127 lines
4.0 KiB
C
127 lines
4.0 KiB
C
/* $NetBSD: i80321_i2c.c,v 1.3 2007/12/06 17:00:32 ad 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/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: i80321_i2c.c,v 1.3 2007/12/06 17:00:32 ad Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/mutex.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>
|
|
|
|
static int
|
|
iic321_match(struct device *parent, struct cfdata *cf, void *aux)
|
|
{
|
|
struct iopxs_attach_args *ia = aux;
|
|
|
|
if (strcmp(cf->cf_name, ia->ia_name) == 0)
|
|
return (1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
iic321_attach(struct device *parent, struct device *self, void *aux)
|
|
{
|
|
struct iopiic_softc *sc = (void *) self;
|
|
struct iopxs_attach_args *ia = aux;
|
|
int error;
|
|
uint8_t gpio_bits;
|
|
|
|
aprint_naive(": I2C controller\n");
|
|
aprint_normal(": 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) {
|
|
aprint_error("%s: unable to subregion registers, error = %d\n",
|
|
sc->sc_dev.dv_xname, error);
|
|
return;
|
|
}
|
|
|
|
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);
|
|
|
|
/* XXX Reset the I2C unit? */
|
|
|
|
mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE);
|
|
|
|
/* 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);
|
|
}
|
|
|
|
CFATTACH_DECL(iopiic, sizeof(struct iopiic_softc),
|
|
iic321_match, iic321_attach, NULL, NULL);
|