ofw_iicbus.c revision 274641
1/*- 2 * Copyright (c) 2009, Nathan Whitehorn <nwhitehorn@FreeBSD.org> 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 unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/dev/ofw/ofw_iicbus.c 274641 2014-11-18 01:54:31Z ian $"); 29 30#include <sys/param.h> 31#include <sys/bus.h> 32#include <sys/kernel.h> 33#include <sys/libkern.h> 34#include <sys/lock.h> 35#include <sys/module.h> 36#include <sys/mutex.h> 37 38#include <dev/iicbus/iicbus.h> 39#include <dev/iicbus/iiconf.h> 40#include <dev/ofw/ofw_bus.h> 41#include <dev/ofw/ofw_bus_subr.h> 42#include <dev/ofw/openfirm.h> 43 44#include "iicbus_if.h" 45 46/* Methods */ 47static device_probe_t ofw_iicbus_probe; 48static device_attach_t ofw_iicbus_attach; 49static device_t ofw_iicbus_add_child(device_t dev, u_int order, 50 const char *name, int unit); 51static const struct ofw_bus_devinfo *ofw_iicbus_get_devinfo(device_t bus, 52 device_t dev); 53 54static device_method_t ofw_iicbus_methods[] = { 55 /* Device interface */ 56 DEVMETHOD(device_probe, ofw_iicbus_probe), 57 DEVMETHOD(device_attach, ofw_iicbus_attach), 58 59 /* Bus interface */ 60 DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str), 61 DEVMETHOD(bus_add_child, ofw_iicbus_add_child), 62 63 /* ofw_bus interface */ 64 DEVMETHOD(ofw_bus_get_devinfo, ofw_iicbus_get_devinfo), 65 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 DEVMETHOD_END 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, iicbb, ofw_iicbus_driver, ofwiicbus_devclass, 0, 0); 84DRIVER_MODULE(ofw_iicbus, iichb, ofw_iicbus_driver, ofwiicbus_devclass, 0, 0); 85MODULE_VERSION(ofw_iicbus, 1); 86MODULE_DEPEND(ofw_iicbus, iicbus, 1, 1, 1); 87 88static int 89ofw_iicbus_probe(device_t dev) 90{ 91 92 if (ofw_bus_get_node(dev) == -1) 93 return (ENXIO); 94 device_set_desc(dev, "OFW I2C bus"); 95 96 return (0); 97} 98 99static int 100ofw_iicbus_attach(device_t dev) 101{ 102 struct iicbus_softc *sc = IICBUS_SOFTC(dev); 103 struct ofw_iicbus_devinfo *dinfo; 104 phandle_t child, node; 105 pcell_t freq, paddr; 106 device_t childdev; 107 108 sc->dev = dev; 109 mtx_init(&sc->lock, "iicbus", NULL, MTX_DEF); 110 111 /* 112 * If there is a clock-frequency property for the device node, use it as 113 * the starting value for the bus frequency. Then call the common 114 * routine that handles the tunable/sysctl which allows the FDT value to 115 * be overridden by the user. 116 */ 117 node = ofw_bus_get_node(dev); 118 freq = 0; 119 OF_getencprop(node, "clock-frequency", &freq, sizeof(freq)); 120 iicbus_init_frequency(dev, freq); 121 122 iicbus_reset(dev, IIC_FASTEST, 0, NULL); 123 124 bus_generic_probe(dev); 125 bus_enumerate_hinted_children(dev); 126 127 /* 128 * Attach those children represented in the device tree. 129 */ 130 for (child = OF_child(node); child != 0; child = OF_peer(child)) { 131 /* 132 * Try to get the I2C address first from the i2c-address 133 * property, then try the reg property. It moves around 134 * on different systems. 135 */ 136 if (OF_getencprop(child, "i2c-address", &paddr, 137 sizeof(paddr)) == -1) 138 if (OF_getencprop(child, "reg", &paddr, 139 sizeof(paddr)) == -1) 140 continue; 141 142 /* 143 * Now set up the I2C and OFW bus layer devinfo and add it 144 * to the bus. 145 */ 146 dinfo = malloc(sizeof(struct ofw_iicbus_devinfo), M_DEVBUF, 147 M_NOWAIT | M_ZERO); 148 if (dinfo == NULL) 149 continue; 150 dinfo->opd_dinfo.addr = paddr; 151 if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) != 152 0) { 153 free(dinfo, M_DEVBUF); 154 continue; 155 } 156 childdev = device_add_child(dev, NULL, -1); 157 device_set_ivars(childdev, dinfo); 158 } 159 160 return (bus_generic_attach(dev)); 161} 162 163static device_t 164ofw_iicbus_add_child(device_t dev, u_int order, const char *name, int unit) 165{ 166 device_t child; 167 struct ofw_iicbus_devinfo *devi; 168 169 child = device_add_child_ordered(dev, order, name, unit); 170 if (child == NULL) 171 return (child); 172 devi = malloc(sizeof(struct ofw_iicbus_devinfo), M_DEVBUF, 173 M_NOWAIT | M_ZERO); 174 if (devi == NULL) { 175 device_delete_child(dev, child); 176 return (0); 177 } 178 179 /* 180 * NULL all the OFW-related parts of the ivars for non-OFW 181 * children. 182 */ 183 devi->opd_obdinfo.obd_node = -1; 184 devi->opd_obdinfo.obd_name = NULL; 185 devi->opd_obdinfo.obd_compat = NULL; 186 devi->opd_obdinfo.obd_type = NULL; 187 devi->opd_obdinfo.obd_model = NULL; 188 189 device_set_ivars(child, devi); 190 191 return (child); 192} 193 194static const struct ofw_bus_devinfo * 195ofw_iicbus_get_devinfo(device_t bus, device_t dev) 196{ 197 struct ofw_iicbus_devinfo *dinfo; 198 199 dinfo = device_get_ivars(dev); 200 return (&dinfo->opd_obdinfo); 201} 202