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 #include <linux/kernel.h>
21 #include <linux/errno.h>
22 #include <linux/types.h>
23 #include <linux/pci.h>
24 
25 #include "vnic_dev.h"
26 #include "vnic_cq.h"
27 #include "enic.h"
28 
29 void vnic_cq_free(struct vnic_cq *cq)
30 {
31 	vnic_dev_free_desc_ring(cq->vdev, &cq->ring);
32 
33 	cq->ctrl = NULL;
34 }
35 
36 int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
37 	unsigned int desc_count, unsigned int desc_size)
38 {
39 	cq->index = index;
40 	cq->vdev = vdev;
41 
42 	cq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_CQ, index);
43 	if (!cq->ctrl) {
44 		vdev_err(vdev, "Failed to hook CQ[%d] resource\n", index);
45 		return -EINVAL;
46 	}
47 
48 	return vnic_dev_alloc_desc_ring(vdev, &cq->ring, desc_count, desc_size);
49 }
50 
51 void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
52 	unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
53 	unsigned int cq_tail_color, unsigned int interrupt_enable,
54 	unsigned int cq_entry_enable, unsigned int cq_message_enable,
55 	unsigned int interrupt_offset, u64 cq_message_addr)
56 {
57 	u64 paddr;
58 
59 	paddr = (u64)cq->ring.base_addr | VNIC_PADDR_TARGET;
60 	writeq(paddr, &cq->ctrl->ring_base);
61 	iowrite32(cq->ring.desc_count, &cq->ctrl->ring_size);
62 	iowrite32(flow_control_enable, &cq->ctrl->flow_control_enable);
63 	iowrite32(color_enable, &cq->ctrl->color_enable);
64 	iowrite32(cq_head, &cq->ctrl->cq_head);
65 	iowrite32(cq_tail, &cq->ctrl->cq_tail);
66 	iowrite32(cq_tail_color, &cq->ctrl->cq_tail_color);
67 	iowrite32(interrupt_enable, &cq->ctrl->interrupt_enable);
68 	iowrite32(cq_entry_enable, &cq->ctrl->cq_entry_enable);
69 	iowrite32(cq_message_enable, &cq->ctrl->cq_message_enable);
70 	iowrite32(interrupt_offset, &cq->ctrl->interrupt_offset);
71 	writeq(cq_message_addr, &cq->ctrl->cq_message_addr);
72 
73 	cq->interrupt_offset = interrupt_offset;
74 }
75 
76 void vnic_cq_clean(struct vnic_cq *cq)
77 {
78 	cq->to_clean = 0;
79 	cq->last_color = 0;
80 
81 	iowrite32(0, &cq->ctrl->cq_head);
82 	iowrite32(0, &cq->ctrl->cq_tail);
83 	iowrite32(1, &cq->ctrl->cq_tail_color);
84 
85 	vnic_dev_clear_desc_ring(&cq->ring);
86 }
87