Commit a67e76ac authored by Yu Xu's avatar Yu Xu Committed by Felipe Balbi
Browse files

usb: phy: mv_u3d: Add usb phy driver for mv_u3d 



The driver supports phy_init and phy_shutdown functions to
enable and disable phy for Marvell USB 3.0 controller.

Signed-off-by: default avatarYu Xu <yuxu@marvell.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent df6791d7

drivers/usb/phy/Kconfig

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@@ -15,3 +15,11 @@ config USB_ISP1301 


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

	  module will be called isp1301.



config MV_U3D_PHY

	bool "Marvell USB 3.0 PHY controller Driver"

	depends on USB_MV_U3D

	select USB_OTG_UTILS

	help

	  Enable this to support Marvell USB 3.0 phy controller for Marvell

	  SoC.

drivers/usb/phy/Makefile

+1 −0
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@@ -5,3 +5,4 @@ 
ccflags-$(CONFIG_USB_DEBUG) := -DDEBUG



obj-$(CONFIG_USB_ISP1301)		+= isp1301.o

obj-$(CONFIG_MV_U3D_PHY)		+= mv_u3d_phy.o

drivers/usb/phy/mv_u3d_phy.c

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/*

 * Copyright (C) 2011 Marvell International Ltd. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 */



#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/usb/otg.h>

#include <linux/platform_data/mv_usb.h>



#include "mv_u3d_phy.h"



/*

 * struct mv_u3d_phy - transceiver driver state

 * @phy: transceiver structure

 * @dev: The parent device supplied to the probe function

 * @clk: usb phy clock

 * @base: usb phy register memory base

 */

struct mv_u3d_phy {

	struct usb_phy	phy;

	struct mv_usb_platform_data *plat;

	struct device	*dev;

	struct clk	*clk;

	void __iomem	*base;

};



static u32 mv_u3d_phy_read(void __iomem *base, u32 reg)

{

	void __iomem *addr, *data;



	addr = base;

	data = base + 0x4;



	writel_relaxed(reg, addr);

	return readl_relaxed(data);

}



static void mv_u3d_phy_set(void __iomem *base, u32 reg, u32 value)

{

	void __iomem *addr, *data;

	u32 tmp;



	addr = base;

	data = base + 0x4;



	writel_relaxed(reg, addr);

	tmp = readl_relaxed(data);

	tmp |= value;

	writel_relaxed(tmp, data);

}



static void mv_u3d_phy_clear(void __iomem *base, u32 reg, u32 value)

{

	void __iomem *addr, *data;

	u32 tmp;



	addr = base;

	data = base + 0x4;



	writel_relaxed(reg, addr);

	tmp = readl_relaxed(data);

	tmp &= ~value;

	writel_relaxed(tmp, data);

}



static void mv_u3d_phy_write(void __iomem *base, u32 reg, u32 value)

{

	void __iomem *addr, *data;



	addr = base;

	data = base + 0x4;



	writel_relaxed(reg, addr);

	writel_relaxed(value, data);

}



void mv_u3d_phy_shutdown(struct usb_phy *phy)

{

	struct mv_u3d_phy *mv_u3d_phy;

	void __iomem *base;

	u32 val;



	mv_u3d_phy = container_of(phy, struct mv_u3d_phy, phy);

	base = mv_u3d_phy->base;



	/* Power down Reference Analog current, bit 15

	 * Power down PLL, bit 14

	 * Power down Receiver, bit 13

	 * Power down Transmitter, bit 12

	 * of USB3_POWER_PLL_CONTROL register

	 */

	val = mv_u3d_phy_read(base, USB3_POWER_PLL_CONTROL);

	val &= ~(USB3_POWER_PLL_CONTROL_PU);

	mv_u3d_phy_write(base, USB3_POWER_PLL_CONTROL, val);



	if (mv_u3d_phy->clk)

		clk_disable(mv_u3d_phy->clk);

}



static int mv_u3d_phy_init(struct usb_phy *phy)

{

	struct mv_u3d_phy *mv_u3d_phy;

	void __iomem *base;

	u32 val, count;



	/* enable usb3 phy */

	mv_u3d_phy = container_of(phy, struct mv_u3d_phy, phy);



	if (mv_u3d_phy->clk)

		clk_enable(mv_u3d_phy->clk);



	base = mv_u3d_phy->base;



	val = mv_u3d_phy_read(base, USB3_POWER_PLL_CONTROL);

	val &= ~(USB3_POWER_PLL_CONTROL_PU_MASK);

	val |= 0xF << USB3_POWER_PLL_CONTROL_PU_SHIFT;

	mv_u3d_phy_write(base, USB3_POWER_PLL_CONTROL, val);

	udelay(100);



	mv_u3d_phy_write(base, USB3_RESET_CONTROL,

			USB3_RESET_CONTROL_RESET_PIPE);

	udelay(100);



	mv_u3d_phy_write(base, USB3_RESET_CONTROL,

			USB3_RESET_CONTROL_RESET_PIPE

			| USB3_RESET_CONTROL_RESET_PHY);

	udelay(100);



	val = mv_u3d_phy_read(base, USB3_POWER_PLL_CONTROL);

	val &= ~(USB3_POWER_PLL_CONTROL_REF_FREF_SEL_MASK

		| USB3_POWER_PLL_CONTROL_PHY_MODE_MASK);

	val |=  (USB3_PLL_25MHZ << USB3_POWER_PLL_CONTROL_REF_FREF_SEL_SHIFT)

		| (0x5 << USB3_POWER_PLL_CONTROL_PHY_MODE_SHIFT);

	mv_u3d_phy_write(base, USB3_POWER_PLL_CONTROL, val);

	udelay(100);



	mv_u3d_phy_clear(base, USB3_KVCO_CALI_CONTROL,

		USB3_KVCO_CALI_CONTROL_USE_MAX_PLL_RATE_MASK);

	udelay(100);



	val = mv_u3d_phy_read(base, USB3_SQUELCH_FFE);

	val &= ~(USB3_SQUELCH_FFE_FFE_CAP_SEL_MASK

		| USB3_SQUELCH_FFE_FFE_RES_SEL_MASK

		| USB3_SQUELCH_FFE_SQ_THRESH_IN_MASK);

	val |= ((0xD << USB3_SQUELCH_FFE_FFE_CAP_SEL_SHIFT)

		| (0x7 << USB3_SQUELCH_FFE_FFE_RES_SEL_SHIFT)

		| (0x8 << USB3_SQUELCH_FFE_SQ_THRESH_IN_SHIFT));

	mv_u3d_phy_write(base, USB3_SQUELCH_FFE, val);

	udelay(100);



	val = mv_u3d_phy_read(base, USB3_GEN1_SET0);

	val &= ~USB3_GEN1_SET0_G1_TX_SLEW_CTRL_EN_MASK;

	val |= 1 << USB3_GEN1_SET0_G1_TX_EMPH_EN_SHIFT;

	mv_u3d_phy_write(base, USB3_GEN1_SET0, val);

	udelay(100);



	val = mv_u3d_phy_read(base, USB3_GEN2_SET0);

	val &= ~(USB3_GEN2_SET0_G2_TX_AMP_MASK

		| USB3_GEN2_SET0_G2_TX_EMPH_AMP_MASK

		| USB3_GEN2_SET0_G2_TX_SLEW_CTRL_EN_MASK);

	val |= ((0x14 << USB3_GEN2_SET0_G2_TX_AMP_SHIFT)

		| (1 << USB3_GEN2_SET0_G2_TX_AMP_ADJ_SHIFT)

		| (0xA << USB3_GEN2_SET0_G2_TX_EMPH_AMP_SHIFT)

		| (1 << USB3_GEN2_SET0_G2_TX_EMPH_EN_SHIFT));

	mv_u3d_phy_write(base, USB3_GEN2_SET0, val);

	udelay(100);



	mv_u3d_phy_read(base, USB3_TX_EMPPH);

	val &= ~(USB3_TX_EMPPH_AMP_MASK

		| USB3_TX_EMPPH_EN_MASK

		| USB3_TX_EMPPH_AMP_FORCE_MASK

		| USB3_TX_EMPPH_PAR1_MASK

		| USB3_TX_EMPPH_PAR2_MASK);

	val |= ((0xB << USB3_TX_EMPPH_AMP_SHIFT)

		| (1 << USB3_TX_EMPPH_EN_SHIFT)

		| (1 << USB3_TX_EMPPH_AMP_FORCE_SHIFT)

		| (0x1C << USB3_TX_EMPPH_PAR1_SHIFT)

		| (1 << USB3_TX_EMPPH_PAR2_SHIFT));



	mv_u3d_phy_write(base, USB3_TX_EMPPH, val);

	udelay(100);



	val = mv_u3d_phy_read(base, USB3_GEN2_SET1);

	val &= ~(USB3_GEN2_SET1_G2_RX_SELMUPI_MASK

		| USB3_GEN2_SET1_G2_RX_SELMUPF_MASK

		| USB3_GEN2_SET1_G2_RX_SELMUFI_MASK

		| USB3_GEN2_SET1_G2_RX_SELMUFF_MASK);

	val |= ((1 << USB3_GEN2_SET1_G2_RX_SELMUPI_SHIFT)

		| (1 << USB3_GEN2_SET1_G2_RX_SELMUPF_SHIFT)

		| (1 << USB3_GEN2_SET1_G2_RX_SELMUFI_SHIFT)

		| (1 << USB3_GEN2_SET1_G2_RX_SELMUFF_SHIFT));

	mv_u3d_phy_write(base, USB3_GEN2_SET1, val);

	udelay(100);



	val = mv_u3d_phy_read(base, USB3_DIGITAL_LOOPBACK_EN);

	val &= ~USB3_DIGITAL_LOOPBACK_EN_SEL_BITS_MASK;

	val |= 1 << USB3_DIGITAL_LOOPBACK_EN_SEL_BITS_SHIFT;

	mv_u3d_phy_write(base, USB3_DIGITAL_LOOPBACK_EN, val);

	udelay(100);



	val = mv_u3d_phy_read(base, USB3_IMPEDANCE_TX_SSC);

	val &= ~USB3_IMPEDANCE_TX_SSC_SSC_AMP_MASK;

	val |= 0xC << USB3_IMPEDANCE_TX_SSC_SSC_AMP_SHIFT;

	mv_u3d_phy_write(base, USB3_IMPEDANCE_TX_SSC, val);

	udelay(100);



	val = mv_u3d_phy_read(base, USB3_IMPEDANCE_CALI_CTRL);

	val &= ~USB3_IMPEDANCE_CALI_CTRL_IMP_CAL_THR_MASK;

	val |= 0x4 << USB3_IMPEDANCE_CALI_CTRL_IMP_CAL_THR_SHIFT;

	mv_u3d_phy_write(base, USB3_IMPEDANCE_CALI_CTRL, val);

	udelay(100);



	val = mv_u3d_phy_read(base, USB3_PHY_ISOLATION_MODE);

	val &= ~(USB3_PHY_ISOLATION_MODE_PHY_GEN_RX_MASK

		| USB3_PHY_ISOLATION_MODE_PHY_GEN_TX_MASK

		| USB3_PHY_ISOLATION_MODE_TX_DRV_IDLE_MASK);

	val |= ((1 << USB3_PHY_ISOLATION_MODE_PHY_GEN_RX_SHIFT)

		| (1 << USB3_PHY_ISOLATION_MODE_PHY_GEN_TX_SHIFT));

	mv_u3d_phy_write(base, USB3_PHY_ISOLATION_MODE, val);

	udelay(100);



	val = mv_u3d_phy_read(base, USB3_TXDETRX);

	val &= ~(USB3_TXDETRX_VTHSEL_MASK);

	val |= 0x1 << USB3_TXDETRX_VTHSEL_SHIFT;

	mv_u3d_phy_write(base, USB3_TXDETRX, val);

	udelay(100);



	dev_dbg(mv_u3d_phy->dev, "start calibration\n");



calstart:

	/* Perform Manual Calibration */

	mv_u3d_phy_set(base, USB3_KVCO_CALI_CONTROL,

		1 << USB3_KVCO_CALI_CONTROL_CAL_START_SHIFT);



	mdelay(1);



	count = 0;

	while (1) {

		val = mv_u3d_phy_read(base, USB3_KVCO_CALI_CONTROL);

		if (val & (1 << USB3_KVCO_CALI_CONTROL_CAL_DONE_SHIFT))

			break;

		else if (count > 50) {

			dev_dbg(mv_u3d_phy->dev, "calibration failure, retry...\n");

			goto calstart;

		}

		count++;

		mdelay(1);

	}



	/* active PIPE interface */

	mv_u3d_phy_write(base, USB3_PIPE_SM_CTRL,

		1 << USB3_PIPE_SM_CTRL_PHY_INIT_DONE);



	return 0;

}



static int __devinit mv_u3d_phy_probe(struct platform_device *pdev)

{

	struct mv_u3d_phy *mv_u3d_phy;

	struct mv_usb_platform_data *pdata;

	struct device *dev = &pdev->dev;

	struct resource *res;

	void __iomem	*phy_base;

	int	ret;



	pdata = pdev->dev.platform_data;

	if (!pdata) {

		dev_err(&pdev->dev, "%s: no platform data defined\n", __func__);

		return -EINVAL;

	}



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res) {

		dev_err(dev, "missing mem resource\n");

		return -ENODEV;

	}



	phy_base = devm_request_and_ioremap(dev, res);

	if (!phy_base) {

		dev_err(dev, "%s: register mapping failed\n", __func__);

		return -ENXIO;

	}



	mv_u3d_phy = devm_kzalloc(dev, sizeof(*mv_u3d_phy), GFP_KERNEL);

	if (!mv_u3d_phy)

		return -ENOMEM;



	mv_u3d_phy->dev			= &pdev->dev;

	mv_u3d_phy->plat		= pdata;

	mv_u3d_phy->base		= phy_base;

	mv_u3d_phy->phy.dev		= mv_u3d_phy->dev;

	mv_u3d_phy->phy.label		= "mv-u3d-phy";

	mv_u3d_phy->phy.init		= mv_u3d_phy_init;

	mv_u3d_phy->phy.shutdown	= mv_u3d_phy_shutdown;



	ret = usb_add_phy(&mv_u3d_phy->phy, USB_PHY_TYPE_USB3);

	if (ret)

		goto err;



	if (!mv_u3d_phy->clk)

		mv_u3d_phy->clk = clk_get(mv_u3d_phy->dev, "u3dphy");



	platform_set_drvdata(pdev, mv_u3d_phy);



	dev_info(&pdev->dev, "Initialized Marvell USB 3.0 PHY\n");

err:

	return ret;

}



static int __exit mv_u3d_phy_remove(struct platform_device *pdev)

{

	struct mv_u3d_phy *mv_u3d_phy = platform_get_drvdata(pdev);



	usb_remove_phy(&mv_u3d_phy->phy);



	if (mv_u3d_phy->clk) {

		clk_put(mv_u3d_phy->clk);

		mv_u3d_phy->clk = NULL;

	}



	return 0;

}



static struct platform_driver mv_u3d_phy_driver = {

	.probe		= mv_u3d_phy_probe,

	.remove		= __devexit_p(mv_u3d_phy_remove),

	.driver		= {

		.name	= "mv-u3d-phy",

		.owner	= THIS_MODULE,

	},

};



module_platform_driver(mv_u3d_phy_driver);

MODULE_DESCRIPTION("Marvell USB 3.0 PHY controller");

MODULE_AUTHOR("Yu Xu <yuxu@marvell.com>");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:mv-u3d-phy");

drivers/usb/phy/mv_u3d_phy.h

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/*

 * Copyright (C) 2011 Marvell International Ltd. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 */



#ifndef __MV_U3D_PHY_H

#define __MV_U3D_PHY_H



#define USB3_POWER_PLL_CONTROL		0x1

#define USB3_KVCO_CALI_CONTROL		0x2

#define USB3_IMPEDANCE_CALI_CTRL	0x3

#define USB3_IMPEDANCE_TX_SSC		0x4

#define USB3_SQUELCH_FFE		0x6

#define USB3_GEN1_SET0			0xD

#define USB3_GEN2_SET0			0xF

#define USB3_GEN2_SET1			0x10

#define USB3_DIGITAL_LOOPBACK_EN	0x23

#define USB3_PHY_ISOLATION_MODE		0x26

#define USB3_TXDETRX			0x48

#define USB3_TX_EMPPH			0x5E

#define USB3_RESET_CONTROL		0x90

#define USB3_PIPE_SM_CTRL		0x91



#define USB3_RESET_CONTROL_RESET_PIPE			0x1

#define USB3_RESET_CONTROL_RESET_PHY			0x2



#define USB3_POWER_PLL_CONTROL_REF_FREF_SEL_MASK	(0x1F << 0)

#define USB3_POWER_PLL_CONTROL_REF_FREF_SEL_SHIFT	0

#define USB3_PLL_25MHZ					0x2

#define USB3_PLL_26MHZ					0x5

#define USB3_POWER_PLL_CONTROL_PHY_MODE_MASK		(0x7 << 5)

#define USB3_POWER_PLL_CONTROL_PHY_MODE_SHIFT		5

#define USB3_POWER_PLL_CONTROL_PU_MASK			(0xF << 12)

#define USB3_POWER_PLL_CONTROL_PU_SHIFT			12

#define USB3_POWER_PLL_CONTROL_PU			(0xF << 12)



#define USB3_KVCO_CALI_CONTROL_USE_MAX_PLL_RATE_MASK	(0x1 << 12)

#define USB3_KVCO_CALI_CONTROL_USE_MAX_PLL_RATE_SHIFT	12

#define USB3_KVCO_CALI_CONTROL_CAL_DONE_SHIFT		14

#define USB3_KVCO_CALI_CONTROL_CAL_START_SHIFT		15



#define USB3_SQUELCH_FFE_FFE_CAP_SEL_MASK		0xF

#define USB3_SQUELCH_FFE_FFE_CAP_SEL_SHIFT		0

#define USB3_SQUELCH_FFE_FFE_RES_SEL_MASK		(0x7 << 4)

#define USB3_SQUELCH_FFE_FFE_RES_SEL_SHIFT		4

#define USB3_SQUELCH_FFE_SQ_THRESH_IN_MASK		(0x1F << 8)

#define USB3_SQUELCH_FFE_SQ_THRESH_IN_SHIFT		8



#define USB3_GEN1_SET0_G1_TX_SLEW_CTRL_EN_MASK		(0x1 << 15)

#define USB3_GEN1_SET0_G1_TX_EMPH_EN_SHIFT		11



#define USB3_GEN2_SET0_G2_TX_AMP_MASK			(0x1F << 1)

#define USB3_GEN2_SET0_G2_TX_AMP_SHIFT			1

#define USB3_GEN2_SET0_G2_TX_AMP_ADJ_SHIFT		6

#define USB3_GEN2_SET0_G2_TX_EMPH_AMP_MASK		(0xF << 7)

#define USB3_GEN2_SET0_G2_TX_EMPH_AMP_SHIFT		7

#define USB3_GEN2_SET0_G2_TX_EMPH_EN_MASK		(0x1 << 11)

#define USB3_GEN2_SET0_G2_TX_EMPH_EN_SHIFT		11

#define USB3_GEN2_SET0_G2_TX_SLEW_CTRL_EN_MASK		(0x1 << 15)

#define USB3_GEN2_SET0_G2_TX_SLEW_CTRL_EN_SHIFT		15



#define USB3_GEN2_SET1_G2_RX_SELMUPI_MASK		(0x7 << 0)

#define USB3_GEN2_SET1_G2_RX_SELMUPI_SHIFT		0

#define USB3_GEN2_SET1_G2_RX_SELMUPF_MASK		(0x7 << 3)

#define USB3_GEN2_SET1_G2_RX_SELMUPF_SHIFT		3

#define USB3_GEN2_SET1_G2_RX_SELMUFI_MASK		(0x3 << 6)

#define USB3_GEN2_SET1_G2_RX_SELMUFI_SHIFT		6

#define USB3_GEN2_SET1_G2_RX_SELMUFF_MASK		(0x3 << 8)

#define USB3_GEN2_SET1_G2_RX_SELMUFF_SHIFT		8



#define USB3_DIGITAL_LOOPBACK_EN_SEL_BITS_MASK		(0x3 << 10)

#define USB3_DIGITAL_LOOPBACK_EN_SEL_BITS_SHIFT		10



#define USB3_IMPEDANCE_CALI_CTRL_IMP_CAL_THR_MASK	(0x7 << 12)

#define USB3_IMPEDANCE_CALI_CTRL_IMP_CAL_THR_SHIFT	12



#define USB3_IMPEDANCE_TX_SSC_SSC_AMP_MASK		(0x3F << 0)

#define USB3_IMPEDANCE_TX_SSC_SSC_AMP_SHIFT		0



#define USB3_PHY_ISOLATION_MODE_PHY_GEN_RX_MASK		0xF

#define USB3_PHY_ISOLATION_MODE_PHY_GEN_RX_SHIFT	0

#define USB3_PHY_ISOLATION_MODE_PHY_GEN_TX_MASK		(0xF << 4)

#define USB3_PHY_ISOLATION_MODE_PHY_GEN_TX_SHIFT	4

#define USB3_PHY_ISOLATION_MODE_TX_DRV_IDLE_MASK	(0x1 << 8)



#define USB3_TXDETRX_VTHSEL_MASK			(0x3 << 4)

#define USB3_TXDETRX_VTHSEL_SHIFT			4



#define USB3_TX_EMPPH_AMP_MASK				(0xF << 0)

#define USB3_TX_EMPPH_AMP_SHIFT				0

#define USB3_TX_EMPPH_EN_MASK				(0x1 << 6)

#define USB3_TX_EMPPH_EN_SHIFT				6

#define USB3_TX_EMPPH_AMP_FORCE_MASK			(0x1 << 7)

#define USB3_TX_EMPPH_AMP_FORCE_SHIFT			7

#define USB3_TX_EMPPH_PAR1_MASK				(0x1F << 8)

#define USB3_TX_EMPPH_PAR1_SHIFT			8

#define USB3_TX_EMPPH_PAR2_MASK				(0x1 << 13)

#define USB3_TX_EMPPH_PAR2_SHIFT			13



#define USB3_PIPE_SM_CTRL_PHY_INIT_DONE			15



#endif /* __MV_U3D_PHY_H */

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