1 files changed, 135 insertions, 0 deletions

diff --git a/arch/mips/jazz/io.c b/arch/mips/jazz/io.c
new file mode 100644
index 00000000000..e86904454c8
--- /dev/null
+++ b/arch/mips/jazz/io.c
@@ -0,0 +1,135 @@
+/*
+ * 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.
+ *
+ * Low level I/O functions for Jazz family machines.
+ *
+ * Copyright (C) 1997 by Ralf Baechle.
+ */
+#include <linux/string.h>
+#include <linux/spinlock.h>
+#include <asm/addrspace.h>
+#include <asm/system.h>
+#include <asm/jazz.h>
+
+/*
+ * Map an 16mb segment of the EISA address space to 0xe3000000;
+ */
+static inline void map_eisa_address(unsigned long address)
+{
+  /* XXX */
+  /* We've got an wired entry in the TLB.  We just need to modify it.
+     fast and clean.  But since we want to get rid of wired entries
+     things are a little bit more complicated ... */
+}
+
+static unsigned char jazz_readb(unsigned long addr)
+{
+        unsigned char res;
+
+        map_eisa_address(addr);
+        addr &= 0xffffff;
+        res = *(volatile unsigned char *) (JAZZ_EISA_BASE + addr);
+
+        return res;
+}
+
+static unsigned short jazz_readw(unsigned long addr)
+{
+        unsigned short res;
+
+        map_eisa_address(addr);
+        addr &= 0xffffff;
+        res = *(volatile unsigned char *) (JAZZ_EISA_BASE + addr);
+
+        return res;
+}
+
+static unsigned int jazz_readl(unsigned long addr)
+{
+        unsigned int res;
+
+        map_eisa_address(addr);
+        addr &= 0xffffff;
+        res = *(volatile unsigned char *) (JAZZ_EISA_BASE + addr);
+
+        return res;
+}
+
+static void jazz_writeb(unsigned char val, unsigned long addr)
+{
+        map_eisa_address(addr);
+        addr &= 0xffffff;
+        *(volatile unsigned char *) (JAZZ_EISA_BASE + addr) = val;
+}
+
+static void jazz_writew(unsigned short val, unsigned long addr)
+{
+        map_eisa_address(addr);
+        addr &= 0xffffff;
+        *(volatile unsigned char *) (JAZZ_EISA_BASE + addr) = val;
+}
+
+static void jazz_writel(unsigned int val, unsigned long addr)
+{
+        map_eisa_address(addr);
+        addr &= 0xffffff;
+        *(volatile unsigned char *) (JAZZ_EISA_BASE + addr) = val;
+}
+
+static void jazz_memset_io(unsigned long addr, int val, unsigned long len)
+{
+        unsigned long waddr;
+
+        waddr = JAZZ_EISA_BASE | (addr & 0xffffff);
+        while(len) {
+                unsigned long fraglen;
+
+                fraglen = (~addr + 1) & 0xffffff;
+                fraglen = (fraglen < len) ? fraglen : len;
+                map_eisa_address(addr);
+                memset((char *)waddr, val, fraglen);
+                addr += fraglen;
+                waddr = waddr + fraglen - 0x1000000;
+                len -= fraglen;
+        }
+}
+
+static void jazz_memcpy_fromio(unsigned long to, unsigned long from, unsigned long len)
+{
+        unsigned long waddr;
+
+        waddr = JAZZ_EISA_BASE | (from & 0xffffff);
+        while(len) {
+                unsigned long fraglen;
+
+                fraglen = (~from + 1) & 0xffffff;
+                fraglen = (fraglen < len) ? fraglen : len;
+                map_eisa_address(from);
+                memcpy((void *)to, (void *)waddr, fraglen);
+                to += fraglen;
+                from += fraglen;
+                waddr = waddr + fraglen - 0x1000000;
+                len -= fraglen;
+        }
+}
+
+static void jazz_memcpy_toio(unsigned long to, unsigned long from, unsigned long len)
+{
+        unsigned long waddr;
+
+        waddr = JAZZ_EISA_BASE | (to & 0xffffff);
+        while(len) {
+                unsigned long fraglen;
+
+                fraglen = (~to + 1) & 0xffffff;
+                fraglen = (fraglen < len) ? fraglen : len;
+                map_eisa_address(to);
+                memcpy((char *)to + JAZZ_EISA_BASE, (void *)from, fraglen);
+                to += fraglen;
+                from += fraglen;
+                waddr = waddr + fraglen - 0x1000000;
+                len -= fraglen;
+        }
+}