Skip to content

Commit

Permalink
usb: otg: add basic mxs phy driver support
Browse files Browse the repository at this point in the history
mxs phy is used in Freescale i.MX SoCs, for example
imx23, imx28, imx6Q. This patch adds the basic host
support.

Signed-off-by: Richard Zhao <richard.zhao@freescale.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Peter Chen <peter.chen@freescale.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Tested-by: Subodh Nijsure <snijsure@grid-net.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  • Loading branch information
Richard Zhao authored and Greg Kroah-Hartman committed Jul 9, 2012
1 parent a2c3d69 commit b3d9968
Show file tree
Hide file tree
Showing 4 changed files with 210 additions and 0 deletions.
13 changes: 13 additions & 0 deletions Documentation/devicetree/bindings/usb/mxs-phy.txt
Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
* Freescale MXS USB Phy Device

Required properties:
- compatible: Should be "fsl,imx23-usbphy"
- reg: Should contain registers location and length
- interrupts: Should contain phy interrupt

Example:
usbphy1: usbphy@020c9000 {
compatible = "fsl,imx6q-usbphy", "fsl,imx23-usbphy";
reg = <0x020c9000 0x1000>;
interrupts = <0 44 0x04>;
};
10 changes: 10 additions & 0 deletions drivers/usb/otg/Kconfig
Original file line number Diff line number Diff line change
Expand Up @@ -116,6 +116,16 @@ config FSL_USB2_OTG
help
Enable this to support Freescale USB OTG transceiver.

config USB_MXS_PHY
tristate "Freescale MXS USB PHY support"
depends on ARCH_MXC || ARCH_MXS
select STMP_DEVICE
select USB_OTG_UTILS
help
Enable this to support the Freescale MXS USB PHY.

MXS Phy is used by some of the i.MX SoCs, for example imx23/28/6x.

config USB_MV_OTG
tristate "Marvell USB OTG support"
depends on USB_EHCI_MV && USB_MV_UDC && USB_SUSPEND
Expand Down
1 change: 1 addition & 0 deletions drivers/usb/otg/Makefile
Original file line number Diff line number Diff line change
Expand Up @@ -20,4 +20,5 @@ obj-$(CONFIG_USB_MSM_OTG) += msm_otg.o
obj-$(CONFIG_AB8500_USB) += ab8500-usb.o
fsl_usb2_otg-objs := fsl_otg.o otg_fsm.o
obj-$(CONFIG_FSL_USB2_OTG) += fsl_usb2_otg.o
obj-$(CONFIG_USB_MXS_PHY) += mxs-phy.o
obj-$(CONFIG_USB_MV_OTG) += mv_otg.o
186 changes: 186 additions & 0 deletions drivers/usb/otg/mxs-phy.c
Original file line number Diff line number Diff line change
@@ -0,0 +1,186 @@
/*
* Copyright 2012 Freescale Semiconductor, Inc.
* Copyright (C) 2012 Marek Vasut <marex@denx.de>
* on behalf of DENX Software Engineering GmbH
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/usb/otg.h>
#include <linux/stmp_device.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>

#define DRIVER_NAME "mxs_phy"

#define HW_USBPHY_PWD 0x00
#define HW_USBPHY_CTRL 0x30
#define HW_USBPHY_CTRL_SET 0x34
#define HW_USBPHY_CTRL_CLR 0x38

#define BM_USBPHY_CTRL_SFTRST BIT(31)
#define BM_USBPHY_CTRL_CLKGATE BIT(30)
#define BM_USBPHY_CTRL_ENUTMILEVEL3 BIT(15)
#define BM_USBPHY_CTRL_ENUTMILEVEL2 BIT(14)
#define BM_USBPHY_CTRL_ENHOSTDISCONDETECT BIT(1)

struct mxs_phy {
struct usb_phy phy;
struct clk *clk;
};

#define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)

static void mxs_phy_hw_init(struct mxs_phy *mxs_phy)
{
void __iomem *base = mxs_phy->phy.io_priv;

stmp_reset_block(base + HW_USBPHY_CTRL);

/* Power up the PHY */
writel_relaxed(0, base + HW_USBPHY_PWD);

/* enable FS/LS device */
writel_relaxed(BM_USBPHY_CTRL_ENUTMILEVEL2 |
BM_USBPHY_CTRL_ENUTMILEVEL3,
base + HW_USBPHY_CTRL_SET);
}

static int mxs_phy_init(struct usb_phy *phy)
{
struct mxs_phy *mxs_phy = to_mxs_phy(phy);

clk_prepare_enable(mxs_phy->clk);
mxs_phy_hw_init(mxs_phy);

return 0;
}

static void mxs_phy_shutdown(struct usb_phy *phy)
{
struct mxs_phy *mxs_phy = to_mxs_phy(phy);

writel_relaxed(BM_USBPHY_CTRL_CLKGATE,
phy->io_priv + HW_USBPHY_CTRL_SET);

clk_disable_unprepare(mxs_phy->clk);
}

static int mxs_phy_on_connect(struct usb_phy *phy, int port)
{
dev_dbg(phy->dev, "Connect on port %d\n", port);

mxs_phy_hw_init(to_mxs_phy(phy));
writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
phy->io_priv + HW_USBPHY_CTRL_SET);

return 0;
}

static int mxs_phy_on_disconnect(struct usb_phy *phy, int port)
{
dev_dbg(phy->dev, "Disconnect on port %d\n", port);

writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
phy->io_priv + HW_USBPHY_CTRL_CLR);

return 0;
}

static int mxs_phy_probe(struct platform_device *pdev)
{
struct resource *res;
void __iomem *base;
struct clk *clk;
struct mxs_phy *mxs_phy;

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "can't get device resources\n");
return -ENOENT;
}

base = devm_request_and_ioremap(&pdev->dev, res);
if (!base)
return -EBUSY;

clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
dev_err(&pdev->dev,
"can't get the clock, err=%ld", PTR_ERR(clk));
return PTR_ERR(clk);
}

mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
if (!mxs_phy) {
dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n");
return -ENOMEM;
}

mxs_phy->phy.io_priv = base;
mxs_phy->phy.dev = &pdev->dev;
mxs_phy->phy.label = DRIVER_NAME;
mxs_phy->phy.init = mxs_phy_init;
mxs_phy->phy.shutdown = mxs_phy_shutdown;
mxs_phy->phy.notify_connect = mxs_phy_on_connect;
mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect;

ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier);

mxs_phy->clk = clk;

platform_set_drvdata(pdev, &mxs_phy->phy);

return 0;
}

static int __devexit mxs_phy_remove(struct platform_device *pdev)
{
platform_set_drvdata(pdev, NULL);

return 0;
}

static const struct of_device_id mxs_phy_dt_ids[] = {
{ .compatible = "fsl,imx23-usbphy", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);

static struct platform_driver mxs_phy_driver = {
.probe = mxs_phy_probe,
.remove = __devexit_p(mxs_phy_remove),
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
.of_match_table = mxs_phy_dt_ids,
},
};

static int __init mxs_phy_module_init(void)
{
return platform_driver_register(&mxs_phy_driver);
}
postcore_initcall(mxs_phy_module_init);

static void __exit mxs_phy_module_exit(void)
{
platform_driver_unregister(&mxs_phy_driver);
}
module_exit(mxs_phy_module_exit);

MODULE_ALIAS("platform:mxs-usb-phy");
MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
MODULE_LICENSE("GPL");

0 comments on commit b3d9968

Please sign in to comment.