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 RISC-V 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 and I/O memory address space.
39 #include "opt_platform.h"
41 #include <sys/param.h>
42 #include <sys/systm.h>
44 #include <sys/kernel.h>
45 #include <sys/malloc.h>
46 #include <sys/module.h>
48 #include <sys/interrupt.h>
53 #include <machine/bus.h>
54 #include <machine/resource.h>
55 #include <machine/intr.h>
58 #include <dev/ofw/ofw_bus_subr.h>
59 #include <dev/ofw/openfirm.h>
60 #include "ofw_bus_if.h"
63 extern struct bus_space memmap_bus;
65 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
68 struct resource_list nx_resources;
71 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
73 static struct rman mem_rman;
74 static struct rman irq_rman;
76 static device_probe_t nexus_fdt_probe;
77 static device_attach_t nexus_attach;
79 static bus_add_child_t nexus_add_child;
80 static bus_print_child_t nexus_print_child;
82 static bus_activate_resource_t nexus_activate_resource;
83 static bus_alloc_resource_t nexus_alloc_resource;
84 static bus_deactivate_resource_t nexus_deactivate_resource;
85 static bus_get_resource_list_t nexus_get_reslist;
86 static bus_get_rman_t nexus_get_rman;
87 static bus_map_resource_t nexus_map_resource;
88 static bus_unmap_resource_t nexus_unmap_resource;
90 static bus_config_intr_t nexus_config_intr;
91 static bus_describe_intr_t nexus_describe_intr;
92 static bus_setup_intr_t nexus_setup_intr;
93 static bus_teardown_intr_t nexus_teardown_intr;
95 static bus_get_bus_tag_t nexus_get_bus_tag;
97 static ofw_bus_map_intr_t nexus_ofw_map_intr;
99 static device_method_t nexus_methods[] = {
100 /* Device interface */
101 DEVMETHOD(device_probe, nexus_fdt_probe),
102 DEVMETHOD(device_attach, nexus_attach),
105 DEVMETHOD(ofw_bus_map_intr, nexus_ofw_map_intr),
108 DEVMETHOD(bus_add_child, nexus_add_child),
109 DEVMETHOD(bus_print_child, nexus_print_child),
110 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
111 DEVMETHOD(bus_adjust_resource, bus_generic_rman_adjust_resource),
112 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
113 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
114 DEVMETHOD(bus_delete_resource, bus_generic_rl_delete_resource),
115 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
116 DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
117 DEVMETHOD(bus_get_rman, nexus_get_rman),
118 DEVMETHOD(bus_map_resource, nexus_map_resource),
119 DEVMETHOD(bus_release_resource, bus_generic_rman_release_resource),
120 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
121 DEVMETHOD(bus_unmap_resource, nexus_unmap_resource),
122 DEVMETHOD(bus_config_intr, nexus_config_intr),
123 DEVMETHOD(bus_describe_intr, nexus_describe_intr),
124 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
125 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
126 DEVMETHOD(bus_get_bus_tag, nexus_get_bus_tag),
131 static driver_t nexus_fdt_driver = {
137 EARLY_DRIVER_MODULE(nexus_fdt, root, nexus_fdt_driver, 0, 0,
138 BUS_PASS_BUS + BUS_PASS_ORDER_FIRST);
141 nexus_fdt_probe(device_t dev)
145 return (BUS_PROBE_DEFAULT);
149 nexus_attach(device_t dev)
152 mem_rman.rm_start = 0;
153 mem_rman.rm_end = BUS_SPACE_MAXADDR;
154 mem_rman.rm_type = RMAN_ARRAY;
155 mem_rman.rm_descr = "I/O memory addresses";
156 if (rman_init(&mem_rman) ||
157 rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR))
158 panic("nexus_attach mem_rman");
159 irq_rman.rm_start = 0;
160 irq_rman.rm_end = ~0;
161 irq_rman.rm_type = RMAN_ARRAY;
162 irq_rman.rm_descr = "Interrupts";
163 if (rman_init(&irq_rman) || rman_manage_region(&irq_rman, 0, ~0))
164 panic("nexus_attach irq_rman");
167 * Add direct children of nexus. Devices will be probed and attached
170 nexus_add_child(dev, 0, "timer", 0);
171 nexus_add_child(dev, 1, "rcons", 0);
172 nexus_add_child(dev, 2, "ofwbus", 0);
174 bus_generic_probe(dev);
175 bus_generic_attach(dev);
181 nexus_print_child(device_t bus, device_t child)
185 retval += bus_print_child_header(bus, child);
186 retval += printf("\n");
192 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
195 struct nexus_device *ndev;
197 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
200 resource_list_init(&ndev->nx_resources);
202 child = device_add_child_ordered(bus, order, name, unit);
204 device_set_ivars(child, ndev);
210 nexus_get_rman(device_t bus, int type, u_int flags)
225 * Allocate a resource on behalf of child. NB: child is usually going to be a
226 * child of one of our descendants, not a direct child of nexus0.
228 static struct resource *
229 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
230 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
232 struct nexus_device *ndev = DEVTONX(child);
233 struct resource_list_entry *rle;
236 * If this is an allocation of the "default" range for a given
237 * RID, and we know what the resources for this device are
238 * (ie. they aren't maintained by a child bus), then work out
239 * the start/end values.
241 if (RMAN_IS_DEFAULT_RANGE(start, end) && (count == 1)) {
242 if (device_get_parent(child) != bus || ndev == NULL)
244 rle = resource_list_find(&ndev->nx_resources, type, *rid);
252 return (bus_generic_rman_alloc_resource(bus, child, type, rid,
253 start, end, count, flags));
257 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
258 enum intr_polarity pol)
265 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
266 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
270 if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
273 /* We depend here on rman_activate_resource() being idempotent. */
274 error = rman_activate_resource(res);
278 error = intr_setup_irq(child, res, filt, intr, arg, flags, cookiep);
284 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
287 return (intr_teardown_irq(child, r, ih));
291 nexus_describe_intr(device_t dev, device_t child, struct resource *irq,
292 void *cookie, const char *descr)
295 return (intr_describe_irq(child, irq, cookie, descr));
298 static bus_space_tag_t
299 nexus_get_bus_tag(device_t bus __unused, device_t child __unused)
302 return (&memmap_bus);
306 nexus_activate_resource(device_t bus, device_t child, struct resource *r)
310 switch (rman_get_type(r)) {
313 error = bus_generic_rman_activate_resource(bus, child, r);
316 error = rman_activate_resource(r);
319 error = intr_activate_irq(child, r);
321 rman_deactivate_resource(r);
332 static struct resource_list *
333 nexus_get_reslist(device_t dev, device_t child)
335 struct nexus_device *ndev = DEVTONX(child);
337 return (&ndev->nx_resources);
341 nexus_deactivate_resource(device_t bus, device_t child, struct resource *r)
345 switch (rman_get_type(r)) {
348 error = bus_generic_rman_deactivate_resource(bus, child, r);
351 error = rman_deactivate_resource(r);
354 intr_deactivate_irq(child, r);
364 nexus_map_resource(device_t bus, device_t child, struct resource *r,
365 struct resource_map_request *argsp, struct resource_map *map)
367 struct resource_map_request args;
368 rman_res_t length, start;
371 /* Resources must be active to be mapped. */
372 if ((rman_get_flags(r) & RF_ACTIVE) == 0)
375 /* Mappings are only supported on I/O and memory resources. */
376 switch (rman_get_type(r)) {
384 resource_init_map_request(&args);
385 error = resource_validate_map_request(r, argsp, &args, &start, &length);
389 map->r_vaddr = pmap_mapdev(start, length);
390 map->r_bustag = &memmap_bus;
391 map->r_size = length;
394 * The handle is the virtual address.
396 map->r_bushandle = (bus_space_handle_t)map->r_vaddr;
401 nexus_unmap_resource(device_t bus, device_t child, struct resource *r,
402 struct resource_map *map)
404 switch (rman_get_type(r)) {
407 pmap_unmapdev(map->r_vaddr, map->r_size);
415 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
418 struct intr_map_data_fdt *fdt_data;
422 len = sizeof(*fdt_data) + icells * sizeof(pcell_t);
423 fdt_data = (struct intr_map_data_fdt *)intr_alloc_map_data(
424 INTR_MAP_DATA_FDT, len, M_WAITOK | M_ZERO);
425 fdt_data->iparent = iparent;
426 fdt_data->ncells = icells;
427 memcpy(fdt_data->cells, intr, icells * sizeof(pcell_t));
428 irq = intr_map_irq(NULL, iparent, (struct intr_map_data *)fdt_data);