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
|
/*
* drivers/net/ethernet/ibm/emac/tah.c
*
* Driver for PowerPC 4xx on-chip ethernet controller, TAH support.
*
* Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
* <benh@kernel.crashing.org>
*
* Based on the arch/ppc version of the driver:
*
* Copyright 2004 MontaVista Software, Inc.
* Matt Porter <mporter@kernel.crashing.org>
*
* Copyright (c) 2005 Eugene Surovegin <ebs@ebshome.net>
*
* 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/of_address.h>
#include <asm/io.h>
#include "emac.h"
#include "core.h"
int tah_attach(struct platform_device *ofdev, int channel)
{
struct tah_instance *dev = platform_get_drvdata(ofdev);
mutex_lock(&dev->lock);
/* Reset has been done at probe() time... nothing else to do for now */
++dev->users;
mutex_unlock(&dev->lock);
return 0;
}
void tah_detach(struct platform_device *ofdev, int channel)
{
struct tah_instance *dev = platform_get_drvdata(ofdev);
mutex_lock(&dev->lock);
--dev->users;
mutex_unlock(&dev->lock);
}
void tah_reset(struct platform_device *ofdev)
{
struct tah_instance *dev = platform_get_drvdata(ofdev);
struct tah_regs __iomem *p = dev->base;
int n;
/* Reset TAH */
out_be32(&p->mr, TAH_MR_SR);
n = 100;
while ((in_be32(&p->mr) & TAH_MR_SR) && n)
--n;
if (unlikely(!n))
printk(KERN_ERR "%s: reset timeout\n",
ofdev->dev.of_node->full_name);
/* 10KB TAH TX FIFO accommodates the max MTU of 9000 */
out_be32(&p->mr,
TAH_MR_CVR | TAH_MR_ST_768 | TAH_MR_TFS_10KB | TAH_MR_DTFP |
TAH_MR_DIG);
}
int tah_get_regs_len(struct platform_device *ofdev)
{
return sizeof(struct emac_ethtool_regs_subhdr) +
sizeof(struct tah_regs);
}
void *tah_dump_regs(struct platform_device *ofdev, void *buf)
{
struct tah_instance *dev = platform_get_drvdata(ofdev);
struct emac_ethtool_regs_subhdr *hdr = buf;
struct tah_regs *regs = (struct tah_regs *)(hdr + 1);
hdr->version = 0;
hdr->index = 0; /* for now, are there chips with more than one
* zmii ? if yes, then we'll add a cell_index
* like we do for emac
*/
memcpy_fromio(regs, dev->base, sizeof(struct tah_regs));
return regs + 1;
}
static int tah_probe(struct platform_device *ofdev)
{
struct device_node *np = ofdev->dev.of_node;
struct tah_instance *dev;
struct resource regs;
int rc;
rc = -ENOMEM;
dev = kzalloc(sizeof(struct tah_instance), GFP_KERNEL);
if (dev == NULL)
goto err_gone;
mutex_init(&dev->lock);
dev->ofdev = ofdev;
rc = -ENXIO;
if (of_address_to_resource(np, 0, ®s)) {
printk(KERN_ERR "%s: Can't get registers address\n",
np->full_name);
goto err_free;
}
rc = -ENOMEM;
dev->base = (struct tah_regs __iomem *)ioremap(regs.start,
sizeof(struct tah_regs));
if (dev->base == NULL) {
printk(KERN_ERR "%s: Can't map device registers!\n",
np->full_name);
goto err_free;
}
platform_set_drvdata(ofdev, dev);
/* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
tah_reset(ofdev);
printk(KERN_INFO
"TAH %s initialized\n", ofdev->dev.of_node->full_name);
wmb();
return 0;
err_free:
kfree(dev);
err_gone:
return rc;
}
static int tah_remove(struct platform_device *ofdev)
{
struct tah_instance *dev = platform_get_drvdata(ofdev);
WARN_ON(dev->users != 0);
iounmap(dev->base);
kfree(dev);
return 0;
}
static struct of_device_id tah_match[] =
{
{
.compatible = "ibm,tah",
},
/* For backward compat with old DT */
{
.type = "tah",
},
{},
};
static struct platform_driver tah_driver = {
.driver = {
.name = "emac-tah",
.of_match_table = tah_match,
},
.probe = tah_probe,
.remove = tah_remove,
};
int __init tah_init(void)
{
return platform_driver_register(&tah_driver);
}
void tah_exit(void)
{
platform_driver_unregister(&tah_driver);
}
|
