1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Texas Instruments DSPS platforms "glue layer" 4 * 5 * Copyright (C) 2012, by Texas Instruments 6 * 7 * Based on the am35x "glue layer" code. 8 * 9 * This file is part of the Inventra Controller Driver for Linux. 10 * 11 * musb_dsps.c will be a common file for all the TI DSPS platforms 12 * such as dm64x, dm36x, dm35x, da8x, am35x and ti81x. 13 * For now only ti81x is using this and in future davinci.c, am35x.c 14 * da8xx.c would be merged to this file after testing. 15 */ 16 17 #include <linux/io.h> 18 #include <linux/irq.h> 19 #include <linux/err.h> 20 #include <linux/platform_device.h> 21 #include <linux/dma-mapping.h> 22 #include <linux/pm_runtime.h> 23 #include <linux/module.h> 24 #include <linux/usb/usb_phy_generic.h> 25 #include <linux/platform_data/usb-omap.h> 26 #include <linux/sizes.h> 27 28 #include <linux/of.h> 29 #include <linux/of_address.h> 30 #include <linux/usb/of.h> 31 32 #include <linux/debugfs.h> 33 34 #include "musb_core.h" 35 36 static const struct of_device_id musb_dsps_of_match[]; 37 38 /* 39 * DSPS musb wrapper register offset. 40 * FIXME: This should be expanded to have all the wrapper registers from TI DSPS 41 * musb ips. 42 */ 43 struct dsps_musb_wrapper { 44 u16 revision; 45 u16 control; 46 u16 status; 47 u16 epintr_set; 48 u16 epintr_clear; 49 u16 epintr_status; 50 u16 coreintr_set; 51 u16 coreintr_clear; 52 u16 coreintr_status; 53 u16 phy_utmi; 54 u16 mode; 55 u16 tx_mode; 56 u16 rx_mode; 57 58 /* bit positions for control */ 59 unsigned reset:5; 60 61 /* bit positions for interrupt */ 62 unsigned usb_shift:5; 63 u32 usb_mask; 64 u32 usb_bitmap; 65 unsigned drvvbus:5; 66 67 unsigned txep_shift:5; 68 u32 txep_mask; 69 u32 txep_bitmap; 70 71 unsigned rxep_shift:5; 72 u32 rxep_mask; 73 u32 rxep_bitmap; 74 75 /* bit positions for phy_utmi */ 76 unsigned otg_disable:5; 77 78 /* bit positions for mode */ 79 unsigned iddig:5; 80 unsigned iddig_mux:5; 81 /* miscellaneous stuff */ 82 unsigned poll_timeout; 83 }; 84 85 /* 86 * register shadow for suspend 87 */ 88 struct dsps_context { 89 u32 control; 90 u32 epintr; 91 u32 coreintr; 92 u32 phy_utmi; 93 u32 mode; 94 u32 tx_mode; 95 u32 rx_mode; 96 }; 97 98 /* 99 * DSPS glue structure. 100 */ 101 struct dsps_glue { 102 struct device *dev; 103 struct platform_device *musb; /* child musb pdev */ 104 const struct dsps_musb_wrapper *wrp; /* wrapper register offsets */ 105 int vbus_irq; /* optional vbus irq */ 106 unsigned long last_timer; /* last timer data for each instance */ 107 bool sw_babble_enabled; 108 void __iomem *usbss_base; 109 110 struct dsps_context context; 111 struct debugfs_regset32 regset; 112 struct dentry *dbgfs_root; 113 }; 114 115 static const struct debugfs_reg32 dsps_musb_regs[] = { 116 { "revision", 0x00 }, 117 { "control", 0x14 }, 118 { "status", 0x18 }, 119 { "eoi", 0x24 }, 120 { "intr0_stat", 0x30 }, 121 { "intr1_stat", 0x34 }, 122 { "intr0_set", 0x38 }, 123 { "intr1_set", 0x3c }, 124 { "txmode", 0x70 }, 125 { "rxmode", 0x74 }, 126 { "autoreq", 0xd0 }, 127 { "srpfixtime", 0xd4 }, 128 { "tdown", 0xd8 }, 129 { "phy_utmi", 0xe0 }, 130 { "mode", 0xe8 }, 131 }; 132 133 static void dsps_mod_timer(struct dsps_glue *glue, int wait_ms) 134 { 135 struct musb *musb = platform_get_drvdata(glue->musb); 136 int wait; 137 138 if (wait_ms < 0) 139 wait = msecs_to_jiffies(glue->wrp->poll_timeout); 140 else 141 wait = msecs_to_jiffies(wait_ms); 142 143 mod_timer(&musb->dev_timer, jiffies + wait); 144 } 145 146 /* 147 * If no vbus irq from the PMIC is configured, we need to poll VBUS status. 148 */ 149 static void dsps_mod_timer_optional(struct dsps_glue *glue) 150 { 151 if (glue->vbus_irq) 152 return; 153 154 dsps_mod_timer(glue, -1); 155 } 156 157 /* USBSS / USB AM335x */ 158 #define USBSS_IRQ_STATUS 0x28 159 #define USBSS_IRQ_ENABLER 0x2c 160 #define USBSS_IRQ_CLEARR 0x30 161 162 #define USBSS_IRQ_PD_COMP (1 << 2) 163 164 /* 165 * dsps_musb_enable - enable interrupts 166 */ 167 static void dsps_musb_enable(struct musb *musb) 168 { 169 struct device *dev = musb->controller; 170 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 171 const struct dsps_musb_wrapper *wrp = glue->wrp; 172 void __iomem *reg_base = musb->ctrl_base; 173 u32 epmask, coremask; 174 175 /* Workaround: setup IRQs through both register sets. */ 176 epmask = ((musb->epmask & wrp->txep_mask) << wrp->txep_shift) | 177 ((musb->epmask & wrp->rxep_mask) << wrp->rxep_shift); 178 coremask = (wrp->usb_bitmap & ~MUSB_INTR_SOF); 179 180 musb_writel(reg_base, wrp->epintr_set, epmask); 181 musb_writel(reg_base, wrp->coreintr_set, coremask); 182 /* 183 * start polling for runtime PM active and idle, 184 * and for ID change in dual-role idle mode. 185 */ 186 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE) 187 dsps_mod_timer(glue, -1); 188 } 189 190 /* 191 * dsps_musb_disable - disable HDRC and flush interrupts 192 */ 193 static void dsps_musb_disable(struct musb *musb) 194 { 195 struct device *dev = musb->controller; 196 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 197 const struct dsps_musb_wrapper *wrp = glue->wrp; 198 void __iomem *reg_base = musb->ctrl_base; 199 200 musb_writel(reg_base, wrp->coreintr_clear, wrp->usb_bitmap); 201 musb_writel(reg_base, wrp->epintr_clear, 202 wrp->txep_bitmap | wrp->rxep_bitmap); 203 del_timer_sync(&musb->dev_timer); 204 } 205 206 /* Caller must take musb->lock */ 207 static int dsps_check_status(struct musb *musb, void *unused) 208 { 209 void __iomem *mregs = musb->mregs; 210 struct device *dev = musb->controller; 211 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 212 const struct dsps_musb_wrapper *wrp = glue->wrp; 213 u8 devctl; 214 int skip_session = 0; 215 216 if (glue->vbus_irq) 217 del_timer(&musb->dev_timer); 218 219 /* 220 * We poll because DSPS IP's won't expose several OTG-critical 221 * status change events (from the transceiver) otherwise. 222 */ 223 devctl = musb_readb(mregs, MUSB_DEVCTL); 224 dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl, 225 usb_otg_state_string(musb->xceiv->otg->state)); 226 227 switch (musb->xceiv->otg->state) { 228 case OTG_STATE_A_WAIT_VRISE: 229 if (musb->port_mode == MUSB_HOST) { 230 musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON; 231 dsps_mod_timer_optional(glue); 232 break; 233 } 234 fallthrough; 235 236 case OTG_STATE_A_WAIT_BCON: 237 /* keep VBUS on for host-only mode */ 238 if (musb->port_mode == MUSB_HOST) { 239 dsps_mod_timer_optional(glue); 240 break; 241 } 242 musb_writeb(musb->mregs, MUSB_DEVCTL, 0); 243 skip_session = 1; 244 fallthrough; 245 246 case OTG_STATE_A_IDLE: 247 case OTG_STATE_B_IDLE: 248 if (!glue->vbus_irq) { 249 if (devctl & MUSB_DEVCTL_BDEVICE) { 250 musb->xceiv->otg->state = OTG_STATE_B_IDLE; 251 MUSB_DEV_MODE(musb); 252 } else { 253 musb->xceiv->otg->state = OTG_STATE_A_IDLE; 254 MUSB_HST_MODE(musb); 255 } 256 257 if (musb->port_mode == MUSB_PERIPHERAL) 258 skip_session = 1; 259 260 if (!(devctl & MUSB_DEVCTL_SESSION) && !skip_session) 261 musb_writeb(mregs, MUSB_DEVCTL, 262 MUSB_DEVCTL_SESSION); 263 } 264 dsps_mod_timer_optional(glue); 265 break; 266 case OTG_STATE_A_WAIT_VFALL: 267 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; 268 musb_writel(musb->ctrl_base, wrp->coreintr_set, 269 MUSB_INTR_VBUSERROR << wrp->usb_shift); 270 break; 271 default: 272 break; 273 } 274 275 return 0; 276 } 277 278 static void otg_timer(struct timer_list *t) 279 { 280 struct musb *musb = from_timer(musb, t, dev_timer); 281 struct device *dev = musb->controller; 282 unsigned long flags; 283 int err; 284 285 err = pm_runtime_get(dev); 286 if ((err != -EINPROGRESS) && err < 0) { 287 dev_err(dev, "Poll could not pm_runtime_get: %i\n", err); 288 pm_runtime_put_noidle(dev); 289 290 return; 291 } 292 293 spin_lock_irqsave(&musb->lock, flags); 294 err = musb_queue_resume_work(musb, dsps_check_status, NULL); 295 if (err < 0) 296 dev_err(dev, "%s resume work: %i\n", __func__, err); 297 spin_unlock_irqrestore(&musb->lock, flags); 298 pm_runtime_mark_last_busy(dev); 299 pm_runtime_put_autosuspend(dev); 300 } 301 302 static void dsps_musb_clear_ep_rxintr(struct musb *musb, int epnum) 303 { 304 u32 epintr; 305 struct dsps_glue *glue = dev_get_drvdata(musb->controller->parent); 306 const struct dsps_musb_wrapper *wrp = glue->wrp; 307 308 /* musb->lock might already been held */ 309 epintr = (1 << epnum) << wrp->rxep_shift; 310 musb_writel(musb->ctrl_base, wrp->epintr_status, epintr); 311 } 312 313 static irqreturn_t dsps_interrupt(int irq, void *hci) 314 { 315 struct musb *musb = hci; 316 void __iomem *reg_base = musb->ctrl_base; 317 struct device *dev = musb->controller; 318 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 319 const struct dsps_musb_wrapper *wrp = glue->wrp; 320 unsigned long flags; 321 irqreturn_t ret = IRQ_NONE; 322 u32 epintr, usbintr; 323 324 spin_lock_irqsave(&musb->lock, flags); 325 326 /* Get endpoint interrupts */ 327 epintr = musb_readl(reg_base, wrp->epintr_status); 328 musb->int_rx = (epintr & wrp->rxep_bitmap) >> wrp->rxep_shift; 329 musb->int_tx = (epintr & wrp->txep_bitmap) >> wrp->txep_shift; 330 331 if (epintr) 332 musb_writel(reg_base, wrp->epintr_status, epintr); 333 334 /* Get usb core interrupts */ 335 usbintr = musb_readl(reg_base, wrp->coreintr_status); 336 if (!usbintr && !epintr) 337 goto out; 338 339 musb->int_usb = (usbintr & wrp->usb_bitmap) >> wrp->usb_shift; 340 if (usbintr) 341 musb_writel(reg_base, wrp->coreintr_status, usbintr); 342 343 dev_dbg(musb->controller, "usbintr (%x) epintr(%x)\n", 344 usbintr, epintr); 345 346 if (usbintr & ((1 << wrp->drvvbus) << wrp->usb_shift)) { 347 int drvvbus = musb_readl(reg_base, wrp->status); 348 void __iomem *mregs = musb->mregs; 349 u8 devctl = musb_readb(mregs, MUSB_DEVCTL); 350 int err; 351 352 err = musb->int_usb & MUSB_INTR_VBUSERROR; 353 if (err) { 354 /* 355 * The Mentor core doesn't debounce VBUS as needed 356 * to cope with device connect current spikes. This 357 * means it's not uncommon for bus-powered devices 358 * to get VBUS errors during enumeration. 359 * 360 * This is a workaround, but newer RTL from Mentor 361 * seems to allow a better one: "re"-starting sessions 362 * without waiting for VBUS to stop registering in 363 * devctl. 364 */ 365 musb->int_usb &= ~MUSB_INTR_VBUSERROR; 366 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL; 367 dsps_mod_timer_optional(glue); 368 WARNING("VBUS error workaround (delay coming)\n"); 369 } else if (drvvbus) { 370 MUSB_HST_MODE(musb); 371 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; 372 dsps_mod_timer_optional(glue); 373 } else { 374 musb->is_active = 0; 375 MUSB_DEV_MODE(musb); 376 musb->xceiv->otg->state = OTG_STATE_B_IDLE; 377 } 378 379 /* NOTE: this must complete power-on within 100 ms. */ 380 dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n", 381 drvvbus ? "on" : "off", 382 usb_otg_state_string(musb->xceiv->otg->state), 383 err ? " ERROR" : "", 384 devctl); 385 ret = IRQ_HANDLED; 386 } 387 388 if (musb->int_tx || musb->int_rx || musb->int_usb) 389 ret |= musb_interrupt(musb); 390 391 /* Poll for ID change and connect */ 392 switch (musb->xceiv->otg->state) { 393 case OTG_STATE_B_IDLE: 394 case OTG_STATE_A_WAIT_BCON: 395 dsps_mod_timer_optional(glue); 396 break; 397 default: 398 break; 399 } 400 401 out: 402 spin_unlock_irqrestore(&musb->lock, flags); 403 404 return ret; 405 } 406 407 static int dsps_musb_dbg_init(struct musb *musb, struct dsps_glue *glue) 408 { 409 struct dentry *root; 410 char buf[128]; 411 412 sprintf(buf, "%s.dsps", dev_name(musb->controller)); 413 root = debugfs_create_dir(buf, usb_debug_root); 414 glue->dbgfs_root = root; 415 416 glue->regset.regs = dsps_musb_regs; 417 glue->regset.nregs = ARRAY_SIZE(dsps_musb_regs); 418 glue->regset.base = musb->ctrl_base; 419 420 debugfs_create_regset32("regdump", S_IRUGO, root, &glue->regset); 421 return 0; 422 } 423 424 static int dsps_musb_init(struct musb *musb) 425 { 426 struct device *dev = musb->controller; 427 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 428 struct platform_device *parent = to_platform_device(dev->parent); 429 const struct dsps_musb_wrapper *wrp = glue->wrp; 430 void __iomem *reg_base; 431 struct resource *r; 432 u32 rev, val; 433 int ret; 434 435 r = platform_get_resource_byname(parent, IORESOURCE_MEM, "control"); 436 reg_base = devm_ioremap_resource(dev, r); 437 if (IS_ERR(reg_base)) 438 return PTR_ERR(reg_base); 439 musb->ctrl_base = reg_base; 440 441 /* NOP driver needs change if supporting dual instance */ 442 musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent, "phys", 0); 443 if (IS_ERR(musb->xceiv)) 444 return PTR_ERR(musb->xceiv); 445 446 musb->phy = devm_phy_get(dev->parent, "usb2-phy"); 447 448 /* Returns zero if e.g. not clocked */ 449 rev = musb_readl(reg_base, wrp->revision); 450 if (!rev) 451 return -ENODEV; 452 453 if (IS_ERR(musb->phy)) { 454 musb->phy = NULL; 455 } else { 456 ret = phy_init(musb->phy); 457 if (ret < 0) 458 return ret; 459 ret = phy_power_on(musb->phy); 460 if (ret) { 461 phy_exit(musb->phy); 462 return ret; 463 } 464 } 465 466 timer_setup(&musb->dev_timer, otg_timer, 0); 467 468 /* Reset the musb */ 469 musb_writel(reg_base, wrp->control, (1 << wrp->reset)); 470 471 musb->isr = dsps_interrupt; 472 473 /* reset the otgdisable bit, needed for host mode to work */ 474 val = musb_readl(reg_base, wrp->phy_utmi); 475 val &= ~(1 << wrp->otg_disable); 476 musb_writel(musb->ctrl_base, wrp->phy_utmi, val); 477 478 /* 479 * Check whether the dsps version has babble control enabled. 480 * In latest silicon revision the babble control logic is enabled. 481 * If MUSB_BABBLE_CTL returns 0x4 then we have the babble control 482 * logic enabled. 483 */ 484 val = musb_readb(musb->mregs, MUSB_BABBLE_CTL); 485 if (val & MUSB_BABBLE_RCV_DISABLE) { 486 glue->sw_babble_enabled = true; 487 val |= MUSB_BABBLE_SW_SESSION_CTRL; 488 musb_writeb(musb->mregs, MUSB_BABBLE_CTL, val); 489 } 490 491 dsps_mod_timer(glue, -1); 492 493 return dsps_musb_dbg_init(musb, glue); 494 } 495 496 static int dsps_musb_exit(struct musb *musb) 497 { 498 struct device *dev = musb->controller; 499 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 500 501 del_timer_sync(&musb->dev_timer); 502 phy_power_off(musb->phy); 503 phy_exit(musb->phy); 504 debugfs_remove_recursive(glue->dbgfs_root); 505 506 return 0; 507 } 508 509 static int dsps_musb_set_mode(struct musb *musb, u8 mode) 510 { 511 struct device *dev = musb->controller; 512 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 513 const struct dsps_musb_wrapper *wrp = glue->wrp; 514 void __iomem *ctrl_base = musb->ctrl_base; 515 u32 reg; 516 517 reg = musb_readl(ctrl_base, wrp->mode); 518 519 switch (mode) { 520 case MUSB_HOST: 521 reg &= ~(1 << wrp->iddig); 522 523 /* 524 * if we're setting mode to host-only or device-only, we're 525 * going to ignore whatever the PHY sends us and just force 526 * ID pin status by SW 527 */ 528 reg |= (1 << wrp->iddig_mux); 529 530 musb_writel(ctrl_base, wrp->mode, reg); 531 musb_writel(ctrl_base, wrp->phy_utmi, 0x02); 532 break; 533 case MUSB_PERIPHERAL: 534 reg |= (1 << wrp->iddig); 535 536 /* 537 * if we're setting mode to host-only or device-only, we're 538 * going to ignore whatever the PHY sends us and just force 539 * ID pin status by SW 540 */ 541 reg |= (1 << wrp->iddig_mux); 542 543 musb_writel(ctrl_base, wrp->mode, reg); 544 break; 545 case MUSB_OTG: 546 musb_writel(ctrl_base, wrp->phy_utmi, 0x02); 547 break; 548 default: 549 dev_err(glue->dev, "unsupported mode %d\n", mode); 550 return -EINVAL; 551 } 552 553 return 0; 554 } 555 556 static bool dsps_sw_babble_control(struct musb *musb) 557 { 558 u8 babble_ctl; 559 bool session_restart = false; 560 561 babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL); 562 dev_dbg(musb->controller, "babble: MUSB_BABBLE_CTL value %x\n", 563 babble_ctl); 564 /* 565 * check line monitor flag to check whether babble is 566 * due to noise 567 */ 568 dev_dbg(musb->controller, "STUCK_J is %s\n", 569 babble_ctl & MUSB_BABBLE_STUCK_J ? "set" : "reset"); 570 571 if (babble_ctl & MUSB_BABBLE_STUCK_J) { 572 int timeout = 10; 573 574 /* 575 * babble is due to noise, then set transmit idle (d7 bit) 576 * to resume normal operation 577 */ 578 babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL); 579 babble_ctl |= MUSB_BABBLE_FORCE_TXIDLE; 580 musb_writeb(musb->mregs, MUSB_BABBLE_CTL, babble_ctl); 581 582 /* wait till line monitor flag cleared */ 583 dev_dbg(musb->controller, "Set TXIDLE, wait J to clear\n"); 584 do { 585 babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL); 586 udelay(1); 587 } while ((babble_ctl & MUSB_BABBLE_STUCK_J) && timeout--); 588 589 /* check whether stuck_at_j bit cleared */ 590 if (babble_ctl & MUSB_BABBLE_STUCK_J) { 591 /* 592 * real babble condition has occurred 593 * restart the controller to start the 594 * session again 595 */ 596 dev_dbg(musb->controller, "J not cleared, misc (%x)\n", 597 babble_ctl); 598 session_restart = true; 599 } 600 } else { 601 session_restart = true; 602 } 603 604 return session_restart; 605 } 606 607 static int dsps_musb_recover(struct musb *musb) 608 { 609 struct device *dev = musb->controller; 610 struct dsps_glue *glue = dev_get_drvdata(dev->parent); 611 int session_restart = 0; 612 613 if (glue->sw_babble_enabled) 614 session_restart = dsps_sw_babble_control(musb); 615 else 616 session_restart = 1; 617 618 return session_restart ? 0 : -EPIPE; 619 } 620 621 /* Similar to am35x, dm81xx support only 32-bit read operation */ 622 static void dsps_read_fifo32(struct musb_hw_ep *hw_ep, u16 len, u8 *dst) 623 { 624 void __iomem *fifo = hw_ep->fifo; 625 626 if (len >= 4) { 627 ioread32_rep(fifo, dst, len >> 2); 628 dst += len & ~0x03; 629 len &= 0x03; 630 } 631 632 /* Read any remaining 1 to 3 bytes */ 633 if (len > 0) { 634 u32 val = musb_readl(fifo, 0); 635 memcpy(dst, &val, len); 636 } 637 } 638 639 #ifdef CONFIG_USB_TI_CPPI41_DMA 640 static void dsps_dma_controller_callback(struct dma_controller *c) 641 { 642 struct musb *musb = c->musb; 643 struct dsps_glue *glue = dev_get_drvdata(musb->controller->parent); 644 void __iomem *usbss_base = glue->usbss_base; 645 u32 status; 646 647 status = musb_readl(usbss_base, USBSS_IRQ_STATUS); 648 if (status & USBSS_IRQ_PD_COMP) 649 musb_writel(usbss_base, USBSS_IRQ_STATUS, USBSS_IRQ_PD_COMP); 650 } 651 652 static struct dma_controller * 653 dsps_dma_controller_create(struct musb *musb, void __iomem *base) 654 { 655 struct dma_controller *controller; 656 struct dsps_glue *glue = dev_get_drvdata(musb->controller->parent); 657 void __iomem *usbss_base = glue->usbss_base; 658 659 controller = cppi41_dma_controller_create(musb, base); 660 if (IS_ERR_OR_NULL(controller)) 661 return controller; 662 663 musb_writel(usbss_base, USBSS_IRQ_ENABLER, USBSS_IRQ_PD_COMP); 664 controller->dma_callback = dsps_dma_controller_callback; 665 666 return controller; 667 } 668 669 #ifdef CONFIG_PM_SLEEP 670 static void dsps_dma_controller_suspend(struct dsps_glue *glue) 671 { 672 void __iomem *usbss_base = glue->usbss_base; 673 674 musb_writel(usbss_base, USBSS_IRQ_CLEARR, USBSS_IRQ_PD_COMP); 675 } 676 677 static void dsps_dma_controller_resume(struct dsps_glue *glue) 678 { 679 void __iomem *usbss_base = glue->usbss_base; 680 681 musb_writel(usbss_base, USBSS_IRQ_ENABLER, USBSS_IRQ_PD_COMP); 682 } 683 #endif 684 #else /* CONFIG_USB_TI_CPPI41_DMA */ 685 #ifdef CONFIG_PM_SLEEP 686 static void dsps_dma_controller_suspend(struct dsps_glue *glue) {} 687 static void dsps_dma_controller_resume(struct dsps_glue *glue) {} 688 #endif 689 #endif /* CONFIG_USB_TI_CPPI41_DMA */ 690 691 static struct musb_platform_ops dsps_ops = { 692 .quirks = MUSB_DMA_CPPI41 | MUSB_INDEXED_EP, 693 .init = dsps_musb_init, 694 .exit = dsps_musb_exit, 695 696 #ifdef CONFIG_USB_TI_CPPI41_DMA 697 .dma_init = dsps_dma_controller_create, 698 .dma_exit = cppi41_dma_controller_destroy, 699 #endif 700 .enable = dsps_musb_enable, 701 .disable = dsps_musb_disable, 702 703 .set_mode = dsps_musb_set_mode, 704 .recover = dsps_musb_recover, 705 .clear_ep_rxintr = dsps_musb_clear_ep_rxintr, 706 }; 707 708 static u64 musb_dmamask = DMA_BIT_MASK(32); 709 710 static int get_int_prop(struct device_node *dn, const char *s) 711 { 712 int ret; 713 u32 val; 714 715 ret = of_property_read_u32(dn, s, &val); 716 if (ret) 717 return 0; 718 return val; 719 } 720 721 static int dsps_create_musb_pdev(struct dsps_glue *glue, 722 struct platform_device *parent) 723 { 724 struct musb_hdrc_platform_data pdata; 725 struct resource resources[2]; 726 struct resource *res; 727 struct device *dev = &parent->dev; 728 struct musb_hdrc_config *config; 729 struct platform_device *musb; 730 struct device_node *dn = parent->dev.of_node; 731 int ret, val; 732 733 memset(resources, 0, sizeof(resources)); 734 res = platform_get_resource_byname(parent, IORESOURCE_MEM, "mc"); 735 if (!res) { 736 dev_err(dev, "failed to get memory.\n"); 737 return -EINVAL; 738 } 739 resources[0] = *res; 740 741 ret = platform_get_irq_byname(parent, "mc"); 742 if (ret < 0) 743 return ret; 744 745 resources[1].start = ret; 746 resources[1].end = ret; 747 resources[1].flags = IORESOURCE_IRQ | irq_get_trigger_type(ret); 748 resources[1].name = "mc"; 749 750 /* allocate the child platform device */ 751 musb = platform_device_alloc("musb-hdrc", 752 (resources[0].start & 0xFFF) == 0x400 ? 0 : 1); 753 if (!musb) { 754 dev_err(dev, "failed to allocate musb device\n"); 755 return -ENOMEM; 756 } 757 758 musb->dev.parent = dev; 759 musb->dev.dma_mask = &musb_dmamask; 760 musb->dev.coherent_dma_mask = musb_dmamask; 761 device_set_of_node_from_dev(&musb->dev, &parent->dev); 762 763 glue->musb = musb; 764 765 ret = platform_device_add_resources(musb, resources, 766 ARRAY_SIZE(resources)); 767 if (ret) { 768 dev_err(dev, "failed to add resources\n"); 769 goto err; 770 } 771 772 config = devm_kzalloc(&parent->dev, sizeof(*config), GFP_KERNEL); 773 if (!config) { 774 ret = -ENOMEM; 775 goto err; 776 } 777 pdata.config = config; 778 pdata.platform_ops = &dsps_ops; 779 780 config->num_eps = get_int_prop(dn, "mentor,num-eps"); 781 config->ram_bits = get_int_prop(dn, "mentor,ram-bits"); 782 config->host_port_deassert_reset_at_resume = 1; 783 pdata.mode = musb_get_mode(dev); 784 /* DT keeps this entry in mA, musb expects it as per USB spec */ 785 pdata.power = get_int_prop(dn, "mentor,power") / 2; 786 787 ret = of_property_read_u32(dn, "mentor,multipoint", &val); 788 if (!ret && val) 789 config->multipoint = true; 790 791 config->maximum_speed = usb_get_maximum_speed(&parent->dev); 792 switch (config->maximum_speed) { 793 case USB_SPEED_LOW: 794 case USB_SPEED_FULL: 795 break; 796 case USB_SPEED_SUPER: 797 dev_warn(dev, "ignore incorrect maximum_speed " 798 "(super-speed) setting in dts"); 799 fallthrough; 800 default: 801 config->maximum_speed = USB_SPEED_HIGH; 802 } 803 804 ret = platform_device_add_data(musb, &pdata, sizeof(pdata)); 805 if (ret) { 806 dev_err(dev, "failed to add platform_data\n"); 807 goto err; 808 } 809 810 ret = platform_device_add(musb); 811 if (ret) { 812 dev_err(dev, "failed to register musb device\n"); 813 goto err; 814 } 815 return 0; 816 817 err: 818 platform_device_put(musb); 819 return ret; 820 } 821 822 static irqreturn_t dsps_vbus_threaded_irq(int irq, void *priv) 823 { 824 struct dsps_glue *glue = priv; 825 struct musb *musb = platform_get_drvdata(glue->musb); 826 827 if (!musb) 828 return IRQ_NONE; 829 830 dev_dbg(glue->dev, "VBUS interrupt\n"); 831 dsps_mod_timer(glue, 0); 832 833 return IRQ_HANDLED; 834 } 835 836 static int dsps_setup_optional_vbus_irq(struct platform_device *pdev, 837 struct dsps_glue *glue) 838 { 839 int error; 840 841 glue->vbus_irq = platform_get_irq_byname(pdev, "vbus"); 842 if (glue->vbus_irq == -EPROBE_DEFER) 843 return -EPROBE_DEFER; 844 845 if (glue->vbus_irq <= 0) { 846 glue->vbus_irq = 0; 847 return 0; 848 } 849 850 error = devm_request_threaded_irq(glue->dev, glue->vbus_irq, 851 NULL, dsps_vbus_threaded_irq, 852 IRQF_SHARED, 853 "vbus", glue); 854 if (error) { 855 glue->vbus_irq = 0; 856 return error; 857 } 858 dev_dbg(glue->dev, "VBUS irq %i configured\n", glue->vbus_irq); 859 860 return 0; 861 } 862 863 static int dsps_probe(struct platform_device *pdev) 864 { 865 const struct of_device_id *match; 866 const struct dsps_musb_wrapper *wrp; 867 struct dsps_glue *glue; 868 int ret; 869 870 if (!strcmp(pdev->name, "musb-hdrc")) 871 return -ENODEV; 872 873 match = of_match_node(musb_dsps_of_match, pdev->dev.of_node); 874 if (!match) { 875 dev_err(&pdev->dev, "fail to get matching of_match struct\n"); 876 return -EINVAL; 877 } 878 wrp = match->data; 879 880 if (of_device_is_compatible(pdev->dev.of_node, "ti,musb-dm816")) 881 dsps_ops.read_fifo = dsps_read_fifo32; 882 883 /* allocate glue */ 884 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); 885 if (!glue) 886 return -ENOMEM; 887 888 glue->dev = &pdev->dev; 889 glue->wrp = wrp; 890 glue->usbss_base = of_iomap(pdev->dev.parent->of_node, 0); 891 if (!glue->usbss_base) 892 return -ENXIO; 893 894 platform_set_drvdata(pdev, glue); 895 pm_runtime_enable(&pdev->dev); 896 ret = dsps_create_musb_pdev(glue, pdev); 897 if (ret) 898 goto err; 899 900 if (usb_get_dr_mode(&pdev->dev) == USB_DR_MODE_PERIPHERAL) { 901 ret = dsps_setup_optional_vbus_irq(pdev, glue); 902 if (ret) 903 goto unregister_pdev; 904 } 905 906 return 0; 907 908 unregister_pdev: 909 platform_device_unregister(glue->musb); 910 err: 911 pm_runtime_disable(&pdev->dev); 912 iounmap(glue->usbss_base); 913 return ret; 914 } 915 916 static void dsps_remove(struct platform_device *pdev) 917 { 918 struct dsps_glue *glue = platform_get_drvdata(pdev); 919 920 platform_device_unregister(glue->musb); 921 922 pm_runtime_disable(&pdev->dev); 923 iounmap(glue->usbss_base); 924 } 925 926 static const struct dsps_musb_wrapper am33xx_driver_data = { 927 .revision = 0x00, 928 .control = 0x14, 929 .status = 0x18, 930 .epintr_set = 0x38, 931 .epintr_clear = 0x40, 932 .epintr_status = 0x30, 933 .coreintr_set = 0x3c, 934 .coreintr_clear = 0x44, 935 .coreintr_status = 0x34, 936 .phy_utmi = 0xe0, 937 .mode = 0xe8, 938 .tx_mode = 0x70, 939 .rx_mode = 0x74, 940 .reset = 0, 941 .otg_disable = 21, 942 .iddig = 8, 943 .iddig_mux = 7, 944 .usb_shift = 0, 945 .usb_mask = 0x1ff, 946 .usb_bitmap = (0x1ff << 0), 947 .drvvbus = 8, 948 .txep_shift = 0, 949 .txep_mask = 0xffff, 950 .txep_bitmap = (0xffff << 0), 951 .rxep_shift = 16, 952 .rxep_mask = 0xfffe, 953 .rxep_bitmap = (0xfffe << 16), 954 .poll_timeout = 2000, /* ms */ 955 }; 956 957 static const struct of_device_id musb_dsps_of_match[] = { 958 { .compatible = "ti,musb-am33xx", 959 .data = &am33xx_driver_data, }, 960 { .compatible = "ti,musb-dm816", 961 .data = &am33xx_driver_data, }, 962 { }, 963 }; 964 MODULE_DEVICE_TABLE(of, musb_dsps_of_match); 965 966 #ifdef CONFIG_PM_SLEEP 967 static int dsps_suspend(struct device *dev) 968 { 969 struct dsps_glue *glue = dev_get_drvdata(dev); 970 const struct dsps_musb_wrapper *wrp = glue->wrp; 971 struct musb *musb = platform_get_drvdata(glue->musb); 972 void __iomem *mbase; 973 int ret; 974 975 if (!musb) 976 /* This can happen if the musb device is in -EPROBE_DEFER */ 977 return 0; 978 979 ret = pm_runtime_get_sync(dev); 980 if (ret < 0) { 981 pm_runtime_put_noidle(dev); 982 return ret; 983 } 984 985 del_timer_sync(&musb->dev_timer); 986 987 mbase = musb->ctrl_base; 988 glue->context.control = musb_readl(mbase, wrp->control); 989 glue->context.epintr = musb_readl(mbase, wrp->epintr_set); 990 glue->context.coreintr = musb_readl(mbase, wrp->coreintr_set); 991 glue->context.phy_utmi = musb_readl(mbase, wrp->phy_utmi); 992 glue->context.mode = musb_readl(mbase, wrp->mode); 993 glue->context.tx_mode = musb_readl(mbase, wrp->tx_mode); 994 glue->context.rx_mode = musb_readl(mbase, wrp->rx_mode); 995 996 dsps_dma_controller_suspend(glue); 997 998 return 0; 999 } 1000 1001 static int dsps_resume(struct device *dev) 1002 { 1003 struct dsps_glue *glue = dev_get_drvdata(dev); 1004 const struct dsps_musb_wrapper *wrp = glue->wrp; 1005 struct musb *musb = platform_get_drvdata(glue->musb); 1006 void __iomem *mbase; 1007 1008 if (!musb) 1009 return 0; 1010 1011 dsps_dma_controller_resume(glue); 1012 1013 mbase = musb->ctrl_base; 1014 musb_writel(mbase, wrp->control, glue->context.control); 1015 musb_writel(mbase, wrp->epintr_set, glue->context.epintr); 1016 musb_writel(mbase, wrp->coreintr_set, glue->context.coreintr); 1017 musb_writel(mbase, wrp->phy_utmi, glue->context.phy_utmi); 1018 musb_writel(mbase, wrp->mode, glue->context.mode); 1019 musb_writel(mbase, wrp->tx_mode, glue->context.tx_mode); 1020 musb_writel(mbase, wrp->rx_mode, glue->context.rx_mode); 1021 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE && 1022 musb->port_mode == MUSB_OTG) 1023 dsps_mod_timer(glue, -1); 1024 1025 pm_runtime_put(dev); 1026 1027 return 0; 1028 } 1029 #endif 1030 1031 static SIMPLE_DEV_PM_OPS(dsps_pm_ops, dsps_suspend, dsps_resume); 1032 1033 static struct platform_driver dsps_usbss_driver = { 1034 .probe = dsps_probe, 1035 .remove_new = dsps_remove, 1036 .driver = { 1037 .name = "musb-dsps", 1038 .pm = &dsps_pm_ops, 1039 .of_match_table = musb_dsps_of_match, 1040 }, 1041 }; 1042 1043 MODULE_DESCRIPTION("TI DSPS MUSB Glue Layer"); 1044 MODULE_AUTHOR("Ravi B <ravibabu@ti.com>"); 1045 MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>"); 1046 MODULE_LICENSE("GPL v2"); 1047 1048 module_platform_driver(dsps_usbss_driver); 1049