forked from Minki/linux
ef24ba7091
NO_IRQ has been == 0 on powerpc for just over ten years (since commit
0ebfff1491 ("[POWERPC] Add new interrupt mapping core and change
platforms to use it")). It's also 0 on most other arches.
Although it's fairly harmless, every now and then it causes confusion
when a driver is built on powerpc and another arch which doesn't define
NO_IRQ. There's at least 6 definitions of NO_IRQ in drivers/, at least
some of which are to work around that problem.
So we'd like to remove it. This is fairly trivial in the arch code, we
just convert:
if (irq == NO_IRQ) to if (!irq)
if (irq != NO_IRQ) to if (irq)
irq = NO_IRQ; to irq = 0;
return NO_IRQ; to return 0;
And a few other odd cases as well.
At least for now we keep the #define NO_IRQ, because there is driver
code that uses NO_IRQ and the fixes to remove those will go via other
trees.
Note we also change some occurrences in PPC sound drivers, drivers/ps3,
and drivers/macintosh.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/*
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* Copyright 2008 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/stddef.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <asm/mpic.h>
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#include <asm/i8259.h>
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#ifdef CONFIG_PPC_I8259
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static void mpc86xx_8259_cascade(struct irq_desc *desc)
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{
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struct irq_chip *chip = irq_desc_get_chip(desc);
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unsigned int cascade_irq = i8259_irq();
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if (cascade_irq)
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generic_handle_irq(cascade_irq);
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chip->irq_eoi(&desc->irq_data);
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}
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#endif /* CONFIG_PPC_I8259 */
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void __init mpc86xx_init_irq(void)
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{
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#ifdef CONFIG_PPC_I8259
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struct device_node *np;
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struct device_node *cascade_node = NULL;
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int cascade_irq;
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#endif
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struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
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MPIC_SINGLE_DEST_CPU,
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0, 256, " MPIC ");
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BUG_ON(mpic == NULL);
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mpic_init(mpic);
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#ifdef CONFIG_PPC_I8259
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/* Initialize i8259 controller */
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for_each_node_by_type(np, "interrupt-controller")
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if (of_device_is_compatible(np, "chrp,iic")) {
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cascade_node = np;
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break;
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}
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if (cascade_node == NULL) {
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printk(KERN_DEBUG "Could not find i8259 PIC\n");
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return;
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}
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cascade_irq = irq_of_parse_and_map(cascade_node, 0);
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if (!cascade_irq) {
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printk(KERN_ERR "Failed to map cascade interrupt\n");
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return;
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}
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i8259_init(cascade_node, 0);
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of_node_put(cascade_node);
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irq_set_chained_handler(cascade_irq, mpc86xx_8259_cascade);
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#endif
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}
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