311 lines
8.4 KiB
C
311 lines
8.4 KiB
C
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/*
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* Meson GXL and GXM USB2 PHY driver
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*
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* Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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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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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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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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/* bits [31:27] are read-only */
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#define U2P_R0 0x0
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#define U2P_R0_BYPASS_SEL BIT(0)
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#define U2P_R0_BYPASS_DM_EN BIT(1)
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#define U2P_R0_BYPASS_DP_EN BIT(2)
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#define U2P_R0_TXBITSTUFF_ENH BIT(3)
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#define U2P_R0_TXBITSTUFF_EN BIT(4)
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#define U2P_R0_DM_PULLDOWN BIT(5)
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#define U2P_R0_DP_PULLDOWN BIT(6)
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#define U2P_R0_DP_VBUS_VLD_EXT_SEL BIT(7)
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#define U2P_R0_DP_VBUS_VLD_EXT BIT(8)
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#define U2P_R0_ADP_PRB_EN BIT(9)
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#define U2P_R0_ADP_DISCHARGE BIT(10)
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#define U2P_R0_ADP_CHARGE BIT(11)
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#define U2P_R0_DRV_VBUS BIT(12)
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#define U2P_R0_ID_PULLUP BIT(13)
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#define U2P_R0_LOOPBACK_EN_B BIT(14)
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#define U2P_R0_OTG_DISABLE BIT(15)
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#define U2P_R0_COMMON_ONN BIT(16)
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#define U2P_R0_FSEL_MASK GENMASK(19, 17)
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#define U2P_R0_REF_CLK_SEL_MASK GENMASK(21, 20)
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#define U2P_R0_POWER_ON_RESET BIT(22)
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#define U2P_R0_V_ATE_TEST_EN_B_MASK GENMASK(24, 23)
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#define U2P_R0_ID_SET_ID_DQ BIT(25)
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#define U2P_R0_ATE_RESET BIT(26)
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#define U2P_R0_FSV_MINUS BIT(27)
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#define U2P_R0_FSV_PLUS BIT(28)
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#define U2P_R0_BYPASS_DM_DATA BIT(29)
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#define U2P_R0_BYPASS_DP_DATA BIT(30)
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#define U2P_R1 0x4
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#define U2P_R1_BURN_IN_TEST BIT(0)
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#define U2P_R1_ACA_ENABLE BIT(1)
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#define U2P_R1_DCD_ENABLE BIT(2)
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#define U2P_R1_VDAT_SRC_EN_B BIT(3)
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#define U2P_R1_VDAT_DET_EN_B BIT(4)
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#define U2P_R1_CHARGES_SEL BIT(5)
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#define U2P_R1_TX_PREEMP_PULSE_TUNE BIT(6)
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#define U2P_R1_TX_PREEMP_AMP_TUNE_MASK GENMASK(8, 7)
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#define U2P_R1_TX_RES_TUNE_MASK GENMASK(10, 9)
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#define U2P_R1_TX_RISE_TUNE_MASK GENMASK(12, 11)
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#define U2P_R1_TX_VREF_TUNE_MASK GENMASK(16, 13)
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#define U2P_R1_TX_FSLS_TUNE_MASK GENMASK(20, 17)
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#define U2P_R1_TX_HSXV_TUNE_MASK GENMASK(22, 21)
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#define U2P_R1_OTG_TUNE_MASK GENMASK(25, 23)
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#define U2P_R1_SQRX_TUNE_MASK GENMASK(28, 26)
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#define U2P_R1_COMP_DIS_TUNE_MASK GENMASK(31, 29)
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/* bits [31:14] are read-only */
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#define U2P_R2 0x8
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#define U2P_R2_TESTDATA_IN_MASK GENMASK(7, 0)
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#define U2P_R2_TESTADDR_MASK GENMASK(11, 8)
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#define U2P_R2_TESTDATA_OUT_SEL BIT(12)
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#define U2P_R2_TESTCLK BIT(13)
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#define U2P_R2_TESTDATA_OUT_MASK GENMASK(17, 14)
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#define U2P_R2_ACA_PIN_RANGE_C BIT(18)
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#define U2P_R2_ACA_PIN_RANGE_B BIT(19)
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#define U2P_R2_ACA_PIN_RANGE_A BIT(20)
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#define U2P_R2_ACA_PIN_GND BIT(21)
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#define U2P_R2_ACA_PIN_FLOAT BIT(22)
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#define U2P_R2_CHARGE_DETECT BIT(23)
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#define U2P_R2_DEVICE_SESSION_VALID BIT(24)
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#define U2P_R2_ADP_PROBE BIT(25)
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#define U2P_R2_ADP_SENSE BIT(26)
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#define U2P_R2_SESSION_END BIT(27)
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#define U2P_R2_VBUS_VALID BIT(28)
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#define U2P_R2_B_VALID BIT(29)
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#define U2P_R2_A_VALID BIT(30)
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#define U2P_R2_ID_DIG BIT(31)
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#define U2P_R3 0xc
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#define RESET_COMPLETE_TIME 500
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struct phy_meson_gxl_usb2_priv {
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struct regmap *regmap;
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enum phy_mode mode;
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int is_enabled;
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struct clk *clk;
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struct reset_control *reset;
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};
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static const struct regmap_config phy_meson_gxl_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 = U2P_R3,
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};
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static int phy_meson_gxl_usb2_init(struct phy *phy)
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{
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struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);
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int ret;
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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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ret = clk_prepare_enable(priv->clk);
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if (ret)
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return ret;
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return 0;
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}
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static int phy_meson_gxl_usb2_exit(struct phy *phy)
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{
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struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);
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clk_disable_unprepare(priv->clk);
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return 0;
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}
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static int phy_meson_gxl_usb2_reset(struct phy *phy)
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{
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struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);
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if (priv->is_enabled) {
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/* reset the PHY and wait until settings are stabilized */
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regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,
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U2P_R0_POWER_ON_RESET);
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udelay(RESET_COMPLETE_TIME);
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regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,
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0);
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udelay(RESET_COMPLETE_TIME);
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}
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return 0;
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}
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static int phy_meson_gxl_usb2_set_mode(struct phy *phy,
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enum phy_mode mode, int submode)
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{
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struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);
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switch (mode) {
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case PHY_MODE_USB_HOST:
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case PHY_MODE_USB_OTG:
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regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DM_PULLDOWN,
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U2P_R0_DM_PULLDOWN);
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regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DP_PULLDOWN,
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U2P_R0_DP_PULLDOWN);
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regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_ID_PULLUP, 0);
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break;
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case PHY_MODE_USB_DEVICE:
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regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DM_PULLDOWN,
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0);
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regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DP_PULLDOWN,
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0);
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regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_ID_PULLUP,
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U2P_R0_ID_PULLUP);
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break;
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default:
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return -EINVAL;
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}
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phy_meson_gxl_usb2_reset(phy);
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priv->mode = mode;
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return 0;
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}
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static int phy_meson_gxl_usb2_power_off(struct phy *phy)
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{
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struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);
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priv->is_enabled = 0;
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/* power off the PHY by putting it into reset mode */
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regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET,
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U2P_R0_POWER_ON_RESET);
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return 0;
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}
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static int phy_meson_gxl_usb2_power_on(struct phy *phy)
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{
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struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy);
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int ret;
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priv->is_enabled = 1;
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/* power on the PHY by taking it out of reset mode */
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regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET, 0);
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ret = phy_meson_gxl_usb2_set_mode(phy, priv->mode, 0);
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if (ret) {
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phy_meson_gxl_usb2_power_off(phy);
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dev_err(&phy->dev, "Failed to initialize PHY with mode %d\n",
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priv->mode);
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return ret;
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}
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return 0;
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}
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static const struct phy_ops phy_meson_gxl_usb2_ops = {
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.init = phy_meson_gxl_usb2_init,
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.exit = phy_meson_gxl_usb2_exit,
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.power_on = phy_meson_gxl_usb2_power_on,
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.power_off = phy_meson_gxl_usb2_power_off,
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.set_mode = phy_meson_gxl_usb2_set_mode,
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.reset = phy_meson_gxl_usb2_reset,
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.owner = THIS_MODULE,
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};
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static int phy_meson_gxl_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 resource *res;
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struct phy_meson_gxl_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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platform_set_drvdata(pdev, priv);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(dev, res);
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if (IS_ERR(base))
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return PTR_ERR(base);
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/* start in host mode */
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priv->mode = PHY_MODE_USB_HOST;
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priv->regmap = devm_regmap_init_mmio(dev, base,
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&phy_meson_gxl_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, "phy");
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if (IS_ERR(priv->clk)) {
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ret = PTR_ERR(priv->clk);
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if (ret == -ENOENT)
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priv->clk = NULL;
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else
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return ret;
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}
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priv->reset = devm_reset_control_get_optional_shared(dev, "phy");
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if (IS_ERR(priv->reset))
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return PTR_ERR(priv->reset);
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phy = devm_phy_create(dev, NULL, &phy_meson_gxl_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_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_gxl_usb2_of_match[] = {
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{ .compatible = "amlogic,meson-gxl-usb2-phy", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, phy_meson_gxl_usb2_of_match);
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static struct platform_driver phy_meson_gxl_usb2_driver = {
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.probe = phy_meson_gxl_usb2_probe,
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.driver = {
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.name = "phy-meson-gxl-usb2",
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.of_match_table = phy_meson_gxl_usb2_of_match,
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},
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};
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module_platform_driver(phy_meson_gxl_usb2_driver);
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MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
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MODULE_DESCRIPTION("Meson GXL and GXM USB2 PHY driver");
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MODULE_LICENSE("GPL v2");
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