[mirror_ubuntu-bionic-kernel.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 platform_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 tah_detach(struct platform_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 platform_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->dev.of_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 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 = 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 platform_device *ofdev,
			       const struct of_device_id *match)
{
	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) {
		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->dev.of_node->full_name);
	wmb();

	return 0;

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

static int __devexit tah_remove(struct platform_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[] =
{
	{
		.compatible	= "ibm,tah",
	},
	/* For backward compat with old DT */
	{
		.type		= "tah",
	},
	{},
};

static struct of_platform_driver tah_driver = {
	.driver = {
		.name = "emac-tah",
		.owner = THIS_MODULE,
		.of_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
2dc11581	26	int __devinit tah_attach(struct platform_device *ofdev, int channel)
1d3bb996 DG	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
2dc11581	38	void tah_detach(struct platform_device *ofdev, int channel)
1d3bb996 DG	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
2dc11581	47	void tah_reset(struct platform_device *ofdev)
1d3bb996 DG	48	{
1d3bb996 DG	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))
61c7a080 GL	60	printk(KERN_ERR "%s: reset timeout\n",
61c7a080 GL	61	ofdev->dev.of_node->full_name);
1d3bb996 DG	62
	63	/* 10KB TAH TX FIFO accomodates the max MTU of 9000 */
	64	out_be32(&p->mr,
	65	TAH_MR_CVR \| TAH_MR_ST_768 \| TAH_MR_TFS_10KB \| TAH_MR_DTFP \|
	66	TAH_MR_DIG);
	67	}
	68
2dc11581	69	int tah_get_regs_len(struct platform_device *ofdev)
1d3bb996 DG	70	{
	71	return sizeof(struct emac_ethtool_regs_subhdr) +
	72	sizeof(struct tah_regs);
	73	}
	74
2dc11581	75	void tah_dump_regs(struct platform_device ofdev, void *buf)
1d3bb996 DG	76	{
	77	struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
	78	struct emac_ethtool_regs_subhdr *hdr = buf;
	79	struct tah_regs regs = (struct tah_regs )(hdr + 1);
	80
	81	hdr->version = 0;
	82	hdr->index = 0; /* for now, are there chips with more than one
	83	* zmii ? if yes, then we'll add a cell_index
	84	* like we do for emac
	85	*/
	86	memcpy_fromio(regs, dev->base, sizeof(struct tah_regs));
	87	return regs + 1;
	88	}
	89
2dc11581	90	static int __devinit tah_probe(struct platform_device *ofdev,
1d3bb996 DG	91	const struct of_device_id *match)
1d3bb996 DG	92	{
61c7a080	93	struct device_node *np = ofdev->dev.of_node;
1d3bb996 DG	94	struct tah_instance *dev;
	95	struct resource regs;
	96	int rc;
	97
	98	rc = -ENOMEM;
	99	dev = kzalloc(sizeof(struct tah_instance), GFP_KERNEL);
	100	if (dev == NULL) {
	101	printk(KERN_ERR "%s: could not allocate TAH device!\n",
	102	np->full_name);
	103	goto err_gone;
	104	}
	105
	106	mutex_init(&dev->lock);
	107	dev->ofdev = ofdev;
	108
	109	rc = -ENXIO;
	110	if (of_address_to_resource(np, 0, &regs)) {
	111	printk(KERN_ERR "%s: Can't get registers address\n",
	112	np->full_name);
	113	goto err_free;
	114	}
	115
	116	rc = -ENOMEM;
eb4d84f1	117	dev->base = (struct tah_regs __iomem *)ioremap(regs.start,
1d3bb996 DG	118	sizeof(struct tah_regs));
	119	if (dev->base == NULL) {
	120	printk(KERN_ERR "%s: Can't map device registers!\n",
	121	np->full_name);
	122	goto err_free;
	123	}
	124
d09e18bc VB	125	dev_set_drvdata(&ofdev->dev, dev);
d09e18bc VB	126
1d3bb996 DG	127	/* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
	128	tah_reset(ofdev);
	129
	130	printk(KERN_INFO
61c7a080	131	"TAH %s initialized\n", ofdev->dev.of_node->full_name);
1d3bb996	132	wmb();
1d3bb996 DG	133
	134	return 0;
	135
	136	err_free:
	137	kfree(dev);
	138	err_gone:
	139	return rc;
	140	}
	141
2dc11581	142	static int __devexit tah_remove(struct platform_device *ofdev)
1d3bb996 DG	143	{
	144	struct tah_instance *dev = dev_get_drvdata(&ofdev->dev);
	145
	146	dev_set_drvdata(&ofdev->dev, NULL);
	147
	148	WARN_ON(dev->users != 0);
	149
	150	iounmap(dev->base);
	151	kfree(dev);
	152
	153	return 0;
	154	}
	155
	156	static struct of_device_id tah_match[] =
	157	{
cdb34697 SR	158	{
	159	.compatible = "ibm,tah",
	160	},
	161	/* For backward compat with old DT */
1d3bb996 DG	162	{
	163	.type = "tah",
	164	},
	165	{},
	166	};
	167
	168	static struct of_platform_driver tah_driver = {
4018294b GL	169	.driver = {
	170	.name = "emac-tah",
	171	.owner = THIS_MODULE,
	172	.of_match_table = tah_match,
	173	},
1d3bb996 DG	174	.probe = tah_probe,
	175	.remove = tah_remove,
	176	};
	177
	178	int __init tah_init(void)
	179	{
	180	return of_register_platform_driver(&tah_driver);
	181	}
	182
	183	void tah_exit(void)
	184	{
	185	of_unregister_platform_driver(&tah_driver);
	186	}