1 /*
2 * interrupt controller support for CSR SiRFprimaII
3 *
4 * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
5 *
6 * Licensed under GPLv2 or later.
7 */
8
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/irqchip.h>
15 #include <linux/irqdomain.h>
16 #include <linux/syscore_ops.h>
17 #include <asm/mach/irq.h>
18 #include <asm/exception.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 #define SIRFSOC_INT_BASE_OFFSET 0x0004
26
27 #define SIRFSOC_NUM_IRQS 64
28 #define SIRFSOC_NUM_BANKS (SIRFSOC_NUM_IRQS / 32)
29
30 static struct irq_domain *sirfsoc_irqdomain;
31
sirfsoc_alloc_gc(void __iomem * base)32 static __init void sirfsoc_alloc_gc(void __iomem *base)
33 {
34 unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
35 unsigned int set = IRQ_LEVEL;
36 struct irq_chip_generic *gc;
37 struct irq_chip_type *ct;
38 int i;
39
40 irq_alloc_domain_generic_chips(sirfsoc_irqdomain, 32, 1, "irq_sirfsoc",
41 handle_level_irq, clr, set,
42 IRQ_GC_INIT_MASK_CACHE);
43
44 for (i = 0; i < SIRFSOC_NUM_BANKS; i++) {
45 gc = irq_get_domain_generic_chip(sirfsoc_irqdomain, i * 32);
46 gc->reg_base = base + i * SIRFSOC_INT_BASE_OFFSET;
47 ct = gc->chip_types;
48 ct->chip.irq_mask = irq_gc_mask_clr_bit;
49 ct->chip.irq_unmask = irq_gc_mask_set_bit;
50 ct->regs.mask = SIRFSOC_INT_RISC_MASK0;
51 }
52 }
53
sirfsoc_handle_irq(struct pt_regs * regs)54 static void __exception_irq_entry sirfsoc_handle_irq(struct pt_regs *regs)
55 {
56 void __iomem *base = sirfsoc_irqdomain->host_data;
57 u32 irqstat;
58
59 irqstat = readl_relaxed(base + SIRFSOC_INIT_IRQ_ID);
60 handle_domain_irq(sirfsoc_irqdomain, irqstat & 0xff, regs);
61 }
62
sirfsoc_irq_init(struct device_node * np,struct device_node * parent)63 static int __init sirfsoc_irq_init(struct device_node *np,
64 struct device_node *parent)
65 {
66 void __iomem *base = of_iomap(np, 0);
67 if (!base)
68 panic("unable to map intc cpu registers\n");
69
70 sirfsoc_irqdomain = irq_domain_add_linear(np, SIRFSOC_NUM_IRQS,
71 &irq_generic_chip_ops, base);
72 sirfsoc_alloc_gc(base);
73
74 writel_relaxed(0, base + SIRFSOC_INT_RISC_LEVEL0);
75 writel_relaxed(0, base + SIRFSOC_INT_RISC_LEVEL1);
76
77 writel_relaxed(0, base + SIRFSOC_INT_RISC_MASK0);
78 writel_relaxed(0, base + SIRFSOC_INT_RISC_MASK1);
79
80 set_handle_irq(sirfsoc_handle_irq);
81
82 return 0;
83 }
84 IRQCHIP_DECLARE(sirfsoc_intc, "sirf,prima2-intc", sirfsoc_irq_init);
85
86 struct sirfsoc_irq_status {
87 u32 mask0;
88 u32 mask1;
89 u32 level0;
90 u32 level1;
91 };
92
93 static struct sirfsoc_irq_status sirfsoc_irq_st;
94
sirfsoc_irq_suspend(void)95 static int sirfsoc_irq_suspend(void)
96 {
97 void __iomem *base = sirfsoc_irqdomain->host_data;
98
99 sirfsoc_irq_st.mask0 = readl_relaxed(base + SIRFSOC_INT_RISC_MASK0);
100 sirfsoc_irq_st.mask1 = readl_relaxed(base + SIRFSOC_INT_RISC_MASK1);
101 sirfsoc_irq_st.level0 = readl_relaxed(base + SIRFSOC_INT_RISC_LEVEL0);
102 sirfsoc_irq_st.level1 = readl_relaxed(base + SIRFSOC_INT_RISC_LEVEL1);
103
104 return 0;
105 }
106
sirfsoc_irq_resume(void)107 static void sirfsoc_irq_resume(void)
108 {
109 void __iomem *base = sirfsoc_irqdomain->host_data;
110
111 writel_relaxed(sirfsoc_irq_st.mask0, base + SIRFSOC_INT_RISC_MASK0);
112 writel_relaxed(sirfsoc_irq_st.mask1, base + SIRFSOC_INT_RISC_MASK1);
113 writel_relaxed(sirfsoc_irq_st.level0, base + SIRFSOC_INT_RISC_LEVEL0);
114 writel_relaxed(sirfsoc_irq_st.level1, base + SIRFSOC_INT_RISC_LEVEL1);
115 }
116
117 static struct syscore_ops sirfsoc_irq_syscore_ops = {
118 .suspend = sirfsoc_irq_suspend,
119 .resume = sirfsoc_irq_resume,
120 };
121
sirfsoc_irq_pm_init(void)122 static int __init sirfsoc_irq_pm_init(void)
123 {
124 if (!sirfsoc_irqdomain)
125 return 0;
126
127 register_syscore_ops(&sirfsoc_irq_syscore_ops);
128 return 0;
129 }
130 device_initcall(sirfsoc_irq_pm_init);
131