373 lines
12 KiB
C
373 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Meson G12A USB2 PHY driver
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*
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* Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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* Copyright (C) 2017 Amlogic, Inc. All rights reserved
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* Copyright (C) 2019 BayLibre, SAS
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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*/
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#include <linux/bitfield.h>
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#include <linux/bitops.h>
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#include <linux/clk.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/regmap.h>
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#include <linux/reset.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#define PHY_CTRL_R0 0x0
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#define PHY_CTRL_R1 0x4
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#define PHY_CTRL_R2 0x8
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#define PHY_CTRL_R3 0xc
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#define PHY_CTRL_R3_SQUELCH_REF GENMASK(1, 0)
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#define PHY_CTRL_R3_HSDIC_REF GENMASK(3, 2)
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#define PHY_CTRL_R3_DISC_THRESH GENMASK(7, 4)
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#define PHY_CTRL_R4 0x10
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#define PHY_CTRL_R4_CALIB_CODE_7_0 GENMASK(7, 0)
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#define PHY_CTRL_R4_CALIB_CODE_15_8 GENMASK(15, 8)
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#define PHY_CTRL_R4_CALIB_CODE_23_16 GENMASK(23, 16)
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#define PHY_CTRL_R4_I_C2L_CAL_EN BIT(24)
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#define PHY_CTRL_R4_I_C2L_CAL_RESET_N BIT(25)
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#define PHY_CTRL_R4_I_C2L_CAL_DONE BIT(26)
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#define PHY_CTRL_R4_TEST_BYPASS_MODE_EN BIT(27)
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#define PHY_CTRL_R4_I_C2L_BIAS_TRIM_1_0 GENMASK(29, 28)
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#define PHY_CTRL_R4_I_C2L_BIAS_TRIM_3_2 GENMASK(31, 30)
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#define PHY_CTRL_R5 0x14
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#define PHY_CTRL_R6 0x18
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#define PHY_CTRL_R7 0x1c
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#define PHY_CTRL_R8 0x20
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#define PHY_CTRL_R9 0x24
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#define PHY_CTRL_R10 0x28
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#define PHY_CTRL_R11 0x2c
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#define PHY_CTRL_R12 0x30
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#define PHY_CTRL_R13 0x34
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#define PHY_CTRL_R13_CUSTOM_PATTERN_19 GENMASK(7, 0)
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#define PHY_CTRL_R13_LOAD_STAT BIT(14)
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#define PHY_CTRL_R13_UPDATE_PMA_SIGNALS BIT(15)
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#define PHY_CTRL_R13_MIN_COUNT_FOR_SYNC_DET GENMASK(20, 16)
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#define PHY_CTRL_R13_CLEAR_HOLD_HS_DISCONNECT BIT(21)
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#define PHY_CTRL_R13_BYPASS_HOST_DISCONNECT_VAL BIT(22)
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#define PHY_CTRL_R13_BYPASS_HOST_DISCONNECT_EN BIT(23)
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#define PHY_CTRL_R13_I_C2L_HS_EN BIT(24)
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#define PHY_CTRL_R13_I_C2L_FS_EN BIT(25)
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#define PHY_CTRL_R13_I_C2L_LS_EN BIT(26)
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#define PHY_CTRL_R13_I_C2L_HS_OE BIT(27)
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#define PHY_CTRL_R13_I_C2L_FS_OE BIT(28)
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#define PHY_CTRL_R13_I_C2L_HS_RX_EN BIT(29)
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#define PHY_CTRL_R13_I_C2L_FSLS_RX_EN BIT(30)
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#define PHY_CTRL_R14 0x38
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#define PHY_CTRL_R14_I_RDP_EN BIT(0)
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#define PHY_CTRL_R14_I_RPU_SW1_EN BIT(1)
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#define PHY_CTRL_R14_I_RPU_SW2_EN GENMASK(3, 2)
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#define PHY_CTRL_R14_PG_RSTN BIT(4)
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#define PHY_CTRL_R14_I_C2L_DATA_16_8 BIT(5)
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#define PHY_CTRL_R14_I_C2L_ASSERT_SINGLE_EN_ZERO BIT(6)
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#define PHY_CTRL_R14_BYPASS_CTRL_7_0 GENMASK(15, 8)
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#define PHY_CTRL_R14_BYPASS_CTRL_15_8 GENMASK(23, 16)
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#define PHY_CTRL_R15 0x3c
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#define PHY_CTRL_R16 0x40
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#define PHY_CTRL_R16_MPLL_M GENMASK(8, 0)
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#define PHY_CTRL_R16_MPLL_N GENMASK(14, 10)
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#define PHY_CTRL_R16_MPLL_TDC_MODE BIT(20)
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#define PHY_CTRL_R16_MPLL_SDM_EN BIT(21)
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#define PHY_CTRL_R16_MPLL_LOAD BIT(22)
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#define PHY_CTRL_R16_MPLL_DCO_SDM_EN BIT(23)
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#define PHY_CTRL_R16_MPLL_LOCK_LONG GENMASK(25, 24)
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#define PHY_CTRL_R16_MPLL_LOCK_F BIT(26)
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#define PHY_CTRL_R16_MPLL_FAST_LOCK BIT(27)
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#define PHY_CTRL_R16_MPLL_EN BIT(28)
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#define PHY_CTRL_R16_MPLL_RESET BIT(29)
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#define PHY_CTRL_R16_MPLL_LOCK BIT(30)
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#define PHY_CTRL_R16_MPLL_LOCK_DIG BIT(31)
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#define PHY_CTRL_R17 0x44
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#define PHY_CTRL_R17_MPLL_FRAC_IN GENMASK(13, 0)
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#define PHY_CTRL_R17_MPLL_FIX_EN BIT(16)
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#define PHY_CTRL_R17_MPLL_LAMBDA1 GENMASK(19, 17)
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#define PHY_CTRL_R17_MPLL_LAMBDA0 GENMASK(22, 20)
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#define PHY_CTRL_R17_MPLL_FILTER_MODE BIT(23)
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#define PHY_CTRL_R17_MPLL_FILTER_PVT2 GENMASK(27, 24)
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#define PHY_CTRL_R17_MPLL_FILTER_PVT1 GENMASK(31, 28)
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#define PHY_CTRL_R18 0x48
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#define PHY_CTRL_R18_MPLL_LKW_SEL GENMASK(1, 0)
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#define PHY_CTRL_R18_MPLL_LK_W GENMASK(5, 2)
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#define PHY_CTRL_R18_MPLL_LK_S GENMASK(11, 6)
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#define PHY_CTRL_R18_MPLL_DCO_M_EN BIT(12)
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#define PHY_CTRL_R18_MPLL_DCO_CLK_SEL BIT(13)
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#define PHY_CTRL_R18_MPLL_PFD_GAIN GENMASK(15, 14)
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#define PHY_CTRL_R18_MPLL_ROU GENMASK(18, 16)
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#define PHY_CTRL_R18_MPLL_DATA_SEL GENMASK(21, 19)
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#define PHY_CTRL_R18_MPLL_BIAS_ADJ GENMASK(23, 22)
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#define PHY_CTRL_R18_MPLL_BB_MODE GENMASK(25, 24)
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#define PHY_CTRL_R18_MPLL_ALPHA GENMASK(28, 26)
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#define PHY_CTRL_R18_MPLL_ADJ_LDO GENMASK(30, 29)
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#define PHY_CTRL_R18_MPLL_ACG_RANGE BIT(31)
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#define PHY_CTRL_R19 0x4c
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#define PHY_CTRL_R20 0x50
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#define PHY_CTRL_R20_USB2_IDDET_EN BIT(0)
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#define PHY_CTRL_R20_USB2_OTG_VBUS_TRIM_2_0 GENMASK(3, 1)
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#define PHY_CTRL_R20_USB2_OTG_VBUSDET_EN BIT(4)
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#define PHY_CTRL_R20_USB2_AMON_EN BIT(5)
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#define PHY_CTRL_R20_USB2_CAL_CODE_R5 BIT(6)
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#define PHY_CTRL_R20_BYPASS_OTG_DET BIT(7)
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#define PHY_CTRL_R20_USB2_DMON_EN BIT(8)
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#define PHY_CTRL_R20_USB2_DMON_SEL_3_0 GENMASK(12, 9)
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#define PHY_CTRL_R20_USB2_EDGE_DRV_EN BIT(13)
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#define PHY_CTRL_R20_USB2_EDGE_DRV_TRIM_1_0 GENMASK(15, 14)
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#define PHY_CTRL_R20_USB2_BGR_ADJ_4_0 GENMASK(20, 16)
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#define PHY_CTRL_R20_USB2_BGR_START BIT(21)
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#define PHY_CTRL_R20_USB2_BGR_VREF_4_0 GENMASK(28, 24)
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#define PHY_CTRL_R20_USB2_BGR_DBG_1_0 GENMASK(30, 29)
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#define PHY_CTRL_R20_BYPASS_CAL_DONE_R5 BIT(31)
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#define PHY_CTRL_R21 0x54
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#define PHY_CTRL_R21_USB2_BGR_FORCE BIT(0)
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#define PHY_CTRL_R21_USB2_CAL_ACK_EN BIT(1)
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#define PHY_CTRL_R21_USB2_OTG_ACA_EN BIT(2)
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#define PHY_CTRL_R21_USB2_TX_STRG_PD BIT(3)
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#define PHY_CTRL_R21_USB2_OTG_ACA_TRIM_1_0 GENMASK(5, 4)
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#define PHY_CTRL_R21_BYPASS_UTMI_CNTR GENMASK(15, 6)
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#define PHY_CTRL_R21_BYPASS_UTMI_REG GENMASK(25, 20)
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#define PHY_CTRL_R22 0x58
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#define PHY_CTRL_R23 0x5c
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#define RESET_COMPLETE_TIME 1000
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#define PLL_RESET_COMPLETE_TIME 100
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enum meson_soc_id {
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MESON_SOC_G12A = 0,
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MESON_SOC_A1,
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};
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struct phy_meson_g12a_usb2_priv {
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struct device *dev;
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struct regmap *regmap;
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struct clk *clk;
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struct reset_control *reset;
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int soc_id;
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};
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static const struct regmap_config phy_meson_g12a_usb2_regmap_conf = {
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.reg_bits = 8,
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.val_bits = 32,
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.reg_stride = 4,
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.max_register = PHY_CTRL_R23,
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};
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static int phy_meson_g12a_usb2_init(struct phy *phy)
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{
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struct phy_meson_g12a_usb2_priv *priv = phy_get_drvdata(phy);
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int ret;
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unsigned int value;
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ret = reset_control_reset(priv->reset);
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if (ret)
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return ret;
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udelay(RESET_COMPLETE_TIME);
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/* usb2_otg_aca_en == 0 */
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regmap_update_bits(priv->regmap, PHY_CTRL_R21,
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PHY_CTRL_R21_USB2_OTG_ACA_EN, 0);
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/* PLL Setup : 24MHz * 20 / 1 = 480MHz */
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regmap_write(priv->regmap, PHY_CTRL_R16,
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FIELD_PREP(PHY_CTRL_R16_MPLL_M, 20) |
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FIELD_PREP(PHY_CTRL_R16_MPLL_N, 1) |
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PHY_CTRL_R16_MPLL_LOAD |
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FIELD_PREP(PHY_CTRL_R16_MPLL_LOCK_LONG, 1) |
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PHY_CTRL_R16_MPLL_FAST_LOCK |
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PHY_CTRL_R16_MPLL_EN |
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PHY_CTRL_R16_MPLL_RESET);
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regmap_write(priv->regmap, PHY_CTRL_R17,
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FIELD_PREP(PHY_CTRL_R17_MPLL_FRAC_IN, 0) |
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FIELD_PREP(PHY_CTRL_R17_MPLL_LAMBDA1, 7) |
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FIELD_PREP(PHY_CTRL_R17_MPLL_LAMBDA0, 7) |
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FIELD_PREP(PHY_CTRL_R17_MPLL_FILTER_PVT2, 2) |
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FIELD_PREP(PHY_CTRL_R17_MPLL_FILTER_PVT1, 9));
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value = FIELD_PREP(PHY_CTRL_R18_MPLL_LKW_SEL, 1) |
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FIELD_PREP(PHY_CTRL_R18_MPLL_LK_W, 9) |
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FIELD_PREP(PHY_CTRL_R18_MPLL_LK_S, 0x27) |
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FIELD_PREP(PHY_CTRL_R18_MPLL_PFD_GAIN, 1) |
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FIELD_PREP(PHY_CTRL_R18_MPLL_ROU, 7) |
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FIELD_PREP(PHY_CTRL_R18_MPLL_DATA_SEL, 3) |
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FIELD_PREP(PHY_CTRL_R18_MPLL_BIAS_ADJ, 1) |
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FIELD_PREP(PHY_CTRL_R18_MPLL_BB_MODE, 0) |
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FIELD_PREP(PHY_CTRL_R18_MPLL_ALPHA, 3) |
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FIELD_PREP(PHY_CTRL_R18_MPLL_ADJ_LDO, 1) |
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PHY_CTRL_R18_MPLL_ACG_RANGE;
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if (priv->soc_id == MESON_SOC_A1)
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value |= PHY_CTRL_R18_MPLL_DCO_CLK_SEL;
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regmap_write(priv->regmap, PHY_CTRL_R18, value);
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udelay(PLL_RESET_COMPLETE_TIME);
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/* UnReset PLL */
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regmap_write(priv->regmap, PHY_CTRL_R16,
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FIELD_PREP(PHY_CTRL_R16_MPLL_M, 20) |
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FIELD_PREP(PHY_CTRL_R16_MPLL_N, 1) |
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PHY_CTRL_R16_MPLL_LOAD |
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FIELD_PREP(PHY_CTRL_R16_MPLL_LOCK_LONG, 1) |
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PHY_CTRL_R16_MPLL_FAST_LOCK |
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PHY_CTRL_R16_MPLL_EN);
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/* PHY Tuning */
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regmap_write(priv->regmap, PHY_CTRL_R20,
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FIELD_PREP(PHY_CTRL_R20_USB2_OTG_VBUS_TRIM_2_0, 4) |
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PHY_CTRL_R20_USB2_OTG_VBUSDET_EN |
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FIELD_PREP(PHY_CTRL_R20_USB2_DMON_SEL_3_0, 15) |
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PHY_CTRL_R20_USB2_EDGE_DRV_EN |
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FIELD_PREP(PHY_CTRL_R20_USB2_EDGE_DRV_TRIM_1_0, 3) |
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FIELD_PREP(PHY_CTRL_R20_USB2_BGR_ADJ_4_0, 0) |
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FIELD_PREP(PHY_CTRL_R20_USB2_BGR_VREF_4_0, 0) |
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FIELD_PREP(PHY_CTRL_R20_USB2_BGR_DBG_1_0, 0));
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if (priv->soc_id == MESON_SOC_G12A)
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regmap_write(priv->regmap, PHY_CTRL_R4,
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FIELD_PREP(PHY_CTRL_R4_CALIB_CODE_7_0, 0xf) |
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FIELD_PREP(PHY_CTRL_R4_CALIB_CODE_15_8, 0xf) |
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FIELD_PREP(PHY_CTRL_R4_CALIB_CODE_23_16, 0xf) |
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PHY_CTRL_R4_TEST_BYPASS_MODE_EN |
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FIELD_PREP(PHY_CTRL_R4_I_C2L_BIAS_TRIM_1_0, 0) |
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FIELD_PREP(PHY_CTRL_R4_I_C2L_BIAS_TRIM_3_2, 0));
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else if (priv->soc_id == MESON_SOC_A1) {
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regmap_write(priv->regmap, PHY_CTRL_R21,
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PHY_CTRL_R21_USB2_CAL_ACK_EN |
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PHY_CTRL_R21_USB2_TX_STRG_PD |
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FIELD_PREP(PHY_CTRL_R21_USB2_OTG_ACA_TRIM_1_0, 2));
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/* Analog Settings */
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regmap_write(priv->regmap, PHY_CTRL_R13,
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FIELD_PREP(PHY_CTRL_R13_MIN_COUNT_FOR_SYNC_DET, 7));
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}
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/* Tuning Disconnect Threshold */
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regmap_write(priv->regmap, PHY_CTRL_R3,
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FIELD_PREP(PHY_CTRL_R3_SQUELCH_REF, 0) |
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FIELD_PREP(PHY_CTRL_R3_HSDIC_REF, 1) |
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FIELD_PREP(PHY_CTRL_R3_DISC_THRESH, 3));
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if (priv->soc_id == MESON_SOC_G12A) {
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/* Analog Settings */
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regmap_write(priv->regmap, PHY_CTRL_R14, 0);
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regmap_write(priv->regmap, PHY_CTRL_R13,
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PHY_CTRL_R13_UPDATE_PMA_SIGNALS |
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FIELD_PREP(PHY_CTRL_R13_MIN_COUNT_FOR_SYNC_DET, 7));
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}
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return 0;
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}
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static int phy_meson_g12a_usb2_exit(struct phy *phy)
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{
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struct phy_meson_g12a_usb2_priv *priv = phy_get_drvdata(phy);
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return reset_control_reset(priv->reset);
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}
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/* set_mode is not needed, mode setting is handled via the UTMI bus */
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static const struct phy_ops phy_meson_g12a_usb2_ops = {
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.init = phy_meson_g12a_usb2_init,
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.exit = phy_meson_g12a_usb2_exit,
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.owner = THIS_MODULE,
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};
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static int phy_meson_g12a_usb2_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct phy_provider *phy_provider;
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struct phy_meson_g12a_usb2_priv *priv;
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struct phy *phy;
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void __iomem *base;
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int ret;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->dev = dev;
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platform_set_drvdata(pdev, priv);
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base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(base))
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return PTR_ERR(base);
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priv->soc_id = (enum meson_soc_id)of_device_get_match_data(&pdev->dev);
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priv->regmap = devm_regmap_init_mmio(dev, base,
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&phy_meson_g12a_usb2_regmap_conf);
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if (IS_ERR(priv->regmap))
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return PTR_ERR(priv->regmap);
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priv->clk = devm_clk_get(dev, "xtal");
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if (IS_ERR(priv->clk))
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return PTR_ERR(priv->clk);
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priv->reset = devm_reset_control_get(dev, "phy");
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if (IS_ERR(priv->reset))
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return PTR_ERR(priv->reset);
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ret = reset_control_deassert(priv->reset);
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if (ret)
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return ret;
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phy = devm_phy_create(dev, NULL, &phy_meson_g12a_usb2_ops);
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if (IS_ERR(phy)) {
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ret = PTR_ERR(phy);
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if (ret != -EPROBE_DEFER)
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dev_err(dev, "failed to create PHY\n");
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return ret;
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}
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phy_set_bus_width(phy, 8);
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phy_set_drvdata(phy, priv);
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phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
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return PTR_ERR_OR_ZERO(phy_provider);
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}
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static const struct of_device_id phy_meson_g12a_usb2_of_match[] = {
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{
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.compatible = "amlogic,g12a-usb2-phy",
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.data = (void *)MESON_SOC_G12A,
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},
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{
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.compatible = "amlogic,a1-usb2-phy",
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.data = (void *)MESON_SOC_A1,
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},
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{ /* Sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, phy_meson_g12a_usb2_of_match);
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static struct platform_driver phy_meson_g12a_usb2_driver = {
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.probe = phy_meson_g12a_usb2_probe,
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.driver = {
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.name = "phy-meson-g12a-usb2",
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.of_match_table = phy_meson_g12a_usb2_of_match,
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},
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};
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module_platform_driver(phy_meson_g12a_usb2_driver);
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MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
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MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
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MODULE_DESCRIPTION("Meson G12A USB2 PHY driver");
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MODULE_LICENSE("GPL v2");
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