#ifndef __ALPHA_IO_H #define __ALPHA_IO_H #ifdef __KERNEL__ #include #include #include #include #include #include /* The generic header contains only prototypes. Including it ensures that the implementation we have here matches that interface. */ #include /* We don't use IO slowdowns on the Alpha, but.. */ #define __SLOW_DOWN_IO do { } while (0) #define SLOW_DOWN_IO do { } while (0) /* * Virtual -> physical identity mapping starts at this offset */ #ifdef USE_48_BIT_KSEG #define IDENT_ADDR 0xffff800000000000UL #else #define IDENT_ADDR 0xfffffc0000000000UL #endif /* * We try to avoid hae updates (thus the cache), but when we * do need to update the hae, we need to do it atomically, so * that any interrupts wouldn't get confused with the hae * register not being up-to-date with respect to the hardware * value. */ extern inline void __set_hae(unsigned long new_hae) { unsigned long flags = swpipl(IPL_MAX); barrier(); alpha_mv.hae_cache = new_hae; *alpha_mv.hae_register = new_hae; mb(); /* Re-read to make sure it was written. */ new_hae = *alpha_mv.hae_register; setipl(flags); barrier(); } extern inline void set_hae(unsigned long new_hae) { if (new_hae != alpha_mv.hae_cache) __set_hae(new_hae); } /* * Change virtual addresses to physical addresses and vv. */ #ifdef USE_48_BIT_KSEG static inline unsigned long virt_to_phys(void *address) { return (unsigned long)address - IDENT_ADDR; } static inline void * phys_to_virt(unsigned long address) { return (void *) (address + IDENT_ADDR); } #else static inline unsigned long virt_to_phys(void *address) { unsigned long phys = (unsigned long)address; /* Sign-extend from bit 41. */ phys <<= (64 - 41); phys = (long)phys >> (64 - 41); /* Crop to the physical address width of the processor. */ phys &= (1ul << hwrpb->pa_bits) - 1; return phys; } static inline void * phys_to_virt(unsigned long address) { return (void *)(IDENT_ADDR + (address & ((1ul << 41) - 1))); } #endif #define page_to_phys(page) page_to_pa(page) static inline dma_addr_t __deprecated isa_page_to_bus(struct page *page) { return page_to_phys(page); } /* Maximum PIO space address supported? */ #define IO_SPACE_LIMIT 0xffff /* * Change addresses as seen by the kernel (virtual) to addresses as * seen by a device (bus), and vice versa. * * Note that this only works for a limited range of kernel addresses, * and very well may not span all memory. Consider this interface * deprecated in favour of the DMA-mapping API. */ extern unsigned long __direct_map_base; extern unsigned long __direct_map_size; static inline unsigned long __deprecated virt_to_bus(void *address) { unsigned long phys = virt_to_phys(address); unsigned long bus = phys + __direct_map_base; return phys <= __direct_map_size ? bus : 0; } #define isa_virt_to_bus virt_to_bus static inline void * __deprecated bus_to_virt(unsigned long address) { void *virt; /* This check is a sanity check but also ensures that bus address 0 maps to virtual address 0 which is useful to detect null pointers (the NCR driver is much simpler if NULL pointers are preserved). */ address -= __direct_map_base; virt = phys_to_virt(address); return (long)address <= 0 ? NULL : virt; } #define isa_bus_to_virt bus_to_virt /* * There are different chipsets to interface the Alpha CPUs to the world. */ #define IO_CONCAT(a,b) _IO_CONCAT(a,b) #define _IO_CONCAT(a,b) a ## _ ## b #ifdef CONFIG_ALPHA_GENERIC /* In a generic kernel, we always go through the machine vector. */ #define REMAP1(TYPE, NAME, QUAL) \ static inline TYPE generic_##NAME(QUAL void __iomem *addr) \ { \ return alpha_mv.mv_##NAME(addr); \ } #define REMAP2(TYPE, NAME, QUAL) \ static inline void generic_##NAME(TYPE b, QUAL void __iomem *addr) \ { \ alpha_mv.mv_##NAME(b, addr); \ } REMAP1(unsigned int, ioread8, /**/) REMAP1(unsigned int, ioread16, /**/) REMAP1(unsigned int, ioread32, /**/) REMAP1(u8, readb, const volatile) REMAP1(u16, readw, const volatile) REMAP1(u32, readl, const volatile) REMAP1(u64, readq, const volatile) REMAP2(u8, iowrite8, /**/) REMAP2(u16, iowrite16, /**/) REMAP2(u32, iowrite32, /**/) REMAP2(u8, writeb, volatile) REMAP2(u16, writew, volatile) REMAP2(u32, writel, volatile) REMAP2(u64, writeq, volatile) #undef REMAP1 #undef REMAP2 extern inline void __iomem *generic_ioportmap(unsigned long a) { return alpha_mv.mv_ioportmap(a); } static inline void __iomem *generic_ioremap(unsigned long a, unsigned long s) { return alpha_mv.mv_ioremap(a, s); } static inline void generic_iounmap(volatile void __iomem *a) { return alpha_mv.mv_iounmap(a); } static inline int generic_is_ioaddr(unsigned long a) { return alpha_mv.mv_is_ioaddr(a); } static inline int generic_is_mmio(const volatile void __iomem *a) { return alpha_mv.mv_is_mmio(a); } #define __IO_PREFIX generic #define generic_trivial_rw_bw 0 #define generic_trivial_rw_lq 0 #define generic_trivial_io_bw 0 #define generic_trivial_io_lq 0 #define generic_trivial_iounmap 0 #else #if defined(CONFIG_ALPHA_APECS) # include #elif defined(CONFIG_ALPHA_CIA) # include #elif defined(CONFIG_ALPHA_IRONGATE) # include #elif defined(CONFIG_ALPHA_JENSEN) # include #elif defined(CONFIG_ALPHA_LCA) # include #elif defined(CONFIG_ALPHA_MARVEL) # include #elif defined(CONFIG_ALPHA_MCPCIA) # include #elif defined(CONFIG_ALPHA_POLARIS) # include #elif defined(CONFIG_ALPHA_T2) # include #elif defined(CONFIG_ALPHA_TSUNAMI) # include #elif defined(CONFIG_ALPHA_TITAN) # include #elif defined(CONFIG_ALPHA_WILDFIRE) # include #else #error "What system is this?" #endif #endif /* GENERIC */ /* * We always have external versions of these routines. */ extern u8 inb(unsigned long port); extern u16 inw(unsigned long port); extern u32 inl(unsigned long port); extern void outb(u8 b, unsigned long port); extern void outw(u16 b, unsigned long port); extern void outl(u32 b, unsigned long port); extern u8 readb(const volatile void __iomem *addr); extern u16 readw(const volatile void __iomem *addr); extern u32 readl(const volatile void __iomem *addr); extern u64 readq(const volatile void __iomem *addr); extern void writeb(u8 b, volatile void __iomem *addr); extern void writew(u16 b, volatile void __iomem *addr); extern void writel(u32 b, volatile void __iomem *addr); extern void writeq(u64 b, volatile void __iomem *addr); extern u8 __raw_readb(const volatile void __iomem *addr); extern u16 __raw_readw(const volatile void __iomem *addr); extern u32 __raw_readl(const volatile void __iomem *addr); extern u64 __raw_readq(const volatile void __iomem *addr); extern void __raw_writeb(u8 b, volatile void __iomem *addr); extern void __raw_writew(u16 b, volatile void __iomem *addr); extern void __raw_writel(u32 b, volatile void __iomem *addr); extern void __raw_writeq(u64 b, volatile void __iomem *addr); /* * Mapping from port numbers to __iomem space is pretty easy. */ /* These two have to be extern inline because of the extern prototype from . It is not legal to mix "extern" and "static" for the same declaration. */ extern inline void __iomem *ioport_map(unsigned long port, unsigned int size) { return IO_CONCAT(__IO_PREFIX,ioportmap) (port); } extern inline void ioport_unmap(void __iomem *addr) { } static inline void __iomem *ioremap(unsigned long port, unsigned long size) { return IO_CONCAT(__IO_PREFIX,ioremap) (port, size); } static inline void __iomem *__ioremap(unsigned long port, unsigned long size, unsigned long flags) { return ioremap(port, size); } static inline void __iomem * ioremap_nocache(unsigned long offset, unsigned long size) { return ioremap(offset, size); } static inline void iounmap(volatile void __iomem *addr) { IO_CONCAT(__IO_PREFIX,iounmap)(addr); } static inline int __is_ioaddr(unsigned long addr) { return IO_CONCAT(__IO_PREFIX,is_ioaddr)(addr); } #define __is_ioaddr(a) __is_ioaddr((unsigned long)(a)) static inline int __is_mmio(const volatile void __iomem *addr) { return IO_CONCAT(__IO_PREFIX,is_mmio)(addr); } /* * If the actual I/O bits are sufficiently trivial, then expand inline. */ #if IO_CONCAT(__IO_PREFIX,trivial_io_bw) extern inline unsigned int ioread8(void __iomem *addr) { unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr); mb(); return ret; } extern inline unsigned int ioread16(void __iomem *addr) { unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr); mb(); return ret;