1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/*
* Synopsys DW APB ICTL irqchip driver.
*
* Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
*
* based on GPL'ed 2.6 kernel sources
* (c) Marvell International Ltd.
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/interrupt.h>
#define APB_INT_ENABLE_L 0x00
#define APB_INT_ENABLE_H 0x04
#define APB_INT_MASK_L 0x08
#define APB_INT_MASK_H 0x0c
#define APB_INT_FINALSTATUS_L 0x30
#define APB_INT_FINALSTATUS_H 0x34
#define APB_INT_BASE_OFFSET 0x04
/* irq domain of the primary interrupt controller. */
static struct irq_domain *dw_apb_ictl_irq_domain;
static void __irq_entry dw_apb_ictl_handle_irq(struct pt_regs *regs)
{
struct irq_domain *d = dw_apb_ictl_irq_domain;
int n;
for (n = 0; n < d->revmap_size; n += 32) {
struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, n);
u32 stat = readl_relaxed(gc->reg_base + APB_INT_FINALSTATUS_L);
while (stat) {
u32 hwirq = ffs(stat) - 1;
handle_domain_irq(d, hwirq, regs);
stat &= ~BIT(hwirq);
}
}
}
static void dw_apb_ictl_handle_irq_cascaded(struct irq_desc *desc)
{
struct irq_domain *d = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
int n;
chained_irq_enter(chip, desc);
for (n = 0; n < d->revmap_size; n += 32) {
struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, n);
u32 stat = readl_relaxed(gc->reg_base + APB_INT_FINALSTATUS_L);
while (stat) {
u32 hwirq = ffs(stat) - 1;
generic_handle_domain_irq(d, gc->irq_base + hwirq);
stat &= ~BIT(hwirq);
}
}
chained_irq_exit(chip, desc);
}
static int dw_apb_ictl_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
int i, ret;
irq_hw_number_t hwirq;
unsigned int type = IRQ_TYPE_NONE;
struct irq_fwspec *fwspec = arg;
ret = irq_domain_translate_onecell(domain, fwspec, &hwirq, &type);
if (ret)
return ret;
for (i = 0; i < nr_irqs; i++)
irq_map_generic_chip(domain, virq + i, hwirq + i);
return 0;
}
static const struct irq_domain_ops dw_apb_ictl_irq_domain_ops = {
.translate = irq_domain_translate_onecell,
.alloc = dw_apb_ictl_irq_domain_alloc,
.free = irq_domain_free_irqs_top,
};
#ifdef CONFIG_PM
static void dw_apb_ictl_resume(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
irq_gc_lock(gc);
writel_relaxed(~0, gc->reg_base + ct->regs.enable);
writel_relaxed(*ct->mask_cache, gc->reg_base + ct->regs.mask);
irq_gc_unlock(gc);
}
#else
#define dw_apb_ictl_resume NULL
#endif /* CONFIG_PM */
static int __init dw_apb_ictl_init(struct device_node *np,
struct device_node *parent)
{
const struct irq_domain_ops *domain_ops;
unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
struct resource r;
struct irq_domain *domain;
struct irq_chip_generic *gc;
void __iomem *iobase;
int ret, nrirqs, parent_irq, i;
u32 reg;
if (!parent) {
/* Used as the primary interrupt controller */
parent_irq = 0;
domain_ops = &dw_apb_ictl_irq_domain_ops;
} else {
/* Map the parent interrupt for the chained handler */
parent_irq = irq_of_parse_and_map(np, 0);
if (parent_irq <= 0) {
pr_err("%pOF: unable to parse irq\n", np);
return -EINVAL;
}
domain_ops = &irq_generic_chip_ops;
}
ret = of_address_to_resource(np, 0, &r);
if (ret) {
pr_err("%pOF: unable to get resource\n", np);
return ret;
}
if (!request_mem_region(r.start, resource_size(&r), np->full_name)) {
pr_err("%pOF: unable to request mem region\n", np);
return -ENOMEM;
}
iobase = ioremap(r.start, resource_size(&r));
if (!iobase) {
pr_err("%pOF: unable to map resource\n", np);
ret = -ENOMEM;
goto err_release;
}
/*
* DW IP can be configured to allow 2-64 irqs. We can determine
* the number of irqs supported by writing into enable register
* and look for bits not set, as corresponding flip-flops will
* have been removed by synthesis tool.
*/
/* mask and enable all interrupts */
writel_relaxed(~0, iobase + APB_INT_MASK_L);
writel_relaxed(~0, iobase + APB_INT_MASK_H);
writel_relaxed(~0, iobase + APB_INT_ENABLE_L);
writel_relaxed(~0, iobase + APB_INT_ENABLE_H);
reg = readl_relaxed(iobase + APB_INT_ENABLE_H);
if (reg)
nrirqs = 32 + fls(reg);
else
nrirqs = fls(readl_relaxed(iobase + APB_INT_ENABLE_L));
domain = irq_domain_add_linear(np, nrirqs, domain_ops, NULL);
if (!domain) {
pr_err("%pOF: unable to add irq domain\n", np);
ret = -ENOMEM;
goto err_unmap;
}
ret = irq_alloc_domain_generic_chips(domain, 32, 1, np->name,
handle_level_irq, clr, 0,
IRQ_GC_INIT_MASK_CACHE);
if (ret) {
pr_err("%pOF: unable to alloc irq domain gc\n", np);
goto err_unmap;
}
for (i = 0; i < DIV_ROUND_UP(nrirqs, 32); i++) {
gc = irq_get_domain_generic_chip(domain, i * 32);
gc->reg_base = iobase + i * APB_INT_BASE_OFFSET;
gc->chip_types[0].regs.mask = APB_INT_MASK_L;
gc->chip_types[0].regs.enable = APB_INT_ENABLE_L;
gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit;
gc->chip_types[0].chip.irq_unmask = irq_gc_mask_clr_bit;
gc->chip_types[0].chip.irq_resume = dw_apb_ictl_resume;
}
if (parent_irq) {
irq_set_chained_handler_and_data(parent_irq,
dw_apb_ictl_handle_irq_cascaded, domain);
} else {
dw_apb_ictl_irq_domain = domain;
set_handle_irq(dw_apb_ictl_handle_irq);
}
return 0;
err_unmap:
iounmap(iobase);
err_release:
release_mem_region(r.start, resource_size(&r));
return ret;
}
IRQCHIP_DECLARE(dw_apb_ictl,
"snps,dw-apb-ictl", dw_apb_ictl_init);
|
