1/* SPDX-License-Identifier: GPL-2.0-only */
2/* Copyright 2014 Cisco Systems, Inc.  All rights reserved. */
3
4#ifndef _VNIC_INTR_H_
5#define _VNIC_INTR_H_
6
7#include <linux/pci.h>
8#include "vnic_dev.h"
9
10#define VNIC_INTR_TIMER_MAX		0xffff
11
12#define VNIC_INTR_TIMER_TYPE_ABS	0
13#define VNIC_INTR_TIMER_TYPE_QUIET	1
14
15/* Interrupt control */
16struct vnic_intr_ctrl {
17	u32 coalescing_timer;		/* 0x00 */
18	u32 pad0;
19	u32 coalescing_value;		/* 0x08 */
20	u32 pad1;
21	u32 coalescing_type;		/* 0x10 */
22	u32 pad2;
23	u32 mask_on_assertion;		/* 0x18 */
24	u32 pad3;
25	u32 mask;			/* 0x20 */
26	u32 pad4;
27	u32 int_credits;		/* 0x28 */
28	u32 pad5;
29	u32 int_credit_return;		/* 0x30 */
30	u32 pad6;
31};
32
33struct vnic_intr {
34	unsigned int index;
35	struct vnic_dev *vdev;
36	struct vnic_intr_ctrl __iomem *ctrl;	/* memory-mapped */
37};
38
39static inline void
40svnic_intr_unmask(struct vnic_intr *intr)
41{
42	iowrite32(0, &intr->ctrl->mask);
43}
44
45static inline void
46svnic_intr_mask(struct vnic_intr *intr)
47{
48	iowrite32(1, &intr->ctrl->mask);
49}
50
51static inline void
52svnic_intr_return_credits(struct vnic_intr *intr,
53			  unsigned int credits,
54			  int unmask,
55			  int reset_timer)
56{
57#define VNIC_INTR_UNMASK_SHIFT		16
58#define VNIC_INTR_RESET_TIMER_SHIFT	17
59
60	u32 int_credit_return = (credits & 0xffff) |
61		(unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
62		(reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
63
64	iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
65}
66
67static inline unsigned int
68svnic_intr_credits(struct vnic_intr *intr)
69{
70	return ioread32(&intr->ctrl->int_credits);
71}
72
73static inline void
74svnic_intr_return_all_credits(struct vnic_intr *intr)
75{
76	unsigned int credits = svnic_intr_credits(intr);
77	int unmask = 1;
78	int reset_timer = 1;
79
80	svnic_intr_return_credits(intr, credits, unmask, reset_timer);
81}
82
83void svnic_intr_free(struct vnic_intr *);
84int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int);
85void svnic_intr_init(struct vnic_intr *intr,
86		     unsigned int coalescing_timer,
87		     unsigned int coalescing_type,
88		     unsigned int mask_on_assertion);
89void svnic_intr_clean(struct vnic_intr *);
90
91#endif /* _VNIC_INTR_H_ */
92