drivers/usb/musb/blackfin.c - kernel/omap - Git at Google

 /*
  * MUSB OTG controller driver for Blackfin Processors
  *
  * Copyright 2006-2008 Analog Devices Inc.
  *
  * Enter bugs at http://blackfin.uclinux.org/
  *
  * Licensed under the GPL-2 or later.
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/gpio.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>

 #include <asm/cacheflush.h>

 #include "musb_core.h"
 #include "blackfin.h"

 struct bfin_glue {
 	struct device		*dev;
 	struct platform_device	*musb;
 };
 #define glue_to_musb(g)		platform_get_drvdata(g->musb)

 /*
  * Load an endpoint's FIFO
  */
 void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
 {
 	void __iomem *fifo = hw_ep->fifo;
 	void __iomem *epio = hw_ep->regs;
 	u8 epnum = hw_ep->epnum;

 	prefetch((u8 *)src);

 	musb_writew(epio, MUSB_TXCOUNT, len);

 	DBG(4, "TX ep%d fifo %p count %d buf %p, epio %p\n",
 			hw_ep->epnum, fifo, len, src, epio);

 	dump_fifo_data(src, len);

 	if (!ANOMALY_05000380 && epnum != 0) {
 		u16 dma_reg;

 		flush_dcache_range((unsigned long)src,
 			(unsigned long)(src + len));

 		/* Setup DMA address register */
 		dma_reg = (u32)src;
 		bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg);
 		SSYNC();

 		dma_reg = (u32)src >> 16;
 		bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_HIGH), dma_reg);
 		SSYNC();

 		/* Setup DMA count register */
 		bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_LOW), len);
 		bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_HIGH), 0);
 		SSYNC();

 		/* Enable the DMA */
 		dma_reg = (epnum << 4) | DMA_ENA | INT_ENA | DIRECTION;
 		bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), dma_reg);
 		SSYNC();

 		/* Wait for compelete */
 		while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum)))
 			cpu_relax();

 		/* acknowledge dma interrupt */
 		bfin_write_USB_DMA_INTERRUPT(1 << epnum);
 		SSYNC();

 		/* Reset DMA */
 		bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), 0);
 		SSYNC();
 	} else {
 		SSYNC();

 		if (unlikely((unsigned long)src & 0x01))
 			outsw_8((unsigned long)fifo, src, (len + 1) >> 1);
 		else
 			outsw((unsigned long)fifo, src, (len + 1) >> 1);
 	}
 }
 /*
  * Unload an endpoint's FIFO
  */
 void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
 {
 	void __iomem *fifo = hw_ep->fifo;
 	u8 epnum = hw_ep->epnum;

 	if (ANOMALY_05000467 && epnum != 0) {
 		u16 dma_reg;

 		invalidate_dcache_range((unsigned long)dst,
 			(unsigned long)(dst + len));

 		/* Setup DMA address register */
 		dma_reg = (u32)dst;
 		bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg);
 		SSYNC();

 		dma_reg = (u32)dst >> 16;
 		bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_HIGH), dma_reg);
 		SSYNC();

 		/* Setup DMA count register */
 		bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_LOW), len);
 		bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_HIGH), 0);
 		SSYNC();

 		/* Enable the DMA */
 		dma_reg = (epnum << 4) | DMA_ENA | INT_ENA;
 		bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), dma_reg);
 		SSYNC();

 		/* Wait for compelete */
 		while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum)))
 			cpu_relax();

 		/* acknowledge dma interrupt */
 		bfin_write_USB_DMA_INTERRUPT(1 << epnum);
 		SSYNC();

 		/* Reset DMA */
 		bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), 0);
 		SSYNC();
 	} else {
 		SSYNC();
 		/* Read the last byte of packet with odd size from address fifo + 4
 		 * to trigger 1 byte access to EP0 FIFO.
 		 */
 		if (len == 1)
 			*dst = (u8)inw((unsigned long)fifo + 4);
 		else {
 			if (unlikely((unsigned long)dst & 0x01))
 				insw_8((unsigned long)fifo, dst, len >> 1);
 			else
 				insw((unsigned long)fifo, dst, len >> 1);

 			if (len & 0x01)
 				*(dst + len - 1) = (u8)inw((unsigned long)fifo + 4);
 		}
 	}
 	DBG(4, "%cX ep%d fifo %p count %d buf %p\n",
 			'R', hw_ep->epnum, fifo, len, dst);

 	dump_fifo_data(dst, len);
 }

 static irqreturn_t blackfin_interrupt(int irq, void *__hci)
 {
 	unsigned long	flags;
 	irqreturn_t	retval = IRQ_NONE;
 	struct musb	*musb = __hci;

 	spin_lock_irqsave(&musb->lock, flags);

 	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
 	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
 	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);

 	if (musb->int_usb || musb->int_tx || musb->int_rx) {
 		musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb);
 		musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx);
 		musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx);
 		retval = musb_interrupt(musb);
 	}

 	/* Start sampling ID pin, when plug is removed from MUSB */
 	if ((is_otg_enabled(musb) && (musb->xceiv->state == OTG_STATE_B_IDLE
 		|| musb->xceiv->state == OTG_STATE_A_WAIT_BCON)) ||
 		(musb->int_usb & MUSB_INTR_DISCONNECT && is_host_active(musb))) {
 		mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
 		musb->a_wait_bcon = TIMER_DELAY;
 	}

 	spin_unlock_irqrestore(&musb->lock, flags);

 	return retval;
 }

 static void musb_conn_timer_handler(unsigned long _musb)
 {
 	struct musb *musb = (void *)_musb;
 	unsigned long flags;
 	u16 val;
 	static u8 toggle;

 	spin_lock_irqsave(&musb->lock, flags);
 	switch (musb->xceiv->state) {
 	case OTG_STATE_A_IDLE:
 	case OTG_STATE_A_WAIT_BCON:
 		/* Start a new session */
 		val = musb_readw(musb->mregs, MUSB_DEVCTL);
 		val &= ~MUSB_DEVCTL_SESSION;
 		musb_writew(musb->mregs, MUSB_DEVCTL, val);
 		val |= MUSB_DEVCTL_SESSION;
 		musb_writew(musb->mregs, MUSB_DEVCTL, val);
 		/* Check if musb is host or peripheral. */
 		val = musb_readw(musb->mregs, MUSB_DEVCTL);

 		if (!(val & MUSB_DEVCTL_BDEVICE)) {
 			gpio_set_value(musb->config->gpio_vrsel, 1);
 			musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
 		} else {
 			gpio_set_value(musb->config->gpio_vrsel, 0);
 			/* Ignore VBUSERROR and SUSPEND IRQ */
 			val = musb_readb(musb->mregs, MUSB_INTRUSBE);
 			val &= ~MUSB_INTR_VBUSERROR;
 			musb_writeb(musb->mregs, MUSB_INTRUSBE, val);

 			val = MUSB_INTR_SUSPEND | MUSB_INTR_VBUSERROR;
 			musb_writeb(musb->mregs, MUSB_INTRUSB, val);
 			if (is_otg_enabled(musb))
 				musb->xceiv->state = OTG_STATE_B_IDLE;
 			else
 				musb_writeb(musb->mregs, MUSB_POWER, MUSB_POWER_HSENAB);
 		}
 		mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
 		break;
 	case OTG_STATE_B_IDLE:

 		if (!is_peripheral_enabled(musb))
 			break;
 		/* Start a new session.  It seems that MUSB needs taking
 		 * some time to recognize the type of the plug inserted?
 		 */
 		val = musb_readw(musb->mregs, MUSB_DEVCTL);
 		val |= MUSB_DEVCTL_SESSION;
 		musb_writew(musb->mregs, MUSB_DEVCTL, val);
 		val = musb_readw(musb->mregs, MUSB_DEVCTL);

 		if (!(val & MUSB_DEVCTL_BDEVICE)) {
 			gpio_set_value(musb->config->gpio_vrsel, 1);
 			musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
 		} else {
 			gpio_set_value(musb->config->gpio_vrsel, 0);

 			/* Ignore VBUSERROR and SUSPEND IRQ */
 			val = musb_readb(musb->mregs, MUSB_INTRUSBE);
 			val &= ~MUSB_INTR_VBUSERROR;
 			musb_writeb(musb->mregs, MUSB_INTRUSBE, val);

 			val = MUSB_INTR_SUSPEND | MUSB_INTR_VBUSERROR;
 			musb_writeb(musb->mregs, MUSB_INTRUSB, val);

 			/* Toggle the Soft Conn bit, so that we can response to
 			 * the inserting of either A-plug or B-plug.
 			 */
 			if (toggle) {
 				val = musb_readb(musb->mregs, MUSB_POWER);
 				val &= ~MUSB_POWER_SOFTCONN;
 				musb_writeb(musb->mregs, MUSB_POWER, val);
 				toggle = 0;
 			} else {
 				val = musb_readb(musb->mregs, MUSB_POWER);
 				val |= MUSB_POWER_SOFTCONN;
 				musb_writeb(musb->mregs, MUSB_POWER, val);
 				toggle = 1;
 			}
 			/* The delay time is set to 1/4 second by default,
 			 * shortening it, if accelerating A-plug detection
 			 * is needed in OTG mode.
 			 */
 			mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY / 4);
 		}
 		break;
 	default:
 		DBG(1, "%s state not handled\n", otg_state_string(musb));
 		break;
 	}
 	spin_unlock_irqrestore(&musb->lock, flags);

 	DBG(4, "state is %s\n", otg_state_string(musb));
 }

 static void bfin_musb_enable(struct musb *musb)
 {
 	if (!is_otg_enabled(musb) && is_host_enabled(musb)) {
 		mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
 		musb->a_wait_bcon = TIMER_DELAY;
 	}
 }

 static void bfin_musb_disable(struct musb *musb)
 {
 }

 static void bfin_musb_set_vbus(struct musb *musb, int is_on)
 {
 	int value = musb->config->gpio_vrsel_active;
 	if (!is_on)
 		value = !value;
 	gpio_set_value(musb->config->gpio_vrsel, value);

 	DBG(1, "VBUS %s, devctl %02x "
 		/* otg %3x conf %08x prcm %08x */ "\n",
 		otg_state_string(musb),
 		musb_readb(musb->mregs, MUSB_DEVCTL));
 }

 static int bfin_musb_set_power(struct otg_transceiver *x, unsigned mA)
 {
 	return 0;
 }

 static void bfin_musb_try_idle(struct musb *musb, unsigned long timeout)
 {
 	if (!is_otg_enabled(musb) && is_host_enabled(musb))
 		mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
 }

 static int bfin_musb_get_vbus_status(struct musb *musb)
 {
 	return 0;
 }

 static int bfin_musb_set_mode(struct musb *musb, u8 musb_mode)
 {
 	return -EIO;
 }

 static void bfin_musb_reg_init(struct musb *musb)
 {
 	if (ANOMALY_05000346) {
 		bfin_write_USB_APHY_CALIB(ANOMALY_05000346_value);
 		SSYNC();
 	}

 	if (ANOMALY_05000347) {
 		bfin_write_USB_APHY_CNTRL(0x0);
 		SSYNC();
 	}

 	/* Configure PLL oscillator register */
 	bfin_write_USB_PLLOSC_CTRL(0x3080 |
 			((480/musb->config->clkin) << 1));
 	SSYNC();

 	bfin_write_USB_SRP_CLKDIV((get_sclk()/1000) / 32 - 1);
 	SSYNC();

 	bfin_write_USB_EP_NI0_RXMAXP(64);
 	SSYNC();

 	bfin_write_USB_EP_NI0_TXMAXP(64);
 	SSYNC();

 	/* Route INTRUSB/INTR_RX/INTR_TX to USB_INT0*/
 	bfin_write_USB_GLOBINTR(0x7);
 	SSYNC();

 	bfin_write_USB_GLOBAL_CTL(GLOBAL_ENA | EP1_TX_ENA | EP2_TX_ENA |
 				EP3_TX_ENA | EP4_TX_ENA | EP5_TX_ENA |
 				EP6_TX_ENA | EP7_TX_ENA | EP1_RX_ENA |
 				EP2_RX_ENA | EP3_RX_ENA | EP4_RX_ENA |
 				EP5_RX_ENA | EP6_RX_ENA | EP7_RX_ENA);
 	SSYNC();
 }

 static int bfin_musb_init(struct musb *musb)
 {

 	/*
 	 * Rev 1.0 BF549 EZ-KITs require PE7 to be high for both DEVICE
 	 * and OTG HOST modes, while rev 1.1 and greater require PE7 to
 	 * be low for DEVICE mode and high for HOST mode. We set it high
 	 * here because we are in host mode
 	 */

 	if (gpio_request(musb->config->gpio_vrsel, "USB_VRSEL")) {
 		printk(KERN_ERR "Failed ro request USB_VRSEL GPIO_%d\n",
 			musb->config->gpio_vrsel);
 		return -ENODEV;
 	}
 	gpio_direction_output(musb->config->gpio_vrsel, 0);

 	usb_nop_xceiv_register();
 	musb->xceiv = otg_get_transceiver();
 	if (!musb->xceiv) {
 		gpio_free(musb->config->gpio_vrsel);
 		return -ENODEV;
 	}

 	bfin_musb_reg_init(musb);

 	if (is_host_enabled(musb)) {
 		setup_timer(&musb_conn_timer,
 			musb_conn_timer_handler, (unsigned long) musb);
 	}
 	if (is_peripheral_enabled(musb))
 		musb->xceiv->set_power = bfin_musb_set_power;

 	musb->isr = blackfin_interrupt;

 	return 0;
 }

 static int bfin_musb_exit(struct musb *musb)
 {
 	gpio_free(musb->config->gpio_vrsel);

 	otg_put_transceiver(musb->xceiv);
 	usb_nop_xceiv_unregister();
 	return 0;
 }

 static const struct musb_platform_ops bfin_ops = {
 	.init		= bfin_musb_init,
 	.exit		= bfin_musb_exit,

 	.enable		= bfin_musb_enable,
 	.disable	= bfin_musb_disable,

 	.set_mode	= bfin_musb_set_mode,
 	.try_idle	= bfin_musb_try_idle,

 	.vbus_status	= bfin_musb_vbus_status,
 	.set_vbus	= bfin_musb_set_vbus,
 };

 static u64 bfin_dmamask = DMA_BIT_MASK(32);

 static int __init bfin_probe(struct platform_device *pdev)
 {
 	struct musb_hdrc_platform_data	*pdata = pdev->dev.platform_data;
 	struct platform_device		*musb;
 	struct bfin_glue		*glue;

 	int				ret = -ENOMEM;

 	glue = kzalloc(sizeof(*glue), GFP_KERNEL);
 	if (!glue) {
 		dev_err(&pdev->dev, "failed to allocate glue context\n");
 		goto err0;
 	}

 	musb = platform_device_alloc("musb-hdrc", -1);
 	if (!musb) {
 		dev_err(&pdev->dev, "failed to allocate musb device\n");
 		goto err1;
 	}

 	musb->dev.parent		= &pdev->dev;
 	musb->dev.dma_mask		= &bfin_dmamask;
 	musb->dev.coherent_dma_mask	= bfin_dmamask;

 	glue->dev			= &pdev->dev;
 	glue->musb			= musb;

 	pdata->platform_ops		= &bfin_ops;

 	platform_set_drvdata(pdev, glue);

 	ret = platform_device_add_resources(musb, pdev->resource,
 			pdev->num_resources);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to add resources\n");
 		goto err2;
 	}

 	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 	if (ret) {
 		dev_err(&pdev->dev, "failed to add platform_data\n");
 		goto err2;
 	}

 	ret = platform_device_add(musb);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register musb device\n");
 		goto err2;
 	}

 	return 0;

 err2:
 	platform_device_put(musb);

 err1:
 	kfree(glue);

 err0:
 	return ret;
 }

 static int __exit bfin_remove(struct platform_device *pdev)
 {
 	struct bfin_glue		*glue = platform_get_drvdata(pdev);

 	platform_device_del(glue->musb);
 	platform_device_put(glue->musb);
 	kfree(glue);

 	return 0;
 }

 #ifdef CONFIG_PM
 static int bfin_suspend(struct device *dev)
 {
 	struct bfin_glue	*glue = dev_get_drvdata(dev);
 	struct musb		*musb = glue_to_musb(glue);

 	if (is_host_active(musb))
 		/*
 		 * During hibernate gpio_vrsel will change from high to low
 		 * low which will generate wakeup event resume the system
 		 * immediately.  Set it to 0 before hibernate to avoid this
 		 * wakeup event.
 		 */
 		gpio_set_value(musb->config->gpio_vrsel, 0);

 	return 0;
 }

 static int bfin_resume(struct device *dev)
 {
 	struct bfin_glue	*glue = dev_get_drvdata(dev);
 	struct musb		*musb = glue_to_musb(glue);

 	bfin_musb_reg_init(musb);

 	return 0;
 }

 static struct dev_pm_ops bfin_pm_ops = {
 	.suspend	= bfin_suspend,
 	.resume		= bfin_resume,
 };

 #define DEV_PM_OPS	&bfin_pm_op,
 #else
 #define DEV_PM_OPS	NULL
 #endif

 static struct platform_driver bfin_driver = {
 	.remove		= __exit_p(bfin_remove),
 	.driver		= {
 		.name	= "musb-bfin",
 		.pm	= DEV_PM_OPS,
 	},
 };

 MODULE_DESCRIPTION("Blackfin MUSB Glue Layer");
 MODULE_AUTHOR("Bryan Wy <[email protected]>");
 MODULE_LICENSE("GPL v2");

 static int __init bfin_init(void)
 {
 	return platform_driver_probe(&bfin_driver, bfin_probe);
 }
 subsys_initcall(bfin_init);

 static void __exit bfin_exit(void)
 {
 	platform_driver_unregister(&bfin_driver);
 }
 module_exit(bfin_exit);
	/*
	* MUSB OTG controller driver for Blackfin Processors
	*
	* Copyright 2006-2008 Analog Devices Inc.
	*
	* Enter bugs at http://blackfin.uclinux.org/
	*
	* Licensed under the GPL-2 or later.
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/sched.h>
	#include <linux/init.h>
	#include <linux/list.h>
	#include <linux/gpio.h>
	#include <linux/io.h>
	#include <linux/platform_device.h>
	#include <linux/dma-mapping.h>

	#include <asm/cacheflush.h>

	#include "musb_core.h"
	#include "blackfin.h"

	struct bfin_glue {
	struct device *dev;
	struct platform_device *musb;
	};
	#define glue_to_musb(g) platform_get_drvdata(g->musb)

	/*
	* Load an endpoint's FIFO
	*/
	void musb_write_fifo(struct musb_hw_ep hw_ep, u16 len, const u8 src)
	{
	void __iomem *fifo = hw_ep->fifo;
	void __iomem *epio = hw_ep->regs;
	u8 epnum = hw_ep->epnum;

	prefetch((u8 *)src);

	musb_writew(epio, MUSB_TXCOUNT, len);

	DBG(4, "TX ep%d fifo %p count %d buf %p, epio %p\n",
	hw_ep->epnum, fifo, len, src, epio);

	dump_fifo_data(src, len);

	if (!ANOMALY_05000380 && epnum != 0) {
	u16 dma_reg;

	flush_dcache_range((unsigned long)src,
	(unsigned long)(src + len));

	/* Setup DMA address register */
	dma_reg = (u32)src;
	bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg);
	SSYNC();

	dma_reg = (u32)src >> 16;
	bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_HIGH), dma_reg);
	SSYNC();

	/* Setup DMA count register */
	bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_LOW), len);
	bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_HIGH), 0);
	SSYNC();

	/* Enable the DMA */
	dma_reg = (epnum << 4) \| DMA_ENA \| INT_ENA \| DIRECTION;
	bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), dma_reg);
	SSYNC();

	/* Wait for compelete */
	while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum)))
	cpu_relax();

	/* acknowledge dma interrupt */
	bfin_write_USB_DMA_INTERRUPT(1 << epnum);
	SSYNC();

	/* Reset DMA */
	bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), 0);
	SSYNC();
	} else {
	SSYNC();

	if (unlikely((unsigned long)src & 0x01))
	outsw_8((unsigned long)fifo, src, (len + 1) >> 1);
	else
	outsw((unsigned long)fifo, src, (len + 1) >> 1);
	}
	}
	/*
	* Unload an endpoint's FIFO
	*/
	void musb_read_fifo(struct musb_hw_ep hw_ep, u16 len, u8 dst)
	{
	void __iomem *fifo = hw_ep->fifo;
	u8 epnum = hw_ep->epnum;

	if (ANOMALY_05000467 && epnum != 0) {
	u16 dma_reg;

	invalidate_dcache_range((unsigned long)dst,
	(unsigned long)(dst + len));

	/* Setup DMA address register */
	dma_reg = (u32)dst;
	bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg);
	SSYNC();

	dma_reg = (u32)dst >> 16;
	bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_HIGH), dma_reg);
	SSYNC();

	/* Setup DMA count register */
	bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_LOW), len);
	bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_HIGH), 0);
	SSYNC();

	/* Enable the DMA */
	dma_reg = (epnum << 4) \| DMA_ENA \| INT_ENA;
	bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), dma_reg);
	SSYNC();

	/* Wait for compelete */
	while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum)))
	cpu_relax();

	/* acknowledge dma interrupt */
	bfin_write_USB_DMA_INTERRUPT(1 << epnum);
	SSYNC();

	/* Reset DMA */
	bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), 0);
	SSYNC();
	} else {
	SSYNC();
	/* Read the last byte of packet with odd size from address fifo + 4
	* to trigger 1 byte access to EP0 FIFO.
	*/
	if (len == 1)
	*dst = (u8)inw((unsigned long)fifo + 4);
	else {
	if (unlikely((unsigned long)dst & 0x01))
	insw_8((unsigned long)fifo, dst, len >> 1);
	else
	insw((unsigned long)fifo, dst, len >> 1);

	if (len & 0x01)
	*(dst + len - 1) = (u8)inw((unsigned long)fifo + 4);
	}
	}
	DBG(4, "%cX ep%d fifo %p count %d buf %p\n",
	'R', hw_ep->epnum, fifo, len, dst);

	dump_fifo_data(dst, len);
	}

	static irqreturn_t blackfin_interrupt(int irq, void *__hci)
	{
	unsigned long flags;
	irqreturn_t retval = IRQ_NONE;
	struct musb *musb = __hci;

	spin_lock_irqsave(&musb->lock, flags);

	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);

	if (musb->int_usb \|\| musb->int_tx \|\| musb->int_rx) {
	musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb);
	musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx);
	musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx);
	retval = musb_interrupt(musb);
	}

	/* Start sampling ID pin, when plug is removed from MUSB */
	if ((is_otg_enabled(musb) && (musb->xceiv->state == OTG_STATE_B_IDLE
	\|\| musb->xceiv->state == OTG_STATE_A_WAIT_BCON)) \|\|
	(musb->int_usb & MUSB_INTR_DISCONNECT && is_host_active(musb))) {
	mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
	musb->a_wait_bcon = TIMER_DELAY;
	}

	spin_unlock_irqrestore(&musb->lock, flags);

	return retval;
	}

	static void musb_conn_timer_handler(unsigned long _musb)
	{
	struct musb musb = (void )_musb;
	unsigned long flags;
	u16 val;
	static u8 toggle;

	spin_lock_irqsave(&musb->lock, flags);
	switch (musb->xceiv->state) {
	case OTG_STATE_A_IDLE:
	case OTG_STATE_A_WAIT_BCON:
	/* Start a new session */
	val = musb_readw(musb->mregs, MUSB_DEVCTL);
	val &= ~MUSB_DEVCTL_SESSION;
	musb_writew(musb->mregs, MUSB_DEVCTL, val);
	val \|= MUSB_DEVCTL_SESSION;
	musb_writew(musb->mregs, MUSB_DEVCTL, val);
	/* Check if musb is host or peripheral. */
	val = musb_readw(musb->mregs, MUSB_DEVCTL);

	if (!(val & MUSB_DEVCTL_BDEVICE)) {
	gpio_set_value(musb->config->gpio_vrsel, 1);
	musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
	} else {
	gpio_set_value(musb->config->gpio_vrsel, 0);
	/* Ignore VBUSERROR and SUSPEND IRQ */
	val = musb_readb(musb->mregs, MUSB_INTRUSBE);
	val &= ~MUSB_INTR_VBUSERROR;
	musb_writeb(musb->mregs, MUSB_INTRUSBE, val);

	val = MUSB_INTR_SUSPEND \| MUSB_INTR_VBUSERROR;
	musb_writeb(musb->mregs, MUSB_INTRUSB, val);
	if (is_otg_enabled(musb))
	musb->xceiv->state = OTG_STATE_B_IDLE;
	else
	musb_writeb(musb->mregs, MUSB_POWER, MUSB_POWER_HSENAB);
	}
	mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
	break;
	case OTG_STATE_B_IDLE:

	if (!is_peripheral_enabled(musb))
	break;
	/* Start a new session. It seems that MUSB needs taking
	* some time to recognize the type of the plug inserted?
	*/
	val = musb_readw(musb->mregs, MUSB_DEVCTL);
	val \|= MUSB_DEVCTL_SESSION;
	musb_writew(musb->mregs, MUSB_DEVCTL, val);
	val = musb_readw(musb->mregs, MUSB_DEVCTL);

	if (!(val & MUSB_DEVCTL_BDEVICE)) {
	gpio_set_value(musb->config->gpio_vrsel, 1);
	musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
	} else {
	gpio_set_value(musb->config->gpio_vrsel, 0);

	/* Ignore VBUSERROR and SUSPEND IRQ */
	val = musb_readb(musb->mregs, MUSB_INTRUSBE);
	val &= ~MUSB_INTR_VBUSERROR;
	musb_writeb(musb->mregs, MUSB_INTRUSBE, val);

	val = MUSB_INTR_SUSPEND \| MUSB_INTR_VBUSERROR;
	musb_writeb(musb->mregs, MUSB_INTRUSB, val);

	/* Toggle the Soft Conn bit, so that we can response to
	* the inserting of either A-plug or B-plug.
	*/
	if (toggle) {
	val = musb_readb(musb->mregs, MUSB_POWER);
	val &= ~MUSB_POWER_SOFTCONN;
	musb_writeb(musb->mregs, MUSB_POWER, val);
	toggle = 0;
	} else {
	val = musb_readb(musb->mregs, MUSB_POWER);
	val \|= MUSB_POWER_SOFTCONN;
	musb_writeb(musb->mregs, MUSB_POWER, val);
	toggle = 1;
	}
	/* The delay time is set to 1/4 second by default,
	* shortening it, if accelerating A-plug detection
	* is needed in OTG mode.
	*/
	mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY / 4);
	}
	break;
	default:
	DBG(1, "%s state not handled\n", otg_state_string(musb));
	break;
	}
	spin_unlock_irqrestore(&musb->lock, flags);

	DBG(4, "state is %s\n", otg_state_string(musb));
	}

	static void bfin_musb_enable(struct musb *musb)
	{
	if (!is_otg_enabled(musb) && is_host_enabled(musb)) {
	mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
	musb->a_wait_bcon = TIMER_DELAY;
	}
	}

	static void bfin_musb_disable(struct musb *musb)
	{
	}

	static void bfin_musb_set_vbus(struct musb *musb, int is_on)
	{
	int value = musb->config->gpio_vrsel_active;
	if (!is_on)
	value = !value;
	gpio_set_value(musb->config->gpio_vrsel, value);

	DBG(1, "VBUS %s, devctl %02x "
	/* otg %3x conf %08x prcm %08x */ "\n",
	otg_state_string(musb),
	musb_readb(musb->mregs, MUSB_DEVCTL));
	}

	static int bfin_musb_set_power(struct otg_transceiver *x, unsigned mA)
	{
	return 0;
	}

	static void bfin_musb_try_idle(struct musb *musb, unsigned long timeout)
	{
	if (!is_otg_enabled(musb) && is_host_enabled(musb))
	mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
	}

	static int bfin_musb_get_vbus_status(struct musb *musb)
	{
	return 0;
	}

	static int bfin_musb_set_mode(struct musb *musb, u8 musb_mode)
	{
	return -EIO;
	}

	static void bfin_musb_reg_init(struct musb *musb)
	{
	if (ANOMALY_05000346) {
	bfin_write_USB_APHY_CALIB(ANOMALY_05000346_value);
	SSYNC();
	}

	if (ANOMALY_05000347) {
	bfin_write_USB_APHY_CNTRL(0x0);
	SSYNC();
	}

	/* Configure PLL oscillator register */
	bfin_write_USB_PLLOSC_CTRL(0x3080 \|
	((480/musb->config->clkin) << 1));
	SSYNC();

	bfin_write_USB_SRP_CLKDIV((get_sclk()/1000) / 32 - 1);
	SSYNC();

	bfin_write_USB_EP_NI0_RXMAXP(64);
	SSYNC();

	bfin_write_USB_EP_NI0_TXMAXP(64);
	SSYNC();

	/* Route INTRUSB/INTR_RX/INTR_TX to USB_INT0*/
	bfin_write_USB_GLOBINTR(0x7);
	SSYNC();

	bfin_write_USB_GLOBAL_CTL(GLOBAL_ENA \| EP1_TX_ENA \| EP2_TX_ENA \|
	EP3_TX_ENA \| EP4_TX_ENA \| EP5_TX_ENA \|
	EP6_TX_ENA \| EP7_TX_ENA \| EP1_RX_ENA \|
	EP2_RX_ENA \| EP3_RX_ENA \| EP4_RX_ENA \|
	EP5_RX_ENA \| EP6_RX_ENA \| EP7_RX_ENA);
	SSYNC();
	}

	static int bfin_musb_init(struct musb *musb)
	{

	/*
	* Rev 1.0 BF549 EZ-KITs require PE7 to be high for both DEVICE
	* and OTG HOST modes, while rev 1.1 and greater require PE7 to
	* be low for DEVICE mode and high for HOST mode. We set it high
	* here because we are in host mode
	*/

	if (gpio_request(musb->config->gpio_vrsel, "USB_VRSEL")) {
	printk(KERN_ERR "Failed ro request USB_VRSEL GPIO_%d\n",
	musb->config->gpio_vrsel);
	return -ENODEV;
	}
	gpio_direction_output(musb->config->gpio_vrsel, 0);

	usb_nop_xceiv_register();
	musb->xceiv = otg_get_transceiver();
	if (!musb->xceiv) {
	gpio_free(musb->config->gpio_vrsel);
	return -ENODEV;
	}

	bfin_musb_reg_init(musb);

	if (is_host_enabled(musb)) {
	setup_timer(&musb_conn_timer,
	musb_conn_timer_handler, (unsigned long) musb);
	}
	if (is_peripheral_enabled(musb))
	musb->xceiv->set_power = bfin_musb_set_power;

	musb->isr = blackfin_interrupt;

	return 0;
	}

	static int bfin_musb_exit(struct musb *musb)
	{
	gpio_free(musb->config->gpio_vrsel);

	otg_put_transceiver(musb->xceiv);
	usb_nop_xceiv_unregister();
	return 0;
	}

	static const struct musb_platform_ops bfin_ops = {
	.init = bfin_musb_init,
	.exit = bfin_musb_exit,

	.enable = bfin_musb_enable,
	.disable = bfin_musb_disable,

	.set_mode = bfin_musb_set_mode,
	.try_idle = bfin_musb_try_idle,

	.vbus_status = bfin_musb_vbus_status,
	.set_vbus = bfin_musb_set_vbus,
	};

	static u64 bfin_dmamask = DMA_BIT_MASK(32);

	static int __init bfin_probe(struct platform_device *pdev)
	{
	struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data;
	struct platform_device *musb;
	struct bfin_glue *glue;

	int ret = -ENOMEM;

	glue = kzalloc(sizeof(*glue), GFP_KERNEL);
	if (!glue) {
	dev_err(&pdev->dev, "failed to allocate glue context\n");
	goto err0;
	}

	musb = platform_device_alloc("musb-hdrc", -1);
	if (!musb) {
	dev_err(&pdev->dev, "failed to allocate musb device\n");
	goto err1;
	}

	musb->dev.parent = &pdev->dev;
	musb->dev.dma_mask = &bfin_dmamask;
	musb->dev.coherent_dma_mask = bfin_dmamask;

	glue->dev = &pdev->dev;
	glue->musb = musb;

	pdata->platform_ops = &bfin_ops;

	platform_set_drvdata(pdev, glue);

	ret = platform_device_add_resources(musb, pdev->resource,
	pdev->num_resources);
	if (ret) {
	dev_err(&pdev->dev, "failed to add resources\n");
	goto err2;
	}

	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
	if (ret) {
	dev_err(&pdev->dev, "failed to add platform_data\n");
	goto err2;
	}

	ret = platform_device_add(musb);
	if (ret) {
	dev_err(&pdev->dev, "failed to register musb device\n");
	goto err2;
	}

	return 0;

	err2:
	platform_device_put(musb);

	err1:
	kfree(glue);

	err0:
	return ret;
	}

	static int __exit bfin_remove(struct platform_device *pdev)
	{
	struct bfin_glue *glue = platform_get_drvdata(pdev);

	platform_device_del(glue->musb);
	platform_device_put(glue->musb);
	kfree(glue);

	return 0;
	}

	#ifdef CONFIG_PM
	static int bfin_suspend(struct device *dev)
	{
	struct bfin_glue *glue = dev_get_drvdata(dev);
	struct musb *musb = glue_to_musb(glue);

	if (is_host_active(musb))
	/*
	* During hibernate gpio_vrsel will change from high to low
	* low which will generate wakeup event resume the system
	* immediately. Set it to 0 before hibernate to avoid this
	* wakeup event.
	*/
	gpio_set_value(musb->config->gpio_vrsel, 0);

	return 0;
	}

	static int bfin_resume(struct device *dev)
	{
	struct bfin_glue *glue = dev_get_drvdata(dev);
	struct musb *musb = glue_to_musb(glue);

	bfin_musb_reg_init(musb);

	return 0;
	}

	static struct dev_pm_ops bfin_pm_ops = {
	.suspend = bfin_suspend,
	.resume = bfin_resume,
	};

	#define DEV_PM_OPS &bfin_pm_op,
	#else
	#define DEV_PM_OPS NULL
	#endif

	static struct platform_driver bfin_driver = {
	.remove = __exit_p(bfin_remove),
	.driver = {
	.name = "musb-bfin",
	.pm = DEV_PM_OPS,
	},
	};

	MODULE_DESCRIPTION("Blackfin MUSB Glue Layer");
	MODULE_AUTHOR("Bryan Wy <[email protected]>");
	MODULE_LICENSE("GPL v2");

	static int __init bfin_init(void)
	{
	return platform_driver_probe(&bfin_driver, bfin_probe);
	}
	subsys_initcall(bfin_init);

	static void __exit bfin_exit(void)
	{
	platform_driver_unregister(&bfin_driver);
	}
	module_exit(bfin_exit);