1 /*
2 * arch/arm/mach-dove/irq.c
3 *
4 * Dove IRQ handling.
5 *
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/irq.h>
14 #include <linux/gpio.h>
15 #include <linux/io.h>
16 #include <asm/mach/arch.h>
17 #include <plat/irq.h>
18 #include <asm/mach/irq.h>
19 #include <mach/pm.h>
20 #include <mach/bridge-regs.h>
21 #include "common.h"
22
gpio_irq_handler(unsigned int irq,struct irq_desc * desc)23 static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
24 {
25 int irqoff;
26 BUG_ON(irq < IRQ_DOVE_GPIO_0_7 || irq > IRQ_DOVE_HIGH_GPIO);
27
28 irqoff = irq <= IRQ_DOVE_GPIO_16_23 ? irq - IRQ_DOVE_GPIO_0_7 :
29 3 + irq - IRQ_DOVE_GPIO_24_31;
30
31 orion_gpio_irq_handler(irqoff << 3);
32 if (irq == IRQ_DOVE_HIGH_GPIO) {
33 orion_gpio_irq_handler(40);
34 orion_gpio_irq_handler(48);
35 orion_gpio_irq_handler(56);
36 }
37 }
38
pmu_irq_mask(struct irq_data * d)39 static void pmu_irq_mask(struct irq_data *d)
40 {
41 int pin = irq_to_pmu(d->irq);
42 u32 u;
43
44 u = readl(PMU_INTERRUPT_MASK);
45 u &= ~(1 << (pin & 31));
46 writel(u, PMU_INTERRUPT_MASK);
47 }
48
pmu_irq_unmask(struct irq_data * d)49 static void pmu_irq_unmask(struct irq_data *d)
50 {
51 int pin = irq_to_pmu(d->irq);
52 u32 u;
53
54 u = readl(PMU_INTERRUPT_MASK);
55 u |= 1 << (pin & 31);
56 writel(u, PMU_INTERRUPT_MASK);
57 }
58
pmu_irq_ack(struct irq_data * d)59 static void pmu_irq_ack(struct irq_data *d)
60 {
61 int pin = irq_to_pmu(d->irq);
62 u32 u;
63
64 u = ~(1 << (pin & 31));
65 writel(u, PMU_INTERRUPT_CAUSE);
66 }
67
68 static struct irq_chip pmu_irq_chip = {
69 .name = "pmu_irq",
70 .irq_mask = pmu_irq_mask,
71 .irq_unmask = pmu_irq_unmask,
72 .irq_ack = pmu_irq_ack,
73 };
74
pmu_irq_handler(unsigned int irq,struct irq_desc * desc)75 static void pmu_irq_handler(unsigned int irq, struct irq_desc *desc)
76 {
77 unsigned long cause = readl(PMU_INTERRUPT_CAUSE);
78
79 cause &= readl(PMU_INTERRUPT_MASK);
80 if (cause == 0) {
81 do_bad_IRQ(irq, desc);
82 return;
83 }
84
85 for (irq = 0; irq < NR_PMU_IRQS; irq++) {
86 if (!(cause & (1 << irq)))
87 continue;
88 irq = pmu_to_irq(irq);
89 generic_handle_irq(irq);
90 }
91 }
92
dove_init_irq(void)93 void __init dove_init_irq(void)
94 {
95 int i;
96
97 orion_irq_init(0, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF));
98 orion_irq_init(32, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF));
99
100 /*
101 * Initialize gpiolib for GPIOs 0-71.
102 */
103 orion_gpio_init(0, 32, DOVE_GPIO_LO_VIRT_BASE, 0,
104 IRQ_DOVE_GPIO_START);
105 irq_set_chained_handler(IRQ_DOVE_GPIO_0_7, gpio_irq_handler);
106 irq_set_chained_handler(IRQ_DOVE_GPIO_8_15, gpio_irq_handler);
107 irq_set_chained_handler(IRQ_DOVE_GPIO_16_23, gpio_irq_handler);
108 irq_set_chained_handler(IRQ_DOVE_GPIO_24_31, gpio_irq_handler);
109
110 orion_gpio_init(32, 32, DOVE_GPIO_HI_VIRT_BASE, 0,
111 IRQ_DOVE_GPIO_START + 32);
112 irq_set_chained_handler(IRQ_DOVE_HIGH_GPIO, gpio_irq_handler);
113
114 orion_gpio_init(64, 8, DOVE_GPIO2_VIRT_BASE, 0,
115 IRQ_DOVE_GPIO_START + 64);
116
117 /*
118 * Mask and clear PMU interrupts
119 */
120 writel(0, PMU_INTERRUPT_MASK);
121 writel(0, PMU_INTERRUPT_CAUSE);
122
123 for (i = IRQ_DOVE_PMU_START; i < NR_IRQS; i++) {
124 irq_set_chip_and_handler(i, &pmu_irq_chip, handle_level_irq);
125 irq_set_status_flags(i, IRQ_LEVEL);
126 set_irq_flags(i, IRQF_VALID);
127 }
128 irq_set_chained_handler(IRQ_DOVE_PMU, pmu_irq_handler);
129 }
130