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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/mips/jazz/io.c
downloadlinux-stericsson-9e734775f7c22d2f89943ad6c745571f1930105f.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/mips/jazz/io.c')
-rw-r--r--arch/mips/jazz/io.c135
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 000000000000..e86904454c89
--- /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;
+ }
+}