/*
* drivers/net/ibm_emac/ibm_emac_zmii.c
*
* Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support.
*
* 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/kernel.h>
#include <linux/ethtool.h>
#include <asm/io.h>
#include "ibm_emac_core.h"
#include "ibm_emac_debug.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_MODE_MII ||
mode == PHY_MODE_RMII ||
mode == PHY_MODE_SMII ||
mode == PHY_MODE_NA;
}
static inline const char *zmii_mode_name(int mode)
{
switch (mode) {
case PHY_MODE_MII:
return "MII";
case PHY_MODE_RMII:
return "RMII";
case PHY_MODE_SMII:
return "SMII";
default:
BUG();
}
}
static inline u32 zmii_mode_mask(int mode, int input)
{
switch (mode) {
case PHY_MODE_MII:
return ZMII_FER_MII(input);
case PHY_MODE_RMII:
return ZMII_FER_RMII(input);
case PHY_MODE_SMII:
return ZMII_FER_SMII(input);
default:
return 0;
}
}
static int __init zmii_init(struct ocp_device *ocpdev, int input, int *mode)
{
struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
struct zmii_regs __iomem *p;
ZMII_DBG("%d: init(%d, %d)" NL, ocpdev->def->index, input, *mode);
if (!dev) {
dev = kzalloc(sizeof(struct ibm_ocp_zmii), GFP_KERNEL);
if (!dev) {
printk(KERN_ERR
"zmii%d: couldn't allocate device structure!\n",
ocpdev->def->index);
return -ENOMEM;
}
dev->mode = PHY_MODE_NA;
p = ioremap(ocpdev->def->paddr, sizeof(struct zmii_regs));
if (!p) {
printk(KERN_ERR
"zmii%d: could not ioremap device registers!\n",
ocpdev->def->index);
kfree(dev);
return -ENOMEM;
}
dev->base = p;
ocp_set_drvdata(ocpdev, dev);
/* We may need FER value for autodetection later */
dev->fer_save = in_be32(&p->fer);
/* Disable all inputs by default */
out_be32(&p->fer, 0);
} else
p = dev->base;
if (!zmii_valid_mode(*mode)) {
/* Probably an EMAC connected to RGMII,
* but it still may need ZMII for MDIO
*/
goto out;
}
/* 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_MODE_NA) {
if (*mode == PHY_MODE_NA) {
u32 r = dev->fer_save;
ZMII_DBG("%d: autodetecting mode, FER = 0x%08x" NL,
ocpdev->def->index, r);
if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
dev->mode = PHY_MODE_MII;
else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
dev->mode = PHY_MODE_RMII;
else
dev->mode = PHY_MODE_SMII;
} else
dev->mode = *mode;
printk(KERN_NOTICE "zmii%d: bridge in %s mode\n",
ocpdev->def->index, zmii_mode_name(dev->mode));
} else {
/* All inputs must use the same mode */
if (*mode != PHY_MODE_NA && *mode != dev->mode) {
printk(KERN_ERR
"zmii%d: invalid mode %d specified for input %d\n",
ocpdev->def->index, *mode, input);
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));
out:
++dev->users;
return 0;
}
int __init zmii_attach(void *emac)
{
struct ocp_enet_private *dev = emac;
struct ocp_func_emac_data *emacdata = dev->def->additions;
if (emacdata->zmii_idx >= 0) {
dev->zmii_input = emacdata->zmii_mux;
dev->zmii_dev =
ocp_find_device(OCP_VENDOR_IBM, OCP_FUNC_ZMII,
emacdata->zmii_idx);
if (!dev->zmii_dev) {
printk(KERN_ERR "emac%d: unknown zmii%d!\n",
dev->def->index, emacdata->zmii_idx);
return -ENODEV;
}
if (zmii_init
(dev->zmii_dev, dev->zmii_input, &emacdata->phy_mode)) {
printk(KERN_ERR
"emac%d: zmii%d initialization failed!\n",
dev->def->index, emacdata->zmii_idx);
return -ENODEV;
}
}
return 0;
}
void __zmii_enable_mdio(struct ocp_device *ocpdev, int input)
{
struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
u32 fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
ZMII_DBG2("%d: mdio(%d)" NL, ocpdev->def->index, input);
out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
}
void __zmii_set_speed(struct ocp_device *ocpdev, int input, int speed)
{
struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
u32 ssr = in_be32(&dev->base->ssr);
ZMII_DBG("%d: speed(%d, %d)" NL, ocpdev->def->index, input, speed);
if (speed == SPEED_100)
ssr |= ZMII_SSR_SP(input);
else
ssr &= ~ZMII_SSR_SP(input);
out_be32(&dev->base->ssr, ssr);
}
void __zmii_fini(struct ocp_device *ocpdev, int input)
{
struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
BUG_ON(!dev || dev->users == 0);
ZMII_DBG("%d: fini(%d)" NL, ocpdev->def->index, input);
/* Disable this input */
out_be32(&dev->base->fer,
in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
if (!--dev->users) {
/* Free everything if this is the last user */
ocp_set_drvdata(ocpdev, NULL);
iounmap(dev->base);
kfree(dev);
}
}
int __zmii_get_regs_len(struct ocp_device *ocpdev)
{
return sizeof(struct emac_ethtool_regs_subhdr) +
sizeof(struct zmii_regs);
}
void *zmii_dump_regs(struct ocp_device *ocpdev, void *buf)
{
struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
struct emac_ethtool_regs_subhdr *hdr = buf;
struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1);
hdr->version = 0;
hdr->index = ocpdev->def->index;
memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));
return regs + 1;
}
