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4d7d6936eb
map_physmem() returns a virtual address which can be used to access a given physical address without involving the cache. unmap_physmem() should be called when the virtual address returned by map_physmem() is no longer needed. This patch adds a stub implementation which simply returns the physical address cast to a uchar * for all architectures except AVR32, which converts the physical address to an uncached virtual mapping. unmap_physmem() is a no-op on all architectures, but if any architecture needs to do such mappings through the TLB, this is the hook where those TLB entries can be invalidated. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
263 lines
6.9 KiB
C
263 lines
6.9 KiB
C
/*
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* IO header file
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*
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* Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
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* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef __ASM_M68K_IO_H__
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#define __ASM_M68K_IO_H__
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#include <asm/byteorder.h>
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/* ++roman: The assignments to temp. vars avoid that gcc sometimes generates
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* two accesses to memory, which may be undesirable for some devices.
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*/
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#define __raw_readb(addr) \
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({ u8 __v = (*(volatile u8 *) (addr)); __v; })
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#define __raw_readw(addr) \
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({ u16 __v = (*(volatile u16 *) (addr)); __v; })
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#define __raw_readl(addr) \
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({ u32 __v = (*(volatile u32 *) (addr)); __v; })
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#define __raw_writeb(addr,b) (void)((*(volatile u8 *) (addr)) = (b))
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#define __raw_writew(addr,w) (void)((*(volatile u16 *) (addr)) = (w))
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#define __raw_writel(addr,l) (void)((*(volatile u32 *) (addr)) = (l))
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#define readb(addr) in_8((volatile u8 *)(addr))
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#define writeb(b,addr) out_8((volatile u8 *)(addr), (b))
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#if !defined(__BIG_ENDIAN)
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#define readw(addr) (*(volatile u16 *) (addr))
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#define readl(addr) (*(volatile u32 *) (addr))
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#define writew(b,addr) ((*(volatile u16 *) (addr)) = (b))
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#define writel(b,addr) ((*(volatile u32 *) (addr)) = (b))
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#else
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#define readw(addr) in_le16((volatile u16 *)(addr))
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#define readl(addr) in_le32((volatile u32 *)(addr))
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#define writew(b,addr) out_le16((volatile u16 *)(addr),(b))
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#define writel(b,addr) out_le32((volatile u32 *)(addr),(b))
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#endif
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/*
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* The insw/outsw/insl/outsl macros don't do byte-swapping.
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* They are only used in practice for transferring buffers which
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* are arrays of bytes, and byte-swapping is not appropriate in
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* that case. - paulus
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*/
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#define insb(port, buf, ns) _insb((u8 *)((port)+_IO_BASE), (buf), (ns))
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#define outsb(port, buf, ns) _outsb((u8 *)((port)+_IO_BASE), (buf), (ns))
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#define insw(port, buf, ns) _insw_ns((u16 *)((port)+_IO_BASE), (buf), (ns))
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#define outsw(port, buf, ns) _outsw_ns((u16 *)((port)+_IO_BASE), (buf), (ns))
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#define insl(port, buf, nl) _insl_ns((u32 *)((port)+_IO_BASE), (buf), (nl))
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#define outsl(port, buf, nl) _outsl_ns((u32 *)((port)+_IO_BASE), (buf), (nl))
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#define inb(port) in_8((u8 *)((port)+_IO_BASE))
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#define outb(val, port) out_8((u8 *)((port)+_IO_BASE), (val))
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#if !defined(__BIG_ENDIAN)
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#define inw(port) in_be16((u16 *)((port)+_IO_BASE))
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#define outw(val, port) out_be16((u16 *)((port)+_IO_BASE), (val))
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#define inl(port) in_be32((u32 *)((port)+_IO_BASE))
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#define outl(val, port) out_be32((u32 *)((port)+_IO_BASE), (val))
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#else
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#define inw(port) in_le16((u16 *)((port)+_IO_BASE))
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#define outw(val, port) out_le16((u16 *)((port)+_IO_BASE), (val))
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#define inl(port) in_le32((u32 *)((port)+_IO_BASE))
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#define outl(val, port) out_le32((u32 *)((port)+_IO_BASE), (val))
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#endif
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extern inline void _insb(volatile u8 * port, void *buf, int ns)
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{
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u8 *data = (u8 *) buf;
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while (ns--)
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*data++ = *port;
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}
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extern inline void _outsb(volatile u8 * port, const void *buf, int ns)
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{
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u8 *data = (u8 *) buf;
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while (ns--)
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*port = *data++;
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}
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extern inline void _insw(volatile u16 * port, void *buf, int ns)
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{
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u16 *data = (u16 *) buf;
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while (ns--)
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*data++ = __sw16(*port);
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}
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extern inline void _outsw(volatile u16 * port, const void *buf, int ns)
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{
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u16 *data = (u16 *) buf;
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while (ns--) {
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*port = __sw16(*data);
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data++;
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}
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}
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extern inline void _insl(volatile u32 * port, void *buf, int nl)
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{
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u32 *data = (u32 *) buf;
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while (nl--)
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*data++ = __sw32(*port);
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}
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extern inline void _outsl(volatile u32 * port, const void *buf, int nl)
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{
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u32 *data = (u32 *) buf;
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while (nl--) {
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*port = __sw32(*data);
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data++;
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}
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}
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extern inline void _insw_ns(volatile u16 * port, void *buf, int ns)
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{
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u16 *data = (u16 *) buf;
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while (ns--)
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*data++ = *port;
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}
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extern inline void _outsw_ns(volatile u16 * port, const void *buf, int ns)
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{
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u16 *data = (u16 *) buf;
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while (ns--) {
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*port = *data++;
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}
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}
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extern inline void _insl_ns(volatile u32 * port, void *buf, int nl)
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{
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u32 *data = (u32 *) buf;
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while (nl--)
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*data++ = *port;
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}
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extern inline void _outsl_ns(volatile u32 * port, const void *buf, int nl)
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{
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u32 *data = (u32 *) buf;
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while (nl--) {
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*port = *data;
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data++;
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}
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}
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/*
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* The *_ns versions below don't do byte-swapping.
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* Neither do the standard versions now, these are just here
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* for older code.
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*/
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#define insw_ns(port, buf, ns) _insw_ns((u16 *)((port)+_IO_BASE), (buf), (ns))
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#define outsw_ns(port, buf, ns) _outsw_ns((u16 *)((port)+_IO_BASE), (buf), (ns))
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#define insl_ns(port, buf, nl) _insl_ns((u32 *)((port)+_IO_BASE), (buf), (nl))
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#define outsl_ns(port, buf, nl) _outsl_ns((u32 *)((port)+_IO_BASE), (buf), (nl))
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#define IO_SPACE_LIMIT ~0
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/*
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* 8, 16 and 32 bit, big and little endian I/O operations, with barrier.
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*/
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extern inline int in_8(volatile u8 * addr)
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{
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return (int)*addr;
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}
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extern inline void out_8(volatile u8 * addr, int val)
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{
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*addr = (u8) val;
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}
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extern inline int in_le16(volatile u16 * addr)
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{
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return __sw16(*addr);
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}
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extern inline int in_be16(volatile u16 * addr)
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{
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return (*addr & 0xFFFF);
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}
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extern inline void out_le16(volatile u16 * addr, int val)
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{
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*addr = __sw16(val);
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}
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extern inline void out_be16(volatile u16 * addr, int val)
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{
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*addr = (u16) val;
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}
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extern inline unsigned in_le32(volatile u32 * addr)
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{
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return __sw32(*addr);
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}
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extern inline unsigned in_be32(volatile u32 * addr)
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{
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return (*addr);
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}
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extern inline void out_le32(volatile unsigned *addr, int val)
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{
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*addr = __sw32(val);
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}
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extern inline void out_be32(volatile unsigned *addr, int val)
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{
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*addr = val;
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}
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static inline void sync(void)
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{
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/* This sync function is for PowerPC or other architecture instruction
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* ColdFire does not have this instruction. Dummy function, added for
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* compatibility (CFI driver)
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*/
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}
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/*
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* Given a physical address and a length, return a virtual address
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* that can be used to access the memory range with the caching
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* properties specified by "flags".
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*/
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typedef unsigned long phys_addr_t;
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#define MAP_NOCACHE (0)
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#define MAP_WRCOMBINE (0)
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#define MAP_WRBACK (0)
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#define MAP_WRTHROUGH (0)
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static inline void *
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map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
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{
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return (void *)paddr;
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}
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/*
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* Take down a mapping set up by map_physmem().
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*/
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static inline void unmap_physmem(void *vaddr, unsigned long flags)
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{
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}
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#endif /* __ASM_M68K_IO_H__ */
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