/*
 * Mentor USB OTG Core host controller driver.
 *
 * Copyright (c) 2008 Texas Instruments
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 * Author: Thomas Abraham t-abraham@ti.com, Texas Instruments
 */

#include <common.h>
#include <usb.h>
#include "musb_hcd.h"

/* MSC control transfers */
#define USB_MSC_BBB_RESET       0xFF
#define USB_MSC_BBB_GET_MAX_LUN 0xFE

/* Endpoint configuration information */
static const struct musb_epinfo epinfo[3] = {
        {MUSB_BULK_EP, 1, 512}, /* EP1 - Bluk Out - 512 Bytes */
        {MUSB_BULK_EP, 0, 512}, /* EP1 - Bluk In  - 512 Bytes */
        {MUSB_INTR_EP, 0, 64}   /* EP2 - Interrupt IN - 64 Bytes */
};

/* --- Virtual Root Hub ---------------------------------------------------- */
#ifdef MUSB_NO_MULTIPOINT
static int rh_devnum;
static u32 port_status;

/* Device descriptor */
static const u8 root_hub_dev_des[] = {
        0x12,                   /*  __u8  bLength; */
        0x01,                   /*  __u8  bDescriptorType; Device */
        0x00,                   /*  __u16 bcdUSB; v1.1 */
        0x02,
        0x09,                   /*  __u8  bDeviceClass; HUB_CLASSCODE */
        0x00,                   /*  __u8  bDeviceSubClass; */
        0x00,                   /*  __u8  bDeviceProtocol; */
        0x08,                   /*  __u8  bMaxPacketSize0; 8 Bytes */
        0x00,                   /*  __u16 idVendor; */
        0x00,
        0x00,                   /*  __u16 idProduct; */
        0x00,
        0x00,                   /*  __u16 bcdDevice; */
        0x00,
        0x00,                   /*  __u8  iManufacturer; */
        0x01,                   /*  __u8  iProduct; */
        0x00,                   /*  __u8  iSerialNumber; */
        0x01                    /*  __u8  bNumConfigurations; */
};

/* Configuration descriptor */
static const u8 root_hub_config_des[] = {
        0x09,                   /*  __u8  bLength; */
        0x02,                   /*  __u8  bDescriptorType; Configuration */
        0x19,                   /*  __u16 wTotalLength; */
        0x00,
        0x01,                   /*  __u8  bNumInterfaces; */
        0x01,                   /*  __u8  bConfigurationValue; */
        0x00,                   /*  __u8  iConfiguration; */
        0x40,                   /*  __u8  bmAttributes;
                                   Bit 7: Bus-powered, 6: Self-powered, 5 Remote-wakwup, 4..0: resvd */
        0x00,                   /*  __u8  MaxPower; */

        /* interface */
        0x09,                   /*  __u8  if_bLength; */
        0x04,                   /*  __u8  if_bDescriptorType; Interface */
        0x00,                   /*  __u8  if_bInterfaceNumber; */
        0x00,                   /*  __u8  if_bAlternateSetting; */
        0x01,                   /*  __u8  if_bNumEndpoints; */
        0x09,                   /*  __u8  if_bInterfaceClass; HUB_CLASSCODE */
        0x00,                   /*  __u8  if_bInterfaceSubClass; */
        0x00,                   /*  __u8  if_bInterfaceProtocol; */
        0x00,                   /*  __u8  if_iInterface; */

        /* endpoint */
        0x07,                   /*  __u8  ep_bLength; */
        0x05,                   /*  __u8  ep_bDescriptorType; Endpoint */
        0x81,                   /*  __u8  ep_bEndpointAddress; IN Endpoint 1 */
        0x03,                   /*  __u8  ep_bmAttributes; Interrupt */
        0x00,                   /*  __u16 ep_wMaxPacketSize; ((MAX_ROOT_PORTS + 1) / 8 */
        0x02,
        0xff                    /*  __u8  ep_bInterval; 255 ms */
};

static const unsigned char root_hub_str_index0[] = {
        0x04,                   /*  __u8  bLength; */
        0x03,                   /*  __u8  bDescriptorType; String-descriptor */
        0x09,                   /*  __u8  lang ID */
        0x04,                   /*  __u8  lang ID */
};

static const unsigned char root_hub_str_index1[] = {
        0x1c,                   /*  __u8  bLength; */
        0x03,                   /*  __u8  bDescriptorType; String-descriptor */
        'M',                    /*  __u8  Unicode */
        0,                      /*  __u8  Unicode */
        'U',                    /*  __u8  Unicode */
        0,                      /*  __u8  Unicode */
        'S',                    /*  __u8  Unicode */
        0,                      /*  __u8  Unicode */
        'B',                    /*  __u8  Unicode */
        0,                      /*  __u8  Unicode */
        ' ',                    /*  __u8  Unicode */
        0,                      /*  __u8  Unicode */
        'R',                    /*  __u8  Unicode */
        0,                      /*  __u8  Unicode */
        'o',                    /*  __u8  Unicode */
        0,                      /*  __u8  Unicode */
        'o',                    /*  __u8  Unicode */
        0,                      /*  __u8  Unicode */
        't',                    /*  __u8  Unicode */
        0,                      /*  __u8  Unicode */
        ' ',                    /*  __u8  Unicode */
        0,                      /*  __u8  Unicode */
        'H',                    /*  __u8  Unicode */
        0,                      /*  __u8  Unicode */
        'u',                    /*  __u8  Unicode */
        0,                      /*  __u8  Unicode */
        'b',                    /*  __u8  Unicode */
        0,                      /*  __u8  Unicode */
};
#endif

/*
 * This function writes the data toggle value.
 */
static void write_toggle(struct usb_device *dev, u8 ep, u8 dir_out)
{
        u16 toggle = usb_gettoggle(dev, ep, dir_out);
        u16 csr;

        if (dir_out) {
                csr = readw(&musbr->txcsr);
                if (!toggle) {
                        if (csr & MUSB_TXCSR_MODE)
                                csr = MUSB_TXCSR_CLRDATATOG;
                        else
                                csr = 0;
                        writew(csr, &musbr->txcsr);
                } else {
                        csr |= MUSB_TXCSR_H_WR_DATATOGGLE;
                        writew(csr, &musbr->txcsr);
                        csr |= (toggle << MUSB_TXCSR_H_DATATOGGLE_SHIFT);
                        writew(csr, &musbr->txcsr);
                }
        } else {
                if (!toggle) {
                        csr = readw(&musbr->txcsr);
                        if (csr & MUSB_TXCSR_MODE)
                                csr = MUSB_RXCSR_CLRDATATOG;
                        else
                                csr = 0;
                        writew(csr, &musbr->rxcsr);
                } else {
                        csr = readw(&musbr->rxcsr);
                        csr |= MUSB_RXCSR_H_WR_DATATOGGLE;
                        writew(csr, &musbr->rxcsr);
                        csr |= (toggle << MUSB_S_RXCSR_H_DATATOGGLE);
                        writew(csr, &musbr->rxcsr);
                }
        }
}

/*
 * This function checks if RxStall has occured on the endpoint. If a RxStall
 * has occured, the RxStall is cleared and 1 is returned. If RxStall has
 * not occured, 0 is returned.
 */
static u8 check_stall(u8 ep, u8 dir_out)
{
        u16 csr;

        /* For endpoint 0 */
        if (!ep) {
                csr = readw(&musbr->txcsr);
                if (csr & MUSB_CSR0_H_RXSTALL) {
                        csr &= ~MUSB_CSR0_H_RXSTALL;
                        writew(csr, &musbr->txcsr);
                        return 1;
                }
        } else { /* For non-ep0 */
                if (dir_out) { /* is it tx ep */
                        csr = readw(&musbr->txcsr);
                        if (csr & MUSB_TXCSR_H_RXSTALL) {
                                csr &= ~MUSB_TXCSR_H_RXSTALL;
                                writew(csr, &musbr->txcsr);
                                return 1;
                        }
                } else { /* is it rx ep */
                        csr = readw(&musbr->rxcsr);
                        if (csr & MUSB_RXCSR_H_RXSTALL) {
                                csr &= ~MUSB_RXCSR_H_RXSTALL;
                                writew(csr, &musbr->rxcsr);
                                return 1;
                        }
                }
        }
        return 0;
}

/*
 * waits until ep0 is ready. Returns 0 if ep is ready, -1 for timeout
 * error and -2 for stall.
 */
static int wait_until_ep0_ready(struct usb_device *dev, u32 bit_mask)
{
        u16 csr;
        int result = 1;
        int timeout = CONFIG_MUSB_TIMEOUT;

        while (result > 0) {
                csr = readw(&musbr->txcsr);
                if (csr & MUSB_CSR0_H_ERROR) {
                        csr &= ~MUSB_CSR0_H_ERROR;
                        writew(csr, &musbr->txcsr);
                        dev->status = USB_ST_CRC_ERR;
                        result = -1;
                        break;
                }

                switch (bit_mask) {
                case MUSB_CSR0_TXPKTRDY:
                        if (!(csr & MUSB_CSR0_TXPKTRDY)) {
                                if (check_stall(MUSB_CONTROL_EP, 0)) {
                                        dev->status = USB_ST_STALLED;
                                        result = -2;
                                } else
                                        result = 0;
                        }
                        break;

                case MUSB_CSR0_RXPKTRDY:
                        if (check_stall(MUSB_CONTROL_EP, 0)) {
                                dev->status = USB_ST_STALLED;
                                result = -2;
                        } else
                                if (csr & MUSB_CSR0_RXPKTRDY)
                                        result = 0;
                        break;

                case MUSB_CSR0_H_REQPKT:
                        if (!(csr & MUSB_CSR0_H_REQPKT)) {
                                if (check_stall(MUSB_CONTROL_EP, 0)) {
                                        dev->status = USB_ST_STALLED;
                                        result = -2;
                                } else
                                        result = 0;
                        }
                        break;
                }

                /* Check the timeout */
                if (--timeout)
                        udelay(1);
                else {
                        dev->status = USB_ST_CRC_ERR;
                        result = -1;
                        break;
                }
        }

        return result;
}

/*
 * waits until tx ep is ready. Returns 1 when ep is ready and 0 on error.
 */
static u8 wait_until_txep_ready(struct usb_device *dev, u8 ep)
{
        u16 csr;
        int timeout = CONFIG_MUSB_TIMEOUT;

        do {
                if (check_stall(ep, 1)) {
                        dev->status = USB_ST_STALLED;
                        return 0;
                }

                csr = readw(&musbr->txcsr);
                if (csr & MUSB_TXCSR_H_ERROR) {
                        dev->status = USB_ST_CRC_ERR;
                        return 0;
                }

                /* Check the timeout */
                if (--timeout)
                        udelay(1);
                else {
                        dev->status = USB_ST_CRC_ERR;
                        return -1;
                }

        } while (csr & MUSB_TXCSR_TXPKTRDY);
        return 1;
}

/*
 * waits until rx ep is ready. Returns 1 when ep is ready and 0 on error.
 */
static u8 wait_until_rxep_ready(struct usb_device *dev, u8 ep)
{
        u16 csr;
        int timeout = CONFIG_MUSB_TIMEOUT;

        do {
                if (check_stall(ep, 0)) {
                        dev->status = USB_ST_STALLED;
                        return 0;
                }

                csr = readw(&musbr->rxcsr);
                if (csr & MUSB_RXCSR_H_ERROR) {
                        dev->status = USB_ST_CRC_ERR;
                        return 0;
                }

                /* Check the timeout */
                if (--timeout)
                        udelay(1);
                else {
                        dev->status = USB_ST_CRC_ERR;
                        return -1;
                }

        } while (!(csr & MUSB_RXCSR_RXPKTRDY));
        return 1;
}

/*
 * This function performs the setup phase of the control transfer
 */
static int ctrlreq_setup_phase(struct usb_device *dev, struct devrequest *setup)
{
        int result;
        u16 csr;

        /* write the control request to ep0 fifo */
        write_fifo(MUSB_CONTROL_EP, sizeof(struct devrequest), (void *)setup);

        /* enable transfer of setup packet */
        csr = readw(&musbr->txcsr);
        csr |= (MUSB_CSR0_TXPKTRDY|MUSB_CSR0_H_SETUPPKT);
        writew(csr, &musbr->txcsr);

        /* wait until the setup packet is transmitted */
        result = wait_until_ep0_ready(dev, MUSB_CSR0_TXPKTRDY);
        dev->act_len = 0;
        return result;
}

/*
 * This function handles the control transfer in data phase
 */
static int ctrlreq_in_data_phase(struct usb_device *dev, u32 len, void *buffer)
{
        u16 csr;
        u32 rxlen = 0;
        u32 nextlen = 0;
        u8  maxpktsize = (1 << dev->maxpacketsize) * 8;
        u8  *rxbuff = (u8 *)buffer;
        u8  rxedlength;
        int result;

        while (rxlen < len) {
                /* Determine the next read length */
                nextlen = ((len-rxlen) > maxpktsize) ? maxpktsize : (len-rxlen);

                /* Set the ReqPkt bit */
                csr = readw(&musbr->txcsr);
                writew(csr | MUSB_CSR0_H_REQPKT, &musbr->txcsr);
                result = wait_until_ep0_ready(dev, MUSB_CSR0_RXPKTRDY);
                if (result < 0)
                        return result;

                /* Actual number of bytes received by usb */
                rxedlength = readb(&musbr->rxcount);

                /* Read the data from the RxFIFO */
                read_fifo(MUSB_CONTROL_EP, rxedlength, &rxbuff[rxlen]);

                /* Clear the RxPktRdy Bit */
                csr = readw(&musbr->txcsr);
                csr &= ~MUSB_CSR0_RXPKTRDY;
                writew(csr, &musbr->txcsr);

                /* short packet? */
                if (rxedlength != nextlen) {
                        dev->act_len += rxedlength;
                        break;
                }
                rxlen += nextlen;
                dev->act_len = rxlen;
        }
        return 0;
}

/*
 * This function handles the control transfer out data phase
 */
static int ctrlreq_out_data_phase(struct usb_device *dev, u32 len, void *buffer)
{
        u16 csr;
        u32 txlen = 0;
        u32 nextlen = 0;
        u8  maxpktsize = (1 << dev->maxpacketsize) * 8;
        u8  *txbuff = (u8 *)buffer;
        int result = 0;

        while (txlen < len) {
                /* Determine the next write length */
                nextlen = ((len-txlen) > maxpktsize) ? maxpktsize : (len-txlen);

                /* Load the data to send in FIFO */
                write_fifo(MUSB_CONTROL_EP, txlen, &txbuff[txlen]);

                /* Set TXPKTRDY bit */
                csr = readw(&musbr->txcsr);
                writew(csr | MUSB_CSR0_H_DIS_PING | MUSB_CSR0_TXPKTRDY,
                                        &musbr->txcsr);
                result = wait_until_ep0_ready(dev, MUSB_CSR0_TXPKTRDY);
                if (result < 0)
                        break;

                txlen += nextlen;
                dev->act_len = txlen;
        }
        return result;
}

/*
 * This function handles the control transfer out status phase
 */
static int ctrlreq_out_status_phase(struct usb_device *dev)
{
        u16 csr;
        int result;

        /* Set the StatusPkt bit */
        csr = readw(&musbr->txcsr);
        csr |= (MUSB_CSR0_H_DIS_PING | MUSB_CSR0_TXPKTRDY |
                        MUSB_CSR0_H_STATUSPKT);
        writew(csr, &musbr->txcsr);

        /* Wait until TXPKTRDY bit is cleared */
        result = wait_until_ep0_ready(dev, MUSB_CSR0_TXPKTRDY);
        return result;
}

/*
 * This function handles the control transfer in status phase
 */
static int ctrlreq_in_status_phase(struct usb_device *dev)
{
        u16 csr;
        int result;

        /* Set the StatusPkt bit and ReqPkt bit */
        csr = MUSB_CSR0_H_DIS_PING | MUSB_CSR0_H_REQPKT | MUSB_CSR0_H_STATUSPKT;
        writew(csr, &musbr->txcsr);
        result = wait_until_ep0_ready(dev, MUSB_CSR0_H_REQPKT);

        /* clear StatusPkt bit and RxPktRdy bit */
        csr = readw(&musbr->txcsr);
        csr &= ~(MUSB_CSR0_RXPKTRDY | MUSB_CSR0_H_STATUSPKT);
        writew(csr, &musbr->txcsr);
        return result;
}

/*
 * determines the speed of the device (High/Full/Slow)
 */
static u8 get_dev_speed(struct usb_device *dev)
{
        return (dev->speed == USB_SPEED_HIGH) ? MUSB_TYPE_SPEED_HIGH :
                ((dev->speed == USB_SPEED_LOW) ? MUSB_TYPE_SPEED_LOW :
                                                MUSB_TYPE_SPEED_FULL);
}

/*
 * configure the hub address and the port address.
 */
static void config_hub_port(struct usb_device *dev, u8 ep)
{
        u8 chid;
        u8 hub;

        /* Find out the nearest parent which is high speed */
        while (dev->parent->parent != NULL)
                if (get_dev_speed(dev->parent) !=  MUSB_TYPE_SPEED_HIGH)
                        dev = dev->parent;
                else
                        break;

        /* determine the port address at that hub */
        hub = dev->parent->devnum;
        for (chid = 0; chid < USB_MAXCHILDREN; chid++)
                if (dev->parent->children[chid] == dev)
                        break;

#ifndef MUSB_NO_MULTIPOINT
        /* configure the hub address and the port address */
        writeb(hub, &musbr->tar[ep].txhubaddr);
        writeb((chid + 1), &musbr->tar[ep].txhubport);
        writeb(hub, &musbr->tar[ep].rxhubaddr);
        writeb((chid + 1), &musbr->tar[ep].rxhubport);
#endif
}

#ifdef MUSB_NO_MULTIPOINT

static void musb_port_reset(int do_reset)
{
        u8 power = readb(&musbr->power);

        if (do_reset) {
                power &= 0xf0;
                writeb(power | MUSB_POWER_RESET, &musbr->power);
                port_status |= USB_PORT_STAT_RESET;
                port_status &= ~USB_PORT_STAT_ENABLE;
                udelay(30000);
        } else {
                writeb(power & ~MUSB_POWER_RESET, &musbr->power);

                power = readb(&musbr->power);
                if (power & MUSB_POWER_HSMODE)
                        port_status |= USB_PORT_STAT_HIGH_SPEED;

                port_status &= ~(USB_PORT_STAT_RESET | (USB_PORT_STAT_C_CONNECTION << 16));
                port_status |= USB_PORT_STAT_ENABLE
                        | (USB_PORT_STAT_C_RESET << 16)
                        | (USB_PORT_STAT_C_ENABLE << 16);
        }
}

/*
 * root hub control
 */
static int musb_submit_rh_msg(struct usb_device *dev, unsigned long pipe,
                              void *buffer, int transfer_len,
                              struct devrequest *cmd)
{
        int leni = transfer_len;
        int len = 0;
        int stat = 0;
        u32 datab[4];
        const u8 *data_buf = (u8 *) datab;
        u16 bmRType_bReq;
        u16 wValue;
        u16 wIndex;
        u16 wLength;
        u16 int_usb;

        if ((pipe & PIPE_INTERRUPT) == PIPE_INTERRUPT) {
                debug("Root-Hub submit IRQ: NOT implemented\n");
                return 0;
        }

        bmRType_bReq = cmd->requesttype | (cmd->request << 8);
        wValue = swap_16(cmd->value);
        wIndex = swap_16(cmd->index);
        wLength = swap_16(cmd->length);

        debug("--- HUB ----------------------------------------\n");
        debug("submit rh urb, req=%x val=%#x index=%#x len=%d\n",
            bmRType_bReq, wValue, wIndex, wLength);
        debug("------------------------------------------------\n");

        switch (bmRType_bReq) {
        case RH_GET_STATUS:
                debug("RH_GET_STATUS\n");

                *(__u16 *) data_buf = swap_16(1);
                len = 2;
                break;

        case RH_GET_STATUS | RH_INTERFACE:
                debug("RH_GET_STATUS | RH_INTERFACE\n");

                *(__u16 *) data_buf = swap_16(0);
                len = 2;
                break;

        case RH_GET_STATUS | RH_ENDPOINT:
                debug("RH_GET_STATUS | RH_ENDPOINT\n");

                *(__u16 *) data_buf = swap_16(0);
                len = 2;
                break;

        case RH_GET_STATUS | RH_CLASS:
                debug("RH_GET_STATUS | RH_CLASS\n");

                *(__u32 *) data_buf = swap_32(0);
                len = 4;
                break;

        case RH_GET_STATUS | RH_OTHER | RH_CLASS:
                debug("RH_GET_STATUS | RH_OTHER | RH_CLASS\n");

                int_usb = readw(&musbr->intrusb);
                if (int_usb & MUSB_INTR_CONNECT) {
                        port_status |= USB_PORT_STAT_CONNECTION
                                | (USB_PORT_STAT_C_CONNECTION << 16);
                        port_status |= USB_PORT_STAT_HIGH_SPEED
                                | USB_PORT_STAT_ENABLE;
                }

                if (port_status & USB_PORT_STAT_RESET)
                        musb_port_reset(0);

                *(__u32 *) data_buf = swap_32(port_status);
                len = 4;
                break;

        case RH_CLEAR_FEATURE | RH_ENDPOINT:
                debug("RH_CLEAR_FEATURE | RH_ENDPOINT\n");

                switch (wValue) {
                case RH_ENDPOINT_STALL:
                        debug("C_HUB_ENDPOINT_STALL\n");
                        len = 0;
                        break;
                }
                port_status &= ~(1 << wValue);
                break;

        case RH_CLEAR_FEATURE | RH_CLASS:
                debug("RH_CLEAR_FEATURE | RH_CLASS\n");

                switch (wValue) {
                case RH_C_HUB_LOCAL_POWER:
                        debug("C_HUB_LOCAL_POWER\n");
                        len = 0;
                        break;

                case RH_C_HUB_OVER_CURRENT:
                        debug("C_HUB_OVER_CURRENT\n");
                        len = 0;
                        break;
                }
                port_status &= ~(1 << wValue);
                break;

        case RH_CLEAR_FEATURE | RH_OTHER | RH_CLASS:
                debug("RH_CLEAR_FEATURE | RH_OTHER | RH_CLASS\n");

                switch (wValue) {
                case RH_PORT_ENABLE:
                        len = 0;
                        break;

                case RH_PORT_SUSPEND:
                        len = 0;
                        break;

                case RH_PORT_POWER:
                        len = 0;
                        break;

                case RH_C_PORT_CONNECTION:
                        len = 0;
                        break;

                case RH_C_PORT_ENABLE:
                        len = 0;
                        break;

                case RH_C_PORT_SUSPEND:
                        len = 0;
                        break;

                case RH_C_PORT_OVER_CURRENT:
                        len = 0;
                        break;

                case RH_C_PORT_RESET:
                        len = 0;
                        break;

                default:
                        debug("invalid wValue\n");
                        stat = USB_ST_STALLED;
                }

                port_status &= ~(1 << wValue);
                break;

        case RH_SET_FEATURE | RH_OTHER | RH_CLASS:
                debug("RH_SET_FEATURE | RH_OTHER | RH_CLASS\n");

                switch (wValue) {
                case RH_PORT_SUSPEND:
                        len = 0;
                        break;

                case RH_PORT_RESET:
                        musb_port_reset(1);
                        len = 0;
                        break;

                case RH_PORT_POWER:
                        len = 0;
                        break;

                case RH_PORT_ENABLE:
                        len = 0;
                        break;

                default:
                        debug("invalid wValue\n");
                        stat = USB_ST_STALLED;
                }

                port_status |= 1 << wValue;
                break;

        case RH_SET_ADDRESS:
                debug("RH_SET_ADDRESS\n");

                rh_devnum = wValue;
                len = 0;
                break;

        case RH_GET_DESCRIPTOR:
                debug("RH_GET_DESCRIPTOR: %x, %d\n", wValue, wLength);

                switch (wValue) {
                case (USB_DT_DEVICE << 8):      /* device descriptor */
                        len = min_t(unsigned int,
                                    leni, min_t(unsigned int,
                                                sizeof(root_hub_dev_des),
                                                wLength));
                        data_buf = root_hub_dev_des;
                        break;

                case (USB_DT_CONFIG << 8):      /* configuration descriptor */
                        len = min_t(unsigned int,
                                    leni, min_t(unsigned int,
                                                sizeof(root_hub_config_des),
                                                wLength));
                        data_buf = root_hub_config_des;
                        break;

                case ((USB_DT_STRING << 8) | 0x00):     /* string 0 descriptors */
                        len = min_t(unsigned int,
                                    leni, min_t(unsigned int,
                                                sizeof(root_hub_str_index0),
                                                wLength));
                        data_buf = root_hub_str_index0;
                        break;

                case ((USB_DT_STRING << 8) | 0x01):     /* string 1 descriptors */
                        len = min_t(unsigned int,
                                    leni, min_t(unsigned int,
                                                sizeof(root_hub_str_index1),
                                                wLength));
                        data_buf = root_hub_str_index1;
                        break;

                default:
                        debug("invalid wValue\n");
                        stat = USB_ST_STALLED;
                }

                break;

        case RH_GET_DESCRIPTOR | RH_CLASS: {
                u8 *_data_buf = (u8 *) datab;
                debug("RH_GET_DESCRIPTOR | RH_CLASS\n");

                _data_buf[0] = 0x09;    /* min length; */
                _data_buf[1] = 0x29;
                _data_buf[2] = 0x1;     /* 1 port */
                _data_buf[3] = 0x01;    /* per-port power switching */
                _data_buf[3] |= 0x10;   /* no overcurrent reporting */

                /* Corresponds to data_buf[4-7] */
                _data_buf[4] = 0;
                _data_buf[5] = 5;
                _data_buf[6] = 0;
                _data_buf[7] = 0x02;
                _data_buf[8] = 0xff;

                len = min_t(unsigned int, leni,
                            min_t(unsigned int, data_buf[0], wLength));
                break;
        }

        case RH_GET_CONFIGURATION:
                debug("RH_GET_CONFIGURATION\n");

                *(__u8 *) data_buf = 0x01;
                len = 1;
                break;

        case RH_SET_CONFIGURATION:
                debug("RH_SET_CONFIGURATION\n");

                len = 0;
                break;

        default:
                debug("*** *** *** unsupported root hub command *** *** ***\n");
                stat = USB_ST_STALLED;
        }

        len = min_t(int, len, leni);
        if (buffer != data_buf)
                memcpy(buffer, data_buf, len);

        dev->act_len = len;
        dev->status = stat;
        debug("dev act_len %d, status %lu\n", dev->act_len, dev->status);

        return stat;
}

static void musb_rh_init(void)
{
        rh_devnum = 0;
        port_status = 0;
}

#else

static void musb_rh_init(void) {}

#endif

/*
 * do a control transfer
 */
int submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
                        int len, struct devrequest *setup)
{
        int devnum = usb_pipedevice(pipe);
        u8  devspeed;

#ifdef MUSB_NO_MULTIPOINT
        /* Control message is for the HUB? */
        if (devnum == rh_devnum) {
                int stat = musb_submit_rh_msg(dev, pipe, buffer, len, setup);
                if (stat)
                        return stat;
        }
#endif

        /* select control endpoint */
        writeb(MUSB_CONTROL_EP, &musbr->index);
        readw(&musbr->txcsr);

#ifndef MUSB_NO_MULTIPOINT
        /* target addr and (for multipoint) hub addr/port */
        writeb(devnum, &musbr->tar[MUSB_CONTROL_EP].txfuncaddr);
        writeb(devnum, &musbr->tar[MUSB_CONTROL_EP].rxfuncaddr);
#endif

        /* configure the hub address and the port number as required */
        devspeed = get_dev_speed(dev);
        if ((musb_ishighspeed()) && (dev->parent != NULL) &&
                (devspeed != MUSB_TYPE_SPEED_HIGH)) {
                config_hub_port(dev, MUSB_CONTROL_EP);
                writeb(devspeed << 6, &musbr->txtype);
        } else {
                writeb(musb_cfg.musb_speed << 6, &musbr->txtype);
#ifndef MUSB_NO_MULTIPOINT
                writeb(0, &musbr->tar[MUSB_CONTROL_EP].txhubaddr);
                writeb(0, &musbr->tar[MUSB_CONTROL_EP].txhubport);
                writeb(0, &musbr->tar[MUSB_CONTROL_EP].rxhubaddr);
                writeb(0, &musbr->tar[MUSB_CONTROL_EP].rxhubport);
#endif
        }

        /* Control transfer setup phase */
        if (ctrlreq_setup_phase(dev, setup) < 0)
                return 0;

        switch (setup->request) {
        case USB_REQ_GET_DESCRIPTOR:
        case USB_REQ_GET_CONFIGURATION:
        case USB_REQ_GET_INTERFACE:
        case USB_REQ_GET_STATUS:
        case USB_MSC_BBB_GET_MAX_LUN:
                /* control transfer in-data-phase */
                if (ctrlreq_in_data_phase(dev, len, buffer) < 0)
                        return 0;
                /* control transfer out-status-phase */
                if (ctrlreq_out_status_phase(dev) < 0)
                        return 0;
                break;

        case USB_REQ_SET_ADDRESS:
        case USB_REQ_SET_CONFIGURATION:
        case USB_REQ_SET_FEATURE:
        case USB_REQ_SET_INTERFACE:
        case USB_REQ_CLEAR_FEATURE:
        case USB_MSC_BBB_RESET:
                /* control transfer in status phase */
                if (ctrlreq_in_status_phase(dev) < 0)
                        return 0;
                break;

        case USB_REQ_SET_DESCRIPTOR:
                /* control transfer out data phase */
                if (ctrlreq_out_data_phase(dev, len, buffer) < 0)
                        return 0;
                /* control transfer in status phase */
                if (ctrlreq_in_status_phase(dev) < 0)
                        return 0;
                break;

        default:
                /* unhandled control transfer */
                return -1;
        }

        dev->status = 0;
        dev->act_len = len;

#ifdef MUSB_NO_MULTIPOINT
        /* Set device address to USB_FADDR register */
        if (setup->request == USB_REQ_SET_ADDRESS)
                writeb(dev->devnum, &musbr->faddr);
#endif

        return len;
}

/*
 * do a bulk transfer
 */
int submit_bulk_msg(struct usb_device *dev, unsigned long pipe,
                                        void *buffer, int len)
{
        int dir_out = usb_pipeout(pipe);
        int ep = usb_pipeendpoint(pipe);
#ifndef MUSB_NO_MULTIPOINT
        int devnum = usb_pipedevice(pipe);
#endif
        u8  type;
        u16 csr;
        u32 txlen = 0;
        u32 nextlen = 0;
        u8  devspeed;

        /* select bulk endpoint */
        writeb(MUSB_BULK_EP, &musbr->index);

#ifndef MUSB_NO_MULTIPOINT
        /* write the address of the device */
        if (dir_out)
                writeb(devnum, &musbr->tar[MUSB_BULK_EP].txfuncaddr);
        else
                writeb(devnum, &musbr->tar[MUSB_BULK_EP].rxfuncaddr);
#endif

        /* configure the hub address and the port number as required */
        devspeed = get_dev_speed(dev);
        if ((musb_ishighspeed()) && (dev->parent != NULL) &&
                (devspeed != MUSB_TYPE_SPEED_HIGH)) {
                /*
                 * MUSB is in high speed and the destination device is full
                 * speed device. So configure the hub address and port
                 * address registers.
                 */
                config_hub_port(dev, MUSB_BULK_EP);
        } else {
#ifndef MUSB_NO_MULTIPOINT
                if (dir_out) {
                        writeb(0, &musbr->tar[MUSB_BULK_EP].txhubaddr);
                        writeb(0, &musbr->tar[MUSB_BULK_EP].txhubport);
                } else {
                        writeb(0, &musbr->tar[MUSB_BULK_EP].rxhubaddr);
                        writeb(0, &musbr->tar[MUSB_BULK_EP].rxhubport);
                }
#endif
                devspeed = musb_cfg.musb_speed;
        }

        /* Write the saved toggle bit value */
        write_toggle(dev, ep, dir_out);

        if (dir_out) { /* bulk-out transfer */
                /* Program the TxType register */
                type = (devspeed << MUSB_TYPE_SPEED_SHIFT) |

                           (MUSB_TYPE_PROTO_BULK << MUSB_TYPE_PROTO_SHIFT) |
                           (ep & MUSB_TYPE_REMOTE_END);
                writeb(type, &musbr->txtype);

                /* Write maximum packet size to the TxMaxp register */
                writew(dev->epmaxpacketout[ep], &musbr->txmaxp);
                while (txlen < len) {
                        nextlen = ((len-txlen) < dev->epmaxpacketout[ep]) ?
                                        (len-txlen) : dev->epmaxpacketout[ep];

#ifdef CONFIG_USB_BLACKFIN
                        /* Set the transfer data size */
                        writew(nextlen, &musbr->txcount);
#endif

                        /* Write the data to the FIFO */
                        write_fifo(MUSB_BULK_EP, nextlen,
                                        (void *)(((u8 *)buffer) + txlen));

                        /* Set the TxPktRdy bit */
                        csr = readw(&musbr->txcsr);
                        writew(csr | MUSB_TXCSR_TXPKTRDY, &musbr->txcsr);

                        /* Wait until the TxPktRdy bit is cleared */
                        if (!wait_until_txep_ready(dev, MUSB_BULK_EP)) {
                                readw(&musbr->txcsr);
                                usb_settoggle(dev, ep, dir_out,
                                (csr >> MUSB_TXCSR_H_DATATOGGLE_SHIFT) & 1);
                                dev->act_len = txlen;
                                return 0;
                        }
                        txlen += nextlen;
                }

                /* Keep a copy of the data toggle bit */
                csr = readw(&musbr->txcsr);
                usb_settoggle(dev, ep, dir_out,
                                (csr >> MUSB_TXCSR_H_DATATOGGLE_SHIFT) & 1);
        } else { /* bulk-in transfer */
                /* Write the saved toggle bit value */
                write_toggle(dev, ep, dir_out);

                /* Program the RxType register */
                type = (devspeed << MUSB_TYPE_SPEED_SHIFT) |
                           (MUSB_TYPE_PROTO_BULK << MUSB_TYPE_PROTO_SHIFT) |
                           (ep & MUSB_TYPE_REMOTE_END);
                writeb(type, &musbr->rxtype);

                /* Write the maximum packet size to the RxMaxp register */
                writew(dev->epmaxpacketin[ep], &musbr->rxmaxp);
                while (txlen < len) {
                        nextlen = ((len-txlen) < dev->epmaxpacketin[ep]) ?
                                        (len-txlen) : dev->epmaxpacketin[ep];

                        /* Set the ReqPkt bit */
                        csr = readw(&musbr->rxcsr);
                        writew(csr | MUSB_RXCSR_H_REQPKT, &musbr->rxcsr);

                        /* Wait until the RxPktRdy bit is set */
                        if (!wait_until_rxep_ready(dev, MUSB_BULK_EP)) {
                                csr = readw(&musbr->rxcsr);
                                usb_settoggle(dev, ep, dir_out,
                                (csr >> MUSB_S_RXCSR_H_DATATOGGLE) & 1);
                                csr &= ~MUSB_RXCSR_RXPKTRDY;
                                writew(csr, &musbr->rxcsr);
                                dev->act_len = txlen;
                                return 0;
                        }

                        /* Read the data from the FIFO */
                        read_fifo(MUSB_BULK_EP, nextlen,
                                        (void *)(((u8 *)buffer) + txlen));

                        /* Clear the RxPktRdy bit */
                        csr =  readw(&musbr->rxcsr);
                        csr &= ~MUSB_RXCSR_RXPKTRDY;
                        writew(csr, &musbr->rxcsr);
                        txlen += nextlen;
                }

                /* Keep a copy of the data toggle bit */
                csr = readw(&musbr->rxcsr);
                usb_settoggle(dev, ep, dir_out,
                                (csr >> MUSB_S_RXCSR_H_DATATOGGLE) & 1);
        }

        /* bulk transfer is complete */
        dev->status = 0;
        dev->act_len = len;
        return 0;
}

/*
 * This function initializes the usb controller module.
 */
int usb_lowlevel_init(int index, void **controller)
{
        u8  power;
        u32 timeout;

        musb_rh_init();

        if (musb_platform_init() == -1)
                return -1;

        /* Configure all the endpoint FIFO's and start usb controller */
        musbr = musb_cfg.regs;
        musb_configure_ep(&epinfo[0], ARRAY_SIZE(epinfo));
        musb_start();

        /*
         * Wait until musb is enabled in host mode with a timeout. There
         * should be a usb device connected.
         */
        timeout = musb_cfg.timeout;
        while (--timeout)
                if (readb(&musbr->devctl) & MUSB_DEVCTL_HM)
                        break;

        /* if musb core is not in host mode, then return */
        if (!timeout)
                return -1;

        /* start usb bus reset */
        power = readb(&musbr->power);
        writeb(power | MUSB_POWER_RESET, &musbr->power);

        /* After initiating a usb reset, wait for about 20ms to 30ms */
        udelay(30000);

        /* stop usb bus reset */
        power = readb(&musbr->power);
        power &= ~MUSB_POWER_RESET;
        writeb(power, &musbr->power);

        /* Determine if the connected device is a high/full/low speed device */
        musb_cfg.musb_speed = (readb(&musbr->power) & MUSB_POWER_HSMODE) ?
                        MUSB_TYPE_SPEED_HIGH :
                        ((readb(&musbr->devctl) & MUSB_DEVCTL_FSDEV) ?
                        MUSB_TYPE_SPEED_FULL : MUSB_TYPE_SPEED_LOW);
        return 0;
}

/*
 * This function stops the operation of the davinci usb module.
 */
int usb_lowlevel_stop(int index)
{
        /* Reset the USB module */
        musb_platform_deinit();
        writeb(0, &musbr->devctl);
        return 0;
}

/*
 * This function supports usb interrupt transfers. Currently, usb interrupt
 * transfers are not supported.
 */
int submit_int_msg(struct usb_device *dev, unsigned long pipe,
                                void *buffer, int len, int interval)
{
        int dir_out = usb_pipeout(pipe);
        int ep = usb_pipeendpoint(pipe);
#ifndef MUSB_NO_MULTIPOINT
        int devnum = usb_pipedevice(pipe);
#endif
        u8  type;
        u16 csr;
        u32 txlen = 0;
        u32 nextlen = 0;
        u8  devspeed;

        /* select interrupt endpoint */
        writeb(MUSB_INTR_EP, &musbr->index);

#ifndef MUSB_NO_MULTIPOINT
        /* write the address of the device */
        if (dir_out)
                writeb(devnum, &musbr->tar[MUSB_INTR_EP].txfuncaddr);
        else
                writeb(devnum, &musbr->tar[MUSB_INTR_EP].rxfuncaddr);
#endif

        /* configure the hub address and the port number as required */
        devspeed = get_dev_speed(dev);
        if ((musb_ishighspeed()) && (dev->parent != NULL) &&
                (devspeed != MUSB_TYPE_SPEED_HIGH)) {
                /*
                 * MUSB is in high speed and the destination device is full
                 * speed device. So configure the hub address and port
                 * address registers.
                 */
                config_hub_port(dev, MUSB_INTR_EP);
        } else {
#ifndef MUSB_NO_MULTIPOINT
                if (dir_out) {
                        writeb(0, &musbr->tar[MUSB_INTR_EP].txhubaddr);
                        writeb(0, &musbr->tar[MUSB_INTR_EP].txhubport);
                } else {
                        writeb(0, &musbr->tar[MUSB_INTR_EP].rxhubaddr);
                        writeb(0, &musbr->tar[MUSB_INTR_EP].rxhubport);
                }
#endif
                devspeed = musb_cfg.musb_speed;
        }

        /* Write the saved toggle bit value */
        write_toggle(dev, ep, dir_out);

        if (!dir_out) { /* intrrupt-in transfer */
                /* Write the saved toggle bit value */
                write_toggle(dev, ep, dir_out);
                writeb(interval, &musbr->rxinterval);

                /* Program the RxType register */
                type = (devspeed << MUSB_TYPE_SPEED_SHIFT) |
                           (MUSB_TYPE_PROTO_INTR << MUSB_TYPE_PROTO_SHIFT) |
                           (ep & MUSB_TYPE_REMOTE_END);
                writeb(type, &musbr->rxtype);

                /* Write the maximum packet size to the RxMaxp register */
                writew(dev->epmaxpacketin[ep], &musbr->rxmaxp);

                while (txlen < len) {
                        nextlen = ((len-txlen) < dev->epmaxpacketin[ep]) ?
                                        (len-txlen) : dev->epmaxpacketin[ep];

                        /* Set the ReqPkt bit */
                        csr = readw(&musbr->rxcsr);
                        writew(csr | MUSB_RXCSR_H_REQPKT, &musbr->rxcsr);

                        /* Wait until the RxPktRdy bit is set */
                        if (!wait_until_rxep_ready(dev, MUSB_INTR_EP)) {
                                csr = readw(&musbr->rxcsr);
                                usb_settoggle(dev, ep, dir_out,
                                (csr >> MUSB_S_RXCSR_H_DATATOGGLE) & 1);
                                csr &= ~MUSB_RXCSR_RXPKTRDY;
                                writew(csr, &musbr->rxcsr);
                                dev->act_len = txlen;
                                return 0;
                        }

                        /* Read the data from the FIFO */
                        read_fifo(MUSB_INTR_EP, nextlen,
                                        (void *)(((u8 *)buffer) + txlen));

                        /* Clear the RxPktRdy bit */
                        csr =  readw(&musbr->rxcsr);
                        csr &= ~MUSB_RXCSR_RXPKTRDY;
                        writew(csr, &musbr->rxcsr);
                        txlen += nextlen;
                }

                /* Keep a copy of the data toggle bit */
                csr = readw(&musbr->rxcsr);
                usb_settoggle(dev, ep, dir_out,
                                (csr >> MUSB_S_RXCSR_H_DATATOGGLE) & 1);
        }

        /* interrupt transfer is complete */
        dev->irq_status = 0;
        dev->irq_act_len = len;
        dev->irq_handle(dev);
        dev->status = 0;
        dev->act_len = len;
        return 0;
}