patch-2.4.19 linux-2.4.19/arch/ia64/sn/kernel/sn1/iomv.c

• Lines: 66
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/ia64/sn/kernel/sn1/iomv.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/ia64/sn/kernel/sn1/iomv.c linux-2.4.19/arch/ia64/sn/kernel/sn1/iomv.c
@@ -0,0 +1,65 @@
+/* 
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2000-2002 Silicon Graphics, Inc. All rights reserved.
+ */
+
+#include <linux/pci.h>
+#include <asm/io.h>
+#include <asm/sn/simulator.h>
+#include <asm/delay.h>
+#include <asm/sn/pda.h>
+
+/**
+ * sn_io_addr - convert an in/out port to an i/o address
+ * @port: port to convert
+ *
+ * Legacy in/out instructions are converted to ld/st instructions
+ * on IA64.  This routine will convert a port number into a valid 
+ * SN i/o address.  Used by sn_in*() and sn_out*().
+ */
+void *
+sn_io_addr(unsigned long port)
+{
+	if (!IS_RUNNING_ON_SIMULATOR()) {
+		return( (void *)  (port | __IA64_UNCACHED_OFFSET));
+	} else {
+		unsigned long io_base;
+		unsigned long addr;
+ 
+		/*
+ 		 * word align port, but need more than 10 bits
+ 		 * for accessing registers in bedrock local block
+ 		 * (so we don't do port&0xfff)
+ 		 */
+		if ((port >= 0x1f0 && port <= 0x1f7) ||
+			port == 0x3f6 || port == 0x3f7) {
+			io_base = __IA64_UNCACHED_OFFSET | 0x00000FFFFC000000;
+			addr = io_base | ((port >> 2) << 12) | (port & 0xfff);
+		} else {
+			addr = __ia64_get_io_port_base() | ((port >> 2) << 2);
+		}
+		return(void *) addr;
+	}
+}
+
+/**
+ * sn1_mmiob - I/O space memory barrier
+ *
+ * Acts as a memory mapped I/O barrier for platforms that queue writes to 
+ * I/O space.  This ensures that subsequent writes to I/O space arrive after
+ * all previous writes.  For most ia64 platforms, this is a simple
+ * 'mf.a' instruction.  For other platforms, mmiob() may have to read
+ * a chipset register to ensure ordering.
+ *
+ * On SN1, we wait for the PIO_WRITE_STATUS Bedrock register to clear.
+ */
+void
+sn1_mmiob (void)
+{
+	(volatile unsigned long) (*pda.bedrock_rev_id);
+	while (!(volatile unsigned long) (*pda.pio_write_status_addr))
+		udelay(5);
+}