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As all the IIC controllers on system uses the same 'iichb' prefix we cannot

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rely only on checking the device unit to indentify the BSC unit we are
attaching to.  Make use of the device base address to identify our BSC unit.

Approved by:	adrian (mentor)
This commit is contained in:
Luiz Otavio O Souza 2013-11-12 13:34:07 +00:00
parent 8ce07fe72e
commit 21cb1342c0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=258045
2 changed files with 28 additions and 22 deletions
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45
sys/arm/broadcom/bcm2835/bcm2835_bsc.c
View File

@ -234,31 +234,13 @@ static int
bcm_bsc_attach(device_t dev)
{
struct bcm_bsc_softc *sc;
unsigned long start;
device_t gpio;
int rid;
if (device_get_unit(dev) > 1) {
device_printf(dev, "only bsc0 and bsc1 are supported\n");
return (ENXIO);
}
int i, rid;
sc = device_get_softc(dev);
sc->sc_dev = dev;
/*
* 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");
return (ENXIO);
}
bcm_gpio_set_alternate(gpio, bcm_bsc_pins[device_get_unit(dev)].sda,
BCM_GPIO_ALT0);
bcm_gpio_set_alternate(gpio, bcm_bsc_pins[device_get_unit(dev)].scl,
BCM_GPIO_ALT0);
rid = 0;
sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
@ -270,6 +252,29 @@ bcm_bsc_attach(device_t dev)
sc->sc_bst = rman_get_bustag(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)
break;
}
if (i == nitems(bcm_bsc_pins)) {
device_printf(dev, "only bsc0 and bsc1 are supported\n");
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");
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;
sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE | RF_SHAREABLE);

5
sys/arm/broadcom/bcm2835/bcm2835_bscvar.h
View File

@ -33,9 +33,10 @@
struct {
uint32_t sda;
uint32_t scl;
unsigned long start;
} bcm_bsc_pins[] = {
{ 0, 1 }, /* BSC0 GPIO pins. */
{ 2, 3 } /* BSC1 GPIO pins. */
{ 0, 1, 0x20205000 }, /* BSC0 GPIO pins and base address. */
{ 2, 3, 0x20804000 } /* BSC1 GPIO pins and base address. */
};
struct bcm_bsc_softc {