/* arch/arm/mach-s5p64x0/irq-eint.c
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd
* http://www.samsung.com/
*
* Based on linux/arch/arm/mach-s3c64xx/irq-eint.c
*
* S5P64X0 - Interrupt handling for External Interrupts.
*
* 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/gpio.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <plat/regs-irqtype.h>
#include <plat/gpio-cfg.h>
#include <mach/regs-gpio.h>
#include <mach/regs-clock.h>
#define eint_offset(irq) ((irq) - IRQ_EINT(0))
static int s5p64x0_irq_eint_set_type(struct irq_data *data, unsigned int type)
{
int offs = eint_offset(data->irq);
int shift;
u32 ctrl, mask;
u32 newvalue = 0;
if (offs > 15)
return -EINVAL;
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 -EINVAL;
}
shift = (offs / 2) * 4;
mask = 0x7 << shift;
ctrl = __raw_readl(S5P64X0_EINT0CON0) & ~mask;
ctrl |= newvalue << shift;
__raw_writel(ctrl, S5P64X0_EINT0CON0);
/* Configure the GPIO pin for 6450 or 6440 based on CPU ID */
if (0x50000 == (__raw_readl(S5P64X0_SYS_ID) & 0xFF000))
s3c_gpio_cfgpin(S5P6450_GPN(offs), S3C_GPIO_SFN(2));
else
s3c_gpio_cfgpin(S5P6440_GPN(offs), S3C_GPIO_SFN(2));
return 0;
}
/*
* s5p64x0_irq_demux_eint
*
* This function demuxes the IRQ from the group0 external interrupts,
* from IRQ_EINT(0) to IRQ_EINT(15). It is designed to be inlined into
* the specific handlers s5p64x0_irq_demux_eintX_Y.
*/
static inline void s5p64x0_irq_demux_eint(unsigned int start, unsigned int end)
{
u32 status = __raw_readl(S5P64X0_EINT0PEND);
u32 mask = __raw_readl(S5P64X0_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 s5p64x0_irq_demux_eint0_3(unsigned int irq, struct irq_desc *desc)
{
s5p64x0_irq_demux_eint(0, 3);
}
static void s5p64x0_irq_demux_eint4_11(unsigned int irq, struct irq_desc *desc)
{
s5p64x0_irq_demux_eint(4, 11);
}
static void s5p64x0_irq_demux_eint12_15(unsigned int irq,
struct irq_desc *desc)
{
s5p64x0_irq_demux_eint(12, 15);
}
static int s5p64x0_alloc_gc(void)
{
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
gc = irq_alloc_generic_chip("s5p64x0-eint", 1, S5P_IRQ_EINT_BASE,
S5P_VA_GPIO, handle_level_irq);
if (!gc) {
printk(KERN_ERR "%s: irq_alloc_generic_chip for group 0"
"external interrupts failed\n", __func__);
return -EINVAL;
}
ct = gc->chip_types;
ct->chip.irq_ack = irq_gc_ack_set_bit;
ct->chip.irq_mask = irq_gc_mask_set_bit;
ct->chip.irq_unmask = irq_gc_mask_clr_bit;
ct->chip.irq_set_type = s5p64x0_irq_eint_set_type;
ct->regs.ack = EINT0PEND_OFFSET;
ct->regs.mask = EINT0MASK_OFFSET;
irq_setup_generic_chip(gc, IRQ_MSK(16), IRQ_GC_INIT_MASK_CACHE,
IRQ_NOREQUEST | IRQ_NOPROBE, 0);
return 0;
}
static int __init s5p64x0_init_irq_eint(void)
{
int ret = s5p64x0_alloc_gc();
irq_set_chained_handler(IRQ_EINT0_3, s5p64x0_irq_demux_eint0_3);
irq_set_chained_handler(IRQ_EINT4_11, s5p64x0_irq_demux_eint4_11);
irq_set_chained_handler(IRQ_EINT12_15, s5p64x0_irq_demux_eint12_15);
return ret;
}
arch_initcall(s5p64x0_init_irq_eint);
