138 lines
4.1 KiB
C
138 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _M68KNOMMU_IO_H
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#define _M68KNOMMU_IO_H
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/*
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* Convert a physical memory address into a IO memory address.
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* For us this is trivially a type cast.
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*/
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#define iomem(a) ((void __iomem *) (a))
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/*
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* The non-MMU m68k and ColdFire IO and memory mapped hardware access
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* functions have always worked in CPU native endian. We need to define
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* that behavior here first before we include asm-generic/io.h.
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*/
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#define __raw_readb(addr) \
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({ u8 __v = (*(__force volatile u8 *) (addr)); __v; })
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#define __raw_readw(addr) \
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({ u16 __v = (*(__force volatile u16 *) (addr)); __v; })
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#define __raw_readl(addr) \
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({ u32 __v = (*(__force volatile u32 *) (addr)); __v; })
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#define __raw_writeb(b, addr) (void)((*(__force volatile u8 *) (addr)) = (b))
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#define __raw_writew(b, addr) (void)((*(__force volatile u16 *) (addr)) = (b))
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#define __raw_writel(b, addr) (void)((*(__force volatile u32 *) (addr)) = (b))
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#if defined(CONFIG_COLDFIRE)
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/*
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* For ColdFire platforms we may need to do some extra checks for what
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* type of address range we are accessing. Include the ColdFire platform
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* definitions so we can figure out if need to do something special.
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*/
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#include <asm/byteorder.h>
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#include <asm/coldfire.h>
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#include <asm/mcfsim.h>
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#endif /* CONFIG_COLDFIRE */
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#if defined(IOMEMBASE)
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/*
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* The ColdFire SoC internal peripherals are mapped into virtual address
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* space using the ACR registers of the cache control unit. This means we
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* are using a 1:1 physical:virtual mapping for them. We can quickly
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* determine if we are accessing an internal peripheral device given the
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* physical or vitrual address using the same range check. This check logic
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* applies just the same of there is no MMU but something like a PCI bus
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* is present.
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*/
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static int __cf_internalio(unsigned long addr)
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{
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return (addr >= IOMEMBASE) && (addr <= IOMEMBASE + IOMEMSIZE - 1);
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}
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static int cf_internalio(const volatile void __iomem *addr)
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{
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return __cf_internalio((unsigned long) addr);
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}
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/*
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* We need to treat built-in peripherals and bus based address ranges
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* differently. Local built-in peripherals (and the ColdFire SoC parts
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* have quite a lot of them) are always native endian - which is big
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* endian on m68k/ColdFire. Bus based address ranges, like the PCI bus,
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* are accessed little endian - so we need to byte swap those.
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*/
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#define readw readw
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static inline u16 readw(const volatile void __iomem *addr)
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{
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if (cf_internalio(addr))
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return __raw_readw(addr);
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return swab16(__raw_readw(addr));
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}
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#define readl readl
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static inline u32 readl(const volatile void __iomem *addr)
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{
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if (cf_internalio(addr))
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return __raw_readl(addr);
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return swab32(__raw_readl(addr));
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}
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#define writew writew
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static inline void writew(u16 value, volatile void __iomem *addr)
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{
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if (cf_internalio(addr))
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__raw_writew(value, addr);
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else
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__raw_writew(swab16(value), addr);
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}
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#define writel writel
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static inline void writel(u32 value, volatile void __iomem *addr)
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{
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if (cf_internalio(addr))
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__raw_writel(value, addr);
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else
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__raw_writel(swab32(value), addr);
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}
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#else
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#define readb __raw_readb
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#define readw __raw_readw
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#define readl __raw_readl
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#define writeb __raw_writeb
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#define writew __raw_writew
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#define writel __raw_writel
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#endif /* IOMEMBASE */
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#if defined(CONFIG_PCI)
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/*
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* Support for PCI bus access uses the asm-generic access functions.
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* We need to supply the base address and masks for the normal memory
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* and IO address space mappings.
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*/
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#define PCI_MEM_PA 0xf0000000 /* Host physical address */
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#define PCI_MEM_BA 0xf0000000 /* Bus physical address */
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#define PCI_MEM_SIZE 0x08000000 /* 128 MB */
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#define PCI_MEM_MASK (PCI_MEM_SIZE - 1)
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#define PCI_IO_PA 0xf8000000 /* Host physical address */
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#define PCI_IO_BA 0x00000000 /* Bus physical address */
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#define PCI_IO_SIZE 0x00010000 /* 64k */
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#define PCI_IO_MASK (PCI_IO_SIZE - 1)
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#define HAVE_ARCH_PIO_SIZE
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#define PIO_OFFSET 0
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#define PIO_MASK 0xffff
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#define PIO_RESERVED 0x10000
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#define PCI_IOBASE ((void __iomem *) PCI_IO_PA)
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#define PCI_SPACE_LIMIT PCI_IO_MASK
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#endif /* CONFIG_PCI */
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#include <asm/kmap.h>
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#include <asm/virtconvert.h>
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#endif /* _M68KNOMMU_IO_H */
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