arch/m68k/include/asm/io_no.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _M68KNOMMU_IO_H
   3 #define _M68KNOMMU_IO_H
   4
   5 #ifdef __KERNEL__
   6
   7 #define ARCH_HAS_IOREMAP_WT
   8
   9 #include <asm/virtconvert.h>
  10 #include <asm-generic/iomap.h>
  11
  12 /*
  13  * These are for ISA/PCI shared memory _only_ and should never be used
  14  * on any other type of memory, including Zorro memory. They are meant to
  15  * access the bus in the bus byte order which is little-endian!.
  16  *
  17  * readX/writeX() are used to access memory mapped devices. On some
  18  * architectures the memory mapped IO stuff needs to be accessed
  19  * differently. On the m68k architecture, we just read/write the
  20  * memory location directly.
  21  */
  22 /* ++roman: The assignments to temp. vars avoid that gcc sometimes generates
  23  * two accesses to memory, which may be undesirable for some devices.
  24  */
  25
  26 /*
  27  * swap functions are sometimes needed to interface little-endian hardware
  28  */
  29 static inline unsigned short _swapw(volatile unsigned short v)
  30 {
  31     return ((v << 8) | (v >> 8));
  32 }
  33
  34 static inline unsigned int _swapl(volatile unsigned long v)
  35 {
  36     return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
  37 }
  38
  39 #define readb(addr) \
  40     ({ unsigned char __v = (*(volatile unsigned char *) (addr)); __v; })
  41 #define readw(addr) \
  42     ({ unsigned short __v = (*(volatile unsigned short *) (addr)); __v; })
  43 #define readl(addr) \
  44     ({ unsigned int __v = (*(volatile unsigned int *) (addr)); __v; })
  45
  46 #define writeb(b,addr) (void)((*(volatile unsigned char *) (addr)) = (b))
  47 #define writew(b,addr) (void)((*(volatile unsigned short *) (addr)) = (b))
  48 #define writel(b,addr) (void)((*(volatile unsigned int *) (addr)) = (b))
  49
  50 #define __raw_readb readb
  51 #define __raw_readw readw
  52 #define __raw_readl readl
  53 #define __raw_writeb writeb
  54 #define __raw_writew writew
  55 #define __raw_writel writel
  56
  57 static inline void io_outsb(unsigned int addr, const void *buf, int len)
  58 {
  59         volatile unsigned char *ap = (volatile unsigned char *) addr;
  60         unsigned char *bp = (unsigned char *) buf;
  61         while (len--)
  62                 *ap = *bp++;
  63 }
  64
  65 static inline void io_outsw(unsigned int addr, const void *buf, int len)
  66 {
  67         volatile unsigned short *ap = (volatile unsigned short *) addr;
  68         unsigned short *bp = (unsigned short *) buf;
  69         while (len--)
  70                 *ap = _swapw(*bp++);
  71 }
  72
  73 static inline void io_outsl(unsigned int addr, const void *buf, int len)
  74 {
  75         volatile unsigned int *ap = (volatile unsigned int *) addr;
  76         unsigned int *bp = (unsigned int *) buf;
  77         while (len--)
  78                 *ap = _swapl(*bp++);
  79 }
  80
  81 static inline void io_insb(unsigned int addr, void *buf, int len)
  82 {
  83         volatile unsigned char *ap = (volatile unsigned char *) addr;
  84         unsigned char *bp = (unsigned char *) buf;
  85         while (len--)
  86                 *bp++ = *ap;
  87 }
  88
  89 static inline void io_insw(unsigned int addr, void *buf, int len)
  90 {
  91         volatile unsigned short *ap = (volatile unsigned short *) addr;
  92         unsigned short *bp = (unsigned short *) buf;
  93         while (len--)
  94                 *bp++ = _swapw(*ap);
  95 }
  96
  97 static inline void io_insl(unsigned int addr, void *buf, int len)
  98 {
  99         volatile unsigned int *ap = (volatile unsigned int *) addr;
 100         unsigned int *bp = (unsigned int *) buf;
 101         while (len--)
 102                 *bp++ = _swapl(*ap);
 103 }
 104
 105 #define mmiowb()
 106
 107 /*
 108  *      make the short names macros so specific devices
 109  *      can override them as required
 110  */
 111
 112 #define memset_io(a,b,c)        memset((void *)(a),(b),(c))
 113 #define memcpy_fromio(a,b,c)    memcpy((a),(void *)(b),(c))
 114 #define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
 115
 116 #define inb(addr)    readb(addr)
 117 #define inw(addr)    readw(addr)
 118 #define inl(addr)    readl(addr)
 119 #define outb(x,addr) ((void) writeb(x,addr))
 120 #define outw(x,addr) ((void) writew(x,addr))
 121 #define outl(x,addr) ((void) writel(x,addr))
 122
 123 #define inb_p(addr)    inb(addr)
 124 #define inw_p(addr)    inw(addr)
 125 #define inl_p(addr)    inl(addr)
 126 #define outb_p(x,addr) outb(x,addr)
 127 #define outw_p(x,addr) outw(x,addr)
 128 #define outl_p(x,addr) outl(x,addr)
 129
 130 #define outsb(a,b,l) io_outsb(a,b,l)
 131 #define outsw(a,b,l) io_outsw(a,b,l)
 132 #define outsl(a,b,l) io_outsl(a,b,l)
 133
 134 #define insb(a,b,l) io_insb(a,b,l)
 135 #define insw(a,b,l) io_insw(a,b,l)
 136 #define insl(a,b,l) io_insl(a,b,l)
 137
 138 #define IO_SPACE_LIMIT 0xffffffff
 139
 140
 141 /* Values for nocacheflag and cmode */
 142 #define IOMAP_FULL_CACHING              0
 143 #define IOMAP_NOCACHE_SER               1
 144 #define IOMAP_NOCACHE_NONSER            2
 145 #define IOMAP_WRITETHROUGH              3
 146
 147 static inline void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
 148 {
 149         return (void *) physaddr;
 150 }
 151 static inline void *ioremap(unsigned long physaddr, unsigned long size)
 152 {
 153         return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 154 }
 155 static inline void *ioremap_nocache(unsigned long physaddr, unsigned long size)
 156 {
 157         return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 158 }
 159 static inline void *ioremap_wt(unsigned long physaddr, unsigned long size)
 160 {
 161         return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
 162 }
 163 static inline void *ioremap_fullcache(unsigned long physaddr, unsigned long size)
 164 {
 165         return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
 166 }
 167
 168 #define iounmap(addr)   do { } while(0)
 169
 170 /*
 171  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 172  * access
 173  */
 174 #define xlate_dev_mem_ptr(p)    __va(p)
 175
 176 /*
 177  * Convert a virtual cached pointer to an uncached pointer
 178  */
 179 #define xlate_dev_kmem_ptr(p)   p
 180
 181 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
 182 {
 183         return (void __iomem *) port;
 184 }
 185
 186 static inline void ioport_unmap(void __iomem *p)
 187 {
 188 }
 189
 190 #endif /* __KERNEL__ */
 191
 192 #endif /* _M68KNOMMU_IO_H */