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1/*
2 * Copyright (C) 2014 Mans Rullgard <mans@mansr.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
8 */
9
10#include <linux/init.h>
11#include <linux/irq.h>
12#include <linux/irqchip.h>
13#include <linux/irqchip/chained_irq.h>
14#include <linux/ioport.h>
15#include <linux/io.h>
16#include <linux/of_address.h>
17#include <linux/of_irq.h>
18#include <linux/slab.h>
19
20#define IRQ0_CTL_BASE 0x0000
21#define IRQ1_CTL_BASE 0x0100
22#define EDGE_CTL_BASE 0x0200
23#define IRQ2_CTL_BASE 0x0300
24
25#define IRQ_CTL_HI 0x18
26#define EDGE_CTL_HI 0x20
27
28#define IRQ_STATUS 0x00
29#define IRQ_RAWSTAT 0x04
30#define IRQ_EN_SET 0x08
31#define IRQ_EN_CLR 0x0c
32#define IRQ_SOFT_SET 0x10
33#define IRQ_SOFT_CLR 0x14
34
35#define EDGE_STATUS 0x00
36#define EDGE_RAWSTAT 0x04
37#define EDGE_CFG_RISE 0x08
38#define EDGE_CFG_FALL 0x0c
39#define EDGE_CFG_RISE_SET 0x10
40#define EDGE_CFG_RISE_CLR 0x14
41#define EDGE_CFG_FALL_SET 0x18
42#define EDGE_CFG_FALL_CLR 0x1c
43
44struct tangox_irq_chip {
45 void __iomem *base;
46 unsigned long ctl;
47};
48
49static inline u32 intc_readl(struct tangox_irq_chip *chip, int reg)
50{
51 return readl_relaxed(chip->base + reg);
52}
53
54static inline void intc_writel(struct tangox_irq_chip *chip, int reg, u32 val)
55{
56 writel_relaxed(val, chip->base + reg);
57}
58
59static void tangox_dispatch_irqs(struct irq_domain *dom, unsigned int status,
60 int base)
61{
62 unsigned int hwirq;
63 unsigned int virq;
64
65 while (status) {
66 hwirq = __ffs(status);
67 virq = irq_find_mapping(dom, base + hwirq);
68 if (virq)
69 generic_handle_irq(virq);
70 status &= ~BIT(hwirq);
71 }
72}
73
74static void tangox_irq_handler(struct irq_desc *desc)
75{
76 struct irq_domain *dom = irq_desc_get_handler_data(desc);
77 struct irq_chip *host_chip = irq_desc_get_chip(desc);
78 struct tangox_irq_chip *chip = dom->host_data;
79 unsigned int status_lo, status_hi;
80
81 chained_irq_enter(host_chip, desc);
82
83 status_lo = intc_readl(chip, chip->ctl + IRQ_STATUS);
84 status_hi = intc_readl(chip, chip->ctl + IRQ_CTL_HI + IRQ_STATUS);
85
86 tangox_dispatch_irqs(dom, status_lo, 0);
87 tangox_dispatch_irqs(dom, status_hi, 32);
88
89 chained_irq_exit(host_chip, desc);
90}
91
92static int tangox_irq_set_type(struct irq_data *d, unsigned int flow_type)
93{
94 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
95 struct tangox_irq_chip *chip = gc->domain->host_data;
96 struct irq_chip_regs *regs = &gc->chip_types[0].regs;
97
98 switch (flow_type & IRQ_TYPE_SENSE_MASK) {
99 case IRQ_TYPE_EDGE_RISING:
100 intc_writel(chip, regs->type + EDGE_CFG_RISE_SET, d->mask);
101 intc_writel(chip, regs->type + EDGE_CFG_FALL_CLR, d->mask);
102 break;
103
104 case IRQ_TYPE_EDGE_FALLING:
105 intc_writel(chip, regs->type + EDGE_CFG_RISE_CLR, d->mask);
106 intc_writel(chip, regs->type + EDGE_CFG_FALL_SET, d->mask);
107 break;
108
109 case IRQ_TYPE_LEVEL_HIGH:
110 intc_writel(chip, regs->type + EDGE_CFG_RISE_CLR, d->mask);
111 intc_writel(chip, regs->type + EDGE_CFG_FALL_CLR, d->mask);
112 break;
113
114 case IRQ_TYPE_LEVEL_LOW:
115 intc_writel(chip, regs->type + EDGE_CFG_RISE_SET, d->mask);
116 intc_writel(chip, regs->type + EDGE_CFG_FALL_SET, d->mask);
117 break;
118
119 default:
120 pr_err("Invalid trigger mode %x for IRQ %d\n",
121 flow_type, d->irq);
122 return -EINVAL;
123 }
124
125 return irq_setup_alt_chip(d, flow_type);
126}
127
128static void __init tangox_irq_init_chip(struct irq_chip_generic *gc,
129 unsigned long ctl_offs,
130 unsigned long edge_offs)
131{
132 struct tangox_irq_chip *chip = gc->domain->host_data;
133 struct irq_chip_type *ct = gc->chip_types;
134 unsigned long ctl_base = chip->ctl + ctl_offs;
135 unsigned long edge_base = EDGE_CTL_BASE + edge_offs;
136 int i;
137
138 gc->reg_base = chip->base;
139 gc->unused = 0;
140
141 for (i = 0; i < 2; i++) {
142 ct[i].chip.irq_ack = irq_gc_ack_set_bit;
143 ct[i].chip.irq_mask = irq_gc_mask_disable_reg;
144 ct[i].chip.irq_mask_ack = irq_gc_mask_disable_reg_and_ack;
145 ct[i].chip.irq_unmask = irq_gc_unmask_enable_reg;
146 ct[i].chip.irq_set_type = tangox_irq_set_type;
147 ct[i].chip.name = gc->domain->name;
148
149 ct[i].regs.enable = ctl_base + IRQ_EN_SET;
150 ct[i].regs.disable = ctl_base + IRQ_EN_CLR;
151 ct[i].regs.ack = edge_base + EDGE_RAWSTAT;
152 ct[i].regs.type = edge_base;
153 }
154
155 ct[0].type = IRQ_TYPE_LEVEL_MASK;
156 ct[0].handler = handle_level_irq;
157
158 ct[1].type = IRQ_TYPE_EDGE_BOTH;
159 ct[1].handler = handle_edge_irq;
160
161 intc_writel(chip, ct->regs.disable, 0xffffffff);
162 intc_writel(chip, ct->regs.ack, 0xffffffff);
163}
164
165static void __init tangox_irq_domain_init(struct irq_domain *dom)
166{
167 struct irq_chip_generic *gc;
168 int i;
169
170 for (i = 0; i < 2; i++) {
171 gc = irq_get_domain_generic_chip(dom, i * 32);
172 tangox_irq_init_chip(gc, i * IRQ_CTL_HI, i * EDGE_CTL_HI);
173 }
174}
175
176static int __init tangox_irq_init(void __iomem *base, struct resource *baseres,
177 struct device_node *node)
178{
179 struct tangox_irq_chip *chip;
180 struct irq_domain *dom;
181 struct resource res;
182 int irq;
183 int err;
184
185 irq = irq_of_parse_and_map(node, 0);
186 if (!irq)
187 panic("%s: failed to get IRQ", node->name);
188
189 err = of_address_to_resource(node, 0, &res);
190 if (err)
191 panic("%s: failed to get address", node->name);
192
193 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
194 chip->ctl = res.start - baseres->start;
195 chip->base = base;
196
197 dom = irq_domain_add_linear(node, 64, &irq_generic_chip_ops, chip);
198 if (!dom)
199 panic("%s: failed to create irqdomain", node->name);
200
201 err = irq_alloc_domain_generic_chips(dom, 32, 2, node->name,
202 handle_level_irq, 0, 0, 0);
203 if (err)
204 panic("%s: failed to allocate irqchip", node->name);
205
206 tangox_irq_domain_init(dom);
207
208 irq_set_chained_handler(irq, tangox_irq_handler);
209 irq_set_handler_data(irq, dom);
210
211 return 0;
212}
213
214static int __init tangox_of_irq_init(struct device_node *node,
215 struct device_node *parent)
216{
217 struct device_node *c;
218 struct resource res;
219 void __iomem *base;
220
221 base = of_iomap(node, 0);
222 if (!base)
223 panic("%s: of_iomap failed", node->name);
224
225 of_address_to_resource(node, 0, &res);
226
227 for_each_child_of_node(node, c)
228 tangox_irq_init(base, &res, c);
229
230 return 0;
231}
232IRQCHIP_DECLARE(tangox_intc, "sigma,smp8642-intc", tangox_of_irq_init);