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Diffstat (limited to 'include/asm-mips/io.h')
| -rw-r--r-- | include/asm-mips/io.h | 630 |
1 files changed, 630 insertions, 0 deletions
diff --git a/include/asm-mips/io.h b/include/asm-mips/io.h new file mode 100644 index 00000000000..039845f2e6b --- /dev/null +++ b/include/asm-mips/io.h @@ -0,0 +1,630 @@ +/* + * 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 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/config.h> +#include <linux/compiler.h> +#include <linux/kernel.h> +#include <linux/types.h> + +#include <asm/addrspace.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/processor.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 + * execute in place. + */ +# define __raw_ioswabb(x) (x) +# define __raw_ioswabw(x) (x) +# define __raw_ioswabl(x) (x) +# define __raw_ioswabq(x) (x) + +/* + * Sane hardware offers swapping of PCI/ISA I/O space accesses in hardware; + * less sane hardware forces software to fiddle with this... + */ +#if defined(CONFIG_SWAP_IO_SPACE) + +# define ioswabb(x) (x) +# ifdef CONFIG_SGI_IP22 +/* + * IP22 seems braindead enough to swap 16bits values in hardware, but + * not 32bits. Go figure... Can't tell without documentation. + */ +# define ioswabw(x) (x) +# else +# define ioswabw(x) le16_to_cpu(x) +# endif +# define ioswabl(x) le32_to_cpu(x) +# define ioswabq(x) le64_to_cpu(x) + +#else + +# define ioswabb(x) (x) +# define ioswabw(x) (x) +# define ioswabl(x) (x) +# define ioswabq(x) (x) + +#endif + +/* + * Native bus accesses never swapped. + */ +#define bus_ioswabb(x) (x) +#define bus_ioswabw(x) (x) +#define bus_ioswabl(x) (x) +#define bus_ioswabq(x) (x) + +#define __bus_ioswabq bus_ioswabq + +#define IO_SPACE_LIMIT 0xffff + +/* + * 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 + * on any sane architecture; generic code does not use this assumption. + */ +extern const unsigned long mips_io_port_base; + +#define set_io_port_base(base) \ + do { * (unsigned long *) &mips_io_port_base = (base); } while (0) + +/* + * 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 + * + */ + +#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 + +/* + * 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(volatile void * address) +{ + return (unsigned long)address - PAGE_OFFSET; +} + +/* + * 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) +{ + return (void *)(address + PAGE_OFFSET); +} + +/* + * 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) +{ + return (void *)(address + PAGE_OFFSET); +} + +#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 + +/* + * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped + * for the processor. This implies the assumption that there is only + * one of these busses. + */ +extern unsigned long isa_slot_offset; + +/* + * Change "struct page" to physical address. + */ +#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) + +extern void * __ioremap(phys_t offset, phys_t size, unsigned long flags); +extern void __iounmap(volatile void __iomem *addr); + +static inline void * __ioremap_mode(phys_t offset, unsigned long size, + unsigned long flags) +{ + 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 *) (unsigned long) (base + offset); + } + + return __ioremap(offset, size, flags); +} + +/* + * 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_mode((offset), (size), _CACHE_UNCACHED) + +/* + * ioremap_nocache - 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 + * 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 paticular 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: + */ +#define ioremap_nocache(offset, size) \ + __ioremap_mode((offset), (size), _CACHE_UNCACHED) + +/* + * 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. + */ +#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(volatile void __iomem *addr) +{ + if (cpu_has_64bit_addresses) + return; + + __iounmap(addr); +} + + +#define __BUILD_MEMORY_SINGLE(pfx, bwlq, type, irq) \ + \ +static inline void pfx##write##bwlq(type val, \ + volatile void __iomem *mem) \ +{ \ + volatile type *__mem; \ + type __val; \ + \ + __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \ + \ + __val = pfx##ioswab##bwlq(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 mips3" "\t\t# __writeq""\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" \ + : "=r" (__tmp) \ + : "0" (__val), "m" (*__mem)); \ + if (irq) \ + local_irq_restore(__flags); \ + } else \ + BUG(); \ +} \ + \ +static inline type pfx##read##bwlq(volatile void __iomem *mem) \ +{ \ + volatile type *__mem; \ + type __val; \ + \ + __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \ + \ + if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \ + __val = *__mem; \ + else if (cpu_has_64bits) { \ + unsigned long __flags; \ + \ + local_irq_save(__flags); \ + __asm__ __volatile__( \ + ".set mips3" "\t\t# __readq" "\n\t" \ + "ld %L0, %1" "\n\t" \ + "dsra32 %M0, %L0, 0" "\n\t" \ + "sll %L0, %L0, 0" "\n\t" \ + ".set mips0" "\n" \ + : "=r" (__val) \ + : "m" (*__mem)); \ + local_irq_restore(__flags); \ + } else { \ + __val = 0; \ + BUG(); \ + } \ + \ + return pfx##ioswab##bwlq(__val); \ +} + +#define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p, slow) \ + \ +static inline void pfx##out##bwlq##p(type val, unsigned long port) \ +{ \ + volatile type *__addr; \ + type __val; \ + \ + port = __swizzle_addr_##bwlq(port); \ + __addr = (void *)(mips_io_port_base + port); \ + \ + __val = pfx##ioswab##bwlq(val); \ + \ + if (sizeof(type) != sizeof(u64)) { \ + *__addr = __val; \ + slow; \ + } else \ + BUILD_BUG(); \ +} \ + \ +static inline type pfx##in##bwlq##p(unsigned long port) \ +{ \ + volatile type *__addr; \ + type __val; \ + \ + port = __swizzle_addr_##bwlq(port); \ + __addr = (void *)(mips_io_port_base + port); \ + \ + if (sizeof(type) != sizeof(u64)) { \ + __val = *__addr; \ + slow; \ + } else { \ + __val = 0; \ + BUILD_BUG(); \ + } \ + \ + return pfx##ioswab##bwlq(__val); \ +} + +#define __BUILD_MEMORY_PFX(bus, bwlq, type) \ + \ +__BUILD_MEMORY_SINGLE(bus, bwlq, type, 1) + +#define __BUILD_IOPORT_PFX(bus, bwlq, type) \ + \ +__BUILD_IOPORT_SINGLE(bus, bwlq, type, ,) \ +__BUILD_IOPORT_SINGLE(bus, bwlq, type, _p, SLOW_DOWN_IO) + +#define BUILDIO(bwlq, type) \ + \ +__BUILD_MEMORY_PFX(, bwlq, type) \ +__BUILD_MEMORY_PFX(__raw_, bwlq, type) \ +__BUILD_MEMORY_PFX(bus_, bwlq, type) \ +__BUILD_IOPORT_PFX(, bwlq, type) \ +__BUILD_IOPORT_PFX(__raw_, bwlq, type) + +#define __BUILDIO(bwlq, type) \ + \ +__BUILD_MEMORY_SINGLE(__bus_, bwlq, type, 0) + +BUILDIO(b, u8) +BUILDIO(w, u16) +BUILDIO(l, u32) +BUILDIO(q, u64) + +__BUILDIO(q, u64) + +#define readb_relaxed readb +#define readw_relaxed readw +#define readl_relaxed readl +#define readq_relaxed readq + +/* + * 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, void *addr, \ + unsigned int count) \ +{ \ + volatile type *__addr = addr; \ + \ + while (count--) { \ + __raw_write##bwlq(*__addr, mem); \ + __addr++; \ + } \ +} \ + \ +static inline void reads##bwlq(volatile void __iomem *mem, void *addr, \ + unsigned int count) \ +{ \ + volatile type *__addr = addr; \ + \ + while (count--) { \ + *__addr = __raw_read##bwlq(mem); \ + __addr++; \ + } \ +} + +#define __BUILD_IOPORT_STRING(bwlq, type) \ + \ +static inline void outs##bwlq(unsigned long port, void *addr, \ + unsigned int count) \ +{ \ + volatile type *__addr = addr; \ + \ + while (count--) { \ + __raw_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 = __raw_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) +BUILDSTRING(q, u64) + + +/* Depends on MIPS II instruction set */ +#define mmiowb() asm volatile ("sync" ::: "memory") + +#define memset_io(a,b,c) memset((void *)(a),(b),(c)) +#define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c)) +#define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c)) + +/* + * Memory Mapped I/O + */ +#define ioread8(addr) readb(addr) +#define ioread16(addr) readw(addr) +#define ioread32(addr) readl(addr) + +#define iowrite8(b,addr) writeb(b,addr) +#define iowrite16(w,addr) writew(w,addr) +#define iowrite32(l,addr) writel(l,addr) + +#define ioread8_rep(a,b,c) readsb(a,b,c) +#define ioread16_rep(a,b,c) readsw(a,b,c) +#define ioread32_rep(a,b,c) readsl(a,b,c) + +#define iowrite8_rep(a,b,c) writesb(a,b,c) +#define iowrite16_rep(a,b,c) writesw(a,b,c) +#define iowrite32_rep(a,b,c) writesl(a,b,c) + +/* Create a virtual mapping cookie for an IO port range */ +extern void __iomem *ioport_map(unsigned long port, unsigned int nr); +extern void ioport_unmap(void __iomem *); + +/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */ +struct pci_dev; +extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max); +extern void pci_iounmap(struct pci_dev *dev, void __iomem *); + +/* + * ISA space is 'always mapped' on currently supported MIPS systems, no need + * to explicitly ioremap() it. The fact that the ISA IO space is mapped + * to PAGE_OFFSET is pure coincidence - it does not mean ISA values + * are physical addresses. The following constant pointer can be + * used as the IO-area pointer (it can be iounmapped as well, so the + * analogy with PCI is quite large): + */ +#define __ISA_IO_base ((char *)(isa_slot_offset)) + +#define isa_readb(a) readb(__ISA_IO_base + (a)) +#define isa_readw(a) readw(__ISA_IO_base + (a)) +#define isa_readl(a) readl(__ISA_IO_base + (a)) +#define isa_readq(a) readq(__ISA_IO_base + (a)) +#define isa_writeb(b,a) writeb(b,__ISA_IO_base + (a)) +#define isa_writew(w,a) writew(w,__ISA_IO_base + (a)) +#define isa_writel(l,a) writel(l,__ISA_IO_base + (a)) +#define isa_writeq(q,a) writeq(q,__ISA_IO_base + (a)) +#define isa_memset_io(a,b,c) memset_io(__ISA_IO_base + (a),(b),(c)) +#define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),__ISA_IO_base + (b),(c)) +#define isa_memcpy_toio(a,b,c) memcpy_toio(__ISA_IO_base + (a),(b),(c)) + +/* + * We don't have csum_partial_copy_fromio() yet, so we cheat here and + * just copy it. The net code will then do the checksum later. + */ +#define eth_io_copy_and_sum(skb,src,len,unused) memcpy_fromio((skb)->data,(src),(len)) +#define isa_eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(b),(c),(d)) + +/* + * check_signature - find BIOS signatures + * @io_addr: mmio address to check + * @signature: signature block + * @length: length of signature + * + * Perform a signature comparison with the mmio address io_addr. This + * address should have been obtained by ioremap. + * Returns 1 on a match. + */ +static inline int check_signature(char __iomem *io_addr, + const unsigned char *signature, int length) +{ + int retval = 0; + do { + if (readb(io_addr) != *signature) + goto out; + io_addr++; + signature++; + length--; + } while (length); + retval = 1; +out: + return retval; +} + +/* + * 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. + */ +#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)) + +/* + * 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 /* _ASM_IO_H */ |