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Add support for the power button on BeagleBone Black.

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Shutdown and turn off the board when the power button is pressed.

Submitted by:	Michal Meloun <meloun@miracle.cz>
Relnotes:	yes
This commit is contained in:
loos 2015-05-13 01:10:28 +00:00
parent 1493021aa5
commit 249a98951b
2 changed files with 75 additions and 6 deletions
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67
sys/arm/ti/am335x/am335x_pmic.c
View File

@ -37,6 +37,7 @@ __FBSDID("$FreeBSD$");
#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>
@ -59,6 +60,14 @@ __FBSDID("$FreeBSD$");
/* TPS65217 Reisters */
#define TPS65217_CHIPID_REG 0x00
#define TPS65217_INT_REG 0x02
#define TPS65217_INT_PBM (1U << 6)
#define TPS65217_INT_ACM (1U << 5)
#define TPS65217_INT_USBM (1U << 4)
#define TPS65217_INT_PBI (1U << 2)
#define TPS65217_INT_ACI (1U << 1)
#define TPS65217_INT_USBI (1U << 0)
#define TPS65217_STATUS_REG 0x0A
#define TPS65217_STATUS_OFF (1U << 7)
#define TPS65217_STATUS_ACPWR (1U << 3)
@ -72,6 +81,8 @@ struct am335x_pmic_softc {
device_t sc_dev;
uint32_t sc_addr;
struct intr_config_hook enum_hook;
struct resource *sc_irq_res;
void *sc_intrhand;
};
static void am335x_pmic_shutdown(void *, int);
@ -105,6 +116,38 @@ am335x_pmic_write(device_t dev, uint8_t address, uint8_t *data, uint8_t size)
return (iicbus_transfer(dev, msg, 1));
}
static void
am335x_pmic_intr(void *arg)
{
struct am335x_pmic_softc *sc = (struct am335x_pmic_softc *)arg;
uint8_t int_reg, status_reg;
int rv;
char notify_buf[16];
THREAD_SLEEPING_OK();
rv = am335x_pmic_read(sc->sc_dev, TPS65217_INT_REG, &int_reg, 1);
if (rv != 0) {
device_printf(sc->sc_dev, "Cannot read interrupt register\n");
THREAD_NO_SLEEPING();
return;
}
rv = am335x_pmic_read(sc->sc_dev, TPS65217_STATUS_REG, &status_reg, 1);
if (rv != 0) {
device_printf(sc->sc_dev, "Cannot read status register\n");
THREAD_NO_SLEEPING();
return;
}
THREAD_NO_SLEEPING();
if ((int_reg & TPS65217_INT_PBI) && (status_reg & TPS65217_STATUS_BT))
shutdown_nice(RB_POWEROFF);
if (int_reg & TPS65217_INT_ACI) {
snprintf(notify_buf, sizeof(notify_buf), "notify=0x%02x",
(status_reg & TPS65217_STATUS_ACPWR) ? 1 : 0);
devctl_notify_f("ACPI", "ACAD", "power", notify_buf, M_NOWAIT);
}
}
static int
am335x_pmic_probe(device_t dev)
{
@ -130,6 +173,7 @@ am335x_pmic_start(void *xdev)
uint8_t reg;
char name[20];
char pwr[4][11] = {"Unknown", "USB", "AC", "USB and AC"};
int rv;
sc = device_get_softc(dev);
@ -158,15 +202,38 @@ am335x_pmic_start(void *xdev)
SHUTDOWN_PRI_LAST);
config_intrhook_disestablish(&sc->enum_hook);
/* Unmask all interrupts and clear pending status */
reg = 0;
am335x_pmic_write(dev, TPS65217_INT_REG, &reg, 1);
am335x_pmic_read(dev, TPS65217_INT_REG, &reg, 1);
if (sc->sc_irq_res != NULL) {
rv = bus_setup_intr(dev, sc->sc_irq_res,
INTR_TYPE_MISC | INTR_MPSAFE, NULL, am335x_pmic_intr,
sc, &sc->sc_intrhand);
if (rv != 0)
device_printf(dev,
"Unable to setup the irq handler.\n");
}
}
static int
am335x_pmic_attach(device_t dev)
{
struct am335x_pmic_softc *sc;
int rid;
sc = device_get_softc(dev);
rid = 0;
sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE);
if (!sc->sc_irq_res) {
device_printf(dev, "cannot allocate interrupt\n");
/* return (ENXIO); */
}
sc->enum_hook.ich_func = am335x_pmic_start;
sc->enum_hook.ich_arg = dev;

2
sys/boot/fdt/dts/arm/beaglebone-black.dts
View File

@ -149,6 +149,8 @@
pmic@48 {
compatible = "ti,am335x-pmic";
reg = <0x48>;
interrupts = <7>; /* nNMI */
interrupt-parent = <&AINTC>;
};
};
};