122 lines
3.9 KiB
C
122 lines
3.9 KiB
C
/* $NetBSD: i80312_i2c.c,v 1.4 2007/12/06 17:00:32 ad Exp $ */
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/*
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* Copyright (c) 2003 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Jason R. Thorpe for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Intel i80321 I/O Processor I2C Controller Unit support.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: i80312_i2c.c,v 1.4 2007/12/06 17:00:32 ad Exp $");
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#include <sys/param.h>
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#include <sys/mutex.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/kernel.h>
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#include <machine/bus.h>
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#include <machine/intr.h>
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#include <arm/xscale/i80312var.h>
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#include <dev/i2c/i2cvar.h>
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#include <arm/xscale/iopi2cvar.h>
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#include <arm/xscale/iopi2creg.h>
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static int
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iic312_match(struct device *parent, struct cfdata *cf, void *aux)
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{
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struct iopxs_attach_args *ia = aux;
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if (strcmp(cf->cf_name, ia->ia_name) == 0)
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return (1);
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return (0);
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}
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static void
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iic312_attach(struct device *parent, struct device *self, void *aux)
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{
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struct iopiic_softc *sc = (void *) self;
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struct iopxs_attach_args *ia = aux;
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int error;
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aprint_naive(": I2C controller\n");
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aprint_normal(": I2C controller\n");
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sc->sc_st = ia->ia_st;
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if ((error = bus_space_subregion(sc->sc_st, ia->ia_sh,
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ia->ia_offset, ia->ia_size,
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&sc->sc_sh)) != 0) {
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aprint_error("%s: unable to subregion registers, error = %d\n",
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sc->sc_dev.dv_xname, error);
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return;
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}
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/* XXX Reset the I2C unit? */
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mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE);
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/* XXX We don't currently use interrupts. Fix this some day. */
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#if 0
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sc->sc_ih = i80321_intr_establish(ICU_INT_I2C, IPL_BIO,
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iopiic_intr, sc);
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if (sc->sc_ih == NULL) {
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aprint_error("%s: unable to establish interrupt handler\n",
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sc->sc_dev.dv_xname);
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return;
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}
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#endif
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/*
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* Enable the I2C unit as a master running at 100.0 kHz (ICCR=0x1f4
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* per p.12-8 of the i80312 developer's manual).
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* No, we do not support slave mode.
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*/
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sc->sc_icr = IIC_ICR_GCD | IIC_ICR_UE | IIC_ICR_SCLE;
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bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, 0);
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bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICCR, 0x1f4);
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bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ISAR, 0);
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bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, sc->sc_icr);
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iopiic_attach(sc);
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}
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CFATTACH_DECL(iopiic, sizeof(struct iopiic_softc),
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iic312_match, iic312_attach, NULL, NULL);
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