1/*
2 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
3 *
4 * This program is free software; you may redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
15 * SOFTWARE.
16 */
17
18#ifndef _VNIC_INTR_H_
19#define _VNIC_INTR_H_
20
21#include <linux/pci.h>
22#include "vnic_dev.h"
23
24#define VNIC_INTR_TIMER_MAX		0xffff
25
26#define VNIC_INTR_TIMER_TYPE_ABS	0
27#define VNIC_INTR_TIMER_TYPE_QUIET	1
28
29/* Interrupt control */
30struct vnic_intr_ctrl {
31	u32 coalescing_timer;		/* 0x00 */
32	u32 pad0;
33	u32 coalescing_value;		/* 0x08 */
34	u32 pad1;
35	u32 coalescing_type;		/* 0x10 */
36	u32 pad2;
37	u32 mask_on_assertion;		/* 0x18 */
38	u32 pad3;
39	u32 mask;			/* 0x20 */
40	u32 pad4;
41	u32 int_credits;		/* 0x28 */
42	u32 pad5;
43	u32 int_credit_return;		/* 0x30 */
44	u32 pad6;
45};
46
47struct vnic_intr {
48	unsigned int index;
49	struct vnic_dev *vdev;
50	struct vnic_intr_ctrl __iomem *ctrl;	/* memory-mapped */
51};
52
53static inline void
54svnic_intr_unmask(struct vnic_intr *intr)
55{
56	iowrite32(0, &intr->ctrl->mask);
57}
58
59static inline void
60svnic_intr_mask(struct vnic_intr *intr)
61{
62	iowrite32(1, &intr->ctrl->mask);
63}
64
65static inline void
66svnic_intr_return_credits(struct vnic_intr *intr,
67			  unsigned int credits,
68			  int unmask,
69			  int reset_timer)
70{
71#define VNIC_INTR_UNMASK_SHIFT		16
72#define VNIC_INTR_RESET_TIMER_SHIFT	17
73
74	u32 int_credit_return = (credits & 0xffff) |
75		(unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
76		(reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
77
78	iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
79}
80
81static inline unsigned int
82svnic_intr_credits(struct vnic_intr *intr)
83{
84	return ioread32(&intr->ctrl->int_credits);
85}
86
87static inline void
88svnic_intr_return_all_credits(struct vnic_intr *intr)
89{
90	unsigned int credits = svnic_intr_credits(intr);
91	int unmask = 1;
92	int reset_timer = 1;
93
94	svnic_intr_return_credits(intr, credits, unmask, reset_timer);
95}
96
97void svnic_intr_free(struct vnic_intr *);
98int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int);
99void svnic_intr_init(struct vnic_intr *intr,
100		     unsigned int coalescing_timer,
101		     unsigned int coalescing_type,
102		     unsigned int mask_on_assertion);
103void svnic_intr_clean(struct vnic_intr *);
104
105#endif /* _VNIC_INTR_H_ */
106