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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* drivers/net/ethernet/ibm/emac/tah.c
*
* Driver for PowerPC 4xx on-chip ethernet controller, TAH support.
*
* Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
* <benh@kernel.crashing.org>
*
* Based on the arch/ppc version of the driver:
*
* Copyright 2004 MontaVista Software, Inc.
* Matt Porter <mporter@kernel.crashing.org>
*
* Copyright (c) 2005 Eugene Surovegin <ebs@ebshome.net>
*/
#include <linux/mod_devicetable.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <asm/io.h>
#include "emac.h"
#include "core.h"
int tah_attach(struct platform_device *ofdev, int channel)
{
struct tah_instance *dev = platform_get_drvdata(ofdev);
mutex_lock(&dev->lock);
/* Reset has been done at probe() time... nothing else to do for now */
++dev->users;
mutex_unlock(&dev->lock);
return 0;
}
void tah_detach(struct platform_device *ofdev, int channel)
{
struct tah_instance *dev = platform_get_drvdata(ofdev);
mutex_lock(&dev->lock);
--dev->users;
mutex_unlock(&dev->lock);
}
void tah_reset(struct platform_device *ofdev)
{
struct tah_instance *dev = platform_get_drvdata(ofdev);
struct tah_regs __iomem *p = dev->base;
int n;
/* Reset TAH */
out_be32(&p->mr, TAH_MR_SR);
n = 100;
while ((in_be32(&p->mr) & TAH_MR_SR) && n)
--n;
if (unlikely(!n))
printk(KERN_ERR "%pOF: reset timeout\n", ofdev->dev.of_node);
/* 10KB TAH TX FIFO accommodates the max MTU of 9000 */
out_be32(&p->mr,
TAH_MR_CVR | TAH_MR_ST_768 | TAH_MR_TFS_10KB | TAH_MR_DTFP |
TAH_MR_DIG);
}
int tah_get_regs_len(struct platform_device *ofdev)
{
return sizeof(struct emac_ethtool_regs_subhdr) +
sizeof(struct tah_regs);
}
void *tah_dump_regs(struct platform_device *ofdev, void *buf)
{
struct tah_instance *dev = platform_get_drvdata(ofdev);
struct emac_ethtool_regs_subhdr *hdr = buf;
struct tah_regs *regs = (struct tah_regs *)(hdr + 1);
hdr->version = 0;
hdr->index = 0; /* for now, are there chips with more than one
* zmii ? if yes, then we'll add a cell_index
* like we do for emac
*/
memcpy_fromio(regs, dev->base, sizeof(struct tah_regs));
return regs + 1;
}
static int tah_probe(struct platform_device *ofdev)
{
struct device_node *np = ofdev->dev.of_node;
struct tah_instance *dev;
struct resource regs;
int rc;
rc = -ENOMEM;
dev = kzalloc(sizeof(struct tah_instance), GFP_KERNEL);
if (dev == NULL)
goto err_gone;
mutex_init(&dev->lock);
dev->ofdev = ofdev;
rc = -ENXIO;
if (of_address_to_resource(np, 0, ®s)) {
printk(KERN_ERR "%pOF: Can't get registers address\n", np);
goto err_free;
}
rc = -ENOMEM;
dev->base = (struct tah_regs __iomem *)ioremap(regs.start,
sizeof(struct tah_regs));
if (dev->base == NULL) {
printk(KERN_ERR "%pOF: Can't map device registers!\n", np);
goto err_free;
}
platform_set_drvdata(ofdev, dev);
/* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
tah_reset(ofdev);
printk(KERN_INFO "TAH %pOF initialized\n", ofdev->dev.of_node);
wmb();
return 0;
err_free:
kfree(dev);
err_gone:
return rc;
}
static int tah_remove(struct platform_device *ofdev)
{
struct tah_instance *dev = platform_get_drvdata(ofdev);
WARN_ON(dev->users != 0);
iounmap(dev->base);
kfree(dev);
return 0;
}
static const struct of_device_id tah_match[] =
{
{
.compatible = "ibm,tah",
},
/* For backward compat with old DT */
{
.type = "tah",
},
{},
};
static struct platform_driver tah_driver = {
.driver = {
.name = "emac-tah",
.of_match_table = tah_match,
},
.probe = tah_probe,
.remove = tah_remove,
};
int __init tah_init(void)
{
return platform_driver_register(&tah_driver);
}
void tah_exit(void)
{
platform_driver_unregister(&tah_driver);
}
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