scsi/fnic/vnic_intr.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
0004  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
0005  */
0006
0007 #include <linux/kernel.h>
0008 #include <linux/errno.h>
0009 #include <linux/types.h>
0010 #include <linux/pci.h>
0011 #include <linux/delay.h>
0012 #include "vnic_dev.h"
0013 #include "vnic_intr.h"
0014
0015 void vnic_intr_free(struct vnic_intr *intr)
0016 {
0017     intr->ctrl = NULL;
0018 }
0019
0020 int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
0021     unsigned int index)
0022 {
0023     intr->index = index;
0024     intr->vdev = vdev;
0025
0026     intr->ctrl = vnic_dev_get_res(vdev, RES_TYPE_INTR_CTRL, index);
0027     if (!intr->ctrl) {
0028         printk(KERN_ERR "Failed to hook INTR[%d].ctrl resource\n",
0029             index);
0030         return -EINVAL;
0031     }
0032
0033     return 0;
0034 }
0035
0036 void vnic_intr_init(struct vnic_intr *intr, unsigned int coalescing_timer,
0037     unsigned int coalescing_type, unsigned int mask_on_assertion)
0038 {
0039     iowrite32(coalescing_timer, &intr->ctrl->coalescing_timer);
0040     iowrite32(coalescing_type, &intr->ctrl->coalescing_type);
0041     iowrite32(mask_on_assertion, &intr->ctrl->mask_on_assertion);
0042     iowrite32(0, &intr->ctrl->int_credits);
0043 }
0044
0045 void vnic_intr_clean(struct vnic_intr *intr)
0046 {
0047     iowrite32(0, &intr->ctrl->int_credits);
0048 }