[SCSI] fnic: Add new Cisco PCI-Express FCoE HBA

fnic is a driver for the Cisco PCI-Express FCoE HBA

Signed-off-by: Abhijeet Joglekar <abjoglek@cisco.com>
Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 182 insertions, 0 deletions

diff --git a/drivers/scsi/fnic/vnic_wq.c b/drivers/scsi/fnic/vnic_wq.c
new file mode 100644
index 000000000000..1f9ea790d130
--- /dev/null
+++ b/drivers/scsi/fnic/vnic_wq.c
@@ -0,0 +1,182 @@
+/*
+ * 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_dev.h"
+#include "vnic_wq.h"
+
+static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
+{
+        struct vnic_wq_buf *buf;
+        struct vnic_dev *vdev;
+        unsigned int i, j, count = wq->ring.desc_count;
+        unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
+
+        vdev = wq->vdev;
+
+        for (i = 0; i < blks; i++) {
+                wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
+                if (!wq->bufs[i]) {
+                        printk(KERN_ERR "Failed to alloc wq_bufs\n");
+                        return -ENOMEM;
+                }
+        }
+
+        for (i = 0; i < blks; i++) {
+                buf = wq->bufs[i];
+                for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) {
+                        buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + 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) {
+                                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++) {
+                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) {
+                printk(KERN_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;
+}
+
+void vnic_wq_init(struct vnic_wq *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);
+        iowrite32(0, &wq->ctrl->error_status);
+}
+
+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 < 100; wait++) {
+                if (!(ioread32(&wq->ctrl->running)))
+                        return 0;
+                udelay(1);
+        }
+
+        printk(KERN_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;
+
+        BUG_ON(ioread32(&wq->ctrl->enable));
+
+        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);
+}