/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _M68KNOMMU_IO_H
#define _M68KNOMMU_IO_H
/*
* Convert a physical memory address into a IO memory address .
* For us this is trivially a type cast .
*/
#define iomem(a) ((void __iomem *) (a))
/*
* The non - MMU m68k and ColdFire IO and memory mapped hardware access
* functions have always worked in CPU native endian . We need to define
* that behavior here first before we include asm - generic / io . h .
*/
#define __raw_readb(addr) \
({ u8 __v = (*(__force volatile u8 *) (addr)); __v; })
#define __raw_readw(addr) \
({ u16 __v = (*(__force volatile u16 *) (addr)); __v; })
#define __raw_readl(addr) \
({ u32 __v = (*(__force volatile u32 *) (addr)); __v; })
#define __raw_writeb(b, addr) (void )((*(__force volatile u8 *) (addr)) = (b))
#define __raw_writew(b, addr) (void )((*(__force volatile u16 *) (addr)) = (b))
#define __raw_writel(b, addr) (void )((*(__force volatile u32 *) (addr)) = (b))
#if defined (CONFIG_COLDFIRE)
/*
* For ColdFire platforms we may need to do some extra checks for what
* type of address range we are accessing . Include the ColdFire platform
* definitions so we can figure out if need to do something special .
*/
#include <asm /byteorder.h>
#include <asm /coldfire.h>
#include <asm /mcfsim.h>
#endif /* CONFIG_COLDFIRE */
#if defined (IOMEMBASE)
/*
* The ColdFire SoC internal peripherals are mapped into virtual address
* space using the ACR registers of the cache control unit . This means we
* are using a 1 : 1 physical : virtual mapping for them . We can quickly
* determine if we are accessing an internal peripheral device given the
* physical or vitrual address using the same range check . This check logic
* applies just the same of there is no MMU but something like a PCI bus
* is present .
*/
static int __cf_internalio(unsigned long addr)
{
return (addr >= IOMEMBASE) && (addr <= IOMEMBASE + IOMEMSIZE - 1 );
}
static int cf_internalio(const volatile void __iomem *addr)
{
return __cf_internalio((unsigned long ) addr);
}
/*
* We need to treat built - in peripherals and bus based address ranges
* differently . Local built - in peripherals ( and the ColdFire SoC parts
* have quite a lot of them ) are always native endian - which is big
* endian on m68k / ColdFire . Bus based address ranges , like the PCI bus ,
* are accessed little endian - so we need to byte swap those .
*/
#define readw readw
static inline u16 readw(const volatile void __iomem *addr)
{
if (cf_internalio(addr))
return __raw_readw(addr);
return swab16(__raw_readw(addr));
}
#define readl readl
static inline u32 readl(const volatile void __iomem *addr)
{
if (cf_internalio(addr))
return __raw_readl(addr);
return swab32(__raw_readl(addr));
}
#define writew writew
static inline void writew(u16 value, volatile void __iomem *addr)
{
if (cf_internalio(addr))
__raw_writew(value, addr);
else
__raw_writew(swab16(value), addr);
}
#define writel writel
static inline void writel(u32 value, volatile void __iomem *addr)
{
if (cf_internalio(addr))
__raw_writel(value, addr);
else
__raw_writel(swab32(value), addr);
}
#else
#define readb __raw_readb
#define readw __raw_readw
#define readl __raw_readl
#define writeb __raw_writeb
#define writew __raw_writew
#define writel __raw_writel
#endif /* IOMEMBASE */
#if defined (CONFIG_PCI)
/*
* Support for PCI bus access uses the asm - generic access functions .
* We need to supply the base address and masks for the normal memory
* and IO address space mappings .
*/
#define PCI_MEM_PA 0 xf0000000 /* Host physical address */
#define PCI_MEM_BA 0 xf0000000 /* Bus physical address */
#define PCI_MEM_SIZE 0 x08000000 /* 128 MB */
#define PCI_MEM_MASK (PCI_MEM_SIZE - 1 )
#define PCI_IO_PA 0 xf8000000 /* Host physical address */
#define PCI_IO_BA 0 x00000000 /* Bus physical address */
#define PCI_IO_SIZE 0 x00010000 /* 64k */
#define PCI_IO_MASK (PCI_IO_SIZE - 1 )
#define PCI_IOBASE ((void __iomem *) PCI_IO_PA)
#define PCI_SPACE_LIMIT PCI_IO_MASK
#endif /* CONFIG_PCI */
#include <asm /kmap.h>
#include <asm /virtconvert.h>
#endif /* _M68KNOMMU_IO_H */
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