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
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/*
* Copyright (C) 2016 Marvell
*
* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
*
* 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.
*/
#define pr_fmt(fmt) "GIC-ODMI: " fmt
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/msi.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include "irq-msi-lib.h"
#include <dt-bindings/interrupt-controller/arm-gic.h>
#define GICP_ODMIN_SET 0x40
#define GICP_ODMI_INT_NUM_SHIFT 12
#define GICP_ODMIN_GM_EP_R0 0x110
#define GICP_ODMIN_GM_EP_R1 0x114
#define GICP_ODMIN_GM_EA_R0 0x108
#define GICP_ODMIN_GM_EA_R1 0x118
/*
* We don't support the group events, so we simply have 8 interrupts
* per frame.
*/
#define NODMIS_SHIFT 3
#define NODMIS_PER_FRAME (1 << NODMIS_SHIFT)
#define NODMIS_MASK (NODMIS_PER_FRAME - 1)
struct odmi_data {
struct resource res;
void __iomem *base;
unsigned int spi_base;
};
static struct odmi_data *odmis;
static unsigned long *odmis_bm;
static unsigned int odmis_count;
/* Protects odmis_bm */
static DEFINE_SPINLOCK(odmis_bm_lock);
static void odmi_compose_msi_msg(struct irq_data *d, struct msi_msg *msg)
{
struct odmi_data *odmi;
phys_addr_t addr;
unsigned int odmin;
if (WARN_ON(d->hwirq >= odmis_count * NODMIS_PER_FRAME))
return;
odmi = &odmis[d->hwirq >> NODMIS_SHIFT];
odmin = d->hwirq & NODMIS_MASK;
addr = odmi->res.start + GICP_ODMIN_SET;
msg->address_hi = upper_32_bits(addr);
msg->address_lo = lower_32_bits(addr);
msg->data = odmin << GICP_ODMI_INT_NUM_SHIFT;
}
static struct irq_chip odmi_irq_chip = {
.name = "ODMI",
.irq_mask = irq_chip_mask_parent,
.irq_unmask = irq_chip_unmask_parent,
.irq_eoi = irq_chip_eoi_parent,
.irq_set_affinity = irq_chip_set_affinity_parent,
.irq_compose_msi_msg = odmi_compose_msi_msg,
};
static int odmi_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *args)
{
struct odmi_data *odmi = NULL;
struct irq_fwspec fwspec;
struct irq_data *d;
unsigned int hwirq, odmin;
int ret;
spin_lock(&odmis_bm_lock);
hwirq = find_first_zero_bit(odmis_bm, NODMIS_PER_FRAME * odmis_count);
if (hwirq >= NODMIS_PER_FRAME * odmis_count) {
spin_unlock(&odmis_bm_lock);
return -ENOSPC;
}
__set_bit(hwirq, odmis_bm);
spin_unlock(&odmis_bm_lock);
odmi = &odmis[hwirq >> NODMIS_SHIFT];
odmin = hwirq & NODMIS_MASK;
fwspec.fwnode = domain->parent->fwnode;
fwspec.param_count = 3;
fwspec.param[0] = GIC_SPI;
fwspec.param[1] = odmi->spi_base - 32 + odmin;
fwspec.param[2] = IRQ_TYPE_EDGE_RISING;
ret = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
if (ret) {
pr_err("Cannot allocate parent IRQ\n");
spin_lock(&odmis_bm_lock);
__clear_bit(odmin, odmis_bm);
spin_unlock(&odmis_bm_lock);
return ret;
}
/* Configure the interrupt line to be edge */
d = irq_domain_get_irq_data(domain->parent, virq);
d->chip->irq_set_type(d, IRQ_TYPE_EDGE_RISING);
irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
&odmi_irq_chip, NULL);
return 0;
}
static void odmi_irq_domain_free(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs)
{
struct irq_data *d = irq_domain_get_irq_data(domain, virq);
if (d->hwirq >= odmis_count * NODMIS_PER_FRAME) {
pr_err("Failed to teardown msi. Invalid hwirq %lu\n", d->hwirq);
return;
}
irq_domain_free_irqs_parent(domain, virq, nr_irqs);
/* Actually free the MSI */
spin_lock(&odmis_bm_lock);
__clear_bit(d->hwirq, odmis_bm);
spin_unlock(&odmis_bm_lock);
}
static const struct irq_domain_ops odmi_domain_ops = {
.select = msi_lib_irq_domain_select,
.alloc = odmi_irq_domain_alloc,
.free = odmi_irq_domain_free,
};
#define ODMI_MSI_FLAGS_REQUIRED (MSI_FLAG_USE_DEF_DOM_OPS | \
MSI_FLAG_USE_DEF_CHIP_OPS)
#define ODMI_MSI_FLAGS_SUPPORTED (MSI_GENERIC_FLAGS_MASK)
static const struct msi_parent_ops odmi_msi_parent_ops = {
.supported_flags = ODMI_MSI_FLAGS_SUPPORTED,
.required_flags = ODMI_MSI_FLAGS_REQUIRED,
.bus_select_token = DOMAIN_BUS_GENERIC_MSI,
.bus_select_mask = MATCH_PLATFORM_MSI,
.prefix = "ODMI-",
.init_dev_msi_info = msi_lib_init_dev_msi_info,
};
static int __init mvebu_odmi_init(struct device_node *node,
struct device_node *parent)
{
struct irq_domain *parent_domain, *inner_domain;
int ret, i;
if (of_property_read_u32(node, "marvell,odmi-frames", &odmis_count))
return -EINVAL;
odmis = kcalloc(odmis_count, sizeof(struct odmi_data), GFP_KERNEL);
if (!odmis)
return -ENOMEM;
odmis_bm = bitmap_zalloc(odmis_count * NODMIS_PER_FRAME, GFP_KERNEL);
if (!odmis_bm) {
ret = -ENOMEM;
goto err_alloc;
}
for (i = 0; i < odmis_count; i++) {
struct odmi_data *odmi = &odmis[i];
ret = of_address_to_resource(node, i, &odmi->res);
if (ret)
goto err_unmap;
odmi->base = of_io_request_and_map(node, i, "odmi");
if (IS_ERR(odmi->base)) {
ret = PTR_ERR(odmi->base);
goto err_unmap;
}
if (of_property_read_u32_index(node, "marvell,spi-base",
i, &odmi->spi_base)) {
ret = -EINVAL;
goto err_unmap;
}
}
parent_domain = irq_find_host(parent);
inner_domain = irq_domain_create_hierarchy(parent_domain, 0,
odmis_count * NODMIS_PER_FRAME,
of_node_to_fwnode(node),
&odmi_domain_ops, NULL);
if (!inner_domain) {
ret = -ENOMEM;
goto err_unmap;
}
irq_domain_update_bus_token(inner_domain, DOMAIN_BUS_GENERIC_MSI);
inner_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT;
inner_domain->msi_parent_ops = &odmi_msi_parent_ops;
return 0;
err_unmap:
for (i = 0; i < odmis_count; i++) {
struct odmi_data *odmi = &odmis[i];
if (odmi->base && !IS_ERR(odmi->base))
iounmap(odmis[i].base);
}
bitmap_free(odmis_bm);
err_alloc:
kfree(odmis);
return ret;
}
IRQCHIP_DECLARE(mvebu_odmi, "marvell,odmi-controller", mvebu_odmi_init);
|
