[ARM] tegra: syncpt: Move syncpt handling to syncpt.c

Change-Id: I8ee2cde45d424e74465f62d1c2185291c30ac982
Signed-off-by: Colin Cross <ccross@google.com>

2 files changed, 101 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 985c36865dde..b6fc6db88a4c 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -1,6 +1,7 @@
 obj-y                                   += common.o
 obj-y                                   += io.o
 obj-y                                   += irq.o legacy_irq.o
+obj-y					+= syncpt.o
 obj-y                                   += clock.o
 obj-y                                   += timer.o
 obj-y                                   += gpio.o
diff --git a/arch/arm/mach-tegra/syncpt.c b/arch/arm/mach-tegra/syncpt.c
new file mode 100644
index 000000000000..bb649a9fe51a
--- /dev/null
+++ b/arch/arm/mach-tegra/syncpt.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2010 Google, Inc.
+ *
+ * Author:
+ *	Erik Gilling <konkers@google.com>
+ *
+ * Copyright (C) 2010, NVIDIA Corporation
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <mach/iomap.h>
+#include <mach/irqs.h>
+
+#define HOST1X_SYNC_OFFSET 0x3000
+#define HOST1X_SYNC_SIZE 0x800
+enum {
+	HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS = 0x40,
+	HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE = 0x60
+};
+
+static void syncpt_thresh_mask(unsigned int irq)
+{
+	(void)irq;
+}
+
+static void syncpt_thresh_unmask(unsigned int irq)
+{
+	(void)irq;
+}
+
+static void syncpt_thresh_cascade(unsigned int irq, struct irq_desc *desc)
+{
+	void __iomem *sync_regs = get_irq_desc_data(desc);
+	u32 reg;
+	int id;
+
+	desc->chip->ack(irq);
+
+	reg = readl(sync_regs + HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS);
+
+	while ((id = __fls(reg)) >= 0) {
+		reg ^= BIT(id);
+		generic_handle_irq(id + INT_SYNCPT_THRESH_BASE);
+	}
+
+	desc->chip->unmask(irq);
+}
+
+static struct irq_chip syncpt_thresh_irq = {
+	.name		= "syncpt",
+	.mask		= syncpt_thresh_mask,
+	.unmask		= syncpt_thresh_unmask
+};
+
+static int __init syncpt_init_irq(void)
+{
+	void __iomem *sync_regs;
+	unsigned int i;
+	int irq;
+
+	sync_regs = ioremap(TEGRA_HOST1X_BASE + HOST1X_SYNC_OFFSET,
+			HOST1X_SYNC_SIZE);
+	BUG_ON(!sync_regs);
+
+	writel(0xffffffffUL,
+		sync_regs + HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE);
+	writel(0xffffffffUL,
+		sync_regs + HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS);
+
+	for (i = 0; i < INT_SYNCPT_THRESH_NR; i++) {
+		irq = INT_SYNCPT_THRESH_BASE + i;
+		set_irq_chip(irq, &syncpt_thresh_irq);
+		set_irq_chip_data(irq, sync_regs);
+		set_irq_handler(irq, handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+	if (set_irq_data(INT_HOST1X_MPCORE_SYNCPT, sync_regs))
+		BUG();
+	set_irq_chained_handler(INT_HOST1X_MPCORE_SYNCPT,
+				syncpt_thresh_cascade);
+
+	return 0;
+}
+
+core_initcall(syncpt_init_irq);