Add support for the AXP209 Power System Management IC. This allows boards
with this and an Allwinner SoC to power off. Submitted by: Emmanuel Vadot <manu@bidouilliste.com> Differential Revision: https://reviews.freebsd.org/D4954
This commit is contained in:
Andrew Turner
parent
4d1defda24
commit
2ff143af3f
182
sys/arm/allwinner/axp209.c
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182
sys/arm/allwinner/axp209.c
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/*-
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* Copyright (c) 2015 Emmanuel Vadot <manu@bidouilliste.com>
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* X-Power AXP209 PMU for Allwinner SoCs
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*/
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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/kernel.h>
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#include <sys/module.h>
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#include <sys/clock.h>
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#include <sys/time.h>
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#include <sys/bus.h>
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#include <sys/proc.h>
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#include <sys/reboot.h>
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#include <sys/resource.h>
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#include <sys/rman.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/openfirm.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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/* Power State Register */
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#define AXP209_PSR 0x00
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#define AXP209_PSR_ACIN 0x80
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#define AXP209_PSR_VBUS 0x20
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/* Shutdown and battery control */
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#define AXP209_SHUTBAT 0x32
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#define AXP209_SHUTBAT_SHUTDOWN 0x80
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struct axp209_softc {
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uint32_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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axp209_read(device_t dev, uint8_t reg, uint8_t *data, uint8_t size)
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{
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struct axp209_softc *sc = device_get_softc(dev);
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struct iic_msg msg[2];
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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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axp209_write(device_t dev, uint8_t reg, uint8_t data)
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{
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uint8_t buffer[2];
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struct axp209_softc *sc = device_get_softc(dev);
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struct iic_msg msg;
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buffer[0] = reg;
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buffer[1] = data;
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msg.slave = sc->addr;
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msg.flags = IIC_M_WR;
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msg.len = 2;
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msg.buf = buffer;
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return (iicbus_transfer(dev, &msg, 1));
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}
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static void
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axp209_shutdown(void *devp, int howto)
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{
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device_t dev;
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if (!(howto & RB_POWEROFF))
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return;
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dev = (device_t)devp;
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if (bootverbose)
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device_printf(dev, "Shutdown AXP209\n");
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axp209_write(dev, AXP209_SHUTBAT, AXP209_SHUTBAT_SHUTDOWN);
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}
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static int
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axp209_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_is_compatible(dev, "x-powers,axp209"))
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return (ENXIO);
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device_set_desc(dev, "X-Power AXP209 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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axp209_attach(device_t dev)
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{
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struct axp209_softc *sc;
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uint8_t data;
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uint8_t pwr_src;
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char pwr_name[4][11] = {"Battery", "AC", "USB", "AC and USB"};
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sc = device_get_softc(dev);
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sc->addr = iicbus_get_addr(dev);
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/*
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* Read the Power State register
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* bit 7 is AC presence, bit 5 is VBUS presence.
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* If none are set then we are running from battery (obviously).
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*/
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axp209_read(dev, AXP209_PSR, &data, 1);
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pwr_src = ((data & AXP209_PSR_ACIN) >> 7) |
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((data & AXP209_PSR_VBUS) >> 4);
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if (bootverbose)
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device_printf(dev, "AXP209 Powered by %s\n",
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pwr_name[pwr_src]);
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EVENTHANDLER_REGISTER(shutdown_final, axp209_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 axp209_methods[] = {
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DEVMETHOD(device_probe, axp209_probe),
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DEVMETHOD(device_attach, axp209_attach),
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{0, 0},
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};
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static driver_t axp209_driver = {
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"axp209_pmu",
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axp209_methods,
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sizeof(struct axp209_softc),
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};
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static devclass_t axp209_devclass;
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DRIVER_MODULE(axp209, iicbus, axp209_driver, axp209_devclass, 0, 0);
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MODULE_VERSION(axp209, 1);
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MODULE_DEPEND(axp209, iicbus, 1, 1, 1);
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@ -11,6 +11,7 @@ arm/allwinner/a10_sramc.c standard
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arm/allwinner/a10_wdog.c standard
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arm/allwinner/a20/a20_cpu_cfg.c standard
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arm/allwinner/allwinner_machdep.c standard
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arm/allwinner/axp209.c optional axp209
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arm/allwinner/if_emac.c optional emac
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dev/iicbus/twsi/a10_twsi.c optional twsi
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#arm/allwinner/console.c standard
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