hw.c

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/*
 * Wireless Host Controller (WHC) hardware access helpers.
 *
 * 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/dma-mapping.h>
#include <linux/uwb/umc.h>

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

#include "whcd.h"

void whc_write_wusbcmd(struct whc *whc, u32 mask, u32 val)
{
    unsigned long flags;
    u32 cmd;

    spin_lock_irqsave(&whc->lock, flags);

    cmd = le_readl(whc->base + WUSBCMD);
    cmd = (cmd & ~mask) | val;
    le_writel(cmd, whc->base + WUSBCMD);

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

int whc_do_gencmd(struct whc *whc, u32 cmd, u32 params, void *addr, size_t len)
{
    unsigned long flags;
    dma_addr_t dma_addr;
    int t;
    int ret = 0;

    mutex_lock(&whc->mutex);

    /* Wait for previous command to complete. */
    t = wait_event_timeout(whc->cmd_wq,
                   (le_readl(whc->base + WUSBGENCMDSTS) & WUSBGENCMDSTS_ACTIVE) == 0,
                   WHC_GENCMD_TIMEOUT_MS);
    if (t == 0) {
        dev_err(&whc->umc->dev, "generic command timeout (%04x/%04x)\n",
            le_readl(whc->base + WUSBGENCMDSTS),
            le_readl(whc->base + WUSBGENCMDPARAMS));
        ret = -ETIMEDOUT;
        goto out;
    }

    if (addr) {
        memcpy(whc->gen_cmd_buf, addr, len);
        dma_addr = whc->gen_cmd_buf_dma;
    } else
        dma_addr = 0;

    /* Poke registers to start cmd. */
    spin_lock_irqsave(&whc->lock, flags);

    le_writel(params, whc->base + WUSBGENCMDPARAMS);
    le_writeq(dma_addr, whc->base + WUSBGENADDR);

    le_writel(WUSBGENCMDSTS_ACTIVE | WUSBGENCMDSTS_IOC | cmd,
          whc->base + WUSBGENCMDSTS);

    spin_unlock_irqrestore(&whc->lock, flags);
out:
    mutex_unlock(&whc->mutex);

    return ret;
}

void whc_hw_error(struct whc *whc, const char *reason)
{
    struct wusbhc *wusbhc = &whc->wusbhc;

    dev_err(&whc->umc->dev, "hardware error: %s\n", reason);
    wusbhc_reset_all(wusbhc);
}