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Commit 5578b266 authored by Valentine Barshak's avatar Valentine Barshak Committed by Felipe Balbi
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usb: phy: Add RCAR Gen2 USB phy 



This adds RCAR Gen2 USB phy support. The driver configures
USB channels 0/2 which are shared between PCI USB hosts and
USBHS/USBSS devices. It also controls internal USBHS phy.

Signed-off-by: default avatarValentine Barshak <valentine.barshak@cogentembedded.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent c5340bd1

drivers/usb/phy/Kconfig

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@@ -214,6 +214,19 @@ config USB_RCAR_PHY 
	  To compile this driver as a module, choose M here: the

	  module will be called phy-rcar-usb.



config USB_RCAR_GEN2_PHY

	tristate "Renesas R-Car Gen2 USB PHY support"

	depends on ARCH_R8A7790 || ARCH_R8A7791 || COMPILE_TEST

	select USB_PHY

	help

	  Say Y here to add support for the Renesas R-Car Gen2 USB PHY driver.

	  It is typically used to control internal USB PHY for USBHS,

	  and to configure shared USB channels 0 and 2.

	  This driver supports R8A7790 and R8A7791.



	  To compile this driver as a module, choose M here: the

	  module will be called phy-rcar-gen2-usb.



config USB_ULPI

	bool "Generic ULPI Transceiver Driver"

	depends on ARM

drivers/usb/phy/Makefile

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@@ -29,5 +29,6 @@ obj-$(CONFIG_USB_MSM_OTG) += phy-msm-usb.o 
obj-$(CONFIG_USB_MV_OTG)		+= phy-mv-usb.o

obj-$(CONFIG_USB_MXS_PHY)		+= phy-mxs-usb.o

obj-$(CONFIG_USB_RCAR_PHY)		+= phy-rcar-usb.o

obj-$(CONFIG_USB_RCAR_GEN2_PHY)		+= phy-rcar-gen2-usb.o

obj-$(CONFIG_USB_ULPI)			+= phy-ulpi.o

obj-$(CONFIG_USB_ULPI_VIEWPORT)		+= phy-ulpi-viewport.o

drivers/usb/phy/phy-rcar-gen2-usb.c

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/*

 * Renesas R-Car Gen2 USB phy driver

 *

 * Copyright (C) 2013 Renesas Solutions Corp.

 * Copyright (C) 2013 Cogent Embedded, Inc.

 *

 * 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.

 */



#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/io.h>

#include <linux/module.h>

#include <linux/platform_data/usb-rcar-gen2-phy.h>

#include <linux/platform_device.h>

#include <linux/spinlock.h>

#include <linux/usb/otg.h>



struct rcar_gen2_usb_phy_priv {

	struct usb_phy phy;

	void __iomem *base;

	struct clk *clk;

	spinlock_t lock;

	int usecount;

	u32 ugctrl2;

};



#define usb_phy_to_priv(p) container_of(p, struct rcar_gen2_usb_phy_priv, phy)



/* Low Power Status register */

#define USBHS_LPSTS_REG			0x02

#define USBHS_LPSTS_SUSPM		(1 << 14)



/* USB General control register */

#define USBHS_UGCTRL_REG		0x80

#define USBHS_UGCTRL_CONNECT		(1 << 2)

#define USBHS_UGCTRL_PLLRESET		(1 << 0)



/* USB General control register 2 */

#define USBHS_UGCTRL2_REG		0x84

#define USBHS_UGCTRL2_USB0_PCI		(1 << 4)

#define USBHS_UGCTRL2_USB0_HS		(3 << 4)

#define USBHS_UGCTRL2_USB2_PCI		(0 << 31)

#define USBHS_UGCTRL2_USB2_SS		(1 << 31)



/* USB General status register */

#define USBHS_UGSTS_REG			0x88

#define USBHS_UGSTS_LOCK		(3 << 8)



/* Enable USBHS internal phy */

static int __rcar_gen2_usbhs_phy_enable(void __iomem *base)

{

	u32 val;

	int i;



	/* USBHS PHY power on */

	val = ioread32(base + USBHS_UGCTRL_REG);

	val &= ~USBHS_UGCTRL_PLLRESET;

	iowrite32(val, base + USBHS_UGCTRL_REG);



	val = ioread16(base + USBHS_LPSTS_REG);

	val |= USBHS_LPSTS_SUSPM;

	iowrite16(val, base + USBHS_LPSTS_REG);



	for (i = 0; i < 20; i++) {

		val = ioread32(base + USBHS_UGSTS_REG);

		if ((val & USBHS_UGSTS_LOCK) == USBHS_UGSTS_LOCK) {

			val = ioread32(base + USBHS_UGCTRL_REG);

			val |= USBHS_UGCTRL_CONNECT;

			iowrite32(val, base + USBHS_UGCTRL_REG);

			return 0;

		}

		udelay(1);

	}



	/* Timed out waiting for the PLL lock */

	return -ETIMEDOUT;

}



/* Disable USBHS internal phy */

static int __rcar_gen2_usbhs_phy_disable(void __iomem *base)

{

	u32 val;



	/* USBHS PHY power off */

	val = ioread32(base + USBHS_UGCTRL_REG);

	val &= ~USBHS_UGCTRL_CONNECT;

	iowrite32(val, base + USBHS_UGCTRL_REG);



	val = ioread16(base + USBHS_LPSTS_REG);

	val &= ~USBHS_LPSTS_SUSPM;

	iowrite16(val, base + USBHS_LPSTS_REG);



	val = ioread32(base + USBHS_UGCTRL_REG);

	val |= USBHS_UGCTRL_PLLRESET;

	iowrite32(val, base + USBHS_UGCTRL_REG);

	return 0;

}



/* Setup USB channels */

static void __rcar_gen2_usb_phy_init(struct rcar_gen2_usb_phy_priv *priv)

{

	u32 val;



	clk_prepare_enable(priv->clk);



	/* Set USB channels in the USBHS UGCTRL2 register */

	val = ioread32(priv->base);

	val &= ~(USBHS_UGCTRL2_USB0_HS | USBHS_UGCTRL2_USB2_SS);

	val |= priv->ugctrl2;

	iowrite32(val, priv->base);

}



/* Shutdown USB channels */

static void __rcar_gen2_usb_phy_shutdown(struct rcar_gen2_usb_phy_priv *priv)

{

	__rcar_gen2_usbhs_phy_disable(priv->base);

	clk_disable_unprepare(priv->clk);

}



static int rcar_gen2_usb_phy_set_suspend(struct usb_phy *phy, int suspend)

{

	struct rcar_gen2_usb_phy_priv *priv = usb_phy_to_priv(phy);

	unsigned long flags;

	int retval;



	spin_lock_irqsave(&priv->lock, flags);

	retval = suspend ? __rcar_gen2_usbhs_phy_disable(priv->base) :

			   __rcar_gen2_usbhs_phy_enable(priv->base);

	spin_unlock_irqrestore(&priv->lock, flags);

	return retval;

}



static int rcar_gen2_usb_phy_init(struct usb_phy *phy)

{

	struct rcar_gen2_usb_phy_priv *priv = usb_phy_to_priv(phy);

	unsigned long flags;



	spin_lock_irqsave(&priv->lock, flags);

	/*

	 * Enable the clock and setup USB channels

	 * if it's the first user

	 */

	if (!priv->usecount++)

		__rcar_gen2_usb_phy_init(priv);

	spin_unlock_irqrestore(&priv->lock, flags);

	return 0;

}



static void rcar_gen2_usb_phy_shutdown(struct usb_phy *phy)

{

	struct rcar_gen2_usb_phy_priv *priv = usb_phy_to_priv(phy);

	unsigned long flags;



	spin_lock_irqsave(&priv->lock, flags);

	if (!priv->usecount) {

		dev_warn(phy->dev, "Trying to disable phy with 0 usecount\n");

		goto out;

	}



	/* Disable everything if it's the last user */

	if (!--priv->usecount)

		__rcar_gen2_usb_phy_shutdown(priv);

out:

	spin_unlock_irqrestore(&priv->lock, flags);

}



static int rcar_gen2_usb_phy_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct rcar_gen2_phy_platform_data *pdata;

	struct rcar_gen2_usb_phy_priv *priv;

	struct resource *res;

	void __iomem *base;

	struct clk *clk;

	int retval;



	pdata = dev_get_platdata(&pdev->dev);

	if (!pdata) {

		dev_err(dev, "No platform data\n");

		return -EINVAL;

	}



	clk = devm_clk_get(&pdev->dev, "usbhs");

	if (IS_ERR(clk)) {

		dev_err(&pdev->dev, "Can't get the clock\n");

		return PTR_ERR(clk);

	}



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	base = devm_ioremap_resource(dev, res);

	if (IS_ERR(base))

		return PTR_ERR(base);



	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);

	if (!priv) {

		dev_err(dev, "Memory allocation failed\n");

		return -ENOMEM;

	}



	spin_lock_init(&priv->lock);

	priv->clk = clk;

	priv->base = base;

	priv->ugctrl2 = pdata->chan0_pci ?

			USBHS_UGCTRL2_USB0_PCI : USBHS_UGCTRL2_USB0_HS;

	priv->ugctrl2 |= pdata->chan2_pci ?

			USBHS_UGCTRL2_USB2_PCI : USBHS_UGCTRL2_USB2_SS;

	priv->phy.dev = dev;

	priv->phy.label = dev_name(dev);

	priv->phy.init = rcar_gen2_usb_phy_init;

	priv->phy.shutdown = rcar_gen2_usb_phy_shutdown;

	priv->phy.set_suspend = rcar_gen2_usb_phy_set_suspend;



	retval = usb_add_phy(&priv->phy, USB_PHY_TYPE_USB2);

	if (retval < 0) {

		dev_err(dev, "Failed to add USB phy\n");

		return retval;

	}



	platform_set_drvdata(pdev, priv);



	return retval;

}



static int rcar_gen2_usb_phy_remove(struct platform_device *pdev)

{

	struct rcar_gen2_usb_phy_priv *priv = platform_get_drvdata(pdev);



	usb_remove_phy(&priv->phy);



	return 0;

}



static struct platform_driver rcar_gen2_usb_phy_driver = {

	.driver = {

		.name = "usb_phy_rcar_gen2",

	},

	.probe = rcar_gen2_usb_phy_probe,

	.remove = rcar_gen2_usb_phy_remove,

};



module_platform_driver(rcar_gen2_usb_phy_driver);



MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("Renesas R-Car Gen2 USB phy");

MODULE_AUTHOR("Valentine Barshak <valentine.barshak@cogentembedded.com>");

include/linux/platform_data/usb-rcar-gen2-phy.h

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/*

 * Copyright (C) 2013 Renesas Solutions Corp.

 * Copyright (C) 2013 Cogent Embedded, Inc.

 *

 * 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.

 */



#ifndef __USB_RCAR_GEN2_PHY_H

#define __USB_RCAR_GEN2_PHY_H



#include <linux/types.h>



struct rcar_gen2_phy_platform_data {

	/* USB channel 0 configuration */

	bool chan0_pci:1;	/* true: PCI USB host 0, false: USBHS */

	/* USB channel 2 configuration */

	bool chan2_pci:1;	/* true: PCI USB host 2, false: USBSS */

};



#endif