408 lines
11 KiB
C
408 lines
11 KiB
C
/*
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* Copyright 2002 by Peter Grehan. 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, 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 ``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,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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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* $FreeBSD$
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*/
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/*
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* PSIM 'iobus' local bus. Should be set up in the device tree like:
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*
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* /iobus@0x80000000/name psim-iobus
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*
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* Code borrowed from various nexus.c and uninorth.c :-)
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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/malloc.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <dev/ofw/openfirm.h>
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#include <machine/vmparam.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/pmap.h>
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#include <machine/resource.h>
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#include <machine/nexusvar.h>
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#include <powerpc/psim/iobusvar.h>
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static MALLOC_DEFINE(M_IOBUS, "iobus", "iobus device information");
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static int iobus_probe(device_t);
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static int iobus_attach(device_t);
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static int iobus_print_child(device_t dev, device_t child);
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static void iobus_probe_nomatch(device_t, device_t);
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static int iobus_read_ivar(device_t, device_t, int, uintptr_t *);
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static int iobus_write_ivar(device_t, device_t, int, uintptr_t);
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static struct resource *iobus_alloc_resource(device_t, device_t, int, int *,
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u_long, u_long, u_long, u_int);
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static int iobus_activate_resource(device_t, device_t, int, int,
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struct resource *);
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static int iobus_deactivate_resource(device_t, device_t, int, int,
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struct resource *);
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static int iobus_release_resource(device_t, device_t, int, int,
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struct resource *);
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/*
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* Bus interface definition
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*/
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static device_method_t iobus_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, iobus_probe),
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DEVMETHOD(device_attach, iobus_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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DEVMETHOD(device_suspend, bus_generic_suspend),
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DEVMETHOD(device_resume, bus_generic_resume),
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/* Bus interface */
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DEVMETHOD(bus_print_child, iobus_print_child),
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DEVMETHOD(bus_probe_nomatch, iobus_probe_nomatch),
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DEVMETHOD(bus_read_ivar, iobus_read_ivar),
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DEVMETHOD(bus_write_ivar, iobus_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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DEVMETHOD(bus_alloc_resource, iobus_alloc_resource),
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DEVMETHOD(bus_release_resource, iobus_release_resource),
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DEVMETHOD(bus_activate_resource, iobus_activate_resource),
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DEVMETHOD(bus_deactivate_resource, iobus_deactivate_resource),
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{ 0, 0 }
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};
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static driver_t iobus_driver = {
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"iobus",
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iobus_methods,
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sizeof(struct iobus_softc)
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};
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devclass_t iobus_devclass;
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DRIVER_MODULE(iobus, nexus, iobus_driver, iobus_devclass, 0, 0);
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static int
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iobus_probe(device_t dev)
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{
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char *type = nexus_get_name(dev);
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if (strcmp(type, "psim-iobus") != 0)
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return (ENXIO);
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device_set_desc(dev, "PSIM local bus");
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return (0);
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}
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/*
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* Add interrupt/addr range to the dev's resource list if present
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*/
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static void
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iobus_add_intr(phandle_t devnode, struct iobus_devinfo *dinfo)
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{
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u_int intr = -1;
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if (OF_getprop(devnode, "interrupt", &intr, sizeof(intr)) != -1) {
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resource_list_add(&dinfo->id_resources,
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SYS_RES_IRQ, 0, intr, intr, 1);
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}
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dinfo->id_interrupt = intr;
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}
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static void
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iobus_add_reg(phandle_t devnode, struct iobus_devinfo *dinfo,
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vm_offset_t iobus_off)
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{
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u_int size;
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int i;
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size = OF_getprop(devnode, "reg", dinfo->id_reg,sizeof(dinfo->id_reg));
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if (size != -1) {
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dinfo->id_nregs = size / (sizeof(dinfo->id_reg[0]));
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for (i = 0; i < dinfo->id_nregs; i+= 3) {
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/*
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* Scale the absolute addresses back to iobus
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* relative offsets. This is to better simulate
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* macio
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*/
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dinfo->id_reg[i+1] -= iobus_off;
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resource_list_add(&dinfo->id_resources,
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SYS_RES_MEMORY, 0,
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dinfo->id_reg[i+1],
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dinfo->id_reg[i+1] +
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dinfo->id_reg[i+2],
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dinfo->id_reg[i+2]);
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}
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}
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}
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static int
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iobus_attach(device_t dev)
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{
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struct iobus_softc *sc;
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struct iobus_devinfo *dinfo;
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phandle_t root;
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phandle_t child;
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device_t cdev;
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char *name;
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u_int reg[2];
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int size;
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sc = device_get_softc(dev);
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sc->sc_node = nexus_get_node(dev);
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/*
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* Find the base addr/size of the iobus, and initialize the
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* resource manager
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*/
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size = OF_getprop(sc->sc_node, "reg", reg, sizeof(reg));
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if (size == sizeof(reg)) {
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sc->sc_addr = reg[0];
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sc->sc_size = reg[1];
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} else {
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return (ENXIO);
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}
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sc->sc_mem_rman.rm_type = RMAN_ARRAY;
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sc->sc_mem_rman.rm_descr = "IOBus Device Memory";
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if (rman_init(&sc->sc_mem_rman) != 0) {
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device_printf(dev,
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"failed to init mem range resources\n");
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return (ENXIO);
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}
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rman_manage_region(&sc->sc_mem_rman, 0, sc->sc_size);
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/*
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* Iterate through the sub-devices
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*/
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root = sc->sc_node;
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for (child = OF_child(root); child != 0; child = OF_peer(child)) {
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OF_getprop_alloc(child, "name", 1, (void **)&name);
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cdev = device_add_child(dev, NULL, -1);
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if (cdev != NULL) {
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dinfo = malloc(sizeof(*dinfo), M_IOBUS, M_WAITOK);
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memset(dinfo, 0, sizeof(*dinfo));
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resource_list_init(&dinfo->id_resources);
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dinfo->id_node = child;
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dinfo->id_name = name;
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iobus_add_intr(child, dinfo);
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iobus_add_reg(child, dinfo, sc->sc_addr);
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device_set_ivars(cdev, dinfo);
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} else {
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free(name, M_OFWPROP);
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}
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}
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return (bus_generic_attach(dev));
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}
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static int
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iobus_print_child(device_t dev, device_t child)
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{
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struct iobus_devinfo *dinfo;
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struct resource_list *rl;
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int retval = 0;
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dinfo = device_get_ivars(child);
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rl = &dinfo->id_resources;
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retval += bus_print_child_header(dev, child);
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retval += printf(" offset 0x%x", dinfo->id_reg[1]);
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retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
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retval += bus_print_child_footer(dev, child);
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return (retval);
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}
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static void
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iobus_probe_nomatch(device_t dev, device_t child)
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{
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}
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static int
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iobus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
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{
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struct iobus_devinfo *dinfo;
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if ((dinfo = device_get_ivars(child)) == 0)
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return (ENOENT);
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switch (which) {
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case IOBUS_IVAR_NODE:
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*result = dinfo->id_node;
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break;
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case IOBUS_IVAR_NAME:
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*result = (uintptr_t)dinfo->id_name;
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break;
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case IOBUS_IVAR_NREGS:
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*result = dinfo->id_nregs;
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break;
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case IOBUS_IVAR_REGS:
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*result = (uintptr_t)dinfo->id_reg;
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break;
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default:
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return (ENOENT);
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}
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return (0);
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}
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static int
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iobus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
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{
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return (EINVAL);
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}
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static struct resource *
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iobus_alloc_resource(device_t bus, device_t child, int type, int *rid,
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u_long start, u_long end, u_long count, u_int flags)
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{
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struct iobus_softc *sc;
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int needactivate;
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struct resource *rv;
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struct rman *rm;
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bus_space_tag_t tagval;
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sc = device_get_softc(bus);
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needactivate = flags & RF_ACTIVE;
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flags &= ~RF_ACTIVE;
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switch (type) {
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case SYS_RES_MEMORY:
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case SYS_RES_IOPORT:
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rm = &sc->sc_mem_rman;
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tagval = PPC_BUS_SPACE_MEM;
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break;
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case SYS_RES_IRQ:
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return (bus_alloc_resource(bus, type, rid, start, end, count,
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flags));
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break;
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default:
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device_printf(bus, "unknown resource request from %s\n",
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device_get_nameunit(child));
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return (NULL);
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}
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rv = rman_reserve_resource(rm, start, end, count, flags, child);
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if (rv == NULL) {
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device_printf(bus, "failed to reserve resource for %s\n",
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device_get_nameunit(child));
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return (NULL);
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}
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rman_set_bustag(rv, tagval);
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rman_set_bushandle(rv, rman_get_start(rv));
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if (needactivate) {
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if (bus_activate_resource(child, type, *rid, rv) != 0) {
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device_printf(bus,
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"failed to activate resource for %s\n",
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device_get_nameunit(child));
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rman_release_resource(rv);
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return (NULL);
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}
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}
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return (rv);
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}
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static int
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iobus_release_resource(device_t bus, device_t child, int type, int rid,
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struct resource *res)
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{
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if (rman_get_flags(res) & RF_ACTIVE) {
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int error = bus_deactivate_resource(child, type, rid, res);
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if (error)
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return error;
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}
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return (rman_release_resource(res));
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}
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static int
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iobus_activate_resource(device_t bus, device_t child, int type, int rid,
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struct resource *res)
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{
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struct iobus_softc *sc;
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void *p;
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sc = device_get_softc(bus);
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if (type == SYS_RES_IRQ)
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return (bus_activate_resource(bus, type, rid, res));
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if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) {
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p = pmap_mapdev((vm_offset_t)rman_get_start(res) + sc->sc_addr,
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(vm_size_t)rman_get_size(res));
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if (p == NULL)
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return (ENOMEM);
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rman_set_virtual(res, p);
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rman_set_bushandle(res, (u_long)p);
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}
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return (rman_activate_resource(res));
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}
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static int
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iobus_deactivate_resource(device_t bus, device_t child, int type, int rid,
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struct resource *res)
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{
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/*
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* If this is a memory resource, unmap it.
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*/
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if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) {
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u_int32_t psize;
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psize = rman_get_size(res);
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pmap_unmapdev((vm_offset_t)rman_get_virtual(res), psize);
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}
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return (rman_deactivate_resource(res));
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}
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