Commit | Line | Data |
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52c543f9 | 1 | /* |
259bcaae JB |
2 | * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. |
3 | * Copyright 2008 Juergen Beisert, kernel@pengutronix.de | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; either version 2 | |
8 | * of the License, or (at your option) any later version. | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, | |
17 | * MA 02110-1301, USA. | |
52c543f9 QJ |
18 | */ |
19 | ||
d7927e19 | 20 | #include <linux/module.h> |
259bcaae | 21 | #include <linux/irq.h> |
fced80c7 | 22 | #include <linux/io.h> |
a09e64fb | 23 | #include <mach/common.h> |
d7927e19 | 24 | #include <asm/mach/irq.h> |
98de0cbb | 25 | #include <asm/exception.h> |
a2449091 | 26 | #include <mach/hardware.h> |
52c543f9 | 27 | |
cdc3f106 PH |
28 | #include "irq-common.h" |
29 | ||
84c9fa43 SH |
30 | #define AVIC_INTCNTL 0x00 /* int control reg */ |
31 | #define AVIC_NIMASK 0x04 /* int mask reg */ | |
32 | #define AVIC_INTENNUM 0x08 /* int enable number reg */ | |
33 | #define AVIC_INTDISNUM 0x0C /* int disable number reg */ | |
34 | #define AVIC_INTENABLEH 0x10 /* int enable reg high */ | |
35 | #define AVIC_INTENABLEL 0x14 /* int enable reg low */ | |
36 | #define AVIC_INTTYPEH 0x18 /* int type reg high */ | |
37 | #define AVIC_INTTYPEL 0x1C /* int type reg low */ | |
38 | #define AVIC_NIPRIORITY(x) (0x20 + 4 * (7 - (x))) /* int priority */ | |
39 | #define AVIC_NIVECSR 0x40 /* norm int vector/status */ | |
40 | #define AVIC_FIVECSR 0x44 /* fast int vector/status */ | |
41 | #define AVIC_INTSRCH 0x48 /* int source reg high */ | |
42 | #define AVIC_INTSRCL 0x4C /* int source reg low */ | |
43 | #define AVIC_INTFRCH 0x50 /* int force reg high */ | |
44 | #define AVIC_INTFRCL 0x54 /* int force reg low */ | |
45 | #define AVIC_NIPNDH 0x58 /* norm int pending high */ | |
46 | #define AVIC_NIPNDL 0x5C /* norm int pending low */ | |
47 | #define AVIC_FIPNDH 0x60 /* fast int pending high */ | |
48 | #define AVIC_FIPNDL 0x64 /* fast int pending low */ | |
49 | ||
5a24d69c SH |
50 | #define AVIC_NUM_IRQS 64 |
51 | ||
12b8eb86 | 52 | void __iomem *avic_base; |
259bcaae | 53 | |
3439a397 HW |
54 | static u32 avic_saved_mask_reg[2]; |
55 | ||
3f203016 | 56 | #ifdef CONFIG_MXC_IRQ_PRIOR |
cdc3f106 PH |
57 | static int avic_irq_set_priority(unsigned char irq, unsigned char prio) |
58 | { | |
479c901f DA |
59 | unsigned int temp; |
60 | unsigned int mask = 0x0F << irq % 8 * 4; | |
61 | ||
5a24d69c | 62 | if (irq >= AVIC_NUM_IRQS) |
3f203016 | 63 | return -EINVAL;; |
479c901f | 64 | |
84c9fa43 | 65 | temp = __raw_readl(avic_base + AVIC_NIPRIORITY(irq / 8)); |
479c901f DA |
66 | temp &= ~mask; |
67 | temp |= prio & mask; | |
68 | ||
84c9fa43 | 69 | __raw_writel(temp, avic_base + AVIC_NIPRIORITY(irq / 8)); |
3f203016 DA |
70 | |
71 | return 0; | |
479c901f | 72 | } |
cdc3f106 | 73 | #endif |
479c901f | 74 | |
d7927e19 | 75 | #ifdef CONFIG_FIQ |
cdc3f106 | 76 | static int avic_set_irq_fiq(unsigned int irq, unsigned int type) |
d7927e19 PZ |
77 | { |
78 | unsigned int irqt; | |
79 | ||
5a24d69c | 80 | if (irq >= AVIC_NUM_IRQS) |
d7927e19 PZ |
81 | return -EINVAL; |
82 | ||
5a24d69c | 83 | if (irq < AVIC_NUM_IRQS / 2) { |
84c9fa43 SH |
84 | irqt = __raw_readl(avic_base + AVIC_INTTYPEL) & ~(1 << irq); |
85 | __raw_writel(irqt | (!!type << irq), avic_base + AVIC_INTTYPEL); | |
d7927e19 | 86 | } else { |
5a24d69c | 87 | irq -= AVIC_NUM_IRQS / 2; |
84c9fa43 SH |
88 | irqt = __raw_readl(avic_base + AVIC_INTTYPEH) & ~(1 << irq); |
89 | __raw_writel(irqt | (!!type << irq), avic_base + AVIC_INTTYPEH); | |
d7927e19 PZ |
90 | } |
91 | ||
92 | return 0; | |
93 | } | |
d7927e19 PZ |
94 | #endif /* CONFIG_FIQ */ |
95 | ||
52c543f9 | 96 | |
3439a397 | 97 | static struct mxc_extra_irq avic_extra_irq = { |
cdc3f106 PH |
98 | #ifdef CONFIG_MXC_IRQ_PRIOR |
99 | .set_priority = avic_irq_set_priority, | |
100 | #endif | |
101 | #ifdef CONFIG_FIQ | |
102 | .set_irq_fiq = avic_set_irq_fiq, | |
103 | #endif | |
52c543f9 QJ |
104 | }; |
105 | ||
3439a397 HW |
106 | #ifdef CONFIG_PM |
107 | static void avic_irq_suspend(struct irq_data *d) | |
108 | { | |
109 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
110 | struct irq_chip_type *ct = gc->chip_types; | |
111 | int idx = gc->irq_base >> 5; | |
112 | ||
113 | avic_saved_mask_reg[idx] = __raw_readl(avic_base + ct->regs.mask); | |
114 | __raw_writel(gc->wake_active, avic_base + ct->regs.mask); | |
115 | } | |
116 | ||
117 | static void avic_irq_resume(struct irq_data *d) | |
118 | { | |
119 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
120 | struct irq_chip_type *ct = gc->chip_types; | |
121 | int idx = gc->irq_base >> 5; | |
122 | ||
123 | __raw_writel(avic_saved_mask_reg[idx], avic_base + ct->regs.mask); | |
124 | } | |
125 | ||
126 | #else | |
127 | #define avic_irq_suspend NULL | |
128 | #define avic_irq_resume NULL | |
129 | #endif | |
130 | ||
131 | static __init void avic_init_gc(unsigned int irq_start) | |
132 | { | |
133 | struct irq_chip_generic *gc; | |
134 | struct irq_chip_type *ct; | |
135 | int idx = irq_start >> 5; | |
136 | ||
137 | gc = irq_alloc_generic_chip("mxc-avic", 1, irq_start, avic_base, | |
138 | handle_level_irq); | |
139 | gc->private = &avic_extra_irq; | |
140 | gc->wake_enabled = IRQ_MSK(32); | |
141 | ||
142 | ct = gc->chip_types; | |
143 | ct->chip.irq_mask = irq_gc_mask_clr_bit; | |
144 | ct->chip.irq_unmask = irq_gc_mask_set_bit; | |
145 | ct->chip.irq_ack = irq_gc_mask_clr_bit; | |
146 | ct->chip.irq_set_wake = irq_gc_set_wake; | |
147 | ct->chip.irq_suspend = avic_irq_suspend; | |
148 | ct->chip.irq_resume = avic_irq_resume; | |
149 | ct->regs.mask = !idx ? AVIC_INTENABLEL : AVIC_INTENABLEH; | |
150 | ct->regs.ack = ct->regs.mask; | |
151 | ||
152 | irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0); | |
153 | } | |
154 | ||
b6de943b SH |
155 | asmlinkage void __exception_irq_entry avic_handle_irq(struct pt_regs *regs) |
156 | { | |
157 | u32 nivector; | |
158 | ||
159 | do { | |
160 | nivector = __raw_readl(avic_base + AVIC_NIVECSR) >> 16; | |
161 | if (nivector == 0xffff) | |
162 | break; | |
163 | ||
164 | handle_IRQ(nivector, regs); | |
165 | } while (1); | |
166 | } | |
167 | ||
2c130fd5 | 168 | /* |
52c543f9 QJ |
169 | * This function initializes the AVIC hardware and disables all the |
170 | * interrupts. It registers the interrupt enable and disable functions | |
171 | * to the kernel for each interrupt source. | |
172 | */ | |
c5aa0ad0 | 173 | void __init mxc_init_irq(void __iomem *irqbase) |
52c543f9 QJ |
174 | { |
175 | int i; | |
52c543f9 | 176 | |
c5aa0ad0 | 177 | avic_base = irqbase; |
84c9fa43 | 178 | |
52c543f9 QJ |
179 | /* put the AVIC into the reset value with |
180 | * all interrupts disabled | |
181 | */ | |
84c9fa43 SH |
182 | __raw_writel(0, avic_base + AVIC_INTCNTL); |
183 | __raw_writel(0x1f, avic_base + AVIC_NIMASK); | |
52c543f9 QJ |
184 | |
185 | /* disable all interrupts */ | |
84c9fa43 SH |
186 | __raw_writel(0, avic_base + AVIC_INTENABLEH); |
187 | __raw_writel(0, avic_base + AVIC_INTENABLEL); | |
52c543f9 QJ |
188 | |
189 | /* all IRQ no FIQ */ | |
84c9fa43 SH |
190 | __raw_writel(0, avic_base + AVIC_INTTYPEH); |
191 | __raw_writel(0, avic_base + AVIC_INTTYPEL); | |
3439a397 HW |
192 | |
193 | for (i = 0; i < AVIC_NUM_IRQS; i += 32) | |
194 | avic_init_gc(i); | |
52c543f9 | 195 | |
479c901f DA |
196 | /* Set default priority value (0) for all IRQ's */ |
197 | for (i = 0; i < 8; i++) | |
84c9fa43 | 198 | __raw_writel(0, avic_base + AVIC_NIPRIORITY(i)); |
52c543f9 | 199 | |
d7927e19 PZ |
200 | #ifdef CONFIG_FIQ |
201 | /* Initialize FIQ */ | |
202 | init_FIQ(); | |
203 | #endif | |
204 | ||
52c543f9 QJ |
205 | printk(KERN_INFO "MXC IRQ initialized\n"); |
206 | } |