1 /* 2 * Copyright 2008 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 #ifndef _VNIC_INTR_H_ 19 #define _VNIC_INTR_H_ 20 21 #include <linux/pci.h> 22 #include "vnic_dev.h" 23 24 /* 25 * These defines avoid symbol clash between fnic and enic (Cisco 10G Eth 26 * Driver) when both are built with CONFIG options =y 27 */ 28 #define vnic_intr_unmask fnic_intr_unmask 29 #define vnic_intr_mask fnic_intr_mask 30 #define vnic_intr_return_credits fnic_intr_return_credits 31 #define vnic_intr_credits fnic_intr_credits 32 #define vnic_intr_return_all_credits fnic_intr_return_all_credits 33 #define vnic_intr_legacy_pba fnic_intr_legacy_pba 34 #define vnic_intr_free fnic_intr_free 35 #define vnic_intr_alloc fnic_intr_alloc 36 #define vnic_intr_init fnic_intr_init 37 #define vnic_intr_clean fnic_intr_clean 38 39 #define VNIC_INTR_TIMER_MAX 0xffff 40 41 #define VNIC_INTR_TIMER_TYPE_ABS 0 42 #define VNIC_INTR_TIMER_TYPE_QUIET 1 43 44 /* Interrupt control */ 45 struct vnic_intr_ctrl { 46 u32 coalescing_timer; /* 0x00 */ 47 u32 pad0; 48 u32 coalescing_value; /* 0x08 */ 49 u32 pad1; 50 u32 coalescing_type; /* 0x10 */ 51 u32 pad2; 52 u32 mask_on_assertion; /* 0x18 */ 53 u32 pad3; 54 u32 mask; /* 0x20 */ 55 u32 pad4; 56 u32 int_credits; /* 0x28 */ 57 u32 pad5; 58 u32 int_credit_return; /* 0x30 */ 59 u32 pad6; 60 }; 61 62 struct vnic_intr { 63 unsigned int index; 64 struct vnic_dev *vdev; 65 struct vnic_intr_ctrl __iomem *ctrl; /* memory-mapped */ 66 }; 67 68 static inline void vnic_intr_unmask(struct vnic_intr *intr) 69 { 70 iowrite32(0, &intr->ctrl->mask); 71 } 72 73 static inline void vnic_intr_mask(struct vnic_intr *intr) 74 { 75 iowrite32(1, &intr->ctrl->mask); 76 } 77 78 static inline void vnic_intr_return_credits(struct vnic_intr *intr, 79 unsigned int credits, int unmask, int reset_timer) 80 { 81 #define VNIC_INTR_UNMASK_SHIFT 16 82 #define VNIC_INTR_RESET_TIMER_SHIFT 17 83 84 u32 int_credit_return = (credits & 0xffff) | 85 (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) | 86 (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0); 87 88 iowrite32(int_credit_return, &intr->ctrl->int_credit_return); 89 } 90 91 static inline unsigned int vnic_intr_credits(struct vnic_intr *intr) 92 { 93 return ioread32(&intr->ctrl->int_credits); 94 } 95 96 static inline void vnic_intr_return_all_credits(struct vnic_intr *intr) 97 { 98 unsigned int credits = vnic_intr_credits(intr); 99 int unmask = 1; 100 int reset_timer = 1; 101 102 vnic_intr_return_credits(intr, credits, unmask, reset_timer); 103 } 104 105 static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba) 106 { 107 /* read PBA without clearing */ 108 return ioread32(legacy_pba); 109 } 110 111 void vnic_intr_free(struct vnic_intr *intr); 112 int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr, 113 unsigned int index); 114 void vnic_intr_init(struct vnic_intr *intr, unsigned int coalescing_timer, 115 unsigned int coalescing_type, unsigned int mask_on_assertion); 116 void vnic_intr_clean(struct vnic_intr *intr); 117 118 #endif /* _VNIC_INTR_H_ */ 119