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/drivers/net/ethernet/cisco/enic/vnic_intr.c

http://github.com/mirrors/linux
C | 70 lines | 43 code | 9 blank | 18 comment | 1 complexity | 4fd17bd89d01df394d52020233606a28 MD5 | raw file
 1/*
 2 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
 3 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 4 *
 5 * This program is free software; you may redistribute it and/or modify
 6 * it under the terms of the GNU General Public License as published by
 7 * the Free Software Foundation; version 2 of the License.
 8 *
 9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
16 * SOFTWARE.
17 *
18 */
19
20#include <linux/kernel.h>
21#include <linux/errno.h>
22#include <linux/types.h>
23#include <linux/pci.h>
24#include <linux/delay.h>
25
26#include "vnic_dev.h"
27#include "vnic_intr.h"
28#include "enic.h"
29
30void vnic_intr_free(struct vnic_intr *intr)
31{
32	intr->ctrl = NULL;
33}
34
35int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
36	unsigned int index)
37{
38	intr->index = index;
39	intr->vdev = vdev;
40
41	intr->ctrl = vnic_dev_get_res(vdev, RES_TYPE_INTR_CTRL, index);
42	if (!intr->ctrl) {
43		vdev_err(vdev, "Failed to hook INTR[%d].ctrl resource\n",
44			 index);
45		return -EINVAL;
46	}
47
48	return 0;
49}
50
51void vnic_intr_init(struct vnic_intr *intr, u32 coalescing_timer,
52	unsigned int coalescing_type, unsigned int mask_on_assertion)
53{
54	vnic_intr_coalescing_timer_set(intr, coalescing_timer);
55	iowrite32(coalescing_type, &intr->ctrl->coalescing_type);
56	iowrite32(mask_on_assertion, &intr->ctrl->mask_on_assertion);
57	iowrite32(0, &intr->ctrl->int_credits);
58}
59
60void vnic_intr_coalescing_timer_set(struct vnic_intr *intr,
61	u32 coalescing_timer)
62{
63	iowrite32(vnic_dev_intr_coal_timer_usec_to_hw(intr->vdev,
64		coalescing_timer), &intr->ctrl->coalescing_timer);
65}
66
67void vnic_intr_clean(struct vnic_intr *intr)
68{
69	iowrite32(0, &intr->ctrl->int_credits);
70}