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sys/arm/broadcom/bcm2835/bcm2835_intr.c

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#include <machine/bus.h> #include <machine/bus.h>
#include <machine/intr.h> #include <machine/intr.h>
#include <dev/fdt/fdt_common.h> #include <dev/fdt/fdt_common.h>
#include <dev/ofw/openfirm.h> #include <dev/ofw/openfirm.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 "pic_if.h"
#define INTC_PENDING_BASIC 0x00 #define INTC_PENDING_BASIC 0x00
#define INTC_PENDING_BANK1 0x04 #define INTC_PENDING_BANK1 0x04
#define INTC_PENDING_BANK2 0x08 #define INTC_PENDING_BANK2 0x08
#define INTC_FIQ_CONTROL 0x0C #define INTC_FIQ_CONTROL 0x0C
#define INTC_ENABLE_BANK1 0x10 #define INTC_ENABLE_BANK1 0x10
#define INTC_ENABLE_BANK2 0x14 #define INTC_ENABLE_BANK2 0x14
#define INTC_ENABLE_BASIC 0x18 #define INTC_ENABLE_BASIC 0x18
#define INTC_DISABLE_BANK1 0x1C #define INTC_DISABLE_BANK1 0x1C
#define INTC_DISABLE_BANK2 0x20 #define INTC_DISABLE_BANK2 0x20
#define INTC_DISABLE_BASIC 0x24 #define INTC_DISABLE_BASIC 0x24
#define BANK1_START 8 #define BANK1_START 8
#define BANK1_END (BANK1_START + 32 - 1) #define BANK1_END (BANK1_START + 32 - 1)
#define BANK2_START (BANK1_START + 32) #define BANK2_START (BANK1_START + 32)
#define BANK2_END (BANK2_START + 32 - 1) #define BANK2_END (BANK2_START + 32 - 1)
#define BANK3_START (BANK2_START + 32)
#define IS_IRQ_BASIC(n) (((n) >= 0) && ((n) < BANK1_START)) #define IS_IRQ_BASIC(n) (((n) >= 0) && ((n) < BANK1_START))
#define IS_IRQ_BANK1(n) (((n) >= BANK1_START) && ((n) <= BANK1_END)) #define IS_IRQ_BANK1(n) (((n) >= BANK1_START) && ((n) <= BANK1_END))
#define IS_IRQ_BANK2(n) (((n) >= BANK2_START) && ((n) <= BANK2_END)) #define IS_IRQ_BANK2(n) (((n) >= BANK2_START) && ((n) <= BANK2_END))
#define IRQ_BANK1(n) ((n) - BANK1_START) #define IRQ_BANK1(n) ((n) - BANK1_START)
#define IRQ_BANK2(n) ((n) - BANK2_START) #define IRQ_BANK2(n) ((n) - BANK2_START)
#ifdef DEBUG #ifdef DEBUG
#define dprintf(fmt, args...) printf(fmt, ##args) #define dprintf(fmt, args...) printf(fmt, ##args)
#else #else
#define dprintf(fmt, args...) #define dprintf(fmt, args...)
#endif #endif
struct bcm_intc_softc { struct bcm_intc_softc {
device_t sc_dev; device_t sc_dev;
struct resource * intc_res; struct resource * intc_mem_res;
struct resource * intc_irq_res;
void * intc_intrhand;
bus_space_tag_t intc_bst; bus_space_tag_t intc_bst;
bus_space_handle_t intc_bsh; bus_space_handle_t intc_bsh;
}; };
static struct bcm_intc_softc *bcm_intc_sc = NULL; #define intc_read_4(_sc, reg) \
bus_space_read_4(_sc->intc_bst, _sc->intc_bsh, reg)
#define intc_write_4(_sc, reg, val) \
bus_space_write_4(_sc->intc_bst, _sc->intc_bsh, reg, val)
#define intc_read_4(reg) \ static int bcm_intc_probe(device_t);
bus_space_read_4(bcm_intc_sc->intc_bst, bcm_intc_sc->intc_bsh, reg) static int bcm_intc_attach(device_t);
#define intc_write_4(reg, val) \ static int bcm_intc_intr(void *);
bus_space_write_4(bcm_intc_sc->intc_bst, bcm_intc_sc->intc_bsh, reg, val) static int bcm_intc_config(device_t, int, enum intr_trigger, enum intr_polarity);
static void bcm_intc_mask(device_t, int);
static void bcm_intc_unmask(device_t, int);
static int static int
bcm_intc_probe(device_t dev) bcm_intc_probe(device_t dev)
{ {
if (!ofw_bus_status_okay(dev)) if (!ofw_bus_status_okay(dev))
return (ENXIO); return (ENXIO);
if (!ofw_bus_is_compatible(dev, "broadcom,bcm2835-armctrl-ic")) if (!ofw_bus_is_compatible(dev, "broadcom,bcm2835-armctrl-ic"))
return (ENXIO); return (ENXIO);
device_set_desc(dev, "BCM2835 Interrupt Controller"); device_set_desc(dev, "BCM2835 Interrupt Controller");
return (BUS_PROBE_DEFAULT); return (BUS_PROBE_DEFAULT);
} }
static int static int
bcm_intc_attach(device_t dev) bcm_intc_attach(device_t dev)
{ {
struct bcm_intc_softc *sc = device_get_softc(dev); struct bcm_intc_softc *sc = device_get_softc(dev);
int rid = 0; int rid;
sc->sc_dev = dev; sc->sc_dev = dev;
if (bcm_intc_sc) rid = 0;
sc->intc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (sc->intc_mem_res == NULL) {
device_printf(dev, "could not allocate memory resource\n");
return (ENXIO); return (ENXIO);
}
sc->intc_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); rid = 0;
if (sc->intc_res == NULL) { sc->intc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
device_printf(dev, "could not allocate memory resource\n"); RF_ACTIVE);
if (sc->intc_irq_res == NULL) {
device_printf(dev, "could not alloc interrupt resource\n");
bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->intc_mem_res);
return (ENXIO); return (ENXIO);
} }
sc->intc_bst = rman_get_bustag(sc->intc_res); sc->intc_bst = rman_get_bustag(sc->intc_mem_res);
sc->intc_bsh = rman_get_bushandle(sc->intc_res); sc->intc_bsh = rman_get_bushandle(sc->intc_mem_res);
bcm_intc_sc = sc;
return (0); if (bus_setup_intr(dev, sc->intc_irq_res,
INTR_TYPE_MISC | INTR_CONTROLLER, bcm_intc_intr, NULL, sc,
&sc->intc_intrhand)) {
device_printf(dev, "could not setup interrupt handler\n");
bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->intc_mem_res);
bus_release_resource(dev, SYS_RES_IRQ, 0, sc->intc_irq_res);
return (ENXIO);
} }
static device_method_t bcm_intc_methods[] = { arm_register_pic(dev, 0);
DEVMETHOD(device_probe, bcm_intc_probe),
DEVMETHOD(device_attach, bcm_intc_attach),
{ 0, 0 }
};
static driver_t bcm_intc_driver = { return (0);
"intc", }
bcm_intc_methods,
sizeof(struct bcm_intc_softc),
};
static devclass_t bcm_intc_devclass; static int
bcm_intc_intr(void *arg)
DRIVER_MODULE(intc, simplebus, bcm_intc_driver, bcm_intc_devclass, 0, 0);
int
arm_get_next_irq(int last_irq)
{ {
struct bcm_intc_softc *sc = (struct bcm_intc_softc *)arg;
uint32_t pending; uint32_t pending;
int32_t irq = last_irq + 1; int32_t irq = 0;
/* Sanity check */
if (irq < 0)
irq = 0;
/* TODO: should we mask last_irq? */ /* TODO: should we mask last_irq? */
if (irq < BANK1_START) { pending = intc_read_4(sc, INTC_PENDING_BASIC);
pending = intc_read_4(INTC_PENDING_BASIC); while (irq < BANK1_START) {
if ((pending & 0xFF) == 0) {
irq = BANK1_START; /* skip to next bank */
} else do {
if (pending & (1 << irq)) if (pending & (1 << irq))
return irq; arm_dispatch_irq(sc->sc_dev, NULL, irq);
irq++; irq++;
} while (irq < BANK1_START);
} }
if (irq < BANK2_START) {
pending = intc_read_4(INTC_PENDING_BANK1); pending = intc_read_4(sc, INTC_PENDING_BANK1);
if (pending == 0) { while (irq < BANK2_START) {
irq = BANK2_START; /* skip to next bank */
} else do {
if (pending & (1 << IRQ_BANK1(irq))) if (pending & (1 << IRQ_BANK1(irq)))
return irq; arm_dispatch_irq(sc->sc_dev, NULL, irq);
irq++; irq++;
} while (irq < BANK2_START);
} }
if (irq < BANK3_START) {
pending = intc_read_4(INTC_PENDING_BANK2); pending = intc_read_4(sc, INTC_PENDING_BANK2);
if (pending != 0) do { while (irq <= BANK2_END) {
if (pending & (1 << IRQ_BANK2(irq))) if (pending & (1 << IRQ_BANK2(irq)))
return irq; arm_dispatch_irq(sc->sc_dev, NULL, irq);
irq++; irq++;
} while (irq < BANK3_START);
} }
return (-1);
return (FILTER_HANDLED);
} }
void static int
arm_mask_irq(uintptr_t nb) bcm_intc_config(device_t dev, int irq, enum intr_trigger trig,
enum intr_polarity pol)
{ {
/* no-op */
return (0);
}
static void
bcm_intc_mask(device_t dev, int nb)
{
struct bcm_intc_softc *sc = device_get_softc(dev);
dprintf("%s: %d\n", __func__, nb); dprintf("%s: %d\n", __func__, nb);
if (IS_IRQ_BASIC(nb)) if (IS_IRQ_BASIC(nb))
intc_write_4(INTC_DISABLE_BASIC, (1 << nb)); intc_write_4(sc, INTC_DISABLE_BASIC, (1 << nb));
else if (IS_IRQ_BANK1(nb)) else if (IS_IRQ_BANK1(nb))
intc_write_4(INTC_DISABLE_BANK1, (1 << IRQ_BANK1(nb))); intc_write_4(sc, INTC_DISABLE_BANK1, (1 << IRQ_BANK1(nb)));
else if (IS_IRQ_BANK2(nb)) else if (IS_IRQ_BANK2(nb))
intc_write_4(INTC_DISABLE_BANK2, (1 << IRQ_BANK2(nb))); intc_write_4(sc, INTC_DISABLE_BANK2, (1 << IRQ_BANK2(nb)));
else else
printf("arm_mask_irq: Invalid IRQ number: %d\n", nb); printf("arm_mask_irq: Invalid IRQ number: %d\n", nb);
} }
void static void
arm_unmask_irq(uintptr_t nb) bcm_intc_unmask(device_t dev, int nb)
{ {
struct bcm_intc_softc *sc = device_get_softc(dev);
dprintf("%s: %d\n", __func__, nb); dprintf("%s: %d\n", __func__, nb);
if (IS_IRQ_BASIC(nb)) if (IS_IRQ_BASIC(nb))
intc_write_4(INTC_ENABLE_BASIC, (1 << nb)); intc_write_4(sc, INTC_ENABLE_BASIC, (1 << nb));
else if (IS_IRQ_BANK1(nb)) else if (IS_IRQ_BANK1(nb))
intc_write_4(INTC_ENABLE_BANK1, (1 << IRQ_BANK1(nb))); intc_write_4(sc, INTC_ENABLE_BANK1, (1 << IRQ_BANK1(nb)));
else if (IS_IRQ_BANK2(nb)) else if (IS_IRQ_BANK2(nb))
intc_write_4(INTC_ENABLE_BANK2, (1 << IRQ_BANK2(nb))); intc_write_4(sc, INTC_ENABLE_BANK2, (1 << IRQ_BANK2(nb)));
else else
printf("arm_mask_irq: Invalid IRQ number: %d\n", nb); printf("arm_mask_irq: Invalid IRQ number: %d\n", nb);
} }
static device_method_t bcm_intc_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, bcm_intc_probe),
DEVMETHOD(device_attach, bcm_intc_attach),
/* Interrupt controller interface */
DEVMETHOD(pic_config, bcm_intc_config),
DEVMETHOD(pic_mask, bcm_intc_mask),
DEVMETHOD(pic_unmask, bcm_intc_unmask),
{ 0, 0 }
};
static driver_t bcm_intc_driver = {
"intc",
bcm_intc_methods,
sizeof(struct bcm_intc_softc),
};
static devclass_t bcm_intc_devclass;
DRIVER_MODULE(intc, simplebus, bcm_intc_driver, bcm_intc_devclass, 0, 0);