2 * I/O string operations
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 * Copyright (C) 2006 IBM Corporation
6 * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
9 * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
10 * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
12 * Rewritten in C by Stephen Rothwell.
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.
19 #include <linux/kernel.h>
20 #include <linux/types.h>
21 #include <linux/compiler.h>
22 #include <linux/module.h>
25 #include <asm/firmware.h>
28 void _insb(const volatile u8 __iomem *port, void *buf, long count)
33 if (unlikely(count <= 0))
38 asm volatile("eieio");
40 } while (--count != 0);
41 asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
45 void _outsb(volatile u8 __iomem *port, const void *buf, long count)
49 if (unlikely(count <= 0))
54 } while (--count != 0);
57 EXPORT_SYMBOL(_outsb);
59 void _insw_ns(const volatile u16 __iomem *port, void *buf, long count)
64 if (unlikely(count <= 0))
69 asm volatile("eieio");
71 } while (--count != 0);
72 asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
74 EXPORT_SYMBOL(_insw_ns);
76 void _outsw_ns(volatile u16 __iomem *port, const void *buf, long count)
78 const u16 *tbuf = buf;
80 if (unlikely(count <= 0))
85 } while (--count != 0);
88 EXPORT_SYMBOL(_outsw_ns);
90 void _insl_ns(const volatile u32 __iomem *port, void *buf, long count)
95 if (unlikely(count <= 0))
100 asm volatile("eieio");
102 } while (--count != 0);
103 asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
105 EXPORT_SYMBOL(_insl_ns);
107 void _outsl_ns(volatile u32 __iomem *port, const void *buf, long count)
109 const u32 *tbuf = buf;
111 if (unlikely(count <= 0))
113 asm volatile("sync");
116 } while (--count != 0);
117 asm volatile("sync");
119 EXPORT_SYMBOL(_outsl_ns);
121 #define IO_CHECK_ALIGN(v,a) ((((unsigned long)(v)) & ((a) - 1)) == 0)
123 void _memset_io(volatile void __iomem *addr, int c, unsigned long n)
125 void *p = (void __force *)addr;
130 __asm__ __volatile__ ("sync" : : : "memory");
131 while(n && !IO_CHECK_ALIGN(p, 4)) {
132 *((volatile u8 *)p) = c;
137 *((volatile u32 *)p) = lc;
142 *((volatile u8 *)p) = c;
146 __asm__ __volatile__ ("sync" : : : "memory");
148 EXPORT_SYMBOL(_memset_io);
150 void _memcpy_fromio(void *dest, const volatile void __iomem *src,
153 void *vsrc = (void __force *) src;
155 __asm__ __volatile__ ("sync" : : : "memory");
156 while(n && (!IO_CHECK_ALIGN(vsrc, 4) || !IO_CHECK_ALIGN(dest, 4))) {
157 *((u8 *)dest) = *((volatile u8 *)vsrc);
158 __asm__ __volatile__ ("eieio" : : : "memory");
164 *((u32 *)dest) = *((volatile u32 *)vsrc);
165 __asm__ __volatile__ ("eieio" : : : "memory");
171 *((u8 *)dest) = *((volatile u8 *)vsrc);
172 __asm__ __volatile__ ("eieio" : : : "memory");
177 __asm__ __volatile__ ("sync" : : : "memory");
179 EXPORT_SYMBOL(_memcpy_fromio);
181 void _memcpy_toio(volatile void __iomem *dest, const void *src, unsigned long n)
183 void *vdest = (void __force *) dest;
185 __asm__ __volatile__ ("sync" : : : "memory");
186 while(n && (!IO_CHECK_ALIGN(vdest, 4) || !IO_CHECK_ALIGN(src, 4))) {
187 *((volatile u8 *)vdest) = *((u8 *)src);
193 *((volatile u32 *)vdest) = *((volatile u32 *)src);
199 *((volatile u8 *)vdest) = *((u8 *)src);
204 __asm__ __volatile__ ("sync" : : : "memory");
206 EXPORT_SYMBOL(_memcpy_toio);