1 /* $NetBSD: isa_machdep.c,v 1.38 2017/12/13 16:30:18 bouyer Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 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 Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace 9 * Simulation Facility, NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /*- 34 * Copyright (c) 1991 The Regents of the University of California. 35 * All rights reserved. 36 * 37 * This code is derived from software contributed to Berkeley by 38 * William Jolitz. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 * @(#)isa.c 7.2 (Berkeley) 5/13/91 65 */ 66 67 #include <sys/cdefs.h> 68 __KERNEL_RCSID(0, "$NetBSD: isa_machdep.c,v 1.38 2017/12/13 16:30:18 bouyer Exp $"); 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/kernel.h> 73 #include <sys/syslog.h> 74 #include <sys/device.h> 75 #include <sys/proc.h> 76 #include <sys/mbuf.h> 77 #include <sys/bus.h> 78 #include <sys/cpu.h> 79 80 #include <machine/bus_private.h> 81 #include <machine/pio.h> 82 #include <machine/cpufunc.h> 83 #include <machine/autoconf.h> 84 #include <machine/bootinfo.h> 85 86 #include <dev/isa/isareg.h> 87 #include <dev/isa/isavar.h> 88 89 #include <uvm/uvm_extern.h> 90 91 #include "acpica.h" 92 #include "opt_acpi.h" 93 #include "ioapic.h" 94 95 #if NIOAPIC > 0 96 #include <machine/i82093var.h> 97 #include <machine/mpbiosvar.h> 98 #endif 99 100 static int _isa_dma_may_bounce(bus_dma_tag_t, bus_dmamap_t, int, int *); 101 102 struct x86_bus_dma_tag isa_bus_dma_tag = { 103 ._tag_needs_free = 0, 104 ._bounce_thresh = ISA_DMA_BOUNCE_THRESHOLD, 105 ._bounce_alloc_lo = 0, 106 ._bounce_alloc_hi = ISA_DMA_BOUNCE_THRESHOLD, 107 ._may_bounce = _isa_dma_may_bounce, 108 }; 109 110 #define IDTVEC(name) __CONCAT(X,name) 111 typedef void (vector)(void); 112 extern vector *IDTVEC(intr)[]; 113 114 #define LEGAL_IRQ(x) ((x) >= 0 && (x) < NUM_LEGACY_IRQS && (x) != 2) 115 116 int 117 isa_intr_alloc(isa_chipset_tag_t ic, int mask, int type, int *irq) 118 { 119 int i, tmp, bestirq, count; 120 struct intrhand **p, *q; 121 struct intrsource *isp; 122 struct cpu_info *ci; 123 124 if (type == IST_NONE) 125 panic("intr_alloc: bogus type"); 126 127 ci = &cpu_info_primary; 128 129 bestirq = -1; 130 count = -1; 131 132 /* some interrupts should never be dynamically allocated */ 133 mask &= 0xdef8; 134 135 /* 136 * XXX some interrupts will be used later (6 for fdc, 12 for pms). 137 * the right answer is to do "breadth-first" searching of devices. 138 */ 139 mask &= 0xefbf; 140 141 mutex_enter(&cpu_lock); 142 143 for (i = 0; i < NUM_LEGACY_IRQS; i++) { 144 if (LEGAL_IRQ(i) == 0 || (mask & (1<<i)) == 0) 145 continue; 146 isp = ci->ci_isources[i]; 147 if (isp == NULL) { 148 /* if nothing's using the irq, just return it */ 149 *irq = i; 150 mutex_exit(&cpu_lock); 151 return 0; 152 } 153 154 switch(isp->is_type) { 155 case IST_EDGE: 156 case IST_LEVEL: 157 if (type != isp->is_type) 158 continue; 159 /* 160 * if the irq is shareable, count the number of other 161 * handlers, and if it's smaller than the last irq like 162 * this, remember it 163 * 164 * XXX We should probably also consider the 165 * interrupt level and stick IPL_TTY with other 166 * IPL_TTY, etc. 167 */ 168 for (p = &isp->is_handlers, tmp = 0; (q = *p) != NULL; 169 p = &q->ih_next, tmp++) 170 ; 171 if ((bestirq == -1) || (count > tmp)) { 172 bestirq = i; 173 count = tmp; 174 } 175 break; 176 case IST_PULSE: 177 /* this just isn't shareable */ 178 continue; 179 } 180 } 181 182 mutex_exit(&cpu_lock); 183 184 if (bestirq == -1) 185 return 1; 186 187 *irq = bestirq; 188 189 return 0; 190 } 191 192 const struct evcnt * 193 isa_intr_evcnt(isa_chipset_tag_t ic, int irq) 194 { 195 /* XXX for now, no evcnt parent reported */ 196 return NULL; 197 } 198 199 void * 200 isa_intr_establish(isa_chipset_tag_t ic, int irq, int type, int level, 201 int (*ih_fun)(void *), void *ih_arg) 202 { 203 return isa_intr_establish_xname(ic, irq, type, level, 204 ih_fun, ih_arg, "unknown"); 205 } 206 207 void * 208 isa_intr_establish_xname(isa_chipset_tag_t ic, int irq, int type, int level, 209 int (*ih_fun)(void *), void *ih_arg, const char *xname) 210 { 211 struct pic *pic; 212 int pin; 213 intr_handle_t mpih = 0; 214 #if NIOAPIC > 0 215 struct ioapic_softc *ioapic = NULL; 216 #endif 217 218 pin = irq; 219 pic = &i8259_pic; 220 221 #if NIOAPIC > 0 222 if (mp_busses != NULL) { 223 if (intr_find_mpmapping(mp_isa_bus, irq, &mpih) == 0 || 224 intr_find_mpmapping(mp_eisa_bus, irq, &mpih) == 0) { 225 if (!APIC_IRQ_ISLEGACY(mpih)) { 226 pin = APIC_IRQ_PIN(mpih); 227 ioapic = ioapic_find(APIC_IRQ_APIC(mpih)); 228 if (ioapic == NULL) { 229 printf("isa_intr_establish: " 230 "unknown apic %d\n", 231 APIC_IRQ_APIC(mpih)); 232 return NULL; 233 } 234 pic = &ioapic->sc_pic; 235 } 236 } else 237 printf("isa_intr_establish: no MP mapping found\n"); 238 } 239 #endif 240 #if defined(XEN) 241 KASSERT(APIC_IRQ_ISLEGACY(irq)); 242 243 int evtch; 244 char evname[16]; 245 246 mpih |= APIC_IRQ_LEGACY_IRQ(irq); 247 248 evtch = xen_pirq_alloc(&mpih, type); /* XXX: legacy - xen just tosses irq back at us */ 249 if (evtch == -1) 250 return NULL; 251 #if NIOAPIC > 0 252 if (ioapic) 253 snprintf(evname, sizeof(evname), "%s pin %d", 254 device_xname(ioapic->sc_dev), pin); 255 else 256 #endif 257 snprintf(evname, sizeof(evname), "irq%d", irq); 258 259 aprint_debug("irq: %d requested on pic: %s.\n", irq, pic->pic_name); 260 261 return (void *)pirq_establish(irq, evtch, ih_fun, ih_arg, level, 262 evname); 263 #else /* defined(XEN) */ 264 return intr_establish_xname(irq, pic, pin, type, level, ih_fun, ih_arg, 265 false, xname); 266 #endif 267 268 } 269 270 /* Deregister an interrupt handler. */ 271 void 272 isa_intr_disestablish(isa_chipset_tag_t ic, void *arg) 273 { 274 #if !defined(XEN) 275 struct intrhand *ih = arg; 276 277 if (!LEGAL_IRQ(ih->ih_pin)) 278 panic("intr_disestablish: bogus irq"); 279 280 intr_disestablish(ih); 281 #endif 282 } 283 284 void 285 isa_attach_hook(device_t parent, device_t self, struct isabus_attach_args *iba) 286 { 287 extern struct x86_isa_chipset x86_isa_chipset; 288 extern int isa_has_been_seen; 289 290 /* 291 * Notify others that might need to know that the ISA bus 292 * has now been attached. 293 */ 294 if (isa_has_been_seen) 295 panic("isaattach: ISA bus already seen!"); 296 isa_has_been_seen = 1; 297 298 /* 299 * Since we can only have one ISA bus, we just use a single 300 * statically allocated ISA chipset structure. Pass it up 301 * now. 302 */ 303 iba->iba_ic = &x86_isa_chipset; 304 } 305 306 void 307 isa_detach_hook(isa_chipset_tag_t ic, device_t self) 308 { 309 extern int isa_has_been_seen; 310 311 isa_has_been_seen = 0; 312 } 313 314 int 315 isa_mem_alloc(bus_space_tag_t t, bus_size_t size, bus_size_t align, 316 bus_addr_t boundary, int flags, bus_addr_t *addrp, bus_space_handle_t *bshp) 317 { 318 /* Allocate physical address space in the ISA hole. */ 319 return bus_space_alloc(t, IOM_BEGIN, IOM_END - 1, size, align, 320 boundary, flags, addrp, bshp); 321 } 322 323 void 324 isa_mem_free(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size) 325 { 326 bus_space_free(t, bsh, size); 327 } 328 329 /* 330 * ISA only has 24-bits of address space. This means 331 * we can't DMA to pages over 16M. In order to DMA to 332 * arbitrary buffers, we use "bounce buffers" - pages 333 * in memory below the 16M boundary. On DMA reads, 334 * DMA happens to the bounce buffers, and is copied into 335 * the caller's buffer. On writes, data is copied into 336 * but bounce buffer, and the DMA happens from those 337 * pages. To software using the DMA mapping interface, 338 * this looks simply like a data cache. 339 * 340 * If we have more than 16M of RAM in the system, we may 341 * need bounce buffers. We check and remember that here. 342 * 343 * There are exceptions, however. VLB devices can do 344 * 32-bit DMA, and indicate that here. 345 * 346 * ...or, there is an opposite case. The most segments 347 * a transfer will require is (maxxfer / PAGE_SIZE) + 1. If 348 * the caller can't handle that many segments (e.g. the 349 * ISA DMA controller), we may have to bounce it as well. 350 */ 351 static int 352 _isa_dma_may_bounce(bus_dma_tag_t t, bus_dmamap_t map, int flags, 353 int *cookieflagsp) 354 { 355 if ((flags & ISABUS_DMA_32BIT) != 0) 356 map->_dm_bounce_thresh = 0; 357 358 if (((map->_dm_size / PAGE_SIZE) + 1) > map->_dm_segcnt) 359 *cookieflagsp |= X86_DMA_MIGHT_NEED_BOUNCE; 360 return 0; 361 } 362 363 device_t 364 device_isa_register(device_t dev, void *aux) 365 { 366 /* 367 * Handle network interfaces here, the attachment information is 368 * not available driver-independently later. 369 * 370 * For disks, there is nothing useful available at attach time. 371 */ 372 if (device_class(dev) == DV_IFNET) { 373 struct btinfo_netif *bin = lookup_bootinfo(BTINFO_NETIF); 374 if (bin == NULL) 375 return NULL; 376 377 /* 378 * We don't check the driver name against the device name 379 * passed by the boot ROM. The ROM should stay usable if 380 * the driver becomes obsolete. The physical attachment 381 * information (checked below) must be sufficient to 382 * identify the device. 383 */ 384 if (bin->bus == BI_BUS_ISA && 385 device_is_a(device_parent(dev), "isa")) { 386 struct isa_attach_args *iaa = aux; 387 388 /* Compare IO base address */ 389 /* XXXJRT What about multiple IO addrs? */ 390 if (iaa->ia_nio > 0 && 391 bin->addr.iobase == iaa->ia_io[0].ir_addr) 392 return dev; 393 } 394 } 395 #if NACPICA > 0 396 #if notyet 397 if (device_is_a(dev, "isa") && acpi_active) { 398 if (!(AcpiGbl_FADT.BootFlags & ACPI_FADT_LEGACY_DEVICES)) 399 prop_dictionary_set_bool(device_properties(dev), 400 "no-legacy-devices", true); 401 } 402 #endif 403 #endif /* NACPICA > 0 */ 404 return NULL; 405 } 406