![David Gibson](/assets/img/avatar_default.png)
Based on BenH's earlier work, this is a new version of the EMAC driver for the built-in ethernet found on PowerPC 4xx embedded CPUs. The same ASIC is also found in the Axon bridge chip. This new version is designed to work in the arch/powerpc tree, using the device tree to probe the device, rather than the old and ugly arch/ppc OCP layer. This driver is designed to sit alongside the old driver (that lies in drivers/net/ibm_emac and this one in drivers/net/ibm_newemac). The old driver is left in place to support arch/ppc until arch/ppc itself reaches its final demise (not too long now, with luck). This driver still has a number of things that could do with cleaning up, but I think they can be fixed up after merging. Specifically: - Should be adjusted to properly use the dma mapping API. Axon needs this. - Probe logic needs reworking, in conjuction with the general probing code for of_platform devices. The dependencies here between EMAC, MAL, ZMII etc. make this complicated. At present, it usually works, because we initialize and register the sub-drivers before the EMAC driver itself, and (being in driver code) runs after the devices themselves have been instantiated from the device tree. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Jeff Garzik <jeff@garzik.org>
174 lines
3.8 KiB
C
174 lines
3.8 KiB
C
/*
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* drivers/net/ibm_newemac/tah.c
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*
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* Driver for PowerPC 4xx on-chip ethernet controller, TAH support.
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*
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* Copyright 2004 MontaVista Software, Inc.
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* Matt Porter <mporter@kernel.crashing.org>
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*
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* Copyright (c) 2005 Eugene Surovegin <ebs@ebshome.net>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <asm/io.h>
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#include "emac.h"
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#include "core.h"
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int __devinit tah_attach(struct of_device *ofdev, int channel)
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{
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struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
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mutex_lock(&dev->lock);
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/* Reset has been done at probe() time... nothing else to do for now */
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++dev->users;
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mutex_unlock(&dev->lock);
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return 0;
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}
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void __devexit tah_detach(struct of_device *ofdev, int channel)
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{
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struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
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mutex_lock(&dev->lock);
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--dev->users;
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mutex_unlock(&dev->lock);
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}
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void tah_reset(struct of_device *ofdev)
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{
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struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
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struct tah_regs *p = dev->base;
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int n;
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/* Reset TAH */
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out_be32(&p->mr, TAH_MR_SR);
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n = 100;
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while ((in_be32(&p->mr) & TAH_MR_SR) && n)
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--n;
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if (unlikely(!n))
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printk(KERN_ERR "%s: reset timeout\n", ofdev->node->full_name);
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/* 10KB TAH TX FIFO accomodates the max MTU of 9000 */
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out_be32(&p->mr,
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TAH_MR_CVR | TAH_MR_ST_768 | TAH_MR_TFS_10KB | TAH_MR_DTFP |
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TAH_MR_DIG);
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}
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int tah_get_regs_len(struct of_device *ofdev)
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{
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return sizeof(struct emac_ethtool_regs_subhdr) +
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sizeof(struct tah_regs);
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}
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void *tah_dump_regs(struct of_device *ofdev, void *buf)
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{
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struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
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struct emac_ethtool_regs_subhdr *hdr = buf;
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struct tah_regs *regs = (struct tah_regs *)(hdr + 1);
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hdr->version = 0;
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hdr->index = 0; /* for now, are there chips with more than one
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* zmii ? if yes, then we'll add a cell_index
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* like we do for emac
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*/
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memcpy_fromio(regs, dev->base, sizeof(struct tah_regs));
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return regs + 1;
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}
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static int __devinit tah_probe(struct of_device *ofdev,
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const struct of_device_id *match)
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{
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struct device_node *np = ofdev->node;
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struct tah_instance *dev;
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struct resource regs;
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int rc;
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rc = -ENOMEM;
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dev = kzalloc(sizeof(struct tah_instance), GFP_KERNEL);
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if (dev == NULL) {
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printk(KERN_ERR "%s: could not allocate TAH device!\n",
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np->full_name);
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goto err_gone;
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}
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mutex_init(&dev->lock);
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dev->ofdev = ofdev;
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rc = -ENXIO;
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if (of_address_to_resource(np, 0, ®s)) {
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printk(KERN_ERR "%s: Can't get registers address\n",
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np->full_name);
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goto err_free;
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}
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rc = -ENOMEM;
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dev->base = (struct tah_regs *)ioremap(regs.start,
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sizeof(struct tah_regs));
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if (dev->base == NULL) {
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printk(KERN_ERR "%s: Can't map device registers!\n",
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np->full_name);
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goto err_free;
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}
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/* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
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tah_reset(ofdev);
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printk(KERN_INFO
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"TAH %s initialized\n", ofdev->node->full_name);
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wmb();
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dev_set_drvdata(&ofdev->dev, dev);
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return 0;
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err_free:
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kfree(dev);
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err_gone:
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return rc;
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}
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static int __devexit tah_remove(struct of_device *ofdev)
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{
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struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
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dev_set_drvdata(&ofdev->dev, NULL);
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WARN_ON(dev->users != 0);
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iounmap(dev->base);
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kfree(dev);
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return 0;
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}
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static struct of_device_id tah_match[] =
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{
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{
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.type = "tah",
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},
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{},
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};
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static struct of_platform_driver tah_driver = {
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.name = "emac-tah",
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.match_table = tah_match,
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.probe = tah_probe,
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.remove = tah_remove,
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};
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int __init tah_init(void)
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{
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return of_register_platform_driver(&tah_driver);
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}
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void tah_exit(void)
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{
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of_unregister_platform_driver(&tah_driver);
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}
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