584 lines
14 KiB
C
584 lines
14 KiB
C
#ifndef __ALPHA_IO_H
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#define __ALPHA_IO_H
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#ifdef __KERNEL__
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <asm/compiler.h>
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#include <asm/system.h>
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#include <asm/pgtable.h>
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#include <asm/machvec.h>
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#include <asm/hwrpb.h>
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/* The generic header contains only prototypes. Including it ensures that
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the implementation we have here matches that interface. */
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#include <asm-generic/iomap.h>
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/* We don't use IO slowdowns on the Alpha, but.. */
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#define __SLOW_DOWN_IO do { } while (0)
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#define SLOW_DOWN_IO do { } while (0)
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/*
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* Virtual -> physical identity mapping starts at this offset
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*/
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#ifdef USE_48_BIT_KSEG
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#define IDENT_ADDR 0xffff800000000000UL
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#else
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#define IDENT_ADDR 0xfffffc0000000000UL
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#endif
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/*
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* We try to avoid hae updates (thus the cache), but when we
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* do need to update the hae, we need to do it atomically, so
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* that any interrupts wouldn't get confused with the hae
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* register not being up-to-date with respect to the hardware
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* value.
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*/
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static inline void __set_hae(unsigned long new_hae)
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{
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unsigned long flags;
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local_irq_save(flags);
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alpha_mv.hae_cache = new_hae;
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*alpha_mv.hae_register = new_hae;
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mb();
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/* Re-read to make sure it was written. */
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new_hae = *alpha_mv.hae_register;
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local_irq_restore(flags);
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}
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static inline void set_hae(unsigned long new_hae)
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{
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if (new_hae != alpha_mv.hae_cache)
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__set_hae(new_hae);
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}
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/*
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* Change virtual addresses to physical addresses and vv.
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*/
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#ifdef USE_48_BIT_KSEG
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static inline unsigned long virt_to_phys(void *address)
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{
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return (unsigned long)address - IDENT_ADDR;
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}
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static inline void * phys_to_virt(unsigned long address)
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{
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return (void *) (address + IDENT_ADDR);
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}
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#else
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static inline unsigned long virt_to_phys(void *address)
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{
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unsigned long phys = (unsigned long)address;
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/* Sign-extend from bit 41. */
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phys <<= (64 - 41);
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phys = (long)phys >> (64 - 41);
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/* Crop to the physical address width of the processor. */
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phys &= (1ul << hwrpb->pa_bits) - 1;
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return phys;
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}
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static inline void * phys_to_virt(unsigned long address)
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{
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return (void *)(IDENT_ADDR + (address & ((1ul << 41) - 1)));
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}
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#endif
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#define page_to_phys(page) page_to_pa(page)
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static inline dma_addr_t __deprecated isa_page_to_bus(struct page *page)
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{
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return page_to_phys(page);
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}
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/* This depends on working iommu. */
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#define BIO_VMERGE_BOUNDARY (alpha_mv.mv_pci_tbi ? PAGE_SIZE : 0)
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/* Maximum PIO space address supported? */
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#define IO_SPACE_LIMIT 0xffff
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/*
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* Change addresses as seen by the kernel (virtual) to addresses as
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* seen by a device (bus), and vice versa.
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*
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* Note that this only works for a limited range of kernel addresses,
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* and very well may not span all memory. Consider this interface
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* deprecated in favour of the DMA-mapping API.
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*/
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extern unsigned long __direct_map_base;
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extern unsigned long __direct_map_size;
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static inline unsigned long __deprecated virt_to_bus(void *address)
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{
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unsigned long phys = virt_to_phys(address);
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unsigned long bus = phys + __direct_map_base;
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return phys <= __direct_map_size ? bus : 0;
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}
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#define isa_virt_to_bus virt_to_bus
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static inline void * __deprecated bus_to_virt(unsigned long address)
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{
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void *virt;
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/* This check is a sanity check but also ensures that bus address 0
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maps to virtual address 0 which is useful to detect null pointers
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(the NCR driver is much simpler if NULL pointers are preserved). */
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address -= __direct_map_base;
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virt = phys_to_virt(address);
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return (long)address <= 0 ? NULL : virt;
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}
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#define isa_bus_to_virt bus_to_virt
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/*
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* There are different chipsets to interface the Alpha CPUs to the world.
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*/
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#define IO_CONCAT(a,b) _IO_CONCAT(a,b)
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#define _IO_CONCAT(a,b) a ## _ ## b
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#ifdef CONFIG_ALPHA_GENERIC
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/* In a generic kernel, we always go through the machine vector. */
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#define REMAP1(TYPE, NAME, QUAL) \
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static inline TYPE generic_##NAME(QUAL void __iomem *addr) \
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{ \
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return alpha_mv.mv_##NAME(addr); \
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}
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#define REMAP2(TYPE, NAME, QUAL) \
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static inline void generic_##NAME(TYPE b, QUAL void __iomem *addr) \
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{ \
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alpha_mv.mv_##NAME(b, addr); \
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}
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REMAP1(unsigned int, ioread8, /**/)
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REMAP1(unsigned int, ioread16, /**/)
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REMAP1(unsigned int, ioread32, /**/)
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REMAP1(u8, readb, const volatile)
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REMAP1(u16, readw, const volatile)
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REMAP1(u32, readl, const volatile)
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REMAP1(u64, readq, const volatile)
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REMAP2(u8, iowrite8, /**/)
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REMAP2(u16, iowrite16, /**/)
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REMAP2(u32, iowrite32, /**/)
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REMAP2(u8, writeb, volatile)
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REMAP2(u16, writew, volatile)
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REMAP2(u32, writel, volatile)
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REMAP2(u64, writeq, volatile)
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#undef REMAP1
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#undef REMAP2
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static inline void __iomem *generic_ioportmap(unsigned long a)
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{
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return alpha_mv.mv_ioportmap(a);
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}
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static inline void __iomem *generic_ioremap(unsigned long a, unsigned long s)
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{
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return alpha_mv.mv_ioremap(a, s);
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}
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static inline void generic_iounmap(volatile void __iomem *a)
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{
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return alpha_mv.mv_iounmap(a);
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}
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static inline int generic_is_ioaddr(unsigned long a)
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{
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return alpha_mv.mv_is_ioaddr(a);
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}
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static inline int generic_is_mmio(const volatile void __iomem *a)
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{
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return alpha_mv.mv_is_mmio(a);
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}
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#define __IO_PREFIX generic
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#define generic_trivial_rw_bw 0
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#define generic_trivial_rw_lq 0
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#define generic_trivial_io_bw 0
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#define generic_trivial_io_lq 0
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#define generic_trivial_iounmap 0
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#else
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#if defined(CONFIG_ALPHA_APECS)
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# include <asm/core_apecs.h>
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#elif defined(CONFIG_ALPHA_CIA)
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# include <asm/core_cia.h>
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#elif defined(CONFIG_ALPHA_IRONGATE)
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# include <asm/core_irongate.h>
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#elif defined(CONFIG_ALPHA_JENSEN)
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# include <asm/jensen.h>
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#elif defined(CONFIG_ALPHA_LCA)
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# include <asm/core_lca.h>
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#elif defined(CONFIG_ALPHA_MARVEL)
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# include <asm/core_marvel.h>
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#elif defined(CONFIG_ALPHA_MCPCIA)
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# include <asm/core_mcpcia.h>
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#elif defined(CONFIG_ALPHA_POLARIS)
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# include <asm/core_polaris.h>
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#elif defined(CONFIG_ALPHA_T2)
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# include <asm/core_t2.h>
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#elif defined(CONFIG_ALPHA_TSUNAMI)
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# include <asm/core_tsunami.h>
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#elif defined(CONFIG_ALPHA_TITAN)
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# include <asm/core_titan.h>
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#elif defined(CONFIG_ALPHA_WILDFIRE)
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# include <asm/core_wildfire.h>
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#else
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#error "What system is this?"
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#endif
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#endif /* GENERIC */
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/*
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* We always have external versions of these routines.
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*/
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extern u8 inb(unsigned long port);
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extern u16 inw(unsigned long port);
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extern u32 inl(unsigned long port);
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extern void outb(u8 b, unsigned long port);
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extern void outw(u16 b, unsigned long port);
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extern void outl(u32 b, unsigned long port);
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extern u8 readb(const volatile void __iomem *addr);
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extern u16 readw(const volatile void __iomem *addr);
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extern u32 readl(const volatile void __iomem *addr);
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extern u64 readq(const volatile void __iomem *addr);
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extern void writeb(u8 b, volatile void __iomem *addr);
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extern void writew(u16 b, volatile void __iomem *addr);
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extern void writel(u32 b, volatile void __iomem *addr);
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extern void writeq(u64 b, volatile void __iomem *addr);
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extern u8 __raw_readb(const volatile void __iomem *addr);
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extern u16 __raw_readw(const volatile void __iomem *addr);
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extern u32 __raw_readl(const volatile void __iomem *addr);
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extern u64 __raw_readq(const volatile void __iomem *addr);
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extern void __raw_writeb(u8 b, volatile void __iomem *addr);
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extern void __raw_writew(u16 b, volatile void __iomem *addr);
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extern void __raw_writel(u32 b, volatile void __iomem *addr);
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extern void __raw_writeq(u64 b, volatile void __iomem *addr);
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/*
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* Mapping from port numbers to __iomem space is pretty easy.
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*/
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/* These two have to be extern inline because of the extern prototype from
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<asm-generic/iomap.h>. It is not legal to mix "extern" and "static" for
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the same declaration. */
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extern inline void __iomem *ioport_map(unsigned long port, unsigned int size)
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{
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return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
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}
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extern inline void ioport_unmap(void __iomem *addr)
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{
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}
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static inline void __iomem *ioremap(unsigned long port, unsigned long size)
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{
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return IO_CONCAT(__IO_PREFIX,ioremap) (port, size);
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}
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static inline void __iomem *__ioremap(unsigned long port, unsigned long size,
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unsigned long flags)
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{
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return ioremap(port, size);
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}
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static inline void __iomem * ioremap_nocache(unsigned long offset,
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unsigned long size)
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{
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return ioremap(offset, size);
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}
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static inline void iounmap(volatile void __iomem *addr)
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{
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IO_CONCAT(__IO_PREFIX,iounmap)(addr);
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}
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static inline int __is_ioaddr(unsigned long addr)
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{
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return IO_CONCAT(__IO_PREFIX,is_ioaddr)(addr);
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}
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#define __is_ioaddr(a) __is_ioaddr((unsigned long)(a))
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static inline int __is_mmio(const volatile void __iomem *addr)
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{
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return IO_CONCAT(__IO_PREFIX,is_mmio)(addr);
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}
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/*
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* If the actual I/O bits are sufficiently trivial, then expand inline.
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*/
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#if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
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extern inline unsigned int ioread8(void __iomem *addr)
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{
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unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
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mb();
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return ret;
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}
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extern inline unsigned int ioread16(void __iomem *addr)
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{
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unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
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mb();
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return ret;
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}
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extern inline void iowrite8(u8 b, void __iomem *addr)
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{
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IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
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mb();
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}
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extern inline void iowrite16(u16 b, void __iomem *addr)
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{
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IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
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mb();
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}
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extern inline u8 inb(unsigned long port)
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{
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return ioread8(ioport_map(port, 1));
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}
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extern inline u16 inw(unsigned long port)
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{
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return ioread16(ioport_map(port, 2));
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}
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extern inline void outb(u8 b, unsigned long port)
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{
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iowrite8(b, ioport_map(port, 1));
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}
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extern inline void outw(u16 b, unsigned long port)
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{
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iowrite16(b, ioport_map(port, 2));
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}
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#endif
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#if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
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extern inline unsigned int ioread32(void __iomem *addr)
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{
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unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
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mb();
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return ret;
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}
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extern inline void iowrite32(u32 b, void __iomem *addr)
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{
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IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
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mb();
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}
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extern inline u32 inl(unsigned long port)
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{
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return ioread32(ioport_map(port, 4));
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}
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extern inline void outl(u32 b, unsigned long port)
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{
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iowrite32(b, ioport_map(port, 4));
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}
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#endif
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#if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
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extern inline u8 __raw_readb(const volatile void __iomem *addr)
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{
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return IO_CONCAT(__IO_PREFIX,readb)(addr);
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}
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extern inline u16 __raw_readw(const volatile void __iomem *addr)
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{
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return IO_CONCAT(__IO_PREFIX,readw)(addr);
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}
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extern inline void __raw_writeb(u8 b, volatile void __iomem *addr)
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{
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IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
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}
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extern inline void __raw_writew(u16 b, volatile void __iomem *addr)
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{
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IO_CONCAT(__IO_PREFIX,writew)(b, addr);
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}
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extern inline u8 readb(const volatile void __iomem *addr)
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{
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u8 ret = __raw_readb(addr);
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mb();
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return ret;
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}
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extern inline u16 readw(const volatile void __iomem *addr)
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{
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u16 ret = __raw_readw(addr);
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mb();
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return ret;
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}
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extern inline void writeb(u8 b, volatile void __iomem *addr)
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{
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__raw_writeb(b, addr);
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mb();
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}
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extern inline void writew(u16 b, volatile void __iomem *addr)
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{
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__raw_writew(b, addr);
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mb();
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}
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#endif
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#if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1
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extern inline u32 __raw_readl(const volatile void __iomem *addr)
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{
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return IO_CONCAT(__IO_PREFIX,readl)(addr);
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}
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extern inline u64 __raw_readq(const volatile void __iomem *addr)
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{
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return IO_CONCAT(__IO_PREFIX,readq)(addr);
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}
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extern inline void __raw_writel(u32 b, volatile void __iomem *addr)
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{
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IO_CONCAT(__IO_PREFIX,writel)(b, addr);
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}
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extern inline void __raw_writeq(u64 b, volatile void __iomem *addr)
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{
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IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
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}
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extern inline u32 readl(const volatile void __iomem *addr)
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{
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u32 ret = __raw_readl(addr);
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mb();
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return ret;
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}
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extern inline u64 readq(const volatile void __iomem *addr)
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{
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u64 ret = __raw_readq(addr);
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mb();
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return ret;
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}
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extern inline void writel(u32 b, volatile void __iomem *addr)
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{
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__raw_writel(b, addr);
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mb();
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}
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extern inline void writeq(u64 b, volatile void __iomem *addr)
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{
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__raw_writeq(b, addr);
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mb();
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}
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#endif
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#define inb_p inb
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#define inw_p inw
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#define inl_p inl
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#define outb_p outb
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#define outw_p outw
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#define outl_p outl
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#define readb_relaxed(addr) __raw_readb(addr)
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#define readw_relaxed(addr) __raw_readw(addr)
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#define readl_relaxed(addr) __raw_readl(addr)
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#define readq_relaxed(addr) __raw_readq(addr)
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#define mmiowb()
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/*
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* String version of IO memory access ops:
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*/
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extern void memcpy_fromio(void *, const volatile void __iomem *, long);
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extern void memcpy_toio(volatile void __iomem *, const void *, long);
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extern void _memset_c_io(volatile void __iomem *, unsigned long, long);
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static inline void memset_io(volatile void __iomem *addr, u8 c, long len)
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{
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_memset_c_io(addr, 0x0101010101010101UL * c, len);
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}
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#define __HAVE_ARCH_MEMSETW_IO
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static inline void memsetw_io(volatile void __iomem *addr, u16 c, long len)
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{
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_memset_c_io(addr, 0x0001000100010001UL * c, len);
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}
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/*
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* String versions of in/out ops:
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*/
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extern void insb (unsigned long port, void *dst, unsigned long count);
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extern void insw (unsigned long port, void *dst, unsigned long count);
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extern void insl (unsigned long port, void *dst, unsigned long count);
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extern void outsb (unsigned long port, const void *src, unsigned long count);
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extern void outsw (unsigned long port, const void *src, unsigned long count);
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extern void outsl (unsigned long port, const void *src, unsigned long count);
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/*
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* The Alpha Jensen hardware for some rather strange reason puts
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* the RTC clock at 0x170 instead of 0x70. Probably due to some
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* misguided idea about using 0x70 for NMI stuff.
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*
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* These defines will override the defaults when doing RTC queries
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*/
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#ifdef CONFIG_ALPHA_GENERIC
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# define RTC_PORT(x) ((x) + alpha_mv.rtc_port)
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#else
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# ifdef CONFIG_ALPHA_JENSEN
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# define RTC_PORT(x) (0x170+(x))
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# else
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# define RTC_PORT(x) (0x70 + (x))
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# endif
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#endif
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#define RTC_ALWAYS_BCD 0
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/* Nothing to do */
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#define dma_cache_inv(_start,_size) do { } while (0)
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#define dma_cache_wback(_start,_size) do { } while (0)
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#define dma_cache_wback_inv(_start,_size) do { } while (0)
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/*
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* Some mucking forons use if[n]def writeq to check if platform has it.
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* It's a bloody bad idea and we probably want ARCH_HAS_WRITEQ for them
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* to play with; for now just use cpp anti-recursion logics and make sure
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* that damn thing is defined and expands to itself.
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*/
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#define writeq writeq
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#define readq readq
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/*
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* Convert a physical pointer to a virtual kernel pointer for /dev/mem
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* access
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*/
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#define xlate_dev_mem_ptr(p) __va(p)
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/*
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* Convert a virtual cached pointer to an uncached pointer
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*/
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#define xlate_dev_kmem_ptr(p) p
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#endif /* __KERNEL__ */
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#endif /* __ALPHA_IO_H */
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