nexus.c revision 235907
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 235907 2012-05-24 12:38:24Z gber $"); 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, u_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 nexus_setup_intr(device_t dev, device_t child, struct resource *res, 83 int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep); 84static int nexus_teardown_intr(device_t, device_t, struct resource *, void *); 85 86static device_method_t nexus_methods[] = { 87 /* Device interface */ 88 DEVMETHOD(device_probe, nexus_probe), 89 DEVMETHOD(device_attach, nexus_attach), 90 /* Bus interface */ 91 DEVMETHOD(bus_print_child, nexus_print_child), 92 DEVMETHOD(bus_add_child, nexus_add_child), 93 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 94 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 95 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 96 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 97 { 0, 0 } 98}; 99 100static driver_t nexus_driver = { 101 "nexus", 102 nexus_methods, 103 1 /* no softc */ 104}; 105static devclass_t nexus_devclass; 106 107static int 108nexus_probe(device_t dev) 109{ 110 111 device_quiet(dev); /* suppress attach message for neatness */ 112 113 return (BUS_PROBE_DEFAULT); 114} 115 116static int 117nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 118 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep) 119{ 120 121 if ((rman_get_flags(res) & RF_SHAREABLE) == 0) 122 flags |= INTR_EXCL; 123 124 arm_setup_irqhandler(device_get_nameunit(child), 125 filt, intr, arg, rman_get_start(res), flags, cookiep); 126 return (0); 127} 128 129static int 130nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih) 131{ 132 133 return (arm_remove_irqhandler(rman_get_start(r), ih)); 134} 135 136static int 137nexus_attach(device_t dev) 138{ 139 140 mem_rman.rm_start = 0; 141 mem_rman.rm_end = ~0ul; 142 mem_rman.rm_type = RMAN_ARRAY; 143 mem_rman.rm_descr = "I/O memory addresses"; 144 if (rman_init(&mem_rman) || rman_manage_region(&mem_rman, 0, ~0)) 145 panic("nexus_probe mem_rman"); 146 147 /* 148 * First, deal with the children we know about already 149 */ 150 bus_generic_probe(dev); 151 bus_generic_attach(dev); 152 153 return (0); 154} 155 156 157static int 158nexus_print_child(device_t bus, device_t child) 159{ 160 int retval = 0; 161 162 retval += bus_print_child_header(bus, child); 163 retval += printf("\n"); 164 165 return (retval); 166} 167 168static device_t 169nexus_add_child(device_t bus, u_int order, const char *name, int unit) 170{ 171 device_t child; 172 struct nexus_device *ndev; 173 174 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 175 if (!ndev) 176 return (0); 177 resource_list_init(&ndev->nx_resources); 178 179 child = device_add_child_ordered(bus, order, name, unit); 180 181 /* should we free this in nexus_child_detached? */ 182 device_set_ivars(child, ndev); 183 184 return (child); 185} 186 187 188/* 189 * Allocate a resource on behalf of child. NB: child is usually going to be a 190 * child of one of our descendants, not a direct child of nexus0. 191 * (Exceptions include footbridge.) 192 */ 193#define ARM_BUS_SPACE_MEM 1 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 rm = &mem_rman; 205 break; 206 207 default: 208 return (0); 209 } 210 211 rv = rman_reserve_resource(rm, start, end, count, flags, child); 212 if (rv == 0) 213 return (0); 214 215 rman_set_rid(rv, *rid); 216 rman_set_bustag(rv, (void*)ARM_BUS_SPACE_MEM); 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} 228 229 230static int 231nexus_activate_resource(device_t bus, device_t child, int type, int rid, 232 struct resource *r) 233{ 234 /* 235 * If this is a memory resource, map it into the kernel. 236 */ 237 if (rman_get_bustag(r) == (void*)ARM_BUS_SPACE_MEM) { 238 caddr_t vaddr = 0; 239 u_int32_t paddr; 240 u_int32_t psize; 241 u_int32_t poffs; 242 243 paddr = rman_get_start(r); 244 psize = rman_get_size(r); 245 poffs = paddr - trunc_page(paddr); 246 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs; 247 rman_set_virtual(r, vaddr); 248 rman_set_bushandle(r, (bus_space_handle_t) vaddr); 249 } 250 return (rman_activate_resource(r)); 251} 252 253DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0); 254