LXR linux/drivers/scsi/snic/vnic

   1/*
   2 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3 *
   4 * This program is free software; you may redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; version 2 of the License.
   7 *
   8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15 * SOFTWARE.
  16 */
  17
  18#include <linux/kernel.h>
  19#include <linux/errno.h>
  20#include <linux/types.h>
  21#include <linux/pci.h>
  22#include <linux/delay.h>
  23#include "vnic_dev.h"
  24#include "vnic_intr.h"
  25
  26void svnic_intr_free(struct vnic_intr *intr)
  27{
  28        intr->ctrl = NULL;
  29}
  30
  31int svnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
  32        unsigned int index)
  33{
  34        intr->index = index;
  35        intr->vdev = vdev;
  36
  37        intr->ctrl = svnic_dev_get_res(vdev, RES_TYPE_INTR_CTRL, index);
  38        if (!intr->ctrl) {
  39                pr_err("Failed to hook INTR[%d].ctrl resource\n",
  40                        index);
  41                return -EINVAL;
  42        }
  43
  44        return 0;
  45}
  46
  47void svnic_intr_init(struct vnic_intr *intr, unsigned int coalescing_timer,
  48        unsigned int coalescing_type, unsigned int mask_on_assertion)
  49{
  50        iowrite32(coalescing_timer, &intr->ctrl->coalescing_timer);
  51        iowrite32(coalescing_type, &intr->ctrl->coalescing_type);
  52        iowrite32(mask_on_assertion, &intr->ctrl->mask_on_assertion);
  53        iowrite32(0, &intr->ctrl->int_credits);
  54}
  55
  56void svnic_intr_clean(struct vnic_intr *intr)
  57{
  58        iowrite32(0, &intr->ctrl->int_credits);
  59}
  60