1 /*- 2 * Copyright 2003 by Peter Grehan. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. The name of the author may not be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/module.h> 34 #include <sys/bus.h> 35 #include <sys/conf.h> 36 #include <sys/kernel.h> 37 #include <sys/proc.h> 38 #include <sys/rman.h> 39 40 #include <dev/ofw/openfirm.h> 41 #include <dev/ofw/ofw_pci.h> 42 #include <dev/ofw/ofw_bus.h> 43 #include <dev/ofw/ofw_bus_subr.h> 44 #include <dev/ofw/ofwpci.h> 45 46 #include <dev/pci/pcivar.h> 47 #include <dev/pci/pcireg.h> 48 49 #include <machine/bus.h> 50 #include <machine/intr_machdep.h> 51 #include <machine/md_var.h> 52 #include <machine/pio.h> 53 #include <machine/resource.h> 54 55 #include <powerpc/powermac/gracklevar.h> 56 57 #include <vm/vm.h> 58 #include <vm/pmap.h> 59 60 #include "pcib_if.h" 61 62 /* 63 * Device interface. 64 */ 65 static int grackle_probe(device_t); 66 static int grackle_attach(device_t); 67 68 /* 69 * pcib interface. 70 */ 71 static u_int32_t grackle_read_config(device_t, u_int, u_int, u_int, 72 u_int, int); 73 static void grackle_write_config(device_t, u_int, u_int, u_int, 74 u_int, u_int32_t, int); 75 76 /* 77 * Local routines. 78 */ 79 static int grackle_enable_config(struct grackle_softc *, u_int, 80 u_int, u_int, u_int); 81 static void grackle_disable_config(struct grackle_softc *); 82 static int badaddr(void *, size_t); 83 84 /* 85 * Driver methods. 86 */ 87 static device_method_t grackle_methods[] = { 88 /* Device interface */ 89 DEVMETHOD(device_probe, grackle_probe), 90 DEVMETHOD(device_attach, grackle_attach), 91 92 /* pcib interface */ 93 DEVMETHOD(pcib_read_config, grackle_read_config), 94 DEVMETHOD(pcib_write_config, grackle_write_config), 95 96 DEVMETHOD_END 97 }; 98 99 static devclass_t grackle_devclass; 100 DEFINE_CLASS_1(pcib, grackle_driver, grackle_methods, 101 sizeof(struct grackle_softc), ofw_pci_driver); 102 DRIVER_MODULE(grackle, ofwbus, grackle_driver, grackle_devclass, 0, 0); 103 104 static int 105 grackle_probe(device_t dev) 106 { 107 const char *type, *compatible; 108 109 type = ofw_bus_get_type(dev); 110 compatible = ofw_bus_get_compat(dev); 111 112 if (type == NULL || compatible == NULL) 113 return (ENXIO); 114 115 if (strcmp(type, "pci") != 0 || strcmp(compatible, "grackle") != 0) 116 return (ENXIO); 117 118 device_set_desc(dev, "MPC106 (Grackle) Host-PCI bridge"); 119 return (0); 120 } 121 122 static int 123 grackle_attach(device_t dev) 124 { 125 struct grackle_softc *sc; 126 127 sc = device_get_softc(dev); 128 129 /* 130 * The Grackle PCI config addr/data registers are actually in 131 * PCI space, but since they are needed to actually probe the 132 * PCI bus, use the fact that they are also available directly 133 * on the processor bus and map them 134 */ 135 sc->sc_addr = (vm_offset_t)pmap_mapdev(GRACKLE_ADDR, PAGE_SIZE); 136 sc->sc_data = (vm_offset_t)pmap_mapdev(GRACKLE_DATA, PAGE_SIZE); 137 138 return (ofw_pci_attach(dev)); 139 } 140 141 static u_int32_t 142 grackle_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg, 143 int width) 144 { 145 struct grackle_softc *sc; 146 vm_offset_t caoff; 147 u_int32_t retval = 0xffffffff; 148 149 sc = device_get_softc(dev); 150 caoff = sc->sc_data + (reg & 0x03); 151 152 if (grackle_enable_config(sc, bus, slot, func, reg) != 0) { 153 154 /* 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 int x; 246 247 /* Get rid of any stale machine checks that have been waiting. */ 248 __asm __volatile ("sync; isync"); 249 250 td = curthread; 251 252 oldfaultbuf = td->td_pcb->pcb_onfault; 253 td->td_pcb->pcb_onfault = &env; 254 if (setjmp(env)) { 255 td->td_pcb->pcb_onfault = oldfaultbuf; 256 __asm __volatile ("sync"); 257 return 1; 258 } 259 260 __asm __volatile ("sync"); 261 262 switch (size) { 263 case 1: 264 x = *(volatile int8_t *)addr; 265 break; 266 case 2: 267 x = *(volatile int16_t *)addr; 268 break; 269 case 4: 270 x = *(volatile int32_t *)addr; 271 break; 272 default: 273 panic("badaddr: invalid size (%zd)", size); 274 } 275 276 /* Make sure we took the machine check, if we caused one. */ 277 __asm __volatile ("sync; isync"); 278 279 td->td_pcb->pcb_onfault = oldfaultbuf; 280 __asm __volatile ("sync"); /* To be sure. */ 281 282 return (0); 283 } 284 285 /* 286 * Driver to swallow Grackle host bridges from the PCI bus side. 287 */ 288 static int 289 grackle_hb_probe(device_t dev) 290 { 291 292 if (pci_get_devid(dev) == 0x00021057) { 293 device_set_desc(dev, "Grackle Host to PCI bridge"); 294 device_quiet(dev); 295 return (0); 296 } 297 298 return (ENXIO); 299 } 300 301 static int 302 grackle_hb_attach(device_t dev) 303 { 304 305 return (0); 306 } 307 308 static device_method_t grackle_hb_methods[] = { 309 /* Device interface */ 310 DEVMETHOD(device_probe, grackle_hb_probe), 311 DEVMETHOD(device_attach, grackle_hb_attach), 312 313 { 0, 0 } 314 }; 315 316 static driver_t grackle_hb_driver = { 317 "grackle_hb", 318 grackle_hb_methods, 319 1, 320 }; 321 static devclass_t grackle_hb_devclass; 322 323 DRIVER_MODULE(grackle_hb, pci, grackle_hb_driver, grackle_hb_devclass, 0, 0); 324