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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Minios-devel] [UNIKRAFT PATCHv10 2/7] plat/common: Introduce fdt_interrupt_cells helper to parse irq
From: Jianyong Wu <jianyong.wu@xxxxxxx>
This helper retrieves the number of cells by scan "#interrupt-cells"
property of fdt.
We will use this helper to parse IRQ number for devices, like
timers and UARTs.
This also enable the build support for unikraft internal fdt interfaces.
Reviewed-by: Sharan Santhanam <sharan.santhanam@xxxxxxxxx>
Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
Signed-off-by: Jia He <justin.he@xxxxxxx>
---
plat/drivers/include/ofw/fdt.h | 58 ++++++++++++++++++++++++
plat/drivers/ofw/fdt.c | 82 ++++++++++++++++++++++++++++++++++
plat/kvm/Makefile.uk | 2 +
3 files changed, 142 insertions(+)
create mode 100644 plat/drivers/include/ofw/fdt.h
create mode 100644 plat/drivers/ofw/fdt.c
diff --git a/plat/drivers/include/ofw/fdt.h b/plat/drivers/include/ofw/fdt.h
new file mode 100644
index 0000000..290abd5
--- /dev/null
+++ b/plat/drivers/include/ofw/fdt.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Wei Chen <Wei.Chen@xxxxxxx>
+ * Jianyong Wu <Jianyong.Wu@xxxxxxx>
+ *
+ * Copyright (c) 2018, Arm Ltd. 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.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * 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 HOLDER 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.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+#ifndef _PLAT_DRIVER_OFW_FDT_H
+#define _PLAT_DRIVER_OFW_FDT_H
+
+/**
+ * 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);
+
+#endif
diff --git a/plat/drivers/ofw/fdt.c b/plat/drivers/ofw/fdt.c
new file mode 100644
index 0000000..73a361f
--- /dev/null
+++ b/plat/drivers/ofw/fdt.c
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Wei Chen <Wei.Chen@xxxxxxx>
+ * Jianyong Wu <Jianyong.Wu@xxxxxxx>
+ *
+ * Copyright (c) 2018, Arm Ltd. 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.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * 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 HOLDER 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.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+#include <libfdt_env.h>
+#include <fdt.h>
+#include <libfdt.h>
+
+#include <uk/print.h>
+#include <uk/assert.h>
+
+static 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;
+ int val;
+ int ret;
+
+ intc_offset = fdt_find_irq_parent_offset(fdt, offset);
+ if (intc_offset < 0)
+ return intc_offset;
+
+ ret = fdt_getprop_u32_by_offset(fdt, intc_offset, "#interrupt-cells",
+ (uint32_t *)&val);
+ if (ret < 0)
+ return ret;
+
+ if ((val <= 0) || (val > FDT_MAX_NCELLS))
+ return -FDT_ERR_BADNCELLS;
+
+ return val;
+}
diff --git a/plat/kvm/Makefile.uk b/plat/kvm/Makefile.uk
index 71c4c41..3c3c006 100644
--- a/plat/kvm/Makefile.uk
+++ b/plat/kvm/Makefile.uk
@@ -18,6 +18,7 @@ LIBKVMPLAT_ASINCLUDES-y += -I$(LIBKVMPLAT_BASE)/include
LIBKVMPLAT_ASINCLUDES-y += -I$(UK_PLAT_COMMON_BASE)/include
LIBKVMPLAT_CINCLUDES-y += -I$(LIBKVMPLAT_BASE)/include
LIBKVMPLAT_CINCLUDES-y += -I$(UK_PLAT_COMMON_BASE)/include
+LIBKVMPLAT_CINCLUDES-y += -I$(UK_PLAT_DRIVERS_BASE)/include
LIBKVMPLAT_ASFLAGS += -DKVMPLAT
LIBKVMPLAT_CFLAGS += -DKVMPLAT
@@ -65,6 +66,7 @@ LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) +=
$(UK_PLAT_COMMON_BASE)/arm/cache64.S|co
LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) +=
$(UK_PLAT_COMMON_BASE)/arm/psci_arm64.S|common
LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) +=
$(UK_PLAT_COMMON_BASE)/arm/time.c|common
LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) +=
$(UK_PLAT_COMMON_BASE)/arm/traps.c|common
+LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) +=
$(UK_PLAT_DRIVERS_BASE)/ofw/fdt.c|common
LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) += $(LIBKVMPLAT_BASE)/arm/entry64.S
LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) += $(LIBKVMPLAT_BASE)/arm/exceptions.S
LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) += $(LIBKVMPLAT_BASE)/arm/pagetable64.S
--
2.17.1
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