99d11cde56
* Eliminate bus_t and make it possible for all devices to have attached children. * Support dynamically extendable interfaces for drivers to replace both the function pointers in driver_t and bus_ops_t (which has been removed entirely. Two system defined interfaces have been defined, 'device' which is mandatory for all devices and 'bus' which is recommended for all devices which support attached children. * In addition, the alpha port defines two simple interfaces 'clock' for attaching various real time clocks to the system and 'mcclock' for the many different variations of mc146818 clocks which can be attached to different alpha platforms. This eliminates two more function pointer tables in favour of the generic method dispatch system provided by the device framework. Future device interfaces may include: * cdev and bdev interfaces for devfs to use in replacement for specfs and the fixed interfaces bdevsw and cdevsw. * scsi interface to replace struct scsi_adapter (not sure how this works in CAM but I imagine there is something similar there). * various tailored interfaces for different bus types such as pci, isa, pccard etc.
156 lines
4.3 KiB
C
156 lines
4.3 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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* Device methods
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*/
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static int gbus_probe(device_t dev);
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static void gbus_print_child(device_t dev, device_t child);
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static int gbus_read_ivar(device_t dev, device_t child, int which, u_long *result);;
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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_map_intr, bus_generic_map_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",
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gbus_methods,
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DRIVER_TYPE_MISC,
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1, /* no softc */
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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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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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for (gdev = gbus_children; gdev->gd_name; gdev++)
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device_add_child(dev, gdev->gd_name, -1, gdev);
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return 0;
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}
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static void
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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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printf(" at %s%d offset 0x%lx",
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device_get_name(bus), device_get_unit(bus),
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gdev->gd_offset);
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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, tlsb, gbus_driver, gbus_devclass, 0, 0);
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