linux/drivers/usb/musb/omap2430.c
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   1/*
   2 * Copyright (C) 2005-2007 by Texas Instruments
   3 * Some code has been taken from tusb6010.c
   4 * Copyrights for that are attributable to:
   5 * Copyright (C) 2006 Nokia Corporation
   6 * Tony Lindgren <tony@atomide.com>
   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 */
  27#include <linux/module.h>
  28#include <linux/kernel.h>
  29#include <linux/sched.h>
  30#include <linux/init.h>
  31#include <linux/list.h>
  32#include <linux/io.h>
  33#include <linux/of.h>
  34#include <linux/platform_device.h>
  35#include <linux/dma-mapping.h>
  36#include <linux/pm_runtime.h>
  37#include <linux/err.h>
  38#include <linux/delay.h>
  39#include <linux/usb/musb.h>
  40#include <linux/phy/omap_control_phy.h>
  41#include <linux/of_platform.h>
  42
  43#include "musb_core.h"
  44#include "omap2430.h"
  45
  46struct omap2430_glue {
  47        struct device           *dev;
  48        struct platform_device  *musb;
  49        enum musb_vbus_id_status status;
  50        struct work_struct      omap_musb_mailbox_work;
  51        struct device           *control_otghs;
  52};
  53#define glue_to_musb(g)         platform_get_drvdata(g->musb)
  54
  55static struct omap2430_glue     *_glue;
  56
  57static void omap2430_musb_set_vbus(struct musb *musb, int is_on)
  58{
  59        struct usb_otg  *otg = musb->xceiv->otg;
  60        u8              devctl;
  61        unsigned long timeout = jiffies + msecs_to_jiffies(1000);
  62        /* HDRC controls CPEN, but beware current surges during device
  63         * connect.  They can trigger transient overcurrent conditions
  64         * that must be ignored.
  65         */
  66
  67        devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
  68
  69        if (is_on) {
  70                if (musb->xceiv->otg->state == OTG_STATE_A_IDLE) {
  71                        int loops = 100;
  72                        /* start the session */
  73                        devctl |= MUSB_DEVCTL_SESSION;
  74                        musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
  75                        /*
  76                         * Wait for the musb to set as A device to enable the
  77                         * VBUS
  78                         */
  79                        while (musb_readb(musb->mregs, MUSB_DEVCTL) &
  80                               MUSB_DEVCTL_BDEVICE) {
  81
  82                                mdelay(5);
  83                                cpu_relax();
  84
  85                                if (time_after(jiffies, timeout)
  86                                    || loops-- <= 0) {
  87                                        dev_err(musb->controller,
  88                                        "configured as A device timeout");
  89                                        break;
  90                                }
  91                        }
  92
  93                        otg_set_vbus(otg, 1);
  94                } else {
  95                        musb->is_active = 1;
  96                        otg->default_a = 1;
  97                        musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
  98                        devctl |= MUSB_DEVCTL_SESSION;
  99                        MUSB_HST_MODE(musb);
 100                }
 101        } else {
 102                musb->is_active = 0;
 103
 104                /* NOTE:  we're skipping A_WAIT_VFALL -> A_IDLE and
 105                 * jumping right to B_IDLE...
 106                 */
 107
 108                otg->default_a = 0;
 109                musb->xceiv->otg->state = OTG_STATE_B_IDLE;
 110                devctl &= ~MUSB_DEVCTL_SESSION;
 111
 112                MUSB_DEV_MODE(musb);
 113        }
 114        musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 115
 116        dev_dbg(musb->controller, "VBUS %s, devctl %02x "
 117                /* otg %3x conf %08x prcm %08x */ "\n",
 118                usb_otg_state_string(musb->xceiv->otg->state),
 119                musb_readb(musb->mregs, MUSB_DEVCTL));
 120}
 121
 122static inline void omap2430_low_level_exit(struct musb *musb)
 123{
 124        u32 l;
 125
 126        /* in any role */
 127        l = musb_readl(musb->mregs, OTG_FORCESTDBY);
 128        l |= ENABLEFORCE;       /* enable MSTANDBY */
 129        musb_writel(musb->mregs, OTG_FORCESTDBY, l);
 130}
 131
 132static inline void omap2430_low_level_init(struct musb *musb)
 133{
 134        u32 l;
 135
 136        l = musb_readl(musb->mregs, OTG_FORCESTDBY);
 137        l &= ~ENABLEFORCE;      /* disable MSTANDBY */
 138        musb_writel(musb->mregs, OTG_FORCESTDBY, l);
 139}
 140
 141static int omap2430_musb_mailbox(enum musb_vbus_id_status status)
 142{
 143        struct omap2430_glue    *glue = _glue;
 144
 145        if (!glue) {
 146                pr_err("%s: musb core is not yet initialized\n", __func__);
 147                return -EPROBE_DEFER;
 148        }
 149        glue->status = status;
 150
 151        if (!glue_to_musb(glue)) {
 152                pr_err("%s: musb core is not yet ready\n", __func__);
 153                return -EPROBE_DEFER;
 154        }
 155
 156        schedule_work(&glue->omap_musb_mailbox_work);
 157
 158        return 0;
 159}
 160
 161static void omap_musb_set_mailbox(struct omap2430_glue *glue)
 162{
 163        struct musb *musb = glue_to_musb(glue);
 164        struct musb_hdrc_platform_data *pdata =
 165                dev_get_platdata(musb->controller);
 166        struct omap_musb_board_data *data = pdata->board_data;
 167        struct usb_otg *otg = musb->xceiv->otg;
 168
 169        pm_runtime_get_sync(musb->controller);
 170        switch (glue->status) {
 171        case MUSB_ID_GROUND:
 172                dev_dbg(musb->controller, "ID GND\n");
 173
 174                otg->default_a = true;
 175                musb->xceiv->otg->state = OTG_STATE_A_IDLE;
 176                musb->xceiv->last_event = USB_EVENT_ID;
 177                if (musb->gadget_driver) {
 178                        omap_control_usb_set_mode(glue->control_otghs,
 179                                USB_MODE_HOST);
 180                        omap2430_musb_set_vbus(musb, 1);
 181                }
 182                break;
 183
 184        case MUSB_VBUS_VALID:
 185                dev_dbg(musb->controller, "VBUS Connect\n");
 186
 187                otg->default_a = false;
 188                musb->xceiv->otg->state = OTG_STATE_B_IDLE;
 189                musb->xceiv->last_event = USB_EVENT_VBUS;
 190                omap_control_usb_set_mode(glue->control_otghs, USB_MODE_DEVICE);
 191                break;
 192
 193        case MUSB_ID_FLOAT:
 194        case MUSB_VBUS_OFF:
 195                dev_dbg(musb->controller, "VBUS Disconnect\n");
 196
 197                musb->xceiv->last_event = USB_EVENT_NONE;
 198                if (musb->gadget_driver)
 199                        omap2430_musb_set_vbus(musb, 0);
 200
 201                if (data->interface_type == MUSB_INTERFACE_UTMI)
 202                        otg_set_vbus(musb->xceiv->otg, 0);
 203
 204                omap_control_usb_set_mode(glue->control_otghs,
 205                        USB_MODE_DISCONNECT);
 206                break;
 207        default:
 208                dev_dbg(musb->controller, "ID float\n");
 209        }
 210        pm_runtime_mark_last_busy(musb->controller);
 211        pm_runtime_put_autosuspend(musb->controller);
 212        atomic_notifier_call_chain(&musb->xceiv->notifier,
 213                        musb->xceiv->last_event, NULL);
 214}
 215
 216
 217static void omap_musb_mailbox_work(struct work_struct *mailbox_work)
 218{
 219        struct omap2430_glue *glue = container_of(mailbox_work,
 220                                struct omap2430_glue, omap_musb_mailbox_work);
 221
 222        omap_musb_set_mailbox(glue);
 223}
 224
 225static irqreturn_t omap2430_musb_interrupt(int irq, void *__hci)
 226{
 227        unsigned long   flags;
 228        irqreturn_t     retval = IRQ_NONE;
 229        struct musb     *musb = __hci;
 230
 231        spin_lock_irqsave(&musb->lock, flags);
 232
 233        musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
 234        musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
 235        musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
 236
 237        if (musb->int_usb || musb->int_tx || musb->int_rx)
 238                retval = musb_interrupt(musb);
 239
 240        spin_unlock_irqrestore(&musb->lock, flags);
 241
 242        return retval;
 243}
 244
 245static int omap2430_musb_init(struct musb *musb)
 246{
 247        u32 l;
 248        int status = 0;
 249        struct device *dev = musb->controller;
 250        struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
 251        struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
 252        struct omap_musb_board_data *data = plat->board_data;
 253
 254        /* We require some kind of external transceiver, hooked
 255         * up through ULPI.  TWL4030-family PMICs include one,
 256         * which needs a driver, drivers aren't always needed.
 257         */
 258        if (dev->parent->of_node) {
 259                musb->phy = devm_phy_get(dev->parent, "usb2-phy");
 260
 261                /* We can't totally remove musb->xceiv as of now because
 262                 * musb core uses xceiv.state and xceiv.otg. Once we have
 263                 * a separate state machine to handle otg, these can be moved
 264                 * out of xceiv and then we can start using the generic PHY
 265                 * framework
 266                 */
 267                musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent,
 268                    "usb-phy", 0);
 269        } else {
 270                musb->xceiv = devm_usb_get_phy_dev(dev, 0);
 271                musb->phy = devm_phy_get(dev, "usb");
 272        }
 273
 274        if (IS_ERR(musb->xceiv)) {
 275                status = PTR_ERR(musb->xceiv);
 276
 277                if (status == -ENXIO)
 278                        return status;
 279
 280                pr_err("HS USB OTG: no transceiver configured\n");
 281                return -EPROBE_DEFER;
 282        }
 283
 284        if (IS_ERR(musb->phy)) {
 285                pr_err("HS USB OTG: no PHY configured\n");
 286                return PTR_ERR(musb->phy);
 287        }
 288        musb->isr = omap2430_musb_interrupt;
 289        phy_init(musb->phy);
 290        phy_power_on(musb->phy);
 291
 292        l = musb_readl(musb->mregs, OTG_INTERFSEL);
 293
 294        if (data->interface_type == MUSB_INTERFACE_UTMI) {
 295                /* OMAP4 uses Internal PHY GS70 which uses UTMI interface */
 296                l &= ~ULPI_12PIN;       /* Disable ULPI */
 297                l |= UTMI_8BIT;         /* Enable UTMI  */
 298        } else {
 299                l |= ULPI_12PIN;
 300        }
 301
 302        musb_writel(musb->mregs, OTG_INTERFSEL, l);
 303
 304        pr_debug("HS USB OTG: revision 0x%x, sysconfig 0x%02x, "
 305                        "sysstatus 0x%x, intrfsel 0x%x, simenable  0x%x\n",
 306                        musb_readl(musb->mregs, OTG_REVISION),
 307                        musb_readl(musb->mregs, OTG_SYSCONFIG),
 308                        musb_readl(musb->mregs, OTG_SYSSTATUS),
 309                        musb_readl(musb->mregs, OTG_INTERFSEL),
 310                        musb_readl(musb->mregs, OTG_SIMENABLE));
 311
 312        if (glue->status != MUSB_UNKNOWN)
 313                omap_musb_set_mailbox(glue);
 314
 315        return 0;
 316}
 317
 318static void omap2430_musb_enable(struct musb *musb)
 319{
 320        u8              devctl;
 321        unsigned long timeout = jiffies + msecs_to_jiffies(1000);
 322        struct device *dev = musb->controller;
 323        struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
 324        struct musb_hdrc_platform_data *pdata = dev_get_platdata(dev);
 325        struct omap_musb_board_data *data = pdata->board_data;
 326
 327
 328        switch (glue->status) {
 329
 330        case MUSB_ID_GROUND:
 331                omap_control_usb_set_mode(glue->control_otghs, USB_MODE_HOST);
 332                if (data->interface_type != MUSB_INTERFACE_UTMI)
 333                        break;
 334                devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
 335                /* start the session */
 336                devctl |= MUSB_DEVCTL_SESSION;
 337                musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 338                while (musb_readb(musb->mregs, MUSB_DEVCTL) &
 339                                MUSB_DEVCTL_BDEVICE) {
 340                        cpu_relax();
 341
 342                        if (time_after(jiffies, timeout)) {
 343                                dev_err(dev, "configured as A device timeout");
 344                                break;
 345                        }
 346                }
 347                break;
 348
 349        case MUSB_VBUS_VALID:
 350                omap_control_usb_set_mode(glue->control_otghs, USB_MODE_DEVICE);
 351                break;
 352
 353        default:
 354                break;
 355        }
 356}
 357
 358static void omap2430_musb_disable(struct musb *musb)
 359{
 360        struct device *dev = musb->controller;
 361        struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
 362
 363        if (glue->status != MUSB_UNKNOWN)
 364                omap_control_usb_set_mode(glue->control_otghs,
 365                        USB_MODE_DISCONNECT);
 366}
 367
 368static int omap2430_musb_exit(struct musb *musb)
 369{
 370        struct device *dev = musb->controller;
 371        struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
 372
 373        omap2430_low_level_exit(musb);
 374        phy_power_off(musb->phy);
 375        phy_exit(musb->phy);
 376        musb->phy = NULL;
 377        cancel_work_sync(&glue->omap_musb_mailbox_work);
 378
 379        return 0;
 380}
 381
 382static const struct musb_platform_ops omap2430_ops = {
 383        .quirks         = MUSB_DMA_INVENTRA,
 384#ifdef CONFIG_USB_INVENTRA_DMA
 385        .dma_init       = musbhs_dma_controller_create,
 386        .dma_exit       = musbhs_dma_controller_destroy,
 387#endif
 388        .init           = omap2430_musb_init,
 389        .exit           = omap2430_musb_exit,
 390
 391        .set_vbus       = omap2430_musb_set_vbus,
 392
 393        .enable         = omap2430_musb_enable,
 394        .disable        = omap2430_musb_disable,
 395
 396        .phy_callback   = omap2430_musb_mailbox,
 397};
 398
 399static u64 omap2430_dmamask = DMA_BIT_MASK(32);
 400
 401static int omap2430_probe(struct platform_device *pdev)
 402{
 403        struct resource                 musb_resources[3];
 404        struct musb_hdrc_platform_data  *pdata = dev_get_platdata(&pdev->dev);
 405        struct omap_musb_board_data     *data;
 406        struct platform_device          *musb;
 407        struct omap2430_glue            *glue;
 408        struct device_node              *np = pdev->dev.of_node;
 409        struct musb_hdrc_config         *config;
 410        int                             ret = -ENOMEM, val;
 411
 412        glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
 413        if (!glue)
 414                goto err0;
 415
 416        musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
 417        if (!musb) {
 418                dev_err(&pdev->dev, "failed to allocate musb device\n");
 419                goto err0;
 420        }
 421
 422        musb->dev.parent                = &pdev->dev;
 423        musb->dev.dma_mask              = &omap2430_dmamask;
 424        musb->dev.coherent_dma_mask     = omap2430_dmamask;
 425
 426        glue->dev                       = &pdev->dev;
 427        glue->musb                      = musb;
 428        glue->status                    = MUSB_UNKNOWN;
 429        glue->control_otghs = ERR_PTR(-ENODEV);
 430
 431        if (np) {
 432                struct device_node *control_node;
 433                struct platform_device *control_pdev;
 434
 435                pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 436                if (!pdata)
 437                        goto err2;
 438
 439                data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 440                if (!data)
 441                        goto err2;
 442
 443                config = devm_kzalloc(&pdev->dev, sizeof(*config), GFP_KERNEL);
 444                if (!config)
 445                        goto err2;
 446
 447                of_property_read_u32(np, "mode", (u32 *)&pdata->mode);
 448                of_property_read_u32(np, "interface-type",
 449                                                (u32 *)&data->interface_type);
 450                of_property_read_u32(np, "num-eps", (u32 *)&config->num_eps);
 451                of_property_read_u32(np, "ram-bits", (u32 *)&config->ram_bits);
 452                of_property_read_u32(np, "power", (u32 *)&pdata->power);
 453
 454                ret = of_property_read_u32(np, "multipoint", &val);
 455                if (!ret && val)
 456                        config->multipoint = true;
 457
 458                pdata->board_data       = data;
 459                pdata->config           = config;
 460
 461                control_node = of_parse_phandle(np, "ctrl-module", 0);
 462                if (control_node) {
 463                        control_pdev = of_find_device_by_node(control_node);
 464                        if (!control_pdev) {
 465                                dev_err(&pdev->dev, "Failed to get control device\n");
 466                                ret = -EINVAL;
 467                                goto err2;
 468                        }
 469                        glue->control_otghs = &control_pdev->dev;
 470                }
 471        }
 472        pdata->platform_ops             = &omap2430_ops;
 473
 474        platform_set_drvdata(pdev, glue);
 475
 476        /*
 477         * REVISIT if we ever have two instances of the wrapper, we will be
 478         * in big trouble
 479         */
 480        _glue   = glue;
 481
 482        INIT_WORK(&glue->omap_musb_mailbox_work, omap_musb_mailbox_work);
 483
 484        memset(musb_resources, 0x00, sizeof(*musb_resources) *
 485                        ARRAY_SIZE(musb_resources));
 486
 487        musb_resources[0].name = pdev->resource[0].name;
 488        musb_resources[0].start = pdev->resource[0].start;
 489        musb_resources[0].end = pdev->resource[0].end;
 490        musb_resources[0].flags = pdev->resource[0].flags;
 491
 492        musb_resources[1].name = pdev->resource[1].name;
 493        musb_resources[1].start = pdev->resource[1].start;
 494        musb_resources[1].end = pdev->resource[1].end;
 495        musb_resources[1].flags = pdev->resource[1].flags;
 496
 497        musb_resources[2].name = pdev->resource[2].name;
 498        musb_resources[2].start = pdev->resource[2].start;
 499        musb_resources[2].end = pdev->resource[2].end;
 500        musb_resources[2].flags = pdev->resource[2].flags;
 501
 502        ret = platform_device_add_resources(musb, musb_resources,
 503                        ARRAY_SIZE(musb_resources));
 504        if (ret) {
 505                dev_err(&pdev->dev, "failed to add resources\n");
 506                goto err2;
 507        }
 508
 509        ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 510        if (ret) {
 511                dev_err(&pdev->dev, "failed to add platform_data\n");
 512                goto err2;
 513        }
 514
 515        pm_runtime_enable(glue->dev);
 516
 517        ret = platform_device_add(musb);
 518        if (ret) {
 519                dev_err(&pdev->dev, "failed to register musb device\n");
 520                goto err3;
 521        }
 522
 523        return 0;
 524
 525err3:
 526        pm_runtime_disable(glue->dev);
 527
 528err2:
 529        platform_device_put(musb);
 530
 531err0:
 532        return ret;
 533}
 534
 535static int omap2430_remove(struct platform_device *pdev)
 536{
 537        struct omap2430_glue *glue = platform_get_drvdata(pdev);
 538
 539        platform_device_unregister(glue->musb);
 540        pm_runtime_disable(glue->dev);
 541
 542        return 0;
 543}
 544
 545#ifdef CONFIG_PM
 546
 547static int omap2430_runtime_suspend(struct device *dev)
 548{
 549        struct omap2430_glue            *glue = dev_get_drvdata(dev);
 550        struct musb                     *musb = glue_to_musb(glue);
 551
 552        if (!musb)
 553                return 0;
 554
 555        musb->context.otg_interfsel = musb_readl(musb->mregs,
 556                                                 OTG_INTERFSEL);
 557
 558        omap2430_low_level_exit(musb);
 559
 560        return 0;
 561}
 562
 563static int omap2430_runtime_resume(struct device *dev)
 564{
 565        struct omap2430_glue            *glue = dev_get_drvdata(dev);
 566        struct musb                     *musb = glue_to_musb(glue);
 567
 568        if (!musb)
 569                return 0;
 570
 571        omap2430_low_level_init(musb);
 572        musb_writel(musb->mregs, OTG_INTERFSEL,
 573                    musb->context.otg_interfsel);
 574
 575        return 0;
 576}
 577
 578static struct dev_pm_ops omap2430_pm_ops = {
 579        .runtime_suspend = omap2430_runtime_suspend,
 580        .runtime_resume = omap2430_runtime_resume,
 581};
 582
 583#define DEV_PM_OPS      (&omap2430_pm_ops)
 584#else
 585#define DEV_PM_OPS      NULL
 586#endif
 587
 588#ifdef CONFIG_OF
 589static const struct of_device_id omap2430_id_table[] = {
 590        {
 591                .compatible = "ti,omap4-musb"
 592        },
 593        {
 594                .compatible = "ti,omap3-musb"
 595        },
 596        {},
 597};
 598MODULE_DEVICE_TABLE(of, omap2430_id_table);
 599#endif
 600
 601static struct platform_driver omap2430_driver = {
 602        .probe          = omap2430_probe,
 603        .remove         = omap2430_remove,
 604        .driver         = {
 605                .name   = "musb-omap2430",
 606                .pm     = DEV_PM_OPS,
 607                .of_match_table = of_match_ptr(omap2430_id_table),
 608        },
 609};
 610
 611module_platform_driver(omap2430_driver);
 612
 613MODULE_DESCRIPTION("OMAP2PLUS MUSB Glue Layer");
 614MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
 615MODULE_LICENSE("GPL v2");
 616