u-boot/drivers/usb/host/ehci-s5p.c

/*
 * SAMSUNG S5P USB HOST EHCI Controller
 *
 * Copyright (C) 2012 Samsung Electronics Co.Ltd
 *	Vivek Gautam <gautam.vivek@samsung.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301 USA
 */

#include <common.h>
#include <usb.h>
#include <asm/arch/cpu.h>
#include <asm/arch/ehci-s5p.h>
#include "ehci.h"
#include "ehci-core.h"

/* Setup the EHCI host controller. */
static void setup_usb_phy(struct s5p_usb_phy *usb)
{
	clrbits_le32(&usb->usbphyctrl0,
			HOST_CTRL0_FSEL_MASK |
			HOST_CTRL0_COMMONON_N |
			/* HOST Phy setting */
			HOST_CTRL0_PHYSWRST |
			HOST_CTRL0_PHYSWRSTALL |
			HOST_CTRL0_SIDDQ |
			HOST_CTRL0_FORCESUSPEND |
			HOST_CTRL0_FORCESLEEP);

	setbits_le32(&usb->usbphyctrl0,
			/* Setting up the ref freq */
			(CLK_24MHZ << 16) |
			/* HOST Phy setting */
			HOST_CTRL0_LINKSWRST |
			HOST_CTRL0_UTMISWRST);
	udelay(10);
	clrbits_le32(&usb->usbphyctrl0,
			HOST_CTRL0_LINKSWRST |
			HOST_CTRL0_UTMISWRST);
	udelay(20);

	/* EHCI Ctrl setting */
	setbits_le32(&usb->ehcictrl,
			EHCICTRL_ENAINCRXALIGN |
			EHCICTRL_ENAINCR4 |
			EHCICTRL_ENAINCR8 |
			EHCICTRL_ENAINCR16);
}

/* Reset the EHCI host controller. */
static void reset_usb_phy(struct s5p_usb_phy *usb)
{
	/* HOST_PHY reset */
	setbits_le32(&usb->usbphyctrl0,
			HOST_CTRL0_PHYSWRST |
			HOST_CTRL0_PHYSWRSTALL |
			HOST_CTRL0_SIDDQ |
			HOST_CTRL0_FORCESUSPEND |
			HOST_CTRL0_FORCESLEEP);
}

/*
 * EHCI-initialization
 * Create the appropriate control structures to manage
 * a new EHCI host controller.
 */
int ehci_hcd_init(void)
{
	struct s5p_usb_phy *usb;

	usb = (struct s5p_usb_phy *)samsung_get_base_usb_phy();
	setup_usb_phy(usb);

	hccr = (struct ehci_hccr *)(EXYNOS5_USB_HOST_EHCI_BASE);
	hcor = (struct ehci_hcor *)((uint32_t) hccr
				+ HC_LENGTH(ehci_readl(&hccr->cr_capbase)));

	debug("Exynos5-ehci: init hccr %x and hcor %x hc_length %d\n",
		(uint32_t)hccr, (uint32_t)hcor,
		(uint32_t)HC_LENGTH(ehci_readl(&hccr->cr_capbase)));

	return 0;
}

/*
 * Destroy the appropriate control structures corresponding
 * the EHCI host controller.
 */
int ehci_hcd_stop()
{
	struct s5p_usb_phy *usb;

	usb = (struct s5p_usb_phy *)samsung_get_base_usb_phy();
	reset_usb_phy(usb);

	return 0;
}