nexus.c revision 182933
1139735Simp/*- 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 182933 2008-09-11 12:36:13Z raj $"); 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, 84166901Spiso driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep); 85147166Scognetstatic int 86147166Scognetnexus_teardown_intr(device_t, device_t, struct resource *, void *); 87147166Scognet 88129198Scognetstatic device_method_t nexus_methods[] = { 89129198Scognet /* Device interface */ 90129198Scognet DEVMETHOD(device_probe, nexus_probe), 91129198Scognet DEVMETHOD(device_attach, nexus_attach), 92129198Scognet /* Bus interface */ 93129198Scognet DEVMETHOD(bus_print_child, nexus_print_child), 94129198Scognet DEVMETHOD(bus_add_child, nexus_add_child), 95129198Scognet DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 96129198Scognet DEVMETHOD(bus_activate_resource, nexus_activate_resource), 97129198Scognet DEVMETHOD(bus_setup_intr, nexus_setup_intr), 98147166Scognet DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 99129198Scognet { 0, 0 } 100129198Scognet}; 101129198Scognet 102129198Scognetstatic driver_t nexus_driver = { 103129198Scognet "nexus", 104129198Scognet nexus_methods, 105129198Scognet 1 /* no softc */ 106129198Scognet}; 107129198Scognetstatic devclass_t nexus_devclass; 108129198Scognet 109129198Scognetstatic int 110129198Scognetnexus_probe(device_t dev) 111129198Scognet{ 112129198Scognet device_quiet(dev); /* suppress attach message for neatness */ 113129198Scognet 114129198Scognet mem_rman.rm_start = 0; 115129198Scognet mem_rman.rm_end = ~0u; 116129198Scognet mem_rman.rm_type = RMAN_ARRAY; 117129198Scognet mem_rman.rm_descr = "I/O memory addresses"; 118129198Scognet if (rman_init(&mem_rman) 119129198Scognet || rman_manage_region(&mem_rman, 0, ~0u)) 120129198Scognet panic("nexus_probe mem_rman"); 121129198Scognet 122129198Scognet return (0); 123129198Scognet} 124129198Scognet 125129198Scognetstatic int 126129198Scognetnexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 127166901Spiso driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep) 128129198Scognet{ 129163693Scognet 130177105Sraj if ((rman_get_flags(res) & RF_SHAREABLE) == 0) 131177105Sraj flags |= INTR_EXCL; 132177105Sraj 133182933Sraj arm_setup_irqhandler(device_get_nameunit(child), 134182933Sraj filt, intr, arg, rman_get_start(res), flags, cookiep); 135129198Scognet return (0); 136129198Scognet} 137129198Scognet 138147166Scognetstatic int 139147166Scognetnexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih) 140147166Scognet{ 141129198Scognet 142182933Sraj return (arm_remove_irqhandler(rman_get_start(r), ih)); 143147166Scognet} 144147166Scognet 145129198Scognetstatic int 146129198Scognetnexus_attach(device_t dev) 147129198Scognet{ 148129198Scognet /* 149129198Scognet * First, deal with the children we know about already 150129198Scognet */ 151129198Scognet bus_generic_probe(dev); 152129198Scognet bus_generic_attach(dev); 153129198Scognet 154129198Scognet return 0; 155129198Scognet} 156129198Scognet 157129198Scognet 158129198Scognetstatic int 159129198Scognetnexus_print_child(device_t bus, device_t child) 160129198Scognet{ 161129198Scognet int retval = 0; 162129198Scognet 163129198Scognet retval += bus_print_child_header(bus, child); 164129198Scognet retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */ 165129198Scognet 166129198Scognet return (retval); 167129198Scognet} 168129198Scognet 169129198Scognet 170129198Scognetstatic device_t 171129198Scognetnexus_add_child(device_t bus, int order, const char *name, int unit) 172129198Scognet{ 173129198Scognet device_t child; 174129198Scognet struct nexus_device *ndev; 175129198Scognet 176129198Scognet ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 177129198Scognet if (!ndev) 178129198Scognet return(0); 179129198Scognet resource_list_init(&ndev->nx_resources); 180129198Scognet 181129198Scognet child = device_add_child_ordered(bus, order, name, unit); 182129198Scognet 183129198Scognet /* should we free this in nexus_child_detached? */ 184129198Scognet device_set_ivars(child, ndev); 185129198Scognet 186129198Scognet return(child); 187129198Scognet} 188129198Scognet 189129198Scognet 190129198Scognet/* 191129198Scognet * Allocate a resource on behalf of child. NB: child is usually going to be a 192129198Scognet * child of one of our descendants, not a direct child of nexus0. 193129198Scognet * (Exceptions include footbridge.) 194129198Scognet */ 195129198Scognet#define ARM_BUS_SPACE_MEM 1 196129198Scognetstatic struct resource * 197129198Scognetnexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 198129198Scognet u_long start, u_long end, u_long count, u_int flags) 199129198Scognet{ 200129198Scognet struct resource *rv; 201129198Scognet struct rman *rm; 202129198Scognet int needactivate = flags & RF_ACTIVE; 203129198Scognet 204129198Scognet switch (type) { 205129198Scognet case SYS_RES_MEMORY: 206129198Scognet rm = &mem_rman; 207129198Scognet break; 208129198Scognet 209129198Scognet default: 210129198Scognet return 0; 211129198Scognet } 212129198Scognet 213129198Scognet rv = rman_reserve_resource(rm, start, end, count, flags, child); 214129198Scognet if (rv == 0) 215129198Scognet return 0; 216129198Scognet 217157891Simp rman_set_rid(rv, *rid); 218129198Scognet rman_set_bustag(rv, (void*)ARM_BUS_SPACE_MEM); 219150552Scognet rman_set_bushandle(rv, rman_get_start(rv)); 220129198Scognet 221129198Scognet if (needactivate) { 222129198Scognet if (bus_activate_resource(child, type, *rid, rv)) { 223129198Scognet rman_release_resource(rv); 224129198Scognet return 0; 225129198Scognet } 226129198Scognet } 227129198Scognet 228129198Scognet return rv; 229129198Scognet} 230129198Scognet 231129198Scognet 232129198Scognetstatic int 233129198Scognetnexus_activate_resource(device_t bus, device_t child, int type, int rid, 234129198Scognet struct resource *r) 235129198Scognet{ 236129198Scognet /* 237129198Scognet * If this is a memory resource, map it into the kernel. 238129198Scognet */ 239129198Scognet if (rman_get_bustag(r) == (void*)ARM_BUS_SPACE_MEM) { 240129198Scognet caddr_t vaddr = 0; 241129198Scognet u_int32_t paddr; 242129198Scognet u_int32_t psize; 243129198Scognet u_int32_t poffs; 244129198Scognet 245129198Scognet paddr = rman_get_start(r); 246129198Scognet psize = rman_get_size(r); 247129198Scognet poffs = paddr - trunc_page(paddr); 248129198Scognet vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs; 249129198Scognet rman_set_virtual(r, vaddr); 250129198Scognet rman_set_bushandle(r, (bus_space_handle_t) vaddr); 251129198Scognet } 252129198Scognet return (rman_activate_resource(r)); 253129198Scognet} 254129198Scognet 255129198ScognetDRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0); 256