1 files changed, 171 insertions, 0 deletions

diff --git a/drivers/scsi/arm/msgqueue.c b/drivers/scsi/arm/msgqueue.c
new file mode 100644
index 000000000000..7c95c7582b29
--- /dev/null
+++ b/drivers/scsi/arm/msgqueue.c
@@ -0,0 +1,171 @@
+/*
+ *  linux/drivers/acorn/scsi/msgqueue.c
+ *
+ *  Copyright (C) 1997-1998 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  message queue handling
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/stddef.h>
+#include <linux/init.h>
+
+#include "msgqueue.h"
+
+/*
+ * Function: struct msgqueue_entry *mqe_alloc(MsgQueue_t *msgq)
+ * Purpose : Allocate a message queue entry
+ * Params  : msgq - message queue to claim entry for
+ * Returns : message queue entry or NULL.
+ */
+static struct msgqueue_entry *mqe_alloc(MsgQueue_t *msgq)
+{
+        struct msgqueue_entry *mq;
+
+        if ((mq = msgq->free) != NULL)
+                msgq->free = mq->next;
+
+        return mq;
+}
+
+/*
+ * Function: void mqe_free(MsgQueue_t *msgq, struct msgqueue_entry *mq)
+ * Purpose : free a message queue entry
+ * Params  : msgq - message queue to free entry from
+ *           mq   - message queue entry to free
+ */
+static void mqe_free(MsgQueue_t *msgq, struct msgqueue_entry *mq)
+{
+        if (mq) {
+                mq->next = msgq->free;
+                msgq->free = mq;
+        }
+}
+
+/*
+ * Function: void msgqueue_initialise(MsgQueue_t *msgq)
+ * Purpose : initialise a message queue
+ * Params  : msgq - queue to initialise
+ */
+void msgqueue_initialise(MsgQueue_t *msgq)
+{
+        int i;
+
+        msgq->qe = NULL;
+        msgq->free = &msgq->entries[0];
+
+        for (i = 0; i < NR_MESSAGES; i++)
+                msgq->entries[i].next = &msgq->entries[i + 1];
+
+        msgq->entries[NR_MESSAGES - 1].next = NULL;
+}
+
+
+/*
+ * Function: void msgqueue_free(MsgQueue_t *msgq)
+ * Purpose : free a queue
+ * Params  : msgq - queue to free
+ */
+void msgqueue_free(MsgQueue_t *msgq)
+{
+}
+
+/*
+ * Function: int msgqueue_msglength(MsgQueue_t *msgq)
+ * Purpose : calculate the total length of all messages on the message queue
+ * Params  : msgq - queue to examine
+ * Returns : number of bytes of messages in queue
+ */
+int msgqueue_msglength(MsgQueue_t *msgq)
+{
+        struct msgqueue_entry *mq = msgq->qe;
+        int length = 0;
+
+        for (mq = msgq->qe; mq; mq = mq->next)
+                length += mq->msg.length;
+
+        return length;
+}
+
+/*
+ * Function: struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno)
+ * Purpose : return a message
+ * Params  : msgq   - queue to obtain message from
+ *         : msgno  - message number
+ * Returns : pointer to message string, or NULL
+ */
+struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno)
+{
+        struct msgqueue_entry *mq;
+
+        for (mq = msgq->qe; mq && msgno; mq = mq->next, msgno--);
+
+        return mq ? &mq->msg : NULL;
+}
+
+/*
+ * Function: int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...)
+ * Purpose : add a message onto a message queue
+ * Params  : msgq   - queue to add message on
+ *           length - length of message
+ *           ...    - message bytes
+ * Returns : != 0 if successful
+ */
+int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...)
+{
+        struct msgqueue_entry *mq = mqe_alloc(msgq);
+        va_list ap;
+
+        if (mq) {
+                struct msgqueue_entry **mqp;
+                int i;
+
+                va_start(ap, length);
+                for (i = 0; i < length; i++)
+                        mq->msg.msg[i] = va_arg(ap, unsigned int);
+                va_end(ap);
+
+                mq->msg.length = length;
+                mq->msg.fifo = 0;
+                mq->next = NULL;
+
+                mqp = &msgq->qe;
+                while (*mqp)
+                        mqp = &(*mqp)->next;
+
+                *mqp = mq;
+        }
+
+        return mq != NULL;
+}
+
+/*
+ * Function: void msgqueue_flush(MsgQueue_t *msgq)
+ * Purpose : flush all messages from message queue
+ * Params  : msgq - queue to flush
+ */
+void msgqueue_flush(MsgQueue_t *msgq)
+{
+        struct msgqueue_entry *mq, *mqnext;
+
+        for (mq = msgq->qe; mq; mq = mqnext) {
+                mqnext = mq->next;
+                mqe_free(msgq, mq);
+        }
+        msgq->qe = NULL;
+}
+
+EXPORT_SYMBOL(msgqueue_initialise);
+EXPORT_SYMBOL(msgqueue_free);
+EXPORT_SYMBOL(msgqueue_msglength);
+EXPORT_SYMBOL(msgqueue_getmsg);
+EXPORT_SYMBOL(msgqueue_addmsg);
+EXPORT_SYMBOL(msgqueue_flush);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("SCSI message queue handling");
+MODULE_LICENSE("GPL");