1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
4 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
5 */
6
7#ifndef _VNIC_INTR_H_
8#define _VNIC_INTR_H_
9
10#include <linux/pci.h>
11
12#include "vnic_dev.h"
13
14#define VNIC_INTR_TIMER_TYPE_ABS	0
15#define VNIC_INTR_TIMER_TYPE_QUIET	1
16
17/* Interrupt control */
18struct vnic_intr_ctrl {
19	u32 coalescing_timer;		/* 0x00 */
20	u32 pad0;
21	u32 coalescing_value;		/* 0x08 */
22	u32 pad1;
23	u32 coalescing_type;		/* 0x10 */
24	u32 pad2;
25	u32 mask_on_assertion;		/* 0x18 */
26	u32 pad3;
27	u32 mask;			/* 0x20 */
28	u32 pad4;
29	u32 int_credits;		/* 0x28 */
30	u32 pad5;
31	u32 int_credit_return;		/* 0x30 */
32	u32 pad6;
33};
34
35struct vnic_intr {
36	unsigned int index;
37	struct vnic_dev *vdev;
38	struct vnic_intr_ctrl __iomem *ctrl;		/* memory-mapped */
39};
40
41static inline void vnic_intr_unmask(struct vnic_intr *intr)
42{
43	iowrite32(0, &intr->ctrl->mask);
44}
45
46static inline void vnic_intr_mask(struct vnic_intr *intr)
47{
48	iowrite32(1, &intr->ctrl->mask);
49}
50
51static inline int vnic_intr_masked(struct vnic_intr *intr)
52{
53	return ioread32(&intr->ctrl->mask);
54}
55
56static inline void vnic_intr_return_credits(struct vnic_intr *intr,
57	unsigned int credits, int unmask, int reset_timer)
58{
59#define VNIC_INTR_UNMASK_SHIFT		16
60#define VNIC_INTR_RESET_TIMER_SHIFT	17
61
62	u32 int_credit_return = (credits & 0xffff) |
63		(unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
64		(reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
65
66	iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
67}
68
69static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
70{
71	return ioread32(&intr->ctrl->int_credits);
72}
73
74static inline void vnic_intr_return_all_credits(struct vnic_intr *intr)
75{
76	unsigned int credits = vnic_intr_credits(intr);
77	int unmask = 1;
78	int reset_timer = 1;
79
80	vnic_intr_return_credits(intr, credits, unmask, reset_timer);
81}
82
83static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
84{
85	/* read PBA without clearing */
86	return ioread32(legacy_pba);
87}
88
89void vnic_intr_free(struct vnic_intr *intr);
90int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
91	unsigned int index);
92void vnic_intr_init(struct vnic_intr *intr, u32 coalescing_timer,
93	unsigned int coalescing_type, unsigned int mask_on_assertion);
94void vnic_intr_coalescing_timer_set(struct vnic_intr *intr,
95	u32 coalescing_timer);
96void vnic_intr_clean(struct vnic_intr *intr);
97
98#endif /* _VNIC_INTR_H_ */
99