157 lines
4.2 KiB
C
157 lines
4.2 KiB
C
/* $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, 2000 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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*
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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/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/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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{ "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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* Device methods
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*/
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static int gbus_probe(device_t);
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static int gbus_print_child(device_t, device_t);
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static int gbus_read_ivar(device_t, device_t, int, u_long *);
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static device_method_t gbus_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, gbus_probe),
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DEVMETHOD(device_attach, bus_generic_attach),
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DEVMETHOD(device_detach, bus_generic_detach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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/* Bus interface */
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DEVMETHOD(bus_print_child, gbus_print_child),
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DEVMETHOD(bus_read_ivar, gbus_read_ivar),
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DEVMETHOD(bus_write_ivar, bus_generic_write_ivar),
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DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
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DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
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{ 0, 0 }
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};
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static driver_t gbus_driver = {
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"gbus", gbus_methods, 1
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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_probe(device_t dev)
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{
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device_t child;
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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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* A Gbus can only be a child of a TLSB CPU Node.
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*/
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if (!TLDEV_ISCPU(tlsb_get_dtype(device_get_parent(dev)))) {
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return ENXIO;
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}
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for (gdev = gbus_children; gdev->gd_name; gdev++) {
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child = device_add_child(dev, gdev->gd_name, -1);
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device_set_ivars(child, gdev);
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}
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return (0);
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}
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static int
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gbus_print_child(device_t bus, device_t dev)
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{
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struct gbus_device* gdev = DEVTOGBUS(dev);
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int retval = 0;
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retval += bus_print_child_header(bus, dev);
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retval += printf(" on %s offset 0x%x\n", device_get_nameunit(bus),
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gdev->gd_offset);
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return (retval);
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}
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static int
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gbus_read_ivar(device_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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DRIVER_MODULE(gbus, tlsbcpu, gbus_driver, gbus_devclass, 0, 0);
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