1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2005-2017 Andes Technology Corporation
3
4 #include <linux/irq.h>
5 #include <linux/of.h>
6 #include <linux/of_irq.h>
7 #include <linux/of_address.h>
8 #include <linux/interrupt.h>
9 #include <linux/irqdomain.h>
10 #include <linux/irqchip.h>
11 #include <nds32_intrinsic.h>
12
13 unsigned long wake_mask;
14
ativic32_ack_irq(struct irq_data * data)15 static void ativic32_ack_irq(struct irq_data *data)
16 {
17 __nds32__mtsr_dsb(BIT(data->hwirq), NDS32_SR_INT_PEND2);
18 }
19
ativic32_mask_irq(struct irq_data * data)20 static void ativic32_mask_irq(struct irq_data *data)
21 {
22 unsigned long int_mask2 = __nds32__mfsr(NDS32_SR_INT_MASK2);
23 __nds32__mtsr_dsb(int_mask2 & (~(BIT(data->hwirq))), NDS32_SR_INT_MASK2);
24 }
25
ativic32_unmask_irq(struct irq_data * data)26 static void ativic32_unmask_irq(struct irq_data *data)
27 {
28 unsigned long int_mask2 = __nds32__mfsr(NDS32_SR_INT_MASK2);
29 __nds32__mtsr_dsb(int_mask2 | (BIT(data->hwirq)), NDS32_SR_INT_MASK2);
30 }
31
nointc_set_wake(struct irq_data * data,unsigned int on)32 static int nointc_set_wake(struct irq_data *data, unsigned int on)
33 {
34 unsigned long int_mask = __nds32__mfsr(NDS32_SR_INT_MASK);
35 static unsigned long irq_orig_bit;
36 u32 bit = 1 << data->hwirq;
37
38 if (on) {
39 if (int_mask & bit)
40 __assign_bit(data->hwirq, &irq_orig_bit, true);
41 else
42 __assign_bit(data->hwirq, &irq_orig_bit, false);
43
44 __assign_bit(data->hwirq, &int_mask, true);
45 __assign_bit(data->hwirq, &wake_mask, true);
46
47 } else {
48 if (!(irq_orig_bit & bit))
49 __assign_bit(data->hwirq, &int_mask, false);
50
51 __assign_bit(data->hwirq, &wake_mask, false);
52 __assign_bit(data->hwirq, &irq_orig_bit, false);
53 }
54
55 __nds32__mtsr_dsb(int_mask, NDS32_SR_INT_MASK);
56
57 return 0;
58 }
59
60 static struct irq_chip ativic32_chip = {
61 .name = "ativic32",
62 .irq_ack = ativic32_ack_irq,
63 .irq_mask = ativic32_mask_irq,
64 .irq_unmask = ativic32_unmask_irq,
65 .irq_set_wake = nointc_set_wake,
66 };
67
68 static unsigned int __initdata nivic_map[6] = { 6, 2, 10, 16, 24, 32 };
69
70 static struct irq_domain *root_domain;
ativic32_irq_domain_map(struct irq_domain * id,unsigned int virq,irq_hw_number_t hw)71 static int ativic32_irq_domain_map(struct irq_domain *id, unsigned int virq,
72 irq_hw_number_t hw)
73 {
74
75 unsigned long int_trigger_type;
76 u32 type;
77 struct irq_data *irq_data;
78 int_trigger_type = __nds32__mfsr(NDS32_SR_INT_TRIGGER);
79 irq_data = irq_get_irq_data(virq);
80 if (!irq_data)
81 return -EINVAL;
82
83 if (int_trigger_type & (BIT(hw))) {
84 irq_set_chip_and_handler(virq, &ativic32_chip, handle_edge_irq);
85 type = IRQ_TYPE_EDGE_RISING;
86 } else {
87 irq_set_chip_and_handler(virq, &ativic32_chip, handle_level_irq);
88 type = IRQ_TYPE_LEVEL_HIGH;
89 }
90
91 irqd_set_trigger_type(irq_data, type);
92 return 0;
93 }
94
95 static const struct irq_domain_ops ativic32_ops = {
96 .map = ativic32_irq_domain_map,
97 .xlate = irq_domain_xlate_onecell
98 };
99
get_intr_src(void)100 static irq_hw_number_t get_intr_src(void)
101 {
102 return ((__nds32__mfsr(NDS32_SR_ITYPE) & ITYPE_mskVECTOR) >> ITYPE_offVECTOR)
103 - NDS32_VECTOR_offINTERRUPT;
104 }
105
asm_do_IRQ(struct pt_regs * regs)106 asmlinkage void asm_do_IRQ(struct pt_regs *regs)
107 {
108 irq_hw_number_t hwirq = get_intr_src();
109 handle_domain_irq(root_domain, hwirq, regs);
110 }
111
ativic32_init_irq(struct device_node * node,struct device_node * parent)112 int __init ativic32_init_irq(struct device_node *node, struct device_node *parent)
113 {
114 unsigned long int_vec_base, nivic, nr_ints;
115
116 if (WARN(parent, "non-root ativic32 are not supported"))
117 return -EINVAL;
118
119 int_vec_base = __nds32__mfsr(NDS32_SR_IVB);
120
121 if (((int_vec_base & IVB_mskIVIC_VER) >> IVB_offIVIC_VER) == 0)
122 panic("Unable to use atcivic32 for this cpu.\n");
123
124 nivic = (int_vec_base & IVB_mskNIVIC) >> IVB_offNIVIC;
125 if (nivic >= ARRAY_SIZE(nivic_map))
126 panic("The number of input for ativic32 is not supported.\n");
127
128 nr_ints = nivic_map[nivic];
129
130 root_domain = irq_domain_add_linear(node, nr_ints,
131 &ativic32_ops, NULL);
132
133 if (!root_domain)
134 panic("%s: unable to create IRQ domain\n", node->full_name);
135
136 return 0;
137 }
138 IRQCHIP_DECLARE(ativic32, "andestech,ativic32", ativic32_init_irq);
139