// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* drivers/net/ethernet/ibm/emac/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 2007 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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*
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* Based on the arch/ppc version of the driver:
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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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#include <linux/of_address.h>
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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 tah_attach(struct platform_device *ofdev, int channel)
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{
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struct tah_instance *dev = platform_get_drvdata(ofdev);
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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 tah_detach(struct platform_device *ofdev, int channel)
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{
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struct tah_instance *dev = platform_get_drvdata(ofdev);
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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 platform_device *ofdev)
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{
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struct tah_instance *dev = platform_get_drvdata(ofdev);
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struct tah_regs __iomem *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 "%pOF: reset timeout\n", ofdev->dev.of_node);
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/* 10KB TAH TX FIFO accommodates 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 platform_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 platform_device *ofdev, void *buf)
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{
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struct tah_instance *dev = platform_get_drvdata(ofdev);
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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 tah_probe(struct platform_device *ofdev)
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{
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struct device_node *np = ofdev->dev.of_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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goto err_gone;
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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 "%pOF: Can't get registers address\n", np);
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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 __iomem *)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 "%pOF: Can't map device registers!\n", np);
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goto err_free;
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}
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platform_set_drvdata(ofdev, dev);
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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 "TAH %pOF initialized\n", ofdev->dev.of_node);
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wmb();
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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 tah_remove(struct platform_device *ofdev)
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{
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struct tah_instance *dev = platform_get_drvdata(ofdev);
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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 const struct of_device_id tah_match[] =
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{
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{
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.compatible = "ibm,tah",
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},
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/* For backward compat with old DT */
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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 platform_driver tah_driver = {
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.driver = {
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.name = "emac-tah",
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.of_match_table = tah_match,
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},
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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 platform_driver_register(&tah_driver);
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}
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void tah_exit(void)
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{
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platform_driver_unregister(&tah_driver);
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}
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