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/*
* drivers/net/ibm_emac/ibm_emac_rgmii.c
*
* Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support.
*
* 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/kernel.h>
#include <linux/ethtool.h>
#include <asm/io.h>
#include "ibm_emac_core.h"
#include "ibm_emac_debug.h"
/* 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))
/* 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_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_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_RTBI:
return RGMII_FER_RTBI(input);
default:
BUG();
}
}
static int __init rgmii_init(struct ocp_device *ocpdev, int input, int mode)
{
struct ibm_ocp_rgmii *dev = ocp_get_drvdata(ocpdev);
struct rgmii_regs *p;
RGMII_DBG("%d: init(%d, %d)" NL, ocpdev->def->index, input, mode);
if (!dev) {
dev = kzalloc(sizeof(struct ibm_ocp_rgmii), GFP_KERNEL);
if (!dev) {
printk(KERN_ERR
"rgmii%d: couldn't allocate device structure!\n",
ocpdev->def->index);
return -ENOMEM;
}
p = (struct rgmii_regs *)ioremap(ocpdev->def->paddr,
sizeof(struct rgmii_regs));
if (!p) {
printk(KERN_ERR
"rgmii%d: could not ioremap device registers!\n",
ocpdev->def->index);
kfree(dev);
return -ENOMEM;
}
dev->base = p;
ocp_set_drvdata(ocpdev, dev);
/* Disable all inputs by default */
out_be32(&p->fer, 0);
} else
p = dev->base;
/* Enable this input */
out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
printk(KERN_NOTICE "rgmii%d: input %d in %s mode\n",
ocpdev->def->index, input, rgmii_mode_name(mode));
++dev->users;
return 0;
}
int __init rgmii_attach(void *emac)
{
struct ocp_enet_private *dev = emac;
struct ocp_func_emac_data *emacdata = dev->def->additions;
/* Check if we need to attach to a RGMII */
if (emacdata->rgmii_idx >= 0 && rgmii_valid_mode(emacdata->phy_mode)) {
dev->rgmii_input = emacdata->rgmii_mux;
dev->rgmii_dev =
ocp_find_device(OCP_VENDOR_IBM, OCP_FUNC_RGMII,
emacdata->rgmii_idx);
if (!dev->rgmii_dev) {
printk(KERN_ERR "emac%d: unknown rgmii%d!\n",
dev->def->index, emacdata->rgmii_idx);
return -ENODEV;
}
if (rgmii_init
(dev->rgmii_dev, dev->rgmii_input, emacdata->phy_mode)) {
printk(KERN_ERR
"emac%d: rgmii%d initialization failed!\n",
dev->def->index, emacdata->rgmii_idx);
return -ENODEV;
}
}
return 0;
}
void rgmii_set_speed(struct ocp_device *ocpdev, int input, int speed)
{
struct ibm_ocp_rgmii *dev = ocp_get_drvdata(ocpdev);
u32 ssr = in_be32(&dev->base->ssr) & ~RGMII_SSR_MASK(input);
RGMII_DBG("%d: speed(%d, %d)" NL, ocpdev->def->index, input, speed);
if (speed == SPEED_1000)
ssr |= RGMII_SSR_1000(input);
else if (speed == SPEED_100)
ssr |= RGMII_SSR_100(input);
out_be32(&dev->base->ssr, ssr);
}
void __rgmii_fini(struct ocp_device *ocpdev, int input)
{
struct ibm_ocp_rgmii *dev = ocp_get_drvdata(ocpdev);
BUG_ON(!dev || dev->users == 0);
RGMII_DBG("%d: fini(%d)" NL, ocpdev->def->index, input);
/* Disable this input */
out_be32(&dev->base->fer,
in_be32(&dev->base->fer) & ~RGMII_FER_MASK(input));
if (!--dev->users) {
/* Free everything if this is the last user */
ocp_set_drvdata(ocpdev, NULL);
iounmap((void *)dev->base);
kfree(dev);
}
}
int __rgmii_get_regs_len(struct ocp_device *ocpdev)
{
return sizeof(struct emac_ethtool_regs_subhdr) +
sizeof(struct rgmii_regs);
}
void *rgmii_dump_regs(struct ocp_device *ocpdev, void *buf)
{
struct ibm_ocp_rgmii *dev = ocp_get_drvdata(ocpdev);
struct emac_ethtool_regs_subhdr *hdr = buf;
struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
hdr->version = 0;
hdr->index = ocpdev->def->index;
memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
return regs + 1;
}
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