wusb.c

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/*
 * Wireless Host Controller (WHC) WUSB operations.
 *
 * 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/uwb/umc.h>

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

#include "whcd.h"

static int whc_update_di(struct whc *whc, int idx)
{
    int offset = idx / 32;
    u32 bit = 1 << (idx % 32);

    le_writel(bit, whc->base + WUSBDIBUPDATED + offset);

    return whci_wait_for(&whc->umc->dev,
                 whc->base + WUSBDIBUPDATED + offset, bit, 0,
                 100, "DI update");
}

/*
 * WHCI starts MMCs based on there being a valid GTK so these need
 * only start/stop the asynchronous and periodic schedules and send a
 * channel stop command.
 */

int whc_wusbhc_start(struct wusbhc *wusbhc)
{
    struct whc *whc = wusbhc_to_whc(wusbhc);

    asl_start(whc);
    pzl_start(whc);

    return 0;
}

void whc_wusbhc_stop(struct wusbhc *wusbhc, int delay)
{
    struct whc *whc = wusbhc_to_whc(wusbhc);
    u32 stop_time, now_time;
    int ret;

    pzl_stop(whc);
    asl_stop(whc);

    now_time = le_readl(whc->base + WUSBTIME) & WUSBTIME_CHANNEL_TIME_MASK;
    stop_time = (now_time + ((delay * 8) << 7)) & 0x00ffffff;
    ret = whc_do_gencmd(whc, WUSBGENCMDSTS_CHAN_STOP, stop_time, NULL, 0);
    if (ret == 0)
        msleep(delay);
}

int whc_mmcie_add(struct wusbhc *wusbhc, u8 interval, u8 repeat_cnt,
          u8 handle, struct wuie_hdr *wuie)
{
    struct whc *whc = wusbhc_to_whc(wusbhc);
    u32 params;

    params = (interval << 24)
        | (repeat_cnt << 16)
        | (wuie->bLength << 8)
        | handle;

    return whc_do_gencmd(whc, WUSBGENCMDSTS_MMCIE_ADD, params, wuie, wuie->bLength);
}

int whc_mmcie_rm(struct wusbhc *wusbhc, u8 handle)
{
    struct whc *whc = wusbhc_to_whc(wusbhc);
    u32 params;

    params = handle;

    return whc_do_gencmd(whc, WUSBGENCMDSTS_MMCIE_RM, params, NULL, 0);
}

int whc_bwa_set(struct wusbhc *wusbhc, s8 stream_index, const struct uwb_mas_bm *mas_bm)
{
    struct whc *whc = wusbhc_to_whc(wusbhc);

    if (stream_index >= 0)
        whc_write_wusbcmd(whc, WUSBCMD_WUSBSI_MASK, WUSBCMD_WUSBSI(stream_index));

    return whc_do_gencmd(whc, WUSBGENCMDSTS_SET_MAS, 0, (void *)mas_bm, sizeof(*mas_bm));
}

int whc_dev_info_set(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev)
{
    struct whc *whc = wusbhc_to_whc(wusbhc);
    int idx = wusb_dev->port_idx;
    struct di_buf_entry *di = &whc->di_buf[idx];
    int ret;

    mutex_lock(&whc->mutex);

    uwb_mas_bm_copy_le(di->availability_info, &wusb_dev->availability);
    di->addr_sec_info &= ~(WHC_DI_DISABLE | WHC_DI_DEV_ADDR_MASK);
    di->addr_sec_info |= WHC_DI_DEV_ADDR(wusb_dev->addr);

    ret = whc_update_di(whc, idx);

    mutex_unlock(&whc->mutex);

    return ret;
}

/*
 * Set the number of Device Notification Time Slots (DNTS) and enable
 * device notifications.
 */
int whc_set_num_dnts(struct wusbhc *wusbhc, u8 interval, u8 slots)
{
    struct whc *whc = wusbhc_to_whc(wusbhc);
    u32 dntsctrl;

    dntsctrl = WUSBDNTSCTRL_ACTIVE
        | WUSBDNTSCTRL_INTERVAL(interval)
        | WUSBDNTSCTRL_SLOTS(slots);

    le_writel(dntsctrl, whc->base + WUSBDNTSCTRL);

    return 0;
}

static int whc_set_key(struct whc *whc, u8 key_index, uint32_t tkid,
               const void *key, size_t key_size, bool is_gtk)
{
    uint32_t setkeycmd;
    uint32_t seckey[4];
    int i;
    int ret;

    memcpy(seckey, key, key_size);
    setkeycmd = WUSBSETSECKEYCMD_SET | WUSBSETSECKEYCMD_IDX(key_index);
    if (is_gtk)
        setkeycmd |= WUSBSETSECKEYCMD_GTK;

    le_writel(tkid, whc->base + WUSBTKID);
    for (i = 0; i < 4; i++)
        le_writel(seckey[i], whc->base + WUSBSECKEY + 4*i);
    le_writel(setkeycmd, whc->base + WUSBSETSECKEYCMD);

    ret = whci_wait_for(&whc->umc->dev, whc->base + WUSBSETSECKEYCMD,
                WUSBSETSECKEYCMD_SET, 0, 100, "set key");

    return ret;
}

int whc_set_ptk(struct wusbhc *wusbhc, u8 port_idx, u32 tkid,
        const void *ptk, size_t key_size)
{
    struct whc *whc = wusbhc_to_whc(wusbhc);
    struct di_buf_entry *di = &whc->di_buf[port_idx];
    int ret;

    mutex_lock(&whc->mutex);

    if (ptk) {
        ret = whc_set_key(whc, port_idx, tkid, ptk, key_size, false);
        if (ret)
            goto out;

        di->addr_sec_info &= ~WHC_DI_KEY_IDX_MASK;
        di->addr_sec_info |= WHC_DI_SECURE | WHC_DI_KEY_IDX(port_idx);
    } else
        di->addr_sec_info &= ~WHC_DI_SECURE;

    ret = whc_update_di(whc, port_idx);
out:
    mutex_unlock(&whc->mutex);
    return ret;
}

int whc_set_gtk(struct wusbhc *wusbhc, u32 tkid,
        const void *gtk, size_t key_size)
{
    struct whc *whc = wusbhc_to_whc(wusbhc);
    int ret;

    mutex_lock(&whc->mutex);

    ret = whc_set_key(whc, whc->n_devices, tkid, gtk, key_size, true);

    mutex_unlock(&whc->mutex);

    return ret;
}

int whc_set_cluster_id(struct whc *whc, u8 bcid)
{
    whc_write_wusbcmd(whc, WUSBCMD_BCID_MASK, WUSBCMD_BCID(bcid));
    return 0;
}