drivers/phy/starfive/phy-jh7110-dphy-tx.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * DPHY TX driver for the StarFive JH7110 SoC
 *
 * Copyright (C) 2023 StarFive Technology Co., Ltd.
 * Author: Keith Zhao <keith.zhao@starfivetech.com>
 * Author: Shengyang Chen <shengyang.chen@starfivetech.com>
 */

#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/phy/phy.h>
#include <linux/phy/phy-mipi-dphy.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>

#define STF_DPHY_APBIFSAIF_SYSCFG(x)			(x)

#define STF_DPHY_AON_POWER_READY_N_ACTIVE		0
#define STF_DPHY_AON_POWER_READY_N			BIT(0)
#define STF_DPHY_CFG_L0_SWAP_SEL			GENMASK(14, 12)
#define STF_DPHY_CFG_L1_SWAP_SEL			GENMASK(17, 15)
#define STF_DPHY_CFG_L2_SWAP_SEL			GENMASK(20, 18)
#define STF_DPHY_CFG_L3_SWAP_SEL			GENMASK(23, 21)
#define STF_DPHY_CFG_L4_SWAP_SEL			GENMASK(26, 24)
#define STF_DPHY_RGS_CDTX_PLL_UNLOCK			BIT(18)
#define STF_DPHY_RG_CDTX_L0N_HSTX_RES			GENMASK(23, 19)
#define STF_DPHY_RG_CDTX_L0P_HSTX_RES			GENMASK(28, 24)

#define STF_DPHY_RG_CDTX_L1P_HSTX_RES			GENMASK(9, 5)
#define STF_DPHY_RG_CDTX_L2N_HSTX_RES			GENMASK(14, 10)
#define STF_DPHY_RG_CDTX_L2P_HSTX_RES			GENMASK(19, 15)
#define STF_DPHY_RG_CDTX_L3N_HSTX_RES			GENMASK(24, 20)
#define STF_DPHY_RG_CDTX_L3P_HSTX_RES			GENMASK(29, 25)

#define STF_DPHY_RG_CDTX_L4N_HSTX_RES			GENMASK(4, 0)
#define STF_DPHY_RG_CDTX_L4P_HSTX_RES			GENMASK(9, 5)
#define STF_DPHY_RG_CDTX_PLL_FBK_FRA			GENMASK(23, 0)

#define STF_DPHY_RG_CDTX_PLL_FBK_INT			GENMASK(8, 0)
#define STF_DPHY_RG_CDTX_PLL_FM_EN			BIT(9)
#define STF_DPHY_RG_CDTX_PLL_LDO_STB_X2_EN		BIT(10)
#define STF_DPHY_RG_CDTX_PLL_PRE_DIV			GENMASK(12, 11)

#define STF_DPHY_RG_CDTX_PLL_SSC_EN			BIT(18)

#define STF_DPHY_RG_CLANE_HS_CLK_POST_TIME		GENMASK(7, 0)
#define STF_DPHY_RG_CLANE_HS_CLK_PRE_TIME		GENMASK(15, 8)
#define STF_DPHY_RG_CLANE_HS_PRE_TIME			GENMASK(23, 16)
#define STF_DPHY_RG_CLANE_HS_TRAIL_TIME			GENMASK(31, 24)

#define STF_DPHY_RG_CLANE_HS_ZERO_TIME			GENMASK(7, 0)
#define STF_DPHY_RG_DLANE_HS_PRE_TIME			GENMASK(15, 8)
#define STF_DPHY_RG_DLANE_HS_TRAIL_TIME			GENMASK(23, 16)
#define STF_DPHY_RG_DLANE_HS_ZERO_TIME			GENMASK(31, 24)

#define STF_DPHY_RG_EXTD_CYCLE_SEL			GENMASK(2, 0)
#define STF_DPHY_SCFG_C_HS_PRE_ZERO_TIME		GENMASK(31, 0)

#define STF_DPHY_SCFG_DSI_TXREADY_ESC_SEL		GENMASK(2, 1)
#define STF_DPHY_SCFG_PPI_C_READY_SEL			GENMASK(4, 3)

#define STF_DPHY_REFCLK_IN_SEL				GENMASK(28, 26)
#define STF_DPHY_RESETB					BIT(29)

#define STF_DPHY_REFCLK_12M				1
#define STF_DPHY_BITRATE_ALIGN				10000000

#define STF_MAP_LANES_NUM				5

#define STF_DPHY_LSHIFT_16(x)				(FIELD_PREP(GENMASK(23, 16), (x)))
#define STF_DPHY_LSHIFT_8(x)				(FIELD_PREP(GENMASK(15, 8), (x)))

#define STF_DPHY_HW_DELAY_US				200
#define STF_DPHY_HW_TIMEOUT_US				5000

struct stf_dphy_config {
	unsigned long bitrate;
	u32 pll_fbk_int;
	u32 pll_fbk_fra_val;
	u32 extd_cycle_sel;
	u32 dlane_hs_pre_time;
	u32 dlane_hs_zero_time;
	u32 dlane_hs_trail_time;
	u32 clane_hs_pre_time;
	u32 clane_hs_zero_time;
	u32 clane_hs_trail_time;
	u32 clane_hs_clk_pre_time;
	u32 clane_hs_clk_post_time;
};

static const struct stf_dphy_config reg_configs[] = {
	{160000000, 0x6a, 0xaa, 0x3, 0xa, 0x17, 0x11, 0x5, 0x2b, 0xd, 0x7, 0x3d},
	{170000000, 0x71, 0x55, 0x3, 0xb, 0x18, 0x11, 0x5, 0x2e, 0xd, 0x7, 0x3d},
	{180000000, 0x78, 0x0, 0x3, 0xb, 0x19, 0x12, 0x6, 0x30, 0xe, 0x7, 0x3e},
	{190000000, 0x7e, 0xaa, 0x3, 0xc, 0x1a, 0x12, 0x6, 0x33, 0xe, 0x7, 0x3e},
	{200000000, 0x85, 0x55, 0x3, 0xc, 0x1b, 0x13, 0x7, 0x35, 0xf, 0x7, 0x3f},
	{320000000, 0x6a, 0xaa, 0x2, 0x8, 0x14, 0xf, 0x5, 0x2b, 0xd, 0x3, 0x23},
	{330000000, 0x6e, 0x0, 0x2, 0x8, 0x15, 0xf, 0x5, 0x2d, 0xd, 0x3, 0x23},
	{340000000, 0x71, 0x55, 0x2, 0x9, 0x15, 0xf, 0x5, 0x2e, 0xd, 0x3, 0x23},
	{350000000, 0x74, 0xaa, 0x2, 0x9, 0x15, 0x10, 0x6, 0x2f, 0xe, 0x3, 0x24},
	{360000000, 0x78, 0x0, 0x2, 0x9, 0x16, 0x10, 0x6, 0x30, 0xe, 0x3, 0x24},
	{370000000, 0x7b, 0x55, 0x2, 0x9, 0x17, 0x10, 0x6, 0x32, 0xe, 0x3, 0x24},
	{380000000, 0x7e, 0xaa, 0x2, 0xa, 0x17, 0x10, 0x6, 0x33, 0xe, 0x3, 0x24},
	{390000000, 0x82, 0x0, 0x2, 0xa, 0x17, 0x11, 0x6, 0x35, 0xf, 0x3, 0x25},
	{400000000, 0x85, 0x55, 0x2, 0xa, 0x18, 0x11, 0x7, 0x35, 0xf, 0x3, 0x25},
	{410000000, 0x88, 0xaa, 0x2, 0xa, 0x19, 0x11, 0x7, 0x37, 0xf, 0x3, 0x25},
	{420000000, 0x8c, 0x0, 0x2, 0xa, 0x19, 0x12, 0x7, 0x38, 0x10, 0x3, 0x26},
	{430000000, 0x8f, 0x55, 0x2, 0xb, 0x19, 0x12, 0x7, 0x39, 0x10, 0x3, 0x26},
	{440000000, 0x92, 0xaa, 0x2, 0xb, 0x1a, 0x12, 0x7, 0x3b, 0x10, 0x3, 0x26},
	{450000000, 0x96, 0x0, 0x2, 0xb, 0x1b, 0x12, 0x8, 0x3c, 0x10, 0x3, 0x26},
	{460000000, 0x99, 0x55, 0x2, 0xb, 0x1b, 0x13, 0x8, 0x3d, 0x11, 0x3, 0x27},
	{470000000, 0x9c, 0xaa, 0x2, 0xc, 0x1b, 0x13, 0x8, 0x3e, 0x11, 0x3, 0x27},
	{480000000, 0xa0, 0x27, 0x2, 0xc, 0x1c, 0x13, 0x8, 0x40, 0x11, 0x3, 0x27},
	{490000000, 0xa3, 0x55, 0x2, 0xc, 0x1d, 0x14, 0x8, 0x42, 0x12, 0x3, 0x28},
	{500000000, 0xa6, 0xaa, 0x2, 0xc, 0x1d, 0x14, 0x9, 0x42, 0x12, 0x3, 0x28},
	{510000000, 0xaa, 0x0, 0x2, 0xc, 0x1e, 0x14, 0x9, 0x44, 0x12, 0x3, 0x28},
	{520000000, 0xad, 0x55, 0x2, 0xd, 0x1e, 0x15, 0x9, 0x45, 0x13, 0x3, 0x29},
	{530000000, 0xb0, 0xaa, 0x2, 0xd, 0x1e, 0x15, 0x9, 0x47, 0x13, 0x3, 0x29},
	{540000000, 0xb4, 0x0, 0x2, 0xd, 0x1f, 0x15, 0x9, 0x48, 0x13, 0x3, 0x29},
	{550000000, 0xb7, 0x55, 0x2, 0xd, 0x20, 0x16, 0x9, 0x4a, 0x14, 0x3, 0x2a},
	{560000000, 0xba, 0xaa, 0x2, 0xe, 0x20, 0x16, 0xa, 0x4a, 0x14, 0x3, 0x2a},
	{570000000, 0xbe, 0x0, 0x2, 0xe, 0x20, 0x16, 0xa, 0x4c, 0x14, 0x3, 0x2a},
	{580000000, 0xc1, 0x55, 0x2, 0xe, 0x21, 0x16, 0xa, 0x4d, 0x14, 0x3, 0x2a},
	{590000000, 0xc4, 0xaa, 0x2, 0xe, 0x22, 0x17, 0xa, 0x4f, 0x15, 0x3, 0x2b},
	{600000000, 0xc8, 0x0, 0x2, 0xe, 0x23, 0x17, 0xa, 0x50, 0x15, 0x3, 0x2b},
	{610000000, 0xcb, 0x55, 0x2, 0xf, 0x22, 0x17, 0xb, 0x50, 0x15, 0x3, 0x2b},
	{620000000, 0xce, 0xaa, 0x2, 0xf, 0x23, 0x18, 0xb, 0x52, 0x16, 0x3, 0x2c},
	{630000000, 0x69, 0x0, 0x1, 0x7, 0x12, 0xd, 0x5, 0x2a, 0xc, 0x1, 0x15},
	{640000000, 0x6a, 0xaa, 0x1, 0x7, 0x13, 0xe, 0x5, 0x2b, 0xd, 0x1, 0x16},
	{650000000, 0x6c, 0x55, 0x1, 0x7, 0x13, 0xe, 0x5, 0x2c, 0xd, 0x1, 0x16},
	{660000000, 0x6e, 0x0, 0x1, 0x7, 0x13, 0xe, 0x5, 0x2d, 0xd, 0x1, 0x16},
	{670000000, 0x6f, 0xaa, 0x1, 0x8, 0x13, 0xe, 0x5, 0x2d, 0xd, 0x1, 0x16},
	{680000000, 0x71, 0x55, 0x1, 0x8, 0x13, 0xe, 0x5, 0x2e, 0xd, 0x1, 0x16},
	{690000000, 0x73, 0x0, 0x1, 0x8, 0x14, 0xe, 0x6, 0x2e, 0xd, 0x1, 0x16},
	{700000000, 0x74, 0xaa, 0x1, 0x8, 0x14, 0xf, 0x6, 0x2f, 0xe, 0x1, 0x16},
	{710000000, 0x76, 0x55, 0x1, 0x8, 0x14, 0xf, 0x6, 0x2f, 0xe, 0x1, 0x17},
	{720000000, 0x78, 0x0, 0x1, 0x8, 0x15, 0xf, 0x6, 0x30, 0xe, 0x1, 0x17},
	{730000000, 0x79, 0xaa, 0x1, 0x8, 0x15, 0xf, 0x6, 0x31, 0xe, 0x1, 0x17},
	{740000000, 0x7b, 0x55, 0x1, 0x8, 0x15, 0xf, 0x6, 0x32, 0xe, 0x1, 0x17},
	{750000000, 0x7d, 0x0, 0x1, 0x8, 0x16, 0xf, 0x6, 0x32, 0xe, 0x1, 0x17},
	{760000000, 0x7e, 0xaa, 0x1, 0x9, 0x15, 0xf, 0x6, 0x33, 0xe, 0x1, 0x17},
	{770000000, 0x80, 0x55, 0x1, 0x9, 0x15, 0x10, 0x6, 0x34, 0xf, 0x1, 0x18},
	{780000000, 0x82, 0x0, 0x1, 0x9, 0x16, 0x10, 0x6, 0x35, 0xf, 0x1, 0x18,},
	{790000000, 0x83, 0xaa, 0x1, 0x9, 0x16, 0x10, 0x7, 0x34, 0xf, 0x1, 0x18},
	{800000000, 0x85, 0x55, 0x1, 0x9, 0x17, 0x10, 0x7, 0x35, 0xf, 0x1, 0x18},
	{810000000, 0x87, 0x0, 0x1, 0x9, 0x17, 0x10, 0x7, 0x36, 0xf, 0x1, 0x18},
	{820000000, 0x88, 0xaa, 0x1, 0x9, 0x17, 0x10, 0x7, 0x37, 0xf, 0x1, 0x18},
	{830000000, 0x8a, 0x55, 0x1, 0x9, 0x18, 0x10, 0x7, 0x37, 0xf, 0x1, 0x18},
	{840000000, 0x8c, 0x0, 0x1, 0x9, 0x18, 0x11, 0x7, 0x38, 0x10, 0x1, 0x19},
	{850000000, 0x8d, 0xaa, 0x1, 0xa, 0x17, 0x11, 0x7, 0x39, 0x10, 0x1, 0x19},
	{860000000, 0x8f, 0x55, 0x1, 0xa, 0x18, 0x11, 0x7, 0x39, 0x10, 0x1, 0x19},
	{870000000, 0x91, 0x0, 0x1, 0xa, 0x18, 0x11, 0x7, 0x3a, 0x10, 0x1, 0x19},
	{880000000, 0x92, 0xaa, 0x1, 0xa, 0x18, 0x11, 0x7, 0x3b, 0x10, 0x1, 0x19},
	{890000000, 0x94, 0x55, 0x1, 0xa, 0x19, 0x11, 0x7, 0x3c, 0x10, 0x1, 0x19},
	{900000000, 0x96, 0x0, 0x1, 0xa, 0x19, 0x12, 0x8, 0x3c, 0x10, 0x1, 0x19},
	{910000000, 0x97, 0xaa, 0x1, 0xa, 0x19, 0x12, 0x8, 0x3c, 0x11, 0x1, 0x1a},
	{920000000, 0x99, 0x55, 0x1, 0xa, 0x1a, 0x12, 0x8, 0x3d, 0x11, 0x1, 0x1a},
	{930000000, 0x9b, 0x0, 0x1, 0xa, 0x1a, 0x12, 0x8, 0x3e, 0x11, 0x1, 0x1a},
	{940000000, 0x9c, 0xaa, 0x1, 0xb, 0x1a, 0x12, 0x8, 0x3e, 0x11, 0x1, 0x1a},
	{950000000, 0x9e, 0x55, 0x1, 0xb, 0x1a, 0x12, 0x8, 0x3f, 0x11, 0x1, 0x1a},
	{960000000, 0xa0, 0x0, 0x1, 0xb, 0x1a, 0x12, 0x8, 0x40, 0x11, 0x1, 0x1a},
	{970000000, 0xa1, 0xaa, 0x1, 0xb, 0x1b, 0x13, 0x8, 0x41, 0x12, 0x1, 0x1b},
	{980000000, 0xa3, 0x55, 0x1, 0xb, 0x1b, 0x13, 0x8, 0x42, 0x12, 0x1, 0x1b},
	{990000000, 0xa5, 0x0, 0x1, 0xb, 0x1b, 0x13, 0x8, 0x42, 0x12, 0x1, 0x1b},
	{1000000000, 0xa6, 0xaa, 0x1, 0xb, 0x1c, 0x13, 0x9, 0x42, 0x12, 0x1, 0x1b},
};

struct stf_dphy_info {
	/**
	 * @maps:
	 *
	 * Physical lanes and logic lanes mapping table.
	 *
	 * The default order is:
	 * [data lane 0, data lane 1, data lane 2, date lane 3, clk lane]
	 */
	u8 maps[STF_MAP_LANES_NUM];
};

struct stf_dphy {
	struct device *dev;
	void __iomem *topsys;
	struct clk *txesc_clk;
	struct reset_control *sys_rst;

	struct phy_configure_opts_mipi_dphy config;

	struct phy *phy;
	const struct stf_dphy_info *info;
};

static u32 stf_dphy_get_config_index(u32 bitrate)
{
	u32 i;

	for (i = 0; i < ARRAY_SIZE(reg_configs); i++) {
		if (reg_configs[i].bitrate == bitrate)
			return i;
	}

	return 0;
}

static void stf_dphy_hw_reset(struct stf_dphy *dphy, int assert)
{
	int rc;
	u32 status = 0;

	writel(FIELD_PREP(STF_DPHY_RESETB, assert),
	       dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(100));

	if (assert) {
		rc = readl_poll_timeout_atomic(dphy->topsys +
					       STF_DPHY_APBIFSAIF_SYSCFG(8),
					       status,
					       !(FIELD_GET(STF_DPHY_RGS_CDTX_PLL_UNLOCK, status)),
					       STF_DPHY_HW_DELAY_US, STF_DPHY_HW_TIMEOUT_US);
		if (rc)
			dev_err(dphy->dev, "MIPI dphy-tx # PLL Locked\n");
	}
}

static int stf_dphy_configure(struct phy *phy, union phy_configure_opts *opts)
{
	struct stf_dphy *dphy = phy_get_drvdata(phy);
	const struct stf_dphy_info *info = dphy->info;
	const struct stf_dphy_config *p = reg_configs;
	unsigned long alignment  = STF_DPHY_BITRATE_ALIGN;
	u32 bitrate = opts->mipi_dphy.hs_clk_rate;
	u32 tmp;
	u32 i;

	if (bitrate % alignment)
		bitrate += alignment - (bitrate % alignment);

	i = stf_dphy_get_config_index(bitrate);

	tmp = readl(dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(100));
	tmp &= ~STF_DPHY_REFCLK_IN_SEL;
	tmp |= FIELD_PREP(STF_DPHY_REFCLK_IN_SEL, STF_DPHY_REFCLK_12M);
	writel(tmp, dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(100));

	writel(FIELD_PREP(STF_DPHY_RG_CDTX_L0N_HSTX_RES, 0x10) |
	       FIELD_PREP(STF_DPHY_RG_CDTX_L0P_HSTX_RES, 0x10),
	       dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(8));

	writel(FIELD_PREP(STF_DPHY_RG_CDTX_L0N_HSTX_RES, 0x10) |
	       FIELD_PREP(STF_DPHY_RG_CDTX_L2N_HSTX_RES, 0x10) |
	       FIELD_PREP(STF_DPHY_RG_CDTX_L3N_HSTX_RES, 0x10) |
	       FIELD_PREP(STF_DPHY_RG_CDTX_L1P_HSTX_RES, 0x10) |
	       FIELD_PREP(STF_DPHY_RG_CDTX_L2P_HSTX_RES, 0x10) |
	       FIELD_PREP(STF_DPHY_RG_CDTX_L3P_HSTX_RES, 0x10),
	       dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(12));

	writel(FIELD_PREP(STF_DPHY_RG_CDTX_L4N_HSTX_RES, 0x10) |
	       FIELD_PREP(STF_DPHY_RG_CDTX_L4P_HSTX_RES, 0x10),
	       dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(16));

	/* Lane setting */
	writel(FIELD_PREP(STF_DPHY_AON_POWER_READY_N,
			  STF_DPHY_AON_POWER_READY_N_ACTIVE) |
	       FIELD_PREP(STF_DPHY_CFG_L0_SWAP_SEL, info->maps[0]) |
	       FIELD_PREP(STF_DPHY_CFG_L1_SWAP_SEL, info->maps[1]) |
	       FIELD_PREP(STF_DPHY_CFG_L2_SWAP_SEL, info->maps[2]) |
	       FIELD_PREP(STF_DPHY_CFG_L3_SWAP_SEL, info->maps[3]) |
	       FIELD_PREP(STF_DPHY_CFG_L4_SWAP_SEL, info->maps[4]),
	       dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(0));

	/* PLL setting */
	writel(FIELD_PREP(STF_DPHY_RG_CDTX_PLL_SSC_EN, 0x0),
	       dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(28));

	writel(FIELD_PREP(STF_DPHY_RG_CDTX_PLL_LDO_STB_X2_EN, 0x1) |
	       FIELD_PREP(STF_DPHY_RG_CDTX_PLL_FM_EN, 0x1) |
	       FIELD_PREP(STF_DPHY_RG_CDTX_PLL_PRE_DIV, 0x0) |
	       FIELD_PREP(STF_DPHY_RG_CDTX_PLL_FBK_INT, p[i].pll_fbk_int),
	       dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(24));

	writel(FIELD_PREP(STF_DPHY_RG_CDTX_PLL_FBK_FRA,
			  STF_DPHY_LSHIFT_16(p[i].pll_fbk_fra_val) |
			  STF_DPHY_LSHIFT_8(p[i].pll_fbk_fra_val) |
			  p[i].pll_fbk_fra_val),
	       dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(20));

	writel(FIELD_PREP(STF_DPHY_RG_EXTD_CYCLE_SEL, p[i].extd_cycle_sel),
	       dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(40));

	writel(FIELD_PREP(STF_DPHY_RG_DLANE_HS_PRE_TIME,  p[i].dlane_hs_pre_time) |
	       FIELD_PREP(STF_DPHY_RG_DLANE_HS_ZERO_TIME, p[i].dlane_hs_zero_time) |
	       FIELD_PREP(STF_DPHY_RG_DLANE_HS_TRAIL_TIME, p[i].dlane_hs_trail_time) |
	       FIELD_PREP(STF_DPHY_RG_CLANE_HS_ZERO_TIME, p[i].clane_hs_zero_time),
	       dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(36));

	writel(FIELD_PREP(STF_DPHY_RG_CLANE_HS_PRE_TIME,  p[i].clane_hs_pre_time) |
	       FIELD_PREP(STF_DPHY_RG_CLANE_HS_TRAIL_TIME, p[i].clane_hs_trail_time) |
	       FIELD_PREP(STF_DPHY_RG_CLANE_HS_CLK_PRE_TIME, p[i].clane_hs_clk_pre_time) |
	       FIELD_PREP(STF_DPHY_RG_CLANE_HS_CLK_POST_TIME, p[i].clane_hs_clk_post_time),
	       dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(32));

	return 0;
}

static int stf_dphy_init(struct phy *phy)
{
	struct stf_dphy *dphy = phy_get_drvdata(phy);
	int ret;

	stf_dphy_hw_reset(dphy, 1);

	writel(FIELD_PREP(STF_DPHY_SCFG_PPI_C_READY_SEL, 0) |
	       FIELD_PREP(STF_DPHY_SCFG_DSI_TXREADY_ESC_SEL, 0),
	       dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(48));

	writel(FIELD_PREP(STF_DPHY_SCFG_C_HS_PRE_ZERO_TIME, 0x30),
	       dphy->topsys + STF_DPHY_APBIFSAIF_SYSCFG(44));

	ret = clk_prepare_enable(dphy->txesc_clk);
	if (ret) {
		dev_err(dphy->dev, "Failed to prepare/enable txesc_clk\n");
		return ret;
	}

	ret = reset_control_deassert(dphy->sys_rst);
	if (ret) {
		dev_err(dphy->dev, "Failed to deassert sys_rst\n");
		return ret;
	}

	return 0;
}

static int stf_dphy_exit(struct phy *phy)
{
	struct stf_dphy *dphy = phy_get_drvdata(phy);
	int ret;

	ret = reset_control_assert(dphy->sys_rst);
	if (ret) {
		dev_err(dphy->dev, "Failed to assert sys_rst\n");
		return ret;
	}

	clk_disable_unprepare(dphy->txesc_clk);

	stf_dphy_hw_reset(dphy, 0);

	return 0;
}

static int stf_dphy_power_on(struct phy *phy)
{
	struct stf_dphy *dphy = phy_get_drvdata(phy);

	return pm_runtime_resume_and_get(dphy->dev);
}

static int stf_dphy_validate(struct phy *phy, enum phy_mode mode, int submode,
			     union phy_configure_opts *opts)
{
	if (mode != PHY_MODE_MIPI_DPHY)
		return -EINVAL;

	return 0;
}

static int stf_dphy_power_off(struct phy *phy)
{
	struct stf_dphy *dphy = phy_get_drvdata(phy);

	return pm_runtime_put_sync(dphy->dev);
}

static const struct phy_ops stf_dphy_ops = {
	.power_on	= stf_dphy_power_on,
	.power_off	= stf_dphy_power_off,
	.init		= stf_dphy_init,
	.exit		= stf_dphy_exit,
	.configure	= stf_dphy_configure,
	.validate	= stf_dphy_validate,
	.owner		= THIS_MODULE,
};

static int stf_dphy_probe(struct platform_device *pdev)
{
	struct phy_provider *phy_provider;
	struct stf_dphy *dphy;

	dphy = devm_kzalloc(&pdev->dev, sizeof(*dphy), GFP_KERNEL);
	if (!dphy)
		return -ENOMEM;

	dphy->info = of_device_get_match_data(&pdev->dev);

	dphy->dev = &pdev->dev;
	dev_set_drvdata(&pdev->dev, dphy);

	dphy->topsys = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(dphy->topsys))
		return PTR_ERR(dphy->topsys);

	pm_runtime_enable(&pdev->dev);

	dphy->txesc_clk = devm_clk_get(&pdev->dev, "txesc");
	if (IS_ERR(dphy->txesc_clk))
		return dev_err_probe(&pdev->dev, PTR_ERR(dphy->txesc_clk),
				     "Failed to get txesc clock\n");

	dphy->sys_rst = devm_reset_control_get_exclusive(&pdev->dev, "sys");
	if (IS_ERR(dphy->sys_rst))
		return dev_err_probe(&pdev->dev, PTR_ERR(dphy->sys_rst),
				     "Failed to get sys reset\n");

	dphy->phy = devm_phy_create(&pdev->dev, NULL, &stf_dphy_ops);
	if (IS_ERR(dphy->phy))
		return dev_err_probe(&pdev->dev, PTR_ERR(dphy->phy),
				     "Failed to create phy\n");

	phy_set_drvdata(dphy->phy, dphy);

	phy_provider = devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate);
	if (IS_ERR(phy_provider))
		return dev_err_probe(&pdev->dev, PTR_ERR(phy_provider),
				     "Failed to register phy\n");

	return 0;
}

static const struct stf_dphy_info starfive_dphy_info = {
	.maps = {0, 1, 2, 3, 4},
};

static const struct of_device_id stf_dphy_dt_ids[] = {
	{
		.compatible = "starfive,jh7110-dphy-tx",
		.data = &starfive_dphy_info,
	},
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, stf_dphy_dt_ids);

static struct platform_driver stf_dphy_driver = {
	.driver = {
		.name	= "starfive-dphy-tx",
		.of_match_table = stf_dphy_dt_ids,
	},
	.probe = stf_dphy_probe,
};
module_platform_driver(stf_dphy_driver);

MODULE_AUTHOR("Keith Zhao <keith.zhao@starfivetech.com>");
MODULE_AUTHOR("Shengyang Chen <shengyang.chen@starfivetech.com>");
MODULE_DESCRIPTION("StarFive JH7110 DPHY TX driver");
MODULE_LICENSE("GPL");