287 lines
8.6 KiB
C
287 lines
8.6 KiB
C
/*
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* Meson8b and GXBB USB2 PHY driver
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*
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* Copyright (C) 2016 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/reset.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/usb/of.h>
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#define REG_CONFIG 0x00
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#define REG_CONFIG_CLK_EN BIT(0)
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#define REG_CONFIG_CLK_SEL_MASK GENMASK(3, 1)
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#define REG_CONFIG_CLK_DIV_MASK GENMASK(10, 4)
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#define REG_CONFIG_CLK_32k_ALTSEL BIT(15)
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#define REG_CONFIG_TEST_TRIG BIT(31)
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#define REG_CTRL 0x04
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#define REG_CTRL_SOFT_PRST BIT(0)
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#define REG_CTRL_SOFT_HRESET BIT(1)
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#define REG_CTRL_SS_SCALEDOWN_MODE_MASK GENMASK(3, 2)
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#define REG_CTRL_CLK_DET_RST BIT(4)
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#define REG_CTRL_INTR_SEL BIT(5)
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#define REG_CTRL_CLK_DETECTED BIT(8)
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#define REG_CTRL_SOF_SENT_RCVD_TGL BIT(9)
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#define REG_CTRL_SOF_TOGGLE_OUT BIT(10)
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#define REG_CTRL_POWER_ON_RESET BIT(15)
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#define REG_CTRL_SLEEPM BIT(16)
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#define REG_CTRL_TX_BITSTUFF_ENN_H BIT(17)
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#define REG_CTRL_TX_BITSTUFF_ENN BIT(18)
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#define REG_CTRL_COMMON_ON BIT(19)
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#define REG_CTRL_REF_CLK_SEL_MASK GENMASK(21, 20)
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#define REG_CTRL_REF_CLK_SEL_SHIFT 20
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#define REG_CTRL_FSEL_MASK GENMASK(24, 22)
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#define REG_CTRL_FSEL_SHIFT 22
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#define REG_CTRL_PORT_RESET BIT(25)
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#define REG_CTRL_THREAD_ID_MASK GENMASK(31, 26)
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#define REG_ENDP_INTR 0x08
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/* bits [31:26], [24:21] and [15:3] seem to be read-only */
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#define REG_ADP_BC 0x0c
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#define REG_ADP_BC_VBUS_VLD_EXT_SEL BIT(0)
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#define REG_ADP_BC_VBUS_VLD_EXT BIT(1)
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#define REG_ADP_BC_OTG_DISABLE BIT(2)
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#define REG_ADP_BC_ID_PULLUP BIT(3)
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#define REG_ADP_BC_DRV_VBUS BIT(4)
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#define REG_ADP_BC_ADP_PRB_EN BIT(5)
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#define REG_ADP_BC_ADP_DISCHARGE BIT(6)
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#define REG_ADP_BC_ADP_CHARGE BIT(7)
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#define REG_ADP_BC_SESS_END BIT(8)
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#define REG_ADP_BC_DEVICE_SESS_VLD BIT(9)
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#define REG_ADP_BC_B_VALID BIT(10)
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#define REG_ADP_BC_A_VALID BIT(11)
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#define REG_ADP_BC_ID_DIG BIT(12)
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#define REG_ADP_BC_VBUS_VALID BIT(13)
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#define REG_ADP_BC_ADP_PROBE BIT(14)
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#define REG_ADP_BC_ADP_SENSE BIT(15)
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#define REG_ADP_BC_ACA_ENABLE BIT(16)
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#define REG_ADP_BC_DCD_ENABLE BIT(17)
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#define REG_ADP_BC_VDAT_DET_EN_B BIT(18)
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#define REG_ADP_BC_VDAT_SRC_EN_B BIT(19)
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#define REG_ADP_BC_CHARGE_SEL BIT(20)
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#define REG_ADP_BC_CHARGE_DETECT BIT(21)
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#define REG_ADP_BC_ACA_PIN_RANGE_C BIT(22)
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#define REG_ADP_BC_ACA_PIN_RANGE_B BIT(23)
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#define REG_ADP_BC_ACA_PIN_RANGE_A BIT(24)
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#define REG_ADP_BC_ACA_PIN_GND BIT(25)
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#define REG_ADP_BC_ACA_PIN_FLOAT BIT(26)
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#define REG_DBG_UART 0x10
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#define REG_TEST 0x14
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#define REG_TEST_DATA_IN_MASK GENMASK(3, 0)
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#define REG_TEST_EN_MASK GENMASK(7, 4)
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#define REG_TEST_ADDR_MASK GENMASK(11, 8)
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#define REG_TEST_DATA_OUT_SEL BIT(12)
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#define REG_TEST_CLK BIT(13)
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#define REG_TEST_VA_TEST_EN_B_MASK GENMASK(15, 14)
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#define REG_TEST_DATA_OUT_MASK GENMASK(19, 16)
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#define REG_TEST_DISABLE_ID_PULLUP BIT(20)
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#define REG_TUNE 0x18
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#define REG_TUNE_TX_RES_TUNE_MASK GENMASK(1, 0)
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#define REG_TUNE_TX_HSXV_TUNE_MASK GENMASK(3, 2)
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#define REG_TUNE_TX_VREF_TUNE_MASK GENMASK(7, 4)
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#define REG_TUNE_TX_RISE_TUNE_MASK GENMASK(9, 8)
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#define REG_TUNE_TX_PREEMP_PULSE_TUNE BIT(10)
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#define REG_TUNE_TX_PREEMP_AMP_TUNE_MASK GENMASK(12, 11)
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#define REG_TUNE_TX_FSLS_TUNE_MASK GENMASK(16, 13)
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#define REG_TUNE_SQRX_TUNE_MASK GENMASK(19, 17)
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#define REG_TUNE_OTG_TUNE GENMASK(22, 20)
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#define REG_TUNE_COMP_DIS_TUNE GENMASK(25, 23)
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#define REG_TUNE_HOST_DM_PULLDOWN BIT(26)
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#define REG_TUNE_HOST_DP_PULLDOWN BIT(27)
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#define RESET_COMPLETE_TIME 500
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#define ACA_ENABLE_COMPLETE_TIME 50
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struct phy_meson8b_usb2_priv {
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void __iomem *regs;
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enum usb_dr_mode dr_mode;
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struct clk *clk_usb_general;
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struct clk *clk_usb;
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struct reset_control *reset;
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};
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static u32 phy_meson8b_usb2_read(struct phy_meson8b_usb2_priv *phy_priv,
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u32 reg)
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{
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return readl(phy_priv->regs + reg);
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}
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static void phy_meson8b_usb2_mask_bits(struct phy_meson8b_usb2_priv *phy_priv,
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u32 reg, u32 mask, u32 value)
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{
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u32 data;
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data = phy_meson8b_usb2_read(phy_priv, reg);
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data &= ~mask;
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data |= (value & mask);
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writel(data, phy_priv->regs + reg);
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}
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static int phy_meson8b_usb2_power_on(struct phy *phy)
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{
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struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);
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int ret;
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if (!IS_ERR_OR_NULL(priv->reset)) {
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ret = reset_control_reset(priv->reset);
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if (ret) {
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dev_err(&phy->dev, "Failed to trigger USB reset\n");
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return ret;
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}
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}
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ret = clk_prepare_enable(priv->clk_usb_general);
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if (ret) {
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dev_err(&phy->dev, "Failed to enable USB general clock\n");
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return ret;
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}
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ret = clk_prepare_enable(priv->clk_usb);
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if (ret) {
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dev_err(&phy->dev, "Failed to enable USB DDR clock\n");
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clk_disable_unprepare(priv->clk_usb_general);
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return ret;
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}
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phy_meson8b_usb2_mask_bits(priv, REG_CONFIG, REG_CONFIG_CLK_32k_ALTSEL,
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REG_CONFIG_CLK_32k_ALTSEL);
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phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_REF_CLK_SEL_MASK,
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0x2 << REG_CTRL_REF_CLK_SEL_SHIFT);
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phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_FSEL_MASK,
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0x5 << REG_CTRL_FSEL_SHIFT);
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/* reset the PHY */
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phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_POWER_ON_RESET,
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REG_CTRL_POWER_ON_RESET);
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udelay(RESET_COMPLETE_TIME);
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phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_POWER_ON_RESET, 0);
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udelay(RESET_COMPLETE_TIME);
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phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_SOF_TOGGLE_OUT,
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REG_CTRL_SOF_TOGGLE_OUT);
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if (priv->dr_mode == USB_DR_MODE_HOST) {
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phy_meson8b_usb2_mask_bits(priv, REG_ADP_BC,
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REG_ADP_BC_ACA_ENABLE,
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REG_ADP_BC_ACA_ENABLE);
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udelay(ACA_ENABLE_COMPLETE_TIME);
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if (phy_meson8b_usb2_read(priv, REG_ADP_BC) &
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REG_ADP_BC_ACA_PIN_FLOAT) {
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dev_warn(&phy->dev, "USB ID detect failed!\n");
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clk_disable_unprepare(priv->clk_usb);
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clk_disable_unprepare(priv->clk_usb_general);
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return -EINVAL;
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}
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}
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return 0;
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}
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static int phy_meson8b_usb2_power_off(struct phy *phy)
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{
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struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);
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clk_disable_unprepare(priv->clk_usb);
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clk_disable_unprepare(priv->clk_usb_general);
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return 0;
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}
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static const struct phy_ops phy_meson8b_usb2_ops = {
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.power_on = phy_meson8b_usb2_power_on,
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.power_off = phy_meson8b_usb2_power_off,
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.owner = THIS_MODULE,
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};
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static int phy_meson8b_usb2_probe(struct platform_device *pdev)
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{
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struct phy_meson8b_usb2_priv *priv;
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struct resource *res;
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struct phy *phy;
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struct phy_provider *phy_provider;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(priv->regs))
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return PTR_ERR(priv->regs);
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priv->clk_usb_general = devm_clk_get(&pdev->dev, "usb_general");
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if (IS_ERR(priv->clk_usb_general))
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return PTR_ERR(priv->clk_usb_general);
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priv->clk_usb = devm_clk_get(&pdev->dev, "usb");
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if (IS_ERR(priv->clk_usb))
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return PTR_ERR(priv->clk_usb);
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priv->reset = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
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if (PTR_ERR(priv->reset) == -EPROBE_DEFER)
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return PTR_ERR(priv->reset);
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priv->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1);
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if (priv->dr_mode == USB_DR_MODE_UNKNOWN) {
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dev_err(&pdev->dev,
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"missing dual role configuration of the controller\n");
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return -EINVAL;
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}
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phy = devm_phy_create(&pdev->dev, NULL, &phy_meson8b_usb2_ops);
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if (IS_ERR(phy)) {
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dev_err(&pdev->dev, "failed to create PHY\n");
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return PTR_ERR(phy);
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}
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phy_set_drvdata(phy, priv);
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phy_provider =
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devm_of_phy_provider_register(&pdev->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_meson8b_usb2_of_match[] = {
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{ .compatible = "amlogic,meson8b-usb2-phy", },
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{ .compatible = "amlogic,meson-gxbb-usb2-phy", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, phy_meson8b_usb2_of_match);
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static struct platform_driver phy_meson8b_usb2_driver = {
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.probe = phy_meson8b_usb2_probe,
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.driver = {
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.name = "phy-meson-usb2",
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.of_match_table = phy_meson8b_usb2_of_match,
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},
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};
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module_platform_driver(phy_meson8b_usb2_driver);
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MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
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MODULE_DESCRIPTION("Meson8b and GXBB USB2 PHY driver");
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MODULE_LICENSE("GPL");
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