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/* $OpenBSD: tsciic.c,v 1.1 2014/12/24 18:46:14 miod Exp $ */
/* $NetBSD: tsciic.c,v 1.1 2014/02/21 12:23:30 jdc Exp $ */
/*
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Julian Coleman.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 THE FOUNDATION OR CONTRIBUTORS
* 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/rwlock.h>
#include <alpha/pci/tsreg.h>
#include <alpha/pci/tsvar.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/i2c_bitbang.h>
struct tsciic_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct i2c_controller sc_i2c_tag;
struct rwlock sc_i2c_lock;
};
int tsciic_match(struct device *, void *, void *);
void tsciic_attach(struct device *, struct device *, void *);
const struct cfattach tsciic_ca = {
.ca_devsize = sizeof(struct tsciic_softc),
.ca_match = tsciic_match,
.ca_attach = tsciic_attach
};
struct cfdriver tsciic_cd = {
.cd_name = "tsciic",
.cd_class = DV_DULL
};
/* I2C glue */
int tsciic_acquire_bus(void *, int);
void tsciic_release_bus(void *, int);
int tsciic_send_start(void *, int);
int tsciic_send_stop(void *, int);
int tsciic_initiate_xfer(void *, i2c_addr_t, int);
int tsciic_read_byte(void *, uint8_t *, int);
int tsciic_write_byte(void *, uint8_t, int);
/* I2C bitbang glue */
void tsciicbb_set_bits(void *, uint32_t);
void tsciicbb_set_dir(void *, uint32_t);
uint32_t tsciicbb_read(void *);
#define MPD_BIT_SDA 0x01
#define MPD_BIT_SCL 0x02
static const struct i2c_bitbang_ops tsciicbb_ops = {
.ibo_set_bits = tsciicbb_set_bits,
.ibo_set_dir = tsciicbb_set_dir,
.ibo_read_bits = tsciicbb_read,
.ibo_bits = {
[I2C_BIT_SDA] MPD_BIT_SDA,
[I2C_BIT_SCL] MPD_BIT_SCL
}
};
int
tsciic_match(struct device *parent, void *match, void *aux)
{
struct tsp_attach_args *tsp = (struct tsp_attach_args *)aux;
return strcmp(tsp->tsp_name, tsciic_cd.cd_name) == 0;
}
void
tsciic_attach(struct device *parent, struct device *self, void *aux)
{
struct tsciic_softc *sc = (struct tsciic_softc *)self;
struct i2cbus_attach_args iba;
printf("\n");
rw_init(&sc->sc_i2c_lock, "tsciiclk");
sc->sc_i2c_tag.ic_cookie = sc;
sc->sc_i2c_tag.ic_acquire_bus = tsciic_acquire_bus;
sc->sc_i2c_tag.ic_release_bus = tsciic_release_bus;
sc->sc_i2c_tag.ic_send_start = tsciic_send_start;
sc->sc_i2c_tag.ic_send_stop = tsciic_send_stop;
sc->sc_i2c_tag.ic_initiate_xfer = tsciic_initiate_xfer;
sc->sc_i2c_tag.ic_read_byte = tsciic_read_byte;
sc->sc_i2c_tag.ic_write_byte = tsciic_write_byte;
memset(&iba, 0, sizeof iba);
iba.iba_name = "iic";
iba.iba_tag = &sc->sc_i2c_tag;
config_found(self, &iba, iicbus_print);
}
int
tsciic_acquire_bus(void *cookie, int flags)
{
struct tsciic_softc *sc = cookie;
if (cold || (flags & I2C_F_POLL))
return 0;
return rw_enter(&sc->sc_i2c_lock, RW_WRITE | RW_INTR);
}
void
tsciic_release_bus(void *cookie, int flags)
{
struct tsciic_softc *sc = cookie;
if (cold || (flags & I2C_F_POLL))
return;
rw_exit(&sc->sc_i2c_lock);
}
int
tsciic_send_start(void *cookie, int flags)
{
return i2c_bitbang_send_start(cookie, flags, &tsciicbb_ops);
}
int
tsciic_send_stop(void *cookie, int flags)
{
return i2c_bitbang_send_stop(cookie, flags, &tsciicbb_ops);
}
int
tsciic_initiate_xfer(void *cookie, i2c_addr_t addr, int flags)
{
return i2c_bitbang_initiate_xfer(cookie, addr, flags, &tsciicbb_ops);
}
int
tsciic_read_byte(void *cookie, uint8_t *valp, int flags)
{
return i2c_bitbang_read_byte(cookie, valp, flags, &tsciicbb_ops);
}
int
tsciic_write_byte(void *cookie, uint8_t val, int flags)
{
return i2c_bitbang_write_byte(cookie, val, flags, &tsciicbb_ops);
}
/* I2C bitbanging */
void
tsciicbb_set_bits(void *cookie, uint32_t bits)
{
uint64_t val;
val = (bits & MPD_BIT_SDA ? MPD_DS : 0) |
(bits & MPD_BIT_SCL ? MPD_CKS : 0);
alpha_mb();
STQP(TS_C_MPD) = val;
alpha_mb();
}
void
tsciicbb_set_dir(void *cookie, uint32_t dir)
{
/* Nothing to do */
}
uint32_t
tsciicbb_read(void *cookie)
{
uint64_t val;
uint32_t bits;
val = LDQP(TS_C_MPD);
bits = (val & MPD_DR ? MPD_BIT_SDA : 0) |
(val & MPD_CKR ? MPD_BIT_SCL : 0);
return bits;
}
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