/* $NetBSD: gpiic_opb.c,v 1.9 2011/06/18 06:41:42 matt Exp $ */
/*
* Copyright 2002, 2003 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Steve C. Woodford 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.
*/
#include "locators.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/mutex.h>
#include <sys/cpu.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/i2c_bitbang.h>
#include <powerpc/ibm4xx/cpu.h>
#include <powerpc/ibm4xx/dev/opbvar.h>
#include <powerpc/ibm4xx/dev/gpiicreg.h>
struct gpiic_softc {
device_t sc_dev;
bus_space_tag_t sc_bust;
bus_space_handle_t sc_bush;
uint8_t sc_txen;
uint8_t sc_tx;
struct i2c_controller sc_i2c;
struct i2c_bitbang_ops sc_bops;
kmutex_t sc_buslock;
};
static int gpiic_match(device_t, cfdata_t, void *);
static void gpiic_attach(device_t, device_t, void *);
CFATTACH_DECL_NEW(gpiic, sizeof(struct gpiic_softc),
gpiic_match, gpiic_attach, NULL, NULL);
static int gpiic_acquire_bus(void *, int);
static void gpiic_release_bus(void *, int);
static int gpiic_send_start(void *, int);
static int gpiic_send_stop(void *, int);
static int gpiic_initiate_xfer(void *, i2c_addr_t, int);
static int gpiic_read_byte(void *, uint8_t *, int);
static int gpiic_write_byte(void *, uint8_t, int);
static void gpiic_set_dir(void *, uint32_t);
static void gpiic_set_bits(void *, uint32_t);
static uint32_t gpiic_read_bits(void *);
static int
gpiic_match(device_t parent, cfdata_t cf, void *args)
{
struct opb_attach_args * const oaa = args;
if (strcmp(oaa->opb_name, cf->cf_name) != 0)
return 0;
return (1);
}
static void
gpiic_attach(device_t parent, device_t self, void *args)
{
struct gpiic_softc * const sc = device_private(self);
struct opb_attach_args * const oaa = args;
struct i2cbus_attach_args iba;
aprint_naive(": IIC controller\n");
aprint_normal(": On-Chip IIC controller\n");
sc->sc_dev = self;
sc->sc_bust = oaa->opb_bt;
bus_space_map(sc->sc_bust, oaa->opb_addr, IIC_NREG, 0, &sc->sc_bush);
mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE);
sc->sc_txen = 0;
sc->sc_tx = IIC_DIRECTCNTL_SCC | IIC_DIRECTCNTL_SDAC;
sc->sc_i2c.ic_cookie = sc;
sc->sc_i2c.ic_acquire_bus = gpiic_acquire_bus;
sc->sc_i2c.ic_release_bus = gpiic_release_bus;
sc->sc_i2c.ic_exec = NULL;
sc->sc_i2c.ic_send_start = gpiic_send_start;
sc->sc_i2c.ic_send_stop = gpiic_send_stop;
sc->sc_i2c.ic_initiate_xfer = gpiic_initiate_xfer;
sc->sc_i2c.ic_read_byte = gpiic_read_byte;
sc->sc_i2c.ic_write_byte = gpiic_write_byte;
sc->sc_bops.ibo_set_dir = gpiic_set_dir;
sc->sc_bops.ibo_set_bits = gpiic_set_bits;
sc->sc_bops.ibo_read_bits = gpiic_read_bits;
sc->sc_bops.ibo_bits[I2C_BIT_SDA] = IIC_DIRECTCNTL_SDAC;
sc->sc_bops.ibo_bits[I2C_BIT_SCL] = IIC_DIRECTCNTL_SCC;
sc->sc_bops.ibo_bits[I2C_BIT_OUTPUT] = 1;
sc->sc_bops.ibo_bits[I2C_BIT_INPUT] = 0;
/*
* Put the controller into Soft Reset. This allows us to
* manually bit-bang the I2C clock/data lines.
*/
bus_space_write_1(sc->sc_bust, sc->sc_bush, IIC_XTCNTLSS,
IIC_XTCNTLSS_SRST);
delay(10);
bus_space_write_1(sc->sc_bust, sc->sc_bush, IIC_DIRECTCNTL,
IIC_DIRECTCNTL_SCC | IIC_DIRECTCNTL_SDAC);
memset(&iba, 0, sizeof(iba));
iba.iba_tag = &sc->sc_i2c;
(void) config_found_ia(self, "i2cbus", &iba, iicbus_print);
}
static int
gpiic_acquire_bus(void *arg, int flags)
{
struct gpiic_softc * const sc = arg;
if (flags & I2C_F_POLL)
return (0);
mutex_enter(&sc->sc_buslock);
return (0);
}
static void
gpiic_release_bus(void *arg, int flags)
{
struct gpiic_softc * const sc = arg;
if (flags & I2C_F_POLL)
return;
mutex_exit(&sc->sc_buslock);
}
static int
gpiic_send_start(void *arg, int flags)
{
struct gpiic_softc * const sc = arg;
return (i2c_bitbang_send_start(sc, flags, &sc->sc_bops));
}
static int
gpiic_send_stop(void *arg, int flags)
{
struct gpiic_softc * const sc = arg;
return (i2c_bitbang_send_stop(sc, flags, &sc->sc_bops));
}
static int
gpiic_initiate_xfer(void *arg, i2c_addr_t addr, int flags)
{
struct gpiic_softc * const sc = arg;
return (i2c_bitbang_initiate_xfer(sc, addr, flags, &sc->sc_bops));
}
static int
gpiic_read_byte(void *arg, uint8_t *vp, int flags)
{
struct gpiic_softc * const sc = arg;
return (i2c_bitbang_read_byte(sc, vp, flags, &sc->sc_bops));
}
static int
gpiic_write_byte(void *arg, uint8_t v, int flags)
{
struct gpiic_softc * const sc = arg;
return (i2c_bitbang_write_byte(sc, v, flags, &sc->sc_bops));
}
static void
gpiic_set_dir(void *arg, uint32_t bits)
{
struct gpiic_softc * const sc = arg;
uint8_t tx, txen;
txen = (uint8_t)bits;
if (sc->sc_txen == txen)
return;
sc->sc_txen = txen;
tx = sc->sc_tx;
if (sc->sc_txen == 0)
tx |= IIC_DIRECTCNTL_SDAC;
bus_space_write_1(sc->sc_bust, sc->sc_bush, IIC_DIRECTCNTL, tx);
}
static void
gpiic_set_bits(void *arg, uint32_t bits)
{
struct gpiic_softc * const sc = arg;
sc->sc_tx = (uint8_t)bits;
if (sc->sc_txen == 0)
bits |= IIC_DIRECTCNTL_SDAC;
bus_space_write_1(sc->sc_bust, sc->sc_bush, IIC_DIRECTCNTL, bits);
}
static uint32_t
gpiic_read_bits(void *arg)
{
struct gpiic_softc * const sc = arg;
uint8_t rv;
rv = bus_space_read_1(sc->sc_bust, sc->sc_bush, IIC_DIRECTCNTL) << 2;
rv &= (IIC_DIRECTCNTL_SCC | IIC_DIRECTCNTL_SDAC);
return ((uint32_t)rv);
}