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
|
/*
* Copyright (c) 2002-2003 Matthew Wilcox for Hewlett-Packard
* Copyright (C) 2004 Hewlett-Packard Co
* Bjorn Helgaas <bjorn.helgaas@hp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/serial_core.h>
#include <acpi/acpi_bus.h>
#include <asm/io.h>
#include "8250.h"
struct serial_private {
int line;
};
static acpi_status acpi_serial_mmio(struct uart_port *port,
struct acpi_resource_address64 *addr)
{
port->mapbase = addr->min_address_range;
port->iotype = UPIO_MEM;
port->flags |= UPF_IOREMAP;
return AE_OK;
}
static acpi_status acpi_serial_port(struct uart_port *port,
struct acpi_resource_io *io)
{
if (io->range_length) {
port->iobase = io->min_base_address;
port->iotype = UPIO_PORT;
} else
printk(KERN_ERR "%s: zero-length IO port range?\n", __FUNCTION__);
return AE_OK;
}
static acpi_status acpi_serial_ext_irq(struct uart_port *port,
struct acpi_resource_ext_irq *ext_irq)
{
int rc;
if (ext_irq->number_of_interrupts > 0) {
rc = acpi_register_gsi(ext_irq->interrupts[0],
ext_irq->edge_level, ext_irq->active_high_low);
if (rc < 0)
return AE_ERROR;
port->irq = rc;
}
return AE_OK;
}
static acpi_status acpi_serial_irq(struct uart_port *port,
struct acpi_resource_irq *irq)
{
int rc;
if (irq->number_of_interrupts > 0) {
rc = acpi_register_gsi(irq->interrupts[0],
irq->edge_level, irq->active_high_low);
if (rc < 0)
return AE_ERROR;
port->irq = rc;
}
return AE_OK;
}
static acpi_status acpi_serial_resource(struct acpi_resource *res, void *data)
{
struct uart_port *port = (struct uart_port *) data;
struct acpi_resource_address64 addr;
acpi_status status;
status = acpi_resource_to_address64(res, &addr);
if (ACPI_SUCCESS(status))
return acpi_serial_mmio(port, &addr);
else if (res->id == ACPI_RSTYPE_IO)
return acpi_serial_port(port, &res->data.io);
else if (res->id == ACPI_RSTYPE_EXT_IRQ)
return acpi_serial_ext_irq(port, &res->data.extended_irq);
else if (res->id == ACPI_RSTYPE_IRQ)
return acpi_serial_irq(port, &res->data.irq);
return AE_OK;
}
static int acpi_serial_add(struct acpi_device *device)
{
struct serial_private *priv;
acpi_status status;
struct uart_port port;
int result;
memset(&port, 0, sizeof(struct uart_port));
port.uartclk = 1843200;
port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
priv = kmalloc(sizeof(struct serial_private), GFP_KERNEL);
if (!priv) {
result = -ENOMEM;
goto fail;
}
memset(priv, 0, sizeof(*priv));
status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
acpi_serial_resource, &port);
if (ACPI_FAILURE(status)) {
result = -ENODEV;
goto fail;
}
if (!port.mapbase && !port.iobase) {
printk(KERN_ERR "%s: no iomem or port address in %s _CRS\n",
__FUNCTION__, device->pnp.bus_id);
result = -ENODEV;
goto fail;
}
priv->line = serial8250_register_port(&port);
if (priv->line < 0) {
printk(KERN_WARNING "Couldn't register serial port %s: %d\n",
device->pnp.bus_id, priv->line);
result = -ENODEV;
goto fail;
}
acpi_driver_data(device) = priv;
return 0;
fail:
kfree(priv);
return result;
}
static int acpi_serial_remove(struct acpi_device *device, int type)
{
struct serial_private *priv;
if (!device || !acpi_driver_data(device))
return -EINVAL;
priv = acpi_driver_data(device);
serial8250_unregister_port(priv->line);
kfree(priv);
return 0;
}
static struct acpi_driver acpi_serial_driver = {
.name = "serial",
.class = "",
.ids = "PNP0501",
.ops = {
.add = acpi_serial_add,
.remove = acpi_serial_remove,
},
};
static int __init acpi_serial_init(void)
{
return acpi_bus_register_driver(&acpi_serial_driver);
}
static void __exit acpi_serial_exit(void)
{
acpi_bus_unregister_driver(&acpi_serial_driver);
}
module_init(acpi_serial_init);
module_exit(acpi_serial_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Generic 8250/16x50 ACPI serial driver");
|
