projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| f27ffc75 LFT |
1 | /* |
| 2 | * Copyright (C) 2013 Altera Corporation | |
| 3 | * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> | |
| 4 | * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw> | |
| 5 | * | |
| 6 | * based on irq.c from m68k which is: | |
| 7 | * | |
| 8 | * Copyright (C) 2007 Greg Ungerer <gerg@snapgear.com> | |
| 9 | * | |
| 10 | * This program is free software; you can redistribute it and/or modify | |
| 11 | * it under the terms of the GNU General Public License as published by | |
| 12 | * the Free Software Foundation; either version 2 of the License, or | |
| 13 | * (at your option) any later version. | |
| 14 | * | |
| 15 | * This program is distributed in the hope that it will be useful, | |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 18 | * GNU General Public License for more details. | |
| 19 | * | |
| 20 | * You should have received a copy of the GNU General Public License | |
| 21 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 22 | * | |
| 23 | */ | |
| 24 | ||
| 25 | #include <linux/init.h> | |
| 26 | #include <linux/interrupt.h> | |
| 27 | #include <linux/of.h> | |
| 28 | ||
| 29 | static u32 ienable; | |
| 30 | ||
| 31 | asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs) | |
| 32 | { | |
| 33 | struct pt_regs *oldregs = set_irq_regs(regs); | |
| 34 | int irq; | |
| 35 | ||
| 36 | irq_enter(); | |
| 37 | irq = irq_find_mapping(NULL, hwirq); | |
| 38 | generic_handle_irq(irq); | |
| 39 | irq_exit(); | |
| 40 | ||
| 41 | set_irq_regs(oldregs); | |
| 42 | } | |
| 43 | ||
| 44 | static void chip_unmask(struct irq_data *d) | |
| 45 | { | |
| 46 | ienable |= (1 << d->hwirq); | |
| 47 | WRCTL(CTL_IENABLE, ienable); | |
| 48 | } | |
| 49 | ||
| 50 | static void chip_mask(struct irq_data *d) | |
| 51 | { | |
| 52 | ienable &= ~(1 << d->hwirq); | |
| 53 | WRCTL(CTL_IENABLE, ienable); | |
| 54 | } | |
| 55 | ||
| 56 | static struct irq_chip m_irq_chip = { | |
| 57 | .name = "NIOS2-INTC", | |
| 58 | .irq_unmask = chip_unmask, | |
| 59 | .irq_mask = chip_mask, | |
| 60 | }; | |
| 61 | ||
| 62 | static int irq_map(struct irq_domain *h, unsigned int virq, | |
| 63 | irq_hw_number_t hw_irq_num) | |
| 64 | { | |
| 65 | irq_set_chip_and_handler(virq, &m_irq_chip, handle_level_irq); | |
| 66 | ||
| 67 | return 0; | |
| 68 | } | |
| 69 | ||
| 70 | static struct irq_domain_ops irq_ops = { | |
| 71 | .map = irq_map, | |
| 72 | .xlate = irq_domain_xlate_onecell, | |
| 73 | }; | |
| 74 | ||
| 75 | void __init init_IRQ(void) | |
| 76 | { | |
| 77 | struct irq_domain *domain; | |
| 78 | struct device_node *node; | |
| 79 | ||
| 80 | node = of_find_compatible_node(NULL, NULL, "altr,nios2-1.0"); | |
| 81 | if (!node) | |
| 82 | node = of_find_compatible_node(NULL, NULL, "altr,nios2-1.1"); | |
| 83 | ||
| 84 | BUG_ON(!node); | |
| 85 | ||
| 86 | domain = irq_domain_add_linear(node, NIOS2_CPU_NR_IRQS, &irq_ops, NULL); | |
| 87 | BUG_ON(!domain); | |
| 88 | ||
| 89 | irq_set_default_host(domain); | |
| 90 | of_node_put(node); | |
| 91 | /* Load the initial ienable value */ | |
| 92 | ienable = RDCTL(CTL_IENABLE); | |
| 93 | } |