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