drivers/scsi/fnic/vnic_wq_copy.c

   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
  25 void vnic_wq_copy_enable(struct vnic_wq_copy *wq)
  26 {
  27         iowrite32(1, &wq->ctrl->enable);
  28 }
  29
  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
  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
  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
  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
  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