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-rw-r--r--arch/arm/mach-imx/tzic.c222
1 files changed, 222 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/tzic.c b/arch/arm/mach-imx/tzic.c
new file mode 100644
index 00000000000..9721161f208
--- /dev/null
+++ b/arch/arm/mach-imx/tzic.c
@@ -0,0 +1,222 @@
+/*
+ * Copyright (C)2004-2010 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 <linux/irqdomain.h>
+#include <linux/of.h>
+
+#include <asm/mach/irq.h>
+#include <asm/exception.h>
+
+#include "common.h"
+#include "hardware.h"
+#include "irq-common.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_HIPND(i) (0x0D80+ ((i) << 2)) /* 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 */
+static struct irq_domain *domain;
+
+#define TZIC_NUM_IRQS 128
+
+#ifdef CONFIG_FIQ
+static int tzic_set_irq_fiq(unsigned int irq, unsigned int type)
+{
+ unsigned int index, mask, value;
+
+ index = irq >> 5;
+ if (unlikely(index >= 4))
+ return -EINVAL;
+ mask = 1U << (irq & 0x1F);
+
+ value = __raw_readl(tzic_base + TZIC_INTSEC0(index)) | mask;
+ if (type)
+ value &= ~mask;
+ __raw_writel(value, tzic_base + TZIC_INTSEC0(index));
+
+ return 0;
+}
+#else
+#define tzic_set_irq_fiq NULL
+#endif
+
+#ifdef CONFIG_PM
+static void tzic_irq_suspend(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ int idx = d->hwirq >> 5;
+
+ __raw_writel(gc->wake_active, tzic_base + TZIC_WAKEUP0(idx));
+}
+
+static void tzic_irq_resume(struct irq_data *d)
+{
+ int idx = d->hwirq >> 5;
+
+ __raw_writel(__raw_readl(tzic_base + TZIC_ENSET0(idx)),
+ tzic_base + TZIC_WAKEUP0(idx));
+}
+
+#else
+#define tzic_irq_suspend NULL
+#define tzic_irq_resume NULL
+#endif
+
+static struct mxc_extra_irq tzic_extra_irq = {
+#ifdef CONFIG_FIQ
+ .set_irq_fiq = tzic_set_irq_fiq,
+#endif
+};
+
+static __init void tzic_init_gc(int idx, unsigned int irq_start)
+{
+ struct irq_chip_generic *gc;
+ struct irq_chip_type *ct;
+
+ gc = irq_alloc_generic_chip("tzic", 1, irq_start, tzic_base,
+ handle_level_irq);
+ gc->private = &tzic_extra_irq;
+ gc->wake_enabled = IRQ_MSK(32);
+
+ ct = gc->chip_types;
+ ct->chip.irq_mask = irq_gc_mask_disable_reg;
+ ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
+ ct->chip.irq_set_wake = irq_gc_set_wake;
+ ct->chip.irq_suspend = tzic_irq_suspend;
+ ct->chip.irq_resume = tzic_irq_resume;
+ ct->regs.disable = TZIC_ENCLEAR0(idx);
+ ct->regs.enable = TZIC_ENSET0(idx);
+
+ irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0);
+}
+
+asmlinkage void __exception_irq_entry tzic_handle_irq(struct pt_regs *regs)
+{
+ u32 stat;
+ int i, irqofs, handled;
+
+ do {
+ handled = 0;
+
+ for (i = 0; i < 4; i++) {
+ stat = __raw_readl(tzic_base + TZIC_HIPND(i)) &
+ __raw_readl(tzic_base + TZIC_INTSEC0(i));
+
+ while (stat) {
+ handled = 1;
+ irqofs = fls(stat) - 1;
+ handle_IRQ(irq_find_mapping(domain,
+ irqofs + i * 32), regs);
+ stat &= ~(1 << irqofs);
+ }
+ }
+ } while (handled);
+}
+
+/*
+ * 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)
+{
+ struct device_node *np;
+ int irq_base;
+ 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 */
+
+ irq_base = irq_alloc_descs(-1, 0, TZIC_NUM_IRQS, numa_node_id());
+ WARN_ON(irq_base < 0);
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,tzic");
+ domain = irq_domain_add_legacy(np, TZIC_NUM_IRQS, irq_base, 0,
+ &irq_domain_simple_ops, NULL);
+ WARN_ON(!domain);
+
+ for (i = 0; i < 4; i++, irq_base += 32)
+ tzic_init_gc(i, irq_base);
+
+#ifdef CONFIG_FIQ
+ /* Initialize FIQ */
+ init_FIQ(FIQ_START);
+#endif
+
+ pr_info("TrustZone Interrupt Controller (TZIC) initialized\n");
+}
+
+/**
+ * tzic_enable_wake() - enable wakeup interrupt
+ *
+ * @return 0 if successful; non-zero otherwise
+ *
+ * This function provides an interrupt synchronization point that is required
+ * by tzic enabled platforms before entering imx specific low power modes (ie,
+ * those low power modes beyond the WAIT_CLOCKED basic ARM WFI only mode).
+ */
+int tzic_enable_wake(void)
+{
+ unsigned int i;
+
+ __raw_writel(1, tzic_base + TZIC_DSMINT);
+ if (unlikely(__raw_readl(tzic_base + TZIC_DSMINT) == 0))
+ return -EAGAIN;
+
+ for (i = 0; i < 4; i++)
+ __raw_writel(__raw_readl(tzic_base + TZIC_ENSET0(i)),
+ tzic_base + TZIC_WAKEUP0(i));
+
+ return 0;
+}