include/asm-sh/io.h

   1 #ifndef __ASM_SH_IO_H
   2 #define __ASM_SH_IO_H
   3
   4 /*
   5  * Convention:
   6  *    read{b,w,l}/write{b,w,l} are for PCI,
   7  *    while in{b,w,l}/out{b,w,l} are for ISA
   8  * These may (will) be platform specific function.
   9  * In addition we have 'pausing' versions: in{b,w,l}_p/out{b,w,l}_p
  10  * and 'string' versions: ins{b,w,l}/outs{b,w,l}
  11  * For read{b,w,l} and write{b,w,l} there are also __raw versions, which
  12  * do not have a memory barrier after them.
  13  *
  14  * In addition, we have
  15  *   ctrl_in{b,w,l}/ctrl_out{b,w,l} for SuperH specific I/O.
  16  *   which are processor specific.
  17  */
  18
  19 /*
  20  * We follow the Alpha convention here:
  21  *  __inb expands to an inline function call (which calls via the mv)
  22  *  _inb  is a real function call (note ___raw fns are _ version of __raw)
  23  *  inb   by default expands to _inb, but the machine specific code may
  24  *        define it to __inb if it chooses.
  25  */
  26 #include <asm/cache.h>
  27 #include <asm/system.h>
  28 #include <asm/addrspace.h>
  29 #include <asm/machvec.h>
  30 #include <asm/pgtable.h>
  31 #include <asm-generic/iomap.h>
  32
  33 #ifdef __KERNEL__
  34
  35 /*
  36  * Depending on which platform we are running on, we need different
  37  * I/O functions.
  38  */
  39 #define __IO_PREFIX     generic
  40 #include <asm/io_generic.h>
  41 #include <asm/io_trapped.h>
  42
  43 #define maybebadio(port) \
  44   printk(KERN_ERR "bad PC-like io %s:%u for port 0x%lx at 0x%08x\n", \
  45          __FUNCTION__, __LINE__, (port), (u32)__builtin_return_address(0))
  46
  47 /*
  48  * Since boards are able to define their own set of I/O routines through
  49  * their respective machine vector, we always wrap through the mv.
  50  *
  51  * Also, in the event that a board hasn't provided its own definition for
  52  * a given routine, it will be wrapped to generic code at run-time.
  53  */
  54
  55 #define __inb(p)        sh_mv.mv_inb((p))
  56 #define __inw(p)        sh_mv.mv_inw((p))
  57 #define __inl(p)        sh_mv.mv_inl((p))
  58 #define __outb(x,p)     sh_mv.mv_outb((x),(p))
  59 #define __outw(x,p)     sh_mv.mv_outw((x),(p))
  60 #define __outl(x,p)     sh_mv.mv_outl((x),(p))
  61
  62 #define __inb_p(p)      sh_mv.mv_inb_p((p))
  63 #define __inw_p(p)      sh_mv.mv_inw_p((p))
  64 #define __inl_p(p)      sh_mv.mv_inl_p((p))
  65 #define __outb_p(x,p)   sh_mv.mv_outb_p((x),(p))
  66 #define __outw_p(x,p)   sh_mv.mv_outw_p((x),(p))
  67 #define __outl_p(x,p)   sh_mv.mv_outl_p((x),(p))
  68
  69 #define __insb(p,b,c)   sh_mv.mv_insb((p), (b), (c))
  70 #define __insw(p,b,c)   sh_mv.mv_insw((p), (b), (c))
  71 #define __insl(p,b,c)   sh_mv.mv_insl((p), (b), (c))
  72 #define __outsb(p,b,c)  sh_mv.mv_outsb((p), (b), (c))
  73 #define __outsw(p,b,c)  sh_mv.mv_outsw((p), (b), (c))
  74 #define __outsl(p,b,c)  sh_mv.mv_outsl((p), (b), (c))
  75
  76 #define __readb(a)      sh_mv.mv_readb((a))
  77 #define __readw(a)      sh_mv.mv_readw((a))
  78 #define __readl(a)      sh_mv.mv_readl((a))
  79 #define __writeb(v,a)   sh_mv.mv_writeb((v),(a))
  80 #define __writew(v,a)   sh_mv.mv_writew((v),(a))
  81 #define __writel(v,a)   sh_mv.mv_writel((v),(a))
  82
  83 #define inb             __inb
  84 #define inw             __inw
  85 #define inl             __inl
  86 #define outb            __outb
  87 #define outw            __outw
  88 #define outl            __outl
  89
  90 #define inb_p           __inb_p
  91 #define inw_p           __inw_p
  92 #define inl_p           __inl_p
  93 #define outb_p          __outb_p
  94 #define outw_p          __outw_p
  95 #define outl_p          __outl_p
  96
  97 #define insb            __insb
  98 #define insw            __insw
  99 #define insl            __insl
 100 #define outsb           __outsb
 101 #define outsw           __outsw
 102 #define outsl           __outsl
 103
 104 #define __raw_readb(a)          __readb((void __iomem *)(a))
 105 #define __raw_readw(a)          __readw((void __iomem *)(a))
 106 #define __raw_readl(a)          __readl((void __iomem *)(a))
 107 #define __raw_writeb(v, a)      __writeb(v, (void __iomem *)(a))
 108 #define __raw_writew(v, a)      __writew(v, (void __iomem *)(a))
 109 #define __raw_writel(v, a)      __writel(v, (void __iomem *)(a))
 110
 111 void __raw_writesl(unsigned long addr, const void *data, int longlen);
 112 void __raw_readsl(unsigned long addr, void *data, int longlen);
 113
 114 /*
 115  * The platform header files may define some of these macros to use
 116  * the inlined versions where appropriate.  These macros may also be
 117  * redefined by userlevel programs.
 118  */
 119 #ifdef __readb
 120 # define readb(a)       ({ unsigned int r_ = __raw_readb(a); mb(); r_; })
 121 #endif
 122 #ifdef __raw_readw
 123 # define readw(a)       ({ unsigned int r_ = __raw_readw(a); mb(); r_; })
 124 #endif
 125 #ifdef __raw_readl
 126 # define readl(a)       ({ unsigned int r_ = __raw_readl(a); mb(); r_; })
 127 #endif
 128
 129 #ifdef __raw_writeb
 130 # define writeb(v,a)    ({ __raw_writeb((v),(a)); mb(); })
 131 #endif
 132 #ifdef __raw_writew
 133 # define writew(v,a)    ({ __raw_writew((v),(a)); mb(); })
 134 #endif
 135 #ifdef __raw_writel
 136 # define writel(v,a)    ({ __raw_writel((v),(a)); mb(); })
 137 #endif
 138
 139 #define __BUILD_MEMORY_STRING(bwlq, type)                               \
 140                                                                         \
 141 static inline void writes##bwlq(volatile void __iomem *mem,             \
 142                                 const void *addr, unsigned int count)   \
 143 {                                                                       \
 144         const volatile type *__addr = addr;                             \
 145                                                                         \
 146         while (count--) {                                               \
 147                 __raw_write##bwlq(*__addr, mem);                        \
 148                 __addr++;                                               \
 149         }                                                               \
 150 }                                                                       \
 151                                                                         \
 152 static inline void reads##bwlq(volatile void __iomem *mem, void *addr,  \
 153                                unsigned int count)                      \
 154 {                                                                       \
 155         volatile type *__addr = addr;                                   \
 156                                                                         \
 157         while (count--) {                                               \
 158                 *__addr = __raw_read##bwlq(mem);                        \
 159                 __addr++;                                               \
 160         }                                                               \
 161 }
 162
 163 __BUILD_MEMORY_STRING(b, u8)
 164 __BUILD_MEMORY_STRING(w, u16)
 165 #define writesl __raw_writesl
 166 #define readsl  __raw_readsl
 167
 168 #define readb_relaxed(a) readb(a)
 169 #define readw_relaxed(a) readw(a)
 170 #define readl_relaxed(a) readl(a)
 171
 172 /* Simple MMIO */
 173 #define ioread8(a)              readb(a)
 174 #define ioread16(a)             readw(a)
 175 #define ioread16be(a)           be16_to_cpu(__raw_readw((a)))
 176 #define ioread32(a)             readl(a)
 177 #define ioread32be(a)           be32_to_cpu(__raw_readl((a)))
 178
 179 #define iowrite8(v,a)           writeb((v),(a))
 180 #define iowrite16(v,a)          writew((v),(a))
 181 #define iowrite16be(v,a)        __raw_writew(cpu_to_be16((v)),(a))
 182 #define iowrite32(v,a)          writel((v),(a))
 183 #define iowrite32be(v,a)        __raw_writel(cpu_to_be32((v)),(a))
 184
 185 #define ioread8_rep(a, d, c)    readsb((a), (d), (c))
 186 #define ioread16_rep(a, d, c)   readsw((a), (d), (c))
 187 #define ioread32_rep(a, d, c)   readsl((a), (d), (c))
 188
 189 #define iowrite8_rep(a, s, c)   writesb((a), (s), (c))
 190 #define iowrite16_rep(a, s, c)  writesw((a), (s), (c))
 191 #define iowrite32_rep(a, s, c)  writesl((a), (s), (c))
 192
 193 #define mmiowb()        wmb()   /* synco on SH-4A, otherwise a nop */
 194
 195 #define IO_SPACE_LIMIT 0xffffffff
 196
 197 /*
 198  * This function provides a method for the generic case where a board-specific
 199  * ioport_map simply needs to return the port + some arbitrary port base.
 200  *
 201  * We use this at board setup time to implicitly set the port base, and
 202  * as a result, we can use the generic ioport_map.
 203  */
 204 static inline void __set_io_port_base(unsigned long pbase)
 205 {
 206         extern unsigned long generic_io_base;
 207
 208         generic_io_base = pbase;
 209 }
 210
 211 #define __ioport_map(p, n) sh_mv.mv_ioport_map((p), (n))
 212
 213 /* We really want to try and get these to memcpy etc */
 214 extern void memcpy_fromio(void *, volatile void __iomem *, unsigned long);
 215 extern void memcpy_toio(volatile void __iomem *, const void *, unsigned long);
 216 extern void memset_io(volatile void __iomem *, int, unsigned long);
 217
 218 /* SuperH on-chip I/O functions */
 219 static inline unsigned char ctrl_inb(unsigned long addr)
 220 {
 221         return *(volatile unsigned char*)addr;
 222 }
 223
 224 static inline unsigned short ctrl_inw(unsigned long addr)
 225 {
 226         return *(volatile unsigned short*)addr;
 227 }
 228
 229 static inline unsigned int ctrl_inl(unsigned long addr)
 230 {
 231         return *(volatile unsigned long*)addr;
 232 }
 233
 234 static inline unsigned long long ctrl_inq(unsigned long addr)
 235 {
 236         return *(volatile unsigned long long*)addr;
 237 }
 238
 239 static inline void ctrl_outb(unsigned char b, unsigned long addr)
 240 {
 241         *(volatile unsigned char*)addr = b;
 242 }
 243
 244 static inline void ctrl_outw(unsigned short b, unsigned long addr)
 245 {
 246         *(volatile unsigned short*)addr = b;
 247 }
 248
 249 static inline void ctrl_outl(unsigned int b, unsigned long addr)
 250 {
 251         *(volatile unsigned long*)addr = b;
 252 }
 253
 254 static inline void ctrl_outq(unsigned long long b, unsigned long addr)
 255 {
 256         *(volatile unsigned long long*)addr = b;
 257 }
 258
 259 static inline void ctrl_delay(void)
 260 {
 261 #ifdef P2SEG
 262         ctrl_inw(P2SEG);
 263 #endif
 264 }
 265
 266 /* Quad-word real-mode I/O, don't ask.. */
 267 unsigned long long peek_real_address_q(unsigned long long addr);
 268 unsigned long long poke_real_address_q(unsigned long long addr,
 269                                        unsigned long long val);
 270
 271 #if !defined(CONFIG_MMU)
 272 #define virt_to_phys(address)   ((unsigned long)(address))
 273 #define phys_to_virt(address)   ((void *)(address))
 274 #else
 275 #define virt_to_phys(address)   (__pa(address))
 276 #define phys_to_virt(address)   (__va(address))
 277 #endif
 278
 279 /*
 280  * On 32-bit SH, we traditionally have the whole physical address space
 281  * mapped at all times (as MIPS does), so "ioremap()" and "iounmap()" do
 282  * not need to do anything but place the address in the proper segment.
 283  * This is true for P1 and P2 addresses, as well as some P3 ones.
 284  * However, most of the P3 addresses and newer cores using extended
 285  * addressing need to map through page tables, so the ioremap()
 286  * implementation becomes a bit more complicated.
 287  *
 288  * See arch/sh/mm/ioremap.c for additional notes on this.
 289  *
 290  * We cheat a bit and always return uncachable areas until we've fixed
 291  * the drivers to handle caching properly.
 292  *
 293  * On the SH-5 the concept of segmentation in the 1:1 PXSEG sense simply
 294  * doesn't exist, so everything must go through page tables.
 295  */
 296 #ifdef CONFIG_MMU
 297 void __iomem *__ioremap(unsigned long offset, unsigned long size,
 298                         unsigned long flags);
 299 void __iounmap(void __iomem *addr);
 300
 301 /* arch/sh/mm/ioremap_64.c */
 302 unsigned long onchip_remap(unsigned long addr, unsigned long size,
 303                            const char *name);
 304 extern void onchip_unmap(unsigned long vaddr);
 305 #else
 306 #define __ioremap(offset, size, flags)  ((void __iomem *)(offset))
 307 #define __iounmap(addr)                 do { } while (0)
 308 #define onchip_remap(addr, size, name)  (addr)
 309 #define onchip_unmap(addr)              do { } while (0)
 310 #endif /* CONFIG_MMU */
 311
 312 static inline void __iomem *
 313 __ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags)
 314 {
 315 #ifdef CONFIG_SUPERH32
 316         unsigned long last_addr = offset + size - 1;
 317 #endif
 318         void __iomem *ret;
 319
 320         ret = __ioremap_trapped(offset, size);
 321         if (ret)
 322                 return ret;
 323
 324 #ifdef CONFIG_SUPERH32
 325         /*
 326          * For P1 and P2 space this is trivial, as everything is already
 327          * mapped. Uncached access for P1 addresses are done through P2.
 328          * In the P3 case or for addresses outside of the 29-bit space,
 329          * mapping must be done by the PMB or by using page tables.
 330          */
 331         if (likely(PXSEG(offset) < P3SEG && PXSEG(last_addr) < P3SEG)) {
 332                 if (unlikely(flags & _PAGE_CACHABLE))
 333                         return (void __iomem *)P1SEGADDR(offset);
 334
 335                 return (void __iomem *)P2SEGADDR(offset);
 336         }
 337 #endif
 338
 339         return __ioremap(offset, size, flags);
 340 }
 341
 342 #define ioremap(offset, size)                           \
 343         __ioremap_mode((offset), (size), 0)
 344 #define ioremap_nocache(offset, size)                   \
 345         __ioremap_mode((offset), (size), 0)
 346 #define ioremap_cache(offset, size)                     \
 347         __ioremap_mode((offset), (size), _PAGE_CACHABLE)
 348 #define p3_ioremap(offset, size, flags)                 \
 349         __ioremap((offset), (size), (flags))
 350 #define iounmap(addr)                                   \
 351         __iounmap((addr))
 352
 353 /*
 354  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 355  * access
 356  */
 357 #define xlate_dev_mem_ptr(p)    __va(p)
 358
 359 /*
 360  * Convert a virtual cached pointer to an uncached pointer
 361  */
 362 #define xlate_dev_kmem_ptr(p)   p
 363
 364 #endif /* __KERNEL__ */
 365
 366 #endif /* __ASM_SH_IO_H */