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 */
18 struct 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 
35 struct vnic_intr {
36 	unsigned int index;
37 	struct vnic_dev *vdev;
38 	struct vnic_intr_ctrl __iomem *ctrl;		/* memory-mapped */
39 };
40 
41 static inline void vnic_intr_unmask(struct vnic_intr *intr)
42 {
43 	iowrite32(0, &intr->ctrl->mask);
44 }
45 
46 static inline void vnic_intr_mask(struct vnic_intr *intr)
47 {
48 	iowrite32(1, &intr->ctrl->mask);
49 }
50 
51 static inline int vnic_intr_masked(struct vnic_intr *intr)
52 {
53 	return ioread32(&intr->ctrl->mask);
54 }
55 
56 static 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 
69 static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
70 {
71 	return ioread32(&intr->ctrl->int_credits);
72 }
73 
74 static 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 
83 static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
84 {
85 	/* read PBA without clearing */
86 	return ioread32(legacy_pba);
87 }
88 
89 void vnic_intr_free(struct vnic_intr *intr);
90 int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
91 	unsigned int index);
92 void vnic_intr_init(struct vnic_intr *intr, u32 coalescing_timer,
93 	unsigned int coalescing_type, unsigned int mask_on_assertion);
94 void vnic_intr_coalescing_timer_set(struct vnic_intr *intr,
95 	u32 coalescing_timer);
96 void vnic_intr_clean(struct vnic_intr *intr);
97 
98 #endif /* _VNIC_INTR_H_ */
99