Add driver for PrimeCell Vectored Interrupt Controller (PL190)

1 files changed, 187 insertions, 0 deletions

diff --git a/sys/arm/arm/pl190.c b/sys/arm/arm/pl190.c
new file mode 100644
index 0000000..3e38073
--- /dev/null
+++ b/sys/arm/arm/pl190.c
@@ -0,0 +1,187 @@
+/*-
+ * 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_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, (1 << 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;
+
+DRIVER_MODULE(intc, simplebus, pl190_intc_driver, pl190_intc_devclass, 0, 0);
+
+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));
+}