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45051539 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b06eb017 CR |
2 | /* |
3 | * Abilis Systems interrupt controller driver | |
4 | * | |
5 | * Copyright (C) Abilis Systems 2012 | |
6 | * | |
7 | * Author: Christian Ruppert <christian.ruppert@abilis.com> | |
b06eb017 CR |
8 | */ |
9 | ||
10 | #include <linux/interrupt.h> | |
11 | #include <linux/irqdomain.h> | |
12 | #include <linux/irq.h> | |
41a83e06 | 13 | #include <linux/irqchip.h> |
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14 | #include <linux/of_irq.h> |
15 | #include <linux/of_address.h> | |
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16 | #include <linux/io.h> |
17 | #include <linux/slab.h> | |
18 | #include <linux/bitops.h> | |
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19 | |
20 | #define AB_IRQCTL_INT_ENABLE 0x00 | |
21 | #define AB_IRQCTL_INT_STATUS 0x04 | |
22 | #define AB_IRQCTL_SRC_MODE 0x08 | |
23 | #define AB_IRQCTL_SRC_POLARITY 0x0C | |
24 | #define AB_IRQCTL_INT_MODE 0x10 | |
25 | #define AB_IRQCTL_INT_POLARITY 0x14 | |
26 | #define AB_IRQCTL_INT_FORCE 0x18 | |
27 | ||
28 | #define AB_IRQCTL_MAXIRQ 32 | |
29 | ||
30 | static inline void ab_irqctl_writereg(struct irq_chip_generic *gc, u32 reg, | |
31 | u32 val) | |
32 | { | |
332fd7c4 | 33 | irq_reg_writel(gc, val, reg); |
b06eb017 CR |
34 | } |
35 | ||
36 | static inline u32 ab_irqctl_readreg(struct irq_chip_generic *gc, u32 reg) | |
37 | { | |
332fd7c4 | 38 | return irq_reg_readl(gc, reg); |
b06eb017 CR |
39 | } |
40 | ||
41 | static int tb10x_irq_set_type(struct irq_data *data, unsigned int flow_type) | |
42 | { | |
43 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); | |
44 | uint32_t im, mod, pol; | |
45 | ||
46 | im = data->mask; | |
47 | ||
48 | irq_gc_lock(gc); | |
49 | ||
50 | mod = ab_irqctl_readreg(gc, AB_IRQCTL_SRC_MODE) | im; | |
51 | pol = ab_irqctl_readreg(gc, AB_IRQCTL_SRC_POLARITY) | im; | |
52 | ||
53 | switch (flow_type & IRQF_TRIGGER_MASK) { | |
54 | case IRQ_TYPE_EDGE_FALLING: | |
55 | pol ^= im; | |
56 | break; | |
57 | case IRQ_TYPE_LEVEL_HIGH: | |
58 | mod ^= im; | |
59 | break; | |
60 | case IRQ_TYPE_NONE: | |
61 | flow_type = IRQ_TYPE_LEVEL_LOW; | |
a6992bbe | 62 | fallthrough; |
b06eb017 CR |
63 | case IRQ_TYPE_LEVEL_LOW: |
64 | mod ^= im; | |
65 | pol ^= im; | |
66 | break; | |
67 | case IRQ_TYPE_EDGE_RISING: | |
68 | break; | |
69 | default: | |
70 | irq_gc_unlock(gc); | |
71 | pr_err("%s: Cannot assign multiple trigger modes to IRQ %d.\n", | |
72 | __func__, data->irq); | |
73 | return -EBADR; | |
74 | } | |
75 | ||
76 | irqd_set_trigger_type(data, flow_type); | |
77 | irq_setup_alt_chip(data, flow_type); | |
78 | ||
79 | ab_irqctl_writereg(gc, AB_IRQCTL_SRC_MODE, mod); | |
80 | ab_irqctl_writereg(gc, AB_IRQCTL_SRC_POLARITY, pol); | |
81 | ab_irqctl_writereg(gc, AB_IRQCTL_INT_STATUS, im); | |
82 | ||
83 | irq_gc_unlock(gc); | |
84 | ||
85 | return IRQ_SET_MASK_OK; | |
86 | } | |
87 | ||
bd0b9ac4 | 88 | static void tb10x_irq_cascade(struct irq_desc *desc) |
b06eb017 CR |
89 | { |
90 | struct irq_domain *domain = irq_desc_get_handler_data(desc); | |
e616e9af | 91 | unsigned int irq = irq_desc_get_irq(desc); |
b06eb017 | 92 | |
046a6ee2 | 93 | generic_handle_domain_irq(domain, irq); |
b06eb017 CR |
94 | } |
95 | ||
96 | static int __init of_tb10x_init_irq(struct device_node *ictl, | |
97 | struct device_node *parent) | |
98 | { | |
99 | int i, ret, nrirqs = of_irq_count(ictl); | |
100 | struct resource mem; | |
101 | struct irq_chip_generic *gc; | |
102 | struct irq_domain *domain; | |
103 | void __iomem *reg_base; | |
104 | ||
105 | if (of_address_to_resource(ictl, 0, &mem)) { | |
2ef790dc RH |
106 | pr_err("%pOFn: No registers declared in DeviceTree.\n", |
107 | ictl); | |
b06eb017 CR |
108 | return -EINVAL; |
109 | } | |
110 | ||
111 | if (!request_mem_region(mem.start, resource_size(&mem), | |
2ef790dc RH |
112 | ictl->full_name)) { |
113 | pr_err("%pOFn: Request mem region failed.\n", ictl); | |
b06eb017 CR |
114 | return -EBUSY; |
115 | } | |
116 | ||
117 | reg_base = ioremap(mem.start, resource_size(&mem)); | |
118 | if (!reg_base) { | |
119 | ret = -EBUSY; | |
2ef790dc | 120 | pr_err("%pOFn: ioremap failed.\n", ictl); |
b06eb017 CR |
121 | goto ioremap_fail; |
122 | } | |
123 | ||
124 | domain = irq_domain_add_linear(ictl, AB_IRQCTL_MAXIRQ, | |
125 | &irq_generic_chip_ops, NULL); | |
126 | if (!domain) { | |
127 | ret = -ENOMEM; | |
2ef790dc RH |
128 | pr_err("%pOFn: Could not register interrupt domain.\n", |
129 | ictl); | |
b06eb017 CR |
130 | goto irq_domain_add_fail; |
131 | } | |
132 | ||
133 | ret = irq_alloc_domain_generic_chips(domain, AB_IRQCTL_MAXIRQ, | |
134 | 2, ictl->name, handle_level_irq, | |
135 | IRQ_NOREQUEST, IRQ_NOPROBE, | |
136 | IRQ_GC_INIT_MASK_CACHE); | |
137 | if (ret) { | |
2ef790dc RH |
138 | pr_err("%pOFn: Could not allocate generic interrupt chip.\n", |
139 | ictl); | |
b06eb017 CR |
140 | goto gc_alloc_fail; |
141 | } | |
142 | ||
143 | gc = domain->gc->gc[0]; | |
144 | gc->reg_base = reg_base; | |
145 | ||
146 | gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK; | |
147 | gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit; | |
148 | gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit; | |
149 | gc->chip_types[0].chip.irq_set_type = tb10x_irq_set_type; | |
150 | gc->chip_types[0].regs.mask = AB_IRQCTL_INT_ENABLE; | |
151 | ||
152 | gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH; | |
b06eb017 CR |
153 | gc->chip_types[1].chip.irq_ack = irq_gc_ack_set_bit; |
154 | gc->chip_types[1].chip.irq_mask = irq_gc_mask_clr_bit; | |
155 | gc->chip_types[1].chip.irq_unmask = irq_gc_mask_set_bit; | |
156 | gc->chip_types[1].chip.irq_set_type = tb10x_irq_set_type; | |
157 | gc->chip_types[1].regs.ack = AB_IRQCTL_INT_STATUS; | |
158 | gc->chip_types[1].regs.mask = AB_IRQCTL_INT_ENABLE; | |
159 | gc->chip_types[1].handler = handle_edge_irq; | |
160 | ||
161 | for (i = 0; i < nrirqs; i++) { | |
162 | unsigned int irq = irq_of_parse_and_map(ictl, i); | |
163 | ||
22890b0d TG |
164 | irq_set_chained_handler_and_data(irq, tb10x_irq_cascade, |
165 | domain); | |
b06eb017 CR |
166 | } |
167 | ||
168 | ab_irqctl_writereg(gc, AB_IRQCTL_INT_ENABLE, 0); | |
169 | ab_irqctl_writereg(gc, AB_IRQCTL_INT_MODE, 0); | |
170 | ab_irqctl_writereg(gc, AB_IRQCTL_INT_POLARITY, 0); | |
171 | ab_irqctl_writereg(gc, AB_IRQCTL_INT_STATUS, ~0UL); | |
172 | ||
173 | return 0; | |
174 | ||
175 | gc_alloc_fail: | |
176 | irq_domain_remove(domain); | |
177 | irq_domain_add_fail: | |
178 | iounmap(reg_base); | |
179 | ioremap_fail: | |
180 | release_mem_region(mem.start, resource_size(&mem)); | |
181 | return ret; | |
182 | } | |
183 | IRQCHIP_DECLARE(tb10x_intc, "abilis,tb10x-ictl", of_tb10x_init_irq); |