1 /*-
2 * Copyright 1998 Massachusetts Institute of Technology
3 *
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
14 * warranty.
15 *
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
27 * SUCH DAMAGE.
28 *
29 */
30
31 /*
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.
38 */
39 #include "opt_platform.h"
40
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/bus.h>
47 #include <sys/kernel.h>
48 #include <sys/malloc.h>
49 #include <sys/module.h>
50 #include <sys/rman.h>
51 #include <sys/interrupt.h>
52
53 #include <vm/vm.h>
54 #include <vm/pmap.h>
55
56 #include <machine/bus.h>
57 #include <machine/resource.h>
58 #include <machine/intr.h>
59
60 #ifdef FDT
61 #include <dev/ofw/ofw_bus_subr.h>
62 #include <dev/ofw/openfirm.h>
63 #include "ofw_bus_if.h"
64 #endif
65
66 extern struct bus_space memmap_bus;
67
68 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
69
70 struct nexus_device {
71 struct resource_list nx_resources;
72 };
73
74 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
75
76 static struct rman mem_rman;
77 static struct rman irq_rman;
78
79 static device_probe_t nexus_fdt_probe;
80 static int nexus_attach(device_t);
81
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 rman_res_t, rman_res_t, rman_res_t, u_int);
86 static int nexus_activate_resource(device_t, device_t, int, int,
87 struct resource *);
88 static int nexus_map_resource(device_t, device_t, int, struct resource *,
89 struct resource_map_request *, struct resource_map *);
90 static int nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
91 enum intr_polarity pol);
92 static struct resource_list *nexus_get_reslist(device_t, device_t);
93 static int nexus_set_resource(device_t, device_t, int, int,
94 rman_res_t, rman_res_t);
95 static int nexus_deactivate_resource(device_t, device_t, int, int,
96 struct resource *);
97 static int nexus_release_resource(device_t, device_t, int, int,
98 struct resource *);
99
100 static int nexus_setup_intr(device_t dev, device_t child, struct resource *res,
101 int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep);
102 static int nexus_teardown_intr(device_t, device_t, struct resource *, void *);
103 static bus_space_tag_t nexus_get_bus_tag(device_t, device_t);
104
105 static int nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent,
106 int icells, pcell_t *intr);
107
108 static device_method_t nexus_methods[] = {
109 /* Device interface */
110 DEVMETHOD(device_probe, nexus_fdt_probe),
111 DEVMETHOD(device_attach, nexus_attach),
112
113 /* OFW interface */
114 DEVMETHOD(ofw_bus_map_intr, nexus_ofw_map_intr),
115
116 /* Bus interface */
117 DEVMETHOD(bus_print_child, nexus_print_child),
118 DEVMETHOD(bus_add_child, nexus_add_child),
119 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
120 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
121 DEVMETHOD(bus_map_resource, nexus_map_resource),
122 DEVMETHOD(bus_config_intr, nexus_config_intr),
123 DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
124 DEVMETHOD(bus_set_resource, nexus_set_resource),
125 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
126 DEVMETHOD(bus_release_resource, nexus_release_resource),
127 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
128 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
129 DEVMETHOD(bus_get_bus_tag, nexus_get_bus_tag),
130 { 0, 0 }
131 };
132
133 static driver_t nexus_fdt_driver = {
134 "nexus",
135 nexus_methods,
136 1 /* no softc */
137 };
138
139 static int
140 nexus_fdt_probe(device_t dev)
141 {
142
143 device_quiet(dev);
144 return (BUS_PROBE_DEFAULT);
145 }
146
147 static int
148 nexus_attach(device_t dev)
149 {
150
151 mem_rman.rm_start = 0;
152 mem_rman.rm_end = BUS_SPACE_MAXADDR;
153 mem_rman.rm_type = RMAN_ARRAY;
154 mem_rman.rm_descr = "I/O memory addresses";
155 if (rman_init(&mem_rman) ||
156 rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR))
157 panic("nexus_attach mem_rman");
158 irq_rman.rm_start = 0;
159 irq_rman.rm_end = ~0;
160 irq_rman.rm_type = RMAN_ARRAY;
161 irq_rman.rm_descr = "Interrupts";
162 if (rman_init(&irq_rman) || rman_manage_region(&irq_rman, 0, ~0))
163 panic("nexus_attach irq_rman");
164
165 nexus_add_child(dev, 8, "timer", 0);
166 nexus_add_child(dev, 9, "rcons", 0);
167 nexus_add_child(dev, 10, "ofwbus", 0);
168
169 bus_generic_probe(dev);
170 bus_generic_attach(dev);
171
172 return (0);
173 }
174
175 static int
176 nexus_print_child(device_t bus, device_t child)
177 {
178 int retval = 0;
179
180 retval += bus_print_child_header(bus, child);
181 retval += printf("\n");
182
183 return (retval);
184 }
185
186 static device_t
187 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
188 {
189 device_t child;
190 struct nexus_device *ndev;
191
192 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
193 if (!ndev)
194 return (0);
195 resource_list_init(&ndev->nx_resources);
196
197 child = device_add_child_ordered(bus, order, name, unit);
198
199 /* should we free this in nexus_child_detached? */
200 device_set_ivars(child, ndev);
201
202 return (child);
203 }
204
205 /*
206 * Allocate a resource on behalf of child. NB: child is usually going to be a
207 * child of one of our descendants, not a direct child of nexus0.
208 * (Exceptions include footbridge.)
209 */
210 static struct resource *
211 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
212 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
213 {
214 struct nexus_device *ndev = DEVTONX(child);
215 struct resource *rv;
216 struct resource_list_entry *rle;
217 struct rman *rm;
218 int needactivate = flags & RF_ACTIVE;
219
220 /*
221 * If this is an allocation of the "default" range for a given
222 * RID, and we know what the resources for this device are
223 * (ie. they aren't maintained by a child bus), then work out
224 * the start/end values.
225 */
226 if (RMAN_IS_DEFAULT_RANGE(start, end) && (count == 1)) {
227 if (device_get_parent(child) != bus || ndev == NULL)
228 return(NULL);
229 rle = resource_list_find(&ndev->nx_resources, type, *rid);
230 if (rle == NULL)
231 return(NULL);
232 start = rle->start;
233 end = rle->end;
234 count = rle->count;
235 }
236
237 switch (type) {
238 case SYS_RES_IRQ:
239 rm = &irq_rman;
240 break;
241
242 case SYS_RES_MEMORY:
243 case SYS_RES_IOPORT:
244 rm = &mem_rman;
245 break;
246
247 default:
248 return (NULL);
249 }
250
251 rv = rman_reserve_resource(rm, start, end, count, flags, child);
252 if (rv == NULL)
253 return (NULL);
254
255 rman_set_rid(rv, *rid);
256 rman_set_bushandle(rv, rman_get_start(rv));
257
258 if (needactivate) {
259 if (bus_activate_resource(child, type, *rid, rv)) {
260 rman_release_resource(rv);
261 return (NULL);
262 }
263 }
264
265 return (rv);
266 }
267
268 static int
269 nexus_release_resource(device_t bus, device_t child, int type, int rid,
270 struct resource *res)
271 {
272 int error;
273
274 if (rman_get_flags(res) & RF_ACTIVE) {
275 error = bus_deactivate_resource(child, type, rid, res);
276 if (error)
277 return (error);
278 }
279 return (rman_release_resource(res));
280 }
281
282 static int
283 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
284 enum intr_polarity pol)
285 {
286
287 return (EOPNOTSUPP);
288 }
289
290 static int
291 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
292 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
293 {
294 int error;
295
296 if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
297 flags |= INTR_EXCL;
298
299 /* We depend here on rman_activate_resource() being idempotent. */
300 error = rman_activate_resource(res);
301 if (error)
302 return (error);
303
304 error = intr_setup_irq(child, res, filt, intr, arg, flags, cookiep);
305
306 return (error);
307 }
308
309 static int
310 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
311 {
312
313 return (intr_teardown_irq(child, r, ih));
314 }
315
316 static bus_space_tag_t
317 nexus_get_bus_tag(device_t bus __unused, device_t child __unused)
318 {
319
320 return (&memmap_bus);
321 }
322
323 static int
324 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
325 struct resource *r)
326 {
327 struct resource_map map;
328 int err;
329
330 if ((err = rman_activate_resource(r)) != 0)
331 return (err);
332
333 /*
334 * If this is a memory resource, map it into the kernel.
335 */
336 switch (type) {
337 case SYS_RES_IOPORT:
338 case SYS_RES_MEMORY:
339 if ((rman_get_flags(r) & RF_UNMAPPED) == 0) {
340 err = nexus_map_resource(bus, child, type, r, NULL,
341 &map);
342 if (err != 0) {
343 rman_deactivate_resource(r);
344 return (err);
345 }
346
347 rman_set_mapping(r, &map);
348 }
349 break;
350 case SYS_RES_IRQ:
351 err = intr_activate_irq(child, r);
352 if (err != 0) {
353 rman_deactivate_resource(r);
354 return (err);
355 }
356 }
357 return (0);
358 }
359
360 static struct resource_list *
361 nexus_get_reslist(device_t dev, device_t child)
362 {
363 struct nexus_device *ndev = DEVTONX(child);
364
365 return (&ndev->nx_resources);
366 }
367
368 static int
369 nexus_set_resource(device_t dev, device_t child, int type, int rid,
370 rman_res_t start, rman_res_t count)
371 {
372 struct nexus_device *ndev = DEVTONX(child);
373 struct resource_list *rl = &ndev->nx_resources;
374
375 /* XXX this should return a success/failure indicator */
376 resource_list_add(rl, type, rid, start, start + count - 1, count);
377
378 return(0);
379 }
380
381 static int
382 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
383 struct resource *r)
384 {
385 bus_size_t psize;
386 bus_space_handle_t vaddr;
387
388 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
389 psize = (bus_size_t)rman_get_size(r);
390 vaddr = rman_get_bushandle(r);
391
392 if (vaddr != 0) {
393 bus_space_unmap(&memmap_bus, vaddr, psize);
394 rman_set_virtual(r, NULL);
395 rman_set_bushandle(r, 0);
396 }
397 } else if (type == SYS_RES_IRQ) {
398 intr_deactivate_irq(child, r);
399 }
400
401 return (rman_deactivate_resource(r));
402 }
403
404 static int
405 nexus_map_resource(device_t bus, device_t child, int type, struct resource *r,
406 struct resource_map_request *argsp, struct resource_map *map)
407 {
408 struct resource_map_request args;
409 rman_res_t end, length, start;
410
411 /* Resources must be active to be mapped. */
412 if ((rman_get_flags(r) & RF_ACTIVE) == 0)
413 return (ENXIO);
414
415 /* Mappings are only supported on I/O and memory resources. */
416 switch (type) {
417 case SYS_RES_IOPORT:
418 case SYS_RES_MEMORY:
419 break;
420 default:
421 return (EINVAL);
422 }
423
424 resource_init_map_request(&args);
425 if (argsp != NULL)
426 bcopy(argsp, &args, imin(argsp->size, args.size));
427 start = rman_get_start(r) + args.offset;
428 if (args.length == 0)
429 length = rman_get_size(r);
430 else
431 length = args.length;
432 end = start + length - 1;
433 if (start > rman_get_end(r) || start < rman_get_start(r))
434 return (EINVAL);
435 if (end > rman_get_end(r) || end < start)
436 return (EINVAL);
437
438 map->r_vaddr = pmap_mapdev(start, length);
439 map->r_bustag = &memmap_bus;
440 map->r_size = length;
441
442 /*
443 * The handle is the virtual address.
444 */
445 map->r_bushandle = (bus_space_handle_t)map->r_vaddr;
446 return (0);
447 }
448
449 EARLY_DRIVER_MODULE(nexus_fdt, root, nexus_fdt_driver, 0, 0,
450 BUS_PASS_BUS + BUS_PASS_ORDER_FIRST);
451
452 static int
453 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
454 pcell_t *intr)
455 {
456 struct intr_map_data_fdt *fdt_data;
457 size_t len;
458 u_int irq;
459
460 len = sizeof(*fdt_data) + icells * sizeof(pcell_t);
461 fdt_data = (struct intr_map_data_fdt *)intr_alloc_map_data(
462 INTR_MAP_DATA_FDT, len, M_WAITOK | M_ZERO);
463 fdt_data->iparent = iparent;
464 fdt_data->ncells = icells;
465 memcpy(fdt_data->cells, intr, icells * sizeof(pcell_t));
466 irq = intr_map_irq(NULL, iparent, (struct intr_map_data *)fdt_data);
467
468 return (irq);
469 }
Cache object: 645a1d3d403ee88b1ea50aa6ecd969ea
|