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#include <linux/errno.h>
19#include <linux/types.h>
20#include <linux/pci.h>
21#include "vnic_dev.h"
22#include "vnic_cq.h"
23
24void svnic_cq_free(struct vnic_cq *cq)
25{
26	svnic_dev_free_desc_ring(cq->vdev, &cq->ring);
27
28	cq->ctrl = NULL;
29}
30
31int svnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq,
32	unsigned int index, unsigned int desc_count, unsigned int desc_size)
33{
34	int err;
35
36	cq->index = index;
37	cq->vdev = vdev;
38
39	cq->ctrl = svnic_dev_get_res(vdev, RES_TYPE_CQ, index);
40	if (!cq->ctrl) {
41		pr_err("Failed to hook CQ[%d] resource\n", index);
42
43		return -EINVAL;
44	}
45
46	err = svnic_dev_alloc_desc_ring(vdev, &cq->ring, desc_count, desc_size);
47	if (err)
48		return err;
49
50	return 0;
51}
52
53void svnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
54	unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
55	unsigned int cq_tail_color, unsigned int interrupt_enable,
56	unsigned int cq_entry_enable, unsigned int cq_message_enable,
57	unsigned int interrupt_offset, u64 cq_message_addr)
58{
59	u64 paddr;
60
61	paddr = (u64)cq->ring.base_addr | VNIC_PADDR_TARGET;
62	writeq(paddr, &cq->ctrl->ring_base);
63	iowrite32(cq->ring.desc_count, &cq->ctrl->ring_size);
64	iowrite32(flow_control_enable, &cq->ctrl->flow_control_enable);
65	iowrite32(color_enable, &cq->ctrl->color_enable);
66	iowrite32(cq_head, &cq->ctrl->cq_head);
67	iowrite32(cq_tail, &cq->ctrl->cq_tail);
68	iowrite32(cq_tail_color, &cq->ctrl->cq_tail_color);
69	iowrite32(interrupt_enable, &cq->ctrl->interrupt_enable);
70	iowrite32(cq_entry_enable, &cq->ctrl->cq_entry_enable);
71	iowrite32(cq_message_enable, &cq->ctrl->cq_message_enable);
72	iowrite32(interrupt_offset, &cq->ctrl->interrupt_offset);
73	writeq(cq_message_addr, &cq->ctrl->cq_message_addr);
74}
75
76void svnic_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	svnic_dev_clear_desc_ring(&cq->ring);
86}
87