[src/trunk]: src/sys/arch/arm/fdt Add support for message-based interrupts.

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

details:   https://anonhg.NetBSD.org/src/rev/b5b9f9607e79
branches:  trunk
changeset: 978604:b5b9f9607e79
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Wed Nov 25 21:02:35 2020 +0000

description:
Add support for message-based interrupts.

diffstat:

 sys/arch/arm/fdt/gicv3_fdt.c |  70 ++++++++++++++++++++++++++++++++++++++-----
 1 files changed, 62 insertions(+), 8 deletions(-)

diffs (112 lines):

diff -r e570a4a3121d -r b5b9f9607e79 sys/arch/arm/fdt/gicv3_fdt.c
--- a/sys/arch/arm/fdt/gicv3_fdt.c      Wed Nov 25 20:59:20 2020 +0000
+++ b/sys/arch/arm/fdt/gicv3_fdt.c      Wed Nov 25 21:02:35 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: gicv3_fdt.c,v 1.9 2020/11/24 23:31:55 jmcneill Exp $ */
+/* $NetBSD: gicv3_fdt.c,v 1.10 2020/11/25 21:02:35 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2015-2018 Jared McNeill <jmcneill%invisible.ca@localhost>
@@ -31,7 +31,7 @@
 #define        _INTR_PRIVATE
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: gicv3_fdt.c,v 1.9 2020/11/24 23:31:55 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: gicv3_fdt.c,v 1.10 2020/11/25 21:02:35 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -48,6 +48,7 @@
 #include <arm/cortex/gicv3.h>
 #include <arm/cortex/gicv3_its.h>
 #include <arm/cortex/gic_reg.h>
+#include <arm/cortex/gic_v2m.h>
 
 #define        GICV3_MAXIRQ    1020
 
@@ -62,6 +63,7 @@
 
 static int     gicv3_fdt_map_registers(struct gicv3_fdt_softc *);
 #if NPCI > 0 && defined(__HAVE_PCI_MSI_MSIX)
+static void    gicv3_fdt_attach_mbi(struct gicv3_fdt_softc *);
 static void    gicv3_fdt_attach_its(struct gicv3_fdt_softc *, bus_space_tag_t, int);
 #endif
 
@@ -176,12 +178,18 @@
        }
 
 #if NPCI > 0 && defined(__HAVE_PCI_MSI_MSIX)
-       for (int child = OF_child(phandle); child; child = OF_peer(child)) {
-               if (!fdtbus_status_okay(child))
-                       continue;
-               const char * const its_compat[] = { "arm,gic-v3-its", NULL };
-               if (of_match_compatible(child, its_compat))
-                       gicv3_fdt_attach_its(sc, faa->faa_bst, child);
+       if (of_hasprop(phandle, "msi-controller")) {
+               /* Message Based Interrupts */
+               gicv3_fdt_attach_mbi(sc);
+       } else {
+               /* Interrupt Translation Services */
+               for (int child = OF_child(phandle); child; child = OF_peer(child)) {
+                       if (!fdtbus_status_okay(child))
+                               continue;
+                       const char * const its_compat[] = { "arm,gic-v3-its", NULL };
+                       if (of_match_compatible(child, its_compat))
+                               gicv3_fdt_attach_its(sc, faa->faa_bst, child);
+               }
        }
 #endif
 
@@ -257,6 +265,52 @@
 
 #if NPCI > 0 && defined(__HAVE_PCI_MSI_MSIX)
 static void
+gicv3_fdt_attach_mbi(struct gicv3_fdt_softc *sc)
+{
+       struct gic_v2m_frame *frame;
+       const u_int *ranges;
+       bus_addr_t addr;
+       int len, frame_count;
+
+       if (of_hasprop(sc->sc_phandle, "mbi-alias")) {
+               aprint_error_dev(sc->sc_gic.sc_dev, "'mbi-alias' property not supported\n");
+               return;
+       }
+
+       if (fdtbus_get_reg(sc->sc_phandle, 0, &addr, NULL) != 0)
+               return;
+
+       ranges = fdtbus_get_prop(sc->sc_phandle, "mbi-ranges", &len);
+       if (ranges == NULL) {
+               aprint_error_dev(sc->sc_gic.sc_dev, "missing 'mbi-ranges' property\n");
+               return;
+       }
+
+       frame_count = 0;
+       while (len >= 8) {
+               const u_int base_spi = be32dec(&ranges[0]);
+               const u_int num_spis = be32dec(&ranges[1]);
+
+               frame = kmem_zalloc(sizeof(*frame), KM_SLEEP);
+               frame->frame_reg = addr;
+               frame->frame_pic = pic_list[0];
+               frame->frame_base = base_spi;
+               frame->frame_count = num_spis;
+
+               if (gic_v2m_init(frame, sc->sc_gic.sc_dev, frame_count++) != 0) {
+                       aprint_error_dev(sc->sc_gic.sc_dev, "failed to initialize MBI frame\n");
+               } else {
+                       aprint_normal_dev(sc->sc_gic.sc_dev, "MBI frame @ %#" PRIx64
+                           ", SPIs %u-%u\n", frame->frame_reg,
+                           frame->frame_base, frame->frame_base + frame->frame_count - 1);
+               }
+
+               ranges += 2;
+               len -= 8;
+       }
+}
+
+static void
 gicv3_fdt_attach_its(struct gicv3_fdt_softc *sc, bus_space_tag_t bst, int phandle)
 {
        bus_space_handle_t bsh;