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

   1 /*
   2  * linux/include/asm-arm/arch-rpc/io.h
   3  *
   4  * Copyright (C) 1997 Russell King
   5  *
   6  * Modifications:
   7  *  06-Dec-1997 RMK     Created.
   8  */
   9 #ifndef __ASM_ARM_ARCH_IO_H
  10 #define __ASM_ARM_ARCH_IO_H
  11
  12 /*
  13  * This architecture does not require any delayed IO, and
  14  * has the constant-optimised IO
  15  */
  16 #undef  ARCH_IO_DELAY
  17
  18 /*
  19  * We use two different types of addressing - PC style addresses, and ARM
  20  * addresses.  PC style accesses the PC hardware with the normal PC IO
  21  * addresses, eg 0x3f8 for serial#1.  ARM addresses are 0x80000000+
  22  * and are translated to the start of IO.  Note that all addresses are
  23  * shifted left!
  24  */
  25 #define __PORT_PCIO(x)  (!((x) & 0x80000000))
  26
  27 /*
  28  * Dynamic IO functions - let the compiler
  29  * optimize the expressions
  30  */
  31 #define DECLARE_DYN_OUT(fnsuffix,instr)                                         \
  32 extern __inline__ void __out##fnsuffix (unsigned int value, unsigned int port)  \
  33 {                                                                               \
  34         unsigned long temp;                                                     \
  35         __asm__ __volatile__(                                                   \
  36         "tst    %2, #0x80000000\n\t"                                            \
  37         "mov    %0, %4\n\t"                                                     \
  38         "addeq  %0, %0, %3\n\t"                                                 \
  39         "str" ##instr## "       %1, [%0, %2, lsl #2]    @ out"###fnsuffix       \
  40         : "=&r" (temp)                                                          \
  41         : "r" (value), "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)   \
  42         : "cc");                                                                \
  43 }
  44
  45 #define DECLARE_DYN_IN(sz,fnsuffix,instr)                                       \
  46 extern __inline__ unsigned sz __in##fnsuffix (unsigned int port)                \
  47 {                                                                               \
  48         unsigned long temp, value;                                              \
  49         __asm__ __volatile__(                                                   \
  50         "tst    %2, #0x80000000\n\t"                                            \
  51         "mov    %0, %4\n\t"                                                     \
  52         "addeq  %0, %0, %3\n\t"                                                 \
  53         "ldr" ##instr## "       %1, [%0, %2, lsl #2]    @ in"###fnsuffix        \
  54         : "=&r" (temp), "=r" (value)                                            \
  55         : "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)                \
  56         : "cc");                                                                \
  57         return (unsigned sz)value;                                              \
  58 }
  59
  60 extern __inline__ unsigned int __ioaddr (unsigned int port)                     \
  61 {                                                                               \
  62         if (__PORT_PCIO(port))                                                  \
  63                 return (unsigned int)(PCIO_BASE + (port << 2));                 \
  64         else                                                                    \
  65                 return (unsigned int)(IO_BASE + (port << 2));                   \
  66 }
  67
  68 #define DECLARE_IO(sz,fnsuffix,instr)   \
  69         DECLARE_DYN_OUT(fnsuffix,instr) \
  70         DECLARE_DYN_IN(sz,fnsuffix,instr)
  71
  72 DECLARE_IO(char,b,"b")
  73 DECLARE_IO(short,w,"")
  74 DECLARE_IO(long,l,"")
  75
  76 #undef DECLARE_IO
  77 #undef DECLARE_DYN_OUT
  78 #undef DECLARE_DYN_IN
  79
  80 /*
  81  * Constant address IO functions
  82  *
  83  * These have to be macros for the 'J' constraint to work -
  84  * +/-4096 immediate operand.
  85  */
  86 #define __outbc(value,port)                                                     \
  87 ({                                                                              \
  88         if (__PORT_PCIO((port)))                                                \
  89                 __asm__ __volatile__(                                           \
  90                 "strb   %0, [%1, %2]    @ outbc"                                \
  91                 : : "r" (value), "r" (PCIO_BASE), "Jr" ((port) << 2));          \
  92         else                                                                    \
  93                 __asm__ __volatile__(                                           \
  94                 "strb   %0, [%1, %2]    @ outbc"                                \
  95                 : : "r" (value), "r" (IO_BASE), "r" ((port) << 2));             \
  96 })
  97
  98 #define __inbc(port)                                                            \
  99 ({                                                                              \
 100         unsigned char result;                                                   \
 101         if (__PORT_PCIO((port)))                                                \
 102                 __asm__ __volatile__(                                           \
 103                 "ldrb   %0, [%1, %2]    @ inbc"                                 \
 104                 : "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2));         \
 105         else                                                                    \
 106                 __asm__ __volatile__(                                           \
 107                 "ldrb   %0, [%1, %2]    @ inbc"                                 \
 108                 : "=r" (result) : "r" (IO_BASE), "r" ((port) << 2));            \
 109         result;                                                                 \
 110 })
 111
 112 #define __outwc(value,port)                                                     \
 113 ({                                                                              \
 114         unsigned long v = value;                                                \
 115         if (__PORT_PCIO((port)))                                                \
 116                 __asm__ __volatile__(                                           \
 117                 "str    %0, [%1, %2]    @ outwc"                                \
 118                 : : "r" (v|v<<16), "r" (PCIO_BASE), "Jr" ((port) << 2));        \
 119         else                                                                    \
 120                 __asm__ __volatile__(                                           \
 121                 "str    %0, [%1, %2]    @ outwc"                                \
 122                 : : "r" (v|v<<16), "r" (IO_BASE), "r" ((port) << 2));           \
 123 })
 124
 125 #define __inwc(port)                                                            \
 126 ({                                                                              \
 127         unsigned short result;                                                  \
 128         if (__PORT_PCIO((port)))                                                \
 129                 __asm__ __volatile__(                                           \
 130                 "ldr    %0, [%1, %2]    @ inwc"                                 \
 131                 : "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2));         \
 132         else                                                                    \
 133                 __asm__ __volatile__(                                           \
 134                 "ldr    %0, [%1, %2]    @ inwc"                                 \
 135                 : "=r" (result) : "r" (IO_BASE), "r" ((port) << 2));            \
 136         result & 0xffff;                                                        \
 137 })
 138
 139 #define __outlc(value,port)                                                     \
 140 ({                                                                              \
 141         unsigned long v = value;                                                \
 142         if (__PORT_PCIO((port)))                                                \
 143                 __asm__ __volatile__(                                           \
 144                 "str    %0, [%1, %2]    @ outlc"                                \
 145                 : : "r" (v), "r" (PCIO_BASE), "Jr" ((port) << 2));              \
 146         else                                                                    \
 147                 __asm__ __volatile__(                                           \
 148                 "str    %0, [%1, %2]    @ outlc"                                \
 149                 : : "r" (v), "r" (IO_BASE), "r" ((port) << 2));                 \
 150 })
 151
 152 #define __inlc(port)                                                            \
 153 ({                                                                              \
 154         unsigned long result;                                                   \
 155         if (__PORT_PCIO((port)))                                                \
 156                 __asm__ __volatile__(                                           \
 157                 "ldr    %0, [%1, %2]    @ inlc"                                 \
 158                 : "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2));         \
 159         else                                                                    \
 160                 __asm__ __volatile__(                                           \
 161                 "ldr    %0, [%1, %2]    @ inlc"                                 \
 162                 : "=r" (result) : "r" (IO_BASE), "r" ((port) << 2));            \
 163         result;                                                                 \
 164 })
 165
 166 #define __ioaddrc(port)                                                         \
 167         (__PORT_PCIO((port)) ? PCIO_BASE + ((port) << 2) : IO_BASE + ((port) << 2))
 168
 169 /*
 170  * Translated address IO functions
 171  *
 172  * IO address has already been translated to a virtual address
 173  */
 174 #define outb_t(v,p)                                                             \
 175         (*(volatile unsigned char *)(p) = (v))
 176
 177 #define inb_t(p)                                                                \
 178         (*(volatile unsigned char *)(p))
 179
 180 #define outl_t(v,p)                                                             \
 181         (*(volatile unsigned long *)(p) = (v))
 182
 183 #define inl_t(p)                                                                \
 184         (*(volatile unsigned long *)(p))
 185
 186 #endif