linux/arch/frv/include/asm/io.h
Stephen Boyd ef5c16b85b arch/frv/include/asm/io.h: accept const void pointers for read{b,w,l}()
The SMD driver is reading and writing chunks of data to iomem, and
there's an __iowrite32_copy() function for the writing part, but no
__ioread32_copy() function for the reading part.  This series adds
__ioread32_copy() and uses it in two places.

This patch (of 4):

The frv port uses compiler builtins, __builtin_read*(), for the I/O read
routines.  Unfortunately, these don't accept const void pointers although
the generic ASM implementations do, so generic code passing const pointers
to these APIs cause compilers to emit warnings.  Add wrapper functions
that cast away the const to avoid the warnings.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: David Howells <dhowells@redhat.com>
Cc: <zajec5@gmail.com>
Cc: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Cc: Hauke Mehrtens <hauke@hauke-m.de>
Cc: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-01-20 17:09:18 -08:00

415 lines
9.7 KiB
C

/* io.h: FRV I/O operations
*
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* This gets interesting when talking to the PCI bus - the CPU is in big endian
* mode, the PCI bus is little endian and the hardware in the middle can do
* byte swapping
*/
#ifndef _ASM_IO_H
#define _ASM_IO_H
#ifdef __KERNEL__
#define ARCH_HAS_IOREMAP_WT
#include <linux/types.h>
#include <asm/virtconvert.h>
#include <asm/string.h>
#include <asm/mb-regs.h>
#include <asm-generic/pci_iomap.h>
#include <linux/delay.h>
/*
* swap functions are sometimes needed to interface little-endian hardware
*/
static inline unsigned short _swapw(unsigned short v)
{
return ((v << 8) | (v >> 8));
}
static inline unsigned long _swapl(unsigned long v)
{
return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
}
//#define __iormb() asm volatile("membar")
//#define __iowmb() asm volatile("membar")
static inline u8 __raw_readb(const volatile void __iomem *addr)
{
return __builtin_read8((volatile void __iomem *)addr);
}
static inline u16 __raw_readw(const volatile void __iomem *addr)
{
return __builtin_read16((volatile void __iomem *)addr);
}
static inline u32 __raw_readl(const volatile void __iomem *addr)
{
return __builtin_read32((volatile void __iomem *)addr);
}
#define __raw_writeb(datum, addr) __builtin_write8(addr, datum)
#define __raw_writew(datum, addr) __builtin_write16(addr, datum)
#define __raw_writel(datum, addr) __builtin_write32(addr, datum)
static inline void io_outsb(unsigned int addr, const void *buf, int len)
{
unsigned long __ioaddr = (unsigned long) addr;
const uint8_t *bp = buf;
while (len--)
__builtin_write8((volatile void __iomem *) __ioaddr, *bp++);
}
static inline void io_outsw(unsigned int addr, const void *buf, int len)
{
unsigned long __ioaddr = (unsigned long) addr;
const uint16_t *bp = buf;
while (len--)
__builtin_write16((volatile void __iomem *) __ioaddr, (*bp++));
}
extern void __outsl_ns(unsigned int addr, const void *buf, int len);
extern void __outsl_sw(unsigned int addr, const void *buf, int len);
static inline void __outsl(unsigned int addr, const void *buf, int len, int swap)
{
unsigned long __ioaddr = (unsigned long) addr;
if (!swap)
__outsl_ns(__ioaddr, buf, len);
else
__outsl_sw(__ioaddr, buf, len);
}
static inline void io_insb(unsigned long addr, void *buf, int len)
{
uint8_t *bp = buf;
while (len--)
*bp++ = __builtin_read8((volatile void __iomem *) addr);
}
static inline void io_insw(unsigned long addr, void *buf, int len)
{
uint16_t *bp = buf;
while (len--)
*bp++ = __builtin_read16((volatile void __iomem *) addr);
}
extern void __insl_ns(unsigned long addr, void *buf, int len);
extern void __insl_sw(unsigned long addr, void *buf, int len);
static inline void __insl(unsigned long addr, void *buf, int len, int swap)
{
if (!swap)
__insl_ns(addr, buf, len);
else
__insl_sw(addr, buf, len);
}
#define mmiowb() mb()
/*
* make the short names macros so specific devices
* can override them as required
*/
static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
{
memset((void __force *) addr, val, count);
}
static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
{
memcpy(dst, (void __force *) src, count);
}
static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
{
memcpy((void __force *) dst, src, count);
}
static inline uint8_t inb(unsigned long addr)
{
return __builtin_read8((void __iomem *)addr);
}
static inline uint16_t inw(unsigned long addr)
{
uint16_t ret = __builtin_read16((void __iomem *)addr);
if (__is_PCI_IO(addr))
ret = _swapw(ret);
return ret;
}
static inline uint32_t inl(unsigned long addr)
{
uint32_t ret = __builtin_read32((void __iomem *)addr);
if (__is_PCI_IO(addr))
ret = _swapl(ret);
return ret;
}
static inline void outb(uint8_t datum, unsigned long addr)
{
__builtin_write8((void __iomem *)addr, datum);
}
static inline void outw(uint16_t datum, unsigned long addr)
{
if (__is_PCI_IO(addr))
datum = _swapw(datum);
__builtin_write16((void __iomem *)addr, datum);
}
static inline void outl(uint32_t datum, unsigned long addr)
{
if (__is_PCI_IO(addr))
datum = _swapl(datum);
__builtin_write32((void __iomem *)addr, datum);
}
#define inb_p(addr) inb(addr)
#define inw_p(addr) inw(addr)
#define inl_p(addr) inl(addr)
#define outb_p(x,addr) outb(x,addr)
#define outw_p(x,addr) outw(x,addr)
#define outl_p(x,addr) outl(x,addr)
#define outsb(a,b,l) io_outsb(a,b,l)
#define outsw(a,b,l) io_outsw(a,b,l)
#define outsl(a,b,l) __outsl(a,b,l,0)
#define insb(a,b,l) io_insb(a,b,l)
#define insw(a,b,l) io_insw(a,b,l)
#define insl(a,b,l) __insl(a,b,l,0)
#define IO_SPACE_LIMIT 0xffffffff
static inline uint8_t readb(const volatile void __iomem *addr)
{
return __builtin_read8((__force void volatile __iomem *) addr);
}
static inline uint16_t readw(const volatile void __iomem *addr)
{
uint16_t ret = __builtin_read16((__force void volatile __iomem *)addr);
if (__is_PCI_MEM(addr))
ret = _swapw(ret);
return ret;
}
static inline uint32_t readl(const volatile void __iomem *addr)
{
uint32_t ret = __builtin_read32((__force void volatile __iomem *)addr);
if (__is_PCI_MEM(addr))
ret = _swapl(ret);
return ret;
}
#define readb_relaxed readb
#define readw_relaxed readw
#define readl_relaxed readl
static inline void writeb(uint8_t datum, volatile void __iomem *addr)
{
__builtin_write8(addr, datum);
if (__is_PCI_MEM(addr))
__flush_PCI_writes();
}
static inline void writew(uint16_t datum, volatile void __iomem *addr)
{
if (__is_PCI_MEM(addr))
datum = _swapw(datum);
__builtin_write16(addr, datum);
if (__is_PCI_MEM(addr))
__flush_PCI_writes();
}
static inline void writel(uint32_t datum, volatile void __iomem *addr)
{
if (__is_PCI_MEM(addr))
datum = _swapl(datum);
__builtin_write32(addr, datum);
if (__is_PCI_MEM(addr))
__flush_PCI_writes();
}
#define writeb_relaxed writeb
#define writew_relaxed writew
#define writel_relaxed writel
/* Values for nocacheflag and cmode */
#define IOMAP_FULL_CACHING 0
#define IOMAP_NOCACHE_SER 1
#define IOMAP_NOCACHE_NONSER 2
#define IOMAP_WRITETHROUGH 3
extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
{
return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
}
static inline void __iomem *ioremap_nocache(unsigned long physaddr, unsigned long size)
{
return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
}
static inline void __iomem *ioremap_wt(unsigned long physaddr, unsigned long size)
{
return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
}
static inline void __iomem *ioremap_fullcache(unsigned long physaddr, unsigned long size)
{
return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
}
#define ioremap_wc ioremap_nocache
#define ioremap_uc ioremap_nocache
extern void iounmap(void volatile __iomem *addr);
static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
{
return (void __iomem *) port;
}
static inline void ioport_unmap(void __iomem *p)
{
}
static inline void flush_write_buffers(void)
{
__asm__ __volatile__ ("membar" : : :"memory");
}
/*
* do appropriate I/O accesses for token type
*/
static inline unsigned int ioread8(void __iomem *p)
{
return __builtin_read8(p);
}
static inline unsigned int ioread16(void __iomem *p)
{
uint16_t ret = __builtin_read16(p);
if (__is_PCI_addr(p))
ret = _swapw(ret);
return ret;
}
static inline unsigned int ioread32(void __iomem *p)
{
uint32_t ret = __builtin_read32(p);
if (__is_PCI_addr(p))
ret = _swapl(ret);
return ret;
}
static inline void iowrite8(u8 val, void __iomem *p)
{
__builtin_write8(p, val);
if (__is_PCI_MEM(p))
__flush_PCI_writes();
}
static inline void iowrite16(u16 val, void __iomem *p)
{
if (__is_PCI_addr(p))
val = _swapw(val);
__builtin_write16(p, val);
if (__is_PCI_MEM(p))
__flush_PCI_writes();
}
static inline void iowrite32(u32 val, void __iomem *p)
{
if (__is_PCI_addr(p))
val = _swapl(val);
__builtin_write32(p, val);
if (__is_PCI_MEM(p))
__flush_PCI_writes();
}
#define ioread16be(addr) be16_to_cpu(ioread16(addr))
#define ioread32be(addr) be32_to_cpu(ioread32(addr))
#define iowrite16be(v, addr) iowrite16(cpu_to_be16(v), (addr))
#define iowrite32be(v, addr) iowrite32(cpu_to_be32(v), (addr))
static inline void ioread8_rep(void __iomem *p, void *dst, unsigned long count)
{
io_insb((unsigned long) p, dst, count);
}
static inline void ioread16_rep(void __iomem *p, void *dst, unsigned long count)
{
io_insw((unsigned long) p, dst, count);
}
static inline void ioread32_rep(void __iomem *p, void *dst, unsigned long count)
{
__insl_ns((unsigned long) p, dst, count);
}
static inline void iowrite8_rep(void __iomem *p, const void *src, unsigned long count)
{
io_outsb((unsigned long) p, src, count);
}
static inline void iowrite16_rep(void __iomem *p, const void *src, unsigned long count)
{
io_outsw((unsigned long) p, src, count);
}
static inline void iowrite32_rep(void __iomem *p, const void *src, unsigned long count)
{
__outsl_ns((unsigned long) p, src, count);
}
/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
struct pci_dev;
static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
{
}
/*
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
* access
*/
#define xlate_dev_mem_ptr(p) __va(p)
/*
* Convert a virtual cached pointer to an uncached pointer
*/
#define xlate_dev_kmem_ptr(p) p
#endif /* __KERNEL__ */
#endif /* _ASM_IO_H */