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vnic_intr.h
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1 /*
2  * Copyright 2008 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 #ifndef _VNIC_INTR_H_
19 #define _VNIC_INTR_H_
20 
21 #include <linux/pci.h>
22 #include "vnic_dev.h"
23 
24 /*
25  * These defines avoid symbol clash between fnic and enic (Cisco 10G Eth
26  * Driver) when both are built with CONFIG options =y
27  */
28 #define vnic_intr_unmask fnic_intr_unmask
29 #define vnic_intr_mask fnic_intr_mask
30 #define vnic_intr_return_credits fnic_intr_return_credits
31 #define vnic_intr_credits fnic_intr_credits
32 #define vnic_intr_return_all_credits fnic_intr_return_all_credits
33 #define vnic_intr_legacy_pba fnic_intr_legacy_pba
34 #define vnic_intr_free fnic_intr_free
35 #define vnic_intr_alloc fnic_intr_alloc
36 #define vnic_intr_init fnic_intr_init
37 #define vnic_intr_clean fnic_intr_clean
38 
39 #define VNIC_INTR_TIMER_MAX 0xffff
40 
41 #define VNIC_INTR_TIMER_TYPE_ABS 0
42 #define VNIC_INTR_TIMER_TYPE_QUIET 1
43 
44 /* Interrupt control */
45 struct vnic_intr_ctrl {
46  u32 coalescing_timer; /* 0x00 */
47  u32 pad0;
48  u32 coalescing_value; /* 0x08 */
49  u32 pad1;
50  u32 coalescing_type; /* 0x10 */
51  u32 pad2;
52  u32 mask_on_assertion; /* 0x18 */
53  u32 pad3;
54  u32 mask; /* 0x20 */
55  u32 pad4;
56  u32 int_credits; /* 0x28 */
57  u32 pad5;
58  u32 int_credit_return; /* 0x30 */
59  u32 pad6;
60 };
61 
62 struct vnic_intr {
63  unsigned int index;
64  struct vnic_dev *vdev;
65  struct vnic_intr_ctrl __iomem *ctrl; /* memory-mapped */
66 };
67 
68 static inline void vnic_intr_unmask(struct vnic_intr *intr)
69 {
70  iowrite32(0, &intr->ctrl->mask);
71 }
72 
73 static inline void vnic_intr_mask(struct vnic_intr *intr)
74 {
75  iowrite32(1, &intr->ctrl->mask);
76 }
77 
78 static inline void vnic_intr_return_credits(struct vnic_intr *intr,
79  unsigned int credits, int unmask, int reset_timer)
80 {
81 #define VNIC_INTR_UNMASK_SHIFT 16
82 #define VNIC_INTR_RESET_TIMER_SHIFT 17
83 
84  u32 int_credit_return = (credits & 0xffff) |
85  (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
86  (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
87 
88  iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
89 }
90 
91 static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
92 {
93  return ioread32(&intr->ctrl->int_credits);
94 }
95 
96 static inline void vnic_intr_return_all_credits(struct vnic_intr *intr)
97 {
98  unsigned int credits = vnic_intr_credits(intr);
99  int unmask = 1;
100  int reset_timer = 1;
101 
102  vnic_intr_return_credits(intr, credits, unmask, reset_timer);
103 }
104 
105 static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
106 {
107  /* read PBA without clearing */
108  return ioread32(legacy_pba);
109 }
110 
111 void vnic_intr_free(struct vnic_intr *intr);
112 int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
113  unsigned int index);
114 void vnic_intr_init(struct vnic_intr *intr, unsigned int coalescing_timer,
115  unsigned int coalescing_type, unsigned int mask_on_assertion);
116 void vnic_intr_clean(struct vnic_intr *intr);
117 
118 #endif /* _VNIC_INTR_H_ */