arch/arm/mach-ebsa110/io.c

   1 /*
   2  *  linux/arch/arm/mach-ebsa110/isamem.c
   3  *
   4  *  Copyright (C) 2001 Russell King
   5  *
   6  * Perform "ISA" memory and IO accesses.  The EBSA110 has some "peculiarities"
   7  * in the way it handles accesses to odd IO ports on 16-bit devices.  These
   8  * devices have their D0-D15 lines connected to the processors D0-D15 lines.
   9  * Since they expect all byte IO operations to be performed on D0-D7, and the
  10  * StrongARM expects to transfer the byte to these odd addresses on D8-D15,
  11  * we must use a trick to get the required behaviour.
  12  *
  13  * The trick employed here is to use long word stores to odd address -1.  The
  14  * glue logic picks this up as a "trick" access, and asserts the LSB of the
  15  * peripherals address bus, thereby accessing the odd IO port.  Meanwhile, the
  16  * StrongARM transfers its data on D0-D7 as expected.
  17  *
  18  * Things get more interesting on the pass-1 EBSA110 - the PCMCIA controller
  19  * wiring was screwed in such a way that it had limited memory space access.
  20  * Luckily, the work-around for this is not too horrible.  See
  21  * __isamem_convert_addr for the details.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/kernel.h>
  25 #include <linux/types.h>
  26
  27 #include <asm/hardware.h>
  28 #include <asm/io.h>
  29 #include <asm/page.h>
  30
  31 static void __iomem *__isamem_convert_addr(void __iomem *addr)
  32 {
  33         u32 ret, a = (u32 __force) addr;
  34
  35         /*
  36          * The PCMCIA controller is wired up as follows:
  37          *        +---------+---------+---------+---------+---------+---------+
  38          * PCMCIA | 2 2 2 2 | 1 1 1 1 | 1 1 1 1 | 1 1     |         |         |
  39          *        | 3 2 1 0 | 9 8 7 6 | 5 4 3 2 | 1 0 9 8 | 7 6 5 4 | 3 2 1 0 |
  40          *        +---------+---------+---------+---------+---------+---------+
  41          *  CPU   | 2 2 2 2 | 2 1 1 1 | 1 1 1 1 | 1 1 1   |         |         |
  42          *        | 4 3 2 1 | 0 9 9 8 | 7 6 5 4 | 3 2 0 9 | 8 7 6 5 | 4 3 2 x |
  43          *        +---------+---------+---------+---------+---------+---------+
  44          *
  45          * This means that we can access PCMCIA regions as follows:
  46          *      0x*10000 -> 0x*1ffff
  47          *      0x*70000 -> 0x*7ffff
  48          *      0x*90000 -> 0x*9ffff
  49          *      0x*f0000 -> 0x*fffff
  50          */
  51         ret  = (a & 0xf803fe) << 1;
  52         ret |= (a & 0x03fc00) << 2;
  53
  54         ret += 0xe8000000;
  55
  56         if ((a & 0x20000) == (a & 0x40000) >> 1)
  57                 return (void __iomem *)ret;
  58
  59         BUG();
  60         return NULL;
  61 }
  62
  63 /*
  64  * read[bwl] and write[bwl]
  65  */
  66 u8 __readb(void __iomem *addr)
  67 {
  68         void __iomem *a = __isamem_convert_addr(addr);
  69         u32 ret;
  70
  71         if ((unsigned long)addr & 1)
  72                 ret = __raw_readl(a);
  73         else
  74                 ret = __raw_readb(a);
  75         return ret;
  76 }
  77
  78 u16 __readw(void __iomem *addr)
  79 {
  80         void __iomem *a = __isamem_convert_addr(addr);
  81
  82         if ((unsigned long)addr & 1)
  83                 BUG();
  84
  85         return __raw_readw(a);
  86 }
  87
  88 u32 __readl(void __iomem *addr)
  89 {
  90         void __iomem *a = __isamem_convert_addr(addr);
  91         u32 ret;
  92
  93         if ((unsigned long)addr & 3)
  94                 BUG();
  95
  96         ret = __raw_readw(a);
  97         ret |= __raw_readw(a + 4) << 16;
  98         return ret;
  99 }
 100
 101 EXPORT_SYMBOL(__readb);
 102 EXPORT_SYMBOL(__readw);
 103 EXPORT_SYMBOL(__readl);
 104
 105 void __writeb(u8 val, void __iomem *addr)
 106 {
 107         void __iomem *a = __isamem_convert_addr(addr);
 108
 109         if ((unsigned long)addr & 1)
 110                 __raw_writel(val, a);
 111         else
 112                 __raw_writeb(val, a);
 113 }
 114
 115 void __writew(u16 val, void __iomem *addr)
 116 {
 117         void __iomem *a = __isamem_convert_addr(addr);
 118
 119         if ((unsigned long)addr & 1)
 120                 BUG();
 121
 122         __raw_writew(val, a);
 123 }
 124
 125 void __writel(u32 val, void __iomem *addr)
 126 {
 127         void __iomem *a = __isamem_convert_addr(addr);
 128
 129         if ((unsigned long)addr & 3)
 130                 BUG();
 131
 132         __raw_writew(val, a);
 133         __raw_writew(val >> 16, a + 4);
 134 }
 135
 136 EXPORT_SYMBOL(__writeb);
 137 EXPORT_SYMBOL(__writew);
 138 EXPORT_SYMBOL(__writel);
 139
 140 #define SUPERIO_PORT(p) \
 141         (((p) >> 3) == (0x3f8 >> 3) || \
 142          ((p) >> 3) == (0x2f8 >> 3) || \
 143          ((p) >> 3) == (0x378 >> 3))
 144
 145 /*
 146  * We're addressing an 8 or 16-bit peripheral which tranfers
 147  * odd addresses on the low ISA byte lane.
 148  */
 149 u8 __inb8(unsigned int port)
 150 {
 151         u32 ret;
 152
 153         /*
 154          * The SuperIO registers use sane addressing techniques...
 155          */
 156         if (SUPERIO_PORT(port))
 157                 ret = __raw_readb((void __iomem *)ISAIO_BASE + (port << 2));
 158         else {
 159                 void __iomem *a = (void __iomem *)ISAIO_BASE + ((port & ~1) << 1);
 160
 161                 /*
 162                  * Shame nothing else does
 163                  */
 164                 if (port & 1)
 165                         ret = __raw_readl(a);
 166                 else
 167                         ret = __raw_readb(a);
 168         }
 169         return ret;
 170 }
 171
 172 /*
 173  * We're addressing a 16-bit peripheral which transfers odd
 174  * addresses on the high ISA byte lane.
 175  */
 176 u8 __inb16(unsigned int port)
 177 {
 178         unsigned int offset;
 179
 180         /*
 181          * The SuperIO registers use sane addressing techniques...
 182          */
 183         if (SUPERIO_PORT(port))
 184                 offset = port << 2;
 185         else
 186                 offset = (port & ~1) << 1 | (port & 1);
 187
 188         return __raw_readb((void __iomem *)ISAIO_BASE + offset);
 189 }
 190
 191 u16 __inw(unsigned int port)
 192 {
 193         unsigned int offset;
 194
 195         /*
 196          * The SuperIO registers use sane addressing techniques...
 197          */
 198         if (SUPERIO_PORT(port))
 199                 offset = port << 2;
 200         else {
 201                 offset = port << 1;
 202                 BUG_ON(port & 1);
 203         }
 204         return __raw_readw((void __iomem *)ISAIO_BASE + offset);
 205 }
 206
 207 /*
 208  * Fake a 32-bit read with two 16-bit reads.  Needed for 3c589.
 209  */
 210 u32 __inl(unsigned int port)
 211 {
 212         void __iomem *a;
 213
 214         if (SUPERIO_PORT(port) || port & 3)
 215                 BUG();
 216
 217         a = (void __iomem *)ISAIO_BASE + ((port & ~1) << 1);
 218
 219         return __raw_readw(a) | __raw_readw(a + 4) << 16;
 220 }
 221
 222 EXPORT_SYMBOL(__inb8);
 223 EXPORT_SYMBOL(__inb16);
 224 EXPORT_SYMBOL(__inw);
 225 EXPORT_SYMBOL(__inl);
 226
 227 void __outb8(u8 val, unsigned int port)
 228 {
 229         /*
 230          * The SuperIO registers use sane addressing techniques...
 231          */
 232         if (SUPERIO_PORT(port))
 233                 __raw_writeb(val, (void __iomem *)ISAIO_BASE + (port << 2));
 234         else {
 235                 void __iomem *a = (void __iomem *)ISAIO_BASE + ((port & ~1) << 1);
 236
 237                 /*
 238                  * Shame nothing else does
 239                  */
 240                 if (port & 1)
 241                         __raw_writel(val, a);
 242                 else
 243                         __raw_writeb(val, a);
 244         }
 245 }
 246
 247 void __outb16(u8 val, unsigned int port)
 248 {
 249         unsigned int offset;
 250
 251         /*
 252          * The SuperIO registers use sane addressing techniques...
 253          */
 254         if (SUPERIO_PORT(port))
 255                 offset = port << 2;
 256         else
 257                 offset = (port & ~1) << 1 | (port & 1);
 258
 259         __raw_writeb(val, (void __iomem *)ISAIO_BASE + offset);
 260 }
 261
 262 void __outw(u16 val, unsigned int port)
 263 {
 264         unsigned int offset;
 265
 266         /*
 267          * The SuperIO registers use sane addressing techniques...
 268          */
 269         if (SUPERIO_PORT(port))
 270                 offset = port << 2;
 271         else {
 272                 offset = port << 1;
 273                 BUG_ON(port & 1);
 274         }
 275         __raw_writew(val, (void __iomem *)ISAIO_BASE + offset);
 276 }
 277
 278 void __outl(u32 val, unsigned int port)
 279 {
 280         BUG();
 281 }
 282
 283 EXPORT_SYMBOL(__outb8);
 284 EXPORT_SYMBOL(__outb16);
 285 EXPORT_SYMBOL(__outw);
 286 EXPORT_SYMBOL(__outl);
 287
 288 void outsb(unsigned int port, const void *from, int len)
 289 {
 290         u32 off;
 291
 292         if (SUPERIO_PORT(port))
 293                 off = port << 2;
 294         else {
 295                 off = (port & ~1) << 1;
 296                 if (port & 1)
 297                         BUG();
 298         }
 299
 300         __raw_writesb((void __iomem *)ISAIO_BASE + off, from, len);
 301 }
 302
 303 void insb(unsigned int port, void *from, int len)
 304 {
 305         u32 off;
 306
 307         if (SUPERIO_PORT(port))
 308                 off = port << 2;
 309         else {
 310                 off = (port & ~1) << 1;
 311                 if (port & 1)
 312                         BUG();
 313         }
 314
 315         __raw_readsb((void __iomem *)ISAIO_BASE + off, from, len);
 316 }
 317
 318 EXPORT_SYMBOL(outsb);
 319 EXPORT_SYMBOL(insb);
 320
 321 void outsw(unsigned int port, const void *from, int len)
 322 {
 323         u32 off;
 324
 325         if (SUPERIO_PORT(port))
 326                 off = port << 2;
 327         else {
 328                 off = (port & ~1) << 1;
 329                 if (port & 1)
 330                         BUG();
 331         }
 332
 333         __raw_writesw((void __iomem *)ISAIO_BASE + off, from, len);
 334 }
 335
 336 void insw(unsigned int port, void *from, int len)
 337 {
 338         u32 off;
 339
 340         if (SUPERIO_PORT(port))
 341                 off = port << 2;
 342         else {
 343                 off = (port & ~1) << 1;
 344                 if (port & 1)
 345                         BUG();
 346         }
 347
 348         __raw_readsw((void __iomem *)ISAIO_BASE + off, from, len);
 349 }
 350
 351 EXPORT_SYMBOL(outsw);
 352 EXPORT_SYMBOL(insw);
 353
 354 /*
 355  * We implement these as 16-bit insw/outsw, mainly for
 356  * 3c589 cards.
 357  */
 358 void outsl(unsigned int port, const void *from, int len)
 359 {
 360         u32 off = port << 1;
 361
 362         if (SUPERIO_PORT(port) || port & 3)
 363                 BUG();
 364
 365         __raw_writesw((void __iomem *)ISAIO_BASE + off, from, len << 1);
 366 }
 367
 368 void insl(unsigned int port, void *from, int len)
 369 {
 370         u32 off = port << 1;
 371
 372         if (SUPERIO_PORT(port) || port & 3)
 373                 BUG();
 374
 375         __raw_readsw((void __iomem *)ISAIO_BASE + off, from, len << 1);
 376 }
 377
 378 EXPORT_SYMBOL(outsl);
 379 EXPORT_SYMBOL(insl);