drivers/usb/host/ohci-nxp.c - kernel/msm-4.19 - Gitiles

 /*
  * driver for NXP USB Host devices
  *
  * Currently supported OHCI host devices:
  * - NXP LPC32xx
  *
  * Authors: Dmitry Chigirev <source@mvista.com>
  *	    Vitaly Wool <vitalywool@gmail.com>
  *
  * register initialization is based on code examples provided by Philips
  * Copyright (c) 2005 Koninklijke Philips Electronics N.V.
  *
  * NOTE: This driver does not have suspend/resume functionality
  * This driver is intended for engineering development purposes only
  *
  * 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
  * the terms of the GNU General Public License version 2. This program
  * is licensed "as is" without any warranty of any kind, whether express
  * or implied.
  */
 #include <linux/clk.h>
 #include <linux/platform_device.h>
 #include <linux/i2c.h>
 #include <linux/of.h>
 #include <linux/usb/isp1301.h>

 #include <mach/hardware.h>
 #include <asm/mach-types.h>
 #include <asm/io.h>

 #include <mach/platform.h>
 #include <mach/irqs.h>

 #define USB_CONFIG_BASE		0x31020000
 #define PWRMAN_BASE		0x40004000

 #define USB_CTRL		IO_ADDRESS(PWRMAN_BASE + 0x64)

 /* USB_CTRL bit defines */
 #define USB_SLAVE_HCLK_EN	(1 << 24)
 #define USB_DEV_NEED_CLK_EN	(1 << 22)
 #define USB_HOST_NEED_CLK_EN	(1 << 21)
 #define PAD_CONTROL_LAST_DRIVEN	(1 << 19)

 #define USB_OTG_STAT_CONTROL	IO_ADDRESS(USB_CONFIG_BASE + 0x110)

 /* USB_OTG_STAT_CONTROL bit defines */
 #define TRANSPARENT_I2C_EN	(1 << 7)
 #define HOST_EN			(1 << 0)

 /* On LPC32xx, those are undefined */
 #ifndef start_int_set_falling_edge
 #define start_int_set_falling_edge(irq)
 #define start_int_set_rising_edge(irq)
 #define start_int_ack(irq)
 #define start_int_mask(irq)
 #define start_int_umask(irq)
 #endif

 static struct i2c_client *isp1301_i2c_client;

 extern int usb_disabled(void);

 static struct clk *usb_pll_clk;
 static struct clk *usb_dev_clk;
 static struct clk *usb_otg_clk;

 static void isp1301_configure_lpc32xx(void)
 {
 	/* LPC32XX only supports DAT_SE0 USB mode */
 	/* This sequence is important */

 	/* Disable transparent UART mode first */
 	i2c_smbus_write_byte_data(isp1301_i2c_client,
 		(ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
 		MC1_UART_EN);
 	i2c_smbus_write_byte_data(isp1301_i2c_client,
 		(ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
 		~MC1_SPEED_REG);
 	i2c_smbus_write_byte_data(isp1301_i2c_client,
 				  ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
 	i2c_smbus_write_byte_data(isp1301_i2c_client,
 		  (ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR),
 		  ~0);
 	i2c_smbus_write_byte_data(isp1301_i2c_client,
 		ISP1301_I2C_MODE_CONTROL_2,
 		(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL));
 	i2c_smbus_write_byte_data(isp1301_i2c_client,
 		(ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR), ~0);
 	i2c_smbus_write_byte_data(isp1301_i2c_client,
 		ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
 	i2c_smbus_write_byte_data(isp1301_i2c_client,
 		ISP1301_I2C_OTG_CONTROL_1,
 		(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
 	i2c_smbus_write_byte_data(isp1301_i2c_client,
 		(ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
 		(OTG1_DM_PULLUP | OTG1_DP_PULLUP));
 	i2c_smbus_write_byte_data(isp1301_i2c_client,
 		ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
 	i2c_smbus_write_byte_data(isp1301_i2c_client,
 		ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR,
 		~0);
 	i2c_smbus_write_byte_data(isp1301_i2c_client,
 		ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR, ~0);

 	/* Enable usb_need_clk clock after transceiver is initialized */
 	__raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);

 	printk(KERN_INFO "ISP1301 Vendor ID  : 0x%04x\n",
 	      i2c_smbus_read_word_data(isp1301_i2c_client, 0x00));
 	printk(KERN_INFO "ISP1301 Product ID : 0x%04x\n",
 	      i2c_smbus_read_word_data(isp1301_i2c_client, 0x02));
 	printk(KERN_INFO "ISP1301 Version ID : 0x%04x\n",
 	      i2c_smbus_read_word_data(isp1301_i2c_client, 0x14));
 }

 static void isp1301_configure(void)
 {
 	isp1301_configure_lpc32xx();
 }

 static inline void isp1301_vbus_on(void)
 {
 	i2c_smbus_write_byte_data(isp1301_i2c_client, ISP1301_I2C_OTG_CONTROL_1,
 				  OTG1_VBUS_DRV);
 }

 static inline void isp1301_vbus_off(void)
 {
 	i2c_smbus_write_byte_data(isp1301_i2c_client,
 		ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR,
 		OTG1_VBUS_DRV);
 }

 static void nxp_start_hc(void)
 {
 	unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN;
 	__raw_writel(tmp, USB_OTG_STAT_CONTROL);
 	isp1301_vbus_on();
 }

 static void nxp_stop_hc(void)
 {
 	unsigned long tmp;
 	isp1301_vbus_off();
 	tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN;
 	__raw_writel(tmp, USB_OTG_STAT_CONTROL);
 }

 static int __devinit ohci_nxp_start(struct usb_hcd *hcd)
 {
 	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 	int ret;

 	if ((ret = ohci_init(ohci)) < 0)
 		return ret;

 	if ((ret = ohci_run(ohci)) < 0) {
 		dev_err(hcd->self.controller, "can't start\n");
 		ohci_stop(hcd);
 		return ret;
 	}
 	return 0;
 }

 static const struct hc_driver ohci_nxp_hc_driver = {
 	.description = hcd_name,
 	.product_desc =		"nxp OHCI",

 	/*
 	 * generic hardware linkage
 	 */
 	.irq = ohci_irq,
 	.flags = HCD_USB11 | HCD_MEMORY,

 	.hcd_priv_size =	sizeof(struct ohci_hcd),
 	/*
 	 * basic lifecycle operations
 	 */
 	.start = ohci_nxp_start,
 	.stop = ohci_stop,
 	.shutdown = ohci_shutdown,

 	/*
 	 * managing i/o requests and associated device resources
 	 */
 	.urb_enqueue = ohci_urb_enqueue,
 	.urb_dequeue = ohci_urb_dequeue,
 	.endpoint_disable = ohci_endpoint_disable,

 	/*
 	 * scheduling support
 	 */
 	.get_frame_number = ohci_get_frame,

 	/*
 	 * root hub support
 	 */
 	.hub_status_data = ohci_hub_status_data,
 	.hub_control = ohci_hub_control,
 #ifdef	CONFIG_PM
 	.bus_suspend = ohci_bus_suspend,
 	.bus_resume = ohci_bus_resume,
 #endif
 	.start_port_reset = ohci_start_port_reset,
 };

 static int __devinit usb_hcd_nxp_probe(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd = 0;
 	struct ohci_hcd *ohci;
 	const struct hc_driver *driver = &ohci_nxp_hc_driver;
 	struct resource *res;
 	int ret = 0, irq;
 	struct device_node *isp1301_node;

 	if (pdev->dev.of_node) {
 		isp1301_node = of_parse_phandle(pdev->dev.of_node,
 						"transceiver", 0);
 	} else {
 		isp1301_node = NULL;
 	}

 	isp1301_i2c_client = isp1301_get_client(isp1301_node);
 	if (!isp1301_i2c_client) {
 		ret = -EPROBE_DEFER;
 		goto out;
 	}

 	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 	pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;

 	dev_dbg(&pdev->dev, "%s: " DRIVER_DESC " (nxp)\n", hcd_name);
 	if (usb_disabled()) {
 		dev_err(&pdev->dev, "USB is disabled\n");
 		ret = -ENODEV;
 		goto out;
 	}

 	/* Enable AHB slave USB clock, needed for further USB clock control */
 	__raw_writel(USB_SLAVE_HCLK_EN | PAD_CONTROL_LAST_DRIVEN, USB_CTRL);

 	/* Enable USB PLL */
 	usb_pll_clk = clk_get(&pdev->dev, "ck_pll5");
 	if (IS_ERR(usb_pll_clk)) {
 		dev_err(&pdev->dev, "failed to acquire USB PLL\n");
 		ret = PTR_ERR(usb_pll_clk);
 		goto out1;
 	}

 	ret = clk_enable(usb_pll_clk);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to start USB PLL\n");
 		goto out2;
 	}

 	ret = clk_set_rate(usb_pll_clk, 48000);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to set USB clock rate\n");
 		goto out3;
 	}

 	/* Enable USB device clock */
 	usb_dev_clk = clk_get(&pdev->dev, "ck_usbd");
 	if (IS_ERR(usb_dev_clk)) {
 		dev_err(&pdev->dev, "failed to acquire USB DEV Clock\n");
 		ret = PTR_ERR(usb_dev_clk);
 		goto out4;
 	}

 	ret = clk_enable(usb_dev_clk);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to start USB DEV Clock\n");
 		goto out5;
 	}

 	/* Enable USB otg clocks */
 	usb_otg_clk = clk_get(&pdev->dev, "ck_usb_otg");
 	if (IS_ERR(usb_otg_clk)) {
 		dev_err(&pdev->dev, "failed to acquire USB DEV Clock\n");
 		ret = PTR_ERR(usb_dev_clk);
 		goto out6;
 	}

 	__raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);

 	ret = clk_enable(usb_otg_clk);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to start USB DEV Clock\n");
 		goto out7;
 	}

 	isp1301_configure();

 	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 	if (!hcd) {
 		dev_err(&pdev->dev, "Failed to allocate HC buffer\n");
 		ret = -ENOMEM;
 		goto out8;
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(&pdev->dev, "Failed to get MEM resource\n");
 		ret =  -ENOMEM;
 		goto out8;
 	}

 	hcd->regs = devm_request_and_ioremap(&pdev->dev, res);
 	if (!hcd->regs) {
 		dev_err(&pdev->dev, "Failed to devm_request_and_ioremap\n");
 		ret =  -ENOMEM;
 		goto out8;
 	}
 	hcd->rsrc_start = res->start;
 	hcd->rsrc_len = resource_size(res);

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		ret = -ENXIO;
 		goto out8;
 	}

 	nxp_start_hc();
 	platform_set_drvdata(pdev, hcd);
 	ohci = hcd_to_ohci(hcd);
 	ohci_hcd_init(ohci);

 	dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
 	ret = usb_add_hcd(hcd, irq, 0);
 	if (ret == 0)
 		return ret;

 	nxp_stop_hc();
 out8:
 	usb_put_hcd(hcd);
 out7:
 	clk_disable(usb_otg_clk);
 out6:
 	clk_put(usb_otg_clk);
 out5:
 	clk_disable(usb_dev_clk);
 out4:
 	clk_put(usb_dev_clk);
 out3:
 	clk_disable(usb_pll_clk);
 out2:
 	clk_put(usb_pll_clk);
 out1:
 	isp1301_i2c_client = NULL;
 out:
 	return ret;
 }

 static int usb_hcd_nxp_remove(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd = platform_get_drvdata(pdev);

 	usb_remove_hcd(hcd);
 	nxp_stop_hc();
 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 	usb_put_hcd(hcd);
 	clk_disable(usb_pll_clk);
 	clk_put(usb_pll_clk);
 	clk_disable(usb_dev_clk);
 	clk_put(usb_dev_clk);
 	i2c_unregister_device(isp1301_i2c_client);
 	isp1301_i2c_client = NULL;

 	platform_set_drvdata(pdev, NULL);

 	return 0;
 }

 /* work with hotplug and coldplug */
 MODULE_ALIAS("platform:usb-ohci");

 #ifdef CONFIG_OF
 static const struct of_device_id usb_hcd_nxp_match[] = {
 	{ .compatible = "nxp,ohci-nxp" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, usb_hcd_nxp_match);
 #endif

 static struct platform_driver usb_hcd_nxp_driver = {
 	.driver = {
 		.name = "usb-ohci",
 		.owner	= THIS_MODULE,
 		.of_match_table = of_match_ptr(usb_hcd_nxp_match),
 	},
 	.probe = usb_hcd_nxp_probe,
 	.remove = usb_hcd_nxp_remove,
 };
	/*
	* driver for NXP USB Host devices
	*
	* Currently supported OHCI host devices:
	* - NXP LPC32xx
	*
	* Authors: Dmitry Chigirev <source@mvista.com>
	* Vitaly Wool <vitalywool@gmail.com>
	*
	* register initialization is based on code examples provided by Philips
	* Copyright (c) 2005 Koninklijke Philips Electronics N.V.
	*
	* NOTE: This driver does not have suspend/resume functionality
	* This driver is intended for engineering development purposes only
	*
	* 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
	* the terms of the GNU General Public License version 2. This program
	* is licensed "as is" without any warranty of any kind, whether express
	* or implied.
	*/
	#include <linux/clk.h>
	#include <linux/platform_device.h>
	#include <linux/i2c.h>
	#include <linux/of.h>
	#include <linux/usb/isp1301.h>

	#include <mach/hardware.h>
	#include <asm/mach-types.h>
	#include <asm/io.h>

	#include <mach/platform.h>
	#include <mach/irqs.h>

	#define USB_CONFIG_BASE 0x31020000
	#define PWRMAN_BASE 0x40004000

	#define USB_CTRL IO_ADDRESS(PWRMAN_BASE + 0x64)

	/* USB_CTRL bit defines */
	#define USB_SLAVE_HCLK_EN (1 << 24)
	#define USB_DEV_NEED_CLK_EN (1 << 22)
	#define USB_HOST_NEED_CLK_EN (1 << 21)
	#define PAD_CONTROL_LAST_DRIVEN (1 << 19)

	#define USB_OTG_STAT_CONTROL IO_ADDRESS(USB_CONFIG_BASE + 0x110)

	/* USB_OTG_STAT_CONTROL bit defines */
	#define TRANSPARENT_I2C_EN (1 << 7)
	#define HOST_EN (1 << 0)

	/* On LPC32xx, those are undefined */
	#ifndef start_int_set_falling_edge
	#define start_int_set_falling_edge(irq)
	#define start_int_set_rising_edge(irq)
	#define start_int_ack(irq)
	#define start_int_mask(irq)
	#define start_int_umask(irq)
	#endif

	static struct i2c_client *isp1301_i2c_client;

	extern int usb_disabled(void);

	static struct clk *usb_pll_clk;
	static struct clk *usb_dev_clk;
	static struct clk *usb_otg_clk;

	static void isp1301_configure_lpc32xx(void)
	{
	/* LPC32XX only supports DAT_SE0 USB mode */
	/* This sequence is important */

	/* Disable transparent UART mode first */
	i2c_smbus_write_byte_data(isp1301_i2c_client,
	(ISP1301_I2C_MODE_CONTROL_1 \| ISP1301_I2C_REG_CLEAR_ADDR),
	MC1_UART_EN);
	i2c_smbus_write_byte_data(isp1301_i2c_client,
	(ISP1301_I2C_MODE_CONTROL_1 \| ISP1301_I2C_REG_CLEAR_ADDR),
	~MC1_SPEED_REG);
	i2c_smbus_write_byte_data(isp1301_i2c_client,
	ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
	i2c_smbus_write_byte_data(isp1301_i2c_client,
	(ISP1301_I2C_MODE_CONTROL_2 \| ISP1301_I2C_REG_CLEAR_ADDR),
	~0);
	i2c_smbus_write_byte_data(isp1301_i2c_client,
	ISP1301_I2C_MODE_CONTROL_2,
	(MC2_BI_DI \| MC2_PSW_EN \| MC2_SPD_SUSP_CTRL));
	i2c_smbus_write_byte_data(isp1301_i2c_client,
	(ISP1301_I2C_OTG_CONTROL_1 \| ISP1301_I2C_REG_CLEAR_ADDR), ~0);
	i2c_smbus_write_byte_data(isp1301_i2c_client,
	ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
	i2c_smbus_write_byte_data(isp1301_i2c_client,
	ISP1301_I2C_OTG_CONTROL_1,
	(OTG1_DM_PULLDOWN \| OTG1_DP_PULLDOWN));
	i2c_smbus_write_byte_data(isp1301_i2c_client,
	(ISP1301_I2C_OTG_CONTROL_1 \| ISP1301_I2C_REG_CLEAR_ADDR),
	(OTG1_DM_PULLUP \| OTG1_DP_PULLUP));
	i2c_smbus_write_byte_data(isp1301_i2c_client,
	ISP1301_I2C_INTERRUPT_LATCH \| ISP1301_I2C_REG_CLEAR_ADDR, ~0);
	i2c_smbus_write_byte_data(isp1301_i2c_client,
	ISP1301_I2C_INTERRUPT_FALLING \| ISP1301_I2C_REG_CLEAR_ADDR,
	~0);
	i2c_smbus_write_byte_data(isp1301_i2c_client,
	ISP1301_I2C_INTERRUPT_RISING \| ISP1301_I2C_REG_CLEAR_ADDR, ~0);

	/* Enable usb_need_clk clock after transceiver is initialized */
	__raw_writel(__raw_readl(USB_CTRL) \| USB_HOST_NEED_CLK_EN, USB_CTRL);

	printk(KERN_INFO "ISP1301 Vendor ID : 0x%04x\n",
	i2c_smbus_read_word_data(isp1301_i2c_client, 0x00));
	printk(KERN_INFO "ISP1301 Product ID : 0x%04x\n",
	i2c_smbus_read_word_data(isp1301_i2c_client, 0x02));
	printk(KERN_INFO "ISP1301 Version ID : 0x%04x\n",
	i2c_smbus_read_word_data(isp1301_i2c_client, 0x14));
	}

	static void isp1301_configure(void)
	{
	isp1301_configure_lpc32xx();
	}

	static inline void isp1301_vbus_on(void)
	{
	i2c_smbus_write_byte_data(isp1301_i2c_client, ISP1301_I2C_OTG_CONTROL_1,
	OTG1_VBUS_DRV);
	}

	static inline void isp1301_vbus_off(void)
	{
	i2c_smbus_write_byte_data(isp1301_i2c_client,
	ISP1301_I2C_OTG_CONTROL_1 \| ISP1301_I2C_REG_CLEAR_ADDR,
	OTG1_VBUS_DRV);
	}

	static void nxp_start_hc(void)
	{
	unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) \| HOST_EN;
	__raw_writel(tmp, USB_OTG_STAT_CONTROL);
	isp1301_vbus_on();
	}

	static void nxp_stop_hc(void)
	{
	unsigned long tmp;
	isp1301_vbus_off();
	tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN;
	__raw_writel(tmp, USB_OTG_STAT_CONTROL);
	}

	static int __devinit ohci_nxp_start(struct usb_hcd *hcd)
	{
	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
	int ret;

	if ((ret = ohci_init(ohci)) < 0)
	return ret;

	if ((ret = ohci_run(ohci)) < 0) {
	dev_err(hcd->self.controller, "can't start\n");
	ohci_stop(hcd);
	return ret;
	}
	return 0;
	}

	static const struct hc_driver ohci_nxp_hc_driver = {
	.description = hcd_name,
	.product_desc = "nxp OHCI",

	/*
	* generic hardware linkage
	*/
	.irq = ohci_irq,
	.flags = HCD_USB11 \| HCD_MEMORY,

	.hcd_priv_size = sizeof(struct ohci_hcd),
	/*
	* basic lifecycle operations
	*/
	.start = ohci_nxp_start,
	.stop = ohci_stop,
	.shutdown = ohci_shutdown,

	/*
	* managing i/o requests and associated device resources
	*/
	.urb_enqueue = ohci_urb_enqueue,
	.urb_dequeue = ohci_urb_dequeue,
	.endpoint_disable = ohci_endpoint_disable,

	/*
	* scheduling support
	*/
	.get_frame_number = ohci_get_frame,

	/*
	* root hub support
	*/
	.hub_status_data = ohci_hub_status_data,
	.hub_control = ohci_hub_control,
	#ifdef CONFIG_PM
	.bus_suspend = ohci_bus_suspend,
	.bus_resume = ohci_bus_resume,
	#endif
	.start_port_reset = ohci_start_port_reset,
	};

	static int __devinit usb_hcd_nxp_probe(struct platform_device *pdev)
	{
	struct usb_hcd *hcd = 0;
	struct ohci_hcd *ohci;
	const struct hc_driver *driver = &ohci_nxp_hc_driver;
	struct resource *res;
	int ret = 0, irq;
	struct device_node *isp1301_node;

	if (pdev->dev.of_node) {
	isp1301_node = of_parse_phandle(pdev->dev.of_node,
	"transceiver", 0);
	} else {
	isp1301_node = NULL;
	}

	isp1301_i2c_client = isp1301_get_client(isp1301_node);
	if (!isp1301_i2c_client) {
	ret = -EPROBE_DEFER;
	goto out;
	}

	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
	pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;

	dev_dbg(&pdev->dev, "%s: " DRIVER_DESC " (nxp)\n", hcd_name);
	if (usb_disabled()) {
	dev_err(&pdev->dev, "USB is disabled\n");
	ret = -ENODEV;
	goto out;
	}

	/* Enable AHB slave USB clock, needed for further USB clock control */
	__raw_writel(USB_SLAVE_HCLK_EN \| PAD_CONTROL_LAST_DRIVEN, USB_CTRL);

	/* Enable USB PLL */
	usb_pll_clk = clk_get(&pdev->dev, "ck_pll5");
	if (IS_ERR(usb_pll_clk)) {
	dev_err(&pdev->dev, "failed to acquire USB PLL\n");
	ret = PTR_ERR(usb_pll_clk);
	goto out1;
	}

	ret = clk_enable(usb_pll_clk);
	if (ret < 0) {
	dev_err(&pdev->dev, "failed to start USB PLL\n");
	goto out2;
	}

	ret = clk_set_rate(usb_pll_clk, 48000);
	if (ret < 0) {
	dev_err(&pdev->dev, "failed to set USB clock rate\n");
	goto out3;
	}

	/* Enable USB device clock */
	usb_dev_clk = clk_get(&pdev->dev, "ck_usbd");
	if (IS_ERR(usb_dev_clk)) {
	dev_err(&pdev->dev, "failed to acquire USB DEV Clock\n");
	ret = PTR_ERR(usb_dev_clk);
	goto out4;
	}

	ret = clk_enable(usb_dev_clk);
	if (ret < 0) {
	dev_err(&pdev->dev, "failed to start USB DEV Clock\n");
	goto out5;
	}

	/* Enable USB otg clocks */
	usb_otg_clk = clk_get(&pdev->dev, "ck_usb_otg");
	if (IS_ERR(usb_otg_clk)) {
	dev_err(&pdev->dev, "failed to acquire USB DEV Clock\n");
	ret = PTR_ERR(usb_dev_clk);
	goto out6;
	}

	__raw_writel(__raw_readl(USB_CTRL) \| USB_HOST_NEED_CLK_EN, USB_CTRL);

	ret = clk_enable(usb_otg_clk);
	if (ret < 0) {
	dev_err(&pdev->dev, "failed to start USB DEV Clock\n");
	goto out7;
	}

	isp1301_configure();

	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
	if (!hcd) {
	dev_err(&pdev->dev, "Failed to allocate HC buffer\n");
	ret = -ENOMEM;
	goto out8;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
	dev_err(&pdev->dev, "Failed to get MEM resource\n");
	ret = -ENOMEM;
	goto out8;
	}

	hcd->regs = devm_request_and_ioremap(&pdev->dev, res);
	if (!hcd->regs) {
	dev_err(&pdev->dev, "Failed to devm_request_and_ioremap\n");
	ret = -ENOMEM;
	goto out8;
	}
	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
	ret = -ENXIO;
	goto out8;
	}

	nxp_start_hc();
	platform_set_drvdata(pdev, hcd);
	ohci = hcd_to_ohci(hcd);
	ohci_hcd_init(ohci);

	dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
	ret = usb_add_hcd(hcd, irq, 0);
	if (ret == 0)
	return ret;

	nxp_stop_hc();
	out8:
	usb_put_hcd(hcd);
	out7:
	clk_disable(usb_otg_clk);
	out6:
	clk_put(usb_otg_clk);
	out5:
	clk_disable(usb_dev_clk);
	out4:
	clk_put(usb_dev_clk);
	out3:
	clk_disable(usb_pll_clk);
	out2:
	clk_put(usb_pll_clk);
	out1:
	isp1301_i2c_client = NULL;
	out:
	return ret;
	}

	static int usb_hcd_nxp_remove(struct platform_device *pdev)
	{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	usb_remove_hcd(hcd);
	nxp_stop_hc();
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);
	clk_disable(usb_pll_clk);
	clk_put(usb_pll_clk);
	clk_disable(usb_dev_clk);
	clk_put(usb_dev_clk);
	i2c_unregister_device(isp1301_i2c_client);
	isp1301_i2c_client = NULL;

	platform_set_drvdata(pdev, NULL);

	return 0;
	}

	/* work with hotplug and coldplug */
	MODULE_ALIAS("platform:usb-ohci");

	#ifdef CONFIG_OF
	static const struct of_device_id usb_hcd_nxp_match[] = {
	{ .compatible = "nxp,ohci-nxp" },
	{},
	};
	MODULE_DEVICE_TABLE(of, usb_hcd_nxp_match);
	#endif

	static struct platform_driver usb_hcd_nxp_driver = {
	.driver = {
	.name = "usb-ohci",
	.owner = THIS_MODULE,
	.of_match_table = of_match_ptr(usb_hcd_nxp_match),
	},
	.probe = usb_hcd_nxp_probe,
	.remove = usb_hcd_nxp_remove,
	};