1 files changed, 115 insertions, 0 deletions

diff --git a/drivers/scsi/arm/scsi.h b/drivers/scsi/arm/scsi.h
new file mode 100644
index 000000000000..2f1b3f4bf954
--- /dev/null
+++ b/drivers/scsi/arm/scsi.h
@@ -0,0 +1,115 @@
+/*
+ *  linux/drivers/acorn/scsi/scsi.h
+ *
+ *  Copyright (C) 2002 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.
+ *
+ *  Commonly used scsi driver functions.
+ */
+
+#define BELT_AND_BRACES
+
+/*
+ * The scatter-gather list handling.  This contains all
+ * the yucky stuff that needs to be fixed properly.
+ */
+static inline int copy_SCp_to_sg(struct scatterlist *sg, Scsi_Pointer *SCp, int max)
+{
+        int bufs = SCp->buffers_residual;
+
+        BUG_ON(bufs + 1 > max);
+
+        sg->page   = virt_to_page(SCp->ptr);
+        sg->offset = offset_in_page(SCp->ptr);
+        sg->length = SCp->this_residual;
+
+        if (bufs)
+                memcpy(sg + 1, SCp->buffer + 1,
+                       sizeof(struct scatterlist) * bufs);
+        return bufs + 1;
+}
+
+static inline int next_SCp(Scsi_Pointer *SCp)
+{
+        int ret = SCp->buffers_residual;
+        if (ret) {
+                SCp->buffer++;
+                SCp->buffers_residual--;
+                SCp->ptr = (char *)
+                         (page_address(SCp->buffer->page) +
+                          SCp->buffer->offset);
+                SCp->this_residual = SCp->buffer->length;
+        } else {
+                SCp->ptr = NULL;
+                SCp->this_residual = 0;
+        }
+        return ret;
+}
+
+static inline unsigned char get_next_SCp_byte(Scsi_Pointer *SCp)
+{
+        char c = *SCp->ptr;
+
+        SCp->ptr += 1;
+        SCp->this_residual -= 1;
+
+        return c;
+}
+
+static inline void put_next_SCp_byte(Scsi_Pointer *SCp, unsigned char c)
+{
+        *SCp->ptr = c;
+        SCp->ptr += 1;
+        SCp->this_residual -= 1;
+}
+
+static inline void init_SCp(Scsi_Cmnd *SCpnt)
+{
+        memset(&SCpnt->SCp, 0, sizeof(struct scsi_pointer));
+
+        if (SCpnt->use_sg) {
+                unsigned long len = 0;
+                int buf;
+
+                SCpnt->SCp.buffer = (struct scatterlist *) SCpnt->buffer;
+                SCpnt->SCp.buffers_residual = SCpnt->use_sg - 1;
+                SCpnt->SCp.ptr = (char *)
+                         (page_address(SCpnt->SCp.buffer->page) +
+                          SCpnt->SCp.buffer->offset);
+                SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;
+
+#ifdef BELT_AND_BRACES
+                /*
+                 * Calculate correct buffer length.  Some commands
+                 * come in with the wrong request_bufflen.
+                 */
+                for (buf = 0; buf <= SCpnt->SCp.buffers_residual; buf++)
+                        len += SCpnt->SCp.buffer[buf].length;
+
+                if (SCpnt->request_bufflen != len)
+                        printk(KERN_WARNING "scsi%d.%c: bad request buffer "
+                               "length %d, should be %ld\n", SCpnt->device->host->host_no,
+                               '0' + SCpnt->device->id, SCpnt->request_bufflen, len);
+                SCpnt->request_bufflen = len;
+#endif
+        } else {
+                SCpnt->SCp.ptr = (unsigned char *)SCpnt->request_buffer;
+                SCpnt->SCp.this_residual = SCpnt->request_bufflen;
+        }
+
+        /*
+         * If the upper SCSI layers pass a buffer, but zero length,
+         * we aren't interested in the buffer pointer.
+         */
+        if (SCpnt->SCp.this_residual == 0 && SCpnt->SCp.ptr) {
+#if 0 //def BELT_AND_BRACES
+                printk(KERN_WARNING "scsi%d.%c: zero length buffer passed for "
+                       "command ", SCpnt->host->host_no, '0' + SCpnt->target);
+                print_command(SCpnt->cmnd);
+#endif
+                SCpnt->SCp.ptr = NULL;
+        }
+}