Add a basic driver for X-Powers AXP813 and AXP818 power management ICs.
This driver simply installs a shutdown event handler for handling RB_POWEROFF at shutdown. Tested on a Sinovoip BananaPi BPI-M3.
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jmcneill
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180
sys/arm/allwinner/axp81x.c
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sys/arm/allwinner/axp81x.c
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/*-
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* Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* X-Powers AXP813/818 PMU for Allwinner SoCs
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/eventhandler.h>
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#include <sys/bus.h>
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#include <sys/rman.h>
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#include <sys/kernel.h>
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#include <sys/reboot.h>
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#include <sys/module.h>
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#include <machine/bus.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include "iicbus_if.h"
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#define AXP_ICTYPE 0x03
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#define AXP_POWERBAT 0x32
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#define AXP_POWERBAT_SHUTDOWN (1 << 7)
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static struct ofw_compat_data compat_data[] = {
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{ "x-powers,axp813", 1 },
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{ "x-powers,axp818", 1 },
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{ NULL, 0 }
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};
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struct axp81x_softc {
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uint16_t addr;
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struct intr_config_hook enum_hook;
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};
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static int
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axp81x_read(device_t dev, uint8_t reg, uint8_t *data, uint8_t size)
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{
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struct axp81x_softc *sc;
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struct iic_msg msg[2];
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sc = device_get_softc(dev);
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msg[0].slave = sc->addr;
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msg[0].flags = IIC_M_WR;
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msg[0].len = 1;
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msg[0].buf = ®
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msg[1].slave = sc->addr;
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msg[1].flags = IIC_M_RD;
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msg[1].len = size;
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msg[1].buf = data;
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return (iicbus_transfer(dev, msg, 2));
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}
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static int
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axp81x_write(device_t dev, uint8_t reg, uint8_t val)
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{
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struct axp81x_softc *sc;
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struct iic_msg msg[2];
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sc = device_get_softc(dev);
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msg[0].slave = sc->addr;
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msg[0].flags = IIC_M_WR;
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msg[0].len = 1;
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msg[0].buf = ®
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msg[1].slave = sc->addr;
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msg[1].flags = IIC_M_WR;
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msg[1].len = 1;
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msg[1].buf = &val;
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return (iicbus_transfer(dev, msg, 2));
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}
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static void
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axp81x_shutdown(void *devp, int howto)
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{
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device_t dev;
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if ((howto & RB_POWEROFF) == 0)
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return;
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dev = devp;
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if (bootverbose)
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device_printf(dev, "Shutdown AXP81x\n");
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axp81x_write(dev, AXP_POWERBAT, AXP_POWERBAT_SHUTDOWN);
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}
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static int
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axp81x_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
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return (ENXIO);
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device_set_desc(dev, "X-Powers AXP81x Power Management Unit");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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axp81x_attach(device_t dev)
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{
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struct axp81x_softc *sc;
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uint8_t chip_id;
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sc = device_get_softc(dev);
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sc->addr = iicbus_get_addr(dev);
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if (bootverbose) {
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axp81x_read(dev, AXP_ICTYPE, &chip_id, 1);
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device_printf(dev, "chip ID 0x%02x\n", chip_id);
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}
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EVENTHANDLER_REGISTER(shutdown_final, axp81x_shutdown, dev,
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SHUTDOWN_PRI_LAST);
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return (0);
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}
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static device_method_t axp81x_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, axp81x_probe),
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DEVMETHOD(device_attach, axp81x_attach),
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DEVMETHOD_END
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};
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static driver_t axp81x_driver = {
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"axp81x_pmu",
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axp81x_methods,
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sizeof(struct axp81x_softc),
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};
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static devclass_t axp81x_devclass;
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DRIVER_MODULE(axp81x, iicbus, axp81x_driver, axp81x_devclass, 0, 0);
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MODULE_VERSION(axp81x, 1);
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MODULE_DEPEND(axp81x, iicbus, 1, 1, 1);
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