Commit 1789e52a authored by Kuninori Morimoto's avatar Kuninori Morimoto Committed by Felipe Balbi
Browse files

usb: phy: add R-Car USB phy driver 



This patch adds Renesas R-Car USB phy driver.
It supports R8A7779 chip at this point.

R-Car has some USB controllers, but has only one phy-initializer.
So, this driver is counting users.

Signed-off-by: default avatarKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent ca21dda6

drivers/usb/phy/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -32,3 +32,15 @@ config MV_U3D_PHY 
	help

	  Enable this to support Marvell USB 3.0 phy controller for Marvell

	  SoC.



config USB_RCAR_PHY

	tristate "Renesas R-Car USB phy support"

	depends on USB || USB_GADGET

	select USB_OTG_UTILS

	help

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

	  This chip is typically used as USB phy for USB host, gadget.

	  This driver supports: R8A7779



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

	  module will be called rcar-phy.

drivers/usb/phy/Makefile

+1 −0
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@@ -8,3 +8,4 @@ obj-$(CONFIG_OMAP_USB2) += omap-usb2.o 
obj-$(CONFIG_USB_ISP1301)		+= isp1301.o

obj-$(CONFIG_MV_U3D_PHY)		+= mv_u3d_phy.o

obj-$(CONFIG_USB_EHCI_TEGRA)	+= tegra_usb_phy.o

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

drivers/usb/phy/rcar-phy.c

0 → 100644
+220 −0
Original line number Diff line number Diff line 
/*

 * Renesas R-Car USB phy driver

 *

 * Copyright (C) 2012 Renesas Solutions Corp.

 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.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.

 */



#include <linux/delay.h>

#include <linux/io.h>

#include <linux/usb/otg.h>

#include <linux/platform_device.h>

#include <linux/spinlock.h>

#include <linux/module.h>



/* USBH common register */

#define USBPCTRL0	0x0800

#define USBPCTRL1	0x0804

#define USBST		0x0808

#define USBEH0		0x080C

#define USBOH0		0x081C

#define USBCTL0		0x0858

#define EIIBC1		0x0094

#define EIIBC2		0x009C



/* USBPCTRL1 */

#define PHY_RST		(1 << 2)

#define PLL_ENB		(1 << 1)

#define PHY_ENB		(1 << 0)



/* USBST */

#define ST_ACT		(1 << 31)

#define ST_PLL		(1 << 30)



struct rcar_usb_phy_priv {

	struct usb_phy phy;

	spinlock_t lock;



	void __iomem *reg0;

	void __iomem *reg1;

	int counter;

};



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





/*

 * USB initial/install operation.

 *

 * This function setup USB phy.

 * The used value and setting order came from

 * [USB :: Initial setting] on datasheet.

 */

static int rcar_usb_phy_init(struct usb_phy *phy)

{

	struct rcar_usb_phy_priv *priv = usb_phy_to_priv(phy);

	struct device *dev = phy->dev;

	void __iomem *reg0 = priv->reg0;

	void __iomem *reg1 = priv->reg1;

	int i;

	u32 val;

	unsigned long flags;



	spin_lock_irqsave(&priv->lock, flags);

	if (priv->counter++ == 0) {



		/*

		 * USB phy start-up

		 */



		/* (1) USB-PHY standby release */

		iowrite32(PHY_ENB, (reg0 + USBPCTRL1));



		/* (2) start USB-PHY internal PLL */

		iowrite32(PHY_ENB | PLL_ENB, (reg0 + USBPCTRL1));



		/* (3) USB module status check */

		for (i = 0; i < 1024; i++) {

			udelay(10);

			val = ioread32(reg0 + USBST);

			if (val == (ST_ACT | ST_PLL))

				break;

		}



		if (val != (ST_ACT | ST_PLL)) {

			dev_err(dev, "USB phy not ready\n");

			goto phy_init_end;

		}



		/* (4) USB-PHY reset clear */

		iowrite32(PHY_ENB | PLL_ENB | PHY_RST, (reg0 + USBPCTRL1));



		/* set platform specific port settings */

		iowrite32(0x00000000, (reg0 + USBPCTRL0));



		/*

		 * EHCI IP internal buffer setting

		 * EHCI IP internal buffer enable

		 *

		 * These are recommended value of a datasheet

		 * see [USB :: EHCI internal buffer setting]

		 */

		iowrite32(0x00ff0040, (reg0 + EIIBC1));

		iowrite32(0x00ff0040, (reg1 + EIIBC1));



		iowrite32(0x00000001, (reg0 + EIIBC2));

		iowrite32(0x00000001, (reg1 + EIIBC2));



		/*

		 * Bus alignment settings

		 */



		/* (1) EHCI bus alignment (little endian) */

		iowrite32(0x00000000, (reg0 + USBEH0));



		/* (1) OHCI bus alignment (little endian) */

		iowrite32(0x00000000, (reg0 + USBOH0));

	}



phy_init_end:

	spin_unlock_irqrestore(&priv->lock, flags);



	return 0;

}



static void rcar_usb_phy_shutdown(struct usb_phy *phy)

{

	struct rcar_usb_phy_priv *priv = usb_phy_to_priv(phy);

	void __iomem *reg0 = priv->reg0;

	unsigned long flags;



	spin_lock_irqsave(&priv->lock, flags);



	if (priv->counter-- == 1) { /* last user */

		iowrite32(0x00000000, (reg0 + USBPCTRL0));

		iowrite32(0x00000000, (reg0 + USBPCTRL1));

	}



	spin_unlock_irqrestore(&priv->lock, flags);

}



static int __devinit rcar_usb_phy_probe(struct platform_device *pdev)

{

	struct rcar_usb_phy_priv *priv;

	struct resource *res0, *res1;

	struct device *dev = &pdev->dev;

	void __iomem *reg0, *reg1;

	int ret;



	res0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);

	if (!res0 || !res1) {

		dev_err(dev, "Not enough platform resources\n");

		return -EINVAL;

	}



	/*

	 * CAUTION

	 *

	 * Because this phy address is also mapped under OHCI/EHCI address area,

	 * this driver can't use devm_request_and_ioremap(dev, res) here

	 */

	reg0 = devm_ioremap_nocache(dev, res0->start, resource_size(res0));

	reg1 = devm_ioremap_nocache(dev, res1->start, resource_size(res1));

	if (!reg0 || !reg1) {

		dev_err(dev, "ioremap error\n");

		return -ENOMEM;

	}



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

	if (!priv) {

		dev_err(dev, "priv data allocation error\n");

		return -ENOMEM;

	}



	priv->reg0		= reg0;

	priv->reg1		= reg1;

	priv->counter		= 0;

	priv->phy.dev		= dev;

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

	priv->phy.init		= rcar_usb_phy_init;

	priv->phy.shutdown	= rcar_usb_phy_shutdown;

	spin_lock_init(&priv->lock);



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

	if (ret < 0) {

		dev_err(dev, "usb phy addition error\n");

		return ret;

	}



	platform_set_drvdata(pdev, priv);



	return ret;

}



static int __devexit rcar_usb_phy_remove(struct platform_device *pdev)

{

	struct rcar_usb_phy_priv *priv = platform_get_drvdata(pdev);



	usb_remove_phy(&priv->phy);



	return 0;

}



static struct platform_driver rcar_usb_phy_driver = {

	.driver		= {

		.name	= "rcar_usb_phy",

	},

	.probe		= rcar_usb_phy_probe,

	.remove		= __devexit_p(rcar_usb_phy_remove),

};



module_platform_driver(rcar_usb_phy_driver);



MODULE_LICENSE("GPL v2");

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

MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");

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