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/*
* Copyright 2008-2010 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/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include "vnic_dev.h"
#include "vnic_wq.h"
static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
{
struct vnic_wq_buf *buf;
unsigned int i, j, count = wq->ring.desc_count;
unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
for (i = 0; i < blks; i++) {
wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_ATOMIC);
if (!wq->bufs[i])
return -ENOMEM;
}
for (i = 0; i < blks; i++) {
buf = wq->bufs[i];
for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) {
buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j;
buf->desc = (u8 *)wq->ring.descs +
wq->ring.desc_size * buf->index;
if (buf->index + 1 == count) {
buf->next = wq->bufs[0];
break;
} else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
buf->next = wq->bufs[i + 1];
} else {
buf->next = buf + 1;
buf++;
}
}
}
wq->to_use = wq->to_clean = wq->bufs[0];
return 0;
}
void vnic_wq_free(struct vnic_wq *wq)
{
struct vnic_dev *vdev;
unsigned int i;
vdev = wq->vdev;
vnic_dev_free_desc_ring(vdev, &wq->ring);
for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
if (wq->bufs[i]) {
kfree(wq->bufs[i]);
wq->bufs[i] = NULL;
}
}
wq->ctrl = NULL;
}
int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
unsigned int desc_count, unsigned int desc_size)
{
int err;
wq->index = index;
wq->vdev = vdev;
wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
if (!wq->ctrl) {
pr_err("Failed to hook WQ[%d] resource\n", index);
return -EINVAL;
}
vnic_wq_disable(wq);
err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
if (err)
return err;
err = vnic_wq_alloc_bufs(wq);
if (err) {
vnic_wq_free(wq);
return err;
}
return 0;
}
static void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
unsigned int fetch_index, unsigned int posted_index,
unsigned int error_interrupt_enable,
unsigned int error_interrupt_offset)
{
u64 paddr;
unsigned int count = wq->ring.desc_count;
paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
writeq(paddr, &wq->ctrl->ring_base);
iowrite32(count, &wq->ctrl->ring_size);
iowrite32(fetch_index, &wq->ctrl->fetch_index);
iowrite32(posted_index, &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);
iowrite32(0, &wq->ctrl->error_status);
wq->to_use = wq->to_clean =
&wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
[fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
}
void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
unsigned int error_interrupt_enable,
unsigned int error_interrupt_offset)
{
vnic_wq_init_start(wq, cq_index, 0, 0,
error_interrupt_enable,
error_interrupt_offset);
}
unsigned int vnic_wq_error_status(struct vnic_wq *wq)
{
return ioread32(&wq->ctrl->error_status);
}
void vnic_wq_enable(struct vnic_wq *wq)
{
iowrite32(1, &wq->ctrl->enable);
}
int vnic_wq_disable(struct vnic_wq *wq)
{
unsigned int wait;
iowrite32(0, &wq->ctrl->enable);
/* Wait for HW to ACK disable request */
for (wait = 0; wait < 1000; wait++) {
if (!(ioread32(&wq->ctrl->running)))
return 0;
udelay(10);
}
pr_err("Failed to disable WQ[%d]\n", wq->index);
return -ETIMEDOUT;
}
void vnic_wq_clean(struct vnic_wq *wq,
void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
{
struct vnic_wq_buf *buf;
buf = wq->to_clean;
while (vnic_wq_desc_used(wq) > 0) {
(*buf_clean)(wq, buf);
buf = wq->to_clean = buf->next;
wq->ring.desc_avail++;
}
wq->to_use = wq->to_clean = wq->bufs[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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