arch/alpha/include/asm/jensen.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ALPHA_JENSEN_H
   3 #define __ALPHA_JENSEN_H
   4
   5 #include <asm/compiler.h>
   6
   7 /*
   8  * Defines for the AlphaPC EISA IO and memory address space.
   9  */
  10
  11 /*
  12  * NOTE! The memory operations do not set any memory barriers, as it's
  13  * not needed for cases like a frame buffer that is essentially memory-like.
  14  * You need to do them by hand if the operations depend on ordering.
  15  *
  16  * Similarly, the port IO operations do a "mb" only after a write operation:
  17  * if an mb is needed before (as in the case of doing memory mapped IO
  18  * first, and then a port IO operation to the same device), it needs to be
  19  * done by hand.
  20  *
  21  * After the above has bitten me 100 times, I'll give up and just do the
  22  * mb all the time, but right now I'm hoping this will work out.  Avoiding
  23  * mb's may potentially be a noticeable speed improvement, but I can't
  24  * honestly say I've tested it.
  25  *
  26  * Handling interrupts that need to do mb's to synchronize to non-interrupts
  27  * is another fun race area.  Don't do it (because if you do, I'll have to
  28  * do *everything* with interrupts disabled, ugh).
  29  */
  30
  31 /*
  32  * EISA Interrupt Acknowledge address
  33  */
  34 #define EISA_INTA               (IDENT_ADDR + 0x100000000UL)
  35
  36 /*
  37  * FEPROM addresses
  38  */
  39 #define EISA_FEPROM0            (IDENT_ADDR + 0x180000000UL)
  40 #define EISA_FEPROM1            (IDENT_ADDR + 0x1A0000000UL)
  41
  42 /*
  43  * VL82C106 base address
  44  */
  45 #define EISA_VL82C106           (IDENT_ADDR + 0x1C0000000UL)
  46
  47 /*
  48  * EISA "Host Address Extension" address (bits 25-31 of the EISA address)
  49  */
  50 #define EISA_HAE                (IDENT_ADDR + 0x1D0000000UL)
  51
  52 /*
  53  * "SYSCTL" register address
  54  */
  55 #define EISA_SYSCTL             (IDENT_ADDR + 0x1E0000000UL)
  56
  57 /*
  58  * "spare" register address
  59  */
  60 #define EISA_SPARE              (IDENT_ADDR + 0x1F0000000UL)
  61
  62 /*
  63  * EISA memory address offset
  64  */
  65 #define EISA_MEM                (IDENT_ADDR + 0x200000000UL)
  66
  67 /*
  68  * EISA IO address offset
  69  */
  70 #define EISA_IO                 (IDENT_ADDR + 0x300000000UL)
  71
  72
  73 #ifdef __KERNEL__
  74
  75 #ifndef __EXTERN_INLINE
  76 #define __EXTERN_INLINE extern inline
  77 #define __IO_EXTERN_INLINE
  78 #endif
  79
  80 /*
  81  * Handle the "host address register". This needs to be set
  82  * to the high 7 bits of the EISA address.  This is also needed
  83  * for EISA IO addresses, which are only 16 bits wide (the
  84  * hae needs to be set to 0).
  85  *
  86  * HAE isn't needed for the local IO operations, though.
  87  */
  88
  89 #define JENSEN_HAE_ADDRESS      EISA_HAE
  90 #define JENSEN_HAE_MASK         0x1ffffff
  91
  92 __EXTERN_INLINE void jensen_set_hae(unsigned long addr)
  93 {
  94         /* hae on the Jensen is bits 31:25 shifted right */
  95         addr >>= 25;
  96         if (addr != alpha_mv.hae_cache)
  97                 set_hae(addr);
  98 }
  99
 100 #define vuip    volatile unsigned int *
 101
 102 /*
 103  * IO functions
 104  *
 105  * The "local" functions are those that don't go out to the EISA bus,
 106  * but instead act on the VL82C106 chip directly.. This is mainly the
 107  * keyboard, RTC,  printer and first two serial lines..
 108  *
 109  * The local stuff makes for some complications, but it seems to be
 110  * gone in the PCI version. I hope I can get DEC suckered^H^H^H^H^H^H^H^H
 111  * convinced that I need one of the newer machines.
 112  */
 113
 114 static inline unsigned int jensen_local_inb(unsigned long addr)
 115 {
 116         return 0xff & *(vuip)((addr << 9) + EISA_VL82C106);
 117 }
 118
 119 static inline void jensen_local_outb(u8 b, unsigned long addr)
 120 {
 121         *(vuip)((addr << 9) + EISA_VL82C106) = b;
 122         mb();
 123 }
 124
 125 static inline unsigned int jensen_bus_inb(unsigned long addr)
 126 {
 127         long result;
 128
 129         jensen_set_hae(0);
 130         result = *(volatile int *)((addr << 7) + EISA_IO + 0x00);
 131         return __kernel_extbl(result, addr & 3);
 132 }
 133
 134 static inline void jensen_bus_outb(u8 b, unsigned long addr)
 135 {
 136         jensen_set_hae(0);
 137         *(vuip)((addr << 7) + EISA_IO + 0x00) = b * 0x01010101;
 138         mb();
 139 }
 140
 141 /*
 142  * It seems gcc is not very good at optimizing away logical
 143  * operations that result in operations across inline functions.
 144  * Which is why this is a macro.
 145  */
 146
 147 #define jensen_is_local(addr) ( \
 148 /* keyboard */  (addr == 0x60 || addr == 0x64) || \
 149 /* RTC */       (addr == 0x170 || addr == 0x171) || \
 150 /* mb COM2 */   (addr >= 0x2f8 && addr <= 0x2ff) || \
 151 /* mb LPT1 */   (addr >= 0x3bc && addr <= 0x3be) || \
 152 /* mb COM2 */   (addr >= 0x3f8 && addr <= 0x3ff))
 153
 154 __EXTERN_INLINE u8 jensen_inb(unsigned long addr)
 155 {
 156         if (jensen_is_local(addr))
 157                 return jensen_local_inb(addr);
 158         else
 159                 return jensen_bus_inb(addr);
 160 }
 161
 162 __EXTERN_INLINE void jensen_outb(u8 b, unsigned long addr)
 163 {
 164         if (jensen_is_local(addr))
 165                 jensen_local_outb(b, addr);
 166         else
 167                 jensen_bus_outb(b, addr);
 168 }
 169
 170 __EXTERN_INLINE u16 jensen_inw(unsigned long addr)
 171 {
 172         long result;
 173
 174         jensen_set_hae(0);
 175         result = *(volatile int *) ((addr << 7) + EISA_IO + 0x20);
 176         result >>= (addr & 3) * 8;
 177         return 0xffffUL & result;
 178 }
 179
 180 __EXTERN_INLINE u32 jensen_inl(unsigned long addr)
 181 {
 182         jensen_set_hae(0);
 183         return *(vuip) ((addr << 7) + EISA_IO + 0x60);
 184 }
 185
 186 __EXTERN_INLINE void jensen_outw(u16 b, unsigned long addr)
 187 {
 188         jensen_set_hae(0);
 189         *(vuip) ((addr << 7) + EISA_IO + 0x20) = b * 0x00010001;
 190         mb();
 191 }
 192
 193 __EXTERN_INLINE void jensen_outl(u32 b, unsigned long addr)
 194 {
 195         jensen_set_hae(0);
 196         *(vuip) ((addr << 7) + EISA_IO + 0x60) = b;
 197         mb();
 198 }
 199
 200 /*
 201  * Memory functions.
 202  */
 203
 204 __EXTERN_INLINE u8 jensen_readb(const volatile void __iomem *xaddr)
 205 {
 206         unsigned long addr = (unsigned long) xaddr;
 207         long result;
 208
 209         jensen_set_hae(addr);
 210         addr &= JENSEN_HAE_MASK;
 211         result = *(volatile int *) ((addr << 7) + EISA_MEM + 0x00);
 212         result >>= (addr & 3) * 8;
 213         return 0xffUL & result;
 214 }
 215
 216 __EXTERN_INLINE u16 jensen_readw(const volatile void __iomem *xaddr)
 217 {
 218         unsigned long addr = (unsigned long) xaddr;
 219         long result;
 220
 221         jensen_set_hae(addr);
 222         addr &= JENSEN_HAE_MASK;
 223         result = *(volatile int *) ((addr << 7) + EISA_MEM + 0x20);
 224         result >>= (addr & 3) * 8;
 225         return 0xffffUL & result;
 226 }
 227
 228 __EXTERN_INLINE u32 jensen_readl(const volatile void __iomem *xaddr)
 229 {
 230         unsigned long addr = (unsigned long) xaddr;
 231         jensen_set_hae(addr);
 232         addr &= JENSEN_HAE_MASK;
 233         return *(vuip) ((addr << 7) + EISA_MEM + 0x60);
 234 }
 235
 236 __EXTERN_INLINE u64 jensen_readq(const volatile void __iomem *xaddr)
 237 {
 238         unsigned long addr = (unsigned long) xaddr;
 239         unsigned long r0, r1;
 240
 241         jensen_set_hae(addr);
 242         addr &= JENSEN_HAE_MASK;
 243         addr = (addr << 7) + EISA_MEM + 0x60;
 244         r0 = *(vuip) (addr);
 245         r1 = *(vuip) (addr + (4 << 7));
 246         return r1 << 32 | r0;
 247 }
 248
 249 __EXTERN_INLINE void jensen_writeb(u8 b, volatile void __iomem *xaddr)
 250 {
 251         unsigned long addr = (unsigned long) xaddr;
 252         jensen_set_hae(addr);
 253         addr &= JENSEN_HAE_MASK;
 254         *(vuip) ((addr << 7) + EISA_MEM + 0x00) = b * 0x01010101;
 255 }
 256
 257 __EXTERN_INLINE void jensen_writew(u16 b, volatile void __iomem *xaddr)
 258 {
 259         unsigned long addr = (unsigned long) xaddr;
 260         jensen_set_hae(addr);
 261         addr &= JENSEN_HAE_MASK;
 262         *(vuip) ((addr << 7) + EISA_MEM + 0x20) = b * 0x00010001;
 263 }
 264
 265 __EXTERN_INLINE void jensen_writel(u32 b, volatile void __iomem *xaddr)
 266 {
 267         unsigned long addr = (unsigned long) xaddr;
 268         jensen_set_hae(addr);
 269         addr &= JENSEN_HAE_MASK;
 270         *(vuip) ((addr << 7) + EISA_MEM + 0x60) = b;
 271 }
 272
 273 __EXTERN_INLINE void jensen_writeq(u64 b, volatile void __iomem *xaddr)
 274 {
 275         unsigned long addr = (unsigned long) xaddr;
 276         jensen_set_hae(addr);
 277         addr &= JENSEN_HAE_MASK;
 278         addr = (addr << 7) + EISA_MEM + 0x60;
 279         *(vuip) (addr) = b;
 280         *(vuip) (addr + (4 << 7)) = b >> 32;
 281 }
 282
 283 __EXTERN_INLINE void __iomem *jensen_ioportmap(unsigned long addr)
 284 {
 285         return (void __iomem *)addr;
 286 }
 287
 288 __EXTERN_INLINE void __iomem *jensen_ioremap(unsigned long addr,
 289                                              unsigned long size)
 290 {
 291         return (void __iomem *)(addr + 0x100000000ul);
 292 }
 293
 294 __EXTERN_INLINE int jensen_is_ioaddr(unsigned long addr)
 295 {
 296         return (long)addr >= 0;
 297 }
 298
 299 __EXTERN_INLINE int jensen_is_mmio(const volatile void __iomem *addr)
 300 {
 301         return (unsigned long)addr >= 0x100000000ul;
 302 }
 303
 304 /* New-style ioread interface.  All the routines are so ugly for Jensen
 305    that it doesn't make sense to merge them.  */
 306
 307 #define IOPORT(OS, NS)                                                  \
 308 __EXTERN_INLINE unsigned int jensen_ioread##NS(void __iomem *xaddr)     \
 309 {                                                                       \
 310         if (jensen_is_mmio(xaddr))                                      \
 311                 return jensen_read##OS(xaddr - 0x100000000ul);          \
 312         else                                                            \
 313                 return jensen_in##OS((unsigned long)xaddr);             \
 314 }                                                                       \
 315 __EXTERN_INLINE void jensen_iowrite##NS(u##NS b, void __iomem *xaddr)   \
 316 {                                                                       \
 317         if (jensen_is_mmio(xaddr))                                      \
 318                 jensen_write##OS(b, xaddr - 0x100000000ul);             \
 319         else                                                            \
 320                 jensen_out##OS(b, (unsigned long)xaddr);                \
 321 }
 322
 323 IOPORT(b, 8)
 324 IOPORT(w, 16)
 325 IOPORT(l, 32)
 326
 327 #undef IOPORT
 328
 329 #undef vuip
 330
 331 #undef __IO_PREFIX
 332 #define __IO_PREFIX             jensen
 333 #define jensen_trivial_rw_bw    0
 334 #define jensen_trivial_rw_lq    0
 335 #define jensen_trivial_io_bw    0
 336 #define jensen_trivial_io_lq    0
 337 #define jensen_trivial_iounmap  1
 338 #include <asm/io_trivial.h>
 339
 340 #ifdef __IO_EXTERN_INLINE
 341 #undef __EXTERN_INLINE
 342 #undef __IO_EXTERN_INLINE
 343 #endif
 344
 345 #endif /* __KERNEL__ */
 346
 347 #endif /* __ALPHA_JENSEN_H */