drivers/net/ibm_newemac/rgmii.c - kernel/skids - Git at Google

 /*
  * drivers/net/ibm_newemac/rgmii.c
  *
  * Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support.
  *
  * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
  *                <benh@kernel.crashing.org>
  *
  * Based on the arch/ppc version of the driver:
  *
  * Copyright (c) 2004, 2005 Zultys Technologies.
  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  *
  * Based on original work by
  * 	Matt Porter <mporter@kernel.crashing.org>
  * 	Copyright 2004 MontaVista Software, Inc.
  *
  * 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/slab.h>
 #include <linux/kernel.h>
 #include <linux/ethtool.h>
 #include <asm/io.h>

 #include "emac.h"
 #include "debug.h"

 // XXX FIXME: Axon seems to support a subset of the RGMII, we
 // thus need to take that into account and possibly change some
 // of the bit settings below that don't seem to quite match the
 // AXON spec

 /* RGMIIx_FER */
 #define RGMII_FER_MASK(idx)	(0x7 << ((idx) * 4))
 #define RGMII_FER_RTBI(idx)	(0x4 << ((idx) * 4))
 #define RGMII_FER_RGMII(idx)	(0x5 << ((idx) * 4))
 #define RGMII_FER_TBI(idx)	(0x6 << ((idx) * 4))
 #define RGMII_FER_GMII(idx)	(0x7 << ((idx) * 4))
 #define RGMII_FER_MII(idx)	RGMII_FER_GMII(idx)

 /* RGMIIx_SSR */
 #define RGMII_SSR_MASK(idx)	(0x7 << ((idx) * 8))
 #define RGMII_SSR_100(idx)	(0x2 << ((idx) * 8))
 #define RGMII_SSR_1000(idx)	(0x4 << ((idx) * 8))

 /* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
 static inline int rgmii_valid_mode(int phy_mode)
 {
 	return  phy_mode == PHY_MODE_GMII ||
 		phy_mode == PHY_MODE_MII ||
 		phy_mode == PHY_MODE_RGMII ||
 		phy_mode == PHY_MODE_TBI ||
 		phy_mode == PHY_MODE_RTBI;
 }

 static inline const char *rgmii_mode_name(int mode)
 {
 	switch (mode) {
 	case PHY_MODE_RGMII:
 		return "RGMII";
 	case PHY_MODE_TBI:
 		return "TBI";
 	case PHY_MODE_GMII:
 		return "GMII";
 	case PHY_MODE_MII:
 		return "MII";
 	case PHY_MODE_RTBI:
 		return "RTBI";
 	default:
 		BUG();
 	}
 }

 static inline u32 rgmii_mode_mask(int mode, int input)
 {
 	switch (mode) {
 	case PHY_MODE_RGMII:
 		return RGMII_FER_RGMII(input);
 	case PHY_MODE_TBI:
 		return RGMII_FER_TBI(input);
 	case PHY_MODE_GMII:
 		return RGMII_FER_GMII(input);
 	case PHY_MODE_MII:
 		return RGMII_FER_MII(input);
 	case PHY_MODE_RTBI:
 		return RGMII_FER_RTBI(input);
 	default:
 		BUG();
 	}
 }

 int __devinit rgmii_attach(struct of_device *ofdev, int input, int mode)
 {
 	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 	struct rgmii_regs __iomem *p = dev->base;

 	RGMII_DBG(dev, "attach(%d)" NL, input);

 	/* Check if we need to attach to a RGMII */
 	if (input < 0 || !rgmii_valid_mode(mode)) {
 		printk(KERN_ERR "%s: unsupported settings !\n",
 		       ofdev->dev.of_node->full_name);
 		return -ENODEV;
 	}

 	mutex_lock(&dev->lock);

 	/* Enable this input */
 	out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));

 	printk(KERN_NOTICE "%s: input %d in %s mode\n",
 	       ofdev->dev.of_node->full_name, input, rgmii_mode_name(mode));

 	++dev->users;

 	mutex_unlock(&dev->lock);

 	return 0;
 }

 void rgmii_set_speed(struct of_device *ofdev, int input, int speed)
 {
 	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 	struct rgmii_regs __iomem *p = dev->base;
 	u32 ssr;

 	mutex_lock(&dev->lock);

 	ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);

 	RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);

 	if (speed == SPEED_1000)
 		ssr |= RGMII_SSR_1000(input);
 	else if (speed == SPEED_100)
 		ssr |= RGMII_SSR_100(input);

 	out_be32(&p->ssr, ssr);

 	mutex_unlock(&dev->lock);
 }

 void rgmii_get_mdio(struct of_device *ofdev, int input)
 {
 	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 	struct rgmii_regs __iomem *p = dev->base;
 	u32 fer;

 	RGMII_DBG2(dev, "get_mdio(%d)" NL, input);

 	if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
 		return;

 	mutex_lock(&dev->lock);

 	fer = in_be32(&p->fer);
 	fer |= 0x00080000u >> input;
 	out_be32(&p->fer, fer);
 	(void)in_be32(&p->fer);

 	DBG2(dev, " fer = 0x%08x\n", fer);
 }

 void rgmii_put_mdio(struct of_device *ofdev, int input)
 {
 	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 	struct rgmii_regs __iomem *p = dev->base;
 	u32 fer;

 	RGMII_DBG2(dev, "put_mdio(%d)" NL, input);

 	if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
 		return;

 	fer = in_be32(&p->fer);
 	fer &= ~(0x00080000u >> input);
 	out_be32(&p->fer, fer);
 	(void)in_be32(&p->fer);

 	DBG2(dev, " fer = 0x%08x\n", fer);

 	mutex_unlock(&dev->lock);
 }

 void rgmii_detach(struct of_device *ofdev, int input)
 {
 	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 	struct rgmii_regs __iomem *p;

 	BUG_ON(!dev || dev->users == 0);
 	p = dev->base;

 	mutex_lock(&dev->lock);

 	RGMII_DBG(dev, "detach(%d)" NL, input);

 	/* Disable this input */
 	out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));

 	--dev->users;

 	mutex_unlock(&dev->lock);
 }

 int rgmii_get_regs_len(struct of_device *ofdev)
 {
 	return sizeof(struct emac_ethtool_regs_subhdr) +
 		sizeof(struct rgmii_regs);
 }

 void *rgmii_dump_regs(struct of_device *ofdev, void *buf)
 {
 	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 	struct emac_ethtool_regs_subhdr *hdr = buf;
 	struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);

 	hdr->version = 0;
 	hdr->index = 0; /* for now, are there chips with more than one
 			 * rgmii ? if yes, then we'll add a cell_index
 			 * like we do for emac
 			 */
 	memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
 	return regs + 1;
 }


 static int __devinit rgmii_probe(struct of_device *ofdev,
 				 const struct of_device_id *match)
 {
 	struct device_node *np = ofdev->dev.of_node;
 	struct rgmii_instance *dev;
 	struct resource regs;
 	int rc;

 	rc = -ENOMEM;
 	dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
 	if (dev == NULL) {
 		printk(KERN_ERR "%s: could not allocate RGMII 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 rgmii_regs __iomem *)ioremap(regs.start,
 						 sizeof(struct rgmii_regs));
 	if (dev->base == NULL) {
 		printk(KERN_ERR "%s: Can't map device registers!\n",
 		       np->full_name);
 		goto err_free;
 	}

 	/* Check for RGMII flags */
 	if (of_get_property(ofdev->dev.of_node, "has-mdio", NULL))
 		dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;

 	/* CAB lacks the right properties, fix this up */
 	if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))
 		dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;

 	DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
 	     in_be32(&dev->base->fer), in_be32(&dev->base->ssr));

 	/* Disable all inputs by default */
 	out_be32(&dev->base->fer, 0);

 	printk(KERN_INFO
 	       "RGMII %s initialized with%s MDIO support\n",
 	       ofdev->dev.of_node->full_name,
 	       (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");

 	wmb();
 	dev_set_drvdata(&ofdev->dev, dev);

 	return 0;

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

 static int __devexit rgmii_remove(struct of_device *ofdev)
 {
 	struct rgmii_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 rgmii_match[] =
 {
 	{
 		.compatible	= "ibm,rgmii",
 	},
 	{
 		.type		= "emac-rgmii",
 	},
 	{},
 };

 static struct of_platform_driver rgmii_driver = {
 	.driver = {
 		.name = "emac-rgmii",
 		.owner = THIS_MODULE,
 		.of_match_table = rgmii_match,
 	},
 	.probe = rgmii_probe,
 	.remove = rgmii_remove,
 };

 int __init rgmii_init(void)
 {
 	return of_register_platform_driver(&rgmii_driver);
 }

 void rgmii_exit(void)
 {
 	of_unregister_platform_driver(&rgmii_driver);
 }
	/*
	* drivers/net/ibm_newemac/rgmii.c
	*
	* Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support.
	*
	* Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
	* <benh@kernel.crashing.org>
	*
	* Based on the arch/ppc version of the driver:
	*
	* Copyright (c) 2004, 2005 Zultys Technologies.
	* Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
	*
	* Based on original work by
	* Matt Porter <mporter@kernel.crashing.org>
	* Copyright 2004 MontaVista Software, Inc.
	*
	* 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/slab.h>
	#include <linux/kernel.h>
	#include <linux/ethtool.h>
	#include <asm/io.h>

	#include "emac.h"
	#include "debug.h"

	// XXX FIXME: Axon seems to support a subset of the RGMII, we
	// thus need to take that into account and possibly change some
	// of the bit settings below that don't seem to quite match the
	// AXON spec

	/* RGMIIx_FER */
	#define RGMII_FER_MASK(idx) (0x7 << ((idx) * 4))
	#define RGMII_FER_RTBI(idx) (0x4 << ((idx) * 4))
	#define RGMII_FER_RGMII(idx) (0x5 << ((idx) * 4))
	#define RGMII_FER_TBI(idx) (0x6 << ((idx) * 4))
	#define RGMII_FER_GMII(idx) (0x7 << ((idx) * 4))
	#define RGMII_FER_MII(idx) RGMII_FER_GMII(idx)

	/* RGMIIx_SSR */
	#define RGMII_SSR_MASK(idx) (0x7 << ((idx) * 8))
	#define RGMII_SSR_100(idx) (0x2 << ((idx) * 8))
	#define RGMII_SSR_1000(idx) (0x4 << ((idx) * 8))

	/* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
	static inline int rgmii_valid_mode(int phy_mode)
	{
	return phy_mode == PHY_MODE_GMII \|\|
	phy_mode == PHY_MODE_MII \|\|
	phy_mode == PHY_MODE_RGMII \|\|
	phy_mode == PHY_MODE_TBI \|\|
	phy_mode == PHY_MODE_RTBI;
	}

	static inline const char *rgmii_mode_name(int mode)
	{
	switch (mode) {
	case PHY_MODE_RGMII:
	return "RGMII";
	case PHY_MODE_TBI:
	return "TBI";
	case PHY_MODE_GMII:
	return "GMII";
	case PHY_MODE_MII:
	return "MII";
	case PHY_MODE_RTBI:
	return "RTBI";
	default:
	BUG();
	}
	}

	static inline u32 rgmii_mode_mask(int mode, int input)
	{
	switch (mode) {
	case PHY_MODE_RGMII:
	return RGMII_FER_RGMII(input);
	case PHY_MODE_TBI:
	return RGMII_FER_TBI(input);
	case PHY_MODE_GMII:
	return RGMII_FER_GMII(input);
	case PHY_MODE_MII:
	return RGMII_FER_MII(input);
	case PHY_MODE_RTBI:
	return RGMII_FER_RTBI(input);
	default:
	BUG();
	}
	}

	int __devinit rgmii_attach(struct of_device *ofdev, int input, int mode)
	{
	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	struct rgmii_regs __iomem *p = dev->base;

	RGMII_DBG(dev, "attach(%d)" NL, input);

	/* Check if we need to attach to a RGMII */
	if (input < 0 \|\| !rgmii_valid_mode(mode)) {
	printk(KERN_ERR "%s: unsupported settings !\n",
	ofdev->dev.of_node->full_name);
	return -ENODEV;
	}

	mutex_lock(&dev->lock);

	/* Enable this input */
	out_be32(&p->fer, in_be32(&p->fer) \| rgmii_mode_mask(mode, input));

	printk(KERN_NOTICE "%s: input %d in %s mode\n",
	ofdev->dev.of_node->full_name, input, rgmii_mode_name(mode));

	++dev->users;

	mutex_unlock(&dev->lock);

	return 0;
	}

	void rgmii_set_speed(struct of_device *ofdev, int input, int speed)
	{
	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	struct rgmii_regs __iomem *p = dev->base;
	u32 ssr;

	mutex_lock(&dev->lock);

	ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);

	RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);

	if (speed == SPEED_1000)
	ssr \|= RGMII_SSR_1000(input);
	else if (speed == SPEED_100)
	ssr \|= RGMII_SSR_100(input);

	out_be32(&p->ssr, ssr);

	mutex_unlock(&dev->lock);
	}

	void rgmii_get_mdio(struct of_device *ofdev, int input)
	{
	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	struct rgmii_regs __iomem *p = dev->base;
	u32 fer;

	RGMII_DBG2(dev, "get_mdio(%d)" NL, input);

	if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
	return;

	mutex_lock(&dev->lock);

	fer = in_be32(&p->fer);
	fer \|= 0x00080000u >> input;
	out_be32(&p->fer, fer);
	(void)in_be32(&p->fer);

	DBG2(dev, " fer = 0x%08x\n", fer);
	}

	void rgmii_put_mdio(struct of_device *ofdev, int input)
	{
	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	struct rgmii_regs __iomem *p = dev->base;
	u32 fer;

	RGMII_DBG2(dev, "put_mdio(%d)" NL, input);

	if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
	return;

	fer = in_be32(&p->fer);
	fer &= ~(0x00080000u >> input);
	out_be32(&p->fer, fer);
	(void)in_be32(&p->fer);

	DBG2(dev, " fer = 0x%08x\n", fer);

	mutex_unlock(&dev->lock);
	}

	void rgmii_detach(struct of_device *ofdev, int input)
	{
	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	struct rgmii_regs __iomem *p;

	BUG_ON(!dev \|\| dev->users == 0);
	p = dev->base;

	mutex_lock(&dev->lock);

	RGMII_DBG(dev, "detach(%d)" NL, input);

	/* Disable this input */
	out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));

	--dev->users;

	mutex_unlock(&dev->lock);
	}

	int rgmii_get_regs_len(struct of_device *ofdev)
	{
	return sizeof(struct emac_ethtool_regs_subhdr) +
	sizeof(struct rgmii_regs);
	}

	void rgmii_dump_regs(struct of_device ofdev, void *buf)
	{
	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	struct emac_ethtool_regs_subhdr *hdr = buf;
	struct rgmii_regs regs = (struct rgmii_regs )(hdr + 1);

	hdr->version = 0;
	hdr->index = 0; /* for now, are there chips with more than one
	* rgmii ? if yes, then we'll add a cell_index
	* like we do for emac
	*/
	memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
	return regs + 1;
	}


	static int __devinit rgmii_probe(struct of_device *ofdev,
	const struct of_device_id *match)
	{
	struct device_node *np = ofdev->dev.of_node;
	struct rgmii_instance *dev;
	struct resource regs;
	int rc;

	rc = -ENOMEM;
	dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
	if (dev == NULL) {
	printk(KERN_ERR "%s: could not allocate RGMII 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 rgmii_regs __iomem *)ioremap(regs.start,
	sizeof(struct rgmii_regs));
	if (dev->base == NULL) {
	printk(KERN_ERR "%s: Can't map device registers!\n",
	np->full_name);
	goto err_free;
	}

	/* Check for RGMII flags */
	if (of_get_property(ofdev->dev.of_node, "has-mdio", NULL))
	dev->flags \|= EMAC_RGMII_FLAG_HAS_MDIO;

	/* CAB lacks the right properties, fix this up */
	if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))
	dev->flags \|= EMAC_RGMII_FLAG_HAS_MDIO;

	DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
	in_be32(&dev->base->fer), in_be32(&dev->base->ssr));

	/* Disable all inputs by default */
	out_be32(&dev->base->fer, 0);

	printk(KERN_INFO
	"RGMII %s initialized with%s MDIO support\n",
	ofdev->dev.of_node->full_name,
	(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");

	wmb();
	dev_set_drvdata(&ofdev->dev, dev);

	return 0;

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

	static int __devexit rgmii_remove(struct of_device *ofdev)
	{
	struct rgmii_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 rgmii_match[] =
	{
	{
	.compatible = "ibm,rgmii",
	},
	{
	.type = "emac-rgmii",
	},
	{},
	};

	static struct of_platform_driver rgmii_driver = {
	.driver = {
	.name = "emac-rgmii",
	.owner = THIS_MODULE,
	.of_match_table = rgmii_match,
	},
	.probe = rgmii_probe,
	.remove = rgmii_remove,
	};

	int __init rgmii_init(void)
	{
	return of_register_platform_driver(&rgmii_driver);
	}

	void rgmii_exit(void)
	{
	of_unregister_platform_driver(&rgmii_driver);
	}