diff options
Diffstat (limited to 'arch/mips/include/asm/io.h')
| -rw-r--r-- | arch/mips/include/asm/io.h | 453 |
1 files changed, 191 insertions, 262 deletions
diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h index ecabc00c1e66..980187a83053 100644 --- a/arch/mips/include/asm/io.h +++ b/arch/mips/include/asm/io.h @@ -13,30 +13,21 @@ #define _ASM_IO_H #include <linux/compiler.h> -#include <linux/kernel.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-generic/iomap.h> #include <asm/page.h> #include <asm/pgtable-bits.h> -#include <asm/processor.h> #include <asm/string.h> - -#include <ioremap.h> #include <mangle-port.h> /* - * Slowdown I/O port space accesses for antique hardware. - */ -#undef CONF_SLOWDOWN_IO - -/* * 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 @@ -48,9 +39,17 @@ # define __raw_ioswabq(a, x) (x) # define ____raw_ioswabq(a, x) (x) -/* ioswab[bwlq], __mem_ioswab[bwlq] are defined in mangle-port.h */ +# 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 -#define IO_SPACE_LIMIT 0xffff +/* 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 @@ -58,51 +57,25 @@ * 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 - * on any sane architecture; generic code does not use this assumption. + * any sane architecture; generic code does not use this assumption. */ -extern const unsigned long mips_io_port_base; +extern unsigned long mips_io_port_base; -/* - * Gcc will generate code to load the value of mips_io_port_base after each - * function call which may be fairly wasteful in some cases. So we don't - * play quite by the book. We tell gcc mips_io_port_base is a long variable - * which solves the code generation issue. Now we need to violate the - * aliasing rules a little to make initialization possible and finally we - * will need the barrier() to fight side effects of the aliasing chat. - * This trickery will eventually collapse under gcc's optimizer. Oh well. - */ static inline void set_io_port_base(unsigned long base) { - * (unsigned long *) &mips_io_port_base = base; - barrier(); + mips_io_port_base = base; } /* - * Thanks to James van Artsdalen for a better timing-fix than - * the two short jumps: using outb's to a nonexistent port seems - * to guarantee better timings even on fast machines. - * - * On the other hand, I'd like to be sure of a non-existent port: - * I feel a bit unsafe about using 0x80 (should be safe, though) - * - * Linus - * + * 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 __SLOW_DOWN_IO \ - __asm__ __volatile__( \ - "sb\t$0,0x80(%0)" \ - : : "r" (mips_io_port_base)); - -#ifdef CONF_SLOWDOWN_IO -#ifdef REALLY_SLOW_IO -#define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; } -#else -#define SLOW_DOWN_IO __SLOW_DOWN_IO -#endif -#else -#define SLOW_DOWN_IO -#endif +#define iobarrier_rw() mb() +#define iobarrier_r() rmb() +#define iobarrier_w() wmb() +#define iobarrier_sync() iob() /* * virt_to_phys - map virtual addresses to physical @@ -116,110 +89,34 @@ static inline void set_io_port_base(unsigned long base) * almost all conceivable cases a device driver should not be using * this function */ -static inline unsigned long virt_to_phys(volatile const void *address) +static inline unsigned long __virt_to_phys_nodebug(volatile const void *address) { return __pa(address); } -/* - * phys_to_virt - map physical address to virtual - * @address: address to remap - * - * The returned virtual address is a current CPU mapping for - * the memory address given. It is only valid to use this function on - * addresses that have a kernel mapping - * - * This function does not handle bus mappings for DMA transfers. In - * almost all conceivable cases a device driver should not be using - * this function - */ -static inline void * phys_to_virt(unsigned long 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 (void *)(address + PAGE_OFFSET - PHYS_OFFSET); + 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 (unsigned long)address - PAGE_OFFSET; -} - -static inline void * isa_bus_to_virt(unsigned long address) +static inline unsigned long isa_virt_to_bus(volatile void *address) { - return (void *)(address + PAGE_OFFSET); + return virt_to_phys(address); } -#define isa_page_to_bus page_to_phys - -/* - * However PCI ones are not necessarily 1:1 and therefore these interfaces - * are forbidden in portable PCI drivers. - * - * Allow them for x86 for legacy drivers, though. - */ -#define virt_to_bus virt_to_phys -#define bus_to_virt phys_to_virt - -/* - * Change "struct page" to physical address. - */ -#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) - -extern void __iomem * __ioremap(phys_addr_t offset, phys_addr_t size, unsigned long flags); -extern void __iounmap(const volatile void __iomem *addr); - -#ifndef CONFIG_PCI -struct pci_dev; -static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) {} -#endif - -static inline void __iomem * __ioremap_mode(phys_addr_t offset, unsigned long size, - unsigned long flags) -{ - void __iomem *addr = plat_ioremap(offset, size, flags); - - if (addr) - return addr; - -#define __IS_LOW512(addr) (!((phys_addr_t)(addr) & (phys_addr_t) ~0x1fffffffULL)) - - if (cpu_has_64bit_addresses) { - u64 base = UNCAC_BASE; - - /* - * R10000 supports a 2 bit uncached attribute therefore - * UNCAC_BASE may not equal IO_BASE. - */ - if (flags == _CACHE_UNCACHED) - base = (u64) IO_BASE; - return (void __iomem *) (unsigned long) (base + offset); - } else if (__builtin_constant_p(offset) && - __builtin_constant_p(size) && __builtin_constant_p(flags)) { - phys_addr_t phys_addr, last_addr; - - phys_addr = fixup_bigphys_addr(offset, size); - - /* Don't allow wraparound or zero size. */ - last_addr = phys_addr + size - 1; - if (!size || last_addr < phys_addr) - return NULL; - - /* - * Map uncached objects in the low 512MB of address - * space using KSEG1. - */ - if (__IS_LOW512(phys_addr) && __IS_LOW512(last_addr) && - flags == _CACHE_UNCACHED) - return (void __iomem *) - (unsigned long)CKSEG1ADDR(phys_addr); - } - - return __ioremap(offset, size, flags); - -#undef __IS_LOW512 -} +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 @@ -233,84 +130,54 @@ static inline void __iomem * __ioremap_mode(phys_addr_t offset, unsigned long si * address. */ #define ioremap(offset, size) \ - __ioremap_mode((offset), (size), _CACHE_UNCACHED) + ioremap_prot((offset), (size), __pgprot(_CACHE_UNCACHED)) /* - * ioremap_nocache - map bus memory into CPU space - * @offset: bus address of the memory - * @size: size of the resource to map + * ioremap_cache - map bus memory into CPU space + * @offset: bus address of the memory + * @size: size of the resource to map * - * ioremap_nocache performs a platform specific sequence of operations to + * 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 uncachable - * on the CPU as well as honouring existing caching rules from things like - * the PCI bus. Note that there are other caches and buffers on many - * busses. In particular driver authors should read up on PCI writes - * - * It's useful if some control registers are in such an area and - * write combining or read caching is not desirable: + * 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_nocache(offset, size) \ - __ioremap_mode((offset), (size), _CACHE_UNCACHED) -#define ioremap_uc ioremap_nocache +#define ioremap_cache(offset, size) \ + ioremap_prot((offset), (size), __pgprot(_page_cachable_default)) /* - * ioremap_cachable - map bus memory into CPU space - * @offset: bus address of the memory - * @size: size of the resource to map + * ioremap_wc - map bus memory into CPU space + * @offset: bus address of the memory + * @size: size of the resource to map * - * ioremap_nocache performs a platform specific sequence of operations to + * 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 cachable by - * the CPU. Also enables full write-combining. Useful for some - * memory-like regions on I/O busses. - */ -#define ioremap_cachable(offset, size) \ - __ioremap_mode((offset), (size), _page_cachable_default) -#define ioremap_cache ioremap_cachable - -/* - * These two are MIPS specific ioremap variant. ioremap_cacheable_cow - * requests a cachable mapping, ioremap_uncached_accelerated requests a - * mapping using the uncached accelerated mode which isn't supported on - * all processors. + * 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_cacheable_cow(offset, size) \ - __ioremap_mode((offset), (size), _CACHE_CACHABLE_COW) -#define ioremap_uncached_accelerated(offset, size) \ - __ioremap_mode((offset), (size), _CACHE_UNCACHED_ACCELERATED) - -static inline void iounmap(const volatile void __iomem *addr) -{ - if (plat_iounmap(addr)) - return; +#define ioremap_wc(offset, size) \ + ioremap_prot((offset), (size), __pgprot(boot_cpu_data.writecombine)) -#define __IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == CKSEG1) - - if (cpu_has_64bit_addresses || - (__builtin_constant_p(addr) && __IS_KSEG1(addr))) - return; - - __iounmap(addr); - -#undef __IS_KSEG1 -} - -#if defined(CONFIG_CPU_CAVIUM_OCTEON) || defined(CONFIG_LOONGSON3_ENHANCEMENT) +#if defined(CONFIG_CPU_CAVIUM_OCTEON) #define war_io_reorder_wmb() wmb() #else -#define war_io_reorder_wmb() do { } while (0) +#define war_io_reorder_wmb() barrier() #endif -#define __BUILD_MEMORY_SINGLE(pfx, bwlq, type, irq) \ +#define __BUILD_MEMORY_SINGLE(pfx, bwlq, type, barrier, relax, irq) \ \ static inline void pfx##write##bwlq(type val, \ volatile void __iomem *mem) \ @@ -318,7 +185,10 @@ static inline void pfx##write##bwlq(type val, \ volatile type *__mem; \ type __val; \ \ - war_io_reorder_wmb(); \ + if (barrier) \ + iobarrier_rw(); \ + else \ + war_io_reorder_wmb(); \ \ __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \ \ @@ -333,13 +203,14 @@ static inline void pfx##write##bwlq(type val, \ if (irq) \ local_irq_save(__flags); \ __asm__ __volatile__( \ - ".set arch=r4000" "\t\t# __writeq""\n\t" \ + ".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 mips0" "\n" \ + ".set pop" "\n" \ : "=r" (__tmp) \ : "0" (__val), "m" (*__mem)); \ if (irq) \ @@ -355,6 +226,9 @@ static inline type pfx##read##bwlq(const volatile void __iomem *mem) \ \ __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) { \ @@ -363,11 +237,12 @@ static inline type pfx##read##bwlq(const volatile void __iomem *mem) \ if (irq) \ local_irq_save(__flags); \ __asm__ __volatile__( \ - ".set arch=r4000" "\t\t# __readq" "\n\t" \ + ".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 mips0" "\n" \ + ".set pop" "\n" \ : "=r" (__val) \ : "m" (*__mem)); \ if (irq) \ @@ -377,17 +252,23 @@ static inline type pfx##read##bwlq(const volatile void __iomem *mem) \ BUG(); \ } \ \ + /* prevent prefetching of coherent DMA data prematurely */ \ + if (!relax) \ + rmb(); \ return pfx##ioswab##bwlq(__mem, __val); \ } -#define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p, slow) \ +#define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, barrier, relax) \ \ -static inline void pfx##out##bwlq##p(type val, unsigned long port) \ +static inline void pfx##out##bwlq(type val, unsigned long port) \ { \ volatile type *__addr; \ type __val; \ \ - war_io_reorder_wmb(); \ + if (barrier) \ + iobarrier_rw(); \ + else \ + war_io_reorder_wmb(); \ \ __addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \ \ @@ -397,10 +278,9 @@ static inline void pfx##out##bwlq##p(type val, unsigned long port) \ BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \ \ *__addr = __val; \ - slow; \ } \ \ -static inline type pfx##in##bwlq##p(unsigned long port) \ +static inline type pfx##in##bwlq(unsigned long port) \ { \ volatile type *__addr; \ type __val; \ @@ -409,33 +289,43 @@ static inline type pfx##in##bwlq##p(unsigned long port) \ \ BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \ \ + if (barrier) \ + iobarrier_rw(); \ + \ __val = *__addr; \ - slow; \ \ + /* prevent prefetching of coherent DMA data prematurely */ \ + if (!relax) \ + rmb(); \ return pfx##ioswab##bwlq(__addr, __val); \ } -#define __BUILD_MEMORY_PFX(bus, bwlq, type) \ +#define __BUILD_MEMORY_PFX(bus, bwlq, type, relax) \ \ -__BUILD_MEMORY_SINGLE(bus, bwlq, type, 1) +__BUILD_MEMORY_SINGLE(bus, bwlq, type, 1, relax, 1) #define BUILDIO_MEM(bwlq, type) \ \ -__BUILD_MEMORY_PFX(__raw_, bwlq, type) \ -__BUILD_MEMORY_PFX(, bwlq, type) \ -__BUILD_MEMORY_PFX(__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, ,) \ - __BUILD_IOPORT_SINGLE(bus, bwlq, type, _p, SLOW_DOWN_IO) + __BUILD_IOPORT_SINGLE(bus, bwlq, type, 1, 0) #define BUILDIO_IOPORT(bwlq, type) \ - __BUILD_IOPORT_PFX(, bwlq, type) \ + __BUILD_IOPORT_PFX(_, bwlq, type) \ __BUILD_IOPORT_PFX(__mem_, bwlq, type) BUILDIO_IOPORT(b, u8) @@ -447,19 +337,23 @@ BUILDIO_IOPORT(q, u64) #define __BUILDIO(bwlq, type) \ \ -__BUILD_MEMORY_SINGLE(____raw_, bwlq, type, 0) +__BUILD_MEMORY_SINGLE(____raw_, bwlq, type, 1, 0, 0) __BUILDIO(q, u64) -#define readb_relaxed readb -#define readw_relaxed readw -#define readl_relaxed readl -#define readq_relaxed readq +#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 writeb -#define writew_relaxed writew -#define writel_relaxed writel -#define writeq_relaxed writeq +#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)) @@ -479,12 +373,6 @@ __BUILDIO(q, u64) #define writeq_be(val, addr) \ __raw_writeq(cpu_to_be64((val)), (__force unsigned *)(addr)) -/* - * Some code tests for these symbols - */ -#define readq readq -#define writeq writeq - #define __BUILD_MEMORY_STRING(bwlq, type) \ \ static inline void writes##bwlq(volatile void __iomem *mem, \ @@ -498,8 +386,8 @@ static inline void writes##bwlq(volatile void __iomem *mem, \ } \ } \ \ -static inline void reads##bwlq(volatile void __iomem *mem, void *addr, \ - unsigned int count) \ +static inline void reads##bwlq(const volatile void __iomem *mem, \ + void *addr, unsigned int count) \ { \ volatile type *__addr = addr; \ \ @@ -546,26 +434,6 @@ BUILDSTRING(q, u64) #endif -#ifdef CONFIG_CPU_CAVIUM_OCTEON -#define mmiowb() wmb() -#else -/* Depends on MIPS II instruction set */ -#define mmiowb() asm volatile ("sync" ::: "memory") -#endif - -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); -} - /* * The caches on some architectures aren't dma-coherent and have need to * handle this in software. There are three types of operations that @@ -586,7 +454,7 @@ static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int * * This API used to be exported; it now is for arch code internal use only. */ -#if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT) +#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); @@ -605,7 +473,7 @@ extern void (*_dma_cache_inv)(unsigned long start, unsigned long size); #define dma_cache_inv(start,size) \ do { (void) (start); (void) (size); } while (0) -#endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */ +#endif /* CONFIG_DMA_NONCOHERENT */ /* * Read a 32-bit register that requires a 64-bit read cycle on the bus. @@ -621,15 +489,76 @@ extern void (*_dma_cache_inv)(unsigned long start, unsigned long size); #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)) -/* - * Convert a physical pointer to a virtual kernel pointer for /dev/mem - * access - */ -#define xlate_dev_mem_ptr(p) __va(p) +#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 -/* - * Convert a virtual cached pointer to an uncached pointer - */ -#define xlate_dev_kmem_ptr(p) p +#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 */ |