[PATCHv3 1/7] mxc: TrustZone interrupt controller (TZIC) for Freescale i.MX5 family
Amit Kucheria
amit.kucheria at canonical.com
Tue Feb 9 11:59:49 EST 2010
Freescale i.MX51 processor uses a new interrupt controller. Add
driver for TrustZone Interrupt Controller
Signed-off-by: Amit Kucheria <amit.kucheria at canonical.com>
---
arch/arm/plat-mxc/Kconfig | 8 ++
arch/arm/plat-mxc/Makefile | 3 +
arch/arm/plat-mxc/include/mach/common.h | 1 +
arch/arm/plat-mxc/include/mach/entry-macro.S | 34 +++++-
arch/arm/plat-mxc/include/mach/irqs.h | 6 +-
arch/arm/plat-mxc/tzic.c | 172 ++++++++++++++++++++++++++
6 files changed, 222 insertions(+), 2 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 8b0a1ee..59558c4 100644
--- a/arch/arm/plat-mxc/Kconfig
+++ b/arch/arm/plat-mxc/Kconfig
@@ -62,6 +62,14 @@ config MXC_IRQ_PRIOR
requirements for timing.
Say N here, unless you have a specialized requirement.
+config MXC_TZIC
+ bool "Enable TrustZone Interrupt Controller"
+ depends on ARCH_MX51
+ help
+ This will be automatically selected for all processors
+ containing this interrupt controller.
+ Say N here only if you are really sure.
+
config MXC_PWM
tristate "Enable PWM driver"
depends on ARCH_MXC
diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile
index 7322bca..a4bc6cb 100644
--- a/arch/arm/plat-mxc/Makefile
+++ b/arch/arm/plat-mxc/Makefile
@@ -5,6 +5,9 @@
# Common support
obj-y := irq.o clock.o gpio.o time.o devices.o cpu.o system.o
+# MX51 uses the TZIC interrupt controller, older platforms use AVIC (irq.o)
+obj-$(CONFIG_MXC_TZIC) += tzic.o
+
obj-$(CONFIG_ARCH_MX1) += iomux-mx1-mx2.o dma-mx1-mx2.o
obj-$(CONFIG_ARCH_MX2) += iomux-mx1-mx2.o dma-mx1-mx2.o
CFLAGS_iomux-mx1-mx2.o = -DIMX_NEEDS_DEPRECATED_SYMBOLS
diff --git a/arch/arm/plat-mxc/include/mach/common.h b/arch/arm/plat-mxc/include/mach/common.h
index 4bf1068..1394025 100644
--- a/arch/arm/plat-mxc/include/mach/common.h
+++ b/arch/arm/plat-mxc/include/mach/common.h
@@ -22,6 +22,7 @@ extern void mx31_map_io(void);
extern void mx35_map_io(void);
extern void mxc91231_map_io(void);
extern void mxc_init_irq(void __iomem *);
+extern void tzic_init_irq(void __iomem *);
extern void mx1_init_irq(void);
extern void mx21_init_irq(void);
extern void mx25_init_irq(void);
diff --git a/arch/arm/plat-mxc/include/mach/entry-macro.S b/arch/arm/plat-mxc/include/mach/entry-macro.S
index 7cf290e..aeb0869 100644
--- a/arch/arm/plat-mxc/include/mach/entry-macro.S
+++ b/arch/arm/plat-mxc/include/mach/entry-macro.S
@@ -1,6 +1,6 @@
/*
* Copyright (C) 2007 Lennert Buytenhek <buytenh at wantstofly.org>
- * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
@@ -18,11 +18,16 @@
.endm
.macro get_irqnr_preamble, base, tmp
+#ifndef CONFIG_MXC_TZIC
ldr \base, =avic_base
ldr \base, [\base]
#ifdef CONFIG_MXC_IRQ_PRIOR
ldr r4, [\base, #AVIC_NIMASK]
#endif
+#elif defined CONFIG_MXC_TZIC
+ ldr \base, =tzic_base
+ ldr \base, [\base]
+#endif /* CONFIG_MXC_TZIC */
.endm
.macro arch_ret_to_user, tmp1, tmp2
@@ -32,6 +37,7 @@
@ and returns its number in irqnr
@ and returns if an interrupt occured in irqstat
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
+#ifndef CONFIG_MXC_TZIC
@ Load offset & priority of the highest priority
@ interrupt pending from AVIC_NIVECSR
ldr \irqstat, [\base, #0x40]
@@ -45,6 +51,32 @@
strne \tmp, [\base, #AVIC_NIMASK]
streq r4, [\base, #AVIC_NIMASK]
#endif
+#elif defined CONFIG_MXC_TZIC
+ @ Load offset & priority of the highest priority
+ @ interrupt pending.
+ @ 0xD80 is HIPND0 register
+ mov \irqnr, #0
+ mov \irqstat, #0x0D80
+1000:
+ ldr \tmp, [\irqstat, \base]
+ cmp \tmp, #0
+ bne 1001f
+ addeq \irqnr, \irqnr, #32
+ addeq \irqstat, \irqstat, #4
+ cmp \irqnr, #128
+ blo 1000b
+ b 2001f
+1001: mov \irqstat, #1
+1002: tst \tmp, \irqstat
+ bne 2002f
+ movs \tmp, \tmp, lsr #1
+ addne \irqnr, \irqnr, #1
+ bne 1002b
+2001:
+ mov \irqnr, #0
+2002:
+ movs \irqnr, \irqnr
+#endif
.endm
@ irq priority table (not used)
diff --git a/arch/arm/plat-mxc/include/mach/irqs.h b/arch/arm/plat-mxc/include/mach/irqs.h
index 0cb3476..38f1501 100644
--- a/arch/arm/plat-mxc/include/mach/irqs.h
+++ b/arch/arm/plat-mxc/include/mach/irqs.h
@@ -12,9 +12,13 @@
#define __ASM_ARCH_MXC_IRQS_H__
/*
- * So far all i.MX SoCs have 64 internal interrupts
+ * SoCs with TZIC interrupt controller have 128 IRQs, those with AVIC have 64
*/
+#ifdef CONFIG_MXC_TZIC
+#define MXC_INTERNAL_IRQS 128
+#else
#define MXC_INTERNAL_IRQS 64
+#endif
#define MXC_GPIO_IRQ_START MXC_INTERNAL_IRQS
diff --git a/arch/arm/plat-mxc/tzic.c b/arch/arm/plat-mxc/tzic.c
new file mode 100644
index 0000000..afa6709
--- /dev/null
+++ b/arch/arm/plat-mxc/tzic.c
@@ -0,0 +1,172 @@
+/*
+ * 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 <linux/io.h>
+
+#include <asm/mach/irq.h>
+
+#include <mach/hardware.h>
+
+/*
+ *****************************************
+ * TZIC Registers *
+ *****************************************
+ */
+
+#define TZIC_INTCNTL 0x0000 /* Control register */
+#define TZIC_INTTYPE 0x0004 /* Controller Type register */
+#define TZIC_IMPID 0x0008 /* Distributor Implementer Identification */
+#define TZIC_PRIOMASK 0x000C /* Priority Mask Reg */
+#define TZIC_SYNCCTRL 0x0010 /* Synchronizer Control register */
+#define TZIC_DSMINT 0x0014 /* DSM interrupt Holdoffregister */
+#define TZIC_INTSEC0(i) (0x0080 + ((i) << 2)) /* Interrupt Security Reg 0 */
+#define TZIC_ENSET0(i) (0x0100 + ((i) << 2)) /* Enable Set Reg 0 */
+#define TZIC_ENCLEAR0(i) (0x0180 + ((i) << 2)) /* Enable Clear Reg 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(i) (0x0E00 + ((i) << 2)) /* Wakeup Config Register */
+#define TZIC_SWINT 0x0F00 /* Software Interrupt Rigger Register */
+#define TZIC_ID0 0x0FD0 /* Indentification Register 0 */
+
+void __iomem *tzic_base; /* Used as irq controller base in entry-macro.S */
+
+/**
+ * tzic_mask_irq() - Disable interrupt number "irq" in the TZIC
+ *
+ * @param irq interrupt source number
+ */
+static void tzic_mask_irq(unsigned int irq)
+{
+ int index, off;
+
+ index = irq >> 5;
+ off = irq & 0x1F;
+ __raw_writel(1 << off, tzic_base + TZIC_ENCLEAR0(index));
+}
+
+/**
+ * tzic_unmask_irq() - Enable interrupt number "irq" in the TZIC
+ *
+ * @param irq interrupt source number
+ */
+static void tzic_unmask_irq(unsigned int irq)
+{
+ int index, off;
+
+ index = irq >> 5;
+ off = irq & 0x1F;
+ __raw_writel(1 << off, tzic_base + TZIC_ENSET0(index));
+}
+
+static unsigned int wakeup_intr[4];
+
+/**
+ * tzic_set_wake_irq() - 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 tzic_set_wake_irq(unsigned int irq, unsigned int enable)
+{
+ unsigned int index, off;
+
+ index = irq >> 5;
+ off = irq & 0x1F;
+
+ if (index > 3)
+ return -EINVAL;
+
+ 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 = tzic_mask_irq,
+ .mask = tzic_mask_irq,
+ .unmask = tzic_unmask_irq,
+ .set_wake = tzic_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 tzic_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);
+ __raw_writel(0x1f, tzic_base + TZIC_PRIOMASK);
+ __raw_writel(0x02, tzic_base + TZIC_SYNCCTRL);
+
+ for (i = 0; i < 4; i++)
+ __raw_writel(0xFFFFFFFF, tzic_base + TZIC_INTSEC0(i));
+
+ /* disable all interrupts */
+ for (i = 0; i < 4; i++)
+ __raw_writel(0xFFFFFFFF, tzic_base + TZIC_ENCLEAR0(i));
+
+ /* 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);
+ }
+
+ pr_info("TrustZone Interrupt Controller (TZIC) initialized\n");
+}
+
+/**
+ * tzic_enable_wake() - enable wakeup interrupt
+ *
+ * @param is_idle 1 if called in idle loop (ENSET0 register);
+ * 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;
+
+ for (i = 0; i < 4; i++) {
+ v = is_idle ? __raw_readl(TZIC_ENSET0(i)) : wakeup_intr[i];
+ __raw_writel(v, TZIC_WAKEUP0(i));
+ }
+
+ return 0;
+}
--
1.6.3.3
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