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git://projects.qi-hardware.com/ben-blinkenlights.git
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94 lines
1.6 KiB
C
94 lines
1.6 KiB
C
/*
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* libubb/ubb.c - Open/close UBB
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*
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* Written 2012 by Werner Almesberger
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* Copyright 2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdint.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <ubb/ubb.h>
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volatile void *ubb_mem;
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static int ubb_fd;
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static uint32_t data, dir, pull, func, sel;
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static void *map(off_t addr, size_t size, int *fd)
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{
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void *mem;
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*fd = open("/dev/mem", O_RDWR | O_SYNC);
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if (*fd < 0)
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return NULL;
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mem = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, *fd, addr);
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if (mem == MAP_FAILED) {
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(void) close(*fd);
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return NULL;
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}
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return mem;
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}
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int ubb_open(uint32_t keep)
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{
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ubb_mem = map(UBB_SOC_BASE, UBB_REG_WINDOW, &ubb_fd);
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if (!ubb_mem)
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return -1;
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data = PDDAT & UBB_ALL;
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dir = PDDIR & UBB_ALL;
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pull = PDPULL & UBB_ALL;
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func = PDFUN & UBB_ALL;
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sel = PDSEL & UBB_ALL;
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/* enable pull-ups to let card ramp up power */
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PDPULLC = UBB_ALL_IO & ~keep;
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PDDIRC = UBB_ALL_IO & ~keep;
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PDFUNC = UBB_ALL & ~keep;
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PDSELC = UBB_ALL & ~keep;
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PDDATS = UBB_nPWR & ~keep;
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PDDIRS = UBB_nPWR & ~keep;
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return 0;
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}
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void ubb_power(int on)
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{
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if (on) {
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usleep(10*1000);
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PDDATC = UBB_nPWR;
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} else {
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PDDATS = UBB_nPWR;
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}
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}
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void ubb_close(uint32_t keep)
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{
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PDSELS = sel & ~keep;
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PDFUNS = func & ~keep;
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PDDATS = (data | UBB_nPWR) & ~keep;
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PDDIRS = (dir | UBB_nPWR) & ~keep;
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PDPULLS = pull & ~keep;
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close(ubb_fd);
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}
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