1 files changed, 70 insertions, 0 deletions
diff --git a/arch/ia64/sn/kernel/iomv.c b/arch/ia64/sn/kernel/iomv.c
new file mode 100644
index 000000000000..fec6d8b8237b
--- /dev/null
+++ b/arch/ia64/sn/kernel/iomv.c
@@ -0,0 +1,70 @@
+/* 
+ * 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) 2000-2003 Silicon Graphics, Inc. All rights reserved.
+ */
+
+#include <linux/module.h>
+#include <asm/io.h>
+#include <asm/delay.h>
+#include <asm/sn/nodepda.h>
+#include <asm/sn/simulator.h>
+#include <asm/sn/pda.h>
+#include <asm/sn/sn_cpuid.h>
+#include <asm/sn/shub_mmr.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()) {
+		/* On sn2, legacy I/O ports don't point at anything */
+		if (port < (64 * 1024))
+			return NULL;
+		return ((void *)(port | __IA64_UNCACHED_OFFSET));
+	} else {
+		/* but the simulator uses them... */
+		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)
+		 */
+		addr = (is_shub2() ? 0xc00000028c000000UL : 0xc0000087cc000000UL) | ((port >> 2) << 12);
+		if ((port >= 0x1f0 && port <= 0x1f7) || port == 0x3f6 || port == 0x3f7)
+			addr |= port;
+		return (void *)addr;
+	}
+}
+
+EXPORT_SYMBOL(sn_io_addr);
+
+/**
+ * __sn_mmiowb - I/O space memory barrier
+ *
+ * See include/asm-ia64/io.h and Documentation/DocBook/deviceiobook.tmpl
+ * for details.
+ *
+ * On SN2, we wait for the PIO_WRITE_STATUS SHub register to clear.
+ * See PV 871084 for details about the WAR about zero value.
+ *
+ */
+void __sn_mmiowb(void)
+{
+	volatile unsigned long *adr = pda->pio_write_status_addr;
+	unsigned long val = pda->pio_write_status_val;
+
+	while ((*adr & SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK) != val)
+		cpu_relax();
+}
+
+EXPORT_SYMBOL(__sn_mmiowb);