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linux/drivers/net/ethernet/ibm/emac/zmii.c

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/*
* drivers/net/ethernet/ibm/emac/zmii.c
*
* Driver for PowerPC 4xx on-chip ethernet controller, ZMII 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
* Armin Kuster <akuster@mvista.com>
* Copyright 2001 MontaVista Softare 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 <linux/of_address.h>
#include <asm/io.h>
#include "emac.h"
#include "core.h"
/* ZMIIx_FER */
#define ZMII_FER_MDI(idx) (0x80000000 >> ((idx) * 4))
#define ZMII_FER_MDI_ALL (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
#define ZMII_FER_SMII(idx) (0x40000000 >> ((idx) * 4))
#define ZMII_FER_RMII(idx) (0x20000000 >> ((idx) * 4))
#define ZMII_FER_MII(idx) (0x10000000 >> ((idx) * 4))
/* ZMIIx_SSR */
#define ZMII_SSR_SCI(idx) (0x40000000 >> ((idx) * 4))
#define ZMII_SSR_FSS(idx) (0x20000000 >> ((idx) * 4))
#define ZMII_SSR_SP(idx) (0x10000000 >> ((idx) * 4))
/* ZMII only supports MII, RMII and SMII
* we also support autodetection for backward compatibility
*/
static inline int zmii_valid_mode(int mode)
{
return mode == PHY_INTERFACE_MODE_MII ||
mode == PHY_INTERFACE_MODE_RMII ||
mode == PHY_INTERFACE_MODE_SMII ||
mode == PHY_INTERFACE_MODE_NA;
}
static inline const char *zmii_mode_name(int mode)
{
switch (mode) {
case PHY_INTERFACE_MODE_MII:
return "MII";
case PHY_INTERFACE_MODE_RMII:
return "RMII";
case PHY_INTERFACE_MODE_SMII:
return "SMII";
default:
BUG();
}
}
static inline u32 zmii_mode_mask(int mode, int input)
{
switch (mode) {
case PHY_INTERFACE_MODE_MII:
return ZMII_FER_MII(input);
case PHY_INTERFACE_MODE_RMII:
return ZMII_FER_RMII(input);
case PHY_INTERFACE_MODE_SMII:
return ZMII_FER_SMII(input);
default:
return 0;
}
}
int zmii_attach(struct platform_device *ofdev, int input, int *mode)
{
struct zmii_instance *dev = platform_get_drvdata(ofdev);
struct zmii_regs __iomem *p = dev->base;
ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);
if (!zmii_valid_mode(*mode)) {
/* Probably an EMAC connected to RGMII,
* but it still may need ZMII for MDIO so
* we don't fail here.
*/
dev->users++;
return 0;
}
mutex_lock(&dev->lock);
/* Autodetect ZMII mode if not specified.
* This is only for backward compatibility with the old driver.
* Please, always specify PHY mode in your board port to avoid
* any surprises.
*/
if (dev->mode == PHY_INTERFACE_MODE_NA) {
if (*mode == PHY_INTERFACE_MODE_NA) {
u32 r = dev->fer_save;
ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r);
if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
dev->mode = PHY_INTERFACE_MODE_MII;
else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
dev->mode = PHY_INTERFACE_MODE_RMII;
else
dev->mode = PHY_INTERFACE_MODE_SMII;
} else {
dev->mode = *mode;
}
printk(KERN_NOTICE "%pOF: bridge in %s mode\n",
ofdev->dev.of_node,
zmii_mode_name(dev->mode));
} else {
/* All inputs must use the same mode */
if (*mode != PHY_INTERFACE_MODE_NA && *mode != dev->mode) {
printk(KERN_ERR
"%pOF: invalid mode %d specified for input %d\n",
ofdev->dev.of_node, *mode, input);
mutex_unlock(&dev->lock);
return -EINVAL;
}
}
/* Report back correct PHY mode,
* it may be used during PHY initialization.
*/
*mode = dev->mode;
/* Enable this input */
out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
++dev->users;
mutex_unlock(&dev->lock);
return 0;
}
void zmii_get_mdio(struct platform_device *ofdev, int input)
{
struct zmii_instance *dev = platform_get_drvdata(ofdev);
u32 fer;
ZMII_DBG2(dev, "get_mdio(%d)" NL, input);
mutex_lock(&dev->lock);
fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
}
void zmii_put_mdio(struct platform_device *ofdev, int input)
{
struct zmii_instance *dev = platform_get_drvdata(ofdev);
ZMII_DBG2(dev, "put_mdio(%d)" NL, input);
mutex_unlock(&dev->lock);
}
void zmii_set_speed(struct platform_device *ofdev, int input, int speed)
{
struct zmii_instance *dev = platform_get_drvdata(ofdev);
u32 ssr;
mutex_lock(&dev->lock);
ssr = in_be32(&dev->base->ssr);
ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
if (speed == SPEED_100)
ssr |= ZMII_SSR_SP(input);
else
ssr &= ~ZMII_SSR_SP(input);
out_be32(&dev->base->ssr, ssr);
mutex_unlock(&dev->lock);
}
void zmii_detach(struct platform_device *ofdev, int input)
{
struct zmii_instance *dev = platform_get_drvdata(ofdev);
BUG_ON(!dev || dev->users == 0);
mutex_lock(&dev->lock);
ZMII_DBG(dev, "detach(%d)" NL, input);
/* Disable this input */
out_be32(&dev->base->fer,
in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
--dev->users;
mutex_unlock(&dev->lock);
}
int zmii_get_regs_len(struct platform_device *ofdev)
{
return sizeof(struct emac_ethtool_regs_subhdr) +
sizeof(struct zmii_regs);
}
void *zmii_dump_regs(struct platform_device *ofdev, void *buf)
{
struct zmii_instance *dev = platform_get_drvdata(ofdev);
struct emac_ethtool_regs_subhdr *hdr = buf;
struct zmii_regs *regs = (struct zmii_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 zmii_regs));
return regs + 1;
}
static int zmii_probe(struct platform_device *ofdev)
{
struct device_node *np = ofdev->dev.of_node;
struct zmii_instance *dev;
struct resource regs;
int rc;
rc = -ENOMEM;
dev = kzalloc(sizeof(struct zmii_instance), GFP_KERNEL);
if (dev == NULL)
goto err_gone;
mutex_init(&dev->lock);
dev->ofdev = ofdev;
dev->mode = PHY_INTERFACE_MODE_NA;
rc = -ENXIO;
if (of_address_to_resource(np, 0, &regs)) {
printk(KERN_ERR "%pOF: Can't get registers address\n", np);
goto err_free;
}
rc = -ENOMEM;
dev->base = (struct zmii_regs __iomem *)ioremap(regs.start,
sizeof(struct zmii_regs));
if (dev->base == NULL) {
printk(KERN_ERR "%pOF: Can't map device registers!\n", np);
goto err_free;
}
/* We may need FER value for autodetection later */
dev->fer_save = in_be32(&dev->base->fer);
/* Disable all inputs by default */
out_be32(&dev->base->fer, 0);
printk(KERN_INFO "ZMII %pOF initialized\n", ofdev->dev.of_node);
wmb();
platform_set_drvdata(ofdev, dev);
return 0;
err_free:
kfree(dev);
err_gone:
return rc;
}
static int zmii_remove(struct platform_device *ofdev)
{
struct zmii_instance *dev = platform_get_drvdata(ofdev);
WARN_ON(dev->users != 0);
iounmap(dev->base);
kfree(dev);
return 0;
}
static const struct of_device_id zmii_match[] =
{
{
.compatible = "ibm,zmii",
},
/* For backward compat with old DT */
{
.type = "emac-zmii",
},
{},
};
static struct platform_driver zmii_driver = {
.driver = {
.name = "emac-zmii",
.of_match_table = zmii_match,
},
.probe = zmii_probe,
.remove = zmii_remove,
};
int __init zmii_init(void)
{
return platform_driver_register(&zmii_driver);
}
void zmii_exit(void)
{
platform_driver_unregister(&zmii_driver);
}
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