77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/*
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* linux/arch/sh/boards/se/7722/irq.c
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*
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* Copyright (C) 2007 Nobuhiro Iwamatsu
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*
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* Hitachi UL SolutionEngine 7722 Support.
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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/interrupt.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/se7722.h>
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static void disable_se7722_irq(unsigned int irq)
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{
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unsigned int bit = irq - SE7722_FPGA_IRQ_BASE;
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ctrl_outw(ctrl_inw(IRQ01_MASK) | 1 << bit, IRQ01_MASK);
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}
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static void enable_se7722_irq(unsigned int irq)
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{
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unsigned int bit = irq - SE7722_FPGA_IRQ_BASE;
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ctrl_outw(ctrl_inw(IRQ01_MASK) & ~(1 << bit), IRQ01_MASK);
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}
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static struct irq_chip se7722_irq_chip __read_mostly = {
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.name = "SE7722-FPGA",
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.mask = disable_se7722_irq,
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.unmask = enable_se7722_irq,
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.mask_ack = disable_se7722_irq,
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};
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static void se7722_irq_demux(unsigned int irq, struct irq_desc *desc)
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{
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unsigned short intv = ctrl_inw(IRQ01_STS);
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struct irq_desc *ext_desc;
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unsigned int ext_irq = SE7722_FPGA_IRQ_BASE;
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intv &= (1 << SE7722_FPGA_IRQ_NR) - 1;
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while (intv) {
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if (intv & 1) {
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ext_desc = irq_desc + ext_irq;
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handle_level_irq(ext_irq, ext_desc);
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}
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intv >>= 1;
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ext_irq++;
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}
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}
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/*
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* Initialize IRQ setting
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*/
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void __init init_se7722_IRQ(void)
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{
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int i;
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ctrl_outw(0, IRQ01_MASK); /* disable all irqs */
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ctrl_outw(0x2000, 0xb03fffec); /* mrshpc irq enable */
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for (i = 0; i < SE7722_FPGA_IRQ_NR; i++)
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set_irq_chip_and_handler_name(SE7722_FPGA_IRQ_BASE + i,
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&se7722_irq_chip,
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handle_level_irq, "level");
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set_irq_chained_handler(IRQ0_IRQ, se7722_irq_demux);
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set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
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set_irq_chained_handler(IRQ1_IRQ, se7722_irq_demux);
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set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
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}
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