| 1 | /* |
| 2 | * Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us> |
| 3 | * |
| 4 | * This file is subject to the terms and conditions of the GNU General Public |
| 5 | * License. See the file "COPYING" in the main directory of this archive |
| 6 | * for more details. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/kernel_stat.h> |
| 11 | #include <linux/signal.h> |
| 12 | #include <linux/sched.h> |
| 13 | #include <linux/interrupt.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/random.h> |
| 16 | #include <linux/pm.h> |
| 17 | #include <linux/irq.h> |
| 18 | #include <asm/mipsregs.h> |
| 19 | #include <asm/irq_cpu.h> |
| 20 | #include <asm/irq.h> |
| 21 | #include <adm8668.h> |
| 22 | |
| 23 | static void adm8668_irq_cascade(void) |
| 24 | { |
| 25 | int i; |
| 26 | unsigned long intsrc; |
| 27 | |
| 28 | intsrc = ADM8668_INTC_REG(IRQ_STATUS_REG) & IRQ_MASK; |
| 29 | for (i = 0; intsrc; intsrc >>= 1, i++) |
| 30 | if (intsrc & 0x1) |
| 31 | do_IRQ(i); |
| 32 | } |
| 33 | |
| 34 | /* |
| 35 | * System irq dispatch |
| 36 | */ |
| 37 | void plat_irq_dispatch(void) |
| 38 | { |
| 39 | unsigned int pending; |
| 40 | |
| 41 | pending = read_c0_cause() & read_c0_status() & ST0_IM; |
| 42 | |
| 43 | /* timer interrupt, that we renumbered */ |
| 44 | if (pending & STATUSF_IP7) |
| 45 | do_IRQ(MIPS_CPU_IRQ_BASE + 7); |
| 46 | if (pending & STATUSF_IP2) |
| 47 | adm8668_irq_cascade(); |
| 48 | } |
| 49 | |
| 50 | /* |
| 51 | * enable 8668 irq |
| 52 | */ |
| 53 | static void enable_adm8668_irq(struct irq_data *d) |
| 54 | { |
| 55 | int irq = d->irq; |
| 56 | |
| 57 | if ((irq < 0) || (irq > NR_IRQS)) |
| 58 | return; |
| 59 | |
| 60 | ADM8668_INTC_REG(IRQ_ENABLE_REG) = (1 << irq); |
| 61 | } |
| 62 | |
| 63 | |
| 64 | /* |
| 65 | * disable 8668 irq |
| 66 | */ |
| 67 | static void disable_adm8668_irq(struct irq_data *d) |
| 68 | { |
| 69 | int irq = d->irq; |
| 70 | |
| 71 | if ((irq < 0) || (irq > NR_IRQS)) |
| 72 | return; |
| 73 | |
| 74 | ADM8668_INTC_REG(IRQ_DISABLE_REG) = (1 << irq); |
| 75 | } |
| 76 | |
| 77 | static void ack_adm8668_irq(struct irq_data *d) |
| 78 | { |
| 79 | int irq = d->irq; |
| 80 | |
| 81 | ADM8668_INTC_REG(IRQ_DISABLE_REG) = (1 << irq); |
| 82 | } |
| 83 | |
| 84 | /* |
| 85 | * system irq type |
| 86 | */ |
| 87 | |
| 88 | static struct irq_chip adm8668_irq_type = { |
| 89 | .name = "adm8668", |
| 90 | .irq_ack = ack_adm8668_irq, |
| 91 | .irq_mask = disable_adm8668_irq, |
| 92 | .irq_unmask = enable_adm8668_irq |
| 93 | }; |
| 94 | |
| 95 | /* |
| 96 | * irq init |
| 97 | */ |
| 98 | static void __init init_adm8668_irqs(void) |
| 99 | { |
| 100 | int i; |
| 101 | |
| 102 | for (i = 0; i <= INT_LVL_MAX; i++) |
| 103 | irq_set_chip_and_handler(i, &adm8668_irq_type, |
| 104 | handle_level_irq); |
| 105 | |
| 106 | /* hw0 is where our interrupts are uh.. interrupted at. */ |
| 107 | set_c0_status(IE_IRQ0); |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * system init |
| 112 | */ |
| 113 | void __init arch_init_irq(void) |
| 114 | { |
| 115 | mips_cpu_irq_init(); |
| 116 | init_adm8668_irqs(); |
| 117 | } |
| 118 | |
