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),
113 static driver_t iobus_driver = {
116 sizeof(struct iobus_softc)
119 devclass_t iobus_devclass;
121 DRIVER_MODULE(iobus, ofwbus, iobus_driver, iobus_devclass, 0, 0);
124 iobus_probe(device_t dev)
126 const char *type = ofw_bus_get_name(dev);
128 if (strcmp(type, "psim-iobus") != 0)
131 device_set_desc(dev, "PSIM local bus");
136 * Add interrupt/addr range to the dev's resource list if present
139 iobus_add_intr(phandle_t devnode, struct iobus_devinfo *dinfo)
143 if (OF_getprop(devnode, "interrupt", &intr, sizeof(intr)) != -1) {
144 resource_list_add(&dinfo->id_resources,
145 SYS_RES_IRQ, 0, intr, intr, 1);
147 dinfo->id_interrupt = intr;
152 iobus_add_reg(phandle_t devnode, struct iobus_devinfo *dinfo,
153 vm_offset_t iobus_off)
158 size = OF_getprop(devnode, "reg", dinfo->id_reg,sizeof(dinfo->id_reg));
161 dinfo->id_nregs = size / (sizeof(dinfo->id_reg[0]));
163 for (i = 0; i < dinfo->id_nregs; i+= 3) {
165 * Scale the absolute addresses back to iobus
166 * relative offsets. This is to better simulate
169 dinfo->id_reg[i+1] -= iobus_off;
171 resource_list_add(&dinfo->id_resources,
183 iobus_attach(device_t dev)
185 struct iobus_softc *sc;
186 struct iobus_devinfo *dinfo;
194 sc = device_get_softc(dev);
195 sc->sc_node = ofw_bus_get_node(dev);
198 * Find the base addr/size of the iobus, and initialize the
201 size = OF_getprop(sc->sc_node, "reg", reg, sizeof(reg));
202 if (size == sizeof(reg)) {
203 sc->sc_addr = reg[0];
204 sc->sc_size = reg[1];
209 sc->sc_mem_rman.rm_type = RMAN_ARRAY;
210 sc->sc_mem_rman.rm_descr = "IOBus Device Memory";
211 if (rman_init(&sc->sc_mem_rman) != 0) {
213 "failed to init mem range resources\n");
216 rman_manage_region(&sc->sc_mem_rman, 0, sc->sc_size);
219 * Iterate through the sub-devices
223 for (child = OF_child(root); child != 0; child = OF_peer(child)) {
224 OF_getprop_alloc(child, "name", (void **)&name);
226 cdev = device_add_child(dev, NULL, -1);
228 dinfo = malloc(sizeof(*dinfo), M_IOBUS, M_WAITOK);
229 memset(dinfo, 0, sizeof(*dinfo));
230 resource_list_init(&dinfo->id_resources);
231 dinfo->id_node = child;
232 dinfo->id_name = name;
233 iobus_add_intr(child, dinfo);
234 iobus_add_reg(child, dinfo, sc->sc_addr);
235 device_set_ivars(cdev, dinfo);
241 return (bus_generic_attach(dev));
246 iobus_print_child(device_t dev, device_t child)
248 struct iobus_devinfo *dinfo;
249 struct resource_list *rl;
252 dinfo = device_get_ivars(child);
253 rl = &dinfo->id_resources;
255 retval += bus_print_child_header(dev, child);
257 retval += printf(" offset 0x%x", dinfo->id_reg[1]);
258 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%jd");
260 retval += bus_print_child_footer(dev, child);
267 iobus_probe_nomatch(device_t dev, device_t child)
273 iobus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
275 struct iobus_devinfo *dinfo;
277 if ((dinfo = device_get_ivars(child)) == NULL)
281 case IOBUS_IVAR_NODE:
282 *result = dinfo->id_node;
284 case IOBUS_IVAR_NAME:
285 *result = (uintptr_t)dinfo->id_name;
287 case IOBUS_IVAR_NREGS:
288 *result = dinfo->id_nregs;
290 case IOBUS_IVAR_REGS:
291 *result = (uintptr_t)dinfo->id_reg;
302 iobus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
308 static struct resource *
309 iobus_alloc_resource(device_t bus, device_t child, int type, int *rid,
310 rman_res_t start, rman_res_t end, rman_res_t count,
313 struct iobus_softc *sc;
318 sc = device_get_softc(bus);
320 needactivate = flags & RF_ACTIVE;
326 rm = &sc->sc_mem_rman;
329 return (bus_alloc_resource(bus, type, rid, start, end, count,
332 device_printf(bus, "unknown resource request from %s\n",
333 device_get_nameunit(child));
337 rv = rman_reserve_resource(rm, start, end, count, flags, child);
339 device_printf(bus, "failed to reserve resource for %s\n",
340 device_get_nameunit(child));
344 rman_set_rid(rv, *rid);
347 if (bus_activate_resource(child, type, *rid, rv) != 0) {
349 "failed to activate resource for %s\n",
350 device_get_nameunit(child));
351 rman_release_resource(rv);
361 iobus_release_resource(device_t bus, device_t child, int type, int rid,
362 struct resource *res)
364 if (rman_get_flags(res) & RF_ACTIVE) {
365 int error = bus_deactivate_resource(child, type, rid, res);
370 return (rman_release_resource(res));
375 iobus_activate_resource(device_t bus, device_t child, int type, int rid,
376 struct resource *res)
378 struct iobus_softc *sc;
381 sc = device_get_softc(bus);
383 if (type == SYS_RES_IRQ)
384 return (bus_activate_resource(bus, type, rid, res));
386 if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) {
387 p = pmap_mapdev((vm_offset_t)rman_get_start(res) + sc->sc_addr,
388 (vm_size_t)rman_get_size(res));
391 rman_set_virtual(res, p);
392 rman_set_bustag(res, &bs_le_tag);
393 rman_set_bushandle(res, (u_long)p);
396 return (rman_activate_resource(res));
401 iobus_deactivate_resource(device_t bus, device_t child, int type, int rid,
402 struct resource *res)
405 * If this is a memory resource, unmap it.
407 if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) {
410 psize = rman_get_size(res);
411 pmap_unmapdev((vm_offset_t)rman_get_virtual(res), psize);
414 return (rman_deactivate_resource(res));