mxc: TrustZone interrupt controller (TZIC) for Freescale i.MX5 family

Freescale i.MX51 processor uses a new interrupt controller. Add
driver for TrustZone Interrupt Controller

Signed-off-by: Amit Kucheria <amit.kucheria@canonical.com>

3 files changed, 39 insertions, 2 deletions

diff --git a/arch/arm/plat-mxc/include/mach/common.h b/arch/arm/plat-mxc/include/mach/common.h
index 4bf1068ffad9..1394025068c3 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 7cf290efe768..aeb08697726b 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@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 0cb347645db4..38f150162e45 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