Merge git://git.linux-nfs.org/pub/linux/nfs-2.6
[linux-2.6] / drivers / net / ibm_newemac / tah.c
1 /*
2  * drivers/net/ibm_newemac/tah.c
3  *
4  * Driver for PowerPC 4xx on-chip ethernet controller, TAH support.
5  *
6  * Copyright 2004 MontaVista Software, Inc.
7  * Matt Porter <mporter@kernel.crashing.org>
8  *
9  * Copyright (c) 2005 Eugene Surovegin <ebs@ebshome.net>
10  *
11  * This program is free software; you can redistribute  it and/or modify it
12  * under  the terms of  the GNU General  Public License as published by the
13  * Free Software Foundation;  either version 2 of the  License, or (at your
14  * option) any later version.
15  */
16 #include <asm/io.h>
17
18 #include "emac.h"
19 #include "core.h"
20
21 int __devinit tah_attach(struct of_device *ofdev, int channel)
22 {
23         struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
24
25         mutex_lock(&dev->lock);
26         /* Reset has been done at probe() time... nothing else to do for now */
27         ++dev->users;
28         mutex_unlock(&dev->lock);
29
30         return 0;
31 }
32
33 void __devexit tah_detach(struct of_device *ofdev, int channel)
34 {
35         struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
36
37         mutex_lock(&dev->lock);
38         --dev->users;
39         mutex_unlock(&dev->lock);
40 }
41
42 void tah_reset(struct of_device *ofdev)
43 {
44         struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
45         struct tah_regs __iomem *p = dev->base;
46         int n;
47
48         /* Reset TAH */
49         out_be32(&p->mr, TAH_MR_SR);
50         n = 100;
51         while ((in_be32(&p->mr) & TAH_MR_SR) && n)
52                 --n;
53
54         if (unlikely(!n))
55                 printk(KERN_ERR "%s: reset timeout\n", ofdev->node->full_name);
56
57         /* 10KB TAH TX FIFO accomodates the max MTU of 9000 */
58         out_be32(&p->mr,
59                  TAH_MR_CVR | TAH_MR_ST_768 | TAH_MR_TFS_10KB | TAH_MR_DTFP |
60                  TAH_MR_DIG);
61 }
62
63 int tah_get_regs_len(struct of_device *ofdev)
64 {
65         return sizeof(struct emac_ethtool_regs_subhdr) +
66                 sizeof(struct tah_regs);
67 }
68
69 void *tah_dump_regs(struct of_device *ofdev, void *buf)
70 {
71         struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
72         struct emac_ethtool_regs_subhdr *hdr = buf;
73         struct tah_regs *regs = (struct tah_regs *)(hdr + 1);
74
75         hdr->version = 0;
76         hdr->index = 0; /* for now, are there chips with more than one
77                          * zmii ? if yes, then we'll add a cell_index
78                          * like we do for emac
79                          */
80         memcpy_fromio(regs, dev->base, sizeof(struct tah_regs));
81         return regs + 1;
82 }
83
84 static int __devinit tah_probe(struct of_device *ofdev,
85                                const struct of_device_id *match)
86 {
87         struct device_node *np = ofdev->node;
88         struct tah_instance *dev;
89         struct resource regs;
90         int rc;
91
92         rc = -ENOMEM;
93         dev = kzalloc(sizeof(struct tah_instance), GFP_KERNEL);
94         if (dev == NULL) {
95                 printk(KERN_ERR "%s: could not allocate TAH device!\n",
96                        np->full_name);
97                 goto err_gone;
98         }
99
100         mutex_init(&dev->lock);
101         dev->ofdev = ofdev;
102
103         rc = -ENXIO;
104         if (of_address_to_resource(np, 0, &regs)) {
105                 printk(KERN_ERR "%s: Can't get registers address\n",
106                        np->full_name);
107                 goto err_free;
108         }
109
110         rc = -ENOMEM;
111         dev->base = (struct tah_regs __iomem *)ioremap(regs.start,
112                                                sizeof(struct tah_regs));
113         if (dev->base == NULL) {
114                 printk(KERN_ERR "%s: Can't map device registers!\n",
115                        np->full_name);
116                 goto err_free;
117         }
118
119         /* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
120         tah_reset(ofdev);
121
122         printk(KERN_INFO
123                "TAH %s initialized\n", ofdev->node->full_name);
124         wmb();
125         dev_set_drvdata(&ofdev->dev, dev);
126
127         return 0;
128
129  err_free:
130         kfree(dev);
131  err_gone:
132         return rc;
133 }
134
135 static int __devexit tah_remove(struct of_device *ofdev)
136 {
137         struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
138
139         dev_set_drvdata(&ofdev->dev, NULL);
140
141         WARN_ON(dev->users != 0);
142
143         iounmap(dev->base);
144         kfree(dev);
145
146         return 0;
147 }
148
149 static struct of_device_id tah_match[] =
150 {
151         {
152                 .type           = "tah",
153         },
154         {},
155 };
156
157 static struct of_platform_driver tah_driver = {
158         .name = "emac-tah",
159         .match_table = tah_match,
160
161         .probe = tah_probe,
162         .remove = tah_remove,
163 };
164
165 int __init tah_init(void)
166 {
167         return of_register_platform_driver(&tah_driver);
168 }
169
170 void tah_exit(void)
171 {
172         of_unregister_platform_driver(&tah_driver);
173 }