb->ctrl_base; 243 244 dsps_writel(reg_base, wrp->coreintr_clear, wrp->usb_bitmap); 245 dsps_writel(reg_base, wrp->epintr_clear, 246 wrp->txep_bitmap | wrp->rxep_bitmap); 247 dsps_writeb(musb->mregs, MUSB_DEVCTL, 0); 248 } 249 250 static void otg_timer(unsigned long _musb) 251 { 252 struct musb *musb = (void *)_musb; 253 void __iomem *mregs = musb->mregs; 254 struct device *dev = musb->controller; 255 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 256 const struct dsps_musb_wrapper *wrp = glue->wrp; 257 u8 devctl; 258 unsigned long flags; 259 int skip_session = 0; 260 261 /* 262 * We poll because DSPS IP's won't expose several OTG-critical 263 * status change events (from the transceiver) otherwise. 264 */ 265 devctl = dsps_readb(mregs, MUSB_DEVCTL); 266 dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl, 267 usb_otg_state_string(musb->xceiv->otg->state)); 268 269 spin_lock_irqsave(&musb->lock, flags); 270 switch (musb->xceiv->otg->state) { 271 case OTG_STATE_A_WAIT_BCON: 272 dsps_writeb(musb->mregs, MUSB_DEVCTL, 0); 273 skip_session = 1; 274 /* fall */ 275 276 case OTG_STATE_A_IDLE: 277 case OTG_STATE_B_IDLE: 278 if (devctl & MUSB_DEVCTL_BDEVICE) { 279 musb->xceiv->otg->state = OTG_STATE_B_IDLE; 280 MUSB_DEV_MODE(musb); 281 } else { 282 musb->xceiv->otg->state = OTG_STATE_A_IDLE; 283 MUSB_HST_MODE(musb); 284 } 285 if (!(devctl & MUSB_DEVCTL_SESSION) && !skip_session) 286 dsps_writeb(mregs, MUSB_DEVCTL, MUSB_DEVCTL_SESSION); 287 mod_timer(&glue->timer, jiffies + 288 msecs_to_jiffies(wrp->poll_timeout)); 289 break; 290 case OTG_STATE_A_WAIT_VFALL: 291 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; 292 dsps_writel(musb->ctrl_base, wrp->coreintr_set, 293 MUSB_INTR_VBUSERROR << wrp->usb_shift); 294 break; 295 default: 296 break; 297 } 298 spin_unlock_irqrestore(&musb->lock, flags); 299 } 300 301 static irqreturn_t dsps_interrupt(int irq, void *hci) 302 { 303 struct musb *musb = hci; 304 void __iomem *reg_base = musb->ctrl_base; 305 struct device *dev = musb->controller; 306 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 307 const struct dsps_musb_wrapper *wrp = glue->wrp; 308 unsigned long flags; 309 irqreturn_t ret = IRQ_NONE; 310 u32 epintr, usbintr; 311 312 spin_lock_irqsave(&musb->lock, flags); 313 314 /* Get endpoint interrupts */ 315 epintr = dsps_readl(reg_base, wrp->epintr_status); 316 musb->int_rx = (epintr & wrp->rxep_bitmap) >> wrp->rxep_shift; 317 musb->int_tx = (epintr & wrp->txep_bitmap) >> wrp->txep_shift; 318 319 if (epintr) 320 dsps_writel(reg_base, wrp->epintr_status, epintr); 321 322 /* Get usb core interrupts */ 323 usbintr = dsps_readl(reg_base, wrp->coreintr_status); 324 if (!usbintr && !epintr) 325 goto out; 326 327 musb->int_usb = (usbintr & wrp->usb_bitmap) >> wrp->usb_shift; 328 if (usbintr) 329 dsps_writel(reg_base, wrp->coreintr_status, usbintr); 330 331 dev_dbg(musb->controller, "usbintr (%x) epintr(%x)\n", 332 usbintr, epintr); 333 334 if (usbintr & ((1 << wrp->drvvbus) << wrp->usb_shift)) { 335 int drvvbus = dsps_readl(reg_base, wrp->status); 336 void __iomem *mregs = musb->mregs; 337 u8 devctl = dsps_readb(mregs, MUSB_DEVCTL); 338 int err; 339 340 err = musb->int_usb & MUSB_INTR_VBUSERROR; 341 if (err) { 342 /* 343 * The Mentor core doesn't debounce VBUS as needed 344 * to cope with device connect current spikes. This 345 * means it's not uncommon for bus-powered devices 346 * to get VBUS errors during enumeration. 347 * 348 * This is a workaround, but newer RTL from Mentor 349 * seems to allow a better one: "re"-starting sessions 350 * without waiting for VBUS to stop registering in 351 * devctl. 352 */ 353 musb->int_usb &= ~MUSB_INTR_VBUSERROR; 354 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL; 355 mod_timer(&glue->timer, jiffies + 356 msecs_to_jiffies(wrp->poll_timeout)); 357 WARNING("VBUS error workaround (delay coming)\n"); 358 } else if (drvvbus) { 359 MUSB_HST_MODE(musb); 360 musb->xceiv->otg->default_a = 1; 361 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; 362 del_timer(&glue->timer); 363 } else { 364 musb->is_active = 0; 365 MUSB_DEV_MODE(musb); 366 musb->xceiv->otg->default_a = 0; 367 musb->xceiv->otg->state = OTG_STATE_B_IDLE; 368 } 369 370 /* NOTE: this must complete power-on within 100 ms. */ 371 dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n", 372 drvvbus ? "on" : "off", 373 usb_otg_state_string(musb->xceiv->otg->state), 374 err ? " ERROR" : "", 375 devctl); 376 ret = IRQ_HANDLED; 377 } 378 379 if (musb->int_tx || musb->int_rx || musb->int_usb) 380 ret |= musb_interrupt(musb); 381 382 /* Poll for ID change in OTG port mode */ 383 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE && 384 musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE) 385 mod_timer(&glue->timer, jiffies + 386 msecs_to_jiffies(wrp->poll_timeout)); 387 out: 388 spin_unlock_irqrestore(&musb->lock, flags); 389 390 return ret; 391 } 392 393 static int dsps_musb_dbg_init(struct musb *musb, struct dsps_glue *glue) 394 { 395 struct dentry *root; 396 struct dentry *file; 397 char buf[128]; 398 399 sprintf(buf, "%s.dsps", dev_name(musb->controller)); 400 root = debugfs_create_dir(buf, NULL); 401 if (!root) 402 return -ENOMEM; 403 glue->dbgfs_root = root; 404 405 glue->regset.regs = dsps_musb_regs; 406 glue->regset.nregs = ARRAY_SIZE(dsps_musb_regs); 407 glue->regset.base = musb->ctrl_base; 408 409 file = debugfs_create_regset32("regdump", S_IRUGO, root, &glue->regset); 410 if (!file) { 411 debugfs_remove_recursive(root); 412 return -ENOMEM; 413 } 414 return 0; 415 } 416 417 static int dsps_musb_init(struct musb *musb) 418 { 419 struct device *dev = musb->controller; 420 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 421 struct platform_device *parent = to_platform_device(dev->parent); 422 const struct dsps_musb_wrapper *wrp = glue->wrp; 423 void __iomem *reg_base; 424 struct resource *r; 425 u32 rev, val; 426 int ret; 427 428 r = platform_get_resource_byname(parent, IORESOURCE_MEM, "control"); 429 reg_base = devm_ioremap_resource(dev, r); 430 if (IS_ERR(reg_base)) 431 return PTR_ERR(reg_base); 432 musb->ctrl_base = reg_base; 433 434 /* NOP driver needs change if supporting dual instance */ 435 musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent, "phys", 0); 436 if (IS_ERR(musb->xceiv)) 437 return PTR_ERR(musb->xceiv); 438 439 musb->phy = devm_phy_get(dev->parent, "usb2-phy"); 440 441 /* Returns zero if e.g. not clocked */ 442 rev = dsps_readl(reg_base, wrp->revision); 443 if (!rev) 444 return -ENODEV; 445 446 usb_phy_init(musb->xceiv); 447 if (IS_ERR(musb->phy)) { 448 musb->phy = NULL; 449 } else { 450 ret = phy_init(musb->phy); 451 if (ret < 0) 452 return ret; 453 ret = phy_power_on(musb->phy); 454 if (ret) { 455 phy_exit(musb->phy); 456 return ret; 457 } 458 } 459 460 setup_timer(&glue->timer, otg_timer, (unsigned long) musb); 461 462 /* Reset the musb */ 463 dsps_writel(reg_base, wrp->control, (1 << wrp->reset)); 464 465 musb->isr = dsps_interrupt; 466 467 /* reset the otgdisable bit, needed for host mode to work */ 468 val = dsps_readl(reg_base, wrp->phy_utmi); 469 val &= ~(1 << wrp->otg_disable); 470 dsps_writel(musb->ctrl_base, wrp->phy_utmi, val); 471 472 /* 473 * Check whether the dsps version has babble control enabled. 474 * In latest silicon revision the babble control logic is enabled. 475 * If MUSB_BABBLE_CTL returns 0x4 then we have the babble control 476 * logic enabled. 477 */ 478 val = dsps_readb(musb->mregs, MUSB_BABBLE_CTL); 479 if (val & MUSB_BABBLE_RCV_DISABLE) { 480 glue->sw_babble_enabled = true; 481 val |= MUSB_BABBLE_SW_SESSION_CTRL; 482 dsps_writeb(musb->mregs, MUSB_BABBLE_CTL, val); 483 } 484 485 ret = dsps_musb_dbg_init(musb, glue); 486 if (ret) 487 return ret; 488 489 return 0; 490 } 491 492 static int dsps_musb_exit(struct musb *musb) 493 { 494 struct device *dev = musb->controller; 495 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 496 497 del_timer_sync(&glue->timer); 498 usb_phy_shutdown(musb->xceiv); 499 phy_power_off(musb->phy); 500 phy_exit(musb->phy); 501 debugfs_remove_recursive(glue->dbgfs_root); 502 503 return 0; 504 } 505 506 static int dsps_musb_set_mode(struct musb *musb, u8 mode) 507 { 508 struct device *dev = musb->controller; 509 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 510 const struct dsps_musb_wrapper *wrp = glue->wrp; 511 void __iomem *ctrl_base = musb->ctrl_base; 512 u32 reg; 513 514 reg = dsps_readl(ctrl_base, wrp->mode); 515 516 switch (mode) { 517 case MUSB_HOST: 518 reg &= ~(1 << wrp->iddig); 519 520 /* 521 * if we're setting mode to host-only or device-only, we're 522 * going to ignore whatever the PHY sends us and just force 523 * ID pin status by SW 524 */ 525 reg |= (1 << wrp->iddig_mux); 526 527 dsps_writel(ctrl_base, wrp->mode, reg); 528 dsps_writel(ctrl_base, wrp->phy_utmi, 0x02); 529 break; 530 case MUSB_PERIPHERAL: 531 reg |= (1 << wrp->iddig); 532 533 /* 534 * if we're setting mode to host-only or device-only, we're 535 * going to ignore whatever the PHY sends us and just force 536 * ID pin status by SW 537 */ 538 reg |= (1 << wrp->iddig_mux); 539 540 dsps_writel(ctrl_base, wrp->mode, reg); 541 break; 542 case MUSB_OTG: 543 dsps_writel(ctrl_base, wrp->phy_utmi, 0x02); 544 break; 545 default: 546 dev_err(glue->dev, "unsupported mode %d\n", mode); 547 return -EINVAL; 548 } 549 550 return 0; 551 } 552 553 static bool dsps_sw_babble_control(struct musb *musb) 554 { 555 u8 babble_ctl; 556 bool session_restart = false; 557 558 babble_ctl = dsps_readb(musb->mregs, MUSB_BABBLE_CTL); 559 dev_dbg(musb->controller, "babble: MUSB_BABBLE_CTL value %x\n", 560 babble_ctl); 561 /* 562 * check line monitor flag to check whether babble is 563 * due to noise 564 */ 565 dev_dbg(musb->controller, "STUCK_J is %s\n", 566 babble_ctl & MUSB_BABBLE_STUCK_J ? "set" : "reset"); 567 568 if (babble_ctl & MUSB_BABBLE_STUCK_J) { 569 int timeout = 10; 570 571 /* 572 * babble is due to noise, then set transmit idle (d7 bit) 573 * to resume normal operation 574 */ 575 babble_ctl = dsps_readb(musb->mregs, MUSB_BABBLE_CTL); 576 babble_ctl |= MUSB_BABBLE_FORCE_TXIDLE; 577 dsps_writeb(musb->mregs, MUSB_BABBLE_CTL, babble_ctl); 578 579 /* wait till line monitor flag cleared */ 580 dev_dbg(musb->controller, "Set TXIDLE, wait J to clear\n"); 581 do { 582 babble_ctl = dsps_readb(musb->mregs, MUSB_BABBLE_CTL); 583 udelay(1); 584 } while ((babble_ctl & MUSB_BABBLE_STUCK_J) && timeout--); 585 586 /* check whether stuck_at_j bit cleared */ 587 if (babble_ctl & MUSB_BABBLE_STUCK_J) { 588 /* 589 * real babble condition has occurred 590 * restart the controller to start the 591 * session again 592 */ 593 dev_dbg(musb->controller, "J not cleared, misc (%x)\n", 594 babble_ctl); 595 session_restart = true; 596 } 597 } else { 598 session_restart = true; 599 } 600 601 return session_restart; 602 } 603 604 static int dsps_musb_recover(struct musb *musb) 605 { 606 struct device *dev = musb->controller; 607 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 608 int session_restart = 0; 609 610 if (glue->sw_babble_enabled) 611 session_restart = dsps_sw_babble_control(musb); 612 else 613 session_restart = 1; 614 615 return session_restart ? 0 : -EPIPE; 616 } 617 618 /* Similar to am35x, dm81xx support only 32-bit read operation */ 619 static void dsps_read_fifo32(struct musb_hw_ep *hw_ep, u16 len, u8 *dst) 620 { 621 void __iomem *fifo = hw_ep->fifo; 622 623 if (len >= 4) { 624 ioread32_rep(fifo, dst, len >> 2); 625 dst += len & ~0x03; 626 len &= 0x03; 627 } 628 629 /* Read any remaining 1 to 3 bytes */ 630 if (len > 0) { 631 u32 val = musb_readl(fifo, 0); 632 memcpy(dst, &val, len); 633 } 634 } 635 636 static struct musb_platform_ops dsps_ops = { 637 .quirks = MUSB_DMA_CPPI41 | MUSB_INDEXED_EP, 638 .init = dsps_musb_init, 639 .exit = dsps_musb_exit, 640 641 #ifdef CONFIG_USB_TI_CPPI41_DMA 642 .dma_init = cppi41_dma_controller_create, 643 .dma_exit = cppi41_dma_controller_destroy, 644 #endif 645 .enable = dsps_musb_enable, 646 .disable = dsps_musb_disable, 647 648 .try_idle = dsps_musb_try_idle, 649 .set_mode = dsps_musb_set_mode, 650 .recover = dsps_musb_recover, 651 }; 652 653 static u64 musb_dmamask = DMA_BIT_MASK(32); 654 655 static int get_int_prop(struct device_node *dn, const char *s) 656 { 657 int ret; 658 u32 val; 659 660 ret = of_property_read_u32(dn, s, &val); 661 if (ret) 662 return 0; 663 return val; 664 } 665 666 static int get_musb_port_mode(struct device *dev) 667 { 668 enum usb_dr_mode mode; 669 670 mode = of_usb_get_dr_mode(dev->of_node); 671 switch (mode) { 672 case USB_DR_MODE_HOST: 673 return MUSB_PORT_MODE_HOST; 674 675 case USB_DR_MODE_PERIPHERAL: 676 return MUSB_PORT_MODE_GADGET; 677 678 case USB_DR_MODE_UNKNOWN: 679 case USB_DR_MODE_OTG: 680 default: 681 return MUSB_PORT_MODE_DUAL_ROLE; 682 } 683 } 684 685 static int dsps_create_musb_pdev(struct dsps_glue *glue, 686 struct platform_device *parent) 687 { 688 struct musb_hdrc_platform_data pdata; 689 struct resource resources[2]; 690 struct resource *res; 691 struct device *dev = &parent->dev; 692 struct musb_hdrc_config *config; 693 struct platform_device *musb; 694 struct device_node *dn = parent->dev.of_node; 695 int ret, val; 696 697 memset(resources, 0, sizeof(resources)); 698 res = platform_get_resource_byname(parent, IORESOURCE_MEM, "mc"); 699 if (!res) { 700 dev_err(dev, "failed to get memory.\n"); 701 return -EINVAL; 702 } 703 resources[0] = *res; 704 705 res = platform_get_resource_byname(parent, IORESOURCE_IRQ, "mc"); 706 if (!res) { 707 dev_err(dev, "failed to get irq.\n"); 708 return -EINVAL; 709 } 710 resources[1] = *res; 711 712 /* allocate the child platform device */ 713 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); 714 if (!musb) { 715 dev_err(dev, "failed to allocate musb device\n"); 716 return -ENOMEM; 717 } 718 719 musb->dev.parent = dev; 720 musb->dev.dma_mask = &musb_dmamask; 721 musb->dev.coherent_dma_mask = musb_dmamask; 722 723 glue->musb = musb; 724 725 ret = platform_device_add_resources(musb, resources, 726 ARRAY_SIZE(resources)); 727 if (ret) { 728 dev_err(dev, "failed to add resources\n"); 729 goto err; 730 } 731 732 config = devm_kzalloc(&parent->dev, sizeof(*config), GFP_KERNEL); 733 if (!config) { 734 ret = -ENOMEM; 735 goto err; 736 } 737 pdata.config = config; 738 pdata.platform_ops = &dsps_ops; 739 740 config->num_eps = get_int_prop(dn, "mentor,num-eps"); 741 config->ram_bits = get_int_prop(dn, "mentor,ram-bits"); 742 config->host_port_deassert_reset_at_resume = 1; 743 pdata.mode = get_musb_port_mode(dev); 744 /* DT keeps this entry in mA, musb expects it as per USB spec */ 745 pdata.power = get_int_prop(dn, "mentor,power") / 2; 746 747 ret = of_property_read_u32(dn, "mentor,multipoint", &val); 748 if (!ret && val) 749 config->multipoint = true; 750 751 ret = platform_device_add_data(musb, &pdata, sizeof(pdata)); 752 if (ret) { 753 dev_err(dev, "failed to add platform_data\n"); 754 goto err; 755 } 756 757 ret = platform_device_add(musb); 758 if (ret) { 759 dev_err(dev, "failed to register musb device\n"); 760 goto err; 761 } 762 return 0; 763 764 err: 765 platform_device_put(musb); 766 return ret; 767 } 768 769 static int dsps_probe(struct platform_device *pdev) 770 { 771 const struct of_device_id *match; 772 const struct dsps_musb_wrapper *wrp; 773 struct dsps_glue *glue; 774 int ret; 775 776 if (!strcmp(pdev->name, "musb-hdrc")) 777 return -ENODEV; 778 779 match = of_match_node(musb_dsps_of_match, pdev->dev.of_node); 780 if (!match) { 781 dev_err(&pdev->dev, "fail to get matching of_match struct\n"); 782 return -EINVAL; 783 } 784 wrp = match->data; 785 786 if (of_device_is_compatible(pdev->dev.of_node, "ti,musb-dm816")) 787 dsps_ops.read_fifo = dsps_read_fifo32; 788 789 /* allocate glue */ 790 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); 791 if (!glue) 792 return -ENOMEM; 793 794 glue->dev = &pdev->dev; 795 glue->wrp = wrp; 796 797 platform_set_drvdata(pdev, glue); 798 pm_runtime_enable(&pdev->dev); 799 800 ret = pm_runtime_get_sync(&pdev->dev); 801 if (ret < 0) { 802 dev_err(&pdev->dev, "pm_runtime_get_sync FAILED"); 803 goto err2; 804 } 805 806 ret = dsps_create_musb_pdev(glue, pdev); 807 if (ret) 808 goto err3; 809 810 return 0; 811 812 err3: 813 pm_runtime_put(&pdev->dev); 814 err2: 815 pm_runtime_disable(&pdev->dev); 816 return ret; 817 } 818 819 static int dsps_remove(struct platform_device *pdev) 820 { 821 struct dsps_glue *glue = platform_get_drvdata(pdev); 822 823 platform_device_unregister(glue->musb); 824 825 /* disable usbss clocks */ 826 pm_runtime_put(&pdev->dev); 827 pm_runtime_disable(&pdev->dev); 828 829 return 0; 830 } 831 832 static const struct dsps_musb_wrapper am33xx_driver_data = { 833 .revision = 0x00, 834 .control = 0x14, 835 .status = 0x18, 836 .epintr_set = 0x38, 837 .epintr_clear = 0x40, 838 .epintr_status = 0x30, 839 .coreintr_set = 0x3c, 840 .coreintr_clear = 0x44, 841 .coreintr_status = 0x34, 842 .phy_utmi = 0xe0, 843 .mode = 0xe8, 844 .tx_mode = 0x70, 845 .rx_mode = 0x74, 846 .reset = 0, 847 .otg_disable = 21, 848 .iddig = 8, 849 .iddig_mux = 7, 850 .usb_shift = 0, 851 .usb_mask = 0x1ff, 852 .usb_bitmap = (0x1ff << 0), 853 .drvvbus = 8, 854 .txep_shift = 0, 855 .txep_mask = 0xffff, 856 .txep_bitmap = (0xffff << 0), 857 .rxep_shift = 16, 858 .rxep_mask = 0xfffe, 859 .rxep_bitmap = (0xfffe << 16), 860 .poll_timeout = 2000, /* ms */ 861 }; 862 863 static const struct of_device_id musb_dsps_of_match[] = { 864 { .compatible = "ti,musb-am33xx", 865 .data = &am33xx_driver_data, }, 866 { .compatible = "ti,musb-dm816", 867 .data = &am33xx_driver_data, }, 868 { }, 869 }; 870 MODULE_DEVICE_TABLE(of, musb_dsps_of_match); 871 872 #ifdef CONFIG_PM_SLEEP 873 static int dsps_suspend(struct device *dev) 874 { 875 struct dsps_glue *glue = dev_get_drvdata(dev); 876 const struct dsps_musb_wrapper *wrp = glue->wrp; 877 struct musb *musb = platform_get_drvdata(glue->musb); 878 void __iomem *mbase; 879 880 del_timer_sync(&glue->timer); 881 882 if (!musb) 883 /* This can happen if the musb device is in -EPROBE_DEFER */ 884 return 0; 885 886 mbase = musb->ctrl_base; 887 glue->context.control = dsps_readl(mbase, wrp->control); 888 glue->context.epintr = dsps_readl(mbase, wrp->epintr_set); 889 glue->context.coreintr = dsps_readl(mbase, wrp->coreintr_set); 890 glue->context.phy_utmi = dsps_readl(mbase, wrp->phy_utmi); 891 glue->context.mode = dsps_readl(mbase, wrp->mode); 892 glue->context.tx_mode = dsps_readl(mbase, wrp->tx_mode); 893 glue->context.rx_mode = dsps_readl(mbase, wrp->rx_mode); 894 895 return 0; 896 } 897 898 static int dsps_resume(struct device *dev) 899 { 900 struct dsps_glue *glue = dev_get_drvdata(dev); 901 const struct dsps_musb_wrapper *wrp = glue->wrp; 902 struct musb *musb = platform_get_drvdata(glue->musb); 903 void __iomem *mbase; 904 905 if (!musb) 906 return 0; 907 908 mbase = musb->ctrl_base; 909 dsps_writel(mbase, wrp->control, glue->context.control); 910 dsps_writel(mbase, wrp->epintr_set, glue->context.epintr); 911 dsps_writel(mbase, wrp->coreintr_set, glue->context.coreintr); 912 dsps_writel(mbase, wrp->phy_utmi, glue->context.phy_utmi); 913 dsps_writel(mbase, wrp->mode, glue->context.mode); 914 dsps_writel(mbase, wrp->tx_mode, glue->context.tx_mode); 915 dsps_writel(mbase, wrp->rx_mode, glue->context.rx_mode); 916 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE && 917 musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE) 918 mod_timer(&glue->timer, jiffies + 919 msecs_to_jiffies(wrp->poll_timeout)); 920 921 return 0; 922 } 923 #endif 924 925 static SIMPLE_DEV_PM_OPS(dsps_pm_ops, dsps_suspend, dsps_resume); 926 927 static struct platform_driver dsps_usbss_driver = { 928 .probe = dsps_probe, 929 .remove = dsps_remove, 930 .driver = { 931 .name = "musb-dsps", 932 .pm = &dsps_pm_ops, 933 .of_match_table = musb_dsps_of_match, 934 }, 935 }; 936 937 MODULE_DESCRIPTION("TI DSPS MUSB Glue Layer"); 938 MODULE_AUTHOR("Ravi B <ravibabu@ti.com>"); 939 MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>"); 940 MODULE_LICENSE("GPL v2"); 941 942 module_platform_driver(dsps_usbss_driver); 943