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 += bus_print_child_footer(dev, child); 109 110 return (retval); 111 } 112 113 static void 114 spibus_probe_nomatch(device_t bus, device_t child) 115 { 116 struct spibus_ivar *devi = SPIBUS_IVAR(child); 117 118 device_printf(bus, "<unknown card>"); 119 printf(" at cs %d\n", devi->cs); 120 return; 121 } 122 123 static int 124 spibus_child_location_str(device_t bus, device_t child, char *buf, 125 size_t buflen) 126 { 127 struct spibus_ivar *devi = SPIBUS_IVAR(child); 128 129 snprintf(buf, buflen, "cs=%d", devi->cs); 130 return (0); 131 } 132 133 static int 134 spibus_child_pnpinfo_str(device_t bus, device_t child, char *buf, 135 size_t buflen) 136 { 137 *buf = '\0'; 138 return (0); 139 } 140 141 static int 142 spibus_read_ivar(device_t bus, device_t child, int which, u_int *result) 143 { 144 struct spibus_ivar *devi = SPIBUS_IVAR(child); 145 146 switch (which) { 147 default: 148 return (EINVAL); 149 case SPIBUS_IVAR_CS: 150 *(uint32_t *)result = devi->cs; 151 break; 152 } 153 return (0); 154 } 155 156 static device_t 157 spibus_add_child(device_t dev, u_int order, const char *name, int unit) 158 { 159 device_t child; 160 struct spibus_ivar *devi; 161 162 child = device_add_child_ordered(dev, order, name, unit); 163 if (child == NULL) 164 return (child); 165 devi = malloc(sizeof(struct spibus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO); 166 if (devi == NULL) { 167 device_delete_child(dev, child); 168 return (0); 169 } 170 device_set_ivars(child, devi); 171 return (child); 172 } 173 174 static void 175 spibus_hinted_child(device_t bus, const char *dname, int dunit) 176 { 177 device_t child; 178 struct spibus_ivar *devi; 179 180 child = BUS_ADD_CHILD(bus, 0, dname, dunit); 181 devi = SPIBUS_IVAR(child); 182 resource_int_value(dname, dunit, "cs", &devi->cs); 183 } 184 185 static int 186 spibus_transfer_impl(device_t dev, device_t child, struct spi_command *cmd) 187 { 188 return (SPIBUS_TRANSFER(device_get_parent(dev), child, cmd)); 189 } 190 191 static device_method_t spibus_methods[] = { 192 /* Device interface */ 193 DEVMETHOD(device_probe, spibus_probe), 194 DEVMETHOD(device_attach, spibus_attach), 195 DEVMETHOD(device_detach, spibus_detach), 196 DEVMETHOD(device_shutdown, bus_generic_shutdown), 197 DEVMETHOD(device_suspend, spibus_suspend), 198 DEVMETHOD(device_resume, spibus_resume), 199 200 /* Bus interface */ 201 DEVMETHOD(bus_add_child, spibus_add_child), 202 DEVMETHOD(bus_print_child, spibus_print_child), 203 DEVMETHOD(bus_probe_nomatch, spibus_probe_nomatch), 204 DEVMETHOD(bus_read_ivar, spibus_read_ivar), 205 DEVMETHOD(bus_child_pnpinfo_str, spibus_child_pnpinfo_str), 206 DEVMETHOD(bus_child_location_str, spibus_child_location_str), 207 DEVMETHOD(bus_hinted_child, spibus_hinted_child), 208 209 /* spibus interface */ 210 DEVMETHOD(spibus_transfer, spibus_transfer_impl), 211 212 DEVMETHOD_END 213 }; 214 215 driver_t spibus_driver = { 216 "spibus", 217 spibus_methods, 218 sizeof(struct spibus_softc) 219 }; 220 221 devclass_t spibus_devclass; 222 223 DRIVER_MODULE(spibus, spi, spibus_driver, spibus_devclass, 0, 0); 224 MODULE_VERSION(spibus, 1); 225