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