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 DEFINE_CLASS_1(pcib, grackle_driver, grackle_methods, 102 sizeof(struct grackle_softc), ofw_pcib_driver); 103 DRIVER_MODULE(grackle, ofwbus, grackle_driver, 0, 0); 104 105 static int 106 grackle_probe(device_t dev) 107 { 108 const char *type, *compatible; 109 110 type = ofw_bus_get_type(dev); 111 compatible = ofw_bus_get_compat(dev); 112 113 if (type == NULL || compatible == NULL) 114 return (ENXIO); 115 116 if (strcmp(type, "pci") != 0 || strcmp(compatible, "grackle") != 0) 117 return (ENXIO); 118 119 device_set_desc(dev, "MPC106 (Grackle) Host-PCI bridge"); 120 return (0); 121 } 122 123 static int 124 grackle_attach(device_t dev) 125 { 126 struct grackle_softc *sc; 127 128 sc = device_get_softc(dev); 129 130 /* 131 * The Grackle PCI config addr/data registers are actually in 132 * PCI space, but since they are needed to actually probe the 133 * PCI bus, use the fact that they are also available directly 134 * on the processor bus and map them 135 */ 136 sc->sc_addr = (vm_offset_t)pmap_mapdev(GRACKLE_ADDR, PAGE_SIZE); 137 sc->sc_data = (vm_offset_t)pmap_mapdev(GRACKLE_DATA, PAGE_SIZE); 138 139 return (ofw_pcib_attach(dev)); 140 } 141 142 static u_int32_t 143 grackle_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg, 144 int width) 145 { 146 struct grackle_softc *sc; 147 vm_offset_t caoff; 148 u_int32_t retval = 0xffffffff; 149 150 sc = device_get_softc(dev); 151 caoff = sc->sc_data + (reg & 0x03); 152 153 if (grackle_enable_config(sc, bus, slot, func, reg) != 0) { 154 /* 155 * Config probes to non-existent devices on the 156 * secondary bus generates machine checks. Be sure 157 * to catch these. 158 */ 159 if (bus > 0) { 160 if (badaddr((void *)sc->sc_data, 4)) { 161 return (retval); 162 } 163 } 164 165 switch (width) { 166 case 1: 167 retval = (in8rb(caoff)); 168 break; 169 case 2: 170 retval = (in16rb(caoff)); 171 break; 172 case 4: 173 retval = (in32rb(caoff)); 174 break; 175 } 176 } 177 grackle_disable_config(sc); 178 179 return (retval); 180 } 181 182 static void 183 grackle_write_config(device_t dev, u_int bus, u_int slot, u_int func, 184 u_int reg, u_int32_t val, int width) 185 { 186 struct grackle_softc *sc; 187 vm_offset_t caoff; 188 189 sc = device_get_softc(dev); 190 caoff = sc->sc_data + (reg & 0x03); 191 192 if (grackle_enable_config(sc, bus, slot, func, reg)) { 193 switch (width) { 194 case 1: 195 out8rb(caoff, val); 196 (void)in8rb(caoff); 197 break; 198 case 2: 199 out16rb(caoff, val); 200 (void)in16rb(caoff); 201 break; 202 case 4: 203 out32rb(caoff, val); 204 (void)in32rb(caoff); 205 break; 206 } 207 } 208 grackle_disable_config(sc); 209 } 210 211 static int 212 grackle_enable_config(struct grackle_softc *sc, u_int bus, u_int slot, 213 u_int func, u_int reg) 214 { 215 u_int32_t cfgval; 216 217 /* 218 * Unlike UniNorth, the format of the config word is the same 219 * for local (0) and remote busses. 220 */ 221 cfgval = (bus << 16) | (slot << 11) | (func << 8) | (reg & 0xFC) 222 | GRACKLE_CFG_ENABLE; 223 224 out32rb(sc->sc_addr, cfgval); 225 (void) in32rb(sc->sc_addr); 226 227 return (1); 228 } 229 230 static void 231 grackle_disable_config(struct grackle_softc *sc) 232 { 233 /* 234 * Clear the GRACKLE_CFG_ENABLE bit to prevent stray 235 * accesses from causing config cycles 236 */ 237 out32rb(sc->sc_addr, 0); 238 } 239 240 static int 241 badaddr(void *addr, size_t size) 242 { 243 struct thread *td; 244 jmp_buf env, *oldfaultbuf; 245 246 /* Get rid of any stale machine checks that have been waiting. */ 247 __asm __volatile ("sync; isync"); 248 249 td = curthread; 250 251 oldfaultbuf = td->td_pcb->pcb_onfault; 252 td->td_pcb->pcb_onfault = &env; 253 if (setjmp(env)) { 254 td->td_pcb->pcb_onfault = oldfaultbuf; 255 __asm __volatile ("sync"); 256 return 1; 257 } 258 259 __asm __volatile ("sync"); 260 261 switch (size) { 262 case 1: 263 (void)*(volatile int8_t *)addr; 264 break; 265 case 2: 266 (void)*(volatile int16_t *)addr; 267 break; 268 case 4: 269 (void)*(volatile int32_t *)addr; 270 break; 271 default: 272 panic("badaddr: invalid size (%zd)", size); 273 } 274 275 /* Make sure we took the machine check, if we caused one. */ 276 __asm __volatile ("sync; isync"); 277 278 td->td_pcb->pcb_onfault = oldfaultbuf; 279 __asm __volatile ("sync"); /* To be sure. */ 280 281 return (0); 282 } 283 284 /* 285 * Driver to swallow Grackle host bridges from the PCI bus side. 286 */ 287 static int 288 grackle_hb_probe(device_t dev) 289 { 290 291 if (pci_get_devid(dev) == 0x00021057) { 292 device_set_desc(dev, "Grackle Host to PCI bridge"); 293 device_quiet(dev); 294 return (0); 295 } 296 297 return (ENXIO); 298 } 299 300 static int 301 grackle_hb_attach(device_t dev) 302 { 303 304 return (0); 305 } 306 307 static device_method_t grackle_hb_methods[] = { 308 /* Device interface */ 309 DEVMETHOD(device_probe, grackle_hb_probe), 310 DEVMETHOD(device_attach, grackle_hb_attach), 311 { 0, 0 } 312 }; 313 314 static driver_t grackle_hb_driver = { 315 "grackle_hb", 316 grackle_hb_methods, 317 1, 318 }; 319 320 DRIVER_MODULE(grackle_hb, pci, grackle_hb_driver, 0, 0); 321