81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* Interrupt handling for IPR-based IRQ.
|
||
|
|
*
|
||
|
|
* Copyright (C) 1999 Niibe Yutaka & Takeshi Yaegashi
|
||
|
|
* Copyright (C) 2000 Kazumoto Kojima
|
||
|
|
* Copyright (C) 2003 Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp>
|
||
|
|
* Copyright (C) 2006 Paul Mundt
|
||
|
|
*
|
||
|
|
* Supported system:
|
||
|
|
* On-chip supporting modules (TMU, RTC, etc.).
|
||
|
|
* On-chip supporting modules for SH7709/SH7709A/SH7729.
|
||
|
|
* Hitachi SolutionEngine external I/O:
|
||
|
|
* MS7709SE01, MS7709ASE01, and MS7750SE01
|
||
|
|
*/
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/irq.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/topology.h>
|
||
|
|
|
||
|
|
static inline struct ipr_desc *get_ipr_desc(struct irq_data *data)
|
||
|
|
{
|
||
|
|
struct irq_chip *chip = irq_data_get_irq_chip(data);
|
||
|
|
return container_of(chip, struct ipr_desc, chip);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void disable_ipr_irq(struct irq_data *data)
|
||
|
|
{
|
||
|
|
struct ipr_data *p = irq_data_get_irq_chip_data(data);
|
||
|
|
unsigned long addr = get_ipr_desc(data)->ipr_offsets[p->ipr_idx];
|
||
|
|
/* Set the priority in IPR to 0 */
|
||
|
|
__raw_writew(__raw_readw(addr) & (0xffff ^ (0xf << p->shift)), addr);
|
||
|
|
(void)__raw_readw(addr); /* Read back to flush write posting */
|
||
|
|
}
|
||
|
|
|
||
|
|
static void enable_ipr_irq(struct irq_data *data)
|
||
|
|
{
|
||
|
|
struct ipr_data *p = irq_data_get_irq_chip_data(data);
|
||
|
|
unsigned long addr = get_ipr_desc(data)->ipr_offsets[p->ipr_idx];
|
||
|
|
/* Set priority in IPR back to original value */
|
||
|
|
__raw_writew(__raw_readw(addr) | (p->priority << p->shift), addr);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The shift value is now the number of bits to shift, not the number of
|
||
|
|
* bits/4. This is to make it easier to read the value directly from the
|
||
|
|
* datasheets. The IPR address is calculated using the ipr_offset table.
|
||
|
|
*/
|
||
|
|
void register_ipr_controller(struct ipr_desc *desc)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
desc->chip.irq_mask = disable_ipr_irq;
|
||
|
|
desc->chip.irq_unmask = enable_ipr_irq;
|
||
|
|
|
||
|
|
for (i = 0; i < desc->nr_irqs; i++) {
|
||
|
|
struct ipr_data *p = desc->ipr_data + i;
|
||
|
|
int res;
|
||
|
|
|
||
|
|
BUG_ON(p->ipr_idx >= desc->nr_offsets);
|
||
|
|
BUG_ON(!desc->ipr_offsets[p->ipr_idx]);
|
||
|
|
|
||
|
|
res = irq_alloc_desc_at(p->irq, numa_node_id());
|
||
|
|
if (unlikely(res != p->irq && res != -EEXIST)) {
|
||
|
|
printk(KERN_INFO "can not get irq_desc for %d\n",
|
||
|
|
p->irq);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
disable_irq_nosync(p->irq);
|
||
|
|
irq_set_chip_and_handler_name(p->irq, &desc->chip,
|
||
|
|
handle_level_irq, "level");
|
||
|
|
irq_set_chip_data(p->irq, p);
|
||
|
|
disable_ipr_irq(irq_get_irq_data(p->irq));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(register_ipr_controller);
|