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 <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
45 #include <sys/param.h>
46 #include <sys/systm.h>
48 #include <sys/kernel.h>
49 #include <sys/malloc.h>
50 #include <sys/module.h>
51 #include <machine/bus.h>
53 #include <sys/interrupt.h>
55 #include <machine/vmparam.h>
56 #include <machine/pcb.h>
60 #include <machine/resource.h>
61 #include <machine/intr.h>
63 #include "opt_platform.h"
66 #include <dev/fdt/fdt_common.h>
67 #include <machine/fdt.h>
68 #include "ofw_bus_if.h"
71 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
74 struct resource_list nx_resources;
77 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
79 static struct rman mem_rman;
81 static int nexus_probe(device_t);
82 static int nexus_attach(device_t);
83 static int nexus_print_child(device_t, device_t);
84 static device_t nexus_add_child(device_t, u_int, const char *, int);
85 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
86 u_long, u_long, u_long, u_int);
87 static int nexus_activate_resource(device_t, device_t, int, int,
89 static int nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
90 enum intr_polarity pol);
91 static int nexus_deactivate_resource(device_t, device_t, int, int,
94 static int nexus_setup_intr(device_t dev, device_t child, struct resource *res,
95 int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep);
96 static int nexus_teardown_intr(device_t, device_t, struct resource *, void *);
99 static int nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent,
100 int icells, pcell_t *intr);
103 static device_method_t nexus_methods[] = {
104 /* Device interface */
105 DEVMETHOD(device_probe, nexus_probe),
106 DEVMETHOD(device_attach, nexus_attach),
108 DEVMETHOD(bus_print_child, nexus_print_child),
109 DEVMETHOD(bus_add_child, nexus_add_child),
110 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
111 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
112 DEVMETHOD(bus_config_intr, nexus_config_intr),
113 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
114 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
115 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
117 DEVMETHOD(ofw_bus_map_intr, nexus_ofw_map_intr),
122 static devclass_t nexus_devclass;
123 static driver_t nexus_driver = {
128 #ifdef ARM_DEVICE_MULTIPASS
129 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0,
130 BUS_PASS_BUS + BUS_PASS_ORDER_EARLY);
132 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
136 nexus_probe(device_t dev)
139 device_quiet(dev); /* suppress attach message for neatness */
141 return (BUS_PROBE_DEFAULT);
145 nexus_attach(device_t dev)
148 mem_rman.rm_start = 0;
149 mem_rman.rm_end = ~0ul;
150 mem_rman.rm_type = RMAN_ARRAY;
151 mem_rman.rm_descr = "I/O memory addresses";
152 if (rman_init(&mem_rman) || rman_manage_region(&mem_rman, 0, ~0))
153 panic("nexus_probe mem_rman");
156 * First, deal with the children we know about already
158 bus_generic_probe(dev);
159 bus_generic_attach(dev);
165 nexus_print_child(device_t bus, device_t child)
169 retval += bus_print_child_header(bus, child);
170 retval += printf("\n");
176 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
179 struct nexus_device *ndev;
181 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
184 resource_list_init(&ndev->nx_resources);
186 child = device_add_child_ordered(bus, order, name, unit);
188 /* should we free this in nexus_child_detached? */
189 device_set_ivars(child, ndev);
196 * Allocate a resource on behalf of child. NB: child is usually going to be a
197 * child of one of our descendants, not a direct child of nexus0.
198 * (Exceptions include footbridge.)
200 static struct resource *
201 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
202 u_long start, u_long end, u_long count, u_int flags)
206 int needactivate = flags & RF_ACTIVE;
218 rv = rman_reserve_resource(rm, start, end, count, flags, child);
222 rman_set_rid(rv, *rid);
223 rman_set_bushandle(rv, rman_get_start(rv));
226 if (bus_activate_resource(child, type, *rid, rv)) {
227 rman_release_resource(rv);
236 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
237 enum intr_polarity pol)
242 ret = (*arm_config_irq)(irq, trig, pol);
248 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
249 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
253 if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
256 for (irq = rman_get_start(res); irq <= rman_get_end(res); irq++) {
257 arm_setup_irqhandler(device_get_nameunit(child),
258 filt, intr, arg, irq, flags, cookiep);
265 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
268 return (arm_remove_irqhandler(rman_get_start(r), ih));
273 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
279 bus_space_handle_t vaddr;
281 if ((err = rman_activate_resource(r)) != 0)
285 * If this is a memory resource, map it into the kernel.
287 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
288 paddr = (bus_addr_t)rman_get_start(r);
289 psize = (bus_size_t)rman_get_size(r);
291 err = bus_space_map(fdtbus_bs_tag, paddr, psize, 0, &vaddr);
293 rman_deactivate_resource(r);
296 rman_set_bustag(r, fdtbus_bs_tag);
298 vaddr = (bus_space_handle_t)pmap_mapdev((vm_offset_t)paddr,
301 rman_deactivate_resource(r);
304 rman_set_bustag(r, (void *)1);
306 rman_set_virtual(r, (void *)vaddr);
307 rman_set_bushandle(r, vaddr);
313 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
317 bus_space_handle_t vaddr;
319 psize = (bus_size_t)rman_get_size(r);
320 vaddr = rman_get_bushandle(r);
324 bus_space_unmap(fdtbus_bs_tag, vaddr, psize);
326 pmap_unmapdev((vm_offset_t)vaddr, (vm_size_t)psize);
328 rman_set_virtual(r, NULL);
329 rman_set_bushandle(r, 0);
332 return (rman_deactivate_resource(r));
337 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
340 fdt_pic_decode_t intr_decode;
341 phandle_t intr_offset;
342 int i, rv, interrupt, trig, pol;
344 intr_offset = OF_xref_phandle(iparent);
345 for (i = 0; i < icells; i++)
346 intr[i] = cpu_to_fdt32(intr[i]);
348 for (i = 0; fdt_pic_table[i] != NULL; i++) {
349 intr_decode = fdt_pic_table[i];
350 rv = intr_decode(intr_offset, intr, &interrupt, &trig, &pol);
353 /* This was recognized as our PIC and decoded. */
354 interrupt = FDT_MAP_IRQ(intr_parent, interrupt);
359 /* Not in table, so guess */
360 interrupt = FDT_MAP_IRQ(intr_parent, fdt32_to_cpu(intr[0]));