Merge branch 'stable-3.14' of git://git.infradead.org/users/pcmoore/selinux into...

[mirror_ubuntu-artful-kernel.git] / drivers / usb / musb / musb_core.c

/*
 * MUSB OTG driver core code
 *
 * Copyright 2005 Mentor Graphics Corporation
 * Copyright (C) 2005-2006 by Texas Instruments
 * Copyright (C) 2006-2007 Nokia Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

/*
 * Inventra (Multipoint) Dual-Role Controller Driver for Linux.
 *
 * This consists of a Host Controller Driver (HCD) and a peripheral
 * controller driver implementing the "Gadget" API; OTG support is
 * in the works.  These are normal Linux-USB controller drivers which
 * use IRQs and have no dedicated thread.
 *
 * This version of the driver has only been used with products from
 * Texas Instruments.  Those products integrate the Inventra logic
 * with other DMA, IRQ, and bus modules, as well as other logic that
 * needs to be reflected in this driver.
 *
 *
 * NOTE:  the original Mentor code here was pretty much a collection
 * of mechanisms that don't seem to have been fully integrated/working
 * for *any* Linux kernel version.  This version aims at Linux 2.6.now,
 * Key open issues include:
 *
 *  - Lack of host-side transaction scheduling, for all transfer types.
 *    The hardware doesn't do it; instead, software must.
 *
 *    This is not an issue for OTG devices that don't support external
 *    hubs, but for more "normal" USB hosts it's a user issue that the
 *    "multipoint" support doesn't scale in the expected ways.  That
 *    includes DaVinci EVM in a common non-OTG mode.
 *
 *      * Control and bulk use dedicated endpoints, and there's as
 *        yet no mechanism to either (a) reclaim the hardware when
 *        peripherals are NAKing, which gets complicated with bulk
 *        endpoints, or (b) use more than a single bulk endpoint in
 *        each direction.
 *
 *        RESULT:  one device may be perceived as blocking another one.
 *
 *      * Interrupt and isochronous will dynamically allocate endpoint
 *        hardware, but (a) there's no record keeping for bandwidth;
 *        (b) in the common case that few endpoints are available, there
 *        is no mechanism to reuse endpoints to talk to multiple devices.
 *
 *        RESULT:  At one extreme, bandwidth can be overcommitted in
 *        some hardware configurations, no faults will be reported.
 *        At the other extreme, the bandwidth capabilities which do
 *        exist tend to be severely undercommitted.  You can't yet hook
 *        up both a keyboard and a mouse to an external USB hub.
 */

/*
 * This gets many kinds of configuration information:
 *      - Kconfig for everything user-configurable
 *      - platform_device for addressing, irq, and platform_data
 *      - platform_data is mostly for board-specific information
 *        (plus recentrly, SOC or family details)
 *
 * Most of the conditional compilation will (someday) vanish.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/kobject.h>
#include <linux/prefetch.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>

#include "musb_core.h"

#define TA_WAIT_BCON(m) max_t(int, (m)->a_wait_bcon, OTG_TIME_A_WAIT_BCON)


#define DRIVER_AUTHOR "Mentor Graphics, Texas Instruments, Nokia"
#define DRIVER_DESC "Inventra Dual-Role USB Controller Driver"

#define MUSB_VERSION "6.0"

#define DRIVER_INFO DRIVER_DESC ", v" MUSB_VERSION

#define MUSB_DRIVER_NAME "musb-hdrc"
const char musb_driver_name[] = MUSB_DRIVER_NAME;

MODULE_DESCRIPTION(DRIVER_INFO);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" MUSB_DRIVER_NAME);


/*-------------------------------------------------------------------------*/

static inline struct musb *dev_to_musb(struct device *dev)
{
        return dev_get_drvdata(dev);
}

/*-------------------------------------------------------------------------*/

#ifndef CONFIG_BLACKFIN
static int musb_ulpi_read(struct usb_phy *phy, u32 offset)
{
        void __iomem *addr = phy->io_priv;
        int     i = 0;
        u8      r;
        u8      power;
        int     ret;

        pm_runtime_get_sync(phy->io_dev);

        /* Make sure the transceiver is not in low power mode */
        power = musb_readb(addr, MUSB_POWER);
        power &= ~MUSB_POWER_SUSPENDM;
        musb_writeb(addr, MUSB_POWER, power);

        /* REVISIT: musbhdrc_ulpi_an.pdf recommends setting the
         * ULPICarKitControlDisableUTMI after clearing POWER_SUSPENDM.
         */

        musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)offset);
        musb_writeb(addr, MUSB_ULPI_REG_CONTROL,
                        MUSB_ULPI_REG_REQ | MUSB_ULPI_RDN_WR);

        while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
                                & MUSB_ULPI_REG_CMPLT)) {
                i++;
                if (i == 10000) {
                        ret = -ETIMEDOUT;
                        goto out;
                }

        }
        r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
        r &= ~MUSB_ULPI_REG_CMPLT;
        musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);

        ret = musb_readb(addr, MUSB_ULPI_REG_DATA);

out:
        pm_runtime_put(phy->io_dev);

        return ret;
}

static int musb_ulpi_write(struct usb_phy *phy, u32 offset, u32 data)
{
        void __iomem *addr = phy->io_priv;
        int     i = 0;
        u8      r = 0;
        u8      power;
        int     ret = 0;

        pm_runtime_get_sync(phy->io_dev);

        /* Make sure the transceiver is not in low power mode */
        power = musb_readb(addr, MUSB_POWER);
        power &= ~MUSB_POWER_SUSPENDM;
        musb_writeb(addr, MUSB_POWER, power);

        musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)offset);
        musb_writeb(addr, MUSB_ULPI_REG_DATA, (u8)data);
        musb_writeb(addr, MUSB_ULPI_REG_CONTROL, MUSB_ULPI_REG_REQ);

        while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL)
                                & MUSB_ULPI_REG_CMPLT)) {
                i++;
                if (i == 10000) {
                        ret = -ETIMEDOUT;
                        goto out;
                }
        }

        r = musb_readb(addr, MUSB_ULPI_REG_CONTROL);
        r &= ~MUSB_ULPI_REG_CMPLT;
        musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r);

out:
        pm_runtime_put(phy->io_dev);

        return ret;
}
#else
#define musb_ulpi_read          NULL
#define musb_ulpi_write         NULL
#endif

static struct usb_phy_io_ops musb_ulpi_access = {
        .read = musb_ulpi_read,
        .write = musb_ulpi_write,
};

/*-------------------------------------------------------------------------*/

#if !defined(CONFIG_USB_MUSB_TUSB6010) && !defined(CONFIG_USB_MUSB_BLACKFIN)

/*
 * Load an endpoint's FIFO
 */
void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
{
        struct musb *musb = hw_ep->musb;
        void __iomem *fifo = hw_ep->fifo;

        if (unlikely(len == 0))
                return;

        prefetch((u8 *)src);

        dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
                        'T', hw_ep->epnum, fifo, len, src);

        /* we can't assume unaligned reads work */
        if (likely((0x01 & (unsigned long) src) == 0)) {
                u16     index = 0;

                /* best case is 32bit-aligned source address */
                if ((0x02 & (unsigned long) src) == 0) {
                        if (len >= 4) {
                                iowrite32_rep(fifo, src + index, len >> 2);
                                index += len & ~0x03;
                        }
                        if (len & 0x02) {
                                musb_writew(fifo, 0, *(u16 *)&src[index]);
                                index += 2;
                        }
                } else {
                        if (len >= 2) {
                                iowrite16_rep(fifo, src + index, len >> 1);
                                index += len & ~0x01;
                        }
                }
                if (len & 0x01)
                        musb_writeb(fifo, 0, src[index]);
        } else  {
                /* byte aligned */
                iowrite8_rep(fifo, src, len);
        }
}

#if !defined(CONFIG_USB_MUSB_AM35X)
/*
 * Unload an endpoint's FIFO
 */
void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
{
        struct musb *musb = hw_ep->musb;
        void __iomem *fifo = hw_ep->fifo;

        if (unlikely(len == 0))
                return;

        dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
                        'R', hw_ep->epnum, fifo, len, dst);

        /* we can't assume unaligned writes work */
        if (likely((0x01 & (unsigned long) dst) == 0)) {
                u16     index = 0;

                /* best case is 32bit-aligned destination address */
                if ((0x02 & (unsigned long) dst) == 0) {
                        if (len >= 4) {
                                ioread32_rep(fifo, dst, len >> 2);
                                index = len & ~0x03;
                        }
                        if (len & 0x02) {
                                *(u16 *)&dst[index] = musb_readw(fifo, 0);
                                index += 2;
                        }
                } else {
                        if (len >= 2) {
                                ioread16_rep(fifo, dst, len >> 1);
                                index = len & ~0x01;
                        }
                }
                if (len & 0x01)
                        dst[index] = musb_readb(fifo, 0);
        } else  {
                /* byte aligned */
                ioread8_rep(fifo, dst, len);
        }
}
#endif

#endif  /* normal PIO */


/*-------------------------------------------------------------------------*/

/* for high speed test mode; see USB 2.0 spec 7.1.20 */
static const u8 musb_test_packet[53] = {
        /* implicit SYNC then DATA0 to start */

        /* JKJKJKJK x9 */
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        /* JJKKJJKK x8 */
        0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
        /* JJJJKKKK x8 */
        0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee,
        /* JJJJJJJKKKKKKK x8 */
        0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
        /* JJJJJJJK x8 */
        0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd,
        /* JKKKKKKK x10, JK */
        0xfc, 0x7e, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0x7e

        /* implicit CRC16 then EOP to end */
};

void musb_load_testpacket(struct musb *musb)
{
        void __iomem    *regs = musb->endpoints[0].regs;

        musb_ep_select(musb->mregs, 0);
        musb_write_fifo(musb->control_ep,
                        sizeof(musb_test_packet), musb_test_packet);
        musb_writew(regs, MUSB_CSR0, MUSB_CSR0_TXPKTRDY);
}

/*-------------------------------------------------------------------------*/

/*
 * Handles OTG hnp timeouts, such as b_ase0_brst
 */
static void musb_otg_timer_func(unsigned long data)
{
        struct musb     *musb = (struct musb *)data;
        unsigned long   flags;

        spin_lock_irqsave(&musb->lock, flags);
        switch (musb->xceiv->state) {
        case OTG_STATE_B_WAIT_ACON:
                dev_dbg(musb->controller, "HNP: b_wait_acon timeout; back to b_peripheral\n");
                musb_g_disconnect(musb);
                musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
                musb->is_active = 0;
                break;
        case OTG_STATE_A_SUSPEND:
        case OTG_STATE_A_WAIT_BCON:
                dev_dbg(musb->controller, "HNP: %s timeout\n",
                        usb_otg_state_string(musb->xceiv->state));
                musb_platform_set_vbus(musb, 0);
                musb->xceiv->state = OTG_STATE_A_WAIT_VFALL;
                break;
        default:
                dev_dbg(musb->controller, "HNP: Unhandled mode %s\n",
                        usb_otg_state_string(musb->xceiv->state));
        }
        spin_unlock_irqrestore(&musb->lock, flags);
}

/*
 * Stops the HNP transition. Caller must take care of locking.
 */
void musb_hnp_stop(struct musb *musb)
{
        struct usb_hcd  *hcd = musb->hcd;
        void __iomem    *mbase = musb->mregs;
        u8      reg;

        dev_dbg(musb->controller, "HNP: stop from %s\n",
                        usb_otg_state_string(musb->xceiv->state));

        switch (musb->xceiv->state) {
        case OTG_STATE_A_PERIPHERAL:
                musb_g_disconnect(musb);
                dev_dbg(musb->controller, "HNP: back to %s\n",
                        usb_otg_state_string(musb->xceiv->state));
                break;
        case OTG_STATE_B_HOST:
                dev_dbg(musb->controller, "HNP: Disabling HR\n");
                if (hcd)
                        hcd->self.is_b_host = 0;
                musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
                MUSB_DEV_MODE(musb);
                reg = musb_readb(mbase, MUSB_POWER);
                reg |= MUSB_POWER_SUSPENDM;
                musb_writeb(mbase, MUSB_POWER, reg);
                /* REVISIT: Start SESSION_REQUEST here? */
                break;
        default:
                dev_dbg(musb->controller, "HNP: Stopping in unknown state %s\n",
                        usb_otg_state_string(musb->xceiv->state));
        }

        /*
         * When returning to A state after HNP, avoid hub_port_rebounce(),
         * which cause occasional OPT A "Did not receive reset after connect"
         * errors.
         */
        musb->port1_status &= ~(USB_PORT_STAT_C_CONNECTION << 16);
}

/*
 * Interrupt Service Routine to record USB "global" interrupts.
 * Since these do not happen often and signify things of
 * paramount importance, it seems OK to check them individually;
 * the order of the tests is specified in the manual
 *
 * @param musb instance pointer
 * @param int_usb register contents
 * @param devctl
 * @param power
 */

static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
                                u8 devctl)
{
        struct usb_otg *otg = musb->xceiv->otg;
        irqreturn_t handled = IRQ_NONE;

        dev_dbg(musb->controller, "<== DevCtl=%02x, int_usb=0x%x\n", devctl,
                int_usb);

        /* in host mode, the peripheral may issue remote wakeup.
         * in peripheral mode, the host may resume the link.
         * spurious RESUME irqs happen too, paired with SUSPEND.
         */
        if (int_usb & MUSB_INTR_RESUME) {
                handled = IRQ_HANDLED;
                dev_dbg(musb->controller, "RESUME (%s)\n", usb_otg_state_string(musb->xceiv->state));

                if (devctl & MUSB_DEVCTL_HM) {
                        void __iomem *mbase = musb->mregs;
                        u8 power;

                        switch (musb->xceiv->state) {
                        case OTG_STATE_A_SUSPEND:
                                /* remote wakeup?  later, GetPortStatus
                                 * will stop RESUME signaling
                                 */

                                power = musb_readb(musb->mregs, MUSB_POWER);
                                if (power & MUSB_POWER_SUSPENDM) {
                                        /* spurious */
                                        musb->int_usb &= ~MUSB_INTR_SUSPEND;
                                        dev_dbg(musb->controller, "Spurious SUSPENDM\n");
                                        break;
                                }

                                power &= ~MUSB_POWER_SUSPENDM;
                                musb_writeb(mbase, MUSB_POWER,
                                                power | MUSB_POWER_RESUME);

                                musb->port1_status |=
                                                (USB_PORT_STAT_C_SUSPEND << 16)
                                                | MUSB_PORT_STAT_RESUME;
                                schedule_delayed_work(
                                        &musb->finish_resume_work, 20);

                                musb->xceiv->state = OTG_STATE_A_HOST;
                                musb->is_active = 1;
                                musb_host_resume_root_hub(musb);
                                break;
                        case OTG_STATE_B_WAIT_ACON:
                                musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
                                musb->is_active = 1;
                                MUSB_DEV_MODE(musb);
                                break;
                        default:
                                WARNING("bogus %s RESUME (%s)\n",
                                        "host",
                                        usb_otg_state_string(musb->xceiv->state));
                        }
                } else {
                        switch (musb->xceiv->state) {
                        case OTG_STATE_A_SUSPEND:
                                /* possibly DISCONNECT is upcoming */
                                musb->xceiv->state = OTG_STATE_A_HOST;
                                musb_host_resume_root_hub(musb);
                                break;
                        case OTG_STATE_B_WAIT_ACON:
                        case OTG_STATE_B_PERIPHERAL:
                                /* disconnect while suspended?  we may
                                 * not get a disconnect irq...
                                 */
                                if ((devctl & MUSB_DEVCTL_VBUS)
                                                != (3 << MUSB_DEVCTL_VBUS_SHIFT)
                                                ) {
                                        musb->int_usb |= MUSB_INTR_DISCONNECT;
                                        musb->int_usb &= ~MUSB_INTR_SUSPEND;
                                        break;
                                }
                                musb_g_resume(musb);
                                break;
                        case OTG_STATE_B_IDLE:
                                musb->int_usb &= ~MUSB_INTR_SUSPEND;
                                break;
                        default:
                                WARNING("bogus %s RESUME (%s)\n",
                                        "peripheral",
                                        usb_otg_state_string(musb->xceiv->state));
                        }
                }
        }

        /* see manual for the order of the tests */
        if (int_usb & MUSB_INTR_SESSREQ) {
                void __iomem *mbase = musb->mregs;

                if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS
                                && (devctl & MUSB_DEVCTL_BDEVICE)) {
                        dev_dbg(musb->controller, "SessReq while on B state\n");
                        return IRQ_HANDLED;
                }

                dev_dbg(musb->controller, "SESSION_REQUEST (%s)\n",
                        usb_otg_state_string(musb->xceiv->state));

                /* IRQ arrives from ID pin sense or (later, if VBUS power
                 * is removed) SRP.  responses are time critical:
                 *  - turn on VBUS (with silicon-specific mechanism)
                 *  - go through A_WAIT_VRISE
                 *  - ... to A_WAIT_BCON.
                 * a_wait_vrise_tmout triggers VBUS_ERROR transitions
                 */
                musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
                musb->ep0_stage = MUSB_EP0_START;
                musb->xceiv->state = OTG_STATE_A_IDLE;
                MUSB_HST_MODE(musb);
                musb_platform_set_vbus(musb, 1);

                handled = IRQ_HANDLED;
        }

        if (int_usb & MUSB_INTR_VBUSERROR) {
                int     ignore = 0;

                /* During connection as an A-Device, we may see a short
                 * current spikes causing voltage drop, because of cable
                 * and peripheral capacitance combined with vbus draw.
                 * (So: less common with truly self-powered devices, where
                 * vbus doesn't act like a power supply.)
                 *
                 * Such spikes are short; usually less than ~500 usec, max
                 * of ~2 msec.  That is, they're not sustained overcurrent
                 * errors, though they're reported using VBUSERROR irqs.
                 *
                 * Workarounds:  (a) hardware: use self powered devices.
                 * (b) software:  ignore non-repeated VBUS errors.
                 *
                 * REVISIT:  do delays from lots of DEBUG_KERNEL checks
                 * make trouble here, keeping VBUS < 4.4V ?
                 */
                switch (musb->xceiv->state) {
                case OTG_STATE_A_HOST:
                        /* recovery is dicey once we've gotten past the
                         * initial stages of enumeration, but if VBUS
                         * stayed ok at the other end of the link, and
                         * another reset is due (at least for high speed,
                         * to redo the chirp etc), it might work OK...
                         */
                case OTG_STATE_A_WAIT_BCON:
                case OTG_STATE_A_WAIT_VRISE:
                        if (musb->vbuserr_retry) {
                                void __iomem *mbase = musb->mregs;

                                musb->vbuserr_retry--;
                                ignore = 1;
                                devctl |= MUSB_DEVCTL_SESSION;
                                musb_writeb(mbase, MUSB_DEVCTL, devctl);
                        } else {
                                musb->port1_status |=
                                          USB_PORT_STAT_OVERCURRENT
                                        | (USB_PORT_STAT_C_OVERCURRENT << 16);
                        }
                        break;
                default:
                        break;
                }

                dev_printk(ignore ? KERN_DEBUG : KERN_ERR, musb->controller,
                                "VBUS_ERROR in %s (%02x, %s), retry #%d, port1 %08x\n",
                                usb_otg_state_string(musb->xceiv->state),
                                devctl,
                                ({ char *s;
                                switch (devctl & MUSB_DEVCTL_VBUS) {
                                case 0 << MUSB_DEVCTL_VBUS_SHIFT:
                                        s = "<SessEnd"; break;
                                case 1 << MUSB_DEVCTL_VBUS_SHIFT:
                                        s = "<AValid"; break;
                                case 2 << MUSB_DEVCTL_VBUS_SHIFT:
                                        s = "<VBusValid"; break;
                                /* case 3 << MUSB_DEVCTL_VBUS_SHIFT: */
                                default:
                                        s = "VALID"; break;
                                } s; }),
                                VBUSERR_RETRY_COUNT - musb->vbuserr_retry,
                                musb->port1_status);

                /* go through A_WAIT_VFALL then start a new session */
                if (!ignore)
                        musb_platform_set_vbus(musb, 0);
                handled = IRQ_HANDLED;
        }

        if (int_usb & MUSB_INTR_SUSPEND) {
                dev_dbg(musb->controller, "SUSPEND (%s) devctl %02x\n",
                        usb_otg_state_string(musb->xceiv->state), devctl);
                handled = IRQ_HANDLED;

                switch (musb->xceiv->state) {
                case OTG_STATE_A_PERIPHERAL:
                        /* We also come here if the cable is removed, since
                         * this silicon doesn't report ID-no-longer-grounded.
                         *
                         * We depend on T(a_wait_bcon) to shut us down, and
                         * hope users don't do anything dicey during this
                         * undesired detour through A_WAIT_BCON.
                         */
                        musb_hnp_stop(musb);
                        musb_host_resume_root_hub(musb);
                        musb_root_disconnect(musb);
                        musb_platform_try_idle(musb, jiffies
                                        + msecs_to_jiffies(musb->a_wait_bcon
                                                ? : OTG_TIME_A_WAIT_BCON));

                        break;
                case OTG_STATE_B_IDLE:
                        if (!musb->is_active)
                                break;
                case OTG_STATE_B_PERIPHERAL:
                        musb_g_suspend(musb);
                        musb->is_active = otg->gadget->b_hnp_enable;
                        if (musb->is_active) {
                                musb->xceiv->state = OTG_STATE_B_WAIT_ACON;
                                dev_dbg(musb->controller, "HNP: Setting timer for b_ase0_brst\n");
                                mod_timer(&musb->otg_timer, jiffies
                                        + msecs_to_jiffies(
                                                        OTG_TIME_B_ASE0_BRST));
                        }
                        break;
                case OTG_STATE_A_WAIT_BCON:
                        if (musb->a_wait_bcon != 0)
                                musb_platform_try_idle(musb, jiffies
                                        + msecs_to_jiffies(musb->a_wait_bcon));
                        break;
                case OTG_STATE_A_HOST:
                        musb->xceiv->state = OTG_STATE_A_SUSPEND;
                        musb->is_active = otg->host->b_hnp_enable;
                        break;
                case OTG_STATE_B_HOST:
                        /* Transition to B_PERIPHERAL, see 6.8.2.6 p 44 */
                        dev_dbg(musb->controller, "REVISIT: SUSPEND as B_HOST\n");
                        break;
                default:
                        /* "should not happen" */
                        musb->is_active = 0;
                        break;
                }
        }

        if (int_usb & MUSB_INTR_CONNECT) {
                struct usb_hcd *hcd = musb->hcd;

                handled = IRQ_HANDLED;
                musb->is_active = 1;

                musb->ep0_stage = MUSB_EP0_START;

                /* flush endpoints when transitioning from Device Mode */
                if (is_peripheral_active(musb)) {
                        /* REVISIT HNP; just force disconnect */
                }
                musb->intrtxe = musb->epmask;
                musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe);
                musb->intrrxe = musb->epmask & 0xfffe;
                musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe);
                musb_writeb(musb->mregs, MUSB_INTRUSBE, 0xf7);
                musb->port1_status &= ~(USB_PORT_STAT_LOW_SPEED
                                        |USB_PORT_STAT_HIGH_SPEED
                                        |USB_PORT_STAT_ENABLE
                                        );
                musb->port1_status |= USB_PORT_STAT_CONNECTION
                                        |(USB_PORT_STAT_C_CONNECTION << 16);

                /* high vs full speed is just a guess until after reset */
                if (devctl & MUSB_DEVCTL_LSDEV)
                        musb->port1_status |= USB_PORT_STAT_LOW_SPEED;

                /* indicate new connection to OTG machine */
                switch (musb->xceiv->state) {
                case OTG_STATE_B_PERIPHERAL:
                        if (int_usb & MUSB_INTR_SUSPEND) {
                                dev_dbg(musb->controller, "HNP: SUSPEND+CONNECT, now b_host\n");
                                int_usb &= ~MUSB_INTR_SUSPEND;
                                goto b_host;
                        } else
                                dev_dbg(musb->controller, "CONNECT as b_peripheral???\n");
                        break;
                case OTG_STATE_B_WAIT_ACON:
                        dev_dbg(musb->controller, "HNP: CONNECT, now b_host\n");
b_host:
                        musb->xceiv->state = OTG_STATE_B_HOST;
                        if (musb->hcd)
                                musb->hcd->self.is_b_host = 1;
                        del_timer(&musb->otg_timer);
                        break;
                default:
                        if ((devctl & MUSB_DEVCTL_VBUS)
                                        == (3 << MUSB_DEVCTL_VBUS_SHIFT)) {
                                musb->xceiv->state = OTG_STATE_A_HOST;
                                if (hcd)
                                        hcd->self.is_b_host = 0;
                        }
                        break;
                }

                musb_host_poke_root_hub(musb);

                dev_dbg(musb->controller, "CONNECT (%s) devctl %02x\n",
                                usb_otg_state_string(musb->xceiv->state), devctl);
        }

        if (int_usb & MUSB_INTR_DISCONNECT) {
                dev_dbg(musb->controller, "DISCONNECT (%s) as %s, devctl %02x\n",
                                usb_otg_state_string(musb->xceiv->state),
                                MUSB_MODE(musb), devctl);
                handled = IRQ_HANDLED;

                switch (musb->xceiv->state) {
                case OTG_STATE_A_HOST:
                case OTG_STATE_A_SUSPEND:
                        musb_host_resume_root_hub(musb);
                        musb_root_disconnect(musb);
                        if (musb->a_wait_bcon != 0)
                                musb_platform_try_idle(musb, jiffies
                                        + msecs_to_jiffies(musb->a_wait_bcon));
                        break;
                case OTG_STATE_B_HOST:
                        /* REVISIT this behaves for "real disconnect"
                         * cases; make sure the other transitions from
                         * from B_HOST act right too.  The B_HOST code
                         * in hnp_stop() is currently not used...
                         */
                        musb_root_disconnect(musb);
                        if (musb->hcd)
                                musb->hcd->self.is_b_host = 0;
                        musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
                        MUSB_DEV_MODE(musb);
                        musb_g_disconnect(musb);
                        break;
                case OTG_STATE_A_PERIPHERAL:
                        musb_hnp_stop(musb);
                        musb_root_disconnect(musb);
                        /* FALLTHROUGH */
                case OTG_STATE_B_WAIT_ACON:
                        /* FALLTHROUGH */
                case OTG_STATE_B_PERIPHERAL:
                case OTG_STATE_B_IDLE:
                        musb_g_disconnect(musb);
                        break;
                default:
                        WARNING("unhandled DISCONNECT transition (%s)\n",
                                usb_otg_state_string(musb->xceiv->state));
                        break;
                }
        }

        /* mentor saves a bit: bus reset and babble share the same irq.
         * only host sees babble; only peripheral sees bus reset.
         */
        if (int_usb & MUSB_INTR_RESET) {
                handled = IRQ_HANDLED;
                if ((devctl & MUSB_DEVCTL_HM) != 0) {
                        /*
                         * Looks like non-HS BABBLE can be ignored, but
                         * HS BABBLE is an error condition. For HS the solution
                         * is to avoid babble in the first place and fix what
                         * caused BABBLE. When HS BABBLE happens we can only
                         * stop the session.
                         */
                        if (devctl & (MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV))
                                dev_dbg(musb->controller, "BABBLE devctl: %02x\n", devctl);
                        else {
                                ERR("Stopping host session -- babble\n");
                                musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
                        }
                } else {
                        dev_dbg(musb->controller, "BUS RESET as %s\n",
                                usb_otg_state_string(musb->xceiv->state));
                        switch (musb->xceiv->state) {
                        case OTG_STATE_A_SUSPEND:
                                musb_g_reset(musb);
                                /* FALLTHROUGH */
                        case OTG_STATE_A_WAIT_BCON:     /* OPT TD.4.7-900ms */
                                /* never use invalid T(a_wait_bcon) */
                                dev_dbg(musb->controller, "HNP: in %s, %d msec timeout\n",
                                        usb_otg_state_string(musb->xceiv->state),
                                        TA_WAIT_BCON(musb));
                                mod_timer(&musb->otg_timer, jiffies
                                        + msecs_to_jiffies(TA_WAIT_BCON(musb)));
                                break;
                        case OTG_STATE_A_PERIPHERAL:
                                del_timer(&musb->otg_timer);
                                musb_g_reset(musb);
                                break;
                        case OTG_STATE_B_WAIT_ACON:
                                dev_dbg(musb->controller, "HNP: RESET (%s), to b_peripheral\n",
                                        usb_otg_state_string(musb->xceiv->state));
                                musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
                                musb_g_reset(musb);
                                break;
                        case OTG_STATE_B_IDLE:
                                musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
                                /* FALLTHROUGH */
                        case OTG_STATE_B_PERIPHERAL:
                                musb_g_reset(musb);
                                break;
                        default:
                                dev_dbg(musb->controller, "Unhandled BUS RESET as %s\n",
                                        usb_otg_state_string(musb->xceiv->state));
                        }
                }
        }

#if 0
/* REVISIT ... this would be for multiplexing periodic endpoints, or
 * supporting transfer phasing to prevent exceeding ISO bandwidth
 * limits of a given frame or microframe.
 *
 * It's not needed for peripheral side, which dedicates endpoints;
 * though it _might_ use SOF irqs for other purposes.
 *
 * And it's not currently needed for host side, which also dedicates
 * endpoints, relies on TX/RX interval registers, and isn't claimed
 * to support ISO transfers yet.
 */
        if (int_usb & MUSB_INTR_SOF) {
                void __iomem *mbase = musb->mregs;
                struct musb_hw_ep       *ep;
                u8 epnum;
                u16 frame;

                dev_dbg(musb->controller, "START_OF_FRAME\n");
                handled = IRQ_HANDLED;

                /* start any periodic Tx transfers waiting for current frame */
                frame = musb_readw(mbase, MUSB_FRAME);
                ep = musb->endpoints;
                for (epnum = 1; (epnum < musb->nr_endpoints)
                                        && (musb->epmask >= (1 << epnum));
                                epnum++, ep++) {
                        /*
                         * FIXME handle framecounter wraps (12 bits)
                         * eliminate duplicated StartUrb logic
                         */
                        if (ep->dwWaitFrame >= frame) {
                                ep->dwWaitFrame = 0;
                                pr_debug("SOF --> periodic TX%s on %d\n",
                                        ep->tx_channel ? " DMA" : "",
                                        epnum);
                                if (!ep->tx_channel)
                                        musb_h_tx_start(musb, epnum);
                                else
                                        cppi_hostdma_start(musb, epnum);
                        }
                }               /* end of for loop */
        }
#endif

        schedule_work(&musb->irq_work);

        return handled;
}

/*-------------------------------------------------------------------------*/

static void musb_generic_disable(struct musb *musb)
{
        void __iomem    *mbase = musb->mregs;
        u16     temp;

        /* disable interrupts */
        musb_writeb(mbase, MUSB_INTRUSBE, 0);
        musb->intrtxe = 0;
        musb_writew(mbase, MUSB_INTRTXE, 0);
        musb->intrrxe = 0;
        musb_writew(mbase, MUSB_INTRRXE, 0);

        /* off */
        musb_writeb(mbase, MUSB_DEVCTL, 0);

        /*  flush pending interrupts */
        temp = musb_readb(mbase, MUSB_INTRUSB);
        temp = musb_readw(mbase, MUSB_INTRTX);
        temp = musb_readw(mbase, MUSB_INTRRX);

}

/*
 * Program the HDRC to start (enable interrupts, dma, etc.).
 */
void musb_start(struct musb *musb)
{
        void __iomem    *regs = musb->mregs;
        u8              devctl = musb_readb(regs, MUSB_DEVCTL);

        dev_dbg(musb->controller, "<== devctl %02x\n", devctl);

        /*  Set INT enable registers, enable interrupts */
        musb->intrtxe = musb->epmask;
        musb_writew(regs, MUSB_INTRTXE, musb->intrtxe);
        musb->intrrxe = musb->epmask & 0xfffe;
        musb_writew(regs, MUSB_INTRRXE, musb->intrrxe);
        musb_writeb(regs, MUSB_INTRUSBE, 0xf7);

        musb_writeb(regs, MUSB_TESTMODE, 0);

        /* put into basic highspeed mode and start session */
        musb_writeb(regs, MUSB_POWER, MUSB_POWER_ISOUPDATE
                        | MUSB_POWER_HSENAB
                        /* ENSUSPEND wedges tusb */
                        /* | MUSB_POWER_ENSUSPEND */
                   );

        musb->is_active = 0;
        devctl = musb_readb(regs, MUSB_DEVCTL);
        devctl &= ~MUSB_DEVCTL_SESSION;

        /* session started after:
         * (a) ID-grounded irq, host mode;
         * (b) vbus present/connect IRQ, peripheral mode;
         * (c) peripheral initiates, using SRP
         */
        if (musb->port_mode != MUSB_PORT_MODE_HOST &&
                        (devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) {
                musb->is_active = 1;
        } else {
                devctl |= MUSB_DEVCTL_SESSION;
        }

        musb_platform_enable(musb);
        musb_writeb(regs, MUSB_DEVCTL, devctl);
}

/*
 * Make the HDRC stop (disable interrupts, etc.);
 * reversible by musb_start
 * called on gadget driver unregister
 * with controller locked, irqs blocked
 * acts as a NOP unless some role activated the hardware
 */
void musb_stop(struct musb *musb)
{
        /* stop IRQs, timers, ... */
        musb_platform_disable(musb);
        musb_generic_disable(musb);
        dev_dbg(musb->controller, "HDRC disabled\n");

        /* FIXME
         *  - mark host and/or peripheral drivers unusable/inactive
         *  - disable DMA (and enable it in HdrcStart)
         *  - make sure we can musb_start() after musb_stop(); with
         *    OTG mode, gadget driver module rmmod/modprobe cycles that
         *  - ...
         */
        musb_platform_try_idle(musb, 0);
}

static void musb_shutdown(struct platform_device *pdev)
{
        struct musb     *musb = dev_to_musb(&pdev->dev);
        unsigned long   flags;

        pm_runtime_get_sync(musb->controller);

        musb_host_cleanup(musb);
        musb_gadget_cleanup(musb);

        spin_lock_irqsave(&musb->lock, flags);
        musb_platform_disable(musb);
        musb_generic_disable(musb);
        spin_unlock_irqrestore(&musb->lock, flags);

        musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
        musb_platform_exit(musb);

        pm_runtime_put(musb->controller);
        /* FIXME power down */
}


/*-------------------------------------------------------------------------*/

/*
 * The silicon either has hard-wired endpoint configurations, or else
 * "dynamic fifo" sizing.  The driver has support for both, though at this
 * writing only the dynamic sizing is very well tested.   Since we switched
 * away from compile-time hardware parameters, we can no longer rely on
 * dead code elimination to leave only the relevant one in the object file.
 *
 * We don't currently use dynamic fifo setup capability to do anything
 * more than selecting one of a bunch of predefined configurations.
 */
#if defined(CONFIG_USB_MUSB_TUSB6010)                   \
        || defined(CONFIG_USB_MUSB_TUSB6010_MODULE)     \
        || defined(CONFIG_USB_MUSB_OMAP2PLUS)           \
        || defined(CONFIG_USB_MUSB_OMAP2PLUS_MODULE)    \
        || defined(CONFIG_USB_MUSB_AM35X)               \
        || defined(CONFIG_USB_MUSB_AM35X_MODULE)        \
        || defined(CONFIG_USB_MUSB_DSPS)                \
        || defined(CONFIG_USB_MUSB_DSPS_MODULE)
static ushort fifo_mode = 4;
#elif defined(CONFIG_USB_MUSB_UX500)                    \
        || defined(CONFIG_USB_MUSB_UX500_MODULE)
static ushort fifo_mode = 5;
#else
static ushort fifo_mode = 2;
#endif

/* "modprobe ... fifo_mode=1" etc */
module_param(fifo_mode, ushort, 0);
MODULE_PARM_DESC(fifo_mode, "initial endpoint configuration");

/*
 * tables defining fifo_mode values.  define more if you like.
 * for host side, make sure both halves of ep1 are set up.
 */

/* mode 0 - fits in 2KB */
static struct musb_fifo_cfg mode_0_cfg[] = {
{ .hw_ep_num = 1, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num = 1, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, },
{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
};

/* mode 1 - fits in 4KB */
static struct musb_fifo_cfg mode_1_cfg[] = {
{ .hw_ep_num = 1, .style = FIFO_TX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
{ .hw_ep_num = 1, .style = FIFO_RX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
{ .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, .mode = BUF_DOUBLE, },
{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
};

/* mode 2 - fits in 4KB */
static struct musb_fifo_cfg mode_2_cfg[] = {
{ .hw_ep_num = 1, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num = 1, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
};

/* mode 3 - fits in 4KB */
static struct musb_fifo_cfg mode_3_cfg[] = {
{ .hw_ep_num = 1, .style = FIFO_TX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
{ .hw_ep_num = 1, .style = FIFO_RX,   .maxpacket = 512, .mode = BUF_DOUBLE, },
{ .hw_ep_num = 2, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, },
{ .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, },
};

/* mode 4 - fits in 16KB */
static struct musb_fifo_cfg mode_4_cfg[] = {
{ .hw_ep_num =  1, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num =  1, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num =  2, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num =  2, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num =  3, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num =  3, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num =  4, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num =  4, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num =  5, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num =  5, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num =  6, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num =  6, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num =  7, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num =  7, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num =  8, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num =  8, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num =  9, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num =  9, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num = 10, .style = FIFO_TX,   .maxpacket = 256, },
{ .hw_ep_num = 10, .style = FIFO_RX,   .maxpacket = 64, },
{ .hw_ep_num = 11, .style = FIFO_TX,   .maxpacket = 256, },
{ .hw_ep_num = 11, .style = FIFO_RX,   .maxpacket = 64, },
{ .hw_ep_num = 12, .style = FIFO_TX,   .maxpacket = 256, },
{ .hw_ep_num = 12, .style = FIFO_RX,   .maxpacket = 64, },
{ .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 4096, },
{ .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
{ .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
};

/* mode 5 - fits in 8KB */
static struct musb_fifo_cfg mode_5_cfg[] = {
{ .hw_ep_num =  1, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num =  1, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num =  2, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num =  2, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num =  3, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num =  3, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num =  4, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num =  4, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num =  5, .style = FIFO_TX,   .maxpacket = 512, },
{ .hw_ep_num =  5, .style = FIFO_RX,   .maxpacket = 512, },
{ .hw_ep_num =  6, .style = FIFO_TX,   .maxpacket = 32, },
{ .hw_ep_num =  6, .style = FIFO_RX,   .maxpacket = 32, },
{ .hw_ep_num =  7, .style = FIFO_TX,   .maxpacket = 32, },
{ .hw_ep_num =  7, .style = FIFO_RX,   .maxpacket = 32, },
{ .hw_ep_num =  8, .style = FIFO_TX,   .maxpacket = 32, },
{ .hw_ep_num =  8, .style = FIFO_RX,   .maxpacket = 32, },
{ .hw_ep_num =  9, .style = FIFO_TX,   .maxpacket = 32, },
{ .hw_ep_num =  9, .style = FIFO_RX,   .maxpacket = 32, },
{ .hw_ep_num = 10, .style = FIFO_TX,   .maxpacket = 32, },
{ .hw_ep_num = 10, .style = FIFO_RX,   .maxpacket = 32, },
{ .hw_ep_num = 11, .style = FIFO_TX,   .maxpacket = 32, },
{ .hw_ep_num = 11, .style = FIFO_RX,   .maxpacket = 32, },
{ .hw_ep_num = 12, .style = FIFO_TX,   .maxpacket = 32, },
{ .hw_ep_num = 12, .style = FIFO_RX,   .maxpacket = 32, },
{ .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 512, },
{ .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
{ .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
};

/*
 * configure a fifo; for non-shared endpoints, this may be called
 * once for a tx fifo and once for an rx fifo.
 *
 * returns negative errno or offset for next fifo.
 */
static int
fifo_setup(struct musb *musb, struct musb_hw_ep  *hw_ep,
                const struct musb_fifo_cfg *cfg, u16 offset)
{
        void __iomem    *mbase = musb->mregs;
        int     size = 0;
        u16     maxpacket = cfg->maxpacket;
        u16     c_off = offset >> 3;
        u8      c_size;

        /* expect hw_ep has already been zero-initialized */

        size = ffs(max(maxpacket, (u16) 8)) - 1;
        maxpacket = 1 << size;

        c_size = size - 3;
        if (cfg->mode == BUF_DOUBLE) {
                if ((offset + (maxpacket << 1)) >
                                (1 << (musb->config->ram_bits + 2)))
                        return -EMSGSIZE;
                c_size |= MUSB_FIFOSZ_DPB;
        } else {
                if ((offset + maxpacket) > (1 << (musb->config->ram_bits + 2)))
                        return -EMSGSIZE;
        }

        /* configure the FIFO */
        musb_writeb(mbase, MUSB_INDEX, hw_ep->epnum);

        /* EP0 reserved endpoint for control, bidirectional;
         * EP1 reserved for bulk, two unidirectional halves.
         */
        if (hw_ep->epnum == 1)
                musb->bulk_ep = hw_ep;
        /* REVISIT error check:  be sure ep0 can both rx and tx ... */
        switch (cfg->style) {
        case FIFO_TX:
                musb_write_txfifosz(mbase, c_size);
                musb_write_txfifoadd(mbase, c_off);
                hw_ep->tx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
                hw_ep->max_packet_sz_tx = maxpacket;
                break;
        case FIFO_RX:
                musb_write_rxfifosz(mbase, c_size);
                musb_write_rxfifoadd(mbase, c_off);
                hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
                hw_ep->max_packet_sz_rx = maxpacket;
                break;
        case FIFO_RXTX:
                musb_write_txfifosz(mbase, c_size);
                musb_write_txfifoadd(mbase, c_off);
                hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB);
                hw_ep->max_packet_sz_rx = maxpacket;

                musb_write_rxfifosz(mbase, c_size);
                musb_write_rxfifoadd(mbase, c_off);
                hw_ep->tx_double_buffered = hw_ep->rx_double_buffered;
                hw_ep->max_packet_sz_tx = maxpacket;

                hw_ep->is_shared_fifo = true;
                break;
        }

        /* NOTE rx and tx endpoint irqs aren't managed separately,
         * which happens to be ok
         */
        musb->epmask |= (1 << hw_ep->epnum);

        return offset + (maxpacket << ((c_size & MUSB_FIFOSZ_DPB) ? 1 : 0));
}

static struct musb_fifo_cfg ep0_cfg = {
        .style = FIFO_RXTX, .maxpacket = 64,
};

static int ep_config_from_table(struct musb *musb)
{
        const struct musb_fifo_cfg      *cfg;
        unsigned                i, n;
        int                     offset;
        struct musb_hw_ep       *hw_ep = musb->endpoints;

        if (musb->config->fifo_cfg) {
                cfg = musb->config->fifo_cfg;
                n = musb->config->fifo_cfg_size;
                goto done;
        }

        switch (fifo_mode) {
        default:
                fifo_mode = 0;
                /* FALLTHROUGH */
        case 0:
                cfg = mode_0_cfg;
                n = ARRAY_SIZE(mode_0_cfg);
                break;
        case 1:
                cfg = mode_1_cfg;
                n = ARRAY_SIZE(mode_1_cfg);
                break;
        case 2:
                cfg = mode_2_cfg;
                n = ARRAY_SIZE(mode_2_cfg);
                break;
        case 3:
                cfg = mode_3_cfg;
                n = ARRAY_SIZE(mode_3_cfg);
                break;
        case 4:
                cfg = mode_4_cfg;
                n = ARRAY_SIZE(mode_4_cfg);
                break;
        case 5:
                cfg = mode_5_cfg;
                n = ARRAY_SIZE(mode_5_cfg);
                break;
        }

        printk(KERN_DEBUG "%s: setup fifo_mode %d\n",
                        musb_driver_name, fifo_mode);


done:
        offset = fifo_setup(musb, hw_ep, &ep0_cfg, 0);
        /* assert(offset > 0) */

        /* NOTE:  for RTL versions >= 1.400 EPINFO and RAMINFO would
         * be better than static musb->config->num_eps and DYN_FIFO_SIZE...
         */

        for (i = 0; i < n; i++) {
                u8      epn = cfg->hw_ep_num;

                if (epn >= musb->config->num_eps) {
                        pr_debug("%s: invalid ep %d\n",
                                        musb_driver_name, epn);
                        return -EINVAL;
                }
                offset = fifo_setup(musb, hw_ep + epn, cfg++, offset);
                if (offset < 0) {
                        pr_debug("%s: mem overrun, ep %d\n",
                                        musb_driver_name, epn);
                        return offset;
                }
                epn++;
                musb->nr_endpoints = max(epn, musb->nr_endpoints);
        }

        printk(KERN_DEBUG "%s: %d/%d max ep, %d/%d memory\n",
                        musb_driver_name,
                        n + 1, musb->config->num_eps * 2 - 1,
                        offset, (1 << (musb->config->ram_bits + 2)));

        if (!musb->bulk_ep) {
                pr_debug("%s: missing bulk\n", musb_driver_name);
                return -EINVAL;
        }

        return 0;
}


/*
 * ep_config_from_hw - when MUSB_C_DYNFIFO_DEF is false
 * @param musb the controller
 */
static int ep_config_from_hw(struct musb *musb)
{
        u8 epnum = 0;
        struct musb_hw_ep *hw_ep;
        void __iomem *mbase = musb->mregs;
        int ret = 0;

        dev_dbg(musb->controller, "<== static silicon ep config\n");

        /* FIXME pick up ep0 maxpacket size */

        for (epnum = 1; epnum < musb->config->num_eps; epnum++) {
                musb_ep_select(mbase, epnum);
                hw_ep = musb->endpoints + epnum;

                ret = musb_read_fifosize(musb, hw_ep, epnum);
                if (ret < 0)
                        break;

                /* FIXME set up hw_ep->{rx,tx}_double_buffered */

                /* pick an RX/TX endpoint for bulk */
                if (hw_ep->max_packet_sz_tx < 512
                                || hw_ep->max_packet_sz_rx < 512)
                        continue;

                /* REVISIT:  this algorithm is lazy, we should at least
                 * try to pick a double buffered endpoint.
                 */
                if (musb->bulk_ep)
                        continue;
                musb->bulk_ep = hw_ep;
        }

        if (!musb->bulk_ep) {
                pr_debug("%s: missing bulk\n", musb_driver_name);
                return -EINVAL;
        }

        return 0;
}

enum { MUSB_CONTROLLER_MHDRC, MUSB_CONTROLLER_HDRC, };

/* Initialize MUSB (M)HDRC part of the USB hardware subsystem;
 * configure endpoints, or take their config from silicon
 */
static int musb_core_init(u16 musb_type, struct musb *musb)
{
        u8 reg;
        char *type;
        char aInfo[90], aRevision[32], aDate[12];
        void __iomem    *mbase = musb->mregs;
        int             status = 0;
        int             i;

        /* log core options (read using indexed model) */
        reg = musb_read_configdata(mbase);

        strcpy(aInfo, (reg & MUSB_CONFIGDATA_UTMIDW) ? "UTMI-16" : "UTMI-8");
        if (reg & MUSB_CONFIGDATA_DYNFIFO) {
                strcat(aInfo, ", dyn FIFOs");
                musb->dyn_fifo = true;
        }
        if (reg & MUSB_CONFIGDATA_MPRXE) {
                strcat(aInfo, ", bulk combine");
                musb->bulk_combine = true;
        }
        if (reg & MUSB_CONFIGDATA_MPTXE) {
                strcat(aInfo, ", bulk split");
                musb->bulk_split = true;
        }
        if (reg & MUSB_CONFIGDATA_HBRXE) {
                strcat(aInfo, ", HB-ISO Rx");
                musb->hb_iso_rx = true;
        }
        if (reg & MUSB_CONFIGDATA_HBTXE) {
                strcat(aInfo, ", HB-ISO Tx");
                musb->hb_iso_tx = true;
        }
        if (reg & MUSB_CONFIGDATA_SOFTCONE)
                strcat(aInfo, ", SoftConn");

        printk(KERN_DEBUG "%s: ConfigData=0x%02x (%s)\n",
                        musb_driver_name, reg, aInfo);

        aDate[0] = 0;
        if (MUSB_CONTROLLER_MHDRC == musb_type) {
                musb->is_multipoint = 1;
                type = "M";
        } else {
                musb->is_multipoint = 0;
                type = "";
#ifndef CONFIG_USB_OTG_BLACKLIST_HUB
                printk(KERN_ERR
                        "%s: kernel must blacklist external hubs\n",
                        musb_driver_name);
#endif
        }

        /* log release info */
        musb->hwvers = musb_read_hwvers(mbase);
        snprintf(aRevision, 32, "%d.%d%s", MUSB_HWVERS_MAJOR(musb->hwvers),
                MUSB_HWVERS_MINOR(musb->hwvers),
                (musb->hwvers & MUSB_HWVERS_RC) ? "RC" : "");
        printk(KERN_DEBUG "%s: %sHDRC RTL version %s %s\n",
                        musb_driver_name, type, aRevision, aDate);

        /* configure ep0 */
        musb_configure_ep0(musb);

        /* discover endpoint configuration */
        musb->nr_endpoints = 1;
        musb->epmask = 1;

        if (musb->dyn_fifo)
                status = ep_config_from_table(musb);
        else
                status = ep_config_from_hw(musb);

        if (status < 0)
                return status;

        /* finish init, and print endpoint config */
        for (i = 0; i < musb->nr_endpoints; i++) {
                struct musb_hw_ep       *hw_ep = musb->endpoints + i;

                hw_ep->fifo = MUSB_FIFO_OFFSET(i) + mbase;
#if defined(CONFIG_USB_MUSB_TUSB6010) || defined (CONFIG_USB_MUSB_TUSB6010_MODULE)
                hw_ep->fifo_async = musb->async + 0x400 + MUSB_FIFO_OFFSET(i);
                hw_ep->fifo_sync = musb->sync + 0x400 + MUSB_FIFO_OFFSET(i);
                hw_ep->fifo_sync_va =
                        musb->sync_va + 0x400 + MUSB_FIFO_OFFSET(i);

                if (i == 0)
                        hw_ep->conf = mbase - 0x400 + TUSB_EP0_CONF;
                else
                        hw_ep->conf = mbase + 0x400 + (((i - 1) & 0xf) << 2);
#endif

                hw_ep->regs = MUSB_EP_OFFSET(i, 0) + mbase;
                hw_ep->target_regs = musb_read_target_reg_base(i, mbase);
                hw_ep->rx_reinit = 1;
                hw_ep->tx_reinit = 1;

                if (hw_ep->max_packet_sz_tx) {
                        dev_dbg(musb->controller,
                                "%s: hw_ep %d%s, %smax %d\n",
                                musb_driver_name, i,
                                hw_ep->is_shared_fifo ? "shared" : "tx",
                                hw_ep->tx_double_buffered
                                        ? "doublebuffer, " : "",
                                hw_ep->max_packet_sz_tx);
                }
                if (hw_ep->max_packet_sz_rx && !hw_ep->is_shared_fifo) {
                        dev_dbg(musb->controller,
                                "%s: hw_ep %d%s, %smax %d\n",
                                musb_driver_name, i,
                                "rx",
                                hw_ep->rx_double_buffered
                                        ? "doublebuffer, " : "",
                                hw_ep->max_packet_sz_rx);
                }
                if (!(hw_ep->max_packet_sz_tx || hw_ep->max_packet_sz_rx))
                        dev_dbg(musb->controller, "hw_ep %d not configured\n", i);
        }

        return 0;
}

/*-------------------------------------------------------------------------*/

/*
 * handle all the irqs defined by the HDRC core. for now we expect:  other
 * irq sources (phy, dma, etc) will be handled first, musb->int_* values
 * will be assigned, and the irq will already have been acked.
 *
 * called in irq context with spinlock held, irqs blocked
 */
irqreturn_t musb_interrupt(struct musb *musb)
{
        irqreturn_t     retval = IRQ_NONE;
        u8              devctl;
        int             ep_num;
        u32             reg;

        devctl = musb_readb(musb->mregs, MUSB_DEVCTL);

        dev_dbg(musb->controller, "** IRQ %s usb%04x tx%04x rx%04x\n",
                (devctl & MUSB_DEVCTL_HM) ? "host" : "peripheral",
                musb->int_usb, musb->int_tx, musb->int_rx);

        /* the core can interrupt us for multiple reasons; docs have
         * a generic interrupt flowchart to follow
         */
        if (musb->int_usb)
                retval |= musb_stage0_irq(musb, musb->int_usb,
                                devctl);

        /* "stage 1" is handling endpoint irqs */

        /* handle endpoint 0 first */
        if (musb->int_tx & 1) {
                if (devctl & MUSB_DEVCTL_HM)
                        retval |= musb_h_ep0_irq(musb);
                else
                        retval |= musb_g_ep0_irq(musb);
        }

        /* RX on endpoints 1-15 */
        reg = musb->int_rx >> 1;
        ep_num = 1;
        while (reg) {
                if (reg & 1) {
                        /* musb_ep_select(musb->mregs, ep_num); */
                        /* REVISIT just retval = ep->rx_irq(...) */
                        retval = IRQ_HANDLED;
                        if (devctl & MUSB_DEVCTL_HM)
                                musb_host_rx(musb, ep_num);
                        else
                                musb_g_rx(musb, ep_num);
                }

                reg >>= 1;
                ep_num++;
        }

        /* TX on endpoints 1-15 */
        reg = musb->int_tx >> 1;
        ep_num = 1;
        while (reg) {
                if (reg & 1) {
                        /* musb_ep_select(musb->mregs, ep_num); */
                        /* REVISIT just retval |= ep->tx_irq(...) */
                        retval = IRQ_HANDLED;
                        if (devctl & MUSB_DEVCTL_HM)
                                musb_host_tx(musb, ep_num);
                        else
                                musb_g_tx(musb, ep_num);
                }
                reg >>= 1;
                ep_num++;
        }

        return retval;
}
EXPORT_SYMBOL_GPL(musb_interrupt);

#ifndef CONFIG_MUSB_PIO_ONLY
static bool use_dma = 1;

/* "modprobe ... use_dma=0" etc */
module_param(use_dma, bool, 0);
MODULE_PARM_DESC(use_dma, "enable/disable use of DMA");

void musb_dma_completion(struct musb *musb, u8 epnum, u8 transmit)
{
        u8      devctl = musb_readb(musb->mregs, MUSB_DEVCTL);

        /* called with controller lock already held */

        if (!epnum) {
#ifndef CONFIG_USB_TUSB_OMAP_DMA
                if (!is_cppi_enabled()) {
                        /* endpoint 0 */
                        if (devctl & MUSB_DEVCTL_HM)
                                musb_h_ep0_irq(musb);
                        else
                                musb_g_ep0_irq(musb);
                }
#endif
        } else {
                /* endpoints 1..15 */
                if (transmit) {
                        if (devctl & MUSB_DEVCTL_HM)
                                musb_host_tx(musb, epnum);
                        else
                                musb_g_tx(musb, epnum);
                } else {
                        /* receive */
                        if (devctl & MUSB_DEVCTL_HM)
                                musb_host_rx(musb, epnum);
                        else
                                musb_g_rx(musb, epnum);
                }
        }
}
EXPORT_SYMBOL_GPL(musb_dma_completion);

#else
#define use_dma                 0
#endif

/*-------------------------------------------------------------------------*/

static ssize_t
musb_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct musb *musb = dev_to_musb(dev);
        unsigned long flags;
        int ret = -EINVAL;

        spin_lock_irqsave(&musb->lock, flags);
        ret = sprintf(buf, "%s\n", usb_otg_state_string(musb->xceiv->state));
        spin_unlock_irqrestore(&musb->lock, flags);

        return ret;
}

static ssize_t
musb_mode_store(struct device *dev, struct device_attribute *attr,
                const char *buf, size_t n)
{
        struct musb     *musb = dev_to_musb(dev);
        unsigned long   flags;
        int             status;

        spin_lock_irqsave(&musb->lock, flags);
        if (sysfs_streq(buf, "host"))
                status = musb_platform_set_mode(musb, MUSB_HOST);
        else if (sysfs_streq(buf, "peripheral"))
                status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
        else if (sysfs_streq(buf, "otg"))
                status = musb_platform_set_mode(musb, MUSB_OTG);
        else
                status = -EINVAL;
        spin_unlock_irqrestore(&musb->lock, flags);

        return (status == 0) ? n : status;
}
static DEVICE_ATTR(mode, 0644, musb_mode_show, musb_mode_store);

static ssize_t
musb_vbus_store(struct device *dev, struct device_attribute *attr,
                const char *buf, size_t n)
{
        struct musb     *musb = dev_to_musb(dev);
        unsigned long   flags;
        unsigned long   val;

        if (sscanf(buf, "%lu", &val) < 1) {
                dev_err(dev, "Invalid VBUS timeout ms value\n");
                return -EINVAL;
        }

        spin_lock_irqsave(&musb->lock, flags);
        /* force T(a_wait_bcon) to be zero/unlimited *OR* valid */
        musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ;
        if (musb->xceiv->state == OTG_STATE_A_WAIT_BCON)
                musb->is_active = 0;
        musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val));
        spin_unlock_irqrestore(&musb->lock, flags);

        return n;
}

static ssize_t
musb_vbus_show(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct musb     *musb = dev_to_musb(dev);
        unsigned long   flags;
        unsigned long   val;
        int             vbus;

        spin_lock_irqsave(&musb->lock, flags);
        val = musb->a_wait_bcon;
        /* FIXME get_vbus_status() is normally #defined as false...
         * and is effectively TUSB-specific.
         */
        vbus = musb_platform_get_vbus_status(musb);
        spin_unlock_irqrestore(&musb->lock, flags);

        return sprintf(buf, "Vbus %s, timeout %lu msec\n",
                        vbus ? "on" : "off", val);
}
static DEVICE_ATTR(vbus, 0644, musb_vbus_show, musb_vbus_store);

/* Gadget drivers can't know that a host is connected so they might want
 * to start SRP, but users can.  This allows userspace to trigger SRP.
 */
static ssize_t
musb_srp_store(struct device *dev, struct device_attribute *attr,
                const char *buf, size_t n)
{
        struct musb     *musb = dev_to_musb(dev);
        unsigned short  srp;

        if (sscanf(buf, "%hu", &srp) != 1
                        || (srp != 1)) {
                dev_err(dev, "SRP: Value must be 1\n");
                return -EINVAL;
        }

        if (srp == 1)
                musb_g_wakeup(musb);

        return n;
}
static DEVICE_ATTR(srp, 0644, NULL, musb_srp_store);

static struct attribute *musb_attributes[] = {
        &dev_attr_mode.attr,
        &dev_attr_vbus.attr,
        &dev_attr_srp.attr,
        NULL
};

static const struct attribute_group musb_attr_group = {
        .attrs = musb_attributes,
};

/* Only used to provide driver mode change events */
static void musb_irq_work(struct work_struct *data)
{
        struct musb *musb = container_of(data, struct musb, irq_work);

        if (musb->xceiv->state != musb->xceiv_old_state) {
                musb->xceiv_old_state = musb->xceiv->state;
                sysfs_notify(&musb->controller->kobj, NULL, "mode");
        }
}

/* --------------------------------------------------------------------------
 * Init support
 */

static struct musb *allocate_instance(struct device *dev,
                struct musb_hdrc_config *config, void __iomem *mbase)
{
        struct musb             *musb;
        struct musb_hw_ep       *ep;
        int                     epnum;
        int                     ret;

        musb = devm_kzalloc(dev, sizeof(*musb), GFP_KERNEL);
        if (!musb)
                return NULL;

        INIT_LIST_HEAD(&musb->control);
        INIT_LIST_HEAD(&musb->in_bulk);
        INIT_LIST_HEAD(&musb->out_bulk);

        musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
        musb->a_wait_bcon = OTG_TIME_A_WAIT_BCON;
        musb->mregs = mbase;
        musb->ctrl_base = mbase;
        musb->nIrq = -ENODEV;
        musb->config = config;
        BUG_ON(musb->config->num_eps > MUSB_C_NUM_EPS);
        for (epnum = 0, ep = musb->endpoints;
                        epnum < musb->config->num_eps;
                        epnum++, ep++) {
                ep->musb = musb;
                ep->epnum = epnum;
        }

        musb->controller = dev;

        ret = musb_host_alloc(musb);
        if (ret < 0)
                goto err_free;

        dev_set_drvdata(dev, musb);

        return musb;

err_free:
        return NULL;
}

static void musb_free(struct musb *musb)
{
        /* this has multiple entry modes. it handles fault cleanup after
         * probe(), where things may be partially set up, as well as rmmod
         * cleanup after everything's been de-activated.
         */

#ifdef CONFIG_SYSFS
        sysfs_remove_group(&musb->controller->kobj, &musb_attr_group);
#endif

        if (musb->nIrq >= 0) {
                if (musb->irq_wake)
                        disable_irq_wake(musb->nIrq);
                free_irq(musb->nIrq, musb);
        }

        musb_host_free(musb);
}

static void musb_deassert_reset(struct work_struct *work)
{
        struct musb *musb;
        unsigned long flags;

        musb = container_of(work, struct musb, deassert_reset_work.work);

        spin_lock_irqsave(&musb->lock, flags);

        if (musb->port1_status & USB_PORT_STAT_RESET)
                musb_port_reset(musb, false);

        spin_unlock_irqrestore(&musb->lock, flags);
}

/*
 * Perform generic per-controller initialization.
 *
 * @dev: the controller (already clocked, etc)
 * @nIrq: IRQ number
 * @ctrl: virtual address of controller registers,
 *      not yet corrected for platform-specific offsets
 */
static int
musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
{
        int                     status;
        struct musb             *musb;
        struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);

        /* The driver might handle more features than the board; OK.
         * Fail when the board needs a feature that's not enabled.
         */
        if (!plat) {
                dev_dbg(dev, "no platform_data?\n");
                status = -ENODEV;
                goto fail0;
        }

        /* allocate */
        musb = allocate_instance(dev, plat->config, ctrl);
        if (!musb) {
                status = -ENOMEM;
                goto fail0;
        }

        pm_runtime_use_autosuspend(musb->controller);
        pm_runtime_set_autosuspend_delay(musb->controller, 200);
        pm_runtime_enable(musb->controller);

        spin_lock_init(&musb->lock);
        musb->board_set_power = plat->set_power;
        musb->min_power = plat->min_power;
        musb->ops = plat->platform_ops;
        musb->port_mode = plat->mode;

        /* The musb_platform_init() call:
         *   - adjusts musb->mregs
         *   - sets the musb->isr
         *   - may initialize an integrated transceiver
         *   - initializes musb->xceiv, usually by otg_get_phy()
         *   - stops powering VBUS
         *
         * There are various transceiver configurations.  Blackfin,
         * DaVinci, TUSB60x0, and others integrate them.  OMAP3 uses
         * external/discrete ones in various flavors (twl4030 family,
         * isp1504, non-OTG, etc) mostly hooking up through ULPI.
         */
        status = musb_platform_init(musb);
        if (status < 0)
                goto fail1;

        if (!musb->isr) {
                status = -ENODEV;
                goto fail2;
        }

        if (!musb->xceiv->io_ops) {
                musb->xceiv->io_dev = musb->controller;
                musb->xceiv->io_priv = musb->mregs;
                musb->xceiv->io_ops = &musb_ulpi_access;
        }

        pm_runtime_get_sync(musb->controller);

        if (use_dma && dev->dma_mask) {
                musb->dma_controller = dma_controller_create(musb, musb->mregs);
                if (IS_ERR(musb->dma_controller)) {
                        status = PTR_ERR(musb->dma_controller);
                        goto fail2_5;
                }
        }

        /* be sure interrupts are disabled before connecting ISR */
        musb_platform_disable(musb);
        musb_generic_disable(musb);

        /* Init IRQ workqueue before request_irq */
        INIT_WORK(&musb->irq_work, musb_irq_work);
        INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset);
        INIT_DELAYED_WORK(&musb->finish_resume_work, musb_host_finish_resume);

        /* setup musb parts of the core (especially endpoints) */
        status = musb_core_init(plat->config->multipoint
                        ? MUSB_CONTROLLER_MHDRC
                        : MUSB_CONTROLLER_HDRC, musb);
        if (status < 0)
                goto fail3;

        setup_timer(&musb->otg_timer, musb_otg_timer_func, (unsigned long) musb);

        /* attach to the IRQ */
        if (request_irq(nIrq, musb->isr, 0, dev_name(dev), musb)) {
                dev_err(dev, "request_irq %d failed!\n", nIrq);
                status = -ENODEV;
                goto fail3;
        }
        musb->nIrq = nIrq;
        /* FIXME this handles wakeup irqs wrong */
        if (enable_irq_wake(nIrq) == 0) {
                musb->irq_wake = 1;
                device_init_wakeup(dev, 1);
        } else {
                musb->irq_wake = 0;
        }

        /* program PHY to use external vBus if required */
        if (plat->extvbus) {
                u8 busctl = musb_read_ulpi_buscontrol(musb->mregs);
                busctl |= MUSB_ULPI_USE_EXTVBUS;
                musb_write_ulpi_buscontrol(musb->mregs, busctl);
        }

        if (musb->xceiv->otg->default_a) {
                MUSB_HST_MODE(musb);
                musb->xceiv->state = OTG_STATE_A_IDLE;
        } else {
                MUSB_DEV_MODE(musb);
                musb->xceiv->state = OTG_STATE_B_IDLE;
        }

        switch (musb->port_mode) {
        case MUSB_PORT_MODE_HOST:
                status = musb_host_setup(musb, plat->power);
                if (status < 0)
                        goto fail3;
                status = musb_platform_set_mode(musb, MUSB_HOST);
                break;
        case MUSB_PORT_MODE_GADGET:
                status = musb_gadget_setup(musb);
                if (status < 0)
                        goto fail3;
                status = musb_platform_set_mode(musb, MUSB_PERIPHERAL);
                break;
        case MUSB_PORT_MODE_DUAL_ROLE:
                status = musb_host_setup(musb, plat->power);
                if (status < 0)
                        goto fail3;
                status = musb_gadget_setup(musb);
                if (status) {
                        musb_host_cleanup(musb);
                        goto fail3;
                }
                status = musb_platform_set_mode(musb, MUSB_OTG);
                break;
        default:
                dev_err(dev, "unsupported port mode %d\n", musb->port_mode);
                break;
        }

        if (status < 0)
                goto fail3;

        status = musb_init_debugfs(musb);
        if (status < 0)
                goto fail4;

        status = sysfs_create_group(&musb->controller->kobj, &musb_attr_group);
        if (status)
                goto fail5;

        pm_runtime_put(musb->controller);

        return 0;

fail5:
        musb_exit_debugfs(musb);

fail4:
        musb_gadget_cleanup(musb);
        musb_host_cleanup(musb);

fail3:
        cancel_work_sync(&musb->irq_work);
        cancel_delayed_work_sync(&musb->finish_resume_work);
        cancel_delayed_work_sync(&musb->deassert_reset_work);
        if (musb->dma_controller)
                dma_controller_destroy(musb->dma_controller);
fail2_5:
        pm_runtime_put_sync(musb->controller);

fail2:
        if (musb->irq_wake)
                device_init_wakeup(dev, 0);
        musb_platform_exit(musb);

fail1:
        pm_runtime_disable(musb->controller);
        dev_err(musb->controller,
                "musb_init_controller failed with status %d\n", status);

        musb_free(musb);

fail0:

        return status;

}

/*-------------------------------------------------------------------------*/

/* all implementations (PCI bridge to FPGA, VLYNQ, etc) should just
 * bridge to a platform device; this driver then suffices.
 */
static int musb_probe(struct platform_device *pdev)
{
        struct device   *dev = &pdev->dev;
        int             irq = platform_get_irq_byname(pdev, "mc");
        struct resource *iomem;
        void __iomem    *base;

        iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!iomem || irq <= 0)
                return -ENODEV;

        base = devm_ioremap_resource(dev, iomem);
        if (IS_ERR(base))
                return PTR_ERR(base);

        return musb_init_controller(dev, irq, base);
}

static int musb_remove(struct platform_device *pdev)
{
        struct device   *dev = &pdev->dev;
        struct musb     *musb = dev_to_musb(dev);

        /* this gets called on rmmod.
         *  - Host mode: host may still be active
         *  - Peripheral mode: peripheral is deactivated (or never-activated)
         *  - OTG mode: both roles are deactivated (or never-activated)
         */
        musb_exit_debugfs(musb);
        musb_shutdown(pdev);

        if (musb->dma_controller)
                dma_controller_destroy(musb->dma_controller);

        cancel_work_sync(&musb->irq_work);
        cancel_delayed_work_sync(&musb->finish_resume_work);
        cancel_delayed_work_sync(&musb->deassert_reset_work);
        musb_free(musb);
        device_init_wakeup(dev, 0);
        return 0;
}

#ifdef  CONFIG_PM

static void musb_save_context(struct musb *musb)
{
        int i;
        void __iomem *musb_base = musb->mregs;
        void __iomem *epio;

        musb->context.frame = musb_readw(musb_base, MUSB_FRAME);
        musb->context.testmode = musb_readb(musb_base, MUSB_TESTMODE);
        musb->context.busctl = musb_read_ulpi_buscontrol(musb->mregs);
        musb->context.power = musb_readb(musb_base, MUSB_POWER);
        musb->context.intrusbe = musb_readb(musb_base, MUSB_INTRUSBE);
        musb->context.index = musb_readb(musb_base, MUSB_INDEX);
        musb->context.devctl = musb_readb(musb_base, MUSB_DEVCTL);

        for (i = 0; i < musb->config->num_eps; ++i) {
                struct musb_hw_ep       *hw_ep;

                hw_ep = &musb->endpoints[i];
                if (!hw_ep)
                        continue;

                epio = hw_ep->regs;
                if (!epio)
                        continue;

                musb_writeb(musb_base, MUSB_INDEX, i);
                musb->context.index_regs[i].txmaxp =
                        musb_readw(epio, MUSB_TXMAXP);
                musb->context.index_regs[i].txcsr =
                        musb_readw(epio, MUSB_TXCSR);
                musb->context.index_regs[i].rxmaxp =
                        musb_readw(epio, MUSB_RXMAXP);
                musb->context.index_regs[i].rxcsr =
                        musb_readw(epio, MUSB_RXCSR);

                if (musb->dyn_fifo) {
                        musb->context.index_regs[i].txfifoadd =
                                        musb_read_txfifoadd(musb_base);
                        musb->context.index_regs[i].rxfifoadd =
                                        musb_read_rxfifoadd(musb_base);
                        musb->context.index_regs[i].txfifosz =
                                        musb_read_txfifosz(musb_base);
                        musb->context.index_regs[i].rxfifosz =
                                        musb_read_rxfifosz(musb_base);
                }

                musb->context.index_regs[i].txtype =
                        musb_readb(epio, MUSB_TXTYPE);
                musb->context.index_regs[i].txinterval =
                        musb_readb(epio, MUSB_TXINTERVAL);
                musb->context.index_regs[i].rxtype =
                        musb_readb(epio, MUSB_RXTYPE);
                musb->context.index_regs[i].rxinterval =
                        musb_readb(epio, MUSB_RXINTERVAL);

                musb->context.index_regs[i].txfunaddr =
                        musb_read_txfunaddr(musb_base, i);
                musb->context.index_regs[i].txhubaddr =
                        musb_read_txhubaddr(musb_base, i);
                musb->context.index_regs[i].txhubport =
                        musb_read_txhubport(musb_base, i);

                musb->context.index_regs[i].rxfunaddr =
                        musb_read_rxfunaddr(musb_base, i);
                musb->context.index_regs[i].rxhubaddr =
                        musb_read_rxhubaddr(musb_base, i);
                musb->context.index_regs[i].rxhubport =
                        musb_read_rxhubport(musb_base, i);
        }
}

static void musb_restore_context(struct musb *musb)
{
        int i;
        void __iomem *musb_base = musb->mregs;
        void __iomem *ep_target_regs;
        void __iomem *epio;

        musb_writew(musb_base, MUSB_FRAME, musb->context.frame);
        musb_writeb(musb_base, MUSB_TESTMODE, musb->context.testmode);
        musb_write_ulpi_buscontrol(musb->mregs, musb->context.busctl);
        musb_writeb(musb_base, MUSB_POWER, musb->context.power);
        musb_writew(musb_base, MUSB_INTRTXE, musb->intrtxe);
        musb_writew(musb_base, MUSB_INTRRXE, musb->intrrxe);
        musb_writeb(musb_base, MUSB_INTRUSBE, musb->context.intrusbe);
        musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl);

        for (i = 0; i < musb->config->num_eps; ++i) {
                struct musb_hw_ep       *hw_ep;

                hw_ep = &musb->endpoints[i];
                if (!hw_ep)
                        continue;

                epio = hw_ep->regs;
                if (!epio)
                        continue;

                musb_writeb(musb_base, MUSB_INDEX, i);
                musb_writew(epio, MUSB_TXMAXP,
                        musb->context.index_regs[i].txmaxp);
                musb_writew(epio, MUSB_TXCSR,
                        musb->context.index_regs[i].txcsr);
                musb_writew(epio, MUSB_RXMAXP,
                        musb->context.index_regs[i].rxmaxp);
                musb_writew(epio, MUSB_RXCSR,
                        musb->context.index_regs[i].rxcsr);

                if (musb->dyn_fifo) {
                        musb_write_txfifosz(musb_base,
                                musb->context.index_regs[i].txfifosz);
                        musb_write_rxfifosz(musb_base,
                                musb->context.index_regs[i].rxfifosz);
                        musb_write_txfifoadd(musb_base,
                                musb->context.index_regs[i].txfifoadd);
                        musb_write_rxfifoadd(musb_base,
                                musb->context.index_regs[i].rxfifoadd);
                }

                musb_writeb(epio, MUSB_TXTYPE,
                                musb->context.index_regs[i].txtype);
                musb_writeb(epio, MUSB_TXINTERVAL,
                                musb->context.index_regs[i].txinterval);
                musb_writeb(epio, MUSB_RXTYPE,
                                musb->context.index_regs[i].rxtype);
                musb_writeb(epio, MUSB_RXINTERVAL,

                                musb->context.index_regs[i].rxinterval);
                musb_write_txfunaddr(musb_base, i,
                                musb->context.index_regs[i].txfunaddr);
                musb_write_txhubaddr(musb_base, i,
                                musb->context.index_regs[i].txhubaddr);
                musb_write_txhubport(musb_base, i,
                                musb->context.index_regs[i].txhubport);

                ep_target_regs =
                        musb_read_target_reg_base(i, musb_base);

                musb_write_rxfunaddr(ep_target_regs,
                                musb->context.index_regs[i].rxfunaddr);
                musb_write_rxhubaddr(ep_target_regs,
                                musb->context.index_regs[i].rxhubaddr);
                musb_write_rxhubport(ep_target_regs,
                                musb->context.index_regs[i].rxhubport);
        }
        musb_writeb(musb_base, MUSB_INDEX, musb->context.index);
}

static int musb_suspend(struct device *dev)
{
        struct musb     *musb = dev_to_musb(dev);
        unsigned long   flags;

        spin_lock_irqsave(&musb->lock, flags);

        if (is_peripheral_active(musb)) {
                /* FIXME force disconnect unless we know USB will wake
                 * the system up quickly enough to respond ...
                 */
        } else if (is_host_active(musb)) {
                /* we know all the children are suspended; sometimes
                 * they will even be wakeup-enabled.
                 */
        }

        musb_save_context(musb);

        spin_unlock_irqrestore(&musb->lock, flags);
        return 0;
}

static int musb_resume_noirq(struct device *dev)
{
        struct musb     *musb = dev_to_musb(dev);

        /*
         * For static cmos like DaVinci, register values were preserved
         * unless for some reason the whole soc powered down or the USB
         * module got reset through the PSC (vs just being disabled).
         *
         * For the DSPS glue layer though, a full register restore has to
         * be done. As it shouldn't harm other platforms, we do it
         * unconditionally.
         */

        musb_restore_context(musb);

        return 0;
}

static int musb_runtime_suspend(struct device *dev)
{
        struct musb     *musb = dev_to_musb(dev);

        musb_save_context(musb);

        return 0;
}

static int musb_runtime_resume(struct device *dev)
{
        struct musb     *musb = dev_to_musb(dev);
        static int      first = 1;

        /*
         * When pm_runtime_get_sync called for the first time in driver
         * init,  some of the structure is still not initialized which is
         * used in restore function. But clock needs to be
         * enabled before any register access, so
         * pm_runtime_get_sync has to be called.
         * Also context restore without save does not make
         * any sense
         */
        if (!first)
                musb_restore_context(musb);
        first = 0;

        return 0;
}

static const struct dev_pm_ops musb_dev_pm_ops = {
        .suspend        = musb_suspend,
        .resume_noirq   = musb_resume_noirq,
        .runtime_suspend = musb_runtime_suspend,
        .runtime_resume = musb_runtime_resume,
};

#define MUSB_DEV_PM_OPS (&musb_dev_pm_ops)
#else
#define MUSB_DEV_PM_OPS NULL
#endif

static struct platform_driver musb_driver = {
        .driver = {
                .name           = (char *)musb_driver_name,
                .bus            = &platform_bus_type,
                .owner          = THIS_MODULE,
                .pm             = MUSB_DEV_PM_OPS,
        },
        .probe          = musb_probe,
        .remove         = musb_remove,
        .shutdown       = musb_shutdown,
};

module_platform_driver(musb_driver);