nexus.c revision 266160
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 266160 2014-05-15 17:30:16Z 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/fdt/fdt_common.h> 67#include <machine/fdt.h> 68#include "ofw_bus_if.h" 69#endif 70 71static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device"); 72 73struct nexus_device { 74 struct resource_list nx_resources; 75}; 76 77#define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev)) 78 79static struct rman mem_rman; 80 81static int nexus_probe(device_t); 82static int nexus_attach(device_t); 83static int nexus_print_child(device_t, device_t); 84static device_t nexus_add_child(device_t, u_int, const char *, int); 85static struct resource *nexus_alloc_resource(device_t, device_t, int, int *, 86 u_long, u_long, u_long, u_int); 87static int nexus_activate_resource(device_t, device_t, int, int, 88 struct resource *); 89static int nexus_config_intr(device_t dev, int irq, enum intr_trigger trig, 90 enum intr_polarity pol); 91static int nexus_deactivate_resource(device_t, device_t, int, int, 92 struct resource *); 93 94static int nexus_setup_intr(device_t dev, device_t child, struct resource *res, 95 int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep); 96static int nexus_teardown_intr(device_t, device_t, struct resource *, void *); 97 98#ifdef FDT 99static int nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, 100 int icells, pcell_t *intr); 101#endif 102 103static device_method_t nexus_methods[] = { 104 /* Device interface */ 105 DEVMETHOD(device_probe, nexus_probe), 106 DEVMETHOD(device_attach, nexus_attach), 107 /* Bus interface */ 108 DEVMETHOD(bus_print_child, nexus_print_child), 109 DEVMETHOD(bus_add_child, nexus_add_child), 110 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 111 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 112 DEVMETHOD(bus_config_intr, nexus_config_intr), 113 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource), 114 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 115 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 116#ifdef FDT 117 DEVMETHOD(ofw_bus_map_intr, nexus_ofw_map_intr), 118#endif 119 { 0, 0 } 120}; 121 122static devclass_t nexus_devclass; 123static driver_t nexus_driver = { 124 "nexus", 125 nexus_methods, 126 1 /* no softc */ 127}; 128DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0); 129 130static int 131nexus_probe(device_t dev) 132{ 133 134 device_quiet(dev); /* suppress attach message for neatness */ 135 136 return (BUS_PROBE_DEFAULT); 137} 138 139static int 140nexus_attach(device_t dev) 141{ 142 143 mem_rman.rm_start = 0; 144 mem_rman.rm_end = ~0ul; 145 mem_rman.rm_type = RMAN_ARRAY; 146 mem_rman.rm_descr = "I/O memory addresses"; 147 if (rman_init(&mem_rman) || rman_manage_region(&mem_rman, 0, ~0)) 148 panic("nexus_probe mem_rman"); 149 150 /* 151 * First, deal with the children we know about already 152 */ 153 bus_generic_probe(dev); 154 bus_generic_attach(dev); 155 156 return (0); 157} 158 159static int 160nexus_print_child(device_t bus, device_t child) 161{ 162 int retval = 0; 163 164 retval += bus_print_child_header(bus, child); 165 retval += printf("\n"); 166 167 return (retval); 168} 169 170static device_t 171nexus_add_child(device_t bus, u_int order, const char *name, int unit) 172{ 173 device_t child; 174 struct nexus_device *ndev; 175 176 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 177 if (!ndev) 178 return (0); 179 resource_list_init(&ndev->nx_resources); 180 181 child = device_add_child_ordered(bus, order, name, unit); 182 183 /* should we free this in nexus_child_detached? */ 184 device_set_ivars(child, ndev); 185 186 return (child); 187} 188 189 190/* 191 * Allocate a resource on behalf of child. NB: child is usually going to be a 192 * child of one of our descendants, not a direct child of nexus0. 193 * (Exceptions include footbridge.) 194 */ 195static struct resource * 196nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 197 u_long start, u_long end, u_long count, u_int flags) 198{ 199 struct resource *rv; 200 struct rman *rm; 201 int needactivate = flags & RF_ACTIVE; 202 203 switch (type) { 204 case SYS_RES_MEMORY: 205 case SYS_RES_IOPORT: 206 rm = &mem_rman; 207 break; 208 209 default: 210 return (0); 211 } 212 213 rv = rman_reserve_resource(rm, start, end, count, flags, child); 214 if (rv == 0) 215 return (0); 216 217 rman_set_rid(rv, *rid); 218 rman_set_bushandle(rv, rman_get_start(rv)); 219 220 if (needactivate) { 221 if (bus_activate_resource(child, type, *rid, rv)) { 222 rman_release_resource(rv); 223 return (0); 224 } 225 } 226 227 return (rv); 228} 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 int err; 272 bus_addr_t paddr; 273 bus_size_t psize; 274 bus_space_handle_t vaddr; 275 276 if ((err = rman_activate_resource(r)) != 0) 277 return (err); 278 279 /* 280 * If this is a memory resource, map it into the kernel. 281 */ 282 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) { 283 paddr = (bus_addr_t)rman_get_start(r); 284 psize = (bus_size_t)rman_get_size(r); 285#ifdef FDT 286 err = bus_space_map(fdtbus_bs_tag, paddr, psize, 0, &vaddr); 287 if (err != 0) { 288 rman_deactivate_resource(r); 289 return (err); 290 } 291 rman_set_bustag(r, fdtbus_bs_tag); 292#else 293 vaddr = (bus_space_handle_t)pmap_mapdev((vm_offset_t)paddr, 294 (vm_size_t)psize); 295 if (vaddr == 0) { 296 rman_deactivate_resource(r); 297 return (ENOMEM); 298 } 299 rman_set_bustag(r, (void *)1); 300#endif 301 rman_set_virtual(r, (void *)vaddr); 302 rman_set_bushandle(r, vaddr); 303 } 304 return (0); 305} 306 307static int 308nexus_deactivate_resource(device_t bus, device_t child, int type, int rid, 309 struct resource *r) 310{ 311 bus_size_t psize; 312 bus_space_handle_t vaddr; 313 314 psize = (bus_size_t)rman_get_size(r); 315 vaddr = rman_get_bushandle(r); 316 317 if (vaddr != 0) { 318#ifdef FDT 319 bus_space_unmap(fdtbus_bs_tag, vaddr, psize); 320#else 321 pmap_unmapdev((vm_offset_t)vaddr, (vm_size_t)psize); 322#endif 323 rman_set_virtual(r, NULL); 324 rman_set_bushandle(r, 0); 325 } 326 327 return (rman_deactivate_resource(r)); 328} 329 330#ifdef FDT 331static int 332nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells, 333 pcell_t *intr) 334{ 335 fdt_pic_decode_t intr_decode; 336 phandle_t intr_offset; 337 int i, rv, interrupt, trig, pol; 338 339 intr_offset = OF_xref_phandle(iparent); 340 for (i = 0; i < icells; i++) 341 intr[i] = cpu_to_fdt32(intr[i]); 342 343 for (i = 0; fdt_pic_table[i] != NULL; i++) { 344 intr_decode = fdt_pic_table[i]; 345 rv = intr_decode(intr_offset, intr, &interrupt, &trig, &pol); 346 347 if (rv == 0) { 348 /* This was recognized as our PIC and decoded. */ 349 interrupt = FDT_MAP_IRQ(intr_parent, interrupt); 350 return (interrupt); 351 } 352 } 353 354 /* Not in table, so guess */ 355 interrupt = FDT_MAP_IRQ(intr_parent, fdt32_to_cpu(intr[0])); 356 357 return (interrupt); 358} 359#endif 360 361