linux/arch/arm/mach-s3c2412/irq.c
Ben Dooks 0baada2742 [ARM] 4730/1: S3C2412: Ensure the PWRCFG has the right mode for RTC wake
Ensure that if the RTC IRQ is not selected for wake in the
base configuration, then the PWRCFG has the same value set
in it.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-01-28 13:20:50 +00:00

214 lines
5.5 KiB
C

/* linux/arch/arm/mach-s3c2412/irq.c
*
* Copyright (c) 2006 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/hardware.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/mach/irq.h>
#include <asm/arch/regs-irq.h>
#include <asm/arch/regs-gpio.h>
#include <asm/arch/regs-power.h>
#include <asm/plat-s3c24xx/cpu.h>
#include <asm/plat-s3c24xx/irq.h>
#include <asm/plat-s3c24xx/pm.h>
#define INTMSK(start, end) ((1 << ((end) + 1 - (start))) - 1)
#define INTMSK_SUB(start, end) (INTMSK(start, end) << ((start - S3C2410_IRQSUB(0))))
/* the s3c2412 changes the behaviour of IRQ_EINT0 through IRQ_EINT3 by
* having them turn up in both the INT* and the EINT* registers. Whilst
* both show the status, they both now need to be acked when the IRQs
* go off.
*/
static void
s3c2412_irq_mask(unsigned int irqno)
{
unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
unsigned long mask;
mask = __raw_readl(S3C2410_INTMSK);
__raw_writel(mask | bitval, S3C2410_INTMSK);
mask = __raw_readl(S3C2412_EINTMASK);
__raw_writel(mask | bitval, S3C2412_EINTMASK);
}
static inline void
s3c2412_irq_ack(unsigned int irqno)
{
unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
__raw_writel(bitval, S3C2412_EINTPEND);
__raw_writel(bitval, S3C2410_SRCPND);
__raw_writel(bitval, S3C2410_INTPND);
}
static inline void
s3c2412_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);
mask = __raw_readl(S3C2412_EINTMASK);
__raw_writel(mask | bitval, S3C2412_EINTMASK);
__raw_writel(bitval, S3C2412_EINTPEND);
__raw_writel(bitval, S3C2410_SRCPND);
__raw_writel(bitval, S3C2410_INTPND);
}
static void
s3c2412_irq_unmask(unsigned int irqno)
{
unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
unsigned long mask;
mask = __raw_readl(S3C2412_EINTMASK);
__raw_writel(mask & ~bitval, S3C2412_EINTMASK);
mask = __raw_readl(S3C2410_INTMSK);
__raw_writel(mask & ~bitval, S3C2410_INTMSK);
}
static struct irq_chip s3c2412_irq_eint0t4 = {
.ack = s3c2412_irq_ack,
.mask = s3c2412_irq_mask,
.unmask = s3c2412_irq_unmask,
.set_wake = s3c_irq_wake,
.set_type = s3c_irqext_type,
};
#define INTBIT(x) (1 << ((x) - S3C2410_IRQSUB(0)))
/* CF and SDI sub interrupts */
static void s3c2412_irq_demux_cfsdi(unsigned int irq, struct irq_desc *desc)
{
unsigned int subsrc, submsk;
subsrc = __raw_readl(S3C2410_SUBSRCPND);
submsk = __raw_readl(S3C2410_INTSUBMSK);
subsrc &= ~submsk;
if (subsrc & INTBIT(IRQ_S3C2412_SDI))
desc_handle_irq(IRQ_S3C2412_SDI, irq_desc + IRQ_S3C2412_SDI);
if (subsrc & INTBIT(IRQ_S3C2412_CF))
desc_handle_irq(IRQ_S3C2412_CF, irq_desc + IRQ_S3C2412_CF);
}
#define INTMSK_CFSDI (1UL << (IRQ_S3C2412_CFSDI - IRQ_EINT0))
#define SUBMSK_CFSDI INTMSK_SUB(IRQ_S3C2412_SDI, IRQ_S3C2412_CF)
static void s3c2412_irq_cfsdi_mask(unsigned int irqno)
{
s3c_irqsub_mask(irqno, INTMSK_CFSDI, SUBMSK_CFSDI);
}
static void s3c2412_irq_cfsdi_unmask(unsigned int irqno)
{
s3c_irqsub_unmask(irqno, INTMSK_CFSDI);
}
static void s3c2412_irq_cfsdi_ack(unsigned int irqno)
{
s3c_irqsub_maskack(irqno, INTMSK_CFSDI, SUBMSK_CFSDI);
}
static struct irq_chip s3c2412_irq_cfsdi = {
.name = "s3c2412-cfsdi",
.ack = s3c2412_irq_cfsdi_ack,
.mask = s3c2412_irq_cfsdi_mask,
.unmask = s3c2412_irq_cfsdi_unmask,
};
static int s3c2412_irq_rtc_wake(unsigned int irqno, unsigned int state)
{
unsigned long pwrcfg;
pwrcfg = __raw_readl(S3C2412_PWRCFG);
if (state)
pwrcfg &= ~S3C2412_PWRCFG_RTC_MASKIRQ;
else
pwrcfg |= S3C2412_PWRCFG_RTC_MASKIRQ;
__raw_writel(pwrcfg, S3C2412_PWRCFG);
return s3c_irq_chip.set_wake(irqno, state);
}
static struct irq_chip s3c2412_irq_rtc_chip;
static int s3c2412_irq_add(struct sys_device *sysdev)
{
unsigned int irqno;
for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) {
set_irq_chip(irqno, &s3c2412_irq_eint0t4);
set_irq_handler(irqno, handle_edge_irq);
set_irq_flags(irqno, IRQF_VALID);
}
/* add demux support for CF/SDI */
set_irq_chained_handler(IRQ_S3C2412_CFSDI, s3c2412_irq_demux_cfsdi);
for (irqno = IRQ_S3C2412_SDI; irqno <= IRQ_S3C2412_CF; irqno++) {
set_irq_chip(irqno, &s3c2412_irq_cfsdi);
set_irq_handler(irqno, handle_level_irq);
set_irq_flags(irqno, IRQF_VALID);
}
/* change RTC IRQ's set wake method */
s3c2412_irq_rtc_chip = s3c_irq_chip;
s3c2412_irq_rtc_chip.set_wake = s3c2412_irq_rtc_wake;
set_irq_chip(IRQ_RTC, &s3c2412_irq_rtc_chip);
return 0;
}
static struct sysdev_driver s3c2412_irq_driver = {
.add = s3c2412_irq_add,
.suspend = s3c24xx_irq_suspend,
.resume = s3c24xx_irq_resume,
};
static int s3c2412_irq_init(void)
{
return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_irq_driver);
}
arch_initcall(s3c2412_irq_init);