[src/trunk]: src/sys/arch/arm/fdt fdt glue for gic

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/be0bddcb220b
branches:  trunk
changeset: 812381:be0bddcb220b
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sun Dec 13 17:45:37 2015 +0000

description:
fdt glue for gic

diffstat:

 sys/arch/arm/fdt/files.fdt |    5 +
 sys/arch/arm/fdt/gic_fdt.c |  202 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 207 insertions(+), 0 deletions(-)

diffs (215 lines):

diff -r e9854a4ed28d -r be0bddcb220b sys/arch/arm/fdt/files.fdt
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/fdt/files.fdt        Sun Dec 13 17:45:37 2015 +0000
@@ -0,0 +1,5 @@
+# $NetBSD: files.fdt,v 1.1 2015/12/13 17:45:37 jmcneill Exp $
+
+device  gic
+attach  gic at fdt with gic_fdt
+file    arch/arm/fdt/gic_fdt.c                 gic_fdt
diff -r e9854a4ed28d -r be0bddcb220b sys/arch/arm/fdt/gic_fdt.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/fdt/gic_fdt.c        Sun Dec 13 17:45:37 2015 +0000
@@ -0,0 +1,202 @@
+/* $NetBSD: gic_fdt.c,v 1.1 2015/12/13 17:45:37 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2015 Jared D. McNeill <jmcneill%invisible.ca@localhost>
+ * 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 ``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 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>
+__KERNEL_RCSID(0, "$NetBSD: gic_fdt.c,v 1.1 2015/12/13 17:45:37 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/device.h>
+#include <sys/intr.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/kmem.h>
+
+#include <arm/cortex/gic_intr.h>
+
+#include <dev/fdt/fdtvar.h>
+
+static int     gic_fdt_match(device_t, cfdata_t, void *);
+static void    gic_fdt_attach(device_t, device_t, void *);
+
+static void *  gic_fdt_establish(device_t, int, u_int, int, int,
+                   int (*)(void *), void *);
+static void    gic_fdt_disestablish(device_t, void *);
+static bool    gic_fdt_intrstr(device_t, int, u_int, char *, size_t);
+
+struct fdtbus_interrupt_controller_func gic_fdt_funcs = {
+       .establish = gic_fdt_establish,
+       .disestablish = gic_fdt_disestablish,
+       .intrstr = gic_fdt_intrstr
+};
+
+struct gic_fdt_softc {
+       device_t                sc_dev;
+       int                     sc_phandle;
+};
+
+CFATTACH_DECL_NEW(gic_fdt, sizeof(struct gic_fdt_softc),
+       gic_fdt_match, gic_fdt_attach, NULL, NULL);
+
+static int
+gic_fdt_match(device_t parent, cfdata_t cf, void *aux)
+{
+       const char * const compatible[] = {
+               "arm,gic-400",
+               "arm,cortex-a15-gic",
+               "arm,cortex-a9-gic",
+               "arm,cortex-a7-gic",
+               NULL
+       };
+       struct fdt_attach_args * const faa = aux;
+
+       return of_compatible(faa->faa_phandle, compatible) >= 0;
+}
+
+static void
+gic_fdt_attach(device_t parent, device_t self, void *aux)
+{
+       struct gic_fdt_softc * const sc = device_private(self);
+       struct fdt_attach_args * const faa = aux;
+       int error;
+
+       sc->sc_dev = self;
+       sc->sc_phandle = faa->faa_phandle;
+
+       error = fdtbus_register_interrupt_controller(self, faa->faa_phandle,
+           &gic_fdt_funcs);
+       if (error) {
+               aprint_error(": couldn't register with fdtbus: %d\n", error);
+               return;
+       }
+
+       aprint_naive("\n");
+       aprint_normal(": GIC\n");
+}
+
+static void *
+gic_fdt_establish(device_t dev, int phandle, u_int index, int ipl, int flags,
+    int (*func)(void *), void *arg)
+{
+       struct gic_fdt_softc * const sc = device_private(dev);
+       int iflags = (flags & FDT_INTR_MPSAFE) ? IST_MPSAFE : 0;
+       u_int *interrupts;
+       int interrupt_cells, len;
+
+       len = OF_getprop(sc->sc_phandle, "#interrupt-cells", &interrupt_cells,
+           sizeof(interrupt_cells));
+       if (len != sizeof(interrupt_cells) || interrupt_cells <= 0)
+               return NULL;
+       interrupt_cells = be32toh(interrupt_cells);
+
+       len = OF_getproplen(phandle, "interrupts");
+       if (len <= 0)
+               return NULL;
+
+       const u_int clen = interrupt_cells * 4;
+       const u_int nintr = len / interrupt_cells;
+
+       if (index >= nintr)
+               return NULL;
+
+       interrupts = kmem_alloc(len, KM_SLEEP);
+
+       if (OF_getprop(phandle, "interrupts", interrupts, len) != len) {
+               kmem_free(interrupts, len);
+               return NULL;
+       }
+
+       /* 1st cell is the interrupt type; 0 is SPI, 1 is PPI */
+       /* 2nd cell is the interrupt number */
+       /* 3rd cell is flags */
+
+       const u_int type = be32toh(interrupts[index * clen + 0]);
+       const u_int intr = be32toh(interrupts[index * clen + 1]);
+       const u_int irq = type == 0 ? IRQ_SPI(intr) : IRQ_PPI(intr);
+       const u_int trig = be32toh(interrupts[index * clen + 2]) & 0xf;
+       const u_int level = (trig & 0x3) ? IST_EDGE : IST_LEVEL;
+
+       kmem_free(interrupts, len);
+
+       return intr_establish(irq, ipl, level | iflags, func, arg);
+}
+
+static void
+gic_fdt_disestablish(device_t dev, void *ih)
+{
+       intr_disestablish(ih);
+}
+
+static bool
+gic_fdt_intrstr(device_t dev, int phandle, u_int index, char *buf,
+    size_t buflen)
+{
+       struct gic_fdt_softc * const sc = device_private(dev);
+       u_int *interrupts;
+       int interrupt_cells, len;
+
+       len = OF_getprop(sc->sc_phandle, "#interrupt-cells", &interrupt_cells,
+           sizeof(interrupt_cells));
+       if (len != sizeof(interrupt_cells) || interrupt_cells <= 0) {
+               return false;
+       }
+       interrupt_cells = be32toh(interrupt_cells);
+
+       len = OF_getproplen(phandle, "interrupts");
+       if (len <= 0) {
+               return false;
+       }
+
+       const u_int clen = interrupt_cells * 4;
+       const u_int nintr = len / interrupt_cells;
+
+       if (index >= nintr) {
+               return false;
+       }
+
+       interrupts = kmem_alloc(len, KM_SLEEP);
+
+       if (OF_getprop(phandle, "interrupts", interrupts, len) != len) {
+               kmem_free(interrupts, len);
+               return false;
+       }
+
+       /* 1st cell is the interrupt type; 0 is SPI, 1 is PPI */
+       /* 2nd cell is the interrupt number */
+       /* 3rd cell is flags */
+
+       const u_int type = be32toh(interrupts[index * clen + 0]);
+       const u_int intr = be32toh(interrupts[index * clen + 1]);
+       const u_int irq = type == 0 ? IRQ_SPI(intr) : IRQ_PPI(intr);
+
+       kmem_free(interrupts, len);
+
+       snprintf(buf, buflen, "GIC irq %d", irq);
+
+       return true;
+}