apb.c revision 190099
1/*- 2 * Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier 3 * Copyright (c) 2000 Michael Smith <msmith@freebsd.org> 4 * Copyright (c) 2000 BSDi 5 * Copyright (c) 2001, 2003 Thomas Moestl <tmm@FreeBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * from: FreeBSD: src/sys/dev/pci/pci_pci.c,v 1.3 2000/12/13 32 */ 33 34#include <sys/cdefs.h> 35__FBSDID("$FreeBSD: head/sys/sparc64/pci/apb.c 190099 2009-03-19 20:31:55Z marius $"); 36 37/* 38 * Support for the Sun APB (Advanced PCI Bridge) PCI-PCI bridge. 39 * This bridge does not fully comply to the PCI bridge specification, and is 40 * therefore not supported by the generic driver. 41 * We can use some of the pcib methods anyway. 42 */ 43 44#include "opt_ofw_pci.h" 45 46#include <sys/param.h> 47#include <sys/systm.h> 48#include <sys/kernel.h> 49#include <sys/module.h> 50#include <sys/bus.h> 51 52#include <dev/ofw/ofw_bus.h> 53#include <dev/ofw/openfirm.h> 54 55#include <machine/bus.h> 56#include <machine/resource.h> 57 58#include <dev/pci/pcireg.h> 59#include <dev/pci/pcivar.h> 60#include <dev/pci/pcib_private.h> 61 62#include "pcib_if.h" 63 64#include <sparc64/pci/ofw_pci.h> 65#include <sparc64/pci/ofw_pcib_subr.h> 66 67/* 68 * Bridge-specific data. 69 */ 70struct apb_softc { 71 struct ofw_pcib_gen_softc sc_bsc; 72 uint8_t sc_iomap; 73 uint8_t sc_memmap; 74}; 75 76static device_probe_t apb_probe; 77static device_attach_t apb_attach; 78static bus_alloc_resource_t apb_alloc_resource; 79 80static device_method_t apb_methods[] = { 81 /* Device interface */ 82 DEVMETHOD(device_probe, apb_probe), 83 DEVMETHOD(device_attach, apb_attach), 84 DEVMETHOD(device_shutdown, bus_generic_shutdown), 85 DEVMETHOD(device_suspend, bus_generic_suspend), 86 DEVMETHOD(device_resume, bus_generic_resume), 87 88 /* Bus interface */ 89 DEVMETHOD(bus_print_child, bus_generic_print_child), 90 DEVMETHOD(bus_read_ivar, pcib_read_ivar), 91 DEVMETHOD(bus_write_ivar, pcib_write_ivar), 92 DEVMETHOD(bus_alloc_resource, apb_alloc_resource), 93 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 94 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 95 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 96 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 97 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 98 99 /* pcib interface */ 100 DEVMETHOD(pcib_maxslots, pcib_maxslots), 101 DEVMETHOD(pcib_read_config, pcib_read_config), 102 DEVMETHOD(pcib_write_config, pcib_write_config), 103 DEVMETHOD(pcib_route_interrupt, ofw_pcib_gen_route_interrupt), 104 105 /* ofw_bus interface */ 106 DEVMETHOD(ofw_bus_get_node, ofw_pcib_gen_get_node), 107 108 KOBJMETHOD_END 109}; 110 111static devclass_t pcib_devclass; 112 113DEFINE_CLASS_0(pcib, apb_driver, apb_methods, sizeof(struct apb_softc)); 114DRIVER_MODULE(apb, pci, apb_driver, pcib_devclass, 0, 0); 115 116/* APB specific registers */ 117#define APBR_IOMAP 0xde 118#define APBR_MEMMAP 0xdf 119 120/* Definitions for the mapping registers */ 121#define APB_IO_SCALE 0x200000 122#define APB_MEM_SCALE 0x20000000 123 124/* 125 * Generic device interface 126 */ 127static int 128apb_probe(device_t dev) 129{ 130 131 if (pci_get_vendor(dev) == 0x108e && /* Sun */ 132 pci_get_device(dev) == 0x5000) { /* APB */ 133 device_set_desc(dev, "APB PCI-PCI bridge"); 134 return (0); 135 } 136 return (ENXIO); 137} 138 139static void 140apb_map_print(uint8_t map, u_long scale) 141{ 142 int i, first; 143 144 for (first = 1, i = 0; i < 8; i++) { 145 if ((map & (1 << i)) != 0) { 146 printf("%s0x%lx-0x%lx", first ? "" : ", ", 147 i * scale, (i + 1) * scale - 1); 148 first = 0; 149 } 150 } 151} 152 153static int 154apb_checkrange(uint8_t map, u_long scale, u_long start, u_long end) 155{ 156 int i, ei; 157 158 i = start / scale; 159 ei = end / scale; 160 if (i > 7 || ei > 7) 161 return (0); 162 for (; i <= ei; i++) 163 if ((map & (1 << i)) == 0) 164 return (0); 165 return (1); 166} 167 168static int 169apb_attach(device_t dev) 170{ 171 struct apb_softc *sc; 172 173 sc = device_get_softc(dev); 174 175 /* 176 * Get current bridge configuration. 177 */ 178 sc->sc_bsc.ops_pcib_sc.domain = pci_get_domain(dev); 179 sc->sc_bsc.ops_pcib_sc.secbus = 180 pci_read_config(dev, PCIR_SECBUS_1, 1); 181 sc->sc_bsc.ops_pcib_sc.subbus = 182 pci_read_config(dev, PCIR_SUBBUS_1, 1); 183 sc->sc_iomap = pci_read_config(dev, APBR_IOMAP, 1); 184 sc->sc_memmap = pci_read_config(dev, APBR_MEMMAP, 1); 185 ofw_pcib_gen_setup(dev); 186 187 if (bootverbose) { 188 device_printf(dev, " domain %d\n", 189 sc->sc_bsc.ops_pcib_sc.domain); 190 device_printf(dev, " secondary bus %d\n", 191 sc->sc_bsc.ops_pcib_sc.secbus); 192 device_printf(dev, " subordinate bus %d\n", 193 sc->sc_bsc.ops_pcib_sc.subbus); 194 device_printf(dev, " I/O decode "); 195 apb_map_print(sc->sc_iomap, APB_IO_SCALE); 196 printf("\n"); 197 device_printf(dev, " memory decode "); 198 apb_map_print(sc->sc_memmap, APB_MEM_SCALE); 199 printf("\n"); 200 } 201 202 device_add_child(dev, "pci", -1); 203 return (bus_generic_attach(dev)); 204} 205 206/* 207 * We have to trap resource allocation requests and ensure that the bridge 208 * is set up to, or capable of handling them. 209 */ 210static struct resource * 211apb_alloc_resource(device_t dev, device_t child, int type, int *rid, 212 u_long start, u_long end, u_long count, u_int flags) 213{ 214 struct apb_softc *sc; 215 216 sc = device_get_softc(dev); 217 218 /* 219 * If this is a "default" allocation against this rid, we can't work 220 * out where it's coming from (we should actually never see these) so 221 * we just have to punt. 222 */ 223 if (start == 0 && end == ~0) { 224 device_printf(dev, "can't decode default resource id %d for " 225 "%s%d, bypassing\n", *rid, device_get_name(child), 226 device_get_unit(child)); 227 goto passup; 228 } 229 230 /* 231 * Fail the allocation for this range if it's not supported. 232 * XXX we should probably just fix up the bridge decode and 233 * soldier on. 234 */ 235 switch (type) { 236 case SYS_RES_IOPORT: 237 if (!apb_checkrange(sc->sc_iomap, APB_IO_SCALE, start, end)) { 238 device_printf(dev, "device %s%d requested unsupported " 239 "I/O range 0x%lx-0x%lx\n", device_get_name(child), 240 device_get_unit(child), start, end); 241 return (NULL); 242 } 243 if (bootverbose) 244 device_printf(sc->sc_bsc.ops_pcib_sc.dev, "device " 245 "%s%d requested decoded I/O range 0x%lx-0x%lx\n", 246 device_get_name(child), device_get_unit(child), 247 start, end); 248 break; 249 250 case SYS_RES_MEMORY: 251 if (!apb_checkrange(sc->sc_memmap, APB_MEM_SCALE, start, end)) { 252 device_printf(dev, "device %s%d requested unsupported " 253 "memory range 0x%lx-0x%lx\n", 254 device_get_name(child), device_get_unit(child), 255 start, end); 256 return (NULL); 257 } 258 if (bootverbose) 259 device_printf(sc->sc_bsc.ops_pcib_sc.dev, "device " 260 "%s%d requested decoded memory range 0x%lx-0x%lx\n", 261 device_get_name(child), device_get_unit(child), 262 start, end); 263 break; 264 265 default: 266 break; 267 } 268 269 passup: 270 /* 271 * Bridge is OK decoding this resource, so pass it up. 272 */ 273 return (bus_generic_alloc_resource(dev, child, type, rid, start, end, 274 count, flags)); 275} 276