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7f646e92 FF |
1 | /* |
2 | * Generic Broadcom Set Top Box Level 2 Interrupt controller driver | |
3 | * | |
4 | * Copyright (C) 2014 Broadcom Corporation | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
17 | ||
18 | #include <linux/init.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/platform_device.h> | |
05f12757 | 22 | #include <linux/spinlock.h> |
7f646e92 FF |
23 | #include <linux/of.h> |
24 | #include <linux/of_irq.h> | |
25 | #include <linux/of_address.h> | |
26 | #include <linux/of_platform.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/irq.h> | |
29 | #include <linux/io.h> | |
30 | #include <linux/irqdomain.h> | |
31 | #include <linux/irqchip.h> | |
32 | #include <linux/irqchip/chained_irq.h> | |
33 | ||
7f646e92 FF |
34 | /* Register offsets in the L2 interrupt controller */ |
35 | #define CPU_STATUS 0x00 | |
36 | #define CPU_SET 0x04 | |
37 | #define CPU_CLEAR 0x08 | |
38 | #define CPU_MASK_STATUS 0x0c | |
39 | #define CPU_MASK_SET 0x10 | |
40 | #define CPU_MASK_CLEAR 0x14 | |
41 | ||
42 | /* L2 intc private data structure */ | |
43 | struct brcmstb_l2_intc_data { | |
44 | int parent_irq; | |
45 | void __iomem *base; | |
46 | struct irq_domain *domain; | |
47 | bool can_wake; | |
48 | u32 saved_mask; /* for suspend/resume */ | |
49 | }; | |
50 | ||
bd0b9ac4 | 51 | static void brcmstb_l2_intc_irq_handle(struct irq_desc *desc) |
7f646e92 FF |
52 | { |
53 | struct brcmstb_l2_intc_data *b = irq_desc_get_handler_data(desc); | |
1abbdbac | 54 | struct irq_chip_generic *gc = irq_get_domain_generic_chip(b->domain, 0); |
7f646e92 | 55 | struct irq_chip *chip = irq_desc_get_chip(desc); |
bd0b9ac4 | 56 | unsigned int irq; |
7f646e92 FF |
57 | u32 status; |
58 | ||
59 | chained_irq_enter(chip, desc); | |
60 | ||
1abbdbac KC |
61 | status = irq_reg_readl(gc, CPU_STATUS) & |
62 | ~(irq_reg_readl(gc, CPU_MASK_STATUS)); | |
7f646e92 FF |
63 | |
64 | if (status == 0) { | |
05f12757 | 65 | raw_spin_lock(&desc->lock); |
bd0b9ac4 | 66 | handle_bad_irq(desc); |
05f12757 | 67 | raw_spin_unlock(&desc->lock); |
7f646e92 FF |
68 | goto out; |
69 | } | |
70 | ||
71 | do { | |
72 | irq = ffs(status) - 1; | |
73 | /* ack at our level */ | |
1abbdbac | 74 | irq_reg_writel(gc, 1 << irq, CPU_CLEAR); |
7f646e92 FF |
75 | status &= ~(1 << irq); |
76 | generic_handle_irq(irq_find_mapping(b->domain, irq)); | |
77 | } while (status); | |
78 | out: | |
79 | chained_irq_exit(chip, desc); | |
80 | } | |
81 | ||
82 | static void brcmstb_l2_intc_suspend(struct irq_data *d) | |
83 | { | |
84 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
85 | struct brcmstb_l2_intc_data *b = gc->private; | |
86 | ||
87 | irq_gc_lock(gc); | |
88 | /* Save the current mask */ | |
1abbdbac | 89 | b->saved_mask = irq_reg_readl(gc, CPU_MASK_STATUS); |
7f646e92 FF |
90 | |
91 | if (b->can_wake) { | |
92 | /* Program the wakeup mask */ | |
1abbdbac KC |
93 | irq_reg_writel(gc, ~gc->wake_active, CPU_MASK_SET); |
94 | irq_reg_writel(gc, gc->wake_active, CPU_MASK_CLEAR); | |
7f646e92 FF |
95 | } |
96 | irq_gc_unlock(gc); | |
97 | } | |
98 | ||
99 | static void brcmstb_l2_intc_resume(struct irq_data *d) | |
100 | { | |
101 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); | |
102 | struct brcmstb_l2_intc_data *b = gc->private; | |
103 | ||
104 | irq_gc_lock(gc); | |
105 | /* Clear unmasked non-wakeup interrupts */ | |
1abbdbac | 106 | irq_reg_writel(gc, ~b->saved_mask & ~gc->wake_active, CPU_CLEAR); |
7f646e92 FF |
107 | |
108 | /* Restore the saved mask */ | |
1abbdbac KC |
109 | irq_reg_writel(gc, b->saved_mask, CPU_MASK_SET); |
110 | irq_reg_writel(gc, ~b->saved_mask, CPU_MASK_CLEAR); | |
7f646e92 FF |
111 | irq_gc_unlock(gc); |
112 | } | |
113 | ||
2ae9add9 BD |
114 | static int __init brcmstb_l2_intc_of_init(struct device_node *np, |
115 | struct device_node *parent) | |
7f646e92 FF |
116 | { |
117 | unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN; | |
118 | struct brcmstb_l2_intc_data *data; | |
119 | struct irq_chip_generic *gc; | |
120 | struct irq_chip_type *ct; | |
121 | int ret; | |
1abbdbac | 122 | unsigned int flags; |
7f646e92 FF |
123 | |
124 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
125 | if (!data) | |
126 | return -ENOMEM; | |
127 | ||
128 | data->base = of_iomap(np, 0); | |
129 | if (!data->base) { | |
130 | pr_err("failed to remap intc L2 registers\n"); | |
131 | ret = -ENOMEM; | |
132 | goto out_free; | |
133 | } | |
134 | ||
135 | /* Disable all interrupts by default */ | |
1abbdbac | 136 | writel(0xffffffff, data->base + CPU_MASK_SET); |
c9ae71e0 BN |
137 | |
138 | /* Wakeup interrupts may be retained from S5 (cold boot) */ | |
139 | data->can_wake = of_property_read_bool(np, "brcm,irq-can-wake"); | |
140 | if (!data->can_wake) | |
141 | writel(0xffffffff, data->base + CPU_CLEAR); | |
7f646e92 FF |
142 | |
143 | data->parent_irq = irq_of_parse_and_map(np, 0); | |
d99ba446 | 144 | if (!data->parent_irq) { |
7f646e92 | 145 | pr_err("failed to find parent interrupt\n"); |
d99ba446 | 146 | ret = -EINVAL; |
7f646e92 FF |
147 | goto out_unmap; |
148 | } | |
149 | ||
150 | data->domain = irq_domain_add_linear(np, 32, | |
151 | &irq_generic_chip_ops, NULL); | |
152 | if (!data->domain) { | |
153 | ret = -ENOMEM; | |
154 | goto out_unmap; | |
155 | } | |
156 | ||
1abbdbac KC |
157 | /* MIPS chips strapped for BE will automagically configure the |
158 | * peripheral registers for CPU-native byte order. | |
159 | */ | |
160 | flags = 0; | |
161 | if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)) | |
162 | flags |= IRQ_GC_BE_IO; | |
163 | ||
7f646e92 FF |
164 | /* Allocate a single Generic IRQ chip for this node */ |
165 | ret = irq_alloc_domain_generic_chips(data->domain, 32, 1, | |
1abbdbac | 166 | np->full_name, handle_edge_irq, clr, 0, flags); |
7f646e92 FF |
167 | if (ret) { |
168 | pr_err("failed to allocate generic irq chip\n"); | |
169 | goto out_free_domain; | |
170 | } | |
171 | ||
172 | /* Set the IRQ chaining logic */ | |
f286c173 TG |
173 | irq_set_chained_handler_and_data(data->parent_irq, |
174 | brcmstb_l2_intc_irq_handle, data); | |
7f646e92 FF |
175 | |
176 | gc = irq_get_domain_generic_chip(data->domain, 0); | |
177 | gc->reg_base = data->base; | |
178 | gc->private = data; | |
179 | ct = gc->chip_types; | |
180 | ||
181 | ct->chip.irq_ack = irq_gc_ack_set_bit; | |
182 | ct->regs.ack = CPU_CLEAR; | |
183 | ||
184 | ct->chip.irq_mask = irq_gc_mask_disable_reg; | |
185 | ct->regs.disable = CPU_MASK_SET; | |
186 | ||
187 | ct->chip.irq_unmask = irq_gc_unmask_enable_reg; | |
188 | ct->regs.enable = CPU_MASK_CLEAR; | |
189 | ||
190 | ct->chip.irq_suspend = brcmstb_l2_intc_suspend; | |
191 | ct->chip.irq_resume = brcmstb_l2_intc_resume; | |
c017d211 | 192 | ct->chip.irq_pm_shutdown = brcmstb_l2_intc_suspend; |
7f646e92 | 193 | |
c9ae71e0 | 194 | if (data->can_wake) { |
7f646e92 FF |
195 | /* This IRQ chip can wake the system, set all child interrupts |
196 | * in wake_enabled mask | |
197 | */ | |
198 | gc->wake_enabled = 0xffffffff; | |
199 | ct->chip.irq_set_wake = irq_gc_set_wake; | |
200 | } | |
201 | ||
202 | pr_info("registered L2 intc (mem: 0x%p, parent irq: %d)\n", | |
203 | data->base, data->parent_irq); | |
204 | ||
205 | return 0; | |
206 | ||
207 | out_free_domain: | |
208 | irq_domain_remove(data->domain); | |
209 | out_unmap: | |
210 | iounmap(data->base); | |
211 | out_free: | |
212 | kfree(data); | |
213 | return ret; | |
214 | } | |
215 | IRQCHIP_DECLARE(brcmstb_l2_intc, "brcm,l2-intc", brcmstb_l2_intc_of_init); |