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linux/arch/arm/plat-s3c24xx/irq.c
Ben Dooks 229fd8ffba ARM: S3C24XX: Add FIQ IRQ routing support 
Add support for routing an IRQ from the normal ARM IRQ mechanism to the
FIQ input of the processor.

Note, also fix a bug where the init_FIQ() function has not been called
when CONFIG_FIQ is enabled.

Signed-off-by; Ben Dooks <ben@simtec.co.uk>

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2009-08-14 01:13:28 +01:00

678 lines
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/* linux/arch/arm/plat-s3c24xx/irq.c
*
* Copyright (c) 2003,2004 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* 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
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/sysdev.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <plat/regs-irqtype.h>
#include <plat/cpu.h>
#include <plat/pm.h>
#include <plat/irq.h>
static void
s3c_irq_mask(unsigned int irqno)
{
unsigned long mask;
irqno -= IRQ_EINT0;
mask = __raw_readl(S3C2410_INTMSK);
mask |= 1UL << irqno;
__raw_writel(mask, S3C2410_INTMSK);
}
static inline void
s3c_irq_ack(unsigned int irqno)
{
unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
__raw_writel(bitval, S3C2410_SRCPND);
__raw_writel(bitval, S3C2410_INTPND);
}
static inline void
s3c_irq_maskack(unsigned int irqno)
{
unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
unsigned long mask;
mask = __raw_readl(S3C2410_INTMSK);
__raw_writel(mask|bitval, S3C2410_INTMSK);
__raw_writel(bitval, S3C2410_SRCPND);
__raw_writel(bitval, S3C2410_INTPND);
}
static void
s3c_irq_unmask(unsigned int irqno)
{
unsigned long mask;
if (irqno != IRQ_TIMER4 && irqno != IRQ_EINT8t23)
irqdbf2("s3c_irq_unmask %d\n", irqno);
irqno -= IRQ_EINT0;
mask = __raw_readl(S3C2410_INTMSK);
mask &= ~(1UL << irqno);
__raw_writel(mask, S3C2410_INTMSK);
}
struct irq_chip s3c_irq_level_chip = {
.name = "s3c-level",
.ack = s3c_irq_maskack,
.mask = s3c_irq_mask,
.unmask = s3c_irq_unmask,
.set_wake = s3c_irq_wake
};
struct irq_chip s3c_irq_chip = {
.name = "s3c",
.ack = s3c_irq_ack,
.mask = s3c_irq_mask,
.unmask = s3c_irq_unmask,
.set_wake = s3c_irq_wake
};
static void
s3c_irqext_mask(unsigned int irqno)
{
unsigned long mask;
irqno -= EXTINT_OFF;
mask = __raw_readl(S3C24XX_EINTMASK);
mask |= ( 1UL << irqno);
__raw_writel(mask, S3C24XX_EINTMASK);
}
static void
s3c_irqext_ack(unsigned int irqno)
{
unsigned long req;
unsigned long bit;
unsigned long mask;
bit = 1UL << (irqno - EXTINT_OFF);
mask = __raw_readl(S3C24XX_EINTMASK);
__raw_writel(bit, S3C24XX_EINTPEND);
req = __raw_readl(S3C24XX_EINTPEND);
req &= ~mask;
/* not sure if we should be acking the parent irq... */
if (irqno <= IRQ_EINT7 ) {
if ((req & 0xf0) == 0)
s3c_irq_ack(IRQ_EINT4t7);
} else {
if ((req >> 8) == 0)
s3c_irq_ack(IRQ_EINT8t23);
}
}
static void
s3c_irqext_unmask(unsigned int irqno)
{
unsigned long mask;
irqno -= EXTINT_OFF;
mask = __raw_readl(S3C24XX_EINTMASK);
mask &= ~( 1UL << irqno);
__raw_writel(mask, S3C24XX_EINTMASK);
}
int
s3c_irqext_type(unsigned int irq, unsigned int type)
{
void __iomem *extint_reg;
void __iomem *gpcon_reg;
unsigned long gpcon_offset, extint_offset;
unsigned long newvalue = 0, value;
if ((irq >= IRQ_EINT0) && (irq <= IRQ_EINT3))
{
gpcon_reg = S3C2410_GPFCON;
extint_reg = S3C24XX_EXTINT0;
gpcon_offset = (irq - IRQ_EINT0) * 2;
extint_offset = (irq - IRQ_EINT0) * 4;
}
else if ((irq >= IRQ_EINT4) && (irq <= IRQ_EINT7))
{
gpcon_reg = S3C2410_GPFCON;
extint_reg = S3C24XX_EXTINT0;
gpcon_offset = (irq - (EXTINT_OFF)) * 2;
extint_offset = (irq - (EXTINT_OFF)) * 4;
}
else if ((irq >= IRQ_EINT8) && (irq <= IRQ_EINT15))
{
gpcon_reg = S3C2410_GPGCON;
extint_reg = S3C24XX_EXTINT1;
gpcon_offset = (irq - IRQ_EINT8) * 2;
extint_offset = (irq - IRQ_EINT8) * 4;
}
else if ((irq >= IRQ_EINT16) && (irq <= IRQ_EINT23))
{
gpcon_reg = S3C2410_GPGCON;
extint_reg = S3C24XX_EXTINT2;
gpcon_offset = (irq - IRQ_EINT8) * 2;
extint_offset = (irq - IRQ_EINT16) * 4;
} else
return -1;
/* Set the GPIO to external interrupt mode */
value = __raw_readl(gpcon_reg);
value = (value & ~(3 << gpcon_offset)) | (0x02 << gpcon_offset);
__raw_writel(value, gpcon_reg);
/* Set the external interrupt to pointed trigger type */
switch (type)
{
case IRQ_TYPE_NONE:
printk(KERN_WARNING "No edge setting!\n");
break;
case IRQ_TYPE_EDGE_RISING:
newvalue = S3C2410_EXTINT_RISEEDGE;
break;
case IRQ_TYPE_EDGE_FALLING:
newvalue = S3C2410_EXTINT_FALLEDGE;
break;
case IRQ_TYPE_EDGE_BOTH:
newvalue = S3C2410_EXTINT_BOTHEDGE;
break;
case IRQ_TYPE_LEVEL_LOW:
newvalue = S3C2410_EXTINT_LOWLEV;
break;
case IRQ_TYPE_LEVEL_HIGH:
newvalue = S3C2410_EXTINT_HILEV;
break;
default:
printk(KERN_ERR "No such irq type %d", type);
return -1;
}
value = __raw_readl(extint_reg);
value = (value & ~(7 << extint_offset)) | (newvalue << extint_offset);
__raw_writel(value, extint_reg);
return 0;
}
static struct irq_chip s3c_irqext_chip = {
.name = "s3c-ext",
.mask = s3c_irqext_mask,
.unmask = s3c_irqext_unmask,
.ack = s3c_irqext_ack,
.set_type = s3c_irqext_type,
.set_wake = s3c_irqext_wake
};
static struct irq_chip s3c_irq_eint0t4 = {
.name = "s3c-ext0",
.ack = s3c_irq_ack,
.mask = s3c_irq_mask,
.unmask = s3c_irq_unmask,
.set_wake = s3c_irq_wake,
.set_type = s3c_irqext_type,
};
/* mask values for the parent registers for each of the interrupt types */
#define INTMSK_UART0 (1UL << (IRQ_UART0 - IRQ_EINT0))
#define INTMSK_UART1 (1UL << (IRQ_UART1 - IRQ_EINT0))
#define INTMSK_UART2 (1UL << (IRQ_UART2 - IRQ_EINT0))
#define INTMSK_ADCPARENT (1UL << (IRQ_ADCPARENT - IRQ_EINT0))
/* UART0 */
static void
s3c_irq_uart0_mask(unsigned int irqno)
{
s3c_irqsub_mask(irqno, INTMSK_UART0, 7);
}
static void
s3c_irq_uart0_unmask(unsigned int irqno)
{
s3c_irqsub_unmask(irqno, INTMSK_UART0);
}
static void
s3c_irq_uart0_ack(unsigned int irqno)
{
s3c_irqsub_maskack(irqno, INTMSK_UART0, 7);
}
static struct irq_chip s3c_irq_uart0 = {
.name = "s3c-uart0",
.mask = s3c_irq_uart0_mask,
.unmask = s3c_irq_uart0_unmask,
.ack = s3c_irq_uart0_ack,
};
/* UART1 */
static void
s3c_irq_uart1_mask(unsigned int irqno)
{
s3c_irqsub_mask(irqno, INTMSK_UART1, 7 << 3);
}
static void
s3c_irq_uart1_unmask(unsigned int irqno)
{
s3c_irqsub_unmask(irqno, INTMSK_UART1);
}
static void
s3c_irq_uart1_ack(unsigned int irqno)
{
s3c_irqsub_maskack(irqno, INTMSK_UART1, 7 << 3);
}
static struct irq_chip s3c_irq_uart1 = {
.name = "s3c-uart1",
.mask = s3c_irq_uart1_mask,
.unmask = s3c_irq_uart1_unmask,
.ack = s3c_irq_uart1_ack,
};
/* UART2 */
static void
s3c_irq_uart2_mask(unsigned int irqno)
{
s3c_irqsub_mask(irqno, INTMSK_UART2, 7 << 6);
}
static void
s3c_irq_uart2_unmask(unsigned int irqno)
{
s3c_irqsub_unmask(irqno, INTMSK_UART2);
}
static void
s3c_irq_uart2_ack(unsigned int irqno)
{
s3c_irqsub_maskack(irqno, INTMSK_UART2, 7 << 6);
}
static struct irq_chip s3c_irq_uart2 = {
.name = "s3c-uart2",
.mask = s3c_irq_uart2_mask,
.unmask = s3c_irq_uart2_unmask,
.ack = s3c_irq_uart2_ack,
};
/* ADC and Touchscreen */
static void
s3c_irq_adc_mask(unsigned int irqno)
{
s3c_irqsub_mask(irqno, INTMSK_ADCPARENT, 3 << 9);
}
static void
s3c_irq_adc_unmask(unsigned int irqno)
{
s3c_irqsub_unmask(irqno, INTMSK_ADCPARENT);
}
static void
s3c_irq_adc_ack(unsigned int irqno)
{
s3c_irqsub_ack(irqno, INTMSK_ADCPARENT, 3 << 9);
}
static struct irq_chip s3c_irq_adc = {
.name = "s3c-adc",
.mask = s3c_irq_adc_mask,
.unmask = s3c_irq_adc_unmask,
.ack = s3c_irq_adc_ack,
};
/* irq demux for adc */
static void s3c_irq_demux_adc(unsigned int irq,
struct irq_desc *desc)
{
unsigned int subsrc, submsk;
unsigned int offset = 9;
/* read the current pending interrupts, and the mask
* for what it is available */
subsrc = __raw_readl(S3C2410_SUBSRCPND);
submsk = __raw_readl(S3C2410_INTSUBMSK);
subsrc &= ~submsk;
subsrc >>= offset;
subsrc &= 3;
if (subsrc != 0) {
if (subsrc & 1) {
generic_handle_irq(IRQ_TC);
}
if (subsrc & 2) {
generic_handle_irq(IRQ_ADC);
}
}
}
static void s3c_irq_demux_uart(unsigned int start)
{
unsigned int subsrc, submsk;
unsigned int offset = start - IRQ_S3CUART_RX0;
/* read the current pending interrupts, and the mask
* for what it is available */
subsrc = __raw_readl(S3C2410_SUBSRCPND);
submsk = __raw_readl(S3C2410_INTSUBMSK);
irqdbf2("s3c_irq_demux_uart: start=%d (%d), subsrc=0x%08x,0x%08x\n",
start, offset, subsrc, submsk);
subsrc &= ~submsk;
subsrc >>= offset;
subsrc &= 7;
if (subsrc != 0) {
if (subsrc & 1)
generic_handle_irq(start);
if (subsrc & 2)
generic_handle_irq(start+1);
if (subsrc & 4)
generic_handle_irq(start+2);
}
}
/* uart demux entry points */
static void
s3c_irq_demux_uart0(unsigned int irq,
struct irq_desc *desc)
{
irq = irq;
s3c_irq_demux_uart(IRQ_S3CUART_RX0);
}
static void
s3c_irq_demux_uart1(unsigned int irq,
struct irq_desc *desc)
{
irq = irq;
s3c_irq_demux_uart(IRQ_S3CUART_RX1);
}
static void
s3c_irq_demux_uart2(unsigned int irq,
struct irq_desc *desc)
{
irq = irq;
s3c_irq_demux_uart(IRQ_S3CUART_RX2);
}
static void
s3c_irq_demux_extint8(unsigned int irq,
struct irq_desc *desc)
{
unsigned long eintpnd = __raw_readl(S3C24XX_EINTPEND);
unsigned long eintmsk = __raw_readl(S3C24XX_EINTMASK);
eintpnd &= ~eintmsk;
eintpnd &= ~0xff; /* ignore lower irqs */
/* we may as well handle all the pending IRQs here */
while (eintpnd) {
irq = __ffs(eintpnd);
eintpnd &= ~(1<<irq);
irq += (IRQ_EINT4 - 4);
generic_handle_irq(irq);
}
}
static void
s3c_irq_demux_extint4t7(unsigned int irq,
struct irq_desc *desc)
{
unsigned long eintpnd = __raw_readl(S3C24XX_EINTPEND);
unsigned long eintmsk = __raw_readl(S3C24XX_EINTMASK);
eintpnd &= ~eintmsk;
eintpnd &= 0xff; /* only lower irqs */
/* we may as well handle all the pending IRQs here */
while (eintpnd) {
irq = __ffs(eintpnd);
eintpnd &= ~(1<<irq);
irq += (IRQ_EINT4 - 4);
generic_handle_irq(irq);
}
}
#ifdef CONFIG_FIQ
/**
* s3c24xx_set_fiq - set the FIQ routing
* @irq: IRQ number to route to FIQ on processor.
* @on: Whether to route @irq to the FIQ, or to remove the FIQ routing.
*
* Change the state of the IRQ to FIQ routing depending on @irq and @on. If
* @on is true, the @irq is checked to see if it can be routed and the
* interrupt controller updated to route the IRQ. If @on is false, the FIQ
* routing is cleared, regardless of which @irq is specified.
*/
int s3c24xx_set_fiq(unsigned int irq, bool on)
{
u32 intmod;
unsigned offs;
if (on) {
offs = irq - FIQ_START;
if (offs > 31)
return -EINVAL;
intmod = 1 << offs;
} else {
intmod = 0;
}
__raw_writel(intmod, S3C2410_INTMOD);
return 0;
}
#endif
/* s3c24xx_init_irq
*
* Initialise S3C2410 IRQ system
*/
void __init s3c24xx_init_irq(void)
{
unsigned long pend;
unsigned long last;
int irqno;
int i;
#ifdef CONFIG_FIQ
init_FIQ();
#endif
irqdbf("s3c2410_init_irq: clearing interrupt status flags\n");
/* first, clear all interrupts pending... */
last = 0;
for (i = 0; i < 4; i++) {
pend = __raw_readl(S3C24XX_EINTPEND);
if (pend == 0 || pend == last)
break;
__raw_writel(pend, S3C24XX_EINTPEND);
printk("irq: clearing pending ext status %08x\n", (int)pend);
last = pend;
}
last = 0;
for (i = 0; i < 4; i++) {
pend = __raw_readl(S3C2410_INTPND);
if (pend == 0 || pend == last)
break;
__raw_writel(pend, S3C2410_SRCPND);
__raw_writel(pend, S3C2410_INTPND);
printk("irq: clearing pending status %08x\n", (int)pend);
last = pend;
}
last = 0;
for (i = 0; i < 4; i++) {
pend = __raw_readl(S3C2410_SUBSRCPND);
if (pend == 0 || pend == last)
break;
printk("irq: clearing subpending status %08x\n", (int)pend);
__raw_writel(pend, S3C2410_SUBSRCPND);
last = pend;
}
/* register the main interrupts */
irqdbf("s3c2410_init_irq: registering s3c2410 interrupt handlers\n");
for (irqno = IRQ_EINT4t7; irqno <= IRQ_ADCPARENT; irqno++) {
/* set all the s3c2410 internal irqs */
switch (irqno) {
/* deal with the special IRQs (cascaded) */
case IRQ_EINT4t7:
case IRQ_EINT8t23:
case IRQ_UART0:
case IRQ_UART1:
case IRQ_UART2:
case IRQ_ADCPARENT:
set_irq_chip(irqno, &s3c_irq_level_chip);
set_irq_handler(irqno, handle_level_irq);
break;
case IRQ_RESERVED6:
case IRQ_RESERVED24:
/* no IRQ here */
break;
default:
//irqdbf("registering irq %d (s3c irq)\n", irqno);
set_irq_chip(irqno, &s3c_irq_chip);
set_irq_handler(irqno, handle_edge_irq);
set_irq_flags(irqno, IRQF_VALID);
}
}
/* setup the cascade irq handlers */
set_irq_chained_handler(IRQ_EINT4t7, s3c_irq_demux_extint4t7);
set_irq_chained_handler(IRQ_EINT8t23, s3c_irq_demux_extint8);
set_irq_chained_handler(IRQ_UART0, s3c_irq_demux_uart0);
set_irq_chained_handler(IRQ_UART1, s3c_irq_demux_uart1);
set_irq_chained_handler(IRQ_UART2, s3c_irq_demux_uart2);
set_irq_chained_handler(IRQ_ADCPARENT, s3c_irq_demux_adc);
/* external interrupts */
for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) {
irqdbf("registering irq %d (ext int)\n", irqno);
set_irq_chip(irqno, &s3c_irq_eint0t4);
set_irq_handler(irqno, handle_edge_irq);
set_irq_flags(irqno, IRQF_VALID);
}
for (irqno = IRQ_EINT4; irqno <= IRQ_EINT23; irqno++) {
irqdbf("registering irq %d (extended s3c irq)\n", irqno);
set_irq_chip(irqno, &s3c_irqext_chip);
set_irq_handler(irqno, handle_edge_irq);
set_irq_flags(irqno, IRQF_VALID);
}
/* register the uart interrupts */
irqdbf("s3c2410: registering external interrupts\n");
for (irqno = IRQ_S3CUART_RX0; irqno <= IRQ_S3CUART_ERR0; irqno++) {
irqdbf("registering irq %d (s3c uart0 irq)\n", irqno);
set_irq_chip(irqno, &s3c_irq_uart0);
set_irq_handler(irqno, handle_level_irq);
set_irq_flags(irqno, IRQF_VALID);
}
for (irqno = IRQ_S3CUART_RX1; irqno <= IRQ_S3CUART_ERR1; irqno++) {
irqdbf("registering irq %d (s3c uart1 irq)\n", irqno);
set_irq_chip(irqno, &s3c_irq_uart1);
set_irq_handler(irqno, handle_level_irq);
set_irq_flags(irqno, IRQF_VALID);
}
for (irqno = IRQ_S3CUART_RX2; irqno <= IRQ_S3CUART_ERR2; irqno++) {
irqdbf("registering irq %d (s3c uart2 irq)\n", irqno);
set_irq_chip(irqno, &s3c_irq_uart2);
set_irq_handler(irqno, handle_level_irq);
set_irq_flags(irqno, IRQF_VALID);
}
for (irqno = IRQ_TC; irqno <= IRQ_ADC; irqno++) {
irqdbf("registering irq %d (s3c adc irq)\n", irqno);
set_irq_chip(irqno, &s3c_irq_adc);
set_irq_handler(irqno, handle_edge_irq);
set_irq_flags(irqno, IRQF_VALID);
}
irqdbf("s3c2410: registered interrupt handlers\n");
}
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