1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright 2003 by Peter Grehan. 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. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 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, 22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/module.h> 36 #include <sys/bus.h> 37 #include <sys/conf.h> 38 #include <sys/kernel.h> 39 #include <sys/proc.h> 40 #include <sys/rman.h> 41 42 #include <dev/ofw/openfirm.h> 43 #include <dev/ofw/ofw_pci.h> 44 #include <dev/ofw/ofw_bus.h> 45 #include <dev/ofw/ofw_bus_subr.h> 46 #include <dev/ofw/ofwpci.h> 47 48 #include <dev/pci/pcivar.h> 49 #include <dev/pci/pcireg.h> 50 51 #include <machine/bus.h> 52 #include <machine/intr_machdep.h> 53 #include <machine/md_var.h> 54 #include <machine/pio.h> 55 #include <machine/resource.h> 56 57 #include <powerpc/powermac/gracklevar.h> 58 59 #include <vm/vm.h> 60 #include <vm/pmap.h> 61 62 #include "pcib_if.h" 63 64 /* 65 * Device interface. 66 */ 67 static int grackle_probe(device_t); 68 static int grackle_attach(device_t); 69 70 /* 71 * pcib interface. 72 */ 73 static u_int32_t grackle_read_config(device_t, u_int, u_int, u_int, 74 u_int, int); 75 static void grackle_write_config(device_t, u_int, u_int, u_int, 76 u_int, u_int32_t, int); 77 78 /* 79 * Local routines. 80 */ 81 static int grackle_enable_config(struct grackle_softc *, u_int, 82 u_int, u_int, u_int); 83 static void grackle_disable_config(struct grackle_softc *); 84 static int badaddr(void *, size_t); 85 86 /* 87 * Driver methods. 88 */ 89 static device_method_t grackle_methods[] = { 90 /* Device interface */ 91 DEVMETHOD(device_probe, grackle_probe), 92 DEVMETHOD(device_attach, grackle_attach), 93 94 /* pcib interface */ 95 DEVMETHOD(pcib_read_config, grackle_read_config), 96 DEVMETHOD(pcib_write_config, grackle_write_config), 97 98 DEVMETHOD_END 99 }; 100 101 static devclass_t grackle_devclass; 102 DEFINE_CLASS_1(pcib, grackle_driver, grackle_methods, 103 sizeof(struct grackle_softc), ofw_pci_driver); 104 DRIVER_MODULE(grackle, ofwbus, grackle_driver, grackle_devclass, 0, 0); 105 106 static int 107 grackle_probe(device_t dev) 108 { 109 const char *type, *compatible; 110 111 type = ofw_bus_get_type(dev); 112 compatible = ofw_bus_get_compat(dev); 113 114 if (type == NULL || compatible == NULL) 115 return (ENXIO); 116 117 if (strcmp(type, "pci") != 0 || strcmp(compatible, "grackle") != 0) 118 return (ENXIO); 119 120 device_set_desc(dev, "MPC106 (Grackle) Host-PCI bridge"); 121 return (0); 122 } 123 124 static int 125 grackle_attach(device_t dev) 126 { 127 struct grackle_softc *sc; 128 129 sc = device_get_softc(dev); 130 131 /* 132 * The Grackle PCI config addr/data registers are actually in 133 * PCI space, but since they are needed to actually probe the 134 * PCI bus, use the fact that they are also available directly 135 * on the processor bus and map them 136 */ 137 sc->sc_addr = (vm_offset_t)pmap_mapdev(GRACKLE_ADDR, PAGE_SIZE); 138 sc->sc_data = (vm_offset_t)pmap_mapdev(GRACKLE_DATA, PAGE_SIZE); 139 140 return (ofw_pci_attach(dev)); 141 } 142 143 static u_int32_t 144 grackle_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg, 145 int width) 146 { 147 struct grackle_softc *sc; 148 vm_offset_t caoff; 149 u_int32_t retval = 0xffffffff; 150 151 sc = device_get_softc(dev); 152 caoff = sc->sc_data + (reg & 0x03); 153 154 if (grackle_enable_config(sc, bus, slot, func, reg) != 0) { 155 156 /* 157 * Config probes to non-existent devices on the 158 * secondary bus generates machine checks. Be sure 159 * to catch these. 160 */ 161 if (bus > 0) { 162 if (badaddr((void *)sc->sc_data, 4)) { 163 return (retval); 164 } 165 } 166 167 switch (width) { 168 case 1: 169 retval = (in8rb(caoff)); 170 break; 171 case 2: 172 retval = (in16rb(caoff)); 173 break; 174 case 4: 175 retval = (in32rb(caoff)); 176 break; 177 } 178 } 179 grackle_disable_config(sc); 180 181 return (retval); 182 } 183 184 static void 185 grackle_write_config(device_t dev, u_int bus, u_int slot, u_int func, 186 u_int reg, u_int32_t val, int width) 187 { 188 struct grackle_softc *sc; 189 vm_offset_t caoff; 190 191 sc = device_get_softc(dev); 192 caoff = sc->sc_data + (reg & 0x03); 193 194 if (grackle_enable_config(sc, bus, slot, func, reg)) { 195 switch (width) { 196 case 1: 197 out8rb(caoff, val); 198 (void)in8rb(caoff); 199 break; 200 case 2: 201 out16rb(caoff, val); 202 (void)in16rb(caoff); 203 break; 204 case 4: 205 out32rb(caoff, val); 206 (void)in32rb(caoff); 207 break; 208 } 209 } 210 grackle_disable_config(sc); 211 } 212 213 static int 214 grackle_enable_config(struct grackle_softc *sc, u_int bus, u_int slot, 215 u_int func, u_int reg) 216 { 217 u_int32_t cfgval; 218 219 /* 220 * Unlike UniNorth, the format of the config word is the same 221 * for local (0) and remote busses. 222 */ 223 cfgval = (bus << 16) | (slot << 11) | (func << 8) | (reg & 0xFC) 224 | GRACKLE_CFG_ENABLE; 225 226 out32rb(sc->sc_addr, cfgval); 227 (void) in32rb(sc->sc_addr); 228 229 return (1); 230 } 231 232 static void 233 grackle_disable_config(struct grackle_softc *sc) 234 { 235 /* 236 * Clear the GRACKLE_CFG_ENABLE bit to prevent stray 237 * accesses from causing config cycles 238 */ 239 out32rb(sc->sc_addr, 0); 240 } 241 242 static int 243 badaddr(void *addr, size_t size) 244 { 245 struct thread *td; 246 jmp_buf env, *oldfaultbuf; 247 int x; 248 249 /* Get rid of any stale machine checks that have been waiting. */ 250 __asm __volatile ("sync; isync"); 251 252 td = curthread; 253 254 oldfaultbuf = td->td_pcb->pcb_onfault; 255 td->td_pcb->pcb_onfault = &env; 256 if (setjmp(env)) { 257 td->td_pcb->pcb_onfault = oldfaultbuf; 258 __asm __volatile ("sync"); 259 return 1; 260 } 261 262 __asm __volatile ("sync"); 263 264 switch (size) { 265 case 1: 266 x = *(volatile int8_t *)addr; 267 break; 268 case 2: 269 x = *(volatile int16_t *)addr; 270 break; 271 case 4: 272 x = *(volatile int32_t *)addr; 273 break; 274 default: 275 panic("badaddr: invalid size (%zd)", size); 276 } 277 278 /* Make sure we took the machine check, if we caused one. */ 279 __asm __volatile ("sync; isync"); 280 281 td->td_pcb->pcb_onfault = oldfaultbuf; 282 __asm __volatile ("sync"); /* To be sure. */ 283 284 return (0); 285 } 286 287 /* 288 * Driver to swallow Grackle host bridges from the PCI bus side. 289 */ 290 static int 291 grackle_hb_probe(device_t dev) 292 { 293 294 if (pci_get_devid(dev) == 0x00021057) { 295 device_set_desc(dev, "Grackle Host to PCI bridge"); 296 device_quiet(dev); 297 return (0); 298 } 299 300 return (ENXIO); 301 } 302 303 static int 304 grackle_hb_attach(device_t dev) 305 { 306 307 return (0); 308 } 309 310 static device_method_t grackle_hb_methods[] = { 311 /* Device interface */ 312 DEVMETHOD(device_probe, grackle_hb_probe), 313 DEVMETHOD(device_attach, grackle_hb_attach), 314 315 { 0, 0 } 316 }; 317 318 static driver_t grackle_hb_driver = { 319 "grackle_hb", 320 grackle_hb_methods, 321 1, 322 }; 323 static devclass_t grackle_hb_devclass; 324 325 DRIVER_MODULE(grackle_hb, pci, grackle_hb_driver, grackle_hb_devclass, 0, 0); 326