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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Minios-devel] [UNIKRAFT PATCHv2 4/8] lib/fdt: Add a fdt_interrupr_cells helper to parse irq
From: Wei Chen <wei.chen@xxxxxxx>
We will use this helper to parse IRQ number for devices, like
timers and UARTs.
Jira: ENTOS-860
Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
Signed-off-by: Jia He <justin.he@xxxxxxx>
---
lib/fdt/Makefile.uk | 1 +
lib/fdt/exportsyms.uk | 1 +
lib/fdt/fdt_interrupts.c | 89 ++++++++++++++++++++++++++++++++++++++++
lib/fdt/include/libfdt.h | 19 +++++++++
4 files changed, 110 insertions(+)
create mode 100644 lib/fdt/fdt_interrupts.c
diff --git a/lib/fdt/Makefile.uk b/lib/fdt/Makefile.uk
index 03251f6..0ba9cec 100644
--- a/lib/fdt/Makefile.uk
+++ b/lib/fdt/Makefile.uk
@@ -7,6 +7,7 @@ LIBFDT_CFLAGS-y += -Wno-sign-compare
LIBFDT_SRCS-y += $(LIBFDT_BASE)/fdt.c
LIBFDT_SRCS-y += $(LIBFDT_BASE)/fdt_addresses.c
+LIBFDT_SRCS-y += $(LIBFDT_BASE)/fdt_interrupts.c
LIBFDT_SRCS-y += $(LIBFDT_BASE)/fdt_empty_tree.c
LIBFDT_SRCS-y += $(LIBFDT_BASE)/fdt_overlay.c
LIBFDT_SRCS-y += $(LIBFDT_BASE)/fdt_ro.c
diff --git a/lib/fdt/exportsyms.uk b/lib/fdt/exportsyms.uk
index d64d9dc..b11df90 100644
--- a/lib/fdt/exportsyms.uk
+++ b/lib/fdt/exportsyms.uk
@@ -61,3 +61,4 @@ fdt_stringlist_contains
fdt_resize
fdt_overlay_apply
fdt_getprop_u32_by_offset
+fdt_interrupt_cells
diff --git a/lib/fdt/fdt_interrupts.c b/lib/fdt/fdt_interrupts.c
new file mode 100644
index 0000000..45ae963
--- /dev/null
+++ b/lib/fdt/fdt_interrupts.c
@@ -0,0 +1,89 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2014 David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
+ * Copyright (C) 2018 Arm Ltd,. <Wei.Chen@xxxxxxx>
+ *
+ * libfdt is dual licensed: you can use it either under the terms of
+ * the GPL, or the BSD license, at your option.
+ *
+ * a) This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ *
+ * Alternatively,
+ *
+ * b) 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 "libfdt_env.h"
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_internal.h"
+
+int fdt_find_irq_parent_offset(const void *fdt, int offset)
+{
+ uint32_t irq_parent;
+
+ do {
+ /* Find the interrupt-parent phandle */
+ if (!fdt_getprop_u32_by_offset(fdt, offset,
+ "interrupt-parent", &irq_parent))
+ break;
+
+ /* Try to find in parent node */
+ offset = fdt_parent_offset(fdt, offset);
+ } while (offset >= 0);
+
+ if (offset < 0)
+ return offset;
+
+ /* Get interrupt parent node by phandle */
+ return fdt_node_offset_by_phandle(fdt, irq_parent);
+}
+
+int fdt_interrupt_cells(const void *fdt, int offset)
+{
+ int intc_offset;
+
+ intc_offset = fdt_find_irq_parent_offset(fdt, offset);
+ if (intc_offset < 0)
+ return intc_offset;
+
+ return fdt_get_cells(fdt, "#interrupt-cells", intc_offset);
+}
diff --git a/lib/fdt/include/libfdt.h b/lib/fdt/include/libfdt.h
index 798a57a..b0815af 100644
--- a/lib/fdt/include/libfdt.h
+++ b/lib/fdt/include/libfdt.h
@@ -1141,6 +1141,25 @@ int fdt_address_cells(const void *fdt, int nodeoffset);
*/
int fdt_size_cells(const void *fdt, int nodeoffset);
+/**
+ * fdt_interrupt_cells - retrieve the number of cells needed to encode an
+ * interrupt source
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node to find the interrupt for.
+ *
+ * When the node has a valid #interrupt-cells property, returns its value.
+ *
+ * returns:
+ * 0 <= n < FDT_MAX_NCELLS, on success
+ * -FDT_ERR_BADNCELLS, if the node has a badly formatted or invalid
+ * #interrupt-cells property
+ * -FDT_ERR_BADMAGIC,
+ * -FDT_ERR_BADVERSION,
+ * -FDT_ERR_BADSTATE,
+ * -FDT_ERR_BADSTRUCTURE,
+ * -FDT_ERR_TRUNCATED, standard meanings
+ */
+int fdt_interrupt_cells(const void *fdt, int nodeoffset);
/**********************************************************************/
/* Write-in-place functions */
--
2.17.1
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