1 /*
2 * drivers/net/ibm_newemac/tah.c
3 *
4 * Driver for PowerPC 4xx on-chip ethernet controller, TAH support.
5 *
6 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
7 * <benh@kernel.crashing.org>
8 *
9 * Based on the arch/ppc version of the driver:
10 *
11 * Copyright 2004 MontaVista Software, Inc.
12 * Matt Porter <mporter@kernel.crashing.org>
13 *
14 * Copyright (c) 2005 Eugene Surovegin <ebs@ebshome.net>
15 *
16 * This program is free software; you can redistribute it and/or modify it
17 * under the terms of the GNU General Public License as published by the
18 * Free Software Foundation; either version 2 of the License, or (at your
19 * option) any later version.
20 */
21 #include <asm/io.h>
22
23 #include "emac.h"
24 #include "core.h"
25
26 int __devinit tah_attach(struct of_device *ofdev, int channel)
27 {
28 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
29
30 mutex_lock(&dev->lock);
31 /* Reset has been done at probe() time... nothing else to do for now */
32 ++dev->users;
33 mutex_unlock(&dev->lock);
34
35 return 0;
36 }
37
38 void __devexit tah_detach(struct of_device *ofdev, int channel)
39 {
40 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
41
42 mutex_lock(&dev->lock);
43 --dev->users;
44 mutex_unlock(&dev->lock);
45 }
46
47 void tah_reset(struct of_device *ofdev)
48 {
49 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
50 struct tah_regs __iomem *p = dev->base;
51 int n;
52
53 /* Reset TAH */
54 out_be32(&p->mr, TAH_MR_SR);
55 n = 100;
56 while ((in_be32(&p->mr) & TAH_MR_SR) && n)
57 --n;
58
59 if (unlikely(!n))
60 printk(KERN_ERR "%s: reset timeout\n", ofdev->node->full_name);
61
62 /* 10KB TAH TX FIFO accomodates the max MTU of 9000 */
63 out_be32(&p->mr,
64 TAH_MR_CVR | TAH_MR_ST_768 | TAH_MR_TFS_10KB | TAH_MR_DTFP |
65 TAH_MR_DIG);
66 }
67
68 int tah_get_regs_len(struct of_device *ofdev)
69 {
70 return sizeof(struct emac_ethtool_regs_subhdr) +
71 sizeof(struct tah_regs);
72 }
73
74 void *tah_dump_regs(struct of_device *ofdev, void *buf)
75 {
76 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
77 struct emac_ethtool_regs_subhdr *hdr = buf;
78 struct tah_regs *regs = (struct tah_regs *)(hdr + 1);
79
80 hdr->version = 0;
81 hdr->index = 0; /* for now, are there chips with more than one
82 * zmii ? if yes, then we'll add a cell_index
83 * like we do for emac
84 */
85 memcpy_fromio(regs, dev->base, sizeof(struct tah_regs));
86 return regs + 1;
87 }
88
89 static int __devinit tah_probe(struct of_device *ofdev,
90 const struct of_device_id *match)
91 {
92 struct device_node *np = ofdev->node;
93 struct tah_instance *dev;
94 struct resource regs;
95 int rc;
96
97 rc = -ENOMEM;
98 dev = kzalloc(sizeof(struct tah_instance), GFP_KERNEL);
99 if (dev == NULL) {
100 printk(KERN_ERR "%s: could not allocate TAH device!\n",
101 np->full_name);
102 goto err_gone;
103 }
104
105 mutex_init(&dev->lock);
106 dev->ofdev = ofdev;
107
108 rc = -ENXIO;
109 if (of_address_to_resource(np, 0, ®s)) {
110 printk(KERN_ERR "%s: Can't get registers address\n",
111 np->full_name);
112 goto err_free;
113 }
114
115 rc = -ENOMEM;
116 dev->base = (struct tah_regs __iomem *)ioremap(regs.start,
117 sizeof(struct tah_regs));
118 if (dev->base == NULL) {
119 printk(KERN_ERR "%s: Can't map device registers!\n",
120 np->full_name);
121 goto err_free;
122 }
123
124 dev_set_drvdata(&ofdev->dev, dev);
125
126 /* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
127 tah_reset(ofdev);
128
129 printk(KERN_INFO
130 "TAH %s initialized\n", ofdev->node->full_name);
131 wmb();
132
133 return 0;
134
135 err_free:
136 kfree(dev);
137 err_gone:
138 return rc;
139 }
140
141 static int __devexit tah_remove(struct of_device *ofdev)
142 {
143 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
144
145 dev_set_drvdata(&ofdev->dev, NULL);
146
147 WARN_ON(dev->users != 0);
148
149 iounmap(dev->base);
150 kfree(dev);
151
152 return 0;
153 }
154
155 static struct of_device_id tah_match[] =
156 {
157 {
158 .compatible = "ibm,tah",
159 },
160 /* For backward compat with old DT */
161 {
162 .type = "tah",
163 },
164 {},
165 };
166
167 static struct of_platform_driver tah_driver = {
168 .name = "emac-tah",
169 .match_table = tah_match,
170
171 .probe = tah_probe,
172 .remove = tah_remove,
173 };
174
175 int __init tah_init(void)
176 {
177 return of_register_platform_driver(&tah_driver);
178 }
179
180 void tah_exit(void)
181 {
182 of_unregister_platform_driver(&tah_driver);
183 }
184
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