drivers/usb/musb/blackfin.c - kernel/msm-4.19 - Gitiles

 /*
  * 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/slab.h>
 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/clk.h>
 #include <linux/gpio.h>
 #include <linux/io.h>

 #include <asm/cacheflush.h>

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

 /*
  * 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;

 	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 (unlikely((unsigned long)src & 0x01))
 		outsw_8(fifo, src, len & 0x01 ? (len >> 1) + 1 : len >> 1);
 	else
 		outsw(fifo, src, len & 0x01 ? (len >> 1) + 1 : len >> 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;
 	u16 dma_reg = 0;
 	int i;
 	u16 *data;

 	DBG(4, "%cX ep%d fifo %p count %d buf %p\n",
 			'R', hw_ep->epnum, fifo, len, dst);

 #ifdef CONFIG_BF52x
 	invalidate_dcache_range((unsigned int)dst,
 		(unsigned int)(dst + len));

 	/* Setup DMA address register */
 	dma_reg = (u16) ((u32) dst & 0xFFFF);
 	bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg);
 	SSYNC();

 	dma_reg = (u16) (((u32) dst >> 16) & 0xFFFF);
 	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
 	if (unlikely((unsigned long)dst & 0x01))
 		insw_8(fifo, dst, len & 0x01 ? (len >> 1) + 1 : len >> 1);
 	else
 		insw(fifo, dst, len & 0x01 ? (len >> 1) + 1 : len >> 1);
 #endif

 	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);
 	}

 	spin_unlock_irqrestore(&musb->lock, flags);

 	/* REVISIT we sometimes get spurious IRQs on g_ep0
 	 * not clear why... fall in BF54x too.
 	 */
 	if (retval != IRQ_HANDLED)
 		DBG(5, "spurious?\n");

 	return IRQ_HANDLED;
 }

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

 	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_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);

 			val = MUSB_POWER_HSENAB;
 			musb_writeb(musb->mregs, MUSB_POWER, val);
 		}
 		mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
 		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));
 }

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

 void musb_platform_disable(struct musb *musb)
 {
 }

 static void bfin_vbus_power(struct musb *musb, int is_on, int sleeping)
 {
 }

 static void bfin_set_vbus(struct musb *musb, int is_on)
 {
 	if (is_on)
 		gpio_set_value(musb->config->gpio_vrsel, 1);
 	else
 		gpio_set_value(musb->config->gpio_vrsel, 0);

 	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_set_power(struct otg_transceiver *x, unsigned mA)
 {
 	return 0;
 }

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

 int musb_platform_get_vbus_status(struct musb *musb)
 {
 	return 0;
 }

 void musb_platform_set_mode(struct musb *musb, u8 musb_mode)
 {
 }

 int __init musb_platform_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);

 	/* Anomaly #05000346 */
 	bfin_write_USB_APHY_CALIB(0x5411);
 	SSYNC();

 	/* Anomaly #05000347 */
 	bfin_write_USB_APHY_CNTRL(0x0);
 	SSYNC();

 	/* TODO
 	 * Set SIC-IVG register
 	 */

 	/* Configure PLL oscillator register */
 	bfin_write_USB_PLLOSC_CTRL(0x30a8);
 	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();

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

 	musb->isr = blackfin_interrupt;

 	return 0;
 }

 int musb_platform_suspend(struct musb *musb)
 {
 	return 0;
 }

 int musb_platform_resume(struct musb *musb)
 {
 	return 0;
 }


 int musb_platform_exit(struct musb *musb)
 {

 	bfin_vbus_power(musb, 0 /*off*/, 1);
 	gpio_free(musb->config->gpio_vrsel);
 	musb_platform_suspend(musb);

 	return 0;
 }
	/*
	* 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/slab.h>
	#include <linux/init.h>
	#include <linux/list.h>
	#include <linux/clk.h>
	#include <linux/gpio.h>
	#include <linux/io.h>

	#include <asm/cacheflush.h>

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

	/*
	* 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;

	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 (unlikely((unsigned long)src & 0x01))
	outsw_8(fifo, src, len & 0x01 ? (len >> 1) + 1 : len >> 1);
	else
	outsw(fifo, src, len & 0x01 ? (len >> 1) + 1 : len >> 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;
	u16 dma_reg = 0;
	int i;
	u16 *data;

	DBG(4, "%cX ep%d fifo %p count %d buf %p\n",
	'R', hw_ep->epnum, fifo, len, dst);

	#ifdef CONFIG_BF52x
	invalidate_dcache_range((unsigned int)dst,
	(unsigned int)(dst + len));

	/* Setup DMA address register */
	dma_reg = (u16) ((u32) dst & 0xFFFF);
	bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg);
	SSYNC();

	dma_reg = (u16) (((u32) dst >> 16) & 0xFFFF);
	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
	if (unlikely((unsigned long)dst & 0x01))
	insw_8(fifo, dst, len & 0x01 ? (len >> 1) + 1 : len >> 1);
	else
	insw(fifo, dst, len & 0x01 ? (len >> 1) + 1 : len >> 1);
	#endif

	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);
	}

	spin_unlock_irqrestore(&musb->lock, flags);

	/* REVISIT we sometimes get spurious IRQs on g_ep0
	* not clear why... fall in BF54x too.
	*/
	if (retval != IRQ_HANDLED)
	DBG(5, "spurious?\n");

	return IRQ_HANDLED;
	}

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

	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_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);

	val = MUSB_POWER_HSENAB;
	musb_writeb(musb->mregs, MUSB_POWER, val);
	}
	mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
	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));
	}

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

	void musb_platform_disable(struct musb *musb)
	{
	}

	static void bfin_vbus_power(struct musb *musb, int is_on, int sleeping)
	{
	}

	static void bfin_set_vbus(struct musb *musb, int is_on)
	{
	if (is_on)
	gpio_set_value(musb->config->gpio_vrsel, 1);
	else
	gpio_set_value(musb->config->gpio_vrsel, 0);

	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_set_power(struct otg_transceiver *x, unsigned mA)
	{
	return 0;
	}

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

	int musb_platform_get_vbus_status(struct musb *musb)
	{
	return 0;
	}

	void musb_platform_set_mode(struct musb *musb, u8 musb_mode)
	{
	}

	int __init musb_platform_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);

	/* Anomaly #05000346 */
	bfin_write_USB_APHY_CALIB(0x5411);
	SSYNC();

	/* Anomaly #05000347 */
	bfin_write_USB_APHY_CNTRL(0x0);
	SSYNC();

	/* TODO
	* Set SIC-IVG register
	*/

	/* Configure PLL oscillator register */
	bfin_write_USB_PLLOSC_CTRL(0x30a8);
	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();

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

	musb->isr = blackfin_interrupt;

	return 0;
	}

	int musb_platform_suspend(struct musb *musb)
	{
	return 0;
	}

	int musb_platform_resume(struct musb *musb)
	{
	return 0;
	}


	int musb_platform_exit(struct musb *musb)
	{

	bfin_vbus_power(musb, 0 /off/, 1);
	gpio_free(musb->config->gpio_vrsel);
	musb_platform_suspend(musb);

	return 0;
	}