patch-2.4.22 linux-2.4.22/drivers/acorn/scsi/scsi.h

• Lines: 124
• Date: 2003-08-25 04:44:40.000000000 -0700
• Orig file: linux-2.4.21/drivers/acorn/scsi/scsi.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/drivers/acorn/scsi/scsi.h linux-2.4.22/drivers/acorn/scsi/scsi.h
@@ -0,0 +1,123 @@
+/*
+ *  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->address = 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 = (unsigned char *)SCp->buffer->address;
+		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 *) SCpnt->SCp.buffer->address;
+		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->host->host_no,
+			       '0' + SCpnt->target, 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;
+	}
+}
+
+static inline struct Scsi_Host *scsi_host_hn_get(int host_no)
+{
+	struct Scsi_Host *host = scsi_hostlist;
+
+	while (host) {
+		if (host->host_no == host_no)
+			break;
+		host = host->next;
+	}
+
+	return host;
+}