1 /*- 2 * Copyright (c) 2004 Joerg Wunsch 3 * 4 * derived from sys/i386/isa/pcf.c which is: 5 * 6 * Copyright (c) 1998 Nicolas Souchu, Marc Bouget 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 /* 34 * Hardware driver for a Philips PCF8584 I2C bus controller sitting 35 * on a generic ISA bus. 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/bus.h> 41 #include <sys/kernel.h> 42 #include <sys/resource.h> 43 44 #include <machine/bus.h> 45 #include <machine/resource.h> 46 47 #include <sys/rman.h> 48 49 #include <isa/isareg.h> 50 #include <isa/isavar.h> 51 52 #include <dev/iicbus/iiconf.h> 53 #include <dev/pcf/pcfvar.h> 54 #include "iicbus_if.h" 55 56 static int pcf_probe(device_t); 57 static int pcf_attach(device_t); 58 static int pcf_detach(device_t); 59 60 static device_method_t pcf_methods[] = { 61 /* device interface */ 62 DEVMETHOD(device_probe, pcf_probe), 63 DEVMETHOD(device_attach, pcf_attach), 64 DEVMETHOD(device_detach, pcf_detach), 65 66 /* iicbus interface */ 67 DEVMETHOD(iicbus_callback, iicbus_null_callback), 68 DEVMETHOD(iicbus_repeated_start, pcf_repeated_start), 69 DEVMETHOD(iicbus_start, pcf_start), 70 DEVMETHOD(iicbus_stop, pcf_stop), 71 DEVMETHOD(iicbus_write, pcf_write), 72 DEVMETHOD(iicbus_read, pcf_read), 73 DEVMETHOD(iicbus_reset, pcf_rst_card), 74 { 0, 0 } 75 }; 76 77 static devclass_t pcf_devclass; 78 79 static driver_t pcf_driver = { 80 "pcf", 81 pcf_methods, 82 sizeof(struct pcf_softc), 83 }; 84 85 static int 86 pcf_probe(device_t dev) 87 { 88 89 device_set_desc(dev, "PCF8584 I2C bus controller"); 90 return (0); 91 } 92 93 static int 94 pcf_attach(device_t dev) 95 { 96 struct pcf_softc *sc; 97 int rv = ENXIO; 98 99 sc = DEVTOSOFTC(dev); 100 bzero(sc, sizeof(struct pcf_softc)); 101 102 /* IO port is mandatory */ 103 sc->res_ioport = bus_alloc_resource_any(dev, SYS_RES_IOPORT, 104 &sc->rid_ioport, RF_ACTIVE); 105 if (sc->res_ioport == 0) { 106 device_printf(dev, "cannot reserve I/O port range\n"); 107 goto error; 108 } 109 110 sc->pcf_flags = device_get_flags(dev); 111 112 if (!(sc->pcf_flags & IIC_POLLED)) { 113 sc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->rid_irq, 114 RF_ACTIVE); 115 if (sc->res_irq == 0) { 116 device_printf(dev, "can't reserve irq, polled mode.\n"); 117 sc->pcf_flags |= IIC_POLLED; 118 } 119 } 120 121 /* reset the chip */ 122 pcf_rst_card(dev, IIC_FASTEST, PCF_DEFAULT_ADDR, NULL); 123 124 rv = BUS_SETUP_INTR(device_get_parent(dev), dev, sc->res_irq, 125 INTR_TYPE_NET /* | INTR_ENTROPY */, 126 pcf_intr, sc, &sc->intr_cookie); 127 if (rv) { 128 device_printf(dev, "could not setup IRQ\n"); 129 goto error; 130 } 131 132 if ((sc->iicbus = device_add_child(dev, "iicbus", -1)) == NULL) 133 device_printf(dev, "could not allocate iicbus instance\n"); 134 135 /* probe and attach the iicbus */ 136 bus_generic_attach(dev); 137 138 return (0); 139 140 error: 141 if (sc->res_irq != 0) { 142 bus_deactivate_resource(dev, SYS_RES_IRQ, sc->rid_irq, 143 sc->res_irq); 144 bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq, 145 sc->res_irq); 146 } 147 if (sc->res_ioport != 0) { 148 bus_deactivate_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, 149 sc->res_ioport); 150 bus_release_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, 151 sc->res_ioport); 152 } 153 return (rv); 154 } 155 156 static int 157 pcf_detach(device_t dev) 158 { 159 struct pcf_softc *sc; 160 int rv; 161 162 sc = DEVTOSOFTC(dev); 163 164 if ((rv = bus_generic_detach(dev)) != 0) 165 return (rv); 166 167 if ((rv = device_delete_child(dev, sc->iicbus)) != 0) 168 return (rv); 169 170 if (sc->res_irq != 0) { 171 BUS_TEARDOWN_INTR(device_get_parent(dev), dev, sc->res_irq, 172 sc->intr_cookie); 173 bus_deactivate_resource(dev, SYS_RES_IRQ, sc->rid_irq, sc->res_irq); 174 bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq, sc->res_irq); 175 } 176 177 bus_deactivate_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, sc->res_ioport); 178 bus_release_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, sc->res_ioport); 179 180 return (0); 181 } 182 183 DRIVER_MODULE(pcf, ebus, pcf_driver, pcf_devclass, 0, 0); 184 MODULE_DEPEND(pcf, iicbus, PCF_MINVER, PCF_PREFVER, PCF_MAXVER); 185 MODULE_VERSION(pcf, PCF_MODVER); 186