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 and I/O memory address space. 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include <sys/kobj.h> 44 #include <sys/systm.h> 45 #include <sys/bus.h> 46 #include "device_if.h" 47 #include "bus_if.h" 48 #include <sys/malloc.h> 49 #include <sys/module.h> 50 #ifdef LOSCFG_DRIVERS_HDF_USB 51 #include "hdf_usb.h" 52 #endif 53 54 struct devclass_res { 55 TAILQ_ENTRY(devclass_res) link; 56 struct resource_list nx_resources; 57 char* devclass_name; 58 }; 59 TAILQ_HEAD(devclass_res_list, devclass_res); 60 static struct devclass_res_list devclass_resources; 61 62 static int nexus_probe(device_t); 63 static int nexus_attach(device_t); 64 static int nexus_print_child(device_t, device_t); 65 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *, 66 rman_res_t, rman_res_t, rman_res_t, u_int); 67 68 static device_method_t nexus_methods[] = { 69 /* Device interface */ 70 DEVMETHOD(device_probe, nexus_probe), 71 DEVMETHOD(device_attach, nexus_attach), 72 /* Bus interface */ 73 DEVMETHOD(bus_print_child, nexus_print_child), 74 DEVMETHOD(bus_add_child, bus_generic_add_child), 75 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 76 77 { 0, 0 } 78 }; 79 80 static devclass_t nexus_devclass; 81 static driver_t nexus_driver = { 82 "nexus", 83 nexus_methods, 84 1 /* no softc */ 85 }; 86 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0, 87 BUS_PASS_BUS + BUS_PASS_ORDER_EARLY); 88 89 static struct resource_list *get_resource_list(const char *devclass_name) 90 { 91 struct devclass_res *dr = NULL; 92 if (devclass_name == NULL) { 93 return (NULL); 94 } 95 TAILQ_FOREACH(dr, &devclass_resources, link) { 96 if (!strcmp(dr->devclass_name, devclass_name)) { 97 break; 98 } 99 } 100 if (dr == NULL) { 101 dr = malloc(sizeof(struct devclass_res) + strlen(devclass_name) + 1); 102 if (dr == NULL) { 103 return (NULL); 104 } 105 dr->devclass_name = (char *)(dr + 1); 106 (void)strcpy_s(dr->devclass_name, strlen(devclass_name) + 1, devclass_name); 107 resource_list_init(&dr->nx_resources); 108 TAILQ_INSERT_TAIL(&devclass_resources, dr, link); 109 } 110 return (&dr->nx_resources); 111 } 112 113 static void add_resource(const char *devclass_name, int type, int unit, rman_res_t start, rman_res_t end, 114 rman_res_t count) 115 { 116 struct resource_list *res_list = get_resource_list(devclass_name); 117 if (res_list == NULL) { 118 return; 119 } 120 resource_list_add(res_list, type, unit, start, end, count); 121 } 122 123 int 124 nexus_init(void) 125 { 126 TAILQ_INIT(&devclass_resources); 127 #ifdef LOSCFG_DRIVERS_HDF_USB 128 UsbResourceInit(nexus, add_resource); 129 #endif 130 machine_resource_init(add_resource); 131 132 return driver_module_handler(NULL, MOD_LOAD, &nexus_root_driver_mod); 133 } 134 135 static int 136 nexus_probe(device_t dev) 137 { 138 device_quiet(dev); /* suppress attach message for neatness */ 139 140 return (BUS_PROBE_DEFAULT); 141 } 142 143 static int 144 nexus_attach(device_t dev) 145 { 146 /* 147 * First, deal with the children we know about already 148 */ 149 bus_generic_probe(dev); 150 bus_generic_attach(dev); 151 152 return (0); 153 } 154 155 static int 156 nexus_print_child(device_t bus, device_t child) 157 { 158 int retval = 0; 159 160 retval += bus_print_child_header(bus, child); 161 retval += printf("\n"); 162 163 return (retval); 164 } 165 166 /* 167 * Allocate a resource on behalf of child. NB: child is usually going to be a 168 * child of one of our descendants, not a direct child of nexus0. 169 * (Exceptions include footbridge.) 170 */ 171 static struct resource * 172 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 173 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 174 { 175 devclass_t dc = device_get_devclass(child); 176 struct resource_list *res_list = NULL; 177 if (dc == NULL || rid == NULL) { 178 return (NULL); 179 } 180 res_list = get_resource_list(devclass_get_name(dc)); 181 if (res_list == NULL) { 182 return (NULL); 183 } 184 struct resource_list_entry *rle = resource_list_find(res_list, type, *rid); 185 if (rle == NULL) { 186 return(NULL); 187 } 188 return (rle->res); 189 } 190