Release 4.7 drivers/scsi/fnic/vnic_wq_copy.c
/*
* Copyright 2008 Cisco Systems, Inc. All rights reserved.
* Copyright 2007 Nuova Systems, Inc. All rights reserved.
*
* This program is free software; you may redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include "vnic_wq_copy.h"
void vnic_wq_copy_enable(struct vnic_wq_copy *wq)
{
iowrite32(1, &wq->ctrl->enable);
}
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int vnic_wq_copy_disable(struct vnic_wq_copy *wq)
{
unsigned int wait;
iowrite32(0, &wq->ctrl->enable);
/* Wait for HW to ACK disable request */
for (wait = 0; wait < 100; wait++) {
if (!(ioread32(&wq->ctrl->running)))
return 0;
udelay(1);
}
printk(KERN_ERR "Failed to disable Copy WQ[%d],"
" fetch index=%d, posted_index=%d\n",
wq->index, ioread32(&wq->ctrl->fetch_index),
ioread32(&wq->ctrl->posted_index));
return -ENODEV;
}
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void vnic_wq_copy_clean(struct vnic_wq_copy *wq,
void (*q_clean)(struct vnic_wq_copy *wq,
struct fcpio_host_req *wq_desc))
{
BUG_ON(ioread32(&wq->ctrl->enable));
if (vnic_wq_copy_desc_in_use(wq))
vnic_wq_copy_service(wq, -1, q_clean);
wq->to_use_index = wq->to_clean_index = 0;
iowrite32(0, &wq->ctrl->fetch_index);
iowrite32(0, &wq->ctrl->posted_index);
iowrite32(0, &wq->ctrl->error_status);
vnic_dev_clear_desc_ring(&wq->ring);
}
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void vnic_wq_copy_free(struct vnic_wq_copy *wq)
{
struct vnic_dev *vdev;
vdev = wq->vdev;
vnic_dev_free_desc_ring(vdev, &wq->ring);
wq->ctrl = NULL;
}
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int vnic_wq_copy_alloc(struct vnic_dev *vdev, struct vnic_wq_copy *wq,
unsigned int index, unsigned int desc_count,
unsigned int desc_size)
{
int err;
wq->index = index;
wq->vdev = vdev;
wq->to_use_index = wq->to_clean_index = 0;
wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
if (!wq->ctrl) {
printk(KERN_ERR "Failed to hook COPY WQ[%d] resource\n", index);
return -EINVAL;
}
vnic_wq_copy_disable(wq);
err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
if (err)
return err;
return 0;
}
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void vnic_wq_copy_init(struct vnic_wq_copy *wq, unsigned int cq_index,
unsigned int error_interrupt_enable,
unsigned int error_interrupt_offset)
{
u64 paddr;
paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
writeq(paddr, &wq->ctrl->ring_base);
iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
iowrite32(0, &wq->ctrl->fetch_index);
iowrite32(0, &wq->ctrl->posted_index);
iowrite32(cq_index, &wq->ctrl->cq_index);
iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
}
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