drivers/scsi/snic/vnic_intr.c

   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
  26 void svnic_intr_free(struct vnic_intr *intr)
  27 {
  28         intr->ctrl = NULL;
  29 }
  30
  31 int 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
  47 void 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
  56 void svnic_intr_clean(struct vnic_intr *intr)
  57 {
  58         iowrite32(0, &intr->ctrl->int_credits);
  59 }