[linux-block.git] / drivers / net / ibm_newemac / tah.c

/*
 * drivers/net/ibm_newemac/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 <asm/io.h>

#include "emac.h"
#include "core.h"

int __devinit tah_attach(struct of_device *ofdev, int channel)
{
	struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);

	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 __devexit tah_detach(struct of_device *ofdev, int channel)
{
	struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);

	mutex_lock(&dev->lock);
	--dev->users;
	mutex_unlock(&dev->lock);
}

void tah_reset(struct of_device *ofdev)
{
	struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
	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 "%s: reset timeout\n", ofdev->node->full_name);

	/* 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 of_device *ofdev)
{
	return sizeof(struct emac_ethtool_regs_subhdr) +
		sizeof(struct tah_regs);
}

void *tah_dump_regs(struct of_device *ofdev, void *buf)
{
	struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
	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 __devinit tah_probe(struct of_device *ofdev,
			       const struct of_device_id *match)
{
	struct device_node *np = ofdev->node;
	struct tah_instance *dev;
	struct resource regs;
	int rc;

	rc = -ENOMEM;
	dev = kzalloc(sizeof(struct tah_instance), GFP_KERNEL);
	if (dev == NULL) {
		printk(KERN_ERR "%s: could not allocate TAH device!\n",
		       np->full_name);
		goto err_gone;
	}

	mutex_init(&dev->lock);
	dev->ofdev = ofdev;

	rc = -ENXIO;
	if (of_address_to_resource(np, 0, &regs)) {
		printk(KERN_ERR "%s: Can't get registers address\n",
		       np->full_name);
		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 "%s: Can't map device registers!\n",
		       np->full_name);
		goto err_free;
	}

	dev_set_drvdata(&ofdev->dev, dev);

	/* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
	tah_reset(ofdev);

	printk(KERN_INFO
	       "TAH %s initialized\n", ofdev->node->full_name);
	wmb();

	return 0;

 err_free:
	kfree(dev);
 err_gone:
	return rc;
}

static int __devexit tah_remove(struct of_device *ofdev)
{
	struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);

	dev_set_drvdata(&ofdev->dev, NULL);

	WARN_ON(dev->users != 0);

	iounmap(dev->base);
	kfree(dev);

	return 0;
}

static struct of_device_id tah_match[] =
{
	{
		.type		= "tah",
	},
	{},
};

static struct of_platform_driver tah_driver = {
	.name = "emac-tah",
	.match_table = tah_match,

	.probe = tah_probe,
	.remove = tah_remove,
};

int __init tah_init(void)
{
	return of_register_platform_driver(&tah_driver);
}

void tah_exit(void)
{
	of_unregister_platform_driver(&tah_driver);
}
Commit	Line	Data
1d3bb996 DG	1	/*
	2	* drivers/net/ibm_newemac/tah.c
	3	*
	4	* Driver for PowerPC 4xx on-chip ethernet controller, TAH support.
	5	*
17cf803a BH	6	* Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
	7	* <benh@kernel.crashing.org>
	8	*
	9	* Based on the arch/ppc version of the driver:
	10	*
1d3bb996 DG	11	* Copyright 2004 MontaVista Software, Inc.
	12	* Matt Porter <mporter@kernel.crashing.org>
	13	*
	14	* Copyright (c) 2005 Eugene Surovegin <ebs@ebshome.net>
	15	*
	16	* This program is free software; you can redistribute it and/or modify it
	17	* under the terms of the GNU General Public License as published by the
	18	* Free Software Foundation; either version 2 of the License, or (at your
	19	* option) any later version.
	20	*/
	21	#include <asm/io.h>
	22
	23	#include "emac.h"
	24	#include "core.h"
	25
	26	int __devinit tah_attach(struct of_device *ofdev, int channel)
	27	{
	28	struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
	29
	30	mutex_lock(&dev->lock);
	31	/* Reset has been done at probe() time... nothing else to do for now */
	32	++dev->users;
	33	mutex_unlock(&dev->lock);
	34
	35	return 0;
	36	}
	37
	38	void __devexit tah_detach(struct of_device *ofdev, int channel)
	39	{
	40	struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
	41
	42	mutex_lock(&dev->lock);
	43	--dev->users;
	44	mutex_unlock(&dev->lock);
	45	}
	46
	47	void tah_reset(struct of_device *ofdev)
	48	{
	49	struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
eb4d84f1	50	struct tah_regs __iomem *p = dev->base;
1d3bb996 DG	51	int n;
	52
	53	/* Reset TAH */
	54	out_be32(&p->mr, TAH_MR_SR);
	55	n = 100;
	56	while ((in_be32(&p->mr) & TAH_MR_SR) && n)
	57	--n;
	58
	59	if (unlikely(!n))
	60	printk(KERN_ERR "%s: reset timeout\n", ofdev->node->full_name);
	61
	62	/* 10KB TAH TX FIFO accomodates the max MTU of 9000 */
	63	out_be32(&p->mr,
	64	TAH_MR_CVR \| TAH_MR_ST_768 \| TAH_MR_TFS_10KB \| TAH_MR_DTFP \|
	65	TAH_MR_DIG);
	66	}
	67
	68	int tah_get_regs_len(struct of_device *ofdev)
	69	{
	70	return sizeof(struct emac_ethtool_regs_subhdr) +
	71	sizeof(struct tah_regs);
	72	}
	73
	74	void tah_dump_regs(struct of_device ofdev, void *buf)
	75	{
	76	struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
	77	struct emac_ethtool_regs_subhdr *hdr = buf;
	78	struct tah_regs regs = (struct tah_regs )(hdr + 1);
	79
	80	hdr->version = 0;
	81	hdr->index = 0; /* for now, are there chips with more than one
	82	* zmii ? if yes, then we'll add a cell_index
	83	* like we do for emac
	84	*/
	85	memcpy_fromio(regs, dev->base, sizeof(struct tah_regs));
	86	return regs + 1;
	87	}
	88
	89	static int __devinit tah_probe(struct of_device *ofdev,
	90	const struct of_device_id *match)
	91	{
	92	struct device_node *np = ofdev->node;
	93	struct tah_instance *dev;
	94	struct resource regs;
	95	int rc;
	96
	97	rc = -ENOMEM;
	98	dev = kzalloc(sizeof(struct tah_instance), GFP_KERNEL);
	99	if (dev == NULL) {
	100	printk(KERN_ERR "%s: could not allocate TAH device!\n",
	101	np->full_name);
	102	goto err_gone;
	103	}
	104
	105	mutex_init(&dev->lock);
	106	dev->ofdev = ofdev;
	107
	108	rc = -ENXIO;
	109	if (of_address_to_resource(np, 0, &regs)) {
	110	printk(KERN_ERR "%s: Can't get registers address\n",
	111	np->full_name);
	112	goto err_free;
	113	}
	114
115	rc = -ENOMEM;
eb4d84f1	116	dev->base = (struct tah_regs __iomem *)ioremap(regs.start,
1d3bb996 DG	117	sizeof(struct tah_regs));
	118	if (dev->base == NULL) {
	119	printk(KERN_ERR "%s: Can't map device registers!\n",
	120	np->full_name);
	121	goto err_free;
	122	}
	123
d09e18bc VB	124	dev_set_drvdata(&ofdev->dev, dev);
d09e18bc VB	125
1d3bb996 DG	126	/* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
	127	tah_reset(ofdev);
	128
	129	printk(KERN_INFO
	130	"TAH %s initialized\n", ofdev->node->full_name);
	131	wmb();
1d3bb996 DG	132
	133	return 0;
	134
	135	err_free:
	136	kfree(dev);
	137	err_gone:
	138	return rc;
	139	}
	140
	141	static int __devexit tah_remove(struct of_device *ofdev)
	142	{
	143	struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
	144
	145	dev_set_drvdata(&ofdev->dev, NULL);
	146
	147	WARN_ON(dev->users != 0);
	148
	149	iounmap(dev->base);
	150	kfree(dev);
	151
	152	return 0;
	153	}
	154
	155	static struct of_device_id tah_match[] =
	156	{
	157	{
	158	.type = "tah",
	159	},
	160	{},
	161	};
	162
	163	static struct of_platform_driver tah_driver = {
	164	.name = "emac-tah",
	165	.match_table = tah_match,
	166
	167	.probe = tah_probe,
	168	.remove = tah_remove,
	169	};
	170
	171	int __init tah_init(void)
	172	{
	173	return of_register_platform_driver(&tah_driver);
	174	}
	175
	176	void tah_exit(void)
	177	{
	178	of_unregister_platform_driver(&tah_driver);
	179	}