2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright 2002 by Peter Grehan. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * PSIM 'iobus' local bus. Should be set up in the device tree like:
35 * /iobus@0x80000000/name psim-iobus
37 * Code borrowed from various nexus.c and uninorth.c :-)
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/malloc.h>
44 #include <sys/module.h>
46 #include <machine/bus.h>
49 #include <dev/ofw/ofw_bus.h>
50 #include <dev/ofw/openfirm.h>
52 #include <machine/vmparam.h>
56 #include <machine/resource.h>
58 #include <powerpc/psim/iobusvar.h>
64 struct rman sc_mem_rman;
67 static MALLOC_DEFINE(M_IOBUS, "iobus", "iobus device information");
69 static int iobus_probe(device_t);
70 static int iobus_attach(device_t);
71 static int iobus_print_child(device_t dev, device_t child);
72 static void iobus_probe_nomatch(device_t, device_t);
73 static int iobus_read_ivar(device_t, device_t, int, uintptr_t *);
74 static int iobus_write_ivar(device_t, device_t, int, uintptr_t);
75 static struct resource *iobus_alloc_resource(device_t, device_t, int, int *,
76 rman_res_t, rman_res_t, rman_res_t,
78 static int iobus_activate_resource(device_t, device_t, int, int,
80 static int iobus_deactivate_resource(device_t, device_t, int, int,
82 static int iobus_release_resource(device_t, device_t, int, int,
86 * Bus interface definition
88 static device_method_t iobus_methods[] = {
89 /* Device interface */
90 DEVMETHOD(device_probe, iobus_probe),
91 DEVMETHOD(device_attach, iobus_attach),
92 DEVMETHOD(device_detach, bus_generic_detach),
93 DEVMETHOD(device_shutdown, bus_generic_shutdown),
94 DEVMETHOD(device_suspend, bus_generic_suspend),
95 DEVMETHOD(device_resume, bus_generic_resume),
98 DEVMETHOD(bus_print_child, iobus_print_child),
99 DEVMETHOD(bus_probe_nomatch, iobus_probe_nomatch),
100 DEVMETHOD(bus_read_ivar, iobus_read_ivar),
101 DEVMETHOD(bus_write_ivar, iobus_write_ivar),
102 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
103 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
105 DEVMETHOD(bus_alloc_resource, iobus_alloc_resource),
106 DEVMETHOD(bus_release_resource, iobus_release_resource),
107 DEVMETHOD(bus_activate_resource, iobus_activate_resource),
108 DEVMETHOD(bus_deactivate_resource, iobus_deactivate_resource),
112 static driver_t iobus_driver = {
115 sizeof(struct iobus_softc)
118 DRIVER_MODULE(iobus, ofwbus, iobus_driver, 0, 0);
121 iobus_probe(device_t dev)
123 const char *type = ofw_bus_get_name(dev);
125 if (strcmp(type, "psim-iobus") != 0)
128 device_set_desc(dev, "PSIM local bus");
133 * Add interrupt/addr range to the dev's resource list if present
136 iobus_add_intr(phandle_t devnode, struct iobus_devinfo *dinfo)
140 if (OF_getprop(devnode, "interrupt", &intr, sizeof(intr)) != -1) {
141 resource_list_add(&dinfo->id_resources,
142 SYS_RES_IRQ, 0, intr, intr, 1);
144 dinfo->id_interrupt = intr;
148 iobus_add_reg(phandle_t devnode, struct iobus_devinfo *dinfo,
149 vm_offset_t iobus_off)
154 size = OF_getprop(devnode, "reg", dinfo->id_reg,sizeof(dinfo->id_reg));
157 dinfo->id_nregs = size / (sizeof(dinfo->id_reg[0]));
159 for (i = 0; i < dinfo->id_nregs; i+= 3) {
161 * Scale the absolute addresses back to iobus
162 * relative offsets. This is to better simulate
165 dinfo->id_reg[i+1] -= iobus_off;
167 resource_list_add(&dinfo->id_resources,
178 iobus_attach(device_t dev)
180 struct iobus_softc *sc;
181 struct iobus_devinfo *dinfo;
189 sc = device_get_softc(dev);
190 sc->sc_node = ofw_bus_get_node(dev);
193 * Find the base addr/size of the iobus, and initialize the
196 size = OF_getprop(sc->sc_node, "reg", reg, sizeof(reg));
197 if (size == sizeof(reg)) {
198 sc->sc_addr = reg[0];
199 sc->sc_size = reg[1];
204 sc->sc_mem_rman.rm_type = RMAN_ARRAY;
205 sc->sc_mem_rman.rm_descr = "IOBus Device Memory";
206 if (rman_init(&sc->sc_mem_rman) != 0) {
208 "failed to init mem range resources\n");
211 rman_manage_region(&sc->sc_mem_rman, 0, sc->sc_size);
214 * Iterate through the sub-devices
218 for (child = OF_child(root); child != 0; child = OF_peer(child)) {
219 OF_getprop_alloc(child, "name", (void **)&name);
221 cdev = device_add_child(dev, NULL, -1);
223 dinfo = malloc(sizeof(*dinfo), M_IOBUS, M_WAITOK);
224 memset(dinfo, 0, sizeof(*dinfo));
225 resource_list_init(&dinfo->id_resources);
226 dinfo->id_node = child;
227 dinfo->id_name = name;
228 iobus_add_intr(child, dinfo);
229 iobus_add_reg(child, dinfo, sc->sc_addr);
230 device_set_ivars(cdev, dinfo);
236 return (bus_generic_attach(dev));
240 iobus_print_child(device_t dev, device_t child)
242 struct iobus_devinfo *dinfo;
243 struct resource_list *rl;
246 dinfo = device_get_ivars(child);
247 rl = &dinfo->id_resources;
249 retval += bus_print_child_header(dev, child);
251 retval += printf(" offset 0x%x", dinfo->id_reg[1]);
252 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%jd");
254 retval += bus_print_child_footer(dev, child);
260 iobus_probe_nomatch(device_t dev, device_t child)
265 iobus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
267 struct iobus_devinfo *dinfo;
269 if ((dinfo = device_get_ivars(child)) == NULL)
273 case IOBUS_IVAR_NODE:
274 *result = dinfo->id_node;
276 case IOBUS_IVAR_NAME:
277 *result = (uintptr_t)dinfo->id_name;
279 case IOBUS_IVAR_NREGS:
280 *result = dinfo->id_nregs;
282 case IOBUS_IVAR_REGS:
283 *result = (uintptr_t)dinfo->id_reg;
293 iobus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
298 static struct resource *
299 iobus_alloc_resource(device_t bus, device_t child, int type, int *rid,
300 rman_res_t start, rman_res_t end, rman_res_t count,
303 struct iobus_softc *sc;
308 sc = device_get_softc(bus);
310 needactivate = flags & RF_ACTIVE;
316 rm = &sc->sc_mem_rman;
319 return (bus_alloc_resource(bus, type, rid, start, end, count,
322 device_printf(bus, "unknown resource request from %s\n",
323 device_get_nameunit(child));
327 rv = rman_reserve_resource(rm, start, end, count, flags, child);
329 device_printf(bus, "failed to reserve resource for %s\n",
330 device_get_nameunit(child));
334 rman_set_rid(rv, *rid);
337 if (bus_activate_resource(child, type, *rid, rv) != 0) {
339 "failed to activate resource for %s\n",
340 device_get_nameunit(child));
341 rman_release_resource(rv);
350 iobus_release_resource(device_t bus, device_t child, int type, int rid,
351 struct resource *res)
353 if (rman_get_flags(res) & RF_ACTIVE) {
354 int error = bus_deactivate_resource(child, type, rid, res);
359 return (rman_release_resource(res));
363 iobus_activate_resource(device_t bus, device_t child, int type, int rid,
364 struct resource *res)
366 struct iobus_softc *sc;
369 sc = device_get_softc(bus);
371 if (type == SYS_RES_IRQ)
372 return (bus_activate_resource(bus, type, rid, res));
374 if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) {
375 p = pmap_mapdev((vm_paddr_t)rman_get_start(res) + sc->sc_addr,
376 (vm_size_t)rman_get_size(res));
379 rman_set_virtual(res, p);
380 rman_set_bustag(res, &bs_le_tag);
381 rman_set_bushandle(res, (u_long)p);
384 return (rman_activate_resource(res));
388 iobus_deactivate_resource(device_t bus, device_t child, int type, int rid,
389 struct resource *res)
392 * If this is a memory resource, unmap it.
394 if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) {
397 psize = rman_get_size(res);
398 pmap_unmapdev(rman_get_virtual(res), psize);
401 return (rman_deactivate_resource(res));