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authorColin Cross <ccross@android.com>2010-04-05 15:22:21 -0700
committerColin Cross <ccross@android.com>2010-10-21 18:11:29 -0700
commit8726e4f50e3f445601c19a851c62586f5dc7dd49 (patch)
treebbdd1aa4aab77d945da27568b9f78927c7c5317f
parentc231d6976a161ae7b5b3aba4a1821b2e9c00c02c (diff)
downloadop-kernel-dev-8726e4f50e3f445601c19a851c62586f5dc7dd49.zip
op-kernel-dev-8726e4f50e3f445601c19a851c62586f5dc7dd49.tar.gz
[ARM] tegra: Add legacy irq support
The "legacy irq controller" duplicates the functionality of the GIC, but remains powered during the cpu suspend and idle modes that power down the CPU and the GIC. Signed-off-by: Colin Cross <ccross@android.com>
-rw-r--r--arch/arm/mach-tegra/Makefile2
-rw-r--r--arch/arm/mach-tegra/include/mach/legacy_irq.h31
-rw-r--r--arch/arm/mach-tegra/legacy_irq.c114
3 files changed, 146 insertions, 1 deletions
diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 51e9370..0a975b5 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -1,6 +1,6 @@
obj-y += common.o
obj-y += io.o
-obj-y += irq.o
+obj-y += irq.o legacy_irq.o
obj-y += clock.o
obj-y += timer.o
obj-y += gpio.o
diff --git a/arch/arm/mach-tegra/include/mach/legacy_irq.h b/arch/arm/mach-tegra/include/mach/legacy_irq.h
new file mode 100644
index 0000000..db1eb3d
--- /dev/null
+++ b/arch/arm/mach-tegra/include/mach/legacy_irq.h
@@ -0,0 +1,31 @@
+/*
+ * arch/arm/mach-tegra/include/mach/legacy_irq.h
+ *
+ * Copyright (C) 2010 Google, Inc.
+ * Author: Colin Cross <ccross@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program 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.
+ *
+ */
+
+#ifndef _ARCH_ARM_MACH_TEGRA_LEGARY_IRQ_H
+#define _ARCH_ARM_MACH_TEGRA_LEGARY_IRQ_H
+
+void tegra_legacy_mask_irq(unsigned int irq);
+void tegra_legacy_unmask_irq(unsigned int irq);
+void tegra_legacy_select_fiq(unsigned int irq, bool fiq);
+void tegra_legacy_force_irq_set(unsigned int irq);
+void tegra_legacy_force_irq_clr(unsigned int irq);
+int tegra_legacy_force_irq_status(unsigned int irq);
+void tegra_legacy_select_fiq(unsigned int irq, bool fiq);
+unsigned long tegra_legacy_vfiq(int nr);
+unsigned long tegra_legacy_class(int nr);
+
+#endif
diff --git a/arch/arm/mach-tegra/legacy_irq.c b/arch/arm/mach-tegra/legacy_irq.c
new file mode 100644
index 0000000..7cc8601
--- /dev/null
+++ b/arch/arm/mach-tegra/legacy_irq.c
@@ -0,0 +1,114 @@
+/*
+ * arch/arm/mach-tegra/legacy_irq.c
+ *
+ * Copyright (C) 2010 Google, Inc.
+ * Author: Colin Cross <ccross@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program 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.
+ *
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <mach/iomap.h>
+#include <mach/legacy_irq.h>
+
+#define ICTLR_CPU_IER 0x20
+#define ICTLR_CPU_IER_SET 0x24
+#define ICTLR_CPU_IER_CLR 0x28
+#define ICTLR_CPU_IEP_CLASS 0x2C
+#define ICTLR_CPU_IEP_VFIQ 0x08
+#define ICTLR_CPU_IEP_FIR 0x14
+#define ICTLR_CPU_IEP_FIR_SET 0x18
+#define ICTLR_CPU_IEP_FIR_CLR 0x1c
+
+static void __iomem *ictlr_reg_base[] = {
+ IO_ADDRESS(TEGRA_PRIMARY_ICTLR_BASE),
+ IO_ADDRESS(TEGRA_SECONDARY_ICTLR_BASE),
+ IO_ADDRESS(TEGRA_TERTIARY_ICTLR_BASE),
+ IO_ADDRESS(TEGRA_QUATERNARY_ICTLR_BASE),
+};
+
+/* When going into deep sleep, the CPU is powered down, taking the GIC with it
+ In order to wake, the wake interrupts need to be enabled in the legacy
+ interrupt controller. */
+void tegra_legacy_unmask_irq(unsigned int irq)
+{
+ void __iomem *base;
+ pr_debug("%s: %d\n", __func__, irq);
+
+ irq -= 32;
+ base = ictlr_reg_base[irq>>5];
+ writel(1 << (irq & 31), base + ICTLR_CPU_IER_SET);
+}
+
+void tegra_legacy_mask_irq(unsigned int irq)
+{
+ void __iomem *base;
+ pr_debug("%s: %d\n", __func__, irq);
+
+ irq -= 32;
+ base = ictlr_reg_base[irq>>5];
+ writel(1 << (irq & 31), base + ICTLR_CPU_IER_CLR);
+}
+
+void tegra_legacy_force_irq_set(unsigned int irq)
+{
+ void __iomem *base;
+ pr_debug("%s: %d\n", __func__, irq);
+
+ irq -= 32;
+ base = ictlr_reg_base[irq>>5];
+ writel(1 << (irq & 31), base + ICTLR_CPU_IEP_FIR_SET);
+}
+
+void tegra_legacy_force_irq_clr(unsigned int irq)
+{
+ void __iomem *base;
+ pr_debug("%s: %d\n", __func__, irq);
+
+ irq -= 32;
+ base = ictlr_reg_base[irq>>5];
+ writel(1 << (irq & 31), base + ICTLR_CPU_IEP_FIR_CLR);
+}
+
+int tegra_legacy_force_irq_status(unsigned int irq)
+{
+ void __iomem *base;
+ pr_debug("%s: %d\n", __func__, irq);
+
+ irq -= 32;
+ base = ictlr_reg_base[irq>>5];
+ return !!(readl(base + ICTLR_CPU_IEP_FIR) & (1 << (irq & 31)));
+}
+
+void tegra_legacy_select_fiq(unsigned int irq, bool fiq)
+{
+ void __iomem *base;
+ pr_debug("%s: %d\n", __func__, irq);
+
+ irq -= 32;
+ base = ictlr_reg_base[irq>>5];
+ writel(fiq << (irq & 31), base + ICTLR_CPU_IEP_CLASS);
+}
+
+unsigned long tegra_legacy_vfiq(int nr)
+{
+ void __iomem *base;
+ base = ictlr_reg_base[nr];
+ return readl(base + ICTLR_CPU_IEP_VFIQ);
+}
+
+unsigned long tegra_legacy_class(int nr)
+{
+ void __iomem *base;
+ base = ictlr_reg_base[nr];
+ return readl(base + ICTLR_CPU_IEP_CLASS);
+}
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