nexus.c revision 257702
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: head/sys/arm/arm/nexus.c 257702 2013-11-05 13:48:34Z nwhitehorn $"); 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_deactivate_resource(device_t, device_t, int, int, 89 struct resource *); 90 91static int nexus_setup_intr(device_t dev, device_t child, struct resource *res, 92 int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep); 93static int nexus_teardown_intr(device_t, device_t, struct resource *, void *); 94 95static device_method_t nexus_methods[] = { 96#ifndef FDT 97 /* Device interface */ 98 DEVMETHOD(device_probe, nexus_probe), 99 DEVMETHOD(device_attach, nexus_attach), 100 /* Bus interface */ 101 DEVMETHOD(bus_print_child, nexus_print_child), 102 DEVMETHOD(bus_add_child, nexus_add_child), 103 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 104#endif 105 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 106 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource), 107 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 108 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 109 { 0, 0 } 110}; 111 112static devclass_t nexus_devclass; 113#ifndef FDT 114static driver_t nexus_driver = { 115 "nexus", 116 nexus_methods, 117 1 /* no softc */ 118}; 119#else 120DEFINE_CLASS_1(nexus, nexus_driver, nexus_methods, 121 sizeof(struct ofw_nexus_softc), ofw_nexus_driver); 122#endif 123DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0); 124 125#ifndef FDT 126static int 127nexus_probe(device_t dev) 128{ 129 130 device_quiet(dev); /* suppress attach message for neatness */ 131 132 return (BUS_PROBE_DEFAULT); 133} 134 135static int 136nexus_attach(device_t dev) 137{ 138 139 mem_rman.rm_start = 0; 140 mem_rman.rm_end = ~0ul; 141 mem_rman.rm_type = RMAN_ARRAY; 142 mem_rman.rm_descr = "I/O memory addresses"; 143 if (rman_init(&mem_rman) || rman_manage_region(&mem_rman, 0, ~0)) 144 panic("nexus_probe mem_rman"); 145 146 /* 147 * First, deal with the children we know about already 148 */ 149 bus_generic_probe(dev); 150 bus_generic_attach(dev); 151 152 return (0); 153} 154 155static int 156nexus_print_child(device_t bus, device_t child) 157{ 158 int retval = 0; 159 160 retval += bus_print_child_header(bus, child); 161 retval += printf("\n"); 162 163 return (retval); 164} 165 166static device_t 167nexus_add_child(device_t bus, u_int order, const char *name, int unit) 168{ 169 device_t child; 170 struct nexus_device *ndev; 171 172 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 173 if (!ndev) 174 return (0); 175 resource_list_init(&ndev->nx_resources); 176 177 child = device_add_child_ordered(bus, order, name, unit); 178 179 /* should we free this in nexus_child_detached? */ 180 device_set_ivars(child, ndev); 181 182 return (child); 183} 184 185 186/* 187 * Allocate a resource on behalf of child. NB: child is usually going to be a 188 * child of one of our descendants, not a direct child of nexus0. 189 * (Exceptions include footbridge.) 190 */ 191static struct resource * 192nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 193 u_long start, u_long end, u_long count, u_int flags) 194{ 195 struct resource *rv; 196 struct rman *rm; 197 int needactivate = flags & RF_ACTIVE; 198 199 switch (type) { 200 case SYS_RES_MEMORY: 201 case SYS_RES_IOPORT: 202 rm = &mem_rman; 203 break; 204 205 default: 206 return (0); 207 } 208 209 rv = rman_reserve_resource(rm, start, end, count, flags, child); 210 if (rv == 0) 211 return (0); 212 213 rman_set_rid(rv, *rid); 214 rman_set_bushandle(rv, rman_get_start(rv)); 215 216 if (needactivate) { 217 if (bus_activate_resource(child, type, *rid, rv)) { 218 rman_release_resource(rv); 219 return (0); 220 } 221 } 222 223 return (rv); 224} 225#endif 226 227static int 228nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 229 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep) 230{ 231 int irq; 232 233 if ((rman_get_flags(res) & RF_SHAREABLE) == 0) 234 flags |= INTR_EXCL; 235 236 for (irq = rman_get_start(res); irq <= rman_get_end(res); irq++) { 237 arm_setup_irqhandler(device_get_nameunit(child), 238 filt, intr, arg, irq, flags, cookiep); 239 arm_unmask_irq(irq); 240 } 241 return (0); 242} 243 244static int 245nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih) 246{ 247 248 return (arm_remove_irqhandler(rman_get_start(r), ih)); 249} 250 251 252static int 253nexus_activate_resource(device_t bus, device_t child, int type, int rid, 254 struct resource *r) 255{ 256 /* 257 * If this is a memory resource, map it into the kernel. 258 */ 259 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) { 260 caddr_t vaddr = 0; 261 u_int32_t paddr; 262 u_int32_t psize; 263 u_int32_t poffs; 264 265 paddr = rman_get_start(r); 266 psize = rman_get_size(r); 267 poffs = paddr - trunc_page(paddr); 268 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs; 269 rman_set_virtual(r, vaddr); 270#ifdef FDT 271 rman_set_bustag(r, fdtbus_bs_tag); 272#else 273 rman_set_bustag(r, (void *)1); 274#endif 275 rman_set_bushandle(r, (bus_space_handle_t) vaddr); 276 } 277 return (rman_activate_resource(r)); 278} 279 280static int 281nexus_deactivate_resource(device_t bus, device_t child, int type, int rid, 282 struct resource *res) 283{ 284 285 return (rman_deactivate_resource(res)); 286} 287 288