1 files changed, 830 insertions, 0 deletions

diff --git a/drivers/message/i2o/i2o_scsi.c b/drivers/message/i2o/i2o_scsi.c
new file mode 100644
index 000000000000..43f5875e0be5
--- /dev/null
+++ b/drivers/message/i2o/i2o_scsi.c
@@ -0,0 +1,830 @@
+/*
+ * 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, 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.
+ *
+ * For the avoidance of doubt the "preferred form" of this code is one which
+ * is in an open non patent encumbered format. Where cryptographic key signing
+ * forms part of the process of creating an executable the information
+ * including keys needed to generate an equivalently functional executable
+ * are deemed to be part of the source code.
+ *
+ *  Complications for I2O scsi
+ *
+ *      o       Each (bus,lun) is a logical device in I2O. We keep a map
+ *              table. We spoof failed selection for unmapped units
+ *      o       Request sense buffers can come back for free.
+ *      o       Scatter gather is a bit dynamic. We have to investigate at
+ *              setup time.
+ *      o       Some of our resources are dynamically shared. The i2o core
+ *              needs a message reservation protocol to avoid swap v net
+ *              deadlocking. We need to back off queue requests.
+ *
+ *      In general the firmware wants to help. Where its help isn't performance
+ *      useful we just ignore the aid. Its not worth the code in truth.
+ *
+ * Fixes/additions:
+ *      Steve Ralston:
+ *              Scatter gather now works
+ *      Markus Lidel <Markus.Lidel@shadowconnect.com>:
+ *              Minor fixes for 2.6.
+ *
+ * To Do:
+ *      64bit cleanups
+ *      Fix the resource management problems.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/jiffies.h>
+#include <linux/interrupt.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <linux/proc_fs.h>
+#include <linux/prefetch.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include <linux/i2o.h>
+
+#include <asm/dma.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/atomic.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+
+#define OSM_NAME        "scsi-osm"
+#define OSM_VERSION     "$Rev$"
+#define OSM_DESCRIPTION "I2O SCSI Peripheral OSM"
+
+static struct i2o_driver i2o_scsi_driver;
+
+static int i2o_scsi_max_id = 16;
+static int i2o_scsi_max_lun = 8;
+
+struct i2o_scsi_host {
+        struct Scsi_Host *scsi_host;    /* pointer to the SCSI host */
+        struct i2o_controller *iop;     /* pointer to the I2O controller */
+        struct i2o_device *channel[0];  /* channel->i2o_dev mapping table */
+};
+
+static struct scsi_host_template i2o_scsi_host_template;
+
+#define I2O_SCSI_CAN_QUEUE      4
+
+/* SCSI OSM class handling definition */
+static struct i2o_class_id i2o_scsi_class_id[] = {
+        {I2O_CLASS_SCSI_PERIPHERAL},
+        {I2O_CLASS_END}
+};
+
+static struct i2o_scsi_host *i2o_scsi_host_alloc(struct i2o_controller *c)
+{
+        struct i2o_scsi_host *i2o_shost;
+        struct i2o_device *i2o_dev;
+        struct Scsi_Host *scsi_host;
+        int max_channel = 0;
+        u8 type;
+        int i;
+        size_t size;
+        i2o_status_block *sb;
+
+        list_for_each_entry(i2o_dev, &c->devices, list)
+            if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER_PORT) {
+                if (i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1) || (type == 1))    /* SCSI bus */
+                        max_channel++;
+        }
+
+        if (!max_channel) {
+                osm_warn("no channels found on %s\n", c->name);
+                return ERR_PTR(-EFAULT);
+        }
+
+        size = max_channel * sizeof(struct i2o_device *)
+            + sizeof(struct i2o_scsi_host);
+
+        scsi_host = scsi_host_alloc(&i2o_scsi_host_template, size);
+        if (!scsi_host) {
+                osm_warn("Could not allocate SCSI host\n");
+                return ERR_PTR(-ENOMEM);
+        }
+
+        scsi_host->max_channel = max_channel - 1;
+        scsi_host->max_id = i2o_scsi_max_id;
+        scsi_host->max_lun = i2o_scsi_max_lun;
+        scsi_host->this_id = c->unit;
+
+        sb = c->status_block.virt;
+
+        scsi_host->sg_tablesize = (sb->inbound_frame_size -
+                                   sizeof(struct i2o_message) / 4 - 6) / 2;
+
+        i2o_shost = (struct i2o_scsi_host *)scsi_host->hostdata;
+        i2o_shost->scsi_host = scsi_host;
+        i2o_shost->iop = c;
+
+        i = 0;
+        list_for_each_entry(i2o_dev, &c->devices, list)
+            if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER_PORT) {
+                if (i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1) || (type == 1))    /* only SCSI bus */
+                        i2o_shost->channel[i++] = i2o_dev;
+
+                if (i >= max_channel)
+                        break;
+        }
+
+        return i2o_shost;
+};
+
+/**
+ *      i2o_scsi_get_host - Get an I2O SCSI host
+ *      @c: I2O controller to for which to get the SCSI host
+ *
+ *      If the I2O controller already exists as SCSI host, the SCSI host
+ *      is returned, otherwise the I2O controller is added to the SCSI
+ *      core.
+ *
+ *      Returns pointer to the I2O SCSI host on success or NULL on failure.
+ */
+static struct i2o_scsi_host *i2o_scsi_get_host(struct i2o_controller *c)
+{
+        return c->driver_data[i2o_scsi_driver.context];
+};
+
+/**
+ *      i2o_scsi_remove - Remove I2O device from SCSI core
+ *      @dev: device which should be removed
+ *
+ *      Removes the I2O device from the SCSI core again.
+ *
+ *      Returns 0 on success.
+ */
+static int i2o_scsi_remove(struct device *dev)
+{
+        struct i2o_device *i2o_dev = to_i2o_device(dev);
+        struct i2o_controller *c = i2o_dev->iop;
+        struct i2o_scsi_host *i2o_shost;
+        struct scsi_device *scsi_dev;
+
+        i2o_shost = i2o_scsi_get_host(c);
+
+        shost_for_each_device(scsi_dev, i2o_shost->scsi_host)
+            if (scsi_dev->hostdata == i2o_dev) {
+                scsi_remove_device(scsi_dev);
+                scsi_device_put(scsi_dev);
+                break;
+        }
+
+        return 0;
+};
+
+/**
+ *      i2o_scsi_probe - verify if dev is a I2O SCSI device and install it
+ *      @dev: device to verify if it is a I2O SCSI device
+ *
+ *      Retrieve channel, id and lun for I2O device. If everthing goes well
+ *      register the I2O device as SCSI device on the I2O SCSI controller.
+ *
+ *      Returns 0 on success or negative error code on failure.
+ */
+static int i2o_scsi_probe(struct device *dev)
+{
+        struct i2o_device *i2o_dev = to_i2o_device(dev);
+        struct i2o_controller *c = i2o_dev->iop;
+        struct i2o_scsi_host *i2o_shost;
+        struct Scsi_Host *scsi_host;
+        struct i2o_device *parent;
+        struct scsi_device *scsi_dev;
+        u32 id;
+        u64 lun;
+        int channel = -1;
+        int i;
+
+        i2o_shost = i2o_scsi_get_host(c);
+        if (!i2o_shost)
+                return -EFAULT;
+
+        scsi_host = i2o_shost->scsi_host;
+
+        if (i2o_parm_field_get(i2o_dev, 0, 3, &id, 4) < 0)
+                return -EFAULT;
+
+        if (id >= scsi_host->max_id) {
+                osm_warn("SCSI device id (%d) >= max_id of I2O host (%d)", id,
+                         scsi_host->max_id);
+                return -EFAULT;
+        }
+
+        if (i2o_parm_field_get(i2o_dev, 0, 4, &lun, 8) < 0)
+                return -EFAULT;
+        if (lun >= scsi_host->max_lun) {
+                osm_warn("SCSI device id (%d) >= max_lun of I2O host (%d)",
+                         (unsigned int)lun, scsi_host->max_lun);
+                return -EFAULT;
+        }
+
+        parent = i2o_iop_find_device(c, i2o_dev->lct_data.parent_tid);
+        if (!parent) {
+                osm_warn("can not find parent of device %03x\n",
+                         i2o_dev->lct_data.tid);
+                return -EFAULT;
+        }
+
+        for (i = 0; i <= i2o_shost->scsi_host->max_channel; i++)
+                if (i2o_shost->channel[i] == parent)
+                        channel = i;
+
+        if (channel == -1) {
+                osm_warn("can not find channel of device %03x\n",
+                         i2o_dev->lct_data.tid);
+                return -EFAULT;
+        }
+
+        scsi_dev =
+            __scsi_add_device(i2o_shost->scsi_host, channel, id, lun, i2o_dev);
+
+        if (!scsi_dev) {
+                osm_warn("can not add SCSI device %03x\n",
+                         i2o_dev->lct_data.tid);
+                return -EFAULT;
+        }
+
+        osm_debug("added new SCSI device %03x (cannel: %d, id: %d, lun: %d)\n",
+                  i2o_dev->lct_data.tid, channel, id, (unsigned int)lun);
+
+        return 0;
+};
+
+static const char *i2o_scsi_info(struct Scsi_Host *SChost)
+{
+        struct i2o_scsi_host *hostdata;
+        hostdata = (struct i2o_scsi_host *)SChost->hostdata;
+        return hostdata->iop->name;
+}
+
+/**
+ *      i2o_scsi_reply - SCSI OSM message reply handler
+ *      @c: controller issuing the reply
+ *      @m: message id for flushing
+ *      @msg: the message from the controller
+ *
+ *      Process reply messages (interrupts in normal scsi controller think).
+ *      We can get a variety of messages to process. The normal path is
+ *      scsi command completions. We must also deal with IOP failures,
+ *      the reply to a bus reset and the reply to a LUN query.
+ *
+ *      Returns 0 on success and if the reply should not be flushed or > 0
+ *      on success and if the reply should be flushed. Returns negative error
+ *      code on failure and if the reply should be flushed.
+ */
+static int i2o_scsi_reply(struct i2o_controller *c, u32 m,
+                          struct i2o_message *msg)
+{
+        struct scsi_cmnd *cmd;
+        struct device *dev;
+        u8 as, ds, st;
+
+        cmd = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
+
+        if (msg->u.head[0] & (1 << 13)) {
+                struct i2o_message __iomem *pmsg;       /* preserved message */
+                u32 pm;
+                int err = DID_ERROR;
+
+                pm = le32_to_cpu(msg->body[3]);
+
+                pmsg = i2o_msg_in_to_virt(c, pm);
+
+                osm_err("IOP fail.\n");
+                osm_err("From %d To %d Cmd %d.\n",
+                        (msg->u.head[1] >> 12) & 0xFFF,
+                        msg->u.head[1] & 0xFFF, msg->u.head[1] >> 24);
+                osm_err("Failure Code %d.\n", msg->body[0] >> 24);
+                if (msg->body[0] & (1 << 16))
+                        osm_err("Format error.\n");
+                if (msg->body[0] & (1 << 17))
+                        osm_err("Path error.\n");
+                if (msg->body[0] & (1 << 18))
+                        osm_err("Path State.\n");
+                if (msg->body[0] & (1 << 18))
+                {
+                        osm_err("Congestion.\n");
+                        err = DID_BUS_BUSY;
+                }
+
+                osm_debug("Failing message is %p.\n", pmsg);
+
+                cmd = i2o_cntxt_list_get(c, readl(&pmsg->u.s.tcntxt));
+                if (!cmd)
+                        return 1;
+
+                cmd->result = err << 16;
+                cmd->scsi_done(cmd);
+
+                /* Now flush the message by making it a NOP */
+                i2o_msg_nop(c, pm);
+
+                return 1;
+        }
+
+        /*
+         *      Low byte is device status, next is adapter status,
+         *      (then one byte reserved), then request status.
+         */
+        ds = (u8) le32_to_cpu(msg->body[0]);
+        as = (u8) (le32_to_cpu(msg->body[0]) >> 8);
+        st = (u8) (le32_to_cpu(msg->body[0]) >> 24);
+
+        /*
+         *      Is this a control request coming back - eg an abort ?
+         */
+
+        if (!cmd) {
+                if (st)
+                        osm_warn("SCSI abort: %08X", le32_to_cpu(msg->body[0]));
+                osm_info("SCSI abort completed.\n");
+                return -EFAULT;
+        }
+
+        osm_debug("Completed %ld\n", cmd->serial_number);
+
+        if (st) {
+                u32 count, error;
+                /* An error has occurred */
+
+                switch (st) {
+                case 0x06:
+                        count = le32_to_cpu(msg->body[1]);
+                        if (count < cmd->underflow) {
+                                int i;
+
+                                osm_err("SCSI underflow 0x%08X 0x%08X\n", count,
+                                        cmd->underflow);
+                                osm_debug("Cmd: ");
+                                for (i = 0; i < 15; i++)
+                                        pr_debug("%02X ", cmd->cmnd[i]);
+                                pr_debug(".\n");
+                                cmd->result = (DID_ERROR << 16);
+                        }
+                        break;
+
+                default:
+                        error = le32_to_cpu(msg->body[0]);
+
+                        osm_err("SCSI error %08x\n", error);
+
+                        if ((error & 0xff) == 0x02 /*CHECK_CONDITION */ ) {
+                                int i;
+                                u32 len = sizeof(cmd->sense_buffer);
+                                len = (len > 40) ? 40 : len;
+                                // Copy over the sense data
+                                memcpy(cmd->sense_buffer, (void *)&msg->body[3],
+                                       len);
+                                for (i = 0; i <= len; i++)
+                                        osm_info("%02x\n",
+                                                 cmd->sense_buffer[i]);
+                                if (cmd->sense_buffer[0] == 0x70
+                                    && cmd->sense_buffer[2] == DATA_PROTECT) {
+                                        /* This is to handle an array failed */
+                                        cmd->result = (DID_TIME_OUT << 16);
+                                        printk(KERN_WARNING "%s: SCSI Data "
+                                               "Protect-Device (%d,%d,%d) "
+                                               "hba_status=0x%x, dev_status="
+                                               "0x%x, cmd=0x%x\n", c->name,
+                                               (u32) cmd->device->channel,
+                                               (u32) cmd->device->id,
+                                               (u32) cmd->device->lun,
+                                               (error >> 8) & 0xff,
+                                               error & 0xff, cmd->cmnd[0]);
+                                } else
+                                        cmd->result = (DID_ERROR << 16);
+
+                                break;
+                        }
+
+                        switch (as) {
+                        case 0x0E:
+                                /* SCSI Reset */
+                                cmd->result = DID_RESET << 16;
+                                break;
+
+                        case 0x0F:
+                                cmd->result = DID_PARITY << 16;
+                                break;
+
+                        default:
+                                cmd->result = DID_ERROR << 16;
+                                break;
+                        }
+
+                        break;
+                }
+
+                cmd->scsi_done(cmd);
+                return 1;
+        }
+
+        cmd->result = DID_OK << 16 | ds;
+
+        cmd->scsi_done(cmd);
+
+        dev = &c->pdev->dev;
+        if (cmd->use_sg)
+                dma_unmap_sg(dev, (struct scatterlist *)cmd->buffer,
+                             cmd->use_sg, cmd->sc_data_direction);
+        else if (cmd->request_bufflen)
+                dma_unmap_single(dev, (dma_addr_t) ((long)cmd->SCp.ptr),
+                                 cmd->request_bufflen, cmd->sc_data_direction);
+
+        return 1;
+};
+
+/**
+ *      i2o_scsi_notify_controller_add - Retrieve notifications of added
+ *                                       controllers
+ *      @c: the controller which was added
+ *
+ *      If a I2O controller is added, we catch the notification to add a
+ *      corresponding Scsi_Host.
+ */
+static void i2o_scsi_notify_controller_add(struct i2o_controller *c)
+{
+        struct i2o_scsi_host *i2o_shost;
+        int rc;
+
+        i2o_shost = i2o_scsi_host_alloc(c);
+        if (IS_ERR(i2o_shost)) {
+                osm_err("Could not initialize SCSI host\n");
+                return;
+        }
+
+        rc = scsi_add_host(i2o_shost->scsi_host, &c->device);
+        if (rc) {
+                osm_err("Could not add SCSI host\n");
+                scsi_host_put(i2o_shost->scsi_host);
+                return;
+        }
+
+        c->driver_data[i2o_scsi_driver.context] = i2o_shost;
+
+        osm_debug("new I2O SCSI host added\n");
+};
+
+/**
+ *      i2o_scsi_notify_controller_remove - Retrieve notifications of removed
+ *                                          controllers
+ *      @c: the controller which was removed
+ *
+ *      If a I2O controller is removed, we catch the notification to remove the
+ *      corresponding Scsi_Host.
+ */
+static void i2o_scsi_notify_controller_remove(struct i2o_controller *c)
+{
+        struct i2o_scsi_host *i2o_shost;
+        i2o_shost = i2o_scsi_get_host(c);
+        if (!i2o_shost)
+                return;
+
+        c->driver_data[i2o_scsi_driver.context] = NULL;
+
+        scsi_remove_host(i2o_shost->scsi_host);
+        scsi_host_put(i2o_shost->scsi_host);
+        pr_info("I2O SCSI host removed\n");
+};
+
+/* SCSI OSM driver struct */
+static struct i2o_driver i2o_scsi_driver = {
+        .name = OSM_NAME,
+        .reply = i2o_scsi_reply,
+        .classes = i2o_scsi_class_id,
+        .notify_controller_add = i2o_scsi_notify_controller_add,
+        .notify_controller_remove = i2o_scsi_notify_controller_remove,
+        .driver = {
+                   .probe = i2o_scsi_probe,
+                   .remove = i2o_scsi_remove,
+                   },
+};
+
+/**
+ *      i2o_scsi_queuecommand - queue a SCSI command
+ *      @SCpnt: scsi command pointer
+ *      @done: callback for completion
+ *
+ *      Issue a scsi command asynchronously. Return 0 on success or 1 if
+ *      we hit an error (normally message queue congestion). The only
+ *      minor complication here is that I2O deals with the device addressing
+ *      so we have to map the bus/dev/lun back to an I2O handle as well
+ *      as faking absent devices ourself.
+ *
+ *      Locks: takes the controller lock on error path only
+ */
+
+static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt,
+                                 void (*done) (struct scsi_cmnd *))
+{
+        struct i2o_controller *c;
+        struct Scsi_Host *host;
+        struct i2o_device *i2o_dev;
+        struct device *dev;
+        int tid;
+        struct i2o_message __iomem *msg;
+        u32 m;
+        u32 scsi_flags, sg_flags;
+        u32 __iomem *mptr;
+        u32 __iomem *lenptr;
+        u32 len, reqlen;
+        int i;
+
+        /*
+         *      Do the incoming paperwork
+         */
+
+        i2o_dev = SCpnt->device->hostdata;
+        host = SCpnt->device->host;
+        c = i2o_dev->iop;
+        dev = &c->pdev->dev;
+
+        SCpnt->scsi_done = done;
+
+        if (unlikely(!i2o_dev)) {
+                osm_warn("no I2O device in request\n");
+                SCpnt->result = DID_NO_CONNECT << 16;
+                done(SCpnt);
+                return 0;
+        }
+
+        tid = i2o_dev->lct_data.tid;
+
+        osm_debug("qcmd: Tid = %03x\n", tid);
+        osm_debug("Real scsi messages.\n");
+
+        /*
+         *      Obtain an I2O message. If there are none free then
+         *      throw it back to the scsi layer
+         */
+
+        m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
+        if (m == I2O_QUEUE_EMPTY)
+                return SCSI_MLQUEUE_HOST_BUSY;
+
+        /*
+         *      Put together a scsi execscb message
+         */
+
+        len = SCpnt->request_bufflen;
+
+        switch (SCpnt->sc_data_direction) {
+        case PCI_DMA_NONE:
+                scsi_flags = 0x00000000;        // DATA NO XFER
+                sg_flags = 0x00000000;
+                break;
+
+        case PCI_DMA_TODEVICE:
+                scsi_flags = 0x80000000;        // DATA OUT (iop-->dev)
+                sg_flags = 0x14000000;
+                break;
+
+        case PCI_DMA_FROMDEVICE:
+                scsi_flags = 0x40000000;        // DATA IN  (iop<--dev)
+                sg_flags = 0x10000000;
+                break;
+
+        default:
+                /* Unknown - kill the command */
+                SCpnt->result = DID_NO_CONNECT << 16;
+                done(SCpnt);
+                return 0;
+        }
+
+        writel(I2O_CMD_SCSI_EXEC << 24 | HOST_TID << 12 | tid, &msg->u.head[1]);
+        writel(i2o_scsi_driver.context, &msg->u.s.icntxt);
+
+        /* We want the SCSI control block back */
+        writel(i2o_cntxt_list_add(c, SCpnt), &msg->u.s.tcntxt);
+
+        /* LSI_920_PCI_QUIRK
+         *
+         *      Intermittant observations of msg frame word data corruption
+         *      observed on msg[4] after:
+         *        WRITE, READ-MODIFY-WRITE
+         *      operations.  19990606 -sralston
+         *
+         *      (Hence we build this word via tag. Its good practice anyway
+         *       we don't want fetches over PCI needlessly)
+         */
+
+        /* Attach tags to the devices */
+        /*
+           if(SCpnt->device->tagged_supported) {
+           if(SCpnt->tag == HEAD_OF_QUEUE_TAG)
+           scsi_flags |= 0x01000000;
+           else if(SCpnt->tag == ORDERED_QUEUE_TAG)
+           scsi_flags |= 0x01800000;
+           }
+         */
+
+        /* Direction, disconnect ok, tag, CDBLen */
+        writel(scsi_flags | 0x20200000 | SCpnt->cmd_len, &msg->body[0]);
+
+        mptr = &msg->body[1];
+
+        /* Write SCSI command into the message - always 16 byte block */
+        memcpy_toio(mptr, SCpnt->cmnd, 16);
+        mptr += 4;
+        lenptr = mptr++;        /* Remember me - fill in when we know */
+
+        reqlen = 12;            // SINGLE SGE
+
+        /* Now fill in the SGList and command */
+        if (SCpnt->use_sg) {
+                struct scatterlist *sg;
+                int sg_count;
+
+                sg = SCpnt->request_buffer;
+                len = 0;
+
+                sg_count = dma_map_sg(dev, sg, SCpnt->use_sg,
+                                      SCpnt->sc_data_direction);
+
+                if (unlikely(sg_count <= 0))
+                        return -ENOMEM;
+
+                for (i = SCpnt->use_sg; i > 0; i--) {
+                        if (i == 1)
+                                sg_flags |= 0xC0000000;
+                        writel(sg_flags | sg_dma_len(sg), mptr++);
+                        writel(sg_dma_address(sg), mptr++);
+                        len += sg_dma_len(sg);
+                        sg++;
+                }
+
+                reqlen = mptr - &msg->u.head[0];
+                writel(len, lenptr);
+        } else {
+                len = SCpnt->request_bufflen;
+
+                writel(len, lenptr);
+
+                if (len > 0) {
+                        dma_addr_t dma_addr;
+
+                        dma_addr = dma_map_single(dev, SCpnt->request_buffer,
+                                                  SCpnt->request_bufflen,
+                                                  SCpnt->sc_data_direction);
+                        if (!dma_addr)
+                                return -ENOMEM;
+
+                        SCpnt->SCp.ptr = (void *)(unsigned long)dma_addr;
+                        sg_flags |= 0xC0000000;
+                        writel(sg_flags | SCpnt->request_bufflen, mptr++);
+                        writel(dma_addr, mptr++);
+                } else
+                        reqlen = 9;
+        }
+
+        /* Stick the headers on */
+        writel(reqlen << 16 | SGL_OFFSET_10, &msg->u.head[0]);
+
+        /* Queue the message */
+        i2o_msg_post(c, m);
+
+        osm_debug("Issued %ld\n", SCpnt->serial_number);
+
+        return 0;
+};
+
+/**
+ *      i2o_scsi_abort - abort a running command
+ *      @SCpnt: command to abort
+ *
+ *      Ask the I2O controller to abort a command. This is an asynchrnous
+ *      process and our callback handler will see the command complete with an
+ *      aborted message if it succeeds.
+ *
+ *      Returns 0 if the command is successfully aborted or negative error code
+ *      on failure.
+ */
+static int i2o_scsi_abort(struct scsi_cmnd *SCpnt)
+{
+        struct i2o_device *i2o_dev;
+        struct i2o_controller *c;
+        struct i2o_message __iomem *msg;
+        u32 m;
+        int tid;
+        int status = FAILED;
+
+        osm_warn("Aborting command block.\n");
+
+        i2o_dev = SCpnt->device->hostdata;
+        c = i2o_dev->iop;
+        tid = i2o_dev->lct_data.tid;
+
+        m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
+        if (m == I2O_QUEUE_EMPTY)
+                return SCSI_MLQUEUE_HOST_BUSY;
+
+        writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
+        writel(I2O_CMD_SCSI_ABORT << 24 | HOST_TID << 12 | tid,
+               &msg->u.head[1]);
+        writel(i2o_cntxt_list_get_ptr(c, SCpnt), &msg->body[0]);
+
+        if (i2o_msg_post_wait(c, m, I2O_TIMEOUT_SCSI_SCB_ABORT))
+                status = SUCCESS;
+
+        return status;
+}
+
+/**
+ *      i2o_scsi_bios_param     -       Invent disk geometry
+ *      @sdev: scsi device
+ *      @dev: block layer device
+ *      @capacity: size in sectors
+ *      @ip: geometry array
+ *
+ *      This is anyones guess quite frankly. We use the same rules everyone
+ *      else appears to and hope. It seems to work.
+ */
+
+static int i2o_scsi_bios_param(struct scsi_device *sdev,
+                               struct block_device *dev, sector_t capacity,
+                               int *ip)
+{
+        int size;
+
+        size = capacity;
+        ip[0] = 64;             /* heads                        */
+        ip[1] = 32;             /* sectors                      */
+        if ((ip[2] = size >> 11) > 1024) {      /* cylinders, test for big disk */
+                ip[0] = 255;    /* heads                        */
+                ip[1] = 63;     /* sectors                      */
+                ip[2] = size / (255 * 63);      /* cylinders                    */
+        }
+        return 0;
+}
+
+static struct scsi_host_template i2o_scsi_host_template = {
+        .proc_name = OSM_NAME,
+        .name = OSM_DESCRIPTION,
+        .info = i2o_scsi_info,
+        .queuecommand = i2o_scsi_queuecommand,
+        .eh_abort_handler = i2o_scsi_abort,
+        .bios_param = i2o_scsi_bios_param,
+        .can_queue = I2O_SCSI_CAN_QUEUE,
+        .sg_tablesize = 8,
+        .cmd_per_lun = 6,
+        .use_clustering = ENABLE_CLUSTERING,
+};
+
+/**
+ *      i2o_scsi_init - SCSI OSM initialization function
+ *
+ *      Register SCSI OSM into I2O core.
+ *
+ *      Returns 0 on success or negative error code on failure.
+ */
+static int __init i2o_scsi_init(void)
+{
+        int rc;
+
+        printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
+
+        /* Register SCSI OSM into I2O core */
+        rc = i2o_driver_register(&i2o_scsi_driver);
+        if (rc) {
+                osm_err("Could not register SCSI driver\n");
+                return rc;
+        }
+
+        return 0;
+};
+
+/**
+ *      i2o_scsi_exit - SCSI OSM exit function
+ *
+ *      Unregisters SCSI OSM from I2O core.
+ */
+static void __exit i2o_scsi_exit(void)
+{
+        /* Unregister I2O SCSI OSM from I2O core */
+        i2o_driver_unregister(&i2o_scsi_driver);
+};
+
+MODULE_AUTHOR("Red Hat Software");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(OSM_DESCRIPTION);
+MODULE_VERSION(OSM_VERSION);
+
+module_init(i2o_scsi_init);
+module_exit(i2o_scsi_exit);