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Diffstat (limited to 'include/asm-arm/arch-ixp2000/io.h')
| -rw-r--r-- | include/asm-arm/arch-ixp2000/io.h | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/include/asm-arm/arch-ixp2000/io.h b/include/asm-arm/arch-ixp2000/io.h new file mode 100644 index 000000000000..a8e3c2daefd6 --- /dev/null +++ b/include/asm-arm/arch-ixp2000/io.h @@ -0,0 +1,150 @@ +/* + * linux/include/asm-arm/arch-ixp2000/io.h + * + * Original Author: Naeem M Afzal <naeem.m.afzal@intel.com> + * Maintainer: Deepak Saxena <dsaxena@plexity.net> + * + * Copyright (C) 2002 Intel Corp. + * Copyrgiht (C) 2003-2004 MontaVista Software, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __ASM_ARM_ARCH_IO_H +#define __ASM_ARM_ARCH_IO_H + +#define IO_SPACE_LIMIT 0xffffffff +#define __mem_pci(a) (a) +#define ___io(p) ((void __iomem *)((p)+IXP2000_PCI_IO_VIRT_BASE)) + +/* + * The IXP2400 before revision B0 asserts byte lanes for PCI I/O + * transactions the other way round (MEM transactions don't have this + * issue), so we need to override the standard functions. B0 and later + * have a bit that can be set to 1 to get the 'proper' behavior, but + * since that isn't available on the A? revisions we just keep doing + * things manually. + */ +#define alignb(addr) (void __iomem *)((unsigned long)addr ^ 3) +#define alignw(addr) (void __iomem *)((unsigned long)addr ^ 2) + +#define outb(v,p) __raw_writeb((v),alignb(___io(p))) +#define outw(v,p) __raw_writew((v),alignw(___io(p))) +#define outl(v,p) __raw_writel((v),___io(p)) + +#define inb(p) ({ unsigned int __v = __raw_readb(alignb(___io(p))); __v; }) +#define inw(p) \ + ({ unsigned int __v = (__raw_readw(alignw(___io(p)))); __v; }) +#define inl(p) \ + ({ unsigned int __v = (__raw_readl(___io(p))); __v; }) + +#define outsb(p,d,l) __raw_writesb(alignb(___io(p)),d,l) +#define outsw(p,d,l) __raw_writesw(alignw(___io(p)),d,l) +#define outsl(p,d,l) __raw_writesl(___io(p),d,l) + +#define insb(p,d,l) __raw_readsb(alignb(___io(p)),d,l) +#define insw(p,d,l) __raw_readsw(alignw(___io(p)),d,l) +#define insl(p,d,l) __raw_readsl(___io(p),d,l) + + +#ifdef CONFIG_ARCH_IXDP2X01 +/* + * This is an ugly hack but the CS8900 on the 2x01's does not sit in any sort + * of "I/O space" and is just direct mapped into a 32-bit-only addressable + * bus. The address space for this bus is such that we can't really easily + * make it contiguous to the PCI I/O address range, and it also does not + * need swapping like PCI addresses do (IXDP2x01 is a BE platform). + * B/C of this we can't use the standard in/out functions and need to + * runtime check if the incoming address is a PCI address or for + * the CS89x0. + */ +#undef inw +#undef outw +#undef insw +#undef outsw + +#include <asm/mach-types.h> + +static inline void insw(u32 ptr, void *buf, int length) +{ + register volatile u32 *port = (volatile u32 *)ptr; + + /* + * Is this cycle meant for the CS8900? + */ + if ((machine_is_ixdp2401() || machine_is_ixdp2801()) && + ((port >= IXDP2X01_CS8900_VIRT_BASE) && + (port <= IXDP2X01_CS8900_VIRT_END))) { + u8 *buf8 = (u8*)buf; + register u32 tmp32; + + do { + tmp32 = *port; + *buf8++ = (u8)tmp32; + *buf8++ = (u8)(tmp32 >> 8); + } while(--length); + + return; + } + + __raw_readsw(alignw(___io(ptr)),buf,length); +} + +static inline void outsw(u32 ptr, void *buf, int length) +{ + register volatile u32 *port = (volatile u32 *)ptr; + + /* + * Is this cycle meant for the CS8900? + */ + if ((machine_is_ixdp2401() || machine_is_ixdp2801()) && + ((port >= IXDP2X01_CS8900_VIRT_BASE) && + (port <= IXDP2X01_CS8900_VIRT_END))) { + register u32 tmp32; + u8 *buf8 = (u8*)buf; + do { + tmp32 = *buf8++; + tmp32 |= (*buf8++) << 8; + *port = tmp32; + } while(--length); + return; + } + + __raw_writesw(alignw(___io(ptr)),buf,length); +} + + +static inline u16 inw(u32 ptr) +{ + register volatile u32 *port = (volatile u32 *)ptr; + + /* + * Is this cycle meant for the CS8900? + */ + if ((machine_is_ixdp2401() || machine_is_ixdp2801()) && + ((port >= IXDP2X01_CS8900_VIRT_BASE) && + (port <= IXDP2X01_CS8900_VIRT_END))) { + return (u16)(*port); + } + + return __raw_readw(alignw(___io(ptr))); +} + +static inline void outw(u16 value, u32 ptr) +{ + register volatile u32 *port = (volatile u32 *)ptr; + + if ((machine_is_ixdp2401() || machine_is_ixdp2801()) && + ((port >= IXDP2X01_CS8900_VIRT_BASE) && + (port <= IXDP2X01_CS8900_VIRT_END))) { + *port = value; + return; + } + + __raw_writew((value),alignw(___io(ptr))); +} +#endif /* IXDP2x01 */ + +#endif |