1 /* $NetBSD: kdb.c,v 1.26 2001/11/13 12:51:34 lukem Exp $ */ 2 /* 3 * Copyright (c) 1996 Ludd, University of Lule}, Sweden. 4 * All rights reserved. 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 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed at Ludd, University of 17 * Lule}, Sweden and its contributors. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * KDB50 disk device driver 35 */ 36 /* 37 * TODO 38 * Implement node reset routine. 39 * Nices hardware error handling. 40 */ 41 42 #include <sys/cdefs.h> 43 __KERNEL_RCSID(0, "$NetBSD: kdb.c,v 1.26 2001/11/13 12:51:34 lukem Exp $"); 44 45 #include <sys/param.h> 46 #include <sys/kernel.h> 47 #include <sys/buf.h> 48 #include <sys/device.h> 49 #include <sys/proc.h> 50 #include <sys/user.h> 51 #include <sys/malloc.h> 52 #include <sys/systm.h> 53 #include <sys/sched.h> 54 55 #include <uvm/uvm_extern.h> 56 57 #ifdef __vax__ 58 #include <machine/pte.h> 59 #include <machine/pcb.h> 60 #endif 61 #include <machine/bus.h> 62 63 #include <dev/bi/bireg.h> 64 #include <dev/bi/bivar.h> 65 #include <dev/bi/kdbreg.h> 66 67 #include <dev/mscp/mscp.h> 68 #include <dev/mscp/mscpreg.h> 69 #include <dev/mscp/mscpvar.h> 70 71 #include "locators.h" 72 73 #define KDB_WL(adr, val) bus_space_write_4(sc->sc_iot, sc->sc_ioh, adr, val) 74 #define KDB_RL(adr) bus_space_read_4(sc->sc_iot, sc->sc_ioh, adr) 75 #define KDB_RS(adr) bus_space_read_2(sc->sc_iot, sc->sc_ioh, adr) 76 77 #define b_forw b_hash.le_next 78 /* 79 * Software status, per controller. 80 */ 81 struct kdb_softc { 82 struct device sc_dev; /* Autoconfig info */ 83 struct evcnt sc_intrcnt; /* Interrupt counting */ 84 caddr_t sc_kdb; /* Struct for kdb communication */ 85 struct mscp_softc *sc_softc; /* MSCP info (per mscpvar.h) */ 86 bus_dma_tag_t sc_dmat; 87 bus_dmamap_t sc_cmap; /* Control structures */ 88 bus_space_tag_t sc_iot; 89 bus_space_handle_t sc_ioh; 90 }; 91 92 int kdbmatch __P((struct device *, struct cfdata *, void *)); 93 void kdbattach __P((struct device *, struct device *, void *)); 94 void kdbreset __P((int)); 95 void kdbintr __P((void *)); 96 void kdbctlrdone __P((struct device *)); 97 int kdbprint __P((void *, const char *)); 98 void kdbsaerror __P((struct device *, int)); 99 void kdbgo __P((struct device *, struct mscp_xi *)); 100 101 struct cfattach kdb_ca = { 102 sizeof(struct kdb_softc), kdbmatch, kdbattach 103 }; 104 105 /* 106 * More driver definitions, for generic MSCP code. 107 */ 108 struct mscp_ctlr kdb_mscp_ctlr = { 109 kdbctlrdone, 110 kdbgo, 111 kdbsaerror, 112 }; 113 114 int 115 kdbprint(aux, name) 116 void *aux; 117 const char *name; 118 { 119 if (name) 120 printf("%s: mscpbus", name); 121 return UNCONF; 122 } 123 124 /* 125 * Poke at a supposed KDB to see if it is there. 126 */ 127 int 128 kdbmatch(parent, cf, aux) 129 struct device *parent; 130 struct cfdata *cf; 131 void *aux; 132 { 133 struct bi_attach_args *ba = aux; 134 135 if (bus_space_read_2(ba->ba_iot, ba->ba_ioh, BIREG_DTYPE) != BIDT_KDB50) 136 return 0; 137 138 if (cf->cf_loc[BICF_NODE] != BICF_NODE_DEFAULT && 139 cf->cf_loc[BICF_NODE] != ba->ba_nodenr) 140 return 0; 141 142 return 1; 143 } 144 145 void 146 kdbattach(parent, self, aux) 147 struct device *parent, *self; 148 void *aux; 149 { 150 struct kdb_softc *sc = (void *)self; 151 struct bi_attach_args *ba = aux; 152 struct mscp_attach_args ma; 153 volatile int i = 10000; 154 int error, rseg; 155 bus_dma_segment_t seg; 156 157 printf("\n"); 158 bi_intr_establish(ba->ba_icookie, ba->ba_ivec, 159 kdbintr, sc, &sc->sc_intrcnt); 160 evcnt_attach_dynamic(&sc->sc_intrcnt, EVCNT_TYPE_INTR, NULL, 161 sc->sc_dev.dv_xname, "intr"); 162 163 sc->sc_iot = ba->ba_iot; 164 sc->sc_ioh = ba->ba_ioh; 165 sc->sc_dmat = ba->ba_dmat; 166 167 /* 168 * Map the communication area and command and 169 * response packets into Unibus space. 170 */ 171 if ((error = bus_dmamem_alloc(sc->sc_dmat, sizeof(struct mscp_pack), 172 NBPG, 0, &seg, 1, &rseg, BUS_DMA_NOWAIT)) != 0) { 173 printf("Alloc ctrl area %d\n", error); 174 return; 175 } 176 if ((error = bus_dmamem_map(sc->sc_dmat, &seg, rseg, 177 sizeof(struct mscp_pack), &sc->sc_kdb, 178 BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) != 0) { 179 printf("Map ctrl area %d\n", error); 180 err: bus_dmamem_free(sc->sc_dmat, &seg, rseg); 181 return; 182 } 183 if ((error = bus_dmamap_create(sc->sc_dmat, sizeof(struct mscp_pack), 184 1, sizeof(struct mscp_pack), 0, BUS_DMA_NOWAIT, &sc->sc_cmap))) { 185 printf("Create DMA map %d\n", error); 186 err2: bus_dmamem_unmap(sc->sc_dmat, sc->sc_kdb, 187 sizeof(struct mscp_pack)); 188 goto err; 189 } 190 if ((error = bus_dmamap_load(sc->sc_dmat, sc->sc_cmap, 191 sc->sc_kdb, sizeof(struct mscp_pack), 0, BUS_DMA_NOWAIT))) { 192 printf("Load ctrl map %d\n", error); 193 bus_dmamap_destroy(sc->sc_dmat, sc->sc_cmap); 194 goto err2; 195 } 196 memset(sc->sc_kdb, 0, sizeof(struct mscp_pack)); 197 198 ma.ma_mc = &kdb_mscp_ctlr; 199 ma.ma_type = MSCPBUS_DISK|MSCPBUS_KDB; 200 ma.ma_uda = (struct mscp_pack *)sc->sc_kdb; 201 ma.ma_softc = &sc->sc_softc; 202 ma.ma_iot = sc->sc_iot; 203 ma.ma_iph = sc->sc_ioh + KDB_IP; 204 ma.ma_sah = sc->sc_ioh + KDB_SA; 205 ma.ma_swh = sc->sc_ioh + KDB_SW; 206 ma.ma_dmat = sc->sc_dmat; 207 ma.ma_dmam = sc->sc_cmap; 208 ma.ma_ivec = ba->ba_ivec; 209 ma.ma_ctlrnr = ba->ba_nodenr; 210 ma.ma_adapnr = ba->ba_busnr; 211 212 KDB_WL(BIREG_VAXBICSR, KDB_RL(BIREG_VAXBICSR) | BICSR_NRST); 213 while (i--) /* Need delay??? */ 214 ; 215 KDB_WL(BIREG_INTRDES, ba->ba_intcpu); /* Interrupt on CPU # */ 216 KDB_WL(BIREG_BCICSR, KDB_RL(BIREG_BCICSR) | 217 BCI_STOPEN | BCI_IDENTEN | BCI_UINTEN | BCI_INTEN); 218 KDB_WL(BIREG_UINTRCSR, ba->ba_ivec); 219 config_found(&sc->sc_dev, &ma, kdbprint); 220 } 221 222 void 223 kdbgo(usc, mxi) 224 struct device *usc; 225 struct mscp_xi *mxi; 226 { 227 struct kdb_softc *sc = (void *)usc; 228 struct buf *bp = mxi->mxi_bp; 229 struct mscp *mp = mxi->mxi_mp; 230 u_int32_t addr = (u_int32_t)bp->b_data; 231 u_int32_t mapaddr; 232 int err; 233 234 /* 235 * The KDB50 wants to read VAX Page tables directly, therefore 236 * the result from bus_dmamap_load() is uninteresting. (But it 237 * should never fail!). 238 * 239 * On VAX, point to the corresponding page tables. (user/sys) 240 * On other systems, do something else... 241 */ 242 err = bus_dmamap_load(sc->sc_dmat, mxi->mxi_dmam, bp->b_data, 243 bp->b_bcount, (bp->b_flags & B_PHYS ? bp->b_proc : 0), 244 BUS_DMA_NOWAIT); 245 246 if (err) /* Shouldn't happen */ 247 panic("kdbgo: bus_dmamap_load: error %d", err); 248 249 #ifdef __vax__ 250 /* 251 * Get a pointer to the pte pointing out the first virtual address. 252 * Use different ways in kernel and user space. 253 */ 254 if ((bp->b_flags & B_PHYS) == 0) { 255 mapaddr = ((u_int32_t)kvtopte(addr)) & ~KERNBASE; 256 } else { 257 struct pcb *pcb; 258 u_int32_t eaddr; 259 260 /* 261 * We check if the PTE's needed crosses a page boundary. 262 * If they do; only transfer the amount of data that is 263 * mapped by the first PTE page and led the system handle 264 * the rest of the data. 265 */ 266 pcb = &bp->b_proc->p_addr->u_pcb; 267 mapaddr = (u_int32_t)uvtopte(addr, pcb); 268 eaddr = (u_int32_t)uvtopte(addr + (bp->b_bcount - 1), pcb); 269 if (trunc_page(mapaddr) != trunc_page(eaddr)) { 270 mp->mscp_seq.seq_bytecount = 271 (((round_page(mapaddr) - mapaddr)/4) * 512); 272 } 273 mapaddr = kvtophys(mapaddr); 274 } 275 #else 276 #error Must write code to handle KDB50 on non-vax. 277 #endif 278 279 mp->mscp_seq.seq_mapbase = mapaddr; 280 mxi->mxi_dmam->dm_segs[0].ds_addr = (addr & 511) | KDB_MAP; 281 mscp_dgo(sc->sc_softc, mxi); 282 } 283 284 void 285 kdbsaerror(usc, doreset) 286 struct device *usc; 287 int doreset; 288 { 289 struct kdb_softc *sc = (void *)usc; 290 291 if ((KDB_RS(KDB_SA) & MP_ERR) == 0) 292 return; 293 printf("%s: controller error, sa=0x%x\n", sc->sc_dev.dv_xname, 294 KDB_RS(KDB_SA)); 295 /* What to do now??? */ 296 } 297 298 /* 299 * Interrupt routine. Depending on the state of the controller, 300 * continue initialisation, or acknowledge command and response 301 * interrupts, and process responses. 302 */ 303 void 304 kdbintr(void *arg) 305 { 306 struct kdb_softc *sc = arg; 307 308 if (KDB_RS(KDB_SA) & MP_ERR) { /* ctlr fatal error */ 309 kdbsaerror(&sc->sc_dev, 1); 310 return; 311 } 312 KERNEL_LOCK(LK_CANRECURSE|LK_EXCLUSIVE); 313 mscp_intr(sc->sc_softc); 314 KERNEL_UNLOCK(); 315 } 316 317 #ifdef notyet 318 /* 319 * The KDB50 has been reset. Reinitialise the controller 320 * and requeue outstanding I/O. 321 */ 322 void 323 kdbreset(ctlr) 324 int ctlr; 325 { 326 struct kdb_softc *sc; 327 328 sc = kdb_cd.cd_devs[ctlr]; 329 printf(" kdb%d", ctlr); 330 331 332 /* reset queues and requeue pending transfers */ 333 mscp_requeue(sc->sc_softc); 334 335 /* 336 * If it fails to initialise we will notice later and 337 * try again (and again...). Do not call kdbstart() 338 * here; it will be done after the controller finishes 339 * initialisation. 340 */ 341 if (kdbinit(sc)) 342 printf(" (hung)"); 343 } 344 #endif 345 346 void 347 kdbctlrdone(usc) 348 struct device *usc; 349 { 350 } 351