drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2019 MediaTek Inc.
 * Author: jitao.shi <jitao.shi@mediatek.com>
 */

#include "mtk_mipi_tx.h"

#define MIPITX_LANE_CON		0x000c
#define RG_DSI_CPHY_T1DRV_EN		BIT(0)
#define RG_DSI_ANA_CK_SEL		BIT(1)
#define RG_DSI_PHY_CK_SEL		BIT(2)
#define RG_DSI_CPHY_EN			BIT(3)
#define RG_DSI_PHYCK_INV_EN		BIT(4)
#define RG_DSI_PWR04_EN			BIT(5)
#define RG_DSI_BG_LPF_EN		BIT(6)
#define RG_DSI_BG_CORE_EN		BIT(7)
#define RG_DSI_PAD_TIEL_SEL		BIT(8)

#define MIPITX_PLL_PWR	0x0028
#define MIPITX_PLL_CON0	0x002c
#define MIPITX_PLL_CON1	0x0030
#define MIPITX_PLL_CON2	0x0034
#define MIPITX_PLL_CON3	0x0038
#define MIPITX_PLL_CON4	0x003c
#define RG_DSI_PLL_IBIAS		(3 << 10)

#define MIPITX_D2_SW_CTL_EN	0x0144
#define MIPITX_D0_SW_CTL_EN	0x0244
#define MIPITX_CK_CKMODE_EN	0x0328
#define DSI_CK_CKMODE_EN		BIT(0)
#define MIPITX_CK_SW_CTL_EN	0x0344
#define MIPITX_D1_SW_CTL_EN	0x0444
#define MIPITX_D3_SW_CTL_EN	0x0544
#define DSI_SW_CTL_EN			BIT(0)
#define AD_DSI_PLL_SDM_PWR_ON		BIT(0)
#define AD_DSI_PLL_SDM_ISO_EN		BIT(1)

#define RG_DSI_PLL_EN			BIT(4)
#define RG_DSI_PLL_POSDIV		(0x7 << 8)

static int mtk_mipi_tx_pll_prepare(struct clk_hw *hw)
{
	struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);
	int ret = 0;

	ret = clk_prepare(mipi_tx->ref_clk);
	if (ret < 0)
		dev_err(mipi_tx->dev,
			"can't prepare mipi_tx ref_clk %d\n", ret);

	return ret;
}

static int mtk_mipi_tx_pll_enable(struct clk_hw *hw)
{
	struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);
	unsigned int txdiv, txdiv0;
	u64 pcw;
	int ret;

	dev_dbg(mipi_tx->dev, "enable: %u bps\n", mipi_tx->data_rate);

	if (mipi_tx->data_rate >= 2000000000) {
		txdiv = 1;
		txdiv0 = 0;
	} else if (mipi_tx->data_rate >= 1000000000) {
		txdiv = 2;
		txdiv0 = 1;
	} else if (mipi_tx->data_rate >= 500000000) {
		txdiv = 4;
		txdiv0 = 2;
	} else if (mipi_tx->data_rate > 250000000) {
		txdiv = 8;
		txdiv0 = 3;
	} else if (mipi_tx->data_rate >= 125000000) {
		txdiv = 16;
		txdiv0 = 4;
	} else {
		return -EINVAL;
	}

	ret = clk_enable(mipi_tx->ref_clk);
	if (ret < 0) {
		dev_err(mipi_tx->dev,
			"can't enable mipi_tx ref_clk %d\n", ret);
		return ret;
	}

	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_PLL_CON4, RG_DSI_PLL_IBIAS);

	mtk_mipi_tx_set_bits(mipi_tx, MIPITX_PLL_PWR, AD_DSI_PLL_SDM_PWR_ON);
	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_PLL_CON1, RG_DSI_PLL_EN);
	udelay(1);
	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_PLL_PWR, AD_DSI_PLL_SDM_ISO_EN);
	pcw = div_u64(((u64)mipi_tx->data_rate * txdiv) << 24, 26000000);
	writel(pcw, mipi_tx->regs + MIPITX_PLL_CON0);
	mtk_mipi_tx_update_bits(mipi_tx, MIPITX_PLL_CON1, RG_DSI_PLL_POSDIV,
				txdiv0 << 8);
	mtk_mipi_tx_set_bits(mipi_tx, MIPITX_PLL_CON1, RG_DSI_PLL_EN);

	return 0;
}

static void mtk_mipi_tx_pll_unprepare(struct clk_hw *hw)
{
	struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);

	clk_unprepare(mipi_tx->ref_clk);
}

static void mtk_mipi_tx_pll_disable(struct clk_hw *hw)
{
	struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);

	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_PLL_CON1, RG_DSI_PLL_EN);

	mtk_mipi_tx_set_bits(mipi_tx, MIPITX_PLL_PWR, AD_DSI_PLL_SDM_ISO_EN);
	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_PLL_PWR, AD_DSI_PLL_SDM_PWR_ON);
	clk_disable(mipi_tx->ref_clk);
}

static long mtk_mipi_tx_pll_round_rate(struct clk_hw *hw, unsigned long rate,
				       unsigned long *prate)
{
	return clamp_val(rate, 50000000, 1600000000);
}

static const struct clk_ops mtk_mipi_tx_pll_ops = {
	.prepare = mtk_mipi_tx_pll_prepare,
	.enable = mtk_mipi_tx_pll_enable,
	.unprepare = mtk_mipi_tx_pll_unprepare,
	.disable = mtk_mipi_tx_pll_disable,
	.round_rate = mtk_mipi_tx_pll_round_rate,
	.set_rate = mtk_mipi_tx_pll_set_rate,
	.recalc_rate = mtk_mipi_tx_pll_recalc_rate,
};

static void mtk_mipi_tx_power_on_signal(struct phy *phy)
{
	struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);

	/* BG_LPF_EN / BG_CORE_EN */
	writel(RG_DSI_PAD_TIEL_SEL | RG_DSI_BG_CORE_EN,
	       mipi_tx->regs + MIPITX_LANE_CON);
	usleep_range(30, 100);
	writel(RG_DSI_BG_CORE_EN | RG_DSI_BG_LPF_EN,
	       mipi_tx->regs + MIPITX_LANE_CON);

	/* Switch OFF each Lane */
	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_D0_SW_CTL_EN, DSI_SW_CTL_EN);
	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_D1_SW_CTL_EN, DSI_SW_CTL_EN);
	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_D2_SW_CTL_EN, DSI_SW_CTL_EN);
	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_D3_SW_CTL_EN, DSI_SW_CTL_EN);
	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_CK_SW_CTL_EN, DSI_SW_CTL_EN);

	mtk_mipi_tx_set_bits(mipi_tx, MIPITX_CK_CKMODE_EN, DSI_CK_CKMODE_EN);
}

static void mtk_mipi_tx_power_off_signal(struct phy *phy)
{
	struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);

	/* Switch ON each Lane */
	mtk_mipi_tx_set_bits(mipi_tx, MIPITX_D0_SW_CTL_EN, DSI_SW_CTL_EN);
	mtk_mipi_tx_set_bits(mipi_tx, MIPITX_D1_SW_CTL_EN, DSI_SW_CTL_EN);
	mtk_mipi_tx_set_bits(mipi_tx, MIPITX_D2_SW_CTL_EN, DSI_SW_CTL_EN);
	mtk_mipi_tx_set_bits(mipi_tx, MIPITX_D3_SW_CTL_EN, DSI_SW_CTL_EN);
	mtk_mipi_tx_set_bits(mipi_tx, MIPITX_CK_SW_CTL_EN, DSI_SW_CTL_EN);

	writel(RG_DSI_PAD_TIEL_SEL | RG_DSI_BG_CORE_EN,
	       mipi_tx->regs + MIPITX_LANE_CON);
	writel(RG_DSI_PAD_TIEL_SEL, mipi_tx->regs + MIPITX_LANE_CON);
}

const struct mtk_mipitx_data mt8183_mipitx_data = {
	.mipi_tx_clk_ops = &mtk_mipi_tx_pll_ops,
	.mipi_tx_enable_signal = mtk_mipi_tx_power_on_signal,
	.mipi_tx_disable_signal = mtk_mipi_tx_power_off_signal,
};