patch-2.4.22 linux-2.4.22/include/asm-sh64/io.h

• Lines: 218
• Date: 2003-08-25 04:44:44.000000000 -0700
• Orig file: linux-2.4.21/include/asm-sh64/io.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/include/asm-sh64/io.h linux-2.4.22/include/asm-sh64/io.h
@@ -0,0 +1,217 @@
+#ifndef __ASM_SH64_IO_H
+#define __ASM_SH64_IO_H
+
+/*
+ * 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.
+ *
+ * include/asm-sh64/io.h
+ *
+ * Copyright (C) 2000, 2001  Paolo Alberelli
+ * Copyright (C) 2003  Paul Mundt
+ *
+ */
+
+/*
+ * Convention:
+ *    read{b,w,l}/write{b,w,l} are for PCI,
+ *    while in{b,w,l}/out{b,w,l} are for ISA
+ * These may (will) be platform specific function.
+ *
+ * In addition, we have 
+ *   ctrl_in{b,w,l}/ctrl_out{b,w,l} for SuperH specific I/O.
+ * which are processor specific. Address should be the result of
+ * onchip_remap();
+ */
+
+#include <asm/cache.h>
+#include <asm/system.h>
+
+#define virt_to_bus virt_to_phys
+#define bus_to_virt phys_to_virt
+#define page_to_bus page_to_phys
+
+/*
+ * Nothing overly special here.. instead of doing the same thing
+ * over and over again, we just define a set of sh64_in/out functions
+ * with an implicit size. The traditional read{b,w,l}/write{b,w,l}
+ * mess is wrapped to this, as are the SH-specific ctrl_in/out routines.
+ */
+static inline unsigned char sh64_in8(unsigned long addr)
+{
+	return *(volatile unsigned char *)addr;
+}
+
+static inline unsigned short sh64_in16(unsigned long addr)
+{
+	return *(volatile unsigned short *)addr;
+}
+
+static inline unsigned long sh64_in32(unsigned long addr)
+{
+	return *(volatile unsigned long *)addr;
+}
+
+static inline unsigned long long sh64_in64(unsigned long addr)
+{
+	return *(volatile unsigned long long *)addr;
+}
+
+static inline void sh64_out8(unsigned char b, unsigned long addr)
+{
+	*(volatile unsigned char *)addr = b;
+	wmb();
+}
+
+static inline void sh64_out16(unsigned short b, unsigned long addr)
+{
+	*(volatile unsigned short *)addr = b;
+	wmb();
+}
+
+static inline void sh64_out32(unsigned long b, unsigned long addr)
+{
+	*(volatile unsigned long *)addr = b;
+	wmb();
+}
+
+static inline void sh64_out64(unsigned long long b, unsigned long addr)
+{
+	*(volatile unsigned long long *)addr = b;
+	wmb();
+}
+
+#define readb(addr)		sh64_in8(addr)
+#define readw(addr)		sh64_in16(addr)
+#define readl(addr)		sh64_in32(addr)
+
+#define writeb(b, addr)		sh64_out8(b, addr)
+#define writew(b, addr)		sh64_out16(b, addr)
+#define writel(b, addr)		sh64_out32(b, addr)
+
+#define ctrl_inb(addr)		sh64_in8(addr)
+#define ctrl_inw(addr)		sh64_in16(addr)
+#define ctrl_inl(addr)		sh64_in32(addr)
+
+#define ctrl_outb(b, addr)	sh64_out8(b, addr)
+#define ctrl_outw(b, addr)	sh64_out16(b, addr)
+#define ctrl_outl(b, addr)	sh64_out32(b, addr)
+
+unsigned long inb(unsigned long port);
+unsigned long inw(unsigned long port);
+unsigned long inl(unsigned long port);
+void outb(unsigned long value, unsigned long port);
+void outw(unsigned long value, unsigned long port);
+void outl(unsigned long value, unsigned long port);
+
+#ifdef __KERNEL__
+
+#define IO_SPACE_LIMIT 0xffffffff
+
+/*
+ * 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 __pa(address);
+}
+
+extern __inline__ void * phys_to_virt(unsigned long address)
+{
+	return __va(address);
+}
+
+extern void * __ioremap(unsigned long phys_addr, unsigned long size,
+			unsigned long flags);
+
+extern __inline__ void * ioremap(unsigned long phys_addr, unsigned long size)
+{
+	return __ioremap(phys_addr, size, 1);
+}
+	
+extern __inline__ void * ioremap_nocache (unsigned long phys_addr, unsigned long size)
+{
+	return __ioremap(phys_addr, size, 0);
+}
+
+extern void iounmap(void *addr);
+
+unsigned long onchip_remap(unsigned long addr, unsigned long size, const char* name);
+extern void onchip_unmap(unsigned long vaddr);
+
+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;
+}
+
+/*
+ * The caches on some architectures aren't dma-coherent and have need to
+ * handle this in software.  There are three types of operations that
+ * can be applied to dma buffers.
+ *
+ *  - dma_cache_wback_inv(start, size) makes caches and RAM coherent by
+ *    writing the content of the caches back to memory, if necessary.
+ *    The function also invalidates the affected part of the caches as
+ *    necessary before DMA transfers from outside to memory.
+ *  - dma_cache_inv(start, size) invalidates the affected parts of the
+ *    caches.  Dirty lines of the caches may be written back or simply
+ *    be discarded.  This operation is necessary before dma operations
+ *    to the memory.
+ *  - dma_cache_wback(start, size) writes back any dirty lines but does
+ *    not invalidate the cache.  This can be used before DMA reads from
+ *    memory,
+ */
+
+/*
+ * Implemented despite DMA is not yet supported on ST50.
+ *
+ * Also note that PCI DMA is supposed to be cache coherent,
+ * therefore these should not be used by PCI device drivers.
+ *
+ */
+
+static __inline__ void dma_cache_wback_inv (unsigned long start, unsigned long size)
+{
+	unsigned long s = start & L1_CACHE_ALIGN_MASK;
+	unsigned long e = (start + size) & L1_CACHE_ALIGN_MASK;
+
+	for (; s <= e; s += L1_CACHE_BYTES)
+		asm volatile ("ocbp	%0, 0" : : "r" (s));
+}
+
+static __inline__ void dma_cache_inv (unsigned long start, unsigned long size)
+{
+	// Note that caller has to be careful with overzealous
+	// invalidation should there be partial cache lines at the extremities 
+	// of the specified range 
+	unsigned long s = start & L1_CACHE_ALIGN_MASK;
+	unsigned long e = (start + size) & L1_CACHE_ALIGN_MASK;
+
+	for (; s <= e; s += L1_CACHE_BYTES)
+		asm volatile ("ocbi	%0, 0" : : "r" (s));
+}
+
+static __inline__ void dma_cache_wback (unsigned long start, unsigned long size)
+{
+	unsigned long s = start & L1_CACHE_ALIGN_MASK;
+	unsigned long e = (start + size) & L1_CACHE_ALIGN_MASK;
+
+	for (; s <= e; s += L1_CACHE_BYTES)
+		asm volatile ("ocbwb	%0, 0" : : "r" (s));
+}
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_SH64_IO_H */