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("$FreeBSD$"); 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 */ 47 static device_probe_t ofw_iicbus_probe; 48 static device_attach_t ofw_iicbus_attach; 49 static device_t ofw_iicbus_add_child(device_t dev, u_int order, 50 const char *name, int unit); 51 static const struct ofw_bus_devinfo *ofw_iicbus_get_devinfo(device_t bus, 52 device_t dev); 53 54 static 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 74 struct ofw_iicbus_devinfo { 75 struct iicbus_ivar opd_dinfo; /* Must be the first. */ 76 struct ofw_bus_devinfo opd_obdinfo; 77 }; 78 79 devclass_t ofwiicbus_devclass; 80 81 DEFINE_CLASS_1(iicbus, ofw_iicbus_driver, ofw_iicbus_methods, 82 sizeof(struct iicbus_softc), iicbus_driver); 83 EARLY_DRIVER_MODULE(ofw_iicbus, iicbb, ofw_iicbus_driver, ofwiicbus_devclass, 84 0, 0, BUS_PASS_BUS); 85 EARLY_DRIVER_MODULE(ofw_iicbus, iichb, ofw_iicbus_driver, ofwiicbus_devclass, 86 0, 0, BUS_PASS_BUS); 87 EARLY_DRIVER_MODULE(ofw_iicbus, twsi, ofw_iicbus_driver, ofwiicbus_devclass, 88 0, 0, BUS_PASS_BUS); 89 MODULE_VERSION(ofw_iicbus, 1); 90 MODULE_DEPEND(ofw_iicbus, iicbus, 1, 1, 1); 91 92 static int 93 ofw_iicbus_probe(device_t dev) 94 { 95 96 if (ofw_bus_get_node(dev) == -1) 97 return (ENXIO); 98 device_set_desc(dev, "OFW I2C bus"); 99 100 return (0); 101 } 102 103 static int 104 ofw_iicbus_attach(device_t dev) 105 { 106 struct iicbus_softc *sc = IICBUS_SOFTC(dev); 107 struct ofw_iicbus_devinfo *dinfo; 108 phandle_t child, node, root; 109 pcell_t freq, paddr; 110 device_t childdev; 111 ssize_t compatlen; 112 char compat[255]; 113 char *curstr; 114 u_int iic_addr_8bit = 0; 115 116 sc->dev = dev; 117 mtx_init(&sc->lock, "iicbus", NULL, MTX_DEF); 118 119 /* 120 * If there is a clock-frequency property for the device node, use it as 121 * the starting value for the bus frequency. Then call the common 122 * routine that handles the tunable/sysctl which allows the FDT value to 123 * be overridden by the user. 124 */ 125 node = ofw_bus_get_node(dev); 126 freq = 0; 127 OF_getencprop(node, "clock-frequency", &freq, sizeof(freq)); 128 iicbus_init_frequency(dev, freq); 129 130 iicbus_reset(dev, IIC_FASTEST, 0, NULL); 131 132 bus_generic_probe(dev); 133 bus_enumerate_hinted_children(dev); 134 135 /* 136 * Check if we're running on a PowerMac, needed for the I2C 137 * address below. 138 */ 139 root = OF_peer(0); 140 compatlen = OF_getprop(root, "compatible", compat, 141 sizeof(compat)); 142 if (compatlen != -1) { 143 for (curstr = compat; curstr < compat + compatlen; 144 curstr += strlen(curstr) + 1) { 145 if (strncmp(curstr, "MacRISC", 7) == 0) 146 iic_addr_8bit = 1; 147 } 148 } 149 150 /* 151 * Attach those children represented in the device tree. 152 */ 153 for (child = OF_child(node); child != 0; child = OF_peer(child)) { 154 /* 155 * Try to get the I2C address first from the i2c-address 156 * property, then try the reg property. It moves around 157 * on different systems. 158 */ 159 if (OF_getencprop(child, "i2c-address", &paddr, 160 sizeof(paddr)) == -1) 161 if (OF_getencprop(child, "reg", &paddr, 162 sizeof(paddr)) == -1) 163 continue; 164 165 /* 166 * Now set up the I2C and OFW bus layer devinfo and add it 167 * to the bus. 168 */ 169 dinfo = malloc(sizeof(struct ofw_iicbus_devinfo), M_DEVBUF, 170 M_NOWAIT | M_ZERO); 171 if (dinfo == NULL) 172 continue; 173 /* 174 * FreeBSD drivers expect I2C addresses to be expressed as 175 * 8-bit values. Apple OFW data contains 8-bit values, but 176 * Linux FDT data contains 7-bit values, so shift them up to 177 * 8-bit format. 178 */ 179 if (iic_addr_8bit) 180 dinfo->opd_dinfo.addr = paddr; 181 else 182 dinfo->opd_dinfo.addr = paddr << 1; 183 184 if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) != 185 0) { 186 free(dinfo, M_DEVBUF); 187 continue; 188 } 189 190 childdev = device_add_child(dev, NULL, -1); 191 resource_list_init(&dinfo->opd_dinfo.rl); 192 ofw_bus_intr_to_rl(childdev, child, 193 &dinfo->opd_dinfo.rl, NULL); 194 device_set_ivars(childdev, dinfo); 195 } 196 197 /* Register bus */ 198 OF_device_register_xref(OF_xref_from_node(node), dev); 199 return (bus_generic_attach(dev)); 200 } 201 202 static device_t 203 ofw_iicbus_add_child(device_t dev, u_int order, const char *name, int unit) 204 { 205 device_t child; 206 struct ofw_iicbus_devinfo *devi; 207 208 child = device_add_child_ordered(dev, order, name, unit); 209 if (child == NULL) 210 return (child); 211 devi = malloc(sizeof(struct ofw_iicbus_devinfo), M_DEVBUF, 212 M_NOWAIT | M_ZERO); 213 if (devi == NULL) { 214 device_delete_child(dev, child); 215 return (0); 216 } 217 218 /* 219 * NULL all the OFW-related parts of the ivars for non-OFW 220 * children. 221 */ 222 devi->opd_obdinfo.obd_node = -1; 223 devi->opd_obdinfo.obd_name = NULL; 224 devi->opd_obdinfo.obd_compat = NULL; 225 devi->opd_obdinfo.obd_type = NULL; 226 devi->opd_obdinfo.obd_model = NULL; 227 228 device_set_ivars(child, devi); 229 230 return (child); 231 } 232 233 static const struct ofw_bus_devinfo * 234 ofw_iicbus_get_devinfo(device_t bus, device_t dev) 235 { 236 struct ofw_iicbus_devinfo *dinfo; 237 238 dinfo = device_get_ivars(dev); 239 return (&dinfo->opd_obdinfo); 240 } 241