1 /* $NetBSD: vsbus.c,v 1.69 2024/02/17 17:41:43 tsutsui Exp $ */
2 /*
3 * Copyright (c) 1996, 1999 Ludd, University of Lule}, Sweden.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to Ludd by Bertram Barth.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: vsbus.c,v 1.69 2024/02/17 17:41:43 tsutsui Exp $");
31
32 #include "opt_cputype.h"
33
34 #define _VAX_BUS_DMA_PRIVATE
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/bus.h>
39 #include <sys/device.h>
40
41 #include <uvm/uvm_extern.h>
42
43 #include <machine/sid.h>
44 #include <machine/scb.h>
45 #include <machine/nexus.h>
46
47 #include <machine/uvax.h>
48 #include <machine/ka410.h>
49 #include <machine/ka420.h>
50 #include <machine/ka43.h>
51
52 #include <machine/mainbus.h>
53 #include <machine/vsbus.h>
54
55 #include "ioconf.h"
56 #include "locators.h"
57
58 static int vsbus_match(device_t, cfdata_t, void *);
59 static void vsbus_attach(device_t, device_t, void *);
60 static int vsbus_print(void *, const char *);
61 static int vsbus_search(device_t, cfdata_t, const int *, void *);
62
63 static SIMPLEQ_HEAD(, vsbus_dma) vsbus_dma;
64
65 CFATTACH_DECL_NEW(vsbus, sizeof(struct vsbus_softc),
66 vsbus_match, vsbus_attach, NULL, NULL);
67
68 static struct vax_bus_dma_tag vsbus_bus_dma_tag = {
69 ._dmamap_create = _bus_dmamap_create,
70 ._dmamap_destroy = _bus_dmamap_destroy,
71 ._dmamap_load = _bus_dmamap_load,
72 ._dmamap_load_mbuf = _bus_dmamap_load_mbuf,
73 ._dmamap_load_uio = _bus_dmamap_load_uio,
74 ._dmamap_load_raw = _bus_dmamap_load_raw,
75 ._dmamap_unload = _bus_dmamap_unload,
76 ._dmamap_sync = _bus_dmamap_sync,
77 ._dmamem_alloc = _bus_dmamem_alloc,
78 ._dmamem_free = _bus_dmamem_free,
79 ._dmamem_map = _bus_dmamem_map,
80 ._dmamem_unmap = _bus_dmamem_unmap,
81 ._dmamem_mmap = _bus_dmamem_mmap,
82 };
83
84 int
vsbus_print(void * aux,const char * name)85 vsbus_print(void *aux, const char *name)
86 {
87 struct vsbus_attach_args * const va = aux;
88
89 aprint_normal(" csr 0x%lx vec %o ipl %x maskbit %d", va->va_paddr,
90 va->va_cvec & 511, va->va_br, va->va_maskno - 1);
91 return UNCONF;
92 }
93
94 int
vsbus_match(device_t parent,cfdata_t cf,void * aux)95 vsbus_match(device_t parent, cfdata_t cf, void *aux)
96 {
97 struct mainbus_attach_args * const ma = aux;
98
99 return !strcmp("vsbus", ma->ma_type);
100 }
101
102 void
vsbus_attach(device_t parent,device_t self,void * aux)103 vsbus_attach(device_t parent, device_t self, void *aux)
104 {
105 struct mainbus_attach_args * const ma = aux;
106 struct vsbus_softc *sc = device_private(self);
107 int dbase, dsize;
108
109 aprint_normal("\n");
110
111 sc->sc_dev = self;
112 sc->sc_iot = ma->ma_iot;
113 sc->sc_dmatag = vsbus_bus_dma_tag;
114
115 switch (vax_boardtype) {
116 #if VAX49 || VAX53
117 case VAX_BTYP_53:
118 case VAX_BTYP_49:
119 sc->sc_vsregs = vax_map_physmem(VS_REGS_KA49, 1);
120 sc->sc_intreq = (char *)sc->sc_vsregs + 12;
121 sc->sc_intclr = (char *)sc->sc_vsregs + 12;
122 sc->sc_intmsk = (char *)sc->sc_vsregs + 8;
123 vsbus_dma_init(sc, 8192);
124 break;
125 #endif
126
127 #if VAX46 || VAX48
128 case VAX_BTYP_48:
129 case VAX_BTYP_46:
130 sc->sc_vsregs = vax_map_physmem(VS_REGS, 1);
131 sc->sc_intreq = (char *)sc->sc_vsregs + 15;
132 sc->sc_intclr = (char *)sc->sc_vsregs + 15;
133 sc->sc_intmsk = (char *)sc->sc_vsregs + 12;
134 vsbus_dma_init(sc, 32768);
135 break;
136 #endif
137
138 default:
139 sc->sc_vsregs = vax_map_physmem(VS_REGS, 1);
140 sc->sc_intreq = (char *)sc->sc_vsregs + 15;
141 sc->sc_intclr = (char *)sc->sc_vsregs + 15;
142 sc->sc_intmsk = (char *)sc->sc_vsregs + 12;
143 if (vax_boardtype == VAX_BTYP_410) {
144 dbase = KA410_DMA_BASE;
145 dsize = KA410_DMA_SIZE;
146 } else {
147 dbase = KA420_DMA_BASE;
148 dsize = KA420_DMA_SIZE;
149 }
150 sc->sc_dmasize = dsize;
151 sc->sc_dmaaddr = uvm_km_alloc(kernel_map, dsize, 0,
152 UVM_KMF_VAONLY);
153 ioaccess(sc->sc_dmaaddr, dbase, dsize/VAX_NBPG);
154 break;
155 }
156
157 SIMPLEQ_INIT(&vsbus_dma);
158 /*
159 * First: find which interrupts we won't care about.
160 * There are interrupts that interrupt on a periodic basic
161 * that we don't want to interfere with the rest of the
162 * interrupt probing.
163 */
164 *sc->sc_intmsk = 0;
165 *sc->sc_intclr = 0xff;
166 DELAY(1000000); /* Wait a second */
167 sc->sc_mask = *sc->sc_intreq;
168 aprint_normal_dev(self, "interrupt mask %x\n", sc->sc_mask);
169 /*
170 * now check for all possible devices on this "bus"
171 */
172 config_search(self, NULL,
173 CFARGS(.search = vsbus_search));
174
175 /* Autoconfig finished, enable interrupts */
176 *sc->sc_intmsk = ~sc->sc_mask;
177 }
178
179 int
vsbus_search(device_t parent,cfdata_t cf,const int * ldesc,void * aux)180 vsbus_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux)
181 {
182 struct vsbus_softc *sc = device_private(parent);
183 struct vsbus_attach_args va;
184 int i, vec, br;
185 u_char c;
186
187 va.va_paddr = cf->cf_loc[VSBUSCF_CSR];
188 va.va_addr = vax_map_physmem(va.va_paddr, 1);
189 va.va_dmat = &sc->sc_dmatag;
190 va.va_memt = sc->sc_iot;
191
192 *sc->sc_intmsk = 0;
193 *sc->sc_intclr = 0xff;
194 scb_vecref(0, 0); /* Clear vector ref */
195
196 i = config_probe(parent, cf, &va);
197 vax_unmap_physmem(va.va_addr, 1);
198 c = *sc->sc_intreq & ~sc->sc_mask;
199 if (i == 0)
200 goto forgetit;
201 if (i > 10)
202 c = sc->sc_mask; /* Fooling interrupt */
203 else if (c == 0)
204 goto forgetit;
205
206 *sc->sc_intmsk = c;
207 DELAY(100);
208 *sc->sc_intmsk = 0;
209 va.va_maskno = ffs((u_int)c);
210 i = scb_vecref(&vec, &br);
211 if (i == 0)
212 goto fail;
213 if (vec == 0)
214 goto fail;
215
216 va.va_br = br;
217 va.va_cvec = vec;
218 va.va_dmaaddr = sc->sc_dmaaddr;
219 va.va_dmasize = sc->sc_dmasize;
220 *sc->sc_intmsk = c; /* Allow interrupts during attach */
221 config_attach(parent, cf, &va, vsbus_print, CFARGS_NONE);
222 *sc->sc_intmsk = 0;
223 return 0;
224
225 fail:
226 printf("%s%d at %s csr 0x%x %s\n",
227 cf->cf_name, cf->cf_unit, device_xname(parent),
228 cf->cf_loc[VSBUSCF_CSR], (i ? "zero vector" : "didn't interrupt"));
229 forgetit:
230 return 0;
231 }
232
233 /*
234 * Sets a new interrupt mask. Returns the old one.
235 * Works like spl functions.
236 */
237 unsigned char
vsbus_setmask(int mask)238 vsbus_setmask(int mask)
239 {
240 struct vsbus_softc * const sc = device_lookup_private(&vsbus_cd, 0);
241 unsigned char ch;
242
243 if (sc == NULL)
244 return 0;
245
246 ch = *sc->sc_intmsk;
247 *sc->sc_intmsk = mask;
248 return ch;
249 }
250
251 /*
252 * Clears the interrupts in mask.
253 */
254 void
vsbus_clrintr(int mask)255 vsbus_clrintr(int mask)
256 {
257 struct vsbus_softc * const sc = device_lookup_private(&vsbus_cd, 0);
258 if (sc == NULL)
259 return;
260
261 *sc->sc_intclr = mask;
262 }
263
264 #define puvtopte(va, pmap) \
265 (((vaddr_t)va < 0x40000000) ? \
266 &(((pmap)->pm_p0br)[PG_PFNUM(va)]) : \
267 &(((pmap)->pm_p1br)[PG_PFNUM(va)]))
268
269 /*
270 * Copy data from/to a user process' space from the DMA area.
271 * Use the physical memory directly.
272 */
273 void
vsbus_copytoproc(struct proc * p,void * fromv,void * tov,int len)274 vsbus_copytoproc(struct proc *p, void *fromv, void *tov, int len)
275 {
276 char *from = fromv, *to = tov;
277 struct pmap *pm;
278 struct pte *pte;
279 paddr_t pa;
280
281 if ((vaddr_t)to & KERNBASE) { /* In kernel space */
282 memcpy(to, from, len);
283 return;
284 }
285
286 #ifdef DIAGNOSTIC
287 if (p == NULL)
288 panic("vsbus_copytoproc: no proc");
289 #endif
290
291 pm = p->p_vmspace->vm_map.pmap;
292 pte = puvtopte(trunc_page((vaddr_t)to), pm);
293 if ((vaddr_t)to & PGOFSET) {
294 int cz = round_page((vaddr_t)to) - (vaddr_t)to;
295
296 pa = (pte->pg_pfn << VAX_PGSHIFT) | (PAGE_SIZE - cz) | KERNBASE;
297 memcpy((void *)pa, from, uimin(cz, len));
298 from += cz;
299 to += cz;
300 len -= cz;
301 pte += 8; /* XXX */
302 }
303 while (len > 0) {
304 pa = (pte->pg_pfn << VAX_PGSHIFT) | KERNBASE;
305 memcpy((void *)pa, from, uimin(PAGE_SIZE, len));
306 from += PAGE_SIZE;
307 to += PAGE_SIZE;
308 len -= PAGE_SIZE;
309 pte += 8; /* XXX */
310 }
311 }
312
313 void
vsbus_copyfromproc(struct proc * p,void * fromv,void * tov,int len)314 vsbus_copyfromproc(struct proc *p, void *fromv, void *tov, int len)
315 {
316 char *from = fromv, *to = tov;
317 struct pmap *pm;
318 struct pte *pte;
319 paddr_t pa;
320
321 if ((vaddr_t)from & KERNBASE) { /* In kernel space */
322 memcpy(to, from, len);
323 return;
324 }
325
326 #ifdef DIAGNOSTIC
327 if (p == NULL)
328 panic("vsbus_copyfromproc: no proc");
329 #endif
330
331 pm = p->p_vmspace->vm_map.pmap;
332 pte = puvtopte(trunc_page((vaddr_t)from), pm);
333 if ((vaddr_t)from & PGOFSET) {
334 int cz = round_page((vaddr_t)from) - (vaddr_t)from;
335
336 pa = (pte->pg_pfn << VAX_PGSHIFT) | (PAGE_SIZE - cz) | KERNBASE;
337 memcpy(to, (void *)pa, uimin(cz, len));
338 from += cz;
339 to += cz;
340 len -= cz;
341 pte += 8; /* XXX */
342 }
343 while (len > 0) {
344 pa = (pte->pg_pfn << VAX_PGSHIFT) | KERNBASE;
345 memcpy(to, (void *)pa, uimin(PAGE_SIZE, len));
346 from += PAGE_SIZE;
347 to += PAGE_SIZE;
348 len -= PAGE_SIZE;
349 pte += 8; /* XXX */
350 }
351 }
352
353 /*
354 * There can only be one user of the DMA area on VS2k/VS3100 at one
355 * time, so keep track of it here.
356 */
357 static int vsbus_active = 0;
358
359 void
vsbus_dma_start(struct vsbus_dma * vd)360 vsbus_dma_start(struct vsbus_dma *vd)
361 {
362
363 SIMPLEQ_INSERT_TAIL(&vsbus_dma, vd, vd_q);
364
365 if (vsbus_active == 0)
366 vsbus_dma_intr();
367 }
368
369 void
vsbus_dma_intr(void)370 vsbus_dma_intr(void)
371 {
372 struct vsbus_dma *vd;
373
374 vd = SIMPLEQ_FIRST(&vsbus_dma);
375 if (vd == NULL) {
376 vsbus_active = 0;
377 return;
378 }
379 vsbus_active = 1;
380 SIMPLEQ_REMOVE_HEAD(&vsbus_dma, vd_q);
381 (*vd->vd_go)(vd->vd_arg);
382 }
383
384