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1da177e4 LT |
1 | /* irq-mb93493.c: MB93493 companion chip interrupt handler |
2 | * | |
1bcbba30 | 3 | * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. |
1da177e4 LT |
4 | * Written by David Howells (dhowells@redhat.com) |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/ptrace.h> |
13 | #include <linux/errno.h> | |
14 | #include <linux/signal.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/ioport.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/irq.h> | |
1977f032 | 20 | #include <linux/bitops.h> |
1da177e4 LT |
21 | |
22 | #include <asm/io.h> | |
1da177e4 LT |
23 | #include <asm/delay.h> |
24 | #include <asm/irq.h> | |
25 | #include <asm/irc-regs.h> | |
1da177e4 | 26 | #include <asm/mb93493-irqs.h> |
1bcbba30 | 27 | #include <asm/mb93493-regs.h> |
1da177e4 | 28 | |
1bcbba30 DH |
29 | #define IRQ_ROUTE_ONE(X) (X##_ROUTE << (X - IRQ_BASE_MB93493)) |
30 | ||
31 | #define IRQ_ROUTING \ | |
32 | (IRQ_ROUTE_ONE(IRQ_MB93493_VDC) | \ | |
33 | IRQ_ROUTE_ONE(IRQ_MB93493_VCC) | \ | |
34 | IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_OUT) | \ | |
35 | IRQ_ROUTE_ONE(IRQ_MB93493_I2C_0) | \ | |
36 | IRQ_ROUTE_ONE(IRQ_MB93493_I2C_1) | \ | |
37 | IRQ_ROUTE_ONE(IRQ_MB93493_USB) | \ | |
38 | IRQ_ROUTE_ONE(IRQ_MB93493_LOCAL_BUS) | \ | |
39 | IRQ_ROUTE_ONE(IRQ_MB93493_PCMCIA) | \ | |
40 | IRQ_ROUTE_ONE(IRQ_MB93493_GPIO) | \ | |
41 | IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_IN)) | |
1da177e4 | 42 | |
1da177e4 | 43 | /* |
1bcbba30 | 44 | * daughter board PIC operations |
88d6e199 | 45 | * - there is no way to ACK interrupts in the MB93493 chip |
1da177e4 | 46 | */ |
a55174f1 | 47 | static void frv_mb93493_mask(struct irq_data *d) |
1da177e4 | 48 | { |
1da177e4 | 49 | uint32_t iqsr; |
1bcbba30 | 50 | volatile void *piqsr; |
1da177e4 | 51 | |
a55174f1 | 52 | if (IRQ_ROUTING & (1 << (d->irq - IRQ_BASE_MB93493))) |
1bcbba30 | 53 | piqsr = __addr_MB93493_IQSR(1); |
1da177e4 | 54 | else |
1bcbba30 | 55 | piqsr = __addr_MB93493_IQSR(0); |
1da177e4 | 56 | |
1bcbba30 | 57 | iqsr = readl(piqsr); |
a55174f1 | 58 | iqsr &= ~(1 << (d->irq - IRQ_BASE_MB93493 + 16)); |
1bcbba30 DH |
59 | writel(iqsr, piqsr); |
60 | } | |
61 | ||
a55174f1 | 62 | static void frv_mb93493_ack(struct irq_data *d) |
88d6e199 DH |
63 | { |
64 | } | |
65 | ||
a55174f1 | 66 | static void frv_mb93493_unmask(struct irq_data *d) |
1bcbba30 DH |
67 | { |
68 | uint32_t iqsr; | |
69 | volatile void *piqsr; | |
70 | ||
a55174f1 | 71 | if (IRQ_ROUTING & (1 << (d->irq - IRQ_BASE_MB93493))) |
1bcbba30 | 72 | piqsr = __addr_MB93493_IQSR(1); |
1da177e4 | 73 | else |
1bcbba30 | 74 | piqsr = __addr_MB93493_IQSR(0); |
1da177e4 | 75 | |
1bcbba30 | 76 | iqsr = readl(piqsr); |
a55174f1 | 77 | iqsr |= 1 << (d->irq - IRQ_BASE_MB93493 + 16); |
1bcbba30 | 78 | writel(iqsr, piqsr); |
1da177e4 LT |
79 | } |
80 | ||
1bcbba30 DH |
81 | static struct irq_chip frv_mb93493_pic = { |
82 | .name = "mb93093", | |
a55174f1 TG |
83 | .irq_ack = frv_mb93493_ack, |
84 | .irq_mask = frv_mb93493_mask, | |
85 | .irq_mask_ack = frv_mb93493_mask, | |
86 | .irq_unmask = frv_mb93493_unmask, | |
1bcbba30 DH |
87 | }; |
88 | ||
89 | /* | |
90 | * MB93493 PIC interrupt handler | |
91 | */ | |
7d12e780 | 92 | static irqreturn_t mb93493_interrupt(int irq, void *_piqsr) |
1da177e4 | 93 | { |
1bcbba30 | 94 | volatile void *piqsr = _piqsr; |
1bcbba30 DH |
95 | uint32_t iqsr; |
96 | ||
97 | iqsr = readl(piqsr); | |
98 | iqsr = iqsr & (iqsr >> 16) & 0xffff; | |
99 | ||
100 | /* poll all the triggered IRQs */ | |
101 | while (iqsr) { | |
102 | int irq; | |
103 | ||
104 | asm("scan %1,gr0,%0" : "=r"(irq) : "r"(iqsr)); | |
105 | irq = 31 - irq; | |
106 | iqsr &= ~(1 << irq); | |
107 | ||
7d12e780 | 108 | generic_handle_irq(IRQ_BASE_MB93493 + irq); |
1bcbba30 DH |
109 | } |
110 | ||
88d6e199 | 111 | return IRQ_HANDLED; |
1da177e4 LT |
112 | } |
113 | ||
1bcbba30 DH |
114 | /* |
115 | * define an interrupt action for each MB93493 PIC output | |
116 | * - use dev_id to indicate the MB93493 PIC input to output mappings | |
117 | */ | |
118 | static struct irqaction mb93493_irq[2] = { | |
119 | [0] = { | |
120 | .handler = mb93493_interrupt, | |
08e4cf4b | 121 | .flags = IRQF_SHARED, |
1bcbba30 DH |
122 | .name = "mb93493.0", |
123 | .dev_id = (void *) __addr_MB93493_IQSR(0), | |
124 | }, | |
125 | [1] = { | |
126 | .handler = mb93493_interrupt, | |
08e4cf4b | 127 | .flags = IRQF_SHARED, |
1bcbba30 DH |
128 | .name = "mb93493.1", |
129 | .dev_id = (void *) __addr_MB93493_IQSR(1), | |
130 | } | |
131 | }; | |
132 | ||
133 | /* | |
134 | * initialise the motherboard MB93493's PIC | |
135 | */ | |
136 | void __init mb93493_init(void) | |
1da177e4 | 137 | { |
1bcbba30 DH |
138 | int irq; |
139 | ||
140 | for (irq = IRQ_BASE_MB93493 + 0; irq <= IRQ_BASE_MB93493 + 10; irq++) | |
de2e95a6 TG |
141 | irq_set_chip_and_handler(irq, &frv_mb93493_pic, |
142 | handle_edge_irq); | |
1bcbba30 DH |
143 | |
144 | /* the MB93493 drives external IRQ inputs on the CPU PIC */ | |
145 | setup_irq(IRQ_CPU_MB93493_0, &mb93493_irq[0]); | |
146 | setup_irq(IRQ_CPU_MB93493_1, &mb93493_irq[1]); | |
1da177e4 | 147 | } |