pcf_isa.c revision 155233
1179200Sjb/*- 2179200Sjb * Copyright (c) 2004 Joerg Wunsch 3204597Suqs * 4204597Suqs * derived from sys/i386/isa/pcf.c which is: 5179200Sjb * 6179200Sjb * Copyright (c) 1998 Nicolas Souchu, Marc Bouget 7179200Sjb * All rights reserved. 8179200Sjb * 9179200Sjb * Redistribution and use in source and binary forms, with or without 10179200Sjb * modification, are permitted provided that the following conditions 11179200Sjb * are met: 12179200Sjb * 1. Redistributions of source code must retain the above copyright 13179200Sjb * notice, this list of conditions and the following disclaimer. 14179200Sjb * 2. Redistributions in binary form must reproduce the above copyright 15179200Sjb * notice, this list of conditions and the following disclaimer in the 16179200Sjb * documentation and/or other materials provided with the distribution. 17179200Sjb * 18179200Sjb * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19179200Sjb * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20179200Sjb * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21179200Sjb * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22179200Sjb * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23179200Sjb * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24179200Sjb * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25179200Sjb * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26179200Sjb * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27179200Sjb * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28179200Sjb * SUCH DAMAGE. 29179200Sjb */ 30179200Sjb#include <sys/cdefs.h> 31179200Sjb__FBSDID("$FreeBSD: head/sys/dev/pcf/pcf_isa.c 155233 2006-02-02 23:57:31Z imp $"); 32179200Sjb 33179200Sjb/* 34179200Sjb * Hardware driver for a Philips PCF8584 I2C bus controller sitting 35179200Sjb * on a generic ISA bus. 36179200Sjb */ 37283130Sbapt 38179200Sjb#include <sys/param.h> 39179200Sjb#include <sys/systm.h> 40#include <sys/bus.h> 41#include <sys/kernel.h> 42#include <sys/module.h> 43#include <sys/resource.h> 44 45#include <machine/bus.h> 46#include <machine/resource.h> 47 48#include <sys/rman.h> 49 50#include <isa/isareg.h> 51#include <isa/isavar.h> 52 53#include <dev/iicbus/iiconf.h> 54#include <dev/pcf/pcfvar.h> 55#include "iicbus_if.h" 56 57#define PCF_NAME "pcf" 58 59static void pcf_isa_identify(driver_t *, device_t); 60static int pcf_isa_probe(device_t); 61static int pcf_isa_attach(device_t); 62static int pcf_isa_detach(device_t); 63 64static device_method_t pcf_isa_methods[] = { 65 /* device interface */ 66 DEVMETHOD(device_identify, pcf_isa_identify), 67 DEVMETHOD(device_probe, pcf_isa_probe), 68 DEVMETHOD(device_attach, pcf_isa_attach), 69 DEVMETHOD(device_detach, pcf_isa_detach), 70 71 /* iicbus interface */ 72 DEVMETHOD(iicbus_callback, iicbus_null_callback), 73 DEVMETHOD(iicbus_repeated_start, pcf_repeated_start), 74 DEVMETHOD(iicbus_start, pcf_start), 75 DEVMETHOD(iicbus_stop, pcf_stop), 76 DEVMETHOD(iicbus_write, pcf_write), 77 DEVMETHOD(iicbus_read, pcf_read), 78 DEVMETHOD(iicbus_reset, pcf_rst_card), 79 { 0, 0 } 80}; 81 82static devclass_t pcf_isa_devclass; 83 84static driver_t pcf_isa_driver = { 85 PCF_NAME, 86 pcf_isa_methods, 87 sizeof(struct pcf_softc), 88}; 89 90static void 91pcf_isa_identify(driver_t *driver, device_t parent) 92{ 93 BUS_ADD_CHILD(parent, ISA_ORDER_SPECULATIVE, PCF_NAME, 0); 94 95 return; 96} 97 98static int 99pcf_isa_probe(device_t dev) 100{ 101 u_long start, count; 102 u_int rid = 0, port, error; 103 104 /* skip PnP probes */ 105 if (isa_get_logicalid(dev)) 106 return (ENXIO); 107 108 /* The port address must be explicitly specified */ 109 bus_get_resource(dev, SYS_RES_IOPORT, rid, &start, &count); 110 if ((error = resource_int_value(PCF_NAME, 0, "port", &port) != 0)) 111 return (error); 112 113 /* Probe is only successfull for the specified base io */ 114 if (port != (u_int)start) 115 return (ENXIO); 116 117 device_set_desc(dev, "PCF8584 I2C bus controller"); 118 119 return (0); 120} 121 122static int 123pcf_isa_attach(device_t dev) 124{ 125 struct pcf_softc *sc; 126 int rv = ENXIO; 127 128 sc = DEVTOSOFTC(dev); 129 bzero(sc, sizeof(struct pcf_softc)); 130 131 /* IO port is mandatory */ 132 sc->res_ioport = bus_alloc_resource_any(dev, SYS_RES_IOPORT, 133 &sc->rid_ioport, RF_ACTIVE); 134 if (sc->res_ioport == 0) { 135 device_printf(dev, "cannot reserve I/O port range\n"); 136 goto error; 137 } 138 sc->bt_ioport = rman_get_bustag(sc->res_ioport); 139 sc->bh_ioport = rman_get_bushandle(sc->res_ioport); 140 141 sc->pcf_flags = device_get_flags(dev); 142 143 if (!(sc->pcf_flags & IIC_POLLED)) { 144 sc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->rid_irq, 145 RF_ACTIVE); 146 if (sc->res_irq == 0) { 147 device_printf(dev, "can't reserve irq, polled mode.\n"); 148 sc->pcf_flags |= IIC_POLLED; 149 } 150 } 151 152 /* reset the chip */ 153 pcf_rst_card(dev, IIC_FASTEST, PCF_DEFAULT_ADDR, NULL); 154 155 if (sc->res_irq) { 156 rv = BUS_SETUP_INTR(device_get_parent(dev), dev, sc->res_irq, 157 INTR_TYPE_NET /* | INTR_ENTROPY */, 158 pcf_intr, sc, &sc->intr_cookie); 159 if (rv) { 160 device_printf(dev, "could not setup IRQ\n"); 161 goto error; 162 } 163 } 164 165 if ((sc->iicbus = device_add_child(dev, "iicbus", -1)) == NULL) 166 device_printf(dev, "could not allocate iicbus instance\n"); 167 168 /* probe and attach the iicbus */ 169 bus_generic_attach(dev); 170 171 return (0); 172 173error: 174 if (sc->res_irq != 0) { 175 bus_deactivate_resource(dev, SYS_RES_IRQ, sc->rid_irq, 176 sc->res_irq); 177 bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq, 178 sc->res_irq); 179 } 180 if (sc->res_ioport != 0) { 181 bus_deactivate_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, 182 sc->res_ioport); 183 bus_release_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, 184 sc->res_ioport); 185 } 186 return (rv); 187} 188 189static int 190pcf_isa_detach(device_t dev) 191{ 192 struct pcf_softc *sc; 193 int rv; 194 195 sc = DEVTOSOFTC(dev); 196 197 if ((rv = bus_generic_detach(dev)) != 0) 198 return (rv); 199 200 if ((rv = device_delete_child(dev, sc->iicbus)) != 0) 201 return (rv); 202 203 if (sc->res_irq != 0) { 204 BUS_TEARDOWN_INTR(device_get_parent(dev), dev, sc->res_irq, 205 sc->intr_cookie); 206 bus_deactivate_resource(dev, SYS_RES_IRQ, sc->rid_irq, sc->res_irq); 207 bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq, sc->res_irq); 208 } 209 210 bus_deactivate_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, sc->res_ioport); 211 bus_release_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, sc->res_ioport); 212 213 return (0); 214} 215 216DRIVER_MODULE(pcf_isa, isa, pcf_isa_driver, pcf_isa_devclass, 0, 0); 217MODULE_DEPEND(pcf_isa, iicbus, PCF_MINVER, PCF_PREFVER, PCF_MAXVER); 218MODULE_VERSION(pcf_isa, PCF_MODVER); 219