177 lines
3.8 KiB
C
177 lines
3.8 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
#include <linux/of_address.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);
|
|
}
|