drivers/usb/host/ehci-omap.c

/*
 * (C) Copyright 2011 Ilya Yanok, Emcraft Systems
 * (C) Copyright 2004-2008
 * Texas Instruments, <www.ti.com>
 *
 * Derived from Beagle Board code by
 *	Sunil Kumar <sunilsaini05@gmail.com>
 *	Shashi Ranjan <shashiranjanmca05@gmail.com>
 *
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <usb.h>
#include <usb/ulpi.h>
#include <errno.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <asm/arch/ehci.h>
#include <asm/ehci-omap.h>

#include "ehci.h"

static struct omap_uhh *const uhh = (struct omap_uhh *)OMAP_UHH_BASE;
static struct omap_usbtll *const usbtll = (struct omap_usbtll *)OMAP_USBTLL_BASE;
static struct omap_ehci *const ehci = (struct omap_ehci *)OMAP_EHCI_BASE;

static int omap_uhh_reset(void)
{
/*
 * Soft resetting the UHH module causes instability issues on
 * all OMAPs so we just avoid it.
 *
 * See OMAP36xx Errata
 *  i571: USB host EHCI may stall when entering smart-standby mode
 *  i660: USBHOST Configured In Smart-Idle Can Lead To a Deadlock
 *
 * On OMAP4/5, soft-resetting the UHH module will put it into
 * Smart-Idle mode and lead to a deadlock.
 *
 * On OMAP3, this doesn't seem to be the case but still instabilities
 * are observed on beagle (3530 ES1.0) if soft-reset is used.
 * e.g. NFS root failures with Linux kernel.
 */
	return 0;
}

static int omap_ehci_tll_reset(void)
{
	unsigned long init = get_timer(0);

	/* perform TLL soft reset, and wait until reset is complete */
	writel(OMAP_USBTLL_SYSCONFIG_SOFTRESET, &usbtll->sysc);

	/* Wait for TLL reset to complete */
	while (!(readl(&usbtll->syss) & OMAP_USBTLL_SYSSTATUS_RESETDONE))
		if (get_timer(init) > CONFIG_SYS_HZ) {
			debug("OMAP EHCI error: timeout resetting TLL\n");
			return -EL3RST;
	}

	return 0;
}

static void omap_usbhs_hsic_init(int port)
{
	unsigned int reg;

	/* Enable channels now */
	reg = readl(&usbtll->channel_conf + port);

	setbits_le32(&reg, (OMAP_TLL_CHANNEL_CONF_CHANMODE_TRANSPARENT_UTMI
		| OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF
		| OMAP_TLL_CHANNEL_CONF_DRVVBUS
		| OMAP_TLL_CHANNEL_CONF_CHRGVBUS
		| OMAP_TLL_CHANNEL_CONF_CHANEN));

	writel(reg, &usbtll->channel_conf + port);
}

#ifdef CONFIG_USB_ULPI
static void omap_ehci_soft_phy_reset(int port)
{
	struct ulpi_viewport ulpi_vp;

	ulpi_vp.viewport_addr = (u32)&ehci->insreg05_utmi_ulpi;
	ulpi_vp.port_num = port;

	ulpi_reset(&ulpi_vp);
}
#else
static void omap_ehci_soft_phy_reset(int port)
{
	return;
}
#endif

#if defined(CONFIG_OMAP_EHCI_PHY1_RESET_GPIO) || \
	defined(CONFIG_OMAP_EHCI_PHY2_RESET_GPIO) || \
	defined(CONFIG_OMAP_EHCI_PHY3_RESET_GPIO)
/* controls PHY(s) reset signal(s) */
static inline void omap_ehci_phy_reset(int on, int delay)
{
	/*
	 * Refer ISSUE1:
	 * Hold the PHY in RESET for enough time till
	 * PHY is settled and ready
	 */
	if (delay && !on)
		udelay(delay);
#ifdef CONFIG_OMAP_EHCI_PHY1_RESET_GPIO
	gpio_request(CONFIG_OMAP_EHCI_PHY1_RESET_GPIO, "USB PHY1 reset");
	gpio_direction_output(CONFIG_OMAP_EHCI_PHY1_RESET_GPIO, !on);
#endif
#ifdef CONFIG_OMAP_EHCI_PHY2_RESET_GPIO
	gpio_request(CONFIG_OMAP_EHCI_PHY2_RESET_GPIO, "USB PHY2 reset");
	gpio_direction_output(CONFIG_OMAP_EHCI_PHY2_RESET_GPIO, !on);
#endif
#ifdef CONFIG_OMAP_EHCI_PHY3_RESET_GPIO
	gpio_request(CONFIG_OMAP_EHCI_PHY3_RESET_GPIO, "USB PHY3 reset");
	gpio_direction_output(CONFIG_OMAP_EHCI_PHY3_RESET_GPIO, !on);
#endif

	/* Hold the PHY in RESET for enough time till DIR is high */
	/* Refer: ISSUE1 */
	if (delay && on)
		udelay(delay);
}
#else
#define omap_ehci_phy_reset(on, delay)	do {} while (0)
#endif

/* Reset is needed otherwise the kernel-driver will throw an error. */
int omap_ehci_hcd_stop(void)
{
	debug("Resetting OMAP EHCI\n");
	omap_ehci_phy_reset(1, 0);

	if (omap_uhh_reset() < 0)
		return -1;

	if (omap_ehci_tll_reset() < 0)
		return -1;

	return 0;
}

/*
 * Initialize the OMAP EHCI controller and PHY.
 * Based on "drivers/usb/host/ehci-omap.c" from Linux 3.1
 * See there for additional Copyrights.
 */
int omap_ehci_hcd_init(int index, struct omap_usbhs_board_data *usbhs_pdata,
		       struct ehci_hccr **hccr, struct ehci_hcor **hcor)
{
	int ret;
	unsigned int i, reg = 0, rev = 0;

	debug("Initializing OMAP EHCI\n");

	ret = board_usb_init(index, USB_INIT_HOST);
	if (ret < 0)
		return ret;

	/* Put the PHY in RESET */
	omap_ehci_phy_reset(1, 10);

	ret = omap_uhh_reset();
	if (ret < 0)
		return ret;

	ret = omap_ehci_tll_reset();
	if (ret)
		return ret;

	writel(OMAP_USBTLL_SYSCONFIG_ENAWAKEUP |
		OMAP_USBTLL_SYSCONFIG_SIDLEMODE |
		OMAP_USBTLL_SYSCONFIG_CACTIVITY, &usbtll->sysc);

	/* Put UHH in NoIdle/NoStandby mode */
	writel(OMAP_UHH_SYSCONFIG_VAL, &uhh->sysc);

	/* setup ULPI bypass and burst configurations */
	clrsetbits_le32(&reg, OMAP_UHH_HOSTCONFIG_INCRX_ALIGN_EN,
		(OMAP_UHH_HOSTCONFIG_INCR4_BURST_EN |
		OMAP_UHH_HOSTCONFIG_INCR8_BURST_EN |
		OMAP_UHH_HOSTCONFIG_INCR16_BURST_EN));

	rev = readl(&uhh->rev);
	if (rev == OMAP_USBHS_REV1) {
		if (is_ehci_phy_mode(usbhs_pdata->port_mode[0]))
			clrbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P1_BYPASS);
		else
			setbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P1_BYPASS);

		if (is_ehci_phy_mode(usbhs_pdata->port_mode[1]))
			clrbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P2_BYPASS);
		else
			setbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P2_BYPASS);

		if (is_ehci_phy_mode(usbhs_pdata->port_mode[2]))
			clrbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P3_BYPASS);
		else
			setbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P3_BYPASS);
	} else if (rev == OMAP_USBHS_REV2) {

		clrsetbits_le32(&reg, (OMAP_P1_MODE_CLEAR | OMAP_P2_MODE_CLEAR),
					OMAP4_UHH_HOSTCONFIG_APP_START_CLK);

		/* Clear port mode fields for PHY mode */

		if (is_ehci_hsic_mode(usbhs_pdata->port_mode[0]))
			setbits_le32(&reg, OMAP_P1_MODE_HSIC);

		if (is_ehci_hsic_mode(usbhs_pdata->port_mode[1]))
			setbits_le32(&reg, OMAP_P2_MODE_HSIC);

	} else if (rev == OMAP_USBHS_REV2_1) {

		clrsetbits_le32(&reg,
				(OMAP_P1_MODE_CLEAR |
				 OMAP_P2_MODE_CLEAR |
				 OMAP_P3_MODE_CLEAR),
				OMAP4_UHH_HOSTCONFIG_APP_START_CLK);

		/* Clear port mode fields for PHY mode */

		if (is_ehci_hsic_mode(usbhs_pdata->port_mode[0]))
			setbits_le32(&reg, OMAP_P1_MODE_HSIC);

		if (is_ehci_hsic_mode(usbhs_pdata->port_mode[1]))
			setbits_le32(&reg, OMAP_P2_MODE_HSIC);

		if (is_ehci_hsic_mode(usbhs_pdata->port_mode[2]))
			setbits_le32(&reg, OMAP_P3_MODE_HSIC);
	}

	debug("OMAP UHH_REVISION 0x%x\n", rev);
	writel(reg, &uhh->hostconfig);

	for (i = 0; i < OMAP_HS_USB_PORTS; i++)
		if (is_ehci_hsic_mode(usbhs_pdata->port_mode[i]))
			omap_usbhs_hsic_init(i);

	omap_ehci_phy_reset(0, 10);

	/*
	 * An undocumented "feature" in the OMAP3 EHCI controller,
	 * causes suspended ports to be taken out of suspend when
	 * the USBCMD.Run/Stop bit is cleared (for example when
	 * we do ehci_bus_suspend).
	 * This breaks suspend-resume if the root-hub is allowed
	 * to suspend. Writing 1 to this undocumented register bit
	 * disables this feature and restores normal behavior.
	 */
	writel(EHCI_INSNREG04_DISABLE_UNSUSPEND, &ehci->insreg04);

	for (i = 0; i < OMAP_HS_USB_PORTS; i++)
		if (is_ehci_phy_mode(usbhs_pdata->port_mode[i]))
			omap_ehci_soft_phy_reset(i);

	*hccr = (struct ehci_hccr *)(OMAP_EHCI_BASE);
	*hcor = (struct ehci_hcor *)(OMAP_EHCI_BASE + 0x10);

	debug("OMAP EHCI init done\n");
	return 0;
}