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OpenCloudOS-Kernel/drivers/net/ibm_newemac/rgmii.c

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/*
* 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 = {
.name = "emac-rgmii",
.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);
}
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