This source file includes following definitions.
- avic_set_irq_fiq
- avic_irq_suspend
- avic_irq_resume
- avic_init_gc
- avic_handle_irq
- mxc_init_irq
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7 #include <linux/module.h>
8 #include <linux/irq.h>
9 #include <linux/irqdomain.h>
10 #include <linux/io.h>
11 #include <linux/of.h>
12 #include <linux/of_address.h>
13 #include <asm/mach/irq.h>
14 #include <asm/exception.h>
15
16 #include "common.h"
17 #include "hardware.h"
18 #include "irq-common.h"
19
20 #define AVIC_INTCNTL 0x00
21 #define AVIC_NIMASK 0x04
22 #define AVIC_INTENNUM 0x08
23 #define AVIC_INTDISNUM 0x0C
24 #define AVIC_INTENABLEH 0x10
25 #define AVIC_INTENABLEL 0x14
26 #define AVIC_INTTYPEH 0x18
27 #define AVIC_INTTYPEL 0x1C
28 #define AVIC_NIPRIORITY(x) (0x20 + 4 * (7 - (x)))
29 #define AVIC_NIVECSR 0x40
30 #define AVIC_FIVECSR 0x44
31 #define AVIC_INTSRCH 0x48
32 #define AVIC_INTSRCL 0x4C
33 #define AVIC_INTFRCH 0x50
34 #define AVIC_INTFRCL 0x54
35 #define AVIC_NIPNDH 0x58
36 #define AVIC_NIPNDL 0x5C
37 #define AVIC_FIPNDH 0x60
38 #define AVIC_FIPNDL 0x64
39
40 #define AVIC_NUM_IRQS 64
41
42
43 #define MX25_CCM_LPIMR0 0x68
44 #define MX25_CCM_LPIMR1 0x6C
45
46 static void __iomem *avic_base;
47 static void __iomem *mx25_ccm_base;
48 static struct irq_domain *domain;
49
50 #ifdef CONFIG_FIQ
51 static int avic_set_irq_fiq(unsigned int hwirq, unsigned int type)
52 {
53 unsigned int irqt;
54
55 if (hwirq >= AVIC_NUM_IRQS)
56 return -EINVAL;
57
58 if (hwirq < AVIC_NUM_IRQS / 2) {
59 irqt = imx_readl(avic_base + AVIC_INTTYPEL) & ~(1 << hwirq);
60 imx_writel(irqt | (!!type << hwirq), avic_base + AVIC_INTTYPEL);
61 } else {
62 hwirq -= AVIC_NUM_IRQS / 2;
63 irqt = imx_readl(avic_base + AVIC_INTTYPEH) & ~(1 << hwirq);
64 imx_writel(irqt | (!!type << hwirq), avic_base + AVIC_INTTYPEH);
65 }
66
67 return 0;
68 }
69 #endif
70
71
72 static struct mxc_extra_irq avic_extra_irq = {
73 #ifdef CONFIG_FIQ
74 .set_irq_fiq = avic_set_irq_fiq,
75 #endif
76 };
77
78 #ifdef CONFIG_PM
79 static u32 avic_saved_mask_reg[2];
80
81 static void avic_irq_suspend(struct irq_data *d)
82 {
83 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
84 struct irq_chip_type *ct = gc->chip_types;
85 int idx = d->hwirq >> 5;
86
87 avic_saved_mask_reg[idx] = imx_readl(avic_base + ct->regs.mask);
88 imx_writel(gc->wake_active, avic_base + ct->regs.mask);
89
90 if (mx25_ccm_base) {
91 u8 offs = d->hwirq < AVIC_NUM_IRQS / 2 ?
92 MX25_CCM_LPIMR0 : MX25_CCM_LPIMR1;
93
94
95
96
97
98
99 imx_writel(~gc->wake_active, mx25_ccm_base + offs);
100 }
101 }
102
103 static void avic_irq_resume(struct irq_data *d)
104 {
105 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
106 struct irq_chip_type *ct = gc->chip_types;
107 int idx = d->hwirq >> 5;
108
109 imx_writel(avic_saved_mask_reg[idx], avic_base + ct->regs.mask);
110
111 if (mx25_ccm_base) {
112 u8 offs = d->hwirq < AVIC_NUM_IRQS / 2 ?
113 MX25_CCM_LPIMR0 : MX25_CCM_LPIMR1;
114
115 imx_writel(0xffffffff, mx25_ccm_base + offs);
116 }
117 }
118
119 #else
120 #define avic_irq_suspend NULL
121 #define avic_irq_resume NULL
122 #endif
123
124 static __init void avic_init_gc(int idx, unsigned int irq_start)
125 {
126 struct irq_chip_generic *gc;
127 struct irq_chip_type *ct;
128
129 gc = irq_alloc_generic_chip("mxc-avic", 1, irq_start, avic_base,
130 handle_level_irq);
131 gc->private = &avic_extra_irq;
132 gc->wake_enabled = IRQ_MSK(32);
133
134 ct = gc->chip_types;
135 ct->chip.irq_mask = irq_gc_mask_clr_bit;
136 ct->chip.irq_unmask = irq_gc_mask_set_bit;
137 ct->chip.irq_ack = irq_gc_mask_clr_bit;
138 ct->chip.irq_set_wake = irq_gc_set_wake;
139 ct->chip.irq_suspend = avic_irq_suspend;
140 ct->chip.irq_resume = avic_irq_resume;
141 ct->regs.mask = !idx ? AVIC_INTENABLEL : AVIC_INTENABLEH;
142 ct->regs.ack = ct->regs.mask;
143
144 irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0);
145 }
146
147 static void __exception_irq_entry avic_handle_irq(struct pt_regs *regs)
148 {
149 u32 nivector;
150
151 do {
152 nivector = imx_readl(avic_base + AVIC_NIVECSR) >> 16;
153 if (nivector == 0xffff)
154 break;
155
156 handle_domain_irq(domain, nivector, regs);
157 } while (1);
158 }
159
160
161
162
163
164
165 void __init mxc_init_irq(void __iomem *irqbase)
166 {
167 struct device_node *np;
168 int irq_base;
169 int i;
170
171 avic_base = irqbase;
172
173 np = of_find_compatible_node(NULL, NULL, "fsl,imx25-ccm");
174 mx25_ccm_base = of_iomap(np, 0);
175
176 if (mx25_ccm_base) {
177
178
179
180
181 imx_writel(0xffffffff, mx25_ccm_base + MX25_CCM_LPIMR0);
182 imx_writel(0xffffffff, mx25_ccm_base + MX25_CCM_LPIMR1);
183 }
184
185
186
187
188 imx_writel(0, avic_base + AVIC_INTCNTL);
189 imx_writel(0x1f, avic_base + AVIC_NIMASK);
190
191
192 imx_writel(0, avic_base + AVIC_INTENABLEH);
193 imx_writel(0, avic_base + AVIC_INTENABLEL);
194
195
196 imx_writel(0, avic_base + AVIC_INTTYPEH);
197 imx_writel(0, avic_base + AVIC_INTTYPEL);
198
199 irq_base = irq_alloc_descs(-1, 0, AVIC_NUM_IRQS, numa_node_id());
200 WARN_ON(irq_base < 0);
201
202 np = of_find_compatible_node(NULL, NULL, "fsl,avic");
203 domain = irq_domain_add_legacy(np, AVIC_NUM_IRQS, irq_base, 0,
204 &irq_domain_simple_ops, NULL);
205 WARN_ON(!domain);
206
207 for (i = 0; i < AVIC_NUM_IRQS / 32; i++, irq_base += 32)
208 avic_init_gc(i, irq_base);
209
210
211 for (i = 0; i < 8; i++)
212 imx_writel(0, avic_base + AVIC_NIPRIORITY(i));
213
214 set_handle_irq(avic_handle_irq);
215
216 #ifdef CONFIG_FIQ
217
218 init_FIQ(FIQ_START);
219 #endif
220
221 printk(KERN_INFO "MXC IRQ initialized\n");
222 }