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/*
* Interrupt handling for INTC2-based IRQ.
*
* Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
* Copyright (C) 2005, 2006 Paul Mundt (lethal@linux-sh.org)
*
* May be copied or modified under the terms of the GNU General Public
* License. See linux/COPYING for more information.
*
* These are the "new Hitachi style" interrupts, as present on the
* Hitachi 7751, the STM ST40 STB1, SH7760, and SH7780.
*/
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/io.h>
static inline struct intc2_desc *get_intc2_desc(unsigned int irq)
{
struct irq_chip *chip = get_irq_chip(irq);
return (void *)((char *)chip - offsetof(struct intc2_desc, chip));
}
static void disable_intc2_irq(unsigned int irq)
{
struct intc2_data *p = get_irq_chip_data(irq);
struct intc2_desc *d = get_intc2_desc(irq);
ctrl_outl(1 << p->msk_shift, d->msk_base + p->msk_offset);
}
static void enable_intc2_irq(unsigned int irq)
{
struct intc2_data *p = get_irq_chip_data(irq);
struct intc2_desc *d = get_intc2_desc(irq);
ctrl_outl(1 << p->msk_shift, d->mskclr_base + p->msk_offset);
}
/*
* Setup an INTC2 style interrupt.
* NOTE: Unlike IPR interrupts, parameters are not shifted by this code,
* allowing the use of the numbers straight out of the datasheet.
* For example:
* PIO1 which is INTPRI00[19,16] and INTMSK00[13]
* would be: ^ ^ ^ ^
* | | | |
* { 84, 0, 16, 0, 13 },
*
* in the intc2_data table.
*/
void register_intc2_controller(struct intc2_desc *desc)
{
int i;
desc->chip.mask = disable_intc2_irq;
desc->chip.unmask = enable_intc2_irq;
desc->chip.mask_ack = disable_intc2_irq;
for (i = 0; i < desc->nr_irqs; i++) {
unsigned long ipr, flags;
struct intc2_data *p = desc->intc2_data + i;
disable_irq_nosync(p->irq);
if (desc->prio_base) {
/* Set the priority level */
local_irq_save(flags);
ipr = ctrl_inl(desc->prio_base + p->ipr_offset);
ipr &= ~(0xf << p->ipr_shift);
ipr |= p->priority << p->ipr_shift;
ctrl_outl(ipr, desc->prio_base + p->ipr_offset);
local_irq_restore(flags);
}
set_irq_chip_and_handler_name(p->irq, &desc->chip,
handle_level_irq, "level");
set_irq_chip_data(p->irq, p);
disable_intc2_irq(p->irq);
}
}
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