/*
* Meson8, Meson8b and GXBB USB2 PHY driver
*
* Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_device.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_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_priv {
void __iomem *regs;
enum usb_dr_mode dr_mode;
struct clk *clk_usb_general;
struct clk *clk_usb;
struct reset_control *reset;
};
static u32 phy_meson8b_usb2_read(struct phy_meson8b_usb2_priv *phy_priv,
u32 reg)
{
return readl(phy_priv->regs + reg);
}
static void phy_meson8b_usb2_mask_bits(struct phy_meson8b_usb2_priv *phy_priv,
u32 reg, u32 mask, u32 value)
{
u32 data;
data = phy_meson8b_usb2_read(phy_priv, reg);
data &= ~mask;
data |= (value & mask);
writel(data, phy_priv->regs + reg);
}
static int phy_meson8b_usb2_power_on(struct phy *phy)
{
struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);
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");
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);
return ret;
}
phy_meson8b_usb2_mask_bits(priv, REG_CONFIG, REG_CONFIG_CLK_32k_ALTSEL,
REG_CONFIG_CLK_32k_ALTSEL);
phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_REF_CLK_SEL_MASK,
0x2 << REG_CTRL_REF_CLK_SEL_SHIFT);
phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_FSEL_MASK,
0x5 << REG_CTRL_FSEL_SHIFT);
/* reset the PHY */
phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_POWER_ON_RESET,
REG_CTRL_POWER_ON_RESET);
udelay(RESET_COMPLETE_TIME);
phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_POWER_ON_RESET, 0);
udelay(RESET_COMPLETE_TIME);
phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_SOF_TOGGLE_OUT,
REG_CTRL_SOF_TOGGLE_OUT);
if (priv->dr_mode == USB_DR_MODE_HOST) {
phy_meson8b_usb2_mask_bits(priv, REG_ADP_BC,
REG_ADP_BC_ACA_ENABLE,
REG_ADP_BC_ACA_ENABLE);
udelay(ACA_ENABLE_COMPLETE_TIME);
if (phy_meson8b_usb2_read(priv, REG_ADP_BC) &
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);
return -EINVAL;
}
}
return 0;
}
static int phy_meson8b_usb2_power_off(struct phy *phy)
{
struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);
clk_disable_unprepare(priv->clk_usb);
clk_disable_unprepare(priv->clk_usb_general);
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 resource *res;
struct phy *phy;
struct phy_provider *phy_provider;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(priv->regs))
return PTR_ERR(priv->regs);
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 (PTR_ERR(priv->reset) == -EPROBE_DEFER)
return PTR_ERR(priv->reset);
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)) {
dev_err(&pdev->dev, "failed to create PHY\n");
return PTR_ERR(phy);
}
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 of_device_id phy_meson8b_usb2_of_match[] = {
{ .compatible = "amlogic,meson8-usb2-phy", },
{ .compatible = "amlogic,meson8b-usb2-phy", },
{ .compatible = "amlogic,meson-gxbb-usb2-phy", },
{ },
};
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 and GXBB USB2 PHY driver");
MODULE_LICENSE("GPL");