// SPDX-License-Identifier: GPL-2.0
/*
* Phy provider for USB 3.0 controller on HiSilicon 3660 platform
*
* Copyright (C) 2017-2018 Hilisicon Electronics Co., Ltd.
* http://www.huawei.com
*
* Authors: Yu Chen <chenyu56@huawei.com>
*/
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define PERI_CRG_CLK_EN4 0x40
#define PERI_CRG_CLK_DIS4 0x44
#define GT_CLK_USB3OTG_REF BIT(0)
#define GT_ACLK_USB3OTG BIT(1)
#define PERI_CRG_RSTEN4 0x90
#define PERI_CRG_RSTDIS4 0x94
#define IP_RST_USB3OTGPHY_POR BIT(3)
#define IP_RST_USB3OTG BIT(5)
#define PERI_CRG_ISODIS 0x148
#define USB_REFCLK_ISO_EN BIT(25)
#define PCTRL_PERI_CTRL3 0x10
#define PCTRL_PERI_CTRL3_MSK_START 16
#define USB_TCXO_EN BIT(1)
#define PCTRL_PERI_CTRL24 0x64
#define SC_CLK_USB3PHY_3MUX1_SEL BIT(25)
#define USBOTG3_CTRL0 0x00
#define SC_USB3PHY_ABB_GT_EN BIT(15)
#define USBOTG3_CTRL2 0x08
#define USBOTG3CTRL2_POWERDOWN_HSP BIT(0)
#define USBOTG3CTRL2_POWERDOWN_SSP BIT(1)
#define USBOTG3_CTRL3 0x0C
#define USBOTG3_CTRL3_VBUSVLDEXT BIT(6)
#define USBOTG3_CTRL3_VBUSVLDEXTSEL BIT(5)
#define USBOTG3_CTRL4 0x10
#define USBOTG3_CTRL7 0x1c
#define REF_SSP_EN BIT(16)
/* This value config the default txtune parameter of the usb 2.0 phy */
#define HI3660_USB_DEFAULT_PHY_PARAM 0x1c466e3
struct hi3660_priv {
struct device *dev;
struct regmap *peri_crg;
struct regmap *pctrl;
struct regmap *otg_bc;
u32 eye_diagram_param;
};
static int hi3660_phy_init(struct phy *phy)
{
struct hi3660_priv *priv = phy_get_drvdata(phy);
u32 val, mask;
int ret;
/* usb refclk iso disable */
ret = regmap_write(priv->peri_crg, PERI_CRG_ISODIS, USB_REFCLK_ISO_EN);
if (ret)
goto out;
/* enable usb_tcxo_en */
val = USB_TCXO_EN | (USB_TCXO_EN << PCTRL_PERI_CTRL3_MSK_START);
ret = regmap_write(priv->pctrl, PCTRL_PERI_CTRL3, val);
if (ret)
goto out;
/* assert phy */
val = IP_RST_USB3OTGPHY_POR | IP_RST_USB3OTG;
ret = regmap_write(priv->peri_crg, PERI_CRG_RSTEN4, val);
if (ret)
goto out;
/* enable phy ref clk */
val = SC_USB3PHY_ABB_GT_EN;
mask = val;
ret = regmap_update_bits(priv->otg_bc, USBOTG3_CTRL0, mask, val);
if (ret)
goto out;
val = REF_SSP_EN;
mask = val;
ret = regmap_update_bits(priv->otg_bc, USBOTG3_CTRL7, mask, val);
if (ret)
goto out;
/* exit from IDDQ mode */
mask = USBOTG3CTRL2_POWERDOWN_HSP | USBOTG3CTRL2_POWERDOWN_SSP;
ret = regmap_update_bits(priv->otg_bc, USBOTG3_CTRL2, mask, 0);
if (ret)
goto out;
/* delay for exit from IDDQ mode */
usleep_range(100, 120);
/* deassert phy */
val = IP_RST_USB3OTGPHY_POR | IP_RST_USB3OTG;
ret = regmap_write(priv->peri_crg, PERI_CRG_RSTDIS4, val);
if (ret)
goto out;
/* delay for phy deasserted */
usleep_range(10000, 15000);
/* fake vbus valid signal */
val = USBOTG3_CTRL3_VBUSVLDEXT | USBOTG3_CTRL3_VBUSVLDEXTSEL;
mask = val;
ret = regmap_update_bits(priv->otg_bc, USBOTG3_CTRL3, mask, val);
if (ret)
goto out;
/* delay for vbus valid */
usleep_range(100, 120);
ret = regmap_write(priv->otg_bc, USBOTG3_CTRL4,
priv->eye_diagram_param);
if (ret)
goto out;
return 0;
out:
dev_err(priv->dev, "failed to init phy ret: %d\n", ret);
return ret;
}
static int hi3660_phy_exit(struct phy *phy)
{
struct hi3660_priv *priv = phy_get_drvdata(phy);
u32 val;
int ret;
/* assert phy */
val = IP_RST_USB3OTGPHY_POR;
ret = regmap_write(priv->peri_crg, PERI_CRG_RSTEN4, val);
if (ret)
goto out;
/* disable usb_tcxo_en */
val = USB_TCXO_EN << PCTRL_PERI_CTRL3_MSK_START;
ret = regmap_write(priv->pctrl, PCTRL_PERI_CTRL3, val);
if (ret)
goto out;
return 0;
out:
dev_err(priv->dev, "failed to exit phy ret: %d\n", ret);
return ret;
}
static struct phy_ops hi3660_phy_ops = {
.init = hi3660_phy_init,
.exit = hi3660_phy_exit,
.owner = THIS_MODULE,
};
static int hi3660_phy_probe(struct platform_device *pdev)
{
struct phy_provider *phy_provider;
struct device *dev = &pdev->dev;
struct phy *phy;
struct hi3660_priv *priv;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = dev;
priv->peri_crg = syscon_regmap_lookup_by_phandle(dev->of_node,
"hisilicon,pericrg-syscon");
if (IS_ERR(priv->peri_crg)) {
dev_err(dev, "no hisilicon,pericrg-syscon\n");
return PTR_ERR(priv->peri_crg);
}
priv->pctrl = syscon_regmap_lookup_by_phandle(dev->of_node,
"hisilicon,pctrl-syscon");
if (IS_ERR(priv->pctrl)) {
dev_err(dev, "no hisilicon,pctrl-syscon\n");
return PTR_ERR(priv->pctrl);
}
/* node of hi3660 phy is a sub-node of usb3_otg_bc */
priv->otg_bc = syscon_node_to_regmap(dev->parent->of_node);
if (IS_ERR(priv->otg_bc)) {
dev_err(dev, "no hisilicon,usb3-otg-bc-syscon\n");
return PTR_ERR(priv->otg_bc);
}
if (of_property_read_u32(dev->of_node, "hisilicon,eye-diagram-param",
&(priv->eye_diagram_param)))
priv->eye_diagram_param = HI3660_USB_DEFAULT_PHY_PARAM;
phy = devm_phy_create(dev, NULL, &hi3660_phy_ops);
if (IS_ERR(phy))
return PTR_ERR(phy);
phy_set_drvdata(phy, priv);
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
return PTR_ERR_OR_ZERO(phy_provider);
}
static const struct of_device_id hi3660_phy_of_match[] = {
{.compatible = "hisilicon,hi3660-usb-phy",},
{ }
};
MODULE_DEVICE_TABLE(of, hi3660_phy_of_match);
static struct platform_driver hi3660_phy_driver = {
.probe = hi3660_phy_probe,
.driver = {
.name = "hi3660-usb-phy",
.of_match_table = hi3660_phy_of_match,
}
};
module_platform_driver(hi3660_phy_driver);
MODULE_AUTHOR("Yu Chen <chenyu56@huawei.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Hilisicon Hi3660 USB3 PHY Driver");
