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 in dual-role idle mode */ 229 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE && 230 musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE) 231 mod_timer(&glue->timer, jiffies + 232 msecs_to_jiffies(wrp->poll_timeout)); 233 dsps_musb_try_idle(musb, 0); 234 } 235 236 /** 237 * dsps_musb_disable - disable HDRC and flush interrupts 238 */ 239 static void dsps_musb_disable(struct musb *musb) 240 { 241 struct device *dev = musb->controller; 242 struct platform_device *pdev = to_platform_device(dev->parent); 243 struct dsps_glue *glue = platform_get_drvdata(pdev); 244 const struct dsps_musb_wrapper *wrp = glue->wrp; 245 void __iomem *reg_base = musb->ctrl_base; 246 247 dsps_writel(reg_base, wrp->coreintr_clear, wrp->usb_bitmap); 248 dsps_writel(reg_base, wrp->epintr_clear, 249 wrp->txep_bitmap | wrp->rxep_bitmap); 250 dsps_writeb(musb->mregs, MUSB_DEVCTL, 0); 251 } 252 253 static void otg_timer(unsigned long _musb) 254 { 255 struct musb *musb = (void *)_musb; 256 void __iomem *mregs = musb->mregs; 257 struct device *dev = musb->controller; 258 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 259 const struct dsps_musb_wrapper *wrp = glue->wrp; 260 u8 devctl; 261 unsigned long flags; 262 int skip_session = 0; 263 264 /* 265 * We poll because DSPS IP's won't expose several OTG-critical 266 * status change events (from the transceiver) otherwise. 267 */ 268 devctl = dsps_readb(mregs, MUSB_DEVCTL); 269 dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl, 270 usb_otg_state_string(musb->xceiv->otg->state)); 271 272 spin_lock_irqsave(&musb->lock, flags); 273 switch (musb->xceiv->otg->state) { 274 case OTG_STATE_A_WAIT_BCON: 275 dsps_writeb(musb->mregs, MUSB_DEVCTL, 0); 276 skip_session = 1; 277 /* fall */ 278 279 case OTG_STATE_A_IDLE: 280 case OTG_STATE_B_IDLE: 281 if (devctl & MUSB_DEVCTL_BDEVICE) { 282 musb->xceiv->otg->state = OTG_STATE_B_IDLE; 283 MUSB_DEV_MODE(musb); 284 } else { 285 musb->xceiv->otg->state = OTG_STATE_A_IDLE; 286 MUSB_HST_MODE(musb); 287 } 288 if (!(devctl & MUSB_DEVCTL_SESSION) && !skip_session) 289 dsps_writeb(mregs, MUSB_DEVCTL, MUSB_DEVCTL_SESSION); 290 mod_timer(&glue->timer, jiffies + 291 msecs_to_jiffies(wrp->poll_timeout)); 292 break; 293 case OTG_STATE_A_WAIT_VFALL: 294 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; 295 dsps_writel(musb->ctrl_base, wrp->coreintr_set, 296 MUSB_INTR_VBUSERROR << wrp->usb_shift); 297 break; 298 default: 299 break; 300 } 301 spin_unlock_irqrestore(&musb->lock, flags); 302 } 303 304 static irqreturn_t dsps_interrupt(int irq, void *hci) 305 { 306 struct musb *musb = hci; 307 void __iomem *reg_base = musb->ctrl_base; 308 struct device *dev = musb->controller; 309 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 310 const struct dsps_musb_wrapper *wrp = glue->wrp; 311 unsigned long flags; 312 irqreturn_t ret = IRQ_NONE; 313 u32 epintr, usbintr; 314 315 spin_lock_irqsave(&musb->lock, flags); 316 317 /* Get endpoint interrupts */ 318 epintr = dsps_readl(reg_base, wrp->epintr_status); 319 musb->int_rx = (epintr & wrp->rxep_bitmap) >> wrp->rxep_shift; 320 musb->int_tx = (epintr & wrp->txep_bitmap) >> wrp->txep_shift; 321 322 if (epintr) 323 dsps_writel(reg_base, wrp->epintr_status, epintr); 324 325 /* Get usb core interrupts */ 326 usbintr = dsps_readl(reg_base, wrp->coreintr_status); 327 if (!usbintr && !epintr) 328 goto out; 329 330 musb->int_usb = (usbintr & wrp->usb_bitmap) >> wrp->usb_shift; 331 if (usbintr) 332 dsps_writel(reg_base, wrp->coreintr_status, usbintr); 333 334 dev_dbg(musb->controller, "usbintr (%x) epintr(%x)\n", 335 usbintr, epintr); 336 337 if (usbintr & ((1 << wrp->drvvbus) << wrp->usb_shift)) { 338 int drvvbus = dsps_readl(reg_base, wrp->status); 339 void __iomem *mregs = musb->mregs; 340 u8 devctl = dsps_readb(mregs, MUSB_DEVCTL); 341 int err; 342 343 err = musb->int_usb & MUSB_INTR_VBUSERROR; 344 if (err) { 345 /* 346 * The Mentor core doesn't debounce VBUS as needed 347 * to cope with device connect current spikes. This 348 * means it's not uncommon for bus-powered devices 349 * to get VBUS errors during enumeration. 350 * 351 * This is a workaround, but newer RTL from Mentor 352 * seems to allow a better one: "re"-starting sessions 353 * without waiting for VBUS to stop registering in 354 * devctl. 355 */ 356 musb->int_usb &= ~MUSB_INTR_VBUSERROR; 357 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL; 358 mod_timer(&glue->timer, jiffies + 359 msecs_to_jiffies(wrp->poll_timeout)); 360 WARNING("VBUS error workaround (delay coming)\n"); 361 } else if (drvvbus) { 362 MUSB_HST_MODE(musb); 363 musb->xceiv->otg->default_a = 1; 364 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; 365 del_timer(&glue->timer); 366 } else { 367 musb->is_active = 0; 368 MUSB_DEV_MODE(musb); 369 musb->xceiv->otg->default_a = 0; 370 musb->xceiv->otg->state = OTG_STATE_B_IDLE; 371 } 372 373 /* NOTE: this must complete power-on within 100 ms. */ 374 dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n", 375 drvvbus ? "on" : "off", 376 usb_otg_state_string(musb->xceiv->otg->state), 377 err ? " ERROR" : "", 378 devctl); 379 ret = IRQ_HANDLED; 380 } 381 382 if (musb->int_tx || musb->int_rx || musb->int_usb) 383 ret |= musb_interrupt(musb); 384 385 /* Poll for ID change in OTG port mode */ 386 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE && 387 musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE) 388 mod_timer(&glue->timer, jiffies + 389 msecs_to_jiffies(wrp->poll_timeout)); 390 out: 391 spin_unlock_irqrestore(&musb->lock, flags); 392 393 return ret; 394 } 395 396 static int dsps_musb_dbg_init(struct musb *musb, struct dsps_glue *glue) 397 { 398 struct dentry *root; 399 struct dentry *file; 400 char buf[128]; 401 402 sprintf(buf, "%s.dsps", dev_name(musb->controller)); 403 root = debugfs_create_dir(buf, NULL); 404 if (!root) 405 return -ENOMEM; 406 glue->dbgfs_root = root; 407 408 glue->regset.regs = dsps_musb_regs; 409 glue->regset.nregs = ARRAY_SIZE(dsps_musb_regs); 410 glue->regset.base = musb->ctrl_base; 411 412 file = debugfs_create_regset32("regdump", S_IRUGO, root, &glue->regset); 413 if (!file) { 414 debugfs_remove_recursive(root); 415 return -ENOMEM; 416 } 417 return 0; 418 } 419 420 static int dsps_musb_init(struct musb *musb) 421 { 422 struct device *dev = musb->controller; 423 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 424 struct platform_device *parent = to_platform_device(dev->parent); 425 const struct dsps_musb_wrapper *wrp = glue->wrp; 426 void __iomem *reg_base; 427 struct resource *r; 428 u32 rev, val; 429 int ret; 430 431 r = platform_get_resource_byname(parent, IORESOURCE_MEM, "control"); 432 reg_base = devm_ioremap_resource(dev, r); 433 if (IS_ERR(reg_base)) 434 return PTR_ERR(reg_base); 435 musb->ctrl_base = reg_base; 436 437 /* NOP driver needs change if supporting dual instance */ 438 musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent, "phys", 0); 439 if (IS_ERR(musb->xceiv)) 440 return PTR_ERR(musb->xceiv); 441 442 musb->phy = devm_phy_get(dev->parent, "usb2-phy"); 443 444 /* Returns zero if e.g. not clocked */ 445 rev = dsps_readl(reg_base, wrp->revision); 446 if (!rev) 447 return -ENODEV; 448 449 usb_phy_init(musb->xceiv); 450 if (IS_ERR(musb->phy)) { 451 musb->phy = NULL; 452 } else { 453 ret = phy_init(musb->phy); 454 if (ret < 0) 455 return ret; 456 ret = phy_power_on(musb->phy); 457 if (ret) { 458 phy_exit(musb->phy); 459 return ret; 460 } 461 } 462 463 setup_timer(&glue->timer, otg_timer, (unsigned long) musb); 464 465 /* Reset the musb */ 466 dsps_writel(reg_base, wrp->control, (1 << wrp->reset)); 467 468 musb->isr = dsps_interrupt; 469 470 /* reset the otgdisable bit, needed for host mode to work */ 471 val = dsps_readl(reg_base, wrp->phy_utmi); 472 val &= ~(1 << wrp->otg_disable); 473 dsps_writel(musb->ctrl_base, wrp->phy_utmi, val); 474 475 /* 476 * Check whether the dsps version has babble control enabled. 477 * In latest silicon revision the babble control logic is enabled. 478 * If MUSB_BABBLE_CTL returns 0x4 then we have the babble control 479 * logic enabled. 480 */ 481 val = dsps_readb(musb->mregs, MUSB_BABBLE_CTL); 482 if (val & MUSB_BABBLE_RCV_DISABLE) { 483 glue->sw_babble_enabled = true; 484 val |= MUSB_BABBLE_SW_SESSION_CTRL; 485 dsps_writeb(musb->mregs, MUSB_BABBLE_CTL, val); 486 } 487 488 return dsps_musb_dbg_init(musb, glue); 489 } 490 491 static int dsps_musb_exit(struct musb *musb) 492 { 493 struct device *dev = musb->controller; 494 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 495 496 del_timer_sync(&glue->timer); 497 usb_phy_shutdown(musb->xceiv); 498 phy_power_off(musb->phy); 499 phy_exit(musb->phy); 500 debugfs_remove_recursive(glue->dbgfs_root); 501 502 return 0; 503 } 504 505 static int dsps_musb_set_mode(struct musb *musb, u8 mode) 506 { 507 struct device *dev = musb->controller; 508 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 509 const struct dsps_musb_wrapper *wrp = glue->wrp; 510 void __iomem *ctrl_base = musb->ctrl_base; 511 u32 reg; 512 513 reg = dsps_readl(ctrl_base, wrp->mode); 514 515 switch (mode) { 516 case MUSB_HOST: 517 reg &= ~(1 << wrp->iddig); 518 519 /* 520 * if we're setting mode to host-only or device-only, we're 521 * going to ignore whatever the PHY sends us and just force 522 * ID pin status by SW 523 */ 524 reg |= (1 << wrp->iddig_mux); 525 526 dsps_writel(ctrl_base, wrp->mode, reg); 527 dsps_writel(ctrl_base, wrp->phy_utmi, 0x02); 528 break; 529 case MUSB_PERIPHERAL: 530 reg |= (1 << wrp->iddig); 531 532 /* 533 * if we're setting mode to host-only or device-only, we're 534 * going to ignore whatever the PHY sends us and just force 535 * ID pin status by SW 536 */ 537 reg |= (1 << wrp->iddig_mux); 538 539 dsps_writel(ctrl_base, wrp->mode, reg); 540 break; 541 case MUSB_OTG: 542 dsps_writel(ctrl_base, wrp->phy_utmi, 0x02); 543 break; 544 default: 545 dev_err(glue->dev, "unsupported mode %d\n", mode); 546 return -EINVAL; 547 } 548 549 return 0; 550 } 551 552 static bool dsps_sw_babble_control(struct musb *musb) 553 { 554 u8 babble_ctl; 555 bool session_restart = false; 556 557 babble_ctl = dsps_readb(musb->mregs, MUSB_BABBLE_CTL); 558 dev_dbg(musb->controller, "babble: MUSB_BABBLE_CTL value %x\n", 559 babble_ctl); 560 /* 561 * check line monitor flag to check whether babble is 562 * due to noise 563 */ 564 dev_dbg(musb->controller, "STUCK_J is %s\n", 565 babble_ctl & MUSB_BABBLE_STUCK_J ? "set" : "reset"); 566 567 if (babble_ctl & MUSB_BABBLE_STUCK_J) { 568 int timeout = 10; 569 570 /* 571 * babble is due to noise, then set transmit idle (d7 bit) 572 * to resume normal operation 573 */ 574 babble_ctl = dsps_readb(musb->mregs, MUSB_BABBLE_CTL); 575 babble_ctl |= MUSB_BABBLE_FORCE_TXIDLE; 576 dsps_writeb(musb->mregs, MUSB_BABBLE_CTL, babble_ctl); 577 578 /* wait till line monitor flag cleared */ 579 dev_dbg(musb->controller, "Set TXIDLE, wait J to clear\n"); 580 do { 581 babble_ctl = dsps_readb(musb->mregs, MUSB_BABBLE_CTL); 582 udelay(1); 583 } while ((babble_ctl & MUSB_BABBLE_STUCK_J) && timeout--); 584 585 /* check whether stuck_at_j bit cleared */ 586 if (babble_ctl & MUSB_BABBLE_STUCK_J) { 587 /* 588 * real babble condition has occurred 589 * restart the controller to start the 590 * session again 591 */ 592 dev_dbg(musb->controller, "J not cleared, misc (%x)\n", 593 babble_ctl); 594 session_restart = true; 595 } 596 } else { 597 session_restart = true; 598 } 599 600 return session_restart; 601 } 602 603 static int dsps_musb_recover(struct musb *musb) 604 { 605 struct device *dev = musb->controller; 606 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 607 int session_restart = 0; 608 609 if (glue->sw_babble_enabled) 610 session_restart = dsps_sw_babble_control(musb); 611 else 612 session_restart = 1; 613 614 return session_restart ? 0 : -EPIPE; 615 } 616 617 /* Similar to am35x, dm81xx support only 32-bit read operation */ 618 static void dsps_read_fifo32(struct musb_hw_ep *hw_ep, u16 len, u8 *dst) 619 { 620 void __iomem *fifo = hw_ep->fifo; 621 622 if (len >= 4) { 623 ioread32_rep(fifo, dst, len >> 2); 624 dst += len & ~0x03; 625 len &= 0x03; 626 } 627 628 /* Read any remaining 1 to 3 bytes */ 629 if (len > 0) { 630 u32 val = musb_readl(fifo, 0); 631 memcpy(dst, &val, len); 632 } 633 } 634 635 static struct musb_platform_ops dsps_ops = { 636 .quirks = MUSB_DMA_CPPI41 | MUSB_INDEXED_EP, 637 .init = dsps_musb_init, 638 .exit = dsps_musb_exit, 639 640 #ifdef CONFIG_USB_TI_CPPI41_DMA 641 .dma_init = cppi41_dma_controller_create, 642 .dma_exit = cppi41_dma_controller_destroy, 643 #endif 644 .enable = dsps_musb_enable, 645 .disable = dsps_musb_disable, 646 647 .try_idle = dsps_musb_try_idle, 648 .set_mode = dsps_musb_set_mode, 649 .recover = dsps_musb_recover, 650 }; 651 652 static u64 musb_dmamask = DMA_BIT_MASK(32); 653 654 static int get_int_prop(struct device_node *dn, const char *s) 655 { 656 int ret; 657 u32 val; 658 659 ret = of_property_read_u32(dn, s, &val); 660 if (ret) 661 return 0; 662 return val; 663 } 664 665 static int get_musb_port_mode(struct device *dev) 666 { 667 enum usb_dr_mode mode; 668 669 mode = of_usb_get_dr_mode(dev->of_node); 670 switch (mode) { 671 case USB_DR_MODE_HOST: 672 return MUSB_PORT_MODE_HOST; 673 674 case USB_DR_MODE_PERIPHERAL: 675 return MUSB_PORT_MODE_GADGET; 676 677 case USB_DR_MODE_UNKNOWN: 678 case USB_DR_MODE_OTG: 679 default: 680 return MUSB_PORT_MODE_DUAL_ROLE; 681 } 682 } 683 684 static int dsps_create_musb_pdev(struct dsps_glue *glue, 685 struct platform_device *parent) 686 { 687 struct musb_hdrc_platform_data pdata; 688 struct resource resources[2]; 689 struct resource *res; 690 struct device *dev = &parent->dev; 691 struct musb_hdrc_config *config; 692 struct platform_device *musb; 693 struct device_node *dn = parent->dev.of_node; 694 int ret, val; 695 696 memset(resources, 0, sizeof(resources)); 697 res = platform_get_resource_byname(parent, IORESOURCE_MEM, "mc"); 698 if (!res) { 699 dev_err(dev, "failed to get memory.\n"); 700 return -EINVAL; 701 } 702 resources[0] = *res; 703 704 res = platform_get_resource_byname(parent, IORESOURCE_IRQ, "mc"); 705 if (!res) { 706 dev_err(dev, "failed to get irq.\n"); 707 return -EINVAL; 708 } 709 resources[1] = *res; 710 711 /* allocate the child platform device */ 712 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); 713 if (!musb) { 714 dev_err(dev, "failed to allocate musb device\n"); 715 return -ENOMEM; 716 } 717 718 musb->dev.parent = dev; 719 musb->dev.dma_mask = &musb_dmamask; 720 musb->dev.coherent_dma_mask = musb_dmamask; 721 722 glue->musb = musb; 723 724 ret = platform_device_add_resources(musb, resources, 725 ARRAY_SIZE(resources)); 726 if (ret) { 727 dev_err(dev, "failed to add resources\n"); 728 goto err; 729 } 730 731 config = devm_kzalloc(&parent->dev, sizeof(*config), GFP_KERNEL); 732 if (!config) { 733 ret = -ENOMEM; 734 goto err; 735 } 736 pdata.config = config; 737 pdata.platform_ops = &dsps_ops; 738 739 config->num_eps = get_int_prop(dn, "mentor,num-eps"); 740 config->ram_bits = get_int_prop(dn, "mentor,ram-bits"); 741 config->host_port_deassert_reset_at_resume = 1; 742 pdata.mode = get_musb_port_mode(dev); 743 /* DT keeps this entry in mA, musb expects it as per USB spec */ 744 pdata.power = get_int_prop(dn, "mentor,power") / 2; 745 746 ret = of_property_read_u32(dn, "mentor,multipoint", &val); 747 if (!ret && val) 748 config->multipoint = true; 749 750 ret = platform_device_add_data(musb, &pdata, sizeof(pdata)); 751 if (ret) { 752 dev_err(dev, "failed to add platform_data\n"); 753 goto err; 754 } 755 756 ret = platform_device_add(musb); 757 if (ret) { 758 dev_err(dev, "failed to register musb device\n"); 759 goto err; 760 } 761 return 0; 762 763 err: 764 platform_device_put(musb); 765 return ret; 766 } 767 768 static int dsps_probe(struct platform_device *pdev) 769 { 770 const struct of_device_id *match; 771 const struct dsps_musb_wrapper *wrp; 772 struct dsps_glue *glue; 773 int ret; 774 775 if (!strcmp(pdev->name, "musb-hdrc")) 776 return -ENODEV; 777 778 match = of_match_node(musb_dsps_of_match, pdev->dev.of_node); 779 if (!match) { 780 dev_err(&pdev->dev, "fail to get matching of_match struct\n"); 781 return -EINVAL; 782 } 783 wrp = match->data; 784 785 if (of_device_is_compatible(pdev->dev.of_node, "ti,musb-dm816")) 786 dsps_ops.read_fifo = dsps_read_fifo32; 787 788 /* allocate glue */ 789 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); 790 if (!glue) 791 return -ENOMEM; 792 793 glue->dev = &pdev->dev; 794 glue->wrp = wrp; 795 796 platform_set_drvdata(pdev, glue); 797 pm_runtime_enable(&pdev->dev); 798 799 ret = pm_runtime_get_sync(&pdev->dev); 800 if (ret < 0) { 801 dev_err(&pdev->dev, "pm_runtime_get_sync FAILED"); 802 goto err2; 803 } 804 805 ret = dsps_create_musb_pdev(glue, pdev); 806 if (ret) 807 goto err3; 808 809 return 0; 810 811 err3: 812 pm_runtime_put(&pdev->dev); 813 err2: 814 pm_runtime_disable(&pdev->dev); 815 return ret; 816 } 817 818 static int dsps_remove(struct platform_device *pdev) 819 { 820 struct dsps_glue *glue = platform_get_drvdata(pdev); 821 822 platform_device_unregister(glue->musb); 823 824 /* disable usbss clocks */ 825 pm_runtime_put(&pdev->dev); 826 pm_runtime_disable(&pdev->dev); 827 828 return 0; 829 } 830 831 static const struct dsps_musb_wrapper am33xx_driver_data = { 832 .revision = 0x00, 833 .control = 0x14, 834 .status = 0x18, 835 .epintr_set = 0x38, 836 .epintr_clear = 0x40, 837 .epintr_status = 0x30, 838 .coreintr_set = 0x3c, 839 .coreintr_clear = 0x44, 840 .coreintr_status = 0x34, 841 .phy_utmi = 0xe0, 842 .mode = 0xe8, 843 .tx_mode = 0x70, 844 .rx_mode = 0x74, 845 .reset = 0, 846 .otg_disable = 21, 847 .iddig = 8, 848 .iddig_mux = 7, 849 .usb_shift = 0, 850 .usb_mask = 0x1ff, 851 .usb_bitmap = (0x1ff << 0), 852 .drvvbus = 8, 853 .txep_shift = 0, 854 .txep_mask = 0xffff, 855 .txep_bitmap = (0xffff << 0), 856 .rxep_shift = 16, 857 .rxep_mask = 0xfffe, 858 .rxep_bitmap = (0xfffe << 16), 859 .poll_timeout = 2000, /* ms */ 860 }; 861 862 static const struct of_device_id musb_dsps_of_match[] = { 863 { .compatible = "ti,musb-am33xx", 864 .data = &am33xx_driver_data, }, 865 { .compatible = "ti,musb-dm816", 866 .data = &am33xx_driver_data, }, 867 { }, 868 }; 869 MODULE_DEVICE_TABLE(of, musb_dsps_of_match); 870 871 #ifdef CONFIG_PM_SLEEP 872 static int dsps_suspend(struct device *dev) 873 { 874 struct dsps_glue *glue = dev_get_drvdata(dev); 875 const struct dsps_musb_wrapper *wrp = glue->wrp; 876 struct musb *musb = platform_get_drvdata(glue->musb); 877 void __iomem *mbase; 878 879 del_timer_sync(&glue->timer); 880 881 if (!musb) 882 /* This can happen if the musb device is in -EPROBE_DEFER */ 883 return 0; 884 885 mbase = musb->ctrl_base; 886 glue->context.control = dsps_readl(mbase, wrp->control); 887 glue->context.epintr = dsps_readl(mbase, wrp->epintr_set); 888 glue->context.coreintr = dsps_readl(mbase, wrp->coreintr_set); 889 glue->context.phy_utmi = dsps_readl(mbase, wrp->phy_utmi); 890 glue->context.mode = dsps_readl(mbase, wrp->mode); 891 glue->context.tx_mode = dsps_readl(mbase, wrp->tx_mode); 892 glue->context.rx_mode = dsps_readl(mbase, wrp->rx_mode); 893 894 return 0; 895 } 896 897 static int dsps_resume(struct device *dev) 898 { 899 struct dsps_glue *glue = dev_get_drvdata(dev); 900 const struct dsps_musb_wrapper *wrp = glue->wrp; 901 struct musb *musb = platform_get_drvdata(glue->musb); 902 void __iomem *mbase; 903 904 if (!musb) 905 return 0; 906 907 mbase = musb->ctrl_base; 908 dsps_writel(mbase, wrp->control, glue->context.control); 909 dsps_writel(mbase, wrp->epintr_set, glue->context.epintr); 910 dsps_writel(mbase, wrp->coreintr_set, glue->context.coreintr); 911 dsps_writel(mbase, wrp->phy_utmi, glue->context.phy_utmi); 912 dsps_writel(mbase, wrp->mode, glue->context.mode); 913 dsps_writel(mbase, wrp->tx_mode, glue->context.tx_mode); 914 dsps_writel(mbase, wrp->rx_mode, glue->context.rx_mode); 915 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE && 916 musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE) 917 mod_timer(&glue->timer, jiffies + 918 msecs_to_jiffies(wrp->poll_timeout)); 919 920 return 0; 921 } 922 #endif 923 924 static SIMPLE_DEV_PM_OPS(dsps_pm_ops, dsps_suspend, dsps_resume); 925 926 static struct platform_driver dsps_usbss_driver = { 927 .probe = dsps_probe, 928 .remove = dsps_remove, 929 .driver = { 930 .name = "musb-dsps", 931 .pm = &dsps_pm_ops, 932 .of_match_table = musb_dsps_of_match, 933 }, 934 }; 935 936 MODULE_DESCRIPTION("TI DSPS MUSB Glue Layer"); 937 MODULE_AUTHOR("Ravi B <ravibabu@ti.com>"); 938 MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>"); 939 MODULE_LICENSE("GPL v2"); 940 941 module_platform_driver(dsps_usbss_driver); 942