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TOMOYO Linux Cross Reference
Linux/arch/arm64/kernel/io.c

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  1 /*
  2  * Based on arch/arm/kernel/io.c
  3  *
  4  * Copyright (C) 2012 ARM Ltd.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  * GNU General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 17  */
 18 
 19 #include <linux/export.h>
 20 #include <linux/types.h>
 21 #include <linux/io.h>
 22 
 23 /*
 24  * Copy data from IO memory space to "real" memory space.
 25  */
 26 void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
 27 {
 28         while (count && !IS_ALIGNED((unsigned long)from, 8)) {
 29                 *(u8 *)to = __raw_readb(from);
 30                 from++;
 31                 to++;
 32                 count--;
 33         }
 34 
 35         while (count >= 8) {
 36                 *(u64 *)to = __raw_readq(from);
 37                 from += 8;
 38                 to += 8;
 39                 count -= 8;
 40         }
 41 
 42         while (count) {
 43                 *(u8 *)to = __raw_readb(from);
 44                 from++;
 45                 to++;
 46                 count--;
 47         }
 48 }
 49 EXPORT_SYMBOL(__memcpy_fromio);
 50 
 51 /*
 52  * Copy data from "real" memory space to IO memory space.
 53  */
 54 void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
 55 {
 56         while (count && !IS_ALIGNED((unsigned long)to, 8)) {
 57                 __raw_writeb(*(u8 *)from, to);
 58                 from++;
 59                 to++;
 60                 count--;
 61         }
 62 
 63         while (count >= 8) {
 64                 __raw_writeq(*(u64 *)from, to);
 65                 from += 8;
 66                 to += 8;
 67                 count -= 8;
 68         }
 69 
 70         while (count) {
 71                 __raw_writeb(*(u8 *)from, to);
 72                 from++;
 73                 to++;
 74                 count--;
 75         }
 76 }
 77 EXPORT_SYMBOL(__memcpy_toio);
 78 
 79 /*
 80  * "memset" on IO memory space.
 81  */
 82 void __memset_io(volatile void __iomem *dst, int c, size_t count)
 83 {
 84         u64 qc = (u8)c;
 85 
 86         qc |= qc << 8;
 87         qc |= qc << 16;
 88         qc |= qc << 32;
 89 
 90         while (count && !IS_ALIGNED((unsigned long)dst, 8)) {
 91                 __raw_writeb(c, dst);
 92                 dst++;
 93                 count--;
 94         }
 95 
 96         while (count >= 8) {
 97                 __raw_writeq(qc, dst);
 98                 dst += 8;
 99                 count -= 8;
100         }
101 
102         while (count) {
103                 __raw_writeb(c, dst);
104                 dst++;
105                 count--;
106         }
107 }
108 EXPORT_SYMBOL(__memset_io);
109 

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