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_ */ 106