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
vnic_intr_unmask(struct vnic_intr * intr)54 static inline void vnic_intr_unmask(struct vnic_intr *intr)
55 {
56 iowrite32(0, &intr->ctrl->mask);
57 }
58
vnic_intr_mask(struct vnic_intr * intr)59 static inline void vnic_intr_mask(struct vnic_intr *intr)
60 {
61 iowrite32(1, &intr->ctrl->mask);
62 }
63
vnic_intr_masked(struct vnic_intr * intr)64 static inline int vnic_intr_masked(struct vnic_intr *intr)
65 {
66 return ioread32(&intr->ctrl->mask);
67 }
68
vnic_intr_return_credits(struct vnic_intr * intr,unsigned int credits,int unmask,int reset_timer)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
vnic_intr_credits(struct vnic_intr * intr)82 static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
83 {
84 return ioread32(&intr->ctrl->int_credits);
85 }
86
vnic_intr_return_all_credits(struct vnic_intr * intr)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
vnic_intr_legacy_pba(u32 __iomem * legacy_pba)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