561 lines
17 KiB
C
561 lines
17 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994, 1995 Waldorf GmbH
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* Copyright (C) 1994 - 2000, 06 Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
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* Author: Maciej W. Rozycki <macro@mips.com>
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*/
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#ifndef _ASM_IO_H
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#define _ASM_IO_H
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#define ARCH_HAS_IOREMAP_WC
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#include <linux/compiler.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/irqflags.h>
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#include <asm/addrspace.h>
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#include <asm/barrier.h>
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#include <asm/bug.h>
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#include <asm/byteorder.h>
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#include <asm/cpu.h>
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#include <asm/cpu-features.h>
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#include <asm-generic/iomap.h>
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#include <asm/page.h>
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#include <asm/pgtable-bits.h>
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#include <asm/processor.h>
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#include <asm/string.h>
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#include <mangle-port.h>
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/*
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* Raw operations are never swapped in software. OTOH values that raw
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* operations are working on may or may not have been swapped by the bus
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* hardware. An example use would be for flash memory that's used for
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* execute in place.
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*/
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# define __raw_ioswabb(a, x) (x)
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# define __raw_ioswabw(a, x) (x)
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# define __raw_ioswabl(a, x) (x)
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# define __raw_ioswabq(a, x) (x)
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# define ____raw_ioswabq(a, x) (x)
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# define __relaxed_ioswabb ioswabb
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# define __relaxed_ioswabw ioswabw
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# define __relaxed_ioswabl ioswabl
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# define __relaxed_ioswabq ioswabq
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/* ioswab[bwlq], __mem_ioswab[bwlq] are defined in mangle-port.h */
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/*
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* On MIPS I/O ports are memory mapped, so we access them using normal
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* load/store instructions. mips_io_port_base is the virtual address to
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* which all ports are being mapped. For sake of efficiency some code
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* assumes that this is an address that can be loaded with a single lui
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* instruction, so the lower 16 bits must be zero. Should be true on
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* any sane architecture; generic code does not use this assumption.
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*/
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extern unsigned long mips_io_port_base;
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static inline void set_io_port_base(unsigned long base)
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{
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mips_io_port_base = base;
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}
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/*
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* Provide the necessary definitions for generic iomap. We make use of
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* mips_io_port_base for iomap(), but we don't reserve any low addresses for
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* use with I/O ports.
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*/
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#define HAVE_ARCH_PIO_SIZE
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#define PIO_OFFSET mips_io_port_base
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#define PIO_MASK IO_SPACE_LIMIT
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#define PIO_RESERVED 0x0UL
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/*
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* Enforce in-order execution of data I/O. In the MIPS architecture
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* these are equivalent to corresponding platform-specific memory
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* barriers defined in <asm/barrier.h>. API pinched from PowerPC,
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* with sync additionally defined.
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*/
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#define iobarrier_rw() mb()
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#define iobarrier_r() rmb()
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#define iobarrier_w() wmb()
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#define iobarrier_sync() iob()
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/*
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* virt_to_phys - map virtual addresses to physical
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* @address: address to remap
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*
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* The returned physical address is the physical (CPU) mapping for
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* the memory address given. It is only valid to use this function on
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* addresses directly mapped or allocated via kmalloc.
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*
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* This function does not give bus mappings for DMA transfers. In
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* almost all conceivable cases a device driver should not be using
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* this function
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*/
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static inline unsigned long __virt_to_phys_nodebug(volatile const void *address)
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{
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return __pa(address);
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}
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#ifdef CONFIG_DEBUG_VIRTUAL
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extern phys_addr_t __virt_to_phys(volatile const void *x);
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#else
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#define __virt_to_phys(x) __virt_to_phys_nodebug(x)
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#endif
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#define virt_to_phys virt_to_phys
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static inline phys_addr_t virt_to_phys(const volatile void *x)
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{
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return __virt_to_phys(x);
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}
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/*
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* phys_to_virt - map physical address to virtual
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* @address: address to remap
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*
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* The returned virtual address is a current CPU mapping for
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* the memory address given. It is only valid to use this function on
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* addresses that have a kernel mapping
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*
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* This function does not handle bus mappings for DMA transfers. In
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* almost all conceivable cases a device driver should not be using
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* this function
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*/
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static inline void * phys_to_virt(unsigned long address)
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{
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return __va(address);
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}
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/*
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* ISA I/O bus memory addresses are 1:1 with the physical address.
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*/
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static inline unsigned long isa_virt_to_bus(volatile void *address)
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{
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return virt_to_phys(address);
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}
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static inline void *isa_bus_to_virt(unsigned long address)
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{
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return phys_to_virt(address);
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}
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/*
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* Change "struct page" to physical address.
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*/
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#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
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void __iomem *ioremap_prot(phys_addr_t offset, unsigned long size,
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unsigned long prot_val);
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void iounmap(const volatile void __iomem *addr);
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/*
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* ioremap - map bus memory into CPU space
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* @offset: bus address of the memory
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* @size: size of the resource to map
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*
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* ioremap performs a platform specific sequence of operations to
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* make bus memory CPU accessible via the readb/readw/readl/writeb/
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* writew/writel functions and the other mmio helpers. The returned
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* address is not guaranteed to be usable directly as a virtual
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* address.
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*/
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#define ioremap(offset, size) \
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ioremap_prot((offset), (size), _CACHE_UNCACHED)
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#define ioremap_uc ioremap
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/*
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* ioremap_cache - map bus memory into CPU space
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* @offset: bus address of the memory
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* @size: size of the resource to map
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*
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* ioremap_cache performs a platform specific sequence of operations to
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* make bus memory CPU accessible via the readb/readw/readl/writeb/
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* writew/writel functions and the other mmio helpers. The returned
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* address is not guaranteed to be usable directly as a virtual
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* address.
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*
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* This version of ioremap ensures that the memory is marked cachable by
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* the CPU. Also enables full write-combining. Useful for some
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* memory-like regions on I/O busses.
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*/
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#define ioremap_cache(offset, size) \
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ioremap_prot((offset), (size), _page_cachable_default)
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/*
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* ioremap_wc - map bus memory into CPU space
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* @offset: bus address of the memory
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* @size: size of the resource to map
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*
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* ioremap_wc performs a platform specific sequence of operations to
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* make bus memory CPU accessible via the readb/readw/readl/writeb/
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* writew/writel functions and the other mmio helpers. The returned
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* address is not guaranteed to be usable directly as a virtual
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* address.
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*
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* This version of ioremap ensures that the memory is marked uncachable
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* but accelerated by means of write-combining feature. It is specifically
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* useful for PCIe prefetchable windows, which may vastly improve a
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* communications performance. If it was determined on boot stage, what
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* CPU CCA doesn't support UCA, the method shall fall-back to the
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* _CACHE_UNCACHED option (see cpu_probe() method).
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*/
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#define ioremap_wc(offset, size) \
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ioremap_prot((offset), (size), boot_cpu_data.writecombine)
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#if defined(CONFIG_CPU_CAVIUM_OCTEON) || defined(CONFIG_CPU_LOONGSON64)
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#define war_io_reorder_wmb() wmb()
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#else
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#define war_io_reorder_wmb() barrier()
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#endif
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#define __BUILD_MEMORY_SINGLE(pfx, bwlq, type, barrier, relax, irq) \
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\
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static inline void pfx##write##bwlq(type val, \
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volatile void __iomem *mem) \
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{ \
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volatile type *__mem; \
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type __val; \
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\
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if (barrier) \
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iobarrier_rw(); \
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else \
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war_io_reorder_wmb(); \
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\
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__mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \
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\
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__val = pfx##ioswab##bwlq(__mem, val); \
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\
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if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \
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*__mem = __val; \
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else if (cpu_has_64bits) { \
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unsigned long __flags; \
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type __tmp; \
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\
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if (irq) \
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local_irq_save(__flags); \
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__asm__ __volatile__( \
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".set push" "\t\t# __writeq""\n\t" \
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".set arch=r4000" "\n\t" \
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"dsll32 %L0, %L0, 0" "\n\t" \
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"dsrl32 %L0, %L0, 0" "\n\t" \
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"dsll32 %M0, %M0, 0" "\n\t" \
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"or %L0, %L0, %M0" "\n\t" \
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"sd %L0, %2" "\n\t" \
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".set pop" "\n" \
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: "=r" (__tmp) \
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: "0" (__val), "m" (*__mem)); \
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if (irq) \
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local_irq_restore(__flags); \
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} else \
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BUG(); \
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} \
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\
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static inline type pfx##read##bwlq(const volatile void __iomem *mem) \
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{ \
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volatile type *__mem; \
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type __val; \
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\
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__mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \
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\
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if (barrier) \
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iobarrier_rw(); \
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\
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if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \
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__val = *__mem; \
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else if (cpu_has_64bits) { \
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unsigned long __flags; \
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\
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if (irq) \
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local_irq_save(__flags); \
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__asm__ __volatile__( \
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".set push" "\t\t# __readq" "\n\t" \
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".set arch=r4000" "\n\t" \
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"ld %L0, %1" "\n\t" \
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"dsra32 %M0, %L0, 0" "\n\t" \
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"sll %L0, %L0, 0" "\n\t" \
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".set pop" "\n" \
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: "=r" (__val) \
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: "m" (*__mem)); \
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if (irq) \
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local_irq_restore(__flags); \
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} else { \
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__val = 0; \
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BUG(); \
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} \
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\
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/* prevent prefetching of coherent DMA data prematurely */ \
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if (!relax) \
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rmb(); \
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return pfx##ioswab##bwlq(__mem, __val); \
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}
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#define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, barrier, relax, p) \
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\
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static inline void pfx##out##bwlq##p(type val, unsigned long port) \
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{ \
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volatile type *__addr; \
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type __val; \
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\
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if (barrier) \
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iobarrier_rw(); \
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else \
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war_io_reorder_wmb(); \
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\
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__addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
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\
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__val = pfx##ioswab##bwlq(__addr, val); \
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\
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/* Really, we want this to be atomic */ \
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BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \
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\
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*__addr = __val; \
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} \
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\
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static inline type pfx##in##bwlq##p(unsigned long port) \
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{ \
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volatile type *__addr; \
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type __val; \
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\
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__addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
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\
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BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \
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\
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if (barrier) \
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iobarrier_rw(); \
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\
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__val = *__addr; \
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\
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/* prevent prefetching of coherent DMA data prematurely */ \
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if (!relax) \
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rmb(); \
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return pfx##ioswab##bwlq(__addr, __val); \
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}
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#define __BUILD_MEMORY_PFX(bus, bwlq, type, relax) \
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\
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__BUILD_MEMORY_SINGLE(bus, bwlq, type, 1, relax, 1)
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#define BUILDIO_MEM(bwlq, type) \
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\
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__BUILD_MEMORY_PFX(__raw_, bwlq, type, 0) \
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__BUILD_MEMORY_PFX(__relaxed_, bwlq, type, 1) \
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__BUILD_MEMORY_PFX(__mem_, bwlq, type, 0) \
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__BUILD_MEMORY_PFX(, bwlq, type, 0)
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BUILDIO_MEM(b, u8)
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BUILDIO_MEM(w, u16)
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BUILDIO_MEM(l, u32)
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#ifdef CONFIG_64BIT
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BUILDIO_MEM(q, u64)
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#else
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__BUILD_MEMORY_PFX(__raw_, q, u64, 0)
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__BUILD_MEMORY_PFX(__mem_, q, u64, 0)
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#endif
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#define __BUILD_IOPORT_PFX(bus, bwlq, type) \
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__BUILD_IOPORT_SINGLE(bus, bwlq, type, 1, 0,) \
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__BUILD_IOPORT_SINGLE(bus, bwlq, type, 1, 0, _p)
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#define BUILDIO_IOPORT(bwlq, type) \
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__BUILD_IOPORT_PFX(, bwlq, type) \
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__BUILD_IOPORT_PFX(__mem_, bwlq, type)
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BUILDIO_IOPORT(b, u8)
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BUILDIO_IOPORT(w, u16)
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BUILDIO_IOPORT(l, u32)
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#ifdef CONFIG_64BIT
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BUILDIO_IOPORT(q, u64)
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#endif
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#define __BUILDIO(bwlq, type) \
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\
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__BUILD_MEMORY_SINGLE(____raw_, bwlq, type, 1, 0, 0)
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__BUILDIO(q, u64)
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#define readb_relaxed __relaxed_readb
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#define readw_relaxed __relaxed_readw
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#define readl_relaxed __relaxed_readl
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#ifdef CONFIG_64BIT
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#define readq_relaxed __relaxed_readq
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#endif
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#define writeb_relaxed __relaxed_writeb
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#define writew_relaxed __relaxed_writew
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#define writel_relaxed __relaxed_writel
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#ifdef CONFIG_64BIT
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#define writeq_relaxed __relaxed_writeq
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#endif
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#define readb_be(addr) \
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__raw_readb((__force unsigned *)(addr))
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#define readw_be(addr) \
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be16_to_cpu(__raw_readw((__force unsigned *)(addr)))
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#define readl_be(addr) \
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be32_to_cpu(__raw_readl((__force unsigned *)(addr)))
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#define readq_be(addr) \
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be64_to_cpu(__raw_readq((__force unsigned *)(addr)))
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#define writeb_be(val, addr) \
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__raw_writeb((val), (__force unsigned *)(addr))
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#define writew_be(val, addr) \
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__raw_writew(cpu_to_be16((val)), (__force unsigned *)(addr))
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#define writel_be(val, addr) \
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__raw_writel(cpu_to_be32((val)), (__force unsigned *)(addr))
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#define writeq_be(val, addr) \
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__raw_writeq(cpu_to_be64((val)), (__force unsigned *)(addr))
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/*
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* Some code tests for these symbols
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*/
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#ifdef CONFIG_64BIT
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#define readq readq
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#define writeq writeq
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#endif
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#define __BUILD_MEMORY_STRING(bwlq, type) \
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\
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static inline void writes##bwlq(volatile void __iomem *mem, \
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const void *addr, unsigned int count) \
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{ \
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const volatile type *__addr = addr; \
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\
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while (count--) { \
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__mem_write##bwlq(*__addr, mem); \
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__addr++; \
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} \
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} \
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\
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static inline void reads##bwlq(volatile void __iomem *mem, void *addr, \
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unsigned int count) \
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{ \
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volatile type *__addr = addr; \
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\
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while (count--) { \
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*__addr = __mem_read##bwlq(mem); \
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__addr++; \
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} \
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}
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#define __BUILD_IOPORT_STRING(bwlq, type) \
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\
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static inline void outs##bwlq(unsigned long port, const void *addr, \
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unsigned int count) \
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{ \
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const volatile type *__addr = addr; \
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\
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while (count--) { \
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__mem_out##bwlq(*__addr, port); \
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__addr++; \
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} \
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} \
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\
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static inline void ins##bwlq(unsigned long port, void *addr, \
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unsigned int count) \
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{ \
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volatile type *__addr = addr; \
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\
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while (count--) { \
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*__addr = __mem_in##bwlq(port); \
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__addr++; \
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} \
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}
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#define BUILDSTRING(bwlq, type) \
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\
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__BUILD_MEMORY_STRING(bwlq, type) \
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__BUILD_IOPORT_STRING(bwlq, type)
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BUILDSTRING(b, u8)
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BUILDSTRING(w, u16)
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BUILDSTRING(l, u32)
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#ifdef CONFIG_64BIT
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BUILDSTRING(q, u64)
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#endif
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static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
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{
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memset((void __force *) addr, val, count);
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}
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static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
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{
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memcpy(dst, (void __force *) src, count);
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}
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static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
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{
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memcpy((void __force *) dst, src, count);
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}
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/*
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* The caches on some architectures aren't dma-coherent and have need to
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* handle this in software. There are three types of operations that
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* can be applied to dma buffers.
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*
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* - dma_cache_wback_inv(start, size) makes caches and coherent by
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* writing the content of the caches back to memory, if necessary.
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* The function also invalidates the affected part of the caches as
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* necessary before DMA transfers from outside to memory.
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* - dma_cache_wback(start, size) makes caches and coherent by
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* writing the content of the caches back to memory, if necessary.
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* The function also invalidates the affected part of the caches as
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* necessary before DMA transfers from outside to memory.
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* - dma_cache_inv(start, size) invalidates the affected parts of the
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* caches. Dirty lines of the caches may be written back or simply
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* be discarded. This operation is necessary before dma operations
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* to the memory.
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*
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* This API used to be exported; it now is for arch code internal use only.
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*/
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#ifdef CONFIG_DMA_NONCOHERENT
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extern void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
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extern void (*_dma_cache_wback)(unsigned long start, unsigned long size);
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extern void (*_dma_cache_inv)(unsigned long start, unsigned long size);
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#define dma_cache_wback_inv(start, size) _dma_cache_wback_inv(start, size)
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#define dma_cache_wback(start, size) _dma_cache_wback(start, size)
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#define dma_cache_inv(start, size) _dma_cache_inv(start, size)
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#else /* Sane hardware */
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#define dma_cache_wback_inv(start,size) \
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do { (void) (start); (void) (size); } while (0)
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#define dma_cache_wback(start,size) \
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do { (void) (start); (void) (size); } while (0)
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#define dma_cache_inv(start,size) \
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do { (void) (start); (void) (size); } while (0)
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|
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#endif /* CONFIG_DMA_NONCOHERENT */
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|
|
/*
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|
* Read a 32-bit register that requires a 64-bit read cycle on the bus.
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|
* Avoid interrupt mucking, just adjust the address for 4-byte access.
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|
* Assume the addresses are 8-byte aligned.
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|
*/
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|
#ifdef __MIPSEB__
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|
#define __CSR_32_ADJUST 4
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|
#else
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|
#define __CSR_32_ADJUST 0
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|
#endif
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|
|
|
#define csr_out32(v, a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST) = (v))
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|
#define csr_in32(a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST))
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|
|
|
/*
|
|
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
|
|
* access
|
|
*/
|
|
#define xlate_dev_mem_ptr(p) __va(p)
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|
|
|
void __ioread64_copy(void *to, const void __iomem *from, size_t count);
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|
|
|
#endif /* _ASM_IO_H */
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