1 /*
2  * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
4  *
5  * This program is free software; you may redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; version 2 of the License.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
10  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
11  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
12  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
13  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
14  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
15  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
16  * SOFTWARE.
17  *
18  */
19 
20 #ifndef _VNIC_INTR_H_
21 #define _VNIC_INTR_H_
22 
23 #include <linux/pci.h>
24 
25 #include "vnic_dev.h"
26 
27 #define VNIC_INTR_TIMER_TYPE_ABS	0
28 #define VNIC_INTR_TIMER_TYPE_QUIET	1
29 
30 /* Interrupt control */
31 struct vnic_intr_ctrl {
32 	u32 coalescing_timer;		/* 0x00 */
33 	u32 pad0;
34 	u32 coalescing_value;		/* 0x08 */
35 	u32 pad1;
36 	u32 coalescing_type;		/* 0x10 */
37 	u32 pad2;
38 	u32 mask_on_assertion;		/* 0x18 */
39 	u32 pad3;
40 	u32 mask;			/* 0x20 */
41 	u32 pad4;
42 	u32 int_credits;		/* 0x28 */
43 	u32 pad5;
44 	u32 int_credit_return;		/* 0x30 */
45 	u32 pad6;
46 };
47 
48 struct vnic_intr {
49 	unsigned int index;
50 	struct vnic_dev *vdev;
51 	struct vnic_intr_ctrl __iomem *ctrl;		/* memory-mapped */
52 };
53 
54 static inline void vnic_intr_unmask(struct vnic_intr *intr)
55 {
56 	iowrite32(0, &intr->ctrl->mask);
57 }
58 
59 static inline void vnic_intr_mask(struct vnic_intr *intr)
60 {
61 	iowrite32(1, &intr->ctrl->mask);
62 }
63 
64 static inline int vnic_intr_masked(struct vnic_intr *intr)
65 {
66 	return ioread32(&intr->ctrl->mask);
67 }
68 
69 static inline void vnic_intr_return_credits(struct vnic_intr *intr,
70 	unsigned int credits, int unmask, int reset_timer)
71 {
72 #define VNIC_INTR_UNMASK_SHIFT		16
73 #define VNIC_INTR_RESET_TIMER_SHIFT	17
74 
75 	u32 int_credit_return = (credits & 0xffff) |
76 		(unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
77 		(reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
78 
79 	iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
80 }
81 
82 static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
83 {
84 	return ioread32(&intr->ctrl->int_credits);
85 }
86 
87 static inline void vnic_intr_return_all_credits(struct vnic_intr *intr)
88 {
89 	unsigned int credits = vnic_intr_credits(intr);
90 	int unmask = 1;
91 	int reset_timer = 1;
92 
93 	vnic_intr_return_credits(intr, credits, unmask, reset_timer);
94 }
95 
96 static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
97 {
98 	/* read PBA without clearing */
99 	return ioread32(legacy_pba);
100 }
101 
102 void vnic_intr_free(struct vnic_intr *intr);
103 int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
104 	unsigned int index);
105 void vnic_intr_init(struct vnic_intr *intr, u32 coalescing_timer,
106 	unsigned int coalescing_type, unsigned int mask_on_assertion);
107 void vnic_intr_coalescing_timer_set(struct vnic_intr *intr,
108 	u32 coalescing_timer);
109 void vnic_intr_clean(struct vnic_intr *intr);
110 
111 #endif /* _VNIC_INTR_H_ */
112