2 * drivers/net/ethernet/ibm/emac/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.
21 #include <linux/of_address.h>
27 int tah_attach(struct platform_device *ofdev, int channel)
29 struct tah_instance *dev = platform_get_drvdata(ofdev);
31 mutex_lock(&dev->lock);
32 /* Reset has been done at probe() time... nothing else to do for now */
34 mutex_unlock(&dev->lock);
39 void tah_detach(struct platform_device *ofdev, int channel)
41 struct tah_instance *dev = platform_get_drvdata(ofdev);
43 mutex_lock(&dev->lock);
45 mutex_unlock(&dev->lock);
48 void tah_reset(struct platform_device *ofdev)
50 struct tah_instance *dev = platform_get_drvdata(ofdev);
51 struct tah_regs __iomem *p = dev->base;
55 out_be32(&p->mr, TAH_MR_SR);
57 while ((in_be32(&p->mr) & TAH_MR_SR) && n)
61 printk(KERN_ERR "%s: reset timeout\n",
62 ofdev->dev.of_node->full_name);
64 /* 10KB TAH TX FIFO accommodates the max MTU of 9000 */
66 TAH_MR_CVR | TAH_MR_ST_768 | TAH_MR_TFS_10KB | TAH_MR_DTFP |
70 int tah_get_regs_len(struct platform_device *ofdev)
72 return sizeof(struct emac_ethtool_regs_subhdr) +
73 sizeof(struct tah_regs);
76 void *tah_dump_regs(struct platform_device *ofdev, void *buf)
78 struct tah_instance *dev = platform_get_drvdata(ofdev);
79 struct emac_ethtool_regs_subhdr *hdr = buf;
80 struct tah_regs *regs = (struct tah_regs *)(hdr + 1);
83 hdr->index = 0; /* for now, are there chips with more than one
84 * zmii ? if yes, then we'll add a cell_index
87 memcpy_fromio(regs, dev->base, sizeof(struct tah_regs));
91 static int tah_probe(struct platform_device *ofdev)
93 struct device_node *np = ofdev->dev.of_node;
94 struct tah_instance *dev;
99 dev = kzalloc(sizeof(struct tah_instance), GFP_KERNEL);
103 mutex_init(&dev->lock);
107 if (of_address_to_resource(np, 0, ®s)) {
108 printk(KERN_ERR "%s: Can't get registers address\n",
114 dev->base = (struct tah_regs __iomem *)ioremap(regs.start,
115 sizeof(struct tah_regs));
116 if (dev->base == NULL) {
117 printk(KERN_ERR "%s: Can't map device registers!\n",
122 platform_set_drvdata(ofdev, dev);
124 /* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
128 "TAH %s initialized\n", ofdev->dev.of_node->full_name);
139 static int tah_remove(struct platform_device *ofdev)
141 struct tah_instance *dev = platform_get_drvdata(ofdev);
143 WARN_ON(dev->users != 0);
151 static const struct of_device_id tah_match[] =
154 .compatible = "ibm,tah",
156 /* For backward compat with old DT */
163 static struct platform_driver tah_driver = {
166 .of_match_table = tah_match,
169 .remove = tah_remove,
172 int __init tah_init(void)
174 return platform_driver_register(&tah_driver);
179 platform_driver_unregister(&tah_driver);