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/*
* 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;
}
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