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linux/drivers/phy/amlogic/phy-meson-g12a-usb3-pcie.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Amlogic G12A USB3 + PCIE Combo PHY driver
*
* Copyright (C) 2017 Amlogic, Inc. All rights reserved
* Copyright (C) 2019 BayLibre, SAS
* Author: Neil Armstrong <narmstrong@baylibre.com>
*/
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/phy/phy.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/platform_device.h>
#include <dt-bindings/phy/phy.h>
#define PHY_R0 0x00
#define PHY_R0_PCIE_POWER_STATE GENMASK(4, 0)
#define PHY_R0_PCIE_USB3_SWITCH GENMASK(6, 5)
#define PHY_R1 0x04
#define PHY_R1_PHY_TX1_TERM_OFFSET GENMASK(4, 0)
#define PHY_R1_PHY_TX0_TERM_OFFSET GENMASK(9, 5)
#define PHY_R1_PHY_RX1_EQ GENMASK(12, 10)
#define PHY_R1_PHY_RX0_EQ GENMASK(15, 13)
#define PHY_R1_PHY_LOS_LEVEL GENMASK(20, 16)
#define PHY_R1_PHY_LOS_BIAS GENMASK(23, 21)
#define PHY_R1_PHY_REF_CLKDIV2 BIT(24)
#define PHY_R1_PHY_MPLL_MULTIPLIER GENMASK(31, 25)
#define PHY_R2 0x08
#define PHY_R2_PCS_TX_DEEMPH_GEN2_6DB GENMASK(5, 0)
#define PHY_R2_PCS_TX_DEEMPH_GEN2_3P5DB GENMASK(11, 6)
#define PHY_R2_PCS_TX_DEEMPH_GEN1 GENMASK(17, 12)
#define PHY_R2_PHY_TX_VBOOST_LVL GENMASK(20, 18)
#define PHY_R4 0x10
#define PHY_R4_PHY_CR_WRITE BIT(0)
#define PHY_R4_PHY_CR_READ BIT(1)
#define PHY_R4_PHY_CR_DATA_IN GENMASK(17, 2)
#define PHY_R4_PHY_CR_CAP_DATA BIT(18)
#define PHY_R4_PHY_CR_CAP_ADDR BIT(19)
#define PHY_R5 0x14
#define PHY_R5_PHY_CR_DATA_OUT GENMASK(15, 0)
#define PHY_R5_PHY_CR_ACK BIT(16)
#define PHY_R5_PHY_BS_OUT BIT(17)
struct phy_g12a_usb3_pcie_priv {
struct regmap *regmap;
struct regmap *regmap_cr;
struct clk *clk_ref;
struct reset_control *reset;
struct phy *phy;
unsigned int mode;
};
static const struct regmap_config phy_g12a_usb3_pcie_regmap_conf = {
.reg_bits = 8,
.val_bits = 32,
.reg_stride = 4,
.max_register = PHY_R5,
};
static int phy_g12a_usb3_pcie_cr_bus_addr(struct phy_g12a_usb3_pcie_priv *priv,
unsigned int addr)
{
unsigned int val, reg;
int ret;
reg = FIELD_PREP(PHY_R4_PHY_CR_DATA_IN, addr);
regmap_write(priv->regmap, PHY_R4, reg);
regmap_write(priv->regmap, PHY_R4, reg);
regmap_write(priv->regmap, PHY_R4, reg | PHY_R4_PHY_CR_CAP_ADDR);
ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
(val & PHY_R5_PHY_CR_ACK),
5, 1000);
if (ret)
return ret;
regmap_write(priv->regmap, PHY_R4, reg);
ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
!(val & PHY_R5_PHY_CR_ACK),
5, 1000);
if (ret)
return ret;
return 0;
}
static int phy_g12a_usb3_pcie_cr_bus_read(void *context, unsigned int addr,
unsigned int *data)
{
struct phy_g12a_usb3_pcie_priv *priv = context;
unsigned int val;
int ret;
ret = phy_g12a_usb3_pcie_cr_bus_addr(priv, addr);
if (ret)
return ret;
regmap_write(priv->regmap, PHY_R4, 0);
regmap_write(priv->regmap, PHY_R4, PHY_R4_PHY_CR_READ);
ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
(val & PHY_R5_PHY_CR_ACK),
5, 1000);
if (ret)
return ret;
*data = FIELD_GET(PHY_R5_PHY_CR_DATA_OUT, val);
regmap_write(priv->regmap, PHY_R4, 0);
ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
!(val & PHY_R5_PHY_CR_ACK),
5, 1000);
if (ret)
return ret;
return 0;
}
static int phy_g12a_usb3_pcie_cr_bus_write(void *context, unsigned int addr,
unsigned int data)
{
struct phy_g12a_usb3_pcie_priv *priv = context;
unsigned int val, reg;
int ret;
ret = phy_g12a_usb3_pcie_cr_bus_addr(priv, addr);
if (ret)
return ret;
reg = FIELD_PREP(PHY_R4_PHY_CR_DATA_IN, data);
regmap_write(priv->regmap, PHY_R4, reg);
regmap_write(priv->regmap, PHY_R4, reg);
regmap_write(priv->regmap, PHY_R4, reg | PHY_R4_PHY_CR_CAP_DATA);
ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
(val & PHY_R5_PHY_CR_ACK),
5, 1000);
if (ret)
return ret;
regmap_write(priv->regmap, PHY_R4, reg);
ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
(val & PHY_R5_PHY_CR_ACK) == 0,
5, 1000);
if (ret)
return ret;
regmap_write(priv->regmap, PHY_R4, reg);
regmap_write(priv->regmap, PHY_R4, reg | PHY_R4_PHY_CR_WRITE);
ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
(val & PHY_R5_PHY_CR_ACK),
5, 1000);
if (ret)
return ret;
regmap_write(priv->regmap, PHY_R4, reg);
ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
(val & PHY_R5_PHY_CR_ACK) == 0,
5, 1000);
if (ret)
return ret;
return 0;
}
static const struct regmap_config phy_g12a_usb3_pcie_cr_regmap_conf = {
.reg_bits = 16,
.val_bits = 16,
.reg_read = phy_g12a_usb3_pcie_cr_bus_read,
.reg_write = phy_g12a_usb3_pcie_cr_bus_write,
.max_register = 0xffff,
.fast_io = true,
};
static int phy_g12a_usb3_init(struct phy *phy)
{
struct phy_g12a_usb3_pcie_priv *priv = phy_get_drvdata(phy);
int data, ret;
/* Switch PHY to USB3 */
/* TODO figure out how to handle when PCIe was set in the bootloader */
regmap_update_bits(priv->regmap, PHY_R0,
PHY_R0_PCIE_USB3_SWITCH,
PHY_R0_PCIE_USB3_SWITCH);
/*
* WORKAROUND: There is SSPHY suspend bug due to
* which USB enumerates
* in HS mode instead of SS mode. Workaround it by asserting
* LANE0.TX_ALT_BLOCK.EN_ALT_BUS to enable TX to use alt bus
* mode
*/
ret = regmap_update_bits(priv->regmap_cr, 0x102d, BIT(7), BIT(7));
if (ret)
return ret;
ret = regmap_update_bits(priv->regmap_cr, 0x1010, 0xff0, 20);
if (ret)
return ret;
/*
* Fix RX Equalization setting as follows
* LANE0.RX_OVRD_IN_HI. RX_EQ_EN set to 0
* LANE0.RX_OVRD_IN_HI.RX_EQ_EN_OVRD set to 1
* LANE0.RX_OVRD_IN_HI.RX_EQ set to 3
* LANE0.RX_OVRD_IN_HI.RX_EQ_OVRD set to 1
*/
ret = regmap_read(priv->regmap_cr, 0x1006, &data);
if (ret)
return ret;
data &= ~BIT(6);
data |= BIT(7);
data &= ~(0x7 << 8);
data |= (0x3 << 8);
data |= (1 << 11);
ret = regmap_write(priv->regmap_cr, 0x1006, data);
if (ret)
return ret;
/*
* Set EQ and TX launch amplitudes as follows
* LANE0.TX_OVRD_DRV_LO.PREEMPH set to 22
* LANE0.TX_OVRD_DRV_LO.AMPLITUDE set to 127
* LANE0.TX_OVRD_DRV_LO.EN set to 1.
*/
ret = regmap_read(priv->regmap_cr, 0x1002, &data);
if (ret)
return ret;
data &= ~0x3f80;
data |= (0x16 << 7);
data &= ~0x7f;
data |= (0x7f | BIT(14));
ret = regmap_write(priv->regmap_cr, 0x1002, data);
if (ret)
return ret;
/* MPLL_LOOP_CTL.PROP_CNTRL = 8 */
ret = regmap_update_bits(priv->regmap_cr, 0x30, 0xf << 4, 8 << 4);
if (ret)
return ret;
regmap_update_bits(priv->regmap, PHY_R2,
PHY_R2_PHY_TX_VBOOST_LVL,
FIELD_PREP(PHY_R2_PHY_TX_VBOOST_LVL, 0x4));
regmap_update_bits(priv->regmap, PHY_R1,
PHY_R1_PHY_LOS_BIAS | PHY_R1_PHY_LOS_LEVEL,
FIELD_PREP(PHY_R1_PHY_LOS_BIAS, 4) |
FIELD_PREP(PHY_R1_PHY_LOS_LEVEL, 9));
return 0;
}
static int phy_g12a_usb3_pcie_init(struct phy *phy)
{
struct phy_g12a_usb3_pcie_priv *priv = phy_get_drvdata(phy);
int ret;
ret = reset_control_reset(priv->reset);
if (ret)
return ret;
if (priv->mode == PHY_TYPE_USB3)
return phy_g12a_usb3_init(phy);
/* Power UP PCIE */
/* TODO figure out when the bootloader has set USB3 mode before */
regmap_update_bits(priv->regmap, PHY_R0,
PHY_R0_PCIE_POWER_STATE,
FIELD_PREP(PHY_R0_PCIE_POWER_STATE, 0x1c));
return 0;
}
static int phy_g12a_usb3_pcie_exit(struct phy *phy)
{
struct phy_g12a_usb3_pcie_priv *priv = phy_get_drvdata(phy);
return reset_control_reset(priv->reset);
}
static struct phy *phy_g12a_usb3_pcie_xlate(struct device *dev,
struct of_phandle_args *args)
{
struct phy_g12a_usb3_pcie_priv *priv = dev_get_drvdata(dev);
unsigned int mode;
if (args->args_count < 1) {
dev_err(dev, "invalid number of arguments\n");
return ERR_PTR(-EINVAL);
}
mode = args->args[0];
if (mode != PHY_TYPE_USB3 && mode != PHY_TYPE_PCIE) {
dev_err(dev, "invalid phy mode select argument\n");
return ERR_PTR(-EINVAL);
}
priv->mode = mode;
return priv->phy;
}
static const struct phy_ops phy_g12a_usb3_pcie_ops = {
.init = phy_g12a_usb3_pcie_init,
.exit = phy_g12a_usb3_pcie_exit,
.owner = THIS_MODULE,
};
static int phy_g12a_usb3_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct phy_g12a_usb3_pcie_priv *priv;
struct resource *res;
struct phy_provider *phy_provider;
void __iomem *base;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
priv->regmap = devm_regmap_init_mmio(dev, base,
&phy_g12a_usb3_pcie_regmap_conf);
if (IS_ERR(priv->regmap))
return PTR_ERR(priv->regmap);
priv->regmap_cr = devm_regmap_init(dev, NULL, priv,
&phy_g12a_usb3_pcie_cr_regmap_conf);
if (IS_ERR(priv->regmap_cr))
return PTR_ERR(priv->regmap_cr);
priv->clk_ref = devm_clk_get(dev, "ref_clk");
if (IS_ERR(priv->clk_ref))
return PTR_ERR(priv->clk_ref);
ret = clk_prepare_enable(priv->clk_ref);
if (ret)
goto err_disable_clk_ref;
priv->reset = devm_reset_control_array_get(dev, false, false);
if (IS_ERR(priv->reset))
return PTR_ERR(priv->reset);
priv->phy = devm_phy_create(dev, np, &phy_g12a_usb3_pcie_ops);
if (IS_ERR(priv->phy)) {
ret = PTR_ERR(priv->phy);
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to create PHY\n");
return ret;
}
phy_set_drvdata(priv->phy, priv);
dev_set_drvdata(dev, priv);
phy_provider = devm_of_phy_provider_register(dev,
phy_g12a_usb3_pcie_xlate);
return PTR_ERR_OR_ZERO(phy_provider);
err_disable_clk_ref:
clk_disable_unprepare(priv->clk_ref);
return ret;
}
static const struct of_device_id phy_g12a_usb3_pcie_of_match[] = {
{ .compatible = "amlogic,g12a-usb3-pcie-phy", },
{ },
};
MODULE_DEVICE_TABLE(of, phy_g12a_usb3_pcie_of_match);
static struct platform_driver phy_g12a_usb3_pcie_driver = {
.probe = phy_g12a_usb3_pcie_probe,
.driver = {
.name = "phy-g12a-usb3-pcie",
.of_match_table = phy_g12a_usb3_pcie_of_match,
},
};
module_platform_driver(phy_g12a_usb3_pcie_driver);
MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
MODULE_DESCRIPTION("Amlogic G12A USB3 + PCIE Combo PHY driver");
MODULE_LICENSE("GPL v2");
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