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File: [local] / sys / dev / onewire / onewire_bitbang.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:14:13 2008 UTC (16 years, 4 months ago) by nbrk
Import of OpenBSD 4.2 release kernel tree with initial code to support Jornada 720/728, StrongARM 1110-based handheld PC. At this point kernel roots on NFS and boots into vfs_mountroot() and traps. What is supported: - glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode (needs some palette tweaks for non black/white/blue colors, i think) - saic, SA11x0 interrupt controller (needs cleanup) - sacom, SA11x0 UART (supported only as boot console for now) - SA11x0 GPIO controller fully supported (but can't handle multiple interrupt handlers on one gpio pin) - sassp, SSP port on SA11x0 that attaches spibus - Jornada microcontroller (jmcu) to control kbd, battery, etc throught the SPI bus (wskbd attaches on jmcu, but not tested) - tod functions seem work - initial code for SA-1111 (chip companion) : this is TODO Next important steps, i think: - gpio and intc on sa1111 - pcmcia support for sa11x0 (and sa1111 help logic) - REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs) - root on wd0! (using already supported PCMCIA-ATA) |
/* $OpenBSD: onewire_bitbang.c,v 1.1 2006/03/04 16:27:03 grange Exp $ */ /* * Copyright (c) 2006 Alexander Yurchenko <grange@openbsd.org> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* * 1-Wire bus bit-banging routines. */ #include <sys/param.h> #include <sys/systm.h> #include <sys/device.h> #include <dev/onewire/onewirevar.h> int onewire_bb_reset(const struct onewire_bbops *ops, void *arg) { int s, rv, i; s = splhigh(); ops->bb_tx(arg); ops->bb_set(arg, 0); DELAY(480); ops->bb_set(arg, 1); ops->bb_rx(arg); DELAY(30); for (i = 0; i < 6; i++) { if ((rv = ops->bb_get(arg)) == 0) break; DELAY(20); } DELAY(450); splx(s); return (rv); } int onewire_bb_bit(const struct onewire_bbops *ops, void *arg, int value) { int s, rv, i; s = splhigh(); ops->bb_tx(arg); ops->bb_set(arg, 0); DELAY(2); if (value) { ops->bb_set(arg, 1); ops->bb_rx(arg); for (i = 0; i < 15; i++) { if ((rv = ops->bb_get(arg)) == 0) break; DELAY(2); } ops->bb_tx(arg); } DELAY(60); ops->bb_set(arg, 1); DELAY(5); splx(s); return (rv); }