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 
30 void vnic_intr_free(struct vnic_intr *intr)
31 {
32 	intr->ctrl = NULL;
33 }
34 
35 int 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 
51 void 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 
60 void 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 
67 void vnic_intr_clean(struct vnic_intr *intr)
68 {
69 	iowrite32(0, &intr->ctrl->int_credits);
70 }
71