/*
 * Wireless Host Controller (WHC) driver.
 *
 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/uwb/umc.h>

#include "../../wusbcore/wusbhc.h"

#include "whcd.h"

/*
 * One time initialization.
 *
 * Nothing to do here.
 */
static int whc_reset(struct usb_hcd *usb_hcd)
{
        return 0;
}

/*
 * Start the wireless host controller.
 *
 * Start device notification.
 *
 * Put hc into run state, set DNTS parameters.
 */
static int whc_start(struct usb_hcd *usb_hcd)
{
        struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
        struct whc *whc = wusbhc_to_whc(wusbhc);
        u8 bcid;
        int ret;

        mutex_lock(&wusbhc->mutex);

        le_writel(WUSBINTR_GEN_CMD_DONE
                  | WUSBINTR_HOST_ERR
                  | WUSBINTR_ASYNC_SCHED_SYNCED
                  | WUSBINTR_DNTS_INT
                  | WUSBINTR_ERR_INT
                  | WUSBINTR_INT,
                  whc->base + WUSBINTR);

        /* set cluster ID */
        bcid = wusb_cluster_id_get();
        ret = whc_set_cluster_id(whc, bcid);
        if (ret < 0)
                goto out;
        wusbhc->cluster_id = bcid;

        /* start HC */
        whc_write_wusbcmd(whc, WUSBCMD_RUN, WUSBCMD_RUN);

        usb_hcd->uses_new_polling = 1;
        set_bit(HCD_FLAG_POLL_RH, &usb_hcd->flags);
        usb_hcd->state = HC_STATE_RUNNING;

out:
        mutex_unlock(&wusbhc->mutex);
        return ret;
}


/*
 * Stop the wireless host controller.
 *
 * Stop device notification.
 *
 * Wait for pending transfer to stop? Put hc into stop state?
 */
static void whc_stop(struct usb_hcd *usb_hcd)
{
        struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
        struct whc *whc = wusbhc_to_whc(wusbhc);

        mutex_lock(&wusbhc->mutex);

        /* stop HC */
        le_writel(0, whc->base + WUSBINTR);
        whc_write_wusbcmd(whc, WUSBCMD_RUN, 0);
        whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
                      WUSBSTS_HCHALTED, WUSBSTS_HCHALTED,
                      100, "HC to halt");

        wusb_cluster_id_put(wusbhc->cluster_id);

        mutex_unlock(&wusbhc->mutex);
}

static int whc_get_frame_number(struct usb_hcd *usb_hcd)
{
        /* Frame numbers are not applicable to WUSB. */
        return -ENOSYS;
}


/*
 * Queue an URB to the ASL or PZL
 */
static int whc_urb_enqueue(struct usb_hcd *usb_hcd, struct urb *urb,
                           gfp_t mem_flags)
{
        struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
        struct whc *whc = wusbhc_to_whc(wusbhc);
        int ret;

        switch (usb_pipetype(urb->pipe)) {
        case PIPE_INTERRUPT:
                ret = pzl_urb_enqueue(whc, urb, mem_flags);
                break;
        case PIPE_ISOCHRONOUS:
                dev_err(&whc->umc->dev, "isochronous transfers unsupported\n");
                ret = -ENOTSUPP;
                break;
        case PIPE_CONTROL:
        case PIPE_BULK:
        default:
                ret = asl_urb_enqueue(whc, urb, mem_flags);
                break;
        };

        return ret;
}

/*
 * Remove a queued URB from the ASL or PZL.
 */
static int whc_urb_dequeue(struct usb_hcd *usb_hcd, struct urb *urb, int status)
{
        struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
        struct whc *whc = wusbhc_to_whc(wusbhc);
        int ret;

        switch (usb_pipetype(urb->pipe)) {
        case PIPE_INTERRUPT:
                ret = pzl_urb_dequeue(whc, urb, status);
                break;
        case PIPE_ISOCHRONOUS:
                ret = -ENOTSUPP;
                break;
        case PIPE_CONTROL:
        case PIPE_BULK:
        default:
                ret = asl_urb_dequeue(whc, urb, status);
                break;
        };

        return ret;
}

/*
 * Wait for all URBs to the endpoint to be completed, then delete the
 * qset.
 */
static void whc_endpoint_disable(struct usb_hcd *usb_hcd,
                                 struct usb_host_endpoint *ep)
{
        struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
        struct whc *whc = wusbhc_to_whc(wusbhc);
        struct whc_qset *qset;

        qset = ep->hcpriv;
        if (qset) {
                ep->hcpriv = NULL;
                if (usb_endpoint_xfer_bulk(&ep->desc)
                    || usb_endpoint_xfer_control(&ep->desc))
                        asl_qset_delete(whc, qset);
                else
                        pzl_qset_delete(whc, qset);
        }
}

static void whc_endpoint_reset(struct usb_hcd *usb_hcd,
                               struct usb_host_endpoint *ep)
{
        struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
        struct whc *whc = wusbhc_to_whc(wusbhc);
        struct whc_qset *qset;
        unsigned long flags;

        spin_lock_irqsave(&whc->lock, flags);

        qset = ep->hcpriv;
        if (qset) {
                qset->remove = 1;
                qset->reset = 1;

                if (usb_endpoint_xfer_bulk(&ep->desc)
                    || usb_endpoint_xfer_control(&ep->desc))
                        queue_work(whc->workqueue, &whc->async_work);
                else
                        queue_work(whc->workqueue, &whc->periodic_work);
        }

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


static struct hc_driver whc_hc_driver = {
        .description = "whci-hcd",
        .product_desc = "Wireless host controller",
        .hcd_priv_size = sizeof(struct whc) - sizeof(struct usb_hcd),
        .irq = whc_int_handler,
        .flags = HCD_USB2,

        .reset = whc_reset,
        .start = whc_start,
        .stop = whc_stop,
        .get_frame_number = whc_get_frame_number,
        .urb_enqueue = whc_urb_enqueue,
        .urb_dequeue = whc_urb_dequeue,
        .endpoint_disable = whc_endpoint_disable,
        .endpoint_reset = whc_endpoint_reset,

        .hub_status_data = wusbhc_rh_status_data,
        .hub_control = wusbhc_rh_control,
        .start_port_reset = wusbhc_rh_start_port_reset,
};

static int whc_probe(struct umc_dev *umc)
{
        int ret;
        struct usb_hcd *usb_hcd;
        struct wusbhc *wusbhc;
        struct whc *whc;
        struct device *dev = &umc->dev;

        usb_hcd = usb_create_hcd(&whc_hc_driver, dev, "whci");
        if (usb_hcd == NULL) {
                dev_err(dev, "unable to create hcd\n");
                return -ENOMEM;
        }

        usb_hcd->wireless = 1;
        usb_hcd->self.sg_tablesize = 2048; /* somewhat arbitrary */

        wusbhc = usb_hcd_to_wusbhc(usb_hcd);
        whc = wusbhc_to_whc(wusbhc);
        whc->umc = umc;

        ret = whc_init(whc);
        if (ret)
                goto error;

        wusbhc->dev = dev;
        wusbhc->uwb_rc = uwb_rc_get_by_grandpa(umc->dev.parent);
        if (!wusbhc->uwb_rc) {
                ret = -ENODEV;
                dev_err(dev, "cannot get radio controller\n");
                goto error;
        }

        if (whc->n_devices > USB_MAXCHILDREN) {
                dev_warn(dev, "USB_MAXCHILDREN too low for WUSB adapter (%u ports)\n",
                         whc->n_devices);
                wusbhc->ports_max = USB_MAXCHILDREN;
        } else
                wusbhc->ports_max = whc->n_devices;
        wusbhc->mmcies_max      = whc->n_mmc_ies;
        wusbhc->start           = whc_wusbhc_start;
        wusbhc->stop            = whc_wusbhc_stop;
        wusbhc->mmcie_add       = whc_mmcie_add;
        wusbhc->mmcie_rm        = whc_mmcie_rm;
        wusbhc->dev_info_set    = whc_dev_info_set;
        wusbhc->bwa_set         = whc_bwa_set;
        wusbhc->set_num_dnts    = whc_set_num_dnts;
        wusbhc->set_ptk         = whc_set_ptk;
        wusbhc->set_gtk         = whc_set_gtk;

        ret = wusbhc_create(wusbhc);
        if (ret)
                goto error_wusbhc_create;

        ret = usb_add_hcd(usb_hcd, whc->umc->irq, IRQF_SHARED);
        if (ret) {
                dev_err(dev, "cannot add HCD: %d\n", ret);
                goto error_usb_add_hcd;
        }

        ret = wusbhc_b_create(wusbhc);
        if (ret) {
                dev_err(dev, "WUSBHC phase B setup failed: %d\n", ret);
                goto error_wusbhc_b_create;
        }

        whc_dbg_init(whc);

        return 0;

error_wusbhc_b_create:
        usb_remove_hcd(usb_hcd);
error_usb_add_hcd:
        wusbhc_destroy(wusbhc);
error_wusbhc_create:
        uwb_rc_put(wusbhc->uwb_rc);
error:
        whc_clean_up(whc);
        if (usb_hcd)
                usb_put_hcd(usb_hcd);
        return ret;
}


static void whc_remove(struct umc_dev *umc)
{
        struct usb_hcd *usb_hcd = dev_get_drvdata(&umc->dev);
        struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
        struct whc *whc = wusbhc_to_whc(wusbhc);

        if (usb_hcd) {
                whc_dbg_clean_up(whc);
                wusbhc_b_destroy(wusbhc);
                usb_remove_hcd(usb_hcd);
                wusbhc_destroy(wusbhc);
                uwb_rc_put(wusbhc->uwb_rc);
                whc_clean_up(whc);
                usb_put_hcd(usb_hcd);
        }
}

static struct umc_driver whci_hc_driver = {
        .name =         "whci-hcd",
        .cap_id =       UMC_CAP_ID_WHCI_WUSB_HC,
        .probe =        whc_probe,
        .remove =       whc_remove,
};

static int __init whci_hc_driver_init(void)
{
        return umc_driver_register(&whci_hc_driver);
}
module_init(whci_hc_driver_init);

static void __exit whci_hc_driver_exit(void)
{
        umc_driver_unregister(&whci_hc_driver);
}
module_exit(whci_hc_driver_exit);

/* PCI device ID's that we handle (so it gets loaded) */
static struct pci_device_id __used whci_hcd_id_table[] = {
        { PCI_DEVICE_CLASS(PCI_CLASS_WIRELESS_WHCI, ~0) },
        { /* empty last entry */ }
};
MODULE_DEVICE_TABLE(pci, whci_hcd_id_table);

MODULE_DESCRIPTION("WHCI Wireless USB host controller driver");
MODULE_AUTHOR("Cambridge Silicon Radio Ltd.");
MODULE_LICENSE("GPL");