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/*
* drivers/net/ibm_emac/ibm_emac_tah.c
*
* Driver for PowerPC 4xx on-chip ethernet controller, TAH support.
*
* 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 <asm/io.h>
#include "ibm_emac_core.h"
static int __init tah_init(struct ocp_device *ocpdev)
{
struct tah_regs *p;
if (ocp_get_drvdata(ocpdev)) {
printk(KERN_ERR "tah%d: already in use!\n", ocpdev->def->index);
return -EBUSY;
}
/* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
p = (struct tah_regs *)ioremap(ocpdev->def->paddr, sizeof(*p));
if (!p) {
printk(KERN_ERR "tah%d: could not ioremap device registers!\n",
ocpdev->def->index);
return -ENOMEM;
}
ocp_set_drvdata(ocpdev, p);
__tah_reset(ocpdev);
return 0;
}
int __init tah_attach(void *emac)
{
struct ocp_enet_private *dev = emac;
struct ocp_func_emac_data *emacdata = dev->def->additions;
/* Check if we need to attach to a TAH */
if (emacdata->tah_idx >= 0) {
dev->tah_dev = ocp_find_device(OCP_ANY_ID, OCP_FUNC_TAH,
emacdata->tah_idx);
if (!dev->tah_dev) {
printk(KERN_ERR "emac%d: unknown tah%d!\n",
dev->def->index, emacdata->tah_idx);
return -ENODEV;
}
if (tah_init(dev->tah_dev)) {
printk(KERN_ERR
"emac%d: tah%d initialization failed!\n",
dev->def->index, emacdata->tah_idx);
return -ENODEV;
}
}
return 0;
}
void __exit __tah_fini(struct ocp_device *ocpdev)
{
struct tah_regs *p = ocp_get_drvdata(ocpdev);
BUG_ON(!p);
ocp_set_drvdata(ocpdev, NULL);
iounmap((void *)p);
}
void __tah_reset(struct ocp_device *ocpdev)
{
struct tah_regs *p = ocp_get_drvdata(ocpdev);
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 "tah%d: reset timeout\n", ocpdev->def->index);
/* 10KB TAH TX FIFO accomodates 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 ocp_device *ocpdev)
{
return sizeof(struct emac_ethtool_regs_subhdr) +
sizeof(struct tah_regs);
}
void *tah_dump_regs(struct ocp_device *ocpdev, void *buf)
{
struct tah_regs *dev = ocp_get_drvdata(ocpdev);
struct emac_ethtool_regs_subhdr *hdr = buf;
struct tah_regs *regs = (struct tah_regs *)(hdr + 1);
hdr->version = 0;
hdr->index = ocpdev->def->index;
memcpy_fromio(regs, dev, sizeof(struct tah_regs));
return regs + 1;
}
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