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/* Copyright Altera Corporation (C) 2016. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Author: Tien Hock Loh <thloh@altera.com>
*/
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_net.h>
#include <linux/phy.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/stmmac.h>
#include "stmmac.h"
#include "stmmac_platform.h"
#include "altr_tse_pcs.h"
#define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII 0
#define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII BIT(1)
#define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RMII BIT(2)
#define SYSMGR_EMACGRP_CTRL_PHYSEL_WIDTH 2
#define SYSMGR_EMACGRP_CTRL_PHYSEL_MASK GENMASK(1, 0)
#define TSE_PCS_CONTROL_AN_EN_MASK BIT(12)
#define TSE_PCS_CONTROL_REG 0x00
#define TSE_PCS_CONTROL_RESTART_AN_MASK BIT(9)
#define TSE_PCS_CTRL_AUTONEG_SGMII 0x1140
#define TSE_PCS_IF_MODE_REG 0x28
#define TSE_PCS_LINK_TIMER_0_REG 0x24
#define TSE_PCS_LINK_TIMER_1_REG 0x26
#define TSE_PCS_SIZE 0x40
#define TSE_PCS_STATUS_AN_COMPLETED_MASK BIT(5)
#define TSE_PCS_STATUS_LINK_MASK 0x0004
#define TSE_PCS_STATUS_REG 0x02
#define TSE_PCS_SGMII_SPEED_1000 BIT(3)
#define TSE_PCS_SGMII_SPEED_100 BIT(2)
#define TSE_PCS_SGMII_SPEED_10 0x0
#define TSE_PCS_SW_RST_MASK 0x8000
#define TSE_PCS_PARTNER_ABILITY_REG 0x0A
#define TSE_PCS_PARTNER_DUPLEX_FULL 0x1000
#define TSE_PCS_PARTNER_DUPLEX_HALF 0x0000
#define TSE_PCS_PARTNER_DUPLEX_MASK 0x1000
#define TSE_PCS_PARTNER_SPEED_MASK GENMASK(11, 10)
#define TSE_PCS_PARTNER_SPEED_1000 BIT(11)
#define TSE_PCS_PARTNER_SPEED_100 BIT(10)
#define TSE_PCS_PARTNER_SPEED_10 0x0000
#define TSE_PCS_PARTNER_SPEED_1000 BIT(11)
#define TSE_PCS_PARTNER_SPEED_100 BIT(10)
#define TSE_PCS_PARTNER_SPEED_10 0x0000
#define TSE_PCS_SGMII_SPEED_MASK GENMASK(3, 2)
#define TSE_PCS_SGMII_LINK_TIMER_0 0x0D40
#define TSE_PCS_SGMII_LINK_TIMER_1 0x0003
#define TSE_PCS_SW_RESET_TIMEOUT 100
#define TSE_PCS_USE_SGMII_AN_MASK BIT(1)
#define TSE_PCS_USE_SGMII_ENA BIT(0)
#define TSE_PCS_IF_USE_SGMII 0x03
#define SGMII_ADAPTER_CTRL_REG 0x00
#define SGMII_ADAPTER_DISABLE 0x0001
#define SGMII_ADAPTER_ENABLE 0x0000
#define AUTONEGO_LINK_TIMER 20
static int tse_pcs_reset(void __iomem *base, struct tse_pcs *pcs)
{
int counter = 0;
u16 val;
val = readw(base + TSE_PCS_CONTROL_REG);
val |= TSE_PCS_SW_RST_MASK;
writew(val, base + TSE_PCS_CONTROL_REG);
while (counter < TSE_PCS_SW_RESET_TIMEOUT) {
val = readw(base + TSE_PCS_CONTROL_REG);
val &= TSE_PCS_SW_RST_MASK;
if (val == 0)
break;
counter++;
udelay(1);
}
if (counter >= TSE_PCS_SW_RESET_TIMEOUT) {
dev_err(pcs->dev, "PCS could not get out of sw reset\n");
return -ETIMEDOUT;
}
return 0;
}
int tse_pcs_init(void __iomem *base, struct tse_pcs *pcs)
{
int ret = 0;
writew(TSE_PCS_IF_USE_SGMII, base + TSE_PCS_IF_MODE_REG);
writew(TSE_PCS_CTRL_AUTONEG_SGMII, base + TSE_PCS_CONTROL_REG);
writew(TSE_PCS_SGMII_LINK_TIMER_0, base + TSE_PCS_LINK_TIMER_0_REG);
writew(TSE_PCS_SGMII_LINK_TIMER_1, base + TSE_PCS_LINK_TIMER_1_REG);
ret = tse_pcs_reset(base, pcs);
if (ret == 0)
writew(SGMII_ADAPTER_ENABLE,
pcs->sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
return ret;
}
static void pcs_link_timer_callback(struct tse_pcs *pcs)
{
u16 val = 0;
void __iomem *tse_pcs_base = pcs->tse_pcs_base;
void __iomem *sgmii_adapter_base = pcs->sgmii_adapter_base;
val = readw(tse_pcs_base + TSE_PCS_STATUS_REG);
val &= TSE_PCS_STATUS_LINK_MASK;
if (val != 0) {
dev_dbg(pcs->dev, "Adapter: Link is established\n");
writew(SGMII_ADAPTER_ENABLE,
sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
} else {
mod_timer(&pcs->aneg_link_timer, jiffies +
msecs_to_jiffies(AUTONEGO_LINK_TIMER));
}
}
static void auto_nego_timer_callback(struct tse_pcs *pcs)
{
u16 val = 0;
u16 speed = 0;
u16 duplex = 0;
void __iomem *tse_pcs_base = pcs->tse_pcs_base;
void __iomem *sgmii_adapter_base = pcs->sgmii_adapter_base;
val = readw(tse_pcs_base + TSE_PCS_STATUS_REG);
val &= TSE_PCS_STATUS_AN_COMPLETED_MASK;
if (val != 0) {
dev_dbg(pcs->dev, "Adapter: Auto Negotiation is completed\n");
val = readw(tse_pcs_base + TSE_PCS_PARTNER_ABILITY_REG);
speed = val & TSE_PCS_PARTNER_SPEED_MASK;
duplex = val & TSE_PCS_PARTNER_DUPLEX_MASK;
if (speed == TSE_PCS_PARTNER_SPEED_10 &&
duplex == TSE_PCS_PARTNER_DUPLEX_FULL)
dev_dbg(pcs->dev,
"Adapter: Link Partner is Up - 10/Full\n");
else if (speed == TSE_PCS_PARTNER_SPEED_100 &&
duplex == TSE_PCS_PARTNER_DUPLEX_FULL)
dev_dbg(pcs->dev,
"Adapter: Link Partner is Up - 100/Full\n");
else if (speed == TSE_PCS_PARTNER_SPEED_1000 &&
duplex == TSE_PCS_PARTNER_DUPLEX_FULL)
dev_dbg(pcs->dev,
"Adapter: Link Partner is Up - 1000/Full\n");
else if (speed == TSE_PCS_PARTNER_SPEED_10 &&
duplex == TSE_PCS_PARTNER_DUPLEX_HALF)
dev_err(pcs->dev,
"Adapter does not support Half Duplex\n");
else if (speed == TSE_PCS_PARTNER_SPEED_100 &&
duplex == TSE_PCS_PARTNER_DUPLEX_HALF)
dev_err(pcs->dev,
"Adapter does not support Half Duplex\n");
else if (speed == TSE_PCS_PARTNER_SPEED_1000 &&
duplex == TSE_PCS_PARTNER_DUPLEX_HALF)
dev_err(pcs->dev,
"Adapter does not support Half Duplex\n");
else
dev_err(pcs->dev,
"Adapter: Invalid Partner Speed and Duplex\n");
if (duplex == TSE_PCS_PARTNER_DUPLEX_FULL &&
(speed == TSE_PCS_PARTNER_SPEED_10 ||
speed == TSE_PCS_PARTNER_SPEED_100 ||
speed == TSE_PCS_PARTNER_SPEED_1000))
writew(SGMII_ADAPTER_ENABLE,
sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
} else {
val = readw(tse_pcs_base + TSE_PCS_CONTROL_REG);
val |= TSE_PCS_CONTROL_RESTART_AN_MASK;
writew(val, tse_pcs_base + TSE_PCS_CONTROL_REG);
tse_pcs_reset(tse_pcs_base, pcs);
mod_timer(&pcs->aneg_link_timer, jiffies +
msecs_to_jiffies(AUTONEGO_LINK_TIMER));
}
}
static void aneg_link_timer_callback(struct timer_list *t)
{
struct tse_pcs *pcs = from_timer(pcs, t, aneg_link_timer);
if (pcs->autoneg == AUTONEG_ENABLE)
auto_nego_timer_callback(pcs);
else if (pcs->autoneg == AUTONEG_DISABLE)
pcs_link_timer_callback(pcs);
}
void tse_pcs_fix_mac_speed(struct tse_pcs *pcs, struct phy_device *phy_dev,
unsigned int speed)
{
void __iomem *tse_pcs_base = pcs->tse_pcs_base;
void __iomem *sgmii_adapter_base = pcs->sgmii_adapter_base;
u32 val;
writew(SGMII_ADAPTER_ENABLE,
sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
pcs->autoneg = phy_dev->autoneg;
if (phy_dev->autoneg == AUTONEG_ENABLE) {
val = readw(tse_pcs_base + TSE_PCS_CONTROL_REG);
val |= TSE_PCS_CONTROL_AN_EN_MASK;
writew(val, tse_pcs_base + TSE_PCS_CONTROL_REG);
val = readw(tse_pcs_base + TSE_PCS_IF_MODE_REG);
val |= TSE_PCS_USE_SGMII_AN_MASK;
writew(val, tse_pcs_base + TSE_PCS_IF_MODE_REG);
val = readw(tse_pcs_base + TSE_PCS_CONTROL_REG);
val |= TSE_PCS_CONTROL_RESTART_AN_MASK;
tse_pcs_reset(tse_pcs_base, pcs);
timer_setup(&pcs->aneg_link_timer, aneg_link_timer_callback,
0);
mod_timer(&pcs->aneg_link_timer, jiffies +
msecs_to_jiffies(AUTONEGO_LINK_TIMER));
} else if (phy_dev->autoneg == AUTONEG_DISABLE) {
val = readw(tse_pcs_base + TSE_PCS_CONTROL_REG);
val &= ~TSE_PCS_CONTROL_AN_EN_MASK;
writew(val, tse_pcs_base + TSE_PCS_CONTROL_REG);
val = readw(tse_pcs_base + TSE_PCS_IF_MODE_REG);
val &= ~TSE_PCS_USE_SGMII_AN_MASK;
writew(val, tse_pcs_base + TSE_PCS_IF_MODE_REG);
val = readw(tse_pcs_base + TSE_PCS_IF_MODE_REG);
val &= ~TSE_PCS_SGMII_SPEED_MASK;
switch (speed) {
case 1000:
val |= TSE_PCS_SGMII_SPEED_1000;
break;
case 100:
val |= TSE_PCS_SGMII_SPEED_100;
break;
case 10:
val |= TSE_PCS_SGMII_SPEED_10;
break;
default:
return;
}
writew(val, tse_pcs_base + TSE_PCS_IF_MODE_REG);
tse_pcs_reset(tse_pcs_base, pcs);
timer_setup(&pcs->aneg_link_timer, aneg_link_timer_callback,
0);
mod_timer(&pcs->aneg_link_timer, jiffies +
msecs_to_jiffies(AUTONEGO_LINK_TIMER));
}
}
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