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/io.h>
  33 #include <linux/err.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/dma-mapping.h>
  36 #include <linux/pm_runtime.h>
  37 #include <linux/module.h>
  38 #include <linux/usb/usb_phy_generic.h>
  39 #include <linux/platform_data/usb-omap.h>
  40 #include <linux/sizes.h>
  41
  42 #include <linux/of.h>
  43 #include <linux/of_device.h>
  44 #include <linux/of_address.h>
  45 #include <linux/of_irq.h>
  46 #include <linux/usb/of.h>
  47
  48 #include <linux/debugfs.h>
  49
  50 #include "musb_core.h"
  51
  52 static const struct of_device_id musb_dsps_of_match[];
  53
  54 /**
  55  * DSPS musb wrapper register offset.
  56  * FIXME: This should be expanded to have all the wrapper registers from TI DSPS
  57  * musb ips.
  58  */
  59 struct dsps_musb_wrapper {
  60         u16     revision;
  61         u16     control;
  62         u16     status;
  63         u16     epintr_set;
  64         u16     epintr_clear;
  65         u16     epintr_status;
  66         u16     coreintr_set;
  67         u16     coreintr_clear;
  68         u16     coreintr_status;
  69         u16     phy_utmi;
  70         u16     mode;
  71         u16     tx_mode;
  72         u16     rx_mode;
  73
  74         /* bit positions for control */
  75         unsigned        reset:5;
  76
  77         /* bit positions for interrupt */
  78         unsigned        usb_shift:5;
  79         u32             usb_mask;
  80         u32             usb_bitmap;
  81         unsigned        drvvbus:5;
  82
  83         unsigned        txep_shift:5;
  84         u32             txep_mask;
  85         u32             txep_bitmap;
  86
  87         unsigned        rxep_shift:5;
  88         u32             rxep_mask;
  89         u32             rxep_bitmap;
  90
  91         /* bit positions for phy_utmi */
  92         unsigned        otg_disable:5;
  93
  94         /* bit positions for mode */
  95         unsigned        iddig:5;
  96         unsigned        iddig_mux:5;
  97         /* miscellaneous stuff */
  98         unsigned        poll_timeout;
  99 };
 100
 101 /*
 102  * register shadow for suspend
 103  */
 104 struct dsps_context {
 105         u32 control;
 106         u32 epintr;
 107         u32 coreintr;
 108         u32 phy_utmi;
 109         u32 mode;
 110         u32 tx_mode;
 111         u32 rx_mode;
 112 };
 113
 114 /**
 115  * DSPS glue structure.
 116  */
 117 struct dsps_glue {
 118         struct device *dev;
 119         struct platform_device *musb;   /* child musb pdev */
 120         const struct dsps_musb_wrapper *wrp; /* wrapper register offsets */
 121         int vbus_irq;                   /* optional vbus irq */
 122         struct timer_list timer;        /* otg_workaround timer */
 123         unsigned long last_timer;    /* last timer data for each instance */
 124         bool sw_babble_enabled;
 125         void __iomem *usbss_base;
 126
 127         struct dsps_context context;
 128         struct debugfs_regset32 regset;
 129         struct dentry *dbgfs_root;
 130 };
 131
 132 static const struct debugfs_reg32 dsps_musb_regs[] = {
 133         { "revision",           0x00 },
 134         { "control",            0x14 },
 135         { "status",             0x18 },
 136         { "eoi",                0x24 },
 137         { "intr0_stat",         0x30 },
 138         { "intr1_stat",         0x34 },
 139         { "intr0_set",          0x38 },
 140         { "intr1_set",          0x3c },
 141         { "txmode",             0x70 },
 142         { "rxmode",             0x74 },
 143         { "autoreq",            0xd0 },
 144         { "srpfixtime",         0xd4 },
 145         { "tdown",              0xd8 },
 146         { "phy_utmi",           0xe0 },
 147         { "mode",               0xe8 },
 148 };
 149
 150 static void dsps_mod_timer(struct dsps_glue *glue, int wait_ms)
 151 {
 152         int wait;
 153
 154         if (wait_ms < 0)
 155                 wait = msecs_to_jiffies(glue->wrp->poll_timeout);
 156         else
 157                 wait = msecs_to_jiffies(wait_ms);
 158
 159         mod_timer(&glue->timer, jiffies + wait);
 160 }
 161
 162 /*
 163  * If no vbus irq from the PMIC is configured, we need to poll VBUS status.
 164  */
 165 static void dsps_mod_timer_optional(struct dsps_glue *glue)
 166 {
 167         if (glue->vbus_irq)
 168                 return;
 169
 170         dsps_mod_timer(glue, -1);
 171 }
 172
 173 /* USBSS  / USB AM335x */
 174 #define USBSS_IRQ_STATUS        0x28
 175 #define USBSS_IRQ_ENABLER       0x2c
 176 #define USBSS_IRQ_CLEARR        0x30
 177
 178 #define USBSS_IRQ_PD_COMP       (1 << 2)
 179
 180 /**
 181  * dsps_musb_enable - enable interrupts
 182  */
 183 static void dsps_musb_enable(struct musb *musb)
 184 {
 185         struct device *dev = musb->controller;
 186         struct platform_device *pdev = to_platform_device(dev->parent);
 187         struct dsps_glue *glue = platform_get_drvdata(pdev);
 188         const struct dsps_musb_wrapper *wrp = glue->wrp;
 189         void __iomem *reg_base = musb->ctrl_base;
 190         u32 epmask, coremask;
 191
 192         /* Workaround: setup IRQs through both register sets. */
 193         epmask = ((musb->epmask & wrp->txep_mask) << wrp->txep_shift) |
 194                ((musb->epmask & wrp->rxep_mask) << wrp->rxep_shift);
 195         coremask = (wrp->usb_bitmap & ~MUSB_INTR_SOF);
 196
 197         musb_writel(reg_base, wrp->epintr_set, epmask);
 198         musb_writel(reg_base, wrp->coreintr_set, coremask);
 199         /* start polling for ID change in dual-role idle mode */
 200         if (musb->xceiv->otg->state == OTG_STATE_B_IDLE &&
 201                         musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
 202                 dsps_mod_timer(glue, -1);
 203 }
 204
 205 /**
 206  * dsps_musb_disable - disable HDRC and flush interrupts
 207  */
 208 static void dsps_musb_disable(struct musb *musb)
 209 {
 210         struct device *dev = musb->controller;
 211         struct platform_device *pdev = to_platform_device(dev->parent);
 212         struct dsps_glue *glue = platform_get_drvdata(pdev);
 213         const struct dsps_musb_wrapper *wrp = glue->wrp;
 214         void __iomem *reg_base = musb->ctrl_base;
 215
 216         musb_writel(reg_base, wrp->coreintr_clear, wrp->usb_bitmap);
 217         musb_writel(reg_base, wrp->epintr_clear,
 218                          wrp->txep_bitmap | wrp->rxep_bitmap);
 219         del_timer_sync(&glue->timer);
 220 }
 221
 222 /* Caller must take musb->lock */
 223 static int dsps_check_status(struct musb *musb, void *unused)
 224 {
 225         void __iomem *mregs = musb->mregs;
 226         struct device *dev = musb->controller;
 227         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 228         const struct dsps_musb_wrapper *wrp = glue->wrp;
 229         u8 devctl;
 230         int skip_session = 0;
 231
 232         if (glue->vbus_irq)
 233                 del_timer(&glue->timer);
 234
 235         /*
 236          * We poll because DSPS IP's won't expose several OTG-critical
 237          * status change events (from the transceiver) otherwise.
 238          */
 239         devctl = musb_readb(mregs, MUSB_DEVCTL);
 240         dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl,
 241                                 usb_otg_state_string(musb->xceiv->otg->state));
 242
 243         switch (musb->xceiv->otg->state) {
 244         case OTG_STATE_A_WAIT_VRISE:
 245                 dsps_mod_timer_optional(glue);
 246                 break;
 247         case OTG_STATE_A_WAIT_BCON:
 248                 /* keep VBUS on for host-only mode */
 249                 if (musb->port_mode == MUSB_PORT_MODE_HOST) {
 250                         dsps_mod_timer_optional(glue);
 251                         break;
 252                 }
 253                 musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
 254                 skip_session = 1;
 255                 /* fall */
 256
 257         case OTG_STATE_A_IDLE:
 258         case OTG_STATE_B_IDLE:
 259                 if (!glue->vbus_irq) {
 260                         if (devctl & MUSB_DEVCTL_BDEVICE) {
 261                                 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
 262                                 MUSB_DEV_MODE(musb);
 263                         } else {
 264                                 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
 265                                 MUSB_HST_MODE(musb);
 266                         }
 267                         if (!(devctl & MUSB_DEVCTL_SESSION) && !skip_session)
 268                                 musb_writeb(mregs, MUSB_DEVCTL,
 269                                             MUSB_DEVCTL_SESSION);
 270                 }
 271                 dsps_mod_timer_optional(glue);
 272                 break;
 273         case OTG_STATE_A_WAIT_VFALL:
 274                 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
 275                 musb_writel(musb->ctrl_base, wrp->coreintr_set,
 276                             MUSB_INTR_VBUSERROR << wrp->usb_shift);
 277                 break;
 278         default:
 279                 break;
 280         }
 281
 282         return 0;
 283 }
 284
 285 static void otg_timer(unsigned long _musb)
 286 {
 287         struct musb *musb = (void *)_musb;
 288         struct device *dev = musb->controller;
 289         unsigned long flags;
 290         int err;
 291
 292         err = pm_runtime_get(dev);
 293         if ((err != -EINPROGRESS) && err < 0) {
 294                 dev_err(dev, "Poll could not pm_runtime_get: %i\n", err);
 295                 pm_runtime_put_noidle(dev);
 296
 297                 return;
 298         }
 299
 300         spin_lock_irqsave(&musb->lock, flags);
 301         err = musb_queue_resume_work(musb, dsps_check_status, NULL);
 302         if (err < 0)
 303                 dev_err(dev, "%s resume work: %i\n", __func__, err);
 304         spin_unlock_irqrestore(&musb->lock, flags);
 305         pm_runtime_mark_last_busy(dev);
 306         pm_runtime_put_autosuspend(dev);
 307 }
 308
 309 static void dsps_musb_clear_ep_rxintr(struct musb *musb, int epnum)
 310 {
 311         u32 epintr;
 312         struct dsps_glue *glue = dev_get_drvdata(musb->controller->parent);
 313         const struct dsps_musb_wrapper *wrp = glue->wrp;
 314
 315         /* musb->lock might already been held */
 316         epintr = (1 << epnum) << wrp->rxep_shift;
 317         musb_writel(musb->ctrl_base, wrp->epintr_status, epintr);
 318 }
 319
 320 static irqreturn_t dsps_interrupt(int irq, void *hci)
 321 {
 322         struct musb  *musb = hci;
 323         void __iomem *reg_base = musb->ctrl_base;
 324         struct device *dev = musb->controller;
 325         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 326         const struct dsps_musb_wrapper *wrp = glue->wrp;
 327         unsigned long flags;
 328         irqreturn_t ret = IRQ_NONE;
 329         u32 epintr, usbintr;
 330
 331         spin_lock_irqsave(&musb->lock, flags);
 332
 333         /* Get endpoint interrupts */
 334         epintr = musb_readl(reg_base, wrp->epintr_status);
 335         musb->int_rx = (epintr & wrp->rxep_bitmap) >> wrp->rxep_shift;
 336         musb->int_tx = (epintr & wrp->txep_bitmap) >> wrp->txep_shift;
 337
 338         if (epintr)
 339                 musb_writel(reg_base, wrp->epintr_status, epintr);
 340
 341         /* Get usb core interrupts */
 342         usbintr = musb_readl(reg_base, wrp->coreintr_status);
 343         if (!usbintr && !epintr)
 344                 goto out;
 345
 346         musb->int_usb = (usbintr & wrp->usb_bitmap) >> wrp->usb_shift;
 347         if (usbintr)
 348                 musb_writel(reg_base, wrp->coreintr_status, usbintr);
 349
 350         dev_dbg(musb->controller, "usbintr (%x) epintr(%x)\n",
 351                         usbintr, epintr);
 352
 353         if (usbintr & ((1 << wrp->drvvbus) << wrp->usb_shift)) {
 354                 int drvvbus = musb_readl(reg_base, wrp->status);
 355                 void __iomem *mregs = musb->mregs;
 356                 u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
 357                 int err;
 358
 359                 err = musb->int_usb & MUSB_INTR_VBUSERROR;
 360                 if (err) {
 361                         /*
 362                          * The Mentor core doesn't debounce VBUS as needed
 363                          * to cope with device connect current spikes. This
 364                          * means it's not uncommon for bus-powered devices
 365                          * to get VBUS errors during enumeration.
 366                          *
 367                          * This is a workaround, but newer RTL from Mentor
 368                          * seems to allow a better one: "re"-starting sessions
 369                          * without waiting for VBUS to stop registering in
 370                          * devctl.
 371                          */
 372                         musb->int_usb &= ~MUSB_INTR_VBUSERROR;
 373                         musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
 374                         dsps_mod_timer_optional(glue);
 375                         WARNING("VBUS error workaround (delay coming)\n");
 376                 } else if (drvvbus) {
 377                         MUSB_HST_MODE(musb);
 378                         musb->xceiv->otg->default_a = 1;
 379                         musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
 380                         dsps_mod_timer_optional(glue);
 381                 } else {
 382                         musb->is_active = 0;
 383                         MUSB_DEV_MODE(musb);
 384                         musb->xceiv->otg->default_a = 0;
 385                         musb->xceiv->otg->state = OTG_STATE_B_IDLE;
 386                 }
 387
 388                 /* NOTE: this must complete power-on within 100 ms. */
 389                 dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n",
 390                                 drvvbus ? "on" : "off",
 391                                 usb_otg_state_string(musb->xceiv->otg->state),
 392                                 err ? " ERROR" : "",
 393                                 devctl);
 394                 ret = IRQ_HANDLED;
 395         }
 396
 397         if (musb->int_tx || musb->int_rx || musb->int_usb)
 398                 ret |= musb_interrupt(musb);
 399
 400         /* Poll for ID change and connect */
 401         switch (musb->xceiv->otg->state) {
 402         case OTG_STATE_B_IDLE:
 403         case OTG_STATE_A_WAIT_BCON:
 404                 dsps_mod_timer_optional(glue);
 405                 break;
 406         default:
 407                 break;
 408         }
 409
 410 out:
 411         spin_unlock_irqrestore(&musb->lock, flags);
 412
 413         return ret;
 414 }
 415
 416 static int dsps_musb_dbg_init(struct musb *musb, struct dsps_glue *glue)
 417 {
 418         struct dentry *root;
 419         struct dentry *file;
 420         char buf[128];
 421
 422         sprintf(buf, "%s.dsps", dev_name(musb->controller));
 423         root = debugfs_create_dir(buf, NULL);
 424         if (!root)
 425                 return -ENOMEM;
 426         glue->dbgfs_root = root;
 427
 428         glue->regset.regs = dsps_musb_regs;
 429         glue->regset.nregs = ARRAY_SIZE(dsps_musb_regs);
 430         glue->regset.base = musb->ctrl_base;
 431
 432         file = debugfs_create_regset32("regdump", S_IRUGO, root, &glue->regset);
 433         if (!file) {
 434                 debugfs_remove_recursive(root);
 435                 return -ENOMEM;
 436         }
 437         return 0;
 438 }
 439
 440 static int dsps_musb_init(struct musb *musb)
 441 {
 442         struct device *dev = musb->controller;
 443         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 444         struct platform_device *parent = to_platform_device(dev->parent);
 445         const struct dsps_musb_wrapper *wrp = glue->wrp;
 446         void __iomem *reg_base;
 447         struct resource *r;
 448         u32 rev, val;
 449         int ret;
 450
 451         r = platform_get_resource_byname(parent, IORESOURCE_MEM, "control");
 452         reg_base = devm_ioremap_resource(dev, r);
 453         if (IS_ERR(reg_base))
 454                 return PTR_ERR(reg_base);
 455         musb->ctrl_base = reg_base;
 456
 457         /* NOP driver needs change if supporting dual instance */
 458         musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent, "phys", 0);
 459         if (IS_ERR(musb->xceiv))
 460                 return PTR_ERR(musb->xceiv);
 461
 462         musb->phy = devm_phy_get(dev->parent, "usb2-phy");
 463
 464         /* Returns zero if e.g. not clocked */
 465         rev = musb_readl(reg_base, wrp->revision);
 466         if (!rev)
 467                 return -ENODEV;
 468
 469         usb_phy_init(musb->xceiv);
 470         if (IS_ERR(musb->phy))  {
 471                 musb->phy = NULL;
 472         } else {
 473                 ret = phy_init(musb->phy);
 474                 if (ret < 0)
 475                         return ret;
 476                 ret = phy_power_on(musb->phy);
 477                 if (ret) {
 478                         phy_exit(musb->phy);
 479                         return ret;
 480                 }
 481         }
 482
 483         setup_timer(&glue->timer, otg_timer, (unsigned long) musb);
 484
 485         /* Reset the musb */
 486         musb_writel(reg_base, wrp->control, (1 << wrp->reset));
 487
 488         musb->isr = dsps_interrupt;
 489
 490         /* reset the otgdisable bit, needed for host mode to work */
 491         val = musb_readl(reg_base, wrp->phy_utmi);
 492         val &= ~(1 << wrp->otg_disable);
 493         musb_writel(musb->ctrl_base, wrp->phy_utmi, val);
 494
 495         /*
 496          *  Check whether the dsps version has babble control enabled.
 497          * In latest silicon revision the babble control logic is enabled.
 498          * If MUSB_BABBLE_CTL returns 0x4 then we have the babble control
 499          * logic enabled.
 500          */
 501         val = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
 502         if (val & MUSB_BABBLE_RCV_DISABLE) {
 503                 glue->sw_babble_enabled = true;
 504                 val |= MUSB_BABBLE_SW_SESSION_CTRL;
 505                 musb_writeb(musb->mregs, MUSB_BABBLE_CTL, val);
 506         }
 507
 508         dsps_mod_timer(glue, -1);
 509
 510         return dsps_musb_dbg_init(musb, glue);
 511 }
 512
 513 static int dsps_musb_exit(struct musb *musb)
 514 {
 515         struct device *dev = musb->controller;
 516         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 517
 518         del_timer_sync(&glue->timer);
 519         usb_phy_shutdown(musb->xceiv);
 520         phy_power_off(musb->phy);
 521         phy_exit(musb->phy);
 522         debugfs_remove_recursive(glue->dbgfs_root);
 523
 524         return 0;
 525 }
 526
 527 static int dsps_musb_set_mode(struct musb *musb, u8 mode)
 528 {
 529         struct device *dev = musb->controller;
 530         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 531         const struct dsps_musb_wrapper *wrp = glue->wrp;
 532         void __iomem *ctrl_base = musb->ctrl_base;
 533         u32 reg;
 534
 535         reg = musb_readl(ctrl_base, wrp->mode);
 536
 537         switch (mode) {
 538         case MUSB_HOST:
 539                 reg &= ~(1 << wrp->iddig);
 540
 541                 /*
 542                  * if we're setting mode to host-only or device-only, we're
 543                  * going to ignore whatever the PHY sends us and just force
 544                  * ID pin status by SW
 545                  */
 546                 reg |= (1 << wrp->iddig_mux);
 547
 548                 musb_writel(ctrl_base, wrp->mode, reg);
 549                 musb_writel(ctrl_base, wrp->phy_utmi, 0x02);
 550                 break;
 551         case MUSB_PERIPHERAL:
 552                 reg |= (1 << wrp->iddig);
 553
 554                 /*
 555                  * if we're setting mode to host-only or device-only, we're
 556                  * going to ignore whatever the PHY sends us and just force
 557                  * ID pin status by SW
 558                  */
 559                 reg |= (1 << wrp->iddig_mux);
 560
 561                 musb_writel(ctrl_base, wrp->mode, reg);
 562                 break;
 563         case MUSB_OTG:
 564                 musb_writel(ctrl_base, wrp->phy_utmi, 0x02);
 565                 break;
 566         default:
 567                 dev_err(glue->dev, "unsupported mode %d\n", mode);
 568                 return -EINVAL;
 569         }
 570
 571         return 0;
 572 }
 573
 574 static bool dsps_sw_babble_control(struct musb *musb)
 575 {
 576         u8 babble_ctl;
 577         bool session_restart =  false;
 578
 579         babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
 580         dev_dbg(musb->controller, "babble: MUSB_BABBLE_CTL value %x\n",
 581                 babble_ctl);
 582         /*
 583          * check line monitor flag to check whether babble is
 584          * due to noise
 585          */
 586         dev_dbg(musb->controller, "STUCK_J is %s\n",
 587                 babble_ctl & MUSB_BABBLE_STUCK_J ? "set" : "reset");
 588
 589         if (babble_ctl & MUSB_BABBLE_STUCK_J) {
 590                 int timeout = 10;
 591
 592                 /*
 593                  * babble is due to noise, then set transmit idle (d7 bit)
 594                  * to resume normal operation
 595                  */
 596                 babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
 597                 babble_ctl |= MUSB_BABBLE_FORCE_TXIDLE;
 598                 musb_writeb(musb->mregs, MUSB_BABBLE_CTL, babble_ctl);
 599
 600                 /* wait till line monitor flag cleared */
 601                 dev_dbg(musb->controller, "Set TXIDLE, wait J to clear\n");
 602                 do {
 603                         babble_ctl = musb_readb(musb->mregs, MUSB_BABBLE_CTL);
 604                         udelay(1);
 605                 } while ((babble_ctl & MUSB_BABBLE_STUCK_J) && timeout--);
 606
 607                 /* check whether stuck_at_j bit cleared */
 608                 if (babble_ctl & MUSB_BABBLE_STUCK_J) {
 609                         /*
 610                          * real babble condition has occurred
 611                          * restart the controller to start the
 612                          * session again
 613                          */
 614                         dev_dbg(musb->controller, "J not cleared, misc (%x)\n",
 615                                 babble_ctl);
 616                         session_restart = true;
 617                 }
 618         } else {
 619                 session_restart = true;
 620         }
 621
 622         return session_restart;
 623 }
 624
 625 static int dsps_musb_recover(struct musb *musb)
 626 {
 627         struct device *dev = musb->controller;
 628         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
 629         int session_restart = 0;
 630
 631         if (glue->sw_babble_enabled)
 632                 session_restart = dsps_sw_babble_control(musb);
 633         else
 634                 session_restart = 1;
 635
 636         return session_restart ? 0 : -EPIPE;
 637 }
 638
 639 /* Similar to am35x, dm81xx support only 32-bit read operation */
 640 static void dsps_read_fifo32(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
 641 {
 642         void __iomem *fifo = hw_ep->fifo;
 643
 644         if (len >= 4) {
 645                 ioread32_rep(fifo, dst, len >> 2);
 646                 dst += len & ~0x03;
 647                 len &= 0x03;
 648         }
 649
 650         /* Read any remaining 1 to 3 bytes */
 651         if (len > 0) {
 652                 u32 val = musb_readl(fifo, 0);
 653                 memcpy(dst, &val, len);
 654         }
 655 }
 656
 657 #ifdef CONFIG_USB_TI_CPPI41_DMA
 658 static void dsps_dma_controller_callback(struct dma_controller *c)
 659 {
 660         struct musb *musb = c->musb;
 661         struct dsps_glue *glue = dev_get_drvdata(musb->controller->parent);
 662         void __iomem *usbss_base = glue->usbss_base;
 663         u32 status;
 664
 665         status = musb_readl(usbss_base, USBSS_IRQ_STATUS);
 666         if (status & USBSS_IRQ_PD_COMP)
 667                 musb_writel(usbss_base, USBSS_IRQ_STATUS, USBSS_IRQ_PD_COMP);
 668 }
 669
 670 static struct dma_controller *
 671 dsps_dma_controller_create(struct musb *musb, void __iomem *base)
 672 {
 673         struct dma_controller *controller;
 674         struct dsps_glue *glue = dev_get_drvdata(musb->controller->parent);
 675         void __iomem *usbss_base = glue->usbss_base;
 676
 677         controller = cppi41_dma_controller_create(musb, base);
 678         if (IS_ERR_OR_NULL(controller))
 679                 return controller;
 680
 681         musb_writel(usbss_base, USBSS_IRQ_ENABLER, USBSS_IRQ_PD_COMP);
 682         controller->dma_callback = dsps_dma_controller_callback;
 683
 684         return controller;
 685 }
 686
 687 static void dsps_dma_controller_destroy(struct dma_controller *c)
 688 {
 689         struct musb *musb = c->musb;
 690         struct dsps_glue *glue = dev_get_drvdata(musb->controller->parent);
 691         void __iomem *usbss_base = glue->usbss_base;
 692
 693         musb_writel(usbss_base, USBSS_IRQ_CLEARR, USBSS_IRQ_PD_COMP);
 694         cppi41_dma_controller_destroy(c);
 695 }
 696
 697 #ifdef CONFIG_PM_SLEEP
 698 static void dsps_dma_controller_suspend(struct dsps_glue *glue)
 699 {
 700         void __iomem *usbss_base = glue->usbss_base;
 701
 702         musb_writel(usbss_base, USBSS_IRQ_CLEARR, USBSS_IRQ_PD_COMP);
 703 }
 704
 705 static void dsps_dma_controller_resume(struct dsps_glue *glue)
 706 {
 707         void __iomem *usbss_base = glue->usbss_base;
 708
 709         musb_writel(usbss_base, USBSS_IRQ_ENABLER, USBSS_IRQ_PD_COMP);
 710 }
 711 #endif
 712 #else /* CONFIG_USB_TI_CPPI41_DMA */
 713 #ifdef CONFIG_PM_SLEEP
 714 static void dsps_dma_controller_suspend(struct dsps_glue *glue) {}
 715 static void dsps_dma_controller_resume(struct dsps_glue *glue) {}
 716 #endif
 717 #endif /* CONFIG_USB_TI_CPPI41_DMA */
 718
 719 static struct musb_platform_ops dsps_ops = {
 720         .quirks         = MUSB_DMA_CPPI41 | MUSB_INDEXED_EP,
 721         .init           = dsps_musb_init,
 722         .exit           = dsps_musb_exit,
 723
 724 #ifdef CONFIG_USB_TI_CPPI41_DMA
 725         .dma_init       = dsps_dma_controller_create,
 726         .dma_exit       = dsps_dma_controller_destroy,
 727 #endif
 728         .enable         = dsps_musb_enable,
 729         .disable        = dsps_musb_disable,
 730
 731         .set_mode       = dsps_musb_set_mode,
 732         .recover        = dsps_musb_recover,
 733         .clear_ep_rxintr = dsps_musb_clear_ep_rxintr,
 734 };
 735
 736 static u64 musb_dmamask = DMA_BIT_MASK(32);
 737
 738 static int get_int_prop(struct device_node *dn, const char *s)
 739 {
 740         int ret;
 741         u32 val;
 742
 743         ret = of_property_read_u32(dn, s, &val);
 744         if (ret)
 745                 return 0;
 746         return val;
 747 }
 748
 749 static int get_musb_port_mode(struct device *dev)
 750 {
 751         enum usb_dr_mode mode;
 752
 753         mode = usb_get_dr_mode(dev);
 754         switch (mode) {
 755         case USB_DR_MODE_HOST:
 756                 return MUSB_PORT_MODE_HOST;
 757
 758         case USB_DR_MODE_PERIPHERAL:
 759                 return MUSB_PORT_MODE_GADGET;
 760
 761         case USB_DR_MODE_UNKNOWN:
 762         case USB_DR_MODE_OTG:
 763         default:
 764                 return MUSB_PORT_MODE_DUAL_ROLE;
 765         }
 766 }
 767
 768 static int dsps_create_musb_pdev(struct dsps_glue *glue,
 769                 struct platform_device *parent)
 770 {
 771         struct musb_hdrc_platform_data pdata;
 772         struct resource resources[2];
 773         struct resource *res;
 774         struct device *dev = &parent->dev;
 775         struct musb_hdrc_config *config;
 776         struct platform_device *musb;
 777         struct device_node *dn = parent->dev.of_node;
 778         int ret, val;
 779
 780         memset(resources, 0, sizeof(resources));
 781         res = platform_get_resource_byname(parent, IORESOURCE_MEM, "mc");
 782         if (!res) {
 783                 dev_err(dev, "failed to get memory.\n");
 784                 return -EINVAL;
 785         }
 786         resources[0] = *res;
 787
 788         res = platform_get_resource_byname(parent, IORESOURCE_IRQ, "mc");
 789         if (!res) {
 790                 dev_err(dev, "failed to get irq.\n");
 791                 return -EINVAL;
 792         }
 793         resources[1] = *res;
 794
 795         /* allocate the child platform device */
 796         musb = platform_device_alloc("musb-hdrc",
 797                         (resources[0].start & 0xFFF) == 0x400 ? 0 : 1);
 798         if (!musb) {
 799                 dev_err(dev, "failed to allocate musb device\n");
 800                 return -ENOMEM;
 801         }
 802
 803         musb->dev.parent                = dev;
 804         musb->dev.dma_mask              = &musb_dmamask;
 805         musb->dev.coherent_dma_mask     = musb_dmamask;
 806
 807         glue->musb = musb;
 808
 809         ret = platform_device_add_resources(musb, resources,
 810                         ARRAY_SIZE(resources));
 811         if (ret) {
 812                 dev_err(dev, "failed to add resources\n");
 813                 goto err;
 814         }
 815
 816         config = devm_kzalloc(&parent->dev, sizeof(*config), GFP_KERNEL);
 817         if (!config) {
 818                 ret = -ENOMEM;
 819                 goto err;
 820         }
 821         pdata.config = config;
 822         pdata.platform_ops = &dsps_ops;
 823
 824         config->num_eps = get_int_prop(dn, "mentor,num-eps");
 825         config->ram_bits = get_int_prop(dn, "mentor,ram-bits");
 826         config->host_port_deassert_reset_at_resume = 1;
 827         pdata.mode = get_musb_port_mode(dev);
 828         /* DT keeps this entry in mA, musb expects it as per USB spec */
 829         pdata.power = get_int_prop(dn, "mentor,power") / 2;
 830
 831         ret = of_property_read_u32(dn, "mentor,multipoint", &val);
 832         if (!ret && val)
 833                 config->multipoint = true;
 834
 835         config->maximum_speed = usb_get_maximum_speed(&parent->dev);
 836         switch (config->maximum_speed) {
 837         case USB_SPEED_LOW:
 838         case USB_SPEED_FULL:
 839                 break;
 840         case USB_SPEED_SUPER:
 841                 dev_warn(dev, "ignore incorrect maximum_speed "
 842                                 "(super-speed) setting in dts");
 843                 /* fall through */
 844         default:
 845                 config->maximum_speed = USB_SPEED_HIGH;
 846         }
 847
 848         ret = platform_device_add_data(musb, &pdata, sizeof(pdata));
 849         if (ret) {
 850                 dev_err(dev, "failed to add platform_data\n");
 851                 goto err;
 852         }
 853
 854         ret = platform_device_add(musb);
 855         if (ret) {
 856                 dev_err(dev, "failed to register musb device\n");
 857                 goto err;
 858         }
 859         return 0;
 860
 861 err:
 862         platform_device_put(musb);
 863         return ret;
 864 }
 865
 866 static irqreturn_t dsps_vbus_threaded_irq(int irq, void *priv)
 867 {
 868         struct dsps_glue *glue = priv;
 869         struct musb *musb = platform_get_drvdata(glue->musb);
 870
 871         if (!musb)
 872                 return IRQ_NONE;
 873
 874         dev_dbg(glue->dev, "VBUS interrupt\n");
 875         dsps_mod_timer(glue, 0);
 876
 877         return IRQ_HANDLED;
 878 }
 879
 880 static int dsps_setup_optional_vbus_irq(struct platform_device *pdev,
 881                                         struct dsps_glue *glue)
 882 {
 883         int error;
 884
 885         glue->vbus_irq = platform_get_irq_byname(pdev, "vbus");
 886         if (glue->vbus_irq == -EPROBE_DEFER)
 887                 return -EPROBE_DEFER;
 888
 889         if (glue->vbus_irq <= 0) {
 890                 glue->vbus_irq = 0;
 891                 return 0;
 892         }
 893
 894         error = devm_request_threaded_irq(glue->dev, glue->vbus_irq,
 895                                           NULL, dsps_vbus_threaded_irq,
 896                                           IRQF_ONESHOT,
 897                                           "vbus", glue);
 898         if (error) {
 899                 glue->vbus_irq = 0;
 900                 return error;
 901         }
 902         dev_dbg(glue->dev, "VBUS irq %i configured\n", glue->vbus_irq);
 903
 904         return 0;
 905 }
 906
 907 static int dsps_probe(struct platform_device *pdev)
 908 {
 909         const struct of_device_id *match;
 910         const struct dsps_musb_wrapper *wrp;
 911         struct dsps_glue *glue;
 912         int ret;
 913
 914         if (!strcmp(pdev->name, "musb-hdrc"))
 915                 return -ENODEV;
 916
 917         match = of_match_node(musb_dsps_of_match, pdev->dev.of_node);
 918         if (!match) {
 919                 dev_err(&pdev->dev, "fail to get matching of_match struct\n");
 920                 return -EINVAL;
 921         }
 922         wrp = match->data;
 923
 924         if (of_device_is_compatible(pdev->dev.of_node, "ti,musb-dm816"))
 925                 dsps_ops.read_fifo = dsps_read_fifo32;
 926
 927         /* allocate glue */
 928         glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
 929         if (!glue)
 930                 return -ENOMEM;
 931
 932         glue->dev = &pdev->dev;
 933         glue->wrp = wrp;
 934         glue->usbss_base = of_iomap(pdev->dev.parent->of_node, 0);
 935         if (!glue->usbss_base)
 936                 return -ENXIO;
 937
 938         if (usb_get_dr_mode(&pdev->dev) == USB_DR_MODE_PERIPHERAL) {
 939                 ret = dsps_setup_optional_vbus_irq(pdev, glue);
 940                 if (ret)
 941                         goto err_iounmap;
 942         }
 943
 944         platform_set_drvdata(pdev, glue);
 945         pm_runtime_enable(&pdev->dev);
 946         ret = dsps_create_musb_pdev(glue, pdev);
 947         if (ret)
 948                 goto err;
 949
 950         return 0;
 951
 952 err:
 953         pm_runtime_disable(&pdev->dev);
 954 err_iounmap:
 955         iounmap(glue->usbss_base);
 956         return ret;
 957 }
 958
 959 static int dsps_remove(struct platform_device *pdev)
 960 {
 961         struct dsps_glue *glue = platform_get_drvdata(pdev);
 962
 963         platform_device_unregister(glue->musb);
 964
 965         pm_runtime_disable(&pdev->dev);
 966         iounmap(glue->usbss_base);
 967
 968         return 0;
 969 }
 970
 971 static const struct dsps_musb_wrapper am33xx_driver_data = {
 972         .revision               = 0x00,
 973         .control                = 0x14,
 974         .status                 = 0x18,
 975         .epintr_set             = 0x38,
 976         .epintr_clear           = 0x40,
 977         .epintr_status          = 0x30,
 978         .coreintr_set           = 0x3c,
 979         .coreintr_clear         = 0x44,
 980         .coreintr_status        = 0x34,
 981         .phy_utmi               = 0xe0,
 982         .mode                   = 0xe8,
 983         .tx_mode                = 0x70,
 984         .rx_mode                = 0x74,
 985         .reset                  = 0,
 986         .otg_disable            = 21,
 987         .iddig                  = 8,
 988         .iddig_mux              = 7,
 989         .usb_shift              = 0,
 990         .usb_mask               = 0x1ff,
 991         .usb_bitmap             = (0x1ff << 0),
 992         .drvvbus                = 8,
 993         .txep_shift             = 0,
 994         .txep_mask              = 0xffff,
 995         .txep_bitmap            = (0xffff << 0),
 996         .rxep_shift             = 16,
 997         .rxep_mask              = 0xfffe,
 998         .rxep_bitmap            = (0xfffe << 16),
 999         .poll_timeout           = 2000, /* ms */
1000 };
1001
1002 static const struct of_device_id musb_dsps_of_match[] = {
1003         { .compatible = "ti,musb-am33xx",
1004                 .data = &am33xx_driver_data, },
1005         { .compatible = "ti,musb-dm816",
1006                 .data = &am33xx_driver_data, },
1007         {  },
1008 };
1009 MODULE_DEVICE_TABLE(of, musb_dsps_of_match);
1010
1011 #ifdef CONFIG_PM_SLEEP
1012 static int dsps_suspend(struct device *dev)
1013 {
1014         struct dsps_glue *glue = dev_get_drvdata(dev);
1015         const struct dsps_musb_wrapper *wrp = glue->wrp;
1016         struct musb *musb = platform_get_drvdata(glue->musb);
1017         void __iomem *mbase;
1018
1019         del_timer_sync(&glue->timer);
1020
1021         if (!musb)
1022                 /* This can happen if the musb device is in -EPROBE_DEFER */
1023                 return 0;
1024
1025         mbase = musb->ctrl_base;
1026         glue->context.control = musb_readl(mbase, wrp->control);
1027         glue->context.epintr = musb_readl(mbase, wrp->epintr_set);
1028         glue->context.coreintr = musb_readl(mbase, wrp->coreintr_set);
1029         glue->context.phy_utmi = musb_readl(mbase, wrp->phy_utmi);
1030         glue->context.mode = musb_readl(mbase, wrp->mode);
1031         glue->context.tx_mode = musb_readl(mbase, wrp->tx_mode);
1032         glue->context.rx_mode = musb_readl(mbase, wrp->rx_mode);
1033
1034         dsps_dma_controller_suspend(glue);
1035
1036         return 0;
1037 }
1038
1039 static int dsps_resume(struct device *dev)
1040 {
1041         struct dsps_glue *glue = dev_get_drvdata(dev);
1042         const struct dsps_musb_wrapper *wrp = glue->wrp;
1043         struct musb *musb = platform_get_drvdata(glue->musb);
1044         void __iomem *mbase;
1045
1046         if (!musb)
1047                 return 0;
1048
1049         dsps_dma_controller_resume(glue);
1050
1051         mbase = musb->ctrl_base;
1052         musb_writel(mbase, wrp->control, glue->context.control);
1053         musb_writel(mbase, wrp->epintr_set, glue->context.epintr);
1054         musb_writel(mbase, wrp->coreintr_set, glue->context.coreintr);
1055         musb_writel(mbase, wrp->phy_utmi, glue->context.phy_utmi);
1056         musb_writel(mbase, wrp->mode, glue->context.mode);
1057         musb_writel(mbase, wrp->tx_mode, glue->context.tx_mode);
1058         musb_writel(mbase, wrp->rx_mode, glue->context.rx_mode);
1059         if (musb->xceiv->otg->state == OTG_STATE_B_IDLE &&
1060             musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE)
1061                 dsps_mod_timer(glue, -1);
1062
1063         return 0;
1064 }
1065 #endif
1066
1067 static SIMPLE_DEV_PM_OPS(dsps_pm_ops, dsps_suspend, dsps_resume);
1068
1069 static struct platform_driver dsps_usbss_driver = {
1070         .probe          = dsps_probe,
1071         .remove         = dsps_remove,
1072         .driver         = {
1073                 .name   = "musb-dsps",
1074                 .pm     = &dsps_pm_ops,
1075                 .of_match_table = musb_dsps_of_match,
1076         },
1077 };
1078
1079 MODULE_DESCRIPTION("TI DSPS MUSB Glue Layer");
1080 MODULE_AUTHOR("Ravi B <ravibabu@ti.com>");
1081 MODULE_AUTHOR("Ajay Kumar Gupta <ajay.gupta@ti.com>");
1082 MODULE_LICENSE("GPL v2");
1083
1084 module_platform_driver(dsps_usbss_driver);