ofw_iicbus.c revision 189280
1155324Simp/*- 2185305Simp * Copyright (c) 2009, Nathan Whitehorn <nwhitehorn@FreeBSD.org> 3238415Simp * All rights reserved. 4155324Simp * 5155324Simp * Redistribution and use in source and binary forms, with or without 6155324Simp * modification, are permitted provided that the following conditions 7155324Simp * are met: 8155324Simp * 1. Redistributions of source code must retain the above copyright 9155324Simp * notice unmodified, this list of conditions, and the following 10155324Simp * disclaimer. 11155324Simp * 2. Redistributions in binary form must reproduce the above copyright 12155324Simp * notice, this list of conditions and the following disclaimer in the 13155324Simp * documentation and/or other materials provided with the distribution. 14185305Simp * 15185305Simp * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16185305Simp * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17185305Simp * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18185305Simp * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19185305Simp * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20185305Simp * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21155324Simp * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22155324Simp * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23155324Simp * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24155324Simp * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25155324Simp */ 26155324Simp 27155324Simp#include <sys/cdefs.h> 28155324Simp__FBSDID("$FreeBSD: head/sys/dev/ofw/ofw_iicbus.c 189280 2009-03-02 15:22:01Z nwhitehorn $"); 29155324Simp 30155324Simp#include <sys/param.h> 31155324Simp#include <sys/bus.h> 32238189Simp#include <sys/kernel.h> 33185305Simp#include <sys/libkern.h> 34238415Simp#include <sys/lock.h> 35155324Simp#include <sys/module.h> 36238415Simp#include <sys/mutex.h> 37155324Simp 38238189Simp#include <dev/iicbus/iicbus.h> 39160363Simp#include <dev/iicbus/iiconf.h> 40160363Simp#include <dev/ofw/ofw_bus.h> 41238415Simp#include <dev/ofw/ofw_bus_subr.h> 42238415Simp#include <dev/ofw/openfirm.h> 43238415Simp 44160363Simp#include "iicbus_if.h" 45238439Simp 46238439Simp/* Methods */ 47238439Simpstatic device_probe_t ofw_iicbus_probe; 48160363Simpstatic device_attach_t ofw_iicbus_attach; 49238439Simpstatic device_t ofw_iicbus_add_child(device_t dev, int order, const char *name, 50238439Simp int unit); 51160363Simpstatic const struct ofw_bus_devinfo *ofw_iicbus_get_devinfo(device_t bus, 52238465Simp device_t dev); 53238465Simp 54238465Simpstatic device_method_t ofw_iicbus_methods[] = { 55238465Simp /* Device interface */ 56238465Simp DEVMETHOD(device_probe, ofw_iicbus_probe), 57238465Simp DEVMETHOD(device_attach, ofw_iicbus_attach), 58238465Simp 59238465Simp /* Bus interface */ 60238465Simp DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str), 61238465Simp DEVMETHOD(bus_add_child, ofw_iicbus_add_child), 62185305Simp 63160363Simp /* ofw_bus interface */ 64238189Simp DEVMETHOD(ofw_bus_get_devinfo, ofw_iicbus_get_devinfo), 65238189Simp DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat), 66 DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model), 67 DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name), 68 DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node), 69 DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type), 70 71 { 0, 0 } 72}; 73 74struct ofw_iicbus_devinfo { 75 struct iicbus_ivar opd_dinfo; 76 struct ofw_bus_devinfo opd_obdinfo; 77}; 78 79static devclass_t ofwiicbus_devclass; 80 81DEFINE_CLASS_1(iicbus, ofw_iicbus_driver, ofw_iicbus_methods, 82 sizeof(struct iicbus_softc), iicbus_driver); 83DRIVER_MODULE(ofw_iicbus, iichb, ofw_iicbus_driver, ofwiicbus_devclass, 0, 0); 84MODULE_VERSION(ofw_iicbus, 1); 85MODULE_DEPEND(ofw_iicbus, iicbus, 1, 1, 1); 86 87static int 88ofw_iicbus_probe(device_t dev) 89{ 90 91 if (ofw_bus_get_node(dev) == 0) 92 return (ENXIO); 93 device_set_desc(dev, "OFW I2C bus"); 94 95 return (0); 96} 97 98static int 99ofw_iicbus_attach(device_t dev) 100{ 101 struct iicbus_softc *sc = IICBUS_SOFTC(dev); 102 struct ofw_iicbus_devinfo *dinfo; 103 phandle_t node, child; 104 device_t childdev; 105 uint32_t addr; 106 107 sc->dev = dev; 108 mtx_init(&sc->lock, "iicbus", NULL, MTX_DEF); 109 iicbus_reset(dev, IIC_FASTEST, 0, NULL); 110 111 bus_generic_probe(dev); 112 bus_enumerate_hinted_children(dev); 113 114 /* 115 * Attach those children represented in the device tree. 116 */ 117 118 node = ofw_bus_get_node(dev); 119 120 for (child = OF_child(node); child != 0; child = OF_peer(child)) { 121 /* 122 * Try to get the I2C address first from the i2c-address 123 * property, then try the reg property. It moves around 124 * on different systems. 125 */ 126 127 if (OF_getprop(child, "i2c-address", &addr, sizeof(addr)) == -1) 128 if (OF_getprop(child, "reg", &addr, sizeof(addr)) == -1) 129 continue; 130 131 /* 132 * Now set up the I2C and OFW bus layer devinfo and add it 133 * to the bus. 134 */ 135 136 dinfo = malloc(sizeof(struct ofw_iicbus_devinfo), M_DEVBUF, 137 M_NOWAIT | M_ZERO); 138 if (dinfo == NULL) 139 continue; 140 dinfo->opd_dinfo.addr = addr; 141 if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) != 142 0) { 143 free(dinfo, M_DEVBUF); 144 continue; 145 } 146 childdev = device_add_child(dev, NULL, -1); 147 device_set_ivars(childdev, dinfo); 148 } 149 150 return (bus_generic_attach(dev)); 151} 152 153static device_t 154ofw_iicbus_add_child(device_t dev, int order, const char *name, int unit) 155{ 156 device_t child; 157 struct ofw_iicbus_devinfo *devi; 158 159 child = device_add_child_ordered(dev, order, name, unit); 160 if (child == NULL) 161 return (child); 162 devi = malloc(sizeof(struct ofw_iicbus_devinfo), M_DEVBUF, 163 M_NOWAIT | M_ZERO); 164 if (devi == NULL) { 165 device_delete_child(dev, child); 166 return (0); 167 } 168 169 /* NULL all the OFW-related parts of the ivars for non-OFW children */ 170 171 devi->opd_obdinfo.obd_node = -1; 172 devi->opd_obdinfo.obd_name = NULL; 173 devi->opd_obdinfo.obd_compat = NULL; 174 devi->opd_obdinfo.obd_type = NULL; 175 devi->opd_obdinfo.obd_model = NULL; 176 177 device_set_ivars(child, devi); 178 179 return (child); 180} 181 182static const struct ofw_bus_devinfo * 183ofw_iicbus_get_devinfo(device_t bus, device_t dev) 184{ 185 struct ofw_iicbus_devinfo *dinfo; 186 187 dinfo = device_get_ivars(dev); 188 return (&dinfo->opd_obdinfo); 189} 190 191