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alistair23-linux/arch/arm/mach-imx/irq.c
Pavel Pisa 1c016b2c72 [ARM] 4648/1: i.MX/MX1 ensure more complete AITC initialization 
The AITC code did not allow to start kernel, if bootloader
manipulates with interrupt level mask. The change ensures,
that NIMASK is initialized into correct state and that
interrupts enable registers are cleared.

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-11-26 19:43:37 +00:00

290 lines
7.7 KiB
C
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/*
* linux/arch/arm/mach-imx/irq.c
*
* Copyright (C) 1999 ARM Limited
* Copyright (C) 2002 Shane Nay (shane@minirl.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* 03/03/2004 Sascha Hauer <sascha@saschahauer.de>
* Copied from the motorola bsp package and added gpio demux
* interrupt handler
*/
#include <linux/init.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/mach/irq.h>
/*
*
* We simply use the ENABLE DISABLE registers inside of the IMX
* to turn on/off specific interrupts. FIXME- We should
* also add support for the accelerated interrupt controller
* by putting offets to irq jump code in the appropriate
* places.
*
*/
#define INTCNTL_OFF 0x00
#define NIMASK_OFF 0x04
#define INTENNUM_OFF 0x08
#define INTDISNUM_OFF 0x0C
#define INTENABLEH_OFF 0x10
#define INTENABLEL_OFF 0x14
#define INTTYPEH_OFF 0x18
#define INTTYPEL_OFF 0x1C
#define NIPRIORITY_OFF(x) (0x20+4*(7-(x)))
#define NIVECSR_OFF 0x40
#define FIVECSR_OFF 0x44
#define INTSRCH_OFF 0x48
#define INTSRCL_OFF 0x4C
#define INTFRCH_OFF 0x50
#define INTFRCL_OFF 0x54
#define NIPNDH_OFF 0x58
#define NIPNDL_OFF 0x5C
#define FIPNDH_OFF 0x60
#define FIPNDL_OFF 0x64
#define VA_AITC_BASE IO_ADDRESS(IMX_AITC_BASE)
#define IMX_AITC_INTCNTL (VA_AITC_BASE + INTCNTL_OFF)
#define IMX_AITC_NIMASK (VA_AITC_BASE + NIMASK_OFF)
#define IMX_AITC_INTENNUM (VA_AITC_BASE + INTENNUM_OFF)
#define IMX_AITC_INTDISNUM (VA_AITC_BASE + INTDISNUM_OFF)
#define IMX_AITC_INTENABLEH (VA_AITC_BASE + INTENABLEH_OFF)
#define IMX_AITC_INTENABLEL (VA_AITC_BASE + INTENABLEL_OFF)
#define IMX_AITC_INTTYPEH (VA_AITC_BASE + INTTYPEH_OFF)
#define IMX_AITC_INTTYPEL (VA_AITC_BASE + INTTYPEL_OFF)
#define IMX_AITC_NIPRIORITY(x) (VA_AITC_BASE + NIPRIORITY_OFF(x))
#define IMX_AITC_NIVECSR (VA_AITC_BASE + NIVECSR_OFF)
#define IMX_AITC_FIVECSR (VA_AITC_BASE + FIVECSR_OFF)
#define IMX_AITC_INTSRCH (VA_AITC_BASE + INTSRCH_OFF)
#define IMX_AITC_INTSRCL (VA_AITC_BASE + INTSRCL_OFF)
#define IMX_AITC_INTFRCH (VA_AITC_BASE + INTFRCH_OFF)
#define IMX_AITC_INTFRCL (VA_AITC_BASE + INTFRCL_OFF)
#define IMX_AITC_NIPNDH (VA_AITC_BASE + NIPNDH_OFF)
#define IMX_AITC_NIPNDL (VA_AITC_BASE + NIPNDL_OFF)
#define IMX_AITC_FIPNDH (VA_AITC_BASE + FIPNDH_OFF)
#define IMX_AITC_FIPNDL (VA_AITC_BASE + FIPNDL_OFF)
#if 0
#define DEBUG_IRQ(fmt...) printk(fmt)
#else
#define DEBUG_IRQ(fmt...) do { } while (0)
#endif
static void
imx_mask_irq(unsigned int irq)
{
__raw_writel(irq, IMX_AITC_INTDISNUM);
}
static void
imx_unmask_irq(unsigned int irq)
{
__raw_writel(irq, IMX_AITC_INTENNUM);
}
static int
imx_gpio_irq_type(unsigned int _irq, unsigned int type)
{
unsigned int irq_type = 0, irq, reg, bit;
irq = _irq - IRQ_GPIOA(0);
reg = irq >> 5;
bit = 1 << (irq % 32);
if (type == IRQT_PROBE) {
/* Don't mess with enabled GPIOs using preconfigured edges or
GPIOs set to alternate function during probe */
/* TODO: support probe */
// if ((GPIO_IRQ_rising_edge[idx] | GPIO_IRQ_falling_edge[idx]) &
// GPIO_bit(gpio))
// return 0;
// if (GAFR(gpio) & (0x3 << (((gpio) & 0xf)*2)))
// return 0;
// type = __IRQT_RISEDGE | __IRQT_FALEDGE;
}
GIUS(reg) |= bit;
DDIR(reg) &= ~(bit);
DEBUG_IRQ("setting type of irq %d to ", _irq);
if (type & __IRQT_RISEDGE) {
DEBUG_IRQ("rising edges\n");
irq_type = 0x0;
}
if (type & __IRQT_FALEDGE) {
DEBUG_IRQ("falling edges\n");
irq_type = 0x1;
}
if (type & __IRQT_LOWLVL) {
DEBUG_IRQ("low level\n");
irq_type = 0x3;
}
if (type & __IRQT_HIGHLVL) {
DEBUG_IRQ("high level\n");
irq_type = 0x2;
}
if (irq % 32 < 16) {
ICR1(reg) = (ICR1(reg) & ~(0x3 << ((irq % 16) * 2))) |
(irq_type << ((irq % 16) * 2));
} else {
ICR2(reg) = (ICR2(reg) & ~(0x3 << ((irq % 16) * 2))) |
(irq_type << ((irq % 16) * 2));
}
return 0;
}
static void
imx_gpio_ack_irq(unsigned int irq)
{
DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, irq);
ISR(IRQ_TO_REG(irq)) = 1 << ((irq - IRQ_GPIOA(0)) % 32);
}
static void
imx_gpio_mask_irq(unsigned int irq)
{
DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, irq);
IMR(IRQ_TO_REG(irq)) &= ~( 1 << ((irq - IRQ_GPIOA(0)) % 32));
}
static void
imx_gpio_unmask_irq(unsigned int irq)
{
DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, irq);
IMR(IRQ_TO_REG(irq)) |= 1 << ((irq - IRQ_GPIOA(0)) % 32);
}
static void
imx_gpio_handler(unsigned int mask, unsigned int irq,
struct irq_desc *desc)
{
desc = irq_desc + irq;
while (mask) {
if (mask & 1) {
DEBUG_IRQ("handling irq %d\n", irq);
desc_handle_irq(irq, desc);
}
irq++;
desc++;
mask >>= 1;
}
}
static void
imx_gpioa_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
{
unsigned int mask, irq;
mask = ISR(0);
irq = IRQ_GPIOA(0);
imx_gpio_handler(mask, irq, desc);
}
static void
imx_gpiob_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
{
unsigned int mask, irq;
mask = ISR(1);
irq = IRQ_GPIOB(0);
imx_gpio_handler(mask, irq, desc);
}
static void
imx_gpioc_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
{
unsigned int mask, irq;
mask = ISR(2);
irq = IRQ_GPIOC(0);
imx_gpio_handler(mask, irq, desc);
}
static void
imx_gpiod_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
{
unsigned int mask, irq;
mask = ISR(3);
irq = IRQ_GPIOD(0);
imx_gpio_handler(mask, irq, desc);
}
static struct irq_chip imx_internal_chip = {
.name = "MPU",
.ack = imx_mask_irq,
.mask = imx_mask_irq,
.unmask = imx_unmask_irq,
};
static struct irq_chip imx_gpio_chip = {
.name = "GPIO",
.ack = imx_gpio_ack_irq,
.mask = imx_gpio_mask_irq,
.unmask = imx_gpio_unmask_irq,
.set_type = imx_gpio_irq_type,
};
void __init
imx_init_irq(void)
{
unsigned int irq;
DEBUG_IRQ("Initializing imx interrupts\n");
/* Disable all interrupts initially. */
/* Do not rely on the bootloader. */
__raw_writel(0, IMX_AITC_INTENABLEH);
__raw_writel(0, IMX_AITC_INTENABLEL);
/* Mask all GPIO interrupts as well */
IMR(0) = 0;
IMR(1) = 0;
IMR(2) = 0;
IMR(3) = 0;
for (irq = 0; irq < IMX_IRQS; irq++) {
set_irq_chip(irq, &imx_internal_chip);
set_irq_handler(irq, handle_level_irq);
set_irq_flags(irq, IRQF_VALID);
}
for (irq = IRQ_GPIOA(0); irq < IRQ_GPIOD(32); irq++) {
set_irq_chip(irq, &imx_gpio_chip);
set_irq_handler(irq, handle_edge_irq);
set_irq_flags(irq, IRQF_VALID);
}
set_irq_chained_handler(GPIO_INT_PORTA, imx_gpioa_demux_handler);
set_irq_chained_handler(GPIO_INT_PORTB, imx_gpiob_demux_handler);
set_irq_chained_handler(GPIO_INT_PORTC, imx_gpioc_demux_handler);
set_irq_chained_handler(GPIO_INT_PORTD, imx_gpiod_demux_handler);
/* Release masking of interrupts according to priority */
__raw_writel(-1, IMX_AITC_NIMASK);
}
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