1 /* 2 * Texas Instruments AM35x "glue layer" 3 * 4 * Copyright (c) 2010, by Texas Instruments 5 * 6 * Based on the DA8xx "glue layer" code. 7 * Copyright (c) 2008-2009, MontaVista Software, Inc. <source@mvista.com> 8 * 9 * This file is part of the Inventra Controller Driver for Linux. 10 * 11 * SPDX-License-Identifier: GPL-2.0 12 * 13 */ 14 15 #ifndef __UBOOT__ 16 #include <linux/init.h> 17 #include <linux/module.h> 18 #include <linux/clk.h> 19 #include <linux/err.h> 20 #include <linux/io.h> 21 #include <linux/platform_device.h> 22 #include <linux/dma-mapping.h> 23 24 #include <plat/usb.h> 25 #else 26 #include <common.h> 27 #include <asm/omap_musb.h> 28 #include "linux-compat.h" 29 #endif 30 31 #include "musb_core.h" 32 33 /* 34 * AM35x specific definitions 35 */ 36 /* USB 2.0 OTG module registers */ 37 #define USB_REVISION_REG 0x00 38 #define USB_CTRL_REG 0x04 39 #define USB_STAT_REG 0x08 40 #define USB_EMULATION_REG 0x0c 41 /* 0x10 Reserved */ 42 #define USB_AUTOREQ_REG 0x14 43 #define USB_SRP_FIX_TIME_REG 0x18 44 #define USB_TEARDOWN_REG 0x1c 45 #define EP_INTR_SRC_REG 0x20 46 #define EP_INTR_SRC_SET_REG 0x24 47 #define EP_INTR_SRC_CLEAR_REG 0x28 48 #define EP_INTR_MASK_REG 0x2c 49 #define EP_INTR_MASK_SET_REG 0x30 50 #define EP_INTR_MASK_CLEAR_REG 0x34 51 #define EP_INTR_SRC_MASKED_REG 0x38 52 #define CORE_INTR_SRC_REG 0x40 53 #define CORE_INTR_SRC_SET_REG 0x44 54 #define CORE_INTR_SRC_CLEAR_REG 0x48 55 #define CORE_INTR_MASK_REG 0x4c 56 #define CORE_INTR_MASK_SET_REG 0x50 57 #define CORE_INTR_MASK_CLEAR_REG 0x54 58 #define CORE_INTR_SRC_MASKED_REG 0x58 59 /* 0x5c Reserved */ 60 #define USB_END_OF_INTR_REG 0x60 61 62 /* Control register bits */ 63 #define AM35X_SOFT_RESET_MASK 1 64 65 /* USB interrupt register bits */ 66 #define AM35X_INTR_USB_SHIFT 16 67 #define AM35X_INTR_USB_MASK (0x1ff << AM35X_INTR_USB_SHIFT) 68 #define AM35X_INTR_DRVVBUS 0x100 69 #define AM35X_INTR_RX_SHIFT 16 70 #define AM35X_INTR_TX_SHIFT 0 71 #define AM35X_TX_EP_MASK 0xffff /* EP0 + 15 Tx EPs */ 72 #define AM35X_RX_EP_MASK 0xfffe /* 15 Rx EPs */ 73 #define AM35X_TX_INTR_MASK (AM35X_TX_EP_MASK << AM35X_INTR_TX_SHIFT) 74 #define AM35X_RX_INTR_MASK (AM35X_RX_EP_MASK << AM35X_INTR_RX_SHIFT) 75 76 #define USB_MENTOR_CORE_OFFSET 0x400 77 78 struct am35x_glue { 79 struct device *dev; 80 struct platform_device *musb; 81 struct clk *phy_clk; 82 struct clk *clk; 83 }; 84 #define glue_to_musb(g) platform_get_drvdata(g->musb) 85 86 /* 87 * am35x_musb_enable - enable interrupts 88 */ 89 #ifndef __UBOOT__ 90 static void am35x_musb_enable(struct musb *musb) 91 #else 92 static int am35x_musb_enable(struct musb *musb) 93 #endif 94 { 95 void __iomem *reg_base = musb->ctrl_base; 96 u32 epmask; 97 98 /* Workaround: setup IRQs through both register sets. */ 99 epmask = ((musb->epmask & AM35X_TX_EP_MASK) << AM35X_INTR_TX_SHIFT) | 100 ((musb->epmask & AM35X_RX_EP_MASK) << AM35X_INTR_RX_SHIFT); 101 102 musb_writel(reg_base, EP_INTR_MASK_SET_REG, epmask); 103 musb_writel(reg_base, CORE_INTR_MASK_SET_REG, AM35X_INTR_USB_MASK); 104 105 /* Force the DRVVBUS IRQ so we can start polling for ID change. */ 106 if (is_otg_enabled(musb)) 107 musb_writel(reg_base, CORE_INTR_SRC_SET_REG, 108 AM35X_INTR_DRVVBUS << AM35X_INTR_USB_SHIFT); 109 #ifdef __UBOOT__ 110 return 0; 111 #endif 112 } 113 114 /* 115 * am35x_musb_disable - disable HDRC and flush interrupts 116 */ 117 static void am35x_musb_disable(struct musb *musb) 118 { 119 void __iomem *reg_base = musb->ctrl_base; 120 121 musb_writel(reg_base, CORE_INTR_MASK_CLEAR_REG, AM35X_INTR_USB_MASK); 122 musb_writel(reg_base, EP_INTR_MASK_CLEAR_REG, 123 AM35X_TX_INTR_MASK | AM35X_RX_INTR_MASK); 124 musb_writeb(musb->mregs, MUSB_DEVCTL, 0); 125 musb_writel(reg_base, USB_END_OF_INTR_REG, 0); 126 } 127 128 #ifndef __UBOOT__ 129 #define portstate(stmt) stmt 130 131 static void am35x_musb_set_vbus(struct musb *musb, int is_on) 132 { 133 WARN_ON(is_on && is_peripheral_active(musb)); 134 } 135 136 #define POLL_SECONDS 2 137 138 static struct timer_list otg_workaround; 139 140 static void otg_timer(unsigned long _musb) 141 { 142 struct musb *musb = (void *)_musb; 143 void __iomem *mregs = musb->mregs; 144 u8 devctl; 145 unsigned long flags; 146 147 /* 148 * We poll because AM35x's won't expose several OTG-critical 149 * status change events (from the transceiver) otherwise. 150 */ 151 devctl = musb_readb(mregs, MUSB_DEVCTL); 152 dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl, 153 otg_state_string(musb->xceiv->state)); 154 155 spin_lock_irqsave(&musb->lock, flags); 156 switch (musb->xceiv->state) { 157 case OTG_STATE_A_WAIT_BCON: 158 devctl &= ~MUSB_DEVCTL_SESSION; 159 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 160 161 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 162 if (devctl & MUSB_DEVCTL_BDEVICE) { 163 musb->xceiv->state = OTG_STATE_B_IDLE; 164 MUSB_DEV_MODE(musb); 165 } else { 166 musb->xceiv->state = OTG_STATE_A_IDLE; 167 MUSB_HST_MODE(musb); 168 } 169 break; 170 case OTG_STATE_A_WAIT_VFALL: 171 musb->xceiv->state = OTG_STATE_A_WAIT_VRISE; 172 musb_writel(musb->ctrl_base, CORE_INTR_SRC_SET_REG, 173 MUSB_INTR_VBUSERROR << AM35X_INTR_USB_SHIFT); 174 break; 175 case OTG_STATE_B_IDLE: 176 if (!is_peripheral_enabled(musb)) 177 break; 178 179 devctl = musb_readb(mregs, MUSB_DEVCTL); 180 if (devctl & MUSB_DEVCTL_BDEVICE) 181 mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ); 182 else 183 musb->xceiv->state = OTG_STATE_A_IDLE; 184 break; 185 default: 186 break; 187 } 188 spin_unlock_irqrestore(&musb->lock, flags); 189 } 190 191 static void am35x_musb_try_idle(struct musb *musb, unsigned long timeout) 192 { 193 static unsigned long last_timer; 194 195 if (!is_otg_enabled(musb)) 196 return; 197 198 if (timeout == 0) 199 timeout = jiffies + msecs_to_jiffies(3); 200 201 /* Never idle if active, or when VBUS timeout is not set as host */ 202 if (musb->is_active || (musb->a_wait_bcon == 0 && 203 musb->xceiv->state == OTG_STATE_A_WAIT_BCON)) { 204 dev_dbg(musb->controller, "%s active, deleting timer\n", 205 otg_state_string(musb->xceiv->state)); 206 del_timer(&otg_workaround); 207 last_timer = jiffies; 208 return; 209 } 210 211 if (time_after(last_timer, timeout) && timer_pending(&otg_workaround)) { 212 dev_dbg(musb->controller, "Longer idle timer already pending, ignoring...\n"); 213 return; 214 } 215 last_timer = timeout; 216 217 dev_dbg(musb->controller, "%s inactive, starting idle timer for %u ms\n", 218 otg_state_string(musb->xceiv->state), 219 jiffies_to_msecs(timeout - jiffies)); 220 mod_timer(&otg_workaround, timeout); 221 } 222 #endif 223 224 static irqreturn_t am35x_musb_interrupt(int irq, void *hci) 225 { 226 struct musb *musb = hci; 227 void __iomem *reg_base = musb->ctrl_base; 228 #ifndef __UBOOT__ 229 struct device *dev = musb->controller; 230 struct musb_hdrc_platform_data *plat = dev->platform_data; 231 struct omap_musb_board_data *data = plat->board_data; 232 struct usb_otg *otg = musb->xceiv->otg; 233 #else 234 struct omap_musb_board_data *data = 235 (struct omap_musb_board_data *)musb->controller; 236 #endif 237 unsigned long flags; 238 irqreturn_t ret = IRQ_NONE; 239 u32 epintr, usbintr; 240 241 #ifdef __UBOOT__ 242 /* 243 * It seems that on AM35X interrupt registers can be updated 244 * before core registers. This confuses the code. 245 * As a workaround add a small delay here. 246 */ 247 udelay(10); 248 #endif 249 spin_lock_irqsave(&musb->lock, flags); 250 251 /* Get endpoint interrupts */ 252 epintr = musb_readl(reg_base, EP_INTR_SRC_MASKED_REG); 253 254 if (epintr) { 255 musb_writel(reg_base, EP_INTR_SRC_CLEAR_REG, epintr); 256 257 musb->int_rx = 258 (epintr & AM35X_RX_INTR_MASK) >> AM35X_INTR_RX_SHIFT; 259 musb->int_tx = 260 (epintr & AM35X_TX_INTR_MASK) >> AM35X_INTR_TX_SHIFT; 261 } 262 263 /* Get usb core interrupts */ 264 usbintr = musb_readl(reg_base, CORE_INTR_SRC_MASKED_REG); 265 if (!usbintr && !epintr) 266 goto eoi; 267 268 if (usbintr) { 269 musb_writel(reg_base, CORE_INTR_SRC_CLEAR_REG, usbintr); 270 271 musb->int_usb = 272 (usbintr & AM35X_INTR_USB_MASK) >> AM35X_INTR_USB_SHIFT; 273 } 274 #ifndef __UBOOT__ 275 /* 276 * DRVVBUS IRQs are the only proxy we have (a very poor one!) for 277 * AM35x's missing ID change IRQ. We need an ID change IRQ to 278 * switch appropriately between halves of the OTG state machine. 279 * Managing DEVCTL.SESSION per Mentor docs requires that we know its 280 * value but DEVCTL.BDEVICE is invalid without DEVCTL.SESSION set. 281 * Also, DRVVBUS pulses for SRP (but not at 5V) ... 282 */ 283 if (usbintr & (AM35X_INTR_DRVVBUS << AM35X_INTR_USB_SHIFT)) { 284 int drvvbus = musb_readl(reg_base, USB_STAT_REG); 285 void __iomem *mregs = musb->mregs; 286 u8 devctl = musb_readb(mregs, MUSB_DEVCTL); 287 int err; 288 289 err = is_host_enabled(musb) && (musb->int_usb & 290 MUSB_INTR_VBUSERROR); 291 if (err) { 292 /* 293 * The Mentor core doesn't debounce VBUS as needed 294 * to cope with device connect current spikes. This 295 * means it's not uncommon for bus-powered devices 296 * to get VBUS errors during enumeration. 297 * 298 * This is a workaround, but newer RTL from Mentor 299 * seems to allow a better one: "re"-starting sessions 300 * without waiting for VBUS to stop registering in 301 * devctl. 302 */ 303 musb->int_usb &= ~MUSB_INTR_VBUSERROR; 304 musb->xceiv->state = OTG_STATE_A_WAIT_VFALL; 305 mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ); 306 WARNING("VBUS error workaround (delay coming)\n"); 307 } else if (is_host_enabled(musb) && drvvbus) { 308 MUSB_HST_MODE(musb); 309 otg->default_a = 1; 310 musb->xceiv->state = OTG_STATE_A_WAIT_VRISE; 311 portstate(musb->port1_status |= USB_PORT_STAT_POWER); 312 del_timer(&otg_workaround); 313 } else { 314 musb->is_active = 0; 315 MUSB_DEV_MODE(musb); 316 otg->default_a = 0; 317 musb->xceiv->state = OTG_STATE_B_IDLE; 318 portstate(musb->port1_status &= ~USB_PORT_STAT_POWER); 319 } 320 321 /* NOTE: this must complete power-on within 100 ms. */ 322 dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n", 323 drvvbus ? "on" : "off", 324 otg_state_string(musb->xceiv->state), 325 err ? " ERROR" : "", 326 devctl); 327 ret = IRQ_HANDLED; 328 } 329 #endif 330 331 if (musb->int_tx || musb->int_rx || musb->int_usb) 332 ret |= musb_interrupt(musb); 333 334 eoi: 335 /* EOI needs to be written for the IRQ to be re-asserted. */ 336 if (ret == IRQ_HANDLED || epintr || usbintr) { 337 /* clear level interrupt */ 338 if (data->clear_irq) 339 data->clear_irq(); 340 /* write EOI */ 341 musb_writel(reg_base, USB_END_OF_INTR_REG, 0); 342 } 343 344 #ifndef __UBOOT__ 345 /* Poll for ID change */ 346 if (is_otg_enabled(musb) && musb->xceiv->state == OTG_STATE_B_IDLE) 347 mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ); 348 #endif 349 350 spin_unlock_irqrestore(&musb->lock, flags); 351 352 return ret; 353 } 354 355 #ifndef __UBOOT__ 356 static int am35x_musb_set_mode(struct musb *musb, u8 musb_mode) 357 { 358 struct device *dev = musb->controller; 359 struct musb_hdrc_platform_data *plat = dev->platform_data; 360 struct omap_musb_board_data *data = plat->board_data; 361 int retval = 0; 362 363 if (data->set_mode) 364 data->set_mode(musb_mode); 365 else 366 retval = -EIO; 367 368 return retval; 369 } 370 #endif 371 372 static int am35x_musb_init(struct musb *musb) 373 { 374 #ifndef __UBOOT__ 375 struct device *dev = musb->controller; 376 struct musb_hdrc_platform_data *plat = dev->platform_data; 377 struct omap_musb_board_data *data = plat->board_data; 378 #else 379 struct omap_musb_board_data *data = 380 (struct omap_musb_board_data *)musb->controller; 381 #endif 382 void __iomem *reg_base = musb->ctrl_base; 383 u32 rev; 384 385 musb->mregs += USB_MENTOR_CORE_OFFSET; 386 387 /* Returns zero if e.g. not clocked */ 388 rev = musb_readl(reg_base, USB_REVISION_REG); 389 if (!rev) 390 return -ENODEV; 391 392 #ifndef __UBOOT__ 393 usb_nop_xceiv_register(); 394 musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2); 395 if (IS_ERR_OR_NULL(musb->xceiv)) 396 return -ENODEV; 397 398 if (is_host_enabled(musb)) 399 setup_timer(&otg_workaround, otg_timer, (unsigned long) musb); 400 #endif 401 402 /* Reset the musb */ 403 if (data->reset) 404 data->reset(); 405 406 /* Reset the controller */ 407 musb_writel(reg_base, USB_CTRL_REG, AM35X_SOFT_RESET_MASK); 408 409 /* Start the on-chip PHY and its PLL. */ 410 if (data->set_phy_power) 411 data->set_phy_power(1); 412 413 msleep(5); 414 415 musb->isr = am35x_musb_interrupt; 416 417 /* clear level interrupt */ 418 if (data->clear_irq) 419 data->clear_irq(); 420 421 return 0; 422 } 423 424 static int am35x_musb_exit(struct musb *musb) 425 { 426 #ifndef __UBOOT__ 427 struct device *dev = musb->controller; 428 struct musb_hdrc_platform_data *plat = dev->platform_data; 429 struct omap_musb_board_data *data = plat->board_data; 430 #else 431 struct omap_musb_board_data *data = 432 (struct omap_musb_board_data *)musb->controller; 433 #endif 434 435 #ifndef __UBOOT__ 436 if (is_host_enabled(musb)) 437 del_timer_sync(&otg_workaround); 438 #endif 439 440 /* Shutdown the on-chip PHY and its PLL. */ 441 if (data->set_phy_power) 442 data->set_phy_power(0); 443 444 #ifndef __UBOOT__ 445 usb_put_phy(musb->xceiv); 446 usb_nop_xceiv_unregister(); 447 #endif 448 449 return 0; 450 } 451 452 /* AM35x supports only 32bit read operation */ 453 void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst) 454 { 455 void __iomem *fifo = hw_ep->fifo; 456 u32 val; 457 int i; 458 459 /* Read for 32bit-aligned destination address */ 460 if (likely((0x03 & (unsigned long) dst) == 0) && len >= 4) { 461 readsl(fifo, dst, len >> 2); 462 dst += len & ~0x03; 463 len &= 0x03; 464 } 465 /* 466 * Now read the remaining 1 to 3 byte or complete length if 467 * unaligned address. 468 */ 469 if (len > 4) { 470 for (i = 0; i < (len >> 2); i++) { 471 *(u32 *) dst = musb_readl(fifo, 0); 472 dst += 4; 473 } 474 len &= 0x03; 475 } 476 if (len > 0) { 477 val = musb_readl(fifo, 0); 478 memcpy(dst, &val, len); 479 } 480 } 481 482 #ifndef __UBOOT__ 483 static const struct musb_platform_ops am35x_ops = { 484 #else 485 const struct musb_platform_ops am35x_ops = { 486 #endif 487 .init = am35x_musb_init, 488 .exit = am35x_musb_exit, 489 490 .enable = am35x_musb_enable, 491 .disable = am35x_musb_disable, 492 493 #ifndef __UBOOT__ 494 .set_mode = am35x_musb_set_mode, 495 .try_idle = am35x_musb_try_idle, 496 497 .set_vbus = am35x_musb_set_vbus, 498 #endif 499 }; 500 501 #ifndef __UBOOT__ 502 static u64 am35x_dmamask = DMA_BIT_MASK(32); 503 504 static int __devinit am35x_probe(struct platform_device *pdev) 505 { 506 struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data; 507 struct platform_device *musb; 508 struct am35x_glue *glue; 509 510 struct clk *phy_clk; 511 struct clk *clk; 512 513 int ret = -ENOMEM; 514 515 glue = kzalloc(sizeof(*glue), GFP_KERNEL); 516 if (!glue) { 517 dev_err(&pdev->dev, "failed to allocate glue context\n"); 518 goto err0; 519 } 520 521 musb = platform_device_alloc("musb-hdrc", -1); 522 if (!musb) { 523 dev_err(&pdev->dev, "failed to allocate musb device\n"); 524 goto err1; 525 } 526 527 phy_clk = clk_get(&pdev->dev, "fck"); 528 if (IS_ERR(phy_clk)) { 529 dev_err(&pdev->dev, "failed to get PHY clock\n"); 530 ret = PTR_ERR(phy_clk); 531 goto err2; 532 } 533 534 clk = clk_get(&pdev->dev, "ick"); 535 if (IS_ERR(clk)) { 536 dev_err(&pdev->dev, "failed to get clock\n"); 537 ret = PTR_ERR(clk); 538 goto err3; 539 } 540 541 ret = clk_enable(phy_clk); 542 if (ret) { 543 dev_err(&pdev->dev, "failed to enable PHY clock\n"); 544 goto err4; 545 } 546 547 ret = clk_enable(clk); 548 if (ret) { 549 dev_err(&pdev->dev, "failed to enable clock\n"); 550 goto err5; 551 } 552 553 musb->dev.parent = &pdev->dev; 554 musb->dev.dma_mask = &am35x_dmamask; 555 musb->dev.coherent_dma_mask = am35x_dmamask; 556 557 glue->dev = &pdev->dev; 558 glue->musb = musb; 559 glue->phy_clk = phy_clk; 560 glue->clk = clk; 561 562 pdata->platform_ops = &am35x_ops; 563 564 platform_set_drvdata(pdev, glue); 565 566 ret = platform_device_add_resources(musb, pdev->resource, 567 pdev->num_resources); 568 if (ret) { 569 dev_err(&pdev->dev, "failed to add resources\n"); 570 goto err6; 571 } 572 573 ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); 574 if (ret) { 575 dev_err(&pdev->dev, "failed to add platform_data\n"); 576 goto err6; 577 } 578 579 ret = platform_device_add(musb); 580 if (ret) { 581 dev_err(&pdev->dev, "failed to register musb device\n"); 582 goto err6; 583 } 584 585 return 0; 586 587 err6: 588 clk_disable(clk); 589 590 err5: 591 clk_disable(phy_clk); 592 593 err4: 594 clk_put(clk); 595 596 err3: 597 clk_put(phy_clk); 598 599 err2: 600 platform_device_put(musb); 601 602 err1: 603 kfree(glue); 604 605 err0: 606 return ret; 607 } 608 609 static int __devexit am35x_remove(struct platform_device *pdev) 610 { 611 struct am35x_glue *glue = platform_get_drvdata(pdev); 612 613 platform_device_del(glue->musb); 614 platform_device_put(glue->musb); 615 clk_disable(glue->clk); 616 clk_disable(glue->phy_clk); 617 clk_put(glue->clk); 618 clk_put(glue->phy_clk); 619 kfree(glue); 620 621 return 0; 622 } 623 624 #ifdef CONFIG_PM 625 static int am35x_suspend(struct device *dev) 626 { 627 struct am35x_glue *glue = dev_get_drvdata(dev); 628 struct musb_hdrc_platform_data *plat = dev->platform_data; 629 struct omap_musb_board_data *data = plat->board_data; 630 631 /* Shutdown the on-chip PHY and its PLL. */ 632 if (data->set_phy_power) 633 data->set_phy_power(0); 634 635 clk_disable(glue->phy_clk); 636 clk_disable(glue->clk); 637 638 return 0; 639 } 640 641 static int am35x_resume(struct device *dev) 642 { 643 struct am35x_glue *glue = dev_get_drvdata(dev); 644 struct musb_hdrc_platform_data *plat = dev->platform_data; 645 struct omap_musb_board_data *data = plat->board_data; 646 int ret; 647 648 /* Start the on-chip PHY and its PLL. */ 649 if (data->set_phy_power) 650 data->set_phy_power(1); 651 652 ret = clk_enable(glue->phy_clk); 653 if (ret) { 654 dev_err(dev, "failed to enable PHY clock\n"); 655 return ret; 656 } 657 658 ret = clk_enable(glue->clk); 659 if (ret) { 660 dev_err(dev, "failed to enable clock\n"); 661 return ret; 662 } 663 664 return 0; 665 } 666 667 static struct dev_pm_ops am35x_pm_ops = { 668 .suspend = am35x_suspend, 669 .resume = am35x_resume, 670 }; 671 672 #define DEV_PM_OPS &am35x_pm_ops 673 #else 674 #define DEV_PM_OPS NULL 675 #endif 676 677 static struct platform_driver am35x_driver = { 678 .probe = am35x_probe, 679 .remove = __devexit_p(am35x_remove), 680 .driver = { 681 .name = "musb-am35x", 682 .pm = DEV_PM_OPS, 683 }, 684 }; 685 686 MODULE_DESCRIPTION("AM35x MUSB Glue Layer"); 687 MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>"); 688 MODULE_LICENSE("GPL v2"); 689 690 static int __init am35x_init(void) 691 { 692 return platform_driver_register(&am35x_driver); 693 } 694 module_init(am35x_init); 695 696 static void __exit am35x_exit(void) 697 { 698 platform_driver_unregister(&am35x_driver); 699 } 700 module_exit(am35x_exit); 701 #endif 702