Hardware Design: SIE
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| 1 | /* |
| 2 | * JZ47xx GPIO lines |
| 3 | * |
| 4 | * Written 2010 by Andres Calderon andres.calderon@emqbit.com |
| 5 | */ |
| 6 | |
| 7 | #include "jz47xx_mmap.h" |
| 8 | |
| 9 | unsigned int * |
| 10 | jz_mmap (off_t address) |
| 11 | { |
| 12 | int fd; |
| 13 | |
| 14 | unsigned int *pio; |
| 15 | |
| 16 | if ((fd = open ("/dev/mem", O_RDWR | O_SYNC)) == -1) |
| 17 | { |
| 18 | fprintf (stderr, "Cannot open /dev/mem.\n"); |
| 19 | return 0; |
| 20 | } |
| 21 | |
| 22 | pio = (unsigned int *) mmap (0, getpagesize (), PROT_READ | PROT_WRITE, MAP_SHARED, fd, address); |
| 23 | |
| 24 | if (pio == (unsigned int *) -1) |
| 25 | { |
| 26 | fprintf (stderr, "Cannot mmap.\n"); |
| 27 | return 0; |
| 28 | } |
| 29 | |
| 30 | return pio; |
| 31 | } |
| 32 | |
| 33 |
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