nexus.c revision 129198
1129198Scognet/* 2129198Scognet * Copyright 1998 Massachusetts Institute of Technology 3129198Scognet * 4129198Scognet * Permission to use, copy, modify, and distribute this software and 5129198Scognet * its documentation for any purpose and without fee is hereby 6129198Scognet * granted, provided that both the above copyright notice and this 7129198Scognet * permission notice appear in all copies, that both the above 8129198Scognet * copyright notice and this permission notice appear in all 9129198Scognet * supporting documentation, and that the name of M.I.T. not be used 10129198Scognet * in advertising or publicity pertaining to distribution of the 11129198Scognet * software without specific, written prior permission. M.I.T. makes 12129198Scognet * no representations about the suitability of this software for any 13129198Scognet * purpose. It is provided "as is" without express or implied 14129198Scognet * warranty. 15129198Scognet * 16129198Scognet * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17129198Scognet * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18129198Scognet * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19129198Scognet * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20129198Scognet * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21129198Scognet * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22129198Scognet * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23129198Scognet * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24129198Scognet * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25129198Scognet * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26129198Scognet * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27129198Scognet * SUCH DAMAGE. 28129198Scognet * 29129198Scognet */ 30129198Scognet 31129198Scognet/* 32129198Scognet * This code implements a `root nexus' for Arm Architecture 33129198Scognet * machines. The function of the root nexus is to serve as an 34129198Scognet * attachment point for both processors and buses, and to manage 35129198Scognet * resources which are common to all of them. In particular, 36129198Scognet * this code implements the core resource managers for interrupt 37129198Scognet * requests, DMA requests (which rightfully should be a part of the 38129198Scognet * ISA code but it's easier to do it here for now), I/O port addresses, 39129198Scognet * and I/O memory address space. 40129198Scognet */ 41129198Scognet 42129198Scognet#include <sys/cdefs.h> 43129198Scognet__FBSDID("$FreeBSD: head/sys/arm/arm/nexus.c 129198 2004-05-14 11:46:45Z cognet $"); 44129198Scognet 45129198Scognet#include <sys/param.h> 46129198Scognet#include <sys/systm.h> 47129198Scognet#include <sys/bus.h> 48129198Scognet#include <sys/kernel.h> 49129198Scognet#include <sys/malloc.h> 50129198Scognet#include <sys/module.h> 51129198Scognet#include <machine/bus.h> 52129198Scognet#include <sys/rman.h> 53129198Scognet#include <sys/interrupt.h> 54129198Scognet 55129198Scognet#include <machine/vmparam.h> 56129198Scognet#include <machine/pcb.h> 57129198Scognet#include <vm/vm.h> 58129198Scognet#include <vm/pmap.h> 59129198Scognet#include <machine/pmap.h> 60129198Scognet 61129198Scognet#include <machine/resource.h> 62129198Scognet#include <machine/intr.h> 63129198Scognet 64129198Scognetstatic MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device"); 65129198Scognet 66129198Scognetstruct nexus_device { 67129198Scognet struct resource_list nx_resources; 68129198Scognet}; 69129198Scognet 70129198Scognet#define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev)) 71129198Scognet 72129198Scognetstatic struct rman mem_rman; 73129198Scognet 74129198Scognetstatic int nexus_probe(device_t); 75129198Scognetstatic int nexus_attach(device_t); 76129198Scognetstatic int nexus_print_child(device_t, device_t); 77129198Scognetstatic device_t nexus_add_child(device_t, int, const char *, int); 78129198Scognetstatic struct resource *nexus_alloc_resource(device_t, device_t, int, int *, 79129198Scognet u_long, u_long, u_long, u_int); 80129198Scognetstatic int nexus_activate_resource(device_t, device_t, int, int, 81129198Scognet struct resource *); 82129198Scognetstatic int 83129198Scognetnexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 84129198Scognet driver_intr_t *intr, void *arg, void **cookiep); 85129198Scognetstatic device_method_t nexus_methods[] = { 86129198Scognet /* Device interface */ 87129198Scognet DEVMETHOD(device_probe, nexus_probe), 88129198Scognet DEVMETHOD(device_attach, nexus_attach), 89129198Scognet /* Bus interface */ 90129198Scognet DEVMETHOD(bus_print_child, nexus_print_child), 91129198Scognet DEVMETHOD(bus_add_child, nexus_add_child), 92129198Scognet DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 93129198Scognet DEVMETHOD(bus_activate_resource, nexus_activate_resource), 94129198Scognet DEVMETHOD(bus_setup_intr, nexus_setup_intr), 95129198Scognet { 0, 0 } 96129198Scognet}; 97129198Scognet 98129198Scognetstatic driver_t nexus_driver = { 99129198Scognet "nexus", 100129198Scognet nexus_methods, 101129198Scognet 1 /* no softc */ 102129198Scognet}; 103129198Scognetstatic devclass_t nexus_devclass; 104129198Scognet 105129198Scognetstatic int 106129198Scognetnexus_probe(device_t dev) 107129198Scognet{ 108129198Scognet device_quiet(dev); /* suppress attach message for neatness */ 109129198Scognet 110129198Scognet mem_rman.rm_start = 0; 111129198Scognet mem_rman.rm_end = ~0u; 112129198Scognet mem_rman.rm_type = RMAN_ARRAY; 113129198Scognet mem_rman.rm_descr = "I/O memory addresses"; 114129198Scognet if (rman_init(&mem_rman) 115129198Scognet || rman_manage_region(&mem_rman, 0, ~0u)) 116129198Scognet panic("nexus_probe mem_rman"); 117129198Scognet 118129198Scognet return (0); 119129198Scognet return bus_generic_probe(dev); 120129198Scognet} 121129198Scognet 122129198Scognetstatic int 123129198Scognetnexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 124129198Scognet driver_intr_t *intr, void *arg, void **cookiep) 125129198Scognet{ 126129198Scognet arm_setup_irqhandler(device_get_nameunit(child), 127129198Scognet intr, arg, res->r_start, flags, cookiep); 128129198Scognet return (0); 129129198Scognet} 130129198Scognet 131129198Scognet 132129198Scognetstatic int 133129198Scognetnexus_attach(device_t dev) 134129198Scognet{ 135129198Scognet /* 136129198Scognet * First, deal with the children we know about already 137129198Scognet */ 138129198Scognet printf("avant\n"); 139129198Scognet bus_generic_probe(dev); 140129198Scognet bus_generic_attach(dev); 141129198Scognet printf("nexus_attach\n"); 142129198Scognet 143129198Scognet return 0; 144129198Scognet} 145129198Scognet 146129198Scognet 147129198Scognetstatic int 148129198Scognetnexus_print_child(device_t bus, device_t child) 149129198Scognet{ 150129198Scognet int retval = 0; 151129198Scognet 152129198Scognet retval += bus_print_child_header(bus, child); 153129198Scognet retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */ 154129198Scognet 155129198Scognet return (retval); 156129198Scognet} 157129198Scognet 158129198Scognet 159129198Scognetstatic device_t 160129198Scognetnexus_add_child(device_t bus, int order, const char *name, int unit) 161129198Scognet{ 162129198Scognet device_t child; 163129198Scognet struct nexus_device *ndev; 164129198Scognet 165129198Scognet ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 166129198Scognet if (!ndev) 167129198Scognet return(0); 168129198Scognet resource_list_init(&ndev->nx_resources); 169129198Scognet 170129198Scognet child = device_add_child_ordered(bus, order, name, unit); 171129198Scognet 172129198Scognet /* should we free this in nexus_child_detached? */ 173129198Scognet device_set_ivars(child, ndev); 174129198Scognet 175129198Scognet return(child); 176129198Scognet} 177129198Scognet 178129198Scognet 179129198Scognet/* 180129198Scognet * Allocate a resource on behalf of child. NB: child is usually going to be a 181129198Scognet * child of one of our descendants, not a direct child of nexus0. 182129198Scognet * (Exceptions include footbridge.) 183129198Scognet */ 184129198Scognet#define ARM_BUS_SPACE_MEM 1 185129198Scognetstatic struct resource * 186129198Scognetnexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 187129198Scognet u_long start, u_long end, u_long count, u_int flags) 188129198Scognet{ 189129198Scognet struct resource *rv; 190129198Scognet struct rman *rm; 191129198Scognet int needactivate = flags & RF_ACTIVE; 192129198Scognet 193129198Scognet switch (type) { 194129198Scognet case SYS_RES_MEMORY: 195129198Scognet rm = &mem_rman; 196129198Scognet break; 197129198Scognet 198129198Scognet default: 199129198Scognet return 0; 200129198Scognet } 201129198Scognet 202129198Scognet rv = rman_reserve_resource(rm, start, end, count, flags, child); 203129198Scognet if (rv == 0) 204129198Scognet return 0; 205129198Scognet 206129198Scognet rman_set_bustag(rv, (void*)ARM_BUS_SPACE_MEM); 207129198Scognet rman_set_bushandle(rv, rv->r_start); 208129198Scognet 209129198Scognet if (needactivate) { 210129198Scognet if (bus_activate_resource(child, type, *rid, rv)) { 211129198Scognet rman_release_resource(rv); 212129198Scognet return 0; 213129198Scognet } 214129198Scognet } 215129198Scognet 216129198Scognet return rv; 217129198Scognet} 218129198Scognet 219129198Scognet 220129198Scognetstatic int 221129198Scognetnexus_activate_resource(device_t bus, device_t child, int type, int rid, 222129198Scognet struct resource *r) 223129198Scognet{ 224129198Scognet /* 225129198Scognet * If this is a memory resource, map it into the kernel. 226129198Scognet */ 227129198Scognet if (rman_get_bustag(r) == (void*)ARM_BUS_SPACE_MEM) { 228129198Scognet caddr_t vaddr = 0; 229129198Scognet u_int32_t paddr; 230129198Scognet u_int32_t psize; 231129198Scognet u_int32_t poffs; 232129198Scognet 233129198Scognet paddr = rman_get_start(r); 234129198Scognet psize = rman_get_size(r); 235129198Scognet poffs = paddr - trunc_page(paddr); 236129198Scognet vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs; 237129198Scognet rman_set_virtual(r, vaddr); 238129198Scognet rman_set_bushandle(r, (bus_space_handle_t) vaddr); 239129198Scognet } 240129198Scognet return (rman_activate_resource(r)); 241129198Scognet} 242129198Scognet 243129198ScognetDRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0); 244