Annotation of sys/arch/mvme88k/dev/mainbus.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: mainbus.c,v 1.22 2007/02/11 12:41:29 miod Exp $ */
2: /*
3: * Copyright (c) 1998 Steve Murphree, Jr.
4: * Copyright (c) 2004, Miodrag Vallat.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18: * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
19: * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20: * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21: * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
23: * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
24: * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25: * POSSIBILITY OF SUCH DAMAGE.
26: */
27:
28: #include <sys/param.h>
29: #include <sys/systm.h>
30: #include <sys/reboot.h>
31: #include <sys/conf.h>
32: #include <sys/device.h>
33: #include <sys/disklabel.h>
34: #include <sys/extent.h>
35: #include <sys/malloc.h>
36:
37: #include <uvm/uvm_extern.h>
38:
39: #include <machine/bus.h>
40: #include <machine/autoconf.h>
41: #include <machine/cmmu.h>
42: #include <machine/cpu.h>
43:
44: #ifdef M88100
45: #include <machine/m8820x.h>
46: #endif
47: #ifdef MVME187
48: #include <machine/mvme187.h>
49: #endif
50: #ifdef MVME188
51: #include <machine/mvme188.h>
52: #endif
53: #ifdef MVME197
54: #include <machine/mvme197.h>
55: #endif
56:
57: void mainbus_attach(struct device *, struct device *, void *);
58: int mainbus_match(struct device *, void *, void *);
59: int mainbus_print(void *, const char *);
60: int mainbus_scan(struct device *, void *, void *);
61:
62: /*
63: * bus_space routines for 1:1 obio mappings
64: */
65:
66: int mainbus_map(bus_addr_t, bus_size_t, int, bus_space_handle_t *);
67: void mainbus_unmap(bus_space_handle_t, bus_size_t);
68: int mainbus_subregion(bus_space_handle_t, bus_size_t, bus_size_t,
69: bus_space_handle_t *);
70: void *mainbus_vaddr(bus_space_handle_t);
71:
72: const struct mvme88k_bus_space_tag mainbus_bustag = {
73: mainbus_map,
74: mainbus_unmap,
75: mainbus_subregion,
76: mainbus_vaddr
77: };
78:
79: bus_addr_t bs_obio_start;
80: bus_addr_t bs_obio_end;
81: struct extent *bs_extent;
82:
83: /*
84: * Obio (internal IO) space is mapped 1:1 (see pmap_bootstrap() for details).
85: *
86: * However, sram attaches as a child of mainbus, but does not reside in
87: * internal IO space. As a result, we have to allow both 1:1 and regular
88: * translations, depending upon the address to map.
89: */
90:
91: int
92: mainbus_map(bus_addr_t addr, bus_size_t size, int flags,
93: bus_space_handle_t *ret)
94: {
95: vaddr_t map;
96:
97: map = mapiodev((paddr_t)addr, size);
98: if (map == NULL)
99: return ENOMEM;
100:
101: *ret = (bus_space_handle_t)map;
102: return 0;
103: }
104:
105: void
106: mainbus_unmap(bus_space_handle_t handle, bus_size_t size)
107: {
108: /* XXX what to do for non-obio mappings? */
109: }
110:
111: int
112: mainbus_subregion(bus_space_handle_t handle, bus_addr_t offset,
113: bus_size_t size, bus_space_handle_t *ret)
114: {
115: *ret = handle + offset;
116: return (0);
117: }
118:
119: void *
120: mainbus_vaddr(bus_space_handle_t handle)
121: {
122: return (void *)handle;
123: }
124:
125: /*
126: * Map a range [pa, pa+size) in the given map to a kernel address
127: * in iomap space.
128: *
129: * Note: To be flexible, I did not put a restriction on the alignment
130: * of pa. However, it is advisable to have pa page aligned since otherwise,
131: * we might have several mappings for a given chunk of the IO page.
132: */
133: vaddr_t
134: mapiodev(paddr_t addr, int _size)
135: {
136: vaddr_t va, iova, off;
137: paddr_t pa, epa;
138: psize_t size;
139: int s, error;
140:
141: /* sanity checks */
142: if (_size <= 0)
143: return NULL;
144: size = (psize_t)_size;
145: epa = addr + size;
146: if (epa < addr && epa != 0)
147: return NULL;
148:
149: /* check for 1:1 mapping */
150: if (addr >= bs_obio_start) {
151: if (bs_obio_end == 0 || epa <= bs_obio_end)
152: return ((vaddr_t)addr);
153: else if (addr <= bs_obio_end)
154: /* accross obio and non-obio, not supported */
155: return NULL;
156: }
157:
158: pa = trunc_page(addr);
159: off = addr & PGOFSET;
160: size = round_page(off + size);
161:
162: s = splhigh();
163: error = extent_alloc_region(bs_extent, atop(pa), atop(size),
164: EX_MALLOCOK | (cold ? 0 : EX_WAITSPACE));
165: splx(s);
166:
167: if (error != 0)
168: return NULL;
169:
170: va = uvm_km_valloc(kernel_map, size);
171: if (va == 0) {
172: extent_free(bs_extent, atop(pa), atop(size),
173: EX_MALLOCOK | (cold ? 0 : EX_WAITSPACE));
174: return NULL;
175: }
176:
177: iova = va + off;
178: while (size != 0) {
179: pmap_enter(pmap_kernel(), va, pa, UVM_PROT_RW,
180: UVM_PROT_RW | PMAP_WIRED);
181: size -= PAGE_SIZE;
182: va += PAGE_SIZE;
183: pa += PAGE_SIZE;
184: }
185: pmap_update(pmap_kernel());
186:
187: return (iova);
188: }
189:
190: /*
191: * Free up the mapping in iomap.
192: */
193: void
194: unmapiodev(vaddr_t va, int _size)
195: {
196: vaddr_t eva, kva, off;
197: vsize_t size;
198: paddr_t pa;
199: int s, error;
200:
201: /* sanity checks */
202: if (_size <= 0)
203: return;
204: size = (vsize_t)_size;
205: eva = va + size;
206: if (eva < va && eva != 0)
207: return;
208:
209: /* check for 1:1 mapping */
210: if (va >= bs_obio_start) {
211: if (bs_obio_end == 0 || eva <= bs_obio_end)
212: return;
213: else if (va <= bs_obio_end)
214: /* accross obio and non-obio, not supported */
215: return;
216: }
217:
218: off = va & PGOFSET;
219: kva = trunc_page(va);
220: size = round_page(off + size);
221:
222: if (pmap_extract(pmap_kernel(), kva, &pa) == FALSE)
223: panic("unmapiodev(%p,%p)", kva, size);
224:
225: pmap_remove(pmap_kernel(), kva, kva + size);
226: pmap_update(pmap_kernel());
227: uvm_km_free(kernel_map, kva, size);
228:
229: s = splhigh();
230: error = extent_free(bs_extent, atop(pa), atop(size),
231: EX_MALLOCOK | (cold ? 0 : EX_WAITSPACE));
232: #ifdef DIAGNOSTIC
233: if (error != 0)
234: printf("unmapiodev(%p pa %p, %p): extent_free failed\n",
235: kva, pa, size);
236: #endif
237: splx(s);
238: }
239:
240: /*
241: * Configuration glue
242: */
243:
244: struct cfattach mainbus_ca = {
245: sizeof(struct device), mainbus_match, mainbus_attach
246: };
247:
248: struct cfdriver mainbus_cd = {
249: NULL, "mainbus", DV_DULL
250: };
251:
252: int
253: mainbus_match(struct device *parent, void *cf, void *args)
254: {
255: return (1);
256: }
257:
258: int
259: mainbus_print(void *args, const char *bus)
260: {
261: struct confargs *ca = args;
262:
263: if (ca->ca_paddr != -1)
264: printf(" addr 0x%x", ca->ca_paddr);
265: return (UNCONF);
266: }
267:
268: int
269: mainbus_scan(struct device *parent, void *child, void *args)
270: {
271: struct cfdata *cf = child;
272: struct confargs oca;
273:
274: bzero(&oca, sizeof oca);
275: oca.ca_iot = &mainbus_bustag;
276: oca.ca_dmat = 0; /* XXX no need for a meaningful value yet */
277: oca.ca_bustype = BUS_MAIN;
278: oca.ca_paddr = cf->cf_loc[0];
279: oca.ca_ipl = -1;
280: oca.ca_name = cf->cf_driver->cd_name;
281: if ((*cf->cf_attach->ca_match)(parent, cf, &oca) == 0)
282: return (0);
283: config_attach(parent, cf, &oca, mainbus_print);
284: return (1);
285: }
286:
287: void
288: mainbus_attach(struct device *parent, struct device *self, void *args)
289: {
290: extern char cpu_model[];
291:
292: printf(": %s\n", cpu_model);
293:
294: /*
295: * Display cpu/mmu details for the main processor.
296: */
297: cpu_configuration_print(1);
298:
299: /*
300: * Initialize an extent to keep track of I/O mappings.
301: */
302: #ifdef M88100
303: if (CPU_IS88100) {
304: bs_obio_start = BATC8_VA; /* hardwired BATC */
305: bs_obio_end = 0;
306: }
307: #endif
308: #ifdef MVME197
309: if (CPU_IS88110) {
310: bs_obio_start = OBIO197_START;
311: bs_obio_end = OBIO197_START + OBIO197_SIZE;
312: }
313: #endif
314: bs_extent = extent_create("bus_space", atop(physmem),
315: 1 + atop(0U - PAGE_SIZE), M_DEVBUF, NULL, 0, EX_NOWAIT);
316: if (bs_extent == NULL)
317: panic("unable to allocate bus_space extent");
318:
319: (void)config_search(mainbus_scan, self, args);
320: }
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