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 */
16 struct 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
33 struct vnic_intr {
34 unsigned int index;
35 struct vnic_dev *vdev;
36 struct vnic_intr_ctrl __iomem *ctrl; /* memory-mapped */
37 };
38
39 static inline void
svnic_intr_unmask(struct vnic_intr * intr)40 svnic_intr_unmask(struct vnic_intr *intr)
41 {
42 iowrite32(0, &intr->ctrl->mask);
43 }
44
45 static inline void
svnic_intr_mask(struct vnic_intr * intr)46 svnic_intr_mask(struct vnic_intr *intr)
47 {
48 iowrite32(1, &intr->ctrl->mask);
49 }
50
51 static inline void
svnic_intr_return_credits(struct vnic_intr * intr,unsigned int credits,int unmask,int reset_timer)52 svnic_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
67 static inline unsigned int
svnic_intr_credits(struct vnic_intr * intr)68 svnic_intr_credits(struct vnic_intr *intr)
69 {
70 return ioread32(&intr->ctrl->int_credits);
71 }
72
73 static inline void
svnic_intr_return_all_credits(struct vnic_intr * intr)74 svnic_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
83 void svnic_intr_free(struct vnic_intr *);
84 int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int);
85 void svnic_intr_init(struct vnic_intr *intr,
86 unsigned int coalescing_timer,
87 unsigned int coalescing_type,
88 unsigned int mask_on_assertion);
89 void svnic_intr_clean(struct vnic_intr *);
90
91 #endif /* _VNIC_INTR_H_ */
92