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/* $OpenBSD: i80321_i2c.c,v 1.3 2009/03/27 16:02:41 oga Exp $ */
/* $NetBSD: i80321_i2c.c,v 1.2 2005/12/11 12:16:51 christos Exp $ */
/*
* Copyright (c) 2003 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Intel i80321 I/O Processor I2C Controller Unit support.
*/
#include <sys/param.h>
#include <sys/rwlock.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <arm/xscale/i80321reg.h>
#include <arm/xscale/i80321var.h>
#include <dev/i2c/i2cvar.h>
#include <arm/xscale/iopi2creg.h>
#include <arm/xscale/iopi2cvar.h>
int i80321_i2c_match(struct device *parent, void *v, void *aux);
void i80321_i2c_attach(struct device *parent, struct device *self, void *aux);
struct cfattach i80321_i2c_ca = {
sizeof(struct iopiic_softc), i80321_i2c_match, i80321_i2c_attach
};
int
i80321_i2c_match(struct device *parent, void *v, void *aux)
{
struct cfdata *cf = v;
struct iopxs_attach_args *ia = aux;
/* XXX thecus will reboot if iopiic1 attaches */
if (ia->ia_offset == VERDE_I2C_BASE1)
return 0;
if (strcmp(cf->cf_driver->cd_name, ia->ia_name) == 0)
return (1);
return (0);
}
void
i80321_i2c_attach(struct device *parent, struct device *self, void *aux)
{
struct iopiic_softc *sc = (void *) self;
struct iopxs_attach_args *ia = aux;
int error;
#ifdef LATER
uint8_t gpio_bits;
#endif
printf(": I2C controller\n");
sc->sc_st = ia->ia_st;
if ((error = bus_space_subregion(sc->sc_st, ia->ia_sh,
ia->ia_offset, ia->ia_size,
&sc->sc_sh)) != 0) {
printf("%s: unable to subregion registers, error = %d\n",
sc->sc_dev.dv_xname, error);
return;
}
#ifdef LATER
gpio_bits = (ia->ia_offset == VERDE_I2C_BASE0) ?
(1U << 7) | (1U << 6) : (1U << 5) | (1U << 4);
i80321_gpio_set_val(gpio_bits, 0);
i80321_gpio_set_direction(gpio_bits, 0);
#endif
/* XXX Reset the I2C unit? */
rw_init(&sc->sc_buslock, "iopiiclk");
/* XXX We don't currently use interrupts. Fix this some day. */
#if 0
sc->sc_ih = i80321_intr_establish((ia->ia_offset == VERDE_I2C_BASE0) ?
ICU_INT_I2C0 : ICU_INT_I2C1, IPL_BIO, iopiic_intr, sc);
if (sc->sc_ih == NULL) {
aprint_error("%s: unable to establish interrupt handler\n",
sc->sc_dev.dv_xname);
return;
}
#endif
/*
* Enable the I2C unit as a master.
* No, we do not support slave mode.
*/
sc->sc_icr = IIC_ICR_GCD | IIC_ICR_UE | IIC_ICR_SCLE;
bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, 0);
bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ISAR, 0);
bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, sc->sc_icr);
iopiic_attach(sc);
}
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