1 files changed, 144 insertions, 0 deletions

diff --git a/drivers/scsi/ibmvscsi/iseries_vscsi.c b/drivers/scsi/ibmvscsi/iseries_vscsi.c
new file mode 100644
index 000000000000..e9202f2a8276
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/iseries_vscsi.c
@@ -0,0 +1,144 @@
+/* ------------------------------------------------------------
+ * iSeries_vscsi.c
+ * (C) Copyright IBM Corporation 1994, 2003
+ * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
+ *          Santiago Leon (santil@us.ibm.com)
+ *          Dave Boutcher (sleddog@us.ibm.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
+ * USA
+ *
+ * ------------------------------------------------------------
+ * iSeries-specific functions of the SCSI host adapter for Virtual I/O devices
+ *
+ * This driver allows the Linux SCSI peripheral drivers to directly
+ * access devices in the hosting partition, either on an iSeries
+ * hypervisor system or a converged hypervisor system.
+ */
+
+#include <asm/iSeries/vio.h>
+#include <asm/iSeries/HvLpEvent.h>
+#include <asm/iSeries/HvTypes.h>
+#include <asm/iSeries/HvLpConfig.h>
+#include <asm/vio.h>
+#include <linux/device.h>
+#include "ibmvscsi.h"
+
+/* global variables */
+static struct ibmvscsi_host_data *single_host_data;
+
+/* ------------------------------------------------------------
+ * Routines for direct interpartition interaction
+ */
+struct srp_lp_event {
+        struct HvLpEvent lpevt; /* 0x00-0x17          */
+        u32 reserved1;          /* 0x18-0x1B; unused  */
+        u16 version;            /* 0x1C-0x1D; unused  */
+        u16 subtype_rc;         /* 0x1E-0x1F; unused  */
+        struct viosrp_crq crq;  /* 0x20-0x3F          */
+};
+
+/** 
+ * standard interface for handling logical partition events.
+ */
+static void ibmvscsi_handle_event(struct HvLpEvent *lpevt)
+{
+        struct srp_lp_event *evt = (struct srp_lp_event *)lpevt;
+
+        if (!evt) {
+                printk(KERN_ERR "ibmvscsi: received null event\n");
+                return;
+        }
+
+        if (single_host_data == NULL) {
+                printk(KERN_ERR
+                       "ibmvscsi: received event, no adapter present\n");
+                return;
+        }
+
+        ibmvscsi_handle_crq(&evt->crq, single_host_data);
+}
+
+/* ------------------------------------------------------------
+ * Routines for driver initialization
+ */
+int ibmvscsi_init_crq_queue(struct crq_queue *queue,
+                            struct ibmvscsi_host_data *hostdata,
+                            int max_requests)
+{
+        int rc;
+
+        single_host_data = hostdata;
+        rc = viopath_open(viopath_hostLp, viomajorsubtype_scsi, 0);
+        if (rc < 0) {
+                printk("viopath_open failed with rc %d in open_event_path\n",
+                       rc);
+                goto viopath_open_failed;
+        }
+
+        rc = vio_setHandler(viomajorsubtype_scsi, ibmvscsi_handle_event);
+        if (rc < 0) {
+                printk("vio_setHandler failed with rc %d in open_event_path\n",
+                       rc);
+                goto vio_setHandler_failed;
+        }
+        return 0;
+
+      vio_setHandler_failed:
+        viopath_close(viopath_hostLp, viomajorsubtype_scsi, max_requests);
+      viopath_open_failed:
+        return -1;
+}
+
+void ibmvscsi_release_crq_queue(struct crq_queue *queue,
+                                struct ibmvscsi_host_data *hostdata,
+                                int max_requests)
+{
+        vio_clearHandler(viomajorsubtype_scsi);
+        viopath_close(viopath_hostLp, viomajorsubtype_scsi, max_requests);
+}
+
+/**
+ * reset_crq_queue: - resets a crq after a failure
+ * @queue:      crq_queue to initialize and register
+ * @hostdata:   ibmvscsi_host_data of host
+ *
+ * no-op for iSeries
+ */
+void ibmvscsi_reset_crq_queue(struct crq_queue *queue,
+                              struct ibmvscsi_host_data *hostdata)
+{
+}
+
+/**
+ * ibmvscsi_send_crq: - Send a CRQ
+ * @hostdata:   the adapter
+ * @word1:      the first 64 bits of the data
+ * @word2:      the second 64 bits of the data
+ */
+int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, u64 word1, u64 word2)
+{
+        single_host_data = hostdata;
+        return HvCallEvent_signalLpEventFast(viopath_hostLp,
+                                             HvLpEvent_Type_VirtualIo,
+                                             viomajorsubtype_scsi,
+                                             HvLpEvent_AckInd_NoAck,
+                                             HvLpEvent_AckType_ImmediateAck,
+                                             viopath_sourceinst(viopath_hostLp),
+                                             viopath_targetinst(viopath_hostLp),
+                                             0,
+                                             VIOVERSION << 16, word1, word2, 0,
+                                             0);
+}