Kumar Gala | 98384c6 | 2008-07-02 11:46:20 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2008 Freescale Semiconductor, Inc. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License as published by the |
| 6 | * Free Software Foundation; either version 2 of the License, or (at your |
| 7 | * option) any later version. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/stddef.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/interrupt.h> |
Rob Herring | 26a2056 | 2013-09-26 07:40:04 -0500 | [diff] [blame] | 13 | #include <linux/of_irq.h> |
Kumar Gala | 98384c6 | 2008-07-02 11:46:20 -0500 | [diff] [blame] | 14 | #include <linux/of_platform.h> |
| 15 | |
Kumar Gala | 98384c6 | 2008-07-02 11:46:20 -0500 | [diff] [blame] | 16 | #include <asm/mpic.h> |
| 17 | #include <asm/i8259.h> |
| 18 | |
| 19 | #ifdef CONFIG_PPC_I8259 |
Thomas Gleixner | bd0b9ac | 2015-09-14 10:42:37 +0200 | [diff] [blame] | 20 | static void mpc86xx_8259_cascade(struct irq_desc *desc) |
Kumar Gala | 98384c6 | 2008-07-02 11:46:20 -0500 | [diff] [blame] | 21 | { |
Thomas Gleixner | ec775d0 | 2011-03-25 16:45:20 +0100 | [diff] [blame] | 22 | struct irq_chip *chip = irq_desc_get_chip(desc); |
Kumar Gala | 98384c6 | 2008-07-02 11:46:20 -0500 | [diff] [blame] | 23 | unsigned int cascade_irq = i8259_irq(); |
Lennert Buytenhek | 5b25088 | 2011-03-07 13:59:23 +0000 | [diff] [blame] | 24 | |
Michael Ellerman | ef24ba7 | 2016-09-06 21:53:24 +1000 | [diff] [blame] | 25 | if (cascade_irq) |
Kumar Gala | 98384c6 | 2008-07-02 11:46:20 -0500 | [diff] [blame] | 26 | generic_handle_irq(cascade_irq); |
Lennert Buytenhek | 5b25088 | 2011-03-07 13:59:23 +0000 | [diff] [blame] | 27 | |
| 28 | chip->irq_eoi(&desc->irq_data); |
Kumar Gala | 98384c6 | 2008-07-02 11:46:20 -0500 | [diff] [blame] | 29 | } |
| 30 | #endif /* CONFIG_PPC_I8259 */ |
| 31 | |
| 32 | void __init mpc86xx_init_irq(void) |
| 33 | { |
Kumar Gala | 98384c6 | 2008-07-02 11:46:20 -0500 | [diff] [blame] | 34 | #ifdef CONFIG_PPC_I8259 |
Kyle Moffett | 996983b | 2011-12-02 06:28:02 +0000 | [diff] [blame] | 35 | struct device_node *np; |
Kumar Gala | 98384c6 | 2008-07-02 11:46:20 -0500 | [diff] [blame] | 36 | struct device_node *cascade_node = NULL; |
| 37 | int cascade_irq; |
| 38 | #endif |
| 39 | |
Kyle Moffett | e55d7f7 | 2011-12-22 10:19:14 +0000 | [diff] [blame] | 40 | struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN | |
Kyle Moffett | 5019609 | 2011-12-22 10:19:12 +0000 | [diff] [blame] | 41 | MPIC_SINGLE_DEST_CPU, |
Kumar Gala | 98384c6 | 2008-07-02 11:46:20 -0500 | [diff] [blame] | 42 | 0, 256, " MPIC "); |
Kumar Gala | 98384c6 | 2008-07-02 11:46:20 -0500 | [diff] [blame] | 43 | BUG_ON(mpic == NULL); |
| 44 | |
| 45 | mpic_init(mpic); |
| 46 | |
| 47 | #ifdef CONFIG_PPC_I8259 |
| 48 | /* Initialize i8259 controller */ |
| 49 | for_each_node_by_type(np, "interrupt-controller") |
| 50 | if (of_device_is_compatible(np, "chrp,iic")) { |
| 51 | cascade_node = np; |
| 52 | break; |
| 53 | } |
| 54 | |
| 55 | if (cascade_node == NULL) { |
| 56 | printk(KERN_DEBUG "Could not find i8259 PIC\n"); |
| 57 | return; |
| 58 | } |
| 59 | |
| 60 | cascade_irq = irq_of_parse_and_map(cascade_node, 0); |
Michael Ellerman | ef24ba7 | 2016-09-06 21:53:24 +1000 | [diff] [blame] | 61 | if (!cascade_irq) { |
Kumar Gala | 98384c6 | 2008-07-02 11:46:20 -0500 | [diff] [blame] | 62 | printk(KERN_ERR "Failed to map cascade interrupt\n"); |
| 63 | return; |
| 64 | } |
| 65 | |
| 66 | i8259_init(cascade_node, 0); |
| 67 | of_node_put(cascade_node); |
| 68 | |
Thomas Gleixner | ec775d0 | 2011-03-25 16:45:20 +0100 | [diff] [blame] | 69 | irq_set_chained_handler(cascade_irq, mpc86xx_8259_cascade); |
Kumar Gala | 98384c6 | 2008-07-02 11:46:20 -0500 | [diff] [blame] | 70 | #endif |
| 71 | } |