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Commit 94e487a4 authored by Yu Chen's avatar Yu Chen Committed by Kishon Vijay Abraham I
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phy: Add usb phy support for hi3660 Soc of Hisilicon 



This driver handles usb phy power on and shutdown for hi3660 Soc of
Hisilicon.

Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Pengcheng Li <lpc.li@hisilicon.com>
Cc: Jianguo Sun <sunjianguo1@huawei.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Jiancheng Xue <xuejiancheng@hisilicon.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Binghui Wang <wangbinghui@hisilicon.com>
Reviewed-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: default avatarYu Chen <chenyu56@huawei.com>
Signed-off-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
parent e4d0cf63

MAINTAINERS

+8 −0
Original line number Diff line number Diff line
@@ -16079,6 +16079,14 @@ L: linux-usb@vger.kernel.org 
S:	Maintained

F:	drivers/usb/roles/intel-xhci-usb-role-switch.c



USB IP DRIVER FOR HISILICON KIRIN

M:	Yu Chen <chenyu56@huawei.com>

M:	Binghui Wang <wangbinghui@hisilicon.com>

L:	linux-usb@vger.kernel.org

S:	Maintained

F:	Documentation/devicetree/bindings/phy/phy-hi3660-usb3.txt

F:	drivers/phy/hisilicon/phy-hi3660-usb3.c



USB ISP116X DRIVER

M:	Olav Kongas <ok@artecdesign.ee>

L:	linux-usb@vger.kernel.org

drivers/phy/hisilicon/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -12,6 +12,16 @@ config PHY_HI6220_USB 


	  To compile this driver as a module, choose M here.



config PHY_HI3660_USB

	tristate "hi3660 USB PHY support"

	depends on (ARCH_HISI && ARM64) || COMPILE_TEST

	select GENERIC_PHY

	select MFD_SYSCON

	help

	  Enable this to support the HISILICON HI3660 USB PHY.



	  To compile this driver as a module, choose M here.



config PHY_HISTB_COMBPHY

	tristate "HiSilicon STB SoCs COMBPHY support"

	depends on (ARCH_HISI && ARM64) || COMPILE_TEST

drivers/phy/hisilicon/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_PHY_HI6220_USB)		+= phy-hi6220-usb.o

obj-$(CONFIG_PHY_HI3660_USB)		+= phy-hi3660-usb3.o

obj-$(CONFIG_PHY_HISTB_COMBPHY)		+= phy-histb-combphy.o

obj-$(CONFIG_PHY_HISI_INNO_USB2)	+= phy-hisi-inno-usb2.o

obj-$(CONFIG_PHY_HIX5HD2_SATA)		+= phy-hix5hd2-sata.o

drivers/phy/hisilicon/phy-hi3660-usb3.c

0 → 100644
+233 −0
Original line number Diff line number Diff line 
// 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");