vnic_wq_copy.c

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/*
 * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may 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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include "vnic_wq_copy.h"

void vnic_wq_copy_enable(struct vnic_wq_copy *wq)
{
    iowrite32(1, &wq->ctrl->enable);
}

int vnic_wq_copy_disable(struct vnic_wq_copy *wq)
{
    unsigned int wait;

    iowrite32(0, &wq->ctrl->enable);

    /* Wait for HW to ACK disable request */
    for (wait = 0; wait < 100; wait++) {
        if (!(ioread32(&wq->ctrl->running)))
            return 0;
        udelay(1);
    }

    printk(KERN_ERR "Failed to disable Copy WQ[%d],"
           " fetch index=%d, posted_index=%d\n",
           wq->index, ioread32(&wq->ctrl->fetch_index),
           ioread32(&wq->ctrl->posted_index));

    return -ENODEV;
}

void vnic_wq_copy_clean(struct vnic_wq_copy *wq,
    void (*q_clean)(struct vnic_wq_copy *wq,
    struct fcpio_host_req *wq_desc))
{
    BUG_ON(ioread32(&wq->ctrl->enable));

    if (vnic_wq_copy_desc_in_use(wq))
        vnic_wq_copy_service(wq, -1, q_clean);

    wq->to_use_index = wq->to_clean_index = 0;

    iowrite32(0, &wq->ctrl->fetch_index);
    iowrite32(0, &wq->ctrl->posted_index);
    iowrite32(0, &wq->ctrl->error_status);

    vnic_dev_clear_desc_ring(&wq->ring);
}

void vnic_wq_copy_free(struct vnic_wq_copy *wq)
{
    struct vnic_dev *vdev;

    vdev = wq->vdev;
    vnic_dev_free_desc_ring(vdev, &wq->ring);
    wq->ctrl = NULL;
}

int vnic_wq_copy_alloc(struct vnic_dev *vdev, struct vnic_wq_copy *wq,
               unsigned int index, unsigned int desc_count,
               unsigned int desc_size)
{
    int err;

    wq->index = index;
    wq->vdev = vdev;
    wq->to_use_index = wq->to_clean_index = 0;
    wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
    if (!wq->ctrl) {
        printk(KERN_ERR "Failed to hook COPY WQ[%d] resource\n", index);
        return -EINVAL;
    }

    vnic_wq_copy_disable(wq);

    err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
    if (err)
        return err;

    return 0;
}

void vnic_wq_copy_init(struct vnic_wq_copy *wq, unsigned int cq_index,
    unsigned int error_interrupt_enable,
    unsigned int error_interrupt_offset)
{
    u64 paddr;

    paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
    writeq(paddr, &wq->ctrl->ring_base);
    iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
    iowrite32(0, &wq->ctrl->fetch_index);
    iowrite32(0, &wq->ctrl->posted_index);
    iowrite32(cq_index, &wq->ctrl->cq_index);
    iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
    iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
}