1 /* 2 * arch/sh/kernel/io.c - Machine independent I/O functions. 3 * 4 * Copyright (C) 2000 - 2009 Stuart Menefy 5 * Copyright (C) 2005 Paul Mundt 6 * 7 * This file is subject to the terms and conditions of the GNU General Public 8 * License. See the file "COPYING" in the main directory of this archive 9 * for more details. 10 */ 11 #include <linux/module.h> 12 #include <linux/pci.h> 13 #include <asm/machvec.h> 14 #include <asm/io.h> 15 16 /* 17 * Copy data from IO memory space to "real" memory space. 18 */ 19 void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned long count) 20 { 21 /* 22 * Would it be worthwhile doing byte and long transfers first 23 * to try and get aligned? 24 */ 25 #ifdef CONFIG_CPU_SH4 26 if ((count >= 0x20) && 27 (((u32)to & 0x1f) == 0) && (((u32)from & 0x3) == 0)) { 28 int tmp2, tmp3, tmp4, tmp5, tmp6; 29 30 __asm__ __volatile__( 31 "1: \n\t" 32 "mov.l @%7+, r0 \n\t" 33 "mov.l @%7+, %2 \n\t" 34 "movca.l r0, @%0 \n\t" 35 "mov.l @%7+, %3 \n\t" 36 "mov.l @%7+, %4 \n\t" 37 "mov.l @%7+, %5 \n\t" 38 "mov.l @%7+, %6 \n\t" 39 "mov.l @%7+, r7 \n\t" 40 "mov.l @%7+, r0 \n\t" 41 "mov.l %2, @(0x04,%0) \n\t" 42 "mov #0x20, %2 \n\t" 43 "mov.l %3, @(0x08,%0) \n\t" 44 "sub %2, %1 \n\t" 45 "mov.l %4, @(0x0c,%0) \n\t" 46 "cmp/hi %1, %2 ! T if 32 > count \n\t" 47 "mov.l %5, @(0x10,%0) \n\t" 48 "mov.l %6, @(0x14,%0) \n\t" 49 "mov.l r7, @(0x18,%0) \n\t" 50 "mov.l r0, @(0x1c,%0) \n\t" 51 "bf.s 1b \n\t" 52 " add #0x20, %0 \n\t" 53 : "=&r" (to), "=&r" (count), 54 "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4), 55 "=&r" (tmp5), "=&r" (tmp6), "=&r" (from) 56 : "7"(from), "0" (to), "1" (count) 57 : "r0", "r7", "t", "memory"); 58 } 59 #endif 60 61 if ((((u32)to | (u32)from) & 0x3) == 0) { 62 for (; count > 3; count -= 4) { 63 *(u32 *)to = *(volatile u32 *)from; 64 to += 4; 65 from += 4; 66 } 67 } 68 69 for (; count > 0; count--) { 70 *(u8 *)to = *(volatile u8 *)from; 71 to++; 72 from++; 73 } 74 75 mb(); 76 } 77 EXPORT_SYMBOL(memcpy_fromio); 78 79 /* 80 * Copy data from "real" memory space to IO memory space. 81 */ 82 void memcpy_toio(volatile void __iomem *to, const void *from, unsigned long count) 83 { 84 if ((((u32)to | (u32)from) & 0x3) == 0) { 85 for ( ; count > 3; count -= 4) { 86 *(volatile u32 *)to = *(u32 *)from; 87 to += 4; 88 from += 4; 89 } 90 } 91 92 for (; count > 0; count--) { 93 *(volatile u8 *)to = *(u8 *)from; 94 to++; 95 from++; 96 } 97 98 mb(); 99 } 100 EXPORT_SYMBOL(memcpy_toio); 101 102 /* 103 * "memset" on IO memory space. 104 * This needs to be optimized. 105 */ 106 void memset_io(volatile void __iomem *dst, int c, unsigned long count) 107 { 108 while (count) { 109 count--; 110 writeb(c, dst); 111 dst++; 112 } 113 } 114 EXPORT_SYMBOL(memset_io); 115