mirror of
git://projects.qi-hardware.com/ben-blinkenlights.git
synced 2024-11-19 06:56:16 +02:00
94 lines
1.6 KiB
C
94 lines
1.6 KiB
C
/*
|
|
* libubb/ubb.c - Open/close UBB
|
|
*
|
|
* Written 2012 by Werner Almesberger
|
|
* Copyright 2012 Werner Almesberger
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
|
|
#include <stdint.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <sys/mman.h>
|
|
|
|
#include <ubb/ubb.h>
|
|
|
|
|
|
volatile void *ubb_mem;
|
|
|
|
static int ubb_fd;
|
|
static uint32_t data, dir, pull, func, sel;
|
|
|
|
|
|
static void *map(off_t addr, size_t size, int *fd)
|
|
{
|
|
void *mem;
|
|
|
|
*fd = open("/dev/mem", O_RDWR | O_SYNC);
|
|
if (*fd < 0)
|
|
return NULL;
|
|
mem = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, *fd, addr);
|
|
if (mem == MAP_FAILED) {
|
|
(void) close(*fd);
|
|
return NULL;
|
|
}
|
|
return mem;
|
|
}
|
|
|
|
|
|
int ubb_open(uint32_t keep)
|
|
{
|
|
ubb_mem = map(UBB_SOC_BASE, UBB_REG_WINDOW, &ubb_fd);
|
|
if (!ubb_mem)
|
|
return -1;
|
|
|
|
data = PDDAT & UBB_ALL;
|
|
dir = PDDIR & UBB_ALL;
|
|
pull = PDPULL & UBB_ALL;
|
|
func = PDFUN & UBB_ALL;
|
|
sel = PDSEL & UBB_ALL;
|
|
|
|
/* enable pull-ups to let card ramp up power */
|
|
|
|
PDPULLC = UBB_ALL_IO & ~keep;
|
|
PDDIRC = UBB_ALL_IO & ~keep;
|
|
|
|
PDFUNC = UBB_ALL & ~keep;
|
|
PDSELC = UBB_ALL & ~keep;
|
|
|
|
PDDATS = UBB_nPWR & ~keep;
|
|
PDDIRS = UBB_nPWR & ~keep;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void ubb_power(int on)
|
|
{
|
|
if (on) {
|
|
usleep(10*1000);
|
|
PDDATC = UBB_nPWR;
|
|
} else {
|
|
PDDATS = UBB_nPWR;
|
|
}
|
|
}
|
|
|
|
|
|
void ubb_close(uint32_t keep)
|
|
{
|
|
PDSELS = sel & ~keep;
|
|
PDFUNS = func & ~keep;
|
|
|
|
PDDATS = (data | UBB_nPWR) & ~keep;
|
|
PDDIRS = (dir | UBB_nPWR) & ~keep;
|
|
|
|
PDPULLS = pull & ~keep;
|
|
|
|
close(ubb_fd);
|
|
}
|