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Abhijeet Joglekar5df6d732009-04-17 18:33:26 -07001/*
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 */
45struct 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
62struct vnic_intr {
63 unsigned int index;
64 struct vnic_dev *vdev;
65 struct vnic_intr_ctrl __iomem *ctrl; /* memory-mapped */
66};
67
68static inline void vnic_intr_unmask(struct vnic_intr *intr)
69{
70 iowrite32(0, &intr->ctrl->mask);
71}
72
73static inline void vnic_intr_mask(struct vnic_intr *intr)
74{
75 iowrite32(1, &intr->ctrl->mask);
76}
77
78static 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
91static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
92{
93 return ioread32(&intr->ctrl->int_credits);
94}
95
96static 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
105static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
106{
107 /* read PBA without clearing */
108 return ioread32(legacy_pba);
109}
110
111void vnic_intr_free(struct vnic_intr *intr);
112int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
113 unsigned int index);
114void vnic_intr_init(struct vnic_intr *intr, unsigned int coalescing_timer,
115 unsigned int coalescing_type, unsigned int mask_on_assertion);
116void vnic_intr_clean(struct vnic_intr *intr);
117
118#endif /* _VNIC_INTR_H_ */