260 lines
6.8 KiB
C
260 lines
6.8 KiB
C
/*
|
|
* Amlogic Meson GXL Internal PHY Driver
|
|
*
|
|
* Copyright (C) 2015 Amlogic, Inc. All rights reserved.
|
|
* Copyright (C) 2016 BayLibre, SAS. All rights reserved.
|
|
* Author: Neil Armstrong <narmstrong@baylibre.com>
|
|
*
|
|
* 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.
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mii.h>
|
|
#include <linux/ethtool.h>
|
|
#include <linux/phy.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/bitfield.h>
|
|
|
|
#define TSTCNTL 20
|
|
#define TSTCNTL_READ BIT(15)
|
|
#define TSTCNTL_WRITE BIT(14)
|
|
#define TSTCNTL_REG_BANK_SEL GENMASK(12, 11)
|
|
#define TSTCNTL_TEST_MODE BIT(10)
|
|
#define TSTCNTL_READ_ADDRESS GENMASK(9, 5)
|
|
#define TSTCNTL_WRITE_ADDRESS GENMASK(4, 0)
|
|
#define TSTREAD1 21
|
|
#define TSTWRITE 23
|
|
#define INTSRC_FLAG 29
|
|
#define INTSRC_ANEG_PR BIT(1)
|
|
#define INTSRC_PARALLEL_FAULT BIT(2)
|
|
#define INTSRC_ANEG_LP_ACK BIT(3)
|
|
#define INTSRC_LINK_DOWN BIT(4)
|
|
#define INTSRC_REMOTE_FAULT BIT(5)
|
|
#define INTSRC_ANEG_COMPLETE BIT(6)
|
|
#define INTSRC_MASK 30
|
|
|
|
#define BANK_ANALOG_DSP 0
|
|
#define BANK_WOL 1
|
|
#define BANK_BIST 3
|
|
|
|
/* WOL Registers */
|
|
#define LPI_STATUS 0xc
|
|
#define LPI_STATUS_RSV12 BIT(12)
|
|
|
|
/* BIST Registers */
|
|
#define FR_PLL_CONTROL 0x1b
|
|
#define FR_PLL_DIV0 0x1c
|
|
#define FR_PLL_DIV1 0x1d
|
|
|
|
static int meson_gxl_open_banks(struct phy_device *phydev)
|
|
{
|
|
int ret;
|
|
|
|
/* Enable Analog and DSP register Bank access by
|
|
* toggling TSTCNTL_TEST_MODE bit in the TSTCNTL register
|
|
*/
|
|
ret = phy_write(phydev, TSTCNTL, 0);
|
|
if (ret)
|
|
return ret;
|
|
ret = phy_write(phydev, TSTCNTL, TSTCNTL_TEST_MODE);
|
|
if (ret)
|
|
return ret;
|
|
ret = phy_write(phydev, TSTCNTL, 0);
|
|
if (ret)
|
|
return ret;
|
|
return phy_write(phydev, TSTCNTL, TSTCNTL_TEST_MODE);
|
|
}
|
|
|
|
static void meson_gxl_close_banks(struct phy_device *phydev)
|
|
{
|
|
phy_write(phydev, TSTCNTL, 0);
|
|
}
|
|
|
|
static int meson_gxl_read_reg(struct phy_device *phydev,
|
|
unsigned int bank, unsigned int reg)
|
|
{
|
|
int ret;
|
|
|
|
ret = meson_gxl_open_banks(phydev);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = phy_write(phydev, TSTCNTL, TSTCNTL_READ |
|
|
FIELD_PREP(TSTCNTL_REG_BANK_SEL, bank) |
|
|
TSTCNTL_TEST_MODE |
|
|
FIELD_PREP(TSTCNTL_READ_ADDRESS, reg));
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = phy_read(phydev, TSTREAD1);
|
|
out:
|
|
/* Close the bank access on our way out */
|
|
meson_gxl_close_banks(phydev);
|
|
return ret;
|
|
}
|
|
|
|
static int meson_gxl_write_reg(struct phy_device *phydev,
|
|
unsigned int bank, unsigned int reg,
|
|
uint16_t value)
|
|
{
|
|
int ret;
|
|
|
|
ret = meson_gxl_open_banks(phydev);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = phy_write(phydev, TSTWRITE, value);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = phy_write(phydev, TSTCNTL, TSTCNTL_WRITE |
|
|
FIELD_PREP(TSTCNTL_REG_BANK_SEL, bank) |
|
|
TSTCNTL_TEST_MODE |
|
|
FIELD_PREP(TSTCNTL_WRITE_ADDRESS, reg));
|
|
|
|
out:
|
|
/* Close the bank access on our way out */
|
|
meson_gxl_close_banks(phydev);
|
|
return ret;
|
|
}
|
|
|
|
static int meson_gxl_config_init(struct phy_device *phydev)
|
|
{
|
|
int ret;
|
|
|
|
/* Enable fractional PLL */
|
|
ret = meson_gxl_write_reg(phydev, BANK_BIST, FR_PLL_CONTROL, 0x5);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Program fraction FR_PLL_DIV1 */
|
|
ret = meson_gxl_write_reg(phydev, BANK_BIST, FR_PLL_DIV1, 0x029a);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Program fraction FR_PLL_DIV1 */
|
|
ret = meson_gxl_write_reg(phydev, BANK_BIST, FR_PLL_DIV0, 0xaaaa);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return genphy_config_init(phydev);
|
|
}
|
|
|
|
/* This function is provided to cope with the possible failures of this phy
|
|
* during aneg process. When aneg fails, the PHY reports that aneg is done
|
|
* but the value found in MII_LPA is wrong:
|
|
* - Early failures: MII_LPA is just 0x0001. if MII_EXPANSION reports that
|
|
* the link partner (LP) supports aneg but the LP never acked our base
|
|
* code word, it is likely that we never sent it to begin with.
|
|
* - Late failures: MII_LPA is filled with a value which seems to make sense
|
|
* but it actually is not what the LP is advertising. It seems that we
|
|
* can detect this using a magic bit in the WOL bank (reg 12 - bit 12).
|
|
* If this particular bit is not set when aneg is reported being done,
|
|
* it means MII_LPA is likely to be wrong.
|
|
*
|
|
* In both case, forcing a restart of the aneg process solve the problem.
|
|
* When this failure happens, the first retry is usually successful but,
|
|
* in some cases, it may take up to 6 retries to get a decent result
|
|
*/
|
|
static int meson_gxl_read_status(struct phy_device *phydev)
|
|
{
|
|
int ret, wol, lpa, exp;
|
|
|
|
if (phydev->autoneg == AUTONEG_ENABLE) {
|
|
ret = genphy_aneg_done(phydev);
|
|
if (ret < 0)
|
|
return ret;
|
|
else if (!ret)
|
|
goto read_status_continue;
|
|
|
|
/* Aneg is done, let's check everything is fine */
|
|
wol = meson_gxl_read_reg(phydev, BANK_WOL, LPI_STATUS);
|
|
if (wol < 0)
|
|
return wol;
|
|
|
|
lpa = phy_read(phydev, MII_LPA);
|
|
if (lpa < 0)
|
|
return lpa;
|
|
|
|
exp = phy_read(phydev, MII_EXPANSION);
|
|
if (exp < 0)
|
|
return exp;
|
|
|
|
if (!(wol & LPI_STATUS_RSV12) ||
|
|
((exp & EXPANSION_NWAY) && !(lpa & LPA_LPACK))) {
|
|
/* Looks like aneg failed after all */
|
|
phydev_dbg(phydev, "LPA corruption - aneg restart\n");
|
|
return genphy_restart_aneg(phydev);
|
|
}
|
|
}
|
|
|
|
read_status_continue:
|
|
return genphy_read_status(phydev);
|
|
}
|
|
|
|
static int meson_gxl_ack_interrupt(struct phy_device *phydev)
|
|
{
|
|
int ret = phy_read(phydev, INTSRC_FLAG);
|
|
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
static int meson_gxl_config_intr(struct phy_device *phydev)
|
|
{
|
|
u16 val;
|
|
|
|
if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
|
|
val = INTSRC_ANEG_PR
|
|
| INTSRC_PARALLEL_FAULT
|
|
| INTSRC_ANEG_LP_ACK
|
|
| INTSRC_LINK_DOWN
|
|
| INTSRC_REMOTE_FAULT
|
|
| INTSRC_ANEG_COMPLETE;
|
|
} else {
|
|
val = 0;
|
|
}
|
|
|
|
return phy_write(phydev, INTSRC_MASK, val);
|
|
}
|
|
|
|
static struct phy_driver meson_gxl_phy[] = {
|
|
{
|
|
.phy_id = 0x01814400,
|
|
.phy_id_mask = 0xfffffff0,
|
|
.name = "Meson GXL Internal PHY",
|
|
.features = PHY_BASIC_FEATURES,
|
|
.flags = PHY_IS_INTERNAL,
|
|
.config_init = meson_gxl_config_init,
|
|
.aneg_done = genphy_aneg_done,
|
|
.read_status = meson_gxl_read_status,
|
|
.ack_interrupt = meson_gxl_ack_interrupt,
|
|
.config_intr = meson_gxl_config_intr,
|
|
.suspend = genphy_suspend,
|
|
.resume = genphy_resume,
|
|
},
|
|
};
|
|
|
|
static struct mdio_device_id __maybe_unused meson_gxl_tbl[] = {
|
|
{ 0x01814400, 0xfffffff0 },
|
|
{ }
|
|
};
|
|
|
|
module_phy_driver(meson_gxl_phy);
|
|
|
|
MODULE_DEVICE_TABLE(mdio, meson_gxl_tbl);
|
|
|
|
MODULE_DESCRIPTION("Amlogic Meson GXL Internal PHY driver");
|
|
MODULE_AUTHOR("Baoqi wang");
|
|
MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
|
|
MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
|
|
MODULE_LICENSE("GPL");
|