drivers/scsi/snic/vnic_intr.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 // Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3
   4 #include <linux/kernel.h>
   5 #include <linux/errno.h>
   6 #include <linux/types.h>
   7 #include <linux/pci.h>
   8 #include <linux/delay.h>
   9 #include "vnic_dev.h"
  10 #include "vnic_intr.h"
  11
  12 void svnic_intr_free(struct vnic_intr *intr)
  13 {
  14         intr->ctrl = NULL;
  15 }
  16
  17 int svnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
  18         unsigned int index)
  19 {
  20         intr->index = index;
  21         intr->vdev = vdev;
  22
  23         intr->ctrl = svnic_dev_get_res(vdev, RES_TYPE_INTR_CTRL, index);
  24         if (!intr->ctrl) {
  25                 pr_err("Failed to hook INTR[%d].ctrl resource\n",
  26                         index);
  27                 return -EINVAL;
  28         }
  29
  30         return 0;
  31 }
  32
  33 void svnic_intr_init(struct vnic_intr *intr, unsigned int coalescing_timer,
  34         unsigned int coalescing_type, unsigned int mask_on_assertion)
  35 {
  36         iowrite32(coalescing_timer, &intr->ctrl->coalescing_timer);
  37         iowrite32(coalescing_type, &intr->ctrl->coalescing_type);
  38         iowrite32(mask_on_assertion, &intr->ctrl->mask_on_assertion);
  39         iowrite32(0, &intr->ctrl->int_credits);
  40 }
  41
  42 void svnic_intr_clean(struct vnic_intr *intr)
  43 {
  44         iowrite32(0, &intr->ctrl->int_credits);
  45 }