1 /*
2 * Copyright 2014 Cisco Systems, Inc. All rights reserved.
3 *
4 * This program is free software; you may redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
15 * SOFTWARE.
16 */
17
18 #ifndef _VNIC_INTR_H_
19 #define _VNIC_INTR_H_
20
21 #include <linux/pci.h>
22 #include "vnic_dev.h"
23
24 #define VNIC_INTR_TIMER_MAX 0xffff
25
26 #define VNIC_INTR_TIMER_TYPE_ABS 0
27 #define VNIC_INTR_TIMER_TYPE_QUIET 1
28
29 /* Interrupt control */
30 struct vnic_intr_ctrl {
31 u32 coalescing_timer; /* 0x00 */
32 u32 pad0;
33 u32 coalescing_value; /* 0x08 */
34 u32 pad1;
35 u32 coalescing_type; /* 0x10 */
36 u32 pad2;
37 u32 mask_on_assertion; /* 0x18 */
38 u32 pad3;
39 u32 mask; /* 0x20 */
40 u32 pad4;
41 u32 int_credits; /* 0x28 */
42 u32 pad5;
43 u32 int_credit_return; /* 0x30 */
44 u32 pad6;
45 };
46
47 struct vnic_intr {
48 unsigned int index;
49 struct vnic_dev *vdev;
50 struct vnic_intr_ctrl __iomem *ctrl; /* memory-mapped */
51 };
52
53 static inline void
svnic_intr_unmask(struct vnic_intr * intr)54 svnic_intr_unmask(struct vnic_intr *intr)
55 {
56 iowrite32(0, &intr->ctrl->mask);
57 }
58
59 static inline void
svnic_intr_mask(struct vnic_intr * intr)60 svnic_intr_mask(struct vnic_intr *intr)
61 {
62 iowrite32(1, &intr->ctrl->mask);
63 }
64
65 static inline void
svnic_intr_return_credits(struct vnic_intr * intr,unsigned int credits,int unmask,int reset_timer)66 svnic_intr_return_credits(struct vnic_intr *intr,
67 unsigned int credits,
68 int unmask,
69 int reset_timer)
70 {
71 #define VNIC_INTR_UNMASK_SHIFT 16
72 #define VNIC_INTR_RESET_TIMER_SHIFT 17
73
74 u32 int_credit_return = (credits & 0xffff) |
75 (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
76 (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
77
78 iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
79 }
80
81 static inline unsigned int
svnic_intr_credits(struct vnic_intr * intr)82 svnic_intr_credits(struct vnic_intr *intr)
83 {
84 return ioread32(&intr->ctrl->int_credits);
85 }
86
87 static inline void
svnic_intr_return_all_credits(struct vnic_intr * intr)88 svnic_intr_return_all_credits(struct vnic_intr *intr)
89 {
90 unsigned int credits = svnic_intr_credits(intr);
91 int unmask = 1;
92 int reset_timer = 1;
93
94 svnic_intr_return_credits(intr, credits, unmask, reset_timer);
95 }
96
97 void svnic_intr_free(struct vnic_intr *);
98 int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int);
99 void svnic_intr_init(struct vnic_intr *intr,
100 unsigned int coalescing_timer,
101 unsigned int coalescing_type,
102 unsigned int mask_on_assertion);
103 void svnic_intr_clean(struct vnic_intr *);
104
105 #endif /* _VNIC_INTR_H_ */
106