NetBSD-5.0.2/sys/arch/macppc/dev/ki2c.c
/* $NetBSD: ki2c.c,v 1.11 2007/12/06 17:00:33 ad Exp $ */
/* Id: ki2c.c,v 1.7 2002/10/05 09:56:05 tsubai Exp */
/*-
* Copyright (c) 2001 Tsubai Masanari. All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/device.h>
#include <sys/systm.h>
#include <sys/mutex.h>
#include <dev/ofw/openfirm.h>
#include <uvm/uvm_extern.h>
#include <machine/autoconf.h>
#include <macppc/dev/ki2cvar.h>
int ki2c_match(struct device *, struct cfdata *, void *);
void ki2c_attach(struct device *, struct device *, void *);
inline u_int ki2c_readreg(struct ki2c_softc *, int);
inline void ki2c_writereg(struct ki2c_softc *, int, u_int);
u_int ki2c_getmode(struct ki2c_softc *);
void ki2c_setmode(struct ki2c_softc *, u_int);
u_int ki2c_getspeed(struct ki2c_softc *);
void ki2c_setspeed(struct ki2c_softc *, u_int);
int ki2c_intr(struct ki2c_softc *);
int ki2c_poll(struct ki2c_softc *, int);
int ki2c_start(struct ki2c_softc *, int, int, void *, int);
int ki2c_read(struct ki2c_softc *, int, int, void *, int);
int ki2c_write(struct ki2c_softc *, int, int, void *, int);
int ki2c_print __P((void *, const char *));
/* I2C glue */
static int ki2c_i2c_acquire_bus(void *, int);
static void ki2c_i2c_release_bus(void *, int);
static int ki2c_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t,
void *, size_t, int);
CFATTACH_DECL(ki2c, sizeof(struct ki2c_softc), ki2c_match, ki2c_attach,
NULL, NULL);
int
ki2c_match(parent, match, aux)
struct device *parent;
struct cfdata *match;
void *aux;
{
struct confargs *ca = aux;
if (strcmp(ca->ca_name, "i2c") == 0)
return 1;
return 0;
}
void
ki2c_attach(parent, self, aux)
struct device *parent;
struct device *self;
void *aux;
{
struct ki2c_softc *sc = (struct ki2c_softc *)self;
struct confargs *ca = aux;
int node = ca->ca_node;
int rate, child, namelen, i2cbus;
struct ki2c_confargs ka;
struct i2cbus_attach_args iba;
char name[32];
u_int reg[20];
ca->ca_reg[0] += ca->ca_baseaddr;
if (OF_getprop(node, "AAPL,i2c-rate", &rate, 4) != 4) {
printf(": cannot get i2c-rate\n");
return;
}
if (OF_getprop(node, "AAPL,address", &sc->sc_reg, 4) != 4) {
printf(": unable to find i2c address\n");
return;
}
if (OF_getprop(node, "AAPL,address-step", &sc->sc_regstep, 4) != 4) {
printf(": unable to find i2c address step\n");
return;
}
printf("\n");
ki2c_writereg(sc, STATUS, 0);
ki2c_writereg(sc, ISR, 0);
ki2c_writereg(sc, IER, 0);
ki2c_setmode(sc, I2C_STDSUBMODE);
ki2c_setspeed(sc, I2C_100kHz); /* XXX rate */
mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE);
ki2c_writereg(sc, IER,I2C_INT_DATA|I2C_INT_ADDR|I2C_INT_STOP);
/* fill in the i2c tag */
sc->sc_i2c.ic_cookie = sc;
sc->sc_i2c.ic_acquire_bus = ki2c_i2c_acquire_bus;
sc->sc_i2c.ic_release_bus = ki2c_i2c_release_bus;
sc->sc_i2c.ic_send_start = NULL;
sc->sc_i2c.ic_send_stop = NULL;
sc->sc_i2c.ic_initiate_xfer = NULL;
sc->sc_i2c.ic_read_byte = NULL;
sc->sc_i2c.ic_write_byte = NULL;
sc->sc_i2c.ic_exec = ki2c_i2c_exec;
iba.iba_tag = &sc->sc_i2c;
(void) config_found_ia(&sc->sc_dev, "i2cbus", &iba, iicbus_print);
/*
* newer OF puts I2C devices under 'i2c-bus' instead of attaching them
* directly to the ki2c node so we just check if we have a child named
* 'i2c-bus' and if so we attach its children, not ours
*/
i2cbus = 0;
child = OF_child(node);
while ((child != 0) && (i2cbus == 0)) {
OF_getprop(child, "name", name, sizeof(name));
if (strcmp(name, "i2c-bus") == 0)
i2cbus = child;
child = OF_peer(child);
}
if (i2cbus == 0)
i2cbus = node;
for (child = OF_child(i2cbus); child; child = OF_peer(child)) {
int ok = 0;
namelen = OF_getprop(child, "name", name, sizeof(name));
if (namelen < 0)
continue;
if (namelen >= sizeof(name))
continue;
name[namelen] = 0;
ka.ka_name = name;
ka.ka_node = child;
ok = OF_getprop(child, "reg", reg, sizeof(reg));
if (ok <= 0) {
ok = OF_getprop(child, "i2c-address", reg,
sizeof(reg));
}
if (ok > 0) {
ka.ka_addr = reg[0];
ka.ka_tag = &sc->sc_i2c;
config_found_ia(self, "ki2c", &ka, ki2c_print);
}
#ifdef DIAGNOSTIC
else {
printf("%s: device (%s) has no reg or i2c-address property.\n",
sc->sc_dev.dv_xname, name);
}
#endif
}
}
int
ki2c_print(aux, ki2c)
void *aux;
const char *ki2c;
{
struct ki2c_confargs *ka = aux;
if (ki2c) {
aprint_normal("%s at %s", ka->ka_name, ki2c);
aprint_normal(" address 0x%x", ka->ka_addr);
}
return UNCONF;
}
u_int
ki2c_readreg(sc, reg)
struct ki2c_softc *sc;
int reg;
{
u_char *addr = sc->sc_reg + sc->sc_regstep * reg;
return *addr;
}
void
ki2c_writereg(sc, reg, val)
struct ki2c_softc *sc;
int reg;
u_int val;
{
u_char *addr = sc->sc_reg + sc->sc_regstep * reg;
*addr = val;
__asm volatile ("eieio");
delay(10);
}
u_int
ki2c_getmode(sc)
struct ki2c_softc *sc;
{
return ki2c_readreg(sc, MODE) & I2C_MODE;
}
void
ki2c_setmode(sc, mode)
struct ki2c_softc *sc;
u_int mode;
{
u_int x;
KASSERT((mode & ~I2C_MODE) == 0);
x = ki2c_readreg(sc, MODE);
x &= ~I2C_MODE;
x |= mode;
ki2c_writereg(sc, MODE, x);
}
u_int
ki2c_getspeed(sc)
struct ki2c_softc *sc;
{
return ki2c_readreg(sc, MODE) & I2C_SPEED;
}
void
ki2c_setspeed(sc, speed)
struct ki2c_softc *sc;
u_int speed;
{
u_int x;
KASSERT((speed & ~I2C_SPEED) == 0);
x = ki2c_readreg(sc, MODE);
x &= ~I2C_SPEED;
x |= speed;
ki2c_writereg(sc, MODE, x);
}
int
ki2c_intr(sc)
struct ki2c_softc *sc;
{
u_int isr, x;
isr = ki2c_readreg(sc, ISR);
if (isr & I2C_INT_ADDR) {
#if 0
if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) {
/* No slave responded. */
sc->sc_flags |= I2C_ERROR;
goto out;
}
#endif
if (sc->sc_flags & I2C_READING) {
if (sc->sc_resid > 1) {
x = ki2c_readreg(sc, CONTROL);
x |= I2C_CT_AAK;
ki2c_writereg(sc, CONTROL, x);
}
} else {
ki2c_writereg(sc, DATA, *sc->sc_data++);
sc->sc_resid--;
}
}
if (isr & I2C_INT_DATA) {
if (sc->sc_flags & I2C_READING) {
*sc->sc_data++ = ki2c_readreg(sc, DATA);
sc->sc_resid--;
if (sc->sc_resid == 0) { /* Completed */
ki2c_writereg(sc, CONTROL, 0);
goto out;
}
} else {
#if 0
if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) {
/* No slave responded. */
sc->sc_flags |= I2C_ERROR;
goto out;
}
#endif
if (sc->sc_resid == 0) {
x = ki2c_readreg(sc, CONTROL) | I2C_CT_STOP;
ki2c_writereg(sc, CONTROL, x);
} else {
ki2c_writereg(sc, DATA, *sc->sc_data++);
sc->sc_resid--;
}
}
}
out:
if (isr & I2C_INT_STOP) {
ki2c_writereg(sc, CONTROL, 0);
sc->sc_flags &= ~I2C_BUSY;
}
ki2c_writereg(sc, ISR, isr);
return 1;
}
int
ki2c_poll(sc, timo)
struct ki2c_softc *sc;
int timo;
{
while (sc->sc_flags & I2C_BUSY) {
if (ki2c_readreg(sc, ISR))
ki2c_intr(sc);
timo -= 100;
if (timo < 0) {
printf("i2c_poll: timeout\n");
return -1;
}
delay(100);
}
return 0;
}
int
ki2c_start(sc, addr, subaddr, data, len)
struct ki2c_softc *sc;
int addr, subaddr, len;
void *data;
{
int rw = (sc->sc_flags & I2C_READING) ? 1 : 0;
int timo, x;
KASSERT((addr & 1) == 0);
sc->sc_data = data;
sc->sc_resid = len;
sc->sc_flags |= I2C_BUSY;
timo = 1000 + len * 200;
/* XXX TAS3001 sometimes takes 50ms to finish writing registers. */
/* if (addr == 0x68) */
timo += 100000;
ki2c_writereg(sc, ADDR, addr | rw);
ki2c_writereg(sc, SUBADDR, subaddr);
x = ki2c_readreg(sc, CONTROL) | I2C_CT_ADDR;
ki2c_writereg(sc, CONTROL, x);
if (ki2c_poll(sc, timo))
return -1;
if (sc->sc_flags & I2C_ERROR) {
printf("I2C_ERROR\n");
return -1;
}
return 0;
}
int
ki2c_read(sc, addr, subaddr, data, len)
struct ki2c_softc *sc;
int addr, subaddr, len;
void *data;
{
sc->sc_flags = I2C_READING;
#ifdef KI2C_DEBUG
printf("ki2c_read: %02x %d\n", addr, len);
#endif
return ki2c_start(sc, addr, subaddr, data, len);
}
int
ki2c_write(sc, addr, subaddr, data, len)
struct ki2c_softc *sc;
int addr, subaddr, len;
void *data;
{
sc->sc_flags = 0;
#ifdef KI2C_DEBUG
printf("ki2c_write: %02x %d\n",addr,len);
#endif
return ki2c_start(sc, addr, subaddr, data, len);
}
static int
ki2c_i2c_acquire_bus(void *cookie, int flags)
{
struct ki2c_softc *sc = cookie;
mutex_enter(&sc->sc_buslock);
return 0;
}
static void
ki2c_i2c_release_bus(void *cookie, int flags)
{
struct ki2c_softc *sc = cookie;
mutex_exit(&sc->sc_buslock);
}
int
ki2c_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *vcmd,
size_t cmdlen, void *vbuf, size_t buflen, int flags)
{
struct ki2c_softc *sc = cookie;
/* we handle the subaddress stuff ourselves */
ki2c_setmode(sc, I2C_STDMODE);
if (ki2c_write(sc, addr, 0, __UNCONST(vcmd), cmdlen) !=0 )
return -1;
if (I2C_OP_READ_P(op)) {
if (ki2c_read(sc, addr, 0, vbuf, buflen) !=0 )
return -1;
}
return 0;
}