nexus.c revision 266070
1/*- 2 * Copyright 1998 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31/* 32 * This code implements a `root nexus' for Arm Architecture 33 * machines. The function of the root nexus is to serve as an 34 * attachment point for both processors and buses, and to manage 35 * resources which are common to all of them. In particular, 36 * this code implements the core resource managers for interrupt 37 * requests, DMA requests (which rightfully should be a part of the 38 * ISA code but it's easier to do it here for now), I/O port addresses, 39 * and I/O memory address space. 40 */ 41 42#include <sys/cdefs.h> 43__FBSDID("$FreeBSD: stable/10/sys/arm/arm/nexus.c 266070 2014-05-14 18:25:13Z ian $"); 44 45#include <sys/param.h> 46#include <sys/systm.h> 47#include <sys/bus.h> 48#include <sys/kernel.h> 49#include <sys/malloc.h> 50#include <sys/module.h> 51#include <machine/bus.h> 52#include <sys/rman.h> 53#include <sys/interrupt.h> 54 55#include <machine/vmparam.h> 56#include <machine/pcb.h> 57#include <vm/vm.h> 58#include <vm/pmap.h> 59 60#include <machine/resource.h> 61#include <machine/intr.h> 62 63#include "opt_platform.h" 64 65#ifdef FDT 66#include <dev/ofw/ofw_nexus.h> 67#include <machine/fdt.h> 68#else 69static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device"); 70 71struct nexus_device { 72 struct resource_list nx_resources; 73}; 74 75#define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev)) 76 77static struct rman mem_rman; 78 79static int nexus_probe(device_t); 80static int nexus_attach(device_t); 81static int nexus_print_child(device_t, device_t); 82static device_t nexus_add_child(device_t, u_int, const char *, int); 83static struct resource *nexus_alloc_resource(device_t, device_t, int, int *, 84 u_long, u_long, u_long, u_int); 85#endif 86static int nexus_activate_resource(device_t, device_t, int, int, 87 struct resource *); 88static int nexus_config_intr(device_t dev, int irq, enum intr_trigger trig, 89 enum intr_polarity pol); 90static int nexus_deactivate_resource(device_t, device_t, int, int, 91 struct resource *); 92 93static int nexus_setup_intr(device_t dev, device_t child, struct resource *res, 94 int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep); 95static int nexus_teardown_intr(device_t, device_t, struct resource *, void *); 96 97static device_method_t nexus_methods[] = { 98#ifndef FDT 99 /* Device interface */ 100 DEVMETHOD(device_probe, nexus_probe), 101 DEVMETHOD(device_attach, nexus_attach), 102 /* Bus interface */ 103 DEVMETHOD(bus_print_child, nexus_print_child), 104 DEVMETHOD(bus_add_child, nexus_add_child), 105 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 106#endif 107 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 108 DEVMETHOD(bus_config_intr, nexus_config_intr), 109 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource), 110 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 111 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 112 { 0, 0 } 113}; 114 115static devclass_t nexus_devclass; 116#ifndef FDT 117static driver_t nexus_driver = { 118 "nexus", 119 nexus_methods, 120 1 /* no softc */ 121}; 122#else 123DEFINE_CLASS_1(nexus, nexus_driver, nexus_methods, 124 sizeof(struct ofw_nexus_softc), ofw_nexus_driver); 125#endif 126DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0); 127 128#ifndef FDT 129static int 130nexus_probe(device_t dev) 131{ 132 133 device_quiet(dev); /* suppress attach message for neatness */ 134 135 return (BUS_PROBE_DEFAULT); 136} 137 138static int 139nexus_attach(device_t dev) 140{ 141 142 mem_rman.rm_start = 0; 143 mem_rman.rm_end = ~0ul; 144 mem_rman.rm_type = RMAN_ARRAY; 145 mem_rman.rm_descr = "I/O memory addresses"; 146 if (rman_init(&mem_rman) || rman_manage_region(&mem_rman, 0, ~0)) 147 panic("nexus_probe mem_rman"); 148 149 /* 150 * First, deal with the children we know about already 151 */ 152 bus_generic_probe(dev); 153 bus_generic_attach(dev); 154 155 return (0); 156} 157 158static int 159nexus_print_child(device_t bus, device_t child) 160{ 161 int retval = 0; 162 163 retval += bus_print_child_header(bus, child); 164 retval += printf("\n"); 165 166 return (retval); 167} 168 169static device_t 170nexus_add_child(device_t bus, u_int order, const char *name, int unit) 171{ 172 device_t child; 173 struct nexus_device *ndev; 174 175 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 176 if (!ndev) 177 return (0); 178 resource_list_init(&ndev->nx_resources); 179 180 child = device_add_child_ordered(bus, order, name, unit); 181 182 /* should we free this in nexus_child_detached? */ 183 device_set_ivars(child, ndev); 184 185 return (child); 186} 187 188 189/* 190 * Allocate a resource on behalf of child. NB: child is usually going to be a 191 * child of one of our descendants, not a direct child of nexus0. 192 * (Exceptions include footbridge.) 193 */ 194static struct resource * 195nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 196 u_long start, u_long end, u_long count, u_int flags) 197{ 198 struct resource *rv; 199 struct rman *rm; 200 int needactivate = flags & RF_ACTIVE; 201 202 switch (type) { 203 case SYS_RES_MEMORY: 204 case SYS_RES_IOPORT: 205 rm = &mem_rman; 206 break; 207 208 default: 209 return (0); 210 } 211 212 rv = rman_reserve_resource(rm, start, end, count, flags, child); 213 if (rv == 0) 214 return (0); 215 216 rman_set_rid(rv, *rid); 217 rman_set_bushandle(rv, rman_get_start(rv)); 218 219 if (needactivate) { 220 if (bus_activate_resource(child, type, *rid, rv)) { 221 rman_release_resource(rv); 222 return (0); 223 } 224 } 225 226 return (rv); 227} 228#endif 229 230static int 231nexus_config_intr(device_t dev, int irq, enum intr_trigger trig, 232 enum intr_polarity pol) 233{ 234 int ret = ENODEV; 235 236 if (arm_config_irq) 237 ret = (*arm_config_irq)(irq, trig, pol); 238 239 return (ret); 240} 241 242static int 243nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 244 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep) 245{ 246 int irq; 247 248 if ((rman_get_flags(res) & RF_SHAREABLE) == 0) 249 flags |= INTR_EXCL; 250 251 for (irq = rman_get_start(res); irq <= rman_get_end(res); irq++) { 252 arm_setup_irqhandler(device_get_nameunit(child), 253 filt, intr, arg, irq, flags, cookiep); 254 arm_unmask_irq(irq); 255 } 256 return (0); 257} 258 259static int 260nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih) 261{ 262 263 return (arm_remove_irqhandler(rman_get_start(r), ih)); 264} 265 266 267static int 268nexus_activate_resource(device_t bus, device_t child, int type, int rid, 269 struct resource *r) 270{ 271 /* 272 * If this is a memory resource, map it into the kernel. 273 */ 274 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) { 275 caddr_t vaddr = 0; 276 u_int32_t paddr; 277 u_int32_t psize; 278 u_int32_t poffs; 279 280 paddr = rman_get_start(r); 281 psize = rman_get_size(r); 282 poffs = paddr - trunc_page(paddr); 283 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs; 284 rman_set_virtual(r, vaddr); 285#ifdef FDT 286 rman_set_bustag(r, fdtbus_bs_tag); 287#else 288 rman_set_bustag(r, (void *)1); 289#endif 290 rman_set_bushandle(r, (bus_space_handle_t) vaddr); 291 } 292 return (rman_activate_resource(r)); 293} 294 295static int 296nexus_deactivate_resource(device_t bus, device_t child, int type, int rid, 297 struct resource *res) 298{ 299 300 return (rman_deactivate_resource(res)); 301} 302 303