u-boot/drivers/usb/host/ehci-mpc512x.c

/*
 * (C) Copyright 2010, Damien Dusha, <d.dusha@gmail.com>
 *
 * (C) Copyright 2009, Value Team S.p.A.
 * Francesco Rendine, <francesco.rendine@valueteam.com>
 *
 * (C) Copyright 2009 Freescale Semiconductor, Inc.
 *
 * (C) Copyright 2008, Excito Elektronik i Sk=E5ne AB
 *
 * Author: Tor Krill tor@excito.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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <pci.h>
#include <usb.h>
#include <asm/io.h>
#include <usb/ehci-fsl.h>

#include "ehci.h"
#include "ehci-core.h"

static void fsl_setup_phy(volatile struct ehci_hcor *);
static void fsl_platform_set_host_mode(volatile struct usb_ehci *ehci);
static int reset_usb_controller(volatile struct usb_ehci *ehci);
static void usb_platform_dr_init(volatile struct usb_ehci *ehci);

/*
 * Initialize SOC FSL EHCI Controller
 *
 * This code is derived from EHCI FSL USB Linux driver for MPC5121
 *
 */
int ehci_hcd_init(void)
{
	volatile struct usb_ehci *ehci;

	/* Hook the memory mapped registers for EHCI-Controller */
	ehci = (struct usb_ehci *)CONFIG_SYS_FSL_USB_ADDR;
	hccr = (struct ehci_hccr *)((uint32_t)&(ehci->caplength));
	hcor = (struct ehci_hcor *)((uint32_t) hccr +
				HC_LENGTH(ehci_readl(&hccr->cr_capbase)));

	/* configure interface for UTMI_WIDE */
	usb_platform_dr_init(ehci);

	/* Init Phy USB0 to UTMI+ */
	fsl_setup_phy(hcor);

	/* Set to host mode */
	fsl_platform_set_host_mode(ehci);

	/*
	 * Setting the burst size seems to be required to prevent the
	 * USB from hanging when communicating with certain USB Mass
	 * storage devices. This was determined by analysing the
	 * EHCI registers under Linux vs U-Boot and burstsize was the
	 * major non-interrupt related difference between the two
	 * implementations.
	 *
	 * Some USB sticks behave better than others. In particular,
	 * the following USB stick is especially problematic:
	 * 0930:6545 Toshiba Corp
	 *
	 * The burstsize is set here to match the Linux implementation.
	 */
	out_be32(&ehci->burstsize, FSL_EHCI_TXPBURST(8) |
				   FSL_EHCI_RXPBURST(8));

	return 0;
}

/*
 * Destroy the appropriate control structures corresponding
 * the the EHCI host controller.
 */
int ehci_hcd_stop(void)
{
	volatile struct usb_ehci *ehci;
	int exit_status = 0;

	if (hcor) {
		/* Unhook struct */
		hccr = NULL;
		hcor = NULL;

		/* Reset the USB controller */
		ehci = (struct usb_ehci *)CONFIG_SYS_FSL_USB_ADDR;
		exit_status = reset_usb_controller(ehci);
	}

	return exit_status;
}

static int reset_usb_controller(volatile struct usb_ehci *ehci)
{
	unsigned int i;

	/* Command a reset of the USB Controller */
	out_be32(&(ehci->usbcmd), EHCI_FSL_USBCMD_RST);

	/* Wait for the reset process to finish */
	for (i = 65535 ; i > 0 ; i--) {
		/*
		 * The host will set this bit to zero once the
		 * reset process is complete
		 */
		if ((in_be32(&(ehci->usbcmd)) & EHCI_FSL_USBCMD_RST) == 0)
			return 0;
	}

	/* Hub did not reset in time */
	return -1;
}

static void fsl_setup_phy(volatile struct ehci_hcor *hcor)
{
	uint32_t portsc;

	portsc  = ehci_readl(&hcor->or_portsc[0]);
	portsc &= ~(PORT_PTS_MSK | PORT_PTS_PTW);

	/* Enable the phy mode to UTMI Wide */
	portsc |= PORT_PTS_PTW;
	portsc |= PORT_PTS_UTMI;

	ehci_writel(&hcor->or_portsc[0], portsc);
}

static void fsl_platform_set_host_mode(volatile struct usb_ehci *ehci)
{
	uint32_t temp;

	temp  = in_le32(&ehci->usbmode);
	temp |= CM_HOST | ES_BE;
	out_le32(&ehci->usbmode, temp);
}

static void usb_platform_dr_init(volatile struct usb_ehci *ehci)
{
	/* Configure interface for UTMI_WIDE */
	out_be32(&ehci->isiphyctrl, PHYCTRL_PHYE | PHYCTRL_PXE);
	out_be32(&ehci->usbgenctrl, GC_PPP | GC_PFP );
}