include/asm-arm/arch-ixp2000/io.h

   1 /*
   2  * linux/include/asm-arm/arch-ixp2000/io.h
   3  *
   4  * Original Author: Naeem M Afzal <naeem.m.afzal@intel.com>
   5  * Maintainer: Deepak Saxena <dsaxena@plexity.net>
   6  *
   7  * Copyright (C) 2002  Intel Corp.
   8  * Copyrgiht (C) 2003-2004 MontaVista Software, Inc.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #ifndef __ASM_ARM_ARCH_IO_H
  16 #define __ASM_ARM_ARCH_IO_H
  17
  18 #define IO_SPACE_LIMIT          0xffffffff
  19 #define __mem_pci(a)            (a)
  20 #define ___io(p)                ((void __iomem *)((p)+IXP2000_PCI_IO_VIRT_BASE))
  21
  22 /*
  23  * The IXP2400 before revision B0 asserts byte lanes for PCI I/O
  24  * transactions the other way round (MEM transactions don't have this
  25  * issue), so we need to override the standard functions.  B0 and later
  26  * have a bit that can be set to 1 to get the 'proper' behavior, but
  27  * since that isn't available on the A? revisions we just keep doing
  28  * things manually.
  29  */
  30 #define alignb(addr)            (void __iomem *)((unsigned long)addr ^ 3)
  31 #define alignw(addr)            (void __iomem *)((unsigned long)addr ^ 2)
  32
  33 #define outb(v,p)               __raw_writeb((v),alignb(___io(p)))
  34 #define outw(v,p)               __raw_writew((v),alignw(___io(p)))
  35 #define outl(v,p)               __raw_writel((v),___io(p))
  36
  37 #define inb(p)          ({ unsigned int __v = __raw_readb(alignb(___io(p))); __v; })
  38 #define inw(p)          \
  39         ({ unsigned int __v = (__raw_readw(alignw(___io(p)))); __v; })
  40 #define inl(p)          \
  41         ({ unsigned int __v = (__raw_readl(___io(p))); __v; })
  42
  43 #define outsb(p,d,l)            __raw_writesb(alignb(___io(p)),d,l)
  44 #define outsw(p,d,l)            __raw_writesw(alignw(___io(p)),d,l)
  45 #define outsl(p,d,l)            __raw_writesl(___io(p),d,l)
  46
  47 #define insb(p,d,l)             __raw_readsb(alignb(___io(p)),d,l)
  48 #define insw(p,d,l)             __raw_readsw(alignw(___io(p)),d,l)
  49 #define insl(p,d,l)             __raw_readsl(___io(p),d,l)
  50
  51
  52 #ifdef CONFIG_ARCH_IXDP2X01
  53 /*
  54  * This is an ugly hack but the CS8900 on the 2x01's does not sit in any sort
  55  * of "I/O space" and is just direct mapped into a 32-bit-only addressable
  56  * bus. The address space for this bus is such that we can't really easily
  57  * make it contiguous to the PCI I/O address range, and it also does not
  58  * need swapping like PCI addresses do (IXDP2x01 is a BE platform).
  59  * B/C of this we can't use the standard in/out functions and need to
  60  * runtime check if the incoming address is a PCI address or for
  61  * the CS89x0.
  62  */
  63 #undef inw
  64 #undef outw
  65 #undef insw
  66 #undef outsw
  67
  68 #include <asm/mach-types.h>
  69
  70 static inline void insw(u32 ptr, void *buf, int length)
  71 {
  72         register volatile u32 *port = (volatile u32 *)ptr;
  73
  74         /*
  75          * Is this cycle meant for the CS8900?
  76          */
  77         if ((machine_is_ixdp2401() || machine_is_ixdp2801()) &&
  78                 (((u32)port >= (u32)IXDP2X01_CS8900_VIRT_BASE) &&
  79                  ((u32)port <= (u32)IXDP2X01_CS8900_VIRT_END))) {
  80                 u8 *buf8 = (u8*)buf;
  81                 register u32 tmp32;
  82
  83                 do {
  84                         tmp32 = *port;
  85                         *buf8++ = (u8)tmp32;
  86                         *buf8++ = (u8)(tmp32 >> 8);
  87                 } while(--length);
  88
  89                 return;
  90         }
  91
  92         __raw_readsw(alignw(___io(ptr)),buf,length);
  93 }
  94
  95 static inline void outsw(u32 ptr, void *buf, int length)
  96 {
  97         register volatile u32 *port = (volatile u32 *)ptr;
  98
  99         /*
 100          * Is this cycle meant for the CS8900?
 101          */
 102         if ((machine_is_ixdp2401() || machine_is_ixdp2801()) &&
 103                 (((u32)port >= (u32)IXDP2X01_CS8900_VIRT_BASE) &&
 104                  ((u32)port <= (u32)IXDP2X01_CS8900_VIRT_END))) {
 105                 register u32 tmp32;
 106                 u8 *buf8 = (u8*)buf;
 107                 do {
 108                         tmp32 = *buf8++;
 109                         tmp32 |= (*buf8++) << 8;
 110                         *port = tmp32;
 111                 } while(--length);
 112                 return;
 113         }
 114
 115         __raw_writesw(alignw(___io(ptr)),buf,length);
 116 }
 117
 118
 119 static inline u16 inw(u32 ptr)
 120 {
 121         register volatile u32 *port = (volatile u32 *)ptr;
 122
 123         /*
 124          * Is this cycle meant for the CS8900?
 125          */
 126         if ((machine_is_ixdp2401() || machine_is_ixdp2801()) &&
 127                 (((u32)port >= (u32)IXDP2X01_CS8900_VIRT_BASE) &&
 128                  ((u32)port <= (u32)IXDP2X01_CS8900_VIRT_END))) {
 129                 return (u16)(*port);
 130         }
 131
 132         return __raw_readw(alignw(___io(ptr)));
 133 }
 134
 135 static inline void outw(u16 value, u32 ptr)
 136 {
 137         register volatile u32 *port = (volatile u32 *)ptr;
 138
 139         if ((machine_is_ixdp2401() || machine_is_ixdp2801()) &&
 140                 (((u32)port >= (u32)IXDP2X01_CS8900_VIRT_BASE) &&
 141                  ((u32)port <= (u32)IXDP2X01_CS8900_VIRT_END))) {
 142                 *port = value;
 143                 return;
 144         }
 145
 146         __raw_writew((value),alignw(___io(ptr)));
 147 }
 148 #endif  /* IXDP2x01 */
 149
 150 #endif