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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/hexagon/kernel/irq_cpu.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/hexagon/kernel/irq_cpu.c')
-rw-r--r--arch/hexagon/kernel/irq_cpu.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/hexagon/kernel/irq_cpu.c b/arch/hexagon/kernel/irq_cpu.c
new file mode 100644
index 0000000000..9c92f2fc7e
--- /dev/null
+++ b/arch/hexagon/kernel/irq_cpu.c
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+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * First-level interrupt controller model for Hexagon.
+ *
+ * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/interrupt.h>
+#include <asm/irq.h>
+#include <asm/hexagon_vm.h>
+
+static void mask_irq(struct irq_data *data)
+{
+ __vmintop_locdis((long) data->irq);
+}
+
+static void mask_irq_num(unsigned int irq)
+{
+ __vmintop_locdis((long) irq);
+}
+
+static void unmask_irq(struct irq_data *data)
+{
+ __vmintop_locen((long) data->irq);
+}
+
+/* This is actually all we need for handle_fasteoi_irq */
+static void eoi_irq(struct irq_data *data)
+{
+ __vmintop_globen((long) data->irq);
+}
+
+/* Power mamangement wake call. We don't need this, however,
+ * if this is absent, then an -ENXIO error is returned to the
+ * msm_serial driver, and it fails to correctly initialize.
+ * This is a bug in the msm_serial driver, but, for now, we
+ * work around it here, by providing this bogus handler.
+ * XXX FIXME!!! remove this when msm_serial is fixed.
+ */
+static int set_wake(struct irq_data *data, unsigned int on)
+{
+ return 0;
+}
+
+static struct irq_chip hexagon_irq_chip = {
+ .name = "HEXAGON",
+ .irq_mask = mask_irq,
+ .irq_unmask = unmask_irq,
+ .irq_set_wake = set_wake,
+ .irq_eoi = eoi_irq
+};
+
+/**
+ * The hexagon core comes with a first-level interrupt controller
+ * with 32 total possible interrupts. When the core is embedded
+ * into different systems/platforms, it is typically wrapped by
+ * macro cells that provide one or more second-level interrupt
+ * controllers that are cascaded into one or more of the first-level
+ * interrupts handled here. The precise wiring of these other
+ * irqs varies from platform to platform, and are set up & configured
+ * in the platform-specific files.
+ *
+ * The first-level interrupt controller is wrapped by the VM, which
+ * virtualizes the interrupt controller for us. It provides a very
+ * simple, fast & efficient API, and so the fasteoi handler is
+ * appropriate for this case.
+ */
+void __init init_IRQ(void)
+{
+ int irq;
+
+ for (irq = 0; irq < HEXAGON_CPUINTS; irq++) {
+ mask_irq_num(irq);
+ irq_set_chip_and_handler(irq, &hexagon_irq_chip,
+ handle_fasteoi_irq);
+ }
+}