linux/arch/arm/mach-s3c2412/irq.c
Rafael J. Wysocki bb072c3cf2 ARM / Samsung: Use struct syscore_ops for "core" power management
Replace sysdev classes and struct sys_device objects used for "core"
power management by Samsung platforms with struct syscore_ops objects
that are simpler.

This generally reduces the code size and the kernel memory footprint.
It also is necessary for removing sysdevs entirely from the kernel in
the future.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
2011-04-24 19:16:10 +02:00

213 lines
5.4 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 <linux/io.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <mach/regs-irq.h>
#include <mach/regs-gpio.h>
#include <mach/regs-power.h>
#include <plat/cpu.h>
#include <plat/irq.h>
#include <plat/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(struct irq_data *data)
{
unsigned long bitval = 1UL << (data->irq - 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(struct irq_data *data)
{
unsigned long bitval = 1UL << (data->irq - IRQ_EINT0);
__raw_writel(bitval, S3C2412_EINTPEND);
__raw_writel(bitval, S3C2410_SRCPND);
__raw_writel(bitval, S3C2410_INTPND);
}
static inline void
s3c2412_irq_maskack(struct irq_data *data)
{
unsigned long bitval = 1UL << (data->irq - 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(struct irq_data *data)
{
unsigned long bitval = 1UL << (data->irq - 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 = {
.irq_ack = s3c2412_irq_ack,
.irq_mask = s3c2412_irq_mask,
.irq_unmask = s3c2412_irq_unmask,
.irq_set_wake = s3c_irq_wake,
.irq_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))
generic_handle_irq(IRQ_S3C2412_SDI);
if (subsrc & INTBIT(IRQ_S3C2412_CF))
generic_handle_irq(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(struct irq_data *data)
{
s3c_irqsub_mask(data->irq, INTMSK_CFSDI, SUBMSK_CFSDI);
}
static void s3c2412_irq_cfsdi_unmask(struct irq_data *data)
{
s3c_irqsub_unmask(data->irq, INTMSK_CFSDI);
}
static void s3c2412_irq_cfsdi_ack(struct irq_data *data)
{
s3c_irqsub_maskack(data->irq, INTMSK_CFSDI, SUBMSK_CFSDI);
}
static struct irq_chip s3c2412_irq_cfsdi = {
.name = "s3c2412-cfsdi",
.irq_ack = s3c2412_irq_cfsdi_ack,
.irq_mask = s3c2412_irq_cfsdi_mask,
.irq_unmask = s3c2412_irq_cfsdi_unmask,
};
static int s3c2412_irq_rtc_wake(struct irq_data *data, 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.irq_set_wake(data, 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++) {
irq_set_chip_and_handler(irqno, &s3c2412_irq_eint0t4,
handle_edge_irq);
set_irq_flags(irqno, IRQF_VALID);
}
/* add demux support for CF/SDI */
irq_set_chained_handler(IRQ_S3C2412_CFSDI, s3c2412_irq_demux_cfsdi);
for (irqno = IRQ_S3C2412_SDI; irqno <= IRQ_S3C2412_CF; irqno++) {
irq_set_chip_and_handler(irqno, &s3c2412_irq_cfsdi,
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.irq_set_wake = s3c2412_irq_rtc_wake;
irq_set_chip(IRQ_RTC, &s3c2412_irq_rtc_chip);
return 0;
}
static struct sysdev_driver s3c2412_irq_driver = {
.add = s3c2412_irq_add,
};
static int s3c2412_irq_init(void)
{
return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_irq_driver);
}
arch_initcall(s3c2412_irq_init);