arch/sh/include/asm/io.h

   1 #ifndef __ASM_SH_IO_H
   2 #define __ASM_SH_IO_H
   3
   4 /*
   5  * Convention:
   6  *    read{b,w,l,q}/write{b,w,l,q} are for PCI,
   7  *    while in{b,w,l}/out{b,w,l} are for ISA
   8  *
   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  *
  12  * While read{b,w,l,q} and write{b,w,l,q} contain memory barriers
  13  * automatically, there are also __raw versions, which do not.
  14  */
  15 #include <linux/errno.h>
  16 #include <asm/cache.h>
  17 #include <asm/system.h>
  18 #include <asm/addrspace.h>
  19 #include <asm/machvec.h>
  20 #include <asm/pgtable.h>
  21 #include <asm-generic/iomap.h>
  22
  23 #ifdef __KERNEL__
  24 #define __IO_PREFIX     generic
  25 #include <asm/io_generic.h>
  26 #include <asm/io_trapped.h>
  27
  28 #define __raw_writeb(v,a)       (__chk_io_ptr(a), *(volatile u8  __force *)(a) = (v))
  29 #define __raw_writew(v,a)       (__chk_io_ptr(a), *(volatile u16 __force *)(a) = (v))
  30 #define __raw_writel(v,a)       (__chk_io_ptr(a), *(volatile u32 __force *)(a) = (v))
  31 #define __raw_writeq(v,a)       (__chk_io_ptr(a), *(volatile u64 __force *)(a) = (v))
  32
  33 #define __raw_readb(a)          (__chk_io_ptr(a), *(volatile u8  __force *)(a))
  34 #define __raw_readw(a)          (__chk_io_ptr(a), *(volatile u16 __force *)(a))
  35 #define __raw_readl(a)          (__chk_io_ptr(a), *(volatile u32 __force *)(a))
  36 #define __raw_readq(a)          (__chk_io_ptr(a), *(volatile u64 __force *)(a))
  37
  38 #define readb_relaxed(c)        ({ u8  __v = __raw_readb(c); __v; })
  39 #define readw_relaxed(c)        ({ u16 __v = le16_to_cpu((__force __le16) \
  40                                         __raw_readw(c)); __v; })
  41 #define readl_relaxed(c)        ({ u32 __v = le32_to_cpu((__force __le32) \
  42                                         __raw_readl(c)); __v; })
  43 #define readq_relaxed(c)        ({ u64 __v = le64_to_cpu((__force __le64) \
  44                                         __raw_readq(c)); __v; })
  45
  46 #define writeb_relaxed(v,c)     ((void)__raw_writeb(v,c))
  47 #define writew_relaxed(v,c)     ((void)__raw_writew((__force u16) \
  48                                         cpu_to_le16(v),c))
  49 #define writel_relaxed(v,c)     ((void)__raw_writel((__force u32) \
  50                                         cpu_to_le32(v),c))
  51 #define writeq_relaxed(v,c)     ((void)__raw_writeq((__force u64) \
  52                                         cpu_to_le64(v),c))
  53
  54 #define readb(a)                ({ u8  r_ = readb_relaxed(a); rmb(); r_; })
  55 #define readw(a)                ({ u16 r_ = readw_relaxed(a); rmb(); r_; })
  56 #define readl(a)                ({ u32 r_ = readl_relaxed(a); rmb(); r_; })
  57 #define readq(a)                ({ u64 r_ = readq_relaxed(a); rmb(); r_; })
  58
  59 #define writeb(v,a)             ({ wmb(); writeb_relaxed((v),(a)); })
  60 #define writew(v,a)             ({ wmb(); writew_relaxed((v),(a)); })
  61 #define writel(v,a)             ({ wmb(); writel_relaxed((v),(a)); })
  62 #define writeq(v,a)             ({ wmb(); writeq_relaxed((v),(a)); })
  63
  64 #define readsb(p,d,l)           __raw_readsb(p,d,l)
  65 #define readsw(p,d,l)           __raw_readsw(p,d,l)
  66 #define readsl(p,d,l)           __raw_readsl(p,d,l)
  67
  68 #define writesb(p,d,l)          __raw_writesb(p,d,l)
  69 #define writesw(p,d,l)          __raw_writesw(p,d,l)
  70 #define writesl(p,d,l)          __raw_writesl(p,d,l)
  71
  72 #define __BUILD_UNCACHED_IO(bwlq, type)                                 \
  73 static inline type read##bwlq##_uncached(unsigned long addr)            \
  74 {                                                                       \
  75         type ret;                                                       \
  76         jump_to_uncached();                                             \
  77         ret = __raw_read##bwlq(addr);                                   \
  78         back_to_cached();                                               \
  79         return ret;                                                     \
  80 }                                                                       \
  81                                                                         \
  82 static inline void write##bwlq##_uncached(type v, unsigned long addr)   \
  83 {                                                                       \
  84         jump_to_uncached();                                             \
  85         __raw_write##bwlq(v, addr);                                     \
  86         back_to_cached();                                               \
  87 }
  88
  89 __BUILD_UNCACHED_IO(b, u8)
  90 __BUILD_UNCACHED_IO(w, u16)
  91 __BUILD_UNCACHED_IO(l, u32)
  92 __BUILD_UNCACHED_IO(q, u64)
  93
  94 #define __BUILD_MEMORY_STRING(pfx, bwlq, type)                          \
  95                                                                         \
  96 static inline void                                                      \
  97 pfx##writes##bwlq(volatile void __iomem *mem, const void *addr,         \
  98                   unsigned int count)                                   \
  99 {                                                                       \
 100         const volatile type *__addr = addr;                             \
 101                                                                         \
 102         while (count--) {                                               \
 103                 __raw_write##bwlq(*__addr, mem);                        \
 104                 __addr++;                                               \
 105         }                                                               \
 106 }                                                                       \
 107                                                                         \
 108 static inline void pfx##reads##bwlq(volatile void __iomem *mem,         \
 109                                     void *addr, unsigned int count)     \
 110 {                                                                       \
 111         volatile type *__addr = addr;                                   \
 112                                                                         \
 113         while (count--) {                                               \
 114                 *__addr = __raw_read##bwlq(mem);                        \
 115                 __addr++;                                               \
 116         }                                                               \
 117 }
 118
 119 __BUILD_MEMORY_STRING(__raw_, b, u8)
 120 __BUILD_MEMORY_STRING(__raw_, w, u16)
 121
 122 #ifdef CONFIG_SUPERH32
 123 void __raw_writesl(void __iomem *addr, const void *data, int longlen);
 124 void __raw_readsl(const void __iomem *addr, void *data, int longlen);
 125 #else
 126 __BUILD_MEMORY_STRING(__raw_, l, u32)
 127 #endif
 128
 129 __BUILD_MEMORY_STRING(__raw_, q, u64)
 130
 131 #ifdef CONFIG_HAS_IOPORT
 132
 133 /*
 134  * Slowdown I/O port space accesses for antique hardware.
 135  */
 136 #undef CONF_SLOWDOWN_IO
 137
 138 /*
 139  * On SuperH I/O ports are memory mapped, so we access them using normal
 140  * load/store instructions. sh_io_port_base is the virtual address to
 141  * which all ports are being mapped.
 142  */
 143 extern const unsigned long sh_io_port_base;
 144
 145 static inline void __set_io_port_base(unsigned long pbase)
 146 {
 147         *(unsigned long *)&sh_io_port_base = pbase;
 148         barrier();
 149 }
 150
 151 #ifdef CONFIG_GENERIC_IOMAP
 152 #define __ioport_map ioport_map
 153 #else
 154 extern void __iomem *__ioport_map(unsigned long addr, unsigned int size);
 155 #endif
 156
 157 #ifdef CONF_SLOWDOWN_IO
 158 #define SLOW_DOWN_IO __raw_readw(sh_io_port_base)
 159 #else
 160 #define SLOW_DOWN_IO
 161 #endif
 162
 163 #define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p, slow)                 \
 164                                                                         \
 165 static inline void pfx##out##bwlq##p(type val, unsigned long port)      \
 166 {                                                                       \
 167         volatile type *__addr;                                          \
 168                                                                         \
 169         __addr = __ioport_map(port, sizeof(type));                      \
 170         *__addr = val;                                                  \
 171         slow;                                                           \
 172 }                                                                       \
 173                                                                         \
 174 static inline type pfx##in##bwlq##p(unsigned long port)                 \
 175 {                                                                       \
 176         volatile type *__addr;                                          \
 177         type __val;                                                     \
 178                                                                         \
 179         __addr = __ioport_map(port, sizeof(type));                      \
 180         __val = *__addr;                                                \
 181         slow;                                                           \
 182                                                                         \
 183         return __val;                                                   \
 184 }
 185
 186 #define __BUILD_IOPORT_PFX(bus, bwlq, type)                             \
 187         __BUILD_IOPORT_SINGLE(bus, bwlq, type, ,)                       \
 188         __BUILD_IOPORT_SINGLE(bus, bwlq, type, _p, SLOW_DOWN_IO)
 189
 190 #define BUILDIO_IOPORT(bwlq, type)                                      \
 191         __BUILD_IOPORT_PFX(, bwlq, type)
 192
 193 BUILDIO_IOPORT(b, u8)
 194 BUILDIO_IOPORT(w, u16)
 195 BUILDIO_IOPORT(l, u32)
 196 BUILDIO_IOPORT(q, u64)
 197
 198 #define __BUILD_IOPORT_STRING(bwlq, type)                               \
 199                                                                         \
 200 static inline void outs##bwlq(unsigned long port, const void *addr,     \
 201                               unsigned int count)                       \
 202 {                                                                       \
 203         const volatile type *__addr = addr;                             \
 204                                                                         \
 205         while (count--) {                                               \
 206                 out##bwlq(*__addr, port);                               \
 207                 __addr++;                                               \
 208         }                                                               \
 209 }                                                                       \
 210                                                                         \
 211 static inline void ins##bwlq(unsigned long port, void *addr,            \
 212                              unsigned int count)                        \
 213 {                                                                       \
 214         volatile type *__addr = addr;                                   \
 215                                                                         \
 216         while (count--) {                                               \
 217                 *__addr = in##bwlq(port);                               \
 218                 __addr++;                                               \
 219         }                                                               \
 220 }
 221
 222 __BUILD_IOPORT_STRING(b, u8)
 223 __BUILD_IOPORT_STRING(w, u16)
 224 __BUILD_IOPORT_STRING(l, u32)
 225 __BUILD_IOPORT_STRING(q, u64)
 226
 227 #endif
 228
 229 #define IO_SPACE_LIMIT 0xffffffff
 230
 231 /* synco on SH-4A, otherwise a nop */
 232 #define mmiowb()                wmb()
 233
 234 /* We really want to try and get these to memcpy etc */
 235 void memcpy_fromio(void *, const volatile void __iomem *, unsigned long);
 236 void memcpy_toio(volatile void __iomem *, const void *, unsigned long);
 237 void memset_io(volatile void __iomem *, int, unsigned long);
 238
 239 /* Quad-word real-mode I/O, don't ask.. */
 240 unsigned long long peek_real_address_q(unsigned long long addr);
 241 unsigned long long poke_real_address_q(unsigned long long addr,
 242                                        unsigned long long val);
 243
 244 #if !defined(CONFIG_MMU)
 245 #define virt_to_phys(address)   ((unsigned long)(address))
 246 #define phys_to_virt(address)   ((void *)(address))
 247 #else
 248 #define virt_to_phys(address)   (__pa(address))
 249 #define phys_to_virt(address)   (__va(address))
 250 #endif
 251
 252 /*
 253  * On 32-bit SH, we traditionally have the whole physical address space
 254  * mapped at all times (as MIPS does), so "ioremap()" and "iounmap()" do
 255  * not need to do anything but place the address in the proper segment.
 256  * This is true for P1 and P2 addresses, as well as some P3 ones.
 257  * However, most of the P3 addresses and newer cores using extended
 258  * addressing need to map through page tables, so the ioremap()
 259  * implementation becomes a bit more complicated.
 260  *
 261  * See arch/sh/mm/ioremap.c for additional notes on this.
 262  *
 263  * We cheat a bit and always return uncachable areas until we've fixed
 264  * the drivers to handle caching properly.
 265  *
 266  * On the SH-5 the concept of segmentation in the 1:1 PXSEG sense simply
 267  * doesn't exist, so everything must go through page tables.
 268  */
 269 #ifdef CONFIG_MMU
 270 void __iomem *__ioremap_caller(phys_addr_t offset, unsigned long size,
 271                                pgprot_t prot, void *caller);
 272 void __iounmap(void __iomem *addr);
 273
 274 static inline void __iomem *
 275 __ioremap(phys_addr_t offset, unsigned long size, pgprot_t prot)
 276 {
 277         return __ioremap_caller(offset, size, prot, __builtin_return_address(0));
 278 }
 279
 280 static inline void __iomem *
 281 __ioremap_29bit(phys_addr_t offset, unsigned long size, pgprot_t prot)
 282 {
 283 #ifdef CONFIG_29BIT
 284         phys_addr_t last_addr = offset + size - 1;
 285
 286         /*
 287          * For P1 and P2 space this is trivial, as everything is already
 288          * mapped. Uncached access for P1 addresses are done through P2.
 289          * In the P3 case or for addresses outside of the 29-bit space,
 290          * mapping must be done by the PMB or by using page tables.
 291          */
 292         if (likely(PXSEG(offset) < P3SEG && PXSEG(last_addr) < P3SEG)) {
 293                 u64 flags = pgprot_val(prot);
 294
 295                 /*
 296                  * Anything using the legacy PTEA space attributes needs
 297                  * to be kicked down to page table mappings.
 298                  */
 299                 if (unlikely(flags & _PAGE_PCC_MASK))
 300                         return NULL;
 301                 if (unlikely(flags & _PAGE_CACHABLE))
 302                         return (void __iomem *)P1SEGADDR(offset);
 303
 304                 return (void __iomem *)P2SEGADDR(offset);
 305         }
 306
 307         /* P4 above the store queues are always mapped. */
 308         if (unlikely(offset >= P3_ADDR_MAX))
 309                 return (void __iomem *)P4SEGADDR(offset);
 310 #endif
 311
 312         return NULL;
 313 }
 314
 315 static inline void __iomem *
 316 __ioremap_mode(phys_addr_t offset, unsigned long size, pgprot_t prot)
 317 {
 318         void __iomem *ret;
 319
 320         ret = __ioremap_trapped(offset, size);
 321         if (ret)
 322                 return ret;
 323
 324         ret = __ioremap_29bit(offset, size, prot);
 325         if (ret)
 326                 return ret;
 327
 328         return __ioremap(offset, size, prot);
 329 }
 330 #else
 331 #define __ioremap(offset, size, prot)           ((void __iomem *)(offset))
 332 #define __ioremap_mode(offset, size, prot)      ((void __iomem *)(offset))
 333 #define __iounmap(addr)                         do { } while (0)
 334 #endif /* CONFIG_MMU */
 335
 336 static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
 337 {
 338         return __ioremap_mode(offset, size, PAGE_KERNEL_NOCACHE);
 339 }
 340
 341 static inline void __iomem *
 342 ioremap_cache(phys_addr_t offset, unsigned long size)
 343 {
 344         return __ioremap_mode(offset, size, PAGE_KERNEL);
 345 }
 346
 347 #ifdef CONFIG_HAVE_IOREMAP_PROT
 348 static inline void __iomem *
 349 ioremap_prot(phys_addr_t offset, unsigned long size, unsigned long flags)
 350 {
 351         return __ioremap_mode(offset, size, __pgprot(flags));
 352 }
 353 #endif
 354
 355 #ifdef CONFIG_IOREMAP_FIXED
 356 extern void __iomem *ioremap_fixed(phys_addr_t, unsigned long, pgprot_t);
 357 extern int iounmap_fixed(void __iomem *);
 358 extern void ioremap_fixed_init(void);
 359 #else
 360 static inline void __iomem *
 361 ioremap_fixed(phys_addr_t phys_addr, unsigned long size, pgprot_t prot)
 362 {
 363         BUG();
 364         return NULL;
 365 }
 366
 367 static inline void ioremap_fixed_init(void) { }
 368 static inline int iounmap_fixed(void __iomem *addr) { return -EINVAL; }
 369 #endif
 370
 371 #define ioremap_nocache ioremap
 372 #define iounmap         __iounmap
 373
 374 /*
 375  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 376  * access
 377  */
 378 #define xlate_dev_mem_ptr(p)    __va(p)
 379
 380 /*
 381  * Convert a virtual cached pointer to an uncached pointer
 382  */
 383 #define xlate_dev_kmem_ptr(p)   p
 384
 385 #define ARCH_HAS_VALID_PHYS_ADDR_RANGE
 386 int valid_phys_addr_range(unsigned long addr, size_t size);
 387 int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
 388
 389 #endif /* __KERNEL__ */
 390
 391 #endif /* __ASM_SH_IO_H */