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| 1 | /* |
| 2 | * libubb/ubb.c - Open/close UBB |
| 3 | * |
| 4 | * Written 2012 by Werner Almesberger |
| 5 | * Copyright 2012 Werner Almesberger |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | |
| 14 | #include <stdint.h> |
| 15 | #include <unistd.h> |
| 16 | #include <fcntl.h> |
| 17 | #include <sys/mman.h> |
| 18 | |
| 19 | #include <ubb/ubb.h> |
| 20 | |
| 21 | |
| 22 | volatile void *ubb_mem; |
| 23 | |
| 24 | static int ubb_fd; |
| 25 | static uint32_t data, dir, pull, func, sel; |
| 26 | |
| 27 | |
| 28 | static void *map(off_t addr, size_t size, int *fd) |
| 29 | { |
| 30 | void *mem; |
| 31 | |
| 32 | *fd = open("/dev/mem", O_RDWR | O_SYNC); |
| 33 | if (*fd < 0) |
| 34 | return NULL; |
| 35 | mem = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, *fd, addr); |
| 36 | if (mem == MAP_FAILED) { |
| 37 | (void) close(*fd); |
| 38 | return NULL; |
| 39 | } |
| 40 | return mem; |
| 41 | } |
| 42 | |
| 43 | |
| 44 | int ubb_open(uint32_t keep) |
| 45 | { |
| 46 | ubb_mem = map(UBB_SOC_BASE, UBB_REG_WINDOW, &ubb_fd); |
| 47 | if (!ubb_mem) |
| 48 | return -1; |
| 49 | |
| 50 | data = PDDAT & UBB_ALL; |
| 51 | dir = PDDIR & UBB_ALL; |
| 52 | pull = PDPULL & UBB_ALL; |
| 53 | func = PDFUN & UBB_ALL; |
| 54 | sel = PDSEL & UBB_ALL; |
| 55 | |
| 56 | /* enable pull-ups to let card ramp up power */ |
| 57 | |
| 58 | PDPULLC = UBB_ALL_IO & ~keep; |
| 59 | PDDIRC = UBB_ALL_IO & ~keep; |
| 60 | |
| 61 | PDFUNC = UBB_ALL & ~keep; |
| 62 | PDSELC = UBB_ALL & ~keep; |
| 63 | |
| 64 | PDDATS = UBB_nPWR & ~keep; |
| 65 | PDDIRS = UBB_nPWR & ~keep; |
| 66 | |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | |
| 71 | void ubb_power(int on) |
| 72 | { |
| 73 | if (on) { |
| 74 | usleep(10*1000); |
| 75 | PDDATC = UBB_nPWR; |
| 76 | } else { |
| 77 | PDDATS = UBB_nPWR; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | |
| 82 | void ubb_close(uint32_t keep) |
| 83 | { |
| 84 | PDSELS = sel & ~keep; |
| 85 | PDFUNS = func & ~keep; |
| 86 | |
| 87 | PDDATS = (data | UBB_nPWR) & ~keep; |
| 88 | PDDIRS = (dir | UBB_nPWR) & ~keep; |
| 89 | |
| 90 | PDPULLS = pull & ~keep; |
| 91 | |
| 92 | close(ubb_fd); |
| 93 | } |
| 94 |
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