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original_kernel/drivers/phy/mediatek/phy-mtk-xfi-tphy.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* MediaTek 10GE SerDes XFI T-PHY driver
*
* Copyright (c) 2024 Daniel Golle <daniel@makrotopia.org>
* Bc-bocun Chen <bc-bocun.chen@mediatek.com>
* based on mtk_usxgmii.c and mtk_sgmii.c found in MediaTek's SDK (GPL-2.0)
* Copyright (c) 2022 MediaTek Inc.
* Author: Henry Yen <henry.yen@mediatek.com>
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/reset.h>
#include <linux/phy.h>
#include <linux/phy/phy.h>
#include "phy-mtk-io.h"
#define MTK_XFI_TPHY_NUM_CLOCKS 2
#define REG_DIG_GLB_70 0x0070
#define XTP_PCS_RX_EQ_IN_PROGRESS(x) FIELD_PREP(GENMASK(25, 24), (x))
#define XTP_PCS_MODE_MASK GENMASK(17, 16)
#define XTP_PCS_MODE(x) FIELD_PREP(GENMASK(17, 16), (x))
#define XTP_PCS_RST_B BIT(15)
#define XTP_FRC_PCS_RST_B BIT(14)
#define XTP_PCS_PWD_SYNC_MASK GENMASK(13, 12)
#define XTP_PCS_PWD_SYNC(x) FIELD_PREP(XTP_PCS_PWD_SYNC_MASK, (x))
#define XTP_PCS_PWD_ASYNC_MASK GENMASK(11, 10)
#define XTP_PCS_PWD_ASYNC(x) FIELD_PREP(XTP_PCS_PWD_ASYNC_MASK, (x))
#define XTP_FRC_PCS_PWD_ASYNC BIT(8)
#define XTP_PCS_UPDT BIT(4)
#define XTP_PCS_IN_FR_RG BIT(0)
#define REG_DIG_GLB_F4 0x00f4
#define XFI_DPHY_PCS_SEL BIT(0)
#define XFI_DPHY_PCS_SEL_SGMII FIELD_PREP(XFI_DPHY_PCS_SEL, 1)
#define XFI_DPHY_PCS_SEL_USXGMII FIELD_PREP(XFI_DPHY_PCS_SEL, 0)
#define XFI_DPHY_AD_SGDT_FRC_EN BIT(5)
#define REG_DIG_LN_TRX_40 0x3040
#define XTP_LN_FRC_TX_DATA_EN BIT(29)
#define XTP_LN_TX_DATA_EN BIT(28)
#define REG_DIG_LN_TRX_B0 0x30b0
#define XTP_LN_FRC_TX_MACCK_EN BIT(5)
#define XTP_LN_TX_MACCK_EN BIT(4)
#define REG_ANA_GLB_D0 0x90d0
#define XTP_GLB_USXGMII_SEL_MASK GENMASK(3, 1)
#define XTP_GLB_USXGMII_SEL(x) FIELD_PREP(GENMASK(3, 1), (x))
#define XTP_GLB_USXGMII_EN BIT(0)
/**
* struct mtk_xfi_tphy - run-time data of the XFI phy instance
* @base: IO memory area to access phy registers.
* @dev: Kernel device used to output prefixed debug info.
* @reset: Reset control corresponding to the phy instance.
* @clocks: All clocks required for the phy to operate.
* @da_war: Enables work-around for 10GBase-R mode.
*/
struct mtk_xfi_tphy {
void __iomem *base;
struct device *dev;
struct reset_control *reset;
struct clk_bulk_data clocks[MTK_XFI_TPHY_NUM_CLOCKS];
bool da_war;
};
/**
* mtk_xfi_tphy_setup() - Setup phy for specified interface mode.
* @xfi_tphy: XFI phy instance.
* @interface: Ethernet interface mode
*
* The setup function is the condensed result of combining the 5 functions which
* setup the phy in MediaTek's GPL licensed public SDK sources. They can be found
* in mtk_sgmii.c[1] as well as mtk_usxgmii.c[2].
*
* Many magic values have been replaced by register and bit definitions, however,
* that has not been possible in all cases. While the vendor driver uses a
* sequence of 32-bit writes, here we try to only modify the actually required
* bits.
*
* [1]: https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/b72d6cba92bf9e29fb035c03052fa1e86664a25b/21.02/files/target/linux/mediatek/files-5.4/drivers/net/ethernet/mediatek/mtk_sgmii.c
*
* [2]: https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/dec96a1d9b82cdcda4a56453fd0b453d4cab4b85/21.02/files/target/linux/mediatek/files-5.4/drivers/net/ethernet/mediatek/mtk_eth_soc.c
*/
static void mtk_xfi_tphy_setup(struct mtk_xfi_tphy *xfi_tphy,
phy_interface_t interface)
{
bool is_1g, is_2p5g, is_5g, is_10g, da_war, use_lynxi_pcs;
/* shorthands for specific clock speeds depending on interface mode */
is_1g = interface == PHY_INTERFACE_MODE_1000BASEX ||
interface == PHY_INTERFACE_MODE_SGMII;
is_2p5g = interface == PHY_INTERFACE_MODE_2500BASEX;
is_5g = interface == PHY_INTERFACE_MODE_5GBASER;
is_10g = interface == PHY_INTERFACE_MODE_10GBASER ||
interface == PHY_INTERFACE_MODE_USXGMII;
/* Is overriding 10GBase-R tuning value required? */
da_war = xfi_tphy->da_war && (interface == PHY_INTERFACE_MODE_10GBASER);
/* configure input mux to either
* - USXGMII PCS (64b/66b coding) for 5G/10G
* - LynxI PCS (8b/10b coding) for 1G/2.5G
*/
use_lynxi_pcs = is_1g || is_2p5g;
dev_dbg(xfi_tphy->dev, "setting up for mode %s\n", phy_modes(interface));
/* Setup PLL setting */
mtk_phy_update_bits(xfi_tphy->base + 0x9024, 0x100000, is_10g ? 0x0 : 0x100000);
mtk_phy_update_bits(xfi_tphy->base + 0x2020, 0x202000, is_5g ? 0x202000 : 0x0);
mtk_phy_update_bits(xfi_tphy->base + 0x2030, 0x500, is_1g ? 0x0 : 0x500);
mtk_phy_update_bits(xfi_tphy->base + 0x2034, 0xa00, is_1g ? 0x0 : 0xa00);
mtk_phy_update_bits(xfi_tphy->base + 0x2040, 0x340000, is_1g ? 0x200000 : 0x140000);
/* Setup RXFE BW setting */
mtk_phy_update_bits(xfi_tphy->base + 0x50f0, 0xc10, is_1g ? 0x410 : is_5g ? 0x800 : 0x400);
mtk_phy_update_bits(xfi_tphy->base + 0x50e0, 0x4000, is_5g ? 0x0 : 0x4000);
/* Setup RX CDR setting */
mtk_phy_update_bits(xfi_tphy->base + 0x506c, 0x30000, is_5g ? 0x0 : 0x30000);
mtk_phy_update_bits(xfi_tphy->base + 0x5070, 0x670000, is_5g ? 0x620000 : 0x50000);
mtk_phy_update_bits(xfi_tphy->base + 0x5074, 0x180000, is_5g ? 0x180000 : 0x0);
mtk_phy_update_bits(xfi_tphy->base + 0x5078, 0xf000400, is_5g ? 0x8000000 :
0x7000400);
mtk_phy_update_bits(xfi_tphy->base + 0x507c, 0x5000500, is_5g ? 0x4000400 :
0x1000100);
mtk_phy_update_bits(xfi_tphy->base + 0x5080, 0x1410, is_1g ? 0x400 : is_5g ? 0x1010 : 0x0);
mtk_phy_update_bits(xfi_tphy->base + 0x5084, 0x30300, is_1g ? 0x30300 :
is_5g ? 0x30100 :
0x100);
mtk_phy_update_bits(xfi_tphy->base + 0x5088, 0x60200, is_1g ? 0x20200 :
is_5g ? 0x40000 :
0x20000);
/* Setting RXFE adaptation range setting */
mtk_phy_update_bits(xfi_tphy->base + 0x50e4, 0xc0000, is_5g ? 0x0 : 0xc0000);
mtk_phy_update_bits(xfi_tphy->base + 0x50e8, 0x40000, is_5g ? 0x0 : 0x40000);
mtk_phy_update_bits(xfi_tphy->base + 0x50ec, 0xa00, is_1g ? 0x200 : 0x800);
mtk_phy_update_bits(xfi_tphy->base + 0x50a8, 0xee0000, is_5g ? 0x800000 :
0x6e0000);
mtk_phy_update_bits(xfi_tphy->base + 0x6004, 0x190000, is_5g ? 0x0 : 0x190000);
if (is_10g)
writel(0x01423342, xfi_tphy->base + 0x00f8);
else if (is_5g)
writel(0x00a132a1, xfi_tphy->base + 0x00f8);
else if (is_2p5g)
writel(0x009c329c, xfi_tphy->base + 0x00f8);
else
writel(0x00fa32fa, xfi_tphy->base + 0x00f8);
/* Force SGDT_OUT off and select PCS */
mtk_phy_update_bits(xfi_tphy->base + REG_DIG_GLB_F4,
XFI_DPHY_AD_SGDT_FRC_EN | XFI_DPHY_PCS_SEL,
XFI_DPHY_AD_SGDT_FRC_EN |
(use_lynxi_pcs ? XFI_DPHY_PCS_SEL_SGMII :
XFI_DPHY_PCS_SEL_USXGMII));
/* Force GLB_CKDET_OUT */
mtk_phy_set_bits(xfi_tphy->base + 0x0030, 0xc00);
/* Force AEQ on */
writel(XTP_PCS_RX_EQ_IN_PROGRESS(2) | XTP_PCS_PWD_SYNC(2) | XTP_PCS_PWD_ASYNC(2),
xfi_tphy->base + REG_DIG_GLB_70);
usleep_range(1, 5);
writel(XTP_LN_FRC_TX_DATA_EN, xfi_tphy->base + REG_DIG_LN_TRX_40);
/* Setup TX DA default value */
mtk_phy_update_bits(xfi_tphy->base + 0x30b0, 0x30, 0x20);
writel(0x00008a01, xfi_tphy->base + 0x3028);
writel(0x0000a884, xfi_tphy->base + 0x302c);
writel(0x00083002, xfi_tphy->base + 0x3024);
/* Setup RG default value */
if (use_lynxi_pcs) {
writel(0x00011110, xfi_tphy->base + 0x3010);
writel(0x40704000, xfi_tphy->base + 0x3048);
} else {
writel(0x00022220, xfi_tphy->base + 0x3010);
writel(0x0f020a01, xfi_tphy->base + 0x5064);
writel(0x06100600, xfi_tphy->base + 0x50b4);
if (interface == PHY_INTERFACE_MODE_USXGMII)
writel(0x40704000, xfi_tphy->base + 0x3048);
else
writel(0x47684100, xfi_tphy->base + 0x3048);
}
if (is_1g)
writel(0x0000c000, xfi_tphy->base + 0x3064);
/* Setup RX EQ initial value */
mtk_phy_update_bits(xfi_tphy->base + 0x3050, 0xa8000000,
(interface != PHY_INTERFACE_MODE_10GBASER) ? 0xa8000000 : 0x0);
mtk_phy_update_bits(xfi_tphy->base + 0x3054, 0xaa,
(interface != PHY_INTERFACE_MODE_10GBASER) ? 0xaa : 0x0);
if (!use_lynxi_pcs)
writel(0x00000f00, xfi_tphy->base + 0x306c);
else if (is_2p5g)
writel(0x22000f00, xfi_tphy->base + 0x306c);
else
writel(0x20200f00, xfi_tphy->base + 0x306c);
mtk_phy_update_bits(xfi_tphy->base + 0xa008, 0x10000, da_war ? 0x10000 : 0x0);
mtk_phy_update_bits(xfi_tphy->base + 0xa060, 0x50000, use_lynxi_pcs ? 0x50000 : 0x40000);
/* Setup PHYA speed */
mtk_phy_update_bits(xfi_tphy->base + REG_ANA_GLB_D0,
XTP_GLB_USXGMII_SEL_MASK | XTP_GLB_USXGMII_EN,
is_10g ? XTP_GLB_USXGMII_SEL(0) :
is_5g ? XTP_GLB_USXGMII_SEL(1) :
is_2p5g ? XTP_GLB_USXGMII_SEL(2) :
XTP_GLB_USXGMII_SEL(3));
mtk_phy_set_bits(xfi_tphy->base + REG_ANA_GLB_D0, XTP_GLB_USXGMII_EN);
/* Release reset */
mtk_phy_set_bits(xfi_tphy->base + REG_DIG_GLB_70,
XTP_PCS_RST_B | XTP_FRC_PCS_RST_B);
usleep_range(150, 500);
/* Switch to P0 */
mtk_phy_update_bits(xfi_tphy->base + REG_DIG_GLB_70,
XTP_PCS_IN_FR_RG |
XTP_FRC_PCS_PWD_ASYNC |
XTP_PCS_PWD_ASYNC_MASK |
XTP_PCS_PWD_SYNC_MASK |
XTP_PCS_UPDT,
XTP_PCS_IN_FR_RG |
XTP_FRC_PCS_PWD_ASYNC |
XTP_PCS_UPDT);
usleep_range(1, 5);
mtk_phy_clear_bits(xfi_tphy->base + REG_DIG_GLB_70, XTP_PCS_UPDT);
usleep_range(15, 50);
if (use_lynxi_pcs) {
/* Switch to Gen2 */
mtk_phy_update_bits(xfi_tphy->base + REG_DIG_GLB_70,
XTP_PCS_MODE_MASK | XTP_PCS_UPDT,
XTP_PCS_MODE(1) | XTP_PCS_UPDT);
} else {
/* Switch to Gen3 */
mtk_phy_update_bits(xfi_tphy->base + REG_DIG_GLB_70,
XTP_PCS_MODE_MASK | XTP_PCS_UPDT,
XTP_PCS_MODE(2) | XTP_PCS_UPDT);
}
usleep_range(1, 5);
mtk_phy_clear_bits(xfi_tphy->base + REG_DIG_GLB_70, XTP_PCS_UPDT);
usleep_range(100, 500);
/* Enable MAC CK */
mtk_phy_set_bits(xfi_tphy->base + REG_DIG_LN_TRX_B0, XTP_LN_TX_MACCK_EN);
mtk_phy_clear_bits(xfi_tphy->base + REG_DIG_GLB_F4, XFI_DPHY_AD_SGDT_FRC_EN);
/* Enable TX data */
mtk_phy_set_bits(xfi_tphy->base + REG_DIG_LN_TRX_40,
XTP_LN_FRC_TX_DATA_EN | XTP_LN_TX_DATA_EN);
usleep_range(400, 1000);
}
/**
* mtk_xfi_tphy_set_mode() - Setup phy for specified interface mode.
*
* @phy: Phy instance.
* @mode: Only PHY_MODE_ETHERNET is supported.
* @submode: An Ethernet interface mode.
*
* Validate selected mode and call function mtk_xfi_tphy_setup().
*
* Return:
* * %0 - OK
* * %-EINVAL - invalid mode
*/
static int mtk_xfi_tphy_set_mode(struct phy *phy, enum phy_mode mode, int
submode)
{
struct mtk_xfi_tphy *xfi_tphy = phy_get_drvdata(phy);
if (mode != PHY_MODE_ETHERNET)
return -EINVAL;
switch (submode) {
case PHY_INTERFACE_MODE_1000BASEX:
case PHY_INTERFACE_MODE_2500BASEX:
case PHY_INTERFACE_MODE_SGMII:
case PHY_INTERFACE_MODE_5GBASER:
case PHY_INTERFACE_MODE_10GBASER:
case PHY_INTERFACE_MODE_USXGMII:
mtk_xfi_tphy_setup(xfi_tphy, submode);
return 0;
default:
return -EINVAL;
}
}
/**
* mtk_xfi_tphy_reset() - Reset the phy.
*
* @phy: Phy instance.
*
* Reset the phy using the external reset controller.
*
* Return:
* %0 - OK
*/
static int mtk_xfi_tphy_reset(struct phy *phy)
{
struct mtk_xfi_tphy *xfi_tphy = phy_get_drvdata(phy);
reset_control_assert(xfi_tphy->reset);
usleep_range(100, 500);
reset_control_deassert(xfi_tphy->reset);
usleep_range(1, 10);
return 0;
}
/**
* mtk_xfi_tphy_power_on() - Power-on the phy.
*
* @phy: Phy instance.
*
* Prepare and enable all clocks required for the phy to operate.
*
* Return:
* See clk_bulk_prepare_enable().
*/
static int mtk_xfi_tphy_power_on(struct phy *phy)
{
struct mtk_xfi_tphy *xfi_tphy = phy_get_drvdata(phy);
return clk_bulk_prepare_enable(MTK_XFI_TPHY_NUM_CLOCKS, xfi_tphy->clocks);
}
/**
* mtk_xfi_tphy_power_off() - Power-off the phy.
*
* @phy: Phy instance.
*
* Disable and unprepare all clocks previously enabled.
*
* Return:
* See clk_bulk_prepare_disable().
*/
static int mtk_xfi_tphy_power_off(struct phy *phy)
{
struct mtk_xfi_tphy *xfi_tphy = phy_get_drvdata(phy);
clk_bulk_disable_unprepare(MTK_XFI_TPHY_NUM_CLOCKS, xfi_tphy->clocks);
return 0;
}
static const struct phy_ops mtk_xfi_tphy_ops = {
.power_on = mtk_xfi_tphy_power_on,
.power_off = mtk_xfi_tphy_power_off,
.set_mode = mtk_xfi_tphy_set_mode,
.reset = mtk_xfi_tphy_reset,
.owner = THIS_MODULE,
};
/**
* mtk_xfi_tphy_probe() - Probe phy instance from Device Tree.
* @pdev: Matching platform device.
*
* The probe function gets IO resource, clocks, reset controller and
* whether the DA work-around for 10GBase-R is required from Device Tree and
* allocates memory for holding that information in a struct mtk_xfi_tphy.
*
* Return:
* * %0 - OK
* * %-ENODEV - Missing associated Device Tree node (should never happen).
* * %-ENOMEM - Out of memory.
* * Any error value which devm_platform_ioremap_resource(),
* devm_clk_bulk_get(), devm_reset_control_get_exclusive(),
* devm_phy_create() or devm_of_phy_provider_register() may return.
*/
static int mtk_xfi_tphy_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct phy_provider *phy_provider;
struct mtk_xfi_tphy *xfi_tphy;
struct phy *phy;
int ret;
if (!np)
return -ENODEV;
xfi_tphy = devm_kzalloc(&pdev->dev, sizeof(*xfi_tphy), GFP_KERNEL);
if (!xfi_tphy)
return -ENOMEM;
xfi_tphy->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(xfi_tphy->base))
return PTR_ERR(xfi_tphy->base);
xfi_tphy->dev = &pdev->dev;
xfi_tphy->clocks[0].id = "topxtal";
xfi_tphy->clocks[1].id = "xfipll";
ret = devm_clk_bulk_get(&pdev->dev, MTK_XFI_TPHY_NUM_CLOCKS, xfi_tphy->clocks);
if (ret)
return ret;
xfi_tphy->reset = devm_reset_control_get_exclusive(&pdev->dev, NULL);
if (IS_ERR(xfi_tphy->reset))
return PTR_ERR(xfi_tphy->reset);
xfi_tphy->da_war = of_property_read_bool(np, "mediatek,usxgmii-performance-errata");
phy = devm_phy_create(&pdev->dev, NULL, &mtk_xfi_tphy_ops);
if (IS_ERR(phy))
return PTR_ERR(phy);
phy_set_drvdata(phy, xfi_tphy);
phy_provider = devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate);
return PTR_ERR_OR_ZERO(phy_provider);
}
static const struct of_device_id mtk_xfi_tphy_match[] = {
{ .compatible = "mediatek,mt7988-xfi-tphy", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mtk_xfi_tphy_match);
static struct platform_driver mtk_xfi_tphy_driver = {
.probe = mtk_xfi_tphy_probe,
.driver = {
.name = "mtk-xfi-tphy",
.of_match_table = mtk_xfi_tphy_match,
},
};
module_platform_driver(mtk_xfi_tphy_driver);
MODULE_DESCRIPTION("MediaTek 10GE SerDes XFI T-PHY driver");
MODULE_AUTHOR("Daniel Golle <daniel@makrotopia.org>");
MODULE_AUTHOR("Bc-bocun Chen <bc-bocun.chen@mediatek.com>");
MODULE_LICENSE("GPL");
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