obio.c revision 1.77 
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
64struct 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
70union 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 */
79static	int obiomatch(device_t, cfdata_t, void *);
80static	void obioattach(device_t, device_t, void *);
81
82CFATTACH_DECL_NEW(obio, sizeof(union obio_softc),
83    obiomatch, obioattach, NULL, NULL);
84
85static 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 */
91struct obio4_busattachargs {
92	struct mainbus_attach_args	*ma;
93	const char			*name;
94};
95
96#if defined(SUN4)
97static	int obioprint(void *, const char *);
98static	int obiosearch(device_t, struct cfdata *, const int *, void *);
99static	paddr_t obio_bus_mmap(bus_space_tag_t, bus_addr_t, off_t, int, int);
100static	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 */
104static 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 */
113static int intr_obio2ipl[] = {
114	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
115};
116#endif
117
118static int
119obiomatch(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
129static void
130obioattach(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)
211static int
212obioprint(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
224static int
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
236static paddr_t
237obio_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
243static int
244obiosearch(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 */
294int
295obio_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