drivers/scsi/fnic/vnic_intr.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
   4  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/errno.h>
   9 #include <linux/types.h>
  10 #include <linux/pci.h>
  11 #include <linux/delay.h>
  12 #include "vnic_dev.h"
  13 #include "vnic_intr.h"
  14
  15 void vnic_intr_free(struct vnic_intr *intr)
  16 {
  17         intr->ctrl = NULL;
  18 }
  19
  20 int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
  21         unsigned int index)
  22 {
  23         intr->index = index;
  24         intr->vdev = vdev;
  25
  26         intr->ctrl = vnic_dev_get_res(vdev, RES_TYPE_INTR_CTRL, index);
  27         if (!intr->ctrl) {
  28                 printk(KERN_ERR "Failed to hook INTR[%d].ctrl resource\n",
  29                         index);
  30                 return -EINVAL;
  31         }
  32
  33         return 0;
  34 }
  35
  36 void vnic_intr_init(struct vnic_intr *intr, unsigned int coalescing_timer,
  37         unsigned int coalescing_type, unsigned int mask_on_assertion)
  38 {
  39         iowrite32(coalescing_timer, &intr->ctrl->coalescing_timer);
  40         iowrite32(coalescing_type, &intr->ctrl->coalescing_type);
  41         iowrite32(mask_on_assertion, &intr->ctrl->mask_on_assertion);
  42         iowrite32(0, &intr->ctrl->int_credits);
  43 }
  44
  45 void vnic_intr_clean(struct vnic_intr *intr)
  46 {
  47         iowrite32(0, &intr->ctrl->int_credits);
  48 }