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 * from: src/sys/i386/i386/nexus.c,v 1.26.2.5 2000/11/16 09:30:57 nyan
30 * JNPR: mainbus.c,v 1.2.4.1 2007/08/16 13:02:11 girish
31 */
32
33 /*
34 * This code implements a `root mainbus' for Intel Architecture
35 * machines. The function of the root mainbus is to serve as an
36 * attachment point for both processors and buses, and to manage
37 * resources which are common to all of them. In particular,
38 * this code implements the core resource managers for interrupt
39 * requests, DMA requests (which rightfully should be a part of the
40 * ISA code but it's easier to do it here for now), I/O port addresses,
41 * and I/O memory address space.
42 */
43
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD: releng/8.4/sys/mips/mips/mainbus.c 223500 2011-06-24 13:41:46Z jhb $");
46
47 #include "opt_cputype.h"
48
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/bus.h>
52 #include <sys/kernel.h>
53 #include <sys/module.h>
54 #include <machine/bus.h>
55 #include <sys/rman.h>
56
57 #include <machine/vmparam.h>
58 #include <vm/vm.h>
59 #include <sys/lock.h>
60 #include <sys/mutex.h>
61 #include <vm/pmap.h>
62 #include <machine/pmap.h>
63 #include <machine/resource.h>
64
65 static struct rman irq_rman, port_rman, mem_rman;
66
67 static int mainbus_probe(device_t);
68 static int mainbus_attach(device_t);
69 static int mainbus_print_child(device_t, device_t);
70 static device_t mainbus_add_child(device_t bus, u_int order, const char *name,
71 int unit);
72 static struct resource *mainbus_alloc_resource(device_t, device_t, int, int *,
73 u_long, u_long, u_long, u_int);
74 static int mainbus_activate_resource(device_t, device_t, int, int,
75 struct resource *);
76 static int mainbus_deactivate_resource(device_t, device_t, int, int,
77 struct resource *);
78 static int mainbus_release_resource(device_t, device_t, int, int,
79 struct resource *);
80 static int mainbus_setup_intr(device_t, device_t, struct resource *,
81 int flags, driver_filter_t, void (*)(void *), void *, void **);
82 static int mainbus_teardown_intr(device_t, device_t, struct resource *,
83 void *);
84
85 static device_method_t mainbus_methods[] = {
86 /* Device interface */
87 DEVMETHOD(device_probe, mainbus_probe),
88 DEVMETHOD(device_attach, mainbus_attach),
89 DEVMETHOD(device_detach, bus_generic_detach),
90 DEVMETHOD(device_shutdown, bus_generic_shutdown),
91 DEVMETHOD(device_suspend, bus_generic_suspend),
92 DEVMETHOD(device_resume, bus_generic_resume),
93
94 /* Bus interface */
95 DEVMETHOD(bus_print_child, mainbus_print_child),
96 DEVMETHOD(bus_add_child, mainbus_add_child),
97 DEVMETHOD(bus_read_ivar, bus_generic_read_ivar),
98 DEVMETHOD(bus_write_ivar, bus_generic_write_ivar),
99 DEVMETHOD(bus_alloc_resource, mainbus_alloc_resource),
100 DEVMETHOD(bus_release_resource, mainbus_release_resource),
101 DEVMETHOD(bus_activate_resource, mainbus_activate_resource),
102 DEVMETHOD(bus_deactivate_resource, mainbus_deactivate_resource),
103 DEVMETHOD(bus_setup_intr, mainbus_setup_intr),
104 DEVMETHOD(bus_teardown_intr, mainbus_teardown_intr),
105
106 { 0, 0 }
107 };
108
109 static driver_t mainbus_driver = {
110 "mainbus",
111 mainbus_methods,
112 1, /* no softc */
113 };
114 static devclass_t mainbus_devclass;
115
116 DRIVER_MODULE(mainbus, root, mainbus_driver, mainbus_devclass, 0, 0);
117
118 static int
119 mainbus_probe(device_t dev)
120 {
121
122 #ifdef DEBUG_BRINGUP
123 device_verbose(dev); /* print attach message */
124 #else
125 device_quiet(dev); /* suppress attach message for neatness */
126 #endif
127
128 irq_rman.rm_start = 0;
129 irq_rman.rm_type = RMAN_ARRAY;
130 irq_rman.rm_descr = "Interrupt request lines";
131 irq_rman.rm_end = 15;
132 if (rman_init(&irq_rman) ||
133 rman_manage_region(&irq_rman, irq_rman.rm_start, irq_rman.rm_end))
134 panic("mainbus_probe irq_rman");
135
136 /*
137 * IO ports and Memory truely are global at this level,
138 * as are APIC interrupts (however many IO APICS there turn out
139 * to be on large systems..)
140 */
141 port_rman.rm_start = 0;
142 port_rman.rm_end = 0xffff;
143 port_rman.rm_type = RMAN_ARRAY;
144 port_rman.rm_descr = "I/O ports";
145 if (rman_init(&port_rman) || rman_manage_region(&port_rman, 0, 0xffff))
146 panic("mainbus_probe port_rman");
147
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("mainbus_probe mem_rman");
154
155 return bus_generic_probe(dev);
156 }
157
158 static int
159 mainbus_attach(device_t dev)
160 {
161 /*
162 * First, deal with the children we know about already
163 */
164 bus_generic_attach(dev);
165
166 return 0;
167 }
168
169 static int
170 mainbus_print_child(device_t bus, device_t child)
171 {
172 int retval = 0;
173
174 retval += bus_print_child_header(bus, child);
175 retval += printf(" on motherboard\n");
176
177 return (retval);
178 }
179
180 static device_t
181 mainbus_add_child(device_t bus, u_int order, const char *name, int unit)
182 {
183 return device_add_child_ordered(bus, order, name, unit);
184 }
185
186 /*
187 * Allocate a resource on behalf of child. NB: child is usually going to be a
188 * child of one of our descendants, not a direct child of mainbus0.
189 * (Exceptions include npx.)
190 */
191 static struct resource *
192 mainbus_alloc_resource(device_t bus, device_t child, int type, int *rid,
193 u_long start, u_long end, u_long count, u_int flags)
194 {
195 struct resource *rv;
196 struct rman *rm;
197 int needactivate = flags & RF_ACTIVE;
198
199 flags &= ~RF_ACTIVE;
200
201 switch (type) {
202 case SYS_RES_IRQ:
203 rm = &irq_rman;
204 break;
205
206 case SYS_RES_DRQ:
207 return 0;
208
209 case SYS_RES_IOPORT:
210 rm = &port_rman;
211 break;
212
213 case SYS_RES_MEMORY:
214 rm = &mem_rman;
215 break;
216
217 default:
218 return 0;
219 }
220
221 rv = rman_reserve_resource(rm, start, end, count, flags, child);
222
223 if (rv == 0) {
224 printf("mainbus_alloc_resource: no resource is available\n");
225 return 0;
226 }
227
228 if (type == SYS_RES_MEMORY) {
229 rman_set_bustag(rv, MIPS_BUS_SPACE_MEM);
230
231 } else if (type == SYS_RES_IOPORT) {
232 rman_set_bustag(rv, MIPS_BUS_SPACE_IO);
233 /* IBM-PC: the type of bus_space_handle_t is u_int */
234 rman_set_bushandle(rv, rman_get_start(rv));
235 }
236
237 if (needactivate) {
238 if (bus_activate_resource(child, type, *rid, rv)) {
239 rman_release_resource(rv);
240 return 0;
241 }
242 }
243
244 return rv;
245 }
246
247 static int
248 mainbus_activate_resource(device_t bus, device_t child, int type, int rid,
249 struct resource *r)
250 {
251 /*
252 * If this is a memory resource, map it into the kernel.
253 */
254 #ifdef CPU_CNMIPS
255 uint64_t temp;
256 #endif
257 if (rman_get_bustag(r) == MIPS_BUS_SPACE_MEM) {
258 caddr_t vaddr = 0;
259 {
260 u_int32_t paddr, psize, poffs;
261
262 paddr = rman_get_start(r);
263 psize = rman_get_size(r);
264
265 poffs = paddr - trunc_page(paddr);
266 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs)
267 + poffs;
268 }
269 rman_set_virtual(r, vaddr);
270 #ifdef CPU_CNMIPS
271 temp = 0x0000000000000000;
272 temp |= (uint32_t)vaddr;
273 rman_set_bushandle(r, (bus_space_handle_t) temp);
274 #else
275 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
276 #endif
277 }
278 return (rman_activate_resource(r));
279 }
280
281 static int
282 mainbus_deactivate_resource(device_t bus, device_t child, int type, int rid,
283 struct resource *r)
284 {
285 /*
286 * If this is a memory resource, unmap it.
287 */
288 if ((rman_get_bustag(r) == MIPS_BUS_SPACE_MEM) && (rman_get_end(r) >=
289 1024 * 1024)) {
290 u_int32_t psize;
291
292 psize = rman_get_size(r);
293 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
294 }
295
296 return (rman_deactivate_resource(r));
297 }
298
299 static int
300 mainbus_release_resource(device_t bus, device_t child, int type, int rid,
301 struct resource *r)
302 {
303 if (rman_get_flags(r) & RF_ACTIVE) {
304 int error = bus_deactivate_resource(child, type, rid, r);
305 if (error)
306 return error;
307 }
308 return (rman_release_resource(r));
309 }
310
311 /*
312 * Currently this uses the really grody interface from kern/kern_intr.c
313 * (which really doesn't belong in kern/anything.c). Eventually, all of
314 * the code in kern_intr.c and machdep_intr.c should get moved here, since
315 * this is going to be the official interface.
316 *
317 * Set up handler for external interrupt events.
318 * Use CR_INT_<n> to select the proper interrupt
319 * condition to dispatch on.
320 */
321 static int
322 mainbus_setup_intr(device_t bus, device_t child, struct resource *irq,
323 int flags, driver_filter_t filter, void (*ihand)(void *), void *arg,
324 void **cookiep)
325 {
326 panic("can never mainbus_setup_intr");
327 }
328
329 static int
330 mainbus_teardown_intr(device_t dev, device_t child, struct resource *r,
331 void *ih)
332 {
333 panic("can never mainbus_teardown_intr");
334 }
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