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 */
31struct 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
48struct vnic_intr {
49	unsigned int index;
50	struct vnic_dev *vdev;
51	struct vnic_intr_ctrl __iomem *ctrl;		/* memory-mapped */
52};
53
54static inline void vnic_intr_unmask(struct vnic_intr *intr)
55{
56	iowrite32(0, &intr->ctrl->mask);
57}
58
59static inline void vnic_intr_mask(struct vnic_intr *intr)
60{
61	iowrite32(1, &intr->ctrl->mask);
62}
63
64static inline int vnic_intr_masked(struct vnic_intr *intr)
65{
66	return ioread32(&intr->ctrl->mask);
67}
68
69static 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
82static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
83{
84	return ioread32(&intr->ctrl->int_credits);
85}
86
87static 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
96static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
97{
98	/* read PBA without clearing */
99	return ioread32(legacy_pba);
100}
101
102void vnic_intr_free(struct vnic_intr *intr);
103int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
104	unsigned int index);
105void vnic_intr_init(struct vnic_intr *intr, u32 coalescing_timer,
106	unsigned int coalescing_type, unsigned int mask_on_assertion);
107void vnic_intr_coalescing_timer_set(struct vnic_intr *intr,
108	u32 coalescing_timer);
109void vnic_intr_clean(struct vnic_intr *intr);
110
111#endif /* _VNIC_INTR_H_ */
112