| 1 | /* |
| 2 | * ADM5120 specific interrupt handlers |
| 3 | * |
| 4 | * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License version 2 as published |
| 8 | * by the Free Software Foundation. |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/version.h> |
| 15 | #include <linux/irq.h> |
| 16 | #include <linux/interrupt.h> |
| 17 | #include <linux/ioport.h> |
| 18 | #include <linux/io.h> |
| 19 | #include <linux/bitops.h> |
| 20 | |
| 21 | #include <asm/irq_cpu.h> |
| 22 | #include <asm/mipsregs.h> |
| 23 | |
| 24 | #include <asm/mach-adm5120/adm5120_defs.h> |
| 25 | |
| 26 | static void adm5120_intc_irq_unmask(struct irq_data *d); |
| 27 | static void adm5120_intc_irq_mask(struct irq_data *d); |
| 28 | static int adm5120_intc_irq_set_type(struct irq_data *d, unsigned int flow_type); |
| 29 | |
| 30 | static inline void intc_write_reg(unsigned int reg, u32 val) |
| 31 | { |
| 32 | void __iomem *base = (void __iomem *)KSEG1ADDR(ADM5120_INTC_BASE); |
| 33 | |
| 34 | __raw_writel(val, base + reg); |
| 35 | } |
| 36 | |
| 37 | static inline u32 intc_read_reg(unsigned int reg) |
| 38 | { |
| 39 | void __iomem *base = (void __iomem *)KSEG1ADDR(ADM5120_INTC_BASE); |
| 40 | |
| 41 | return __raw_readl(base + reg); |
| 42 | } |
| 43 | |
| 44 | static struct irq_chip adm5120_intc_irq_chip = { |
| 45 | .name = "INTC", |
| 46 | .irq_unmask = adm5120_intc_irq_unmask, |
| 47 | .irq_mask = adm5120_intc_irq_mask, |
| 48 | .irq_mask_ack = adm5120_intc_irq_mask, |
| 49 | .irq_set_type = adm5120_intc_irq_set_type |
| 50 | }; |
| 51 | |
| 52 | static struct irqaction adm5120_intc_irq_action = { |
| 53 | .handler = no_action, |
| 54 | .name = "cascade [INTC]" |
| 55 | }; |
| 56 | |
| 57 | static void adm5120_intc_irq_unmask(struct irq_data *d) |
| 58 | { |
| 59 | intc_write_reg(INTC_REG_IRQ_ENABLE, 1 << (d->irq - ADM5120_INTC_IRQ_BASE)); |
| 60 | } |
| 61 | |
| 62 | static void adm5120_intc_irq_mask(struct irq_data *d) |
| 63 | { |
| 64 | intc_write_reg(INTC_REG_IRQ_DISABLE, 1 << (d->irq - ADM5120_INTC_IRQ_BASE)); |
| 65 | } |
| 66 | |
| 67 | static int adm5120_intc_irq_set_type(struct irq_data *d, unsigned int flow_type) |
| 68 | { |
| 69 | unsigned int irq = d->irq; |
| 70 | unsigned int sense; |
| 71 | unsigned long mode; |
| 72 | int err = 0; |
| 73 | |
| 74 | sense = flow_type & (IRQ_TYPE_SENSE_MASK); |
| 75 | switch (sense) { |
| 76 | case IRQ_TYPE_NONE: |
| 77 | case IRQ_TYPE_LEVEL_HIGH: |
| 78 | break; |
| 79 | case IRQ_TYPE_LEVEL_LOW: |
| 80 | switch (irq) { |
| 81 | case ADM5120_IRQ_GPIO2: |
| 82 | case ADM5120_IRQ_GPIO4: |
| 83 | break; |
| 84 | default: |
| 85 | err = -EINVAL; |
| 86 | break; |
| 87 | } |
| 88 | break; |
| 89 | default: |
| 90 | err = -EINVAL; |
| 91 | break; |
| 92 | } |
| 93 | |
| 94 | if (err) |
| 95 | return err; |
| 96 | |
| 97 | switch (irq) { |
| 98 | case ADM5120_IRQ_GPIO2: |
| 99 | case ADM5120_IRQ_GPIO4: |
| 100 | mode = intc_read_reg(INTC_REG_INT_MODE); |
| 101 | if (sense == IRQ_TYPE_LEVEL_LOW) |
| 102 | mode |= (1 << (irq - ADM5120_INTC_IRQ_BASE)); |
| 103 | else |
| 104 | mode &= ~(1 << (irq - ADM5120_INTC_IRQ_BASE)); |
| 105 | |
| 106 | intc_write_reg(INTC_REG_INT_MODE, mode); |
| 107 | break; |
| 108 | } |
| 109 | |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | static void adm5120_intc_irq_dispatch(void) |
| 114 | { |
| 115 | unsigned long status; |
| 116 | int irq; |
| 117 | |
| 118 | status = intc_read_reg(INTC_REG_IRQ_STATUS) & INTC_INT_ALL; |
| 119 | if (status) { |
| 120 | irq = ADM5120_INTC_IRQ_BASE + fls(status) - 1; |
| 121 | do_IRQ(irq); |
| 122 | } else |
| 123 | spurious_interrupt(); |
| 124 | } |
| 125 | |
| 126 | asmlinkage void plat_irq_dispatch(void) |
| 127 | { |
| 128 | unsigned long pending; |
| 129 | |
| 130 | pending = read_c0_status() & read_c0_cause() & ST0_IM; |
| 131 | |
| 132 | if (pending & STATUSF_IP7) |
| 133 | do_IRQ(ADM5120_IRQ_COUNTER); |
| 134 | else if (pending & STATUSF_IP2) |
| 135 | adm5120_intc_irq_dispatch(); |
| 136 | else |
| 137 | spurious_interrupt(); |
| 138 | } |
| 139 | |
| 140 | #define INTC_IRQ_STATUS (IRQ_LEVEL | IRQ_TYPE_LEVEL_HIGH | IRQ_DISABLED) |
| 141 | static void __init adm5120_intc_irq_init(void) |
| 142 | { |
| 143 | int i; |
| 144 | |
| 145 | /* disable all interrupts */ |
| 146 | intc_write_reg(INTC_REG_IRQ_DISABLE, INTC_INT_ALL); |
| 147 | |
| 148 | /* setup all interrupts to generate IRQ instead of FIQ */ |
| 149 | intc_write_reg(INTC_REG_INT_MODE, 0); |
| 150 | |
| 151 | /* set active level for all external interrupts to HIGH */ |
| 152 | intc_write_reg(INTC_REG_INT_LEVEL, 0); |
| 153 | |
| 154 | /* disable usage of the TEST_SOURCE register */ |
| 155 | intc_write_reg(INTC_REG_IRQ_SOURCE_SELECT, 0); |
| 156 | |
| 157 | for (i = ADM5120_INTC_IRQ_BASE; |
| 158 | i <= ADM5120_INTC_IRQ_BASE + INTC_IRQ_LAST; |
| 159 | i++) { |
| 160 | irq_set_chip_and_handler(i, &adm5120_intc_irq_chip, |
| 161 | handle_level_irq); |
| 162 | } |
| 163 | |
| 164 | setup_irq(ADM5120_IRQ_INTC, &adm5120_intc_irq_action); |
| 165 | } |
| 166 | |
| 167 | void __init arch_init_irq(void) |
| 168 | { |
| 169 | mips_cpu_irq_init(); |
| 170 | adm5120_intc_irq_init(); |
| 171 | } |
| 172 | |
