| Narsimhulu Musini | c8806b6 | 2015-05-29 01:04:01 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 Cisco Systems, Inc. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you may redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; version 2 of the License. |
| 7 | * |
| 8 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 9 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 10 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 11 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 12 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 13 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 14 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 15 | * SOFTWARE. |
| 16 | */ |
| 17 | |
| 18 | #ifndef _VNIC_INTR_H_ |
| 19 | #define _VNIC_INTR_H_ |
| 20 | |
| 21 | #include <linux/pci.h> |
| 22 | #include "vnic_dev.h" |
| 23 | |
| 24 | #define VNIC_INTR_TIMER_MAX 0xffff |
| 25 | |
| 26 | #define VNIC_INTR_TIMER_TYPE_ABS 0 |
| 27 | #define VNIC_INTR_TIMER_TYPE_QUIET 1 |
| 28 | |
| 29 | /* Interrupt control */ |
| 30 | struct vnic_intr_ctrl { |
| 31 | u32 coalescing_timer; /* 0x00 */ |
| 32 | u32 pad0; |
| 33 | u32 coalescing_value; /* 0x08 */ |
| 34 | u32 pad1; |
| 35 | u32 coalescing_type; /* 0x10 */ |
| 36 | u32 pad2; |
| 37 | u32 mask_on_assertion; /* 0x18 */ |
| 38 | u32 pad3; |
| 39 | u32 mask; /* 0x20 */ |
| 40 | u32 pad4; |
| 41 | u32 int_credits; /* 0x28 */ |
| 42 | u32 pad5; |
| 43 | u32 int_credit_return; /* 0x30 */ |
| 44 | u32 pad6; |
| 45 | }; |
| 46 | |
| 47 | struct vnic_intr { |
| 48 | unsigned int index; |
| 49 | struct vnic_dev *vdev; |
| 50 | struct vnic_intr_ctrl __iomem *ctrl; /* memory-mapped */ |
| 51 | }; |
| 52 | |
| 53 | static inline void |
| 54 | svnic_intr_unmask(struct vnic_intr *intr) |
| 55 | { |
| 56 | iowrite32(0, &intr->ctrl->mask); |
| 57 | } |
| 58 | |
| 59 | static inline void |
| 60 | svnic_intr_mask(struct vnic_intr *intr) |
| 61 | { |
| 62 | iowrite32(1, &intr->ctrl->mask); |
| 63 | } |
| 64 | |
| 65 | static inline void |
| 66 | svnic_intr_return_credits(struct vnic_intr *intr, |
| 67 | unsigned int credits, |
| 68 | int unmask, |
| 69 | int reset_timer) |
| 70 | { |
| 71 | #define VNIC_INTR_UNMASK_SHIFT 16 |
| 72 | #define VNIC_INTR_RESET_TIMER_SHIFT 17 |
| 73 | |
| 74 | u32 int_credit_return = (credits & 0xffff) | |
| 75 | (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) | |
| 76 | (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0); |
| 77 | |
| 78 | iowrite32(int_credit_return, &intr->ctrl->int_credit_return); |
| 79 | } |
| 80 | |
| 81 | static inline unsigned int |
| 82 | svnic_intr_credits(struct vnic_intr *intr) |
| 83 | { |
| 84 | return ioread32(&intr->ctrl->int_credits); |
| 85 | } |
| 86 | |
| 87 | static inline void |
| 88 | svnic_intr_return_all_credits(struct vnic_intr *intr) |
| 89 | { |
| 90 | unsigned int credits = svnic_intr_credits(intr); |
| 91 | int unmask = 1; |
| 92 | int reset_timer = 1; |
| 93 | |
| 94 | svnic_intr_return_credits(intr, credits, unmask, reset_timer); |
| 95 | } |
| 96 | |
| 97 | void svnic_intr_free(struct vnic_intr *); |
| 98 | int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int); |
| 99 | void svnic_intr_init(struct vnic_intr *intr, |
| 100 | unsigned int coalescing_timer, |
| 101 | unsigned int coalescing_type, |
| 102 | unsigned int mask_on_assertion); |
| 103 | void svnic_intr_clean(struct vnic_intr *); |
| 104 | |
| 105 | #endif /* _VNIC_INTR_H_ */ |