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// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for Motorcomm PHYs
*
* Author: Peter Geis <pgwipeout@gmail.com>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/phy.h>
#define PHY_ID_YT8511 0x0000010a
#define YT8511_PAGE_SELECT 0x1e
#define YT8511_PAGE 0x1f
#define YT8511_EXT_CLK_GATE 0x0c
#define YT8511_EXT_DELAY_DRIVE 0x0d
#define YT8511_EXT_SLEEP_CTRL 0x27
/* 2b00 25m from pll
* 2b01 25m from xtl *default*
* 2b10 62.m from pll
* 2b11 125m from pll
*/
#define YT8511_CLK_125M (BIT(2) | BIT(1))
#define YT8511_PLLON_SLP BIT(14)
/* RX Delay enabled = 1.8ns 1000T, 8ns 10/100T */
#define YT8511_DELAY_RX BIT(0)
/* TX Gig-E Delay is bits 7:4, default 0x5
* TX Fast-E Delay is bits 15:12, default 0xf
* Delay = 150ps * N - 250ps
* On = 2000ps, off = 50ps
*/
#define YT8511_DELAY_GE_TX_EN (0xf << 4)
#define YT8511_DELAY_GE_TX_DIS (0x2 << 4)
#define YT8511_DELAY_FE_TX_EN (0xf << 12)
#define YT8511_DELAY_FE_TX_DIS (0x2 << 12)
static int yt8511_read_page(struct phy_device *phydev)
{
return __phy_read(phydev, YT8511_PAGE_SELECT);
};
static int yt8511_write_page(struct phy_device *phydev, int page)
{
return __phy_write(phydev, YT8511_PAGE_SELECT, page);
};
static int yt8511_config_init(struct phy_device *phydev)
{
int oldpage, ret = 0;
unsigned int ge, fe;
oldpage = phy_select_page(phydev, YT8511_EXT_CLK_GATE);
if (oldpage < 0)
goto err_restore_page;
/* set rgmii delay mode */
switch (phydev->interface) {
case PHY_INTERFACE_MODE_RGMII:
ge = YT8511_DELAY_GE_TX_DIS;
fe = YT8511_DELAY_FE_TX_DIS;
break;
case PHY_INTERFACE_MODE_RGMII_RXID:
ge = YT8511_DELAY_RX | YT8511_DELAY_GE_TX_DIS;
fe = YT8511_DELAY_FE_TX_DIS;
break;
case PHY_INTERFACE_MODE_RGMII_TXID:
ge = YT8511_DELAY_GE_TX_EN;
fe = YT8511_DELAY_FE_TX_EN;
break;
case PHY_INTERFACE_MODE_RGMII_ID:
ge = YT8511_DELAY_RX | YT8511_DELAY_GE_TX_EN;
fe = YT8511_DELAY_FE_TX_EN;
break;
default: /* do not support other modes */
ret = -EOPNOTSUPP;
goto err_restore_page;
}
ret = __phy_modify(phydev, YT8511_PAGE, (YT8511_DELAY_RX | YT8511_DELAY_GE_TX_EN), ge);
if (ret < 0)
goto err_restore_page;
/* set clock mode to 125mhz */
ret = __phy_modify(phydev, YT8511_PAGE, 0, YT8511_CLK_125M);
if (ret < 0)
goto err_restore_page;
/* fast ethernet delay is in a separate page */
ret = __phy_write(phydev, YT8511_PAGE_SELECT, YT8511_EXT_DELAY_DRIVE);
if (ret < 0)
goto err_restore_page;
ret = __phy_modify(phydev, YT8511_PAGE, YT8511_DELAY_FE_TX_EN, fe);
if (ret < 0)
goto err_restore_page;
/* leave pll enabled in sleep */
ret = __phy_write(phydev, YT8511_PAGE_SELECT, YT8511_EXT_SLEEP_CTRL);
if (ret < 0)
goto err_restore_page;
ret = __phy_modify(phydev, YT8511_PAGE, 0, YT8511_PLLON_SLP);
if (ret < 0)
goto err_restore_page;
err_restore_page:
return phy_restore_page(phydev, oldpage, ret);
}
static struct phy_driver motorcomm_phy_drvs[] = {
{
PHY_ID_MATCH_EXACT(PHY_ID_YT8511),
.name = "YT8511 Gigabit Ethernet",
.config_init = yt8511_config_init,
.suspend = genphy_suspend,
.resume = genphy_resume,
.read_page = yt8511_read_page,
.write_page = yt8511_write_page,
},
};
module_phy_driver(motorcomm_phy_drvs);
MODULE_DESCRIPTION("Motorcomm PHY driver");
MODULE_AUTHOR("Peter Geis");
MODULE_LICENSE("GPL");
static const struct mdio_device_id __maybe_unused motorcomm_tbl[] = {
{ PHY_ID_MATCH_EXACT(PHY_ID_YT8511) },
{ /* sentinal */ }
};
MODULE_DEVICE_TABLE(mdio, motorcomm_tbl);
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