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

2 files changed, 183 insertions, 0 deletions

diff --git a/sys/arm/allwinner/axp209.c b/sys/arm/allwinner/axp209.c
new file mode 100644
index 0000000..11479fa
--- /dev/null
+++ b/sys/arm/allwinner/axp209.c
@@ -0,0 +1,182 @@
+/*-
+ * Copyright (c) 2015 Emmanuel Vadot <manu@bidouilliste.com>
+ * 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("$FreeBSD$");
+/*
+* X-Power AXP209 PMU for Allwinner SoCs
+*/
+#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/proc.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 "iicbus_if.h"
+
+/* Power State Register */
+#define	AXP209_PSR		0x00
+#define	AXP209_PSR_ACIN		0x80
+#define	AXP209_PSR_VBUS		0x20
+
+/* Shutdown and battery control */
+#define	AXP209_SHUTBAT		0x32
+#define	AXP209_SHUTBAT_SHUTDOWN	0x80
+
+struct axp209_softc {
+	uint32_t		addr;
+	struct intr_config_hook enum_hook;
+};
+
+static int
+axp209_read(device_t dev, uint8_t reg, uint8_t *data, uint8_t size)
+{
+	struct axp209_softc *sc = device_get_softc(dev);
+	struct iic_msg msg[2];
+
+	msg[0].slave = sc->addr;
+	msg[0].flags = IIC_M_WR;
+	msg[0].len = 1;
+	msg[0].buf = &reg;
+
+	msg[1].slave = sc->addr;
+	msg[1].flags = IIC_M_RD;
+	msg[1].len = size;
+	msg[1].buf = data;
+
+	return (iicbus_transfer(dev, msg, 2));
+}
+
+static int
+axp209_write(device_t dev, uint8_t reg, uint8_t data)
+{
+	uint8_t buffer[2];
+	struct axp209_softc *sc = device_get_softc(dev);
+	struct iic_msg msg;
+
+	buffer[0] = reg;
+	buffer[1] = data;
+
+	msg.slave = sc->addr;
+	msg.flags = IIC_M_WR;
+	msg.len = 2;
+	msg.buf = buffer;
+
+	return (iicbus_transfer(dev, &msg, 1));
+}
+
+static void
+axp209_shutdown(void *devp, int howto)
+{
+	device_t dev;
+
+	if (!(howto & RB_POWEROFF))
+		return;
+	dev = (device_t)devp;
+
+	if (bootverbose)
+		device_printf(dev, "Shutdown AXP209\n");
+
+	axp209_write(dev, AXP209_SHUTBAT, AXP209_SHUTBAT_SHUTDOWN);
+}
+
+static int
+axp209_probe(device_t dev)
+{
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	if (!ofw_bus_is_compatible(dev, "x-powers,axp209"))
+		return (ENXIO);
+
+	device_set_desc(dev, "X-Power AXP209 Power Management Unit");
+
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+axp209_attach(device_t dev)
+{
+	struct axp209_softc *sc;
+	uint8_t data;
+	uint8_t pwr_src;
+	char pwr_name[4][11] = {"Battery", "AC", "USB", "AC and USB"};
+
+	sc = device_get_softc(dev);
+
+	sc->addr = iicbus_get_addr(dev);
+
+	/*
+	 * Read the Power State register
+	 * bit 7 is AC presence, bit 5 is VBUS presence.
+	 * If none are set then we are running from battery (obviously).
+	 */
+	axp209_read(dev, AXP209_PSR, &data, 1);
+	pwr_src = ((data & AXP209_PSR_ACIN) >> 7) |
+		  ((data & AXP209_PSR_VBUS) >> 4);
+
+	if (bootverbose)
+		device_printf(dev, "AXP209 Powered by %s\n",
+		    pwr_name[pwr_src]);
+
+	EVENTHANDLER_REGISTER(shutdown_final, axp209_shutdown, dev,
+	    SHUTDOWN_PRI_LAST);
+
+	return (0);
+}
+
+static device_method_t axp209_methods[] = {
+	DEVMETHOD(device_probe,		axp209_probe),
+	DEVMETHOD(device_attach,	axp209_attach),
+	{0, 0},
+};
+
+static driver_t axp209_driver = {
+	"axp209_pmu",
+	axp209_methods,
+	sizeof(struct axp209_softc),
+};
+
+static devclass_t axp209_devclass;
+
+DRIVER_MODULE(axp209, iicbus, axp209_driver, axp209_devclass, 0, 0);
+MODULE_VERSION(axp209, 1);
+MODULE_DEPEND(axp209, iicbus, 1, 1, 1);
diff --git a/sys/arm/allwinner/files.allwinner b/sys/arm/allwinner/files.allwinner
index 2db0da5..cc4dd48 100644
--- a/sys/arm/allwinner/files.allwinner
+++ b/sys/arm/allwinner/files.allwinner
@@ -11,6 +11,7 @@ arm/allwinner/a10_sramc.c		standard
 arm/allwinner/a10_wdog.c		standard
 arm/allwinner/a20/a20_cpu_cfg.c 	standard
 arm/allwinner/allwinner_machdep.c	standard
+arm/allwinner/axp209.c			optional	axp209
 arm/allwinner/if_emac.c			optional	emac
 dev/iicbus/twsi/a10_twsi.c		optional	twsi
 #arm/allwinner/console.c		standard