1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright 2014 Cisco Systems, Inc. All rights reserved.
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * This program is free software; you may redistribute it and/or modify
5*4882a593Smuzhiyun * it under the terms of the GNU General Public License as published by
6*4882a593Smuzhiyun * the Free Software Foundation; version 2 of the License.
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9*4882a593Smuzhiyun * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10*4882a593Smuzhiyun * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11*4882a593Smuzhiyun * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12*4882a593Smuzhiyun * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13*4882a593Smuzhiyun * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14*4882a593Smuzhiyun * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
15*4882a593Smuzhiyun * SOFTWARE.
16*4882a593Smuzhiyun */
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #ifndef _VNIC_INTR_H_
19*4882a593Smuzhiyun #define _VNIC_INTR_H_
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #include <linux/pci.h>
22*4882a593Smuzhiyun #include "vnic_dev.h"
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun #define VNIC_INTR_TIMER_MAX 0xffff
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun #define VNIC_INTR_TIMER_TYPE_ABS 0
27*4882a593Smuzhiyun #define VNIC_INTR_TIMER_TYPE_QUIET 1
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun /* Interrupt control */
30*4882a593Smuzhiyun struct vnic_intr_ctrl {
31*4882a593Smuzhiyun u32 coalescing_timer; /* 0x00 */
32*4882a593Smuzhiyun u32 pad0;
33*4882a593Smuzhiyun u32 coalescing_value; /* 0x08 */
34*4882a593Smuzhiyun u32 pad1;
35*4882a593Smuzhiyun u32 coalescing_type; /* 0x10 */
36*4882a593Smuzhiyun u32 pad2;
37*4882a593Smuzhiyun u32 mask_on_assertion; /* 0x18 */
38*4882a593Smuzhiyun u32 pad3;
39*4882a593Smuzhiyun u32 mask; /* 0x20 */
40*4882a593Smuzhiyun u32 pad4;
41*4882a593Smuzhiyun u32 int_credits; /* 0x28 */
42*4882a593Smuzhiyun u32 pad5;
43*4882a593Smuzhiyun u32 int_credit_return; /* 0x30 */
44*4882a593Smuzhiyun u32 pad6;
45*4882a593Smuzhiyun };
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun struct vnic_intr {
48*4882a593Smuzhiyun unsigned int index;
49*4882a593Smuzhiyun struct vnic_dev *vdev;
50*4882a593Smuzhiyun struct vnic_intr_ctrl __iomem *ctrl; /* memory-mapped */
51*4882a593Smuzhiyun };
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun static inline void
svnic_intr_unmask(struct vnic_intr * intr)54*4882a593Smuzhiyun svnic_intr_unmask(struct vnic_intr *intr)
55*4882a593Smuzhiyun {
56*4882a593Smuzhiyun iowrite32(0, &intr->ctrl->mask);
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun static inline void
svnic_intr_mask(struct vnic_intr * intr)60*4882a593Smuzhiyun svnic_intr_mask(struct vnic_intr *intr)
61*4882a593Smuzhiyun {
62*4882a593Smuzhiyun iowrite32(1, &intr->ctrl->mask);
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun static inline void
svnic_intr_return_credits(struct vnic_intr * intr,unsigned int credits,int unmask,int reset_timer)66*4882a593Smuzhiyun svnic_intr_return_credits(struct vnic_intr *intr,
67*4882a593Smuzhiyun unsigned int credits,
68*4882a593Smuzhiyun int unmask,
69*4882a593Smuzhiyun int reset_timer)
70*4882a593Smuzhiyun {
71*4882a593Smuzhiyun #define VNIC_INTR_UNMASK_SHIFT 16
72*4882a593Smuzhiyun #define VNIC_INTR_RESET_TIMER_SHIFT 17
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun u32 int_credit_return = (credits & 0xffff) |
75*4882a593Smuzhiyun (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
76*4882a593Smuzhiyun (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun static inline unsigned int
svnic_intr_credits(struct vnic_intr * intr)82*4882a593Smuzhiyun svnic_intr_credits(struct vnic_intr *intr)
83*4882a593Smuzhiyun {
84*4882a593Smuzhiyun return ioread32(&intr->ctrl->int_credits);
85*4882a593Smuzhiyun }
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun static inline void
svnic_intr_return_all_credits(struct vnic_intr * intr)88*4882a593Smuzhiyun svnic_intr_return_all_credits(struct vnic_intr *intr)
89*4882a593Smuzhiyun {
90*4882a593Smuzhiyun unsigned int credits = svnic_intr_credits(intr);
91*4882a593Smuzhiyun int unmask = 1;
92*4882a593Smuzhiyun int reset_timer = 1;
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun svnic_intr_return_credits(intr, credits, unmask, reset_timer);
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun void svnic_intr_free(struct vnic_intr *);
98*4882a593Smuzhiyun int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int);
99*4882a593Smuzhiyun void svnic_intr_init(struct vnic_intr *intr,
100*4882a593Smuzhiyun unsigned int coalescing_timer,
101*4882a593Smuzhiyun unsigned int coalescing_type,
102*4882a593Smuzhiyun unsigned int mask_on_assertion);
103*4882a593Smuzhiyun void svnic_intr_clean(struct vnic_intr *);
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun #endif /* _VNIC_INTR_H_ */
106