1187261Snwhitehorn/*- 2187261Snwhitehorn * Copyright (c) 2009, Nathan Whitehorn <nwhitehorn@FreeBSD.org> 3187261Snwhitehorn * All rights reserved. 4187261Snwhitehorn * 5187261Snwhitehorn * Redistribution and use in source and binary forms, with or without 6187261Snwhitehorn * modification, are permitted provided that the following conditions 7187261Snwhitehorn * are met: 8187261Snwhitehorn * 1. Redistributions of source code must retain the above copyright 9187261Snwhitehorn * notice unmodified, this list of conditions, and the following 10187261Snwhitehorn * disclaimer. 11187261Snwhitehorn * 2. Redistributions in binary form must reproduce the above copyright 12187261Snwhitehorn * notice, this list of conditions and the following disclaimer in the 13187261Snwhitehorn * documentation and/or other materials provided with the distribution. 14187261Snwhitehorn * 15187261Snwhitehorn * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16187261Snwhitehorn * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17187261Snwhitehorn * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18187261Snwhitehorn * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19187261Snwhitehorn * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20187261Snwhitehorn * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21187261Snwhitehorn * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22187261Snwhitehorn * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23187261Snwhitehorn * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24187261Snwhitehorn * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25187261Snwhitehorn */ 26187261Snwhitehorn 27187261Snwhitehorn#include <sys/cdefs.h> 28187261Snwhitehorn__FBSDID("$FreeBSD: stable/11/sys/dev/iicbus/ofw_iicbus.c 331501 2018-03-24 22:39:38Z ian $"); 29187261Snwhitehorn 30187261Snwhitehorn#include <sys/param.h> 31187261Snwhitehorn#include <sys/bus.h> 32187261Snwhitehorn#include <sys/kernel.h> 33187261Snwhitehorn#include <sys/libkern.h> 34187261Snwhitehorn#include <sys/lock.h> 35187261Snwhitehorn#include <sys/module.h> 36187261Snwhitehorn#include <sys/mutex.h> 37187261Snwhitehorn 38187261Snwhitehorn#include <dev/iicbus/iicbus.h> 39187261Snwhitehorn#include <dev/iicbus/iiconf.h> 40187261Snwhitehorn#include <dev/ofw/ofw_bus.h> 41187261Snwhitehorn#include <dev/ofw/ofw_bus_subr.h> 42187261Snwhitehorn#include <dev/ofw/openfirm.h> 43187261Snwhitehorn 44187261Snwhitehorn#include "iicbus_if.h" 45187261Snwhitehorn 46187261Snwhitehorn/* Methods */ 47187261Snwhitehornstatic device_probe_t ofw_iicbus_probe; 48187261Snwhitehornstatic device_attach_t ofw_iicbus_attach; 49212413Savgstatic device_t ofw_iicbus_add_child(device_t dev, u_int order, 50212413Savg const char *name, int unit); 51187261Snwhitehornstatic const struct ofw_bus_devinfo *ofw_iicbus_get_devinfo(device_t bus, 52187261Snwhitehorn device_t dev); 53187261Snwhitehorn 54187261Snwhitehornstatic device_method_t ofw_iicbus_methods[] = { 55187261Snwhitehorn /* Device interface */ 56187261Snwhitehorn DEVMETHOD(device_probe, ofw_iicbus_probe), 57187261Snwhitehorn DEVMETHOD(device_attach, ofw_iicbus_attach), 58187261Snwhitehorn 59187261Snwhitehorn /* Bus interface */ 60187261Snwhitehorn DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str), 61187261Snwhitehorn DEVMETHOD(bus_add_child, ofw_iicbus_add_child), 62187261Snwhitehorn 63187261Snwhitehorn /* ofw_bus interface */ 64187261Snwhitehorn DEVMETHOD(ofw_bus_get_devinfo, ofw_iicbus_get_devinfo), 65187261Snwhitehorn DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat), 66187261Snwhitehorn DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model), 67187261Snwhitehorn DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name), 68187261Snwhitehorn DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node), 69187261Snwhitehorn DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type), 70187261Snwhitehorn 71227848Smarius DEVMETHOD_END 72187261Snwhitehorn}; 73187261Snwhitehorn 74187261Snwhitehornstruct ofw_iicbus_devinfo { 75282674Sloos struct iicbus_ivar opd_dinfo; /* Must be the first. */ 76187261Snwhitehorn struct ofw_bus_devinfo opd_obdinfo; 77187261Snwhitehorn}; 78187261Snwhitehorn 79331501Siandevclass_t ofw_iicbus_devclass; 80187261Snwhitehorn 81187472SnwhitehornDEFINE_CLASS_1(iicbus, ofw_iicbus_driver, ofw_iicbus_methods, 82187472Snwhitehorn sizeof(struct iicbus_softc), iicbus_driver); 83331501SianEARLY_DRIVER_MODULE(ofw_iicbus, iicbb, ofw_iicbus_driver, ofw_iicbus_devclass, 84296901Smmel 0, 0, BUS_PASS_BUS); 85331501SianEARLY_DRIVER_MODULE(ofw_iicbus, iichb, ofw_iicbus_driver, ofw_iicbus_devclass, 86296901Smmel 0, 0, BUS_PASS_BUS); 87331501SianEARLY_DRIVER_MODULE(ofw_iicbus, twsi, ofw_iicbus_driver, ofw_iicbus_devclass, 88331501Sian 0, 0, BUS_PASS_BUS); 89187261SnwhitehornMODULE_VERSION(ofw_iicbus, 1); 90187261SnwhitehornMODULE_DEPEND(ofw_iicbus, iicbus, 1, 1, 1); 91187261Snwhitehorn 92187261Snwhitehornstatic int 93187261Snwhitehornofw_iicbus_probe(device_t dev) 94187261Snwhitehorn{ 95187261Snwhitehorn 96233018Snwhitehorn if (ofw_bus_get_node(dev) == -1) 97187261Snwhitehorn return (ENXIO); 98187261Snwhitehorn device_set_desc(dev, "OFW I2C bus"); 99187261Snwhitehorn 100187261Snwhitehorn return (0); 101187261Snwhitehorn} 102187261Snwhitehorn 103187261Snwhitehornstatic int 104187261Snwhitehornofw_iicbus_attach(device_t dev) 105187261Snwhitehorn{ 106187261Snwhitehorn struct iicbus_softc *sc = IICBUS_SOFTC(dev); 107187261Snwhitehorn struct ofw_iicbus_devinfo *dinfo; 108290557Sandreast phandle_t child, node, root; 109274641Sian pcell_t freq, paddr; 110187261Snwhitehorn device_t childdev; 111290557Sandreast ssize_t compatlen; 112290557Sandreast char compat[255]; 113290557Sandreast char *curstr; 114290557Sandreast u_int iic_addr_8bit = 0; 115187261Snwhitehorn 116187261Snwhitehorn sc->dev = dev; 117187261Snwhitehorn mtx_init(&sc->lock, "iicbus", NULL, MTX_DEF); 118274641Sian 119274641Sian /* 120274641Sian * If there is a clock-frequency property for the device node, use it as 121274641Sian * the starting value for the bus frequency. Then call the common 122274641Sian * routine that handles the tunable/sysctl which allows the FDT value to 123274641Sian * be overridden by the user. 124274641Sian */ 125274641Sian node = ofw_bus_get_node(dev); 126274641Sian freq = 0; 127274641Sian OF_getencprop(node, "clock-frequency", &freq, sizeof(freq)); 128274641Sian iicbus_init_frequency(dev, freq); 129274641Sian 130187261Snwhitehorn iicbus_reset(dev, IIC_FASTEST, 0, NULL); 131187261Snwhitehorn 132187261Snwhitehorn bus_generic_probe(dev); 133187261Snwhitehorn bus_enumerate_hinted_children(dev); 134187261Snwhitehorn 135187261Snwhitehorn /* 136290557Sandreast * Check if we're running on a PowerMac, needed for the I2C 137290557Sandreast * address below. 138290557Sandreast */ 139290557Sandreast root = OF_peer(0); 140290557Sandreast compatlen = OF_getprop(root, "compatible", compat, 141290557Sandreast sizeof(compat)); 142290557Sandreast if (compatlen != -1) { 143290557Sandreast for (curstr = compat; curstr < compat + compatlen; 144290557Sandreast curstr += strlen(curstr) + 1) { 145290557Sandreast if (strncmp(curstr, "MacRISC", 7) == 0) 146290557Sandreast iic_addr_8bit = 1; 147290557Sandreast } 148290557Sandreast } 149290557Sandreast 150290557Sandreast /* 151187261Snwhitehorn * Attach those children represented in the device tree. 152187261Snwhitehorn */ 153274641Sian for (child = OF_child(node); child != 0; child = OF_peer(child)) { 154189280Snwhitehorn /* 155189280Snwhitehorn * Try to get the I2C address first from the i2c-address 156194138Smarius * property, then try the reg property. It moves around 157189280Snwhitehorn * on different systems. 158189280Snwhitehorn */ 159256966Snwhitehorn if (OF_getencprop(child, "i2c-address", &paddr, 160256966Snwhitehorn sizeof(paddr)) == -1) 161256966Snwhitehorn if (OF_getencprop(child, "reg", &paddr, 162256966Snwhitehorn sizeof(paddr)) == -1) 163189280Snwhitehorn continue; 164189280Snwhitehorn 165187261Snwhitehorn /* 166187261Snwhitehorn * Now set up the I2C and OFW bus layer devinfo and add it 167187261Snwhitehorn * to the bus. 168187261Snwhitehorn */ 169187261Snwhitehorn dinfo = malloc(sizeof(struct ofw_iicbus_devinfo), M_DEVBUF, 170187261Snwhitehorn M_NOWAIT | M_ZERO); 171187261Snwhitehorn if (dinfo == NULL) 172187261Snwhitehorn continue; 173289704Sian /* 174290373Sandreast * FreeBSD drivers expect I2C addresses to be expressed as 175290373Sandreast * 8-bit values. Apple OFW data contains 8-bit values, but 176290373Sandreast * Linux FDT data contains 7-bit values, so shift them up to 177290373Sandreast * 8-bit format. 178289704Sian */ 179290557Sandreast if (iic_addr_8bit) 180290557Sandreast dinfo->opd_dinfo.addr = paddr; 181290557Sandreast else 182290557Sandreast dinfo->opd_dinfo.addr = paddr << 1; 183290557Sandreast 184187261Snwhitehorn if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) != 185187261Snwhitehorn 0) { 186187261Snwhitehorn free(dinfo, M_DEVBUF); 187187261Snwhitehorn continue; 188187261Snwhitehorn } 189282674Sloos 190187261Snwhitehorn childdev = device_add_child(dev, NULL, -1); 191282674Sloos resource_list_init(&dinfo->opd_dinfo.rl); 192282972Sbr ofw_bus_intr_to_rl(childdev, child, 193282972Sbr &dinfo->opd_dinfo.rl, NULL); 194187261Snwhitehorn device_set_ivars(childdev, dinfo); 195187261Snwhitehorn } 196187261Snwhitehorn 197292157Smmel /* Register bus */ 198292157Smmel OF_device_register_xref(OF_xref_from_node(node), dev); 199187261Snwhitehorn return (bus_generic_attach(dev)); 200187261Snwhitehorn} 201187261Snwhitehorn 202187261Snwhitehornstatic device_t 203212413Savgofw_iicbus_add_child(device_t dev, u_int order, const char *name, int unit) 204187261Snwhitehorn{ 205187261Snwhitehorn device_t child; 206187261Snwhitehorn struct ofw_iicbus_devinfo *devi; 207187261Snwhitehorn 208187261Snwhitehorn child = device_add_child_ordered(dev, order, name, unit); 209187261Snwhitehorn if (child == NULL) 210187261Snwhitehorn return (child); 211194138Smarius devi = malloc(sizeof(struct ofw_iicbus_devinfo), M_DEVBUF, 212187261Snwhitehorn M_NOWAIT | M_ZERO); 213187261Snwhitehorn if (devi == NULL) { 214187261Snwhitehorn device_delete_child(dev, child); 215187261Snwhitehorn return (0); 216187261Snwhitehorn } 217187261Snwhitehorn 218194138Smarius /* 219194138Smarius * NULL all the OFW-related parts of the ivars for non-OFW 220194138Smarius * children. 221194138Smarius */ 222187261Snwhitehorn devi->opd_obdinfo.obd_node = -1; 223187261Snwhitehorn devi->opd_obdinfo.obd_name = NULL; 224187261Snwhitehorn devi->opd_obdinfo.obd_compat = NULL; 225187261Snwhitehorn devi->opd_obdinfo.obd_type = NULL; 226187261Snwhitehorn devi->opd_obdinfo.obd_model = NULL; 227187261Snwhitehorn 228187261Snwhitehorn device_set_ivars(child, devi); 229194138Smarius 230187261Snwhitehorn return (child); 231187261Snwhitehorn} 232187261Snwhitehorn 233187261Snwhitehornstatic const struct ofw_bus_devinfo * 234187261Snwhitehornofw_iicbus_get_devinfo(device_t bus, device_t dev) 235187261Snwhitehorn{ 236187261Snwhitehorn struct ofw_iicbus_devinfo *dinfo; 237187261Snwhitehorn 238187261Snwhitehorn dinfo = device_get_ivars(dev); 239187261Snwhitehorn return (&dinfo->opd_obdinfo); 240187261Snwhitehorn} 241