/* SPDX-License-Identifier: GPL-2.0-only */
/*
* IO definitions for the Hexagon architecture
*
* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
*/
#ifndef _ASM_IO_H
#define _ASM_IO_H
#ifdef __KERNEL__
#include <linux/types.h>
#include <asm/iomap.h>
#include <asm/page.h>
#include <asm/cacheflush.h>
/*
* We don't have PCI yet.
* _IO_BASE is pointing at what should be unused virtual space.
*/
#define IO_SPACE_LIMIT 0xffff
#define _IO_BASE ((void __iomem *)0xfe000000)
#define IOMEM(x) ((void __force __iomem *)(x))
extern int remap_area_pages(unsigned long start, unsigned long phys_addr,
unsigned long end, unsigned long flags);
/* Defined in lib/io.c, needed for smc91x driver. */
extern void __raw_readsw(const void __iomem *addr, void *data, int wordlen);
extern void __raw_writesw(void __iomem *addr, const void *data, int wordlen);
extern void __raw_readsl(const void __iomem *addr, void *data, int wordlen);
extern void __raw_writesl(void __iomem *addr, const void *data, int wordlen);
#define readsw(p, d, l) __raw_readsw(p, d, l)
#define writesw(p, d, l) __raw_writesw(p, d, l)
#define readsl(p, d, l) __raw_readsl(p, d, l)
#define writesl(p, d, l) __raw_writesl(p, d, l)
/*
* virt_to_phys - map virtual address to physical
* @address: address to map
*/
static inline unsigned long virt_to_phys(volatile void *address)
{
return __pa(address);
}
/*
* phys_to_virt - map physical address to virtual
* @address: address to map
*/
static inline void *phys_to_virt(unsigned long address)
{
return __va(address);
}
/*
* IO port access primitives. Hexagon doesn't have special IO access
* instructions; all I/O is memory mapped.
*
* in/out are used for "ports", but we don't have "port instructions",
* so these are really just memory mapped too.
*/
/*
* readb - read byte from memory mapped device
* @addr: pointer to memory
*
* Operates on "I/O bus memory space"
*/
static inline u8 readb(const volatile void __iomem *addr)
{
u8 val;
asm volatile(
"%0 = memb(%1);"
: "=&r" (val)
: "r" (addr)
);
return val;
}
static inline u16 readw(const volatile void __iomem *addr)
{
u16 val;
asm volatile(
"%0 = memh(%1);"
: "=&r" (val)
: "r" (addr)
);
return val;
}
static inline u32 readl(const volatile void __iomem *addr)
{
u32 val;
asm volatile(
"%0 = memw(%1);"
: "=&r" (val)
: "r" (addr)
);
return val;
}
/*
* writeb - write a byte to a memory location
* @data: data to write to
* @addr: pointer to memory
*
*/
static inline void writeb(u8 data, volatile void __iomem *addr)
{
asm volatile(
"memb(%0) = %1;"
:
: "r" (addr), "r" (data)
: "memory"
);
}
static inline void writew(u16 data, volatile void __iomem *addr)
{
asm volatile(
"memh(%0) = %1;"
:
: "r" (addr), "r" (data)
: "memory"
);
}
static inline void writel(u32 data, volatile void __iomem *addr)
{
asm volatile(
"memw(%0) = %1;"
:
: "r" (addr), "r" (data)
: "memory"
);
}
#define __raw_writeb writeb
#define __raw_writew writew
#define __raw_writel writel
#define __raw_readb readb
#define __raw_readw readw
#define __raw_readl readl
/*
* http://comments.gmane.org/gmane.linux.ports.arm.kernel/117626
*/
#define readb_relaxed __raw_readb
#define readw_relaxed __raw_readw
#define readl_relaxed __raw_readl
#define writeb_relaxed __raw_writeb
#define writew_relaxed __raw_writew
#define writel_relaxed __raw_writel
/*
* I/O memory mapping functions.
*/
#define _PAGE_IOREMAP (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
(__HEXAGON_C_DEV << 6))
#define __raw_writel writel
static inline void memcpy_fromio(void *dst, const volatile void __iomem *src,
int count)
{
memcpy(dst, (void *) src, count);
}
static inline void memcpy_toio(volatile void __iomem *dst, const void *src,
int count)
{
memcpy((void *) dst, src, count);
}
static inline void memset_io(volatile void __iomem *addr, int value,
size_t size)
{
memset((void __force *)addr, value, size);
}
#define PCI_IO_ADDR (volatile void __iomem *)
/*
* inb - read byte from I/O port or something
* @port: address in I/O space
*
* Operates on "I/O bus I/O space"
*/
static inline u8 inb(unsigned long port)
{
return readb(_IO_BASE + (port & IO_SPACE_LIMIT));
}
static inline u16 inw(unsigned long port)
{
return readw(_IO_BASE + (port & IO_SPACE_LIMIT));
}
static inline u32 inl(unsigned long port)
{
return readl(_IO_BASE + (port & IO_SPACE_LIMIT));
}
/*
* outb - write a byte to a memory location
* @data: data to write to
* @addr: address in I/O space
*/
static inline void outb(u8 data, unsigned long port)
{
writeb(data, _IO_BASE + (port & IO_SPACE_LIMIT));
}
static inline void outw(u16 data, unsigned long port)
{
writew(data, _IO_BASE + (port & IO_SPACE_LIMIT));
}
static inline void outl(u32 data, unsigned long port)
{
writel(data, _IO_BASE + (port & IO_SPACE_LIMIT));
}
#define outb_p outb
#define outw_p outw
#define outl_p outl
#define inb_p inb
#define inw_p inw
#define inl_p inl
static inline void insb(unsigned long port, void *buffer, int count)
{
if (count) {
u8 *buf = buffer;
do {
u8 x = inb(port);
*buf++ = x;
} while (--count);
}
}
static inline void insw(unsigned long port, void *buffer, int count)
{
if (count) {
u16 *buf = buffer;
do {
u16 x = inw(port);
*buf++ = x;
} while (--count);
}
}
static inline void insl(unsigned long port, void *buffer, int count)
{
if (count) {
u32 *buf = buffer;
do {
u32 x = inw(port);
*buf++ = x;
} while (--count);
}
}
static inline void outsb(unsigned long port, const void *buffer, int count)
{
if (count) {
const u8 *buf = buffer;
do {
outb(*buf++, port);
} while (--count);
}
}
static inline void outsw(unsigned long port, const void *buffer, int count)
{
if (count) {
const u16 *buf = buffer;
do {
outw(*buf++, port);
} while (--count);
}
}
static inline void outsl(unsigned long port, const void *buffer, int count)
{
if (count) {
const u32 *buf = buffer;
do {
outl(*buf++, port);
} while (--count);
}
}
/*
* These defines are necessary to use the generic io.h for filling in
* the missing parts of the API contract. This is because the platform
* uses (inline) functions rather than defines and the generic helper
* fills in the undefined.
*/
#define virt_to_phys virt_to_phys
#define phys_to_virt phys_to_virt
#define memset_io memset_io
#define memcpy_fromio memcpy_fromio
#define memcpy_toio memcpy_toio
#define readb readb
#define readw readw
#define readl readl
#define writeb writeb
#define writew writew
#define writel writel
#define insb insb
#define insw insw
#define insl insl
#define outsb outsb
#define outsw outsw
#define outsl outsl
#include <asm-generic/io.h>
#endif /* __KERNEL__ */
#endif
Codebase Browser
linux