scsi/snic/vnic_intr.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 // Copyright 2014 Cisco Systems, Inc.  All rights reserved.
0003
0004 #include <linux/kernel.h>
0005 #include <linux/errno.h>
0006 #include <linux/types.h>
0007 #include <linux/pci.h>
0008 #include <linux/delay.h>
0009 #include "vnic_dev.h"
0010 #include "vnic_intr.h"
0011
0012 void svnic_intr_free(struct vnic_intr *intr)
0013 {
0014     intr->ctrl = NULL;
0015 }
0016
0017 int svnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
0018     unsigned int index)
0019 {
0020     intr->index = index;
0021     intr->vdev = vdev;
0022
0023     intr->ctrl = svnic_dev_get_res(vdev, RES_TYPE_INTR_CTRL, index);
0024     if (!intr->ctrl) {
0025         pr_err("Failed to hook INTR[%d].ctrl resource\n",
0026             index);
0027         return -EINVAL;
0028     }
0029
0030     return 0;
0031 }
0032
0033 void svnic_intr_init(struct vnic_intr *intr, unsigned int coalescing_timer,
0034     unsigned int coalescing_type, unsigned int mask_on_assertion)
0035 {
0036     iowrite32(coalescing_timer, &intr->ctrl->coalescing_timer);
0037     iowrite32(coalescing_type, &intr->ctrl->coalescing_type);
0038     iowrite32(mask_on_assertion, &intr->ctrl->mask_on_assertion);
0039     iowrite32(0, &intr->ctrl->int_credits);
0040 }
0041
0042 void svnic_intr_clean(struct vnic_intr *intr)
0043 {
0044     iowrite32(0, &intr->ctrl->int_credits);
0045 }