patch-2.1.44 linux/arch/mips/jazz/io.c

• Lines: 137
• Date: Thu Jun 26 12:33:37 1997
• Orig file: v2.1.43/linux/arch/mips/jazz/io.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.43/linux/arch/mips/jazz/io.c linux/arch/mips/jazz/io.c
@@ -0,0 +1,136 @@
+/*
+ * 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 <asm/mipsconfig.h>
+#include <asm/addrspace.h>
+#include <asm/system.h>
+#include <asm/spinlock.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;
+	}
+}