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67 lines
1.4 KiB
67 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright 2008 Freescale Semiconductor, Inc. |
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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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