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Allow RSB to be used from interrupt handlers.

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The driver uses polling mode if cold or !THREAD_CAN_SLEEP() and now
implements the bus_* interface.
This commit is contained in:
Jared McNeill 2016-05-15 15:52:34 +00:00
parent 1dd6c13536
commit 37cc9a031b
1 changed files with 16 additions and 3 deletions
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19
sys/arm/allwinner/aw_rsb.c
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@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/module.h>
#include <machine/bus.h>
@ -201,21 +202,22 @@ static int
rsb_start(device_t dev)
{
struct rsb_softc *sc;
int error, retry;
int error, retry, polling;
sc = device_get_softc(dev);
polling = cold || !THREAD_CAN_SLEEP();
RSB_ASSERT_LOCKED(sc);
/* Enable interrupts */
if (!cold)
if (!polling)
RSB_WRITE(sc, RSB_INTE, INT_MASK);
/* Start the transfer */
RSB_WRITE(sc, RSB_CTRL, GLOBAL_INT_ENB | START_TRANS);
/* Wait for transfer to complete */
if (cold) {
if (polling) {
error = ETIMEDOUT;
for (retry = RSB_I2C_TIMEOUT; retry > 0; retry--) {
sc->status |= RSB_READ(sc, RSB_INTS);
@ -482,6 +484,17 @@ static device_method_t rsb_methods[] = {
DEVMETHOD(device_probe, rsb_probe),
DEVMETHOD(device_attach, rsb_attach),
/* Bus interface */
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
/* OFW methods */
DEVMETHOD(ofw_bus_get_node, rsb_get_node),