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1/*
2 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
3 * Copyright (C) 2014 Stefan Kristansson <stefan.kristiansson@saunalahti.fi>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any later version.
9 */
10
11#include <linux/irq.h>
12#include <linux/irqchip.h>
13#include <linux/of.h>
14#include <linux/of_irq.h>
15#include <linux/of_address.h>
16
17/* OR1K PIC implementation */
18
19struct or1k_pic_dev {
20 struct irq_chip chip;
21 irq_flow_handler_t handle;
22 unsigned long flags;
23};
24
25/*
26 * We're a couple of cycles faster than the generic implementations with
27 * these 'fast' versions.
28 */
29
30static void or1k_pic_mask(struct irq_data *data)
31{
32 mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1UL << data->hwirq));
33}
34
35static void or1k_pic_unmask(struct irq_data *data)
36{
37 mtspr(SPR_PICMR, mfspr(SPR_PICMR) | (1UL << data->hwirq));
38}
39
40static void or1k_pic_ack(struct irq_data *data)
41{
42 mtspr(SPR_PICSR, (1UL << data->hwirq));
43}
44
45static void or1k_pic_mask_ack(struct irq_data *data)
46{
47 mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1UL << data->hwirq));
48 mtspr(SPR_PICSR, (1UL << data->hwirq));
49}
50
51/*
52 * There are two oddities with the OR1200 PIC implementation:
53 * i) LEVEL-triggered interrupts are latched and need to be cleared
54 * ii) the interrupt latch is cleared by writing a 0 to the bit,
55 * as opposed to a 1 as mandated by the spec
56 */
57static void or1k_pic_or1200_ack(struct irq_data *data)
58{
59 mtspr(SPR_PICSR, mfspr(SPR_PICSR) & ~(1UL << data->hwirq));
60}
61
62static void or1k_pic_or1200_mask_ack(struct irq_data *data)
63{
64 mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1UL << data->hwirq));
65 mtspr(SPR_PICSR, mfspr(SPR_PICSR) & ~(1UL << data->hwirq));
66}
67
68static struct or1k_pic_dev or1k_pic_level = {
69 .chip = {
70 .name = "or1k-PIC-level",
71 .irq_unmask = or1k_pic_unmask,
72 .irq_mask = or1k_pic_mask,
73 .irq_mask_ack = or1k_pic_mask_ack,
74 },
75 .handle = handle_level_irq,
76 .flags = IRQ_LEVEL | IRQ_NOPROBE,
77};
78
79static struct or1k_pic_dev or1k_pic_edge = {
80 .chip = {
81 .name = "or1k-PIC-edge",
82 .irq_unmask = or1k_pic_unmask,
83 .irq_mask = or1k_pic_mask,
84 .irq_ack = or1k_pic_ack,
85 .irq_mask_ack = or1k_pic_mask_ack,
86 },
87 .handle = handle_edge_irq,
88 .flags = IRQ_LEVEL | IRQ_NOPROBE,
89};
90
91static struct or1k_pic_dev or1k_pic_or1200 = {
92 .chip = {
93 .name = "or1200-PIC",
94 .irq_unmask = or1k_pic_unmask,
95 .irq_mask = or1k_pic_mask,
96 .irq_ack = or1k_pic_or1200_ack,
97 .irq_mask_ack = or1k_pic_or1200_mask_ack,
98 },
99 .handle = handle_level_irq,
100 .flags = IRQ_LEVEL | IRQ_NOPROBE,
101};
102
103static struct irq_domain *root_domain;
104
105static inline int pic_get_irq(int first)
106{
107 int hwirq;
108
109 hwirq = ffs(mfspr(SPR_PICSR) >> first);
110 if (!hwirq)
111 return NO_IRQ;
112 else
113 hwirq = hwirq + first - 1;
114
115 return hwirq;
116}
117
118static void or1k_pic_handle_irq(struct pt_regs *regs)
119{
120 int irq = -1;
121
122 while ((irq = pic_get_irq(irq + 1)) != NO_IRQ)
123 handle_domain_irq(root_domain, irq, regs);
124}
125
126static int or1k_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
127{
128 struct or1k_pic_dev *pic = d->host_data;
129
130 irq_set_chip_and_handler(irq, &pic->chip, pic->handle);
131 irq_set_status_flags(irq, pic->flags);
132
133 return 0;
134}
135
136static const struct irq_domain_ops or1k_irq_domain_ops = {
137 .xlate = irq_domain_xlate_onecell,
138 .map = or1k_map,
139};
140
141/*
142 * This sets up the IRQ domain for the PIC built in to the OpenRISC
143 * 1000 CPU. This is the "root" domain as these are the interrupts
144 * that directly trigger an exception in the CPU.
145 */
146static int __init or1k_pic_init(struct device_node *node,
147 struct or1k_pic_dev *pic)
148{
149 /* Disable all interrupts until explicitly requested */
150 mtspr(SPR_PICMR, (0UL));
151
152 root_domain = irq_domain_add_linear(node, 32, &or1k_irq_domain_ops,
153 pic);
154
155 set_handle_irq(or1k_pic_handle_irq);
156
157 return 0;
158}
159
160static int __init or1k_pic_or1200_init(struct device_node *node,
161 struct device_node *parent)
162{
163 return or1k_pic_init(node, &or1k_pic_or1200);
164}
165IRQCHIP_DECLARE(or1k_pic_or1200, "opencores,or1200-pic", or1k_pic_or1200_init);
166IRQCHIP_DECLARE(or1k_pic, "opencores,or1k-pic", or1k_pic_or1200_init);
167
168static int __init or1k_pic_level_init(struct device_node *node,
169 struct device_node *parent)
170{
171 return or1k_pic_init(node, &or1k_pic_level);
172}
173IRQCHIP_DECLARE(or1k_pic_level, "opencores,or1k-pic-level",
174 or1k_pic_level_init);
175
176static int __init or1k_pic_edge_init(struct device_node *node,
177 struct device_node *parent)
178{
179 return or1k_pic_init(node, &or1k_pic_edge);
180}
181IRQCHIP_DECLARE(or1k_pic_edge, "opencores,or1k-pic-edge", or1k_pic_edge_init);
182

Warning: That file was not part of the compilation database. It may have many parsing errors.