/*-
 * Copyright (c) 2007-2008, Juniper Networks, Inc.
 * Copyright (c) 2008, Excito Elektronik i Skåne AB
 * Copyright (c) 2008, Michael Trimarchi <trimarchimichael@yahoo.it>
 *
 * All rights reserved.
 *
 * 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 version 2 of
 * the License.
 *
 * 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
 */
#include <common.h>
#include <asm/byteorder.h>
#include <usb.h>
#include <asm/io.h>
#include <malloc.h>
#include <watchdog.h>

#include "ehci.h"

int rootdev;
struct ehci_hccr *hccr; /* R/O registers, not need for volatile */
volatile struct ehci_hcor *hcor;

static uint16_t portreset;
static struct QH qh_list __attribute__((aligned(32)));

static struct descriptor {
        struct usb_hub_descriptor hub;
        struct usb_device_descriptor device;
        struct usb_linux_config_descriptor config;
        struct usb_linux_interface_descriptor interface;
        struct usb_endpoint_descriptor endpoint;
}  __attribute__ ((packed)) descriptor = {
        {
                0x8,            /* bDescLength */
                0x29,           /* bDescriptorType: hub descriptor */
                2,              /* bNrPorts -- runtime modified */
                0,              /* wHubCharacteristics */
                0xff,           /* bPwrOn2PwrGood */
                0,              /* bHubCntrCurrent */
                {},             /* Device removable */
                {}              /* at most 7 ports! XXX */
        },
        {
                0x12,           /* bLength */
                1,              /* bDescriptorType: UDESC_DEVICE */
                cpu_to_le16(0x0200), /* bcdUSB: v2.0 */
                9,              /* bDeviceClass: UDCLASS_HUB */
                0,              /* bDeviceSubClass: UDSUBCLASS_HUB */
                1,              /* bDeviceProtocol: UDPROTO_HSHUBSTT */
                64,             /* bMaxPacketSize: 64 bytes */
                0x0000,         /* idVendor */
                0x0000,         /* idProduct */
                cpu_to_le16(0x0100), /* bcdDevice */
                1,              /* iManufacturer */
                2,              /* iProduct */
                0,              /* iSerialNumber */
                1               /* bNumConfigurations: 1 */
        },
        {
                0x9,
                2,              /* bDescriptorType: UDESC_CONFIG */
                cpu_to_le16(0x19),
                1,              /* bNumInterface */
                1,              /* bConfigurationValue */
                0,              /* iConfiguration */
                0x40,           /* bmAttributes: UC_SELF_POWER */
                0               /* bMaxPower */
        },
        {
                0x9,            /* bLength */
                4,              /* bDescriptorType: UDESC_INTERFACE */
                0,              /* bInterfaceNumber */
                0,              /* bAlternateSetting */
                1,              /* bNumEndpoints */
                9,              /* bInterfaceClass: UICLASS_HUB */
                0,              /* bInterfaceSubClass: UISUBCLASS_HUB */
                0,              /* bInterfaceProtocol: UIPROTO_HSHUBSTT */
                0               /* iInterface */
        },
        {
                0x7,            /* bLength */
                5,              /* bDescriptorType: UDESC_ENDPOINT */
                0x81,           /* bEndpointAddress:
                                 * UE_DIR_IN | EHCI_INTR_ENDPT
                                 */
                3,              /* bmAttributes: UE_INTERRUPT */
                8,              /* wMaxPacketSize */
                255             /* bInterval */
        },
};

#if defined(CONFIG_EHCI_IS_TDI)
#define ehci_is_TDI()   (1)
#else
#define ehci_is_TDI()   (0)
#endif

#if defined(CONFIG_EHCI_DCACHE)
/*
 * Routines to handle (flush/invalidate) the dcache for the QH and qTD
 * structures and data buffers. This is needed on platforms using this
 * EHCI support with dcache enabled.
 */
static void flush_invalidate(u32 addr, int size, int flush)
{
        if (flush)
                flush_dcache_range(addr, addr + size);
        else
                invalidate_dcache_range(addr, addr + size);
}

static void cache_qtd(struct qTD *qtd, int flush)
{
        u32 *ptr = (u32 *)qtd->qt_buffer[0];
        int len = (qtd->qt_token & 0x7fff0000) >> 16;

        flush_invalidate((u32)qtd, sizeof(struct qTD), flush);
        if (ptr && len)
                flush_invalidate((u32)ptr, len, flush);
}


static inline struct QH *qh_addr(struct QH *qh)
{
        return (struct QH *)((u32)qh & 0xffffffe0);
}

static void cache_qh(struct QH *qh, int flush)
{
        struct qTD *qtd;
        struct qTD *next;
        static struct qTD *first_qtd;

        /*
         * Walk the QH list and flush/invalidate all entries
         */
        while (1) {
                flush_invalidate((u32)qh_addr(qh), sizeof(struct QH), flush);
                if ((u32)qh & QH_LINK_TYPE_QH)
                        break;
                qh = qh_addr(qh);
                qh = (struct QH *)qh->qh_link;
        }
        qh = qh_addr(qh);

        /*
         * Save first qTD pointer, needed for invalidating pass on this QH
         */
        if (flush)
                first_qtd = qtd = (struct qTD *)(*(u32 *)&qh->qh_overlay &
                                                 0xffffffe0);
        else
                qtd = first_qtd;

        /*
         * Walk the qTD list and flush/invalidate all entries
         */
        while (1) {
                if (qtd == NULL)
                        break;
                cache_qtd(qtd, flush);
                next = (struct qTD *)((u32)qtd->qt_next & 0xffffffe0);
                if (next == qtd)
                        break;
                qtd = next;
        }
}

static inline void ehci_flush_dcache(struct QH *qh)
{
        cache_qh(qh, 1);
}

static inline void ehci_invalidate_dcache(struct QH *qh)
{
        cache_qh(qh, 0);
}
#else /* CONFIG_EHCI_DCACHE */
/*
 *
 */
static inline void ehci_flush_dcache(struct QH *qh)
{
}

static inline void ehci_invalidate_dcache(struct QH *qh)
{
}
#endif /* CONFIG_EHCI_DCACHE */

static int handshake(uint32_t *ptr, uint32_t mask, uint32_t done, int usec)
{
        uint32_t result;
        do {
                result = ehci_readl(ptr);
                udelay(5);
                if (result == ~(uint32_t)0)
                        return -1;
                result &= mask;
                if (result == done)
                        return 0;
                usec--;
        } while (usec > 0);
        return -1;
}

static void ehci_free(void *p, size_t sz)
{

}

static int ehci_reset(void)
{
        uint32_t cmd;
        uint32_t tmp;
        uint32_t *reg_ptr;
        int ret = 0;

        cmd = ehci_readl(&hcor->or_usbcmd);
        cmd = (cmd & ~CMD_RUN) | CMD_RESET;
        ehci_writel(&hcor->or_usbcmd, cmd);
        ret = handshake((uint32_t *)&hcor->or_usbcmd, CMD_RESET, 0, 250 * 1000);
        if (ret < 0) {
                printf("EHCI fail to reset\n");
                goto out;
        }

        if (ehci_is_TDI()) {
                reg_ptr = (uint32_t *)((u8 *)hcor + USBMODE);
                tmp = ehci_readl(reg_ptr);
                tmp |= USBMODE_CM_HC;
#if defined(CONFIG_EHCI_MMIO_BIG_ENDIAN)
                tmp |= USBMODE_BE;
#endif
                ehci_writel(reg_ptr, tmp);
        }
out:
        return ret;
}

static void *ehci_alloc(size_t sz, size_t align)
{
        static struct QH qh __attribute__((aligned(32)));
        static struct qTD td[3] __attribute__((aligned (32)));
        static int ntds;
        void *p;

        switch (sz) {
        case sizeof(struct QH):
                p = &qh;
                ntds = 0;
                break;
        case sizeof(struct qTD):
                if (ntds == 3) {
                        debug("out of TDs\n");
                        return NULL;
                }
                p = &td[ntds];
                ntds++;
                break;
        default:
                debug("unknown allocation size\n");
                return NULL;
        }

        memset(p, 0, sz);
        return p;
}

static int ehci_td_buffer(struct qTD *td, void *buf, size_t sz)
{
        uint32_t addr, delta, next;
        int idx;

        addr = (uint32_t) buf;
        idx = 0;
        while (idx < 5) {
                td->qt_buffer[idx] = cpu_to_hc32(addr);
                td->qt_buffer_hi[idx] = 0;
                next = (addr + 4096) & ~4095;
                delta = next - addr;
                if (delta >= sz)
                        break;
                sz -= delta;
                addr = next;
                idx++;
        }

        if (idx == 5) {
                debug("out of buffer pointers (%u bytes left)\n", sz);
                return -1;
        }

        return 0;
}

static int
ehci_submit_async(struct usb_device *dev, unsigned long pipe, void *buffer,
                   int length, struct devrequest *req)
{
        struct QH *qh;
        struct qTD *td;
        volatile struct qTD *vtd;
        unsigned long ts;
        uint32_t *tdp;
        uint32_t endpt, token, usbsts;
        uint32_t c, toggle;
        uint32_t cmd;
        int timeout;
        int ret = 0;

        debug("dev=%p, pipe=%lx, buffer=%p, length=%d, req=%p\n", dev, pipe,
              buffer, length, req);
        if (req != NULL)
                debug("req=%u (%#x), type=%u (%#x), value=%u (%#x), index=%u\n",
                      req->request, req->request,
                      req->requesttype, req->requesttype,
                      le16_to_cpu(req->value), le16_to_cpu(req->value),
                      le16_to_cpu(req->index));

        qh = ehci_alloc(sizeof(struct QH), 32);
        if (qh == NULL) {
                debug("unable to allocate QH\n");
                return -1;
        }
        qh->qh_link = cpu_to_hc32((uint32_t)&qh_list | QH_LINK_TYPE_QH);
        c = (usb_pipespeed(pipe) != USB_SPEED_HIGH &&
             usb_pipeendpoint(pipe) == 0) ? 1 : 0;
        endpt = (8 << 28) |
            (c << 27) |
            (usb_maxpacket(dev, pipe) << 16) |
            (0 << 15) |
            (1 << 14) |
            (usb_pipespeed(pipe) << 12) |
            (usb_pipeendpoint(pipe) << 8) |
            (0 << 7) | (usb_pipedevice(pipe) << 0);
        qh->qh_endpt1 = cpu_to_hc32(endpt);
        endpt = (1 << 30) |
            (dev->portnr << 23) |
            (dev->parent->devnum << 16) | (0 << 8) | (0 << 0);
        qh->qh_endpt2 = cpu_to_hc32(endpt);
        qh->qh_overlay.qt_next = cpu_to_hc32(QT_NEXT_TERMINATE);

        td = NULL;
        tdp = &qh->qh_overlay.qt_next;

        toggle =
            usb_gettoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));

        if (req != NULL) {
                td = ehci_alloc(sizeof(struct qTD), 32);
                if (td == NULL) {
                        debug("unable to allocate SETUP td\n");
                        goto fail;
                }
                td->qt_next = cpu_to_hc32(QT_NEXT_TERMINATE);
                td->qt_altnext = cpu_to_hc32(QT_NEXT_TERMINATE);
                token = (0 << 31) |
                    (sizeof(*req) << 16) |
                    (0 << 15) | (0 << 12) | (3 << 10) | (2 << 8) | (0x80 << 0);
                td->qt_token = cpu_to_hc32(token);
                if (ehci_td_buffer(td, req, sizeof(*req)) != 0) {
                        debug("unable construct SETUP td\n");
                        ehci_free(td, sizeof(*td));
                        goto fail;
                }
                *tdp = cpu_to_hc32((uint32_t) td);
                tdp = &td->qt_next;
                toggle = 1;
        }

        if (length > 0 || req == NULL) {
                td = ehci_alloc(sizeof(struct qTD), 32);
                if (td == NULL) {
                        debug("unable to allocate DATA td\n");
                        goto fail;
                }
                td->qt_next = cpu_to_hc32(QT_NEXT_TERMINATE);
                td->qt_altnext = cpu_to_hc32(QT_NEXT_TERMINATE);
                token = (toggle << 31) |
                    (length << 16) |
                    ((req == NULL ? 1 : 0) << 15) |
                    (0 << 12) |
                    (3 << 10) |
                    ((usb_pipein(pipe) ? 1 : 0) << 8) | (0x80 << 0);
                td->qt_token = cpu_to_hc32(token);
                if (ehci_td_buffer(td, buffer, length) != 0) {
                        debug("unable construct DATA td\n");
                        ehci_free(td, sizeof(*td));
                        goto fail;
                }
                *tdp = cpu_to_hc32((uint32_t) td);
                tdp = &td->qt_next;
        }

        if (req != NULL) {
                td = ehci_alloc(sizeof(struct qTD), 32);
                if (td == NULL) {
                        debug("unable to allocate ACK td\n");
                        goto fail;
                }
                td->qt_next = cpu_to_hc32(QT_NEXT_TERMINATE);
                td->qt_altnext = cpu_to_hc32(QT_NEXT_TERMINATE);
                token = (toggle << 31) |
                    (0 << 16) |
                    (1 << 15) |
                    (0 << 12) |
                    (3 << 10) |
                    ((usb_pipein(pipe) ? 0 : 1) << 8) | (0x80 << 0);
                td->qt_token = cpu_to_hc32(token);
                *tdp = cpu_to_hc32((uint32_t) td);
                tdp = &td->qt_next;
        }

        qh_list.qh_link = cpu_to_hc32((uint32_t) qh | QH_LINK_TYPE_QH);

        /* Flush dcache */
        ehci_flush_dcache(&qh_list);

        usbsts = ehci_readl(&hcor->or_usbsts);
        ehci_writel(&hcor->or_usbsts, (usbsts & 0x3f));

        /* Enable async. schedule. */
        cmd = ehci_readl(&hcor->or_usbcmd);
        cmd |= CMD_ASE;
        ehci_writel(&hcor->or_usbcmd, cmd);

        ret = handshake((uint32_t *)&hcor->or_usbsts, STD_ASS, STD_ASS,
                        100 * 1000);
        if (ret < 0) {
                printf("EHCI fail timeout STD_ASS set\n");
                goto fail;
        }

        /* Wait for TDs to be processed. */
        ts = get_timer(0);
        vtd = td;
        timeout = USB_TIMEOUT_MS(pipe);
        do {
                /* Invalidate dcache */
                ehci_invalidate_dcache(&qh_list);
                token = hc32_to_cpu(vtd->qt_token);
                if (!(token & 0x80))
                        break;
                WATCHDOG_RESET();
        } while (get_timer(ts) < timeout);

        /* Check that the TD processing happened */
        if (token & 0x80) {
                printf("EHCI timed out on TD - token=%#x\n", token);
        }

        /* Disable async schedule. */
        cmd = ehci_readl(&hcor->or_usbcmd);
        cmd &= ~CMD_ASE;
        ehci_writel(&hcor->or_usbcmd, cmd);

        ret = handshake((uint32_t *)&hcor->or_usbsts, STD_ASS, 0,
                        100 * 1000);
        if (ret < 0) {
                printf("EHCI fail timeout STD_ASS reset\n");
                goto fail;
        }

        qh_list.qh_link = cpu_to_hc32((uint32_t)&qh_list | QH_LINK_TYPE_QH);

        token = hc32_to_cpu(qh->qh_overlay.qt_token);
        if (!(token & 0x80)) {
                debug("TOKEN=%#x\n", token);
                switch (token & 0xfc) {
                case 0:
                        toggle = token >> 31;
                        usb_settoggle(dev, usb_pipeendpoint(pipe),
                                       usb_pipeout(pipe), toggle);
                        dev->status = 0;
                        break;
                case 0x40:
                        dev->status = USB_ST_STALLED;
                        break;
                case 0xa0:
                case 0x20:
                        dev->status = USB_ST_BUF_ERR;
                        break;
                case 0x50:
                case 0x10:
                        dev->status = USB_ST_BABBLE_DET;
                        break;
                default:
                        dev->status = USB_ST_CRC_ERR;
                        if ((token & 0x40) == 0x40)
                                dev->status |= USB_ST_STALLED;
                        break;
                }
                dev->act_len = length - ((token >> 16) & 0x7fff);
        } else {
                dev->act_len = 0;
                debug("dev=%u, usbsts=%#x, p[1]=%#x, p[2]=%#x\n",
                      dev->devnum, ehci_readl(&hcor->or_usbsts),
                      ehci_readl(&hcor->or_portsc[0]),
                      ehci_readl(&hcor->or_portsc[1]));
        }

        return (dev->status != USB_ST_NOT_PROC) ? 0 : -1;

fail:
        td = (void *)hc32_to_cpu(qh->qh_overlay.qt_next);
        while (td != (void *)QT_NEXT_TERMINATE) {
                qh->qh_overlay.qt_next = td->qt_next;
                ehci_free(td, sizeof(*td));
                td = (void *)hc32_to_cpu(qh->qh_overlay.qt_next);
        }
        ehci_free(qh, sizeof(*qh));
        return -1;
}

static inline int min3(int a, int b, int c)
{

        if (b < a)
                a = b;
        if (c < a)
                a = c;
        return a;
}

int
ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
                 int length, struct devrequest *req)
{
        uint8_t tmpbuf[4];
        u16 typeReq;
        void *srcptr = NULL;
        int len, srclen;
        uint32_t reg;
        uint32_t *status_reg;

        if (le16_to_cpu(req->index) > CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS) {
                printf("The request port(%d) is not configured\n",
                        le16_to_cpu(req->index) - 1);
                return -1;
        }
        status_reg = (uint32_t *)&hcor->or_portsc[
                                                le16_to_cpu(req->index) - 1];
        srclen = 0;

        debug("req=%u (%#x), type=%u (%#x), value=%u, index=%u\n",
              req->request, req->request,
              req->requesttype, req->requesttype,
              le16_to_cpu(req->value), le16_to_cpu(req->index));

        typeReq = req->request | req->requesttype << 8;

        switch (typeReq) {
        case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
                switch (le16_to_cpu(req->value) >> 8) {
                case USB_DT_DEVICE:
                        debug("USB_DT_DEVICE request\n");
                        srcptr = &descriptor.device;
                        srclen = 0x12;
                        break;
                case USB_DT_CONFIG:
                        debug("USB_DT_CONFIG config\n");
                        srcptr = &descriptor.config;
                        srclen = 0x19;
                        break;
                case USB_DT_STRING:
                        debug("USB_DT_STRING config\n");
                        switch (le16_to_cpu(req->value) & 0xff) {
                        case 0: /* Language */
                                srcptr = "\4\3\1\0";
                                srclen = 4;
                                break;
                        case 1: /* Vendor */
                                srcptr = "\16\3u\0-\0b\0o\0o\0t\0";
                                srclen = 14;
                                break;
                        case 2: /* Product */
                                srcptr = "\52\3E\0H\0C\0I\0 "
                                         "\0H\0o\0s\0t\0 "
                                         "\0C\0o\0n\0t\0r\0o\0l\0l\0e\0r\0";
                                srclen = 42;
                                break;
                        default:
                                debug("unknown value DT_STRING %x\n",
                                        le16_to_cpu(req->value));
                                goto unknown;
                        }
                        break;
                default:
                        debug("unknown value %x\n", le16_to_cpu(req->value));
                        goto unknown;
                }
                break;
        case USB_REQ_GET_DESCRIPTOR | ((USB_DIR_IN | USB_RT_HUB) << 8):
                switch (le16_to_cpu(req->value) >> 8) {
                case USB_DT_HUB:
                        debug("USB_DT_HUB config\n");
                        srcptr = &descriptor.hub;
                        srclen = 0x8;
                        break;
                default:
                        debug("unknown value %x\n", le16_to_cpu(req->value));
                        goto unknown;
                }
                break;
        case USB_REQ_SET_ADDRESS | (USB_RECIP_DEVICE << 8):
                debug("USB_REQ_SET_ADDRESS\n");
                rootdev = le16_to_cpu(req->value);
                break;
        case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
                debug("USB_REQ_SET_CONFIGURATION\n");
                /* Nothing to do */
                break;
        case USB_REQ_GET_STATUS | ((USB_DIR_IN | USB_RT_HUB) << 8):
                tmpbuf[0] = 1;  /* USB_STATUS_SELFPOWERED */
                tmpbuf[1] = 0;
                srcptr = tmpbuf;
                srclen = 2;
                break;
        case USB_REQ_GET_STATUS | ((USB_RT_PORT | USB_DIR_IN) << 8):
                memset(tmpbuf, 0, 4);
                reg = ehci_readl(status_reg);
                if (reg & EHCI_PS_CS)
                        tmpbuf[0] |= USB_PORT_STAT_CONNECTION;
                if (reg & EHCI_PS_PE)
                        tmpbuf[0] |= USB_PORT_STAT_ENABLE;
                if (reg & EHCI_PS_SUSP)
                        tmpbuf[0] |= USB_PORT_STAT_SUSPEND;
                if (reg & EHCI_PS_OCA)
                        tmpbuf[0] |= USB_PORT_STAT_OVERCURRENT;
                if (reg & EHCI_PS_PR)
                        tmpbuf[0] |= USB_PORT_STAT_RESET;
                if (reg & EHCI_PS_PP)
                        tmpbuf[1] |= USB_PORT_STAT_POWER >> 8;

                if (ehci_is_TDI()) {
                        switch ((reg >> 26) & 3) {
                        case 0:
                                break;
                        case 1:
                                tmpbuf[1] |= USB_PORT_STAT_LOW_SPEED >> 8;
                                break;
                        case 2:
                        default:
                                tmpbuf[1] |= USB_PORT_STAT_HIGH_SPEED >> 8;
                                break;
                        }
                } else {
                        tmpbuf[1] |= USB_PORT_STAT_HIGH_SPEED >> 8;
                }

                if (reg & EHCI_PS_CSC)
                        tmpbuf[2] |= USB_PORT_STAT_C_CONNECTION;
                if (reg & EHCI_PS_PEC)
                        tmpbuf[2] |= USB_PORT_STAT_C_ENABLE;
                if (reg & EHCI_PS_OCC)
                        tmpbuf[2] |= USB_PORT_STAT_C_OVERCURRENT;
                if (portreset & (1 << le16_to_cpu(req->index)))
                        tmpbuf[2] |= USB_PORT_STAT_C_RESET;

                srcptr = tmpbuf;
                srclen = 4;
                break;
        case USB_REQ_SET_FEATURE | ((USB_DIR_OUT | USB_RT_PORT) << 8):
                reg = ehci_readl(status_reg);
                reg &= ~EHCI_PS_CLEAR;
                switch (le16_to_cpu(req->value)) {
                case USB_PORT_FEAT_ENABLE:
                        reg |= EHCI_PS_PE;
                        ehci_writel(status_reg, reg);
                        break;
                case USB_PORT_FEAT_POWER:
                        if (HCS_PPC(ehci_readl(&hccr->cr_hcsparams))) {
                                reg |= EHCI_PS_PP;
                                ehci_writel(status_reg, reg);
                        }
                        break;
                case USB_PORT_FEAT_RESET:
                        if ((reg & (EHCI_PS_PE | EHCI_PS_CS)) == EHCI_PS_CS &&
                            !ehci_is_TDI() &&
                            EHCI_PS_IS_LOWSPEED(reg)) {
                                /* Low speed device, give up ownership. */
                                debug("port %d low speed --> companion\n",
                                      req->index - 1);
                                reg |= EHCI_PS_PO;
                                ehci_writel(status_reg, reg);
                                break;
                        } else {
                                int ret;

                                reg |= EHCI_PS_PR;
                                reg &= ~EHCI_PS_PE;
                                ehci_writel(status_reg, reg);
                                /*
                                 * caller must wait, then call GetPortStatus
                                 * usb 2.0 specification say 50 ms resets on
                                 * root
                                 */
                                wait_ms(50);
                                /* terminate the reset */
                                ehci_writel(status_reg, reg & ~EHCI_PS_PR);
                                /*
                                 * A host controller must terminate the reset
                                 * and stabilize the state of the port within
                                 * 2 milliseconds
                                 */
                                ret = handshake(status_reg, EHCI_PS_PR, 0,
                                                2 * 1000);
                                if (!ret)
                                        portreset |=
                                                1 << le16_to_cpu(req->index);
                                else
                                        printf("port(%d) reset error\n",
                                        le16_to_cpu(req->index) - 1);
                        }
                        break;
                default:
                        debug("unknown feature %x\n", le16_to_cpu(req->value));
                        goto unknown;
                }
                /* unblock posted writes */
                (void) ehci_readl(&hcor->or_usbcmd);
                break;
        case USB_REQ_CLEAR_FEATURE | ((USB_DIR_OUT | USB_RT_PORT) << 8):
                reg = ehci_readl(status_reg);
                switch (le16_to_cpu(req->value)) {
                case USB_PORT_FEAT_ENABLE:
                        reg &= ~EHCI_PS_PE;
                        break;
                case USB_PORT_FEAT_C_ENABLE:
                        reg = (reg & ~EHCI_PS_CLEAR) | EHCI_PS_PE;
                        break;
                case USB_PORT_FEAT_POWER:
                        if (HCS_PPC(ehci_readl(&hccr->cr_hcsparams)))
                                reg = reg & ~(EHCI_PS_CLEAR | EHCI_PS_PP);
                case USB_PORT_FEAT_C_CONNECTION:
                        reg = (reg & ~EHCI_PS_CLEAR) | EHCI_PS_CSC;
                        break;
                case USB_PORT_FEAT_OVER_CURRENT:
                        reg = (reg & ~EHCI_PS_CLEAR) | EHCI_PS_OCC;
                        break;
                case USB_PORT_FEAT_C_RESET:
                        portreset &= ~(1 << le16_to_cpu(req->index));
                        break;
                default:
                        debug("unknown feature %x\n", le16_to_cpu(req->value));
                        goto unknown;
                }
                ehci_writel(status_reg, reg);
                /* unblock posted write */
                (void) ehci_readl(&hcor->or_usbcmd);
                break;
        default:
                debug("Unknown request\n");
                goto unknown;
        }

        wait_ms(1);
        len = min3(srclen, le16_to_cpu(req->length), length);
        if (srcptr != NULL && len > 0)
                memcpy(buffer, srcptr, len);
        else
                debug("Len is 0\n");

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

unknown:
        debug("requesttype=%x, request=%x, value=%x, index=%x, length=%x\n",
              req->requesttype, req->request, le16_to_cpu(req->value),
              le16_to_cpu(req->index), le16_to_cpu(req->length));

        dev->act_len = 0;
        dev->status = USB_ST_STALLED;
        return -1;
}

int usb_lowlevel_stop(void)
{
        return ehci_hcd_stop();
}

int usb_lowlevel_init(void)
{
        uint32_t reg;
        uint32_t cmd;

        if (ehci_hcd_init() != 0)
                return -1;

        /* EHCI spec section 4.1 */
        if (ehci_reset() != 0)
                return -1;

#if defined(CONFIG_EHCI_HCD_INIT_AFTER_RESET)
        if (ehci_hcd_init() != 0)
                return -1;
#endif

        /* Set head of reclaim list */
        memset(&qh_list, 0, sizeof(qh_list));
        qh_list.qh_link = cpu_to_hc32((uint32_t)&qh_list | QH_LINK_TYPE_QH);
        qh_list.qh_endpt1 = cpu_to_hc32((1 << 15) | (USB_SPEED_HIGH << 12));
        qh_list.qh_curtd = cpu_to_hc32(QT_NEXT_TERMINATE);
        qh_list.qh_overlay.qt_next = cpu_to_hc32(QT_NEXT_TERMINATE);
        qh_list.qh_overlay.qt_altnext = cpu_to_hc32(QT_NEXT_TERMINATE);
        qh_list.qh_overlay.qt_token = cpu_to_hc32(0x40);

        /* Set async. queue head pointer. */
        ehci_writel(&hcor->or_asynclistaddr, (uint32_t)&qh_list);

        reg = ehci_readl(&hccr->cr_hcsparams);
        descriptor.hub.bNbrPorts = HCS_N_PORTS(reg);
        printf("Register %x NbrPorts %d\n", reg, descriptor.hub.bNbrPorts);
        /* Port Indicators */
        if (HCS_INDICATOR(reg))
                descriptor.hub.wHubCharacteristics |= 0x80;
        /* Port Power Control */
        if (HCS_PPC(reg))
                descriptor.hub.wHubCharacteristics |= 0x01;

        /* Start the host controller. */
        cmd = ehci_readl(&hcor->or_usbcmd);
        /*
         * Philips, Intel, and maybe others need CMD_RUN before the
         * root hub will detect new devices (why?); NEC doesn't
         */
        cmd &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
        cmd |= CMD_RUN;
        ehci_writel(&hcor->or_usbcmd, cmd);

        /* take control over the ports */
        cmd = ehci_readl(&hcor->or_configflag);
        cmd |= FLAG_CF;
        ehci_writel(&hcor->or_configflag, cmd);
        /* unblock posted write */
        cmd = ehci_readl(&hcor->or_usbcmd);
        wait_ms(5);
        reg = HC_VERSION(ehci_readl(&hccr->cr_capbase));
        printf("USB EHCI %x.%02x\n", reg >> 8, reg & 0xff);

        rootdev = 0;

        return 0;
}

int
submit_bulk_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
                int length)
{

        if (usb_pipetype(pipe) != PIPE_BULK) {
                debug("non-bulk pipe (type=%lu)", usb_pipetype(pipe));
                return -1;
        }
        return ehci_submit_async(dev, pipe, buffer, length, NULL);
}

int
submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
                   int length, struct devrequest *setup)
{

        if (usb_pipetype(pipe) != PIPE_CONTROL) {
                debug("non-control pipe (type=%lu)", usb_pipetype(pipe));
                return -1;
        }

        if (usb_pipedevice(pipe) == rootdev) {
                if (rootdev == 0)
                        dev->speed = USB_SPEED_HIGH;
                return ehci_submit_root(dev, pipe, buffer, length, setup);
        }
        return ehci_submit_async(dev, pipe, buffer, length, setup);
}

int
submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
               int length, int interval)
{

        debug("dev=%p, pipe=%lu, buffer=%p, length=%d, interval=%d",
              dev, pipe, buffer, length, interval);
        return -1;
}