openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Amit Kucheria 2009-12-03 22:36:41 +02:00
parent cb2dc111b1
commit a003708ad4
6 changed files with 222 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/arm/plat-mxc/Kconfig
View 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

3
arch/arm/plat-mxc/Makefile
View 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

1
arch/arm/plat-mxc/include/mach/common.h
View 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);

34
arch/arm/plat-mxc/include/mach/entry-macro.S
View 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.
*/
/*
@ -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]
@ -44,6 +50,32 @@
bicne \tmp, \irqstat, #0xFFFFFFE0
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

6
arch/arm/plat-mxc/include/mach/irqs.h
View File

@ -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

172
arch/arm/plat-mxc/tzic.c Normal file
View File

@ -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;
}