Commit 01658f0f authored by Kishon Vijay Abraham I's avatar Kishon Vijay Abraham I Committed by Felipe Balbi
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usb: phy: add a new driver for usb part of control module 



Added a new driver for the usb part of control module. This has an API
to power on the USB2 phy and an API to write to the mailbox depending on
whether MUSB has to act in host mode or in device mode.

Writing to control module registers for doing the above task which was
previously done in omap glue and in omap-usb2 phy will be removed.

Signed-off-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 5d3c28b5

Documentation/devicetree/bindings/usb/omap-usb.txt

+29 −1
Original line number Diff line number Diff line 
OMAP GLUE

OMAP GLUE AND OTHER OMAP SPECIFIC COMPONENTS



OMAP MUSB GLUE

 - compatible : Should be "ti,omap4-musb" or "ti,omap3-musb"
@@ -16,6 +16,10 @@ OMAP MUSB GLUE 
 - power : Should be "50". This signifies the controller can supply upto

   100mA when operating in host mode.



Optional properties:

 - ctrl-module : phandle of the control module this glue uses to write to

   mailbox



SOC specific device node entry

usb_otg_hs: usb_otg_hs@4a0ab000 {

	compatible = "ti,omap4-musb";
@@ -23,6 +27,7 @@ usb_otg_hs: usb_otg_hs@4a0ab000 { 
	multipoint = <1>;

	num_eps = <16>;

	ram_bits = <12>;

	ctrl-module = <&omap_control_usb>;

};



Board specific device node entry
@@ -31,3 +36,26 @@ Board specific device node entry 
	mode = <3>;

	power = <50>;

};



OMAP CONTROL USB



Required properties:

 - compatible: Should be "ti,omap-control-usb"

 - reg : Address and length of the register set for the device. It contains

   the address of "control_dev_conf" and "otghs_control" or "phy_power_usb"

   depending upon omap4 or omap5.

 - reg-names: The names of the register addresses corresponding to the registers

   filled in "reg".

 - ti,type: This is used to differentiate whether the control module has

   usb mailbox or usb3 phy power. omap4 has usb mailbox in control module to

   notify events to the musb core and omap5 has usb3 phy power register to

   power on usb3 phy. Should be "1" if it has mailbox and "2" if it has usb3

   phy power.



omap_control_usb: omap-control-usb@4a002300 {

	compatible = "ti,omap-control-usb";

	reg = <0x4a002300 0x4>,

	      <0x4a00233c 0x4>;

	reg-names = "control_dev_conf", "otghs_control";

	ti,type = <1>;

};

Documentation/devicetree/bindings/usb/usb-phy.txt

+5 −0
Original line number Diff line number Diff line
@@ -8,10 +8,15 @@ Required properties: 
add the address of control module dev conf register until a driver for

control module is added



Optional properties:

 - ctrl-module : phandle of the control module used by PHY driver to power on

   the PHY.



This is usually a subnode of ocp2scp to which it is connected.



usb2phy@4a0ad080 {

	compatible = "ti,omap-usb2";

	reg = <0x4a0ad080 0x58>,

	      <0x4a002300 0x4>;

	ctrl-module = <&omap_control_usb>;

};

drivers/usb/phy/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -14,6 +14,16 @@ config OMAP_USB2 
	  The USB OTG controller communicates with the comparator using this

	  driver.



config OMAP_CONTROL_USB

	tristate "OMAP CONTROL USB Driver"

	depends on ARCH_OMAP2PLUS

	help

	  Enable this to add support for the USB part present in the control

	  module. This driver has API to power on the USB2 PHY and to write to

	  the mailbox. The mailbox is present only in omap4 and the register to

	  power on the USB2 PHY is present in OMAP4 and OMAP5. OMAP5 has an

	  additional register to power on USB3 PHY.



config USB_ISP1301

	tristate "NXP ISP1301 USB transceiver support"

	depends on USB || USB_GADGET

drivers/usb/phy/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
ccflags-$(CONFIG_USB_DEBUG) := -DDEBUG



obj-$(CONFIG_OMAP_USB2)			+= omap-usb2.o

obj-$(CONFIG_OMAP_CONTROL_USB)		+= omap-control-usb.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

drivers/usb/phy/omap-control-usb.c

0 → 100644
+295 −0
Original line number Diff line number Diff line 
/*

 * omap-control-usb.c - The USB part of control module.

 *

 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com

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

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * Author: Kishon Vijay Abraham I <kishon@ti.com>

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */



#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/of.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/clk.h>

#include <linux/usb/omap_control_usb.h>



static struct omap_control_usb *control_usb;



/**

 * omap_get_control_dev - returns the device pointer for this control device

 *

 * This API should be called to get the device pointer for this control

 * module device. This device pointer should be used for called other

 * exported API's in this driver.

 *

 * To be used by PHY driver and glue driver.

 */

struct device *omap_get_control_dev(void)

{

	if (!control_usb)

		return ERR_PTR(-ENODEV);



	return control_usb->dev;

}

EXPORT_SYMBOL_GPL(omap_get_control_dev);



/**

 * omap_control_usb3_phy_power - power on/off the serializer using control

 *	module

 * @dev: the control module device

 * @on: 0 to off and 1 to on based on powering on or off the PHY

 *

 * usb3 PHY driver should call this API to power on or off the PHY.

 */

void omap_control_usb3_phy_power(struct device *dev, bool on)

{

	u32 val;

	unsigned long rate;

	struct omap_control_usb	*control_usb = dev_get_drvdata(dev);



	if (control_usb->type != OMAP_CTRL_DEV_TYPE2)

		return;



	rate = clk_get_rate(control_usb->sys_clk);

	rate = rate/1000000;



	val = readl(control_usb->phy_power);



	if (on) {

		val &= ~(OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK |

			OMAP_CTRL_USB_PWRCTL_CLK_FREQ_MASK);

		val |= OMAP_CTRL_USB3_PHY_TX_RX_POWERON <<

			OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;

		val |= rate << OMAP_CTRL_USB_PWRCTL_CLK_FREQ_SHIFT;

	} else {

		val &= ~OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK;

		val |= OMAP_CTRL_USB3_PHY_TX_RX_POWEROFF <<

			OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;

	}



	writel(val, control_usb->phy_power);

}

EXPORT_SYMBOL_GPL(omap_control_usb3_phy_power);



/**

 * omap_control_usb_phy_power - power on/off the phy using control module reg

 * @dev: the control module device

 * @on: 0 or 1, based on powering on or off the PHY

 */

void omap_control_usb_phy_power(struct device *dev, int on)

{

	u32 val;

	struct omap_control_usb	*control_usb = dev_get_drvdata(dev);



	val = readl(control_usb->dev_conf);



	if (on)

		val &= ~OMAP_CTRL_DEV_PHY_PD;

	else

		val |= OMAP_CTRL_DEV_PHY_PD;



	writel(val, control_usb->dev_conf);

}

EXPORT_SYMBOL_GPL(omap_control_usb_phy_power);



/**

 * omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded

 * @ctrl_usb: struct omap_control_usb *

 *

 * Writes to the mailbox register to notify the usb core that a usb

 * device has been connected.

 */

static void omap_control_usb_host_mode(struct omap_control_usb *ctrl_usb)

{

	u32 val;



	val = readl(ctrl_usb->otghs_control);

	val &= ~(OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND);

	val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID;

	writel(val, ctrl_usb->otghs_control);

}



/**

 * omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high

 * impedance

 * @ctrl_usb: struct omap_control_usb *

 *

 * Writes to the mailbox register to notify the usb core that it has been

 * connected to a usb host.

 */

static void omap_control_usb_device_mode(struct omap_control_usb *ctrl_usb)

{

	u32 val;



	val = readl(ctrl_usb->otghs_control);

	val &= ~OMAP_CTRL_DEV_SESSEND;

	val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_AVALID |

		OMAP_CTRL_DEV_VBUSVALID;

	writel(val, ctrl_usb->otghs_control);

}



/**

 * omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high

 * impedance

 * @ctrl_usb: struct omap_control_usb *

 *

 * Writes to the mailbox register to notify the usb core it's now in

 * disconnected state.

 */

static void omap_control_usb_set_sessionend(struct omap_control_usb *ctrl_usb)

{

	u32 val;



	val = readl(ctrl_usb->otghs_control);

	val &= ~(OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID);

	val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND;

	writel(val, ctrl_usb->otghs_control);

}



/**

 * omap_control_usb_set_mode - Calls to functions to set USB in one of host mode

 * or device mode or to denote disconnected state

 * @dev: the control module device

 * @mode: The mode to which usb should be configured

 *

 * This is an API to write to the mailbox register to notify the usb core that

 * a usb device has been connected.

 */

void omap_control_usb_set_mode(struct device *dev,

	enum omap_control_usb_mode mode)

{

	struct omap_control_usb	*ctrl_usb;



	if (IS_ERR(dev) || control_usb->type != OMAP_CTRL_DEV_TYPE1)

		return;



	ctrl_usb = dev_get_drvdata(dev);



	switch (mode) {

	case USB_MODE_HOST:

		omap_control_usb_host_mode(ctrl_usb);

		break;

	case USB_MODE_DEVICE:

		omap_control_usb_device_mode(ctrl_usb);

		break;

	case USB_MODE_DISCONNECT:

		omap_control_usb_set_sessionend(ctrl_usb);

		break;

	default:

		dev_vdbg(dev, "invalid omap control usb mode\n");

	}

}

EXPORT_SYMBOL_GPL(omap_control_usb_set_mode);



static int omap_control_usb_probe(struct platform_device *pdev)

{

	struct resource	*res;

	struct device_node *np = pdev->dev.of_node;

	struct omap_control_usb_platform_data *pdata = pdev->dev.platform_data;



	control_usb = devm_kzalloc(&pdev->dev, sizeof(*control_usb),

		GFP_KERNEL);

	if (!control_usb) {

		dev_err(&pdev->dev, "unable to alloc memory for control usb\n");

		return -ENOMEM;

	}



	if (np) {

		of_property_read_u32(np, "ti,type", &control_usb->type);

	} else if (pdata) {

		control_usb->type = pdata->type;

	} else {

		dev_err(&pdev->dev, "no pdata present\n");

		return -EINVAL;

	}



	control_usb->dev	= &pdev->dev;



	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,

		"control_dev_conf");

	control_usb->dev_conf = devm_request_and_ioremap(&pdev->dev, res);

	if (!control_usb->dev_conf) {

		dev_err(&pdev->dev, "Failed to obtain io memory\n");

		return -EADDRNOTAVAIL;

	}



	if (control_usb->type == OMAP_CTRL_DEV_TYPE1) {

		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,

			"otghs_control");

		control_usb->otghs_control = devm_request_and_ioremap(

			&pdev->dev, res);

		if (!control_usb->otghs_control) {

			dev_err(&pdev->dev, "Failed to obtain io memory\n");

			return -EADDRNOTAVAIL;

		}

	}



	if (control_usb->type == OMAP_CTRL_DEV_TYPE2) {

		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,

			"phy_power_usb");

		control_usb->phy_power = devm_request_and_ioremap(

			&pdev->dev, res);

		if (!control_usb->phy_power) {

			dev_dbg(&pdev->dev, "Failed to obtain io memory\n");

			return -EADDRNOTAVAIL;

		}



		control_usb->sys_clk = devm_clk_get(control_usb->dev,

			"sys_clkin");

		if (IS_ERR(control_usb->sys_clk)) {

			pr_err("%s: unable to get sys_clkin\n", __func__);

			return -EINVAL;

		}

	}





	dev_set_drvdata(control_usb->dev, control_usb);



	return 0;

}



#ifdef CONFIG_OF

static const struct of_device_id omap_control_usb_id_table[] = {

	{ .compatible = "ti,omap-control-usb" },

	{}

};

MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);

#endif



static struct platform_driver omap_control_usb_driver = {

	.probe		= omap_control_usb_probe,

	.driver		= {

		.name	= "omap-control-usb",

		.owner	= THIS_MODULE,

		.of_match_table = of_match_ptr(omap_control_usb_id_table),

	},

};



static int __init omap_control_usb_init(void)

{

	return platform_driver_register(&omap_control_usb_driver);

}

subsys_initcall(omap_control_usb_init);



static void __exit omap_control_usb_exit(void)

{

	platform_driver_unregister(&omap_control_usb_driver);

}

module_exit(omap_control_usb_exit);



MODULE_ALIAS("platform: omap_control_usb");

MODULE_AUTHOR("Texas Instruments Inc.");

MODULE_DESCRIPTION("OMAP Control Module USB Driver");

MODULE_LICENSE("GPL v2");

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