arch/sh/kernel/io_generic.c

   1 /* $Id: io_generic.c,v 1.2 2003/05/04 19:29:53 lethal Exp $
   2  *
   3  * linux/arch/sh/kernel/io_generic.c
   4  *
   5  * Copyright (C) 2000  Niibe Yutaka
   6  *
   7  * Generic I/O routine. These can be used where a machine specific version
   8  * is not required.
   9  *
  10  * This file is subject to the terms and conditions of the GNU General Public
  11  * License.  See the file "COPYING" in the main directory of this archive
  12  * for more details.
  13  *
  14  */
  15
  16 #include <asm/io.h>
  17 #include <asm/machvec.h>
  18 #include <linux/module.h>
  19
  20 #if defined(CONFIG_CPU_SH3)
  21 /* I'm not sure SH7709 has this kind of bug */
  22 #define SH3_PCMCIA_BUG_WORKAROUND 1
  23 #define DUMMY_READ_AREA6          0xba000000
  24 #endif
  25
  26 #define PORT2ADDR(x) (sh_mv.mv_isa_port2addr(x))
  27
  28 unsigned long generic_io_base;
  29
  30 static inline void delay(void)
  31 {
  32         ctrl_inw(0xa0000000);
  33 }
  34
  35 unsigned char generic_inb(unsigned long port)
  36 {
  37         return *(volatile unsigned char*)PORT2ADDR(port);
  38 }
  39
  40 unsigned short generic_inw(unsigned long port)
  41 {
  42         return *(volatile unsigned short*)PORT2ADDR(port);
  43 }
  44
  45 unsigned int generic_inl(unsigned long port)
  46 {
  47         return *(volatile unsigned long*)PORT2ADDR(port);
  48 }
  49
  50 unsigned char generic_inb_p(unsigned long port)
  51 {
  52         unsigned long v = *(volatile unsigned char*)PORT2ADDR(port);
  53
  54         delay();
  55         return v;
  56 }
  57
  58 unsigned short generic_inw_p(unsigned long port)
  59 {
  60         unsigned long v = *(volatile unsigned short*)PORT2ADDR(port);
  61
  62         delay();
  63         return v;
  64 }
  65
  66 unsigned int generic_inl_p(unsigned long port)
  67 {
  68         unsigned long v = *(volatile unsigned long*)PORT2ADDR(port);
  69
  70         delay();
  71         return v;
  72 }
  73
  74 /*
  75  * insb/w/l all read a series of bytes/words/longs from a fixed port
  76  * address. However as the port address doesn't change we only need to
  77  * convert the port address to real address once.
  78  */
  79
  80 void generic_insb(unsigned long port, void *buffer, unsigned long count)
  81 {
  82         volatile unsigned char *port_addr;
  83         unsigned char *buf=buffer;
  84
  85         port_addr = (volatile unsigned char *)PORT2ADDR(port);
  86
  87         while(count--)
  88             *buf++ = *port_addr;
  89 }
  90
  91 void generic_insw(unsigned long port, void *buffer, unsigned long count)
  92 {
  93         volatile unsigned short *port_addr;
  94         unsigned short *buf=buffer;
  95
  96         port_addr = (volatile unsigned short *)PORT2ADDR(port);
  97
  98         while(count--)
  99             *buf++ = *port_addr;
 100 #ifdef SH3_PCMCIA_BUG_WORKAROUND
 101         ctrl_inb (DUMMY_READ_AREA6);
 102 #endif
 103 }
 104
 105 void generic_insl(unsigned long port, void *buffer, unsigned long count)
 106 {
 107         volatile unsigned long *port_addr;
 108         unsigned long *buf=buffer;
 109
 110         port_addr = (volatile unsigned long *)PORT2ADDR(port);
 111
 112         while(count--)
 113             *buf++ = *port_addr;
 114 #ifdef SH3_PCMCIA_BUG_WORKAROUND
 115         ctrl_inb (DUMMY_READ_AREA6);
 116 #endif
 117 }
 118
 119 void generic_outb(unsigned char b, unsigned long port)
 120 {
 121         *(volatile unsigned char*)PORT2ADDR(port) = b;
 122 }
 123
 124 void generic_outw(unsigned short b, unsigned long port)
 125 {
 126         *(volatile unsigned short*)PORT2ADDR(port) = b;
 127 }
 128
 129 void generic_outl(unsigned int b, unsigned long port)
 130 {
 131         *(volatile unsigned long*)PORT2ADDR(port) = b;
 132 }
 133
 134 void generic_outb_p(unsigned char b, unsigned long port)
 135 {
 136         *(volatile unsigned char*)PORT2ADDR(port) = b;
 137         delay();
 138 }
 139
 140 void generic_outw_p(unsigned short b, unsigned long port)
 141 {
 142         *(volatile unsigned short*)PORT2ADDR(port) = b;
 143         delay();
 144 }
 145
 146 void generic_outl_p(unsigned int b, unsigned long port)
 147 {
 148         *(volatile unsigned long*)PORT2ADDR(port) = b;
 149         delay();
 150 }
 151
 152 /*
 153  * outsb/w/l all write a series of bytes/words/longs to a fixed port
 154  * address. However as the port address doesn't change we only need to
 155  * convert the port address to real address once.
 156  */
 157
 158 void generic_outsb(unsigned long port, const void *buffer, unsigned long count)
 159 {
 160         volatile unsigned char *port_addr;
 161         const unsigned char *buf=buffer;
 162
 163         port_addr = (volatile unsigned char *)PORT2ADDR(port);
 164
 165         while(count--)
 166             *port_addr = *buf++;
 167 }
 168
 169 void generic_outsw(unsigned long port, const void *buffer, unsigned long count)
 170 {
 171         volatile unsigned short *port_addr;
 172         const unsigned short *buf=buffer;
 173
 174         port_addr = (volatile unsigned short *)PORT2ADDR(port);
 175
 176         while(count--)
 177             *port_addr = *buf++;
 178
 179 #ifdef SH3_PCMCIA_BUG_WORKAROUND
 180         ctrl_inb (DUMMY_READ_AREA6);
 181 #endif
 182 }
 183
 184 void generic_outsl(unsigned long port, const void *buffer, unsigned long count)
 185 {
 186         volatile unsigned long *port_addr;
 187         const unsigned long *buf=buffer;
 188
 189         port_addr = (volatile unsigned long *)PORT2ADDR(port);
 190
 191         while(count--)
 192             *port_addr = *buf++;
 193
 194 #ifdef SH3_PCMCIA_BUG_WORKAROUND
 195         ctrl_inb (DUMMY_READ_AREA6);
 196 #endif
 197 }
 198
 199 unsigned char generic_readb(unsigned long addr)
 200 {
 201         return *(volatile unsigned char*)addr;
 202 }
 203
 204 unsigned short generic_readw(unsigned long addr)
 205 {
 206         return *(volatile unsigned short*)addr;
 207 }
 208
 209 unsigned int generic_readl(unsigned long addr)
 210 {
 211         return *(volatile unsigned long*)addr;
 212 }
 213
 214 void generic_writeb(unsigned char b, unsigned long addr)
 215 {
 216         *(volatile unsigned char*)addr = b;
 217 }
 218
 219 void generic_writew(unsigned short b, unsigned long addr)
 220 {
 221         *(volatile unsigned short*)addr = b;
 222 }
 223
 224 void generic_writel(unsigned int b, unsigned long addr)
 225 {
 226         *(volatile unsigned long*)addr = b;
 227 }
 228
 229 void * generic_ioremap(unsigned long offset, unsigned long size)
 230 {
 231         return (void *) P2SEGADDR(offset);
 232 }
 233 EXPORT_SYMBOL(generic_ioremap);
 234
 235 void generic_iounmap(void *addr)
 236 {
 237 }
 238 EXPORT_SYMBOL(generic_iounmap);
 239
 240 unsigned long generic_isa_port2addr(unsigned long offset)
 241 {
 242         return offset + generic_io_base;
 243 }