mxc: TrustZone interrupt controller (TZIC) for Freescale i.MX5 family
authorAmit Kucheria <amit.kucheria@canonical.com>
Thu, 3 Dec 2009 20:36:41 +0000 (22:36 +0200)
committerAmit Kucheria <amit.kucheria@canonical.com>
Tue, 9 Feb 2010 14:15:26 +0000 (16:15 +0200)
Freescale i.MX51 processor uses a new interrupt controller. Add
driver for TrustZone Interrupt Controller

Signed-off-by: Amit Kucheria <amit.kucheria@canonical.com>
arch/arm/plat-mxc/Kconfig
arch/arm/plat-mxc/Makefile
arch/arm/plat-mxc/include/mach/common.h
arch/arm/plat-mxc/include/mach/entry-macro.S
arch/arm/plat-mxc/include/mach/irqs.h
arch/arm/plat-mxc/tzic.c [new file with mode: 0644]

index 8b0a1ee..59558c4 100644 (file)
@@ -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
index 7322bca..a4bc6cb 100644 (file)
@@ -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
index 4bf1068..1394025 100644 (file)
@@ -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);
index 7cf290e..aeb0869 100644 (file)
@@ -1,6 +1,6 @@
 /*
  *  Copyright (C) 2007 Lennert Buytenhek <buytenh@wantstofly.org>
- *  Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ *  Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
  */
 
 /*
        .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]
        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)
index 0cb3476..38f1501 100644 (file)
 #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 (file)
index 0000000..afa6709
--- /dev/null
@@ -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;
+}