diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/phy/amlogic/phy-meson8b-usb2.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/drivers/phy/amlogic/phy-meson8b-usb2.c b/drivers/phy/amlogic/phy-meson8b-usb2.c new file mode 100644 index 000000000..dd9676391 --- /dev/null +++ b/drivers/phy/amlogic/phy-meson8b-usb2.c @@ -0,0 +1,337 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Meson8, Meson8b and GXBB USB2 PHY driver + * + * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com> + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/reset.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/usb/of.h> + +#define REG_CONFIG 0x00 + #define REG_CONFIG_CLK_EN BIT(0) + #define REG_CONFIG_CLK_SEL_MASK GENMASK(3, 1) + #define REG_CONFIG_CLK_DIV_MASK GENMASK(10, 4) + #define REG_CONFIG_CLK_32k_ALTSEL BIT(15) + #define REG_CONFIG_TEST_TRIG BIT(31) + +#define REG_CTRL 0x04 + #define REG_CTRL_SOFT_PRST BIT(0) + #define REG_CTRL_SOFT_HRESET BIT(1) + #define REG_CTRL_SS_SCALEDOWN_MODE_MASK GENMASK(3, 2) + #define REG_CTRL_CLK_DET_RST BIT(4) + #define REG_CTRL_INTR_SEL BIT(5) + #define REG_CTRL_CLK_DETECTED BIT(8) + #define REG_CTRL_SOF_SENT_RCVD_TGL BIT(9) + #define REG_CTRL_SOF_TOGGLE_OUT BIT(10) + #define REG_CTRL_POWER_ON_RESET BIT(15) + #define REG_CTRL_SLEEPM BIT(16) + #define REG_CTRL_TX_BITSTUFF_ENN_H BIT(17) + #define REG_CTRL_TX_BITSTUFF_ENN BIT(18) + #define REG_CTRL_COMMON_ON BIT(19) + #define REG_CTRL_REF_CLK_SEL_MASK GENMASK(21, 20) + #define REG_CTRL_REF_CLK_SEL_SHIFT 20 + #define REG_CTRL_FSEL_MASK GENMASK(24, 22) + #define REG_CTRL_FSEL_SHIFT 22 + #define REG_CTRL_PORT_RESET BIT(25) + #define REG_CTRL_THREAD_ID_MASK GENMASK(31, 26) + +#define REG_ENDP_INTR 0x08 + +/* bits [31:26], [24:21] and [15:3] seem to be read-only */ +#define REG_ADP_BC 0x0c + #define REG_ADP_BC_VBUS_VLD_EXT_SEL BIT(0) + #define REG_ADP_BC_VBUS_VLD_EXT BIT(1) + #define REG_ADP_BC_OTG_DISABLE BIT(2) + #define REG_ADP_BC_ID_PULLUP BIT(3) + #define REG_ADP_BC_DRV_VBUS BIT(4) + #define REG_ADP_BC_ADP_PRB_EN BIT(5) + #define REG_ADP_BC_ADP_DISCHARGE BIT(6) + #define REG_ADP_BC_ADP_CHARGE BIT(7) + #define REG_ADP_BC_SESS_END BIT(8) + #define REG_ADP_BC_DEVICE_SESS_VLD BIT(9) + #define REG_ADP_BC_B_VALID BIT(10) + #define REG_ADP_BC_A_VALID BIT(11) + #define REG_ADP_BC_ID_DIG BIT(12) + #define REG_ADP_BC_VBUS_VALID BIT(13) + #define REG_ADP_BC_ADP_PROBE BIT(14) + #define REG_ADP_BC_ADP_SENSE BIT(15) + #define REG_ADP_BC_ACA_ENABLE BIT(16) + #define REG_ADP_BC_DCD_ENABLE BIT(17) + #define REG_ADP_BC_VDAT_DET_EN_B BIT(18) + #define REG_ADP_BC_VDAT_SRC_EN_B BIT(19) + #define REG_ADP_BC_CHARGE_SEL BIT(20) + #define REG_ADP_BC_CHARGE_DETECT BIT(21) + #define REG_ADP_BC_ACA_PIN_RANGE_C BIT(22) + #define REG_ADP_BC_ACA_PIN_RANGE_B BIT(23) + #define REG_ADP_BC_ACA_PIN_RANGE_A BIT(24) + #define REG_ADP_BC_ACA_PIN_GND BIT(25) + #define REG_ADP_BC_ACA_PIN_FLOAT BIT(26) + +#define REG_DBG_UART 0x10 + #define REG_DBG_UART_BYPASS_SEL BIT(0) + #define REG_DBG_UART_BYPASS_DM_EN BIT(1) + #define REG_DBG_UART_BYPASS_DP_EN BIT(2) + #define REG_DBG_UART_BYPASS_DM_DATA BIT(3) + #define REG_DBG_UART_BYPASS_DP_DATA BIT(4) + #define REG_DBG_UART_FSV_MINUS BIT(5) + #define REG_DBG_UART_FSV_PLUS BIT(6) + #define REG_DBG_UART_FSV_BURN_IN_TEST BIT(7) + #define REG_DBG_UART_LOOPBACK_EN_B BIT(8) + #define REG_DBG_UART_SET_IDDQ BIT(9) + #define REG_DBG_UART_ATE_RESET BIT(10) + +#define REG_TEST 0x14 + #define REG_TEST_DATA_IN_MASK GENMASK(3, 0) + #define REG_TEST_EN_MASK GENMASK(7, 4) + #define REG_TEST_ADDR_MASK GENMASK(11, 8) + #define REG_TEST_DATA_OUT_SEL BIT(12) + #define REG_TEST_CLK BIT(13) + #define REG_TEST_VA_TEST_EN_B_MASK GENMASK(15, 14) + #define REG_TEST_DATA_OUT_MASK GENMASK(19, 16) + #define REG_TEST_DISABLE_ID_PULLUP BIT(20) + +#define REG_TUNE 0x18 + #define REG_TUNE_TX_RES_TUNE_MASK GENMASK(1, 0) + #define REG_TUNE_TX_HSXV_TUNE_MASK GENMASK(3, 2) + #define REG_TUNE_TX_VREF_TUNE_MASK GENMASK(7, 4) + #define REG_TUNE_TX_RISE_TUNE_MASK GENMASK(9, 8) + #define REG_TUNE_TX_PREEMP_PULSE_TUNE BIT(10) + #define REG_TUNE_TX_PREEMP_AMP_TUNE_MASK GENMASK(12, 11) + #define REG_TUNE_TX_FSLS_TUNE_MASK GENMASK(16, 13) + #define REG_TUNE_SQRX_TUNE_MASK GENMASK(19, 17) + #define REG_TUNE_OTG_TUNE GENMASK(22, 20) + #define REG_TUNE_COMP_DIS_TUNE GENMASK(25, 23) + #define REG_TUNE_HOST_DM_PULLDOWN BIT(26) + #define REG_TUNE_HOST_DP_PULLDOWN BIT(27) + +#define RESET_COMPLETE_TIME 500 +#define ACA_ENABLE_COMPLETE_TIME 50 + +struct phy_meson8b_usb2_match_data { + bool host_enable_aca; +}; + +struct phy_meson8b_usb2_priv { + struct regmap *regmap; + enum usb_dr_mode dr_mode; + struct clk *clk_usb_general; + struct clk *clk_usb; + struct reset_control *reset; + const struct phy_meson8b_usb2_match_data *match; +}; + +static const struct regmap_config phy_meson8b_usb2_regmap_conf = { + .reg_bits = 8, + .val_bits = 32, + .reg_stride = 4, + .max_register = REG_TUNE, +}; + +static int phy_meson8b_usb2_power_on(struct phy *phy) +{ + struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy); + u32 reg; + int ret; + + if (!IS_ERR_OR_NULL(priv->reset)) { + ret = reset_control_reset(priv->reset); + if (ret) { + dev_err(&phy->dev, "Failed to trigger USB reset\n"); + return ret; + } + } + + ret = clk_prepare_enable(priv->clk_usb_general); + if (ret) { + dev_err(&phy->dev, "Failed to enable USB general clock\n"); + reset_control_rearm(priv->reset); + return ret; + } + + ret = clk_prepare_enable(priv->clk_usb); + if (ret) { + dev_err(&phy->dev, "Failed to enable USB DDR clock\n"); + clk_disable_unprepare(priv->clk_usb_general); + reset_control_rearm(priv->reset); + return ret; + } + + regmap_update_bits(priv->regmap, REG_CONFIG, REG_CONFIG_CLK_32k_ALTSEL, + REG_CONFIG_CLK_32k_ALTSEL); + + regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_REF_CLK_SEL_MASK, + 0x2 << REG_CTRL_REF_CLK_SEL_SHIFT); + + regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_FSEL_MASK, + 0x5 << REG_CTRL_FSEL_SHIFT); + + /* reset the PHY */ + regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET, + REG_CTRL_POWER_ON_RESET); + udelay(RESET_COMPLETE_TIME); + regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET, 0); + udelay(RESET_COMPLETE_TIME); + + regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_SOF_TOGGLE_OUT, + REG_CTRL_SOF_TOGGLE_OUT); + + if (priv->dr_mode == USB_DR_MODE_HOST) { + regmap_update_bits(priv->regmap, REG_DBG_UART, + REG_DBG_UART_SET_IDDQ, 0); + + if (priv->match->host_enable_aca) { + regmap_update_bits(priv->regmap, REG_ADP_BC, + REG_ADP_BC_ACA_ENABLE, + REG_ADP_BC_ACA_ENABLE); + + udelay(ACA_ENABLE_COMPLETE_TIME); + + regmap_read(priv->regmap, REG_ADP_BC, ®); + if (reg & REG_ADP_BC_ACA_PIN_FLOAT) { + dev_warn(&phy->dev, "USB ID detect failed!\n"); + clk_disable_unprepare(priv->clk_usb); + clk_disable_unprepare(priv->clk_usb_general); + reset_control_rearm(priv->reset); + return -EINVAL; + } + } + } + + return 0; +} + +static int phy_meson8b_usb2_power_off(struct phy *phy) +{ + struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy); + + if (priv->dr_mode == USB_DR_MODE_HOST) + regmap_update_bits(priv->regmap, REG_DBG_UART, + REG_DBG_UART_SET_IDDQ, + REG_DBG_UART_SET_IDDQ); + + clk_disable_unprepare(priv->clk_usb); + clk_disable_unprepare(priv->clk_usb_general); + reset_control_rearm(priv->reset); + + /* power off the PHY by putting it into reset mode */ + regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET, + REG_CTRL_POWER_ON_RESET); + + return 0; +} + +static const struct phy_ops phy_meson8b_usb2_ops = { + .power_on = phy_meson8b_usb2_power_on, + .power_off = phy_meson8b_usb2_power_off, + .owner = THIS_MODULE, +}; + +static int phy_meson8b_usb2_probe(struct platform_device *pdev) +{ + struct phy_meson8b_usb2_priv *priv; + struct phy *phy; + struct phy_provider *phy_provider; + void __iomem *base; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + priv->match = device_get_match_data(&pdev->dev); + if (!priv->match) + return -ENODEV; + + priv->regmap = devm_regmap_init_mmio(&pdev->dev, base, + &phy_meson8b_usb2_regmap_conf); + if (IS_ERR(priv->regmap)) + return PTR_ERR(priv->regmap); + + priv->clk_usb_general = devm_clk_get(&pdev->dev, "usb_general"); + if (IS_ERR(priv->clk_usb_general)) + return PTR_ERR(priv->clk_usb_general); + + priv->clk_usb = devm_clk_get(&pdev->dev, "usb"); + if (IS_ERR(priv->clk_usb)) + return PTR_ERR(priv->clk_usb); + + priv->reset = devm_reset_control_get_optional_shared(&pdev->dev, NULL); + if (IS_ERR(priv->reset)) + return dev_err_probe(&pdev->dev, PTR_ERR(priv->reset), + "Failed to get the reset line"); + + priv->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1); + if (priv->dr_mode == USB_DR_MODE_UNKNOWN) { + dev_err(&pdev->dev, + "missing dual role configuration of the controller\n"); + return -EINVAL; + } + + phy = devm_phy_create(&pdev->dev, NULL, &phy_meson8b_usb2_ops); + if (IS_ERR(phy)) { + return dev_err_probe(&pdev->dev, PTR_ERR(phy), + "failed to create PHY\n"); + } + + phy_set_drvdata(phy, priv); + + phy_provider = + devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate); + + return PTR_ERR_OR_ZERO(phy_provider); +} + +static const struct phy_meson8b_usb2_match_data phy_meson8_usb2_match_data = { + .host_enable_aca = false, +}; + +static const struct phy_meson8b_usb2_match_data phy_meson8b_usb2_match_data = { + .host_enable_aca = true, +}; + +static const struct of_device_id phy_meson8b_usb2_of_match[] = { + { + .compatible = "amlogic,meson8-usb2-phy", + .data = &phy_meson8_usb2_match_data + }, + { + .compatible = "amlogic,meson8b-usb2-phy", + .data = &phy_meson8b_usb2_match_data + }, + { + .compatible = "amlogic,meson8m2-usb2-phy", + .data = &phy_meson8b_usb2_match_data + }, + { + .compatible = "amlogic,meson-gxbb-usb2-phy", + .data = &phy_meson8b_usb2_match_data + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, phy_meson8b_usb2_of_match); + +static struct platform_driver phy_meson8b_usb2_driver = { + .probe = phy_meson8b_usb2_probe, + .driver = { + .name = "phy-meson-usb2", + .of_match_table = phy_meson8b_usb2_of_match, + }, +}; +module_platform_driver(phy_meson8b_usb2_driver); + +MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>"); +MODULE_DESCRIPTION("Meson8, Meson8b, Meson8m2 and GXBB USB2 PHY driver"); +MODULE_LICENSE("GPL"); |