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73a59c1c SP |
1 | /* |
2 | * linux/arch/arm/mach-at91rm9200/irq.c | |
3 | * | |
4 | * Copyright (C) 2004 SAN People | |
5 | * Copyright (C) 2004 ATMEL | |
6 | * Copyright (C) Rick Bronson | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | #include <linux/config.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/mm.h> | |
27 | #include <linux/types.h> | |
28 | ||
29 | #include <asm/hardware.h> | |
30 | #include <asm/irq.h> | |
31 | #include <asm/mach-types.h> | |
32 | #include <asm/setup.h> | |
33 | ||
34 | #include <asm/mach/arch.h> | |
35 | #include <asm/mach/irq.h> | |
36 | #include <asm/mach/map.h> | |
37 | ||
38 | #include "generic.h" | |
39 | ||
40 | /* | |
41 | * The default interrupt priority levels (0 = lowest, 7 = highest). | |
42 | */ | |
43 | static unsigned int at91rm9200_default_irq_priority[NR_AIC_IRQS] __initdata = { | |
44 | 7, /* Advanced Interrupt Controller */ | |
45 | 7, /* System Peripheral */ | |
46 | 0, /* Parallel IO Controller A */ | |
47 | 0, /* Parallel IO Controller B */ | |
48 | 0, /* Parallel IO Controller C */ | |
49 | 0, /* Parallel IO Controller D */ | |
50 | 6, /* USART 0 */ | |
51 | 6, /* USART 1 */ | |
52 | 6, /* USART 2 */ | |
53 | 6, /* USART 3 */ | |
54 | 0, /* Multimedia Card Interface */ | |
55 | 4, /* USB Device Port */ | |
56 | 0, /* Two-Wire Interface */ | |
57 | 6, /* Serial Peripheral Interface */ | |
58 | 5, /* Serial Synchronous Controller */ | |
59 | 5, /* Serial Synchronous Controller */ | |
60 | 5, /* Serial Synchronous Controller */ | |
61 | 0, /* Timer Counter 0 */ | |
62 | 0, /* Timer Counter 1 */ | |
63 | 0, /* Timer Counter 2 */ | |
64 | 0, /* Timer Counter 3 */ | |
65 | 0, /* Timer Counter 4 */ | |
66 | 0, /* Timer Counter 5 */ | |
67 | 3, /* USB Host port */ | |
68 | 3, /* Ethernet MAC */ | |
69 | 0, /* Advanced Interrupt Controller */ | |
70 | 0, /* Advanced Interrupt Controller */ | |
71 | 0, /* Advanced Interrupt Controller */ | |
72 | 0, /* Advanced Interrupt Controller */ | |
73 | 0, /* Advanced Interrupt Controller */ | |
74 | 0, /* Advanced Interrupt Controller */ | |
75 | 0 /* Advanced Interrupt Controller */ | |
76 | }; | |
77 | ||
78 | ||
79 | static void at91rm9200_mask_irq(unsigned int irq) | |
80 | { | |
81 | /* Disable interrupt on AIC */ | |
82 | at91_sys_write(AT91_AIC_IDCR, 1 << irq); | |
83 | } | |
84 | ||
85 | static void at91rm9200_unmask_irq(unsigned int irq) | |
86 | { | |
87 | /* Enable interrupt on AIC */ | |
88 | at91_sys_write(AT91_AIC_IECR, 1 << irq); | |
89 | } | |
90 | ||
91 | static int at91rm9200_irq_type(unsigned irq, unsigned type) | |
92 | { | |
93 | unsigned int smr, srctype; | |
94 | ||
73a59c1c SP |
95 | switch (type) { |
96 | case IRQT_HIGH: | |
97 | srctype = AT91_AIC_SRCTYPE_HIGH; | |
98 | break; | |
99 | case IRQT_RISING: | |
100 | srctype = AT91_AIC_SRCTYPE_RISING; | |
101 | break; | |
102 | case IRQT_LOW: | |
37f2e4bc AV |
103 | if ((irq > AT91_ID_FIQ) && (irq < AT91_ID_IRQ0)) /* only supported on external interrupts */ |
104 | return -EINVAL; | |
73a59c1c SP |
105 | srctype = AT91_AIC_SRCTYPE_LOW; |
106 | break; | |
107 | case IRQT_FALLING: | |
37f2e4bc AV |
108 | if ((irq > AT91_ID_FIQ) && (irq < AT91_ID_IRQ0)) /* only supported on external interrupts */ |
109 | return -EINVAL; | |
73a59c1c SP |
110 | srctype = AT91_AIC_SRCTYPE_FALLING; |
111 | break; | |
112 | default: | |
113 | return -EINVAL; | |
114 | } | |
115 | ||
116 | smr = at91_sys_read(AT91_AIC_SMR(irq)) & ~AT91_AIC_SRCTYPE; | |
117 | at91_sys_write(AT91_AIC_SMR(irq), smr | srctype); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static struct irqchip at91rm9200_irq_chip = { | |
122 | .ack = at91rm9200_mask_irq, | |
123 | .mask = at91rm9200_mask_irq, | |
124 | .unmask = at91rm9200_unmask_irq, | |
125 | .set_type = at91rm9200_irq_type, | |
126 | }; | |
127 | ||
128 | /* | |
129 | * Initialize the AIC interrupt controller. | |
130 | */ | |
131 | void __init at91rm9200_init_irq(unsigned int priority[NR_AIC_IRQS]) | |
132 | { | |
133 | unsigned int i; | |
134 | ||
135 | /* No priority list specified for this board -> use defaults */ | |
136 | if (priority == NULL) | |
137 | priority = at91rm9200_default_irq_priority; | |
138 | ||
139 | /* | |
140 | * The IVR is used by macro get_irqnr_and_base to read and verify. | |
141 | * The irq number is NR_AIC_IRQS when a spurious interrupt has occurred. | |
142 | */ | |
143 | for (i = 0; i < NR_AIC_IRQS; i++) { | |
144 | /* Put irq number in Source Vector Register: */ | |
145 | at91_sys_write(AT91_AIC_SVR(i), i); | |
146 | /* Store the Source Mode Register as defined in table above */ | |
147 | at91_sys_write(AT91_AIC_SMR(i), AT91_AIC_SRCTYPE_LOW | priority[i]); | |
148 | ||
149 | set_irq_chip(i, &at91rm9200_irq_chip); | |
150 | set_irq_handler(i, do_level_IRQ); | |
151 | set_irq_flags(i, IRQF_VALID | IRQF_PROBE); | |
152 | ||
153 | /* Perform 8 End Of Interrupt Command to make sure AIC will not Lock out nIRQ */ | |
154 | if (i < 8) | |
155 | at91_sys_write(AT91_AIC_EOICR, 0); | |
156 | } | |
157 | ||
158 | /* | |
159 | * Spurious Interrupt ID in Spurious Vector Register is NR_AIC_IRQS | |
160 | * When there is no current interrupt, the IRQ Vector Register reads the value stored in AIC_SPU | |
161 | */ | |
162 | at91_sys_write(AT91_AIC_SPU, NR_AIC_IRQS); | |
163 | ||
164 | /* No debugging in AIC: Debug (Protect) Control Register */ | |
165 | at91_sys_write(AT91_AIC_DCR, 0); | |
166 | ||
167 | /* Disable and clear all interrupts initially */ | |
168 | at91_sys_write(AT91_AIC_IDCR, 0xFFFFFFFF); | |
169 | at91_sys_write(AT91_AIC_ICCR, 0xFFFFFFFF); | |
170 | } |