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9#include <linux/init.h>
10#include <linux/io.h>
11#include <linux/irq.h>
12#include <linux/of.h>
13#include <linux/of_address.h>
14#include <linux/irqdomain.h>
15#include <linux/syscore_ops.h>
16#include <asm/mach/irq.h>
17#include <asm/exception.h>
18#include "irqchip.h"
19
20#define SIRFSOC_INT_RISC_MASK0 0x0018
21#define SIRFSOC_INT_RISC_MASK1 0x001C
22#define SIRFSOC_INT_RISC_LEVEL0 0x0020
23#define SIRFSOC_INT_RISC_LEVEL1 0x0024
24#define SIRFSOC_INIT_IRQ_ID 0x0038
25
26#define SIRFSOC_NUM_IRQS 64
27
28static struct irq_domain *sirfsoc_irqdomain;
29
30static __init void
31sirfsoc_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
32{
33 struct irq_chip_generic *gc;
34 struct irq_chip_type *ct;
35 int ret;
36 unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
37 unsigned int set = IRQ_LEVEL;
38
39 ret = irq_alloc_domain_generic_chips(sirfsoc_irqdomain, num, 1, "irq_sirfsoc",
40 handle_level_irq, clr, set, IRQ_GC_INIT_MASK_CACHE);
41
42 gc = irq_get_domain_generic_chip(sirfsoc_irqdomain, irq_start);
43 gc->reg_base = base;
44 ct = gc->chip_types;
45 ct->chip.irq_mask = irq_gc_mask_clr_bit;
46 ct->chip.irq_unmask = irq_gc_mask_set_bit;
47 ct->regs.mask = SIRFSOC_INT_RISC_MASK0;
48}
49
50static asmlinkage void __exception_irq_entry sirfsoc_handle_irq(struct pt_regs *regs)
51{
52 void __iomem *base = sirfsoc_irqdomain->host_data;
53 u32 irqstat, irqnr;
54
55 irqstat = readl_relaxed(base + SIRFSOC_INIT_IRQ_ID);
56 irqnr = irq_find_mapping(sirfsoc_irqdomain, irqstat & 0xff);
57
58 handle_IRQ(irqnr, regs);
59}
60
61static int __init sirfsoc_irq_init(struct device_node *np, struct device_node *parent)
62{
63 void __iomem *base = of_iomap(np, 0);
64 if (!base)
65 panic("unable to map intc cpu registers\n");
66
67 sirfsoc_irqdomain = irq_domain_add_linear(np, SIRFSOC_NUM_IRQS,
68 &irq_generic_chip_ops, base);
69
70 sirfsoc_alloc_gc(base, 0, 32);
71 sirfsoc_alloc_gc(base + 4, 32, SIRFSOC_NUM_IRQS - 32);
72
73 writel_relaxed(0, base + SIRFSOC_INT_RISC_LEVEL0);
74 writel_relaxed(0, base + SIRFSOC_INT_RISC_LEVEL1);
75
76 writel_relaxed(0, base + SIRFSOC_INT_RISC_MASK0);
77 writel_relaxed(0, base + SIRFSOC_INT_RISC_MASK1);
78
79 set_handle_irq(sirfsoc_handle_irq);
80
81 return 0;
82}
83IRQCHIP_DECLARE(sirfsoc_intc, "sirf,prima2-intc", sirfsoc_irq_init);
84
85struct sirfsoc_irq_status {
86 u32 mask0;
87 u32 mask1;
88 u32 level0;
89 u32 level1;
90};
91
92static struct sirfsoc_irq_status sirfsoc_irq_st;
93
94static int sirfsoc_irq_suspend(void)
95{
96 void __iomem *base = sirfsoc_irqdomain->host_data;
97
98 sirfsoc_irq_st.mask0 = readl_relaxed(base + SIRFSOC_INT_RISC_MASK0);
99 sirfsoc_irq_st.mask1 = readl_relaxed(base + SIRFSOC_INT_RISC_MASK1);
100 sirfsoc_irq_st.level0 = readl_relaxed(base + SIRFSOC_INT_RISC_LEVEL0);
101 sirfsoc_irq_st.level1 = readl_relaxed(base + SIRFSOC_INT_RISC_LEVEL1);
102
103 return 0;
104}
105
106static void sirfsoc_irq_resume(void)
107{
108 void __iomem *base = sirfsoc_irqdomain->host_data;
109
110 writel_relaxed(sirfsoc_irq_st.mask0, base + SIRFSOC_INT_RISC_MASK0);
111 writel_relaxed(sirfsoc_irq_st.mask1, base + SIRFSOC_INT_RISC_MASK1);
112 writel_relaxed(sirfsoc_irq_st.level0, base + SIRFSOC_INT_RISC_LEVEL0);
113 writel_relaxed(sirfsoc_irq_st.level1, base + SIRFSOC_INT_RISC_LEVEL1);
114}
115
116static struct syscore_ops sirfsoc_irq_syscore_ops = {
117 .suspend = sirfsoc_irq_suspend,
118 .resume = sirfsoc_irq_resume,
119};
120
121static int __init sirfsoc_irq_pm_init(void)
122{
123 if (!sirfsoc_irqdomain)
124 return 0;
125
126 register_syscore_ops(&sirfsoc_irq_syscore_ops);
127 return 0;
128}
129device_initcall(sirfsoc_irq_pm_init);
130
