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 
19 #include <linux/errno.h>
20 #include <linux/types.h>
21 #include <linux/pci.h>
22 #include <linux/delay.h>
23 #include "vnic_wq_copy.h"
24 
vnic_wq_copy_enable(struct vnic_wq_copy * wq)25 void vnic_wq_copy_enable(struct vnic_wq_copy *wq)
26 {
27 	iowrite32(1, &wq->ctrl->enable);
28 }
29 
vnic_wq_copy_disable(struct vnic_wq_copy * wq)30 int vnic_wq_copy_disable(struct vnic_wq_copy *wq)
31 {
32 	unsigned int wait;
33 
34 	iowrite32(0, &wq->ctrl->enable);
35 
36 	/* Wait for HW to ACK disable request */
37 	for (wait = 0; wait < 100; wait++) {
38 		if (!(ioread32(&wq->ctrl->running)))
39 			return 0;
40 		udelay(1);
41 	}
42 
43 	printk(KERN_ERR "Failed to disable Copy WQ[%d],"
44 	       " fetch index=%d, posted_index=%d\n",
45 	       wq->index, ioread32(&wq->ctrl->fetch_index),
46 	       ioread32(&wq->ctrl->posted_index));
47 
48 	return -ENODEV;
49 }
50 
vnic_wq_copy_clean(struct vnic_wq_copy * wq,void (* q_clean)(struct vnic_wq_copy * wq,struct fcpio_host_req * wq_desc))51 void vnic_wq_copy_clean(struct vnic_wq_copy *wq,
52 	void (*q_clean)(struct vnic_wq_copy *wq,
53 	struct fcpio_host_req *wq_desc))
54 {
55 	BUG_ON(ioread32(&wq->ctrl->enable));
56 
57 	if (vnic_wq_copy_desc_in_use(wq))
58 		vnic_wq_copy_service(wq, -1, q_clean);
59 
60 	wq->to_use_index = wq->to_clean_index = 0;
61 
62 	iowrite32(0, &wq->ctrl->fetch_index);
63 	iowrite32(0, &wq->ctrl->posted_index);
64 	iowrite32(0, &wq->ctrl->error_status);
65 
66 	vnic_dev_clear_desc_ring(&wq->ring);
67 }
68 
vnic_wq_copy_free(struct vnic_wq_copy * wq)69 void vnic_wq_copy_free(struct vnic_wq_copy *wq)
70 {
71 	struct vnic_dev *vdev;
72 
73 	vdev = wq->vdev;
74 	vnic_dev_free_desc_ring(vdev, &wq->ring);
75 	wq->ctrl = NULL;
76 }
77 
vnic_wq_copy_alloc(struct vnic_dev * vdev,struct vnic_wq_copy * wq,unsigned int index,unsigned int desc_count,unsigned int desc_size)78 int vnic_wq_copy_alloc(struct vnic_dev *vdev, struct vnic_wq_copy *wq,
79 		       unsigned int index, unsigned int desc_count,
80 		       unsigned int desc_size)
81 {
82 	wq->index = index;
83 	wq->vdev = vdev;
84 	wq->to_use_index = wq->to_clean_index = 0;
85 	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
86 	if (!wq->ctrl) {
87 		printk(KERN_ERR "Failed to hook COPY WQ[%d] resource\n", index);
88 		return -EINVAL;
89 	}
90 
91 	vnic_wq_copy_disable(wq);
92 
93 	return vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
94 }
95 
vnic_wq_copy_init(struct vnic_wq_copy * wq,unsigned int cq_index,unsigned int error_interrupt_enable,unsigned int error_interrupt_offset)96 void vnic_wq_copy_init(struct vnic_wq_copy *wq, unsigned int cq_index,
97 	unsigned int error_interrupt_enable,
98 	unsigned int error_interrupt_offset)
99 {
100 	u64 paddr;
101 
102 	paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
103 	writeq(paddr, &wq->ctrl->ring_base);
104 	iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
105 	iowrite32(0, &wq->ctrl->fetch_index);
106 	iowrite32(0, &wq->ctrl->posted_index);
107 	iowrite32(cq_index, &wq->ctrl->cq_index);
108 	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
109 	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
110 }
111 
112