1 /* 2 * I/O string operations 3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 4 * Copyright (C) 2006 IBM Corporation 5 * 6 * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) 7 * and Paul Mackerras. 8 * 9 * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com) 10 * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) 11 * 12 * Rewritten in C by Stephen Rothwell. 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License 16 * as published by the Free Software Foundation; either version 17 * 2 of the License, or (at your option) any later version. 18 */ 19 #include <linux/kernel.h> 20 #include <linux/types.h> 21 #include <linux/compiler.h> 22 #include <linux/module.h> 23 24 #include <asm/io.h> 25 #include <asm/firmware.h> 26 #include <asm/bug.h> 27 28 void _insb(volatile u8 __iomem *port, void *buf, long count) 29 { 30 u8 *tbuf = buf; 31 u8 tmp; 32 33 BUG_ON(firmware_has_feature(FW_FEATURE_ISERIES)); 34 35 if (unlikely(count <= 0)) 36 return; 37 asm volatile("sync"); 38 do { 39 tmp = *port; 40 asm volatile("eieio"); 41 *tbuf++ = tmp; 42 } while (--count != 0); 43 asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); 44 } 45 EXPORT_SYMBOL(_insb); 46 47 void _outsb(volatile u8 __iomem *port, const void *buf, long count) 48 { 49 const u8 *tbuf = buf; 50 51 BUG_ON(firmware_has_feature(FW_FEATURE_ISERIES)); 52 53 if (unlikely(count <= 0)) 54 return; 55 asm volatile("sync"); 56 do { 57 *port = *tbuf++; 58 } while (--count != 0); 59 asm volatile("sync"); 60 } 61 EXPORT_SYMBOL(_outsb); 62 63 void _insw_ns(volatile u16 __iomem *port, void *buf, long count) 64 { 65 u16 *tbuf = buf; 66 u16 tmp; 67 68 BUG_ON(firmware_has_feature(FW_FEATURE_ISERIES)); 69 70 if (unlikely(count <= 0)) 71 return; 72 asm volatile("sync"); 73 do { 74 tmp = *port; 75 asm volatile("eieio"); 76 *tbuf++ = tmp; 77 } while (--count != 0); 78 asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); 79 } 80 EXPORT_SYMBOL(_insw_ns); 81 82 void _outsw_ns(volatile u16 __iomem *port, const void *buf, long count) 83 { 84 const u16 *tbuf = buf; 85 86 BUG_ON(firmware_has_feature(FW_FEATURE_ISERIES)); 87 88 if (unlikely(count <= 0)) 89 return; 90 asm volatile("sync"); 91 do { 92 *port = *tbuf++; 93 } while (--count != 0); 94 asm volatile("sync"); 95 } 96 EXPORT_SYMBOL(_outsw_ns); 97 98 void _insl_ns(volatile u32 __iomem *port, void *buf, long count) 99 { 100 u32 *tbuf = buf; 101 u32 tmp; 102 103 BUG_ON(firmware_has_feature(FW_FEATURE_ISERIES)); 104 105 if (unlikely(count <= 0)) 106 return; 107 asm volatile("sync"); 108 do { 109 tmp = *port; 110 asm volatile("eieio"); 111 *tbuf++ = tmp; 112 } while (--count != 0); 113 asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); 114 } 115 EXPORT_SYMBOL(_insl_ns); 116 117 void _outsl_ns(volatile u32 __iomem *port, const void *buf, long count) 118 { 119 const u32 *tbuf = buf; 120 121 BUG_ON(firmware_has_feature(FW_FEATURE_ISERIES)); 122 123 if (unlikely(count <= 0)) 124 return; 125 asm volatile("sync"); 126 do { 127 *port = *tbuf++; 128 } while (--count != 0); 129 asm volatile("sync"); 130 } 131 EXPORT_SYMBOL(_outsl_ns); 132