linux/drivers/phy/mediatek/phy-mtk-pcie.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2022 MediaTek Inc.
 * Author: Jianjun Wang <[email protected]>
 */

#include <linux/bitfield.h>
#include <linux/module.h>
#include <linux/nvmem-consumer.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include "phy-mtk-io.h"

#define PEXTP_ANA_GLB_00_REG …
/* Internal Resistor Selection of TX Bias Current */
#define EFUSE_GLB_INTR_SEL …

#define PEXTP_ANA_LN0_TRX_REG …

#define PEXTP_ANA_TX_REG …
/* TX PMOS impedance selection */
#define EFUSE_LN_TX_PMOS_SEL …
/* TX NMOS impedance selection */
#define EFUSE_LN_TX_NMOS_SEL …

#define PEXTP_ANA_RX_REG …
/* RX impedance selection */
#define EFUSE_LN_RX_SEL …

#define PEXTP_ANA_LANE_OFFSET …

/**
 * struct mtk_pcie_lane_efuse - eFuse data for each lane
 * @tx_pmos: TX PMOS impedance selection data
 * @tx_nmos: TX NMOS impedance selection data
 * @rx_data: RX impedance selection data
 * @lane_efuse_supported: software eFuse data is supported for this lane
 */
struct mtk_pcie_lane_efuse { … };

/**
 * struct mtk_pcie_phy_data - phy data for each SoC
 * @num_lanes: supported lane numbers
 * @sw_efuse_supported: support software to load eFuse data
 */
struct mtk_pcie_phy_data { … };

/**
 * struct mtk_pcie_phy - PCIe phy driver main structure
 * @dev: pointer to device
 * @phy: pointer to generic phy
 * @sif_base: IO mapped register base address of system interface
 * @data: pointer to SoC dependent data
 * @sw_efuse_en: software eFuse enable status
 * @efuse_glb_intr: internal resistor selection of TX bias current data
 * @efuse: pointer to eFuse data for each lane
 */
struct mtk_pcie_phy { … };

static void mtk_pcie_efuse_set_lane(struct mtk_pcie_phy *pcie_phy,
				    unsigned int lane)
{ … }

/**
 * mtk_pcie_phy_init() - Initialize the phy
 * @phy: the phy to be initialized
 *
 * Initialize the phy by setting the efuse data.
 * The hardware settings will be reset during suspend, it should be
 * reinitialized when the consumer calls phy_init() again on resume.
 */
static int mtk_pcie_phy_init(struct phy *phy)
{ … }

static const struct phy_ops mtk_pcie_phy_ops = …;

static int mtk_pcie_efuse_read_for_lane(struct mtk_pcie_phy *pcie_phy,
					unsigned int lane)
{ … }

static int mtk_pcie_read_efuse(struct mtk_pcie_phy *pcie_phy)
{ … }

static int mtk_pcie_phy_probe(struct platform_device *pdev)
{ … }

static const struct mtk_pcie_phy_data mt8195_data = …;

static const struct of_device_id mtk_pcie_phy_of_match[] = …;
MODULE_DEVICE_TABLE(of, mtk_pcie_phy_of_match);

static struct platform_driver mtk_pcie_phy_driver = …;
module_platform_driver(…) …;

MODULE_DESCRIPTION(…) …;
MODULE_AUTHOR(…) …;
MODULE_LICENSE(…) …;