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[ARM] S3C64XX: Add IRQ_EINT support 

Add the necessary code to support IRQ_EINT(x) on
the S3C64XX series of CPUs.

Note, since there is no GPIO configuration support
in the kernel, the irq set_type method does not
configure the relevant pin to interrupt.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Ben Dooks 2008-10-21 14:07:08 +01:00
parent 94df868b88
commit 80789e7915
3 changed files with 205 additions and 1 deletions
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1
arch/arm/plat-s3c64xx/Makefile
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@ -15,6 +15,7 @@ obj- :=
obj-y += dev-uart.o
obj-y += cpu.o
obj-y += irq.o
obj-y += irq-eint.o
obj-y += clock.o
# CPU support

3
arch/arm/plat-s3c64xx/include/plat/irqs.h
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@ -150,7 +150,8 @@
#define S3C_IRQ_EINT_BASE S3C_IRQ(64+5)
#define S3C_EINT(x) ((x) + S3C_IRQ_EINT_BASE)
#define S3C_EINT(x) ((x) + S3C_IRQ_EINT_BASE)
#define IRQ_EINT(x) S3C_EINT(x)
/* Define NR_IRQs here, machine specific can always re-define.
* Currently the IRQ_EINT27 is the last one we can have. */

202
arch/arm/plat-s3c64xx/irq-eint.c Normal file
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@ -0,0 +1,202 @@
/* arch/arm/plat-s3c64xx/irq-eint.c
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C64XX - Interrupt handling for IRQ_EINT(x)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/hardware/vic.h>
#include <plat/regs-irqtype.h>
#include <mach/map.h>
#include <plat/cpu.h>
/* GPIO is 0x7F008xxx, */
#define S3C64XX_GPIOREG(x) (S3C64XX_VA_GPIO + (x))
#define S3C64XX_EINT0CON0 S3C64XX_GPIOREG(0x900)
#define S3C64XX_EINT0CON1 S3C64XX_GPIOREG(0x904)
#define S3C64XX_EINT0FLTCON0 S3C64XX_GPIOREG(0x910)
#define S3C64XX_EINT0FLTCON1 S3C64XX_GPIOREG(0x914)
#define S3C64XX_EINT0FLTCON2 S3C64XX_GPIOREG(0x918)
#define S3C64XX_EINT0FLTCON3 S3C64XX_GPIOREG(0x91C)
#define S3C64XX_EINT0MASK S3C64XX_GPIOREG(0x920)
#define S3C64XX_EINT0PEND S3C64XX_GPIOREG(0x924)
#define eint_offset(irq) ((irq) - IRQ_EINT(0))
#define eint_irq_to_bit(irq) (1 << eint_offset(irq))
static inline void s3c_irq_eint_mask(unsigned int irq)
{
u32 mask;
mask = __raw_readl(S3C64XX_EINT0MASK);
mask |= eint_irq_to_bit(irq);
__raw_writel(mask, S3C64XX_EINT0MASK);
}
static void s3c_irq_eint_unmask(unsigned int irq)
{
u32 mask;
mask = __raw_readl(S3C64XX_EINT0MASK);
mask |= eint_irq_to_bit(irq);
__raw_writel(mask, S3C64XX_EINT0MASK);
}
static inline void s3c_irq_eint_ack(unsigned int irq)
{
__raw_writel(eint_irq_to_bit(irq), S3C64XX_EINT0PEND);
}
static void s3c_irq_eint_maskack(unsigned int irq)
{
/* compiler should in-line these */
s3c_irq_eint_mask(irq);
s3c_irq_eint_ack(irq);
}
static int s3c_irq_eint_set_type(unsigned int irq, unsigned int type)
{
int offs = eint_offset(irq);
int shift;
u32 ctrl, mask;
u32 newvalue = 0;
void __iomem *reg;
if (offs > 27)
return -EINVAL;
if (offs > 15)
reg = S3C64XX_EINT0CON0;
else
reg = S3C64XX_EINT0CON1;
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;
}
shift = (offs / 2) * 4;
mask = 0x7 << shift;
ctrl = __raw_readl(reg);
ctrl &= ~mask;
ctrl |= newvalue << shift;
__raw_writel(ctrl, reg);
return 0;
}
static struct irq_chip s3c_irq_eint = {
.name = "s3c-eint",
.mask = s3c_irq_eint_mask,
.unmask = s3c_irq_eint_unmask,
.mask_ack = s3c_irq_eint_maskack,
.ack = s3c_irq_eint_ack,
.set_type = s3c_irq_eint_set_type,
};
/* s3c_irq_demux_eint
*
* This function demuxes the IRQ from the group0 external interrupts,
* from IRQ_EINT(0) to IRQ_EINT(27). It is designed to be inlined into
* the specific handlers s3c_irq_demux_eintX_Y.
*/
static inline void s3c_irq_demux_eint(unsigned int start, unsigned int end)
{
u32 status = __raw_readl(S3C64XX_EINT0PEND);
u32 mask = __raw_readl(S3C64XX_EINT0MASK);
unsigned int irq;
status &= ~mask;
status >>= start;
status &= (1 << (end - start + 1)) - 1;
for (irq = IRQ_EINT(start); irq <= IRQ_EINT(end); irq++) {
if (status & 1)
generic_handle_irq(irq);
status >>= 1;
}
}
static void s3c_irq_demux_eint0_3(unsigned int irq, struct irq_desc *desc)
{
s3c_irq_demux_eint(0, 3);
}
static void s3c_irq_demux_eint4_11(unsigned int irq, struct irq_desc *desc)
{
s3c_irq_demux_eint(4, 11);
}
static void s3c_irq_demux_eint12_19(unsigned int irq, struct irq_desc *desc)
{
s3c_irq_demux_eint(12, 19);
}
static void s3c_irq_demux_eint20_27(unsigned int irq, struct irq_desc *desc)
{
s3c_irq_demux_eint(20, 27);
}
int __init s3c64xx_init_irq_eint(void)
{
int irq;
for (irq = IRQ_EINT(0); irq <= IRQ_EINT(27); irq++) {
set_irq_chip(irq, &s3c_irq_eint);
set_irq_handler(irq, handle_level_irq);
set_irq_flags(irq, IRQF_VALID);
}
set_irq_chained_handler(IRQ_EINT0_3, s3c_irq_demux_eint0_3);
set_irq_chained_handler(IRQ_EINT4_11, s3c_irq_demux_eint4_11);
set_irq_chained_handler(IRQ_EINT12_19, s3c_irq_demux_eint12_19);
set_irq_chained_handler(IRQ_EINT20_27, s3c_irq_demux_eint20_27);
return 0;
}
arch_initcall(s3c64xx_init_irq_eint);