897cd717a5
work in progress and has never booted a real machine. Initial development and testing was done using SimOS (see http://simos.stanford.edu for details). On the SimOS simulator, this port successfully reaches single-user mode and has been tested with loads as high as one copy of /bin/ls :-). Obtained from: partly from NetBSD/alpha
156 lines
4.1 KiB
C
156 lines
4.1 KiB
C
/* $Id */
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/* $NetBSD: gbus.c,v 1.8 1998/05/13 22:13:35 thorpej Exp $ */
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/*
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* Copyright (c) 1997 by Matthew Jacob
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* NASA AMES Research Center.
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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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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* 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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Autoconfiguration and support routines for the Gbus: the internal
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* bus on AlphaServer CPU modules.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <machine/rpb.h>
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#include <machine/pte.h>
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#include <alpha/tlsb/gbusreg.h>
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#include <alpha/tlsb/gbusvar.h>
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#include <alpha/tlsb/tlsbreg.h>
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#include <alpha/tlsb/tlsbvar.h>
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extern int cputype;
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#define KV(_addr) ((caddr_t)ALPHA_PHYS_TO_K0SEG((_addr)))
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/*
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* The structure used to attach devices to the Gbus.
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*/
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struct gbus_device {
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const char* gd_name;
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int gd_offset;
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};
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#define DEVTOGBUS(dev) ((struct gbus_device*) device_get_ivars(dev))
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struct gbus_device gbus_children[] = {
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{ "zsc", GBUS_DUART0_OFFSET },
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/* { "zsc", GBUS_DUART1_OFFSET },*/
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{ "mcclock", GBUS_CLOCK_OFFSET },
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{ NULL, 0 },
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};
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static devclass_t gbus_devclass;
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/*
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* Bus handlers.
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*/
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static bus_print_device_t gbus_print_device;
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static bus_read_ivar_t gbus_read_ivar;
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static bus_ops_t gbus_bus_ops = {
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gbus_print_device,
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gbus_read_ivar,
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null_write_ivar,
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null_map_intr,
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};
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static void
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gbus_print_device(bus_t bus, device_t dev)
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{
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struct gbus_device* gdev = DEVTOGBUS(dev);
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device_t gbusdev = bus_get_device(bus);
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printf(" at %s%d offset 0x%lx",
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device_get_name(gbusdev), device_get_unit(gbusdev),
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gdev->gd_offset);
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}
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static int
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gbus_read_ivar(bus_t bus, device_t dev,
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int index, u_long* result)
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{
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struct gbus_device* gdev = DEVTOGBUS(dev);
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switch (index) {
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case GBUS_IVAR_OFFSET:
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*result = gdev->gd_offset;
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break;
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}
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return ENOENT;
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}
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static driver_probe_t gbus_bus_probe;
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static driver_t gbus_bus_driver = {
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"gbus",
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gbus_bus_probe,
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bus_generic_attach,
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bus_generic_detach,
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bus_generic_shutdown,
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DRIVER_TYPE_MISC,
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sizeof(struct bus),
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NULL,
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};
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/*
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* At 'probe' time, we add all the devices which we know about to the
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* bus. The generic attach routine will probe and attach them if they
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* are alive.
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*/
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static int
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gbus_bus_probe(bus_t parent, device_t dev)
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{
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bus_t bus = device_get_softc(dev);
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struct gbus_device *gdev;
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/*
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* Make sure we're looking for a Gbus.
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* Right now, only Gbus could be a
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* child of a TLSB CPU Node.
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*/
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if (!TLDEV_ISCPU(tlsb_get_dtype(dev)))
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return ENXIO;
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bus_init(bus, dev, &gbus_bus_ops);
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for (gdev = gbus_children; gdev->gd_name; gdev++)
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bus_add_device(bus, gdev->gd_name, -1, gdev);
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return 0;
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}
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DRIVER_MODULE(gbus, tlsb, gbus_bus_driver, gbus_devclass, 0, 0);
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