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linux-sg2042/arch/arm/mach-s3c24xx/irq-s3c2416.c

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/* linux/arch/arm/mach-s3c2416/irq.c
*
* Copyright (c) 2009 Yauhen Kharuzhy <jekhor@gmail.com>,
* as part of OpenInkpot project
* Copyright (c) 2009 Promwad Innovation Company
* Yauhen Kharuzhy <yauhen.kharuzhy@promwad.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
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/syscore_ops.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 <plat/cpu.h>
#include <plat/pm.h>
#include <plat/irq.h>
#define INTMSK(start, end) ((1 << ((end) + 1 - (start))) - 1)
static inline void s3c2416_irq_demux(unsigned int irq, unsigned int len)
{
unsigned int subsrc, submsk;
unsigned int end;
/* 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 >>= (irq - S3C2410_IRQSUB(0));
subsrc &= (1 << len)-1;
end = len + irq;
for (; irq < end && subsrc; irq++) {
if (subsrc & 1)
generic_handle_irq(irq);
subsrc >>= 1;
}
}
/* WDT/AC97 sub interrupts */
static void s3c2416_irq_demux_wdtac97(unsigned int irq, struct irq_desc *desc)
{
s3c2416_irq_demux(IRQ_S3C2443_WDT, 4);
}
#define INTMSK_WDTAC97 (1UL << (IRQ_WDT - IRQ_EINT0))
#define SUBMSK_WDTAC97 INTMSK(IRQ_S3C2443_WDT, IRQ_S3C2443_AC97)
static void s3c2416_irq_wdtac97_mask(struct irq_data *data)
{
s3c_irqsub_mask(data->irq, INTMSK_WDTAC97, SUBMSK_WDTAC97);
}
static void s3c2416_irq_wdtac97_unmask(struct irq_data *data)
{
s3c_irqsub_unmask(data->irq, INTMSK_WDTAC97);
}
static void s3c2416_irq_wdtac97_ack(struct irq_data *data)
{
s3c_irqsub_maskack(data->irq, INTMSK_WDTAC97, SUBMSK_WDTAC97);
}
static struct irq_chip s3c2416_irq_wdtac97 = {
.irq_mask = s3c2416_irq_wdtac97_mask,
.irq_unmask = s3c2416_irq_wdtac97_unmask,
.irq_ack = s3c2416_irq_wdtac97_ack,
};
/* LCD sub interrupts */
static void s3c2416_irq_demux_lcd(unsigned int irq, struct irq_desc *desc)
{
s3c2416_irq_demux(IRQ_S3C2443_LCD1, 4);
}
#define INTMSK_LCD (1UL << (IRQ_LCD - IRQ_EINT0))
#define SUBMSK_LCD INTMSK(IRQ_S3C2443_LCD1, IRQ_S3C2443_LCD4)
static void s3c2416_irq_lcd_mask(struct irq_data *data)
{
s3c_irqsub_mask(data->irq, INTMSK_LCD, SUBMSK_LCD);
}
static void s3c2416_irq_lcd_unmask(struct irq_data *data)
{
s3c_irqsub_unmask(data->irq, INTMSK_LCD);
}
static void s3c2416_irq_lcd_ack(struct irq_data *data)
{
s3c_irqsub_maskack(data->irq, INTMSK_LCD, SUBMSK_LCD);
}
static struct irq_chip s3c2416_irq_lcd = {
.irq_mask = s3c2416_irq_lcd_mask,
.irq_unmask = s3c2416_irq_lcd_unmask,
.irq_ack = s3c2416_irq_lcd_ack,
};
/* DMA sub interrupts */
static void s3c2416_irq_demux_dma(unsigned int irq, struct irq_desc *desc)
{
s3c2416_irq_demux(IRQ_S3C2443_DMA0, 6);
}
#define INTMSK_DMA (1UL << (IRQ_S3C2443_DMA - IRQ_EINT0))
#define SUBMSK_DMA INTMSK(IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5)
static void s3c2416_irq_dma_mask(struct irq_data *data)
{
s3c_irqsub_mask(data->irq, INTMSK_DMA, SUBMSK_DMA);
}
static void s3c2416_irq_dma_unmask(struct irq_data *data)
{
s3c_irqsub_unmask(data->irq, INTMSK_DMA);
}
static void s3c2416_irq_dma_ack(struct irq_data *data)
{
s3c_irqsub_maskack(data->irq, INTMSK_DMA, SUBMSK_DMA);
}
static struct irq_chip s3c2416_irq_dma = {
.irq_mask = s3c2416_irq_dma_mask,
.irq_unmask = s3c2416_irq_dma_unmask,
.irq_ack = s3c2416_irq_dma_ack,
};
/* UART3 sub interrupts */
static void s3c2416_irq_demux_uart3(unsigned int irq, struct irq_desc *desc)
{
s3c2416_irq_demux(IRQ_S3C2443_RX3, 3);
}
#define INTMSK_UART3 (1UL << (IRQ_S3C2443_UART3 - IRQ_EINT0))
#define SUBMSK_UART3 (0x7 << (IRQ_S3C2443_RX3 - S3C2410_IRQSUB(0)))
static void s3c2416_irq_uart3_mask(struct irq_data *data)
{
s3c_irqsub_mask(data->irq, INTMSK_UART3, SUBMSK_UART3);
}
static void s3c2416_irq_uart3_unmask(struct irq_data *data)
{
s3c_irqsub_unmask(data->irq, INTMSK_UART3);
}
static void s3c2416_irq_uart3_ack(struct irq_data *data)
{
s3c_irqsub_maskack(data->irq, INTMSK_UART3, SUBMSK_UART3);
}
static struct irq_chip s3c2416_irq_uart3 = {
.irq_mask = s3c2416_irq_uart3_mask,
.irq_unmask = s3c2416_irq_uart3_unmask,
.irq_ack = s3c2416_irq_uart3_ack,
};
/* second interrupt register */
static inline void s3c2416_irq_ack_second(struct irq_data *data)
{
unsigned long bitval = 1UL << (data->irq - IRQ_S3C2416_2D);
__raw_writel(bitval, S3C2416_SRCPND2);
__raw_writel(bitval, S3C2416_INTPND2);
}
static void s3c2416_irq_mask_second(struct irq_data *data)
{
unsigned long bitval = 1UL << (data->irq - IRQ_S3C2416_2D);
unsigned long mask;
mask = __raw_readl(S3C2416_INTMSK2);
mask |= bitval;
__raw_writel(mask, S3C2416_INTMSK2);
}
static void s3c2416_irq_unmask_second(struct irq_data *data)
{
unsigned long bitval = 1UL << (data->irq - IRQ_S3C2416_2D);
unsigned long mask;
mask = __raw_readl(S3C2416_INTMSK2);
mask &= ~bitval;
__raw_writel(mask, S3C2416_INTMSK2);
}
struct irq_chip s3c2416_irq_second = {
.irq_ack = s3c2416_irq_ack_second,
.irq_mask = s3c2416_irq_mask_second,
.irq_unmask = s3c2416_irq_unmask_second,
};
/* IRQ initialisation code */
static int s3c2416_add_sub(unsigned int base,
void (*demux)(unsigned int,
struct irq_desc *),
struct irq_chip *chip,
unsigned int start, unsigned int end)
{
unsigned int irqno;
irq_set_chip_and_handler(base, &s3c_irq_level_chip, handle_level_irq);
irq_set_chained_handler(base, demux);
for (irqno = start; irqno <= end; irqno++) {
irq_set_chip_and_handler(irqno, chip, handle_level_irq);
set_irq_flags(irqno, IRQF_VALID);
}
return 0;
}
static void s3c2416_irq_add_second(void)
{
unsigned long pend;
unsigned long last;
int irqno;
int i;
/* first, clear all interrupts pending... */
last = 0;
for (i = 0; i < 4; i++) {
pend = __raw_readl(S3C2416_INTPND2);
if (pend == 0 || pend == last)
break;
__raw_writel(pend, S3C2416_SRCPND2);
__raw_writel(pend, S3C2416_INTPND2);
printk(KERN_INFO "irq: clearing pending status %08x\n",
(int)pend);
last = pend;
}
for (irqno = IRQ_S3C2416_2D; irqno <= IRQ_S3C2416_I2S1; irqno++) {
switch (irqno) {
case IRQ_S3C2416_RESERVED2:
case IRQ_S3C2416_RESERVED3:
/* no IRQ here */
break;
default:
irq_set_chip_and_handler(irqno, &s3c2416_irq_second,
handle_edge_irq);
set_irq_flags(irqno, IRQF_VALID);
}
}
}
static int s3c2416_irq_add(struct device *dev,
struct subsys_interface *sif)
{
printk(KERN_INFO "S3C2416: IRQ Support\n");
s3c2416_add_sub(IRQ_LCD, s3c2416_irq_demux_lcd, &s3c2416_irq_lcd,
IRQ_S3C2443_LCD2, IRQ_S3C2443_LCD4);
s3c2416_add_sub(IRQ_S3C2443_DMA, s3c2416_irq_demux_dma,
&s3c2416_irq_dma, IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5);
s3c2416_add_sub(IRQ_S3C2443_UART3, s3c2416_irq_demux_uart3,
&s3c2416_irq_uart3,
IRQ_S3C2443_RX3, IRQ_S3C2443_ERR3);
s3c2416_add_sub(IRQ_WDT, s3c2416_irq_demux_wdtac97,
&s3c2416_irq_wdtac97,
IRQ_S3C2443_WDT, IRQ_S3C2443_AC97);
s3c2416_irq_add_second();
return 0;
}
static struct subsys_interface s3c2416_irq_interface = {
.name = "s3c2416_irq",
.subsys = &s3c2416_subsys,
.add_dev = s3c2416_irq_add,
};
static int __init s3c2416_irq_init(void)
{
return subsys_interface_register(&s3c2416_irq_interface);
}
arch_initcall(s3c2416_irq_init);
#ifdef CONFIG_PM
static struct sleep_save irq_save[] = {
SAVE_ITEM(S3C2416_INTMSK2),
};
int s3c2416_irq_suspend(void)
{
s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
return 0;
}
void s3c2416_irq_resume(void)
{
s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
}
struct syscore_ops s3c2416_irq_syscore_ops = {
.suspend = s3c2416_irq_suspend,
.resume = s3c2416_irq_resume,
};
#endif
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