nexus.c revision 129580
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 129580 2004-05-22 13:15:14Z mux $"); 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#include <machine/pmap.h> 60 61#include <machine/resource.h> 62#include <machine/intr.h> 63 64static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device"); 65 66struct nexus_device { 67 struct resource_list nx_resources; 68}; 69 70#define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev)) 71 72static struct rman mem_rman; 73 74static int nexus_probe(device_t); 75static int nexus_attach(device_t); 76static int nexus_print_child(device_t, device_t); 77static device_t nexus_add_child(device_t, int, const char *, int); 78static struct resource *nexus_alloc_resource(device_t, device_t, int, int *, 79 u_long, u_long, u_long, u_int); 80static int nexus_activate_resource(device_t, device_t, int, int, 81 struct resource *); 82static int 83nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 84 driver_intr_t *intr, void *arg, void **cookiep); 85static device_method_t nexus_methods[] = { 86 /* Device interface */ 87 DEVMETHOD(device_probe, nexus_probe), 88 DEVMETHOD(device_attach, nexus_attach), 89 /* Bus interface */ 90 DEVMETHOD(bus_print_child, nexus_print_child), 91 DEVMETHOD(bus_add_child, nexus_add_child), 92 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 93 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 94 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 95 { 0, 0 } 96}; 97 98static driver_t nexus_driver = { 99 "nexus", 100 nexus_methods, 101 1 /* no softc */ 102}; 103static devclass_t nexus_devclass; 104 105static int 106nexus_probe(device_t dev) 107{ 108 device_quiet(dev); /* suppress attach message for neatness */ 109 110 mem_rman.rm_start = 0; 111 mem_rman.rm_end = ~0u; 112 mem_rman.rm_type = RMAN_ARRAY; 113 mem_rman.rm_descr = "I/O memory addresses"; 114 if (rman_init(&mem_rman) 115 || rman_manage_region(&mem_rman, 0, ~0u)) 116 panic("nexus_probe mem_rman"); 117 118 return (0); 119 return bus_generic_probe(dev); 120} 121 122static int 123nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 124 driver_intr_t *intr, void *arg, void **cookiep) 125{ 126 arm_setup_irqhandler(device_get_nameunit(child), 127 intr, arg, res->r_start, flags, cookiep); 128 return (0); 129} 130 131 132static int 133nexus_attach(device_t dev) 134{ 135 /* 136 * First, deal with the children we know about already 137 */ 138 bus_generic_probe(dev); 139 bus_generic_attach(dev); 140 141 return 0; 142} 143 144 145static int 146nexus_print_child(device_t bus, device_t child) 147{ 148 int retval = 0; 149 150 retval += bus_print_child_header(bus, child); 151 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */ 152 153 return (retval); 154} 155 156 157static device_t 158nexus_add_child(device_t bus, int order, const char *name, int unit) 159{ 160 device_t child; 161 struct nexus_device *ndev; 162 163 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 164 if (!ndev) 165 return(0); 166 resource_list_init(&ndev->nx_resources); 167 168 child = device_add_child_ordered(bus, order, name, unit); 169 170 /* should we free this in nexus_child_detached? */ 171 device_set_ivars(child, ndev); 172 173 return(child); 174} 175 176 177/* 178 * Allocate a resource on behalf of child. NB: child is usually going to be a 179 * child of one of our descendants, not a direct child of nexus0. 180 * (Exceptions include footbridge.) 181 */ 182#define ARM_BUS_SPACE_MEM 1 183static struct resource * 184nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 185 u_long start, u_long end, u_long count, u_int flags) 186{ 187 struct resource *rv; 188 struct rman *rm; 189 int needactivate = flags & RF_ACTIVE; 190 191 switch (type) { 192 case SYS_RES_MEMORY: 193 rm = &mem_rman; 194 break; 195 196 default: 197 return 0; 198 } 199 200 rv = rman_reserve_resource(rm, start, end, count, flags, child); 201 if (rv == 0) 202 return 0; 203 204 rman_set_bustag(rv, (void*)ARM_BUS_SPACE_MEM); 205 rman_set_bushandle(rv, rv->r_start); 206 207 if (needactivate) { 208 if (bus_activate_resource(child, type, *rid, rv)) { 209 rman_release_resource(rv); 210 return 0; 211 } 212 } 213 214 return rv; 215} 216 217 218static int 219nexus_activate_resource(device_t bus, device_t child, int type, int rid, 220 struct resource *r) 221{ 222 /* 223 * If this is a memory resource, map it into the kernel. 224 */ 225 if (rman_get_bustag(r) == (void*)ARM_BUS_SPACE_MEM) { 226 caddr_t vaddr = 0; 227 u_int32_t paddr; 228 u_int32_t psize; 229 u_int32_t poffs; 230 231 paddr = rman_get_start(r); 232 psize = rman_get_size(r); 233 poffs = paddr - trunc_page(paddr); 234 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs; 235 rman_set_virtual(r, vaddr); 236 rman_set_bushandle(r, (bus_space_handle_t) vaddr); 237 } 238 return (rman_activate_resource(r)); 239} 240 241DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0); 242