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Commit 644930cb authored by Lubomir Rintel's avatar Lubomir Rintel Committed by Greg Kroah-Hartman
Browse files

phy: phy-pxa-usb: add a new driver 



Turned from arch/arm/mach-mmp/devices.c into a proper PHY driver, so
that in can be instantiated from a DT.

Acked-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: default avatarLubomir Rintel <lkundrak@v3.sk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 89303c7e

drivers/phy/marvell/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -59,3 +59,14 @@ config PHY_PXA_28NM_USB2 
	  The PHY driver will be used by Marvell udc/ehci/otg driver.



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



config PHY_PXA_USB

	tristate "Marvell PXA USB PHY Driver"

	depends on ARCH_PXA || ARCH_MMP

	select GENERIC_PHY

	help

	  Enable this to support Marvell PXA USB PHY driver for Marvell

	  SoC. This driver will do the PHY initialization and shutdown.

	  The PHY driver will be used by Marvell udc/ehci/otg driver.



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

drivers/phy/marvell/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -6,3 +6,4 @@ obj-$(CONFIG_PHY_MVEBU_CP110_COMPHY) += phy-mvebu-cp110-comphy.o 
obj-$(CONFIG_PHY_MVEBU_SATA)		+= phy-mvebu-sata.o

obj-$(CONFIG_PHY_PXA_28NM_HSIC)		+= phy-pxa-28nm-hsic.o

obj-$(CONFIG_PHY_PXA_28NM_USB2)		+= phy-pxa-28nm-usb2.o

obj-$(CONFIG_PHY_PXA_USB)		+= phy-pxa-usb.o

drivers/phy/marvell/phy-pxa-usb.c

0 → 100644
+345 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

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

 * Copyright (C) 2018 Lubomir Rintel <lkundrak@v3.sk>

 */



#include <dt-bindings/phy/phy.h>

#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/io.h>

#include <linux/module.h>

#include <linux/of_address.h>

#include <linux/phy/phy.h>

#include <linux/platform_device.h>



/* phy regs */

#define UTMI_REVISION		0x0

#define UTMI_CTRL		0x4

#define UTMI_PLL		0x8

#define UTMI_TX			0xc

#define UTMI_RX			0x10

#define UTMI_IVREF		0x14

#define UTMI_T0			0x18

#define UTMI_T1			0x1c

#define UTMI_T2			0x20

#define UTMI_T3			0x24

#define UTMI_T4			0x28

#define UTMI_T5			0x2c

#define UTMI_RESERVE		0x30

#define UTMI_USB_INT		0x34

#define UTMI_DBG_CTL		0x38

#define UTMI_OTG_ADDON		0x3c



/* For UTMICTRL Register */

#define UTMI_CTRL_USB_CLK_EN                    (1 << 31)

/* pxa168 */

#define UTMI_CTRL_SUSPEND_SET1                  (1 << 30)

#define UTMI_CTRL_SUSPEND_SET2                  (1 << 29)

#define UTMI_CTRL_RXBUF_PDWN                    (1 << 24)

#define UTMI_CTRL_TXBUF_PDWN                    (1 << 11)



#define UTMI_CTRL_INPKT_DELAY_SHIFT             30

#define UTMI_CTRL_INPKT_DELAY_SOF_SHIFT		28

#define UTMI_CTRL_PU_REF_SHIFT			20

#define UTMI_CTRL_ARC_PULLDN_SHIFT              12

#define UTMI_CTRL_PLL_PWR_UP_SHIFT              1

#define UTMI_CTRL_PWR_UP_SHIFT                  0



/* For UTMI_PLL Register */

#define UTMI_PLL_PLLCALI12_SHIFT		29

#define UTMI_PLL_PLLCALI12_MASK			(0x3 << 29)



#define UTMI_PLL_PLLVDD18_SHIFT			27

#define UTMI_PLL_PLLVDD18_MASK			(0x3 << 27)



#define UTMI_PLL_PLLVDD12_SHIFT			25

#define UTMI_PLL_PLLVDD12_MASK			(0x3 << 25)



#define UTMI_PLL_CLK_BLK_EN_SHIFT               24

#define CLK_BLK_EN                              (0x1 << 24)

#define PLL_READY                               (0x1 << 23)

#define KVCO_EXT                                (0x1 << 22)

#define VCOCAL_START                            (0x1 << 21)



#define UTMI_PLL_KVCO_SHIFT			15

#define UTMI_PLL_KVCO_MASK                      (0x7 << 15)



#define UTMI_PLL_ICP_SHIFT			12

#define UTMI_PLL_ICP_MASK                       (0x7 << 12)



#define UTMI_PLL_FBDIV_SHIFT                    4

#define UTMI_PLL_FBDIV_MASK                     (0xFF << 4)



#define UTMI_PLL_REFDIV_SHIFT                   0

#define UTMI_PLL_REFDIV_MASK                    (0xF << 0)



/* For UTMI_TX Register */

#define UTMI_TX_REG_EXT_FS_RCAL_SHIFT		27

#define UTMI_TX_REG_EXT_FS_RCAL_MASK		(0xf << 27)



#define UTMI_TX_REG_EXT_FS_RCAL_EN_SHIFT	26

#define UTMI_TX_REG_EXT_FS_RCAL_EN_MASK		(0x1 << 26)



#define UTMI_TX_TXVDD12_SHIFT                   22

#define UTMI_TX_TXVDD12_MASK                    (0x3 << 22)



#define UTMI_TX_CK60_PHSEL_SHIFT                17

#define UTMI_TX_CK60_PHSEL_MASK                 (0xf << 17)



#define UTMI_TX_IMPCAL_VTH_SHIFT                14

#define UTMI_TX_IMPCAL_VTH_MASK                 (0x7 << 14)



#define REG_RCAL_START                          (0x1 << 12)



#define UTMI_TX_LOW_VDD_EN_SHIFT                11



#define UTMI_TX_AMP_SHIFT			0

#define UTMI_TX_AMP_MASK			(0x7 << 0)



/* For UTMI_RX Register */

#define UTMI_REG_SQ_LENGTH_SHIFT                15

#define UTMI_REG_SQ_LENGTH_MASK                 (0x3 << 15)



#define UTMI_RX_SQ_THRESH_SHIFT                 4

#define UTMI_RX_SQ_THRESH_MASK                  (0xf << 4)



#define UTMI_OTG_ADDON_OTG_ON			(1 << 0)



enum pxa_usb_phy_version {

	PXA_USB_PHY_MMP2,

	PXA_USB_PHY_PXA910,

	PXA_USB_PHY_PXA168,

};



struct pxa_usb_phy {

	struct phy *phy;

	void __iomem *base;

	enum pxa_usb_phy_version version;

};



/*****************************************************************************

 * The registers read/write routines

 *****************************************************************************/



static unsigned int u2o_get(void __iomem *base, unsigned int offset)

{

	return readl_relaxed(base + offset);

}



static void u2o_set(void __iomem *base, unsigned int offset,

		unsigned int value)

{

	u32 reg;



	reg = readl_relaxed(base + offset);

	reg |= value;

	writel_relaxed(reg, base + offset);

	readl_relaxed(base + offset);

}



static void u2o_clear(void __iomem *base, unsigned int offset,

		unsigned int value)

{

	u32 reg;



	reg = readl_relaxed(base + offset);

	reg &= ~value;

	writel_relaxed(reg, base + offset);

	readl_relaxed(base + offset);

}



static void u2o_write(void __iomem *base, unsigned int offset,

		unsigned int value)

{

	writel_relaxed(value, base + offset);

	readl_relaxed(base + offset);

}



static int pxa_usb_phy_init(struct phy *phy)

{

	struct pxa_usb_phy *pxa_usb_phy = phy_get_drvdata(phy);

	void __iomem *base = pxa_usb_phy->base;

	int loops;



	dev_info(&phy->dev, "initializing Marvell PXA USB PHY");



	/* Initialize the USB PHY power */

	if (pxa_usb_phy->version == PXA_USB_PHY_PXA910) {

		u2o_set(base, UTMI_CTRL, (1<<UTMI_CTRL_INPKT_DELAY_SOF_SHIFT)

			| (1<<UTMI_CTRL_PU_REF_SHIFT));

	}



	u2o_set(base, UTMI_CTRL, 1<<UTMI_CTRL_PLL_PWR_UP_SHIFT);

	u2o_set(base, UTMI_CTRL, 1<<UTMI_CTRL_PWR_UP_SHIFT);



	/* UTMI_PLL settings */

	u2o_clear(base, UTMI_PLL, UTMI_PLL_PLLVDD18_MASK

		| UTMI_PLL_PLLVDD12_MASK | UTMI_PLL_PLLCALI12_MASK

		| UTMI_PLL_FBDIV_MASK | UTMI_PLL_REFDIV_MASK

		| UTMI_PLL_ICP_MASK | UTMI_PLL_KVCO_MASK);



	u2o_set(base, UTMI_PLL, 0xee<<UTMI_PLL_FBDIV_SHIFT

		| 0xb<<UTMI_PLL_REFDIV_SHIFT | 3<<UTMI_PLL_PLLVDD18_SHIFT

		| 3<<UTMI_PLL_PLLVDD12_SHIFT | 3<<UTMI_PLL_PLLCALI12_SHIFT

		| 1<<UTMI_PLL_ICP_SHIFT | 3<<UTMI_PLL_KVCO_SHIFT);



	/* UTMI_TX */

	u2o_clear(base, UTMI_TX, UTMI_TX_REG_EXT_FS_RCAL_EN_MASK

		| UTMI_TX_TXVDD12_MASK | UTMI_TX_CK60_PHSEL_MASK

		| UTMI_TX_IMPCAL_VTH_MASK | UTMI_TX_REG_EXT_FS_RCAL_MASK

		| UTMI_TX_AMP_MASK);

	u2o_set(base, UTMI_TX, 3<<UTMI_TX_TXVDD12_SHIFT

		| 4<<UTMI_TX_CK60_PHSEL_SHIFT | 4<<UTMI_TX_IMPCAL_VTH_SHIFT

		| 8<<UTMI_TX_REG_EXT_FS_RCAL_SHIFT | 3<<UTMI_TX_AMP_SHIFT);



	/* UTMI_RX */

	u2o_clear(base, UTMI_RX, UTMI_RX_SQ_THRESH_MASK

		| UTMI_REG_SQ_LENGTH_MASK);

	u2o_set(base, UTMI_RX, 7<<UTMI_RX_SQ_THRESH_SHIFT

		| 2<<UTMI_REG_SQ_LENGTH_SHIFT);



	/* UTMI_IVREF */

	if (pxa_usb_phy->version == PXA_USB_PHY_PXA168) {

		/*

		 * fixing Microsoft Altair board interface with NEC hub issue -

		 * Set UTMI_IVREF from 0x4a3 to 0x4bf

		 */

		u2o_write(base, UTMI_IVREF, 0x4bf);

	}



	/* toggle VCOCAL_START bit of UTMI_PLL */

	udelay(200);

	u2o_set(base, UTMI_PLL, VCOCAL_START);

	udelay(40);

	u2o_clear(base, UTMI_PLL, VCOCAL_START);



	/* toggle REG_RCAL_START bit of UTMI_TX */

	udelay(400);

	u2o_set(base, UTMI_TX, REG_RCAL_START);

	udelay(40);

	u2o_clear(base, UTMI_TX, REG_RCAL_START);

	udelay(400);



	/* Make sure PHY PLL is ready */

	loops = 0;

	while ((u2o_get(base, UTMI_PLL) & PLL_READY) == 0) {

		mdelay(1);

		loops++;

		if (loops > 100) {

			dev_warn(&phy->dev, "calibrate timeout, UTMI_PLL %x\n",

						u2o_get(base, UTMI_PLL));

			break;

		}

	}



	if (pxa_usb_phy->version == PXA_USB_PHY_PXA168) {

		u2o_set(base, UTMI_RESERVE, 1 << 5);

		/* Turn on UTMI PHY OTG extension */

		u2o_write(base, UTMI_OTG_ADDON, 1);

	}



	return 0;



}



static int pxa_usb_phy_exit(struct phy *phy)

{

	struct pxa_usb_phy *pxa_usb_phy = phy_get_drvdata(phy);

	void __iomem *base = pxa_usb_phy->base;



	dev_info(&phy->dev, "deinitializing Marvell PXA USB PHY");



	if (pxa_usb_phy->version == PXA_USB_PHY_PXA168)

		u2o_clear(base, UTMI_OTG_ADDON, UTMI_OTG_ADDON_OTG_ON);



	u2o_clear(base, UTMI_CTRL, UTMI_CTRL_RXBUF_PDWN);

	u2o_clear(base, UTMI_CTRL, UTMI_CTRL_TXBUF_PDWN);

	u2o_clear(base, UTMI_CTRL, UTMI_CTRL_USB_CLK_EN);

	u2o_clear(base, UTMI_CTRL, 1<<UTMI_CTRL_PWR_UP_SHIFT);

	u2o_clear(base, UTMI_CTRL, 1<<UTMI_CTRL_PLL_PWR_UP_SHIFT);



	return 0;

}



static const struct phy_ops pxa_usb_phy_ops = {

	.init	= pxa_usb_phy_init,

	.exit	= pxa_usb_phy_exit,

	.owner	= THIS_MODULE,

};



static const struct of_device_id pxa_usb_phy_of_match[] = {

	{

		.compatible = "marvell,mmp2-usb-phy",

		.data = (void *)PXA_USB_PHY_MMP2,

	}, {

		.compatible = "marvell,pxa910-usb-phy",

		.data = (void *)PXA_USB_PHY_PXA910,

	}, {

		.compatible = "marvell,pxa168-usb-phy",

		.data = (void *)PXA_USB_PHY_PXA168,

	},

	{ },

};

MODULE_DEVICE_TABLE(of, pxa_usb_phy_of_match);



static int pxa_usb_phy_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct resource *resource;

	struct pxa_usb_phy *pxa_usb_phy;

	struct phy_provider *provider;

	const struct of_device_id *of_id;



	pxa_usb_phy = devm_kzalloc(dev, sizeof(struct pxa_usb_phy), GFP_KERNEL);

	if (!pxa_usb_phy)

		return -ENOMEM;



	of_id = of_match_node(pxa_usb_phy_of_match, dev->of_node);

	if (of_id)

		pxa_usb_phy->version = (enum pxa_usb_phy_version)of_id->data;

	else

		pxa_usb_phy->version = PXA_USB_PHY_MMP2;



	resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	pxa_usb_phy->base = devm_ioremap_resource(dev, resource);

	if (IS_ERR(pxa_usb_phy->base)) {

		dev_err(dev, "failed to remap PHY regs\n");

		return PTR_ERR(pxa_usb_phy->base);

	}



	pxa_usb_phy->phy = devm_phy_create(dev, NULL, &pxa_usb_phy_ops);

	if (IS_ERR(pxa_usb_phy->phy)) {

		dev_err(dev, "failed to create PHY\n");

		return PTR_ERR(pxa_usb_phy->phy);

	}



	phy_set_drvdata(pxa_usb_phy->phy, pxa_usb_phy);

	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);

	if (IS_ERR(provider)) {

		dev_err(dev, "failed to register PHY provider\n");

		return PTR_ERR(provider);

	}



	if (!dev->of_node) {

		phy_create_lookup(pxa_usb_phy->phy, "usb", "mv-udc");

		phy_create_lookup(pxa_usb_phy->phy, "usb", "pxa-u2oehci");

		phy_create_lookup(pxa_usb_phy->phy, "usb", "mv-otg");

	}



	dev_info(dev, "Marvell PXA USB PHY");

	return 0;

}



static struct platform_driver pxa_usb_phy_driver = {

	.probe		= pxa_usb_phy_probe,

	.driver		= {

		.name	= "pxa-usb-phy",

		.of_match_table = pxa_usb_phy_of_match,

	},

};

module_platform_driver(pxa_usb_phy_driver);



MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");

MODULE_DESCRIPTION("Marvell PXA USB PHY Driver");

MODULE_LICENSE("GPL v2");