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
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* A64FX diag driver.
* Copyright (c) 2022 Fujitsu Ltd.
*/
#include <linux/acpi.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#define A64FX_DIAG_IRQ 1
#define BMC_DIAG_INTERRUPT_ENABLE 0x40
#define BMC_DIAG_INTERRUPT_STATUS 0x44
#define BMC_DIAG_INTERRUPT_MASK BIT(31)
struct a64fx_diag_priv {
void __iomem *mmsc_reg_base;
int irq;
bool has_nmi;
};
static irqreturn_t a64fx_diag_handler_nmi(int irq, void *dev_id)
{
nmi_panic(NULL, "a64fx_diag: interrupt received\n");
return IRQ_HANDLED;
}
static irqreturn_t a64fx_diag_handler_irq(int irq, void *dev_id)
{
panic("a64fx_diag: interrupt received\n");
return IRQ_HANDLED;
}
static void a64fx_diag_interrupt_clear(struct a64fx_diag_priv *priv)
{
void __iomem *diag_status_reg_addr;
u32 mmsc;
diag_status_reg_addr = priv->mmsc_reg_base + BMC_DIAG_INTERRUPT_STATUS;
mmsc = readl(diag_status_reg_addr);
if (mmsc & BMC_DIAG_INTERRUPT_MASK)
writel(BMC_DIAG_INTERRUPT_MASK, diag_status_reg_addr);
}
static void a64fx_diag_interrupt_enable(struct a64fx_diag_priv *priv)
{
void __iomem *diag_enable_reg_addr;
u32 mmsc;
diag_enable_reg_addr = priv->mmsc_reg_base + BMC_DIAG_INTERRUPT_ENABLE;
mmsc = readl(diag_enable_reg_addr);
if (!(mmsc & BMC_DIAG_INTERRUPT_MASK)) {
mmsc |= BMC_DIAG_INTERRUPT_MASK;
writel(mmsc, diag_enable_reg_addr);
}
}
static void a64fx_diag_interrupt_disable(struct a64fx_diag_priv *priv)
{
void __iomem *diag_enable_reg_addr;
u32 mmsc;
diag_enable_reg_addr = priv->mmsc_reg_base + BMC_DIAG_INTERRUPT_ENABLE;
mmsc = readl(diag_enable_reg_addr);
if (mmsc & BMC_DIAG_INTERRUPT_MASK) {
mmsc &= ~BMC_DIAG_INTERRUPT_MASK;
writel(mmsc, diag_enable_reg_addr);
}
}
static int a64fx_diag_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct a64fx_diag_priv *priv;
unsigned long irq_flags;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (priv == NULL)
return -ENOMEM;
priv->mmsc_reg_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->mmsc_reg_base))
return PTR_ERR(priv->mmsc_reg_base);
priv->irq = platform_get_irq(pdev, A64FX_DIAG_IRQ);
if (priv->irq < 0)
return priv->irq;
platform_set_drvdata(pdev, priv);
irq_flags = IRQF_PERCPU | IRQF_NOBALANCING | IRQF_NO_AUTOEN |
IRQF_NO_THREAD;
ret = request_nmi(priv->irq, &a64fx_diag_handler_nmi, irq_flags,
"a64fx_diag_nmi", NULL);
if (ret) {
ret = request_irq(priv->irq, &a64fx_diag_handler_irq,
irq_flags, "a64fx_diag_irq", NULL);
if (ret) {
dev_err(dev, "cannot register IRQ %d\n", ret);
return ret;
}
enable_irq(priv->irq);
} else {
enable_nmi(priv->irq);
priv->has_nmi = true;
}
a64fx_diag_interrupt_clear(priv);
a64fx_diag_interrupt_enable(priv);
return 0;
}
static int a64fx_diag_remove(struct platform_device *pdev)
{
struct a64fx_diag_priv *priv = platform_get_drvdata(pdev);
a64fx_diag_interrupt_disable(priv);
a64fx_diag_interrupt_clear(priv);
if (priv->has_nmi)
free_nmi(priv->irq, NULL);
else
free_irq(priv->irq, NULL);
return 0;
}
static const struct acpi_device_id a64fx_diag_acpi_match[] = {
{ "FUJI2007", 0 },
{ },
};
MODULE_DEVICE_TABLE(acpi, a64fx_diag_acpi_match);
static struct platform_driver a64fx_diag_driver = {
.driver = {
.name = "a64fx_diag_driver",
.acpi_match_table = ACPI_PTR(a64fx_diag_acpi_match),
},
.probe = a64fx_diag_probe,
.remove = a64fx_diag_remove,
};
module_platform_driver(a64fx_diag_driver);
MODULE_AUTHOR("Hitomi Hasegawa <hasegawa-hitomi@fujitsu.com>");
MODULE_DESCRIPTION("A64FX diag driver");
|
