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usb: otg: add basic mxs phy driver support
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>
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Richard Zhao
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Jul 9, 2012
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* Freescale MXS USB Phy Device | ||
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Required properties: | ||
- compatible: Should be "fsl,imx23-usbphy" | ||
- reg: Should contain registers location and length | ||
- interrupts: Should contain phy interrupt | ||
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Example: | ||
usbphy1: usbphy@020c9000 { | ||
compatible = "fsl,imx6q-usbphy", "fsl,imx23-usbphy"; | ||
reg = <0x020c9000 0x1000>; | ||
interrupts = <0 44 0x04>; | ||
}; |
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/* | ||
* 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 | ||
*/ | ||
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#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> | ||
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#define DRIVER_NAME "mxs_phy" | ||
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#define HW_USBPHY_PWD 0x00 | ||
#define HW_USBPHY_CTRL 0x30 | ||
#define HW_USBPHY_CTRL_SET 0x34 | ||
#define HW_USBPHY_CTRL_CLR 0x38 | ||
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#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) | ||
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struct mxs_phy { | ||
struct usb_phy phy; | ||
struct clk *clk; | ||
}; | ||
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#define to_mxs_phy(p) container_of((p), struct mxs_phy, phy) | ||
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static void mxs_phy_hw_init(struct mxs_phy *mxs_phy) | ||
{ | ||
void __iomem *base = mxs_phy->phy.io_priv; | ||
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stmp_reset_block(base + HW_USBPHY_CTRL); | ||
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/* Power up the PHY */ | ||
writel_relaxed(0, base + HW_USBPHY_PWD); | ||
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/* enable FS/LS device */ | ||
writel_relaxed(BM_USBPHY_CTRL_ENUTMILEVEL2 | | ||
BM_USBPHY_CTRL_ENUTMILEVEL3, | ||
base + HW_USBPHY_CTRL_SET); | ||
} | ||
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static int mxs_phy_init(struct usb_phy *phy) | ||
{ | ||
struct mxs_phy *mxs_phy = to_mxs_phy(phy); | ||
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clk_prepare_enable(mxs_phy->clk); | ||
mxs_phy_hw_init(mxs_phy); | ||
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return 0; | ||
} | ||
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static void mxs_phy_shutdown(struct usb_phy *phy) | ||
{ | ||
struct mxs_phy *mxs_phy = to_mxs_phy(phy); | ||
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writel_relaxed(BM_USBPHY_CTRL_CLKGATE, | ||
phy->io_priv + HW_USBPHY_CTRL_SET); | ||
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clk_disable_unprepare(mxs_phy->clk); | ||
} | ||
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static int mxs_phy_on_connect(struct usb_phy *phy, int port) | ||
{ | ||
dev_dbg(phy->dev, "Connect on port %d\n", port); | ||
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mxs_phy_hw_init(to_mxs_phy(phy)); | ||
writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, | ||
phy->io_priv + HW_USBPHY_CTRL_SET); | ||
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return 0; | ||
} | ||
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static int mxs_phy_on_disconnect(struct usb_phy *phy, int port) | ||
{ | ||
dev_dbg(phy->dev, "Disconnect on port %d\n", port); | ||
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writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, | ||
phy->io_priv + HW_USBPHY_CTRL_CLR); | ||
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return 0; | ||
} | ||
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static int mxs_phy_probe(struct platform_device *pdev) | ||
{ | ||
struct resource *res; | ||
void __iomem *base; | ||
struct clk *clk; | ||
struct mxs_phy *mxs_phy; | ||
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | ||
if (!res) { | ||
dev_err(&pdev->dev, "can't get device resources\n"); | ||
return -ENOENT; | ||
} | ||
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base = devm_request_and_ioremap(&pdev->dev, res); | ||
if (!base) | ||
return -EBUSY; | ||
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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); | ||
} | ||
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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; | ||
} | ||
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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; | ||
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ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier); | ||
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mxs_phy->clk = clk; | ||
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platform_set_drvdata(pdev, &mxs_phy->phy); | ||
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return 0; | ||
} | ||
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static int __devexit mxs_phy_remove(struct platform_device *pdev) | ||
{ | ||
platform_set_drvdata(pdev, NULL); | ||
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return 0; | ||
} | ||
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static const struct of_device_id mxs_phy_dt_ids[] = { | ||
{ .compatible = "fsl,imx23-usbphy", }, | ||
{ /* sentinel */ } | ||
}; | ||
MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids); | ||
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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, | ||
}, | ||
}; | ||
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static int __init mxs_phy_module_init(void) | ||
{ | ||
return platform_driver_register(&mxs_phy_driver); | ||
} | ||
postcore_initcall(mxs_phy_module_init); | ||
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static void __exit mxs_phy_module_exit(void) | ||
{ | ||
platform_driver_unregister(&mxs_phy_driver); | ||
} | ||
module_exit(mxs_phy_module_exit); | ||
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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"); |