74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/*
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* Interrupt handling for IPR-based IRQ.
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*
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* Copyright (C) 1999 Niibe Yutaka & Takeshi Yaegashi
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* Copyright (C) 2000 Kazumoto Kojima
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* Copyright (C) 2003 Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp>
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* Copyright (C) 2006 Paul Mundt
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*
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* Supported system:
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* On-chip supporting modules (TMU, RTC, etc.).
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* On-chip supporting modules for SH7709/SH7709A/SH7729.
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* Hitachi SolutionEngine external I/O:
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* MS7709SE01, MS7709ASE01, and MS7750SE01
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/interrupt.h>
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static inline struct ipr_desc *get_ipr_desc(unsigned int irq)
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{
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struct irq_chip *chip = get_irq_chip(irq);
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return (void *)((char *)chip - offsetof(struct ipr_desc, chip));
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}
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static void disable_ipr_irq(unsigned int irq)
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{
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struct ipr_data *p = get_irq_chip_data(irq);
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unsigned long addr = get_ipr_desc(irq)->ipr_offsets[p->ipr_idx];
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/* Set the priority in IPR to 0 */
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__raw_writew(__raw_readw(addr) & (0xffff ^ (0xf << p->shift)), addr);
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}
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static void enable_ipr_irq(unsigned int irq)
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{
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struct ipr_data *p = get_irq_chip_data(irq);
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unsigned long addr = get_ipr_desc(irq)->ipr_offsets[p->ipr_idx];
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/* Set priority in IPR back to original value */
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__raw_writew(__raw_readw(addr) | (p->priority << p->shift), addr);
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}
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/*
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* The shift value is now the number of bits to shift, not the number of
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* bits/4. This is to make it easier to read the value directly from the
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* datasheets. The IPR address is calculated using the ipr_offset table.
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*/
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void register_ipr_controller(struct ipr_desc *desc)
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{
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int i;
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desc->chip.mask = disable_ipr_irq;
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desc->chip.unmask = enable_ipr_irq;
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desc->chip.mask_ack = disable_ipr_irq;
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for (i = 0; i < desc->nr_irqs; i++) {
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struct ipr_data *p = desc->ipr_data + i;
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BUG_ON(p->ipr_idx >= desc->nr_offsets);
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BUG_ON(!desc->ipr_offsets[p->ipr_idx]);
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disable_irq_nosync(p->irq);
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set_irq_chip_and_handler_name(p->irq, &desc->chip,
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handle_level_irq, "level");
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set_irq_chip_data(p->irq, p);
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disable_ipr_irq(p->irq);
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}
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}
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EXPORT_SYMBOL(register_ipr_controller);
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