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freebsd-dev/sys/arm/broadcom/bcm2835/bcm2835_intr.c
Andrew Turner 4e46a66e4a Add support for the Raspberry Pi 2. As the chip is based on the bcm2835 in 
the Raspberry Pi B we support most of the devices are already supported,
however the base address has changed.

A few items are not working, or missing. The main ones are:
 * DMA doesn't work in the sdhci driver.
 * Enabling vchiq halts the boot, may be interrupt related.
 * There is no U-Boot port yet so the DTB is embedded in the kernel.

The last point will make it difficult to boot FreeBSD, however there is
support for the Raspberry Pi 2 in the U-Boot git repo. As I have not tested
this it is left as an open task to create a port to build.

X-MFC:		When the above issues are fixed
Sponsored by:	ABT Systems Ltd
2015-03-25 10:59:42 +00:00

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/*-
* Copyright (c) 2012 Damjan Marion <dmarion@Freebsd.org>
* All rights reserved.
*
* Based on OMAP3 INTC code by Ben Gray
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#ifdef SOC_BCM2836
#include <arm/broadcom/bcm2835/bcm2836.h>
#endif
#define INTC_PENDING_BASIC 0x00
#define INTC_PENDING_BANK1 0x04
#define INTC_PENDING_BANK2 0x08
#define INTC_FIQ_CONTROL 0x0C
#define INTC_ENABLE_BANK1 0x10
#define INTC_ENABLE_BANK2 0x14
#define INTC_ENABLE_BASIC 0x18
#define INTC_DISABLE_BANK1 0x1C
#define INTC_DISABLE_BANK2 0x20
#define INTC_DISABLE_BASIC 0x24
#define BANK1_START 8
#define BANK1_END (BANK1_START + 32 - 1)
#define BANK2_START (BANK1_START + 32)
#define BANK2_END (BANK2_START + 32 - 1)
#define BANK3_START (BANK2_START + 32)
#define BANK3_END (BANK3_START + 32 - 1)
#define IS_IRQ_BASIC(n) (((n) >= 0) && ((n) < BANK1_START))
#define IS_IRQ_BANK1(n) (((n) >= BANK1_START) && ((n) <= BANK1_END))
#define IS_IRQ_BANK2(n) (((n) >= BANK2_START) && ((n) <= BANK2_END))
#define ID_IRQ_BCM2836(n) (((n) >= BANK3_START) && ((n) <= BANK3_END))
#define IRQ_BANK1(n) ((n) - BANK1_START)
#define IRQ_BANK2(n) ((n) - BANK2_START)
#ifdef DEBUG
#define dprintf(fmt, args...) printf(fmt, ##args)
#else
#define dprintf(fmt, args...)
#endif
struct bcm_intc_softc {
device_t sc_dev;
struct resource * intc_res;
bus_space_tag_t intc_bst;
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))
static int
bcm_intc_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "broadcom,bcm2835-armctrl-ic"))
return (ENXIO);
device_set_desc(dev, "BCM2835 Interrupt Controller");
return (BUS_PROBE_DEFAULT);
}
static int
bcm_intc_attach(device_t dev)
{
struct bcm_intc_softc *sc = device_get_softc(dev);
int rid = 0;
sc->sc_dev = dev;
if (bcm_intc_sc)
return (ENXIO);
sc->intc_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
if (sc->intc_res == NULL) {
device_printf(dev, "could not allocate memory resource\n");
return (ENXIO);
}
sc->intc_bst = rman_get_bustag(sc->intc_res);
sc->intc_bsh = rman_get_bushandle(sc->intc_res);
bcm_intc_sc = sc;
return (0);
}
static device_method_t bcm_intc_methods[] = {
DEVMETHOD(device_probe, bcm_intc_probe),
DEVMETHOD(device_attach, bcm_intc_attach),
{ 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);
int
arm_get_next_irq(int last_irq)
{
struct bcm_intc_softc *sc = bcm_intc_sc;
uint32_t pending;
int32_t irq = last_irq + 1;
#ifdef SOC_BCM2836
int ret;
#endif
/* Sanity check */
if (irq < 0)
irq = 0;
#ifdef SOC_BCM2836
if ((ret = bcm2836_get_next_irq(irq)) >= 0)
return (ret + BANK3_START);
#endif
/* TODO: should we mask last_irq? */
if (irq < BANK1_START) {
pending = intc_read_4(sc, INTC_PENDING_BASIC);
if ((pending & 0xFF) == 0) {
irq = BANK1_START; /* skip to next bank */
} else do {
if (pending & (1 << irq))
return irq;
irq++;
} while (irq < BANK1_START);
}
if (irq < BANK2_START) {
pending = intc_read_4(sc, INTC_PENDING_BANK1);
if (pending == 0) {
irq = BANK2_START; /* skip to next bank */
} else do {
if (pending & (1 << IRQ_BANK1(irq)))
return irq;
irq++;
} while (irq < BANK2_START);
}
if (irq < BANK3_START) {
pending = intc_read_4(sc, INTC_PENDING_BANK2);
if (pending != 0) do {
if (pending & (1 << IRQ_BANK2(irq)))
return irq;
irq++;
} while (irq < BANK3_START);
}
return (-1);
}
void
arm_mask_irq(uintptr_t nb)
{
struct bcm_intc_softc *sc = bcm_intc_sc;
dprintf("%s: %d\n", __func__, nb);
if (IS_IRQ_BASIC(nb))
intc_write_4(sc, INTC_DISABLE_BASIC, (1 << nb));
else if (IS_IRQ_BANK1(nb))
intc_write_4(sc, INTC_DISABLE_BANK1, (1 << IRQ_BANK1(nb)));
else if (IS_IRQ_BANK2(nb))
intc_write_4(sc, INTC_DISABLE_BANK2, (1 << IRQ_BANK2(nb)));
#ifdef SOC_BCM2836
else if (ID_IRQ_BCM2836(nb))
bcm2836_mask_irq(nb - BANK3_START);
#endif
else
printf("arm_mask_irq: Invalid IRQ number: %d\n", nb);
}
void
arm_unmask_irq(uintptr_t nb)
{
struct bcm_intc_softc *sc = bcm_intc_sc;
dprintf("%s: %d\n", __func__, nb);
if (IS_IRQ_BASIC(nb))
intc_write_4(sc, INTC_ENABLE_BASIC, (1 << nb));
else if (IS_IRQ_BANK1(nb))
intc_write_4(sc, INTC_ENABLE_BANK1, (1 << IRQ_BANK1(nb)));
else if (IS_IRQ_BANK2(nb))
intc_write_4(sc, INTC_ENABLE_BANK2, (1 << IRQ_BANK2(nb)));
#ifdef SOC_BCM2836
else if (ID_IRQ_BCM2836(nb))
bcm2836_unmask_irq(nb - BANK3_START);
#endif
else
printf("arm_mask_irq: Invalid IRQ number: %d\n", nb);
}
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