492 lines
13 KiB
C
492 lines
13 KiB
C
/*
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* Copyright (c) 2015 MediaTek Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/phy/phy.h>
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#define MIPITX_DSI_CON 0x00
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#define RG_DSI_LDOCORE_EN BIT(0)
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#define RG_DSI_CKG_LDOOUT_EN BIT(1)
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#define RG_DSI_BCLK_SEL (3 << 2)
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#define RG_DSI_LD_IDX_SEL (7 << 4)
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#define RG_DSI_PHYCLK_SEL (2 << 8)
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#define RG_DSI_DSICLK_FREQ_SEL BIT(10)
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#define RG_DSI_LPTX_CLMP_EN BIT(11)
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#define MIPITX_DSI_CLOCK_LANE 0x04
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#define MIPITX_DSI_DATA_LANE0 0x08
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#define MIPITX_DSI_DATA_LANE1 0x0c
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#define MIPITX_DSI_DATA_LANE2 0x10
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#define MIPITX_DSI_DATA_LANE3 0x14
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#define RG_DSI_LNTx_LDOOUT_EN BIT(0)
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#define RG_DSI_LNTx_CKLANE_EN BIT(1)
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#define RG_DSI_LNTx_LPTX_IPLUS1 BIT(2)
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#define RG_DSI_LNTx_LPTX_IPLUS2 BIT(3)
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#define RG_DSI_LNTx_LPTX_IMINUS BIT(4)
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#define RG_DSI_LNTx_LPCD_IPLUS BIT(5)
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#define RG_DSI_LNTx_LPCD_IMINUS BIT(6)
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#define RG_DSI_LNTx_RT_CODE (0xf << 8)
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#define MIPITX_DSI_TOP_CON 0x40
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#define RG_DSI_LNT_INTR_EN BIT(0)
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#define RG_DSI_LNT_HS_BIAS_EN BIT(1)
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#define RG_DSI_LNT_IMP_CAL_EN BIT(2)
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#define RG_DSI_LNT_TESTMODE_EN BIT(3)
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#define RG_DSI_LNT_IMP_CAL_CODE (0xf << 4)
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#define RG_DSI_LNT_AIO_SEL (7 << 8)
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#define RG_DSI_PAD_TIE_LOW_EN BIT(11)
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#define RG_DSI_DEBUG_INPUT_EN BIT(12)
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#define RG_DSI_PRESERVE (7 << 13)
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#define MIPITX_DSI_BG_CON 0x44
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#define RG_DSI_BG_CORE_EN BIT(0)
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#define RG_DSI_BG_CKEN BIT(1)
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#define RG_DSI_BG_DIV (0x3 << 2)
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#define RG_DSI_BG_FAST_CHARGE BIT(4)
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#define RG_DSI_VOUT_MSK (0x3ffff << 5)
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#define RG_DSI_V12_SEL (7 << 5)
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#define RG_DSI_V10_SEL (7 << 8)
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#define RG_DSI_V072_SEL (7 << 11)
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#define RG_DSI_V04_SEL (7 << 14)
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#define RG_DSI_V032_SEL (7 << 17)
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#define RG_DSI_V02_SEL (7 << 20)
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#define RG_DSI_BG_R1_TRIM (0xf << 24)
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#define RG_DSI_BG_R2_TRIM (0xf << 28)
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#define MIPITX_DSI_PLL_CON0 0x50
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#define RG_DSI_MPPLL_PLL_EN BIT(0)
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#define RG_DSI_MPPLL_DIV_MSK (0x1ff << 1)
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#define RG_DSI_MPPLL_PREDIV (3 << 1)
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#define RG_DSI_MPPLL_TXDIV0 (3 << 3)
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#define RG_DSI_MPPLL_TXDIV1 (3 << 5)
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#define RG_DSI_MPPLL_POSDIV (7 << 7)
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#define RG_DSI_MPPLL_MONVC_EN BIT(10)
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#define RG_DSI_MPPLL_MONREF_EN BIT(11)
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#define RG_DSI_MPPLL_VOD_EN BIT(12)
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#define MIPITX_DSI_PLL_CON1 0x54
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#define RG_DSI_MPPLL_SDM_FRA_EN BIT(0)
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#define RG_DSI_MPPLL_SDM_SSC_PH_INIT BIT(1)
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#define RG_DSI_MPPLL_SDM_SSC_EN BIT(2)
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#define RG_DSI_MPPLL_SDM_SSC_PRD (0xffff << 16)
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#define MIPITX_DSI_PLL_CON2 0x58
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#define MIPITX_DSI_PLL_TOP 0x64
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#define RG_DSI_MPPLL_PRESERVE (0xff << 8)
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#define MIPITX_DSI_PLL_PWR 0x68
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#define RG_DSI_MPPLL_SDM_PWR_ON BIT(0)
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#define RG_DSI_MPPLL_SDM_ISO_EN BIT(1)
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#define RG_DSI_MPPLL_SDM_PWR_ACK BIT(8)
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#define MIPITX_DSI_SW_CTRL 0x80
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#define SW_CTRL_EN BIT(0)
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#define MIPITX_DSI_SW_CTRL_CON0 0x84
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#define SW_LNTC_LPTX_PRE_OE BIT(0)
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#define SW_LNTC_LPTX_OE BIT(1)
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#define SW_LNTC_LPTX_P BIT(2)
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#define SW_LNTC_LPTX_N BIT(3)
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#define SW_LNTC_HSTX_PRE_OE BIT(4)
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#define SW_LNTC_HSTX_OE BIT(5)
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#define SW_LNTC_HSTX_ZEROCLK BIT(6)
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#define SW_LNT0_LPTX_PRE_OE BIT(7)
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#define SW_LNT0_LPTX_OE BIT(8)
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#define SW_LNT0_LPTX_P BIT(9)
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#define SW_LNT0_LPTX_N BIT(10)
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#define SW_LNT0_HSTX_PRE_OE BIT(11)
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#define SW_LNT0_HSTX_OE BIT(12)
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#define SW_LNT0_LPRX_EN BIT(13)
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#define SW_LNT1_LPTX_PRE_OE BIT(14)
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#define SW_LNT1_LPTX_OE BIT(15)
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#define SW_LNT1_LPTX_P BIT(16)
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#define SW_LNT1_LPTX_N BIT(17)
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#define SW_LNT1_HSTX_PRE_OE BIT(18)
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#define SW_LNT1_HSTX_OE BIT(19)
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#define SW_LNT2_LPTX_PRE_OE BIT(20)
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#define SW_LNT2_LPTX_OE BIT(21)
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#define SW_LNT2_LPTX_P BIT(22)
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#define SW_LNT2_LPTX_N BIT(23)
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#define SW_LNT2_HSTX_PRE_OE BIT(24)
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#define SW_LNT2_HSTX_OE BIT(25)
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struct mtk_mipitx_data {
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const u32 mppll_preserve;
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};
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struct mtk_mipi_tx {
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struct device *dev;
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void __iomem *regs;
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u32 data_rate;
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const struct mtk_mipitx_data *driver_data;
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struct clk_hw pll_hw;
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struct clk *pll;
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};
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static inline struct mtk_mipi_tx *mtk_mipi_tx_from_clk_hw(struct clk_hw *hw)
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{
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return container_of(hw, struct mtk_mipi_tx, pll_hw);
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}
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static void mtk_mipi_tx_clear_bits(struct mtk_mipi_tx *mipi_tx, u32 offset,
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u32 bits)
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{
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u32 temp = readl(mipi_tx->regs + offset);
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writel(temp & ~bits, mipi_tx->regs + offset);
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}
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static void mtk_mipi_tx_set_bits(struct mtk_mipi_tx *mipi_tx, u32 offset,
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u32 bits)
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{
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u32 temp = readl(mipi_tx->regs + offset);
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writel(temp | bits, mipi_tx->regs + offset);
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}
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static void mtk_mipi_tx_update_bits(struct mtk_mipi_tx *mipi_tx, u32 offset,
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u32 mask, u32 data)
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{
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u32 temp = readl(mipi_tx->regs + offset);
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writel((temp & ~mask) | (data & mask), mipi_tx->regs + offset);
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}
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static int mtk_mipi_tx_pll_prepare(struct clk_hw *hw)
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{
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struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);
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u8 txdiv, txdiv0, txdiv1;
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u64 pcw;
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dev_dbg(mipi_tx->dev, "prepare: %u Hz\n", mipi_tx->data_rate);
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if (mipi_tx->data_rate >= 500000000) {
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txdiv = 1;
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txdiv0 = 0;
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txdiv1 = 0;
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} else if (mipi_tx->data_rate >= 250000000) {
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txdiv = 2;
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txdiv0 = 1;
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txdiv1 = 0;
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} else if (mipi_tx->data_rate >= 125000000) {
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txdiv = 4;
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txdiv0 = 2;
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txdiv1 = 0;
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} else if (mipi_tx->data_rate > 62000000) {
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txdiv = 8;
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txdiv0 = 2;
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txdiv1 = 1;
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} else if (mipi_tx->data_rate >= 50000000) {
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txdiv = 16;
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txdiv0 = 2;
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txdiv1 = 2;
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} else {
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return -EINVAL;
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}
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mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_BG_CON,
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RG_DSI_VOUT_MSK |
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RG_DSI_BG_CKEN | RG_DSI_BG_CORE_EN,
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(4 << 20) | (4 << 17) | (4 << 14) |
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(4 << 11) | (4 << 8) | (4 << 5) |
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RG_DSI_BG_CKEN | RG_DSI_BG_CORE_EN);
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usleep_range(30, 100);
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mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_TOP_CON,
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RG_DSI_LNT_IMP_CAL_CODE | RG_DSI_LNT_HS_BIAS_EN,
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(8 << 4) | RG_DSI_LNT_HS_BIAS_EN);
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mtk_mipi_tx_set_bits(mipi_tx, MIPITX_DSI_CON,
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RG_DSI_CKG_LDOOUT_EN | RG_DSI_LDOCORE_EN);
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mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_PLL_PWR,
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RG_DSI_MPPLL_SDM_PWR_ON |
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RG_DSI_MPPLL_SDM_ISO_EN,
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RG_DSI_MPPLL_SDM_PWR_ON);
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mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_DSI_PLL_CON0,
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RG_DSI_MPPLL_PLL_EN);
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mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_PLL_CON0,
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RG_DSI_MPPLL_TXDIV0 | RG_DSI_MPPLL_TXDIV1 |
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RG_DSI_MPPLL_PREDIV,
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(txdiv0 << 3) | (txdiv1 << 5));
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/*
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* PLL PCW config
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* PCW bit 24~30 = integer part of pcw
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* PCW bit 0~23 = fractional part of pcw
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* pcw = data_Rate*4*txdiv/(Ref_clk*2);
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* Post DIV =4, so need data_Rate*4
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* Ref_clk is 26MHz
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*/
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pcw = div_u64(((u64)mipi_tx->data_rate * 2 * txdiv) << 24,
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26000000);
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writel(pcw, mipi_tx->regs + MIPITX_DSI_PLL_CON2);
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mtk_mipi_tx_set_bits(mipi_tx, MIPITX_DSI_PLL_CON1,
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RG_DSI_MPPLL_SDM_FRA_EN);
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mtk_mipi_tx_set_bits(mipi_tx, MIPITX_DSI_PLL_CON0, RG_DSI_MPPLL_PLL_EN);
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usleep_range(20, 100);
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mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_DSI_PLL_CON1,
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RG_DSI_MPPLL_SDM_SSC_EN);
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mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_PLL_TOP,
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RG_DSI_MPPLL_PRESERVE,
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mipi_tx->driver_data->mppll_preserve);
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return 0;
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}
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static void mtk_mipi_tx_pll_unprepare(struct clk_hw *hw)
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{
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struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);
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dev_dbg(mipi_tx->dev, "unprepare\n");
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mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_DSI_PLL_CON0,
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RG_DSI_MPPLL_PLL_EN);
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mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_PLL_TOP,
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RG_DSI_MPPLL_PRESERVE, 0);
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mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_PLL_PWR,
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RG_DSI_MPPLL_SDM_ISO_EN |
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RG_DSI_MPPLL_SDM_PWR_ON,
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RG_DSI_MPPLL_SDM_ISO_EN);
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mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_DSI_TOP_CON,
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RG_DSI_LNT_HS_BIAS_EN);
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mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_DSI_CON,
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RG_DSI_CKG_LDOOUT_EN | RG_DSI_LDOCORE_EN);
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mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_DSI_BG_CON,
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RG_DSI_BG_CKEN | RG_DSI_BG_CORE_EN);
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mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_DSI_PLL_CON0,
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RG_DSI_MPPLL_DIV_MSK);
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}
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static long mtk_mipi_tx_pll_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *prate)
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{
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return clamp_val(rate, 50000000, 1250000000);
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}
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static int mtk_mipi_tx_pll_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);
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dev_dbg(mipi_tx->dev, "set rate: %lu Hz\n", rate);
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mipi_tx->data_rate = rate;
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return 0;
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}
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static unsigned long mtk_mipi_tx_pll_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);
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return mipi_tx->data_rate;
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}
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static const struct clk_ops mtk_mipi_tx_pll_ops = {
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.prepare = mtk_mipi_tx_pll_prepare,
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.unprepare = mtk_mipi_tx_pll_unprepare,
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.round_rate = mtk_mipi_tx_pll_round_rate,
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.set_rate = mtk_mipi_tx_pll_set_rate,
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.recalc_rate = mtk_mipi_tx_pll_recalc_rate,
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};
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static int mtk_mipi_tx_power_on_signal(struct phy *phy)
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{
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struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
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u32 reg;
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for (reg = MIPITX_DSI_CLOCK_LANE;
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reg <= MIPITX_DSI_DATA_LANE3; reg += 4)
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mtk_mipi_tx_set_bits(mipi_tx, reg, RG_DSI_LNTx_LDOOUT_EN);
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mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_DSI_TOP_CON,
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RG_DSI_PAD_TIE_LOW_EN);
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return 0;
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}
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static int mtk_mipi_tx_power_on(struct phy *phy)
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{
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struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
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int ret;
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/* Power up core and enable PLL */
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ret = clk_prepare_enable(mipi_tx->pll);
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if (ret < 0)
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return ret;
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/* Enable DSI Lane LDO outputs, disable pad tie low */
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mtk_mipi_tx_power_on_signal(phy);
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return 0;
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}
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static void mtk_mipi_tx_power_off_signal(struct phy *phy)
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{
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struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
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u32 reg;
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mtk_mipi_tx_set_bits(mipi_tx, MIPITX_DSI_TOP_CON,
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RG_DSI_PAD_TIE_LOW_EN);
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for (reg = MIPITX_DSI_CLOCK_LANE;
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reg <= MIPITX_DSI_DATA_LANE3; reg += 4)
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mtk_mipi_tx_clear_bits(mipi_tx, reg, RG_DSI_LNTx_LDOOUT_EN);
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}
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static int mtk_mipi_tx_power_off(struct phy *phy)
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{
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struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
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/* Enable pad tie low, disable DSI Lane LDO outputs */
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mtk_mipi_tx_power_off_signal(phy);
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/* Disable PLL and power down core */
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clk_disable_unprepare(mipi_tx->pll);
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return 0;
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}
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static const struct phy_ops mtk_mipi_tx_ops = {
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.power_on = mtk_mipi_tx_power_on,
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.power_off = mtk_mipi_tx_power_off,
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.owner = THIS_MODULE,
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};
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static int mtk_mipi_tx_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct mtk_mipi_tx *mipi_tx;
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struct resource *mem;
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struct clk *ref_clk;
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const char *ref_clk_name;
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struct clk_init_data clk_init = {
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.ops = &mtk_mipi_tx_pll_ops,
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.num_parents = 1,
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.parent_names = (const char * const *)&ref_clk_name,
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.flags = CLK_SET_RATE_GATE,
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};
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struct phy *phy;
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struct phy_provider *phy_provider;
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int ret;
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mipi_tx = devm_kzalloc(dev, sizeof(*mipi_tx), GFP_KERNEL);
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if (!mipi_tx)
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return -ENOMEM;
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mipi_tx->driver_data = of_device_get_match_data(dev);
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
mipi_tx->regs = devm_ioremap_resource(dev, mem);
|
|
if (IS_ERR(mipi_tx->regs)) {
|
|
ret = PTR_ERR(mipi_tx->regs);
|
|
dev_err(dev, "Failed to get memory resource: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ref_clk = devm_clk_get(dev, NULL);
|
|
if (IS_ERR(ref_clk)) {
|
|
ret = PTR_ERR(ref_clk);
|
|
dev_err(dev, "Failed to get reference clock: %d\n", ret);
|
|
return ret;
|
|
}
|
|
ref_clk_name = __clk_get_name(ref_clk);
|
|
|
|
ret = of_property_read_string(dev->of_node, "clock-output-names",
|
|
&clk_init.name);
|
|
if (ret < 0) {
|
|
dev_err(dev, "Failed to read clock-output-names: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
mipi_tx->pll_hw.init = &clk_init;
|
|
mipi_tx->pll = devm_clk_register(dev, &mipi_tx->pll_hw);
|
|
if (IS_ERR(mipi_tx->pll)) {
|
|
ret = PTR_ERR(mipi_tx->pll);
|
|
dev_err(dev, "Failed to register PLL: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
phy = devm_phy_create(dev, NULL, &mtk_mipi_tx_ops);
|
|
if (IS_ERR(phy)) {
|
|
ret = PTR_ERR(phy);
|
|
dev_err(dev, "Failed to create MIPI D-PHY: %d\n", ret);
|
|
return ret;
|
|
}
|
|
phy_set_drvdata(phy, mipi_tx);
|
|
|
|
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
|
|
if (IS_ERR(phy_provider)) {
|
|
ret = PTR_ERR(phy_provider);
|
|
return ret;
|
|
}
|
|
|
|
mipi_tx->dev = dev;
|
|
|
|
return of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
|
|
mipi_tx->pll);
|
|
}
|
|
|
|
static int mtk_mipi_tx_remove(struct platform_device *pdev)
|
|
{
|
|
of_clk_del_provider(pdev->dev.of_node);
|
|
return 0;
|
|
}
|
|
|
|
static const struct mtk_mipitx_data mt2701_mipitx_data = {
|
|
.mppll_preserve = (3 << 8)
|
|
};
|
|
|
|
static const struct mtk_mipitx_data mt8173_mipitx_data = {
|
|
.mppll_preserve = (0 << 8)
|
|
};
|
|
|
|
static const struct of_device_id mtk_mipi_tx_match[] = {
|
|
{ .compatible = "mediatek,mt2701-mipi-tx",
|
|
.data = &mt2701_mipitx_data },
|
|
{ .compatible = "mediatek,mt8173-mipi-tx",
|
|
.data = &mt8173_mipitx_data },
|
|
{},
|
|
};
|
|
|
|
struct platform_driver mtk_mipi_tx_driver = {
|
|
.probe = mtk_mipi_tx_probe,
|
|
.remove = mtk_mipi_tx_remove,
|
|
.driver = {
|
|
.name = "mediatek-mipi-tx",
|
|
.of_match_table = mtk_mipi_tx_match,
|
|
},
|
|
};
|