arch/sparc/lib/PeeCeeI.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * PeeCeeI.c: The emerging standard...
   4  *
   5  * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
   6  */
   7
   8 #include <linux/module.h>
   9
  10 #include <asm/io.h>
  11 #include <asm/byteorder.h>
  12
  13 void outsb(unsigned long __addr, const void *src, unsigned long count)
  14 {
  15         void __iomem *addr = (void __iomem *) __addr;
  16         const u8 *p = src;
  17
  18         while (count--)
  19                 __raw_writeb(*p++, addr);
  20 }
  21 EXPORT_SYMBOL(outsb);
  22
  23 void outsw(unsigned long __addr, const void *src, unsigned long count)
  24 {
  25         void __iomem *addr = (void __iomem *) __addr;
  26
  27         while (count--) {
  28                 __raw_writew(*(u16 *)src, addr);
  29                 src += sizeof(u16);
  30         }
  31 }
  32 EXPORT_SYMBOL(outsw);
  33
  34 void outsl(unsigned long __addr, const void *src, unsigned long count)
  35 {
  36         void __iomem *addr = (void __iomem *) __addr;
  37         u32 l, l2;
  38
  39         if (!count)
  40                 return;
  41
  42         switch (((unsigned long)src) & 0x3) {
  43         case 0x0:
  44                 /* src is naturally aligned */
  45                 while (count--) {
  46                         __raw_writel(*(u32 *)src, addr);
  47                         src += sizeof(u32);
  48                 }
  49                 break;
  50         case 0x2:
  51                 /* 2-byte alignment */
  52                 while (count--) {
  53                         l = (*(u16 *)src) << 16;
  54                         l |= *(u16 *)(src + sizeof(u16));
  55                         __raw_writel(l, addr);
  56                         src += sizeof(u32);
  57                 }
  58                 break;
  59         case 0x1:
  60                 /* Hold three bytes in l each time, grab a byte from l2 */
  61                 l = (*(u8 *)src) << 24;
  62                 l |= (*(u16 *)(src + sizeof(u8))) << 8;
  63                 src += sizeof(u8) + sizeof(u16);
  64                 while (count--) {
  65                         l2 = *(u32 *)src;
  66                         l |= (l2 >> 24);
  67                         __raw_writel(l, addr);
  68                         l = l2 << 8;
  69                         src += sizeof(u32);
  70                 }
  71                 break;
  72         case 0x3:
  73                 /* Hold a byte in l each time, grab 3 bytes from l2 */
  74                 l = (*(u8 *)src) << 24;
  75                 src += sizeof(u8);
  76                 while (count--) {
  77                         l2 = *(u32 *)src;
  78                         l |= (l2 >> 8);
  79                         __raw_writel(l, addr);
  80                         l = l2 << 24;
  81                         src += sizeof(u32);
  82                 }
  83                 break;
  84         }
  85 }
  86 EXPORT_SYMBOL(outsl);
  87
  88 void insb(unsigned long __addr, void *dst, unsigned long count)
  89 {
  90         void __iomem *addr = (void __iomem *) __addr;
  91
  92         if (count) {
  93                 u32 *pi;
  94                 u8 *pb = dst;
  95
  96                 while ((((unsigned long)pb) & 0x3) && count--)
  97                         *pb++ = __raw_readb(addr);
  98                 pi = (u32 *)pb;
  99                 while (count >= 4) {
 100                         u32 w;
 101
 102                         w  = (__raw_readb(addr) << 24);
 103                         w |= (__raw_readb(addr) << 16);
 104                         w |= (__raw_readb(addr) << 8);
 105                         w |= (__raw_readb(addr) << 0);
 106                         *pi++ = w;
 107                         count -= 4;
 108                 }
 109                 pb = (u8 *)pi;
 110                 while (count--)
 111                         *pb++ = __raw_readb(addr);
 112         }
 113 }
 114 EXPORT_SYMBOL(insb);
 115
 116 void insw(unsigned long __addr, void *dst, unsigned long count)
 117 {
 118         void __iomem *addr = (void __iomem *) __addr;
 119
 120         if (count) {
 121                 u16 *ps = dst;
 122                 u32 *pi;
 123
 124                 if (((unsigned long)ps) & 0x2) {
 125                         *ps++ = __raw_readw(addr);
 126                         count--;
 127                 }
 128                 pi = (u32 *)ps;
 129                 while (count >= 2) {
 130                         u32 w;
 131
 132                         w  = __raw_readw(addr) << 16;
 133                         w |= __raw_readw(addr) << 0;
 134                         *pi++ = w;
 135                         count -= 2;
 136                 }
 137                 ps = (u16 *)pi;
 138                 if (count)
 139                         *ps = __raw_readw(addr);
 140         }
 141 }
 142 EXPORT_SYMBOL(insw);
 143
 144 void insl(unsigned long __addr, void *dst, unsigned long count)
 145 {
 146         void __iomem *addr = (void __iomem *) __addr;
 147
 148         if (count) {
 149                 if ((((unsigned long)dst) & 0x3) == 0) {
 150                         u32 *pi = dst;
 151                         while (count--)
 152                                 *pi++ = __raw_readl(addr);
 153                 } else {
 154                         u32 l = 0, l2, *pi;
 155                         u16 *ps;
 156                         u8 *pb;
 157
 158                         switch (((unsigned long)dst) & 3) {
 159                         case 0x2:
 160                                 ps = dst;
 161                                 count -= 1;
 162                                 l = __raw_readl(addr);
 163                                 *ps++ = l;
 164                                 pi = (u32 *)ps;
 165                                 while (count--) {
 166                                         l2 = __raw_readl(addr);
 167                                         *pi++ = (l << 16) | (l2 >> 16);
 168                                         l = l2;
 169                                 }
 170                                 ps = (u16 *)pi;
 171                                 *ps = l;
 172                                 break;
 173
 174                         case 0x1:
 175                                 pb = dst;
 176                                 count -= 1;
 177                                 l = __raw_readl(addr);
 178                                 *pb++ = l >> 24;
 179                                 ps = (u16 *)pb;
 180                                 *ps++ = ((l >> 8) & 0xffff);
 181                                 pi = (u32 *)ps;
 182                                 while (count--) {
 183                                         l2 = __raw_readl(addr);
 184                                         *pi++ = (l << 24) | (l2 >> 8);
 185                                         l = l2;
 186                                 }
 187                                 pb = (u8 *)pi;
 188                                 *pb = l;
 189                                 break;
 190
 191                         case 0x3:
 192                                 pb = (u8 *)dst;
 193                                 count -= 1;
 194                                 l = __raw_readl(addr);
 195                                 *pb++ = l >> 24;
 196                                 pi = (u32 *)pb;
 197                                 while (count--) {
 198                                         l2 = __raw_readl(addr);
 199                                         *pi++ = (l << 8) | (l2 >> 24);
 200                                         l = l2;
 201                                 }
 202                                 ps = (u16 *)pi;
 203                                 *ps++ = ((l >> 8) & 0xffff);
 204                                 pb = (u8 *)ps;
 205                                 *pb = l;
 206                                 break;
 207                         }
 208                 }
 209         }
 210 }
 211 EXPORT_SYMBOL(insl);
 212