2 * Copyright 2008 Cisco Systems, Inc. All rights reserved.
3 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
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.
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
23 #include <linux/pci.h>
27 #define VNIC_INTR_TIMER_MAX 0xffff
29 #define VNIC_INTR_TIMER_TYPE_ABS 0
30 #define VNIC_INTR_TIMER_TYPE_QUIET 1
32 /* Interrupt control */
33 struct vnic_intr_ctrl {
34 u32 coalescing_timer; /* 0x00 */
36 u32 coalescing_value; /* 0x08 */
38 u32 coalescing_type; /* 0x10 */
40 u32 mask_on_assertion; /* 0x18 */
44 u32 int_credits; /* 0x28 */
46 u32 int_credit_return; /* 0x30 */
52 struct vnic_dev *vdev;
53 struct vnic_intr_ctrl __iomem *ctrl; /* memory-mapped */
56 static inline void vnic_intr_unmask(struct vnic_intr *intr)
58 iowrite32(0, &intr->ctrl->mask);
61 static inline void vnic_intr_mask(struct vnic_intr *intr)
63 iowrite32(1, &intr->ctrl->mask);
66 static inline void vnic_intr_return_credits(struct vnic_intr *intr,
67 unsigned int credits, int unmask, int reset_timer)
69 #define VNIC_INTR_UNMASK_SHIFT 16
70 #define VNIC_INTR_RESET_TIMER_SHIFT 17
72 u32 int_credit_return = (credits & 0xffff) |
73 (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
74 (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
76 iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
79 static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
81 return ioread32(&intr->ctrl->int_credits);
84 static inline void vnic_intr_return_all_credits(struct vnic_intr *intr)
86 unsigned int credits = vnic_intr_credits(intr);
90 vnic_intr_return_credits(intr, credits, unmask, reset_timer);
93 static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
95 /* read PBA without clearing */
96 return ioread32(legacy_pba);
99 void vnic_intr_free(struct vnic_intr *intr);
100 int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
102 void vnic_intr_init(struct vnic_intr *intr, unsigned int coalescing_timer,
103 unsigned int coalescing_type, unsigned int mask_on_assertion);
104 void vnic_intr_clean(struct vnic_intr *intr);
106 #endif /* _VNIC_INTR_H_ */