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Subject[RFC][PATCH 01/10] arm: mxc: New interrupt controller (TZIC) for i.MX5 family
Date
Freescale i.MX51 processor uses a different interrupt controller. Add the
driver and fix the Makefile to account for it.

Signed-off-by: Amit Kucheria <amit.kucheria@canonical.com>
---
arch/arm/plat-mxc/Kconfig | 4 +
arch/arm/plat-mxc/Makefile | 9 ++-
arch/arm/plat-mxc/tzic.c | 180 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 192 insertions(+), 1 deletions(-)
create mode 100644 arch/arm/plat-mxc/tzic.c
diff --git a/arch/arm/plat-mxc/Kconfig b/arch/arm/plat-mxc/Kconfig
index ca5c7c2..11bf691 100644
--- a/arch/arm/plat-mxc/Kconfig
+++ b/arch/arm/plat-mxc/Kconfig
@@ -75,4 +75,8 @@ config ARCH_HAS_RNGA

config ARCH_MXC_IOMUX_V3
bool
+
+config MXC_TZIC
+ bool
+ depends on ARCH_MXC
endif
diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile
index e3212c8..5be53ca 100644
--- a/arch/arm/plat-mxc/Makefile
+++ b/arch/arm/plat-mxc/Makefile
@@ -3,7 +3,14 @@
#

# Common support
-obj-y := irq.o clock.o gpio.o time.o devices.o cpu.o system.o
+obj-y := clock.o gpio.o time.o devices.o cpu.o system.o
+
+# MX51 uses the TZIC interrupt controller, older platforms use AVIC
+ifeq ($(CONFIG_MXC_TZIC),y)
+obj-y += tzic.o
+else
+obj-y += irq.o
+endif

obj-$(CONFIG_ARCH_MX1) += iomux-mx1-mx2.o dma-mx1-mx2.o
obj-$(CONFIG_ARCH_MX2) += iomux-mx1-mx2.o dma-mx1-mx2.o
diff --git a/arch/arm/plat-mxc/tzic.c b/arch/arm/plat-mxc/tzic.c
new file mode 100644
index 0000000..3af8fc6
--- /dev/null
+++ b/arch/arm/plat-mxc/tzic.c
@@ -0,0 +1,180 @@
+/*
+ * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <mach/hardware.h>
+#include <linux/io.h>
+#include <asm/mach/irq.h>
+
+/*
+ *****************************************
+ * TZIC Registers *
+ *****************************************
+ */
+
+#define TZIC_INTCNTL 0x0000 /* control register */
+#define TZIC_INTTYPE 0x0004 /* Controller type register */
+#define TZIC_IMPID 0x0008 /* Distributor Implementer Identification Register */
+#define TZIC_PRIOMASK 0x000C /* Priority Mask Reg */
+#define TZIC_SYNCCTRL 0x0010 /* Synchronizer Control register */
+#define TZIC_DSMINT 0x0014 /* DSM interrupt Holdoffregister */
+#define TZIC_INTSEC0 0x0080 /* interrupt security register 0 */
+#define TZIC_ENSET0 0x0100 /* Enable Set Register 0 */
+#define TZIC_ENCLEAR0 0x0180 /* Enable Clear Register 0 */
+#define TZIC_SRCSET0 0x0200 /* Source Set Register 0 */
+#define TZIC_SRCCLAR0 0x0280 /* Source Clear Register 0 */
+#define TZIC_PRIORITY0 0x0400 /* Priority Register 0 */
+#define TZIC_PND0 0x0D00 /* Pending Register 0 */
+#define TZIC_HIPND0 0x0D80 /* High Priority Pending Register */
+#define TZIC_WAKEUP0 0x0E00 /* Wakeup Config Register */
+#define TZIC_SWINT 0x0F00 /* Software Interrupt Rigger Register */
+#define TZIC_ID0 0x0FD0 /* Indentification Register 0 */
+
+void __iomem *tzic_base;
+
+/*!
+ * Disable interrupt number "irq" in the TZIC
+ *
+ * @param irq interrupt source number
+ */
+static void mxc_mask_irq(unsigned int irq)
+{
+ int index, off;
+
+ index = irq >> 5;
+ off = irq & 0x1F;
+ __raw_writel(1 << off, tzic_base + TZIC_ENCLEAR0 + (index << 2));
+}
+
+/*!
+ * Enable interrupt number "irq" in the TZIC
+ *
+ * @param irq interrupt source number
+ */
+static void mxc_unmask_irq(unsigned int irq)
+{
+ int index, off;
+
+ index = irq >> 5;
+ off = irq & 0x1F;
+ __raw_writel(1 << off, tzic_base + TZIC_ENSET0 + (index << 2));
+}
+
+static unsigned int wakeup_intr[4];
+
+/*
+ * Set interrupt number "irq" in the TZIC as a wake-up source.
+ *
+ * @param irq interrupt source number
+ * @param enable enable as wake-up if equal to non-zero
+ * disble as wake-up if equal to zero
+ *
+ * @return This function returns 0 on success.
+ */
+static int mxc_set_wake_irq(unsigned int irq, unsigned int enable)
+{
+ unsigned int index, off;
+
+ index = irq >> 5;
+ off = irq & 0x1F;
+
+ if (index > 3)
+ return -1;
+
+ if (enable)
+ wakeup_intr[index] |= (1 << off);
+ else
+ wakeup_intr[index] &= ~(1 << off);
+
+ return 0;
+}
+
+static struct irq_chip mxc_tzic_chip = {
+ .name = "MXC_TZIC",
+ .ack = mxc_mask_irq,
+ .mask = mxc_mask_irq,
+ .unmask = mxc_unmask_irq,
+ .set_wake = mxc_set_wake_irq,
+};
+
+/*
+ * This function initializes the TZIC hardware and disables all the
+ * interrupts. It registers the interrupt enable and disable functions
+ * to the kernel for each interrupt source.
+ */
+void __init mxc_init_irq(void __iomem *irqbase)
+{
+ int i;
+
+ tzic_base = irqbase;
+ /* put the TZIC into the reset value with
+ * all interrupts disabled
+ */
+ i = __raw_readl(tzic_base + TZIC_INTCNTL);
+
+ __raw_writel(0x80010001, tzic_base + TZIC_INTCNTL);
+ i = __raw_readl(tzic_base + TZIC_INTCNTL);
+ __raw_writel(0x1f, tzic_base + TZIC_PRIOMASK);
+ i = __raw_readl(tzic_base + TZIC_PRIOMASK);
+ __raw_writel(0x02, tzic_base + TZIC_SYNCCTRL);
+ i = __raw_readl(tzic_base + TZIC_SYNCCTRL);
+ for (i = 0; i < 4; i++) {
+ __raw_writel(0xFFFFFFFF, tzic_base + TZIC_INTSEC0 + i * 4);
+ }
+ /* disable all interrupts */
+ for (i = 0; i < 4; i++) {
+ __raw_writel(0xFFFFFFFF, tzic_base + TZIC_ENCLEAR0 + i * 4);
+ }
+
+ /* all IRQ no FIQ Warning :: No selection */
+
+ for (i = 0; i < MXC_INTERNAL_IRQS; i++) {
+ set_irq_chip(i, &mxc_tzic_chip);
+ set_irq_handler(i, handle_level_irq);
+ set_irq_flags(i, IRQF_VALID);
+ }
+
+ printk(KERN_INFO "MXC IRQ initialized\n");
+}
+
+/*
+ * enable wakeup interrupt
+ *
+ * @param is_idle 1 if called in idle loop (enset registers);
+ * 0 to be used when called from low power entry
+ * @return 0 if successful; non-zero otherwise
+ *
+ */
+int tzic_enable_wake(int is_idle)
+{
+ unsigned int i, v;
+
+ __raw_writel(1, tzic_base + TZIC_DSMINT);
+ if (unlikely(__raw_readl(tzic_base + TZIC_DSMINT) == 0))
+ return -EAGAIN;
+
+ if (likely(is_idle)) {
+ for (i = 0; i < 4; i++) {
+ v = __raw_readl(tzic_base + TZIC_ENSET0 + i * 4);
+ __raw_writel(v, tzic_base + TZIC_WAKEUP0 + i * 4);
+ }
+ } else {
+ for (i = 0; i < 4; i++) {
+ v = wakeup_intr[i];
+ __raw_writel(v, tzic_base + TZIC_WAKEUP0 + i * 4);
+ }
+ }
+ return 0;
+}
--
1.6.3.3


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