1 files changed, 220 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/tzic.c b/arch/arm/mach-imx/tzic.c
new file mode 100644
index 000000000..479a01bda
--- /dev/null
+++ b/arch/arm/mach-imx/tzic.c
@@ -0,0 +1,220 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C)2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/irqchip.h>
+#include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/of_address.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 */
+
+static void __iomem *tzic_base;
+static struct irq_domain *domain;
+
+#define TZIC_NUM_IRQS 128
+
+#ifdef CONFIG_FIQ
+static int tzic_set_irq_fiq(unsigned int hwirq, unsigned int type)
+{
+	unsigned int index, mask, value;
+
+	index = hwirq >> 5;
+	if (unlikely(index >= 4))
+		return -EINVAL;
+	mask = 1U << (hwirq & 0x1F);
+
+	value = imx_readl(tzic_base + TZIC_INTSEC0(index)) | mask;
+	if (type)
+		value &= ~mask;
+	imx_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;
+
+	imx_writel(gc->wake_active, tzic_base + TZIC_WAKEUP0(idx));
+}
+
+static void tzic_irq_resume(struct irq_data *d)
+{
+	int idx = d->hwirq >> 5;
+
+	imx_writel(imx_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);
+}
+
+static 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 = imx_readl(tzic_base + TZIC_HIPND(i)) &
+				imx_readl(tzic_base + TZIC_INTSEC0(i));
+
+			while (stat) {
+				handled = 1;
+				irqofs = fls(stat) - 1;
+				handle_domain_irq(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.
+ */
+static int __init tzic_init_dt(struct device_node *np, struct device_node *p)
+{
+	int irq_base;
+	int i;
+
+	tzic_base = of_iomap(np, 0);
+	WARN_ON(!tzic_base);
+
+	/* put the TZIC into the reset value with
+	 * all interrupts disabled
+	 */
+	i = imx_readl(tzic_base + TZIC_INTCNTL);
+
+	imx_writel(0x80010001, tzic_base + TZIC_INTCNTL);
+	imx_writel(0x1f, tzic_base + TZIC_PRIOMASK);
+	imx_writel(0x02, tzic_base + TZIC_SYNCCTRL);
+
+	for (i = 0; i < 4; i++)
+		imx_writel(0xFFFFFFFF, tzic_base + TZIC_INTSEC0(i));
+
+	/* disable all interrupts */
+	for (i = 0; i < 4; i++)
+		imx_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);
+
+	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);
+
+	set_handle_irq(tzic_handle_irq);
+
+#ifdef CONFIG_FIQ
+	/* Initialize FIQ */
+	init_FIQ(FIQ_START);
+#endif
+
+	pr_info("TrustZone Interrupt Controller (TZIC) initialized\n");
+
+	return 0;
+}
+IRQCHIP_DECLARE(tzic, "fsl,tzic", tzic_init_dt);
+
+/**
+ * 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;
+
+	imx_writel(1, tzic_base + TZIC_DSMINT);
+	if (unlikely(imx_readl(tzic_base + TZIC_DSMINT) == 0))
+		return -EAGAIN;
+
+	for (i = 0; i < 4; i++)
+		imx_writel(imx_readl(tzic_base + TZIC_ENSET0(i)),
+			   tzic_base + TZIC_WAKEUP0(i));
+
+	return 0;
+}