nexus.c revision 212413
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. 15182934Sraj * 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 212413 2010-09-10 11:19:03Z avg $"); 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); 77212413Savgstatic device_t nexus_add_child(device_t, u_int, const char *, int); 78129198Scognetstatic struct resource *nexus_alloc_resource(device_t, device_t, int, int *, 79182934Sraj u_long, u_long, u_long, u_int); 80129198Scognetstatic int nexus_activate_resource(device_t, device_t, int, int, 81182934Sraj struct resource *); 82182934Srajstatic int nexus_setup_intr(device_t dev, device_t child, struct resource *res, 83182934Sraj int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep); 84182934Srajstatic int nexus_teardown_intr(device_t, device_t, struct resource *, void *); 85147166Scognet 86129198Scognetstatic device_method_t nexus_methods[] = { 87129198Scognet /* Device interface */ 88129198Scognet DEVMETHOD(device_probe, nexus_probe), 89129198Scognet DEVMETHOD(device_attach, nexus_attach), 90129198Scognet /* Bus interface */ 91129198Scognet DEVMETHOD(bus_print_child, nexus_print_child), 92129198Scognet DEVMETHOD(bus_add_child, nexus_add_child), 93129198Scognet DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 94129198Scognet DEVMETHOD(bus_activate_resource, nexus_activate_resource), 95129198Scognet DEVMETHOD(bus_setup_intr, nexus_setup_intr), 96147166Scognet DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 97129198Scognet { 0, 0 } 98129198Scognet}; 99129198Scognet 100129198Scognetstatic driver_t nexus_driver = { 101129198Scognet "nexus", 102129198Scognet nexus_methods, 103129198Scognet 1 /* no softc */ 104129198Scognet}; 105129198Scognetstatic devclass_t nexus_devclass; 106129198Scognet 107129198Scognetstatic int 108129198Scognetnexus_probe(device_t dev) 109129198Scognet{ 110209129Sraj 111129198Scognet device_quiet(dev); /* suppress attach message for neatness */ 112182934Sraj 113209129Sraj return (BUS_PROBE_DEFAULT); 114129198Scognet} 115129198Scognet 116129198Scognetstatic int 117129198Scognetnexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 118166901Spiso driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep) 119129198Scognet{ 120163693Scognet 121177105Sraj if ((rman_get_flags(res) & RF_SHAREABLE) == 0) 122177105Sraj flags |= INTR_EXCL; 123177105Sraj 124182933Sraj arm_setup_irqhandler(device_get_nameunit(child), 125182933Sraj filt, intr, arg, rman_get_start(res), flags, cookiep); 126129198Scognet return (0); 127129198Scognet} 128129198Scognet 129147166Scognetstatic int 130147166Scognetnexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih) 131147166Scognet{ 132129198Scognet 133182933Sraj return (arm_remove_irqhandler(rman_get_start(r), ih)); 134147166Scognet} 135147166Scognet 136129198Scognetstatic int 137129198Scognetnexus_attach(device_t dev) 138129198Scognet{ 139182934Sraj 140209232Sraj mem_rman.rm_start = 0; 141209232Sraj mem_rman.rm_end = ~0u; 142209232Sraj mem_rman.rm_type = RMAN_ARRAY; 143209232Sraj mem_rman.rm_descr = "I/O memory addresses"; 144209232Sraj if (rman_init(&mem_rman) || rman_manage_region(&mem_rman, 0, ~0u)) 145209232Sraj panic("nexus_probe mem_rman"); 146209232Sraj 147129198Scognet /* 148129198Scognet * First, deal with the children we know about already 149129198Scognet */ 150129198Scognet bus_generic_probe(dev); 151129198Scognet bus_generic_attach(dev); 152182934Sraj 153182934Sraj return (0); 154129198Scognet} 155129198Scognet 156129198Scognet 157129198Scognetstatic int 158129198Scognetnexus_print_child(device_t bus, device_t child) 159129198Scognet{ 160129198Scognet int retval = 0; 161182934Sraj 162129198Scognet retval += bus_print_child_header(bus, child); 163129198Scognet retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */ 164182934Sraj 165129198Scognet return (retval); 166129198Scognet} 167129198Scognet 168129198Scognetstatic device_t 169212413Savgnexus_add_child(device_t bus, u_int order, const char *name, int unit) 170129198Scognet{ 171182934Sraj device_t child; 172129198Scognet struct nexus_device *ndev; 173182934Sraj 174129198Scognet ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 175129198Scognet if (!ndev) 176182934Sraj return (0); 177129198Scognet resource_list_init(&ndev->nx_resources); 178129198Scognet 179129198Scognet child = device_add_child_ordered(bus, order, name, unit); 180182934Sraj 181129198Scognet /* should we free this in nexus_child_detached? */ 182129198Scognet device_set_ivars(child, ndev); 183182934Sraj 184182934Sraj return (child); 185129198Scognet} 186129198Scognet 187129198Scognet 188129198Scognet/* 189129198Scognet * Allocate a resource on behalf of child. NB: child is usually going to be a 190129198Scognet * child of one of our descendants, not a direct child of nexus0. 191129198Scognet * (Exceptions include footbridge.) 192129198Scognet */ 193129198Scognet#define ARM_BUS_SPACE_MEM 1 194129198Scognetstatic struct resource * 195129198Scognetnexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 196182934Sraj u_long start, u_long end, u_long count, u_int flags) 197129198Scognet{ 198129198Scognet struct resource *rv; 199129198Scognet struct rman *rm; 200129198Scognet int needactivate = flags & RF_ACTIVE; 201129198Scognet 202129198Scognet switch (type) { 203129198Scognet case SYS_RES_MEMORY: 204129198Scognet rm = &mem_rman; 205129198Scognet break; 206182934Sraj 207129198Scognet default: 208182934Sraj return (0); 209129198Scognet } 210129198Scognet 211129198Scognet rv = rman_reserve_resource(rm, start, end, count, flags, child); 212129198Scognet if (rv == 0) 213182934Sraj return (0); 214129198Scognet 215157891Simp rman_set_rid(rv, *rid); 216129198Scognet rman_set_bustag(rv, (void*)ARM_BUS_SPACE_MEM); 217182934Sraj rman_set_bushandle(rv, rman_get_start(rv)); 218182934Sraj 219129198Scognet if (needactivate) { 220129198Scognet if (bus_activate_resource(child, type, *rid, rv)) { 221129198Scognet rman_release_resource(rv); 222182934Sraj return (0); 223129198Scognet } 224129198Scognet } 225182934Sraj 226182934Sraj return (rv); 227129198Scognet} 228129198Scognet 229129198Scognet 230129198Scognetstatic int 231129198Scognetnexus_activate_resource(device_t bus, device_t child, int type, int rid, 232182934Sraj struct resource *r) 233129198Scognet{ 234129198Scognet /* 235129198Scognet * If this is a memory resource, map it into the kernel. 236129198Scognet */ 237129198Scognet if (rman_get_bustag(r) == (void*)ARM_BUS_SPACE_MEM) { 238129198Scognet caddr_t vaddr = 0; 239129198Scognet u_int32_t paddr; 240129198Scognet u_int32_t psize; 241129198Scognet u_int32_t poffs; 242182934Sraj 243129198Scognet paddr = rman_get_start(r); 244129198Scognet psize = rman_get_size(r); 245129198Scognet poffs = paddr - trunc_page(paddr); 246129198Scognet vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs; 247129198Scognet rman_set_virtual(r, vaddr); 248129198Scognet rman_set_bushandle(r, (bus_space_handle_t) vaddr); 249129198Scognet } 250129198Scognet return (rman_activate_resource(r)); 251129198Scognet} 252129198Scognet 253129198ScognetDRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0); 254