1 /* $NetBSD: obio.c,v 1.77 2023/12/20 05:33:18 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 1997,1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Paul Kranenburg.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: obio.c,v 1.77 2023/12/20 05:33:18 thorpej Exp $");
34
35 #include "locators.h"
36
37 #ifdef _KERNEL_OPT
38 #include "sbus.h"
39 #endif
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/device.h>
44
45 #ifdef DEBUG
46 #include <sys/proc.h>
47 #include <sys/syslog.h>
48 #endif
49
50 #include <uvm/uvm_extern.h>
51
52 #include <sys/bus.h>
53 #if NSBUS > 0
54 #include <sparc/dev/sbusvar.h>
55 #endif
56 #include <machine/autoconf.h>
57 #include <machine/oldmon.h>
58 #include <machine/cpu.h>
59 #include <machine/ctlreg.h>
60 #include <sparc/sparc/asm.h>
61 #include <sparc/sparc/vaddrs.h>
62 #include <sparc/sparc/cpuvar.h>
63
64 struct obio4_softc {
65 device_t sc_dev; /* base device */
66 bus_space_tag_t sc_bustag; /* parent bus tag */
67 bus_dma_tag_t sc_dmatag; /* parent bus DMA tag */
68 };
69
70 union obio_softc {
71 struct obio4_softc sc_obio; /* sun4 obio */
72 #if NSBUS > 0
73 struct sbus_softc sc_sbus; /* sun4m obio is another sbus slot */
74 #endif
75 };
76
77
78 /* autoconfiguration driver */
79 static int obiomatch(device_t, cfdata_t, void *);
80 static void obioattach(device_t, device_t, void *);
81
82 CFATTACH_DECL_NEW(obio, sizeof(union obio_softc),
83 obiomatch, obioattach, NULL, NULL);
84
85 static int obio_attached;
86
87 /*
88 * This `obio4_busattachargs' data structure only exists to pass down
89 * to obiosearch() the name of a device that must be configured early.
90 */
91 struct obio4_busattachargs {
92 struct mainbus_attach_args *ma;
93 const char *name;
94 };
95
96 #if defined(SUN4)
97 static int obioprint(void *, const char *);
98 static int obiosearch(device_t, struct cfdata *, const int *, void *);
99 static paddr_t obio_bus_mmap(bus_space_tag_t, bus_addr_t, off_t, int, int);
100 static int _obio_bus_map(bus_space_tag_t, bus_addr_t, bus_size_t, int,
101 vaddr_t, bus_space_handle_t *);
102
103 /* There's at most one obio bus, so we can allocate the bus tag statically */
104 static struct sparc_bus_space_tag obio_space_tag;
105 #endif
106
107 #if NSBUS > 0
108 /*
109 * Translate obio `interrupts' property value to processor IPL (see sbus.c)
110 * Apparently, the `interrupts' property on obio devices is just
111 * the processor IPL.
112 */
113 static int intr_obio2ipl[] = {
114 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
115 };
116 #endif
117
118 static int
obiomatch(device_t parent,struct cfdata * cf,void * aux)119 obiomatch(device_t parent, struct cfdata *cf, void *aux)
120 {
121 struct mainbus_attach_args *ma = aux;
122
123 if (obio_attached)
124 return 0;
125
126 return (strcmp(cf->cf_name, ma->ma_name) == 0);
127 }
128
129 static void
obioattach(device_t parent,device_t self,void * aux)130 obioattach(device_t parent, device_t self, void *aux)
131 {
132 struct mainbus_attach_args *ma = aux;
133
134 obio_attached = 1;
135
136 printf("\n");
137
138 if (CPU_ISSUN4) {
139 #if defined(SUN4)
140 union obio_softc *usc = device_private(self);
141 struct obio4_softc *sc = &usc->sc_obio;
142 struct obio4_busattachargs oa;
143 const char *const *cpp;
144 static const char *const special4[] = {
145 /* find these first */
146 "timer",
147 "dma", /* need this before `esp', if any */
148 NULL
149 };
150
151 sc->sc_dev = self;
152 sc->sc_bustag = ma->ma_bustag;
153 sc->sc_dmatag = ma->ma_dmatag;
154
155 memcpy(&obio_space_tag, sc->sc_bustag, sizeof(obio_space_tag));
156 obio_space_tag.cookie = sc;
157 obio_space_tag.parent = sc->sc_bustag;
158 obio_space_tag.sparc_bus_map = _obio_bus_map;
159 obio_space_tag.sparc_bus_mmap = obio_bus_mmap;
160
161 oa.ma = ma;
162
163 /* Find all `early' obio devices */
164 for (cpp = special4; *cpp != NULL; cpp++) {
165 oa.name = *cpp;
166 config_search(self, &oa,
167 CFARGS(.search = obiosearch));
168 }
169
170 /* Find all other obio devices */
171 oa.name = NULL;
172 config_search(self, &oa,
173 CFARGS(.search = obiosearch));
174 #endif
175 return;
176 } else if (CPU_ISSUN4M) {
177 #if NSBUS > 0
178 /*
179 * Attach the on-board I/O bus at on a sun4m.
180 * In this case we treat the obio bus as another sbus slot.
181 */
182 union obio_softc *usc = device_private(self);
183 struct sbus_softc *sc = &usc->sc_sbus;
184
185 static const char *const special4m[] = {
186 /* find these first */
187 "eeprom",
188 "counter",
189 #if 0 /* Not all sun4m's have an `auxio' */
190 "auxio",
191 #endif
192 "",
193 /* place device to ignore here */
194 "interrupt",
195 NULL
196 };
197
198 sc->sc_dev = self;
199 sc->sc_bustag = ma->ma_bustag;
200 sc->sc_dmatag = ma->ma_dmatag;
201 sc->sc_intr2ipl = intr_obio2ipl;
202
203 sbus_attach_common(sc, "obio", ma->ma_node, special4m);
204 #endif
205 } else {
206 printf("obio on this machine?\n");
207 }
208 }
209
210 #if defined(SUN4)
211 static int
obioprint(void * args,const char * busname)212 obioprint(void *args, const char *busname)
213 {
214 union obio_attach_args *uoba = args;
215 struct obio4_attach_args *oba = &uoba->uoba_oba4;
216
217 aprint_normal(" addr 0x%lx", (u_long)BUS_ADDR_PADDR(oba->oba_paddr));
218 if (oba->oba_pri != -1)
219 aprint_normal(" level %d", oba->oba_pri);
220
221 return (UNCONF);
222 }
223
224 static int
_obio_bus_map(bus_space_tag_t t,bus_addr_t ba,bus_size_t size,int flags,vaddr_t va,bus_space_handle_t * hp)225 _obio_bus_map(bus_space_tag_t t, bus_addr_t ba, bus_size_t size, int flags,
226 vaddr_t va, bus_space_handle_t *hp)
227 {
228
229 if ((flags & OBIO_BUS_MAP_USE_ROM) != 0 &&
230 obio_find_rom_map(ba, size, hp) == 0)
231 return (0);
232
233 return (bus_space_map2(t->parent, ba, size, flags, va, hp));
234 }
235
236 static paddr_t
obio_bus_mmap(bus_space_tag_t t,bus_addr_t ba,off_t off,int prot,int flags)237 obio_bus_mmap(bus_space_tag_t t, bus_addr_t ba, off_t off, int prot, int flags)
238 {
239
240 return (bus_space_mmap(t->parent, ba, off, prot, flags));
241 }
242
243 static int
obiosearch(device_t parent,struct cfdata * cf,const int * ldesc,void * aux)244 obiosearch(device_t parent, struct cfdata *cf, const int *ldesc,
245 void *aux)
246 {
247 struct obio4_busattachargs *oap = aux;
248 union obio_attach_args uoba;
249 struct obio4_attach_args *oba = &uoba.uoba_oba4;
250 int addr;
251
252 /* Check whether we're looking for a specifically named device */
253 if (oap->name != NULL && strcmp(oap->name, cf->cf_name) != 0)
254 return (0);
255
256 /*
257 * Avoid sun4m entries which don't have valid PAs.
258 * no point in even probing them.
259 */
260 addr = cf->cf_loc[OBIOCF_ADDR];
261 if (addr == -1)
262 return (0);
263
264 /*
265 * On the 4/100 obio addresses must be mapped at
266 * 0x0YYYYYYY, but alias higher up (we avoid the
267 * alias condition because it causes pmap difficulties)
268 * XXX: We also assume that 4/[23]00 obio addresses
269 * must be 0xZYYYYYYY, where (Z != 0)
270 */
271 if (cpuinfo.cpu_type == CPUTYP_4_100 && (addr & 0xf0000000))
272 return (0);
273 if (cpuinfo.cpu_type != CPUTYP_4_100 && !(addr & 0xf0000000))
274 return (0);
275
276 uoba.uoba_isobio4 = 1;
277 oba->oba_bustag = &obio_space_tag;
278 oba->oba_dmatag = oap->ma->ma_dmatag;
279 oba->oba_paddr = BUS_ADDR(PMAP_OBIO, addr);
280 oba->oba_pri = cf->cf_loc[OBIOCF_LEVEL];
281
282 if (!config_probe(parent, cf, &uoba))
283 return (0);
284
285 config_attach(parent, cf, &uoba, obioprint, CFARGS_NONE);
286 return (1);
287 }
288
289
290 /*
291 * If we can find a mapping that was established by the rom, use it.
292 * Else, create a new mapping.
293 */
294 int
obio_find_rom_map(bus_addr_t ba,int len,bus_space_handle_t * hp)295 obio_find_rom_map(bus_addr_t ba, int len, bus_space_handle_t *hp)
296 {
297 #define getpte(va) lda(va, ASI_PTE)
298
299 u_long pa, pf;
300 int pgtype;
301 u_long va, pte;
302
303 if (len > PAGE_SIZE)
304 return (EINVAL);
305
306 pa = BUS_ADDR_PADDR(ba);
307 pf = pa >> PGSHIFT;
308 pgtype = PMAP_T2PTE_4(PMAP_OBIO);
309
310 for (va = OLDMON_STARTVADDR; va < OLDMON_ENDVADDR; va += PAGE_SIZE) {
311 pte = getpte(va);
312 if ((pte & PG_V) == 0 || (pte & PG_TYPE) != pgtype ||
313 (pte & PG_PFNUM) != pf)
314 continue;
315
316 /*
317 * Found entry in PROM's pagetable
318 * note: preserve page offset
319 */
320 *hp = (bus_space_handle_t)(va | (pa & PGOFSET));
321 return (0);
322 }
323
324 return (ENOENT);
325 }
326 #endif /* SUN4 */
327