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