drivers/usb/musb/musb_dsps.c

   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/init.h>
  33 #include <linux/io.h>
  34 #include <linux/of.h>
  35 #include <linux/err.h>
  36 #include <linux/platform_device.h>
  37 #include <linux/dma-mapping.h>
  38 #include <linux/pm_runtime.h>
  39 #include <linux/module.h>
  40 #include <linux/usb/nop-usb-xceiv.h>
  41 #include <linux/platform_data/usb-omap.h>
  42
  43 #include <linux/of.h>
  44 #include <linux/of_device.h>
  45 #include <linux/of_address.h>
  46
  47 #include "musb_core.h"
  48
  49 #ifdef CONFIG_OF
  50 static const struct of_device_id musb_dsps_of_match[];
  51 #endif
  52
  53 /**
  54  * avoid using musb_readx()/musb_writex() as glue layer should not be
  55  * dependent on musb core layer symbols.
  56  */
  57 static inline u8 dsps_readb(const void __iomem *addr, unsigned offset)
  58         { return __raw_readb(addr + offset); }
  59
  60 static inline u32 dsps_readl(const void __iomem *addr, unsigned offset)
  61         { return __raw_readl(addr + offset); }
  62
  63 static inline void dsps_writeb(void __iomem *addr, unsigned offset, u8 data)
  64         { __raw_writeb(data, addr + offset); }
  65
  66 static inline void dsps_writel(void __iomem *addr, unsigned offset, u32 data)
  67         { __raw_writel(data, addr + offset); }
  68
  69 /**
  70  * DSPS musb wrapper register offset.
  71  * FIXME: This should be expanded to have all the wrapper registers from TI DSPS
  72  * musb ips.
  73  */
  74 struct dsps_musb_wrapper {
  75         u16     revision;
  76         u16     control;
  77         u16     status;
  78         u16     eoi;
  79         u16     epintr_set;
  80         u16     epintr_clear;
  81         u16     epintr_status;
  82         u16     coreintr_set;
  83         u16     coreintr_clear;
  84         u16     coreintr_status;
  85         u16     phy_utmi;
  86         u16     mode;
  87
  88         /* bit positions for control */
  89         unsigned        reset:5;
  90
  91         /* bit positions for interrupt */
  92         unsigned        usb_shift:5;
  93         u32             usb_mask;
  94         u32             usb_bitmap;
  95         unsigned        drvvbus:5;
  96
  97         unsigned        txep_shift:5;
  98         u32             txep_mask;
  99         u32             txep_bitmap;
 100
 101         unsigned        rxep_shift:5;
 102         u32             rxep_mask;
 103         u32             rxep_bitmap;
 104
 105         /* bit positions for phy_utmi */
 106         unsigned        otg_disable:5;
 107
 108         /* bit positions for mode */
 109         unsigned        iddig:5;
 110         /* miscellaneous stuff */
 111         u32             musb_core_offset;
 112         u8              poll_seconds;
 113         /* number of musb instances */
 114         u8              instances;
 115 };
 116
 117 /**
 118  * DSPS glue structure.
 119  */
 120 struct dsps_glue {
 121         struct device *dev;
 122         struct platform_device *musb[2];        /* child musb pdev */
 123         const struct dsps_musb_wrapper *wrp; /* wrapper register offsets */
 124         struct timer_list timer[2];     /* otg_workaround timer */
 125         unsigned long last_timer[2];    /* last timer data for each instance */
 126         u32 __iomem *usb_ctrl[2];
 127 };
 128
 129 #define DSPS_AM33XX_CONTROL_MODULE_PHYS_0       0x44e10620
 130 #define DSPS_AM33XX_CONTROL_MODULE_PHYS_1       0x44e10628
 131
 132 static const resource_size_t dsps_control_module_phys[] = {
 133         DSPS_AM33XX_CONTROL_MODULE_PHYS_0,
 134         DSPS_AM33XX_CONTROL_MODULE_PHYS_1,
 135 };
 136
 137 /**
 138  * musb_dsps_phy_control - phy on/off
 139  * @glue: struct dsps_glue *
 140  * @id: musb instance
 141  * @on: flag for phy to be switched on or off
 142  *
 143  * This is to enable the PHY using usb_ctrl register in system control
 144  * module space.
 145  *
 146  * XXX: This function will be removed once we have a seperate driver for
 147  * control module
 148  */
 149 static void musb_dsps_phy_control(struct dsps_glue *glue, u8 id, u8 on)
 150 {
 151         u32 usbphycfg;
 152
 153         usbphycfg = readl(glue->usb_ctrl[id]);
 154
 155         if (on) {
 156                 usbphycfg &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
 157                 usbphycfg |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
 158         } else {
 159                 usbphycfg |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
 160         }
 161
 162         writel(usbphycfg, glue->usb_ctrl[id]);
 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 platform_device *pdev = to_platform_device(dev->parent);
 171         struct dsps_glue *glue = platform_get_drvdata(pdev);
 172         const struct dsps_musb_wrapper *wrp = glue->wrp;
 173         void __iomem *reg_base = musb->ctrl_base;
 174         u32 epmask, coremask;
 175
 176         /* Workaround: setup IRQs through both register sets. */
 177         epmask = ((musb->epmask & wrp->txep_mask) << wrp->txep_shift) |
 178                ((musb->epmask & wrp->rxep_mask) << wrp->rxep_shift);
 179         coremask = (wrp->usb_bitmap & ~MUSB_INTR_SOF);
 180
 181         dsps_writel(reg_base, wrp->epintr_set, epmask);
 182         dsps_writel(reg_base, wrp->coreintr_set, coremask);
 183         /* Force the DRVVBUS IRQ so we can start polling for ID change. */
 184         dsps_writel(reg_base, wrp->coreintr_set,
 185                     (1 << wrp->drvvbus) << wrp->usb_shift);
 186 }
 187
 188 /**
 189  * dsps_musb_disable - disable HDRC and flush interrupts
 190  */
 191 static void dsps_musb_disable(struct musb *musb)
 192 {
 193         struct device *dev = musb->controller;
 194         struct platform_device *pdev = to_platform_device(dev->parent);
 195         struct dsps_glue *glue = platform_get_drvdata(pdev);
 196         const struct dsps_musb_wrapper *wrp = glue->wrp;
 197         void __iomem *reg_base = musb->ctrl_base;
 198
 199         dsps_writel(reg_base, wrp->coreintr_clear, wrp->usb_bitmap);
 200         dsps_writel(reg_base, wrp->epintr_clear,
 201                          wrp->txep_bitmap | wrp->rxep_bitmap);
 202         dsps_writeb(musb->mregs, MUSB_DEVCTL, 0);
 203         dsps_writel(reg_base, wrp->eoi, 0);
 204 }
 205
 206 static void otg_timer(unsigned long _musb)
 207 {
 208         struct musb *musb = (void *)_musb;
 209         void __iomem *mregs = musb->mregs;
 210         struct device *dev = musb->controller;
 211         struct platform_device *pdev = to_platform_device(dev);
 212         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 213         const struct dsps_musb_wrapper *wrp = glue->wrp;
 214         u8 devctl;
 215         unsigned long flags;
 216
 217         /*
 218          * We poll because DSPS IP's won't expose several OTG-critical
 219          * status change events (from the transceiver) otherwise.
 220          */
 221         devctl = dsps_readb(mregs, MUSB_DEVCTL);
 222         dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl,
 223                                 otg_state_string(musb->xceiv->state));
 224
 225         spin_lock_irqsave(&musb->lock, flags);
 226         switch (musb->xceiv->state) {
 227         case OTG_STATE_A_WAIT_BCON:
 228                 devctl &= ~MUSB_DEVCTL_SESSION;
 229                 dsps_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 230
 231                 devctl = dsps_readb(musb->mregs, MUSB_DEVCTL);
 232                 if (devctl & MUSB_DEVCTL_BDEVICE) {
 233                         musb->xceiv->state = OTG_STATE_B_IDLE;
 234                         MUSB_DEV_MODE(musb);
 235                 } else {
 236                         musb->xceiv->state = OTG_STATE_A_IDLE;
 237                         MUSB_HST_MODE(musb);
 238                 }
 239                 break;
 240         case OTG_STATE_A_WAIT_VFALL:
 241                 musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
 242                 dsps_writel(musb->ctrl_base, wrp->coreintr_set,
 243                             MUSB_INTR_VBUSERROR << wrp->usb_shift);
 244                 break;
 245         case OTG_STATE_B_IDLE:
 246                 devctl = dsps_readb(mregs, MUSB_DEVCTL);
 247                 if (devctl & MUSB_DEVCTL_BDEVICE)
 248                         mod_timer(&glue->timer[pdev->id],
 249                                         jiffies + wrp->poll_seconds * HZ);
 250                 else
 251                         musb->xceiv->state = OTG_STATE_A_IDLE;
 252                 break;
 253         default:
 254                 break;
 255         }
 256         spin_unlock_irqrestore(&musb->lock, flags);
 257 }
 258
 259 static void dsps_musb_try_idle(struct musb *musb, unsigned long timeout)
 260 {
 261         struct device *dev = musb->controller;
 262         struct platform_device *pdev = to_platform_device(dev);
 263         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 264
 265         if (timeout == 0)
 266                 timeout = jiffies + msecs_to_jiffies(3);
 267
 268         /* Never idle if active, or when VBUS timeout is not set as host */
 269         if (musb->is_active || (musb->a_wait_bcon == 0 &&
 270                                 musb->xceiv->state == OTG_STATE_A_WAIT_BCON)) {
 271                 dev_dbg(musb->controller, "%s active, deleting timer\n",
 272                                 otg_state_string(musb->xceiv->state));
 273                 del_timer(&glue->timer[pdev->id]);
 274                 glue->last_timer[pdev->id] = jiffies;
 275                 return;
 276         }
 277
 278         if (time_after(glue->last_timer[pdev->id], timeout) &&
 279                                 timer_pending(&glue->timer[pdev->id])) {
 280                 dev_dbg(musb->controller,
 281                         "Longer idle timer already pending, ignoring...\n");
 282                 return;
 283         }
 284         glue->last_timer[pdev->id] = timeout;
 285
 286         dev_dbg(musb->controller, "%s inactive, starting idle timer for %u ms\n",
 287                 otg_state_string(musb->xceiv->state),
 288                         jiffies_to_msecs(timeout - jiffies));
 289         mod_timer(&glue->timer[pdev->id], timeout);
 290 }
 291
 292 static irqreturn_t dsps_interrupt(int irq, void *hci)
 293 {
 294         struct musb  *musb = hci;
 295         void __iomem *reg_base = musb->ctrl_base;
 296         struct device *dev = musb->controller;
 297         struct platform_device *pdev = to_platform_device(dev);
 298         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 299         const struct dsps_musb_wrapper *wrp = glue->wrp;
 300         unsigned long flags;
 301         irqreturn_t ret = IRQ_NONE;
 302         u32 epintr, usbintr;
 303
 304         spin_lock_irqsave(&musb->lock, flags);
 305
 306         /* Get endpoint interrupts */
 307         epintr = dsps_readl(reg_base, wrp->epintr_status);
 308         musb->int_rx = (epintr & wrp->rxep_bitmap) >> wrp->rxep_shift;
 309         musb->int_tx = (epintr & wrp->txep_bitmap) >> wrp->txep_shift;
 310
 311         if (epintr)
 312                 dsps_writel(reg_base, wrp->epintr_status, epintr);
 313
 314         /* Get usb core interrupts */
 315         usbintr = dsps_readl(reg_base, wrp->coreintr_status);
 316         if (!usbintr && !epintr)
 317                 goto eoi;
 318
 319         musb->int_usb = (usbintr & wrp->usb_bitmap) >> wrp->usb_shift;
 320         if (usbintr)
 321                 dsps_writel(reg_base, wrp->coreintr_status, usbintr);
 322
 323         dev_dbg(musb->controller, "usbintr (%x) epintr(%x)\n",
 324                         usbintr, epintr);
 325         /*
 326          * DRVVBUS IRQs are the only proxy we have (a very poor one!) for
 327          * DSPS IP's missing ID change IRQ.  We need an ID change IRQ to
 328          * switch appropriately between halves of the OTG state machine.
 329          * Managing DEVCTL.SESSION per Mentor docs requires that we know its
 330          * value but DEVCTL.BDEVICE is invalid without DEVCTL.SESSION set.
 331          * Also, DRVVBUS pulses for SRP (but not at 5V) ...
 332          */
 333         if (usbintr & MUSB_INTR_BABBLE)
 334                 pr_info("CAUTION: musb: Babble Interrupt Occurred\n");
 335
 336         if (usbintr & ((1 << wrp->drvvbus) << wrp->usb_shift)) {
 337                 int drvvbus = dsps_readl(reg_base, wrp->status);
 338                 void __iomem *mregs = musb->mregs;
 339                 u8 devctl = dsps_readb(mregs, MUSB_DEVCTL);
 340                 int err;
 341
 342                 err = musb->int_usb & MUSB_INTR_VBUSERROR;
 343                 if (err) {
 344                         /*
 345                          * The Mentor core doesn't debounce VBUS as needed
 346                          * to cope with device connect current spikes. This
 347                          * means it's not uncommon for bus-powered devices
 348                          * to get VBUS errors during enumeration.
 349                          *
 350                          * This is a workaround, but newer RTL from Mentor
 351                          * seems to allow a better one: "re"-starting sessions
 352                          * without waiting for VBUS to stop registering in
 353                          * devctl.
 354                          */
 355                         musb->int_usb &= ~MUSB_INTR_VBUSERROR;
 356                         musb->xceiv->state = OTG_STATE_A_WAIT_VFALL;
 357                         mod_timer(&glue->timer[pdev->id],
 358                                         jiffies + wrp->poll_seconds * HZ);
 359                         WARNING("VBUS error workaround (delay coming)\n");
 360                 } else if (drvvbus) {
 361                         musb->is_active = 1;
 362                         MUSB_HST_MODE(musb);
 363                         musb->xceiv->otg->default_a = 1;
 364                         musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
 365                         del_timer(&glue->timer[pdev->id]);
 366                 } else {
 367                         musb->is_active = 0;
 368                         MUSB_DEV_MODE(musb);
 369                         musb->xceiv->otg->default_a = 0;
 370                         musb->xceiv->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                                 otg_state_string(musb->xceiv->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  eoi:
 386         /* EOI needs to be written for the IRQ to be re-asserted. */
 387         if (ret == IRQ_HANDLED || epintr || usbintr)
 388                 dsps_writel(reg_base, wrp->eoi, 1);
 389
 390         /* Poll for ID change */
 391         if (musb->xceiv->state == OTG_STATE_B_IDLE)
 392                 mod_timer(&glue->timer[pdev->id],
 393                          jiffies + wrp->poll_seconds * HZ);
 394
 395         spin_unlock_irqrestore(&musb->lock, flags);
 396
 397         return ret;
 398 }
 399
 400 static int dsps_musb_init(struct musb *musb)
 401 {
 402         struct device *dev = musb->controller;
 403         struct platform_device *pdev = to_platform_device(dev);
 404         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 405         const struct dsps_musb_wrapper *wrp = glue->wrp;
 406         void __iomem *reg_base = musb->ctrl_base;
 407         u32 rev, val;
 408         int status;
 409
 410         /* mentor core register starts at offset of 0x400 from musb base */
 411         musb->mregs += wrp->musb_core_offset;
 412
 413         /* NOP driver needs change if supporting dual instance */
 414         usb_nop_xceiv_register();
 415         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
 416         if (IS_ERR_OR_NULL(musb->xceiv))
 417                 return -ENODEV;
 418
 419         /* Returns zero if e.g. not clocked */
 420         rev = dsps_readl(reg_base, wrp->revision);
 421         if (!rev) {
 422                 status = -ENODEV;
 423                 goto err0;
 424         }
 425
 426         setup_timer(&glue->timer[pdev->id], otg_timer, (unsigned long) musb);
 427
 428         /* Reset the musb */
 429         dsps_writel(reg_base, wrp->control, (1 << wrp->reset));
 430
 431         /* Start the on-chip PHY and its PLL. */
 432         musb_dsps_phy_control(glue, pdev->id, 1);
 433
 434         musb->isr = dsps_interrupt;
 435
 436         /* reset the otgdisable bit, needed for host mode to work */
 437         val = dsps_readl(reg_base, wrp->phy_utmi);
 438         val &= ~(1 << wrp->otg_disable);
 439         dsps_writel(musb->ctrl_base, wrp->phy_utmi, val);
 440
 441         /* clear level interrupt */
 442         dsps_writel(reg_base, wrp->eoi, 0);
 443
 444         return 0;
 445 err0:
 446         usb_put_phy(musb->xceiv);
 447         usb_nop_xceiv_unregister();
 448         return status;
 449 }
 450
 451 static int dsps_musb_exit(struct musb *musb)
 452 {
 453         struct device *dev = musb->controller;
 454         struct platform_device *pdev = to_platform_device(dev);
 455         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 456
 457         del_timer_sync(&glue->timer[pdev->id]);
 458
 459         /* Shutdown the on-chip PHY and its PLL. */
 460         musb_dsps_phy_control(glue, pdev->id, 0);
 461
 462         /* NOP driver needs change if supporting dual instance */
 463         usb_put_phy(musb->xceiv);
 464         usb_nop_xceiv_unregister();
 465
 466         return 0;
 467 }
 468
 469 static struct musb_platform_ops dsps_ops = {
 470         .init           = dsps_musb_init,
 471         .exit           = dsps_musb_exit,
 472
 473         .enable         = dsps_musb_enable,
 474         .disable        = dsps_musb_disable,
 475
 476         .try_idle       = dsps_musb_try_idle,
 477 };
 478
 479 static u64 musb_dmamask = DMA_BIT_MASK(32);
 480
 481 static int dsps_create_musb_pdev(struct dsps_glue *glue, u8 id)
 482 {
 483         struct device *dev = glue->dev;
 484         struct platform_device *pdev = to_platform_device(dev);
 485         struct musb_hdrc_platform_data  *pdata = dev->platform_data;
 486         struct device_node *np = pdev->dev.of_node;
 487         struct musb_hdrc_config *config;
 488         struct platform_device  *musb;
 489         struct resource *res;
 490         struct resource resources[2];
 491         char res_name[11];
 492         int ret;
 493
 494         resources[0].start = dsps_control_module_phys[id];
 495         resources[0].end = resources[0].start + SZ_4 - 1;
 496         resources[0].flags = IORESOURCE_MEM;
 497
 498         glue->usb_ctrl[id] = devm_request_and_ioremap(&pdev->dev, resources);
 499         if (glue->usb_ctrl[id] == NULL) {
 500                 dev_err(dev, "Failed to obtain usb_ctrl%d memory\n", id);
 501                 ret = -ENODEV;
 502                 goto err0;
 503         }
 504
 505         /* first resource is for usbss, so start index from 1 */
 506         res = platform_get_resource(pdev, IORESOURCE_MEM, id + 1);
 507         if (!res) {
 508                 dev_err(dev, "failed to get memory for instance %d\n", id);
 509                 ret = -ENODEV;
 510                 goto err0;
 511         }
 512         res->parent = NULL;
 513         resources[0] = *res;
 514
 515         /* first resource is for usbss, so start index from 1 */
 516         res = platform_get_resource(pdev, IORESOURCE_IRQ, id + 1);
 517         if (!res) {
 518                 dev_err(dev, "failed to get irq for instance %d\n", id);
 519                 ret = -ENODEV;
 520                 goto err0;
 521         }
 522         res->parent = NULL;
 523         resources[1] = *res;
 524         resources[1].name = "mc";
 525
 526         /* allocate the child platform device */
 527         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
 528         if (!musb) {
 529                 dev_err(dev, "failed to allocate musb device\n");
 530                 ret = -ENOMEM;
 531                 goto err0;
 532         }
 533
 534         musb->dev.parent                = dev;
 535         musb->dev.dma_mask              = &musb_dmamask;
 536         musb->dev.coherent_dma_mask     = musb_dmamask;
 537
 538         glue->musb[id]                  = musb;
 539
 540         ret = platform_device_add_resources(musb, resources, 2);
 541         if (ret) {
 542                 dev_err(dev, "failed to add resources\n");
 543                 goto err2;
 544         }
 545
 546         if (np) {
 547                 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 548                 if (!pdata) {
 549                         dev_err(&pdev->dev,
 550                                 "failed to allocate musb platfrom data\n");
 551                         ret = -ENOMEM;
 552                         goto err2;
 553                 }
 554
 555                 config = devm_kzalloc(&pdev->dev, sizeof(*config), GFP_KERNEL);
 556                 if (!config) {
 557                         dev_err(&pdev->dev,
 558                                 "failed to allocate musb hdrc config\n");
 559                         goto err2;
 560                 }
 561
 562                 of_property_read_u32(np, "num-eps", (u32 *)&config->num_eps);
 563                 of_property_read_u32(np, "ram-bits", (u32 *)&config->ram_bits);
 564                 snprintf(res_name, sizeof(res_name), "port%d-mode", id);
 565                 of_property_read_u32(np, res_name, (u32 *)&pdata->mode);
 566                 of_property_read_u32(np, "power", (u32 *)&pdata->power);
 567                 config->multipoint = of_property_read_bool(np, "multipoint");
 568
 569                 pdata->config           = config;
 570         }
 571
 572         pdata->platform_ops             = &dsps_ops;
 573
 574         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 575         if (ret) {
 576                 dev_err(dev, "failed to add platform_data\n");
 577                 goto err2;
 578         }
 579
 580         ret = platform_device_add(musb);
 581         if (ret) {
 582                 dev_err(dev, "failed to register musb device\n");
 583                 goto err2;
 584         }
 585
 586         return 0;
 587
 588 err2:
 589         platform_device_put(musb);
 590 err0:
 591         return ret;
 592 }
 593
 594 static int dsps_probe(struct platform_device *pdev)
 595 {
 596         struct device_node *np = pdev->dev.of_node;
 597         const struct of_device_id *match;
 598         const struct dsps_musb_wrapper *wrp;
 599         struct dsps_glue *glue;
 600         struct resource *iomem;
 601         int ret, i;
 602
 603         match = of_match_node(musb_dsps_of_match, np);
 604         if (!match) {
 605                 dev_err(&pdev->dev, "fail to get matching of_match struct\n");
 606                 ret = -EINVAL;
 607                 goto err0;
 608         }
 609         wrp = match->data;
 610
 611         /* allocate glue */
 612         glue = kzalloc(sizeof(*glue), GFP_KERNEL);
 613         if (!glue) {
 614                 dev_err(&pdev->dev, "unable to allocate glue memory\n");
 615                 ret = -ENOMEM;
 616                 goto err0;
 617         }
 618
 619         /* get memory resource */
 620         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 621         if (!iomem) {
 622                 dev_err(&pdev->dev, "failed to get usbss mem resourse\n");
 623                 ret = -ENODEV;
 624                 goto err1;
 625         }
 626
 627         glue->dev = &pdev->dev;
 628
 629         glue->wrp = kmemdup(wrp, sizeof(*wrp), GFP_KERNEL);
 630         if (!glue->wrp) {
 631                 dev_err(&pdev->dev, "failed to duplicate wrapper struct memory\n");
 632                 ret = -ENOMEM;
 633                 goto err1;
 634         }
 635         platform_set_drvdata(pdev, glue);
 636
 637         /* enable the usbss clocks */
 638         pm_runtime_enable(&pdev->dev);
 639
 640         ret = pm_runtime_get_sync(&pdev->dev);
 641         if (ret < 0) {
 642                 dev_err(&pdev->dev, "pm_runtime_get_sync FAILED");
 643                 goto err2;
 644         }
 645
 646         /* create the child platform device for all instances of musb */
 647         for (i = 0; i < wrp->instances ; i++) {
 648                 ret = dsps_create_musb_pdev(glue, i);
 649                 if (ret != 0) {
 650                         dev_err(&pdev->dev, "failed to create child pdev\n");
 651                         /* release resources of previously created instances */
 652                         for (i--; i >= 0 ; i--)
 653                                 platform_device_unregister(glue->musb[i]);
 654                         goto err3;
 655                 }
 656         }
 657
 658         return 0;
 659
 660 err3:
 661         pm_runtime_put(&pdev->dev);
 662 err2:
 663         pm_runtime_disable(&pdev->dev);
 664         kfree(glue->wrp);
 665 err1:
 666         kfree(glue);
 667 err0:
 668         return ret;
 669 }
 670 static int dsps_remove(struct platform_device *pdev)
 671 {
 672         struct dsps_glue *glue = platform_get_drvdata(pdev);
 673         const struct dsps_musb_wrapper *wrp = glue->wrp;
 674         int i;
 675
 676         /* delete the child platform device */
 677         for (i = 0; i < wrp->instances ; i++)
 678                 platform_device_unregister(glue->musb[i]);
 679
 680         /* disable usbss clocks */
 681         pm_runtime_put(&pdev->dev);
 682         pm_runtime_disable(&pdev->dev);
 683         kfree(glue->wrp);
 684         kfree(glue);
 685         return 0;
 686 }
 687
 688 #ifdef CONFIG_PM_SLEEP
 689 static int dsps_suspend(struct device *dev)
 690 {
 691         struct platform_device *pdev = to_platform_device(dev->parent);
 692         struct dsps_glue *glue = platform_get_drvdata(pdev);
 693         const struct dsps_musb_wrapper *wrp = glue->wrp;
 694         int i;
 695
 696         for (i = 0; i < wrp->instances; i++)
 697                 musb_dsps_phy_control(glue, i, 0);
 698
 699         return 0;
 700 }
 701
 702 static int dsps_resume(struct device *dev)
 703 {
 704         struct platform_device *pdev = to_platform_device(dev->parent);
 705         struct dsps_glue *glue = platform_get_drvdata(pdev);
 706         const struct dsps_musb_wrapper *wrp = glue->wrp;
 707         int i;
 708
 709         for (i = 0; i < wrp->instances; i++)
 710                 musb_dsps_phy_control(glue, i, 1);
 711
 712         return 0;
 713 }
 714 #endif
 715
 716 static SIMPLE_DEV_PM_OPS(dsps_pm_ops, dsps_suspend, dsps_resume);
 717
 718 static const struct dsps_musb_wrapper ti81xx_driver_data = {
 719         .revision               = 0x00,
 720         .control                = 0x14,
 721         .status                 = 0x18,
 722         .eoi                    = 0x24,
 723         .epintr_set             = 0x38,
 724         .epintr_clear           = 0x40,
 725         .epintr_status          = 0x30,
 726         .coreintr_set           = 0x3c,
 727         .coreintr_clear         = 0x44,
 728         .coreintr_status        = 0x34,
 729         .phy_utmi               = 0xe0,
 730         .mode                   = 0xe8,
 731         .reset                  = 0,
 732         .otg_disable            = 21,
 733         .iddig                  = 8,
 734         .usb_shift              = 0,
 735         .usb_mask               = 0x1ff,
 736         .usb_bitmap             = (0x1ff << 0),
 737         .drvvbus                = 8,
 738         .txep_shift             = 0,
 739         .txep_mask              = 0xffff,
 740         .txep_bitmap            = (0xffff << 0),
 741         .rxep_shift             = 16,
 742         .rxep_mask              = 0xfffe,
 743         .rxep_bitmap            = (0xfffe << 16),
 744         .musb_core_offset       = 0x400,
 745         .poll_seconds           = 2,
 746         .instances              = 1,
 747 };
 748
 749 static const struct platform_device_id musb_dsps_id_table[] = {
 750         {
 751                 .name   = "musb-ti81xx",
 752                 .driver_data    = (kernel_ulong_t) &ti81xx_driver_data,
 753         },
 754         {  },   /* Terminating Entry */
 755 };
 756 MODULE_DEVICE_TABLE(platform, musb_dsps_id_table);
 757
 758 #ifdef CONFIG_OF
 759 static const struct of_device_id musb_dsps_of_match[] = {
 760         { .compatible = "ti,musb-am33xx",
 761                 .data = (void *) &ti81xx_driver_data, },
 762         {  },
 763 };
 764 MODULE_DEVICE_TABLE(of, musb_dsps_of_match);
 765 #endif
 766
 767 static struct platform_driver dsps_usbss_driver = {
 768         .probe          = dsps_probe,
 769         .remove         = dsps_remove,
 770         .driver         = {
 771                 .name   = "musb-dsps",
 772                 .pm     = &dsps_pm_ops,
 773                 .of_match_table = of_match_ptr(musb_dsps_of_match),
 774         },
 775         .id_table       = musb_dsps_id_table,
 776 };
 777
 778 MODULE_DESCRIPTION("TI DSPS MUSB Glue Layer");
 779 MODULE_AUTHOR("Ravi B <ravibabu@ti.com>");
 780 MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>");
 781 MODULE_LICENSE("GPL v2");
 782
 783 static int __init dsps_init(void)
 784 {
 785         return platform_driver_register(&dsps_usbss_driver);
 786 }
 787 subsys_initcall(dsps_init);
 788
 789 static void __exit dsps_exit(void)
 790 {
 791         platform_driver_unregister(&dsps_usbss_driver);
 792 }
 793 module_exit(dsps_exit);