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edabd38e SB |
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> | |
ce91574c | 21 | #include <plat/orion-gpio.h> |
edabd38e SB |
22 | #include "common.h" |
23 | ||
aa456a6e | 24 | static void pmu_irq_mask(struct irq_data *d) |
edabd38e | 25 | { |
aa456a6e | 26 | int pin = irq_to_pmu(d->irq); |
edabd38e SB |
27 | u32 u; |
28 | ||
29 | u = readl(PMU_INTERRUPT_MASK); | |
30 | u &= ~(1 << (pin & 31)); | |
31 | writel(u, PMU_INTERRUPT_MASK); | |
32 | } | |
33 | ||
aa456a6e | 34 | static void pmu_irq_unmask(struct irq_data *d) |
edabd38e | 35 | { |
aa456a6e | 36 | int pin = irq_to_pmu(d->irq); |
edabd38e SB |
37 | u32 u; |
38 | ||
39 | u = readl(PMU_INTERRUPT_MASK); | |
40 | u |= 1 << (pin & 31); | |
41 | writel(u, PMU_INTERRUPT_MASK); | |
42 | } | |
43 | ||
aa456a6e | 44 | static void pmu_irq_ack(struct irq_data *d) |
edabd38e | 45 | { |
aa456a6e | 46 | int pin = irq_to_pmu(d->irq); |
edabd38e SB |
47 | u32 u; |
48 | ||
5d3df935 RKAL |
49 | /* |
50 | * The PMU mask register is not RW0C: it is RW. This means that | |
51 | * the bits take whatever value is written to them; if you write | |
52 | * a '1', you will set the interrupt. | |
53 | * | |
54 | * Unfortunately this means there is NO race free way to clear | |
55 | * these interrupts. | |
56 | * | |
57 | * So, let's structure the code so that the window is as small as | |
58 | * possible. | |
59 | */ | |
edabd38e | 60 | u = ~(1 << (pin & 31)); |
5d3df935 RKAL |
61 | u &= readl_relaxed(PMU_INTERRUPT_CAUSE); |
62 | writel_relaxed(u, PMU_INTERRUPT_CAUSE); | |
edabd38e SB |
63 | } |
64 | ||
65 | static struct irq_chip pmu_irq_chip = { | |
66 | .name = "pmu_irq", | |
aa456a6e LB |
67 | .irq_mask = pmu_irq_mask, |
68 | .irq_unmask = pmu_irq_unmask, | |
69 | .irq_ack = pmu_irq_ack, | |
edabd38e SB |
70 | }; |
71 | ||
bd0b9ac4 | 72 | static void pmu_irq_handler(struct irq_desc *desc) |
edabd38e SB |
73 | { |
74 | unsigned long cause = readl(PMU_INTERRUPT_CAUSE); | |
bd0b9ac4 | 75 | unsigned int irq; |
edabd38e SB |
76 | |
77 | cause &= readl(PMU_INTERRUPT_MASK); | |
78 | if (cause == 0) { | |
bd0b9ac4 | 79 | do_bad_IRQ(desc); |
edabd38e SB |
80 | return; |
81 | } | |
82 | ||
83 | for (irq = 0; irq < NR_PMU_IRQS; irq++) { | |
84 | if (!(cause & (1 << irq))) | |
85 | continue; | |
86 | irq = pmu_to_irq(irq); | |
cf0d6b76 | 87 | generic_handle_irq(irq); |
edabd38e SB |
88 | } |
89 | } | |
90 | ||
278b45b0 AL |
91 | static int __initdata gpio0_irqs[4] = { |
92 | IRQ_DOVE_GPIO_0_7, | |
93 | IRQ_DOVE_GPIO_8_15, | |
94 | IRQ_DOVE_GPIO_16_23, | |
95 | IRQ_DOVE_GPIO_24_31, | |
96 | }; | |
97 | ||
98 | static int __initdata gpio1_irqs[4] = { | |
99 | IRQ_DOVE_HIGH_GPIO, | |
100 | 0, | |
101 | 0, | |
102 | 0, | |
103 | }; | |
104 | ||
105 | static int __initdata gpio2_irqs[4] = { | |
106 | 0, | |
107 | 0, | |
108 | 0, | |
109 | 0, | |
110 | }; | |
111 | ||
deac3d87 TP |
112 | #ifdef CONFIG_MULTI_IRQ_HANDLER |
113 | /* | |
114 | * Compiling with both non-DT and DT support enabled, will | |
115 | * break asm irq handler used by non-DT boards. Therefore, | |
116 | * we provide a C-style irq handler even for non-DT boards, | |
117 | * if MULTI_IRQ_HANDLER is set. | |
118 | */ | |
119 | ||
120 | static void __iomem *dove_irq_base = IRQ_VIRT_BASE; | |
121 | ||
122 | static asmlinkage void | |
123 | __exception_irq_entry dove_legacy_handle_irq(struct pt_regs *regs) | |
124 | { | |
125 | u32 stat; | |
126 | ||
127 | stat = readl_relaxed(dove_irq_base + IRQ_CAUSE_LOW_OFF); | |
128 | stat &= readl_relaxed(dove_irq_base + IRQ_MASK_LOW_OFF); | |
129 | if (stat) { | |
5d6bed2a | 130 | unsigned int hwirq = 1 + __fls(stat); |
deac3d87 TP |
131 | handle_IRQ(hwirq, regs); |
132 | return; | |
133 | } | |
134 | stat = readl_relaxed(dove_irq_base + IRQ_CAUSE_HIGH_OFF); | |
135 | stat &= readl_relaxed(dove_irq_base + IRQ_MASK_HIGH_OFF); | |
136 | if (stat) { | |
5d6bed2a | 137 | unsigned int hwirq = 33 + __fls(stat); |
deac3d87 TP |
138 | handle_IRQ(hwirq, regs); |
139 | return; | |
140 | } | |
141 | } | |
142 | #endif | |
143 | ||
edabd38e SB |
144 | void __init dove_init_irq(void) |
145 | { | |
146 | int i; | |
147 | ||
5d6bed2a RK |
148 | orion_irq_init(1, IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF); |
149 | orion_irq_init(33, IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF); | |
edabd38e | 150 | |
deac3d87 TP |
151 | #ifdef CONFIG_MULTI_IRQ_HANDLER |
152 | set_handle_irq(dove_legacy_handle_irq); | |
153 | #endif | |
154 | ||
edabd38e | 155 | /* |
9eac6d0a | 156 | * Initialize gpiolib for GPIOs 0-71. |
edabd38e | 157 | */ |
c3c5a281 | 158 | orion_gpio_init(NULL, 0, 32, DOVE_GPIO_LO_VIRT_BASE, 0, |
278b45b0 AL |
159 | IRQ_DOVE_GPIO_START, gpio0_irqs); |
160 | ||
c3c5a281 | 161 | orion_gpio_init(NULL, 32, 32, DOVE_GPIO_HI_VIRT_BASE, 0, |
278b45b0 AL |
162 | IRQ_DOVE_GPIO_START + 32, gpio1_irqs); |
163 | ||
c3c5a281 | 164 | orion_gpio_init(NULL, 64, 8, DOVE_GPIO2_VIRT_BASE, 0, |
278b45b0 | 165 | IRQ_DOVE_GPIO_START + 64, gpio2_irqs); |
edabd38e SB |
166 | |
167 | /* | |
168 | * Mask and clear PMU interrupts | |
169 | */ | |
170 | writel(0, PMU_INTERRUPT_MASK); | |
171 | writel(0, PMU_INTERRUPT_CAUSE); | |
172 | ||
edabd38e | 173 | for (i = IRQ_DOVE_PMU_START; i < NR_IRQS; i++) { |
f38c02f3 | 174 | irq_set_chip_and_handler(i, &pmu_irq_chip, handle_level_irq); |
cf0d6b76 | 175 | irq_set_status_flags(i, IRQ_LEVEL); |
e8d36d5d | 176 | irq_clear_status_flags(i, IRQ_NOREQUEST); |
edabd38e | 177 | } |
6845664a | 178 | irq_set_chained_handler(IRQ_DOVE_PMU, pmu_irq_handler); |
edabd38e | 179 | } |