| 1 | /* |
| 2 | * Moschip MCS814x generic interrupt controller routines |
| 3 | * |
| 4 | * Copyright (C) 2012, Florian Fainelli <florian@openwrt.org> |
| 5 | * |
| 6 | * Licensed under the GPLv2 |
| 7 | */ |
| 8 | #include <linux/init.h> |
| 9 | #include <linux/irq.h> |
| 10 | #include <linux/io.h> |
| 11 | #include <linux/of.h> |
| 12 | #include <linux/of_address.h> |
| 13 | #include <linux/irqdomain.h> |
| 14 | |
| 15 | #include <asm/exception.h> |
| 16 | #include <asm/mach/irq.h> |
| 17 | #include <mach/mcs814x.h> |
| 18 | |
| 19 | void __iomem *mcs814x_intc_base; |
| 20 | |
| 21 | static void __init mcs814x_alloc_gc(void __iomem *base, unsigned int irq_start, |
| 22 | unsigned int num) |
| 23 | { |
| 24 | struct irq_chip_generic *gc; |
| 25 | struct irq_chip_type *ct; |
| 26 | |
| 27 | gc = irq_alloc_generic_chip("mcs814x-intc", 1, |
| 28 | irq_start, base, handle_level_irq); |
| 29 | if (!gc) |
| 30 | panic("unable to allocate generic irq chip"); |
| 31 | |
| 32 | ct = gc->chip_types; |
| 33 | ct->chip.irq_ack = irq_gc_unmask_enable_reg; |
| 34 | ct->chip.irq_mask = irq_gc_mask_clr_bit; |
| 35 | ct->chip.irq_unmask = irq_gc_mask_set_bit; |
| 36 | ct->regs.mask = MCS814X_IRQ_MASK; |
| 37 | ct->regs.enable = MCS814X_IRQ_ICR; |
| 38 | |
| 39 | irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE, |
| 40 | IRQ_NOREQUEST, 0); |
| 41 | |
| 42 | /* Clear all interrupts */ |
| 43 | writel_relaxed(0xffffffff, base + MCS814X_IRQ_ICR); |
| 44 | } |
| 45 | |
| 46 | static const struct of_device_id mcs814x_intc_ids[] = { |
| 47 | { .compatible = "moschip,mcs814x-intc" }, |
| 48 | { /* sentinel */ }, |
| 49 | }; |
| 50 | |
| 51 | void __init mcs814x_of_irq_init(void) |
| 52 | { |
| 53 | struct device_node *np; |
| 54 | |
| 55 | np = of_find_matching_node(NULL, mcs814x_intc_ids); |
| 56 | if (!np) |
| 57 | panic("unable to find compatible intc node in dtb\n"); |
| 58 | |
| 59 | mcs814x_intc_base = of_iomap(np, 0); |
| 60 | if (!mcs814x_intc_base) |
| 61 | panic("unable to map intc cpu registers\n"); |
| 62 | |
| 63 | irq_domain_add_simple(np, 0); |
| 64 | |
| 65 | of_node_put(np); |
| 66 | |
| 67 | mcs814x_alloc_gc(mcs814x_intc_base, 0, 32); |
| 68 | } |
| 69 | |
| 70 | |
