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/*-
* Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@bluezbox.com>
* All rights reserved.
*
* 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 DEBUG
#define dprintf(fmt, args...) printf(fmt, ##args)
#else
#define dprintf(fmt, args...)
#endif
#define VICIRQSTATUS 0x000
#define VICFIQSTATUS 0x004
#define VICRAWINTR 0x008
#define VICINTSELECT 0x00C
#define VICINTENABLE 0x010
#define VICINTENCLEAR 0x014
#define VICSOFTINT 0x018
#define VICSOFTINTCLEAR 0x01C
#define VICPROTECTION 0x020
#define VICPERIPHID 0xFE0
#define VICPRIMECELLID 0xFF0
#define VIC_NIRQS 32
struct pl190_intc_softc {
device_t sc_dev;
struct resource * intc_res;
};
static struct pl190_intc_softc *pl190_intc_sc = NULL;
#define intc_vic_read_4(reg) \
bus_read_4(pl190_intc_sc->intc_res, (reg))
#define intc_vic_write_4(reg, val) \
bus_write_4(pl190_intc_sc->intc_res, (reg), (val))
static int
pl190_intc_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "arm,versatile-vic"))
return (ENXIO);
device_set_desc(dev, "ARM PL190 VIC");
return (BUS_PROBE_DEFAULT);
}
static int
pl190_intc_attach(device_t dev)
{
struct pl190_intc_softc *sc = device_get_softc(dev);
uint32_t id;
int i, rid;
sc->sc_dev = dev;
if (pl190_intc_sc)
return (ENXIO);
/* Request memory resources */
rid = 0;
sc->intc_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (sc->intc_res == NULL) {
device_printf(dev, "Error: could not allocate memory resources\n");
return (ENXIO);
}
pl190_intc_sc = sc;
/*
* All interrupts should use IRQ line
*/
intc_vic_write_4(VICINTSELECT, 0x00000000);
/* Disable all interrupts */
intc_vic_write_4(VICINTENCLEAR, 0xffffffff);
/* Enable INT31, SIC IRQ */
intc_vic_write_4(VICINTENABLE, (1U << 31));
id = 0;
for (i = 3; i >= 0; i--) {
id = (id << 8) |
(intc_vic_read_4(VICPERIPHID + i*4) & 0xff);
}
device_printf(dev, "Peripheral ID: %08x\n", id);
id = 0;
for (i = 3; i >= 0; i--) {
id = (id << 8) |
(intc_vic_read_4(VICPRIMECELLID + i*4) & 0xff);
}
device_printf(dev, "PrimeCell ID: %08x\n", id);
return (0);
}
static device_method_t pl190_intc_methods[] = {
DEVMETHOD(device_probe, pl190_intc_probe),
DEVMETHOD(device_attach, pl190_intc_attach),
{ 0, 0 }
};
static driver_t pl190_intc_driver = {
"intc",
pl190_intc_methods,
sizeof(struct pl190_intc_softc),
};
static devclass_t pl190_intc_devclass;
EARLY_DRIVER_MODULE(intc, simplebus, pl190_intc_driver, pl190_intc_devclass,
0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
int
arm_get_next_irq(int last_irq)
{
uint32_t pending;
int32_t irq = last_irq + 1;
/* Sanity check */
if (irq < 0)
irq = 0;
pending = intc_vic_read_4(VICIRQSTATUS);
while (irq < VIC_NIRQS) {
if (pending & (1 << irq))
return (irq);
irq++;
}
return (-1);
}
void
arm_mask_irq(uintptr_t nb)
{
dprintf("%s: %d\n", __func__, nb);
intc_vic_write_4(VICINTENCLEAR, (1 << nb));
}
void
arm_unmask_irq(uintptr_t nb)
{
dprintf("%s: %d\n", __func__, nb);
intc_vic_write_4(VICINTENABLE, (1 << nb));
}
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