2 * Copyright 1998 Massachusetts Institute of Technology
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission. M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * This code implements a `root nexus' for Arm Architecture
33 * machines. The function of the root nexus is to serve as an
34 * attachment point for both processors and buses, and to manage
35 * resources which are common to all of them. In particular,
36 * this code implements the core resource managers for interrupt
37 * requests, DMA requests (which rightfully should be a part of the
38 * ISA code but it's easier to do it here for now), I/O port addresses,
39 * and I/O memory address space.
42 #include "opt_platform.h"
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
47 #include <sys/param.h>
48 #include <sys/systm.h>
50 #include <sys/kernel.h>
51 #include <sys/malloc.h>
52 #include <sys/module.h>
53 #include <machine/bus.h>
55 #include <sys/interrupt.h>
57 #include <machine/vmparam.h>
58 #include <machine/pcb.h>
62 #include <machine/resource.h>
63 #include <machine/intr.h>
66 #include <machine/fdt.h>
67 #include "ofw_bus_if.h"
70 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
73 struct resource_list nx_resources;
76 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
78 static struct rman mem_rman;
80 static int nexus_probe(device_t);
81 static int nexus_attach(device_t);
82 static int nexus_print_child(device_t, device_t);
83 static device_t nexus_add_child(device_t, u_int, const char *, int);
84 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
85 u_long, u_long, u_long, u_int);
86 static int nexus_activate_resource(device_t, device_t, int, int,
88 static int nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
89 enum intr_polarity pol);
90 static int nexus_deactivate_resource(device_t, device_t, int, int,
92 static int nexus_release_resource(device_t, device_t, int, int,
95 static int nexus_setup_intr(device_t dev, device_t child, struct resource *res,
96 int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep);
97 static int nexus_teardown_intr(device_t, device_t, struct resource *, void *);
100 static int nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent,
101 int icells, pcell_t *intr);
104 static device_method_t nexus_methods[] = {
105 /* Device interface */
106 DEVMETHOD(device_probe, nexus_probe),
107 DEVMETHOD(device_attach, nexus_attach),
109 DEVMETHOD(bus_print_child, nexus_print_child),
110 DEVMETHOD(bus_add_child, nexus_add_child),
111 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
112 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
113 DEVMETHOD(bus_config_intr, nexus_config_intr),
114 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
115 DEVMETHOD(bus_release_resource, nexus_release_resource),
116 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
117 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
119 DEVMETHOD(ofw_bus_map_intr, nexus_ofw_map_intr),
124 static devclass_t nexus_devclass;
125 static driver_t nexus_driver = {
130 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0,
131 BUS_PASS_BUS + BUS_PASS_ORDER_EARLY);
134 nexus_probe(device_t dev)
137 device_quiet(dev); /* suppress attach message for neatness */
139 return (BUS_PROBE_DEFAULT);
143 nexus_attach(device_t dev)
146 mem_rman.rm_start = 0;
147 mem_rman.rm_end = ~0ul;
148 mem_rman.rm_type = RMAN_ARRAY;
149 mem_rman.rm_descr = "I/O memory addresses";
150 if (rman_init(&mem_rman) || rman_manage_region(&mem_rman, 0, ~0))
151 panic("nexus_probe mem_rman");
154 * First, deal with the children we know about already
156 bus_generic_probe(dev);
157 bus_generic_attach(dev);
163 nexus_print_child(device_t bus, device_t child)
167 retval += bus_print_child_header(bus, child);
168 retval += printf("\n");
174 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
177 struct nexus_device *ndev;
179 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
182 resource_list_init(&ndev->nx_resources);
184 child = device_add_child_ordered(bus, order, name, unit);
186 /* should we free this in nexus_child_detached? */
187 device_set_ivars(child, ndev);
194 * Allocate a resource on behalf of child. NB: child is usually going to be a
195 * child of one of our descendants, not a direct child of nexus0.
196 * (Exceptions include footbridge.)
198 static struct resource *
199 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
200 u_long start, u_long end, u_long count, u_int flags)
204 int needactivate = flags & RF_ACTIVE;
218 rv = rman_reserve_resource(rm, start, end, count, flags, child);
222 rman_set_rid(rv, *rid);
225 if (bus_activate_resource(child, type, *rid, rv)) {
226 rman_release_resource(rv);
235 nexus_release_resource(device_t bus, device_t child, int type, int rid,
236 struct resource *res)
240 if (rman_get_flags(res) & RF_ACTIVE) {
241 error = bus_deactivate_resource(child, type, rid, res);
245 return (rman_release_resource(res));
249 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
250 enum intr_polarity pol)
255 ret = (*arm_config_irq)(irq, trig, pol);
261 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
262 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
266 if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
269 for (irq = rman_get_start(res); irq <= rman_get_end(res); irq++) {
270 arm_setup_irqhandler(device_get_nameunit(child),
271 filt, intr, arg, irq, flags, cookiep);
278 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
281 return (arm_remove_irqhandler(rman_get_start(r), ih));
286 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
292 bus_space_handle_t vaddr;
294 if ((err = rman_activate_resource(r)) != 0)
298 * If this is a memory resource, map it into the kernel.
300 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
301 paddr = (bus_addr_t)rman_get_start(r);
302 psize = (bus_size_t)rman_get_size(r);
304 err = bus_space_map(fdtbus_bs_tag, paddr, psize, 0, &vaddr);
306 rman_deactivate_resource(r);
309 rman_set_bustag(r, fdtbus_bs_tag);
311 vaddr = (bus_space_handle_t)pmap_mapdev((vm_offset_t)paddr,
314 rman_deactivate_resource(r);
317 rman_set_bustag(r, (void *)1);
319 rman_set_virtual(r, (void *)vaddr);
320 rman_set_bushandle(r, vaddr);
326 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
330 bus_space_handle_t vaddr;
332 psize = (bus_size_t)rman_get_size(r);
333 vaddr = rman_get_bushandle(r);
337 bus_space_unmap(fdtbus_bs_tag, vaddr, psize);
339 pmap_unmapdev((vm_offset_t)vaddr, (vm_size_t)psize);
341 rman_set_virtual(r, NULL);
342 rman_set_bushandle(r, 0);
345 return (rman_deactivate_resource(r));
350 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
354 return (arm_fdt_map_irq(iparent, intr, icells));