a4ec123c56
Parts of the z8530 driver were still using the SUN channel spacing. This was invalid on PowerMac and QEMU, where the attachment was to escc, not escc-legacy. This means the driver has apparently NEVER worked properly on Macintosh hardware. Add documentation for the channel spacing details, and change to using driver-specific initialization instead of hardcoded spacing so either spacing can be used. Fixes boot hang in QEMU when using the serial console, and fixes use on Xserve serial (and presumably PowerMacs that have a Stealth Serial port or similar) Reviewed by: jhibbits Sponsored by: Tag1 Consulting, Inc. Differential Revision: https://reviews.freebsd.org/D24661
97 lines
2.9 KiB
C
97 lines
2.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2006 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <dev/ofw/ofw_bus.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <machine/resource.h>
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#include <dev/scc/scc_bfe.h>
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#define MACIO_REGSHFT 4
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#define MACIO_RCLK 230400
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static int
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scc_macio_probe(device_t dev)
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{
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struct scc_softc *sc;
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const char *nm;
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sc = device_get_softc(dev);
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nm = ofw_bus_get_name(dev);
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/* Attach to modern escc (channel shift 4 bits) */
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if (!strcmp(nm, "escc")) {
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device_set_desc(dev, "Zilog Z8530 dual channel SCC");
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sc->sc_class = &scc_z8530_escc_class;
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return (scc_bfe_probe(dev, MACIO_REGSHFT, MACIO_RCLK, 0));
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}
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return (ENXIO);
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}
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static int
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scc_macio_attach(device_t dev)
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{
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return (scc_bfe_attach(dev, 3));
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}
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static device_method_t scc_macio_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, scc_macio_probe),
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DEVMETHOD(device_attach, scc_macio_attach),
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DEVMETHOD(device_detach, scc_bfe_detach),
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DEVMETHOD(bus_alloc_resource, scc_bus_alloc_resource),
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DEVMETHOD(bus_release_resource, scc_bus_release_resource),
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DEVMETHOD(bus_get_resource, scc_bus_get_resource),
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DEVMETHOD(bus_read_ivar, scc_bus_read_ivar),
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DEVMETHOD(bus_setup_intr, scc_bus_setup_intr),
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DEVMETHOD(bus_teardown_intr, scc_bus_teardown_intr),
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DEVMETHOD_END
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};
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static driver_t scc_macio_driver = {
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scc_driver_name,
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scc_macio_methods,
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sizeof(struct scc_softc),
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};
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DRIVER_MODULE(scc, macio, scc_macio_driver, scc_devclass, NULL, NULL);
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