xref: /openbmc/linux/drivers/scsi/snic/vnic_cq.c (revision c4f7ac64)
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 
24 void 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 
31 int 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 	cq->index = index;
35 	cq->vdev = vdev;
36 
37 	cq->ctrl = svnic_dev_get_res(vdev, RES_TYPE_CQ, index);
38 	if (!cq->ctrl) {
39 		pr_err("Failed to hook CQ[%d] resource\n", index);
40 
41 		return -EINVAL;
42 	}
43 
44 	return svnic_dev_alloc_desc_ring(vdev, &cq->ring, desc_count, desc_size);
45 }
46 
47 void svnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
48 	unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
49 	unsigned int cq_tail_color, unsigned int interrupt_enable,
50 	unsigned int cq_entry_enable, unsigned int cq_message_enable,
51 	unsigned int interrupt_offset, u64 cq_message_addr)
52 {
53 	u64 paddr;
54 
55 	paddr = (u64)cq->ring.base_addr | VNIC_PADDR_TARGET;
56 	writeq(paddr, &cq->ctrl->ring_base);
57 	iowrite32(cq->ring.desc_count, &cq->ctrl->ring_size);
58 	iowrite32(flow_control_enable, &cq->ctrl->flow_control_enable);
59 	iowrite32(color_enable, &cq->ctrl->color_enable);
60 	iowrite32(cq_head, &cq->ctrl->cq_head);
61 	iowrite32(cq_tail, &cq->ctrl->cq_tail);
62 	iowrite32(cq_tail_color, &cq->ctrl->cq_tail_color);
63 	iowrite32(interrupt_enable, &cq->ctrl->interrupt_enable);
64 	iowrite32(cq_entry_enable, &cq->ctrl->cq_entry_enable);
65 	iowrite32(cq_message_enable, &cq->ctrl->cq_message_enable);
66 	iowrite32(interrupt_offset, &cq->ctrl->interrupt_offset);
67 	writeq(cq_message_addr, &cq->ctrl->cq_message_addr);
68 }
69 
70 void svnic_cq_clean(struct vnic_cq *cq)
71 {
72 	cq->to_clean = 0;
73 	cq->last_color = 0;
74 
75 	iowrite32(0, &cq->ctrl->cq_head);
76 	iowrite32(0, &cq->ctrl->cq_tail);
77 	iowrite32(1, &cq->ctrl->cq_tail_color);
78 
79 	svnic_dev_clear_desc_ring(&cq->ring);
80 }
81