patch-2.3.43 linux/include/asm-ia64/io.h

• Lines: 447
• Date: Sun Feb 6 18:42:40 2000
• Orig file: v2.3.42/linux/include/asm-ia64/io.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.42/linux/include/asm-ia64/io.h linux/include/asm-ia64/io.h
@@ -0,0 +1,446 @@
+#ifndef _ASM_IA64_IO_H
+#define _ASM_IA64_IO_H
+
+/*
+ * This file contains the definitions for the emulated IO instructions
+ * inb/inw/inl/outb/outw/outl and the "string versions" of the same
+ * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
+ * versions of the single-IO instructions (inb_p/inw_p/..).
+ *
+ * This file is not meant to be obfuscating: it's just complicated to
+ * (a) handle it all in a way that makes gcc able to optimize it as
+ * well as possible and (b) trying to avoid writing the same thing
+ * over and over again with slight variations and possibly making a
+ * mistake somewhere.
+ *
+ * Copyright (C) 1998, 1999 Hewlett-Packard Co
+ * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
+ * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
+ */
+
+/* We don't use IO slowdowns on the ia64, but.. */
+#define __SLOW_DOWN_IO	do { } while (0)
+#define SLOW_DOWN_IO	do { } while (0)
+
+#define __IA64_UNCACHED_OFFSET	0xc000000000000000	/* region 6 */
+
+#define IO_SPACE_LIMIT 0xffff
+
+# ifdef __KERNEL__
+
+#include <asm/page.h>
+#include <asm/system.h>
+
+/*
+ * Change virtual addresses to physical addresses and vv.
+ */
+static inline unsigned long
+virt_to_phys (volatile void *address)
+{
+	return (unsigned long) address - PAGE_OFFSET;
+}
+
+static inline void*
+phys_to_virt(unsigned long address)
+{
+	return (void *) (address + PAGE_OFFSET);
+}
+
+#define bus_to_virt	phys_to_virt
+#define virt_to_bus	virt_to_phys
+
+# else /* !KERNEL */
+# endif /* !KERNEL */
+
+/*
+ * Memory fence w/accept.  This should never be used in code that is
+ * not IA-64 specific.
+ */
+#define __ia64_mf_a()	__asm__ __volatile__ ("mf.a" ::: "memory")
+
+extern inline const unsigned long
+__ia64_get_io_port_base (void)
+{
+	unsigned long addr;
+
+	__asm__ ("mov %0=ar.k0;;" : "=r"(addr));
+	return __IA64_UNCACHED_OFFSET | addr;
+}
+
+extern inline void*
+__ia64_mk_io_addr (unsigned long port)
+{
+	const unsigned long io_base = __ia64_get_io_port_base();
+	unsigned long addr;
+
+	addr = io_base | ((port >> 2) << 12) | (port & 0xfff);
+	return (void *) addr;
+}
+
+/*
+ * For the in/out instructions, we need to do:
+ *
+ *	o "mf" _before_ doing the I/O access to ensure that all prior
+ *	  accesses to memory occur before the I/O access
+ *	o "mf.a" _after_ doing the I/O access to ensure that the access
+ *	  has completed before we're doing any other I/O accesses
+ *
+ * The former is necessary because we might be doing normal (cached) memory
+ * accesses, e.g., to set up a DMA descriptor table and then do an "outX()"
+ * to tell the DMA controller to start the DMA operation.  The "mf" ahead
+ * of the I/O operation ensures that the DMA table is correct when the I/O
+ * access occurs.
+ *
+ * The mf.a is necessary to ensure that all I/O access occur in program
+ * order. --davidm 99/12/07 
+ */
+
+extern inline unsigned int
+__inb (unsigned long port)
+{
+	volatile unsigned char *addr = __ia64_mk_io_addr(port);
+	unsigned char ret;
+
+	ret = *addr;
+	__ia64_mf_a();
+	return ret;
+}
+
+extern inline unsigned int
+__inw (unsigned long port)
+{
+	volatile unsigned short *addr = __ia64_mk_io_addr(port);
+	unsigned short ret;
+
+	ret = *addr;
+	__ia64_mf_a();
+	return ret;
+}
+
+extern inline unsigned int
+__inl (unsigned long port)
+{
+	volatile unsigned int *addr = __ia64_mk_io_addr(port);
+	unsigned int ret;
+
+	ret = *addr;
+	__ia64_mf_a();
+	return ret;
+}
+
+extern inline void
+__insb (unsigned long port, void *dst, unsigned long count)
+{
+	volatile unsigned char *addr = __ia64_mk_io_addr(port);
+	unsigned char *dp = dst;
+
+	__ia64_mf_a();
+	while (count--) {
+		*dp++ = *addr;
+	}
+	__ia64_mf_a();
+	return;
+}
+
+extern inline void
+__insw (unsigned long port, void *dst, unsigned long count)
+{
+	volatile unsigned short *addr = __ia64_mk_io_addr(port);
+	unsigned short *dp = dst;
+
+	__ia64_mf_a();
+	while (count--) {
+		*dp++ = *addr;
+	}
+	__ia64_mf_a();
+	return;
+}
+
+extern inline void
+__insl (unsigned long port, void *dst, unsigned long count)
+{
+	volatile unsigned int *addr = __ia64_mk_io_addr(port);
+	unsigned int *dp = dst;
+
+	__ia64_mf_a();
+	while (count--) {
+		*dp++ = *addr;
+	}
+	__ia64_mf_a();
+	return;
+}
+
+extern inline void
+__outb (unsigned char val, unsigned long port)
+{
+	volatile unsigned char *addr = __ia64_mk_io_addr(port);
+
+	*addr = val;
+	__ia64_mf_a();
+}
+
+extern inline void
+__outw (unsigned short val, unsigned long port)
+{
+	volatile unsigned short *addr = __ia64_mk_io_addr(port);
+
+	*addr = val;
+	__ia64_mf_a();
+}
+
+extern inline void
+__outl (unsigned int val, unsigned long port)
+{
+	volatile unsigned int *addr = __ia64_mk_io_addr(port);
+
+	*addr = val;
+	__ia64_mf_a();
+}
+
+extern inline void
+__outsb (unsigned long port, const void *src, unsigned long count)
+{
+	volatile unsigned char *addr = __ia64_mk_io_addr(port);
+	const unsigned char *sp = src;
+
+	while (count--) {
+		*addr = *sp++;
+	}
+	__ia64_mf_a();
+	return;
+}
+
+extern inline void
+__outsw (unsigned long port, const void *src, unsigned long count)
+{
+	volatile unsigned short *addr = __ia64_mk_io_addr(port);
+	const unsigned short *sp = src;
+
+	while (count--) {
+		*addr = *sp++;
+	}
+	__ia64_mf_a();
+	return;
+}
+
+extern inline void
+__outsl (unsigned long port, void *src, unsigned long count)
+{
+	volatile unsigned int *addr = __ia64_mk_io_addr(port);
+	const unsigned int *sp = src;
+
+	while (count--) {
+		*addr = *sp++;
+	}
+	__ia64_mf_a();
+	return;
+}
+
+#define inb		__inb
+#define inw		__inw
+#define inl		__inl
+#define insb		__insb
+#define insw		__insw
+#define insl		__insl
+#define outb		__outb
+#define outw		__outw
+#define outl		__outl
+#define outsb		__outsb
+#define outsw		__outsw
+#define outsl		__outsl
+
+/*
+ * The address passed to these functions are ioremap()ped already.
+ */
+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 int *) addr;
+}
+
+extern inline unsigned long
+__readq (unsigned long addr)
+{
+	return *(volatile unsigned long *) addr;
+}
+
+extern inline void
+__writeb (unsigned char val, unsigned long addr)
+{
+	*(volatile unsigned char *) addr = val;
+}
+
+extern inline void
+__writew (unsigned short val, unsigned long addr)
+{
+	*(volatile unsigned short *) addr = val;
+}
+
+extern inline void
+__writel (unsigned int val, unsigned long addr)
+{
+	*(volatile unsigned int *) addr = val;
+}
+
+extern inline void
+__writeq (unsigned long val, unsigned long addr)
+{
+	*(volatile unsigned long *) addr = val;
+}
+
+#define readb		__readb
+#define readw		__readw
+#define readl		__readl
+#define readq		__readqq
+#define __raw_readb	readb
+#define __raw_readw	readw
+#define __raw_readl	readl
+#define __raw_readq	readq
+#define writeb		__writeb
+#define writew		__writew
+#define writel		__writel
+#define writeq		__writeq
+#define __raw_writeb	writeb
+#define __raw_writew	writew
+#define __raw_writeq	writeq
+
+#ifndef inb_p
+# define inb_p		inb
+#endif
+#ifndef inw_p
+# define inw_p		inw
+#endif
+#ifndef inl_p
+# define inl_p		inl
+#endif
+
+#ifndef outb_p
+# define outb_p		outb
+#endif
+#ifndef outw_p
+# define outw_p		outw
+#endif
+#ifndef outl_p
+# define outl_p		outl
+#endif
+
+/*
+ * An "address" in IO memory space is not clearly either an integer
+ * or a pointer. We will accept both, thus the casts.
+ *
+ * On ia-64, we access the physical I/O memory space through the
+ * uncached kernel region.
+ */
+static inline void *
+ioremap (unsigned long offset, unsigned long size)
+{
+	return (void *) (__IA64_UNCACHED_OFFSET | (offset));
+} 
+
+static inline void
+iounmap (void *addr)
+{
+}
+
+#define ioremap_nocache(o,s)	ioremap(o,s)
+
+# ifdef __KERNEL__
+
+/*
+ * String version of IO memory access ops:
+ */
+extern void __ia64_memcpy_fromio (void *, unsigned long, long);
+extern void __ia64_memcpy_toio (unsigned long, void *, long);
+extern void __ia64_memset_c_io (unsigned long, unsigned long, long);
+
+#define memcpy_fromio(to,from,len) \
+  __ia64_memcpy_fromio((to),(unsigned long)(from),(len))
+#define memcpy_toio(to,from,len) \
+  __ia64_memcpy_toio((unsigned long)(to),(from),(len))
+#define memset_io(addr,c,len) \
+  __ia64_memset_c_io((unsigned long)(addr),0x0101010101010101UL*(u8)(c),(len))
+
+#define __HAVE_ARCH_MEMSETW_IO
+#define memsetw_io(addr,c,len) \
+  _memset_c_io((unsigned long)(addr),0x0001000100010001UL*(u16)(c),(len))
+
+/*
+ * XXX - We don't have csum_partial_copy_fromio() yet, so we cheat here and 
+ * just copy it. The net code will then do the checksum later. Presently 
+ * only used by some shared memory 8390 Ethernet cards anyway.
+ */
+
+#define eth_io_copy_and_sum(skb,src,len,unused)		memcpy_fromio((skb)->data,(src),(len))
+
+#if 0
+
+/*
+ * XXX this is the kind of legacy stuff we want to get rid of with IA-64... --davidm 99/12/02
+ */
+
+/*
+ * This is used for checking BIOS signatures.  It's not clear at all
+ * why this is here.  This implementation seems to be the same on
+ * all architectures.  Strange.
+ */
+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;
+}
+
+#define RTC_PORT(x)		(0x70 + (x))
+#define RTC_ALWAYS_BCD		0
+
+#endif
+
+/*
+ * The caches on some architectures aren't DMA-coherent and have need
+ * to handle this in software.  There are two types of operations that
+ * can be applied to dma buffers.
+ *
+ * - 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) makes caches and memory coherent
+ *   by writing the content of the caches back to memory, if necessary
+ *   (cache flush).
+ *
+ * - dma_cache_wback_inv(start, size) Like dma_cache_wback() but the
+ *   function also invalidates the affected part of the caches as
+ *   necessary before DMA transfers from outside to memory.
+ *
+ * Fortunately, the IA-64 architecture mandates cache-coherent DMA, so
+ * these functions can be implemented as no-ops.
+ */
+#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_IA64_IO_H */