xref: /openbmc/linux/drivers/scsi/fnic/vnic_wq_copy.c (revision e6550b3e)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
4  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
5  */
6 
7 #include <linux/errno.h>
8 #include <linux/types.h>
9 #include <linux/pci.h>
10 #include <linux/delay.h>
11 #include "vnic_wq_copy.h"
12 
vnic_wq_copy_enable(struct vnic_wq_copy * wq)13 void vnic_wq_copy_enable(struct vnic_wq_copy *wq)
14 {
15 	iowrite32(1, &wq->ctrl->enable);
16 }
17 
vnic_wq_copy_disable(struct vnic_wq_copy * wq)18 int vnic_wq_copy_disable(struct vnic_wq_copy *wq)
19 {
20 	unsigned int wait;
21 
22 	iowrite32(0, &wq->ctrl->enable);
23 
24 	/* Wait for HW to ACK disable request */
25 	for (wait = 0; wait < 100; wait++) {
26 		if (!(ioread32(&wq->ctrl->running)))
27 			return 0;
28 		udelay(1);
29 	}
30 
31 	printk(KERN_ERR "Failed to disable Copy WQ[%d],"
32 	       " fetch index=%d, posted_index=%d\n",
33 	       wq->index, ioread32(&wq->ctrl->fetch_index),
34 	       ioread32(&wq->ctrl->posted_index));
35 
36 	return -ENODEV;
37 }
38 
vnic_wq_copy_clean(struct vnic_wq_copy * wq,void (* q_clean)(struct vnic_wq_copy * wq,struct fcpio_host_req * wq_desc))39 void vnic_wq_copy_clean(struct vnic_wq_copy *wq,
40 	void (*q_clean)(struct vnic_wq_copy *wq,
41 	struct fcpio_host_req *wq_desc))
42 {
43 	BUG_ON(ioread32(&wq->ctrl->enable));
44 
45 	if (vnic_wq_copy_desc_in_use(wq))
46 		vnic_wq_copy_service(wq, -1, q_clean);
47 
48 	wq->to_use_index = wq->to_clean_index = 0;
49 
50 	iowrite32(0, &wq->ctrl->fetch_index);
51 	iowrite32(0, &wq->ctrl->posted_index);
52 	iowrite32(0, &wq->ctrl->error_status);
53 
54 	vnic_dev_clear_desc_ring(&wq->ring);
55 }
56 
vnic_wq_copy_free(struct vnic_wq_copy * wq)57 void vnic_wq_copy_free(struct vnic_wq_copy *wq)
58 {
59 	struct vnic_dev *vdev;
60 
61 	vdev = wq->vdev;
62 	vnic_dev_free_desc_ring(vdev, &wq->ring);
63 	wq->ctrl = NULL;
64 }
65 
vnic_wq_copy_alloc(struct vnic_dev * vdev,struct vnic_wq_copy * wq,unsigned int index,unsigned int desc_count,unsigned int desc_size)66 int vnic_wq_copy_alloc(struct vnic_dev *vdev, struct vnic_wq_copy *wq,
67 		       unsigned int index, unsigned int desc_count,
68 		       unsigned int desc_size)
69 {
70 	wq->index = index;
71 	wq->vdev = vdev;
72 	wq->to_use_index = wq->to_clean_index = 0;
73 	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
74 	if (!wq->ctrl) {
75 		printk(KERN_ERR "Failed to hook COPY WQ[%d] resource\n", index);
76 		return -EINVAL;
77 	}
78 
79 	vnic_wq_copy_disable(wq);
80 
81 	return vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
82 }
83 
vnic_wq_copy_init(struct vnic_wq_copy * wq,unsigned int cq_index,unsigned int error_interrupt_enable,unsigned int error_interrupt_offset)84 void vnic_wq_copy_init(struct vnic_wq_copy *wq, unsigned int cq_index,
85 	unsigned int error_interrupt_enable,
86 	unsigned int error_interrupt_offset)
87 {
88 	u64 paddr;
89 
90 	paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
91 	writeq(paddr, &wq->ctrl->ring_base);
92 	iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
93 	iowrite32(0, &wq->ctrl->fetch_index);
94 	iowrite32(0, &wq->ctrl->posted_index);
95 	iowrite32(cq_index, &wq->ctrl->cq_index);
96 	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
97 	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
98 }
99