patch-2.3.16 linux/include/asm-sh/io.h

• Lines: 159
• Date: Mon Aug 30 18:12:59 1999
• Orig file: v2.3.15/linux/include/asm-sh/io.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.15/linux/include/asm-sh/io.h linux/include/asm-sh/io.h
@@ -0,0 +1,158 @@
+#ifndef __ASM_SH_IO_H
+#define __ASM_SH_IO_H
+/* XXXXXXXXXXXXXXXXX */
+
+#define virt_to_bus virt_to_phys
+#define bus_to_virt phys_to_virt
+
+extern __inline__ unsigned long readb(unsigned long addr)
+{
+       return *(volatile unsigned char*)addr;
+}
+
+extern __inline__ unsigned long readw(unsigned long addr)
+{
+       return *(volatile unsigned short*)addr;
+}
+
+extern __inline__ unsigned long readl(unsigned long addr)
+{
+       return *(volatile unsigned long*)addr;
+}
+
+extern __inline__ void writeb(unsigned short b, unsigned long addr)
+{
+       *(volatile unsigned char*)addr = b;
+}
+
+extern __inline__ void writew(unsigned short b, unsigned long addr)
+{
+       *(volatile unsigned short*)addr = b;
+}
+
+extern __inline__ void writel(unsigned int b, unsigned long addr)
+{
+        *(volatile unsigned long*)addr = b;
+}
+
+extern __inline__ unsigned long inb_local(unsigned long addr)
+{
+       return readb(addr);
+}
+
+extern __inline__ void outb_local(unsigned char b, unsigned long addr)
+{
+       return writeb(b,addr);
+}
+
+extern __inline__ unsigned long inb(unsigned long addr)
+{
+       return readb(addr);
+}
+
+extern __inline__ unsigned long inw(unsigned long addr)
+{
+       return readw(addr);
+}
+
+extern __inline__ unsigned long inl(unsigned long addr)
+{
+       return readl(addr);
+}
+
+extern __inline__ void outb(unsigned char b, unsigned long addr)
+{
+       return writeb(b,addr);
+}
+
+extern __inline__ void outw(unsigned short b, unsigned long addr)
+{
+       return writew(b,addr);
+}
+
+extern __inline__ void outl(unsigned int b, unsigned long addr)
+{
+       return writel(b,addr);
+}
+
+#define inb_p inb
+#define outb_p outb
+
+#ifdef __KERNEL__
+
+#include <asm/addrspace.h>
+
+/*
+ * Change virtual addresses to physical addresses and vv.
+ * These are trivial on the 1:1 Linux/SuperH mapping
+ */
+extern __inline__ unsigned long virt_to_phys(volatile void * address)
+{
+	return PHYSADDR(address);
+}
+
+extern __inline__ void * phys_to_virt(unsigned long address)
+{
+	return (void *)KSEG0ADDR(address);
+}
+
+extern void * ioremap(unsigned long phys_addr, unsigned long size);
+extern void iounmap(void *addr);
+
+/*
+ * readX/writeX() are used to access memory mapped devices. On some
+ * architectures the memory mapped IO stuff needs to be accessed
+ * differently. On the x86 architecture, we just read/write the
+ * memory location directly.
+ *
+ * On SH, we have the whole physical address space mapped at all times
+ * (as MIPS does), so "ioremap()" and "iounmap()" do not need to do
+ * anything.  (This isn't true for all machines but we still handle
+ * these cases with wired TLB entries anyway ...)
+ *
+ * We cheat a bit and always return uncachable areas until we've fixed
+ * the drivers to handle caching properly.  
+ */
+extern __inline__ void * ioremap(unsigned long offset, unsigned long size)
+{
+	return (void *) KSEG1ADDR(offset);
+}
+
+/*
+ * This one maps high address device memory and turns off caching for that area.
+ * it's useful if some control registers are in such an area and write combining
+ * or read caching is not desirable:
+ */
+extern __inline__ void * ioremap_nocache (unsigned long offset, unsigned long size)
+{
+	return (void *) KSEG1ADDR(offset);
+}
+
+extern __inline__ void iounmap(void *addr)
+{
+}
+
+static __inline__ int check_signature(unsigned long io_addr,
+			const unsigned char *signature, int length)
+{
+	int retval = 0;
+	do {
+		if (readb(io_addr) != *signature)
+			goto out;
+		io_addr++;
+		signature++;
+		length--;
+	} while (length);
+	retval = 1;
+out:
+	return retval;
+}
+
+/* Nothing to do */
+
+#define dma_cache_inv(_start,_size)		do { } while (0)
+#define dma_cache_wback(_start,_size)		do { } while (0)
+#define dma_cache_wback_inv(_start,_size)	do { } while (0)
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_SH_IO_H */