2 * drivers/net/ibm_newemac/tah.c
4 * Driver for PowerPC 4xx on-chip ethernet controller, TAH support.
6 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
7 * <benh@kernel.crashing.org>
9 * Based on the arch/ppc version of the driver:
11 * Copyright 2004 MontaVista Software, Inc.
12 * Matt Porter <mporter@kernel.crashing.org>
14 * Copyright (c) 2005 Eugene Surovegin <ebs@ebshome.net>
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.
26 int __devinit tah_attach(struct of_device *ofdev, int channel)
28 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
30 mutex_lock(&dev->lock);
31 /* Reset has been done at probe() time... nothing else to do for now */
33 mutex_unlock(&dev->lock);
38 void tah_detach(struct of_device *ofdev, int channel)
40 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
42 mutex_lock(&dev->lock);
44 mutex_unlock(&dev->lock);
47 void tah_reset(struct of_device *ofdev)
49 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
50 struct tah_regs __iomem *p = dev->base;
54 out_be32(&p->mr, TAH_MR_SR);
56 while ((in_be32(&p->mr) & TAH_MR_SR) && n)
60 printk(KERN_ERR "%s: reset timeout\n", ofdev->node->full_name);
62 /* 10KB TAH TX FIFO accomodates the max MTU of 9000 */
64 TAH_MR_CVR | TAH_MR_ST_768 | TAH_MR_TFS_10KB | TAH_MR_DTFP |
68 int tah_get_regs_len(struct of_device *ofdev)
70 return sizeof(struct emac_ethtool_regs_subhdr) +
71 sizeof(struct tah_regs);
74 void *tah_dump_regs(struct of_device *ofdev, void *buf)
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);
81 hdr->index = 0; /* for now, are there chips with more than one
82 * zmii ? if yes, then we'll add a cell_index
85 memcpy_fromio(regs, dev->base, sizeof(struct tah_regs));
89 static int __devinit tah_probe(struct of_device *ofdev,
90 const struct of_device_id *match)
92 struct device_node *np = ofdev->node;
93 struct tah_instance *dev;
98 dev = kzalloc(sizeof(struct tah_instance), GFP_KERNEL);
100 printk(KERN_ERR "%s: could not allocate TAH device!\n",
105 mutex_init(&dev->lock);
109 if (of_address_to_resource(np, 0, ®s)) {
110 printk(KERN_ERR "%s: Can't get registers address\n",
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",
124 dev_set_drvdata(&ofdev->dev, dev);
126 /* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
130 "TAH %s initialized\n", ofdev->node->full_name);
141 static int __devexit tah_remove(struct of_device *ofdev)
143 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
145 dev_set_drvdata(&ofdev->dev, NULL);
147 WARN_ON(dev->users != 0);
155 static struct of_device_id tah_match[] =
158 .compatible = "ibm,tah",
160 /* For backward compat with old DT */
167 static struct of_platform_driver tah_driver = {
169 .match_table = tah_match,
172 .remove = tah_remove,
175 int __init tah_init(void)
177 return of_register_platform_driver(&tah_driver);
182 of_unregister_platform_driver(&tah_driver);