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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 | /* * I/O string operations * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * Copyright (C) 2006 IBM Corporation * * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) * and Paul Mackerras. * * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com) * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) * * Rewritten in C by Stephen Rothwell. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/kernel.h> #include <linux/types.h> #include <linux/compiler.h> #include <linux/export.h> #include <asm/io.h> #include <asm/firmware.h> #include <asm/bug.h> /* See definition in io.h */ bool isa_io_special; void _insb(const volatile u8 __iomem *port, void *buf, long count) { u8 *tbuf = buf; u8 tmp; if (unlikely(count <= 0)) return; asm volatile("sync"); do { tmp = *port; eieio(); *tbuf++ = tmp; } while (--count != 0); asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); } EXPORT_SYMBOL(_insb); void _outsb(volatile u8 __iomem *port, const void *buf, long count) { const u8 *tbuf = buf; if (unlikely(count <= 0)) return; asm volatile("sync"); do { *port = *tbuf++; } while (--count != 0); asm volatile("sync"); } EXPORT_SYMBOL(_outsb); void _insw_ns(const volatile u16 __iomem *port, void *buf, long count) { u16 *tbuf = buf; u16 tmp; if (unlikely(count <= 0)) return; asm volatile("sync"); do { tmp = *port; eieio(); *tbuf++ = tmp; } while (--count != 0); asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); } EXPORT_SYMBOL(_insw_ns); void _outsw_ns(volatile u16 __iomem *port, const void *buf, long count) { const u16 *tbuf = buf; if (unlikely(count <= 0)) return; asm volatile("sync"); do { *port = *tbuf++; } while (--count != 0); asm volatile("sync"); } EXPORT_SYMBOL(_outsw_ns); void _insl_ns(const volatile u32 __iomem *port, void *buf, long count) { u32 *tbuf = buf; u32 tmp; if (unlikely(count <= 0)) return; asm volatile("sync"); do { tmp = *port; eieio(); *tbuf++ = tmp; } while (--count != 0); asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); } EXPORT_SYMBOL(_insl_ns); void _outsl_ns(volatile u32 __iomem *port, const void *buf, long count) { const u32 *tbuf = buf; if (unlikely(count <= 0)) return; asm volatile("sync"); do { *port = *tbuf++; } while (--count != 0); asm volatile("sync"); } EXPORT_SYMBOL(_outsl_ns); #define IO_CHECK_ALIGN(v,a) ((((unsigned long)(v)) & ((a) - 1)) == 0) notrace void _memset_io(volatile void __iomem *addr, int c, unsigned long n) { void *p = (void __force *)addr; u32 lc = c; lc |= lc << 8; lc |= lc << 16; __asm__ __volatile__ ("sync" : : : "memory"); while(n && !IO_CHECK_ALIGN(p, 4)) { *((volatile u8 *)p) = c; p++; n--; } while(n >= 4) { *((volatile u32 *)p) = lc; p += 4; n -= 4; } while(n) { *((volatile u8 *)p) = c; p++; n--; } __asm__ __volatile__ ("sync" : : : "memory"); } EXPORT_SYMBOL(_memset_io); void _memcpy_fromio(void *dest, const volatile void __iomem *src, unsigned long n) { void *vsrc = (void __force *) src; __asm__ __volatile__ ("sync" : : : "memory"); while(n && (!IO_CHECK_ALIGN(vsrc, 4) || !IO_CHECK_ALIGN(dest, 4))) { *((u8 *)dest) = *((volatile u8 *)vsrc); eieio(); vsrc++; dest++; n--; } while(n >= 4) { *((u32 *)dest) = *((volatile u32 *)vsrc); eieio(); vsrc += 4; dest += 4; n -= 4; } while(n) { *((u8 *)dest) = *((volatile u8 *)vsrc); eieio(); vsrc++; dest++; n--; } __asm__ __volatile__ ("sync" : : : "memory"); } EXPORT_SYMBOL(_memcpy_fromio); void _memcpy_toio(volatile void __iomem *dest, const void *src, unsigned long n) { void *vdest = (void __force *) dest; __asm__ __volatile__ ("sync" : : : "memory"); while(n && (!IO_CHECK_ALIGN(vdest, 4) || !IO_CHECK_ALIGN(src, 4))) { *((volatile u8 *)vdest) = *((u8 *)src); src++; vdest++; n--; } while(n >= 4) { *((volatile u32 *)vdest) = *((volatile u32 *)src); src += 4; vdest += 4; n-=4; } while(n) { *((volatile u8 *)vdest) = *((u8 *)src); src++; vdest++; n--; } __asm__ __volatile__ ("sync" : : : "memory"); } EXPORT_SYMBOL(_memcpy_toio); |