Page MenuHomeFreeBSD
Differential D14104 Diff 38645 sys/arm/broadcom/bcm2835/bcm2835_bsc.c

Changeset View

Standalone View

View Options

sys/arm/broadcom/bcm2835/bcm2835_bsc.c

Show First 20 Lines • Show All 94 Lines • ▼ Show 20 Lines
#include <sys/rman.h> #include <sys/rman.h>
#include <sys/sysctl.h> #include <sys/sysctl.h>
#include <dev/iicbus/iicbus.h> #include <dev/iicbus/iicbus.h>
#include <dev/iicbus/iiconf.h> #include <dev/iicbus/iiconf.h>
#include <dev/ofw/ofw_bus.h> #include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h> #include <dev/ofw/ofw_bus_subr.h>
#include <arm/broadcom/bcm2835/bcm2835_gpio.h>
#include <arm/broadcom/bcm2835/bcm2835_bscreg.h> #include <arm/broadcom/bcm2835/bcm2835_bscreg.h>
#include <arm/broadcom/bcm2835/bcm2835_bscvar.h> #include <arm/broadcom/bcm2835/bcm2835_bscvar.h>
#include "iicbus_if.h" #include "iicbus_if.h"
static struct ofw_compat_data compat_data[] = { static struct ofw_compat_data compat_data[] = {
{"broadcom,bcm2835-bsc", 1}, {"broadcom,bcm2835-bsc", 1},
{"brcm,bcm2708-i2c", 1}, {"brcm,bcm2708-i2c", 1},
▲ Show 20 Lines • Show All 181 Lines • ▼ Show 20 Linesbcm_bsc_probe(device_t dev)
return (BUS_PROBE_DEFAULT); return (BUS_PROBE_DEFAULT);
} }
static int static int
bcm_bsc_attach(device_t dev) bcm_bsc_attach(device_t dev)
{ {
struct bcm_bsc_softc *sc; struct bcm_bsc_softc *sc;
unsigned long start; int rid;
device_t gpio;
int i, rid;
sc = device_get_softc(dev); sc = device_get_softc(dev);
sc->sc_dev = dev; sc->sc_dev = dev;
rid = 0; rid = 0;
sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE); RF_ACTIVE);
if (!sc->sc_mem_res) { if (!sc->sc_mem_res) {
device_printf(dev, "cannot allocate memory window\n"); device_printf(dev, "cannot allocate memory window\n");
return (ENXIO); return (ENXIO);
} }
sc->sc_bst = rman_get_bustag(sc->sc_mem_res); sc->sc_bst = rman_get_bustag(sc->sc_mem_res);
sc->sc_bsh = rman_get_bushandle(sc->sc_mem_res); sc->sc_bsh = rman_get_bushandle(sc->sc_mem_res);
/* Check the unit we are attaching by its base address. */
start = rman_get_start(sc->sc_mem_res);
for (i = 0; i < nitems(bcm_bsc_pins); i++) {
if (bcm_bsc_pins[i].start == (start & BCM_BSC_BASE_MASK))
break;
}
if (i == nitems(bcm_bsc_pins)) {
device_printf(dev, "only bsc0 and bsc1 are supported\n");
bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
return (ENXIO);
}
/*
* Configure the GPIO pins to ALT0 function to enable BSC control
* over the pins.
*/
gpio = devclass_get_device(devclass_find("gpio"), 0);
if (!gpio) {
device_printf(dev, "cannot find gpio0\n");
bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
return (ENXIO);
}
bcm_gpio_set_alternate(gpio, bcm_bsc_pins[i].sda, BCM_GPIO_ALT0);
bcm_gpio_set_alternate(gpio, bcm_bsc_pins[i].scl, BCM_GPIO_ALT0);
rid = 0; rid = 0;
sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE | RF_SHAREABLE); RF_ACTIVE | RF_SHAREABLE);
if (!sc->sc_irq_res) { if (!sc->sc_irq_res) {
bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res); bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
device_printf(dev, "cannot allocate interrupt\n"); device_printf(dev, "cannot allocate interrupt\n");
return (ENXIO); return (ENXIO);
▲ Show 20 Lines • Show All 403 Lines • Show Last 20 Lines