forked from Minki/linux
79bf0cbd86
In order to provide non-atomic functions for io{read|write}64 that will
use readq and writeq when appropriate. We define a number of variants
of these functions in the generic iomap that will do non-atomic
operations on pio but atomic operations on mmio.
These functions are only defined if readq and writeq are defined. If
they are not, then the wrappers that always use non-atomic operations
from include/linux/io-64-nonatomic*.h will be used.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Suresh Warrier <warrier@linux.vnet.ibm.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
117 lines
3.9 KiB
C
117 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __GENERIC_IO_H
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#define __GENERIC_IO_H
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#include <linux/linkage.h>
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#include <asm/byteorder.h>
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/*
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* These are the "generic" interfaces for doing new-style
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* memory-mapped or PIO accesses. Architectures may do
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* their own arch-optimized versions, these just act as
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* wrappers around the old-style IO register access functions:
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* read[bwl]/write[bwl]/in[bwl]/out[bwl]
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*
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* Don't include this directly, include it from <asm/io.h>.
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*/
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/*
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* Read/write from/to an (offsettable) iomem cookie. It might be a PIO
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* access or a MMIO access, these functions don't care. The info is
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* encoded in the hardware mapping set up by the mapping functions
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* (or the cookie itself, depending on implementation and hw).
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*
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* The generic routines just encode the PIO/MMIO as part of the
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* cookie, and coldly assume that the MMIO IO mappings are not
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* in the low address range. Architectures for which this is not
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* true can't use this generic implementation.
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*/
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extern unsigned int ioread8(void __iomem *);
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extern unsigned int ioread16(void __iomem *);
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extern unsigned int ioread16be(void __iomem *);
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extern unsigned int ioread32(void __iomem *);
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extern unsigned int ioread32be(void __iomem *);
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#ifdef CONFIG_64BIT
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extern u64 ioread64(void __iomem *);
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extern u64 ioread64be(void __iomem *);
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#endif
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#ifdef readq
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#define ioread64_lo_hi ioread64_lo_hi
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#define ioread64_hi_lo ioread64_hi_lo
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#define ioread64be_lo_hi ioread64be_lo_hi
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#define ioread64be_hi_lo ioread64be_hi_lo
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extern u64 ioread64_lo_hi(void __iomem *addr);
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extern u64 ioread64_hi_lo(void __iomem *addr);
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extern u64 ioread64be_lo_hi(void __iomem *addr);
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extern u64 ioread64be_hi_lo(void __iomem *addr);
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#endif
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extern void iowrite8(u8, void __iomem *);
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extern void iowrite16(u16, void __iomem *);
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extern void iowrite16be(u16, void __iomem *);
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extern void iowrite32(u32, void __iomem *);
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extern void iowrite32be(u32, void __iomem *);
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#ifdef CONFIG_64BIT
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extern void iowrite64(u64, void __iomem *);
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extern void iowrite64be(u64, void __iomem *);
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#endif
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#ifdef writeq
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#define iowrite64_lo_hi iowrite64_lo_hi
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#define iowrite64_hi_lo iowrite64_hi_lo
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#define iowrite64be_lo_hi iowrite64be_lo_hi
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#define iowrite64be_hi_lo iowrite64be_hi_lo
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extern void iowrite64_lo_hi(u64 val, void __iomem *addr);
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extern void iowrite64_hi_lo(u64 val, void __iomem *addr);
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extern void iowrite64be_lo_hi(u64 val, void __iomem *addr);
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extern void iowrite64be_hi_lo(u64 val, void __iomem *addr);
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#endif
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/*
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* "string" versions of the above. Note that they
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* use native byte ordering for the accesses (on
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* the assumption that IO and memory agree on a
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* byte order, and CPU byteorder is irrelevant).
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*
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* They do _not_ update the port address. If you
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* want MMIO that copies stuff laid out in MMIO
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* memory across multiple ports, use "memcpy_toio()"
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* and friends.
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*/
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extern void ioread8_rep(void __iomem *port, void *buf, unsigned long count);
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extern void ioread16_rep(void __iomem *port, void *buf, unsigned long count);
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extern void ioread32_rep(void __iomem *port, void *buf, unsigned long count);
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extern void iowrite8_rep(void __iomem *port, const void *buf, unsigned long count);
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extern void iowrite16_rep(void __iomem *port, const void *buf, unsigned long count);
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extern void iowrite32_rep(void __iomem *port, const void *buf, unsigned long count);
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#ifdef CONFIG_HAS_IOPORT_MAP
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/* Create a virtual mapping cookie for an IO port range */
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extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
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extern void ioport_unmap(void __iomem *);
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#endif
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#ifndef ARCH_HAS_IOREMAP_WC
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#define ioremap_wc ioremap_nocache
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#endif
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#ifndef ARCH_HAS_IOREMAP_WT
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#define ioremap_wt ioremap_nocache
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#endif
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#ifdef CONFIG_PCI
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/* Destroy a virtual mapping cookie for a PCI BAR (memory or IO) */
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struct pci_dev;
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extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
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#elif defined(CONFIG_GENERIC_IOMAP)
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struct pci_dev;
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static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
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{ }
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#endif
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#include <asm-generic/pci_iomap.h>
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#endif
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