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/*-
* Copyright (c) 2012 Damjan Marion <dmarion@Freebsd.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 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 AUTHOR 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/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* TPS65217 PMIC companion chip for AM335x SoC sitting on I2C bus
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/eventhandler.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/clock.h>
#include <sys/time.h>
#include <sys/bus.h>
#include <sys/reboot.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <dev/iicbus/iicbus.h>
#include <dev/iicbus/iiconf.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/ti/am335x/am335x_rtcvar.h>
#include "iicbus_if.h"
#define TPS65217A 0x7
#define TPS65217B 0xF
#define TPS65217C 0xE
#define TPS65217D 0x6
/* TPS65217 Reisters */
#define TPS65217_CHIPID_REG 0x00
#define TPS65217_STATUS_REG 0x0A
#define TPS65217_STATUS_OFF (1U << 7)
#define TPS65217_STATUS_ACPWR (1U << 3)
#define TPS65217_STATUS_USBPWR (1U << 2)
#define TPS65217_STATUS_BT (1U << 0)
#define MAX_IIC_DATA_SIZE 2
struct am335x_pmic_softc {
device_t sc_dev;
uint32_t sc_addr;
struct intr_config_hook enum_hook;
};
static void am335x_pmic_shutdown(void *, int);
static int
am335x_pmic_read(device_t dev, uint8_t addr, uint8_t *data, uint8_t size)
{
struct am335x_pmic_softc *sc = device_get_softc(dev);
struct iic_msg msg[] = {
{ sc->sc_addr, IIC_M_WR, 1, &addr },
{ sc->sc_addr, IIC_M_RD, size, data },
};
return (iicbus_transfer(dev, msg, 2));
}
static int
am335x_pmic_write(device_t dev, uint8_t address, uint8_t *data, uint8_t size)
{
uint8_t buffer[MAX_IIC_DATA_SIZE + 1];
struct am335x_pmic_softc *sc = device_get_softc(dev);
struct iic_msg msg[] = {
{ sc->sc_addr, IIC_M_WR, size + 1, buffer },
};
if (size > MAX_IIC_DATA_SIZE)
return (ENOMEM);
buffer[0] = address;
memcpy(buffer + 1, data, size);
return (iicbus_transfer(dev, msg, 1));
}
static int
am335x_pmic_probe(device_t dev)
{
struct am335x_pmic_softc *sc;
if (!ofw_bus_is_compatible(dev, "ti,am335x-pmic"))
return (ENXIO);
sc = device_get_softc(dev);
sc->sc_dev = dev;
sc->sc_addr = iicbus_get_addr(dev);
device_set_desc(dev, "TI TPS65217 Power Management IC");
return (0);
}
static void
am335x_pmic_start(void *xdev)
{
struct am335x_pmic_softc *sc;
device_t dev = (device_t)xdev;
uint8_t reg;
char name[20];
char pwr[4][11] = {"Unknown", "USB", "AC", "USB and AC"};
sc = device_get_softc(dev);
am335x_pmic_read(dev, TPS65217_CHIPID_REG, ®, 1);
switch (reg>>4) {
case TPS65217A:
sprintf(name, "TPS65217A ver 1.%u", reg & 0xF);
break;
case TPS65217B:
sprintf(name, "TPS65217B ver 1.%u", reg & 0xF);
break;
case TPS65217C:
sprintf(name, "TPS65217C ver 1.%u", reg & 0xF);
break;
case TPS65217D:
sprintf(name, "TPS65217D ver 1.%u", reg & 0xF);
break;
default:
sprintf(name, "Unknown PMIC");
}
am335x_pmic_read(dev, TPS65217_STATUS_REG, ®, 1);
device_printf(dev, "%s powered by %s\n", name, pwr[(reg>>2)&0x03]);
EVENTHANDLER_REGISTER(shutdown_final, am335x_pmic_shutdown, dev,
SHUTDOWN_PRI_LAST);
config_intrhook_disestablish(&sc->enum_hook);
}
static int
am335x_pmic_attach(device_t dev)
{
struct am335x_pmic_softc *sc;
sc = device_get_softc(dev);
sc->enum_hook.ich_func = am335x_pmic_start;
sc->enum_hook.ich_arg = dev;
if (config_intrhook_establish(&sc->enum_hook) != 0)
return (ENOMEM);
return (0);
}
static void
am335x_pmic_shutdown(void *xdev, int howto)
{
device_t dev;
uint8_t reg;
if (!(howto & RB_POWEROFF))
return;
dev = (device_t)xdev;
/* Set the OFF bit on status register to start the shutdown sequence. */
reg = TPS65217_STATUS_OFF;
am335x_pmic_write(dev, TPS65217_STATUS_REG, ®, 1);
/* Toggle pmic_pwr_enable to shutdown the PMIC. */
am335x_rtc_pmic_pwr_toggle();
}
static device_method_t am335x_pmic_methods[] = {
DEVMETHOD(device_probe, am335x_pmic_probe),
DEVMETHOD(device_attach, am335x_pmic_attach),
{0, 0},
};
static driver_t am335x_pmic_driver = {
"am335x_pmic",
am335x_pmic_methods,
sizeof(struct am335x_pmic_softc),
};
static devclass_t am335x_pmic_devclass;
DRIVER_MODULE(am335x_pmic, iicbus, am335x_pmic_driver, am335x_pmic_devclass, 0, 0);
MODULE_VERSION(am335x_pmic, 1);
MODULE_DEPEND(am335x_pmic, iicbus, 1, 1, 1);
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