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NetBSD/sys/dev/ic/pca9564.c
thorpej 2685996b0e Merge thorpej-cfargs branch: 
Simplify and make extensible the config_search() / config_found() /
config_attach() interfaces: rather than having different variants for
which arguments you want pass along, just have a single call that
takes a variadic list of tag-value arguments.

Adjust all call sites:
- Simplify wherever possible; don't pass along arguments that aren't
  actually needed.
- Don't be explicit about what interface attribute is attaching if
  the device only has one.  (More simplification.)
- Add a config_probe() function to be used in indirect configuiration
  situations, making is visibly easier to see when indirect config is
  in play, and allowing for future change in semantics.  (As of now,
  this is just a wrapper around config_match(), but that is an
  implementation detail.)

Remove unnecessary or redundant interface attributes where they're not
needed.

There are currently 5 "cfargs" defined:
- CFARG_SUBMATCH (submatch function for direct config)
- CFARG_SEARCH (search function for indirect config)
- CFARG_IATTR (interface attribte)
- CFARG_LOCATORS (locators array)
- CFARG_DEVHANDLE (devhandle_t - wraps OFW, ACPI, etc. handles)

...and a sentinel value CFARG_EOL.

Add some extra sanity checking to ensure that interface attributes
aren't ambiguous.

Use CFARG_DEVHANDLE in MI FDT, OFW, and ACPI code, and macppc and shark
ports to associate those device handles with device_t instance.  This
will trickle trough to more places over time (need back-end for pre-OFW
Sun OBP; any others?).
2021-04-24 23:36:23 +00:00

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/* $NetBSD: pca9564.c,v 1.4 2021/04/24 23:36:55 thorpej Exp $ */
/*
* Copyright (c) 2010 NONAKA Kimihiro <nonaka@netbsd.org>
* 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.
*
* 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pca9564.c,v 1.4 2021/04/24 23:36:55 thorpej Exp $");
#include <sys/param.h>
#include <sys/device.h>
#include <sys/mutex.h>
#include <sys/bus.h>
#include <dev/i2c/i2cvar.h>
#include <dev/ic/pca9564reg.h>
#include <dev/ic/pca9564var.h>
#if defined(PCA9564_DEBUG)
int pca9564debug = 0;
#define DPRINTF(s) if (pca9564debug) printf s
#else
#define DPRINTF(s)
#endif
static int pca9564_acquire_bus(void *, int);
static void pca9564_release_bus(void *, int);
static int pca9564_send_start(void *, int);
static int pca9564_send_stop(void *, int);
static int pca9564_initiate_xfer(void *, uint16_t, int);
static int pca9564_read_byte(void *, uint8_t *, int);
static int pca9564_write_byte(void *, uint8_t, int);
static int pca9564_ack(void *, bool, int);
#define CSR_READ(sc, r) (*sc->sc_ios.read_byte)(sc->sc_dev, r)
#define CSR_WRITE(sc, r, v) (*sc->sc_ios.write_byte)(sc->sc_dev, r, v)
void
pca9564_attach(struct pca9564_softc *sc)
{
struct i2cbus_attach_args iba;
aprint_naive("\n");
aprint_normal(": PCA9564 I2C Controller\n");
iic_tag_init(&sc->sc_i2c);
sc->sc_i2c.ic_cookie = sc;
sc->sc_i2c.ic_acquire_bus = pca9564_acquire_bus;
sc->sc_i2c.ic_release_bus = pca9564_release_bus;
sc->sc_i2c.ic_send_start = pca9564_send_start;
sc->sc_i2c.ic_send_stop = pca9564_send_stop;
sc->sc_i2c.ic_initiate_xfer = pca9564_initiate_xfer;
sc->sc_i2c.ic_read_byte = pca9564_read_byte;
sc->sc_i2c.ic_write_byte = pca9564_write_byte;
/* set serial clock rate */
switch (sc->sc_i2c_clock) {
case 330000: /* 330kHz */
sc->sc_i2c_clock = I2CCON_CR_330KHZ;
break;
case 288000: /* 288kHz */
sc->sc_i2c_clock = I2CCON_CR_288KHZ;
break;
case 217000: /* 217kHz */
sc->sc_i2c_clock = I2CCON_CR_217KHZ;
break;
case 146000: /* 146kHz */
sc->sc_i2c_clock = I2CCON_CR_146KHZ;
break;
case 88000: /* 88kHz */
sc->sc_i2c_clock = I2CCON_CR_88KHZ;
break;
case 0: /* default */
case 59000: /* 59kHz */
sc->sc_i2c_clock = I2CCON_CR_59KHZ;
break;
case 44000: /* 44kHz */
sc->sc_i2c_clock = I2CCON_CR_44KHZ;
break;
case 36000: /* 36kHz */
sc->sc_i2c_clock = I2CCON_CR_36KHZ;
break;
default:
aprint_error_dev(sc->sc_dev, "unknown i2c clock %dHz\n",
sc->sc_i2c_clock);
sc->sc_i2c_clock = I2CCON_CR_59KHZ;
break;
}
memset(&iba, 0, sizeof(iba));
iba.iba_tag = &sc->sc_i2c;
config_found(sc->sc_dev, &iba, iicbus_print, CFARG_EOL);
}
static int
pca9564_acquire_bus(void *cookie, int flags)
{
struct pca9564_softc *sc = cookie;
uint8_t control;
/* Enable SIO and set clock */
control = CSR_READ(sc, PCA9564_I2CCON);
control |= I2CCON_ENSIO;
control &= ~(I2CCON_STA|I2CCON_STO|I2CCON_SI|I2CCON_AA);
control &= ~I2CCON_CR_MASK;
control |= sc->sc_i2c_clock;
CSR_WRITE(sc, PCA9564_I2CCON, control);
delay(500);
return 0;
}
static void
pca9564_release_bus(void *cookie, int flags)
{
struct pca9564_softc *sc = cookie;
uint8_t control;
/* Disable SIO */
control = CSR_READ(sc, PCA9564_I2CCON);
control &= ~I2CCON_ENSIO;
CSR_WRITE(sc, PCA9564_I2CCON, control);
}
#define PCA9564_TIMEOUT 100 /* protocol timeout, in uSecs */
static int
pca9564_wait(struct pca9564_softc *sc, int flags)
{
int timeout;
DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA)));
for (timeout = PCA9564_TIMEOUT; timeout > 0; timeout--) {
if (CSR_READ(sc, PCA9564_I2CCON) & I2CCON_SI)
break;
delay(1);
}
DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA)));
if (timeout == 0) {
aprint_error_dev(sc->sc_dev, "timeout\n");
return ETIMEDOUT;
}
return 0;
}
static int
pca9564_send_start(void *cookie, int flags)
{
struct pca9564_softc *sc = cookie;
uint8_t control;
DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA)));
control = CSR_READ(sc, PCA9564_I2CCON);
control |= I2CCON_STA;
control &= ~(I2CCON_STO|I2CCON_SI);
CSR_WRITE(sc, PCA9564_I2CCON, control);
DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA)));
return pca9564_wait(sc, flags);
}
static int
pca9564_send_stop(void *cookie, int flags)
{
struct pca9564_softc *sc = cookie;
uint8_t control;
DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA)));
control = CSR_READ(sc, PCA9564_I2CCON);
control |= I2CCON_STO;
control &= ~(I2CCON_STA|I2CCON_SI);
CSR_WRITE(sc, PCA9564_I2CCON, control);
DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA)));
return 0;
}
static int
pca9564_initiate_xfer(void *cookie, uint16_t addr, int flags)
{
struct pca9564_softc *sc = cookie;
int error, rd_req = (flags & I2C_F_READ) != 0;
uint8_t data, control;
error = pca9564_send_start(sc, flags);
if (error) {
aprint_error_dev(sc->sc_dev, "failed to send start %s xfer\n",
rd_req ? "read" : "write");
return error;
}
DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA)));
control = CSR_READ(sc, PCA9564_I2CCON);
data = (addr << 1) | (rd_req ? 1 : 0);
CSR_WRITE(sc, PCA9564_I2CDAT, data);
control &= ~(I2CCON_STO|I2CCON_STA|I2CCON_SI);
CSR_WRITE(sc, PCA9564_I2CCON, control);
DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA)));
error = pca9564_wait(sc, flags);
if (error)
aprint_error_dev(sc->sc_dev, "failed to initiate %s xfer\n",
rd_req ? "read" : "write");
return error;
}
static int
pca9564_read_byte(void *cookie, uint8_t *bytep, int flags)
{
struct pca9564_softc *sc = cookie;
int send_stop = (flags & I2C_F_STOP) != 0;
int error;
error = pca9564_ack(sc, !send_stop, flags);
if (error) {
aprint_error_dev(sc->sc_dev, "failed to ack\n");
return error;
}
DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA)));
*bytep = CSR_READ(sc, PCA9564_I2CDAT);
DPRINTF(("%s: status=%#x, byte=%#x\n", __func__,
CSR_READ(sc, PCA9564_I2CSTA), *bytep));
if (send_stop)
pca9564_send_stop(sc, flags);
return 0;
}
static int
pca9564_write_byte(void *cookie, uint8_t byte, int flags)
{
struct pca9564_softc *sc = cookie;
int send_stop = (flags & I2C_F_STOP) != 0;
int error;
uint8_t control;
DPRINTF(("%s: status=%#x, byte=%#x\n", __func__,
CSR_READ(sc, PCA9564_I2CSTA), byte));
control = CSR_READ(sc, PCA9564_I2CCON);
CSR_WRITE(sc, PCA9564_I2CDAT, byte);
control &= ~(I2CCON_STO|I2CCON_STA|I2CCON_SI);
CSR_WRITE(sc, PCA9564_I2CCON, control);
DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA)));
error = pca9564_wait(sc, flags);
if (error)
aprint_error_dev(sc->sc_dev, "write byte failed\n");
if (send_stop)
pca9564_send_stop(sc, flags);
return error;
}
static int
pca9564_ack(void *cookie, bool ack, int flags)
{
struct pca9564_softc *sc = cookie;
uint8_t control;
DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA)));
control = CSR_READ(sc, PCA9564_I2CCON);
control &= ~(I2CCON_STO|I2CCON_STA|I2CCON_SI|I2CCON_AA);
if (ack)
control |= I2CCON_AA;
CSR_WRITE(sc, PCA9564_I2CCON, control);
DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA)));
return pca9564_wait(sc, flags);
}
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