include/asm-sh/io.h

   1 /*
   2  *  linux/include/asm-sh/io.h
   3  *
   4  *  Copyright (C) 1996-2000 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Modifications:
  11  *  16-Sep-1996 RMK     Inlined the inx/outx functions & optimised for both
  12  *                      constant addresses and variable addresses.
  13  *  04-Dec-1997 RMK     Moved a lot of this stuff to the new architecture
  14  *                      specific IO header files.
  15  *  27-Mar-1999 PJB     Second parameter of memcpy_toio is const..
  16  *  04-Apr-1999 PJB     Added check_signature.
  17  *  12-Dec-1999 RMK     More cleanups
  18  *  18-Jun-2000 RMK     Removed virt_to_* and friends definitions
  19  */
  20 #ifndef __ASM_SH_IO_H
  21 #define __ASM_SH_IO_H
  22
  23 #ifdef __KERNEL__
  24
  25 #include <linux/types.h>
  26 #include <asm/byteorder.h>
  27
  28 /*
  29  * Generic virtual read/write.  Note that we don't support half-word
  30  * read/writes.  We define __arch_*[bl] here, and leave __arch_*w
  31  * to the architecture specific code.
  32  */
  33 #define __arch_getb(a)                  (*(volatile unsigned char *)(a))
  34 #define __arch_getw(a)                  (*(volatile unsigned short *)(a))
  35 #define __arch_getl(a)                  (*(volatile unsigned int *)(a))
  36
  37 #define __arch_putb(v, a)               (*(volatile unsigned char *)(a) = (v))
  38 #define __arch_putw(v, a)               (*(volatile unsigned short *)(a) = (v))
  39 #define __arch_putl(v, a)               (*(volatile unsigned int *)(a) = (v))
  40
  41 extern void __raw_writesb(unsigned int addr, const void *data, int bytelen);
  42 extern void __raw_writesw(unsigned int addr, const void *data, int wordlen);
  43 extern void __raw_writesl(unsigned int addr, const void *data, int longlen);
  44
  45 extern void __raw_readsb(unsigned int addr, void *data, int bytelen);
  46 extern void __raw_readsw(unsigned int addr, void *data, int wordlen);
  47 extern void __raw_readsl(unsigned int addr, void *data, int longlen);
  48
  49 #define __raw_writeb(v, a)              __arch_putb(v, a)
  50 #define __raw_writew(v, a)              __arch_putw(v, a)
  51 #define __raw_writel(v, a)              __arch_putl(v, a)
  52
  53 #define __raw_readb(a)                  __arch_getb(a)
  54 #define __raw_readw(a)                  __arch_getw(a)
  55 #define __raw_readl(a)                  __arch_getl(a)
  56
  57 /*
  58  * The compiler seems to be incapable of optimising constants
  59  * properly.  Spell it out to the compiler in some cases.
  60  * These are only valid for small values of "off" (< 1<<12)
  61  */
  62 #define __raw_base_writeb(val, base, off)       __arch_base_putb(val, base, off)
  63 #define __raw_base_writew(val, base, off)       __arch_base_putw(val, base, off)
  64 #define __raw_base_writel(val, base, off)       __arch_base_putl(val, base, off)
  65
  66 #define __raw_base_readb(base, off)     __arch_base_getb(base, off)
  67 #define __raw_base_readw(base, off)     __arch_base_getw(base, off)
  68 #define __raw_base_readl(base, off)     __arch_base_getl(base, off)
  69
  70 /*
  71  * Now, pick up the machine-defined IO definitions
  72  */
  73 #if 0   /* XXX###XXX */
  74 #include <asm/arch/io.h>
  75 #endif  /* XXX###XXX */
  76
  77 /*
  78  *  IO port access primitives
  79  *  -------------------------
  80  *
  81  * The SH doesn't have special IO access instructions; all IO is memory
  82  * mapped.  Note that these are defined to perform little endian accesses
  83  * only.  Their primary purpose is to access PCI and ISA peripherals.
  84  *
  85  * The machine specific io.h include defines __io to translate an "IO"
  86  * address to a memory address.
  87  *
  88  * Note that we prevent GCC re-ordering or caching values in expressions
  89  * by introducing sequence points into the in*() definitions.  Note that
  90  * __raw_* do not guarantee this behaviour.
  91  *
  92  * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
  93  */
  94 #define outb(v, p)               __raw_writeb(v, p)
  95 #define outw(v, p)               __raw_writew(cpu_to_le16(v), p)
  96 #define outl(v, p)               __raw_writel(cpu_to_le32(v), p)
  97
  98 #define inb(p)  ({ unsigned int __v = __raw_readb(p); __v; })
  99 #define inw(p)  ({ unsigned int __v = __le16_to_cpu(__raw_readw(p)); __v; })
 100 #define inl(p)  ({ unsigned int __v = __le32_to_cpu(__raw_readl(p)); __v; })
 101
 102 #define outsb(p, d, l)                  __raw_writesb(p, d, l)
 103 #define outsw(p, d, l)                  __raw_writesw(p, d, l)
 104 #define outsl(p, d, l)                  __raw_writesl(p, d, l)
 105
 106 #define insb(p, d, l)                   __raw_readsb(p, d, l)
 107 #define insw(p, d, l)                   __raw_readsw(p, d, l)
 108 #define insl(p, d, l)                   __raw_readsl(p, d, l)
 109
 110 #define outb_p(val, port)               outb((val), (port))
 111 #define outw_p(val, port)               outw((val), (port))
 112 #define outl_p(val, port)               outl((val), (port))
 113 #define inb_p(port)                     inb((port))
 114 #define inw_p(port)                     inw((port))
 115 #define inl_p(port)                     inl((port))
 116
 117 #define outsb_p(port, from, len)                outsb(port, from, len)
 118 #define outsw_p(port, from, len)                outsw(port, from, len)
 119 #define outsl_p(port, from, len)                outsl(port, from, len)
 120 #define insb_p(port, to, len)           insb(port, to, len)
 121 #define insw_p(port, to, len)           insw(port, to, len)
 122 #define insl_p(port, to, len)           insl(port, to, len)
 123
 124 /* for U-Boot PCI */
 125 #define out_8(port, val)        outb(val, port)
 126 #define out_le16(port, val)     outw(val, port)
 127 #define out_le32(port, val)     outl(val, port)
 128 #define in_8(port)                      inb(port)
 129 #define in_le16(port)           inw(port)
 130 #define in_le32(port)           inl(port)
 131 /*
 132  * ioremap and friends.
 133  *
 134  * ioremap takes a PCI memory address, as specified in
 135  * linux/Documentation/IO-mapping.txt.  If you want a
 136  * physical address, use __ioremap instead.
 137  */
 138 extern void *__ioremap(unsigned long offset, size_t size, unsigned long flags);
 139 extern void __iounmap(void *addr);
 140
 141 /*
 142  * Generic ioremap support.
 143  *
 144  * Define:
 145  *  iomem_valid_addr(off,size)
 146  *  iomem_to_phys(off)
 147  */
 148 #ifdef iomem_valid_addr
 149 #define __arch_ioremap(off, sz, nocache)                                \
 150  ({                                                             \
 151         unsigned long _off = (off), _size = (sz);               \
 152         void *_ret = (void *)0;                                 \
 153         if (iomem_valid_addr(_off, _size))                      \
 154                 _ret = __ioremap(iomem_to_phys(_off), _size, 0);        \
 155         _ret;                                                   \
 156  })
 157
 158 #define __arch_iounmap __iounmap
 159 #endif
 160
 161 #define ioremap(off, sz)                        __arch_ioremap((off), (sz), 0)
 162 #define ioremap_nocache(off, sz)                __arch_ioremap((off), (sz), 1)
 163 #define iounmap(_addr)                  __arch_iounmap(_addr)
 164
 165 /*
 166  * DMA-consistent mapping functions.  These allocate/free a region of
 167  * uncached, unwrite-buffered mapped memory space for use with DMA
 168  * devices.  This is the "generic" version.  The PCI specific version
 169  * is in pci.h
 170  */
 171 extern void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle);
 172 extern void consistent_free(void *vaddr, size_t size, dma_addr_t handle);
 173 extern void consistent_sync(void *vaddr, size_t size, int rw);
 174
 175 /*
 176  * String version of IO memory access ops:
 177  */
 178 extern void _memcpy_fromio(void *, unsigned long, size_t);
 179 extern void _memcpy_toio(unsigned long, const void *, size_t);
 180 extern void _memset_io(unsigned long, int, size_t);
 181
 182 /*
 183  * If this architecture has PCI memory IO, then define the read/write
 184  * macros.  These should only be used with the cookie passed from
 185  * ioremap.
 186  */
 187 #ifdef __mem_pci
 188
 189 #define readb(c) ({ unsigned int __v = __raw_readb(__mem_pci(c)); __v; })
 190 #define readw(c)\
 191         ({ unsigned int __v = le16_to_cpu(__raw_readw(__mem_pci(c))); __v; })
 192 #define readl(c)\
 193         ({ unsigned int __v = le32_to_cpu(__raw_readl(__mem_pci(c))); __v; })
 194
 195 #define writeb(v, c)            __raw_writeb(v, __mem_pci(c))
 196 #define writew(v, c)            __raw_writew(cpu_to_le16(v), __mem_pci(c))
 197 #define writel(v, c)            __raw_writel(cpu_to_le32(v), __mem_pci(c))
 198
 199 #define memset_io(c, v, l)              _memset_io(__mem_pci(c), (v), (l))
 200 #define memcpy_fromio(a, c, l)  _memcpy_fromio((a), __mem_pci(c), (l))
 201 #define memcpy_toio(c, a, l)    _memcpy_toio(__mem_pci(c), (a), (l))
 202
 203 #define eth_io_copy_and_sum(s, c, l, b) \
 204                                 eth_copy_and_sum((s), __mem_pci(c), (l), (b))
 205
 206 static inline int
 207 check_signature(unsigned long io_addr, const unsigned char *signature,
 208                 int length)
 209 {
 210         int retval = 0;
 211         do {
 212                 if (readb(io_addr) != *signature)
 213                         goto out;
 214                 io_addr++;
 215                 signature++;
 216                 length--;
 217         } while (length);
 218         retval = 1;
 219 out:
 220         return retval;
 221 }
 222
 223 #elif !defined(readb)
 224
 225 #define readb(addr)     __raw_readb(addr)
 226 #define readw(addr)     __raw_readw(addr)
 227 #define readl(addr)     __raw_readl(addr)
 228 #define writeb(v, addr) __raw_writeb(v, addr)
 229 #define writew(v, addr) __raw_writew(v, addr)
 230 #define writel(v, addr) __raw_writel(v, addr)
 231
 232 #define check_signature(io, sig, len)   (0)
 233
 234 #endif  /* __mem_pci */
 235
 236 static inline void sync(void)
 237 {
 238 }
 239
 240 /*
 241  * Given a physical address and a length, return a virtual address
 242  * that can be used to access the memory range with the caching
 243  * properties specified by "flags".
 244  */
 245 #define MAP_NOCACHE     (0)
 246 #define MAP_WRCOMBINE   (0)
 247 #define MAP_WRBACK      (0)
 248 #define MAP_WRTHROUGH   (0)
 249
 250 static inline void *
 251 map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
 252 {
 253         return (void *)paddr;
 254 }
 255
 256 /*
 257  * Take down a mapping set up by map_physmem().
 258  */
 259 static inline void unmap_physmem(void *vaddr, unsigned long flags)
 260 {
 261
 262 }
 263
 264 static inline phys_addr_t virt_to_phys(void * vaddr)
 265 {
 266         return (phys_addr_t)(vaddr);
 267 }
 268
 269 #endif  /* __KERNEL__ */
 270 #endif  /* __ASM_SH_IO_H */