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Commit a4aeb211 authored by Hans de Goede's avatar Hans de Goede Committed by Greg Kroah-Hartman
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ehci-platform: Add support for clks and phy passed through devicetree 



Currently ehci-platform is only used in combination with devicetree when used
with some Via socs. By extending it to (optionally) get clks and a phy from
devicetree, and enabling / disabling those on power_on / off, it can be used
more generically. Specifically after this commit it can be used for the
ehci controller on Allwinner sunxi SoCs.

Since ehci-platform is intended to handle any generic enough non pci ehci
device, add a "usb-ehci" compatibility string.

There already is a usb-ehci device-tree bindings document, update this
with clks and phy bindings info.

Although actually quite generic so far the via,vt8500 compatibilty string
had its own bindings document. Somehow we even ended up with 2 of them. Since
these provide no extra information over the generic usb-ehci documentation,
this patch removes them.

The ehci-ppc-of.c driver also claims the usb-ehci compatibility string,
even though it mostly is ibm,usb-ehci-440epx specific. ehci-platform.c is
not needed on ppc platforms, so add a !PPC_OF dependency to it to avoid
2 drivers claiming the same compatibility string getting build on ppc.

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ca52a17b

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

+18 −7
Original line number Diff line number Diff line
@@ -7,13 +7,14 @@ Required properties: 
    (debug-port or other) can be also specified here, but only after

    definition of standard EHCI registers.

  - interrupts : one EHCI interrupt should be described here.

If device registers are implemented in big endian mode, the device

node should have "big-endian-regs" property.

If controller implementation operates with big endian descriptors,

"big-endian-desc" property should be specified.

If both big endian registers and descriptors are used by the controller

implementation, "big-endian" property can be specified instead of having

both "big-endian-regs" and "big-endian-desc".



Optional properties:

 - big-endian-regs : boolean, set this for hcds with big-endian registers

 - big-endian-desc : boolean, set this for hcds with big-endian descriptors

 - big-endian : boolean, for hcds with big-endian-regs + big-endian-desc

 - clocks : a list of phandle + clock specifier pairs

 - phys : phandle + phy specifier pair

 - phy-names : "usb"



Example (Sequoia 440EPx):

    ehci@e0000300 {
@@ -23,3 +24,13 @@ Example (Sequoia 440EPx): 
	   reg = <0 e0000300 90 0 e0000390 70>;

	   big-endian;

   };



Example (Allwinner sun4i A10 SoC):

   ehci0: usb@01c14000 {

	   compatible = "allwinner,sun4i-a10-ehci", "usb-ehci";

	   reg = <0x01c14000 0x100>;

	   interrupts = <39>;

	   clocks = <&ahb_gates 1>;

	   phys = <&usbphy 1>;

	   phy-names = "usb";

   };

Documentation/devicetree/bindings/usb/via,vt8500-ehci.txt

deleted100644 → 0
+0 −15
Original line number Diff line number Diff line 
VIA/Wondermedia VT8500 EHCI Controller

-----------------------------------------------------



Required properties:

- compatible : "via,vt8500-ehci"

- reg : Should contain 1 register ranges(address and length)

- interrupts : ehci controller interrupt



Example:



	ehci@d8007900 {

		compatible = "via,vt8500-ehci";

		reg = <0xd8007900 0x200>;

		interrupts = <43>;

	};

Documentation/devicetree/bindings/usb/vt8500-ehci.txt

deleted100644 → 0
+0 −12
Original line number Diff line number Diff line 
VIA VT8500 and Wondermedia WM8xxx SoC USB controllers.



Required properties:

 - compatible: Should be "via,vt8500-ehci" or "wm,prizm-ehci".

 - reg: Address range of the ehci registers. size should be 0x200

 - interrupts: Should contain the ehci interrupt.



usb: ehci@D8007100 {

	compatible = "wm,prizm-ehci", "usb-ehci";

	reg = <0xD8007100 0x200>;

	interrupts = <1>;

};

drivers/usb/host/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -255,6 +255,7 @@ config USB_EHCI_ATH79 


config USB_EHCI_HCD_PLATFORM

	tristate "Generic EHCI driver for a platform device"

	depends on !PPC_OF

	default n

	---help---

	  Adds an EHCI host driver for a generic platform device, which

drivers/usb/host/ehci-platform.c

+123 −24
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 
 *

 * Copyright 2007 Steven Brown <sbrown@cortland.com>

 * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>

 * Copyright 2014 Hans de Goede <hdegoede@redhat.com>

 *

 * Derived from the ohci-ssb driver

 * Copyright 2007 Michael Buesch <m@bues.ch>
@@ -18,6 +19,7 @@ 
 *

 * Licensed under the GNU/GPL. See COPYING for details.

 */

#include <linux/clk.h>

#include <linux/dma-mapping.h>

#include <linux/err.h>

#include <linux/kernel.h>
@@ -25,6 +27,7 @@ 
#include <linux/io.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/phy/phy.h>

#include <linux/platform_device.h>

#include <linux/usb.h>

#include <linux/usb/hcd.h>
@@ -33,6 +36,13 @@ 
#include "ehci.h"



#define DRIVER_DESC "EHCI generic platform driver"

#define EHCI_MAX_CLKS 3

#define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)



struct ehci_platform_priv {

	struct clk *clks[EHCI_MAX_CLKS];

	struct phy *phy;

};



static const char hcd_name[] = "ehci-platform";
@@ -64,38 +74,90 @@ static int ehci_platform_reset(struct usb_hcd *hcd) 
	return 0;

}



static int ehci_platform_power_on(struct platform_device *dev)

{

	struct usb_hcd *hcd = platform_get_drvdata(dev);

	struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);

	int clk, ret;



	for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) {

		ret = clk_prepare_enable(priv->clks[clk]);

		if (ret)

			goto err_disable_clks;

	}



	if (priv->phy) {

		ret = phy_init(priv->phy);

		if (ret)

			goto err_disable_clks;



		ret = phy_power_on(priv->phy);

		if (ret)

			goto err_exit_phy;

	}



	return 0;



err_exit_phy:

	phy_exit(priv->phy);

err_disable_clks:

	while (--clk >= 0)

		clk_disable_unprepare(priv->clks[clk]);



	return ret;

}



static void ehci_platform_power_off(struct platform_device *dev)

{

	struct usb_hcd *hcd = platform_get_drvdata(dev);

	struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);

	int clk;



	if (priv->phy) {

		phy_power_off(priv->phy);

		phy_exit(priv->phy);

	}



	for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--)

		if (priv->clks[clk])

			clk_disable_unprepare(priv->clks[clk]);

}



static struct hc_driver __read_mostly ehci_platform_hc_driver;



static const struct ehci_driver_overrides platform_overrides __initconst = {

	.reset =		ehci_platform_reset,

	.extra_priv_size =	sizeof(struct ehci_platform_priv),

};



static struct usb_ehci_pdata ehci_platform_defaults;

static struct usb_ehci_pdata ehci_platform_defaults = {

	.power_on =		ehci_platform_power_on,

	.power_suspend =	ehci_platform_power_off,

	.power_off =		ehci_platform_power_off,

};



static int ehci_platform_probe(struct platform_device *dev)

{

	struct usb_hcd *hcd;

	struct resource *res_mem;

	struct usb_ehci_pdata *pdata;

	int irq;

	int err;

	struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);

	struct ehci_platform_priv *priv;

	int err, irq, clk = 0;



	if (usb_disabled())

		return -ENODEV;



	/*

	 * use reasonable defaults so platforms don't have to provide these.

	 * with DT probing on ARM, none of these are set.

	 * Use reasonable defaults so platforms don't have to provide these

	 * with DT probing on ARM.

	 */

	if (!dev_get_platdata(&dev->dev))

		dev->dev.platform_data = &ehci_platform_defaults;

	if (!pdata)

		pdata = &ehci_platform_defaults;



	err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));

	if (err)

		return err;



	pdata = dev_get_platdata(&dev->dev);



	irq = platform_get_irq(dev, 0);

	if (irq < 0) {

		dev_err(&dev->dev, "no irq provided");
@@ -107,17 +169,40 @@ static int ehci_platform_probe(struct platform_device *dev) 
		return -ENXIO;

	}



	hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,

			     dev_name(&dev->dev));

	if (!hcd)

		return -ENOMEM;



	platform_set_drvdata(dev, hcd);

	dev->dev.platform_data = pdata;

	priv = hcd_to_ehci_priv(hcd);



	if (pdata == &ehci_platform_defaults && dev->dev.of_node) {

		priv->phy = devm_phy_get(&dev->dev, "usb");

		if (IS_ERR(priv->phy)) {

			err = PTR_ERR(priv->phy);

			if (err == -EPROBE_DEFER)

				goto err_put_hcd;

			priv->phy = NULL;

		}



		for (clk = 0; clk < EHCI_MAX_CLKS; clk++) {

			priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);

			if (IS_ERR(priv->clks[clk])) {

				err = PTR_ERR(priv->clks[clk]);

				if (err == -EPROBE_DEFER)

					goto err_put_clks;

				priv->clks[clk] = NULL;

				break;

			}

		}

	}



	if (pdata->power_on) {

		err = pdata->power_on(dev);

		if (err < 0)

			return err;

	}



	hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,

			     dev_name(&dev->dev));

	if (!hcd) {

		err = -ENOMEM;

		goto err_power;

			goto err_put_clks;

	}



	hcd->rsrc_start = res_mem->start;
@@ -126,22 +211,28 @@ static int ehci_platform_probe(struct platform_device *dev) 
	hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);

	if (IS_ERR(hcd->regs)) {

		err = PTR_ERR(hcd->regs);

		goto err_put_hcd;

		goto err_power;

	}

	err = usb_add_hcd(hcd, irq, IRQF_SHARED);

	if (err)

		goto err_put_hcd;

		goto err_power;



	device_wakeup_enable(hcd->self.controller);

	platform_set_drvdata(dev, hcd);



	return err;



err_put_hcd:

	usb_put_hcd(hcd);

err_power:

	if (pdata->power_off)

		pdata->power_off(dev);

err_put_clks:

	while (--clk >= 0)

		clk_put(priv->clks[clk]);

err_put_hcd:

	if (pdata == &ehci_platform_defaults)

		dev->dev.platform_data = NULL;



	usb_put_hcd(hcd);



	return err;

}
@@ -150,13 +241,19 @@ static int ehci_platform_remove(struct platform_device *dev) 
{

	struct usb_hcd *hcd = platform_get_drvdata(dev);

	struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);

	struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);

	int clk;



	usb_remove_hcd(hcd);

	usb_put_hcd(hcd);



	if (pdata->power_off)

		pdata->power_off(dev);



	for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)

		clk_put(priv->clks[clk]);



	usb_put_hcd(hcd);



	if (pdata == &ehci_platform_defaults)

		dev->dev.platform_data = NULL;
@@ -207,8 +304,10 @@ static int ehci_platform_resume(struct device *dev) 
static const struct of_device_id vt8500_ehci_ids[] = {

	{ .compatible = "via,vt8500-ehci", },

	{ .compatible = "wm,prizm-ehci", },

	{ .compatible = "usb-ehci", },

	{}

};

MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);



static const struct platform_device_id ehci_platform_table[] = {

	{ "ehci-platform", 0 },