pcf_isa.c revision 181332
1151937Sjkim/*- 2151937Sjkim * Copyright (c) 2004 Joerg Wunsch 3151937Sjkim * 4151937Sjkim * derived from sys/i386/isa/pcf.c which is: 5151937Sjkim * 6151937Sjkim * Copyright (c) 1998 Nicolas Souchu, Marc Bouget 7217365Sjkim * All rights reserved. 8298714Sjkim * 9151937Sjkim * Redistribution and use in source and binary forms, with or without 10151937Sjkim * modification, are permitted provided that the following conditions 11217365Sjkim * are met: 12217365Sjkim * 1. Redistributions of source code must retain the above copyright 13217365Sjkim * notice, this list of conditions and the following disclaimer. 14217365Sjkim * 2. Redistributions in binary form must reproduce the above copyright 15217365Sjkim * notice, this list of conditions and the following disclaimer in the 16217365Sjkim * documentation and/or other materials provided with the distribution. 17217365Sjkim * 18217365Sjkim * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19217365Sjkim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20217365Sjkim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21217365Sjkim * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22217365Sjkim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23217365Sjkim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24217365Sjkim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25151937Sjkim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26217365Sjkim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27217365Sjkim * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28217365Sjkim * SUCH DAMAGE. 29151937Sjkim */ 30217365Sjkim#include <sys/cdefs.h> 31217365Sjkim__FBSDID("$FreeBSD: head/sys/dev/pcf/pcf_isa.c 181332 2008-08-05 17:39:37Z jhb $"); 32217365Sjkim 33217365Sjkim/* 34217365Sjkim * Hardware driver for a Philips PCF8584 I2C bus controller sitting 35217365Sjkim * on a generic ISA bus. 36217365Sjkim */ 37217365Sjkim 38217365Sjkim#include <sys/param.h> 39217365Sjkim#include <sys/bus.h> 40217365Sjkim#include <sys/lock.h> 41217365Sjkim#include <sys/kernel.h> 42217365Sjkim#include <sys/module.h> 43151937Sjkim#include <sys/mutex.h> 44151937Sjkim#include <sys/resource.h> 45151937Sjkim#include <sys/systm.h> 46151937Sjkim 47151937Sjkim#include <machine/bus.h> 48151937Sjkim#include <machine/resource.h> 49151937Sjkim 50151937Sjkim#include <sys/rman.h> 51151937Sjkim 52151937Sjkim#include <isa/isareg.h> 53151937Sjkim#include <isa/isavar.h> 54151937Sjkim 55151937Sjkim#include <dev/iicbus/iiconf.h> 56151937Sjkim#include <dev/pcf/pcfvar.h> 57241973Sjkim#include "iicbus_if.h" 58151937Sjkim 59151937Sjkim#define PCF_NAME "pcf" 60151937Sjkim 61151937Sjkimstatic void pcf_isa_identify(driver_t *, device_t); 62151937Sjkimstatic int pcf_isa_probe(device_t); 63151937Sjkimstatic int pcf_isa_attach(device_t); 64151937Sjkimstatic int pcf_isa_detach(device_t); 65151937Sjkim 66151937Sjkimstatic device_method_t pcf_isa_methods[] = { 67241973Sjkim /* device interface */ 68151937Sjkim DEVMETHOD(device_identify, pcf_isa_identify), 69151937Sjkim DEVMETHOD(device_probe, pcf_isa_probe), 70151937Sjkim DEVMETHOD(device_attach, pcf_isa_attach), 71151937Sjkim DEVMETHOD(device_detach, pcf_isa_detach), 72151937Sjkim 73151937Sjkim /* iicbus interface */ 74151937Sjkim DEVMETHOD(iicbus_callback, iicbus_null_callback), 75151937Sjkim DEVMETHOD(iicbus_repeated_start, pcf_repeated_start), 76151937Sjkim DEVMETHOD(iicbus_start, pcf_start), 77151937Sjkim DEVMETHOD(iicbus_stop, pcf_stop), 78151937Sjkim DEVMETHOD(iicbus_write, pcf_write), 79151937Sjkim DEVMETHOD(iicbus_read, pcf_read), 80151937Sjkim DEVMETHOD(iicbus_reset, pcf_rst_card), 81151937Sjkim { 0, 0 } 82151937Sjkim}; 83151937Sjkim 84151937Sjkimstatic devclass_t pcf_isa_devclass; 85151937Sjkim 86151937Sjkimstatic driver_t pcf_isa_driver = { 87151937Sjkim PCF_NAME, 88151937Sjkim pcf_isa_methods, 89151937Sjkim sizeof(struct pcf_softc), 90151937Sjkim}; 91151937Sjkim 92151937Sjkimstatic void 93151937Sjkimpcf_isa_identify(driver_t *driver, device_t parent) 94151937Sjkim{ 95151937Sjkim BUS_ADD_CHILD(parent, ISA_ORDER_SPECULATIVE, PCF_NAME, 0); 96298714Sjkim 97228110Sjkim return; 98151937Sjkim} 99167802Sjkim 100151937Sjkimstatic int 101151937Sjkimpcf_isa_probe(device_t dev) 102151937Sjkim{ 103151937Sjkim u_long start, count; 104151937Sjkim u_int rid = 0, port, error; 105151937Sjkim 106151937Sjkim /* skip PnP probes */ 107151937Sjkim if (isa_get_logicalid(dev)) 108151937Sjkim return (ENXIO); 109151937Sjkim 110151937Sjkim /* The port address must be explicitly specified */ 111151937Sjkim bus_get_resource(dev, SYS_RES_IOPORT, rid, &start, &count); 112151937Sjkim if ((error = resource_int_value(PCF_NAME, 0, "port", &port) != 0)) 113151937Sjkim return (error); 114151937Sjkim 115281396Sjkim /* Probe is only successfull for the specified base io */ 116151937Sjkim if (port != (u_int)start) 117151937Sjkim return (ENXIO); 118151937Sjkim 119151937Sjkim device_set_desc(dev, "PCF8584 I2C bus controller"); 120151937Sjkim 121151937Sjkim return (0); 122151937Sjkim} 123151937Sjkim 124151937Sjkimstatic int 125151937Sjkimpcf_isa_attach(device_t dev) 126151937Sjkim{ 127151937Sjkim struct pcf_softc *sc; 128151937Sjkim int rv = ENXIO; 129151937Sjkim 130151937Sjkim sc = DEVTOSOFTC(dev); 131151937Sjkim mtx_init(&sc->pcf_lock, device_get_nameunit(dev), "pcf", MTX_DEF); 132151937Sjkim 133151937Sjkim /* IO port is mandatory */ 134151937Sjkim sc->res_ioport = bus_alloc_resource_any(dev, SYS_RES_IOPORT, 135151937Sjkim &sc->rid_ioport, RF_ACTIVE); 136151937Sjkim if (sc->res_ioport == 0) { 137151937Sjkim device_printf(dev, "cannot reserve I/O port range\n"); 138151937Sjkim goto error; 139151937Sjkim } 140151937Sjkim 141151937Sjkim sc->pcf_flags = device_get_flags(dev); 142151937Sjkim 143151937Sjkim if (!(sc->pcf_flags & IIC_POLLED)) { 144151937Sjkim sc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->rid_irq, 145151937Sjkim RF_ACTIVE); 146151937Sjkim if (sc->res_irq == 0) { 147151937Sjkim device_printf(dev, "can't reserve irq, polled mode.\n"); 148151937Sjkim sc->pcf_flags |= IIC_POLLED; 149151937Sjkim } 150151937Sjkim } 151151937Sjkim 152151937Sjkim /* reset the chip */ 153151937Sjkim pcf_rst_card(dev, IIC_FASTEST, PCF_DEFAULT_ADDR, NULL); 154151937Sjkim 155151937Sjkim if (sc->res_irq) { 156298714Sjkim rv = bus_setup_intr(dev, sc->res_irq, 157151937Sjkim INTR_TYPE_NET /* | INTR_ENTROPY */, 158151937Sjkim NULL, pcf_intr, sc, &sc->intr_cookie); 159151937Sjkim if (rv) { 160151937Sjkim device_printf(dev, "could not setup IRQ\n"); 161151937Sjkim goto error; 162151937Sjkim } 163298714Sjkim } 164151937Sjkim 165151937Sjkim if ((sc->iicbus = device_add_child(dev, "iicbus", -1)) == NULL) 166151937Sjkim device_printf(dev, "could not allocate iicbus instance\n"); 167151937Sjkim 168151937Sjkim /* probe and attach the iicbus */ 169151937Sjkim bus_generic_attach(dev); 170151937Sjkim 171228110Sjkim return (0); 172151937Sjkim 173151937Sjkimerror: 174151937Sjkim if (sc->res_irq != 0) { 175151937Sjkim bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq, 176151937Sjkim sc->res_irq); 177151937Sjkim } 178151937Sjkim if (sc->res_ioport != 0) { 179151937Sjkim bus_release_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, 180151937Sjkim sc->res_ioport); 181151937Sjkim } 182151937Sjkim mtx_destroy(&sc->pcf_lock); 183151937Sjkim return (rv); 184151937Sjkim} 185151937Sjkim 186151937Sjkimstatic int 187151937Sjkimpcf_isa_detach(device_t dev) 188151937Sjkim{ 189151937Sjkim struct pcf_softc *sc; 190151937Sjkim int rv; 191151937Sjkim 192151937Sjkim sc = DEVTOSOFTC(dev); 193151937Sjkim 194151937Sjkim if ((rv = bus_generic_detach(dev)) != 0) 195151937Sjkim return (rv); 196151937Sjkim 197151937Sjkim if ((rv = device_delete_child(dev, sc->iicbus)) != 0) 198151937Sjkim return (rv); 199241973Sjkim 200151937Sjkim if (sc->res_irq != 0) { 201151937Sjkim bus_teardown_intr(dev, sc->res_irq, sc->intr_cookie); 202151937Sjkim bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq, sc->res_irq); 203151937Sjkim } 204151937Sjkim 205151937Sjkim bus_release_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, sc->res_ioport); 206151937Sjkim mtx_destroy(&sc->pcf_lock); 207151937Sjkim 208151937Sjkim return (0); 209151937Sjkim} 210151937Sjkim 211151937SjkimDRIVER_MODULE(pcf_isa, isa, pcf_isa_driver, pcf_isa_devclass, 0, 0); 212151937Sjkim