host.c

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/*
 * host.c - ChipIdea USB host controller driver
 *
 * Copyright (c) 2012 Intel Corporation
 *
 * Author: Alexander Shishkin
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/kernel.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/usb/chipidea.h>

#define CHIPIDEA_EHCI
#include "../host/ehci-hcd.c"

#include "ci.h"
#include "bits.h"
#include "host.h"

static int ci_ehci_setup(struct usb_hcd *hcd)
{
    struct ehci_hcd *ehci = hcd_to_ehci(hcd);
    int ret;

    hcd->has_tt = 1;

    ret = ehci_setup(hcd);
    if (ret)
        return ret;

    ehci_port_power(ehci, 0);

    return ret;
}

static const struct hc_driver ci_ehci_hc_driver = {
    .description    = "ehci_hcd",
    .product_desc   = "ChipIdea HDRC EHCI",
    .hcd_priv_size  = sizeof(struct ehci_hcd),

    /*
     * generic hardware linkage
     */
    .irq    = ehci_irq,
    .flags  = HCD_MEMORY | HCD_USB2,

    /*
     * basic lifecycle operations
     */
    .reset      = ci_ehci_setup,
    .start      = ehci_run,
    .stop       = ehci_stop,
    .shutdown   = ehci_shutdown,

    /*
     * managing i/o requests and associated device resources
     */
    .urb_enqueue        = ehci_urb_enqueue,
    .urb_dequeue        = ehci_urb_dequeue,
    .endpoint_disable   = ehci_endpoint_disable,
    .endpoint_reset     = ehci_endpoint_reset,

    /*
     * scheduling support
     */
    .get_frame_number = ehci_get_frame,

    /*
     * root hub support
     */
    .hub_status_data    = ehci_hub_status_data,
    .hub_control        = ehci_hub_control,
    .bus_suspend        = ehci_bus_suspend,
    .bus_resume     = ehci_bus_resume,
    .relinquish_port    = ehci_relinquish_port,
    .port_handed_over   = ehci_port_handed_over,

    .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};

static irqreturn_t host_irq(struct ci13xxx *ci)
{
    return usb_hcd_irq(ci->irq, ci->hcd);
}

static int host_start(struct ci13xxx *ci)
{
    struct usb_hcd *hcd;
    struct ehci_hcd *ehci;
    int ret;

    if (usb_disabled())
        return -ENODEV;

    hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
    if (!hcd)
        return -ENOMEM;

    dev_set_drvdata(ci->dev, ci);
    hcd->rsrc_start = ci->hw_bank.phys;
    hcd->rsrc_len = ci->hw_bank.size;
    hcd->regs = ci->hw_bank.abs;
    hcd->has_tt = 1;

    hcd->power_budget = ci->platdata->power_budget;
    hcd->phy = ci->transceiver;

    ehci = hcd_to_ehci(hcd);
    ehci->caps = ci->hw_bank.cap;
    ehci->has_hostpc = ci->hw_bank.lpm;

    ret = usb_add_hcd(hcd, 0, 0);
    if (ret)
        usb_put_hcd(hcd);
    else
        ci->hcd = hcd;

    return ret;
}

static void host_stop(struct ci13xxx *ci)
{
    struct usb_hcd *hcd = ci->hcd;

    usb_remove_hcd(hcd);
    usb_put_hcd(hcd);
}

int ci_hdrc_host_init(struct ci13xxx *ci)
{
    struct ci_role_driver *rdrv;

    if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
        return -ENXIO;

    rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
    if (!rdrv)
        return -ENOMEM;

    rdrv->start = host_start;
    rdrv->stop  = host_stop;
    rdrv->irq   = host_irq;
    rdrv->name  = "host";
    ci->roles[CI_ROLE_HOST] = rdrv;

    return 0;
}