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 #define USBPHY_CM_PWRDN         (1 << 0)
 138 #define USBPHY_OTG_PWRDN        (1 << 1)
 139 #define USBPHY_OTGVDET_EN       (1 << 19)
 140 #define USBPHY_OTGSESSEND_EN    (1 << 20)
 141
 142 /**
 143  * musb_dsps_phy_control - phy on/off
 144  * @glue: struct dsps_glue *
 145  * @id: musb instance
 146  * @on: flag for phy to be switched on or off
 147  *
 148  * This is to enable the PHY using usb_ctrl register in system control
 149  * module space.
 150  *
 151  * XXX: This function will be removed once we have a seperate driver for
 152  * control module
 153  */
 154 static void musb_dsps_phy_control(struct dsps_glue *glue, u8 id, u8 on)
 155 {
 156         u32 usbphycfg;
 157
 158         usbphycfg = readl(glue->usb_ctrl[id]);
 159
 160         if (on) {
 161                 usbphycfg &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
 162                 usbphycfg |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
 163         } else {
 164                 usbphycfg |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
 165         }
 166
 167         writel(usbphycfg, glue->usb_ctrl[id]);
 168 }
 169 /**
 170  * dsps_musb_enable - enable interrupts
 171  */
 172 static void dsps_musb_enable(struct musb *musb)
 173 {
 174         struct device *dev = musb->controller;
 175         struct platform_device *pdev = to_platform_device(dev->parent);
 176         struct dsps_glue *glue = platform_get_drvdata(pdev);
 177         const struct dsps_musb_wrapper *wrp = glue->wrp;
 178         void __iomem *reg_base = musb->ctrl_base;
 179         u32 epmask, coremask;
 180
 181         /* Workaround: setup IRQs through both register sets. */
 182         epmask = ((musb->epmask & wrp->txep_mask) << wrp->txep_shift) |
 183                ((musb->epmask & wrp->rxep_mask) << wrp->rxep_shift);
 184         coremask = (wrp->usb_bitmap & ~MUSB_INTR_SOF);
 185
 186         dsps_writel(reg_base, wrp->epintr_set, epmask);
 187         dsps_writel(reg_base, wrp->coreintr_set, coremask);
 188         /* Force the DRVVBUS IRQ so we can start polling for ID change. */
 189         dsps_writel(reg_base, wrp->coreintr_set,
 190                     (1 << wrp->drvvbus) << wrp->usb_shift);
 191 }
 192
 193 /**
 194  * dsps_musb_disable - disable HDRC and flush interrupts
 195  */
 196 static void dsps_musb_disable(struct musb *musb)
 197 {
 198         struct device *dev = musb->controller;
 199         struct platform_device *pdev = to_platform_device(dev->parent);
 200         struct dsps_glue *glue = platform_get_drvdata(pdev);
 201         const struct dsps_musb_wrapper *wrp = glue->wrp;
 202         void __iomem *reg_base = musb->ctrl_base;
 203
 204         dsps_writel(reg_base, wrp->coreintr_clear, wrp->usb_bitmap);
 205         dsps_writel(reg_base, wrp->epintr_clear,
 206                          wrp->txep_bitmap | wrp->rxep_bitmap);
 207         dsps_writeb(musb->mregs, MUSB_DEVCTL, 0);
 208         dsps_writel(reg_base, wrp->eoi, 0);
 209 }
 210
 211 static void otg_timer(unsigned long _musb)
 212 {
 213         struct musb *musb = (void *)_musb;
 214         void __iomem *mregs = musb->mregs;
 215         struct device *dev = musb->controller;
 216         struct platform_device *pdev = to_platform_device(dev);
 217         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 218         const struct dsps_musb_wrapper *wrp = glue->wrp;
 219         u8 devctl;
 220         unsigned long flags;
 221
 222         /*
 223          * We poll because DSPS IP's won't expose several OTG-critical
 224          * status change events (from the transceiver) otherwise.
 225          */
 226         devctl = dsps_readb(mregs, MUSB_DEVCTL);
 227         dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl,
 228                                 otg_state_string(musb->xceiv->state));
 229
 230         spin_lock_irqsave(&musb->lock, flags);
 231         switch (musb->xceiv->state) {
 232         case OTG_STATE_A_WAIT_BCON:
 233                 devctl &= ~MUSB_DEVCTL_SESSION;
 234                 dsps_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 235
 236                 devctl = dsps_readb(musb->mregs, MUSB_DEVCTL);
 237                 if (devctl & MUSB_DEVCTL_BDEVICE) {
 238                         musb->xceiv->state = OTG_STATE_B_IDLE;
 239                         MUSB_DEV_MODE(musb);
 240                 } else {
 241                         musb->xceiv->state = OTG_STATE_A_IDLE;
 242                         MUSB_HST_MODE(musb);
 243                 }
 244                 break;
 245         case OTG_STATE_A_WAIT_VFALL:
 246                 musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
 247                 dsps_writel(musb->ctrl_base, wrp->coreintr_set,
 248                             MUSB_INTR_VBUSERROR << wrp->usb_shift);
 249                 break;
 250         case OTG_STATE_B_IDLE:
 251                 devctl = dsps_readb(mregs, MUSB_DEVCTL);
 252                 if (devctl & MUSB_DEVCTL_BDEVICE)
 253                         mod_timer(&glue->timer[pdev->id],
 254                                         jiffies + wrp->poll_seconds * HZ);
 255                 else
 256                         musb->xceiv->state = OTG_STATE_A_IDLE;
 257                 break;
 258         default:
 259                 break;
 260         }
 261         spin_unlock_irqrestore(&musb->lock, flags);
 262 }
 263
 264 static void dsps_musb_try_idle(struct musb *musb, unsigned long timeout)
 265 {
 266         struct device *dev = musb->controller;
 267         struct platform_device *pdev = to_platform_device(dev);
 268         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 269
 270         if (timeout == 0)
 271                 timeout = jiffies + msecs_to_jiffies(3);
 272
 273         /* Never idle if active, or when VBUS timeout is not set as host */
 274         if (musb->is_active || (musb->a_wait_bcon == 0 &&
 275                                 musb->xceiv->state == OTG_STATE_A_WAIT_BCON)) {
 276                 dev_dbg(musb->controller, "%s active, deleting timer\n",
 277                                 otg_state_string(musb->xceiv->state));
 278                 del_timer(&glue->timer[pdev->id]);
 279                 glue->last_timer[pdev->id] = jiffies;
 280                 return;
 281         }
 282
 283         if (time_after(glue->last_timer[pdev->id], timeout) &&
 284                                 timer_pending(&glue->timer[pdev->id])) {
 285                 dev_dbg(musb->controller,
 286                         "Longer idle timer already pending, ignoring...\n");
 287                 return;
 288         }
 289         glue->last_timer[pdev->id] = timeout;
 290
 291         dev_dbg(musb->controller, "%s inactive, starting idle timer for %u ms\n",
 292                 otg_state_string(musb->xceiv->state),
 293                         jiffies_to_msecs(timeout - jiffies));
 294         mod_timer(&glue->timer[pdev->id], timeout);
 295 }
 296
 297 static irqreturn_t dsps_interrupt(int irq, void *hci)
 298 {
 299         struct musb  *musb = hci;
 300         void __iomem *reg_base = musb->ctrl_base;
 301         struct device *dev = musb->controller;
 302         struct platform_device *pdev = to_platform_device(dev);
 303         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 304         const struct dsps_musb_wrapper *wrp = glue->wrp;
 305         unsigned long flags;
 306         irqreturn_t ret = IRQ_NONE;
 307         u32 epintr, usbintr;
 308
 309         spin_lock_irqsave(&musb->lock, flags);
 310
 311         /* Get endpoint interrupts */
 312         epintr = dsps_readl(reg_base, wrp->epintr_status);
 313         musb->int_rx = (epintr & wrp->rxep_bitmap) >> wrp->rxep_shift;
 314         musb->int_tx = (epintr & wrp->txep_bitmap) >> wrp->txep_shift;
 315
 316         if (epintr)
 317                 dsps_writel(reg_base, wrp->epintr_status, epintr);
 318
 319         /* Get usb core interrupts */
 320         usbintr = dsps_readl(reg_base, wrp->coreintr_status);
 321         if (!usbintr && !epintr)
 322                 goto eoi;
 323
 324         musb->int_usb = (usbintr & wrp->usb_bitmap) >> wrp->usb_shift;
 325         if (usbintr)
 326                 dsps_writel(reg_base, wrp->coreintr_status, usbintr);
 327
 328         dev_dbg(musb->controller, "usbintr (%x) epintr(%x)\n",
 329                         usbintr, epintr);
 330         /*
 331          * DRVVBUS IRQs are the only proxy we have (a very poor one!) for
 332          * DSPS IP's missing ID change IRQ.  We need an ID change IRQ to
 333          * switch appropriately between halves of the OTG state machine.
 334          * Managing DEVCTL.SESSION per Mentor docs requires that we know its
 335          * value but DEVCTL.BDEVICE is invalid without DEVCTL.SESSION set.
 336          * Also, DRVVBUS pulses for SRP (but not at 5V) ...
 337          */
 338         if (usbintr & MUSB_INTR_BABBLE)
 339                 pr_info("CAUTION: musb: Babble Interrupt Occurred\n");
 340
 341         if (usbintr & ((1 << wrp->drvvbus) << wrp->usb_shift)) {
 342                 int drvvbus = dsps_readl(reg_base, wrp->status);
 343                 void __iomem *mregs = musb->mregs;
 344                 u8 devctl = dsps_readb(mregs, MUSB_DEVCTL);
 345                 int err;
 346
 347                 err = musb->int_usb & MUSB_INTR_VBUSERROR;
 348                 if (err) {
 349                         /*
 350                          * The Mentor core doesn't debounce VBUS as needed
 351                          * to cope with device connect current spikes. This
 352                          * means it's not uncommon for bus-powered devices
 353                          * to get VBUS errors during enumeration.
 354                          *
 355                          * This is a workaround, but newer RTL from Mentor
 356                          * seems to allow a better one: "re"-starting sessions
 357                          * without waiting for VBUS to stop registering in
 358                          * devctl.
 359                          */
 360                         musb->int_usb &= ~MUSB_INTR_VBUSERROR;
 361                         musb->xceiv->state = OTG_STATE_A_WAIT_VFALL;
 362                         mod_timer(&glue->timer[pdev->id],
 363                                         jiffies + wrp->poll_seconds * HZ);
 364                         WARNING("VBUS error workaround (delay coming)\n");
 365                 } else if (drvvbus) {
 366                         musb->is_active = 1;
 367                         MUSB_HST_MODE(musb);
 368                         musb->xceiv->otg->default_a = 1;
 369                         musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
 370                         del_timer(&glue->timer[pdev->id]);
 371                 } else {
 372                         musb->is_active = 0;
 373                         MUSB_DEV_MODE(musb);
 374                         musb->xceiv->otg->default_a = 0;
 375                         musb->xceiv->state = OTG_STATE_B_IDLE;
 376                 }
 377
 378                 /* NOTE: this must complete power-on within 100 ms. */
 379                 dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n",
 380                                 drvvbus ? "on" : "off",
 381                                 otg_state_string(musb->xceiv->state),
 382                                 err ? " ERROR" : "",
 383                                 devctl);
 384                 ret = IRQ_HANDLED;
 385         }
 386
 387         if (musb->int_tx || musb->int_rx || musb->int_usb)
 388                 ret |= musb_interrupt(musb);
 389
 390  eoi:
 391         /* EOI needs to be written for the IRQ to be re-asserted. */
 392         if (ret == IRQ_HANDLED || epintr || usbintr)
 393                 dsps_writel(reg_base, wrp->eoi, 1);
 394
 395         /* Poll for ID change */
 396         if (musb->xceiv->state == OTG_STATE_B_IDLE)
 397                 mod_timer(&glue->timer[pdev->id],
 398                          jiffies + wrp->poll_seconds * HZ);
 399
 400         spin_unlock_irqrestore(&musb->lock, flags);
 401
 402         return ret;
 403 }
 404
 405 static int dsps_musb_init(struct musb *musb)
 406 {
 407         struct device *dev = musb->controller;
 408         struct platform_device *pdev = to_platform_device(dev);
 409         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 410         const struct dsps_musb_wrapper *wrp = glue->wrp;
 411         void __iomem *reg_base = musb->ctrl_base;
 412         u32 rev, val;
 413         int status;
 414
 415         /* mentor core register starts at offset of 0x400 from musb base */
 416         musb->mregs += wrp->musb_core_offset;
 417
 418         /* NOP driver needs change if supporting dual instance */
 419         usb_nop_xceiv_register();
 420         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
 421         if (IS_ERR_OR_NULL(musb->xceiv))
 422                 return -ENODEV;
 423
 424         /* Returns zero if e.g. not clocked */
 425         rev = dsps_readl(reg_base, wrp->revision);
 426         if (!rev) {
 427                 status = -ENODEV;
 428                 goto err0;
 429         }
 430
 431         setup_timer(&glue->timer[pdev->id], otg_timer, (unsigned long) musb);
 432
 433         /* Reset the musb */
 434         dsps_writel(reg_base, wrp->control, (1 << wrp->reset));
 435
 436         /* Start the on-chip PHY and its PLL. */
 437         musb_dsps_phy_control(glue, pdev->id, 1);
 438
 439         musb->isr = dsps_interrupt;
 440
 441         /* reset the otgdisable bit, needed for host mode to work */
 442         val = dsps_readl(reg_base, wrp->phy_utmi);
 443         val &= ~(1 << wrp->otg_disable);
 444         dsps_writel(musb->ctrl_base, wrp->phy_utmi, val);
 445
 446         /* clear level interrupt */
 447         dsps_writel(reg_base, wrp->eoi, 0);
 448
 449         return 0;
 450 err0:
 451         usb_put_phy(musb->xceiv);
 452         usb_nop_xceiv_unregister();
 453         return status;
 454 }
 455
 456 static int dsps_musb_exit(struct musb *musb)
 457 {
 458         struct device *dev = musb->controller;
 459         struct platform_device *pdev = to_platform_device(dev);
 460         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 461
 462         del_timer_sync(&glue->timer[pdev->id]);
 463
 464         /* Shutdown the on-chip PHY and its PLL. */
 465         musb_dsps_phy_control(glue, pdev->id, 0);
 466
 467         /* NOP driver needs change if supporting dual instance */
 468         usb_put_phy(musb->xceiv);
 469         usb_nop_xceiv_unregister();
 470
 471         return 0;
 472 }
 473
 474 static struct musb_platform_ops dsps_ops = {
 475         .init           = dsps_musb_init,
 476         .exit           = dsps_musb_exit,
 477
 478         .enable         = dsps_musb_enable,
 479         .disable        = dsps_musb_disable,
 480
 481         .try_idle       = dsps_musb_try_idle,
 482 };
 483
 484 static u64 musb_dmamask = DMA_BIT_MASK(32);
 485
 486 static int dsps_create_musb_pdev(struct dsps_glue *glue, u8 id)
 487 {
 488         struct device *dev = glue->dev;
 489         struct platform_device *pdev = to_platform_device(dev);
 490         struct musb_hdrc_platform_data  *pdata = dev->platform_data;
 491         struct device_node *np = pdev->dev.of_node;
 492         struct musb_hdrc_config *config;
 493         struct platform_device  *musb;
 494         struct resource *res;
 495         struct resource resources[2];
 496         char res_name[11];
 497         int ret;
 498
 499         resources[0].start = dsps_control_module_phys[id];
 500         resources[0].end = resources[0].start + SZ_4 - 1;
 501         resources[0].flags = IORESOURCE_MEM;
 502
 503         glue->usb_ctrl[id] = devm_request_and_ioremap(&pdev->dev, resources);
 504         if (glue->usb_ctrl[id] == NULL) {
 505                 dev_err(dev, "Failed to obtain usb_ctrl%d memory\n", id);
 506                 ret = -ENODEV;
 507                 goto err0;
 508         }
 509
 510         /* first resource is for usbss, so start index from 1 */
 511         res = platform_get_resource(pdev, IORESOURCE_MEM, id + 1);
 512         if (!res) {
 513                 dev_err(dev, "failed to get memory for instance %d\n", id);
 514                 ret = -ENODEV;
 515                 goto err0;
 516         }
 517         res->parent = NULL;
 518         resources[0] = *res;
 519
 520         /* first resource is for usbss, so start index from 1 */
 521         res = platform_get_resource(pdev, IORESOURCE_IRQ, id + 1);
 522         if (!res) {
 523                 dev_err(dev, "failed to get irq for instance %d\n", id);
 524                 ret = -ENODEV;
 525                 goto err0;
 526         }
 527         res->parent = NULL;
 528         resources[1] = *res;
 529         resources[1].name = "mc";
 530
 531         /* allocate the child platform device */
 532         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
 533         if (!musb) {
 534                 dev_err(dev, "failed to allocate musb device\n");
 535                 ret = -ENOMEM;
 536                 goto err0;
 537         }
 538
 539         musb->dev.parent                = dev;
 540         musb->dev.dma_mask              = &musb_dmamask;
 541         musb->dev.coherent_dma_mask     = musb_dmamask;
 542
 543         glue->musb[id]                  = musb;
 544
 545         ret = platform_device_add_resources(musb, resources, 2);
 546         if (ret) {
 547                 dev_err(dev, "failed to add resources\n");
 548                 goto err2;
 549         }
 550
 551         if (np) {
 552                 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 553                 if (!pdata) {
 554                         dev_err(&pdev->dev,
 555                                 "failed to allocate musb platfrom data\n");
 556                         ret = -ENOMEM;
 557                         goto err2;
 558                 }
 559
 560                 config = devm_kzalloc(&pdev->dev, sizeof(*config), GFP_KERNEL);
 561                 if (!config) {
 562                         dev_err(&pdev->dev,
 563                                 "failed to allocate musb hdrc config\n");
 564                         goto err2;
 565                 }
 566
 567                 of_property_read_u32(np, "num-eps", (u32 *)&config->num_eps);
 568                 of_property_read_u32(np, "ram-bits", (u32 *)&config->ram_bits);
 569                 snprintf(res_name, sizeof(res_name), "port%d-mode", id);
 570                 of_property_read_u32(np, res_name, (u32 *)&pdata->mode);
 571                 of_property_read_u32(np, "power", (u32 *)&pdata->power);
 572                 config->multipoint = of_property_read_bool(np, "multipoint");
 573
 574                 pdata->config           = config;
 575         }
 576
 577         pdata->platform_ops             = &dsps_ops;
 578
 579         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 580         if (ret) {
 581                 dev_err(dev, "failed to add platform_data\n");
 582                 goto err2;
 583         }
 584
 585         ret = platform_device_add(musb);
 586         if (ret) {
 587                 dev_err(dev, "failed to register musb device\n");
 588                 goto err2;
 589         }
 590
 591         return 0;
 592
 593 err2:
 594         platform_device_put(musb);
 595 err0:
 596         return ret;
 597 }
 598
 599 static int dsps_probe(struct platform_device *pdev)
 600 {
 601         struct device_node *np = pdev->dev.of_node;
 602         const struct of_device_id *match;
 603         const struct dsps_musb_wrapper *wrp;
 604         struct dsps_glue *glue;
 605         struct resource *iomem;
 606         int ret, i;
 607
 608         match = of_match_node(musb_dsps_of_match, np);
 609         if (!match) {
 610                 dev_err(&pdev->dev, "fail to get matching of_match struct\n");
 611                 ret = -EINVAL;
 612                 goto err0;
 613         }
 614         wrp = match->data;
 615
 616         /* allocate glue */
 617         glue = kzalloc(sizeof(*glue), GFP_KERNEL);
 618         if (!glue) {
 619                 dev_err(&pdev->dev, "unable to allocate glue memory\n");
 620                 ret = -ENOMEM;
 621                 goto err0;
 622         }
 623
 624         /* get memory resource */
 625         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 626         if (!iomem) {
 627                 dev_err(&pdev->dev, "failed to get usbss mem resourse\n");
 628                 ret = -ENODEV;
 629                 goto err1;
 630         }
 631
 632         glue->dev = &pdev->dev;
 633
 634         glue->wrp = kmemdup(wrp, sizeof(*wrp), GFP_KERNEL);
 635         if (!glue->wrp) {
 636                 dev_err(&pdev->dev, "failed to duplicate wrapper struct memory\n");
 637                 ret = -ENOMEM;
 638                 goto err1;
 639         }
 640         platform_set_drvdata(pdev, glue);
 641
 642         /* enable the usbss clocks */
 643         pm_runtime_enable(&pdev->dev);
 644
 645         ret = pm_runtime_get_sync(&pdev->dev);
 646         if (ret < 0) {
 647                 dev_err(&pdev->dev, "pm_runtime_get_sync FAILED");
 648                 goto err2;
 649         }
 650
 651         /* create the child platform device for all instances of musb */
 652         for (i = 0; i < wrp->instances ; i++) {
 653                 ret = dsps_create_musb_pdev(glue, i);
 654                 if (ret != 0) {
 655                         dev_err(&pdev->dev, "failed to create child pdev\n");
 656                         /* release resources of previously created instances */
 657                         for (i--; i >= 0 ; i--)
 658                                 platform_device_unregister(glue->musb[i]);
 659                         goto err3;
 660                 }
 661         }
 662
 663         return 0;
 664
 665 err3:
 666         pm_runtime_put(&pdev->dev);
 667 err2:
 668         pm_runtime_disable(&pdev->dev);
 669         kfree(glue->wrp);
 670 err1:
 671         kfree(glue);
 672 err0:
 673         return ret;
 674 }
 675 static int dsps_remove(struct platform_device *pdev)
 676 {
 677         struct dsps_glue *glue = platform_get_drvdata(pdev);
 678         const struct dsps_musb_wrapper *wrp = glue->wrp;
 679         int i;
 680
 681         /* delete the child platform device */
 682         for (i = 0; i < wrp->instances ; i++)
 683                 platform_device_unregister(glue->musb[i]);
 684
 685         /* disable usbss clocks */
 686         pm_runtime_put(&pdev->dev);
 687         pm_runtime_disable(&pdev->dev);
 688         kfree(glue->wrp);
 689         kfree(glue);
 690         return 0;
 691 }
 692
 693 #ifdef CONFIG_PM_SLEEP
 694 static int dsps_suspend(struct device *dev)
 695 {
 696         struct platform_device *pdev = to_platform_device(dev->parent);
 697         struct dsps_glue *glue = platform_get_drvdata(pdev);
 698         const struct dsps_musb_wrapper *wrp = glue->wrp;
 699         int i;
 700
 701         for (i = 0; i < wrp->instances; i++)
 702                 musb_dsps_phy_control(glue, i, 0);
 703
 704         return 0;
 705 }
 706
 707 static int dsps_resume(struct device *dev)
 708 {
 709         struct platform_device *pdev = to_platform_device(dev->parent);
 710         struct dsps_glue *glue = platform_get_drvdata(pdev);
 711         const struct dsps_musb_wrapper *wrp = glue->wrp;
 712         int i;
 713
 714         for (i = 0; i < wrp->instances; i++)
 715                 musb_dsps_phy_control(glue, i, 1);
 716
 717         return 0;
 718 }
 719 #endif
 720
 721 static SIMPLE_DEV_PM_OPS(dsps_pm_ops, dsps_suspend, dsps_resume);
 722
 723 static const struct dsps_musb_wrapper ti81xx_driver_data = {
 724         .revision               = 0x00,
 725         .control                = 0x14,
 726         .status                 = 0x18,
 727         .eoi                    = 0x24,
 728         .epintr_set             = 0x38,
 729         .epintr_clear           = 0x40,
 730         .epintr_status          = 0x30,
 731         .coreintr_set           = 0x3c,
 732         .coreintr_clear         = 0x44,
 733         .coreintr_status        = 0x34,
 734         .phy_utmi               = 0xe0,
 735         .mode                   = 0xe8,
 736         .reset                  = 0,
 737         .otg_disable            = 21,
 738         .iddig                  = 8,
 739         .usb_shift              = 0,
 740         .usb_mask               = 0x1ff,
 741         .usb_bitmap             = (0x1ff << 0),
 742         .drvvbus                = 8,
 743         .txep_shift             = 0,
 744         .txep_mask              = 0xffff,
 745         .txep_bitmap            = (0xffff << 0),
 746         .rxep_shift             = 16,
 747         .rxep_mask              = 0xfffe,
 748         .rxep_bitmap            = (0xfffe << 16),
 749         .musb_core_offset       = 0x400,
 750         .poll_seconds           = 2,
 751         .instances              = 1,
 752 };
 753
 754 static const struct platform_device_id musb_dsps_id_table[] = {
 755         {
 756                 .name   = "musb-ti81xx",
 757                 .driver_data    = (kernel_ulong_t) &ti81xx_driver_data,
 758         },
 759         {  },   /* Terminating Entry */
 760 };
 761 MODULE_DEVICE_TABLE(platform, musb_dsps_id_table);
 762
 763 #ifdef CONFIG_OF
 764 static const struct of_device_id musb_dsps_of_match[] = {
 765         { .compatible = "ti,musb-am33xx",
 766                 .data = (void *) &ti81xx_driver_data, },
 767         {  },
 768 };
 769 MODULE_DEVICE_TABLE(of, musb_dsps_of_match);
 770 #endif
 771
 772 static struct platform_driver dsps_usbss_driver = {
 773         .probe          = dsps_probe,
 774         .remove         = dsps_remove,
 775         .driver         = {
 776                 .name   = "musb-dsps",
 777                 .pm     = &dsps_pm_ops,
 778                 .of_match_table = of_match_ptr(musb_dsps_of_match),
 779         },
 780         .id_table       = musb_dsps_id_table,
 781 };
 782
 783 MODULE_DESCRIPTION("TI DSPS MUSB Glue Layer");
 784 MODULE_AUTHOR("Ravi B <ravibabu@ti.com>");
 785 MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>");
 786 MODULE_LICENSE("GPL v2");
 787
 788 static int __init dsps_init(void)
 789 {
 790         return platform_driver_register(&dsps_usbss_driver);
 791 }
 792 subsys_initcall(dsps_init);
 793
 794 static void __exit dsps_exit(void)
 795 {
 796         platform_driver_unregister(&dsps_usbss_driver);
 797 }
 798 module_exit(dsps_exit);