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

source code of linux/drivers/net/ethernet/cisco/enic/vnic_intr.h