1 /*- 2 * Copyright (c) 2006 M. Warner Losh 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/malloc.h> 34 #include <sys/module.h> 35 #include <sys/kernel.h> 36 #include <sys/queue.h> 37 #include <sys/sysctl.h> 38 #include <sys/types.h> 39 40 #include <sys/bus.h> 41 #include <machine/bus.h> 42 #include <sys/rman.h> 43 #include <machine/resource.h> 44 45 #include <dev/spibus/spibusvar.h> 46 #include <dev/spibus/spi.h> 47 #include "spibus_if.h" 48 49 static int 50 spibus_probe(device_t dev) 51 { 52 device_set_desc(dev, "spibus bus"); 53 return (BUS_PROBE_GENERIC); 54 } 55 56 static int 57 spibus_attach(device_t dev) 58 { 59 struct spibus_softc *sc = SPIBUS_SOFTC(dev); 60 61 sc->dev = dev; 62 bus_enumerate_hinted_children(dev); 63 return (bus_generic_attach(dev)); 64 } 65 66 /* 67 * Since this is not a self-enumerating bus, and since we always add 68 * children in attach, we have to always delete children here. 69 */ 70 static int 71 spibus_detach(device_t dev) 72 { 73 int err, ndevs, i; 74 device_t *devlist; 75 76 if ((err = bus_generic_detach(dev)) != 0) 77 return (err); 78 if ((err = device_get_children(dev, &devlist, &ndevs)) != 0) 79 return (err); 80 for (i = 0; i < ndevs; i++) 81 device_delete_child(dev, devlist[i]); 82 free(devlist, M_TEMP); 83 84 return (0); 85 } 86 87 static int 88 spibus_suspend(device_t dev) 89 { 90 return (bus_generic_suspend(dev)); 91 } 92 93 static 94 int 95 spibus_resume(device_t dev) 96 { 97 return (bus_generic_resume(dev)); 98 } 99 100 static int 101 spibus_print_child(device_t dev, device_t child) 102 { 103 struct spibus_ivar *devi = SPIBUS_IVAR(child); 104 int retval = 0; 105 106 retval += bus_print_child_header(dev, child); 107 retval += printf(" at cs %d", devi->cs); 108 retval += printf(" mode %d", devi->mode); 109 retval += bus_print_child_footer(dev, child); 110 111 return (retval); 112 } 113 114 static void 115 spibus_probe_nomatch(device_t bus, device_t child) 116 { 117 struct spibus_ivar *devi = SPIBUS_IVAR(child); 118 119 device_printf(bus, "<unknown card> at cs %d mode %d\n", devi->cs, 120 devi->mode); 121 return; 122 } 123 124 static int 125 spibus_child_location_str(device_t bus, device_t child, char *buf, 126 size_t buflen) 127 { 128 struct spibus_ivar *devi = SPIBUS_IVAR(child); 129 130 snprintf(buf, buflen, "cs=%d", devi->cs); 131 return (0); 132 } 133 134 static int 135 spibus_child_pnpinfo_str(device_t bus, device_t child, char *buf, 136 size_t buflen) 137 { 138 *buf = '\0'; 139 return (0); 140 } 141 142 static int 143 spibus_read_ivar(device_t bus, device_t child, int which, uintptr_t *result) 144 { 145 struct spibus_ivar *devi = SPIBUS_IVAR(child); 146 147 switch (which) { 148 default: 149 return (EINVAL); 150 case SPIBUS_IVAR_CS: 151 *(uint32_t *)result = devi->cs; 152 break; 153 case SPIBUS_IVAR_MODE: 154 *(uint32_t *)result = devi->mode; 155 break; 156 case SPIBUS_IVAR_CLOCK: 157 *(uint32_t *)result = devi->clock; 158 break; 159 } 160 return (0); 161 } 162 163 static device_t 164 spibus_add_child(device_t dev, u_int order, const char *name, int unit) 165 { 166 device_t child; 167 struct spibus_ivar *devi; 168 169 child = device_add_child_ordered(dev, order, name, unit); 170 if (child == NULL) 171 return (child); 172 devi = malloc(sizeof(struct spibus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO); 173 if (devi == NULL) { 174 device_delete_child(dev, child); 175 return (0); 176 } 177 device_set_ivars(child, devi); 178 return (child); 179 } 180 181 static void 182 spibus_hinted_child(device_t bus, const char *dname, int dunit) 183 { 184 device_t child; 185 struct spibus_ivar *devi; 186 187 child = BUS_ADD_CHILD(bus, 0, dname, dunit); 188 devi = SPIBUS_IVAR(child); 189 devi->mode = SPIBUS_MODE_NONE; 190 resource_int_value(dname, dunit, "cs", &devi->cs); 191 resource_int_value(dname, dunit, "mode", &devi->mode); 192 } 193 194 static int 195 spibus_transfer_impl(device_t dev, device_t child, struct spi_command *cmd) 196 { 197 return (SPIBUS_TRANSFER(device_get_parent(dev), child, cmd)); 198 } 199 200 static device_method_t spibus_methods[] = { 201 /* Device interface */ 202 DEVMETHOD(device_probe, spibus_probe), 203 DEVMETHOD(device_attach, spibus_attach), 204 DEVMETHOD(device_detach, spibus_detach), 205 DEVMETHOD(device_shutdown, bus_generic_shutdown), 206 DEVMETHOD(device_suspend, spibus_suspend), 207 DEVMETHOD(device_resume, spibus_resume), 208 209 /* Bus interface */ 210 DEVMETHOD(bus_add_child, spibus_add_child), 211 DEVMETHOD(bus_print_child, spibus_print_child), 212 DEVMETHOD(bus_probe_nomatch, spibus_probe_nomatch), 213 DEVMETHOD(bus_read_ivar, spibus_read_ivar), 214 DEVMETHOD(bus_child_pnpinfo_str, spibus_child_pnpinfo_str), 215 DEVMETHOD(bus_child_location_str, spibus_child_location_str), 216 DEVMETHOD(bus_hinted_child, spibus_hinted_child), 217 218 /* spibus interface */ 219 DEVMETHOD(spibus_transfer, spibus_transfer_impl), 220 221 DEVMETHOD_END 222 }; 223 224 driver_t spibus_driver = { 225 "spibus", 226 spibus_methods, 227 sizeof(struct spibus_softc) 228 }; 229 230 devclass_t spibus_devclass; 231 232 DRIVER_MODULE(spibus, spi, spibus_driver, spibus_devclass, 0, 0); 233 MODULE_VERSION(spibus, 1); 234